avformat: Remove non-compiling and/or silly commented-out printf/av_log statements
[libav.git] / libavformat / avidec.c
1 /*
2 * AVI demuxer
3 * Copyright (c) 2001 Fabrice Bellard
4 *
5 * This file is part of Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/mathematics.h"
24 #include "libavutil/bswap.h"
25 #include "libavutil/dict.h"
26 #include "libavutil/avstring.h"
27 #include "avformat.h"
28 #include "internal.h"
29 #include "avi.h"
30 #include "dv.h"
31 #include "riff.h"
32
33 #undef NDEBUG
34 #include <assert.h>
35
36 typedef struct AVIStream {
37 int64_t frame_offset; /* current frame (video) or byte (audio) counter
38 (used to compute the pts) */
39 int remaining;
40 int packet_size;
41
42 uint32_t scale;
43 uint32_t rate;
44 int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
45
46 int64_t cum_len; /* temporary storage (used during seek) */
47
48 int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
49 int prefix_count;
50 uint32_t pal[256];
51 int has_pal;
52 int dshow_block_align; ///< block align variable used to emulate bugs in the MS dshow demuxer
53
54 AVFormatContext *sub_ctx;
55 AVPacket sub_pkt;
56 uint8_t *sub_buffer;
57 } AVIStream;
58
59 typedef struct {
60 int64_t riff_end;
61 int64_t movi_end;
62 int64_t fsize;
63 int64_t movi_list;
64 int64_t last_pkt_pos;
65 int index_loaded;
66 int is_odml;
67 int non_interleaved;
68 int stream_index;
69 DVDemuxContext* dv_demux;
70 int odml_depth;
71 #define MAX_ODML_DEPTH 1000
72 } AVIContext;
73
74 static const char avi_headers[][8] = {
75 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
76 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
77 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
78 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
79 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
80 { 0 }
81 };
82
83 static const AVMetadataConv avi_metadata_conv[] = {
84 { "strn", "title" },
85 { 0 },
86 };
87
88 static int avi_load_index(AVFormatContext *s);
89 static int guess_ni_flag(AVFormatContext *s);
90
91 #define print_tag(str, tag, size) \
92 av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n", \
93 str, tag & 0xff, \
94 (tag >> 8) & 0xff, \
95 (tag >> 16) & 0xff, \
96 (tag >> 24) & 0xff, \
97 size)
98
99 static inline int get_duration(AVIStream *ast, int len){
100 if(ast->sample_size){
101 return len;
102 }else if (ast->dshow_block_align){
103 return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
104 }else
105 return 1;
106 }
107
108 static int get_riff(AVFormatContext *s, AVIOContext *pb)
109 {
110 AVIContext *avi = s->priv_data;
111 char header[8];
112 int i;
113
114 /* check RIFF header */
115 avio_read(pb, header, 4);
116 avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
117 avi->riff_end += avio_tell(pb); /* RIFF chunk end */
118 avio_read(pb, header+4, 4);
119
120 for(i=0; avi_headers[i][0]; i++)
121 if(!memcmp(header, avi_headers[i], 8))
122 break;
123 if(!avi_headers[i][0])
124 return -1;
125
126 if(header[7] == 0x19)
127 av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
128
129 return 0;
130 }
131
132 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
133 AVIContext *avi = s->priv_data;
134 AVIOContext *pb = s->pb;
135 int longs_pre_entry= avio_rl16(pb);
136 int index_sub_type = avio_r8(pb);
137 int index_type = avio_r8(pb);
138 int entries_in_use = avio_rl32(pb);
139 int chunk_id = avio_rl32(pb);
140 int64_t base = avio_rl64(pb);
141 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
142 AVStream *st;
143 AVIStream *ast;
144 int i;
145 int64_t last_pos= -1;
146 int64_t filesize= avio_size(s->pb);
147
148 av_dlog(s, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
149 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
150
151 if(stream_id >= s->nb_streams || stream_id < 0)
152 return -1;
153 st= s->streams[stream_id];
154 ast = st->priv_data;
155
156 if(index_sub_type)
157 return -1;
158
159 avio_rl32(pb);
160
161 if(index_type && longs_pre_entry != 2)
162 return -1;
163 if(index_type>1)
164 return -1;
165
166 if(filesize > 0 && base >= filesize){
167 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
168 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
169 base &= 0xFFFFFFFF;
170 else
171 return -1;
172 }
173
174 for(i=0; i<entries_in_use; i++){
175 if(index_type){
176 int64_t pos= avio_rl32(pb) + base - 8;
177 int len = avio_rl32(pb);
178 int key= len >= 0;
179 len &= 0x7FFFFFFF;
180
181 av_dlog(s, "pos:%"PRId64", len:%X\n", pos, len);
182
183 if(pb->eof_reached)
184 return -1;
185
186 if(last_pos == pos || pos == base - 8)
187 avi->non_interleaved= 1;
188 if(last_pos != pos && (len || !ast->sample_size))
189 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
190
191 ast->cum_len += get_duration(ast, len);
192 last_pos= pos;
193 }else{
194 int64_t offset, pos;
195 int duration;
196 offset = avio_rl64(pb);
197 avio_rl32(pb); /* size */
198 duration = avio_rl32(pb);
199
200 if(pb->eof_reached)
201 return -1;
202
203 pos = avio_tell(pb);
204
205 if(avi->odml_depth > MAX_ODML_DEPTH){
206 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
207 return -1;
208 }
209
210 avio_seek(pb, offset+8, SEEK_SET);
211 avi->odml_depth++;
212 read_braindead_odml_indx(s, frame_num);
213 avi->odml_depth--;
214 frame_num += duration;
215
216 avio_seek(pb, pos, SEEK_SET);
217 }
218 }
219 avi->index_loaded=1;
220 return 0;
221 }
222
223 static void clean_index(AVFormatContext *s){
224 int i;
225 int64_t j;
226
227 for(i=0; i<s->nb_streams; i++){
228 AVStream *st = s->streams[i];
229 AVIStream *ast = st->priv_data;
230 int n= st->nb_index_entries;
231 int max= ast->sample_size;
232 int64_t pos, size, ts;
233
234 if(n != 1 || ast->sample_size==0)
235 continue;
236
237 while(max < 1024) max+=max;
238
239 pos= st->index_entries[0].pos;
240 size= st->index_entries[0].size;
241 ts= st->index_entries[0].timestamp;
242
243 for(j=0; j<size; j+=max){
244 av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
245 }
246 }
247 }
248
249 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
250 {
251 AVIOContext *pb = s->pb;
252 char key[5] = {0}, *value;
253
254 size += (size & 1);
255
256 if (size == UINT_MAX)
257 return -1;
258 value = av_malloc(size+1);
259 if (!value)
260 return -1;
261 avio_read(pb, value, size);
262 value[size]=0;
263
264 AV_WL32(key, tag);
265
266 return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
267 AV_DICT_DONT_STRDUP_VAL);
268 }
269
270 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
271 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
272
273 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
274 {
275 char month[4], time[9], buffer[64];
276 int i, day, year;
277 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
278 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
279 month, &day, time, &year) == 4) {
280 for (i=0; i<12; i++)
281 if (!av_strcasecmp(month, months[i])) {
282 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
283 year, i+1, day, time);
284 av_dict_set(metadata, "creation_time", buffer, 0);
285 }
286 } else if (date[4] == '/' && date[7] == '/') {
287 date[4] = date[7] = '-';
288 av_dict_set(metadata, "creation_time", date, 0);
289 }
290 }
291
292 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
293 {
294 while (avio_tell(s->pb) < end) {
295 uint32_t tag = avio_rl32(s->pb);
296 uint32_t size = avio_rl32(s->pb);
297 switch (tag) {
298 case MKTAG('n', 'c', 't', 'g'): { /* Nikon Tags */
299 uint64_t tag_end = avio_tell(s->pb) + size;
300 while (avio_tell(s->pb) < tag_end) {
301 uint16_t tag = avio_rl16(s->pb);
302 uint16_t size = avio_rl16(s->pb);
303 const char *name = NULL;
304 char buffer[64] = {0};
305 size -= avio_read(s->pb, buffer,
306 FFMIN(size, sizeof(buffer)-1));
307 switch (tag) {
308 case 0x03: name = "maker"; break;
309 case 0x04: name = "model"; break;
310 case 0x13: name = "creation_time";
311 if (buffer[4] == ':' && buffer[7] == ':')
312 buffer[4] = buffer[7] = '-';
313 break;
314 }
315 if (name)
316 av_dict_set(&s->metadata, name, buffer, 0);
317 avio_skip(s->pb, size);
318 }
319 break;
320 }
321 default:
322 avio_skip(s->pb, size);
323 break;
324 }
325 }
326 }
327
328 static int avi_read_header(AVFormatContext *s)
329 {
330 AVIContext *avi = s->priv_data;
331 AVIOContext *pb = s->pb;
332 unsigned int tag, tag1, handler;
333 int codec_type, stream_index, frame_period;
334 unsigned int size;
335 int i;
336 AVStream *st;
337 AVIStream *ast = NULL;
338 int avih_width=0, avih_height=0;
339 int amv_file_format=0;
340 uint64_t list_end = 0;
341 int ret;
342
343 avi->stream_index= -1;
344
345 if (get_riff(s, pb) < 0)
346 return -1;
347
348 avi->fsize = avio_size(pb);
349 if(avi->fsize<=0)
350 avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
351
352 /* first list tag */
353 stream_index = -1;
354 codec_type = -1;
355 frame_period = 0;
356 for(;;) {
357 if (pb->eof_reached)
358 goto fail;
359 tag = avio_rl32(pb);
360 size = avio_rl32(pb);
361
362 print_tag("tag", tag, size);
363
364 switch(tag) {
365 case MKTAG('L', 'I', 'S', 'T'):
366 list_end = avio_tell(pb) + size;
367 /* Ignored, except at start of video packets. */
368 tag1 = avio_rl32(pb);
369
370 print_tag("list", tag1, 0);
371
372 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
373 avi->movi_list = avio_tell(pb) - 4;
374 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
375 else avi->movi_end = avio_size(pb);
376 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
377 goto end_of_header;
378 }
379 else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
380 ff_read_riff_info(s, size - 4);
381 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
382 avi_read_nikon(s, list_end);
383
384 break;
385 case MKTAG('I', 'D', 'I', 'T'): {
386 unsigned char date[64] = {0};
387 size += (size & 1);
388 size -= avio_read(pb, date, FFMIN(size, sizeof(date)-1));
389 avio_skip(pb, size);
390 avi_metadata_creation_time(&s->metadata, date);
391 break;
392 }
393 case MKTAG('d', 'm', 'l', 'h'):
394 avi->is_odml = 1;
395 avio_skip(pb, size + (size & 1));
396 break;
397 case MKTAG('a', 'm', 'v', 'h'):
398 amv_file_format=1;
399 case MKTAG('a', 'v', 'i', 'h'):
400 /* AVI header */
401 /* using frame_period is bad idea */
402 frame_period = avio_rl32(pb);
403 avio_skip(pb, 4);
404 avio_rl32(pb);
405 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
406
407 avio_skip(pb, 2 * 4);
408 avio_rl32(pb);
409 avio_rl32(pb);
410 avih_width=avio_rl32(pb);
411 avih_height=avio_rl32(pb);
412
413 avio_skip(pb, size - 10 * 4);
414 break;
415 case MKTAG('s', 't', 'r', 'h'):
416 /* stream header */
417
418 tag1 = avio_rl32(pb);
419 handler = avio_rl32(pb); /* codec tag */
420
421 if(tag1 == MKTAG('p', 'a', 'd', 's')){
422 avio_skip(pb, size - 8);
423 break;
424 }else{
425 stream_index++;
426 st = avformat_new_stream(s, NULL);
427 if (!st)
428 goto fail;
429
430 st->id = stream_index;
431 ast = av_mallocz(sizeof(AVIStream));
432 if (!ast)
433 goto fail;
434 st->priv_data = ast;
435 }
436 if(amv_file_format)
437 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
438
439 print_tag("strh", tag1, -1);
440
441 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
442 int64_t dv_dur;
443
444 /*
445 * After some consideration -- I don't think we
446 * have to support anything but DV in type1 AVIs.
447 */
448 if (s->nb_streams != 1)
449 goto fail;
450
451 if (handler != MKTAG('d', 'v', 's', 'd') &&
452 handler != MKTAG('d', 'v', 'h', 'd') &&
453 handler != MKTAG('d', 'v', 's', 'l'))
454 goto fail;
455
456 ast = s->streams[0]->priv_data;
457 av_freep(&s->streams[0]->codec->extradata);
458 av_freep(&s->streams[0]->codec);
459 av_freep(&s->streams[0]);
460 s->nb_streams = 0;
461 if (CONFIG_DV_DEMUXER) {
462 avi->dv_demux = avpriv_dv_init_demux(s);
463 if (!avi->dv_demux)
464 goto fail;
465 }
466 s->streams[0]->priv_data = ast;
467 avio_skip(pb, 3 * 4);
468 ast->scale = avio_rl32(pb);
469 ast->rate = avio_rl32(pb);
470 avio_skip(pb, 4); /* start time */
471
472 dv_dur = avio_rl32(pb);
473 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
474 dv_dur *= AV_TIME_BASE;
475 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
476 }
477 /*
478 * else, leave duration alone; timing estimation in utils.c
479 * will make a guess based on bitrate.
480 */
481
482 stream_index = s->nb_streams - 1;
483 avio_skip(pb, size - 9*4);
484 break;
485 }
486
487 assert(stream_index < s->nb_streams);
488 st->codec->stream_codec_tag= handler;
489
490 avio_rl32(pb); /* flags */
491 avio_rl16(pb); /* priority */
492 avio_rl16(pb); /* language */
493 avio_rl32(pb); /* initial frame */
494 ast->scale = avio_rl32(pb);
495 ast->rate = avio_rl32(pb);
496 if(!(ast->scale && ast->rate)){
497 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);
498 if(frame_period){
499 ast->rate = 1000000;
500 ast->scale = frame_period;
501 }else{
502 ast->rate = 25;
503 ast->scale = 1;
504 }
505 }
506 avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
507
508 ast->cum_len=avio_rl32(pb); /* start */
509 st->nb_frames = avio_rl32(pb);
510
511 st->start_time = 0;
512 avio_rl32(pb); /* buffer size */
513 avio_rl32(pb); /* quality */
514 ast->sample_size = avio_rl32(pb); /* sample ssize */
515 ast->cum_len *= FFMAX(1, ast->sample_size);
516 // av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
517
518 switch(tag1) {
519 case MKTAG('v', 'i', 'd', 's'):
520 codec_type = AVMEDIA_TYPE_VIDEO;
521
522 ast->sample_size = 0;
523 break;
524 case MKTAG('a', 'u', 'd', 's'):
525 codec_type = AVMEDIA_TYPE_AUDIO;
526 break;
527 case MKTAG('t', 'x', 't', 's'):
528 codec_type = AVMEDIA_TYPE_SUBTITLE;
529 break;
530 case MKTAG('d', 'a', 't', 's'):
531 codec_type = AVMEDIA_TYPE_DATA;
532 break;
533 default:
534 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
535 goto fail;
536 }
537 if(ast->sample_size == 0)
538 st->duration = st->nb_frames;
539 ast->frame_offset= ast->cum_len;
540 avio_skip(pb, size - 12 * 4);
541 break;
542 case MKTAG('s', 't', 'r', 'f'):
543 /* stream header */
544 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
545 avio_skip(pb, size);
546 } else {
547 uint64_t cur_pos = avio_tell(pb);
548 if (cur_pos < list_end)
549 size = FFMIN(size, list_end - cur_pos);
550 st = s->streams[stream_index];
551 switch(codec_type) {
552 case AVMEDIA_TYPE_VIDEO:
553 if(amv_file_format){
554 st->codec->width=avih_width;
555 st->codec->height=avih_height;
556 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
557 st->codec->codec_id = AV_CODEC_ID_AMV;
558 avio_skip(pb, size);
559 break;
560 }
561 tag1 = ff_get_bmp_header(pb, st);
562
563 if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
564 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
565 st->codec->codec_tag = tag1;
566 st->codec->codec_id = AV_CODEC_ID_XSUB;
567 break;
568 }
569
570 if(size > 10*4 && size<(1<<30)){
571 st->codec->extradata_size= size - 10*4;
572 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
573 if (!st->codec->extradata) {
574 st->codec->extradata_size= 0;
575 return AVERROR(ENOMEM);
576 }
577 avio_read(pb, st->codec->extradata, st->codec->extradata_size);
578 }
579
580 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
581 avio_r8(pb);
582
583 /* Extract palette from extradata if bpp <= 8. */
584 /* This code assumes that extradata contains only palette. */
585 /* This is true for all paletted codecs implemented in Libav. */
586 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
587 int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
588 const uint8_t *pal_src;
589
590 pal_size = FFMIN(pal_size, st->codec->extradata_size);
591 pal_src = st->codec->extradata + st->codec->extradata_size - pal_size;
592 #if HAVE_BIGENDIAN
593 for (i = 0; i < pal_size/4; i++)
594 ast->pal[i] = av_bswap32(((uint32_t*)pal_src)[i]);
595 #else
596 memcpy(ast->pal, pal_src, pal_size);
597 #endif
598 ast->has_pal = 1;
599 }
600
601 print_tag("video", tag1, 0);
602
603 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
604 st->codec->codec_tag = tag1;
605 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
606 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
607 // Support "Resolution 1:1" for Avid AVI Codec
608 if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
609 st->codec->extradata_size >= 31 &&
610 !memcmp(&st->codec->extradata[28], "1:1", 3))
611 st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
612
613 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
614 st->codec->extradata_size+= 9;
615 st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
616 if(st->codec->extradata)
617 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
618 }
619 st->codec->height= FFABS(st->codec->height);
620
621 // avio_skip(pb, size - 5 * 4);
622 break;
623 case AVMEDIA_TYPE_AUDIO:
624 ret = ff_get_wav_header(pb, st->codec, size);
625 if (ret < 0)
626 return ret;
627 ast->dshow_block_align= st->codec->block_align;
628 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
629 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
630 ast->sample_size= st->codec->block_align;
631 }
632 if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
633 avio_skip(pb, 1);
634 /* Force parsing as several audio frames can be in
635 * one packet and timestamps refer to packet start. */
636 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
637 /* ADTS header is in extradata, AAC without header must be
638 * stored as exact frames. Parser not needed and it will
639 * fail. */
640 if (st->codec->codec_id == AV_CODEC_ID_AAC && st->codec->extradata_size)
641 st->need_parsing = AVSTREAM_PARSE_NONE;
642 /* AVI files with Xan DPCM audio (wrongly) declare PCM
643 * audio in the header but have Axan as stream_code_tag. */
644 if (st->codec->stream_codec_tag == AV_RL32("Axan")){
645 st->codec->codec_id = AV_CODEC_ID_XAN_DPCM;
646 st->codec->codec_tag = 0;
647 }
648 if (amv_file_format){
649 st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV;
650 ast->dshow_block_align = 0;
651 }
652 break;
653 case AVMEDIA_TYPE_SUBTITLE:
654 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
655 st->codec->codec_id = AV_CODEC_ID_PROBE;
656 break;
657 default:
658 st->codec->codec_type = AVMEDIA_TYPE_DATA;
659 st->codec->codec_id= AV_CODEC_ID_NONE;
660 st->codec->codec_tag= 0;
661 avio_skip(pb, size);
662 break;
663 }
664 }
665 break;
666 case MKTAG('i', 'n', 'd', 'x'):
667 i= avio_tell(pb);
668 if(pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
669 read_braindead_odml_indx(s, 0) < 0 &&
670 (s->error_recognition & AV_EF_EXPLODE))
671 goto fail;
672 avio_seek(pb, i+size, SEEK_SET);
673 break;
674 case MKTAG('v', 'p', 'r', 'p'):
675 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
676 AVRational active, active_aspect;
677
678 st = s->streams[stream_index];
679 avio_rl32(pb);
680 avio_rl32(pb);
681 avio_rl32(pb);
682 avio_rl32(pb);
683 avio_rl32(pb);
684
685 active_aspect.den= avio_rl16(pb);
686 active_aspect.num= avio_rl16(pb);
687 active.num = avio_rl32(pb);
688 active.den = avio_rl32(pb);
689 avio_rl32(pb); //nbFieldsPerFrame
690
691 if(active_aspect.num && active_aspect.den && active.num && active.den){
692 st->sample_aspect_ratio= av_div_q(active_aspect, active);
693 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
694 }
695 size -= 9*4;
696 }
697 avio_skip(pb, size);
698 break;
699 case MKTAG('s', 't', 'r', 'n'):
700 if(s->nb_streams){
701 avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
702 break;
703 }
704 default:
705 if(size > 1000000){
706 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
707 "I will ignore it and try to continue anyway.\n");
708 if (s->error_recognition & AV_EF_EXPLODE)
709 goto fail;
710 avi->movi_list = avio_tell(pb) - 4;
711 avi->movi_end = avio_size(pb);
712 goto end_of_header;
713 }
714 /* skip tag */
715 size += (size & 1);
716 avio_skip(pb, size);
717 break;
718 }
719 }
720 end_of_header:
721 /* check stream number */
722 if (stream_index != s->nb_streams - 1) {
723 fail:
724 return -1;
725 }
726
727 if(!avi->index_loaded && pb->seekable)
728 avi_load_index(s);
729 avi->index_loaded = 1;
730 avi->non_interleaved |= guess_ni_flag(s);
731 for(i=0; i<s->nb_streams; i++){
732 AVStream *st = s->streams[i];
733 if(st->nb_index_entries)
734 break;
735 }
736 if(i==s->nb_streams && avi->non_interleaved) {
737 av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
738 avi->non_interleaved=0;
739 }
740
741 if(avi->non_interleaved) {
742 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
743 clean_index(s);
744 }
745
746 ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
747 ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
748
749 return 0;
750 }
751
752 static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
753 if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
754 uint8_t desc[256];
755 int score = AVPROBE_SCORE_MAX / 2, ret;
756 AVIStream *ast = st->priv_data;
757 AVInputFormat *sub_demuxer;
758 AVRational time_base;
759 AVIOContext *pb = avio_alloc_context( pkt->data + 7,
760 pkt->size - 7,
761 0, NULL, NULL, NULL, NULL);
762 AVProbeData pd;
763 unsigned int desc_len = avio_rl32(pb);
764
765 if (desc_len > pb->buf_end - pb->buf_ptr)
766 goto error;
767
768 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
769 avio_skip(pb, desc_len - ret);
770 if (*desc)
771 av_dict_set(&st->metadata, "title", desc, 0);
772
773 avio_rl16(pb); /* flags? */
774 avio_rl32(pb); /* data size */
775
776 pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr };
777 if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
778 goto error;
779
780 if (!(ast->sub_ctx = avformat_alloc_context()))
781 goto error;
782
783 ast->sub_ctx->pb = pb;
784 if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
785 ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
786 *st->codec = *ast->sub_ctx->streams[0]->codec;
787 ast->sub_ctx->streams[0]->codec->extradata = NULL;
788 time_base = ast->sub_ctx->streams[0]->time_base;
789 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
790 }
791 ast->sub_buffer = pkt->data;
792 memset(pkt, 0, sizeof(*pkt));
793 return 1;
794 error:
795 av_freep(&pb);
796 }
797 return 0;
798 }
799
800 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
801 AVPacket *pkt)
802 {
803 AVIStream *ast, *next_ast = next_st->priv_data;
804 int64_t ts, next_ts, ts_min = INT64_MAX;
805 AVStream *st, *sub_st = NULL;
806 int i;
807
808 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
809 AV_TIME_BASE_Q);
810
811 for (i=0; i<s->nb_streams; i++) {
812 st = s->streams[i];
813 ast = st->priv_data;
814 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
815 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
816 if (ts <= next_ts && ts < ts_min) {
817 ts_min = ts;
818 sub_st = st;
819 }
820 }
821 }
822
823 if (sub_st) {
824 ast = sub_st->priv_data;
825 *pkt = ast->sub_pkt;
826 pkt->stream_index = sub_st->index;
827 if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
828 ast->sub_pkt.data = NULL;
829 }
830 return sub_st;
831 }
832
833 static int get_stream_idx(int *d){
834 if( d[0] >= '0' && d[0] <= '9'
835 && d[1] >= '0' && d[1] <= '9'){
836 return (d[0] - '0') * 10 + (d[1] - '0');
837 }else{
838 return 100; //invalid stream ID
839 }
840 }
841
842 static int avi_sync(AVFormatContext *s, int exit_early)
843 {
844 AVIContext *avi = s->priv_data;
845 AVIOContext *pb = s->pb;
846 int n;
847 unsigned int d[8];
848 unsigned int size;
849 int64_t i, sync;
850
851 start_sync:
852 memset(d, -1, sizeof(d));
853 for(i=sync=avio_tell(pb); !pb->eof_reached; i++) {
854 int j;
855
856 for(j=0; j<7; j++)
857 d[j]= d[j+1];
858 d[7]= avio_r8(pb);
859
860 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
861
862 n= get_stream_idx(d+2);
863 //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);
864 if(i + (uint64_t)size > avi->fsize || d[0] > 127)
865 continue;
866
867 //parse ix##
868 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
869 //parse JUNK
870 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
871 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
872 avio_skip(pb, size);
873 goto start_sync;
874 }
875
876 //parse stray LIST
877 if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
878 avio_skip(pb, 4);
879 goto start_sync;
880 }
881
882 n= get_stream_idx(d);
883
884 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
885 continue;
886
887 //detect ##ix chunk and skip
888 if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
889 avio_skip(pb, size);
890 goto start_sync;
891 }
892
893 //parse ##dc/##wb
894 if(n < s->nb_streams){
895 AVStream *st;
896 AVIStream *ast;
897 st = s->streams[n];
898 ast = st->priv_data;
899
900 if(s->nb_streams>=2){
901 AVStream *st1 = s->streams[1];
902 AVIStream *ast1= st1->priv_data;
903 //workaround for broken small-file-bug402.avi
904 if( d[2] == 'w' && d[3] == 'b'
905 && n==0
906 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
907 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
908 && ast->prefix == 'd'*256+'c'
909 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
910 ){
911 n=1;
912 st = st1;
913 ast = ast1;
914 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
915 }
916 }
917
918
919 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
920 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
921 || st->discard >= AVDISCARD_ALL){
922 if (!exit_early) {
923 ast->frame_offset += get_duration(ast, size);
924 }
925 avio_skip(pb, size);
926 goto start_sync;
927 }
928
929 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
930 int k = avio_r8(pb);
931 int last = (k + avio_r8(pb) - 1) & 0xFF;
932
933 avio_rl16(pb); //flags
934
935 for (; k <= last; k++)
936 ast->pal[k] = avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);
937 ast->has_pal= 1;
938 goto start_sync;
939 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
940 d[2]*256+d[3] == ast->prefix /*||
941 (d[2] == 'd' && d[3] == 'c') ||
942 (d[2] == 'w' && d[3] == 'b')*/) {
943
944 if (exit_early)
945 return 0;
946 if(d[2]*256+d[3] == ast->prefix)
947 ast->prefix_count++;
948 else{
949 ast->prefix= d[2]*256+d[3];
950 ast->prefix_count= 0;
951 }
952
953 avi->stream_index= n;
954 ast->packet_size= size + 8;
955 ast->remaining= size;
956
957 if(size || !ast->sample_size){
958 uint64_t pos= avio_tell(pb) - 8;
959 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
960 av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
961 }
962 }
963 return 0;
964 }
965 }
966 }
967
968 return AVERROR_EOF;
969 }
970
971 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
972 {
973 AVIContext *avi = s->priv_data;
974 AVIOContext *pb = s->pb;
975 int err;
976 void* dstr;
977
978 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
979 int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
980 if (size >= 0)
981 return size;
982 }
983
984 if(avi->non_interleaved){
985 int best_stream_index = 0;
986 AVStream *best_st= NULL;
987 AVIStream *best_ast;
988 int64_t best_ts= INT64_MAX;
989 int i;
990
991 for(i=0; i<s->nb_streams; i++){
992 AVStream *st = s->streams[i];
993 AVIStream *ast = st->priv_data;
994 int64_t ts= ast->frame_offset;
995 int64_t last_ts;
996
997 if(!st->nb_index_entries)
998 continue;
999
1000 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1001 if(!ast->remaining && ts > last_ts)
1002 continue;
1003
1004 ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
1005
1006 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
1007 if(ts < best_ts){
1008 best_ts= ts;
1009 best_st= st;
1010 best_stream_index= i;
1011 }
1012 }
1013 if(!best_st)
1014 return -1;
1015
1016 best_ast = best_st->priv_data;
1017 best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
1018 if(best_ast->remaining)
1019 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
1020 else{
1021 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1022 if(i>=0)
1023 best_ast->frame_offset= best_st->index_entries[i].timestamp;
1024 }
1025
1026 if(i>=0){
1027 int64_t pos= best_st->index_entries[i].pos;
1028 pos += best_ast->packet_size - best_ast->remaining;
1029 avio_seek(s->pb, pos + 8, SEEK_SET);
1030
1031 assert(best_ast->remaining <= best_ast->packet_size);
1032
1033 avi->stream_index= best_stream_index;
1034 if(!best_ast->remaining)
1035 best_ast->packet_size=
1036 best_ast->remaining= best_st->index_entries[i].size;
1037 }
1038 }
1039
1040 resync:
1041 if(avi->stream_index >= 0){
1042 AVStream *st= s->streams[ avi->stream_index ];
1043 AVIStream *ast= st->priv_data;
1044 int size, err;
1045
1046 if(get_subtitle_pkt(s, st, pkt))
1047 return 0;
1048
1049 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1050 size= INT_MAX;
1051 else if(ast->sample_size < 32)
1052 // arbitrary multiplier to avoid tiny packets for raw PCM data
1053 size= 1024*ast->sample_size;
1054 else
1055 size= ast->sample_size;
1056
1057 if(size > ast->remaining)
1058 size= ast->remaining;
1059 avi->last_pkt_pos= avio_tell(pb);
1060 err= av_get_packet(pb, pkt, size);
1061 if(err<0)
1062 return err;
1063
1064 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
1065 uint8_t *pal;
1066 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
1067 if(!pal){
1068 av_log(s, AV_LOG_ERROR, "Failed to allocate data for palette\n");
1069 }else{
1070 memcpy(pal, ast->pal, AVPALETTE_SIZE);
1071 ast->has_pal = 0;
1072 }
1073 }
1074
1075 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1076 dstr = pkt->destruct;
1077 size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1078 pkt->data, pkt->size);
1079 pkt->destruct = dstr;
1080 pkt->flags |= AV_PKT_FLAG_KEY;
1081 if (size < 0)
1082 av_free_packet(pkt);
1083 } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
1084 && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
1085 ast->frame_offset++;
1086 avi->stream_index = -1;
1087 ast->remaining = 0;
1088 goto resync;
1089 } else {
1090 /* XXX: How to handle B-frames in AVI? */
1091 pkt->dts = ast->frame_offset;
1092 // pkt->dts += ast->start;
1093 if(ast->sample_size)
1094 pkt->dts /= ast->sample_size;
1095 //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);
1096 pkt->stream_index = avi->stream_index;
1097
1098 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
1099 AVIndexEntry *e;
1100 int index;
1101 assert(st->index_entries);
1102
1103 index= av_index_search_timestamp(st, ast->frame_offset, 0);
1104 e= &st->index_entries[index];
1105
1106 if(index >= 0 && e->timestamp == ast->frame_offset){
1107 if (e->flags & AVINDEX_KEYFRAME)
1108 pkt->flags |= AV_PKT_FLAG_KEY;
1109 }
1110 } else {
1111 pkt->flags |= AV_PKT_FLAG_KEY;
1112 }
1113 ast->frame_offset += get_duration(ast, pkt->size);
1114 }
1115 ast->remaining -= err;
1116 if(!ast->remaining){
1117 avi->stream_index= -1;
1118 ast->packet_size= 0;
1119 }
1120
1121 return 0;
1122 }
1123
1124 if ((err = avi_sync(s, 0)) < 0)
1125 return err;
1126 goto resync;
1127 }
1128
1129 /* XXX: We make the implicit supposition that the positions are sorted
1130 for each stream. */
1131 static int avi_read_idx1(AVFormatContext *s, int size)
1132 {
1133 AVIContext *avi = s->priv_data;
1134 AVIOContext *pb = s->pb;
1135 int nb_index_entries, i;
1136 AVStream *st;
1137 AVIStream *ast;
1138 unsigned int index, tag, flags, pos, len, first_packet = 1;
1139 unsigned last_pos= -1;
1140 int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1141
1142 nb_index_entries = size / 16;
1143 if (nb_index_entries <= 0)
1144 return -1;
1145
1146 idx1_pos = avio_tell(pb);
1147 avio_seek(pb, avi->movi_list+4, SEEK_SET);
1148 if (avi_sync(s, 1) == 0) {
1149 first_packet_pos = avio_tell(pb) - 8;
1150 }
1151 avi->stream_index = -1;
1152 avio_seek(pb, idx1_pos, SEEK_SET);
1153
1154 /* Read the entries and sort them in each stream component. */
1155 for(i = 0; i < nb_index_entries; i++) {
1156 tag = avio_rl32(pb);
1157 flags = avio_rl32(pb);
1158 pos = avio_rl32(pb);
1159 len = avio_rl32(pb);
1160 av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1161 i, tag, flags, pos, len);
1162
1163 index = ((tag & 0xff) - '0') * 10;
1164 index += ((tag >> 8) & 0xff) - '0';
1165 if (index >= s->nb_streams)
1166 continue;
1167 st = s->streams[index];
1168 ast = st->priv_data;
1169
1170 if(first_packet && first_packet_pos && len) {
1171 data_offset = first_packet_pos - pos;
1172 first_packet = 0;
1173 }
1174 pos += data_offset;
1175
1176 av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1177
1178 if(pb->eof_reached)
1179 return -1;
1180
1181 if(last_pos == pos)
1182 avi->non_interleaved= 1;
1183 else if(len || !ast->sample_size)
1184 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1185 ast->cum_len += get_duration(ast, len);
1186 last_pos= pos;
1187 }
1188 return 0;
1189 }
1190
1191 static int guess_ni_flag(AVFormatContext *s){
1192 int i;
1193 int64_t last_start=0;
1194 int64_t first_end= INT64_MAX;
1195 int64_t oldpos= avio_tell(s->pb);
1196
1197 for(i=0; i<s->nb_streams; i++){
1198 AVStream *st = s->streams[i];
1199 int n= st->nb_index_entries;
1200 unsigned int size;
1201
1202 if(n <= 0)
1203 continue;
1204
1205 if(n >= 2){
1206 int64_t pos= st->index_entries[0].pos;
1207 avio_seek(s->pb, pos + 4, SEEK_SET);
1208 size= avio_rl32(s->pb);
1209 if(pos + size > st->index_entries[1].pos)
1210 last_start= INT64_MAX;
1211 }
1212
1213 if(st->index_entries[0].pos > last_start)
1214 last_start= st->index_entries[0].pos;
1215 if(st->index_entries[n-1].pos < first_end)
1216 first_end= st->index_entries[n-1].pos;
1217 }
1218 avio_seek(s->pb, oldpos, SEEK_SET);
1219 return last_start > first_end;
1220 }
1221
1222 static int avi_load_index(AVFormatContext *s)
1223 {
1224 AVIContext *avi = s->priv_data;
1225 AVIOContext *pb = s->pb;
1226 uint32_t tag, size;
1227 int64_t pos= avio_tell(pb);
1228 int ret = -1;
1229
1230 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1231 goto the_end; // maybe truncated file
1232 av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1233 for(;;) {
1234 if (pb->eof_reached)
1235 break;
1236 tag = avio_rl32(pb);
1237 size = avio_rl32(pb);
1238 av_dlog(s, "tag=%c%c%c%c size=0x%x\n",
1239 tag & 0xff,
1240 (tag >> 8) & 0xff,
1241 (tag >> 16) & 0xff,
1242 (tag >> 24) & 0xff,
1243 size);
1244
1245 if (tag == MKTAG('i', 'd', 'x', '1') &&
1246 avi_read_idx1(s, size) >= 0) {
1247 ret = 0;
1248 break;
1249 }
1250
1251 size += (size & 1);
1252 if (avio_skip(pb, size) < 0)
1253 break; // something is wrong here
1254 }
1255 the_end:
1256 avio_seek(pb, pos, SEEK_SET);
1257 return ret;
1258 }
1259
1260 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1261 {
1262 AVIStream *ast2 = st2->priv_data;
1263 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1264 av_free_packet(&ast2->sub_pkt);
1265 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1266 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1267 ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1268 }
1269
1270 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1271 {
1272 AVIContext *avi = s->priv_data;
1273 AVStream *st;
1274 int i, index;
1275 int64_t pos;
1276 AVIStream *ast;
1277
1278 if (!avi->index_loaded) {
1279 /* we only load the index on demand */
1280 avi_load_index(s);
1281 avi->index_loaded = 1;
1282 }
1283 assert(stream_index>= 0);
1284
1285 st = s->streams[stream_index];
1286 ast= st->priv_data;
1287 index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1288 if(index<0)
1289 return -1;
1290
1291 /* find the position */
1292 pos = st->index_entries[index].pos;
1293 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1294
1295 // av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1296
1297 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1298 /* One and only one real stream for DV in AVI, and it has video */
1299 /* offsets. Calling with other stream indexes should have failed */
1300 /* the av_index_search_timestamp call above. */
1301 assert(stream_index == 0);
1302
1303 /* Feed the DV video stream version of the timestamp to the */
1304 /* DV demux so it can synthesize correct timestamps. */
1305 ff_dv_offset_reset(avi->dv_demux, timestamp);
1306
1307 avio_seek(s->pb, pos, SEEK_SET);
1308 avi->stream_index= -1;
1309 return 0;
1310 }
1311
1312 for(i = 0; i < s->nb_streams; i++) {
1313 AVStream *st2 = s->streams[i];
1314 AVIStream *ast2 = st2->priv_data;
1315
1316 ast2->packet_size=
1317 ast2->remaining= 0;
1318
1319 if (ast2->sub_ctx) {
1320 seek_subtitle(st, st2, timestamp);
1321 continue;
1322 }
1323
1324 if (st2->nb_index_entries <= 0)
1325 continue;
1326
1327 // assert(st2->codec->block_align);
1328 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1329 index = av_index_search_timestamp(
1330 st2,
1331 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1332 flags | AVSEEK_FLAG_BACKWARD);
1333 if(index<0)
1334 index=0;
1335
1336 if(!avi->non_interleaved){
1337 while(index>0 && st2->index_entries[index].pos > pos)
1338 index--;
1339 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1340 index++;
1341 }
1342
1343 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1344 /* extract the current frame number */
1345 ast2->frame_offset = st2->index_entries[index].timestamp;
1346 }
1347
1348 /* do the seek */
1349 avio_seek(s->pb, pos, SEEK_SET);
1350 avi->stream_index= -1;
1351 return 0;
1352 }
1353
1354 static int avi_read_close(AVFormatContext *s)
1355 {
1356 int i;
1357 AVIContext *avi = s->priv_data;
1358
1359 for(i=0;i<s->nb_streams;i++) {
1360 AVStream *st = s->streams[i];
1361 AVIStream *ast = st->priv_data;
1362 if (ast) {
1363 if (ast->sub_ctx) {
1364 av_freep(&ast->sub_ctx->pb);
1365 avformat_close_input(&ast->sub_ctx);
1366 }
1367 av_free(ast->sub_buffer);
1368 av_free_packet(&ast->sub_pkt);
1369 }
1370 }
1371
1372 av_free(avi->dv_demux);
1373
1374 return 0;
1375 }
1376
1377 static int avi_probe(AVProbeData *p)
1378 {
1379 int i;
1380
1381 /* check file header */
1382 for(i=0; avi_headers[i][0]; i++)
1383 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1384 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1385 return AVPROBE_SCORE_MAX;
1386
1387 return 0;
1388 }
1389
1390 AVInputFormat ff_avi_demuxer = {
1391 .name = "avi",
1392 .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1393 .priv_data_size = sizeof(AVIContext),
1394 .read_probe = avi_probe,
1395 .read_header = avi_read_header,
1396 .read_packet = avi_read_packet,
1397 .read_close = avi_read_close,
1398 .read_seek = avi_read_seek,
1399 };