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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 <inttypes.h>

  27. #include <limits.h>

  28. #include <stdint.h>

  29. 

  30. //#define MOV_EXPORT_ALL_METADATA

  31. 

  32. #include "libavutil/attributes.h"

  33. #include "libavutil/channel_layout.h"

  34. #include "libavutil/intreadwrite.h"

  35. #include "libavutil/intfloat.h"

  36. #include "libavutil/mathematics.h"

  37. #include "libavutil/avstring.h"

  38. #include "libavutil/dict.h"

  39. #include "libavcodec/ac3tab.h"

  40. #include "avformat.h"

  41. #include "internal.h"

  42. #include "avio_internal.h"

  43. #include "riff.h"

  44. #include "isom.h"

  45. #include "libavcodec/get_bits.h"

  46. #include "id3v1.h"

  47. #include "mov_chan.h"

  48. #include "replaygain.h"

  49. 

  50. #if CONFIG_ZLIB

  51. #include <zlib.h>

  52. #endif

  53. 

  54. #include "qtpalette.h"

  55. 

  56. 

  57. #undef NDEBUG

  58. #include <assert.h>

  59. 

  60. /* those functions parse an atom */

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

  62. typedef struct MOVParseTableEntry {

  63.     uint32_t type;

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

  65. } MOVParseTableEntry;

  66. 

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

  68. 

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

  70.                                              unsigned len, const char *key)

  71. {

  72.     char buf[16];

  73. 

  74.     short current, total = 0;

  75.     avio_rb16(pb); // unknown

  76.     current = avio_rb16(pb);

  77.     if (len >= 6)

  78.         total = avio_rb16(pb);

  79.     if (!total)

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

  81.     else

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

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

  84. 

  85.     return 0;

  86. }

  87. 

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

  89.                                             unsigned len, const char *key)

  90. {

  91.     char buf[16];

  92. 

  93.     /* bypass padding bytes */

  94.     avio_r8(pb);

  95.     avio_r8(pb);

  96.     avio_r8(pb);

  97. 

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

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

  100. 

  101.     return 0;

  102. }

  103. 

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

  105.                                         unsigned len, const char *key)

  106. {

  107.     char buf[16];

  108. 

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

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

  111. 

  112.     return 0;

  113. }

  114. 

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

  116.                              unsigned len, const char *key)

  117. {

  118.     short genre;

  119.     char buf[20];

  120. 

  121.     avio_r8(pb); // unknown

  122. 

  123.     genre = avio_r8(pb);

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

  125.         return 0;

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

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

  128. 

  129.     return 0;

  130. }

  131. 

  132. static const uint32_t mac_to_unicode[128] = {

  133.     0x00C4,0x00C5,0x00C7,0x00C9,0x00D1,0x00D6,0x00DC,0x00E1,

  134.     0x00E0,0x00E2,0x00E4,0x00E3,0x00E5,0x00E7,0x00E9,0x00E8,

  135.     0x00EA,0x00EB,0x00ED,0x00EC,0x00EE,0x00EF,0x00F1,0x00F3,

  136.     0x00F2,0x00F4,0x00F6,0x00F5,0x00FA,0x00F9,0x00FB,0x00FC,

  137.     0x2020,0x00B0,0x00A2,0x00A3,0x00A7,0x2022,0x00B6,0x00DF,

  138.     0x00AE,0x00A9,0x2122,0x00B4,0x00A8,0x2260,0x00C6,0x00D8,

  139.     0x221E,0x00B1,0x2264,0x2265,0x00A5,0x00B5,0x2202,0x2211,

  140.     0x220F,0x03C0,0x222B,0x00AA,0x00BA,0x03A9,0x00E6,0x00F8,

  141.     0x00BF,0x00A1,0x00AC,0x221A,0x0192,0x2248,0x2206,0x00AB,

  142.     0x00BB,0x2026,0x00A0,0x00C0,0x00C3,0x00D5,0x0152,0x0153,

  143.     0x2013,0x2014,0x201C,0x201D,0x2018,0x2019,0x00F7,0x25CA,

  144.     0x00FF,0x0178,0x2044,0x20AC,0x2039,0x203A,0xFB01,0xFB02,

  145.     0x2021,0x00B7,0x201A,0x201E,0x2030,0x00C2,0x00CA,0x00C1,

  146.     0x00CB,0x00C8,0x00CD,0x00CE,0x00CF,0x00CC,0x00D3,0x00D4,

  147.     0xF8FF,0x00D2,0x00DA,0x00DB,0x00D9,0x0131,0x02C6,0x02DC,

  148.     0x00AF,0x02D8,0x02D9,0x02DA,0x00B8,0x02DD,0x02DB,0x02C7,

  149. };

  150. 

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

  152.                                char *dst, int dstlen)

  153. {

  154.     char *p = dst;

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

  156.     int i;

  157. 

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

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

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

  161.             *p++ = c;

  162.         else

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

  164.     }

  165.     *p = 0;

  166.     return p - dst;

  167. }

  168. 

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

  170. {

  171.     AVPacket pkt;

  172.     AVStream *st;

  173.     MOVStreamContext *sc;

  174.     enum AVCodecID id;

  175.     int ret;

  176. 

  177.     switch (type) {

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

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

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

  181.     default:

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

  183.         avio_skip(pb, len);

  184.         return 0;

  185.     }

  186. 

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

  188.     if (!st)

  189.         return AVERROR(ENOMEM);

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

  191.     if (!sc)

  192.         return AVERROR(ENOMEM);

  193.     st->priv_data = sc;

  194. 

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

  196.     if (ret < 0)

  197.         return ret;

  198. 

  199.     st->disposition              |= AV_DISPOSITION_ATTACHED_PIC;

  200. 

  201.     st->attached_pic              = pkt;

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

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

  204. 

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

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

  207. 

  208.     return 0;

  209. }

  210. 

  211. static int mov_metadata_loci(MOVContext *c, AVIOContext *pb, unsigned len)

  212. {

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

  214.     char buf[100];

  215.     uint16_t langcode = 0;

  216.     double longitude, latitude;

  217.     const char *key = "location";

  218. 

  219.     if (len < 4 + 2 + 1 + 1 + 4 + 4 + 4)

  220.         return AVERROR_INVALIDDATA;

  221. 

  222.     avio_skip(pb, 4); // version+flags

  223.     langcode = avio_rb16(pb);

  224.     ff_mov_lang_to_iso639(langcode, language);

  225.     len -= 6;

  226. 

  227.     len -= avio_get_str(pb, len, buf, sizeof(buf)); // place name

  228.     if (len < 1)

  229.         return AVERROR_INVALIDDATA;

  230.     avio_skip(pb, 1); // role

  231.     len -= 1;

  232. 

  233.     if (len < 14)

  234.         return AVERROR_INVALIDDATA;

  235.     longitude = ((int32_t) avio_rb32(pb)) / (float) (1 << 16);

  236.     latitude  = ((int32_t) avio_rb32(pb)) / (float) (1 << 16);

  237. 

  238.     // Try to output in the same format as the ?xyz field

  239.     snprintf(buf, sizeof(buf), "%+08.4f%+09.4f/", latitude, longitude);

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

  241.         char key2[16];

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

  243.         av_dict_set(&c->fc->metadata, key2, buf, 0);

  244.     }

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

  246. }

  247. 

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

  249. {

  250. #ifdef MOV_EXPORT_ALL_METADATA

  251.     char tmp_key[5];

  252. #endif

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

  254.     const char *key = NULL;

  255.     uint16_t langcode = 0;

  256.     uint32_t data_type = 0, str_size;

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

  258. 

  259.     switch (atom.type) {

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

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

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

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

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

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

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

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

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

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

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

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

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

  273.         parse = mov_metadata_gnre; break;

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

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

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

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

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

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

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

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

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

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

  284.         parse = mov_metadata_track_or_disc_number; break;

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

  286.         parse = mov_metadata_track_or_disc_number; break;

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

  288.         parse = mov_metadata_int8_bypass_padding; break;

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

  290.         parse = mov_metadata_int8_bypass_padding; break;

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

  292.         parse = mov_metadata_int8_no_padding; break;

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

  294.         parse = mov_metadata_int8_no_padding; break;

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

  296.         parse = mov_metadata_int8_no_padding; break;

  297.     case MKTAG( 'l','o','c','i'):

  298.         return mov_metadata_loci(c, pb, atom.size);

  299.     }

  300. 

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

  302.         int data_size = avio_rb32(pb);

  303.         int tag = avio_rl32(pb);

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

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

  306.             avio_rb32(pb); // unknown

  307.             str_size = data_size - 16;

  308.             atom.size -= 16;

  309. 

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

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

  312.                 if (ret < 0) {

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

  314.                     return ret;

  315.                 }

  316.             }

  317.         } else return 0;

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

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

  320.         langcode = avio_rb16(pb);

  321.         ff_mov_lang_to_iso639(langcode, language);

  322.         atom.size -= 4;

  323.     } else

  324.         str_size = atom.size;

  325. 

  326. #ifdef MOV_EXPORT_ALL_METADATA

  327.     if (!key) {

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

  329.         key = tmp_key;

  330.     }

  331. #endif

  332. 

  333.     if (!key)

  334.         return 0;

  335.     if (atom.size < 0)

  336.         return AVERROR_INVALIDDATA;

  337. 

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

  339. 

  340.     if (parse)

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

  342.     else {

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

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

  345.         } else {

  346.             avio_read(pb, str, str_size);

  347.             str[str_size] = 0;

  348.         }

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

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

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

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

  353.         }

  354.     }

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

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

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

  358. 

  359.     return 0;

  360. }

  361. 

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

  363. {

  364.     int64_t start;

  365.     int i, nb_chapters, str_len, version;

  366.     char str[256+1];

  367. 

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

  369.         return 0;

  370. 

  371.     version = avio_r8(pb);

  372.     avio_rb24(pb);

  373.     if (version)

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

  375.     nb_chapters = avio_r8(pb);

  376. 

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

  378.         if (atom.size < 9)

  379.             return 0;

  380. 

  381.         start = avio_rb64(pb);

  382.         str_len = avio_r8(pb);

  383. 

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

  385.             return 0;

  386. 

  387.         avio_read(pb, str, str_len);

  388.         str[str_len] = 0;

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

  390.     }

  391.     return 0;

  392. }

  393. 

  394. #define MIN_DATA_ENTRY_BOX_SIZE 12

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

  396. {

  397.     AVStream *st;

  398.     MOVStreamContext *sc;

  399.     int entries, i, j;

  400. 

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

  402.         return 0;

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

  404.     sc = st->priv_data;

  405. 

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

  407.     entries = avio_rb32(pb);

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

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

  410.         return AVERROR_INVALIDDATA;

  411.     av_free(sc->drefs);

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

  413.     if (!sc->drefs)

  414.         return AVERROR(ENOMEM);

  415.     sc->drefs_count = entries;

  416. 

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

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

  419.         uint32_t size = avio_rb32(pb);

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

  421. 

  422.         if (size < 12)

  423.             return AVERROR_INVALIDDATA;

  424. 

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

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

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

  428. 

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

  430.             /* macintosh alias record */

  431.             uint16_t volume_len, len;

  432.             int16_t type;

  433. 

  434.             avio_skip(pb, 10);

  435. 

  436.             volume_len = avio_r8(pb);

  437.             volume_len = FFMIN(volume_len, 27);

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

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

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

  441. 

  442.             avio_skip(pb, 12);

  443. 

  444.             len = avio_r8(pb);

  445.             len = FFMIN(len, 63);

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

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

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

  449. 

  450.             avio_skip(pb, 16);

  451. 

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

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

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

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

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

  457. 

  458.             avio_skip(pb, 16);

  459. 

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

  461.                 if (pb->eof_reached)

  462.                     return AVERROR_EOF;

  463.                 type = avio_rb16(pb);

  464.                 len = avio_rb16(pb);

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

  466.                 if (len&1)

  467.                     len += 1;

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

  469.                     av_free(dref->path);

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

  471.                     if (!dref->path)

  472.                         return AVERROR(ENOMEM);

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

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

  475.                         len -= volume_len;

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

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

  478.                     }

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

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

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

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

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

  484.                     av_free(dref->dir);

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

  486.                     if (!dref->dir)

  487.                         return AVERROR(ENOMEM);

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

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

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

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

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

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

  494.                 } else

  495.                     avio_skip(pb, len);

  496.             }

  497.         }

  498.         avio_seek(pb, next, SEEK_SET);

  499.     }

  500.     return 0;

  501. }

  502. 

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

  504. {

  505.     AVStream *st;

  506.     uint32_t type;

  507.     uint32_t av_unused ctype;

  508. 

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

  510.         return 0;

  511. 

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

  513. 

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

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

  516. 

  517.     /* component type */

  518.     ctype = avio_rl32(pb);

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

  520. 

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

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

  523. 

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

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

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

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

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

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

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

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

  532. 

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

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

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

  536. 

  537.     return 0;

  538. }

  539. 

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

  541. {

  542.     AVStream *st;

  543.     int tag;

  544. 

  545.     if (fc->nb_streams < 1)

  546.         return 0;

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

  548. 

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

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

  551.     if (tag == MP4ESDescrTag) {

  552.         ff_mp4_parse_es_descr(pb, NULL);

  553.     } else

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

  555. 

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

  557.     if (tag == MP4DecConfigDescrTag)

  558.         ff_mp4_read_dec_config_descr(fc, st, pb);

  559.     return 0;

  560. }

  561. 

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

  563. {

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

  565. }

  566. 

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

  568. {

  569.     AVStream *st;

  570.     int ac3info, acmod, lfeon, bsmod;

  571. 

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

  573.         return 0;

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

  575. 

  576.     ac3info = avio_rb24(pb);

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

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

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

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

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

  582.     if (lfeon)

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

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

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

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

  587. 

  588.     return 0;

  589. }

  590. 

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

  592. {

  593.     AVStream *st;

  594.     int eac3info, acmod, lfeon, bsmod;

  595. 

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

  597.         return 0;

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

  599. 

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

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

  602.      * does not support them yet. */

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

  604.     eac3info = avio_rb24(pb);

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

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

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

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

  609.     if (lfeon)

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

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

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

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

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

  615. 

  616.     return 0;

  617. }

  618. 

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

  620. {

  621.     AVStream *st;

  622. 

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

  624.         return 0;

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

  626. 

  627.     if (atom.size < 16)

  628.         return 0;

  629. 

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

  631. 

  632.     return 0;

  633. }

  634. 

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

  636. {

  637.     AVStream *st;

  638. 

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

  640.         return 0;

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

  642. 

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

  644. 

  645.     return 0;

  646. }

  647. 

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

  649. {

  650.     const int num = avio_rb32(pb);

  651.     const int den = avio_rb32(pb);

  652.     AVStream *st;

  653. 

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

  655.         return 0;

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

  657. 

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

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

  660.         av_log(c->fc, AV_LOG_WARNING,

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

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

  663.                num, den);

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

  665.         st->sample_aspect_ratio.num = num;

  666.         st->sample_aspect_ratio.den = den;

  667.     }

  668.     return 0;

  669. }

  670. 

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

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

  673. {

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

  675.         return 0;

  676.     c->found_mdat=1;

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

  678. }

  679. 

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

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

  682. {

  683.     uint32_t minor_ver;

  684.     int comp_brand_size;

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

  686.     char* comp_brands_str;

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

  688. 

  689.     avio_read(pb, type, 4);

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

  691.         c->isom = 1;

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

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

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

  695.     snprintf(minor_ver_str, sizeof(minor_ver_str), "%"PRIu32"", minor_ver);

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

  697. 

  698.     comp_brand_size = atom.size - 8;

  699.     if (comp_brand_size < 0)

  700.         return AVERROR_INVALIDDATA;

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

  702.     if (!comp_brands_str)

  703.         return AVERROR(ENOMEM);

  704.     avio_read(pb, comp_brands_str, comp_brand_size);

  705.     comp_brands_str[comp_brand_size] = 0;

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

  707.     av_freep(&comp_brands_str);

  708. 

  709.     return 0;

  710. }

  711. 

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

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

  714. {

  715.     int ret;

  716. 

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

  718.         return ret;

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

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

  721.     c->found_moov=1;

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

  723. }

  724. 

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

  726. {

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

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

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

  730. }

  731. 

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

  733. {

  734.     char buffer[32];

  735.     if (time) {

  736.         struct tm *ptm;

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

  738.         ptm = gmtime(&time);

  739.         if (!ptm) return;

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

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

  742.     }

  743. }

  744. 

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

  746. {

  747.     AVStream *st;

  748.     MOVStreamContext *sc;

  749.     int version;

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

  751.     unsigned lang;

  752.     time_t creation_time;

  753. 

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

  755.         return 0;

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

  757.     sc = st->priv_data;

  758. 

  759.     if (sc->time_scale) {

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

  761.         return AVERROR_INVALIDDATA;

  762.     }

  763. 

  764.     version = avio_r8(pb);

  765.     if (version > 1) {

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

  767.         return AVERROR_PATCHWELCOME;

  768.     }

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

  770.     if (version == 1) {

  771.         creation_time = avio_rb64(pb);

  772.         avio_rb64(pb);

  773.     } else {

  774.         creation_time = avio_rb32(pb);

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

  776.     }

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

  778. 

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

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

  781. 

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

  783.     if (ff_mov_lang_to_iso639(lang, language))

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

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

  786. 

  787.     return 0;

  788. }

  789. 

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

  791. {

  792.     time_t creation_time;

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

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

  795. 

  796.     if (version == 1) {

  797.         creation_time = avio_rb64(pb);

  798.         avio_rb64(pb);

  799.     } else {

  800.         creation_time = avio_rb32(pb);

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

  802.     }

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

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

  805. 

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

  807. 

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

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

  810. 

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

  812. 

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

  814. 

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

  816. 

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

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

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

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

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

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

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

  824. 

  825.     return 0;

  826. }

  827. 

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

  829. {

  830.     AVStream *st;

  831. 

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

  833.         return 0;

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

  835. 

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

  837.         return AVERROR_INVALIDDATA;

  838. 

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

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

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

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

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

  844.         return AVERROR(ENOMEM);

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

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

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

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

  849.     return 0;

  850. }

  851. 

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

  853. {

  854.     AVStream *st;

  855.     int little_endian;

  856. 

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

  858.         return 0;

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

  860. 

  861.     little_endian = avio_rb16(pb);

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

  863.     if (little_endian == 1) {

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

  865.         case AV_CODEC_ID_PCM_S24BE:

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

  867.             break;

  868.         case AV_CODEC_ID_PCM_S32BE:

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

  870.             break;

  871.         case AV_CODEC_ID_PCM_F32BE:

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

  873.             break;

  874.         case AV_CODEC_ID_PCM_F64BE:

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

  876.             break;

  877.         default:

  878.             break;

  879.         }

  880.     }

  881.     return 0;

  882. }

  883. 

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

  885. {

  886.     AVStream *st;

  887.     unsigned mov_field_order;

  888.     enum AVFieldOrder decoded_field_order = AV_FIELD_UNKNOWN;

  889. 

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

  891.         return 0;

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

  893.     if (atom.size < 2)

  894.         return AVERROR_INVALIDDATA;

  895.     mov_field_order = avio_rb16(pb);

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

  897.         decoded_field_order = AV_FIELD_PROGRESSIVE;

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

  899.         switch (mov_field_order & 0xFF) {

  900.         case 0x01: decoded_field_order = AV_FIELD_TT;

  901.                    break;

  902.         case 0x06: decoded_field_order = AV_FIELD_BB;

  903.                    break;

  904.         case 0x09: decoded_field_order = AV_FIELD_TB;

  905.                    break;

  906.         case 0x0E: decoded_field_order = AV_FIELD_BT;

  907.                    break;

  908.         }

  909.     }

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

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

  912.     }

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

  914. 

  915.     return 0;

  916. }

  917. 

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

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

  920. {

  921.     AVStream *st;

  922.     uint64_t size;

  923.     uint8_t *buf;

  924.     int err;

  925. 

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

  927.         return 0;

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

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

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

  931.         return AVERROR_INVALIDDATA;

  932.     if ((err = av_reallocp(&st->codec->extradata, size)) < 0) {

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

  934.         return err;

  935.     }

  936.     buf = st->codec->extradata + st->codec->extradata_size;

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

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

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

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

  941.     return 0;

  942. }

  943. 

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

  945. {

  946.     AVStream *st;

  947. 

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

  949.         return 0;

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

  951. 

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

  953.         return AVERROR_INVALIDDATA;

  954. 

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

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

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

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

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

  960.             return AVERROR(ENOMEM);

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

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

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

  964.         int ret;

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

  966.             return ret;

  967.     } else

  968.         avio_skip(pb, atom.size);

  969.     return 0;

  970. }

  971. 

  972. /**

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

  974.  * nor size unlike mov_read_extradata.

  975.  */

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

  977. {

  978.     AVStream *st;

  979. 

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

  981.         return 0;

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

  983. 

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

  985.         return AVERROR_INVALIDDATA;

  986. 

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

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

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

  990.         unsigned size = avio_rb32(pb);

  991.         unsigned type = avio_rl32(pb);

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

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

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

  995.     }

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

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

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

  999.         return AVERROR(ENOMEM);

  1000.     st->codec->extradata_size = atom.size;

  1001.     avio_read(pb, st->codec->extradata, atom.size);

  1002.     return 0;

  1003. }

  1004. 

  1005. static int mov_read_dvc1(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1006. {

  1007.     AVStream *st;

  1008.     uint8_t profile_level;

  1009. 

  1010.     if (c->fc->nb_streams < 1)

  1011.         return 0;

  1012.     st = c->fc->streams[c->fc->nb_streams-1];

  1013. 

  1014.     if (atom.size >= (1<<28) || atom.size < 7)

  1015.         return AVERROR_INVALIDDATA;

  1016. 

  1017.     profile_level = avio_r8(pb);

  1018.     if ((profile_level & 0xf0) != 0xc0)

  1019.         return 0;

  1020. 

  1021.     av_free(st->codec->extradata);

  1022.     st->codec->extradata = av_mallocz(atom.size - 7 + FF_INPUT_BUFFER_PADDING_SIZE);

  1023.     if (!st->codec->extradata)

  1024.         return AVERROR(ENOMEM);

  1025.     st->codec->extradata_size = atom.size - 7;

  1026.     avio_seek(pb, 6, SEEK_CUR);

  1027.     avio_read(pb, st->codec->extradata, st->codec->extradata_size);

  1028.     return 0;

  1029. }

  1030. 

  1031. /**

  1032.  * An strf atom is a BITMAPINFOHEADER struct. This struct is 40 bytes itself,

  1033.  * but can have extradata appended at the end after the 40 bytes belonging

  1034.  * to the struct.

  1035.  */

  1036. static int mov_read_strf(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1037. {

  1038.     AVStream *st;

  1039. 

  1040.     if (c->fc->nb_streams < 1)

  1041.         return 0;

  1042.     if (atom.size <= 40)

  1043.         return 0;

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

  1045. 

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

  1047.         return AVERROR_INVALIDDATA;

  1048. 

  1049.     av_free(st->codec->extradata);

  1050.     st->codec->extradata = av_mallocz(atom.size - 40 + FF_INPUT_BUFFER_PADDING_SIZE);

  1051.     if (!st->codec->extradata)

  1052.         return AVERROR(ENOMEM);

  1053.     st->codec->extradata_size = atom.size - 40;

  1054.     avio_skip(pb, 40);

  1055.     avio_read(pb, st->codec->extradata, atom.size - 40);

  1056.     return 0;

  1057. }

  1058. 

  1059. static int mov_read_stco(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1060. {

  1061.     AVStream *st;

  1062.     MOVStreamContext *sc;

  1063.     unsigned int i, entries;

  1064. 

  1065.     if (c->fc->nb_streams < 1)

  1066.         return 0;

  1067.     st = c->fc->streams[c->fc->nb_streams-1];

  1068.     sc = st->priv_data;

  1069. 

  1070.     avio_r8(pb); /* version */

  1071.     avio_rb24(pb); /* flags */

  1072. 

  1073.     entries = avio_rb32(pb);

  1074. 

  1075.     if (!entries)

  1076.         return 0;

  1077.     if (entries >= UINT_MAX/sizeof(int64_t))

  1078.         return AVERROR_INVALIDDATA;

  1079. 

  1080.     sc->chunk_offsets = av_malloc(entries * sizeof(int64_t));

  1081.     if (!sc->chunk_offsets)

  1082.         return AVERROR(ENOMEM);

  1083.     sc->chunk_count = entries;

  1084. 

  1085.     if      (atom.type == MKTAG('s','t','c','o'))

  1086.         for (i = 0; i < entries && !pb->eof_reached; i++)

  1087.             sc->chunk_offsets[i] = avio_rb32(pb);

  1088.     else if (atom.type == MKTAG('c','o','6','4'))

  1089.         for (i = 0; i < entries && !pb->eof_reached; i++)

  1090.             sc->chunk_offsets[i] = avio_rb64(pb);

  1091.     else

  1092.         return AVERROR_INVALIDDATA;

  1093. 

  1094.     sc->chunk_count = i;

  1095. 

  1096.     if (pb->eof_reached)

  1097.         return AVERROR_EOF;

  1098. 

  1099.     return 0;

  1100. }

  1101. 

  1102. /**

  1103.  * Compute codec id for 'lpcm' tag.

  1104.  * See CoreAudioTypes and AudioStreamBasicDescription at Apple.

  1105.  */

  1106. enum AVCodecID ff_mov_get_lpcm_codec_id(int bps, int flags)

  1107. {

  1108.     /* lpcm flags:

  1109.      * 0x1 = float

  1110.      * 0x2 = big-endian

  1111.      * 0x4 = signed

  1112.      */

  1113.     return ff_get_pcm_codec_id(bps, flags & 1, flags & 2, flags & 4 ? -1 : 0);

  1114. }

  1115. 

  1116. static int mov_codec_id(AVStream *st, uint32_t format)

  1117. {

  1118.     int id = ff_codec_get_id(ff_codec_movaudio_tags, format);

  1119. 

  1120.     if (id <= 0 &&

  1121.         ((format & 0xFFFF) == 'm' + ('s' << 8) ||

  1122.          (format & 0xFFFF) == 'T' + ('S' << 8)))

  1123.         id = ff_codec_get_id(ff_codec_wav_tags, av_bswap32(format) & 0xFFFF);

  1124. 

  1125.     if (st->codec->codec_type != AVMEDIA_TYPE_VIDEO && id > 0) {

  1126.         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

  1127.     } else if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO &&

  1128.                /* skip old asf mpeg4 tag */

  1129.                format && format != MKTAG('m','p','4','s')) {

  1130.         id = ff_codec_get_id(ff_codec_movvideo_tags, format);

  1131.         if (id <= 0)

  1132.             id = ff_codec_get_id(ff_codec_bmp_tags, format);

  1133.         if (id > 0)

  1134.             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

  1135.         else if (st->codec->codec_type == AVMEDIA_TYPE_DATA) {

  1136.             id = ff_codec_get_id(ff_codec_movsubtitle_tags, format);

  1137.             if (id > 0)

  1138.                 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;

  1139.         }

  1140.     }

  1141. 

  1142.     st->codec->codec_tag = format;

  1143. 

  1144.     return id;

  1145. }

  1146. 

  1147. static void mov_parse_stsd_video(MOVContext *c, AVIOContext *pb,

  1148.                                  AVStream *st, MOVStreamContext *sc)

  1149. {

  1150.     uint8_t codec_name[32];

  1151.     unsigned int color_depth, len, j;

  1152.     int color_greyscale;

  1153.     int color_table_id;

  1154. 

  1155.     avio_rb16(pb); /* version */

  1156.     avio_rb16(pb); /* revision level */

  1157.     avio_rb32(pb); /* vendor */

  1158.     avio_rb32(pb); /* temporal quality */

  1159.     avio_rb32(pb); /* spatial quality */

  1160. 

  1161.     st->codec->width  = avio_rb16(pb); /* width */

  1162.     st->codec->height = avio_rb16(pb); /* height */

  1163. 

  1164.     avio_rb32(pb); /* horiz resolution */

  1165.     avio_rb32(pb); /* vert resolution */

  1166.     avio_rb32(pb); /* data size, always 0 */

  1167.     avio_rb16(pb); /* frames per samples */

  1168. 

  1169.     len = avio_r8(pb); /* codec name, pascal string */

  1170.     if (len > 31)

  1171.         len = 31;

  1172.     mov_read_mac_string(c, pb, len, codec_name, sizeof(codec_name));

  1173.     if (len < 31)

  1174.         avio_skip(pb, 31 - len);

  1175. 

  1176.     if (codec_name[0])

  1177.         av_dict_set(&st->metadata, "encoder", codec_name, 0);

  1178. 

  1179.     /* codec_tag YV12 triggers an UV swap in rawdec.c */

  1180.     if (!memcmp(codec_name, "Planar Y'CbCr 8-bit 4:2:0", 25))

  1181.         st->codec->codec_tag = MKTAG('I', '4', '2', '0');

  1182.     /* Flash Media Server uses tag H263 with Sorenson Spark */

  1183.     if (st->codec->codec_tag == MKTAG('H','2','6','3') &&

  1184.         !memcmp(codec_name, "Sorenson H263", 13))

  1185.         st->codec->codec_id = AV_CODEC_ID_FLV1;

  1186. 

  1187.     st->codec->bits_per_coded_sample = avio_rb16(pb); /* depth */

  1188.     color_table_id = avio_rb16(pb); /* colortable id */

  1189.     av_dlog(c->fc, "depth %d, ctab id %d\n",

  1190.             st->codec->bits_per_coded_sample, color_table_id);

  1191.     /* figure out the palette situation */

  1192.     color_depth     = st->codec->bits_per_coded_sample & 0x1F;

  1193.     color_greyscale = st->codec->bits_per_coded_sample & 0x20;

  1194. 

  1195.     /* if the depth is 2, 4, or 8 bpp, file is palettized */

  1196.     if ((color_depth == 2) || (color_depth == 4) || (color_depth == 8)) {

  1197.         /* for palette traversal */

  1198.         unsigned int color_start, color_count, color_end;

  1199.         unsigned char r, g, b;

  1200. 

  1201.         if (color_greyscale) {

  1202.             int color_index, color_dec;

  1203.             /* compute the greyscale palette */

  1204.             st->codec->bits_per_coded_sample = color_depth;

  1205.             color_count = 1 << color_depth;

  1206.             color_index = 255;

  1207.             color_dec   = 256 / (color_count - 1);

  1208.             for (j = 0; j < color_count; j++) {

  1209.                 r = g = b = color_index;

  1210.                 sc->palette[j] = (r << 16) | (g << 8) | (b);

  1211.                 color_index -= color_dec;

  1212.                 if (color_index < 0)

  1213.                     color_index = 0;

  1214.             }

  1215.         } else if (color_table_id) {

  1216.             const uint8_t *color_table;

  1217.             /* if flag bit 3 is set, use the default palette */

  1218.             color_count = 1 << color_depth;

  1219.             if (color_depth == 2)

  1220.                 color_table = ff_qt_default_palette_4;

  1221.             else if (color_depth == 4)

  1222.                 color_table = ff_qt_default_palette_16;

  1223.             else

  1224.                 color_table = ff_qt_default_palette_256;

  1225. 

  1226.             for (j = 0; j < color_count; j++) {

  1227.                 r = color_table[j * 3 + 0];

  1228.                 g = color_table[j * 3 + 1];

  1229.                 b = color_table[j * 3 + 2];

  1230.                 sc->palette[j] = (r << 16) | (g << 8) | (b);

  1231.             }

  1232.         } else {

  1233.             /* load the palette from the file */

  1234.             color_start = avio_rb32(pb);

  1235.             color_count = avio_rb16(pb);

  1236.             color_end   = avio_rb16(pb);

  1237.             if ((color_start <= 255) && (color_end <= 255)) {

  1238.                 for (j = color_start; j <= color_end; j++) {

  1239.                     /* each R, G, or B component is 16 bits;

  1240.                      * only use the top 8 bits; skip alpha bytes

  1241.                      * up front */

  1242.                     avio_r8(pb);

  1243.                     avio_r8(pb);

  1244.                     r = avio_r8(pb);

  1245.                     avio_r8(pb);

  1246.                     g = avio_r8(pb);

  1247.                     avio_r8(pb);

  1248.                     b = avio_r8(pb);

  1249.                     avio_r8(pb);

  1250.                     sc->palette[j] = (r << 16) | (g << 8) | (b);

  1251.                 }

  1252.             }

  1253.         }

  1254.         sc->has_palette = 1;

  1255.     }

  1256. }

  1257. 

  1258. static void mov_parse_stsd_audio(MOVContext *c, AVIOContext *pb,

  1259.                                  AVStream *st, MOVStreamContext *sc)

  1260. {

  1261.     int bits_per_sample, flags;

  1262.     uint16_t version = avio_rb16(pb);

  1263. 

  1264.     avio_rb16(pb); /* revision level */

  1265.     avio_rb32(pb); /* vendor */

  1266. 

  1267.     st->codec->channels              = avio_rb16(pb); /* channel count */

  1268.     st->codec->bits_per_coded_sample = avio_rb16(pb); /* sample size */

  1269.     av_dlog(c->fc, "audio channels %d\n", st->codec->channels);

  1270. 

  1271.     sc->audio_cid = avio_rb16(pb);

  1272.     avio_rb16(pb); /* packet size = 0 */

  1273. 

  1274.     st->codec->sample_rate = ((avio_rb32(pb) >> 16));

  1275. 

  1276.     // Read QT version 1 fields. In version 0 these do not exist.

  1277.     av_dlog(c->fc, "version =%d, isom =%d\n", version, c->isom);

  1278.     if (!c->isom) {

  1279.         if (version == 1) {

  1280.             sc->samples_per_frame = avio_rb32(pb);

  1281.             avio_rb32(pb); /* bytes per packet */

  1282.             sc->bytes_per_frame = avio_rb32(pb);

  1283.             avio_rb32(pb); /* bytes per sample */

  1284.         } else if (version == 2) {

  1285.             avio_rb32(pb); /* sizeof struct only */

  1286.             st->codec->sample_rate = av_int2double(avio_rb64(pb));

  1287.             st->codec->channels    = avio_rb32(pb);

  1288.             avio_rb32(pb); /* always 0x7F000000 */

  1289.             st->codec->bits_per_coded_sample = avio_rb32(pb);

  1290. 

  1291.             flags = avio_rb32(pb); /* lpcm format specific flag */

  1292.             sc->bytes_per_frame   = avio_rb32(pb);

  1293.             sc->samples_per_frame = avio_rb32(pb);

  1294.             if (st->codec->codec_tag == MKTAG('l','p','c','m'))

  1295.                 st->codec->codec_id =

  1296.                     ff_mov_get_lpcm_codec_id(st->codec->bits_per_coded_sample,

  1297.                                              flags);

  1298.         }

  1299.     }

  1300. 

  1301.     switch (st->codec->codec_id) {

  1302.     case AV_CODEC_ID_PCM_S8:

  1303.     case AV_CODEC_ID_PCM_U8:

  1304.         if (st->codec->bits_per_coded_sample == 16)

  1305.             st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;

  1306.         break;

  1307.     case AV_CODEC_ID_PCM_S16LE:

  1308.     case AV_CODEC_ID_PCM_S16BE:

  1309.         if (st->codec->bits_per_coded_sample == 8)

  1310.             st->codec->codec_id = AV_CODEC_ID_PCM_S8;

  1311.         else if (st->codec->bits_per_coded_sample == 24)

  1312.             st->codec->codec_id =

  1313.                 st->codec->codec_id == AV_CODEC_ID_PCM_S16BE ?

  1314.                 AV_CODEC_ID_PCM_S24BE : AV_CODEC_ID_PCM_S24LE;

  1315.         break;

  1316.     /* set values for old format before stsd version 1 appeared */

  1317.     case AV_CODEC_ID_MACE3:

  1318.         sc->samples_per_frame = 6;

  1319.         sc->bytes_per_frame   = 2 * st->codec->channels;

  1320.         break;

  1321.     case AV_CODEC_ID_MACE6:

  1322.         sc->samples_per_frame = 6;

  1323.         sc->bytes_per_frame   = 1 * st->codec->channels;

  1324.         break;

  1325.     case AV_CODEC_ID_ADPCM_IMA_QT:

  1326.         sc->samples_per_frame = 64;

  1327.         sc->bytes_per_frame   = 34 * st->codec->channels;

  1328.         break;

  1329.     case AV_CODEC_ID_GSM:

  1330.         sc->samples_per_frame = 160;

  1331.         sc->bytes_per_frame   = 33;

  1332.         break;

  1333.     default:

  1334.         break;

  1335.     }

  1336. 

  1337.     bits_per_sample = av_get_bits_per_sample(st->codec->codec_id);

  1338.     if (bits_per_sample) {

  1339.         st->codec->bits_per_coded_sample = bits_per_sample;

  1340.         sc->sample_size = (bits_per_sample >> 3) * st->codec->channels;

  1341.     }

  1342. }

  1343. 

  1344. static void mov_parse_stsd_subtitle(MOVContext *c, AVIOContext *pb,

  1345.                                     AVStream *st, MOVStreamContext *sc,

  1346.                                     int size)

  1347. {

  1348.     // ttxt stsd contains display flags, justification, background

  1349.     // color, fonts, and default styles, so fake an atom to read it

  1350.     MOVAtom fake_atom = { .size = size };

  1351.     // mp4s contains a regular esds atom

  1352.     if (st->codec->codec_tag != AV_RL32("mp4s"))

  1353.         mov_read_glbl(c, pb, fake_atom);

  1354.     st->codec->width  = sc->width;

  1355.     st->codec->height = sc->height;

  1356. }

  1357. 

  1358. static uint32_t yuv_to_rgba(uint32_t ycbcr)

  1359. {

  1360.     uint8_t r, g, b;

  1361.     int y, cb, cr;

  1362. 

  1363.     y  = (ycbcr >> 16) & 0xFF;

  1364.     cr = (ycbcr >> 8)  & 0xFF;

  1365.     cb =  ycbcr        & 0xFF;

  1366. 

  1367.     b = av_clip_uint8(1.164 * (y - 16)                      + 2.018 * (cb - 128));

  1368.     g = av_clip_uint8(1.164 * (y - 16) - 0.813 * (cr - 128) - 0.391 * (cb - 128));

  1369.     r = av_clip_uint8(1.164 * (y - 16) + 1.596 * (cr - 128));

  1370. 

  1371.     return (r << 16) | (g << 8) | b;

  1372. }

  1373. 

  1374. static int mov_rewrite_dvd_sub_extradata(AVStream *st)

  1375. {

  1376.     char buf[256] = {0};

  1377.     uint8_t *src = st->codec->extradata;

  1378.     int i;

  1379. 

  1380.     if (st->codec->extradata_size != 64)

  1381.         return 0;

  1382. 

  1383.     if (st->codec->width > 0 &&  st->codec->height > 0)

  1384.         snprintf(buf, sizeof(buf), "size: %dx%d\n",

  1385.                  st->codec->width, st->codec->height);

  1386.     av_strlcat(buf, "palette: ", sizeof(buf));

  1387. 

  1388.     for (i = 0; i < 16; i++) {

  1389.         uint32_t yuv = AV_RB32(src + i * 4);

  1390.         uint32_t rgba = yuv_to_rgba(yuv);

  1391. 

  1392.         av_strlcatf(buf, sizeof(buf), "%06"PRIx32"%s", rgba, i != 15 ? ", " : "");

  1393.     }

  1394. 

  1395.     if (av_strlcat(buf, "\n", sizeof(buf)) >= sizeof(buf))

  1396.         return 0;

  1397. 

  1398.     av_freep(&st->codec->extradata);

  1399.     st->codec->extradata_size = 0;

  1400.     st->codec->extradata = av_mallocz(strlen(buf) + FF_INPUT_BUFFER_PADDING_SIZE);

  1401.     if (!st->codec->extradata)

  1402.         return AVERROR(ENOMEM);

  1403.     st->codec->extradata_size = strlen(buf);

  1404.     memcpy(st->codec->extradata, buf, st->codec->extradata_size);

  1405. 

  1406.     return 0;

  1407. }

  1408. 

  1409. static int mov_parse_stsd_data(MOVContext *c, AVIOContext *pb,

  1410.                                 AVStream *st, MOVStreamContext *sc,

  1411.                                 int size)

  1412. {

  1413.     if (st->codec->codec_tag == MKTAG('t','m','c','d')) {

  1414.         st->codec->extradata_size = size;

  1415.         st->codec->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);

  1416.         if (!st->codec->extradata)

  1417.             return AVERROR(ENOMEM);

  1418.         avio_read(pb, st->codec->extradata, size);

  1419.     } else {

  1420.         /* other codec type, just skip (rtp, mp4s ...) */

  1421.         avio_skip(pb, size);

  1422.     }

  1423.     return 0;

  1424. }

  1425. 

  1426. static int mov_finalize_stsd_codec(MOVContext *c, AVIOContext *pb,

  1427.                                    AVStream *st, MOVStreamContext *sc)

  1428. {

  1429.     if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&

  1430.         !st->codec->sample_rate && sc->time_scale > 1)

  1431.         st->codec->sample_rate = sc->time_scale;

  1432. 

  1433.     /* special codec parameters handling */

  1434.     switch (st->codec->codec_id) {

  1435. #if CONFIG_DV_DEMUXER

  1436.     case AV_CODEC_ID_DVAUDIO:

  1437.         c->dv_fctx  = avformat_alloc_context();

  1438.         c->dv_demux = avpriv_dv_init_demux(c->dv_fctx);

  1439.         if (!c->dv_demux) {

  1440.             av_log(c->fc, AV_LOG_ERROR, "dv demux context init error\n");

  1441.             return AVERROR(ENOMEM);

  1442.         }

  1443.         sc->dv_audio_container = 1;

  1444.         st->codec->codec_id    = AV_CODEC_ID_PCM_S16LE;

  1445.         break;

  1446. #endif

  1447.     /* no ifdef since parameters are always those */

  1448.     case AV_CODEC_ID_QCELP:

  1449.         st->codec->channels = 1;

  1450.         // force sample rate for qcelp when not stored in mov

  1451.         if (st->codec->codec_tag != MKTAG('Q','c','l','p'))

  1452.             st->codec->sample_rate = 8000;

  1453.         break;

  1454.     case AV_CODEC_ID_AMR_NB:

  1455.         st->codec->channels    = 1;

  1456.         /* force sample rate for amr, stsd in 3gp does not store sample rate */

  1457.         st->codec->sample_rate = 8000;

  1458.         break;

  1459.     case AV_CODEC_ID_AMR_WB:

  1460.         st->codec->channels    = 1;

  1461.         st->codec->sample_rate = 16000;

  1462.         break;

  1463.     case AV_CODEC_ID_MP2:

  1464.     case AV_CODEC_ID_MP3:

  1465.         /* force type after stsd for m1a hdlr */

  1466.         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

  1467.         st->need_parsing      = AVSTREAM_PARSE_FULL;

  1468.         break;

  1469.     case AV_CODEC_ID_GSM:

  1470.     case AV_CODEC_ID_ADPCM_MS:

  1471.     case AV_CODEC_ID_ADPCM_IMA_WAV:

  1472.     case AV_CODEC_ID_ILBC:

  1473.         st->codec->block_align = sc->bytes_per_frame;

  1474.         break;

  1475.     case AV_CODEC_ID_ALAC:

  1476.         if (st->codec->extradata_size == 36) {

  1477.             st->codec->channels    = AV_RB8 (st->codec->extradata + 21);

  1478.             st->codec->sample_rate = AV_RB32(st->codec->extradata + 32);

  1479.         }

  1480.         break;

  1481.     case AV_CODEC_ID_VC1:

  1482.         st->need_parsing = AVSTREAM_PARSE_FULL;

  1483.         break;

  1484.     default:

  1485.         break;

  1486.     }

  1487.     return 0;

  1488. }

  1489. 

  1490. static int mov_skip_multiple_stsd(MOVContext *c, AVIOContext *pb,

  1491.                                   int codec_tag, int format,

  1492.                                   int size)

  1493. {

  1494.     int video_codec_id = ff_codec_get_id(ff_codec_movvideo_tags, format);

  1495. 

  1496.     if (codec_tag &&

  1497.         (codec_tag == AV_RL32("avc1") ||

  1498.          codec_tag == AV_RL32("hvc1") ||

  1499.          codec_tag == AV_RL32("hev1") ||

  1500.          (codec_tag != format &&

  1501.           (c->fc->video_codec_id ? video_codec_id != c->fc->video_codec_id

  1502.                                  : codec_tag != MKTAG('j','p','e','g'))))) {

  1503.         /* Multiple fourcc, we skip JPEG. This is not correct, we should

  1504.          * export it as a separate AVStream but this needs a few changes

  1505.          * in the MOV demuxer, patch welcome. */

  1506. 

  1507.         av_log(c->fc, AV_LOG_WARNING, "multiple fourcc not supported\n");

  1508.         avio_skip(pb, size);

  1509.         return 1;

  1510.     }

  1511. 

  1512.     return 0;

  1513. }

  1514. 

  1515. int ff_mov_read_stsd_entries(MOVContext *c, AVIOContext *pb, int entries)

  1516. {

  1517.     AVStream *st;

  1518.     MOVStreamContext *sc;

  1519.     int pseudo_stream_id;

  1520. 

  1521.     if (c->fc->nb_streams < 1)

  1522.         return 0;

  1523.     st = c->fc->streams[c->fc->nb_streams-1];

  1524.     sc = st->priv_data;

  1525. 

  1526.     for (pseudo_stream_id = 0;

  1527.          pseudo_stream_id < entries && !pb->eof_reached;

  1528.          pseudo_stream_id++) {

  1529.         //Parsing Sample description table

  1530.         enum AVCodecID id;

  1531.         int ret, dref_id = 1;

  1532.         MOVAtom a = { AV_RL32("stsd") };

  1533.         int64_t start_pos = avio_tell(pb);

  1534.         uint32_t size = avio_rb32(pb); /* size */

  1535.         uint32_t format = avio_rl32(pb); /* data format */

  1536. 

  1537.         if (size >= 16) {

  1538.             avio_rb32(pb); /* reserved */

  1539.             avio_rb16(pb); /* reserved */

  1540.             dref_id = avio_rb16(pb);

  1541.         } else {

  1542.             av_log(c->fc, AV_LOG_ERROR, "invalid size %"PRIu32" in stsd\n", size);

  1543.             return AVERROR_INVALIDDATA;

  1544.         }

  1545. 

  1546.         if (mov_skip_multiple_stsd(c, pb, st->codec->codec_tag, format,

  1547.                                    size - (avio_tell(pb) - start_pos)))

  1548.             continue;

  1549. 

  1550.         sc->pseudo_stream_id = st->codec->codec_tag ? -1 : pseudo_stream_id;

  1551.         sc->dref_id= dref_id;

  1552. 

  1553.         id = mov_codec_id(st, format);

  1554. 

  1555.         av_dlog(c->fc, "size=%"PRIu32" 4CC= %"PRIu8"%"PRIu8"%"PRIu8"%"PRIu8" codec_type=%d\n", size,

  1556.                 (format >> 0) & 0xff, (format >> 8) & 0xff, (format >> 16) & 0xff,

  1557.                 (format >> 24) & 0xff, st->codec->codec_type);

  1558. 

  1559.         if (st->codec->codec_type==AVMEDIA_TYPE_VIDEO) {

  1560.             st->codec->codec_id = id;

  1561.             mov_parse_stsd_video(c, pb, st, sc);

  1562.         } else if (st->codec->codec_type==AVMEDIA_TYPE_AUDIO) {

  1563.             st->codec->codec_id = id;

  1564.             mov_parse_stsd_audio(c, pb, st, sc);

  1565.         } else if (st->codec->codec_type==AVMEDIA_TYPE_SUBTITLE){

  1566.             st->codec->codec_id = id;

  1567.             mov_parse_stsd_subtitle(c, pb, st, sc,

  1568.                                     size - (avio_tell(pb) - start_pos));

  1569.         } else {

  1570.             ret = mov_parse_stsd_data(c, pb, st, sc,

  1571.                                       size - (avio_tell(pb) - start_pos));

  1572.             if (ret < 0)

  1573.                 return ret;

  1574.         }

  1575.         /* this will read extra atoms at the end (wave, alac, damr, avcC, hvcC, SMI ...) */

  1576.         a.size = size - (avio_tell(pb) - start_pos);

  1577.         if (a.size > 8) {

  1578.             if ((ret = mov_read_default(c, pb, a)) < 0)

  1579.                 return ret;

  1580.         } else if (a.size > 0)

  1581.             avio_skip(pb, a.size);

  1582.     }

  1583. 

  1584.     if (pb->eof_reached)

  1585.         return AVERROR_EOF;

  1586. 

  1587.     return mov_finalize_stsd_codec(c, pb, st, sc);

  1588. }

  1589. 

  1590. static int mov_read_stsd(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1591. {

  1592.     int entries;

  1593. 

  1594.     avio_r8(pb); /* version */

  1595.     avio_rb24(pb); /* flags */

  1596.     entries = avio_rb32(pb);

  1597. 

  1598.     return ff_mov_read_stsd_entries(c, pb, entries);

  1599. }

  1600. 

  1601. static int mov_read_stsc(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1602. {

  1603.     AVStream *st;

  1604.     MOVStreamContext *sc;

  1605.     unsigned int i, entries;

  1606. 

  1607.     if (c->fc->nb_streams < 1)

  1608.         return 0;

  1609.     st = c->fc->streams[c->fc->nb_streams-1];

  1610.     sc = st->priv_data;

  1611. 

  1612.     avio_r8(pb); /* version */

  1613.     avio_rb24(pb); /* flags */

  1614. 

  1615.     entries = avio_rb32(pb);

  1616. 

  1617.     av_dlog(c->fc, "track[%i].stsc.entries = %i\n", c->fc->nb_streams-1, entries);

  1618. 

  1619.     if (!entries)

  1620.         return 0;

  1621.     if (entries >= UINT_MAX / sizeof(*sc->stsc_data))

  1622.         return AVERROR_INVALIDDATA;

  1623.     sc->stsc_data = av_malloc(entries * sizeof(*sc->stsc_data));

  1624.     if (!sc->stsc_data)

  1625.         return AVERROR(ENOMEM);

  1626. 

  1627.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1628.         sc->stsc_data[i].first = avio_rb32(pb);

  1629.         sc->stsc_data[i].count = avio_rb32(pb);

  1630.         sc->stsc_data[i].id = avio_rb32(pb);

  1631.     }

  1632. 

  1633.     sc->stsc_count = i;

  1634. 

  1635.     if (pb->eof_reached)

  1636.         return AVERROR_EOF;

  1637. 

  1638.     return 0;

  1639. }

  1640. 

  1641. static int mov_read_stps(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1642. {

  1643.     AVStream *st;

  1644.     MOVStreamContext *sc;

  1645.     unsigned i, entries;

  1646. 

  1647.     if (c->fc->nb_streams < 1)

  1648.         return 0;

  1649.     st = c->fc->streams[c->fc->nb_streams-1];

  1650.     sc = st->priv_data;

  1651. 

  1652.     avio_rb32(pb); // version + flags

  1653. 

  1654.     entries = avio_rb32(pb);

  1655.     if (entries >= UINT_MAX / sizeof(*sc->stps_data))

  1656.         return AVERROR_INVALIDDATA;

  1657.     sc->stps_data = av_malloc(entries * sizeof(*sc->stps_data));

  1658.     if (!sc->stps_data)

  1659.         return AVERROR(ENOMEM);

  1660. 

  1661.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1662.         sc->stps_data[i] = avio_rb32(pb);

  1663.         //av_dlog(c->fc, "stps %d\n", sc->stps_data[i]);

  1664.     }

  1665. 

  1666.     sc->stps_count = i;

  1667. 

  1668.     if (pb->eof_reached)

  1669.         return AVERROR_EOF;

  1670. 

  1671.     return 0;

  1672. }

  1673. 

  1674. static int mov_read_stss(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1675. {

  1676.     AVStream *st;

  1677.     MOVStreamContext *sc;

  1678.     unsigned int i, entries;

  1679. 

  1680.     if (c->fc->nb_streams < 1)

  1681.         return 0;

  1682.     st = c->fc->streams[c->fc->nb_streams-1];

  1683.     sc = st->priv_data;

  1684. 

  1685.     avio_r8(pb); /* version */

  1686.     avio_rb24(pb); /* flags */

  1687. 

  1688.     entries = avio_rb32(pb);

  1689. 

  1690.     av_dlog(c->fc, "keyframe_count = %d\n", entries);

  1691. 

  1692.     if (!entries)

  1693.     {

  1694.         sc->keyframe_absent = 1;

  1695.         return 0;

  1696.     }

  1697.     if (entries >= UINT_MAX / sizeof(int))

  1698.         return AVERROR_INVALIDDATA;

  1699.     sc->keyframes = av_malloc(entries * sizeof(int));

  1700.     if (!sc->keyframes)

  1701.         return AVERROR(ENOMEM);

  1702. 

  1703.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1704.         sc->keyframes[i] = avio_rb32(pb);

  1705.         //av_dlog(c->fc, "keyframes[]=%d\n", sc->keyframes[i]);

  1706.     }

  1707. 

  1708.     sc->keyframe_count = i;

  1709. 

  1710.     if (pb->eof_reached)

  1711.         return AVERROR_EOF;

  1712. 

  1713.     return 0;

  1714. }

  1715. 

  1716. static int mov_read_stsz(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1717. {

  1718.     AVStream *st;

  1719.     MOVStreamContext *sc;

  1720.     unsigned int i, entries, sample_size, field_size, num_bytes;

  1721.     GetBitContext gb;

  1722.     unsigned char* buf;

  1723. 

  1724.     if (c->fc->nb_streams < 1)

  1725.         return 0;

  1726.     st = c->fc->streams[c->fc->nb_streams-1];

  1727.     sc = st->priv_data;

  1728. 

  1729.     avio_r8(pb); /* version */

  1730.     avio_rb24(pb); /* flags */

  1731. 

  1732.     if (atom.type == MKTAG('s','t','s','z')) {

  1733.         sample_size = avio_rb32(pb);

  1734.         if (!sc->sample_size) /* do not overwrite value computed in stsd */

  1735.             sc->sample_size = sample_size;

  1736.         field_size = 32;

  1737.     } else {

  1738.         sample_size = 0;

  1739.         avio_rb24(pb); /* reserved */

  1740.         field_size = avio_r8(pb);

  1741.     }

  1742.     entries = avio_rb32(pb);

  1743. 

  1744.     av_dlog(c->fc, "sample_size = %d sample_count = %d\n", sc->sample_size, entries);

  1745. 

  1746.     sc->sample_count = entries;

  1747.     if (sample_size)

  1748.         return 0;

  1749. 

  1750.     if (field_size != 4 && field_size != 8 && field_size != 16 && field_size != 32) {

  1751.         av_log(c->fc, AV_LOG_ERROR, "Invalid sample field size %d\n", field_size);

  1752.         return AVERROR_INVALIDDATA;

  1753.     }

  1754. 

  1755.     if (!entries)

  1756.         return 0;

  1757.     if (entries >= UINT_MAX / sizeof(int) || entries >= (UINT_MAX - 4) / field_size)

  1758.         return AVERROR_INVALIDDATA;

  1759.     sc->sample_sizes = av_malloc(entries * sizeof(int));

  1760.     if (!sc->sample_sizes)

  1761.         return AVERROR(ENOMEM);

  1762. 

  1763.     num_bytes = (entries*field_size+4)>>3;

  1764. 

  1765.     buf = av_malloc(num_bytes+FF_INPUT_BUFFER_PADDING_SIZE);

  1766.     if (!buf) {

  1767.         av_freep(&sc->sample_sizes);

  1768.         return AVERROR(ENOMEM);

  1769.     }

  1770. 

  1771.     if (avio_read(pb, buf, num_bytes) < num_bytes) {

  1772.         av_freep(&sc->sample_sizes);

  1773.         av_free(buf);

  1774.         return AVERROR_INVALIDDATA;

  1775.     }

  1776. 

  1777.     init_get_bits(&gb, buf, 8*num_bytes);

  1778. 

  1779.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1780.         sc->sample_sizes[i] = get_bits_long(&gb, field_size);

  1781.         sc->data_size += sc->sample_sizes[i];

  1782.     }

  1783. 

  1784.     sc->sample_count = i;

  1785. 

  1786.     if (pb->eof_reached)

  1787.         return AVERROR_EOF;

  1788. 

  1789.     av_free(buf);

  1790.     return 0;

  1791. }

  1792. 

  1793. static int mov_read_stts(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1794. {

  1795.     AVStream *st;

  1796.     MOVStreamContext *sc;

  1797.     unsigned int i, entries;

  1798.     int64_t duration=0;

  1799.     int64_t total_sample_count=0;

  1800. 

  1801.     if (c->fc->nb_streams < 1)

  1802.         return 0;

  1803.     st = c->fc->streams[c->fc->nb_streams-1];

  1804.     sc = st->priv_data;

  1805. 

  1806.     avio_r8(pb); /* version */

  1807.     avio_rb24(pb); /* flags */

  1808.     entries = avio_rb32(pb);

  1809. 

  1810.     av_dlog(c->fc, "track[%i].stts.entries = %i\n",

  1811.             c->fc->nb_streams-1, entries);

  1812. 

  1813.     if (!entries)

  1814.         return 0;

  1815.     if (entries >= UINT_MAX / sizeof(*sc->stts_data))

  1816.         return AVERROR(EINVAL);

  1817. 

  1818.     av_free(sc->stts_data);

  1819.     sc->stts_data = av_malloc(entries * sizeof(*sc->stts_data));

  1820.     if (!sc->stts_data)

  1821.         return AVERROR(ENOMEM);

  1822. 

  1823.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1824.         int sample_duration;

  1825.         int sample_count;

  1826. 

  1827.         sample_count=avio_rb32(pb);

  1828.         sample_duration = avio_rb32(pb);

  1829.         if (sample_count < 0) {

  1830.             av_log(c->fc, AV_LOG_ERROR, "Invalid sample_count=%d\n", sample_count);

  1831.             return AVERROR_INVALIDDATA;

  1832.         }

  1833.         sc->stts_data[i].count= sample_count;

  1834.         sc->stts_data[i].duration= sample_duration;

  1835. 

  1836.         av_dlog(c->fc, "sample_count=%d, sample_duration=%d\n",

  1837.                 sample_count, sample_duration);

  1838. 

  1839.         duration+=(int64_t)sample_duration*sample_count;

  1840.         total_sample_count+=sample_count;

  1841.     }

  1842. 

  1843.     sc->stts_count = i;

  1844. 

  1845.     if (pb->eof_reached)

  1846.         return AVERROR_EOF;

  1847. 

  1848.     st->nb_frames= total_sample_count;

  1849.     if (duration)

  1850.         st->duration= duration;

  1851.     sc->track_end = duration;

  1852.     return 0;

  1853. }

  1854. 

  1855. static int mov_read_ctts(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1856. {

  1857.     AVStream *st;

  1858.     MOVStreamContext *sc;

  1859.     unsigned int i, entries;

  1860. 

  1861.     if (c->fc->nb_streams < 1)

  1862.         return 0;

  1863.     st = c->fc->streams[c->fc->nb_streams-1];

  1864.     sc = st->priv_data;

  1865. 

  1866.     avio_r8(pb); /* version */

  1867.     avio_rb24(pb); /* flags */

  1868.     entries = avio_rb32(pb);

  1869. 

  1870.     av_dlog(c->fc, "track[%i].ctts.entries = %i\n", c->fc->nb_streams-1, entries);

  1871. 

  1872.     if (!entries)

  1873.         return 0;

  1874.     if (entries >= UINT_MAX / sizeof(*sc->ctts_data))

  1875.         return AVERROR_INVALIDDATA;

  1876.     sc->ctts_data = av_malloc(entries * sizeof(*sc->ctts_data));

  1877.     if (!sc->ctts_data)

  1878.         return AVERROR(ENOMEM);

  1879. 

  1880.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1881.         int count    =avio_rb32(pb);

  1882.         int duration =avio_rb32(pb);

  1883. 

  1884.         sc->ctts_data[i].count   = count;

  1885.         sc->ctts_data[i].duration= duration;

  1886.         if (duration < 0)

  1887.             sc->dts_shift = FFMAX(sc->dts_shift, -duration);

  1888.     }

  1889. 

  1890.     sc->ctts_count = i;

  1891. 

  1892.     if (pb->eof_reached)

  1893.         return AVERROR_EOF;

  1894. 

  1895.     av_dlog(c->fc, "dts shift %d\n", sc->dts_shift);

  1896. 

  1897.     return 0;

  1898. }

  1899. 

  1900. static int mov_read_sbgp(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1901. {

  1902.     AVStream *st;

  1903.     MOVStreamContext *sc;

  1904.     unsigned int i, entries;

  1905.     uint8_t version;

  1906.     uint32_t grouping_type;

  1907. 

  1908.     if (c->fc->nb_streams < 1)

  1909.         return 0;

  1910.     st = c->fc->streams[c->fc->nb_streams-1];

  1911.     sc = st->priv_data;

  1912. 

  1913.     version = avio_r8(pb); /* version */

  1914.     avio_rb24(pb); /* flags */

  1915.     grouping_type = avio_rl32(pb);

  1916.     if (grouping_type != MKTAG( 'r','a','p',' '))

  1917.         return 0; /* only support 'rap ' grouping */

  1918.     if (version == 1)

  1919.         avio_rb32(pb); /* grouping_type_parameter */

  1920. 

  1921.     entries = avio_rb32(pb);

  1922.     if (!entries)

  1923.         return 0;

  1924.     if (entries >= UINT_MAX / sizeof(*sc->rap_group))

  1925.         return AVERROR_INVALIDDATA;

  1926.     sc->rap_group = av_malloc(entries * sizeof(*sc->rap_group));

  1927.     if (!sc->rap_group)

  1928.         return AVERROR(ENOMEM);

  1929. 

  1930.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1931.         sc->rap_group[i].count = avio_rb32(pb); /* sample_count */

  1932.         sc->rap_group[i].index = avio_rb32(pb); /* group_description_index */

  1933.     }

  1934. 

  1935.     sc->rap_group_count = i;

  1936. 

  1937.     return pb->eof_reached ? AVERROR_EOF : 0;

  1938. }

  1939. 

  1940. static void mov_build_index(MOVContext *mov, AVStream *st)

  1941. {

  1942.     MOVStreamContext *sc = st->priv_data;

  1943.     int64_t current_offset;

  1944.     int64_t current_dts = 0;

  1945.     unsigned int stts_index = 0;

  1946.     unsigned int stsc_index = 0;

  1947.     unsigned int stss_index = 0;

  1948.     unsigned int stps_index = 0;

  1949.     unsigned int i, j;

  1950.     uint64_t stream_size = 0;

  1951. 

  1952.     /* adjust first dts according to edit list */

  1953.     if (sc->time_offset && mov->time_scale > 0) {

  1954.         if (sc->time_offset < 0)

  1955.             sc->time_offset = av_rescale(sc->time_offset, sc->time_scale, mov->time_scale);

  1956.         current_dts = -sc->time_offset;

  1957.         if (sc->ctts_data && sc->stts_data && sc->stts_data[0].duration &&

  1958.             sc->ctts_data[0].duration / sc->stts_data[0].duration > 16) {

  1959.             /* more than 16 frames delay, dts are likely wrong

  1960.                this happens with files created by iMovie */

  1961.             sc->wrong_dts = 1;

  1962.             st->codec->has_b_frames = 1;

  1963.         }

  1964.     }

  1965. 

  1966.     /* only use old uncompressed audio chunk demuxing when stts specifies it */

  1967.     if (!(st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&

  1968.           sc->stts_count == 1 && sc->stts_data[0].duration == 1)) {

  1969.         unsigned int current_sample = 0;

  1970.         unsigned int stts_sample = 0;

  1971.         unsigned int sample_size;

  1972.         unsigned int distance = 0;

  1973.         unsigned int rap_group_index = 0;

  1974.         unsigned int rap_group_sample = 0;

  1975.         int rap_group_present = sc->rap_group_count && sc->rap_group;

  1976.         int key_off = (sc->keyframes && sc->keyframes[0] > 0) || (sc->stps_data && sc->stps_data[0] > 0);

  1977. 

  1978.         current_dts -= sc->dts_shift;

  1979. 

  1980.         if (!sc->sample_count)

  1981.             return;

  1982.         if (sc->sample_count >= UINT_MAX / sizeof(*st->index_entries) - st->nb_index_entries)

  1983.             return;

  1984.         if (av_reallocp_array(&st->index_entries,

  1985.                               st->nb_index_entries + sc->sample_count,

  1986.                               sizeof(*st->index_entries)) < 0) {

  1987.             st->nb_index_entries = 0;

  1988.             return;

  1989.         }

  1990.         st->index_entries_allocated_size = (st->nb_index_entries + sc->sample_count) * sizeof(*st->index_entries);

  1991. 

  1992.         for (i = 0; i < sc->chunk_count; i++) {

  1993.             current_offset = sc->chunk_offsets[i];

  1994.             while (stsc_index + 1 < sc->stsc_count &&

  1995.                 i + 1 == sc->stsc_data[stsc_index + 1].first)

  1996.                 stsc_index++;

  1997.             for (j = 0; j < sc->stsc_data[stsc_index].count; j++) {

  1998.                 int keyframe = 0;

  1999.                 if (current_sample >= sc->sample_count) {

  2000.                     av_log(mov->fc, AV_LOG_ERROR, "wrong sample count\n");

  2001.                     return;

  2002.                 }

  2003. 

  2004.                 if (!sc->keyframe_absent && (!sc->keyframe_count || current_sample+key_off == sc->keyframes[stss_index])) {

  2005.                     keyframe = 1;

  2006.                     if (stss_index + 1 < sc->keyframe_count)

  2007.                         stss_index++;

  2008.                 } else if (sc->stps_count && current_sample+key_off == sc->stps_data[stps_index]) {

  2009.                     keyframe = 1;

  2010.                     if (stps_index + 1 < sc->stps_count)

  2011.                         stps_index++;

  2012.                 }

  2013.                 if (rap_group_present && rap_group_index < sc->rap_group_count) {

  2014.                     if (sc->rap_group[rap_group_index].index > 0)

  2015.                         keyframe = 1;

  2016.                     if (++rap_group_sample == sc->rap_group[rap_group_index].count) {

  2017.                         rap_group_sample = 0;

  2018.                         rap_group_index++;

  2019.                     }

  2020.                 }

  2021.                 if (keyframe)

  2022.                     distance = 0;

  2023.                 sample_size = sc->sample_size > 0 ? sc->sample_size : sc->sample_sizes[current_sample];

  2024.                 if (sc->pseudo_stream_id == -1 ||

  2025.                    sc->stsc_data[stsc_index].id - 1 == sc->pseudo_stream_id) {

  2026.                     AVIndexEntry *e = &st->index_entries[st->nb_index_entries++];

  2027.                     e->pos = current_offset;

  2028.                     e->timestamp = current_dts;

  2029.                     e->size = sample_size;

  2030.                     e->min_distance = distance;

  2031.                     e->flags = keyframe ? AVINDEX_KEYFRAME : 0;

  2032.                     av_dlog(mov->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "

  2033.                             "size %d, distance %d, keyframe %d\n", st->index, current_sample,

  2034.                             current_offset, current_dts, sample_size, distance, keyframe);

  2035.                 }

  2036. 

  2037.                 current_offset += sample_size;

  2038.                 stream_size += sample_size;

  2039.                 current_dts += sc->stts_data[stts_index].duration;

  2040.                 distance++;

  2041.                 stts_sample++;

  2042.                 current_sample++;

  2043.                 if (stts_index + 1 < sc->stts_count && stts_sample == sc->stts_data[stts_index].count) {

  2044.                     stts_sample = 0;

  2045.                     stts_index++;

  2046.                 }

  2047.             }

  2048.         }

  2049.         if (st->duration > 0)

  2050.             st->codec->bit_rate = stream_size*8*sc->time_scale/st->duration;

  2051.     } else {

  2052.         unsigned chunk_samples, total = 0;

  2053. 

  2054.         // compute total chunk count

  2055.         for (i = 0; i < sc->stsc_count; i++) {

  2056.             unsigned count, chunk_count;

  2057. 

  2058.             chunk_samples = sc->stsc_data[i].count;

  2059.             if (i != sc->stsc_count - 1 &&

  2060.                 sc->samples_per_frame && chunk_samples % sc->samples_per_frame) {

  2061.                 av_log(mov->fc, AV_LOG_ERROR, "error unaligned chunk\n");

  2062.                 return;

  2063.             }

  2064. 

  2065.             if (sc->samples_per_frame >= 160) { // gsm

  2066.                 count = chunk_samples / sc->samples_per_frame;

  2067.             } else if (sc->samples_per_frame > 1) {

  2068.                 unsigned samples = (1024/sc->samples_per_frame)*sc->samples_per_frame;

  2069.                 count = (chunk_samples+samples-1) / samples;

  2070.             } else {

  2071.                 count = (chunk_samples+1023) / 1024;

  2072.             }

  2073. 

  2074.             if (i < sc->stsc_count - 1)

  2075.                 chunk_count = sc->stsc_data[i+1].first - sc->stsc_data[i].first;

  2076.             else

  2077.                 chunk_count = sc->chunk_count - (sc->stsc_data[i].first - 1);

  2078.             total += chunk_count * count;

  2079.         }

  2080. 

  2081.         av_dlog(mov->fc, "chunk count %d\n", total);

  2082.         if (total >= UINT_MAX / sizeof(*st->index_entries) - st->nb_index_entries)

  2083.             return;

  2084.         if (av_reallocp_array(&st->index_entries,

  2085.                               st->nb_index_entries + total,

  2086.                               sizeof(*st->index_entries)) < 0) {

  2087.             st->nb_index_entries = 0;

  2088.             return;

  2089.         }

  2090.         st->index_entries_allocated_size = (st->nb_index_entries + total) * sizeof(*st->index_entries);

  2091. 

  2092.         // populate index

  2093.         for (i = 0; i < sc->chunk_count; i++) {

  2094.             current_offset = sc->chunk_offsets[i];

  2095.             if (stsc_index + 1 < sc->stsc_count &&

  2096.                 i + 1 == sc->stsc_data[stsc_index + 1].first)

  2097.                 stsc_index++;

  2098.             chunk_samples = sc->stsc_data[stsc_index].count;

  2099. 

  2100.             while (chunk_samples > 0) {

  2101.                 AVIndexEntry *e;

  2102.                 unsigned size, samples;

  2103. 

  2104.                 if (sc->samples_per_frame >= 160) { // gsm

  2105.                     samples = sc->samples_per_frame;

  2106.                     size = sc->bytes_per_frame;

  2107.                 } else {

  2108.                     if (sc->samples_per_frame > 1) {

  2109.                         samples = FFMIN((1024 / sc->samples_per_frame)*

  2110.                                         sc->samples_per_frame, chunk_samples);

  2111.                         size = (samples / sc->samples_per_frame) * sc->bytes_per_frame;

  2112.                     } else {

  2113.                         samples = FFMIN(1024, chunk_samples);

  2114.                         size = samples * sc->sample_size;

  2115.                     }

  2116.                 }

  2117. 

  2118.                 if (st->nb_index_entries >= total) {

  2119.                     av_log(mov->fc, AV_LOG_ERROR, "wrong chunk count %d\n", total);

  2120.                     return;

  2121.                 }

  2122.                 e = &st->index_entries[st->nb_index_entries++];

  2123.                 e->pos = current_offset;

  2124.                 e->timestamp = current_dts;

  2125.                 e->size = size;

  2126.                 e->min_distance = 0;

  2127.                 e->flags = AVINDEX_KEYFRAME;

  2128.                 av_dlog(mov->fc, "AVIndex stream %d, chunk %d, offset %"PRIx64", dts %"PRId64", "

  2129.                         "size %d, duration %d\n", st->index, i, current_offset, current_dts,

  2130.                         size, samples);

  2131. 

  2132.                 current_offset += size;

  2133.                 current_dts += samples;

  2134.                 chunk_samples -= samples;

  2135.             }

  2136.         }

  2137.     }

  2138. }

  2139. 

  2140. static int mov_open_dref(AVIOContext **pb, char *src, MOVDref *ref,

  2141.                          AVIOInterruptCB *int_cb)

  2142. {

  2143.     /* try relative path, we do not try the absolute because it can leak information about our

  2144.        system to an attacker */

  2145.     if (ref->nlvl_to > 0 && ref->nlvl_from > 0) {

  2146.         char filename[1024];

  2147.         char *src_path;

  2148.         int i, l;

  2149. 

  2150.         /* find a source dir */

  2151.         src_path = strrchr(src, '/');

  2152.         if (src_path)

  2153.             src_path++;

  2154.         else

  2155.             src_path = src;

  2156. 

  2157.         /* find a next level down to target */

  2158.         for (i = 0, l = strlen(ref->path) - 1; l >= 0; l--)

  2159.             if (ref->path[l] == '/') {

  2160.                 if (i == ref->nlvl_to - 1)

  2161.                     break;

  2162.                 else

  2163.                     i++;

  2164.             }

  2165. 

  2166.         /* compose filename if next level down to target was found */

  2167.         if (i == ref->nlvl_to - 1 && src_path - src  < sizeof(filename)) {

  2168.             memcpy(filename, src, src_path - src);

  2169.             filename[src_path - src] = 0;

  2170. 

  2171.             for (i = 1; i < ref->nlvl_from; i++)

  2172.                 av_strlcat(filename, "../", 1024);

  2173. 

  2174.             av_strlcat(filename, ref->path + l + 1, 1024);

  2175. 

  2176.             if (!avio_open2(pb, filename, AVIO_FLAG_READ, int_cb, NULL))

  2177.                 return 0;

  2178.         }

  2179.     }

  2180. 

  2181.     return AVERROR(ENOENT);

  2182. }

  2183. 

  2184. static int mov_read_trak(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2185. {

  2186.     AVStream *st;

  2187.     MOVStreamContext *sc;

  2188.     int ret;

  2189. 

  2190.     st = avformat_new_stream(c->fc, NULL);

  2191.     if (!st) return AVERROR(ENOMEM);

  2192.     st->id = c->fc->nb_streams;

  2193.     sc = av_mallocz(sizeof(MOVStreamContext));

  2194.     if (!sc) return AVERROR(ENOMEM);

  2195. 

  2196.     st->priv_data = sc;

  2197.     st->codec->codec_type = AVMEDIA_TYPE_DATA;

  2198.     sc->ffindex = st->index;

  2199. 

  2200.     if ((ret = mov_read_default(c, pb, atom)) < 0)

  2201.         return ret;

  2202. 

  2203.     /* sanity checks */

  2204.     if (sc->chunk_count && (!sc->stts_count || !sc->stsc_count ||

  2205.                             (!sc->sample_size && !sc->sample_count))) {

  2206.         av_log(c->fc, AV_LOG_ERROR, "stream %d, missing mandatory atoms, broken header\n",

  2207.                st->index);

  2208.         return 0;

  2209.     }

  2210. 

  2211.     if (sc->time_scale <= 0) {

  2212.         av_log(c->fc, AV_LOG_WARNING, "stream %d, timescale not set\n", st->index);

  2213.         sc->time_scale = c->time_scale;

  2214.         if (sc->time_scale <= 0)

  2215.             sc->time_scale = 1;

  2216.     }

  2217. 

  2218.     avpriv_set_pts_info(st, 64, 1, sc->time_scale);

  2219. 

  2220.     mov_build_index(c, st);

  2221. 

  2222.     if (sc->dref_id-1 < sc->drefs_count && sc->drefs[sc->dref_id-1].path) {

  2223.         MOVDref *dref = &sc->drefs[sc->dref_id - 1];

  2224.         if (mov_open_dref(&sc->pb, c->fc->filename, dref, &c->fc->interrupt_callback) < 0)

  2225.             av_log(c->fc, AV_LOG_ERROR,

  2226.                    "stream %d, error opening alias: path='%s', dir='%s', "

  2227.                    "filename='%s', volume='%s', nlvl_from=%d, nlvl_to=%d\n",

  2228.                    st->index, dref->path, dref->dir, dref->filename,

  2229.                    dref->volume, dref->nlvl_from, dref->nlvl_to);

  2230.     } else

  2231.         sc->pb = c->fc->pb;

  2232. 

  2233.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  2234.         if (!st->sample_aspect_ratio.num &&

  2235.             (st->codec->width != sc->width || st->codec->height != sc->height)) {

  2236.             st->sample_aspect_ratio = av_d2q(((double)st->codec->height * sc->width) /

  2237.                                              ((double)st->codec->width * sc->height), INT_MAX);

  2238.         }

  2239.     }

  2240. 

  2241.     // done for ai5q, ai52, ai55, ai1q, ai12 and ai15.

  2242.     if (!st->codec->extradata_size && st->codec->codec_id == AV_CODEC_ID_H264 &&

  2243.         TAG_IS_AVCI(st->codec->codec_tag)) {

  2244.         ret = ff_generate_avci_extradata(st);

  2245.         if (ret < 0)

  2246.             return ret;

  2247.     }

  2248. 

  2249.     switch (st->codec->codec_id) {

  2250. #if CONFIG_H261_DECODER

  2251.     case AV_CODEC_ID_H261:

  2252. #endif

  2253. #if CONFIG_H263_DECODER

  2254.     case AV_CODEC_ID_H263:

  2255. #endif

  2256. #if CONFIG_MPEG4_DECODER

  2257.     case AV_CODEC_ID_MPEG4:

  2258. #endif

  2259.         st->codec->width = 0; /* let decoder init width/height */

  2260.         st->codec->height= 0;

  2261.         break;

  2262.     }

  2263. 

  2264.     /* Do not need those anymore. */

  2265.     av_freep(&sc->chunk_offsets);

  2266.     av_freep(&sc->stsc_data);

  2267.     av_freep(&sc->sample_sizes);

  2268.     av_freep(&sc->keyframes);

  2269.     av_freep(&sc->stts_data);

  2270.     av_freep(&sc->stps_data);

  2271.     av_freep(&sc->rap_group);

  2272. 

  2273.     return 0;

  2274. }

  2275. 

  2276. static int mov_read_ilst(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2277. {

  2278.     int ret;

  2279.     c->itunes_metadata = 1;

  2280.     ret = mov_read_default(c, pb, atom);

  2281.     c->itunes_metadata = 0;

  2282.     return ret;

  2283. }

  2284. 

  2285. static int mov_read_replaygain(MOVContext *c, AVIOContext *pb, int size)

  2286. {

  2287.     int64_t end = avio_tell(pb) + size;

  2288.     uint8_t *key = NULL, *val = NULL;

  2289.     int i;

  2290. 

  2291.     for (i = 0; i < 2; i++) {

  2292.         uint8_t **p;

  2293.         uint32_t len, tag;

  2294. 

  2295.         if (end - avio_tell(pb) <= 12)

  2296.             break;

  2297. 

  2298.         len = avio_rb32(pb);

  2299.         tag = avio_rl32(pb);

  2300.         avio_skip(pb, 4); // flags

  2301. 

  2302.         if (len < 12 || len - 12 > end - avio_tell(pb))

  2303.             break;

  2304.         len -= 12;

  2305. 

  2306.         if (tag == MKTAG('n', 'a', 'm', 'e'))

  2307.             p = &key;

  2308.         else if (tag == MKTAG('d', 'a', 't', 'a') && len > 4) {

  2309.             avio_skip(pb, 4);

  2310.             len -= 4;

  2311.             p = &val;

  2312.         } else

  2313.             break;

  2314. 

  2315.         *p = av_malloc(len + 1);

  2316.         if (!*p)

  2317.             break;

  2318.         avio_read(pb, *p, len);

  2319.         (*p)[len] = 0;

  2320.     }

  2321. 

  2322.     if (key && val) {

  2323.         av_dict_set(&c->fc->metadata, key, val,

  2324.                     AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL);

  2325.         key = val = NULL;

  2326.     }

  2327. 

  2328.     avio_seek(pb, end, SEEK_SET);

  2329.     av_freep(&key);

  2330.     av_freep(&val);

  2331.     return 0;

  2332. }

  2333. 

  2334. static int mov_read_custom(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2335. {

  2336.     int64_t end = avio_tell(pb) + atom.size;

  2337.     uint32_t tag, len;

  2338. 

  2339.     if (atom.size < 8)

  2340.         goto fail;

  2341. 

  2342.     len = avio_rb32(pb);

  2343.     tag = avio_rl32(pb);

  2344. 

  2345.     if (len > atom.size)

  2346.         goto fail;

  2347. 

  2348.     if (tag == MKTAG('m', 'e', 'a', 'n') && len > 12) {

  2349.         uint8_t domain[128];

  2350.         int domain_len;

  2351. 

  2352.         avio_skip(pb, 4); // flags

  2353.         len -= 12;

  2354. 

  2355.         domain_len = avio_get_str(pb, len, domain, sizeof(domain));

  2356.         avio_skip(pb, len - domain_len);

  2357.         if (!strcmp(domain, "org.hydrogenaudio.replaygain"))

  2358.             return mov_read_replaygain(c, pb, end - avio_tell(pb));

  2359.     }

  2360. 

  2361. fail:

  2362.     av_log(c->fc, AV_LOG_VERBOSE,

  2363.            "Unhandled or malformed custom metadata of size %"PRId64"\n", atom.size);

  2364.     return 0;

  2365. }

  2366. 

  2367. static int mov_read_meta(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2368. {

  2369.     while (atom.size > 8) {

  2370.         uint32_t tag = avio_rl32(pb);

  2371.         atom.size -= 4;

  2372.         if (tag == MKTAG('h','d','l','r')) {

  2373.             avio_seek(pb, -8, SEEK_CUR);

  2374.             atom.size += 8;

  2375.             return mov_read_default(c, pb, atom);

  2376.         }

  2377.     }

  2378.     return 0;

  2379. }

  2380. 

  2381. static int mov_read_tkhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2382. {

  2383.     int i;

  2384.     int width;

  2385.     int height;

  2386.     int64_t disp_transform[2];

  2387.     int display_matrix[3][3];

  2388.     AVStream *st;

  2389.     MOVStreamContext *sc;

  2390.     int version;

  2391.     int flags;

  2392. 

  2393.     if (c->fc->nb_streams < 1)

  2394.         return 0;

  2395.     st = c->fc->streams[c->fc->nb_streams-1];

  2396.     sc = st->priv_data;

  2397. 

  2398.     version = avio_r8(pb);

  2399.     flags = avio_rb24(pb);

  2400.     st->disposition |= (flags & MOV_TKHD_FLAG_ENABLED) ? AV_DISPOSITION_DEFAULT : 0;

  2401. 

  2402.     if (version == 1) {

  2403.         avio_rb64(pb);

  2404.         avio_rb64(pb);

  2405.     } else {

  2406.         avio_rb32(pb); /* creation time */

  2407.         avio_rb32(pb); /* modification time */

  2408.     }

  2409.     st->id = (int)avio_rb32(pb); /* track id (NOT 0 !)*/

  2410.     avio_rb32(pb); /* reserved */

  2411. 

  2412.     /* highlevel (considering edits) duration in movie timebase */

  2413.     (version == 1) ? avio_rb64(pb) : avio_rb32(pb);

  2414.     avio_rb32(pb); /* reserved */

  2415.     avio_rb32(pb); /* reserved */

  2416. 

  2417.     avio_rb16(pb); /* layer */

  2418.     avio_rb16(pb); /* alternate group */

  2419.     avio_rb16(pb); /* volume */

  2420.     avio_rb16(pb); /* reserved */

  2421. 

  2422.     //read in the display matrix (outlined in ISO 14496-12, Section 6.2.2)

  2423.     // they're kept in fixed point format through all calculations

  2424.     // save u,v,z to store the whole matrix in the AV_PKT_DATA_DISPLAYMATRIX

  2425.     // side data, but the scale factor is not needed to calculate aspect ratio

  2426.     for (i = 0; i < 3; i++) {

  2427.         display_matrix[i][0] = avio_rb32(pb);   // 16.16 fixed point

  2428.         display_matrix[i][1] = avio_rb32(pb);   // 16.16 fixed point

  2429.         display_matrix[i][2] = avio_rb32(pb);   //  2.30 fixed point

  2430.     }

  2431. 

  2432.     width = avio_rb32(pb);       // 16.16 fixed point track width

  2433.     height = avio_rb32(pb);      // 16.16 fixed point track height

  2434.     sc->width = width >> 16;

  2435.     sc->height = height >> 16;

  2436. 

  2437.     // save the matrix when it is not the default identity

  2438.     if (display_matrix[0][0] != (1 << 16) ||

  2439.         display_matrix[1][1] != (1 << 16) ||

  2440.         display_matrix[2][2] != (1 << 30) ||

  2441.         display_matrix[0][1] || display_matrix[0][2] ||

  2442.         display_matrix[1][0] || display_matrix[1][2] ||

  2443.         display_matrix[2][0] || display_matrix[2][1]) {

  2444.         int i, j;

  2445. 

  2446.         av_freep(&sc->display_matrix);

  2447.         sc->display_matrix = av_malloc(sizeof(int32_t) * 9);

  2448.         if (!sc->display_matrix)

  2449.             return AVERROR(ENOMEM);

  2450. 

  2451.         for (i = 0; i < 3; i++)

  2452.             for (j = 0; j < 3; j++)

  2453.                 sc->display_matrix[i * 3 + j] = display_matrix[j][i];

  2454.     }

  2455. 

  2456.     // transform the display width/height according to the matrix

  2457.     // skip this if the display matrix is the default identity matrix

  2458.     // or if it is rotating the picture, ex iPhone 3GS

  2459.     // to keep the same scale, use [width height 1<<16]

  2460.     if (width && height &&

  2461.         ((display_matrix[0][0] != 65536  ||

  2462.           display_matrix[1][1] != 65536) &&

  2463.          !display_matrix[0][1] &&

  2464.          !display_matrix[1][0] &&

  2465.          !display_matrix[2][0] && !display_matrix[2][1])) {

  2466.         for (i = 0; i < 2; i++)

  2467.             disp_transform[i] =

  2468.                 (int64_t)  width  * display_matrix[0][i] +

  2469.                 (int64_t)  height * display_matrix[1][i] +

  2470.                 ((int64_t) display_matrix[2][i] << 16);

  2471. 

  2472.         //sample aspect ratio is new width/height divided by old width/height

  2473.         st->sample_aspect_ratio = av_d2q(

  2474.             ((double) disp_transform[0] * height) /

  2475.             ((double) disp_transform[1] * width), INT_MAX);

  2476.     }

  2477.     return 0;

  2478. }

  2479. 

  2480. static int mov_read_tfhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2481. {

  2482.     MOVFragment *frag = &c->fragment;

  2483.     MOVTrackExt *trex = NULL;

  2484.     int flags, track_id, i;

  2485. 

  2486.     avio_r8(pb); /* version */

  2487.     flags = avio_rb24(pb);

  2488. 

  2489.     track_id = avio_rb32(pb);

  2490.     if (!track_id)

  2491.         return AVERROR_INVALIDDATA;

  2492.     frag->track_id = track_id;

  2493.     for (i = 0; i < c->trex_count; i++)

  2494.         if (c->trex_data[i].track_id == frag->track_id) {

  2495.             trex = &c->trex_data[i];

  2496.             break;

  2497.         }

  2498.     if (!trex) {

  2499.         av_log(c->fc, AV_LOG_ERROR, "could not find corresponding trex\n");

  2500.         return AVERROR_INVALIDDATA;

  2501.     }

  2502. 

  2503.     frag->base_data_offset = flags & MOV_TFHD_BASE_DATA_OFFSET ?

  2504.                              avio_rb64(pb) : flags & MOV_TFHD_DEFAULT_BASE_IS_MOOF ?

  2505.                              frag->moof_offset : frag->implicit_offset;

  2506.     frag->stsd_id  = flags & MOV_TFHD_STSD_ID ? avio_rb32(pb) : trex->stsd_id;

  2507. 

  2508.     frag->duration = flags & MOV_TFHD_DEFAULT_DURATION ?

  2509.                      avio_rb32(pb) : trex->duration;

  2510.     frag->size     = flags & MOV_TFHD_DEFAULT_SIZE ?

  2511.                      avio_rb32(pb) : trex->size;

  2512.     frag->flags    = flags & MOV_TFHD_DEFAULT_FLAGS ?

  2513.                      avio_rb32(pb) : trex->flags;

  2514.     av_dlog(c->fc, "frag flags 0x%x\n", frag->flags);

  2515.     return 0;

  2516. }

  2517. 

  2518. static int mov_read_chap(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2519. {

  2520.     c->chapter_track = avio_rb32(pb);

  2521.     return 0;

  2522. }

  2523. 

  2524. static int mov_read_trex(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2525. {

  2526.     MOVTrackExt *trex;

  2527.     int err;

  2528. 

  2529.     if ((uint64_t)c->trex_count+1 >= UINT_MAX / sizeof(*c->trex_data))

  2530.         return AVERROR_INVALIDDATA;

  2531.     if ((err = av_reallocp_array(&c->trex_data, c->trex_count + 1,

  2532.                                  sizeof(*c->trex_data))) < 0) {

  2533.         c->trex_count = 0;

  2534.         return err;

  2535.     }

  2536.     trex = &c->trex_data[c->trex_count++];

  2537.     avio_r8(pb); /* version */

  2538.     avio_rb24(pb); /* flags */

  2539.     trex->track_id = avio_rb32(pb);

  2540.     trex->stsd_id  = avio_rb32(pb);

  2541.     trex->duration = avio_rb32(pb);

  2542.     trex->size     = avio_rb32(pb);

  2543.     trex->flags    = avio_rb32(pb);

  2544.     return 0;

  2545. }

  2546. 

  2547. static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2548. {

  2549.     MOVFragment *frag = &c->fragment;

  2550.     AVStream *st = NULL;

  2551.     MOVStreamContext *sc;

  2552.     MOVStts *ctts_data;

  2553.     uint64_t offset;

  2554.     int64_t dts;

  2555.     int data_offset = 0;

  2556.     unsigned entries, first_sample_flags = frag->flags;

  2557.     int flags, distance, i, found_keyframe = 0, err;

  2558. 

  2559.     for (i = 0; i < c->fc->nb_streams; i++) {

  2560.         if (c->fc->streams[i]->id == frag->track_id) {

  2561.             st = c->fc->streams[i];

  2562.             break;

  2563.         }

  2564.     }

  2565.     if (!st) {

  2566.         av_log(c->fc, AV_LOG_ERROR, "could not find corresponding track id %d\n", frag->track_id);

  2567.         return AVERROR_INVALIDDATA;

  2568.     }

  2569.     sc = st->priv_data;

  2570.     if (sc->pseudo_stream_id+1 != frag->stsd_id)

  2571.         return 0;

  2572.     avio_r8(pb); /* version */

  2573.     flags = avio_rb24(pb);

  2574.     entries = avio_rb32(pb);

  2575.     av_dlog(c->fc, "flags 0x%x entries %d\n", flags, entries);

  2576. 

  2577.     /* Always assume the presence of composition time offsets.

  2578.      * Without this assumption, for instance, we cannot deal with a track in fragmented movies that meet the following.

  2579.      *  1) in the initial movie, there are no samples.

  2580.      *  2) in the first movie fragment, there is only one sample without composition time offset.

  2581.      *  3) in the subsequent movie fragments, there are samples with composition time offset. */

  2582.     if (!sc->ctts_count && sc->sample_count)

  2583.     {

  2584.         /* Complement ctts table if moov atom doesn't have ctts atom. */

  2585.         ctts_data = av_realloc(NULL, sizeof(*sc->ctts_data));

  2586.         if (!ctts_data)

  2587.             return AVERROR(ENOMEM);

  2588.         sc->ctts_data = ctts_data;

  2589.         sc->ctts_data[sc->ctts_count].count = sc->sample_count;

  2590.         sc->ctts_data[sc->ctts_count].duration = 0;

  2591.         sc->ctts_count++;

  2592.     }

  2593.     if ((uint64_t)entries+sc->ctts_count >= UINT_MAX/sizeof(*sc->ctts_data))

  2594.         return AVERROR_INVALIDDATA;

  2595.     if ((err = av_reallocp_array(&sc->ctts_data, entries + sc->ctts_count,

  2596.                                  sizeof(*sc->ctts_data))) < 0) {

  2597.         sc->ctts_count = 0;

  2598.         return err;

  2599.     }

  2600.     if (flags & MOV_TRUN_DATA_OFFSET)        data_offset        = avio_rb32(pb);

  2601.     if (flags & MOV_TRUN_FIRST_SAMPLE_FLAGS) first_sample_flags = avio_rb32(pb);

  2602.     dts    = sc->track_end - sc->time_offset;

  2603.     offset = frag->base_data_offset + data_offset;

  2604.     distance = 0;

  2605.     av_dlog(c->fc, "first sample flags 0x%x\n", first_sample_flags);

  2606.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  2607.         unsigned sample_size = frag->size;

  2608.         int sample_flags = i ? frag->flags : first_sample_flags;

  2609.         unsigned sample_duration = frag->duration;

  2610.         int keyframe = 0;

  2611. 

  2612.         if (flags & MOV_TRUN_SAMPLE_DURATION) sample_duration = avio_rb32(pb);

  2613.         if (flags & MOV_TRUN_SAMPLE_SIZE)     sample_size     = avio_rb32(pb);

  2614.         if (flags & MOV_TRUN_SAMPLE_FLAGS)    sample_flags    = avio_rb32(pb);

  2615.         sc->ctts_data[sc->ctts_count].count = 1;

  2616.         sc->ctts_data[sc->ctts_count].duration = (flags & MOV_TRUN_SAMPLE_CTS) ?

  2617.                                                   avio_rb32(pb) : 0;

  2618.         sc->ctts_count++;

  2619.         if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)

  2620.             keyframe = 1;

  2621.         else if (!found_keyframe)

  2622.             keyframe = found_keyframe =

  2623.                 !(sample_flags & (MOV_FRAG_SAMPLE_FLAG_IS_NON_SYNC |

  2624.                                   MOV_FRAG_SAMPLE_FLAG_DEPENDS_YES));

  2625.         if (keyframe)

  2626.             distance = 0;

  2627.         av_add_index_entry(st, offset, dts, sample_size, distance,

  2628.                            keyframe ? AVINDEX_KEYFRAME : 0);

  2629.         av_dlog(c->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "

  2630.                 "size %d, distance %d, keyframe %d\n", st->index, sc->sample_count+i,

  2631.                 offset, dts, sample_size, distance, keyframe);

  2632.         distance++;

  2633.         dts += sample_duration;

  2634.         offset += sample_size;

  2635.         sc->data_size += sample_size;

  2636.     }

  2637. 

  2638.     if (pb->eof_reached)

  2639.         return AVERROR_EOF;

  2640. 

  2641.     frag->implicit_offset = offset;

  2642.     st->duration = sc->track_end = dts + sc->time_offset;

  2643.     return 0;

  2644. }

  2645. 

  2646. /* this atom should be null (from specs), but some buggy files put the 'moov' atom inside it... */

  2647. /* like the files created with Adobe Premiere 5.0, for samples see */

  2648. /* http://graphics.tudelft.nl/~wouter/publications/soundtests/ */

  2649. static int mov_read_wide(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2650. {

  2651.     int err;

  2652. 

  2653.     if (atom.size < 8)

  2654.         return 0; /* continue */

  2655.     if (avio_rb32(pb) != 0) { /* 0 sized mdat atom... use the 'wide' atom size */

  2656.         avio_skip(pb, atom.size - 4);

  2657.         return 0;

  2658.     }

  2659.     atom.type = avio_rl32(pb);

  2660.     atom.size -= 8;

  2661.     if (atom.type != MKTAG('m','d','a','t')) {

  2662.         avio_skip(pb, atom.size);

  2663.         return 0;

  2664.     }

  2665.     err = mov_read_mdat(c, pb, atom);

  2666.     return err;

  2667. }

  2668. 

  2669. static int mov_read_cmov(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2670. {

  2671. #if CONFIG_ZLIB

  2672.     AVIOContext ctx;

  2673.     uint8_t *cmov_data;

  2674.     uint8_t *moov_data; /* uncompressed data */

  2675.     long cmov_len, moov_len;

  2676.     int ret = -1;

  2677. 

  2678.     avio_rb32(pb); /* dcom atom */

  2679.     if (avio_rl32(pb) != MKTAG('d','c','o','m'))

  2680.         return AVERROR_INVALIDDATA;

  2681.     if (avio_rl32(pb) != MKTAG('z','l','i','b')) {

  2682.         av_log(c->fc, AV_LOG_ERROR, "unknown compression for cmov atom !");

  2683.         return AVERROR_INVALIDDATA;

  2684.     }

  2685.     avio_rb32(pb); /* cmvd atom */

  2686.     if (avio_rl32(pb) != MKTAG('c','m','v','d'))

  2687.         return AVERROR_INVALIDDATA;

  2688.     moov_len = avio_rb32(pb); /* uncompressed size */

  2689.     cmov_len = atom.size - 6 * 4;

  2690. 

  2691.     cmov_data = av_malloc(cmov_len);

  2692.     if (!cmov_data)

  2693.         return AVERROR(ENOMEM);

  2694.     moov_data = av_malloc(moov_len);

  2695.     if (!moov_data) {

  2696.         av_free(cmov_data);

  2697.         return AVERROR(ENOMEM);

  2698.     }

  2699.     avio_read(pb, cmov_data, cmov_len);

  2700.     if (uncompress (moov_data, (uLongf *) &moov_len, (const Bytef *)cmov_data, cmov_len) != Z_OK)

  2701.         goto free_and_return;

  2702.     if (ffio_init_context(&ctx, moov_data, moov_len, 0, NULL, NULL, NULL, NULL) != 0)

  2703.         goto free_and_return;

  2704.     atom.type = MKTAG('m','o','o','v');

  2705.     atom.size = moov_len;

  2706.     ret = mov_read_default(c, &ctx, atom);

  2707. free_and_return:

  2708.     av_free(moov_data);

  2709.     av_free(cmov_data);

  2710.     return ret;

  2711. #else

  2712.     av_log(c->fc, AV_LOG_ERROR, "this file requires zlib support compiled in\n");

  2713.     return AVERROR(ENOSYS);

  2714. #endif

  2715. }

  2716. 

  2717. /* edit list atom */

  2718. static int mov_read_elst(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2719. {

  2720.     MOVStreamContext *sc;

  2721.     int i, edit_count, version;

  2722. 

  2723.     if (c->fc->nb_streams < 1)

  2724.         return 0;

  2725.     sc = c->fc->streams[c->fc->nb_streams-1]->priv_data;

  2726. 

  2727.     version = avio_r8(pb); /* version */

  2728.     avio_rb24(pb); /* flags */

  2729.     edit_count = avio_rb32(pb); /* entries */

  2730. 

  2731.     if ((uint64_t)edit_count*12+8 > atom.size)

  2732.         return AVERROR_INVALIDDATA;

  2733. 

  2734.     for (i=0; i<edit_count; i++){

  2735.         int64_t time;

  2736.         int64_t duration;

  2737.         if (version == 1) {

  2738.             duration = avio_rb64(pb);

  2739.             time     = avio_rb64(pb);

  2740.         } else {

  2741.             duration = avio_rb32(pb); /* segment duration */

  2742.             time     = (int32_t)avio_rb32(pb); /* media time */

  2743.         }

  2744.         avio_rb32(pb); /* Media rate */

  2745.         if (i == 0 && time >= -1) {

  2746.             sc->time_offset = time != -1 ? time : -duration;

  2747.         }

  2748.     }

  2749. 

  2750.     if (edit_count > 1)

  2751.         av_log(c->fc, AV_LOG_WARNING, "multiple edit list entries, "

  2752.                "a/v desync might occur, patch welcome\n");

  2753. 

  2754.     av_dlog(c->fc, "track[%i].edit_count = %i\n", c->fc->nb_streams-1, edit_count);

  2755.     return 0;

  2756. }

  2757. 

  2758. static const MOVParseTableEntry mov_default_parse_table[] = {

  2759. { MKTAG('a','v','s','s'), mov_read_extradata },

  2760. { MKTAG('c','h','p','l'), mov_read_chpl },

  2761. { MKTAG('c','o','6','4'), mov_read_stco },

  2762. { MKTAG('c','t','t','s'), mov_read_ctts }, /* composition time to sample */

  2763. { MKTAG('d','i','n','f'), mov_read_default },

  2764. { MKTAG('d','r','e','f'), mov_read_dref },

  2765. { MKTAG('e','d','t','s'), mov_read_default },

  2766. { MKTAG('e','l','s','t'), mov_read_elst },

  2767. { MKTAG('e','n','d','a'), mov_read_enda },

  2768. { MKTAG('f','i','e','l'), mov_read_fiel },

  2769. { MKTAG('f','t','y','p'), mov_read_ftyp },

  2770. { MKTAG('g','l','b','l'), mov_read_glbl },

  2771. { MKTAG('h','d','l','r'), mov_read_hdlr },

  2772. { MKTAG('i','l','s','t'), mov_read_ilst },

  2773. { MKTAG('j','p','2','h'), mov_read_extradata },

  2774. { MKTAG('m','d','a','t'), mov_read_mdat },

  2775. { MKTAG('m','d','h','d'), mov_read_mdhd },

  2776. { MKTAG('m','d','i','a'), mov_read_default },

  2777. { MKTAG('m','e','t','a'), mov_read_meta },

  2778. { MKTAG('m','i','n','f'), mov_read_default },

  2779. { MKTAG('m','o','o','f'), mov_read_moof },

  2780. { MKTAG('m','o','o','v'), mov_read_moov },

  2781. { MKTAG('m','v','e','x'), mov_read_default },

  2782. { MKTAG('m','v','h','d'), mov_read_mvhd },

  2783. { MKTAG('S','M','I',' '), mov_read_smi }, /* Sorenson extension ??? */

  2784. { MKTAG('a','l','a','c'), mov_read_extradata }, /* alac specific atom */

  2785. { MKTAG('a','v','c','C'), mov_read_glbl },

  2786. { MKTAG('p','a','s','p'), mov_read_pasp },

  2787. { MKTAG('s','t','b','l'), mov_read_default },

  2788. { MKTAG('s','t','c','o'), mov_read_stco },

  2789. { MKTAG('s','t','p','s'), mov_read_stps },

  2790. { MKTAG('s','t','r','f'), mov_read_strf },

  2791. { MKTAG('s','t','s','c'), mov_read_stsc },

  2792. { MKTAG('s','t','s','d'), mov_read_stsd }, /* sample description */

  2793. { MKTAG('s','t','s','s'), mov_read_stss }, /* sync sample */

  2794. { MKTAG('s','t','s','z'), mov_read_stsz }, /* sample size */

  2795. { MKTAG('s','t','t','s'), mov_read_stts },

  2796. { MKTAG('s','t','z','2'), mov_read_stsz }, /* compact sample size */

  2797. { MKTAG('t','k','h','d'), mov_read_tkhd }, /* track header */

  2798. { MKTAG('t','f','h','d'), mov_read_tfhd }, /* track fragment header */

  2799. { MKTAG('t','r','a','k'), mov_read_trak },

  2800. { MKTAG('t','r','a','f'), mov_read_default },

  2801. { MKTAG('t','r','e','f'), mov_read_default },

  2802. { MKTAG('c','h','a','p'), mov_read_chap },

  2803. { MKTAG('t','r','e','x'), mov_read_trex },

  2804. { MKTAG('t','r','u','n'), mov_read_trun },

  2805. { MKTAG('u','d','t','a'), mov_read_default },

  2806. { MKTAG('w','a','v','e'), mov_read_wave },

  2807. { MKTAG('e','s','d','s'), mov_read_esds },

  2808. { MKTAG('d','a','c','3'), mov_read_dac3 }, /* AC-3 info */

  2809. { MKTAG('d','e','c','3'), mov_read_dec3 }, /* EAC-3 info */

  2810. { MKTAG('w','i','d','e'), mov_read_wide }, /* place holder */

  2811. { MKTAG('w','f','e','x'), mov_read_wfex },

  2812. { MKTAG('c','m','o','v'), mov_read_cmov },

  2813. { MKTAG('c','h','a','n'), mov_read_chan }, /* channel layout */

  2814. { MKTAG('d','v','c','1'), mov_read_dvc1 },

  2815. { MKTAG('s','b','g','p'), mov_read_sbgp },

  2816. { MKTAG('h','v','c','C'), mov_read_glbl },

  2817. { MKTAG('-','-','-','-'), mov_read_custom },

  2818. { 0, NULL }

  2819. };

  2820. 

  2821. static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2822. {

  2823.     int64_t total_size = 0;

  2824.     MOVAtom a;

  2825.     int i;

  2826. 

  2827.     if (atom.size < 0)

  2828.         atom.size = INT64_MAX;

  2829.     while (total_size + 8 < atom.size && !pb->eof_reached) {

  2830.         int (*parse)(MOVContext*, AVIOContext*, MOVAtom) = NULL;

  2831.         a.size = atom.size;

  2832.         a.type=0;

  2833.         if (atom.size >= 8) {

  2834.             a.size = avio_rb32(pb);

  2835.             a.type = avio_rl32(pb);

  2836.         }

  2837.         av_dlog(c->fc, "type: %08x '%.4s' parent:'%.4s' sz: %"PRId64" %"PRId64" %"PRId64"\n",

  2838.                 a.type, (char*)&a.type, (char*)&atom.type, a.size, total_size, atom.size);

  2839.         total_size += 8;

  2840.         if (a.size == 1) { /* 64 bit extended size */

  2841.             a.size = avio_rb64(pb) - 8;

  2842.             total_size += 8;

  2843.         }

  2844.         if (a.size == 0) {

  2845.             a.size = atom.size - total_size;

  2846.             if (a.size <= 8)

  2847.                 break;

  2848.         }

  2849.         a.size -= 8;

  2850.         if (a.size < 0)

  2851.             break;

  2852.         a.size = FFMIN(a.size, atom.size - total_size);

  2853. 

  2854.         for (i = 0; mov_default_parse_table[i].type; i++)

  2855.             if (mov_default_parse_table[i].type == a.type) {

  2856.                 parse = mov_default_parse_table[i].parse;

  2857.                 break;

  2858.             }

  2859. 

  2860.         // container is user data

  2861.         if (!parse && (atom.type == MKTAG('u','d','t','a') ||

  2862.                        atom.type == MKTAG('i','l','s','t')))

  2863.             parse = mov_read_udta_string;

  2864. 

  2865.         if (!parse) { /* skip leaf atoms data */

  2866.             avio_skip(pb, a.size);

  2867.         } else {

  2868.             int64_t start_pos = avio_tell(pb);

  2869.             int64_t left;

  2870.             int err = parse(c, pb, a);

  2871.             if (err < 0)

  2872.                 return err;

  2873.             if (c->found_moov && c->found_mdat &&

  2874.                 ((!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX) ||

  2875.                  start_pos + a.size == avio_size(pb))) {

  2876.                 if (!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX)

  2877.                     c->next_root_atom = start_pos + a.size;

  2878.                 return 0;

  2879.             }

  2880.             left = a.size - avio_tell(pb) + start_pos;

  2881.             if (left > 0) /* skip garbage at atom end */

  2882.                 avio_skip(pb, left);

  2883.             else if (left < 0) {

  2884.                 av_log(c->fc, AV_LOG_WARNING,

  2885.                        "overread end of atom '%.4s' by %"PRId64" bytes\n",

  2886.                        (char*)&a.type, -left);

  2887.                 avio_seek(pb, left, SEEK_CUR);

  2888.             }

  2889.         }

  2890. 

  2891.         total_size += a.size;

  2892.     }

  2893. 

  2894.     if (total_size < atom.size && atom.size < 0x7ffff)

  2895.         avio_skip(pb, atom.size - total_size);

  2896. 

  2897.     return 0;

  2898. }

  2899. 

  2900. static int mov_probe(AVProbeData *p)

  2901. {

  2902.     unsigned int offset;

  2903.     uint32_t tag;

  2904.     int score = 0;

  2905. 

  2906.     /* check file header */

  2907.     offset = 0;

  2908.     for (;;) {

  2909.         /* ignore invalid offset */

  2910.         if ((offset + 8) > (unsigned int)p->buf_size)

  2911.             return score;

  2912.         tag = AV_RL32(p->buf + offset + 4);

  2913.         switch(tag) {

  2914.         /* check for obvious tags */

  2915.         case MKTAG('j','P',' ',' '): /* jpeg 2000 signature */

  2916.         case MKTAG('m','o','o','v'):

  2917.         case MKTAG('m','d','a','t'):

  2918.         case MKTAG('p','n','o','t'): /* detect movs with preview pics like ew.mov and april.mov */

  2919.         case MKTAG('u','d','t','a'): /* Packet Video PVAuthor adds this and a lot of more junk */

  2920.         case MKTAG('f','t','y','p'):

  2921.             return AVPROBE_SCORE_MAX;

  2922.         /* those are more common words, so rate then a bit less */

  2923.         case MKTAG('e','d','i','w'): /* xdcam files have reverted first tags */

  2924.         case MKTAG('w','i','d','e'):

  2925.         case MKTAG('f','r','e','e'):

  2926.         case MKTAG('j','u','n','k'):

  2927.         case MKTAG('p','i','c','t'):

  2928.             return AVPROBE_SCORE_MAX - 5;

  2929.         case MKTAG(0x82,0x82,0x7f,0x7d):

  2930.         case MKTAG('s','k','i','p'):

  2931.         case MKTAG('u','u','i','d'):

  2932.         case MKTAG('p','r','f','l'):

  2933.             offset = AV_RB32(p->buf+offset) + offset;

  2934.             /* if we only find those cause probedata is too small at least rate them */

  2935.             score = AVPROBE_SCORE_EXTENSION;

  2936.             break;

  2937.         default:

  2938.             /* unrecognized tag */

  2939.             return score;

  2940.         }

  2941.     }

  2942. }

  2943. 

  2944. // must be done after parsing all trak because there's no order requirement

  2945. static void mov_read_chapters(AVFormatContext *s)

  2946. {

  2947.     MOVContext *mov = s->priv_data;

  2948.     AVStream *st = NULL;

  2949.     MOVStreamContext *sc;

  2950.     int64_t cur_pos;

  2951.     int i;

  2952. 

  2953.     for (i = 0; i < s->nb_streams; i++)

  2954.         if (s->streams[i]->id == mov->chapter_track) {

  2955.             st = s->streams[i];

  2956.             break;

  2957.         }

  2958.     if (!st) {

  2959.         av_log(s, AV_LOG_ERROR, "Referenced QT chapter track not found\n");

  2960.         return;

  2961.     }

  2962. 

  2963.     st->discard = AVDISCARD_ALL;

  2964.     sc = st->priv_data;

  2965.     cur_pos = avio_tell(sc->pb);

  2966. 

  2967.     for (i = 0; i < st->nb_index_entries; i++) {

  2968.         AVIndexEntry *sample = &st->index_entries[i];

  2969.         int64_t end = i+1 < st->nb_index_entries ? st->index_entries[i+1].timestamp : st->duration;

  2970.         uint8_t *title;

  2971.         uint16_t ch;

  2972.         int len, title_len;

  2973. 

  2974.         if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {

  2975.             av_log(s, AV_LOG_ERROR, "Chapter %d not found in file\n", i);

  2976.             goto finish;

  2977.         }

  2978. 

  2979.         // the first two bytes are the length of the title

  2980.         len = avio_rb16(sc->pb);

  2981.         if (len > sample->size-2)

  2982.             continue;

  2983.         title_len = 2*len + 1;

  2984.         if (!(title = av_mallocz(title_len)))

  2985.             goto finish;

  2986. 

  2987.         // The samples could theoretically be in any encoding if there's an encd

  2988.         // atom following, but in practice are only utf-8 or utf-16, distinguished

  2989.         // instead by the presence of a BOM

  2990.         if (!len) {

  2991.             title[0] = 0;

  2992.         } else {

  2993.             ch = avio_rb16(sc->pb);

  2994.             if (ch == 0xfeff)

  2995.                 avio_get_str16be(sc->pb, len, title, title_len);

  2996.             else if (ch == 0xfffe)

  2997.                 avio_get_str16le(sc->pb, len, title, title_len);

  2998.             else {

  2999.                 AV_WB16(title, ch);

  3000.                 if (len == 1 || len == 2)

  3001.                     title[len] = 0;

  3002.                 else

  3003.                     avio_get_str(sc->pb, len - 2, title + 2, title_len - 2);

  3004.             }

  3005.         }

  3006. 

  3007.         avpriv_new_chapter(s, i, st->time_base, sample->timestamp, end, title);

  3008.         av_freep(&title);

  3009.     }

  3010. finish:

  3011.     avio_seek(sc->pb, cur_pos, SEEK_SET);

  3012. }

  3013. 

  3014. static int mov_read_close(AVFormatContext *s)

  3015. {

  3016.     MOVContext *mov = s->priv_data;

  3017.     int i, j;

  3018. 

  3019.     for (i = 0; i < s->nb_streams; i++) {

  3020.         AVStream *st = s->streams[i];

  3021.         MOVStreamContext *sc = st->priv_data;

  3022. 

  3023.         av_freep(&sc->ctts_data);

  3024.         for (j = 0; j < sc->drefs_count; j++) {

  3025.             av_freep(&sc->drefs[j].path);

  3026.             av_freep(&sc->drefs[j].dir);

  3027.         }

  3028.         av_freep(&sc->drefs);

  3029.         if (sc->pb && sc->pb != s->pb)

  3030.             avio_close(sc->pb);

  3031. 

  3032.         av_freep(&sc->chunk_offsets);

  3033.         av_freep(&sc->stsc_data);

  3034.         av_freep(&sc->sample_sizes);

  3035.         av_freep(&sc->keyframes);

  3036.         av_freep(&sc->stts_data);

  3037.         av_freep(&sc->stps_data);

  3038.         av_freep(&sc->rap_group);

  3039.         av_freep(&sc->display_matrix);

  3040.     }

  3041. 

  3042.     if (mov->dv_demux) {

  3043.         avformat_free_context(mov->dv_fctx);

  3044.         mov->dv_fctx = NULL;

  3045.     }

  3046. 

  3047.     av_freep(&mov->trex_data);

  3048. 

  3049.     return 0;

  3050. }

  3051. 

  3052. static int mov_read_header(AVFormatContext *s)

  3053. {

  3054.     MOVContext *mov = s->priv_data;

  3055.     AVIOContext *pb = s->pb;

  3056.     int err;

  3057.     MOVAtom atom = { AV_RL32("root") };

  3058.     int i;

  3059. 

  3060.     mov->fc = s;

  3061.     /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */

  3062.     if (pb->seekable)

  3063.         atom.size = avio_size(pb);

  3064.     else

  3065.         atom.size = INT64_MAX;

  3066. 

  3067.     /* check MOV header */

  3068.     if ((err = mov_read_default(mov, pb, atom)) < 0) {

  3069.         av_log(s, AV_LOG_ERROR, "error reading header: %d\n", err);

  3070.         mov_read_close(s);

  3071.         return err;

  3072.     }

  3073.     if (!mov->found_moov) {

  3074.         av_log(s, AV_LOG_ERROR, "moov atom not found\n");

  3075.         mov_read_close(s);

  3076.         return AVERROR_INVALIDDATA;

  3077.     }

  3078.     av_dlog(mov->fc, "on_parse_exit_offset=%"PRId64"\n", avio_tell(pb));

  3079. 

  3080.     if (pb->seekable && mov->chapter_track > 0)

  3081.         mov_read_chapters(s);

  3082. 

  3083.     for (i = 0; i < s->nb_streams; i++) {

  3084.         AVStream *st = s->streams[i];

  3085.         MOVStreamContext *sc = st->priv_data;

  3086. 

  3087.         if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {

  3088.             if (st->codec->width <= 0 && st->codec->width <= 0) {

  3089.                 st->codec->width  = sc->width;

  3090.                 st->codec->height = sc->height;

  3091.             }

  3092.             if (st->codec->codec_id == AV_CODEC_ID_DVD_SUBTITLE) {

  3093.                 if ((err = mov_rewrite_dvd_sub_extradata(st)) < 0)

  3094.                     return err;

  3095.             }

  3096.         }

  3097.     }

  3098. 

  3099.     if (mov->trex_data) {

  3100.         for (i = 0; i < s->nb_streams; i++) {

  3101.             AVStream *st = s->streams[i];

  3102.             MOVStreamContext *sc = st->priv_data;

  3103.             if (st->duration > 0)

  3104.                 st->codec->bit_rate = sc->data_size * 8 * sc->time_scale / st->duration;

  3105.         }

  3106.     }

  3107. 

  3108.     for (i = 0; i < s->nb_streams; i++) {

  3109.         AVStream *st = s->streams[i];

  3110.         MOVStreamContext *sc = st->priv_data;

  3111. 

  3112.         switch (st->codec->codec_type) {

  3113.         case AVMEDIA_TYPE_AUDIO:

  3114.             err = ff_replaygain_export(st, s->metadata);

  3115.             if (err < 0) {

  3116.                 mov_read_close(s);

  3117.                 return err;

  3118.             }

  3119.             break;

  3120.         case AVMEDIA_TYPE_VIDEO:

  3121.             if (sc->display_matrix) {

  3122.                 AVPacketSideData *sd, *tmp;

  3123. 

  3124.                 tmp = av_realloc_array(st->side_data,

  3125.                                        st->nb_side_data + 1, sizeof(*tmp));

  3126.                 if (!tmp)

  3127.                     return AVERROR(ENOMEM);

  3128. 

  3129.                 st->side_data = tmp;

  3130.                 st->nb_side_data++;

  3131. 

  3132.                 sd = &st->side_data[st->nb_side_data - 1];

  3133.                 sd->type = AV_PKT_DATA_DISPLAYMATRIX;

  3134.                 sd->size = sizeof(int32_t) * 9;

  3135.                 sd->data = (uint8_t*)sc->display_matrix;

  3136.                 sc->display_matrix = NULL;

  3137.             }

  3138.             break;

  3139.         }

  3140.     }

  3141. 

  3142.     return 0;

  3143. }

  3144. 

  3145. static AVIndexEntry *mov_find_next_sample(AVFormatContext *s, AVStream **st)

  3146. {

  3147.     AVIndexEntry *sample = NULL;

  3148.     int64_t best_dts = INT64_MAX;

  3149.     int i;

  3150.     for (i = 0; i < s->nb_streams; i++) {

  3151.         AVStream *avst = s->streams[i];

  3152.         MOVStreamContext *msc = avst->priv_data;

  3153.         if (msc->pb && msc->current_sample < avst->nb_index_entries) {

  3154.             AVIndexEntry *current_sample = &avst->index_entries[msc->current_sample];

  3155.             int64_t dts = av_rescale(current_sample->timestamp, AV_TIME_BASE, msc->time_scale);

  3156.             av_dlog(s, "stream %d, sample %d, dts %"PRId64"\n", i, msc->current_sample, dts);

  3157.             if (!sample || (!s->pb->seekable && current_sample->pos < sample->pos) ||

  3158.                 (s->pb->seekable &&

  3159.                  ((msc->pb != s->pb && dts < best_dts) || (msc->pb == s->pb &&

  3160.                  ((FFABS(best_dts - dts) <= AV_TIME_BASE && current_sample->pos < sample->pos) ||

  3161.                   (FFABS(best_dts - dts) > AV_TIME_BASE && dts < best_dts)))))) {

  3162.                 sample = current_sample;

  3163.                 best_dts = dts;

  3164.                 *st = avst;

  3165.             }

  3166.         }

  3167.     }

  3168.     return sample;

  3169. }

  3170. 

  3171. static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)

  3172. {

  3173.     MOVContext *mov = s->priv_data;

  3174.     MOVStreamContext *sc;

  3175.     AVIndexEntry *sample;

  3176.     AVStream *st = NULL;

  3177.     int ret;

  3178.  retry:

  3179.     sample = mov_find_next_sample(s, &st);

  3180.     if (!sample) {

  3181.         mov->found_mdat = 0;

  3182.         if (!mov->next_root_atom)

  3183.             return AVERROR_EOF;

  3184.         avio_seek(s->pb, mov->next_root_atom, SEEK_SET);

  3185.         mov->next_root_atom = 0;

  3186.         if (mov_read_default(mov, s->pb, (MOVAtom){ AV_RL32("root"), INT64_MAX }) < 0 ||

  3187.             s->pb->eof_reached)

  3188.             return AVERROR_EOF;

  3189.         av_dlog(s, "read fragments, offset 0x%"PRIx64"\n", avio_tell(s->pb));

  3190.         goto retry;

  3191.     }

  3192.     sc = st->priv_data;

  3193.     /* must be done just before reading, to avoid infinite loop on sample */

  3194.     sc->current_sample++;

  3195. 

  3196.     if (st->discard != AVDISCARD_ALL) {

  3197.         if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {

  3198.             av_log(mov->fc, AV_LOG_ERROR, "stream %d, offset 0x%"PRIx64": partial file\n",

  3199.                    sc->ffindex, sample->pos);

  3200.             return AVERROR_INVALIDDATA;

  3201.         }

  3202.         ret = av_get_packet(sc->pb, pkt, sample->size);

  3203.         if (ret < 0)

  3204.             return ret;

  3205.         if (sc->has_palette) {

  3206.             uint8_t *pal;

  3207. 

  3208.             pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);

  3209.             if (!pal) {

  3210.                 av_log(mov->fc, AV_LOG_ERROR, "Cannot append palette to packet\n");

  3211.             } else {

  3212.                 memcpy(pal, sc->palette, AVPALETTE_SIZE);

  3213.                 sc->has_palette = 0;

  3214.             }

  3215.         }

  3216. #if CONFIG_DV_DEMUXER

  3217.         if (mov->dv_demux && sc->dv_audio_container) {

  3218.             avpriv_dv_produce_packet(mov->dv_demux, pkt, pkt->data, pkt->size);

  3219.             av_free(pkt->data);

  3220.             pkt->size = 0;

  3221.             ret = avpriv_dv_get_packet(mov->dv_demux, pkt);

  3222.             if (ret < 0)

  3223.                 return ret;

  3224.         }

  3225. #endif

  3226.     }

  3227. 

  3228.     pkt->stream_index = sc->ffindex;

  3229.     pkt->dts = sample->timestamp;

  3230.     if (sc->ctts_data && sc->ctts_index < sc->ctts_count) {

  3231.         pkt->pts = pkt->dts + sc->dts_shift + sc->ctts_data[sc->ctts_index].duration;

  3232.         /* update ctts context */

  3233.         sc->ctts_sample++;

  3234.         if (sc->ctts_index < sc->ctts_count &&

  3235.             sc->ctts_data[sc->ctts_index].count == sc->ctts_sample) {

  3236.             sc->ctts_index++;

  3237.             sc->ctts_sample = 0;

  3238.         }

  3239.         if (sc->wrong_dts)

  3240.             pkt->dts = AV_NOPTS_VALUE;

  3241.     } else {

  3242.         int64_t next_dts = (sc->current_sample < st->nb_index_entries) ?

  3243.             st->index_entries[sc->current_sample].timestamp : st->duration;

  3244.         pkt->duration = next_dts - pkt->dts;

  3245.         pkt->pts = pkt->dts;

  3246.     }

  3247.     if (st->discard == AVDISCARD_ALL)

  3248.         goto retry;

  3249.     pkt->flags |= sample->flags & AVINDEX_KEYFRAME ? AV_PKT_FLAG_KEY : 0;

  3250.     pkt->pos = sample->pos;

  3251.     av_dlog(s, "stream %d, pts %"PRId64", dts %"PRId64", pos 0x%"PRIx64", duration %d\n",

  3252.             pkt->stream_index, pkt->pts, pkt->dts, pkt->pos, pkt->duration);

  3253.     return 0;

  3254. }

  3255. 

  3256. static int mov_seek_stream(AVFormatContext *s, AVStream *st, int64_t timestamp, int flags)

  3257. {

  3258.     MOVStreamContext *sc = st->priv_data;

  3259.     int sample, time_sample;

  3260.     int i;

  3261. 

  3262.     sample = av_index_search_timestamp(st, timestamp, flags);

  3263.     av_dlog(s, "stream %d, timestamp %"PRId64", sample %d\n", st->index, timestamp, sample);

  3264.     if (sample < 0 && st->nb_index_entries && timestamp < st->index_entries[0].timestamp)

  3265.         sample = 0;

  3266.     if (sample < 0) /* not sure what to do */

  3267.         return AVERROR_INVALIDDATA;

  3268.     sc->current_sample = sample;

  3269.     av_dlog(s, "stream %d, found sample %d\n", st->index, sc->current_sample);

  3270.     /* adjust ctts index */

  3271.     if (sc->ctts_data) {

  3272.         time_sample = 0;

  3273.         for (i = 0; i < sc->ctts_count; i++) {

  3274.             int next = time_sample + sc->ctts_data[i].count;

  3275.             if (next > sc->current_sample) {

  3276.                 sc->ctts_index = i;

  3277.                 sc->ctts_sample = sc->current_sample - time_sample;

  3278.                 break;

  3279.             }

  3280.             time_sample = next;

  3281.         }

  3282.     }

  3283.     return sample;

  3284. }

  3285. 

  3286. static int mov_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  3287. {

  3288.     AVStream *st;

  3289.     int64_t seek_timestamp, timestamp;

  3290.     int sample;

  3291.     int i;

  3292. 

  3293.     if (stream_index >= s->nb_streams)

  3294.         return AVERROR_INVALIDDATA;

  3295.     if (sample_time < 0)

  3296.         sample_time = 0;

  3297. 

  3298.     st = s->streams[stream_index];

  3299.     sample = mov_seek_stream(s, st, sample_time, flags);

  3300.     if (sample < 0)

  3301.         return sample;

  3302. 

  3303.     /* adjust seek timestamp to found sample timestamp */

  3304.     seek_timestamp = st->index_entries[sample].timestamp;

  3305. 

  3306.     for (i = 0; i < s->nb_streams; i++) {

  3307.         st = s->streams[i];

  3308.         if (stream_index == i)

  3309.             continue;

  3310. 

  3311.         timestamp = av_rescale_q(seek_timestamp, s->streams[stream_index]->time_base, st->time_base);

  3312.         mov_seek_stream(s, st, timestamp, flags);

  3313.     }

  3314.     return 0;

  3315. }

  3316. 

  3317. AVInputFormat ff_mov_demuxer = {

  3318.     .name           = "mov,mp4,m4a,3gp,3g2,mj2",

  3319.     .long_name      = NULL_IF_CONFIG_SMALL("QuickTime / MOV"),

  3320.     .priv_data_size = sizeof(MOVContext),

  3321.     .extensions     = "mov,mp4,m4a,3gp,3g2,mj2",

  3322.     .read_probe     = mov_probe,

  3323.     .read_header    = mov_read_header,

  3324.     .read_packet    = mov_read_packet,

  3325.     .read_close     = mov_read_close,

  3326.     .read_seek      = mov_read_seek,

  3327. };