changing size segfault fix
[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
FB
22
23//#define DEBUG
155e9ee9
FB
24//#define DEBUG_SEEK
25
26typedef struct AVIIndexEntry {
27 unsigned int flags;
28 unsigned int pos;
29 unsigned int cum_len; /* sum of all lengths before this packet */
30} AVIIndexEntry;
31
32typedef struct AVIStream {
33 AVIIndexEntry *index_entries;
34 int nb_index_entries;
35 int index_entries_allocated_size;
36 int frame_offset; /* current frame (video) or byte (audio) counter
37 (used to compute the pts) */
38 int scale;
39 int rate;
40 int sample_size; /* audio only data */
1fa3d65d 41 int start;
155e9ee9
FB
42
43 int new_frame_offset; /* temporary storage (used during seek) */
44 int cum_len; /* temporary storage (used during seek) */
45} AVIStream;
de6d9b64
FB
46
47typedef struct {
7458ccbb
RS
48 int64_t riff_end;
49 int64_t movi_end;
de6d9b64 50 offset_t movi_list;
155e9ee9 51 int index_loaded;
8f9298f8 52 int is_odml;
ddaae6a9 53 DVDemuxContext* dv_demux;
de6d9b64
FB
54} AVIContext;
55
42feef6b
MN
56static int avi_load_index(AVFormatContext *s);
57
de6d9b64 58#ifdef DEBUG
1101abfe 59static void print_tag(const char *str, unsigned int tag, int size)
de6d9b64
FB
60{
61 printf("%s: tag=%c%c%c%c size=0x%x\n",
62 str, tag & 0xff,
63 (tag >> 8) & 0xff,
64 (tag >> 16) & 0xff,
65 (tag >> 24) & 0xff,
66 size);
67}
68#endif
69
06219cb1
RS
70static int get_riff(AVIContext *avi, ByteIOContext *pb)
71{
72 uint32_t tag;
73 /* check RIFF header */
74 tag = get_le32(pb);
75
76 if (tag != MKTAG('R', 'I', 'F', 'F'))
77 return -1;
78 avi->riff_end = get_le32(pb); /* RIFF chunk size */
79 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
80 tag = get_le32(pb);
81 if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
82 return -1;
83
84 return 0;
85}
86
1101abfe 87static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
de6d9b64 88{
c9a65ca8 89 AVIContext *avi = s->priv_data;
de6d9b64 90 ByteIOContext *pb = &s->pb;
deb0a292 91 uint32_t tag, tag1, handler;
b559b29b 92 int codec_type, stream_index, frame_period, bit_rate, scale, rate;
247eadca
FB
93 unsigned int size, nb_frames;
94 int i, n;
de6d9b64 95 AVStream *st;
155e9ee9 96 AVIStream *ast;
9e8cd0db 97 int xan_video = 0; /* hack to support Xan A/V */
de6d9b64 98
06219cb1 99 if (get_riff(avi, pb) < 0)
de6d9b64 100 return -1;
1101abfe 101
de6d9b64
FB
102 /* first list tag */
103 stream_index = -1;
104 codec_type = -1;
105 frame_period = 0;
106 for(;;) {
107 if (url_feof(pb))
108 goto fail;
109 tag = get_le32(pb);
110 size = get_le32(pb);
111#ifdef DEBUG
112 print_tag("tag", tag, size);
113#endif
114
115 switch(tag) {
116 case MKTAG('L', 'I', 'S', 'T'):
117 /* ignored, except when start of video packets */
118 tag1 = get_le32(pb);
119#ifdef DEBUG
120 print_tag("list", tag1, 0);
121#endif
122 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
155e9ee9 123 avi->movi_list = url_ftell(pb) - 4;
f8facaaf
MN
124 if(size) avi->movi_end = avi->movi_list + size;
125 else avi->movi_end = url_filesize(url_fileno(pb));
de6d9b64
FB
126#ifdef DEBUG
127 printf("movi end=%Lx\n", avi->movi_end);
128#endif
129 goto end_of_header;
130 }
131 break;
8f9298f8
RS
132 case MKTAG('d', 'm', 'l', 'h'):
133 avi->is_odml = 1;
134 url_fskip(pb, size + (size & 1));
135 break;
de6d9b64 136 case MKTAG('a', 'v', 'i', 'h'):
1101abfe
ZK
137 /* avi header */
138 /* using frame_period is bad idea */
de6d9b64
FB
139 frame_period = get_le32(pb);
140 bit_rate = get_le32(pb) * 8;
1101abfe 141 url_fskip(pb, 4 * 4);
247eadca
FB
142 n = get_le32(pb);
143 for(i=0;i<n;i++) {
155e9ee9 144 AVIStream *ast;
7458ccbb 145 st = av_new_stream(s, i);
de6d9b64
FB
146 if (!st)
147 goto fail;
9ee91c2f 148
155e9ee9
FB
149 ast = av_mallocz(sizeof(AVIStream));
150 if (!ast)
151 goto fail;
152 st->priv_data = ast;
1101abfe 153 }
de6d9b64
FB
154 url_fskip(pb, size - 7 * 4);
155 break;
156 case MKTAG('s', 't', 'r', 'h'):
157 /* stream header */
158 stream_index++;
159 tag1 = get_le32(pb);
7458ccbb 160 handler = get_le32(pb); /* codec tag */
cc11e2b3
MN
161#ifdef DEBUG
162 print_tag("strh", tag1, -1);
163#endif
de6d9b64 164 switch(tag1) {
deb0a292
RS
165 case MKTAG('i', 'a', 'v', 's'):
166 case MKTAG('i', 'v', 'a', 's'):
7458ccbb
RS
167 /*
168 * After some consideration -- I don't think we
169 * have to support anything but DV in a type1 AVIs.
170 */
deb0a292
RS
171 if (s->nb_streams != 1)
172 goto fail;
7458ccbb
RS
173
174 if (handler != MKTAG('d', 'v', 's', 'd') &&
175 handler != MKTAG('d', 'v', 'h', 'd') &&
176 handler != MKTAG('d', 'v', 's', 'l'))
177 goto fail;
ddaae6a9
RS
178
179 av_freep(&s->streams[0]->codec.extradata);
180 av_freep(&s->streams[0]);
181 s->nb_streams = 0;
182 avi->dv_demux = dv_init_demux(s);
7458ccbb
RS
183 if (!avi->dv_demux)
184 goto fail;
ddaae6a9
RS
185 stream_index = s->nb_streams - 1;
186 url_fskip(pb, size - 8);
187 break;
deb0a292 188 case MKTAG('v', 'i', 'd', 's'):
de6d9b64 189 codec_type = CODEC_TYPE_VIDEO;
b559b29b
MN
190
191 if (stream_index >= s->nb_streams) {
7458ccbb 192 url_fskip(pb, size - 8);
b559b29b
MN
193 break;
194 }
195
196 st = s->streams[stream_index];
155e9ee9 197 ast = st->priv_data;
76e9d392 198 st->codec.stream_codec_tag= handler;
155e9ee9 199
de6d9b64
FB
200 get_le32(pb); /* flags */
201 get_le16(pb); /* priority */
202 get_le16(pb); /* language */
203 get_le32(pb); /* XXX: initial frame ? */
deb0a292
RS
204 scale = get_le32(pb); /* scale */
205 rate = get_le32(pb); /* rate */
b559b29b 206
14bea432 207 if(scale && rate){
14bea432 208 }else if(frame_period){
155e9ee9
FB
209 rate = 1000000;
210 scale = frame_period;
14bea432 211 }else{
155e9ee9
FB
212 rate = 25;
213 scale = 1;
14bea432 214 }
155e9ee9
FB
215 ast->rate = rate;
216 ast->scale = scale;
cdd5034f 217 av_set_pts_info(st, 64, scale, rate);
155e9ee9
FB
218 st->codec.frame_rate = rate;
219 st->codec.frame_rate_base = scale;
247eadca
FB
220 get_le32(pb); /* start */
221 nb_frames = get_le32(pb);
222 st->start_time = 0;
cde073b4
MN
223 st->duration = av_rescale(nb_frames,
224 st->codec.frame_rate_base * AV_TIME_BASE,
225 st->codec.frame_rate);
247eadca 226 url_fskip(pb, size - 9 * 4);
de6d9b64
FB
227 break;
228 case MKTAG('a', 'u', 'd', 's'):
247eadca 229 {
155e9ee9 230 unsigned int length;
247eadca
FB
231
232 codec_type = CODEC_TYPE_AUDIO;
233
234 if (stream_index >= s->nb_streams) {
7458ccbb 235 url_fskip(pb, size - 8);
247eadca
FB
236 break;
237 }
238 st = s->streams[stream_index];
155e9ee9
FB
239 ast = st->priv_data;
240
247eadca
FB
241 get_le32(pb); /* flags */
242 get_le16(pb); /* priority */
243 get_le16(pb); /* language */
244 get_le32(pb); /* initial frame */
155e9ee9
FB
245 ast->scale = get_le32(pb); /* scale */
246 ast->rate = get_le32(pb);
cdd5034f 247 av_set_pts_info(st, 64, ast->scale, ast->rate);
1fa3d65d 248 ast->start= get_le32(pb); /* start */
247eadca 249 length = get_le32(pb); /* length, in samples or bytes */
155e9ee9
FB
250 get_le32(pb); /* buffer size */
251 get_le32(pb); /* quality */
252 ast->sample_size = get_le32(pb); /* sample ssize */
1fa3d65d 253//av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->scale, ast->rate, ast->sample_size, ast->start);
247eadca 254 st->start_time = 0;
cde073b4
MN
255 if (ast->rate != 0)
256 st->duration = (int64_t)length * AV_TIME_BASE / ast->rate;
155e9ee9 257 url_fskip(pb, size - 12 * 4);
247eadca 258 }
9bf9a5fc 259 break;
cc11e2b3
MN
260 case MKTAG('t', 'x', 't', 's'):
261 //FIXME
262 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
263 url_fskip(pb, size - 8);
264 break;
9bf9a5fc
MN
265 default:
266 goto fail;
de6d9b64
FB
267 }
268 break;
269 case MKTAG('s', 't', 'r', 'f'):
270 /* stream header */
7458ccbb 271 if (stream_index >= s->nb_streams || avi->dv_demux) {
de6d9b64
FB
272 url_fskip(pb, size);
273 } else {
274 st = s->streams[stream_index];
275 switch(codec_type) {
276 case CODEC_TYPE_VIDEO:
277 get_le32(pb); /* size */
278 st->codec.width = get_le32(pb);
279 st->codec.height = get_le32(pb);
de6d9b64 280 get_le16(pb); /* panes */
b559b29b 281 st->codec.bits_per_sample= get_le16(pb); /* depth */
de6d9b64 282 tag1 = get_le32(pb);
b559b29b
MN
283 get_le32(pb); /* ImageSize */
284 get_le32(pb); /* XPelsPerMeter */
285 get_le32(pb); /* YPelsPerMeter */
286 get_le32(pb); /* ClrUsed */
287 get_le32(pb); /* ClrImportant */
288
289 st->codec.extradata_size= size - 10*4;
5ae2c73e 290 st->codec.extradata= av_malloc(st->codec.extradata_size);
b559b29b 291 get_buffer(pb, st->codec.extradata, st->codec.extradata_size);
952c69c4
MN
292
293 if(st->codec.extradata_size & 1) //FIXME check if the encoder really did this correctly
294 get_byte(pb);
b559b29b 295
5e29abf8
RT
296 /* Extract palette from extradata if bpp <= 8 */
297 /* This code assumes that extradata contains only palette */
298 /* This is true for all paletted codecs implemented in ffmpeg */
299 if (st->codec.extradata_size && (st->codec.bits_per_sample <= 8)) {
300 st->codec.palctrl = av_mallocz(sizeof(AVPaletteControl));
301#ifdef WORDS_BIGENDIAN
19d053c5
RS
302 for (i = 0; i < FFMIN(st->codec.extradata_size, AVPALETTE_SIZE)/4; i++)
303 st->codec.palctrl->palette[i] = bswap_32(((uint32_t*)st->codec.extradata)[i]);
5e29abf8
RT
304#else
305 memcpy(st->codec.palctrl->palette, st->codec.extradata,
306 FFMIN(st->codec.extradata_size, AVPALETTE_SIZE));
307#endif
308 st->codec.palctrl->palette_changed = 1;
309 }
310
de6d9b64
FB
311#ifdef DEBUG
312 print_tag("video", tag1, 0);
313#endif
314 st->codec.codec_type = CODEC_TYPE_VIDEO;
315 st->codec.codec_tag = tag1;
316 st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);
9e8cd0db
MM
317 if (st->codec.codec_id == CODEC_ID_XAN_WC4)
318 xan_video = 1;
b559b29b 319// url_fskip(pb, size - 5 * 4);
de6d9b64 320 break;
9bf9a5fc 321 case CODEC_TYPE_AUDIO:
2e7973bb 322 get_wav_header(pb, &st->codec, size);
1cef9527
FR
323 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
324 url_fskip(pb, 1);
9e8cd0db
MM
325 /* special case time: To support Xan DPCM, hardcode
326 * the format if Xxan is the video codec */
155e9ee9
FB
327 st->need_parsing = 1;
328 /* force parsing as several audio frames can be in
329 one packet */
9e8cd0db
MM
330 if (xan_video)
331 st->codec.codec_id = CODEC_ID_XAN_DPCM;
de6d9b64
FB
332 break;
333 default:
75204092
MN
334 st->codec.codec_type = CODEC_TYPE_DATA;
335 st->codec.codec_id= CODEC_ID_NONE;
336 st->codec.codec_tag= 0;
de6d9b64
FB
337 url_fskip(pb, size);
338 break;
339 }
340 }
341 break;
342 default:
343 /* skip tag */
344 size += (size & 1);
345 url_fskip(pb, size);
346 break;
347 }
348 }
349 end_of_header:
350 /* check stream number */
351 if (stream_index != s->nb_streams - 1) {
352 fail:
353 for(i=0;i<s->nb_streams;i++) {
8a7b1b18 354 av_freep(&s->streams[i]->codec.extradata);
9145f8b3 355 av_freep(&s->streams[i]);
de6d9b64
FB
356 }
357 return -1;
358 }
1101abfe 359
42feef6b
MN
360 assert(!avi->index_loaded);
361 avi_load_index(s);
362 avi->index_loaded = 1;
363
de6d9b64
FB
364 return 0;
365}
366
1101abfe 367static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
de6d9b64
FB
368{
369 AVIContext *avi = s->priv_data;
370 ByteIOContext *pb = &s->pb;
8f9298f8
RS
371 int n, d[8], size;
372 offset_t i;
7458ccbb 373 void* dstr;
deb0a292 374
df99755b 375 memset(d, -1, sizeof(int)*8);
7458ccbb
RS
376
377 if (avi->dv_demux) {
378 size = dv_get_packet(avi->dv_demux, pkt);
379 if (size >= 0)
380 return size;
2af7e610 381 }
7458ccbb 382
06219cb1 383 for(i=url_ftell(pb); !url_feof(pb); i++) {
df99755b 384 int j;
1101abfe 385
8f9298f8
RS
386 if (i >= avi->movi_end) {
387 if (avi->is_odml) {
388 url_fskip(pb, avi->riff_end - i);
389 avi->riff_end = avi->movi_end = url_filesize(url_fileno(pb));
390 } else
391 break;
06219cb1
RS
392 }
393
df99755b
MN
394 for(j=0; j<7; j++)
395 d[j]= d[j+1];
396 d[7]= get_byte(pb);
397
398 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
399
400 //parse ix##
401 n= (d[2] - '0') * 10 + (d[3] - '0');
402 if( d[2] >= '0' && d[2] <= '9'
403 && d[3] >= '0' && d[3] <= '9'
404 && d[0] == 'i' && d[1] == 'x'
405 && n < s->nb_streams
406 && i + size <= avi->movi_end){
407
408 url_fskip(pb, size);
409 }
8f9298f8
RS
410
411 //parse JUNK
412 if(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K' &&
413 i + size <= avi->movi_end) {
414
415 url_fskip(pb, size);
416 }
df99755b
MN
417
418 //parse ##dc/##wb
419 n= (d[0] - '0') * 10 + (d[1] - '0');
420 if( d[0] >= '0' && d[0] <= '9'
421 && d[1] >= '0' && d[1] <= '9'
deb0a292
RS
422 && ((d[2] == 'd' && d[3] == 'c') ||
423 (d[2] == 'w' && d[3] == 'b') ||
424 (d[2] == 'd' && d[3] == 'b') ||
425 (d[2] == '_' && d[3] == '_'))
df99755b 426 && n < s->nb_streams
deb0a292 427 && i + size <= avi->movi_end) {
df99755b 428
7458ccbb 429 av_new_packet(pkt, size);
2af7e610 430 get_buffer(pb, pkt->data, size);
7458ccbb 431 if (size & 1) {
2af7e610 432 get_byte(pb);
7458ccbb
RS
433 size++;
434 }
435
436 if (avi->dv_demux) {
437 dstr = pkt->destruct;
438 size = dv_produce_packet(avi->dv_demux, pkt,
439 pkt->data, pkt->size);
440 pkt->destruct = dstr;
155e9ee9 441 pkt->flags |= PKT_FLAG_KEY;
7458ccbb 442 } else {
155e9ee9
FB
443 AVStream *st;
444 AVIStream *ast;
445 st = s->streams[n];
446 ast = st->priv_data;
cc11e2b3 447
155e9ee9 448 /* XXX: how to handle B frames in avi ? */
42feef6b
MN
449 pkt->dts = ast->frame_offset;
450// pkt->dts += ast->start;
1fa3d65d 451 if(ast->sample_size)
42feef6b 452 pkt->dts /= ast->sample_size;
f8facaaf 453//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 454 pkt->stream_index = n;
155e9ee9
FB
455 /* FIXME: We really should read index for that */
456 if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
457 if (ast->frame_offset < ast->nb_index_entries) {
458 if (ast->index_entries[ast->frame_offset].flags & AVIIF_INDEX)
459 pkt->flags |= PKT_FLAG_KEY;
460 } else {
461 /* if no index, better to say that all frames
462 are key frames */
463 pkt->flags |= PKT_FLAG_KEY;
464 }
155e9ee9 465 } else {
155e9ee9
FB
466 pkt->flags |= PKT_FLAG_KEY;
467 }
1fa3d65d
MN
468 if(ast->sample_size)
469 ast->frame_offset += pkt->size;
470 else
471 ast->frame_offset++;
7458ccbb
RS
472 }
473 return size;
df99755b
MN
474 }
475 }
df99755b 476 return -1;
de6d9b64
FB
477}
478
155e9ee9
FB
479/* XXX: we make the implicit supposition that the position are sorted
480 for each stream */
481static int avi_read_idx1(AVFormatContext *s, int size)
482{
483 ByteIOContext *pb = &s->pb;
484 int nb_index_entries, i;
485 AVStream *st;
486 AVIStream *ast;
487 AVIIndexEntry *ie, *entries;
488 unsigned int index, tag, flags, pos, len;
489
490 nb_index_entries = size / 16;
491 if (nb_index_entries <= 0)
492 return -1;
493
494 /* read the entries and sort them in each stream component */
495 for(i = 0; i < nb_index_entries; i++) {
496 tag = get_le32(pb);
497 flags = get_le32(pb);
498 pos = get_le32(pb);
499 len = get_le32(pb);
500#if defined(DEBUG_SEEK) && 0
501 printf("%d: tag=0x%x flags=0x%x pos=0x%x len=%d\n",
502 i, tag, flags, pos, len);
503#endif
504 index = ((tag & 0xff) - '0') * 10;
505 index += ((tag >> 8) & 0xff) - '0';
506 if (index >= s->nb_streams)
507 continue;
508 st = s->streams[index];
509 ast = st->priv_data;
510
511 entries = av_fast_realloc(ast->index_entries,
512 &ast->index_entries_allocated_size,
513 (ast->nb_index_entries + 1) *
514 sizeof(AVIIndexEntry));
515 if (entries) {
516 ast->index_entries = entries;
517 ie = &entries[ast->nb_index_entries++];
518 ie->flags = flags;
519 ie->pos = pos;
520 ie->cum_len = ast->cum_len;
521 ast->cum_len += len;
522 }
523 }
524 return 0;
525}
526
527static int avi_load_index(AVFormatContext *s)
528{
529 AVIContext *avi = s->priv_data;
530 ByteIOContext *pb = &s->pb;
531 uint32_t tag, size;
e6c0297f
MN
532 offset_t pos= url_ftell(pb);
533
155e9ee9
FB
534 url_fseek(pb, avi->movi_end, SEEK_SET);
535#ifdef DEBUG_SEEK
536 printf("movi_end=0x%llx\n", avi->movi_end);
537#endif
538 for(;;) {
539 if (url_feof(pb))
540 break;
541 tag = get_le32(pb);
542 size = get_le32(pb);
543#ifdef DEBUG_SEEK
544 printf("tag=%c%c%c%c size=0x%x\n",
545 tag & 0xff,
546 (tag >> 8) & 0xff,
547 (tag >> 16) & 0xff,
548 (tag >> 24) & 0xff,
549 size);
550#endif
551 switch(tag) {
552 case MKTAG('i', 'd', 'x', '1'):
553 if (avi_read_idx1(s, size) < 0)
554 goto skip;
555 else
556 goto the_end;
557 break;
558 default:
559 skip:
560 size += (size & 1);
561 url_fskip(pb, size);
562 break;
563 }
564 }
565 the_end:
e6c0297f 566 url_fseek(pb, pos, SEEK_SET);
155e9ee9
FB
567 return 0;
568}
569
570/* return the index entry whose position is immediately >= 'wanted_pos' */
571static int locate_frame_in_index(AVIIndexEntry *entries,
572 int nb_entries, int wanted_pos)
573{
574 int a, b, m, pos;
575
576 a = 0;
577 b = nb_entries - 1;
578 while (a <= b) {
579 m = (a + b) >> 1;
580 pos = entries[m].pos;
581 if (pos == wanted_pos)
582 goto found;
583 else if (pos > wanted_pos) {
584 b = m - 1;
585 } else {
586 a = m + 1;
587 }
588 }
589 m = a;
590 if (m > 0)
591 m--;
592 found:
593 return m;
594}
595
596static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp)
597{
598 AVIContext *avi = s->priv_data;
599 AVStream *st;
600 AVIStream *ast;
601 int frame_number, i;
602 int64_t pos;
603
604 if (!avi->index_loaded) {
605 /* we only load the index on demand */
606 avi_load_index(s);
607 avi->index_loaded = 1;
608 }
609 if (stream_index < 0) {
610 for(i = 0; i < s->nb_streams; i++) {
611 st = s->streams[i];
612 if (st->codec.codec_type == CODEC_TYPE_VIDEO)
613 goto found;
614 }
615 return -1;
616 found:
617 stream_index = i;
618 }
619
620 st = s->streams[stream_index];
621 if (st->codec.codec_type != CODEC_TYPE_VIDEO)
622 return -1;
623 ast = st->priv_data;
624 /* compute the frame number */
4fc2c644 625 frame_number = timestamp;
155e9ee9
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626#ifdef DEBUG_SEEK
627 printf("timestamp=%0.3f nb_indexes=%d frame_number=%d\n",
628 (double)timestamp / AV_TIME_BASE,
629 ast->nb_index_entries, frame_number);
630#endif
631 /* find a closest key frame before */
632 if (frame_number >= ast->nb_index_entries)
633 return -1;
634 while (frame_number >= 0 &&
635 !(ast->index_entries[frame_number].flags & AVIIF_INDEX))
636 frame_number--;
637 if (frame_number < 0)
638 return -1;
639 ast->new_frame_offset = frame_number;
640
641 /* find the position */
642 pos = ast->index_entries[frame_number].pos;
643
644#ifdef DEBUG_SEEK
645 printf("key_frame_number=%d pos=0x%llx\n",
646 frame_number, pos);
647#endif
648
649 /* update the frame counters for all the other stream by looking
650 at the positions just after the one found */
651 for(i = 0; i < s->nb_streams; i++) {
652 int j;
653 if (i != stream_index) {
654 st = s->streams[i];
655 ast = st->priv_data;
656 if (ast->nb_index_entries <= 0)
657 return -1;
658 j = locate_frame_in_index(ast->index_entries,
659 ast->nb_index_entries,
660 pos);
661 /* get next frame */
662 if ((j + 1) < ast->nb_index_entries)
663 j++;
664 /* extract the current frame number */
1fa3d65d 665 if (ast->sample_size==0)
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666 ast->new_frame_offset = j;
667 else
668 ast->new_frame_offset = ast->index_entries[j].cum_len;
669 }
670 }
671
672 /* everything is OK now. We can update the frame offsets */
673 for(i = 0; i < s->nb_streams; i++) {
674 st = s->streams[i];
675 ast = st->priv_data;
676 ast->frame_offset = ast->new_frame_offset;
677#ifdef DEBUG_SEEK
678 printf("%d: frame_offset=%d\n", i,
679 ast->frame_offset);
680#endif
681 }
682 /* do the seek */
683 pos += avi->movi_list;
684 url_fseek(&s->pb, pos, SEEK_SET);
685 return 0;
686}
687
1101abfe 688static int avi_read_close(AVFormatContext *s)
de6d9b64 689{
5ae2c73e
MN
690 int i;
691 AVIContext *avi = s->priv_data;
5ae2c73e
MN
692
693 for(i=0;i<s->nb_streams;i++) {
694 AVStream *st = s->streams[i];
155e9ee9 695 AVIStream *ast = st->priv_data;
3144b152
MN
696 if(ast){
697 av_free(ast->index_entries);
698 av_free(ast);
699 }
5ae2c73e 700 av_free(st->codec.extradata);
5e29abf8 701 av_free(st->codec.palctrl);
5ae2c73e
MN
702 }
703
7458ccbb
RS
704 if (avi->dv_demux)
705 av_free(avi->dv_demux);
706
c9a65ca8
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707 return 0;
708}
709
710static int avi_probe(AVProbeData *p)
711{
712 /* check file header */
713 if (p->buf_size <= 32)
714 return 0;
715 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
716 p->buf[2] == 'F' && p->buf[3] == 'F' &&
717 p->buf[8] == 'A' && p->buf[9] == 'V' &&
718 p->buf[10] == 'I' && p->buf[11] == ' ')
719 return AVPROBE_SCORE_MAX;
720 else
721 return 0;
722}
723
724static AVInputFormat avi_iformat = {
725 "avi",
726 "avi format",
727 sizeof(AVIContext),
728 avi_probe,
729 avi_read_header,
730 avi_read_packet,
731 avi_read_close,
155e9ee9 732 avi_read_seek,
c9a65ca8
FB
733};
734
735int avidec_init(void)
736{
737 av_register_input_format(&avi_iformat);
de6d9b64
FB
738 return 0;
739}