add ff_get_bmp_header
[libav.git] / libavformat / avidec.c
1 /*
2 * AVI demuxer
3 * Copyright (c) 2001 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 "libavcodec/bytestream.h"
29 #include "avformat.h"
30 #include "avi.h"
31 #include "dv.h"
32 #include "riff.h"
33
34 #undef NDEBUG
35 #include <assert.h>
36
37 typedef struct AVIStream {
38 int64_t frame_offset; /* current frame (video) or byte (audio) counter
39 (used to compute the pts) */
40 int remaining;
41 int packet_size;
42
43 int scale;
44 int rate;
45 int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
46
47 int64_t cum_len; /* temporary storage (used during seek) */
48
49 int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
50 int prefix_count;
51 uint32_t pal[256];
52 int has_pal;
53 int dshow_block_align; ///< block align variable used to emulate bugs in the MS dshow demuxer
54
55 AVFormatContext *sub_ctx;
56 AVPacket sub_pkt;
57 uint8_t *sub_buffer;
58 } AVIStream;
59
60 typedef struct {
61 int64_t riff_end;
62 int64_t movi_end;
63 int64_t fsize;
64 int64_t movi_list;
65 int64_t last_pkt_pos;
66 int index_loaded;
67 int is_odml;
68 int non_interleaved;
69 int stream_index;
70 DVDemuxContext* dv_demux;
71 int odml_depth;
72 #define MAX_ODML_DEPTH 1000
73 } AVIContext;
74
75 static const char avi_headers[][8] = {
76 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
77 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
78 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
79 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
80 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
81 { 0 }
82 };
83
84 static int avi_load_index(AVFormatContext *s);
85 static int guess_ni_flag(AVFormatContext *s);
86
87 #ifdef DEBUG
88 static void print_tag(const char *str, unsigned int tag, int size)
89 {
90 dprintf(NULL, "%s: tag=%c%c%c%c size=0x%x\n",
91 str, tag & 0xff,
92 (tag >> 8) & 0xff,
93 (tag >> 16) & 0xff,
94 (tag >> 24) & 0xff,
95 size);
96 }
97 #endif
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, ByteIOContext *pb)
109 {
110 AVIContext *avi = s->priv_data;
111 char header[8];
112 int i;
113
114 /* check RIFF header */
115 get_buffer(pb, header, 4);
116 avi->riff_end = get_le32(pb); /* RIFF chunk size */
117 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
118 get_buffer(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 ByteIOContext *pb = s->pb;
135 int longs_pre_entry= get_le16(pb);
136 int index_sub_type = get_byte(pb);
137 int index_type = get_byte(pb);
138 int entries_in_use = get_le32(pb);
139 int chunk_id = get_le32(pb);
140 int64_t base = get_le64(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= url_fsize(s->pb);
147
148 #ifdef DEBUG_SEEK
149 av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
150 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
151 #endif
152
153 if(stream_id >= s->nb_streams || stream_id < 0)
154 return -1;
155 st= s->streams[stream_id];
156 ast = st->priv_data;
157
158 if(index_sub_type)
159 return -1;
160
161 get_le32(pb);
162
163 if(index_type && longs_pre_entry != 2)
164 return -1;
165 if(index_type>1)
166 return -1;
167
168 if(filesize > 0 && base >= filesize){
169 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
170 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
171 base &= 0xFFFFFFFF;
172 else
173 return -1;
174 }
175
176 for(i=0; i<entries_in_use; i++){
177 if(index_type){
178 int64_t pos= get_le32(pb) + base - 8;
179 int len = get_le32(pb);
180 int key= len >= 0;
181 len &= 0x7FFFFFFF;
182
183 #ifdef DEBUG_SEEK
184 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
185 #endif
186 if(url_feof(pb))
187 return -1;
188
189 if(last_pos == pos || pos == base - 8)
190 avi->non_interleaved= 1;
191 if(last_pos != pos && (len || !ast->sample_size))
192 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
193
194 ast->cum_len += get_duration(ast, len);
195 last_pos= pos;
196 }else{
197 int64_t offset, pos;
198 int duration;
199 offset = get_le64(pb);
200 get_le32(pb); /* size */
201 duration = get_le32(pb);
202
203 if(url_feof(pb))
204 return -1;
205
206 pos = url_ftell(pb);
207
208 if(avi->odml_depth > MAX_ODML_DEPTH){
209 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
210 return -1;
211 }
212
213 url_fseek(pb, offset+8, SEEK_SET);
214 avi->odml_depth++;
215 read_braindead_odml_indx(s, frame_num);
216 avi->odml_depth--;
217 frame_num += duration;
218
219 url_fseek(pb, pos, SEEK_SET);
220 }
221 }
222 avi->index_loaded=1;
223 return 0;
224 }
225
226 static void clean_index(AVFormatContext *s){
227 int i;
228 int64_t j;
229
230 for(i=0; i<s->nb_streams; i++){
231 AVStream *st = s->streams[i];
232 AVIStream *ast = st->priv_data;
233 int n= st->nb_index_entries;
234 int max= ast->sample_size;
235 int64_t pos, size, ts;
236
237 if(n != 1 || ast->sample_size==0)
238 continue;
239
240 while(max < 1024) max+=max;
241
242 pos= st->index_entries[0].pos;
243 size= st->index_entries[0].size;
244 ts= st->index_entries[0].timestamp;
245
246 for(j=0; j<size; j+=max){
247 av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
248 }
249 }
250 }
251
252 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
253 {
254 ByteIOContext *pb = s->pb;
255 char key[5] = {0}, *value;
256
257 size += (size & 1);
258
259 if (size == UINT_MAX)
260 return -1;
261 value = av_malloc(size+1);
262 if (!value)
263 return -1;
264 get_buffer(pb, value, size);
265 value[size]=0;
266
267 AV_WL32(key, tag);
268
269 return av_metadata_set2(st ? &st->metadata : &s->metadata, key, value,
270 AV_METADATA_DONT_STRDUP_VAL);
271 }
272
273 static void avi_read_info(AVFormatContext *s, uint64_t end)
274 {
275 while (url_ftell(s->pb) < end) {
276 uint32_t tag = get_le32(s->pb);
277 uint32_t size = get_le32(s->pb);
278 avi_read_tag(s, NULL, tag, size);
279 }
280 }
281
282 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
283 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
284
285 static void avi_metadata_creation_time(AVMetadata **metadata, char *date)
286 {
287 char month[4], time[9], buffer[64];
288 int i, day, year;
289 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
290 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
291 month, &day, time, &year) == 4) {
292 for (i=0; i<12; i++)
293 if (!strcasecmp(month, months[i])) {
294 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
295 year, i+1, day, time);
296 av_metadata_set2(metadata, "creation_time", buffer, 0);
297 }
298 } else if (date[4] == '/' && date[7] == '/') {
299 date[4] = date[7] = '-';
300 av_metadata_set2(metadata, "creation_time", date, 0);
301 }
302 }
303
304 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
305 {
306 while (url_ftell(s->pb) < end) {
307 uint32_t tag = get_le32(s->pb);
308 uint32_t size = get_le32(s->pb);
309 switch (tag) {
310 case MKTAG('n', 'c', 't', 'g'): { /* Nikon Tags */
311 uint64_t tag_end = url_ftell(s->pb) + size;
312 while (url_ftell(s->pb) < tag_end) {
313 uint16_t tag = get_le16(s->pb);
314 uint16_t size = get_le16(s->pb);
315 const char *name = NULL;
316 char buffer[64] = {0};
317 size -= get_buffer(s->pb, buffer,
318 FFMIN(size, sizeof(buffer)-1));
319 switch (tag) {
320 case 0x03: name = "maker"; break;
321 case 0x04: name = "model"; break;
322 case 0x13: name = "creation_time";
323 if (buffer[4] == ':' && buffer[7] == ':')
324 buffer[4] = buffer[7] = '-';
325 break;
326 }
327 if (name)
328 av_metadata_set2(&s->metadata, name, buffer, 0);
329 url_fskip(s->pb, size);
330 }
331 break;
332 }
333 default:
334 url_fskip(s->pb, size);
335 break;
336 }
337 }
338 }
339
340 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
341 {
342 AVIContext *avi = s->priv_data;
343 ByteIOContext *pb = s->pb;
344 unsigned int tag, tag1, handler;
345 int codec_type, stream_index, frame_period, bit_rate;
346 unsigned int size;
347 int i;
348 AVStream *st;
349 AVIStream *ast = NULL;
350 int avih_width=0, avih_height=0;
351 int amv_file_format=0;
352 uint64_t list_end = 0;
353
354 avi->stream_index= -1;
355
356 if (get_riff(s, pb) < 0)
357 return -1;
358
359 avi->fsize = url_fsize(pb);
360 if(avi->fsize<=0)
361 avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
362
363 /* first list tag */
364 stream_index = -1;
365 codec_type = -1;
366 frame_period = 0;
367 for(;;) {
368 if (url_feof(pb))
369 goto fail;
370 tag = get_le32(pb);
371 size = get_le32(pb);
372 #ifdef DEBUG
373 print_tag("tag", tag, size);
374 #endif
375
376 switch(tag) {
377 case MKTAG('L', 'I', 'S', 'T'):
378 list_end = url_ftell(pb) + size;
379 /* Ignored, except at start of video packets. */
380 tag1 = get_le32(pb);
381 #ifdef DEBUG
382 print_tag("list", tag1, 0);
383 #endif
384 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
385 avi->movi_list = url_ftell(pb) - 4;
386 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
387 else avi->movi_end = url_fsize(pb);
388 dprintf(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
389 goto end_of_header;
390 }
391 else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
392 avi_read_info(s, list_end);
393 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
394 avi_read_nikon(s, list_end);
395
396 break;
397 case MKTAG('I', 'D', 'I', 'T'): {
398 unsigned char date[64] = {0};
399 size += (size & 1);
400 size -= get_buffer(pb, date, FFMIN(size, sizeof(date)-1));
401 url_fskip(pb, size);
402 avi_metadata_creation_time(&s->metadata, date);
403 break;
404 }
405 case MKTAG('d', 'm', 'l', 'h'):
406 avi->is_odml = 1;
407 url_fskip(pb, size + (size & 1));
408 break;
409 case MKTAG('a', 'm', 'v', 'h'):
410 amv_file_format=1;
411 case MKTAG('a', 'v', 'i', 'h'):
412 /* AVI header */
413 /* using frame_period is bad idea */
414 frame_period = get_le32(pb);
415 bit_rate = get_le32(pb) * 8;
416 get_le32(pb);
417 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
418
419 url_fskip(pb, 2 * 4);
420 get_le32(pb);
421 get_le32(pb);
422 avih_width=get_le32(pb);
423 avih_height=get_le32(pb);
424
425 url_fskip(pb, size - 10 * 4);
426 break;
427 case MKTAG('s', 't', 'r', 'h'):
428 /* stream header */
429
430 tag1 = get_le32(pb);
431 handler = get_le32(pb); /* codec tag */
432
433 if(tag1 == MKTAG('p', 'a', 'd', 's')){
434 url_fskip(pb, size - 8);
435 break;
436 }else{
437 stream_index++;
438 st = av_new_stream(s, stream_index);
439 if (!st)
440 goto fail;
441
442 ast = av_mallocz(sizeof(AVIStream));
443 if (!ast)
444 goto fail;
445 st->priv_data = ast;
446 }
447 if(amv_file_format)
448 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
449
450 #ifdef DEBUG
451 print_tag("strh", tag1, -1);
452 #endif
453 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
454 int64_t dv_dur;
455
456 /*
457 * After some consideration -- I don't think we
458 * have to support anything but DV in type1 AVIs.
459 */
460 if (s->nb_streams != 1)
461 goto fail;
462
463 if (handler != MKTAG('d', 'v', 's', 'd') &&
464 handler != MKTAG('d', 'v', 'h', 'd') &&
465 handler != MKTAG('d', 'v', 's', 'l'))
466 goto fail;
467
468 ast = s->streams[0]->priv_data;
469 av_freep(&s->streams[0]->codec->extradata);
470 av_freep(&s->streams[0]->codec);
471 av_freep(&s->streams[0]);
472 s->nb_streams = 0;
473 if (CONFIG_DV_DEMUXER) {
474 avi->dv_demux = dv_init_demux(s);
475 if (!avi->dv_demux)
476 goto fail;
477 }
478 s->streams[0]->priv_data = ast;
479 url_fskip(pb, 3 * 4);
480 ast->scale = get_le32(pb);
481 ast->rate = get_le32(pb);
482 url_fskip(pb, 4); /* start time */
483
484 dv_dur = get_le32(pb);
485 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
486 dv_dur *= AV_TIME_BASE;
487 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
488 }
489 /*
490 * else, leave duration alone; timing estimation in utils.c
491 * will make a guess based on bitrate.
492 */
493
494 stream_index = s->nb_streams - 1;
495 url_fskip(pb, size - 9*4);
496 break;
497 }
498
499 assert(stream_index < s->nb_streams);
500 st->codec->stream_codec_tag= handler;
501
502 get_le32(pb); /* flags */
503 get_le16(pb); /* priority */
504 get_le16(pb); /* language */
505 get_le32(pb); /* initial frame */
506 ast->scale = get_le32(pb);
507 ast->rate = get_le32(pb);
508 if(!(ast->scale && ast->rate)){
509 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);
510 if(frame_period){
511 ast->rate = 1000000;
512 ast->scale = frame_period;
513 }else{
514 ast->rate = 25;
515 ast->scale = 1;
516 }
517 }
518 av_set_pts_info(st, 64, ast->scale, ast->rate);
519
520 ast->cum_len=get_le32(pb); /* start */
521 st->nb_frames = get_le32(pb);
522
523 st->start_time = 0;
524 get_le32(pb); /* buffer size */
525 get_le32(pb); /* quality */
526 ast->sample_size = get_le32(pb); /* sample ssize */
527 ast->cum_len *= FFMAX(1, ast->sample_size);
528 // av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
529
530 switch(tag1) {
531 case MKTAG('v', 'i', 'd', 's'):
532 codec_type = AVMEDIA_TYPE_VIDEO;
533
534 ast->sample_size = 0;
535 break;
536 case MKTAG('a', 'u', 'd', 's'):
537 codec_type = AVMEDIA_TYPE_AUDIO;
538 break;
539 case MKTAG('t', 'x', 't', 's'):
540 codec_type = AVMEDIA_TYPE_SUBTITLE;
541 break;
542 case MKTAG('d', 'a', 't', 's'):
543 codec_type = AVMEDIA_TYPE_DATA;
544 break;
545 default:
546 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
547 goto fail;
548 }
549 if(ast->sample_size == 0)
550 st->duration = st->nb_frames;
551 ast->frame_offset= ast->cum_len;
552 url_fskip(pb, size - 12 * 4);
553 break;
554 case MKTAG('s', 't', 'r', 'f'):
555 /* stream header */
556 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
557 url_fskip(pb, size);
558 } else {
559 uint64_t cur_pos = url_ftell(pb);
560 if (cur_pos < list_end)
561 size = FFMIN(size, list_end - cur_pos);
562 st = s->streams[stream_index];
563 switch(codec_type) {
564 case AVMEDIA_TYPE_VIDEO:
565 if(amv_file_format){
566 st->codec->width=avih_width;
567 st->codec->height=avih_height;
568 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
569 st->codec->codec_id = CODEC_ID_AMV;
570 url_fskip(pb, size);
571 break;
572 }
573 tag1 = ff_get_bmp_header(pb, st);
574
575 if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
576 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
577 st->codec->codec_tag = tag1;
578 st->codec->codec_id = CODEC_ID_XSUB;
579 break;
580 }
581
582 if(size > 10*4 && size<(1<<30)){
583 st->codec->extradata_size= size - 10*4;
584 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
585 if (!st->codec->extradata) {
586 st->codec->extradata_size= 0;
587 return AVERROR(ENOMEM);
588 }
589 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
590 }
591
592 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
593 get_byte(pb);
594
595 /* Extract palette from extradata if bpp <= 8. */
596 /* This code assumes that extradata contains only palette. */
597 /* This is true for all paletted codecs implemented in FFmpeg. */
598 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
599 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
600 #if HAVE_BIGENDIAN
601 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
602 st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
603 #else
604 memcpy(st->codec->palctrl->palette, st->codec->extradata,
605 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
606 #endif
607 st->codec->palctrl->palette_changed = 1;
608 }
609
610 #ifdef DEBUG
611 print_tag("video", tag1, 0);
612 #endif
613 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
614 st->codec->codec_tag = tag1;
615 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
616 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
617 // Support "Resolution 1:1" for Avid AVI Codec
618 if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
619 st->codec->extradata_size >= 31 &&
620 !memcmp(&st->codec->extradata[28], "1:1", 3))
621 st->codec->codec_id = CODEC_ID_RAWVIDEO;
622
623 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
624 st->codec->extradata_size+= 9;
625 st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
626 if(st->codec->extradata)
627 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
628 }
629 st->codec->height= FFABS(st->codec->height);
630
631 // url_fskip(pb, size - 5 * 4);
632 break;
633 case AVMEDIA_TYPE_AUDIO:
634 ff_get_wav_header(pb, st->codec, size);
635 ast->dshow_block_align= st->codec->block_align;
636 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
637 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
638 ast->sample_size= st->codec->block_align;
639 }
640 if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
641 url_fskip(pb, 1);
642 /* Force parsing as several audio frames can be in
643 * one packet and timestamps refer to packet start. */
644 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
645 /* ADTS header is in extradata, AAC without header must be
646 * stored as exact frames. Parser not needed and it will
647 * fail. */
648 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
649 st->need_parsing = AVSTREAM_PARSE_NONE;
650 /* AVI files with Xan DPCM audio (wrongly) declare PCM
651 * audio in the header but have Axan as stream_code_tag. */
652 if (st->codec->stream_codec_tag == AV_RL32("Axan")){
653 st->codec->codec_id = CODEC_ID_XAN_DPCM;
654 st->codec->codec_tag = 0;
655 }
656 if (amv_file_format){
657 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
658 ast->dshow_block_align = 0;
659 }
660 break;
661 case AVMEDIA_TYPE_SUBTITLE:
662 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
663 st->codec->codec_id = CODEC_ID_PROBE;
664 break;
665 default:
666 st->codec->codec_type = AVMEDIA_TYPE_DATA;
667 st->codec->codec_id= CODEC_ID_NONE;
668 st->codec->codec_tag= 0;
669 url_fskip(pb, size);
670 break;
671 }
672 }
673 break;
674 case MKTAG('i', 'n', 'd', 'x'):
675 i= url_ftell(pb);
676 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
677 read_braindead_odml_indx(s, 0);
678 }
679 url_fseek(pb, i+size, SEEK_SET);
680 break;
681 case MKTAG('v', 'p', 'r', 'p'):
682 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
683 AVRational active, active_aspect;
684
685 st = s->streams[stream_index];
686 get_le32(pb);
687 get_le32(pb);
688 get_le32(pb);
689 get_le32(pb);
690 get_le32(pb);
691
692 active_aspect.den= get_le16(pb);
693 active_aspect.num= get_le16(pb);
694 active.num = get_le32(pb);
695 active.den = get_le32(pb);
696 get_le32(pb); //nbFieldsPerFrame
697
698 if(active_aspect.num && active_aspect.den && active.num && active.den){
699 st->sample_aspect_ratio= av_div_q(active_aspect, active);
700 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
701 }
702 size -= 9*4;
703 }
704 url_fseek(pb, size, SEEK_CUR);
705 break;
706 case MKTAG('s', 't', 'r', 'n'):
707 if(s->nb_streams){
708 avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
709 break;
710 }
711 default:
712 if(size > 1000000){
713 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
714 "I will ignore it and try to continue anyway.\n");
715 avi->movi_list = url_ftell(pb) - 4;
716 avi->movi_end = url_fsize(pb);
717 goto end_of_header;
718 }
719 /* skip tag */
720 size += (size & 1);
721 url_fskip(pb, size);
722 break;
723 }
724 }
725 end_of_header:
726 /* check stream number */
727 if (stream_index != s->nb_streams - 1) {
728 fail:
729 return -1;
730 }
731
732 if(!avi->index_loaded && !url_is_streamed(pb))
733 avi_load_index(s);
734 avi->index_loaded = 1;
735 avi->non_interleaved |= guess_ni_flag(s);
736 for(i=0; i<s->nb_streams; i++){
737 AVStream *st = s->streams[i];
738 if(st->nb_index_entries)
739 break;
740 }
741 if(i==s->nb_streams && avi->non_interleaved) {
742 av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
743 avi->non_interleaved=0;
744 }
745
746 if(avi->non_interleaved) {
747 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
748 clean_index(s);
749 }
750
751 ff_metadata_conv_ctx(s, NULL, ff_avi_metadata_conv);
752
753 return 0;
754 }
755
756 static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
757 if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
758 uint8_t desc[256], *d = desc;
759 uint8_t *end, *ptr = pkt->data+7;
760 unsigned int size, desc_len = bytestream_get_le32(&ptr);
761 int score = AVPROBE_SCORE_MAX / 2;
762 AVIStream *ast = st->priv_data;
763 AVInputFormat *sub_demuxer;
764 AVRational time_base;
765 ByteIOContext *pb;
766 AVProbeData pd;
767
768 if (desc_len > FFMAX(pkt->size-17, 0))
769 return 0;
770
771 end = ptr + desc_len;
772 while (ptr < end-1) {
773 uint8_t tmp;
774 uint32_t ch;
775 GET_UTF16(ch, ptr < end-1 ? bytestream_get_le16(&ptr) : 0, break;);
776 PUT_UTF8(ch, tmp, if(d-desc < sizeof(desc)-1) *d++ = tmp;);
777 }
778 *d = 0;
779 if (*desc)
780 av_metadata_set2(&st->metadata, "title", desc, 0);
781
782 ptr = end + 2;
783 size = bytestream_get_le32(&ptr);
784 size = FFMIN(size, pkt->size+pkt->data-ptr);
785
786 pd = (AVProbeData) { .buf = ptr, .buf_size = size };
787 if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
788 return 0;
789
790 pb = av_alloc_put_byte(ptr, size, 0, NULL, NULL, NULL, NULL);
791 if (!av_open_input_stream(&ast->sub_ctx, pb, "", sub_demuxer, NULL)) {
792 av_read_packet(ast->sub_ctx, &ast->sub_pkt);
793 *st->codec = *ast->sub_ctx->streams[0]->codec;
794 ast->sub_ctx->streams[0]->codec->extradata = NULL;
795 time_base = ast->sub_ctx->streams[0]->time_base;
796 av_set_pts_info(st, 64, time_base.num, time_base.den);
797 }
798 ast->sub_buffer = pkt->data;
799 memset(pkt, 0, sizeof(*pkt));
800 return 1;
801 }
802 return 0;
803 }
804
805 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
806 AVPacket *pkt)
807 {
808 AVIStream *ast, *next_ast = next_st->priv_data;
809 int64_t ts, next_ts, ts_min = INT64_MAX;
810 AVStream *st, *sub_st = NULL;
811 int i;
812
813 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
814 AV_TIME_BASE_Q);
815
816 for (i=0; i<s->nb_streams; i++) {
817 st = s->streams[i];
818 ast = st->priv_data;
819 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
820 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
821 if (ts <= next_ts && ts < ts_min) {
822 ts_min = ts;
823 sub_st = st;
824 }
825 }
826 }
827
828 if (sub_st) {
829 ast = sub_st->priv_data;
830 *pkt = ast->sub_pkt;
831 pkt->stream_index = sub_st->index;
832 if (av_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
833 ast->sub_pkt.data = NULL;
834 }
835 return sub_st;
836 }
837
838 static int get_stream_idx(int *d){
839 if( d[0] >= '0' && d[0] <= '9'
840 && d[1] >= '0' && d[1] <= '9'){
841 return (d[0] - '0') * 10 + (d[1] - '0');
842 }else{
843 return 100; //invalid stream ID
844 }
845 }
846
847 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
848 {
849 AVIContext *avi = s->priv_data;
850 ByteIOContext *pb = s->pb;
851 int n, d[8];
852 unsigned int size;
853 int64_t i, sync;
854 void* dstr;
855
856 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
857 int size = dv_get_packet(avi->dv_demux, pkt);
858 if (size >= 0)
859 return size;
860 }
861
862 if(avi->non_interleaved){
863 int best_stream_index = 0;
864 AVStream *best_st= NULL;
865 AVIStream *best_ast;
866 int64_t best_ts= INT64_MAX;
867 int i;
868
869 for(i=0; i<s->nb_streams; i++){
870 AVStream *st = s->streams[i];
871 AVIStream *ast = st->priv_data;
872 int64_t ts= ast->frame_offset;
873 int64_t last_ts;
874
875 if(!st->nb_index_entries)
876 continue;
877
878 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
879 if(!ast->remaining && ts > last_ts)
880 continue;
881
882 ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
883
884 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
885 if(ts < best_ts){
886 best_ts= ts;
887 best_st= st;
888 best_stream_index= i;
889 }
890 }
891 if(!best_st)
892 return -1;
893
894 best_ast = best_st->priv_data;
895 best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
896 if(best_ast->remaining)
897 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
898 else{
899 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
900 if(i>=0)
901 best_ast->frame_offset= best_st->index_entries[i].timestamp;
902 }
903
904 // av_log(s, AV_LOG_DEBUG, "%d\n", i);
905 if(i>=0){
906 int64_t pos= best_st->index_entries[i].pos;
907 pos += best_ast->packet_size - best_ast->remaining;
908 url_fseek(s->pb, pos + 8, SEEK_SET);
909 // av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
910
911 assert(best_ast->remaining <= best_ast->packet_size);
912
913 avi->stream_index= best_stream_index;
914 if(!best_ast->remaining)
915 best_ast->packet_size=
916 best_ast->remaining= best_st->index_entries[i].size;
917 }
918 }
919
920 resync:
921 if(avi->stream_index >= 0){
922 AVStream *st= s->streams[ avi->stream_index ];
923 AVIStream *ast= st->priv_data;
924 int size, err;
925
926 if(get_subtitle_pkt(s, st, pkt))
927 return 0;
928
929 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
930 size= INT_MAX;
931 else if(ast->sample_size < 32)
932 // arbitrary multiplier to avoid tiny packets for raw PCM data
933 size= 1024*ast->sample_size;
934 else
935 size= ast->sample_size;
936
937 if(size > ast->remaining)
938 size= ast->remaining;
939 avi->last_pkt_pos= url_ftell(pb);
940 err= av_get_packet(pb, pkt, size);
941 if(err<0)
942 return err;
943
944 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
945 void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
946 if(ptr){
947 ast->has_pal=0;
948 pkt->size += 4*256;
949 pkt->data= ptr;
950 memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
951 }else
952 av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
953 }
954
955 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
956 dstr = pkt->destruct;
957 size = dv_produce_packet(avi->dv_demux, pkt,
958 pkt->data, pkt->size);
959 pkt->destruct = dstr;
960 pkt->flags |= AV_PKT_FLAG_KEY;
961 if (size < 0)
962 av_free_packet(pkt);
963 } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
964 && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
965 ast->frame_offset++;
966 avi->stream_index = -1;
967 ast->remaining = 0;
968 goto resync;
969 } else {
970 /* XXX: How to handle B-frames in AVI? */
971 pkt->dts = ast->frame_offset;
972 // pkt->dts += ast->start;
973 if(ast->sample_size)
974 pkt->dts /= ast->sample_size;
975 //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);
976 pkt->stream_index = avi->stream_index;
977
978 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
979 AVIndexEntry *e;
980 int index;
981 assert(st->index_entries);
982
983 index= av_index_search_timestamp(st, ast->frame_offset, 0);
984 e= &st->index_entries[index];
985
986 if(index >= 0 && e->timestamp == ast->frame_offset){
987 if (e->flags & AVINDEX_KEYFRAME)
988 pkt->flags |= AV_PKT_FLAG_KEY;
989 }
990 } else {
991 pkt->flags |= AV_PKT_FLAG_KEY;
992 }
993 ast->frame_offset += get_duration(ast, pkt->size);
994 }
995 ast->remaining -= size;
996 if(!ast->remaining){
997 avi->stream_index= -1;
998 ast->packet_size= 0;
999 }
1000
1001 return size;
1002 }
1003
1004 memset(d, -1, sizeof(int)*8);
1005 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
1006 int j;
1007
1008 for(j=0; j<7; j++)
1009 d[j]= d[j+1];
1010 d[7]= get_byte(pb);
1011
1012 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
1013
1014 n= get_stream_idx(d+2);
1015 //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);
1016 if(i + (uint64_t)size > avi->fsize || d[0]<0)
1017 continue;
1018
1019 //parse ix##
1020 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
1021 //parse JUNK
1022 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
1023 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
1024 url_fskip(pb, size);
1025 //av_log(s, AV_LOG_DEBUG, "SKIP\n");
1026 goto resync;
1027 }
1028
1029 //parse stray LIST
1030 if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
1031 url_fskip(pb, 4);
1032 goto resync;
1033 }
1034
1035 n= get_stream_idx(d);
1036
1037 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
1038 continue;
1039
1040 //detect ##ix chunk and skip
1041 if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
1042 url_fskip(pb, size);
1043 goto resync;
1044 }
1045
1046 //parse ##dc/##wb
1047 if(n < s->nb_streams){
1048 AVStream *st;
1049 AVIStream *ast;
1050 st = s->streams[n];
1051 ast = st->priv_data;
1052
1053 if(s->nb_streams>=2){
1054 AVStream *st1 = s->streams[1];
1055 AVIStream *ast1= st1->priv_data;
1056 //workaround for broken small-file-bug402.avi
1057 if( d[2] == 'w' && d[3] == 'b'
1058 && n==0
1059 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1060 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1061 && ast->prefix == 'd'*256+'c'
1062 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1063 ){
1064 n=1;
1065 st = st1;
1066 ast = ast1;
1067 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
1068 }
1069 }
1070
1071
1072 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
1073 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
1074 || st->discard >= AVDISCARD_ALL){
1075 ast->frame_offset += get_duration(ast, size);
1076 url_fskip(pb, size);
1077 goto resync;
1078 }
1079
1080 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
1081 int k = get_byte(pb);
1082 int last = (k + get_byte(pb) - 1) & 0xFF;
1083
1084 get_le16(pb); //flags
1085
1086 for (; k <= last; k++)
1087 ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
1088 ast->has_pal= 1;
1089 goto resync;
1090 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
1091 d[2]*256+d[3] == ast->prefix /*||
1092 (d[2] == 'd' && d[3] == 'c') ||
1093 (d[2] == 'w' && d[3] == 'b')*/) {
1094
1095 //av_log(s, AV_LOG_DEBUG, "OK\n");
1096 if(d[2]*256+d[3] == ast->prefix)
1097 ast->prefix_count++;
1098 else{
1099 ast->prefix= d[2]*256+d[3];
1100 ast->prefix_count= 0;
1101 }
1102
1103 avi->stream_index= n;
1104 ast->packet_size= size + 8;
1105 ast->remaining= size;
1106
1107 if(size || !ast->sample_size){
1108 uint64_t pos= url_ftell(pb) - 8;
1109 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
1110 av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
1111 }
1112 }
1113 goto resync;
1114 }
1115 }
1116 }
1117
1118 return AVERROR_EOF;
1119 }
1120
1121 /* XXX: We make the implicit supposition that the positions are sorted
1122 for each stream. */
1123 static int avi_read_idx1(AVFormatContext *s, int size)
1124 {
1125 AVIContext *avi = s->priv_data;
1126 ByteIOContext *pb = s->pb;
1127 int nb_index_entries, i;
1128 AVStream *st;
1129 AVIStream *ast;
1130 unsigned int index, tag, flags, pos, len;
1131 unsigned last_pos= -1;
1132
1133 nb_index_entries = size / 16;
1134 if (nb_index_entries <= 0)
1135 return -1;
1136
1137 /* Read the entries and sort them in each stream component. */
1138 for(i = 0; i < nb_index_entries; i++) {
1139 tag = get_le32(pb);
1140 flags = get_le32(pb);
1141 pos = get_le32(pb);
1142 len = get_le32(pb);
1143 #if defined(DEBUG_SEEK)
1144 av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1145 i, tag, flags, pos, len);
1146 #endif
1147 if(i==0 && pos > avi->movi_list)
1148 avi->movi_list= 0; //FIXME better check
1149 pos += avi->movi_list;
1150
1151 index = ((tag & 0xff) - '0') * 10;
1152 index += ((tag >> 8) & 0xff) - '0';
1153 if (index >= s->nb_streams)
1154 continue;
1155 st = s->streams[index];
1156 ast = st->priv_data;
1157
1158 #if defined(DEBUG_SEEK)
1159 av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1160 #endif
1161 if(url_feof(pb))
1162 return -1;
1163
1164 if(last_pos == pos)
1165 avi->non_interleaved= 1;
1166 else if(len || !ast->sample_size)
1167 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1168 ast->cum_len += get_duration(ast, len);
1169 last_pos= pos;
1170 }
1171 return 0;
1172 }
1173
1174 static int guess_ni_flag(AVFormatContext *s){
1175 int i;
1176 int64_t last_start=0;
1177 int64_t first_end= INT64_MAX;
1178 int64_t oldpos= url_ftell(s->pb);
1179
1180 for(i=0; i<s->nb_streams; i++){
1181 AVStream *st = s->streams[i];
1182 int n= st->nb_index_entries;
1183 unsigned int size;
1184
1185 if(n <= 0)
1186 continue;
1187
1188 if(n >= 2){
1189 int64_t pos= st->index_entries[0].pos;
1190 url_fseek(s->pb, pos + 4, SEEK_SET);
1191 size= get_le32(s->pb);
1192 if(pos + size > st->index_entries[1].pos)
1193 last_start= INT64_MAX;
1194 }
1195
1196 if(st->index_entries[0].pos > last_start)
1197 last_start= st->index_entries[0].pos;
1198 if(st->index_entries[n-1].pos < first_end)
1199 first_end= st->index_entries[n-1].pos;
1200 }
1201 url_fseek(s->pb, oldpos, SEEK_SET);
1202 return last_start > first_end;
1203 }
1204
1205 static int avi_load_index(AVFormatContext *s)
1206 {
1207 AVIContext *avi = s->priv_data;
1208 ByteIOContext *pb = s->pb;
1209 uint32_t tag, size;
1210 int64_t pos= url_ftell(pb);
1211 int ret = -1;
1212
1213 if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0)
1214 goto the_end; // maybe truncated file
1215 #ifdef DEBUG_SEEK
1216 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1217 #endif
1218 for(;;) {
1219 if (url_feof(pb))
1220 break;
1221 tag = get_le32(pb);
1222 size = get_le32(pb);
1223 #ifdef DEBUG_SEEK
1224 printf("tag=%c%c%c%c size=0x%x\n",
1225 tag & 0xff,
1226 (tag >> 8) & 0xff,
1227 (tag >> 16) & 0xff,
1228 (tag >> 24) & 0xff,
1229 size);
1230 #endif
1231 switch(tag) {
1232 case MKTAG('i', 'd', 'x', '1'):
1233 if (avi_read_idx1(s, size) < 0)
1234 goto skip;
1235 ret = 0;
1236 goto the_end;
1237 break;
1238 default:
1239 skip:
1240 size += (size & 1);
1241 if (url_fseek(pb, size, SEEK_CUR) < 0)
1242 goto the_end; // something is wrong here
1243 break;
1244 }
1245 }
1246 the_end:
1247 url_fseek(pb, pos, SEEK_SET);
1248 return ret;
1249 }
1250
1251 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1252 {
1253 AVIStream *ast2 = st2->priv_data;
1254 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1255 av_free_packet(&ast2->sub_pkt);
1256 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1257 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1258 av_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1259 }
1260
1261 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1262 {
1263 AVIContext *avi = s->priv_data;
1264 AVStream *st;
1265 int i, index;
1266 int64_t pos;
1267 AVIStream *ast;
1268
1269 if (!avi->index_loaded) {
1270 /* we only load the index on demand */
1271 avi_load_index(s);
1272 avi->index_loaded = 1;
1273 }
1274 assert(stream_index>= 0);
1275
1276 st = s->streams[stream_index];
1277 ast= st->priv_data;
1278 index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1279 if(index<0)
1280 return -1;
1281
1282 /* find the position */
1283 pos = st->index_entries[index].pos;
1284 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1285
1286 // av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1287
1288 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1289 /* One and only one real stream for DV in AVI, and it has video */
1290 /* offsets. Calling with other stream indexes should have failed */
1291 /* the av_index_search_timestamp call above. */
1292 assert(stream_index == 0);
1293
1294 /* Feed the DV video stream version of the timestamp to the */
1295 /* DV demux so it can synthesize correct timestamps. */
1296 dv_offset_reset(avi->dv_demux, timestamp);
1297
1298 url_fseek(s->pb, pos, SEEK_SET);
1299 avi->stream_index= -1;
1300 return 0;
1301 }
1302
1303 for(i = 0; i < s->nb_streams; i++) {
1304 AVStream *st2 = s->streams[i];
1305 AVIStream *ast2 = st2->priv_data;
1306
1307 ast2->packet_size=
1308 ast2->remaining= 0;
1309
1310 if (ast2->sub_ctx) {
1311 seek_subtitle(st, st2, timestamp);
1312 continue;
1313 }
1314
1315 if (st2->nb_index_entries <= 0)
1316 continue;
1317
1318 // assert(st2->codec->block_align);
1319 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1320 index = av_index_search_timestamp(
1321 st2,
1322 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1323 flags | AVSEEK_FLAG_BACKWARD);
1324 if(index<0)
1325 index=0;
1326
1327 if(!avi->non_interleaved){
1328 while(index>0 && st2->index_entries[index].pos > pos)
1329 index--;
1330 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1331 index++;
1332 }
1333
1334 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1335 /* extract the current frame number */
1336 ast2->frame_offset = st2->index_entries[index].timestamp;
1337 }
1338
1339 /* do the seek */
1340 url_fseek(s->pb, pos, SEEK_SET);
1341 avi->stream_index= -1;
1342 return 0;
1343 }
1344
1345 static int avi_read_close(AVFormatContext *s)
1346 {
1347 int i;
1348 AVIContext *avi = s->priv_data;
1349
1350 for(i=0;i<s->nb_streams;i++) {
1351 AVStream *st = s->streams[i];
1352 AVIStream *ast = st->priv_data;
1353 av_free(st->codec->palctrl);
1354 if (ast) {
1355 if (ast->sub_ctx) {
1356 av_freep(&ast->sub_ctx->pb);
1357 av_close_input_stream(ast->sub_ctx);
1358 }
1359 av_free(ast->sub_buffer);
1360 av_free_packet(&ast->sub_pkt);
1361 }
1362 }
1363
1364 if (avi->dv_demux)
1365 av_free(avi->dv_demux);
1366
1367 return 0;
1368 }
1369
1370 static int avi_probe(AVProbeData *p)
1371 {
1372 int i;
1373
1374 /* check file header */
1375 for(i=0; avi_headers[i][0]; i++)
1376 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1377 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1378 return AVPROBE_SCORE_MAX;
1379
1380 return 0;
1381 }
1382
1383 AVInputFormat avi_demuxer = {
1384 "avi",
1385 NULL_IF_CONFIG_SMALL("AVI format"),
1386 sizeof(AVIContext),
1387 avi_probe,
1388 avi_read_header,
1389 avi_read_packet,
1390 avi_read_close,
1391 avi_read_seek,
1392 };