Fixes NULL pointer dereference CID66
[libav.git] / libavformat / avidec.c
1 /*
2 * AVI demuxer
3 * Copyright (c) 2001 Fabrice Bellard.
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21 #include "avformat.h"
22 #include "avi.h"
23 #include "dv.h"
24 #include "riff.h"
25
26 #undef NDEBUG
27 #include <assert.h>
28
29 //#define DEBUG
30 //#define DEBUG_SEEK
31
32 typedef struct AVIStream {
33 int64_t frame_offset; /* current frame (video) or byte (audio) counter
34 (used to compute the pts) */
35 int remaining;
36 int packet_size;
37
38 int scale;
39 int rate;
40 int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
41
42 int64_t cum_len; /* temporary storage (used during seek) */
43
44 int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
45 int prefix_count;
46 uint32_t pal[256];
47 int has_pal;
48 } AVIStream;
49
50 typedef struct {
51 int64_t riff_end;
52 int64_t movi_end;
53 int64_t fsize;
54 offset_t movi_list;
55 int index_loaded;
56 int is_odml;
57 int non_interleaved;
58 int stream_index;
59 DVDemuxContext* dv_demux;
60 } AVIContext;
61
62 static const char avi_headers[][8] = {
63 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
64 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
65 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
66 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
67 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
68 { 0 }
69 };
70
71 static int avi_load_index(AVFormatContext *s);
72 static int guess_ni_flag(AVFormatContext *s);
73
74 #ifdef DEBUG
75 static void print_tag(const char *str, unsigned int tag, int size)
76 {
77 printf("%s: tag=%c%c%c%c size=0x%x\n",
78 str, tag & 0xff,
79 (tag >> 8) & 0xff,
80 (tag >> 16) & 0xff,
81 (tag >> 24) & 0xff,
82 size);
83 }
84 #endif
85
86 static int get_riff(AVIContext *avi, ByteIOContext *pb)
87 {
88 char header[8];
89 int i;
90
91 /* check RIFF header */
92 get_buffer(pb, header, 4);
93 avi->riff_end = get_le32(pb); /* RIFF chunk size */
94 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
95 get_buffer(pb, header+4, 4);
96
97 for(i=0; avi_headers[i][0]; i++)
98 if(!memcmp(header, avi_headers[i], 8))
99 break;
100 if(!avi_headers[i][0])
101 return -1;
102
103 if(header[7] == 0x19)
104 av_log(NULL, AV_LOG_INFO, "file has been generated with a totally broken muxer\n");
105
106 return 0;
107 }
108
109 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
110 AVIContext *avi = s->priv_data;
111 ByteIOContext *pb = s->pb;
112 int longs_pre_entry= get_le16(pb);
113 int index_sub_type = get_byte(pb);
114 int index_type = get_byte(pb);
115 int entries_in_use = get_le32(pb);
116 int chunk_id = get_le32(pb);
117 int64_t base = get_le64(pb);
118 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
119 AVStream *st;
120 AVIStream *ast;
121 int i;
122 int64_t last_pos= -1;
123 int64_t filesize= url_fsize(s->pb);
124
125 #ifdef DEBUG_SEEK
126 av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
127 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
128 #endif
129
130 if(stream_id > s->nb_streams || stream_id < 0)
131 return -1;
132 st= s->streams[stream_id];
133 ast = st->priv_data;
134
135 if(index_sub_type)
136 return -1;
137
138 get_le32(pb);
139
140 if(index_type && longs_pre_entry != 2)
141 return -1;
142 if(index_type>1)
143 return -1;
144
145 if(filesize > 0 && base >= filesize){
146 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
147 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
148 base &= 0xFFFFFFFF;
149 else
150 return -1;
151 }
152
153 for(i=0; i<entries_in_use; i++){
154 if(index_type){
155 int64_t pos= get_le32(pb) + base - 8;
156 int len = get_le32(pb);
157 int key= len >= 0;
158 len &= 0x7FFFFFFF;
159
160 #ifdef DEBUG_SEEK
161 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
162 #endif
163 if(last_pos == pos || pos == base - 8)
164 avi->non_interleaved= 1;
165 else
166 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
167
168 if(ast->sample_size)
169 ast->cum_len += len;
170 else
171 ast->cum_len ++;
172 last_pos= pos;
173 }else{
174 int64_t offset, pos;
175 int duration;
176 offset = get_le64(pb);
177 get_le32(pb); /* size */
178 duration = get_le32(pb);
179 pos = url_ftell(pb);
180
181 url_fseek(pb, offset+8, SEEK_SET);
182 read_braindead_odml_indx(s, frame_num);
183 frame_num += duration;
184
185 url_fseek(pb, pos, SEEK_SET);
186 }
187 }
188 avi->index_loaded=1;
189 return 0;
190 }
191
192 static void clean_index(AVFormatContext *s){
193 int i;
194 int64_t j;
195
196 for(i=0; i<s->nb_streams; i++){
197 AVStream *st = s->streams[i];
198 AVIStream *ast = st->priv_data;
199 int n= st->nb_index_entries;
200 int max= ast->sample_size;
201 int64_t pos, size, ts;
202
203 if(n != 1 || ast->sample_size==0)
204 continue;
205
206 while(max < 1024) max+=max;
207
208 pos= st->index_entries[0].pos;
209 size= st->index_entries[0].size;
210 ts= st->index_entries[0].timestamp;
211
212 for(j=0; j<size; j+=max){
213 av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
214 }
215 }
216 }
217
218 static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen, unsigned int size)
219 {
220 offset_t i = url_ftell(pb);
221 size += (size & 1);
222 get_strz(pb, buf, maxlen);
223 url_fseek(pb, i+size, SEEK_SET);
224 return 0;
225 }
226
227 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
228 {
229 AVIContext *avi = s->priv_data;
230 ByteIOContext *pb = s->pb;
231 uint32_t tag, tag1, handler;
232 int codec_type, stream_index, frame_period, bit_rate;
233 unsigned int size, nb_frames;
234 int i;
235 AVStream *st;
236 AVIStream *ast = NULL;
237 char str_track[4];
238 int avih_width=0, avih_height=0;
239 int amv_file_format=0;
240
241 avi->stream_index= -1;
242
243 if (get_riff(avi, pb) < 0)
244 return -1;
245
246 avi->fsize = url_fsize(pb);
247 if(avi->fsize<=0)
248 avi->fsize= avi->riff_end;
249
250 /* first list tag */
251 stream_index = -1;
252 codec_type = -1;
253 frame_period = 0;
254 for(;;) {
255 if (url_feof(pb))
256 goto fail;
257 tag = get_le32(pb);
258 size = get_le32(pb);
259 #ifdef DEBUG
260 print_tag("tag", tag, size);
261 #endif
262
263 switch(tag) {
264 case MKTAG('L', 'I', 'S', 'T'):
265 /* ignored, except when start of video packets */
266 tag1 = get_le32(pb);
267 #ifdef DEBUG
268 print_tag("list", tag1, 0);
269 #endif
270 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
271 avi->movi_list = url_ftell(pb) - 4;
272 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
273 else avi->movi_end = url_fsize(pb);
274 #ifdef DEBUG
275 printf("movi end=%"PRIx64"\n", avi->movi_end);
276 #endif
277 goto end_of_header;
278 }
279 break;
280 case MKTAG('d', 'm', 'l', 'h'):
281 avi->is_odml = 1;
282 url_fskip(pb, size + (size & 1));
283 break;
284 case MKTAG('a', 'm', 'v', 'h'):
285 amv_file_format=1;
286 case MKTAG('a', 'v', 'i', 'h'):
287 /* avi header */
288 /* using frame_period is bad idea */
289 frame_period = get_le32(pb);
290 bit_rate = get_le32(pb) * 8;
291 get_le32(pb);
292 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
293
294 url_fskip(pb, 2 * 4);
295 get_le32(pb);
296 get_le32(pb);
297 avih_width=get_le32(pb);
298 avih_height=get_le32(pb);
299
300 url_fskip(pb, size - 10 * 4);
301 break;
302 case MKTAG('s', 't', 'r', 'h'):
303 /* stream header */
304
305 tag1 = get_le32(pb);
306 handler = get_le32(pb); /* codec tag */
307
308 if(tag1 == MKTAG('p', 'a', 'd', 's')){
309 url_fskip(pb, size - 8);
310 break;
311 }else{
312 stream_index++;
313 st = av_new_stream(s, stream_index);
314 if (!st)
315 goto fail;
316
317 ast = av_mallocz(sizeof(AVIStream));
318 if (!ast)
319 goto fail;
320 st->priv_data = ast;
321 }
322 if(amv_file_format)
323 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
324
325 #ifdef DEBUG
326 print_tag("strh", tag1, -1);
327 #endif
328 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
329 int64_t dv_dur;
330
331 /*
332 * After some consideration -- I don't think we
333 * have to support anything but DV in a type1 AVIs.
334 */
335 if (s->nb_streams != 1)
336 goto fail;
337
338 if (handler != MKTAG('d', 'v', 's', 'd') &&
339 handler != MKTAG('d', 'v', 'h', 'd') &&
340 handler != MKTAG('d', 'v', 's', 'l'))
341 goto fail;
342
343 ast = s->streams[0]->priv_data;
344 av_freep(&s->streams[0]->codec->extradata);
345 av_freep(&s->streams[0]);
346 s->nb_streams = 0;
347 if (ENABLE_DV_DEMUXER) {
348 avi->dv_demux = dv_init_demux(s);
349 if (!avi->dv_demux)
350 goto fail;
351 }
352 s->streams[0]->priv_data = ast;
353 url_fskip(pb, 3 * 4);
354 ast->scale = get_le32(pb);
355 ast->rate = get_le32(pb);
356 url_fskip(pb, 4); /* start time */
357
358 dv_dur = get_le32(pb);
359 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
360 dv_dur *= AV_TIME_BASE;
361 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
362 }
363 /*
364 * else, leave duration alone; timing estimation in utils.c
365 * will make a guess based on bit rate.
366 */
367
368 stream_index = s->nb_streams - 1;
369 url_fskip(pb, size - 9*4);
370 break;
371 }
372
373 assert(stream_index < s->nb_streams);
374 st->codec->stream_codec_tag= handler;
375
376 get_le32(pb); /* flags */
377 get_le16(pb); /* priority */
378 get_le16(pb); /* language */
379 get_le32(pb); /* initial frame */
380 ast->scale = get_le32(pb);
381 ast->rate = get_le32(pb);
382 if(!(ast->scale && ast->rate)){
383 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);
384 if(frame_period){
385 ast->rate = 1000000;
386 ast->scale = frame_period;
387 }else{
388 ast->rate = 25;
389 ast->scale = 1;
390 }
391 }
392 av_set_pts_info(st, 64, ast->scale, ast->rate);
393
394 ast->cum_len=get_le32(pb); /* start */
395 nb_frames = get_le32(pb);
396
397 st->start_time = 0;
398 st->duration = nb_frames;
399 get_le32(pb); /* buffer size */
400 get_le32(pb); /* quality */
401 ast->sample_size = get_le32(pb); /* sample ssize */
402 ast->cum_len *= FFMAX(1, ast->sample_size);
403 // av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
404
405 switch(tag1) {
406 case MKTAG('v', 'i', 'd', 's'):
407 codec_type = CODEC_TYPE_VIDEO;
408
409 ast->sample_size = 0;
410 break;
411 case MKTAG('a', 'u', 'd', 's'):
412 codec_type = CODEC_TYPE_AUDIO;
413 break;
414 case MKTAG('t', 'x', 't', 's'):
415 //FIXME
416 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
417 break;
418 default:
419 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
420 goto fail;
421 }
422 ast->frame_offset= ast->cum_len;
423 url_fskip(pb, size - 12 * 4);
424 break;
425 case MKTAG('s', 't', 'r', 'f'):
426 /* stream header */
427 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
428 url_fskip(pb, size);
429 } else {
430 st = s->streams[stream_index];
431 switch(codec_type) {
432 case CODEC_TYPE_VIDEO:
433 if(amv_file_format){
434 st->codec->width=avih_width;
435 st->codec->height=avih_height;
436 st->codec->codec_type = CODEC_TYPE_VIDEO;
437 st->codec->codec_id = CODEC_ID_AMV;
438 url_fskip(pb, size);
439 break;
440 }
441 get_le32(pb); /* size */
442 st->codec->width = get_le32(pb);
443 st->codec->height = get_le32(pb);
444 get_le16(pb); /* panes */
445 st->codec->bits_per_sample= get_le16(pb); /* depth */
446 tag1 = get_le32(pb);
447 get_le32(pb); /* ImageSize */
448 get_le32(pb); /* XPelsPerMeter */
449 get_le32(pb); /* YPelsPerMeter */
450 get_le32(pb); /* ClrUsed */
451 get_le32(pb); /* ClrImportant */
452
453 if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
454 st->codec->codec_type = CODEC_TYPE_SUBTITLE;
455 st->codec->codec_tag = tag1;
456 st->codec->codec_id = CODEC_ID_XSUB;
457 break;
458 }
459
460 if(size > 10*4 && size<(1<<30)){
461 st->codec->extradata_size= size - 10*4;
462 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
463 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
464 }
465
466 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
467 get_byte(pb);
468
469 /* Extract palette from extradata if bpp <= 8 */
470 /* This code assumes that extradata contains only palette */
471 /* This is true for all paletted codecs implemented in ffmpeg */
472 if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
473 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
474 #ifdef WORDS_BIGENDIAN
475 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
476 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
477 #else
478 memcpy(st->codec->palctrl->palette, st->codec->extradata,
479 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
480 #endif
481 st->codec->palctrl->palette_changed = 1;
482 }
483
484 #ifdef DEBUG
485 print_tag("video", tag1, 0);
486 #endif
487 st->codec->codec_type = CODEC_TYPE_VIDEO;
488 st->codec->codec_tag = tag1;
489 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
490 st->need_parsing = AVSTREAM_PARSE_HEADERS; // this is needed to get the pict type which is needed for generating correct pts
491 // url_fskip(pb, size - 5 * 4);
492 break;
493 case CODEC_TYPE_AUDIO:
494 get_wav_header(pb, st->codec, size);
495 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
496 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
497 ast->sample_size= st->codec->block_align;
498 }
499 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
500 url_fskip(pb, 1);
501 /* Force parsing as several audio frames can be in
502 * one packet and timestamps refer to packet start*/
503 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
504 /* ADTS header is in extradata, AAC without header must be stored as exact frames, parser not needed and it will fail */
505 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
506 st->need_parsing = AVSTREAM_PARSE_NONE;
507 /* AVI files with Xan DPCM audio (wrongly) declare PCM
508 * audio in the header but have Axan as stream_code_tag. */
509 if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){
510 st->codec->codec_id = CODEC_ID_XAN_DPCM;
511 st->codec->codec_tag = 0;
512 }
513 if (amv_file_format)
514 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
515 break;
516 default:
517 st->codec->codec_type = CODEC_TYPE_DATA;
518 st->codec->codec_id= CODEC_ID_NONE;
519 st->codec->codec_tag= 0;
520 url_fskip(pb, size);
521 break;
522 }
523 }
524 break;
525 case MKTAG('i', 'n', 'd', 'x'):
526 i= url_ftell(pb);
527 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
528 read_braindead_odml_indx(s, 0);
529 }
530 url_fseek(pb, i+size, SEEK_SET);
531 break;
532 case MKTAG('v', 'p', 'r', 'p'):
533 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
534 AVRational active, active_aspect;
535
536 st = s->streams[stream_index];
537 get_le32(pb);
538 get_le32(pb);
539 get_le32(pb);
540 get_le32(pb);
541 get_le32(pb);
542
543 active_aspect.den= get_le16(pb);
544 active_aspect.num= get_le16(pb);
545 active.num = get_le32(pb);
546 active.den = get_le32(pb);
547 get_le32(pb); //nbFieldsPerFrame
548
549 if(active_aspect.num && active_aspect.den && active.num && active.den){
550 st->codec->sample_aspect_ratio= av_div_q(active_aspect, active);
551 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
552 }
553 size -= 9*4;
554 }
555 url_fseek(pb, size, SEEK_CUR);
556 break;
557 case MKTAG('I', 'N', 'A', 'M'):
558 avi_read_tag(pb, s->title, sizeof(s->title), size);
559 break;
560 case MKTAG('I', 'A', 'R', 'T'):
561 avi_read_tag(pb, s->author, sizeof(s->author), size);
562 break;
563 case MKTAG('I', 'C', 'O', 'P'):
564 avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
565 break;
566 case MKTAG('I', 'C', 'M', 'T'):
567 avi_read_tag(pb, s->comment, sizeof(s->comment), size);
568 break;
569 case MKTAG('I', 'G', 'N', 'R'):
570 avi_read_tag(pb, s->genre, sizeof(s->genre), size);
571 break;
572 case MKTAG('I', 'P', 'R', 'D'):
573 avi_read_tag(pb, s->album, sizeof(s->album), size);
574 break;
575 case MKTAG('I', 'P', 'R', 'T'):
576 avi_read_tag(pb, str_track, sizeof(str_track), size);
577 sscanf(str_track, "%d", &s->track);
578 break;
579 default:
580 if(size > 1000000){
581 av_log(s, AV_LOG_ERROR, "well something went wrong during header parsing, "
582 "ill ignore it and try to continue anyway\n");
583 avi->movi_list = url_ftell(pb) - 4;
584 avi->movi_end = url_fsize(pb);
585 goto end_of_header;
586 }
587 /* skip tag */
588 size += (size & 1);
589 url_fskip(pb, size);
590 break;
591 }
592 }
593 end_of_header:
594 /* check stream number */
595 if (stream_index != s->nb_streams - 1) {
596 fail:
597 for(i=0;i<s->nb_streams;i++) {
598 av_freep(&s->streams[i]->codec->extradata);
599 av_freep(&s->streams[i]);
600 }
601 return -1;
602 }
603
604 if(!avi->index_loaded && !url_is_streamed(pb))
605 avi_load_index(s);
606 avi->index_loaded = 1;
607 avi->non_interleaved |= guess_ni_flag(s);
608 if(avi->non_interleaved) {
609 av_log(s, AV_LOG_INFO, "Non interleaved AVI\n");
610 clean_index(s);
611 }
612
613 return 0;
614 }
615
616 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
617 {
618 AVIContext *avi = s->priv_data;
619 ByteIOContext *pb = s->pb;
620 int n, d[8], size;
621 offset_t i, sync;
622 void* dstr;
623
624 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
625 size = dv_get_packet(avi->dv_demux, pkt);
626 if (size >= 0)
627 return size;
628 }
629
630 if(avi->non_interleaved){
631 int best_stream_index = 0;
632 AVStream *best_st= NULL;
633 AVIStream *best_ast;
634 int64_t best_ts= INT64_MAX;
635 int i;
636
637 for(i=0; i<s->nb_streams; i++){
638 AVStream *st = s->streams[i];
639 AVIStream *ast = st->priv_data;
640 int64_t ts= ast->frame_offset;
641
642 if(ast->sample_size)
643 ts /= ast->sample_size;
644 ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
645
646 // av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
647 if(ts < best_ts && st->nb_index_entries){
648 best_ts= ts;
649 best_st= st;
650 best_stream_index= i;
651 }
652 }
653 if(!best_st)
654 return -1;
655
656 best_ast = best_st->priv_data;
657 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
658 if(best_ast->remaining)
659 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
660 else
661 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
662
663 // av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
664 if(i>=0){
665 int64_t pos= best_st->index_entries[i].pos;
666 pos += best_ast->packet_size - best_ast->remaining;
667 url_fseek(s->pb, pos + 8, SEEK_SET);
668 // av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
669
670 assert(best_ast->remaining <= best_ast->packet_size);
671
672 avi->stream_index= best_stream_index;
673 if(!best_ast->remaining)
674 best_ast->packet_size=
675 best_ast->remaining= best_st->index_entries[i].size;
676 }
677 }
678
679 resync:
680 if(avi->stream_index >= 0){
681 AVStream *st= s->streams[ avi->stream_index ];
682 AVIStream *ast= st->priv_data;
683 int size;
684
685 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
686 size= INT_MAX;
687 else if(ast->sample_size < 32)
688 size= 64*ast->sample_size;
689 else
690 size= ast->sample_size;
691
692 if(size > ast->remaining)
693 size= ast->remaining;
694 av_get_packet(pb, pkt, size);
695
696 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
697 ast->has_pal=0;
698 pkt->size += 4*256;
699 pkt->data = av_realloc(pkt->data, pkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
700 if(pkt->data)
701 memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
702 }
703
704 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
705 dstr = pkt->destruct;
706 size = dv_produce_packet(avi->dv_demux, pkt,
707 pkt->data, pkt->size);
708 pkt->destruct = dstr;
709 pkt->flags |= PKT_FLAG_KEY;
710 } else {
711 /* XXX: how to handle B frames in avi ? */
712 pkt->dts = ast->frame_offset;
713 // pkt->dts += ast->start;
714 if(ast->sample_size)
715 pkt->dts /= ast->sample_size;
716 //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);
717 pkt->stream_index = avi->stream_index;
718
719 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
720 AVIndexEntry *e;
721 int index;
722 assert(st->index_entries);
723
724 index= av_index_search_timestamp(st, pkt->dts, 0);
725 e= &st->index_entries[index];
726
727 if(index >= 0 && e->timestamp == ast->frame_offset){
728 if (e->flags & AVINDEX_KEYFRAME)
729 pkt->flags |= PKT_FLAG_KEY;
730 }
731 } else {
732 pkt->flags |= PKT_FLAG_KEY;
733 }
734 if(ast->sample_size)
735 ast->frame_offset += pkt->size;
736 else
737 ast->frame_offset++;
738 }
739 ast->remaining -= size;
740 if(!ast->remaining){
741 avi->stream_index= -1;
742 ast->packet_size= 0;
743 }
744
745 return size;
746 }
747
748 memset(d, -1, sizeof(int)*8);
749 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
750 int j;
751
752 for(j=0; j<7; j++)
753 d[j]= d[j+1];
754 d[7]= get_byte(pb);
755
756 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
757
758 if( d[2] >= '0' && d[2] <= '9'
759 && d[3] >= '0' && d[3] <= '9'){
760 n= (d[2] - '0') * 10 + (d[3] - '0');
761 }else{
762 n= 100; //invalid stream id
763 }
764 //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);
765 if(i + size > avi->fsize || d[0]<0)
766 continue;
767
768 //parse ix##
769 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
770 //parse JUNK
771 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
772 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
773 url_fskip(pb, size);
774 //av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
775 goto resync;
776 }
777
778 if( d[0] >= '0' && d[0] <= '9'
779 && d[1] >= '0' && d[1] <= '9'){
780 n= (d[0] - '0') * 10 + (d[1] - '0');
781 }else{
782 n= 100; //invalid stream id
783 }
784
785 //parse ##dc/##wb
786 if(n < s->nb_streams){
787 AVStream *st;
788 AVIStream *ast;
789 st = s->streams[n];
790 ast = st->priv_data;
791
792 if(s->nb_streams>=2){
793 AVStream *st1 = s->streams[1];
794 AVIStream *ast1= st1->priv_data;
795 //workaround for broken small-file-bug402.avi
796 if( d[2] == 'w' && d[3] == 'b'
797 && n==0
798 && st ->codec->codec_type == CODEC_TYPE_VIDEO
799 && st1->codec->codec_type == CODEC_TYPE_AUDIO
800 && ast->prefix == 'd'*256+'c'
801 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
802 ){
803 n=1;
804 st = st1;
805 ast = ast1;
806 av_log(s, AV_LOG_WARNING, "Invalid stream+prefix combination, assuming audio\n");
807 }
808 }
809
810
811 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
812 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
813 || st->discard >= AVDISCARD_ALL){
814 if(ast->sample_size) ast->frame_offset += pkt->size;
815 else ast->frame_offset++;
816 url_fskip(pb, size);
817 goto resync;
818 }
819
820 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
821 int k = get_byte(pb);
822 int last = (k + get_byte(pb) - 1) & 0xFF;
823
824 get_le16(pb); //flags
825
826 for (; k <= last; k++)
827 ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
828 ast->has_pal= 1;
829 goto resync;
830 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
831 d[2]*256+d[3] == ast->prefix /*||
832 (d[2] == 'd' && d[3] == 'c') ||
833 (d[2] == 'w' && d[3] == 'b')*/) {
834
835 //av_log(NULL, AV_LOG_DEBUG, "OK\n");
836 if(d[2]*256+d[3] == ast->prefix)
837 ast->prefix_count++;
838 else{
839 ast->prefix= d[2]*256+d[3];
840 ast->prefix_count= 0;
841 }
842
843 avi->stream_index= n;
844 ast->packet_size= size + 8;
845 ast->remaining= size;
846
847 {
848 uint64_t pos= url_ftell(pb) - 8;
849 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
850 av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
851 }
852 }
853 goto resync;
854 }
855 }
856 }
857
858 return -1;
859 }
860
861 /* XXX: we make the implicit supposition that the position are sorted
862 for each stream */
863 static int avi_read_idx1(AVFormatContext *s, int size)
864 {
865 AVIContext *avi = s->priv_data;
866 ByteIOContext *pb = s->pb;
867 int nb_index_entries, i;
868 AVStream *st;
869 AVIStream *ast;
870 unsigned int index, tag, flags, pos, len;
871 unsigned last_pos= -1;
872
873 nb_index_entries = size / 16;
874 if (nb_index_entries <= 0)
875 return -1;
876
877 /* read the entries and sort them in each stream component */
878 for(i = 0; i < nb_index_entries; i++) {
879 tag = get_le32(pb);
880 flags = get_le32(pb);
881 pos = get_le32(pb);
882 len = get_le32(pb);
883 #if defined(DEBUG_SEEK)
884 av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
885 i, tag, flags, pos, len);
886 #endif
887 if(i==0 && pos > avi->movi_list)
888 avi->movi_list= 0; //FIXME better check
889 pos += avi->movi_list;
890
891 index = ((tag & 0xff) - '0') * 10;
892 index += ((tag >> 8) & 0xff) - '0';
893 if (index >= s->nb_streams)
894 continue;
895 st = s->streams[index];
896 ast = st->priv_data;
897
898 #if defined(DEBUG_SEEK)
899 av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
900 #endif
901 if(last_pos == pos)
902 avi->non_interleaved= 1;
903 else
904 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
905 if(ast->sample_size)
906 ast->cum_len += len;
907 else
908 ast->cum_len ++;
909 last_pos= pos;
910 }
911 return 0;
912 }
913
914 static int guess_ni_flag(AVFormatContext *s){
915 int i;
916 int64_t last_start=0;
917 int64_t first_end= INT64_MAX;
918
919 for(i=0; i<s->nb_streams; i++){
920 AVStream *st = s->streams[i];
921 int n= st->nb_index_entries;
922
923 if(n <= 0)
924 continue;
925
926 if(st->index_entries[0].pos > last_start)
927 last_start= st->index_entries[0].pos;
928 if(st->index_entries[n-1].pos < first_end)
929 first_end= st->index_entries[n-1].pos;
930 }
931 return last_start > first_end;
932 }
933
934 static int avi_load_index(AVFormatContext *s)
935 {
936 AVIContext *avi = s->priv_data;
937 ByteIOContext *pb = s->pb;
938 uint32_t tag, size;
939 offset_t pos= url_ftell(pb);
940
941 url_fseek(pb, avi->movi_end, SEEK_SET);
942 #ifdef DEBUG_SEEK
943 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
944 #endif
945 for(;;) {
946 if (url_feof(pb))
947 break;
948 tag = get_le32(pb);
949 size = get_le32(pb);
950 #ifdef DEBUG_SEEK
951 printf("tag=%c%c%c%c size=0x%x\n",
952 tag & 0xff,
953 (tag >> 8) & 0xff,
954 (tag >> 16) & 0xff,
955 (tag >> 24) & 0xff,
956 size);
957 #endif
958 switch(tag) {
959 case MKTAG('i', 'd', 'x', '1'):
960 if (avi_read_idx1(s, size) < 0)
961 goto skip;
962 else
963 goto the_end;
964 break;
965 default:
966 skip:
967 size += (size & 1);
968 url_fskip(pb, size);
969 break;
970 }
971 }
972 the_end:
973 url_fseek(pb, pos, SEEK_SET);
974 return 0;
975 }
976
977 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
978 {
979 AVIContext *avi = s->priv_data;
980 AVStream *st;
981 int i, index;
982 int64_t pos;
983
984 if (!avi->index_loaded) {
985 /* we only load the index on demand */
986 avi_load_index(s);
987 avi->index_loaded = 1;
988 }
989 assert(stream_index>= 0);
990
991 st = s->streams[stream_index];
992 index= av_index_search_timestamp(st, timestamp, flags);
993 if(index<0)
994 return -1;
995
996 /* find the position */
997 pos = st->index_entries[index].pos;
998 timestamp = st->index_entries[index].timestamp;
999
1000 // av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1001
1002 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
1003 /* One and only one real stream for DV in AVI, and it has video */
1004 /* offsets. Calling with other stream indexes should have failed */
1005 /* the av_index_search_timestamp call above. */
1006 assert(stream_index == 0);
1007
1008 /* Feed the DV video stream version of the timestamp to the */
1009 /* DV demux so it can synth correct timestamps */
1010 dv_offset_reset(avi->dv_demux, timestamp);
1011
1012 url_fseek(s->pb, pos, SEEK_SET);
1013 avi->stream_index= -1;
1014 return 0;
1015 }
1016
1017 for(i = 0; i < s->nb_streams; i++) {
1018 AVStream *st2 = s->streams[i];
1019 AVIStream *ast2 = st2->priv_data;
1020
1021 ast2->packet_size=
1022 ast2->remaining= 0;
1023
1024 if (st2->nb_index_entries <= 0)
1025 continue;
1026
1027 // assert(st2->codec->block_align);
1028 assert(st2->time_base.den == ast2->rate);
1029 assert(st2->time_base.num == ast2->scale);
1030 index = av_index_search_timestamp(
1031 st2,
1032 av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
1033 flags | AVSEEK_FLAG_BACKWARD);
1034 if(index<0)
1035 index=0;
1036
1037 if(!avi->non_interleaved){
1038 while(index>0 && st2->index_entries[index].pos > pos)
1039 index--;
1040 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1041 index++;
1042 }
1043
1044 // av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1045 /* extract the current frame number */
1046 ast2->frame_offset = st2->index_entries[index].timestamp;
1047 if(ast2->sample_size)
1048 ast2->frame_offset *=ast2->sample_size;
1049 }
1050
1051 /* do the seek */
1052 url_fseek(s->pb, pos, SEEK_SET);
1053 avi->stream_index= -1;
1054 return 0;
1055 }
1056
1057 static int avi_read_close(AVFormatContext *s)
1058 {
1059 int i;
1060 AVIContext *avi = s->priv_data;
1061
1062 for(i=0;i<s->nb_streams;i++) {
1063 AVStream *st = s->streams[i];
1064 AVIStream *ast = st->priv_data;
1065 av_free(ast);
1066 av_free(st->codec->palctrl);
1067 }
1068
1069 if (avi->dv_demux)
1070 av_free(avi->dv_demux);
1071
1072 return 0;
1073 }
1074
1075 static int avi_probe(AVProbeData *p)
1076 {
1077 int i;
1078
1079 /* check file header */
1080 for(i=0; avi_headers[i][0]; i++)
1081 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1082 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1083 return AVPROBE_SCORE_MAX;
1084
1085 return 0;
1086 }
1087
1088 AVInputFormat avi_demuxer = {
1089 "avi",
1090 "avi format",
1091 sizeof(AVIContext),
1092 avi_probe,
1093 avi_read_header,
1094 avi_read_packet,
1095 avi_read_close,
1096 avi_read_seek,
1097 };