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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, altitude;

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

  238. 

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

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

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

  242.         char key2[16];

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

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

  245.     }

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

  247. }

  248. 

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

  250. {

  251. #ifdef MOV_EXPORT_ALL_METADATA

  252.     char tmp_key[5];

  253. #endif

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

  255.     const char *key = NULL;

  256.     uint16_t langcode = 0;

  257.     uint32_t data_type = 0, str_size;

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

  259. 

  260.     switch (atom.type) {

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

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

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

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

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

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

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

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

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

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

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

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

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

  274.         parse = mov_metadata_gnre; break;

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

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

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

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

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

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

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

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

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

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

  285.         parse = mov_metadata_track_or_disc_number; break;

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

  287.         parse = mov_metadata_track_or_disc_number; break;

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

  289.         parse = mov_metadata_int8_bypass_padding; break;

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

  291.         parse = mov_metadata_int8_bypass_padding; break;

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

  293.         parse = mov_metadata_int8_no_padding; break;

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

  295.         parse = mov_metadata_int8_no_padding; break;

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

  297.         parse = mov_metadata_int8_no_padding; break;

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

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

  300.     }

  301. 

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

  303.         int data_size = avio_rb32(pb);

  304.         int tag = avio_rl32(pb);

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

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

  307.             avio_rb32(pb); // unknown

  308.             str_size = data_size - 16;

  309.             atom.size -= 16;

  310. 

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

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

  313.                 if (ret < 0) {

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

  315.                     return ret;

  316.                 }

  317.             }

  318.         } else return 0;

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

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

  321.         langcode = avio_rb16(pb);

  322.         ff_mov_lang_to_iso639(langcode, language);

  323.         atom.size -= 4;

  324.     } else

  325.         str_size = atom.size;

  326. 

  327. #ifdef MOV_EXPORT_ALL_METADATA

  328.     if (!key) {

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

  330.         key = tmp_key;

  331.     }

  332. #endif

  333. 

  334.     if (!key)

  335.         return 0;

  336.     if (atom.size < 0)

  337.         return AVERROR_INVALIDDATA;

  338. 

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

  340. 

  341.     if (parse)

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

  343.     else {

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

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

  346.         } else {

  347.             avio_read(pb, str, str_size);

  348.             str[str_size] = 0;

  349.         }

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

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

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

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

  354.         }

  355.     }

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

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

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

  359. 

  360.     return 0;

  361. }

  362. 

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

  364. {

  365.     int64_t start;

  366.     int i, nb_chapters, str_len, version;

  367.     char str[256+1];

  368. 

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

  370.         return 0;

  371. 

  372.     version = avio_r8(pb);

  373.     avio_rb24(pb);

  374.     if (version)

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

  376.     nb_chapters = avio_r8(pb);

  377. 

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

  379.         if (atom.size < 9)

  380.             return 0;

  381. 

  382.         start = avio_rb64(pb);

  383.         str_len = avio_r8(pb);

  384. 

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

  386.             return 0;

  387. 

  388.         avio_read(pb, str, str_len);

  389.         str[str_len] = 0;

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

  391.     }

  392.     return 0;

  393. }

  394. 

  395. #define MIN_DATA_ENTRY_BOX_SIZE 12

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

  397. {

  398.     AVStream *st;

  399.     MOVStreamContext *sc;

  400.     int entries, i, j;

  401. 

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

  403.         return 0;

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

  405.     sc = st->priv_data;

  406. 

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

  408.     entries = avio_rb32(pb);

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

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

  411.         return AVERROR_INVALIDDATA;

  412.     av_free(sc->drefs);

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

  414.     if (!sc->drefs)

  415.         return AVERROR(ENOMEM);

  416.     sc->drefs_count = entries;

  417. 

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

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

  420.         uint32_t size = avio_rb32(pb);

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

  422. 

  423.         if (size < 12)

  424.             return AVERROR_INVALIDDATA;

  425. 

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

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

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

  429. 

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

  431.             /* macintosh alias record */

  432.             uint16_t volume_len, len;

  433.             int16_t type;

  434. 

  435.             avio_skip(pb, 10);

  436. 

  437.             volume_len = avio_r8(pb);

  438.             volume_len = FFMIN(volume_len, 27);

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

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

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

  442. 

  443.             avio_skip(pb, 12);

  444. 

  445.             len = avio_r8(pb);

  446.             len = FFMIN(len, 63);

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

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

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

  450. 

  451.             avio_skip(pb, 16);

  452. 

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

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

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

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

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

  458. 

  459.             avio_skip(pb, 16);

  460. 

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

  462.                 if (pb->eof_reached)

  463.                     return AVERROR_EOF;

  464.                 type = avio_rb16(pb);

  465.                 len = avio_rb16(pb);

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

  467.                 if (len&1)

  468.                     len += 1;

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

  470.                     av_free(dref->path);

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

  472.                     if (!dref->path)

  473.                         return AVERROR(ENOMEM);

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

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

  476.                         len -= volume_len;

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

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

  479.                     }

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

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

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

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

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

  485.                     av_free(dref->dir);

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

  487.                     if (!dref->dir)

  488.                         return AVERROR(ENOMEM);

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

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

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

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

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

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

  495.                 } else

  496.                     avio_skip(pb, len);

  497.             }

  498.         }

  499.         avio_seek(pb, next, SEEK_SET);

  500.     }

  501.     return 0;

  502. }

  503. 

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

  505. {

  506.     AVStream *st;

  507.     uint32_t type;

  508.     uint32_t av_unused ctype;

  509. 

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

  511.         return 0;

  512. 

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

  514. 

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

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

  517. 

  518.     /* component type */

  519.     ctype = avio_rl32(pb);

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

  521. 

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

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

  524. 

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

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

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

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

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

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

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

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

  533. 

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

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

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

  537. 

  538.     return 0;

  539. }

  540. 

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

  542. {

  543.     AVStream *st;

  544.     int tag;

  545. 

  546.     if (fc->nb_streams < 1)

  547.         return 0;

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

  549. 

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

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

  552.     if (tag == MP4ESDescrTag) {

  553.         ff_mp4_parse_es_descr(pb, NULL);

  554.     } else

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

  556. 

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

  558.     if (tag == MP4DecConfigDescrTag)

  559.         ff_mp4_read_dec_config_descr(fc, st, pb);

  560.     return 0;

  561. }

  562. 

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

  564. {

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

  566. }

  567. 

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

  569. {

  570.     AVStream *st;

  571.     int ac3info, acmod, lfeon, bsmod;

  572. 

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

  574.         return 0;

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

  576. 

  577.     ac3info = avio_rb24(pb);

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

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

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

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

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

  583.     if (lfeon)

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

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

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

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

  588. 

  589.     return 0;

  590. }

  591. 

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

  593. {

  594.     AVStream *st;

  595.     int eac3info, acmod, lfeon, bsmod;

  596. 

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

  598.         return 0;

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

  600. 

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

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

  603.      * does not support them yet. */

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

  605.     eac3info = avio_rb24(pb);

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

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

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

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

  610.     if (lfeon)

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

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

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

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

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

  616. 

  617.     return 0;

  618. }

  619. 

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

  621. {

  622.     AVStream *st;

  623. 

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

  625.         return 0;

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

  627. 

  628.     if (atom.size < 16)

  629.         return 0;

  630. 

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

  632. 

  633.     return 0;

  634. }

  635. 

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

  637. {

  638.     AVStream *st;

  639. 

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

  641.         return 0;

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

  643. 

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

  645. 

  646.     return 0;

  647. }

  648. 

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

  650. {

  651.     const int num = avio_rb32(pb);

  652.     const int den = avio_rb32(pb);

  653.     AVStream *st;

  654. 

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

  656.         return 0;

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

  658. 

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

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

  661.         av_log(c->fc, AV_LOG_WARNING,

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

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

  664.                num, den);

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

  666.         st->sample_aspect_ratio.num = num;

  667.         st->sample_aspect_ratio.den = den;

  668.     }

  669.     return 0;

  670. }

  671. 

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

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

  674. {

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

  676.         return 0;

  677.     c->found_mdat=1;

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

  679. }

  680. 

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

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

  683. {

  684.     uint32_t minor_ver;

  685.     int comp_brand_size;

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

  687.     char* comp_brands_str;

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

  689. 

  690.     avio_read(pb, type, 4);

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

  692.         c->isom = 1;

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

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

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

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

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

  698. 

  699.     comp_brand_size = atom.size - 8;

  700.     if (comp_brand_size < 0)

  701.         return AVERROR_INVALIDDATA;

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

  703.     if (!comp_brands_str)

  704.         return AVERROR(ENOMEM);

  705.     avio_read(pb, comp_brands_str, comp_brand_size);

  706.     comp_brands_str[comp_brand_size] = 0;

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

  708.     av_freep(&comp_brands_str);

  709. 

  710.     return 0;

  711. }

  712. 

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

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

  715. {

  716.     int ret;

  717. 

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

  719.         return ret;

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

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

  722.     c->found_moov=1;

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

  724. }

  725. 

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

  727. {

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

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

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

  731. }

  732. 

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

  734. {

  735.     char buffer[32];

  736.     if (time) {

  737.         struct tm *ptm;

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

  739.         ptm = gmtime(&time);

  740.         if (!ptm) return;

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

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

  743.     }

  744. }

  745. 

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

  747. {

  748.     AVStream *st;

  749.     MOVStreamContext *sc;

  750.     int version;

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

  752.     unsigned lang;

  753.     time_t creation_time;

  754. 

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

  756.         return 0;

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

  758.     sc = st->priv_data;

  759. 

  760.     if (sc->time_scale) {

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

  762.         return AVERROR_INVALIDDATA;

  763.     }

  764. 

  765.     version = avio_r8(pb);

  766.     if (version > 1) {

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

  768.         return AVERROR_PATCHWELCOME;

  769.     }

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

  771.     if (version == 1) {

  772.         creation_time = avio_rb64(pb);

  773.         avio_rb64(pb);

  774.     } else {

  775.         creation_time = avio_rb32(pb);

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

  777.     }

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

  779. 

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

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

  782. 

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

  784.     if (ff_mov_lang_to_iso639(lang, language))

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

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

  787. 

  788.     return 0;

  789. }

  790. 

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

  792. {

  793.     time_t creation_time;

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

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

  796. 

  797.     if (version == 1) {

  798.         creation_time = avio_rb64(pb);

  799.         avio_rb64(pb);

  800.     } else {

  801.         creation_time = avio_rb32(pb);

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

  803.     }

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

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

  806. 

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

  808. 

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

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

  811. 

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

  813. 

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

  815. 

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

  817. 

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

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

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

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

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

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

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

  825. 

  826.     return 0;

  827. }

  828. 

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

  830. {

  831.     AVStream *st;

  832. 

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

  834.         return 0;

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

  836. 

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

  838.         return AVERROR_INVALIDDATA;

  839. 

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

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

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

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

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

  845.         return AVERROR(ENOMEM);

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

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

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

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

  850.     return 0;

  851. }

  852. 

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

  854. {

  855.     AVStream *st;

  856.     int little_endian;

  857. 

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

  859.         return 0;

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

  861. 

  862.     little_endian = avio_rb16(pb);

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

  864.     if (little_endian == 1) {

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

  866.         case AV_CODEC_ID_PCM_S24BE:

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

  868.             break;

  869.         case AV_CODEC_ID_PCM_S32BE:

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

  871.             break;

  872.         case AV_CODEC_ID_PCM_F32BE:

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

  874.             break;

  875.         case AV_CODEC_ID_PCM_F64BE:

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

  877.             break;

  878.         default:

  879.             break;

  880.         }

  881.     }

  882.     return 0;

  883. }

  884. 

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

  886. {

  887.     AVStream *st;

  888.     unsigned mov_field_order;

  889.     enum AVFieldOrder decoded_field_order = AV_FIELD_UNKNOWN;

  890. 

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

  892.         return 0;

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

  894.     if (atom.size < 2)

  895.         return AVERROR_INVALIDDATA;

  896.     mov_field_order = avio_rb16(pb);

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

  898.         decoded_field_order = AV_FIELD_PROGRESSIVE;

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

  900.         switch (mov_field_order & 0xFF) {

  901.         case 0x01: decoded_field_order = AV_FIELD_TT;

  902.                    break;

  903.         case 0x06: decoded_field_order = AV_FIELD_BB;

  904.                    break;

  905.         case 0x09: decoded_field_order = AV_FIELD_TB;

  906.                    break;

  907.         case 0x0E: decoded_field_order = AV_FIELD_BT;

  908.                    break;

  909.         }

  910.     }

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

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

  913.     }

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

  915. 

  916.     return 0;

  917. }

  918. 

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

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

  921. {

  922.     AVStream *st;

  923.     uint64_t size;

  924.     uint8_t *buf;

  925.     int err;

  926. 

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

  928.         return 0;

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

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

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

  932.         return AVERROR_INVALIDDATA;

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

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

  935.         return err;

  936.     }

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

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

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

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

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

  942.     return 0;

  943. }

  944. 

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

  946. {

  947.     AVStream *st;

  948. 

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

  950.         return 0;

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

  952. 

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

  954.         return AVERROR_INVALIDDATA;

  955. 

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

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

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

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

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

  961.             return AVERROR(ENOMEM);

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

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

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

  965.         int ret;

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

  967.             return ret;

  968.     } else

  969.         avio_skip(pb, atom.size);

  970.     return 0;

  971. }

  972. 

  973. /**

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

  975.  * nor size unlike mov_read_extradata.

  976.  */

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

  978. {

  979.     AVStream *st;

  980. 

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

  982.         return 0;

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

  984. 

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

  986.         return AVERROR_INVALIDDATA;

  987. 

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

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

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

  991.         unsigned size = avio_rb32(pb);

  992.         unsigned type = avio_rl32(pb);

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

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

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

  996.     }

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

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

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

  1000.         return AVERROR(ENOMEM);

  1001.     st->codec->extradata_size = atom.size;

  1002.     avio_read(pb, st->codec->extradata, atom.size);

  1003.     return 0;

  1004. }

  1005. 

  1006. static int mov_read_dvc1(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1007. {

  1008.     AVStream *st;

  1009.     uint8_t profile_level;

  1010. 

  1011.     if (c->fc->nb_streams < 1)

  1012.         return 0;

  1013.     st = c->fc->streams[c->fc->nb_streams-1];

  1014. 

  1015.     if (atom.size >= (1<<28) || atom.size < 7)

  1016.         return AVERROR_INVALIDDATA;

  1017. 

  1018.     profile_level = avio_r8(pb);

  1019.     if ((profile_level & 0xf0) != 0xc0)

  1020.         return 0;

  1021. 

  1022.     av_free(st->codec->extradata);

  1023.     st->codec->extradata = av_mallocz(atom.size - 7 + FF_INPUT_BUFFER_PADDING_SIZE);

  1024.     if (!st->codec->extradata)

  1025.         return AVERROR(ENOMEM);

  1026.     st->codec->extradata_size = atom.size - 7;

  1027.     avio_seek(pb, 6, SEEK_CUR);

  1028.     avio_read(pb, st->codec->extradata, st->codec->extradata_size);

  1029.     return 0;

  1030. }

  1031. 

  1032. /**

  1033.  * An strf atom is a BITMAPINFOHEADER struct. This struct is 40 bytes itself,

  1034.  * but can have extradata appended at the end after the 40 bytes belonging

  1035.  * to the struct.

  1036.  */

  1037. static int mov_read_strf(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1038. {

  1039.     AVStream *st;

  1040. 

  1041.     if (c->fc->nb_streams < 1)

  1042.         return 0;

  1043.     if (atom.size <= 40)

  1044.         return 0;

  1045.     st = c->fc->streams[c->fc->nb_streams-1];

  1046. 

  1047.     if ((uint64_t)atom.size > (1<<30))

  1048.         return AVERROR_INVALIDDATA;

  1049. 

  1050.     av_free(st->codec->extradata);

  1051.     st->codec->extradata = av_mallocz(atom.size - 40 + FF_INPUT_BUFFER_PADDING_SIZE);

  1052.     if (!st->codec->extradata)

  1053.         return AVERROR(ENOMEM);

  1054.     st->codec->extradata_size = atom.size - 40;

  1055.     avio_skip(pb, 40);

  1056.     avio_read(pb, st->codec->extradata, atom.size - 40);

  1057.     return 0;

  1058. }

  1059. 

  1060. static int mov_read_stco(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1061. {

  1062.     AVStream *st;

  1063.     MOVStreamContext *sc;

  1064.     unsigned int i, entries;

  1065. 

  1066.     if (c->fc->nb_streams < 1)

  1067.         return 0;

  1068.     st = c->fc->streams[c->fc->nb_streams-1];

  1069.     sc = st->priv_data;

  1070. 

  1071.     avio_r8(pb); /* version */

  1072.     avio_rb24(pb); /* flags */

  1073. 

  1074.     entries = avio_rb32(pb);

  1075. 

  1076.     if (!entries)

  1077.         return 0;

  1078.     if (entries >= UINT_MAX/sizeof(int64_t))

  1079.         return AVERROR_INVALIDDATA;

  1080. 

  1081.     sc->chunk_offsets = av_malloc(entries * sizeof(int64_t));

  1082.     if (!sc->chunk_offsets)

  1083.         return AVERROR(ENOMEM);

  1084.     sc->chunk_count = entries;

  1085. 

  1086.     if      (atom.type == MKTAG('s','t','c','o'))

  1087.         for (i = 0; i < entries && !pb->eof_reached; i++)

  1088.             sc->chunk_offsets[i] = avio_rb32(pb);

  1089.     else if (atom.type == MKTAG('c','o','6','4'))

  1090.         for (i = 0; i < entries && !pb->eof_reached; i++)

  1091.             sc->chunk_offsets[i] = avio_rb64(pb);

  1092.     else

  1093.         return AVERROR_INVALIDDATA;

  1094. 

  1095.     sc->chunk_count = i;

  1096. 

  1097.     if (pb->eof_reached)

  1098.         return AVERROR_EOF;

  1099. 

  1100.     return 0;

  1101. }

  1102. 

  1103. /**

  1104.  * Compute codec id for 'lpcm' tag.

  1105.  * See CoreAudioTypes and AudioStreamBasicDescription at Apple.

  1106.  */

  1107. enum AVCodecID ff_mov_get_lpcm_codec_id(int bps, int flags)

  1108. {

  1109.     /* lpcm flags:

  1110.      * 0x1 = float

  1111.      * 0x2 = big-endian

  1112.      * 0x4 = signed

  1113.      */

  1114.     return ff_get_pcm_codec_id(bps, flags & 1, flags & 2, flags & 4 ? -1 : 0);

  1115. }

  1116. 

  1117. static int mov_codec_id(AVStream *st, uint32_t format)

  1118. {

  1119.     int id = ff_codec_get_id(ff_codec_movaudio_tags, format);

  1120. 

  1121.     if (id <= 0 &&

  1122.         ((format & 0xFFFF) == 'm' + ('s' << 8) ||

  1123.          (format & 0xFFFF) == 'T' + ('S' << 8)))

  1124.         id = ff_codec_get_id(ff_codec_wav_tags, av_bswap32(format) & 0xFFFF);

  1125. 

  1126.     if (st->codec->codec_type != AVMEDIA_TYPE_VIDEO && id > 0) {

  1127.         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

  1128.     } else if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO &&

  1129.                /* skip old asf mpeg4 tag */

  1130.                format && format != MKTAG('m','p','4','s')) {

  1131.         id = ff_codec_get_id(ff_codec_movvideo_tags, format);

  1132.         if (id <= 0)

  1133.             id = ff_codec_get_id(ff_codec_bmp_tags, format);

  1134.         if (id > 0)

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

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

  1137.             id = ff_codec_get_id(ff_codec_movsubtitle_tags, format);

  1138.             if (id > 0)

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

  1140.         }

  1141.     }

  1142. 

  1143.     st->codec->codec_tag = format;

  1144. 

  1145.     return id;

  1146. }

  1147. 

  1148. static void mov_parse_stsd_video(MOVContext *c, AVIOContext *pb,

  1149.                                  AVStream *st, MOVStreamContext *sc)

  1150. {

  1151.     uint8_t codec_name[32];

  1152.     unsigned int color_depth, len, j;

  1153.     int color_greyscale;

  1154.     int color_table_id;

  1155. 

  1156.     avio_rb16(pb); /* version */

  1157.     avio_rb16(pb); /* revision level */

  1158.     avio_rb32(pb); /* vendor */

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

  1160.     avio_rb32(pb); /* spatial quality */

  1161. 

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

  1163.     st->codec->height = avio_rb16(pb); /* height */

  1164. 

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

  1166.     avio_rb32(pb); /* vert resolution */

  1167.     avio_rb32(pb); /* data size, always 0 */

  1168.     avio_rb16(pb); /* frames per samples */

  1169. 

  1170.     len = avio_r8(pb); /* codec name, pascal string */

  1171.     if (len > 31)

  1172.         len = 31;

  1173.     mov_read_mac_string(c, pb, len, codec_name, sizeof(codec_name));

  1174.     if (len < 31)

  1175.         avio_skip(pb, 31 - len);

  1176. 

  1177.     if (codec_name[0])

  1178.         av_dict_set(&st->metadata, "encoder", codec_name, 0);

  1179. 

  1180.     /* codec_tag YV12 triggers an UV swap in rawdec.c */

  1181.     if (!memcmp(codec_name, "Planar Y'CbCr 8-bit 4:2:0", 25))

  1182.         st->codec->codec_tag = MKTAG('I', '4', '2', '0');

  1183.     /* Flash Media Server uses tag H263 with Sorenson Spark */

  1184.     if (st->codec->codec_tag == MKTAG('H','2','6','3') &&

  1185.         !memcmp(codec_name, "Sorenson H263", 13))

  1186.         st->codec->codec_id = AV_CODEC_ID_FLV1;

  1187. 

  1188.     st->codec->bits_per_coded_sample = avio_rb16(pb); /* depth */

  1189.     color_table_id = avio_rb16(pb); /* colortable id */

  1190.     av_dlog(c->fc, "depth %d, ctab id %d\n",

  1191.             st->codec->bits_per_coded_sample, color_table_id);

  1192.     /* figure out the palette situation */

  1193.     color_depth     = st->codec->bits_per_coded_sample & 0x1F;

  1194.     color_greyscale = st->codec->bits_per_coded_sample & 0x20;

  1195. 

  1196.     /* if the depth is 2, 4, or 8 bpp, file is palettized */

  1197.     if ((color_depth == 2) || (color_depth == 4) || (color_depth == 8)) {

  1198.         /* for palette traversal */

  1199.         unsigned int color_start, color_count, color_end;

  1200.         unsigned char r, g, b;

  1201. 

  1202.         if (color_greyscale) {

  1203.             int color_index, color_dec;

  1204.             /* compute the greyscale palette */

  1205.             st->codec->bits_per_coded_sample = color_depth;

  1206.             color_count = 1 << color_depth;

  1207.             color_index = 255;

  1208.             color_dec   = 256 / (color_count - 1);

  1209.             for (j = 0; j < color_count; j++) {

  1210.                 r = g = b = color_index;

  1211.                 sc->palette[j] = (r << 16) | (g << 8) | (b);

  1212.                 color_index -= color_dec;

  1213.                 if (color_index < 0)

  1214.                     color_index = 0;

  1215.             }

  1216.         } else if (color_table_id) {

  1217.             const uint8_t *color_table;

  1218.             /* if flag bit 3 is set, use the default palette */

  1219.             color_count = 1 << color_depth;

  1220.             if (color_depth == 2)

  1221.                 color_table = ff_qt_default_palette_4;

  1222.             else if (color_depth == 4)

  1223.                 color_table = ff_qt_default_palette_16;

  1224.             else

  1225.                 color_table = ff_qt_default_palette_256;

  1226. 

  1227.             for (j = 0; j < color_count; j++) {

  1228.                 r = color_table[j * 3 + 0];

  1229.                 g = color_table[j * 3 + 1];

  1230.                 b = color_table[j * 3 + 2];

  1231.                 sc->palette[j] = (r << 16) | (g << 8) | (b);

  1232.             }

  1233.         } else {

  1234.             /* load the palette from the file */

  1235.             color_start = avio_rb32(pb);

  1236.             color_count = avio_rb16(pb);

  1237.             color_end   = avio_rb16(pb);

  1238.             if ((color_start <= 255) && (color_end <= 255)) {

  1239.                 for (j = color_start; j <= color_end; j++) {

  1240.                     /* each R, G, or B component is 16 bits;

  1241.                      * only use the top 8 bits; skip alpha bytes

  1242.                      * up front */

  1243.                     avio_r8(pb);

  1244.                     avio_r8(pb);

  1245.                     r = avio_r8(pb);

  1246.                     avio_r8(pb);

  1247.                     g = avio_r8(pb);

  1248.                     avio_r8(pb);

  1249.                     b = avio_r8(pb);

  1250.                     avio_r8(pb);

  1251.                     sc->palette[j] = (r << 16) | (g << 8) | (b);

  1252.                 }

  1253.             }

  1254.         }

  1255.         sc->has_palette = 1;

  1256.     }

  1257. }

  1258. 

  1259. static void mov_parse_stsd_audio(MOVContext *c, AVIOContext *pb,

  1260.                                  AVStream *st, MOVStreamContext *sc)

  1261. {

  1262.     int bits_per_sample, flags;

  1263.     uint16_t version = avio_rb16(pb);

  1264. 

  1265.     avio_rb16(pb); /* revision level */

  1266.     avio_rb32(pb); /* vendor */

  1267. 

  1268.     st->codec->channels              = avio_rb16(pb); /* channel count */

  1269.     st->codec->bits_per_coded_sample = avio_rb16(pb); /* sample size */

  1270.     av_dlog(c->fc, "audio channels %d\n", st->codec->channels);

  1271. 

  1272.     sc->audio_cid = avio_rb16(pb);

  1273.     avio_rb16(pb); /* packet size = 0 */

  1274. 

  1275.     st->codec->sample_rate = ((avio_rb32(pb) >> 16));

  1276. 

  1277.     // Read QT version 1 fields. In version 0 these do not exist.

  1278.     av_dlog(c->fc, "version =%d, isom =%d\n", version, c->isom);

  1279.     if (!c->isom) {

  1280.         if (version == 1) {

  1281.             sc->samples_per_frame = avio_rb32(pb);

  1282.             avio_rb32(pb); /* bytes per packet */

  1283.             sc->bytes_per_frame = avio_rb32(pb);

  1284.             avio_rb32(pb); /* bytes per sample */

  1285.         } else if (version == 2) {

  1286.             avio_rb32(pb); /* sizeof struct only */

  1287.             st->codec->sample_rate = av_int2double(avio_rb64(pb));

  1288.             st->codec->channels    = avio_rb32(pb);

  1289.             avio_rb32(pb); /* always 0x7F000000 */

  1290.             st->codec->bits_per_coded_sample = avio_rb32(pb);

  1291. 

  1292.             flags = avio_rb32(pb); /* lpcm format specific flag */

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

  1294.             sc->samples_per_frame = avio_rb32(pb);

  1295.             if (st->codec->codec_tag == MKTAG('l','p','c','m'))

  1296.                 st->codec->codec_id =

  1297.                     ff_mov_get_lpcm_codec_id(st->codec->bits_per_coded_sample,

  1298.                                              flags);

  1299.         }

  1300.     }

  1301. 

  1302.     switch (st->codec->codec_id) {

  1303.     case AV_CODEC_ID_PCM_S8:

  1304.     case AV_CODEC_ID_PCM_U8:

  1305.         if (st->codec->bits_per_coded_sample == 16)

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

  1307.         break;

  1308.     case AV_CODEC_ID_PCM_S16LE:

  1309.     case AV_CODEC_ID_PCM_S16BE:

  1310.         if (st->codec->bits_per_coded_sample == 8)

  1311.             st->codec->codec_id = AV_CODEC_ID_PCM_S8;

  1312.         else if (st->codec->bits_per_coded_sample == 24)

  1313.             st->codec->codec_id =

  1314.                 st->codec->codec_id == AV_CODEC_ID_PCM_S16BE ?

  1315.                 AV_CODEC_ID_PCM_S24BE : AV_CODEC_ID_PCM_S24LE;

  1316.         break;

  1317.     /* set values for old format before stsd version 1 appeared */

  1318.     case AV_CODEC_ID_MACE3:

  1319.         sc->samples_per_frame = 6;

  1320.         sc->bytes_per_frame   = 2 * st->codec->channels;

  1321.         break;

  1322.     case AV_CODEC_ID_MACE6:

  1323.         sc->samples_per_frame = 6;

  1324.         sc->bytes_per_frame   = 1 * st->codec->channels;

  1325.         break;

  1326.     case AV_CODEC_ID_ADPCM_IMA_QT:

  1327.         sc->samples_per_frame = 64;

  1328.         sc->bytes_per_frame   = 34 * st->codec->channels;

  1329.         break;

  1330.     case AV_CODEC_ID_GSM:

  1331.         sc->samples_per_frame = 160;

  1332.         sc->bytes_per_frame   = 33;

  1333.         break;

  1334.     default:

  1335.         break;

  1336.     }

  1337. 

  1338.     bits_per_sample = av_get_bits_per_sample(st->codec->codec_id);

  1339.     if (bits_per_sample) {

  1340.         st->codec->bits_per_coded_sample = bits_per_sample;

  1341.         sc->sample_size = (bits_per_sample >> 3) * st->codec->channels;

  1342.     }

  1343. }

  1344. 

  1345. static void mov_parse_stsd_subtitle(MOVContext *c, AVIOContext *pb,

  1346.                                     AVStream *st, MOVStreamContext *sc,

  1347.                                     int size)

  1348. {

  1349.     // ttxt stsd contains display flags, justification, background

  1350.     // color, fonts, and default styles, so fake an atom to read it

  1351.     MOVAtom fake_atom = { .size = size };

  1352.     // mp4s contains a regular esds atom

  1353.     if (st->codec->codec_tag != AV_RL32("mp4s"))

  1354.         mov_read_glbl(c, pb, fake_atom);

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

  1356.     st->codec->height = sc->height;

  1357. }

  1358. 

  1359. static uint32_t yuv_to_rgba(uint32_t ycbcr)

  1360. {

  1361.     uint8_t r, g, b;

  1362.     int y, cb, cr;

  1363. 

  1364.     y  = (ycbcr >> 16) & 0xFF;

  1365.     cr = (ycbcr >> 8)  & 0xFF;

  1366.     cb =  ycbcr        & 0xFF;

  1367. 

  1368.     b = av_clip_uint8(1.164 * (y - 16)                      + 2.018 * (cb - 128));

  1369.     g = av_clip_uint8(1.164 * (y - 16) - 0.813 * (cr - 128) - 0.391 * (cb - 128));

  1370.     r = av_clip_uint8(1.164 * (y - 16) + 1.596 * (cr - 128));

  1371. 

  1372.     return (r << 16) | (g << 8) | b;

  1373. }

  1374. 

  1375. static int mov_rewrite_dvd_sub_extradata(AVStream *st)

  1376. {

  1377.     char buf[256] = {0};

  1378.     uint8_t *src = st->codec->extradata;

  1379.     int i;

  1380. 

  1381.     if (st->codec->extradata_size != 64)

  1382.         return 0;

  1383. 

  1384.     if (st->codec->width > 0 &&  st->codec->height > 0)

  1385.         snprintf(buf, sizeof(buf), "size: %dx%d\n",

  1386.                  st->codec->width, st->codec->height);

  1387.     av_strlcat(buf, "palette: ", sizeof(buf));

  1388. 

  1389.     for (i = 0; i < 16; i++) {

  1390.         uint32_t yuv = AV_RB32(src + i * 4);

  1391.         uint32_t rgba = yuv_to_rgba(yuv);

  1392. 

  1393.         av_strlcatf(buf, sizeof(buf), "%06"PRIx32"%s", rgba, i != 15 ? ", " : "");

  1394.     }

  1395. 

  1396.     if (av_strlcat(buf, "\n", sizeof(buf)) >= sizeof(buf))

  1397.         return 0;

  1398. 

  1399.     av_freep(&st->codec->extradata);

  1400.     st->codec->extradata_size = 0;

  1401.     st->codec->extradata = av_mallocz(strlen(buf) + FF_INPUT_BUFFER_PADDING_SIZE);

  1402.     if (!st->codec->extradata)

  1403.         return AVERROR(ENOMEM);

  1404.     st->codec->extradata_size = strlen(buf);

  1405.     memcpy(st->codec->extradata, buf, st->codec->extradata_size);

  1406. 

  1407.     return 0;

  1408. }

  1409. 

  1410. static int mov_parse_stsd_data(MOVContext *c, AVIOContext *pb,

  1411.                                 AVStream *st, MOVStreamContext *sc,

  1412.                                 int size)

  1413. {

  1414.     if (st->codec->codec_tag == MKTAG('t','m','c','d')) {

  1415.         st->codec->extradata_size = size;

  1416.         st->codec->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);

  1417.         if (!st->codec->extradata)

  1418.             return AVERROR(ENOMEM);

  1419.         avio_read(pb, st->codec->extradata, size);

  1420.     } else {

  1421.         /* other codec type, just skip (rtp, mp4s ...) */

  1422.         avio_skip(pb, size);

  1423.     }

  1424.     return 0;

  1425. }

  1426. 

  1427. static int mov_finalize_stsd_codec(MOVContext *c, AVIOContext *pb,

  1428.                                    AVStream *st, MOVStreamContext *sc)

  1429. {

  1430.     if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&

  1431.         !st->codec->sample_rate && sc->time_scale > 1)

  1432.         st->codec->sample_rate = sc->time_scale;

  1433. 

  1434.     /* special codec parameters handling */

  1435.     switch (st->codec->codec_id) {

  1436. #if CONFIG_DV_DEMUXER

  1437.     case AV_CODEC_ID_DVAUDIO:

  1438.         c->dv_fctx  = avformat_alloc_context();

  1439.         c->dv_demux = avpriv_dv_init_demux(c->dv_fctx);

  1440.         if (!c->dv_demux) {

  1441.             av_log(c->fc, AV_LOG_ERROR, "dv demux context init error\n");

  1442.             return AVERROR(ENOMEM);

  1443.         }

  1444.         sc->dv_audio_container = 1;

  1445.         st->codec->codec_id    = AV_CODEC_ID_PCM_S16LE;

  1446.         break;

  1447. #endif

  1448.     /* no ifdef since parameters are always those */

  1449.     case AV_CODEC_ID_QCELP:

  1450.         st->codec->channels = 1;

  1451.         // force sample rate for qcelp when not stored in mov

  1452.         if (st->codec->codec_tag != MKTAG('Q','c','l','p'))

  1453.             st->codec->sample_rate = 8000;

  1454.         break;

  1455.     case AV_CODEC_ID_AMR_NB:

  1456.         st->codec->channels    = 1;

  1457.         /* force sample rate for amr, stsd in 3gp does not store sample rate */

  1458.         st->codec->sample_rate = 8000;

  1459.         break;

  1460.     case AV_CODEC_ID_AMR_WB:

  1461.         st->codec->channels    = 1;

  1462.         st->codec->sample_rate = 16000;

  1463.         break;

  1464.     case AV_CODEC_ID_MP2:

  1465.     case AV_CODEC_ID_MP3:

  1466.         /* force type after stsd for m1a hdlr */

  1467.         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

  1468.         st->need_parsing      = AVSTREAM_PARSE_FULL;

  1469.         break;

  1470.     case AV_CODEC_ID_GSM:

  1471.     case AV_CODEC_ID_ADPCM_MS:

  1472.     case AV_CODEC_ID_ADPCM_IMA_WAV:

  1473.     case AV_CODEC_ID_ILBC:

  1474.         st->codec->block_align = sc->bytes_per_frame;

  1475.         break;

  1476.     case AV_CODEC_ID_ALAC:

  1477.         if (st->codec->extradata_size == 36) {

  1478.             st->codec->channels    = AV_RB8 (st->codec->extradata + 21);

  1479.             st->codec->sample_rate = AV_RB32(st->codec->extradata + 32);

  1480.         }

  1481.         break;

  1482.     case AV_CODEC_ID_VC1:

  1483.         st->need_parsing = AVSTREAM_PARSE_FULL;

  1484.         break;

  1485.     default:

  1486.         break;

  1487.     }

  1488.     return 0;

  1489. }

  1490. 

  1491. static int mov_skip_multiple_stsd(MOVContext *c, AVIOContext *pb,

  1492.                                   int codec_tag, int format,

  1493.                                   int size)

  1494. {

  1495.     int video_codec_id = ff_codec_get_id(ff_codec_movvideo_tags, format);

  1496. 

  1497.     if (codec_tag &&

  1498.         (codec_tag == AV_RL32("avc1") ||

  1499.          codec_tag == AV_RL32("hvc1") ||

  1500.          codec_tag == AV_RL32("hev1") ||

  1501.          (codec_tag != format &&

  1502.           (c->fc->video_codec_id ? video_codec_id != c->fc->video_codec_id

  1503.                                  : codec_tag != MKTAG('j','p','e','g'))))) {

  1504.         /* Multiple fourcc, we skip JPEG. This is not correct, we should

  1505.          * export it as a separate AVStream but this needs a few changes

  1506.          * in the MOV demuxer, patch welcome. */

  1507. 

  1508.         av_log(c->fc, AV_LOG_WARNING, "multiple fourcc not supported\n");

  1509.         avio_skip(pb, size);

  1510.         return 1;

  1511.     }

  1512. 

  1513.     return 0;

  1514. }

  1515. 

  1516. int ff_mov_read_stsd_entries(MOVContext *c, AVIOContext *pb, int entries)

  1517. {

  1518.     AVStream *st;

  1519.     MOVStreamContext *sc;

  1520.     int pseudo_stream_id;

  1521. 

  1522.     if (c->fc->nb_streams < 1)

  1523.         return 0;

  1524.     st = c->fc->streams[c->fc->nb_streams-1];

  1525.     sc = st->priv_data;

  1526. 

  1527.     for (pseudo_stream_id = 0;

  1528.          pseudo_stream_id < entries && !pb->eof_reached;

  1529.          pseudo_stream_id++) {

  1530.         //Parsing Sample description table

  1531.         enum AVCodecID id;

  1532.         int ret, dref_id = 1;

  1533.         MOVAtom a = { AV_RL32("stsd") };

  1534.         int64_t start_pos = avio_tell(pb);

  1535.         uint32_t size = avio_rb32(pb); /* size */

  1536.         uint32_t format = avio_rl32(pb); /* data format */

  1537. 

  1538.         if (size >= 16) {

  1539.             avio_rb32(pb); /* reserved */

  1540.             avio_rb16(pb); /* reserved */

  1541.             dref_id = avio_rb16(pb);

  1542.         } else {

  1543.             av_log(c->fc, AV_LOG_ERROR, "invalid size %"PRIu32" in stsd\n", size);

  1544.             return AVERROR_INVALIDDATA;

  1545.         }

  1546. 

  1547.         if (mov_skip_multiple_stsd(c, pb, st->codec->codec_tag, format,

  1548.                                    size - (avio_tell(pb) - start_pos)))

  1549.             continue;

  1550. 

  1551.         sc->pseudo_stream_id = st->codec->codec_tag ? -1 : pseudo_stream_id;

  1552.         sc->dref_id= dref_id;

  1553. 

  1554.         id = mov_codec_id(st, format);

  1555. 

  1556.         av_dlog(c->fc, "size=%"PRIu32" 4CC= %"PRIu8"%"PRIu8"%"PRIu8"%"PRIu8" codec_type=%d\n", size,

  1557.                 (format >> 0) & 0xff, (format >> 8) & 0xff, (format >> 16) & 0xff,

  1558.                 (format >> 24) & 0xff, st->codec->codec_type);

  1559. 

  1560.         if (st->codec->codec_type==AVMEDIA_TYPE_VIDEO) {

  1561.             st->codec->codec_id = id;

  1562.             mov_parse_stsd_video(c, pb, st, sc);

  1563.         } else if (st->codec->codec_type==AVMEDIA_TYPE_AUDIO) {

  1564.             st->codec->codec_id = id;

  1565.             mov_parse_stsd_audio(c, pb, st, sc);

  1566.         } else if (st->codec->codec_type==AVMEDIA_TYPE_SUBTITLE){

  1567.             st->codec->codec_id = id;

  1568.             mov_parse_stsd_subtitle(c, pb, st, sc,

  1569.                                     size - (avio_tell(pb) - start_pos));

  1570.         } else {

  1571.             ret = mov_parse_stsd_data(c, pb, st, sc,

  1572.                                       size - (avio_tell(pb) - start_pos));

  1573.             if (ret < 0)

  1574.                 return ret;

  1575.         }

  1576.         /* this will read extra atoms at the end (wave, alac, damr, avcC, hvcC, SMI ...) */

  1577.         a.size = size - (avio_tell(pb) - start_pos);

  1578.         if (a.size > 8) {

  1579.             if ((ret = mov_read_default(c, pb, a)) < 0)

  1580.                 return ret;

  1581.         } else if (a.size > 0)

  1582.             avio_skip(pb, a.size);

  1583.     }

  1584. 

  1585.     if (pb->eof_reached)

  1586.         return AVERROR_EOF;

  1587. 

  1588.     return mov_finalize_stsd_codec(c, pb, st, sc);

  1589. }

  1590. 

  1591. static int mov_read_stsd(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1592. {

  1593.     int entries;

  1594. 

  1595.     avio_r8(pb); /* version */

  1596.     avio_rb24(pb); /* flags */

  1597.     entries = avio_rb32(pb);

  1598. 

  1599.     return ff_mov_read_stsd_entries(c, pb, entries);

  1600. }

  1601. 

  1602. static int mov_read_stsc(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1603. {

  1604.     AVStream *st;

  1605.     MOVStreamContext *sc;

  1606.     unsigned int i, entries;

  1607. 

  1608.     if (c->fc->nb_streams < 1)

  1609.         return 0;

  1610.     st = c->fc->streams[c->fc->nb_streams-1];

  1611.     sc = st->priv_data;

  1612. 

  1613.     avio_r8(pb); /* version */

  1614.     avio_rb24(pb); /* flags */

  1615. 

  1616.     entries = avio_rb32(pb);

  1617. 

  1618.     av_dlog(c->fc, "track[%i].stsc.entries = %i\n", c->fc->nb_streams-1, entries);

  1619. 

  1620.     if (!entries)

  1621.         return 0;

  1622.     if (entries >= UINT_MAX / sizeof(*sc->stsc_data))

  1623.         return AVERROR_INVALIDDATA;

  1624.     sc->stsc_data = av_malloc(entries * sizeof(*sc->stsc_data));

  1625.     if (!sc->stsc_data)

  1626.         return AVERROR(ENOMEM);

  1627. 

  1628.     for (i = 0; i < entries && !pb->eof_reached; i++) {

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

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

  1631.         sc->stsc_data[i].id = avio_rb32(pb);

  1632.     }

  1633. 

  1634.     sc->stsc_count = i;

  1635. 

  1636.     if (pb->eof_reached)

  1637.         return AVERROR_EOF;

  1638. 

  1639.     return 0;

  1640. }

  1641. 

  1642. static int mov_read_stps(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1643. {

  1644.     AVStream *st;

  1645.     MOVStreamContext *sc;

  1646.     unsigned i, entries;

  1647. 

  1648.     if (c->fc->nb_streams < 1)

  1649.         return 0;

  1650.     st = c->fc->streams[c->fc->nb_streams-1];

  1651.     sc = st->priv_data;

  1652. 

  1653.     avio_rb32(pb); // version + flags

  1654. 

  1655.     entries = avio_rb32(pb);

  1656.     if (entries >= UINT_MAX / sizeof(*sc->stps_data))

  1657.         return AVERROR_INVALIDDATA;

  1658.     sc->stps_data = av_malloc(entries * sizeof(*sc->stps_data));

  1659.     if (!sc->stps_data)

  1660.         return AVERROR(ENOMEM);

  1661. 

  1662.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1663.         sc->stps_data[i] = avio_rb32(pb);

  1664.         //av_dlog(c->fc, "stps %d\n", sc->stps_data[i]);

  1665.     }

  1666. 

  1667.     sc->stps_count = i;

  1668. 

  1669.     if (pb->eof_reached)

  1670.         return AVERROR_EOF;

  1671. 

  1672.     return 0;

  1673. }

  1674. 

  1675. static int mov_read_stss(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1676. {

  1677.     AVStream *st;

  1678.     MOVStreamContext *sc;

  1679.     unsigned int i, entries;

  1680. 

  1681.     if (c->fc->nb_streams < 1)

  1682.         return 0;

  1683.     st = c->fc->streams[c->fc->nb_streams-1];

  1684.     sc = st->priv_data;

  1685. 

  1686.     avio_r8(pb); /* version */

  1687.     avio_rb24(pb); /* flags */

  1688. 

  1689.     entries = avio_rb32(pb);

  1690. 

  1691.     av_dlog(c->fc, "keyframe_count = %d\n", entries);

  1692. 

  1693.     if (!entries)

  1694.     {

  1695.         sc->keyframe_absent = 1;

  1696.         return 0;

  1697.     }

  1698.     if (entries >= UINT_MAX / sizeof(int))

  1699.         return AVERROR_INVALIDDATA;

  1700.     sc->keyframes = av_malloc(entries * sizeof(int));

  1701.     if (!sc->keyframes)

  1702.         return AVERROR(ENOMEM);

  1703. 

  1704.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1705.         sc->keyframes[i] = avio_rb32(pb);

  1706.         //av_dlog(c->fc, "keyframes[]=%d\n", sc->keyframes[i]);

  1707.     }

  1708. 

  1709.     sc->keyframe_count = i;

  1710. 

  1711.     if (pb->eof_reached)

  1712.         return AVERROR_EOF;

  1713. 

  1714.     return 0;

  1715. }

  1716. 

  1717. static int mov_read_stsz(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1718. {

  1719.     AVStream *st;

  1720.     MOVStreamContext *sc;

  1721.     unsigned int i, entries, sample_size, field_size, num_bytes;

  1722.     GetBitContext gb;

  1723.     unsigned char* buf;

  1724. 

  1725.     if (c->fc->nb_streams < 1)

  1726.         return 0;

  1727.     st = c->fc->streams[c->fc->nb_streams-1];

  1728.     sc = st->priv_data;

  1729. 

  1730.     avio_r8(pb); /* version */

  1731.     avio_rb24(pb); /* flags */

  1732. 

  1733.     if (atom.type == MKTAG('s','t','s','z')) {

  1734.         sample_size = avio_rb32(pb);

  1735.         if (!sc->sample_size) /* do not overwrite value computed in stsd */

  1736.             sc->sample_size = sample_size;

  1737.         field_size = 32;

  1738.     } else {

  1739.         sample_size = 0;

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

  1741.         field_size = avio_r8(pb);

  1742.     }

  1743.     entries = avio_rb32(pb);

  1744. 

  1745.     av_dlog(c->fc, "sample_size = %d sample_count = %d\n", sc->sample_size, entries);

  1746. 

  1747.     sc->sample_count = entries;

  1748.     if (sample_size)

  1749.         return 0;

  1750. 

  1751.     if (field_size != 4 && field_size != 8 && field_size != 16 && field_size != 32) {

  1752.         av_log(c->fc, AV_LOG_ERROR, "Invalid sample field size %d\n", field_size);

  1753.         return AVERROR_INVALIDDATA;

  1754.     }

  1755. 

  1756.     if (!entries)

  1757.         return 0;

  1758.     if (entries >= UINT_MAX / sizeof(int) || entries >= (UINT_MAX - 4) / field_size)

  1759.         return AVERROR_INVALIDDATA;

  1760.     sc->sample_sizes = av_malloc(entries * sizeof(int));

  1761.     if (!sc->sample_sizes)

  1762.         return AVERROR(ENOMEM);

  1763. 

  1764.     num_bytes = (entries*field_size+4)>>3;

  1765. 

  1766.     buf = av_malloc(num_bytes+FF_INPUT_BUFFER_PADDING_SIZE);

  1767.     if (!buf) {

  1768.         av_freep(&sc->sample_sizes);

  1769.         return AVERROR(ENOMEM);

  1770.     }

  1771. 

  1772.     if (avio_read(pb, buf, num_bytes) < num_bytes) {

  1773.         av_freep(&sc->sample_sizes);

  1774.         av_free(buf);

  1775.         return AVERROR_INVALIDDATA;

  1776.     }

  1777. 

  1778.     init_get_bits(&gb, buf, 8*num_bytes);

  1779. 

  1780.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1781.         sc->sample_sizes[i] = get_bits_long(&gb, field_size);

  1782.         sc->data_size += sc->sample_sizes[i];

  1783.     }

  1784. 

  1785.     sc->sample_count = i;

  1786. 

  1787.     if (pb->eof_reached)

  1788.         return AVERROR_EOF;

  1789. 

  1790.     av_free(buf);

  1791.     return 0;

  1792. }

  1793. 

  1794. static int mov_read_stts(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1795. {

  1796.     AVStream *st;

  1797.     MOVStreamContext *sc;

  1798.     unsigned int i, entries;

  1799.     int64_t duration=0;

  1800.     int64_t total_sample_count=0;

  1801. 

  1802.     if (c->fc->nb_streams < 1)

  1803.         return 0;

  1804.     st = c->fc->streams[c->fc->nb_streams-1];

  1805.     sc = st->priv_data;

  1806. 

  1807.     avio_r8(pb); /* version */

  1808.     avio_rb24(pb); /* flags */

  1809.     entries = avio_rb32(pb);

  1810. 

  1811.     av_dlog(c->fc, "track[%i].stts.entries = %i\n",

  1812.             c->fc->nb_streams-1, entries);

  1813. 

  1814.     if (!entries)

  1815.         return 0;

  1816.     if (entries >= UINT_MAX / sizeof(*sc->stts_data))

  1817.         return AVERROR(EINVAL);

  1818. 

  1819.     av_free(sc->stts_data);

  1820.     sc->stts_data = av_malloc(entries * sizeof(*sc->stts_data));

  1821.     if (!sc->stts_data)

  1822.         return AVERROR(ENOMEM);

  1823. 

  1824.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1825.         int sample_duration;

  1826.         int sample_count;

  1827. 

  1828.         sample_count=avio_rb32(pb);

  1829.         sample_duration = avio_rb32(pb);

  1830.         if (sample_count < 0) {

  1831.             av_log(c->fc, AV_LOG_ERROR, "Invalid sample_count=%d\n", sample_count);

  1832.             return AVERROR_INVALIDDATA;

  1833.         }

  1834.         sc->stts_data[i].count= sample_count;

  1835.         sc->stts_data[i].duration= sample_duration;

  1836. 

  1837.         av_dlog(c->fc, "sample_count=%d, sample_duration=%d\n",

  1838.                 sample_count, sample_duration);

  1839. 

  1840.         duration+=(int64_t)sample_duration*sample_count;

  1841.         total_sample_count+=sample_count;

  1842.     }

  1843. 

  1844.     sc->stts_count = i;

  1845. 

  1846.     if (pb->eof_reached)

  1847.         return AVERROR_EOF;

  1848. 

  1849.     st->nb_frames= total_sample_count;

  1850.     if (duration)

  1851.         st->duration= duration;

  1852.     sc->track_end = duration;

  1853.     return 0;

  1854. }

  1855. 

  1856. static int mov_read_ctts(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1857. {

  1858.     AVStream *st;

  1859.     MOVStreamContext *sc;

  1860.     unsigned int i, entries;

  1861. 

  1862.     if (c->fc->nb_streams < 1)

  1863.         return 0;

  1864.     st = c->fc->streams[c->fc->nb_streams-1];

  1865.     sc = st->priv_data;

  1866. 

  1867.     avio_r8(pb); /* version */

  1868.     avio_rb24(pb); /* flags */

  1869.     entries = avio_rb32(pb);

  1870. 

  1871.     av_dlog(c->fc, "track[%i].ctts.entries = %i\n", c->fc->nb_streams-1, entries);

  1872. 

  1873.     if (!entries)

  1874.         return 0;

  1875.     if (entries >= UINT_MAX / sizeof(*sc->ctts_data))

  1876.         return AVERROR_INVALIDDATA;

  1877.     sc->ctts_data = av_malloc(entries * sizeof(*sc->ctts_data));

  1878.     if (!sc->ctts_data)

  1879.         return AVERROR(ENOMEM);

  1880. 

  1881.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1882.         int count    =avio_rb32(pb);

  1883.         int duration =avio_rb32(pb);

  1884. 

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

  1886.         sc->ctts_data[i].duration= duration;

  1887.         if (duration < 0)

  1888.             sc->dts_shift = FFMAX(sc->dts_shift, -duration);

  1889.     }

  1890. 

  1891.     sc->ctts_count = i;

  1892. 

  1893.     if (pb->eof_reached)

  1894.         return AVERROR_EOF;

  1895. 

  1896.     av_dlog(c->fc, "dts shift %d\n", sc->dts_shift);

  1897. 

  1898.     return 0;

  1899. }

  1900. 

  1901. static int mov_read_sbgp(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1902. {

  1903.     AVStream *st;

  1904.     MOVStreamContext *sc;

  1905.     unsigned int i, entries;

  1906.     uint8_t version;

  1907.     uint32_t grouping_type;

  1908. 

  1909.     if (c->fc->nb_streams < 1)

  1910.         return 0;

  1911.     st = c->fc->streams[c->fc->nb_streams-1];

  1912.     sc = st->priv_data;

  1913. 

  1914.     version = avio_r8(pb); /* version */

  1915.     avio_rb24(pb); /* flags */

  1916.     grouping_type = avio_rl32(pb);

  1917.     if (grouping_type != MKTAG( 'r','a','p',' '))

  1918.         return 0; /* only support 'rap ' grouping */

  1919.     if (version == 1)

  1920.         avio_rb32(pb); /* grouping_type_parameter */

  1921. 

  1922.     entries = avio_rb32(pb);

  1923.     if (!entries)

  1924.         return 0;

  1925.     if (entries >= UINT_MAX / sizeof(*sc->rap_group))

  1926.         return AVERROR_INVALIDDATA;

  1927.     sc->rap_group = av_malloc(entries * sizeof(*sc->rap_group));

  1928.     if (!sc->rap_group)

  1929.         return AVERROR(ENOMEM);

  1930. 

  1931.     for (i = 0; i < entries && !pb->eof_reached; i++) {

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

  1933.         sc->rap_group[i].index = avio_rb32(pb); /* group_description_index */

  1934.     }

  1935. 

  1936.     sc->rap_group_count = i;

  1937. 

  1938.     return pb->eof_reached ? AVERROR_EOF : 0;

  1939. }

  1940. 

  1941. static void mov_build_index(MOVContext *mov, AVStream *st)

  1942. {

  1943.     MOVStreamContext *sc = st->priv_data;

  1944.     int64_t current_offset;

  1945.     int64_t current_dts = 0;

  1946.     unsigned int stts_index = 0;

  1947.     unsigned int stsc_index = 0;

  1948.     unsigned int stss_index = 0;

  1949.     unsigned int stps_index = 0;

  1950.     unsigned int i, j;

  1951.     uint64_t stream_size = 0;

  1952. 

  1953.     /* adjust first dts according to edit list */

  1954.     if (sc->time_offset && mov->time_scale > 0) {

  1955.         if (sc->time_offset < 0)

  1956.             sc->time_offset = av_rescale(sc->time_offset, sc->time_scale, mov->time_scale);

  1957.         current_dts = -sc->time_offset;

  1958.         if (sc->ctts_data && sc->stts_data && sc->stts_data[0].duration &&

  1959.             sc->ctts_data[0].duration / sc->stts_data[0].duration > 16) {

  1960.             /* more than 16 frames delay, dts are likely wrong

  1961.                this happens with files created by iMovie */

  1962.             sc->wrong_dts = 1;

  1963.             st->codec->has_b_frames = 1;

  1964.         }

  1965.     }

  1966. 

  1967.     /* only use old uncompressed audio chunk demuxing when stts specifies it */

  1968.     if (!(st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&

  1969.           sc->stts_count == 1 && sc->stts_data[0].duration == 1)) {

  1970.         unsigned int current_sample = 0;

  1971.         unsigned int stts_sample = 0;

  1972.         unsigned int sample_size;

  1973.         unsigned int distance = 0;

  1974.         unsigned int rap_group_index = 0;

  1975.         unsigned int rap_group_sample = 0;

  1976.         int rap_group_present = sc->rap_group_count && sc->rap_group;

  1977.         int key_off = (sc->keyframes && sc->keyframes[0] > 0) || (sc->stps_data && sc->stps_data[0] > 0);

  1978. 

  1979.         current_dts -= sc->dts_shift;

  1980. 

  1981.         if (!sc->sample_count)

  1982.             return;

  1983.         if (sc->sample_count >= UINT_MAX / sizeof(*st->index_entries) - st->nb_index_entries)

  1984.             return;

  1985.         if (av_reallocp_array(&st->index_entries,

  1986.                               st->nb_index_entries + sc->sample_count,

  1987.                               sizeof(*st->index_entries)) < 0) {

  1988.             st->nb_index_entries = 0;

  1989.             return;

  1990.         }

  1991.         st->index_entries_allocated_size = (st->nb_index_entries + sc->sample_count) * sizeof(*st->index_entries);

  1992. 

  1993.         for (i = 0; i < sc->chunk_count; i++) {

  1994.             current_offset = sc->chunk_offsets[i];

  1995.             while (stsc_index + 1 < sc->stsc_count &&

  1996.                 i + 1 == sc->stsc_data[stsc_index + 1].first)

  1997.                 stsc_index++;

  1998.             for (j = 0; j < sc->stsc_data[stsc_index].count; j++) {

  1999.                 int keyframe = 0;

  2000.                 if (current_sample >= sc->sample_count) {

  2001.                     av_log(mov->fc, AV_LOG_ERROR, "wrong sample count\n");

  2002.                     return;

  2003.                 }

  2004. 

  2005.                 if (!sc->keyframe_absent && (!sc->keyframe_count || current_sample+key_off == sc->keyframes[stss_index])) {

  2006.                     keyframe = 1;

  2007.                     if (stss_index + 1 < sc->keyframe_count)

  2008.                         stss_index++;

  2009.                 } else if (sc->stps_count && current_sample+key_off == sc->stps_data[stps_index]) {

  2010.                     keyframe = 1;

  2011.                     if (stps_index + 1 < sc->stps_count)

  2012.                         stps_index++;

  2013.                 }

  2014.                 if (rap_group_present && rap_group_index < sc->rap_group_count) {

  2015.                     if (sc->rap_group[rap_group_index].index > 0)

  2016.                         keyframe = 1;

  2017.                     if (++rap_group_sample == sc->rap_group[rap_group_index].count) {

  2018.                         rap_group_sample = 0;

  2019.                         rap_group_index++;

  2020.                     }

  2021.                 }

  2022.                 if (keyframe)

  2023.                     distance = 0;

  2024.                 sample_size = sc->sample_size > 0 ? sc->sample_size : sc->sample_sizes[current_sample];

  2025.                 if (sc->pseudo_stream_id == -1 ||

  2026.                    sc->stsc_data[stsc_index].id - 1 == sc->pseudo_stream_id) {

  2027.                     AVIndexEntry *e = &st->index_entries[st->nb_index_entries++];

  2028.                     e->pos = current_offset;

  2029.                     e->timestamp = current_dts;

  2030.                     e->size = sample_size;

  2031.                     e->min_distance = distance;

  2032.                     e->flags = keyframe ? AVINDEX_KEYFRAME : 0;

  2033.                     av_dlog(mov->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "

  2034.                             "size %d, distance %d, keyframe %d\n", st->index, current_sample,

  2035.                             current_offset, current_dts, sample_size, distance, keyframe);

  2036.                 }

  2037. 

  2038.                 current_offset += sample_size;

  2039.                 stream_size += sample_size;

  2040.                 current_dts += sc->stts_data[stts_index].duration;

  2041.                 distance++;

  2042.                 stts_sample++;

  2043.                 current_sample++;

  2044.                 if (stts_index + 1 < sc->stts_count && stts_sample == sc->stts_data[stts_index].count) {

  2045.                     stts_sample = 0;

  2046.                     stts_index++;

  2047.                 }

  2048.             }

  2049.         }

  2050.         if (st->duration > 0)

  2051.             st->codec->bit_rate = stream_size*8*sc->time_scale/st->duration;

  2052.     } else {

  2053.         unsigned chunk_samples, total = 0;

  2054. 

  2055.         // compute total chunk count

  2056.         for (i = 0; i < sc->stsc_count; i++) {

  2057.             unsigned count, chunk_count;

  2058. 

  2059.             chunk_samples = sc->stsc_data[i].count;

  2060.             if (i != sc->stsc_count - 1 &&

  2061.                 sc->samples_per_frame && chunk_samples % sc->samples_per_frame) {

  2062.                 av_log(mov->fc, AV_LOG_ERROR, "error unaligned chunk\n");

  2063.                 return;

  2064.             }

  2065. 

  2066.             if (sc->samples_per_frame >= 160) { // gsm

  2067.                 count = chunk_samples / sc->samples_per_frame;

  2068.             } else if (sc->samples_per_frame > 1) {

  2069.                 unsigned samples = (1024/sc->samples_per_frame)*sc->samples_per_frame;

  2070.                 count = (chunk_samples+samples-1) / samples;

  2071.             } else {

  2072.                 count = (chunk_samples+1023) / 1024;

  2073.             }

  2074. 

  2075.             if (i < sc->stsc_count - 1)

  2076.                 chunk_count = sc->stsc_data[i+1].first - sc->stsc_data[i].first;

  2077.             else

  2078.                 chunk_count = sc->chunk_count - (sc->stsc_data[i].first - 1);

  2079.             total += chunk_count * count;

  2080.         }

  2081. 

  2082.         av_dlog(mov->fc, "chunk count %d\n", total);

  2083.         if (total >= UINT_MAX / sizeof(*st->index_entries) - st->nb_index_entries)

  2084.             return;

  2085.         if (av_reallocp_array(&st->index_entries,

  2086.                               st->nb_index_entries + total,

  2087.                               sizeof(*st->index_entries)) < 0) {

  2088.             st->nb_index_entries = 0;

  2089.             return;

  2090.         }

  2091.         st->index_entries_allocated_size = (st->nb_index_entries + total) * sizeof(*st->index_entries);

  2092. 

  2093.         // populate index

  2094.         for (i = 0; i < sc->chunk_count; i++) {

  2095.             current_offset = sc->chunk_offsets[i];

  2096.             if (stsc_index + 1 < sc->stsc_count &&

  2097.                 i + 1 == sc->stsc_data[stsc_index + 1].first)

  2098.                 stsc_index++;

  2099.             chunk_samples = sc->stsc_data[stsc_index].count;

  2100. 

  2101.             while (chunk_samples > 0) {

  2102.                 AVIndexEntry *e;

  2103.                 unsigned size, samples;

  2104. 

  2105.                 if (sc->samples_per_frame >= 160) { // gsm

  2106.                     samples = sc->samples_per_frame;

  2107.                     size = sc->bytes_per_frame;

  2108.                 } else {

  2109.                     if (sc->samples_per_frame > 1) {

  2110.                         samples = FFMIN((1024 / sc->samples_per_frame)*

  2111.                                         sc->samples_per_frame, chunk_samples);

  2112.                         size = (samples / sc->samples_per_frame) * sc->bytes_per_frame;

  2113.                     } else {

  2114.                         samples = FFMIN(1024, chunk_samples);

  2115.                         size = samples * sc->sample_size;

  2116.                     }

  2117.                 }

  2118. 

  2119.                 if (st->nb_index_entries >= total) {

  2120.                     av_log(mov->fc, AV_LOG_ERROR, "wrong chunk count %d\n", total);

  2121.                     return;

  2122.                 }

  2123.                 e = &st->index_entries[st->nb_index_entries++];

  2124.                 e->pos = current_offset;

  2125.                 e->timestamp = current_dts;

  2126.                 e->size = size;

  2127.                 e->min_distance = 0;

  2128.                 e->flags = AVINDEX_KEYFRAME;

  2129.                 av_dlog(mov->fc, "AVIndex stream %d, chunk %d, offset %"PRIx64", dts %"PRId64", "

  2130.                         "size %d, duration %d\n", st->index, i, current_offset, current_dts,

  2131.                         size, samples);

  2132. 

  2133.                 current_offset += size;

  2134.                 current_dts += samples;

  2135.                 chunk_samples -= samples;

  2136.             }

  2137.         }

  2138.     }

  2139. }

  2140. 

  2141. static int mov_open_dref(AVIOContext **pb, char *src, MOVDref *ref,

  2142.                          AVIOInterruptCB *int_cb)

  2143. {

  2144.     /* try relative path, we do not try the absolute because it can leak information about our

  2145.        system to an attacker */

  2146.     if (ref->nlvl_to > 0 && ref->nlvl_from > 0) {

  2147.         char filename[1024];

  2148.         char *src_path;

  2149.         int i, l;

  2150. 

  2151.         /* find a source dir */

  2152.         src_path = strrchr(src, '/');

  2153.         if (src_path)

  2154.             src_path++;

  2155.         else

  2156.             src_path = src;

  2157. 

  2158.         /* find a next level down to target */

  2159.         for (i = 0, l = strlen(ref->path) - 1; l >= 0; l--)

  2160.             if (ref->path[l] == '/') {

  2161.                 if (i == ref->nlvl_to - 1)

  2162.                     break;

  2163.                 else

  2164.                     i++;

  2165.             }

  2166. 

  2167.         /* compose filename if next level down to target was found */

  2168.         if (i == ref->nlvl_to - 1 && src_path - src  < sizeof(filename)) {

  2169.             memcpy(filename, src, src_path - src);

  2170.             filename[src_path - src] = 0;

  2171. 

  2172.             for (i = 1; i < ref->nlvl_from; i++)

  2173.                 av_strlcat(filename, "../", 1024);

  2174. 

  2175.             av_strlcat(filename, ref->path + l + 1, 1024);

  2176. 

  2177.             if (!avio_open2(pb, filename, AVIO_FLAG_READ, int_cb, NULL))

  2178.                 return 0;

  2179.         }

  2180.     }

  2181. 

  2182.     return AVERROR(ENOENT);

  2183. }

  2184. 

  2185. static int mov_read_trak(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2186. {

  2187.     AVStream *st;

  2188.     MOVStreamContext *sc;

  2189.     int ret;

  2190. 

  2191.     st = avformat_new_stream(c->fc, NULL);

  2192.     if (!st) return AVERROR(ENOMEM);

  2193.     st->id = c->fc->nb_streams;

  2194.     sc = av_mallocz(sizeof(MOVStreamContext));

  2195.     if (!sc) return AVERROR(ENOMEM);

  2196. 

  2197.     st->priv_data = sc;

  2198.     st->codec->codec_type = AVMEDIA_TYPE_DATA;

  2199.     sc->ffindex = st->index;

  2200. 

  2201.     if ((ret = mov_read_default(c, pb, atom)) < 0)

  2202.         return ret;

  2203. 

  2204.     /* sanity checks */

  2205.     if (sc->chunk_count && (!sc->stts_count || !sc->stsc_count ||

  2206.                             (!sc->sample_size && !sc->sample_count))) {

  2207.         av_log(c->fc, AV_LOG_ERROR, "stream %d, missing mandatory atoms, broken header\n",

  2208.                st->index);

  2209.         return 0;

  2210.     }

  2211. 

  2212.     if (sc->time_scale <= 0) {

  2213.         av_log(c->fc, AV_LOG_WARNING, "stream %d, timescale not set\n", st->index);

  2214.         sc->time_scale = c->time_scale;

  2215.         if (sc->time_scale <= 0)

  2216.             sc->time_scale = 1;

  2217.     }

  2218. 

  2219.     avpriv_set_pts_info(st, 64, 1, sc->time_scale);

  2220. 

  2221.     mov_build_index(c, st);

  2222. 

  2223.     if (sc->dref_id-1 < sc->drefs_count && sc->drefs[sc->dref_id-1].path) {

  2224.         MOVDref *dref = &sc->drefs[sc->dref_id - 1];

  2225.         if (mov_open_dref(&sc->pb, c->fc->filename, dref, &c->fc->interrupt_callback) < 0)

  2226.             av_log(c->fc, AV_LOG_ERROR,

  2227.                    "stream %d, error opening alias: path='%s', dir='%s', "

  2228.                    "filename='%s', volume='%s', nlvl_from=%d, nlvl_to=%d\n",

  2229.                    st->index, dref->path, dref->dir, dref->filename,

  2230.                    dref->volume, dref->nlvl_from, dref->nlvl_to);

  2231.     } else

  2232.         sc->pb = c->fc->pb;

  2233. 

  2234.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  2235.         if (!st->sample_aspect_ratio.num &&

  2236.             (st->codec->width != sc->width || st->codec->height != sc->height)) {

  2237.             st->sample_aspect_ratio = av_d2q(((double)st->codec->height * sc->width) /

  2238.                                              ((double)st->codec->width * sc->height), INT_MAX);

  2239.         }

  2240.     }

  2241. 

  2242.     // done for ai5q, ai52, ai55, ai1q, ai12 and ai15.

  2243.     if (!st->codec->extradata_size && st->codec->codec_id == AV_CODEC_ID_H264 &&

  2244.         TAG_IS_AVCI(st->codec->codec_tag)) {

  2245.         ret = ff_generate_avci_extradata(st);

  2246.         if (ret < 0)

  2247.             return ret;

  2248.     }

  2249. 

  2250.     switch (st->codec->codec_id) {

  2251. #if CONFIG_H261_DECODER

  2252.     case AV_CODEC_ID_H261:

  2253. #endif

  2254. #if CONFIG_H263_DECODER

  2255.     case AV_CODEC_ID_H263:

  2256. #endif

  2257. #if CONFIG_MPEG4_DECODER

  2258.     case AV_CODEC_ID_MPEG4:

  2259. #endif

  2260.         st->codec->width = 0; /* let decoder init width/height */

  2261.         st->codec->height= 0;

  2262.         break;

  2263.     }

  2264. 

  2265.     /* Do not need those anymore. */

  2266.     av_freep(&sc->chunk_offsets);

  2267.     av_freep(&sc->stsc_data);

  2268.     av_freep(&sc->sample_sizes);

  2269.     av_freep(&sc->keyframes);

  2270.     av_freep(&sc->stts_data);

  2271.     av_freep(&sc->stps_data);

  2272.     av_freep(&sc->rap_group);

  2273. 

  2274.     return 0;

  2275. }

  2276. 

  2277. static int mov_read_ilst(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2278. {

  2279.     int ret;

  2280.     c->itunes_metadata = 1;

  2281.     ret = mov_read_default(c, pb, atom);

  2282.     c->itunes_metadata = 0;

  2283.     return ret;

  2284. }

  2285. 

  2286. static int mov_read_replaygain(MOVContext *c, AVIOContext *pb, int size)

  2287. {

  2288.     int64_t end = avio_tell(pb) + size;

  2289.     uint8_t *key = NULL, *val = NULL;

  2290.     int i;

  2291. 

  2292.     for (i = 0; i < 2; i++) {

  2293.         uint8_t **p;

  2294.         uint32_t len, tag;

  2295. 

  2296.         if (end - avio_tell(pb) <= 12)

  2297.             break;

  2298. 

  2299.         len = avio_rb32(pb);

  2300.         tag = avio_rl32(pb);

  2301.         avio_skip(pb, 4); // flags

  2302. 

  2303.         if (len < 12 || len - 12 > end - avio_tell(pb))

  2304.             break;

  2305.         len -= 12;

  2306. 

  2307.         if (tag == MKTAG('n', 'a', 'm', 'e'))

  2308.             p = &key;

  2309.         else if (tag == MKTAG('d', 'a', 't', 'a') && len > 4) {

  2310.             avio_skip(pb, 4);

  2311.             len -= 4;

  2312.             p = &val;

  2313.         } else

  2314.             break;

  2315. 

  2316.         *p = av_malloc(len + 1);

  2317.         if (!*p)

  2318.             break;

  2319.         avio_read(pb, *p, len);

  2320.         (*p)[len] = 0;

  2321.     }

  2322. 

  2323.     if (key && val) {

  2324.         av_dict_set(&c->fc->metadata, key, val,

  2325.                     AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL);

  2326.         key = val = NULL;

  2327.     }

  2328. 

  2329.     avio_seek(pb, end, SEEK_SET);

  2330.     av_freep(&key);

  2331.     av_freep(&val);

  2332.     return 0;

  2333. }

  2334. 

  2335. static int mov_read_custom(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2336. {

  2337.     int64_t end = avio_tell(pb) + atom.size;

  2338.     uint32_t tag, len;

  2339. 

  2340.     if (atom.size < 8)

  2341.         goto fail;

  2342. 

  2343.     len = avio_rb32(pb);

  2344.     tag = avio_rl32(pb);

  2345. 

  2346.     if (len > atom.size)

  2347.         goto fail;

  2348. 

  2349.     if (tag == MKTAG('m', 'e', 'a', 'n') && len > 12) {

  2350.         uint8_t domain[128];

  2351.         int domain_len;

  2352. 

  2353.         avio_skip(pb, 4); // flags

  2354.         len -= 12;

  2355. 

  2356.         domain_len = avio_get_str(pb, len, domain, sizeof(domain));

  2357.         avio_skip(pb, len - domain_len);

  2358.         if (!strcmp(domain, "org.hydrogenaudio.replaygain"))

  2359.             return mov_read_replaygain(c, pb, end - avio_tell(pb));

  2360.     }

  2361. 

  2362. fail:

  2363.     av_log(c->fc, AV_LOG_VERBOSE,

  2364.            "Unhandled or malformed custom metadata of size %"PRId64"\n", atom.size);

  2365.     return 0;

  2366. }

  2367. 

  2368. static int mov_read_meta(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2369. {

  2370.     while (atom.size > 8) {

  2371.         uint32_t tag = avio_rl32(pb);

  2372.         atom.size -= 4;

  2373.         if (tag == MKTAG('h','d','l','r')) {

  2374.             avio_seek(pb, -8, SEEK_CUR);

  2375.             atom.size += 8;

  2376.             return mov_read_default(c, pb, atom);

  2377.         }

  2378.     }

  2379.     return 0;

  2380. }

  2381. 

  2382. static int mov_read_tkhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2383. {

  2384.     int i;

  2385.     int width;

  2386.     int height;

  2387.     int64_t disp_transform[2];

  2388.     int display_matrix[3][3];

  2389.     AVStream *st;

  2390.     MOVStreamContext *sc;

  2391.     int version;

  2392.     int flags;

  2393. 

  2394.     if (c->fc->nb_streams < 1)

  2395.         return 0;

  2396.     st = c->fc->streams[c->fc->nb_streams-1];

  2397.     sc = st->priv_data;

  2398. 

  2399.     version = avio_r8(pb);

  2400.     flags = avio_rb24(pb);

  2401.     st->disposition |= (flags & MOV_TKHD_FLAG_ENABLED) ? AV_DISPOSITION_DEFAULT : 0;

  2402. 

  2403.     if (version == 1) {

  2404.         avio_rb64(pb);

  2405.         avio_rb64(pb);

  2406.     } else {

  2407.         avio_rb32(pb); /* creation time */

  2408.         avio_rb32(pb); /* modification time */

  2409.     }

  2410.     st->id = (int)avio_rb32(pb); /* track id (NOT 0 !)*/

  2411.     avio_rb32(pb); /* reserved */

  2412. 

  2413.     /* highlevel (considering edits) duration in movie timebase */

  2414.     (version == 1) ? avio_rb64(pb) : avio_rb32(pb);

  2415.     avio_rb32(pb); /* reserved */

  2416.     avio_rb32(pb); /* reserved */

  2417. 

  2418.     avio_rb16(pb); /* layer */

  2419.     avio_rb16(pb); /* alternate group */

  2420.     avio_rb16(pb); /* volume */

  2421.     avio_rb16(pb); /* reserved */

  2422. 

  2423.     //read in the display matrix (outlined in ISO 14496-12, Section 6.2.2)

  2424.     // they're kept in fixed point format through all calculations

  2425.     // save u,v,z to store the whole matrix in the AV_PKT_DATA_DISPLAYMATRIX

  2426.     // side data, but the scale factor is not needed to calculate aspect ratio

  2427.     for (i = 0; i < 3; i++) {

  2428.         display_matrix[i][0] = avio_rb32(pb);   // 16.16 fixed point

  2429.         display_matrix[i][1] = avio_rb32(pb);   // 16.16 fixed point

  2430.         display_matrix[i][2] = avio_rb32(pb);   //  2.30 fixed point

  2431.     }

  2432. 

  2433.     width = avio_rb32(pb);       // 16.16 fixed point track width

  2434.     height = avio_rb32(pb);      // 16.16 fixed point track height

  2435.     sc->width = width >> 16;

  2436.     sc->height = height >> 16;

  2437. 

  2438.     // save the matrix when it is not the default identity

  2439.     if (display_matrix[0][0] != (1 << 16) ||

  2440.         display_matrix[1][1] != (1 << 16) ||

  2441.         display_matrix[2][2] != (1 << 30) ||

  2442.         display_matrix[0][1] || display_matrix[0][2] ||

  2443.         display_matrix[1][0] || display_matrix[1][2] ||

  2444.         display_matrix[2][0] || display_matrix[2][1]) {

  2445.         int i, j;

  2446. 

  2447.         av_freep(&sc->display_matrix);

  2448.         sc->display_matrix = av_malloc(sizeof(int32_t) * 9);

  2449.         if (!sc->display_matrix)

  2450.             return AVERROR(ENOMEM);

  2451. 

  2452.         for (i = 0; i < 3; i++)

  2453.             for (j = 0; j < 3; j++)

  2454.                 sc->display_matrix[i * 3 + j] = display_matrix[j][i];

  2455.     }

  2456. 

  2457.     // transform the display width/height according to the matrix

  2458.     // skip this if the display matrix is the default identity matrix

  2459.     // or if it is rotating the picture, ex iPhone 3GS

  2460.     // to keep the same scale, use [width height 1<<16]

  2461.     if (width && height &&

  2462.         ((display_matrix[0][0] != 65536  ||

  2463.           display_matrix[1][1] != 65536) &&

  2464.          !display_matrix[0][1] &&

  2465.          !display_matrix[1][0] &&

  2466.          !display_matrix[2][0] && !display_matrix[2][1])) {

  2467.         for (i = 0; i < 2; i++)

  2468.             disp_transform[i] =

  2469.                 (int64_t)  width  * display_matrix[0][i] +

  2470.                 (int64_t)  height * display_matrix[1][i] +

  2471.                 ((int64_t) display_matrix[2][i] << 16);

  2472. 

  2473.         //sample aspect ratio is new width/height divided by old width/height

  2474.         st->sample_aspect_ratio = av_d2q(

  2475.             ((double) disp_transform[0] * height) /

  2476.             ((double) disp_transform[1] * width), INT_MAX);

  2477.     }

  2478.     return 0;

  2479. }

  2480. 

  2481. static int mov_read_tfhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2482. {

  2483.     MOVFragment *frag = &c->fragment;

  2484.     MOVTrackExt *trex = NULL;

  2485.     int flags, track_id, i;

  2486. 

  2487.     avio_r8(pb); /* version */

  2488.     flags = avio_rb24(pb);

  2489. 

  2490.     track_id = avio_rb32(pb);

  2491.     if (!track_id)

  2492.         return AVERROR_INVALIDDATA;

  2493.     frag->track_id = track_id;

  2494.     for (i = 0; i < c->trex_count; i++)

  2495.         if (c->trex_data[i].track_id == frag->track_id) {

  2496.             trex = &c->trex_data[i];

  2497.             break;

  2498.         }

  2499.     if (!trex) {

  2500.         av_log(c->fc, AV_LOG_ERROR, "could not find corresponding trex\n");

  2501.         return AVERROR_INVALIDDATA;

  2502.     }

  2503. 

  2504.     frag->base_data_offset = flags & MOV_TFHD_BASE_DATA_OFFSET ?

  2505.                              avio_rb64(pb) : flags & MOV_TFHD_DEFAULT_BASE_IS_MOOF ?

  2506.                              frag->moof_offset : frag->implicit_offset;

  2507.     frag->stsd_id  = flags & MOV_TFHD_STSD_ID ? avio_rb32(pb) : trex->stsd_id;

  2508. 

  2509.     frag->duration = flags & MOV_TFHD_DEFAULT_DURATION ?

  2510.                      avio_rb32(pb) : trex->duration;

  2511.     frag->size     = flags & MOV_TFHD_DEFAULT_SIZE ?

  2512.                      avio_rb32(pb) : trex->size;

  2513.     frag->flags    = flags & MOV_TFHD_DEFAULT_FLAGS ?

  2514.                      avio_rb32(pb) : trex->flags;

  2515.     av_dlog(c->fc, "frag flags 0x%x\n", frag->flags);

  2516.     return 0;

  2517. }

  2518. 

  2519. static int mov_read_chap(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2520. {

  2521.     c->chapter_track = avio_rb32(pb);

  2522.     return 0;

  2523. }

  2524. 

  2525. static int mov_read_trex(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2526. {

  2527.     MOVTrackExt *trex;

  2528.     int err;

  2529. 

  2530.     if ((uint64_t)c->trex_count+1 >= UINT_MAX / sizeof(*c->trex_data))

  2531.         return AVERROR_INVALIDDATA;

  2532.     if ((err = av_reallocp_array(&c->trex_data, c->trex_count + 1,

  2533.                                  sizeof(*c->trex_data))) < 0) {

  2534.         c->trex_count = 0;

  2535.         return err;

  2536.     }

  2537.     trex = &c->trex_data[c->trex_count++];

  2538.     avio_r8(pb); /* version */

  2539.     avio_rb24(pb); /* flags */

  2540.     trex->track_id = avio_rb32(pb);

  2541.     trex->stsd_id  = avio_rb32(pb);

  2542.     trex->duration = avio_rb32(pb);

  2543.     trex->size     = avio_rb32(pb);

  2544.     trex->flags    = avio_rb32(pb);

  2545.     return 0;

  2546. }

  2547. 

  2548. static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2549. {

  2550.     MOVFragment *frag = &c->fragment;

  2551.     AVStream *st = NULL;

  2552.     MOVStreamContext *sc;

  2553.     MOVStts *ctts_data;

  2554.     uint64_t offset;

  2555.     int64_t dts;

  2556.     int data_offset = 0;

  2557.     unsigned entries, first_sample_flags = frag->flags;

  2558.     int flags, distance, i, found_keyframe = 0, err;

  2559. 

  2560.     for (i = 0; i < c->fc->nb_streams; i++) {

  2561.         if (c->fc->streams[i]->id == frag->track_id) {

  2562.             st = c->fc->streams[i];

  2563.             break;

  2564.         }

  2565.     }

  2566.     if (!st) {

  2567.         av_log(c->fc, AV_LOG_ERROR, "could not find corresponding track id %d\n", frag->track_id);

  2568.         return AVERROR_INVALIDDATA;

  2569.     }

  2570.     sc = st->priv_data;

  2571.     if (sc->pseudo_stream_id+1 != frag->stsd_id)

  2572.         return 0;

  2573.     avio_r8(pb); /* version */

  2574.     flags = avio_rb24(pb);

  2575.     entries = avio_rb32(pb);

  2576.     av_dlog(c->fc, "flags 0x%x entries %d\n", flags, entries);

  2577. 

  2578.     /* Always assume the presence of composition time offsets.

  2579.      * Without this assumption, for instance, we cannot deal with a track in fragmented movies that meet the following.

  2580.      *  1) in the initial movie, there are no samples.

  2581.      *  2) in the first movie fragment, there is only one sample without composition time offset.

  2582.      *  3) in the subsequent movie fragments, there are samples with composition time offset. */

  2583.     if (!sc->ctts_count && sc->sample_count)

  2584.     {

  2585.         /* Complement ctts table if moov atom doesn't have ctts atom. */

  2586.         ctts_data = av_realloc(NULL, sizeof(*sc->ctts_data));

  2587.         if (!ctts_data)

  2588.             return AVERROR(ENOMEM);

  2589.         sc->ctts_data = ctts_data;

  2590.         sc->ctts_data[sc->ctts_count].count = sc->sample_count;

  2591.         sc->ctts_data[sc->ctts_count].duration = 0;

  2592.         sc->ctts_count++;

  2593.     }

  2594.     if ((uint64_t)entries+sc->ctts_count >= UINT_MAX/sizeof(*sc->ctts_data))

  2595.         return AVERROR_INVALIDDATA;

  2596.     if ((err = av_reallocp_array(&sc->ctts_data, entries + sc->ctts_count,

  2597.                                  sizeof(*sc->ctts_data))) < 0) {

  2598.         sc->ctts_count = 0;

  2599.         return err;

  2600.     }

  2601.     if (flags & MOV_TRUN_DATA_OFFSET)        data_offset        = avio_rb32(pb);

  2602.     if (flags & MOV_TRUN_FIRST_SAMPLE_FLAGS) first_sample_flags = avio_rb32(pb);

  2603.     dts    = sc->track_end - sc->time_offset;

  2604.     offset = frag->base_data_offset + data_offset;

  2605.     distance = 0;

  2606.     av_dlog(c->fc, "first sample flags 0x%x\n", first_sample_flags);

  2607.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  2608.         unsigned sample_size = frag->size;

  2609.         int sample_flags = i ? frag->flags : first_sample_flags;

  2610.         unsigned sample_duration = frag->duration;

  2611.         int keyframe = 0;

  2612. 

  2613.         if (flags & MOV_TRUN_SAMPLE_DURATION) sample_duration = avio_rb32(pb);

  2614.         if (flags & MOV_TRUN_SAMPLE_SIZE)     sample_size     = avio_rb32(pb);

  2615.         if (flags & MOV_TRUN_SAMPLE_FLAGS)    sample_flags    = avio_rb32(pb);

  2616.         sc->ctts_data[sc->ctts_count].count = 1;

  2617.         sc->ctts_data[sc->ctts_count].duration = (flags & MOV_TRUN_SAMPLE_CTS) ?

  2618.                                                   avio_rb32(pb) : 0;

  2619.         sc->ctts_count++;

  2620.         if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)

  2621.             keyframe = 1;

  2622.         else if (!found_keyframe)

  2623.             keyframe = found_keyframe =

  2624.                 !(sample_flags & (MOV_FRAG_SAMPLE_FLAG_IS_NON_SYNC |

  2625.                                   MOV_FRAG_SAMPLE_FLAG_DEPENDS_YES));

  2626.         if (keyframe)

  2627.             distance = 0;

  2628.         av_add_index_entry(st, offset, dts, sample_size, distance,

  2629.                            keyframe ? AVINDEX_KEYFRAME : 0);

  2630.         av_dlog(c->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "

  2631.                 "size %d, distance %d, keyframe %d\n", st->index, sc->sample_count+i,

  2632.                 offset, dts, sample_size, distance, keyframe);

  2633.         distance++;

  2634.         dts += sample_duration;

  2635.         offset += sample_size;

  2636.         sc->data_size += sample_size;

  2637.     }

  2638. 

  2639.     if (pb->eof_reached)

  2640.         return AVERROR_EOF;

  2641. 

  2642.     frag->implicit_offset = offset;

  2643.     st->duration = sc->track_end = dts + sc->time_offset;

  2644.     return 0;

  2645. }

  2646. 

  2647. /* this atom should be null (from specs), but some buggy files put the 'moov' atom inside it... */

  2648. /* like the files created with Adobe Premiere 5.0, for samples see */

  2649. /* http://graphics.tudelft.nl/~wouter/publications/soundtests/ */

  2650. static int mov_read_wide(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2651. {

  2652.     int err;

  2653. 

  2654.     if (atom.size < 8)

  2655.         return 0; /* continue */

  2656.     if (avio_rb32(pb) != 0) { /* 0 sized mdat atom... use the 'wide' atom size */

  2657.         avio_skip(pb, atom.size - 4);

  2658.         return 0;

  2659.     }

  2660.     atom.type = avio_rl32(pb);

  2661.     atom.size -= 8;

  2662.     if (atom.type != MKTAG('m','d','a','t')) {

  2663.         avio_skip(pb, atom.size);

  2664.         return 0;

  2665.     }

  2666.     err = mov_read_mdat(c, pb, atom);

  2667.     return err;

  2668. }

  2669. 

  2670. static int mov_read_cmov(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2671. {

  2672. #if CONFIG_ZLIB

  2673.     AVIOContext ctx;

  2674.     uint8_t *cmov_data;

  2675.     uint8_t *moov_data; /* uncompressed data */

  2676.     long cmov_len, moov_len;

  2677.     int ret = -1;

  2678. 

  2679.     avio_rb32(pb); /* dcom atom */

  2680.     if (avio_rl32(pb) != MKTAG('d','c','o','m'))

  2681.         return AVERROR_INVALIDDATA;

  2682.     if (avio_rl32(pb) != MKTAG('z','l','i','b')) {

  2683.         av_log(c->fc, AV_LOG_ERROR, "unknown compression for cmov atom !");

  2684.         return AVERROR_INVALIDDATA;

  2685.     }

  2686.     avio_rb32(pb); /* cmvd atom */

  2687.     if (avio_rl32(pb) != MKTAG('c','m','v','d'))

  2688.         return AVERROR_INVALIDDATA;

  2689.     moov_len = avio_rb32(pb); /* uncompressed size */

  2690.     cmov_len = atom.size - 6 * 4;

  2691. 

  2692.     cmov_data = av_malloc(cmov_len);

  2693.     if (!cmov_data)

  2694.         return AVERROR(ENOMEM);

  2695.     moov_data = av_malloc(moov_len);

  2696.     if (!moov_data) {

  2697.         av_free(cmov_data);

  2698.         return AVERROR(ENOMEM);

  2699.     }

  2700.     avio_read(pb, cmov_data, cmov_len);

  2701.     if (uncompress (moov_data, (uLongf *) &moov_len, (const Bytef *)cmov_data, cmov_len) != Z_OK)

  2702.         goto free_and_return;

  2703.     if (ffio_init_context(&ctx, moov_data, moov_len, 0, NULL, NULL, NULL, NULL) != 0)

  2704.         goto free_and_return;

  2705.     atom.type = MKTAG('m','o','o','v');

  2706.     atom.size = moov_len;

  2707.     ret = mov_read_default(c, &ctx, atom);

  2708. free_and_return:

  2709.     av_free(moov_data);

  2710.     av_free(cmov_data);

  2711.     return ret;

  2712. #else

  2713.     av_log(c->fc, AV_LOG_ERROR, "this file requires zlib support compiled in\n");

  2714.     return AVERROR(ENOSYS);

  2715. #endif

  2716. }

  2717. 

  2718. /* edit list atom */

  2719. static int mov_read_elst(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2720. {

  2721.     MOVStreamContext *sc;

  2722.     int i, edit_count, version;

  2723. 

  2724.     if (c->fc->nb_streams < 1)

  2725.         return 0;

  2726.     sc = c->fc->streams[c->fc->nb_streams-1]->priv_data;

  2727. 

  2728.     version = avio_r8(pb); /* version */

  2729.     avio_rb24(pb); /* flags */

  2730.     edit_count = avio_rb32(pb); /* entries */

  2731. 

  2732.     if ((uint64_t)edit_count*12+8 > atom.size)

  2733.         return AVERROR_INVALIDDATA;

  2734. 

  2735.     for (i=0; i<edit_count; i++){

  2736.         int64_t time;

  2737.         int64_t duration;

  2738.         if (version == 1) {

  2739.             duration = avio_rb64(pb);

  2740.             time     = avio_rb64(pb);

  2741.         } else {

  2742.             duration = avio_rb32(pb); /* segment duration */

  2743.             time     = (int32_t)avio_rb32(pb); /* media time */

  2744.         }

  2745.         avio_rb32(pb); /* Media rate */

  2746.         if (i == 0 && time >= -1) {

  2747.             sc->time_offset = time != -1 ? time : -duration;

  2748.         }

  2749.     }

  2750. 

  2751.     if (edit_count > 1)

  2752.         av_log(c->fc, AV_LOG_WARNING, "multiple edit list entries, "

  2753.                "a/v desync might occur, patch welcome\n");

  2754. 

  2755.     av_dlog(c->fc, "track[%i].edit_count = %i\n", c->fc->nb_streams-1, edit_count);

  2756.     return 0;

  2757. }

  2758. 

  2759. static const MOVParseTableEntry mov_default_parse_table[] = {

  2760. { MKTAG('a','v','s','s'), mov_read_extradata },

  2761. { MKTAG('c','h','p','l'), mov_read_chpl },

  2762. { MKTAG('c','o','6','4'), mov_read_stco },

  2763. { MKTAG('c','t','t','s'), mov_read_ctts }, /* composition time to sample */

  2764. { MKTAG('d','i','n','f'), mov_read_default },

  2765. { MKTAG('d','r','e','f'), mov_read_dref },

  2766. { MKTAG('e','d','t','s'), mov_read_default },

  2767. { MKTAG('e','l','s','t'), mov_read_elst },

  2768. { MKTAG('e','n','d','a'), mov_read_enda },

  2769. { MKTAG('f','i','e','l'), mov_read_fiel },

  2770. { MKTAG('f','t','y','p'), mov_read_ftyp },

  2771. { MKTAG('g','l','b','l'), mov_read_glbl },

  2772. { MKTAG('h','d','l','r'), mov_read_hdlr },

  2773. { MKTAG('i','l','s','t'), mov_read_ilst },

  2774. { MKTAG('j','p','2','h'), mov_read_extradata },

  2775. { MKTAG('m','d','a','t'), mov_read_mdat },

  2776. { MKTAG('m','d','h','d'), mov_read_mdhd },

  2777. { MKTAG('m','d','i','a'), mov_read_default },

  2778. { MKTAG('m','e','t','a'), mov_read_meta },

  2779. { MKTAG('m','i','n','f'), mov_read_default },

  2780. { MKTAG('m','o','o','f'), mov_read_moof },

  2781. { MKTAG('m','o','o','v'), mov_read_moov },

  2782. { MKTAG('m','v','e','x'), mov_read_default },

  2783. { MKTAG('m','v','h','d'), mov_read_mvhd },

  2784. { MKTAG('S','M','I',' '), mov_read_smi }, /* Sorenson extension ??? */

  2785. { MKTAG('a','l','a','c'), mov_read_extradata }, /* alac specific atom */

  2786. { MKTAG('a','v','c','C'), mov_read_glbl },

  2787. { MKTAG('p','a','s','p'), mov_read_pasp },

  2788. { MKTAG('s','t','b','l'), mov_read_default },

  2789. { MKTAG('s','t','c','o'), mov_read_stco },

  2790. { MKTAG('s','t','p','s'), mov_read_stps },

  2791. { MKTAG('s','t','r','f'), mov_read_strf },

  2792. { MKTAG('s','t','s','c'), mov_read_stsc },

  2793. { MKTAG('s','t','s','d'), mov_read_stsd }, /* sample description */

  2794. { MKTAG('s','t','s','s'), mov_read_stss }, /* sync sample */

  2795. { MKTAG('s','t','s','z'), mov_read_stsz }, /* sample size */

  2796. { MKTAG('s','t','t','s'), mov_read_stts },

  2797. { MKTAG('s','t','z','2'), mov_read_stsz }, /* compact sample size */

  2798. { MKTAG('t','k','h','d'), mov_read_tkhd }, /* track header */

  2799. { MKTAG('t','f','h','d'), mov_read_tfhd }, /* track fragment header */

  2800. { MKTAG('t','r','a','k'), mov_read_trak },

  2801. { MKTAG('t','r','a','f'), mov_read_default },

  2802. { MKTAG('t','r','e','f'), mov_read_default },

  2803. { MKTAG('c','h','a','p'), mov_read_chap },

  2804. { MKTAG('t','r','e','x'), mov_read_trex },

  2805. { MKTAG('t','r','u','n'), mov_read_trun },

  2806. { MKTAG('u','d','t','a'), mov_read_default },

  2807. { MKTAG('w','a','v','e'), mov_read_wave },

  2808. { MKTAG('e','s','d','s'), mov_read_esds },

  2809. { MKTAG('d','a','c','3'), mov_read_dac3 }, /* AC-3 info */

  2810. { MKTAG('d','e','c','3'), mov_read_dec3 }, /* EAC-3 info */

  2811. { MKTAG('w','i','d','e'), mov_read_wide }, /* place holder */

  2812. { MKTAG('w','f','e','x'), mov_read_wfex },

  2813. { MKTAG('c','m','o','v'), mov_read_cmov },

  2814. { MKTAG('c','h','a','n'), mov_read_chan }, /* channel layout */

  2815. { MKTAG('d','v','c','1'), mov_read_dvc1 },

  2816. { MKTAG('s','b','g','p'), mov_read_sbgp },

  2817. { MKTAG('h','v','c','C'), mov_read_glbl },

  2818. { MKTAG('-','-','-','-'), mov_read_custom },

  2819. { 0, NULL }

  2820. };

  2821. 

  2822. static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2823. {

  2824.     int64_t total_size = 0;

  2825.     MOVAtom a;

  2826.     int i;

  2827. 

  2828.     if (atom.size < 0)

  2829.         atom.size = INT64_MAX;

  2830.     while (total_size + 8 < atom.size && !pb->eof_reached) {

  2831.         int (*parse)(MOVContext*, AVIOContext*, MOVAtom) = NULL;

  2832.         a.size = atom.size;

  2833.         a.type=0;

  2834.         if (atom.size >= 8) {

  2835.             a.size = avio_rb32(pb);

  2836.             a.type = avio_rl32(pb);

  2837.         }

  2838.         av_dlog(c->fc, "type: %08x '%.4s' parent:'%.4s' sz: %"PRId64" %"PRId64" %"PRId64"\n",

  2839.                 a.type, (char*)&a.type, (char*)&atom.type, a.size, total_size, atom.size);

  2840.         total_size += 8;

  2841.         if (a.size == 1) { /* 64 bit extended size */

  2842.             a.size = avio_rb64(pb) - 8;

  2843.             total_size += 8;

  2844.         }

  2845.         if (a.size == 0) {

  2846.             a.size = atom.size - total_size;

  2847.             if (a.size <= 8)

  2848.                 break;

  2849.         }

  2850.         a.size -= 8;

  2851.         if (a.size < 0)

  2852.             break;

  2853.         a.size = FFMIN(a.size, atom.size - total_size);

  2854. 

  2855.         for (i = 0; mov_default_parse_table[i].type; i++)

  2856.             if (mov_default_parse_table[i].type == a.type) {

  2857.                 parse = mov_default_parse_table[i].parse;

  2858.                 break;

  2859.             }

  2860. 

  2861.         // container is user data

  2862.         if (!parse && (atom.type == MKTAG('u','d','t','a') ||

  2863.                        atom.type == MKTAG('i','l','s','t')))

  2864.             parse = mov_read_udta_string;

  2865. 

  2866.         if (!parse) { /* skip leaf atoms data */

  2867.             avio_skip(pb, a.size);

  2868.         } else {

  2869.             int64_t start_pos = avio_tell(pb);

  2870.             int64_t left;

  2871.             int err = parse(c, pb, a);

  2872.             if (err < 0)

  2873.                 return err;

  2874.             if (c->found_moov && c->found_mdat &&

  2875.                 ((!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX) ||

  2876.                  start_pos + a.size == avio_size(pb))) {

  2877.                 if (!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX)

  2878.                     c->next_root_atom = start_pos + a.size;

  2879.                 return 0;

  2880.             }

  2881.             left = a.size - avio_tell(pb) + start_pos;

  2882.             if (left > 0) /* skip garbage at atom end */

  2883.                 avio_skip(pb, left);

  2884.             else if (left < 0) {

  2885.                 av_log(c->fc, AV_LOG_WARNING,

  2886.                        "overread end of atom '%.4s' by %"PRId64" bytes\n",

  2887.                        (char*)&a.type, -left);

  2888.                 avio_seek(pb, left, SEEK_CUR);

  2889.             }

  2890.         }

  2891. 

  2892.         total_size += a.size;

  2893.     }

  2894. 

  2895.     if (total_size < atom.size && atom.size < 0x7ffff)

  2896.         avio_skip(pb, atom.size - total_size);

  2897. 

  2898.     return 0;

  2899. }

  2900. 

  2901. static int mov_probe(AVProbeData *p)

  2902. {

  2903.     unsigned int offset;

  2904.     uint32_t tag;

  2905.     int score = 0;

  2906. 

  2907.     /* check file header */

  2908.     offset = 0;

  2909.     for (;;) {

  2910.         /* ignore invalid offset */

  2911.         if ((offset + 8) > (unsigned int)p->buf_size)

  2912.             return score;

  2913.         tag = AV_RL32(p->buf + offset + 4);

  2914.         switch(tag) {

  2915.         /* check for obvious tags */

  2916.         case MKTAG('j','P',' ',' '): /* jpeg 2000 signature */

  2917.         case MKTAG('m','o','o','v'):

  2918.         case MKTAG('m','d','a','t'):

  2919.         case MKTAG('p','n','o','t'): /* detect movs with preview pics like ew.mov and april.mov */

  2920.         case MKTAG('u','d','t','a'): /* Packet Video PVAuthor adds this and a lot of more junk */

  2921.         case MKTAG('f','t','y','p'):

  2922.             return AVPROBE_SCORE_MAX;

  2923.         /* those are more common words, so rate then a bit less */

  2924.         case MKTAG('e','d','i','w'): /* xdcam files have reverted first tags */

  2925.         case MKTAG('w','i','d','e'):

  2926.         case MKTAG('f','r','e','e'):

  2927.         case MKTAG('j','u','n','k'):

  2928.         case MKTAG('p','i','c','t'):

  2929.             return AVPROBE_SCORE_MAX - 5;

  2930.         case MKTAG(0x82,0x82,0x7f,0x7d):

  2931.         case MKTAG('s','k','i','p'):

  2932.         case MKTAG('u','u','i','d'):

  2933.         case MKTAG('p','r','f','l'):

  2934.             offset = AV_RB32(p->buf+offset) + offset;

  2935.             /* if we only find those cause probedata is too small at least rate them */

  2936.             score = AVPROBE_SCORE_EXTENSION;

  2937.             break;

  2938.         default:

  2939.             /* unrecognized tag */

  2940.             return score;

  2941.         }

  2942.     }

  2943. }

  2944. 

  2945. // must be done after parsing all trak because there's no order requirement

  2946. static void mov_read_chapters(AVFormatContext *s)

  2947. {

  2948.     MOVContext *mov = s->priv_data;

  2949.     AVStream *st = NULL;

  2950.     MOVStreamContext *sc;

  2951.     int64_t cur_pos;

  2952.     int i;

  2953. 

  2954.     for (i = 0; i < s->nb_streams; i++)

  2955.         if (s->streams[i]->id == mov->chapter_track) {

  2956.             st = s->streams[i];

  2957.             break;

  2958.         }

  2959.     if (!st) {

  2960.         av_log(s, AV_LOG_ERROR, "Referenced QT chapter track not found\n");

  2961.         return;

  2962.     }

  2963. 

  2964.     st->discard = AVDISCARD_ALL;

  2965.     sc = st->priv_data;

  2966.     cur_pos = avio_tell(sc->pb);

  2967. 

  2968.     for (i = 0; i < st->nb_index_entries; i++) {

  2969.         AVIndexEntry *sample = &st->index_entries[i];

  2970.         int64_t end = i+1 < st->nb_index_entries ? st->index_entries[i+1].timestamp : st->duration;

  2971.         uint8_t *title;

  2972.         uint16_t ch;

  2973.         int len, title_len;

  2974. 

  2975.         if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {

  2976.             av_log(s, AV_LOG_ERROR, "Chapter %d not found in file\n", i);

  2977.             goto finish;

  2978.         }

  2979. 

  2980.         // the first two bytes are the length of the title

  2981.         len = avio_rb16(sc->pb);

  2982.         if (len > sample->size-2)

  2983.             continue;

  2984.         title_len = 2*len + 1;

  2985.         if (!(title = av_mallocz(title_len)))

  2986.             goto finish;

  2987. 

  2988.         // The samples could theoretically be in any encoding if there's an encd

  2989.         // atom following, but in practice are only utf-8 or utf-16, distinguished

  2990.         // instead by the presence of a BOM

  2991.         if (!len) {

  2992.             title[0] = 0;

  2993.         } else {

  2994.             ch = avio_rb16(sc->pb);

  2995.             if (ch == 0xfeff)

  2996.                 avio_get_str16be(sc->pb, len, title, title_len);

  2997.             else if (ch == 0xfffe)

  2998.                 avio_get_str16le(sc->pb, len, title, title_len);

  2999.             else {

  3000.                 AV_WB16(title, ch);

  3001.                 if (len == 1 || len == 2)

  3002.                     title[len] = 0;

  3003.                 else

  3004.                     avio_get_str(sc->pb, len - 2, title + 2, title_len - 2);

  3005.             }

  3006.         }

  3007. 

  3008.         avpriv_new_chapter(s, i, st->time_base, sample->timestamp, end, title);

  3009.         av_freep(&title);

  3010.     }

  3011. finish:

  3012.     avio_seek(sc->pb, cur_pos, SEEK_SET);

  3013. }

  3014. 

  3015. static int mov_read_close(AVFormatContext *s)

  3016. {

  3017.     MOVContext *mov = s->priv_data;

  3018.     int i, j;

  3019. 

  3020.     for (i = 0; i < s->nb_streams; i++) {

  3021.         AVStream *st = s->streams[i];

  3022.         MOVStreamContext *sc = st->priv_data;

  3023. 

  3024.         av_freep(&sc->ctts_data);

  3025.         for (j = 0; j < sc->drefs_count; j++) {

  3026.             av_freep(&sc->drefs[j].path);

  3027.             av_freep(&sc->drefs[j].dir);

  3028.         }

  3029.         av_freep(&sc->drefs);

  3030.         if (sc->pb && sc->pb != s->pb)

  3031.             avio_close(sc->pb);

  3032. 

  3033.         av_freep(&sc->chunk_offsets);

  3034.         av_freep(&sc->stsc_data);

  3035.         av_freep(&sc->sample_sizes);

  3036.         av_freep(&sc->keyframes);

  3037.         av_freep(&sc->stts_data);

  3038.         av_freep(&sc->stps_data);

  3039.         av_freep(&sc->rap_group);

  3040.         av_freep(&sc->display_matrix);

  3041.     }

  3042. 

  3043.     if (mov->dv_demux) {

  3044.         for (i = 0; i < mov->dv_fctx->nb_streams; i++) {

  3045.             av_freep(&mov->dv_fctx->streams[i]->codec);

  3046.             av_freep(&mov->dv_fctx->streams[i]);

  3047.         }

  3048.         av_freep(&mov->dv_fctx);

  3049.         av_freep(&mov->dv_demux);

  3050.     }

  3051. 

  3052.     av_freep(&mov->trex_data);

  3053. 

  3054.     return 0;

  3055. }

  3056. 

  3057. static int mov_read_header(AVFormatContext *s)

  3058. {

  3059.     MOVContext *mov = s->priv_data;

  3060.     AVIOContext *pb = s->pb;

  3061.     int err;

  3062.     MOVAtom atom = { AV_RL32("root") };

  3063.     int i;

  3064. 

  3065.     mov->fc = s;

  3066.     /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */

  3067.     if (pb->seekable)

  3068.         atom.size = avio_size(pb);

  3069.     else

  3070.         atom.size = INT64_MAX;

  3071. 

  3072.     /* check MOV header */

  3073.     if ((err = mov_read_default(mov, pb, atom)) < 0) {

  3074.         av_log(s, AV_LOG_ERROR, "error reading header: %d\n", err);

  3075.         mov_read_close(s);

  3076.         return err;

  3077.     }

  3078.     if (!mov->found_moov) {

  3079.         av_log(s, AV_LOG_ERROR, "moov atom not found\n");

  3080.         mov_read_close(s);

  3081.         return AVERROR_INVALIDDATA;

  3082.     }

  3083.     av_dlog(mov->fc, "on_parse_exit_offset=%"PRId64"\n", avio_tell(pb));

  3084. 

  3085.     if (pb->seekable && mov->chapter_track > 0)

  3086.         mov_read_chapters(s);

  3087. 

  3088.     for (i = 0; i < s->nb_streams; i++) {

  3089.         AVStream *st = s->streams[i];

  3090.         MOVStreamContext *sc = st->priv_data;

  3091. 

  3092.         if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {

  3093.             if (st->codec->width <= 0 && st->codec->width <= 0) {

  3094.                 st->codec->width  = sc->width;

  3095.                 st->codec->height = sc->height;

  3096.             }

  3097.             if (st->codec->codec_id == AV_CODEC_ID_DVD_SUBTITLE) {

  3098.                 if ((err = mov_rewrite_dvd_sub_extradata(st)) < 0)

  3099.                     return err;

  3100.             }

  3101.         }

  3102.     }

  3103. 

  3104.     if (mov->trex_data) {

  3105.         for (i = 0; i < s->nb_streams; i++) {

  3106.             AVStream *st = s->streams[i];

  3107.             MOVStreamContext *sc = st->priv_data;

  3108.             if (st->duration > 0)

  3109.                 st->codec->bit_rate = sc->data_size * 8 * sc->time_scale / st->duration;

  3110.         }

  3111.     }

  3112. 

  3113.     for (i = 0; i < s->nb_streams; i++) {

  3114.         AVStream *st = s->streams[i];

  3115.         MOVStreamContext *sc = st->priv_data;

  3116. 

  3117.         switch (st->codec->codec_type) {

  3118.         case AVMEDIA_TYPE_AUDIO:

  3119.             err = ff_replaygain_export(st, s->metadata);

  3120.             if (err < 0) {

  3121.                 mov_read_close(s);

  3122.                 return err;

  3123.             }

  3124.             break;

  3125.         case AVMEDIA_TYPE_VIDEO:

  3126.             if (sc->display_matrix) {

  3127.                 AVPacketSideData *sd, *tmp;

  3128. 

  3129.                 tmp = av_realloc_array(st->side_data,

  3130.                                        st->nb_side_data + 1, sizeof(*tmp));

  3131.                 if (!tmp)

  3132.                     return AVERROR(ENOMEM);

  3133. 

  3134.                 st->side_data = tmp;

  3135.                 st->nb_side_data++;

  3136. 

  3137.                 sd = &st->side_data[st->nb_side_data - 1];

  3138.                 sd->type = AV_PKT_DATA_DISPLAYMATRIX;

  3139.                 sd->size = sizeof(int32_t) * 9;

  3140.                 sd->data = (uint8_t*)sc->display_matrix;

  3141.                 sc->display_matrix = NULL;

  3142.             }

  3143.             break;

  3144.         }

  3145.     }

  3146. 

  3147.     return 0;

  3148. }

  3149. 

  3150. static AVIndexEntry *mov_find_next_sample(AVFormatContext *s, AVStream **st)

  3151. {

  3152.     AVIndexEntry *sample = NULL;

  3153.     int64_t best_dts = INT64_MAX;

  3154.     int i;

  3155.     for (i = 0; i < s->nb_streams; i++) {

  3156.         AVStream *avst = s->streams[i];

  3157.         MOVStreamContext *msc = avst->priv_data;

  3158.         if (msc->pb && msc->current_sample < avst->nb_index_entries) {

  3159.             AVIndexEntry *current_sample = &avst->index_entries[msc->current_sample];

  3160.             int64_t dts = av_rescale(current_sample->timestamp, AV_TIME_BASE, msc->time_scale);

  3161.             av_dlog(s, "stream %d, sample %d, dts %"PRId64"\n", i, msc->current_sample, dts);

  3162.             if (!sample || (!s->pb->seekable && current_sample->pos < sample->pos) ||

  3163.                 (s->pb->seekable &&

  3164.                  ((msc->pb != s->pb && dts < best_dts) || (msc->pb == s->pb &&

  3165.                  ((FFABS(best_dts - dts) <= AV_TIME_BASE && current_sample->pos < sample->pos) ||

  3166.                   (FFABS(best_dts - dts) > AV_TIME_BASE && dts < best_dts)))))) {

  3167.                 sample = current_sample;

  3168.                 best_dts = dts;

  3169.                 *st = avst;

  3170.             }

  3171.         }

  3172.     }

  3173.     return sample;

  3174. }

  3175. 

  3176. static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)

  3177. {

  3178.     MOVContext *mov = s->priv_data;

  3179.     MOVStreamContext *sc;

  3180.     AVIndexEntry *sample;

  3181.     AVStream *st = NULL;

  3182.     int ret;

  3183.  retry:

  3184.     sample = mov_find_next_sample(s, &st);

  3185.     if (!sample) {

  3186.         mov->found_mdat = 0;

  3187.         if (!mov->next_root_atom)

  3188.             return AVERROR_EOF;

  3189.         avio_seek(s->pb, mov->next_root_atom, SEEK_SET);

  3190.         mov->next_root_atom = 0;

  3191.         if (mov_read_default(mov, s->pb, (MOVAtom){ AV_RL32("root"), INT64_MAX }) < 0 ||

  3192.             s->pb->eof_reached)

  3193.             return AVERROR_EOF;

  3194.         av_dlog(s, "read fragments, offset 0x%"PRIx64"\n", avio_tell(s->pb));

  3195.         goto retry;

  3196.     }

  3197.     sc = st->priv_data;

  3198.     /* must be done just before reading, to avoid infinite loop on sample */

  3199.     sc->current_sample++;

  3200. 

  3201.     if (st->discard != AVDISCARD_ALL) {

  3202.         if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {

  3203.             av_log(mov->fc, AV_LOG_ERROR, "stream %d, offset 0x%"PRIx64": partial file\n",

  3204.                    sc->ffindex, sample->pos);

  3205.             return AVERROR_INVALIDDATA;

  3206.         }

  3207.         ret = av_get_packet(sc->pb, pkt, sample->size);

  3208.         if (ret < 0)

  3209.             return ret;

  3210.         if (sc->has_palette) {

  3211.             uint8_t *pal;

  3212. 

  3213.             pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);

  3214.             if (!pal) {

  3215.                 av_log(mov->fc, AV_LOG_ERROR, "Cannot append palette to packet\n");

  3216.             } else {

  3217.                 memcpy(pal, sc->palette, AVPALETTE_SIZE);

  3218.                 sc->has_palette = 0;

  3219.             }

  3220.         }

  3221. #if CONFIG_DV_DEMUXER

  3222.         if (mov->dv_demux && sc->dv_audio_container) {

  3223.             avpriv_dv_produce_packet(mov->dv_demux, pkt, pkt->data, pkt->size);

  3224.             av_free(pkt->data);

  3225.             pkt->size = 0;

  3226.             ret = avpriv_dv_get_packet(mov->dv_demux, pkt);

  3227.             if (ret < 0)

  3228.                 return ret;

  3229.         }

  3230. #endif

  3231.     }

  3232. 

  3233.     pkt->stream_index = sc->ffindex;

  3234.     pkt->dts = sample->timestamp;

  3235.     if (sc->ctts_data && sc->ctts_index < sc->ctts_count) {

  3236.         pkt->pts = pkt->dts + sc->dts_shift + sc->ctts_data[sc->ctts_index].duration;

  3237.         /* update ctts context */

  3238.         sc->ctts_sample++;

  3239.         if (sc->ctts_index < sc->ctts_count &&

  3240.             sc->ctts_data[sc->ctts_index].count == sc->ctts_sample) {

  3241.             sc->ctts_index++;

  3242.             sc->ctts_sample = 0;

  3243.         }

  3244.         if (sc->wrong_dts)

  3245.             pkt->dts = AV_NOPTS_VALUE;

  3246.     } else {

  3247.         int64_t next_dts = (sc->current_sample < st->nb_index_entries) ?

  3248.             st->index_entries[sc->current_sample].timestamp : st->duration;

  3249.         pkt->duration = next_dts - pkt->dts;

  3250.         pkt->pts = pkt->dts;

  3251.     }

  3252.     if (st->discard == AVDISCARD_ALL)

  3253.         goto retry;

  3254.     pkt->flags |= sample->flags & AVINDEX_KEYFRAME ? AV_PKT_FLAG_KEY : 0;

  3255.     pkt->pos = sample->pos;

  3256.     av_dlog(s, "stream %d, pts %"PRId64", dts %"PRId64", pos 0x%"PRIx64", duration %d\n",

  3257.             pkt->stream_index, pkt->pts, pkt->dts, pkt->pos, pkt->duration);

  3258.     return 0;

  3259. }

  3260. 

  3261. static int mov_seek_stream(AVFormatContext *s, AVStream *st, int64_t timestamp, int flags)

  3262. {

  3263.     MOVStreamContext *sc = st->priv_data;

  3264.     int sample, time_sample;

  3265.     int i;

  3266. 

  3267.     sample = av_index_search_timestamp(st, timestamp, flags);

  3268.     av_dlog(s, "stream %d, timestamp %"PRId64", sample %d\n", st->index, timestamp, sample);

  3269.     if (sample < 0 && st->nb_index_entries && timestamp < st->index_entries[0].timestamp)

  3270.         sample = 0;

  3271.     if (sample < 0) /* not sure what to do */

  3272.         return AVERROR_INVALIDDATA;

  3273.     sc->current_sample = sample;

  3274.     av_dlog(s, "stream %d, found sample %d\n", st->index, sc->current_sample);

  3275.     /* adjust ctts index */

  3276.     if (sc->ctts_data) {

  3277.         time_sample = 0;

  3278.         for (i = 0; i < sc->ctts_count; i++) {

  3279.             int next = time_sample + sc->ctts_data[i].count;

  3280.             if (next > sc->current_sample) {

  3281.                 sc->ctts_index = i;

  3282.                 sc->ctts_sample = sc->current_sample - time_sample;

  3283.                 break;

  3284.             }

  3285.             time_sample = next;

  3286.         }

  3287.     }

  3288.     return sample;

  3289. }

  3290. 

  3291. static int mov_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  3292. {

  3293.     AVStream *st;

  3294.     int64_t seek_timestamp, timestamp;

  3295.     int sample;

  3296.     int i;

  3297. 

  3298.     if (stream_index >= s->nb_streams)

  3299.         return AVERROR_INVALIDDATA;

  3300.     if (sample_time < 0)

  3301.         sample_time = 0;

  3302. 

  3303.     st = s->streams[stream_index];

  3304.     sample = mov_seek_stream(s, st, sample_time, flags);

  3305.     if (sample < 0)

  3306.         return sample;

  3307. 

  3308.     /* adjust seek timestamp to found sample timestamp */

  3309.     seek_timestamp = st->index_entries[sample].timestamp;

  3310. 

  3311.     for (i = 0; i < s->nb_streams; i++) {

  3312.         st = s->streams[i];

  3313.         if (stream_index == i)

  3314.             continue;

  3315. 

  3316.         timestamp = av_rescale_q(seek_timestamp, s->streams[stream_index]->time_base, st->time_base);

  3317.         mov_seek_stream(s, st, timestamp, flags);

  3318.     }

  3319.     return 0;

  3320. }

  3321. 

  3322. AVInputFormat ff_mov_demuxer = {

  3323.     .name           = "mov,mp4,m4a,3gp,3g2,mj2",

  3324.     .long_name      = NULL_IF_CONFIG_SMALL("QuickTime / MOV"),

  3325.     .priv_data_size = sizeof(MOVContext),

  3326.     .extensions     = "mov,mp4,m4a,3gp,3g2,mj2",

  3327.     .read_probe     = mov_probe,

  3328.     .read_header    = mov_read_header,

  3329.     .read_packet    = mov_read_packet,

  3330.     .read_close     = mov_read_close,

  3331.     .read_seek      = mov_read_seek,

  3332. };