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FFmpeg/libavformat/mov.c

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  1. /*

  2.  * MOV demuxer

  3.  * Copyright (c) 2001 Fabrice Bellard

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

  5.  *

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

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

  8.  *

  9.  * This file is part of Libav.

  10.  *

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

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

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

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

  15.  *

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

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

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

  19.  * Lesser General Public License for more details.

  20.  *

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

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

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

  24.  */

  25. 

  26. #include <limits.h>

  27. 

  28. //#define MOV_EXPORT_ALL_METADATA

  29. 

  30. #include "libavutil/attributes.h"

  31. #include "libavutil/channel_layout.h"

  32. #include "libavutil/intreadwrite.h"

  33. #include "libavutil/intfloat.h"

  34. #include "libavutil/mathematics.h"

  35. #include "libavutil/avstring.h"

  36. #include "libavutil/dict.h"

  37. #include "libavcodec/ac3tab.h"

  38. #include "avformat.h"

  39. #include "internal.h"

  40. #include "avio_internal.h"

  41. #include "riff.h"

  42. #include "isom.h"

  43. #include "libavcodec/get_bits.h"

  44. #include "id3v1.h"

  45. #include "mov_chan.h"

  46. 

  47. #if CONFIG_ZLIB

  48. #include <zlib.h>

  49. #endif

  50. 

  51. #include "qtpalette.h"

  52. 

  53. 

  54. #undef NDEBUG

  55. #include <assert.h>

  56. 

  57. /* those functions parse an atom */

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

  59. typedef struct MOVParseTableEntry {

  60.     uint32_t type;

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

  62. } MOVParseTableEntry;

  63. 

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

  65. 

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

  67.                                              unsigned len, const char *key)

  68. {

  69.     char buf[16];

  70. 

  71.     short current, total = 0;

  72.     avio_rb16(pb); // unknown

  73.     current = avio_rb16(pb);

  74.     if (len >= 6)

  75.         total = avio_rb16(pb);

  76.     if (!total)

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

  78.     else

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

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

  81. 

  82.     return 0;

  83. }

  84. 

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

  86.                                             unsigned len, const char *key)

  87. {

  88.     char buf[16];

  89. 

  90.     /* bypass padding bytes */

  91.     avio_r8(pb);

  92.     avio_r8(pb);

  93.     avio_r8(pb);

  94. 

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

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

  97. 

  98.     return 0;

  99. }

  100. 

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

  102.                                         unsigned len, const char *key)

  103. {

  104.     char buf[16];

  105. 

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

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

  108. 

  109.     return 0;

  110. }

  111. 

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

  113.                              unsigned len, const char *key)

  114. {

  115.     short genre;

  116.     char buf[20];

  117. 

  118.     avio_r8(pb); // unknown

  119. 

  120.     genre = avio_r8(pb);

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

  122.         return 0;

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

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

  125. 

  126.     return 0;

  127. }

  128. 

  129. static const uint32_t mac_to_unicode[128] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  146. };

  147. 

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

  149.                                char *dst, int dstlen)

  150. {

  151.     char *p = dst;

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

  153.     int i;

  154. 

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

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

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

  158.             *p++ = c;

  159.         else

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

  161.     }

  162.     *p = 0;

  163.     return p - dst;

  164. }

  165. 

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

  167. {

  168.     AVPacket pkt;

  169.     AVStream *st;

  170.     MOVStreamContext *sc;

  171.     enum AVCodecID id;

  172.     int ret;

  173. 

  174.     switch (type) {

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

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

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

  178.     default:

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

  180.         avio_skip(pb, len);

  181.         return 0;

  182.     }

  183. 

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

  185.     if (!st)

  186.         return AVERROR(ENOMEM);

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

  188.     if (!sc)

  189.         return AVERROR(ENOMEM);

  190.     st->priv_data = sc;

  191. 

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

  193.     if (ret < 0)

  194.         return ret;

  195. 

  196.     st->disposition              |= AV_DISPOSITION_ATTACHED_PIC;

  197. 

  198.     st->attached_pic              = pkt;

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

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

  201. 

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

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

  204. 

  205.     return 0;

  206. }

  207. 

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

  209. {

  210. #ifdef MOV_EXPORT_ALL_METADATA

  211.     char tmp_key[5];

  212. #endif

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

  214.     const char *key = NULL;

  215.     uint16_t langcode = 0;

  216.     uint32_t data_type = 0, str_size;

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

  218. 

  219.     switch (atom.type) {

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

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

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

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

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

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

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

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

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

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

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

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

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

  233.         parse = mov_metadata_gnre; break;

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

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

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

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

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

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

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

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

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

  243.         parse = mov_metadata_track_or_disc_number; break;

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

  245.         parse = mov_metadata_track_or_disc_number; break;

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

  247.         parse = mov_metadata_int8_bypass_padding; break;

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

  249.         parse = mov_metadata_int8_bypass_padding; break;

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

  251.         parse = mov_metadata_int8_no_padding; break;

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

  253.         parse = mov_metadata_int8_no_padding; break;

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

  255.         parse = mov_metadata_int8_no_padding; break;

  256.     }

  257. 

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

  259.         int data_size = avio_rb32(pb);

  260.         int tag = avio_rl32(pb);

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

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

  263.             avio_rb32(pb); // unknown

  264.             str_size = data_size - 16;

  265.             atom.size -= 16;

  266. 

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

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

  269.                 if (ret < 0) {

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

  271.                     return ret;

  272.                 }

  273.             }

  274.         } else return 0;

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

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

  277.         langcode = avio_rb16(pb);

  278.         ff_mov_lang_to_iso639(langcode, language);

  279.         atom.size -= 4;

  280.     } else

  281.         str_size = atom.size;

  282. 

  283. #ifdef MOV_EXPORT_ALL_METADATA

  284.     if (!key) {

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

  286.         key = tmp_key;

  287.     }

  288. #endif

  289. 

  290.     if (!key)

  291.         return 0;

  292.     if (atom.size < 0)

  293.         return AVERROR_INVALIDDATA;

  294. 

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

  296. 

  297.     if (parse)

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

  299.     else {

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

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

  302.         } else {

  303.             avio_read(pb, str, str_size);

  304.             str[str_size] = 0;

  305.         }

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

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

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

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

  310.         }

  311.     }

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

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

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

  315. 

  316.     return 0;

  317. }

  318. 

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

  320. {

  321.     int64_t start;

  322.     int i, nb_chapters, str_len, version;

  323.     char str[256+1];

  324. 

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

  326.         return 0;

  327. 

  328.     version = avio_r8(pb);

  329.     avio_rb24(pb);

  330.     if (version)

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

  332.     nb_chapters = avio_r8(pb);

  333. 

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

  335.         if (atom.size < 9)

  336.             return 0;

  337. 

  338.         start = avio_rb64(pb);

  339.         str_len = avio_r8(pb);

  340. 

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

  342.             return 0;

  343. 

  344.         avio_read(pb, str, str_len);

  345.         str[str_len] = 0;

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

  347.     }

  348.     return 0;

  349. }

  350. 

  351. #define MIN_DATA_ENTRY_BOX_SIZE 12

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

  353. {

  354.     AVStream *st;

  355.     MOVStreamContext *sc;

  356.     int entries, i, j;

  357. 

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

  359.         return 0;

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

  361.     sc = st->priv_data;

  362. 

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

  364.     entries = avio_rb32(pb);

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

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

  367.         return AVERROR_INVALIDDATA;

  368.     av_free(sc->drefs);

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

  370.     if (!sc->drefs)

  371.         return AVERROR(ENOMEM);

  372.     sc->drefs_count = entries;

  373. 

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

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

  376.         uint32_t size = avio_rb32(pb);

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

  378. 

  379.         if (size < 12)

  380.             return AVERROR_INVALIDDATA;

  381. 

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

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

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

  385. 

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

  387.             /* macintosh alias record */

  388.             uint16_t volume_len, len;

  389.             int16_t type;

  390. 

  391.             avio_skip(pb, 10);

  392. 

  393.             volume_len = avio_r8(pb);

  394.             volume_len = FFMIN(volume_len, 27);

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

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

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

  398. 

  399.             avio_skip(pb, 12);

  400. 

  401.             len = avio_r8(pb);

  402.             len = FFMIN(len, 63);

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

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

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

  406. 

  407.             avio_skip(pb, 16);

  408. 

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

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

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

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

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

  414. 

  415.             avio_skip(pb, 16);

  416. 

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

  418.                 if (pb->eof_reached)

  419.                     return AVERROR_EOF;

  420.                 type = avio_rb16(pb);

  421.                 len = avio_rb16(pb);

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

  423.                 if (len&1)

  424.                     len += 1;

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

  426.                     av_free(dref->path);

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

  428.                     if (!dref->path)

  429.                         return AVERROR(ENOMEM);

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

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

  432.                         len -= volume_len;

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

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

  435.                     }

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

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

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

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

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

  441.                     av_free(dref->dir);

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

  443.                     if (!dref->dir)

  444.                         return AVERROR(ENOMEM);

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

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

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

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

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

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

  451.                 } else

  452.                     avio_skip(pb, len);

  453.             }

  454.         }

  455.         avio_seek(pb, next, SEEK_SET);

  456.     }

  457.     return 0;

  458. }

  459. 

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

  461. {

  462.     AVStream *st;

  463.     uint32_t type;

  464.     uint32_t av_unused ctype;

  465. 

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

  467.         return 0;

  468. 

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

  470. 

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

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

  473. 

  474.     /* component type */

  475.     ctype = avio_rl32(pb);

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

  477. 

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

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

  480. 

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

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

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

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

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

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

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

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

  489. 

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

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

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

  493. 

  494.     return 0;

  495. }

  496. 

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

  498. {

  499.     AVStream *st;

  500.     int tag;

  501. 

  502.     if (fc->nb_streams < 1)

  503.         return 0;

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

  505. 

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

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

  508.     if (tag == MP4ESDescrTag) {

  509.         ff_mp4_parse_es_descr(pb, NULL);

  510.     } else

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

  512. 

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

  514.     if (tag == MP4DecConfigDescrTag)

  515.         ff_mp4_read_dec_config_descr(fc, st, pb);

  516.     return 0;

  517. }

  518. 

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

  520. {

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

  522. }

  523. 

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

  525. {

  526.     AVStream *st;

  527.     int ac3info, acmod, lfeon, bsmod;

  528. 

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

  530.         return 0;

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

  532. 

  533.     ac3info = avio_rb24(pb);

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

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

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

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

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

  539.     if (lfeon)

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

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

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

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

  544. 

  545.     return 0;

  546. }

  547. 

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

  549. {

  550.     AVStream *st;

  551.     int eac3info, acmod, lfeon, bsmod;

  552. 

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

  554.         return 0;

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

  556. 

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

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

  559.      * does not support them yet. */

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

  561.     eac3info = avio_rb24(pb);

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

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

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

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

  566.     if (lfeon)

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

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

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

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

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

  572. 

  573.     return 0;

  574. }

  575. 

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

  577. {

  578.     AVStream *st;

  579. 

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

  581.         return 0;

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

  583. 

  584.     if (atom.size < 16)

  585.         return 0;

  586. 

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

  588. 

  589.     return 0;

  590. }

  591. 

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

  593. {

  594.     AVStream *st;

  595. 

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

  597.         return 0;

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

  599. 

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

  601. 

  602.     return 0;

  603. }

  604. 

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

  606. {

  607.     const int num = avio_rb32(pb);

  608.     const int den = avio_rb32(pb);

  609.     AVStream *st;

  610. 

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

  612.         return 0;

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

  614. 

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

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

  617.         av_log(c->fc, AV_LOG_WARNING,

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

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

  620.                num, den);

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

  622.         st->sample_aspect_ratio.num = num;

  623.         st->sample_aspect_ratio.den = den;

  624.     }

  625.     return 0;

  626. }

  627. 

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

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

  630. {

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

  632.         return 0;

  633.     c->found_mdat=1;

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

  635. }

  636. 

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

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

  639. {

  640.     uint32_t minor_ver;

  641.     int comp_brand_size;

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

  643.     char* comp_brands_str;

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

  645. 

  646.     avio_read(pb, type, 4);

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

  648.         c->isom = 1;

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

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

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

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

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

  654. 

  655.     comp_brand_size = atom.size - 8;

  656.     if (comp_brand_size < 0)

  657.         return AVERROR_INVALIDDATA;

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

  659.     if (!comp_brands_str)

  660.         return AVERROR(ENOMEM);

  661.     avio_read(pb, comp_brands_str, comp_brand_size);

  662.     comp_brands_str[comp_brand_size] = 0;

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

  664.     av_freep(&comp_brands_str);

  665. 

  666.     return 0;

  667. }

  668. 

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

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

  671. {

  672.     int ret;

  673. 

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

  675.         return ret;

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

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

  678.     c->found_moov=1;

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

  680. }

  681. 

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

  683. {

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

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

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

  687. }

  688. 

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

  690. {

  691.     char buffer[32];

  692.     if (time) {

  693.         struct tm *ptm;

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

  695.         ptm = gmtime(&time);

  696.         if (!ptm) return;

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

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

  699.     }

  700. }

  701. 

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

  703. {

  704.     AVStream *st;

  705.     MOVStreamContext *sc;

  706.     int version;

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

  708.     unsigned lang;

  709.     time_t creation_time;

  710. 

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

  712.         return 0;

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

  714.     sc = st->priv_data;

  715. 

  716.     if (sc->time_scale) {

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

  718.         return AVERROR_INVALIDDATA;

  719.     }

  720. 

  721.     version = avio_r8(pb);

  722.     if (version > 1) {

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

  724.         return AVERROR_PATCHWELCOME;

  725.     }

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

  727.     if (version == 1) {

  728.         creation_time = avio_rb64(pb);

  729.         avio_rb64(pb);

  730.     } else {

  731.         creation_time = avio_rb32(pb);

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

  733.     }

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

  735. 

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

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

  738. 

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

  740.     if (ff_mov_lang_to_iso639(lang, language))

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

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

  743. 

  744.     return 0;

  745. }

  746. 

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

  748. {

  749.     time_t creation_time;

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

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

  752. 

  753.     if (version == 1) {

  754.         creation_time = avio_rb64(pb);

  755.         avio_rb64(pb);

  756.     } else {

  757.         creation_time = avio_rb32(pb);

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

  759.     }

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

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

  762. 

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

  764. 

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

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

  767. 

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

  769. 

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

  771. 

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

  773. 

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

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

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

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

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

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

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

  781. 

  782.     return 0;

  783. }

  784. 

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

  786. {

  787.     AVStream *st;

  788. 

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

  790.         return 0;

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

  792. 

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

  794.         return AVERROR_INVALIDDATA;

  795. 

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

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

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

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

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

  801.         return AVERROR(ENOMEM);

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

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

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

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

  806.     return 0;

  807. }

  808. 

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

  810. {

  811.     AVStream *st;

  812.     int little_endian;

  813. 

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

  815.         return 0;

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

  817. 

  818.     little_endian = avio_rb16(pb);

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

  820.     if (little_endian == 1) {

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

  822.         case AV_CODEC_ID_PCM_S24BE:

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

  824.             break;

  825.         case AV_CODEC_ID_PCM_S32BE:

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

  827.             break;

  828.         case AV_CODEC_ID_PCM_F32BE:

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

  830.             break;

  831.         case AV_CODEC_ID_PCM_F64BE:

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

  833.             break;

  834.         default:

  835.             break;

  836.         }

  837.     }

  838.     return 0;

  839. }

  840. 

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

  842. {

  843.     AVStream *st;

  844.     unsigned mov_field_order;

  845.     enum AVFieldOrder decoded_field_order = AV_FIELD_UNKNOWN;

  846. 

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

  848.         return 0;

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

  850.     if (atom.size < 2)

  851.         return AVERROR_INVALIDDATA;

  852.     mov_field_order = avio_rb16(pb);

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

  854.         decoded_field_order = AV_FIELD_PROGRESSIVE;

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

  856.         switch (mov_field_order & 0xFF) {

  857.         case 0x01: decoded_field_order = AV_FIELD_TT;

  858.                    break;

  859.         case 0x06: decoded_field_order = AV_FIELD_BB;

  860.                    break;

  861.         case 0x09: decoded_field_order = AV_FIELD_TB;

  862.                    break;

  863.         case 0x0E: decoded_field_order = AV_FIELD_BT;

  864.                    break;

  865.         }

  866.     }

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

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

  869.     }

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

  871. 

  872.     return 0;

  873. }

  874. 

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

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

  877. {

  878.     AVStream *st;

  879.     uint64_t size;

  880.     uint8_t *buf;

  881.     int err;

  882. 

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

  884.         return 0;

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

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

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

  888.         return AVERROR_INVALIDDATA;

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

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

  891.         return err;

  892.     }

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

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

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

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

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

  898.     return 0;

  899. }

  900. 

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

  902. {

  903.     AVStream *st;

  904. 

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

  906.         return 0;

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

  908. 

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

  910.         return AVERROR_INVALIDDATA;

  911. 

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

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

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

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

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

  917.             return AVERROR(ENOMEM);

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

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

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

  921.         int ret;

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

  923.             return ret;

  924.     } else

  925.         avio_skip(pb, atom.size);

  926.     return 0;

  927. }

  928. 

  929. /**

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

  931.  * nor size unlike mov_read_extradata.

  932.  */

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

  934. {

  935.     AVStream *st;

  936. 

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

  938.         return 0;

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

  940. 

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

  942.         return AVERROR_INVALIDDATA;

  943. 

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

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

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

  947.         unsigned size = avio_rb32(pb);

  948.         unsigned type = avio_rl32(pb);

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

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

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

  952.     }

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

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

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

  956.         return AVERROR(ENOMEM);

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

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

  959.     return 0;

  960. }

  961. 

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

  963. {

  964.     AVStream *st;

  965.     uint8_t profile_level;

  966. 

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

  968.         return 0;

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

  970. 

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

  972.         return AVERROR_INVALIDDATA;

  973. 

  974.     profile_level = avio_r8(pb);

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

  976.         return 0;

  977. 

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

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

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

  981.         return AVERROR(ENOMEM);

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

  983.     avio_seek(pb, 6, SEEK_CUR);

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

  985.     return 0;

  986. }

  987. 

  988. /**

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

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

  991.  * to the struct.

  992.  */

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

  994. {

  995.     AVStream *st;

  996. 

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

  998.         return 0;

  999.     if (atom.size <= 40)

  1000.         return 0;

  1001.     st = c->fc->streams[c->fc->nb_streams-1];

  1002. 

  1003.     if ((uint64_t)atom.size > (1<<30))

  1004.         return AVERROR_INVALIDDATA;

  1005. 

  1006.     av_free(st->codec->extradata);

  1007.     st->codec->extradata = av_mallocz(atom.size - 40 + FF_INPUT_BUFFER_PADDING_SIZE);

  1008.     if (!st->codec->extradata)

  1009.         return AVERROR(ENOMEM);

  1010.     st->codec->extradata_size = atom.size - 40;

  1011.     avio_skip(pb, 40);

  1012.     avio_read(pb, st->codec->extradata, atom.size - 40);

  1013.     return 0;

  1014. }

  1015. 

  1016. static int mov_read_stco(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1017. {

  1018.     AVStream *st;

  1019.     MOVStreamContext *sc;

  1020.     unsigned int i, entries;

  1021. 

  1022.     if (c->fc->nb_streams < 1)

  1023.         return 0;

  1024.     st = c->fc->streams[c->fc->nb_streams-1];

  1025.     sc = st->priv_data;

  1026. 

  1027.     avio_r8(pb); /* version */

  1028.     avio_rb24(pb); /* flags */

  1029. 

  1030.     entries = avio_rb32(pb);

  1031. 

  1032.     if (!entries)

  1033.         return 0;

  1034.     if (entries >= UINT_MAX/sizeof(int64_t))

  1035.         return AVERROR_INVALIDDATA;

  1036. 

  1037.     sc->chunk_offsets = av_malloc(entries * sizeof(int64_t));

  1038.     if (!sc->chunk_offsets)

  1039.         return AVERROR(ENOMEM);

  1040.     sc->chunk_count = entries;

  1041. 

  1042.     if      (atom.type == MKTAG('s','t','c','o'))

  1043.         for (i = 0; i < entries && !pb->eof_reached; i++)

  1044.             sc->chunk_offsets[i] = avio_rb32(pb);

  1045.     else if (atom.type == MKTAG('c','o','6','4'))

  1046.         for (i = 0; i < entries && !pb->eof_reached; i++)

  1047.             sc->chunk_offsets[i] = avio_rb64(pb);

  1048.     else

  1049.         return AVERROR_INVALIDDATA;

  1050. 

  1051.     sc->chunk_count = i;

  1052. 

  1053.     if (pb->eof_reached)

  1054.         return AVERROR_EOF;

  1055. 

  1056.     return 0;

  1057. }

  1058. 

  1059. /**

  1060.  * Compute codec id for 'lpcm' tag.

  1061.  * See CoreAudioTypes and AudioStreamBasicDescription at Apple.

  1062.  */

  1063. enum AVCodecID ff_mov_get_lpcm_codec_id(int bps, int flags)

  1064. {

  1065.     /* lpcm flags:

  1066.      * 0x1 = float

  1067.      * 0x2 = big-endian

  1068.      * 0x4 = signed

  1069.      */

  1070.     return ff_get_pcm_codec_id(bps, flags & 1, flags & 2, flags & 4 ? -1 : 0);

  1071. }

  1072. 

  1073. static int mov_codec_id(AVStream *st, uint32_t format)

  1074. {

  1075.     int id = ff_codec_get_id(ff_codec_movaudio_tags, format);

  1076. 

  1077.     if (id <= 0 &&

  1078.         ((format & 0xFFFF) == 'm' + ('s' << 8) ||

  1079.          (format & 0xFFFF) == 'T' + ('S' << 8)))

  1080.         id = ff_codec_get_id(ff_codec_wav_tags, av_bswap32(format) & 0xFFFF);

  1081. 

  1082.     if (st->codec->codec_type != AVMEDIA_TYPE_VIDEO && id > 0) {

  1083.         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

  1084.     } else if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO &&

  1085.                /* skip old asf mpeg4 tag */

  1086.                format && format != MKTAG('m','p','4','s')) {

  1087.         id = ff_codec_get_id(ff_codec_movvideo_tags, format);

  1088.         if (id <= 0)

  1089.             id = ff_codec_get_id(ff_codec_bmp_tags, format);

  1090.         if (id > 0)

  1091.             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

  1092.         else if (st->codec->codec_type == AVMEDIA_TYPE_DATA) {

  1093.             id = ff_codec_get_id(ff_codec_movsubtitle_tags, format);

  1094.             if (id > 0)

  1095.                 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;

  1096.         }

  1097.     }

  1098. 

  1099.     st->codec->codec_tag = format;

  1100. 

  1101.     return id;

  1102. }

  1103. 

  1104. static void mov_parse_stsd_video(MOVContext *c, AVIOContext *pb,

  1105.                                  AVStream *st, MOVStreamContext *sc)

  1106. {

  1107.     unsigned int color_depth, len, j;

  1108.     int color_greyscale;

  1109.     int color_table_id;

  1110. 

  1111.     avio_rb16(pb); /* version */

  1112.     avio_rb16(pb); /* revision level */

  1113.     avio_rb32(pb); /* vendor */

  1114.     avio_rb32(pb); /* temporal quality */

  1115.     avio_rb32(pb); /* spatial quality */

  1116. 

  1117.     st->codec->width  = avio_rb16(pb); /* width */

  1118.     st->codec->height = avio_rb16(pb); /* height */

  1119. 

  1120.     avio_rb32(pb); /* horiz resolution */

  1121.     avio_rb32(pb); /* vert resolution */

  1122.     avio_rb32(pb); /* data size, always 0 */

  1123.     avio_rb16(pb); /* frames per samples */

  1124. 

  1125.     len = avio_r8(pb); /* codec name, pascal string */

  1126.     if (len > 31)

  1127.         len = 31;

  1128.     mov_read_mac_string(c, pb, len, st->codec->codec_name, 32);

  1129.     if (len < 31)

  1130.         avio_skip(pb, 31 - len);

  1131.     /* codec_tag YV12 triggers an UV swap in rawdec.c */

  1132.     if (!memcmp(st->codec->codec_name, "Planar Y'CbCr 8-bit 4:2:0", 25))

  1133.         st->codec->codec_tag = MKTAG('I', '4', '2', '0');

  1134.     /* Flash Media Server uses tag H263 with Sorenson Spark */

  1135.     if (st->codec->codec_tag == MKTAG('H','2','6','3') &&

  1136.         !memcmp(st->codec->codec_name, "Sorenson H263", 13))

  1137.         st->codec->codec_id = AV_CODEC_ID_FLV1;

  1138. 

  1139.     st->codec->bits_per_coded_sample = avio_rb16(pb); /* depth */

  1140.     color_table_id = avio_rb16(pb); /* colortable id */

  1141.     av_dlog(c->fc, "depth %d, ctab id %d\n",

  1142.             st->codec->bits_per_coded_sample, color_table_id);

  1143.     /* figure out the palette situation */

  1144.     color_depth     = st->codec->bits_per_coded_sample & 0x1F;

  1145.     color_greyscale = st->codec->bits_per_coded_sample & 0x20;

  1146. 

  1147.     /* if the depth is 2, 4, or 8 bpp, file is palettized */

  1148.     if ((color_depth == 2) || (color_depth == 4) || (color_depth == 8)) {

  1149.         /* for palette traversal */

  1150.         unsigned int color_start, color_count, color_end;

  1151.         unsigned char r, g, b;

  1152. 

  1153.         if (color_greyscale) {

  1154.             int color_index, color_dec;

  1155.             /* compute the greyscale palette */

  1156.             st->codec->bits_per_coded_sample = color_depth;

  1157.             color_count = 1 << color_depth;

  1158.             color_index = 255;

  1159.             color_dec   = 256 / (color_count - 1);

  1160.             for (j = 0; j < color_count; j++) {

  1161.                 r = g = b = color_index;

  1162.                 sc->palette[j] = (r << 16) | (g << 8) | (b);

  1163.                 color_index -= color_dec;

  1164.                 if (color_index < 0)

  1165.                     color_index = 0;

  1166.             }

  1167.         } else if (color_table_id) {

  1168.             const uint8_t *color_table;

  1169.             /* if flag bit 3 is set, use the default palette */

  1170.             color_count = 1 << color_depth;

  1171.             if (color_depth == 2)

  1172.                 color_table = ff_qt_default_palette_4;

  1173.             else if (color_depth == 4)

  1174.                 color_table = ff_qt_default_palette_16;

  1175.             else

  1176.                 color_table = ff_qt_default_palette_256;

  1177. 

  1178.             for (j = 0; j < color_count; j++) {

  1179.                 r = color_table[j * 3 + 0];

  1180.                 g = color_table[j * 3 + 1];

  1181.                 b = color_table[j * 3 + 2];

  1182.                 sc->palette[j] = (r << 16) | (g << 8) | (b);

  1183.             }

  1184.         } else {

  1185.             /* load the palette from the file */

  1186.             color_start = avio_rb32(pb);

  1187.             color_count = avio_rb16(pb);

  1188.             color_end   = avio_rb16(pb);

  1189.             if ((color_start <= 255) && (color_end <= 255)) {

  1190.                 for (j = color_start; j <= color_end; j++) {

  1191.                     /* each R, G, or B component is 16 bits;

  1192.                      * only use the top 8 bits; skip alpha bytes

  1193.                      * up front */

  1194.                     avio_r8(pb);

  1195.                     avio_r8(pb);

  1196.                     r = avio_r8(pb);

  1197.                     avio_r8(pb);

  1198.                     g = avio_r8(pb);

  1199.                     avio_r8(pb);

  1200.                     b = avio_r8(pb);

  1201.                     avio_r8(pb);

  1202.                     sc->palette[j] = (r << 16) | (g << 8) | (b);

  1203.                 }

  1204.             }

  1205.         }

  1206.         sc->has_palette = 1;

  1207.     }

  1208. }

  1209. 

  1210. static void mov_parse_stsd_audio(MOVContext *c, AVIOContext *pb,

  1211.                                  AVStream *st, MOVStreamContext *sc)

  1212. {

  1213.     int bits_per_sample, flags;

  1214.     uint16_t version = avio_rb16(pb);

  1215. 

  1216.     avio_rb16(pb); /* revision level */

  1217.     avio_rb32(pb); /* vendor */

  1218. 

  1219.     st->codec->channels              = avio_rb16(pb); /* channel count */

  1220.     st->codec->bits_per_coded_sample = avio_rb16(pb); /* sample size */

  1221.     av_dlog(c->fc, "audio channels %d\n", st->codec->channels);

  1222. 

  1223.     sc->audio_cid = avio_rb16(pb);

  1224.     avio_rb16(pb); /* packet size = 0 */

  1225. 

  1226.     st->codec->sample_rate = ((avio_rb32(pb) >> 16));

  1227. 

  1228.     // Read QT version 1 fields. In version 0 these do not exist.

  1229.     av_dlog(c->fc, "version =%d, isom =%d\n", version, c->isom);

  1230.     if (!c->isom) {

  1231.         if (version == 1) {

  1232.             sc->samples_per_frame = avio_rb32(pb);

  1233.             avio_rb32(pb); /* bytes per packet */

  1234.             sc->bytes_per_frame = avio_rb32(pb);

  1235.             avio_rb32(pb); /* bytes per sample */

  1236.         } else if (version == 2) {

  1237.             avio_rb32(pb); /* sizeof struct only */

  1238.             st->codec->sample_rate = av_int2double(avio_rb64(pb));

  1239.             st->codec->channels    = avio_rb32(pb);

  1240.             avio_rb32(pb); /* always 0x7F000000 */

  1241.             st->codec->bits_per_coded_sample = avio_rb32(pb);

  1242. 

  1243.             flags = avio_rb32(pb); /* lpcm format specific flag */

  1244.             sc->bytes_per_frame   = avio_rb32(pb);

  1245.             sc->samples_per_frame = avio_rb32(pb);

  1246.             if (st->codec->codec_tag == MKTAG('l','p','c','m'))

  1247.                 st->codec->codec_id =

  1248.                     ff_mov_get_lpcm_codec_id(st->codec->bits_per_coded_sample,

  1249.                                              flags);

  1250.         }

  1251.     }

  1252. 

  1253.     switch (st->codec->codec_id) {

  1254.     case AV_CODEC_ID_PCM_S8:

  1255.     case AV_CODEC_ID_PCM_U8:

  1256.         if (st->codec->bits_per_coded_sample == 16)

  1257.             st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;

  1258.         break;

  1259.     case AV_CODEC_ID_PCM_S16LE:

  1260.     case AV_CODEC_ID_PCM_S16BE:

  1261.         if (st->codec->bits_per_coded_sample == 8)

  1262.             st->codec->codec_id = AV_CODEC_ID_PCM_S8;

  1263.         else if (st->codec->bits_per_coded_sample == 24)

  1264.             st->codec->codec_id =

  1265.                 st->codec->codec_id == AV_CODEC_ID_PCM_S16BE ?

  1266.                 AV_CODEC_ID_PCM_S24BE : AV_CODEC_ID_PCM_S24LE;

  1267.         break;

  1268.     /* set values for old format before stsd version 1 appeared */

  1269.     case AV_CODEC_ID_MACE3:

  1270.         sc->samples_per_frame = 6;

  1271.         sc->bytes_per_frame   = 2 * st->codec->channels;

  1272.         break;

  1273.     case AV_CODEC_ID_MACE6:

  1274.         sc->samples_per_frame = 6;

  1275.         sc->bytes_per_frame   = 1 * st->codec->channels;

  1276.         break;

  1277.     case AV_CODEC_ID_ADPCM_IMA_QT:

  1278.         sc->samples_per_frame = 64;

  1279.         sc->bytes_per_frame   = 34 * st->codec->channels;

  1280.         break;

  1281.     case AV_CODEC_ID_GSM:

  1282.         sc->samples_per_frame = 160;

  1283.         sc->bytes_per_frame   = 33;

  1284.         break;

  1285.     default:

  1286.         break;

  1287.     }

  1288. 

  1289.     bits_per_sample = av_get_bits_per_sample(st->codec->codec_id);

  1290.     if (bits_per_sample) {

  1291.         st->codec->bits_per_coded_sample = bits_per_sample;

  1292.         sc->sample_size = (bits_per_sample >> 3) * st->codec->channels;

  1293.     }

  1294. }

  1295. 

  1296. static void mov_parse_stsd_subtitle(MOVContext *c, AVIOContext *pb,

  1297.                                     AVStream *st, MOVStreamContext *sc,

  1298.                                     int size)

  1299. {

  1300.     // ttxt stsd contains display flags, justification, background

  1301.     // color, fonts, and default styles, so fake an atom to read it

  1302.     MOVAtom fake_atom = { .size = size };

  1303.     // mp4s contains a regular esds atom

  1304.     if (st->codec->codec_tag != AV_RL32("mp4s"))

  1305.         mov_read_glbl(c, pb, fake_atom);

  1306.     st->codec->width  = sc->width;

  1307.     st->codec->height = sc->height;

  1308. }

  1309. 

  1310. static int mov_parse_stsd_data(MOVContext *c, AVIOContext *pb,

  1311.                                 AVStream *st, MOVStreamContext *sc,

  1312.                                 int size)

  1313. {

  1314.     if (st->codec->codec_tag == MKTAG('t','m','c','d')) {

  1315.         st->codec->extradata_size = size;

  1316.         st->codec->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);

  1317.         if (!st->codec->extradata)

  1318.             return AVERROR(ENOMEM);

  1319.         avio_read(pb, st->codec->extradata, size);

  1320.     } else {

  1321.         /* other codec type, just skip (rtp, mp4s ...) */

  1322.         avio_skip(pb, size);

  1323.     }

  1324.     return 0;

  1325. }

  1326. 

  1327. static int mov_finalize_stsd_codec(MOVContext *c, AVIOContext *pb,

  1328.                                    AVStream *st, MOVStreamContext *sc)

  1329. {

  1330.     if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&

  1331.         !st->codec->sample_rate && sc->time_scale > 1)

  1332.         st->codec->sample_rate = sc->time_scale;

  1333. 

  1334.     /* special codec parameters handling */

  1335.     switch (st->codec->codec_id) {

  1336. #if CONFIG_DV_DEMUXER

  1337.     case AV_CODEC_ID_DVAUDIO:

  1338.         c->dv_fctx  = avformat_alloc_context();

  1339.         c->dv_demux = avpriv_dv_init_demux(c->dv_fctx);

  1340.         if (!c->dv_demux) {

  1341.             av_log(c->fc, AV_LOG_ERROR, "dv demux context init error\n");

  1342.             return AVERROR(ENOMEM);

  1343.         }

  1344.         sc->dv_audio_container = 1;

  1345.         st->codec->codec_id    = AV_CODEC_ID_PCM_S16LE;

  1346.         break;

  1347. #endif

  1348.     /* no ifdef since parameters are always those */

  1349.     case AV_CODEC_ID_QCELP:

  1350.         st->codec->channels = 1;

  1351.         // force sample rate for qcelp when not stored in mov

  1352.         if (st->codec->codec_tag != MKTAG('Q','c','l','p'))

  1353.             st->codec->sample_rate = 8000;

  1354.         break;

  1355.     case AV_CODEC_ID_AMR_NB:

  1356.         st->codec->channels    = 1;

  1357.         /* force sample rate for amr, stsd in 3gp does not store sample rate */

  1358.         st->codec->sample_rate = 8000;

  1359.         break;

  1360.     case AV_CODEC_ID_AMR_WB:

  1361.         st->codec->channels    = 1;

  1362.         st->codec->sample_rate = 16000;

  1363.         break;

  1364.     case AV_CODEC_ID_MP2:

  1365.     case AV_CODEC_ID_MP3:

  1366.         /* force type after stsd for m1a hdlr */

  1367.         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

  1368.         st->need_parsing      = AVSTREAM_PARSE_FULL;

  1369.         break;

  1370.     case AV_CODEC_ID_GSM:

  1371.     case AV_CODEC_ID_ADPCM_MS:

  1372.     case AV_CODEC_ID_ADPCM_IMA_WAV:

  1373.     case AV_CODEC_ID_ILBC:

  1374.         st->codec->block_align = sc->bytes_per_frame;

  1375.         break;

  1376.     case AV_CODEC_ID_ALAC:

  1377.         if (st->codec->extradata_size == 36) {

  1378.             st->codec->channels    = AV_RB8 (st->codec->extradata + 21);

  1379.             st->codec->sample_rate = AV_RB32(st->codec->extradata + 32);

  1380.         }

  1381.         break;

  1382.     case AV_CODEC_ID_VC1:

  1383.         st->need_parsing = AVSTREAM_PARSE_FULL;

  1384.         break;

  1385.     default:

  1386.         break;

  1387.     }

  1388.     return 0;

  1389. }

  1390. 

  1391. static int mov_skip_multiple_stsd(MOVContext *c, AVIOContext *pb,

  1392.                                   int codec_tag, int format,

  1393.                                   int size)

  1394. {

  1395.     int video_codec_id = ff_codec_get_id(ff_codec_movvideo_tags, format);

  1396. 

  1397.     if (codec_tag &&

  1398.         (codec_tag == AV_RL32("avc1") ||

  1399.          (codec_tag != format &&

  1400.           (c->fc->video_codec_id ? video_codec_id != c->fc->video_codec_id

  1401.                                  : codec_tag != MKTAG('j','p','e','g'))))) {

  1402.         /* Multiple fourcc, we skip JPEG. This is not correct, we should

  1403.          * export it as a separate AVStream but this needs a few changes

  1404.          * in the MOV demuxer, patch welcome. */

  1405. 

  1406.         av_log(c->fc, AV_LOG_WARNING, "multiple fourcc not supported\n");

  1407.         avio_skip(pb, size);

  1408.         return 1;

  1409.     }

  1410. 

  1411.     return 0;

  1412. }

  1413. 

  1414. int ff_mov_read_stsd_entries(MOVContext *c, AVIOContext *pb, int entries)

  1415. {

  1416.     AVStream *st;

  1417.     MOVStreamContext *sc;

  1418.     int pseudo_stream_id;

  1419. 

  1420.     if (c->fc->nb_streams < 1)

  1421.         return 0;

  1422.     st = c->fc->streams[c->fc->nb_streams-1];

  1423.     sc = st->priv_data;

  1424. 

  1425.     for (pseudo_stream_id = 0;

  1426.          pseudo_stream_id < entries && !pb->eof_reached;

  1427.          pseudo_stream_id++) {

  1428.         //Parsing Sample description table

  1429.         enum AVCodecID id;

  1430.         int ret, dref_id = 1;

  1431.         MOVAtom a = { AV_RL32("stsd") };

  1432.         int64_t start_pos = avio_tell(pb);

  1433.         uint32_t size = avio_rb32(pb); /* size */

  1434.         uint32_t format = avio_rl32(pb); /* data format */

  1435. 

  1436.         if (size >= 16) {

  1437.             avio_rb32(pb); /* reserved */

  1438.             avio_rb16(pb); /* reserved */

  1439.             dref_id = avio_rb16(pb);

  1440.         } else {

  1441.             av_log(c->fc, AV_LOG_ERROR, "invalid size %d in stsd\n", size);

  1442.             return AVERROR_INVALIDDATA;

  1443.         }

  1444. 

  1445.         if (mov_skip_multiple_stsd(c, pb, st->codec->codec_tag, format,

  1446.                                    size - (avio_tell(pb) - start_pos)))

  1447.             continue;

  1448. 

  1449.         sc->pseudo_stream_id = st->codec->codec_tag ? -1 : pseudo_stream_id;

  1450.         sc->dref_id= dref_id;

  1451. 

  1452.         id = mov_codec_id(st, format);

  1453. 

  1454.         av_dlog(c->fc, "size=%d 4CC= %c%c%c%c codec_type=%d\n", size,

  1455.                 (format >> 0) & 0xff, (format >> 8) & 0xff, (format >> 16) & 0xff,

  1456.                 (format >> 24) & 0xff, st->codec->codec_type);

  1457. 

  1458.         if (st->codec->codec_type==AVMEDIA_TYPE_VIDEO) {

  1459.             st->codec->codec_id = id;

  1460.             mov_parse_stsd_video(c, pb, st, sc);

  1461.         } else if (st->codec->codec_type==AVMEDIA_TYPE_AUDIO) {

  1462.             st->codec->codec_id = id;

  1463.             mov_parse_stsd_audio(c, pb, st, sc);

  1464.         } else if (st->codec->codec_type==AVMEDIA_TYPE_SUBTITLE){

  1465.             st->codec->codec_id = id;

  1466.             mov_parse_stsd_subtitle(c, pb, st, sc,

  1467.                                     size - (avio_tell(pb) - start_pos));

  1468.         } else {

  1469.             ret = mov_parse_stsd_data(c, pb, st, sc,

  1470.                                       size - (avio_tell(pb) - start_pos));

  1471.             if (ret < 0)

  1472.                 return ret;

  1473.         }

  1474.         /* this will read extra atoms at the end (wave, alac, damr, avcC, SMI ...) */

  1475.         a.size = size - (avio_tell(pb) - start_pos);

  1476.         if (a.size > 8) {

  1477.             if ((ret = mov_read_default(c, pb, a)) < 0)

  1478.                 return ret;

  1479.         } else if (a.size > 0)

  1480.             avio_skip(pb, a.size);

  1481.     }

  1482. 

  1483.     if (pb->eof_reached)

  1484.         return AVERROR_EOF;

  1485. 

  1486.     return mov_finalize_stsd_codec(c, pb, st, sc);

  1487. }

  1488. 

  1489. static int mov_read_stsd(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1490. {

  1491.     int entries;

  1492. 

  1493.     avio_r8(pb); /* version */

  1494.     avio_rb24(pb); /* flags */

  1495.     entries = avio_rb32(pb);

  1496. 

  1497.     return ff_mov_read_stsd_entries(c, pb, entries);

  1498. }

  1499. 

  1500. static int mov_read_stsc(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1501. {

  1502.     AVStream *st;

  1503.     MOVStreamContext *sc;

  1504.     unsigned int i, entries;

  1505. 

  1506.     if (c->fc->nb_streams < 1)

  1507.         return 0;

  1508.     st = c->fc->streams[c->fc->nb_streams-1];

  1509.     sc = st->priv_data;

  1510. 

  1511.     avio_r8(pb); /* version */

  1512.     avio_rb24(pb); /* flags */

  1513. 

  1514.     entries = avio_rb32(pb);

  1515. 

  1516.     av_dlog(c->fc, "track[%i].stsc.entries = %i\n", c->fc->nb_streams-1, entries);

  1517. 

  1518.     if (!entries)

  1519.         return 0;

  1520.     if (entries >= UINT_MAX / sizeof(*sc->stsc_data))

  1521.         return AVERROR_INVALIDDATA;

  1522.     sc->stsc_data = av_malloc(entries * sizeof(*sc->stsc_data));

  1523.     if (!sc->stsc_data)

  1524.         return AVERROR(ENOMEM);

  1525. 

  1526.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1527.         sc->stsc_data[i].first = avio_rb32(pb);

  1528.         sc->stsc_data[i].count = avio_rb32(pb);

  1529.         sc->stsc_data[i].id = avio_rb32(pb);

  1530.     }

  1531. 

  1532.     sc->stsc_count = i;

  1533. 

  1534.     if (pb->eof_reached)

  1535.         return AVERROR_EOF;

  1536. 

  1537.     return 0;

  1538. }

  1539. 

  1540. static int mov_read_stps(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1541. {

  1542.     AVStream *st;

  1543.     MOVStreamContext *sc;

  1544.     unsigned i, entries;

  1545. 

  1546.     if (c->fc->nb_streams < 1)

  1547.         return 0;

  1548.     st = c->fc->streams[c->fc->nb_streams-1];

  1549.     sc = st->priv_data;

  1550. 

  1551.     avio_rb32(pb); // version + flags

  1552. 

  1553.     entries = avio_rb32(pb);

  1554.     if (entries >= UINT_MAX / sizeof(*sc->stps_data))

  1555.         return AVERROR_INVALIDDATA;

  1556.     sc->stps_data = av_malloc(entries * sizeof(*sc->stps_data));

  1557.     if (!sc->stps_data)

  1558.         return AVERROR(ENOMEM);

  1559. 

  1560.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1561.         sc->stps_data[i] = avio_rb32(pb);

  1562.         //av_dlog(c->fc, "stps %d\n", sc->stps_data[i]);

  1563.     }

  1564. 

  1565.     sc->stps_count = i;

  1566. 

  1567.     if (pb->eof_reached)

  1568.         return AVERROR_EOF;

  1569. 

  1570.     return 0;

  1571. }

  1572. 

  1573. static int mov_read_stss(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1574. {

  1575.     AVStream *st;

  1576.     MOVStreamContext *sc;

  1577.     unsigned int i, entries;

  1578. 

  1579.     if (c->fc->nb_streams < 1)

  1580.         return 0;

  1581.     st = c->fc->streams[c->fc->nb_streams-1];

  1582.     sc = st->priv_data;

  1583. 

  1584.     avio_r8(pb); /* version */

  1585.     avio_rb24(pb); /* flags */

  1586. 

  1587.     entries = avio_rb32(pb);

  1588. 

  1589.     av_dlog(c->fc, "keyframe_count = %d\n", entries);

  1590. 

  1591.     if (!entries)

  1592.     {

  1593.         sc->keyframe_absent = 1;

  1594.         return 0;

  1595.     }

  1596.     if (entries >= UINT_MAX / sizeof(int))

  1597.         return AVERROR_INVALIDDATA;

  1598.     sc->keyframes = av_malloc(entries * sizeof(int));

  1599.     if (!sc->keyframes)

  1600.         return AVERROR(ENOMEM);

  1601. 

  1602.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1603.         sc->keyframes[i] = avio_rb32(pb);

  1604.         //av_dlog(c->fc, "keyframes[]=%d\n", sc->keyframes[i]);

  1605.     }

  1606. 

  1607.     sc->keyframe_count = i;

  1608. 

  1609.     if (pb->eof_reached)

  1610.         return AVERROR_EOF;

  1611. 

  1612.     return 0;

  1613. }

  1614. 

  1615. static int mov_read_stsz(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1616. {

  1617.     AVStream *st;

  1618.     MOVStreamContext *sc;

  1619.     unsigned int i, entries, sample_size, field_size, num_bytes;

  1620.     GetBitContext gb;

  1621.     unsigned char* buf;

  1622. 

  1623.     if (c->fc->nb_streams < 1)

  1624.         return 0;

  1625.     st = c->fc->streams[c->fc->nb_streams-1];

  1626.     sc = st->priv_data;

  1627. 

  1628.     avio_r8(pb); /* version */

  1629.     avio_rb24(pb); /* flags */

  1630. 

  1631.     if (atom.type == MKTAG('s','t','s','z')) {

  1632.         sample_size = avio_rb32(pb);

  1633.         if (!sc->sample_size) /* do not overwrite value computed in stsd */

  1634.             sc->sample_size = sample_size;

  1635.         field_size = 32;

  1636.     } else {

  1637.         sample_size = 0;

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

  1639.         field_size = avio_r8(pb);

  1640.     }

  1641.     entries = avio_rb32(pb);

  1642. 

  1643.     av_dlog(c->fc, "sample_size = %d sample_count = %d\n", sc->sample_size, entries);

  1644. 

  1645.     sc->sample_count = entries;

  1646.     if (sample_size)

  1647.         return 0;

  1648. 

  1649.     if (field_size != 4 && field_size != 8 && field_size != 16 && field_size != 32) {

  1650.         av_log(c->fc, AV_LOG_ERROR, "Invalid sample field size %d\n", field_size);

  1651.         return AVERROR_INVALIDDATA;

  1652.     }

  1653. 

  1654.     if (!entries)

  1655.         return 0;

  1656.     if (entries >= UINT_MAX / sizeof(int) || entries >= (UINT_MAX - 4) / field_size)

  1657.         return AVERROR_INVALIDDATA;

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

  1659.     if (!sc->sample_sizes)

  1660.         return AVERROR(ENOMEM);

  1661. 

  1662.     num_bytes = (entries*field_size+4)>>3;

  1663. 

  1664.     buf = av_malloc(num_bytes+FF_INPUT_BUFFER_PADDING_SIZE);

  1665.     if (!buf) {

  1666.         av_freep(&sc->sample_sizes);

  1667.         return AVERROR(ENOMEM);

  1668.     }

  1669. 

  1670.     if (avio_read(pb, buf, num_bytes) < num_bytes) {

  1671.         av_freep(&sc->sample_sizes);

  1672.         av_free(buf);

  1673.         return AVERROR_INVALIDDATA;

  1674.     }

  1675. 

  1676.     init_get_bits(&gb, buf, 8*num_bytes);

  1677. 

  1678.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1679.         sc->sample_sizes[i] = get_bits_long(&gb, field_size);

  1680.         sc->data_size += sc->sample_sizes[i];

  1681.     }

  1682. 

  1683.     sc->sample_count = i;

  1684. 

  1685.     if (pb->eof_reached)

  1686.         return AVERROR_EOF;

  1687. 

  1688.     av_free(buf);

  1689.     return 0;

  1690. }

  1691. 

  1692. static int mov_read_stts(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1693. {

  1694.     AVStream *st;

  1695.     MOVStreamContext *sc;

  1696.     unsigned int i, entries;

  1697.     int64_t duration=0;

  1698.     int64_t total_sample_count=0;

  1699. 

  1700.     if (c->fc->nb_streams < 1)

  1701.         return 0;

  1702.     st = c->fc->streams[c->fc->nb_streams-1];

  1703.     sc = st->priv_data;

  1704. 

  1705.     avio_r8(pb); /* version */

  1706.     avio_rb24(pb); /* flags */

  1707.     entries = avio_rb32(pb);

  1708. 

  1709.     av_dlog(c->fc, "track[%i].stts.entries = %i\n",

  1710.             c->fc->nb_streams-1, entries);

  1711. 

  1712.     if (!entries)

  1713.         return 0;

  1714.     if (entries >= UINT_MAX / sizeof(*sc->stts_data))

  1715.         return AVERROR(EINVAL);

  1716. 

  1717.     sc->stts_data = av_malloc(entries * sizeof(*sc->stts_data));

  1718.     if (!sc->stts_data)

  1719.         return AVERROR(ENOMEM);

  1720. 

  1721.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1722.         int sample_duration;

  1723.         int sample_count;

  1724. 

  1725.         sample_count=avio_rb32(pb);

  1726.         sample_duration = avio_rb32(pb);

  1727.         if (sample_count < 0) {

  1728.             av_log(c->fc, AV_LOG_ERROR, "Invalid sample_count=%d\n", sample_count);

  1729.             return AVERROR_INVALIDDATA;

  1730.         }

  1731.         sc->stts_data[i].count= sample_count;

  1732.         sc->stts_data[i].duration= sample_duration;

  1733. 

  1734.         av_dlog(c->fc, "sample_count=%d, sample_duration=%d\n",

  1735.                 sample_count, sample_duration);

  1736. 

  1737.         duration+=(int64_t)sample_duration*sample_count;

  1738.         total_sample_count+=sample_count;

  1739.     }

  1740. 

  1741.     sc->stts_count = i;

  1742. 

  1743.     if (pb->eof_reached)

  1744.         return AVERROR_EOF;

  1745. 

  1746.     st->nb_frames= total_sample_count;

  1747.     if (duration)

  1748.         st->duration= duration;

  1749.     sc->track_end = duration;

  1750.     return 0;

  1751. }

  1752. 

  1753. static int mov_read_ctts(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1754. {

  1755.     AVStream *st;

  1756.     MOVStreamContext *sc;

  1757.     unsigned int i, entries;

  1758. 

  1759.     if (c->fc->nb_streams < 1)

  1760.         return 0;

  1761.     st = c->fc->streams[c->fc->nb_streams-1];

  1762.     sc = st->priv_data;

  1763. 

  1764.     avio_r8(pb); /* version */

  1765.     avio_rb24(pb); /* flags */

  1766.     entries = avio_rb32(pb);

  1767. 

  1768.     av_dlog(c->fc, "track[%i].ctts.entries = %i\n", c->fc->nb_streams-1, entries);

  1769. 

  1770.     if (!entries)

  1771.         return 0;

  1772.     if (entries >= UINT_MAX / sizeof(*sc->ctts_data))

  1773.         return AVERROR_INVALIDDATA;

  1774.     sc->ctts_data = av_malloc(entries * sizeof(*sc->ctts_data));

  1775.     if (!sc->ctts_data)

  1776.         return AVERROR(ENOMEM);

  1777. 

  1778.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1779.         int count    =avio_rb32(pb);

  1780.         int duration =avio_rb32(pb);

  1781. 

  1782.         sc->ctts_data[i].count   = count;

  1783.         sc->ctts_data[i].duration= duration;

  1784.         if (duration < 0)

  1785.             sc->dts_shift = FFMAX(sc->dts_shift, -duration);

  1786.     }

  1787. 

  1788.     sc->ctts_count = i;

  1789. 

  1790.     if (pb->eof_reached)

  1791.         return AVERROR_EOF;

  1792. 

  1793.     av_dlog(c->fc, "dts shift %d\n", sc->dts_shift);

  1794. 

  1795.     return 0;

  1796. }

  1797. 

  1798. static int mov_read_sbgp(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  1799. {

  1800.     AVStream *st;

  1801.     MOVStreamContext *sc;

  1802.     unsigned int i, entries;

  1803.     uint8_t version;

  1804.     uint32_t grouping_type;

  1805. 

  1806.     if (c->fc->nb_streams < 1)

  1807.         return 0;

  1808.     st = c->fc->streams[c->fc->nb_streams-1];

  1809.     sc = st->priv_data;

  1810. 

  1811.     version = avio_r8(pb); /* version */

  1812.     avio_rb24(pb); /* flags */

  1813.     grouping_type = avio_rl32(pb);

  1814.     if (grouping_type != MKTAG( 'r','a','p',' '))

  1815.         return 0; /* only support 'rap ' grouping */

  1816.     if (version == 1)

  1817.         avio_rb32(pb); /* grouping_type_parameter */

  1818. 

  1819.     entries = avio_rb32(pb);

  1820.     if (!entries)

  1821.         return 0;

  1822.     if (entries >= UINT_MAX / sizeof(*sc->rap_group))

  1823.         return AVERROR_INVALIDDATA;

  1824.     sc->rap_group = av_malloc(entries * sizeof(*sc->rap_group));

  1825.     if (!sc->rap_group)

  1826.         return AVERROR(ENOMEM);

  1827. 

  1828.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  1829.         sc->rap_group[i].count = avio_rb32(pb); /* sample_count */

  1830.         sc->rap_group[i].index = avio_rb32(pb); /* group_description_index */

  1831.     }

  1832. 

  1833.     sc->rap_group_count = i;

  1834. 

  1835.     return pb->eof_reached ? AVERROR_EOF : 0;

  1836. }

  1837. 

  1838. static void mov_build_index(MOVContext *mov, AVStream *st)

  1839. {

  1840.     MOVStreamContext *sc = st->priv_data;

  1841.     int64_t current_offset;

  1842.     int64_t current_dts = 0;

  1843.     unsigned int stts_index = 0;

  1844.     unsigned int stsc_index = 0;

  1845.     unsigned int stss_index = 0;

  1846.     unsigned int stps_index = 0;

  1847.     unsigned int i, j;

  1848.     uint64_t stream_size = 0;

  1849. 

  1850.     /* adjust first dts according to edit list */

  1851.     if (sc->time_offset && mov->time_scale > 0) {

  1852.         if (sc->time_offset < 0)

  1853.             sc->time_offset = av_rescale(sc->time_offset, sc->time_scale, mov->time_scale);

  1854.         current_dts = -sc->time_offset;

  1855.         if (sc->ctts_data && sc->stts_data && sc->stts_data[0].duration &&

  1856.             sc->ctts_data[0].duration / sc->stts_data[0].duration > 16) {

  1857.             /* more than 16 frames delay, dts are likely wrong

  1858.                this happens with files created by iMovie */

  1859.             sc->wrong_dts = 1;

  1860.             st->codec->has_b_frames = 1;

  1861.         }

  1862.     }

  1863. 

  1864.     /* only use old uncompressed audio chunk demuxing when stts specifies it */

  1865.     if (!(st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&

  1866.           sc->stts_count == 1 && sc->stts_data[0].duration == 1)) {

  1867.         unsigned int current_sample = 0;

  1868.         unsigned int stts_sample = 0;

  1869.         unsigned int sample_size;

  1870.         unsigned int distance = 0;

  1871.         unsigned int rap_group_index = 0;

  1872.         unsigned int rap_group_sample = 0;

  1873.         int rap_group_present = sc->rap_group_count && sc->rap_group;

  1874.         int key_off = (sc->keyframes && sc->keyframes[0] > 0) || (sc->stps_data && sc->stps_data[0] > 0);

  1875. 

  1876.         current_dts -= sc->dts_shift;

  1877. 

  1878.         if (!sc->sample_count)

  1879.             return;

  1880.         if (sc->sample_count >= UINT_MAX / sizeof(*st->index_entries) - st->nb_index_entries)

  1881.             return;

  1882.         if (av_reallocp_array(&st->index_entries,

  1883.                               st->nb_index_entries + sc->sample_count,

  1884.                               sizeof(*st->index_entries)) < 0) {

  1885.             st->nb_index_entries = 0;

  1886.             return;

  1887.         }

  1888.         st->index_entries_allocated_size = (st->nb_index_entries + sc->sample_count) * sizeof(*st->index_entries);

  1889. 

  1890.         for (i = 0; i < sc->chunk_count; i++) {

  1891.             current_offset = sc->chunk_offsets[i];

  1892.             while (stsc_index + 1 < sc->stsc_count &&

  1893.                 i + 1 == sc->stsc_data[stsc_index + 1].first)

  1894.                 stsc_index++;

  1895.             for (j = 0; j < sc->stsc_data[stsc_index].count; j++) {

  1896.                 int keyframe = 0;

  1897.                 if (current_sample >= sc->sample_count) {

  1898.                     av_log(mov->fc, AV_LOG_ERROR, "wrong sample count\n");

  1899.                     return;

  1900.                 }

  1901. 

  1902.                 if (!sc->keyframe_absent && (!sc->keyframe_count || current_sample+key_off == sc->keyframes[stss_index])) {

  1903.                     keyframe = 1;

  1904.                     if (stss_index + 1 < sc->keyframe_count)

  1905.                         stss_index++;

  1906.                 } else if (sc->stps_count && current_sample+key_off == sc->stps_data[stps_index]) {

  1907.                     keyframe = 1;

  1908.                     if (stps_index + 1 < sc->stps_count)

  1909.                         stps_index++;

  1910.                 }

  1911.                 if (rap_group_present && rap_group_index < sc->rap_group_count) {

  1912.                     if (sc->rap_group[rap_group_index].index > 0)

  1913.                         keyframe = 1;

  1914.                     if (++rap_group_sample == sc->rap_group[rap_group_index].count) {

  1915.                         rap_group_sample = 0;

  1916.                         rap_group_index++;

  1917.                     }

  1918.                 }

  1919.                 if (keyframe)

  1920.                     distance = 0;

  1921.                 sample_size = sc->sample_size > 0 ? sc->sample_size : sc->sample_sizes[current_sample];

  1922.                 if (sc->pseudo_stream_id == -1 ||

  1923.                    sc->stsc_data[stsc_index].id - 1 == sc->pseudo_stream_id) {

  1924.                     AVIndexEntry *e = &st->index_entries[st->nb_index_entries++];

  1925.                     e->pos = current_offset;

  1926.                     e->timestamp = current_dts;

  1927.                     e->size = sample_size;

  1928.                     e->min_distance = distance;

  1929.                     e->flags = keyframe ? AVINDEX_KEYFRAME : 0;

  1930.                     av_dlog(mov->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "

  1931.                             "size %d, distance %d, keyframe %d\n", st->index, current_sample,

  1932.                             current_offset, current_dts, sample_size, distance, keyframe);

  1933.                 }

  1934. 

  1935.                 current_offset += sample_size;

  1936.                 stream_size += sample_size;

  1937.                 current_dts += sc->stts_data[stts_index].duration;

  1938.                 distance++;

  1939.                 stts_sample++;

  1940.                 current_sample++;

  1941.                 if (stts_index + 1 < sc->stts_count && stts_sample == sc->stts_data[stts_index].count) {

  1942.                     stts_sample = 0;

  1943.                     stts_index++;

  1944.                 }

  1945.             }

  1946.         }

  1947.         if (st->duration > 0)

  1948.             st->codec->bit_rate = stream_size*8*sc->time_scale/st->duration;

  1949.     } else {

  1950.         unsigned chunk_samples, total = 0;

  1951. 

  1952.         // compute total chunk count

  1953.         for (i = 0; i < sc->stsc_count; i++) {

  1954.             unsigned count, chunk_count;

  1955. 

  1956.             chunk_samples = sc->stsc_data[i].count;

  1957.             if (i != sc->stsc_count - 1 &&

  1958.                 sc->samples_per_frame && chunk_samples % sc->samples_per_frame) {

  1959.                 av_log(mov->fc, AV_LOG_ERROR, "error unaligned chunk\n");

  1960.                 return;

  1961.             }

  1962. 

  1963.             if (sc->samples_per_frame >= 160) { // gsm

  1964.                 count = chunk_samples / sc->samples_per_frame;

  1965.             } else if (sc->samples_per_frame > 1) {

  1966.                 unsigned samples = (1024/sc->samples_per_frame)*sc->samples_per_frame;

  1967.                 count = (chunk_samples+samples-1) / samples;

  1968.             } else {

  1969.                 count = (chunk_samples+1023) / 1024;

  1970.             }

  1971. 

  1972.             if (i < sc->stsc_count - 1)

  1973.                 chunk_count = sc->stsc_data[i+1].first - sc->stsc_data[i].first;

  1974.             else

  1975.                 chunk_count = sc->chunk_count - (sc->stsc_data[i].first - 1);

  1976.             total += chunk_count * count;

  1977.         }

  1978. 

  1979.         av_dlog(mov->fc, "chunk count %d\n", total);

  1980.         if (total >= UINT_MAX / sizeof(*st->index_entries) - st->nb_index_entries)

  1981.             return;

  1982.         if (av_reallocp_array(&st->index_entries,

  1983.                               st->nb_index_entries + total,

  1984.                               sizeof(*st->index_entries)) < 0) {

  1985.             st->nb_index_entries = 0;

  1986.             return;

  1987.         }

  1988.         st->index_entries_allocated_size = (st->nb_index_entries + total) * sizeof(*st->index_entries);

  1989. 

  1990.         // populate index

  1991.         for (i = 0; i < sc->chunk_count; i++) {

  1992.             current_offset = sc->chunk_offsets[i];

  1993.             if (stsc_index + 1 < sc->stsc_count &&

  1994.                 i + 1 == sc->stsc_data[stsc_index + 1].first)

  1995.                 stsc_index++;

  1996.             chunk_samples = sc->stsc_data[stsc_index].count;

  1997. 

  1998.             while (chunk_samples > 0) {

  1999.                 AVIndexEntry *e;

  2000.                 unsigned size, samples;

  2001. 

  2002.                 if (sc->samples_per_frame >= 160) { // gsm

  2003.                     samples = sc->samples_per_frame;

  2004.                     size = sc->bytes_per_frame;

  2005.                 } else {

  2006.                     if (sc->samples_per_frame > 1) {

  2007.                         samples = FFMIN((1024 / sc->samples_per_frame)*

  2008.                                         sc->samples_per_frame, chunk_samples);

  2009.                         size = (samples / sc->samples_per_frame) * sc->bytes_per_frame;

  2010.                     } else {

  2011.                         samples = FFMIN(1024, chunk_samples);

  2012.                         size = samples * sc->sample_size;

  2013.                     }

  2014.                 }

  2015. 

  2016.                 if (st->nb_index_entries >= total) {

  2017.                     av_log(mov->fc, AV_LOG_ERROR, "wrong chunk count %d\n", total);

  2018.                     return;

  2019.                 }

  2020.                 e = &st->index_entries[st->nb_index_entries++];

  2021.                 e->pos = current_offset;

  2022.                 e->timestamp = current_dts;

  2023.                 e->size = size;

  2024.                 e->min_distance = 0;

  2025.                 e->flags = AVINDEX_KEYFRAME;

  2026.                 av_dlog(mov->fc, "AVIndex stream %d, chunk %d, offset %"PRIx64", dts %"PRId64", "

  2027.                         "size %d, duration %d\n", st->index, i, current_offset, current_dts,

  2028.                         size, samples);

  2029. 

  2030.                 current_offset += size;

  2031.                 current_dts += samples;

  2032.                 chunk_samples -= samples;

  2033.             }

  2034.         }

  2035.     }

  2036. }

  2037. 

  2038. static int mov_open_dref(AVIOContext **pb, char *src, MOVDref *ref,

  2039.                          AVIOInterruptCB *int_cb)

  2040. {

  2041.     /* try relative path, we do not try the absolute because it can leak information about our

  2042.        system to an attacker */

  2043.     if (ref->nlvl_to > 0 && ref->nlvl_from > 0) {

  2044.         char filename[1024];

  2045.         char *src_path;

  2046.         int i, l;

  2047. 

  2048.         /* find a source dir */

  2049.         src_path = strrchr(src, '/');

  2050.         if (src_path)

  2051.             src_path++;

  2052.         else

  2053.             src_path = src;

  2054. 

  2055.         /* find a next level down to target */

  2056.         for (i = 0, l = strlen(ref->path) - 1; l >= 0; l--)

  2057.             if (ref->path[l] == '/') {

  2058.                 if (i == ref->nlvl_to - 1)

  2059.                     break;

  2060.                 else

  2061.                     i++;

  2062.             }

  2063. 

  2064.         /* compose filename if next level down to target was found */

  2065.         if (i == ref->nlvl_to - 1 && src_path - src  < sizeof(filename)) {

  2066.             memcpy(filename, src, src_path - src);

  2067.             filename[src_path - src] = 0;

  2068. 

  2069.             for (i = 1; i < ref->nlvl_from; i++)

  2070.                 av_strlcat(filename, "../", 1024);

  2071. 

  2072.             av_strlcat(filename, ref->path + l + 1, 1024);

  2073. 

  2074.             if (!avio_open2(pb, filename, AVIO_FLAG_READ, int_cb, NULL))

  2075.                 return 0;

  2076.         }

  2077.     }

  2078. 

  2079.     return AVERROR(ENOENT);

  2080. }

  2081. 

  2082. static int mov_read_trak(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2083. {

  2084.     AVStream *st;

  2085.     MOVStreamContext *sc;

  2086.     int ret;

  2087. 

  2088.     st = avformat_new_stream(c->fc, NULL);

  2089.     if (!st) return AVERROR(ENOMEM);

  2090.     st->id = c->fc->nb_streams;

  2091.     sc = av_mallocz(sizeof(MOVStreamContext));

  2092.     if (!sc) return AVERROR(ENOMEM);

  2093. 

  2094.     st->priv_data = sc;

  2095.     st->codec->codec_type = AVMEDIA_TYPE_DATA;

  2096.     sc->ffindex = st->index;

  2097. 

  2098.     if ((ret = mov_read_default(c, pb, atom)) < 0)

  2099.         return ret;

  2100. 

  2101.     /* sanity checks */

  2102.     if (sc->chunk_count && (!sc->stts_count || !sc->stsc_count ||

  2103.                             (!sc->sample_size && !sc->sample_count))) {

  2104.         av_log(c->fc, AV_LOG_ERROR, "stream %d, missing mandatory atoms, broken header\n",

  2105.                st->index);

  2106.         return 0;

  2107.     }

  2108. 

  2109.     if (sc->time_scale <= 0) {

  2110.         av_log(c->fc, AV_LOG_WARNING, "stream %d, timescale not set\n", st->index);

  2111.         sc->time_scale = c->time_scale;

  2112.         if (sc->time_scale <= 0)

  2113.             sc->time_scale = 1;

  2114.     }

  2115. 

  2116.     avpriv_set_pts_info(st, 64, 1, sc->time_scale);

  2117. 

  2118.     mov_build_index(c, st);

  2119. 

  2120.     if (sc->dref_id-1 < sc->drefs_count && sc->drefs[sc->dref_id-1].path) {

  2121.         MOVDref *dref = &sc->drefs[sc->dref_id - 1];

  2122.         if (mov_open_dref(&sc->pb, c->fc->filename, dref, &c->fc->interrupt_callback) < 0)

  2123.             av_log(c->fc, AV_LOG_ERROR,

  2124.                    "stream %d, error opening alias: path='%s', dir='%s', "

  2125.                    "filename='%s', volume='%s', nlvl_from=%d, nlvl_to=%d\n",

  2126.                    st->index, dref->path, dref->dir, dref->filename,

  2127.                    dref->volume, dref->nlvl_from, dref->nlvl_to);

  2128.     } else

  2129.         sc->pb = c->fc->pb;

  2130. 

  2131.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  2132.         if (!st->sample_aspect_ratio.num &&

  2133.             (st->codec->width != sc->width || st->codec->height != sc->height)) {

  2134.             st->sample_aspect_ratio = av_d2q(((double)st->codec->height * sc->width) /

  2135.                                              ((double)st->codec->width * sc->height), INT_MAX);

  2136.         }

  2137. 

  2138.         if (st->duration != AV_NOPTS_VALUE && st->duration > 0)

  2139.             av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,

  2140.                       sc->time_scale*st->nb_frames, st->duration, INT_MAX);

  2141.     }

  2142. 

  2143.     switch (st->codec->codec_id) {

  2144. #if CONFIG_H261_DECODER

  2145.     case AV_CODEC_ID_H261:

  2146. #endif

  2147. #if CONFIG_H263_DECODER

  2148.     case AV_CODEC_ID_H263:

  2149. #endif

  2150. #if CONFIG_MPEG4_DECODER

  2151.     case AV_CODEC_ID_MPEG4:

  2152. #endif

  2153.         st->codec->width = 0; /* let decoder init width/height */

  2154.         st->codec->height= 0;

  2155.         break;

  2156.     }

  2157. 

  2158.     /* Do not need those anymore. */

  2159.     av_freep(&sc->chunk_offsets);

  2160.     av_freep(&sc->stsc_data);

  2161.     av_freep(&sc->sample_sizes);

  2162.     av_freep(&sc->keyframes);

  2163.     av_freep(&sc->stts_data);

  2164.     av_freep(&sc->stps_data);

  2165.     av_freep(&sc->rap_group);

  2166. 

  2167.     return 0;

  2168. }

  2169. 

  2170. static int mov_read_ilst(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2171. {

  2172.     int ret;

  2173.     c->itunes_metadata = 1;

  2174.     ret = mov_read_default(c, pb, atom);

  2175.     c->itunes_metadata = 0;

  2176.     return ret;

  2177. }

  2178. 

  2179. static int mov_read_meta(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2180. {

  2181.     while (atom.size > 8) {

  2182.         uint32_t tag = avio_rl32(pb);

  2183.         atom.size -= 4;

  2184.         if (tag == MKTAG('h','d','l','r')) {

  2185.             avio_seek(pb, -8, SEEK_CUR);

  2186.             atom.size += 8;

  2187.             return mov_read_default(c, pb, atom);

  2188.         }

  2189.     }

  2190.     return 0;

  2191. }

  2192. 

  2193. static int mov_read_tkhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2194. {

  2195.     int i;

  2196.     int width;

  2197.     int height;

  2198.     int64_t disp_transform[2];

  2199.     int display_matrix[3][2];

  2200.     AVStream *st;

  2201.     MOVStreamContext *sc;

  2202.     int version;

  2203.     int flags;

  2204. 

  2205.     if (c->fc->nb_streams < 1)

  2206.         return 0;

  2207.     st = c->fc->streams[c->fc->nb_streams-1];

  2208.     sc = st->priv_data;

  2209. 

  2210.     version = avio_r8(pb);

  2211.     flags = avio_rb24(pb);

  2212.     st->disposition |= (flags & MOV_TKHD_FLAG_ENABLED) ? AV_DISPOSITION_DEFAULT : 0;

  2213. 

  2214.     if (version == 1) {

  2215.         avio_rb64(pb);

  2216.         avio_rb64(pb);

  2217.     } else {

  2218.         avio_rb32(pb); /* creation time */

  2219.         avio_rb32(pb); /* modification time */

  2220.     }

  2221.     st->id = (int)avio_rb32(pb); /* track id (NOT 0 !)*/

  2222.     avio_rb32(pb); /* reserved */

  2223. 

  2224.     /* highlevel (considering edits) duration in movie timebase */

  2225.     (version == 1) ? avio_rb64(pb) : avio_rb32(pb);

  2226.     avio_rb32(pb); /* reserved */

  2227.     avio_rb32(pb); /* reserved */

  2228. 

  2229.     avio_rb16(pb); /* layer */

  2230.     avio_rb16(pb); /* alternate group */

  2231.     avio_rb16(pb); /* volume */

  2232.     avio_rb16(pb); /* reserved */

  2233. 

  2234.     //read in the display matrix (outlined in ISO 14496-12, Section 6.2.2)

  2235.     // they're kept in fixed point format through all calculations

  2236.     // ignore u,v,z b/c we don't need the scale factor to calc aspect ratio

  2237.     for (i = 0; i < 3; i++) {

  2238.         display_matrix[i][0] = avio_rb32(pb);   // 16.16 fixed point

  2239.         display_matrix[i][1] = avio_rb32(pb);   // 16.16 fixed point

  2240.         avio_rb32(pb);           // 2.30 fixed point (not used)

  2241.     }

  2242. 

  2243.     width = avio_rb32(pb);       // 16.16 fixed point track width

  2244.     height = avio_rb32(pb);      // 16.16 fixed point track height

  2245.     sc->width = width >> 16;

  2246.     sc->height = height >> 16;

  2247. 

  2248.     // transform the display width/height according to the matrix

  2249.     // skip this if the display matrix is the default identity matrix

  2250.     // or if it is rotating the picture, ex iPhone 3GS

  2251.     // to keep the same scale, use [width height 1<<16]

  2252.     if (width && height &&

  2253.         ((display_matrix[0][0] != 65536  ||

  2254.           display_matrix[1][1] != 65536) &&

  2255.          !display_matrix[0][1] &&

  2256.          !display_matrix[1][0] &&

  2257.          !display_matrix[2][0] && !display_matrix[2][1])) {

  2258.         for (i = 0; i < 2; i++)

  2259.             disp_transform[i] =

  2260.                 (int64_t)  width  * display_matrix[0][i] +

  2261.                 (int64_t)  height * display_matrix[1][i] +

  2262.                 ((int64_t) display_matrix[2][i] << 16);

  2263. 

  2264.         //sample aspect ratio is new width/height divided by old width/height

  2265.         st->sample_aspect_ratio = av_d2q(

  2266.             ((double) disp_transform[0] * height) /

  2267.             ((double) disp_transform[1] * width), INT_MAX);

  2268.     }

  2269.     return 0;

  2270. }

  2271. 

  2272. static int mov_read_tfhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2273. {

  2274.     MOVFragment *frag = &c->fragment;

  2275.     MOVTrackExt *trex = NULL;

  2276.     int flags, track_id, i;

  2277. 

  2278.     avio_r8(pb); /* version */

  2279.     flags = avio_rb24(pb);

  2280. 

  2281.     track_id = avio_rb32(pb);

  2282.     if (!track_id)

  2283.         return AVERROR_INVALIDDATA;

  2284.     frag->track_id = track_id;

  2285.     for (i = 0; i < c->trex_count; i++)

  2286.         if (c->trex_data[i].track_id == frag->track_id) {

  2287.             trex = &c->trex_data[i];

  2288.             break;

  2289.         }

  2290.     if (!trex) {

  2291.         av_log(c->fc, AV_LOG_ERROR, "could not find corresponding trex\n");

  2292.         return AVERROR_INVALIDDATA;

  2293.     }

  2294. 

  2295.     frag->base_data_offset = flags & MOV_TFHD_BASE_DATA_OFFSET ?

  2296.                              avio_rb64(pb) : frag->moof_offset;

  2297.     frag->stsd_id  = flags & MOV_TFHD_STSD_ID ? avio_rb32(pb) : trex->stsd_id;

  2298. 

  2299.     frag->duration = flags & MOV_TFHD_DEFAULT_DURATION ?

  2300.                      avio_rb32(pb) : trex->duration;

  2301.     frag->size     = flags & MOV_TFHD_DEFAULT_SIZE ?

  2302.                      avio_rb32(pb) : trex->size;

  2303.     frag->flags    = flags & MOV_TFHD_DEFAULT_FLAGS ?

  2304.                      avio_rb32(pb) : trex->flags;

  2305.     av_dlog(c->fc, "frag flags 0x%x\n", frag->flags);

  2306.     return 0;

  2307. }

  2308. 

  2309. static int mov_read_chap(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2310. {

  2311.     c->chapter_track = avio_rb32(pb);

  2312.     return 0;

  2313. }

  2314. 

  2315. static int mov_read_trex(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2316. {

  2317.     MOVTrackExt *trex;

  2318.     int err;

  2319. 

  2320.     if ((uint64_t)c->trex_count+1 >= UINT_MAX / sizeof(*c->trex_data))

  2321.         return AVERROR_INVALIDDATA;

  2322.     if ((err = av_reallocp_array(&c->trex_data, c->trex_count + 1,

  2323.                                  sizeof(*c->trex_data))) < 0) {

  2324.         c->trex_count = 0;

  2325.         return err;

  2326.     }

  2327.     trex = &c->trex_data[c->trex_count++];

  2328.     avio_r8(pb); /* version */

  2329.     avio_rb24(pb); /* flags */

  2330.     trex->track_id = avio_rb32(pb);

  2331.     trex->stsd_id  = avio_rb32(pb);

  2332.     trex->duration = avio_rb32(pb);

  2333.     trex->size     = avio_rb32(pb);

  2334.     trex->flags    = avio_rb32(pb);

  2335.     return 0;

  2336. }

  2337. 

  2338. static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2339. {

  2340.     MOVFragment *frag = &c->fragment;

  2341.     AVStream *st = NULL;

  2342.     MOVStreamContext *sc;

  2343.     MOVStts *ctts_data;

  2344.     uint64_t offset;

  2345.     int64_t dts;

  2346.     int data_offset = 0;

  2347.     unsigned entries, first_sample_flags = frag->flags;

  2348.     int flags, distance, i, found_keyframe = 0, err;

  2349. 

  2350.     for (i = 0; i < c->fc->nb_streams; i++) {

  2351.         if (c->fc->streams[i]->id == frag->track_id) {

  2352.             st = c->fc->streams[i];

  2353.             break;

  2354.         }

  2355.     }

  2356.     if (!st) {

  2357.         av_log(c->fc, AV_LOG_ERROR, "could not find corresponding track id %d\n", frag->track_id);

  2358.         return AVERROR_INVALIDDATA;

  2359.     }

  2360.     sc = st->priv_data;

  2361.     if (sc->pseudo_stream_id+1 != frag->stsd_id)

  2362.         return 0;

  2363.     avio_r8(pb); /* version */

  2364.     flags = avio_rb24(pb);

  2365.     entries = avio_rb32(pb);

  2366.     av_dlog(c->fc, "flags 0x%x entries %d\n", flags, entries);

  2367. 

  2368.     /* Always assume the presence of composition time offsets.

  2369.      * Without this assumption, for instance, we cannot deal with a track in fragmented movies that meet the following.

  2370.      *  1) in the initial movie, there are no samples.

  2371.      *  2) in the first movie fragment, there is only one sample without composition time offset.

  2372.      *  3) in the subsequent movie fragments, there are samples with composition time offset. */

  2373.     if (!sc->ctts_count && sc->sample_count)

  2374.     {

  2375.         /* Complement ctts table if moov atom doesn't have ctts atom. */

  2376.         ctts_data = av_realloc(NULL, sizeof(*sc->ctts_data));

  2377.         if (!ctts_data)

  2378.             return AVERROR(ENOMEM);

  2379.         sc->ctts_data = ctts_data;

  2380.         sc->ctts_data[sc->ctts_count].count = sc->sample_count;

  2381.         sc->ctts_data[sc->ctts_count].duration = 0;

  2382.         sc->ctts_count++;

  2383.     }

  2384.     if ((uint64_t)entries+sc->ctts_count >= UINT_MAX/sizeof(*sc->ctts_data))

  2385.         return AVERROR_INVALIDDATA;

  2386.     if ((err = av_reallocp_array(&sc->ctts_data, entries + sc->ctts_count,

  2387.                                  sizeof(*sc->ctts_data))) < 0) {

  2388.         sc->ctts_count = 0;

  2389.         return err;

  2390.     }

  2391.     if (flags & MOV_TRUN_DATA_OFFSET)        data_offset        = avio_rb32(pb);

  2392.     if (flags & MOV_TRUN_FIRST_SAMPLE_FLAGS) first_sample_flags = avio_rb32(pb);

  2393.     dts    = sc->track_end - sc->time_offset;

  2394.     offset = frag->base_data_offset + data_offset;

  2395.     distance = 0;

  2396.     av_dlog(c->fc, "first sample flags 0x%x\n", first_sample_flags);

  2397.     for (i = 0; i < entries && !pb->eof_reached; i++) {

  2398.         unsigned sample_size = frag->size;

  2399.         int sample_flags = i ? frag->flags : first_sample_flags;

  2400.         unsigned sample_duration = frag->duration;

  2401.         int keyframe = 0;

  2402. 

  2403.         if (flags & MOV_TRUN_SAMPLE_DURATION) sample_duration = avio_rb32(pb);

  2404.         if (flags & MOV_TRUN_SAMPLE_SIZE)     sample_size     = avio_rb32(pb);

  2405.         if (flags & MOV_TRUN_SAMPLE_FLAGS)    sample_flags    = avio_rb32(pb);

  2406.         sc->ctts_data[sc->ctts_count].count = 1;

  2407.         sc->ctts_data[sc->ctts_count].duration = (flags & MOV_TRUN_SAMPLE_CTS) ?

  2408.                                                   avio_rb32(pb) : 0;

  2409.         sc->ctts_count++;

  2410.         if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)

  2411.             keyframe = 1;

  2412.         else if (!found_keyframe)

  2413.             keyframe = found_keyframe =

  2414.                 !(sample_flags & (MOV_FRAG_SAMPLE_FLAG_IS_NON_SYNC |

  2415.                                   MOV_FRAG_SAMPLE_FLAG_DEPENDS_YES));

  2416.         if (keyframe)

  2417.             distance = 0;

  2418.         av_add_index_entry(st, offset, dts, sample_size, distance,

  2419.                            keyframe ? AVINDEX_KEYFRAME : 0);

  2420.         av_dlog(c->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "

  2421.                 "size %d, distance %d, keyframe %d\n", st->index, sc->sample_count+i,

  2422.                 offset, dts, sample_size, distance, keyframe);

  2423.         distance++;

  2424.         dts += sample_duration;

  2425.         offset += sample_size;

  2426.         sc->data_size += sample_size;

  2427.     }

  2428. 

  2429.     if (pb->eof_reached)

  2430.         return AVERROR_EOF;

  2431. 

  2432.     frag->moof_offset = offset;

  2433.     st->duration = sc->track_end = dts + sc->time_offset;

  2434.     return 0;

  2435. }

  2436. 

  2437. /* this atom should be null (from specs), but some buggy files put the 'moov' atom inside it... */

  2438. /* like the files created with Adobe Premiere 5.0, for samples see */

  2439. /* http://graphics.tudelft.nl/~wouter/publications/soundtests/ */

  2440. static int mov_read_wide(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2441. {

  2442.     int err;

  2443. 

  2444.     if (atom.size < 8)

  2445.         return 0; /* continue */

  2446.     if (avio_rb32(pb) != 0) { /* 0 sized mdat atom... use the 'wide' atom size */

  2447.         avio_skip(pb, atom.size - 4);

  2448.         return 0;

  2449.     }

  2450.     atom.type = avio_rl32(pb);

  2451.     atom.size -= 8;

  2452.     if (atom.type != MKTAG('m','d','a','t')) {

  2453.         avio_skip(pb, atom.size);

  2454.         return 0;

  2455.     }

  2456.     err = mov_read_mdat(c, pb, atom);

  2457.     return err;

  2458. }

  2459. 

  2460. static int mov_read_cmov(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2461. {

  2462. #if CONFIG_ZLIB

  2463.     AVIOContext ctx;

  2464.     uint8_t *cmov_data;

  2465.     uint8_t *moov_data; /* uncompressed data */

  2466.     long cmov_len, moov_len;

  2467.     int ret = -1;

  2468. 

  2469.     avio_rb32(pb); /* dcom atom */

  2470.     if (avio_rl32(pb) != MKTAG('d','c','o','m'))

  2471.         return AVERROR_INVALIDDATA;

  2472.     if (avio_rl32(pb) != MKTAG('z','l','i','b')) {

  2473.         av_log(c->fc, AV_LOG_ERROR, "unknown compression for cmov atom !");

  2474.         return AVERROR_INVALIDDATA;

  2475.     }

  2476.     avio_rb32(pb); /* cmvd atom */

  2477.     if (avio_rl32(pb) != MKTAG('c','m','v','d'))

  2478.         return AVERROR_INVALIDDATA;

  2479.     moov_len = avio_rb32(pb); /* uncompressed size */

  2480.     cmov_len = atom.size - 6 * 4;

  2481. 

  2482.     cmov_data = av_malloc(cmov_len);

  2483.     if (!cmov_data)

  2484.         return AVERROR(ENOMEM);

  2485.     moov_data = av_malloc(moov_len);

  2486.     if (!moov_data) {

  2487.         av_free(cmov_data);

  2488.         return AVERROR(ENOMEM);

  2489.     }

  2490.     avio_read(pb, cmov_data, cmov_len);

  2491.     if (uncompress (moov_data, (uLongf *) &moov_len, (const Bytef *)cmov_data, cmov_len) != Z_OK)

  2492.         goto free_and_return;

  2493.     if (ffio_init_context(&ctx, moov_data, moov_len, 0, NULL, NULL, NULL, NULL) != 0)

  2494.         goto free_and_return;

  2495.     atom.type = MKTAG('m','o','o','v');

  2496.     atom.size = moov_len;

  2497.     ret = mov_read_default(c, &ctx, atom);

  2498. free_and_return:

  2499.     av_free(moov_data);

  2500.     av_free(cmov_data);

  2501.     return ret;

  2502. #else

  2503.     av_log(c->fc, AV_LOG_ERROR, "this file requires zlib support compiled in\n");

  2504.     return AVERROR(ENOSYS);

  2505. #endif

  2506. }

  2507. 

  2508. /* edit list atom */

  2509. static int mov_read_elst(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2510. {

  2511.     MOVStreamContext *sc;

  2512.     int i, edit_count, version;

  2513. 

  2514.     if (c->fc->nb_streams < 1)

  2515.         return 0;

  2516.     sc = c->fc->streams[c->fc->nb_streams-1]->priv_data;

  2517. 

  2518.     version = avio_r8(pb); /* version */

  2519.     avio_rb24(pb); /* flags */

  2520.     edit_count = avio_rb32(pb); /* entries */

  2521. 

  2522.     if ((uint64_t)edit_count*12+8 > atom.size)

  2523.         return AVERROR_INVALIDDATA;

  2524. 

  2525.     for (i=0; i<edit_count; i++){

  2526.         int64_t time;

  2527.         int64_t duration;

  2528.         if (version == 1) {

  2529.             duration = avio_rb64(pb);

  2530.             time     = avio_rb64(pb);

  2531.         } else {

  2532.             duration = avio_rb32(pb); /* segment duration */

  2533.             time     = (int32_t)avio_rb32(pb); /* media time */

  2534.         }

  2535.         avio_rb32(pb); /* Media rate */

  2536.         if (i == 0 && time >= -1) {

  2537.             sc->time_offset = time != -1 ? time : -duration;

  2538.         }

  2539.     }

  2540. 

  2541.     if (edit_count > 1)

  2542.         av_log(c->fc, AV_LOG_WARNING, "multiple edit list entries, "

  2543.                "a/v desync might occur, patch welcome\n");

  2544. 

  2545.     av_dlog(c->fc, "track[%i].edit_count = %i\n", c->fc->nb_streams-1, edit_count);

  2546.     return 0;

  2547. }

  2548. 

  2549. static const MOVParseTableEntry mov_default_parse_table[] = {

  2550. { MKTAG('a','v','s','s'), mov_read_extradata },

  2551. { MKTAG('c','h','p','l'), mov_read_chpl },

  2552. { MKTAG('c','o','6','4'), mov_read_stco },

  2553. { MKTAG('c','t','t','s'), mov_read_ctts }, /* composition time to sample */

  2554. { MKTAG('d','i','n','f'), mov_read_default },

  2555. { MKTAG('d','r','e','f'), mov_read_dref },

  2556. { MKTAG('e','d','t','s'), mov_read_default },

  2557. { MKTAG('e','l','s','t'), mov_read_elst },

  2558. { MKTAG('e','n','d','a'), mov_read_enda },

  2559. { MKTAG('f','i','e','l'), mov_read_fiel },

  2560. { MKTAG('f','t','y','p'), mov_read_ftyp },

  2561. { MKTAG('g','l','b','l'), mov_read_glbl },

  2562. { MKTAG('h','d','l','r'), mov_read_hdlr },

  2563. { MKTAG('i','l','s','t'), mov_read_ilst },

  2564. { MKTAG('j','p','2','h'), mov_read_extradata },

  2565. { MKTAG('m','d','a','t'), mov_read_mdat },

  2566. { MKTAG('m','d','h','d'), mov_read_mdhd },

  2567. { MKTAG('m','d','i','a'), mov_read_default },

  2568. { MKTAG('m','e','t','a'), mov_read_meta },

  2569. { MKTAG('m','i','n','f'), mov_read_default },

  2570. { MKTAG('m','o','o','f'), mov_read_moof },

  2571. { MKTAG('m','o','o','v'), mov_read_moov },

  2572. { MKTAG('m','v','e','x'), mov_read_default },

  2573. { MKTAG('m','v','h','d'), mov_read_mvhd },

  2574. { MKTAG('S','M','I',' '), mov_read_smi }, /* Sorenson extension ??? */

  2575. { MKTAG('a','l','a','c'), mov_read_extradata }, /* alac specific atom */

  2576. { MKTAG('a','v','c','C'), mov_read_glbl },

  2577. { MKTAG('p','a','s','p'), mov_read_pasp },

  2578. { MKTAG('s','t','b','l'), mov_read_default },

  2579. { MKTAG('s','t','c','o'), mov_read_stco },

  2580. { MKTAG('s','t','p','s'), mov_read_stps },

  2581. { MKTAG('s','t','r','f'), mov_read_strf },

  2582. { MKTAG('s','t','s','c'), mov_read_stsc },

  2583. { MKTAG('s','t','s','d'), mov_read_stsd }, /* sample description */

  2584. { MKTAG('s','t','s','s'), mov_read_stss }, /* sync sample */

  2585. { MKTAG('s','t','s','z'), mov_read_stsz }, /* sample size */

  2586. { MKTAG('s','t','t','s'), mov_read_stts },

  2587. { MKTAG('s','t','z','2'), mov_read_stsz }, /* compact sample size */

  2588. { MKTAG('t','k','h','d'), mov_read_tkhd }, /* track header */

  2589. { MKTAG('t','f','h','d'), mov_read_tfhd }, /* track fragment header */

  2590. { MKTAG('t','r','a','k'), mov_read_trak },

  2591. { MKTAG('t','r','a','f'), mov_read_default },

  2592. { MKTAG('t','r','e','f'), mov_read_default },

  2593. { MKTAG('c','h','a','p'), mov_read_chap },

  2594. { MKTAG('t','r','e','x'), mov_read_trex },

  2595. { MKTAG('t','r','u','n'), mov_read_trun },

  2596. { MKTAG('u','d','t','a'), mov_read_default },

  2597. { MKTAG('w','a','v','e'), mov_read_wave },

  2598. { MKTAG('e','s','d','s'), mov_read_esds },

  2599. { MKTAG('d','a','c','3'), mov_read_dac3 }, /* AC-3 info */

  2600. { MKTAG('d','e','c','3'), mov_read_dec3 }, /* EAC-3 info */

  2601. { MKTAG('w','i','d','e'), mov_read_wide }, /* place holder */

  2602. { MKTAG('w','f','e','x'), mov_read_wfex },

  2603. { MKTAG('c','m','o','v'), mov_read_cmov },

  2604. { MKTAG('c','h','a','n'), mov_read_chan }, /* channel layout */

  2605. { MKTAG('d','v','c','1'), mov_read_dvc1 },

  2606. { MKTAG('s','b','g','p'), mov_read_sbgp },

  2607. { 0, NULL }

  2608. };

  2609. 

  2610. static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom)

  2611. {

  2612.     int64_t total_size = 0;

  2613.     MOVAtom a;

  2614.     int i;

  2615. 

  2616.     if (atom.size < 0)

  2617.         atom.size = INT64_MAX;

  2618.     while (total_size + 8 < atom.size && !pb->eof_reached) {

  2619.         int (*parse)(MOVContext*, AVIOContext*, MOVAtom) = NULL;

  2620.         a.size = atom.size;

  2621.         a.type=0;

  2622.         if (atom.size >= 8) {

  2623.             a.size = avio_rb32(pb);

  2624.             a.type = avio_rl32(pb);

  2625.         }

  2626.         av_dlog(c->fc, "type: %08x '%.4s' parent:'%.4s' sz: %"PRId64" %"PRId64" %"PRId64"\n",

  2627.                 a.type, (char*)&a.type, (char*)&atom.type, a.size, total_size, atom.size);

  2628.         total_size += 8;

  2629.         if (a.size == 1) { /* 64 bit extended size */

  2630.             a.size = avio_rb64(pb) - 8;

  2631.             total_size += 8;

  2632.         }

  2633.         if (a.size == 0) {

  2634.             a.size = atom.size - total_size;

  2635.             if (a.size <= 8)

  2636.                 break;

  2637.         }

  2638.         a.size -= 8;

  2639.         if (a.size < 0)

  2640.             break;

  2641.         a.size = FFMIN(a.size, atom.size - total_size);

  2642. 

  2643.         for (i = 0; mov_default_parse_table[i].type; i++)

  2644.             if (mov_default_parse_table[i].type == a.type) {

  2645.                 parse = mov_default_parse_table[i].parse;

  2646.                 break;

  2647.             }

  2648. 

  2649.         // container is user data

  2650.         if (!parse && (atom.type == MKTAG('u','d','t','a') ||

  2651.                        atom.type == MKTAG('i','l','s','t')))

  2652.             parse = mov_read_udta_string;

  2653. 

  2654.         if (!parse) { /* skip leaf atoms data */

  2655.             avio_skip(pb, a.size);

  2656.         } else {

  2657.             int64_t start_pos = avio_tell(pb);

  2658.             int64_t left;

  2659.             int err = parse(c, pb, a);

  2660.             if (err < 0)

  2661.                 return err;

  2662.             if (c->found_moov && c->found_mdat &&

  2663.                 ((!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX) ||

  2664.                  start_pos + a.size == avio_size(pb))) {

  2665.                 if (!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX)

  2666.                     c->next_root_atom = start_pos + a.size;

  2667.                 return 0;

  2668.             }

  2669.             left = a.size - avio_tell(pb) + start_pos;

  2670.             if (left > 0) /* skip garbage at atom end */

  2671.                 avio_skip(pb, left);

  2672.             else if (left < 0) {

  2673.                 av_log(c->fc, AV_LOG_WARNING,

  2674.                        "overread end of atom '%.4s' by %"PRId64" bytes\n",

  2675.                        (char*)&a.type, -left);

  2676.                 avio_seek(pb, left, SEEK_CUR);

  2677.             }

  2678.         }

  2679. 

  2680.         total_size += a.size;

  2681.     }

  2682. 

  2683.     if (total_size < atom.size && atom.size < 0x7ffff)

  2684.         avio_skip(pb, atom.size - total_size);

  2685. 

  2686.     return 0;

  2687. }

  2688. 

  2689. static int mov_probe(AVProbeData *p)

  2690. {

  2691.     unsigned int offset;

  2692.     uint32_t tag;

  2693.     int score = 0;

  2694. 

  2695.     /* check file header */

  2696.     offset = 0;

  2697.     for (;;) {

  2698.         /* ignore invalid offset */

  2699.         if ((offset + 8) > (unsigned int)p->buf_size)

  2700.             return score;

  2701.         tag = AV_RL32(p->buf + offset + 4);

  2702.         switch(tag) {

  2703.         /* check for obvious tags */

  2704.         case MKTAG('j','P',' ',' '): /* jpeg 2000 signature */

  2705.         case MKTAG('m','o','o','v'):

  2706.         case MKTAG('m','d','a','t'):

  2707.         case MKTAG('p','n','o','t'): /* detect movs with preview pics like ew.mov and april.mov */

  2708.         case MKTAG('u','d','t','a'): /* Packet Video PVAuthor adds this and a lot of more junk */

  2709.         case MKTAG('f','t','y','p'):

  2710.             return AVPROBE_SCORE_MAX;

  2711.         /* those are more common words, so rate then a bit less */

  2712.         case MKTAG('e','d','i','w'): /* xdcam files have reverted first tags */

  2713.         case MKTAG('w','i','d','e'):

  2714.         case MKTAG('f','r','e','e'):

  2715.         case MKTAG('j','u','n','k'):

  2716.         case MKTAG('p','i','c','t'):

  2717.             return AVPROBE_SCORE_MAX - 5;

  2718.         case MKTAG(0x82,0x82,0x7f,0x7d):

  2719.         case MKTAG('s','k','i','p'):

  2720.         case MKTAG('u','u','i','d'):

  2721.         case MKTAG('p','r','f','l'):

  2722.             offset = AV_RB32(p->buf+offset) + offset;

  2723.             /* if we only find those cause probedata is too small at least rate them */

  2724.             score = AVPROBE_SCORE_EXTENSION;

  2725.             break;

  2726.         default:

  2727.             /* unrecognized tag */

  2728.             return score;

  2729.         }

  2730.     }

  2731. }

  2732. 

  2733. // must be done after parsing all trak because there's no order requirement

  2734. static void mov_read_chapters(AVFormatContext *s)

  2735. {

  2736.     MOVContext *mov = s->priv_data;

  2737.     AVStream *st = NULL;

  2738.     MOVStreamContext *sc;

  2739.     int64_t cur_pos;

  2740.     int i;

  2741. 

  2742.     for (i = 0; i < s->nb_streams; i++)

  2743.         if (s->streams[i]->id == mov->chapter_track) {

  2744.             st = s->streams[i];

  2745.             break;

  2746.         }

  2747.     if (!st) {

  2748.         av_log(s, AV_LOG_ERROR, "Referenced QT chapter track not found\n");

  2749.         return;

  2750.     }

  2751. 

  2752.     st->discard = AVDISCARD_ALL;

  2753.     sc = st->priv_data;

  2754.     cur_pos = avio_tell(sc->pb);

  2755. 

  2756.     for (i = 0; i < st->nb_index_entries; i++) {

  2757.         AVIndexEntry *sample = &st->index_entries[i];

  2758.         int64_t end = i+1 < st->nb_index_entries ? st->index_entries[i+1].timestamp : st->duration;

  2759.         uint8_t *title;

  2760.         uint16_t ch;

  2761.         int len, title_len;

  2762. 

  2763.         if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {

  2764.             av_log(s, AV_LOG_ERROR, "Chapter %d not found in file\n", i);

  2765.             goto finish;

  2766.         }

  2767. 

  2768.         // the first two bytes are the length of the title

  2769.         len = avio_rb16(sc->pb);

  2770.         if (len > sample->size-2)

  2771.             continue;

  2772.         title_len = 2*len + 1;

  2773.         if (!(title = av_mallocz(title_len)))

  2774.             goto finish;

  2775. 

  2776.         // The samples could theoretically be in any encoding if there's an encd

  2777.         // atom following, but in practice are only utf-8 or utf-16, distinguished

  2778.         // instead by the presence of a BOM

  2779.         if (!len) {

  2780.             title[0] = 0;

  2781.         } else {

  2782.             ch = avio_rb16(sc->pb);

  2783.             if (ch == 0xfeff)

  2784.                 avio_get_str16be(sc->pb, len, title, title_len);

  2785.             else if (ch == 0xfffe)

  2786.                 avio_get_str16le(sc->pb, len, title, title_len);

  2787.             else {

  2788.                 AV_WB16(title, ch);

  2789.                 if (len == 1 || len == 2)

  2790.                     title[len] = 0;

  2791.                 else

  2792.                     avio_get_str(sc->pb, len - 2, title + 2, title_len - 2);

  2793.             }

  2794.         }

  2795. 

  2796.         avpriv_new_chapter(s, i, st->time_base, sample->timestamp, end, title);

  2797.         av_freep(&title);

  2798.     }

  2799. finish:

  2800.     avio_seek(sc->pb, cur_pos, SEEK_SET);

  2801. }

  2802. 

  2803. static int mov_read_close(AVFormatContext *s)

  2804. {

  2805.     MOVContext *mov = s->priv_data;

  2806.     int i, j;

  2807. 

  2808.     for (i = 0; i < s->nb_streams; i++) {

  2809.         AVStream *st = s->streams[i];

  2810.         MOVStreamContext *sc = st->priv_data;

  2811. 

  2812.         av_freep(&sc->ctts_data);

  2813.         for (j = 0; j < sc->drefs_count; j++) {

  2814.             av_freep(&sc->drefs[j].path);

  2815.             av_freep(&sc->drefs[j].dir);

  2816.         }

  2817.         av_freep(&sc->drefs);

  2818.         if (sc->pb && sc->pb != s->pb)

  2819.             avio_close(sc->pb);

  2820.     }

  2821. 

  2822.     if (mov->dv_demux) {

  2823.         for (i = 0; i < mov->dv_fctx->nb_streams; i++) {

  2824.             av_freep(&mov->dv_fctx->streams[i]->codec);

  2825.             av_freep(&mov->dv_fctx->streams[i]);

  2826.         }

  2827.         av_freep(&mov->dv_fctx);

  2828.         av_freep(&mov->dv_demux);

  2829.     }

  2830. 

  2831.     av_freep(&mov->trex_data);

  2832. 

  2833.     return 0;

  2834. }

  2835. 

  2836. static int mov_read_header(AVFormatContext *s)

  2837. {

  2838.     MOVContext *mov = s->priv_data;

  2839.     AVIOContext *pb = s->pb;

  2840.     int err;

  2841.     MOVAtom atom = { AV_RL32("root") };

  2842. 

  2843.     mov->fc = s;

  2844.     /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */

  2845.     if (pb->seekable)

  2846.         atom.size = avio_size(pb);

  2847.     else

  2848.         atom.size = INT64_MAX;

  2849. 

  2850.     /* check MOV header */

  2851.     if ((err = mov_read_default(mov, pb, atom)) < 0) {

  2852.         av_log(s, AV_LOG_ERROR, "error reading header: %d\n", err);

  2853.         mov_read_close(s);

  2854.         return err;

  2855.     }

  2856.     if (!mov->found_moov) {

  2857.         av_log(s, AV_LOG_ERROR, "moov atom not found\n");

  2858.         mov_read_close(s);

  2859.         return AVERROR_INVALIDDATA;

  2860.     }

  2861.     av_dlog(mov->fc, "on_parse_exit_offset=%"PRId64"\n", avio_tell(pb));

  2862. 

  2863.     if (pb->seekable && mov->chapter_track > 0)

  2864.         mov_read_chapters(s);

  2865. 

  2866.     if (mov->trex_data) {

  2867.         int i;

  2868.         for (i = 0; i < s->nb_streams; i++) {

  2869.             AVStream *st = s->streams[i];

  2870.             MOVStreamContext *sc = st->priv_data;

  2871.             if (st->duration > 0)

  2872.                 st->codec->bit_rate = sc->data_size * 8 * sc->time_scale / st->duration;

  2873.         }

  2874.     }

  2875. 

  2876.     return 0;

  2877. }

  2878. 

  2879. static AVIndexEntry *mov_find_next_sample(AVFormatContext *s, AVStream **st)

  2880. {

  2881.     AVIndexEntry *sample = NULL;

  2882.     int64_t best_dts = INT64_MAX;

  2883.     int i;

  2884.     for (i = 0; i < s->nb_streams; i++) {

  2885.         AVStream *avst = s->streams[i];

  2886.         MOVStreamContext *msc = avst->priv_data;

  2887.         if (msc->pb && msc->current_sample < avst->nb_index_entries) {

  2888.             AVIndexEntry *current_sample = &avst->index_entries[msc->current_sample];

  2889.             int64_t dts = av_rescale(current_sample->timestamp, AV_TIME_BASE, msc->time_scale);

  2890.             av_dlog(s, "stream %d, sample %d, dts %"PRId64"\n", i, msc->current_sample, dts);

  2891.             if (!sample || (!s->pb->seekable && current_sample->pos < sample->pos) ||

  2892.                 (s->pb->seekable &&

  2893.                  ((msc->pb != s->pb && dts < best_dts) || (msc->pb == s->pb &&

  2894.                  ((FFABS(best_dts - dts) <= AV_TIME_BASE && current_sample->pos < sample->pos) ||

  2895.                   (FFABS(best_dts - dts) > AV_TIME_BASE && dts < best_dts)))))) {

  2896.                 sample = current_sample;

  2897.                 best_dts = dts;

  2898.                 *st = avst;

  2899.             }

  2900.         }

  2901.     }

  2902.     return sample;

  2903. }

  2904. 

  2905. static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)

  2906. {

  2907.     MOVContext *mov = s->priv_data;

  2908.     MOVStreamContext *sc;

  2909.     AVIndexEntry *sample;

  2910.     AVStream *st = NULL;

  2911.     int ret;

  2912.  retry:

  2913.     sample = mov_find_next_sample(s, &st);

  2914.     if (!sample) {

  2915.         mov->found_mdat = 0;

  2916.         if (!mov->next_root_atom)

  2917.             return AVERROR_EOF;

  2918.         avio_seek(s->pb, mov->next_root_atom, SEEK_SET);

  2919.         mov->next_root_atom = 0;

  2920.         if (mov_read_default(mov, s->pb, (MOVAtom){ AV_RL32("root"), INT64_MAX }) < 0 ||

  2921.             s->pb->eof_reached)

  2922.             return AVERROR_EOF;

  2923.         av_dlog(s, "read fragments, offset 0x%"PRIx64"\n", avio_tell(s->pb));

  2924.         goto retry;

  2925.     }

  2926.     sc = st->priv_data;

  2927.     /* must be done just before reading, to avoid infinite loop on sample */

  2928.     sc->current_sample++;

  2929. 

  2930.     if (st->discard != AVDISCARD_ALL) {

  2931.         if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {

  2932.             av_log(mov->fc, AV_LOG_ERROR, "stream %d, offset 0x%"PRIx64": partial file\n",

  2933.                    sc->ffindex, sample->pos);

  2934.             return AVERROR_INVALIDDATA;

  2935.         }

  2936.         ret = av_get_packet(sc->pb, pkt, sample->size);

  2937.         if (ret < 0)

  2938.             return ret;

  2939.         if (sc->has_palette) {

  2940.             uint8_t *pal;

  2941. 

  2942.             pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);

  2943.             if (!pal) {

  2944.                 av_log(mov->fc, AV_LOG_ERROR, "Cannot append palette to packet\n");

  2945.             } else {

  2946.                 memcpy(pal, sc->palette, AVPALETTE_SIZE);

  2947.                 sc->has_palette = 0;

  2948.             }

  2949.         }

  2950. #if CONFIG_DV_DEMUXER

  2951.         if (mov->dv_demux && sc->dv_audio_container) {

  2952.             avpriv_dv_produce_packet(mov->dv_demux, pkt, pkt->data, pkt->size);

  2953.             av_free(pkt->data);

  2954.             pkt->size = 0;

  2955.             ret = avpriv_dv_get_packet(mov->dv_demux, pkt);

  2956.             if (ret < 0)

  2957.                 return ret;

  2958.         }

  2959. #endif

  2960.     }

  2961. 

  2962.     pkt->stream_index = sc->ffindex;

  2963.     pkt->dts = sample->timestamp;

  2964.     if (sc->ctts_data && sc->ctts_index < sc->ctts_count) {

  2965.         pkt->pts = pkt->dts + sc->dts_shift + sc->ctts_data[sc->ctts_index].duration;

  2966.         /* update ctts context */

  2967.         sc->ctts_sample++;

  2968.         if (sc->ctts_index < sc->ctts_count &&

  2969.             sc->ctts_data[sc->ctts_index].count == sc->ctts_sample) {

  2970.             sc->ctts_index++;

  2971.             sc->ctts_sample = 0;

  2972.         }

  2973.         if (sc->wrong_dts)

  2974.             pkt->dts = AV_NOPTS_VALUE;

  2975.     } else {

  2976.         int64_t next_dts = (sc->current_sample < st->nb_index_entries) ?

  2977.             st->index_entries[sc->current_sample].timestamp : st->duration;

  2978.         pkt->duration = next_dts - pkt->dts;

  2979.         pkt->pts = pkt->dts;

  2980.     }

  2981.     if (st->discard == AVDISCARD_ALL)

  2982.         goto retry;

  2983.     pkt->flags |= sample->flags & AVINDEX_KEYFRAME ? AV_PKT_FLAG_KEY : 0;

  2984.     pkt->pos = sample->pos;

  2985.     av_dlog(s, "stream %d, pts %"PRId64", dts %"PRId64", pos 0x%"PRIx64", duration %d\n",

  2986.             pkt->stream_index, pkt->pts, pkt->dts, pkt->pos, pkt->duration);

  2987.     return 0;

  2988. }

  2989. 

  2990. static int mov_seek_stream(AVFormatContext *s, AVStream *st, int64_t timestamp, int flags)

  2991. {

  2992.     MOVStreamContext *sc = st->priv_data;

  2993.     int sample, time_sample;

  2994.     int i;

  2995. 

  2996.     sample = av_index_search_timestamp(st, timestamp, flags);

  2997.     av_dlog(s, "stream %d, timestamp %"PRId64", sample %d\n", st->index, timestamp, sample);

  2998.     if (sample < 0 && st->nb_index_entries && timestamp < st->index_entries[0].timestamp)

  2999.         sample = 0;

  3000.     if (sample < 0) /* not sure what to do */

  3001.         return AVERROR_INVALIDDATA;

  3002.     sc->current_sample = sample;

  3003.     av_dlog(s, "stream %d, found sample %d\n", st->index, sc->current_sample);

  3004.     /* adjust ctts index */

  3005.     if (sc->ctts_data) {

  3006.         time_sample = 0;

  3007.         for (i = 0; i < sc->ctts_count; i++) {

  3008.             int next = time_sample + sc->ctts_data[i].count;

  3009.             if (next > sc->current_sample) {

  3010.                 sc->ctts_index = i;

  3011.                 sc->ctts_sample = sc->current_sample - time_sample;

  3012.                 break;

  3013.             }

  3014.             time_sample = next;

  3015.         }

  3016.     }

  3017.     return sample;

  3018. }

  3019. 

  3020. static int mov_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  3021. {

  3022.     AVStream *st;

  3023.     int64_t seek_timestamp, timestamp;

  3024.     int sample;

  3025.     int i;

  3026. 

  3027.     if (stream_index >= s->nb_streams)

  3028.         return AVERROR_INVALIDDATA;

  3029.     if (sample_time < 0)

  3030.         sample_time = 0;

  3031. 

  3032.     st = s->streams[stream_index];

  3033.     sample = mov_seek_stream(s, st, sample_time, flags);

  3034.     if (sample < 0)

  3035.         return sample;

  3036. 

  3037.     /* adjust seek timestamp to found sample timestamp */

  3038.     seek_timestamp = st->index_entries[sample].timestamp;

  3039. 

  3040.     for (i = 0; i < s->nb_streams; i++) {

  3041.         st = s->streams[i];

  3042.         if (stream_index == i)

  3043.             continue;

  3044. 

  3045.         timestamp = av_rescale_q(seek_timestamp, s->streams[stream_index]->time_base, st->time_base);

  3046.         mov_seek_stream(s, st, timestamp, flags);

  3047.     }

  3048.     return 0;

  3049. }

  3050. 

  3051. AVInputFormat ff_mov_demuxer = {

  3052.     .name           = "mov,mp4,m4a,3gp,3g2,mj2",

  3053.     .long_name      = NULL_IF_CONFIG_SMALL("QuickTime / MOV"),

  3054.     .priv_data_size = sizeof(MOVContext),

  3055.     .read_probe     = mov_probe,

  3056.     .read_header    = mov_read_header,

  3057.     .read_packet    = mov_read_packet,

  3058.     .read_close     = mov_read_close,

  3059.     .read_seek      = mov_read_seek,

  3060. };