10l (forgot sample_size)
[libav.git] / libavformat / avidec.c
CommitLineData
de6d9b64 1/*
7fbde343 2 * AVI demuxer
15d6e361 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;
bc5c918e 54 int64_t movi_list;
7ccc636f 55 int64_t last_pkt_pos;
155e9ee9 56 int index_loaded;
8f9298f8 57 int is_odml;
7c7f3866
MN
58 int non_interleaved;
59 int stream_index;
ddaae6a9 60 DVDemuxContext* dv_demux;
de6d9b64
FB
61} AVIContext;
62
7b31b092
AJ
63static const char avi_headers[][8] = {
64 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
65 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
66 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
b925ef61 67 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
0b04ebb3 68 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
7b31b092
AJ
69 { 0 }
70};
71
42feef6b 72static int avi_load_index(AVFormatContext *s);
30a43f2d 73static int guess_ni_flag(AVFormatContext *s);
42feef6b 74
de6d9b64 75#ifdef DEBUG
1101abfe 76static void print_tag(const char *str, unsigned int tag, int size)
de6d9b64
FB
77{
78 printf("%s: tag=%c%c%c%c size=0x%x\n",
79 str, tag & 0xff,
80 (tag >> 8) & 0xff,
81 (tag >> 16) & 0xff,
82 (tag >> 24) & 0xff,
83 size);
84}
85#endif
86
06219cb1
RS
87static int get_riff(AVIContext *avi, ByteIOContext *pb)
88{
7b31b092
AJ
89 char header[8];
90 int i;
06219cb1 91
7b31b092
AJ
92 /* check RIFF header */
93 get_buffer(pb, header, 4);
06219cb1
RS
94 avi->riff_end = get_le32(pb); /* RIFF chunk size */
95 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
7b31b092
AJ
96 get_buffer(pb, header+4, 4);
97
98 for(i=0; avi_headers[i][0]; i++)
99 if(!memcmp(header, avi_headers[i], 8))
100 break;
101 if(!avi_headers[i][0])
06219cb1 102 return -1;
115329f1 103
7b31b092 104 if(header[7] == 0x19)
15d6e361 105 av_log(NULL, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
7b31b092 106
06219cb1
RS
107 return 0;
108}
109
94d1d6c0 110static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
8945ebb9 111 AVIContext *avi = s->priv_data;
899681cd 112 ByteIOContext *pb = s->pb;
94d1d6c0
MN
113 int longs_pre_entry= get_le16(pb);
114 int index_sub_type = get_byte(pb);
115 int index_type = get_byte(pb);
116 int entries_in_use = get_le32(pb);
117 int chunk_id = get_le32(pb);
118 int64_t base = get_le64(pb);
119 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
120 AVStream *st;
121 AVIStream *ast;
122 int i;
8945ebb9 123 int64_t last_pos= -1;
899681cd 124 int64_t filesize= url_fsize(s->pb);
94d1d6c0 125
965a63af 126#ifdef DEBUG_SEEK
949b1a13 127 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
128 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
129#endif
94d1d6c0
MN
130
131 if(stream_id > s->nb_streams || stream_id < 0)
132 return -1;
133 st= s->streams[stream_id];
134 ast = st->priv_data;
135
136 if(index_sub_type)
137 return -1;
138
139 get_le32(pb);
140
141 if(index_type && longs_pre_entry != 2)
142 return -1;
143 if(index_type>1)
144 return -1;
145
965a63af
MN
146 if(filesize > 0 && base >= filesize){
147 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
148 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
149 base &= 0xFFFFFFFF;
150 else
151 return -1;
152 }
153
94d1d6c0
MN
154 for(i=0; i<entries_in_use; i++){
155 if(index_type){
30a43f2d 156 int64_t pos= get_le32(pb) + base - 8;
94d1d6c0 157 int len = get_le32(pb);
30a43f2d 158 int key= len >= 0;
94d1d6c0
MN
159 len &= 0x7FFFFFFF;
160
965a63af 161#ifdef DEBUG_SEEK
949b1a13 162 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
965a63af 163#endif
8945ebb9
MN
164 if(last_pos == pos || pos == base - 8)
165 avi->non_interleaved= 1;
166 else
2b70eb2b 167 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
30a43f2d 168
94d1d6c0 169 if(ast->sample_size)
2b70eb2b 170 ast->cum_len += len;
94d1d6c0
MN
171 else
172 ast->cum_len ++;
8945ebb9 173 last_pos= pos;
94d1d6c0 174 }else{
26b89135
MR
175 int64_t offset, pos;
176 int duration;
177 offset = get_le64(pb);
178 get_le32(pb); /* size */
179 duration = get_le32(pb);
180 pos = url_ftell(pb);
94d1d6c0
MN
181
182 url_fseek(pb, offset+8, SEEK_SET);
183 read_braindead_odml_indx(s, frame_num);
184 frame_num += duration;
185
186 url_fseek(pb, pos, SEEK_SET);
187 }
188 }
965a63af 189 avi->index_loaded=1;
94d1d6c0
MN
190 return 0;
191}
192
115e8ae5 193static void clean_index(AVFormatContext *s){
965a63af
MN
194 int i;
195 int64_t j;
115e8ae5
MN
196
197 for(i=0; i<s->nb_streams; i++){
198 AVStream *st = s->streams[i];
199 AVIStream *ast = st->priv_data;
200 int n= st->nb_index_entries;
201 int max= ast->sample_size;
202 int64_t pos, size, ts;
203
204 if(n != 1 || ast->sample_size==0)
205 continue;
206
207 while(max < 1024) max+=max;
208
209 pos= st->index_entries[0].pos;
210 size= st->index_entries[0].size;
211 ts= st->index_entries[0].timestamp;
212
213 for(j=0; j<size; j+=max){
214 av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
215 }
216 }
217}
218
57060f89
DC
219static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen, unsigned int size)
220{
bc5c918e 221 int64_t i = url_ftell(pb);
57060f89
DC
222 size += (size & 1);
223 get_strz(pb, buf, maxlen);
224 url_fseek(pb, i+size, SEEK_SET);
225 return 0;
226}
227
1101abfe 228static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
de6d9b64 229{
c9a65ca8 230 AVIContext *avi = s->priv_data;
899681cd 231 ByteIOContext *pb = s->pb;
deb0a292 232 uint32_t tag, tag1, handler;
b53f1064 233 int codec_type, stream_index, frame_period, bit_rate;
247eadca 234 unsigned int size, nb_frames;
6d29fba9 235 int i;
de6d9b64 236 AVStream *st;
26b89135 237 AVIStream *ast = NULL;
2ad4648f 238 char str_track[4];
0b04ebb3
VV
239 int avih_width=0, avih_height=0;
240 int amv_file_format=0;
de6d9b64 241
7c7f3866 242 avi->stream_index= -1;
115329f1 243
06219cb1 244 if (get_riff(avi, pb) < 0)
de6d9b64 245 return -1;
1101abfe 246
ea4b2b5e
MN
247 avi->fsize = url_fsize(pb);
248 if(avi->fsize<=0)
249 avi->fsize= avi->riff_end;
250
de6d9b64
FB
251 /* first list tag */
252 stream_index = -1;
253 codec_type = -1;
254 frame_period = 0;
255 for(;;) {
256 if (url_feof(pb))
257 goto fail;
258 tag = get_le32(pb);
259 size = get_le32(pb);
260#ifdef DEBUG
261 print_tag("tag", tag, size);
262#endif
263
264 switch(tag) {
265 case MKTAG('L', 'I', 'S', 'T'):
15d6e361 266 /* Ignored, except at start of video packets. */
de6d9b64
FB
267 tag1 = get_le32(pb);
268#ifdef DEBUG
269 print_tag("list", tag1, 0);
270#endif
271 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
155e9ee9 272 avi->movi_list = url_ftell(pb) - 4;
2064c77a 273 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
a965c478 274 else avi->movi_end = url_fsize(pb);
de6d9b64 275#ifdef DEBUG
949b1a13 276 printf("movi end=%"PRIx64"\n", avi->movi_end);
de6d9b64
FB
277#endif
278 goto end_of_header;
279 }
280 break;
8f9298f8 281 case MKTAG('d', 'm', 'l', 'h'):
bb270c08
DB
282 avi->is_odml = 1;
283 url_fskip(pb, size + (size & 1));
284 break;
0b04ebb3
VV
285 case MKTAG('a', 'm', 'v', 'h'):
286 amv_file_format=1;
de6d9b64 287 case MKTAG('a', 'v', 'i', 'h'):
15d6e361 288 /* AVI header */
1101abfe 289 /* using frame_period is bad idea */
de6d9b64
FB
290 frame_period = get_le32(pb);
291 bit_rate = get_le32(pb) * 8;
1894edeb
MN
292 get_le32(pb);
293 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
294
295 url_fskip(pb, 2 * 4);
6d29fba9 296 get_le32(pb);
0b04ebb3
VV
297 get_le32(pb);
298 avih_width=get_le32(pb);
299 avih_height=get_le32(pb);
6d29fba9 300
0b04ebb3 301 url_fskip(pb, size - 10 * 4);
6d29fba9
MN
302 break;
303 case MKTAG('s', 't', 'r', 'h'):
304 /* stream header */
305
306 tag1 = get_le32(pb);
307 handler = get_le32(pb); /* codec tag */
308
309 if(tag1 == MKTAG('p', 'a', 'd', 's')){
310 url_fskip(pb, size - 8);
311 break;
312 }else{
313 stream_index++;
314 st = av_new_stream(s, stream_index);
de6d9b64
FB
315 if (!st)
316 goto fail;
9ee91c2f 317
155e9ee9
FB
318 ast = av_mallocz(sizeof(AVIStream));
319 if (!ast)
320 goto fail;
321 st->priv_data = ast;
bb270c08 322 }
0b04ebb3
VV
323 if(amv_file_format)
324 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
6d29fba9 325
cc11e2b3 326#ifdef DEBUG
e344c1ea 327 print_tag("strh", tag1, -1);
cc11e2b3 328#endif
b53f1064 329 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
6eb2de74
RS
330 int64_t dv_dur;
331
115329f1 332 /*
bb270c08 333 * After some consideration -- I don't think we
15d6e361 334 * have to support anything but DV in type1 AVIs.
bb270c08
DB
335 */
336 if (s->nb_streams != 1)
337 goto fail;
338
339 if (handler != MKTAG('d', 'v', 's', 'd') &&
340 handler != MKTAG('d', 'v', 'h', 'd') &&
341 handler != MKTAG('d', 'v', 's', 'l'))
342 goto fail;
343
344 ast = s->streams[0]->priv_data;
345 av_freep(&s->streams[0]->codec->extradata);
346 av_freep(&s->streams[0]);
347 s->nb_streams = 0;
a2a6332b 348 if (ENABLE_DV_DEMUXER) {
38ca53da
AJ
349 avi->dv_demux = dv_init_demux(s);
350 if (!avi->dv_demux)
351 goto fail;
a2a6332b 352 }
bb270c08
DB
353 s->streams[0]->priv_data = ast;
354 url_fskip(pb, 3 * 4);
355 ast->scale = get_le32(pb);
356 ast->rate = get_le32(pb);
6eb2de74
RS
357 url_fskip(pb, 4); /* start time */
358
359 dv_dur = get_le32(pb);
360 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
361 dv_dur *= AV_TIME_BASE;
362 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
363 }
364 /*
365 * else, leave duration alone; timing estimation in utils.c
15d6e361 366 * will make a guess based on bitrate.
6eb2de74
RS
367 */
368
bb270c08 369 stream_index = s->nb_streams - 1;
6eb2de74 370 url_fskip(pb, size - 9*4);
b53f1064
MN
371 break;
372 }
b559b29b 373
6d29fba9 374 assert(stream_index < s->nb_streams);
01f4895c 375 st->codec->stream_codec_tag= handler;
b559b29b 376
b53f1064
MN
377 get_le32(pb); /* flags */
378 get_le16(pb); /* priority */
379 get_le16(pb); /* language */
380 get_le32(pb); /* initial frame */
381 ast->scale = get_le32(pb);
382 ast->rate = get_le32(pb);
4a030a1f 383 if(!(ast->scale && ast->rate)){
15d6e361 384 av_log(s, AV_LOG_WARNING, "scale/rate is %u/%u which is invalid. (This file has been generated by broken software.)\n", ast->scale, ast->rate);
0dbb6515
MN
385 if(frame_period){
386 ast->rate = 1000000;
387 ast->scale = frame_period;
388 }else{
389 ast->rate = 25;
390 ast->scale = 1;
391 }
4a030a1f 392 }
b53f1064 393 av_set_pts_info(st, 64, ast->scale, ast->rate);
115329f1 394
b72a2bc8 395 ast->cum_len=get_le32(pb); /* start */
b53f1064 396 nb_frames = get_le32(pb);
b559b29b 397
b53f1064 398 st->start_time = 0;
c0df9d75 399 st->duration = nb_frames;
b53f1064
MN
400 get_le32(pb); /* buffer size */
401 get_le32(pb); /* quality */
402 ast->sample_size = get_le32(pb); /* sample ssize */
2b70eb2b 403 ast->cum_len *= FFMAX(1, ast->sample_size);
b53f1064 404// av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
247eadca 405
b53f1064 406 switch(tag1) {
bb270c08 407 case MKTAG('v', 'i', 'd', 's'):
b53f1064 408 codec_type = CODEC_TYPE_VIDEO;
247eadca 409
b53f1064 410 ast->sample_size = 0;
b53f1064
MN
411 break;
412 case MKTAG('a', 'u', 'd', 's'):
413 codec_type = CODEC_TYPE_AUDIO;
9bf9a5fc 414 break;
cc11e2b3 415 case MKTAG('t', 'x', 't', 's'):
115329f1 416 //FIXME
cc11e2b3 417 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
cc11e2b3 418 break;
25176d6e
FE
419 case MKTAG('d', 'a', 't', 's'):
420 codec_type = CODEC_TYPE_DATA;
421 break;
9bf9a5fc 422 default:
30667f42 423 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
9bf9a5fc 424 goto fail;
de6d9b64 425 }
2b70eb2b 426 ast->frame_offset= ast->cum_len;
b53f1064 427 url_fskip(pb, size - 12 * 4);
de6d9b64
FB
428 break;
429 case MKTAG('s', 't', 'r', 'f'):
430 /* stream header */
6d29fba9 431 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
de6d9b64
FB
432 url_fskip(pb, size);
433 } else {
434 st = s->streams[stream_index];
435 switch(codec_type) {
436 case CODEC_TYPE_VIDEO:
0b04ebb3
VV
437 if(amv_file_format){
438 st->codec->width=avih_width;
439 st->codec->height=avih_height;
440 st->codec->codec_type = CODEC_TYPE_VIDEO;
441 st->codec->codec_id = CODEC_ID_AMV;
442 url_fskip(pb, size);
443 break;
444 }
de6d9b64 445 get_le32(pb); /* size */
01f4895c
MN
446 st->codec->width = get_le32(pb);
447 st->codec->height = get_le32(pb);
de6d9b64 448 get_le16(pb); /* panes */
dd1c8f3e 449 st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
de6d9b64 450 tag1 = get_le32(pb);
b559b29b
MN
451 get_le32(pb); /* ImageSize */
452 get_le32(pb); /* XPelsPerMeter */
453 get_le32(pb); /* YPelsPerMeter */
454 get_le32(pb); /* ClrUsed */
455 get_le32(pb); /* ClrImportant */
456
cbb79c0e
RD
457 if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
458 st->codec->codec_type = CODEC_TYPE_SUBTITLE;
459 st->codec->codec_tag = tag1;
460 st->codec->codec_id = CODEC_ID_XSUB;
461 break;
462 }
463
e344c1ea
SH
464 if(size > 10*4 && size<(1<<30)){
465 st->codec->extradata_size= size - 10*4;
466 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
467 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
468 }
115329f1 469
01f4895c 470 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
952c69c4 471 get_byte(pb);
b559b29b 472
15d6e361
DB
473 /* Extract palette from extradata if bpp <= 8. */
474 /* This code assumes that extradata contains only palette. */
475 /* This is true for all paletted codecs implemented in FFmpeg. */
dd1c8f3e 476 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
01f4895c 477 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
5e29abf8 478#ifdef WORDS_BIGENDIAN
01f4895c
MN
479 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
480 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
5e29abf8 481#else
01f4895c
MN
482 memcpy(st->codec->palctrl->palette, st->codec->extradata,
483 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
5e29abf8 484#endif
01f4895c 485 st->codec->palctrl->palette_changed = 1;
5e29abf8
RT
486 }
487
de6d9b64
FB
488#ifdef DEBUG
489 print_tag("video", tag1, 0);
490#endif
01f4895c
MN
491 st->codec->codec_type = CODEC_TYPE_VIDEO;
492 st->codec->codec_tag = tag1;
493 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
15d6e361 494 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
b559b29b 495// url_fskip(pb, size - 5 * 4);
de6d9b64 496 break;
9bf9a5fc 497 case CODEC_TYPE_AUDIO:
01f4895c 498 get_wav_header(pb, st->codec, size);
78db672c 499 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
143b0820 500 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
78db672c
MN
501 ast->sample_size= st->codec->block_align;
502 }
1cef9527
FR
503 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
504 url_fskip(pb, 1);
5836d158 505 /* Force parsing as several audio frames can be in
15d6e361 506 * one packet and timestamps refer to packet start. */
a74008a4 507 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
15d6e361
DB
508 /* ADTS header is in extradata, AAC without header must be
509 * stored as exact frames. Parser not needed and it will
510 * fail. */
cbee7a69 511 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
57004ff1 512 st->need_parsing = AVSTREAM_PARSE_NONE;
8662900b
DB
513 /* AVI files with Xan DPCM audio (wrongly) declare PCM
514 * audio in the header but have Axan as stream_code_tag. */
515 if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){
516 st->codec->codec_id = CODEC_ID_XAN_DPCM;
517 st->codec->codec_tag = 0;
518 }
0b04ebb3
VV
519 if (amv_file_format)
520 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
de6d9b64
FB
521 break;
522 default:
01f4895c
MN
523 st->codec->codec_type = CODEC_TYPE_DATA;
524 st->codec->codec_id= CODEC_ID_NONE;
525 st->codec->codec_tag= 0;
de6d9b64
FB
526 url_fskip(pb, size);
527 break;
528 }
529 }
530 break;
94d1d6c0
MN
531 case MKTAG('i', 'n', 'd', 'x'):
532 i= url_ftell(pb);
2c00106c 533 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
b7b22558 534 read_braindead_odml_indx(s, 0);
b7b22558 535 }
94d1d6c0
MN
536 url_fseek(pb, i+size, SEEK_SET);
537 break;
c86ec2f4
MN
538 case MKTAG('v', 'p', 'r', 'p'):
539 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
540 AVRational active, active_aspect;
541
542 st = s->streams[stream_index];
543 get_le32(pb);
544 get_le32(pb);
545 get_le32(pb);
546 get_le32(pb);
547 get_le32(pb);
548
c86ec2f4 549 active_aspect.den= get_le16(pb);
61559562 550 active_aspect.num= get_le16(pb);
c86ec2f4
MN
551 active.num = get_le32(pb);
552 active.den = get_le32(pb);
553 get_le32(pb); //nbFieldsPerFrame
554
555 if(active_aspect.num && active_aspect.den && active.num && active.den){
59729451 556 st->sample_aspect_ratio= av_div_q(active_aspect, active);
c86ec2f4
MN
557//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
558 }
559 size -= 9*4;
560 }
561 url_fseek(pb, size, SEEK_CUR);
562 break;
57060f89
DC
563 case MKTAG('I', 'N', 'A', 'M'):
564 avi_read_tag(pb, s->title, sizeof(s->title), size);
565 break;
566 case MKTAG('I', 'A', 'R', 'T'):
567 avi_read_tag(pb, s->author, sizeof(s->author), size);
568 break;
569 case MKTAG('I', 'C', 'O', 'P'):
570 avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
571 break;
572 case MKTAG('I', 'C', 'M', 'T'):
573 avi_read_tag(pb, s->comment, sizeof(s->comment), size);
574 break;
575 case MKTAG('I', 'G', 'N', 'R'):
576 avi_read_tag(pb, s->genre, sizeof(s->genre), size);
577 break;
f0861f46
PI
578 case MKTAG('I', 'P', 'R', 'D'):
579 avi_read_tag(pb, s->album, sizeof(s->album), size);
580 break;
2ad4648f
PI
581 case MKTAG('I', 'P', 'R', 'T'):
582 avi_read_tag(pb, str_track, sizeof(str_track), size);
583 sscanf(str_track, "%d", &s->track);
584 break;
de6d9b64 585 default:
755c18ae 586 if(size > 1000000){
15d6e361
DB
587 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
588 "I will ignore it and try to continue anyway.\n");
755c18ae
MN
589 avi->movi_list = url_ftell(pb) - 4;
590 avi->movi_end = url_fsize(pb);
591 goto end_of_header;
592 }
de6d9b64
FB
593 /* skip tag */
594 size += (size & 1);
595 url_fskip(pb, size);
596 break;
597 }
598 }
599 end_of_header:
600 /* check stream number */
601 if (stream_index != s->nb_streams - 1) {
602 fail:
de6d9b64
FB
603 return -1;
604 }
1101abfe 605
b7b22558 606 if(!avi->index_loaded && !url_is_streamed(pb))
94d1d6c0 607 avi_load_index(s);
42feef6b 608 avi->index_loaded = 1;
30a43f2d 609 avi->non_interleaved |= guess_ni_flag(s);
9d4cd3bf 610 if(avi->non_interleaved) {
15d6e361 611 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
115e8ae5 612 clean_index(s);
9d4cd3bf 613 }
115329f1 614
de6d9b64
FB
615 return 0;
616}
617
f080a7bd
MN
618static int get_stream_idx(int *d){
619 if( d[0] >= '0' && d[0] <= '9'
620 && d[1] >= '0' && d[1] <= '9'){
621 return (d[0] - '0') * 10 + (d[1] - '0');
622 }else{
623 return 100; //invalid stream ID
624 }
625}
626
1101abfe 627static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
de6d9b64
FB
628{
629 AVIContext *avi = s->priv_data;
899681cd 630 ByteIOContext *pb = s->pb;
8f9298f8 631 int n, d[8], size;
bc5c918e 632 int64_t i, sync;
7458ccbb 633 void* dstr;
115329f1 634
a2a6332b 635 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
7458ccbb 636 size = dv_get_packet(avi->dv_demux, pkt);
bb270c08
DB
637 if (size >= 0)
638 return size;
2af7e610 639 }
115329f1 640
7c7f3866 641 if(avi->non_interleaved){
79396ac6 642 int best_stream_index = 0;
7c7f3866
MN
643 AVStream *best_st= NULL;
644 AVIStream *best_ast;
645 int64_t best_ts= INT64_MAX;
646 int i;
115329f1 647
7c7f3866
MN
648 for(i=0; i<s->nb_streams; i++){
649 AVStream *st = s->streams[i];
650 AVIStream *ast = st->priv_data;
651 int64_t ts= ast->frame_offset;
652
653 if(ast->sample_size)
654 ts /= ast->sample_size;
655 ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
656
949b1a13 657// av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
2be83b96 658 if(ts < best_ts && st->nb_index_entries){
7c7f3866
MN
659 best_ts= ts;
660 best_st= st;
661 best_stream_index= i;
662 }
663 }
fce88d52
MN
664 if(!best_st)
665 return -1;
666
7c7f3866
MN
667 best_ast = best_st->priv_data;
668 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
669 if(best_ast->remaining)
670 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
25983dcd 671 else{
7c7f3866 672 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
25983dcd 673 if(i>=0)
a3bb564e
MN
674 best_ast->frame_offset= best_st->index_entries[i].timestamp
675 * FFMAX(1, best_ast->sample_size);
25983dcd 676 }
7c7f3866
MN
677
678// av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
679 if(i>=0){
680 int64_t pos= best_st->index_entries[i].pos;
5c89153e 681 pos += best_ast->packet_size - best_ast->remaining;
899681cd 682 url_fseek(s->pb, pos + 8, SEEK_SET);
949b1a13 683// av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
115329f1 684
8223bca5
MN
685 assert(best_ast->remaining <= best_ast->packet_size);
686
1894edeb
MN
687 avi->stream_index= best_stream_index;
688 if(!best_ast->remaining)
8223bca5 689 best_ast->packet_size=
1894edeb 690 best_ast->remaining= best_st->index_entries[i].size;
7c7f3866
MN
691 }
692 }
115329f1 693
4a8d5135 694resync:
7c7f3866
MN
695 if(avi->stream_index >= 0){
696 AVStream *st= s->streams[ avi->stream_index ];
697 AVIStream *ast= st->priv_data;
698 int size;
115329f1 699
e84dab5f 700 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
7c7f3866 701 size= INT_MAX;
115329f1 702 else if(ast->sample_size < 32)
7c7f3866
MN
703 size= 64*ast->sample_size;
704 else
705 size= ast->sample_size;
706
707 if(size > ast->remaining)
708 size= ast->remaining;
7ccc636f 709 avi->last_pkt_pos= url_ftell(pb);
2692067a 710 av_get_packet(pb, pkt, size);
115329f1 711
b7c40744
MN
712 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
713 ast->has_pal=0;
714 pkt->size += 4*256;
715 pkt->data = av_realloc(pkt->data, pkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
716 if(pkt->data)
717 memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
718 }
719
a2a6332b 720 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
7c7f3866
MN
721 dstr = pkt->destruct;
722 size = dv_produce_packet(avi->dv_demux, pkt,
723 pkt->data, pkt->size);
724 pkt->destruct = dstr;
725 pkt->flags |= PKT_FLAG_KEY;
726 } else {
15d6e361 727 /* XXX: How to handle B-frames in AVI? */
7c7f3866
MN
728 pkt->dts = ast->frame_offset;
729// pkt->dts += ast->start;
730 if(ast->sample_size)
731 pkt->dts /= ast->sample_size;
949b1a13 732//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
733 pkt->stream_index = avi->stream_index;
734
01f4895c 735 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
4323b09d
MN
736 AVIndexEntry *e;
737 int index;
ded3c7da 738 assert(st->index_entries);
7c7f3866 739
4323b09d
MN
740 index= av_index_search_timestamp(st, pkt->dts, 0);
741 e= &st->index_entries[index];
115329f1 742
4323b09d
MN
743 if(index >= 0 && e->timestamp == ast->frame_offset){
744 if (e->flags & AVINDEX_KEYFRAME)
745 pkt->flags |= PKT_FLAG_KEY;
746 }
7c7f3866 747 } else {
115329f1 748 pkt->flags |= PKT_FLAG_KEY;
7c7f3866
MN
749 }
750 if(ast->sample_size)
751 ast->frame_offset += pkt->size;
752 else
753 ast->frame_offset++;
754 }
755 ast->remaining -= size;
756 if(!ast->remaining){
757 avi->stream_index= -1;
758 ast->packet_size= 0;
7c7f3866
MN
759 }
760
761 return size;
762 }
763
4a8d5135
MN
764 memset(d, -1, sizeof(int)*8);
765 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
df99755b 766 int j;
1101abfe 767
df99755b
MN
768 for(j=0; j<7; j++)
769 d[j]= d[j+1];
770 d[7]= get_byte(pb);
115329f1 771
df99755b 772 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
115329f1 773
f080a7bd 774 n= get_stream_idx(d+2);
949b1a13 775//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 776 if(i + size > avi->fsize || d[0]<0)
d2c5f0a4 777 continue;
115329f1 778
d2c5f0a4
MN
779 //parse ix##
780 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
bb270c08 781 //parse JUNK
bc3a73bc
MN
782 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
783 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
8f9298f8 784 url_fskip(pb, size);
d2c5f0a4 785//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
4a8d5135 786 goto resync;
8f9298f8 787 }
d2c5f0a4 788
f080a7bd 789 n= get_stream_idx(d);
115329f1 790
7ccc636f
MN
791 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
792 continue;
793
d2c5f0a4 794 //parse ##dc/##wb
80e3a08c 795 if(n < s->nb_streams){
1ce50d32
MN
796 AVStream *st;
797 AVIStream *ast;
798 st = s->streams[n];
799 ast = st->priv_data;
41757171 800
79d6b9cb
MN
801 if(s->nb_streams>=2){
802 AVStream *st1 = s->streams[1];
803 AVIStream *ast1= st1->priv_data;
1ce50d32
MN
804 //workaround for broken small-file-bug402.avi
805 if( d[2] == 'w' && d[3] == 'b'
806 && n==0
807 && st ->codec->codec_type == CODEC_TYPE_VIDEO
808 && st1->codec->codec_type == CODEC_TYPE_AUDIO
809 && ast->prefix == 'd'*256+'c'
810 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
811 ){
812 n=1;
813 st = st1;
814 ast = ast1;
15d6e361 815 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
1ce50d32 816 }
79d6b9cb 817 }
41757171
MN
818
819
1ce50d32
MN
820 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
821 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
822 || st->discard >= AVDISCARD_ALL){
f3356e9c
MN
823 if(ast->sample_size) ast->frame_offset += pkt->size;
824 else ast->frame_offset++;
b4aea108
MN
825 url_fskip(pb, size);
826 goto resync;
1ce50d32 827 }
d2c5f0a4 828
1ce50d32 829 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
b7c40744
MN
830 int k = get_byte(pb);
831 int last = (k + get_byte(pb) - 1) & 0xFF;
832
833 get_le16(pb); //flags
834
835 for (; k <= last; k++)
836 ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
837 ast->has_pal= 1;
838 goto resync;
1ce50d32
MN
839 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
840 d[2]*256+d[3] == ast->prefix /*||
841 (d[2] == 'd' && d[3] == 'c') ||
842 (d[2] == 'w' && d[3] == 'b')*/) {
d2c5f0a4
MN
843
844//av_log(NULL, AV_LOG_DEBUG, "OK\n");
1ce50d32
MN
845 if(d[2]*256+d[3] == ast->prefix)
846 ast->prefix_count++;
847 else{
848 ast->prefix= d[2]*256+d[3];
849 ast->prefix_count= 0;
850 }
d2c5f0a4 851
1ce50d32
MN
852 avi->stream_index= n;
853 ast->packet_size= size + 8;
854 ast->remaining= size;
ded3c7da 855
1ce50d32
MN
856 {
857 uint64_t pos= url_ftell(pb) - 8;
858 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
859 av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
860 }
ded3c7da 861 }
1ce50d32 862 goto resync;
ded3c7da 863 }
df99755b
MN
864 }
865 }
d2c5f0a4 866
df99755b 867 return -1;
de6d9b64
FB
868}
869
15d6e361
DB
870/* XXX: We make the implicit supposition that the positions are sorted
871 for each stream. */
155e9ee9
FB
872static int avi_read_idx1(AVFormatContext *s, int size)
873{
7c7f3866 874 AVIContext *avi = s->priv_data;
899681cd 875 ByteIOContext *pb = s->pb;
155e9ee9
FB
876 int nb_index_entries, i;
877 AVStream *st;
878 AVIStream *ast;
155e9ee9 879 unsigned int index, tag, flags, pos, len;
7c7f3866 880 unsigned last_pos= -1;
115329f1 881
155e9ee9
FB
882 nb_index_entries = size / 16;
883 if (nb_index_entries <= 0)
884 return -1;
885
15d6e361 886 /* Read the entries and sort them in each stream component. */
155e9ee9
FB
887 for(i = 0; i < nb_index_entries; i++) {
888 tag = get_le32(pb);
889 flags = get_le32(pb);
890 pos = get_le32(pb);
891 len = get_le32(pb);
52a0bbff 892#if defined(DEBUG_SEEK)
115329f1 893 av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
155e9ee9
FB
894 i, tag, flags, pos, len);
895#endif
7c7f3866
MN
896 if(i==0 && pos > avi->movi_list)
897 avi->movi_list= 0; //FIXME better check
5c89153e 898 pos += avi->movi_list;
7c7f3866 899
155e9ee9
FB
900 index = ((tag & 0xff) - '0') * 10;
901 index += ((tag >> 8) & 0xff) - '0';
902 if (index >= s->nb_streams)
903 continue;
904 st = s->streams[index];
905 ast = st->priv_data;
115329f1 906
52a0bbff 907#if defined(DEBUG_SEEK)
949b1a13 908 av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
52a0bbff 909#endif
80e3a08c
MN
910 if(last_pos == pos)
911 avi->non_interleaved= 1;
912 else
2b70eb2b 913 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
7c7f3866 914 if(ast->sample_size)
2b70eb2b 915 ast->cum_len += len;
7c7f3866
MN
916 else
917 ast->cum_len ++;
7c7f3866 918 last_pos= pos;
155e9ee9
FB
919 }
920 return 0;
921}
922
7c7f3866 923static int guess_ni_flag(AVFormatContext *s){
7c7f3866
MN
924 int i;
925 int64_t last_start=0;
926 int64_t first_end= INT64_MAX;
115329f1 927
7c7f3866
MN
928 for(i=0; i<s->nb_streams; i++){
929 AVStream *st = s->streams[i];
7c7f3866
MN
930 int n= st->nb_index_entries;
931
932 if(n <= 0)
933 continue;
934
935 if(st->index_entries[0].pos > last_start)
936 last_start= st->index_entries[0].pos;
937 if(st->index_entries[n-1].pos < first_end)
938 first_end= st->index_entries[n-1].pos;
939 }
940 return last_start > first_end;
941}
942
155e9ee9
FB
943static int avi_load_index(AVFormatContext *s)
944{
945 AVIContext *avi = s->priv_data;
899681cd 946 ByteIOContext *pb = s->pb;
155e9ee9 947 uint32_t tag, size;
bc5c918e 948 int64_t pos= url_ftell(pb);
115329f1 949
155e9ee9
FB
950 url_fseek(pb, avi->movi_end, SEEK_SET);
951#ifdef DEBUG_SEEK
949b1a13 952 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
155e9ee9
FB
953#endif
954 for(;;) {
955 if (url_feof(pb))
956 break;
957 tag = get_le32(pb);
958 size = get_le32(pb);
959#ifdef DEBUG_SEEK
960 printf("tag=%c%c%c%c size=0x%x\n",
961 tag & 0xff,
962 (tag >> 8) & 0xff,
963 (tag >> 16) & 0xff,
964 (tag >> 24) & 0xff,
965 size);
966#endif
967 switch(tag) {
968 case MKTAG('i', 'd', 'x', '1'):
969 if (avi_read_idx1(s, size) < 0)
970 goto skip;
971 else
972 goto the_end;
973 break;
974 default:
975 skip:
976 size += (size & 1);
977 url_fskip(pb, size);
978 break;
979 }
980 }
981 the_end:
e6c0297f 982 url_fseek(pb, pos, SEEK_SET);
155e9ee9
FB
983 return 0;
984}
985
7b3c1382 986static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
155e9ee9
FB
987{
988 AVIContext *avi = s->priv_data;
989 AVStream *st;
52a0bbff 990 int i, index;
155e9ee9
FB
991 int64_t pos;
992
993 if (!avi->index_loaded) {
994 /* we only load the index on demand */
995 avi_load_index(s);
996 avi->index_loaded = 1;
997 }
52a0bbff 998 assert(stream_index>= 0);
155e9ee9
FB
999
1000 st = s->streams[stream_index];
52a0bbff
MN
1001 index= av_index_search_timestamp(st, timestamp, flags);
1002 if(index<0)
155e9ee9 1003 return -1;
115329f1 1004
155e9ee9 1005 /* find the position */
52a0bbff
MN
1006 pos = st->index_entries[index].pos;
1007 timestamp = st->index_entries[index].timestamp;
1008
949b1a13 1009// av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
155e9ee9 1010
6eb2de74
RS
1011 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
1012 /* One and only one real stream for DV in AVI, and it has video */
f4433de9 1013 /* offsets. Calling with other stream indexes should have failed */
6eb2de74
RS
1014 /* the av_index_search_timestamp call above. */
1015 assert(stream_index == 0);
1016
1017 /* Feed the DV video stream version of the timestamp to the */
15d6e361 1018 /* DV demux so it can synthesize correct timestamps. */
6eb2de74
RS
1019 dv_offset_reset(avi->dv_demux, timestamp);
1020
899681cd 1021 url_fseek(s->pb, pos, SEEK_SET);
6eb2de74
RS
1022 avi->stream_index= -1;
1023 return 0;
1024 }
1025
155e9ee9 1026 for(i = 0; i < s->nb_streams; i++) {
52a0bbff
MN
1027 AVStream *st2 = s->streams[i];
1028 AVIStream *ast2 = st2->priv_data;
7c7f3866
MN
1029
1030 ast2->packet_size=
1031 ast2->remaining= 0;
1032
52a0bbff
MN
1033 if (st2->nb_index_entries <= 0)
1034 continue;
115329f1 1035
e84dab5f 1036// assert(st2->codec->block_align);
62f25230 1037 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
52a0bbff 1038 index = av_index_search_timestamp(
115329f1 1039 st2,
52a0bbff
MN
1040 av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
1041 flags | AVSEEK_FLAG_BACKWARD);
1042 if(index<0)
1043 index=0;
115329f1 1044
7c7f3866
MN
1045 if(!avi->non_interleaved){
1046 while(index>0 && st2->index_entries[index].pos > pos)
1047 index--;
1048 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1049 index++;
1050 }
1051
949b1a13 1052// av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
52a0bbff
MN
1053 /* extract the current frame number */
1054 ast2->frame_offset = st2->index_entries[index].timestamp;
1055 if(ast2->sample_size)
1056 ast2->frame_offset *=ast2->sample_size;
155e9ee9 1057 }
52a0bbff 1058
155e9ee9 1059 /* do the seek */
899681cd 1060 url_fseek(s->pb, pos, SEEK_SET);
7c7f3866 1061 avi->stream_index= -1;
155e9ee9
FB
1062 return 0;
1063}
1064
1101abfe 1065static int avi_read_close(AVFormatContext *s)
de6d9b64 1066{
5ae2c73e
MN
1067 int i;
1068 AVIContext *avi = s->priv_data;
5ae2c73e
MN
1069
1070 for(i=0;i<s->nb_streams;i++) {
1071 AVStream *st = s->streams[i];
01f4895c 1072 av_free(st->codec->palctrl);
5ae2c73e
MN
1073 }
1074
7458ccbb
RS
1075 if (avi->dv_demux)
1076 av_free(avi->dv_demux);
1077
c9a65ca8
FB
1078 return 0;
1079}
1080
1081static int avi_probe(AVProbeData *p)
1082{
7b31b092
AJ
1083 int i;
1084
c9a65ca8 1085 /* check file header */
7b31b092
AJ
1086 for(i=0; avi_headers[i][0]; i++)
1087 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1088 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1089 return AVPROBE_SCORE_MAX;
1090
1091 return 0;
c9a65ca8
FB
1092}
1093
ff70e601 1094AVInputFormat avi_demuxer = {
c9a65ca8 1095 "avi",
bde15e74 1096 NULL_IF_CONFIG_SMALL("AVI format"),
c9a65ca8
FB
1097 sizeof(AVIContext),
1098 avi_probe,
1099 avi_read_header,
1100 avi_read_packet,
1101 avi_read_close,
155e9ee9 1102 avi_read_seek,
c9a65ca8 1103};