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FFmpeg/libavformat/mov.c

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  1. /*

  2.  * MOV demuxer

  3.  * Copyright (c) 2001 Fabrice Bellard

  4.  * Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with FFmpeg; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  */

  22. 

  23. #include <limits.h>

  24. 

  25. //#define DEBUG

  26. //#define MOV_EXPORT_ALL_METADATA

  27. 

  28. #include "libavutil/attributes.h"

  29. #include "libavutil/channel_layout.h"

  30. #include "libavutil/intreadwrite.h"

  31. #include "libavutil/intfloat.h"

  32. #include "libavutil/mathematics.h"

  33. #include "libavutil/avstring.h"

  34. #include "libavutil/dict.h"

  35. #include "libavutil/opt.h"

  36. #include "libavutil/timecode.h"

  37. #include "libavcodec/ac3tab.h"

  38. #include "avformat.h"

  39. #include "internal.h"

  40. #include "avio_internal.h"

  41. #include "riff.h"

  42. #include "isom.h"

  43. #include "libavcodec/get_bits.h"

  44. #include "id3v1.h"

  45. #include "mov_chan.h"

  46. 

  47. #if CONFIG_ZLIB

  48. #include <zlib.h>

  49. #endif

  50. 

  51. /*

  52.  * First version by Francois Revol revol@free.fr

  53.  * Seek function by Gael Chardon gael.dev@4now.net

  54.  */

  55. 

  56. #include "qtpalette.h"

  57. 

  58. 

  59. #undef NDEBUG

  60. #include <assert.h>

  61. 

  62. /* those functions parse an atom */

  63. /* links atom IDs to parse functions */

  64. typedef struct MOVParseTableEntry {

  65.     uint32_t type;

  66.     int (*parse)(MOVContext *ctx, AVIOContext *pb, MOVAtom atom);

  67. } MOVParseTableEntry;

  68. 

  69. static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom);

  70. 

  71. static int mov_metadata_track_or_disc_number(MOVContext *c, AVIOContext *pb,

  72.                                              unsigned len, const char *key)

  73. {

  74.     char buf[16];

  75. 

  76.     short current, total = 0;

  77.     avio_rb16(pb); // unknown

  78.     current = avio_rb16(pb);

  79.     if (len >= 6)

  80.         total = avio_rb16(pb);

  81.     if (!total)

  82.         snprintf(buf, sizeof(buf), "%d", current);

  83.     else

  84.         snprintf(buf, sizeof(buf), "%d/%d", current, total);

  85.     av_dict_set(&c->fc->metadata, key, buf, 0);

  86. 

  87.     return 0;

  88. }

  89. 

  90. static int mov_metadata_int8_bypass_padding(MOVContext *c, AVIOContext *pb,

  91.                                             unsigned len, const char *key)

  92. {

  93.     char buf[16];

  94. 

  95.     /* bypass padding bytes */

  96.     avio_r8(pb);

  97.     avio_r8(pb);

  98.     avio_r8(pb);

  99. 

  100.     snprintf(buf, sizeof(buf), "%d", avio_r8(pb));

  101.     av_dict_set(&c->fc->metadata, key, buf, 0);

  102. 

  103.     return 0;

  104. }

  105. 

  106. static int mov_metadata_int8_no_padding(MOVContext *c, AVIOContext *pb,

  107.                                         unsigned len, const char *key)

  108. {

  109.     char buf[16];

  110. 

  111.     snprintf(buf, sizeof(buf), "%d", avio_r8(pb));

  112.     av_dict_set(&c->fc->metadata, key, buf, 0);

  113. 

  114.     return 0;

  115. }

  116. 

  117. static int mov_metadata_gnre(MOVContext *c, AVIOContext *pb,

  118.                              unsigned len, const char *key)

  119. {

  120.     short genre;

  121.     char buf[20];

  122. 

  123.     avio_r8(pb); // unknown

  124. 

  125.     genre = avio_r8(pb);

  126.     if (genre < 1 || genre > ID3v1_GENRE_MAX)

  127.         return 0;

  128.     snprintf(buf, sizeof(buf), "%s", ff_id3v1_genre_str[genre-1]);

  129.     av_dict_set(&c->fc->metadata, key, buf, 0);

  130. 

  131.     return 0;

  132. }

  133. 

  134. static int mov_read_custom_metadata(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  135. {

  136.     char key[1024]={0}, data[1024]={0};

  137.     int i;

  138.     AVStream *st;

  139.     MOVStreamContext *sc;

  140. 

  141.     if (c->fc->nb_streams < 1)

  142.         return 0;

  143.     st = c->fc->streams[c->fc->nb_streams-1];

  144.     sc = st->priv_data;

  145. 

  146.     if (atom.size <= 8) return 0;

  147. 

  148.     for (i = 0; i < 3; i++) { // Parse up to three sub-atoms looking for name and data.

  149.         int data_size = avio_rb32(pb);

  150.         int tag = avio_rl32(pb);

  151.         int str_size = 0, skip_size = 0;

  152.         char *target = NULL;

  153. 

  154.         switch (tag) {

  155.         case MKTAG('n','a','m','e'):

  156.             avio_rb32(pb); // version/flags

  157.             str_size = skip_size = data_size - 12;

  158.             atom.size -= 12;

  159.             target = key;

  160.             break;

  161.         case MKTAG('d','a','t','a'):

  162.             avio_rb32(pb); // version/flags

  163.             avio_rb32(pb); // reserved (zero)

  164.             str_size = skip_size = data_size - 16;

  165.             atom.size -= 16;

  166.             target = data;

  167.             break;

  168.         default:

  169.             skip_size = data_size - 8;

  170.             str_size = 0;

  171.             break;

  172.         }

  173. 

  174.         if (target) {

  175.             str_size = FFMIN3(sizeof(data)-1, str_size, atom.size);

  176.             avio_read(pb, target, str_size);

  177.             target[str_size] = 0;

  178.         }

  179.         atom.size -= skip_size;

  180. 

  181.         // If we didn't read the full data chunk for the sub-atom, skip to the end of it.

  182.         if (skip_size > str_size) avio_skip(pb, skip_size - str_size);

  183.     }

  184. 

  185.     if (*key && *data) {

  186.         if (strcmp(key, "iTunSMPB") == 0) {

  187.             int priming, remainder, samples;

  188.             if(sscanf(data, "%*X %X %X %X", &priming, &remainder, &samples) == 3){

  189.                 if(priming>0 && priming<16384)

  190.                     sc->start_pad = priming;

  191.                 return 1;

  192.             }

  193.         }

  194.         if (strcmp(key, "cdec") == 0) {

  195. //             av_dict_set(&st->metadata, key, data, 0);

  196.             return 1;

  197.         }

  198.     }

  199.     return 0;

  200. }

  201. 

  202. static const uint32_t mac_to_unicode[128] = {

  203.     0x00C4,0x00C5,0x00C7,0x00C9,0x00D1,0x00D6,0x00DC,0x00E1,

  204.     0x00E0,0x00E2,0x00E4,0x00E3,0x00E5,0x00E7,0x00E9,0x00E8,

  205.     0x00EA,0x00EB,0x00ED,0x00EC,0x00EE,0x00EF,0x00F1,0x00F3,

  206.     0x00F2,0x00F4,0x00F6,0x00F5,0x00FA,0x00F9,0x00FB,0x00FC,

  207.     0x2020,0x00B0,0x00A2,0x00A3,0x00A7,0x2022,0x00B6,0x00DF,

  208.     0x00AE,0x00A9,0x2122,0x00B4,0x00A8,0x2260,0x00C6,0x00D8,

  209.     0x221E,0x00B1,0x2264,0x2265,0x00A5,0x00B5,0x2202,0x2211,

  210.     0x220F,0x03C0,0x222B,0x00AA,0x00BA,0x03A9,0x00E6,0x00F8,

  211.     0x00BF,0x00A1,0x00AC,0x221A,0x0192,0x2248,0x2206,0x00AB,

  212.     0x00BB,0x2026,0x00A0,0x00C0,0x00C3,0x00D5,0x0152,0x0153,

  213.     0x2013,0x2014,0x201C,0x201D,0x2018,0x2019,0x00F7,0x25CA,

  214.     0x00FF,0x0178,0x2044,0x20AC,0x2039,0x203A,0xFB01,0xFB02,

  215.     0x2021,0x00B7,0x201A,0x201E,0x2030,0x00C2,0x00CA,0x00C1,

  216.     0x00CB,0x00C8,0x00CD,0x00CE,0x00CF,0x00CC,0x00D3,0x00D4,

  217.     0xF8FF,0x00D2,0x00DA,0x00DB,0x00D9,0x0131,0x02C6,0x02DC,

  218.     0x00AF,0x02D8,0x02D9,0x02DA,0x00B8,0x02DD,0x02DB,0x02C7,

  219. };

  220. 

  221. static int mov_read_mac_string(MOVContext *c, AVIOContext *pb, int len,

  222.                                char *dst, int dstlen)

  223. {

  224.     char *p = dst;

  225.     char *end = dst+dstlen-1;

  226.     int i;

  227. 

  228.     for (i = 0; i < len; i++) {

  229.         uint8_t t, c = avio_r8(pb);

  230.         if (c < 0x80 && p < end)

  231.             *p++ = c;

  232.         else if (p < end)

  233.             PUT_UTF8(mac_to_unicode[c-0x80], t, if (p < end) *p++ = t;);

  234.     }

  235.     *p = 0;

  236.     return p - dst;

  237. }

  238. 

  239. static int mov_read_covr(MOVContext *c, AVIOContext *pb, int type, int len)

  240. {

  241.     AVPacket pkt;

  242.     AVStream *st;

  243.     MOVStreamContext *sc;

  244.     enum AVCodecID id;

  245.     int ret;

  246. 

  247.     switch (type) {

  248.     case 0xd:  id = AV_CODEC_ID_MJPEG; break;

  249.     case 0xe:  id = AV_CODEC_ID_PNG;   break;

  250.     case 0x1b: id = AV_CODEC_ID_BMP;   break;

  251.     default:

  252.         av_log(c->fc, AV_LOG_WARNING, "Unknown cover type: 0x%x.\n", type);

  253.         avio_skip(pb, len);

  254.         return 0;

  255.     }

  256. 

  257.     st = avformat_new_stream(c->fc, NULL);

  258.     if (!st)

  259.         return AVERROR(ENOMEM);

  260.     sc = av_mallocz(sizeof(*sc));

  261.     if (!sc)

  262.         return AVERROR(ENOMEM);

  263.     st->priv_data = sc;

  264. 

  265.     ret = av_get_packet(pb, &pkt, len);

  266.     if (ret < 0)

  267.         return ret;

  268. 

  269.     st->disposition              |= AV_DISPOSITION_ATTACHED_PIC;

  270. 

  271.     st->attached_pic              = pkt;

  272.     st->attached_pic.stream_index = st->index;

  273.     st->attached_pic.flags       |= AV_PKT_FLAG_KEY;

  274. 

  275.     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

  276.     st->codec->codec_id   = id;

  277. 

  278.     return 0;

  279. }

  280. 

  281. static int mov_read_udta_string(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  282. {

  283. #ifdef MOV_EXPORT_ALL_METADATA

  284.     char tmp_key[5];

  285. #endif

  286.     char str[1024], key2[16], language[4] = {0};

  287.     const char *key = NULL;

  288.     uint16_t langcode = 0;

  289.     uint32_t data_type = 0, str_size;

  290.     int (*parse)(MOVContext*, AVIOContext*, unsigned, const char*) = NULL;

  291. 

  292.     if (c->itunes_metadata && atom.type == MKTAG('-','-','-','-'))

  293.         return mov_read_custom_metadata(c, pb, atom);

  294. 

  295.     switch (atom.type) {

  296.     case MKTAG(0xa9,'n','a','m'): key = "title";     break;

  297.     case MKTAG(0xa9,'a','u','t'):

  298.     case MKTAG(0xa9,'A','R','T'): key = "artist";    break;

  299.     case MKTAG( 'a','A','R','T'): key = "album_artist";    break;

  300.     case MKTAG(0xa9,'w','r','t'): key = "composer";  break;

  301.     case MKTAG( 'c','p','r','t'):

  302.     case MKTAG(0xa9,'c','p','y'): key = "copyright"; break;

  303.     case MKTAG(0xa9,'g','r','p'): key = "grouping"; break;

  304.     case MKTAG(0xa9,'l','y','r'): key = "lyrics"; break;

  305.     case MKTAG(0xa9,'c','m','t'):

  306.     case MKTAG(0xa9,'i','n','f'): key = "comment";   break;

  307.     case MKTAG(0xa9,'a','l','b'): key = "album";     break;

  308.     case MKTAG(0xa9,'d','a','y'): key = "date";      break;

  309.     case MKTAG(0xa9,'g','e','n'): key = "genre";     break;

  310.     case MKTAG( 'g','n','r','e'): key = "genre";

  311.         parse = mov_metadata_gnre; break;

  312.     case MKTAG(0xa9,'t','o','o'):

  313.     case MKTAG(0xa9,'s','w','r'): key = "encoder";   break;

  314.     case MKTAG(0xa9,'e','n','c'): key = "encoder";   break;

  315.     case MKTAG(0xa9,'m','a','k'): key = "make";      break;

  316.     case MKTAG(0xa9,'m','o','d'): key = "model";     break;

  317.     case MKTAG(0xa9,'x','y','z'): key = "location";  break;

  318.     case MKTAG( 'd','e','s','c'): key = "description";break;

  319.     case MKTAG( 'l','d','e','s'): key = "synopsis";  break;

  320.     case MKTAG( 't','v','s','h'): key = "show";      break;

  321.     case MKTAG( 't','v','e','n'): key = "episode_id";break;

  322.     case MKTAG( 't','v','n','n'): key = "network";   break;

  323.     case MKTAG( 't','r','k','n'): key = "track";

  324.         parse = mov_metadata_track_or_disc_number; break;

  325.     case MKTAG( 'd','i','s','k'): key = "disc";

  326.         parse = mov_metadata_track_or_disc_number; break;

  327.     case MKTAG( 't','v','e','s'): key = "episode_sort";

  328.         parse = mov_metadata_int8_bypass_padding; break;

  329.     case MKTAG( 't','v','s','n'): key = "season_number";

  330.         parse = mov_metadata_int8_bypass_padding; break;

  331.     case MKTAG( 's','t','i','k'): key = "media_type";

  332.         parse = mov_metadata_int8_no_padding; break;

  333.     case MKTAG( 'h','d','v','d'): key = "hd_video";

  334.         parse = mov_metadata_int8_no_padding; break;

  335.     case MKTAG( 'p','g','a','p'): key = "gapless_playback";

  336.         parse = mov_metadata_int8_no_padding; break;

  337.     }

  338. 

  339.     if (c->itunes_metadata && atom.size > 8) {

  340.         int data_size = avio_rb32(pb);

  341.         int tag = avio_rl32(pb);

  342.         if (tag == MKTAG('d','a','t','a')) {

  343.             data_type = avio_rb32(pb); // type

  344.             avio_rb32(pb); // unknown

  345.             str_size = data_size - 16;

  346.             atom.size -= 16;

  347. 

  348.             if (atom.type == MKTAG('c', 'o', 'v', 'r')) {

  349.                 int ret = mov_read_covr(c, pb, data_type, str_size);

  350.                 if (ret < 0) {

  351.                     av_log(c->fc, AV_LOG_ERROR, "Error parsing cover art.\n");

  352.                     return ret;

  353.                 }

  354.             }

  355.         } else return 0;

  356.     } else if (atom.size > 4 && key && !c->itunes_metadata) {

  357.         str_size = avio_rb16(pb); // string length

  358.         langcode = avio_rb16(pb);

  359.         ff_mov_lang_to_iso639(langcode, language);

  360.         atom.size -= 4;

  361.     } else

  362.         str_size = atom.size;

  363. 

  364. #ifdef MOV_EXPORT_ALL_METADATA

  365.     if (!key) {

  366.         snprintf(tmp_key, 5, "%.4s", (char*)&atom.type);

  367.         key = tmp_key;

  368.     }

  369. #endif

  370. 

  371.     if (!key)

  372.         return 0;

  373.     if (atom.size < 0)

  374.         return AVERROR_INVALIDDATA;

  375. 

  376.     str_size = FFMIN3(sizeof(str)-1, str_size, atom.size);

  377. 

  378.     if (parse)

  379.         parse(c, pb, str_size, key);

  380.     else {

  381.         if (data_type == 3 || (data_type == 0 && (langcode < 0x400 || langcode == 0x7fff))) { // MAC Encoded

  382.             mov_read_mac_string(c, pb, str_size, str, sizeof(str));

  383.         } else {

  384.             avio_read(pb, str, str_size);

  385.             str[str_size] = 0;

  386.         }

  387.         av_dict_set(&c->fc->metadata, key, str, 0);

  388.         if (*language && strcmp(language, "und")) {

  389.             snprintf(key2, sizeof(key2), "%s-%s", key, language);

  390.             av_dict_set(&c->fc->metadata, key2, str, 0);

  391.         }

  392.     }

  393.     av_dlog(c->fc, "lang \"%3s\" ", language);

  394.     av_dlog(c->fc, "tag \"%s\" value \"%s\" atom \"%.4s\" %d %"PRId64"\n",

  395.             key, str, (char*)&atom.type, str_size, atom.size);

  396. 

  397.     return 0;

  398. }

  399. 

  400. static int mov_read_chpl(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  401. {

  402.     int64_t start;

  403.     int i, nb_chapters, str_len, version;

  404.     char str[256+1];

  405. 

  406.     if ((atom.size -= 5) < 0)

  407.         return 0;

  408. 

  409.     version = avio_r8(pb);

  410.     avio_rb24(pb);

  411.     if (version)

  412.         avio_rb32(pb); // ???

  413.     nb_chapters = avio_r8(pb);

  414. 

  415.     for (i = 0; i < nb_chapters; i++) {

  416.         if (atom.size < 9)

  417.             return 0;

  418. 

  419.         start = avio_rb64(pb);

  420.         str_len = avio_r8(pb);

  421. 

  422.         if ((atom.size -= 9+str_len) < 0)

  423.             return 0;

  424. 

  425.         avio_read(pb, str, str_len);

  426.         str[str_len] = 0;

  427.         avpriv_new_chapter(c->fc, i, (AVRational){1,10000000}, start, AV_NOPTS_VALUE, str);

  428.     }

  429.     return 0;

  430. }

  431. 

  432. static int mov_read_dref(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  433. {

  434.     AVStream *st;

  435.     MOVStreamContext *sc;

  436.     int entries, i, j;

  437. 

  438.     if (c->fc->nb_streams < 1)

  439.         return 0;

  440.     st = c->fc->streams[c->fc->nb_streams-1];

  441.     sc = st->priv_data;

  442. 

  443.     avio_rb32(pb); // version + flags

  444.     entries = avio_rb32(pb);

  445.     if (entries >= UINT_MAX / sizeof(*sc->drefs))

  446.         return AVERROR_INVALIDDATA;

  447.     av_free(sc->drefs);

  448.     sc->drefs_count = 0;

  449.     sc->drefs = av_mallocz(entries * sizeof(*sc->drefs));

  450.     if (!sc->drefs)

  451.         return AVERROR(ENOMEM);

  452.     sc->drefs_count = entries;

  453. 

  454.     for (i = 0; i < sc->drefs_count; i++) {

  455.         MOVDref *dref = &sc->drefs[i];

  456.         uint32_t size = avio_rb32(pb);

  457.         int64_t next = avio_tell(pb) + size - 4;

  458. 

  459.         if (size < 12)

  460.             return AVERROR_INVALIDDATA;

  461. 

  462.         dref->type = avio_rl32(pb);

  463.         avio_rb32(pb); // version + flags

  464.         av_dlog(c->fc, "type %.4s size %d\n", (char*)&dref->type, size);

  465. 

  466.         if (dref->type == MKTAG('a','l','i','s') && size > 150) {

  467.             /* macintosh alias record */

  468.             uint16_t volume_len, len;

  469.             int16_t type;

  470. 

  471.             avio_skip(pb, 10);

  472. 

  473.             volume_len = avio_r8(pb);

  474.             volume_len = FFMIN(volume_len, 27);

  475.             avio_read(pb, dref->volume, 27);

  476.             dref->volume[volume_len] = 0;

  477.             av_log(c->fc, AV_LOG_DEBUG, "volume %s, len %d\n", dref->volume, volume_len);

  478. 

  479.             avio_skip(pb, 12);

  480. 

  481.             len = avio_r8(pb);

  482.             len = FFMIN(len, 63);

  483.             avio_read(pb, dref->filename, 63);

  484.             dref->filename[len] = 0;

  485.             av_log(c->fc, AV_LOG_DEBUG, "filename %s, len %d\n", dref->filename, len);

  486. 

  487.             avio_skip(pb, 16);

  488. 

  489.             /* read next level up_from_alias/down_to_target */

  490.             dref->nlvl_from = avio_rb16(pb);

  491.             dref->nlvl_to   = avio_rb16(pb);

  492.             av_log(c->fc, AV_LOG_DEBUG, "nlvl from %d, nlvl to %d\n",

  493.                    dref->nlvl_from, dref->nlvl_to);

  494. 

  495.             avio_skip(pb, 16);

  496. 

  497.             for (type = 0; type != -1 && avio_tell(pb) < next; ) {

  498.                 if(url_feof(pb))

  499.                     return AVERROR_EOF;

  500.                 type = avio_rb16(pb);

  501.                 len = avio_rb16(pb);

  502.                 av_log(c->fc, AV_LOG_DEBUG, "type %d, len %d\n", type, len);

  503.                 if (len&1)

  504.                     len += 1;

  505.                 if (type == 2) { // absolute path

  506.                     av_free(dref->path);

  507.                     dref->path = av_mallocz(len+1);

  508.                     if (!dref->path)

  509.                         return AVERROR(ENOMEM);

  510.                     avio_read(pb, dref->path, len);

  511.                     if (len > volume_len && !strncmp(dref->path, dref->volume, volume_len)) {

  512.                         len -= volume_len;

  513.                         memmove(dref->path, dref->path+volume_len, len);

  514.                         dref->path[len] = 0;

  515.                     }

  516.                     for (j = 0; j < len; j++)

  517.                         if (dref->path[j] == ':')

  518.                             dref->path[j] = '/';

  519.                     av_log(c->fc, AV_LOG_DEBUG, "path %s\n", dref->path);

  520.                 } else if (type == 0) { // directory name

  521.                     av_free(dref->dir);

  522.                     dref->dir = av_malloc(len+1);

  523.                     if (!dref->dir)

  524.                         return AVERROR(ENOMEM);

  525.                     avio_read(pb, dref->dir, len);

  526.                     dref->dir[len] = 0;

  527.                     for (j = 0; j < len; j++)

  528.                         if (dref->dir[j] == ':')

  529.                             dref->dir[j] = '/';

  530.                     av_log(c->fc, AV_LOG_DEBUG, "dir %s\n", dref->dir);

  531.                 } else

  532.                     avio_skip(pb, len);

  533.             }

  534.         }

  535.         avio_seek(pb, next, SEEK_SET);

  536.     }

  537.     return 0;

  538. }

  539. 

  540. static int mov_read_hdlr(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  541. {

  542.     AVStream *st;

  543.     uint32_t type;

  544.     uint32_t av_unused ctype;

  545.     int title_size;

  546.     char *title_str;

  547. 

  548.     if (c->fc->nb_streams < 1) // meta before first trak

  549.         return 0;

  550. 

  551.     st = c->fc->streams[c->fc->nb_streams-1];

  552. 

  553.     avio_r8(pb); /* version */

  554.     avio_rb24(pb); /* flags */

  555. 

  556.     /* component type */

  557.     ctype = avio_rl32(pb);

  558.     type = avio_rl32(pb); /* component subtype */

  559. 

  560.     av_dlog(c->fc, "ctype= %.4s (0x%08x)\n", (char*)&ctype, ctype);

  561.     av_dlog(c->fc, "stype= %.4s\n", (char*)&type);

  562. 

  563.     if     (type == MKTAG('v','i','d','e'))

  564.         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

  565.     else if (type == MKTAG('s','o','u','n'))

  566.         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

  567.     else if (type == MKTAG('m','1','a',' '))

  568.         st->codec->codec_id = AV_CODEC_ID_MP2;

  569.     else if ((type == MKTAG('s','u','b','p')) || (type == MKTAG('c','l','c','p')))

  570.         st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;

  571. 

  572.     avio_rb32(pb); /* component  manufacture */

  573.     avio_rb32(pb); /* component flags */

  574.     avio_rb32(pb); /* component flags mask */

  575. 

  576.     title_size = atom.size - 24;

  577.     if (title_size > 0) {

  578.         title_str = av_malloc(title_size + 1); /* Add null terminator */

  579.         if (!title_str)

  580.             return AVERROR(ENOMEM);

  581.         avio_read(pb, title_str, title_size);

  582.         title_str[title_size] = 0;

  583.         if (title_str[0])

  584.             av_dict_set(&st->metadata, "handler_name", title_str +

  585.                         (!c->isom && title_str[0] == title_size - 1), 0);

  586.         av_freep(&title_str);

  587.     }

  588. 

  589.     return 0;

  590. }

  591. 

  592. int ff_mov_read_esds(AVFormatContext *fc, AVIOContext *pb, MOVAtom atom)

  593. {

  594.     AVStream *st;

  595.     int tag;

  596. 

  597.     if (fc->nb_streams < 1)

  598.         return 0;

  599.     st = fc->streams[fc->nb_streams-1];

  600. 

  601.     avio_rb32(pb); /* version + flags */

  602.     ff_mp4_read_descr(fc, pb, &tag);

  603.     if (tag == MP4ESDescrTag) {

  604.         ff_mp4_parse_es_descr(pb, NULL);

  605.     } else

  606.         avio_rb16(pb); /* ID */

  607. 

  608.     ff_mp4_read_descr(fc, pb, &tag);

  609.     if (tag == MP4DecConfigDescrTag)

  610.         ff_mp4_read_dec_config_descr(fc, st, pb);

  611.     return 0;

  612. }

  613. 

  614. static int mov_read_esds(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  615. {

  616.     return ff_mov_read_esds(c->fc, pb, atom);

  617. }

  618. 

  619. static int mov_read_dac3(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  620. {

  621.     AVStream *st;

  622.     int ac3info, acmod, lfeon, bsmod;

  623. 

  624.     if (c->fc->nb_streams < 1)

  625.         return 0;

  626.     st = c->fc->streams[c->fc->nb_streams-1];

  627. 

  628.     ac3info = avio_rb24(pb);

  629.     bsmod = (ac3info >> 14) & 0x7;

  630.     acmod = (ac3info >> 11) & 0x7;

  631.     lfeon = (ac3info >> 10) & 0x1;

  632.     st->codec->channels = ((int[]){2,1,2,3,3,4,4,5})[acmod] + lfeon;

  633.     st->codec->channel_layout = avpriv_ac3_channel_layout_tab[acmod];

  634.     if (lfeon)

  635.         st->codec->channel_layout |= AV_CH_LOW_FREQUENCY;

  636.     st->codec->audio_service_type = bsmod;

  637.     if (st->codec->channels > 1 && bsmod == 0x7)

  638.         st->codec->audio_service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE;

  639. 

  640.     return 0;

  641. }

  642. 

  643. static int mov_read_dec3(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  644. {

  645.     AVStream *st;

  646.     int eac3info, acmod, lfeon, bsmod;

  647. 

  648.     if (c->fc->nb_streams < 1)

  649.         return 0;

  650.     st = c->fc->streams[c->fc->nb_streams-1];

  651. 

  652.     /* No need to parse fields for additional independent substreams and its

  653.      * associated dependent substreams since libavcodec's E-AC-3 decoder

  654.      * does not support them yet. */

  655.     avio_rb16(pb); /* data_rate and num_ind_sub */

  656.     eac3info = avio_rb24(pb);

  657.     bsmod = (eac3info >> 12) & 0x1f;

  658.     acmod = (eac3info >>  9) & 0x7;

  659.     lfeon = (eac3info >>  8) & 0x1;

  660.     st->codec->channel_layout = avpriv_ac3_channel_layout_tab[acmod];

  661.     if (lfeon)

  662.         st->codec->channel_layout |= AV_CH_LOW_FREQUENCY;

  663.     st->codec->channels = av_get_channel_layout_nb_channels(st->codec->channel_layout);

  664.     st->codec->audio_service_type = bsmod;

  665.     if (st->codec->channels > 1 && bsmod == 0x7)

  666.         st->codec->audio_service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE;

  667. 

  668.     return 0;

  669. }

  670. 

  671. static int mov_read_chan(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  672. {

  673.     AVStream *st;

  674. 

  675.     if (c->fc->nb_streams < 1)

  676.         return 0;

  677.     st = c->fc->streams[c->fc->nb_streams-1];

  678. 

  679.     if (atom.size < 16)

  680.         return 0;

  681. 

  682.     ff_mov_read_chan(c->fc, pb, st, atom.size - 4);

  683. 

  684.     return 0;

  685. }

  686. 

  687. static int mov_read_wfex(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  688. {

  689.     AVStream *st;

  690. 

  691.     if (c->fc->nb_streams < 1)

  692.         return 0;

  693.     st = c->fc->streams[c->fc->nb_streams-1];

  694. 

  695.     if (ff_get_wav_header(pb, st->codec, atom.size) < 0) {

  696.         av_log(c->fc, AV_LOG_WARNING, "get_wav_header failed\n");

  697.     }

  698. 

  699.     return 0;

  700. }

  701. 

  702. static int mov_read_pasp(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  703. {

  704.     const int num = avio_rb32(pb);

  705.     const int den = avio_rb32(pb);

  706.     AVStream *st;

  707. 

  708.     if (c->fc->nb_streams < 1)

  709.         return 0;

  710.     st = c->fc->streams[c->fc->nb_streams-1];

  711. 

  712.     if ((st->sample_aspect_ratio.den != 1 || st->sample_aspect_ratio.num) && // default

  713.         (den != st->sample_aspect_ratio.den || num != st->sample_aspect_ratio.num)) {

  714.         av_log(c->fc, AV_LOG_WARNING,

  715.                "sample aspect ratio already set to %d:%d, ignoring 'pasp' atom (%d:%d)\n",

  716.                st->sample_aspect_ratio.num, st->sample_aspect_ratio.den,

  717.                num, den);

  718.     } else if (den != 0) {

  719.         st->sample_aspect_ratio.num = num;

  720.         st->sample_aspect_ratio.den = den;

  721.     }

  722.     return 0;

  723. }

  724. 

  725. /* this atom contains actual media data */

  726. static int mov_read_mdat(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  727. {

  728.     if (atom.size == 0) /* wrong one (MP4) */

  729.         return 0;

  730.     c->found_mdat=1;

  731.     return 0; /* now go for moov */

  732. }

  733. 

  734. /* read major brand, minor version and compatible brands and store them as metadata */

  735. static int mov_read_ftyp(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  736. {

  737.     uint32_t minor_ver;

  738.     int comp_brand_size;

  739.     char minor_ver_str[11]; /* 32 bit integer -> 10 digits + null */

  740.     char* comp_brands_str;

  741.     uint8_t type[5] = {0};

  742. 

  743.     avio_read(pb, type, 4);

  744.     if (strcmp(type, "qt  "))

  745.         c->isom = 1;

  746.     av_log(c->fc, AV_LOG_DEBUG, "ISO: File Type Major Brand: %.4s\n",(char *)&type);

  747.     av_dict_set(&c->fc->metadata, "major_brand", type, 0);

  748.     minor_ver = avio_rb32(pb); /* minor version */

  749.     snprintf(minor_ver_str, sizeof(minor_ver_str), "%d", minor_ver);

  750.     av_dict_set(&c->fc->metadata, "minor_version", minor_ver_str, 0);

  751. 

  752.     comp_brand_size = atom.size - 8;

  753.     if (comp_brand_size < 0)

  754.         return AVERROR_INVALIDDATA;

  755.     comp_brands_str = av_malloc(comp_brand_size + 1); /* Add null terminator */

  756.     if (!comp_brands_str)

  757.         return AVERROR(ENOMEM);

  758.     avio_read(pb, comp_brands_str, comp_brand_size);

  759.     comp_brands_str[comp_brand_size] = 0;

  760.     av_dict_set(&c->fc->metadata, "compatible_brands", comp_brands_str, 0);

  761.     av_freep(&comp_brands_str);

  762. 

  763.     return 0;

  764. }

  765. 

  766. /* this atom should contain all header atoms */

  767. static int mov_read_moov(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  768. {

  769.     int ret;

  770. 

  771.     if ((ret = mov_read_default(c, pb, atom)) < 0)

  772.         return ret;

  773.     /* we parsed the 'moov' atom, we can terminate the parsing as soon as we find the 'mdat' */

  774.     /* so we don't parse the whole file if over a network */

  775.     c->found_moov=1;

  776.     return 0; /* now go for mdat */

  777. }

  778. 

  779. static int mov_read_moof(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  780. {

  781.     c->fragment.moof_offset = avio_tell(pb) - 8;

  782.     av_dlog(c->fc, "moof offset %"PRIx64"\n", c->fragment.moof_offset);

  783.     return mov_read_default(c, pb, atom);

  784. }

  785. 

  786. static void mov_metadata_creation_time(AVDictionary **metadata, int64_t time)

  787. {

  788.     char buffer[32];

  789.     if (time) {

  790.         struct tm *ptm;

  791.         time_t timet;

  792.         if(time >= 2082844800)

  793.             time -= 2082844800;  /* seconds between 1904-01-01 and Epoch */

  794.         timet = time;

  795.         ptm = gmtime(&timet);

  796.         if (!ptm) return;

  797.         strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", ptm);

  798.         av_dict_set(metadata, "creation_time", buffer, 0);

  799.     }

  800. }

  801. 

  802. static int mov_read_mdhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  803. {

  804.     AVStream *st;

  805.     MOVStreamContext *sc;

  806.     int version;

  807.     char language[4] = {0};

  808.     unsigned lang;

  809.     int64_t creation_time;

  810. 

  811.     if (c->fc->nb_streams < 1)

  812.         return 0;

  813.     st = c->fc->streams[c->fc->nb_streams-1];

  814.     sc = st->priv_data;

  815. 

  816.     version = avio_r8(pb);

  817.     if (version > 1) {

  818.         av_log_ask_for_sample(c, "unsupported version %d\n", version);

  819.         return AVERROR_PATCHWELCOME;

  820.     }

  821.     avio_rb24(pb); /* flags */

  822.     if (version == 1) {

  823.         creation_time = avio_rb64(pb);

  824.         avio_rb64(pb);

  825.     } else {

  826.         creation_time = avio_rb32(pb);

  827.         avio_rb32(pb); /* modification time */

  828.     }

  829.     mov_metadata_creation_time(&st->metadata, creation_time);

  830. 

  831.     sc->time_scale = avio_rb32(pb);

  832.     st->duration = (version == 1) ? avio_rb64(pb) : avio_rb32(pb); /* duration */

  833. 

  834.     lang = avio_rb16(pb); /* language */

  835.     if (ff_mov_lang_to_iso639(lang, language))

  836.         av_dict_set(&st->metadata, "language", language, 0);

  837.     avio_rb16(pb); /* quality */

  838. 

  839.     return 0;

  840. }

  841. 

  842. static int mov_read_mvhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  843. {

  844.     int64_t creation_time;

  845.     int version = avio_r8(pb); /* version */

  846.     avio_rb24(pb); /* flags */

  847. 

  848.     if (version == 1) {

  849.         creation_time = avio_rb64(pb);

  850.         avio_rb64(pb);

  851.     } else {

  852.         creation_time = avio_rb32(pb);

  853.         avio_rb32(pb); /* modification time */

  854.     }

  855.     mov_metadata_creation_time(&c->fc->metadata, creation_time);

  856.     c->time_scale = avio_rb32(pb); /* time scale */

  857. 

  858.     av_dlog(c->fc, "time scale = %i\n", c->time_scale);

  859. 

  860.     c->duration = (version == 1) ? avio_rb64(pb) : avio_rb32(pb); /* duration */

  861.     // set the AVCodecContext duration because the duration of individual tracks

  862.     // may be inaccurate

  863.     if (c->time_scale > 0)

  864.         c->fc->duration = av_rescale(c->duration, AV_TIME_BASE, c->time_scale);

  865.     avio_rb32(pb); /* preferred scale */

  866. 

  867.     avio_rb16(pb); /* preferred volume */

  868. 

  869.     avio_skip(pb, 10); /* reserved */

  870. 

  871.     avio_skip(pb, 36); /* display matrix */

  872. 

  873.     avio_rb32(pb); /* preview time */

  874.     avio_rb32(pb); /* preview duration */

  875.     avio_rb32(pb); /* poster time */

  876.     avio_rb32(pb); /* selection time */

  877.     avio_rb32(pb); /* selection duration */

  878.     avio_rb32(pb); /* current time */

  879.     avio_rb32(pb); /* next track ID */

  880.     return 0;

  881. }

  882. 

  883. static int mov_read_enda(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  884. {

  885.     AVStream *st;

  886.     int little_endian;

  887. 

  888.     if (c->fc->nb_streams < 1)

  889.         return 0;

  890.     st = c->fc->streams[c->fc->nb_streams-1];

  891. 

  892.     little_endian = avio_rb16(pb) & 0xFF;

  893.     av_dlog(c->fc, "enda %d\n", little_endian);

  894.     if (little_endian == 1) {

  895.         switch (st->codec->codec_id) {

  896.         case AV_CODEC_ID_PCM_S24BE:

  897.             st->codec->codec_id = AV_CODEC_ID_PCM_S24LE;

  898.             break;

  899.         case AV_CODEC_ID_PCM_S32BE:

  900.             st->codec->codec_id = AV_CODEC_ID_PCM_S32LE;

  901.             break;

  902.         case AV_CODEC_ID_PCM_F32BE:

  903.             st->codec->codec_id = AV_CODEC_ID_PCM_F32LE;

  904.             break;

  905.         case AV_CODEC_ID_PCM_F64BE:

  906.             st->codec->codec_id = AV_CODEC_ID_PCM_F64LE;

  907.             break;

  908.         default:

  909.             break;

  910.         }

  911.     }

  912.     return 0;

  913. }

  914. 

  915. static int mov_read_fiel(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  916. {

  917.     AVStream *st;

  918.     unsigned mov_field_order;

  919.     enum AVFieldOrder decoded_field_order = AV_FIELD_UNKNOWN;

  920. 

  921.     if (c->fc->nb_streams < 1) // will happen with jp2 files

  922.         return 0;

  923.     st = c->fc->streams[c->fc->nb_streams-1];

  924.     if (atom.size < 2)

  925.         return AVERROR_INVALIDDATA;

  926.     mov_field_order = avio_rb16(pb);

  927.     if ((mov_field_order & 0xFF00) == 0x0100)

  928.         decoded_field_order = AV_FIELD_PROGRESSIVE;

  929.     else if ((mov_field_order & 0xFF00) == 0x0200) {

  930.         switch (mov_field_order & 0xFF) {

  931.         case 0x01: decoded_field_order = AV_FIELD_TT;

  932.                    break;

  933.         case 0x06: decoded_field_order = AV_FIELD_BB;

  934.                    break;

  935.         case 0x09: decoded_field_order = AV_FIELD_TB;

  936.                    break;

  937.         case 0x0E: decoded_field_order = AV_FIELD_BT;

  938.                    break;

  939.         }

  940.     }

  941.     if (decoded_field_order == AV_FIELD_UNKNOWN && mov_field_order) {

  942.         av_log(NULL, AV_LOG_ERROR, "Unknown MOV field order 0x%04x\n", mov_field_order);

  943.     }

  944.     st->codec->field_order = decoded_field_order;

  945. 

  946.     return 0;

  947. }

  948. 

  949. /* FIXME modify qdm2/svq3/h264 decoders to take full atom as extradata */

  950. static int mov_read_extradata(MOVContext *c, AVIOContext *pb, MOVAtom atom,

  951.                               enum AVCodecID codec_id)

  952. {

  953.     AVStream *st;

  954.     uint64_t size;

  955.     uint8_t *buf;

  956. 

  957.     if (c->fc->nb_streams < 1) // will happen with jp2 files

  958.         return 0;

  959.     st= c->fc->streams[c->fc->nb_streams-1];

  960. 

  961.     if (st->codec->codec_id != codec_id)

  962.         return 0; /* unexpected codec_id - don't mess with extradata */

  963. 

  964.     size= (uint64_t)st->codec->extradata_size + atom.size + 8 + FF_INPUT_BUFFER_PADDING_SIZE;

  965.     if (size > INT_MAX || (uint64_t)atom.size > INT_MAX)

  966.         return AVERROR_INVALIDDATA;

  967.     buf= av_realloc(st->codec->extradata, size);

  968.     if (!buf)

  969.         return AVERROR(ENOMEM);

  970.     st->codec->extradata= buf;

  971.     buf+= st->codec->extradata_size;

  972.     st->codec->extradata_size= size - FF_INPUT_BUFFER_PADDING_SIZE;

  973.     AV_WB32(       buf    , atom.size + 8);

  974.     AV_WL32(       buf + 4, atom.type);

  975.     avio_read(pb, buf + 8, atom.size);

  976.     return 0;

  977. }

  978. 

  979. /* wrapper functions for reading ALAC/AVS/MJPEG/MJPEG2000 extradata atoms only for those codecs */

  980. static int mov_read_alac(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  981. {

  982.     return mov_read_extradata(c, pb, atom, AV_CODEC_ID_ALAC);

  983. }

  984. 

  985. static int mov_read_avss(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  986. {

  987.     return mov_read_extradata(c, pb, atom, AV_CODEC_ID_AVS);

  988. }

  989. 

  990. static int mov_read_jp2h(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  991. {

  992.     return mov_read_extradata(c, pb, atom, AV_CODEC_ID_JPEG2000);

  993. }

  994. 

  995. static int mov_read_avid(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  996. {

  997.     return mov_read_extradata(c, pb, atom, AV_CODEC_ID_AVUI);

  998. }

  999. 

  1000. static int mov_read_svq3(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1001. {

  1002.     return mov_read_extradata(c, pb, atom, AV_CODEC_ID_SVQ3);

  1003. }

  1004. 

  1005. static int mov_read_wave(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1006. {

  1007.     AVStream *st;

  1008. 

  1009.     if (c->fc->nb_streams < 1)

  1010.         return 0;

  1011.     st = c->fc->streams[c->fc->nb_streams-1];

  1012. 

  1013.     if ((uint64_t)atom.size > (1<<30))

  1014.         return AVERROR_INVALIDDATA;

  1015. 

  1016.     if (st->codec->codec_id == AV_CODEC_ID_QDM2 || st->codec->codec_id == AV_CODEC_ID_QDMC) {

  1017.         // pass all frma atom to codec, needed at least for QDMC and QDM2

  1018.         av_free(st->codec->extradata);

  1019.         st->codec->extradata_size = 0;

  1020.         st->codec->extradata = av_mallocz(atom.size + FF_INPUT_BUFFER_PADDING_SIZE);

  1021.         if (!st->codec->extradata)

  1022.             return AVERROR(ENOMEM);

  1023.         st->codec->extradata_size = atom.size;

  1024.         avio_read(pb, st->codec->extradata, atom.size);

  1025.     } else if (atom.size > 8) { /* to read frma, esds atoms */

  1026.         int ret;

  1027.         if ((ret = mov_read_default(c, pb, atom)) < 0)

  1028.             return ret;

  1029.     } else

  1030.         avio_skip(pb, atom.size);

  1031.     return 0;

  1032. }

  1033. 

  1034. /**

  1035.  * This function reads atom content and puts data in extradata without tag

  1036.  * nor size unlike mov_read_extradata.

  1037.  */

  1038. static int mov_read_glbl(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1039. {

  1040.     AVStream *st;

  1041. 

  1042.     if (c->fc->nb_streams < 1)

  1043.         return 0;

  1044.     st = c->fc->streams[c->fc->nb_streams-1];

  1045. 

  1046.     if ((uint64_t)atom.size > (1<<30))

  1047.         return AVERROR_INVALIDDATA;

  1048. 

  1049.     if (atom.size >= 10) {

  1050.         // Broken files created by legacy versions of libavformat will

  1051.         // wrap a whole fiel atom inside of a glbl atom.

  1052.         unsigned size = avio_rb32(pb);

  1053.         unsigned type = avio_rl32(pb);

  1054.         avio_seek(pb, -8, SEEK_CUR);

  1055.         if (type == MKTAG('f','i','e','l') && size == atom.size)

  1056.             return mov_read_default(c, pb, atom);

  1057.     }

  1058.     av_free(st->codec->extradata);

  1059.     st->codec->extradata_size = 0;

  1060.     st->codec->extradata = av_mallocz(atom.size + FF_INPUT_BUFFER_PADDING_SIZE);

  1061.     if (!st->codec->extradata)

  1062.         return AVERROR(ENOMEM);

  1063.     st->codec->extradata_size = atom.size;

  1064.     avio_read(pb, st->codec->extradata, atom.size);

  1065.     return 0;

  1066. }

  1067. 

  1068. static int mov_read_dvc1(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1069. {

  1070.     AVStream *st;

  1071.     uint8_t profile_level;

  1072. 

  1073.     if (c->fc->nb_streams < 1)

  1074.         return 0;

  1075.     st = c->fc->streams[c->fc->nb_streams-1];

  1076. 

  1077.     if (atom.size >= (1<<28) || atom.size < 7)

  1078.         return AVERROR_INVALIDDATA;

  1079. 

  1080.     profile_level = avio_r8(pb);

  1081.     if ((profile_level & 0xf0) != 0xc0)

  1082.         return 0;

  1083. 

  1084.     av_free(st->codec->extradata);

  1085.     st->codec->extradata_size = 0;

  1086.     st->codec->extradata = av_mallocz(atom.size - 7 + FF_INPUT_BUFFER_PADDING_SIZE);

  1087.     if (!st->codec->extradata)

  1088.         return AVERROR(ENOMEM);

  1089.     st->codec->extradata_size = atom.size - 7;

  1090.     avio_seek(pb, 6, SEEK_CUR);

  1091.     avio_read(pb, st->codec->extradata, st->codec->extradata_size);

  1092.     return 0;

  1093. }

  1094. 

  1095. /**

  1096.  * An strf atom is a BITMAPINFOHEADER struct. This struct is 40 bytes itself,

  1097.  * but can have extradata appended at the end after the 40 bytes belonging

  1098.  * to the struct.

  1099.  */

  1100. static int mov_read_strf(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1101. {

  1102.     AVStream *st;

  1103. 

  1104.     if (c->fc->nb_streams < 1)

  1105.         return 0;

  1106.     if (atom.size <= 40)

  1107.         return 0;

  1108.     st = c->fc->streams[c->fc->nb_streams-1];

  1109. 

  1110.     if ((uint64_t)atom.size > (1<<30))

  1111.         return AVERROR_INVALIDDATA;

  1112. 

  1113.     av_free(st->codec->extradata);

  1114.     st->codec->extradata_size = 0;

  1115.     st->codec->extradata = av_mallocz(atom.size - 40 + FF_INPUT_BUFFER_PADDING_SIZE);

  1116.     if (!st->codec->extradata)

  1117.         return AVERROR(ENOMEM);

  1118.     st->codec->extradata_size = atom.size - 40;

  1119.     avio_skip(pb, 40);

  1120.     avio_read(pb, st->codec->extradata, atom.size - 40);

  1121.     return 0;

  1122. }

  1123. 

  1124. static int mov_read_stco(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1125. {

  1126.     AVStream *st;

  1127.     MOVStreamContext *sc;

  1128.     unsigned int i, entries;

  1129. 

  1130.     if (c->fc->nb_streams < 1)

  1131.         return 0;

  1132.     st = c->fc->streams[c->fc->nb_streams-1];

  1133.     sc = st->priv_data;

  1134. 

  1135.     avio_r8(pb); /* version */

  1136.     avio_rb24(pb); /* flags */

  1137. 

  1138.     entries = avio_rb32(pb);

  1139. 

  1140.     if (!entries)

  1141.         return 0;

  1142.     if (entries >= UINT_MAX/sizeof(int64_t))

  1143.         return AVERROR_INVALIDDATA;

  1144. 

  1145.     sc->chunk_offsets = av_malloc(entries * sizeof(int64_t));

  1146.     if (!sc->chunk_offsets)

  1147.         return AVERROR(ENOMEM);

  1148.     sc->chunk_count = entries;

  1149. 

  1150.     if      (atom.type == MKTAG('s','t','c','o'))

  1151.         for (i = 0; i < entries && !pb->eof_reached; i++)

  1152.             sc->chunk_offsets[i] = avio_rb32(pb);

  1153.     else if (atom.type == MKTAG('c','o','6','4'))

  1154.         for (i = 0; i < entries && !pb->eof_reached; i++)

  1155.             sc->chunk_offsets[i] = avio_rb64(pb);

  1156.     else

  1157.         return AVERROR_INVALIDDATA;

  1158. 

  1159.     sc->chunk_count = i;

  1160. 

  1161.     if (pb->eof_reached)

  1162.         return AVERROR_EOF;

  1163. 

  1164.     return 0;

  1165. }

  1166. 

  1167. /**

  1168.  * Compute codec id for 'lpcm' tag.

  1169.  * See CoreAudioTypes and AudioStreamBasicDescription at Apple.

  1170.  */

  1171. enum AVCodecID ff_mov_get_lpcm_codec_id(int bps, int flags)

  1172. {

  1173.     /* lpcm flags:

  1174.      * 0x1 = float

  1175.      * 0x2 = big-endian

  1176.      * 0x4 = signed

  1177.      */

  1178.     return ff_get_pcm_codec_id(bps, flags & 1, flags & 2, flags & 4 ? -1 : 0);

  1179. }

  1180. 

  1181. int ff_mov_read_stsd_entries(MOVContext *c, AVIOContext *pb, int entries)

  1182. {

  1183.     AVStream *st;

  1184.     MOVStreamContext *sc;

  1185.     int j, pseudo_stream_id;

  1186. 

  1187.     if (c->fc->nb_streams < 1)

  1188.         return 0;

  1189.     st = c->fc->streams[c->fc->nb_streams-1];

  1190.     sc = st->priv_data;

  1191. 

  1192.     for (pseudo_stream_id = 0;

  1193.          pseudo_stream_id < entries && !pb->eof_reached;

  1194.          pseudo_stream_id++) {

  1195.         //Parsing Sample description table

  1196.         enum AVCodecID id;

  1197.         int dref_id = 1;

  1198.         MOVAtom a = { AV_RL32("stsd") };

  1199.         int64_t start_pos = avio_tell(pb);

  1200.         int64_t size = avio_rb32(pb); /* size */

  1201.         uint32_t format = avio_rl32(pb); /* data format */

  1202. 

  1203.         if (size >= 16) {

  1204.             avio_rb32(pb); /* reserved */

  1205.             avio_rb16(pb); /* reserved */

  1206.             dref_id = avio_rb16(pb);

  1207.         }else if (size <= 7){

  1208.             av_log(c->fc, AV_LOG_ERROR, "invalid size %"PRId64" in stsd\n", size);

  1209.             return AVERROR_INVALIDDATA;

  1210.         }

  1211. 

  1212.         if (st->codec->codec_tag &&

  1213.             st->codec->codec_tag != format &&

  1214.             (c->fc->video_codec_id ? ff_codec_get_id(ff_codec_movvideo_tags, format) != c->fc->video_codec_id

  1215.                                    : st->codec->codec_tag != MKTAG('j','p','e','g'))

  1216.            ){

  1217.             /* Multiple fourcc, we skip JPEG. This is not correct, we should

  1218.              * export it as a separate AVStream but this needs a few changes

  1219.              * in the MOV demuxer, patch welcome. */

  1220.             av_log(c->fc, AV_LOG_WARNING, "multiple fourcc not supported\n");

  1221.             avio_skip(pb, size - (avio_tell(pb) - start_pos));

  1222.             continue;

  1223.         }

  1224.         /* we cannot demux concatenated h264 streams because of different extradata */

  1225.         if (st->codec->codec_tag && st->codec->codec_tag == AV_RL32("avc1"))

  1226.             av_log(c->fc, AV_LOG_WARNING, "Concatenated H.264 might not play corrently.\n");

  1227.         sc->pseudo_stream_id = st->codec->codec_tag ? -1 : pseudo_stream_id;

  1228.         sc->dref_id= dref_id;

  1229. 

  1230.         st->codec->codec_tag = format;

  1231.         id = ff_codec_get_id(ff_codec_movaudio_tags, format);

  1232.         if (id<=0 && ((format&0xFFFF) == 'm'+('s'<<8) || (format&0xFFFF) == 'T'+('S'<<8)))

  1233.             id = ff_codec_get_id(ff_codec_wav_tags, av_bswap32(format)&0xFFFF);

  1234. 

  1235.         if (st->codec->codec_type != AVMEDIA_TYPE_VIDEO && id > 0) {

  1236.             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

  1237.         } else if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO && /* do not overwrite codec type */

  1238.                    format && format != MKTAG('m','p','4','s')) { /* skip old asf mpeg4 tag */

  1239.             id = ff_codec_get_id(ff_codec_movvideo_tags, format);

  1240.             if (id <= 0)

  1241.                 id = ff_codec_get_id(ff_codec_bmp_tags, format);

  1242.             if (id > 0)

  1243.                 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

  1244.             else if (st->codec->codec_type == AVMEDIA_TYPE_DATA ||

  1245.                      (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE &&

  1246.                       st->codec->codec_id == AV_CODEC_ID_NONE)){

  1247.                 id = ff_codec_get_id(ff_codec_movsubtitle_tags, format);

  1248.                 if (id > 0)

  1249.                     st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;

  1250.             }

  1251.         }

  1252. 

  1253.         av_dlog(c->fc, "size=%"PRId64" 4CC= %c%c%c%c codec_type=%d\n", size,

  1254.                 (format >> 0) & 0xff, (format >> 8) & 0xff, (format >> 16) & 0xff,

  1255.                 (format >> 24) & 0xff, st->codec->codec_type);

  1256. 

  1257.         if (st->codec->codec_type==AVMEDIA_TYPE_VIDEO) {

  1258.             unsigned int color_depth, len;

  1259.             int color_greyscale;

  1260.             int color_table_id;

  1261. 

  1262.             avio_rb16(pb); /* version */

  1263.             avio_rb16(pb); /* revision level */

  1264.             avio_rb32(pb); /* vendor */

  1265.             avio_rb32(pb); /* temporal quality */

  1266.             avio_rb32(pb); /* spatial quality */

  1267. 

  1268.             st->codec->width = avio_rb16(pb); /* width */

  1269.             st->codec->height = avio_rb16(pb); /* height */

  1270. 

  1271.             avio_rb32(pb); /* horiz resolution */

  1272.             avio_rb32(pb); /* vert resolution */

  1273.             avio_rb32(pb); /* data size, always 0 */

  1274.             avio_rb16(pb); /* frames per samples */

  1275. 

  1276.             len = avio_r8(pb); /* codec name, pascal string */

  1277.             if (len > 31)

  1278.                 len = 31;

  1279.             mov_read_mac_string(c, pb, len, st->codec->codec_name, 32);

  1280.             if (len < 31)

  1281.                 avio_skip(pb, 31 - len);

  1282.             /* codec_tag YV12 triggers an UV swap in rawdec.c */

  1283.             if (!memcmp(st->codec->codec_name, "Planar Y'CbCr 8-bit 4:2:0", 25))

  1284.                 st->codec->codec_tag=MKTAG('I', '4', '2', '0');

  1285.             /* Flash Media Server streams files with Sorenson Spark and tag H263 */

  1286.             if (!memcmp(st->codec->codec_name, "Sorenson H263", 13)

  1287.                 && format == MKTAG('H','2','6','3'))

  1288.                 id = AV_CODEC_ID_FLV1;

  1289.             st->codec->codec_id = id;

  1290. 

  1291.             st->codec->bits_per_coded_sample = avio_rb16(pb); /* depth */

  1292.             color_table_id = avio_rb16(pb); /* colortable id */

  1293.             av_dlog(c->fc, "depth %d, ctab id %d\n",

  1294.                    st->codec->bits_per_coded_sample, color_table_id);

  1295.             /* figure out the palette situation */

  1296.             color_depth = st->codec->bits_per_coded_sample & 0x1F;

  1297.             color_greyscale = st->codec->bits_per_coded_sample & 0x20;

  1298. 

  1299.             /* if the depth is 2, 4, or 8 bpp, file is palettized */

  1300.             if ((color_depth == 2) || (color_depth == 4) ||

  1301.                 (color_depth == 8)) {

  1302.                 /* for palette traversal */

  1303.                 unsigned int color_start, color_count, color_end;

  1304.                 unsigned char a, r, g, b;

  1305. 

  1306.                 if (color_greyscale) {

  1307.                     int color_index, color_dec;

  1308.                     /* compute the greyscale palette */

  1309.                     st->codec->bits_per_coded_sample = color_depth;

  1310.                     color_count = 1 << color_depth;

  1311.                     color_index = 255;

  1312.                     color_dec = 256 / (color_count - 1);

  1313.                     for (j = 0; j < color_count; j++) {

  1314.                         if (id == AV_CODEC_ID_CINEPAK){

  1315.                             r = g = b = color_count - 1 - color_index;

  1316.                         }else

  1317.                         r = g = b = color_index;

  1318.                         sc->palette[j] =

  1319.                             (0xFFU << 24) | (r << 16) | (g << 8) | (b);

  1320.                         color_index -= color_dec;

  1321.                         if (color_index < 0)

  1322.                             color_index = 0;

  1323.                     }

  1324.                 } else if (color_table_id) {

  1325.                     const uint8_t *color_table;

  1326.                     /* if flag bit 3 is set, use the default palette */

  1327.                     color_count = 1 << color_depth;

  1328.                     if (color_depth == 2)

  1329.                         color_table = ff_qt_default_palette_4;

  1330.                     else if (color_depth == 4)

  1331.                         color_table = ff_qt_default_palette_16;

  1332.                     else

  1333.                         color_table = ff_qt_default_palette_256;

  1334. 

  1335.                     for (j = 0; j < color_count; j++) {

  1336.                         r = color_table[j * 3 + 0];

  1337.                         g = color_table[j * 3 + 1];

  1338.                         b = color_table[j * 3 + 2];

  1339.                         sc->palette[j] =

  1340.                             (0xFFU << 24) | (r << 16) | (g << 8) | (b);

  1341.                     }

  1342.                 } else {

  1343.                     /* load the palette from the file */

  1344.                     color_start = avio_rb32(pb);

  1345.                     color_count = avio_rb16(pb);

  1346.                     color_end = avio_rb16(pb);

  1347.                     if ((color_start <= 255) &&

  1348.                         (color_end <= 255)) {

  1349.                         for (j = color_start; j <= color_end; j++) {

  1350.                             /* each A, R, G, or B component is 16 bits;

  1351.                              * only use the top 8 bits */

  1352.                             a = avio_r8(pb);

  1353.                             avio_r8(pb);

  1354.                             r = avio_r8(pb);

  1355.                             avio_r8(pb);

  1356.                             g = avio_r8(pb);

  1357.                             avio_r8(pb);

  1358.                             b = avio_r8(pb);

  1359.                             avio_r8(pb);

  1360.                             sc->palette[j] =

  1361.                                 (a << 24 ) | (r << 16) | (g << 8) | (b);

  1362.                         }

  1363.                     }

  1364.                 }

  1365.                 sc->has_palette = 1;

  1366.             }

  1367.         } else if (st->codec->codec_type==AVMEDIA_TYPE_AUDIO) {

  1368.             int bits_per_sample, flags;

  1369.             uint16_t version = avio_rb16(pb);

  1370.             AVDictionaryEntry *compatible_brands = av_dict_get(c->fc->metadata, "compatible_brands", NULL, AV_DICT_MATCH_CASE);

  1371. 

  1372.             st->codec->codec_id = id;

  1373.             avio_rb16(pb); /* revision level */

  1374.             avio_rb32(pb); /* vendor */

  1375. 

  1376.             st->codec->channels = avio_rb16(pb);             /* channel count */

  1377.             av_dlog(c->fc, "audio channels %d\n", st->codec->channels);

  1378.             st->codec->bits_per_coded_sample = avio_rb16(pb);      /* sample size */

  1379. 

  1380.             sc->audio_cid = avio_rb16(pb);

  1381.             avio_rb16(pb); /* packet size = 0 */

  1382. 

  1383.             st->codec->sample_rate = ((avio_rb32(pb) >> 16));

  1384. 

  1385.             //Read QT version 1 fields. In version 0 these do not exist.

  1386.             av_dlog(c->fc, "version =%d, isom =%d\n",version,c->isom);

  1387.             if (!c->isom ||

  1388.                 (compatible_brands && strstr(compatible_brands->value, "qt  "))) {

  1389.                 if (version==1) {

  1390.                     sc->samples_per_frame = avio_rb32(pb);

  1391.                     avio_rb32(pb); /* bytes per packet */

  1392.                     sc->bytes_per_frame = avio_rb32(pb);

  1393.                     avio_rb32(pb); /* bytes per sample */

  1394.                 } else if (version==2) {

  1395.                     avio_rb32(pb); /* sizeof struct only */

  1396.                     st->codec->sample_rate = av_int2double(avio_rb64(pb)); /* float 64 */

  1397.                     st->codec->channels = avio_rb32(pb);

  1398.                     avio_rb32(pb); /* always 0x7F000000 */

  1399.                     st->codec->bits_per_coded_sample = avio_rb32(pb); /* bits per channel if sound is uncompressed */

  1400.                     flags = avio_rb32(pb); /* lpcm format specific flag */

  1401.                     sc->bytes_per_frame = avio_rb32(pb); /* bytes per audio packet if constant */

  1402.                     sc->samples_per_frame = avio_rb32(pb); /* lpcm frames per audio packet if constant */

  1403.                     if (format == MKTAG('l','p','c','m'))

  1404.                         st->codec->codec_id = ff_mov_get_lpcm_codec_id(st->codec->bits_per_coded_sample, flags);

  1405.                 }

  1406.             }

  1407. 

  1408.             switch (st->codec->codec_id) {

  1409.             case AV_CODEC_ID_PCM_S8:

  1410.             case AV_CODEC_ID_PCM_U8:

  1411.                 if (st->codec->bits_per_coded_sample == 16)

  1412.                     st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;

  1413.                 break;

  1414.             case AV_CODEC_ID_PCM_S16LE:

  1415.             case AV_CODEC_ID_PCM_S16BE:

  1416.                 if (st->codec->bits_per_coded_sample == 8)

  1417.                     st->codec->codec_id = AV_CODEC_ID_PCM_S8;

  1418.                 else if (st->codec->bits_per_coded_sample == 24)

  1419.                     st->codec->codec_id =

  1420.                         st->codec->codec_id == AV_CODEC_ID_PCM_S16BE ?

  1421.                         AV_CODEC_ID_PCM_S24BE : AV_CODEC_ID_PCM_S24LE;

  1422.                 break;

  1423.             /* set values for old format before stsd version 1 appeared */

  1424.             case AV_CODEC_ID_MACE3:

  1425.                 sc->samples_per_frame = 6;

  1426.                 sc->bytes_per_frame = 2*st->codec->channels;

  1427.                 break;

  1428.             case AV_CODEC_ID_MACE6:

  1429.                 sc->samples_per_frame = 6;

  1430.                 sc->bytes_per_frame = 1*st->codec->channels;

  1431.                 break;

  1432.             case AV_CODEC_ID_ADPCM_IMA_QT:

  1433.                 sc->samples_per_frame = 64;

  1434.                 sc->bytes_per_frame = 34*st->codec->channels;

  1435.                 break;

  1436.             case AV_CODEC_ID_GSM:

  1437.                 sc->samples_per_frame = 160;

  1438.                 sc->bytes_per_frame = 33;

  1439.                 break;

  1440.             default:

  1441.                 break;

  1442.             }

  1443. 

  1444.             bits_per_sample = av_get_bits_per_sample(st->codec->codec_id);

  1445.             if (bits_per_sample) {

  1446.                 st->codec->bits_per_coded_sample = bits_per_sample;

  1447.                 sc->sample_size = (bits_per_sample >> 3) * st->codec->channels;

  1448.             }

  1449.         } else if (st->codec->codec_type==AVMEDIA_TYPE_SUBTITLE){

  1450.             // ttxt stsd contains display flags, justification, background

  1451.             // color, fonts, and default styles, so fake an atom to read it

  1452.             MOVAtom fake_atom = { .size = size - (avio_tell(pb) - start_pos) };

  1453.             if (format != AV_RL32("mp4s")) // mp4s contains a regular esds atom

  1454.                 mov_read_glbl(c, pb, fake_atom);

  1455.             st->codec->codec_id= id;

  1456.             st->codec->width = sc->width;

  1457.             st->codec->height = sc->height;

  1458.         } else {

  1459.             if (st->codec->codec_tag == MKTAG('t','m','c','d')) {

  1460.                 MOVStreamContext *tmcd_ctx = st->priv_data;

  1461.                 int val;

  1462.                 avio_rb32(pb);       /* reserved */

  1463.                 val = avio_rb32(pb); /* flags */

  1464.                 tmcd_ctx->tmcd_flags = val;

  1465.                 if (val & 1)

  1466.                     st->codec->flags2 |= CODEC_FLAG2_DROP_FRAME_TIMECODE;

  1467.                 avio_rb32(pb); /* time scale */

  1468.                 avio_rb32(pb); /* frame duration */

  1469.                 st->codec->time_base.den = avio_r8(pb); /* number of frame */

  1470.                 st->codec->time_base.num = 1;

  1471.             }

  1472.             /* other codec type, just skip (rtp, mp4s, ...) */

  1473.             avio_skip(pb, size - (avio_tell(pb) - start_pos));

  1474.         }

  1475.         /* this will read extra atoms at the end (wave, alac, damr, avcC, SMI ...) */

  1476.         a.size = size - (avio_tell(pb) - start_pos);

  1477.         if (a.size > 8) {

  1478.             int ret;

  1479.             if ((ret = mov_read_default(c, pb, a)) < 0)

  1480.                 return ret;

  1481.         } else if (a.size > 0)

  1482.             avio_skip(pb, a.size);

  1483.     }

  1484. 

  1485.     if (pb->eof_reached)

  1486.         return AVERROR_EOF;

  1487. 

  1488.     if (st->codec->codec_type==AVMEDIA_TYPE_AUDIO && st->codec->sample_rate==0 && sc->time_scale>1)

  1489.         st->codec->sample_rate= sc->time_scale;

  1490. 

  1491.     /* special codec parameters handling */

  1492.     switch (st->codec->codec_id) {

  1493. #if CONFIG_DV_DEMUXER

  1494.     case AV_CODEC_ID_DVAUDIO:

  1495.         c->dv_fctx = avformat_alloc_context();

  1496.         c->dv_demux = avpriv_dv_init_demux(c->dv_fctx);

  1497.         if (!c->dv_demux) {

  1498.             av_log(c->fc, AV_LOG_ERROR, "dv demux context init error\n");

  1499.             return AVERROR(ENOMEM);

  1500.         }

  1501.         sc->dv_audio_container = 1;

  1502.         st->codec->codec_id = AV_CODEC_ID_PCM_S16LE;

  1503.         break;

  1504. #endif

  1505.     /* no ifdef since parameters are always those */

  1506.     case AV_CODEC_ID_QCELP:

  1507.         // force sample rate for qcelp when not stored in mov

  1508.         if (st->codec->codec_tag != MKTAG('Q','c','l','p'))

  1509.             st->codec->sample_rate = 8000;

  1510.         st->codec->channels= 1; /* really needed */

  1511.         break;

  1512.     case AV_CODEC_ID_AMR_NB:

  1513.         st->codec->channels= 1; /* really needed */

  1514.         /* force sample rate for amr, stsd in 3gp does not store sample rate */

  1515.         st->codec->sample_rate = 8000;

  1516.         break;

  1517.     case AV_CODEC_ID_AMR_WB:

  1518.         st->codec->channels    = 1;

  1519.         st->codec->sample_rate = 16000;

  1520.         break;

  1521.     case AV_CODEC_ID_MP2:

  1522.     case AV_CODEC_ID_MP3:

  1523.         st->codec->codec_type = AVMEDIA_TYPE_AUDIO; /* force type after stsd for m1a hdlr */

  1524.         st->need_parsing = AVSTREAM_PARSE_FULL;

  1525.         break;

  1526.     case AV_CODEC_ID_GSM:

  1527.     case AV_CODEC_ID_ADPCM_MS:

  1528.     case AV_CODEC_ID_ADPCM_IMA_WAV:

  1529.     case AV_CODEC_ID_ILBC:

  1530.         st->codec->block_align = sc->bytes_per_frame;

  1531.         break;

  1532.     case AV_CODEC_ID_ALAC:

  1533.         if (st->codec->extradata_size == 36) {

  1534.             st->codec->channels   = AV_RB8 (st->codec->extradata+21);

  1535.             st->codec->sample_rate = AV_RB32(st->codec->extradata+32);

  1536.         }

  1537.         break;

  1538.     case AV_CODEC_ID_AC3:

  1539.         st->need_parsing = AVSTREAM_PARSE_FULL;

  1540.         break;

  1541.     case AV_CODEC_ID_MPEG1VIDEO:

  1542.         st->need_parsing = AVSTREAM_PARSE_FULL;

  1543.         break;

  1544.     case AV_CODEC_ID_VC1:

  1545.         st->need_parsing = AVSTREAM_PARSE_FULL;

  1546.         break;

  1547.     default:

  1548.         break;

  1549.     }

  1550. 

  1551.     return 0;

  1552. }

  1553. 

  1554. static int mov_read_stsd(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1555. {

  1556.     int entries;

  1557. 

  1558.     avio_r8(pb); /* version */

  1559.     avio_rb24(pb); /* flags */

  1560.     entries = avio_rb32(pb);

  1561. 

  1562.     return ff_mov_read_stsd_entries(c, pb, entries);

  1563. }

  1564. 

  1565. static int mov_read_stsc(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1566. {

  1567.     AVStream *st;

  1568.     MOVStreamContext *sc;

  1569.     unsigned int i, entries;

  1570. 

  1571.     if (c->fc->nb_streams < 1)

  1572.         return 0;

  1573.     st = c->fc->streams[c->fc->nb_streams-1];

  1574.     sc = st->priv_data;

  1575. 

  1576.     avio_r8(pb); /* version */

  1577.     avio_rb24(pb); /* flags */

  1578. 

  1579.     entries = avio_rb32(pb);

  1580. 

  1581.     av_dlog(c->fc, "track[%i].stsc.entries = %i\n", c->fc->nb_streams-1, entries);

  1582. 

  1583.     if (!entries)

  1584.         return 0;

  1585.     if (entries >= UINT_MAX / sizeof(*sc->stsc_data))

  1586.         return AVERROR_INVALIDDATA;

  1587.     sc->stsc_data = av_malloc(entries * sizeof(*sc->stsc_data));

  1588.     if (!sc->stsc_data)

  1589.         return AVERROR(ENOMEM);

  1590. 

  1591.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1592.         sc->stsc_data[i].first = avio_rb32(pb);

  1593.         sc->stsc_data[i].count = avio_rb32(pb);

  1594.         sc->stsc_data[i].id = avio_rb32(pb);

  1595.     }

  1596. 

  1597.     sc->stsc_count = i;

  1598. 

  1599.     if (pb->eof_reached)

  1600.         return AVERROR_EOF;

  1601. 

  1602.     return 0;

  1603. }

  1604. 

  1605. static int mov_read_stps(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1606. {

  1607.     AVStream *st;

  1608.     MOVStreamContext *sc;

  1609.     unsigned i, entries;

  1610. 

  1611.     if (c->fc->nb_streams < 1)

  1612.         return 0;

  1613.     st = c->fc->streams[c->fc->nb_streams-1];

  1614.     sc = st->priv_data;

  1615. 

  1616.     avio_rb32(pb); // version + flags

  1617. 

  1618.     entries = avio_rb32(pb);

  1619.     if (entries >= UINT_MAX / sizeof(*sc->stps_data))

  1620.         return AVERROR_INVALIDDATA;

  1621.     sc->stps_data = av_malloc(entries * sizeof(*sc->stps_data));

  1622.     if (!sc->stps_data)

  1623.         return AVERROR(ENOMEM);

  1624. 

  1625.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1626.         sc->stps_data[i] = avio_rb32(pb);

  1627.         //av_dlog(c->fc, "stps %d\n", sc->stps_data[i]);

  1628.     }

  1629. 

  1630.     sc->stps_count = i;

  1631. 

  1632.     if (pb->eof_reached)

  1633.         return AVERROR_EOF;

  1634. 

  1635.     return 0;

  1636. }

  1637. 

  1638. static int mov_read_stss(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1639. {

  1640.     AVStream *st;

  1641.     MOVStreamContext *sc;

  1642.     unsigned int i, entries;

  1643. 

  1644.     if (c->fc->nb_streams < 1)

  1645.         return 0;

  1646.     st = c->fc->streams[c->fc->nb_streams-1];

  1647.     sc = st->priv_data;

  1648. 

  1649.     avio_r8(pb); /* version */

  1650.     avio_rb24(pb); /* flags */

  1651. 

  1652.     entries = avio_rb32(pb);

  1653. 

  1654.     av_dlog(c->fc, "keyframe_count = %d\n", entries);

  1655. 

  1656.     if (!entries)

  1657.     {

  1658.         sc->keyframe_absent = 1;

  1659.         return 0;

  1660.     }

  1661.     if (entries >= UINT_MAX / sizeof(int))

  1662.         return AVERROR_INVALIDDATA;

  1663.     sc->keyframes = av_malloc(entries * sizeof(int));

  1664.     if (!sc->keyframes)

  1665.         return AVERROR(ENOMEM);

  1666. 

  1667.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1668.         sc->keyframes[i] = avio_rb32(pb);

  1669.         //av_dlog(c->fc, "keyframes[]=%d\n", sc->keyframes[i]);

  1670.     }

  1671. 

  1672.     sc->keyframe_count = i;

  1673. 

  1674.     if (pb->eof_reached)

  1675.         return AVERROR_EOF;

  1676. 

  1677.     return 0;

  1678. }

  1679. 

  1680. static int mov_read_stsz(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1681. {

  1682.     AVStream *st;

  1683.     MOVStreamContext *sc;

  1684.     unsigned int i, entries, sample_size, field_size, num_bytes;

  1685.     GetBitContext gb;

  1686.     unsigned char* buf;

  1687. 

  1688.     if (c->fc->nb_streams < 1)

  1689.         return 0;

  1690.     st = c->fc->streams[c->fc->nb_streams-1];

  1691.     sc = st->priv_data;

  1692. 

  1693.     avio_r8(pb); /* version */

  1694.     avio_rb24(pb); /* flags */

  1695. 

  1696.     if (atom.type == MKTAG('s','t','s','z')) {

  1697.         sample_size = avio_rb32(pb);

  1698.         if (!sc->sample_size) /* do not overwrite value computed in stsd */

  1699.             sc->sample_size = sample_size;

  1700.         sc->alt_sample_size = sample_size;

  1701.         field_size = 32;

  1702.     } else {

  1703.         sample_size = 0;

  1704.         avio_rb24(pb); /* reserved */

  1705.         field_size = avio_r8(pb);

  1706.     }

  1707.     entries = avio_rb32(pb);

  1708. 

  1709.     av_dlog(c->fc, "sample_size = %d sample_count = %d\n", sc->sample_size, entries);

  1710. 

  1711.     sc->sample_count = entries;

  1712.     if (sample_size)

  1713.         return 0;

  1714. 

  1715.     if (field_size != 4 && field_size != 8 && field_size != 16 && field_size != 32) {

  1716.         av_log(c->fc, AV_LOG_ERROR, "Invalid sample field size %d\n", field_size);

  1717.         return AVERROR_INVALIDDATA;

  1718.     }

  1719. 

  1720.     if (!entries)

  1721.         return 0;

  1722.     if (entries >= UINT_MAX / sizeof(int) || entries >= (UINT_MAX - 4) / field_size)

  1723.         return AVERROR_INVALIDDATA;

  1724.     sc->sample_sizes = av_malloc(entries * sizeof(int));

  1725.     if (!sc->sample_sizes)

  1726.         return AVERROR(ENOMEM);

  1727. 

  1728.     num_bytes = (entries*field_size+4)>>3;

  1729. 

  1730.     buf = av_malloc(num_bytes+FF_INPUT_BUFFER_PADDING_SIZE);

  1731.     if (!buf) {

  1732.         av_freep(&sc->sample_sizes);

  1733.         return AVERROR(ENOMEM);

  1734.     }

  1735. 

  1736.     if (avio_read(pb, buf, num_bytes) < num_bytes) {

  1737.         av_freep(&sc->sample_sizes);

  1738.         av_free(buf);

  1739.         return AVERROR_INVALIDDATA;

  1740.     }

  1741. 

  1742.     init_get_bits(&gb, buf, 8*num_bytes);

  1743. 

  1744.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1745.         sc->sample_sizes[i] = get_bits_long(&gb, field_size);

  1746.         sc->data_size += sc->sample_sizes[i];

  1747.     }

  1748. 

  1749.     sc->sample_count = i;

  1750. 

  1751.     if (pb->eof_reached)

  1752.         return AVERROR_EOF;

  1753. 

  1754.     av_free(buf);

  1755.     return 0;

  1756. }

  1757. 

  1758. static int mov_read_stts(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1759. {

  1760.     AVStream *st;

  1761.     MOVStreamContext *sc;

  1762.     unsigned int i, entries;

  1763.     int64_t duration=0;

  1764.     int64_t total_sample_count=0;

  1765. 

  1766.     if (c->fc->nb_streams < 1)

  1767.         return 0;

  1768.     st = c->fc->streams[c->fc->nb_streams-1];

  1769.     sc = st->priv_data;

  1770. 

  1771.     avio_r8(pb); /* version */

  1772.     avio_rb24(pb); /* flags */

  1773.     entries = avio_rb32(pb);

  1774. 

  1775.     av_dlog(c->fc, "track[%i].stts.entries = %i\n",

  1776.             c->fc->nb_streams-1, entries);

  1777. 

  1778.     if (entries >= UINT_MAX / sizeof(*sc->stts_data))

  1779.         return -1;

  1780. 

  1781.     sc->stts_data = av_malloc(entries * sizeof(*sc->stts_data));

  1782.     if (!sc->stts_data)

  1783.         return AVERROR(ENOMEM);

  1784. 

  1785.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1786.         int sample_duration;

  1787.         int sample_count;

  1788. 

  1789.         sample_count=avio_rb32(pb);

  1790.         sample_duration = avio_rb32(pb);

  1791.         /* sample_duration < 0 is invalid based on the spec */

  1792.         if (sample_duration < 0) {

  1793.             av_log(c->fc, AV_LOG_ERROR, "Invalid SampleDelta in STTS %d\n", sample_duration);

  1794.             sample_duration = 1;

  1795.         }

  1796.         sc->stts_data[i].count= sample_count;

  1797.         sc->stts_data[i].duration= sample_duration;

  1798. 

  1799.         av_dlog(c->fc, "sample_count=%d, sample_duration=%d\n",

  1800.                 sample_count, sample_duration);

  1801. 

  1802.         duration+=(int64_t)sample_duration*sample_count;

  1803.         total_sample_count+=sample_count;

  1804.     }

  1805. 

  1806.     sc->stts_count = i;

  1807. 

  1808.     if (pb->eof_reached)

  1809.         return AVERROR_EOF;

  1810. 

  1811.     st->nb_frames= total_sample_count;

  1812.     if (duration)

  1813.         st->duration= duration;

  1814.     sc->track_end = duration;

  1815.     return 0;

  1816. }

  1817. 

  1818. static int mov_read_ctts(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1819. {

  1820.     AVStream *st;

  1821.     MOVStreamContext *sc;

  1822.     unsigned int i, entries;

  1823. 

  1824.     if (c->fc->nb_streams < 1)

  1825.         return 0;

  1826.     st = c->fc->streams[c->fc->nb_streams-1];

  1827.     sc = st->priv_data;

  1828. 

  1829.     avio_r8(pb); /* version */

  1830.     avio_rb24(pb); /* flags */

  1831.     entries = avio_rb32(pb);

  1832. 

  1833.     av_dlog(c->fc, "track[%i].ctts.entries = %i\n", c->fc->nb_streams-1, entries);

  1834. 

  1835.     if (!entries)

  1836.         return 0;

  1837.     if (entries >= UINT_MAX / sizeof(*sc->ctts_data))

  1838.         return AVERROR_INVALIDDATA;

  1839.     sc->ctts_data = av_malloc(entries * sizeof(*sc->ctts_data));

  1840.     if (!sc->ctts_data)

  1841.         return AVERROR(ENOMEM);

  1842. 

  1843.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1844.         int count    =avio_rb32(pb);

  1845.         int duration =avio_rb32(pb);

  1846. 

  1847.         sc->ctts_data[i].count   = count;

  1848.         sc->ctts_data[i].duration= duration;

  1849. 

  1850.         av_dlog(c->fc, "count=%d, duration=%d\n",

  1851.                 count, duration);

  1852. 

  1853.         if (FFABS(duration) > (1<<28) && i+2<entries) {

  1854.             av_log(c->fc, AV_LOG_WARNING, "CTTS invalid\n");

  1855.             av_freep(&sc->ctts_data);

  1856.             sc->ctts_count = 0;

  1857.             return 0;

  1858.         }

  1859. 

  1860.         if (duration < 0 && i+2<entries)

  1861.             sc->dts_shift = FFMAX(sc->dts_shift, -duration);

  1862.     }

  1863. 

  1864.     sc->ctts_count = i;

  1865. 

  1866.     if (pb->eof_reached)

  1867.         return AVERROR_EOF;

  1868. 

  1869.     av_dlog(c->fc, "dts shift %d\n", sc->dts_shift);

  1870. 

  1871.     return 0;

  1872. }

  1873. 

  1874. static int mov_read_sbgp(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1875. {

  1876.     AVStream *st;

  1877.     MOVStreamContext *sc;

  1878.     unsigned int i, entries;

  1879.     uint8_t version;

  1880.     uint32_t grouping_type;

  1881. 

  1882.     if (c->fc->nb_streams < 1)

  1883.         return 0;

  1884.     st = c->fc->streams[c->fc->nb_streams-1];

  1885.     sc = st->priv_data;

  1886. 

  1887.     version = avio_r8(pb); /* version */

  1888.     avio_rb24(pb); /* flags */

  1889.     grouping_type = avio_rl32(pb);

  1890.     if (grouping_type != MKTAG( 'r','a','p',' '))

  1891.         return 0; /* only support 'rap ' grouping */

  1892.     if (version == 1)

  1893.         avio_rb32(pb); /* grouping_type_parameter */

  1894. 

  1895.     entries = avio_rb32(pb);

  1896.     if (!entries)

  1897.         return 0;

  1898.     if (entries >= UINT_MAX / sizeof(*sc->rap_group))

  1899.         return AVERROR_INVALIDDATA;

  1900.     sc->rap_group = av_malloc(entries * sizeof(*sc->rap_group));

  1901.     if (!sc->rap_group)

  1902.         return AVERROR(ENOMEM);

  1903. 

  1904.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1905.         sc->rap_group[i].count = avio_rb32(pb); /* sample_count */

  1906.         sc->rap_group[i].index = avio_rb32(pb); /* group_description_index */

  1907.     }

  1908. 

  1909.     sc->rap_group_count = i;

  1910. 

  1911.     return pb->eof_reached ? AVERROR_EOF : 0;

  1912. }

  1913. 

  1914. static void mov_build_index(MOVContext *mov, AVStream *st)

  1915. {

  1916.     MOVStreamContext *sc = st->priv_data;

  1917.     int64_t current_offset;

  1918.     int64_t current_dts = 0;

  1919.     unsigned int stts_index = 0;

  1920.     unsigned int stsc_index = 0;

  1921.     unsigned int stss_index = 0;

  1922.     unsigned int stps_index = 0;

  1923.     unsigned int i, j;

  1924.     uint64_t stream_size = 0;

  1925.     AVIndexEntry *mem;

  1926. 

  1927.     /* adjust first dts according to edit list */

  1928.     if ((sc->empty_duration || sc->start_time) && mov->time_scale > 0) {

  1929.         if (sc->empty_duration)

  1930.             sc->empty_duration = av_rescale(sc->empty_duration, sc->time_scale, mov->time_scale);

  1931.         sc->time_offset = sc->start_time - sc->empty_duration;

  1932.         current_dts = -sc->time_offset;

  1933.         if (sc->ctts_count>0 && sc->stts_count>0 &&

  1934.             sc->ctts_data[0].duration / FFMAX(sc->stts_data[0].duration, 1) > 16) {

  1935.             /* more than 16 frames delay, dts are likely wrong

  1936.                this happens with files created by iMovie */

  1937.             sc->wrong_dts = 1;

  1938.             st->codec->has_b_frames = 1;

  1939.         }

  1940.     }

  1941. 

  1942.     /* only use old uncompressed audio chunk demuxing when stts specifies it */

  1943.     if (!(st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&

  1944.           sc->stts_count == 1 && sc->stts_data[0].duration == 1)) {

  1945.         unsigned int current_sample = 0;

  1946.         unsigned int stts_sample = 0;

  1947.         unsigned int sample_size;

  1948.         unsigned int distance = 0;

  1949.         unsigned int rap_group_index = 0;

  1950.         unsigned int rap_group_sample = 0;

  1951.         int rap_group_present = sc->rap_group_count && sc->rap_group;

  1952.         int key_off = (sc->keyframe_count && sc->keyframes[0] > 0) || (sc->stps_count && sc->stps_data[0] > 0);

  1953. 

  1954.         current_dts -= sc->dts_shift;

  1955. 

  1956.         if (!sc->sample_count || st->nb_index_entries)

  1957.             return;

  1958.         if (sc->sample_count >= UINT_MAX / sizeof(*st->index_entries) - st->nb_index_entries)

  1959.             return;

  1960.         mem = av_realloc(st->index_entries, (st->nb_index_entries + sc->sample_count) * sizeof(*st->index_entries));

  1961.         if (!mem)

  1962.             return;

  1963.         st->index_entries = mem;

  1964.         st->index_entries_allocated_size = (st->nb_index_entries + sc->sample_count) * sizeof(*st->index_entries);

  1965. 

  1966.         for (i = 0; i < sc->chunk_count; i++) {

  1967.             current_offset = sc->chunk_offsets[i];

  1968.             while (stsc_index + 1 < sc->stsc_count &&

  1969.                 i + 1 == sc->stsc_data[stsc_index + 1].first)

  1970.                 stsc_index++;

  1971.             for (j = 0; j < sc->stsc_data[stsc_index].count; j++) {

  1972.                 int keyframe = 0;

  1973.                 if (current_sample >= sc->sample_count) {

  1974.                     av_log(mov->fc, AV_LOG_ERROR, "wrong sample count\n");

  1975.                     return;

  1976.                 }

  1977. 

  1978.                 if (!sc->keyframe_absent && (!sc->keyframe_count || current_sample+key_off == sc->keyframes[stss_index])) {

  1979.                     keyframe = 1;

  1980.                     if (stss_index + 1 < sc->keyframe_count)

  1981.                         stss_index++;

  1982.                 } else if (sc->stps_count && current_sample+key_off == sc->stps_data[stps_index]) {

  1983.                     keyframe = 1;

  1984.                     if (stps_index + 1 < sc->stps_count)

  1985.                         stps_index++;

  1986.                 }

  1987.                 if (rap_group_present && rap_group_index < sc->rap_group_count) {

  1988.                     if (sc->rap_group[rap_group_index].index > 0)

  1989.                         keyframe = 1;

  1990.                     if (++rap_group_sample == sc->rap_group[rap_group_index].count) {

  1991.                         rap_group_sample = 0;

  1992.                         rap_group_index++;

  1993.                     }

  1994.                 }

  1995.                 if (keyframe)

  1996.                     distance = 0;

  1997.                 sample_size = sc->alt_sample_size > 0 ? sc->alt_sample_size : sc->sample_sizes[current_sample];

  1998.                 if (sc->pseudo_stream_id == -1 ||

  1999.                    sc->stsc_data[stsc_index].id - 1 == sc->pseudo_stream_id) {

  2000.                     AVIndexEntry *e = &st->index_entries[st->nb_index_entries++];

  2001.                     e->pos = current_offset;

  2002.                     e->timestamp = current_dts;

  2003.                     e->size = sample_size;

  2004.                     e->min_distance = distance;

  2005.                     e->flags = keyframe ? AVINDEX_KEYFRAME : 0;

  2006.                     av_dlog(mov->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "

  2007.                             "size %d, distance %d, keyframe %d\n", st->index, current_sample,

  2008.                             current_offset, current_dts, sample_size, distance, keyframe);

  2009.                 }

  2010. 

  2011.                 current_offset += sample_size;

  2012.                 stream_size += sample_size;

  2013.                 current_dts += sc->stts_data[stts_index].duration;

  2014.                 distance++;

  2015.                 stts_sample++;

  2016.                 current_sample++;

  2017.                 if (stts_index + 1 < sc->stts_count && stts_sample == sc->stts_data[stts_index].count) {

  2018.                     stts_sample = 0;

  2019.                     stts_index++;

  2020.                 }

  2021.             }

  2022.         }

  2023.         if (st->duration > 0)

  2024.             st->codec->bit_rate = stream_size*8*sc->time_scale/st->duration;

  2025.     } else {

  2026.         unsigned chunk_samples, total = 0;

  2027. 

  2028.         // compute total chunk count

  2029.         for (i = 0; i < sc->stsc_count; i++) {

  2030.             unsigned count, chunk_count;

  2031. 

  2032.             chunk_samples = sc->stsc_data[i].count;

  2033.             if (i != sc->stsc_count - 1 &&

  2034.                 sc->samples_per_frame && chunk_samples % sc->samples_per_frame) {

  2035.                 av_log(mov->fc, AV_LOG_ERROR, "error unaligned chunk\n");

  2036.                 return;

  2037.             }

  2038. 

  2039.             if (sc->samples_per_frame >= 160) { // gsm

  2040.                 count = chunk_samples / sc->samples_per_frame;

  2041.             } else if (sc->samples_per_frame > 1) {

  2042.                 unsigned samples = (1024/sc->samples_per_frame)*sc->samples_per_frame;

  2043.                 count = (chunk_samples+samples-1) / samples;

  2044.             } else {

  2045.                 count = (chunk_samples+1023) / 1024;

  2046.             }

  2047. 

  2048.             if (i < sc->stsc_count - 1)

  2049.                 chunk_count = sc->stsc_data[i+1].first - sc->stsc_data[i].first;

  2050.             else

  2051.                 chunk_count = sc->chunk_count - (sc->stsc_data[i].first - 1);

  2052.             total += chunk_count * count;

  2053.         }

  2054. 

  2055.         av_dlog(mov->fc, "chunk count %d\n", total);

  2056.         if (total >= UINT_MAX / sizeof(*st->index_entries) - st->nb_index_entries)

  2057.             return;

  2058.         mem = av_realloc(st->index_entries, (st->nb_index_entries + total) * sizeof(*st->index_entries));

  2059.         if (!mem)

  2060.             return;

  2061.         st->index_entries = mem;

  2062.         st->index_entries_allocated_size = (st->nb_index_entries + total) * sizeof(*st->index_entries);

  2063. 

  2064.         // populate index

  2065.         for (i = 0; i < sc->chunk_count; i++) {

  2066.             current_offset = sc->chunk_offsets[i];

  2067.             if (stsc_index + 1 < sc->stsc_count &&

  2068.                 i + 1 == sc->stsc_data[stsc_index + 1].first)

  2069.                 stsc_index++;

  2070.             chunk_samples = sc->stsc_data[stsc_index].count;

  2071. 

  2072.             while (chunk_samples > 0) {

  2073.                 AVIndexEntry *e;

  2074.                 unsigned size, samples;

  2075. 

  2076.                 if (sc->samples_per_frame >= 160) { // gsm

  2077.                     samples = sc->samples_per_frame;

  2078.                     size = sc->bytes_per_frame;

  2079.                 } else {

  2080.                     if (sc->samples_per_frame > 1) {

  2081.                         samples = FFMIN((1024 / sc->samples_per_frame)*

  2082.                                         sc->samples_per_frame, chunk_samples);

  2083.                         size = (samples / sc->samples_per_frame) * sc->bytes_per_frame;

  2084.                     } else {

  2085.                         samples = FFMIN(1024, chunk_samples);

  2086.                         size = samples * sc->sample_size;

  2087.                     }

  2088.                 }

  2089. 

  2090.                 if (st->nb_index_entries >= total) {

  2091.                     av_log(mov->fc, AV_LOG_ERROR, "wrong chunk count %d\n", total);

  2092.                     return;

  2093.                 }

  2094.                 e = &st->index_entries[st->nb_index_entries++];

  2095.                 e->pos = current_offset;

  2096.                 e->timestamp = current_dts;

  2097.                 e->size = size;

  2098.                 e->min_distance = 0;

  2099.                 e->flags = AVINDEX_KEYFRAME;

  2100.                 av_dlog(mov->fc, "AVIndex stream %d, chunk %d, offset %"PRIx64", dts %"PRId64", "

  2101.                         "size %d, duration %d\n", st->index, i, current_offset, current_dts,

  2102.                         size, samples);

  2103. 

  2104.                 current_offset += size;

  2105.                 current_dts += samples;

  2106.                 chunk_samples -= samples;

  2107.             }

  2108.         }

  2109.     }

  2110. }

  2111. 

  2112. static int mov_open_dref(AVIOContext **pb, const char *src, MOVDref *ref,

  2113.                          AVIOInterruptCB *int_cb, int use_absolute_path, AVFormatContext *fc)

  2114. {

  2115.     /* try relative path, we do not try the absolute because it can leak information about our

  2116.        system to an attacker */

  2117.     if (ref->nlvl_to > 0 && ref->nlvl_from > 0) {

  2118.         char filename[1024];

  2119.         const char *src_path;

  2120.         int i, l;

  2121. 

  2122.         /* find a source dir */

  2123.         src_path = strrchr(src, '/');

  2124.         if (src_path)

  2125.             src_path++;

  2126.         else

  2127.             src_path = src;

  2128. 

  2129.         /* find a next level down to target */

  2130.         for (i = 0, l = strlen(ref->path) - 1; l >= 0; l--)

  2131.             if (ref->path[l] == '/') {

  2132.                 if (i == ref->nlvl_to - 1)

  2133.                     break;

  2134.                 else

  2135.                     i++;

  2136.             }

  2137. 

  2138.         /* compose filename if next level down to target was found */

  2139.         if (i == ref->nlvl_to - 1 && src_path - src  < sizeof(filename)) {

  2140.             memcpy(filename, src, src_path - src);

  2141.             filename[src_path - src] = 0;

  2142. 

  2143.             for (i = 1; i < ref->nlvl_from; i++)

  2144.                 av_strlcat(filename, "../", 1024);

  2145. 

  2146.             av_strlcat(filename, ref->path + l + 1, 1024);

  2147. 

  2148.             if (!avio_open2(pb, filename, AVIO_FLAG_READ, int_cb, NULL))

  2149.                 return 0;

  2150.         }

  2151.     } else if (use_absolute_path) {

  2152.         av_log(fc, AV_LOG_WARNING, "Using absolute path on user request, "

  2153.                "this is a possible security issue\n");

  2154.         if (!avio_open2(pb, ref->path, AVIO_FLAG_READ, int_cb, NULL))

  2155.             return 0;

  2156.     }

  2157. 

  2158.     return AVERROR(ENOENT);

  2159. }

  2160. 

  2161. static void fix_timescale(MOVContext *c, MOVStreamContext *sc)

  2162. {

  2163.     if (sc->time_scale <= 0) {

  2164.         av_log(c->fc, AV_LOG_WARNING, "stream %d, timescale not set\n", sc->ffindex);

  2165.         sc->time_scale = c->time_scale;

  2166.         if (sc->time_scale <= 0)

  2167.             sc->time_scale = 1;

  2168.     }

  2169. }

  2170. 

  2171. static int mov_read_trak(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2172. {

  2173.     AVStream *st;

  2174.     MOVStreamContext *sc;

  2175.     int ret;

  2176. 

  2177.     st = avformat_new_stream(c->fc, NULL);

  2178.     if (!st) return AVERROR(ENOMEM);

  2179.     st->id = c->fc->nb_streams;

  2180.     sc = av_mallocz(sizeof(MOVStreamContext));

  2181.     if (!sc) return AVERROR(ENOMEM);

  2182. 

  2183.     st->priv_data = sc;

  2184.     st->codec->codec_type = AVMEDIA_TYPE_DATA;

  2185.     sc->ffindex = st->index;

  2186. 

  2187.     if ((ret = mov_read_default(c, pb, atom)) < 0)

  2188.         return ret;

  2189. 

  2190.     /* sanity checks */

  2191.     if (sc->chunk_count && (!sc->stts_count || !sc->stsc_count ||

  2192.                             (!sc->sample_size && !sc->sample_count))) {

  2193.         av_log(c->fc, AV_LOG_ERROR, "stream %d, missing mandatory atoms, broken header\n",

  2194.                st->index);

  2195.         return 0;

  2196.     }

  2197. 

  2198.     fix_timescale(c, sc);

  2199. 

  2200.     avpriv_set_pts_info(st, 64, 1, sc->time_scale);

  2201. 

  2202.     mov_build_index(c, st);

  2203. 

  2204.     if (sc->dref_id-1 < sc->drefs_count && sc->drefs[sc->dref_id-1].path) {

  2205.         MOVDref *dref = &sc->drefs[sc->dref_id - 1];

  2206.         if (mov_open_dref(&sc->pb, c->fc->filename, dref, &c->fc->interrupt_callback,

  2207.             c->use_absolute_path, c->fc) < 0)

  2208.             av_log(c->fc, AV_LOG_ERROR,

  2209.                    "stream %d, error opening alias: path='%s', dir='%s', "

  2210.                    "filename='%s', volume='%s', nlvl_from=%d, nlvl_to=%d\n",

  2211.                    st->index, dref->path, dref->dir, dref->filename,

  2212.                    dref->volume, dref->nlvl_from, dref->nlvl_to);

  2213.     } else

  2214.         sc->pb = c->fc->pb;

  2215. 

  2216.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  2217.         if (!st->sample_aspect_ratio.num &&

  2218.             (st->codec->width != sc->width || st->codec->height != sc->height)) {

  2219.             st->sample_aspect_ratio = av_d2q(((double)st->codec->height * sc->width) /

  2220.                                              ((double)st->codec->width * sc->height), INT_MAX);

  2221.         }

  2222. 

  2223.         if (st->duration > 0)

  2224.             av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,

  2225.                     sc->time_scale*st->nb_frames, st->duration, INT_MAX);

  2226. 

  2227. #if FF_API_R_FRAME_RATE

  2228.         if (sc->stts_count == 1 || (sc->stts_count == 2 && sc->stts_data[1].count == 1))

  2229.             av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den,

  2230.                       sc->time_scale, sc->stts_data[0].duration, INT_MAX);

  2231. #endif

  2232.     }

  2233. 

  2234.     switch (st->codec->codec_id) {

  2235. #if CONFIG_H261_DECODER

  2236.     case AV_CODEC_ID_H261:

  2237. #endif

  2238. #if CONFIG_H263_DECODER

  2239.     case AV_CODEC_ID_H263:

  2240. #endif

  2241. #if CONFIG_MPEG4_DECODER

  2242.     case AV_CODEC_ID_MPEG4:

  2243. #endif

  2244.         st->codec->width = 0; /* let decoder init width/height */

  2245.         st->codec->height= 0;

  2246.         break;

  2247.     }

  2248. 

  2249.     /* Do not need those anymore. */

  2250.     av_freep(&sc->chunk_offsets);

  2251.     av_freep(&sc->stsc_data);

  2252.     av_freep(&sc->sample_sizes);

  2253.     av_freep(&sc->keyframes);

  2254.     av_freep(&sc->stts_data);

  2255.     av_freep(&sc->stps_data);

  2256.     av_freep(&sc->rap_group);

  2257. 

  2258.     return 0;

  2259. }

  2260. 

  2261. static int mov_read_ilst(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2262. {

  2263.     int ret;

  2264.     c->itunes_metadata = 1;

  2265.     ret = mov_read_default(c, pb, atom);

  2266.     c->itunes_metadata = 0;

  2267.     return ret;

  2268. }

  2269. 

  2270. static int mov_read_meta(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2271. {

  2272.     while (atom.size > 8) {

  2273.         uint32_t tag = avio_rl32(pb);

  2274.         atom.size -= 4;

  2275.         if (tag == MKTAG('h','d','l','r')) {

  2276.             avio_seek(pb, -8, SEEK_CUR);

  2277.             atom.size += 8;

  2278.             return mov_read_default(c, pb, atom);

  2279.         }

  2280.     }

  2281.     return 0;

  2282. }

  2283. 

  2284. static int mov_read_tkhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2285. {

  2286.     int i;

  2287.     int width;

  2288.     int height;

  2289.     int64_t disp_transform[2];

  2290.     int display_matrix[3][2];

  2291.     AVStream *st;

  2292.     MOVStreamContext *sc;

  2293.     int version;

  2294. 

  2295.     if (c->fc->nb_streams < 1)

  2296.         return 0;

  2297.     st = c->fc->streams[c->fc->nb_streams-1];

  2298.     sc = st->priv_data;

  2299. 

  2300.     version = avio_r8(pb);

  2301.     avio_rb24(pb); /* flags */

  2302.     /*

  2303.     MOV_TRACK_ENABLED 0x0001

  2304.     MOV_TRACK_IN_MOVIE 0x0002

  2305.     MOV_TRACK_IN_PREVIEW 0x0004

  2306.     MOV_TRACK_IN_POSTER 0x0008

  2307.     */

  2308. 

  2309.     if (version == 1) {

  2310.         avio_rb64(pb);

  2311.         avio_rb64(pb);

  2312.     } else {

  2313.         avio_rb32(pb); /* creation time */

  2314.         avio_rb32(pb); /* modification time */

  2315.     }

  2316.     st->id = (int)avio_rb32(pb); /* track id (NOT 0 !)*/

  2317.     avio_rb32(pb); /* reserved */

  2318. 

  2319.     /* highlevel (considering edits) duration in movie timebase */

  2320.     (version == 1) ? avio_rb64(pb) : avio_rb32(pb);

  2321.     avio_rb32(pb); /* reserved */

  2322.     avio_rb32(pb); /* reserved */

  2323. 

  2324.     avio_rb16(pb); /* layer */

  2325.     avio_rb16(pb); /* alternate group */

  2326.     avio_rb16(pb); /* volume */

  2327.     avio_rb16(pb); /* reserved */

  2328. 

  2329.     //read in the display matrix (outlined in ISO 14496-12, Section 6.2.2)

  2330.     // they're kept in fixed point format through all calculations

  2331.     // ignore u,v,z b/c we don't need the scale factor to calc aspect ratio

  2332.     for (i = 0; i < 3; i++) {

  2333.         display_matrix[i][0] = avio_rb32(pb);   // 16.16 fixed point

  2334.         display_matrix[i][1] = avio_rb32(pb);   // 16.16 fixed point

  2335.         avio_rb32(pb);           // 2.30 fixed point (not used)

  2336.     }

  2337. 

  2338.     width = avio_rb32(pb);       // 16.16 fixed point track width

  2339.     height = avio_rb32(pb);      // 16.16 fixed point track height

  2340.     sc->width = width >> 16;

  2341.     sc->height = height >> 16;

  2342. 

  2343.     //Assign clockwise rotate values based on transform matrix so that

  2344.     //we can compensate for iPhone orientation during capture.

  2345. 

  2346.     if (display_matrix[1][0] == -65536 && display_matrix[0][1] == 65536) {

  2347.          av_dict_set(&st->metadata, "rotate", "90", 0);

  2348.     }

  2349. 

  2350.     if (display_matrix[0][0] == -65536 && display_matrix[1][1] == -65536) {

  2351.          av_dict_set(&st->metadata, "rotate", "180", 0);

  2352.     }

  2353. 

  2354.     if (display_matrix[1][0] == 65536 && display_matrix[0][1] == -65536) {

  2355.          av_dict_set(&st->metadata, "rotate", "270", 0);

  2356.     }

  2357. 

  2358.     // transform the display width/height according to the matrix

  2359.     // skip this if the display matrix is the default identity matrix

  2360.     // or if it is rotating the picture, ex iPhone 3GS

  2361.     // to keep the same scale, use [width height 1<<16]

  2362.     if (width && height &&

  2363.         ((display_matrix[0][0] != 65536  ||

  2364.           display_matrix[1][1] != 65536) &&

  2365.          !display_matrix[0][1] &&

  2366.          !display_matrix[1][0] &&

  2367.          !display_matrix[2][0] && !display_matrix[2][1])) {

  2368.         for (i = 0; i < 2; i++)

  2369.             disp_transform[i] =

  2370.                 (int64_t)  width  * display_matrix[0][i] +

  2371.                 (int64_t)  height * display_matrix[1][i] +

  2372.                 ((int64_t) display_matrix[2][i] << 16);

  2373. 

  2374.         //sample aspect ratio is new width/height divided by old width/height

  2375.         st->sample_aspect_ratio = av_d2q(

  2376.             ((double) disp_transform[0] * height) /

  2377.             ((double) disp_transform[1] * width), INT_MAX);

  2378.     }

  2379.     return 0;

  2380. }

  2381. 

  2382. static int mov_read_tfhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2383. {

  2384.     MOVFragment *frag = &c->fragment;

  2385.     MOVTrackExt *trex = NULL;

  2386.     int flags, track_id, i;

  2387. 

  2388.     avio_r8(pb); /* version */

  2389.     flags = avio_rb24(pb);

  2390. 

  2391.     track_id = avio_rb32(pb);

  2392.     if (!track_id)

  2393.         return AVERROR_INVALIDDATA;

  2394.     frag->track_id = track_id;

  2395.     for (i = 0; i < c->trex_count; i++)

  2396.         if (c->trex_data[i].track_id == frag->track_id) {

  2397.             trex = &c->trex_data[i];

  2398.             break;

  2399.         }

  2400.     if (!trex) {

  2401.         av_log(c->fc, AV_LOG_ERROR, "could not find corresponding trex\n");

  2402.         return AVERROR_INVALIDDATA;

  2403.     }

  2404. 

  2405.     frag->base_data_offset = flags & MOV_TFHD_BASE_DATA_OFFSET ?

  2406.                              avio_rb64(pb) : frag->moof_offset;

  2407.     frag->stsd_id  = flags & MOV_TFHD_STSD_ID ? avio_rb32(pb) : trex->stsd_id;

  2408. 

  2409.     frag->duration = flags & MOV_TFHD_DEFAULT_DURATION ?

  2410.                      avio_rb32(pb) : trex->duration;

  2411.     frag->size     = flags & MOV_TFHD_DEFAULT_SIZE ?

  2412.                      avio_rb32(pb) : trex->size;

  2413.     frag->flags    = flags & MOV_TFHD_DEFAULT_FLAGS ?

  2414.                      avio_rb32(pb) : trex->flags;

  2415.     av_dlog(c->fc, "frag flags 0x%x\n", frag->flags);

  2416.     return 0;

  2417. }

  2418. 

  2419. static int mov_read_chap(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2420. {

  2421.     c->chapter_track = avio_rb32(pb);

  2422.     return 0;

  2423. }

  2424. 

  2425. static int mov_read_trex(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2426. {

  2427.     MOVTrackExt *trex;

  2428. 

  2429.     if ((uint64_t)c->trex_count+1 >= UINT_MAX / sizeof(*c->trex_data))

  2430.         return AVERROR_INVALIDDATA;

  2431.     trex = av_realloc(c->trex_data, (c->trex_count+1)*sizeof(*c->trex_data));

  2432.     if (!trex)

  2433.         return AVERROR(ENOMEM);

  2434. 

  2435.     c->fc->duration = AV_NOPTS_VALUE; // the duration from mvhd is not representing the whole file when fragments are used.

  2436. 

  2437.     c->trex_data = trex;

  2438.     trex = &c->trex_data[c->trex_count++];

  2439.     avio_r8(pb); /* version */

  2440.     avio_rb24(pb); /* flags */

  2441.     trex->track_id = avio_rb32(pb);

  2442.     trex->stsd_id  = avio_rb32(pb);

  2443.     trex->duration = avio_rb32(pb);

  2444.     trex->size     = avio_rb32(pb);

  2445.     trex->flags    = avio_rb32(pb);

  2446.     return 0;

  2447. }

  2448. 

  2449. static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2450. {

  2451.     MOVFragment *frag = &c->fragment;

  2452.     AVStream *st = NULL;

  2453.     MOVStreamContext *sc;

  2454.     MOVStts *ctts_data;

  2455.     uint64_t offset;

  2456.     int64_t dts;

  2457.     int data_offset = 0;

  2458.     unsigned entries, first_sample_flags = frag->flags;

  2459.     int flags, distance, i, found_keyframe = 0;

  2460. 

  2461.     for (i = 0; i < c->fc->nb_streams; i++) {

  2462.         if (c->fc->streams[i]->id == frag->track_id) {

  2463.             st = c->fc->streams[i];

  2464.             break;

  2465.         }

  2466.     }

  2467.     if (!st) {

  2468.         av_log(c->fc, AV_LOG_ERROR, "could not find corresponding track id %d\n", frag->track_id);

  2469.         return AVERROR_INVALIDDATA;

  2470.     }

  2471.     sc = st->priv_data;

  2472.     if (sc->pseudo_stream_id+1 != frag->stsd_id)

  2473.         return 0;

  2474.     avio_r8(pb); /* version */

  2475.     flags = avio_rb24(pb);

  2476.     entries = avio_rb32(pb);

  2477.     av_dlog(c->fc, "flags 0x%x entries %d\n", flags, entries);

  2478. 

  2479.     /* Always assume the presence of composition time offsets.

  2480.      * Without this assumption, for instance, we cannot deal with a track in fragmented movies that meet the following.

  2481.      *  1) in the initial movie, there are no samples.

  2482.      *  2) in the first movie fragment, there is only one sample without composition time offset.

  2483.      *  3) in the subsequent movie fragments, there are samples with composition time offset. */

  2484.     if (!sc->ctts_count && sc->sample_count)

  2485.     {

  2486.         /* Complement ctts table if moov atom doesn't have ctts atom. */

  2487.         ctts_data = av_malloc(sizeof(*sc->ctts_data));

  2488.         if (!ctts_data)

  2489.             return AVERROR(ENOMEM);

  2490.         sc->ctts_data = ctts_data;

  2491.         sc->ctts_data[sc->ctts_count].count = sc->sample_count;

  2492.         sc->ctts_data[sc->ctts_count].duration = 0;

  2493.         sc->ctts_count++;

  2494.     }

  2495.     if ((uint64_t)entries+sc->ctts_count >= UINT_MAX/sizeof(*sc->ctts_data))

  2496.         return AVERROR_INVALIDDATA;

  2497.     ctts_data = av_realloc(sc->ctts_data,

  2498.                            (entries+sc->ctts_count)*sizeof(*sc->ctts_data));

  2499.     if (!ctts_data)

  2500.         return AVERROR(ENOMEM);

  2501.     sc->ctts_data = ctts_data;

  2502. 

  2503.     if (flags & MOV_TRUN_DATA_OFFSET)        data_offset        = avio_rb32(pb);

  2504.     if (flags & MOV_TRUN_FIRST_SAMPLE_FLAGS) first_sample_flags = avio_rb32(pb);

  2505.     dts    = sc->track_end - sc->time_offset;

  2506.     offset = frag->base_data_offset + data_offset;

  2507.     distance = 0;

  2508.     av_dlog(c->fc, "first sample flags 0x%x\n", first_sample_flags);

  2509.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  2510.         unsigned sample_size = frag->size;

  2511.         int sample_flags = i ? frag->flags : first_sample_flags;

  2512.         unsigned sample_duration = frag->duration;

  2513.         int keyframe = 0;

  2514. 

  2515.         if (flags & MOV_TRUN_SAMPLE_DURATION) sample_duration = avio_rb32(pb);

  2516.         if (flags & MOV_TRUN_SAMPLE_SIZE)     sample_size     = avio_rb32(pb);

  2517.         if (flags & MOV_TRUN_SAMPLE_FLAGS)    sample_flags    = avio_rb32(pb);

  2518.         sc->ctts_data[sc->ctts_count].count = 1;

  2519.         sc->ctts_data[sc->ctts_count].duration = (flags & MOV_TRUN_SAMPLE_CTS) ?

  2520.                                                   avio_rb32(pb) : 0;

  2521.         sc->ctts_count++;

  2522.         if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)

  2523.             keyframe = 1;

  2524.         else if (!found_keyframe)

  2525.             keyframe = found_keyframe =

  2526.                 !(sample_flags & (MOV_FRAG_SAMPLE_FLAG_IS_NON_SYNC |

  2527.                                   MOV_FRAG_SAMPLE_FLAG_DEPENDS_YES));

  2528.         if (keyframe)

  2529.             distance = 0;

  2530.         av_add_index_entry(st, offset, dts, sample_size, distance,

  2531.                            keyframe ? AVINDEX_KEYFRAME : 0);

  2532.         av_dlog(c->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "

  2533.                 "size %d, distance %d, keyframe %d\n", st->index, sc->sample_count+i,

  2534.                 offset, dts, sample_size, distance, keyframe);

  2535.         distance++;

  2536.         dts += sample_duration;

  2537.         offset += sample_size;

  2538.         sc->data_size += sample_size;

  2539.     }

  2540. 

  2541.     if (pb->eof_reached)

  2542.         return AVERROR_EOF;

  2543. 

  2544.     frag->moof_offset = offset;

  2545.     st->duration = sc->track_end = dts + sc->time_offset;

  2546.     return 0;

  2547. }

  2548. 

  2549. /* this atom should be null (from specs), but some buggy files put the 'moov' atom inside it... */

  2550. /* like the files created with Adobe Premiere 5.0, for samples see */

  2551. /* http://graphics.tudelft.nl/~wouter/publications/soundtests/ */

  2552. static int mov_read_wide(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2553. {

  2554.     int err;

  2555. 

  2556.     if (atom.size < 8)

  2557.         return 0; /* continue */

  2558.     if (avio_rb32(pb) != 0) { /* 0 sized mdat atom... use the 'wide' atom size */

  2559.         avio_skip(pb, atom.size - 4);

  2560.         return 0;

  2561.     }

  2562.     atom.type = avio_rl32(pb);

  2563.     atom.size -= 8;

  2564.     if (atom.type != MKTAG('m','d','a','t')) {

  2565.         avio_skip(pb, atom.size);

  2566.         return 0;

  2567.     }

  2568.     err = mov_read_mdat(c, pb, atom);

  2569.     return err;

  2570. }

  2571. 

  2572. static int mov_read_cmov(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2573. {

  2574. #if CONFIG_ZLIB

  2575.     AVIOContext ctx;

  2576.     uint8_t *cmov_data;

  2577.     uint8_t *moov_data; /* uncompressed data */

  2578.     long cmov_len, moov_len;

  2579.     int ret = -1;

  2580. 

  2581.     avio_rb32(pb); /* dcom atom */

  2582.     if (avio_rl32(pb) != MKTAG('d','c','o','m'))

  2583.         return AVERROR_INVALIDDATA;

  2584.     if (avio_rl32(pb) != MKTAG('z','l','i','b')) {

  2585.         av_log(c->fc, AV_LOG_ERROR, "unknown compression for cmov atom !\n");

  2586.         return AVERROR_INVALIDDATA;

  2587.     }

  2588.     avio_rb32(pb); /* cmvd atom */

  2589.     if (avio_rl32(pb) != MKTAG('c','m','v','d'))

  2590.         return AVERROR_INVALIDDATA;

  2591.     moov_len = avio_rb32(pb); /* uncompressed size */

  2592.     cmov_len = atom.size - 6 * 4;

  2593. 

  2594.     cmov_data = av_malloc(cmov_len);

  2595.     if (!cmov_data)

  2596.         return AVERROR(ENOMEM);

  2597.     moov_data = av_malloc(moov_len);

  2598.     if (!moov_data) {

  2599.         av_free(cmov_data);

  2600.         return AVERROR(ENOMEM);

  2601.     }

  2602.     avio_read(pb, cmov_data, cmov_len);

  2603.     if (uncompress (moov_data, (uLongf *) &moov_len, (const Bytef *)cmov_data, cmov_len) != Z_OK)

  2604.         goto free_and_return;

  2605.     if (ffio_init_context(&ctx, moov_data, moov_len, 0, NULL, NULL, NULL, NULL) != 0)

  2606.         goto free_and_return;

  2607.     atom.type = MKTAG('m','o','o','v');

  2608.     atom.size = moov_len;

  2609.     ret = mov_read_default(c, &ctx, atom);

  2610. free_and_return:

  2611.     av_free(moov_data);

  2612.     av_free(cmov_data);

  2613.     return ret;

  2614. #else

  2615.     av_log(c->fc, AV_LOG_ERROR, "this file requires zlib support compiled in\n");

  2616.     return AVERROR(ENOSYS);

  2617. #endif

  2618. }

  2619. 

  2620. /* edit list atom */

  2621. static int mov_read_elst(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2622. {

  2623.     MOVStreamContext *sc;

  2624.     int i, edit_count, version, edit_start_index = 0;

  2625.     int unsupported = 0;

  2626. 

  2627.     if (c->fc->nb_streams < 1 || c->ignore_editlist)

  2628.         return 0;

  2629.     sc = c->fc->streams[c->fc->nb_streams-1]->priv_data;

  2630. 

  2631.     version = avio_r8(pb); /* version */

  2632.     avio_rb24(pb); /* flags */

  2633.     edit_count = avio_rb32(pb); /* entries */

  2634. 

  2635.     if ((uint64_t)edit_count*12+8 > atom.size)

  2636.         return AVERROR_INVALIDDATA;

  2637. 

  2638.     av_dlog(c->fc, "track[%i].edit_count = %i\n", c->fc->nb_streams-1, edit_count);

  2639.     for (i=0; i<edit_count; i++){

  2640.         int64_t time;

  2641.         int64_t duration;

  2642.         int rate;

  2643.         if (version == 1) {

  2644.             duration = avio_rb64(pb);

  2645.             time     = avio_rb64(pb);

  2646.         } else {

  2647.             duration = avio_rb32(pb); /* segment duration */

  2648.             time     = (int32_t)avio_rb32(pb); /* media time */

  2649.         }

  2650.         rate = avio_rb32(pb);

  2651.         if (i == 0 && time == -1) {

  2652.             sc->empty_duration = duration;

  2653.             edit_start_index = 1;

  2654.         } else if (i == edit_start_index && time >= 0)

  2655.             sc->start_time = time;

  2656.         else

  2657.             unsupported = 1;

  2658. 

  2659.         av_dlog(c->fc, "duration=%"PRId64" time=%"PRId64" rate=%f\n",

  2660.                 duration, time, rate / 65536.0);

  2661.     }

  2662. 

  2663.     if (unsupported)

  2664.         av_log(c->fc, AV_LOG_WARNING, "multiple edit list entries, "

  2665.                "a/v desync might occur, patch welcome\n");

  2666. 

  2667.     return 0;

  2668. }

  2669. 

  2670. static int mov_read_chan2(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2671. {

  2672.     if (atom.size < 16)

  2673.         return 0;

  2674.     avio_skip(pb, 4);

  2675.     ff_mov_read_chan(c->fc, pb, c->fc->streams[0],  atom.size - 4);

  2676.     return 0;

  2677. }

  2678. 

  2679. static int mov_read_tref(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2680. {

  2681.     uint32_t i, size;

  2682.     MOVStreamContext *sc;

  2683. 

  2684.     if (c->fc->nb_streams < 1)

  2685.         return AVERROR_INVALIDDATA;

  2686.     sc = c->fc->streams[c->fc->nb_streams - 1]->priv_data;

  2687. 

  2688.     size = avio_rb32(pb);

  2689.     if (size < 12)

  2690.         return 0;

  2691. 

  2692.     sc->trefs_count = (size - 4) / 8;

  2693.     sc->trefs = av_malloc(sc->trefs_count * sizeof(*sc->trefs));

  2694.     if (!sc->trefs)

  2695.         return AVERROR(ENOMEM);

  2696. 

  2697.     sc->tref_type = avio_rl32(pb);

  2698.     for (i = 0; i < sc->trefs_count; i++)

  2699.         sc->trefs[i] = avio_rb32(pb);

  2700.     return 0;

  2701. }

  2702. 

  2703. static const MOVParseTableEntry mov_default_parse_table[] = {

  2704. { MKTAG('A','C','L','R'), mov_read_avid },

  2705. { MKTAG('A','P','R','G'), mov_read_avid },

  2706. { MKTAG('A','A','L','P'), mov_read_avid },

  2707. { MKTAG('A','R','E','S'), mov_read_avid },

  2708. { MKTAG('a','v','s','s'), mov_read_avss },

  2709. { MKTAG('c','h','p','l'), mov_read_chpl },

  2710. { MKTAG('c','o','6','4'), mov_read_stco },

  2711. { MKTAG('c','t','t','s'), mov_read_ctts }, /* composition time to sample */

  2712. { MKTAG('d','i','n','f'), mov_read_default },

  2713. { MKTAG('d','r','e','f'), mov_read_dref },

  2714. { MKTAG('e','d','t','s'), mov_read_default },

  2715. { MKTAG('e','l','s','t'), mov_read_elst },

  2716. { MKTAG('e','n','d','a'), mov_read_enda },

  2717. { MKTAG('f','i','e','l'), mov_read_fiel },

  2718. { MKTAG('f','t','y','p'), mov_read_ftyp },

  2719. { MKTAG('g','l','b','l'), mov_read_glbl },

  2720. { MKTAG('h','d','l','r'), mov_read_hdlr },

  2721. { MKTAG('i','l','s','t'), mov_read_ilst },

  2722. { MKTAG('j','p','2','h'), mov_read_jp2h },

  2723. { MKTAG('m','d','a','t'), mov_read_mdat },

  2724. { MKTAG('m','d','h','d'), mov_read_mdhd },

  2725. { MKTAG('m','d','i','a'), mov_read_default },

  2726. { MKTAG('m','e','t','a'), mov_read_meta },

  2727. { MKTAG('m','i','n','f'), mov_read_default },

  2728. { MKTAG('m','o','o','f'), mov_read_moof },

  2729. { MKTAG('m','o','o','v'), mov_read_moov },

  2730. { MKTAG('m','v','e','x'), mov_read_default },

  2731. { MKTAG('m','v','h','d'), mov_read_mvhd },

  2732. { MKTAG('S','M','I',' '), mov_read_svq3 },

  2733. { MKTAG('a','l','a','c'), mov_read_alac }, /* alac specific atom */

  2734. { MKTAG('a','v','c','C'), mov_read_glbl },

  2735. { MKTAG('p','a','s','p'), mov_read_pasp },

  2736. { MKTAG('s','t','b','l'), mov_read_default },

  2737. { MKTAG('s','t','c','o'), mov_read_stco },

  2738. { MKTAG('s','t','p','s'), mov_read_stps },

  2739. { MKTAG('s','t','r','f'), mov_read_strf },

  2740. { MKTAG('s','t','s','c'), mov_read_stsc },

  2741. { MKTAG('s','t','s','d'), mov_read_stsd }, /* sample description */

  2742. { MKTAG('s','t','s','s'), mov_read_stss }, /* sync sample */

  2743. { MKTAG('s','t','s','z'), mov_read_stsz }, /* sample size */

  2744. { MKTAG('s','t','t','s'), mov_read_stts },

  2745. { MKTAG('s','t','z','2'), mov_read_stsz }, /* compact sample size */

  2746. { MKTAG('t','k','h','d'), mov_read_tkhd }, /* track header */

  2747. { MKTAG('t','f','h','d'), mov_read_tfhd }, /* track fragment header */

  2748. { MKTAG('t','r','a','k'), mov_read_trak },

  2749. { MKTAG('t','r','a','f'), mov_read_default },

  2750. { MKTAG('t','r','e','f'), mov_read_tref },

  2751. { MKTAG('c','h','a','p'), mov_read_chap },

  2752. { MKTAG('t','r','e','x'), mov_read_trex },

  2753. { MKTAG('t','r','u','n'), mov_read_trun },

  2754. { MKTAG('u','d','t','a'), mov_read_default },

  2755. { MKTAG('w','a','v','e'), mov_read_wave },

  2756. { MKTAG('e','s','d','s'), mov_read_esds },

  2757. { MKTAG('d','a','c','3'), mov_read_dac3 }, /* AC-3 info */

  2758. { MKTAG('d','e','c','3'), mov_read_dec3 }, /* EAC-3 info */

  2759. { MKTAG('w','i','d','e'), mov_read_wide }, /* place holder */

  2760. { MKTAG('w','f','e','x'), mov_read_wfex },

  2761. { MKTAG('c','m','o','v'), mov_read_cmov },

  2762. { MKTAG('c','h','a','n'), mov_read_chan }, /* channel layout */

  2763. { MKTAG('d','v','c','1'), mov_read_dvc1 },

  2764. { MKTAG('s','b','g','p'), mov_read_sbgp },

  2765. { 0, NULL }

  2766. };

  2767. 

  2768. static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2769. {

  2770.     int64_t total_size = 0;

  2771.     MOVAtom a;

  2772.     int i;

  2773. 

  2774.     if (atom.size < 0)

  2775.         atom.size = INT64_MAX;

  2776.     while (total_size + 8 <= atom.size && !url_feof(pb)) {

  2777.         int (*parse)(MOVContext*, AVIOContext*, MOVAtom) = NULL;

  2778.         a.size = atom.size;

  2779.         a.type=0;

  2780.         if (atom.size >= 8) {

  2781.             a.size = avio_rb32(pb);

  2782.             a.type = avio_rl32(pb);

  2783.             if (atom.type != MKTAG('r','o','o','t') &&

  2784.                 atom.type != MKTAG('m','o','o','v'))

  2785.             {

  2786.                 if (a.type == MKTAG('t','r','a','k') || a.type == MKTAG('m','d','a','t'))

  2787.                 {

  2788.                     av_log(c->fc, AV_LOG_ERROR, "Broken file, trak/mdat not at top-level\n");

  2789.                     avio_skip(pb, -8);

  2790.                     return 0;

  2791.                 }

  2792.             }

  2793.             total_size += 8;

  2794.             if (a.size == 1) { /* 64 bit extended size */

  2795.                 a.size = avio_rb64(pb) - 8;

  2796.                 total_size += 8;

  2797.             }

  2798.         }

  2799.         av_dlog(c->fc, "type: %08x '%.4s' parent:'%.4s' sz: %"PRId64" %"PRId64" %"PRId64"\n",

  2800.                 a.type, (char*)&a.type, (char*)&atom.type, a.size, total_size, atom.size);

  2801.         if (a.size == 0) {

  2802.             a.size = atom.size - total_size + 8;

  2803.         }

  2804.         a.size -= 8;

  2805.         if (a.size < 0)

  2806.             break;

  2807.         a.size = FFMIN(a.size, atom.size - total_size);

  2808. 

  2809.         for (i = 0; mov_default_parse_table[i].type; i++)

  2810.             if (mov_default_parse_table[i].type == a.type) {

  2811.                 parse = mov_default_parse_table[i].parse;

  2812.                 break;

  2813.             }

  2814. 

  2815.         // container is user data

  2816.         if (!parse && (atom.type == MKTAG('u','d','t','a') ||

  2817.                        atom.type == MKTAG('i','l','s','t')))

  2818.             parse = mov_read_udta_string;

  2819. 

  2820.         if (!parse) { /* skip leaf atoms data */

  2821.             avio_skip(pb, a.size);

  2822.         } else {

  2823.             int64_t start_pos = avio_tell(pb);

  2824.             int64_t left;

  2825.             int err = parse(c, pb, a);

  2826.             if (err < 0)

  2827.                 return err;

  2828.             if (c->found_moov && c->found_mdat &&

  2829.                 ((!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX) ||

  2830.                  start_pos + a.size == avio_size(pb))) {

  2831.                 if (!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX)

  2832.                     c->next_root_atom = start_pos + a.size;

  2833.                 return 0;

  2834.             }

  2835.             left = a.size - avio_tell(pb) + start_pos;

  2836.             if (left > 0) /* skip garbage at atom end */

  2837.                 avio_skip(pb, left);

  2838.             else if(left < 0) {

  2839.                 av_log(c->fc, AV_LOG_DEBUG, "undoing overread of %"PRId64" in '%.4s'\n", -left, (char*)&a.type);

  2840.                 avio_seek(pb, left, SEEK_CUR);

  2841.             }

  2842.         }

  2843. 

  2844.         total_size += a.size;

  2845.     }

  2846. 

  2847.     if (total_size < atom.size && atom.size < 0x7ffff)

  2848.         avio_skip(pb, atom.size - total_size);

  2849. 

  2850.     return 0;

  2851. }

  2852. 

  2853. static int mov_probe(AVProbeData *p)

  2854. {

  2855.     int64_t offset;

  2856.     uint32_t tag;

  2857.     int score = 0;

  2858.     int moov_offset = -1;

  2859. 

  2860.     /* check file header */

  2861.     offset = 0;

  2862.     for (;;) {

  2863.         /* ignore invalid offset */

  2864.         if ((offset + 8) > (unsigned int)p->buf_size)

  2865.             break;

  2866.         tag = AV_RL32(p->buf + offset + 4);

  2867.         switch(tag) {

  2868.         /* check for obvious tags */

  2869.         case MKTAG('m','o','o','v'):

  2870.             moov_offset = offset + 4;

  2871.         case MKTAG('j','P',' ',' '): /* jpeg 2000 signature */

  2872.         case MKTAG('m','d','a','t'):

  2873.         case MKTAG('p','n','o','t'): /* detect movs with preview pics like ew.mov and april.mov */

  2874.         case MKTAG('u','d','t','a'): /* Packet Video PVAuthor adds this and a lot of more junk */

  2875.         case MKTAG('f','t','y','p'):

  2876.             if (AV_RB32(p->buf+offset) < 8 &&

  2877.                 (AV_RB32(p->buf+offset) != 1 ||

  2878.                  offset + 12 > (unsigned int)p->buf_size ||

  2879.                  AV_RB64(p->buf+offset + 8) == 0)) {

  2880.                 score = FFMAX(score, AVPROBE_SCORE_MAX - 50);

  2881.             } else {

  2882.                 score = AVPROBE_SCORE_MAX;

  2883.             }

  2884.             offset = FFMAX(4, AV_RB32(p->buf+offset)) + offset;

  2885.             break;

  2886.         /* those are more common words, so rate then a bit less */

  2887.         case MKTAG('e','d','i','w'): /* xdcam files have reverted first tags */

  2888.         case MKTAG('w','i','d','e'):

  2889.         case MKTAG('f','r','e','e'):

  2890.         case MKTAG('j','u','n','k'):

  2891.         case MKTAG('p','i','c','t'):

  2892.             score  = FFMAX(score, AVPROBE_SCORE_MAX - 5);

  2893.             offset = FFMAX(4, AV_RB32(p->buf+offset)) + offset;

  2894.             break;

  2895.         case MKTAG(0x82,0x82,0x7f,0x7d):

  2896.         case MKTAG('s','k','i','p'):

  2897.         case MKTAG('u','u','i','d'):

  2898.         case MKTAG('p','r','f','l'):

  2899.             /* if we only find those cause probedata is too small at least rate them */

  2900.             score  = FFMAX(score, AVPROBE_SCORE_MAX - 50);

  2901.             offset = FFMAX(4, AV_RB32(p->buf+offset)) + offset;

  2902.             break;

  2903.         default:

  2904.             offset = FFMAX(4, AV_RB32(p->buf+offset)) + offset;

  2905.         }

  2906.     }

  2907.     if(score > AVPROBE_SCORE_MAX - 50 && moov_offset != -1) {

  2908.         /* moov atom in the header - we should make sure that this is not a

  2909.          * MOV-packed MPEG-PS */

  2910.         offset = moov_offset;

  2911. 

  2912.         while(offset < (p->buf_size - 16)){ /* Sufficient space */

  2913.                /* We found an actual hdlr atom */

  2914.             if(AV_RL32(p->buf + offset     ) == MKTAG('h','d','l','r') &&

  2915.                AV_RL32(p->buf + offset +  8) == MKTAG('m','h','l','r') &&

  2916.                AV_RL32(p->buf + offset + 12) == MKTAG('M','P','E','G')){

  2917.                 av_log(NULL, AV_LOG_WARNING, "Found media data tag MPEG indicating this is a MOV-packed MPEG-PS.\n");

  2918.                 /* We found a media handler reference atom describing an

  2919.                  * MPEG-PS-in-MOV, return a

  2920.                  * low score to force expanding the probe window until

  2921.                  * mpegps_probe finds what it needs */

  2922.                 return 5;

  2923.             }else

  2924.                 /* Keep looking */

  2925.                 offset+=2;

  2926.         }

  2927.     }

  2928. 

  2929.     return score;

  2930. }

  2931. 

  2932. // must be done after parsing all trak because there's no order requirement

  2933. static void mov_read_chapters(AVFormatContext *s)

  2934. {

  2935.     MOVContext *mov = s->priv_data;

  2936.     AVStream *st = NULL;

  2937.     MOVStreamContext *sc;

  2938.     int64_t cur_pos;

  2939.     int i;

  2940. 

  2941.     for (i = 0; i < s->nb_streams; i++)

  2942.         if (s->streams[i]->id == mov->chapter_track) {

  2943.             st = s->streams[i];

  2944.             break;

  2945.         }

  2946.     if (!st) {

  2947.         av_log(s, AV_LOG_ERROR, "Referenced QT chapter track not found\n");

  2948.         return;

  2949.     }

  2950. 

  2951.     st->discard = AVDISCARD_ALL;

  2952.     sc = st->priv_data;

  2953.     cur_pos = avio_tell(sc->pb);

  2954. 

  2955.     for (i = 0; i < st->nb_index_entries; i++) {

  2956.         AVIndexEntry *sample = &st->index_entries[i];

  2957.         int64_t end = i+1 < st->nb_index_entries ? st->index_entries[i+1].timestamp : st->duration;

  2958.         uint8_t *title;

  2959.         uint16_t ch;

  2960.         int len, title_len;

  2961. 

  2962.         if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {

  2963.             av_log(s, AV_LOG_ERROR, "Chapter %d not found in file\n", i);

  2964.             goto finish;

  2965.         }

  2966. 

  2967.         // the first two bytes are the length of the title

  2968.         len = avio_rb16(sc->pb);

  2969.         if (len > sample->size-2)

  2970.             continue;

  2971.         title_len = 2*len + 1;

  2972.         if (!(title = av_mallocz(title_len)))

  2973.             goto finish;

  2974. 

  2975.         // The samples could theoretically be in any encoding if there's an encd

  2976.         // atom following, but in practice are only utf-8 or utf-16, distinguished

  2977.         // instead by the presence of a BOM

  2978.         if (!len) {

  2979.             title[0] = 0;

  2980.         } else {

  2981.             ch = avio_rb16(sc->pb);

  2982.             if (ch == 0xfeff)

  2983.                 avio_get_str16be(sc->pb, len, title, title_len);

  2984.             else if (ch == 0xfffe)

  2985.                 avio_get_str16le(sc->pb, len, title, title_len);

  2986.             else {

  2987.                 AV_WB16(title, ch);

  2988.                 if (len == 1 || len == 2)

  2989.                     title[len] = 0;

  2990.                 else

  2991.                     avio_get_str(sc->pb, INT_MAX, title + 2, len - 1);

  2992.             }

  2993.         }

  2994. 

  2995.         avpriv_new_chapter(s, i, st->time_base, sample->timestamp, end, title);

  2996.         av_freep(&title);

  2997.     }

  2998. finish:

  2999.     avio_seek(sc->pb, cur_pos, SEEK_SET);

  3000. }

  3001. 

  3002. static int parse_timecode_in_framenum_format(AVFormatContext *s, AVStream *st,

  3003.                                              uint32_t value, int flags)

  3004. {

  3005.     AVTimecode tc;

  3006.     char buf[AV_TIMECODE_STR_SIZE];

  3007.     AVRational rate = {st->codec->time_base.den,

  3008.                        st->codec->time_base.num};

  3009.     int ret = av_timecode_init(&tc, rate, flags, 0, s);

  3010.     if (ret < 0)

  3011.         return ret;

  3012.     av_dict_set(&st->metadata, "timecode",

  3013.                 av_timecode_make_string(&tc, buf, value), 0);

  3014.     return 0;

  3015. }

  3016. 

  3017. static int mov_read_timecode_track(AVFormatContext *s, AVStream *st)

  3018. {

  3019.     MOVStreamContext *sc = st->priv_data;

  3020.     int flags = 0;

  3021.     int64_t cur_pos = avio_tell(sc->pb);

  3022.     uint32_t value;

  3023. 

  3024.     if (!st->nb_index_entries)

  3025.         return -1;

  3026. 

  3027.     avio_seek(sc->pb, st->index_entries->pos, SEEK_SET);

  3028.     value = avio_rb32(s->pb);

  3029. 

  3030.     if (sc->tmcd_flags & 0x0001) flags |= AV_TIMECODE_FLAG_DROPFRAME;

  3031.     if (sc->tmcd_flags & 0x0002) flags |= AV_TIMECODE_FLAG_24HOURSMAX;

  3032.     if (sc->tmcd_flags & 0x0004) flags |= AV_TIMECODE_FLAG_ALLOWNEGATIVE;

  3033. 

  3034.     /* Assume Counter flag is set to 1 in tmcd track (even though it is likely

  3035.      * not the case) and thus assume "frame number format" instead of QT one.

  3036.      * No sample with tmcd track can be found with a QT timecode at the moment,

  3037.      * despite what the tmcd track "suggests" (Counter flag set to 0 means QT

  3038.      * format). */

  3039.     parse_timecode_in_framenum_format(s, st, value, flags);

  3040. 

  3041.     avio_seek(sc->pb, cur_pos, SEEK_SET);

  3042.     return 0;

  3043. }

  3044. 

  3045. static int mov_read_close(AVFormatContext *s)

  3046. {

  3047.     MOVContext *mov = s->priv_data;

  3048.     int i, j;

  3049. 

  3050.     for (i = 0; i < s->nb_streams; i++) {

  3051.         AVStream *st = s->streams[i];

  3052.         MOVStreamContext *sc = st->priv_data;

  3053. 

  3054.         av_freep(&sc->ctts_data);

  3055.         for (j = 0; j < sc->drefs_count; j++) {

  3056.             av_freep(&sc->drefs[j].path);

  3057.             av_freep(&sc->drefs[j].dir);

  3058.         }

  3059.         av_freep(&sc->drefs);

  3060.         av_freep(&sc->trefs);

  3061.         if (sc->pb && sc->pb != s->pb)

  3062.             avio_close(sc->pb);

  3063.         sc->pb = NULL;

  3064.         av_freep(&sc->chunk_offsets);

  3065.         av_freep(&sc->keyframes);

  3066.         av_freep(&sc->sample_sizes);

  3067.         av_freep(&sc->stps_data);

  3068.         av_freep(&sc->stsc_data);

  3069.         av_freep(&sc->stts_data);

  3070.     }

  3071. 

  3072.     if (mov->dv_demux) {

  3073.         for (i = 0; i < mov->dv_fctx->nb_streams; i++) {

  3074.             av_freep(&mov->dv_fctx->streams[i]->codec);

  3075.             av_freep(&mov->dv_fctx->streams[i]);

  3076.         }

  3077.         av_freep(&mov->dv_fctx);

  3078.         av_freep(&mov->dv_demux);

  3079.     }

  3080. 

  3081.     av_freep(&mov->trex_data);

  3082. 

  3083.     return 0;

  3084. }

  3085. 

  3086. static int tmcd_is_referenced(AVFormatContext *s, int tmcd_id)

  3087. {

  3088.     int i, j;

  3089. 

  3090.     for (i = 0; i < s->nb_streams; i++) {

  3091.         AVStream *st = s->streams[i];

  3092.         MOVStreamContext *sc = st->priv_data;

  3093. 

  3094.         if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_VIDEO)

  3095.             continue;

  3096.         for (j = 0; j < sc->trefs_count; j++)

  3097.             if (tmcd_id == sc->trefs[j])

  3098.                 return 1;

  3099.     }

  3100.     return 0;

  3101. }

  3102. 

  3103. /* look for a tmcd track not referenced by any video track, and export it globally */

  3104. static void export_orphan_timecode(AVFormatContext *s)

  3105. {

  3106.     int i;

  3107. 

  3108.     for (i = 0; i < s->nb_streams; i++) {

  3109.         AVStream *st = s->streams[i];

  3110. 

  3111.         if (st->codec->codec_tag  == MKTAG('t','m','c','d') &&

  3112.             !tmcd_is_referenced(s, i + 1)) {

  3113.             AVDictionaryEntry *tcr = av_dict_get(st->metadata, "timecode", NULL, 0);

  3114.             if (tcr) {

  3115.                 av_dict_set(&s->metadata, "timecode", tcr->value, 0);

  3116.                 break;

  3117.             }

  3118.         }

  3119.     }

  3120. }

  3121. 

  3122. static int mov_read_header(AVFormatContext *s)

  3123. {

  3124.     MOVContext *mov = s->priv_data;

  3125.     AVIOContext *pb = s->pb;

  3126.     int i, err;

  3127.     MOVAtom atom = { AV_RL32("root") };

  3128. 

  3129.     mov->fc = s;

  3130.     /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */

  3131.     if (pb->seekable)

  3132.         atom.size = avio_size(pb);

  3133.     else

  3134.         atom.size = INT64_MAX;

  3135. 

  3136.     /* check MOV header */

  3137.     if ((err = mov_read_default(mov, pb, atom)) < 0) {

  3138.         av_log(s, AV_LOG_ERROR, "error reading header: %d\n", err);

  3139.         mov_read_close(s);

  3140.         return err;

  3141.     }

  3142.     if (!mov->found_moov) {

  3143.         av_log(s, AV_LOG_ERROR, "moov atom not found\n");

  3144.         mov_read_close(s);

  3145.         return AVERROR_INVALIDDATA;

  3146.     }

  3147.     av_dlog(mov->fc, "on_parse_exit_offset=%"PRId64"\n", avio_tell(pb));

  3148. 

  3149.     if (pb->seekable) {

  3150.         if (mov->chapter_track > 0)

  3151.             mov_read_chapters(s);

  3152.         for (i = 0; i < s->nb_streams; i++)

  3153.             if (s->streams[i]->codec->codec_tag == AV_RL32("tmcd"))

  3154.                 mov_read_timecode_track(s, s->streams[i]);

  3155.     }

  3156. 

  3157.     /* copy timecode metadata from tmcd tracks to the related video streams */

  3158.     for (i = 0; i < s->nb_streams; i++) {

  3159.         AVStream *st = s->streams[i];

  3160.         MOVStreamContext *sc = st->priv_data;

  3161.         if (sc->tref_type == AV_RL32("tmcd") && sc->trefs_count) {

  3162.             AVDictionaryEntry *tcr;

  3163.             int tmcd_st_id = sc->trefs[0] - 1;

  3164. 

  3165.             if (tmcd_st_id < 0 || tmcd_st_id >= s->nb_streams)

  3166.                 continue;

  3167.             tcr = av_dict_get(s->streams[tmcd_st_id]->metadata, "timecode", NULL, 0);

  3168.             if (tcr)

  3169.                 av_dict_set(&st->metadata, "timecode", tcr->value, 0);

  3170.         }

  3171.     }

  3172.     export_orphan_timecode(s);

  3173. 

  3174.     for (i = 0; i < s->nb_streams; i++) {

  3175.         AVStream *st = s->streams[i];

  3176.         MOVStreamContext *sc = st->priv_data;

  3177.         fix_timescale(mov, sc);

  3178.         if(st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->codec->codec_id == AV_CODEC_ID_AAC) {

  3179.             st->skip_samples = sc->start_pad;

  3180.         }

  3181.     }

  3182. 

  3183.     if (mov->trex_data) {

  3184.         for (i = 0; i < s->nb_streams; i++) {

  3185.             AVStream *st = s->streams[i];

  3186.             MOVStreamContext *sc = st->priv_data;

  3187.             if (st->duration)

  3188.                 st->codec->bit_rate = sc->data_size * 8 * sc->time_scale / st->duration;

  3189.         }

  3190.     }

  3191. 

  3192.     return 0;

  3193. }

  3194. 

  3195. static AVIndexEntry *mov_find_next_sample(AVFormatContext *s, AVStream **st)

  3196. {

  3197.     AVIndexEntry *sample = NULL;

  3198.     int64_t best_dts = INT64_MAX;

  3199.     int i;

  3200.     for (i = 0; i < s->nb_streams; i++) {

  3201.         AVStream *avst = s->streams[i];

  3202.         MOVStreamContext *msc = avst->priv_data;

  3203.         if (msc->pb && msc->current_sample < avst->nb_index_entries) {

  3204.             AVIndexEntry *current_sample = &avst->index_entries[msc->current_sample];

  3205.             int64_t dts = av_rescale(current_sample->timestamp, AV_TIME_BASE, msc->time_scale);

  3206.             av_dlog(s, "stream %d, sample %d, dts %"PRId64"\n", i, msc->current_sample, dts);

  3207.             if (!sample || (!s->pb->seekable && current_sample->pos < sample->pos) ||

  3208.                 (s->pb->seekable &&

  3209.                  ((msc->pb != s->pb && dts < best_dts) || (msc->pb == s->pb &&

  3210.                  ((FFABS(best_dts - dts) <= AV_TIME_BASE && current_sample->pos < sample->pos) ||

  3211.                   (FFABS(best_dts - dts) > AV_TIME_BASE && dts < best_dts)))))) {

  3212.                 sample = current_sample;

  3213.                 best_dts = dts;

  3214.                 *st = avst;

  3215.             }

  3216.         }

  3217.     }

  3218.     return sample;

  3219. }

  3220. 

  3221. static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)

  3222. {

  3223.     MOVContext *mov = s->priv_data;

  3224.     MOVStreamContext *sc;

  3225.     AVIndexEntry *sample;

  3226.     AVStream *st = NULL;

  3227.     int ret;

  3228.     mov->fc = s;

  3229.  retry:

  3230.     sample = mov_find_next_sample(s, &st);

  3231.     if (!sample) {

  3232.         mov->found_mdat = 0;

  3233.         if (!mov->next_root_atom)

  3234.             return AVERROR_EOF;

  3235.         avio_seek(s->pb, mov->next_root_atom, SEEK_SET);

  3236.         mov->next_root_atom = 0;

  3237.         if (mov_read_default(mov, s->pb, (MOVAtom){ AV_RL32("root"), INT64_MAX }) < 0 ||

  3238.             url_feof(s->pb))

  3239.             return AVERROR_EOF;

  3240.         av_dlog(s, "read fragments, offset 0x%"PRIx64"\n", avio_tell(s->pb));

  3241.         goto retry;

  3242.     }

  3243.     sc = st->priv_data;

  3244.     /* must be done just before reading, to avoid infinite loop on sample */

  3245.     sc->current_sample++;

  3246. 

  3247.     if (st->discard != AVDISCARD_ALL) {

  3248.         if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {

  3249.             av_log(mov->fc, AV_LOG_ERROR, "stream %d, offset 0x%"PRIx64": partial file\n",

  3250.                    sc->ffindex, sample->pos);

  3251.             return AVERROR_INVALIDDATA;

  3252.         }

  3253.         ret = av_get_packet(sc->pb, pkt, sample->size);

  3254.         if (ret < 0)

  3255.             return ret;

  3256.         if (sc->has_palette) {

  3257.             uint8_t *pal;

  3258. 

  3259.             pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);

  3260.             if (!pal) {

  3261.                 av_log(mov->fc, AV_LOG_ERROR, "Cannot append palette to packet\n");

  3262.             } else {

  3263.                 memcpy(pal, sc->palette, AVPALETTE_SIZE);

  3264.                 sc->has_palette = 0;

  3265.             }

  3266.         }

  3267. #if CONFIG_DV_DEMUXER

  3268.         if (mov->dv_demux && sc->dv_audio_container) {

  3269.             avpriv_dv_produce_packet(mov->dv_demux, pkt, pkt->data, pkt->size, pkt->pos);

  3270.             av_free(pkt->data);

  3271.             pkt->size = 0;

  3272.             ret = avpriv_dv_get_packet(mov->dv_demux, pkt);

  3273.             if (ret < 0)

  3274.                 return ret;

  3275.         }

  3276. #endif

  3277.     }

  3278. 

  3279.     pkt->stream_index = sc->ffindex;

  3280.     pkt->dts = sample->timestamp;

  3281.     if (sc->ctts_data && sc->ctts_index < sc->ctts_count) {

  3282.         pkt->pts = pkt->dts + sc->dts_shift + sc->ctts_data[sc->ctts_index].duration;

  3283.         /* update ctts context */

  3284.         sc->ctts_sample++;

  3285.         if (sc->ctts_index < sc->ctts_count &&

  3286.             sc->ctts_data[sc->ctts_index].count == sc->ctts_sample) {

  3287.             sc->ctts_index++;

  3288.             sc->ctts_sample = 0;

  3289.         }

  3290.         if (sc->wrong_dts)

  3291.             pkt->dts = AV_NOPTS_VALUE;

  3292.     } else {

  3293.         int64_t next_dts = (sc->current_sample < st->nb_index_entries) ?

  3294.             st->index_entries[sc->current_sample].timestamp : st->duration;

  3295.         pkt->duration = next_dts - pkt->dts;

  3296.         pkt->pts = pkt->dts;

  3297.     }

  3298.     if (st->discard == AVDISCARD_ALL)

  3299.         goto retry;

  3300.     pkt->flags |= sample->flags & AVINDEX_KEYFRAME ? AV_PKT_FLAG_KEY : 0;

  3301.     pkt->pos = sample->pos;

  3302.     av_dlog(s, "stream %d, pts %"PRId64", dts %"PRId64", pos 0x%"PRIx64", duration %d\n",

  3303.             pkt->stream_index, pkt->pts, pkt->dts, pkt->pos, pkt->duration);

  3304.     return 0;

  3305. }

  3306. 

  3307. static int mov_seek_stream(AVFormatContext *s, AVStream *st, int64_t timestamp, int flags)

  3308. {

  3309.     MOVStreamContext *sc = st->priv_data;

  3310.     int sample, time_sample;

  3311.     int i;

  3312. 

  3313.     sample = av_index_search_timestamp(st, timestamp, flags);

  3314.     av_dlog(s, "stream %d, timestamp %"PRId64", sample %d\n", st->index, timestamp, sample);

  3315.     if (sample < 0 && st->nb_index_entries && timestamp < st->index_entries[0].timestamp)

  3316.         sample = 0;

  3317.     if (sample < 0) /* not sure what to do */

  3318.         return AVERROR_INVALIDDATA;

  3319.     sc->current_sample = sample;

  3320.     av_dlog(s, "stream %d, found sample %d\n", st->index, sc->current_sample);

  3321.     /* adjust ctts index */

  3322.     if (sc->ctts_data) {

  3323.         time_sample = 0;

  3324.         for (i = 0; i < sc->ctts_count; i++) {

  3325.             int next = time_sample + sc->ctts_data[i].count;

  3326.             if (next > sc->current_sample) {

  3327.                 sc->ctts_index = i;

  3328.                 sc->ctts_sample = sc->current_sample - time_sample;

  3329.                 break;

  3330.             }

  3331.             time_sample = next;

  3332.         }

  3333.     }

  3334.     return sample;

  3335. }

  3336. 

  3337. static int mov_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  3338. {

  3339.     AVStream *st;

  3340.     int64_t seek_timestamp, timestamp;

  3341.     int sample;

  3342.     int i;

  3343. 

  3344.     if (stream_index >= s->nb_streams)

  3345.         return AVERROR_INVALIDDATA;

  3346. 

  3347.     st = s->streams[stream_index];

  3348.     sample = mov_seek_stream(s, st, sample_time, flags);

  3349.     if (sample < 0)

  3350.         return sample;

  3351. 

  3352.     /* adjust seek timestamp to found sample timestamp */

  3353.     seek_timestamp = st->index_entries[sample].timestamp;

  3354. 

  3355.     for (i = 0; i < s->nb_streams; i++) {

  3356.         MOVStreamContext *sc = s->streams[i]->priv_data;

  3357.         st = s->streams[i];

  3358.         st->skip_samples = (sample_time <= 0) ? sc->start_pad : 0;

  3359. 

  3360.         if (stream_index == i)

  3361.             continue;

  3362. 

  3363.         timestamp = av_rescale_q(seek_timestamp, s->streams[stream_index]->time_base, st->time_base);

  3364.         mov_seek_stream(s, st, timestamp, flags);

  3365.     }

  3366.     return 0;

  3367. }

  3368. 

  3369. static const AVOption options[] = {

  3370.     {"use_absolute_path",

  3371.         "allow using absolute path when opening alias, this is a possible security issue",

  3372.         offsetof(MOVContext, use_absolute_path), FF_OPT_TYPE_INT, {.i64 = 0},

  3373.         0, 1, AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_DECODING_PARAM},

  3374.     {"ignore_editlist", "", offsetof(MOVContext, ignore_editlist), FF_OPT_TYPE_INT, {.i64 = 0},

  3375.         0, 1, AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_DECODING_PARAM},

  3376.     {NULL}

  3377. };

  3378. 

  3379. static const AVClass class = {

  3380.     .class_name = "mov,mp4,m4a,3gp,3g2,mj2",

  3381.     .item_name  = av_default_item_name,

  3382.     .option     = options,

  3383.     .version    = LIBAVUTIL_VERSION_INT,

  3384. };

  3385. 

  3386. AVInputFormat ff_mov_demuxer = {

  3387.     .name           = "mov,mp4,m4a,3gp,3g2,mj2",

  3388.     .long_name      = NULL_IF_CONFIG_SMALL("QuickTime / MOV"),

  3389.     .priv_data_size = sizeof(MOVContext),

  3390.     .read_probe     = mov_probe,

  3391.     .read_header    = mov_read_header,

  3392.     .read_packet    = mov_read_packet,

  3393.     .read_close     = mov_read_close,

  3394.     .read_seek      = mov_read_seek,

  3395.     .priv_class     = &class,

  3396.     .flags          = AVFMT_NO_BYTE_SEEK,

  3397. };