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