changing AVCodecContext codec -> *codec in AVStream so additions to AVCodecContext...
[libav.git] / libavformat / avidec.c
1 /*
2 * AVI decoder.
3 * Copyright (c) 2001 Fabrice Bellard.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19 #include "avformat.h"
20 #include "avi.h"
21 #include "dv.h"
22
23 #undef NDEBUG
24 #include <assert.h>
25
26 //#define DEBUG
27 //#define DEBUG_SEEK
28
29 typedef struct AVIStream {
30 int64_t frame_offset; /* current frame (video) or byte (audio) counter
31 (used to compute the pts) */
32 int remaining;
33 int packet_size;
34
35 int scale;
36 int rate;
37 int sample_size; /* audio only data */
38 int start;
39
40 int cum_len; /* temporary storage (used during seek) */
41
42 int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
43 int prefix_count;
44 } AVIStream;
45
46 typedef struct {
47 int64_t riff_end;
48 int64_t movi_end;
49 offset_t movi_list;
50 int index_loaded;
51 int is_odml;
52 int non_interleaved;
53 int stream_index;
54 DVDemuxContext* dv_demux;
55 } AVIContext;
56
57 static int avi_load_index(AVFormatContext *s);
58
59 #ifdef DEBUG
60 static void print_tag(const char *str, unsigned int tag, int size)
61 {
62 printf("%s: tag=%c%c%c%c size=0x%x\n",
63 str, tag & 0xff,
64 (tag >> 8) & 0xff,
65 (tag >> 16) & 0xff,
66 (tag >> 24) & 0xff,
67 size);
68 }
69 #endif
70
71 static int get_riff(AVIContext *avi, ByteIOContext *pb)
72 {
73 uint32_t tag;
74 /* check RIFF header */
75 tag = get_le32(pb);
76
77 if (tag != MKTAG('R', 'I', 'F', 'F'))
78 return -1;
79 avi->riff_end = get_le32(pb); /* RIFF chunk size */
80 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
81 tag = get_le32(pb);
82 if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
83 return -1;
84
85 return 0;
86 }
87
88 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
89 {
90 AVIContext *avi = s->priv_data;
91 ByteIOContext *pb = &s->pb;
92 uint32_t tag, tag1, handler;
93 int codec_type, stream_index, frame_period, bit_rate;
94 unsigned int size, nb_frames;
95 int i, n;
96 AVStream *st;
97 AVIStream *ast;
98 int xan_video = 0; /* hack to support Xan A/V */
99
100 avi->stream_index= -1;
101
102 if (get_riff(avi, pb) < 0)
103 return -1;
104
105 /* first list tag */
106 stream_index = -1;
107 codec_type = -1;
108 frame_period = 0;
109 for(;;) {
110 if (url_feof(pb))
111 goto fail;
112 tag = get_le32(pb);
113 size = get_le32(pb);
114 #ifdef DEBUG
115 print_tag("tag", tag, size);
116 #endif
117
118 switch(tag) {
119 case MKTAG('L', 'I', 'S', 'T'):
120 /* ignored, except when start of video packets */
121 tag1 = get_le32(pb);
122 #ifdef DEBUG
123 print_tag("list", tag1, 0);
124 #endif
125 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
126 avi->movi_list = url_ftell(pb) - 4;
127 if(size) avi->movi_end = avi->movi_list + size;
128 else avi->movi_end = url_fsize(pb);
129 #ifdef DEBUG
130 printf("movi end=%Lx\n", avi->movi_end);
131 #endif
132 goto end_of_header;
133 }
134 break;
135 case MKTAG('d', 'm', 'l', 'h'):
136 avi->is_odml = 1;
137 url_fskip(pb, size + (size & 1));
138 break;
139 case MKTAG('a', 'v', 'i', 'h'):
140 /* avi header */
141 /* using frame_period is bad idea */
142 frame_period = get_le32(pb);
143 bit_rate = get_le32(pb) * 8;
144 url_fskip(pb, 4 * 4);
145 n = get_le32(pb);
146 for(i=0;i<n;i++) {
147 AVIStream *ast;
148 st = av_new_stream(s, i);
149 if (!st)
150 goto fail;
151
152 ast = av_mallocz(sizeof(AVIStream));
153 if (!ast)
154 goto fail;
155 st->priv_data = ast;
156 }
157 url_fskip(pb, size - 7 * 4);
158 break;
159 case MKTAG('s', 't', 'r', 'h'):
160 /* stream header */
161 stream_index++;
162 tag1 = get_le32(pb);
163 handler = get_le32(pb); /* codec tag */
164 #ifdef DEBUG
165 print_tag("strh", tag1, -1);
166 #endif
167 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
168 /*
169 * After some consideration -- I don't think we
170 * have to support anything but DV in a type1 AVIs.
171 */
172 if (s->nb_streams != 1)
173 goto fail;
174
175 if (handler != MKTAG('d', 'v', 's', 'd') &&
176 handler != MKTAG('d', 'v', 'h', 'd') &&
177 handler != MKTAG('d', 'v', 's', 'l'))
178 goto fail;
179
180 ast = s->streams[0]->priv_data;
181 av_freep(&s->streams[0]->codec->extradata);
182 av_freep(&s->streams[0]);
183 s->nb_streams = 0;
184 avi->dv_demux = dv_init_demux(s);
185 if (!avi->dv_demux)
186 goto fail;
187 s->streams[0]->priv_data = ast;
188 url_fskip(pb, 3 * 4);
189 ast->scale = get_le32(pb);
190 ast->rate = get_le32(pb);
191 stream_index = s->nb_streams - 1;
192 url_fskip(pb, size - 7*4);
193 break;
194 }
195
196 if (stream_index >= s->nb_streams) {
197 url_fskip(pb, size - 8);
198 break;
199 }
200 st = s->streams[stream_index];
201 ast = st->priv_data;
202 st->codec->stream_codec_tag= handler;
203
204 get_le32(pb); /* flags */
205 get_le16(pb); /* priority */
206 get_le16(pb); /* language */
207 get_le32(pb); /* initial frame */
208 ast->scale = get_le32(pb);
209 ast->rate = get_le32(pb);
210 if(ast->scale && ast->rate){
211 }else if(frame_period){
212 ast->rate = 1000000;
213 ast->scale = frame_period;
214 }else{
215 ast->rate = 25;
216 ast->scale = 1;
217 }
218 av_set_pts_info(st, 64, ast->scale, ast->rate);
219
220 ast->start= get_le32(pb); /* start */
221 nb_frames = get_le32(pb);
222
223 st->start_time = 0;
224 st->duration = nb_frames;
225 get_le32(pb); /* buffer size */
226 get_le32(pb); /* quality */
227 ast->sample_size = get_le32(pb); /* sample ssize */
228 // av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
229
230 switch(tag1) {
231 case MKTAG('v', 'i', 'd', 's'):
232 codec_type = CODEC_TYPE_VIDEO;
233
234 ast->sample_size = 0;
235 break;
236 case MKTAG('a', 'u', 'd', 's'):
237 codec_type = CODEC_TYPE_AUDIO;
238 break;
239 case MKTAG('t', 'x', 't', 's'):
240 //FIXME
241 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
242 break;
243 case MKTAG('p', 'a', 'd', 's'):
244 codec_type = CODEC_TYPE_UNKNOWN;
245 stream_index--;
246 break;
247 default:
248 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
249 goto fail;
250 }
251 url_fskip(pb, size - 12 * 4);
252 break;
253 case MKTAG('s', 't', 'r', 'f'):
254 /* stream header */
255 if (stream_index >= s->nb_streams || avi->dv_demux) {
256 url_fskip(pb, size);
257 } else {
258 st = s->streams[stream_index];
259 switch(codec_type) {
260 case CODEC_TYPE_VIDEO:
261 get_le32(pb); /* size */
262 st->codec->width = get_le32(pb);
263 st->codec->height = get_le32(pb);
264 get_le16(pb); /* panes */
265 st->codec->bits_per_sample= get_le16(pb); /* depth */
266 tag1 = get_le32(pb);
267 get_le32(pb); /* ImageSize */
268 get_le32(pb); /* XPelsPerMeter */
269 get_le32(pb); /* YPelsPerMeter */
270 get_le32(pb); /* ClrUsed */
271 get_le32(pb); /* ClrImportant */
272
273 if(size > 10*4 && size<(1<<30)){
274 st->codec->extradata_size= size - 10*4;
275 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
276 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
277 }
278
279 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
280 get_byte(pb);
281
282 /* Extract palette from extradata if bpp <= 8 */
283 /* This code assumes that extradata contains only palette */
284 /* This is true for all paletted codecs implemented in ffmpeg */
285 if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
286 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
287 #ifdef WORDS_BIGENDIAN
288 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
289 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
290 #else
291 memcpy(st->codec->palctrl->palette, st->codec->extradata,
292 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
293 #endif
294 st->codec->palctrl->palette_changed = 1;
295 }
296
297 #ifdef DEBUG
298 print_tag("video", tag1, 0);
299 #endif
300 st->codec->codec_type = CODEC_TYPE_VIDEO;
301 st->codec->codec_tag = tag1;
302 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
303 if (st->codec->codec_id == CODEC_ID_XAN_WC4)
304 xan_video = 1;
305 // url_fskip(pb, size - 5 * 4);
306 break;
307 case CODEC_TYPE_AUDIO:
308 get_wav_header(pb, st->codec, size);
309 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
310 url_fskip(pb, 1);
311 /* special case time: To support Xan DPCM, hardcode
312 * the format if Xxan is the video codec */
313 st->need_parsing = 1;
314 /* force parsing as several audio frames can be in
315 one packet */
316 if (xan_video)
317 st->codec->codec_id = CODEC_ID_XAN_DPCM;
318 break;
319 default:
320 st->codec->codec_type = CODEC_TYPE_DATA;
321 st->codec->codec_id= CODEC_ID_NONE;
322 st->codec->codec_tag= 0;
323 url_fskip(pb, size);
324 break;
325 }
326 }
327 break;
328 default:
329 /* skip tag */
330 size += (size & 1);
331 url_fskip(pb, size);
332 break;
333 }
334 }
335 end_of_header:
336 /* check stream number */
337 if (stream_index != s->nb_streams - 1) {
338 fail:
339 for(i=0;i<s->nb_streams;i++) {
340 av_freep(&s->streams[i]->codec->extradata);
341 av_freep(&s->streams[i]);
342 }
343 return -1;
344 }
345
346 assert(!avi->index_loaded);
347 avi_load_index(s);
348 avi->index_loaded = 1;
349
350 return 0;
351 }
352
353 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
354 {
355 AVIContext *avi = s->priv_data;
356 ByteIOContext *pb = &s->pb;
357 int n, d[8], size;
358 offset_t i, sync;
359 void* dstr;
360
361 if (avi->dv_demux) {
362 size = dv_get_packet(avi->dv_demux, pkt);
363 if (size >= 0)
364 return size;
365 }
366
367 if(avi->non_interleaved){
368 int best_stream_index;
369 AVStream *best_st= NULL;
370 AVIStream *best_ast;
371 int64_t best_ts= INT64_MAX;
372 int i;
373
374 for(i=0; i<s->nb_streams; i++){
375 AVStream *st = s->streams[i];
376 AVIStream *ast = st->priv_data;
377 int64_t ts= ast->frame_offset;
378
379 if(ast->sample_size)
380 ts /= ast->sample_size;
381 ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
382
383 // av_log(NULL, AV_LOG_DEBUG, "%Ld %d/%d %Ld\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
384 if(ts < best_ts){
385 best_ts= ts;
386 best_st= st;
387 best_stream_index= i;
388 }
389 }
390 best_ast = best_st->priv_data;
391 best_ts= av_rescale(best_ts, best_st->time_base.den, AV_TIME_BASE * (int64_t)best_st->time_base.num); //FIXME a little ugly
392 if(best_ast->remaining)
393 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
394 else
395 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
396
397 // av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
398 if(i>=0){
399 int64_t pos= best_st->index_entries[i].pos;
400 pos += avi->movi_list + best_ast->packet_size - best_ast->remaining;
401 url_fseek(&s->pb, pos, SEEK_SET);
402 // av_log(NULL, AV_LOG_DEBUG, "pos=%Ld\n", pos);
403
404 if(best_ast->remaining)
405 avi->stream_index= best_stream_index;
406 else
407 avi->stream_index= -1;
408 }
409 }
410
411 resync:
412 if(avi->stream_index >= 0){
413 AVStream *st= s->streams[ avi->stream_index ];
414 AVIStream *ast= st->priv_data;
415 int size;
416
417 if(ast->sample_size == 0)
418 size= INT_MAX;
419 else if(ast->sample_size < 32)
420 size= 64*ast->sample_size;
421 else
422 size= ast->sample_size;
423
424 if(size > ast->remaining)
425 size= ast->remaining;
426 av_get_packet(pb, pkt, size);
427
428 if (avi->dv_demux) {
429 dstr = pkt->destruct;
430 size = dv_produce_packet(avi->dv_demux, pkt,
431 pkt->data, pkt->size);
432 pkt->destruct = dstr;
433 pkt->flags |= PKT_FLAG_KEY;
434 } else {
435 /* XXX: how to handle B frames in avi ? */
436 pkt->dts = ast->frame_offset;
437 // pkt->dts += ast->start;
438 if(ast->sample_size)
439 pkt->dts /= ast->sample_size;
440 //av_log(NULL, AV_LOG_DEBUG, "dts:%Ld offset:%d %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, n, size);
441 pkt->stream_index = avi->stream_index;
442
443 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
444 if(st->index_entries){
445 AVIndexEntry *e;
446 int index;
447
448 index= av_index_search_timestamp(st, pkt->dts, 0);
449 e= &st->index_entries[index];
450
451 if(index >= 0 && e->timestamp == ast->frame_offset){
452 if (e->flags & AVINDEX_KEYFRAME)
453 pkt->flags |= PKT_FLAG_KEY;
454 }
455 } else {
456 /* if no index, better to say that all frames
457 are key frames */
458 pkt->flags |= PKT_FLAG_KEY;
459 }
460 } else {
461 pkt->flags |= PKT_FLAG_KEY;
462 }
463 if(ast->sample_size)
464 ast->frame_offset += pkt->size;
465 else
466 ast->frame_offset++;
467 }
468 ast->remaining -= size;
469 if(!ast->remaining){
470 avi->stream_index= -1;
471 ast->packet_size= 0;
472 if (size & 1) {
473 get_byte(pb);
474 size++;
475 }
476 }
477
478 return size;
479 }
480
481 memset(d, -1, sizeof(int)*8);
482 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
483 int j;
484
485 if (i >= avi->movi_end) {
486 if (avi->is_odml) {
487 url_fskip(pb, avi->riff_end - i);
488 avi->riff_end = avi->movi_end = url_fsize(pb);
489 } else
490 break;
491 }
492
493 for(j=0; j<7; j++)
494 d[j]= d[j+1];
495 d[7]= get_byte(pb);
496
497 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
498
499 if( d[2] >= '0' && d[2] <= '9'
500 && d[3] >= '0' && d[3] <= '9'){
501 n= (d[2] - '0') * 10 + (d[3] - '0');
502 }else{
503 n= 100; //invalid stream id
504 }
505 //av_log(NULL, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %lld %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
506 if(i + size > avi->movi_end || d[0]<0)
507 continue;
508
509 //parse ix##
510 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
511 //parse JUNK
512 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')){
513 url_fskip(pb, size);
514 //av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
515 goto resync;
516 }
517
518 if( d[0] >= '0' && d[0] <= '9'
519 && d[1] >= '0' && d[1] <= '9'){
520 n= (d[0] - '0') * 10 + (d[1] - '0');
521 }else{
522 n= 100; //invalid stream id
523 }
524
525 //parse ##dc/##wb
526 if(n < s->nb_streams){
527 AVStream *st;
528 AVIStream *ast;
529 st = s->streams[n];
530 ast = st->priv_data;
531
532 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
533 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
534 || st->discard >= AVDISCARD_ALL){
535 if(ast->sample_size) ast->frame_offset += pkt->size;
536 else ast->frame_offset++;
537 url_fskip(pb, size);
538 goto resync;
539 }
540
541 if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
542 d[2]*256+d[3] == ast->prefix /*||
543 (d[2] == 'd' && d[3] == 'c') ||
544 (d[2] == 'w' && d[3] == 'b')*/) {
545
546 //av_log(NULL, AV_LOG_DEBUG, "OK\n");
547 if(d[2]*256+d[3] == ast->prefix)
548 ast->prefix_count++;
549 else{
550 ast->prefix= d[2]*256+d[3];
551 ast->prefix_count= 0;
552 }
553
554 avi->stream_index= n;
555 ast->packet_size= size + 8;
556 ast->remaining= size;
557 goto resync;
558 }
559 }
560 /* palette changed chunk */
561 if ( d[0] >= '0' && d[0] <= '9'
562 && d[1] >= '0' && d[1] <= '9'
563 && ((d[2] == 'p' && d[3] == 'c'))
564 && n < s->nb_streams && i + size <= avi->movi_end) {
565
566 AVStream *st;
567 int first, clr, flags, k, p;
568
569 st = s->streams[n];
570
571 first = get_byte(pb);
572 clr = get_byte(pb);
573 if(!clr) /* all 256 colors used */
574 clr = 256;
575 flags = get_le16(pb);
576 p = 4;
577 for (k = first; k < clr + first; k++) {
578 int r, g, b;
579 r = get_byte(pb);
580 g = get_byte(pb);
581 b = get_byte(pb);
582 get_byte(pb);
583 st->codec->palctrl->palette[k] = b + (g << 8) + (r << 16);
584 }
585 st->codec->palctrl->palette_changed = 1;
586 goto resync;
587 }
588
589 }
590
591 return -1;
592 }
593
594 /* XXX: we make the implicit supposition that the position are sorted
595 for each stream */
596 static int avi_read_idx1(AVFormatContext *s, int size)
597 {
598 AVIContext *avi = s->priv_data;
599 ByteIOContext *pb = &s->pb;
600 int nb_index_entries, i;
601 AVStream *st;
602 AVIStream *ast;
603 unsigned int index, tag, flags, pos, len;
604 unsigned last_pos= -1;
605
606 nb_index_entries = size / 16;
607 if (nb_index_entries <= 0)
608 return -1;
609
610 /* read the entries and sort them in each stream component */
611 for(i = 0; i < nb_index_entries; i++) {
612 tag = get_le32(pb);
613 flags = get_le32(pb);
614 pos = get_le32(pb);
615 len = get_le32(pb);
616 #if defined(DEBUG_SEEK)
617 av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
618 i, tag, flags, pos, len);
619 #endif
620 if(i==0 && pos > avi->movi_list)
621 avi->movi_list= 0; //FIXME better check
622
623 index = ((tag & 0xff) - '0') * 10;
624 index += ((tag >> 8) & 0xff) - '0';
625 if (index >= s->nb_streams)
626 continue;
627 st = s->streams[index];
628 ast = st->priv_data;
629
630 #if defined(DEBUG_SEEK)
631 av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%d\n", len, ast->cum_len);
632 #endif
633 if(last_pos == pos)
634 avi->non_interleaved= 1;
635 else
636 av_add_index_entry(st, pos, ast->cum_len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
637 if(ast->sample_size)
638 ast->cum_len += len / ast->sample_size;
639 else
640 ast->cum_len ++;
641 last_pos= pos;
642 }
643 return 0;
644 }
645
646 static int guess_ni_flag(AVFormatContext *s){
647 AVIContext *avi = s->priv_data;
648 int i;
649 int64_t last_start=0;
650 int64_t first_end= INT64_MAX;
651
652 for(i=0; i<s->nb_streams; i++){
653 AVStream *st = s->streams[i];
654 AVIStream *ast = st->priv_data;
655 int n= st->nb_index_entries;
656
657 if(n <= 0)
658 continue;
659
660 if(st->index_entries[0].pos > last_start)
661 last_start= st->index_entries[0].pos;
662 if(st->index_entries[n-1].pos < first_end)
663 first_end= st->index_entries[n-1].pos;
664 }
665 return last_start > first_end;
666 }
667
668 static int avi_load_index(AVFormatContext *s)
669 {
670 AVIContext *avi = s->priv_data;
671 ByteIOContext *pb = &s->pb;
672 uint32_t tag, size;
673 offset_t pos= url_ftell(pb);
674
675 url_fseek(pb, avi->movi_end, SEEK_SET);
676 #ifdef DEBUG_SEEK
677 printf("movi_end=0x%llx\n", avi->movi_end);
678 #endif
679 for(;;) {
680 if (url_feof(pb))
681 break;
682 tag = get_le32(pb);
683 size = get_le32(pb);
684 #ifdef DEBUG_SEEK
685 printf("tag=%c%c%c%c size=0x%x\n",
686 tag & 0xff,
687 (tag >> 8) & 0xff,
688 (tag >> 16) & 0xff,
689 (tag >> 24) & 0xff,
690 size);
691 #endif
692 switch(tag) {
693 case MKTAG('i', 'd', 'x', '1'):
694 if (avi_read_idx1(s, size) < 0)
695 goto skip;
696 else
697 goto the_end;
698 break;
699 default:
700 skip:
701 size += (size & 1);
702 url_fskip(pb, size);
703 break;
704 }
705 }
706 the_end:
707 avi->non_interleaved |= guess_ni_flag(s);
708 url_fseek(pb, pos, SEEK_SET);
709 return 0;
710 }
711
712 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
713 {
714 AVIContext *avi = s->priv_data;
715 AVStream *st;
716 int i, index;
717 int64_t pos;
718
719 if (!avi->index_loaded) {
720 /* we only load the index on demand */
721 avi_load_index(s);
722 avi->index_loaded = 1;
723 }
724 assert(stream_index>= 0);
725
726 st = s->streams[stream_index];
727 index= av_index_search_timestamp(st, timestamp, flags);
728 if(index<0)
729 return -1;
730
731 /* find the position */
732 pos = st->index_entries[index].pos;
733 timestamp = st->index_entries[index].timestamp;
734
735 // av_log(NULL, AV_LOG_DEBUG, "XX %Ld %d %Ld\n", timestamp, index, st->index_entries[index].timestamp);
736
737 for(i = 0; i < s->nb_streams; i++) {
738 AVStream *st2 = s->streams[i];
739 AVIStream *ast2 = st2->priv_data;
740
741 ast2->packet_size=
742 ast2->remaining= 0;
743
744 if (st2->nb_index_entries <= 0)
745 continue;
746
747 // assert(st2->codec.block_align);
748 assert(st2->time_base.den == ast2->rate);
749 assert(st2->time_base.num == ast2->scale);
750 index = av_index_search_timestamp(
751 st2,
752 av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
753 flags | AVSEEK_FLAG_BACKWARD);
754 if(index<0)
755 index=0;
756
757 if(!avi->non_interleaved){
758 while(index>0 && st2->index_entries[index].pos > pos)
759 index--;
760 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
761 index++;
762 }
763
764 // av_log(NULL, AV_LOG_DEBUG, "%Ld %d %Ld\n", timestamp, index, st2->index_entries[index].timestamp);
765 /* extract the current frame number */
766 ast2->frame_offset = st2->index_entries[index].timestamp;
767 if(ast2->sample_size)
768 ast2->frame_offset *=ast2->sample_size;
769 }
770
771 if (avi->dv_demux)
772 dv_flush_audio_packets(avi->dv_demux);
773 /* do the seek */
774 pos += avi->movi_list;
775 url_fseek(&s->pb, pos, SEEK_SET);
776 avi->stream_index= -1;
777 return 0;
778 }
779
780 static int avi_read_close(AVFormatContext *s)
781 {
782 int i;
783 AVIContext *avi = s->priv_data;
784
785 for(i=0;i<s->nb_streams;i++) {
786 AVStream *st = s->streams[i];
787 AVIStream *ast = st->priv_data;
788 av_free(ast);
789 av_free(st->codec->extradata);
790 av_free(st->codec->palctrl);
791 }
792
793 if (avi->dv_demux)
794 av_free(avi->dv_demux);
795
796 return 0;
797 }
798
799 static int avi_probe(AVProbeData *p)
800 {
801 /* check file header */
802 if (p->buf_size <= 32)
803 return 0;
804 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
805 p->buf[2] == 'F' && p->buf[3] == 'F' &&
806 p->buf[8] == 'A' && p->buf[9] == 'V' &&
807 p->buf[10] == 'I' && p->buf[11] == ' ')
808 return AVPROBE_SCORE_MAX;
809 else
810 return 0;
811 }
812
813 static AVInputFormat avi_iformat = {
814 "avi",
815 "avi format",
816 sizeof(AVIContext),
817 avi_probe,
818 avi_read_header,
819 avi_read_packet,
820 avi_read_close,
821 avi_read_seek,
822 };
823
824 int avidec_init(void)
825 {
826 av_register_input_format(&avi_iformat);
827 return 0;
828 }