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libavformat/mov.c

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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 DEBUG_METADATA
00027 //#define MOV_EXPORT_ALL_METADATA
00028 
00029 #include "libavutil/intreadwrite.h"
00030 #include "libavutil/avstring.h"
00031 #include "avformat.h"
00032 #include "riff.h"
00033 #include "isom.h"
00034 #include "libavcodec/mpeg4audio.h"
00035 #include "libavcodec/mpegaudiodata.h"
00036 #include "libavcodec/get_bits.h"
00037 
00038 #if CONFIG_ZLIB
00039 #include <zlib.h>
00040 #endif
00041 
00042 /*
00043  * First version by Francois Revol revol@free.fr
00044  * Seek function by Gael Chardon gael.dev@4now.net
00045  *
00046  * Features and limitations:
00047  * - reads most of the QT files I have (at least the structure),
00048  *   Sample QuickTime files with mp3 audio can be found at: http://www.3ivx.com/showcase.html
00049  * - the code is quite ugly... maybe I won't do it recursive next time :-)
00050  *
00051  * Funny I didn't know about http://sourceforge.net/projects/qt-ffmpeg/
00052  * when coding this :) (it's a writer anyway)
00053  *
00054  * Reference documents:
00055  * http://www.geocities.com/xhelmboyx/quicktime/formats/qtm-layout.txt
00056  * Apple:
00057  *  http://developer.apple.com/documentation/QuickTime/QTFF/
00058  *  http://developer.apple.com/documentation/QuickTime/QTFF/qtff.pdf
00059  * QuickTime is a trademark of Apple (AFAIK :))
00060  */
00061 
00062 #include "qtpalette.h"
00063 
00064 
00065 #undef NDEBUG
00066 #include <assert.h>
00067 
00068 /* XXX: it's the first time I make a recursive parser I think... sorry if it's ugly :P */
00069 
00070 /* those functions parse an atom */
00071 /* return code:
00072   0: continue to parse next atom
00073  <0: error occurred, exit
00074 */
00075 /* links atom IDs to parse functions */
00076 typedef struct MOVParseTableEntry {
00077     uint32_t type;
00078     int (*parse)(MOVContext *ctx, ByteIOContext *pb, MOVAtom atom);
00079 } MOVParseTableEntry;
00080 
00081 static const MOVParseTableEntry mov_default_parse_table[];
00082 
00083 static int mov_metadata_trkn(MOVContext *c, ByteIOContext *pb, unsigned len)
00084 {
00085     char buf[16];
00086 
00087     get_be16(pb); // unknown
00088     snprintf(buf, sizeof(buf), "%d", get_be16(pb));
00089     av_metadata_set2(&c->fc->metadata, "track", buf, 0);
00090 
00091     get_be16(pb); // total tracks
00092 
00093     return 0;
00094 }
00095 
00096 static const uint32_t mac_to_unicode[128] = {
00097     0x00C4,0x00C5,0x00C7,0x00C9,0x00D1,0x00D6,0x00DC,0x00E1,
00098     0x00E0,0x00E2,0x00E4,0x00E3,0x00E5,0x00E7,0x00E9,0x00E8,
00099     0x00EA,0x00EB,0x00ED,0x00EC,0x00EE,0x00EF,0x00F1,0x00F3,
00100     0x00F2,0x00F4,0x00F6,0x00F5,0x00FA,0x00F9,0x00FB,0x00FC,
00101     0x2020,0x00B0,0x00A2,0x00A3,0x00A7,0x2022,0x00B6,0x00DF,
00102     0x00AE,0x00A9,0x2122,0x00B4,0x00A8,0x2260,0x00C6,0x00D8,
00103     0x221E,0x00B1,0x2264,0x2265,0x00A5,0x00B5,0x2202,0x2211,
00104     0x220F,0x03C0,0x222B,0x00AA,0x00BA,0x03A9,0x00E6,0x00F8,
00105     0x00BF,0x00A1,0x00AC,0x221A,0x0192,0x2248,0x2206,0x00AB,
00106     0x00BB,0x2026,0x00A0,0x00C0,0x00C3,0x00D5,0x0152,0x0153,
00107     0x2013,0x2014,0x201C,0x201D,0x2018,0x2019,0x00F7,0x25CA,
00108     0x00FF,0x0178,0x2044,0x20AC,0x2039,0x203A,0xFB01,0xFB02,
00109     0x2021,0x00B7,0x201A,0x201E,0x2030,0x00C2,0x00CA,0x00C1,
00110     0x00CB,0x00C8,0x00CD,0x00CE,0x00CF,0x00CC,0x00D3,0x00D4,
00111     0xF8FF,0x00D2,0x00DA,0x00DB,0x00D9,0x0131,0x02C6,0x02DC,
00112     0x00AF,0x02D8,0x02D9,0x02DA,0x00B8,0x02DD,0x02DB,0x02C7,
00113 };
00114 
00115 static int mov_read_mac_string(MOVContext *c, ByteIOContext *pb, int len,
00116                                char *dst, int dstlen)
00117 {
00118     char *p = dst;
00119     char *end = dst+dstlen-1;
00120     int i;
00121 
00122     for (i = 0; i < len; i++) {
00123         uint8_t t, c = get_byte(pb);
00124         if (c < 0x80 && p < end)
00125             *p++ = c;
00126         else
00127             PUT_UTF8(mac_to_unicode[c-0x80], t, if (p < end) *p++ = t;);
00128     }
00129     *p = 0;
00130     return p - dst;
00131 }
00132 
00133 static int mov_read_udta_string(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
00134 {
00135 #ifdef MOV_EXPORT_ALL_METADATA
00136     char tmp_key[5];
00137 #endif
00138     char str[1024], key2[16], language[4] = {0};
00139     const char *key = NULL;
00140     uint16_t str_size, langcode = 0;
00141     uint32_t data_type = 0;
00142     int (*parse)(MOVContext*, ByteIOContext*, unsigned) = NULL;
00143 
00144     switch (atom.type) {
00145     case MKTAG(0xa9,'n','a','m'): key = "title";     break;
00146     case MKTAG(0xa9,'a','u','t'):
00147     case MKTAG(0xa9,'A','R','T'): key = "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,'c','m','t'):
00152     case MKTAG(0xa9,'i','n','f'): key = "comment";   break;
00153     case MKTAG(0xa9,'a','l','b'): key = "album";     break;
00154     case MKTAG(0xa9,'d','a','y'): key = "date";      break;
00155     case MKTAG(0xa9,'g','e','n'): key = "genre";     break;
00156     case MKTAG(0xa9,'t','o','o'):
00157     case MKTAG(0xa9,'e','n','c'): key = "encoder";   break;
00158     case MKTAG( 'd','e','s','c'): key = "description";break;
00159     case MKTAG( 'l','d','e','s'): key = "synopsis";  break;
00160     case MKTAG( 't','v','s','h'): key = "show";      break;
00161     case MKTAG( 't','v','e','n'): key = "episode_id";break;
00162     case MKTAG( 't','v','n','n'): key = "network";   break;
00163     case MKTAG( 't','r','k','n'): key = "track";
00164         parse = mov_metadata_trkn; break;
00165     }
00166 
00167     if (c->itunes_metadata && atom.size > 8) {
00168         int data_size = get_be32(pb);
00169         int tag = get_le32(pb);
00170         if (tag == MKTAG('d','a','t','a')) {
00171             data_type = get_be32(pb); // type
00172             get_be32(pb); // unknown
00173             str_size = data_size - 16;
00174             atom.size -= 16;
00175         } else return 0;
00176     } else if (atom.size > 4 && key && !c->itunes_metadata) {
00177         str_size = get_be16(pb); // string length
00178         langcode = get_be16(pb);
00179         ff_mov_lang_to_iso639(langcode, language);
00180         atom.size -= 4;
00181     } else
00182         str_size = atom.size;
00183 
00184 #ifdef MOV_EXPORT_ALL_METADATA
00185     if (!key) {
00186         snprintf(tmp_key, 5, "%.4s", (char*)&atom.type);
00187         key = tmp_key;
00188     }
00189 #endif
00190 
00191     if (!key)
00192         return 0;
00193     if (atom.size < 0)
00194         return -1;
00195 
00196     str_size = FFMIN3(sizeof(str)-1, str_size, atom.size);
00197 
00198     if (parse)
00199         parse(c, pb, str_size);
00200     else {
00201         if (data_type == 3 || (data_type == 0 && langcode < 0x800)) { // MAC Encoded
00202             mov_read_mac_string(c, pb, str_size, str, sizeof(str));
00203         } else {
00204             get_buffer(pb, str, str_size);
00205             str[str_size] = 0;
00206         }
00207         av_metadata_set2(&c->fc->metadata, key, str, 0);
00208         if (*language && strcmp(language, "und")) {
00209             snprintf(key2, sizeof(key2), "%s-%s", key, language);
00210             av_metadata_set2(&c->fc->metadata, key2, str, 0);
00211         }
00212     }
00213 #ifdef DEBUG_METADATA
00214     av_log(c->fc, AV_LOG_DEBUG, "lang \"%3s\" ", language);
00215     av_log(c->fc, AV_LOG_DEBUG, "tag \"%s\" value \"%s\" atom \"%.4s\" %d %lld\n",
00216            key, str, (char*)&atom.type, str_size, atom.size);
00217 #endif
00218 
00219     return 0;
00220 }
00221 
00222 static int mov_read_chpl(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
00223 {
00224     int64_t start;
00225     int i, nb_chapters, str_len;
00226     char str[256+1];
00227 
00228     if ((atom.size -= 5) < 0)
00229         return 0;
00230 
00231     get_be32(pb); // version + flags
00232     get_be32(pb); // ???
00233     nb_chapters = get_byte(pb);
00234 
00235     for (i = 0; i < nb_chapters; i++) {
00236         if (atom.size < 9)
00237             return 0;
00238 
00239         start = get_be64(pb);
00240         str_len = get_byte(pb);
00241 
00242         if ((atom.size -= 9+str_len) < 0)
00243             return 0;
00244 
00245         get_buffer(pb, str, str_len);
00246         str[str_len] = 0;
00247         ff_new_chapter(c->fc, i, (AVRational){1,10000000}, start, AV_NOPTS_VALUE, str);
00248     }
00249     return 0;
00250 }
00251 
00252 static int mov_read_default(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
00253 {
00254     int64_t total_size = 0;
00255     MOVAtom a;
00256     int i;
00257 
00258     if (atom.size < 0)
00259         atom.size = INT64_MAX;
00260     while (total_size + 8 < atom.size && !url_feof(pb)) {
00261         int (*parse)(MOVContext*, ByteIOContext*, MOVAtom) = NULL;
00262         a.size = atom.size;
00263         a.type=0;
00264         if(atom.size >= 8) {
00265             a.size = get_be32(pb);
00266             a.type = get_le32(pb);
00267         }
00268         total_size += 8;
00269         dprintf(c->fc, "type: %08x  %.4s  sz: %"PRIx64"  %"PRIx64"   %"PRIx64"\n",
00270                 a.type, (char*)&a.type, a.size, atom.size, total_size);
00271         if (a.size == 1) { /* 64 bit extended size */
00272             a.size = get_be64(pb) - 8;
00273             total_size += 8;
00274         }
00275         if (a.size == 0) {
00276             a.size = atom.size - total_size;
00277             if (a.size <= 8)
00278                 break;
00279         }
00280         a.size -= 8;
00281         if(a.size < 0)
00282             break;
00283         a.size = FFMIN(a.size, atom.size - total_size);
00284 
00285         for (i = 0; mov_default_parse_table[i].type; i++)
00286             if (mov_default_parse_table[i].type == a.type) {
00287                 parse = mov_default_parse_table[i].parse;
00288                 break;
00289             }
00290 
00291         // container is user data
00292         if (!parse && (atom.type == MKTAG('u','d','t','a') ||
00293                        atom.type == MKTAG('i','l','s','t')))
00294             parse = mov_read_udta_string;
00295 
00296         if (!parse) { /* skip leaf atoms data */
00297             url_fskip(pb, a.size);
00298         } else {
00299             int64_t start_pos = url_ftell(pb);
00300             int64_t left;
00301             int err = parse(c, pb, a);
00302             if (err < 0)
00303                 return err;
00304             if (c->found_moov && c->found_mdat &&
00305                 (url_is_streamed(pb) || start_pos + a.size == url_fsize(pb)))
00306                 return 0;
00307             left = a.size - url_ftell(pb) + start_pos;
00308             if (left > 0) /* skip garbage at atom end */
00309                 url_fskip(pb, left);
00310         }
00311 
00312         total_size += a.size;
00313     }
00314 
00315     if (total_size < atom.size && atom.size < 0x7ffff)
00316         url_fskip(pb, atom.size - total_size);
00317 
00318     return 0;
00319 }
00320 
00321 static int mov_read_dref(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
00322 {
00323     AVStream *st;
00324     MOVStreamContext *sc;
00325     int entries, i, j;
00326 
00327     if (c->fc->nb_streams < 1)
00328         return 0;
00329     st = c->fc->streams[c->fc->nb_streams-1];
00330     sc = st->priv_data;
00331 
00332     get_be32(pb); // version + flags
00333     entries = get_be32(pb);
00334     if (entries >= UINT_MAX / sizeof(*sc->drefs))
00335         return -1;
00336     sc->drefs = av_mallocz(entries * sizeof(*sc->drefs));
00337     if (!sc->drefs)
00338         return AVERROR(ENOMEM);
00339     sc->drefs_count = entries;
00340 
00341     for (i = 0; i < sc->drefs_count; i++) {
00342         MOVDref *dref = &sc->drefs[i];
00343         uint32_t size = get_be32(pb);
00344         int64_t next = url_ftell(pb) + size - 4;
00345 
00346         dref->type = get_le32(pb);
00347         get_be32(pb); // version + flags
00348         dprintf(c->fc, "type %.4s size %d\n", (char*)&dref->type, size);
00349 
00350         if (dref->type == MKTAG('a','l','i','s') && size > 150) {
00351             /* macintosh alias record */
00352             uint16_t volume_len, len;
00353             int16_t type;
00354 
00355             url_fskip(pb, 10);
00356 
00357             volume_len = get_byte(pb);
00358             volume_len = FFMIN(volume_len, 27);
00359             get_buffer(pb, dref->volume, 27);
00360             dref->volume[volume_len] = 0;
00361             av_log(c->fc, AV_LOG_DEBUG, "volume %s, len %d\n", dref->volume, volume_len);
00362 
00363             url_fskip(pb, 12);
00364 
00365             len = get_byte(pb);
00366             len = FFMIN(len, 63);
00367             get_buffer(pb, dref->filename, 63);
00368             dref->filename[len] = 0;
00369             av_log(c->fc, AV_LOG_DEBUG, "filename %s, len %d\n", dref->filename, len);
00370 
00371             url_fskip(pb, 16);
00372 
00373             /* read next level up_from_alias/down_to_target */
00374             dref->nlvl_from = get_be16(pb);
00375             dref->nlvl_to   = get_be16(pb);
00376             av_log(c->fc, AV_LOG_DEBUG, "nlvl from %d, nlvl to %d\n",
00377                    dref->nlvl_from, dref->nlvl_to);
00378 
00379             url_fskip(pb, 16);
00380 
00381             for (type = 0; type != -1 && url_ftell(pb) < next; ) {
00382                 type = get_be16(pb);
00383                 len = get_be16(pb);
00384                 av_log(c->fc, AV_LOG_DEBUG, "type %d, len %d\n", type, len);
00385                 if (len&1)
00386                     len += 1;
00387                 if (type == 2) { // absolute path
00388                     av_free(dref->path);
00389                     dref->path = av_mallocz(len+1);
00390                     if (!dref->path)
00391                         return AVERROR(ENOMEM);
00392                     get_buffer(pb, dref->path, len);
00393                     if (len > volume_len && !strncmp(dref->path, dref->volume, volume_len)) {
00394                         len -= volume_len;
00395                         memmove(dref->path, dref->path+volume_len, len);
00396                         dref->path[len] = 0;
00397                     }
00398                     for (j = 0; j < len; j++)
00399                         if (dref->path[j] == ':')
00400                             dref->path[j] = '/';
00401                     av_log(c->fc, AV_LOG_DEBUG, "path %s\n", dref->path);
00402                 } else if (type == 0) { // directory name
00403                     av_free(dref->dir);
00404                     dref->dir = av_malloc(len+1);
00405                     if (!dref->dir)
00406                         return AVERROR(ENOMEM);
00407                     get_buffer(pb, dref->dir, len);
00408                     dref->dir[len] = 0;
00409                     for (j = 0; j < len; j++)
00410                         if (dref->dir[j] == ':')
00411                             dref->dir[j] = '/';
00412                     av_log(c->fc, AV_LOG_DEBUG, "dir %s\n", dref->dir);
00413                 } else
00414                     url_fskip(pb, len);
00415             }
00416         }
00417         url_fseek(pb, next, SEEK_SET);
00418     }
00419     return 0;
00420 }
00421 
00422 static int mov_read_hdlr(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
00423 {
00424     AVStream *st;
00425     uint32_t type;
00426     uint32_t ctype;
00427 
00428     if (c->fc->nb_streams < 1) // meta before first trak
00429         return 0;
00430 
00431     st = c->fc->streams[c->fc->nb_streams-1];
00432 
00433     get_byte(pb); /* version */
00434     get_be24(pb); /* flags */
00435 
00436     /* component type */
00437     ctype = get_le32(pb);
00438     type = get_le32(pb); /* component subtype */
00439 
00440     dprintf(c->fc, "ctype= %.4s (0x%08x)\n", (char*)&ctype, ctype);
00441     dprintf(c->fc, "stype= %.4s\n", (char*)&type);
00442 
00443     if     (type == MKTAG('v','i','d','e'))
00444         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00445     else if(type == MKTAG('s','o','u','n'))
00446         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00447     else if(type == MKTAG('m','1','a',' '))
00448         st->codec->codec_id = CODEC_ID_MP2;
00449     else if(type == MKTAG('s','u','b','p'))
00450         st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
00451 
00452     get_be32(pb); /* component  manufacture */
00453     get_be32(pb); /* component flags */
00454     get_be32(pb); /* component flags mask */
00455 
00456     return 0;
00457 }
00458 
00459 int ff_mp4_read_descr_len(ByteIOContext *pb)
00460 {
00461     int len = 0;
00462     int count = 4;
00463     while (count--) {
00464         int c = get_byte(pb);
00465         len = (len << 7) | (c & 0x7f);
00466         if (!(c & 0x80))
00467             break;
00468     }
00469     return len;
00470 }
00471 
00472 static int mp4_read_descr(AVFormatContext *fc, ByteIOContext *pb, int *tag)
00473 {
00474     int len;
00475     *tag = get_byte(pb);
00476     len = ff_mp4_read_descr_len(pb);
00477     dprintf(fc, "MPEG4 description: tag=0x%02x len=%d\n", *tag, len);
00478     return len;
00479 }
00480 
00481 #define MP4ESDescrTag                   0x03
00482 #define MP4DecConfigDescrTag            0x04
00483 #define MP4DecSpecificDescrTag          0x05
00484 
00485 static const AVCodecTag mp4_audio_types[] = {
00486     { CODEC_ID_MP3ON4, AOT_PS   }, /* old mp3on4 draft */
00487     { CODEC_ID_MP3ON4, AOT_L1   }, /* layer 1 */
00488     { CODEC_ID_MP3ON4, AOT_L2   }, /* layer 2 */
00489     { CODEC_ID_MP3ON4, AOT_L3   }, /* layer 3 */
00490     { CODEC_ID_MP4ALS, AOT_ALS  }, /* MPEG-4 ALS */
00491     { CODEC_ID_NONE,   AOT_NULL },
00492 };
00493 
00494 int ff_mov_read_esds(AVFormatContext *fc, ByteIOContext *pb, MOVAtom atom)
00495 {
00496     AVStream *st;
00497     int tag, len;
00498 
00499     if (fc->nb_streams < 1)
00500         return 0;
00501     st = fc->streams[fc->nb_streams-1];
00502 
00503     get_be32(pb); /* version + flags */
00504     len = mp4_read_descr(fc, pb, &tag);
00505     if (tag == MP4ESDescrTag) {
00506         get_be16(pb); /* ID */
00507         get_byte(pb); /* priority */
00508     } else
00509         get_be16(pb); /* ID */
00510 
00511     len = mp4_read_descr(fc, pb, &tag);
00512     if (tag == MP4DecConfigDescrTag) {
00513         int object_type_id = get_byte(pb);
00514         get_byte(pb); /* stream type */
00515         get_be24(pb); /* buffer size db */
00516         get_be32(pb); /* max bitrate */
00517         get_be32(pb); /* avg bitrate */
00518 
00519         st->codec->codec_id= ff_codec_get_id(ff_mp4_obj_type, object_type_id);
00520         dprintf(fc, "esds object type id 0x%02x\n", object_type_id);
00521         len = mp4_read_descr(fc, pb, &tag);
00522         if (tag == MP4DecSpecificDescrTag) {
00523             dprintf(fc, "Specific MPEG4 header len=%d\n", len);
00524             if((uint64_t)len > (1<<30))
00525                 return -1;
00526             st->codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
00527             if (!st->codec->extradata)
00528                 return AVERROR(ENOMEM);
00529             get_buffer(pb, st->codec->extradata, len);
00530             st->codec->extradata_size = len;
00531             if (st->codec->codec_id == CODEC_ID_AAC) {
00532                 MPEG4AudioConfig cfg;
00533                 ff_mpeg4audio_get_config(&cfg, st->codec->extradata,
00534                                          st->codec->extradata_size);
00535                 st->codec->channels = cfg.channels;
00536                 if (cfg.object_type == 29 && cfg.sampling_index < 3) // old mp3on4
00537                     st->codec->sample_rate = ff_mpa_freq_tab[cfg.sampling_index];
00538                 else
00539                     st->codec->sample_rate = cfg.sample_rate; // ext sample rate ?
00540                 dprintf(fc, "mp4a config channels %d obj %d ext obj %d "
00541                         "sample rate %d ext sample rate %d\n", st->codec->channels,
00542                         cfg.object_type, cfg.ext_object_type,
00543                         cfg.sample_rate, cfg.ext_sample_rate);
00544                 if (!(st->codec->codec_id = ff_codec_get_id(mp4_audio_types,
00545                                                             cfg.object_type)))
00546                     st->codec->codec_id = CODEC_ID_AAC;
00547             }
00548         }
00549     }
00550     return 0;
00551 }
00552 
00553 static int mov_read_esds(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
00554 {
00555     return ff_mov_read_esds(c->fc, pb, atom);
00556 }
00557 
00558 static int mov_read_pasp(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
00559 {
00560     const int num = get_be32(pb);
00561     const int den = get_be32(pb);
00562     AVStream *st;
00563 
00564     if (c->fc->nb_streams < 1)
00565         return 0;
00566     st = c->fc->streams[c->fc->nb_streams-1];
00567 
00568     if (den != 0) {
00569         if ((st->sample_aspect_ratio.den != 1 || st->sample_aspect_ratio.num) && // default
00570             (den != st->sample_aspect_ratio.den || num != st->sample_aspect_ratio.num))
00571             av_log(c->fc, AV_LOG_WARNING,
00572                    "sample aspect ratio already set to %d:%d, overriding by 'pasp' atom\n",
00573                    st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
00574         st->sample_aspect_ratio.num = num;
00575         st->sample_aspect_ratio.den = den;
00576     }
00577     return 0;
00578 }
00579 
00580 /* this atom contains actual media data */
00581 static int mov_read_mdat(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
00582 {
00583     if(atom.size == 0) /* wrong one (MP4) */
00584         return 0;
00585     c->found_mdat=1;
00586     return 0; /* now go for moov */
00587 }
00588 
00589 /* read major brand, minor version and compatible brands and store them as metadata */
00590 static int mov_read_ftyp(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
00591 {
00592     uint32_t minor_ver;
00593     int comp_brand_size;
00594     char minor_ver_str[11]; /* 32 bit integer -> 10 digits + null */
00595     char* comp_brands_str;
00596     uint8_t type[5] = {0};
00597 
00598     get_buffer(pb, type, 4);
00599     if (strcmp(type, "qt  "))
00600         c->isom = 1;
00601     av_log(c->fc, AV_LOG_DEBUG, "ISO: File Type Major Brand: %.4s\n",(char *)&type);
00602     av_metadata_set2(&c->fc->metadata, "major_brand", type, 0);
00603     minor_ver = get_be32(pb); /* minor version */
00604     snprintf(minor_ver_str, sizeof(minor_ver_str), "%d", minor_ver);
00605     av_metadata_set2(&c->fc->metadata, "minor_version", minor_ver_str, 0);
00606 
00607     comp_brand_size = atom.size - 8;
00608     if (comp_brand_size < 0)
00609         return -1;
00610     comp_brands_str = av_malloc(comp_brand_size + 1); /* Add null terminator */
00611     if (!comp_brands_str)
00612         return AVERROR(ENOMEM);
00613     get_buffer(pb, comp_brands_str, comp_brand_size);
00614     comp_brands_str[comp_brand_size] = 0;
00615     av_metadata_set2(&c->fc->metadata, "compatible_brands", comp_brands_str, 0);
00616     av_freep(&comp_brands_str);
00617 
00618     return 0;
00619 }
00620 
00621 /* this atom should contain all header atoms */
00622 static int mov_read_moov(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
00623 {
00624     if (mov_read_default(c, pb, atom) < 0)
00625         return -1;
00626     /* we parsed the 'moov' atom, we can terminate the parsing as soon as we find the 'mdat' */
00627     /* so we don't parse the whole file if over a network */
00628     c->found_moov=1;
00629     return 0; /* now go for mdat */
00630 }
00631 
00632 static int mov_read_moof(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
00633 {
00634     c->fragment.moof_offset = url_ftell(pb) - 8;
00635     dprintf(c->fc, "moof offset %llx\n", c->fragment.moof_offset);
00636     return mov_read_default(c, pb, atom);
00637 }
00638 
00639 static int mov_read_mdhd(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
00640 {
00641     AVStream *st;
00642     MOVStreamContext *sc;
00643     int version;
00644     char language[4] = {0};
00645     unsigned lang;
00646 
00647     if (c->fc->nb_streams < 1)
00648         return 0;
00649     st = c->fc->streams[c->fc->nb_streams-1];
00650     sc = st->priv_data;
00651 
00652     version = get_byte(pb);
00653     if (version > 1)
00654         return -1; /* unsupported */
00655 
00656     get_be24(pb); /* flags */
00657     if (version == 1) {
00658         get_be64(pb);
00659         get_be64(pb);
00660     } else {
00661         get_be32(pb); /* creation time */
00662         get_be32(pb); /* modification time */
00663     }
00664 
00665     sc->time_scale = get_be32(pb);
00666     st->duration = (version == 1) ? get_be64(pb) : get_be32(pb); /* duration */
00667 
00668     lang = get_be16(pb); /* language */
00669     if (ff_mov_lang_to_iso639(lang, language))
00670         av_metadata_set2(&st->metadata, "language", language, 0);
00671     get_be16(pb); /* quality */
00672 
00673     return 0;
00674 }
00675 
00676 static int mov_read_mvhd(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
00677 {
00678     int version = get_byte(pb); /* version */
00679     get_be24(pb); /* flags */
00680 
00681     if (version == 1) {
00682         get_be64(pb);
00683         get_be64(pb);
00684     } else {
00685         get_be32(pb); /* creation time */
00686         get_be32(pb); /* modification time */
00687     }
00688     c->time_scale = get_be32(pb); /* time scale */
00689 
00690     dprintf(c->fc, "time scale = %i\n", c->time_scale);
00691 
00692     c->duration = (version == 1) ? get_be64(pb) : get_be32(pb); /* duration */
00693     get_be32(pb); /* preferred scale */
00694 
00695     get_be16(pb); /* preferred volume */
00696 
00697     url_fskip(pb, 10); /* reserved */
00698 
00699     url_fskip(pb, 36); /* display matrix */
00700 
00701     get_be32(pb); /* preview time */
00702     get_be32(pb); /* preview duration */
00703     get_be32(pb); /* poster time */
00704     get_be32(pb); /* selection time */
00705     get_be32(pb); /* selection duration */
00706     get_be32(pb); /* current time */
00707     get_be32(pb); /* next track ID */
00708 
00709     return 0;
00710 }
00711 
00712 static int mov_read_smi(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
00713 {
00714     AVStream *st;
00715 
00716     if (c->fc->nb_streams < 1)
00717         return 0;
00718     st = c->fc->streams[c->fc->nb_streams-1];
00719 
00720     if((uint64_t)atom.size > (1<<30))
00721         return -1;
00722 
00723     // currently SVQ3 decoder expect full STSD header - so let's fake it
00724     // this should be fixed and just SMI header should be passed
00725     av_free(st->codec->extradata);
00726     st->codec->extradata = av_mallocz(atom.size + 0x5a + FF_INPUT_BUFFER_PADDING_SIZE);
00727     if (!st->codec->extradata)
00728         return AVERROR(ENOMEM);
00729     st->codec->extradata_size = 0x5a + atom.size;
00730     memcpy(st->codec->extradata, "SVQ3", 4); // fake
00731     get_buffer(pb, st->codec->extradata + 0x5a, atom.size);
00732     dprintf(c->fc, "Reading SMI %"PRId64"  %s\n", atom.size, st->codec->extradata + 0x5a);
00733     return 0;
00734 }
00735 
00736 static int mov_read_enda(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
00737 {
00738     AVStream *st;
00739     int little_endian;
00740 
00741     if (c->fc->nb_streams < 1)
00742         return 0;
00743     st = c->fc->streams[c->fc->nb_streams-1];
00744 
00745     little_endian = get_be16(pb);
00746     dprintf(c->fc, "enda %d\n", little_endian);
00747     if (little_endian == 1) {
00748         switch (st->codec->codec_id) {
00749         case CODEC_ID_PCM_S24BE:
00750             st->codec->codec_id = CODEC_ID_PCM_S24LE;
00751             break;
00752         case CODEC_ID_PCM_S32BE:
00753             st->codec->codec_id = CODEC_ID_PCM_S32LE;
00754             break;
00755         case CODEC_ID_PCM_F32BE:
00756             st->codec->codec_id = CODEC_ID_PCM_F32LE;
00757             break;
00758         case CODEC_ID_PCM_F64BE:
00759             st->codec->codec_id = CODEC_ID_PCM_F64LE;
00760             break;
00761         default:
00762             break;
00763         }
00764     }
00765     return 0;
00766 }
00767 
00768 /* FIXME modify qdm2/svq3/h264 decoders to take full atom as extradata */
00769 static int mov_read_extradata(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
00770 {
00771     AVStream *st;
00772     uint64_t size;
00773     uint8_t *buf;
00774 
00775     if (c->fc->nb_streams < 1) // will happen with jp2 files
00776         return 0;
00777     st= c->fc->streams[c->fc->nb_streams-1];
00778     size= (uint64_t)st->codec->extradata_size + atom.size + 8 + FF_INPUT_BUFFER_PADDING_SIZE;
00779     if(size > INT_MAX || (uint64_t)atom.size > INT_MAX)
00780         return -1;
00781     buf= av_realloc(st->codec->extradata, size);
00782     if(!buf)
00783         return -1;
00784     st->codec->extradata= buf;
00785     buf+= st->codec->extradata_size;
00786     st->codec->extradata_size= size - FF_INPUT_BUFFER_PADDING_SIZE;
00787     AV_WB32(       buf    , atom.size + 8);
00788     AV_WL32(       buf + 4, atom.type);
00789     get_buffer(pb, buf + 8, atom.size);
00790     return 0;
00791 }
00792 
00793 static int mov_read_wave(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
00794 {
00795     AVStream *st;
00796 
00797     if (c->fc->nb_streams < 1)
00798         return 0;
00799     st = c->fc->streams[c->fc->nb_streams-1];
00800 
00801     if((uint64_t)atom.size > (1<<30))
00802         return -1;
00803 
00804     if (st->codec->codec_id == CODEC_ID_QDM2) {
00805         // pass all frma atom to codec, needed at least for QDM2
00806         av_free(st->codec->extradata);
00807         st->codec->extradata = av_mallocz(atom.size + FF_INPUT_BUFFER_PADDING_SIZE);
00808         if (!st->codec->extradata)
00809             return AVERROR(ENOMEM);
00810         st->codec->extradata_size = atom.size;
00811         get_buffer(pb, st->codec->extradata, atom.size);
00812     } else if (atom.size > 8) { /* to read frma, esds atoms */
00813         if (mov_read_default(c, pb, atom) < 0)
00814             return -1;
00815     } else
00816         url_fskip(pb, atom.size);
00817     return 0;
00818 }
00819 
00824 static int mov_read_glbl(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
00825 {
00826     AVStream *st;
00827 
00828     if (c->fc->nb_streams < 1)
00829         return 0;
00830     st = c->fc->streams[c->fc->nb_streams-1];
00831 
00832     if((uint64_t)atom.size > (1<<30))
00833         return -1;
00834 
00835     av_free(st->codec->extradata);
00836     st->codec->extradata = av_mallocz(atom.size + FF_INPUT_BUFFER_PADDING_SIZE);
00837     if (!st->codec->extradata)
00838         return AVERROR(ENOMEM);
00839     st->codec->extradata_size = atom.size;
00840     get_buffer(pb, st->codec->extradata, atom.size);
00841     return 0;
00842 }
00843 
00849 static int mov_read_strf(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
00850 {
00851     AVStream *st;
00852 
00853     if (c->fc->nb_streams < 1)
00854         return 0;
00855     if (atom.size <= 40)
00856         return 0;
00857     st = c->fc->streams[c->fc->nb_streams-1];
00858 
00859     if((uint64_t)atom.size > (1<<30))
00860         return -1;
00861 
00862     av_free(st->codec->extradata);
00863     st->codec->extradata = av_mallocz(atom.size - 40 + FF_INPUT_BUFFER_PADDING_SIZE);
00864     if (!st->codec->extradata)
00865         return AVERROR(ENOMEM);
00866     st->codec->extradata_size = atom.size - 40;
00867     url_fskip(pb, 40);
00868     get_buffer(pb, st->codec->extradata, atom.size - 40);
00869     return 0;
00870 }
00871 
00872 static int mov_read_stco(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
00873 {
00874     AVStream *st;
00875     MOVStreamContext *sc;
00876     unsigned int i, entries;
00877 
00878     if (c->fc->nb_streams < 1)
00879         return 0;
00880     st = c->fc->streams[c->fc->nb_streams-1];
00881     sc = st->priv_data;
00882 
00883     get_byte(pb); /* version */
00884     get_be24(pb); /* flags */
00885 
00886     entries = get_be32(pb);
00887 
00888     if(entries >= UINT_MAX/sizeof(int64_t))
00889         return -1;
00890 
00891     sc->chunk_offsets = av_malloc(entries * sizeof(int64_t));
00892     if (!sc->chunk_offsets)
00893         return AVERROR(ENOMEM);
00894     sc->chunk_count = entries;
00895 
00896     if      (atom.type == MKTAG('s','t','c','o'))
00897         for(i=0; i<entries; i++)
00898             sc->chunk_offsets[i] = get_be32(pb);
00899     else if (atom.type == MKTAG('c','o','6','4'))
00900         for(i=0; i<entries; i++)
00901             sc->chunk_offsets[i] = get_be64(pb);
00902     else
00903         return -1;
00904 
00905     return 0;
00906 }
00907 
00912 enum CodecID ff_mov_get_lpcm_codec_id(int bps, int flags)
00913 {
00914     if (flags & 1) { // floating point
00915         if (flags & 2) { // big endian
00916             if      (bps == 32) return CODEC_ID_PCM_F32BE;
00917             else if (bps == 64) return CODEC_ID_PCM_F64BE;
00918         } else {
00919             if      (bps == 32) return CODEC_ID_PCM_F32LE;
00920             else if (bps == 64) return CODEC_ID_PCM_F64LE;
00921         }
00922     } else {
00923         if (flags & 2) {
00924             if      (bps == 8)
00925                 // signed integer
00926                 if (flags & 4)  return CODEC_ID_PCM_S8;
00927                 else            return CODEC_ID_PCM_U8;
00928             else if (bps == 16) return CODEC_ID_PCM_S16BE;
00929             else if (bps == 24) return CODEC_ID_PCM_S24BE;
00930             else if (bps == 32) return CODEC_ID_PCM_S32BE;
00931         } else {
00932             if      (bps == 8)
00933                 if (flags & 4)  return CODEC_ID_PCM_S8;
00934                 else            return CODEC_ID_PCM_U8;
00935             else if (bps == 16) return CODEC_ID_PCM_S16LE;
00936             else if (bps == 24) return CODEC_ID_PCM_S24LE;
00937             else if (bps == 32) return CODEC_ID_PCM_S32LE;
00938         }
00939     }
00940     return CODEC_ID_NONE;
00941 }
00942 
00943 static int mov_read_stsd(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
00944 {
00945     AVStream *st;
00946     MOVStreamContext *sc;
00947     int j, entries, pseudo_stream_id;
00948 
00949     if (c->fc->nb_streams < 1)
00950         return 0;
00951     st = c->fc->streams[c->fc->nb_streams-1];
00952     sc = st->priv_data;
00953 
00954     get_byte(pb); /* version */
00955     get_be24(pb); /* flags */
00956 
00957     entries = get_be32(pb);
00958 
00959     for(pseudo_stream_id=0; pseudo_stream_id<entries; pseudo_stream_id++) {
00960         //Parsing Sample description table
00961         enum CodecID id;
00962         int dref_id = 1;
00963         MOVAtom a = { 0 };
00964         int64_t start_pos = url_ftell(pb);
00965         int size = get_be32(pb); /* size */
00966         uint32_t format = get_le32(pb); /* data format */
00967 
00968         if (size >= 16) {
00969             get_be32(pb); /* reserved */
00970             get_be16(pb); /* reserved */
00971             dref_id = get_be16(pb);
00972         }
00973 
00974         if (st->codec->codec_tag &&
00975             st->codec->codec_tag != format &&
00976             (c->fc->video_codec_id ? ff_codec_get_id(codec_movvideo_tags, format) != c->fc->video_codec_id
00977                                    : st->codec->codec_tag != MKTAG('j','p','e','g'))
00978            ){
00979             /* Multiple fourcc, we skip JPEG. This is not correct, we should
00980              * export it as a separate AVStream but this needs a few changes
00981              * in the MOV demuxer, patch welcome. */
00982             av_log(c->fc, AV_LOG_WARNING, "multiple fourcc not supported\n");
00983             url_fskip(pb, size - (url_ftell(pb) - start_pos));
00984             continue;
00985         }
00986         sc->pseudo_stream_id = st->codec->codec_tag ? -1 : pseudo_stream_id;
00987         sc->dref_id= dref_id;
00988 
00989         st->codec->codec_tag = format;
00990         id = ff_codec_get_id(codec_movaudio_tags, format);
00991         if (id<=0 && ((format&0xFFFF) == 'm'+('s'<<8) || (format&0xFFFF) == 'T'+('S'<<8)))
00992             id = ff_codec_get_id(ff_codec_wav_tags, bswap_32(format)&0xFFFF);
00993 
00994         if (st->codec->codec_type != AVMEDIA_TYPE_VIDEO && id > 0) {
00995             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00996         } else if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO && /* do not overwrite codec type */
00997                    format && format != MKTAG('m','p','4','s')) { /* skip old asf mpeg4 tag */
00998             id = ff_codec_get_id(codec_movvideo_tags, format);
00999             if (id <= 0)
01000                 id = ff_codec_get_id(ff_codec_bmp_tags, format);
01001             if (id > 0)
01002                 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
01003             else if(st->codec->codec_type == AVMEDIA_TYPE_DATA){
01004                 id = ff_codec_get_id(ff_codec_movsubtitle_tags, format);
01005                 if(id > 0)
01006                     st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
01007             }
01008         }
01009 
01010         dprintf(c->fc, "size=%d 4CC= %c%c%c%c codec_type=%d\n", size,
01011                 (format >> 0) & 0xff, (format >> 8) & 0xff, (format >> 16) & 0xff,
01012                 (format >> 24) & 0xff, st->codec->codec_type);
01013 
01014         if(st->codec->codec_type==AVMEDIA_TYPE_VIDEO) {
01015             unsigned int color_depth, len;
01016             int color_greyscale;
01017 
01018             st->codec->codec_id = id;
01019             get_be16(pb); /* version */
01020             get_be16(pb); /* revision level */
01021             get_be32(pb); /* vendor */
01022             get_be32(pb); /* temporal quality */
01023             get_be32(pb); /* spatial quality */
01024 
01025             st->codec->width = get_be16(pb); /* width */
01026             st->codec->height = get_be16(pb); /* height */
01027 
01028             get_be32(pb); /* horiz resolution */
01029             get_be32(pb); /* vert resolution */
01030             get_be32(pb); /* data size, always 0 */
01031             get_be16(pb); /* frames per samples */
01032 
01033             len = get_byte(pb); /* codec name, pascal string */
01034             if (len > 31)
01035                 len = 31;
01036             mov_read_mac_string(c, pb, len, st->codec->codec_name, 32);
01037             if (len < 31)
01038                 url_fskip(pb, 31 - len);
01039             /* codec_tag YV12 triggers an UV swap in rawdec.c */
01040             if (!memcmp(st->codec->codec_name, "Planar Y'CbCr 8-bit 4:2:0", 25))
01041                 st->codec->codec_tag=MKTAG('I', '4', '2', '0');
01042 
01043             st->codec->bits_per_coded_sample = get_be16(pb); /* depth */
01044             st->codec->color_table_id = get_be16(pb); /* colortable id */
01045             dprintf(c->fc, "depth %d, ctab id %d\n",
01046                    st->codec->bits_per_coded_sample, st->codec->color_table_id);
01047             /* figure out the palette situation */
01048             color_depth = st->codec->bits_per_coded_sample & 0x1F;
01049             color_greyscale = st->codec->bits_per_coded_sample & 0x20;
01050 
01051             /* if the depth is 2, 4, or 8 bpp, file is palettized */
01052             if ((color_depth == 2) || (color_depth == 4) ||
01053                 (color_depth == 8)) {
01054                 /* for palette traversal */
01055                 unsigned int color_start, color_count, color_end;
01056                 unsigned char r, g, b;
01057 
01058                 st->codec->palctrl = av_malloc(sizeof(*st->codec->palctrl));
01059                 if (color_greyscale) {
01060                     int color_index, color_dec;
01061                     /* compute the greyscale palette */
01062                     st->codec->bits_per_coded_sample = color_depth;
01063                     color_count = 1 << color_depth;
01064                     color_index = 255;
01065                     color_dec = 256 / (color_count - 1);
01066                     for (j = 0; j < color_count; j++) {
01067                         r = g = b = color_index;
01068                         st->codec->palctrl->palette[j] =
01069                             (r << 16) | (g << 8) | (b);
01070                         color_index -= color_dec;
01071                         if (color_index < 0)
01072                             color_index = 0;
01073                     }
01074                 } else if (st->codec->color_table_id) {
01075                     const uint8_t *color_table;
01076                     /* if flag bit 3 is set, use the default palette */
01077                     color_count = 1 << color_depth;
01078                     if (color_depth == 2)
01079                         color_table = ff_qt_default_palette_4;
01080                     else if (color_depth == 4)
01081                         color_table = ff_qt_default_palette_16;
01082                     else
01083                         color_table = ff_qt_default_palette_256;
01084 
01085                     for (j = 0; j < color_count; j++) {
01086                         r = color_table[j * 3 + 0];
01087                         g = color_table[j * 3 + 1];
01088                         b = color_table[j * 3 + 2];
01089                         st->codec->palctrl->palette[j] =
01090                             (r << 16) | (g << 8) | (b);
01091                     }
01092                 } else {
01093                     /* load the palette from the file */
01094                     color_start = get_be32(pb);
01095                     color_count = get_be16(pb);
01096                     color_end = get_be16(pb);
01097                     if ((color_start <= 255) &&
01098                         (color_end <= 255)) {
01099                         for (j = color_start; j <= color_end; j++) {
01100                             /* each R, G, or B component is 16 bits;
01101                              * only use the top 8 bits; skip alpha bytes
01102                              * up front */
01103                             get_byte(pb);
01104                             get_byte(pb);
01105                             r = get_byte(pb);
01106                             get_byte(pb);
01107                             g = get_byte(pb);
01108                             get_byte(pb);
01109                             b = get_byte(pb);
01110                             get_byte(pb);
01111                             st->codec->palctrl->palette[j] =
01112                                 (r << 16) | (g << 8) | (b);
01113                         }
01114                     }
01115                 }
01116                 st->codec->palctrl->palette_changed = 1;
01117             }
01118         } else if(st->codec->codec_type==AVMEDIA_TYPE_AUDIO) {
01119             int bits_per_sample, flags;
01120             uint16_t version = get_be16(pb);
01121 
01122             st->codec->codec_id = id;
01123             get_be16(pb); /* revision level */
01124             get_be32(pb); /* vendor */
01125 
01126             st->codec->channels = get_be16(pb);             /* channel count */
01127             dprintf(c->fc, "audio channels %d\n", st->codec->channels);
01128             st->codec->bits_per_coded_sample = get_be16(pb);      /* sample size */
01129 
01130             sc->audio_cid = get_be16(pb);
01131             get_be16(pb); /* packet size = 0 */
01132 
01133             st->codec->sample_rate = ((get_be32(pb) >> 16));
01134 
01135             //Read QT version 1 fields. In version 0 these do not exist.
01136             dprintf(c->fc, "version =%d, isom =%d\n",version,c->isom);
01137             if(!c->isom) {
01138                 if(version==1) {
01139                     sc->samples_per_frame = get_be32(pb);
01140                     get_be32(pb); /* bytes per packet */
01141                     sc->bytes_per_frame = get_be32(pb);
01142                     get_be32(pb); /* bytes per sample */
01143                 } else if(version==2) {
01144                     get_be32(pb); /* sizeof struct only */
01145                     st->codec->sample_rate = av_int2dbl(get_be64(pb)); /* float 64 */
01146                     st->codec->channels = get_be32(pb);
01147                     get_be32(pb); /* always 0x7F000000 */
01148                     st->codec->bits_per_coded_sample = get_be32(pb); /* bits per channel if sound is uncompressed */
01149                     flags = get_be32(pb); /* lpcm format specific flag */
01150                     sc->bytes_per_frame = get_be32(pb); /* bytes per audio packet if constant */
01151                     sc->samples_per_frame = get_be32(pb); /* lpcm frames per audio packet if constant */
01152                     if (format == MKTAG('l','p','c','m'))
01153                         st->codec->codec_id = ff_mov_get_lpcm_codec_id(st->codec->bits_per_coded_sample, flags);
01154                 }
01155             }
01156 
01157             switch (st->codec->codec_id) {
01158             case CODEC_ID_PCM_S8:
01159             case CODEC_ID_PCM_U8:
01160                 if (st->codec->bits_per_coded_sample == 16)
01161                     st->codec->codec_id = CODEC_ID_PCM_S16BE;
01162                 break;
01163             case CODEC_ID_PCM_S16LE:
01164             case CODEC_ID_PCM_S16BE:
01165                 if (st->codec->bits_per_coded_sample == 8)
01166                     st->codec->codec_id = CODEC_ID_PCM_S8;
01167                 else if (st->codec->bits_per_coded_sample == 24)
01168                     st->codec->codec_id =
01169                         st->codec->codec_id == CODEC_ID_PCM_S16BE ?
01170                         CODEC_ID_PCM_S24BE : CODEC_ID_PCM_S24LE;
01171                 break;
01172             /* set values for old format before stsd version 1 appeared */
01173             case CODEC_ID_MACE3:
01174                 sc->samples_per_frame = 6;
01175                 sc->bytes_per_frame = 2*st->codec->channels;
01176                 break;
01177             case CODEC_ID_MACE6:
01178                 sc->samples_per_frame = 6;
01179                 sc->bytes_per_frame = 1*st->codec->channels;
01180                 break;
01181             case CODEC_ID_ADPCM_IMA_QT:
01182                 sc->samples_per_frame = 64;
01183                 sc->bytes_per_frame = 34*st->codec->channels;
01184                 break;
01185             case CODEC_ID_GSM:
01186                 sc->samples_per_frame = 160;
01187                 sc->bytes_per_frame = 33;
01188                 break;
01189             default:
01190                 break;
01191             }
01192 
01193             bits_per_sample = av_get_bits_per_sample(st->codec->codec_id);
01194             if (bits_per_sample) {
01195                 st->codec->bits_per_coded_sample = bits_per_sample;
01196                 sc->sample_size = (bits_per_sample >> 3) * st->codec->channels;
01197             }
01198         } else if(st->codec->codec_type==AVMEDIA_TYPE_SUBTITLE){
01199             // ttxt stsd contains display flags, justification, background
01200             // color, fonts, and default styles, so fake an atom to read it
01201             MOVAtom fake_atom = { .size = size - (url_ftell(pb) - start_pos) };
01202             if (format != AV_RL32("mp4s")) // mp4s contains a regular esds atom
01203                 mov_read_glbl(c, pb, fake_atom);
01204             st->codec->codec_id= id;
01205             st->codec->width = sc->width;
01206             st->codec->height = sc->height;
01207         } else {
01208             /* other codec type, just skip (rtp, mp4s, tmcd ...) */
01209             url_fskip(pb, size - (url_ftell(pb) - start_pos));
01210         }
01211         /* this will read extra atoms at the end (wave, alac, damr, avcC, SMI ...) */
01212         a.size = size - (url_ftell(pb) - start_pos);
01213         if (a.size > 8) {
01214             if (mov_read_default(c, pb, a) < 0)
01215                 return -1;
01216         } else if (a.size > 0)
01217             url_fskip(pb, a.size);
01218     }
01219 
01220     if(st->codec->codec_type==AVMEDIA_TYPE_AUDIO && st->codec->sample_rate==0 && sc->time_scale>1)
01221         st->codec->sample_rate= sc->time_scale;
01222 
01223     /* special codec parameters handling */
01224     switch (st->codec->codec_id) {
01225 #if CONFIG_DV_DEMUXER
01226     case CODEC_ID_DVAUDIO:
01227         c->dv_fctx = avformat_alloc_context();
01228         c->dv_demux = dv_init_demux(c->dv_fctx);
01229         if (!c->dv_demux) {
01230             av_log(c->fc, AV_LOG_ERROR, "dv demux context init error\n");
01231             return -1;
01232         }
01233         sc->dv_audio_container = 1;
01234         st->codec->codec_id = CODEC_ID_PCM_S16LE;
01235         break;
01236 #endif
01237     /* no ifdef since parameters are always those */
01238     case CODEC_ID_QCELP:
01239         // force sample rate for qcelp when not stored in mov
01240         if (st->codec->codec_tag != MKTAG('Q','c','l','p'))
01241             st->codec->sample_rate = 8000;
01242         st->codec->frame_size= 160;
01243         st->codec->channels= 1; /* really needed */
01244         break;
01245     case CODEC_ID_AMR_NB:
01246     case CODEC_ID_AMR_WB:
01247         st->codec->frame_size= sc->samples_per_frame;
01248         st->codec->channels= 1; /* really needed */
01249         /* force sample rate for amr, stsd in 3gp does not store sample rate */
01250         if (st->codec->codec_id == CODEC_ID_AMR_NB)
01251             st->codec->sample_rate = 8000;
01252         else if (st->codec->codec_id == CODEC_ID_AMR_WB)
01253             st->codec->sample_rate = 16000;
01254         break;
01255     case CODEC_ID_MP2:
01256     case CODEC_ID_MP3:
01257         st->codec->codec_type = AVMEDIA_TYPE_AUDIO; /* force type after stsd for m1a hdlr */
01258         st->need_parsing = AVSTREAM_PARSE_FULL;
01259         break;
01260     case CODEC_ID_GSM:
01261     case CODEC_ID_ADPCM_MS:
01262     case CODEC_ID_ADPCM_IMA_WAV:
01263         st->codec->block_align = sc->bytes_per_frame;
01264         break;
01265     case CODEC_ID_ALAC:
01266         if (st->codec->extradata_size == 36) {
01267             st->codec->frame_size = AV_RB32(st->codec->extradata+12);
01268             st->codec->channels   = AV_RB8 (st->codec->extradata+21);
01269         }
01270         break;
01271     default:
01272         break;
01273     }
01274 
01275     return 0;
01276 }
01277 
01278 static int mov_read_stsc(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
01279 {
01280     AVStream *st;
01281     MOVStreamContext *sc;
01282     unsigned int i, entries;
01283 
01284     if (c->fc->nb_streams < 1)
01285         return 0;
01286     st = c->fc->streams[c->fc->nb_streams-1];
01287     sc = st->priv_data;
01288 
01289     get_byte(pb); /* version */
01290     get_be24(pb); /* flags */
01291 
01292     entries = get_be32(pb);
01293 
01294     dprintf(c->fc, "track[%i].stsc.entries = %i\n", c->fc->nb_streams-1, entries);
01295 
01296     if(entries >= UINT_MAX / sizeof(*sc->stsc_data))
01297         return -1;
01298     sc->stsc_data = av_malloc(entries * sizeof(*sc->stsc_data));
01299     if (!sc->stsc_data)
01300         return AVERROR(ENOMEM);
01301     sc->stsc_count = entries;
01302 
01303     for(i=0; i<entries; i++) {
01304         sc->stsc_data[i].first = get_be32(pb);
01305         sc->stsc_data[i].count = get_be32(pb);
01306         sc->stsc_data[i].id = get_be32(pb);
01307     }
01308     return 0;
01309 }
01310 
01311 static int mov_read_stps(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
01312 {
01313     AVStream *st;
01314     MOVStreamContext *sc;
01315     unsigned i, entries;
01316 
01317     if (c->fc->nb_streams < 1)
01318         return 0;
01319     st = c->fc->streams[c->fc->nb_streams-1];
01320     sc = st->priv_data;
01321 
01322     get_be32(pb); // version + flags
01323 
01324     entries = get_be32(pb);
01325     if (entries >= UINT_MAX / sizeof(*sc->stps_data))
01326         return -1;
01327     sc->stps_data = av_malloc(entries * sizeof(*sc->stps_data));
01328     if (!sc->stps_data)
01329         return AVERROR(ENOMEM);
01330     sc->stps_count = entries;
01331 
01332     for (i = 0; i < entries; i++) {
01333         sc->stps_data[i] = get_be32(pb);
01334         //dprintf(c->fc, "stps %d\n", sc->stps_data[i]);
01335     }
01336 
01337     return 0;
01338 }
01339 
01340 static int mov_read_stss(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
01341 {
01342     AVStream *st;
01343     MOVStreamContext *sc;
01344     unsigned int i, entries;
01345 
01346     if (c->fc->nb_streams < 1)
01347         return 0;
01348     st = c->fc->streams[c->fc->nb_streams-1];
01349     sc = st->priv_data;
01350 
01351     get_byte(pb); /* version */
01352     get_be24(pb); /* flags */
01353 
01354     entries = get_be32(pb);
01355 
01356     dprintf(c->fc, "keyframe_count = %d\n", entries);
01357 
01358     if(entries >= UINT_MAX / sizeof(int))
01359         return -1;
01360     sc->keyframes = av_malloc(entries * sizeof(int));
01361     if (!sc->keyframes)
01362         return AVERROR(ENOMEM);
01363     sc->keyframe_count = entries;
01364 
01365     for(i=0; i<entries; i++) {
01366         sc->keyframes[i] = get_be32(pb);
01367         //dprintf(c->fc, "keyframes[]=%d\n", sc->keyframes[i]);
01368     }
01369     return 0;
01370 }
01371 
01372 static int mov_read_stsz(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
01373 {
01374     AVStream *st;
01375     MOVStreamContext *sc;
01376     unsigned int i, entries, sample_size, field_size, num_bytes;
01377     GetBitContext gb;
01378     unsigned char* buf;
01379 
01380     if (c->fc->nb_streams < 1)
01381         return 0;
01382     st = c->fc->streams[c->fc->nb_streams-1];
01383     sc = st->priv_data;
01384 
01385     get_byte(pb); /* version */
01386     get_be24(pb); /* flags */
01387 
01388     if (atom.type == MKTAG('s','t','s','z')) {
01389         sample_size = get_be32(pb);
01390         if (!sc->sample_size) /* do not overwrite value computed in stsd */
01391             sc->sample_size = sample_size;
01392         field_size = 32;
01393     } else {
01394         sample_size = 0;
01395         get_be24(pb); /* reserved */
01396         field_size = get_byte(pb);
01397     }
01398     entries = get_be32(pb);
01399 
01400     dprintf(c->fc, "sample_size = %d sample_count = %d\n", sc->sample_size, entries);
01401 
01402     sc->sample_count = entries;
01403     if (sample_size)
01404         return 0;
01405 
01406     if (field_size != 4 && field_size != 8 && field_size != 16 && field_size != 32) {
01407         av_log(c->fc, AV_LOG_ERROR, "Invalid sample field size %d\n", field_size);
01408         return -1;
01409     }
01410 
01411     if (entries >= UINT_MAX / sizeof(int) || entries >= (UINT_MAX - 4) / field_size)
01412         return -1;
01413     sc->sample_sizes = av_malloc(entries * sizeof(int));
01414     if (!sc->sample_sizes)
01415         return AVERROR(ENOMEM);
01416 
01417     num_bytes = (entries*field_size+4)>>3;
01418 
01419     buf = av_malloc(num_bytes+FF_INPUT_BUFFER_PADDING_SIZE);
01420     if (!buf) {
01421         av_freep(&sc->sample_sizes);
01422         return AVERROR(ENOMEM);
01423     }
01424 
01425     if (get_buffer(pb, buf, num_bytes) < num_bytes) {
01426         av_freep(&sc->sample_sizes);
01427         av_free(buf);
01428         return -1;
01429     }
01430 
01431     init_get_bits(&gb, buf, 8*num_bytes);
01432 
01433     for(i=0; i<entries; i++)
01434         sc->sample_sizes[i] = get_bits_long(&gb, field_size);
01435 
01436     av_free(buf);
01437     return 0;
01438 }
01439 
01440 static int mov_read_stts(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
01441 {
01442     AVStream *st;
01443     MOVStreamContext *sc;
01444     unsigned int i, entries;
01445     int64_t duration=0;
01446     int64_t total_sample_count=0;
01447 
01448     if (c->fc->nb_streams < 1)
01449         return 0;
01450     st = c->fc->streams[c->fc->nb_streams-1];
01451     sc = st->priv_data;
01452 
01453     get_byte(pb); /* version */
01454     get_be24(pb); /* flags */
01455     entries = get_be32(pb);
01456 
01457     dprintf(c->fc, "track[%i].stts.entries = %i\n", c->fc->nb_streams-1, entries);
01458 
01459     if(entries >= UINT_MAX / sizeof(*sc->stts_data))
01460         return -1;
01461     sc->stts_data = av_malloc(entries * sizeof(*sc->stts_data));
01462     if (!sc->stts_data)
01463         return AVERROR(ENOMEM);
01464     sc->stts_count = entries;
01465 
01466     for(i=0; i<entries; i++) {
01467         int sample_duration;
01468         int sample_count;
01469 
01470         sample_count=get_be32(pb);
01471         sample_duration = get_be32(pb);
01472         sc->stts_data[i].count= sample_count;
01473         sc->stts_data[i].duration= sample_duration;
01474 
01475         dprintf(c->fc, "sample_count=%d, sample_duration=%d\n",sample_count,sample_duration);
01476 
01477         duration+=(int64_t)sample_duration*sample_count;
01478         total_sample_count+=sample_count;
01479     }
01480 
01481     st->nb_frames= total_sample_count;
01482     if(duration)
01483         st->duration= duration;
01484     return 0;
01485 }
01486 
01487 static int mov_read_ctts(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
01488 {
01489     AVStream *st;
01490     MOVStreamContext *sc;
01491     unsigned int i, entries;
01492 
01493     if (c->fc->nb_streams < 1)
01494         return 0;
01495     st = c->fc->streams[c->fc->nb_streams-1];
01496     sc = st->priv_data;
01497 
01498     get_byte(pb); /* version */
01499     get_be24(pb); /* flags */
01500     entries = get_be32(pb);
01501 
01502     dprintf(c->fc, "track[%i].ctts.entries = %i\n", c->fc->nb_streams-1, entries);
01503 
01504     if(entries >= UINT_MAX / sizeof(*sc->ctts_data))
01505         return -1;
01506     sc->ctts_data = av_malloc(entries * sizeof(*sc->ctts_data));
01507     if (!sc->ctts_data)
01508         return AVERROR(ENOMEM);
01509     sc->ctts_count = entries;
01510 
01511     for(i=0; i<entries; i++) {
01512         int count    =get_be32(pb);
01513         int duration =get_be32(pb);
01514 
01515         sc->ctts_data[i].count   = count;
01516         sc->ctts_data[i].duration= duration;
01517         if (duration < 0)
01518             sc->dts_shift = FFMAX(sc->dts_shift, -duration);
01519     }
01520 
01521     dprintf(c->fc, "dts shift %d\n", sc->dts_shift);
01522 
01523     return 0;
01524 }
01525 
01526 static void mov_build_index(MOVContext *mov, AVStream *st)
01527 {
01528     MOVStreamContext *sc = st->priv_data;
01529     int64_t current_offset;
01530     int64_t current_dts = 0;
01531     unsigned int stts_index = 0;
01532     unsigned int stsc_index = 0;
01533     unsigned int stss_index = 0;
01534     unsigned int stps_index = 0;
01535     unsigned int i, j;
01536     uint64_t stream_size = 0;
01537 
01538     /* adjust first dts according to edit list */
01539     if (sc->time_offset) {
01540         int rescaled = sc->time_offset < 0 ? av_rescale(sc->time_offset, sc->time_scale, mov->time_scale) : sc->time_offset;
01541         current_dts = -rescaled;
01542         if (sc->ctts_data && sc->ctts_data[0].duration / sc->stts_data[0].duration > 16) {
01543             /* more than 16 frames delay, dts are likely wrong
01544                this happens with files created by iMovie */
01545             sc->wrong_dts = 1;
01546             st->codec->has_b_frames = 1;
01547         }
01548     }
01549 
01550     /* only use old uncompressed audio chunk demuxing when stts specifies it */
01551     if (!(st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
01552           sc->stts_count == 1 && sc->stts_data[0].duration == 1)) {
01553         unsigned int current_sample = 0;
01554         unsigned int stts_sample = 0;
01555         unsigned int sample_size;
01556         unsigned int distance = 0;
01557         int key_off = sc->keyframes && sc->keyframes[0] == 1;
01558 
01559         current_dts -= sc->dts_shift;
01560 
01561         if (sc->sample_count >= UINT_MAX / sizeof(*st->index_entries))
01562             return;
01563         st->index_entries = av_malloc(sc->sample_count*sizeof(*st->index_entries));
01564         if (!st->index_entries)
01565             return;
01566         st->index_entries_allocated_size = sc->sample_count*sizeof(*st->index_entries);
01567 
01568         for (i = 0; i < sc->chunk_count; i++) {
01569             current_offset = sc->chunk_offsets[i];
01570             if (stsc_index + 1 < sc->stsc_count &&
01571                 i + 1 == sc->stsc_data[stsc_index + 1].first)
01572                 stsc_index++;
01573             for (j = 0; j < sc->stsc_data[stsc_index].count; j++) {
01574                 int keyframe = 0;
01575                 if (current_sample >= sc->sample_count) {
01576                     av_log(mov->fc, AV_LOG_ERROR, "wrong sample count\n");
01577                     return;
01578                 }
01579 
01580                 if (!sc->keyframe_count || current_sample+key_off == sc->keyframes[stss_index]) {
01581                     keyframe = 1;
01582                     if (stss_index + 1 < sc->keyframe_count)
01583                         stss_index++;
01584                 } else if (sc->stps_count && current_sample+key_off == sc->stps_data[stps_index]) {
01585                     keyframe = 1;
01586                     if (stps_index + 1 < sc->stps_count)
01587                         stps_index++;
01588                 }
01589                 if (keyframe)
01590                     distance = 0;
01591                 sample_size = sc->sample_size > 0 ? sc->sample_size : sc->sample_sizes[current_sample];
01592                 if(sc->pseudo_stream_id == -1 ||
01593                    sc->stsc_data[stsc_index].id - 1 == sc->pseudo_stream_id) {
01594                     AVIndexEntry *e = &st->index_entries[st->nb_index_entries++];
01595                     e->pos = current_offset;
01596                     e->timestamp = current_dts;
01597                     e->size = sample_size;
01598                     e->min_distance = distance;
01599                     e->flags = keyframe ? AVINDEX_KEYFRAME : 0;
01600                     dprintf(mov->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "
01601                             "size %d, distance %d, keyframe %d\n", st->index, current_sample,
01602                             current_offset, current_dts, sample_size, distance, keyframe);
01603                 }
01604 
01605                 current_offset += sample_size;
01606                 stream_size += sample_size;
01607                 current_dts += sc->stts_data[stts_index].duration;
01608                 distance++;
01609                 stts_sample++;
01610                 current_sample++;
01611                 if (stts_index + 1 < sc->stts_count && stts_sample == sc->stts_data[stts_index].count) {
01612                     stts_sample = 0;
01613                     stts_index++;
01614                 }
01615             }
01616         }
01617         if (st->duration > 0)
01618             st->codec->bit_rate = stream_size*8*sc->time_scale/st->duration;
01619     } else {
01620         unsigned chunk_samples, total = 0;
01621 
01622         // compute total chunk count
01623         for (i = 0; i < sc->stsc_count; i++) {
01624             unsigned count, chunk_count;
01625 
01626             chunk_samples = sc->stsc_data[i].count;
01627             if (sc->samples_per_frame && chunk_samples % sc->samples_per_frame) {
01628                 av_log(mov->fc, AV_LOG_ERROR, "error unaligned chunk\n");
01629                 return;
01630             }
01631 
01632             if (sc->samples_per_frame >= 160) { // gsm
01633                 count = chunk_samples / sc->samples_per_frame;
01634             } else if (sc->samples_per_frame > 1) {
01635                 unsigned samples = (1024/sc->samples_per_frame)*sc->samples_per_frame;
01636                 count = (chunk_samples+samples-1) / samples;
01637             } else {
01638                 count = (chunk_samples+1023) / 1024;
01639             }
01640 
01641             if (i < sc->stsc_count - 1)
01642                 chunk_count = sc->stsc_data[i+1].first - sc->stsc_data[i].first;
01643             else
01644                 chunk_count = sc->chunk_count - (sc->stsc_data[i].first - 1);
01645             total += chunk_count * count;
01646         }
01647 
01648         dprintf(mov->fc, "chunk count %d\n", total);
01649         if (total >= UINT_MAX / sizeof(*st->index_entries))
01650             return;
01651         st->index_entries = av_malloc(total*sizeof(*st->index_entries));
01652         if (!st->index_entries)
01653             return;
01654         st->index_entries_allocated_size = total*sizeof(*st->index_entries);
01655 
01656         // populate index
01657         for (i = 0; i < sc->chunk_count; i++) {
01658             current_offset = sc->chunk_offsets[i];
01659             if (stsc_index + 1 < sc->stsc_count &&
01660                 i + 1 == sc->stsc_data[stsc_index + 1].first)
01661                 stsc_index++;
01662             chunk_samples = sc->stsc_data[stsc_index].count;
01663 
01664             while (chunk_samples > 0) {
01665                 AVIndexEntry *e;
01666                 unsigned size, samples;
01667 
01668                 if (sc->samples_per_frame >= 160) { // gsm
01669                     samples = sc->samples_per_frame;
01670                     size = sc->bytes_per_frame;
01671                 } else {
01672                     if (sc->samples_per_frame > 1) {
01673                         samples = FFMIN((1024 / sc->samples_per_frame)*
01674                                         sc->samples_per_frame, chunk_samples);
01675                         size = (samples / sc->samples_per_frame) * sc->bytes_per_frame;
01676                     } else {
01677                         samples = FFMIN(1024, chunk_samples);
01678                         size = samples * sc->sample_size;
01679                     }
01680                 }
01681 
01682                 if (st->nb_index_entries >= total) {
01683                     av_log(mov->fc, AV_LOG_ERROR, "wrong chunk count %d\n", total);
01684                     return;
01685                 }
01686                 e = &st->index_entries[st->nb_index_entries++];
01687                 e->pos = current_offset;
01688                 e->timestamp = current_dts;
01689                 e->size = size;
01690                 e->min_distance = 0;
01691                 e->flags = AVINDEX_KEYFRAME;
01692                 dprintf(mov->fc, "AVIndex stream %d, chunk %d, offset %"PRIx64", dts %"PRId64", "
01693                         "size %d, duration %d\n", st->index, i, current_offset, current_dts,
01694                         size, samples);
01695 
01696                 current_offset += size;
01697                 current_dts += samples;
01698                 chunk_samples -= samples;
01699             }
01700         }
01701     }
01702 }
01703 
01704 static int mov_open_dref(ByteIOContext **pb, char *src, MOVDref *ref)
01705 {
01706     /* try relative path, we do not try the absolute because it can leak information about our
01707        system to an attacker */
01708     if (ref->nlvl_to > 0 && ref->nlvl_from > 0) {
01709         char filename[1024];
01710         char *src_path;
01711         int i, l;
01712 
01713         /* find a source dir */
01714         src_path = strrchr(src, '/');
01715         if (src_path)
01716             src_path++;
01717         else
01718             src_path = src;
01719 
01720         /* find a next level down to target */
01721         for (i = 0, l = strlen(ref->path) - 1; l >= 0; l--)
01722             if (ref->path[l] == '/') {
01723                 if (i == ref->nlvl_to - 1)
01724                     break;
01725                 else
01726                     i++;
01727             }
01728 
01729         /* compose filename if next level down to target was found */
01730         if (i == ref->nlvl_to - 1 && src_path - src  < sizeof(filename)) {
01731             memcpy(filename, src, src_path - src);
01732             filename[src_path - src] = 0;
01733 
01734             for (i = 1; i < ref->nlvl_from; i++)
01735                 av_strlcat(filename, "../", 1024);
01736 
01737             av_strlcat(filename, ref->path + l + 1, 1024);
01738 
01739             if (!url_fopen(pb, filename, URL_RDONLY))
01740                 return 0;
01741         }
01742     }
01743 
01744     return AVERROR(ENOENT);
01745 };
01746 
01747 static int mov_read_trak(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
01748 {
01749     AVStream *st;
01750     MOVStreamContext *sc;
01751     int ret;
01752 
01753     st = av_new_stream(c->fc, c->fc->nb_streams);
01754     if (!st) return AVERROR(ENOMEM);
01755     sc = av_mallocz(sizeof(MOVStreamContext));
01756     if (!sc) return AVERROR(ENOMEM);
01757 
01758     st->priv_data = sc;
01759     st->codec->codec_type = AVMEDIA_TYPE_DATA;
01760     sc->ffindex = st->index;
01761 
01762     if ((ret = mov_read_default(c, pb, atom)) < 0)
01763         return ret;
01764 
01765     /* sanity checks */
01766     if (sc->chunk_count && (!sc->stts_count || !sc->stsc_count ||
01767                             (!sc->sample_size && !sc->sample_count))) {
01768         av_log(c->fc, AV_LOG_ERROR, "stream %d, missing mandatory atoms, broken header\n",
01769                st->index);
01770         return 0;
01771     }
01772 
01773     if (!sc->time_scale) {
01774         av_log(c->fc, AV_LOG_WARNING, "stream %d, timescale not set\n", st->index);
01775         sc->time_scale = c->time_scale;
01776         if (!sc->time_scale)
01777             sc->time_scale = 1;
01778     }
01779 
01780     av_set_pts_info(st, 64, 1, sc->time_scale);
01781 
01782     if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
01783         !st->codec->frame_size && sc->stts_count == 1) {
01784         st->codec->frame_size = av_rescale(sc->stts_data[0].duration,
01785                                            st->codec->sample_rate, sc->time_scale);
01786         dprintf(c->fc, "frame size %d\n", st->codec->frame_size);
01787     }
01788 
01789     mov_build_index(c, st);
01790 
01791     if (sc->dref_id-1 < sc->drefs_count && sc->drefs[sc->dref_id-1].path) {
01792         MOVDref *dref = &sc->drefs[sc->dref_id - 1];
01793         if (mov_open_dref(&sc->pb, c->fc->filename, dref) < 0)
01794             av_log(c->fc, AV_LOG_ERROR,
01795                    "stream %d, error opening alias: path='%s', dir='%s', "
01796                    "filename='%s', volume='%s', nlvl_from=%d, nlvl_to=%d\n",
01797                    st->index, dref->path, dref->dir, dref->filename,
01798                    dref->volume, dref->nlvl_from, dref->nlvl_to);
01799     } else
01800         sc->pb = c->fc->pb;
01801 
01802     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
01803         if (st->codec->width != sc->width || st->codec->height != sc->height) {
01804             AVRational r = av_d2q(((double)st->codec->height * sc->width) /
01805                                   ((double)st->codec->width * sc->height), INT_MAX);
01806             if (st->sample_aspect_ratio.num)
01807                 st->sample_aspect_ratio = av_mul_q(st->sample_aspect_ratio, r);
01808             else
01809                 st->sample_aspect_ratio = r;
01810         }
01811 
01812         av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
01813                   sc->time_scale*st->nb_frames, st->duration, INT_MAX);
01814     }
01815 
01816     switch (st->codec->codec_id) {
01817 #if CONFIG_H261_DECODER
01818     case CODEC_ID_H261:
01819 #endif
01820 #if CONFIG_H263_DECODER
01821     case CODEC_ID_H263:
01822 #endif
01823 #if CONFIG_H264_DECODER
01824     case CODEC_ID_H264:
01825 #endif
01826 #if CONFIG_MPEG4_DECODER
01827     case CODEC_ID_MPEG4:
01828 #endif
01829         st->codec->width = 0; /* let decoder init width/height */
01830         st->codec->height= 0;
01831         break;
01832     }
01833 
01834     /* Do not need those anymore. */
01835     av_freep(&sc->chunk_offsets);
01836     av_freep(&sc->stsc_data);
01837     av_freep(&sc->sample_sizes);
01838     av_freep(&sc->keyframes);
01839     av_freep(&sc->stts_data);
01840     av_freep(&sc->stps_data);
01841 
01842     return 0;
01843 }
01844 
01845 static int mov_read_ilst(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
01846 {
01847     int ret;
01848     c->itunes_metadata = 1;
01849     ret = mov_read_default(c, pb, atom);
01850     c->itunes_metadata = 0;
01851     return ret;
01852 }
01853 
01854 static int mov_read_meta(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
01855 {
01856     while (atom.size > 8) {
01857         uint32_t tag = get_le32(pb);
01858         atom.size -= 4;
01859         if (tag == MKTAG('h','d','l','r')) {
01860             url_fseek(pb, -8, SEEK_CUR);
01861             atom.size += 8;
01862             return mov_read_default(c, pb, atom);
01863         }
01864     }
01865     return 0;
01866 }
01867 
01868 static int mov_read_tkhd(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
01869 {
01870     int i;
01871     int width;
01872     int height;
01873     int64_t disp_transform[2];
01874     int display_matrix[3][2];
01875     AVStream *st;
01876     MOVStreamContext *sc;
01877     int version;
01878 
01879     if (c->fc->nb_streams < 1)
01880         return 0;
01881     st = c->fc->streams[c->fc->nb_streams-1];
01882     sc = st->priv_data;
01883 
01884     version = get_byte(pb);
01885     get_be24(pb); /* flags */
01886     /*
01887     MOV_TRACK_ENABLED 0x0001
01888     MOV_TRACK_IN_MOVIE 0x0002
01889     MOV_TRACK_IN_PREVIEW 0x0004
01890     MOV_TRACK_IN_POSTER 0x0008
01891     */
01892 
01893     if (version == 1) {
01894         get_be64(pb);
01895         get_be64(pb);
01896     } else {
01897         get_be32(pb); /* creation time */
01898         get_be32(pb); /* modification time */
01899     }
01900     st->id = (int)get_be32(pb); /* track id (NOT 0 !)*/
01901     get_be32(pb); /* reserved */
01902 
01903     /* highlevel (considering edits) duration in movie timebase */
01904     (version == 1) ? get_be64(pb) : get_be32(pb);
01905     get_be32(pb); /* reserved */
01906     get_be32(pb); /* reserved */
01907 
01908     get_be16(pb); /* layer */
01909     get_be16(pb); /* alternate group */
01910     get_be16(pb); /* volume */
01911     get_be16(pb); /* reserved */
01912 
01913     //read in the display matrix (outlined in ISO 14496-12, Section 6.2.2)
01914     // they're kept in fixed point format through all calculations
01915     // ignore u,v,z b/c we don't need the scale factor to calc aspect ratio
01916     for (i = 0; i < 3; i++) {
01917         display_matrix[i][0] = get_be32(pb);   // 16.16 fixed point
01918         display_matrix[i][1] = get_be32(pb);   // 16.16 fixed point
01919         get_be32(pb);           // 2.30 fixed point (not used)
01920     }
01921 
01922     width = get_be32(pb);       // 16.16 fixed point track width
01923     height = get_be32(pb);      // 16.16 fixed point track height
01924     sc->width = width >> 16;
01925     sc->height = height >> 16;
01926 
01927     // transform the display width/height according to the matrix
01928     // skip this if the display matrix is the default identity matrix
01929     // or if it is rotating the picture, ex iPhone 3GS
01930     // to keep the same scale, use [width height 1<<16]
01931     if (width && height &&
01932         ((display_matrix[0][0] != 65536  ||
01933           display_matrix[1][1] != 65536) &&
01934          !display_matrix[0][1] &&
01935          !display_matrix[1][0] &&
01936          !display_matrix[2][0] && !display_matrix[2][1])) {
01937         for (i = 0; i < 2; i++)
01938             disp_transform[i] =
01939                 (int64_t)  width  * display_matrix[0][i] +
01940                 (int64_t)  height * display_matrix[1][i] +
01941                 ((int64_t) display_matrix[2][i] << 16);
01942 
01943         //sample aspect ratio is new width/height divided by old width/height
01944         st->sample_aspect_ratio = av_d2q(
01945             ((double) disp_transform[0] * height) /
01946             ((double) disp_transform[1] * width), INT_MAX);
01947     }
01948     return 0;
01949 }
01950 
01951 static int mov_read_tfhd(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
01952 {
01953     MOVFragment *frag = &c->fragment;
01954     MOVTrackExt *trex = NULL;
01955     int flags, track_id, i;
01956 
01957     get_byte(pb); /* version */
01958     flags = get_be24(pb);
01959 
01960     track_id = get_be32(pb);
01961     if (!track_id)
01962         return -1;
01963     frag->track_id = track_id;
01964     for (i = 0; i < c->trex_count; i++)
01965         if (c->trex_data[i].track_id == frag->track_id) {
01966             trex = &c->trex_data[i];
01967             break;
01968         }
01969     if (!trex) {
01970         av_log(c->fc, AV_LOG_ERROR, "could not find corresponding trex\n");
01971         return -1;
01972     }
01973 
01974     if (flags & 0x01) frag->base_data_offset = get_be64(pb);
01975     else              frag->base_data_offset = frag->moof_offset;
01976     if (flags & 0x02) frag->stsd_id          = get_be32(pb);
01977     else              frag->stsd_id          = trex->stsd_id;
01978 
01979     frag->duration = flags & 0x08 ? get_be32(pb) : trex->duration;
01980     frag->size     = flags & 0x10 ? get_be32(pb) : trex->size;
01981     frag->flags    = flags & 0x20 ? get_be32(pb) : trex->flags;
01982     dprintf(c->fc, "frag flags 0x%x\n", frag->flags);
01983     return 0;
01984 }
01985 
01986 static int mov_read_chap(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
01987 {
01988     c->chapter_track = get_be32(pb);
01989     return 0;
01990 }
01991 
01992 static int mov_read_trex(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
01993 {
01994     MOVTrackExt *trex;
01995 
01996     if ((uint64_t)c->trex_count+1 >= UINT_MAX / sizeof(*c->trex_data))
01997         return -1;
01998     trex = av_realloc(c->trex_data, (c->trex_count+1)*sizeof(*c->trex_data));
01999     if (!trex)
02000         return AVERROR(ENOMEM);
02001     c->trex_data = trex;
02002     trex = &c->trex_data[c->trex_count++];
02003     get_byte(pb); /* version */
02004     get_be24(pb); /* flags */
02005     trex->track_id = get_be32(pb);
02006     trex->stsd_id  = get_be32(pb);
02007     trex->duration = get_be32(pb);
02008     trex->size     = get_be32(pb);
02009     trex->flags    = get_be32(pb);
02010     return 0;
02011 }
02012 
02013 static int mov_read_trun(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
02014 {
02015     MOVFragment *frag = &c->fragment;
02016     AVStream *st = NULL;
02017     MOVStreamContext *sc;
02018     uint64_t offset;
02019     int64_t dts;
02020     int data_offset = 0;
02021     unsigned entries, first_sample_flags = frag->flags;
02022     int flags, distance, i;
02023 
02024     for (i = 0; i < c->fc->nb_streams; i++) {
02025         if (c->fc->streams[i]->id == frag->track_id) {
02026             st = c->fc->streams[i];
02027             break;
02028         }
02029     }
02030     if (!st) {
02031         av_log(c->fc, AV_LOG_ERROR, "could not find corresponding track id %d\n", frag->track_id);
02032         return -1;
02033     }
02034     sc = st->priv_data;
02035     if (sc->pseudo_stream_id+1 != frag->stsd_id)
02036         return 0;
02037     get_byte(pb); /* version */
02038     flags = get_be24(pb);
02039     entries = get_be32(pb);
02040     dprintf(c->fc, "flags 0x%x entries %d\n", flags, entries);
02041     if (flags & 0x001) data_offset        = get_be32(pb);
02042     if (flags & 0x004) first_sample_flags = get_be32(pb);
02043     if (flags & 0x800) {
02044         MOVStts *ctts_data;
02045         if ((uint64_t)entries+sc->ctts_count >= UINT_MAX/sizeof(*sc->ctts_data))
02046             return -1;
02047         ctts_data = av_realloc(sc->ctts_data,
02048                                (entries+sc->ctts_count)*sizeof(*sc->ctts_data));
02049         if (!ctts_data)
02050             return AVERROR(ENOMEM);
02051         sc->ctts_data = ctts_data;
02052     }
02053     dts = st->duration;
02054     offset = frag->base_data_offset + data_offset;
02055     distance = 0;
02056     dprintf(c->fc, "first sample flags 0x%x\n", first_sample_flags);
02057     for (i = 0; i < entries; i++) {
02058         unsigned sample_size = frag->size;
02059         int sample_flags = i ? frag->flags : first_sample_flags;
02060         unsigned sample_duration = frag->duration;
02061         int keyframe;
02062 
02063         if (flags & 0x100) sample_duration = get_be32(pb);
02064         if (flags & 0x200) sample_size     = get_be32(pb);
02065         if (flags & 0x400) sample_flags    = get_be32(pb);
02066         if (flags & 0x800) {
02067             sc->ctts_data[sc->ctts_count].count = 1;
02068             sc->ctts_data[sc->ctts_count].duration = get_be32(pb);
02069             sc->ctts_count++;
02070         }
02071         if ((keyframe = st->codec->codec_type == AVMEDIA_TYPE_AUDIO ||
02072              (flags & 0x004 && !i && !sample_flags) || sample_flags & 0x2000000))
02073             distance = 0;
02074         av_add_index_entry(st, offset, dts, sample_size, distance,
02075                            keyframe ? AVINDEX_KEYFRAME : 0);
02076         dprintf(c->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "
02077                 "size %d, distance %d, keyframe %d\n", st->index, sc->sample_count+i,
02078                 offset, dts, sample_size, distance, keyframe);
02079         distance++;
02080         dts += sample_duration;
02081         offset += sample_size;
02082     }
02083     frag->moof_offset = offset;
02084     st->duration = dts;
02085     return 0;
02086 }
02087 
02088 /* this atom should be null (from specs), but some buggy files put the 'moov' atom inside it... */
02089 /* like the files created with Adobe Premiere 5.0, for samples see */
02090 /* http://graphics.tudelft.nl/~wouter/publications/soundtests/ */
02091 static int mov_read_wide(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
02092 {
02093     int err;
02094 
02095     if (atom.size < 8)
02096         return 0; /* continue */
02097     if (get_be32(pb) != 0) { /* 0 sized mdat atom... use the 'wide' atom size */
02098         url_fskip(pb, atom.size - 4);
02099         return 0;
02100     }
02101     atom.type = get_le32(pb);
02102     atom.size -= 8;
02103     if (atom.type != MKTAG('m','d','a','t')) {
02104         url_fskip(pb, atom.size);
02105         return 0;
02106     }
02107     err = mov_read_mdat(c, pb, atom);
02108     return err;
02109 }
02110 
02111 static int mov_read_cmov(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
02112 {
02113 #if CONFIG_ZLIB
02114     ByteIOContext ctx;
02115     uint8_t *cmov_data;
02116     uint8_t *moov_data; /* uncompressed data */
02117     long cmov_len, moov_len;
02118     int ret = -1;
02119 
02120     get_be32(pb); /* dcom atom */
02121     if (get_le32(pb) != MKTAG('d','c','o','m'))
02122         return -1;
02123     if (get_le32(pb) != MKTAG('z','l','i','b')) {
02124         av_log(c->fc, AV_LOG_ERROR, "unknown compression for cmov atom !");
02125         return -1;
02126     }
02127     get_be32(pb); /* cmvd atom */
02128     if (get_le32(pb) != MKTAG('c','m','v','d'))
02129         return -1;
02130     moov_len = get_be32(pb); /* uncompressed size */
02131     cmov_len = atom.size - 6 * 4;
02132 
02133     cmov_data = av_malloc(cmov_len);
02134     if (!cmov_data)
02135         return AVERROR(ENOMEM);
02136     moov_data = av_malloc(moov_len);
02137     if (!moov_data) {
02138         av_free(cmov_data);
02139         return AVERROR(ENOMEM);
02140     }
02141     get_buffer(pb, cmov_data, cmov_len);
02142     if(uncompress (moov_data, (uLongf *) &moov_len, (const Bytef *)cmov_data, cmov_len) != Z_OK)
02143         goto free_and_return;
02144     if(init_put_byte(&ctx, moov_data, moov_len, 0, NULL, NULL, NULL, NULL) != 0)
02145         goto free_and_return;
02146     atom.type = MKTAG('m','o','o','v');
02147     atom.size = moov_len;
02148 #ifdef DEBUG
02149 //    { int fd = open("/tmp/uncompheader.mov", O_WRONLY | O_CREAT); write(fd, moov_data, moov_len); close(fd); }
02150 #endif
02151     ret = mov_read_default(c, &ctx, atom);
02152 free_and_return:
02153     av_free(moov_data);
02154     av_free(cmov_data);
02155     return ret;
02156 #else
02157     av_log(c->fc, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
02158     return -1;
02159 #endif
02160 }
02161 
02162 /* edit list atom */
02163 static int mov_read_elst(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
02164 {
02165     MOVStreamContext *sc;
02166     int i, edit_count;
02167 
02168     if (c->fc->nb_streams < 1)
02169         return 0;
02170     sc = c->fc->streams[c->fc->nb_streams-1]->priv_data;
02171 
02172     get_byte(pb); /* version */
02173     get_be24(pb); /* flags */
02174     edit_count = get_be32(pb); /* entries */
02175 
02176     if((uint64_t)edit_count*12+8 > atom.size)
02177         return -1;
02178 
02179     for(i=0; i<edit_count; i++){
02180         int time;
02181         int duration = get_be32(pb); /* Track duration */
02182         time = get_be32(pb); /* Media time */
02183         get_be32(pb); /* Media rate */
02184         if (i == 0 && time >= -1) {
02185             sc->time_offset = time != -1 ? time : -duration;
02186         }
02187     }
02188 
02189     if(edit_count > 1)
02190         av_log(c->fc, AV_LOG_WARNING, "multiple edit list entries, "
02191                "a/v desync might occur, patch welcome\n");
02192 
02193     dprintf(c->fc, "track[%i].edit_count = %i\n", c->fc->nb_streams-1, edit_count);
02194     return 0;
02195 }
02196 
02197 static const MOVParseTableEntry mov_default_parse_table[] = {
02198 { MKTAG('a','v','s','s'), mov_read_extradata },
02199 { MKTAG('c','h','p','l'), mov_read_chpl },
02200 { MKTAG('c','o','6','4'), mov_read_stco },
02201 { MKTAG('c','t','t','s'), mov_read_ctts }, /* composition time to sample */
02202 { MKTAG('d','i','n','f'), mov_read_default },
02203 { MKTAG('d','r','e','f'), mov_read_dref },
02204 { MKTAG('e','d','t','s'), mov_read_default },
02205 { MKTAG('e','l','s','t'), mov_read_elst },
02206 { MKTAG('e','n','d','a'), mov_read_enda },
02207 { MKTAG('f','i','e','l'), mov_read_extradata },
02208 { MKTAG('f','t','y','p'), mov_read_ftyp },
02209 { MKTAG('g','l','b','l'), mov_read_glbl },
02210 { MKTAG('h','d','l','r'), mov_read_hdlr },
02211 { MKTAG('i','l','s','t'), mov_read_ilst },
02212 { MKTAG('j','p','2','h'), mov_read_extradata },
02213 { MKTAG('m','d','a','t'), mov_read_mdat },
02214 { MKTAG('m','d','h','d'), mov_read_mdhd },
02215 { MKTAG('m','d','i','a'), mov_read_default },
02216 { MKTAG('m','e','t','a'), mov_read_meta },
02217 { MKTAG('m','i','n','f'), mov_read_default },
02218 { MKTAG('m','o','o','f'), mov_read_moof },
02219 { MKTAG('m','o','o','v'), mov_read_moov },
02220 { MKTAG('m','v','e','x'), mov_read_default },
02221 { MKTAG('m','v','h','d'), mov_read_mvhd },
02222 { MKTAG('S','M','I',' '), mov_read_smi }, /* Sorenson extension ??? */
02223 { MKTAG('a','l','a','c'), mov_read_extradata }, /* alac specific atom */
02224 { MKTAG('a','v','c','C'), mov_read_glbl },
02225 { MKTAG('p','a','s','p'), mov_read_pasp },
02226 { MKTAG('s','t','b','l'), mov_read_default },
02227 { MKTAG('s','t','c','o'), mov_read_stco },
02228 { MKTAG('s','t','p','s'), mov_read_stps },
02229 { MKTAG('s','t','r','f'), mov_read_strf },
02230 { MKTAG('s','t','s','c'), mov_read_stsc },
02231 { MKTAG('s','t','s','d'), mov_read_stsd }, /* sample description */
02232 { MKTAG('s','t','s','s'), mov_read_stss }, /* sync sample */
02233 { MKTAG('s','t','s','z'), mov_read_stsz }, /* sample size */
02234 { MKTAG('s','t','t','s'), mov_read_stts },
02235 { MKTAG('s','t','z','2'), mov_read_stsz }, /* compact sample size */
02236 { MKTAG('t','k','h','d'), mov_read_tkhd }, /* track header */
02237 { MKTAG('t','f','h','d'), mov_read_tfhd }, /* track fragment header */
02238 { MKTAG('t','r','a','k'), mov_read_trak },
02239 { MKTAG('t','r','a','f'), mov_read_default },
02240 { MKTAG('t','r','e','f'), mov_read_default },
02241 { MKTAG('c','h','a','p'), mov_read_chap },
02242 { MKTAG('t','r','e','x'), mov_read_trex },
02243 { MKTAG('t','r','u','n'), mov_read_trun },
02244 { MKTAG('u','d','t','a'), mov_read_default },
02245 { MKTAG('w','a','v','e'), mov_read_wave },
02246 { MKTAG('e','s','d','s'), mov_read_esds },
02247 { MKTAG('w','i','d','e'), mov_read_wide }, /* place holder */
02248 { MKTAG('c','m','o','v'), mov_read_cmov },
02249 { 0, NULL }
02250 };
02251 
02252 static int mov_probe(AVProbeData *p)
02253 {
02254     unsigned int offset;
02255     uint32_t tag;
02256     int score = 0;
02257 
02258     /* check file header */
02259     offset = 0;
02260     for(;;) {
02261         /* ignore invalid offset */
02262         if ((offset + 8) > (unsigned int)p->buf_size)
02263             return score;
02264         tag = AV_RL32(p->buf + offset + 4);
02265         switch(tag) {
02266         /* check for obvious tags */
02267         case MKTAG('j','P',' ',' '): /* jpeg 2000 signature */
02268         case MKTAG('m','o','o','v'):
02269         case MKTAG('m','d','a','t'):
02270         case MKTAG('p','n','o','t'): /* detect movs with preview pics like ew.mov and april.mov */
02271         case MKTAG('u','d','t','a'): /* Packet Video PVAuthor adds this and a lot of more junk */
02272         case MKTAG('f','t','y','p'):
02273             return AVPROBE_SCORE_MAX;
02274         /* those are more common words, so rate then a bit less */
02275         case MKTAG('e','d','i','w'): /* xdcam files have reverted first tags */
02276         case MKTAG('w','i','d','e'):
02277         case MKTAG('f','r','e','e'):
02278         case MKTAG('j','u','n','k'):
02279         case MKTAG('p','i','c','t'):
02280             return AVPROBE_SCORE_MAX - 5;
02281         case MKTAG(0x82,0x82,0x7f,0x7d):
02282         case MKTAG('s','k','i','p'):
02283         case MKTAG('u','u','i','d'):
02284         case MKTAG('p','r','f','l'):
02285             offset = AV_RB32(p->buf+offset) + offset;
02286             /* if we only find those cause probedata is too small at least rate them */
02287             score = AVPROBE_SCORE_MAX - 50;
02288             break;
02289         default:
02290             /* unrecognized tag */
02291             return score;
02292         }
02293     }
02294     return score;
02295 }
02296 
02297 // must be done after parsing all trak because there's no order requirement
02298 static void mov_read_chapters(AVFormatContext *s)
02299 {
02300     MOVContext *mov = s->priv_data;
02301     AVStream *st = NULL;
02302     MOVStreamContext *sc;
02303     int64_t cur_pos;
02304     uint8_t *title = NULL;
02305     int i, len, i8, i16;
02306 
02307     for (i = 0; i < s->nb_streams; i++)
02308         if (s->streams[i]->id == mov->chapter_track) {
02309             st = s->streams[i];
02310             break;
02311         }
02312     if (!st) {
02313         av_log(s, AV_LOG_ERROR, "Referenced QT chapter track not found\n");
02314         return;
02315     }
02316 
02317     st->discard = AVDISCARD_ALL;
02318     sc = st->priv_data;
02319     cur_pos = url_ftell(sc->pb);
02320 
02321     for (i = 0; i < st->nb_index_entries; i++) {
02322         AVIndexEntry *sample = &st->index_entries[i];
02323         int64_t end = i+1 < st->nb_index_entries ? st->index_entries[i+1].timestamp : st->duration;
02324 
02325         if (url_fseek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {
02326             av_log(s, AV_LOG_ERROR, "Chapter %d not found in file\n", i);
02327             goto finish;
02328         }
02329 
02330         title = av_malloc(sample->size+2);
02331         get_buffer(sc->pb, title, sample->size);
02332 
02333         // the first two bytes are the length of the title
02334         len = AV_RB16(title);
02335         if (len > sample->size-2)
02336             continue;
02337 
02338         // The samples could theoretically be in any encoding if there's an encd
02339         // atom following, but in practice are only utf-8 or utf-16, distinguished
02340         // instead by the presence of a BOM
02341         if (AV_RB16(title+2) == 0xfeff) {
02342             uint8_t *utf8 = av_malloc(2*len+3);
02343 
02344             i8 = i16 = 0;
02345             while (i16 < len) {
02346                 uint32_t ch;
02347                 uint8_t tmp;
02348                 GET_UTF16(ch, i16 < len ? AV_RB16(title + (i16+=2)) : 0, break;)
02349                 PUT_UTF8(ch, tmp, if (i8 < 2*len) utf8[2+i8++] = tmp;)
02350             }
02351             utf8[2+i8] = 0;
02352             av_freep(&title);
02353             title = utf8;
02354         }
02355 
02356         ff_new_chapter(s, i, st->time_base, sample->timestamp, end, title+2);
02357         av_freep(&title);
02358     }
02359 finish:
02360     av_free(title);
02361     url_fseek(sc->pb, cur_pos, SEEK_SET);
02362 }
02363 
02364 static int mov_read_header(AVFormatContext *s, AVFormatParameters *ap)
02365 {
02366     MOVContext *mov = s->priv_data;
02367     ByteIOContext *pb = s->pb;
02368     int err;
02369     MOVAtom atom = { 0 };
02370 
02371     mov->fc = s;
02372     /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */
02373     if(!url_is_streamed(pb))
02374         atom.size = url_fsize(pb);
02375     else
02376         atom.size = INT64_MAX;
02377 
02378     /* check MOV header */
02379     if ((err = mov_read_default(mov, pb, atom)) < 0) {
02380         av_log(s, AV_LOG_ERROR, "error reading header: %d\n", err);
02381         return err;
02382     }
02383     if (!mov->found_moov) {
02384         av_log(s, AV_LOG_ERROR, "moov atom not found\n");
02385         return -1;
02386     }
02387     dprintf(mov->fc, "on_parse_exit_offset=%lld\n", url_ftell(pb));
02388 
02389     if (!url_is_streamed(pb) && mov->chapter_track > 0)
02390         mov_read_chapters(s);
02391 
02392     return 0;
02393 }
02394 
02395 static AVIndexEntry *mov_find_next_sample(AVFormatContext *s, AVStream **st)
02396 {
02397     AVIndexEntry *sample = NULL;
02398     int64_t best_dts = INT64_MAX;
02399     int i;
02400     for (i = 0; i < s->nb_streams; i++) {
02401         AVStream *avst = s->streams[i];
02402         MOVStreamContext *msc = avst->priv_data;
02403         if (msc->pb && msc->current_sample < avst->nb_index_entries) {
02404             AVIndexEntry *current_sample = &avst->index_entries[msc->current_sample];
02405             int64_t dts = av_rescale(current_sample->timestamp, AV_TIME_BASE, msc->time_scale);
02406             dprintf(s, "stream %d, sample %d, dts %"PRId64"\n", i, msc->current_sample, dts);
02407             if (!sample || (url_is_streamed(s->pb) && current_sample->pos < sample->pos) ||
02408                 (!url_is_streamed(s->pb) &&
02409                  ((msc->pb != s->pb && dts < best_dts) || (msc->pb == s->pb &&
02410                  ((FFABS(best_dts - dts) <= AV_TIME_BASE && current_sample->pos < sample->pos) ||
02411                   (FFABS(best_dts - dts) > AV_TIME_BASE && dts < best_dts)))))) {
02412                 sample = current_sample;
02413                 best_dts = dts;
02414                 *st = avst;
02415             }
02416         }
02417     }
02418     return sample;
02419 }
02420 
02421 static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)
02422 {
02423     MOVContext *mov = s->priv_data;
02424     MOVStreamContext *sc;
02425     AVIndexEntry *sample;
02426     AVStream *st = NULL;
02427     int ret;
02428  retry:
02429     sample = mov_find_next_sample(s, &st);
02430     if (!sample) {
02431         mov->found_mdat = 0;
02432         if (!url_is_streamed(s->pb) ||
02433             mov_read_default(mov, s->pb, (MOVAtom){ 0, INT64_MAX }) < 0 ||
02434             url_feof(s->pb))
02435             return AVERROR_EOF;
02436         dprintf(s, "read fragments, offset 0x%llx\n", url_ftell(s->pb));
02437         goto retry;
02438     }
02439     sc = st->priv_data;
02440     /* must be done just before reading, to avoid infinite loop on sample */
02441     sc->current_sample++;
02442 
02443     if (st->discard != AVDISCARD_ALL) {
02444         if (url_fseek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {
02445             av_log(mov->fc, AV_LOG_ERROR, "stream %d, offset 0x%"PRIx64": partial file\n",
02446                    sc->ffindex, sample->pos);
02447             return -1;
02448         }
02449         ret = av_get_packet(sc->pb, pkt, sample->size);
02450         if (ret < 0)
02451             return ret;
02452 #if CONFIG_DV_DEMUXER
02453         if (mov->dv_demux && sc->dv_audio_container) {
02454             dv_produce_packet(mov->dv_demux, pkt, pkt->data, pkt->size);
02455             av_free(pkt->data);
02456             pkt->size = 0;
02457             ret = dv_get_packet(mov->dv_demux, pkt);
02458             if (ret < 0)
02459                 return ret;
02460         }
02461 #endif
02462     }
02463 
02464     pkt->stream_index = sc->ffindex;
02465     pkt->dts = sample->timestamp;
02466     if (sc->ctts_data) {
02467         pkt->pts = pkt->dts + sc->dts_shift + sc->ctts_data[sc->ctts_index].duration;
02468         /* update ctts context */
02469         sc->ctts_sample++;
02470         if (sc->ctts_index < sc->ctts_count &&
02471             sc->ctts_data[sc->ctts_index].count == sc->ctts_sample) {
02472             sc->ctts_index++;
02473             sc->ctts_sample = 0;
02474         }
02475         if (sc->wrong_dts)
02476             pkt->dts = AV_NOPTS_VALUE;
02477     } else {
02478         int64_t next_dts = (sc->current_sample < st->nb_index_entries) ?
02479             st->index_entries[sc->current_sample].timestamp : st->duration;
02480         pkt->duration = next_dts - pkt->dts;
02481         pkt->pts = pkt->dts;
02482     }
02483     if (st->discard == AVDISCARD_ALL)
02484         goto retry;
02485     pkt->flags |= sample->flags & AVINDEX_KEYFRAME ? AV_PKT_FLAG_KEY : 0;
02486     pkt->pos = sample->pos;
02487     dprintf(s, "stream %d, pts %"PRId64", dts %"PRId64", pos 0x%"PRIx64", duration %d\n",
02488             pkt->stream_index, pkt->pts, pkt->dts, pkt->pos, pkt->duration);
02489     return 0;
02490 }
02491 
02492 static int mov_seek_stream(AVFormatContext *s, AVStream *st, int64_t timestamp, int flags)
02493 {
02494     MOVStreamContext *sc = st->priv_data;
02495     int sample, time_sample;
02496     int i;
02497 
02498     sample = av_index_search_timestamp(st, timestamp, flags);
02499     dprintf(s, "stream %d, timestamp %"PRId64", sample %d\n", st->index, timestamp, sample);
02500     if (sample < 0) /* not sure what to do */
02501         return -1;
02502     sc->current_sample = sample;
02503     dprintf(s, "stream %d, found sample %d\n", st->index, sc->current_sample);
02504     /* adjust ctts index */
02505     if (sc->ctts_data) {
02506         time_sample = 0;
02507         for (i = 0; i < sc->ctts_count; i++) {
02508             int next = time_sample + sc->ctts_data[i].count;
02509             if (next > sc->current_sample) {
02510                 sc->ctts_index = i;
02511                 sc->ctts_sample = sc->current_sample - time_sample;
02512                 break;
02513             }
02514             time_sample = next;
02515         }
02516     }
02517     return sample;
02518 }
02519 
02520 static int mov_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
02521 {
02522     AVStream *st;
02523     int64_t seek_timestamp, timestamp;
02524     int sample;
02525     int i;
02526 
02527     if (stream_index >= s->nb_streams)
02528         return -1;
02529     if (sample_time < 0)
02530         sample_time = 0;
02531 
02532     st = s->streams[stream_index];
02533     sample = mov_seek_stream(s, st, sample_time, flags);
02534     if (sample < 0)
02535         return -1;
02536 
02537     /* adjust seek timestamp to found sample timestamp */
02538     seek_timestamp = st->index_entries[sample].timestamp;
02539 
02540     for (i = 0; i < s->nb_streams; i++) {
02541         st = s->streams[i];
02542         if (stream_index == i)
02543             continue;
02544 
02545         timestamp = av_rescale_q(seek_timestamp, s->streams[stream_index]->time_base, st->time_base);
02546         mov_seek_stream(s, st, timestamp, flags);
02547     }
02548     return 0;
02549 }
02550 
02551 static int mov_read_close(AVFormatContext *s)
02552 {
02553     MOVContext *mov = s->priv_data;
02554     int i, j;
02555 
02556     for (i = 0; i < s->nb_streams; i++) {
02557         AVStream *st = s->streams[i];
02558         MOVStreamContext *sc = st->priv_data;
02559 
02560         av_freep(&sc->ctts_data);
02561         for (j = 0; j < sc->drefs_count; j++) {
02562             av_freep(&sc->drefs[j].path);
02563             av_freep(&sc->drefs[j].dir);
02564         }
02565         av_freep(&sc->drefs);
02566         if (sc->pb && sc->pb != s->pb)
02567             url_fclose(sc->pb);
02568 
02569         av_freep(&st->codec->palctrl);
02570     }
02571 
02572     if (mov->dv_demux) {
02573         for(i = 0; i < mov->dv_fctx->nb_streams; i++) {
02574             av_freep(&mov->dv_fctx->streams[i]->codec);
02575             av_freep(&mov->dv_fctx->streams[i]);
02576         }
02577         av_freep(&mov->dv_fctx);
02578         av_freep(&mov->dv_demux);
02579     }
02580 
02581     av_freep(&mov->trex_data);
02582 
02583     return 0;
02584 }
02585 
02586 AVInputFormat mov_demuxer = {
02587     "mov,mp4,m4a,3gp,3g2,mj2",
02588     NULL_IF_CONFIG_SMALL("QuickTime/MPEG-4/Motion JPEG 2000 format"),
02589     sizeof(MOVContext),
02590     mov_probe,
02591     mov_read_header,
02592     mov_read_packet,
02593     mov_read_close,
02594     mov_read_seek,
02595 };

Generated on Fri Sep 16 2011 17:17:49 for FFmpeg by  doxygen 1.7.1