ae8d32045f2f8623385419229038892caec2d817
[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 //#define DEBUG
23 //#define DEBUG_SEEK
24
25 #include <strings.h>
26 #include "libavutil/intreadwrite.h"
27 #include "libavutil/bswap.h"
28 #include "avformat.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 int scale;
43 int 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 int avi_load_index(AVFormatContext *s);
84 static int guess_ni_flag(AVFormatContext *s);
85
86 #define print_tag(str, tag, size) \
87 av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n", \
88 str, tag & 0xff, \
89 (tag >> 8) & 0xff, \
90 (tag >> 16) & 0xff, \
91 (tag >> 24) & 0xff, \
92 size)
93
94 static inline int get_duration(AVIStream *ast, int len){
95 if(ast->sample_size){
96 return len;
97 }else if (ast->dshow_block_align){
98 return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
99 }else
100 return 1;
101 }
102
103 static int get_riff(AVFormatContext *s, AVIOContext *pb)
104 {
105 AVIContext *avi = s->priv_data;
106 char header[8];
107 int i;
108
109 /* check RIFF header */
110 avio_read(pb, header, 4);
111 avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
112 avi->riff_end += avio_tell(pb); /* RIFF chunk end */
113 avio_read(pb, header+4, 4);
114
115 for(i=0; avi_headers[i][0]; i++)
116 if(!memcmp(header, avi_headers[i], 8))
117 break;
118 if(!avi_headers[i][0])
119 return -1;
120
121 if(header[7] == 0x19)
122 av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
123
124 return 0;
125 }
126
127 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
128 AVIContext *avi = s->priv_data;
129 AVIOContext *pb = s->pb;
130 int longs_pre_entry= avio_rl16(pb);
131 int index_sub_type = avio_r8(pb);
132 int index_type = avio_r8(pb);
133 int entries_in_use = avio_rl32(pb);
134 int chunk_id = avio_rl32(pb);
135 int64_t base = avio_rl64(pb);
136 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
137 AVStream *st;
138 AVIStream *ast;
139 int i;
140 int64_t last_pos= -1;
141 int64_t filesize= avio_size(s->pb);
142
143 #ifdef DEBUG_SEEK
144 av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
145 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
146 #endif
147
148 if(stream_id >= s->nb_streams || stream_id < 0)
149 return -1;
150 st= s->streams[stream_id];
151 ast = st->priv_data;
152
153 if(index_sub_type)
154 return -1;
155
156 avio_rl32(pb);
157
158 if(index_type && longs_pre_entry != 2)
159 return -1;
160 if(index_type>1)
161 return -1;
162
163 if(filesize > 0 && base >= filesize){
164 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
165 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
166 base &= 0xFFFFFFFF;
167 else
168 return -1;
169 }
170
171 for(i=0; i<entries_in_use; i++){
172 if(index_type){
173 int64_t pos= avio_rl32(pb) + base - 8;
174 int len = avio_rl32(pb);
175 int key= len >= 0;
176 len &= 0x7FFFFFFF;
177
178 #ifdef DEBUG_SEEK
179 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
180 #endif
181 if(pb->eof_reached)
182 return -1;
183
184 if(last_pos == pos || pos == base - 8)
185 avi->non_interleaved= 1;
186 if(last_pos != pos && (len || !ast->sample_size))
187 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
188
189 ast->cum_len += get_duration(ast, len);
190 last_pos= pos;
191 }else{
192 int64_t offset, pos;
193 int duration;
194 offset = avio_rl64(pb);
195 avio_rl32(pb); /* size */
196 duration = avio_rl32(pb);
197
198 if(pb->eof_reached)
199 return -1;
200
201 pos = avio_tell(pb);
202
203 if(avi->odml_depth > MAX_ODML_DEPTH){
204 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
205 return -1;
206 }
207
208 avio_seek(pb, offset+8, SEEK_SET);
209 avi->odml_depth++;
210 read_braindead_odml_indx(s, frame_num);
211 avi->odml_depth--;
212 frame_num += duration;
213
214 avio_seek(pb, pos, SEEK_SET);
215 }
216 }
217 avi->index_loaded=1;
218 return 0;
219 }
220
221 static void clean_index(AVFormatContext *s){
222 int i;
223 int64_t j;
224
225 for(i=0; i<s->nb_streams; i++){
226 AVStream *st = s->streams[i];
227 AVIStream *ast = st->priv_data;
228 int n= st->nb_index_entries;
229 int max= ast->sample_size;
230 int64_t pos, size, ts;
231
232 if(n != 1 || ast->sample_size==0)
233 continue;
234
235 while(max < 1024) max+=max;
236
237 pos= st->index_entries[0].pos;
238 size= st->index_entries[0].size;
239 ts= st->index_entries[0].timestamp;
240
241 for(j=0; j<size; j+=max){
242 av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
243 }
244 }
245 }
246
247 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
248 {
249 AVIOContext *pb = s->pb;
250 char key[5] = {0}, *value;
251
252 size += (size & 1);
253
254 if (size == UINT_MAX)
255 return -1;
256 value = av_malloc(size+1);
257 if (!value)
258 return -1;
259 avio_read(pb, value, size);
260 value[size]=0;
261
262 AV_WL32(key, tag);
263
264 return av_metadata_set2(st ? &st->metadata : &s->metadata, key, value,
265 AV_METADATA_DONT_STRDUP_VAL);
266 }
267
268 static void avi_read_info(AVFormatContext *s, uint64_t end)
269 {
270 while (avio_tell(s->pb) < end) {
271 uint32_t tag = avio_rl32(s->pb);
272 uint32_t size = avio_rl32(s->pb);
273 avi_read_tag(s, NULL, tag, size);
274 }
275 }
276
277 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
278 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
279
280 static void avi_metadata_creation_time(AVMetadata **metadata, char *date)
281 {
282 char month[4], time[9], buffer[64];
283 int i, day, year;
284 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
285 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
286 month, &day, time, &year) == 4) {
287 for (i=0; i<12; i++)
288 if (!strcasecmp(month, months[i])) {
289 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
290 year, i+1, day, time);
291 av_metadata_set2(metadata, "creation_time", buffer, 0);
292 }
293 } else if (date[4] == '/' && date[7] == '/') {
294 date[4] = date[7] = '-';
295 av_metadata_set2(metadata, "creation_time", date, 0);
296 }
297 }
298
299 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
300 {
301 while (avio_tell(s->pb) < end) {
302 uint32_t tag = avio_rl32(s->pb);
303 uint32_t size = avio_rl32(s->pb);
304 switch (tag) {
305 case MKTAG('n', 'c', 't', 'g'): { /* Nikon Tags */
306 uint64_t tag_end = avio_tell(s->pb) + size;
307 while (avio_tell(s->pb) < tag_end) {
308 uint16_t tag = avio_rl16(s->pb);
309 uint16_t size = avio_rl16(s->pb);
310 const char *name = NULL;
311 char buffer[64] = {0};
312 size -= avio_read(s->pb, buffer,
313 FFMIN(size, sizeof(buffer)-1));
314 switch (tag) {
315 case 0x03: name = "maker"; break;
316 case 0x04: name = "model"; break;
317 case 0x13: name = "creation_time";
318 if (buffer[4] == ':' && buffer[7] == ':')
319 buffer[4] = buffer[7] = '-';
320 break;
321 }
322 if (name)
323 av_metadata_set2(&s->metadata, name, buffer, 0);
324 avio_skip(s->pb, size);
325 }
326 break;
327 }
328 default:
329 avio_skip(s->pb, size);
330 break;
331 }
332 }
333 }
334
335 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
336 {
337 AVIContext *avi = s->priv_data;
338 AVIOContext *pb = s->pb;
339 unsigned int tag, tag1, handler;
340 int codec_type, stream_index, frame_period, bit_rate;
341 unsigned int size;
342 int i;
343 AVStream *st;
344 AVIStream *ast = NULL;
345 int avih_width=0, avih_height=0;
346 int amv_file_format=0;
347 uint64_t list_end = 0;
348
349 avi->stream_index= -1;
350
351 if (get_riff(s, pb) < 0)
352 return -1;
353
354 avi->fsize = avio_size(pb);
355 if(avi->fsize<=0)
356 avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
357
358 /* first list tag */
359 stream_index = -1;
360 codec_type = -1;
361 frame_period = 0;
362 for(;;) {
363 if (pb->eof_reached)
364 goto fail;
365 tag = avio_rl32(pb);
366 size = avio_rl32(pb);
367
368 print_tag("tag", tag, size);
369
370 switch(tag) {
371 case MKTAG('L', 'I', 'S', 'T'):
372 list_end = avio_tell(pb) + size;
373 /* Ignored, except at start of video packets. */
374 tag1 = avio_rl32(pb);
375
376 print_tag("list", tag1, 0);
377
378 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
379 avi->movi_list = avio_tell(pb) - 4;
380 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
381 else avi->movi_end = avio_size(pb);
382 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
383 goto end_of_header;
384 }
385 else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
386 avi_read_info(s, list_end);
387 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
388 avi_read_nikon(s, list_end);
389
390 break;
391 case MKTAG('I', 'D', 'I', 'T'): {
392 unsigned char date[64] = {0};
393 size += (size & 1);
394 size -= avio_read(pb, date, FFMIN(size, sizeof(date)-1));
395 avio_skip(pb, size);
396 avi_metadata_creation_time(&s->metadata, date);
397 break;
398 }
399 case MKTAG('d', 'm', 'l', 'h'):
400 avi->is_odml = 1;
401 avio_skip(pb, size + (size & 1));
402 break;
403 case MKTAG('a', 'm', 'v', 'h'):
404 amv_file_format=1;
405 case MKTAG('a', 'v', 'i', 'h'):
406 /* AVI header */
407 /* using frame_period is bad idea */
408 frame_period = avio_rl32(pb);
409 bit_rate = avio_rl32(pb) * 8;
410 avio_rl32(pb);
411 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
412
413 avio_skip(pb, 2 * 4);
414 avio_rl32(pb);
415 avio_rl32(pb);
416 avih_width=avio_rl32(pb);
417 avih_height=avio_rl32(pb);
418
419 avio_skip(pb, size - 10 * 4);
420 break;
421 case MKTAG('s', 't', 'r', 'h'):
422 /* stream header */
423
424 tag1 = avio_rl32(pb);
425 handler = avio_rl32(pb); /* codec tag */
426
427 if(tag1 == MKTAG('p', 'a', 'd', 's')){
428 avio_skip(pb, size - 8);
429 break;
430 }else{
431 stream_index++;
432 st = av_new_stream(s, stream_index);
433 if (!st)
434 goto fail;
435
436 ast = av_mallocz(sizeof(AVIStream));
437 if (!ast)
438 goto fail;
439 st->priv_data = ast;
440 }
441 if(amv_file_format)
442 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
443
444 print_tag("strh", tag1, -1);
445
446 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
447 int64_t dv_dur;
448
449 /*
450 * After some consideration -- I don't think we
451 * have to support anything but DV in type1 AVIs.
452 */
453 if (s->nb_streams != 1)
454 goto fail;
455
456 if (handler != MKTAG('d', 'v', 's', 'd') &&
457 handler != MKTAG('d', 'v', 'h', 'd') &&
458 handler != MKTAG('d', 'v', 's', 'l'))
459 goto fail;
460
461 ast = s->streams[0]->priv_data;
462 av_freep(&s->streams[0]->codec->extradata);
463 av_freep(&s->streams[0]->codec);
464 av_freep(&s->streams[0]);
465 s->nb_streams = 0;
466 if (CONFIG_DV_DEMUXER) {
467 avi->dv_demux = dv_init_demux(s);
468 if (!avi->dv_demux)
469 goto fail;
470 }
471 s->streams[0]->priv_data = ast;
472 avio_skip(pb, 3 * 4);
473 ast->scale = avio_rl32(pb);
474 ast->rate = avio_rl32(pb);
475 avio_skip(pb, 4); /* start time */
476
477 dv_dur = avio_rl32(pb);
478 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
479 dv_dur *= AV_TIME_BASE;
480 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
481 }
482 /*
483 * else, leave duration alone; timing estimation in utils.c
484 * will make a guess based on bitrate.
485 */
486
487 stream_index = s->nb_streams - 1;
488 avio_skip(pb, size - 9*4);
489 break;
490 }
491
492 assert(stream_index < s->nb_streams);
493 st->codec->stream_codec_tag= handler;
494
495 avio_rl32(pb); /* flags */
496 avio_rl16(pb); /* priority */
497 avio_rl16(pb); /* language */
498 avio_rl32(pb); /* initial frame */
499 ast->scale = avio_rl32(pb);
500 ast->rate = avio_rl32(pb);
501 if(!(ast->scale && ast->rate)){
502 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);
503 if(frame_period){
504 ast->rate = 1000000;
505 ast->scale = frame_period;
506 }else{
507 ast->rate = 25;
508 ast->scale = 1;
509 }
510 }
511 av_set_pts_info(st, 64, ast->scale, ast->rate);
512
513 ast->cum_len=avio_rl32(pb); /* start */
514 st->nb_frames = avio_rl32(pb);
515
516 st->start_time = 0;
517 avio_rl32(pb); /* buffer size */
518 avio_rl32(pb); /* quality */
519 ast->sample_size = avio_rl32(pb); /* sample ssize */
520 ast->cum_len *= FFMAX(1, ast->sample_size);
521 // av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
522
523 switch(tag1) {
524 case MKTAG('v', 'i', 'd', 's'):
525 codec_type = AVMEDIA_TYPE_VIDEO;
526
527 ast->sample_size = 0;
528 break;
529 case MKTAG('a', 'u', 'd', 's'):
530 codec_type = AVMEDIA_TYPE_AUDIO;
531 break;
532 case MKTAG('t', 'x', 't', 's'):
533 codec_type = AVMEDIA_TYPE_SUBTITLE;
534 break;
535 case MKTAG('d', 'a', 't', 's'):
536 codec_type = AVMEDIA_TYPE_DATA;
537 break;
538 default:
539 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
540 goto fail;
541 }
542 if(ast->sample_size == 0)
543 st->duration = st->nb_frames;
544 ast->frame_offset= ast->cum_len;
545 avio_skip(pb, size - 12 * 4);
546 break;
547 case MKTAG('s', 't', 'r', 'f'):
548 /* stream header */
549 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
550 avio_skip(pb, size);
551 } else {
552 uint64_t cur_pos = avio_tell(pb);
553 if (cur_pos < list_end)
554 size = FFMIN(size, list_end - cur_pos);
555 st = s->streams[stream_index];
556 switch(codec_type) {
557 case AVMEDIA_TYPE_VIDEO:
558 if(amv_file_format){
559 st->codec->width=avih_width;
560 st->codec->height=avih_height;
561 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
562 st->codec->codec_id = CODEC_ID_AMV;
563 avio_skip(pb, size);
564 break;
565 }
566 tag1 = ff_get_bmp_header(pb, st);
567
568 if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
569 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
570 st->codec->codec_tag = tag1;
571 st->codec->codec_id = CODEC_ID_XSUB;
572 break;
573 }
574
575 if(size > 10*4 && size<(1<<30)){
576 st->codec->extradata_size= size - 10*4;
577 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
578 if (!st->codec->extradata) {
579 st->codec->extradata_size= 0;
580 return AVERROR(ENOMEM);
581 }
582 avio_read(pb, st->codec->extradata, st->codec->extradata_size);
583 }
584
585 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
586 avio_r8(pb);
587
588 /* Extract palette from extradata if bpp <= 8. */
589 /* This code assumes that extradata contains only palette. */
590 /* This is true for all paletted codecs implemented in FFmpeg. */
591 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
592 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
593 #if HAVE_BIGENDIAN
594 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
595 st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
596 #else
597 memcpy(st->codec->palctrl->palette, st->codec->extradata,
598 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
599 #endif
600 st->codec->palctrl->palette_changed = 1;
601 }
602
603 print_tag("video", tag1, 0);
604
605 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
606 st->codec->codec_tag = tag1;
607 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
608 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
609 // Support "Resolution 1:1" for Avid AVI Codec
610 if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
611 st->codec->extradata_size >= 31 &&
612 !memcmp(&st->codec->extradata[28], "1:1", 3))
613 st->codec->codec_id = CODEC_ID_RAWVIDEO;
614
615 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
616 st->codec->extradata_size+= 9;
617 st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
618 if(st->codec->extradata)
619 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
620 }
621 st->codec->height= FFABS(st->codec->height);
622
623 // avio_skip(pb, size - 5 * 4);
624 break;
625 case AVMEDIA_TYPE_AUDIO:
626 ff_get_wav_header(pb, st->codec, size);
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 == 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 = CODEC_ID_XAN_DPCM;
646 st->codec->codec_tag = 0;
647 }
648 if (amv_file_format){
649 st->codec->codec_id = 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 = CODEC_ID_PROBE;
656 break;
657 default:
658 st->codec->codec_type = AVMEDIA_TYPE_DATA;
659 st->codec->codec_id= 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);
670 }
671 avio_seek(pb, i+size, SEEK_SET);
672 break;
673 case MKTAG('v', 'p', 'r', 'p'):
674 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
675 AVRational active, active_aspect;
676
677 st = s->streams[stream_index];
678 avio_rl32(pb);
679 avio_rl32(pb);
680 avio_rl32(pb);
681 avio_rl32(pb);
682 avio_rl32(pb);
683
684 active_aspect.den= avio_rl16(pb);
685 active_aspect.num= avio_rl16(pb);
686 active.num = avio_rl32(pb);
687 active.den = avio_rl32(pb);
688 avio_rl32(pb); //nbFieldsPerFrame
689
690 if(active_aspect.num && active_aspect.den && active.num && active.den){
691 st->sample_aspect_ratio= av_div_q(active_aspect, active);
692 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
693 }
694 size -= 9*4;
695 }
696 avio_skip(pb, size);
697 break;
698 case MKTAG('s', 't', 'r', 'n'):
699 if(s->nb_streams){
700 avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
701 break;
702 }
703 default:
704 if(size > 1000000){
705 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
706 "I will ignore it and try to continue anyway.\n");
707 avi->movi_list = avio_tell(pb) - 4;
708 avi->movi_end = avio_size(pb);
709 goto end_of_header;
710 }
711 /* skip tag */
712 size += (size & 1);
713 avio_skip(pb, size);
714 break;
715 }
716 }
717 end_of_header:
718 /* check stream number */
719 if (stream_index != s->nb_streams - 1) {
720 fail:
721 return -1;
722 }
723
724 if(!avi->index_loaded && pb->seekable)
725 avi_load_index(s);
726 avi->index_loaded = 1;
727 avi->non_interleaved |= guess_ni_flag(s);
728 for(i=0; i<s->nb_streams; i++){
729 AVStream *st = s->streams[i];
730 if(st->nb_index_entries)
731 break;
732 }
733 if(i==s->nb_streams && avi->non_interleaved) {
734 av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
735 avi->non_interleaved=0;
736 }
737
738 if(avi->non_interleaved) {
739 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
740 clean_index(s);
741 }
742
743 ff_metadata_conv_ctx(s, NULL, ff_avi_metadata_conv);
744
745 return 0;
746 }
747
748 static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
749 if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
750 uint8_t desc[256];
751 int score = AVPROBE_SCORE_MAX / 2, ret;
752 AVIStream *ast = st->priv_data;
753 AVInputFormat *sub_demuxer;
754 AVRational time_base;
755 AVIOContext *pb = avio_alloc_context( pkt->data + 7,
756 pkt->size - 7,
757 0, NULL, NULL, NULL, NULL);
758 AVProbeData pd;
759 unsigned int desc_len = avio_rl32(pb);
760
761 if (desc_len > pb->buf_end - pb->buf_ptr)
762 goto error;
763
764 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
765 avio_skip(pb, desc_len - ret);
766 if (*desc)
767 av_metadata_set2(&st->metadata, "title", desc, 0);
768
769 avio_rl16(pb); /* flags? */
770 avio_rl32(pb); /* data size */
771
772 pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr };
773 if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
774 goto error;
775
776 if (!av_open_input_stream(&ast->sub_ctx, pb, "", sub_demuxer, NULL)) {
777 av_read_packet(ast->sub_ctx, &ast->sub_pkt);
778 *st->codec = *ast->sub_ctx->streams[0]->codec;
779 ast->sub_ctx->streams[0]->codec->extradata = NULL;
780 time_base = ast->sub_ctx->streams[0]->time_base;
781 av_set_pts_info(st, 64, time_base.num, time_base.den);
782 }
783 ast->sub_buffer = pkt->data;
784 memset(pkt, 0, sizeof(*pkt));
785 return 1;
786 error:
787 av_freep(&pb);
788 }
789 return 0;
790 }
791
792 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
793 AVPacket *pkt)
794 {
795 AVIStream *ast, *next_ast = next_st->priv_data;
796 int64_t ts, next_ts, ts_min = INT64_MAX;
797 AVStream *st, *sub_st = NULL;
798 int i;
799
800 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
801 AV_TIME_BASE_Q);
802
803 for (i=0; i<s->nb_streams; i++) {
804 st = s->streams[i];
805 ast = st->priv_data;
806 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
807 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
808 if (ts <= next_ts && ts < ts_min) {
809 ts_min = ts;
810 sub_st = st;
811 }
812 }
813 }
814
815 if (sub_st) {
816 ast = sub_st->priv_data;
817 *pkt = ast->sub_pkt;
818 pkt->stream_index = sub_st->index;
819 if (av_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
820 ast->sub_pkt.data = NULL;
821 }
822 return sub_st;
823 }
824
825 static int get_stream_idx(int *d){
826 if( d[0] >= '0' && d[0] <= '9'
827 && d[1] >= '0' && d[1] <= '9'){
828 return (d[0] - '0') * 10 + (d[1] - '0');
829 }else{
830 return 100; //invalid stream ID
831 }
832 }
833
834 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
835 {
836 AVIContext *avi = s->priv_data;
837 AVIOContext *pb = s->pb;
838 int n, d[8];
839 unsigned int size;
840 int64_t i, sync;
841 void* dstr;
842
843 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
844 int size = dv_get_packet(avi->dv_demux, pkt);
845 if (size >= 0)
846 return size;
847 }
848
849 if(avi->non_interleaved){
850 int best_stream_index = 0;
851 AVStream *best_st= NULL;
852 AVIStream *best_ast;
853 int64_t best_ts= INT64_MAX;
854 int i;
855
856 for(i=0; i<s->nb_streams; i++){
857 AVStream *st = s->streams[i];
858 AVIStream *ast = st->priv_data;
859 int64_t ts= ast->frame_offset;
860 int64_t last_ts;
861
862 if(!st->nb_index_entries)
863 continue;
864
865 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
866 if(!ast->remaining && ts > last_ts)
867 continue;
868
869 ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
870
871 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
872 if(ts < best_ts){
873 best_ts= ts;
874 best_st= st;
875 best_stream_index= i;
876 }
877 }
878 if(!best_st)
879 return -1;
880
881 best_ast = best_st->priv_data;
882 best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
883 if(best_ast->remaining)
884 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
885 else{
886 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
887 if(i>=0)
888 best_ast->frame_offset= best_st->index_entries[i].timestamp;
889 }
890
891 // av_log(s, AV_LOG_DEBUG, "%d\n", i);
892 if(i>=0){
893 int64_t pos= best_st->index_entries[i].pos;
894 pos += best_ast->packet_size - best_ast->remaining;
895 avio_seek(s->pb, pos + 8, SEEK_SET);
896 // av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
897
898 assert(best_ast->remaining <= best_ast->packet_size);
899
900 avi->stream_index= best_stream_index;
901 if(!best_ast->remaining)
902 best_ast->packet_size=
903 best_ast->remaining= best_st->index_entries[i].size;
904 }
905 }
906
907 resync:
908 if(avi->stream_index >= 0){
909 AVStream *st= s->streams[ avi->stream_index ];
910 AVIStream *ast= st->priv_data;
911 int size, err;
912
913 if(get_subtitle_pkt(s, st, pkt))
914 return 0;
915
916 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
917 size= INT_MAX;
918 else if(ast->sample_size < 32)
919 // arbitrary multiplier to avoid tiny packets for raw PCM data
920 size= 1024*ast->sample_size;
921 else
922 size= ast->sample_size;
923
924 if(size > ast->remaining)
925 size= ast->remaining;
926 avi->last_pkt_pos= avio_tell(pb);
927 err= av_get_packet(pb, pkt, size);
928 if(err<0)
929 return err;
930
931 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
932 void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
933 if(ptr){
934 ast->has_pal=0;
935 pkt->size += 4*256;
936 pkt->data= ptr;
937 memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
938 }else
939 av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
940 }
941
942 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
943 dstr = pkt->destruct;
944 size = dv_produce_packet(avi->dv_demux, pkt,
945 pkt->data, pkt->size);
946 pkt->destruct = dstr;
947 pkt->flags |= AV_PKT_FLAG_KEY;
948 if (size < 0)
949 av_free_packet(pkt);
950 } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
951 && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
952 ast->frame_offset++;
953 avi->stream_index = -1;
954 ast->remaining = 0;
955 goto resync;
956 } else {
957 /* XXX: How to handle B-frames in AVI? */
958 pkt->dts = ast->frame_offset;
959 // pkt->dts += ast->start;
960 if(ast->sample_size)
961 pkt->dts /= ast->sample_size;
962 //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);
963 pkt->stream_index = avi->stream_index;
964
965 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
966 AVIndexEntry *e;
967 int index;
968 assert(st->index_entries);
969
970 index= av_index_search_timestamp(st, ast->frame_offset, 0);
971 e= &st->index_entries[index];
972
973 if(index >= 0 && e->timestamp == ast->frame_offset){
974 if (e->flags & AVINDEX_KEYFRAME)
975 pkt->flags |= AV_PKT_FLAG_KEY;
976 }
977 } else {
978 pkt->flags |= AV_PKT_FLAG_KEY;
979 }
980 ast->frame_offset += get_duration(ast, pkt->size);
981 }
982 ast->remaining -= size;
983 if(!ast->remaining){
984 avi->stream_index= -1;
985 ast->packet_size= 0;
986 }
987
988 return size;
989 }
990
991 memset(d, -1, sizeof(int)*8);
992 for(i=sync=avio_tell(pb); !pb->eof_reached; i++) {
993 int j;
994
995 for(j=0; j<7; j++)
996 d[j]= d[j+1];
997 d[7]= avio_r8(pb);
998
999 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
1000
1001 n= get_stream_idx(d+2);
1002 //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);
1003 if(i + (uint64_t)size > avi->fsize || d[0]<0)
1004 continue;
1005
1006 //parse ix##
1007 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
1008 //parse JUNK
1009 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
1010 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
1011 avio_skip(pb, size);
1012 //av_log(s, AV_LOG_DEBUG, "SKIP\n");
1013 goto resync;
1014 }
1015
1016 //parse stray LIST
1017 if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
1018 avio_skip(pb, 4);
1019 goto resync;
1020 }
1021
1022 n= get_stream_idx(d);
1023
1024 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
1025 continue;
1026
1027 //detect ##ix chunk and skip
1028 if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
1029 avio_skip(pb, size);
1030 goto resync;
1031 }
1032
1033 //parse ##dc/##wb
1034 if(n < s->nb_streams){
1035 AVStream *st;
1036 AVIStream *ast;
1037 st = s->streams[n];
1038 ast = st->priv_data;
1039
1040 if(s->nb_streams>=2){
1041 AVStream *st1 = s->streams[1];
1042 AVIStream *ast1= st1->priv_data;
1043 //workaround for broken small-file-bug402.avi
1044 if( d[2] == 'w' && d[3] == 'b'
1045 && n==0
1046 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1047 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1048 && ast->prefix == 'd'*256+'c'
1049 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1050 ){
1051 n=1;
1052 st = st1;
1053 ast = ast1;
1054 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
1055 }
1056 }
1057
1058
1059 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
1060 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
1061 || st->discard >= AVDISCARD_ALL){
1062 ast->frame_offset += get_duration(ast, size);
1063 avio_skip(pb, size);
1064 goto resync;
1065 }
1066
1067 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
1068 int k = avio_r8(pb);
1069 int last = (k + avio_r8(pb) - 1) & 0xFF;
1070
1071 avio_rl16(pb); //flags
1072
1073 for (; k <= last; k++)
1074 ast->pal[k] = avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);
1075 ast->has_pal= 1;
1076 goto resync;
1077 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
1078 d[2]*256+d[3] == ast->prefix /*||
1079 (d[2] == 'd' && d[3] == 'c') ||
1080 (d[2] == 'w' && d[3] == 'b')*/) {
1081
1082 //av_log(s, AV_LOG_DEBUG, "OK\n");
1083 if(d[2]*256+d[3] == ast->prefix)
1084 ast->prefix_count++;
1085 else{
1086 ast->prefix= d[2]*256+d[3];
1087 ast->prefix_count= 0;
1088 }
1089
1090 avi->stream_index= n;
1091 ast->packet_size= size + 8;
1092 ast->remaining= size;
1093
1094 if(size || !ast->sample_size){
1095 uint64_t pos= avio_tell(pb) - 8;
1096 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
1097 av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
1098 }
1099 }
1100 goto resync;
1101 }
1102 }
1103 }
1104
1105 return AVERROR_EOF;
1106 }
1107
1108 /* XXX: We make the implicit supposition that the positions are sorted
1109 for each stream. */
1110 static int avi_read_idx1(AVFormatContext *s, int size)
1111 {
1112 AVIContext *avi = s->priv_data;
1113 AVIOContext *pb = s->pb;
1114 int nb_index_entries, i;
1115 AVStream *st;
1116 AVIStream *ast;
1117 unsigned int index, tag, flags, pos, len;
1118 unsigned last_pos= -1;
1119
1120 nb_index_entries = size / 16;
1121 if (nb_index_entries <= 0)
1122 return -1;
1123
1124 /* Read the entries and sort them in each stream component. */
1125 for(i = 0; i < nb_index_entries; i++) {
1126 tag = avio_rl32(pb);
1127 flags = avio_rl32(pb);
1128 pos = avio_rl32(pb);
1129 len = avio_rl32(pb);
1130 #if defined(DEBUG_SEEK)
1131 av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1132 i, tag, flags, pos, len);
1133 #endif
1134 if(i==0 && pos > avi->movi_list)
1135 avi->movi_list= 0; //FIXME better check
1136 pos += avi->movi_list;
1137
1138 index = ((tag & 0xff) - '0') * 10;
1139 index += ((tag >> 8) & 0xff) - '0';
1140 if (index >= s->nb_streams)
1141 continue;
1142 st = s->streams[index];
1143 ast = st->priv_data;
1144
1145 #if defined(DEBUG_SEEK)
1146 av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1147 #endif
1148 if(pb->eof_reached)
1149 return -1;
1150
1151 if(last_pos == pos)
1152 avi->non_interleaved= 1;
1153 else if(len || !ast->sample_size)
1154 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1155 ast->cum_len += get_duration(ast, len);
1156 last_pos= pos;
1157 }
1158 return 0;
1159 }
1160
1161 static int guess_ni_flag(AVFormatContext *s){
1162 int i;
1163 int64_t last_start=0;
1164 int64_t first_end= INT64_MAX;
1165 int64_t oldpos= avio_tell(s->pb);
1166
1167 for(i=0; i<s->nb_streams; i++){
1168 AVStream *st = s->streams[i];
1169 int n= st->nb_index_entries;
1170 unsigned int size;
1171
1172 if(n <= 0)
1173 continue;
1174
1175 if(n >= 2){
1176 int64_t pos= st->index_entries[0].pos;
1177 avio_seek(s->pb, pos + 4, SEEK_SET);
1178 size= avio_rl32(s->pb);
1179 if(pos + size > st->index_entries[1].pos)
1180 last_start= INT64_MAX;
1181 }
1182
1183 if(st->index_entries[0].pos > last_start)
1184 last_start= st->index_entries[0].pos;
1185 if(st->index_entries[n-1].pos < first_end)
1186 first_end= st->index_entries[n-1].pos;
1187 }
1188 avio_seek(s->pb, oldpos, SEEK_SET);
1189 return last_start > first_end;
1190 }
1191
1192 static int avi_load_index(AVFormatContext *s)
1193 {
1194 AVIContext *avi = s->priv_data;
1195 AVIOContext *pb = s->pb;
1196 uint32_t tag, size;
1197 int64_t pos= avio_tell(pb);
1198 int ret = -1;
1199
1200 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1201 goto the_end; // maybe truncated file
1202 #ifdef DEBUG_SEEK
1203 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1204 #endif
1205 for(;;) {
1206 if (pb->eof_reached)
1207 break;
1208 tag = avio_rl32(pb);
1209 size = avio_rl32(pb);
1210 #ifdef DEBUG_SEEK
1211 printf("tag=%c%c%c%c size=0x%x\n",
1212 tag & 0xff,
1213 (tag >> 8) & 0xff,
1214 (tag >> 16) & 0xff,
1215 (tag >> 24) & 0xff,
1216 size);
1217 #endif
1218 switch(tag) {
1219 case MKTAG('i', 'd', 'x', '1'):
1220 if (avi_read_idx1(s, size) < 0)
1221 goto skip;
1222 ret = 0;
1223 goto the_end;
1224 break;
1225 default:
1226 skip:
1227 size += (size & 1);
1228 if (avio_skip(pb, size) < 0)
1229 goto the_end; // something is wrong here
1230 break;
1231 }
1232 }
1233 the_end:
1234 avio_seek(pb, pos, SEEK_SET);
1235 return ret;
1236 }
1237
1238 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1239 {
1240 AVIStream *ast2 = st2->priv_data;
1241 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1242 av_free_packet(&ast2->sub_pkt);
1243 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1244 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1245 av_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1246 }
1247
1248 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1249 {
1250 AVIContext *avi = s->priv_data;
1251 AVStream *st;
1252 int i, index;
1253 int64_t pos;
1254 AVIStream *ast;
1255
1256 if (!avi->index_loaded) {
1257 /* we only load the index on demand */
1258 avi_load_index(s);
1259 avi->index_loaded = 1;
1260 }
1261 assert(stream_index>= 0);
1262
1263 st = s->streams[stream_index];
1264 ast= st->priv_data;
1265 index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1266 if(index<0)
1267 return -1;
1268
1269 /* find the position */
1270 pos = st->index_entries[index].pos;
1271 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1272
1273 // av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1274
1275 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1276 /* One and only one real stream for DV in AVI, and it has video */
1277 /* offsets. Calling with other stream indexes should have failed */
1278 /* the av_index_search_timestamp call above. */
1279 assert(stream_index == 0);
1280
1281 /* Feed the DV video stream version of the timestamp to the */
1282 /* DV demux so it can synthesize correct timestamps. */
1283 dv_offset_reset(avi->dv_demux, timestamp);
1284
1285 avio_seek(s->pb, pos, SEEK_SET);
1286 avi->stream_index= -1;
1287 return 0;
1288 }
1289
1290 for(i = 0; i < s->nb_streams; i++) {
1291 AVStream *st2 = s->streams[i];
1292 AVIStream *ast2 = st2->priv_data;
1293
1294 ast2->packet_size=
1295 ast2->remaining= 0;
1296
1297 if (ast2->sub_ctx) {
1298 seek_subtitle(st, st2, timestamp);
1299 continue;
1300 }
1301
1302 if (st2->nb_index_entries <= 0)
1303 continue;
1304
1305 // assert(st2->codec->block_align);
1306 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1307 index = av_index_search_timestamp(
1308 st2,
1309 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1310 flags | AVSEEK_FLAG_BACKWARD);
1311 if(index<0)
1312 index=0;
1313
1314 if(!avi->non_interleaved){
1315 while(index>0 && st2->index_entries[index].pos > pos)
1316 index--;
1317 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1318 index++;
1319 }
1320
1321 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1322 /* extract the current frame number */
1323 ast2->frame_offset = st2->index_entries[index].timestamp;
1324 }
1325
1326 /* do the seek */
1327 avio_seek(s->pb, pos, SEEK_SET);
1328 avi->stream_index= -1;
1329 return 0;
1330 }
1331
1332 static int avi_read_close(AVFormatContext *s)
1333 {
1334 int i;
1335 AVIContext *avi = s->priv_data;
1336
1337 for(i=0;i<s->nb_streams;i++) {
1338 AVStream *st = s->streams[i];
1339 AVIStream *ast = st->priv_data;
1340 av_free(st->codec->palctrl);
1341 if (ast) {
1342 if (ast->sub_ctx) {
1343 av_freep(&ast->sub_ctx->pb);
1344 av_close_input_stream(ast->sub_ctx);
1345 }
1346 av_free(ast->sub_buffer);
1347 av_free_packet(&ast->sub_pkt);
1348 }
1349 }
1350
1351 av_free(avi->dv_demux);
1352
1353 return 0;
1354 }
1355
1356 static int avi_probe(AVProbeData *p)
1357 {
1358 int i;
1359
1360 /* check file header */
1361 for(i=0; avi_headers[i][0]; i++)
1362 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1363 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1364 return AVPROBE_SCORE_MAX;
1365
1366 return 0;
1367 }
1368
1369 AVInputFormat ff_avi_demuxer = {
1370 "avi",
1371 NULL_IF_CONFIG_SMALL("AVI format"),
1372 sizeof(AVIContext),
1373 avi_probe,
1374 avi_read_header,
1375 avi_read_packet,
1376 avi_read_close,
1377 avi_read_seek,
1378 };