85e819c9b697876212b2b77ca9d5fe8a9ee7b2f6
[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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
38
39 int64_t cum_len; /* temporary storage (used during seek) */
40
41 int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
42 int prefix_count;
43 } AVIStream;
44
45 typedef struct {
46 int64_t riff_end;
47 int64_t movi_end;
48 offset_t movi_list;
49 int index_loaded;
50 int is_odml;
51 int non_interleaved;
52 int stream_index;
53 DVDemuxContext* dv_demux;
54 } AVIContext;
55
56 static int avi_load_index(AVFormatContext *s);
57 static int guess_ni_flag(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 read_braindead_odml_indx(AVFormatContext *s, int frame_num){
89 AVIContext *avi = s->priv_data;
90 ByteIOContext *pb = &s->pb;
91 int longs_pre_entry= get_le16(pb);
92 int index_sub_type = get_byte(pb);
93 int index_type = get_byte(pb);
94 int entries_in_use = get_le32(pb);
95 int chunk_id = get_le32(pb);
96 int64_t base = get_le64(pb);
97 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
98 AVStream *st;
99 AVIStream *ast;
100 int i;
101 int64_t last_pos= -1;
102
103 // av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%Ld\n",
104 // longs_pre_entry,index_type, entries_in_use, chunk_id, base);
105
106 if(stream_id > s->nb_streams || stream_id < 0)
107 return -1;
108 st= s->streams[stream_id];
109 ast = st->priv_data;
110
111 if(index_sub_type)
112 return -1;
113
114 get_le32(pb);
115
116 if(index_type && longs_pre_entry != 2)
117 return -1;
118 if(index_type>1)
119 return -1;
120
121 for(i=0; i<entries_in_use; i++){
122 if(index_type){
123 int64_t pos= get_le32(pb) + base - 8;
124 int len = get_le32(pb);
125 int key= len >= 0;
126 len &= 0x7FFFFFFF;
127
128 //av_log(s, AV_LOG_ERROR, "pos:%Ld, len:%X\n", pos, len);
129 if(last_pos == pos || pos == base - 8)
130 avi->non_interleaved= 1;
131 else
132 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
133
134 if(ast->sample_size)
135 ast->cum_len += len / ast->sample_size;
136 else
137 ast->cum_len ++;
138 last_pos= pos;
139 }else{
140 int64_t offset= get_le64(pb);
141 int size = get_le32(pb);
142 int duration = get_le32(pb);
143 int64_t pos= url_ftell(pb);
144
145 url_fseek(pb, offset+8, SEEK_SET);
146 read_braindead_odml_indx(s, frame_num);
147 frame_num += duration;
148
149 url_fseek(pb, pos, SEEK_SET);
150 }
151 }
152 return 0;
153 }
154
155 static void clean_index(AVFormatContext *s){
156 int i, j;
157
158 for(i=0; i<s->nb_streams; i++){
159 AVStream *st = s->streams[i];
160 AVIStream *ast = st->priv_data;
161 int n= st->nb_index_entries;
162 int max= ast->sample_size;
163 int64_t pos, size, ts;
164
165 if(n != 1 || ast->sample_size==0)
166 continue;
167
168 while(max < 1024) max+=max;
169
170 pos= st->index_entries[0].pos;
171 size= st->index_entries[0].size;
172 ts= st->index_entries[0].timestamp;
173
174 for(j=0; j<size; j+=max){
175 av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
176 }
177 }
178 }
179
180 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
181 {
182 AVIContext *avi = s->priv_data;
183 ByteIOContext *pb = &s->pb;
184 uint32_t tag, tag1, handler;
185 int codec_type, stream_index, frame_period, bit_rate;
186 unsigned int size, nb_frames;
187 int i, n;
188 AVStream *st;
189 AVIStream *ast;
190 int xan_video = 0; /* hack to support Xan A/V */
191
192 avi->stream_index= -1;
193
194 if (get_riff(avi, pb) < 0)
195 return -1;
196
197 /* first list tag */
198 stream_index = -1;
199 codec_type = -1;
200 frame_period = 0;
201 for(;;) {
202 if (url_feof(pb))
203 goto fail;
204 tag = get_le32(pb);
205 size = get_le32(pb);
206 #ifdef DEBUG
207 print_tag("tag", tag, size);
208 #endif
209
210 switch(tag) {
211 case MKTAG('L', 'I', 'S', 'T'):
212 /* ignored, except when start of video packets */
213 tag1 = get_le32(pb);
214 #ifdef DEBUG
215 print_tag("list", tag1, 0);
216 #endif
217 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
218 avi->movi_list = url_ftell(pb) - 4;
219 if(size) avi->movi_end = avi->movi_list + size;
220 else avi->movi_end = url_fsize(pb);
221 #ifdef DEBUG
222 printf("movi end=%Lx\n", avi->movi_end);
223 #endif
224 goto end_of_header;
225 }
226 break;
227 case MKTAG('d', 'm', 'l', 'h'):
228 avi->is_odml = 1;
229 url_fskip(pb, size + (size & 1));
230 break;
231 case MKTAG('a', 'v', 'i', 'h'):
232 /* avi header */
233 /* using frame_period is bad idea */
234 frame_period = get_le32(pb);
235 bit_rate = get_le32(pb) * 8;
236 get_le32(pb);
237 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
238
239 url_fskip(pb, 2 * 4);
240 n = get_le32(pb);
241 for(i=0;i<n;i++) {
242 AVIStream *ast;
243 st = av_new_stream(s, i);
244 if (!st)
245 goto fail;
246
247 ast = av_mallocz(sizeof(AVIStream));
248 if (!ast)
249 goto fail;
250 st->priv_data = ast;
251 }
252 url_fskip(pb, size - 7 * 4);
253 break;
254 case MKTAG('s', 't', 'r', 'h'):
255 /* stream header */
256 stream_index++;
257 tag1 = get_le32(pb);
258 handler = get_le32(pb); /* codec tag */
259 #ifdef DEBUG
260 print_tag("strh", tag1, -1);
261 #endif
262 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
263 /*
264 * After some consideration -- I don't think we
265 * have to support anything but DV in a type1 AVIs.
266 */
267 if (s->nb_streams != 1)
268 goto fail;
269
270 if (handler != MKTAG('d', 'v', 's', 'd') &&
271 handler != MKTAG('d', 'v', 'h', 'd') &&
272 handler != MKTAG('d', 'v', 's', 'l'))
273 goto fail;
274
275 ast = s->streams[0]->priv_data;
276 av_freep(&s->streams[0]->codec->extradata);
277 av_freep(&s->streams[0]);
278 s->nb_streams = 0;
279 avi->dv_demux = dv_init_demux(s);
280 if (!avi->dv_demux)
281 goto fail;
282 s->streams[0]->priv_data = ast;
283 url_fskip(pb, 3 * 4);
284 ast->scale = get_le32(pb);
285 ast->rate = get_le32(pb);
286 stream_index = s->nb_streams - 1;
287 url_fskip(pb, size - 7*4);
288 break;
289 }
290
291 if (stream_index >= s->nb_streams) {
292 url_fskip(pb, size - 8);
293 /* ignore padding stream */
294 if (tag1 == MKTAG('p', 'a', 'd', 's'))
295 stream_index--;
296 break;
297 }
298 st = s->streams[stream_index];
299 ast = st->priv_data;
300 st->codec->stream_codec_tag= handler;
301
302 get_le32(pb); /* flags */
303 get_le16(pb); /* priority */
304 get_le16(pb); /* language */
305 get_le32(pb); /* initial frame */
306 ast->scale = get_le32(pb);
307 ast->rate = get_le32(pb);
308 if(ast->scale && ast->rate){
309 }else if(frame_period){
310 ast->rate = 1000000;
311 ast->scale = frame_period;
312 }else{
313 ast->rate = 25;
314 ast->scale = 1;
315 }
316 av_set_pts_info(st, 64, ast->scale, ast->rate);
317
318 ast->cum_len=get_le32(pb); /* start */
319 nb_frames = get_le32(pb);
320
321 st->start_time = 0;
322 st->duration = nb_frames;
323 get_le32(pb); /* buffer size */
324 get_le32(pb); /* quality */
325 ast->sample_size = get_le32(pb); /* sample ssize */
326 // av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
327
328 switch(tag1) {
329 case MKTAG('v', 'i', 'd', 's'):
330 codec_type = CODEC_TYPE_VIDEO;
331
332 ast->sample_size = 0;
333 break;
334 case MKTAG('a', 'u', 'd', 's'):
335 codec_type = CODEC_TYPE_AUDIO;
336 break;
337 case MKTAG('t', 'x', 't', 's'):
338 //FIXME
339 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
340 break;
341 case MKTAG('p', 'a', 'd', 's'):
342 codec_type = CODEC_TYPE_UNKNOWN;
343 stream_index--;
344 break;
345 default:
346 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
347 goto fail;
348 }
349 ast->frame_offset= ast->cum_len * FFMAX(ast->sample_size, 1);
350 url_fskip(pb, size - 12 * 4);
351 break;
352 case MKTAG('s', 't', 'r', 'f'):
353 /* stream header */
354 if (stream_index >= s->nb_streams || avi->dv_demux) {
355 url_fskip(pb, size);
356 } else {
357 st = s->streams[stream_index];
358 switch(codec_type) {
359 case CODEC_TYPE_VIDEO:
360 get_le32(pb); /* size */
361 st->codec->width = get_le32(pb);
362 st->codec->height = get_le32(pb);
363 get_le16(pb); /* panes */
364 st->codec->bits_per_sample= get_le16(pb); /* depth */
365 tag1 = get_le32(pb);
366 get_le32(pb); /* ImageSize */
367 get_le32(pb); /* XPelsPerMeter */
368 get_le32(pb); /* YPelsPerMeter */
369 get_le32(pb); /* ClrUsed */
370 get_le32(pb); /* ClrImportant */
371
372 if(size > 10*4 && size<(1<<30)){
373 st->codec->extradata_size= size - 10*4;
374 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
375 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
376 }
377
378 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
379 get_byte(pb);
380
381 /* Extract palette from extradata if bpp <= 8 */
382 /* This code assumes that extradata contains only palette */
383 /* This is true for all paletted codecs implemented in ffmpeg */
384 if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
385 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
386 #ifdef WORDS_BIGENDIAN
387 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
388 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
389 #else
390 memcpy(st->codec->palctrl->palette, st->codec->extradata,
391 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
392 #endif
393 st->codec->palctrl->palette_changed = 1;
394 }
395
396 #ifdef DEBUG
397 print_tag("video", tag1, 0);
398 #endif
399 st->codec->codec_type = CODEC_TYPE_VIDEO;
400 st->codec->codec_tag = tag1;
401 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
402 if (st->codec->codec_id == CODEC_ID_XAN_WC4)
403 xan_video = 1;
404 st->need_parsing = 2; //only parse headers dont do slower repacketization, this is needed to get the pict type which is needed for generating correct pts
405 // url_fskip(pb, size - 5 * 4);
406 break;
407 case CODEC_TYPE_AUDIO:
408 get_wav_header(pb, st->codec, size);
409 if(ast->sample_size && st->codec->block_align && ast->sample_size % st->codec->block_align)
410 av_log(s, AV_LOG_DEBUG, "invalid sample size or block align detected\n");
411 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
412 url_fskip(pb, 1);
413 /* special case time: To support Xan DPCM, hardcode
414 * the format if Xxan is the video codec */
415 st->need_parsing = 1;
416 /* force parsing as several audio frames can be in
417 one packet */
418 if (xan_video)
419 st->codec->codec_id = CODEC_ID_XAN_DPCM;
420 break;
421 default:
422 st->codec->codec_type = CODEC_TYPE_DATA;
423 st->codec->codec_id= CODEC_ID_NONE;
424 st->codec->codec_tag= 0;
425 url_fskip(pb, size);
426 break;
427 }
428 }
429 break;
430 case MKTAG('i', 'n', 'd', 'x'):
431 i= url_ftell(pb);
432 if(!url_is_streamed(pb)){
433 read_braindead_odml_indx(s, 0);
434 avi->index_loaded=1;
435 }
436 url_fseek(pb, i+size, SEEK_SET);
437 break;
438 default:
439 /* skip tag */
440 size += (size & 1);
441 url_fskip(pb, size);
442 break;
443 }
444 }
445 end_of_header:
446 /* check stream number */
447 if (stream_index != s->nb_streams - 1) {
448 fail:
449 for(i=0;i<s->nb_streams;i++) {
450 av_freep(&s->streams[i]->codec->extradata);
451 av_freep(&s->streams[i]);
452 }
453 return -1;
454 }
455
456 if(!avi->index_loaded && !url_is_streamed(pb))
457 avi_load_index(s);
458 avi->index_loaded = 1;
459 avi->non_interleaved |= guess_ni_flag(s);
460 if(avi->non_interleaved)
461 clean_index(s);
462
463 return 0;
464 }
465
466 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
467 {
468 AVIContext *avi = s->priv_data;
469 ByteIOContext *pb = &s->pb;
470 int n, d[8], size;
471 offset_t i, sync;
472 void* dstr;
473
474 if (avi->dv_demux) {
475 size = dv_get_packet(avi->dv_demux, pkt);
476 if (size >= 0)
477 return size;
478 }
479
480 if(avi->non_interleaved){
481 int best_stream_index = 0;
482 AVStream *best_st= NULL;
483 AVIStream *best_ast;
484 int64_t best_ts= INT64_MAX;
485 int i;
486
487 for(i=0; i<s->nb_streams; i++){
488 AVStream *st = s->streams[i];
489 AVIStream *ast = st->priv_data;
490 int64_t ts= ast->frame_offset;
491
492 if(ast->sample_size)
493 ts /= ast->sample_size;
494 ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
495
496 // av_log(NULL, AV_LOG_DEBUG, "%Ld %d/%d %Ld\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
497 if(ts < best_ts){
498 best_ts= ts;
499 best_st= st;
500 best_stream_index= i;
501 }
502 }
503 best_ast = best_st->priv_data;
504 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
505 if(best_ast->remaining)
506 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
507 else
508 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
509
510 // av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
511 if(i>=0){
512 int64_t pos= best_st->index_entries[i].pos;
513 pos += best_ast->packet_size - best_ast->remaining;
514 url_fseek(&s->pb, pos + 8, SEEK_SET);
515 // av_log(NULL, AV_LOG_DEBUG, "pos=%Ld\n", pos);
516
517 assert(best_ast->remaining <= best_ast->packet_size);
518
519 avi->stream_index= best_stream_index;
520 if(!best_ast->remaining)
521 best_ast->packet_size=
522 best_ast->remaining= best_st->index_entries[i].size;
523 }
524 }
525
526 resync:
527 if(avi->stream_index >= 0){
528 AVStream *st= s->streams[ avi->stream_index ];
529 AVIStream *ast= st->priv_data;
530 int size;
531
532 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
533 size= INT_MAX;
534 else if(ast->sample_size < 32)
535 size= 64*ast->sample_size;
536 else
537 size= ast->sample_size;
538
539 if(size > ast->remaining)
540 size= ast->remaining;
541 av_get_packet(pb, pkt, size);
542
543 if (avi->dv_demux) {
544 dstr = pkt->destruct;
545 size = dv_produce_packet(avi->dv_demux, pkt,
546 pkt->data, pkt->size);
547 pkt->destruct = dstr;
548 pkt->flags |= PKT_FLAG_KEY;
549 } else {
550 /* XXX: how to handle B frames in avi ? */
551 pkt->dts = ast->frame_offset;
552 // pkt->dts += ast->start;
553 if(ast->sample_size)
554 pkt->dts /= ast->sample_size;
555 //av_log(NULL, AV_LOG_DEBUG, "dts:%Ld offset:%Ld %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);
556 pkt->stream_index = avi->stream_index;
557
558 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
559 if(st->index_entries){
560 AVIndexEntry *e;
561 int index;
562
563 index= av_index_search_timestamp(st, pkt->dts, 0);
564 e= &st->index_entries[index];
565
566 if(index >= 0 && e->timestamp == ast->frame_offset){
567 if (e->flags & AVINDEX_KEYFRAME)
568 pkt->flags |= PKT_FLAG_KEY;
569 }
570 } else {
571 /* if no index, better to say that all frames
572 are key frames */
573 pkt->flags |= PKT_FLAG_KEY;
574 }
575 } else {
576 pkt->flags |= PKT_FLAG_KEY;
577 }
578 if(ast->sample_size)
579 ast->frame_offset += pkt->size;
580 else
581 ast->frame_offset++;
582 }
583 ast->remaining -= size;
584 if(!ast->remaining){
585 avi->stream_index= -1;
586 ast->packet_size= 0;
587 if (size & 1) {
588 get_byte(pb);
589 size++;
590 }
591 }
592
593 return size;
594 }
595
596 memset(d, -1, sizeof(int)*8);
597 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
598 int j;
599
600 if (i >= avi->movi_end) {
601 if (avi->is_odml) {
602 url_fskip(pb, avi->riff_end - i);
603 avi->riff_end = avi->movi_end = url_fsize(pb);
604 } else
605 break;
606 }
607
608 for(j=0; j<7; j++)
609 d[j]= d[j+1];
610 d[7]= get_byte(pb);
611
612 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
613
614 if( d[2] >= '0' && d[2] <= '9'
615 && d[3] >= '0' && d[3] <= '9'){
616 n= (d[2] - '0') * 10 + (d[3] - '0');
617 }else{
618 n= 100; //invalid stream id
619 }
620 //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);
621 if(i + size > avi->movi_end || d[0]<0)
622 continue;
623
624 //parse ix##
625 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
626 //parse JUNK
627 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')){
628 url_fskip(pb, size);
629 //av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
630 goto resync;
631 }
632
633 if( d[0] >= '0' && d[0] <= '9'
634 && d[1] >= '0' && d[1] <= '9'){
635 n= (d[0] - '0') * 10 + (d[1] - '0');
636 }else{
637 n= 100; //invalid stream id
638 }
639
640 //parse ##dc/##wb
641 if(n < s->nb_streams){
642 AVStream *st;
643 AVIStream *ast;
644 st = s->streams[n];
645 ast = st->priv_data;
646
647 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
648 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
649 || st->discard >= AVDISCARD_ALL){
650 if(ast->sample_size) ast->frame_offset += pkt->size;
651 else ast->frame_offset++;
652 url_fskip(pb, size);
653 goto resync;
654 }
655
656 if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
657 d[2]*256+d[3] == ast->prefix /*||
658 (d[2] == 'd' && d[3] == 'c') ||
659 (d[2] == 'w' && d[3] == 'b')*/) {
660
661 //av_log(NULL, AV_LOG_DEBUG, "OK\n");
662 if(d[2]*256+d[3] == ast->prefix)
663 ast->prefix_count++;
664 else{
665 ast->prefix= d[2]*256+d[3];
666 ast->prefix_count= 0;
667 }
668
669 avi->stream_index= n;
670 ast->packet_size= size + 8;
671 ast->remaining= size;
672 goto resync;
673 }
674 }
675 /* palette changed chunk */
676 if ( d[0] >= '0' && d[0] <= '9'
677 && d[1] >= '0' && d[1] <= '9'
678 && ((d[2] == 'p' && d[3] == 'c'))
679 && n < s->nb_streams && i + size <= avi->movi_end) {
680
681 AVStream *st;
682 int first, clr, flags, k, p;
683
684 st = s->streams[n];
685
686 first = get_byte(pb);
687 clr = get_byte(pb);
688 if(!clr) /* all 256 colors used */
689 clr = 256;
690 flags = get_le16(pb);
691 p = 4;
692 for (k = first; k < clr + first; k++) {
693 int r, g, b;
694 r = get_byte(pb);
695 g = get_byte(pb);
696 b = get_byte(pb);
697 get_byte(pb);
698 st->codec->palctrl->palette[k] = b + (g << 8) + (r << 16);
699 }
700 st->codec->palctrl->palette_changed = 1;
701 goto resync;
702 }
703
704 }
705
706 return -1;
707 }
708
709 /* XXX: we make the implicit supposition that the position are sorted
710 for each stream */
711 static int avi_read_idx1(AVFormatContext *s, int size)
712 {
713 AVIContext *avi = s->priv_data;
714 ByteIOContext *pb = &s->pb;
715 int nb_index_entries, i;
716 AVStream *st;
717 AVIStream *ast;
718 unsigned int index, tag, flags, pos, len;
719 unsigned last_pos= -1;
720
721 nb_index_entries = size / 16;
722 if (nb_index_entries <= 0)
723 return -1;
724
725 /* read the entries and sort them in each stream component */
726 for(i = 0; i < nb_index_entries; i++) {
727 tag = get_le32(pb);
728 flags = get_le32(pb);
729 pos = get_le32(pb);
730 len = get_le32(pb);
731 #if defined(DEBUG_SEEK)
732 av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
733 i, tag, flags, pos, len);
734 #endif
735 if(i==0 && pos > avi->movi_list)
736 avi->movi_list= 0; //FIXME better check
737 pos += avi->movi_list;
738
739 index = ((tag & 0xff) - '0') * 10;
740 index += ((tag >> 8) & 0xff) - '0';
741 if (index >= s->nb_streams)
742 continue;
743 st = s->streams[index];
744 ast = st->priv_data;
745
746 #if defined(DEBUG_SEEK)
747 av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%d\n", len, ast->cum_len);
748 #endif
749 if(last_pos == pos)
750 avi->non_interleaved= 1;
751 else
752 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
753 if(ast->sample_size)
754 ast->cum_len += len / ast->sample_size;
755 else
756 ast->cum_len ++;
757 last_pos= pos;
758 }
759 return 0;
760 }
761
762 static int guess_ni_flag(AVFormatContext *s){
763 int i;
764 int64_t last_start=0;
765 int64_t first_end= INT64_MAX;
766
767 for(i=0; i<s->nb_streams; i++){
768 AVStream *st = s->streams[i];
769 int n= st->nb_index_entries;
770
771 if(n <= 0)
772 continue;
773
774 if(st->index_entries[0].pos > last_start)
775 last_start= st->index_entries[0].pos;
776 if(st->index_entries[n-1].pos < first_end)
777 first_end= st->index_entries[n-1].pos;
778 }
779 return last_start > first_end;
780 }
781
782 static int avi_load_index(AVFormatContext *s)
783 {
784 AVIContext *avi = s->priv_data;
785 ByteIOContext *pb = &s->pb;
786 uint32_t tag, size;
787 offset_t pos= url_ftell(pb);
788
789 url_fseek(pb, avi->movi_end, SEEK_SET);
790 #ifdef DEBUG_SEEK
791 printf("movi_end=0x%llx\n", avi->movi_end);
792 #endif
793 for(;;) {
794 if (url_feof(pb))
795 break;
796 tag = get_le32(pb);
797 size = get_le32(pb);
798 #ifdef DEBUG_SEEK
799 printf("tag=%c%c%c%c size=0x%x\n",
800 tag & 0xff,
801 (tag >> 8) & 0xff,
802 (tag >> 16) & 0xff,
803 (tag >> 24) & 0xff,
804 size);
805 #endif
806 switch(tag) {
807 case MKTAG('i', 'd', 'x', '1'):
808 if (avi_read_idx1(s, size) < 0)
809 goto skip;
810 else
811 goto the_end;
812 break;
813 default:
814 skip:
815 size += (size & 1);
816 url_fskip(pb, size);
817 break;
818 }
819 }
820 the_end:
821 url_fseek(pb, pos, SEEK_SET);
822 return 0;
823 }
824
825 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
826 {
827 AVIContext *avi = s->priv_data;
828 AVStream *st;
829 int i, index;
830 int64_t pos;
831
832 if (!avi->index_loaded) {
833 /* we only load the index on demand */
834 avi_load_index(s);
835 avi->index_loaded = 1;
836 }
837 assert(stream_index>= 0);
838
839 st = s->streams[stream_index];
840 index= av_index_search_timestamp(st, timestamp, flags);
841 if(index<0)
842 return -1;
843
844 /* find the position */
845 pos = st->index_entries[index].pos;
846 timestamp = st->index_entries[index].timestamp;
847
848 // av_log(NULL, AV_LOG_DEBUG, "XX %Ld %d %Ld\n", timestamp, index, st->index_entries[index].timestamp);
849
850 for(i = 0; i < s->nb_streams; i++) {
851 AVStream *st2 = s->streams[i];
852 AVIStream *ast2 = st2->priv_data;
853
854 ast2->packet_size=
855 ast2->remaining= 0;
856
857 if (st2->nb_index_entries <= 0)
858 continue;
859
860 // assert(st2->codec->block_align);
861 assert(st2->time_base.den == ast2->rate);
862 assert(st2->time_base.num == ast2->scale);
863 index = av_index_search_timestamp(
864 st2,
865 av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
866 flags | AVSEEK_FLAG_BACKWARD);
867 if(index<0)
868 index=0;
869
870 if(!avi->non_interleaved){
871 while(index>0 && st2->index_entries[index].pos > pos)
872 index--;
873 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
874 index++;
875 }
876
877 // av_log(NULL, AV_LOG_DEBUG, "%Ld %d %Ld\n", timestamp, index, st2->index_entries[index].timestamp);
878 /* extract the current frame number */
879 ast2->frame_offset = st2->index_entries[index].timestamp;
880 if(ast2->sample_size)
881 ast2->frame_offset *=ast2->sample_size;
882 }
883
884 if (avi->dv_demux)
885 dv_flush_audio_packets(avi->dv_demux);
886 /* do the seek */
887 url_fseek(&s->pb, pos, SEEK_SET);
888 avi->stream_index= -1;
889 return 0;
890 }
891
892 static int avi_read_close(AVFormatContext *s)
893 {
894 int i;
895 AVIContext *avi = s->priv_data;
896
897 for(i=0;i<s->nb_streams;i++) {
898 AVStream *st = s->streams[i];
899 AVIStream *ast = st->priv_data;
900 av_free(ast);
901 av_free(st->codec->extradata);
902 av_free(st->codec->palctrl);
903 }
904
905 if (avi->dv_demux)
906 av_free(avi->dv_demux);
907
908 return 0;
909 }
910
911 static int avi_probe(AVProbeData *p)
912 {
913 /* check file header */
914 if (p->buf_size <= 32)
915 return 0;
916 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
917 p->buf[2] == 'F' && p->buf[3] == 'F' &&
918 p->buf[8] == 'A' && p->buf[9] == 'V' &&
919 p->buf[10] == 'I' && p->buf[11] == ' ')
920 return AVPROBE_SCORE_MAX;
921 else
922 return 0;
923 }
924
925 static AVInputFormat avi_iformat = {
926 "avi",
927 "avi format",
928 sizeof(AVIContext),
929 avi_probe,
930 avi_read_header,
931 avi_read_packet,
932 avi_read_close,
933 avi_read_seek,
934 };
935
936 int avidec_init(void)
937 {
938 av_register_input_format(&avi_iformat);
939 return 0;
940 }