• Main Page
  • Related Pages
  • Modules
  • Data Structures
  • Files
  • Examples
  • File List
  • Globals

libavformat/mov.c

Go to the documentation of this file.
00001 /*
00002  * MOV demuxer
00003  * Copyright (c) 2001 Fabrice Bellard
00004  * Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00023 #include <limits.h>
00024 
00025 //#define DEBUG
00026 //#define MOV_EXPORT_ALL_METADATA
00027 
00028 #include "libavutil/intreadwrite.h"
00029 #include "libavutil/avstring.h"
00030 #include "libavutil/dict.h"
00031 #include "avformat.h"
00032 #include "avio_internal.h"
00033 #include "riff.h"
00034 #include "isom.h"
00035 #include "libavcodec/get_bits.h"
00036 
00037 #if CONFIG_ZLIB
00038 #include <zlib.h>
00039 #endif
00040 
00041 /*
00042  * First version by Francois Revol revol@free.fr
00043  * Seek function by Gael Chardon gael.dev@4now.net
00044  *
00045  * Features and limitations:
00046  * - reads most of the QT files I have (at least the structure),
00047  *   Sample QuickTime files with mp3 audio can be found at: http://www.3ivx.com/showcase.html
00048  * - the code is quite ugly... maybe I won't do it recursive next time :-)
00049  *
00050  * Funny I didn't know about http://sourceforge.net/projects/qt-ffmpeg/
00051  * when coding this :) (it's a writer anyway)
00052  *
00053  * Reference documents:
00054  * http://www.geocities.com/xhelmboyx/quicktime/formats/qtm-layout.txt
00055  * Apple:
00056  *  http://developer.apple.com/documentation/QuickTime/QTFF/
00057  *  http://developer.apple.com/documentation/QuickTime/QTFF/qtff.pdf
00058  * QuickTime is a trademark of Apple (AFAIK :))
00059  */
00060 
00061 #include "qtpalette.h"
00062 
00063 
00064 #undef NDEBUG
00065 #include <assert.h>
00066 
00067 /* XXX: it's the first time I make a recursive parser I think... sorry if it's ugly :P */
00068 
00069 /* those functions parse an atom */
00070 /* return code:
00071   0: continue to parse next atom
00072  <0: error occurred, exit
00073 */
00074 /* links atom IDs to parse functions */
00075 typedef struct MOVParseTableEntry {
00076     uint32_t type;
00077     int (*parse)(MOVContext *ctx, AVIOContext *pb, MOVAtom atom);
00078 } MOVParseTableEntry;
00079 
00080 static const MOVParseTableEntry mov_default_parse_table[];
00081 
00082 static int mov_metadata_track_or_disc_number(MOVContext *c, AVIOContext *pb, unsigned len, const char *type)
00083 {
00084     char buf[16];
00085 
00086     avio_rb16(pb); // unknown
00087     snprintf(buf, sizeof(buf), "%d", avio_rb16(pb));
00088     av_dict_set(&c->fc->metadata, type, buf, 0);
00089 
00090     avio_rb16(pb); // total tracks/discs
00091 
00092     return 0;
00093 }
00094 
00095 static const uint32_t mac_to_unicode[128] = {
00096     0x00C4,0x00C5,0x00C7,0x00C9,0x00D1,0x00D6,0x00DC,0x00E1,
00097     0x00E0,0x00E2,0x00E4,0x00E3,0x00E5,0x00E7,0x00E9,0x00E8,
00098     0x00EA,0x00EB,0x00ED,0x00EC,0x00EE,0x00EF,0x00F1,0x00F3,
00099     0x00F2,0x00F4,0x00F6,0x00F5,0x00FA,0x00F9,0x00FB,0x00FC,
00100     0x2020,0x00B0,0x00A2,0x00A3,0x00A7,0x2022,0x00B6,0x00DF,
00101     0x00AE,0x00A9,0x2122,0x00B4,0x00A8,0x2260,0x00C6,0x00D8,
00102     0x221E,0x00B1,0x2264,0x2265,0x00A5,0x00B5,0x2202,0x2211,
00103     0x220F,0x03C0,0x222B,0x00AA,0x00BA,0x03A9,0x00E6,0x00F8,
00104     0x00BF,0x00A1,0x00AC,0x221A,0x0192,0x2248,0x2206,0x00AB,
00105     0x00BB,0x2026,0x00A0,0x00C0,0x00C3,0x00D5,0x0152,0x0153,
00106     0x2013,0x2014,0x201C,0x201D,0x2018,0x2019,0x00F7,0x25CA,
00107     0x00FF,0x0178,0x2044,0x20AC,0x2039,0x203A,0xFB01,0xFB02,
00108     0x2021,0x00B7,0x201A,0x201E,0x2030,0x00C2,0x00CA,0x00C1,
00109     0x00CB,0x00C8,0x00CD,0x00CE,0x00CF,0x00CC,0x00D3,0x00D4,
00110     0xF8FF,0x00D2,0x00DA,0x00DB,0x00D9,0x0131,0x02C6,0x02DC,
00111     0x00AF,0x02D8,0x02D9,0x02DA,0x00B8,0x02DD,0x02DB,0x02C7,
00112 };
00113 
00114 static int mov_read_mac_string(MOVContext *c, AVIOContext *pb, int len,
00115                                char *dst, int dstlen)
00116 {
00117     char *p = dst;
00118     char *end = dst+dstlen-1;
00119     int i;
00120 
00121     for (i = 0; i < len; i++) {
00122         uint8_t t, c = avio_r8(pb);
00123         if (c < 0x80 && p < end)
00124             *p++ = c;
00125         else
00126             PUT_UTF8(mac_to_unicode[c-0x80], t, if (p < end) *p++ = t;);
00127     }
00128     *p = 0;
00129     return p - dst;
00130 }
00131 
00132 static int mov_read_udta_string(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00133 {
00134 #ifdef MOV_EXPORT_ALL_METADATA
00135     char tmp_key[5];
00136 #endif
00137     char str[1024], key2[16], language[4] = {0};
00138     const char *key = NULL;
00139     uint16_t str_size, langcode = 0;
00140     uint32_t data_type = 0;
00141     int (*parse)(MOVContext*, AVIOContext*, unsigned, const char *) = NULL;
00142 
00143     switch (atom.type) {
00144     case MKTAG(0xa9,'n','a','m'): key = "title";     break;
00145     case MKTAG(0xa9,'a','u','t'):
00146     case MKTAG(0xa9,'A','R','T'): key = "artist";    break;
00147     case MKTAG( 'a','A','R','T'): key = "album_artist";break;
00148     case MKTAG(0xa9,'w','r','t'): key = "composer";  break;
00149     case MKTAG( 'c','p','r','t'):
00150     case MKTAG(0xa9,'c','p','y'): key = "copyright"; break;
00151     case MKTAG(0xa9,'g','r','p'): key = "grouping"; break;
00152     case MKTAG(0xa9,'l','y','r'): key = "lyrics"; break;
00153     case MKTAG(0xa9,'c','m','t'):
00154     case MKTAG(0xa9,'i','n','f'): key = "comment";   break;
00155     case MKTAG(0xa9,'a','l','b'): key = "album";     break;
00156     case MKTAG(0xa9,'d','a','y'): key = "date";      break;
00157     case MKTAG(0xa9,'g','e','n'): key = "genre";     break;
00158     case MKTAG(0xa9,'t','o','o'):
00159     case MKTAG(0xa9,'s','w','r'): key = "encoder";   break;
00160     case MKTAG(0xa9,'e','n','c'): key = "encoder";   break;
00161     case MKTAG( 'd','e','s','c'): key = "description";break;
00162     case MKTAG( 'l','d','e','s'): key = "synopsis";  break;
00163     case MKTAG( 't','v','s','h'): key = "show";      break;
00164     case MKTAG( 't','v','e','n'): key = "episode_id";break;
00165     case MKTAG( 't','v','n','n'): key = "network";   break;
00166     case MKTAG( 't','r','k','n'): key = "track";
00167         parse = mov_metadata_track_or_disc_number; break;
00168     case MKTAG( 'd','i','s','k'): key = "disc";
00169         parse = mov_metadata_track_or_disc_number; break;
00170     }
00171 
00172     if (c->itunes_metadata && atom.size > 8) {
00173         int data_size = avio_rb32(pb);
00174         int tag = avio_rl32(pb);
00175         if (tag == MKTAG('d','a','t','a')) {
00176             data_type = avio_rb32(pb); // type
00177             avio_rb32(pb); // unknown
00178             str_size = data_size - 16;
00179             atom.size -= 16;
00180         } else return 0;
00181     } else if (atom.size > 4 && key && !c->itunes_metadata) {
00182         str_size = avio_rb16(pb); // string length
00183         langcode = avio_rb16(pb);
00184         ff_mov_lang_to_iso639(langcode, language);
00185         atom.size -= 4;
00186     } else
00187         str_size = atom.size;
00188 
00189 #ifdef MOV_EXPORT_ALL_METADATA
00190     if (!key) {
00191         snprintf(tmp_key, 5, "%.4s", (char*)&atom.type);
00192         key = tmp_key;
00193     }
00194 #endif
00195 
00196     if (!key)
00197         return 0;
00198     if (atom.size < 0)
00199         return -1;
00200 
00201     str_size = FFMIN3(sizeof(str)-1, str_size, atom.size);
00202 
00203     if (parse)
00204         parse(c, pb, str_size, key);
00205     else {
00206         if (data_type == 3 || (data_type == 0 && langcode < 0x800)) { // MAC Encoded
00207             mov_read_mac_string(c, pb, str_size, str, sizeof(str));
00208         } else {
00209             avio_read(pb, str, str_size);
00210             str[str_size] = 0;
00211         }
00212         av_dict_set(&c->fc->metadata, key, str, 0);
00213         if (*language && strcmp(language, "und")) {
00214             snprintf(key2, sizeof(key2), "%s-%s", key, language);
00215             av_dict_set(&c->fc->metadata, key2, str, 0);
00216         }
00217     }
00218     av_dlog(c->fc, "lang \"%3s\" ", language);
00219     av_dlog(c->fc, "tag \"%s\" value \"%s\" atom \"%.4s\" %d %"PRId64"\n",
00220             key, str, (char*)&atom.type, str_size, atom.size);
00221 
00222     return 0;
00223 }
00224 
00225 static int mov_read_chpl(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00226 {
00227     int64_t start;
00228     int i, nb_chapters, str_len, version;
00229     char str[256+1];
00230 
00231     if ((atom.size -= 5) < 0)
00232         return 0;
00233 
00234     version = avio_r8(pb);
00235     avio_rb24(pb);
00236     if (version)
00237         avio_rb32(pb); // ???
00238     nb_chapters = avio_r8(pb);
00239 
00240     for (i = 0; i < nb_chapters; i++) {
00241         if (atom.size < 9)
00242             return 0;
00243 
00244         start = avio_rb64(pb);
00245         str_len = avio_r8(pb);
00246 
00247         if ((atom.size -= 9+str_len) < 0)
00248             return 0;
00249 
00250         avio_read(pb, str, str_len);
00251         str[str_len] = 0;
00252         ff_new_chapter(c->fc, i, (AVRational){1,10000000}, start, AV_NOPTS_VALUE, str);
00253     }
00254     return 0;
00255 }
00256 
00257 static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00258 {
00259     int64_t total_size = 0;
00260     MOVAtom a;
00261     int i;
00262 
00263     if (atom.size < 0)
00264         atom.size = INT64_MAX;
00265     while (total_size + 8 < atom.size && !url_feof(pb)) {
00266         int (*parse)(MOVContext*, AVIOContext*, MOVAtom) = NULL;
00267         a.size = atom.size;
00268         a.type=0;
00269         if(atom.size >= 8) {
00270             a.size = avio_rb32(pb);
00271             a.type = avio_rl32(pb);
00272         }
00273         av_dlog(c->fc, "type: %08x '%.4s' parent:'%.4s' sz: %"PRId64" %"PRId64" %"PRId64"\n",
00274                 a.type, (char*)&a.type, (char*)&atom.type, a.size, total_size, atom.size);
00275         total_size += 8;
00276         if (a.size == 1) { /* 64 bit extended size */
00277             a.size = avio_rb64(pb) - 8;
00278             total_size += 8;
00279         }
00280         if (a.size == 0) {
00281             a.size = atom.size - total_size;
00282             if (a.size <= 8)
00283                 break;
00284         }
00285         a.size -= 8;
00286         if(a.size < 0)
00287             break;
00288         a.size = FFMIN(a.size, atom.size - total_size);
00289 
00290         for (i = 0; mov_default_parse_table[i].type; i++)
00291             if (mov_default_parse_table[i].type == a.type) {
00292                 parse = mov_default_parse_table[i].parse;
00293                 break;
00294             }
00295 
00296         // container is user data
00297         if (!parse && (atom.type == MKTAG('u','d','t','a') ||
00298                        atom.type == MKTAG('i','l','s','t')))
00299             parse = mov_read_udta_string;
00300 
00301         if (!parse) { /* skip leaf atoms data */
00302             avio_skip(pb, a.size);
00303         } else {
00304             int64_t start_pos = avio_tell(pb);
00305             int64_t left;
00306             int err = parse(c, pb, a);
00307             if (err < 0)
00308                 return err;
00309             if (c->found_moov && c->found_mdat &&
00310                 (!pb->seekable || start_pos + a.size == avio_size(pb)))
00311                 return 0;
00312             left = a.size - avio_tell(pb) + start_pos;
00313             if (left > 0) /* skip garbage at atom end */
00314                 avio_skip(pb, left);
00315         }
00316 
00317         total_size += a.size;
00318     }
00319 
00320     if (total_size < atom.size && atom.size < 0x7ffff)
00321         avio_skip(pb, atom.size - total_size);
00322 
00323     return 0;
00324 }
00325 
00326 static int mov_read_dref(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00327 {
00328     AVStream *st;
00329     MOVStreamContext *sc;
00330     int entries, i, j;
00331 
00332     if (c->fc->nb_streams < 1)
00333         return 0;
00334     st = c->fc->streams[c->fc->nb_streams-1];
00335     sc = st->priv_data;
00336 
00337     avio_rb32(pb); // version + flags
00338     entries = avio_rb32(pb);
00339     if (entries >= UINT_MAX / sizeof(*sc->drefs))
00340         return -1;
00341     sc->drefs = av_mallocz(entries * sizeof(*sc->drefs));
00342     if (!sc->drefs)
00343         return AVERROR(ENOMEM);
00344     sc->drefs_count = entries;
00345 
00346     for (i = 0; i < sc->drefs_count; i++) {
00347         MOVDref *dref = &sc->drefs[i];
00348         uint32_t size = avio_rb32(pb);
00349         int64_t next = avio_tell(pb) + size - 4;
00350 
00351         if (size < 12)
00352             return -1;
00353 
00354         dref->type = avio_rl32(pb);
00355         avio_rb32(pb); // version + flags
00356         av_dlog(c->fc, "type %.4s size %d\n", (char*)&dref->type, size);
00357 
00358         if (dref->type == MKTAG('a','l','i','s') && size > 150) {
00359             /* macintosh alias record */
00360             uint16_t volume_len, len;
00361             int16_t type;
00362 
00363             avio_skip(pb, 10);
00364 
00365             volume_len = avio_r8(pb);
00366             volume_len = FFMIN(volume_len, 27);
00367             avio_read(pb, dref->volume, 27);
00368             dref->volume[volume_len] = 0;
00369             av_log(c->fc, AV_LOG_DEBUG, "volume %s, len %d\n", dref->volume, volume_len);
00370 
00371             avio_skip(pb, 12);
00372 
00373             len = avio_r8(pb);
00374             len = FFMIN(len, 63);
00375             avio_read(pb, dref->filename, 63);
00376             dref->filename[len] = 0;
00377             av_log(c->fc, AV_LOG_DEBUG, "filename %s, len %d\n", dref->filename, len);
00378 
00379             avio_skip(pb, 16);
00380 
00381             /* read next level up_from_alias/down_to_target */
00382             dref->nlvl_from = avio_rb16(pb);
00383             dref->nlvl_to   = avio_rb16(pb);
00384             av_log(c->fc, AV_LOG_DEBUG, "nlvl from %d, nlvl to %d\n",
00385                    dref->nlvl_from, dref->nlvl_to);
00386 
00387             avio_skip(pb, 16);
00388 
00389             for (type = 0; type != -1 && avio_tell(pb) < next; ) {
00390                 type = avio_rb16(pb);
00391                 len = avio_rb16(pb);
00392                 av_log(c->fc, AV_LOG_DEBUG, "type %d, len %d\n", type, len);
00393                 if (len&1)
00394                     len += 1;
00395                 if (type == 2) { // absolute path
00396                     av_free(dref->path);
00397                     dref->path = av_mallocz(len+1);
00398                     if (!dref->path)
00399                         return AVERROR(ENOMEM);
00400                     avio_read(pb, dref->path, len);
00401                     if (len > volume_len && !strncmp(dref->path, dref->volume, volume_len)) {
00402                         len -= volume_len;
00403                         memmove(dref->path, dref->path+volume_len, len);
00404                         dref->path[len] = 0;
00405                     }
00406                     for (j = 0; j < len; j++)
00407                         if (dref->path[j] == ':')
00408                             dref->path[j] = '/';
00409                     av_log(c->fc, AV_LOG_DEBUG, "path %s\n", dref->path);
00410                 } else if (type == 0) { // directory name
00411                     av_free(dref->dir);
00412                     dref->dir = av_malloc(len+1);
00413                     if (!dref->dir)
00414                         return AVERROR(ENOMEM);
00415                     avio_read(pb, dref->dir, len);
00416                     dref->dir[len] = 0;
00417                     for (j = 0; j < len; j++)
00418                         if (dref->dir[j] == ':')
00419                             dref->dir[j] = '/';
00420                     av_log(c->fc, AV_LOG_DEBUG, "dir %s\n", dref->dir);
00421                 } else
00422                     avio_skip(pb, len);
00423             }
00424         }
00425         avio_seek(pb, next, SEEK_SET);
00426     }
00427     return 0;
00428 }
00429 
00430 static int mov_read_hdlr(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00431 {
00432     AVStream *st;
00433     uint32_t type;
00434     uint32_t av_unused ctype;
00435 
00436     if (c->fc->nb_streams < 1) // meta before first trak
00437         return 0;
00438 
00439     st = c->fc->streams[c->fc->nb_streams-1];
00440 
00441     avio_r8(pb); /* version */
00442     avio_rb24(pb); /* flags */
00443 
00444     /* component type */
00445     ctype = avio_rl32(pb);
00446     type = avio_rl32(pb); /* component subtype */
00447 
00448     av_dlog(c->fc, "ctype= %.4s (0x%08x)\n", (char*)&ctype, ctype);
00449     av_dlog(c->fc, "stype= %.4s\n", (char*)&type);
00450 
00451     if     (type == MKTAG('v','i','d','e'))
00452         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00453     else if(type == MKTAG('s','o','u','n'))
00454         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00455     else if(type == MKTAG('m','1','a',' '))
00456         st->codec->codec_id = CODEC_ID_MP2;
00457     else if(type == MKTAG('s','u','b','p'))
00458         st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
00459 
00460     avio_rb32(pb); /* component  manufacture */
00461     avio_rb32(pb); /* component flags */
00462     avio_rb32(pb); /* component flags mask */
00463 
00464     return 0;
00465 }
00466 
00467 int ff_mov_read_esds(AVFormatContext *fc, AVIOContext *pb, MOVAtom atom)
00468 {
00469     AVStream *st;
00470     int tag;
00471 
00472     if (fc->nb_streams < 1)
00473         return 0;
00474     st = fc->streams[fc->nb_streams-1];
00475 
00476     avio_rb32(pb); /* version + flags */
00477     ff_mp4_read_descr(fc, pb, &tag);
00478     if (tag == MP4ESDescrTag) {
00479         avio_rb16(pb); /* ID */
00480         avio_r8(pb); /* priority */
00481     } else
00482         avio_rb16(pb); /* ID */
00483 
00484     ff_mp4_read_descr(fc, pb, &tag);
00485     if (tag == MP4DecConfigDescrTag)
00486         ff_mp4_read_dec_config_descr(fc, st, pb);
00487     return 0;
00488 }
00489 
00490 static int mov_read_esds(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00491 {
00492     return ff_mov_read_esds(c->fc, pb, atom);
00493 }
00494 
00495 static int mov_read_dac3(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00496 {
00497     AVStream *st;
00498     int ac3info, acmod, lfeon, bsmod;
00499 
00500     if (c->fc->nb_streams < 1)
00501         return 0;
00502     st = c->fc->streams[c->fc->nb_streams-1];
00503 
00504     ac3info = avio_rb24(pb);
00505     bsmod = (ac3info >> 14) & 0x7;
00506     acmod = (ac3info >> 11) & 0x7;
00507     lfeon = (ac3info >> 10) & 0x1;
00508     st->codec->channels = ((int[]){2,1,2,3,3,4,4,5})[acmod] + lfeon;
00509     st->codec->audio_service_type = bsmod;
00510     if (st->codec->channels > 1 && bsmod == 0x7)
00511         st->codec->audio_service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE;
00512 
00513     return 0;
00514 }
00515 
00516 static int mov_read_wfex(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00517 {
00518     AVStream *st;
00519 
00520     if (c->fc->nb_streams < 1)
00521         return 0;
00522     st = c->fc->streams[c->fc->nb_streams-1];
00523 
00524     ff_get_wav_header(pb, st->codec, atom.size);
00525 
00526     return 0;
00527 }
00528 
00529 static int mov_read_pasp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00530 {
00531     const int num = avio_rb32(pb);
00532     const int den = avio_rb32(pb);
00533     AVStream *st;
00534 
00535     if (c->fc->nb_streams < 1)
00536         return 0;
00537     st = c->fc->streams[c->fc->nb_streams-1];
00538 
00539     if ((st->sample_aspect_ratio.den != 1 || st->sample_aspect_ratio.num) && // default
00540         (den != st->sample_aspect_ratio.den || num != st->sample_aspect_ratio.num)) {
00541         av_log(c->fc, AV_LOG_WARNING,
00542                "sample aspect ratio already set to %d:%d, ignoring 'pasp' atom (%d:%d)\n",
00543                st->sample_aspect_ratio.num, st->sample_aspect_ratio.den,
00544                num, den);
00545     } else if (den != 0) {
00546         st->sample_aspect_ratio.num = num;
00547         st->sample_aspect_ratio.den = den;
00548     }
00549     return 0;
00550 }
00551 
00552 /* this atom contains actual media data */
00553 static int mov_read_mdat(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00554 {
00555     if(atom.size == 0) /* wrong one (MP4) */
00556         return 0;
00557     c->found_mdat=1;
00558     return 0; /* now go for moov */
00559 }
00560 
00561 /* read major brand, minor version and compatible brands and store them as metadata */
00562 static int mov_read_ftyp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00563 {
00564     uint32_t minor_ver;
00565     int comp_brand_size;
00566     char minor_ver_str[11]; /* 32 bit integer -> 10 digits + null */
00567     char* comp_brands_str;
00568     uint8_t type[5] = {0};
00569 
00570     avio_read(pb, type, 4);
00571     if (strcmp(type, "qt  "))
00572         c->isom = 1;
00573     av_log(c->fc, AV_LOG_DEBUG, "ISO: File Type Major Brand: %.4s\n",(char *)&type);
00574     av_dict_set(&c->fc->metadata, "major_brand", type, 0);
00575     minor_ver = avio_rb32(pb); /* minor version */
00576     snprintf(minor_ver_str, sizeof(minor_ver_str), "%d", minor_ver);
00577     av_dict_set(&c->fc->metadata, "minor_version", minor_ver_str, 0);
00578 
00579     comp_brand_size = atom.size - 8;
00580     if (comp_brand_size < 0)
00581         return -1;
00582     comp_brands_str = av_malloc(comp_brand_size + 1); /* Add null terminator */
00583     if (!comp_brands_str)
00584         return AVERROR(ENOMEM);
00585     avio_read(pb, comp_brands_str, comp_brand_size);
00586     comp_brands_str[comp_brand_size] = 0;
00587     av_dict_set(&c->fc->metadata, "compatible_brands", comp_brands_str, 0);
00588     av_freep(&comp_brands_str);
00589 
00590     return 0;
00591 }
00592 
00593 /* this atom should contain all header atoms */
00594 static int mov_read_moov(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00595 {
00596     if (mov_read_default(c, pb, atom) < 0)
00597         return -1;
00598     /* we parsed the 'moov' atom, we can terminate the parsing as soon as we find the 'mdat' */
00599     /* so we don't parse the whole file if over a network */
00600     c->found_moov=1;
00601     return 0; /* now go for mdat */
00602 }
00603 
00604 static int mov_read_moof(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00605 {
00606     c->fragment.moof_offset = avio_tell(pb) - 8;
00607     av_dlog(c->fc, "moof offset %"PRIx64"\n", c->fragment.moof_offset);
00608     return mov_read_default(c, pb, atom);
00609 }
00610 
00611 static void mov_metadata_creation_time(AVDictionary **metadata, time_t time)
00612 {
00613     char buffer[32];
00614     if (time) {
00615         struct tm *ptm;
00616         time -= 2082844800;  /* seconds between 1904-01-01 and Epoch */
00617         ptm = gmtime(&time);
00618         if (!ptm) return;
00619         strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", ptm);
00620         av_dict_set(metadata, "creation_time", buffer, 0);
00621     }
00622 }
00623 
00624 static int mov_read_mdhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00625 {
00626     AVStream *st;
00627     MOVStreamContext *sc;
00628     int version;
00629     char language[4] = {0};
00630     unsigned lang;
00631     time_t creation_time;
00632 
00633     if (c->fc->nb_streams < 1)
00634         return 0;
00635     st = c->fc->streams[c->fc->nb_streams-1];
00636     sc = st->priv_data;
00637 
00638     version = avio_r8(pb);
00639     if (version > 1)
00640         return -1; /* unsupported */
00641 
00642     avio_rb24(pb); /* flags */
00643     if (version == 1) {
00644         creation_time = avio_rb64(pb);
00645         avio_rb64(pb);
00646     } else {
00647         creation_time = avio_rb32(pb);
00648         avio_rb32(pb); /* modification time */
00649     }
00650     mov_metadata_creation_time(&st->metadata, creation_time);
00651 
00652     sc->time_scale = avio_rb32(pb);
00653     st->duration = (version == 1) ? avio_rb64(pb) : avio_rb32(pb); /* duration */
00654 
00655     lang = avio_rb16(pb); /* language */
00656     if (ff_mov_lang_to_iso639(lang, language))
00657         av_dict_set(&st->metadata, "language", language, 0);
00658     avio_rb16(pb); /* quality */
00659 
00660     return 0;
00661 }
00662 
00663 static int mov_read_mvhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00664 {
00665     time_t creation_time;
00666     int version = avio_r8(pb); /* version */
00667     avio_rb24(pb); /* flags */
00668 
00669     if (version == 1) {
00670         creation_time = avio_rb64(pb);
00671         avio_rb64(pb);
00672     } else {
00673         creation_time = avio_rb32(pb);
00674         avio_rb32(pb); /* modification time */
00675     }
00676     mov_metadata_creation_time(&c->fc->metadata, creation_time);
00677     c->time_scale = avio_rb32(pb); /* time scale */
00678 
00679     av_dlog(c->fc, "time scale = %i\n", c->time_scale);
00680 
00681     c->duration = (version == 1) ? avio_rb64(pb) : avio_rb32(pb); /* duration */
00682     avio_rb32(pb); /* preferred scale */
00683 
00684     avio_rb16(pb); /* preferred volume */
00685 
00686     avio_skip(pb, 10); /* reserved */
00687 
00688     avio_skip(pb, 36); /* display matrix */
00689 
00690     avio_rb32(pb); /* preview time */
00691     avio_rb32(pb); /* preview duration */
00692     avio_rb32(pb); /* poster time */
00693     avio_rb32(pb); /* selection time */
00694     avio_rb32(pb); /* selection duration */
00695     avio_rb32(pb); /* current time */
00696     avio_rb32(pb); /* next track ID */
00697 
00698     return 0;
00699 }
00700 
00701 static int mov_read_smi(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00702 {
00703     AVStream *st;
00704 
00705     if (c->fc->nb_streams < 1)
00706         return 0;
00707     st = c->fc->streams[c->fc->nb_streams-1];
00708 
00709     if((uint64_t)atom.size > (1<<30))
00710         return -1;
00711 
00712     // currently SVQ3 decoder expect full STSD header - so let's fake it
00713     // this should be fixed and just SMI header should be passed
00714     av_free(st->codec->extradata);
00715     st->codec->extradata = av_mallocz(atom.size + 0x5a + FF_INPUT_BUFFER_PADDING_SIZE);
00716     if (!st->codec->extradata)
00717         return AVERROR(ENOMEM);
00718     st->codec->extradata_size = 0x5a + atom.size;
00719     memcpy(st->codec->extradata, "SVQ3", 4); // fake
00720     avio_read(pb, st->codec->extradata + 0x5a, atom.size);
00721     av_dlog(c->fc, "Reading SMI %"PRId64"  %s\n", atom.size, st->codec->extradata + 0x5a);
00722     return 0;
00723 }
00724 
00725 static int mov_read_enda(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00726 {
00727     AVStream *st;
00728     int little_endian;
00729 
00730     if (c->fc->nb_streams < 1)
00731         return 0;
00732     st = c->fc->streams[c->fc->nb_streams-1];
00733 
00734     little_endian = avio_rb16(pb) & 0xFF;
00735     av_dlog(c->fc, "enda %d\n", little_endian);
00736     if (little_endian == 1) {
00737         switch (st->codec->codec_id) {
00738         case CODEC_ID_PCM_S24BE:
00739             st->codec->codec_id = CODEC_ID_PCM_S24LE;
00740             break;
00741         case CODEC_ID_PCM_S32BE:
00742             st->codec->codec_id = CODEC_ID_PCM_S32LE;
00743             break;
00744         case CODEC_ID_PCM_F32BE:
00745             st->codec->codec_id = CODEC_ID_PCM_F32LE;
00746             break;
00747         case CODEC_ID_PCM_F64BE:
00748             st->codec->codec_id = CODEC_ID_PCM_F64LE;
00749             break;
00750         default:
00751             break;
00752         }
00753     }
00754     return 0;
00755 }
00756 
00757 /* FIXME modify qdm2/svq3/h264 decoders to take full atom as extradata */
00758 static int mov_read_extradata(MOVContext *c, AVIOContext *pb, MOVAtom atom,
00759                               enum CodecID codec_id)
00760 {
00761     AVStream *st;
00762     uint64_t size;
00763     uint8_t *buf;
00764 
00765     if (c->fc->nb_streams < 1) // will happen with jp2 files
00766         return 0;
00767     st= c->fc->streams[c->fc->nb_streams-1];
00768 
00769     if (st->codec->codec_id != codec_id)
00770         return 0; /* unexpected codec_id - don't mess with extradata */
00771 
00772     size= (uint64_t)st->codec->extradata_size + atom.size + 8 + FF_INPUT_BUFFER_PADDING_SIZE;
00773     if(size > INT_MAX || (uint64_t)atom.size > INT_MAX)
00774         return -1;
00775     buf= av_realloc(st->codec->extradata, size);
00776     if(!buf)
00777         return -1;
00778     st->codec->extradata= buf;
00779     buf+= st->codec->extradata_size;
00780     st->codec->extradata_size= size - FF_INPUT_BUFFER_PADDING_SIZE;
00781     AV_WB32(       buf    , atom.size + 8);
00782     AV_WL32(       buf + 4, atom.type);
00783     avio_read(pb, buf + 8, atom.size);
00784     return 0;
00785 }
00786 
00787 /* wrapper functions for reading ALAC/AVS/MJPEG/MJPEG2000 extradata atoms only for those codecs */
00788 static int mov_read_alac(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00789 {
00790     return mov_read_extradata(c, pb, atom, CODEC_ID_ALAC);
00791 }
00792 
00793 static int mov_read_avss(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00794 {
00795     return mov_read_extradata(c, pb, atom, CODEC_ID_AVS);
00796 }
00797 
00798 static int mov_read_fiel(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00799 {
00800     return mov_read_extradata(c, pb, atom, CODEC_ID_MJPEG);
00801 }
00802 
00803 static int mov_read_jp2h(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00804 {
00805     return mov_read_extradata(c, pb, atom, CODEC_ID_JPEG2000);
00806 }
00807 
00808 static int mov_read_wave(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00809 {
00810     AVStream *st;
00811 
00812     if (c->fc->nb_streams < 1)
00813         return 0;
00814     st = c->fc->streams[c->fc->nb_streams-1];
00815 
00816     if((uint64_t)atom.size > (1<<30))
00817         return -1;
00818 
00819     if (st->codec->codec_id == CODEC_ID_QDM2 || st->codec->codec_id == CODEC_ID_QDMC) {
00820         // pass all frma atom to codec, needed at least for QDMC and QDM2
00821         av_free(st->codec->extradata);
00822         st->codec->extradata = av_mallocz(atom.size + FF_INPUT_BUFFER_PADDING_SIZE);
00823         if (!st->codec->extradata)
00824             return AVERROR(ENOMEM);
00825         st->codec->extradata_size = atom.size;
00826         avio_read(pb, st->codec->extradata, atom.size);
00827     } else if (atom.size > 8) { /* to read frma, esds atoms */
00828         if (mov_read_default(c, pb, atom) < 0)
00829             return -1;
00830     } else
00831         avio_skip(pb, atom.size);
00832     return 0;
00833 }
00834 
00839 static int mov_read_glbl(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00840 {
00841     AVStream *st;
00842 
00843     if (c->fc->nb_streams < 1)
00844         return 0;
00845     st = c->fc->streams[c->fc->nb_streams-1];
00846 
00847     if((uint64_t)atom.size > (1<<30))
00848         return -1;
00849 
00850     av_free(st->codec->extradata);
00851     st->codec->extradata = av_mallocz(atom.size + FF_INPUT_BUFFER_PADDING_SIZE);
00852     if (!st->codec->extradata)
00853         return AVERROR(ENOMEM);
00854     st->codec->extradata_size = atom.size;
00855     avio_read(pb, st->codec->extradata, atom.size);
00856     return 0;
00857 }
00858 
00864 static int mov_read_strf(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00865 {
00866     AVStream *st;
00867 
00868     if (c->fc->nb_streams < 1)
00869         return 0;
00870     if (atom.size <= 40)
00871         return 0;
00872     st = c->fc->streams[c->fc->nb_streams-1];
00873 
00874     if((uint64_t)atom.size > (1<<30))
00875         return -1;
00876 
00877     av_free(st->codec->extradata);
00878     st->codec->extradata = av_mallocz(atom.size - 40 + FF_INPUT_BUFFER_PADDING_SIZE);
00879     if (!st->codec->extradata)
00880         return AVERROR(ENOMEM);
00881     st->codec->extradata_size = atom.size - 40;
00882     avio_skip(pb, 40);
00883     avio_read(pb, st->codec->extradata, atom.size - 40);
00884     return 0;
00885 }
00886 
00887 static int mov_read_stco(MOVContext *c, AVIOContext *pb, MOVAtom atom)
00888 {
00889     AVStream *st;
00890     MOVStreamContext *sc;
00891     unsigned int i, entries;
00892 
00893     if (c->fc->nb_streams < 1)
00894         return 0;
00895     st = c->fc->streams[c->fc->nb_streams-1];
00896     sc = st->priv_data;
00897 
00898     avio_r8(pb); /* version */
00899     avio_rb24(pb); /* flags */
00900 
00901     entries = avio_rb32(pb);
00902 
00903     if(entries >= UINT_MAX/sizeof(int64_t))
00904         return -1;
00905 
00906     sc->chunk_offsets = av_malloc(entries * sizeof(int64_t));
00907     if (!sc->chunk_offsets)
00908         return AVERROR(ENOMEM);
00909     sc->chunk_count = entries;
00910 
00911     if      (atom.type == MKTAG('s','t','c','o'))
00912         for(i=0; i<entries; i++)
00913             sc->chunk_offsets[i] = avio_rb32(pb);
00914     else if (atom.type == MKTAG('c','o','6','4'))
00915         for(i=0; i<entries; i++)
00916             sc->chunk_offsets[i] = avio_rb64(pb);
00917     else
00918         return -1;
00919 
00920     return 0;
00921 }
00922 
00927 enum CodecID ff_mov_get_lpcm_codec_id(int bps, int flags)
00928 {
00929     if (flags & 1) { // floating point
00930         if (flags & 2) { // big endian
00931             if      (bps == 32) return CODEC_ID_PCM_F32BE;
00932             else if (bps == 64) return CODEC_ID_PCM_F64BE;
00933         } else {
00934             if      (bps == 32) return CODEC_ID_PCM_F32LE;
00935             else if (bps == 64) return CODEC_ID_PCM_F64LE;
00936         }
00937     } else {
00938         if (flags & 2) {
00939             if      (bps == 8)
00940                 // signed integer
00941                 if (flags & 4)  return CODEC_ID_PCM_S8;
00942                 else            return CODEC_ID_PCM_U8;
00943             else if (bps == 16) return CODEC_ID_PCM_S16BE;
00944             else if (bps == 24) return CODEC_ID_PCM_S24BE;
00945             else if (bps == 32) return CODEC_ID_PCM_S32BE;
00946         } else {
00947             if      (bps == 8)
00948                 if (flags & 4)  return CODEC_ID_PCM_S8;
00949                 else            return CODEC_ID_PCM_U8;
00950             else if (bps == 16) return CODEC_ID_PCM_S16LE;
00951             else if (bps == 24) return CODEC_ID_PCM_S24LE;
00952             else if (bps == 32) return CODEC_ID_PCM_S32LE;
00953         }
00954     }
00955     return CODEC_ID_NONE;
00956 }
00957 
00958 int ff_mov_read_stsd_entries(MOVContext *c, AVIOContext *pb, int entries)
00959 {
00960     AVStream *st;
00961     MOVStreamContext *sc;
00962     int j, pseudo_stream_id;
00963 
00964     if (c->fc->nb_streams < 1)
00965         return 0;
00966     st = c->fc->streams[c->fc->nb_streams-1];
00967     sc = st->priv_data;
00968 
00969     for(pseudo_stream_id=0; pseudo_stream_id<entries; pseudo_stream_id++) {
00970         //Parsing Sample description table
00971         enum CodecID id;
00972         int dref_id = 1;
00973         MOVAtom a = { AV_RL32("stsd") };
00974         int64_t start_pos = avio_tell(pb);
00975         int size = avio_rb32(pb); /* size */
00976         uint32_t format = avio_rl32(pb); /* data format */
00977 
00978         if (size >= 16) {
00979             avio_rb32(pb); /* reserved */
00980             avio_rb16(pb); /* reserved */
00981             dref_id = avio_rb16(pb);
00982         }
00983 
00984         if (st->codec->codec_tag &&
00985             st->codec->codec_tag != format &&
00986             (c->fc->video_codec_id ? ff_codec_get_id(codec_movvideo_tags, format) != c->fc->video_codec_id
00987                                    : st->codec->codec_tag != MKTAG('j','p','e','g'))
00988            ){
00989             /* Multiple fourcc, we skip JPEG. This is not correct, we should
00990              * export it as a separate AVStream but this needs a few changes
00991              * in the MOV demuxer, patch welcome. */
00992         multiple_stsd:
00993             av_log(c->fc, AV_LOG_WARNING, "multiple fourcc not supported\n");
00994             avio_skip(pb, size - (avio_tell(pb) - start_pos));
00995             continue;
00996         }
00997         /* we cannot demux concatenated h264 streams because of different extradata */
00998         if (st->codec->codec_tag && st->codec->codec_tag == AV_RL32("avc1"))
00999             goto multiple_stsd;
01000         sc->pseudo_stream_id = st->codec->codec_tag ? -1 : pseudo_stream_id;
01001         sc->dref_id= dref_id;
01002 
01003         st->codec->codec_tag = format;
01004         id = ff_codec_get_id(codec_movaudio_tags, format);
01005         if (id<=0 && ((format&0xFFFF) == 'm'+('s'<<8) || (format&0xFFFF) == 'T'+('S'<<8)))
01006             id = ff_codec_get_id(ff_codec_wav_tags, av_bswap32(format)&0xFFFF);
01007 
01008         if (st->codec->codec_type != AVMEDIA_TYPE_VIDEO && id > 0) {
01009             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
01010         } else if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO && /* do not overwrite codec type */
01011                    format && format != MKTAG('m','p','4','s')) { /* skip old asf mpeg4 tag */
01012             id = ff_codec_get_id(codec_movvideo_tags, format);
01013             if (id <= 0)
01014                 id = ff_codec_get_id(ff_codec_bmp_tags, format);
01015             if (id > 0)
01016                 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
01017             else if(st->codec->codec_type == AVMEDIA_TYPE_DATA){
01018                 id = ff_codec_get_id(ff_codec_movsubtitle_tags, format);
01019                 if(id > 0)
01020                     st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
01021             }
01022         }
01023 
01024         av_dlog(c->fc, "size=%d 4CC= %c%c%c%c codec_type=%d\n", size,
01025                 (format >> 0) & 0xff, (format >> 8) & 0xff, (format >> 16) & 0xff,
01026                 (format >> 24) & 0xff, st->codec->codec_type);
01027 
01028         if(st->codec->codec_type==AVMEDIA_TYPE_VIDEO) {
01029             unsigned int color_depth, len;
01030             int color_greyscale;
01031 
01032             st->codec->codec_id = id;
01033             avio_rb16(pb); /* version */
01034             avio_rb16(pb); /* revision level */
01035             avio_rb32(pb); /* vendor */
01036             avio_rb32(pb); /* temporal quality */
01037             avio_rb32(pb); /* spatial quality */
01038 
01039             st->codec->width = avio_rb16(pb); /* width */
01040             st->codec->height = avio_rb16(pb); /* height */
01041 
01042             avio_rb32(pb); /* horiz resolution */
01043             avio_rb32(pb); /* vert resolution */
01044             avio_rb32(pb); /* data size, always 0 */
01045             avio_rb16(pb); /* frames per samples */
01046 
01047             len = avio_r8(pb); /* codec name, pascal string */
01048             if (len > 31)
01049                 len = 31;
01050             mov_read_mac_string(c, pb, len, st->codec->codec_name, 32);
01051             if (len < 31)
01052                 avio_skip(pb, 31 - len);
01053             /* codec_tag YV12 triggers an UV swap in rawdec.c */
01054             if (!memcmp(st->codec->codec_name, "Planar Y'CbCr 8-bit 4:2:0", 25))
01055                 st->codec->codec_tag=MKTAG('I', '4', '2', '0');
01056 
01057             st->codec->bits_per_coded_sample = avio_rb16(pb); /* depth */
01058             st->codec->color_table_id = avio_rb16(pb); /* colortable id */
01059             av_dlog(c->fc, "depth %d, ctab id %d\n",
01060                    st->codec->bits_per_coded_sample, st->codec->color_table_id);
01061             /* figure out the palette situation */
01062             color_depth = st->codec->bits_per_coded_sample & 0x1F;
01063             color_greyscale = st->codec->bits_per_coded_sample & 0x20;
01064 
01065             /* if the depth is 2, 4, or 8 bpp, file is palettized */
01066             if ((color_depth == 2) || (color_depth == 4) ||
01067                 (color_depth == 8)) {
01068                 /* for palette traversal */
01069                 unsigned int color_start, color_count, color_end;
01070                 unsigned char r, g, b;
01071 
01072                 st->codec->palctrl = av_malloc(sizeof(*st->codec->palctrl));
01073                 if (color_greyscale) {
01074                     int color_index, color_dec;
01075                     /* compute the greyscale palette */
01076                     st->codec->bits_per_coded_sample = color_depth;
01077                     color_count = 1 << color_depth;
01078                     color_index = 255;
01079                     color_dec = 256 / (color_count - 1);
01080                     for (j = 0; j < color_count; j++) {
01081                         r = g = b = color_index;
01082                         st->codec->palctrl->palette[j] =
01083                             (r << 16) | (g << 8) | (b);
01084                         color_index -= color_dec;
01085                         if (color_index < 0)
01086                             color_index = 0;
01087                     }
01088                 } else if (st->codec->color_table_id) {
01089                     const uint8_t *color_table;
01090                     /* if flag bit 3 is set, use the default palette */
01091                     color_count = 1 << color_depth;
01092                     if (color_depth == 2)
01093                         color_table = ff_qt_default_palette_4;
01094                     else if (color_depth == 4)
01095                         color_table = ff_qt_default_palette_16;
01096                     else
01097                         color_table = ff_qt_default_palette_256;
01098 
01099                     for (j = 0; j < color_count; j++) {
01100                         r = color_table[j * 3 + 0];
01101                         g = color_table[j * 3 + 1];
01102                         b = color_table[j * 3 + 2];
01103                         st->codec->palctrl->palette[j] =
01104                             (r << 16) | (g << 8) | (b);
01105                     }
01106                 } else {
01107                     /* load the palette from the file */
01108                     color_start = avio_rb32(pb);
01109                     color_count = avio_rb16(pb);
01110                     color_end = avio_rb16(pb);
01111                     if ((color_start <= 255) &&
01112                         (color_end <= 255)) {
01113                         for (j = color_start; j <= color_end; j++) {
01114                             /* each R, G, or B component is 16 bits;
01115                              * only use the top 8 bits; skip alpha bytes
01116                              * up front */
01117                             avio_r8(pb);
01118                             avio_r8(pb);
01119                             r = avio_r8(pb);
01120                             avio_r8(pb);
01121                             g = avio_r8(pb);
01122                             avio_r8(pb);
01123                             b = avio_r8(pb);
01124                             avio_r8(pb);
01125                             st->codec->palctrl->palette[j] =
01126                                 (r << 16) | (g << 8) | (b);
01127                         }
01128                     }
01129                 }
01130                 st->codec->palctrl->palette_changed = 1;
01131             }
01132         } else if(st->codec->codec_type==AVMEDIA_TYPE_AUDIO) {
01133             int bits_per_sample, flags;
01134             uint16_t version = avio_rb16(pb);
01135 
01136             st->codec->codec_id = id;
01137             avio_rb16(pb); /* revision level */
01138             avio_rb32(pb); /* vendor */
01139 
01140             st->codec->channels = avio_rb16(pb);             /* channel count */
01141             av_dlog(c->fc, "audio channels %d\n", st->codec->channels);
01142             st->codec->bits_per_coded_sample = avio_rb16(pb);      /* sample size */
01143 
01144             sc->audio_cid = avio_rb16(pb);
01145             avio_rb16(pb); /* packet size = 0 */
01146 
01147             st->codec->sample_rate = ((avio_rb32(pb) >> 16));
01148 
01149             //Read QT version 1 fields. In version 0 these do not exist.
01150             av_dlog(c->fc, "version =%d, isom =%d\n",version,c->isom);
01151             if(!c->isom) {
01152                 if(version==1) {
01153                     sc->samples_per_frame = avio_rb32(pb);
01154                     avio_rb32(pb); /* bytes per packet */
01155                     sc->bytes_per_frame = avio_rb32(pb);
01156                     avio_rb32(pb); /* bytes per sample */
01157                 } else if(version==2) {
01158                     avio_rb32(pb); /* sizeof struct only */
01159                     st->codec->sample_rate = av_int2dbl(avio_rb64(pb)); /* float 64 */
01160                     st->codec->channels = avio_rb32(pb);
01161                     avio_rb32(pb); /* always 0x7F000000 */
01162                     st->codec->bits_per_coded_sample = avio_rb32(pb); /* bits per channel if sound is uncompressed */
01163                     flags = avio_rb32(pb); /* lpcm format specific flag */
01164                     sc->bytes_per_frame = avio_rb32(pb); /* bytes per audio packet if constant */
01165                     sc->samples_per_frame = avio_rb32(pb); /* lpcm frames per audio packet if constant */
01166                     if (format == MKTAG('l','p','c','m'))
01167                         st->codec->codec_id = ff_mov_get_lpcm_codec_id(st->codec->bits_per_coded_sample, flags);
01168                 }
01169             }
01170 
01171             switch (st->codec->codec_id) {
01172             case CODEC_ID_PCM_S8:
01173             case CODEC_ID_PCM_U8:
01174                 if (st->codec->bits_per_coded_sample == 16)
01175                     st->codec->codec_id = CODEC_ID_PCM_S16BE;
01176                 break;
01177             case CODEC_ID_PCM_S16LE:
01178             case CODEC_ID_PCM_S16BE:
01179                 if (st->codec->bits_per_coded_sample == 8)
01180                     st->codec->codec_id = CODEC_ID_PCM_S8;
01181                 else if (st->codec->bits_per_coded_sample == 24)
01182                     st->codec->codec_id =
01183                         st->codec->codec_id == CODEC_ID_PCM_S16BE ?
01184                         CODEC_ID_PCM_S24BE : CODEC_ID_PCM_S24LE;
01185                 break;
01186             /* set values for old format before stsd version 1 appeared */
01187             case CODEC_ID_MACE3:
01188                 sc->samples_per_frame = 6;
01189                 sc->bytes_per_frame = 2*st->codec->channels;
01190                 break;
01191             case CODEC_ID_MACE6:
01192                 sc->samples_per_frame = 6;
01193                 sc->bytes_per_frame = 1*st->codec->channels;
01194                 break;
01195             case CODEC_ID_ADPCM_IMA_QT:
01196                 sc->samples_per_frame = 64;
01197                 sc->bytes_per_frame = 34*st->codec->channels;
01198                 break;
01199             case CODEC_ID_GSM:
01200                 sc->samples_per_frame = 160;
01201                 sc->bytes_per_frame = 33;
01202                 break;
01203             default:
01204                 break;
01205             }
01206 
01207             bits_per_sample = av_get_bits_per_sample(st->codec->codec_id);
01208             if (bits_per_sample) {
01209                 st->codec->bits_per_coded_sample = bits_per_sample;
01210                 sc->sample_size = (bits_per_sample >> 3) * st->codec->channels;
01211             }
01212         } else if(st->codec->codec_type==AVMEDIA_TYPE_SUBTITLE){
01213             // ttxt stsd contains display flags, justification, background
01214             // color, fonts, and default styles, so fake an atom to read it
01215             MOVAtom fake_atom = { .size = size - (avio_tell(pb) - start_pos) };
01216             if (format != AV_RL32("mp4s")) // mp4s contains a regular esds atom
01217                 mov_read_glbl(c, pb, fake_atom);
01218             st->codec->codec_id= id;
01219             st->codec->width = sc->width;
01220             st->codec->height = sc->height;
01221         } else {
01222             /* other codec type, just skip (rtp, mp4s, tmcd ...) */
01223             avio_skip(pb, size - (avio_tell(pb) - start_pos));
01224         }
01225         /* this will read extra atoms at the end (wave, alac, damr, avcC, SMI ...) */
01226         a.size = size - (avio_tell(pb) - start_pos);
01227         if (a.size > 8) {
01228             if (mov_read_default(c, pb, a) < 0)
01229                 return -1;
01230         } else if (a.size > 0)
01231             avio_skip(pb, a.size);
01232     }
01233 
01234     if(st->codec->codec_type==AVMEDIA_TYPE_AUDIO && st->codec->sample_rate==0 && sc->time_scale>1)
01235         st->codec->sample_rate= sc->time_scale;
01236 
01237     /* special codec parameters handling */
01238     switch (st->codec->codec_id) {
01239 #if CONFIG_DV_DEMUXER
01240     case CODEC_ID_DVAUDIO:
01241         c->dv_fctx = avformat_alloc_context();
01242         c->dv_demux = dv_init_demux(c->dv_fctx);
01243         if (!c->dv_demux) {
01244             av_log(c->fc, AV_LOG_ERROR, "dv demux context init error\n");
01245             return -1;
01246         }
01247         sc->dv_audio_container = 1;
01248         st->codec->codec_id = CODEC_ID_PCM_S16LE;
01249         break;
01250 #endif
01251     /* no ifdef since parameters are always those */
01252     case CODEC_ID_QCELP:
01253         // force sample rate for qcelp when not stored in mov
01254         if (st->codec->codec_tag != MKTAG('Q','c','l','p'))
01255             st->codec->sample_rate = 8000;
01256         st->codec->frame_size= 160;
01257         st->codec->channels= 1; /* really needed */
01258         break;
01259     case CODEC_ID_AMR_NB:
01260     case CODEC_ID_AMR_WB:
01261         st->codec->frame_size= sc->samples_per_frame;
01262         st->codec->channels= 1; /* really needed */
01263         /* force sample rate for amr, stsd in 3gp does not store sample rate */
01264         if (st->codec->codec_id == CODEC_ID_AMR_NB)
01265             st->codec->sample_rate = 8000;
01266         else if (st->codec->codec_id == CODEC_ID_AMR_WB)
01267             st->codec->sample_rate = 16000;
01268         break;
01269     case CODEC_ID_MP2:
01270     case CODEC_ID_MP3:
01271         st->codec->codec_type = AVMEDIA_TYPE_AUDIO; /* force type after stsd for m1a hdlr */
01272         st->need_parsing = AVSTREAM_PARSE_FULL;
01273         break;
01274     case CODEC_ID_GSM:
01275     case CODEC_ID_ADPCM_MS:
01276     case CODEC_ID_ADPCM_IMA_WAV:
01277         st->codec->frame_size = sc->samples_per_frame;
01278         st->codec->block_align = sc->bytes_per_frame;
01279         break;
01280     case CODEC_ID_ALAC:
01281         if (st->codec->extradata_size == 36) {
01282             st->codec->frame_size = AV_RB32(st->codec->extradata+12);
01283             st->codec->channels   = AV_RB8 (st->codec->extradata+21);
01284             st->codec->sample_rate = AV_RB32(st->codec->extradata+32);
01285         }
01286         break;
01287     default:
01288         break;
01289     }
01290 
01291     return 0;
01292 }
01293 
01294 static int mov_read_stsd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
01295 {
01296     int entries;
01297 
01298     avio_r8(pb); /* version */
01299     avio_rb24(pb); /* flags */
01300     entries = avio_rb32(pb);
01301 
01302     return ff_mov_read_stsd_entries(c, pb, entries);
01303 }
01304 
01305 static int mov_read_stsc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
01306 {
01307     AVStream *st;
01308     MOVStreamContext *sc;
01309     unsigned int i, entries;
01310 
01311     if (c->fc->nb_streams < 1)
01312         return 0;
01313     st = c->fc->streams[c->fc->nb_streams-1];
01314     sc = st->priv_data;
01315 
01316     avio_r8(pb); /* version */
01317     avio_rb24(pb); /* flags */
01318 
01319     entries = avio_rb32(pb);
01320 
01321     av_dlog(c->fc, "track[%i].stsc.entries = %i\n", c->fc->nb_streams-1, entries);
01322 
01323     if(entries >= UINT_MAX / sizeof(*sc->stsc_data))
01324         return -1;
01325     sc->stsc_data = av_malloc(entries * sizeof(*sc->stsc_data));
01326     if (!sc->stsc_data)
01327         return AVERROR(ENOMEM);
01328     sc->stsc_count = entries;
01329 
01330     for(i=0; i<entries; i++) {
01331         sc->stsc_data[i].first = avio_rb32(pb);
01332         sc->stsc_data[i].count = avio_rb32(pb);
01333         sc->stsc_data[i].id = avio_rb32(pb);
01334     }
01335     return 0;
01336 }
01337 
01338 static int mov_read_stps(MOVContext *c, AVIOContext *pb, MOVAtom atom)
01339 {
01340     AVStream *st;
01341     MOVStreamContext *sc;
01342     unsigned i, entries;
01343 
01344     if (c->fc->nb_streams < 1)
01345         return 0;
01346     st = c->fc->streams[c->fc->nb_streams-1];
01347     sc = st->priv_data;
01348 
01349     avio_rb32(pb); // version + flags
01350 
01351     entries = avio_rb32(pb);
01352     if (entries >= UINT_MAX / sizeof(*sc->stps_data))
01353         return -1;
01354     sc->stps_data = av_malloc(entries * sizeof(*sc->stps_data));
01355     if (!sc->stps_data)
01356         return AVERROR(ENOMEM);
01357     sc->stps_count = entries;
01358 
01359     for (i = 0; i < entries; i++) {
01360         sc->stps_data[i] = avio_rb32(pb);
01361         //av_dlog(c->fc, "stps %d\n", sc->stps_data[i]);
01362     }
01363 
01364     return 0;
01365 }
01366 
01367 static int mov_read_stss(MOVContext *c, AVIOContext *pb, MOVAtom atom)
01368 {
01369     AVStream *st;
01370     MOVStreamContext *sc;
01371     unsigned int i, entries;
01372 
01373     if (c->fc->nb_streams < 1)
01374         return 0;
01375     st = c->fc->streams[c->fc->nb_streams-1];
01376     sc = st->priv_data;
01377 
01378     avio_r8(pb); /* version */
01379     avio_rb24(pb); /* flags */
01380 
01381     entries = avio_rb32(pb);
01382 
01383     av_dlog(c->fc, "keyframe_count = %d\n", entries);
01384 
01385     if(entries >= UINT_MAX / sizeof(int))
01386         return -1;
01387     sc->keyframes = av_malloc(entries * sizeof(int));
01388     if (!sc->keyframes)
01389         return AVERROR(ENOMEM);
01390     sc->keyframe_count = entries;
01391 
01392     for(i=0; i<entries; i++) {
01393         sc->keyframes[i] = avio_rb32(pb);
01394         //av_dlog(c->fc, "keyframes[]=%d\n", sc->keyframes[i]);
01395     }
01396     return 0;
01397 }
01398 
01399 static int mov_read_stsz(MOVContext *c, AVIOContext *pb, MOVAtom atom)
01400 {
01401     AVStream *st;
01402     MOVStreamContext *sc;
01403     unsigned int i, entries, sample_size, field_size, num_bytes;
01404     GetBitContext gb;
01405     unsigned char* buf;
01406 
01407     if (c->fc->nb_streams < 1)
01408         return 0;
01409     st = c->fc->streams[c->fc->nb_streams-1];
01410     sc = st->priv_data;
01411 
01412     avio_r8(pb); /* version */
01413     avio_rb24(pb); /* flags */
01414 
01415     if (atom.type == MKTAG('s','t','s','z')) {
01416         sample_size = avio_rb32(pb);
01417         if (!sc->sample_size) /* do not overwrite value computed in stsd */
01418             sc->sample_size = sample_size;
01419         field_size = 32;
01420     } else {
01421         sample_size = 0;
01422         avio_rb24(pb); /* reserved */
01423         field_size = avio_r8(pb);
01424     }
01425     entries = avio_rb32(pb);
01426 
01427     av_dlog(c->fc, "sample_size = %d sample_count = %d\n", sc->sample_size, entries);
01428 
01429     sc->sample_count = entries;
01430     if (sample_size)
01431         return 0;
01432 
01433     if (field_size != 4 && field_size != 8 && field_size != 16 && field_size != 32) {
01434         av_log(c->fc, AV_LOG_ERROR, "Invalid sample field size %d\n", field_size);
01435         return -1;
01436     }
01437 
01438     if (entries >= UINT_MAX / sizeof(int) || entries >= (UINT_MAX - 4) / field_size)
01439         return -1;
01440     sc->sample_sizes = av_malloc(entries * sizeof(int));
01441     if (!sc->sample_sizes)
01442         return AVERROR(ENOMEM);
01443 
01444     num_bytes = (entries*field_size+4)>>3;
01445 
01446     buf = av_malloc(num_bytes+FF_INPUT_BUFFER_PADDING_SIZE);
01447     if (!buf) {
01448         av_freep(&sc->sample_sizes);
01449         return AVERROR(ENOMEM);
01450     }
01451 
01452     if (avio_read(pb, buf, num_bytes) < num_bytes) {
01453         av_freep(&sc->sample_sizes);
01454         av_free(buf);
01455         return -1;
01456     }
01457 
01458     init_get_bits(&gb, buf, 8*num_bytes);
01459 
01460     for(i=0; i<entries; i++)
01461         sc->sample_sizes[i] = get_bits_long(&gb, field_size);
01462 
01463     av_free(buf);
01464     return 0;
01465 }
01466 
01467 static int mov_read_stts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
01468 {
01469     AVStream *st;
01470     MOVStreamContext *sc;
01471     unsigned int i, entries;
01472     int64_t duration=0;
01473     int64_t total_sample_count=0;
01474 
01475     if (c->fc->nb_streams < 1)
01476         return 0;
01477     st = c->fc->streams[c->fc->nb_streams-1];
01478     sc = st->priv_data;
01479 
01480     avio_r8(pb); /* version */
01481     avio_rb24(pb); /* flags */
01482     entries = avio_rb32(pb);
01483 
01484     av_dlog(c->fc, "track[%i].stts.entries = %i\n", c->fc->nb_streams-1, entries);
01485 
01486     if(entries >= UINT_MAX / sizeof(*sc->stts_data))
01487         return -1;
01488     sc->stts_data = av_malloc(entries * sizeof(*sc->stts_data));
01489     if (!sc->stts_data)
01490         return AVERROR(ENOMEM);
01491     sc->stts_count = entries;
01492 
01493     for(i=0; i<entries; i++) {
01494         int sample_duration;
01495         int sample_count;
01496 
01497         sample_count=avio_rb32(pb);
01498         sample_duration = avio_rb32(pb);
01499         sc->stts_data[i].count= sample_count;
01500         sc->stts_data[i].duration= sample_duration;
01501 
01502         av_dlog(c->fc, "sample_count=%d, sample_duration=%d\n",sample_count,sample_duration);
01503 
01504         duration+=(int64_t)sample_duration*sample_count;
01505         total_sample_count+=sample_count;
01506     }
01507 
01508     st->nb_frames= total_sample_count;
01509     if(duration)
01510         st->duration= duration;
01511     return 0;
01512 }
01513 
01514 static int mov_read_ctts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
01515 {
01516     AVStream *st;
01517     MOVStreamContext *sc;
01518     unsigned int i, entries;
01519 
01520     if (c->fc->nb_streams < 1)
01521         return 0;
01522     st = c->fc->streams[c->fc->nb_streams-1];
01523     sc = st->priv_data;
01524 
01525     avio_r8(pb); /* version */
01526     avio_rb24(pb); /* flags */
01527     entries = avio_rb32(pb);
01528 
01529     av_dlog(c->fc, "track[%i].ctts.entries = %i\n", c->fc->nb_streams-1, entries);
01530 
01531     if(entries >= UINT_MAX / sizeof(*sc->ctts_data))
01532         return -1;
01533     sc->ctts_data = av_malloc(entries * sizeof(*sc->ctts_data));
01534     if (!sc->ctts_data)
01535         return AVERROR(ENOMEM);
01536     sc->ctts_count = entries;
01537 
01538     for(i=0; i<entries; i++) {
01539         int count    =avio_rb32(pb);
01540         int duration =avio_rb32(pb);
01541 
01542         sc->ctts_data[i].count   = count;
01543         sc->ctts_data[i].duration= duration;
01544         if (duration < 0 && i+1<entries)
01545             sc->dts_shift = FFMAX(sc->dts_shift, -duration);
01546     }
01547 
01548     av_dlog(c->fc, "dts shift %d\n", sc->dts_shift);
01549 
01550     return 0;
01551 }
01552 
01553 static void mov_build_index(MOVContext *mov, AVStream *st)
01554 {
01555     MOVStreamContext *sc = st->priv_data;
01556     int64_t current_offset;
01557     int64_t current_dts = 0;
01558     unsigned int stts_index = 0;
01559     unsigned int stsc_index = 0;
01560     unsigned int stss_index = 0;
01561     unsigned int stps_index = 0;
01562     unsigned int i, j;
01563     uint64_t stream_size = 0;
01564 
01565     /* adjust first dts according to edit list */
01566     if (sc->time_offset && mov->time_scale > 0) {
01567         if (sc->time_offset < 0)
01568             sc->time_offset = av_rescale(sc->time_offset, sc->time_scale, mov->time_scale);
01569         current_dts = -sc->time_offset;
01570         if (sc->ctts_data && sc->stts_data &&
01571             sc->ctts_data[0].duration / FFMAX(sc->stts_data[0].duration, 1) > 16) {
01572             /* more than 16 frames delay, dts are likely wrong
01573                this happens with files created by iMovie */
01574             sc->wrong_dts = 1;
01575             st->codec->has_b_frames = 1;
01576         }
01577     }
01578 
01579     /* only use old uncompressed audio chunk demuxing when stts specifies it */
01580     if (!(st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
01581           sc->stts_count == 1 && sc->stts_data[0].duration == 1)) {
01582         unsigned int current_sample = 0;
01583         unsigned int stts_sample = 0;
01584         unsigned int sample_size;
01585         unsigned int distance = 0;
01586         int key_off = sc->keyframes && sc->keyframes[0] == 1;
01587 
01588         current_dts -= sc->dts_shift;
01589 
01590         if (sc->sample_count >= UINT_MAX / sizeof(*st->index_entries))
01591             return;
01592         st->index_entries = av_malloc(sc->sample_count*sizeof(*st->index_entries));
01593         if (!st->index_entries)
01594             return;
01595         st->index_entries_allocated_size = sc->sample_count*sizeof(*st->index_entries);
01596 
01597         for (i = 0; i < sc->chunk_count; i++) {
01598             current_offset = sc->chunk_offsets[i];
01599             while (stsc_index + 1 < sc->stsc_count &&
01600                 i + 1 == sc->stsc_data[stsc_index + 1].first)
01601                 stsc_index++;
01602             for (j = 0; j < sc->stsc_data[stsc_index].count; j++) {
01603                 int keyframe = 0;
01604                 if (current_sample >= sc->sample_count) {
01605                     av_log(mov->fc, AV_LOG_ERROR, "wrong sample count\n");
01606                     return;
01607                 }
01608 
01609                 if (!sc->keyframe_count || current_sample+key_off == sc->keyframes[stss_index]) {
01610                     keyframe = 1;
01611                     if (stss_index + 1 < sc->keyframe_count)
01612                         stss_index++;
01613                 } else if (sc->stps_count && current_sample+key_off == sc->stps_data[stps_index]) {
01614                     keyframe = 1;
01615                     if (stps_index + 1 < sc->stps_count)
01616                         stps_index++;
01617                 }
01618                 if (keyframe)
01619                     distance = 0;
01620                 sample_size = sc->sample_size > 0 ? sc->sample_size : sc->sample_sizes[current_sample];
01621                 if(sc->pseudo_stream_id == -1 ||
01622                    sc->stsc_data[stsc_index].id - 1 == sc->pseudo_stream_id) {
01623                     AVIndexEntry *e = &st->index_entries[st->nb_index_entries++];
01624                     e->pos = current_offset;
01625                     e->timestamp = current_dts;
01626                     e->size = sample_size;
01627                     e->min_distance = distance;
01628                     e->flags = keyframe ? AVINDEX_KEYFRAME : 0;
01629                     av_dlog(mov->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "
01630                             "size %d, distance %d, keyframe %d\n", st->index, current_sample,
01631                             current_offset, current_dts, sample_size, distance, keyframe);
01632                 }
01633 
01634                 current_offset += sample_size;
01635                 stream_size += sample_size;
01636                 current_dts += sc->stts_data[stts_index].duration;
01637                 distance++;
01638                 stts_sample++;
01639                 current_sample++;
01640                 if (stts_index + 1 < sc->stts_count && stts_sample == sc->stts_data[stts_index].count) {
01641                     stts_sample = 0;
01642                     stts_index++;
01643                 }
01644             }
01645         }
01646         if (st->duration > 0)
01647             st->codec->bit_rate = stream_size*8*sc->time_scale/st->duration;
01648     } else {
01649         unsigned chunk_samples, total = 0;
01650 
01651         // compute total chunk count
01652         for (i = 0; i < sc->stsc_count; i++) {
01653             unsigned count, chunk_count;
01654 
01655             chunk_samples = sc->stsc_data[i].count;
01656             if (sc->samples_per_frame && chunk_samples % sc->samples_per_frame) {
01657                 av_log(mov->fc, AV_LOG_ERROR, "error unaligned chunk\n");
01658                 return;
01659             }
01660 
01661             if (sc->samples_per_frame >= 160) { // gsm
01662                 count = chunk_samples / sc->samples_per_frame;
01663             } else if (sc->samples_per_frame > 1) {
01664                 unsigned samples = (1024/sc->samples_per_frame)*sc->samples_per_frame;
01665                 count = (chunk_samples+samples-1) / samples;
01666             } else {
01667                 count = (chunk_samples+1023) / 1024;
01668             }
01669 
01670             if (i < sc->stsc_count - 1)
01671                 chunk_count = sc->stsc_data[i+1].first - sc->stsc_data[i].first;
01672             else
01673                 chunk_count = sc->chunk_count - (sc->stsc_data[i].first - 1);
01674             total += chunk_count * count;
01675         }
01676 
01677         av_dlog(mov->fc, "chunk count %d\n", total);
01678         if (total >= UINT_MAX / sizeof(*st->index_entries))
01679             return;
01680         st->index_entries = av_malloc(total*sizeof(*st->index_entries));
01681         if (!st->index_entries)
01682             return;
01683         st->index_entries_allocated_size = total*sizeof(*st->index_entries);
01684 
01685         // populate index
01686         for (i = 0; i < sc->chunk_count; i++) {
01687             current_offset = sc->chunk_offsets[i];
01688             if (stsc_index + 1 < sc->stsc_count &&
01689                 i + 1 == sc->stsc_data[stsc_index + 1].first)
01690                 stsc_index++;
01691             chunk_samples = sc->stsc_data[stsc_index].count;
01692 
01693             while (chunk_samples > 0) {
01694                 AVIndexEntry *e;
01695                 unsigned size, samples;
01696 
01697                 if (sc->samples_per_frame >= 160) { // gsm
01698                     samples = sc->samples_per_frame;
01699                     size = sc->bytes_per_frame;
01700                 } else {
01701                     if (sc->samples_per_frame > 1) {
01702                         samples = FFMIN((1024 / sc->samples_per_frame)*
01703                                         sc->samples_per_frame, chunk_samples);
01704                         size = (samples / sc->samples_per_frame) * sc->bytes_per_frame;
01705                     } else {
01706                         samples = FFMIN(1024, chunk_samples);
01707                         size = samples * sc->sample_size;
01708                     }
01709                 }
01710 
01711                 if (st->nb_index_entries >= total) {
01712                     av_log(mov->fc, AV_LOG_ERROR, "wrong chunk count %d\n", total);
01713                     return;
01714                 }
01715                 e = &st->index_entries[st->nb_index_entries++];
01716                 e->pos = current_offset;
01717                 e->timestamp = current_dts;
01718                 e->size = size;
01719                 e->min_distance = 0;
01720                 e->flags = AVINDEX_KEYFRAME;
01721                 av_dlog(mov->fc, "AVIndex stream %d, chunk %d, offset %"PRIx64", dts %"PRId64", "
01722                         "size %d, duration %d\n", st->index, i, current_offset, current_dts,
01723                         size, samples);
01724 
01725                 current_offset += size;
01726                 current_dts += samples;
01727                 chunk_samples -= samples;
01728             }
01729         }
01730     }
01731 }
01732 
01733 static int mov_open_dref(AVIOContext **pb, const char *src, MOVDref *ref)
01734 {
01735     /* try relative path, we do not try the absolute because it can leak information about our
01736        system to an attacker */
01737     if (ref->nlvl_to > 0 && ref->nlvl_from > 0) {
01738         char filename[1024];
01739         const char *src_path;
01740         int i, l;
01741 
01742         /* find a source dir */
01743         src_path = strrchr(src, '/');
01744         if (src_path)
01745             src_path++;
01746         else
01747             src_path = src;
01748 
01749         /* find a next level down to target */
01750         for (i = 0, l = strlen(ref->path) - 1; l >= 0; l--)
01751             if (ref->path[l] == '/') {
01752                 if (i == ref->nlvl_to - 1)
01753                     break;
01754                 else
01755                     i++;
01756             }
01757 
01758         /* compose filename if next level down to target was found */
01759         if (i == ref->nlvl_to - 1 && src_path - src  < sizeof(filename)) {
01760             memcpy(filename, src, src_path - src);
01761             filename[src_path - src] = 0;
01762 
01763             for (i = 1; i < ref->nlvl_from; i++)
01764                 av_strlcat(filename, "../", 1024);
01765 
01766             av_strlcat(filename, ref->path + l + 1, 1024);
01767 
01768             if (!avio_open(pb, filename, AVIO_RDONLY))
01769                 return 0;
01770         }
01771     }
01772 
01773     return AVERROR(ENOENT);
01774 }
01775 
01776 static int mov_read_trak(MOVContext *c, AVIOContext *pb, MOVAtom atom)
01777 {
01778     AVStream *st;
01779     MOVStreamContext *sc;
01780     int ret;
01781 
01782     st = av_new_stream(c->fc, c->fc->nb_streams);
01783     if (!st) return AVERROR(ENOMEM);
01784     sc = av_mallocz(sizeof(MOVStreamContext));
01785     if (!sc) return AVERROR(ENOMEM);
01786 
01787     st->priv_data = sc;
01788     st->codec->codec_type = AVMEDIA_TYPE_DATA;
01789     sc->ffindex = st->index;
01790 
01791     if ((ret = mov_read_default(c, pb, atom)) < 0)
01792         return ret;
01793 
01794     /* sanity checks */
01795     if (sc->chunk_count && (!sc->stts_count || !sc->stsc_count ||
01796                             (!sc->sample_size && !sc->sample_count))) {
01797         av_log(c->fc, AV_LOG_ERROR, "stream %d, missing mandatory atoms, broken header\n",
01798                st->index);
01799         return 0;
01800     }
01801 
01802     if (sc->time_scale <= 0) {
01803         av_log(c->fc, AV_LOG_WARNING, "stream %d, timescale not set\n", st->index);
01804         sc->time_scale = c->time_scale;
01805         if (sc->time_scale <= 0)
01806             sc->time_scale = 1;
01807     }
01808 
01809     av_set_pts_info(st, 64, 1, sc->time_scale);
01810 
01811     if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
01812         !st->codec->frame_size && sc->stts_count == 1) {
01813         st->codec->frame_size = av_rescale(sc->stts_data[0].duration,
01814                                            st->codec->sample_rate, sc->time_scale);
01815         av_dlog(c->fc, "frame size %d\n", st->codec->frame_size);
01816     }
01817 
01818     mov_build_index(c, st);
01819 
01820     if (sc->dref_id-1 < sc->drefs_count && sc->drefs[sc->dref_id-1].path) {
01821         MOVDref *dref = &sc->drefs[sc->dref_id - 1];
01822         if (mov_open_dref(&sc->pb, c->fc->filename, dref) < 0)
01823             av_log(c->fc, AV_LOG_ERROR,
01824                    "stream %d, error opening alias: path='%s', dir='%s', "
01825                    "filename='%s', volume='%s', nlvl_from=%d, nlvl_to=%d\n",
01826                    st->index, dref->path, dref->dir, dref->filename,
01827                    dref->volume, dref->nlvl_from, dref->nlvl_to);
01828     } else
01829         sc->pb = c->fc->pb;
01830 
01831     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
01832         if (!st->sample_aspect_ratio.num &&
01833             (st->codec->width != sc->width || st->codec->height != sc->height)) {
01834             st->sample_aspect_ratio = av_d2q(((double)st->codec->height * sc->width) /
01835                                              ((double)st->codec->width * sc->height), INT_MAX);
01836         }
01837 
01838         av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
01839                   sc->time_scale*st->nb_frames, st->duration, INT_MAX);
01840 
01841         if (sc->stts_count == 1 || (sc->stts_count == 2 && sc->stts_data[1].count == 1))
01842             av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den,
01843                       sc->time_scale, sc->stts_data[0].duration, INT_MAX);
01844     }
01845 
01846     switch (st->codec->codec_id) {
01847 #if CONFIG_H261_DECODER
01848     case CODEC_ID_H261:
01849 #endif
01850 #if CONFIG_H263_DECODER
01851     case CODEC_ID_H263:
01852 #endif
01853 #if CONFIG_H264_DECODER
01854     case CODEC_ID_H264:
01855 #endif
01856 #if CONFIG_MPEG4_DECODER
01857     case CODEC_ID_MPEG4:
01858 #endif
01859         st->codec->width = 0; /* let decoder init width/height */
01860         st->codec->height= 0;
01861         break;
01862     }
01863 
01864     /* Do not need those anymore. */
01865     av_freep(&sc->chunk_offsets);
01866     av_freep(&sc->stsc_data);
01867     av_freep(&sc->sample_sizes);
01868     av_freep(&sc->keyframes);
01869     av_freep(&sc->stts_data);
01870     av_freep(&sc->stps_data);
01871 
01872     return 0;
01873 }
01874 
01875 static int mov_read_ilst(MOVContext *c, AVIOContext *pb, MOVAtom atom)
01876 {
01877     int ret;
01878     c->itunes_metadata = 1;
01879     ret = mov_read_default(c, pb, atom);
01880     c->itunes_metadata = 0;
01881     return ret;
01882 }
01883 
01884 static int mov_read_meta(MOVContext *c, AVIOContext *pb, MOVAtom atom)
01885 {
01886     while (atom.size > 8) {
01887         uint32_t tag = avio_rl32(pb);
01888         atom.size -= 4;
01889         if (tag == MKTAG('h','d','l','r')) {
01890             avio_seek(pb, -8, SEEK_CUR);
01891             atom.size += 8;
01892             return mov_read_default(c, pb, atom);
01893         }
01894     }
01895     return 0;
01896 }
01897 
01898 static int mov_read_tkhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
01899 {
01900     int i;
01901     int width;
01902     int height;
01903     int64_t disp_transform[2];
01904     int display_matrix[3][2];
01905     AVStream *st;
01906     MOVStreamContext *sc;
01907     int version;
01908 
01909     if (c->fc->nb_streams < 1)
01910         return 0;
01911     st = c->fc->streams[c->fc->nb_streams-1];
01912     sc = st->priv_data;
01913 
01914     version = avio_r8(pb);
01915     avio_rb24(pb); /* flags */
01916     /*
01917     MOV_TRACK_ENABLED 0x0001
01918     MOV_TRACK_IN_MOVIE 0x0002
01919     MOV_TRACK_IN_PREVIEW 0x0004
01920     MOV_TRACK_IN_POSTER 0x0008
01921     */
01922 
01923     if (version == 1) {
01924         avio_rb64(pb);
01925         avio_rb64(pb);
01926     } else {
01927         avio_rb32(pb); /* creation time */
01928         avio_rb32(pb); /* modification time */
01929     }
01930     st->id = (int)avio_rb32(pb); /* track id (NOT 0 !)*/
01931     avio_rb32(pb); /* reserved */
01932 
01933     /* highlevel (considering edits) duration in movie timebase */
01934     (version == 1) ? avio_rb64(pb) : avio_rb32(pb);
01935     avio_rb32(pb); /* reserved */
01936     avio_rb32(pb); /* reserved */
01937 
01938     avio_rb16(pb); /* layer */
01939     avio_rb16(pb); /* alternate group */
01940     avio_rb16(pb); /* volume */
01941     avio_rb16(pb); /* reserved */
01942 
01943     //read in the display matrix (outlined in ISO 14496-12, Section 6.2.2)
01944     // they're kept in fixed point format through all calculations
01945     // ignore u,v,z b/c we don't need the scale factor to calc aspect ratio
01946     for (i = 0; i < 3; i++) {
01947         display_matrix[i][0] = avio_rb32(pb);   // 16.16 fixed point
01948         display_matrix[i][1] = avio_rb32(pb);   // 16.16 fixed point
01949         avio_rb32(pb);           // 2.30 fixed point (not used)
01950     }
01951 
01952     width = avio_rb32(pb);       // 16.16 fixed point track width
01953     height = avio_rb32(pb);      // 16.16 fixed point track height
01954     sc->width = width >> 16;
01955     sc->height = height >> 16;
01956 
01957     if (display_matrix[0][0] == -65536 && display_matrix[1][1] == -65536) {
01958          av_dict_set(&st->metadata, "rotate", "180", 0);
01959     }
01960 
01961     // transform the display width/height according to the matrix
01962     // skip this if the display matrix is the default identity matrix
01963     // or if it is rotating the picture, ex iPhone 3GS
01964     // to keep the same scale, use [width height 1<<16]
01965     if (width && height &&
01966         ((display_matrix[0][0] != 65536  ||
01967           display_matrix[1][1] != 65536) &&
01968          !display_matrix[0][1] &&
01969          !display_matrix[1][0] &&
01970          !display_matrix[2][0] && !display_matrix[2][1])) {
01971         for (i = 0; i < 2; i++)
01972             disp_transform[i] =
01973                 (int64_t)  width  * display_matrix[0][i] +
01974                 (int64_t)  height * display_matrix[1][i] +
01975                 ((int64_t) display_matrix[2][i] << 16);
01976 
01977         //sample aspect ratio is new width/height divided by old width/height
01978         st->sample_aspect_ratio = av_d2q(
01979             ((double) disp_transform[0] * height) /
01980             ((double) disp_transform[1] * width), INT_MAX);
01981     }
01982     return 0;
01983 }
01984 
01985 static int mov_read_tfhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
01986 {
01987     MOVFragment *frag = &c->fragment;
01988     MOVTrackExt *trex = NULL;
01989     int flags, track_id, i;
01990 
01991     avio_r8(pb); /* version */
01992     flags = avio_rb24(pb);
01993 
01994     track_id = avio_rb32(pb);
01995     if (!track_id)
01996         return -1;
01997     frag->track_id = track_id;
01998     for (i = 0; i < c->trex_count; i++)
01999         if (c->trex_data[i].track_id == frag->track_id) {
02000             trex = &c->trex_data[i];
02001             break;
02002         }
02003     if (!trex) {
02004         av_log(c->fc, AV_LOG_ERROR, "could not find corresponding trex\n");
02005         return -1;
02006     }
02007 
02008     if (flags & 0x01) frag->base_data_offset = avio_rb64(pb);
02009     else              frag->base_data_offset = frag->moof_offset;
02010     if (flags & 0x02) frag->stsd_id          = avio_rb32(pb);
02011     else              frag->stsd_id          = trex->stsd_id;
02012 
02013     frag->duration = flags & 0x08 ? avio_rb32(pb) : trex->duration;
02014     frag->size     = flags & 0x10 ? avio_rb32(pb) : trex->size;
02015     frag->flags    = flags & 0x20 ? avio_rb32(pb) : trex->flags;
02016     av_dlog(c->fc, "frag flags 0x%x\n", frag->flags);
02017     return 0;
02018 }
02019 
02020 static int mov_read_chap(MOVContext *c, AVIOContext *pb, MOVAtom atom)
02021 {
02022     c->chapter_track = avio_rb32(pb);
02023     return 0;
02024 }
02025 
02026 static int mov_read_trex(MOVContext *c, AVIOContext *pb, MOVAtom atom)
02027 {
02028     MOVTrackExt *trex;
02029 
02030     if ((uint64_t)c->trex_count+1 >= UINT_MAX / sizeof(*c->trex_data))
02031         return -1;
02032     trex = av_realloc(c->trex_data, (c->trex_count+1)*sizeof(*c->trex_data));
02033     if (!trex)
02034         return AVERROR(ENOMEM);
02035     c->trex_data = trex;
02036     trex = &c->trex_data[c->trex_count++];
02037     avio_r8(pb); /* version */
02038     avio_rb24(pb); /* flags */
02039     trex->track_id = avio_rb32(pb);
02040     trex->stsd_id  = avio_rb32(pb);
02041     trex->duration = avio_rb32(pb);
02042     trex->size     = avio_rb32(pb);
02043     trex->flags    = avio_rb32(pb);
02044     return 0;
02045 }
02046 
02047 static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
02048 {
02049     MOVFragment *frag = &c->fragment;
02050     AVStream *st = NULL;
02051     MOVStreamContext *sc;
02052     MOVStts *ctts_data;
02053     uint64_t offset;
02054     int64_t dts;
02055     int data_offset = 0;
02056     unsigned entries, first_sample_flags = frag->flags;
02057     int flags, distance, i;
02058 
02059     for (i = 0; i < c->fc->nb_streams; i++) {
02060         if (c->fc->streams[i]->id == frag->track_id) {
02061             st = c->fc->streams[i];
02062             break;
02063         }
02064     }
02065     if (!st) {
02066         av_log(c->fc, AV_LOG_ERROR, "could not find corresponding track id %d\n", frag->track_id);
02067         return -1;
02068     }
02069     sc = st->priv_data;
02070     if (sc->pseudo_stream_id+1 != frag->stsd_id)
02071         return 0;
02072     avio_r8(pb); /* version */
02073     flags = avio_rb24(pb);
02074     entries = avio_rb32(pb);
02075     av_dlog(c->fc, "flags 0x%x entries %d\n", flags, entries);
02076 
02077     /* Always assume the presence of composition time offsets.
02078      * Without this assumption, for instance, we cannot deal with a track in fragmented movies that meet the following.
02079      *  1) in the initial movie, there are no samples.
02080      *  2) in the first movie fragment, there is only one sample without composition time offset.
02081      *  3) in the subsequent movie fragments, there are samples with composition time offset. */
02082     if (!sc->ctts_count && sc->sample_count)
02083     {
02084         /* Complement ctts table if moov atom doesn't have ctts atom. */
02085         ctts_data = av_malloc(sizeof(*sc->ctts_data));
02086         if (!ctts_data)
02087             return AVERROR(ENOMEM);
02088         sc->ctts_data = ctts_data;
02089         sc->ctts_data[sc->ctts_count].count = sc->sample_count;
02090         sc->ctts_data[sc->ctts_count].duration = 0;
02091         sc->ctts_count++;
02092     }
02093     if ((uint64_t)entries+sc->ctts_count >= UINT_MAX/sizeof(*sc->ctts_data))
02094         return -1;
02095     ctts_data = av_realloc(sc->ctts_data,
02096                            (entries+sc->ctts_count)*sizeof(*sc->ctts_data));
02097     if (!ctts_data)
02098         return AVERROR(ENOMEM);
02099     sc->ctts_data = ctts_data;
02100 
02101     if (flags & 0x001) data_offset        = avio_rb32(pb);
02102     if (flags & 0x004) first_sample_flags = avio_rb32(pb);
02103     dts = st->duration - sc->time_offset;
02104     offset = frag->base_data_offset + data_offset;
02105     distance = 0;
02106     av_dlog(c->fc, "first sample flags 0x%x\n", first_sample_flags);
02107     for (i = 0; i < entries; i++) {
02108         unsigned sample_size = frag->size;
02109         int sample_flags = i ? frag->flags : first_sample_flags;
02110         unsigned sample_duration = frag->duration;
02111         int keyframe;
02112 
02113         if (flags & 0x100) sample_duration = avio_rb32(pb);
02114         if (flags & 0x200) sample_size     = avio_rb32(pb);
02115         if (flags & 0x400) sample_flags    = avio_rb32(pb);
02116         sc->ctts_data[sc->ctts_count].count = 1;
02117         sc->ctts_data[sc->ctts_count].duration = (flags & 0x800) ? avio_rb32(pb) : 0;
02118         sc->ctts_count++;
02119         if ((keyframe = st->codec->codec_type == AVMEDIA_TYPE_AUDIO ||
02120              (flags & 0x004 && !i && !sample_flags) || sample_flags & 0x2000000))
02121             distance = 0;
02122         av_add_index_entry(st, offset, dts, sample_size, distance,
02123                            keyframe ? AVINDEX_KEYFRAME : 0);
02124         av_dlog(c->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "
02125                 "size %d, distance %d, keyframe %d\n", st->index, sc->sample_count+i,
02126                 offset, dts, sample_size, distance, keyframe);
02127         distance++;
02128         dts += sample_duration;
02129         offset += sample_size;
02130     }
02131     frag->moof_offset = offset;
02132     st->duration = dts + sc->time_offset;
02133     return 0;
02134 }
02135 
02136 /* this atom should be null (from specs), but some buggy files put the 'moov' atom inside it... */
02137 /* like the files created with Adobe Premiere 5.0, for samples see */
02138 /* http://graphics.tudelft.nl/~wouter/publications/soundtests/ */
02139 static int mov_read_wide(MOVContext *c, AVIOContext *pb, MOVAtom atom)
02140 {
02141     int err;
02142 
02143     if (atom.size < 8)
02144         return 0; /* continue */
02145     if (avio_rb32(pb) != 0) { /* 0 sized mdat atom... use the 'wide' atom size */
02146         avio_skip(pb, atom.size - 4);
02147         return 0;
02148     }
02149     atom.type = avio_rl32(pb);
02150     atom.size -= 8;
02151     if (atom.type != MKTAG('m','d','a','t')) {
02152         avio_skip(pb, atom.size);
02153         return 0;
02154     }
02155     err = mov_read_mdat(c, pb, atom);
02156     return err;
02157 }
02158 
02159 static int mov_read_cmov(MOVContext *c, AVIOContext *pb, MOVAtom atom)
02160 {
02161 #if CONFIG_ZLIB
02162     AVIOContext ctx;
02163     uint8_t *cmov_data;
02164     uint8_t *moov_data; /* uncompressed data */
02165     long cmov_len, moov_len;
02166     int ret = -1;
02167 
02168     avio_rb32(pb); /* dcom atom */
02169     if (avio_rl32(pb) != MKTAG('d','c','o','m'))
02170         return -1;
02171     if (avio_rl32(pb) != MKTAG('z','l','i','b')) {
02172         av_log(c->fc, AV_LOG_ERROR, "unknown compression for cmov atom !");
02173         return -1;
02174     }
02175     avio_rb32(pb); /* cmvd atom */
02176     if (avio_rl32(pb) != MKTAG('c','m','v','d'))
02177         return -1;
02178     moov_len = avio_rb32(pb); /* uncompressed size */
02179     cmov_len = atom.size - 6 * 4;
02180 
02181     cmov_data = av_malloc(cmov_len);
02182     if (!cmov_data)
02183         return AVERROR(ENOMEM);
02184     moov_data = av_malloc(moov_len);
02185     if (!moov_data) {
02186         av_free(cmov_data);
02187         return AVERROR(ENOMEM);
02188     }
02189     avio_read(pb, cmov_data, cmov_len);
02190     if(uncompress (moov_data, (uLongf *) &moov_len, (const Bytef *)cmov_data, cmov_len) != Z_OK)
02191         goto free_and_return;
02192     if(ffio_init_context(&ctx, moov_data, moov_len, 0, NULL, NULL, NULL, NULL) != 0)
02193         goto free_and_return;
02194     atom.type = MKTAG('m','o','o','v');
02195     atom.size = moov_len;
02196     ret = mov_read_default(c, &ctx, atom);
02197 free_and_return:
02198     av_free(moov_data);
02199     av_free(cmov_data);
02200     return ret;
02201 #else
02202     av_log(c->fc, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
02203     return -1;
02204 #endif
02205 }
02206 
02207 /* edit list atom */
02208 static int mov_read_elst(MOVContext *c, AVIOContext *pb, MOVAtom atom)
02209 {
02210     MOVStreamContext *sc;
02211     int i, edit_count, version;
02212 
02213     if (c->fc->nb_streams < 1)
02214         return 0;
02215     sc = c->fc->streams[c->fc->nb_streams-1]->priv_data;
02216 
02217     version = avio_r8(pb); /* version */
02218     avio_rb24(pb); /* flags */
02219     edit_count = avio_rb32(pb); /* entries */
02220 
02221     if((uint64_t)edit_count*12+8 > atom.size)
02222         return -1;
02223 
02224     for(i=0; i<edit_count; i++){
02225         int64_t time;
02226         int64_t duration;
02227         if (version == 1) {
02228             duration = avio_rb64(pb);
02229             time     = avio_rb64(pb);
02230         } else {
02231             duration = avio_rb32(pb); /* segment duration */
02232             time     = (int32_t)avio_rb32(pb); /* media time */
02233         }
02234         avio_rb32(pb); /* Media rate */
02235         if (i == 0 && time >= -1) {
02236             sc->time_offset = time != -1 ? time : -duration;
02237         }
02238     }
02239 
02240     if(edit_count > 1)
02241         av_log(c->fc, AV_LOG_WARNING, "multiple edit list entries, "
02242                "a/v desync might occur, patch welcome\n");
02243 
02244     av_dlog(c->fc, "track[%i].edit_count = %i\n", c->fc->nb_streams-1, edit_count);
02245     return 0;
02246 }
02247 
02248 static int mov_read_chan(MOVContext *c, AVIOContext *pb, MOVAtom atom)
02249 {
02250     if (atom.size < 16)
02251         return AVERROR_INVALIDDATA;
02252     avio_skip(pb, 4);
02253     ff_mov_read_chan(c->fc, atom.size - 4, c->fc->streams[0]->codec);
02254     return 0;
02255 }
02256 
02257 static const MOVParseTableEntry mov_default_parse_table[] = {
02258 { MKTAG('a','v','s','s'), mov_read_avss },
02259 { MKTAG('c','h','p','l'), mov_read_chpl },
02260 { MKTAG('c','o','6','4'), mov_read_stco },
02261 { MKTAG('c','t','t','s'), mov_read_ctts }, /* composition time to sample */
02262 { MKTAG('d','i','n','f'), mov_read_default },
02263 { MKTAG('d','r','e','f'), mov_read_dref },
02264 { MKTAG('e','d','t','s'), mov_read_default },
02265 { MKTAG('e','l','s','t'), mov_read_elst },
02266 { MKTAG('e','n','d','a'), mov_read_enda },
02267 { MKTAG('f','i','e','l'), mov_read_fiel },
02268 { MKTAG('f','t','y','p'), mov_read_ftyp },
02269 { MKTAG('g','l','b','l'), mov_read_glbl },
02270 { MKTAG('h','d','l','r'), mov_read_hdlr },
02271 { MKTAG('i','l','s','t'), mov_read_ilst },
02272 { MKTAG('j','p','2','h'), mov_read_jp2h },
02273 { MKTAG('m','d','a','t'), mov_read_mdat },
02274 { MKTAG('m','d','h','d'), mov_read_mdhd },
02275 { MKTAG('m','d','i','a'), mov_read_default },
02276 { MKTAG('m','e','t','a'), mov_read_meta },
02277 { MKTAG('m','i','n','f'), mov_read_default },
02278 { MKTAG('m','o','o','f'), mov_read_moof },
02279 { MKTAG('m','o','o','v'), mov_read_moov },
02280 { MKTAG('m','v','e','x'), mov_read_default },
02281 { MKTAG('m','v','h','d'), mov_read_mvhd },
02282 { MKTAG('S','M','I',' '), mov_read_smi }, /* Sorenson extension ??? */
02283 { MKTAG('a','l','a','c'), mov_read_alac }, /* alac specific atom */
02284 { MKTAG('a','v','c','C'), mov_read_glbl },
02285 { MKTAG('p','a','s','p'), mov_read_pasp },
02286 { MKTAG('s','t','b','l'), mov_read_default },
02287 { MKTAG('s','t','c','o'), mov_read_stco },
02288 { MKTAG('s','t','p','s'), mov_read_stps },
02289 { MKTAG('s','t','r','f'), mov_read_strf },
02290 { MKTAG('s','t','s','c'), mov_read_stsc },
02291 { MKTAG('s','t','s','d'), mov_read_stsd }, /* sample description */
02292 { MKTAG('s','t','s','s'), mov_read_stss }, /* sync sample */
02293 { MKTAG('s','t','s','z'), mov_read_stsz }, /* sample size */
02294 { MKTAG('s','t','t','s'), mov_read_stts },
02295 { MKTAG('s','t','z','2'), mov_read_stsz }, /* compact sample size */
02296 { MKTAG('t','k','h','d'), mov_read_tkhd }, /* track header */
02297 { MKTAG('t','f','h','d'), mov_read_tfhd }, /* track fragment header */
02298 { MKTAG('t','r','a','k'), mov_read_trak },
02299 { MKTAG('t','r','a','f'), mov_read_default },
02300 { MKTAG('t','r','e','f'), mov_read_default },
02301 { MKTAG('c','h','a','p'), mov_read_chap },
02302 { MKTAG('t','r','e','x'), mov_read_trex },
02303 { MKTAG('t','r','u','n'), mov_read_trun },
02304 { MKTAG('u','d','t','a'), mov_read_default },
02305 { MKTAG('w','a','v','e'), mov_read_wave },
02306 { MKTAG('e','s','d','s'), mov_read_esds },
02307 { MKTAG('d','a','c','3'), mov_read_dac3 }, /* AC-3 info */
02308 { MKTAG('w','i','d','e'), mov_read_wide }, /* place holder */
02309 { MKTAG('w','f','e','x'), mov_read_wfex },
02310 { MKTAG('c','m','o','v'), mov_read_cmov },
02311 { MKTAG('c','h','a','n'), mov_read_chan },
02312 { 0, NULL }
02313 };
02314 
02315 static int mov_probe(AVProbeData *p)
02316 {
02317     unsigned int offset;
02318     uint32_t tag;
02319     int score = 0;
02320 
02321     /* check file header */
02322     offset = 0;
02323     for(;;) {
02324         /* ignore invalid offset */
02325         if ((offset + 8) > (unsigned int)p->buf_size)
02326             return score;
02327         tag = AV_RL32(p->buf + offset + 4);
02328         switch(tag) {
02329         /* check for obvious tags */
02330         case MKTAG('j','P',' ',' '): /* jpeg 2000 signature */
02331         case MKTAG('m','o','o','v'):
02332         case MKTAG('m','d','a','t'):
02333         case MKTAG('p','n','o','t'): /* detect movs with preview pics like ew.mov and april.mov */
02334         case MKTAG('u','d','t','a'): /* Packet Video PVAuthor adds this and a lot of more junk */
02335         case MKTAG('f','t','y','p'):
02336             return AVPROBE_SCORE_MAX;
02337         /* those are more common words, so rate then a bit less */
02338         case MKTAG('e','d','i','w'): /* xdcam files have reverted first tags */
02339         case MKTAG('w','i','d','e'):
02340         case MKTAG('f','r','e','e'):
02341         case MKTAG('j','u','n','k'):
02342         case MKTAG('p','i','c','t'):
02343             return AVPROBE_SCORE_MAX - 5;
02344         case MKTAG(0x82,0x82,0x7f,0x7d):
02345         case MKTAG('s','k','i','p'):
02346         case MKTAG('u','u','i','d'):
02347         case MKTAG('p','r','f','l'):
02348             offset = AV_RB32(p->buf+offset) + offset;
02349             /* if we only find those cause probedata is too small at least rate them */
02350             score = AVPROBE_SCORE_MAX - 50;
02351             break;
02352         default:
02353             /* unrecognized tag */
02354             return score;
02355         }
02356     }
02357     return score;
02358 }
02359 
02360 // must be done after parsing all trak because there's no order requirement
02361 static void mov_read_chapters(AVFormatContext *s)
02362 {
02363     MOVContext *mov = s->priv_data;
02364     AVStream *st = NULL;
02365     MOVStreamContext *sc;
02366     int64_t cur_pos;
02367     int i;
02368 
02369     for (i = 0; i < s->nb_streams; i++)
02370         if (s->streams[i]->id == mov->chapter_track) {
02371             st = s->streams[i];
02372             break;
02373         }
02374     if (!st) {
02375         av_log(s, AV_LOG_ERROR, "Referenced QT chapter track not found\n");
02376         return;
02377     }
02378 
02379     st->discard = AVDISCARD_ALL;
02380     sc = st->priv_data;
02381     cur_pos = avio_tell(sc->pb);
02382 
02383     for (i = 0; i < st->nb_index_entries; i++) {
02384         AVIndexEntry *sample = &st->index_entries[i];
02385         int64_t end = i+1 < st->nb_index_entries ? st->index_entries[i+1].timestamp : st->duration;
02386         uint8_t *title;
02387         uint16_t ch;
02388         int len, title_len;
02389 
02390         if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {
02391             av_log(s, AV_LOG_ERROR, "Chapter %d not found in file\n", i);
02392             goto finish;
02393         }
02394 
02395         // the first two bytes are the length of the title
02396         len = avio_rb16(sc->pb);
02397         if (len > sample->size-2)
02398             continue;
02399         title_len = 2*len + 1;
02400         if (!(title = av_mallocz(title_len)))
02401             goto finish;
02402 
02403         // The samples could theoretically be in any encoding if there's an encd
02404         // atom following, but in practice are only utf-8 or utf-16, distinguished
02405         // instead by the presence of a BOM
02406         if (!len) {
02407             title[0] = 0;
02408         } else {
02409             ch = avio_rb16(sc->pb);
02410             if (ch == 0xfeff)
02411                 avio_get_str16be(sc->pb, len, title, title_len);
02412             else if (ch == 0xfffe)
02413                 avio_get_str16le(sc->pb, len, title, title_len);
02414             else {
02415                 AV_WB16(title, ch);
02416                 if (len == 1 || len == 2)
02417                     title[len] = 0;
02418                 else
02419                     get_strz(sc->pb, title + 2, len - 1);
02420             }
02421         }
02422 
02423         ff_new_chapter(s, i, st->time_base, sample->timestamp, end, title);
02424         av_freep(&title);
02425     }
02426 finish:
02427     avio_seek(sc->pb, cur_pos, SEEK_SET);
02428 }
02429 
02430 static int mov_read_header(AVFormatContext *s, AVFormatParameters *ap)
02431 {
02432     MOVContext *mov = s->priv_data;
02433     AVIOContext *pb = s->pb;
02434     int err;
02435     MOVAtom atom = { AV_RL32("root") };
02436 
02437     mov->fc = s;
02438     /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */
02439     if(pb->seekable)
02440         atom.size = avio_size(pb);
02441     else
02442         atom.size = INT64_MAX;
02443 
02444     /* check MOV header */
02445     if ((err = mov_read_default(mov, pb, atom)) < 0) {
02446         av_log(s, AV_LOG_ERROR, "error reading header: %d\n", err);
02447         return err;
02448     }
02449     if (!mov->found_moov) {
02450         av_log(s, AV_LOG_ERROR, "moov atom not found\n");
02451         return -1;
02452     }
02453     av_dlog(mov->fc, "on_parse_exit_offset=%"PRId64"\n", avio_tell(pb));
02454 
02455     if (pb->seekable && mov->chapter_track > 0)
02456         mov_read_chapters(s);
02457 
02458     return 0;
02459 }
02460 
02461 static AVIndexEntry *mov_find_next_sample(AVFormatContext *s, AVStream **st)
02462 {
02463     AVIndexEntry *sample = NULL;
02464     int64_t best_dts = INT64_MAX;
02465     int i;
02466     for (i = 0; i < s->nb_streams; i++) {
02467         AVStream *avst = s->streams[i];
02468         MOVStreamContext *msc = avst->priv_data;
02469         if (msc->pb && msc->current_sample < avst->nb_index_entries) {
02470             AVIndexEntry *current_sample = &avst->index_entries[msc->current_sample];
02471             int64_t dts = av_rescale(current_sample->timestamp, AV_TIME_BASE, msc->time_scale);
02472             av_dlog(s, "stream %d, sample %d, dts %"PRId64"\n", i, msc->current_sample, dts);
02473             if (!sample || (!s->pb->seekable && current_sample->pos < sample->pos) ||
02474                 (s->pb->seekable &&
02475                  ((msc->pb != s->pb && dts < best_dts) || (msc->pb == s->pb &&
02476                  ((FFABS(best_dts - dts) <= AV_TIME_BASE && current_sample->pos < sample->pos) ||
02477                   (FFABS(best_dts - dts) > AV_TIME_BASE && dts < best_dts)))))) {
02478                 sample = current_sample;
02479                 best_dts = dts;
02480                 *st = avst;
02481             }
02482         }
02483     }
02484     return sample;
02485 }
02486 
02487 static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)
02488 {
02489     MOVContext *mov = s->priv_data;
02490     MOVStreamContext *sc;
02491     AVIndexEntry *sample;
02492     AVStream *st = NULL;
02493     int ret;
02494  retry:
02495     sample = mov_find_next_sample(s, &st);
02496     if (!sample) {
02497         mov->found_mdat = 0;
02498         if (s->pb->seekable||
02499             mov_read_default(mov, s->pb, (MOVAtom){ AV_RL32("root"), INT64_MAX }) < 0 ||
02500             url_feof(s->pb))
02501             return AVERROR_EOF;
02502         av_dlog(s, "read fragments, offset 0x%"PRIx64"\n", avio_tell(s->pb));
02503         goto retry;
02504     }
02505     sc = st->priv_data;
02506     /* must be done just before reading, to avoid infinite loop on sample */
02507     sc->current_sample++;
02508 
02509     if (st->discard != AVDISCARD_ALL) {
02510         if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {
02511             av_log(mov->fc, AV_LOG_ERROR, "stream %d, offset 0x%"PRIx64": partial file\n",
02512                    sc->ffindex, sample->pos);
02513             return -1;
02514         }
02515         ret = av_get_packet(sc->pb, pkt, sample->size);
02516         if (ret < 0)
02517             return ret;
02518 #if CONFIG_DV_DEMUXER
02519         if (mov->dv_demux && sc->dv_audio_container) {
02520             dv_produce_packet(mov->dv_demux, pkt, pkt->data, pkt->size, pkt->pos);
02521             av_free(pkt->data);
02522             pkt->size = 0;
02523             ret = dv_get_packet(mov->dv_demux, pkt);
02524             if (ret < 0)
02525                 return ret;
02526         }
02527 #endif
02528     }
02529 
02530     pkt->stream_index = sc->ffindex;
02531     pkt->dts = sample->timestamp;
02532     if (sc->ctts_data) {
02533         pkt->pts = pkt->dts + sc->dts_shift + sc->ctts_data[sc->ctts_index].duration;
02534         /* update ctts context */
02535         sc->ctts_sample++;
02536         if (sc->ctts_index < sc->ctts_count &&
02537             sc->ctts_data[sc->ctts_index].count == sc->ctts_sample) {
02538             sc->ctts_index++;
02539             sc->ctts_sample = 0;
02540         }
02541         if (sc->wrong_dts)
02542             pkt->dts = AV_NOPTS_VALUE;
02543     } else {
02544         int64_t next_dts = (sc->current_sample < st->nb_index_entries) ?
02545             st->index_entries[sc->current_sample].timestamp : st->duration;
02546         pkt->duration = next_dts - pkt->dts;
02547         pkt->pts = pkt->dts;
02548     }
02549     if (st->discard == AVDISCARD_ALL)
02550         goto retry;
02551     pkt->flags |= sample->flags & AVINDEX_KEYFRAME ? AV_PKT_FLAG_KEY : 0;
02552     pkt->pos = sample->pos;
02553     av_dlog(s, "stream %d, pts %"PRId64", dts %"PRId64", pos 0x%"PRIx64", duration %d\n",
02554             pkt->stream_index, pkt->pts, pkt->dts, pkt->pos, pkt->duration);
02555     return 0;
02556 }
02557 
02558 static int mov_seek_stream(AVFormatContext *s, AVStream *st, int64_t timestamp, int flags)
02559 {
02560     MOVStreamContext *sc = st->priv_data;
02561     int sample, time_sample;
02562     int i;
02563 
02564     sample = av_index_search_timestamp(st, timestamp, flags);
02565     av_dlog(s, "stream %d, timestamp %"PRId64", sample %d\n", st->index, timestamp, sample);
02566     if (sample < 0 && st->nb_index_entries && timestamp < st->index_entries[0].timestamp)
02567         sample = 0;
02568     if (sample < 0) /* not sure what to do */
02569         return -1;
02570     sc->current_sample = sample;
02571     av_dlog(s, "stream %d, found sample %d\n", st->index, sc->current_sample);
02572     /* adjust ctts index */
02573     if (sc->ctts_data) {
02574         time_sample = 0;
02575         for (i = 0; i < sc->ctts_count; i++) {
02576             int next = time_sample + sc->ctts_data[i].count;
02577             if (next > sc->current_sample) {
02578                 sc->ctts_index = i;
02579                 sc->ctts_sample = sc->current_sample - time_sample;
02580                 break;
02581             }
02582             time_sample = next;
02583         }
02584     }
02585     return sample;
02586 }
02587 
02588 static int mov_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
02589 {
02590     AVStream *st;
02591     int64_t seek_timestamp, timestamp;
02592     int sample;
02593     int i;
02594 
02595     if (stream_index >= s->nb_streams)
02596         return -1;
02597     if (sample_time < 0)
02598         sample_time = 0;
02599 
02600     st = s->streams[stream_index];
02601     sample = mov_seek_stream(s, st, sample_time, flags);
02602     if (sample < 0)
02603         return -1;
02604 
02605     /* adjust seek timestamp to found sample timestamp */
02606     seek_timestamp = st->index_entries[sample].timestamp;
02607 
02608     for (i = 0; i < s->nb_streams; i++) {
02609         st = s->streams[i];
02610         if (stream_index == i)
02611             continue;
02612 
02613         timestamp = av_rescale_q(seek_timestamp, s->streams[stream_index]->time_base, st->time_base);
02614         mov_seek_stream(s, st, timestamp, flags);
02615     }
02616     return 0;
02617 }
02618 
02619 static int mov_read_close(AVFormatContext *s)
02620 {
02621     MOVContext *mov = s->priv_data;
02622     int i, j;
02623 
02624     for (i = 0; i < s->nb_streams; i++) {
02625         AVStream *st = s->streams[i];
02626         MOVStreamContext *sc = st->priv_data;
02627 
02628         av_freep(&sc->ctts_data);
02629         for (j = 0; j < sc->drefs_count; j++) {
02630             av_freep(&sc->drefs[j].path);
02631             av_freep(&sc->drefs[j].dir);
02632         }
02633         av_freep(&sc->drefs);
02634         if (sc->pb && sc->pb != s->pb)
02635             avio_close(sc->pb);
02636 
02637         av_freep(&st->codec->palctrl);
02638     }
02639 
02640     if (mov->dv_demux) {
02641         for(i = 0; i < mov->dv_fctx->nb_streams; i++) {
02642             av_freep(&mov->dv_fctx->streams[i]->codec);
02643             av_freep(&mov->dv_fctx->streams[i]);
02644         }
02645         av_freep(&mov->dv_fctx);
02646         av_freep(&mov->dv_demux);
02647     }
02648 
02649     av_freep(&mov->trex_data);
02650 
02651     return 0;
02652 }
02653 
02654 AVInputFormat ff_mov_demuxer = {
02655     "mov,mp4,m4a,3gp,3g2,mj2",
02656     NULL_IF_CONFIG_SMALL("QuickTime/MPEG-4/Motion JPEG 2000 format"),
02657     sizeof(MOVContext),
02658     mov_probe,
02659     mov_read_header,
02660     mov_read_packet,
02661     mov_read_close,
02662     mov_read_seek,
02663 };

Generated on Fri Feb 22 2013 07:24:31 for FFmpeg by  doxygen 1.7.1