Duplicate rounding that MS does in one of their implementations of an avi demuxer.
[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 */
7b114c09 21
c13b250b
BC
22//#define DEBUG
23//#define DEBUG_SEEK
24
2bb6eba2 25#include "libavutil/intreadwrite.h"
7b114c09 26#include "libavutil/bswap.h"
de6d9b64
FB
27#include "avformat.h"
28#include "avi.h"
7458ccbb 29#include "dv.h"
9d9f4119 30#include "riff.h"
de6d9b64 31
52a0bbff
MN
32#undef NDEBUG
33#include <assert.h>
34
155e9ee9 35typedef struct AVIStream {
7c7f3866 36 int64_t frame_offset; /* current frame (video) or byte (audio) counter
155e9ee9 37 (used to compute the pts) */
7c7f3866
MN
38 int remaining;
39 int packet_size;
40
155e9ee9 41 int scale;
115329f1 42 int rate;
8223bca5 43 int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
115329f1 44
94d1d6c0 45 int64_t cum_len; /* temporary storage (used during seek) */
115329f1 46
d2c5f0a4
MN
47 int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
48 int prefix_count;
b7c40744
MN
49 uint32_t pal[256];
50 int has_pal;
d01144b9 51 int block_align; ///< AVCodecContext.block_align copied here for easier access
155e9ee9 52} AVIStream;
de6d9b64
FB
53
54typedef struct {
7458ccbb
RS
55 int64_t riff_end;
56 int64_t movi_end;
ea4b2b5e 57 int64_t fsize;
bc5c918e 58 int64_t movi_list;
7ccc636f 59 int64_t last_pkt_pos;
155e9ee9 60 int index_loaded;
8f9298f8 61 int is_odml;
7c7f3866
MN
62 int non_interleaved;
63 int stream_index;
ddaae6a9 64 DVDemuxContext* dv_demux;
0c0fd063
MN
65 int odml_depth;
66#define MAX_ODML_DEPTH 1000
de6d9b64
FB
67} AVIContext;
68
7b31b092
AJ
69static const char avi_headers[][8] = {
70 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
71 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
72 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
b925ef61 73 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
0b04ebb3 74 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
7b31b092
AJ
75 { 0 }
76};
77
42feef6b 78static int avi_load_index(AVFormatContext *s);
30a43f2d 79static int guess_ni_flag(AVFormatContext *s);
42feef6b 80
de6d9b64 81#ifdef DEBUG
1101abfe 82static void print_tag(const char *str, unsigned int tag, int size)
de6d9b64 83{
c13b250b 84 dprintf(NULL, "%s: tag=%c%c%c%c size=0x%x\n",
de6d9b64
FB
85 str, tag & 0xff,
86 (tag >> 8) & 0xff,
87 (tag >> 16) & 0xff,
88 (tag >> 24) & 0xff,
89 size);
90}
91#endif
92
8a472821
MN
93static inline int get_duration(AVIStream *ast, int len){
94 if(ast->sample_size){
95 return len;
d01144b9
MN
96 }else if (ast->block_align){
97 return (len + ast->block_align - 1)/ast->block_align;
8a472821
MN
98 }else
99 return 1;
100}
101
87ad63c0 102static int get_riff(AVFormatContext *s, ByteIOContext *pb)
06219cb1 103{
87ad63c0 104 AVIContext *avi = s->priv_data;
7b31b092
AJ
105 char header[8];
106 int i;
06219cb1 107
7b31b092
AJ
108 /* check RIFF header */
109 get_buffer(pb, header, 4);
06219cb1
RS
110 avi->riff_end = get_le32(pb); /* RIFF chunk size */
111 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
7b31b092
AJ
112 get_buffer(pb, header+4, 4);
113
114 for(i=0; avi_headers[i][0]; i++)
115 if(!memcmp(header, avi_headers[i], 8))
116 break;
117 if(!avi_headers[i][0])
06219cb1 118 return -1;
115329f1 119
7b31b092 120 if(header[7] == 0x19)
87ad63c0 121 av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
7b31b092 122
06219cb1
RS
123 return 0;
124}
125
94d1d6c0 126static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
8945ebb9 127 AVIContext *avi = s->priv_data;
899681cd 128 ByteIOContext *pb = s->pb;
94d1d6c0
MN
129 int longs_pre_entry= get_le16(pb);
130 int index_sub_type = get_byte(pb);
131 int index_type = get_byte(pb);
132 int entries_in_use = get_le32(pb);
133 int chunk_id = get_le32(pb);
134 int64_t base = get_le64(pb);
135 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
136 AVStream *st;
137 AVIStream *ast;
138 int i;
8945ebb9 139 int64_t last_pos= -1;
899681cd 140 int64_t filesize= url_fsize(s->pb);
94d1d6c0 141
965a63af 142#ifdef DEBUG_SEEK
949b1a13 143 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
144 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
145#endif
94d1d6c0 146
1ac08937 147 if(stream_id >= s->nb_streams || stream_id < 0)
94d1d6c0
MN
148 return -1;
149 st= s->streams[stream_id];
150 ast = st->priv_data;
151
152 if(index_sub_type)
153 return -1;
154
155 get_le32(pb);
156
157 if(index_type && longs_pre_entry != 2)
158 return -1;
159 if(index_type>1)
160 return -1;
161
965a63af
MN
162 if(filesize > 0 && base >= filesize){
163 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
164 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
165 base &= 0xFFFFFFFF;
166 else
167 return -1;
168 }
169
94d1d6c0
MN
170 for(i=0; i<entries_in_use; i++){
171 if(index_type){
30a43f2d 172 int64_t pos= get_le32(pb) + base - 8;
94d1d6c0 173 int len = get_le32(pb);
30a43f2d 174 int key= len >= 0;
94d1d6c0
MN
175 len &= 0x7FFFFFFF;
176
965a63af 177#ifdef DEBUG_SEEK
949b1a13 178 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
965a63af 179#endif
8ebe099a
MN
180 if(url_feof(pb))
181 return -1;
182
8945ebb9
MN
183 if(last_pos == pos || pos == base - 8)
184 avi->non_interleaved= 1;
df84d7d9 185 if(last_pos != pos && (len || !ast->sample_size))
83a4d356 186 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
30a43f2d 187
8a472821 188 ast->cum_len += get_duration(ast, len);
8945ebb9 189 last_pos= pos;
94d1d6c0 190 }else{
26b89135
MR
191 int64_t offset, pos;
192 int duration;
193 offset = get_le64(pb);
194 get_le32(pb); /* size */
195 duration = get_le32(pb);
8ebe099a
MN
196
197 if(url_feof(pb))
198 return -1;
199
26b89135 200 pos = url_ftell(pb);
94d1d6c0 201
0c0fd063
MN
202 if(avi->odml_depth > MAX_ODML_DEPTH){
203 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
204 return -1;
205 }
206
94d1d6c0 207 url_fseek(pb, offset+8, SEEK_SET);
0c0fd063 208 avi->odml_depth++;
94d1d6c0 209 read_braindead_odml_indx(s, frame_num);
0c0fd063 210 avi->odml_depth--;
94d1d6c0
MN
211 frame_num += duration;
212
213 url_fseek(pb, pos, SEEK_SET);
214 }
215 }
965a63af 216 avi->index_loaded=1;
94d1d6c0
MN
217 return 0;
218}
219
115e8ae5 220static void clean_index(AVFormatContext *s){
965a63af
MN
221 int i;
222 int64_t j;
115e8ae5
MN
223
224 for(i=0; i<s->nb_streams; i++){
225 AVStream *st = s->streams[i];
226 AVIStream *ast = st->priv_data;
227 int n= st->nb_index_entries;
228 int max= ast->sample_size;
229 int64_t pos, size, ts;
230
231 if(n != 1 || ast->sample_size==0)
232 continue;
233
234 while(max < 1024) max+=max;
235
236 pos= st->index_entries[0].pos;
237 size= st->index_entries[0].size;
238 ts= st->index_entries[0].timestamp;
239
240 for(j=0; j<size; j+=max){
83a4d356 241 av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
115e8ae5
MN
242 }
243 }
244}
245
04d2540c 246static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
57060f89 247{
47146dfb 248 ByteIOContext *pb = s->pb;
04d2540c 249 char key[5] = {0}, *value;
47146dfb 250
57060f89 251 size += (size & 1);
47146dfb 252
12ad6671
MN
253 if (size == UINT_MAX)
254 return -1;
255 value = av_malloc(size+1);
256 if (!value)
257 return -1;
7a9af8ec
MN
258 get_buffer(pb, value, size);
259 value[size]=0;
12ad6671 260
04d2540c
AK
261 AV_WL32(key, tag);
262
7a9af8ec
MN
263 if(st)
264 return av_metadata_set2(&st->metadata, key, value,
265 AV_METADATA_DONT_STRDUP_VAL);
266 else
12ad6671
MN
267 return av_metadata_set2(&s->metadata, key, value,
268 AV_METADATA_DONT_STRDUP_VAL);
57060f89
DC
269}
270
04d2540c
AK
271static void avi_read_info(AVFormatContext *s, uint64_t end)
272{
273 while (url_ftell(s->pb) < end) {
274 uint32_t tag = get_le32(s->pb);
275 uint32_t size = get_le32(s->pb);
276 avi_read_tag(s, NULL, tag, size);
277 }
278}
279
1101abfe 280static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
de6d9b64 281{
c9a65ca8 282 AVIContext *avi = s->priv_data;
899681cd 283 ByteIOContext *pb = s->pb;
9d9aac84 284 unsigned int tag, tag1, handler;
b53f1064 285 int codec_type, stream_index, frame_period, bit_rate;
bce8840a 286 unsigned int size;
6d29fba9 287 int i;
de6d9b64 288 AVStream *st;
26b89135 289 AVIStream *ast = NULL;
0b04ebb3
VV
290 int avih_width=0, avih_height=0;
291 int amv_file_format=0;
5a4a4d78 292 uint64_t list_end = 0;
de6d9b64 293
7c7f3866 294 avi->stream_index= -1;
115329f1 295
037c08d6 296 if (get_riff(s, pb) < 0)
de6d9b64 297 return -1;
1101abfe 298
ea4b2b5e
MN
299 avi->fsize = url_fsize(pb);
300 if(avi->fsize<=0)
87657891 301 avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
ea4b2b5e 302
de6d9b64
FB
303 /* first list tag */
304 stream_index = -1;
305 codec_type = -1;
306 frame_period = 0;
307 for(;;) {
308 if (url_feof(pb))
309 goto fail;
310 tag = get_le32(pb);
311 size = get_le32(pb);
312#ifdef DEBUG
313 print_tag("tag", tag, size);
314#endif
315
316 switch(tag) {
317 case MKTAG('L', 'I', 'S', 'T'):
5a4a4d78 318 list_end = url_ftell(pb) + size;
15d6e361 319 /* Ignored, except at start of video packets. */
de6d9b64
FB
320 tag1 = get_le32(pb);
321#ifdef DEBUG
322 print_tag("list", tag1, 0);
323#endif
324 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
155e9ee9 325 avi->movi_list = url_ftell(pb) - 4;
2064c77a 326 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
a965c478 327 else avi->movi_end = url_fsize(pb);
c13b250b 328 dprintf(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
de6d9b64
FB
329 goto end_of_header;
330 }
04d2540c
AK
331 else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
332 avi_read_info(s, list_end);
333
de6d9b64 334 break;
8f9298f8 335 case MKTAG('d', 'm', 'l', 'h'):
bb270c08
DB
336 avi->is_odml = 1;
337 url_fskip(pb, size + (size & 1));
338 break;
0b04ebb3
VV
339 case MKTAG('a', 'm', 'v', 'h'):
340 amv_file_format=1;
de6d9b64 341 case MKTAG('a', 'v', 'i', 'h'):
15d6e361 342 /* AVI header */
1101abfe 343 /* using frame_period is bad idea */
de6d9b64
FB
344 frame_period = get_le32(pb);
345 bit_rate = get_le32(pb) * 8;
1894edeb
MN
346 get_le32(pb);
347 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
348
349 url_fskip(pb, 2 * 4);
6d29fba9 350 get_le32(pb);
0b04ebb3
VV
351 get_le32(pb);
352 avih_width=get_le32(pb);
353 avih_height=get_le32(pb);
6d29fba9 354
0b04ebb3 355 url_fskip(pb, size - 10 * 4);
6d29fba9
MN
356 break;
357 case MKTAG('s', 't', 'r', 'h'):
358 /* stream header */
359
360 tag1 = get_le32(pb);
361 handler = get_le32(pb); /* codec tag */
362
363 if(tag1 == MKTAG('p', 'a', 'd', 's')){
364 url_fskip(pb, size - 8);
365 break;
366 }else{
367 stream_index++;
368 st = av_new_stream(s, stream_index);
de6d9b64
FB
369 if (!st)
370 goto fail;
9ee91c2f 371
155e9ee9
FB
372 ast = av_mallocz(sizeof(AVIStream));
373 if (!ast)
374 goto fail;
375 st->priv_data = ast;
bb270c08 376 }
0b04ebb3
VV
377 if(amv_file_format)
378 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
6d29fba9 379
cc11e2b3 380#ifdef DEBUG
e344c1ea 381 print_tag("strh", tag1, -1);
cc11e2b3 382#endif
b53f1064 383 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
6eb2de74
RS
384 int64_t dv_dur;
385
115329f1 386 /*
bb270c08 387 * After some consideration -- I don't think we
15d6e361 388 * have to support anything but DV in type1 AVIs.
bb270c08
DB
389 */
390 if (s->nb_streams != 1)
391 goto fail;
392
393 if (handler != MKTAG('d', 'v', 's', 'd') &&
394 handler != MKTAG('d', 'v', 'h', 'd') &&
395 handler != MKTAG('d', 'v', 's', 'l'))
396 goto fail;
397
398 ast = s->streams[0]->priv_data;
399 av_freep(&s->streams[0]->codec->extradata);
400 av_freep(&s->streams[0]);
401 s->nb_streams = 0;
49fb20cb 402 if (CONFIG_DV_DEMUXER) {
38ca53da
AJ
403 avi->dv_demux = dv_init_demux(s);
404 if (!avi->dv_demux)
405 goto fail;
a2a6332b 406 }
bb270c08
DB
407 s->streams[0]->priv_data = ast;
408 url_fskip(pb, 3 * 4);
409 ast->scale = get_le32(pb);
410 ast->rate = get_le32(pb);
6eb2de74
RS
411 url_fskip(pb, 4); /* start time */
412
413 dv_dur = get_le32(pb);
414 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
415 dv_dur *= AV_TIME_BASE;
416 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
417 }
418 /*
419 * else, leave duration alone; timing estimation in utils.c
15d6e361 420 * will make a guess based on bitrate.
6eb2de74
RS
421 */
422
bb270c08 423 stream_index = s->nb_streams - 1;
6eb2de74 424 url_fskip(pb, size - 9*4);
b53f1064
MN
425 break;
426 }
b559b29b 427
6d29fba9 428 assert(stream_index < s->nb_streams);
01f4895c 429 st->codec->stream_codec_tag= handler;
b559b29b 430
b53f1064
MN
431 get_le32(pb); /* flags */
432 get_le16(pb); /* priority */
433 get_le16(pb); /* language */
434 get_le32(pb); /* initial frame */
435 ast->scale = get_le32(pb);
436 ast->rate = get_le32(pb);
4a030a1f 437 if(!(ast->scale && ast->rate)){
15d6e361 438 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
439 if(frame_period){
440 ast->rate = 1000000;
441 ast->scale = frame_period;
442 }else{
443 ast->rate = 25;
444 ast->scale = 1;
445 }
4a030a1f 446 }
b53f1064 447 av_set_pts_info(st, 64, ast->scale, ast->rate);
115329f1 448
b72a2bc8 449 ast->cum_len=get_le32(pb); /* start */
bce8840a 450 st->nb_frames = get_le32(pb);
b559b29b 451
b53f1064 452 st->start_time = 0;
b53f1064
MN
453 get_le32(pb); /* buffer size */
454 get_le32(pb); /* quality */
455 ast->sample_size = get_le32(pb); /* sample ssize */
2b70eb2b 456 ast->cum_len *= FFMAX(1, ast->sample_size);
87ad63c0 457// av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
247eadca 458
b53f1064 459 switch(tag1) {
bb270c08 460 case MKTAG('v', 'i', 'd', 's'):
72415b2a 461 codec_type = AVMEDIA_TYPE_VIDEO;
247eadca 462
b53f1064 463 ast->sample_size = 0;
b53f1064
MN
464 break;
465 case MKTAG('a', 'u', 'd', 's'):
72415b2a 466 codec_type = AVMEDIA_TYPE_AUDIO;
9bf9a5fc 467 break;
cc11e2b3 468 case MKTAG('t', 'x', 't', 's'):
115329f1 469 //FIXME
72415b2a 470 codec_type = AVMEDIA_TYPE_DATA; //AVMEDIA_TYPE_SUB ? FIXME
cc11e2b3 471 break;
25176d6e 472 case MKTAG('d', 'a', 't', 's'):
72415b2a 473 codec_type = AVMEDIA_TYPE_DATA;
25176d6e 474 break;
9bf9a5fc 475 default:
30667f42 476 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
9bf9a5fc 477 goto fail;
de6d9b64 478 }
3c8d75e6
MN
479 if(ast->sample_size == 0)
480 st->duration = st->nb_frames;
2b70eb2b 481 ast->frame_offset= ast->cum_len;
b53f1064 482 url_fskip(pb, size - 12 * 4);
de6d9b64
FB
483 break;
484 case MKTAG('s', 't', 'r', 'f'):
485 /* stream header */
6d29fba9 486 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
de6d9b64
FB
487 url_fskip(pb, size);
488 } else {
5a4a4d78
RD
489 uint64_t cur_pos = url_ftell(pb);
490 if (cur_pos < list_end)
491 size = FFMIN(size, list_end - cur_pos);
de6d9b64
FB
492 st = s->streams[stream_index];
493 switch(codec_type) {
72415b2a 494 case AVMEDIA_TYPE_VIDEO:
0b04ebb3
VV
495 if(amv_file_format){
496 st->codec->width=avih_width;
497 st->codec->height=avih_height;
72415b2a 498 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
0b04ebb3
VV
499 st->codec->codec_id = CODEC_ID_AMV;
500 url_fskip(pb, size);
501 break;
502 }
de6d9b64 503 get_le32(pb); /* size */
01f4895c 504 st->codec->width = get_le32(pb);
31f2616d 505 st->codec->height = (int32_t)get_le32(pb);
de6d9b64 506 get_le16(pb); /* panes */
dd1c8f3e 507 st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
de6d9b64 508 tag1 = get_le32(pb);
b559b29b
MN
509 get_le32(pb); /* ImageSize */
510 get_le32(pb); /* XPelsPerMeter */
511 get_le32(pb); /* YPelsPerMeter */
512 get_le32(pb); /* ClrUsed */
513 get_le32(pb); /* ClrImportant */
514
bce8840a 515 if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
72415b2a 516 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
cbb79c0e
RD
517 st->codec->codec_tag = tag1;
518 st->codec->codec_id = CODEC_ID_XSUB;
519 break;
520 }
521
e344c1ea
SH
522 if(size > 10*4 && size<(1<<30)){
523 st->codec->extradata_size= size - 10*4;
524 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
3dcddf82
RD
525 if (!st->codec->extradata) {
526 st->codec->extradata_size= 0;
527 return AVERROR(ENOMEM);
528 }
e344c1ea
SH
529 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
530 }
115329f1 531
01f4895c 532 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
952c69c4 533 get_byte(pb);
b559b29b 534
15d6e361
DB
535 /* Extract palette from extradata if bpp <= 8. */
536 /* This code assumes that extradata contains only palette. */
537 /* This is true for all paletted codecs implemented in FFmpeg. */
dd1c8f3e 538 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
01f4895c 539 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
63613fe6 540#if HAVE_BIGENDIAN
01f4895c
MN
541 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
542 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
5e29abf8 543#else
01f4895c
MN
544 memcpy(st->codec->palctrl->palette, st->codec->extradata,
545 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
5e29abf8 546#endif
01f4895c 547 st->codec->palctrl->palette_changed = 1;
5e29abf8
RT
548 }
549
de6d9b64
FB
550#ifdef DEBUG
551 print_tag("video", tag1, 0);
552#endif
72415b2a 553 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
01f4895c 554 st->codec->codec_tag = tag1;
1a40491e 555 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
15d6e361 556 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
0941ee0f
CEH
557 // Support "Resolution 1:1" for Avid AVI Codec
558 if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
559 st->codec->extradata_size >= 31 &&
560 !memcmp(&st->codec->extradata[28], "1:1", 3))
561 st->codec->codec_id = CODEC_ID_RAWVIDEO;
31f2616d
MN
562
563 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
564 st->codec->extradata_size+= 9;
565 st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
566 if(st->codec->extradata)
567 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
568 }
569 st->codec->height= FFABS(st->codec->height);
570
b559b29b 571// url_fskip(pb, size - 5 * 4);
de6d9b64 572 break;
72415b2a 573 case AVMEDIA_TYPE_AUDIO:
1a40491e 574 ff_get_wav_header(pb, st->codec, size);
d01144b9 575 ast->block_align= st->codec->block_align;
78db672c 576 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
143b0820 577 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
78db672c
MN
578 ast->sample_size= st->codec->block_align;
579 }
bf29cbc2 580 if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
1cef9527 581 url_fskip(pb, 1);
5836d158 582 /* Force parsing as several audio frames can be in
15d6e361 583 * one packet and timestamps refer to packet start. */
a74008a4 584 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
15d6e361
DB
585 /* ADTS header is in extradata, AAC without header must be
586 * stored as exact frames. Parser not needed and it will
587 * fail. */
cbee7a69 588 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
57004ff1 589 st->need_parsing = AVSTREAM_PARSE_NONE;
8662900b
DB
590 /* AVI files with Xan DPCM audio (wrongly) declare PCM
591 * audio in the header but have Axan as stream_code_tag. */
2bb6eba2 592 if (st->codec->stream_codec_tag == AV_RL32("Axan")){
8662900b
DB
593 st->codec->codec_id = CODEC_ID_XAN_DPCM;
594 st->codec->codec_tag = 0;
595 }
0b04ebb3
VV
596 if (amv_file_format)
597 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
de6d9b64
FB
598 break;
599 default:
72415b2a 600 st->codec->codec_type = AVMEDIA_TYPE_DATA;
01f4895c
MN
601 st->codec->codec_id= CODEC_ID_NONE;
602 st->codec->codec_tag= 0;
de6d9b64
FB
603 url_fskip(pb, size);
604 break;
605 }
606 }
607 break;
94d1d6c0
MN
608 case MKTAG('i', 'n', 'd', 'x'):
609 i= url_ftell(pb);
2c00106c 610 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
b7b22558 611 read_braindead_odml_indx(s, 0);
b7b22558 612 }
94d1d6c0
MN
613 url_fseek(pb, i+size, SEEK_SET);
614 break;
c86ec2f4
MN
615 case MKTAG('v', 'p', 'r', 'p'):
616 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
617 AVRational active, active_aspect;
618
619 st = s->streams[stream_index];
620 get_le32(pb);
621 get_le32(pb);
622 get_le32(pb);
623 get_le32(pb);
624 get_le32(pb);
625
c86ec2f4 626 active_aspect.den= get_le16(pb);
61559562 627 active_aspect.num= get_le16(pb);
c86ec2f4
MN
628 active.num = get_le32(pb);
629 active.den = get_le32(pb);
630 get_le32(pb); //nbFieldsPerFrame
631
632 if(active_aspect.num && active_aspect.den && active.num && active.den){
59729451 633 st->sample_aspect_ratio= av_div_q(active_aspect, active);
c86ec2f4
MN
634//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
635 }
636 size -= 9*4;
637 }
638 url_fseek(pb, size, SEEK_CUR);
639 break;
7a9af8ec
MN
640 case MKTAG('s', 't', 'r', 'n'):
641 if(s->nb_streams){
04d2540c 642 avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
7a9af8ec
MN
643 break;
644 }
de6d9b64 645 default:
755c18ae 646 if(size > 1000000){
15d6e361
DB
647 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
648 "I will ignore it and try to continue anyway.\n");
755c18ae
MN
649 avi->movi_list = url_ftell(pb) - 4;
650 avi->movi_end = url_fsize(pb);
651 goto end_of_header;
652 }
de6d9b64
FB
653 /* skip tag */
654 size += (size & 1);
655 url_fskip(pb, size);
656 break;
657 }
658 }
659 end_of_header:
660 /* check stream number */
661 if (stream_index != s->nb_streams - 1) {
662 fail:
de6d9b64
FB
663 return -1;
664 }
1101abfe 665
b7b22558 666 if(!avi->index_loaded && !url_is_streamed(pb))
94d1d6c0 667 avi_load_index(s);
42feef6b 668 avi->index_loaded = 1;
30a43f2d 669 avi->non_interleaved |= guess_ni_flag(s);
fbfccc04
MN
670 for(i=0; i<s->nb_streams; i++){
671 AVStream *st = s->streams[i];
672 if(st->nb_index_entries)
673 break;
674 }
675 if(i==s->nb_streams && avi->non_interleaved) {
676 av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
677 avi->non_interleaved=0;
678 }
679
9d4cd3bf 680 if(avi->non_interleaved) {
15d6e361 681 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
115e8ae5 682 clean_index(s);
9d4cd3bf 683 }
115329f1 684
de6d9b64
FB
685 return 0;
686}
687
f080a7bd
MN
688static int get_stream_idx(int *d){
689 if( d[0] >= '0' && d[0] <= '9'
690 && d[1] >= '0' && d[1] <= '9'){
691 return (d[0] - '0') * 10 + (d[1] - '0');
692 }else{
693 return 100; //invalid stream ID
694 }
695}
696
1101abfe 697static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
de6d9b64
FB
698{
699 AVIContext *avi = s->priv_data;
899681cd 700 ByteIOContext *pb = s->pb;
f5007cc8
MN
701 int n, d[8];
702 unsigned int size;
bc5c918e 703 int64_t i, sync;
7458ccbb 704 void* dstr;
115329f1 705
49fb20cb 706 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
f5007cc8 707 int size = dv_get_packet(avi->dv_demux, pkt);
bb270c08
DB
708 if (size >= 0)
709 return size;
2af7e610 710 }
115329f1 711
7c7f3866 712 if(avi->non_interleaved){
79396ac6 713 int best_stream_index = 0;
7c7f3866
MN
714 AVStream *best_st= NULL;
715 AVIStream *best_ast;
716 int64_t best_ts= INT64_MAX;
717 int i;
115329f1 718
7c7f3866
MN
719 for(i=0; i<s->nb_streams; i++){
720 AVStream *st = s->streams[i];
721 AVIStream *ast = st->priv_data;
722 int64_t ts= ast->frame_offset;
2c14ded3 723 int64_t last_ts;
7c7f3866 724
b60de406
MV
725 if(!st->nb_index_entries)
726 continue;
727
2c14ded3
MV
728 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
729 if(!ast->remaining && ts > last_ts)
730 continue;
731
83a4d356 732 ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
7c7f3866 733
87ad63c0 734// av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
b60de406 735 if(ts < best_ts){
7c7f3866
MN
736 best_ts= ts;
737 best_st= st;
738 best_stream_index= i;
739 }
740 }
fce88d52
MN
741 if(!best_st)
742 return -1;
743
7c7f3866 744 best_ast = best_st->priv_data;
83a4d356 745 best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
7c7f3866
MN
746 if(best_ast->remaining)
747 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
25983dcd 748 else{
7c7f3866 749 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
25983dcd 750 if(i>=0)
83a4d356 751 best_ast->frame_offset= best_st->index_entries[i].timestamp;
25983dcd 752 }
7c7f3866 753
87ad63c0 754// av_log(s, AV_LOG_DEBUG, "%d\n", i);
7c7f3866
MN
755 if(i>=0){
756 int64_t pos= best_st->index_entries[i].pos;
5c89153e 757 pos += best_ast->packet_size - best_ast->remaining;
899681cd 758 url_fseek(s->pb, pos + 8, SEEK_SET);
87ad63c0 759// av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
115329f1 760
8223bca5
MN
761 assert(best_ast->remaining <= best_ast->packet_size);
762
1894edeb
MN
763 avi->stream_index= best_stream_index;
764 if(!best_ast->remaining)
8223bca5 765 best_ast->packet_size=
1894edeb 766 best_ast->remaining= best_st->index_entries[i].size;
7c7f3866
MN
767 }
768 }
115329f1 769
4a8d5135 770resync:
7c7f3866
MN
771 if(avi->stream_index >= 0){
772 AVStream *st= s->streams[ avi->stream_index ];
773 AVIStream *ast= st->priv_data;
c60a0f85 774 int size, err;
115329f1 775
e84dab5f 776 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
7c7f3866 777 size= INT_MAX;
115329f1 778 else if(ast->sample_size < 32)
28eb5773
RD
779 // arbitrary multiplier to avoid tiny packets for raw PCM data
780 size= 1024*ast->sample_size;
7c7f3866
MN
781 else
782 size= ast->sample_size;
783
784 if(size > ast->remaining)
785 size= ast->remaining;
7ccc636f 786 avi->last_pkt_pos= url_ftell(pb);
c60a0f85
MN
787 err= av_get_packet(pb, pkt, size);
788 if(err<0)
789 return err;
115329f1 790
b7c40744 791 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
c60a0f85
MN
792 void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
793 if(ptr){
b7c40744
MN
794 ast->has_pal=0;
795 pkt->size += 4*256;
c60a0f85 796 pkt->data= ptr;
b7c40744 797 memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
c60a0f85
MN
798 }else
799 av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
b7c40744
MN
800 }
801
49fb20cb 802 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
7c7f3866
MN
803 dstr = pkt->destruct;
804 size = dv_produce_packet(avi->dv_demux, pkt,
805 pkt->data, pkt->size);
806 pkt->destruct = dstr;
cc947f04 807 pkt->flags |= AV_PKT_FLAG_KEY;
7c7f3866 808 } else {
15d6e361 809 /* XXX: How to handle B-frames in AVI? */
7c7f3866
MN
810 pkt->dts = ast->frame_offset;
811// pkt->dts += ast->start;
812 if(ast->sample_size)
813 pkt->dts /= ast->sample_size;
87ad63c0 814//av_log(s, 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
815 pkt->stream_index = avi->stream_index;
816
72415b2a 817 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
4323b09d
MN
818 AVIndexEntry *e;
819 int index;
ded3c7da 820 assert(st->index_entries);
7c7f3866 821
83a4d356 822 index= av_index_search_timestamp(st, ast->frame_offset, 0);
4323b09d 823 e= &st->index_entries[index];
115329f1 824
4323b09d
MN
825 if(index >= 0 && e->timestamp == ast->frame_offset){
826 if (e->flags & AVINDEX_KEYFRAME)
cc947f04 827 pkt->flags |= AV_PKT_FLAG_KEY;
4323b09d 828 }
7c7f3866 829 } else {
cc947f04 830 pkt->flags |= AV_PKT_FLAG_KEY;
7c7f3866 831 }
8a472821 832 ast->frame_offset += get_duration(ast, pkt->size);
7c7f3866
MN
833 }
834 ast->remaining -= size;
835 if(!ast->remaining){
836 avi->stream_index= -1;
837 ast->packet_size= 0;
7c7f3866
MN
838 }
839
840 return size;
841 }
842
4a8d5135
MN
843 memset(d, -1, sizeof(int)*8);
844 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
df99755b 845 int j;
1101abfe 846
df99755b
MN
847 for(j=0; j<7; j++)
848 d[j]= d[j+1];
849 d[7]= get_byte(pb);
115329f1 850
df99755b 851 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
115329f1 852
f080a7bd 853 n= get_stream_idx(d+2);
87ad63c0 854//av_log(s, 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);
f5007cc8 855 if(i + (uint64_t)size > avi->fsize || d[0]<0)
d2c5f0a4 856 continue;
115329f1 857
d2c5f0a4
MN
858 //parse ix##
859 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
bb270c08 860 //parse JUNK
bc3a73bc
MN
861 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
862 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
8f9298f8 863 url_fskip(pb, size);
87ad63c0 864//av_log(s, AV_LOG_DEBUG, "SKIP\n");
4a8d5135 865 goto resync;
8f9298f8 866 }
d2c5f0a4 867
e471e3c4
AJ
868 //parse stray LIST
869 if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
870 url_fskip(pb, 4);
871 goto resync;
872 }
873
f080a7bd 874 n= get_stream_idx(d);
115329f1 875
7ccc636f
MN
876 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
877 continue;
878
7305d97f
MV
879 //detect ##ix chunk and skip
880 if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
881 url_fskip(pb, size);
882 goto resync;
883 }
884
d2c5f0a4 885 //parse ##dc/##wb
80e3a08c 886 if(n < s->nb_streams){
1ce50d32
MN
887 AVStream *st;
888 AVIStream *ast;
889 st = s->streams[n];
890 ast = st->priv_data;
41757171 891
79d6b9cb
MN
892 if(s->nb_streams>=2){
893 AVStream *st1 = s->streams[1];
894 AVIStream *ast1= st1->priv_data;
1ce50d32
MN
895 //workaround for broken small-file-bug402.avi
896 if( d[2] == 'w' && d[3] == 'b'
897 && n==0
72415b2a
SS
898 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
899 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1ce50d32
MN
900 && ast->prefix == 'd'*256+'c'
901 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
902 ){
903 n=1;
904 st = st1;
905 ast = ast1;
15d6e361 906 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
1ce50d32 907 }
79d6b9cb 908 }
41757171
MN
909
910
1ce50d32 911 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
cc947f04 912 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
1ce50d32 913 || st->discard >= AVDISCARD_ALL){
8a472821 914 ast->frame_offset += get_duration(ast, size);
b4aea108
MN
915 url_fskip(pb, size);
916 goto resync;
1ce50d32 917 }
d2c5f0a4 918
1ce50d32 919 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
b7c40744
MN
920 int k = get_byte(pb);
921 int last = (k + get_byte(pb) - 1) & 0xFF;
922
923 get_le16(pb); //flags
924
925 for (; k <= last; k++)
926 ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
927 ast->has_pal= 1;
928 goto resync;
1ce50d32
MN
929 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
930 d[2]*256+d[3] == ast->prefix /*||
931 (d[2] == 'd' && d[3] == 'c') ||
932 (d[2] == 'w' && d[3] == 'b')*/) {
d2c5f0a4 933
87ad63c0 934//av_log(s, AV_LOG_DEBUG, "OK\n");
1ce50d32
MN
935 if(d[2]*256+d[3] == ast->prefix)
936 ast->prefix_count++;
937 else{
938 ast->prefix= d[2]*256+d[3];
939 ast->prefix_count= 0;
940 }
d2c5f0a4 941
1ce50d32
MN
942 avi->stream_index= n;
943 ast->packet_size= size + 8;
944 ast->remaining= size;
ded3c7da 945
df84d7d9 946 if(size || !ast->sample_size){
1ce50d32
MN
947 uint64_t pos= url_ftell(pb) - 8;
948 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
83a4d356 949 av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
1ce50d32 950 }
ded3c7da 951 }
1ce50d32 952 goto resync;
ded3c7da 953 }
df99755b
MN
954 }
955 }
d2c5f0a4 956
1e04bbee 957 return AVERROR_EOF;
de6d9b64
FB
958}
959
15d6e361
DB
960/* XXX: We make the implicit supposition that the positions are sorted
961 for each stream. */
155e9ee9
FB
962static int avi_read_idx1(AVFormatContext *s, int size)
963{
7c7f3866 964 AVIContext *avi = s->priv_data;
899681cd 965 ByteIOContext *pb = s->pb;
155e9ee9
FB
966 int nb_index_entries, i;
967 AVStream *st;
968 AVIStream *ast;
155e9ee9 969 unsigned int index, tag, flags, pos, len;
7c7f3866 970 unsigned last_pos= -1;
115329f1 971
155e9ee9
FB
972 nb_index_entries = size / 16;
973 if (nb_index_entries <= 0)
974 return -1;
975
15d6e361 976 /* Read the entries and sort them in each stream component. */
155e9ee9
FB
977 for(i = 0; i < nb_index_entries; i++) {
978 tag = get_le32(pb);
979 flags = get_le32(pb);
980 pos = get_le32(pb);
981 len = get_le32(pb);
52a0bbff 982#if defined(DEBUG_SEEK)
87ad63c0 983 av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
155e9ee9
FB
984 i, tag, flags, pos, len);
985#endif
7c7f3866
MN
986 if(i==0 && pos > avi->movi_list)
987 avi->movi_list= 0; //FIXME better check
5c89153e 988 pos += avi->movi_list;
7c7f3866 989
155e9ee9
FB
990 index = ((tag & 0xff) - '0') * 10;
991 index += ((tag >> 8) & 0xff) - '0';
992 if (index >= s->nb_streams)
993 continue;
994 st = s->streams[index];
995 ast = st->priv_data;
115329f1 996
52a0bbff 997#if defined(DEBUG_SEEK)
87ad63c0 998 av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
52a0bbff 999#endif
8ebe099a
MN
1000 if(url_feof(pb))
1001 return -1;
1002
80e3a08c
MN
1003 if(last_pos == pos)
1004 avi->non_interleaved= 1;
df84d7d9 1005 else if(len || !ast->sample_size)
83a4d356 1006 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
8a472821 1007 ast->cum_len += get_duration(ast, len);
7c7f3866 1008 last_pos= pos;
155e9ee9
FB
1009 }
1010 return 0;
1011}
1012
7c7f3866 1013static int guess_ni_flag(AVFormatContext *s){
7c7f3866
MN
1014 int i;
1015 int64_t last_start=0;
1016 int64_t first_end= INT64_MAX;
8c68f25b 1017 int64_t oldpos= url_ftell(s->pb);
115329f1 1018
7c7f3866
MN
1019 for(i=0; i<s->nb_streams; i++){
1020 AVStream *st = s->streams[i];
7c7f3866 1021 int n= st->nb_index_entries;
8c68f25b 1022 unsigned int size;
7c7f3866
MN
1023
1024 if(n <= 0)
1025 continue;
1026
8c68f25b
MN
1027 if(n >= 2){
1028 int64_t pos= st->index_entries[0].pos;
1029 url_fseek(s->pb, pos + 4, SEEK_SET);
1030 size= get_le32(s->pb);
1031 if(pos + size > st->index_entries[1].pos)
1032 last_start= INT64_MAX;
1033 }
1034
7c7f3866
MN
1035 if(st->index_entries[0].pos > last_start)
1036 last_start= st->index_entries[0].pos;
1037 if(st->index_entries[n-1].pos < first_end)
1038 first_end= st->index_entries[n-1].pos;
1039 }
8c68f25b 1040 url_fseek(s->pb, oldpos, SEEK_SET);
7c7f3866
MN
1041 return last_start > first_end;
1042}
1043
155e9ee9
FB
1044static int avi_load_index(AVFormatContext *s)
1045{
1046 AVIContext *avi = s->priv_data;
899681cd 1047 ByteIOContext *pb = s->pb;
155e9ee9 1048 uint32_t tag, size;
bc5c918e 1049 int64_t pos= url_ftell(pb);
44ed34b7 1050 int ret = -1;
115329f1 1051
44ed34b7
RD
1052 if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0)
1053 goto the_end; // maybe truncated file
155e9ee9 1054#ifdef DEBUG_SEEK
949b1a13 1055 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
155e9ee9
FB
1056#endif
1057 for(;;) {
1058 if (url_feof(pb))
1059 break;
1060 tag = get_le32(pb);
1061 size = get_le32(pb);
1062#ifdef DEBUG_SEEK
1063 printf("tag=%c%c%c%c size=0x%x\n",
1064 tag & 0xff,
1065 (tag >> 8) & 0xff,
1066 (tag >> 16) & 0xff,
1067 (tag >> 24) & 0xff,
1068 size);
1069#endif
1070 switch(tag) {
1071 case MKTAG('i', 'd', 'x', '1'):
1072 if (avi_read_idx1(s, size) < 0)
1073 goto skip;
44ed34b7 1074 ret = 0;
155e9ee9
FB
1075 goto the_end;
1076 break;
1077 default:
1078 skip:
1079 size += (size & 1);
44ed34b7
RD
1080 if (url_fseek(pb, size, SEEK_CUR) < 0)
1081 goto the_end; // something is wrong here
155e9ee9
FB
1082 break;
1083 }
1084 }
1085 the_end:
e6c0297f 1086 url_fseek(pb, pos, SEEK_SET);
44ed34b7 1087 return ret;
155e9ee9
FB
1088}
1089
7b3c1382 1090static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
155e9ee9
FB
1091{
1092 AVIContext *avi = s->priv_data;
1093 AVStream *st;
52a0bbff 1094 int i, index;
155e9ee9 1095 int64_t pos;
83a4d356 1096 AVIStream *ast;
155e9ee9
FB
1097
1098 if (!avi->index_loaded) {
1099 /* we only load the index on demand */
1100 avi_load_index(s);
1101 avi->index_loaded = 1;
1102 }
52a0bbff 1103 assert(stream_index>= 0);
155e9ee9
FB
1104
1105 st = s->streams[stream_index];
83a4d356
MN
1106 ast= st->priv_data;
1107 index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
52a0bbff 1108 if(index<0)
155e9ee9 1109 return -1;
115329f1 1110
155e9ee9 1111 /* find the position */
52a0bbff 1112 pos = st->index_entries[index].pos;
83a4d356 1113 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
52a0bbff 1114
87ad63c0 1115// av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
155e9ee9 1116
49fb20cb 1117 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
6eb2de74 1118 /* One and only one real stream for DV in AVI, and it has video */
f4433de9 1119 /* offsets. Calling with other stream indexes should have failed */
6eb2de74
RS
1120 /* the av_index_search_timestamp call above. */
1121 assert(stream_index == 0);
1122
1123 /* Feed the DV video stream version of the timestamp to the */
15d6e361 1124 /* DV demux so it can synthesize correct timestamps. */
6eb2de74
RS
1125 dv_offset_reset(avi->dv_demux, timestamp);
1126
899681cd 1127 url_fseek(s->pb, pos, SEEK_SET);
6eb2de74
RS
1128 avi->stream_index= -1;
1129 return 0;
1130 }
1131
155e9ee9 1132 for(i = 0; i < s->nb_streams; i++) {
52a0bbff
MN
1133 AVStream *st2 = s->streams[i];
1134 AVIStream *ast2 = st2->priv_data;
7c7f3866
MN
1135
1136 ast2->packet_size=
1137 ast2->remaining= 0;
1138
52a0bbff
MN
1139 if (st2->nb_index_entries <= 0)
1140 continue;
115329f1 1141
e84dab5f 1142// assert(st2->codec->block_align);
62f25230 1143 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
52a0bbff 1144 index = av_index_search_timestamp(
115329f1 1145 st2,
83a4d356 1146 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
52a0bbff
MN
1147 flags | AVSEEK_FLAG_BACKWARD);
1148 if(index<0)
1149 index=0;
115329f1 1150
7c7f3866
MN
1151 if(!avi->non_interleaved){
1152 while(index>0 && st2->index_entries[index].pos > pos)
1153 index--;
1154 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1155 index++;
1156 }
1157
87ad63c0 1158// av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
52a0bbff
MN
1159 /* extract the current frame number */
1160 ast2->frame_offset = st2->index_entries[index].timestamp;
155e9ee9 1161 }
52a0bbff 1162
155e9ee9 1163 /* do the seek */
899681cd 1164 url_fseek(s->pb, pos, SEEK_SET);
7c7f3866 1165 avi->stream_index= -1;
155e9ee9
FB
1166 return 0;
1167}
1168
1101abfe 1169static int avi_read_close(AVFormatContext *s)
de6d9b64 1170{
5ae2c73e
MN
1171 int i;
1172 AVIContext *avi = s->priv_data;
5ae2c73e
MN
1173
1174 for(i=0;i<s->nb_streams;i++) {
1175 AVStream *st = s->streams[i];
01f4895c 1176 av_free(st->codec->palctrl);
5ae2c73e
MN
1177 }
1178
7458ccbb
RS
1179 if (avi->dv_demux)
1180 av_free(avi->dv_demux);
1181
c9a65ca8
FB
1182 return 0;
1183}
1184
1185static int avi_probe(AVProbeData *p)
1186{
7b31b092
AJ
1187 int i;
1188
c9a65ca8 1189 /* check file header */
7b31b092
AJ
1190 for(i=0; avi_headers[i][0]; i++)
1191 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1192 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1193 return AVPROBE_SCORE_MAX;
1194
1195 return 0;
c9a65ca8
FB
1196}
1197
ff70e601 1198AVInputFormat avi_demuxer = {
c9a65ca8 1199 "avi",
bde15e74 1200 NULL_IF_CONFIG_SMALL("AVI format"),
c9a65ca8
FB
1201 sizeof(AVIContext),
1202 avi_probe,
1203 avi_read_header,
1204 avi_read_packet,
1205 avi_read_close,
155e9ee9 1206 avi_read_seek,
04d2540c 1207 .metadata_conv = ff_avi_metadata_conv,
c9a65ca8 1208};