cd8c613ed07f8829820cb522a8e2e4ad26f869c3
[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 //#define DEBUG
23 //#define DEBUG_SEEK
24
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/bswap.h"
27 #include "avformat.h"
28 #include "avi.h"
29 #include "dv.h"
30 #include "riff.h"
31
32 #undef NDEBUG
33 #include <assert.h>
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 dprintf(NULL, "%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(url_feof(pb))
169 return -1;
170
171 if(last_pos == pos || pos == base - 8)
172 avi->non_interleaved= 1;
173 if(last_pos != pos)
174 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
175
176 if(ast->sample_size)
177 ast->cum_len += len;
178 else
179 ast->cum_len ++;
180 last_pos= pos;
181 }else{
182 int64_t offset, pos;
183 int duration;
184 offset = get_le64(pb);
185 get_le32(pb); /* size */
186 duration = get_le32(pb);
187
188 if(url_feof(pb))
189 return -1;
190
191 pos = url_ftell(pb);
192
193 url_fseek(pb, offset+8, SEEK_SET);
194 read_braindead_odml_indx(s, frame_num);
195 frame_num += duration;
196
197 url_fseek(pb, pos, SEEK_SET);
198 }
199 }
200 avi->index_loaded=1;
201 return 0;
202 }
203
204 static void clean_index(AVFormatContext *s){
205 int i;
206 int64_t j;
207
208 for(i=0; i<s->nb_streams; i++){
209 AVStream *st = s->streams[i];
210 AVIStream *ast = st->priv_data;
211 int n= st->nb_index_entries;
212 int max= ast->sample_size;
213 int64_t pos, size, ts;
214
215 if(n != 1 || ast->sample_size==0)
216 continue;
217
218 while(max < 1024) max+=max;
219
220 pos= st->index_entries[0].pos;
221 size= st->index_entries[0].size;
222 ts= st->index_entries[0].timestamp;
223
224 for(j=0; j<size; j+=max){
225 av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
226 }
227 }
228 }
229
230 static int avi_read_tag(AVFormatContext *s, const char *key, unsigned int size)
231 {
232 ByteIOContext *pb = s->pb;
233 uint8_t value[1024];
234
235 int64_t i = url_ftell(pb);
236 size += (size & 1);
237 get_strz(pb, value, sizeof(value));
238 url_fseek(pb, i+size, SEEK_SET);
239
240 return av_metadata_set(&s->metadata, key, value);
241 }
242
243 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
244 {
245 AVIContext *avi = s->priv_data;
246 ByteIOContext *pb = s->pb;
247 unsigned int tag, tag1, handler;
248 int codec_type, stream_index, frame_period, bit_rate;
249 unsigned int size, nb_frames;
250 int i;
251 AVStream *st;
252 AVIStream *ast = NULL;
253 int avih_width=0, avih_height=0;
254 int amv_file_format=0;
255 uint64_t list_end = 0;
256
257 avi->stream_index= -1;
258
259 if (get_riff(s, pb) < 0)
260 return -1;
261
262 avi->fsize = url_fsize(pb);
263 if(avi->fsize<=0)
264 avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
265
266 /* first list tag */
267 stream_index = -1;
268 codec_type = -1;
269 frame_period = 0;
270 for(;;) {
271 if (url_feof(pb))
272 goto fail;
273 tag = get_le32(pb);
274 size = get_le32(pb);
275 #ifdef DEBUG
276 print_tag("tag", tag, size);
277 #endif
278
279 switch(tag) {
280 case MKTAG('L', 'I', 'S', 'T'):
281 list_end = url_ftell(pb) + size;
282 /* Ignored, except at start of video packets. */
283 tag1 = get_le32(pb);
284 #ifdef DEBUG
285 print_tag("list", tag1, 0);
286 #endif
287 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
288 avi->movi_list = url_ftell(pb) - 4;
289 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
290 else avi->movi_end = url_fsize(pb);
291 #ifdef DEBUG
292 dprintf(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
293 #endif
294 goto end_of_header;
295 }
296 break;
297 case MKTAG('d', 'm', 'l', 'h'):
298 avi->is_odml = 1;
299 url_fskip(pb, size + (size & 1));
300 break;
301 case MKTAG('a', 'm', 'v', 'h'):
302 amv_file_format=1;
303 case MKTAG('a', 'v', 'i', 'h'):
304 /* AVI header */
305 /* using frame_period is bad idea */
306 frame_period = get_le32(pb);
307 bit_rate = get_le32(pb) * 8;
308 get_le32(pb);
309 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
310
311 url_fskip(pb, 2 * 4);
312 get_le32(pb);
313 get_le32(pb);
314 avih_width=get_le32(pb);
315 avih_height=get_le32(pb);
316
317 url_fskip(pb, size - 10 * 4);
318 break;
319 case MKTAG('s', 't', 'r', 'h'):
320 /* stream header */
321
322 tag1 = get_le32(pb);
323 handler = get_le32(pb); /* codec tag */
324
325 if(tag1 == MKTAG('p', 'a', 'd', 's')){
326 url_fskip(pb, size - 8);
327 break;
328 }else{
329 stream_index++;
330 st = av_new_stream(s, stream_index);
331 if (!st)
332 goto fail;
333
334 ast = av_mallocz(sizeof(AVIStream));
335 if (!ast)
336 goto fail;
337 st->priv_data = ast;
338 }
339 if(amv_file_format)
340 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
341
342 #ifdef DEBUG
343 print_tag("strh", tag1, -1);
344 #endif
345 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
346 int64_t dv_dur;
347
348 /*
349 * After some consideration -- I don't think we
350 * have to support anything but DV in type1 AVIs.
351 */
352 if (s->nb_streams != 1)
353 goto fail;
354
355 if (handler != MKTAG('d', 'v', 's', 'd') &&
356 handler != MKTAG('d', 'v', 'h', 'd') &&
357 handler != MKTAG('d', 'v', 's', 'l'))
358 goto fail;
359
360 ast = s->streams[0]->priv_data;
361 av_freep(&s->streams[0]->codec->extradata);
362 av_freep(&s->streams[0]);
363 s->nb_streams = 0;
364 if (CONFIG_DV_DEMUXER) {
365 avi->dv_demux = dv_init_demux(s);
366 if (!avi->dv_demux)
367 goto fail;
368 }
369 s->streams[0]->priv_data = ast;
370 url_fskip(pb, 3 * 4);
371 ast->scale = get_le32(pb);
372 ast->rate = get_le32(pb);
373 url_fskip(pb, 4); /* start time */
374
375 dv_dur = get_le32(pb);
376 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
377 dv_dur *= AV_TIME_BASE;
378 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
379 }
380 /*
381 * else, leave duration alone; timing estimation in utils.c
382 * will make a guess based on bitrate.
383 */
384
385 stream_index = s->nb_streams - 1;
386 url_fskip(pb, size - 9*4);
387 break;
388 }
389
390 assert(stream_index < s->nb_streams);
391 st->codec->stream_codec_tag= handler;
392
393 get_le32(pb); /* flags */
394 get_le16(pb); /* priority */
395 get_le16(pb); /* language */
396 get_le32(pb); /* initial frame */
397 ast->scale = get_le32(pb);
398 ast->rate = get_le32(pb);
399 if(!(ast->scale && ast->rate)){
400 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);
401 if(frame_period){
402 ast->rate = 1000000;
403 ast->scale = frame_period;
404 }else{
405 ast->rate = 25;
406 ast->scale = 1;
407 }
408 }
409 av_set_pts_info(st, 64, ast->scale, ast->rate);
410
411 ast->cum_len=get_le32(pb); /* start */
412 nb_frames = get_le32(pb);
413
414 st->start_time = 0;
415 st->duration = nb_frames;
416 get_le32(pb); /* buffer size */
417 get_le32(pb); /* quality */
418 ast->sample_size = get_le32(pb); /* sample ssize */
419 ast->cum_len *= FFMAX(1, ast->sample_size);
420 // av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
421
422 switch(tag1) {
423 case MKTAG('v', 'i', 'd', 's'):
424 codec_type = CODEC_TYPE_VIDEO;
425
426 ast->sample_size = 0;
427 break;
428 case MKTAG('a', 'u', 'd', 's'):
429 codec_type = CODEC_TYPE_AUDIO;
430 break;
431 case MKTAG('t', 'x', 't', 's'):
432 //FIXME
433 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
434 break;
435 case MKTAG('d', 'a', 't', 's'):
436 codec_type = CODEC_TYPE_DATA;
437 break;
438 default:
439 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
440 goto fail;
441 }
442 ast->frame_offset= ast->cum_len;
443 url_fskip(pb, size - 12 * 4);
444 break;
445 case MKTAG('s', 't', 'r', 'f'):
446 /* stream header */
447 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
448 url_fskip(pb, size);
449 } else {
450 uint64_t cur_pos = url_ftell(pb);
451 if (cur_pos < list_end)
452 size = FFMIN(size, list_end - cur_pos);
453 st = s->streams[stream_index];
454 switch(codec_type) {
455 case CODEC_TYPE_VIDEO:
456 if(amv_file_format){
457 st->codec->width=avih_width;
458 st->codec->height=avih_height;
459 st->codec->codec_type = CODEC_TYPE_VIDEO;
460 st->codec->codec_id = CODEC_ID_AMV;
461 url_fskip(pb, size);
462 break;
463 }
464 get_le32(pb); /* size */
465 st->codec->width = get_le32(pb);
466 st->codec->height = (int32_t)get_le32(pb);
467 get_le16(pb); /* panes */
468 st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
469 tag1 = get_le32(pb);
470 get_le32(pb); /* ImageSize */
471 get_le32(pb); /* XPelsPerMeter */
472 get_le32(pb); /* YPelsPerMeter */
473 get_le32(pb); /* ClrUsed */
474 get_le32(pb); /* ClrImportant */
475
476 if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
477 st->codec->codec_type = CODEC_TYPE_SUBTITLE;
478 st->codec->codec_tag = tag1;
479 st->codec->codec_id = CODEC_ID_XSUB;
480 break;
481 }
482
483 if(size > 10*4 && size<(1<<30)){
484 st->codec->extradata_size= size - 10*4;
485 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
486 if (!st->codec->extradata) {
487 st->codec->extradata_size= 0;
488 return AVERROR(ENOMEM);
489 }
490 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
491 }
492
493 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
494 get_byte(pb);
495
496 /* Extract palette from extradata if bpp <= 8. */
497 /* This code assumes that extradata contains only palette. */
498 /* This is true for all paletted codecs implemented in FFmpeg. */
499 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
500 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
501 #if HAVE_BIGENDIAN
502 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
503 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
504 #else
505 memcpy(st->codec->palctrl->palette, st->codec->extradata,
506 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
507 #endif
508 st->codec->palctrl->palette_changed = 1;
509 }
510
511 #ifdef DEBUG
512 print_tag("video", tag1, 0);
513 #endif
514 st->codec->codec_type = CODEC_TYPE_VIDEO;
515 st->codec->codec_tag = tag1;
516 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
517 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
518
519 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
520 st->codec->extradata_size+= 9;
521 st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
522 if(st->codec->extradata)
523 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
524 }
525 st->codec->height= FFABS(st->codec->height);
526
527 // url_fskip(pb, size - 5 * 4);
528 break;
529 case CODEC_TYPE_AUDIO:
530 ff_get_wav_header(pb, st->codec, size);
531 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
532 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
533 ast->sample_size= st->codec->block_align;
534 }
535 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
536 url_fskip(pb, 1);
537 /* Force parsing as several audio frames can be in
538 * one packet and timestamps refer to packet start. */
539 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
540 /* ADTS header is in extradata, AAC without header must be
541 * stored as exact frames. Parser not needed and it will
542 * fail. */
543 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
544 st->need_parsing = AVSTREAM_PARSE_NONE;
545 /* AVI files with Xan DPCM audio (wrongly) declare PCM
546 * audio in the header but have Axan as stream_code_tag. */
547 if (st->codec->stream_codec_tag == AV_RL32("Axan")){
548 st->codec->codec_id = CODEC_ID_XAN_DPCM;
549 st->codec->codec_tag = 0;
550 }
551 if (amv_file_format)
552 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
553 break;
554 default:
555 st->codec->codec_type = CODEC_TYPE_DATA;
556 st->codec->codec_id= CODEC_ID_NONE;
557 st->codec->codec_tag= 0;
558 url_fskip(pb, size);
559 break;
560 }
561 }
562 break;
563 case MKTAG('i', 'n', 'd', 'x'):
564 i= url_ftell(pb);
565 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
566 read_braindead_odml_indx(s, 0);
567 }
568 url_fseek(pb, i+size, SEEK_SET);
569 break;
570 case MKTAG('v', 'p', 'r', 'p'):
571 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
572 AVRational active, active_aspect;
573
574 st = s->streams[stream_index];
575 get_le32(pb);
576 get_le32(pb);
577 get_le32(pb);
578 get_le32(pb);
579 get_le32(pb);
580
581 active_aspect.den= get_le16(pb);
582 active_aspect.num= get_le16(pb);
583 active.num = get_le32(pb);
584 active.den = get_le32(pb);
585 get_le32(pb); //nbFieldsPerFrame
586
587 if(active_aspect.num && active_aspect.den && active.num && active.den){
588 st->sample_aspect_ratio= av_div_q(active_aspect, active);
589 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
590 }
591 size -= 9*4;
592 }
593 url_fseek(pb, size, SEEK_CUR);
594 break;
595 case MKTAG('I', 'N', 'A', 'M'):
596 avi_read_tag(s, "Title", size);
597 break;
598 case MKTAG('I', 'A', 'R', 'T'):
599 avi_read_tag(s, "Artist", size);
600 break;
601 case MKTAG('I', 'C', 'O', 'P'):
602 avi_read_tag(s, "Copyright", size);
603 break;
604 case MKTAG('I', 'C', 'M', 'T'):
605 avi_read_tag(s, "Comment", size);
606 break;
607 case MKTAG('I', 'G', 'N', 'R'):
608 avi_read_tag(s, "Genre", size);
609 break;
610 case MKTAG('I', 'P', 'R', 'D'):
611 avi_read_tag(s, "Album", size);
612 break;
613 case MKTAG('I', 'P', 'R', 'T'):
614 avi_read_tag(s, "Track", size);
615 break;
616 default:
617 if(size > 1000000){
618 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
619 "I will ignore it and try to continue anyway.\n");
620 avi->movi_list = url_ftell(pb) - 4;
621 avi->movi_end = url_fsize(pb);
622 goto end_of_header;
623 }
624 /* skip tag */
625 size += (size & 1);
626 url_fskip(pb, size);
627 break;
628 }
629 }
630 end_of_header:
631 /* check stream number */
632 if (stream_index != s->nb_streams - 1) {
633 fail:
634 return -1;
635 }
636
637 if(!avi->index_loaded && !url_is_streamed(pb))
638 avi_load_index(s);
639 avi->index_loaded = 1;
640 avi->non_interleaved |= guess_ni_flag(s);
641 if(avi->non_interleaved) {
642 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
643 clean_index(s);
644 }
645
646 return 0;
647 }
648
649 static int get_stream_idx(int *d){
650 if( d[0] >= '0' && d[0] <= '9'
651 && d[1] >= '0' && d[1] <= '9'){
652 return (d[0] - '0') * 10 + (d[1] - '0');
653 }else{
654 return 100; //invalid stream ID
655 }
656 }
657
658 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
659 {
660 AVIContext *avi = s->priv_data;
661 ByteIOContext *pb = s->pb;
662 int n, d[8];
663 unsigned int size;
664 int64_t i, sync;
665 void* dstr;
666
667 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
668 int size = dv_get_packet(avi->dv_demux, pkt);
669 if (size >= 0)
670 return size;
671 }
672
673 if(avi->non_interleaved){
674 int best_stream_index = 0;
675 AVStream *best_st= NULL;
676 AVIStream *best_ast;
677 int64_t best_ts= INT64_MAX;
678 int i;
679
680 for(i=0; i<s->nb_streams; i++){
681 AVStream *st = s->streams[i];
682 AVIStream *ast = st->priv_data;
683 int64_t ts= ast->frame_offset;
684
685 if(ast->sample_size)
686 ts /= ast->sample_size;
687 ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
688
689 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
690 if(ts < best_ts && st->nb_index_entries){
691 best_ts= ts;
692 best_st= st;
693 best_stream_index= i;
694 }
695 }
696 if(!best_st)
697 return -1;
698
699 best_ast = best_st->priv_data;
700 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
701 if(best_ast->remaining)
702 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
703 else{
704 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
705 if(i>=0)
706 best_ast->frame_offset= best_st->index_entries[i].timestamp
707 * FFMAX(1, best_ast->sample_size);
708 }
709
710 // av_log(s, AV_LOG_DEBUG, "%d\n", i);
711 if(i>=0){
712 int64_t pos= best_st->index_entries[i].pos;
713 pos += best_ast->packet_size - best_ast->remaining;
714 url_fseek(s->pb, pos + 8, SEEK_SET);
715 // av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
716
717 assert(best_ast->remaining <= best_ast->packet_size);
718
719 avi->stream_index= best_stream_index;
720 if(!best_ast->remaining)
721 best_ast->packet_size=
722 best_ast->remaining= best_st->index_entries[i].size;
723 }
724 }
725
726 resync:
727 if(avi->stream_index >= 0){
728 AVStream *st= s->streams[ avi->stream_index ];
729 AVIStream *ast= st->priv_data;
730 int size, err;
731
732 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
733 size= INT_MAX;
734 else if(ast->sample_size < 32)
735 size= 64*ast->sample_size;
736 else
737 size= ast->sample_size;
738
739 if(size > ast->remaining)
740 size= ast->remaining;
741 avi->last_pkt_pos= url_ftell(pb);
742 err= av_get_packet(pb, pkt, size);
743 if(err<0)
744 return err;
745
746 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
747 void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
748 if(ptr){
749 ast->has_pal=0;
750 pkt->size += 4*256;
751 pkt->data= ptr;
752 memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
753 }else
754 av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
755 }
756
757 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
758 dstr = pkt->destruct;
759 size = dv_produce_packet(avi->dv_demux, pkt,
760 pkt->data, pkt->size);
761 pkt->destruct = dstr;
762 pkt->flags |= PKT_FLAG_KEY;
763 } else {
764 /* XXX: How to handle B-frames in AVI? */
765 pkt->dts = ast->frame_offset;
766 // pkt->dts += ast->start;
767 if(ast->sample_size)
768 pkt->dts /= ast->sample_size;
769 //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);
770 pkt->stream_index = avi->stream_index;
771
772 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
773 AVIndexEntry *e;
774 int index;
775 assert(st->index_entries);
776
777 index= av_index_search_timestamp(st, pkt->dts, 0);
778 e= &st->index_entries[index];
779
780 if(index >= 0 && e->timestamp == ast->frame_offset){
781 if (e->flags & AVINDEX_KEYFRAME)
782 pkt->flags |= PKT_FLAG_KEY;
783 }
784 } else {
785 pkt->flags |= PKT_FLAG_KEY;
786 }
787 if(ast->sample_size)
788 ast->frame_offset += pkt->size;
789 else
790 ast->frame_offset++;
791 }
792 ast->remaining -= size;
793 if(!ast->remaining){
794 avi->stream_index= -1;
795 ast->packet_size= 0;
796 }
797
798 return size;
799 }
800
801 memset(d, -1, sizeof(int)*8);
802 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
803 int j;
804
805 for(j=0; j<7; j++)
806 d[j]= d[j+1];
807 d[7]= get_byte(pb);
808
809 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
810
811 n= get_stream_idx(d+2);
812 //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);
813 if(i + (uint64_t)size > avi->fsize || d[0]<0)
814 continue;
815
816 //parse ix##
817 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
818 //parse JUNK
819 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
820 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
821 url_fskip(pb, size);
822 //av_log(s, AV_LOG_DEBUG, "SKIP\n");
823 goto resync;
824 }
825
826 n= get_stream_idx(d);
827
828 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
829 continue;
830
831 //parse ##dc/##wb
832 if(n < s->nb_streams){
833 AVStream *st;
834 AVIStream *ast;
835 st = s->streams[n];
836 ast = st->priv_data;
837
838 if(s->nb_streams>=2){
839 AVStream *st1 = s->streams[1];
840 AVIStream *ast1= st1->priv_data;
841 //workaround for broken small-file-bug402.avi
842 if( d[2] == 'w' && d[3] == 'b'
843 && n==0
844 && st ->codec->codec_type == CODEC_TYPE_VIDEO
845 && st1->codec->codec_type == CODEC_TYPE_AUDIO
846 && ast->prefix == 'd'*256+'c'
847 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
848 ){
849 n=1;
850 st = st1;
851 ast = ast1;
852 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
853 }
854 }
855
856
857 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
858 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
859 || st->discard >= AVDISCARD_ALL){
860 if(ast->sample_size) ast->frame_offset += pkt->size;
861 else ast->frame_offset++;
862 url_fskip(pb, size);
863 goto resync;
864 }
865
866 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
867 int k = get_byte(pb);
868 int last = (k + get_byte(pb) - 1) & 0xFF;
869
870 get_le16(pb); //flags
871
872 for (; k <= last; k++)
873 ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
874 ast->has_pal= 1;
875 goto resync;
876 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
877 d[2]*256+d[3] == ast->prefix /*||
878 (d[2] == 'd' && d[3] == 'c') ||
879 (d[2] == 'w' && d[3] == 'b')*/) {
880
881 //av_log(s, AV_LOG_DEBUG, "OK\n");
882 if(d[2]*256+d[3] == ast->prefix)
883 ast->prefix_count++;
884 else{
885 ast->prefix= d[2]*256+d[3];
886 ast->prefix_count= 0;
887 }
888
889 avi->stream_index= n;
890 ast->packet_size= size + 8;
891 ast->remaining= size;
892
893 {
894 uint64_t pos= url_ftell(pb) - 8;
895 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
896 av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
897 }
898 }
899 goto resync;
900 }
901 }
902 }
903
904 return AVERROR_EOF;
905 }
906
907 /* XXX: We make the implicit supposition that the positions are sorted
908 for each stream. */
909 static int avi_read_idx1(AVFormatContext *s, int size)
910 {
911 AVIContext *avi = s->priv_data;
912 ByteIOContext *pb = s->pb;
913 int nb_index_entries, i;
914 AVStream *st;
915 AVIStream *ast;
916 unsigned int index, tag, flags, pos, len;
917 unsigned last_pos= -1;
918
919 nb_index_entries = size / 16;
920 if (nb_index_entries <= 0)
921 return -1;
922
923 /* Read the entries and sort them in each stream component. */
924 for(i = 0; i < nb_index_entries; i++) {
925 tag = get_le32(pb);
926 flags = get_le32(pb);
927 pos = get_le32(pb);
928 len = get_le32(pb);
929 #if defined(DEBUG_SEEK)
930 av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
931 i, tag, flags, pos, len);
932 #endif
933 if(i==0 && pos > avi->movi_list)
934 avi->movi_list= 0; //FIXME better check
935 pos += avi->movi_list;
936
937 index = ((tag & 0xff) - '0') * 10;
938 index += ((tag >> 8) & 0xff) - '0';
939 if (index >= s->nb_streams)
940 continue;
941 st = s->streams[index];
942 ast = st->priv_data;
943
944 #if defined(DEBUG_SEEK)
945 av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
946 #endif
947 if(url_feof(pb))
948 return -1;
949
950 if(last_pos == pos)
951 avi->non_interleaved= 1;
952 else
953 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
954 if(ast->sample_size)
955 ast->cum_len += len;
956 else
957 ast->cum_len ++;
958 last_pos= pos;
959 }
960 return 0;
961 }
962
963 static int guess_ni_flag(AVFormatContext *s){
964 int i;
965 int64_t last_start=0;
966 int64_t first_end= INT64_MAX;
967 int64_t oldpos= url_ftell(s->pb);
968
969 for(i=0; i<s->nb_streams; i++){
970 AVStream *st = s->streams[i];
971 int n= st->nb_index_entries;
972 unsigned int size;
973
974 if(n <= 0)
975 continue;
976
977 if(n >= 2){
978 int64_t pos= st->index_entries[0].pos;
979 url_fseek(s->pb, pos + 4, SEEK_SET);
980 size= get_le32(s->pb);
981 if(pos + size > st->index_entries[1].pos)
982 last_start= INT64_MAX;
983 }
984
985 if(st->index_entries[0].pos > last_start)
986 last_start= st->index_entries[0].pos;
987 if(st->index_entries[n-1].pos < first_end)
988 first_end= st->index_entries[n-1].pos;
989 }
990 url_fseek(s->pb, oldpos, SEEK_SET);
991 return last_start > first_end;
992 }
993
994 static int avi_load_index(AVFormatContext *s)
995 {
996 AVIContext *avi = s->priv_data;
997 ByteIOContext *pb = s->pb;
998 uint32_t tag, size;
999 int64_t pos= url_ftell(pb);
1000
1001 url_fseek(pb, avi->movi_end, SEEK_SET);
1002 #ifdef DEBUG_SEEK
1003 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1004 #endif
1005 for(;;) {
1006 if (url_feof(pb))
1007 break;
1008 tag = get_le32(pb);
1009 size = get_le32(pb);
1010 #ifdef DEBUG_SEEK
1011 printf("tag=%c%c%c%c size=0x%x\n",
1012 tag & 0xff,
1013 (tag >> 8) & 0xff,
1014 (tag >> 16) & 0xff,
1015 (tag >> 24) & 0xff,
1016 size);
1017 #endif
1018 switch(tag) {
1019 case MKTAG('i', 'd', 'x', '1'):
1020 if (avi_read_idx1(s, size) < 0)
1021 goto skip;
1022 else
1023 goto the_end;
1024 break;
1025 default:
1026 skip:
1027 size += (size & 1);
1028 url_fskip(pb, size);
1029 break;
1030 }
1031 }
1032 the_end:
1033 url_fseek(pb, pos, SEEK_SET);
1034 return 0;
1035 }
1036
1037 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1038 {
1039 AVIContext *avi = s->priv_data;
1040 AVStream *st;
1041 int i, index;
1042 int64_t pos;
1043
1044 if (!avi->index_loaded) {
1045 /* we only load the index on demand */
1046 avi_load_index(s);
1047 avi->index_loaded = 1;
1048 }
1049 assert(stream_index>= 0);
1050
1051 st = s->streams[stream_index];
1052 index= av_index_search_timestamp(st, timestamp, flags);
1053 if(index<0)
1054 return -1;
1055
1056 /* find the position */
1057 pos = st->index_entries[index].pos;
1058 timestamp = st->index_entries[index].timestamp;
1059
1060 // av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1061
1062 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1063 /* One and only one real stream for DV in AVI, and it has video */
1064 /* offsets. Calling with other stream indexes should have failed */
1065 /* the av_index_search_timestamp call above. */
1066 assert(stream_index == 0);
1067
1068 /* Feed the DV video stream version of the timestamp to the */
1069 /* DV demux so it can synthesize correct timestamps. */
1070 dv_offset_reset(avi->dv_demux, timestamp);
1071
1072 url_fseek(s->pb, pos, SEEK_SET);
1073 avi->stream_index= -1;
1074 return 0;
1075 }
1076
1077 for(i = 0; i < s->nb_streams; i++) {
1078 AVStream *st2 = s->streams[i];
1079 AVIStream *ast2 = st2->priv_data;
1080
1081 ast2->packet_size=
1082 ast2->remaining= 0;
1083
1084 if (st2->nb_index_entries <= 0)
1085 continue;
1086
1087 // assert(st2->codec->block_align);
1088 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1089 index = av_index_search_timestamp(
1090 st2,
1091 av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
1092 flags | AVSEEK_FLAG_BACKWARD);
1093 if(index<0)
1094 index=0;
1095
1096 if(!avi->non_interleaved){
1097 while(index>0 && st2->index_entries[index].pos > pos)
1098 index--;
1099 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1100 index++;
1101 }
1102
1103 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1104 /* extract the current frame number */
1105 ast2->frame_offset = st2->index_entries[index].timestamp;
1106 if(ast2->sample_size)
1107 ast2->frame_offset *=ast2->sample_size;
1108 }
1109
1110 /* do the seek */
1111 url_fseek(s->pb, pos, SEEK_SET);
1112 avi->stream_index= -1;
1113 return 0;
1114 }
1115
1116 static int avi_read_close(AVFormatContext *s)
1117 {
1118 int i;
1119 AVIContext *avi = s->priv_data;
1120
1121 for(i=0;i<s->nb_streams;i++) {
1122 AVStream *st = s->streams[i];
1123 av_free(st->codec->palctrl);
1124 }
1125
1126 if (avi->dv_demux)
1127 av_free(avi->dv_demux);
1128
1129 return 0;
1130 }
1131
1132 static int avi_probe(AVProbeData *p)
1133 {
1134 int i;
1135
1136 /* check file header */
1137 for(i=0; avi_headers[i][0]; i++)
1138 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1139 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1140 return AVPROBE_SCORE_MAX;
1141
1142 return 0;
1143 }
1144
1145 AVInputFormat avi_demuxer = {
1146 "avi",
1147 NULL_IF_CONFIG_SMALL("AVI format"),
1148 sizeof(AVIContext),
1149 avi_probe,
1150 avi_read_header,
1151 avi_read_packet,
1152 avi_read_close,
1153 avi_read_seek,
1154 };