MythTV: mov.c Source File

00001 /*
00002  * MOV demuxer
00003  * Copyright (c) 2001 Fabrice Bellard.
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include <limits.h>
00023 
00024 //#define DEBUG
00025 
00026 #include "avformat.h"
00027 #include "riff.h"
00028 #include "isom.h"
00029 #include "dv.h"
00030 
00031 #ifdef CONFIG_ZLIB
00032 #include <zlib.h>
00033 #endif
00034 
00035 /*
00036  * First version by Francois Revol revol@free.fr
00037  * Seek function by Gael Chardon gael.dev@4now.net
00038  *
00039  * Features and limitations:
00040  * - reads most of the QT files I have (at least the structure),
00041  *   Sample QuickTime files with mp3 audio can be found at: http://www.3ivx.com/showcase.html
00042  * - the code is quite ugly... maybe I won't do it recursive next time :-)
00043  *
00044  * Funny I didn't know about http://sourceforge.net/projects/qt-ffmpeg/
00045  * when coding this :) (it's a writer anyway)
00046  *
00047  * Reference documents:
00048  * http://www.geocities.com/xhelmboyx/quicktime/formats/qtm-layout.txt
00049  * Apple:
00050  *  http://developer.apple.com/documentation/QuickTime/QTFF/
00051  *  http://developer.apple.com/documentation/QuickTime/QTFF/qtff.pdf
00052  * QuickTime is a trademark of Apple (AFAIK :))
00053  */
00054 
00055 #include "qtpalette.h"
00056 
00057 
00058 #undef NDEBUG
00059 #include <assert.h>
00060 
00061 /* the QuickTime file format is quite convoluted...
00062  * it has lots of index tables, each indexing something in another one...
00063  * Here we just use what is needed to read the chunks
00064  */
00065 
00066 typedef struct {
00067     int first;
00068     int count;
00069     int id;
00070 } MOV_stsc_t;
00071 
00072 typedef struct {
00073     uint32_t type;
00074     int64_t offset;
00075     int64_t size; /* total size (excluding the size and type fields) */
00076 } MOV_atom_t;
00077 
00078 typedef struct {
00079     offset_t offset;
00080     int64_t size;
00081 } MOV_mdat_t;
00082 
00083 struct MOVParseTableEntry;
00084 
00085 typedef struct MOVStreamContext {
00086     int ffindex; /* the ffmpeg stream id */
00087     int next_chunk;
00088     unsigned int chunk_count;
00089     int64_t *chunk_offsets;
00090     unsigned int stts_count;
00091     MOV_stts_t *stts_data;
00092     unsigned int ctts_count;
00093     MOV_stts_t *ctts_data;
00094     unsigned int edit_count; /* number of 'edit' (elst atom) */
00095     unsigned int sample_to_chunk_sz;
00096     MOV_stsc_t *sample_to_chunk;
00097     int sample_to_ctime_index;
00098     int sample_to_ctime_sample;
00099     unsigned int sample_size;
00100     unsigned int sample_count;
00101     int *sample_sizes;
00102     unsigned int keyframe_count;
00103     int *keyframes;
00104     int time_scale;
00105     int time_rate;
00106     int current_sample;
00107     unsigned int bytes_per_frame;
00108     unsigned int samples_per_frame;
00109     int dv_audio_container;
00110 } MOVStreamContext;
00111 
00112 typedef struct MOVContext {
00113     AVFormatContext *fc;
00114     int time_scale;
00115     int64_t duration; /* duration of the longest track */
00116     int found_moov; /* when both 'moov' and 'mdat' sections has been found */
00117     int found_mdat; /* we suppose we have enough data to read the file */
00118     int64_t mdat_offset;
00119     int total_streams;
00120     MOVStreamContext *streams[MAX_STREAMS];
00121 
00122     const struct MOVParseTableEntry *parse_table; /* could be eventually used to change the table */
00123     /* NOTE: for recursion save to/ restore from local variable! */
00124 
00125     AVPaletteControl palette_control;
00126     MOV_mdat_t *mdat_list;
00127     int mdat_count;
00128     DVDemuxContext *dv_demux;
00129     AVFormatContext *dv_fctx;
00130     int isom; /* 1 if file is ISO Media (mp4/3gp) */
00131 } MOVContext;
00132 
00133 
00134 /* XXX: it's the first time I make a recursive parser I think... sorry if it's ugly :P */
00135 
00136 /* those functions parse an atom */
00137 /* return code:
00138  1: found what I wanted, exit
00139  0: continue to parse next atom
00140  -1: error occured, exit
00141  */
00142 typedef int (*mov_parse_function)(MOVContext *ctx, ByteIOContext *pb, MOV_atom_t atom);
00143 
00144 /* links atom IDs to parse functions */
00145 typedef struct MOVParseTableEntry {
00146     uint32_t type;
00147     mov_parse_function func;
00148 } MOVParseTableEntry;
00149 
00150 static int mov_read_default(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
00151 {
00152     int64_t total_size = 0;
00153     MOV_atom_t a;
00154     int i;
00155     int err = 0;
00156 
00157     a.offset = atom.offset;
00158 
00159     if (atom.size < 0)
00160         atom.size = INT64_MAX;
00161     while(((total_size + 8) < atom.size) && !url_feof(pb) && !err) {
00162         a.size = atom.size;
00163         a.type=0L;
00164         if(atom.size >= 8) {
00165             a.size = get_be32(pb);
00166             a.type = get_le32(pb);
00167         }
00168         total_size += 8;
00169         a.offset += 8;
00170         dprintf(c->fc, "type: %08x  %.4s  sz: %"PRIx64"  %"PRIx64"   %"PRIx64"\n", a.type, (char*)&a.type, a.size, atom.size, total_size);
00171         if (a.size == 1) { /* 64 bit extended size */
00172             a.size = get_be64(pb) - 8;
00173             a.offset += 8;
00174             total_size += 8;
00175         }
00176         if (a.size == 0) {
00177             a.size = atom.size - total_size;
00178             if (a.size <= 8)
00179                 break;
00180         }
00181         a.size -= 8;
00182         if(a.size < 0)
00183             break;
00184         a.size = FFMIN(a.size, atom.size - total_size);
00185 
00186         for (i = 0; c->parse_table[i].type != 0L
00187              && c->parse_table[i].type != a.type; i++)
00188             /* empty */;
00189 
00190         if (c->parse_table[i].type == 0) { /* skip leaf atoms data */
00191             url_fskip(pb, a.size);
00192         } else {
00193             offset_t start_pos = url_ftell(pb);
00194             int64_t left;
00195             err = (c->parse_table[i].func)(c, pb, a);
00196             left = a.size - url_ftell(pb) + start_pos;
00197             if (left > 0) /* skip garbage at atom end */
00198                 url_fskip(pb, left);
00199         }
00200 
00201         a.offset += a.size;
00202         total_size += a.size;
00203     }
00204 
00205     if (!err && total_size < atom.size && atom.size < 0x7ffff) {
00206         url_fskip(pb, atom.size - total_size);
00207     }
00208 
00209     return err;
00210 }
00211 
00212 static int mov_read_hdlr(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
00213 {
00214     AVStream *st = c->fc->streams[c->fc->nb_streams-1];
00215     uint32_t type;
00216     uint32_t ctype;
00217 
00218     get_byte(pb); /* version */
00219     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */
00220 
00221     /* component type */
00222     ctype = get_le32(pb);
00223     type = get_le32(pb); /* component subtype */
00224 
00225     dprintf(c->fc, "ctype= %c%c%c%c (0x%08x)\n", *((char *)&ctype), ((char *)&ctype)[1], ((char *)&ctype)[2], ((char *)&ctype)[3], (int) ctype);
00226     dprintf(c->fc, "stype= %c%c%c%c\n", *((char *)&type), ((char *)&type)[1], ((char *)&type)[2], ((char *)&type)[3]);
00227     if(!ctype)
00228         c->isom = 1;
00229     if(type == MKTAG('v', 'i', 'd', 'e'))
00230         st->codec->codec_type = CODEC_TYPE_VIDEO;
00231     else if(type == MKTAG('s', 'o', 'u', 'n'))
00232         st->codec->codec_type = CODEC_TYPE_AUDIO;
00233     else if(type == MKTAG('m', '1', 'a', ' '))
00234         st->codec->codec_id = CODEC_ID_MP2;
00235     else if(type == MKTAG('s', 'u', 'b', 'p')) {
00236         st->codec->codec_type = CODEC_TYPE_SUBTITLE;
00237         st->codec->codec_id = CODEC_ID_DVD_SUBTITLE;
00238     }
00239     get_be32(pb); /* component  manufacture */
00240     get_be32(pb); /* component flags */
00241     get_be32(pb); /* component flags mask */
00242 
00243     if(atom.size <= 24)
00244         return 0; /* nothing left to read */
00245 
00246     url_fskip(pb, atom.size - (url_ftell(pb) - atom.offset));
00247     return 0;
00248 }
00249 
00250 static int mp4_read_descr_len(ByteIOContext *pb)
00251 {
00252     int len = 0;
00253     int count = 4;
00254     while (count--) {
00255         int c = get_byte(pb);
00256         len = (len << 7) | (c & 0x7f);
00257         if (!(c & 0x80))
00258             break;
00259     }
00260     return len;
00261 }
00262 
00263 static int mp4_read_descr(MOVContext *c, ByteIOContext *pb, int *tag)
00264 {
00265     int len;
00266     *tag = get_byte(pb);
00267     len = mp4_read_descr_len(pb);
00268     dprintf(c->fc, "MPEG4 description: tag=0x%02x len=%d\n", *tag, len);
00269     return len;
00270 }
00271 
00272 #define MP4ESDescrTag                   0x03
00273 #define MP4DecConfigDescrTag            0x04
00274 #define MP4DecSpecificDescrTag          0x05
00275 
00276 static int mov_read_esds(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
00277 {
00278     AVStream *st = c->fc->streams[c->fc->nb_streams-1];
00279     int tag, len;
00280 
00281     get_be32(pb); /* version + flags */
00282     len = mp4_read_descr(c, pb, &tag);
00283     if (tag == MP4ESDescrTag) {
00284         get_be16(pb); /* ID */
00285         get_byte(pb); /* priority */
00286     } else
00287         get_be16(pb); /* ID */
00288 
00289     len = mp4_read_descr(c, pb, &tag);
00290     if (tag == MP4DecConfigDescrTag) {
00291         int object_type_id = get_byte(pb);
00292         get_byte(pb); /* stream type */
00293         get_be24(pb); /* buffer size db */
00294         get_be32(pb); /* max bitrate */
00295         get_be32(pb); /* avg bitrate */
00296 
00297         st->codec->codec_id= codec_get_id(ff_mp4_obj_type, object_type_id);
00298         dprintf(c->fc, "esds object type id %d\n", object_type_id);
00299         len = mp4_read_descr(c, pb, &tag);
00300         if (tag == MP4DecSpecificDescrTag) {
00301             dprintf(c->fc, "Specific MPEG4 header len=%d\n", len);
00302             st->codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
00303             if (st->codec->extradata) {
00304                 get_buffer(pb, st->codec->extradata, len);
00305                 st->codec->extradata_size = len;
00306                 /* from mplayer */
00307                 if ((*st->codec->extradata >> 3) == 29) {
00308                     st->codec->codec_id = CODEC_ID_MP3ON4;
00309                 }
00310             }
00311         }
00312     }
00313     return 0;
00314 }
00315 
00316 /* this atom contains actual media data */
00317 static int mov_read_mdat(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
00318 {
00319     if(atom.size == 0) /* wrong one (MP4) */
00320         return 0;
00321     c->mdat_list = av_realloc(c->mdat_list, (c->mdat_count + 1) * sizeof(*c->mdat_list));
00322     c->mdat_list[c->mdat_count].offset = atom.offset;
00323     c->mdat_list[c->mdat_count].size = atom.size;
00324     c->mdat_count++;
00325     c->found_mdat=1;
00326     c->mdat_offset = atom.offset;
00327     if(c->found_moov)
00328         return 1; /* found both, just go */
00329     url_fskip(pb, atom.size);
00330     return 0; /* now go for moov */
00331 }
00332 
00333 static int mov_read_ftyp(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
00334 {
00335     uint32_t type = get_le32(pb);
00336 
00337     if (type != MKTAG('q','t',' ',' '))
00338         c->isom = 1;
00339     av_log(c->fc, AV_LOG_DEBUG, "ISO: File Type Major Brand: %.4s\n",(char *)&type);
00340     get_be32(pb); /* minor version */
00341     url_fskip(pb, atom.size - 8);
00342     return 0;
00343 }
00344 
00345 /* this atom should contain all header atoms */
00346 static int mov_read_moov(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
00347 {
00348     int err;
00349 
00350     err = mov_read_default(c, pb, atom);
00351     /* we parsed the 'moov' atom, we can terminate the parsing as soon as we find the 'mdat' */
00352     /* so we don't parse the whole file if over a network */
00353     c->found_moov=1;
00354     if(c->found_mdat)
00355         return 1; /* found both, just go */
00356     return 0; /* now go for mdat */
00357 }
00358 
00359 
00360 static int mov_read_mdhd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
00361 {
00362     AVStream *st = c->fc->streams[c->fc->nb_streams-1];
00363     MOVStreamContext *sc = st->priv_data;
00364     int version = get_byte(pb);
00365     int lang;
00366 
00367     if (version > 1)
00368         return 1; /* unsupported */
00369 
00370     get_byte(pb); get_byte(pb);
00371     get_byte(pb); /* flags */
00372 
00373     if (version == 1) {
00374         get_be64(pb);
00375         get_be64(pb);
00376     } else {
00377         get_be32(pb); /* creation time */
00378         get_be32(pb); /* modification time */
00379     }
00380 
00381     sc->time_scale = get_be32(pb);
00382     st->duration = (version == 1) ? get_be64(pb) : get_be32(pb); /* duration */
00383 
00384     lang = get_be16(pb); /* language */
00385     ff_mov_lang_to_iso639(lang, st->language);
00386     get_be16(pb); /* quality */
00387 
00388     return 0;
00389 }
00390 
00391 static int mov_read_mvhd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
00392 {
00393     int version = get_byte(pb); /* version */
00394     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */
00395 
00396     if (version == 1) {
00397         get_be64(pb);
00398         get_be64(pb);
00399     } else {
00400         get_be32(pb); /* creation time */
00401         get_be32(pb); /* modification time */
00402     }
00403     c->time_scale = get_be32(pb); /* time scale */
00404 
00405     dprintf(c->fc, "time scale = %i\n", c->time_scale);
00406 
00407     c->duration = (version == 1) ? get_be64(pb) : get_be32(pb); /* duration */
00408     get_be32(pb); /* preferred scale */
00409 
00410     get_be16(pb); /* preferred volume */
00411 
00412     url_fskip(pb, 10); /* reserved */
00413 
00414     url_fskip(pb, 36); /* display matrix */
00415 
00416     get_be32(pb); /* preview time */
00417     get_be32(pb); /* preview duration */
00418     get_be32(pb); /* poster time */
00419     get_be32(pb); /* selection time */
00420     get_be32(pb); /* selection duration */
00421     get_be32(pb); /* current time */
00422     get_be32(pb); /* next track ID */
00423 
00424     return 0;
00425 }
00426 
00427 static int mov_read_smi(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
00428 {
00429     AVStream *st = c->fc->streams[c->fc->nb_streams-1];
00430 
00431     if((uint64_t)atom.size > (1<<30))
00432         return -1;
00433 
00434     // currently SVQ3 decoder expect full STSD header - so let's fake it
00435     // this should be fixed and just SMI header should be passed
00436     av_free(st->codec->extradata);
00437     st->codec->extradata_size = 0x5a + atom.size;
00438     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00439 
00440     if (st->codec->extradata) {
00441         memcpy(st->codec->extradata, "SVQ3", 4); // fake
00442         get_buffer(pb, st->codec->extradata + 0x5a, atom.size);
00443         dprintf(c->fc, "Reading SMI %"PRId64"  %s\n", atom.size, st->codec->extradata + 0x5a);
00444     } else
00445         url_fskip(pb, atom.size);
00446 
00447     return 0;
00448 }
00449 
00450 static int mov_read_enda(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
00451 {
00452     AVStream *st = c->fc->streams[c->fc->nb_streams-1];
00453     int little_endian = get_be16(pb);
00454 
00455     if (little_endian) {
00456         switch (st->codec->codec_id) {
00457         case CODEC_ID_PCM_S24BE:
00458             st->codec->codec_id = CODEC_ID_PCM_S24LE;
00459             break;
00460         case CODEC_ID_PCM_S32BE:
00461             st->codec->codec_id = CODEC_ID_PCM_S32LE;
00462             break;
00463         default:
00464             break;
00465         }
00466     }
00467     return 0;
00468 }
00469 
00470 /* FIXME modify qdm2/svq3/h264 decoders to take full atom as extradata */
00471 static int mov_read_extradata(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
00472 {
00473     AVStream *st = c->fc->streams[c->fc->nb_streams-1];
00474     uint64_t size= (uint64_t)st->codec->extradata_size + atom.size + 8 + FF_INPUT_BUFFER_PADDING_SIZE;
00475     uint8_t *buf;
00476     if(size > INT_MAX || (uint64_t)atom.size > INT_MAX)
00477         return -1;
00478     buf= av_realloc(st->codec->extradata, size);
00479     if(!buf)
00480         return -1;
00481     st->codec->extradata= buf;
00482     buf+= st->codec->extradata_size;
00483     st->codec->extradata_size= size - FF_INPUT_BUFFER_PADDING_SIZE;
00484     AV_WB32(       buf    , atom.size + 8);
00485     AV_WL32(       buf + 4, atom.type);
00486     get_buffer(pb, buf + 8, atom.size);
00487     return 0;
00488 }
00489 
00490 static int mov_read_wave(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
00491 {
00492     AVStream *st = c->fc->streams[c->fc->nb_streams-1];
00493 
00494     if((uint64_t)atom.size > (1<<30))
00495         return -1;
00496 
00497     if (st->codec->codec_id == CODEC_ID_QDM2) {
00498         // pass all frma atom to codec, needed at least for QDM2
00499         av_free(st->codec->extradata);
00500         st->codec->extradata_size = atom.size;
00501         st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00502 
00503         if (st->codec->extradata) {
00504             get_buffer(pb, st->codec->extradata, atom.size);
00505         } else
00506             url_fskip(pb, atom.size);
00507     } else if (atom.size > 8) { /* to read frma, esds atoms */
00508         mov_read_default(c, pb, atom);
00509     } else
00510         url_fskip(pb, atom.size);
00511     return 0;
00512 }
00513 
00514 static int mov_read_avcC(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
00515 {
00516     AVStream *st = c->fc->streams[c->fc->nb_streams-1];
00517 
00518     if((uint64_t)atom.size > (1<<30))
00519         return -1;
00520 
00521     av_free(st->codec->extradata);
00522 
00523     st->codec->extradata_size = atom.size;
00524     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00525 
00526     if (st->codec->extradata) {
00527         get_buffer(pb, st->codec->extradata, atom.size);
00528     } else
00529         url_fskip(pb, atom.size);
00530 
00531     return 0;
00532 }
00533 
00534 static int mov_read_stco(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
00535 {
00536     AVStream *st = c->fc->streams[c->fc->nb_streams-1];
00537     MOVStreamContext *sc = st->priv_data;
00538     unsigned int i, entries;
00539 
00540     get_byte(pb); /* version */
00541     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */
00542 
00543     entries = get_be32(pb);
00544 
00545     if(entries >= UINT_MAX/sizeof(int64_t))
00546         return -1;
00547 
00548     sc->chunk_count = entries;
00549     sc->chunk_offsets = av_malloc(entries * sizeof(int64_t));
00550     if (!sc->chunk_offsets)
00551         return -1;
00552     if (atom.type == MKTAG('s', 't', 'c', 'o')) {
00553         for(i=0; i<entries; i++) {
00554             sc->chunk_offsets[i] = get_be32(pb);
00555         }
00556     } else if (atom.type == MKTAG('c', 'o', '6', '4')) {
00557         for(i=0; i<entries; i++) {
00558             sc->chunk_offsets[i] = get_be64(pb);
00559         }
00560     } else
00561         return -1;
00562 
00563     return 0;
00564 }
00565 
00566 static int mov_read_stsd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
00567 {
00568     AVStream *st = c->fc->streams[c->fc->nb_streams-1];
00569     MOVStreamContext *sc = st->priv_data;
00570     int entries, frames_per_sample;
00571     uint32_t format;
00572     uint8_t codec_name[32];
00573 
00574     /* for palette traversal */
00575     int color_depth;
00576     int color_start;
00577     int color_count;
00578     int color_end;
00579     int color_index;
00580     int color_dec;
00581     int color_greyscale;
00582     unsigned char *color_table;
00583     int j;
00584     unsigned char r, g, b;
00585 
00586     get_byte(pb); /* version */
00587     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */
00588 
00589     entries = get_be32(pb);
00590 
00591     while(entries--) { //Parsing Sample description table
00592         enum CodecID id;
00593         MOV_atom_t a = { 0, 0, 0 };
00594         offset_t start_pos = url_ftell(pb);
00595         int size = get_be32(pb); /* size */
00596         format = get_le32(pb); /* data format */
00597 
00598         get_be32(pb); /* reserved */
00599         get_be16(pb); /* reserved */
00600         get_be16(pb); /* index */
00601 
00602         if (st->codec->codec_tag) {
00603             /* multiple fourcc, just skip for now */
00604             url_fskip(pb, size - (url_ftell(pb) - start_pos));
00605             continue;
00606         }
00607 
00608         st->codec->codec_tag = format;
00609         id = codec_get_id(codec_movaudio_tags, format);
00610         if (id<=0 && (format&0xFFFF) == 'm' + ('s'<<8))
00611             id = codec_get_id(codec_wav_tags, bswap_32(format)&0xFFFF);
00612 
00613         if (st->codec->codec_type != CODEC_TYPE_VIDEO && id > 0) {
00614             st->codec->codec_type = CODEC_TYPE_AUDIO;
00615         } else if (st->codec->codec_type != CODEC_TYPE_AUDIO && /* do not overwrite codec type */
00616                    format && format != MKTAG('m', 'p', '4', 's')) { /* skip old asf mpeg4 tag */
00617             id = codec_get_id(codec_movvideo_tags, format);
00618             if (id <= 0)
00619                 id = codec_get_id(codec_bmp_tags, format);
00620             if (id > 0)
00621                 st->codec->codec_type = CODEC_TYPE_VIDEO;
00622         }
00623 
00624         dprintf(c->fc, "size=%d 4CC= %c%c%c%c codec_type=%d\n",
00625                 size,
00626                 (format >> 0) & 0xff, (format >> 8) & 0xff, (format >> 16) & 0xff, (format >> 24) & 0xff,
00627                 st->codec->codec_type);
00628 
00629         if(st->codec->codec_type==CODEC_TYPE_VIDEO) {
00630             st->codec->codec_id = id;
00631             get_be16(pb); /* version */
00632             get_be16(pb); /* revision level */
00633             get_be32(pb); /* vendor */
00634             get_be32(pb); /* temporal quality */
00635             get_be32(pb); /* spatial quality */
00636 
00637             st->codec->width = get_be16(pb); /* width */
00638             st->codec->height = get_be16(pb); /* height */
00639 
00640             get_be32(pb); /* horiz resolution */
00641             get_be32(pb); /* vert resolution */
00642             get_be32(pb); /* data size, always 0 */
00643             frames_per_sample = get_be16(pb); /* frames per samples */
00644 
00645             dprintf(c->fc, "frames/samples = %d\n", frames_per_sample);
00646 
00647             get_buffer(pb, codec_name, 32); /* codec name, pascal string (FIXME: true for mp4?) */
00648             if (codec_name[0] <= 31) {
00649                 memcpy(st->codec->codec_name, &codec_name[1],codec_name[0]);
00650                 st->codec->codec_name[codec_name[0]] = 0;
00651             }
00652 
00653             st->codec->bits_per_sample = get_be16(pb); /* depth */
00654             st->codec->color_table_id = get_be16(pb); /* colortable id */
00655 
00656             /* figure out the palette situation */
00657             color_depth = st->codec->bits_per_sample & 0x1F;
00658             color_greyscale = st->codec->bits_per_sample & 0x20;
00659 
00660             /* if the depth is 2, 4, or 8 bpp, file is palettized */
00661             if ((color_depth == 2) || (color_depth == 4) ||
00662                 (color_depth == 8)) {
00663 
00664                 if (color_greyscale) {
00665 
00666                     /* compute the greyscale palette */
00667                     color_count = 1 << color_depth;
00668                     color_index = 255;
00669                     color_dec = 256 / (color_count - 1);
00670                     for (j = 0; j < color_count; j++) {
00671                         r = g = b = color_index;
00672                         c->palette_control.palette[j] =
00673                             (r << 16) | (g << 8) | (b);
00674                         color_index -= color_dec;
00675                         if (color_index < 0)
00676                             color_index = 0;
00677                     }
00678 
00679                 } else if (st->codec->color_table_id & 0x08) {
00680 
00681                     /* if flag bit 3 is set, use the default palette */
00682                     color_count = 1 << color_depth;
00683                     if (color_depth == 2)
00684                         color_table = ff_qt_default_palette_4;
00685                     else if (color_depth == 4)
00686                         color_table = ff_qt_default_palette_16;
00687                     else
00688                         color_table = ff_qt_default_palette_256;
00689 
00690                     for (j = 0; j < color_count; j++) {
00691                         r = color_table[j * 4 + 0];
00692                         g = color_table[j * 4 + 1];
00693                         b = color_table[j * 4 + 2];
00694                         c->palette_control.palette[j] =
00695                             (r << 16) | (g << 8) | (b);
00696                     }
00697 
00698                 } else {
00699 
00700                     /* load the palette from the file */
00701                     color_start = get_be32(pb);
00702                     color_count = get_be16(pb);
00703                     color_end = get_be16(pb);
00704                     for (j = color_start; j <= color_end; j++) {
00705                         /* each R, G, or B component is 16 bits;
00706                          * only use the top 8 bits; skip alpha bytes
00707                          * up front */
00708                         get_byte(pb);
00709                         get_byte(pb);
00710                         r = get_byte(pb);
00711                         get_byte(pb);
00712                         g = get_byte(pb);
00713                         get_byte(pb);
00714                         b = get_byte(pb);
00715                         get_byte(pb);
00716                         c->palette_control.palette[j] =
00717                             (r << 16) | (g << 8) | (b);
00718                     }
00719                 }
00720 
00721                 st->codec->palctrl = &c->palette_control;
00722                 st->codec->palctrl->palette_changed = 1;
00723             } else
00724                 st->codec->palctrl = NULL;
00725         } else if(st->codec->codec_type==CODEC_TYPE_AUDIO) {
00726             int bits_per_sample;
00727             uint16_t version = get_be16(pb);
00728 
00729             st->codec->codec_id = id;
00730             get_be16(pb); /* revision level */
00731             get_be32(pb); /* vendor */
00732 
00733             st->codec->channels = get_be16(pb);             /* channel count */
00734             dprintf(c->fc, "audio channels %d\n", st->codec->channels);
00735             st->codec->bits_per_sample = get_be16(pb);      /* sample size */
00736             /* do we need to force to 16 for AMR ? */
00737 
00738             /* handle specific s8 codec */
00739             get_be16(pb); /* compression id = 0*/
00740             get_be16(pb); /* packet size = 0 */
00741 
00742             st->codec->sample_rate = ((get_be32(pb) >> 16));
00743 
00744             switch (st->codec->codec_id) {
00745             case CODEC_ID_PCM_S8:
00746             case CODEC_ID_PCM_U8:
00747                 if (st->codec->bits_per_sample == 16)
00748                     st->codec->codec_id = CODEC_ID_PCM_S16BE;
00749                 break;
00750             case CODEC_ID_PCM_S16LE:
00751             case CODEC_ID_PCM_S16BE:
00752                 if (st->codec->bits_per_sample == 8)
00753                     st->codec->codec_id = CODEC_ID_PCM_S8;
00754                 else if (st->codec->bits_per_sample == 24)
00755                     st->codec->codec_id = CODEC_ID_PCM_S24BE;
00756                 break;
00757             default:
00758                 break;
00759             }
00760 
00761             //Read QT version 1 fields. In version 0 these do not exist.
00762             dprintf(c->fc, "version =%d, isom =%d\n",version,c->isom);
00763             if(!c->isom) {
00764                 if(version==1) {
00765                     sc->samples_per_frame = get_be32(pb);
00766                     get_be32(pb); /* bytes per packet */
00767                     sc->bytes_per_frame = get_be32(pb);
00768                     get_be32(pb); /* bytes per sample */
00769                 } else if(version==2) {
00770                     get_be32(pb); /* sizeof struct only */
00771                     st->codec->sample_rate = av_int2dbl(get_be64(pb)); /* float 64 */
00772                     st->codec->channels = get_be32(pb);
00773                     get_be32(pb); /* always 0x7F000000 */
00774                     get_be32(pb); /* bits per channel if sound is uncompressed */
00775                     get_be32(pb); /* lcpm format specific flag */
00776                     get_be32(pb); /* bytes per audio packet if constant */
00777                     get_be32(pb); /* lpcm frames per audio packet if constant */
00778                 }
00779             }
00780 
00781             bits_per_sample = av_get_bits_per_sample(st->codec->codec_id);
00782             if (bits_per_sample) {
00783                 st->codec->bits_per_sample = bits_per_sample;
00784                 sc->sample_size = (bits_per_sample >> 3) * st->codec->channels;
00785             }
00786         } else {
00787             /* other codec type, just skip (rtp, mp4s, tmcd ...) */
00788             url_fskip(pb, size - (url_ftell(pb) - start_pos));
00789         }
00790         /* this will read extra atoms at the end (wave, alac, damr, avcC, SMI ...) */
00791         a.size = size - (url_ftell(pb) - start_pos);
00792         if (a.size > 8)
00793             mov_read_default(c, pb, a);
00794         else if (a.size > 0)
00795             url_fskip(pb, a.size);
00796     }
00797 
00798     if(st->codec->codec_type==CODEC_TYPE_AUDIO && st->codec->sample_rate==0 && sc->time_scale>1) {
00799         st->codec->sample_rate= sc->time_scale;
00800     }
00801 
00802     /* special codec parameters handling */
00803     switch (st->codec->codec_id) {
00804 #ifdef CONFIG_H261_DECODER
00805     case CODEC_ID_H261:
00806 #endif
00807 #ifdef CONFIG_H263_DECODER
00808     case CODEC_ID_H263:
00809 #endif
00810 #ifdef CONFIG_MPEG4_DECODER
00811     case CODEC_ID_MPEG4:
00812 #endif
00813         st->codec->width= 0; /* let decoder init width/height */
00814         st->codec->height= 0;
00815         break;
00816 #ifdef CONFIG_LIBFAAD
00817     case CODEC_ID_AAC:
00818 #endif
00819 #ifdef CONFIG_VORBIS_DECODER
00820     case CODEC_ID_VORBIS:
00821 #endif
00822     case CODEC_ID_MP3ON4:
00823         st->codec->sample_rate= 0; /* let decoder init parameters properly */
00824         break;
00825 #ifdef CONFIG_DV_DEMUXER
00826     case CODEC_ID_DVAUDIO:
00827         c->dv_fctx = av_alloc_format_context();
00828         c->dv_demux = dv_init_demux(c->dv_fctx);
00829         if (!c->dv_demux) {
00830             av_log(c->fc, AV_LOG_ERROR, "dv demux context init error\n");
00831             return -1;
00832         }
00833         sc->dv_audio_container = 1;
00834         st->codec->codec_id = CODEC_ID_PCM_S16LE;
00835         break;
00836 #endif
00837     /* no ifdef since parameters are always those */
00838     case CODEC_ID_AMR_WB:
00839         st->codec->sample_rate= 16000;
00840         st->codec->channels= 1; /* really needed */
00841         break;
00842     case CODEC_ID_AMR_NB:
00843         st->codec->sample_rate= 8000;
00844         st->codec->channels= 1; /* really needed */
00845         break;
00846     case CODEC_ID_MP2:
00847     case CODEC_ID_MP3:
00848         st->codec->codec_type = CODEC_TYPE_AUDIO; /* force type after stsd for m1a hdlr */
00849         st->need_parsing = AVSTREAM_PARSE_FULL;
00850         break;
00851     case CODEC_ID_ADPCM_MS:
00852     case CODEC_ID_ADPCM_IMA_WAV:
00853         st->codec->block_align = sc->bytes_per_frame;
00854         break;
00855     default:
00856         break;
00857     }
00858 
00859     return 0;
00860 }
00861 
00862 static int mov_read_stsc(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
00863 {
00864     AVStream *st = c->fc->streams[c->fc->nb_streams-1];
00865     MOVStreamContext *sc = st->priv_data;
00866     unsigned int i, entries;
00867 
00868     get_byte(pb); /* version */
00869     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */
00870 
00871     entries = get_be32(pb);
00872 
00873     if(entries >= UINT_MAX / sizeof(MOV_stsc_t))
00874         return -1;
00875 
00876     dprintf(c->fc, "track[%i].stsc.entries = %i\n", c->fc->nb_streams-1, entries);
00877 
00878     sc->sample_to_chunk_sz = entries;
00879     sc->sample_to_chunk = av_malloc(entries * sizeof(MOV_stsc_t));
00880     if (!sc->sample_to_chunk)
00881         return -1;
00882     for(i=0; i<entries; i++) {
00883         sc->sample_to_chunk[i].first = get_be32(pb);
00884         sc->sample_to_chunk[i].count = get_be32(pb);
00885         sc->sample_to_chunk[i].id = get_be32(pb);
00886     }
00887     return 0;
00888 }
00889 
00890 static int mov_read_stss(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
00891 {
00892     AVStream *st = c->fc->streams[c->fc->nb_streams-1];
00893     MOVStreamContext *sc = st->priv_data;
00894     unsigned int i, entries;
00895 
00896     get_byte(pb); /* version */
00897     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */
00898 
00899     entries = get_be32(pb);
00900 
00901     if(entries >= UINT_MAX / sizeof(int))
00902         return -1;
00903 
00904     sc->keyframe_count = entries;
00905 
00906     dprintf(c->fc, "keyframe_count = %d\n", sc->keyframe_count);
00907 
00908     sc->keyframes = av_malloc(entries * sizeof(int));
00909     if (!sc->keyframes)
00910         return -1;
00911     for(i=0; i<entries; i++) {
00912         sc->keyframes[i] = get_be32(pb);
00913         //dprintf(c->fc, "keyframes[]=%d\n", sc->keyframes[i]);
00914     }
00915     return 0;
00916 }
00917 
00918 static int mov_read_stsz(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
00919 {
00920     AVStream *st = c->fc->streams[c->fc->nb_streams-1];
00921     MOVStreamContext *sc = st->priv_data;
00922     unsigned int i, entries, sample_size;
00923 
00924     get_byte(pb); /* version */
00925     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */
00926 
00927     sample_size = get_be32(pb);
00928     if (!sc->sample_size) /* do not overwrite value computed in stsd */
00929         sc->sample_size = sample_size;
00930     entries = get_be32(pb);
00931     if(entries >= UINT_MAX / sizeof(int))
00932         return -1;
00933 
00934     sc->sample_count = entries;
00935     if (sample_size)
00936         return 0;
00937 
00938     dprintf(c->fc, "sample_size = %d sample_count = %d\n", sc->sample_size, sc->sample_count);
00939 
00940     sc->sample_sizes = av_malloc(entries * sizeof(int));
00941     if (!sc->sample_sizes)
00942         return -1;
00943     for(i=0; i<entries; i++) {
00944         sc->sample_sizes[i] = get_be32(pb);
00945         dprintf(c->fc, "sample_sizes[]=%d\n", sc->sample_sizes[i]);
00946     }
00947     return 0;
00948 }
00949 
00950 static int mov_read_stts(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
00951 {
00952     AVStream *st = c->fc->streams[c->fc->nb_streams-1];
00953     MOVStreamContext *sc = st->priv_data;
00954     unsigned int i, entries;
00955     int64_t duration=0;
00956     int64_t total_sample_count=0;
00957 
00958     get_byte(pb); /* version */
00959     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */
00960     entries = get_be32(pb);
00961     if(entries >= UINT_MAX / sizeof(MOV_stts_t))
00962         return -1;
00963 
00964     sc->stts_count = entries;
00965     sc->stts_data = av_malloc(entries * sizeof(MOV_stts_t));
00966 
00967     dprintf(c->fc, "track[%i].stts.entries = %i\n", c->fc->nb_streams-1, entries);
00968 
00969     sc->time_rate=0;
00970 
00971     for(i=0; i<entries; i++) {
00972         int sample_duration;
00973         int sample_count;
00974 
00975         sample_count=get_be32(pb);
00976         sample_duration = get_be32(pb);
00977         sc->stts_data[i].count= sample_count;
00978         sc->stts_data[i].duration= sample_duration;
00979 
00980         sc->time_rate= ff_gcd(sc->time_rate, sample_duration);
00981 
00982         dprintf(c->fc, "sample_count=%d, sample_duration=%d\n",sample_count,sample_duration);
00983 
00984         duration+=(int64_t)sample_duration*sample_count;
00985         total_sample_count+=sample_count;
00986     }
00987 
00988     st->nb_frames= total_sample_count;
00989     if(duration)
00990         st->duration= duration;
00991     return 0;
00992 }
00993 
00994 static int mov_read_ctts(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
00995 {
00996     AVStream *st = c->fc->streams[c->fc->nb_streams-1];
00997     MOVStreamContext *sc = st->priv_data;
00998     unsigned int i, entries;
00999 
01000     get_byte(pb); /* version */
01001     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */
01002     entries = get_be32(pb);
01003     if(entries >= UINT_MAX / sizeof(MOV_stts_t))
01004         return -1;
01005 
01006     sc->ctts_count = entries;
01007     sc->ctts_data = av_malloc(entries * sizeof(MOV_stts_t));
01008 
01009     dprintf(c->fc, "track[%i].ctts.entries = %i\n", c->fc->nb_streams-1, entries);
01010 
01011     for(i=0; i<entries; i++) {
01012         int count    =get_be32(pb);
01013         int duration =get_be32(pb);
01014 
01015         if (duration < 0) {
01016             av_log(c->fc, AV_LOG_ERROR, "negative ctts, ignoring\n");
01017             sc->ctts_count = 0;
01018             url_fskip(pb, 8 * (entries - i - 1));
01019             break;
01020         }
01021         sc->ctts_data[i].count   = count;
01022         sc->ctts_data[i].duration= duration;
01023 
01024         sc->time_rate= ff_gcd(sc->time_rate, duration);
01025     }
01026     return 0;
01027 }
01028 
01029 static int mov_read_trak(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
01030 {
01031     AVStream *st;
01032     MOVStreamContext *sc;
01033 
01034     st = av_new_stream(c->fc, c->fc->nb_streams);
01035     if (!st) return -2;
01036     sc = av_mallocz(sizeof(MOVStreamContext));
01037     if (!sc) {
01038         av_free(st);
01039         return -1;
01040     }
01041 
01042     st->priv_data = sc;
01043     st->codec->codec_type = CODEC_TYPE_DATA;
01044     st->start_time = 0; /* XXX: check */
01045     c->streams[c->fc->nb_streams-1] = sc;
01046 
01047     return mov_read_default(c, pb, atom);
01048 }
01049 
01050 static void mov_parse_udta_string(ByteIOContext *pb, char *str, int size)
01051 {
01052     uint16_t str_size = get_be16(pb); /* string length */;
01053 
01054     get_be16(pb); /* skip language */
01055     get_buffer(pb, str, FFMIN(size, str_size));
01056 }
01057 
01058 static int mov_read_udta(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
01059 {
01060     uint64_t end = url_ftell(pb) + atom.size;
01061 
01062     while (url_ftell(pb) + 8 < end) {
01063         uint32_t tag_size = get_be32(pb);
01064         uint32_t tag      = get_le32(pb);
01065         uint64_t next     = url_ftell(pb) + tag_size - 8;
01066 
01067         if (next > end) // stop if tag_size is wrong
01068             break;
01069 
01070         switch (tag) {
01071         case MKTAG(0xa9,'n','a','m'):
01072             mov_parse_udta_string(pb, c->fc->title,     sizeof(c->fc->title));
01073             break;
01074         case MKTAG(0xa9,'w','r','t'):
01075             mov_parse_udta_string(pb, c->fc->author,    sizeof(c->fc->author));
01076             break;
01077         case MKTAG(0xa9,'c','p','y'):
01078             mov_parse_udta_string(pb, c->fc->copyright, sizeof(c->fc->copyright));
01079             break;
01080         case MKTAG(0xa9,'i','n','f'):
01081             mov_parse_udta_string(pb, c->fc->comment,   sizeof(c->fc->comment));
01082             break;
01083         default:
01084             break;
01085         }
01086 
01087         url_fseek(pb, next, SEEK_SET);
01088     }
01089 
01090     return 0;
01091 }
01092 
01093 static int mov_read_tkhd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
01094 {
01095     AVStream *st = c->fc->streams[c->fc->nb_streams-1];
01096     int version = get_byte(pb);
01097 
01098     get_byte(pb); get_byte(pb);
01099     get_byte(pb); /* flags */
01100     /*
01101     MOV_TRACK_ENABLED 0x0001
01102     MOV_TRACK_IN_MOVIE 0x0002
01103     MOV_TRACK_IN_PREVIEW 0x0004
01104     MOV_TRACK_IN_POSTER 0x0008
01105     */
01106 
01107     if (version == 1) {
01108         get_be64(pb);
01109         get_be64(pb);
01110     } else {
01111         get_be32(pb); /* creation time */
01112         get_be32(pb); /* modification time */
01113     }
01114     st->id = (int)get_be32(pb); /* track id (NOT 0 !)*/
01115     get_be32(pb); /* reserved */
01116     st->start_time = 0; /* check */
01117     (version == 1) ? get_be64(pb) : get_be32(pb); /* highlevel (considering edits) duration in movie timebase */
01118     get_be32(pb); /* reserved */
01119     get_be32(pb); /* reserved */
01120 
01121     get_be16(pb); /* layer */
01122     get_be16(pb); /* alternate group */
01123     get_be16(pb); /* volume */
01124     get_be16(pb); /* reserved */
01125 
01126     url_fskip(pb, 36); /* display matrix */
01127 
01128     /* those are fixed-point */
01129     get_be32(pb); /* track width */
01130     get_be32(pb); /* track height */
01131 
01132     return 0;
01133 }
01134 
01135 /* this atom should be null (from specs), but some buggy files put the 'moov' atom inside it... */
01136 /* like the files created with Adobe Premiere 5.0, for samples see */
01137 /* http://graphics.tudelft.nl/~wouter/publications/soundtests/ */
01138 static int mov_read_wide(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
01139 {
01140     int err;
01141 
01142     if (atom.size < 8)
01143         return 0; /* continue */
01144     if (get_be32(pb) != 0) { /* 0 sized mdat atom... use the 'wide' atom size */
01145         url_fskip(pb, atom.size - 4);
01146         return 0;
01147     }
01148     atom.type = get_le32(pb);
01149     atom.offset += 8;
01150     atom.size -= 8;
01151     if (atom.type != MKTAG('m', 'd', 'a', 't')) {
01152         url_fskip(pb, atom.size);
01153         return 0;
01154     }
01155     err = mov_read_mdat(c, pb, atom);
01156     return err;
01157 }
01158 
01159 static int mov_read_cmov(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
01160 {
01161 #ifdef CONFIG_ZLIB
01162     ByteIOContext ctx;
01163     uint8_t *cmov_data;
01164     uint8_t *moov_data; /* uncompressed data */
01165     long cmov_len, moov_len;
01166     int ret;
01167 
01168     get_be32(pb); /* dcom atom */
01169     if (get_le32(pb) != MKTAG( 'd', 'c', 'o', 'm' ))
01170         return -1;
01171     if (get_le32(pb) != MKTAG( 'z', 'l', 'i', 'b' )) {
01172         av_log(NULL, AV_LOG_ERROR, "unknown compression for cmov atom !");
01173         return -1;
01174     }
01175     get_be32(pb); /* cmvd atom */
01176     if (get_le32(pb) != MKTAG( 'c', 'm', 'v', 'd' ))
01177         return -1;
01178     moov_len = get_be32(pb); /* uncompressed size */
01179     cmov_len = atom.size - 6 * 4;
01180 
01181     cmov_data = av_malloc(cmov_len);
01182     if (!cmov_data)
01183         return -1;
01184     moov_data = av_malloc(moov_len);
01185     if (!moov_data) {
01186         av_free(cmov_data);
01187         return -1;
01188     }
01189     get_buffer(pb, cmov_data, cmov_len);
01190     if(uncompress (moov_data, (uLongf *) &moov_len, (const Bytef *)cmov_data, cmov_len) != Z_OK)
01191         return -1;
01192     if(init_put_byte(&ctx, moov_data, moov_len, 0, NULL, NULL, NULL, NULL) != 0)
01193         return -1;
01194     atom.type = MKTAG( 'm', 'o', 'o', 'v' );
01195     atom.offset = 0;
01196     atom.size = moov_len;
01197 #ifdef DEBUG
01198 //    { int fd = open("/tmp/uncompheader.mov", O_WRONLY | O_CREAT); write(fd, moov_data, moov_len); close(fd); }
01199 #endif
01200     ret = mov_read_default(c, &ctx, atom);
01201     av_free(moov_data);
01202     av_free(cmov_data);
01203     return ret;
01204 #else
01205     av_log(c->fc, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
01206     return -1;
01207 #endif
01208 }
01209 
01210 /* edit list atom */
01211 static int mov_read_elst(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
01212 {
01213     int i, edit_count;
01214 
01215     get_byte(pb); /* version */
01216     get_byte(pb); get_byte(pb); get_byte(pb); /* flags */
01217     edit_count= c->streams[c->fc->nb_streams-1]->edit_count = get_be32(pb);     /* entries */
01218 
01219     for(i=0; i<edit_count; i++){
01220         get_be32(pb); /* Track duration */
01221         get_be32(pb); /* Media time */
01222         get_be32(pb); /* Media rate */
01223     }
01224     dprintf(c->fc, "track[%i].edit_count = %i\n", c->fc->nb_streams-1, c->streams[c->fc->nb_streams-1]->edit_count);
01225     return 0;
01226 }
01227 
01228 static const MOVParseTableEntry mov_default_parse_table[] = {
01229 /* mp4 atoms */
01230 { MKTAG( 'c', 'o', '6', '4' ), mov_read_stco },
01231 { MKTAG( 'c', 't', 't', 's' ), mov_read_ctts }, /* composition time to sample */
01232 { MKTAG( 'e', 'd', 't', 's' ), mov_read_default },
01233 { MKTAG( 'e', 'l', 's', 't' ), mov_read_elst },
01234 { MKTAG( 'e', 'n', 'd', 'a' ), mov_read_enda },
01235 { MKTAG( 'f', 'i', 'e', 'l' ), mov_read_extradata },
01236 { MKTAG( 'f', 't', 'y', 'p' ), mov_read_ftyp },
01237 { MKTAG( 'h', 'd', 'l', 'r' ), mov_read_hdlr },
01238 { MKTAG( 'j', 'p', '2', 'h' ), mov_read_extradata },
01239 { MKTAG( 'm', 'd', 'a', 't' ), mov_read_mdat },
01240 { MKTAG( 'm', 'd', 'h', 'd' ), mov_read_mdhd },
01241 { MKTAG( 'm', 'd', 'i', 'a' ), mov_read_default },
01242 { MKTAG( 'm', 'i', 'n', 'f' ), mov_read_default },
01243 { MKTAG( 'm', 'o', 'o', 'v' ), mov_read_moov },
01244 { MKTAG( 'm', 'v', 'h', 'd' ), mov_read_mvhd },
01245 { MKTAG( 'S', 'M', 'I', ' ' ), mov_read_smi }, /* Sorenson extension ??? */
01246 { MKTAG( 'a', 'l', 'a', 'c' ), mov_read_extradata }, /* alac specific atom */
01247 { MKTAG( 'a', 'v', 'c', 'C' ), mov_read_avcC },
01248 { MKTAG( 's', 't', 'b', 'l' ), mov_read_default },
01249 { MKTAG( 's', 't', 'c', 'o' ), mov_read_stco },
01250 { MKTAG( 's', 't', 's', 'c' ), mov_read_stsc },
01251 { MKTAG( 's', 't', 's', 'd' ), mov_read_stsd }, /* sample description */
01252 { MKTAG( 's', 't', 's', 's' ), mov_read_stss }, /* sync sample */
01253 { MKTAG( 's', 't', 's', 'z' ), mov_read_stsz }, /* sample size */
01254 { MKTAG( 's', 't', 't', 's' ), mov_read_stts },
01255 { MKTAG( 't', 'k', 'h', 'd' ), mov_read_tkhd }, /* track header */
01256 { MKTAG( 't', 'r', 'a', 'k' ), mov_read_trak },
01257 { MKTAG( 'u', 'd', 't', 'a' ), mov_read_udta },
01258 { MKTAG( 'w', 'a', 'v', 'e' ), mov_read_wave },
01259 { MKTAG( 'e', 's', 'd', 's' ), mov_read_esds },
01260 { MKTAG( 'w', 'i', 'd', 'e' ), mov_read_wide }, /* place holder */
01261 { MKTAG( 'c', 'm', 'o', 'v' ), mov_read_cmov },
01262 { 0L, NULL }
01263 };
01264 
01265 /* XXX: is it sufficient ? */
01266 static int mov_probe(AVProbeData *p)
01267 {
01268     unsigned int offset;
01269     uint32_t tag;
01270     int score = 0;
01271 
01272     /* check file header */
01273     offset = 0;
01274     for(;;) {
01275         /* ignore invalid offset */
01276         if ((offset + 8) > (unsigned int)p->buf_size)
01277             return score;
01278         tag = AV_RL32(p->buf + offset + 4);
01279         switch(tag) {
01280         /* check for obvious tags */
01281         case MKTAG( 'j', 'P', ' ', ' ' ): /* jpeg 2000 signature */
01282         case MKTAG( 'm', 'o', 'o', 'v' ):
01283         case MKTAG( 'm', 'd', 'a', 't' ):
01284         case MKTAG( 'p', 'n', 'o', 't' ): /* detect movs with preview pics like ew.mov and april.mov */
01285         case MKTAG( 'u', 'd', 't', 'a' ): /* Packet Video PVAuthor adds this and a lot of more junk */
01286             return AVPROBE_SCORE_MAX;
01287         /* those are more common words, so rate then a bit less */
01288         case MKTAG( 'e', 'd', 'i', 'w' ): /* xdcam files have reverted first tags */
01289         case MKTAG( 'w', 'i', 'd', 'e' ):
01290         case MKTAG( 'f', 'r', 'e', 'e' ):
01291         case MKTAG( 'j', 'u', 'n', 'k' ):
01292         case MKTAG( 'p', 'i', 'c', 't' ):
01293             return AVPROBE_SCORE_MAX - 5;
01294         case MKTAG( 'f', 't', 'y', 'p' ):
01295         case MKTAG( 's', 'k', 'i', 'p' ):
01296         case MKTAG( 'u', 'u', 'i', 'd' ):
01297             offset = AV_RB32(p->buf+offset) + offset;
01298             /* if we only find those cause probedata is too small at least rate them */
01299             score = AVPROBE_SCORE_MAX - 50;
01300             break;
01301         default:
01302             /* unrecognized tag */
01303             return score;
01304         }
01305     }
01306     return score;
01307 }
01308 
01309 static void mov_build_index(MOVContext *mov, AVStream *st)
01310 {
01311     MOVStreamContext *sc = st->priv_data;
01312     offset_t current_offset;
01313     int64_t current_dts = 0;
01314     unsigned int stts_index = 0;
01315     unsigned int stsc_index = 0;
01316     unsigned int stss_index = 0;
01317     unsigned int i, j, k;
01318 
01319     if (sc->sample_sizes || st->codec->codec_type == CODEC_TYPE_VIDEO || sc->dv_audio_container) {
01320         unsigned int current_sample = 0;
01321         unsigned int stts_sample = 0;
01322         unsigned int keyframe, sample_size;
01323         unsigned int distance = 0;
01324 
01325         st->nb_frames = sc->sample_count;
01326         for (i = 0; i < sc->chunk_count; i++) {
01327             current_offset = sc->chunk_offsets[i];
01328             if (stsc_index + 1 < sc->sample_to_chunk_sz && i + 1 == sc->sample_to_chunk[stsc_index + 1].first)
01329                 stsc_index++;
01330             for (j = 0; j < sc->sample_to_chunk[stsc_index].count; j++) {
01331                 if (current_sample >= sc->sample_count) {
01332                     av_log(mov->fc, AV_LOG_ERROR, "wrong sample count\n");
01333                     goto out;
01334                 }
01335                 keyframe = !sc->keyframe_count || current_sample + 1 == sc->keyframes[stss_index];
01336                 if (keyframe) {
01337                     distance = 0;
01338                     if (stss_index + 1 < sc->keyframe_count)
01339                         stss_index++;
01340                 }
01341                 sample_size = sc->sample_size > 0 ? sc->sample_size : sc->sample_sizes[current_sample];
01342                 dprintf(mov->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", size %d, distance %d, keyframe %d\n",
01343                         st->index, current_sample, current_offset, current_dts, sample_size, distance, keyframe);
01344                 av_add_index_entry(st, current_offset, current_dts, sample_size, distance, keyframe ? AVINDEX_KEYFRAME : 0);
01345                 current_offset += sample_size;
01346                 assert(sc->stts_data[stts_index].duration % sc->time_rate == 0);
01347                 current_dts += sc->stts_data[stts_index].duration / sc->time_rate;
01348                 distance++;
01349                 stts_sample++;
01350                 current_sample++;
01351                 if (stts_index + 1 < sc->stts_count && stts_sample == sc->stts_data[stts_index].count) {
01352                     stts_sample = 0;
01353                     stts_index++;
01354                 }
01355             }
01356         }
01357     } else { /* read whole chunk */
01358         unsigned int chunk_samples, chunk_size, chunk_duration;
01359 
01360         for (i = 0; i < sc->chunk_count; i++) {
01361             current_offset = sc->chunk_offsets[i];
01362             if (stsc_index + 1 < sc->sample_to_chunk_sz && i + 1 == sc->sample_to_chunk[stsc_index + 1].first)
01363                 stsc_index++;
01364             chunk_samples = sc->sample_to_chunk[stsc_index].count;
01365             /* get chunk size */
01366             if (sc->sample_size > 1 || st->codec->codec_id == CODEC_ID_PCM_U8 || st->codec->codec_id == CODEC_ID_PCM_S8)
01367                 chunk_size = chunk_samples * sc->sample_size;
01368             else if (sc->samples_per_frame > 0 && (chunk_samples * sc->bytes_per_frame % sc->samples_per_frame == 0))
01369                 chunk_size = chunk_samples * sc->bytes_per_frame / sc->samples_per_frame;
01370             else { /* workaround to find nearest next chunk offset */
01371                 chunk_size = INT_MAX;
01372                 for (j = 0; j < mov->total_streams; j++) {
01373                     MOVStreamContext *msc = mov->streams[j];
01374 
01375                     for (k = msc->next_chunk; k < msc->chunk_count; k++) {
01376                         if (msc->chunk_offsets[k] > current_offset && msc->chunk_offsets[k] - current_offset < chunk_size) {
01377                             chunk_size = msc->chunk_offsets[k] - current_offset;
01378                             msc->next_chunk = k;
01379                             break;
01380                         }
01381                     }
01382                 }
01383                 /* check for last chunk */
01384                 if (chunk_size == INT_MAX)
01385                     for (j = 0; j < mov->mdat_count; j++) {
01386                         dprintf(mov->fc, "mdat %d, offset %"PRIx64", size %"PRId64", current offset %"PRIx64"\n",
01387                                 j, mov->mdat_list[j].offset, mov->mdat_list[j].size, current_offset);
01388                         if (mov->mdat_list[j].offset <= current_offset && mov->mdat_list[j].offset + mov->mdat_list[j].size > current_offset)
01389                             chunk_size = mov->mdat_list[j].offset + mov->mdat_list[j].size - current_offset;
01390                     }
01391                 assert(chunk_size != INT_MAX);
01392                 for (j = 0; j < mov->total_streams; j++) {
01393                     mov->streams[j]->next_chunk = 0;
01394                 }
01395             }
01396             av_add_index_entry(st, current_offset, current_dts, chunk_size, 0, AVINDEX_KEYFRAME);
01397             /* get chunk duration */
01398             chunk_duration = 0;
01399             while (chunk_samples > 0) {
01400                 if (chunk_samples < sc->stts_data[stts_index].count) {
01401                     chunk_duration += sc->stts_data[stts_index].duration * chunk_samples;
01402                     sc->stts_data[stts_index].count -= chunk_samples;
01403                     break;
01404                 } else {
01405                     chunk_duration += sc->stts_data[stts_index].duration * chunk_samples;
01406                     chunk_samples -= sc->stts_data[stts_index].count;
01407                     if (stts_index + 1 < sc->stts_count) {
01408                         stts_index++;
01409                     }
01410                 }
01411             }
01412             dprintf(mov->fc, "AVIndex stream %d, chunk %d, offset %"PRIx64", dts %"PRId64", size %d, duration %d\n",
01413                     st->index, i, current_offset, current_dts, chunk_size, chunk_duration);
01414             assert(chunk_duration % sc->time_rate == 0);
01415             current_dts += chunk_duration / sc->time_rate;
01416         }
01417     }
01418  out:
01419     /* adjust sample count to avindex entries */
01420     sc->sample_count = st->nb_index_entries;
01421 }
01422 
01423 static int mov_read_header(AVFormatContext *s, AVFormatParameters *ap)
01424 {
01425     MOVContext *mov = s->priv_data;
01426     ByteIOContext *pb = &s->pb;
01427     int i, err;
01428     MOV_atom_t atom = { 0, 0, 0 };
01429 
01430     mov->fc = s;
01431     mov->parse_table = mov_default_parse_table;
01432 
01433     if(!url_is_streamed(pb)) /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */
01434         atom.size = url_fsize(pb);
01435     else
01436         atom.size = INT64_MAX;
01437 
01438     /* check MOV header */
01439     err = mov_read_default(mov, pb, atom);
01440     if (err<0 || (!mov->found_moov && !mov->found_mdat)) {
01441         av_log(s, AV_LOG_ERROR, "mov: header not found !!! (err:%d, moov:%d, mdat:%d) pos:%"PRId64"\n",
01442                 err, mov->found_moov, mov->found_mdat, url_ftell(pb));
01443         return -1;
01444     }
01445     dprintf(mov->fc, "on_parse_exit_offset=%d\n", (int) url_ftell(pb));
01446 
01447     /* some cleanup : make sure we are on the mdat atom */
01448     if(!url_is_streamed(pb) && (url_ftell(pb) != mov->mdat_offset))
01449         url_fseek(pb, mov->mdat_offset, SEEK_SET);
01450 
01451     mov->total_streams = s->nb_streams;
01452 
01453     for(i=0; i<mov->total_streams; i++) {
01454         MOVStreamContext *sc = mov->streams[i];
01455         AVStream *st = s->streams[i];
01456         /* sanity checks */
01457         if(!sc->stts_count || !sc->chunk_count || !sc->sample_to_chunk_sz ||
01458            (!sc->sample_size && !sc->sample_count)){
01459             av_log(s, AV_LOG_ERROR, "missing mandatory atoms, broken header\n");
01460             sc->sample_count = 0; //ignore track
01461             continue;
01462         }
01463         if(!sc->time_rate)
01464             sc->time_rate=1;
01465         if(!sc->time_scale)
01466             sc->time_scale= mov->time_scale;
01467         av_set_pts_info(st, 64, sc->time_rate, sc->time_scale);
01468 
01469         if (st->codec->codec_type == CODEC_TYPE_AUDIO && sc->stts_count == 1)
01470             st->codec->frame_size = sc->stts_data[0].duration;
01471 
01472         if(st->duration != AV_NOPTS_VALUE){
01473             assert(st->duration % sc->time_rate == 0);
01474             st->duration /= sc->time_rate;
01475         }
01476         sc->ffindex = i;
01477         mov_build_index(mov, st);
01478     }
01479 
01480     for(i=0; i<mov->total_streams; i++) {
01481         /* Do not need those anymore. */
01482         av_freep(&mov->streams[i]->chunk_offsets);
01483         av_freep(&mov->streams[i]->sample_to_chunk);
01484         av_freep(&mov->streams[i]->sample_sizes);
01485         av_freep(&mov->streams[i]->keyframes);
01486         av_freep(&mov->streams[i]->stts_data);
01487     }
01488     av_freep(&mov->mdat_list);
01489     return 0;
01490 }
01491 
01492 static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)
01493 {
01494     MOVContext *mov = s->priv_data;
01495     MOVStreamContext *sc = 0;
01496     AVIndexEntry *sample = 0;
01497     int64_t best_dts = INT64_MAX;
01498     int i;
01499 
01500     for (i = 0; i < mov->total_streams; i++) {
01501         MOVStreamContext *msc = mov->streams[i];
01502 
01503         if (s->streams[i]->discard != AVDISCARD_ALL && msc->current_sample < msc->sample_count) {
01504             AVIndexEntry *current_sample = &s->streams[i]->index_entries[msc->current_sample];
01505             int64_t dts = av_rescale(current_sample->timestamp * (int64_t)msc->time_rate, AV_TIME_BASE, msc->time_scale);
01506 
01507             dprintf(s, "stream %d, sample %d, dts %"PRId64"\n", i, msc->current_sample, dts);
01508             if (dts < best_dts) {
01509                 sample = current_sample;
01510                 best_dts = dts;
01511                 sc = msc;
01512             }
01513         }
01514     }
01515     if (!sample)
01516         return -1;
01517     /* must be done just before reading, to avoid infinite loop on sample */
01518     sc->current_sample++;
01519     if (sample->pos >= url_fsize(&s->pb)) {
01520         av_log(mov->fc, AV_LOG_ERROR, "stream %d, offset 0x%"PRIx64": partial file\n", sc->ffindex, sample->pos);
01521         return -1;
01522     }
01523 #ifdef CONFIG_DV_DEMUXER
01524     if (sc->dv_audio_container) {
01525         dv_get_packet(mov->dv_demux, pkt);
01526         dprintf(s, "dv audio pkt size %d\n", pkt->size);
01527     } else {
01528 #endif
01529         url_fseek(&s->pb, sample->pos, SEEK_SET);
01530         av_get_packet(&s->pb, pkt, sample->size);
01531 #ifdef CONFIG_DV_DEMUXER
01532         if (mov->dv_demux) {
01533             void *pkt_destruct_func = pkt->destruct;
01534             dv_produce_packet(mov->dv_demux, pkt, pkt->data, pkt->size);
01535             pkt->destruct = pkt_destruct_func;
01536         }
01537     }
01538 #endif
01539     pkt->stream_index = sc->ffindex;
01540     pkt->dts = sample->timestamp;
01541     if (sc->ctts_data) {
01542         assert(sc->ctts_data[sc->sample_to_ctime_index].duration % sc->time_rate == 0);
01543         pkt->pts = pkt->dts + sc->ctts_data[sc->sample_to_ctime_index].duration / sc->time_rate;
01544         /* update ctts context */
01545         sc->sample_to_ctime_sample++;
01546         if (sc->sample_to_ctime_index < sc->ctts_count && sc->ctts_data[sc->sample_to_ctime_index].count == sc->sample_to_ctime_sample) {
01547             sc->sample_to_ctime_index++;
01548             sc->sample_to_ctime_sample = 0;
01549         }
01550     } else {
01551         pkt->pts = pkt->dts;
01552     }
01553     pkt->flags |= sample->flags & AVINDEX_KEYFRAME ? PKT_FLAG_KEY : 0;
01554     pkt->pos = sample->pos;
01555     dprintf(s, "stream %d, pts %"PRId64", dts %"PRId64", pos 0x%"PRIx64", duration %d\n", pkt->stream_index, pkt->pts, pkt->dts, pkt->pos, pkt->duration);
01556     return 0;
01557 }
01558 
01559 static int mov_seek_stream(AVStream *st, int64_t timestamp, int flags)
01560 {
01561     MOVStreamContext *sc = st->priv_data;
01562     int sample, time_sample;
01563     int i;
01564 
01565     sample = av_index_search_timestamp(st, timestamp, flags);
01566     dprintf(st->codec, "stream %d, timestamp %"PRId64", sample %d\n", st->index, timestamp, sample);
01567     if (sample < 0) /* not sure what to do */
01568         return -1;
01569     sc->current_sample = sample;
01570     dprintf(st->codec, "stream %d, found sample %d\n", st->index, sc->current_sample);
01571     /* adjust ctts index */
01572     if (sc->ctts_data) {
01573         time_sample = 0;
01574         for (i = 0; i < sc->ctts_count; i++) {
01575             int next = time_sample + sc->ctts_data[i].count;
01576             if (next > sc->current_sample) {
01577                 sc->sample_to_ctime_index = i;
01578                 sc->sample_to_ctime_sample = sc->current_sample - time_sample;
01579                 break;
01580             }
01581             time_sample = next;
01582         }
01583     }
01584     return sample;
01585 }
01586 
01587 static int mov_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
01588 {
01589     AVStream *st;
01590     int64_t seek_timestamp, timestamp;
01591     int sample;
01592     int i;
01593 
01594     if (stream_index >= s->nb_streams)
01595         return -1;
01596 
01597     st = s->streams[stream_index];
01598     sample = mov_seek_stream(st, sample_time, flags);
01599     if (sample < 0)
01600         return -1;
01601 
01602     /* adjust seek timestamp to found sample timestamp */
01603     seek_timestamp = st->index_entries[sample].timestamp;
01604 
01605     for (i = 0; i < s->nb_streams; i++) {
01606         st = s->streams[i];
01607         if (stream_index == i || st->discard == AVDISCARD_ALL)
01608             continue;
01609 
01610         timestamp = av_rescale_q(seek_timestamp, s->streams[stream_index]->time_base, st->time_base);
01611         mov_seek_stream(st, timestamp, flags);
01612     }
01613     return 0;
01614 }
01615 
01616 static int mov_read_close(AVFormatContext *s)
01617 {
01618     int i;
01619     MOVContext *mov = s->priv_data;
01620     for(i=0; i<mov->total_streams; i++) {
01621         av_freep(&mov->streams[i]->ctts_data);
01622         av_freep(&mov->streams[i]);
01623     }
01624     if(mov->dv_demux){
01625         for(i=0; i<mov->dv_fctx->nb_streams; i++){
01626             av_freep(&mov->dv_fctx->streams[i]->codec);
01627             av_freep(&mov->dv_fctx->streams[i]);
01628         }
01629         av_freep(&mov->dv_fctx);
01630         av_freep(&mov->dv_demux);
01631     }
01632     return 0;
01633 }
01634 
01635 AVInputFormat mov_demuxer = {
01636     "mov,mp4,m4a,3gp,3g2,mj2",
01637     "QuickTime/MPEG4/Motion JPEG 2000 format",
01638     sizeof(MOVContext),
01639     mov_probe,
01640     mov_read_header,
01641     mov_read_packet,
01642     mov_read_close,
01643     mov_read_seek,
01644 };