eaccd41fe5008a49e2782177865a1d7ec56a3f06
[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 #include "avformat.h"
22 #include "avi.h"
23 #include "dv.h"
24 #include "riff.h"
25
26 #undef NDEBUG
27 #include <assert.h>
28
29 //#define DEBUG
30 //#define DEBUG_SEEK
31
32 typedef struct AVIStream {
33 int64_t frame_offset; /* current frame (video) or byte (audio) counter
34 (used to compute the pts) */
35 int remaining;
36 int packet_size;
37
38 int scale;
39 int rate;
40 int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
41
42 int64_t cum_len; /* temporary storage (used during seek) */
43
44 int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
45 int prefix_count;
46 uint32_t pal[256];
47 int has_pal;
48 } AVIStream;
49
50 typedef struct {
51 int64_t riff_end;
52 int64_t movi_end;
53 int64_t fsize;
54 int64_t movi_list;
55 int64_t last_pkt_pos;
56 int index_loaded;
57 int is_odml;
58 int non_interleaved;
59 int stream_index;
60 DVDemuxContext* dv_demux;
61 } AVIContext;
62
63 static const char avi_headers[][8] = {
64 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
65 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
66 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
67 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
68 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
69 { 0 }
70 };
71
72 static int avi_load_index(AVFormatContext *s);
73 static int guess_ni_flag(AVFormatContext *s);
74
75 #ifdef DEBUG
76 static void print_tag(const char *str, unsigned int tag, int size)
77 {
78 printf("%s: tag=%c%c%c%c size=0x%x\n",
79 str, tag & 0xff,
80 (tag >> 8) & 0xff,
81 (tag >> 16) & 0xff,
82 (tag >> 24) & 0xff,
83 size);
84 }
85 #endif
86
87 static int get_riff(AVIContext *avi, ByteIOContext *pb)
88 {
89 char header[8];
90 int i;
91
92 /* check RIFF header */
93 get_buffer(pb, header, 4);
94 avi->riff_end = get_le32(pb); /* RIFF chunk size */
95 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
96 get_buffer(pb, header+4, 4);
97
98 for(i=0; avi_headers[i][0]; i++)
99 if(!memcmp(header, avi_headers[i], 8))
100 break;
101 if(!avi_headers[i][0])
102 return -1;
103
104 if(header[7] == 0x19)
105 av_log(NULL, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
106
107 return 0;
108 }
109
110 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
111 AVIContext *avi = s->priv_data;
112 ByteIOContext *pb = s->pb;
113 int longs_pre_entry= get_le16(pb);
114 int index_sub_type = get_byte(pb);
115 int index_type = get_byte(pb);
116 int entries_in_use = get_le32(pb);
117 int chunk_id = get_le32(pb);
118 int64_t base = get_le64(pb);
119 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
120 AVStream *st;
121 AVIStream *ast;
122 int i;
123 int64_t last_pos= -1;
124 int64_t filesize= url_fsize(s->pb);
125
126 #ifdef DEBUG_SEEK
127 av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
128 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
129 #endif
130
131 if(stream_id > s->nb_streams || stream_id < 0)
132 return -1;
133 st= s->streams[stream_id];
134 ast = st->priv_data;
135
136 if(index_sub_type)
137 return -1;
138
139 get_le32(pb);
140
141 if(index_type && longs_pre_entry != 2)
142 return -1;
143 if(index_type>1)
144 return -1;
145
146 if(filesize > 0 && base >= filesize){
147 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
148 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
149 base &= 0xFFFFFFFF;
150 else
151 return -1;
152 }
153
154 for(i=0; i<entries_in_use; i++){
155 if(index_type){
156 int64_t pos= get_le32(pb) + base - 8;
157 int len = get_le32(pb);
158 int key= len >= 0;
159 len &= 0x7FFFFFFF;
160
161 #ifdef DEBUG_SEEK
162 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
163 #endif
164 if(last_pos == pos || pos == base - 8)
165 avi->non_interleaved= 1;
166 else
167 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
168
169 if(ast->sample_size)
170 ast->cum_len += len;
171 else
172 ast->cum_len ++;
173 last_pos= pos;
174 }else{
175 int64_t offset, pos;
176 int duration;
177 offset = get_le64(pb);
178 get_le32(pb); /* size */
179 duration = get_le32(pb);
180 pos = url_ftell(pb);
181
182 url_fseek(pb, offset+8, SEEK_SET);
183 read_braindead_odml_indx(s, frame_num);
184 frame_num += duration;
185
186 url_fseek(pb, pos, SEEK_SET);
187 }
188 }
189 avi->index_loaded=1;
190 return 0;
191 }
192
193 static void clean_index(AVFormatContext *s){
194 int i;
195 int64_t j;
196
197 for(i=0; i<s->nb_streams; i++){
198 AVStream *st = s->streams[i];
199 AVIStream *ast = st->priv_data;
200 int n= st->nb_index_entries;
201 int max= ast->sample_size;
202 int64_t pos, size, ts;
203
204 if(n != 1 || ast->sample_size==0)
205 continue;
206
207 while(max < 1024) max+=max;
208
209 pos= st->index_entries[0].pos;
210 size= st->index_entries[0].size;
211 ts= st->index_entries[0].timestamp;
212
213 for(j=0; j<size; j+=max){
214 av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
215 }
216 }
217 }
218
219 static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen, unsigned int size)
220 {
221 int64_t i = url_ftell(pb);
222 size += (size & 1);
223 get_strz(pb, buf, maxlen);
224 url_fseek(pb, i+size, SEEK_SET);
225 return 0;
226 }
227
228 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
229 {
230 AVIContext *avi = s->priv_data;
231 ByteIOContext *pb = s->pb;
232 uint32_t tag, tag1, handler;
233 int codec_type, stream_index, frame_period, bit_rate;
234 unsigned int size, nb_frames;
235 int i;
236 AVStream *st;
237 AVIStream *ast = NULL;
238 char str_track[4];
239 int avih_width=0, avih_height=0;
240 int amv_file_format=0;
241
242 avi->stream_index= -1;
243
244 if (get_riff(avi, pb) < 0)
245 return -1;
246
247 avi->fsize = url_fsize(pb);
248 if(avi->fsize<=0)
249 avi->fsize= avi->riff_end;
250
251 /* first list tag */
252 stream_index = -1;
253 codec_type = -1;
254 frame_period = 0;
255 for(;;) {
256 if (url_feof(pb))
257 goto fail;
258 tag = get_le32(pb);
259 size = get_le32(pb);
260 #ifdef DEBUG
261 print_tag("tag", tag, size);
262 #endif
263
264 switch(tag) {
265 case MKTAG('L', 'I', 'S', 'T'):
266 /* Ignored, except at start of video packets. */
267 tag1 = get_le32(pb);
268 #ifdef DEBUG
269 print_tag("list", tag1, 0);
270 #endif
271 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
272 avi->movi_list = url_ftell(pb) - 4;
273 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
274 else avi->movi_end = url_fsize(pb);
275 #ifdef DEBUG
276 printf("movi end=%"PRIx64"\n", avi->movi_end);
277 #endif
278 goto end_of_header;
279 }
280 break;
281 case MKTAG('d', 'm', 'l', 'h'):
282 avi->is_odml = 1;
283 url_fskip(pb, size + (size & 1));
284 break;
285 case MKTAG('a', 'm', 'v', 'h'):
286 amv_file_format=1;
287 case MKTAG('a', 'v', 'i', 'h'):
288 /* AVI header */
289 /* using frame_period is bad idea */
290 frame_period = get_le32(pb);
291 bit_rate = get_le32(pb) * 8;
292 get_le32(pb);
293 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
294
295 url_fskip(pb, 2 * 4);
296 get_le32(pb);
297 get_le32(pb);
298 avih_width=get_le32(pb);
299 avih_height=get_le32(pb);
300
301 url_fskip(pb, size - 10 * 4);
302 break;
303 case MKTAG('s', 't', 'r', 'h'):
304 /* stream header */
305
306 tag1 = get_le32(pb);
307 handler = get_le32(pb); /* codec tag */
308
309 if(tag1 == MKTAG('p', 'a', 'd', 's')){
310 url_fskip(pb, size - 8);
311 break;
312 }else{
313 stream_index++;
314 st = av_new_stream(s, stream_index);
315 if (!st)
316 goto fail;
317
318 ast = av_mallocz(sizeof(AVIStream));
319 if (!ast)
320 goto fail;
321 st->priv_data = ast;
322 }
323 if(amv_file_format)
324 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
325
326 #ifdef DEBUG
327 print_tag("strh", tag1, -1);
328 #endif
329 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
330 int64_t dv_dur;
331
332 /*
333 * After some consideration -- I don't think we
334 * have to support anything but DV in type1 AVIs.
335 */
336 if (s->nb_streams != 1)
337 goto fail;
338
339 if (handler != MKTAG('d', 'v', 's', 'd') &&
340 handler != MKTAG('d', 'v', 'h', 'd') &&
341 handler != MKTAG('d', 'v', 's', 'l'))
342 goto fail;
343
344 ast = s->streams[0]->priv_data;
345 av_freep(&s->streams[0]->codec->extradata);
346 av_freep(&s->streams[0]);
347 s->nb_streams = 0;
348 if (ENABLE_DV_DEMUXER) {
349 avi->dv_demux = dv_init_demux(s);
350 if (!avi->dv_demux)
351 goto fail;
352 }
353 s->streams[0]->priv_data = ast;
354 url_fskip(pb, 3 * 4);
355 ast->scale = get_le32(pb);
356 ast->rate = get_le32(pb);
357 url_fskip(pb, 4); /* start time */
358
359 dv_dur = get_le32(pb);
360 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
361 dv_dur *= AV_TIME_BASE;
362 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
363 }
364 /*
365 * else, leave duration alone; timing estimation in utils.c
366 * will make a guess based on bitrate.
367 */
368
369 stream_index = s->nb_streams - 1;
370 url_fskip(pb, size - 9*4);
371 break;
372 }
373
374 assert(stream_index < s->nb_streams);
375 st->codec->stream_codec_tag= handler;
376
377 get_le32(pb); /* flags */
378 get_le16(pb); /* priority */
379 get_le16(pb); /* language */
380 get_le32(pb); /* initial frame */
381 ast->scale = get_le32(pb);
382 ast->rate = get_le32(pb);
383 if(!(ast->scale && ast->rate)){
384 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);
385 if(frame_period){
386 ast->rate = 1000000;
387 ast->scale = frame_period;
388 }else{
389 ast->rate = 25;
390 ast->scale = 1;
391 }
392 }
393 av_set_pts_info(st, 64, ast->scale, ast->rate);
394
395 ast->cum_len=get_le32(pb); /* start */
396 nb_frames = get_le32(pb);
397
398 st->start_time = 0;
399 st->duration = nb_frames;
400 get_le32(pb); /* buffer size */
401 get_le32(pb); /* quality */
402 ast->sample_size = get_le32(pb); /* sample ssize */
403 ast->cum_len *= FFMAX(1, ast->sample_size);
404 // av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
405
406 switch(tag1) {
407 case MKTAG('v', 'i', 'd', 's'):
408 codec_type = CODEC_TYPE_VIDEO;
409
410 ast->sample_size = 0;
411 break;
412 case MKTAG('a', 'u', 'd', 's'):
413 codec_type = CODEC_TYPE_AUDIO;
414 break;
415 case MKTAG('t', 'x', 't', 's'):
416 //FIXME
417 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
418 break;
419 case MKTAG('d', 'a', 't', 's'):
420 codec_type = CODEC_TYPE_DATA;
421 break;
422 default:
423 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
424 goto fail;
425 }
426 ast->frame_offset= ast->cum_len;
427 url_fskip(pb, size - 12 * 4);
428 break;
429 case MKTAG('s', 't', 'r', 'f'):
430 /* stream header */
431 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
432 url_fskip(pb, size);
433 } else {
434 st = s->streams[stream_index];
435 switch(codec_type) {
436 case CODEC_TYPE_VIDEO:
437 if(amv_file_format){
438 st->codec->width=avih_width;
439 st->codec->height=avih_height;
440 st->codec->codec_type = CODEC_TYPE_VIDEO;
441 st->codec->codec_id = CODEC_ID_AMV;
442 url_fskip(pb, size);
443 break;
444 }
445 get_le32(pb); /* size */
446 st->codec->width = get_le32(pb);
447 st->codec->height = get_le32(pb);
448 get_le16(pb); /* panes */
449 st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
450 tag1 = get_le32(pb);
451 get_le32(pb); /* ImageSize */
452 get_le32(pb); /* XPelsPerMeter */
453 get_le32(pb); /* YPelsPerMeter */
454 get_le32(pb); /* ClrUsed */
455 get_le32(pb); /* ClrImportant */
456
457 if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
458 st->codec->codec_type = CODEC_TYPE_SUBTITLE;
459 st->codec->codec_tag = tag1;
460 st->codec->codec_id = CODEC_ID_XSUB;
461 break;
462 }
463
464 if(size > 10*4 && size<(1<<30)){
465 st->codec->extradata_size= size - 10*4;
466 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
467 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
468 }
469
470 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
471 get_byte(pb);
472
473 /* Extract palette from extradata if bpp <= 8. */
474 /* This code assumes that extradata contains only palette. */
475 /* This is true for all paletted codecs implemented in FFmpeg. */
476 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
477 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
478 #ifdef WORDS_BIGENDIAN
479 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
480 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
481 #else
482 memcpy(st->codec->palctrl->palette, st->codec->extradata,
483 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
484 #endif
485 st->codec->palctrl->palette_changed = 1;
486 }
487
488 #ifdef DEBUG
489 print_tag("video", tag1, 0);
490 #endif
491 st->codec->codec_type = CODEC_TYPE_VIDEO;
492 st->codec->codec_tag = tag1;
493 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
494 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
495 // url_fskip(pb, size - 5 * 4);
496 break;
497 case CODEC_TYPE_AUDIO:
498 get_wav_header(pb, st->codec, size);
499 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
500 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
501 ast->sample_size= st->codec->block_align;
502 }
503 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
504 url_fskip(pb, 1);
505 /* Force parsing as several audio frames can be in
506 * one packet and timestamps refer to packet start. */
507 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
508 /* ADTS header is in extradata, AAC without header must be
509 * stored as exact frames. Parser not needed and it will
510 * fail. */
511 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
512 st->need_parsing = AVSTREAM_PARSE_NONE;
513 /* AVI files with Xan DPCM audio (wrongly) declare PCM
514 * audio in the header but have Axan as stream_code_tag. */
515 if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){
516 st->codec->codec_id = CODEC_ID_XAN_DPCM;
517 st->codec->codec_tag = 0;
518 }
519 if (amv_file_format)
520 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
521 break;
522 default:
523 st->codec->codec_type = CODEC_TYPE_DATA;
524 st->codec->codec_id= CODEC_ID_NONE;
525 st->codec->codec_tag= 0;
526 url_fskip(pb, size);
527 break;
528 }
529 }
530 break;
531 case MKTAG('i', 'n', 'd', 'x'):
532 i= url_ftell(pb);
533 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
534 read_braindead_odml_indx(s, 0);
535 }
536 url_fseek(pb, i+size, SEEK_SET);
537 break;
538 case MKTAG('v', 'p', 'r', 'p'):
539 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
540 AVRational active, active_aspect;
541
542 st = s->streams[stream_index];
543 get_le32(pb);
544 get_le32(pb);
545 get_le32(pb);
546 get_le32(pb);
547 get_le32(pb);
548
549 active_aspect.den= get_le16(pb);
550 active_aspect.num= get_le16(pb);
551 active.num = get_le32(pb);
552 active.den = get_le32(pb);
553 get_le32(pb); //nbFieldsPerFrame
554
555 if(active_aspect.num && active_aspect.den && active.num && active.den){
556 st->sample_aspect_ratio= av_div_q(active_aspect, active);
557 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
558 }
559 size -= 9*4;
560 }
561 url_fseek(pb, size, SEEK_CUR);
562 break;
563 case MKTAG('I', 'N', 'A', 'M'):
564 avi_read_tag(pb, s->title, sizeof(s->title), size);
565 break;
566 case MKTAG('I', 'A', 'R', 'T'):
567 avi_read_tag(pb, s->author, sizeof(s->author), size);
568 break;
569 case MKTAG('I', 'C', 'O', 'P'):
570 avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
571 break;
572 case MKTAG('I', 'C', 'M', 'T'):
573 avi_read_tag(pb, s->comment, sizeof(s->comment), size);
574 break;
575 case MKTAG('I', 'G', 'N', 'R'):
576 avi_read_tag(pb, s->genre, sizeof(s->genre), size);
577 break;
578 case MKTAG('I', 'P', 'R', 'D'):
579 avi_read_tag(pb, s->album, sizeof(s->album), size);
580 break;
581 case MKTAG('I', 'P', 'R', 'T'):
582 avi_read_tag(pb, str_track, sizeof(str_track), size);
583 sscanf(str_track, "%d", &s->track);
584 break;
585 default:
586 if(size > 1000000){
587 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
588 "I will ignore it and try to continue anyway.\n");
589 avi->movi_list = url_ftell(pb) - 4;
590 avi->movi_end = url_fsize(pb);
591 goto end_of_header;
592 }
593 /* skip tag */
594 size += (size & 1);
595 url_fskip(pb, size);
596 break;
597 }
598 }
599 end_of_header:
600 /* check stream number */
601 if (stream_index != s->nb_streams - 1) {
602 fail:
603 return -1;
604 }
605
606 if(!avi->index_loaded && !url_is_streamed(pb))
607 avi_load_index(s);
608 avi->index_loaded = 1;
609 avi->non_interleaved |= guess_ni_flag(s);
610 if(avi->non_interleaved) {
611 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
612 clean_index(s);
613 }
614
615 return 0;
616 }
617
618 static int get_stream_idx(int *d){
619 if( d[0] >= '0' && d[0] <= '9'
620 && d[1] >= '0' && d[1] <= '9'){
621 return (d[0] - '0') * 10 + (d[1] - '0');
622 }else{
623 return 100; //invalid stream ID
624 }
625 }
626
627 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
628 {
629 AVIContext *avi = s->priv_data;
630 ByteIOContext *pb = s->pb;
631 int n, d[8], size;
632 int64_t i, sync;
633 void* dstr;
634
635 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
636 size = dv_get_packet(avi->dv_demux, pkt);
637 if (size >= 0)
638 return size;
639 }
640
641 if(avi->non_interleaved){
642 int best_stream_index = 0;
643 AVStream *best_st= NULL;
644 AVIStream *best_ast;
645 int64_t best_ts= INT64_MAX;
646 int i;
647
648 for(i=0; i<s->nb_streams; i++){
649 AVStream *st = s->streams[i];
650 AVIStream *ast = st->priv_data;
651 int64_t ts= ast->frame_offset;
652
653 if(ast->sample_size)
654 ts /= ast->sample_size;
655 ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
656
657 // av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
658 if(ts < best_ts && st->nb_index_entries){
659 best_ts= ts;
660 best_st= st;
661 best_stream_index= i;
662 }
663 }
664 if(!best_st)
665 return -1;
666
667 best_ast = best_st->priv_data;
668 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
669 if(best_ast->remaining)
670 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
671 else
672 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
673
674 // av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
675 if(i>=0){
676 int64_t pos= best_st->index_entries[i].pos;
677 pos += best_ast->packet_size - best_ast->remaining;
678 url_fseek(s->pb, pos + 8, SEEK_SET);
679 // av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
680
681 assert(best_ast->remaining <= best_ast->packet_size);
682
683 avi->stream_index= best_stream_index;
684 if(!best_ast->remaining)
685 best_ast->packet_size=
686 best_ast->remaining= best_st->index_entries[i].size;
687 }
688 }
689
690 resync:
691 if(avi->stream_index >= 0){
692 AVStream *st= s->streams[ avi->stream_index ];
693 AVIStream *ast= st->priv_data;
694 int size;
695
696 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
697 size= INT_MAX;
698 else if(ast->sample_size < 32)
699 size= 64*ast->sample_size;
700 else
701 size= ast->sample_size;
702
703 if(size > ast->remaining)
704 size= ast->remaining;
705 avi->last_pkt_pos= url_ftell(pb);
706 av_get_packet(pb, pkt, size);
707
708 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
709 ast->has_pal=0;
710 pkt->size += 4*256;
711 pkt->data = av_realloc(pkt->data, pkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
712 if(pkt->data)
713 memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
714 }
715
716 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
717 dstr = pkt->destruct;
718 size = dv_produce_packet(avi->dv_demux, pkt,
719 pkt->data, pkt->size);
720 pkt->destruct = dstr;
721 pkt->flags |= PKT_FLAG_KEY;
722 } else {
723 /* XXX: How to handle B-frames in AVI? */
724 pkt->dts = ast->frame_offset;
725 // pkt->dts += ast->start;
726 if(ast->sample_size)
727 pkt->dts /= ast->sample_size;
728 //av_log(NULL, 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);
729 pkt->stream_index = avi->stream_index;
730
731 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
732 AVIndexEntry *e;
733 int index;
734 assert(st->index_entries);
735
736 index= av_index_search_timestamp(st, pkt->dts, 0);
737 e= &st->index_entries[index];
738
739 if(index >= 0 && e->timestamp == ast->frame_offset){
740 if (e->flags & AVINDEX_KEYFRAME)
741 pkt->flags |= PKT_FLAG_KEY;
742 }
743 } else {
744 pkt->flags |= PKT_FLAG_KEY;
745 }
746 if(ast->sample_size)
747 ast->frame_offset += pkt->size;
748 else
749 ast->frame_offset++;
750 }
751 ast->remaining -= size;
752 if(!ast->remaining){
753 avi->stream_index= -1;
754 ast->packet_size= 0;
755 }
756
757 return size;
758 }
759
760 memset(d, -1, sizeof(int)*8);
761 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
762 int j;
763
764 for(j=0; j<7; j++)
765 d[j]= d[j+1];
766 d[7]= get_byte(pb);
767
768 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
769
770 n= get_stream_idx(d+2);
771 //av_log(NULL, 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);
772 if(i + size > avi->fsize || d[0]<0)
773 continue;
774
775 //parse ix##
776 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
777 //parse JUNK
778 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
779 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
780 url_fskip(pb, size);
781 //av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
782 goto resync;
783 }
784
785 n= get_stream_idx(d);
786
787 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
788 continue;
789
790 //parse ##dc/##wb
791 if(n < s->nb_streams){
792 AVStream *st;
793 AVIStream *ast;
794 st = s->streams[n];
795 ast = st->priv_data;
796
797 if(s->nb_streams>=2){
798 AVStream *st1 = s->streams[1];
799 AVIStream *ast1= st1->priv_data;
800 //workaround for broken small-file-bug402.avi
801 if( d[2] == 'w' && d[3] == 'b'
802 && n==0
803 && st ->codec->codec_type == CODEC_TYPE_VIDEO
804 && st1->codec->codec_type == CODEC_TYPE_AUDIO
805 && ast->prefix == 'd'*256+'c'
806 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
807 ){
808 n=1;
809 st = st1;
810 ast = ast1;
811 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
812 }
813 }
814
815
816 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
817 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
818 || st->discard >= AVDISCARD_ALL){
819 if(ast->sample_size) ast->frame_offset += pkt->size;
820 else ast->frame_offset++;
821 url_fskip(pb, size);
822 goto resync;
823 }
824
825 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
826 int k = get_byte(pb);
827 int last = (k + get_byte(pb) - 1) & 0xFF;
828
829 get_le16(pb); //flags
830
831 for (; k <= last; k++)
832 ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
833 ast->has_pal= 1;
834 goto resync;
835 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
836 d[2]*256+d[3] == ast->prefix /*||
837 (d[2] == 'd' && d[3] == 'c') ||
838 (d[2] == 'w' && d[3] == 'b')*/) {
839
840 //av_log(NULL, AV_LOG_DEBUG, "OK\n");
841 if(d[2]*256+d[3] == ast->prefix)
842 ast->prefix_count++;
843 else{
844 ast->prefix= d[2]*256+d[3];
845 ast->prefix_count= 0;
846 }
847
848 avi->stream_index= n;
849 ast->packet_size= size + 8;
850 ast->remaining= size;
851
852 {
853 uint64_t pos= url_ftell(pb) - 8;
854 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
855 av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
856 }
857 }
858 goto resync;
859 }
860 }
861 }
862
863 return -1;
864 }
865
866 /* XXX: We make the implicit supposition that the positions are sorted
867 for each stream. */
868 static int avi_read_idx1(AVFormatContext *s, int size)
869 {
870 AVIContext *avi = s->priv_data;
871 ByteIOContext *pb = s->pb;
872 int nb_index_entries, i;
873 AVStream *st;
874 AVIStream *ast;
875 unsigned int index, tag, flags, pos, len;
876 unsigned last_pos= -1;
877
878 nb_index_entries = size / 16;
879 if (nb_index_entries <= 0)
880 return -1;
881
882 /* Read the entries and sort them in each stream component. */
883 for(i = 0; i < nb_index_entries; i++) {
884 tag = get_le32(pb);
885 flags = get_le32(pb);
886 pos = get_le32(pb);
887 len = get_le32(pb);
888 #if defined(DEBUG_SEEK)
889 av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
890 i, tag, flags, pos, len);
891 #endif
892 if(i==0 && pos > avi->movi_list)
893 avi->movi_list= 0; //FIXME better check
894 pos += avi->movi_list;
895
896 index = ((tag & 0xff) - '0') * 10;
897 index += ((tag >> 8) & 0xff) - '0';
898 if (index >= s->nb_streams)
899 continue;
900 st = s->streams[index];
901 ast = st->priv_data;
902
903 #if defined(DEBUG_SEEK)
904 av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
905 #endif
906 if(last_pos == pos)
907 avi->non_interleaved= 1;
908 else
909 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
910 if(ast->sample_size)
911 ast->cum_len += len;
912 else
913 ast->cum_len ++;
914 last_pos= pos;
915 }
916 return 0;
917 }
918
919 static int guess_ni_flag(AVFormatContext *s){
920 int i;
921 int64_t last_start=0;
922 int64_t first_end= INT64_MAX;
923
924 for(i=0; i<s->nb_streams; i++){
925 AVStream *st = s->streams[i];
926 int n= st->nb_index_entries;
927
928 if(n <= 0)
929 continue;
930
931 if(st->index_entries[0].pos > last_start)
932 last_start= st->index_entries[0].pos;
933 if(st->index_entries[n-1].pos < first_end)
934 first_end= st->index_entries[n-1].pos;
935 }
936 return last_start > first_end;
937 }
938
939 static int avi_load_index(AVFormatContext *s)
940 {
941 AVIContext *avi = s->priv_data;
942 ByteIOContext *pb = s->pb;
943 uint32_t tag, size;
944 int64_t pos= url_ftell(pb);
945
946 url_fseek(pb, avi->movi_end, SEEK_SET);
947 #ifdef DEBUG_SEEK
948 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
949 #endif
950 for(;;) {
951 if (url_feof(pb))
952 break;
953 tag = get_le32(pb);
954 size = get_le32(pb);
955 #ifdef DEBUG_SEEK
956 printf("tag=%c%c%c%c size=0x%x\n",
957 tag & 0xff,
958 (tag >> 8) & 0xff,
959 (tag >> 16) & 0xff,
960 (tag >> 24) & 0xff,
961 size);
962 #endif
963 switch(tag) {
964 case MKTAG('i', 'd', 'x', '1'):
965 if (avi_read_idx1(s, size) < 0)
966 goto skip;
967 else
968 goto the_end;
969 break;
970 default:
971 skip:
972 size += (size & 1);
973 url_fskip(pb, size);
974 break;
975 }
976 }
977 the_end:
978 url_fseek(pb, pos, SEEK_SET);
979 return 0;
980 }
981
982 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
983 {
984 AVIContext *avi = s->priv_data;
985 AVStream *st;
986 int i, index;
987 int64_t pos;
988
989 if (!avi->index_loaded) {
990 /* we only load the index on demand */
991 avi_load_index(s);
992 avi->index_loaded = 1;
993 }
994 assert(stream_index>= 0);
995
996 st = s->streams[stream_index];
997 index= av_index_search_timestamp(st, timestamp, flags);
998 if(index<0)
999 return -1;
1000
1001 /* find the position */
1002 pos = st->index_entries[index].pos;
1003 timestamp = st->index_entries[index].timestamp;
1004
1005 // av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1006
1007 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
1008 /* One and only one real stream for DV in AVI, and it has video */
1009 /* offsets. Calling with other stream indexes should have failed */
1010 /* the av_index_search_timestamp call above. */
1011 assert(stream_index == 0);
1012
1013 /* Feed the DV video stream version of the timestamp to the */
1014 /* DV demux so it can synthesize correct timestamps. */
1015 dv_offset_reset(avi->dv_demux, timestamp);
1016
1017 url_fseek(s->pb, pos, SEEK_SET);
1018 avi->stream_index= -1;
1019 return 0;
1020 }
1021
1022 for(i = 0; i < s->nb_streams; i++) {
1023 AVStream *st2 = s->streams[i];
1024 AVIStream *ast2 = st2->priv_data;
1025
1026 ast2->packet_size=
1027 ast2->remaining= 0;
1028
1029 if (st2->nb_index_entries <= 0)
1030 continue;
1031
1032 // assert(st2->codec->block_align);
1033 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1034 index = av_index_search_timestamp(
1035 st2,
1036 av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
1037 flags | AVSEEK_FLAG_BACKWARD);
1038 if(index<0)
1039 index=0;
1040
1041 if(!avi->non_interleaved){
1042 while(index>0 && st2->index_entries[index].pos > pos)
1043 index--;
1044 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1045 index++;
1046 }
1047
1048 // av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1049 /* extract the current frame number */
1050 ast2->frame_offset = st2->index_entries[index].timestamp;
1051 if(ast2->sample_size)
1052 ast2->frame_offset *=ast2->sample_size;
1053 }
1054
1055 /* do the seek */
1056 url_fseek(s->pb, pos, SEEK_SET);
1057 avi->stream_index= -1;
1058 return 0;
1059 }
1060
1061 static int avi_read_close(AVFormatContext *s)
1062 {
1063 int i;
1064 AVIContext *avi = s->priv_data;
1065
1066 for(i=0;i<s->nb_streams;i++) {
1067 AVStream *st = s->streams[i];
1068 av_free(st->codec->palctrl);
1069 }
1070
1071 if (avi->dv_demux)
1072 av_free(avi->dv_demux);
1073
1074 return 0;
1075 }
1076
1077 static int avi_probe(AVProbeData *p)
1078 {
1079 int i;
1080
1081 /* check file header */
1082 for(i=0; avi_headers[i][0]; i++)
1083 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1084 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1085 return AVPROBE_SCORE_MAX;
1086
1087 return 0;
1088 }
1089
1090 AVInputFormat avi_demuxer = {
1091 "avi",
1092 NULL_IF_CONFIG_SMALL("AVI format"),
1093 sizeof(AVIContext),
1094 avi_probe,
1095 avi_read_header,
1096 avi_read_packet,
1097 avi_read_close,
1098 avi_read_seek,
1099 };