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