handle malloc failures in ff_get_wav_header
[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 int ret;
349
350 avi->stream_index= -1;
351
352 if (get_riff(s, pb) < 0)
353 return -1;
354
355 avi->fsize = avio_size(pb);
356 if(avi->fsize<=0)
357 avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
358
359 /* first list tag */
360 stream_index = -1;
361 codec_type = -1;
362 frame_period = 0;
363 for(;;) {
364 if (pb->eof_reached)
365 goto fail;
366 tag = avio_rl32(pb);
367 size = avio_rl32(pb);
368
369 print_tag("tag", tag, size);
370
371 switch(tag) {
372 case MKTAG('L', 'I', 'S', 'T'):
373 list_end = avio_tell(pb) + size;
374 /* Ignored, except at start of video packets. */
375 tag1 = avio_rl32(pb);
376
377 print_tag("list", tag1, 0);
378
379 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
380 avi->movi_list = avio_tell(pb) - 4;
381 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
382 else avi->movi_end = avio_size(pb);
383 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
384 goto end_of_header;
385 }
386 else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
387 avi_read_info(s, list_end);
388 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
389 avi_read_nikon(s, list_end);
390
391 break;
392 case MKTAG('I', 'D', 'I', 'T'): {
393 unsigned char date[64] = {0};
394 size += (size & 1);
395 size -= avio_read(pb, date, FFMIN(size, sizeof(date)-1));
396 avio_skip(pb, size);
397 avi_metadata_creation_time(&s->metadata, date);
398 break;
399 }
400 case MKTAG('d', 'm', 'l', 'h'):
401 avi->is_odml = 1;
402 avio_skip(pb, size + (size & 1));
403 break;
404 case MKTAG('a', 'm', 'v', 'h'):
405 amv_file_format=1;
406 case MKTAG('a', 'v', 'i', 'h'):
407 /* AVI header */
408 /* using frame_period is bad idea */
409 frame_period = avio_rl32(pb);
410 bit_rate = avio_rl32(pb) * 8;
411 avio_rl32(pb);
412 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
413
414 avio_skip(pb, 2 * 4);
415 avio_rl32(pb);
416 avio_rl32(pb);
417 avih_width=avio_rl32(pb);
418 avih_height=avio_rl32(pb);
419
420 avio_skip(pb, size - 10 * 4);
421 break;
422 case MKTAG('s', 't', 'r', 'h'):
423 /* stream header */
424
425 tag1 = avio_rl32(pb);
426 handler = avio_rl32(pb); /* codec tag */
427
428 if(tag1 == MKTAG('p', 'a', 'd', 's')){
429 avio_skip(pb, size - 8);
430 break;
431 }else{
432 stream_index++;
433 st = av_new_stream(s, stream_index);
434 if (!st)
435 goto fail;
436
437 ast = av_mallocz(sizeof(AVIStream));
438 if (!ast)
439 goto fail;
440 st->priv_data = ast;
441 }
442 if(amv_file_format)
443 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
444
445 print_tag("strh", tag1, -1);
446
447 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
448 int64_t dv_dur;
449
450 /*
451 * After some consideration -- I don't think we
452 * have to support anything but DV in type1 AVIs.
453 */
454 if (s->nb_streams != 1)
455 goto fail;
456
457 if (handler != MKTAG('d', 'v', 's', 'd') &&
458 handler != MKTAG('d', 'v', 'h', 'd') &&
459 handler != MKTAG('d', 'v', 's', 'l'))
460 goto fail;
461
462 ast = s->streams[0]->priv_data;
463 av_freep(&s->streams[0]->codec->extradata);
464 av_freep(&s->streams[0]->codec);
465 av_freep(&s->streams[0]);
466 s->nb_streams = 0;
467 if (CONFIG_DV_DEMUXER) {
468 avi->dv_demux = dv_init_demux(s);
469 if (!avi->dv_demux)
470 goto fail;
471 }
472 s->streams[0]->priv_data = ast;
473 avio_skip(pb, 3 * 4);
474 ast->scale = avio_rl32(pb);
475 ast->rate = avio_rl32(pb);
476 avio_skip(pb, 4); /* start time */
477
478 dv_dur = avio_rl32(pb);
479 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
480 dv_dur *= AV_TIME_BASE;
481 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
482 }
483 /*
484 * else, leave duration alone; timing estimation in utils.c
485 * will make a guess based on bitrate.
486 */
487
488 stream_index = s->nb_streams - 1;
489 avio_skip(pb, size - 9*4);
490 break;
491 }
492
493 assert(stream_index < s->nb_streams);
494 st->codec->stream_codec_tag= handler;
495
496 avio_rl32(pb); /* flags */
497 avio_rl16(pb); /* priority */
498 avio_rl16(pb); /* language */
499 avio_rl32(pb); /* initial frame */
500 ast->scale = avio_rl32(pb);
501 ast->rate = avio_rl32(pb);
502 if(!(ast->scale && ast->rate)){
503 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);
504 if(frame_period){
505 ast->rate = 1000000;
506 ast->scale = frame_period;
507 }else{
508 ast->rate = 25;
509 ast->scale = 1;
510 }
511 }
512 av_set_pts_info(st, 64, ast->scale, ast->rate);
513
514 ast->cum_len=avio_rl32(pb); /* start */
515 st->nb_frames = avio_rl32(pb);
516
517 st->start_time = 0;
518 avio_rl32(pb); /* buffer size */
519 avio_rl32(pb); /* quality */
520 ast->sample_size = avio_rl32(pb); /* sample ssize */
521 ast->cum_len *= FFMAX(1, ast->sample_size);
522 // av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
523
524 switch(tag1) {
525 case MKTAG('v', 'i', 'd', 's'):
526 codec_type = AVMEDIA_TYPE_VIDEO;
527
528 ast->sample_size = 0;
529 break;
530 case MKTAG('a', 'u', 'd', 's'):
531 codec_type = AVMEDIA_TYPE_AUDIO;
532 break;
533 case MKTAG('t', 'x', 't', 's'):
534 codec_type = AVMEDIA_TYPE_SUBTITLE;
535 break;
536 case MKTAG('d', 'a', 't', 's'):
537 codec_type = AVMEDIA_TYPE_DATA;
538 break;
539 default:
540 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
541 goto fail;
542 }
543 if(ast->sample_size == 0)
544 st->duration = st->nb_frames;
545 ast->frame_offset= ast->cum_len;
546 avio_skip(pb, size - 12 * 4);
547 break;
548 case MKTAG('s', 't', 'r', 'f'):
549 /* stream header */
550 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
551 avio_skip(pb, size);
552 } else {
553 uint64_t cur_pos = avio_tell(pb);
554 if (cur_pos < list_end)
555 size = FFMIN(size, list_end - cur_pos);
556 st = s->streams[stream_index];
557 switch(codec_type) {
558 case AVMEDIA_TYPE_VIDEO:
559 if(amv_file_format){
560 st->codec->width=avih_width;
561 st->codec->height=avih_height;
562 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
563 st->codec->codec_id = CODEC_ID_AMV;
564 avio_skip(pb, size);
565 break;
566 }
567 tag1 = ff_get_bmp_header(pb, st);
568
569 if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
570 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
571 st->codec->codec_tag = tag1;
572 st->codec->codec_id = CODEC_ID_XSUB;
573 break;
574 }
575
576 if(size > 10*4 && size<(1<<30)){
577 st->codec->extradata_size= size - 10*4;
578 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
579 if (!st->codec->extradata) {
580 st->codec->extradata_size= 0;
581 return AVERROR(ENOMEM);
582 }
583 avio_read(pb, st->codec->extradata, st->codec->extradata_size);
584 }
585
586 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
587 avio_r8(pb);
588
589 /* Extract palette from extradata if bpp <= 8. */
590 /* This code assumes that extradata contains only palette. */
591 /* This is true for all paletted codecs implemented in FFmpeg. */
592 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
593 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
594 #if HAVE_BIGENDIAN
595 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
596 st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
597 #else
598 memcpy(st->codec->palctrl->palette, st->codec->extradata,
599 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
600 #endif
601 st->codec->palctrl->palette_changed = 1;
602 }
603
604 print_tag("video", tag1, 0);
605
606 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
607 st->codec->codec_tag = tag1;
608 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
609 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
610 // Support "Resolution 1:1" for Avid AVI Codec
611 if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
612 st->codec->extradata_size >= 31 &&
613 !memcmp(&st->codec->extradata[28], "1:1", 3))
614 st->codec->codec_id = CODEC_ID_RAWVIDEO;
615
616 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
617 st->codec->extradata_size+= 9;
618 st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
619 if(st->codec->extradata)
620 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
621 }
622 st->codec->height= FFABS(st->codec->height);
623
624 // avio_skip(pb, size - 5 * 4);
625 break;
626 case AVMEDIA_TYPE_AUDIO:
627 ret = ff_get_wav_header(pb, st->codec, size);
628 if (ret < 0)
629 return ret;
630 ast->dshow_block_align= st->codec->block_align;
631 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
632 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
633 ast->sample_size= st->codec->block_align;
634 }
635 if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
636 avio_skip(pb, 1);
637 /* Force parsing as several audio frames can be in
638 * one packet and timestamps refer to packet start. */
639 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
640 /* ADTS header is in extradata, AAC without header must be
641 * stored as exact frames. Parser not needed and it will
642 * fail. */
643 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
644 st->need_parsing = AVSTREAM_PARSE_NONE;
645 /* AVI files with Xan DPCM audio (wrongly) declare PCM
646 * audio in the header but have Axan as stream_code_tag. */
647 if (st->codec->stream_codec_tag == AV_RL32("Axan")){
648 st->codec->codec_id = CODEC_ID_XAN_DPCM;
649 st->codec->codec_tag = 0;
650 }
651 if (amv_file_format){
652 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
653 ast->dshow_block_align = 0;
654 }
655 break;
656 case AVMEDIA_TYPE_SUBTITLE:
657 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
658 st->codec->codec_id = CODEC_ID_PROBE;
659 break;
660 default:
661 st->codec->codec_type = AVMEDIA_TYPE_DATA;
662 st->codec->codec_id= CODEC_ID_NONE;
663 st->codec->codec_tag= 0;
664 avio_skip(pb, size);
665 break;
666 }
667 }
668 break;
669 case MKTAG('i', 'n', 'd', 'x'):
670 i= avio_tell(pb);
671 if(pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX)){
672 read_braindead_odml_indx(s, 0);
673 }
674 avio_seek(pb, i+size, SEEK_SET);
675 break;
676 case MKTAG('v', 'p', 'r', 'p'):
677 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
678 AVRational active, active_aspect;
679
680 st = s->streams[stream_index];
681 avio_rl32(pb);
682 avio_rl32(pb);
683 avio_rl32(pb);
684 avio_rl32(pb);
685 avio_rl32(pb);
686
687 active_aspect.den= avio_rl16(pb);
688 active_aspect.num= avio_rl16(pb);
689 active.num = avio_rl32(pb);
690 active.den = avio_rl32(pb);
691 avio_rl32(pb); //nbFieldsPerFrame
692
693 if(active_aspect.num && active_aspect.den && active.num && active.den){
694 st->sample_aspect_ratio= av_div_q(active_aspect, active);
695 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
696 }
697 size -= 9*4;
698 }
699 avio_skip(pb, size);
700 break;
701 case MKTAG('s', 't', 'r', 'n'):
702 if(s->nb_streams){
703 avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
704 break;
705 }
706 default:
707 if(size > 1000000){
708 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
709 "I will ignore it and try to continue anyway.\n");
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, ff_avi_metadata_conv);
747
748 return 0;
749 }
750
751 static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
752 if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
753 uint8_t desc[256];
754 int score = AVPROBE_SCORE_MAX / 2, ret;
755 AVIStream *ast = st->priv_data;
756 AVInputFormat *sub_demuxer;
757 AVRational time_base;
758 AVIOContext *pb = avio_alloc_context( pkt->data + 7,
759 pkt->size - 7,
760 0, NULL, NULL, NULL, NULL);
761 AVProbeData pd;
762 unsigned int desc_len = avio_rl32(pb);
763
764 if (desc_len > pb->buf_end - pb->buf_ptr)
765 goto error;
766
767 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
768 avio_skip(pb, desc_len - ret);
769 if (*desc)
770 av_metadata_set2(&st->metadata, "title", desc, 0);
771
772 avio_rl16(pb); /* flags? */
773 avio_rl32(pb); /* data size */
774
775 pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr };
776 if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
777 goto error;
778
779 if (!av_open_input_stream(&ast->sub_ctx, pb, "", sub_demuxer, NULL)) {
780 av_read_packet(ast->sub_ctx, &ast->sub_pkt);
781 *st->codec = *ast->sub_ctx->streams[0]->codec;
782 ast->sub_ctx->streams[0]->codec->extradata = NULL;
783 time_base = ast->sub_ctx->streams[0]->time_base;
784 av_set_pts_info(st, 64, time_base.num, time_base.den);
785 }
786 ast->sub_buffer = pkt->data;
787 memset(pkt, 0, sizeof(*pkt));
788 return 1;
789 error:
790 av_freep(&pb);
791 }
792 return 0;
793 }
794
795 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
796 AVPacket *pkt)
797 {
798 AVIStream *ast, *next_ast = next_st->priv_data;
799 int64_t ts, next_ts, ts_min = INT64_MAX;
800 AVStream *st, *sub_st = NULL;
801 int i;
802
803 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
804 AV_TIME_BASE_Q);
805
806 for (i=0; i<s->nb_streams; i++) {
807 st = s->streams[i];
808 ast = st->priv_data;
809 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
810 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
811 if (ts <= next_ts && ts < ts_min) {
812 ts_min = ts;
813 sub_st = st;
814 }
815 }
816 }
817
818 if (sub_st) {
819 ast = sub_st->priv_data;
820 *pkt = ast->sub_pkt;
821 pkt->stream_index = sub_st->index;
822 if (av_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
823 ast->sub_pkt.data = NULL;
824 }
825 return sub_st;
826 }
827
828 static int get_stream_idx(int *d){
829 if( d[0] >= '0' && d[0] <= '9'
830 && d[1] >= '0' && d[1] <= '9'){
831 return (d[0] - '0') * 10 + (d[1] - '0');
832 }else{
833 return 100; //invalid stream ID
834 }
835 }
836
837 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
838 {
839 AVIContext *avi = s->priv_data;
840 AVIOContext *pb = s->pb;
841 int n, d[8];
842 unsigned int size;
843 int64_t i, sync;
844 void* dstr;
845
846 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
847 int size = dv_get_packet(avi->dv_demux, pkt);
848 if (size >= 0)
849 return size;
850 }
851
852 if(avi->non_interleaved){
853 int best_stream_index = 0;
854 AVStream *best_st= NULL;
855 AVIStream *best_ast;
856 int64_t best_ts= INT64_MAX;
857 int i;
858
859 for(i=0; i<s->nb_streams; i++){
860 AVStream *st = s->streams[i];
861 AVIStream *ast = st->priv_data;
862 int64_t ts= ast->frame_offset;
863 int64_t last_ts;
864
865 if(!st->nb_index_entries)
866 continue;
867
868 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
869 if(!ast->remaining && ts > last_ts)
870 continue;
871
872 ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
873
874 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
875 if(ts < best_ts){
876 best_ts= ts;
877 best_st= st;
878 best_stream_index= i;
879 }
880 }
881 if(!best_st)
882 return -1;
883
884 best_ast = best_st->priv_data;
885 best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
886 if(best_ast->remaining)
887 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
888 else{
889 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
890 if(i>=0)
891 best_ast->frame_offset= best_st->index_entries[i].timestamp;
892 }
893
894 // av_log(s, AV_LOG_DEBUG, "%d\n", i);
895 if(i>=0){
896 int64_t pos= best_st->index_entries[i].pos;
897 pos += best_ast->packet_size - best_ast->remaining;
898 avio_seek(s->pb, pos + 8, SEEK_SET);
899 // av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
900
901 assert(best_ast->remaining <= best_ast->packet_size);
902
903 avi->stream_index= best_stream_index;
904 if(!best_ast->remaining)
905 best_ast->packet_size=
906 best_ast->remaining= best_st->index_entries[i].size;
907 }
908 }
909
910 resync:
911 if(avi->stream_index >= 0){
912 AVStream *st= s->streams[ avi->stream_index ];
913 AVIStream *ast= st->priv_data;
914 int size, err;
915
916 if(get_subtitle_pkt(s, st, pkt))
917 return 0;
918
919 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
920 size= INT_MAX;
921 else if(ast->sample_size < 32)
922 // arbitrary multiplier to avoid tiny packets for raw PCM data
923 size= 1024*ast->sample_size;
924 else
925 size= ast->sample_size;
926
927 if(size > ast->remaining)
928 size= ast->remaining;
929 avi->last_pkt_pos= avio_tell(pb);
930 err= av_get_packet(pb, pkt, size);
931 if(err<0)
932 return err;
933
934 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
935 void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
936 if(ptr){
937 ast->has_pal=0;
938 pkt->size += 4*256;
939 pkt->data= ptr;
940 memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
941 }else
942 av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
943 }
944
945 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
946 dstr = pkt->destruct;
947 size = dv_produce_packet(avi->dv_demux, pkt,
948 pkt->data, pkt->size);
949 pkt->destruct = dstr;
950 pkt->flags |= AV_PKT_FLAG_KEY;
951 if (size < 0)
952 av_free_packet(pkt);
953 } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
954 && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
955 ast->frame_offset++;
956 avi->stream_index = -1;
957 ast->remaining = 0;
958 goto resync;
959 } else {
960 /* XXX: How to handle B-frames in AVI? */
961 pkt->dts = ast->frame_offset;
962 // pkt->dts += ast->start;
963 if(ast->sample_size)
964 pkt->dts /= ast->sample_size;
965 //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);
966 pkt->stream_index = avi->stream_index;
967
968 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
969 AVIndexEntry *e;
970 int index;
971 assert(st->index_entries);
972
973 index= av_index_search_timestamp(st, ast->frame_offset, 0);
974 e= &st->index_entries[index];
975
976 if(index >= 0 && e->timestamp == ast->frame_offset){
977 if (e->flags & AVINDEX_KEYFRAME)
978 pkt->flags |= AV_PKT_FLAG_KEY;
979 }
980 } else {
981 pkt->flags |= AV_PKT_FLAG_KEY;
982 }
983 ast->frame_offset += get_duration(ast, pkt->size);
984 }
985 ast->remaining -= size;
986 if(!ast->remaining){
987 avi->stream_index= -1;
988 ast->packet_size= 0;
989 }
990
991 return size;
992 }
993
994 memset(d, -1, sizeof(int)*8);
995 for(i=sync=avio_tell(pb); !pb->eof_reached; i++) {
996 int j;
997
998 for(j=0; j<7; j++)
999 d[j]= d[j+1];
1000 d[7]= avio_r8(pb);
1001
1002 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
1003
1004 n= get_stream_idx(d+2);
1005 //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);
1006 if(i + (uint64_t)size > avi->fsize || d[0]<0)
1007 continue;
1008
1009 //parse ix##
1010 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
1011 //parse JUNK
1012 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
1013 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
1014 avio_skip(pb, size);
1015 //av_log(s, AV_LOG_DEBUG, "SKIP\n");
1016 goto resync;
1017 }
1018
1019 //parse stray LIST
1020 if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
1021 avio_skip(pb, 4);
1022 goto resync;
1023 }
1024
1025 n= get_stream_idx(d);
1026
1027 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
1028 continue;
1029
1030 //detect ##ix chunk and skip
1031 if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
1032 avio_skip(pb, size);
1033 goto resync;
1034 }
1035
1036 //parse ##dc/##wb
1037 if(n < s->nb_streams){
1038 AVStream *st;
1039 AVIStream *ast;
1040 st = s->streams[n];
1041 ast = st->priv_data;
1042
1043 if(s->nb_streams>=2){
1044 AVStream *st1 = s->streams[1];
1045 AVIStream *ast1= st1->priv_data;
1046 //workaround for broken small-file-bug402.avi
1047 if( d[2] == 'w' && d[3] == 'b'
1048 && n==0
1049 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1050 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1051 && ast->prefix == 'd'*256+'c'
1052 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1053 ){
1054 n=1;
1055 st = st1;
1056 ast = ast1;
1057 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
1058 }
1059 }
1060
1061
1062 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
1063 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
1064 || st->discard >= AVDISCARD_ALL){
1065 ast->frame_offset += get_duration(ast, size);
1066 avio_skip(pb, size);
1067 goto resync;
1068 }
1069
1070 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
1071 int k = avio_r8(pb);
1072 int last = (k + avio_r8(pb) - 1) & 0xFF;
1073
1074 avio_rl16(pb); //flags
1075
1076 for (; k <= last; k++)
1077 ast->pal[k] = avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);
1078 ast->has_pal= 1;
1079 goto resync;
1080 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
1081 d[2]*256+d[3] == ast->prefix /*||
1082 (d[2] == 'd' && d[3] == 'c') ||
1083 (d[2] == 'w' && d[3] == 'b')*/) {
1084
1085 //av_log(s, AV_LOG_DEBUG, "OK\n");
1086 if(d[2]*256+d[3] == ast->prefix)
1087 ast->prefix_count++;
1088 else{
1089 ast->prefix= d[2]*256+d[3];
1090 ast->prefix_count= 0;
1091 }
1092
1093 avi->stream_index= n;
1094 ast->packet_size= size + 8;
1095 ast->remaining= size;
1096
1097 if(size || !ast->sample_size){
1098 uint64_t pos= avio_tell(pb) - 8;
1099 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
1100 av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
1101 }
1102 }
1103 goto resync;
1104 }
1105 }
1106 }
1107
1108 return AVERROR_EOF;
1109 }
1110
1111 /* XXX: We make the implicit supposition that the positions are sorted
1112 for each stream. */
1113 static int avi_read_idx1(AVFormatContext *s, int size)
1114 {
1115 AVIContext *avi = s->priv_data;
1116 AVIOContext *pb = s->pb;
1117 int nb_index_entries, i;
1118 AVStream *st;
1119 AVIStream *ast;
1120 unsigned int index, tag, flags, pos, len;
1121 unsigned last_pos= -1;
1122
1123 nb_index_entries = size / 16;
1124 if (nb_index_entries <= 0)
1125 return -1;
1126
1127 /* Read the entries and sort them in each stream component. */
1128 for(i = 0; i < nb_index_entries; i++) {
1129 tag = avio_rl32(pb);
1130 flags = avio_rl32(pb);
1131 pos = avio_rl32(pb);
1132 len = avio_rl32(pb);
1133 #if defined(DEBUG_SEEK)
1134 av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1135 i, tag, flags, pos, len);
1136 #endif
1137 if(i==0 && pos > avi->movi_list)
1138 avi->movi_list= 0; //FIXME better check
1139 pos += avi->movi_list;
1140
1141 index = ((tag & 0xff) - '0') * 10;
1142 index += ((tag >> 8) & 0xff) - '0';
1143 if (index >= s->nb_streams)
1144 continue;
1145 st = s->streams[index];
1146 ast = st->priv_data;
1147
1148 #if defined(DEBUG_SEEK)
1149 av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1150 #endif
1151 if(pb->eof_reached)
1152 return -1;
1153
1154 if(last_pos == pos)
1155 avi->non_interleaved= 1;
1156 else if(len || !ast->sample_size)
1157 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1158 ast->cum_len += get_duration(ast, len);
1159 last_pos= pos;
1160 }
1161 return 0;
1162 }
1163
1164 static int guess_ni_flag(AVFormatContext *s){
1165 int i;
1166 int64_t last_start=0;
1167 int64_t first_end= INT64_MAX;
1168 int64_t oldpos= avio_tell(s->pb);
1169
1170 for(i=0; i<s->nb_streams; i++){
1171 AVStream *st = s->streams[i];
1172 int n= st->nb_index_entries;
1173 unsigned int size;
1174
1175 if(n <= 0)
1176 continue;
1177
1178 if(n >= 2){
1179 int64_t pos= st->index_entries[0].pos;
1180 avio_seek(s->pb, pos + 4, SEEK_SET);
1181 size= avio_rl32(s->pb);
1182 if(pos + size > st->index_entries[1].pos)
1183 last_start= INT64_MAX;
1184 }
1185
1186 if(st->index_entries[0].pos > last_start)
1187 last_start= st->index_entries[0].pos;
1188 if(st->index_entries[n-1].pos < first_end)
1189 first_end= st->index_entries[n-1].pos;
1190 }
1191 avio_seek(s->pb, oldpos, SEEK_SET);
1192 return last_start > first_end;
1193 }
1194
1195 static int avi_load_index(AVFormatContext *s)
1196 {
1197 AVIContext *avi = s->priv_data;
1198 AVIOContext *pb = s->pb;
1199 uint32_t tag, size;
1200 int64_t pos= avio_tell(pb);
1201 int ret = -1;
1202
1203 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1204 goto the_end; // maybe truncated file
1205 #ifdef DEBUG_SEEK
1206 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1207 #endif
1208 for(;;) {
1209 if (pb->eof_reached)
1210 break;
1211 tag = avio_rl32(pb);
1212 size = avio_rl32(pb);
1213 #ifdef DEBUG_SEEK
1214 printf("tag=%c%c%c%c size=0x%x\n",
1215 tag & 0xff,
1216 (tag >> 8) & 0xff,
1217 (tag >> 16) & 0xff,
1218 (tag >> 24) & 0xff,
1219 size);
1220 #endif
1221 switch(tag) {
1222 case MKTAG('i', 'd', 'x', '1'):
1223 if (avi_read_idx1(s, size) < 0)
1224 goto skip;
1225 ret = 0;
1226 goto the_end;
1227 break;
1228 default:
1229 skip:
1230 size += (size & 1);
1231 if (avio_skip(pb, size) < 0)
1232 goto the_end; // something is wrong here
1233 break;
1234 }
1235 }
1236 the_end:
1237 avio_seek(pb, pos, SEEK_SET);
1238 return ret;
1239 }
1240
1241 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1242 {
1243 AVIStream *ast2 = st2->priv_data;
1244 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1245 av_free_packet(&ast2->sub_pkt);
1246 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1247 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1248 av_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1249 }
1250
1251 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1252 {
1253 AVIContext *avi = s->priv_data;
1254 AVStream *st;
1255 int i, index;
1256 int64_t pos;
1257 AVIStream *ast;
1258
1259 if (!avi->index_loaded) {
1260 /* we only load the index on demand */
1261 avi_load_index(s);
1262 avi->index_loaded = 1;
1263 }
1264 assert(stream_index>= 0);
1265
1266 st = s->streams[stream_index];
1267 ast= st->priv_data;
1268 index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1269 if(index<0)
1270 return -1;
1271
1272 /* find the position */
1273 pos = st->index_entries[index].pos;
1274 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1275
1276 // av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1277
1278 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1279 /* One and only one real stream for DV in AVI, and it has video */
1280 /* offsets. Calling with other stream indexes should have failed */
1281 /* the av_index_search_timestamp call above. */
1282 assert(stream_index == 0);
1283
1284 /* Feed the DV video stream version of the timestamp to the */
1285 /* DV demux so it can synthesize correct timestamps. */
1286 dv_offset_reset(avi->dv_demux, timestamp);
1287
1288 avio_seek(s->pb, pos, SEEK_SET);
1289 avi->stream_index= -1;
1290 return 0;
1291 }
1292
1293 for(i = 0; i < s->nb_streams; i++) {
1294 AVStream *st2 = s->streams[i];
1295 AVIStream *ast2 = st2->priv_data;
1296
1297 ast2->packet_size=
1298 ast2->remaining= 0;
1299
1300 if (ast2->sub_ctx) {
1301 seek_subtitle(st, st2, timestamp);
1302 continue;
1303 }
1304
1305 if (st2->nb_index_entries <= 0)
1306 continue;
1307
1308 // assert(st2->codec->block_align);
1309 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1310 index = av_index_search_timestamp(
1311 st2,
1312 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1313 flags | AVSEEK_FLAG_BACKWARD);
1314 if(index<0)
1315 index=0;
1316
1317 if(!avi->non_interleaved){
1318 while(index>0 && st2->index_entries[index].pos > pos)
1319 index--;
1320 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1321 index++;
1322 }
1323
1324 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1325 /* extract the current frame number */
1326 ast2->frame_offset = st2->index_entries[index].timestamp;
1327 }
1328
1329 /* do the seek */
1330 avio_seek(s->pb, pos, SEEK_SET);
1331 avi->stream_index= -1;
1332 return 0;
1333 }
1334
1335 static int avi_read_close(AVFormatContext *s)
1336 {
1337 int i;
1338 AVIContext *avi = s->priv_data;
1339
1340 for(i=0;i<s->nb_streams;i++) {
1341 AVStream *st = s->streams[i];
1342 AVIStream *ast = st->priv_data;
1343 av_free(st->codec->palctrl);
1344 if (ast) {
1345 if (ast->sub_ctx) {
1346 av_freep(&ast->sub_ctx->pb);
1347 av_close_input_stream(ast->sub_ctx);
1348 }
1349 av_free(ast->sub_buffer);
1350 av_free_packet(&ast->sub_pkt);
1351 }
1352 }
1353
1354 av_free(avi->dv_demux);
1355
1356 return 0;
1357 }
1358
1359 static int avi_probe(AVProbeData *p)
1360 {
1361 int i;
1362
1363 /* check file header */
1364 for(i=0; avi_headers[i][0]; i++)
1365 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1366 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1367 return AVPROBE_SCORE_MAX;
1368
1369 return 0;
1370 }
1371
1372 AVInputFormat ff_avi_demuxer = {
1373 "avi",
1374 NULL_IF_CONFIG_SMALL("AVI format"),
1375 sizeof(AVIContext),
1376 avi_probe,
1377 avi_read_header,
1378 avi_read_packet,
1379 avi_read_close,
1380 avi_read_seek,
1381 };