dont load the index if we cant seek back
[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
5509bffa 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 35 int scale;
115329f1 36 int rate;
8223bca5 37 int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
115329f1 38
94d1d6c0 39 int64_t cum_len; /* temporary storage (used during seek) */
115329f1 40
d2c5f0a4
MN
41 int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
42 int prefix_count;
155e9ee9 43} AVIStream;
de6d9b64
FB
44
45typedef struct {
7458ccbb
RS
46 int64_t riff_end;
47 int64_t movi_end;
de6d9b64 48 offset_t movi_list;
155e9ee9 49 int index_loaded;
8f9298f8 50 int is_odml;
7c7f3866
MN
51 int non_interleaved;
52 int stream_index;
ddaae6a9 53 DVDemuxContext* dv_demux;
de6d9b64
FB
54} AVIContext;
55
42feef6b 56static int avi_load_index(AVFormatContext *s);
30a43f2d 57static int guess_ni_flag(AVFormatContext *s);
42feef6b 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{
115329f1 73 uint32_t tag;
06219cb1
RS
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;
115329f1 84
06219cb1
RS
85 return 0;
86}
87
94d1d6c0 88static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
8945ebb9 89 AVIContext *avi = s->priv_data;
94d1d6c0
MN
90 ByteIOContext *pb = &s->pb;
91 int longs_pre_entry= get_le16(pb);
92 int index_sub_type = get_byte(pb);
93 int index_type = get_byte(pb);
94 int entries_in_use = get_le32(pb);
95 int chunk_id = get_le32(pb);
96 int64_t base = get_le64(pb);
97 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
98 AVStream *st;
99 AVIStream *ast;
100 int i;
8945ebb9 101 int64_t last_pos= -1;
94d1d6c0
MN
102
103// av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%Ld\n",
104// longs_pre_entry,index_type, entries_in_use, chunk_id, base);
105
106 if(stream_id > s->nb_streams || stream_id < 0)
107 return -1;
108 st= s->streams[stream_id];
109 ast = st->priv_data;
110
111 if(index_sub_type)
112 return -1;
113
114 get_le32(pb);
115
116 if(index_type && longs_pre_entry != 2)
117 return -1;
118 if(index_type>1)
119 return -1;
120
121 for(i=0; i<entries_in_use; i++){
122 if(index_type){
30a43f2d 123 int64_t pos= get_le32(pb) + base - 8;
94d1d6c0 124 int len = get_le32(pb);
30a43f2d 125 int key= len >= 0;
94d1d6c0
MN
126 len &= 0x7FFFFFFF;
127
30a43f2d 128//av_log(s, AV_LOG_ERROR, "pos:%Ld, len:%X\n", pos, len);
8945ebb9
MN
129 if(last_pos == pos || pos == base - 8)
130 avi->non_interleaved= 1;
131 else
132 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
30a43f2d 133
94d1d6c0
MN
134 if(ast->sample_size)
135 ast->cum_len += len / ast->sample_size;
136 else
137 ast->cum_len ++;
8945ebb9 138 last_pos= pos;
94d1d6c0
MN
139 }else{
140 int64_t offset= get_le64(pb);
141 int size = get_le32(pb);
142 int duration = get_le32(pb);
143 int64_t pos= url_ftell(pb);
144
145 url_fseek(pb, offset+8, SEEK_SET);
146 read_braindead_odml_indx(s, frame_num);
147 frame_num += duration;
148
149 url_fseek(pb, pos, SEEK_SET);
150 }
151 }
152 return 0;
153}
154
115e8ae5
MN
155static void clean_index(AVFormatContext *s){
156 int i, j;
157
158 for(i=0; i<s->nb_streams; i++){
159 AVStream *st = s->streams[i];
160 AVIStream *ast = st->priv_data;
161 int n= st->nb_index_entries;
162 int max= ast->sample_size;
163 int64_t pos, size, ts;
164
165 if(n != 1 || ast->sample_size==0)
166 continue;
167
168 while(max < 1024) max+=max;
169
170 pos= st->index_entries[0].pos;
171 size= st->index_entries[0].size;
172 ts= st->index_entries[0].timestamp;
173
174 for(j=0; j<size; j+=max){
175 av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
176 }
177 }
178}
179
1101abfe 180static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
de6d9b64 181{
c9a65ca8 182 AVIContext *avi = s->priv_data;
de6d9b64 183 ByteIOContext *pb = &s->pb;
deb0a292 184 uint32_t tag, tag1, handler;
b53f1064 185 int codec_type, stream_index, frame_period, bit_rate;
247eadca
FB
186 unsigned int size, nb_frames;
187 int i, n;
de6d9b64 188 AVStream *st;
155e9ee9 189 AVIStream *ast;
9e8cd0db 190 int xan_video = 0; /* hack to support Xan A/V */
de6d9b64 191
7c7f3866 192 avi->stream_index= -1;
115329f1 193
06219cb1 194 if (get_riff(avi, pb) < 0)
de6d9b64 195 return -1;
1101abfe 196
de6d9b64
FB
197 /* first list tag */
198 stream_index = -1;
199 codec_type = -1;
200 frame_period = 0;
201 for(;;) {
202 if (url_feof(pb))
203 goto fail;
204 tag = get_le32(pb);
205 size = get_le32(pb);
206#ifdef DEBUG
207 print_tag("tag", tag, size);
208#endif
209
210 switch(tag) {
211 case MKTAG('L', 'I', 'S', 'T'):
212 /* ignored, except when start of video packets */
213 tag1 = get_le32(pb);
214#ifdef DEBUG
215 print_tag("list", tag1, 0);
216#endif
217 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
155e9ee9 218 avi->movi_list = url_ftell(pb) - 4;
f8facaaf 219 if(size) avi->movi_end = avi->movi_list + size;
a965c478 220 else avi->movi_end = url_fsize(pb);
de6d9b64
FB
221#ifdef DEBUG
222 printf("movi end=%Lx\n", avi->movi_end);
223#endif
224 goto end_of_header;
225 }
226 break;
8f9298f8 227 case MKTAG('d', 'm', 'l', 'h'):
bb270c08
DB
228 avi->is_odml = 1;
229 url_fskip(pb, size + (size & 1));
230 break;
de6d9b64 231 case MKTAG('a', 'v', 'i', 'h'):
bb270c08 232 /* avi header */
1101abfe 233 /* using frame_period is bad idea */
de6d9b64
FB
234 frame_period = get_le32(pb);
235 bit_rate = get_le32(pb) * 8;
1894edeb
MN
236 get_le32(pb);
237 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
238
239 url_fskip(pb, 2 * 4);
247eadca
FB
240 n = get_le32(pb);
241 for(i=0;i<n;i++) {
155e9ee9 242 AVIStream *ast;
7458ccbb 243 st = av_new_stream(s, i);
de6d9b64
FB
244 if (!st)
245 goto fail;
9ee91c2f 246
155e9ee9
FB
247 ast = av_mallocz(sizeof(AVIStream));
248 if (!ast)
249 goto fail;
250 st->priv_data = ast;
bb270c08 251 }
de6d9b64
FB
252 url_fskip(pb, size - 7 * 4);
253 break;
254 case MKTAG('s', 't', 'r', 'h'):
255 /* stream header */
256 stream_index++;
257 tag1 = get_le32(pb);
7458ccbb 258 handler = get_le32(pb); /* codec tag */
cc11e2b3
MN
259#ifdef DEBUG
260 print_tag("strh", tag1, -1);
261#endif
b53f1064 262 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
115329f1 263 /*
bb270c08
DB
264 * After some consideration -- I don't think we
265 * have to support anything but DV in a type1 AVIs.
266 */
267 if (s->nb_streams != 1)
268 goto fail;
269
270 if (handler != MKTAG('d', 'v', 's', 'd') &&
271 handler != MKTAG('d', 'v', 'h', 'd') &&
272 handler != MKTAG('d', 'v', 's', 'l'))
273 goto fail;
274
275 ast = s->streams[0]->priv_data;
276 av_freep(&s->streams[0]->codec->extradata);
277 av_freep(&s->streams[0]);
278 s->nb_streams = 0;
279 avi->dv_demux = dv_init_demux(s);
280 if (!avi->dv_demux)
281 goto fail;
282 s->streams[0]->priv_data = ast;
283 url_fskip(pb, 3 * 4);
284 ast->scale = get_le32(pb);
285 ast->rate = get_le32(pb);
286 stream_index = s->nb_streams - 1;
287 url_fskip(pb, size - 7*4);
b53f1064
MN
288 break;
289 }
b559b29b 290
b53f1064
MN
291 if (stream_index >= s->nb_streams) {
292 url_fskip(pb, size - 8);
1c6606e2
KS
293 /* ignore padding stream */
294 if (tag1 == MKTAG('p', 'a', 'd', 's'))
295 stream_index--;
b53f1064 296 break;
115329f1 297 }
b53f1064
MN
298 st = s->streams[stream_index];
299 ast = st->priv_data;
01f4895c 300 st->codec->stream_codec_tag= handler;
b559b29b 301
b53f1064
MN
302 get_le32(pb); /* flags */
303 get_le16(pb); /* priority */
304 get_le16(pb); /* language */
305 get_le32(pb); /* initial frame */
306 ast->scale = get_le32(pb);
307 ast->rate = get_le32(pb);
308 if(ast->scale && ast->rate){
309 }else if(frame_period){
310 ast->rate = 1000000;
311 ast->scale = frame_period;
312 }else{
313 ast->rate = 25;
314 ast->scale = 1;
315 }
316 av_set_pts_info(st, 64, ast->scale, ast->rate);
115329f1 317
b72a2bc8 318 ast->cum_len=get_le32(pb); /* start */
b53f1064 319 nb_frames = get_le32(pb);
b559b29b 320
b53f1064 321 st->start_time = 0;
c0df9d75 322 st->duration = nb_frames;
b53f1064
MN
323 get_le32(pb); /* buffer size */
324 get_le32(pb); /* quality */
325 ast->sample_size = get_le32(pb); /* sample ssize */
326// av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
247eadca 327
b53f1064 328 switch(tag1) {
bb270c08 329 case MKTAG('v', 'i', 'd', 's'):
b53f1064 330 codec_type = CODEC_TYPE_VIDEO;
247eadca 331
b53f1064 332 ast->sample_size = 0;
b53f1064
MN
333 break;
334 case MKTAG('a', 'u', 'd', 's'):
335 codec_type = CODEC_TYPE_AUDIO;
9bf9a5fc 336 break;
cc11e2b3 337 case MKTAG('t', 'x', 't', 's'):
115329f1 338 //FIXME
cc11e2b3 339 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
cc11e2b3 340 break;
30667f42
MN
341 case MKTAG('p', 'a', 'd', 's'):
342 codec_type = CODEC_TYPE_UNKNOWN;
30667f42
MN
343 stream_index--;
344 break;
9bf9a5fc 345 default:
30667f42 346 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
9bf9a5fc 347 goto fail;
de6d9b64 348 }
b72a2bc8 349 ast->frame_offset= ast->cum_len * FFMAX(ast->sample_size, 1);
b53f1064 350 url_fskip(pb, size - 12 * 4);
de6d9b64
FB
351 break;
352 case MKTAG('s', 't', 'r', 'f'):
353 /* stream header */
7458ccbb 354 if (stream_index >= s->nb_streams || avi->dv_demux) {
de6d9b64
FB
355 url_fskip(pb, size);
356 } else {
357 st = s->streams[stream_index];
358 switch(codec_type) {
359 case CODEC_TYPE_VIDEO:
360 get_le32(pb); /* size */
01f4895c
MN
361 st->codec->width = get_le32(pb);
362 st->codec->height = get_le32(pb);
de6d9b64 363 get_le16(pb); /* panes */
01f4895c 364 st->codec->bits_per_sample= get_le16(pb); /* depth */
de6d9b64 365 tag1 = get_le32(pb);
b559b29b
MN
366 get_le32(pb); /* ImageSize */
367 get_le32(pb); /* XPelsPerMeter */
368 get_le32(pb); /* YPelsPerMeter */
369 get_le32(pb); /* ClrUsed */
370 get_le32(pb); /* ClrImportant */
371
568e18b1 372 if(size > 10*4 && size<(1<<30)){
01f4895c
MN
373 st->codec->extradata_size= size - 10*4;
374 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
375 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
568e18b1 376 }
115329f1 377
01f4895c 378 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
952c69c4 379 get_byte(pb);
b559b29b 380
5e29abf8
RT
381 /* Extract palette from extradata if bpp <= 8 */
382 /* This code assumes that extradata contains only palette */
383 /* This is true for all paletted codecs implemented in ffmpeg */
01f4895c
MN
384 if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
385 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
5e29abf8 386#ifdef WORDS_BIGENDIAN
01f4895c
MN
387 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
388 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
5e29abf8 389#else
01f4895c
MN
390 memcpy(st->codec->palctrl->palette, st->codec->extradata,
391 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
5e29abf8 392#endif
01f4895c 393 st->codec->palctrl->palette_changed = 1;
5e29abf8
RT
394 }
395
de6d9b64
FB
396#ifdef DEBUG
397 print_tag("video", tag1, 0);
398#endif
01f4895c
MN
399 st->codec->codec_type = CODEC_TYPE_VIDEO;
400 st->codec->codec_tag = tag1;
401 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
402 if (st->codec->codec_id == CODEC_ID_XAN_WC4)
9e8cd0db 403 xan_video = 1;
7cbaa7ba 404 st->need_parsing = 2; //only parse headers dont do slower repacketization, this is needed to get the pict type which is needed for generating correct pts
b559b29b 405// url_fskip(pb, size - 5 * 4);
de6d9b64 406 break;
9bf9a5fc 407 case CODEC_TYPE_AUDIO:
01f4895c 408 get_wav_header(pb, st->codec, size);
e84dab5f
MN
409 if(ast->sample_size && st->codec->block_align && ast->sample_size % st->codec->block_align)
410 av_log(s, AV_LOG_DEBUG, "invalid sample size or block align detected\n");
1cef9527
FR
411 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
412 url_fskip(pb, 1);
9e8cd0db
MM
413 /* special case time: To support Xan DPCM, hardcode
414 * the format if Xxan is the video codec */
155e9ee9
FB
415 st->need_parsing = 1;
416 /* force parsing as several audio frames can be in
417 one packet */
9e8cd0db 418 if (xan_video)
01f4895c 419 st->codec->codec_id = CODEC_ID_XAN_DPCM;
de6d9b64
FB
420 break;
421 default:
01f4895c
MN
422 st->codec->codec_type = CODEC_TYPE_DATA;
423 st->codec->codec_id= CODEC_ID_NONE;
424 st->codec->codec_tag= 0;
de6d9b64
FB
425 url_fskip(pb, size);
426 break;
427 }
428 }
429 break;
94d1d6c0
MN
430 case MKTAG('i', 'n', 'd', 'x'):
431 i= url_ftell(pb);
b7b22558
MN
432 if(!url_is_streamed(pb)){
433 read_braindead_odml_indx(s, 0);
434 avi->index_loaded=1;
435 }
94d1d6c0
MN
436 url_fseek(pb, i+size, SEEK_SET);
437 break;
de6d9b64
FB
438 default:
439 /* skip tag */
440 size += (size & 1);
441 url_fskip(pb, size);
442 break;
443 }
444 }
445 end_of_header:
446 /* check stream number */
447 if (stream_index != s->nb_streams - 1) {
448 fail:
449 for(i=0;i<s->nb_streams;i++) {
01f4895c 450 av_freep(&s->streams[i]->codec->extradata);
9145f8b3 451 av_freep(&s->streams[i]);
de6d9b64
FB
452 }
453 return -1;
454 }
1101abfe 455
b7b22558 456 if(!avi->index_loaded && !url_is_streamed(pb))
94d1d6c0 457 avi_load_index(s);
42feef6b 458 avi->index_loaded = 1;
30a43f2d 459 avi->non_interleaved |= guess_ni_flag(s);
115e8ae5
MN
460 if(avi->non_interleaved)
461 clean_index(s);
115329f1 462
de6d9b64
FB
463 return 0;
464}
465
1101abfe 466static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
de6d9b64
FB
467{
468 AVIContext *avi = s->priv_data;
469 ByteIOContext *pb = &s->pb;
8f9298f8 470 int n, d[8], size;
4a8d5135 471 offset_t i, sync;
7458ccbb 472 void* dstr;
115329f1 473
7458ccbb
RS
474 if (avi->dv_demux) {
475 size = dv_get_packet(avi->dv_demux, pkt);
bb270c08
DB
476 if (size >= 0)
477 return size;
2af7e610 478 }
115329f1 479
7c7f3866 480 if(avi->non_interleaved){
79396ac6 481 int best_stream_index = 0;
7c7f3866
MN
482 AVStream *best_st= NULL;
483 AVIStream *best_ast;
484 int64_t best_ts= INT64_MAX;
485 int i;
115329f1 486
7c7f3866
MN
487 for(i=0; i<s->nb_streams; i++){
488 AVStream *st = s->streams[i];
489 AVIStream *ast = st->priv_data;
490 int64_t ts= ast->frame_offset;
491
492 if(ast->sample_size)
493 ts /= ast->sample_size;
494 ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
495
496// av_log(NULL, AV_LOG_DEBUG, "%Ld %d/%d %Ld\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
497 if(ts < best_ts){
498 best_ts= ts;
499 best_st= st;
500 best_stream_index= i;
501 }
502 }
503 best_ast = best_st->priv_data;
504 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
505 if(best_ast->remaining)
506 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
507 else
508 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
509
510// av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
511 if(i>=0){
512 int64_t pos= best_st->index_entries[i].pos;
5c89153e 513 pos += best_ast->packet_size - best_ast->remaining;
1894edeb 514 url_fseek(&s->pb, pos + 8, SEEK_SET);
7c7f3866 515// av_log(NULL, AV_LOG_DEBUG, "pos=%Ld\n", pos);
115329f1 516
8223bca5
MN
517 assert(best_ast->remaining <= best_ast->packet_size);
518
1894edeb
MN
519 avi->stream_index= best_stream_index;
520 if(!best_ast->remaining)
8223bca5 521 best_ast->packet_size=
1894edeb 522 best_ast->remaining= best_st->index_entries[i].size;
7c7f3866
MN
523 }
524 }
115329f1 525
4a8d5135 526resync:
7c7f3866
MN
527 if(avi->stream_index >= 0){
528 AVStream *st= s->streams[ avi->stream_index ];
529 AVIStream *ast= st->priv_data;
530 int size;
115329f1 531
e84dab5f 532 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
7c7f3866 533 size= INT_MAX;
115329f1 534 else if(ast->sample_size < 32)
7c7f3866
MN
535 size= 64*ast->sample_size;
536 else
537 size= ast->sample_size;
538
539 if(size > ast->remaining)
540 size= ast->remaining;
2692067a 541 av_get_packet(pb, pkt, size);
115329f1 542
7c7f3866
MN
543 if (avi->dv_demux) {
544 dstr = pkt->destruct;
545 size = dv_produce_packet(avi->dv_demux, pkt,
546 pkt->data, pkt->size);
547 pkt->destruct = dstr;
548 pkt->flags |= PKT_FLAG_KEY;
549 } else {
550 /* XXX: how to handle B frames in avi ? */
551 pkt->dts = ast->frame_offset;
552// pkt->dts += ast->start;
553 if(ast->sample_size)
554 pkt->dts /= ast->sample_size;
8223bca5 555//av_log(NULL, AV_LOG_DEBUG, "dts:%Ld offset:%Ld %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);
7c7f3866
MN
556 pkt->stream_index = avi->stream_index;
557
01f4895c 558 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
7c7f3866
MN
559 if(st->index_entries){
560 AVIndexEntry *e;
561 int index;
562
563 index= av_index_search_timestamp(st, pkt->dts, 0);
564 e= &st->index_entries[index];
115329f1 565
d46db490 566 if(index >= 0 && e->timestamp == ast->frame_offset){
7c7f3866
MN
567 if (e->flags & AVINDEX_KEYFRAME)
568 pkt->flags |= PKT_FLAG_KEY;
569 }
570 } else {
571 /* if no index, better to say that all frames
572 are key frames */
573 pkt->flags |= PKT_FLAG_KEY;
574 }
575 } else {
115329f1 576 pkt->flags |= PKT_FLAG_KEY;
7c7f3866
MN
577 }
578 if(ast->sample_size)
579 ast->frame_offset += pkt->size;
580 else
581 ast->frame_offset++;
582 }
583 ast->remaining -= size;
584 if(!ast->remaining){
585 avi->stream_index= -1;
586 ast->packet_size= 0;
587 if (size & 1) {
588 get_byte(pb);
589 size++;
590 }
591 }
592
593 return size;
594 }
595
4a8d5135
MN
596 memset(d, -1, sizeof(int)*8);
597 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
df99755b 598 int j;
1101abfe 599
bb270c08
DB
600 if (i >= avi->movi_end) {
601 if (avi->is_odml) {
602 url_fskip(pb, avi->riff_end - i);
603 avi->riff_end = avi->movi_end = url_fsize(pb);
604 } else
605 break;
606 }
06219cb1 607
df99755b
MN
608 for(j=0; j<7; j++)
609 d[j]= d[j+1];
610 d[7]= get_byte(pb);
115329f1 611
df99755b 612 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
115329f1 613
df99755b 614 if( d[2] >= '0' && d[2] <= '9'
d2c5f0a4
MN
615 && d[3] >= '0' && d[3] <= '9'){
616 n= (d[2] - '0') * 10 + (d[3] - '0');
617 }else{
618 n= 100; //invalid stream id
df99755b 619 }
d2c5f0a4
MN
620//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);
621 if(i + size > avi->movi_end || d[0]<0)
622 continue;
115329f1 623
d2c5f0a4
MN
624 //parse ix##
625 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
bb270c08 626 //parse JUNK
d2c5f0a4 627 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')){
8f9298f8 628 url_fskip(pb, size);
d2c5f0a4 629//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
4a8d5135 630 goto resync;
8f9298f8 631 }
d2c5f0a4 632
df99755b 633 if( d[0] >= '0' && d[0] <= '9'
d2c5f0a4
MN
634 && d[1] >= '0' && d[1] <= '9'){
635 n= (d[0] - '0') * 10 + (d[1] - '0');
636 }else{
637 n= 100; //invalid stream id
638 }
115329f1 639
d2c5f0a4 640 //parse ##dc/##wb
80e3a08c 641 if(n < s->nb_streams){
d2c5f0a4
MN
642 AVStream *st;
643 AVIStream *ast;
644 st = s->streams[n];
645 ast = st->priv_data;
115329f1 646
f3356e9c
MN
647 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
648 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
649 || st->discard >= AVDISCARD_ALL){
650 if(ast->sample_size) ast->frame_offset += pkt->size;
651 else ast->frame_offset++;
b4aea108
MN
652 url_fskip(pb, size);
653 goto resync;
654 }
d2c5f0a4 655
115329f1 656 if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
d2c5f0a4 657 d[2]*256+d[3] == ast->prefix /*||
115329f1 658 (d[2] == 'd' && d[3] == 'c') ||
bb270c08 659 (d[2] == 'w' && d[3] == 'b')*/) {
d2c5f0a4
MN
660
661//av_log(NULL, AV_LOG_DEBUG, "OK\n");
662 if(d[2]*256+d[3] == ast->prefix)
663 ast->prefix_count++;
664 else{
665 ast->prefix= d[2]*256+d[3];
666 ast->prefix_count= 0;
667 }
668
7c7f3866
MN
669 avi->stream_index= n;
670 ast->packet_size= size + 8;
671 ast->remaining= size;
672 goto resync;
d2c5f0a4 673 }
df99755b 674 }
69bde0b2
MM
675 /* palette changed chunk */
676 if ( d[0] >= '0' && d[0] <= '9'
677 && d[1] >= '0' && d[1] <= '9'
678 && ((d[2] == 'p' && d[3] == 'c'))
679 && n < s->nb_streams && i + size <= avi->movi_end) {
680
681 AVStream *st;
682 int first, clr, flags, k, p;
683
684 st = s->streams[n];
685
686 first = get_byte(pb);
687 clr = get_byte(pb);
bb270c08
DB
688 if(!clr) /* all 256 colors used */
689 clr = 256;
69bde0b2
MM
690 flags = get_le16(pb);
691 p = 4;
692 for (k = first; k < clr + first; k++) {
693 int r, g, b;
694 r = get_byte(pb);
695 g = get_byte(pb);
696 b = get_byte(pb);
697 get_byte(pb);
01f4895c 698 st->codec->palctrl->palette[k] = b + (g << 8) + (r << 16);
69bde0b2 699 }
01f4895c 700 st->codec->palctrl->palette_changed = 1;
4a8d5135 701 goto resync;
69bde0b2
MM
702 }
703
df99755b 704 }
d2c5f0a4 705
df99755b 706 return -1;
de6d9b64
FB
707}
708
155e9ee9
FB
709/* XXX: we make the implicit supposition that the position are sorted
710 for each stream */
711static int avi_read_idx1(AVFormatContext *s, int size)
712{
7c7f3866 713 AVIContext *avi = s->priv_data;
155e9ee9
FB
714 ByteIOContext *pb = &s->pb;
715 int nb_index_entries, i;
716 AVStream *st;
717 AVIStream *ast;
155e9ee9 718 unsigned int index, tag, flags, pos, len;
7c7f3866 719 unsigned last_pos= -1;
115329f1 720
155e9ee9
FB
721 nb_index_entries = size / 16;
722 if (nb_index_entries <= 0)
723 return -1;
724
725 /* read the entries and sort them in each stream component */
726 for(i = 0; i < nb_index_entries; i++) {
727 tag = get_le32(pb);
728 flags = get_le32(pb);
729 pos = get_le32(pb);
730 len = get_le32(pb);
52a0bbff 731#if defined(DEBUG_SEEK)
115329f1 732 av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
155e9ee9
FB
733 i, tag, flags, pos, len);
734#endif
7c7f3866
MN
735 if(i==0 && pos > avi->movi_list)
736 avi->movi_list= 0; //FIXME better check
5c89153e 737 pos += avi->movi_list;
7c7f3866 738
155e9ee9
FB
739 index = ((tag & 0xff) - '0') * 10;
740 index += ((tag >> 8) & 0xff) - '0';
741 if (index >= s->nb_streams)
742 continue;
743 st = s->streams[index];
744 ast = st->priv_data;
115329f1 745
52a0bbff
MN
746#if defined(DEBUG_SEEK)
747 av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%d\n", len, ast->cum_len);
748#endif
80e3a08c
MN
749 if(last_pos == pos)
750 avi->non_interleaved= 1;
751 else
30a43f2d 752 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
7c7f3866
MN
753 if(ast->sample_size)
754 ast->cum_len += len / ast->sample_size;
755 else
756 ast->cum_len ++;
7c7f3866 757 last_pos= pos;
155e9ee9
FB
758 }
759 return 0;
760}
761
7c7f3866 762static int guess_ni_flag(AVFormatContext *s){
7c7f3866
MN
763 int i;
764 int64_t last_start=0;
765 int64_t first_end= INT64_MAX;
115329f1 766
7c7f3866
MN
767 for(i=0; i<s->nb_streams; i++){
768 AVStream *st = s->streams[i];
7c7f3866
MN
769 int n= st->nb_index_entries;
770
771 if(n <= 0)
772 continue;
773
774 if(st->index_entries[0].pos > last_start)
775 last_start= st->index_entries[0].pos;
776 if(st->index_entries[n-1].pos < first_end)
777 first_end= st->index_entries[n-1].pos;
778 }
779 return last_start > first_end;
780}
781
155e9ee9
FB
782static int avi_load_index(AVFormatContext *s)
783{
784 AVIContext *avi = s->priv_data;
785 ByteIOContext *pb = &s->pb;
786 uint32_t tag, size;
e6c0297f 787 offset_t pos= url_ftell(pb);
115329f1 788
155e9ee9
FB
789 url_fseek(pb, avi->movi_end, SEEK_SET);
790#ifdef DEBUG_SEEK
791 printf("movi_end=0x%llx\n", avi->movi_end);
792#endif
793 for(;;) {
794 if (url_feof(pb))
795 break;
796 tag = get_le32(pb);
797 size = get_le32(pb);
798#ifdef DEBUG_SEEK
799 printf("tag=%c%c%c%c size=0x%x\n",
800 tag & 0xff,
801 (tag >> 8) & 0xff,
802 (tag >> 16) & 0xff,
803 (tag >> 24) & 0xff,
804 size);
805#endif
806 switch(tag) {
807 case MKTAG('i', 'd', 'x', '1'):
808 if (avi_read_idx1(s, size) < 0)
809 goto skip;
810 else
811 goto the_end;
812 break;
813 default:
814 skip:
815 size += (size & 1);
816 url_fskip(pb, size);
817 break;
818 }
819 }
820 the_end:
e6c0297f 821 url_fseek(pb, pos, SEEK_SET);
155e9ee9
FB
822 return 0;
823}
824
7b3c1382 825static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
155e9ee9
FB
826{
827 AVIContext *avi = s->priv_data;
828 AVStream *st;
52a0bbff 829 int i, index;
155e9ee9
FB
830 int64_t pos;
831
832 if (!avi->index_loaded) {
833 /* we only load the index on demand */
834 avi_load_index(s);
835 avi->index_loaded = 1;
836 }
52a0bbff 837 assert(stream_index>= 0);
155e9ee9
FB
838
839 st = s->streams[stream_index];
52a0bbff
MN
840 index= av_index_search_timestamp(st, timestamp, flags);
841 if(index<0)
155e9ee9 842 return -1;
115329f1 843
155e9ee9 844 /* find the position */
52a0bbff
MN
845 pos = st->index_entries[index].pos;
846 timestamp = st->index_entries[index].timestamp;
847
848// av_log(NULL, AV_LOG_DEBUG, "XX %Ld %d %Ld\n", timestamp, index, st->index_entries[index].timestamp);
155e9ee9 849
155e9ee9 850 for(i = 0; i < s->nb_streams; i++) {
52a0bbff
MN
851 AVStream *st2 = s->streams[i];
852 AVIStream *ast2 = st2->priv_data;
7c7f3866
MN
853
854 ast2->packet_size=
855 ast2->remaining= 0;
856
52a0bbff
MN
857 if (st2->nb_index_entries <= 0)
858 continue;
115329f1 859
e84dab5f 860// assert(st2->codec->block_align);
52a0bbff
MN
861 assert(st2->time_base.den == ast2->rate);
862 assert(st2->time_base.num == ast2->scale);
863 index = av_index_search_timestamp(
115329f1 864 st2,
52a0bbff
MN
865 av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
866 flags | AVSEEK_FLAG_BACKWARD);
867 if(index<0)
868 index=0;
115329f1 869
7c7f3866
MN
870 if(!avi->non_interleaved){
871 while(index>0 && st2->index_entries[index].pos > pos)
872 index--;
873 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
874 index++;
875 }
876
52a0bbff
MN
877// av_log(NULL, AV_LOG_DEBUG, "%Ld %d %Ld\n", timestamp, index, st2->index_entries[index].timestamp);
878 /* extract the current frame number */
879 ast2->frame_offset = st2->index_entries[index].timestamp;
880 if(ast2->sample_size)
881 ast2->frame_offset *=ast2->sample_size;
155e9ee9 882 }
52a0bbff 883
664f5836
RS
884 if (avi->dv_demux)
885 dv_flush_audio_packets(avi->dv_demux);
155e9ee9 886 /* do the seek */
155e9ee9 887 url_fseek(&s->pb, pos, SEEK_SET);
7c7f3866 888 avi->stream_index= -1;
155e9ee9
FB
889 return 0;
890}
891
1101abfe 892static int avi_read_close(AVFormatContext *s)
de6d9b64 893{
5ae2c73e
MN
894 int i;
895 AVIContext *avi = s->priv_data;
5ae2c73e
MN
896
897 for(i=0;i<s->nb_streams;i++) {
898 AVStream *st = s->streams[i];
155e9ee9 899 AVIStream *ast = st->priv_data;
52a0bbff 900 av_free(ast);
01f4895c
MN
901 av_free(st->codec->extradata);
902 av_free(st->codec->palctrl);
5ae2c73e
MN
903 }
904
7458ccbb
RS
905 if (avi->dv_demux)
906 av_free(avi->dv_demux);
907
c9a65ca8
FB
908 return 0;
909}
910
911static int avi_probe(AVProbeData *p)
912{
913 /* check file header */
914 if (p->buf_size <= 32)
915 return 0;
916 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
917 p->buf[2] == 'F' && p->buf[3] == 'F' &&
918 p->buf[8] == 'A' && p->buf[9] == 'V' &&
919 p->buf[10] == 'I' && p->buf[11] == ' ')
920 return AVPROBE_SCORE_MAX;
921 else
922 return 0;
923}
924
925static AVInputFormat avi_iformat = {
926 "avi",
927 "avi format",
928 sizeof(AVIContext),
929 avi_probe,
930 avi_read_header,
931 avi_read_packet,
932 avi_read_close,
155e9ee9 933 avi_read_seek,
c9a65ca8
FB
934};
935
936int avidec_init(void)
937{
938 av_register_input_format(&avi_iformat);
de6d9b64
FB
939 return 0;
940}