Duplicate rounding that MS does in one of their implementations of an avi demuxer.
[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 int block_align; ///< AVCodecContext.block_align copied here for easier access
52 } AVIStream;
53
54 typedef struct {
55 int64_t riff_end;
56 int64_t movi_end;
57 int64_t fsize;
58 int64_t movi_list;
59 int64_t last_pkt_pos;
60 int index_loaded;
61 int is_odml;
62 int non_interleaved;
63 int stream_index;
64 DVDemuxContext* dv_demux;
65 int odml_depth;
66 #define MAX_ODML_DEPTH 1000
67 } AVIContext;
68
69 static const char avi_headers[][8] = {
70 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
71 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
72 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
73 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
74 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
75 { 0 }
76 };
77
78 static int avi_load_index(AVFormatContext *s);
79 static int guess_ni_flag(AVFormatContext *s);
80
81 #ifdef DEBUG
82 static void print_tag(const char *str, unsigned int tag, int size)
83 {
84 dprintf(NULL, "%s: tag=%c%c%c%c size=0x%x\n",
85 str, tag & 0xff,
86 (tag >> 8) & 0xff,
87 (tag >> 16) & 0xff,
88 (tag >> 24) & 0xff,
89 size);
90 }
91 #endif
92
93 static inline int get_duration(AVIStream *ast, int len){
94 if(ast->sample_size){
95 return len;
96 }else if (ast->block_align){
97 return (len + ast->block_align - 1)/ast->block_align;
98 }else
99 return 1;
100 }
101
102 static int get_riff(AVFormatContext *s, ByteIOContext *pb)
103 {
104 AVIContext *avi = s->priv_data;
105 char header[8];
106 int i;
107
108 /* check RIFF header */
109 get_buffer(pb, header, 4);
110 avi->riff_end = get_le32(pb); /* RIFF chunk size */
111 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
112 get_buffer(pb, header+4, 4);
113
114 for(i=0; avi_headers[i][0]; i++)
115 if(!memcmp(header, avi_headers[i], 8))
116 break;
117 if(!avi_headers[i][0])
118 return -1;
119
120 if(header[7] == 0x19)
121 av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
122
123 return 0;
124 }
125
126 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
127 AVIContext *avi = s->priv_data;
128 ByteIOContext *pb = s->pb;
129 int longs_pre_entry= get_le16(pb);
130 int index_sub_type = get_byte(pb);
131 int index_type = get_byte(pb);
132 int entries_in_use = get_le32(pb);
133 int chunk_id = get_le32(pb);
134 int64_t base = get_le64(pb);
135 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
136 AVStream *st;
137 AVIStream *ast;
138 int i;
139 int64_t last_pos= -1;
140 int64_t filesize= url_fsize(s->pb);
141
142 #ifdef DEBUG_SEEK
143 av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
144 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
145 #endif
146
147 if(stream_id >= s->nb_streams || stream_id < 0)
148 return -1;
149 st= s->streams[stream_id];
150 ast = st->priv_data;
151
152 if(index_sub_type)
153 return -1;
154
155 get_le32(pb);
156
157 if(index_type && longs_pre_entry != 2)
158 return -1;
159 if(index_type>1)
160 return -1;
161
162 if(filesize > 0 && base >= filesize){
163 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
164 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
165 base &= 0xFFFFFFFF;
166 else
167 return -1;
168 }
169
170 for(i=0; i<entries_in_use; i++){
171 if(index_type){
172 int64_t pos= get_le32(pb) + base - 8;
173 int len = get_le32(pb);
174 int key= len >= 0;
175 len &= 0x7FFFFFFF;
176
177 #ifdef DEBUG_SEEK
178 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
179 #endif
180 if(url_feof(pb))
181 return -1;
182
183 if(last_pos == pos || pos == base - 8)
184 avi->non_interleaved= 1;
185 if(last_pos != pos && (len || !ast->sample_size))
186 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
187
188 ast->cum_len += get_duration(ast, len);
189 last_pos= pos;
190 }else{
191 int64_t offset, pos;
192 int duration;
193 offset = get_le64(pb);
194 get_le32(pb); /* size */
195 duration = get_le32(pb);
196
197 if(url_feof(pb))
198 return -1;
199
200 pos = url_ftell(pb);
201
202 if(avi->odml_depth > MAX_ODML_DEPTH){
203 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
204 return -1;
205 }
206
207 url_fseek(pb, offset+8, SEEK_SET);
208 avi->odml_depth++;
209 read_braindead_odml_indx(s, frame_num);
210 avi->odml_depth--;
211 frame_num += duration;
212
213 url_fseek(pb, pos, SEEK_SET);
214 }
215 }
216 avi->index_loaded=1;
217 return 0;
218 }
219
220 static void clean_index(AVFormatContext *s){
221 int i;
222 int64_t j;
223
224 for(i=0; i<s->nb_streams; i++){
225 AVStream *st = s->streams[i];
226 AVIStream *ast = st->priv_data;
227 int n= st->nb_index_entries;
228 int max= ast->sample_size;
229 int64_t pos, size, ts;
230
231 if(n != 1 || ast->sample_size==0)
232 continue;
233
234 while(max < 1024) max+=max;
235
236 pos= st->index_entries[0].pos;
237 size= st->index_entries[0].size;
238 ts= st->index_entries[0].timestamp;
239
240 for(j=0; j<size; j+=max){
241 av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
242 }
243 }
244 }
245
246 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
247 {
248 ByteIOContext *pb = s->pb;
249 char key[5] = {0}, *value;
250
251 size += (size & 1);
252
253 if (size == UINT_MAX)
254 return -1;
255 value = av_malloc(size+1);
256 if (!value)
257 return -1;
258 get_buffer(pb, value, size);
259 value[size]=0;
260
261 AV_WL32(key, tag);
262
263 if(st)
264 return av_metadata_set2(&st->metadata, key, value,
265 AV_METADATA_DONT_STRDUP_VAL);
266 else
267 return av_metadata_set2(&s->metadata, key, value,
268 AV_METADATA_DONT_STRDUP_VAL);
269 }
270
271 static void avi_read_info(AVFormatContext *s, uint64_t end)
272 {
273 while (url_ftell(s->pb) < end) {
274 uint32_t tag = get_le32(s->pb);
275 uint32_t size = get_le32(s->pb);
276 avi_read_tag(s, NULL, tag, size);
277 }
278 }
279
280 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
281 {
282 AVIContext *avi = s->priv_data;
283 ByteIOContext *pb = s->pb;
284 unsigned int tag, tag1, handler;
285 int codec_type, stream_index, frame_period, bit_rate;
286 unsigned int size;
287 int i;
288 AVStream *st;
289 AVIStream *ast = NULL;
290 int avih_width=0, avih_height=0;
291 int amv_file_format=0;
292 uint64_t list_end = 0;
293
294 avi->stream_index= -1;
295
296 if (get_riff(s, pb) < 0)
297 return -1;
298
299 avi->fsize = url_fsize(pb);
300 if(avi->fsize<=0)
301 avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
302
303 /* first list tag */
304 stream_index = -1;
305 codec_type = -1;
306 frame_period = 0;
307 for(;;) {
308 if (url_feof(pb))
309 goto fail;
310 tag = get_le32(pb);
311 size = get_le32(pb);
312 #ifdef DEBUG
313 print_tag("tag", tag, size);
314 #endif
315
316 switch(tag) {
317 case MKTAG('L', 'I', 'S', 'T'):
318 list_end = url_ftell(pb) + size;
319 /* Ignored, except at start of video packets. */
320 tag1 = get_le32(pb);
321 #ifdef DEBUG
322 print_tag("list", tag1, 0);
323 #endif
324 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
325 avi->movi_list = url_ftell(pb) - 4;
326 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
327 else avi->movi_end = url_fsize(pb);
328 dprintf(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
329 goto end_of_header;
330 }
331 else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
332 avi_read_info(s, list_end);
333
334 break;
335 case MKTAG('d', 'm', 'l', 'h'):
336 avi->is_odml = 1;
337 url_fskip(pb, size + (size & 1));
338 break;
339 case MKTAG('a', 'm', 'v', 'h'):
340 amv_file_format=1;
341 case MKTAG('a', 'v', 'i', 'h'):
342 /* AVI header */
343 /* using frame_period is bad idea */
344 frame_period = get_le32(pb);
345 bit_rate = get_le32(pb) * 8;
346 get_le32(pb);
347 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
348
349 url_fskip(pb, 2 * 4);
350 get_le32(pb);
351 get_le32(pb);
352 avih_width=get_le32(pb);
353 avih_height=get_le32(pb);
354
355 url_fskip(pb, size - 10 * 4);
356 break;
357 case MKTAG('s', 't', 'r', 'h'):
358 /* stream header */
359
360 tag1 = get_le32(pb);
361 handler = get_le32(pb); /* codec tag */
362
363 if(tag1 == MKTAG('p', 'a', 'd', 's')){
364 url_fskip(pb, size - 8);
365 break;
366 }else{
367 stream_index++;
368 st = av_new_stream(s, stream_index);
369 if (!st)
370 goto fail;
371
372 ast = av_mallocz(sizeof(AVIStream));
373 if (!ast)
374 goto fail;
375 st->priv_data = ast;
376 }
377 if(amv_file_format)
378 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
379
380 #ifdef DEBUG
381 print_tag("strh", tag1, -1);
382 #endif
383 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
384 int64_t dv_dur;
385
386 /*
387 * After some consideration -- I don't think we
388 * have to support anything but DV in type1 AVIs.
389 */
390 if (s->nb_streams != 1)
391 goto fail;
392
393 if (handler != MKTAG('d', 'v', 's', 'd') &&
394 handler != MKTAG('d', 'v', 'h', 'd') &&
395 handler != MKTAG('d', 'v', 's', 'l'))
396 goto fail;
397
398 ast = s->streams[0]->priv_data;
399 av_freep(&s->streams[0]->codec->extradata);
400 av_freep(&s->streams[0]);
401 s->nb_streams = 0;
402 if (CONFIG_DV_DEMUXER) {
403 avi->dv_demux = dv_init_demux(s);
404 if (!avi->dv_demux)
405 goto fail;
406 }
407 s->streams[0]->priv_data = ast;
408 url_fskip(pb, 3 * 4);
409 ast->scale = get_le32(pb);
410 ast->rate = get_le32(pb);
411 url_fskip(pb, 4); /* start time */
412
413 dv_dur = get_le32(pb);
414 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
415 dv_dur *= AV_TIME_BASE;
416 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
417 }
418 /*
419 * else, leave duration alone; timing estimation in utils.c
420 * will make a guess based on bitrate.
421 */
422
423 stream_index = s->nb_streams - 1;
424 url_fskip(pb, size - 9*4);
425 break;
426 }
427
428 assert(stream_index < s->nb_streams);
429 st->codec->stream_codec_tag= handler;
430
431 get_le32(pb); /* flags */
432 get_le16(pb); /* priority */
433 get_le16(pb); /* language */
434 get_le32(pb); /* initial frame */
435 ast->scale = get_le32(pb);
436 ast->rate = get_le32(pb);
437 if(!(ast->scale && ast->rate)){
438 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);
439 if(frame_period){
440 ast->rate = 1000000;
441 ast->scale = frame_period;
442 }else{
443 ast->rate = 25;
444 ast->scale = 1;
445 }
446 }
447 av_set_pts_info(st, 64, ast->scale, ast->rate);
448
449 ast->cum_len=get_le32(pb); /* start */
450 st->nb_frames = get_le32(pb);
451
452 st->start_time = 0;
453 get_le32(pb); /* buffer size */
454 get_le32(pb); /* quality */
455 ast->sample_size = get_le32(pb); /* sample ssize */
456 ast->cum_len *= FFMAX(1, ast->sample_size);
457 // av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
458
459 switch(tag1) {
460 case MKTAG('v', 'i', 'd', 's'):
461 codec_type = AVMEDIA_TYPE_VIDEO;
462
463 ast->sample_size = 0;
464 break;
465 case MKTAG('a', 'u', 'd', 's'):
466 codec_type = AVMEDIA_TYPE_AUDIO;
467 break;
468 case MKTAG('t', 'x', 't', 's'):
469 //FIXME
470 codec_type = AVMEDIA_TYPE_DATA; //AVMEDIA_TYPE_SUB ? FIXME
471 break;
472 case MKTAG('d', 'a', 't', 's'):
473 codec_type = AVMEDIA_TYPE_DATA;
474 break;
475 default:
476 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
477 goto fail;
478 }
479 if(ast->sample_size == 0)
480 st->duration = st->nb_frames;
481 ast->frame_offset= ast->cum_len;
482 url_fskip(pb, size - 12 * 4);
483 break;
484 case MKTAG('s', 't', 'r', 'f'):
485 /* stream header */
486 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
487 url_fskip(pb, size);
488 } else {
489 uint64_t cur_pos = url_ftell(pb);
490 if (cur_pos < list_end)
491 size = FFMIN(size, list_end - cur_pos);
492 st = s->streams[stream_index];
493 switch(codec_type) {
494 case AVMEDIA_TYPE_VIDEO:
495 if(amv_file_format){
496 st->codec->width=avih_width;
497 st->codec->height=avih_height;
498 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
499 st->codec->codec_id = CODEC_ID_AMV;
500 url_fskip(pb, size);
501 break;
502 }
503 get_le32(pb); /* size */
504 st->codec->width = get_le32(pb);
505 st->codec->height = (int32_t)get_le32(pb);
506 get_le16(pb); /* panes */
507 st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
508 tag1 = get_le32(pb);
509 get_le32(pb); /* ImageSize */
510 get_le32(pb); /* XPelsPerMeter */
511 get_le32(pb); /* YPelsPerMeter */
512 get_le32(pb); /* ClrUsed */
513 get_le32(pb); /* ClrImportant */
514
515 if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
516 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
517 st->codec->codec_tag = tag1;
518 st->codec->codec_id = CODEC_ID_XSUB;
519 break;
520 }
521
522 if(size > 10*4 && size<(1<<30)){
523 st->codec->extradata_size= size - 10*4;
524 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
525 if (!st->codec->extradata) {
526 st->codec->extradata_size= 0;
527 return AVERROR(ENOMEM);
528 }
529 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
530 }
531
532 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
533 get_byte(pb);
534
535 /* Extract palette from extradata if bpp <= 8. */
536 /* This code assumes that extradata contains only palette. */
537 /* This is true for all paletted codecs implemented in FFmpeg. */
538 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
539 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
540 #if HAVE_BIGENDIAN
541 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
542 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
543 #else
544 memcpy(st->codec->palctrl->palette, st->codec->extradata,
545 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
546 #endif
547 st->codec->palctrl->palette_changed = 1;
548 }
549
550 #ifdef DEBUG
551 print_tag("video", tag1, 0);
552 #endif
553 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
554 st->codec->codec_tag = tag1;
555 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
556 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
557 // Support "Resolution 1:1" for Avid AVI Codec
558 if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
559 st->codec->extradata_size >= 31 &&
560 !memcmp(&st->codec->extradata[28], "1:1", 3))
561 st->codec->codec_id = CODEC_ID_RAWVIDEO;
562
563 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
564 st->codec->extradata_size+= 9;
565 st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
566 if(st->codec->extradata)
567 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
568 }
569 st->codec->height= FFABS(st->codec->height);
570
571 // url_fskip(pb, size - 5 * 4);
572 break;
573 case AVMEDIA_TYPE_AUDIO:
574 ff_get_wav_header(pb, st->codec, size);
575 ast->block_align= st->codec->block_align;
576 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
577 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
578 ast->sample_size= st->codec->block_align;
579 }
580 if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
581 url_fskip(pb, 1);
582 /* Force parsing as several audio frames can be in
583 * one packet and timestamps refer to packet start. */
584 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
585 /* ADTS header is in extradata, AAC without header must be
586 * stored as exact frames. Parser not needed and it will
587 * fail. */
588 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
589 st->need_parsing = AVSTREAM_PARSE_NONE;
590 /* AVI files with Xan DPCM audio (wrongly) declare PCM
591 * audio in the header but have Axan as stream_code_tag. */
592 if (st->codec->stream_codec_tag == AV_RL32("Axan")){
593 st->codec->codec_id = CODEC_ID_XAN_DPCM;
594 st->codec->codec_tag = 0;
595 }
596 if (amv_file_format)
597 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
598 break;
599 default:
600 st->codec->codec_type = AVMEDIA_TYPE_DATA;
601 st->codec->codec_id= CODEC_ID_NONE;
602 st->codec->codec_tag= 0;
603 url_fskip(pb, size);
604 break;
605 }
606 }
607 break;
608 case MKTAG('i', 'n', 'd', 'x'):
609 i= url_ftell(pb);
610 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
611 read_braindead_odml_indx(s, 0);
612 }
613 url_fseek(pb, i+size, SEEK_SET);
614 break;
615 case MKTAG('v', 'p', 'r', 'p'):
616 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
617 AVRational active, active_aspect;
618
619 st = s->streams[stream_index];
620 get_le32(pb);
621 get_le32(pb);
622 get_le32(pb);
623 get_le32(pb);
624 get_le32(pb);
625
626 active_aspect.den= get_le16(pb);
627 active_aspect.num= get_le16(pb);
628 active.num = get_le32(pb);
629 active.den = get_le32(pb);
630 get_le32(pb); //nbFieldsPerFrame
631
632 if(active_aspect.num && active_aspect.den && active.num && active.den){
633 st->sample_aspect_ratio= av_div_q(active_aspect, active);
634 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
635 }
636 size -= 9*4;
637 }
638 url_fseek(pb, size, SEEK_CUR);
639 break;
640 case MKTAG('s', 't', 'r', 'n'):
641 if(s->nb_streams){
642 avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
643 break;
644 }
645 default:
646 if(size > 1000000){
647 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
648 "I will ignore it and try to continue anyway.\n");
649 avi->movi_list = url_ftell(pb) - 4;
650 avi->movi_end = url_fsize(pb);
651 goto end_of_header;
652 }
653 /* skip tag */
654 size += (size & 1);
655 url_fskip(pb, size);
656 break;
657 }
658 }
659 end_of_header:
660 /* check stream number */
661 if (stream_index != s->nb_streams - 1) {
662 fail:
663 return -1;
664 }
665
666 if(!avi->index_loaded && !url_is_streamed(pb))
667 avi_load_index(s);
668 avi->index_loaded = 1;
669 avi->non_interleaved |= guess_ni_flag(s);
670 for(i=0; i<s->nb_streams; i++){
671 AVStream *st = s->streams[i];
672 if(st->nb_index_entries)
673 break;
674 }
675 if(i==s->nb_streams && avi->non_interleaved) {
676 av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
677 avi->non_interleaved=0;
678 }
679
680 if(avi->non_interleaved) {
681 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
682 clean_index(s);
683 }
684
685 return 0;
686 }
687
688 static int get_stream_idx(int *d){
689 if( d[0] >= '0' && d[0] <= '9'
690 && d[1] >= '0' && d[1] <= '9'){
691 return (d[0] - '0') * 10 + (d[1] - '0');
692 }else{
693 return 100; //invalid stream ID
694 }
695 }
696
697 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
698 {
699 AVIContext *avi = s->priv_data;
700 ByteIOContext *pb = s->pb;
701 int n, d[8];
702 unsigned int size;
703 int64_t i, sync;
704 void* dstr;
705
706 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
707 int size = dv_get_packet(avi->dv_demux, pkt);
708 if (size >= 0)
709 return size;
710 }
711
712 if(avi->non_interleaved){
713 int best_stream_index = 0;
714 AVStream *best_st= NULL;
715 AVIStream *best_ast;
716 int64_t best_ts= INT64_MAX;
717 int i;
718
719 for(i=0; i<s->nb_streams; i++){
720 AVStream *st = s->streams[i];
721 AVIStream *ast = st->priv_data;
722 int64_t ts= ast->frame_offset;
723 int64_t last_ts;
724
725 if(!st->nb_index_entries)
726 continue;
727
728 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
729 if(!ast->remaining && ts > last_ts)
730 continue;
731
732 ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
733
734 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
735 if(ts < best_ts){
736 best_ts= ts;
737 best_st= st;
738 best_stream_index= i;
739 }
740 }
741 if(!best_st)
742 return -1;
743
744 best_ast = best_st->priv_data;
745 best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
746 if(best_ast->remaining)
747 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
748 else{
749 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
750 if(i>=0)
751 best_ast->frame_offset= best_st->index_entries[i].timestamp;
752 }
753
754 // av_log(s, AV_LOG_DEBUG, "%d\n", i);
755 if(i>=0){
756 int64_t pos= best_st->index_entries[i].pos;
757 pos += best_ast->packet_size - best_ast->remaining;
758 url_fseek(s->pb, pos + 8, SEEK_SET);
759 // av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
760
761 assert(best_ast->remaining <= best_ast->packet_size);
762
763 avi->stream_index= best_stream_index;
764 if(!best_ast->remaining)
765 best_ast->packet_size=
766 best_ast->remaining= best_st->index_entries[i].size;
767 }
768 }
769
770 resync:
771 if(avi->stream_index >= 0){
772 AVStream *st= s->streams[ avi->stream_index ];
773 AVIStream *ast= st->priv_data;
774 int size, err;
775
776 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
777 size= INT_MAX;
778 else if(ast->sample_size < 32)
779 // arbitrary multiplier to avoid tiny packets for raw PCM data
780 size= 1024*ast->sample_size;
781 else
782 size= ast->sample_size;
783
784 if(size > ast->remaining)
785 size= ast->remaining;
786 avi->last_pkt_pos= url_ftell(pb);
787 err= av_get_packet(pb, pkt, size);
788 if(err<0)
789 return err;
790
791 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
792 void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
793 if(ptr){
794 ast->has_pal=0;
795 pkt->size += 4*256;
796 pkt->data= ptr;
797 memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
798 }else
799 av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
800 }
801
802 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
803 dstr = pkt->destruct;
804 size = dv_produce_packet(avi->dv_demux, pkt,
805 pkt->data, pkt->size);
806 pkt->destruct = dstr;
807 pkt->flags |= AV_PKT_FLAG_KEY;
808 } else {
809 /* XXX: How to handle B-frames in AVI? */
810 pkt->dts = ast->frame_offset;
811 // pkt->dts += ast->start;
812 if(ast->sample_size)
813 pkt->dts /= ast->sample_size;
814 //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);
815 pkt->stream_index = avi->stream_index;
816
817 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
818 AVIndexEntry *e;
819 int index;
820 assert(st->index_entries);
821
822 index= av_index_search_timestamp(st, ast->frame_offset, 0);
823 e= &st->index_entries[index];
824
825 if(index >= 0 && e->timestamp == ast->frame_offset){
826 if (e->flags & AVINDEX_KEYFRAME)
827 pkt->flags |= AV_PKT_FLAG_KEY;
828 }
829 } else {
830 pkt->flags |= AV_PKT_FLAG_KEY;
831 }
832 ast->frame_offset += get_duration(ast, pkt->size);
833 }
834 ast->remaining -= size;
835 if(!ast->remaining){
836 avi->stream_index= -1;
837 ast->packet_size= 0;
838 }
839
840 return size;
841 }
842
843 memset(d, -1, sizeof(int)*8);
844 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
845 int j;
846
847 for(j=0; j<7; j++)
848 d[j]= d[j+1];
849 d[7]= get_byte(pb);
850
851 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
852
853 n= get_stream_idx(d+2);
854 //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);
855 if(i + (uint64_t)size > avi->fsize || d[0]<0)
856 continue;
857
858 //parse ix##
859 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
860 //parse JUNK
861 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
862 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
863 url_fskip(pb, size);
864 //av_log(s, AV_LOG_DEBUG, "SKIP\n");
865 goto resync;
866 }
867
868 //parse stray LIST
869 if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
870 url_fskip(pb, 4);
871 goto resync;
872 }
873
874 n= get_stream_idx(d);
875
876 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
877 continue;
878
879 //detect ##ix chunk and skip
880 if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
881 url_fskip(pb, size);
882 goto resync;
883 }
884
885 //parse ##dc/##wb
886 if(n < s->nb_streams){
887 AVStream *st;
888 AVIStream *ast;
889 st = s->streams[n];
890 ast = st->priv_data;
891
892 if(s->nb_streams>=2){
893 AVStream *st1 = s->streams[1];
894 AVIStream *ast1= st1->priv_data;
895 //workaround for broken small-file-bug402.avi
896 if( d[2] == 'w' && d[3] == 'b'
897 && n==0
898 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
899 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
900 && ast->prefix == 'd'*256+'c'
901 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
902 ){
903 n=1;
904 st = st1;
905 ast = ast1;
906 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
907 }
908 }
909
910
911 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
912 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
913 || st->discard >= AVDISCARD_ALL){
914 ast->frame_offset += get_duration(ast, size);
915 url_fskip(pb, size);
916 goto resync;
917 }
918
919 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
920 int k = get_byte(pb);
921 int last = (k + get_byte(pb) - 1) & 0xFF;
922
923 get_le16(pb); //flags
924
925 for (; k <= last; k++)
926 ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
927 ast->has_pal= 1;
928 goto resync;
929 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
930 d[2]*256+d[3] == ast->prefix /*||
931 (d[2] == 'd' && d[3] == 'c') ||
932 (d[2] == 'w' && d[3] == 'b')*/) {
933
934 //av_log(s, AV_LOG_DEBUG, "OK\n");
935 if(d[2]*256+d[3] == ast->prefix)
936 ast->prefix_count++;
937 else{
938 ast->prefix= d[2]*256+d[3];
939 ast->prefix_count= 0;
940 }
941
942 avi->stream_index= n;
943 ast->packet_size= size + 8;
944 ast->remaining= size;
945
946 if(size || !ast->sample_size){
947 uint64_t pos= url_ftell(pb) - 8;
948 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
949 av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
950 }
951 }
952 goto resync;
953 }
954 }
955 }
956
957 return AVERROR_EOF;
958 }
959
960 /* XXX: We make the implicit supposition that the positions are sorted
961 for each stream. */
962 static int avi_read_idx1(AVFormatContext *s, int size)
963 {
964 AVIContext *avi = s->priv_data;
965 ByteIOContext *pb = s->pb;
966 int nb_index_entries, i;
967 AVStream *st;
968 AVIStream *ast;
969 unsigned int index, tag, flags, pos, len;
970 unsigned last_pos= -1;
971
972 nb_index_entries = size / 16;
973 if (nb_index_entries <= 0)
974 return -1;
975
976 /* Read the entries and sort them in each stream component. */
977 for(i = 0; i < nb_index_entries; i++) {
978 tag = get_le32(pb);
979 flags = get_le32(pb);
980 pos = get_le32(pb);
981 len = get_le32(pb);
982 #if defined(DEBUG_SEEK)
983 av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
984 i, tag, flags, pos, len);
985 #endif
986 if(i==0 && pos > avi->movi_list)
987 avi->movi_list= 0; //FIXME better check
988 pos += avi->movi_list;
989
990 index = ((tag & 0xff) - '0') * 10;
991 index += ((tag >> 8) & 0xff) - '0';
992 if (index >= s->nb_streams)
993 continue;
994 st = s->streams[index];
995 ast = st->priv_data;
996
997 #if defined(DEBUG_SEEK)
998 av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
999 #endif
1000 if(url_feof(pb))
1001 return -1;
1002
1003 if(last_pos == pos)
1004 avi->non_interleaved= 1;
1005 else if(len || !ast->sample_size)
1006 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1007 ast->cum_len += get_duration(ast, len);
1008 last_pos= pos;
1009 }
1010 return 0;
1011 }
1012
1013 static int guess_ni_flag(AVFormatContext *s){
1014 int i;
1015 int64_t last_start=0;
1016 int64_t first_end= INT64_MAX;
1017 int64_t oldpos= url_ftell(s->pb);
1018
1019 for(i=0; i<s->nb_streams; i++){
1020 AVStream *st = s->streams[i];
1021 int n= st->nb_index_entries;
1022 unsigned int size;
1023
1024 if(n <= 0)
1025 continue;
1026
1027 if(n >= 2){
1028 int64_t pos= st->index_entries[0].pos;
1029 url_fseek(s->pb, pos + 4, SEEK_SET);
1030 size= get_le32(s->pb);
1031 if(pos + size > st->index_entries[1].pos)
1032 last_start= INT64_MAX;
1033 }
1034
1035 if(st->index_entries[0].pos > last_start)
1036 last_start= st->index_entries[0].pos;
1037 if(st->index_entries[n-1].pos < first_end)
1038 first_end= st->index_entries[n-1].pos;
1039 }
1040 url_fseek(s->pb, oldpos, SEEK_SET);
1041 return last_start > first_end;
1042 }
1043
1044 static int avi_load_index(AVFormatContext *s)
1045 {
1046 AVIContext *avi = s->priv_data;
1047 ByteIOContext *pb = s->pb;
1048 uint32_t tag, size;
1049 int64_t pos= url_ftell(pb);
1050 int ret = -1;
1051
1052 if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0)
1053 goto the_end; // maybe truncated file
1054 #ifdef DEBUG_SEEK
1055 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1056 #endif
1057 for(;;) {
1058 if (url_feof(pb))
1059 break;
1060 tag = get_le32(pb);
1061 size = get_le32(pb);
1062 #ifdef DEBUG_SEEK
1063 printf("tag=%c%c%c%c size=0x%x\n",
1064 tag & 0xff,
1065 (tag >> 8) & 0xff,
1066 (tag >> 16) & 0xff,
1067 (tag >> 24) & 0xff,
1068 size);
1069 #endif
1070 switch(tag) {
1071 case MKTAG('i', 'd', 'x', '1'):
1072 if (avi_read_idx1(s, size) < 0)
1073 goto skip;
1074 ret = 0;
1075 goto the_end;
1076 break;
1077 default:
1078 skip:
1079 size += (size & 1);
1080 if (url_fseek(pb, size, SEEK_CUR) < 0)
1081 goto the_end; // something is wrong here
1082 break;
1083 }
1084 }
1085 the_end:
1086 url_fseek(pb, pos, SEEK_SET);
1087 return ret;
1088 }
1089
1090 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1091 {
1092 AVIContext *avi = s->priv_data;
1093 AVStream *st;
1094 int i, index;
1095 int64_t pos;
1096 AVIStream *ast;
1097
1098 if (!avi->index_loaded) {
1099 /* we only load the index on demand */
1100 avi_load_index(s);
1101 avi->index_loaded = 1;
1102 }
1103 assert(stream_index>= 0);
1104
1105 st = s->streams[stream_index];
1106 ast= st->priv_data;
1107 index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1108 if(index<0)
1109 return -1;
1110
1111 /* find the position */
1112 pos = st->index_entries[index].pos;
1113 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1114
1115 // av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1116
1117 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1118 /* One and only one real stream for DV in AVI, and it has video */
1119 /* offsets. Calling with other stream indexes should have failed */
1120 /* the av_index_search_timestamp call above. */
1121 assert(stream_index == 0);
1122
1123 /* Feed the DV video stream version of the timestamp to the */
1124 /* DV demux so it can synthesize correct timestamps. */
1125 dv_offset_reset(avi->dv_demux, timestamp);
1126
1127 url_fseek(s->pb, pos, SEEK_SET);
1128 avi->stream_index= -1;
1129 return 0;
1130 }
1131
1132 for(i = 0; i < s->nb_streams; i++) {
1133 AVStream *st2 = s->streams[i];
1134 AVIStream *ast2 = st2->priv_data;
1135
1136 ast2->packet_size=
1137 ast2->remaining= 0;
1138
1139 if (st2->nb_index_entries <= 0)
1140 continue;
1141
1142 // assert(st2->codec->block_align);
1143 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1144 index = av_index_search_timestamp(
1145 st2,
1146 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1147 flags | AVSEEK_FLAG_BACKWARD);
1148 if(index<0)
1149 index=0;
1150
1151 if(!avi->non_interleaved){
1152 while(index>0 && st2->index_entries[index].pos > pos)
1153 index--;
1154 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1155 index++;
1156 }
1157
1158 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1159 /* extract the current frame number */
1160 ast2->frame_offset = st2->index_entries[index].timestamp;
1161 }
1162
1163 /* do the seek */
1164 url_fseek(s->pb, pos, SEEK_SET);
1165 avi->stream_index= -1;
1166 return 0;
1167 }
1168
1169 static int avi_read_close(AVFormatContext *s)
1170 {
1171 int i;
1172 AVIContext *avi = s->priv_data;
1173
1174 for(i=0;i<s->nb_streams;i++) {
1175 AVStream *st = s->streams[i];
1176 av_free(st->codec->palctrl);
1177 }
1178
1179 if (avi->dv_demux)
1180 av_free(avi->dv_demux);
1181
1182 return 0;
1183 }
1184
1185 static int avi_probe(AVProbeData *p)
1186 {
1187 int i;
1188
1189 /* check file header */
1190 for(i=0; avi_headers[i][0]; i++)
1191 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1192 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1193 return AVPROBE_SCORE_MAX;
1194
1195 return 0;
1196 }
1197
1198 AVInputFormat avi_demuxer = {
1199 "avi",
1200 NULL_IF_CONFIG_SMALL("AVI format"),
1201 sizeof(AVIContext),
1202 avi_probe,
1203 avi_read_header,
1204 avi_read_packet,
1205 avi_read_close,
1206 avi_read_seek,
1207 .metadata_conv = ff_avi_metadata_conv,
1208 };