3526700ba79521556acea9dd0dd6e6e1aee3e1fa
[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 #include "libavutil/intreadwrite.h"
23 #include "libavutil/bswap.h"
24 #include "avformat.h"
25 #include "avi.h"
26 #include "dv.h"
27 #include "riff.h"
28
29 #undef NDEBUG
30 #include <assert.h>
31
32 //#define DEBUG
33 //#define DEBUG_SEEK
34
35 typedef struct AVIStream {
36 int64_t frame_offset; /* current frame (video) or byte (audio) counter
37 (used to compute the pts) */
38 int remaining;
39 int packet_size;
40
41 int scale;
42 int rate;
43 int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
44
45 int64_t cum_len; /* temporary storage (used during seek) */
46
47 int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
48 int prefix_count;
49 uint32_t pal[256];
50 int has_pal;
51 } AVIStream;
52
53 typedef struct {
54 int64_t riff_end;
55 int64_t movi_end;
56 int64_t fsize;
57 int64_t movi_list;
58 int64_t last_pkt_pos;
59 int index_loaded;
60 int is_odml;
61 int non_interleaved;
62 int stream_index;
63 DVDemuxContext* dv_demux;
64 } AVIContext;
65
66 static const char avi_headers[][8] = {
67 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
68 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
69 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
70 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
71 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
72 { 0 }
73 };
74
75 static int avi_load_index(AVFormatContext *s);
76 static int guess_ni_flag(AVFormatContext *s);
77
78 #ifdef DEBUG
79 static void print_tag(const char *str, unsigned int tag, int size)
80 {
81 printf("%s: tag=%c%c%c%c size=0x%x\n",
82 str, tag & 0xff,
83 (tag >> 8) & 0xff,
84 (tag >> 16) & 0xff,
85 (tag >> 24) & 0xff,
86 size);
87 }
88 #endif
89
90 static int get_riff(AVFormatContext *s, ByteIOContext *pb)
91 {
92 AVIContext *avi = s->priv_data;
93 char header[8];
94 int i;
95
96 /* check RIFF header */
97 get_buffer(pb, header, 4);
98 avi->riff_end = get_le32(pb); /* RIFF chunk size */
99 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
100 get_buffer(pb, header+4, 4);
101
102 for(i=0; avi_headers[i][0]; i++)
103 if(!memcmp(header, avi_headers[i], 8))
104 break;
105 if(!avi_headers[i][0])
106 return -1;
107
108 if(header[7] == 0x19)
109 av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
110
111 return 0;
112 }
113
114 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
115 AVIContext *avi = s->priv_data;
116 ByteIOContext *pb = s->pb;
117 int longs_pre_entry= get_le16(pb);
118 int index_sub_type = get_byte(pb);
119 int index_type = get_byte(pb);
120 int entries_in_use = get_le32(pb);
121 int chunk_id = get_le32(pb);
122 int64_t base = get_le64(pb);
123 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
124 AVStream *st;
125 AVIStream *ast;
126 int i;
127 int64_t last_pos= -1;
128 int64_t filesize= url_fsize(s->pb);
129
130 #ifdef DEBUG_SEEK
131 av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
132 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
133 #endif
134
135 if(stream_id > s->nb_streams || stream_id < 0)
136 return -1;
137 st= s->streams[stream_id];
138 ast = st->priv_data;
139
140 if(index_sub_type)
141 return -1;
142
143 get_le32(pb);
144
145 if(index_type && longs_pre_entry != 2)
146 return -1;
147 if(index_type>1)
148 return -1;
149
150 if(filesize > 0 && base >= filesize){
151 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
152 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
153 base &= 0xFFFFFFFF;
154 else
155 return -1;
156 }
157
158 for(i=0; i<entries_in_use; i++){
159 if(index_type){
160 int64_t pos= get_le32(pb) + base - 8;
161 int len = get_le32(pb);
162 int key= len >= 0;
163 len &= 0x7FFFFFFF;
164
165 #ifdef DEBUG_SEEK
166 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
167 #endif
168 if(last_pos == pos || pos == base - 8)
169 avi->non_interleaved= 1;
170 if(last_pos != pos)
171 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
172
173 if(ast->sample_size)
174 ast->cum_len += len;
175 else
176 ast->cum_len ++;
177 last_pos= pos;
178 }else{
179 int64_t offset, pos;
180 int duration;
181 offset = get_le64(pb);
182 get_le32(pb); /* size */
183 duration = get_le32(pb);
184 pos = url_ftell(pb);
185
186 url_fseek(pb, offset+8, SEEK_SET);
187 read_braindead_odml_indx(s, frame_num);
188 frame_num += duration;
189
190 url_fseek(pb, pos, SEEK_SET);
191 }
192 }
193 avi->index_loaded=1;
194 return 0;
195 }
196
197 static void clean_index(AVFormatContext *s){
198 int i;
199 int64_t j;
200
201 for(i=0; i<s->nb_streams; i++){
202 AVStream *st = s->streams[i];
203 AVIStream *ast = st->priv_data;
204 int n= st->nb_index_entries;
205 int max= ast->sample_size;
206 int64_t pos, size, ts;
207
208 if(n != 1 || ast->sample_size==0)
209 continue;
210
211 while(max < 1024) max+=max;
212
213 pos= st->index_entries[0].pos;
214 size= st->index_entries[0].size;
215 ts= st->index_entries[0].timestamp;
216
217 for(j=0; j<size; j+=max){
218 av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
219 }
220 }
221 }
222
223 static int avi_read_tag(AVFormatContext *s, const char *key, unsigned int size)
224 {
225 ByteIOContext *pb = s->pb;
226 uint8_t value[1024];
227
228 int64_t i = url_ftell(pb);
229 size += (size & 1);
230 get_strz(pb, value, sizeof(value));
231 url_fseek(pb, i+size, SEEK_SET);
232
233 return av_metadata_set(&s->metadata, key, value);
234 }
235
236 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
237 {
238 AVIContext *avi = s->priv_data;
239 ByteIOContext *pb = s->pb;
240 unsigned int tag, tag1, handler;
241 int codec_type, stream_index, frame_period, bit_rate;
242 unsigned int size, nb_frames;
243 int i;
244 AVStream *st;
245 AVIStream *ast = NULL;
246 int avih_width=0, avih_height=0;
247 int amv_file_format=0;
248
249 avi->stream_index= -1;
250
251 if (get_riff(s, pb) < 0)
252 return -1;
253
254 avi->fsize = url_fsize(pb);
255 if(avi->fsize<=0)
256 avi->fsize= avi->riff_end;
257
258 /* first list tag */
259 stream_index = -1;
260 codec_type = -1;
261 frame_period = 0;
262 for(;;) {
263 if (url_feof(pb))
264 goto fail;
265 tag = get_le32(pb);
266 size = get_le32(pb);
267 #ifdef DEBUG
268 print_tag("tag", tag, size);
269 #endif
270
271 switch(tag) {
272 case MKTAG('L', 'I', 'S', 'T'):
273 /* Ignored, except at start of video packets. */
274 tag1 = get_le32(pb);
275 #ifdef DEBUG
276 print_tag("list", tag1, 0);
277 #endif
278 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
279 avi->movi_list = url_ftell(pb) - 4;
280 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
281 else avi->movi_end = url_fsize(pb);
282 #ifdef DEBUG
283 printf("movi end=%"PRIx64"\n", avi->movi_end);
284 #endif
285 goto end_of_header;
286 }
287 break;
288 case MKTAG('d', 'm', 'l', 'h'):
289 avi->is_odml = 1;
290 url_fskip(pb, size + (size & 1));
291 break;
292 case MKTAG('a', 'm', 'v', 'h'):
293 amv_file_format=1;
294 case MKTAG('a', 'v', 'i', 'h'):
295 /* AVI header */
296 /* using frame_period is bad idea */
297 frame_period = get_le32(pb);
298 bit_rate = get_le32(pb) * 8;
299 get_le32(pb);
300 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
301
302 url_fskip(pb, 2 * 4);
303 get_le32(pb);
304 get_le32(pb);
305 avih_width=get_le32(pb);
306 avih_height=get_le32(pb);
307
308 url_fskip(pb, size - 10 * 4);
309 break;
310 case MKTAG('s', 't', 'r', 'h'):
311 /* stream header */
312
313 tag1 = get_le32(pb);
314 handler = get_le32(pb); /* codec tag */
315
316 if(tag1 == MKTAG('p', 'a', 'd', 's')){
317 url_fskip(pb, size - 8);
318 break;
319 }else{
320 stream_index++;
321 st = av_new_stream(s, stream_index);
322 if (!st)
323 goto fail;
324
325 ast = av_mallocz(sizeof(AVIStream));
326 if (!ast)
327 goto fail;
328 st->priv_data = ast;
329 }
330 if(amv_file_format)
331 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
332
333 #ifdef DEBUG
334 print_tag("strh", tag1, -1);
335 #endif
336 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
337 int64_t dv_dur;
338
339 /*
340 * After some consideration -- I don't think we
341 * have to support anything but DV in type1 AVIs.
342 */
343 if (s->nb_streams != 1)
344 goto fail;
345
346 if (handler != MKTAG('d', 'v', 's', 'd') &&
347 handler != MKTAG('d', 'v', 'h', 'd') &&
348 handler != MKTAG('d', 'v', 's', 'l'))
349 goto fail;
350
351 ast = s->streams[0]->priv_data;
352 av_freep(&s->streams[0]->codec->extradata);
353 av_freep(&s->streams[0]);
354 s->nb_streams = 0;
355 if (CONFIG_DV_DEMUXER) {
356 avi->dv_demux = dv_init_demux(s);
357 if (!avi->dv_demux)
358 goto fail;
359 }
360 s->streams[0]->priv_data = ast;
361 url_fskip(pb, 3 * 4);
362 ast->scale = get_le32(pb);
363 ast->rate = get_le32(pb);
364 url_fskip(pb, 4); /* start time */
365
366 dv_dur = get_le32(pb);
367 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
368 dv_dur *= AV_TIME_BASE;
369 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
370 }
371 /*
372 * else, leave duration alone; timing estimation in utils.c
373 * will make a guess based on bitrate.
374 */
375
376 stream_index = s->nb_streams - 1;
377 url_fskip(pb, size - 9*4);
378 break;
379 }
380
381 assert(stream_index < s->nb_streams);
382 st->codec->stream_codec_tag= handler;
383
384 get_le32(pb); /* flags */
385 get_le16(pb); /* priority */
386 get_le16(pb); /* language */
387 get_le32(pb); /* initial frame */
388 ast->scale = get_le32(pb);
389 ast->rate = get_le32(pb);
390 if(!(ast->scale && ast->rate)){
391 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);
392 if(frame_period){
393 ast->rate = 1000000;
394 ast->scale = frame_period;
395 }else{
396 ast->rate = 25;
397 ast->scale = 1;
398 }
399 }
400 av_set_pts_info(st, 64, ast->scale, ast->rate);
401
402 ast->cum_len=get_le32(pb); /* start */
403 nb_frames = get_le32(pb);
404
405 st->start_time = 0;
406 st->duration = nb_frames;
407 get_le32(pb); /* buffer size */
408 get_le32(pb); /* quality */
409 ast->sample_size = get_le32(pb); /* sample ssize */
410 ast->cum_len *= FFMAX(1, ast->sample_size);
411 // av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
412
413 switch(tag1) {
414 case MKTAG('v', 'i', 'd', 's'):
415 codec_type = CODEC_TYPE_VIDEO;
416
417 ast->sample_size = 0;
418 break;
419 case MKTAG('a', 'u', 'd', 's'):
420 codec_type = CODEC_TYPE_AUDIO;
421 break;
422 case MKTAG('t', 'x', 't', 's'):
423 //FIXME
424 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
425 break;
426 case MKTAG('d', 'a', 't', 's'):
427 codec_type = CODEC_TYPE_DATA;
428 break;
429 default:
430 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
431 goto fail;
432 }
433 ast->frame_offset= ast->cum_len;
434 url_fskip(pb, size - 12 * 4);
435 break;
436 case MKTAG('s', 't', 'r', 'f'):
437 /* stream header */
438 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
439 url_fskip(pb, size);
440 } else {
441 st = s->streams[stream_index];
442 switch(codec_type) {
443 case CODEC_TYPE_VIDEO:
444 if(amv_file_format){
445 st->codec->width=avih_width;
446 st->codec->height=avih_height;
447 st->codec->codec_type = CODEC_TYPE_VIDEO;
448 st->codec->codec_id = CODEC_ID_AMV;
449 url_fskip(pb, size);
450 break;
451 }
452 get_le32(pb); /* size */
453 st->codec->width = get_le32(pb);
454 st->codec->height = (int32_t)get_le32(pb);
455 get_le16(pb); /* panes */
456 st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
457 tag1 = get_le32(pb);
458 get_le32(pb); /* ImageSize */
459 get_le32(pb); /* XPelsPerMeter */
460 get_le32(pb); /* YPelsPerMeter */
461 get_le32(pb); /* ClrUsed */
462 get_le32(pb); /* ClrImportant */
463
464 if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
465 st->codec->codec_type = CODEC_TYPE_SUBTITLE;
466 st->codec->codec_tag = tag1;
467 st->codec->codec_id = CODEC_ID_XSUB;
468 break;
469 }
470
471 if(size > 10*4 && size<(1<<30)){
472 st->codec->extradata_size= size - 10*4;
473 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
474 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
475 }
476
477 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
478 get_byte(pb);
479
480 /* Extract palette from extradata if bpp <= 8. */
481 /* This code assumes that extradata contains only palette. */
482 /* This is true for all paletted codecs implemented in FFmpeg. */
483 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
484 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
485 #ifdef WORDS_BIGENDIAN
486 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
487 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
488 #else
489 memcpy(st->codec->palctrl->palette, st->codec->extradata,
490 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
491 #endif
492 st->codec->palctrl->palette_changed = 1;
493 }
494
495 #ifdef DEBUG
496 print_tag("video", tag1, 0);
497 #endif
498 st->codec->codec_type = CODEC_TYPE_VIDEO;
499 st->codec->codec_tag = tag1;
500 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
501 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
502
503 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
504 st->codec->extradata_size+= 9;
505 st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
506 if(st->codec->extradata)
507 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
508 }
509 st->codec->height= FFABS(st->codec->height);
510
511 // url_fskip(pb, size - 5 * 4);
512 break;
513 case CODEC_TYPE_AUDIO:
514 get_wav_header(pb, st->codec, size);
515 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
516 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
517 ast->sample_size= st->codec->block_align;
518 }
519 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
520 url_fskip(pb, 1);
521 /* Force parsing as several audio frames can be in
522 * one packet and timestamps refer to packet start. */
523 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
524 /* ADTS header is in extradata, AAC without header must be
525 * stored as exact frames. Parser not needed and it will
526 * fail. */
527 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
528 st->need_parsing = AVSTREAM_PARSE_NONE;
529 /* AVI files with Xan DPCM audio (wrongly) declare PCM
530 * audio in the header but have Axan as stream_code_tag. */
531 if (st->codec->stream_codec_tag == AV_RL32("Axan")){
532 st->codec->codec_id = CODEC_ID_XAN_DPCM;
533 st->codec->codec_tag = 0;
534 }
535 if (amv_file_format)
536 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
537 break;
538 default:
539 st->codec->codec_type = CODEC_TYPE_DATA;
540 st->codec->codec_id= CODEC_ID_NONE;
541 st->codec->codec_tag= 0;
542 url_fskip(pb, size);
543 break;
544 }
545 }
546 break;
547 case MKTAG('i', 'n', 'd', 'x'):
548 i= url_ftell(pb);
549 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
550 read_braindead_odml_indx(s, 0);
551 }
552 url_fseek(pb, i+size, SEEK_SET);
553 break;
554 case MKTAG('v', 'p', 'r', 'p'):
555 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
556 AVRational active, active_aspect;
557
558 st = s->streams[stream_index];
559 get_le32(pb);
560 get_le32(pb);
561 get_le32(pb);
562 get_le32(pb);
563 get_le32(pb);
564
565 active_aspect.den= get_le16(pb);
566 active_aspect.num= get_le16(pb);
567 active.num = get_le32(pb);
568 active.den = get_le32(pb);
569 get_le32(pb); //nbFieldsPerFrame
570
571 if(active_aspect.num && active_aspect.den && active.num && active.den){
572 st->sample_aspect_ratio= av_div_q(active_aspect, active);
573 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
574 }
575 size -= 9*4;
576 }
577 url_fseek(pb, size, SEEK_CUR);
578 break;
579 case MKTAG('I', 'N', 'A', 'M'):
580 avi_read_tag(s, "Title", size);
581 break;
582 case MKTAG('I', 'A', 'R', 'T'):
583 avi_read_tag(s, "Artist", size);
584 break;
585 case MKTAG('I', 'C', 'O', 'P'):
586 avi_read_tag(s, "Copyright", size);
587 break;
588 case MKTAG('I', 'C', 'M', 'T'):
589 avi_read_tag(s, "Comment", size);
590 break;
591 case MKTAG('I', 'G', 'N', 'R'):
592 avi_read_tag(s, "Genre", size);
593 break;
594 case MKTAG('I', 'P', 'R', 'D'):
595 avi_read_tag(s, "Album", size);
596 break;
597 case MKTAG('I', 'P', 'R', 'T'):
598 avi_read_tag(s, "Track", size);
599 break;
600 default:
601 if(size > 1000000){
602 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
603 "I will ignore it and try to continue anyway.\n");
604 avi->movi_list = url_ftell(pb) - 4;
605 avi->movi_end = url_fsize(pb);
606 goto end_of_header;
607 }
608 /* skip tag */
609 size += (size & 1);
610 url_fskip(pb, size);
611 break;
612 }
613 }
614 end_of_header:
615 /* check stream number */
616 if (stream_index != s->nb_streams - 1) {
617 fail:
618 return -1;
619 }
620
621 if(!avi->index_loaded && !url_is_streamed(pb))
622 avi_load_index(s);
623 avi->index_loaded = 1;
624 avi->non_interleaved |= guess_ni_flag(s);
625 if(avi->non_interleaved) {
626 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
627 clean_index(s);
628 }
629
630 return 0;
631 }
632
633 static int get_stream_idx(int *d){
634 if( d[0] >= '0' && d[0] <= '9'
635 && d[1] >= '0' && d[1] <= '9'){
636 return (d[0] - '0') * 10 + (d[1] - '0');
637 }else{
638 return 100; //invalid stream ID
639 }
640 }
641
642 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
643 {
644 AVIContext *avi = s->priv_data;
645 ByteIOContext *pb = s->pb;
646 int n, d[8];
647 unsigned int size;
648 int64_t i, sync;
649 void* dstr;
650
651 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
652 int size = dv_get_packet(avi->dv_demux, pkt);
653 if (size >= 0)
654 return size;
655 }
656
657 if(avi->non_interleaved){
658 int best_stream_index = 0;
659 AVStream *best_st= NULL;
660 AVIStream *best_ast;
661 int64_t best_ts= INT64_MAX;
662 int i;
663
664 for(i=0; i<s->nb_streams; i++){
665 AVStream *st = s->streams[i];
666 AVIStream *ast = st->priv_data;
667 int64_t ts= ast->frame_offset;
668
669 if(ast->sample_size)
670 ts /= ast->sample_size;
671 ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
672
673 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
674 if(ts < best_ts && st->nb_index_entries){
675 best_ts= ts;
676 best_st= st;
677 best_stream_index= i;
678 }
679 }
680 if(!best_st)
681 return -1;
682
683 best_ast = best_st->priv_data;
684 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
685 if(best_ast->remaining)
686 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
687 else{
688 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
689 if(i>=0)
690 best_ast->frame_offset= best_st->index_entries[i].timestamp
691 * FFMAX(1, best_ast->sample_size);
692 }
693
694 // av_log(s, AV_LOG_DEBUG, "%d\n", i);
695 if(i>=0){
696 int64_t pos= best_st->index_entries[i].pos;
697 pos += best_ast->packet_size - best_ast->remaining;
698 url_fseek(s->pb, pos + 8, SEEK_SET);
699 // av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
700
701 assert(best_ast->remaining <= best_ast->packet_size);
702
703 avi->stream_index= best_stream_index;
704 if(!best_ast->remaining)
705 best_ast->packet_size=
706 best_ast->remaining= best_st->index_entries[i].size;
707 }
708 }
709
710 resync:
711 if(avi->stream_index >= 0){
712 AVStream *st= s->streams[ avi->stream_index ];
713 AVIStream *ast= st->priv_data;
714 int size;
715
716 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
717 size= INT_MAX;
718 else if(ast->sample_size < 32)
719 size= 64*ast->sample_size;
720 else
721 size= ast->sample_size;
722
723 if(size > ast->remaining)
724 size= ast->remaining;
725 avi->last_pkt_pos= url_ftell(pb);
726 av_get_packet(pb, pkt, size);
727
728 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
729 ast->has_pal=0;
730 pkt->size += 4*256;
731 pkt->data = av_realloc(pkt->data, pkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
732 if(pkt->data)
733 memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
734 }
735
736 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
737 dstr = pkt->destruct;
738 size = dv_produce_packet(avi->dv_demux, pkt,
739 pkt->data, pkt->size);
740 pkt->destruct = dstr;
741 pkt->flags |= PKT_FLAG_KEY;
742 } else {
743 /* XXX: How to handle B-frames in AVI? */
744 pkt->dts = ast->frame_offset;
745 // pkt->dts += ast->start;
746 if(ast->sample_size)
747 pkt->dts /= ast->sample_size;
748 //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);
749 pkt->stream_index = avi->stream_index;
750
751 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
752 AVIndexEntry *e;
753 int index;
754 assert(st->index_entries);
755
756 index= av_index_search_timestamp(st, pkt->dts, 0);
757 e= &st->index_entries[index];
758
759 if(index >= 0 && e->timestamp == ast->frame_offset){
760 if (e->flags & AVINDEX_KEYFRAME)
761 pkt->flags |= PKT_FLAG_KEY;
762 }
763 } else {
764 pkt->flags |= PKT_FLAG_KEY;
765 }
766 if(ast->sample_size)
767 ast->frame_offset += pkt->size;
768 else
769 ast->frame_offset++;
770 }
771 ast->remaining -= size;
772 if(!ast->remaining){
773 avi->stream_index= -1;
774 ast->packet_size= 0;
775 }
776
777 return size;
778 }
779
780 memset(d, -1, sizeof(int)*8);
781 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
782 int j;
783
784 for(j=0; j<7; j++)
785 d[j]= d[j+1];
786 d[7]= get_byte(pb);
787
788 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
789
790 n= get_stream_idx(d+2);
791 //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);
792 if(i + (uint64_t)size > avi->fsize || d[0]<0)
793 continue;
794
795 //parse ix##
796 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
797 //parse JUNK
798 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
799 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
800 url_fskip(pb, size);
801 //av_log(s, AV_LOG_DEBUG, "SKIP\n");
802 goto resync;
803 }
804
805 n= get_stream_idx(d);
806
807 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
808 continue;
809
810 //parse ##dc/##wb
811 if(n < s->nb_streams){
812 AVStream *st;
813 AVIStream *ast;
814 st = s->streams[n];
815 ast = st->priv_data;
816
817 if(s->nb_streams>=2){
818 AVStream *st1 = s->streams[1];
819 AVIStream *ast1= st1->priv_data;
820 //workaround for broken small-file-bug402.avi
821 if( d[2] == 'w' && d[3] == 'b'
822 && n==0
823 && st ->codec->codec_type == CODEC_TYPE_VIDEO
824 && st1->codec->codec_type == CODEC_TYPE_AUDIO
825 && ast->prefix == 'd'*256+'c'
826 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
827 ){
828 n=1;
829 st = st1;
830 ast = ast1;
831 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
832 }
833 }
834
835
836 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
837 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
838 || st->discard >= AVDISCARD_ALL){
839 if(ast->sample_size) ast->frame_offset += pkt->size;
840 else ast->frame_offset++;
841 url_fskip(pb, size);
842 goto resync;
843 }
844
845 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
846 int k = get_byte(pb);
847 int last = (k + get_byte(pb) - 1) & 0xFF;
848
849 get_le16(pb); //flags
850
851 for (; k <= last; k++)
852 ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
853 ast->has_pal= 1;
854 goto resync;
855 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
856 d[2]*256+d[3] == ast->prefix /*||
857 (d[2] == 'd' && d[3] == 'c') ||
858 (d[2] == 'w' && d[3] == 'b')*/) {
859
860 //av_log(s, AV_LOG_DEBUG, "OK\n");
861 if(d[2]*256+d[3] == ast->prefix)
862 ast->prefix_count++;
863 else{
864 ast->prefix= d[2]*256+d[3];
865 ast->prefix_count= 0;
866 }
867
868 avi->stream_index= n;
869 ast->packet_size= size + 8;
870 ast->remaining= size;
871
872 {
873 uint64_t pos= url_ftell(pb) - 8;
874 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
875 av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
876 }
877 }
878 goto resync;
879 }
880 }
881 }
882
883 return AVERROR_EOF;
884 }
885
886 /* XXX: We make the implicit supposition that the positions are sorted
887 for each stream. */
888 static int avi_read_idx1(AVFormatContext *s, int size)
889 {
890 AVIContext *avi = s->priv_data;
891 ByteIOContext *pb = s->pb;
892 int nb_index_entries, i;
893 AVStream *st;
894 AVIStream *ast;
895 unsigned int index, tag, flags, pos, len;
896 unsigned last_pos= -1;
897
898 nb_index_entries = size / 16;
899 if (nb_index_entries <= 0)
900 return -1;
901
902 /* Read the entries and sort them in each stream component. */
903 for(i = 0; i < nb_index_entries; i++) {
904 tag = get_le32(pb);
905 flags = get_le32(pb);
906 pos = get_le32(pb);
907 len = get_le32(pb);
908 #if defined(DEBUG_SEEK)
909 av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
910 i, tag, flags, pos, len);
911 #endif
912 if(i==0 && pos > avi->movi_list)
913 avi->movi_list= 0; //FIXME better check
914 pos += avi->movi_list;
915
916 index = ((tag & 0xff) - '0') * 10;
917 index += ((tag >> 8) & 0xff) - '0';
918 if (index >= s->nb_streams)
919 continue;
920 st = s->streams[index];
921 ast = st->priv_data;
922
923 #if defined(DEBUG_SEEK)
924 av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
925 #endif
926 if(last_pos == pos)
927 avi->non_interleaved= 1;
928 else
929 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
930 if(ast->sample_size)
931 ast->cum_len += len;
932 else
933 ast->cum_len ++;
934 last_pos= pos;
935 }
936 return 0;
937 }
938
939 static int guess_ni_flag(AVFormatContext *s){
940 int i;
941 int64_t last_start=0;
942 int64_t first_end= INT64_MAX;
943
944 for(i=0; i<s->nb_streams; i++){
945 AVStream *st = s->streams[i];
946 int n= st->nb_index_entries;
947
948 if(n <= 0)
949 continue;
950
951 if(st->index_entries[0].pos > last_start)
952 last_start= st->index_entries[0].pos;
953 if(st->index_entries[n-1].pos < first_end)
954 first_end= st->index_entries[n-1].pos;
955 }
956 return last_start > first_end;
957 }
958
959 static int avi_load_index(AVFormatContext *s)
960 {
961 AVIContext *avi = s->priv_data;
962 ByteIOContext *pb = s->pb;
963 uint32_t tag, size;
964 int64_t pos= url_ftell(pb);
965
966 url_fseek(pb, avi->movi_end, SEEK_SET);
967 #ifdef DEBUG_SEEK
968 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
969 #endif
970 for(;;) {
971 if (url_feof(pb))
972 break;
973 tag = get_le32(pb);
974 size = get_le32(pb);
975 #ifdef DEBUG_SEEK
976 printf("tag=%c%c%c%c size=0x%x\n",
977 tag & 0xff,
978 (tag >> 8) & 0xff,
979 (tag >> 16) & 0xff,
980 (tag >> 24) & 0xff,
981 size);
982 #endif
983 switch(tag) {
984 case MKTAG('i', 'd', 'x', '1'):
985 if (avi_read_idx1(s, size) < 0)
986 goto skip;
987 else
988 goto the_end;
989 break;
990 default:
991 skip:
992 size += (size & 1);
993 url_fskip(pb, size);
994 break;
995 }
996 }
997 the_end:
998 url_fseek(pb, pos, SEEK_SET);
999 return 0;
1000 }
1001
1002 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1003 {
1004 AVIContext *avi = s->priv_data;
1005 AVStream *st;
1006 int i, index;
1007 int64_t pos;
1008
1009 if (!avi->index_loaded) {
1010 /* we only load the index on demand */
1011 avi_load_index(s);
1012 avi->index_loaded = 1;
1013 }
1014 assert(stream_index>= 0);
1015
1016 st = s->streams[stream_index];
1017 index= av_index_search_timestamp(st, timestamp, flags);
1018 if(index<0)
1019 return -1;
1020
1021 /* find the position */
1022 pos = st->index_entries[index].pos;
1023 timestamp = st->index_entries[index].timestamp;
1024
1025 // av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1026
1027 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1028 /* One and only one real stream for DV in AVI, and it has video */
1029 /* offsets. Calling with other stream indexes should have failed */
1030 /* the av_index_search_timestamp call above. */
1031 assert(stream_index == 0);
1032
1033 /* Feed the DV video stream version of the timestamp to the */
1034 /* DV demux so it can synthesize correct timestamps. */
1035 dv_offset_reset(avi->dv_demux, timestamp);
1036
1037 url_fseek(s->pb, pos, SEEK_SET);
1038 avi->stream_index= -1;
1039 return 0;
1040 }
1041
1042 for(i = 0; i < s->nb_streams; i++) {
1043 AVStream *st2 = s->streams[i];
1044 AVIStream *ast2 = st2->priv_data;
1045
1046 ast2->packet_size=
1047 ast2->remaining= 0;
1048
1049 if (st2->nb_index_entries <= 0)
1050 continue;
1051
1052 // assert(st2->codec->block_align);
1053 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1054 index = av_index_search_timestamp(
1055 st2,
1056 av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
1057 flags | AVSEEK_FLAG_BACKWARD);
1058 if(index<0)
1059 index=0;
1060
1061 if(!avi->non_interleaved){
1062 while(index>0 && st2->index_entries[index].pos > pos)
1063 index--;
1064 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1065 index++;
1066 }
1067
1068 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1069 /* extract the current frame number */
1070 ast2->frame_offset = st2->index_entries[index].timestamp;
1071 if(ast2->sample_size)
1072 ast2->frame_offset *=ast2->sample_size;
1073 }
1074
1075 /* do the seek */
1076 url_fseek(s->pb, pos, SEEK_SET);
1077 avi->stream_index= -1;
1078 return 0;
1079 }
1080
1081 static int avi_read_close(AVFormatContext *s)
1082 {
1083 int i;
1084 AVIContext *avi = s->priv_data;
1085
1086 for(i=0;i<s->nb_streams;i++) {
1087 AVStream *st = s->streams[i];
1088 av_free(st->codec->palctrl);
1089 }
1090
1091 if (avi->dv_demux)
1092 av_free(avi->dv_demux);
1093
1094 return 0;
1095 }
1096
1097 static int avi_probe(AVProbeData *p)
1098 {
1099 int i;
1100
1101 /* check file header */
1102 for(i=0; avi_headers[i][0]; i++)
1103 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1104 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1105 return AVPROBE_SCORE_MAX;
1106
1107 return 0;
1108 }
1109
1110 AVInputFormat avi_demuxer = {
1111 "avi",
1112 NULL_IF_CONFIG_SMALL("AVI format"),
1113 sizeof(AVIContext),
1114 avi_probe,
1115 avi_read_header,
1116 avi_read_packet,
1117 avi_read_close,
1118 avi_read_seek,
1119 };