slice-based idwt (10% faster decoding)
[libav.git] / libavformat / avidec.c
CommitLineData
de6d9b64
FB
1/*
2 * AVI decoder.
19720f15 3 * Copyright (c) 2001 Fabrice Bellard.
de6d9b64 4 *
19720f15
FB
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
de6d9b64 9 *
19720f15 10 * This library is distributed in the hope that it will be useful,
de6d9b64 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19720f15
FB
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
de6d9b64 14 *
19720f15
FB
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
de6d9b64 18 */
de6d9b64
FB
19#include "avformat.h"
20#include "avi.h"
7458ccbb 21#include "dv.h"
de6d9b64 22
52a0bbff
MN
23#undef NDEBUG
24#include <assert.h>
25
de6d9b64 26//#define DEBUG
155e9ee9
FB
27//#define DEBUG_SEEK
28
155e9ee9 29typedef struct AVIStream {
7c7f3866 30 int64_t frame_offset; /* current frame (video) or byte (audio) counter
155e9ee9 31 (used to compute the pts) */
7c7f3866
MN
32 int remaining;
33 int packet_size;
34
155e9ee9
FB
35 int scale;
36 int rate;
37 int sample_size; /* audio only data */
1fa3d65d 38 int start;
155e9ee9 39
155e9ee9 40 int cum_len; /* temporary storage (used during seek) */
d2c5f0a4
MN
41
42 int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
43 int prefix_count;
155e9ee9 44} AVIStream;
de6d9b64
FB
45
46typedef struct {
7458ccbb
RS
47 int64_t riff_end;
48 int64_t movi_end;
de6d9b64 49 offset_t movi_list;
155e9ee9 50 int index_loaded;
8f9298f8 51 int is_odml;
7c7f3866
MN
52 int non_interleaved;
53 int stream_index;
ddaae6a9 54 DVDemuxContext* dv_demux;
de6d9b64
FB
55} AVIContext;
56
42feef6b
MN
57static int avi_load_index(AVFormatContext *s);
58
de6d9b64 59#ifdef DEBUG
1101abfe 60static void print_tag(const char *str, unsigned int tag, int size)
de6d9b64
FB
61{
62 printf("%s: tag=%c%c%c%c size=0x%x\n",
63 str, tag & 0xff,
64 (tag >> 8) & 0xff,
65 (tag >> 16) & 0xff,
66 (tag >> 24) & 0xff,
67 size);
68}
69#endif
70
06219cb1
RS
71static int get_riff(AVIContext *avi, ByteIOContext *pb)
72{
73 uint32_t tag;
74 /* check RIFF header */
75 tag = get_le32(pb);
76
77 if (tag != MKTAG('R', 'I', 'F', 'F'))
78 return -1;
79 avi->riff_end = get_le32(pb); /* RIFF chunk size */
80 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
81 tag = get_le32(pb);
82 if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
83 return -1;
84
85 return 0;
86}
87
1101abfe 88static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
de6d9b64 89{
c9a65ca8 90 AVIContext *avi = s->priv_data;
de6d9b64 91 ByteIOContext *pb = &s->pb;
deb0a292 92 uint32_t tag, tag1, handler;
b559b29b 93 int codec_type, stream_index, frame_period, bit_rate, scale, rate;
247eadca
FB
94 unsigned int size, nb_frames;
95 int i, n;
de6d9b64 96 AVStream *st;
155e9ee9 97 AVIStream *ast;
9e8cd0db 98 int xan_video = 0; /* hack to support Xan A/V */
de6d9b64 99
7c7f3866
MN
100 avi->stream_index= -1;
101
06219cb1 102 if (get_riff(avi, pb) < 0)
de6d9b64 103 return -1;
1101abfe 104
de6d9b64
FB
105 /* first list tag */
106 stream_index = -1;
107 codec_type = -1;
108 frame_period = 0;
109 for(;;) {
110 if (url_feof(pb))
111 goto fail;
112 tag = get_le32(pb);
113 size = get_le32(pb);
114#ifdef DEBUG
115 print_tag("tag", tag, size);
116#endif
117
118 switch(tag) {
119 case MKTAG('L', 'I', 'S', 'T'):
120 /* ignored, except when start of video packets */
121 tag1 = get_le32(pb);
122#ifdef DEBUG
123 print_tag("list", tag1, 0);
124#endif
125 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
155e9ee9 126 avi->movi_list = url_ftell(pb) - 4;
f8facaaf
MN
127 if(size) avi->movi_end = avi->movi_list + size;
128 else avi->movi_end = url_filesize(url_fileno(pb));
de6d9b64
FB
129#ifdef DEBUG
130 printf("movi end=%Lx\n", avi->movi_end);
131#endif
132 goto end_of_header;
133 }
134 break;
8f9298f8
RS
135 case MKTAG('d', 'm', 'l', 'h'):
136 avi->is_odml = 1;
137 url_fskip(pb, size + (size & 1));
138 break;
de6d9b64 139 case MKTAG('a', 'v', 'i', 'h'):
1101abfe
ZK
140 /* avi header */
141 /* using frame_period is bad idea */
de6d9b64
FB
142 frame_period = get_le32(pb);
143 bit_rate = get_le32(pb) * 8;
1101abfe 144 url_fskip(pb, 4 * 4);
247eadca
FB
145 n = get_le32(pb);
146 for(i=0;i<n;i++) {
155e9ee9 147 AVIStream *ast;
7458ccbb 148 st = av_new_stream(s, i);
de6d9b64
FB
149 if (!st)
150 goto fail;
9ee91c2f 151
155e9ee9
FB
152 ast = av_mallocz(sizeof(AVIStream));
153 if (!ast)
154 goto fail;
155 st->priv_data = ast;
1101abfe 156 }
de6d9b64
FB
157 url_fskip(pb, size - 7 * 4);
158 break;
159 case MKTAG('s', 't', 'r', 'h'):
160 /* stream header */
161 stream_index++;
162 tag1 = get_le32(pb);
7458ccbb 163 handler = get_le32(pb); /* codec tag */
cc11e2b3
MN
164#ifdef DEBUG
165 print_tag("strh", tag1, -1);
166#endif
de6d9b64 167 switch(tag1) {
deb0a292
RS
168 case MKTAG('i', 'a', 'v', 's'):
169 case MKTAG('i', 'v', 'a', 's'):
7458ccbb
RS
170 /*
171 * After some consideration -- I don't think we
172 * have to support anything but DV in a type1 AVIs.
173 */
deb0a292
RS
174 if (s->nb_streams != 1)
175 goto fail;
7458ccbb
RS
176
177 if (handler != MKTAG('d', 'v', 's', 'd') &&
178 handler != MKTAG('d', 'v', 'h', 'd') &&
179 handler != MKTAG('d', 'v', 's', 'l'))
180 goto fail;
ddaae6a9 181
2c3cee34 182 ast = s->streams[0]->priv_data;
ddaae6a9
RS
183 av_freep(&s->streams[0]->codec.extradata);
184 av_freep(&s->streams[0]);
185 s->nb_streams = 0;
186 avi->dv_demux = dv_init_demux(s);
7458ccbb
RS
187 if (!avi->dv_demux)
188 goto fail;
2c3cee34
RS
189 s->streams[0]->priv_data = ast;
190 url_fskip(pb, 3 * 4);
191 ast->scale = get_le32(pb);
192 ast->rate = get_le32(pb);
ddaae6a9 193 stream_index = s->nb_streams - 1;
2c3cee34 194 url_fskip(pb, size - 7*4);
ddaae6a9 195 break;
deb0a292 196 case MKTAG('v', 'i', 'd', 's'):
de6d9b64 197 codec_type = CODEC_TYPE_VIDEO;
b559b29b
MN
198
199 if (stream_index >= s->nb_streams) {
7458ccbb 200 url_fskip(pb, size - 8);
b559b29b
MN
201 break;
202 }
203
204 st = s->streams[stream_index];
155e9ee9 205 ast = st->priv_data;
76e9d392 206 st->codec.stream_codec_tag= handler;
155e9ee9 207
de6d9b64
FB
208 get_le32(pb); /* flags */
209 get_le16(pb); /* priority */
210 get_le16(pb); /* language */
211 get_le32(pb); /* XXX: initial frame ? */
deb0a292
RS
212 scale = get_le32(pb); /* scale */
213 rate = get_le32(pb); /* rate */
b559b29b 214
14bea432 215 if(scale && rate){
14bea432 216 }else if(frame_period){
155e9ee9
FB
217 rate = 1000000;
218 scale = frame_period;
14bea432 219 }else{
155e9ee9
FB
220 rate = 25;
221 scale = 1;
14bea432 222 }
155e9ee9
FB
223 ast->rate = rate;
224 ast->scale = scale;
cdd5034f 225 av_set_pts_info(st, 64, scale, rate);
155e9ee9
FB
226 st->codec.frame_rate = rate;
227 st->codec.frame_rate_base = scale;
247eadca
FB
228 get_le32(pb); /* start */
229 nb_frames = get_le32(pb);
230 st->start_time = 0;
cde073b4 231 st->duration = av_rescale(nb_frames,
8d65750e 232 st->codec.frame_rate_base * (int64_t)AV_TIME_BASE,
cde073b4 233 st->codec.frame_rate);
247eadca 234 url_fskip(pb, size - 9 * 4);
de6d9b64
FB
235 break;
236 case MKTAG('a', 'u', 'd', 's'):
247eadca 237 {
155e9ee9 238 unsigned int length;
247eadca
FB
239
240 codec_type = CODEC_TYPE_AUDIO;
241
242 if (stream_index >= s->nb_streams) {
7458ccbb 243 url_fskip(pb, size - 8);
247eadca
FB
244 break;
245 }
246 st = s->streams[stream_index];
155e9ee9
FB
247 ast = st->priv_data;
248
247eadca
FB
249 get_le32(pb); /* flags */
250 get_le16(pb); /* priority */
251 get_le16(pb); /* language */
252 get_le32(pb); /* initial frame */
155e9ee9
FB
253 ast->scale = get_le32(pb); /* scale */
254 ast->rate = get_le32(pb);
55c7e4ad
MN
255 if(!ast->rate)
256 ast->rate= 1; //wrong but better then 1/0
0fbc6961
MN
257 if(!ast->scale)
258 ast->scale= 1; //wrong but better then 1/0
cdd5034f 259 av_set_pts_info(st, 64, ast->scale, ast->rate);
1fa3d65d 260 ast->start= get_le32(pb); /* start */
247eadca 261 length = get_le32(pb); /* length, in samples or bytes */
155e9ee9
FB
262 get_le32(pb); /* buffer size */
263 get_le32(pb); /* quality */
264 ast->sample_size = get_le32(pb); /* sample ssize */
1fa3d65d 265//av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->scale, ast->rate, ast->sample_size, ast->start);
247eadca 266 st->start_time = 0;
cb43c0e1 267 st->duration = av_rescale(length, ast->scale*(int64_t)AV_TIME_BASE, ast->rate);
155e9ee9 268 url_fskip(pb, size - 12 * 4);
247eadca 269 }
9bf9a5fc 270 break;
cc11e2b3
MN
271 case MKTAG('t', 'x', 't', 's'):
272 //FIXME
273 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
274 url_fskip(pb, size - 8);
275 break;
30667f42
MN
276 case MKTAG('p', 'a', 'd', 's'):
277 codec_type = CODEC_TYPE_UNKNOWN;
278 url_fskip(pb, size - 8);
279 stream_index--;
280 break;
9bf9a5fc 281 default:
30667f42 282 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
9bf9a5fc 283 goto fail;
de6d9b64
FB
284 }
285 break;
286 case MKTAG('s', 't', 'r', 'f'):
287 /* stream header */
7458ccbb 288 if (stream_index >= s->nb_streams || avi->dv_demux) {
de6d9b64
FB
289 url_fskip(pb, size);
290 } else {
291 st = s->streams[stream_index];
292 switch(codec_type) {
293 case CODEC_TYPE_VIDEO:
294 get_le32(pb); /* size */
295 st->codec.width = get_le32(pb);
296 st->codec.height = get_le32(pb);
de6d9b64 297 get_le16(pb); /* panes */
b559b29b 298 st->codec.bits_per_sample= get_le16(pb); /* depth */
de6d9b64 299 tag1 = get_le32(pb);
b559b29b
MN
300 get_le32(pb); /* ImageSize */
301 get_le32(pb); /* XPelsPerMeter */
302 get_le32(pb); /* YPelsPerMeter */
303 get_le32(pb); /* ClrUsed */
304 get_le32(pb); /* ClrImportant */
305
568e18b1 306 if(size > 10*4 && size<(1<<30)){
b559b29b 307 st->codec.extradata_size= size - 10*4;
3129cd01 308 st->codec.extradata= av_malloc(st->codec.extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
b559b29b 309 get_buffer(pb, st->codec.extradata, st->codec.extradata_size);
568e18b1 310 }
952c69c4
MN
311
312 if(st->codec.extradata_size & 1) //FIXME check if the encoder really did this correctly
313 get_byte(pb);
b559b29b 314
5e29abf8
RT
315 /* Extract palette from extradata if bpp <= 8 */
316 /* This code assumes that extradata contains only palette */
317 /* This is true for all paletted codecs implemented in ffmpeg */
318 if (st->codec.extradata_size && (st->codec.bits_per_sample <= 8)) {
319 st->codec.palctrl = av_mallocz(sizeof(AVPaletteControl));
320#ifdef WORDS_BIGENDIAN
19d053c5
RS
321 for (i = 0; i < FFMIN(st->codec.extradata_size, AVPALETTE_SIZE)/4; i++)
322 st->codec.palctrl->palette[i] = bswap_32(((uint32_t*)st->codec.extradata)[i]);
5e29abf8
RT
323#else
324 memcpy(st->codec.palctrl->palette, st->codec.extradata,
325 FFMIN(st->codec.extradata_size, AVPALETTE_SIZE));
326#endif
327 st->codec.palctrl->palette_changed = 1;
328 }
329
de6d9b64
FB
330#ifdef DEBUG
331 print_tag("video", tag1, 0);
332#endif
333 st->codec.codec_type = CODEC_TYPE_VIDEO;
334 st->codec.codec_tag = tag1;
335 st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);
9e8cd0db
MM
336 if (st->codec.codec_id == CODEC_ID_XAN_WC4)
337 xan_video = 1;
b559b29b 338// url_fskip(pb, size - 5 * 4);
de6d9b64 339 break;
9bf9a5fc 340 case CODEC_TYPE_AUDIO:
2e7973bb 341 get_wav_header(pb, &st->codec, size);
1cef9527
FR
342 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
343 url_fskip(pb, 1);
9e8cd0db
MM
344 /* special case time: To support Xan DPCM, hardcode
345 * the format if Xxan is the video codec */
155e9ee9
FB
346 st->need_parsing = 1;
347 /* force parsing as several audio frames can be in
348 one packet */
9e8cd0db
MM
349 if (xan_video)
350 st->codec.codec_id = CODEC_ID_XAN_DPCM;
de6d9b64
FB
351 break;
352 default:
75204092
MN
353 st->codec.codec_type = CODEC_TYPE_DATA;
354 st->codec.codec_id= CODEC_ID_NONE;
355 st->codec.codec_tag= 0;
de6d9b64
FB
356 url_fskip(pb, size);
357 break;
358 }
359 }
360 break;
361 default:
362 /* skip tag */
363 size += (size & 1);
364 url_fskip(pb, size);
365 break;
366 }
367 }
368 end_of_header:
369 /* check stream number */
370 if (stream_index != s->nb_streams - 1) {
371 fail:
372 for(i=0;i<s->nb_streams;i++) {
8a7b1b18 373 av_freep(&s->streams[i]->codec.extradata);
9145f8b3 374 av_freep(&s->streams[i]);
de6d9b64
FB
375 }
376 return -1;
377 }
1101abfe 378
42feef6b
MN
379 assert(!avi->index_loaded);
380 avi_load_index(s);
381 avi->index_loaded = 1;
382
de6d9b64
FB
383 return 0;
384}
385
1101abfe 386static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
de6d9b64
FB
387{
388 AVIContext *avi = s->priv_data;
389 ByteIOContext *pb = &s->pb;
8f9298f8 390 int n, d[8], size;
4a8d5135 391 offset_t i, sync;
7458ccbb 392 void* dstr;
7458ccbb
RS
393
394 if (avi->dv_demux) {
395 size = dv_get_packet(avi->dv_demux, pkt);
396 if (size >= 0)
397 return size;
2af7e610 398 }
7c7f3866
MN
399
400 if(avi->non_interleaved){
401 int best_stream_index;
402 AVStream *best_st= NULL;
403 AVIStream *best_ast;
404 int64_t best_ts= INT64_MAX;
405 int i;
406
407 for(i=0; i<s->nb_streams; i++){
408 AVStream *st = s->streams[i];
409 AVIStream *ast = st->priv_data;
410 int64_t ts= ast->frame_offset;
411
412 if(ast->sample_size)
413 ts /= ast->sample_size;
414 ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
415
416// av_log(NULL, AV_LOG_DEBUG, "%Ld %d/%d %Ld\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
417 if(ts < best_ts){
418 best_ts= ts;
419 best_st= st;
420 best_stream_index= i;
421 }
422 }
423 best_ast = best_st->priv_data;
424 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
425 if(best_ast->remaining)
426 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
427 else
428 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
429
430// av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
431 if(i>=0){
432 int64_t pos= best_st->index_entries[i].pos;
433 pos += avi->movi_list + best_ast->packet_size - best_ast->remaining;
434 url_fseek(&s->pb, pos, SEEK_SET);
435// av_log(NULL, AV_LOG_DEBUG, "pos=%Ld\n", pos);
436
437 if(best_ast->remaining)
438 avi->stream_index= best_stream_index;
439 else
440 avi->stream_index= -1;
441 }
442 }
443
4a8d5135 444resync:
7c7f3866
MN
445 if(avi->stream_index >= 0){
446 AVStream *st= s->streams[ avi->stream_index ];
447 AVIStream *ast= st->priv_data;
448 int size;
449
450 assert(ast->remaining);
451
452 if(ast->sample_size == 0)
453 size= INT_MAX;
454 else if(ast->sample_size < 32)
455 size= 64*ast->sample_size;
456 else
457 size= ast->sample_size;
458
459 if(size > ast->remaining)
460 size= ast->remaining;
461 av_new_packet(pkt, size);
462 get_buffer(pb, pkt->data, size);
463
464 if (avi->dv_demux) {
465 dstr = pkt->destruct;
466 size = dv_produce_packet(avi->dv_demux, pkt,
467 pkt->data, pkt->size);
468 pkt->destruct = dstr;
469 pkt->flags |= PKT_FLAG_KEY;
470 } else {
471 /* XXX: how to handle B frames in avi ? */
472 pkt->dts = ast->frame_offset;
473// pkt->dts += ast->start;
474 if(ast->sample_size)
475 pkt->dts /= ast->sample_size;
476//av_log(NULL, AV_LOG_DEBUG, "dts:%Ld offset:%d %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, n, size);
477 pkt->stream_index = avi->stream_index;
478
479 if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
480 if(st->index_entries){
481 AVIndexEntry *e;
482 int index;
483
484 index= av_index_search_timestamp(st, pkt->dts, 0);
485 e= &st->index_entries[index];
486
487 if(e->timestamp == ast->frame_offset){
488 if (e->flags & AVINDEX_KEYFRAME)
489 pkt->flags |= PKT_FLAG_KEY;
490 }
491 } else {
492 /* if no index, better to say that all frames
493 are key frames */
494 pkt->flags |= PKT_FLAG_KEY;
495 }
496 } else {
497 pkt->flags |= PKT_FLAG_KEY;
498 }
499 if(ast->sample_size)
500 ast->frame_offset += pkt->size;
501 else
502 ast->frame_offset++;
503 }
504 ast->remaining -= size;
505 if(!ast->remaining){
506 avi->stream_index= -1;
507 ast->packet_size= 0;
508 if (size & 1) {
509 get_byte(pb);
510 size++;
511 }
512 }
513
514 return size;
515 }
516
4a8d5135
MN
517 memset(d, -1, sizeof(int)*8);
518 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
df99755b 519 int j;
1101abfe 520
8f9298f8
RS
521 if (i >= avi->movi_end) {
522 if (avi->is_odml) {
523 url_fskip(pb, avi->riff_end - i);
524 avi->riff_end = avi->movi_end = url_filesize(url_fileno(pb));
525 } else
526 break;
06219cb1
RS
527 }
528
df99755b
MN
529 for(j=0; j<7; j++)
530 d[j]= d[j+1];
531 d[7]= get_byte(pb);
532
533 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
534
df99755b 535 if( d[2] >= '0' && d[2] <= '9'
d2c5f0a4
MN
536 && d[3] >= '0' && d[3] <= '9'){
537 n= (d[2] - '0') * 10 + (d[3] - '0');
538 }else{
539 n= 100; //invalid stream id
df99755b 540 }
d2c5f0a4
MN
541//av_log(NULL, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %lld %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
542 if(i + size > avi->movi_end || d[0]<0)
543 continue;
544
545 //parse ix##
546 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
8f9298f8 547 //parse JUNK
d2c5f0a4 548 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')){
8f9298f8 549 url_fskip(pb, size);
d2c5f0a4 550//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
4a8d5135 551 goto resync;
8f9298f8 552 }
d2c5f0a4 553
df99755b 554 if( d[0] >= '0' && d[0] <= '9'
d2c5f0a4
MN
555 && d[1] >= '0' && d[1] <= '9'){
556 n= (d[0] - '0') * 10 + (d[1] - '0');
557 }else{
558 n= 100; //invalid stream id
559 }
df99755b 560
d2c5f0a4 561 //parse ##dc/##wb
7c7f3866 562 if(n < s->nb_streams && size){
d2c5f0a4
MN
563 AVStream *st;
564 AVIStream *ast;
565 st = s->streams[n];
566 ast = st->priv_data;
b4aea108
MN
567
568 if(st->discard){
569 url_fskip(pb, size);
570 goto resync;
571 }
d2c5f0a4 572
4a8d5135 573 if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
d2c5f0a4
MN
574 d[2]*256+d[3] == ast->prefix /*||
575 (d[2] == 'd' && d[3] == 'c') ||
576 (d[2] == 'w' && d[3] == 'b')*/) {
577
578//av_log(NULL, AV_LOG_DEBUG, "OK\n");
579 if(d[2]*256+d[3] == ast->prefix)
580 ast->prefix_count++;
581 else{
582 ast->prefix= d[2]*256+d[3];
583 ast->prefix_count= 0;
584 }
585
7c7f3866
MN
586 avi->stream_index= n;
587 ast->packet_size= size + 8;
588 ast->remaining= size;
589 goto resync;
590
d2c5f0a4 591 }
df99755b 592 }
69bde0b2
MM
593 /* palette changed chunk */
594 if ( d[0] >= '0' && d[0] <= '9'
595 && d[1] >= '0' && d[1] <= '9'
596 && ((d[2] == 'p' && d[3] == 'c'))
597 && n < s->nb_streams && i + size <= avi->movi_end) {
598
599 AVStream *st;
600 int first, clr, flags, k, p;
601
602 st = s->streams[n];
603
604 first = get_byte(pb);
605 clr = get_byte(pb);
61c52ead
KS
606 if(!clr) /* all 256 colors used */
607 clr = 256;
69bde0b2
MM
608 flags = get_le16(pb);
609 p = 4;
610 for (k = first; k < clr + first; k++) {
611 int r, g, b;
612 r = get_byte(pb);
613 g = get_byte(pb);
614 b = get_byte(pb);
615 get_byte(pb);
616 st->codec.palctrl->palette[k] = b + (g << 8) + (r << 16);
617 }
618 st->codec.palctrl->palette_changed = 1;
4a8d5135 619 goto resync;
69bde0b2
MM
620 }
621
df99755b 622 }
d2c5f0a4 623
df99755b 624 return -1;
de6d9b64
FB
625}
626
155e9ee9
FB
627/* XXX: we make the implicit supposition that the position are sorted
628 for each stream */
629static int avi_read_idx1(AVFormatContext *s, int size)
630{
7c7f3866 631 AVIContext *avi = s->priv_data;
155e9ee9
FB
632 ByteIOContext *pb = &s->pb;
633 int nb_index_entries, i;
634 AVStream *st;
635 AVIStream *ast;
155e9ee9 636 unsigned int index, tag, flags, pos, len;
7c7f3866 637 unsigned last_pos= -1;
155e9ee9
FB
638
639 nb_index_entries = size / 16;
640 if (nb_index_entries <= 0)
641 return -1;
642
643 /* read the entries and sort them in each stream component */
644 for(i = 0; i < nb_index_entries; i++) {
645 tag = get_le32(pb);
646 flags = get_le32(pb);
647 pos = get_le32(pb);
648 len = get_le32(pb);
52a0bbff
MN
649#if defined(DEBUG_SEEK)
650 av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
155e9ee9
FB
651 i, tag, flags, pos, len);
652#endif
7c7f3866
MN
653 if(i==0 && pos > avi->movi_list)
654 avi->movi_list= 0; //FIXME better check
655
155e9ee9
FB
656 index = ((tag & 0xff) - '0') * 10;
657 index += ((tag >> 8) & 0xff) - '0';
658 if (index >= s->nb_streams)
659 continue;
660 st = s->streams[index];
661 ast = st->priv_data;
662
52a0bbff
MN
663#if defined(DEBUG_SEEK)
664 av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%d\n", len, ast->cum_len);
665#endif
7c7f3866
MN
666 if(len)
667 av_add_index_entry(st, pos, ast->cum_len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
668 if(ast->sample_size)
669 ast->cum_len += len / ast->sample_size;
670 else
671 ast->cum_len ++;
672 if(last_pos == pos)
673 avi->non_interleaved= 1;
674 last_pos= pos;
155e9ee9
FB
675 }
676 return 0;
677}
678
7c7f3866
MN
679static int guess_ni_flag(AVFormatContext *s){
680 AVIContext *avi = s->priv_data;
681 int i;
682 int64_t last_start=0;
683 int64_t first_end= INT64_MAX;
684
685 for(i=0; i<s->nb_streams; i++){
686 AVStream *st = s->streams[i];
687 AVIStream *ast = st->priv_data;
688 int n= st->nb_index_entries;
689
690 if(n <= 0)
691 continue;
692
693 if(st->index_entries[0].pos > last_start)
694 last_start= st->index_entries[0].pos;
695 if(st->index_entries[n-1].pos < first_end)
696 first_end= st->index_entries[n-1].pos;
697 }
698 return last_start > first_end;
699}
700
155e9ee9
FB
701static int avi_load_index(AVFormatContext *s)
702{
703 AVIContext *avi = s->priv_data;
704 ByteIOContext *pb = &s->pb;
705 uint32_t tag, size;
e6c0297f
MN
706 offset_t pos= url_ftell(pb);
707
155e9ee9
FB
708 url_fseek(pb, avi->movi_end, SEEK_SET);
709#ifdef DEBUG_SEEK
710 printf("movi_end=0x%llx\n", avi->movi_end);
711#endif
712 for(;;) {
713 if (url_feof(pb))
714 break;
715 tag = get_le32(pb);
716 size = get_le32(pb);
717#ifdef DEBUG_SEEK
718 printf("tag=%c%c%c%c size=0x%x\n",
719 tag & 0xff,
720 (tag >> 8) & 0xff,
721 (tag >> 16) & 0xff,
722 (tag >> 24) & 0xff,
723 size);
724#endif
725 switch(tag) {
726 case MKTAG('i', 'd', 'x', '1'):
727 if (avi_read_idx1(s, size) < 0)
728 goto skip;
729 else
730 goto the_end;
731 break;
732 default:
733 skip:
734 size += (size & 1);
735 url_fskip(pb, size);
736 break;
737 }
738 }
739 the_end:
7c7f3866 740 avi->non_interleaved |= guess_ni_flag(s);
e6c0297f 741 url_fseek(pb, pos, SEEK_SET);
155e9ee9
FB
742 return 0;
743}
744
7b3c1382 745static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
155e9ee9
FB
746{
747 AVIContext *avi = s->priv_data;
748 AVStream *st;
52a0bbff 749 int i, index;
155e9ee9
FB
750 int64_t pos;
751
752 if (!avi->index_loaded) {
753 /* we only load the index on demand */
754 avi_load_index(s);
755 avi->index_loaded = 1;
756 }
52a0bbff 757 assert(stream_index>= 0);
155e9ee9
FB
758
759 st = s->streams[stream_index];
52a0bbff
MN
760 index= av_index_search_timestamp(st, timestamp, flags);
761 if(index<0)
155e9ee9 762 return -1;
52a0bbff 763
155e9ee9 764 /* find the position */
52a0bbff
MN
765 pos = st->index_entries[index].pos;
766 timestamp = st->index_entries[index].timestamp;
767
768// av_log(NULL, AV_LOG_DEBUG, "XX %Ld %d %Ld\n", timestamp, index, st->index_entries[index].timestamp);
155e9ee9 769
155e9ee9 770 for(i = 0; i < s->nb_streams; i++) {
52a0bbff
MN
771 AVStream *st2 = s->streams[i];
772 AVIStream *ast2 = st2->priv_data;
7c7f3866
MN
773
774 ast2->packet_size=
775 ast2->remaining= 0;
776
52a0bbff
MN
777 if (st2->nb_index_entries <= 0)
778 continue;
779
780// assert(st2->codec.block_align);
781 assert(st2->time_base.den == ast2->rate);
782 assert(st2->time_base.num == ast2->scale);
783 index = av_index_search_timestamp(
784 st2,
785 av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
786 flags | AVSEEK_FLAG_BACKWARD);
787 if(index<0)
788 index=0;
7c7f3866
MN
789
790 if(!avi->non_interleaved){
791 while(index>0 && st2->index_entries[index].pos > pos)
792 index--;
793 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
794 index++;
795 }
796
52a0bbff
MN
797// av_log(NULL, AV_LOG_DEBUG, "%Ld %d %Ld\n", timestamp, index, st2->index_entries[index].timestamp);
798 /* extract the current frame number */
799 ast2->frame_offset = st2->index_entries[index].timestamp;
800 if(ast2->sample_size)
801 ast2->frame_offset *=ast2->sample_size;
155e9ee9 802 }
52a0bbff 803
664f5836
RS
804 if (avi->dv_demux)
805 dv_flush_audio_packets(avi->dv_demux);
155e9ee9
FB
806 /* do the seek */
807 pos += avi->movi_list;
808 url_fseek(&s->pb, pos, SEEK_SET);
7c7f3866 809 avi->stream_index= -1;
155e9ee9
FB
810 return 0;
811}
812
1101abfe 813static int avi_read_close(AVFormatContext *s)
de6d9b64 814{
5ae2c73e
MN
815 int i;
816 AVIContext *avi = s->priv_data;
5ae2c73e
MN
817
818 for(i=0;i<s->nb_streams;i++) {
819 AVStream *st = s->streams[i];
155e9ee9 820 AVIStream *ast = st->priv_data;
52a0bbff 821 av_free(ast);
5ae2c73e 822 av_free(st->codec.extradata);
5e29abf8 823 av_free(st->codec.palctrl);
5ae2c73e
MN
824 }
825
7458ccbb
RS
826 if (avi->dv_demux)
827 av_free(avi->dv_demux);
828
c9a65ca8
FB
829 return 0;
830}
831
832static int avi_probe(AVProbeData *p)
833{
834 /* check file header */
835 if (p->buf_size <= 32)
836 return 0;
837 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
838 p->buf[2] == 'F' && p->buf[3] == 'F' &&
839 p->buf[8] == 'A' && p->buf[9] == 'V' &&
840 p->buf[10] == 'I' && p->buf[11] == ' ')
841 return AVPROBE_SCORE_MAX;
842 else
843 return 0;
844}
845
846static AVInputFormat avi_iformat = {
847 "avi",
848 "avi format",
849 sizeof(AVIContext),
850 avi_probe,
851 avi_read_header,
852 avi_read_packet,
853 avi_read_close,
155e9ee9 854 avi_read_seek,
c9a65ca8
FB
855};
856
857int avidec_init(void)
858{
859 av_register_input_format(&avi_iformat);
de6d9b64
FB
860 return 0;
861}