Fix memory leak introduced in r23933
[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 int odml_depth;
65 #define MAX_ODML_DEPTH 1000
66 } AVIContext;
67
68 static const char avi_headers[][8] = {
69 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
70 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
71 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
72 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
73 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
74 { 0 }
75 };
76
77 static int avi_load_index(AVFormatContext *s);
78 static int guess_ni_flag(AVFormatContext *s);
79
80 #ifdef DEBUG
81 static void print_tag(const char *str, unsigned int tag, int size)
82 {
83 dprintf(NULL, "%s: tag=%c%c%c%c size=0x%x\n",
84 str, tag & 0xff,
85 (tag >> 8) & 0xff,
86 (tag >> 16) & 0xff,
87 (tag >> 24) & 0xff,
88 size);
89 }
90 #endif
91
92 static inline int get_duration(AVIStream *ast, int len){
93 if(ast->sample_size){
94 return len;
95 }else
96 return 1;
97 }
98
99 static int get_riff(AVFormatContext *s, ByteIOContext *pb)
100 {
101 AVIContext *avi = s->priv_data;
102 char header[8];
103 int i;
104
105 /* check RIFF header */
106 get_buffer(pb, header, 4);
107 avi->riff_end = get_le32(pb); /* RIFF chunk size */
108 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
109 get_buffer(pb, header+4, 4);
110
111 for(i=0; avi_headers[i][0]; i++)
112 if(!memcmp(header, avi_headers[i], 8))
113 break;
114 if(!avi_headers[i][0])
115 return -1;
116
117 if(header[7] == 0x19)
118 av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
119
120 return 0;
121 }
122
123 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
124 AVIContext *avi = s->priv_data;
125 ByteIOContext *pb = s->pb;
126 int longs_pre_entry= get_le16(pb);
127 int index_sub_type = get_byte(pb);
128 int index_type = get_byte(pb);
129 int entries_in_use = get_le32(pb);
130 int chunk_id = get_le32(pb);
131 int64_t base = get_le64(pb);
132 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
133 AVStream *st;
134 AVIStream *ast;
135 int i;
136 int64_t last_pos= -1;
137 int64_t filesize= url_fsize(s->pb);
138
139 #ifdef DEBUG_SEEK
140 av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
141 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
142 #endif
143
144 if(stream_id >= s->nb_streams || stream_id < 0)
145 return -1;
146 st= s->streams[stream_id];
147 ast = st->priv_data;
148
149 if(index_sub_type)
150 return -1;
151
152 get_le32(pb);
153
154 if(index_type && longs_pre_entry != 2)
155 return -1;
156 if(index_type>1)
157 return -1;
158
159 if(filesize > 0 && base >= filesize){
160 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
161 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
162 base &= 0xFFFFFFFF;
163 else
164 return -1;
165 }
166
167 for(i=0; i<entries_in_use; i++){
168 if(index_type){
169 int64_t pos= get_le32(pb) + base - 8;
170 int len = get_le32(pb);
171 int key= len >= 0;
172 len &= 0x7FFFFFFF;
173
174 #ifdef DEBUG_SEEK
175 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
176 #endif
177 if(url_feof(pb))
178 return -1;
179
180 if(last_pos == pos || pos == base - 8)
181 avi->non_interleaved= 1;
182 if(last_pos != pos && (len || !ast->sample_size))
183 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
184
185 ast->cum_len += get_duration(ast, len);
186 last_pos= pos;
187 }else{
188 int64_t offset, pos;
189 int duration;
190 offset = get_le64(pb);
191 get_le32(pb); /* size */
192 duration = get_le32(pb);
193
194 if(url_feof(pb))
195 return -1;
196
197 pos = url_ftell(pb);
198
199 if(avi->odml_depth > MAX_ODML_DEPTH){
200 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
201 return -1;
202 }
203
204 url_fseek(pb, offset+8, SEEK_SET);
205 avi->odml_depth++;
206 read_braindead_odml_indx(s, frame_num);
207 avi->odml_depth--;
208 frame_num += duration;
209
210 url_fseek(pb, pos, SEEK_SET);
211 }
212 }
213 avi->index_loaded=1;
214 return 0;
215 }
216
217 static void clean_index(AVFormatContext *s){
218 int i;
219 int64_t j;
220
221 for(i=0; i<s->nb_streams; i++){
222 AVStream *st = s->streams[i];
223 AVIStream *ast = st->priv_data;
224 int n= st->nb_index_entries;
225 int max= ast->sample_size;
226 int64_t pos, size, ts;
227
228 if(n != 1 || ast->sample_size==0)
229 continue;
230
231 while(max < 1024) max+=max;
232
233 pos= st->index_entries[0].pos;
234 size= st->index_entries[0].size;
235 ts= st->index_entries[0].timestamp;
236
237 for(j=0; j<size; j+=max){
238 av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
239 }
240 }
241 }
242
243 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
244 {
245 ByteIOContext *pb = s->pb;
246 char key[5] = {0}, *value;
247
248 size += (size & 1);
249
250 if (size == UINT_MAX)
251 return -1;
252 value = av_malloc(size+1);
253 if (!value)
254 return -1;
255 get_buffer(pb, value, size);
256 value[size]=0;
257
258 AV_WL32(key, tag);
259
260 if(st)
261 return av_metadata_set2(&st->metadata, key, value,
262 AV_METADATA_DONT_STRDUP_VAL);
263 else
264 return av_metadata_set2(&s->metadata, key, value,
265 AV_METADATA_DONT_STRDUP_VAL);
266 }
267
268 static void avi_read_info(AVFormatContext *s, uint64_t end)
269 {
270 while (url_ftell(s->pb) < end) {
271 uint32_t tag = get_le32(s->pb);
272 uint32_t size = get_le32(s->pb);
273 avi_read_tag(s, NULL, tag, size);
274 }
275 }
276
277 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
278 {
279 AVIContext *avi = s->priv_data;
280 ByteIOContext *pb = s->pb;
281 unsigned int tag, tag1, handler;
282 int codec_type, stream_index, frame_period, bit_rate;
283 unsigned int size;
284 int i;
285 AVStream *st;
286 AVIStream *ast = NULL;
287 int avih_width=0, avih_height=0;
288 int amv_file_format=0;
289 uint64_t list_end = 0;
290
291 avi->stream_index= -1;
292
293 if (get_riff(s, pb) < 0)
294 return -1;
295
296 avi->fsize = url_fsize(pb);
297 if(avi->fsize<=0)
298 avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
299
300 /* first list tag */
301 stream_index = -1;
302 codec_type = -1;
303 frame_period = 0;
304 for(;;) {
305 if (url_feof(pb))
306 goto fail;
307 tag = get_le32(pb);
308 size = get_le32(pb);
309 #ifdef DEBUG
310 print_tag("tag", tag, size);
311 #endif
312
313 switch(tag) {
314 case MKTAG('L', 'I', 'S', 'T'):
315 list_end = url_ftell(pb) + size;
316 /* Ignored, except at start of video packets. */
317 tag1 = get_le32(pb);
318 #ifdef DEBUG
319 print_tag("list", tag1, 0);
320 #endif
321 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
322 avi->movi_list = url_ftell(pb) - 4;
323 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
324 else avi->movi_end = url_fsize(pb);
325 dprintf(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
326 goto end_of_header;
327 }
328 else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
329 avi_read_info(s, list_end);
330
331 break;
332 case MKTAG('d', 'm', 'l', 'h'):
333 avi->is_odml = 1;
334 url_fskip(pb, size + (size & 1));
335 break;
336 case MKTAG('a', 'm', 'v', 'h'):
337 amv_file_format=1;
338 case MKTAG('a', 'v', 'i', 'h'):
339 /* AVI header */
340 /* using frame_period is bad idea */
341 frame_period = get_le32(pb);
342 bit_rate = get_le32(pb) * 8;
343 get_le32(pb);
344 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
345
346 url_fskip(pb, 2 * 4);
347 get_le32(pb);
348 get_le32(pb);
349 avih_width=get_le32(pb);
350 avih_height=get_le32(pb);
351
352 url_fskip(pb, size - 10 * 4);
353 break;
354 case MKTAG('s', 't', 'r', 'h'):
355 /* stream header */
356
357 tag1 = get_le32(pb);
358 handler = get_le32(pb); /* codec tag */
359
360 if(tag1 == MKTAG('p', 'a', 'd', 's')){
361 url_fskip(pb, size - 8);
362 break;
363 }else{
364 stream_index++;
365 st = av_new_stream(s, stream_index);
366 if (!st)
367 goto fail;
368
369 ast = av_mallocz(sizeof(AVIStream));
370 if (!ast)
371 goto fail;
372 st->priv_data = ast;
373 }
374 if(amv_file_format)
375 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
376
377 #ifdef DEBUG
378 print_tag("strh", tag1, -1);
379 #endif
380 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
381 int64_t dv_dur;
382
383 /*
384 * After some consideration -- I don't think we
385 * have to support anything but DV in type1 AVIs.
386 */
387 if (s->nb_streams != 1)
388 goto fail;
389
390 if (handler != MKTAG('d', 'v', 's', 'd') &&
391 handler != MKTAG('d', 'v', 'h', 'd') &&
392 handler != MKTAG('d', 'v', 's', 'l'))
393 goto fail;
394
395 ast = s->streams[0]->priv_data;
396 av_freep(&s->streams[0]->codec->extradata);
397 av_freep(&s->streams[0]);
398 s->nb_streams = 0;
399 if (CONFIG_DV_DEMUXER) {
400 avi->dv_demux = dv_init_demux(s);
401 if (!avi->dv_demux)
402 goto fail;
403 }
404 s->streams[0]->priv_data = ast;
405 url_fskip(pb, 3 * 4);
406 ast->scale = get_le32(pb);
407 ast->rate = get_le32(pb);
408 url_fskip(pb, 4); /* start time */
409
410 dv_dur = get_le32(pb);
411 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
412 dv_dur *= AV_TIME_BASE;
413 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
414 }
415 /*
416 * else, leave duration alone; timing estimation in utils.c
417 * will make a guess based on bitrate.
418 */
419
420 stream_index = s->nb_streams - 1;
421 url_fskip(pb, size - 9*4);
422 break;
423 }
424
425 assert(stream_index < s->nb_streams);
426 st->codec->stream_codec_tag= handler;
427
428 get_le32(pb); /* flags */
429 get_le16(pb); /* priority */
430 get_le16(pb); /* language */
431 get_le32(pb); /* initial frame */
432 ast->scale = get_le32(pb);
433 ast->rate = get_le32(pb);
434 if(!(ast->scale && ast->rate)){
435 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);
436 if(frame_period){
437 ast->rate = 1000000;
438 ast->scale = frame_period;
439 }else{
440 ast->rate = 25;
441 ast->scale = 1;
442 }
443 }
444 av_set_pts_info(st, 64, ast->scale, ast->rate);
445
446 ast->cum_len=get_le32(pb); /* start */
447 st->nb_frames = get_le32(pb);
448
449 st->start_time = 0;
450 get_le32(pb); /* buffer size */
451 get_le32(pb); /* quality */
452 ast->sample_size = get_le32(pb); /* sample ssize */
453 ast->cum_len *= FFMAX(1, ast->sample_size);
454 // av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
455
456 switch(tag1) {
457 case MKTAG('v', 'i', 'd', 's'):
458 codec_type = AVMEDIA_TYPE_VIDEO;
459
460 ast->sample_size = 0;
461 break;
462 case MKTAG('a', 'u', 'd', 's'):
463 codec_type = AVMEDIA_TYPE_AUDIO;
464 break;
465 case MKTAG('t', 'x', 't', 's'):
466 //FIXME
467 codec_type = AVMEDIA_TYPE_DATA; //AVMEDIA_TYPE_SUB ? FIXME
468 break;
469 case MKTAG('d', 'a', 't', 's'):
470 codec_type = AVMEDIA_TYPE_DATA;
471 break;
472 default:
473 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
474 goto fail;
475 }
476 if(ast->sample_size == 0)
477 st->duration = st->nb_frames;
478 ast->frame_offset= ast->cum_len;
479 url_fskip(pb, size - 12 * 4);
480 break;
481 case MKTAG('s', 't', 'r', 'f'):
482 /* stream header */
483 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
484 url_fskip(pb, size);
485 } else {
486 uint64_t cur_pos = url_ftell(pb);
487 if (cur_pos < list_end)
488 size = FFMIN(size, list_end - cur_pos);
489 st = s->streams[stream_index];
490 switch(codec_type) {
491 case AVMEDIA_TYPE_VIDEO:
492 if(amv_file_format){
493 st->codec->width=avih_width;
494 st->codec->height=avih_height;
495 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
496 st->codec->codec_id = CODEC_ID_AMV;
497 url_fskip(pb, size);
498 break;
499 }
500 get_le32(pb); /* size */
501 st->codec->width = get_le32(pb);
502 st->codec->height = (int32_t)get_le32(pb);
503 get_le16(pb); /* panes */
504 st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
505 tag1 = get_le32(pb);
506 get_le32(pb); /* ImageSize */
507 get_le32(pb); /* XPelsPerMeter */
508 get_le32(pb); /* YPelsPerMeter */
509 get_le32(pb); /* ClrUsed */
510 get_le32(pb); /* ClrImportant */
511
512 if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
513 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
514 st->codec->codec_tag = tag1;
515 st->codec->codec_id = CODEC_ID_XSUB;
516 break;
517 }
518
519 if(size > 10*4 && size<(1<<30)){
520 st->codec->extradata_size= size - 10*4;
521 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
522 if (!st->codec->extradata) {
523 st->codec->extradata_size= 0;
524 return AVERROR(ENOMEM);
525 }
526 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
527 }
528
529 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
530 get_byte(pb);
531
532 /* Extract palette from extradata if bpp <= 8. */
533 /* This code assumes that extradata contains only palette. */
534 /* This is true for all paletted codecs implemented in FFmpeg. */
535 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
536 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
537 #if HAVE_BIGENDIAN
538 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
539 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
540 #else
541 memcpy(st->codec->palctrl->palette, st->codec->extradata,
542 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
543 #endif
544 st->codec->palctrl->palette_changed = 1;
545 }
546
547 #ifdef DEBUG
548 print_tag("video", tag1, 0);
549 #endif
550 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
551 st->codec->codec_tag = tag1;
552 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
553 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
554 // Support "Resolution 1:1" for Avid AVI Codec
555 if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
556 st->codec->extradata_size >= 31 &&
557 !memcmp(&st->codec->extradata[28], "1:1", 3))
558 st->codec->codec_id = CODEC_ID_RAWVIDEO;
559
560 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
561 st->codec->extradata_size+= 9;
562 st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
563 if(st->codec->extradata)
564 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
565 }
566 st->codec->height= FFABS(st->codec->height);
567
568 // url_fskip(pb, size - 5 * 4);
569 break;
570 case AVMEDIA_TYPE_AUDIO:
571 ff_get_wav_header(pb, st->codec, size);
572 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
573 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
574 ast->sample_size= st->codec->block_align;
575 }
576 if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
577 url_fskip(pb, 1);
578 /* Force parsing as several audio frames can be in
579 * one packet and timestamps refer to packet start. */
580 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
581 /* ADTS header is in extradata, AAC without header must be
582 * stored as exact frames. Parser not needed and it will
583 * fail. */
584 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
585 st->need_parsing = AVSTREAM_PARSE_NONE;
586 /* AVI files with Xan DPCM audio (wrongly) declare PCM
587 * audio in the header but have Axan as stream_code_tag. */
588 if (st->codec->stream_codec_tag == AV_RL32("Axan")){
589 st->codec->codec_id = CODEC_ID_XAN_DPCM;
590 st->codec->codec_tag = 0;
591 }
592 if (amv_file_format)
593 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
594 break;
595 default:
596 st->codec->codec_type = AVMEDIA_TYPE_DATA;
597 st->codec->codec_id= CODEC_ID_NONE;
598 st->codec->codec_tag= 0;
599 url_fskip(pb, size);
600 break;
601 }
602 }
603 break;
604 case MKTAG('i', 'n', 'd', 'x'):
605 i= url_ftell(pb);
606 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
607 read_braindead_odml_indx(s, 0);
608 }
609 url_fseek(pb, i+size, SEEK_SET);
610 break;
611 case MKTAG('v', 'p', 'r', 'p'):
612 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
613 AVRational active, active_aspect;
614
615 st = s->streams[stream_index];
616 get_le32(pb);
617 get_le32(pb);
618 get_le32(pb);
619 get_le32(pb);
620 get_le32(pb);
621
622 active_aspect.den= get_le16(pb);
623 active_aspect.num= get_le16(pb);
624 active.num = get_le32(pb);
625 active.den = get_le32(pb);
626 get_le32(pb); //nbFieldsPerFrame
627
628 if(active_aspect.num && active_aspect.den && active.num && active.den){
629 st->sample_aspect_ratio= av_div_q(active_aspect, active);
630 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
631 }
632 size -= 9*4;
633 }
634 url_fseek(pb, size, SEEK_CUR);
635 break;
636 case MKTAG('s', 't', 'r', 'n'):
637 if(s->nb_streams){
638 avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
639 break;
640 }
641 default:
642 if(size > 1000000){
643 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
644 "I will ignore it and try to continue anyway.\n");
645 avi->movi_list = url_ftell(pb) - 4;
646 avi->movi_end = url_fsize(pb);
647 goto end_of_header;
648 }
649 /* skip tag */
650 size += (size & 1);
651 url_fskip(pb, size);
652 break;
653 }
654 }
655 end_of_header:
656 /* check stream number */
657 if (stream_index != s->nb_streams - 1) {
658 fail:
659 return -1;
660 }
661
662 if(!avi->index_loaded && !url_is_streamed(pb))
663 avi_load_index(s);
664 avi->index_loaded = 1;
665 avi->non_interleaved |= guess_ni_flag(s);
666 for(i=0; i<s->nb_streams; i++){
667 AVStream *st = s->streams[i];
668 if(st->nb_index_entries)
669 break;
670 }
671 if(i==s->nb_streams && avi->non_interleaved) {
672 av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
673 avi->non_interleaved=0;
674 }
675
676 if(avi->non_interleaved) {
677 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
678 clean_index(s);
679 }
680
681 return 0;
682 }
683
684 static int get_stream_idx(int *d){
685 if( d[0] >= '0' && d[0] <= '9'
686 && d[1] >= '0' && d[1] <= '9'){
687 return (d[0] - '0') * 10 + (d[1] - '0');
688 }else{
689 return 100; //invalid stream ID
690 }
691 }
692
693 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
694 {
695 AVIContext *avi = s->priv_data;
696 ByteIOContext *pb = s->pb;
697 int n, d[8];
698 unsigned int size;
699 int64_t i, sync;
700 void* dstr;
701
702 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
703 int size = dv_get_packet(avi->dv_demux, pkt);
704 if (size >= 0)
705 return size;
706 }
707
708 if(avi->non_interleaved){
709 int best_stream_index = 0;
710 AVStream *best_st= NULL;
711 AVIStream *best_ast;
712 int64_t best_ts= INT64_MAX;
713 int i;
714
715 for(i=0; i<s->nb_streams; i++){
716 AVStream *st = s->streams[i];
717 AVIStream *ast = st->priv_data;
718 int64_t ts= ast->frame_offset;
719 int64_t last_ts;
720
721 if(!st->nb_index_entries)
722 continue;
723
724 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
725 if(!ast->remaining && ts > last_ts)
726 continue;
727
728 ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
729
730 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
731 if(ts < best_ts){
732 best_ts= ts;
733 best_st= st;
734 best_stream_index= i;
735 }
736 }
737 if(!best_st)
738 return -1;
739
740 best_ast = best_st->priv_data;
741 best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
742 if(best_ast->remaining)
743 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
744 else{
745 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
746 if(i>=0)
747 best_ast->frame_offset= best_st->index_entries[i].timestamp;
748 }
749
750 // av_log(s, AV_LOG_DEBUG, "%d\n", i);
751 if(i>=0){
752 int64_t pos= best_st->index_entries[i].pos;
753 pos += best_ast->packet_size - best_ast->remaining;
754 url_fseek(s->pb, pos + 8, SEEK_SET);
755 // av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
756
757 assert(best_ast->remaining <= best_ast->packet_size);
758
759 avi->stream_index= best_stream_index;
760 if(!best_ast->remaining)
761 best_ast->packet_size=
762 best_ast->remaining= best_st->index_entries[i].size;
763 }
764 }
765
766 resync:
767 if(avi->stream_index >= 0){
768 AVStream *st= s->streams[ avi->stream_index ];
769 AVIStream *ast= st->priv_data;
770 int size, err;
771
772 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
773 size= INT_MAX;
774 else if(ast->sample_size < 32)
775 // arbitrary multiplier to avoid tiny packets for raw PCM data
776 size= 1024*ast->sample_size;
777 else
778 size= ast->sample_size;
779
780 if(size > ast->remaining)
781 size= ast->remaining;
782 avi->last_pkt_pos= url_ftell(pb);
783 err= av_get_packet(pb, pkt, size);
784 if(err<0)
785 return err;
786
787 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
788 void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
789 if(ptr){
790 ast->has_pal=0;
791 pkt->size += 4*256;
792 pkt->data= ptr;
793 memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
794 }else
795 av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
796 }
797
798 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
799 dstr = pkt->destruct;
800 size = dv_produce_packet(avi->dv_demux, pkt,
801 pkt->data, pkt->size);
802 pkt->destruct = dstr;
803 pkt->flags |= AV_PKT_FLAG_KEY;
804 } else {
805 /* XXX: How to handle B-frames in AVI? */
806 pkt->dts = ast->frame_offset;
807 // pkt->dts += ast->start;
808 if(ast->sample_size)
809 pkt->dts /= ast->sample_size;
810 //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);
811 pkt->stream_index = avi->stream_index;
812
813 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
814 AVIndexEntry *e;
815 int index;
816 assert(st->index_entries);
817
818 index= av_index_search_timestamp(st, ast->frame_offset, 0);
819 e= &st->index_entries[index];
820
821 if(index >= 0 && e->timestamp == ast->frame_offset){
822 if (e->flags & AVINDEX_KEYFRAME)
823 pkt->flags |= AV_PKT_FLAG_KEY;
824 }
825 } else {
826 pkt->flags |= AV_PKT_FLAG_KEY;
827 }
828 ast->frame_offset += get_duration(ast, pkt->size);
829 }
830 ast->remaining -= size;
831 if(!ast->remaining){
832 avi->stream_index= -1;
833 ast->packet_size= 0;
834 }
835
836 return size;
837 }
838
839 memset(d, -1, sizeof(int)*8);
840 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
841 int j;
842
843 for(j=0; j<7; j++)
844 d[j]= d[j+1];
845 d[7]= get_byte(pb);
846
847 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
848
849 n= get_stream_idx(d+2);
850 //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);
851 if(i + (uint64_t)size > avi->fsize || d[0]<0)
852 continue;
853
854 //parse ix##
855 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
856 //parse JUNK
857 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
858 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
859 url_fskip(pb, size);
860 //av_log(s, AV_LOG_DEBUG, "SKIP\n");
861 goto resync;
862 }
863
864 //parse stray LIST
865 if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
866 url_fskip(pb, 4);
867 goto resync;
868 }
869
870 n= get_stream_idx(d);
871
872 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
873 continue;
874
875 //detect ##ix chunk and skip
876 if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
877 url_fskip(pb, size);
878 goto resync;
879 }
880
881 //parse ##dc/##wb
882 if(n < s->nb_streams){
883 AVStream *st;
884 AVIStream *ast;
885 st = s->streams[n];
886 ast = st->priv_data;
887
888 if(s->nb_streams>=2){
889 AVStream *st1 = s->streams[1];
890 AVIStream *ast1= st1->priv_data;
891 //workaround for broken small-file-bug402.avi
892 if( d[2] == 'w' && d[3] == 'b'
893 && n==0
894 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
895 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
896 && ast->prefix == 'd'*256+'c'
897 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
898 ){
899 n=1;
900 st = st1;
901 ast = ast1;
902 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
903 }
904 }
905
906
907 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
908 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
909 || st->discard >= AVDISCARD_ALL){
910 ast->frame_offset += get_duration(ast, size);
911 url_fskip(pb, size);
912 goto resync;
913 }
914
915 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
916 int k = get_byte(pb);
917 int last = (k + get_byte(pb) - 1) & 0xFF;
918
919 get_le16(pb); //flags
920
921 for (; k <= last; k++)
922 ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
923 ast->has_pal= 1;
924 goto resync;
925 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
926 d[2]*256+d[3] == ast->prefix /*||
927 (d[2] == 'd' && d[3] == 'c') ||
928 (d[2] == 'w' && d[3] == 'b')*/) {
929
930 //av_log(s, AV_LOG_DEBUG, "OK\n");
931 if(d[2]*256+d[3] == ast->prefix)
932 ast->prefix_count++;
933 else{
934 ast->prefix= d[2]*256+d[3];
935 ast->prefix_count= 0;
936 }
937
938 avi->stream_index= n;
939 ast->packet_size= size + 8;
940 ast->remaining= size;
941
942 if(size || !ast->sample_size){
943 uint64_t pos= url_ftell(pb) - 8;
944 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
945 av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
946 }
947 }
948 goto resync;
949 }
950 }
951 }
952
953 return AVERROR_EOF;
954 }
955
956 /* XXX: We make the implicit supposition that the positions are sorted
957 for each stream. */
958 static int avi_read_idx1(AVFormatContext *s, int size)
959 {
960 AVIContext *avi = s->priv_data;
961 ByteIOContext *pb = s->pb;
962 int nb_index_entries, i;
963 AVStream *st;
964 AVIStream *ast;
965 unsigned int index, tag, flags, pos, len;
966 unsigned last_pos= -1;
967
968 nb_index_entries = size / 16;
969 if (nb_index_entries <= 0)
970 return -1;
971
972 /* Read the entries and sort them in each stream component. */
973 for(i = 0; i < nb_index_entries; i++) {
974 tag = get_le32(pb);
975 flags = get_le32(pb);
976 pos = get_le32(pb);
977 len = get_le32(pb);
978 #if defined(DEBUG_SEEK)
979 av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
980 i, tag, flags, pos, len);
981 #endif
982 if(i==0 && pos > avi->movi_list)
983 avi->movi_list= 0; //FIXME better check
984 pos += avi->movi_list;
985
986 index = ((tag & 0xff) - '0') * 10;
987 index += ((tag >> 8) & 0xff) - '0';
988 if (index >= s->nb_streams)
989 continue;
990 st = s->streams[index];
991 ast = st->priv_data;
992
993 #if defined(DEBUG_SEEK)
994 av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
995 #endif
996 if(url_feof(pb))
997 return -1;
998
999 if(last_pos == pos)
1000 avi->non_interleaved= 1;
1001 else if(len || !ast->sample_size)
1002 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1003 ast->cum_len += get_duration(ast, len);
1004 last_pos= pos;
1005 }
1006 return 0;
1007 }
1008
1009 static int guess_ni_flag(AVFormatContext *s){
1010 int i;
1011 int64_t last_start=0;
1012 int64_t first_end= INT64_MAX;
1013 int64_t oldpos= url_ftell(s->pb);
1014
1015 for(i=0; i<s->nb_streams; i++){
1016 AVStream *st = s->streams[i];
1017 int n= st->nb_index_entries;
1018 unsigned int size;
1019
1020 if(n <= 0)
1021 continue;
1022
1023 if(n >= 2){
1024 int64_t pos= st->index_entries[0].pos;
1025 url_fseek(s->pb, pos + 4, SEEK_SET);
1026 size= get_le32(s->pb);
1027 if(pos + size > st->index_entries[1].pos)
1028 last_start= INT64_MAX;
1029 }
1030
1031 if(st->index_entries[0].pos > last_start)
1032 last_start= st->index_entries[0].pos;
1033 if(st->index_entries[n-1].pos < first_end)
1034 first_end= st->index_entries[n-1].pos;
1035 }
1036 url_fseek(s->pb, oldpos, SEEK_SET);
1037 return last_start > first_end;
1038 }
1039
1040 static int avi_load_index(AVFormatContext *s)
1041 {
1042 AVIContext *avi = s->priv_data;
1043 ByteIOContext *pb = s->pb;
1044 uint32_t tag, size;
1045 int64_t pos= url_ftell(pb);
1046 int ret = -1;
1047
1048 if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0)
1049 goto the_end; // maybe truncated file
1050 #ifdef DEBUG_SEEK
1051 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1052 #endif
1053 for(;;) {
1054 if (url_feof(pb))
1055 break;
1056 tag = get_le32(pb);
1057 size = get_le32(pb);
1058 #ifdef DEBUG_SEEK
1059 printf("tag=%c%c%c%c size=0x%x\n",
1060 tag & 0xff,
1061 (tag >> 8) & 0xff,
1062 (tag >> 16) & 0xff,
1063 (tag >> 24) & 0xff,
1064 size);
1065 #endif
1066 switch(tag) {
1067 case MKTAG('i', 'd', 'x', '1'):
1068 if (avi_read_idx1(s, size) < 0)
1069 goto skip;
1070 ret = 0;
1071 goto the_end;
1072 break;
1073 default:
1074 skip:
1075 size += (size & 1);
1076 if (url_fseek(pb, size, SEEK_CUR) < 0)
1077 goto the_end; // something is wrong here
1078 break;
1079 }
1080 }
1081 the_end:
1082 url_fseek(pb, pos, SEEK_SET);
1083 return ret;
1084 }
1085
1086 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1087 {
1088 AVIContext *avi = s->priv_data;
1089 AVStream *st;
1090 int i, index;
1091 int64_t pos;
1092 AVIStream *ast;
1093
1094 if (!avi->index_loaded) {
1095 /* we only load the index on demand */
1096 avi_load_index(s);
1097 avi->index_loaded = 1;
1098 }
1099 assert(stream_index>= 0);
1100
1101 st = s->streams[stream_index];
1102 ast= st->priv_data;
1103 index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1104 if(index<0)
1105 return -1;
1106
1107 /* find the position */
1108 pos = st->index_entries[index].pos;
1109 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1110
1111 // av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1112
1113 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1114 /* One and only one real stream for DV in AVI, and it has video */
1115 /* offsets. Calling with other stream indexes should have failed */
1116 /* the av_index_search_timestamp call above. */
1117 assert(stream_index == 0);
1118
1119 /* Feed the DV video stream version of the timestamp to the */
1120 /* DV demux so it can synthesize correct timestamps. */
1121 dv_offset_reset(avi->dv_demux, timestamp);
1122
1123 url_fseek(s->pb, pos, SEEK_SET);
1124 avi->stream_index= -1;
1125 return 0;
1126 }
1127
1128 for(i = 0; i < s->nb_streams; i++) {
1129 AVStream *st2 = s->streams[i];
1130 AVIStream *ast2 = st2->priv_data;
1131
1132 ast2->packet_size=
1133 ast2->remaining= 0;
1134
1135 if (st2->nb_index_entries <= 0)
1136 continue;
1137
1138 // assert(st2->codec->block_align);
1139 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1140 index = av_index_search_timestamp(
1141 st2,
1142 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1143 flags | AVSEEK_FLAG_BACKWARD);
1144 if(index<0)
1145 index=0;
1146
1147 if(!avi->non_interleaved){
1148 while(index>0 && st2->index_entries[index].pos > pos)
1149 index--;
1150 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1151 index++;
1152 }
1153
1154 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1155 /* extract the current frame number */
1156 ast2->frame_offset = st2->index_entries[index].timestamp;
1157 }
1158
1159 /* do the seek */
1160 url_fseek(s->pb, pos, SEEK_SET);
1161 avi->stream_index= -1;
1162 return 0;
1163 }
1164
1165 static int avi_read_close(AVFormatContext *s)
1166 {
1167 int i;
1168 AVIContext *avi = s->priv_data;
1169
1170 for(i=0;i<s->nb_streams;i++) {
1171 AVStream *st = s->streams[i];
1172 av_free(st->codec->palctrl);
1173 }
1174
1175 if (avi->dv_demux)
1176 av_free(avi->dv_demux);
1177
1178 return 0;
1179 }
1180
1181 static int avi_probe(AVProbeData *p)
1182 {
1183 int i;
1184
1185 /* check file header */
1186 for(i=0; avi_headers[i][0]; i++)
1187 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1188 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1189 return AVPROBE_SCORE_MAX;
1190
1191 return 0;
1192 }
1193
1194 AVInputFormat avi_demuxer = {
1195 "avi",
1196 NULL_IF_CONFIG_SMALL("AVI format"),
1197 sizeof(AVIContext),
1198 avi_probe,
1199 avi_read_header,
1200 avi_read_packet,
1201 avi_read_close,
1202 avi_read_seek,
1203 .metadata_conv = ff_avi_metadata_conv,
1204 };