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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.  * first version by Francois Revol <revol@free.fr>

  7.  * seek function by Gael Chardon <gael.dev@4now.net>

  8.  *

  9.  * This file is part of Libav.

  10.  *

  11.  * Libav is free software; you can redistribute it and/or

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

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

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

  15.  *

  16.  * Libav is distributed in the hope that it will be useful,

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

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

  19.  * Lesser General Public License for more details.

  20.  *

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

  22.  * License along with Libav; if not, write to the Free Software

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

  24.  */

  25. 

  26. #include <limits.h>

  27. 

  28. //#define MOV_EXPORT_ALL_METADATA

  29. 

  30. #include "libavutil/attributes.h"

  31. #include "libavutil/channel_layout.h"

  32. #include "libavutil/intreadwrite.h"

  33. #include "libavutil/intfloat.h"

  34. #include "libavutil/mathematics.h"

  35. #include "libavutil/avstring.h"

  36. #include "libavutil/dict.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. #include "qtpalette.h"

  52. 

  53. 

  54. #undef NDEBUG

  55. #include <assert.h>

  56. 

  57. /* those functions parse an atom */

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

  59. typedef struct MOVParseTableEntry {

  60.     uint32_t type;

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

  62. } MOVParseTableEntry;

  63. 

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

  65. 

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

  67.                                              unsigned len, const char *key)

  68. {

  69.     char buf[16];

  70. 

  71.     short current, total = 0;

  72.     avio_rb16(pb); // unknown

  73.     current = avio_rb16(pb);

  74.     if (len >= 6)

  75.         total = avio_rb16(pb);

  76.     if (!total)

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

  78.     else

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

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

  81. 

  82.     return 0;

  83. }

  84. 

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

  86.                                             unsigned len, const char *key)

  87. {

  88.     char buf[16];

  89. 

  90.     /* bypass padding bytes */

  91.     avio_r8(pb);

  92.     avio_r8(pb);

  93.     avio_r8(pb);

  94. 

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

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

  97. 

  98.     return 0;

  99. }

  100. 

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

  102.                                         unsigned len, const char *key)

  103. {

  104.     char buf[16];

  105. 

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

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

  108. 

  109.     return 0;

  110. }

  111. 

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

  113.                              unsigned len, const char *key)

  114. {

  115.     short genre;

  116.     char buf[20];

  117. 

  118.     avio_r8(pb); // unknown

  119. 

  120.     genre = avio_r8(pb);

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

  122.         return 0;

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

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

  125. 

  126.     return 0;

  127. }

  128. 

  129. static const uint32_t mac_to_unicode[128] = {

  130.     0x00C4,0x00C5,0x00C7,0x00C9,0x00D1,0x00D6,0x00DC,0x00E1,

  131.     0x00E0,0x00E2,0x00E4,0x00E3,0x00E5,0x00E7,0x00E9,0x00E8,

  132.     0x00EA,0x00EB,0x00ED,0x00EC,0x00EE,0x00EF,0x00F1,0x00F3,

  133.     0x00F2,0x00F4,0x00F6,0x00F5,0x00FA,0x00F9,0x00FB,0x00FC,

  134.     0x2020,0x00B0,0x00A2,0x00A3,0x00A7,0x2022,0x00B6,0x00DF,

  135.     0x00AE,0x00A9,0x2122,0x00B4,0x00A8,0x2260,0x00C6,0x00D8,

  136.     0x221E,0x00B1,0x2264,0x2265,0x00A5,0x00B5,0x2202,0x2211,

  137.     0x220F,0x03C0,0x222B,0x00AA,0x00BA,0x03A9,0x00E6,0x00F8,

  138.     0x00BF,0x00A1,0x00AC,0x221A,0x0192,0x2248,0x2206,0x00AB,

  139.     0x00BB,0x2026,0x00A0,0x00C0,0x00C3,0x00D5,0x0152,0x0153,

  140.     0x2013,0x2014,0x201C,0x201D,0x2018,0x2019,0x00F7,0x25CA,

  141.     0x00FF,0x0178,0x2044,0x20AC,0x2039,0x203A,0xFB01,0xFB02,

  142.     0x2021,0x00B7,0x201A,0x201E,0x2030,0x00C2,0x00CA,0x00C1,

  143.     0x00CB,0x00C8,0x00CD,0x00CE,0x00CF,0x00CC,0x00D3,0x00D4,

  144.     0xF8FF,0x00D2,0x00DA,0x00DB,0x00D9,0x0131,0x02C6,0x02DC,

  145.     0x00AF,0x02D8,0x02D9,0x02DA,0x00B8,0x02DD,0x02DB,0x02C7,

  146. };

  147. 

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

  149.                                char *dst, int dstlen)

  150. {

  151.     char *p = dst;

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

  153.     int i;

  154. 

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

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

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

  158.             *p++ = c;

  159.         else

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

  161.     }

  162.     *p = 0;

  163.     return p - dst;

  164. }

  165. 

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

  167. {

  168.     AVPacket pkt;

  169.     AVStream *st;

  170.     MOVStreamContext *sc;

  171.     enum AVCodecID id;

  172.     int ret;

  173. 

  174.     switch (type) {

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

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

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

  178.     default:

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

  180.         avio_skip(pb, len);

  181.         return 0;

  182.     }

  183. 

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

  185.     if (!st)

  186.         return AVERROR(ENOMEM);

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

  188.     if (!sc)

  189.         return AVERROR(ENOMEM);

  190.     st->priv_data = sc;

  191. 

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

  193.     if (ret < 0)

  194.         return ret;

  195. 

  196.     st->disposition              |= AV_DISPOSITION_ATTACHED_PIC;

  197. 

  198.     st->attached_pic              = pkt;

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

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

  201. 

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

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

  204. 

  205.     return 0;

  206. }

  207. 

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

  209. {

  210. #ifdef MOV_EXPORT_ALL_METADATA

  211.     char tmp_key[5];

  212. #endif

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

  214.     const char *key = NULL;

  215.     uint16_t langcode = 0;

  216.     uint32_t data_type = 0, str_size;

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

  218. 

  219.     switch (atom.type) {

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

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

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

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

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

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

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

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

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

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

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

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

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

  233.         parse = mov_metadata_gnre; break;

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

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

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

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

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

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

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

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

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

  243.         parse = mov_metadata_track_or_disc_number; break;

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

  245.         parse = mov_metadata_track_or_disc_number; break;

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

  247.         parse = mov_metadata_int8_bypass_padding; break;

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

  249.         parse = mov_metadata_int8_bypass_padding; break;

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

  251.         parse = mov_metadata_int8_no_padding; break;

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

  253.         parse = mov_metadata_int8_no_padding; break;

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

  255.         parse = mov_metadata_int8_no_padding; break;

  256.     }

  257. 

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

  259.         int data_size = avio_rb32(pb);

  260.         int tag = avio_rl32(pb);

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

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

  263.             avio_rb32(pb); // unknown

  264.             str_size = data_size - 16;

  265.             atom.size -= 16;

  266. 

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

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

  269.                 if (ret < 0) {

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

  271.                     return ret;

  272.                 }

  273.             }

  274.         } else return 0;

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

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

  277.         langcode = avio_rb16(pb);

  278.         ff_mov_lang_to_iso639(langcode, language);

  279.         atom.size -= 4;

  280.     } else

  281.         str_size = atom.size;

  282. 

  283. #ifdef MOV_EXPORT_ALL_METADATA

  284.     if (!key) {

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

  286.         key = tmp_key;

  287.     }

  288. #endif

  289. 

  290.     if (!key)

  291.         return 0;

  292.     if (atom.size < 0)

  293.         return AVERROR_INVALIDDATA;

  294. 

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

  296. 

  297.     if (parse)

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

  299.     else {

  300.         if (data_type == 3 || (data_type == 0 && langcode < 0x800)) { // MAC Encoded

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

  302.         } else {

  303.             avio_read(pb, str, str_size);

  304.             str[str_size] = 0;

  305.         }

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

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

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

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

  310.         }

  311.     }

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

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

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

  315. 

  316.     return 0;

  317. }

  318. 

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

  320. {

  321.     int64_t start;

  322.     int i, nb_chapters, str_len, version;

  323.     char str[256+1];

  324. 

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

  326.         return 0;

  327. 

  328.     version = avio_r8(pb);

  329.     avio_rb24(pb);

  330.     if (version)

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

  332.     nb_chapters = avio_r8(pb);

  333. 

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

  335.         if (atom.size < 9)

  336.             return 0;

  337. 

  338.         start = avio_rb64(pb);

  339.         str_len = avio_r8(pb);

  340. 

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

  342.             return 0;

  343. 

  344.         avio_read(pb, str, str_len);

  345.         str[str_len] = 0;

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

  347.     }

  348.     return 0;

  349. }

  350. 

  351. #define MIN_DATA_ENTRY_BOX_SIZE 12

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

  353. {

  354.     AVStream *st;

  355.     MOVStreamContext *sc;

  356.     int entries, i, j;

  357. 

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

  359.         return 0;

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

  361.     sc = st->priv_data;

  362. 

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

  364.     entries = avio_rb32(pb);

  365.     if (entries >  (atom.size - 1) / MIN_DATA_ENTRY_BOX_SIZE + 1 ||

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

  367.         return AVERROR_INVALIDDATA;

  368.     av_free(sc->drefs);

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

  370.     if (!sc->drefs)

  371.         return AVERROR(ENOMEM);

  372.     sc->drefs_count = entries;

  373. 

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

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

  376.         uint32_t size = avio_rb32(pb);

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

  378. 

  379.         if (size < 12)

  380.             return AVERROR_INVALIDDATA;

  381. 

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

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

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

  385. 

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

  387.             /* macintosh alias record */

  388.             uint16_t volume_len, len;

  389.             int16_t type;

  390. 

  391.             avio_skip(pb, 10);

  392. 

  393.             volume_len = avio_r8(pb);

  394.             volume_len = FFMIN(volume_len, 27);

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

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

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

  398. 

  399.             avio_skip(pb, 12);

  400. 

  401.             len = avio_r8(pb);

  402.             len = FFMIN(len, 63);

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

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

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

  406. 

  407.             avio_skip(pb, 16);

  408. 

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

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

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

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

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

  414. 

  415.             avio_skip(pb, 16);

  416. 

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

  418.                 if (pb->eof_reached)

  419.                     return AVERROR_EOF;

  420.                 type = avio_rb16(pb);

  421.                 len = avio_rb16(pb);

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

  423.                 if (len&1)

  424.                     len += 1;

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

  426.                     av_free(dref->path);

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

  428.                     if (!dref->path)

  429.                         return AVERROR(ENOMEM);

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

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

  432.                         len -= volume_len;

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

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

  435.                     }

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

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

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

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

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

  441.                     av_free(dref->dir);

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

  443.                     if (!dref->dir)

  444.                         return AVERROR(ENOMEM);

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

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

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

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

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

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

  451.                 } else

  452.                     avio_skip(pb, len);

  453.             }

  454.         }

  455.         avio_seek(pb, next, SEEK_SET);

  456.     }

  457.     return 0;

  458. }

  459. 

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

  461. {

  462.     AVStream *st;

  463.     uint32_t type;

  464.     uint32_t av_unused ctype;

  465. 

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

  467.         return 0;

  468. 

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

  470. 

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

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

  473. 

  474.     /* component type */

  475.     ctype = avio_rl32(pb);

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

  477. 

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

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

  480. 

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

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

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

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

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

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

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

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

  489. 

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

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

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

  493. 

  494.     return 0;

  495. }

  496. 

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

  498. {

  499.     AVStream *st;

  500.     int tag;

  501. 

  502.     if (fc->nb_streams < 1)

  503.         return 0;

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

  505. 

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

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

  508.     if (tag == MP4ESDescrTag) {

  509.         ff_mp4_parse_es_descr(pb, NULL);

  510.     } else

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

  512. 

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

  514.     if (tag == MP4DecConfigDescrTag)

  515.         ff_mp4_read_dec_config_descr(fc, st, pb);

  516.     return 0;

  517. }

  518. 

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

  520. {

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

  522. }

  523. 

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

  525. {

  526.     AVStream *st;

  527.     int ac3info, acmod, lfeon, bsmod;

  528. 

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

  530.         return 0;

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

  532. 

  533.     ac3info = avio_rb24(pb);

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

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

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

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

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

  539.     if (lfeon)

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

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

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

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

  544. 

  545.     return 0;

  546. }

  547. 

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

  549. {

  550.     AVStream *st;

  551.     int eac3info, acmod, lfeon, bsmod;

  552. 

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

  554.         return 0;

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

  556. 

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

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

  559.      * does not support them yet. */

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

  561.     eac3info = avio_rb24(pb);

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

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

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

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

  566.     if (lfeon)

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

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

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

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

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

  572. 

  573.     return 0;

  574. }

  575. 

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

  577. {

  578.     AVStream *st;

  579. 

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

  581.         return 0;

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

  583. 

  584.     if (atom.size < 16)

  585.         return 0;

  586. 

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

  588. 

  589.     return 0;

  590. }

  591. 

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

  593. {

  594.     AVStream *st;

  595. 

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

  597.         return 0;

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

  599. 

  600.     ff_get_wav_header(pb, st->codec, atom.size);

  601. 

  602.     return 0;

  603. }

  604. 

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

  606. {

  607.     const int num = avio_rb32(pb);

  608.     const int den = avio_rb32(pb);

  609.     AVStream *st;

  610. 

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

  612.         return 0;

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

  614. 

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

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

  617.         av_log(c->fc, AV_LOG_WARNING,

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

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

  620.                num, den);

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

  622.         st->sample_aspect_ratio.num = num;

  623.         st->sample_aspect_ratio.den = den;

  624.     }

  625.     return 0;

  626. }

  627. 

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

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

  630. {

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

  632.         return 0;

  633.     c->found_mdat=1;

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

  635. }

  636. 

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

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

  639. {

  640.     uint32_t minor_ver;

  641.     int comp_brand_size;

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

  643.     char* comp_brands_str;

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

  645. 

  646.     avio_read(pb, type, 4);

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

  648.         c->isom = 1;

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

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

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

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

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

  654. 

  655.     comp_brand_size = atom.size - 8;

  656.     if (comp_brand_size < 0)

  657.         return AVERROR_INVALIDDATA;

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

  659.     if (!comp_brands_str)

  660.         return AVERROR(ENOMEM);

  661.     avio_read(pb, comp_brands_str, comp_brand_size);

  662.     comp_brands_str[comp_brand_size] = 0;

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

  664.     av_freep(&comp_brands_str);

  665. 

  666.     return 0;

  667. }

  668. 

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

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

  671. {

  672.     int ret;

  673. 

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

  675.         return ret;

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

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

  678.     c->found_moov=1;

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

  680. }

  681. 

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

  683. {

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

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

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

  687. }

  688. 

  689. static void mov_metadata_creation_time(AVDictionary **metadata, time_t time)

  690. {

  691.     char buffer[32];

  692.     if (time) {

  693.         struct tm *ptm;

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

  695.         ptm = gmtime(&time);

  696.         if (!ptm) return;

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

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

  699.     }

  700. }

  701. 

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

  703. {

  704.     AVStream *st;

  705.     MOVStreamContext *sc;

  706.     int version;

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

  708.     unsigned lang;

  709.     time_t creation_time;

  710. 

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

  712.         return 0;

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

  714.     sc = st->priv_data;

  715. 

  716.     if (sc->time_scale) {

  717.         av_log(c->fc, AV_LOG_ERROR, "Multiple mdhd?\n");

  718.         return AVERROR_INVALIDDATA;

  719.     }

  720. 

  721.     version = avio_r8(pb);

  722.     if (version > 1) {

  723.         avpriv_request_sample(c->fc, "Version %d", version);

  724.         return AVERROR_PATCHWELCOME;

  725.     }

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

  727.     if (version == 1) {

  728.         creation_time = avio_rb64(pb);

  729.         avio_rb64(pb);

  730.     } else {

  731.         creation_time = avio_rb32(pb);

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

  733.     }

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

  735. 

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

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

  738. 

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

  740.     if (ff_mov_lang_to_iso639(lang, language))

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

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

  743. 

  744.     return 0;

  745. }

  746. 

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

  748. {

  749.     time_t creation_time;

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

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

  752. 

  753.     if (version == 1) {

  754.         creation_time = avio_rb64(pb);

  755.         avio_rb64(pb);

  756.     } else {

  757.         creation_time = avio_rb32(pb);

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

  759.     }

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

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

  762. 

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

  764. 

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

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

  767. 

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

  769. 

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

  771. 

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

  773. 

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

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

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

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

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

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

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

  781. 

  782.     return 0;

  783. }

  784. 

  785. static int mov_read_smi(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  786. {

  787.     AVStream *st;

  788. 

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

  790.         return 0;

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

  792. 

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

  794.         return AVERROR_INVALIDDATA;

  795. 

  796.     // currently SVQ3 decoder expect full STSD header - so let's fake it

  797.     // this should be fixed and just SMI header should be passed

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

  799.     st->codec->extradata = av_mallocz(atom.size + 0x5a + FF_INPUT_BUFFER_PADDING_SIZE);

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

  801.         return AVERROR(ENOMEM);

  802.     st->codec->extradata_size = 0x5a + atom.size;

  803.     memcpy(st->codec->extradata, "SVQ3", 4); // fake

  804.     avio_read(pb, st->codec->extradata + 0x5a, atom.size);

  805.     av_dlog(c->fc, "Reading SMI %"PRId64"  %s\n", atom.size, st->codec->extradata + 0x5a);

  806.     return 0;

  807. }

  808. 

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

  810. {

  811.     AVStream *st;

  812.     int little_endian;

  813. 

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

  815.         return 0;

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

  817. 

  818.     little_endian = avio_rb16(pb);

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

  820.     if (little_endian == 1) {

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

  822.         case AV_CODEC_ID_PCM_S24BE:

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

  824.             break;

  825.         case AV_CODEC_ID_PCM_S32BE:

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

  827.             break;

  828.         case AV_CODEC_ID_PCM_F32BE:

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

  830.             break;

  831.         case AV_CODEC_ID_PCM_F64BE:

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

  833.             break;

  834.         default:

  835.             break;

  836.         }

  837.     }

  838.     return 0;

  839. }

  840. 

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

  842. {

  843.     AVStream *st;

  844.     unsigned mov_field_order;

  845.     enum AVFieldOrder decoded_field_order = AV_FIELD_UNKNOWN;

  846. 

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

  848.         return 0;

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

  850.     if (atom.size < 2)

  851.         return AVERROR_INVALIDDATA;

  852.     mov_field_order = avio_rb16(pb);

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

  854.         decoded_field_order = AV_FIELD_PROGRESSIVE;

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

  856.         switch (mov_field_order & 0xFF) {

  857.         case 0x01: decoded_field_order = AV_FIELD_TT;

  858.                    break;

  859.         case 0x06: decoded_field_order = AV_FIELD_BB;

  860.                    break;

  861.         case 0x09: decoded_field_order = AV_FIELD_TB;

  862.                    break;

  863.         case 0x0E: decoded_field_order = AV_FIELD_BT;

  864.                    break;

  865.         }

  866.     }

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

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

  869.     }

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

  871. 

  872.     return 0;

  873. }

  874. 

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

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

  877. {

  878.     AVStream *st;

  879.     uint64_t size;

  880.     uint8_t *buf;

  881. 

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

  883.         return 0;

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

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

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

  887.         return AVERROR_INVALIDDATA;

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

  889.     if (!buf)

  890.         return AVERROR(ENOMEM);

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

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

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

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

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

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

  897.     return 0;

  898. }

  899. 

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

  901. {

  902.     AVStream *st;

  903. 

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

  905.         return 0;

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

  907. 

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

  909.         return AVERROR_INVALIDDATA;

  910. 

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

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

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

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

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

  916.             return AVERROR(ENOMEM);

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

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

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

  920.         int ret;

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

  922.             return ret;

  923.     } else

  924.         avio_skip(pb, atom.size);

  925.     return 0;

  926. }

  927. 

  928. /**

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

  930.  * nor size unlike mov_read_extradata.

  931.  */

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

  933. {

  934.     AVStream *st;

  935. 

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

  937.         return 0;

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

  939. 

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

  941.         return AVERROR_INVALIDDATA;

  942. 

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

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

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

  946.         unsigned size = avio_rb32(pb);

  947.         unsigned type = avio_rl32(pb);

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

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

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

  951.     }

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

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

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

  955.         return AVERROR(ENOMEM);

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

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

  958.     return 0;

  959. }

  960. 

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

  962. {

  963.     AVStream *st;

  964.     uint8_t profile_level;

  965. 

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

  967.         return 0;

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

  969. 

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

  971.         return AVERROR_INVALIDDATA;

  972. 

  973.     profile_level = avio_r8(pb);

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

  975.         return 0;

  976. 

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

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

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

  980.         return AVERROR(ENOMEM);

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

  982.     avio_seek(pb, 6, SEEK_CUR);

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

  984.     return 0;

  985. }

  986. 

  987. /**

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

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

  990.  * to the struct.

  991.  */

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

  993. {

  994.     AVStream *st;

  995. 

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

  997.         return 0;

  998.     if (atom.size <= 40)

  999.         return 0;

  1000.     st = c->fc->streams[c->fc->nb_streams-1];

  1001. 

  1002.     if ((uint64_t)atom.size > (1<<30))

  1003.         return AVERROR_INVALIDDATA;

  1004. 

  1005.     av_free(st->codec->extradata);

  1006.     st->codec->extradata = av_mallocz(atom.size - 40 + FF_INPUT_BUFFER_PADDING_SIZE);

  1007.     if (!st->codec->extradata)

  1008.         return AVERROR(ENOMEM);

  1009.     st->codec->extradata_size = atom.size - 40;

  1010.     avio_skip(pb, 40);

  1011.     avio_read(pb, st->codec->extradata, atom.size - 40);

  1012.     return 0;

  1013. }

  1014. 

  1015. static int mov_read_stco(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1016. {

  1017.     AVStream *st;

  1018.     MOVStreamContext *sc;

  1019.     unsigned int i, entries;

  1020. 

  1021.     if (c->fc->nb_streams < 1)

  1022.         return 0;

  1023.     st = c->fc->streams[c->fc->nb_streams-1];

  1024.     sc = st->priv_data;

  1025. 

  1026.     avio_r8(pb); /* version */

  1027.     avio_rb24(pb); /* flags */

  1028. 

  1029.     entries = avio_rb32(pb);

  1030. 

  1031.     if (!entries)

  1032.         return 0;

  1033.     if (entries >= UINT_MAX/sizeof(int64_t))

  1034.         return AVERROR_INVALIDDATA;

  1035. 

  1036.     sc->chunk_offsets = av_malloc(entries * sizeof(int64_t));

  1037.     if (!sc->chunk_offsets)

  1038.         return AVERROR(ENOMEM);

  1039.     sc->chunk_count = entries;

  1040. 

  1041.     if      (atom.type == MKTAG('s','t','c','o'))

  1042.         for (i = 0; i < entries && !pb->eof_reached; i++)

  1043.             sc->chunk_offsets[i] = avio_rb32(pb);

  1044.     else if (atom.type == MKTAG('c','o','6','4'))

  1045.         for (i = 0; i < entries && !pb->eof_reached; i++)

  1046.             sc->chunk_offsets[i] = avio_rb64(pb);

  1047.     else

  1048.         return AVERROR_INVALIDDATA;

  1049. 

  1050.     sc->chunk_count = i;

  1051. 

  1052.     if (pb->eof_reached)

  1053.         return AVERROR_EOF;

  1054. 

  1055.     return 0;

  1056. }

  1057. 

  1058. /**

  1059.  * Compute codec id for 'lpcm' tag.

  1060.  * See CoreAudioTypes and AudioStreamBasicDescription at Apple.

  1061.  */

  1062. enum AVCodecID ff_mov_get_lpcm_codec_id(int bps, int flags)

  1063. {

  1064.     /* lpcm flags:

  1065.      * 0x1 = float

  1066.      * 0x2 = big-endian

  1067.      * 0x4 = signed

  1068.      */

  1069.     return ff_get_pcm_codec_id(bps, flags & 1, flags & 2, flags & 4 ? -1 : 0);

  1070. }

  1071. 

  1072. int ff_mov_read_stsd_entries(MOVContext *c, AVIOContext *pb, int entries)

  1073. {

  1074.     AVStream *st;

  1075.     MOVStreamContext *sc;

  1076.     int j, pseudo_stream_id;

  1077. 

  1078.     if (c->fc->nb_streams < 1)

  1079.         return 0;

  1080.     st = c->fc->streams[c->fc->nb_streams-1];

  1081.     sc = st->priv_data;

  1082. 

  1083.     for (pseudo_stream_id = 0;

  1084.          pseudo_stream_id < entries && !pb->eof_reached;

  1085.          pseudo_stream_id++) {

  1086.         //Parsing Sample description table

  1087.         enum AVCodecID id;

  1088.         int dref_id = 1;

  1089.         MOVAtom a = { AV_RL32("stsd") };

  1090.         int64_t start_pos = avio_tell(pb);

  1091.         uint32_t size = avio_rb32(pb); /* size */

  1092.         uint32_t format = avio_rl32(pb); /* data format */

  1093. 

  1094.         if (size >= 16) {

  1095.             avio_rb32(pb); /* reserved */

  1096.             avio_rb16(pb); /* reserved */

  1097.             dref_id = avio_rb16(pb);

  1098.         } else {

  1099.             av_log(c->fc, AV_LOG_ERROR, "invalid size %d in stsd\n", size);

  1100.             return AVERROR_INVALIDDATA;

  1101.         }

  1102. 

  1103.         if (st->codec->codec_tag &&

  1104.             st->codec->codec_tag != format &&

  1105.             (c->fc->video_codec_id ? ff_codec_get_id(ff_codec_movvideo_tags, format) != c->fc->video_codec_id

  1106.                                    : st->codec->codec_tag != MKTAG('j','p','e','g'))

  1107.            ){

  1108.             /* Multiple fourcc, we skip JPEG. This is not correct, we should

  1109.              * export it as a separate AVStream but this needs a few changes

  1110.              * in the MOV demuxer, patch welcome. */

  1111.         multiple_stsd:

  1112.             av_log(c->fc, AV_LOG_WARNING, "multiple fourcc not supported\n");

  1113.             avio_skip(pb, size - (avio_tell(pb) - start_pos));

  1114.             continue;

  1115.         }

  1116.         /* we cannot demux concatenated h264 streams because of different extradata */

  1117.         if (st->codec->codec_tag && st->codec->codec_tag == AV_RL32("avc1"))

  1118.             goto multiple_stsd;

  1119.         sc->pseudo_stream_id = st->codec->codec_tag ? -1 : pseudo_stream_id;

  1120.         sc->dref_id= dref_id;

  1121. 

  1122.         st->codec->codec_tag = format;

  1123.         id = ff_codec_get_id(ff_codec_movaudio_tags, format);

  1124.         if (id<=0 && ((format&0xFFFF) == 'm'+('s'<<8) || (format&0xFFFF) == 'T'+('S'<<8)))

  1125.             id = ff_codec_get_id(ff_codec_wav_tags, av_bswap32(format)&0xFFFF);

  1126. 

  1127.         if (st->codec->codec_type != AVMEDIA_TYPE_VIDEO && id > 0) {

  1128.             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

  1129.         } else if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO && /* do not overwrite codec type */

  1130.                    format && format != MKTAG('m','p','4','s')) { /* skip old asf mpeg4 tag */

  1131.             id = ff_codec_get_id(ff_codec_movvideo_tags, format);

  1132.             if (id <= 0)

  1133.                 id = ff_codec_get_id(ff_codec_bmp_tags, format);

  1134.             if (id > 0)

  1135.                 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

  1136.             else if (st->codec->codec_type == AVMEDIA_TYPE_DATA){

  1137.                 id = ff_codec_get_id(ff_codec_movsubtitle_tags, format);

  1138.                 if (id > 0)

  1139.                     st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;

  1140.             }

  1141.         }

  1142. 

  1143.         av_dlog(c->fc, "size=%d 4CC= %c%c%c%c codec_type=%d\n", size,

  1144.                 (format >> 0) & 0xff, (format >> 8) & 0xff, (format >> 16) & 0xff,

  1145.                 (format >> 24) & 0xff, st->codec->codec_type);

  1146. 

  1147.         if (st->codec->codec_type==AVMEDIA_TYPE_VIDEO) {

  1148.             unsigned int color_depth, len;

  1149.             int color_greyscale;

  1150.             int color_table_id;

  1151. 

  1152.             st->codec->codec_id = id;

  1153.             avio_rb16(pb); /* version */

  1154.             avio_rb16(pb); /* revision level */

  1155.             avio_rb32(pb); /* vendor */

  1156.             avio_rb32(pb); /* temporal quality */

  1157.             avio_rb32(pb); /* spatial quality */

  1158. 

  1159.             st->codec->width = avio_rb16(pb); /* width */

  1160.             st->codec->height = avio_rb16(pb); /* height */

  1161. 

  1162.             avio_rb32(pb); /* horiz resolution */

  1163.             avio_rb32(pb); /* vert resolution */

  1164.             avio_rb32(pb); /* data size, always 0 */

  1165.             avio_rb16(pb); /* frames per samples */

  1166. 

  1167.             len = avio_r8(pb); /* codec name, pascal string */

  1168.             if (len > 31)

  1169.                 len = 31;

  1170.             mov_read_mac_string(c, pb, len, st->codec->codec_name, 32);

  1171.             if (len < 31)

  1172.                 avio_skip(pb, 31 - len);

  1173.             /* codec_tag YV12 triggers an UV swap in rawdec.c */

  1174.             if (!memcmp(st->codec->codec_name, "Planar Y'CbCr 8-bit 4:2:0", 25))

  1175.                 st->codec->codec_tag=MKTAG('I', '4', '2', '0');

  1176.             /* Flash Media Server uses tag H263 with Sorenson Spark */

  1177.             if (format == MKTAG('H','2','6','3') &&

  1178.                 !memcmp(st->codec->codec_name, "Sorenson H263", 13))

  1179.                 st->codec->codec_id = AV_CODEC_ID_FLV1;

  1180. 

  1181.             st->codec->bits_per_coded_sample = avio_rb16(pb); /* depth */

  1182.             color_table_id = avio_rb16(pb); /* colortable id */

  1183.             av_dlog(c->fc, "depth %d, ctab id %d\n",

  1184.                    st->codec->bits_per_coded_sample, color_table_id);

  1185.             /* figure out the palette situation */

  1186.             color_depth = st->codec->bits_per_coded_sample & 0x1F;

  1187.             color_greyscale = st->codec->bits_per_coded_sample & 0x20;

  1188. 

  1189.             /* if the depth is 2, 4, or 8 bpp, file is palettized */

  1190.             if ((color_depth == 2) || (color_depth == 4) ||

  1191.                 (color_depth == 8)) {

  1192.                 /* for palette traversal */

  1193.                 unsigned int color_start, color_count, color_end;

  1194.                 unsigned char r, g, b;

  1195. 

  1196.                 if (color_greyscale) {

  1197.                     int color_index, color_dec;

  1198.                     /* compute the greyscale palette */

  1199.                     st->codec->bits_per_coded_sample = color_depth;

  1200.                     color_count = 1 << color_depth;

  1201.                     color_index = 255;

  1202.                     color_dec = 256 / (color_count - 1);

  1203.                     for (j = 0; j < color_count; j++) {

  1204.                         r = g = b = color_index;

  1205.                         sc->palette[j] =

  1206.                             (r << 16) | (g << 8) | (b);

  1207.                         color_index -= color_dec;

  1208.                         if (color_index < 0)

  1209.                             color_index = 0;

  1210.                     }

  1211.                 } else if (color_table_id) {

  1212.                     const uint8_t *color_table;

  1213.                     /* if flag bit 3 is set, use the default palette */

  1214.                     color_count = 1 << color_depth;

  1215.                     if (color_depth == 2)

  1216.                         color_table = ff_qt_default_palette_4;

  1217.                     else if (color_depth == 4)

  1218.                         color_table = ff_qt_default_palette_16;

  1219.                     else

  1220.                         color_table = ff_qt_default_palette_256;

  1221. 

  1222.                     for (j = 0; j < color_count; j++) {

  1223.                         r = color_table[j * 3 + 0];

  1224.                         g = color_table[j * 3 + 1];

  1225.                         b = color_table[j * 3 + 2];

  1226.                         sc->palette[j] =

  1227.                             (r << 16) | (g << 8) | (b);

  1228.                     }

  1229.                 } else {

  1230.                     /* load the palette from the file */

  1231.                     color_start = avio_rb32(pb);

  1232.                     color_count = avio_rb16(pb);

  1233.                     color_end = avio_rb16(pb);

  1234.                     if ((color_start <= 255) &&

  1235.                         (color_end <= 255)) {

  1236.                         for (j = color_start; j <= color_end; j++) {

  1237.                             /* each R, G, or B component is 16 bits;

  1238.                              * only use the top 8 bits; skip alpha bytes

  1239.                              * up front */

  1240.                             avio_r8(pb);

  1241.                             avio_r8(pb);

  1242.                             r = avio_r8(pb);

  1243.                             avio_r8(pb);

  1244.                             g = avio_r8(pb);

  1245.                             avio_r8(pb);

  1246.                             b = avio_r8(pb);

  1247.                             avio_r8(pb);

  1248.                             sc->palette[j] =

  1249.                                 (r << 16) | (g << 8) | (b);

  1250.                         }

  1251.                     }

  1252.                 }

  1253.                 sc->has_palette = 1;

  1254.             }

  1255.         } else if (st->codec->codec_type==AVMEDIA_TYPE_AUDIO) {

  1256.             int bits_per_sample, flags;

  1257.             uint16_t version = avio_rb16(pb);

  1258. 

  1259.             st->codec->codec_id = id;

  1260.             avio_rb16(pb); /* revision level */

  1261.             avio_rb32(pb); /* vendor */

  1262. 

  1263.             st->codec->channels = avio_rb16(pb);             /* channel count */

  1264.             av_dlog(c->fc, "audio channels %d\n", st->codec->channels);

  1265.             st->codec->bits_per_coded_sample = avio_rb16(pb);      /* sample size */

  1266. 

  1267.             sc->audio_cid = avio_rb16(pb);

  1268.             avio_rb16(pb); /* packet size = 0 */

  1269. 

  1270.             st->codec->sample_rate = ((avio_rb32(pb) >> 16));

  1271. 

  1272.             //Read QT version 1 fields. In version 0 these do not exist.

  1273.             av_dlog(c->fc, "version =%d, isom =%d\n",version,c->isom);

  1274.             if (!c->isom) {

  1275.                 if (version==1) {

  1276.                     sc->samples_per_frame = avio_rb32(pb);

  1277.                     avio_rb32(pb); /* bytes per packet */

  1278.                     sc->bytes_per_frame = avio_rb32(pb);

  1279.                     avio_rb32(pb); /* bytes per sample */

  1280.                 } else if (version==2) {

  1281.                     avio_rb32(pb); /* sizeof struct only */

  1282.                     st->codec->sample_rate = av_int2double(avio_rb64(pb)); /* float 64 */

  1283.                     st->codec->channels = avio_rb32(pb);

  1284.                     avio_rb32(pb); /* always 0x7F000000 */

  1285.                     st->codec->bits_per_coded_sample = avio_rb32(pb); /* bits per channel if sound is uncompressed */

  1286.                     flags = avio_rb32(pb); /* lpcm format specific flag */

  1287.                     sc->bytes_per_frame = avio_rb32(pb); /* bytes per audio packet if constant */

  1288.                     sc->samples_per_frame = avio_rb32(pb); /* lpcm frames per audio packet if constant */

  1289.                     if (format == MKTAG('l','p','c','m'))

  1290.                         st->codec->codec_id = ff_mov_get_lpcm_codec_id(st->codec->bits_per_coded_sample, flags);

  1291.                 }

  1292.             }

  1293. 

  1294.             switch (st->codec->codec_id) {

  1295.             case AV_CODEC_ID_PCM_S8:

  1296.             case AV_CODEC_ID_PCM_U8:

  1297.                 if (st->codec->bits_per_coded_sample == 16)

  1298.                     st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;

  1299.                 break;

  1300.             case AV_CODEC_ID_PCM_S16LE:

  1301.             case AV_CODEC_ID_PCM_S16BE:

  1302.                 if (st->codec->bits_per_coded_sample == 8)

  1303.                     st->codec->codec_id = AV_CODEC_ID_PCM_S8;

  1304.                 else if (st->codec->bits_per_coded_sample == 24)

  1305.                     st->codec->codec_id =

  1306.                         st->codec->codec_id == AV_CODEC_ID_PCM_S16BE ?

  1307.                         AV_CODEC_ID_PCM_S24BE : AV_CODEC_ID_PCM_S24LE;

  1308.                 break;

  1309.             /* set values for old format before stsd version 1 appeared */

  1310.             case AV_CODEC_ID_MACE3:

  1311.                 sc->samples_per_frame = 6;

  1312.                 sc->bytes_per_frame = 2*st->codec->channels;

  1313.                 break;

  1314.             case AV_CODEC_ID_MACE6:

  1315.                 sc->samples_per_frame = 6;

  1316.                 sc->bytes_per_frame = 1*st->codec->channels;

  1317.                 break;

  1318.             case AV_CODEC_ID_ADPCM_IMA_QT:

  1319.                 sc->samples_per_frame = 64;

  1320.                 sc->bytes_per_frame = 34*st->codec->channels;

  1321.                 break;

  1322.             case AV_CODEC_ID_GSM:

  1323.                 sc->samples_per_frame = 160;

  1324.                 sc->bytes_per_frame = 33;

  1325.                 break;

  1326.             default:

  1327.                 break;

  1328.             }

  1329. 

  1330.             bits_per_sample = av_get_bits_per_sample(st->codec->codec_id);

  1331.             if (bits_per_sample) {

  1332.                 st->codec->bits_per_coded_sample = bits_per_sample;

  1333.                 sc->sample_size = (bits_per_sample >> 3) * st->codec->channels;

  1334.             }

  1335.         } else if (st->codec->codec_type==AVMEDIA_TYPE_SUBTITLE){

  1336.             // ttxt stsd contains display flags, justification, background

  1337.             // color, fonts, and default styles, so fake an atom to read it

  1338.             MOVAtom fake_atom = { .size = size - (avio_tell(pb) - start_pos) };

  1339.             if (format != AV_RL32("mp4s")) // mp4s contains a regular esds atom

  1340.                 mov_read_glbl(c, pb, fake_atom);

  1341.             st->codec->codec_id= id;

  1342.             st->codec->width = sc->width;

  1343.             st->codec->height = sc->height;

  1344.         } else {

  1345.             /* other codec type, just skip (rtp, mp4s, tmcd ...) */

  1346.             avio_skip(pb, size - (avio_tell(pb) - start_pos));

  1347.         }

  1348.         /* this will read extra atoms at the end (wave, alac, damr, avcC, SMI ...) */

  1349.         a.size = size - (avio_tell(pb) - start_pos);

  1350.         if (a.size > 8) {

  1351.             int ret;

  1352.             if ((ret = mov_read_default(c, pb, a)) < 0)

  1353.                 return ret;

  1354.         } else if (a.size > 0)

  1355.             avio_skip(pb, a.size);

  1356.     }

  1357. 

  1358.     if (pb->eof_reached)

  1359.         return AVERROR_EOF;

  1360. 

  1361.     if (st->codec->codec_type==AVMEDIA_TYPE_AUDIO && st->codec->sample_rate==0 && sc->time_scale>1)

  1362.         st->codec->sample_rate= sc->time_scale;

  1363. 

  1364.     /* special codec parameters handling */

  1365.     switch (st->codec->codec_id) {

  1366. #if CONFIG_DV_DEMUXER

  1367.     case AV_CODEC_ID_DVAUDIO:

  1368.         c->dv_fctx = avformat_alloc_context();

  1369.         c->dv_demux = avpriv_dv_init_demux(c->dv_fctx);

  1370.         if (!c->dv_demux) {

  1371.             av_log(c->fc, AV_LOG_ERROR, "dv demux context init error\n");

  1372.             return AVERROR(ENOMEM);

  1373.         }

  1374.         sc->dv_audio_container = 1;

  1375.         st->codec->codec_id = AV_CODEC_ID_PCM_S16LE;

  1376.         break;

  1377. #endif

  1378.     /* no ifdef since parameters are always those */

  1379.     case AV_CODEC_ID_QCELP:

  1380.         // force sample rate for qcelp when not stored in mov

  1381.         if (st->codec->codec_tag != MKTAG('Q','c','l','p'))

  1382.             st->codec->sample_rate = 8000;

  1383.         st->codec->channels= 1; /* really needed */

  1384.         break;

  1385.     case AV_CODEC_ID_AMR_NB:

  1386.         st->codec->channels= 1; /* really needed */

  1387.         /* force sample rate for amr, stsd in 3gp does not store sample rate */

  1388.         st->codec->sample_rate = 8000;

  1389.         break;

  1390.     case AV_CODEC_ID_AMR_WB:

  1391.         st->codec->channels    = 1;

  1392.         st->codec->sample_rate = 16000;

  1393.         break;

  1394.     case AV_CODEC_ID_MP2:

  1395.     case AV_CODEC_ID_MP3:

  1396.         st->codec->codec_type = AVMEDIA_TYPE_AUDIO; /* force type after stsd for m1a hdlr */

  1397.         st->need_parsing = AVSTREAM_PARSE_FULL;

  1398.         break;

  1399.     case AV_CODEC_ID_GSM:

  1400.     case AV_CODEC_ID_ADPCM_MS:

  1401.     case AV_CODEC_ID_ADPCM_IMA_WAV:

  1402.     case AV_CODEC_ID_ILBC:

  1403.         st->codec->block_align = sc->bytes_per_frame;

  1404.         break;

  1405.     case AV_CODEC_ID_ALAC:

  1406.         if (st->codec->extradata_size == 36) {

  1407.             st->codec->channels   = AV_RB8 (st->codec->extradata+21);

  1408.             st->codec->sample_rate = AV_RB32(st->codec->extradata+32);

  1409.         }

  1410.         break;

  1411.     case AV_CODEC_ID_VC1:

  1412.         st->need_parsing = AVSTREAM_PARSE_FULL;

  1413.         break;

  1414.     default:

  1415.         break;

  1416.     }

  1417. 

  1418.     return 0;

  1419. }

  1420. 

  1421. static int mov_read_stsd(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1422. {

  1423.     int entries;

  1424. 

  1425.     avio_r8(pb); /* version */

  1426.     avio_rb24(pb); /* flags */

  1427.     entries = avio_rb32(pb);

  1428. 

  1429.     return ff_mov_read_stsd_entries(c, pb, entries);

  1430. }

  1431. 

  1432. static int mov_read_stsc(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1433. {

  1434.     AVStream *st;

  1435.     MOVStreamContext *sc;

  1436.     unsigned int i, entries;

  1437. 

  1438.     if (c->fc->nb_streams < 1)

  1439.         return 0;

  1440.     st = c->fc->streams[c->fc->nb_streams-1];

  1441.     sc = st->priv_data;

  1442. 

  1443.     avio_r8(pb); /* version */

  1444.     avio_rb24(pb); /* flags */

  1445. 

  1446.     entries = avio_rb32(pb);

  1447. 

  1448.     av_dlog(c->fc, "track[%i].stsc.entries = %i\n", c->fc->nb_streams-1, entries);

  1449. 

  1450.     if (!entries)

  1451.         return 0;

  1452.     if (entries >= UINT_MAX / sizeof(*sc->stsc_data))

  1453.         return AVERROR_INVALIDDATA;

  1454.     sc->stsc_data = av_malloc(entries * sizeof(*sc->stsc_data));

  1455.     if (!sc->stsc_data)

  1456.         return AVERROR(ENOMEM);

  1457. 

  1458.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1459.         sc->stsc_data[i].first = avio_rb32(pb);

  1460.         sc->stsc_data[i].count = avio_rb32(pb);

  1461.         sc->stsc_data[i].id = avio_rb32(pb);

  1462.     }

  1463. 

  1464.     sc->stsc_count = i;

  1465. 

  1466.     if (pb->eof_reached)

  1467.         return AVERROR_EOF;

  1468. 

  1469.     return 0;

  1470. }

  1471. 

  1472. static int mov_read_stps(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1473. {

  1474.     AVStream *st;

  1475.     MOVStreamContext *sc;

  1476.     unsigned i, entries;

  1477. 

  1478.     if (c->fc->nb_streams < 1)

  1479.         return 0;

  1480.     st = c->fc->streams[c->fc->nb_streams-1];

  1481.     sc = st->priv_data;

  1482. 

  1483.     avio_rb32(pb); // version + flags

  1484. 

  1485.     entries = avio_rb32(pb);

  1486.     if (entries >= UINT_MAX / sizeof(*sc->stps_data))

  1487.         return AVERROR_INVALIDDATA;

  1488.     sc->stps_data = av_malloc(entries * sizeof(*sc->stps_data));

  1489.     if (!sc->stps_data)

  1490.         return AVERROR(ENOMEM);

  1491. 

  1492.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1493.         sc->stps_data[i] = avio_rb32(pb);

  1494.         //av_dlog(c->fc, "stps %d\n", sc->stps_data[i]);

  1495.     }

  1496. 

  1497.     sc->stps_count = i;

  1498. 

  1499.     if (pb->eof_reached)

  1500.         return AVERROR_EOF;

  1501. 

  1502.     return 0;

  1503. }

  1504. 

  1505. static int mov_read_stss(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1506. {

  1507.     AVStream *st;

  1508.     MOVStreamContext *sc;

  1509.     unsigned int i, entries;

  1510. 

  1511.     if (c->fc->nb_streams < 1)

  1512.         return 0;

  1513.     st = c->fc->streams[c->fc->nb_streams-1];

  1514.     sc = st->priv_data;

  1515. 

  1516.     avio_r8(pb); /* version */

  1517.     avio_rb24(pb); /* flags */

  1518. 

  1519.     entries = avio_rb32(pb);

  1520. 

  1521.     av_dlog(c->fc, "keyframe_count = %d\n", entries);

  1522. 

  1523.     if (!entries)

  1524.     {

  1525.         sc->keyframe_absent = 1;

  1526.         return 0;

  1527.     }

  1528.     if (entries >= UINT_MAX / sizeof(int))

  1529.         return AVERROR_INVALIDDATA;

  1530.     sc->keyframes = av_malloc(entries * sizeof(int));

  1531.     if (!sc->keyframes)

  1532.         return AVERROR(ENOMEM);

  1533. 

  1534.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1535.         sc->keyframes[i] = avio_rb32(pb);

  1536.         //av_dlog(c->fc, "keyframes[]=%d\n", sc->keyframes[i]);

  1537.     }

  1538. 

  1539.     sc->keyframe_count = i;

  1540. 

  1541.     if (pb->eof_reached)

  1542.         return AVERROR_EOF;

  1543. 

  1544.     return 0;

  1545. }

  1546. 

  1547. static int mov_read_stsz(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1548. {

  1549.     AVStream *st;

  1550.     MOVStreamContext *sc;

  1551.     unsigned int i, entries, sample_size, field_size, num_bytes;

  1552.     GetBitContext gb;

  1553.     unsigned char* buf;

  1554. 

  1555.     if (c->fc->nb_streams < 1)

  1556.         return 0;

  1557.     st = c->fc->streams[c->fc->nb_streams-1];

  1558.     sc = st->priv_data;

  1559. 

  1560.     avio_r8(pb); /* version */

  1561.     avio_rb24(pb); /* flags */

  1562. 

  1563.     if (atom.type == MKTAG('s','t','s','z')) {

  1564.         sample_size = avio_rb32(pb);

  1565.         if (!sc->sample_size) /* do not overwrite value computed in stsd */

  1566.             sc->sample_size = sample_size;

  1567.         field_size = 32;

  1568.     } else {

  1569.         sample_size = 0;

  1570.         avio_rb24(pb); /* reserved */

  1571.         field_size = avio_r8(pb);

  1572.     }

  1573.     entries = avio_rb32(pb);

  1574. 

  1575.     av_dlog(c->fc, "sample_size = %d sample_count = %d\n", sc->sample_size, entries);

  1576. 

  1577.     sc->sample_count = entries;

  1578.     if (sample_size)

  1579.         return 0;

  1580. 

  1581.     if (field_size != 4 && field_size != 8 && field_size != 16 && field_size != 32) {

  1582.         av_log(c->fc, AV_LOG_ERROR, "Invalid sample field size %d\n", field_size);

  1583.         return AVERROR_INVALIDDATA;

  1584.     }

  1585. 

  1586.     if (!entries)

  1587.         return 0;

  1588.     if (entries >= UINT_MAX / sizeof(int) || entries >= (UINT_MAX - 4) / field_size)

  1589.         return AVERROR_INVALIDDATA;

  1590.     sc->sample_sizes = av_malloc(entries * sizeof(int));

  1591.     if (!sc->sample_sizes)

  1592.         return AVERROR(ENOMEM);

  1593. 

  1594.     num_bytes = (entries*field_size+4)>>3;

  1595. 

  1596.     buf = av_malloc(num_bytes+FF_INPUT_BUFFER_PADDING_SIZE);

  1597.     if (!buf) {

  1598.         av_freep(&sc->sample_sizes);

  1599.         return AVERROR(ENOMEM);

  1600.     }

  1601. 

  1602.     if (avio_read(pb, buf, num_bytes) < num_bytes) {

  1603.         av_freep(&sc->sample_sizes);

  1604.         av_free(buf);

  1605.         return AVERROR_INVALIDDATA;

  1606.     }

  1607. 

  1608.     init_get_bits(&gb, buf, 8*num_bytes);

  1609. 

  1610.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1611.         sc->sample_sizes[i] = get_bits_long(&gb, field_size);

  1612.         sc->data_size += sc->sample_sizes[i];

  1613.     }

  1614. 

  1615.     sc->sample_count = i;

  1616. 

  1617.     if (pb->eof_reached)

  1618.         return AVERROR_EOF;

  1619. 

  1620.     av_free(buf);

  1621.     return 0;

  1622. }

  1623. 

  1624. static int mov_read_stts(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1625. {

  1626.     AVStream *st;

  1627.     MOVStreamContext *sc;

  1628.     unsigned int i, entries;

  1629.     int64_t duration=0;

  1630.     int64_t total_sample_count=0;

  1631. 

  1632.     if (c->fc->nb_streams < 1)

  1633.         return 0;

  1634.     st = c->fc->streams[c->fc->nb_streams-1];

  1635.     sc = st->priv_data;

  1636. 

  1637.     avio_r8(pb); /* version */

  1638.     avio_rb24(pb); /* flags */

  1639.     entries = avio_rb32(pb);

  1640. 

  1641.     av_dlog(c->fc, "track[%i].stts.entries = %i\n",

  1642.             c->fc->nb_streams-1, entries);

  1643. 

  1644.     if (!entries)

  1645.         return 0;

  1646.     if (entries >= UINT_MAX / sizeof(*sc->stts_data))

  1647.         return AVERROR(EINVAL);

  1648. 

  1649.     sc->stts_data = av_malloc(entries * sizeof(*sc->stts_data));

  1650.     if (!sc->stts_data)

  1651.         return AVERROR(ENOMEM);

  1652. 

  1653.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1654.         int sample_duration;

  1655.         int sample_count;

  1656. 

  1657.         sample_count=avio_rb32(pb);

  1658.         sample_duration = avio_rb32(pb);

  1659.         sc->stts_data[i].count= sample_count;

  1660.         sc->stts_data[i].duration= sample_duration;

  1661. 

  1662.         av_dlog(c->fc, "sample_count=%d, sample_duration=%d\n",

  1663.                 sample_count, sample_duration);

  1664. 

  1665.         duration+=(int64_t)sample_duration*sample_count;

  1666.         total_sample_count+=sample_count;

  1667.     }

  1668. 

  1669.     sc->stts_count = i;

  1670. 

  1671.     if (pb->eof_reached)

  1672.         return AVERROR_EOF;

  1673. 

  1674.     st->nb_frames= total_sample_count;

  1675.     if (duration)

  1676.         st->duration= duration;

  1677.     sc->track_end = duration;

  1678.     return 0;

  1679. }

  1680. 

  1681. static int mov_read_ctts(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1682. {

  1683.     AVStream *st;

  1684.     MOVStreamContext *sc;

  1685.     unsigned int i, entries;

  1686. 

  1687.     if (c->fc->nb_streams < 1)

  1688.         return 0;

  1689.     st = c->fc->streams[c->fc->nb_streams-1];

  1690.     sc = st->priv_data;

  1691. 

  1692.     avio_r8(pb); /* version */

  1693.     avio_rb24(pb); /* flags */

  1694.     entries = avio_rb32(pb);

  1695. 

  1696.     av_dlog(c->fc, "track[%i].ctts.entries = %i\n", c->fc->nb_streams-1, entries);

  1697. 

  1698.     if (!entries)

  1699.         return 0;

  1700.     if (entries >= UINT_MAX / sizeof(*sc->ctts_data))

  1701.         return AVERROR_INVALIDDATA;

  1702.     sc->ctts_data = av_malloc(entries * sizeof(*sc->ctts_data));

  1703.     if (!sc->ctts_data)

  1704.         return AVERROR(ENOMEM);

  1705. 

  1706.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1707.         int count    =avio_rb32(pb);

  1708.         int duration =avio_rb32(pb);

  1709. 

  1710.         sc->ctts_data[i].count   = count;

  1711.         sc->ctts_data[i].duration= duration;

  1712.         if (duration < 0)

  1713.             sc->dts_shift = FFMAX(sc->dts_shift, -duration);

  1714.     }

  1715. 

  1716.     sc->ctts_count = i;

  1717. 

  1718.     if (pb->eof_reached)

  1719.         return AVERROR_EOF;

  1720. 

  1721.     av_dlog(c->fc, "dts shift %d\n", sc->dts_shift);

  1722. 

  1723.     return 0;

  1724. }

  1725. 

  1726. static int mov_read_sbgp(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1727. {

  1728.     AVStream *st;

  1729.     MOVStreamContext *sc;

  1730.     unsigned int i, entries;

  1731.     uint8_t version;

  1732.     uint32_t grouping_type;

  1733. 

  1734.     if (c->fc->nb_streams < 1)

  1735.         return 0;

  1736.     st = c->fc->streams[c->fc->nb_streams-1];

  1737.     sc = st->priv_data;

  1738. 

  1739.     version = avio_r8(pb); /* version */

  1740.     avio_rb24(pb); /* flags */

  1741.     grouping_type = avio_rl32(pb);

  1742.     if (grouping_type != MKTAG( 'r','a','p',' '))

  1743.         return 0; /* only support 'rap ' grouping */

  1744.     if (version == 1)

  1745.         avio_rb32(pb); /* grouping_type_parameter */

  1746. 

  1747.     entries = avio_rb32(pb);

  1748.     if (!entries)

  1749.         return 0;

  1750.     if (entries >= UINT_MAX / sizeof(*sc->rap_group))

  1751.         return AVERROR_INVALIDDATA;

  1752.     sc->rap_group = av_malloc(entries * sizeof(*sc->rap_group));

  1753.     if (!sc->rap_group)

  1754.         return AVERROR(ENOMEM);

  1755. 

  1756.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1757.         sc->rap_group[i].count = avio_rb32(pb); /* sample_count */

  1758.         sc->rap_group[i].index = avio_rb32(pb); /* group_description_index */

  1759.     }

  1760. 

  1761.     sc->rap_group_count = i;

  1762. 

  1763.     return pb->eof_reached ? AVERROR_EOF : 0;

  1764. }

  1765. 

  1766. static void mov_build_index(MOVContext *mov, AVStream *st)

  1767. {

  1768.     MOVStreamContext *sc = st->priv_data;

  1769.     int64_t current_offset;

  1770.     int64_t current_dts = 0;

  1771.     unsigned int stts_index = 0;

  1772.     unsigned int stsc_index = 0;

  1773.     unsigned int stss_index = 0;

  1774.     unsigned int stps_index = 0;

  1775.     unsigned int i, j;

  1776.     uint64_t stream_size = 0;

  1777.     AVIndexEntry *mem;

  1778. 

  1779.     /* adjust first dts according to edit list */

  1780.     if (sc->time_offset && mov->time_scale > 0) {

  1781.         if (sc->time_offset < 0)

  1782.             sc->time_offset = av_rescale(sc->time_offset, sc->time_scale, mov->time_scale);

  1783.         current_dts = -sc->time_offset;

  1784.         if (sc->ctts_data && sc->stts_data && sc->stts_data[0].duration &&

  1785.             sc->ctts_data[0].duration / sc->stts_data[0].duration > 16) {

  1786.             /* more than 16 frames delay, dts are likely wrong

  1787.                this happens with files created by iMovie */

  1788.             sc->wrong_dts = 1;

  1789.             st->codec->has_b_frames = 1;

  1790.         }

  1791.     }

  1792. 

  1793.     /* only use old uncompressed audio chunk demuxing when stts specifies it */

  1794.     if (!(st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&

  1795.           sc->stts_count == 1 && sc->stts_data[0].duration == 1)) {

  1796.         unsigned int current_sample = 0;

  1797.         unsigned int stts_sample = 0;

  1798.         unsigned int sample_size;

  1799.         unsigned int distance = 0;

  1800.         unsigned int rap_group_index = 0;

  1801.         unsigned int rap_group_sample = 0;

  1802.         int rap_group_present = sc->rap_group_count && sc->rap_group;

  1803.         int key_off = (sc->keyframes && sc->keyframes[0] > 0) || (sc->stps_data && sc->stps_data[0] > 0);

  1804. 

  1805.         current_dts -= sc->dts_shift;

  1806. 

  1807.         if (!sc->sample_count)

  1808.             return;

  1809.         if (sc->sample_count >= UINT_MAX / sizeof(*st->index_entries) - st->nb_index_entries)

  1810.             return;

  1811.         mem = av_realloc(st->index_entries, (st->nb_index_entries + sc->sample_count) * sizeof(*st->index_entries));

  1812.         if (!mem)

  1813.             return;

  1814.         st->index_entries = mem;

  1815.         st->index_entries_allocated_size = (st->nb_index_entries + sc->sample_count) * sizeof(*st->index_entries);

  1816. 

  1817.         for (i = 0; i < sc->chunk_count; i++) {

  1818.             current_offset = sc->chunk_offsets[i];

  1819.             while (stsc_index + 1 < sc->stsc_count &&

  1820.                 i + 1 == sc->stsc_data[stsc_index + 1].first)

  1821.                 stsc_index++;

  1822.             for (j = 0; j < sc->stsc_data[stsc_index].count; j++) {

  1823.                 int keyframe = 0;

  1824.                 if (current_sample >= sc->sample_count) {

  1825.                     av_log(mov->fc, AV_LOG_ERROR, "wrong sample count\n");

  1826.                     return;

  1827.                 }

  1828. 

  1829.                 if (!sc->keyframe_absent && (!sc->keyframe_count || current_sample+key_off == sc->keyframes[stss_index])) {

  1830.                     keyframe = 1;

  1831.                     if (stss_index + 1 < sc->keyframe_count)

  1832.                         stss_index++;

  1833.                 } else if (sc->stps_count && current_sample+key_off == sc->stps_data[stps_index]) {

  1834.                     keyframe = 1;

  1835.                     if (stps_index + 1 < sc->stps_count)

  1836.                         stps_index++;

  1837.                 }

  1838.                 if (rap_group_present && rap_group_index < sc->rap_group_count) {

  1839.                     if (sc->rap_group[rap_group_index].index > 0)

  1840.                         keyframe = 1;

  1841.                     if (++rap_group_sample == sc->rap_group[rap_group_index].count) {

  1842.                         rap_group_sample = 0;

  1843.                         rap_group_index++;

  1844.                     }

  1845.                 }

  1846.                 if (keyframe)

  1847.                     distance = 0;

  1848.                 sample_size = sc->sample_size > 0 ? sc->sample_size : sc->sample_sizes[current_sample];

  1849.                 if (sc->pseudo_stream_id == -1 ||

  1850.                    sc->stsc_data[stsc_index].id - 1 == sc->pseudo_stream_id) {

  1851.                     AVIndexEntry *e = &st->index_entries[st->nb_index_entries++];

  1852.                     e->pos = current_offset;

  1853.                     e->timestamp = current_dts;

  1854.                     e->size = sample_size;

  1855.                     e->min_distance = distance;

  1856.                     e->flags = keyframe ? AVINDEX_KEYFRAME : 0;

  1857.                     av_dlog(mov->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "

  1858.                             "size %d, distance %d, keyframe %d\n", st->index, current_sample,

  1859.                             current_offset, current_dts, sample_size, distance, keyframe);

  1860.                 }

  1861. 

  1862.                 current_offset += sample_size;

  1863.                 stream_size += sample_size;

  1864.                 current_dts += sc->stts_data[stts_index].duration;

  1865.                 distance++;

  1866.                 stts_sample++;

  1867.                 current_sample++;

  1868.                 if (stts_index + 1 < sc->stts_count && stts_sample == sc->stts_data[stts_index].count) {

  1869.                     stts_sample = 0;

  1870.                     stts_index++;

  1871.                 }

  1872.             }

  1873.         }

  1874.         if (st->duration > 0)

  1875.             st->codec->bit_rate = stream_size*8*sc->time_scale/st->duration;

  1876.     } else {

  1877.         unsigned chunk_samples, total = 0;

  1878. 

  1879.         // compute total chunk count

  1880.         for (i = 0; i < sc->stsc_count; i++) {

  1881.             unsigned count, chunk_count;

  1882. 

  1883.             chunk_samples = sc->stsc_data[i].count;

  1884.             if (i != sc->stsc_count - 1 &&

  1885.                 sc->samples_per_frame && chunk_samples % sc->samples_per_frame) {

  1886.                 av_log(mov->fc, AV_LOG_ERROR, "error unaligned chunk\n");

  1887.                 return;

  1888.             }

  1889. 

  1890.             if (sc->samples_per_frame >= 160) { // gsm

  1891.                 count = chunk_samples / sc->samples_per_frame;

  1892.             } else if (sc->samples_per_frame > 1) {

  1893.                 unsigned samples = (1024/sc->samples_per_frame)*sc->samples_per_frame;

  1894.                 count = (chunk_samples+samples-1) / samples;

  1895.             } else {

  1896.                 count = (chunk_samples+1023) / 1024;

  1897.             }

  1898. 

  1899.             if (i < sc->stsc_count - 1)

  1900.                 chunk_count = sc->stsc_data[i+1].first - sc->stsc_data[i].first;

  1901.             else

  1902.                 chunk_count = sc->chunk_count - (sc->stsc_data[i].first - 1);

  1903.             total += chunk_count * count;

  1904.         }

  1905. 

  1906.         av_dlog(mov->fc, "chunk count %d\n", total);

  1907.         if (total >= UINT_MAX / sizeof(*st->index_entries) - st->nb_index_entries)

  1908.             return;

  1909.         mem = av_realloc(st->index_entries, (st->nb_index_entries + total) * sizeof(*st->index_entries));

  1910.         if (!mem)

  1911.             return;

  1912.         st->index_entries = mem;

  1913.         st->index_entries_allocated_size = (st->nb_index_entries + total) * sizeof(*st->index_entries);

  1914. 

  1915.         // populate index

  1916.         for (i = 0; i < sc->chunk_count; i++) {

  1917.             current_offset = sc->chunk_offsets[i];

  1918.             if (stsc_index + 1 < sc->stsc_count &&

  1919.                 i + 1 == sc->stsc_data[stsc_index + 1].first)

  1920.                 stsc_index++;

  1921.             chunk_samples = sc->stsc_data[stsc_index].count;

  1922. 

  1923.             while (chunk_samples > 0) {

  1924.                 AVIndexEntry *e;

  1925.                 unsigned size, samples;

  1926. 

  1927.                 if (sc->samples_per_frame >= 160) { // gsm

  1928.                     samples = sc->samples_per_frame;

  1929.                     size = sc->bytes_per_frame;

  1930.                 } else {

  1931.                     if (sc->samples_per_frame > 1) {

  1932.                         samples = FFMIN((1024 / sc->samples_per_frame)*

  1933.                                         sc->samples_per_frame, chunk_samples);

  1934.                         size = (samples / sc->samples_per_frame) * sc->bytes_per_frame;

  1935.                     } else {

  1936.                         samples = FFMIN(1024, chunk_samples);

  1937.                         size = samples * sc->sample_size;

  1938.                     }

  1939.                 }

  1940. 

  1941.                 if (st->nb_index_entries >= total) {

  1942.                     av_log(mov->fc, AV_LOG_ERROR, "wrong chunk count %d\n", total);

  1943.                     return;

  1944.                 }

  1945.                 e = &st->index_entries[st->nb_index_entries++];

  1946.                 e->pos = current_offset;

  1947.                 e->timestamp = current_dts;

  1948.                 e->size = size;

  1949.                 e->min_distance = 0;

  1950.                 e->flags = AVINDEX_KEYFRAME;

  1951.                 av_dlog(mov->fc, "AVIndex stream %d, chunk %d, offset %"PRIx64", dts %"PRId64", "

  1952.                         "size %d, duration %d\n", st->index, i, current_offset, current_dts,

  1953.                         size, samples);

  1954. 

  1955.                 current_offset += size;

  1956.                 current_dts += samples;

  1957.                 chunk_samples -= samples;

  1958.             }

  1959.         }

  1960.     }

  1961. }

  1962. 

  1963. static int mov_open_dref(AVIOContext **pb, char *src, MOVDref *ref,

  1964.                          AVIOInterruptCB *int_cb)

  1965. {

  1966.     /* try relative path, we do not try the absolute because it can leak information about our

  1967.        system to an attacker */

  1968.     if (ref->nlvl_to > 0 && ref->nlvl_from > 0) {

  1969.         char filename[1024];

  1970.         char *src_path;

  1971.         int i, l;

  1972. 

  1973.         /* find a source dir */

  1974.         src_path = strrchr(src, '/');

  1975.         if (src_path)

  1976.             src_path++;

  1977.         else

  1978.             src_path = src;

  1979. 

  1980.         /* find a next level down to target */

  1981.         for (i = 0, l = strlen(ref->path) - 1; l >= 0; l--)

  1982.             if (ref->path[l] == '/') {

  1983.                 if (i == ref->nlvl_to - 1)

  1984.                     break;

  1985.                 else

  1986.                     i++;

  1987.             }

  1988. 

  1989.         /* compose filename if next level down to target was found */

  1990.         if (i == ref->nlvl_to - 1 && src_path - src  < sizeof(filename)) {

  1991.             memcpy(filename, src, src_path - src);

  1992.             filename[src_path - src] = 0;

  1993. 

  1994.             for (i = 1; i < ref->nlvl_from; i++)

  1995.                 av_strlcat(filename, "../", 1024);

  1996. 

  1997.             av_strlcat(filename, ref->path + l + 1, 1024);

  1998. 

  1999.             if (!avio_open2(pb, filename, AVIO_FLAG_READ, int_cb, NULL))

  2000.                 return 0;

  2001.         }

  2002.     }

  2003. 

  2004.     return AVERROR(ENOENT);

  2005. }

  2006. 

  2007. static int mov_read_trak(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2008. {

  2009.     AVStream *st;

  2010.     MOVStreamContext *sc;

  2011.     int ret;

  2012. 

  2013.     st = avformat_new_stream(c->fc, NULL);

  2014.     if (!st) return AVERROR(ENOMEM);

  2015.     st->id = c->fc->nb_streams;

  2016.     sc = av_mallocz(sizeof(MOVStreamContext));

  2017.     if (!sc) return AVERROR(ENOMEM);

  2018. 

  2019.     st->priv_data = sc;

  2020.     st->codec->codec_type = AVMEDIA_TYPE_DATA;

  2021.     sc->ffindex = st->index;

  2022. 

  2023.     if ((ret = mov_read_default(c, pb, atom)) < 0)

  2024.         return ret;

  2025. 

  2026.     /* sanity checks */

  2027.     if (sc->chunk_count && (!sc->stts_count || !sc->stsc_count ||

  2028.                             (!sc->sample_size && !sc->sample_count))) {

  2029.         av_log(c->fc, AV_LOG_ERROR, "stream %d, missing mandatory atoms, broken header\n",

  2030.                st->index);

  2031.         return 0;

  2032.     }

  2033. 

  2034.     if (sc->time_scale <= 0) {

  2035.         av_log(c->fc, AV_LOG_WARNING, "stream %d, timescale not set\n", st->index);

  2036.         sc->time_scale = c->time_scale;

  2037.         if (sc->time_scale <= 0)

  2038.             sc->time_scale = 1;

  2039.     }

  2040. 

  2041.     avpriv_set_pts_info(st, 64, 1, sc->time_scale);

  2042. 

  2043.     mov_build_index(c, st);

  2044. 

  2045.     if (sc->dref_id-1 < sc->drefs_count && sc->drefs[sc->dref_id-1].path) {

  2046.         MOVDref *dref = &sc->drefs[sc->dref_id - 1];

  2047.         if (mov_open_dref(&sc->pb, c->fc->filename, dref, &c->fc->interrupt_callback) < 0)

  2048.             av_log(c->fc, AV_LOG_ERROR,

  2049.                    "stream %d, error opening alias: path='%s', dir='%s', "

  2050.                    "filename='%s', volume='%s', nlvl_from=%d, nlvl_to=%d\n",

  2051.                    st->index, dref->path, dref->dir, dref->filename,

  2052.                    dref->volume, dref->nlvl_from, dref->nlvl_to);

  2053.     } else

  2054.         sc->pb = c->fc->pb;

  2055. 

  2056.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  2057.         if (!st->sample_aspect_ratio.num &&

  2058.             (st->codec->width != sc->width || st->codec->height != sc->height)) {

  2059.             st->sample_aspect_ratio = av_d2q(((double)st->codec->height * sc->width) /

  2060.                                              ((double)st->codec->width * sc->height), INT_MAX);

  2061.         }

  2062. 

  2063.         if (st->duration != AV_NOPTS_VALUE)

  2064.             av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,

  2065.                       sc->time_scale*st->nb_frames, st->duration, INT_MAX);

  2066.     }

  2067. 

  2068.     switch (st->codec->codec_id) {

  2069. #if CONFIG_H261_DECODER

  2070.     case AV_CODEC_ID_H261:

  2071. #endif

  2072. #if CONFIG_H263_DECODER

  2073.     case AV_CODEC_ID_H263:

  2074. #endif

  2075. #if CONFIG_MPEG4_DECODER

  2076.     case AV_CODEC_ID_MPEG4:

  2077. #endif

  2078.         st->codec->width = 0; /* let decoder init width/height */

  2079.         st->codec->height= 0;

  2080.         break;

  2081.     }

  2082. 

  2083.     /* Do not need those anymore. */

  2084.     av_freep(&sc->chunk_offsets);

  2085.     av_freep(&sc->stsc_data);

  2086.     av_freep(&sc->sample_sizes);

  2087.     av_freep(&sc->keyframes);

  2088.     av_freep(&sc->stts_data);

  2089.     av_freep(&sc->stps_data);

  2090.     av_freep(&sc->rap_group);

  2091. 

  2092.     return 0;

  2093. }

  2094. 

  2095. static int mov_read_ilst(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2096. {

  2097.     int ret;

  2098.     c->itunes_metadata = 1;

  2099.     ret = mov_read_default(c, pb, atom);

  2100.     c->itunes_metadata = 0;

  2101.     return ret;

  2102. }

  2103. 

  2104. static int mov_read_meta(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2105. {

  2106.     while (atom.size > 8) {

  2107.         uint32_t tag = avio_rl32(pb);

  2108.         atom.size -= 4;

  2109.         if (tag == MKTAG('h','d','l','r')) {

  2110.             avio_seek(pb, -8, SEEK_CUR);

  2111.             atom.size += 8;

  2112.             return mov_read_default(c, pb, atom);

  2113.         }

  2114.     }

  2115.     return 0;

  2116. }

  2117. 

  2118. static int mov_read_tkhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2119. {

  2120.     int i;

  2121.     int width;

  2122.     int height;

  2123.     int64_t disp_transform[2];

  2124.     int display_matrix[3][2];

  2125.     AVStream *st;

  2126.     MOVStreamContext *sc;

  2127.     int version;

  2128. 

  2129.     if (c->fc->nb_streams < 1)

  2130.         return 0;

  2131.     st = c->fc->streams[c->fc->nb_streams-1];

  2132.     sc = st->priv_data;

  2133. 

  2134.     version = avio_r8(pb);

  2135.     avio_rb24(pb); /* flags */

  2136.     /*

  2137.     MOV_TRACK_ENABLED 0x0001

  2138.     MOV_TRACK_IN_MOVIE 0x0002

  2139.     MOV_TRACK_IN_PREVIEW 0x0004

  2140.     MOV_TRACK_IN_POSTER 0x0008

  2141.     */

  2142. 

  2143.     if (version == 1) {

  2144.         avio_rb64(pb);

  2145.         avio_rb64(pb);

  2146.     } else {

  2147.         avio_rb32(pb); /* creation time */

  2148.         avio_rb32(pb); /* modification time */

  2149.     }

  2150.     st->id = (int)avio_rb32(pb); /* track id (NOT 0 !)*/

  2151.     avio_rb32(pb); /* reserved */

  2152. 

  2153.     /* highlevel (considering edits) duration in movie timebase */

  2154.     (version == 1) ? avio_rb64(pb) : avio_rb32(pb);

  2155.     avio_rb32(pb); /* reserved */

  2156.     avio_rb32(pb); /* reserved */

  2157. 

  2158.     avio_rb16(pb); /* layer */

  2159.     avio_rb16(pb); /* alternate group */

  2160.     avio_rb16(pb); /* volume */

  2161.     avio_rb16(pb); /* reserved */

  2162. 

  2163.     //read in the display matrix (outlined in ISO 14496-12, Section 6.2.2)

  2164.     // they're kept in fixed point format through all calculations

  2165.     // ignore u,v,z b/c we don't need the scale factor to calc aspect ratio

  2166.     for (i = 0; i < 3; i++) {

  2167.         display_matrix[i][0] = avio_rb32(pb);   // 16.16 fixed point

  2168.         display_matrix[i][1] = avio_rb32(pb);   // 16.16 fixed point

  2169.         avio_rb32(pb);           // 2.30 fixed point (not used)

  2170.     }

  2171. 

  2172.     width = avio_rb32(pb);       // 16.16 fixed point track width

  2173.     height = avio_rb32(pb);      // 16.16 fixed point track height

  2174.     sc->width = width >> 16;

  2175.     sc->height = height >> 16;

  2176. 

  2177.     // transform the display width/height according to the matrix

  2178.     // skip this if the display matrix is the default identity matrix

  2179.     // or if it is rotating the picture, ex iPhone 3GS

  2180.     // to keep the same scale, use [width height 1<<16]

  2181.     if (width && height &&

  2182.         ((display_matrix[0][0] != 65536  ||

  2183.           display_matrix[1][1] != 65536) &&

  2184.          !display_matrix[0][1] &&

  2185.          !display_matrix[1][0] &&

  2186.          !display_matrix[2][0] && !display_matrix[2][1])) {

  2187.         for (i = 0; i < 2; i++)

  2188.             disp_transform[i] =

  2189.                 (int64_t)  width  * display_matrix[0][i] +

  2190.                 (int64_t)  height * display_matrix[1][i] +

  2191.                 ((int64_t) display_matrix[2][i] << 16);

  2192. 

  2193.         //sample aspect ratio is new width/height divided by old width/height

  2194.         st->sample_aspect_ratio = av_d2q(

  2195.             ((double) disp_transform[0] * height) /

  2196.             ((double) disp_transform[1] * width), INT_MAX);

  2197.     }

  2198.     return 0;

  2199. }

  2200. 

  2201. static int mov_read_tfhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2202. {

  2203.     MOVFragment *frag = &c->fragment;

  2204.     MOVTrackExt *trex = NULL;

  2205.     int flags, track_id, i;

  2206. 

  2207.     avio_r8(pb); /* version */

  2208.     flags = avio_rb24(pb);

  2209. 

  2210.     track_id = avio_rb32(pb);

  2211.     if (!track_id)

  2212.         return AVERROR_INVALIDDATA;

  2213.     frag->track_id = track_id;

  2214.     for (i = 0; i < c->trex_count; i++)

  2215.         if (c->trex_data[i].track_id == frag->track_id) {

  2216.             trex = &c->trex_data[i];

  2217.             break;

  2218.         }

  2219.     if (!trex) {

  2220.         av_log(c->fc, AV_LOG_ERROR, "could not find corresponding trex\n");

  2221.         return AVERROR_INVALIDDATA;

  2222.     }

  2223. 

  2224.     frag->base_data_offset = flags & MOV_TFHD_BASE_DATA_OFFSET ?

  2225.                              avio_rb64(pb) : frag->moof_offset;

  2226.     frag->stsd_id  = flags & MOV_TFHD_STSD_ID ? avio_rb32(pb) : trex->stsd_id;

  2227. 

  2228.     frag->duration = flags & MOV_TFHD_DEFAULT_DURATION ?

  2229.                      avio_rb32(pb) : trex->duration;

  2230.     frag->size     = flags & MOV_TFHD_DEFAULT_SIZE ?

  2231.                      avio_rb32(pb) : trex->size;

  2232.     frag->flags    = flags & MOV_TFHD_DEFAULT_FLAGS ?

  2233.                      avio_rb32(pb) : trex->flags;

  2234.     av_dlog(c->fc, "frag flags 0x%x\n", frag->flags);

  2235.     return 0;

  2236. }

  2237. 

  2238. static int mov_read_chap(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2239. {

  2240.     c->chapter_track = avio_rb32(pb);

  2241.     return 0;

  2242. }

  2243. 

  2244. static int mov_read_trex(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2245. {

  2246.     MOVTrackExt *trex;

  2247. 

  2248.     if ((uint64_t)c->trex_count+1 >= UINT_MAX / sizeof(*c->trex_data))

  2249.         return AVERROR_INVALIDDATA;

  2250.     trex = av_realloc(c->trex_data, (c->trex_count+1)*sizeof(*c->trex_data));

  2251.     if (!trex)

  2252.         return AVERROR(ENOMEM);

  2253.     c->trex_data = trex;

  2254.     trex = &c->trex_data[c->trex_count++];

  2255.     avio_r8(pb); /* version */

  2256.     avio_rb24(pb); /* flags */

  2257.     trex->track_id = avio_rb32(pb);

  2258.     trex->stsd_id  = avio_rb32(pb);

  2259.     trex->duration = avio_rb32(pb);

  2260.     trex->size     = avio_rb32(pb);

  2261.     trex->flags    = avio_rb32(pb);

  2262.     return 0;

  2263. }

  2264. 

  2265. static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2266. {

  2267.     MOVFragment *frag = &c->fragment;

  2268.     AVStream *st = NULL;

  2269.     MOVStreamContext *sc;

  2270.     MOVStts *ctts_data;

  2271.     uint64_t offset;

  2272.     int64_t dts;

  2273.     int data_offset = 0;

  2274.     unsigned entries, first_sample_flags = frag->flags;

  2275.     int flags, distance, i, found_keyframe = 0;

  2276. 

  2277.     for (i = 0; i < c->fc->nb_streams; i++) {

  2278.         if (c->fc->streams[i]->id == frag->track_id) {

  2279.             st = c->fc->streams[i];

  2280.             break;

  2281.         }

  2282.     }

  2283.     if (!st) {

  2284.         av_log(c->fc, AV_LOG_ERROR, "could not find corresponding track id %d\n", frag->track_id);

  2285.         return AVERROR_INVALIDDATA;

  2286.     }

  2287.     sc = st->priv_data;

  2288.     if (sc->pseudo_stream_id+1 != frag->stsd_id)

  2289.         return 0;

  2290.     avio_r8(pb); /* version */

  2291.     flags = avio_rb24(pb);

  2292.     entries = avio_rb32(pb);

  2293.     av_dlog(c->fc, "flags 0x%x entries %d\n", flags, entries);

  2294. 

  2295.     /* Always assume the presence of composition time offsets.

  2296.      * Without this assumption, for instance, we cannot deal with a track in fragmented movies that meet the following.

  2297.      *  1) in the initial movie, there are no samples.

  2298.      *  2) in the first movie fragment, there is only one sample without composition time offset.

  2299.      *  3) in the subsequent movie fragments, there are samples with composition time offset. */

  2300.     if (!sc->ctts_count && sc->sample_count)

  2301.     {

  2302.         /* Complement ctts table if moov atom doesn't have ctts atom. */

  2303.         ctts_data = av_malloc(sizeof(*sc->ctts_data));

  2304.         if (!ctts_data)

  2305.             return AVERROR(ENOMEM);

  2306.         sc->ctts_data = ctts_data;

  2307.         sc->ctts_data[sc->ctts_count].count = sc->sample_count;

  2308.         sc->ctts_data[sc->ctts_count].duration = 0;

  2309.         sc->ctts_count++;

  2310.     }

  2311.     if ((uint64_t)entries+sc->ctts_count >= UINT_MAX/sizeof(*sc->ctts_data))

  2312.         return AVERROR_INVALIDDATA;

  2313.     ctts_data = av_realloc(sc->ctts_data,

  2314.                            (entries+sc->ctts_count)*sizeof(*sc->ctts_data));

  2315.     if (!ctts_data)

  2316.         return AVERROR(ENOMEM);

  2317.     sc->ctts_data = ctts_data;

  2318. 

  2319.     if (flags & MOV_TRUN_DATA_OFFSET)        data_offset        = avio_rb32(pb);

  2320.     if (flags & MOV_TRUN_FIRST_SAMPLE_FLAGS) first_sample_flags = avio_rb32(pb);

  2321.     dts    = sc->track_end - sc->time_offset;

  2322.     offset = frag->base_data_offset + data_offset;

  2323.     distance = 0;

  2324.     av_dlog(c->fc, "first sample flags 0x%x\n", first_sample_flags);

  2325.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  2326.         unsigned sample_size = frag->size;

  2327.         int sample_flags = i ? frag->flags : first_sample_flags;

  2328.         unsigned sample_duration = frag->duration;

  2329.         int keyframe = 0;

  2330. 

  2331.         if (flags & MOV_TRUN_SAMPLE_DURATION) sample_duration = avio_rb32(pb);

  2332.         if (flags & MOV_TRUN_SAMPLE_SIZE)     sample_size     = avio_rb32(pb);

  2333.         if (flags & MOV_TRUN_SAMPLE_FLAGS)    sample_flags    = avio_rb32(pb);

  2334.         sc->ctts_data[sc->ctts_count].count = 1;

  2335.         sc->ctts_data[sc->ctts_count].duration = (flags & MOV_TRUN_SAMPLE_CTS) ?

  2336.                                                   avio_rb32(pb) : 0;

  2337.         sc->ctts_count++;

  2338.         if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)

  2339.             keyframe = 1;

  2340.         else if (!found_keyframe)

  2341.             keyframe = found_keyframe =

  2342.                 !(sample_flags & (MOV_FRAG_SAMPLE_FLAG_IS_NON_SYNC |

  2343.                                   MOV_FRAG_SAMPLE_FLAG_DEPENDS_YES));

  2344.         if (keyframe)

  2345.             distance = 0;

  2346.         av_add_index_entry(st, offset, dts, sample_size, distance,

  2347.                            keyframe ? AVINDEX_KEYFRAME : 0);

  2348.         av_dlog(c->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "

  2349.                 "size %d, distance %d, keyframe %d\n", st->index, sc->sample_count+i,

  2350.                 offset, dts, sample_size, distance, keyframe);

  2351.         distance++;

  2352.         dts += sample_duration;

  2353.         offset += sample_size;

  2354.         sc->data_size += sample_size;

  2355.     }

  2356. 

  2357.     if (pb->eof_reached)

  2358.         return AVERROR_EOF;

  2359. 

  2360.     frag->moof_offset = offset;

  2361.     st->duration = sc->track_end = dts + sc->time_offset;

  2362.     return 0;

  2363. }

  2364. 

  2365. /* this atom should be null (from specs), but some buggy files put the 'moov' atom inside it... */

  2366. /* like the files created with Adobe Premiere 5.0, for samples see */

  2367. /* http://graphics.tudelft.nl/~wouter/publications/soundtests/ */

  2368. static int mov_read_wide(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2369. {

  2370.     int err;

  2371. 

  2372.     if (atom.size < 8)

  2373.         return 0; /* continue */

  2374.     if (avio_rb32(pb) != 0) { /* 0 sized mdat atom... use the 'wide' atom size */

  2375.         avio_skip(pb, atom.size - 4);

  2376.         return 0;

  2377.     }

  2378.     atom.type = avio_rl32(pb);

  2379.     atom.size -= 8;

  2380.     if (atom.type != MKTAG('m','d','a','t')) {

  2381.         avio_skip(pb, atom.size);

  2382.         return 0;

  2383.     }

  2384.     err = mov_read_mdat(c, pb, atom);

  2385.     return err;

  2386. }

  2387. 

  2388. static int mov_read_cmov(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2389. {

  2390. #if CONFIG_ZLIB

  2391.     AVIOContext ctx;

  2392.     uint8_t *cmov_data;

  2393.     uint8_t *moov_data; /* uncompressed data */

  2394.     long cmov_len, moov_len;

  2395.     int ret = -1;

  2396. 

  2397.     avio_rb32(pb); /* dcom atom */

  2398.     if (avio_rl32(pb) != MKTAG('d','c','o','m'))

  2399.         return AVERROR_INVALIDDATA;

  2400.     if (avio_rl32(pb) != MKTAG('z','l','i','b')) {

  2401.         av_log(c->fc, AV_LOG_ERROR, "unknown compression for cmov atom !");

  2402.         return AVERROR_INVALIDDATA;

  2403.     }

  2404.     avio_rb32(pb); /* cmvd atom */

  2405.     if (avio_rl32(pb) != MKTAG('c','m','v','d'))

  2406.         return AVERROR_INVALIDDATA;

  2407.     moov_len = avio_rb32(pb); /* uncompressed size */

  2408.     cmov_len = atom.size - 6 * 4;

  2409. 

  2410.     cmov_data = av_malloc(cmov_len);

  2411.     if (!cmov_data)

  2412.         return AVERROR(ENOMEM);

  2413.     moov_data = av_malloc(moov_len);

  2414.     if (!moov_data) {

  2415.         av_free(cmov_data);

  2416.         return AVERROR(ENOMEM);

  2417.     }

  2418.     avio_read(pb, cmov_data, cmov_len);

  2419.     if (uncompress (moov_data, (uLongf *) &moov_len, (const Bytef *)cmov_data, cmov_len) != Z_OK)

  2420.         goto free_and_return;

  2421.     if (ffio_init_context(&ctx, moov_data, moov_len, 0, NULL, NULL, NULL, NULL) != 0)

  2422.         goto free_and_return;

  2423.     atom.type = MKTAG('m','o','o','v');

  2424.     atom.size = moov_len;

  2425.     ret = mov_read_default(c, &ctx, atom);

  2426. free_and_return:

  2427.     av_free(moov_data);

  2428.     av_free(cmov_data);

  2429.     return ret;

  2430. #else

  2431.     av_log(c->fc, AV_LOG_ERROR, "this file requires zlib support compiled in\n");

  2432.     return AVERROR(ENOSYS);

  2433. #endif

  2434. }

  2435. 

  2436. /* edit list atom */

  2437. static int mov_read_elst(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2438. {

  2439.     MOVStreamContext *sc;

  2440.     int i, edit_count, version;

  2441. 

  2442.     if (c->fc->nb_streams < 1)

  2443.         return 0;

  2444.     sc = c->fc->streams[c->fc->nb_streams-1]->priv_data;

  2445. 

  2446.     version = avio_r8(pb); /* version */

  2447.     avio_rb24(pb); /* flags */

  2448.     edit_count = avio_rb32(pb); /* entries */

  2449. 

  2450.     if ((uint64_t)edit_count*12+8 > atom.size)

  2451.         return AVERROR_INVALIDDATA;

  2452. 

  2453.     for (i=0; i<edit_count; i++){

  2454.         int64_t time;

  2455.         int64_t duration;

  2456.         if (version == 1) {

  2457.             duration = avio_rb64(pb);

  2458.             time     = avio_rb64(pb);

  2459.         } else {

  2460.             duration = avio_rb32(pb); /* segment duration */

  2461.             time     = (int32_t)avio_rb32(pb); /* media time */

  2462.         }

  2463.         avio_rb32(pb); /* Media rate */

  2464.         if (i == 0 && time >= -1) {

  2465.             sc->time_offset = time != -1 ? time : -duration;

  2466.         }

  2467.     }

  2468. 

  2469.     if (edit_count > 1)

  2470.         av_log(c->fc, AV_LOG_WARNING, "multiple edit list entries, "

  2471.                "a/v desync might occur, patch welcome\n");

  2472. 

  2473.     av_dlog(c->fc, "track[%i].edit_count = %i\n", c->fc->nb_streams-1, edit_count);

  2474.     return 0;

  2475. }

  2476. 

  2477. static const MOVParseTableEntry mov_default_parse_table[] = {

  2478. { MKTAG('a','v','s','s'), mov_read_extradata },

  2479. { MKTAG('c','h','p','l'), mov_read_chpl },

  2480. { MKTAG('c','o','6','4'), mov_read_stco },

  2481. { MKTAG('c','t','t','s'), mov_read_ctts }, /* composition time to sample */

  2482. { MKTAG('d','i','n','f'), mov_read_default },

  2483. { MKTAG('d','r','e','f'), mov_read_dref },

  2484. { MKTAG('e','d','t','s'), mov_read_default },

  2485. { MKTAG('e','l','s','t'), mov_read_elst },

  2486. { MKTAG('e','n','d','a'), mov_read_enda },

  2487. { MKTAG('f','i','e','l'), mov_read_fiel },

  2488. { MKTAG('f','t','y','p'), mov_read_ftyp },

  2489. { MKTAG('g','l','b','l'), mov_read_glbl },

  2490. { MKTAG('h','d','l','r'), mov_read_hdlr },

  2491. { MKTAG('i','l','s','t'), mov_read_ilst },

  2492. { MKTAG('j','p','2','h'), mov_read_extradata },

  2493. { MKTAG('m','d','a','t'), mov_read_mdat },

  2494. { MKTAG('m','d','h','d'), mov_read_mdhd },

  2495. { MKTAG('m','d','i','a'), mov_read_default },

  2496. { MKTAG('m','e','t','a'), mov_read_meta },

  2497. { MKTAG('m','i','n','f'), mov_read_default },

  2498. { MKTAG('m','o','o','f'), mov_read_moof },

  2499. { MKTAG('m','o','o','v'), mov_read_moov },

  2500. { MKTAG('m','v','e','x'), mov_read_default },

  2501. { MKTAG('m','v','h','d'), mov_read_mvhd },

  2502. { MKTAG('S','M','I',' '), mov_read_smi }, /* Sorenson extension ??? */

  2503. { MKTAG('a','l','a','c'), mov_read_extradata }, /* alac specific atom */

  2504. { MKTAG('a','v','c','C'), mov_read_glbl },

  2505. { MKTAG('p','a','s','p'), mov_read_pasp },

  2506. { MKTAG('s','t','b','l'), mov_read_default },

  2507. { MKTAG('s','t','c','o'), mov_read_stco },

  2508. { MKTAG('s','t','p','s'), mov_read_stps },

  2509. { MKTAG('s','t','r','f'), mov_read_strf },

  2510. { MKTAG('s','t','s','c'), mov_read_stsc },

  2511. { MKTAG('s','t','s','d'), mov_read_stsd }, /* sample description */

  2512. { MKTAG('s','t','s','s'), mov_read_stss }, /* sync sample */

  2513. { MKTAG('s','t','s','z'), mov_read_stsz }, /* sample size */

  2514. { MKTAG('s','t','t','s'), mov_read_stts },

  2515. { MKTAG('s','t','z','2'), mov_read_stsz }, /* compact sample size */

  2516. { MKTAG('t','k','h','d'), mov_read_tkhd }, /* track header */

  2517. { MKTAG('t','f','h','d'), mov_read_tfhd }, /* track fragment header */

  2518. { MKTAG('t','r','a','k'), mov_read_trak },

  2519. { MKTAG('t','r','a','f'), mov_read_default },

  2520. { MKTAG('t','r','e','f'), mov_read_default },

  2521. { MKTAG('c','h','a','p'), mov_read_chap },

  2522. { MKTAG('t','r','e','x'), mov_read_trex },

  2523. { MKTAG('t','r','u','n'), mov_read_trun },

  2524. { MKTAG('u','d','t','a'), mov_read_default },

  2525. { MKTAG('w','a','v','e'), mov_read_wave },

  2526. { MKTAG('e','s','d','s'), mov_read_esds },

  2527. { MKTAG('d','a','c','3'), mov_read_dac3 }, /* AC-3 info */

  2528. { MKTAG('d','e','c','3'), mov_read_dec3 }, /* EAC-3 info */

  2529. { MKTAG('w','i','d','e'), mov_read_wide }, /* place holder */

  2530. { MKTAG('w','f','e','x'), mov_read_wfex },

  2531. { MKTAG('c','m','o','v'), mov_read_cmov },

  2532. { MKTAG('c','h','a','n'), mov_read_chan }, /* channel layout */

  2533. { MKTAG('d','v','c','1'), mov_read_dvc1 },

  2534. { MKTAG('s','b','g','p'), mov_read_sbgp },

  2535. { 0, NULL }

  2536. };

  2537. 

  2538. static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2539. {

  2540.     int64_t total_size = 0;

  2541.     MOVAtom a;

  2542.     int i;

  2543. 

  2544.     if (atom.size < 0)

  2545.         atom.size = INT64_MAX;

  2546.     while (total_size + 8 < atom.size && !pb->eof_reached) {

  2547.         int (*parse)(MOVContext*, AVIOContext*, MOVAtom) = NULL;

  2548.         a.size = atom.size;

  2549.         a.type=0;

  2550.         if (atom.size >= 8) {

  2551.             a.size = avio_rb32(pb);

  2552.             a.type = avio_rl32(pb);

  2553.         }

  2554.         av_dlog(c->fc, "type: %08x '%.4s' parent:'%.4s' sz: %"PRId64" %"PRId64" %"PRId64"\n",

  2555.                 a.type, (char*)&a.type, (char*)&atom.type, a.size, total_size, atom.size);

  2556.         total_size += 8;

  2557.         if (a.size == 1) { /* 64 bit extended size */

  2558.             a.size = avio_rb64(pb) - 8;

  2559.             total_size += 8;

  2560.         }

  2561.         if (a.size == 0) {

  2562.             a.size = atom.size - total_size;

  2563.             if (a.size <= 8)

  2564.                 break;

  2565.         }

  2566.         a.size -= 8;

  2567.         if (a.size < 0)

  2568.             break;

  2569.         a.size = FFMIN(a.size, atom.size - total_size);

  2570. 

  2571.         for (i = 0; mov_default_parse_table[i].type; i++)

  2572.             if (mov_default_parse_table[i].type == a.type) {

  2573.                 parse = mov_default_parse_table[i].parse;

  2574.                 break;

  2575.             }

  2576. 

  2577.         // container is user data

  2578.         if (!parse && (atom.type == MKTAG('u','d','t','a') ||

  2579.                        atom.type == MKTAG('i','l','s','t')))

  2580.             parse = mov_read_udta_string;

  2581. 

  2582.         if (!parse) { /* skip leaf atoms data */

  2583.             avio_skip(pb, a.size);

  2584.         } else {

  2585.             int64_t start_pos = avio_tell(pb);

  2586.             int64_t left;

  2587.             int err = parse(c, pb, a);

  2588.             if (err < 0)

  2589.                 return err;

  2590.             if (c->found_moov && c->found_mdat &&

  2591.                 ((!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX) ||

  2592.                  start_pos + a.size == avio_size(pb))) {

  2593.                 if (!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX)

  2594.                     c->next_root_atom = start_pos + a.size;

  2595.                 return 0;

  2596.             }

  2597.             left = a.size - avio_tell(pb) + start_pos;

  2598.             if (left > 0) /* skip garbage at atom end */

  2599.                 avio_skip(pb, left);

  2600.             else if (left < 0) {

  2601.                 av_log(c->fc, AV_LOG_WARNING,

  2602.                        "overread end of atom '%.4s' by %"PRId64" bytes\n",

  2603.                        (char*)&a.type, -left);

  2604.                 avio_seek(pb, left, SEEK_CUR);

  2605.             }

  2606.         }

  2607. 

  2608.         total_size += a.size;

  2609.     }

  2610. 

  2611.     if (total_size < atom.size && atom.size < 0x7ffff)

  2612.         avio_skip(pb, atom.size - total_size);

  2613. 

  2614.     return 0;

  2615. }

  2616. 

  2617. static int mov_probe(AVProbeData *p)

  2618. {

  2619.     unsigned int offset;

  2620.     uint32_t tag;

  2621.     int score = 0;

  2622. 

  2623.     /* check file header */

  2624.     offset = 0;

  2625.     for (;;) {

  2626.         /* ignore invalid offset */

  2627.         if ((offset + 8) > (unsigned int)p->buf_size)

  2628.             return score;

  2629.         tag = AV_RL32(p->buf + offset + 4);

  2630.         switch(tag) {

  2631.         /* check for obvious tags */

  2632.         case MKTAG('j','P',' ',' '): /* jpeg 2000 signature */

  2633.         case MKTAG('m','o','o','v'):

  2634.         case MKTAG('m','d','a','t'):

  2635.         case MKTAG('p','n','o','t'): /* detect movs with preview pics like ew.mov and april.mov */

  2636.         case MKTAG('u','d','t','a'): /* Packet Video PVAuthor adds this and a lot of more junk */

  2637.         case MKTAG('f','t','y','p'):

  2638.             return AVPROBE_SCORE_MAX;

  2639.         /* those are more common words, so rate then a bit less */

  2640.         case MKTAG('e','d','i','w'): /* xdcam files have reverted first tags */

  2641.         case MKTAG('w','i','d','e'):

  2642.         case MKTAG('f','r','e','e'):

  2643.         case MKTAG('j','u','n','k'):

  2644.         case MKTAG('p','i','c','t'):

  2645.             return AVPROBE_SCORE_MAX - 5;

  2646.         case MKTAG(0x82,0x82,0x7f,0x7d):

  2647.         case MKTAG('s','k','i','p'):

  2648.         case MKTAG('u','u','i','d'):

  2649.         case MKTAG('p','r','f','l'):

  2650.             offset = AV_RB32(p->buf+offset) + offset;

  2651.             /* if we only find those cause probedata is too small at least rate them */

  2652.             score = AVPROBE_SCORE_EXTENSION;

  2653.             break;

  2654.         default:

  2655.             /* unrecognized tag */

  2656.             return score;

  2657.         }

  2658.     }

  2659. }

  2660. 

  2661. // must be done after parsing all trak because there's no order requirement

  2662. static void mov_read_chapters(AVFormatContext *s)

  2663. {

  2664.     MOVContext *mov = s->priv_data;

  2665.     AVStream *st = NULL;

  2666.     MOVStreamContext *sc;

  2667.     int64_t cur_pos;

  2668.     int i;

  2669. 

  2670.     for (i = 0; i < s->nb_streams; i++)

  2671.         if (s->streams[i]->id == mov->chapter_track) {

  2672.             st = s->streams[i];

  2673.             break;

  2674.         }

  2675.     if (!st) {

  2676.         av_log(s, AV_LOG_ERROR, "Referenced QT chapter track not found\n");

  2677.         return;

  2678.     }

  2679. 

  2680.     st->discard = AVDISCARD_ALL;

  2681.     sc = st->priv_data;

  2682.     cur_pos = avio_tell(sc->pb);

  2683. 

  2684.     for (i = 0; i < st->nb_index_entries; i++) {

  2685.         AVIndexEntry *sample = &st->index_entries[i];

  2686.         int64_t end = i+1 < st->nb_index_entries ? st->index_entries[i+1].timestamp : st->duration;

  2687.         uint8_t *title;

  2688.         uint16_t ch;

  2689.         int len, title_len;

  2690. 

  2691.         if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {

  2692.             av_log(s, AV_LOG_ERROR, "Chapter %d not found in file\n", i);

  2693.             goto finish;

  2694.         }

  2695. 

  2696.         // the first two bytes are the length of the title

  2697.         len = avio_rb16(sc->pb);

  2698.         if (len > sample->size-2)

  2699.             continue;

  2700.         title_len = 2*len + 1;

  2701.         if (!(title = av_mallocz(title_len)))

  2702.             goto finish;

  2703. 

  2704.         // The samples could theoretically be in any encoding if there's an encd

  2705.         // atom following, but in practice are only utf-8 or utf-16, distinguished

  2706.         // instead by the presence of a BOM

  2707.         if (!len) {

  2708.             title[0] = 0;

  2709.         } else {

  2710.             ch = avio_rb16(sc->pb);

  2711.             if (ch == 0xfeff)

  2712.                 avio_get_str16be(sc->pb, len, title, title_len);

  2713.             else if (ch == 0xfffe)

  2714.                 avio_get_str16le(sc->pb, len, title, title_len);

  2715.             else {

  2716.                 AV_WB16(title, ch);

  2717.                 if (len == 1 || len == 2)

  2718.                     title[len] = 0;

  2719.                 else

  2720.                     avio_get_str(sc->pb, len - 2, title + 2, title_len - 2);

  2721.             }

  2722.         }

  2723. 

  2724.         avpriv_new_chapter(s, i, st->time_base, sample->timestamp, end, title);

  2725.         av_freep(&title);

  2726.     }

  2727. finish:

  2728.     avio_seek(sc->pb, cur_pos, SEEK_SET);

  2729. }

  2730. 

  2731. static int mov_read_close(AVFormatContext *s)

  2732. {

  2733.     MOVContext *mov = s->priv_data;

  2734.     int i, j;

  2735. 

  2736.     for (i = 0; i < s->nb_streams; i++) {

  2737.         AVStream *st = s->streams[i];

  2738.         MOVStreamContext *sc = st->priv_data;

  2739. 

  2740.         av_freep(&sc->ctts_data);

  2741.         for (j = 0; j < sc->drefs_count; j++) {

  2742.             av_freep(&sc->drefs[j].path);

  2743.             av_freep(&sc->drefs[j].dir);

  2744.         }

  2745.         av_freep(&sc->drefs);

  2746.         if (sc->pb && sc->pb != s->pb)

  2747.             avio_close(sc->pb);

  2748.     }

  2749. 

  2750.     if (mov->dv_demux) {

  2751.         for (i = 0; i < mov->dv_fctx->nb_streams; i++) {

  2752.             av_freep(&mov->dv_fctx->streams[i]->codec);

  2753.             av_freep(&mov->dv_fctx->streams[i]);

  2754.         }

  2755.         av_freep(&mov->dv_fctx);

  2756.         av_freep(&mov->dv_demux);

  2757.     }

  2758. 

  2759.     av_freep(&mov->trex_data);

  2760. 

  2761.     return 0;

  2762. }

  2763. 

  2764. static int mov_read_header(AVFormatContext *s)

  2765. {

  2766.     MOVContext *mov = s->priv_data;

  2767.     AVIOContext *pb = s->pb;

  2768.     int err;

  2769.     MOVAtom atom = { AV_RL32("root") };

  2770. 

  2771.     mov->fc = s;

  2772.     /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */

  2773.     if (pb->seekable)

  2774.         atom.size = avio_size(pb);

  2775.     else

  2776.         atom.size = INT64_MAX;

  2777. 

  2778.     /* check MOV header */

  2779.     if ((err = mov_read_default(mov, pb, atom)) < 0) {

  2780.         av_log(s, AV_LOG_ERROR, "error reading header: %d\n", err);

  2781.         mov_read_close(s);

  2782.         return err;

  2783.     }

  2784.     if (!mov->found_moov) {

  2785.         av_log(s, AV_LOG_ERROR, "moov atom not found\n");

  2786.         mov_read_close(s);

  2787.         return AVERROR_INVALIDDATA;

  2788.     }

  2789.     av_dlog(mov->fc, "on_parse_exit_offset=%"PRId64"\n", avio_tell(pb));

  2790. 

  2791.     if (pb->seekable && mov->chapter_track > 0)

  2792.         mov_read_chapters(s);

  2793. 

  2794.     if (mov->trex_data) {

  2795.         int i;

  2796.         for (i = 0; i < s->nb_streams; i++) {

  2797.             AVStream *st = s->streams[i];

  2798.             MOVStreamContext *sc = st->priv_data;

  2799.             if (st->duration)

  2800.                 st->codec->bit_rate = sc->data_size * 8 * sc->time_scale / st->duration;

  2801.         }

  2802.     }

  2803. 

  2804.     return 0;

  2805. }

  2806. 

  2807. static AVIndexEntry *mov_find_next_sample(AVFormatContext *s, AVStream **st)

  2808. {

  2809.     AVIndexEntry *sample = NULL;

  2810.     int64_t best_dts = INT64_MAX;

  2811.     int i;

  2812.     for (i = 0; i < s->nb_streams; i++) {

  2813.         AVStream *avst = s->streams[i];

  2814.         MOVStreamContext *msc = avst->priv_data;

  2815.         if (msc->pb && msc->current_sample < avst->nb_index_entries) {

  2816.             AVIndexEntry *current_sample = &avst->index_entries[msc->current_sample];

  2817.             int64_t dts = av_rescale(current_sample->timestamp, AV_TIME_BASE, msc->time_scale);

  2818.             av_dlog(s, "stream %d, sample %d, dts %"PRId64"\n", i, msc->current_sample, dts);

  2819.             if (!sample || (!s->pb->seekable && current_sample->pos < sample->pos) ||

  2820.                 (s->pb->seekable &&

  2821.                  ((msc->pb != s->pb && dts < best_dts) || (msc->pb == s->pb &&

  2822.                  ((FFABS(best_dts - dts) <= AV_TIME_BASE && current_sample->pos < sample->pos) ||

  2823.                   (FFABS(best_dts - dts) > AV_TIME_BASE && dts < best_dts)))))) {

  2824.                 sample = current_sample;

  2825.                 best_dts = dts;

  2826.                 *st = avst;

  2827.             }

  2828.         }

  2829.     }

  2830.     return sample;

  2831. }

  2832. 

  2833. static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)

  2834. {

  2835.     MOVContext *mov = s->priv_data;

  2836.     MOVStreamContext *sc;

  2837.     AVIndexEntry *sample;

  2838.     AVStream *st = NULL;

  2839.     int ret;

  2840.  retry:

  2841.     sample = mov_find_next_sample(s, &st);

  2842.     if (!sample) {

  2843.         mov->found_mdat = 0;

  2844.         if (!mov->next_root_atom)

  2845.             return AVERROR_EOF;

  2846.         avio_seek(s->pb, mov->next_root_atom, SEEK_SET);

  2847.         mov->next_root_atom = 0;

  2848.         if (mov_read_default(mov, s->pb, (MOVAtom){ AV_RL32("root"), INT64_MAX }) < 0 ||

  2849.             s->pb->eof_reached)

  2850.             return AVERROR_EOF;

  2851.         av_dlog(s, "read fragments, offset 0x%"PRIx64"\n", avio_tell(s->pb));

  2852.         goto retry;

  2853.     }

  2854.     sc = st->priv_data;

  2855.     /* must be done just before reading, to avoid infinite loop on sample */

  2856.     sc->current_sample++;

  2857. 

  2858.     if (st->discard != AVDISCARD_ALL) {

  2859.         if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {

  2860.             av_log(mov->fc, AV_LOG_ERROR, "stream %d, offset 0x%"PRIx64": partial file\n",

  2861.                    sc->ffindex, sample->pos);

  2862.             return AVERROR_INVALIDDATA;

  2863.         }

  2864.         ret = av_get_packet(sc->pb, pkt, sample->size);

  2865.         if (ret < 0)

  2866.             return ret;

  2867.         if (sc->has_palette) {

  2868.             uint8_t *pal;

  2869. 

  2870.             pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);

  2871.             if (!pal) {

  2872.                 av_log(mov->fc, AV_LOG_ERROR, "Cannot append palette to packet\n");

  2873.             } else {

  2874.                 memcpy(pal, sc->palette, AVPALETTE_SIZE);

  2875.                 sc->has_palette = 0;

  2876.             }

  2877.         }

  2878. #if CONFIG_DV_DEMUXER

  2879.         if (mov->dv_demux && sc->dv_audio_container) {

  2880.             avpriv_dv_produce_packet(mov->dv_demux, pkt, pkt->data, pkt->size);

  2881.             av_free(pkt->data);

  2882.             pkt->size = 0;

  2883.             ret = avpriv_dv_get_packet(mov->dv_demux, pkt);

  2884.             if (ret < 0)

  2885.                 return ret;

  2886.         }

  2887. #endif

  2888.     }

  2889. 

  2890.     pkt->stream_index = sc->ffindex;

  2891.     pkt->dts = sample->timestamp;

  2892.     if (sc->ctts_data && sc->ctts_index < sc->ctts_count) {

  2893.         pkt->pts = pkt->dts + sc->dts_shift + sc->ctts_data[sc->ctts_index].duration;

  2894.         /* update ctts context */

  2895.         sc->ctts_sample++;

  2896.         if (sc->ctts_index < sc->ctts_count &&

  2897.             sc->ctts_data[sc->ctts_index].count == sc->ctts_sample) {

  2898.             sc->ctts_index++;

  2899.             sc->ctts_sample = 0;

  2900.         }

  2901.         if (sc->wrong_dts)

  2902.             pkt->dts = AV_NOPTS_VALUE;

  2903.     } else {

  2904.         int64_t next_dts = (sc->current_sample < st->nb_index_entries) ?

  2905.             st->index_entries[sc->current_sample].timestamp : st->duration;

  2906.         pkt->duration = next_dts - pkt->dts;

  2907.         pkt->pts = pkt->dts;

  2908.     }

  2909.     if (st->discard == AVDISCARD_ALL)

  2910.         goto retry;

  2911.     pkt->flags |= sample->flags & AVINDEX_KEYFRAME ? AV_PKT_FLAG_KEY : 0;

  2912.     pkt->pos = sample->pos;

  2913.     av_dlog(s, "stream %d, pts %"PRId64", dts %"PRId64", pos 0x%"PRIx64", duration %d\n",

  2914.             pkt->stream_index, pkt->pts, pkt->dts, pkt->pos, pkt->duration);

  2915.     return 0;

  2916. }

  2917. 

  2918. static int mov_seek_stream(AVFormatContext *s, AVStream *st, int64_t timestamp, int flags)

  2919. {

  2920.     MOVStreamContext *sc = st->priv_data;

  2921.     int sample, time_sample;

  2922.     int i;

  2923. 

  2924.     sample = av_index_search_timestamp(st, timestamp, flags);

  2925.     av_dlog(s, "stream %d, timestamp %"PRId64", sample %d\n", st->index, timestamp, sample);

  2926.     if (sample < 0 && st->nb_index_entries && timestamp < st->index_entries[0].timestamp)

  2927.         sample = 0;

  2928.     if (sample < 0) /* not sure what to do */

  2929.         return AVERROR_INVALIDDATA;

  2930.     sc->current_sample = sample;

  2931.     av_dlog(s, "stream %d, found sample %d\n", st->index, sc->current_sample);

  2932.     /* adjust ctts index */

  2933.     if (sc->ctts_data) {

  2934.         time_sample = 0;

  2935.         for (i = 0; i < sc->ctts_count; i++) {

  2936.             int next = time_sample + sc->ctts_data[i].count;

  2937.             if (next > sc->current_sample) {

  2938.                 sc->ctts_index = i;

  2939.                 sc->ctts_sample = sc->current_sample - time_sample;

  2940.                 break;

  2941.             }

  2942.             time_sample = next;

  2943.         }

  2944.     }

  2945.     return sample;

  2946. }

  2947. 

  2948. static int mov_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  2949. {

  2950.     AVStream *st;

  2951.     int64_t seek_timestamp, timestamp;

  2952.     int sample;

  2953.     int i;

  2954. 

  2955.     if (stream_index >= s->nb_streams)

  2956.         return AVERROR_INVALIDDATA;

  2957.     if (sample_time < 0)

  2958.         sample_time = 0;

  2959. 

  2960.     st = s->streams[stream_index];

  2961.     sample = mov_seek_stream(s, st, sample_time, flags);

  2962.     if (sample < 0)

  2963.         return sample;

  2964. 

  2965.     /* adjust seek timestamp to found sample timestamp */

  2966.     seek_timestamp = st->index_entries[sample].timestamp;

  2967. 

  2968.     for (i = 0; i < s->nb_streams; i++) {

  2969.         st = s->streams[i];

  2970.         if (stream_index == i)

  2971.             continue;

  2972. 

  2973.         timestamp = av_rescale_q(seek_timestamp, s->streams[stream_index]->time_base, st->time_base);

  2974.         mov_seek_stream(s, st, timestamp, flags);

  2975.     }

  2976.     return 0;

  2977. }

  2978. 

  2979. AVInputFormat ff_mov_demuxer = {

  2980.     .name           = "mov,mp4,m4a,3gp,3g2,mj2",

  2981.     .long_name      = NULL_IF_CONFIG_SMALL("QuickTime / MOV"),

  2982.     .priv_data_size = sizeof(MOVContext),

  2983.     .read_probe     = mov_probe,

  2984.     .read_header    = mov_read_header,

  2985.     .read_packet    = mov_read_packet,

  2986.     .read_close     = mov_read_close,

  2987.     .read_seek      = mov_read_seek,

  2988. };