replace if by assert as it should never by true
[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;
155e9ee9 37 int sample_size; /* audio only data */
1fa3d65d 38 int start;
115329f1 39
155e9ee9 40 int cum_len; /* temporary storage (used during seek) */
115329f1 41
d2c5f0a4
MN
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{
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
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;
b53f1064 93 int codec_type, stream_index, frame_period, bit_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 100 avi->stream_index= -1;
115329f1 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 127 if(size) avi->movi_end = avi->movi_list + size;
a965c478 128 else avi->movi_end = url_fsize(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 135 case MKTAG('d', 'm', 'l', 'h'):
bb270c08
DB
136 avi->is_odml = 1;
137 url_fskip(pb, size + (size & 1));
138 break;
de6d9b64 139 case MKTAG('a', 'v', 'i', 'h'):
bb270c08 140 /* avi header */
1101abfe 141 /* using frame_period is bad idea */
de6d9b64
FB
142 frame_period = get_le32(pb);
143 bit_rate = get_le32(pb) * 8;
bb270c08 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;
bb270c08 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
b53f1064 167 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
115329f1 168 /*
bb270c08
DB
169 * After some consideration -- I don't think we
170 * have to support anything but DV in a type1 AVIs.
171 */
172 if (s->nb_streams != 1)
173 goto fail;
174
175 if (handler != MKTAG('d', 'v', 's', 'd') &&
176 handler != MKTAG('d', 'v', 'h', 'd') &&
177 handler != MKTAG('d', 'v', 's', 'l'))
178 goto fail;
179
180 ast = s->streams[0]->priv_data;
181 av_freep(&s->streams[0]->codec->extradata);
182 av_freep(&s->streams[0]);
183 s->nb_streams = 0;
184 avi->dv_demux = dv_init_demux(s);
185 if (!avi->dv_demux)
186 goto fail;
187 s->streams[0]->priv_data = ast;
188 url_fskip(pb, 3 * 4);
189 ast->scale = get_le32(pb);
190 ast->rate = get_le32(pb);
191 stream_index = s->nb_streams - 1;
192 url_fskip(pb, size - 7*4);
b53f1064
MN
193 break;
194 }
b559b29b 195
b53f1064
MN
196 if (stream_index >= s->nb_streams) {
197 url_fskip(pb, size - 8);
198 break;
115329f1 199 }
b53f1064
MN
200 st = s->streams[stream_index];
201 ast = st->priv_data;
01f4895c 202 st->codec->stream_codec_tag= handler;
b559b29b 203
b53f1064
MN
204 get_le32(pb); /* flags */
205 get_le16(pb); /* priority */
206 get_le16(pb); /* language */
207 get_le32(pb); /* initial frame */
208 ast->scale = get_le32(pb);
209 ast->rate = get_le32(pb);
210 if(ast->scale && ast->rate){
211 }else if(frame_period){
212 ast->rate = 1000000;
213 ast->scale = frame_period;
214 }else{
215 ast->rate = 25;
216 ast->scale = 1;
217 }
218 av_set_pts_info(st, 64, ast->scale, ast->rate);
115329f1 219
b53f1064
MN
220 ast->start= get_le32(pb); /* start */
221 nb_frames = get_le32(pb);
b559b29b 222
b53f1064 223 st->start_time = 0;
c0df9d75 224 st->duration = nb_frames;
b53f1064
MN
225 get_le32(pb); /* buffer size */
226 get_le32(pb); /* quality */
227 ast->sample_size = get_le32(pb); /* sample ssize */
228// av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
247eadca 229
b53f1064 230 switch(tag1) {
bb270c08 231 case MKTAG('v', 'i', 'd', 's'):
b53f1064 232 codec_type = CODEC_TYPE_VIDEO;
247eadca 233
b53f1064 234 ast->sample_size = 0;
b53f1064
MN
235 break;
236 case MKTAG('a', 'u', 'd', 's'):
237 codec_type = CODEC_TYPE_AUDIO;
9bf9a5fc 238 break;
cc11e2b3 239 case MKTAG('t', 'x', 't', 's'):
115329f1 240 //FIXME
cc11e2b3 241 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
cc11e2b3 242 break;
30667f42
MN
243 case MKTAG('p', 'a', 'd', 's'):
244 codec_type = CODEC_TYPE_UNKNOWN;
30667f42
MN
245 stream_index--;
246 break;
9bf9a5fc 247 default:
30667f42 248 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
9bf9a5fc 249 goto fail;
de6d9b64 250 }
b53f1064 251 url_fskip(pb, size - 12 * 4);
de6d9b64
FB
252 break;
253 case MKTAG('s', 't', 'r', 'f'):
254 /* stream header */
7458ccbb 255 if (stream_index >= s->nb_streams || avi->dv_demux) {
de6d9b64
FB
256 url_fskip(pb, size);
257 } else {
258 st = s->streams[stream_index];
259 switch(codec_type) {
260 case CODEC_TYPE_VIDEO:
261 get_le32(pb); /* size */
01f4895c
MN
262 st->codec->width = get_le32(pb);
263 st->codec->height = get_le32(pb);
de6d9b64 264 get_le16(pb); /* panes */
01f4895c 265 st->codec->bits_per_sample= get_le16(pb); /* depth */
de6d9b64 266 tag1 = get_le32(pb);
b559b29b
MN
267 get_le32(pb); /* ImageSize */
268 get_le32(pb); /* XPelsPerMeter */
269 get_le32(pb); /* YPelsPerMeter */
270 get_le32(pb); /* ClrUsed */
271 get_le32(pb); /* ClrImportant */
272
568e18b1 273 if(size > 10*4 && size<(1<<30)){
01f4895c
MN
274 st->codec->extradata_size= size - 10*4;
275 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
276 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
568e18b1 277 }
115329f1 278
01f4895c 279 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
952c69c4 280 get_byte(pb);
b559b29b 281
5e29abf8
RT
282 /* Extract palette from extradata if bpp <= 8 */
283 /* This code assumes that extradata contains only palette */
284 /* This is true for all paletted codecs implemented in ffmpeg */
01f4895c
MN
285 if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
286 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
5e29abf8 287#ifdef WORDS_BIGENDIAN
01f4895c
MN
288 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
289 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
5e29abf8 290#else
01f4895c
MN
291 memcpy(st->codec->palctrl->palette, st->codec->extradata,
292 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
5e29abf8 293#endif
01f4895c 294 st->codec->palctrl->palette_changed = 1;
5e29abf8
RT
295 }
296
de6d9b64
FB
297#ifdef DEBUG
298 print_tag("video", tag1, 0);
299#endif
01f4895c
MN
300 st->codec->codec_type = CODEC_TYPE_VIDEO;
301 st->codec->codec_tag = tag1;
302 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
303 if (st->codec->codec_id == CODEC_ID_XAN_WC4)
9e8cd0db 304 xan_video = 1;
7cbaa7ba 305 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 306// url_fskip(pb, size - 5 * 4);
de6d9b64 307 break;
9bf9a5fc 308 case CODEC_TYPE_AUDIO:
01f4895c 309 get_wav_header(pb, st->codec, size);
1cef9527
FR
310 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
311 url_fskip(pb, 1);
9e8cd0db
MM
312 /* special case time: To support Xan DPCM, hardcode
313 * the format if Xxan is the video codec */
155e9ee9
FB
314 st->need_parsing = 1;
315 /* force parsing as several audio frames can be in
316 one packet */
9e8cd0db 317 if (xan_video)
01f4895c 318 st->codec->codec_id = CODEC_ID_XAN_DPCM;
de6d9b64
FB
319 break;
320 default:
01f4895c
MN
321 st->codec->codec_type = CODEC_TYPE_DATA;
322 st->codec->codec_id= CODEC_ID_NONE;
323 st->codec->codec_tag= 0;
de6d9b64
FB
324 url_fskip(pb, size);
325 break;
326 }
327 }
328 break;
329 default:
330 /* skip tag */
331 size += (size & 1);
332 url_fskip(pb, size);
333 break;
334 }
335 }
336 end_of_header:
337 /* check stream number */
338 if (stream_index != s->nb_streams - 1) {
339 fail:
340 for(i=0;i<s->nb_streams;i++) {
01f4895c 341 av_freep(&s->streams[i]->codec->extradata);
9145f8b3 342 av_freep(&s->streams[i]);
de6d9b64
FB
343 }
344 return -1;
345 }
1101abfe 346
42feef6b
MN
347 assert(!avi->index_loaded);
348 avi_load_index(s);
349 avi->index_loaded = 1;
115329f1 350
de6d9b64
FB
351 return 0;
352}
353
1101abfe 354static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
de6d9b64
FB
355{
356 AVIContext *avi = s->priv_data;
357 ByteIOContext *pb = &s->pb;
8f9298f8 358 int n, d[8], size;
4a8d5135 359 offset_t i, sync;
7458ccbb 360 void* dstr;
115329f1 361
7458ccbb
RS
362 if (avi->dv_demux) {
363 size = dv_get_packet(avi->dv_demux, pkt);
bb270c08
DB
364 if (size >= 0)
365 return size;
2af7e610 366 }
115329f1 367
7c7f3866 368 if(avi->non_interleaved){
79396ac6 369 int best_stream_index = 0;
7c7f3866
MN
370 AVStream *best_st= NULL;
371 AVIStream *best_ast;
372 int64_t best_ts= INT64_MAX;
373 int i;
115329f1 374
7c7f3866
MN
375 for(i=0; i<s->nb_streams; i++){
376 AVStream *st = s->streams[i];
377 AVIStream *ast = st->priv_data;
378 int64_t ts= ast->frame_offset;
379
380 if(ast->sample_size)
381 ts /= ast->sample_size;
382 ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
383
384// av_log(NULL, AV_LOG_DEBUG, "%Ld %d/%d %Ld\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
385 if(ts < best_ts){
386 best_ts= ts;
387 best_st= st;
388 best_stream_index= i;
389 }
390 }
391 best_ast = best_st->priv_data;
392 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
393 if(best_ast->remaining)
394 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
395 else
396 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
397
398// av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
399 if(i>=0){
400 int64_t pos= best_st->index_entries[i].pos;
401 pos += avi->movi_list + best_ast->packet_size - best_ast->remaining;
402 url_fseek(&s->pb, pos, SEEK_SET);
403// av_log(NULL, AV_LOG_DEBUG, "pos=%Ld\n", pos);
115329f1 404
7c7f3866
MN
405 if(best_ast->remaining)
406 avi->stream_index= best_stream_index;
407 else
408 avi->stream_index= -1;
409 }
410 }
115329f1 411
4a8d5135 412resync:
7c7f3866
MN
413 if(avi->stream_index >= 0){
414 AVStream *st= s->streams[ avi->stream_index ];
415 AVIStream *ast= st->priv_data;
416 int size;
115329f1 417
7c7f3866
MN
418 if(ast->sample_size == 0)
419 size= INT_MAX;
115329f1 420 else if(ast->sample_size < 32)
7c7f3866
MN
421 size= 64*ast->sample_size;
422 else
423 size= ast->sample_size;
424
425 if(size > ast->remaining)
426 size= ast->remaining;
2692067a 427 av_get_packet(pb, pkt, size);
115329f1 428
7c7f3866
MN
429 if (avi->dv_demux) {
430 dstr = pkt->destruct;
431 size = dv_produce_packet(avi->dv_demux, pkt,
432 pkt->data, pkt->size);
433 pkt->destruct = dstr;
434 pkt->flags |= PKT_FLAG_KEY;
435 } else {
436 /* XXX: how to handle B frames in avi ? */
437 pkt->dts = ast->frame_offset;
438// pkt->dts += ast->start;
439 if(ast->sample_size)
440 pkt->dts /= ast->sample_size;
441//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);
442 pkt->stream_index = avi->stream_index;
443
01f4895c 444 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
7c7f3866
MN
445 if(st->index_entries){
446 AVIndexEntry *e;
447 int index;
448
449 index= av_index_search_timestamp(st, pkt->dts, 0);
450 e= &st->index_entries[index];
115329f1 451
d46db490 452 if(index >= 0 && e->timestamp == ast->frame_offset){
7c7f3866
MN
453 if (e->flags & AVINDEX_KEYFRAME)
454 pkt->flags |= PKT_FLAG_KEY;
455 }
456 } else {
457 /* if no index, better to say that all frames
458 are key frames */
459 pkt->flags |= PKT_FLAG_KEY;
460 }
461 } else {
115329f1 462 pkt->flags |= PKT_FLAG_KEY;
7c7f3866
MN
463 }
464 if(ast->sample_size)
465 ast->frame_offset += pkt->size;
466 else
467 ast->frame_offset++;
468 }
469 ast->remaining -= size;
470 if(!ast->remaining){
471 avi->stream_index= -1;
472 ast->packet_size= 0;
473 if (size & 1) {
474 get_byte(pb);
475 size++;
476 }
477 }
478
479 return size;
480 }
481
4a8d5135
MN
482 memset(d, -1, sizeof(int)*8);
483 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
df99755b 484 int j;
1101abfe 485
bb270c08
DB
486 if (i >= avi->movi_end) {
487 if (avi->is_odml) {
488 url_fskip(pb, avi->riff_end - i);
489 avi->riff_end = avi->movi_end = url_fsize(pb);
490 } else
491 break;
492 }
06219cb1 493
df99755b
MN
494 for(j=0; j<7; j++)
495 d[j]= d[j+1];
496 d[7]= get_byte(pb);
115329f1 497
df99755b 498 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
115329f1 499
df99755b 500 if( d[2] >= '0' && d[2] <= '9'
d2c5f0a4
MN
501 && d[3] >= '0' && d[3] <= '9'){
502 n= (d[2] - '0') * 10 + (d[3] - '0');
503 }else{
504 n= 100; //invalid stream id
df99755b 505 }
d2c5f0a4
MN
506//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);
507 if(i + size > avi->movi_end || d[0]<0)
508 continue;
115329f1 509
d2c5f0a4
MN
510 //parse ix##
511 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
bb270c08 512 //parse JUNK
d2c5f0a4 513 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')){
8f9298f8 514 url_fskip(pb, size);
d2c5f0a4 515//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
4a8d5135 516 goto resync;
8f9298f8 517 }
d2c5f0a4 518
df99755b 519 if( d[0] >= '0' && d[0] <= '9'
d2c5f0a4
MN
520 && d[1] >= '0' && d[1] <= '9'){
521 n= (d[0] - '0') * 10 + (d[1] - '0');
522 }else{
523 n= 100; //invalid stream id
524 }
115329f1 525
d2c5f0a4 526 //parse ##dc/##wb
80e3a08c 527 if(n < s->nb_streams){
d2c5f0a4
MN
528 AVStream *st;
529 AVIStream *ast;
530 st = s->streams[n];
531 ast = st->priv_data;
115329f1 532
f3356e9c
MN
533 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
534 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
535 || st->discard >= AVDISCARD_ALL){
536 if(ast->sample_size) ast->frame_offset += pkt->size;
537 else ast->frame_offset++;
b4aea108
MN
538 url_fskip(pb, size);
539 goto resync;
540 }
d2c5f0a4 541
115329f1 542 if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
d2c5f0a4 543 d[2]*256+d[3] == ast->prefix /*||
115329f1 544 (d[2] == 'd' && d[3] == 'c') ||
bb270c08 545 (d[2] == 'w' && d[3] == 'b')*/) {
d2c5f0a4
MN
546
547//av_log(NULL, AV_LOG_DEBUG, "OK\n");
548 if(d[2]*256+d[3] == ast->prefix)
549 ast->prefix_count++;
550 else{
551 ast->prefix= d[2]*256+d[3];
552 ast->prefix_count= 0;
553 }
554
7c7f3866
MN
555 avi->stream_index= n;
556 ast->packet_size= size + 8;
557 ast->remaining= size;
558 goto resync;
d2c5f0a4 559 }
df99755b 560 }
69bde0b2
MM
561 /* palette changed chunk */
562 if ( d[0] >= '0' && d[0] <= '9'
563 && d[1] >= '0' && d[1] <= '9'
564 && ((d[2] == 'p' && d[3] == 'c'))
565 && n < s->nb_streams && i + size <= avi->movi_end) {
566
567 AVStream *st;
568 int first, clr, flags, k, p;
569
570 st = s->streams[n];
571
572 first = get_byte(pb);
573 clr = get_byte(pb);
bb270c08
DB
574 if(!clr) /* all 256 colors used */
575 clr = 256;
69bde0b2
MM
576 flags = get_le16(pb);
577 p = 4;
578 for (k = first; k < clr + first; k++) {
579 int r, g, b;
580 r = get_byte(pb);
581 g = get_byte(pb);
582 b = get_byte(pb);
583 get_byte(pb);
01f4895c 584 st->codec->palctrl->palette[k] = b + (g << 8) + (r << 16);
69bde0b2 585 }
01f4895c 586 st->codec->palctrl->palette_changed = 1;
4a8d5135 587 goto resync;
69bde0b2
MM
588 }
589
df99755b 590 }
d2c5f0a4 591
df99755b 592 return -1;
de6d9b64
FB
593}
594
155e9ee9
FB
595/* XXX: we make the implicit supposition that the position are sorted
596 for each stream */
597static int avi_read_idx1(AVFormatContext *s, int size)
598{
7c7f3866 599 AVIContext *avi = s->priv_data;
155e9ee9
FB
600 ByteIOContext *pb = &s->pb;
601 int nb_index_entries, i;
602 AVStream *st;
603 AVIStream *ast;
155e9ee9 604 unsigned int index, tag, flags, pos, len;
7c7f3866 605 unsigned last_pos= -1;
115329f1 606
155e9ee9
FB
607 nb_index_entries = size / 16;
608 if (nb_index_entries <= 0)
609 return -1;
610
611 /* read the entries and sort them in each stream component */
612 for(i = 0; i < nb_index_entries; i++) {
613 tag = get_le32(pb);
614 flags = get_le32(pb);
615 pos = get_le32(pb);
616 len = get_le32(pb);
52a0bbff 617#if defined(DEBUG_SEEK)
115329f1 618 av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
155e9ee9
FB
619 i, tag, flags, pos, len);
620#endif
7c7f3866
MN
621 if(i==0 && pos > avi->movi_list)
622 avi->movi_list= 0; //FIXME better check
623
155e9ee9
FB
624 index = ((tag & 0xff) - '0') * 10;
625 index += ((tag >> 8) & 0xff) - '0';
626 if (index >= s->nb_streams)
627 continue;
628 st = s->streams[index];
629 ast = st->priv_data;
115329f1 630
52a0bbff
MN
631#if defined(DEBUG_SEEK)
632 av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%d\n", len, ast->cum_len);
633#endif
80e3a08c
MN
634 if(last_pos == pos)
635 avi->non_interleaved= 1;
636 else
7c7f3866
MN
637 av_add_index_entry(st, pos, ast->cum_len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
638 if(ast->sample_size)
639 ast->cum_len += len / ast->sample_size;
640 else
641 ast->cum_len ++;
7c7f3866 642 last_pos= pos;
155e9ee9
FB
643 }
644 return 0;
645}
646
7c7f3866 647static int guess_ni_flag(AVFormatContext *s){
7c7f3866
MN
648 int i;
649 int64_t last_start=0;
650 int64_t first_end= INT64_MAX;
115329f1 651
7c7f3866
MN
652 for(i=0; i<s->nb_streams; i++){
653 AVStream *st = s->streams[i];
7c7f3866
MN
654 int n= st->nb_index_entries;
655
656 if(n <= 0)
657 continue;
658
659 if(st->index_entries[0].pos > last_start)
660 last_start= st->index_entries[0].pos;
661 if(st->index_entries[n-1].pos < first_end)
662 first_end= st->index_entries[n-1].pos;
663 }
664 return last_start > first_end;
665}
666
155e9ee9
FB
667static int avi_load_index(AVFormatContext *s)
668{
669 AVIContext *avi = s->priv_data;
670 ByteIOContext *pb = &s->pb;
671 uint32_t tag, size;
e6c0297f 672 offset_t pos= url_ftell(pb);
115329f1 673
155e9ee9
FB
674 url_fseek(pb, avi->movi_end, SEEK_SET);
675#ifdef DEBUG_SEEK
676 printf("movi_end=0x%llx\n", avi->movi_end);
677#endif
678 for(;;) {
679 if (url_feof(pb))
680 break;
681 tag = get_le32(pb);
682 size = get_le32(pb);
683#ifdef DEBUG_SEEK
684 printf("tag=%c%c%c%c size=0x%x\n",
685 tag & 0xff,
686 (tag >> 8) & 0xff,
687 (tag >> 16) & 0xff,
688 (tag >> 24) & 0xff,
689 size);
690#endif
691 switch(tag) {
692 case MKTAG('i', 'd', 'x', '1'):
693 if (avi_read_idx1(s, size) < 0)
694 goto skip;
695 else
696 goto the_end;
697 break;
698 default:
699 skip:
700 size += (size & 1);
701 url_fskip(pb, size);
702 break;
703 }
704 }
705 the_end:
7c7f3866 706 avi->non_interleaved |= guess_ni_flag(s);
e6c0297f 707 url_fseek(pb, pos, SEEK_SET);
155e9ee9
FB
708 return 0;
709}
710
7b3c1382 711static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
155e9ee9
FB
712{
713 AVIContext *avi = s->priv_data;
714 AVStream *st;
52a0bbff 715 int i, index;
155e9ee9
FB
716 int64_t pos;
717
718 if (!avi->index_loaded) {
719 /* we only load the index on demand */
720 avi_load_index(s);
721 avi->index_loaded = 1;
722 }
52a0bbff 723 assert(stream_index>= 0);
155e9ee9
FB
724
725 st = s->streams[stream_index];
52a0bbff
MN
726 index= av_index_search_timestamp(st, timestamp, flags);
727 if(index<0)
155e9ee9 728 return -1;
115329f1 729
155e9ee9 730 /* find the position */
52a0bbff
MN
731 pos = st->index_entries[index].pos;
732 timestamp = st->index_entries[index].timestamp;
733
734// av_log(NULL, AV_LOG_DEBUG, "XX %Ld %d %Ld\n", timestamp, index, st->index_entries[index].timestamp);
155e9ee9 735
155e9ee9 736 for(i = 0; i < s->nb_streams; i++) {
52a0bbff
MN
737 AVStream *st2 = s->streams[i];
738 AVIStream *ast2 = st2->priv_data;
7c7f3866
MN
739
740 ast2->packet_size=
741 ast2->remaining= 0;
742
52a0bbff
MN
743 if (st2->nb_index_entries <= 0)
744 continue;
115329f1 745
52a0bbff
MN
746// assert(st2->codec.block_align);
747 assert(st2->time_base.den == ast2->rate);
748 assert(st2->time_base.num == ast2->scale);
749 index = av_index_search_timestamp(
115329f1 750 st2,
52a0bbff
MN
751 av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
752 flags | AVSEEK_FLAG_BACKWARD);
753 if(index<0)
754 index=0;
115329f1 755
7c7f3866
MN
756 if(!avi->non_interleaved){
757 while(index>0 && st2->index_entries[index].pos > pos)
758 index--;
759 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
760 index++;
761 }
762
52a0bbff
MN
763// av_log(NULL, AV_LOG_DEBUG, "%Ld %d %Ld\n", timestamp, index, st2->index_entries[index].timestamp);
764 /* extract the current frame number */
765 ast2->frame_offset = st2->index_entries[index].timestamp;
766 if(ast2->sample_size)
767 ast2->frame_offset *=ast2->sample_size;
155e9ee9 768 }
52a0bbff 769
664f5836
RS
770 if (avi->dv_demux)
771 dv_flush_audio_packets(avi->dv_demux);
155e9ee9
FB
772 /* do the seek */
773 pos += avi->movi_list;
774 url_fseek(&s->pb, pos, SEEK_SET);
7c7f3866 775 avi->stream_index= -1;
155e9ee9
FB
776 return 0;
777}
778
1101abfe 779static int avi_read_close(AVFormatContext *s)
de6d9b64 780{
5ae2c73e
MN
781 int i;
782 AVIContext *avi = s->priv_data;
5ae2c73e
MN
783
784 for(i=0;i<s->nb_streams;i++) {
785 AVStream *st = s->streams[i];
155e9ee9 786 AVIStream *ast = st->priv_data;
52a0bbff 787 av_free(ast);
01f4895c
MN
788 av_free(st->codec->extradata);
789 av_free(st->codec->palctrl);
5ae2c73e
MN
790 }
791
7458ccbb
RS
792 if (avi->dv_demux)
793 av_free(avi->dv_demux);
794
c9a65ca8
FB
795 return 0;
796}
797
798static int avi_probe(AVProbeData *p)
799{
800 /* check file header */
801 if (p->buf_size <= 32)
802 return 0;
803 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
804 p->buf[2] == 'F' && p->buf[3] == 'F' &&
805 p->buf[8] == 'A' && p->buf[9] == 'V' &&
806 p->buf[10] == 'I' && p->buf[11] == ' ')
807 return AVPROBE_SCORE_MAX;
808 else
809 return 0;
810}
811
812static AVInputFormat avi_iformat = {
813 "avi",
814 "avi format",
815 sizeof(AVIContext),
816 avi_probe,
817 avi_read_header,
818 avi_read_packet,
819 avi_read_close,
155e9ee9 820 avi_read_seek,
c9a65ca8
FB
821};
822
823int avidec_init(void)
824{
825 av_register_input_format(&avi_iformat);
de6d9b64
FB
826 return 0;
827}