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[libav.git] / libavformat / avidec.c
CommitLineData
de6d9b64
FB		 1/*
2 * AVI decoder.
19720f15 3 * Copyright (c) 2001 Fabrice Bellard.
de6d9b64 4 *
19720f15
FB		 5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
de6d9b64 9 *
19720f15 10 * This library is distributed in the hope that it will be useful,
de6d9b64 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19720f15
FB		 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
de6d9b64 14 *
19720f15
FB		 15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
de6d9b64 18 */
de6d9b64
FB		 19#include "avformat.h"
20#include "avi.h"
7458ccbb 21#include "dv.h"
de6d9b64 22
52a0bbff
MN		 23#undef NDEBUG
24#include <assert.h>
25
de6d9b64 26//#define DEBUG
155e9ee9
FB		 27//#define DEBUG_SEEK
28
155e9ee9 29typedef struct AVIStream {
155e9ee9
FB		 30 int frame_offset; /* current frame (video) or byte (audio) counter
31 (used to compute the pts) */
32 int scale;
33 int rate;
34 int sample_size; /* audio only data */
1fa3d65d 35 int start;
155e9ee9 36
155e9ee9 37 int cum_len; /* temporary storage (used during seek) */
d2c5f0a4
MN		 38
39 int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
40 int prefix_count;
155e9ee9 41} AVIStream;
de6d9b64
FB		 42
43typedef struct {
7458ccbb
RS		 44 int64_t riff_end;
45 int64_t movi_end;
de6d9b64 46 offset_t movi_list;
155e9ee9 47 int index_loaded;
8f9298f8 48 int is_odml;
ddaae6a9 49 DVDemuxContext* dv_demux;
de6d9b64
FB		 50} AVIContext;
51
42feef6b
MN		 52static int avi_load_index(AVFormatContext *s);
53
de6d9b64 54#ifdef DEBUG
1101abfe 55static void print_tag(const char *str, unsigned int tag, int size)
de6d9b64
FB		 56{
57 printf("%s: tag=%c%c%c%c size=0x%x\n",
58 str, tag & 0xff,
59 (tag >> 8) & 0xff,
60 (tag >> 16) & 0xff,
61 (tag >> 24) & 0xff,
62 size);
63}
64#endif
65
06219cb1
RS		 66static int get_riff(AVIContext *avi, ByteIOContext *pb)
67{
68 uint32_t tag;
69 /* check RIFF header */
70 tag = get_le32(pb);
71
72 if (tag != MKTAG('R', 'I', 'F', 'F'))
73 return -1;
74 avi->riff_end = get_le32(pb); /* RIFF chunk size */
75 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
76 tag = get_le32(pb);
77 if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
78 return -1;
79
80 return 0;
81}
82
1101abfe 83static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
de6d9b64 84{
c9a65ca8 85 AVIContext *avi = s->priv_data;
de6d9b64 86 ByteIOContext *pb = &s->pb;
deb0a292 87 uint32_t tag, tag1, handler;
b559b29b 88 int codec_type, stream_index, frame_period, bit_rate, scale, rate;
247eadca
FB		 89 unsigned int size, nb_frames;
90 int i, n;
de6d9b64 91 AVStream *st;
155e9ee9 92 AVIStream *ast;
9e8cd0db 93 int xan_video = 0; /* hack to support Xan A/V */
de6d9b64 94
06219cb1 95 if (get_riff(avi, pb) < 0)
de6d9b64 96 return -1;
1101abfe 97
de6d9b64
FB		 98 /* first list tag */
99 stream_index = -1;
100 codec_type = -1;
101 frame_period = 0;
102 for(;;) {
103 if (url_feof(pb))
104 goto fail;
105 tag = get_le32(pb);
106 size = get_le32(pb);
107#ifdef DEBUG
108 print_tag("tag", tag, size);
109#endif
110
111 switch(tag) {
112 case MKTAG('L', 'I', 'S', 'T'):
113 /* ignored, except when start of video packets */
114 tag1 = get_le32(pb);
115#ifdef DEBUG
116 print_tag("list", tag1, 0);
117#endif
118 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
155e9ee9 119 avi->movi_list = url_ftell(pb) - 4;
f8facaaf
MN		 120 if(size) avi->movi_end = avi->movi_list + size;
121 else avi->movi_end = url_filesize(url_fileno(pb));
de6d9b64
FB		 122#ifdef DEBUG
123 printf("movi end=%Lx\n", avi->movi_end);
124#endif
125 goto end_of_header;
126 }
127 break;
8f9298f8
RS		 128 case MKTAG('d', 'm', 'l', 'h'):
129 avi->is_odml = 1;
130 url_fskip(pb, size + (size & 1));
131 break;
de6d9b64 132 case MKTAG('a', 'v', 'i', 'h'):
1101abfe
ZK		 133 /* avi header */
134 /* using frame_period is bad idea */
de6d9b64
FB		 135 frame_period = get_le32(pb);
136 bit_rate = get_le32(pb) * 8;
1101abfe 137 url_fskip(pb, 4 * 4);
247eadca
FB		 138 n = get_le32(pb);
139 for(i=0;i<n;i++) {
155e9ee9 140 AVIStream *ast;
7458ccbb 141 st = av_new_stream(s, i);
de6d9b64
FB		 142 if (!st)
143 goto fail;
9ee91c2f 144
155e9ee9
FB		 145 ast = av_mallocz(sizeof(AVIStream));
146 if (!ast)
147 goto fail;
148 st->priv_data = ast;
1101abfe 149 }
de6d9b64
FB		 150 url_fskip(pb, size - 7 * 4);
151 break;
152 case MKTAG('s', 't', 'r', 'h'):
153 /* stream header */
154 stream_index++;
155 tag1 = get_le32(pb);
7458ccbb 156 handler = get_le32(pb); /* codec tag */
cc11e2b3
MN		 157#ifdef DEBUG
158 print_tag("strh", tag1, -1);
159#endif
de6d9b64 160 switch(tag1) {
deb0a292
RS		 161 case MKTAG('i', 'a', 'v', 's'):
162 case MKTAG('i', 'v', 'a', 's'):
7458ccbb
RS		 163 /*
164 * After some consideration -- I don't think we
165 * have to support anything but DV in a type1 AVIs.
166 */
deb0a292
RS		 167 if (s->nb_streams != 1)
168 goto fail;
7458ccbb
RS		 169
170 if (handler != MKTAG('d', 'v', 's', 'd') &&
171 handler != MKTAG('d', 'v', 'h', 'd') &&
172 handler != MKTAG('d', 'v', 's', 'l'))
173 goto fail;
ddaae6a9 174
2c3cee34 175 ast = s->streams[0]->priv_data;
ddaae6a9
RS		 176 av_freep(&s->streams[0]->codec.extradata);
177 av_freep(&s->streams[0]);
178 s->nb_streams = 0;
179 avi->dv_demux = dv_init_demux(s);
7458ccbb
RS		 180 if (!avi->dv_demux)
181 goto fail;
2c3cee34
RS		 182 s->streams[0]->priv_data = ast;
183 url_fskip(pb, 3 * 4);
184 ast->scale = get_le32(pb);
185 ast->rate = get_le32(pb);
ddaae6a9 186 stream_index = s->nb_streams - 1;
2c3cee34 187 url_fskip(pb, size - 7*4);
ddaae6a9 188 break;
deb0a292 189 case MKTAG('v', 'i', 'd', 's'):
de6d9b64 190 codec_type = CODEC_TYPE_VIDEO;
b559b29b
MN		 191
192 if (stream_index >= s->nb_streams) {
7458ccbb 193 url_fskip(pb, size - 8);
b559b29b
MN		 194 break;
195 }
196
197 st = s->streams[stream_index];
155e9ee9 198 ast = st->priv_data;
76e9d392 199 st->codec.stream_codec_tag= handler;
155e9ee9 200
de6d9b64
FB		 201 get_le32(pb); /* flags */
202 get_le16(pb); /* priority */
203 get_le16(pb); /* language */
204 get_le32(pb); /* XXX: initial frame ? */
deb0a292
RS		 205 scale = get_le32(pb); /* scale */
206 rate = get_le32(pb); /* rate */
b559b29b 207
14bea432 208 if(scale && rate){
14bea432 209 }else if(frame_period){
155e9ee9
FB		 210 rate = 1000000;
211 scale = frame_period;
14bea432 212 }else{
155e9ee9
FB		 213 rate = 25;
214 scale = 1;
14bea432 215 }
155e9ee9
FB		 216 ast->rate = rate;
217 ast->scale = scale;
cdd5034f 218 av_set_pts_info(st, 64, scale, rate);
155e9ee9
FB		 219 st->codec.frame_rate = rate;
220 st->codec.frame_rate_base = scale;
247eadca
FB		 221 get_le32(pb); /* start */
222 nb_frames = get_le32(pb);
223 st->start_time = 0;
cde073b4 224 st->duration = av_rescale(nb_frames,
8d65750e 225 st->codec.frame_rate_base * (int64_t)AV_TIME_BASE,
cde073b4 226 st->codec.frame_rate);
247eadca 227 url_fskip(pb, size - 9 * 4);
de6d9b64
FB		 228 break;
229 case MKTAG('a', 'u', 'd', 's'):
247eadca 230 {
155e9ee9 231 unsigned int length;
247eadca
FB		 232
233 codec_type = CODEC_TYPE_AUDIO;
234
235 if (stream_index >= s->nb_streams) {
7458ccbb 236 url_fskip(pb, size - 8);
247eadca
FB		 237 break;
238 }
239 st = s->streams[stream_index];
155e9ee9
FB		 240 ast = st->priv_data;
241
247eadca
FB		 242 get_le32(pb); /* flags */
243 get_le16(pb); /* priority */
244 get_le16(pb); /* language */
245 get_le32(pb); /* initial frame */
155e9ee9
FB		 246 ast->scale = get_le32(pb); /* scale */
247 ast->rate = get_le32(pb);
55c7e4ad
MN		 248 if(!ast->rate)
249 ast->rate= 1; //wrong but better then 1/0
0fbc6961
MN		 250 if(!ast->scale)
251 ast->scale= 1; //wrong but better then 1/0
cdd5034f 252 av_set_pts_info(st, 64, ast->scale, ast->rate);
1fa3d65d 253 ast->start= get_le32(pb); /* start */
247eadca 254 length = get_le32(pb); /* length, in samples or bytes */
155e9ee9
FB		 255 get_le32(pb); /* buffer size */
256 get_le32(pb); /* quality */
257 ast->sample_size = get_le32(pb); /* sample ssize */
1fa3d65d 258//av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->scale, ast->rate, ast->sample_size, ast->start);
247eadca 259 st->start_time = 0;
cb43c0e1 260 st->duration = av_rescale(length, ast->scale*(int64_t)AV_TIME_BASE, ast->rate);
155e9ee9 261 url_fskip(pb, size - 12 * 4);
247eadca 262 }
9bf9a5fc 263 break;
cc11e2b3
MN		 264 case MKTAG('t', 'x', 't', 's'):
265 //FIXME
266 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
267 url_fskip(pb, size - 8);
268 break;
30667f42
MN		 269 case MKTAG('p', 'a', 'd', 's'):
270 codec_type = CODEC_TYPE_UNKNOWN;
271 url_fskip(pb, size - 8);
272 stream_index--;
273 break;
9bf9a5fc 274 default:
30667f42 275 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
9bf9a5fc 276 goto fail;
de6d9b64
FB		 277 }
278 break;
279 case MKTAG('s', 't', 'r', 'f'):
280 /* stream header */
7458ccbb 281 if (stream_index >= s->nb_streams || avi->dv_demux) {
de6d9b64
FB		 282 url_fskip(pb, size);
283 } else {
284 st = s->streams[stream_index];
285 switch(codec_type) {
286 case CODEC_TYPE_VIDEO:
287 get_le32(pb); /* size */
288 st->codec.width = get_le32(pb);
289 st->codec.height = get_le32(pb);
de6d9b64 290 get_le16(pb); /* panes */
b559b29b 291 st->codec.bits_per_sample= get_le16(pb); /* depth */
de6d9b64 292 tag1 = get_le32(pb);
b559b29b
MN		 293 get_le32(pb); /* ImageSize */
294 get_le32(pb); /* XPelsPerMeter */
295 get_le32(pb); /* YPelsPerMeter */
296 get_le32(pb); /* ClrUsed */
297 get_le32(pb); /* ClrImportant */
298
568e18b1 299 if(size > 10*4 && size<(1<<30)){
b559b29b 300 st->codec.extradata_size= size - 10*4;
3129cd01 301 st->codec.extradata= av_malloc(st->codec.extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
b559b29b 302 get_buffer(pb, st->codec.extradata, st->codec.extradata_size);
568e18b1 303 }
952c69c4
MN		 304
305 if(st->codec.extradata_size & 1) //FIXME check if the encoder really did this correctly
306 get_byte(pb);
b559b29b 307
5e29abf8
RT		 308 /* Extract palette from extradata if bpp <= 8 */
309 /* This code assumes that extradata contains only palette */
310 /* This is true for all paletted codecs implemented in ffmpeg */
311 if (st->codec.extradata_size && (st->codec.bits_per_sample <= 8)) {
312 st->codec.palctrl = av_mallocz(sizeof(AVPaletteControl));
313#ifdef WORDS_BIGENDIAN
19d053c5
RS		 314 for (i = 0; i < FFMIN(st->codec.extradata_size, AVPALETTE_SIZE)/4; i++)
315 st->codec.palctrl->palette[i] = bswap_32(((uint32_t*)st->codec.extradata)[i]);
5e29abf8
RT		 316#else
317 memcpy(st->codec.palctrl->palette, st->codec.extradata,
318 FFMIN(st->codec.extradata_size, AVPALETTE_SIZE));
319#endif
320 st->codec.palctrl->palette_changed = 1;
321 }
322
de6d9b64
FB		 323#ifdef DEBUG
324 print_tag("video", tag1, 0);
325#endif
326 st->codec.codec_type = CODEC_TYPE_VIDEO;
327 st->codec.codec_tag = tag1;
328 st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);
9e8cd0db
MM		 329 if (st->codec.codec_id == CODEC_ID_XAN_WC4)
330 xan_video = 1;
b559b29b 331// url_fskip(pb, size - 5 * 4);
de6d9b64 332 break;
9bf9a5fc 333 case CODEC_TYPE_AUDIO:
2e7973bb 334 get_wav_header(pb, &st->codec, size);
1cef9527
FR		 335 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
336 url_fskip(pb, 1);
9e8cd0db
MM		 337 /* special case time: To support Xan DPCM, hardcode
338 * the format if Xxan is the video codec */
155e9ee9
FB		 339 st->need_parsing = 1;
340 /* force parsing as several audio frames can be in
341 one packet */
9e8cd0db
MM		 342 if (xan_video)
343 st->codec.codec_id = CODEC_ID_XAN_DPCM;
de6d9b64
FB		 344 break;
345 default:
75204092
MN		 346 st->codec.codec_type = CODEC_TYPE_DATA;
347 st->codec.codec_id= CODEC_ID_NONE;
348 st->codec.codec_tag= 0;
de6d9b64
FB		 349 url_fskip(pb, size);
350 break;
351 }
352 }
353 break;
354 default:
355 /* skip tag */
356 size += (size & 1);
357 url_fskip(pb, size);
358 break;
359 }
360 }
361 end_of_header:
362 /* check stream number */
363 if (stream_index != s->nb_streams - 1) {
364 fail:
365 for(i=0;i<s->nb_streams;i++) {
8a7b1b18 366 av_freep(&s->streams[i]->codec.extradata);
9145f8b3 367 av_freep(&s->streams[i]);
de6d9b64
FB		 368 }
369 return -1;
370 }
1101abfe 371
42feef6b
MN		 372 assert(!avi->index_loaded);
373 avi_load_index(s);
374 avi->index_loaded = 1;
375
de6d9b64
FB		 376 return 0;
377}
378
1101abfe 379static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
de6d9b64
FB		 380{
381 AVIContext *avi = s->priv_data;
382 ByteIOContext *pb = &s->pb;
8f9298f8 383 int n, d[8], size;
4a8d5135 384 offset_t i, sync;
7458ccbb 385 void* dstr;
7458ccbb
RS		 386
387 if (avi->dv_demux) {
388 size = dv_get_packet(avi->dv_demux, pkt);
389 if (size >= 0)
390 return size;
2af7e610 391 }
4a8d5135
MN		 392
393resync:
394 memset(d, -1, sizeof(int)*8);
395 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
df99755b 396 int j;
1101abfe 397
8f9298f8
RS		 398 if (i >= avi->movi_end) {
399 if (avi->is_odml) {
400 url_fskip(pb, avi->riff_end - i);
401 avi->riff_end = avi->movi_end = url_filesize(url_fileno(pb));
402 } else
403 break;
06219cb1
RS		 404 }
405
df99755b
MN		 406 for(j=0; j<7; j++)
407 d[j]= d[j+1];
408 d[7]= get_byte(pb);
409
410 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
411
df99755b 412 if( d[2] >= '0' && d[2] <= '9'
d2c5f0a4
MN		 413 && d[3] >= '0' && d[3] <= '9'){
414 n= (d[2] - '0') * 10 + (d[3] - '0');
415 }else{
416 n= 100; //invalid stream id
df99755b 417 }
d2c5f0a4
MN		 418//av_log(NULL, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %lld %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
419 if(i + size > avi->movi_end || d[0]<0)
420 continue;
421
422 //parse ix##
423 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
8f9298f8 424 //parse JUNK
d2c5f0a4 425 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')){
8f9298f8 426 url_fskip(pb, size);
d2c5f0a4 427//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
4a8d5135 428 goto resync;
8f9298f8 429 }
d2c5f0a4 430
df99755b 431 if( d[0] >= '0' && d[0] <= '9'
d2c5f0a4
MN		 432 && d[1] >= '0' && d[1] <= '9'){
433 n= (d[0] - '0') * 10 + (d[1] - '0');
434 }else{
435 n= 100; //invalid stream id
436 }
df99755b 437
d2c5f0a4
MN		 438 //parse ##dc/##wb
439 if(n < s->nb_streams){
440 AVStream *st;
441 AVIStream *ast;
442 st = s->streams[n];
443 ast = st->priv_data;
b4aea108
MN		 444
445 if(st->discard){
446 url_fskip(pb, size);
447 goto resync;
448 }
d2c5f0a4 449
4a8d5135 450 if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
d2c5f0a4
MN		 451 d[2]*256+d[3] == ast->prefix /*||
452 (d[2] == 'd' && d[3] == 'c') ||
453 (d[2] == 'w' && d[3] == 'b')*/) {
454
455//av_log(NULL, AV_LOG_DEBUG, "OK\n");
456 if(d[2]*256+d[3] == ast->prefix)
457 ast->prefix_count++;
458 else{
459 ast->prefix= d[2]*256+d[3];
460 ast->prefix_count= 0;
461 }
462
7458ccbb 463 av_new_packet(pkt, size);
2af7e610 464 get_buffer(pb, pkt->data, size);
7458ccbb 465 if (size & 1) {
2af7e610 466 get_byte(pb);
7458ccbb
RS		 467 size++;
468 }
469
470 if (avi->dv_demux) {
471 dstr = pkt->destruct;
472 size = dv_produce_packet(avi->dv_demux, pkt,
473 pkt->data, pkt->size);
474 pkt->destruct = dstr;
155e9ee9 475 pkt->flags |= PKT_FLAG_KEY;
7458ccbb 476 } else {
155e9ee9 477 /* XXX: how to handle B frames in avi ? */
42feef6b
MN		 478 pkt->dts = ast->frame_offset;
479// pkt->dts += ast->start;
1fa3d65d 480 if(ast->sample_size)
42feef6b 481 pkt->dts /= ast->sample_size;
f8facaaf 482//av_log(NULL, AV_LOG_DEBUG, "dts:%Ld offset:%d %d/%d smpl_siz:%d base:%d st:%d size:%d\n", pkt->dts, ast->frame_offset, ast->scale, ast->rate, ast->sample_size, AV_TIME_BASE, n, size);
7458ccbb 483 pkt->stream_index = n;
52a0bbff 484
155e9ee9 485 if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
52a0bbff
MN		 486 if(st->index_entries){
487 AVIndexEntry *e;
488 int index;
489
490 index= av_index_search_timestamp(st, pkt->dts, 0);
491 e= &st->index_entries[index];
492
493 if(e->timestamp == ast->frame_offset){
494 if (e->flags & AVINDEX_KEYFRAME)
495 pkt->flags |= PKT_FLAG_KEY;
496 }
155e9ee9
FB		 497 } else {
498 /* if no index, better to say that all frames
499 are key frames */
500 pkt->flags |= PKT_FLAG_KEY;
501 }
155e9ee9 502 } else {
155e9ee9
FB		 503 pkt->flags |= PKT_FLAG_KEY;
504 }
1fa3d65d
MN		 505 if(ast->sample_size)
506 ast->frame_offset += pkt->size;
507 else
508 ast->frame_offset++;
7458ccbb
RS		 509 }
510 return size;
d2c5f0a4 511 }
df99755b 512 }
69bde0b2
MM		 513 /* palette changed chunk */
514 if ( d[0] >= '0' && d[0] <= '9'
515 && d[1] >= '0' && d[1] <= '9'
516 && ((d[2] == 'p' && d[3] == 'c'))
517 && n < s->nb_streams && i + size <= avi->movi_end) {
518
519 AVStream *st;
520 int first, clr, flags, k, p;
521
522 st = s->streams[n];
523
524 first = get_byte(pb);
525 clr = get_byte(pb);
61c52ead
KS		 526 if(!clr) /* all 256 colors used */
527 clr = 256;
69bde0b2
MM		 528 flags = get_le16(pb);
529 p = 4;
530 for (k = first; k < clr + first; k++) {
531 int r, g, b;
532 r = get_byte(pb);
533 g = get_byte(pb);
534 b = get_byte(pb);
535 get_byte(pb);
536 st->codec.palctrl->palette[k] = b + (g << 8) + (r << 16);
537 }
538 st->codec.palctrl->palette_changed = 1;
4a8d5135 539 goto resync;
69bde0b2
MM		 540 }
541
df99755b 542 }
d2c5f0a4 543
df99755b 544 return -1;
de6d9b64
FB		 545}
546
155e9ee9
FB		 547/* XXX: we make the implicit supposition that the position are sorted
548 for each stream */
549static int avi_read_idx1(AVFormatContext *s, int size)
550{
551 ByteIOContext *pb = &s->pb;
552 int nb_index_entries, i;
553 AVStream *st;
554 AVIStream *ast;
155e9ee9
FB		 555 unsigned int index, tag, flags, pos, len;
556
557 nb_index_entries = size / 16;
558 if (nb_index_entries <= 0)
559 return -1;
560
561 /* read the entries and sort them in each stream component */
562 for(i = 0; i < nb_index_entries; i++) {
563 tag = get_le32(pb);
564 flags = get_le32(pb);
565 pos = get_le32(pb);
566 len = get_le32(pb);
52a0bbff
MN		 567#if defined(DEBUG_SEEK)
568 av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
155e9ee9
FB		 569 i, tag, flags, pos, len);
570#endif
571 index = ((tag & 0xff) - '0') * 10;
572 index += ((tag >> 8) & 0xff) - '0';
573 if (index >= s->nb_streams)
574 continue;
575 st = s->streams[index];
576 ast = st->priv_data;
577
52a0bbff
MN		 578 if(ast->sample_size)
579 len /= ast->sample_size;
580 else
581 len = 1;
582#if defined(DEBUG_SEEK)
583 av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%d\n", len, ast->cum_len);
584#endif
585 av_add_index_entry(st, pos, ast->cum_len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
586 ast->cum_len += len;
155e9ee9
FB		 587 }
588 return 0;
589}
590
591static int avi_load_index(AVFormatContext *s)
592{
593 AVIContext *avi = s->priv_data;
594 ByteIOContext *pb = &s->pb;
595 uint32_t tag, size;
e6c0297f
MN		 596 offset_t pos= url_ftell(pb);
597
155e9ee9
FB		 598 url_fseek(pb, avi->movi_end, SEEK_SET);
599#ifdef DEBUG_SEEK
600 printf("movi_end=0x%llx\n", avi->movi_end);
601#endif
602 for(;;) {
603 if (url_feof(pb))
604 break;
605 tag = get_le32(pb);
606 size = get_le32(pb);
607#ifdef DEBUG_SEEK
608 printf("tag=%c%c%c%c size=0x%x\n",
609 tag & 0xff,
610 (tag >> 8) & 0xff,
611 (tag >> 16) & 0xff,
612 (tag >> 24) & 0xff,
613 size);
614#endif
615 switch(tag) {
616 case MKTAG('i', 'd', 'x', '1'):
617 if (avi_read_idx1(s, size) < 0)
618 goto skip;
619 else
620 goto the_end;
621 break;
622 default:
623 skip:
624 size += (size & 1);
625 url_fskip(pb, size);
626 break;
627 }
628 }
629 the_end:
e6c0297f 630 url_fseek(pb, pos, SEEK_SET);
155e9ee9
FB		 631 return 0;
632}
633
7b3c1382 634static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
155e9ee9
FB		 635{
636 AVIContext *avi = s->priv_data;
637 AVStream *st;
52a0bbff 638 int i, index;
155e9ee9
FB		 639 int64_t pos;
640
641 if (!avi->index_loaded) {
642 /* we only load the index on demand */
643 avi_load_index(s);
644 avi->index_loaded = 1;
645 }
52a0bbff 646 assert(stream_index>= 0);
155e9ee9
FB		 647
648 st = s->streams[stream_index];
52a0bbff
MN		 649 index= av_index_search_timestamp(st, timestamp, flags);
650 if(index<0)
155e9ee9 651 return -1;
52a0bbff 652
155e9ee9 653 /* find the position */
52a0bbff
MN		 654 pos = st->index_entries[index].pos;
655 timestamp = st->index_entries[index].timestamp;
656
657// av_log(NULL, AV_LOG_DEBUG, "XX %Ld %d %Ld\n", timestamp, index, st->index_entries[index].timestamp);
155e9ee9 658
155e9ee9 659 for(i = 0; i < s->nb_streams; i++) {
52a0bbff
MN		 660 AVStream *st2 = s->streams[i];
661 AVIStream *ast2 = st2->priv_data;
662 if (st2->nb_index_entries <= 0)
663 continue;
664
665// assert(st2->codec.block_align);
666 assert(st2->time_base.den == ast2->rate);
667 assert(st2->time_base.num == ast2->scale);
668 index = av_index_search_timestamp(
669 st2,
670 av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
671 flags | AVSEEK_FLAG_BACKWARD);
672 if(index<0)
673 index=0;
674#if 1
675 while(index>0 && st2->index_entries[index].pos > pos)
676 index--;
677 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
678 index++;
155e9ee9 679#endif
52a0bbff
MN		 680// av_log(NULL, AV_LOG_DEBUG, "%Ld %d %Ld\n", timestamp, index, st2->index_entries[index].timestamp);
681 /* extract the current frame number */
682 ast2->frame_offset = st2->index_entries[index].timestamp;
683 if(ast2->sample_size)
684 ast2->frame_offset *=ast2->sample_size;
155e9ee9 685 }
52a0bbff 686
664f5836
RS		 687 if (avi->dv_demux)
688 dv_flush_audio_packets(avi->dv_demux);
155e9ee9
FB		 689 /* do the seek */
690 pos += avi->movi_list;
691 url_fseek(&s->pb, pos, SEEK_SET);
692 return 0;
693}
694
1101abfe 695static int avi_read_close(AVFormatContext *s)
de6d9b64 696{
5ae2c73e
MN		 697 int i;
698 AVIContext *avi = s->priv_data;
5ae2c73e
MN		 699
700 for(i=0;i<s->nb_streams;i++) {
701 AVStream *st = s->streams[i];
155e9ee9 702 AVIStream *ast = st->priv_data;
52a0bbff 703 av_free(ast);
5ae2c73e 704 av_free(st->codec.extradata);
5e29abf8 705 av_free(st->codec.palctrl);
5ae2c73e
MN		 706 }
707
7458ccbb
RS		 708 if (avi->dv_demux)
709 av_free(avi->dv_demux);
710
c9a65ca8
FB		 711 return 0;
712}
713
714static int avi_probe(AVProbeData *p)
715{
716 /* check file header */
717 if (p->buf_size <= 32)
718 return 0;
719 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
720 p->buf[2] == 'F' && p->buf[3] == 'F' &&
721 p->buf[8] == 'A' && p->buf[9] == 'V' &&
722 p->buf[10] == 'I' && p->buf[11] == ' ')
723 return AVPROBE_SCORE_MAX;
724 else
725 return 0;
726}
727
728static AVInputFormat avi_iformat = {
729 "avi",
730 "avi format",
731 sizeof(AVIContext),
732 avi_probe,
733 avi_read_header,
734 avi_read_packet,
735 avi_read_close,
155e9ee9 736 avi_read_seek,
c9a65ca8
FB		 737};
738
739int avidec_init(void)
740{
741 av_register_input_format(&avi_iformat);
de6d9b64
FB		 742 return 0;
743}
Libav master