bandaid fix for broken shared library installation
[libav.git] / libavformat / avidec.c
CommitLineData
de6d9b64 1/*
7fbde343 2 * AVI demuxer
19720f15 3 * Copyright (c) 2001 Fabrice Bellard.
de6d9b64 4 *
b78e7197
DB
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
19720f15
FB
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
b78e7197 10 * version 2.1 of the License, or (at your option) any later version.
de6d9b64 11 *
b78e7197 12 * FFmpeg is distributed in the hope that it will be useful,
de6d9b64 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19720f15
FB
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
de6d9b64 16 *
19720f15 17 * You should have received a copy of the GNU Lesser General Public
b78e7197 18 * License along with FFmpeg; if not, write to the Free Software
5509bffa 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
de6d9b64 20 */
de6d9b64
FB
21#include "avformat.h"
22#include "avi.h"
7458ccbb 23#include "dv.h"
9d9f4119 24#include "riff.h"
de6d9b64 25
52a0bbff
MN
26#undef NDEBUG
27#include <assert.h>
28
de6d9b64 29//#define DEBUG
155e9ee9
FB
30//#define DEBUG_SEEK
31
155e9ee9 32typedef struct AVIStream {
7c7f3866 33 int64_t frame_offset; /* current frame (video) or byte (audio) counter
155e9ee9 34 (used to compute the pts) */
7c7f3866
MN
35 int remaining;
36 int packet_size;
37
155e9ee9 38 int scale;
115329f1 39 int rate;
8223bca5 40 int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
115329f1 41
94d1d6c0 42 int64_t cum_len; /* temporary storage (used during seek) */
115329f1 43
d2c5f0a4
MN
44 int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
45 int prefix_count;
b7c40744
MN
46 uint32_t pal[256];
47 int has_pal;
155e9ee9 48} AVIStream;
de6d9b64
FB
49
50typedef struct {
7458ccbb
RS
51 int64_t riff_end;
52 int64_t movi_end;
ea4b2b5e 53 int64_t fsize;
de6d9b64 54 offset_t movi_list;
155e9ee9 55 int index_loaded;
8f9298f8 56 int is_odml;
7c7f3866
MN
57 int non_interleaved;
58 int stream_index;
ddaae6a9 59 DVDemuxContext* dv_demux;
de6d9b64
FB
60} AVIContext;
61
7b31b092
AJ
62static const char avi_headers[][8] = {
63 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
64 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
65 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
b925ef61 66 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
0b04ebb3 67 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
7b31b092
AJ
68 { 0 }
69};
70
42feef6b 71static int avi_load_index(AVFormatContext *s);
30a43f2d 72static int guess_ni_flag(AVFormatContext *s);
42feef6b 73
de6d9b64 74#ifdef DEBUG
1101abfe 75static void print_tag(const char *str, unsigned int tag, int size)
de6d9b64
FB
76{
77 printf("%s: tag=%c%c%c%c size=0x%x\n",
78 str, tag & 0xff,
79 (tag >> 8) & 0xff,
80 (tag >> 16) & 0xff,
81 (tag >> 24) & 0xff,
82 size);
83}
84#endif
85
06219cb1
RS
86static int get_riff(AVIContext *avi, ByteIOContext *pb)
87{
7b31b092
AJ
88 char header[8];
89 int i;
06219cb1 90
7b31b092
AJ
91 /* check RIFF header */
92 get_buffer(pb, header, 4);
06219cb1
RS
93 avi->riff_end = get_le32(pb); /* RIFF chunk size */
94 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
7b31b092
AJ
95 get_buffer(pb, header+4, 4);
96
97 for(i=0; avi_headers[i][0]; i++)
98 if(!memcmp(header, avi_headers[i], 8))
99 break;
100 if(!avi_headers[i][0])
06219cb1 101 return -1;
115329f1 102
7b31b092
AJ
103 if(header[7] == 0x19)
104 av_log(NULL, AV_LOG_INFO, "file has been generated with a totally broken muxer\n");
105
06219cb1
RS
106 return 0;
107}
108
94d1d6c0 109static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
8945ebb9 110 AVIContext *avi = s->priv_data;
899681cd 111 ByteIOContext *pb = s->pb;
94d1d6c0
MN
112 int longs_pre_entry= get_le16(pb);
113 int index_sub_type = get_byte(pb);
114 int index_type = get_byte(pb);
115 int entries_in_use = get_le32(pb);
116 int chunk_id = get_le32(pb);
117 int64_t base = get_le64(pb);
118 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
119 AVStream *st;
120 AVIStream *ast;
121 int i;
8945ebb9 122 int64_t last_pos= -1;
899681cd 123 int64_t filesize= url_fsize(s->pb);
94d1d6c0 124
965a63af 125#ifdef DEBUG_SEEK
949b1a13 126 av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
965a63af
MN
127 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
128#endif
94d1d6c0
MN
129
130 if(stream_id > s->nb_streams || stream_id < 0)
131 return -1;
132 st= s->streams[stream_id];
133 ast = st->priv_data;
134
135 if(index_sub_type)
136 return -1;
137
138 get_le32(pb);
139
140 if(index_type && longs_pre_entry != 2)
141 return -1;
142 if(index_type>1)
143 return -1;
144
965a63af
MN
145 if(filesize > 0 && base >= filesize){
146 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
147 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
148 base &= 0xFFFFFFFF;
149 else
150 return -1;
151 }
152
94d1d6c0
MN
153 for(i=0; i<entries_in_use; i++){
154 if(index_type){
30a43f2d 155 int64_t pos= get_le32(pb) + base - 8;
94d1d6c0 156 int len = get_le32(pb);
30a43f2d 157 int key= len >= 0;
94d1d6c0
MN
158 len &= 0x7FFFFFFF;
159
965a63af 160#ifdef DEBUG_SEEK
949b1a13 161 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
965a63af 162#endif
8945ebb9
MN
163 if(last_pos == pos || pos == base - 8)
164 avi->non_interleaved= 1;
165 else
2b70eb2b 166 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
30a43f2d 167
94d1d6c0 168 if(ast->sample_size)
2b70eb2b 169 ast->cum_len += len;
94d1d6c0
MN
170 else
171 ast->cum_len ++;
8945ebb9 172 last_pos= pos;
94d1d6c0 173 }else{
26b89135
MR
174 int64_t offset, pos;
175 int duration;
176 offset = get_le64(pb);
177 get_le32(pb); /* size */
178 duration = get_le32(pb);
179 pos = url_ftell(pb);
94d1d6c0
MN
180
181 url_fseek(pb, offset+8, SEEK_SET);
182 read_braindead_odml_indx(s, frame_num);
183 frame_num += duration;
184
185 url_fseek(pb, pos, SEEK_SET);
186 }
187 }
965a63af 188 avi->index_loaded=1;
94d1d6c0
MN
189 return 0;
190}
191
115e8ae5 192static void clean_index(AVFormatContext *s){
965a63af
MN
193 int i;
194 int64_t j;
115e8ae5
MN
195
196 for(i=0; i<s->nb_streams; i++){
197 AVStream *st = s->streams[i];
198 AVIStream *ast = st->priv_data;
199 int n= st->nb_index_entries;
200 int max= ast->sample_size;
201 int64_t pos, size, ts;
202
203 if(n != 1 || ast->sample_size==0)
204 continue;
205
206 while(max < 1024) max+=max;
207
208 pos= st->index_entries[0].pos;
209 size= st->index_entries[0].size;
210 ts= st->index_entries[0].timestamp;
211
212 for(j=0; j<size; j+=max){
213 av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
214 }
215 }
216}
217
57060f89
DC
218static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen, unsigned int size)
219{
220 offset_t i = url_ftell(pb);
221 size += (size & 1);
222 get_strz(pb, buf, maxlen);
223 url_fseek(pb, i+size, SEEK_SET);
224 return 0;
225}
226
1101abfe 227static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
de6d9b64 228{
c9a65ca8 229 AVIContext *avi = s->priv_data;
899681cd 230 ByteIOContext *pb = s->pb;
deb0a292 231 uint32_t tag, tag1, handler;
b53f1064 232 int codec_type, stream_index, frame_period, bit_rate;
247eadca 233 unsigned int size, nb_frames;
6d29fba9 234 int i;
de6d9b64 235 AVStream *st;
26b89135 236 AVIStream *ast = NULL;
2ad4648f 237 char str_track[4];
0b04ebb3
VV
238 int avih_width=0, avih_height=0;
239 int amv_file_format=0;
de6d9b64 240
7c7f3866 241 avi->stream_index= -1;
115329f1 242
06219cb1 243 if (get_riff(avi, pb) < 0)
de6d9b64 244 return -1;
1101abfe 245
ea4b2b5e
MN
246 avi->fsize = url_fsize(pb);
247 if(avi->fsize<=0)
248 avi->fsize= avi->riff_end;
249
de6d9b64
FB
250 /* first list tag */
251 stream_index = -1;
252 codec_type = -1;
253 frame_period = 0;
254 for(;;) {
255 if (url_feof(pb))
256 goto fail;
257 tag = get_le32(pb);
258 size = get_le32(pb);
259#ifdef DEBUG
260 print_tag("tag", tag, size);
261#endif
262
263 switch(tag) {
264 case MKTAG('L', 'I', 'S', 'T'):
265 /* ignored, except when start of video packets */
266 tag1 = get_le32(pb);
267#ifdef DEBUG
268 print_tag("list", tag1, 0);
269#endif
270 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
155e9ee9 271 avi->movi_list = url_ftell(pb) - 4;
2064c77a 272 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
a965c478 273 else avi->movi_end = url_fsize(pb);
de6d9b64 274#ifdef DEBUG
949b1a13 275 printf("movi end=%"PRIx64"\n", avi->movi_end);
de6d9b64
FB
276#endif
277 goto end_of_header;
278 }
279 break;
8f9298f8 280 case MKTAG('d', 'm', 'l', 'h'):
bb270c08
DB
281 avi->is_odml = 1;
282 url_fskip(pb, size + (size & 1));
283 break;
0b04ebb3
VV
284 case MKTAG('a', 'm', 'v', 'h'):
285 amv_file_format=1;
de6d9b64 286 case MKTAG('a', 'v', 'i', 'h'):
bb270c08 287 /* avi header */
1101abfe 288 /* using frame_period is bad idea */
de6d9b64
FB
289 frame_period = get_le32(pb);
290 bit_rate = get_le32(pb) * 8;
1894edeb
MN
291 get_le32(pb);
292 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
293
294 url_fskip(pb, 2 * 4);
6d29fba9 295 get_le32(pb);
0b04ebb3
VV
296 get_le32(pb);
297 avih_width=get_le32(pb);
298 avih_height=get_le32(pb);
6d29fba9 299
0b04ebb3 300 url_fskip(pb, size - 10 * 4);
6d29fba9
MN
301 break;
302 case MKTAG('s', 't', 'r', 'h'):
303 /* stream header */
304
305 tag1 = get_le32(pb);
306 handler = get_le32(pb); /* codec tag */
307
308 if(tag1 == MKTAG('p', 'a', 'd', 's')){
309 url_fskip(pb, size - 8);
310 break;
311 }else{
312 stream_index++;
313 st = av_new_stream(s, stream_index);
de6d9b64
FB
314 if (!st)
315 goto fail;
9ee91c2f 316
155e9ee9
FB
317 ast = av_mallocz(sizeof(AVIStream));
318 if (!ast)
319 goto fail;
320 st->priv_data = ast;
bb270c08 321 }
0b04ebb3
VV
322 if(amv_file_format)
323 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
6d29fba9 324
cc11e2b3 325#ifdef DEBUG
e344c1ea 326 print_tag("strh", tag1, -1);
cc11e2b3 327#endif
b53f1064 328 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
6eb2de74
RS
329 int64_t dv_dur;
330
115329f1 331 /*
bb270c08
DB
332 * After some consideration -- I don't think we
333 * have to support anything but DV in a type1 AVIs.
334 */
335 if (s->nb_streams != 1)
336 goto fail;
337
338 if (handler != MKTAG('d', 'v', 's', 'd') &&
339 handler != MKTAG('d', 'v', 'h', 'd') &&
340 handler != MKTAG('d', 'v', 's', 'l'))
341 goto fail;
342
343 ast = s->streams[0]->priv_data;
344 av_freep(&s->streams[0]->codec->extradata);
345 av_freep(&s->streams[0]);
346 s->nb_streams = 0;
a2a6332b 347 if (ENABLE_DV_DEMUXER) {
38ca53da
AJ
348 avi->dv_demux = dv_init_demux(s);
349 if (!avi->dv_demux)
350 goto fail;
a2a6332b 351 }
bb270c08
DB
352 s->streams[0]->priv_data = ast;
353 url_fskip(pb, 3 * 4);
354 ast->scale = get_le32(pb);
355 ast->rate = get_le32(pb);
6eb2de74
RS
356 url_fskip(pb, 4); /* start time */
357
358 dv_dur = get_le32(pb);
359 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
360 dv_dur *= AV_TIME_BASE;
361 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
362 }
363 /*
364 * else, leave duration alone; timing estimation in utils.c
365 * will make a guess based on bit rate.
366 */
367
bb270c08 368 stream_index = s->nb_streams - 1;
6eb2de74 369 url_fskip(pb, size - 9*4);
b53f1064
MN
370 break;
371 }
b559b29b 372
6d29fba9 373 assert(stream_index < s->nb_streams);
01f4895c 374 st->codec->stream_codec_tag= handler;
b559b29b 375
b53f1064
MN
376 get_le32(pb); /* flags */
377 get_le16(pb); /* priority */
378 get_le16(pb); /* language */
379 get_le32(pb); /* initial frame */
380 ast->scale = get_le32(pb);
381 ast->rate = get_le32(pb);
382 if(ast->scale && ast->rate){
383 }else if(frame_period){
384 ast->rate = 1000000;
385 ast->scale = frame_period;
386 }else{
387 ast->rate = 25;
388 ast->scale = 1;
389 }
390 av_set_pts_info(st, 64, ast->scale, ast->rate);
115329f1 391
b72a2bc8 392 ast->cum_len=get_le32(pb); /* start */
b53f1064 393 nb_frames = get_le32(pb);
b559b29b 394
b53f1064 395 st->start_time = 0;
c0df9d75 396 st->duration = nb_frames;
b53f1064
MN
397 get_le32(pb); /* buffer size */
398 get_le32(pb); /* quality */
399 ast->sample_size = get_le32(pb); /* sample ssize */
2b70eb2b 400 ast->cum_len *= FFMAX(1, ast->sample_size);
b53f1064 401// av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
247eadca 402
b53f1064 403 switch(tag1) {
bb270c08 404 case MKTAG('v', 'i', 'd', 's'):
b53f1064 405 codec_type = CODEC_TYPE_VIDEO;
247eadca 406
b53f1064 407 ast->sample_size = 0;
b53f1064
MN
408 break;
409 case MKTAG('a', 'u', 'd', 's'):
410 codec_type = CODEC_TYPE_AUDIO;
9bf9a5fc 411 break;
cc11e2b3 412 case MKTAG('t', 'x', 't', 's'):
115329f1 413 //FIXME
cc11e2b3 414 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
cc11e2b3 415 break;
9bf9a5fc 416 default:
30667f42 417 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
9bf9a5fc 418 goto fail;
de6d9b64 419 }
2b70eb2b 420 ast->frame_offset= ast->cum_len;
b53f1064 421 url_fskip(pb, size - 12 * 4);
de6d9b64
FB
422 break;
423 case MKTAG('s', 't', 'r', 'f'):
424 /* stream header */
6d29fba9 425 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
de6d9b64
FB
426 url_fskip(pb, size);
427 } else {
428 st = s->streams[stream_index];
429 switch(codec_type) {
430 case CODEC_TYPE_VIDEO:
0b04ebb3
VV
431 if(amv_file_format){
432 st->codec->width=avih_width;
433 st->codec->height=avih_height;
434 st->codec->codec_type = CODEC_TYPE_VIDEO;
435 st->codec->codec_id = CODEC_ID_AMV;
436 url_fskip(pb, size);
437 break;
438 }
de6d9b64 439 get_le32(pb); /* size */
01f4895c
MN
440 st->codec->width = get_le32(pb);
441 st->codec->height = get_le32(pb);
de6d9b64 442 get_le16(pb); /* panes */
01f4895c 443 st->codec->bits_per_sample= get_le16(pb); /* depth */
de6d9b64 444 tag1 = get_le32(pb);
b559b29b
MN
445 get_le32(pb); /* ImageSize */
446 get_le32(pb); /* XPelsPerMeter */
447 get_le32(pb); /* YPelsPerMeter */
448 get_le32(pb); /* ClrUsed */
449 get_le32(pb); /* ClrImportant */
450
cbb79c0e
RD
451 if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
452 st->codec->codec_type = CODEC_TYPE_SUBTITLE;
453 st->codec->codec_tag = tag1;
454 st->codec->codec_id = CODEC_ID_XSUB;
455 break;
456 }
457
e344c1ea
SH
458 if(size > 10*4 && size<(1<<30)){
459 st->codec->extradata_size= size - 10*4;
460 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
461 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
462 }
115329f1 463
01f4895c 464 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
952c69c4 465 get_byte(pb);
b559b29b 466
5e29abf8
RT
467 /* Extract palette from extradata if bpp <= 8 */
468 /* This code assumes that extradata contains only palette */
469 /* This is true for all paletted codecs implemented in ffmpeg */
01f4895c
MN
470 if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
471 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
5e29abf8 472#ifdef WORDS_BIGENDIAN
01f4895c
MN
473 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
474 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
5e29abf8 475#else
01f4895c
MN
476 memcpy(st->codec->palctrl->palette, st->codec->extradata,
477 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
5e29abf8 478#endif
01f4895c 479 st->codec->palctrl->palette_changed = 1;
5e29abf8
RT
480 }
481
de6d9b64
FB
482#ifdef DEBUG
483 print_tag("video", tag1, 0);
484#endif
01f4895c
MN
485 st->codec->codec_type = CODEC_TYPE_VIDEO;
486 st->codec->codec_tag = tag1;
487 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
57004ff1 488 st->need_parsing = AVSTREAM_PARSE_HEADERS; // this is needed to get the pict type which is needed for generating correct pts
b559b29b 489// url_fskip(pb, size - 5 * 4);
de6d9b64 490 break;
9bf9a5fc 491 case CODEC_TYPE_AUDIO:
01f4895c 492 get_wav_header(pb, st->codec, size);
78db672c 493 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
143b0820 494 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
78db672c
MN
495 ast->sample_size= st->codec->block_align;
496 }
1cef9527
FR
497 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
498 url_fskip(pb, 1);
5836d158 499 /* Force parsing as several audio frames can be in
a74008a4
JP
500 * one packet and timestamps refer to packet start*/
501 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
cbee7a69
BC
502 /* ADTS header is in extradata, AAC without header must be stored as exact frames, parser not needed and it will fail */
503 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
57004ff1 504 st->need_parsing = AVSTREAM_PARSE_NONE;
8662900b
DB
505 /* AVI files with Xan DPCM audio (wrongly) declare PCM
506 * audio in the header but have Axan as stream_code_tag. */
507 if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){
508 st->codec->codec_id = CODEC_ID_XAN_DPCM;
509 st->codec->codec_tag = 0;
510 }
0b04ebb3
VV
511 if (amv_file_format)
512 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
de6d9b64
FB
513 break;
514 default:
01f4895c
MN
515 st->codec->codec_type = CODEC_TYPE_DATA;
516 st->codec->codec_id= CODEC_ID_NONE;
517 st->codec->codec_tag= 0;
de6d9b64
FB
518 url_fskip(pb, size);
519 break;
520 }
521 }
522 break;
94d1d6c0
MN
523 case MKTAG('i', 'n', 'd', 'x'):
524 i= url_ftell(pb);
2c00106c 525 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
b7b22558 526 read_braindead_odml_indx(s, 0);
b7b22558 527 }
94d1d6c0
MN
528 url_fseek(pb, i+size, SEEK_SET);
529 break;
c86ec2f4
MN
530 case MKTAG('v', 'p', 'r', 'p'):
531 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
532 AVRational active, active_aspect;
533
534 st = s->streams[stream_index];
535 get_le32(pb);
536 get_le32(pb);
537 get_le32(pb);
538 get_le32(pb);
539 get_le32(pb);
540
c86ec2f4 541 active_aspect.den= get_le16(pb);
61559562 542 active_aspect.num= get_le16(pb);
c86ec2f4
MN
543 active.num = get_le32(pb);
544 active.den = get_le32(pb);
545 get_le32(pb); //nbFieldsPerFrame
546
547 if(active_aspect.num && active_aspect.den && active.num && active.den){
548 st->codec->sample_aspect_ratio= av_div_q(active_aspect, active);
549//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
550 }
551 size -= 9*4;
552 }
553 url_fseek(pb, size, SEEK_CUR);
554 break;
57060f89
DC
555 case MKTAG('I', 'N', 'A', 'M'):
556 avi_read_tag(pb, s->title, sizeof(s->title), size);
557 break;
558 case MKTAG('I', 'A', 'R', 'T'):
559 avi_read_tag(pb, s->author, sizeof(s->author), size);
560 break;
561 case MKTAG('I', 'C', 'O', 'P'):
562 avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
563 break;
564 case MKTAG('I', 'C', 'M', 'T'):
565 avi_read_tag(pb, s->comment, sizeof(s->comment), size);
566 break;
567 case MKTAG('I', 'G', 'N', 'R'):
568 avi_read_tag(pb, s->genre, sizeof(s->genre), size);
569 break;
f0861f46
PI
570 case MKTAG('I', 'P', 'R', 'D'):
571 avi_read_tag(pb, s->album, sizeof(s->album), size);
572 break;
2ad4648f
PI
573 case MKTAG('I', 'P', 'R', 'T'):
574 avi_read_tag(pb, str_track, sizeof(str_track), size);
575 sscanf(str_track, "%d", &s->track);
576 break;
de6d9b64 577 default:
755c18ae
MN
578 if(size > 1000000){
579 av_log(s, AV_LOG_ERROR, "well something went wrong during header parsing, "
580 "ill ignore it and try to continue anyway\n");
581 avi->movi_list = url_ftell(pb) - 4;
582 avi->movi_end = url_fsize(pb);
583 goto end_of_header;
584 }
de6d9b64
FB
585 /* skip tag */
586 size += (size & 1);
587 url_fskip(pb, size);
588 break;
589 }
590 }
591 end_of_header:
592 /* check stream number */
593 if (stream_index != s->nb_streams - 1) {
594 fail:
595 for(i=0;i<s->nb_streams;i++) {
01f4895c 596 av_freep(&s->streams[i]->codec->extradata);
9145f8b3 597 av_freep(&s->streams[i]);
de6d9b64
FB
598 }
599 return -1;
600 }
1101abfe 601
b7b22558 602 if(!avi->index_loaded && !url_is_streamed(pb))
94d1d6c0 603 avi_load_index(s);
42feef6b 604 avi->index_loaded = 1;
30a43f2d 605 avi->non_interleaved |= guess_ni_flag(s);
115e8ae5
MN
606 if(avi->non_interleaved)
607 clean_index(s);
115329f1 608
de6d9b64
FB
609 return 0;
610}
611
1101abfe 612static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
de6d9b64
FB
613{
614 AVIContext *avi = s->priv_data;
899681cd 615 ByteIOContext *pb = s->pb;
8f9298f8 616 int n, d[8], size;
4a8d5135 617 offset_t i, sync;
7458ccbb 618 void* dstr;
115329f1 619
a2a6332b 620 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
7458ccbb 621 size = dv_get_packet(avi->dv_demux, pkt);
bb270c08
DB
622 if (size >= 0)
623 return size;
2af7e610 624 }
115329f1 625
7c7f3866 626 if(avi->non_interleaved){
79396ac6 627 int best_stream_index = 0;
7c7f3866
MN
628 AVStream *best_st= NULL;
629 AVIStream *best_ast;
630 int64_t best_ts= INT64_MAX;
631 int i;
115329f1 632
7c7f3866
MN
633 for(i=0; i<s->nb_streams; i++){
634 AVStream *st = s->streams[i];
635 AVIStream *ast = st->priv_data;
636 int64_t ts= ast->frame_offset;
637
638 if(ast->sample_size)
639 ts /= ast->sample_size;
640 ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
641
949b1a13 642// av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
7c7f3866
MN
643 if(ts < best_ts){
644 best_ts= ts;
645 best_st= st;
646 best_stream_index= i;
647 }
648 }
649 best_ast = best_st->priv_data;
650 best_ts= av_rescale(best_ts, best_st->time_base.den, AV_TIME_BASE * (int64_t)best_st->time_base.num); //FIXME a little ugly
651 if(best_ast->remaining)
652 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
653 else
654 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
655
656// av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
657 if(i>=0){
658 int64_t pos= best_st->index_entries[i].pos;
5c89153e 659 pos += best_ast->packet_size - best_ast->remaining;
899681cd 660 url_fseek(s->pb, pos + 8, SEEK_SET);
949b1a13 661// av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
115329f1 662
8223bca5
MN
663 assert(best_ast->remaining <= best_ast->packet_size);
664
1894edeb
MN
665 avi->stream_index= best_stream_index;
666 if(!best_ast->remaining)
8223bca5 667 best_ast->packet_size=
1894edeb 668 best_ast->remaining= best_st->index_entries[i].size;
7c7f3866
MN
669 }
670 }
115329f1 671
4a8d5135 672resync:
7c7f3866
MN
673 if(avi->stream_index >= 0){
674 AVStream *st= s->streams[ avi->stream_index ];
675 AVIStream *ast= st->priv_data;
676 int size;
115329f1 677
e84dab5f 678 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
7c7f3866 679 size= INT_MAX;
115329f1 680 else if(ast->sample_size < 32)
7c7f3866
MN
681 size= 64*ast->sample_size;
682 else
683 size= ast->sample_size;
684
685 if(size > ast->remaining)
686 size= ast->remaining;
2692067a 687 av_get_packet(pb, pkt, size);
115329f1 688
b7c40744
MN
689 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
690 ast->has_pal=0;
691 pkt->size += 4*256;
692 pkt->data = av_realloc(pkt->data, pkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
693 if(pkt->data)
694 memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
695 }
696
a2a6332b 697 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
7c7f3866
MN
698 dstr = pkt->destruct;
699 size = dv_produce_packet(avi->dv_demux, pkt,
700 pkt->data, pkt->size);
701 pkt->destruct = dstr;
702 pkt->flags |= PKT_FLAG_KEY;
703 } else {
704 /* XXX: how to handle B frames in avi ? */
705 pkt->dts = ast->frame_offset;
706// pkt->dts += ast->start;
707 if(ast->sample_size)
708 pkt->dts /= ast->sample_size;
949b1a13 709//av_log(NULL, AV_LOG_DEBUG, "dts:%"PRId64" offset:%"PRId64" %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, avi->stream_index, size);
7c7f3866
MN
710 pkt->stream_index = avi->stream_index;
711
01f4895c 712 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
4323b09d
MN
713 AVIndexEntry *e;
714 int index;
ded3c7da 715 assert(st->index_entries);
7c7f3866 716
4323b09d
MN
717 index= av_index_search_timestamp(st, pkt->dts, 0);
718 e= &st->index_entries[index];
115329f1 719
4323b09d
MN
720 if(index >= 0 && e->timestamp == ast->frame_offset){
721 if (e->flags & AVINDEX_KEYFRAME)
722 pkt->flags |= PKT_FLAG_KEY;
723 }
7c7f3866 724 } else {
115329f1 725 pkt->flags |= PKT_FLAG_KEY;
7c7f3866
MN
726 }
727 if(ast->sample_size)
728 ast->frame_offset += pkt->size;
729 else
730 ast->frame_offset++;
731 }
732 ast->remaining -= size;
733 if(!ast->remaining){
734 avi->stream_index= -1;
735 ast->packet_size= 0;
7c7f3866
MN
736 }
737
738 return size;
739 }
740
4a8d5135
MN
741 memset(d, -1, sizeof(int)*8);
742 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
df99755b 743 int j;
1101abfe 744
df99755b
MN
745 for(j=0; j<7; j++)
746 d[j]= d[j+1];
747 d[7]= get_byte(pb);
115329f1 748
df99755b 749 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
115329f1 750
df99755b 751 if( d[2] >= '0' && d[2] <= '9'
d2c5f0a4
MN
752 && d[3] >= '0' && d[3] <= '9'){
753 n= (d[2] - '0') * 10 + (d[3] - '0');
754 }else{
755 n= 100; //invalid stream id
df99755b 756 }
949b1a13 757//av_log(NULL, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %"PRId64" %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
ea4b2b5e 758 if(i + size > avi->fsize || d[0]<0)
d2c5f0a4 759 continue;
115329f1 760
d2c5f0a4
MN
761 //parse ix##
762 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
bb270c08 763 //parse JUNK
bc3a73bc
MN
764 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
765 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
8f9298f8 766 url_fskip(pb, size);
d2c5f0a4 767//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
4a8d5135 768 goto resync;
8f9298f8 769 }
d2c5f0a4 770
df99755b 771 if( d[0] >= '0' && d[0] <= '9'
d2c5f0a4
MN
772 && d[1] >= '0' && d[1] <= '9'){
773 n= (d[0] - '0') * 10 + (d[1] - '0');
774 }else{
775 n= 100; //invalid stream id
776 }
115329f1 777
d2c5f0a4 778 //parse ##dc/##wb
80e3a08c 779 if(n < s->nb_streams){
d2c5f0a4
MN
780 AVStream *st;
781 AVIStream *ast;
782 st = s->streams[n];
783 ast = st->priv_data;
115329f1 784
41757171 785
79d6b9cb
MN
786 if(s->nb_streams>=2){
787 AVStream *st1 = s->streams[1];
788 AVIStream *ast1= st1->priv_data;
41757171
MN
789 //workaround for broken small-file-bug402.avi
790 if( d[2] == 'w' && d[3] == 'b'
791 && n==0
41757171
MN
792 && st ->codec->codec_type == CODEC_TYPE_VIDEO
793 && st1->codec->codec_type == CODEC_TYPE_AUDIO
794 && ast->prefix == 'd'*256+'c'
795 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
796 ){
797 n=1;
798 st = st1;
799 ast = ast1;
800 av_log(s, AV_LOG_WARNING, "Invalid stream+prefix combination, assuming audio\n");
801 }
79d6b9cb 802 }
41757171
MN
803
804
f3356e9c
MN
805 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
806 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
807 || st->discard >= AVDISCARD_ALL){
808 if(ast->sample_size) ast->frame_offset += pkt->size;
809 else ast->frame_offset++;
b4aea108
MN
810 url_fskip(pb, size);
811 goto resync;
812 }
d2c5f0a4 813
b7c40744
MN
814 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
815 int k = get_byte(pb);
816 int last = (k + get_byte(pb) - 1) & 0xFF;
817
818 get_le16(pb); //flags
819
820 for (; k <= last; k++)
821 ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
822 ast->has_pal= 1;
823 goto resync;
824 } else
115329f1 825 if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
d2c5f0a4 826 d[2]*256+d[3] == ast->prefix /*||
115329f1 827 (d[2] == 'd' && d[3] == 'c') ||
bb270c08 828 (d[2] == 'w' && d[3] == 'b')*/) {
d2c5f0a4
MN
829
830//av_log(NULL, AV_LOG_DEBUG, "OK\n");
831 if(d[2]*256+d[3] == ast->prefix)
832 ast->prefix_count++;
833 else{
834 ast->prefix= d[2]*256+d[3];
835 ast->prefix_count= 0;
836 }
837
7c7f3866
MN
838 avi->stream_index= n;
839 ast->packet_size= size + 8;
840 ast->remaining= size;
ded3c7da
MN
841
842 {
843 uint64_t pos= url_ftell(pb) - 8;
844 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
845 av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
846 }
847 }
7c7f3866 848 goto resync;
d2c5f0a4 849 }
df99755b
MN
850 }
851 }
d2c5f0a4 852
df99755b 853 return -1;
de6d9b64
FB
854}
855
155e9ee9
FB
856/* XXX: we make the implicit supposition that the position are sorted
857 for each stream */
858static int avi_read_idx1(AVFormatContext *s, int size)
859{
7c7f3866 860 AVIContext *avi = s->priv_data;
899681cd 861 ByteIOContext *pb = s->pb;
155e9ee9
FB
862 int nb_index_entries, i;
863 AVStream *st;
864 AVIStream *ast;
155e9ee9 865 unsigned int index, tag, flags, pos, len;
7c7f3866 866 unsigned last_pos= -1;
115329f1 867
155e9ee9
FB
868 nb_index_entries = size / 16;
869 if (nb_index_entries <= 0)
870 return -1;
871
872 /* read the entries and sort them in each stream component */
873 for(i = 0; i < nb_index_entries; i++) {
874 tag = get_le32(pb);
875 flags = get_le32(pb);
876 pos = get_le32(pb);
877 len = get_le32(pb);
52a0bbff 878#if defined(DEBUG_SEEK)
115329f1 879 av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
155e9ee9
FB
880 i, tag, flags, pos, len);
881#endif
7c7f3866
MN
882 if(i==0 && pos > avi->movi_list)
883 avi->movi_list= 0; //FIXME better check
5c89153e 884 pos += avi->movi_list;
7c7f3866 885
155e9ee9
FB
886 index = ((tag & 0xff) - '0') * 10;
887 index += ((tag >> 8) & 0xff) - '0';
888 if (index >= s->nb_streams)
889 continue;
890 st = s->streams[index];
891 ast = st->priv_data;
115329f1 892
52a0bbff 893#if defined(DEBUG_SEEK)
949b1a13 894 av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
52a0bbff 895#endif
80e3a08c
MN
896 if(last_pos == pos)
897 avi->non_interleaved= 1;
898 else
2b70eb2b 899 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
7c7f3866 900 if(ast->sample_size)
2b70eb2b 901 ast->cum_len += len;
7c7f3866
MN
902 else
903 ast->cum_len ++;
7c7f3866 904 last_pos= pos;
155e9ee9
FB
905 }
906 return 0;
907}
908
7c7f3866 909static int guess_ni_flag(AVFormatContext *s){
7c7f3866
MN
910 int i;
911 int64_t last_start=0;
912 int64_t first_end= INT64_MAX;
115329f1 913
7c7f3866
MN
914 for(i=0; i<s->nb_streams; i++){
915 AVStream *st = s->streams[i];
7c7f3866
MN
916 int n= st->nb_index_entries;
917
918 if(n <= 0)
919 continue;
920
921 if(st->index_entries[0].pos > last_start)
922 last_start= st->index_entries[0].pos;
923 if(st->index_entries[n-1].pos < first_end)
924 first_end= st->index_entries[n-1].pos;
925 }
926 return last_start > first_end;
927}
928
155e9ee9
FB
929static int avi_load_index(AVFormatContext *s)
930{
931 AVIContext *avi = s->priv_data;
899681cd 932 ByteIOContext *pb = s->pb;
155e9ee9 933 uint32_t tag, size;
e6c0297f 934 offset_t pos= url_ftell(pb);
115329f1 935
155e9ee9
FB
936 url_fseek(pb, avi->movi_end, SEEK_SET);
937#ifdef DEBUG_SEEK
949b1a13 938 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
155e9ee9
FB
939#endif
940 for(;;) {
941 if (url_feof(pb))
942 break;
943 tag = get_le32(pb);
944 size = get_le32(pb);
945#ifdef DEBUG_SEEK
946 printf("tag=%c%c%c%c size=0x%x\n",
947 tag & 0xff,
948 (tag >> 8) & 0xff,
949 (tag >> 16) & 0xff,
950 (tag >> 24) & 0xff,
951 size);
952#endif
953 switch(tag) {
954 case MKTAG('i', 'd', 'x', '1'):
955 if (avi_read_idx1(s, size) < 0)
956 goto skip;
957 else
958 goto the_end;
959 break;
960 default:
961 skip:
962 size += (size & 1);
963 url_fskip(pb, size);
964 break;
965 }
966 }
967 the_end:
e6c0297f 968 url_fseek(pb, pos, SEEK_SET);
155e9ee9
FB
969 return 0;
970}
971
7b3c1382 972static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
155e9ee9
FB
973{
974 AVIContext *avi = s->priv_data;
975 AVStream *st;
52a0bbff 976 int i, index;
155e9ee9
FB
977 int64_t pos;
978
979 if (!avi->index_loaded) {
980 /* we only load the index on demand */
981 avi_load_index(s);
982 avi->index_loaded = 1;
983 }
52a0bbff 984 assert(stream_index>= 0);
155e9ee9
FB
985
986 st = s->streams[stream_index];
52a0bbff
MN
987 index= av_index_search_timestamp(st, timestamp, flags);
988 if(index<0)
155e9ee9 989 return -1;
115329f1 990
155e9ee9 991 /* find the position */
52a0bbff
MN
992 pos = st->index_entries[index].pos;
993 timestamp = st->index_entries[index].timestamp;
994
949b1a13 995// av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
155e9ee9 996
6eb2de74
RS
997 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
998 /* One and only one real stream for DV in AVI, and it has video */
999 /* offsets. Calling with other stream indices should have failed */
1000 /* the av_index_search_timestamp call above. */
1001 assert(stream_index == 0);
1002
1003 /* Feed the DV video stream version of the timestamp to the */
1004 /* DV demux so it can synth correct timestamps */
1005 dv_offset_reset(avi->dv_demux, timestamp);
1006
899681cd 1007 url_fseek(s->pb, pos, SEEK_SET);
6eb2de74
RS
1008 avi->stream_index= -1;
1009 return 0;
1010 }
1011
155e9ee9 1012 for(i = 0; i < s->nb_streams; i++) {
52a0bbff
MN
1013 AVStream *st2 = s->streams[i];
1014 AVIStream *ast2 = st2->priv_data;
7c7f3866
MN
1015
1016 ast2->packet_size=
1017 ast2->remaining= 0;
1018
52a0bbff
MN
1019 if (st2->nb_index_entries <= 0)
1020 continue;
115329f1 1021
e84dab5f 1022// assert(st2->codec->block_align);
52a0bbff
MN
1023 assert(st2->time_base.den == ast2->rate);
1024 assert(st2->time_base.num == ast2->scale);
1025 index = av_index_search_timestamp(
115329f1 1026 st2,
52a0bbff
MN
1027 av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
1028 flags | AVSEEK_FLAG_BACKWARD);
1029 if(index<0)
1030 index=0;
115329f1 1031
7c7f3866
MN
1032 if(!avi->non_interleaved){
1033 while(index>0 && st2->index_entries[index].pos > pos)
1034 index--;
1035 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1036 index++;
1037 }
1038
949b1a13 1039// av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
52a0bbff
MN
1040 /* extract the current frame number */
1041 ast2->frame_offset = st2->index_entries[index].timestamp;
1042 if(ast2->sample_size)
1043 ast2->frame_offset *=ast2->sample_size;
155e9ee9 1044 }
52a0bbff 1045
155e9ee9 1046 /* do the seek */
899681cd 1047 url_fseek(s->pb, pos, SEEK_SET);
7c7f3866 1048 avi->stream_index= -1;
155e9ee9
FB
1049 return 0;
1050}
1051
1101abfe 1052static int avi_read_close(AVFormatContext *s)
de6d9b64 1053{
5ae2c73e
MN
1054 int i;
1055 AVIContext *avi = s->priv_data;
5ae2c73e
MN
1056
1057 for(i=0;i<s->nb_streams;i++) {
1058 AVStream *st = s->streams[i];
155e9ee9 1059 AVIStream *ast = st->priv_data;
52a0bbff 1060 av_free(ast);
01f4895c 1061 av_free(st->codec->palctrl);
5ae2c73e
MN
1062 }
1063
7458ccbb
RS
1064 if (avi->dv_demux)
1065 av_free(avi->dv_demux);
1066
c9a65ca8
FB
1067 return 0;
1068}
1069
1070static int avi_probe(AVProbeData *p)
1071{
7b31b092
AJ
1072 int i;
1073
c9a65ca8 1074 /* check file header */
7b31b092
AJ
1075 for(i=0; avi_headers[i][0]; i++)
1076 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1077 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1078 return AVPROBE_SCORE_MAX;
1079
1080 return 0;
c9a65ca8
FB
1081}
1082
ff70e601 1083AVInputFormat avi_demuxer = {
c9a65ca8
FB
1084 "avi",
1085 "avi format",
1086 sizeof(AVIContext),
1087 avi_probe,
1088 avi_read_header,
1089 avi_read_packet,
1090 avi_read_close,
155e9ee9 1091 avi_read_seek,
c9a65ca8 1092};