Correct doxy about timestamp units of read_timestamp().
[libav.git] / libavformat / avidec.c
CommitLineData
de6d9b64 1/*
7fbde343 2 * AVI demuxer
19720f15 3 * Copyright (c) 2001 Fabrice Bellard.
de6d9b64 4 *
b78e7197
DB
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
19720f15
FB
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
b78e7197 10 * version 2.1 of the License, or (at your option) any later version.
de6d9b64 11 *
b78e7197 12 * FFmpeg is distributed in the hope that it will be useful,
de6d9b64 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19720f15
FB
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
de6d9b64 16 *
19720f15 17 * You should have received a copy of the GNU Lesser General Public
b78e7197 18 * License along with FFmpeg; if not, write to the Free Software
5509bffa 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
de6d9b64 20 */
de6d9b64
FB
21#include "avformat.h"
22#include "avi.h"
7458ccbb 23#include "dv.h"
9d9f4119 24#include "riff.h"
de6d9b64 25
52a0bbff
MN
26#undef NDEBUG
27#include <assert.h>
28
de6d9b64 29//#define DEBUG
155e9ee9
FB
30//#define DEBUG_SEEK
31
155e9ee9 32typedef struct AVIStream {
7c7f3866 33 int64_t frame_offset; /* current frame (video) or byte (audio) counter
155e9ee9 34 (used to compute the pts) */
7c7f3866
MN
35 int remaining;
36 int packet_size;
37
155e9ee9 38 int scale;
115329f1 39 int rate;
8223bca5 40 int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
115329f1 41
94d1d6c0 42 int64_t cum_len; /* temporary storage (used during seek) */
115329f1 43
d2c5f0a4
MN
44 int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
45 int prefix_count;
155e9ee9 46} AVIStream;
de6d9b64
FB
47
48typedef struct {
7458ccbb
RS
49 int64_t riff_end;
50 int64_t movi_end;
ea4b2b5e 51 int64_t fsize;
de6d9b64 52 offset_t movi_list;
155e9ee9 53 int index_loaded;
8f9298f8 54 int is_odml;
7c7f3866
MN
55 int non_interleaved;
56 int stream_index;
ddaae6a9 57 DVDemuxContext* dv_demux;
de6d9b64
FB
58} AVIContext;
59
7b31b092
AJ
60static const char avi_headers[][8] = {
61 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
62 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
63 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
b925ef61 64 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
0b04ebb3 65 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
7b31b092
AJ
66 { 0 }
67};
68
42feef6b 69static int avi_load_index(AVFormatContext *s);
30a43f2d 70static int guess_ni_flag(AVFormatContext *s);
42feef6b 71
de6d9b64 72#ifdef DEBUG
1101abfe 73static void print_tag(const char *str, unsigned int tag, int size)
de6d9b64
FB
74{
75 printf("%s: tag=%c%c%c%c size=0x%x\n",
76 str, tag & 0xff,
77 (tag >> 8) & 0xff,
78 (tag >> 16) & 0xff,
79 (tag >> 24) & 0xff,
80 size);
81}
82#endif
83
06219cb1
RS
84static int get_riff(AVIContext *avi, ByteIOContext *pb)
85{
7b31b092
AJ
86 char header[8];
87 int i;
06219cb1 88
7b31b092
AJ
89 /* check RIFF header */
90 get_buffer(pb, header, 4);
06219cb1
RS
91 avi->riff_end = get_le32(pb); /* RIFF chunk size */
92 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
7b31b092
AJ
93 get_buffer(pb, header+4, 4);
94
95 for(i=0; avi_headers[i][0]; i++)
96 if(!memcmp(header, avi_headers[i], 8))
97 break;
98 if(!avi_headers[i][0])
06219cb1 99 return -1;
115329f1 100
7b31b092
AJ
101 if(header[7] == 0x19)
102 av_log(NULL, AV_LOG_INFO, "file has been generated with a totally broken muxer\n");
103
06219cb1
RS
104 return 0;
105}
106
94d1d6c0 107static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
8945ebb9 108 AVIContext *avi = s->priv_data;
899681cd 109 ByteIOContext *pb = s->pb;
94d1d6c0
MN
110 int longs_pre_entry= get_le16(pb);
111 int index_sub_type = get_byte(pb);
112 int index_type = get_byte(pb);
113 int entries_in_use = get_le32(pb);
114 int chunk_id = get_le32(pb);
115 int64_t base = get_le64(pb);
116 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
117 AVStream *st;
118 AVIStream *ast;
119 int i;
8945ebb9 120 int64_t last_pos= -1;
899681cd 121 int64_t filesize= url_fsize(s->pb);
94d1d6c0 122
965a63af 123#ifdef DEBUG_SEEK
949b1a13 124 av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
965a63af
MN
125 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
126#endif
94d1d6c0
MN
127
128 if(stream_id > s->nb_streams || stream_id < 0)
129 return -1;
130 st= s->streams[stream_id];
131 ast = st->priv_data;
132
133 if(index_sub_type)
134 return -1;
135
136 get_le32(pb);
137
138 if(index_type && longs_pre_entry != 2)
139 return -1;
140 if(index_type>1)
141 return -1;
142
965a63af
MN
143 if(filesize > 0 && base >= filesize){
144 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
145 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
146 base &= 0xFFFFFFFF;
147 else
148 return -1;
149 }
150
94d1d6c0
MN
151 for(i=0; i<entries_in_use; i++){
152 if(index_type){
30a43f2d 153 int64_t pos= get_le32(pb) + base - 8;
94d1d6c0 154 int len = get_le32(pb);
30a43f2d 155 int key= len >= 0;
94d1d6c0
MN
156 len &= 0x7FFFFFFF;
157
965a63af 158#ifdef DEBUG_SEEK
949b1a13 159 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
965a63af 160#endif
8945ebb9
MN
161 if(last_pos == pos || pos == base - 8)
162 avi->non_interleaved= 1;
163 else
2b70eb2b 164 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
30a43f2d 165
94d1d6c0 166 if(ast->sample_size)
2b70eb2b 167 ast->cum_len += len;
94d1d6c0
MN
168 else
169 ast->cum_len ++;
8945ebb9 170 last_pos= pos;
94d1d6c0 171 }else{
26b89135
MR
172 int64_t offset, pos;
173 int duration;
174 offset = get_le64(pb);
175 get_le32(pb); /* size */
176 duration = get_le32(pb);
177 pos = url_ftell(pb);
94d1d6c0
MN
178
179 url_fseek(pb, offset+8, SEEK_SET);
180 read_braindead_odml_indx(s, frame_num);
181 frame_num += duration;
182
183 url_fseek(pb, pos, SEEK_SET);
184 }
185 }
965a63af 186 avi->index_loaded=1;
94d1d6c0
MN
187 return 0;
188}
189
115e8ae5 190static void clean_index(AVFormatContext *s){
965a63af
MN
191 int i;
192 int64_t j;
115e8ae5
MN
193
194 for(i=0; i<s->nb_streams; i++){
195 AVStream *st = s->streams[i];
196 AVIStream *ast = st->priv_data;
197 int n= st->nb_index_entries;
198 int max= ast->sample_size;
199 int64_t pos, size, ts;
200
201 if(n != 1 || ast->sample_size==0)
202 continue;
203
204 while(max < 1024) max+=max;
205
206 pos= st->index_entries[0].pos;
207 size= st->index_entries[0].size;
208 ts= st->index_entries[0].timestamp;
209
210 for(j=0; j<size; j+=max){
211 av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
212 }
213 }
214}
215
57060f89
DC
216static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen, unsigned int size)
217{
218 offset_t i = url_ftell(pb);
219 size += (size & 1);
220 get_strz(pb, buf, maxlen);
221 url_fseek(pb, i+size, SEEK_SET);
222 return 0;
223}
224
1101abfe 225static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
de6d9b64 226{
c9a65ca8 227 AVIContext *avi = s->priv_data;
899681cd 228 ByteIOContext *pb = s->pb;
deb0a292 229 uint32_t tag, tag1, handler;
b53f1064 230 int codec_type, stream_index, frame_period, bit_rate;
247eadca 231 unsigned int size, nb_frames;
6d29fba9 232 int i;
de6d9b64 233 AVStream *st;
26b89135 234 AVIStream *ast = NULL;
2ad4648f 235 char str_track[4];
0b04ebb3
VV
236 int avih_width=0, avih_height=0;
237 int amv_file_format=0;
de6d9b64 238
7c7f3866 239 avi->stream_index= -1;
115329f1 240
06219cb1 241 if (get_riff(avi, pb) < 0)
de6d9b64 242 return -1;
1101abfe 243
ea4b2b5e
MN
244 avi->fsize = url_fsize(pb);
245 if(avi->fsize<=0)
246 avi->fsize= avi->riff_end;
247
de6d9b64
FB
248 /* first list tag */
249 stream_index = -1;
250 codec_type = -1;
251 frame_period = 0;
252 for(;;) {
253 if (url_feof(pb))
254 goto fail;
255 tag = get_le32(pb);
256 size = get_le32(pb);
257#ifdef DEBUG
258 print_tag("tag", tag, size);
259#endif
260
261 switch(tag) {
262 case MKTAG('L', 'I', 'S', 'T'):
263 /* ignored, except when start of video packets */
264 tag1 = get_le32(pb);
265#ifdef DEBUG
266 print_tag("list", tag1, 0);
267#endif
268 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
155e9ee9 269 avi->movi_list = url_ftell(pb) - 4;
2064c77a 270 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
a965c478 271 else avi->movi_end = url_fsize(pb);
de6d9b64 272#ifdef DEBUG
949b1a13 273 printf("movi end=%"PRIx64"\n", avi->movi_end);
de6d9b64
FB
274#endif
275 goto end_of_header;
276 }
277 break;
8f9298f8 278 case MKTAG('d', 'm', 'l', 'h'):
bb270c08
DB
279 avi->is_odml = 1;
280 url_fskip(pb, size + (size & 1));
281 break;
0b04ebb3
VV
282 case MKTAG('a', 'm', 'v', 'h'):
283 amv_file_format=1;
de6d9b64 284 case MKTAG('a', 'v', 'i', 'h'):
bb270c08 285 /* avi header */
1101abfe 286 /* using frame_period is bad idea */
de6d9b64
FB
287 frame_period = get_le32(pb);
288 bit_rate = get_le32(pb) * 8;
1894edeb
MN
289 get_le32(pb);
290 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
291
292 url_fskip(pb, 2 * 4);
6d29fba9 293 get_le32(pb);
0b04ebb3
VV
294 get_le32(pb);
295 avih_width=get_le32(pb);
296 avih_height=get_le32(pb);
6d29fba9 297
0b04ebb3 298 url_fskip(pb, size - 10 * 4);
6d29fba9
MN
299 break;
300 case MKTAG('s', 't', 'r', 'h'):
301 /* stream header */
302
303 tag1 = get_le32(pb);
304 handler = get_le32(pb); /* codec tag */
305
306 if(tag1 == MKTAG('p', 'a', 'd', 's')){
307 url_fskip(pb, size - 8);
308 break;
309 }else{
310 stream_index++;
311 st = av_new_stream(s, stream_index);
de6d9b64
FB
312 if (!st)
313 goto fail;
9ee91c2f 314
155e9ee9
FB
315 ast = av_mallocz(sizeof(AVIStream));
316 if (!ast)
317 goto fail;
318 st->priv_data = ast;
bb270c08 319 }
0b04ebb3
VV
320 if(amv_file_format)
321 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
6d29fba9 322
cc11e2b3 323#ifdef DEBUG
e344c1ea 324 print_tag("strh", tag1, -1);
cc11e2b3 325#endif
b53f1064 326 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
6eb2de74
RS
327 int64_t dv_dur;
328
115329f1 329 /*
bb270c08
DB
330 * After some consideration -- I don't think we
331 * have to support anything but DV in a type1 AVIs.
332 */
333 if (s->nb_streams != 1)
334 goto fail;
335
336 if (handler != MKTAG('d', 'v', 's', 'd') &&
337 handler != MKTAG('d', 'v', 'h', 'd') &&
338 handler != MKTAG('d', 'v', 's', 'l'))
339 goto fail;
340
341 ast = s->streams[0]->priv_data;
342 av_freep(&s->streams[0]->codec->extradata);
343 av_freep(&s->streams[0]);
344 s->nb_streams = 0;
a2a6332b 345 if (ENABLE_DV_DEMUXER) {
38ca53da
AJ
346 avi->dv_demux = dv_init_demux(s);
347 if (!avi->dv_demux)
348 goto fail;
a2a6332b 349 }
bb270c08
DB
350 s->streams[0]->priv_data = ast;
351 url_fskip(pb, 3 * 4);
352 ast->scale = get_le32(pb);
353 ast->rate = get_le32(pb);
6eb2de74
RS
354 url_fskip(pb, 4); /* start time */
355
356 dv_dur = get_le32(pb);
357 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
358 dv_dur *= AV_TIME_BASE;
359 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
360 }
361 /*
362 * else, leave duration alone; timing estimation in utils.c
363 * will make a guess based on bit rate.
364 */
365
bb270c08 366 stream_index = s->nb_streams - 1;
6eb2de74 367 url_fskip(pb, size - 9*4);
b53f1064
MN
368 break;
369 }
b559b29b 370
6d29fba9 371 assert(stream_index < s->nb_streams);
01f4895c 372 st->codec->stream_codec_tag= handler;
b559b29b 373
b53f1064
MN
374 get_le32(pb); /* flags */
375 get_le16(pb); /* priority */
376 get_le16(pb); /* language */
377 get_le32(pb); /* initial frame */
378 ast->scale = get_le32(pb);
379 ast->rate = get_le32(pb);
380 if(ast->scale && ast->rate){
381 }else if(frame_period){
382 ast->rate = 1000000;
383 ast->scale = frame_period;
384 }else{
385 ast->rate = 25;
386 ast->scale = 1;
387 }
388 av_set_pts_info(st, 64, ast->scale, ast->rate);
115329f1 389
b72a2bc8 390 ast->cum_len=get_le32(pb); /* start */
b53f1064 391 nb_frames = get_le32(pb);
b559b29b 392
b53f1064 393 st->start_time = 0;
c0df9d75 394 st->duration = nb_frames;
b53f1064
MN
395 get_le32(pb); /* buffer size */
396 get_le32(pb); /* quality */
397 ast->sample_size = get_le32(pb); /* sample ssize */
2b70eb2b 398 ast->cum_len *= FFMAX(1, ast->sample_size);
b53f1064 399// av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
247eadca 400
b53f1064 401 switch(tag1) {
bb270c08 402 case MKTAG('v', 'i', 'd', 's'):
b53f1064 403 codec_type = CODEC_TYPE_VIDEO;
247eadca 404
b53f1064 405 ast->sample_size = 0;
b53f1064
MN
406 break;
407 case MKTAG('a', 'u', 'd', 's'):
408 codec_type = CODEC_TYPE_AUDIO;
9bf9a5fc 409 break;
cc11e2b3 410 case MKTAG('t', 'x', 't', 's'):
115329f1 411 //FIXME
cc11e2b3 412 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
cc11e2b3 413 break;
9bf9a5fc 414 default:
30667f42 415 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
9bf9a5fc 416 goto fail;
de6d9b64 417 }
2b70eb2b 418 ast->frame_offset= ast->cum_len;
b53f1064 419 url_fskip(pb, size - 12 * 4);
de6d9b64
FB
420 break;
421 case MKTAG('s', 't', 'r', 'f'):
422 /* stream header */
6d29fba9 423 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
de6d9b64
FB
424 url_fskip(pb, size);
425 } else {
426 st = s->streams[stream_index];
427 switch(codec_type) {
428 case CODEC_TYPE_VIDEO:
0b04ebb3
VV
429 if(amv_file_format){
430 st->codec->width=avih_width;
431 st->codec->height=avih_height;
432 st->codec->codec_type = CODEC_TYPE_VIDEO;
433 st->codec->codec_id = CODEC_ID_AMV;
434 url_fskip(pb, size);
435 break;
436 }
de6d9b64 437 get_le32(pb); /* size */
01f4895c
MN
438 st->codec->width = get_le32(pb);
439 st->codec->height = get_le32(pb);
de6d9b64 440 get_le16(pb); /* panes */
01f4895c 441 st->codec->bits_per_sample= get_le16(pb); /* depth */
de6d9b64 442 tag1 = get_le32(pb);
b559b29b
MN
443 get_le32(pb); /* ImageSize */
444 get_le32(pb); /* XPelsPerMeter */
445 get_le32(pb); /* YPelsPerMeter */
446 get_le32(pb); /* ClrUsed */
447 get_le32(pb); /* ClrImportant */
448
cbb79c0e
RD
449 if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
450 st->codec->codec_type = CODEC_TYPE_SUBTITLE;
451 st->codec->codec_tag = tag1;
452 st->codec->codec_id = CODEC_ID_XSUB;
453 break;
454 }
455
e344c1ea
SH
456 if(size > 10*4 && size<(1<<30)){
457 st->codec->extradata_size= size - 10*4;
458 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
459 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
460 }
115329f1 461
01f4895c 462 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
952c69c4 463 get_byte(pb);
b559b29b 464
5e29abf8
RT
465 /* Extract palette from extradata if bpp <= 8 */
466 /* This code assumes that extradata contains only palette */
467 /* This is true for all paletted codecs implemented in ffmpeg */
01f4895c
MN
468 if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
469 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
5e29abf8 470#ifdef WORDS_BIGENDIAN
01f4895c
MN
471 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
472 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
5e29abf8 473#else
01f4895c
MN
474 memcpy(st->codec->palctrl->palette, st->codec->extradata,
475 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
5e29abf8 476#endif
01f4895c 477 st->codec->palctrl->palette_changed = 1;
5e29abf8
RT
478 }
479
de6d9b64
FB
480#ifdef DEBUG
481 print_tag("video", tag1, 0);
482#endif
01f4895c
MN
483 st->codec->codec_type = CODEC_TYPE_VIDEO;
484 st->codec->codec_tag = tag1;
485 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
57004ff1 486 st->need_parsing = AVSTREAM_PARSE_HEADERS; // this is needed to get the pict type which is needed for generating correct pts
b559b29b 487// url_fskip(pb, size - 5 * 4);
de6d9b64 488 break;
9bf9a5fc 489 case CODEC_TYPE_AUDIO:
01f4895c 490 get_wav_header(pb, st->codec, size);
e84dab5f
MN
491 if(ast->sample_size && st->codec->block_align && ast->sample_size % st->codec->block_align)
492 av_log(s, AV_LOG_DEBUG, "invalid sample size or block align detected\n");
1cef9527
FR
493 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
494 url_fskip(pb, 1);
5836d158 495 /* Force parsing as several audio frames can be in
a74008a4
JP
496 * one packet and timestamps refer to packet start*/
497 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
cbee7a69
BC
498 /* ADTS header is in extradata, AAC without header must be stored as exact frames, parser not needed and it will fail */
499 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
57004ff1 500 st->need_parsing = AVSTREAM_PARSE_NONE;
8662900b
DB
501 /* AVI files with Xan DPCM audio (wrongly) declare PCM
502 * audio in the header but have Axan as stream_code_tag. */
503 if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){
504 st->codec->codec_id = CODEC_ID_XAN_DPCM;
505 st->codec->codec_tag = 0;
506 }
0b04ebb3
VV
507 if (amv_file_format)
508 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
de6d9b64
FB
509 break;
510 default:
01f4895c
MN
511 st->codec->codec_type = CODEC_TYPE_DATA;
512 st->codec->codec_id= CODEC_ID_NONE;
513 st->codec->codec_tag= 0;
de6d9b64
FB
514 url_fskip(pb, size);
515 break;
516 }
517 }
518 break;
94d1d6c0
MN
519 case MKTAG('i', 'n', 'd', 'x'):
520 i= url_ftell(pb);
2c00106c 521 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
b7b22558 522 read_braindead_odml_indx(s, 0);
b7b22558 523 }
94d1d6c0
MN
524 url_fseek(pb, i+size, SEEK_SET);
525 break;
57060f89
DC
526 case MKTAG('I', 'N', 'A', 'M'):
527 avi_read_tag(pb, s->title, sizeof(s->title), size);
528 break;
529 case MKTAG('I', 'A', 'R', 'T'):
530 avi_read_tag(pb, s->author, sizeof(s->author), size);
531 break;
532 case MKTAG('I', 'C', 'O', 'P'):
533 avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
534 break;
535 case MKTAG('I', 'C', 'M', 'T'):
536 avi_read_tag(pb, s->comment, sizeof(s->comment), size);
537 break;
538 case MKTAG('I', 'G', 'N', 'R'):
539 avi_read_tag(pb, s->genre, sizeof(s->genre), size);
540 break;
f0861f46
PI
541 case MKTAG('I', 'P', 'R', 'D'):
542 avi_read_tag(pb, s->album, sizeof(s->album), size);
543 break;
2ad4648f
PI
544 case MKTAG('I', 'P', 'R', 'T'):
545 avi_read_tag(pb, str_track, sizeof(str_track), size);
546 sscanf(str_track, "%d", &s->track);
547 break;
de6d9b64 548 default:
755c18ae
MN
549 if(size > 1000000){
550 av_log(s, AV_LOG_ERROR, "well something went wrong during header parsing, "
551 "ill ignore it and try to continue anyway\n");
552 avi->movi_list = url_ftell(pb) - 4;
553 avi->movi_end = url_fsize(pb);
554 goto end_of_header;
555 }
de6d9b64
FB
556 /* skip tag */
557 size += (size & 1);
558 url_fskip(pb, size);
559 break;
560 }
561 }
562 end_of_header:
563 /* check stream number */
564 if (stream_index != s->nb_streams - 1) {
565 fail:
566 for(i=0;i<s->nb_streams;i++) {
01f4895c 567 av_freep(&s->streams[i]->codec->extradata);
9145f8b3 568 av_freep(&s->streams[i]);
de6d9b64
FB
569 }
570 return -1;
571 }
1101abfe 572
b7b22558 573 if(!avi->index_loaded && !url_is_streamed(pb))
94d1d6c0 574 avi_load_index(s);
42feef6b 575 avi->index_loaded = 1;
30a43f2d 576 avi->non_interleaved |= guess_ni_flag(s);
115e8ae5
MN
577 if(avi->non_interleaved)
578 clean_index(s);
115329f1 579
de6d9b64
FB
580 return 0;
581}
582
1101abfe 583static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
de6d9b64
FB
584{
585 AVIContext *avi = s->priv_data;
899681cd 586 ByteIOContext *pb = s->pb;
8f9298f8 587 int n, d[8], size;
4a8d5135 588 offset_t i, sync;
7458ccbb 589 void* dstr;
115329f1 590
a2a6332b 591 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
7458ccbb 592 size = dv_get_packet(avi->dv_demux, pkt);
bb270c08
DB
593 if (size >= 0)
594 return size;
2af7e610 595 }
115329f1 596
7c7f3866 597 if(avi->non_interleaved){
79396ac6 598 int best_stream_index = 0;
7c7f3866
MN
599 AVStream *best_st= NULL;
600 AVIStream *best_ast;
601 int64_t best_ts= INT64_MAX;
602 int i;
115329f1 603
7c7f3866
MN
604 for(i=0; i<s->nb_streams; i++){
605 AVStream *st = s->streams[i];
606 AVIStream *ast = st->priv_data;
607 int64_t ts= ast->frame_offset;
608
609 if(ast->sample_size)
610 ts /= ast->sample_size;
611 ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
612
949b1a13 613// av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
7c7f3866
MN
614 if(ts < best_ts){
615 best_ts= ts;
616 best_st= st;
617 best_stream_index= i;
618 }
619 }
620 best_ast = best_st->priv_data;
621 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
622 if(best_ast->remaining)
623 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
624 else
625 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
626
627// av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
628 if(i>=0){
629 int64_t pos= best_st->index_entries[i].pos;
5c89153e 630 pos += best_ast->packet_size - best_ast->remaining;
899681cd 631 url_fseek(s->pb, pos + 8, SEEK_SET);
949b1a13 632// av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
115329f1 633
8223bca5
MN
634 assert(best_ast->remaining <= best_ast->packet_size);
635
1894edeb
MN
636 avi->stream_index= best_stream_index;
637 if(!best_ast->remaining)
8223bca5 638 best_ast->packet_size=
1894edeb 639 best_ast->remaining= best_st->index_entries[i].size;
7c7f3866
MN
640 }
641 }
115329f1 642
4a8d5135 643resync:
7c7f3866
MN
644 if(avi->stream_index >= 0){
645 AVStream *st= s->streams[ avi->stream_index ];
646 AVIStream *ast= st->priv_data;
647 int size;
115329f1 648
e84dab5f 649 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
7c7f3866 650 size= INT_MAX;
115329f1 651 else if(ast->sample_size < 32)
7c7f3866
MN
652 size= 64*ast->sample_size;
653 else
654 size= ast->sample_size;
655
656 if(size > ast->remaining)
657 size= ast->remaining;
2692067a 658 av_get_packet(pb, pkt, size);
115329f1 659
a2a6332b 660 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
7c7f3866
MN
661 dstr = pkt->destruct;
662 size = dv_produce_packet(avi->dv_demux, pkt,
663 pkt->data, pkt->size);
664 pkt->destruct = dstr;
665 pkt->flags |= PKT_FLAG_KEY;
666 } else {
667 /* XXX: how to handle B frames in avi ? */
668 pkt->dts = ast->frame_offset;
669// pkt->dts += ast->start;
670 if(ast->sample_size)
671 pkt->dts /= ast->sample_size;
949b1a13 672//av_log(NULL, 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);
7c7f3866
MN
673 pkt->stream_index = avi->stream_index;
674
01f4895c 675 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
4323b09d
MN
676 AVIndexEntry *e;
677 int index;
ded3c7da 678 assert(st->index_entries);
7c7f3866 679
4323b09d
MN
680 index= av_index_search_timestamp(st, pkt->dts, 0);
681 e= &st->index_entries[index];
115329f1 682
4323b09d
MN
683 if(index >= 0 && e->timestamp == ast->frame_offset){
684 if (e->flags & AVINDEX_KEYFRAME)
685 pkt->flags |= PKT_FLAG_KEY;
686 }
7c7f3866 687 } else {
115329f1 688 pkt->flags |= PKT_FLAG_KEY;
7c7f3866
MN
689 }
690 if(ast->sample_size)
691 ast->frame_offset += pkt->size;
692 else
693 ast->frame_offset++;
694 }
695 ast->remaining -= size;
696 if(!ast->remaining){
697 avi->stream_index= -1;
698 ast->packet_size= 0;
7c7f3866
MN
699 }
700
701 return size;
702 }
703
4a8d5135
MN
704 memset(d, -1, sizeof(int)*8);
705 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
df99755b 706 int j;
1101abfe 707
df99755b
MN
708 for(j=0; j<7; j++)
709 d[j]= d[j+1];
710 d[7]= get_byte(pb);
115329f1 711
df99755b 712 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
115329f1 713
df99755b 714 if( d[2] >= '0' && d[2] <= '9'
d2c5f0a4
MN
715 && d[3] >= '0' && d[3] <= '9'){
716 n= (d[2] - '0') * 10 + (d[3] - '0');
717 }else{
718 n= 100; //invalid stream id
df99755b 719 }
949b1a13 720//av_log(NULL, 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);
ea4b2b5e 721 if(i + size > avi->fsize || d[0]<0)
d2c5f0a4 722 continue;
115329f1 723
d2c5f0a4
MN
724 //parse ix##
725 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
bb270c08 726 //parse JUNK
bc3a73bc
MN
727 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
728 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
8f9298f8 729 url_fskip(pb, size);
d2c5f0a4 730//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
4a8d5135 731 goto resync;
8f9298f8 732 }
d2c5f0a4 733
df99755b 734 if( d[0] >= '0' && d[0] <= '9'
d2c5f0a4
MN
735 && d[1] >= '0' && d[1] <= '9'){
736 n= (d[0] - '0') * 10 + (d[1] - '0');
737 }else{
738 n= 100; //invalid stream id
739 }
115329f1 740
d2c5f0a4 741 //parse ##dc/##wb
80e3a08c 742 if(n < s->nb_streams){
d2c5f0a4
MN
743 AVStream *st;
744 AVIStream *ast;
745 st = s->streams[n];
746 ast = st->priv_data;
115329f1 747
f3356e9c
MN
748 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
749 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
750 || st->discard >= AVDISCARD_ALL){
751 if(ast->sample_size) ast->frame_offset += pkt->size;
752 else ast->frame_offset++;
b4aea108
MN
753 url_fskip(pb, size);
754 goto resync;
755 }
d2c5f0a4 756
115329f1 757 if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
d2c5f0a4 758 d[2]*256+d[3] == ast->prefix /*||
115329f1 759 (d[2] == 'd' && d[3] == 'c') ||
bb270c08 760 (d[2] == 'w' && d[3] == 'b')*/) {
d2c5f0a4
MN
761
762//av_log(NULL, AV_LOG_DEBUG, "OK\n");
763 if(d[2]*256+d[3] == ast->prefix)
764 ast->prefix_count++;
765 else{
766 ast->prefix= d[2]*256+d[3];
767 ast->prefix_count= 0;
768 }
769
7c7f3866
MN
770 avi->stream_index= n;
771 ast->packet_size= size + 8;
772 ast->remaining= size;
ded3c7da
MN
773
774 {
775 uint64_t pos= url_ftell(pb) - 8;
776 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
777 av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
778 }
779 }
7c7f3866 780 goto resync;
d2c5f0a4 781 }
df99755b 782 }
69bde0b2
MM
783 /* palette changed chunk */
784 if ( d[0] >= '0' && d[0] <= '9'
785 && d[1] >= '0' && d[1] <= '9'
786 && ((d[2] == 'p' && d[3] == 'c'))
ea4b2b5e 787 && n < s->nb_streams && i + size <= avi->fsize) {
69bde0b2
MM
788
789 AVStream *st;
790 int first, clr, flags, k, p;
791
792 st = s->streams[n];
793
794 first = get_byte(pb);
795 clr = get_byte(pb);
bb270c08
DB
796 if(!clr) /* all 256 colors used */
797 clr = 256;
69bde0b2
MM
798 flags = get_le16(pb);
799 p = 4;
800 for (k = first; k < clr + first; k++) {
801 int r, g, b;
802 r = get_byte(pb);
803 g = get_byte(pb);
804 b = get_byte(pb);
805 get_byte(pb);
01f4895c 806 st->codec->palctrl->palette[k] = b + (g << 8) + (r << 16);
69bde0b2 807 }
01f4895c 808 st->codec->palctrl->palette_changed = 1;
4a8d5135 809 goto resync;
69bde0b2
MM
810 }
811
df99755b 812 }
d2c5f0a4 813
df99755b 814 return -1;
de6d9b64
FB
815}
816
155e9ee9
FB
817/* XXX: we make the implicit supposition that the position are sorted
818 for each stream */
819static int avi_read_idx1(AVFormatContext *s, int size)
820{
7c7f3866 821 AVIContext *avi = s->priv_data;
899681cd 822 ByteIOContext *pb = s->pb;
155e9ee9
FB
823 int nb_index_entries, i;
824 AVStream *st;
825 AVIStream *ast;
155e9ee9 826 unsigned int index, tag, flags, pos, len;
7c7f3866 827 unsigned last_pos= -1;
115329f1 828
155e9ee9
FB
829 nb_index_entries = size / 16;
830 if (nb_index_entries <= 0)
831 return -1;
832
833 /* read the entries and sort them in each stream component */
834 for(i = 0; i < nb_index_entries; i++) {
835 tag = get_le32(pb);
836 flags = get_le32(pb);
837 pos = get_le32(pb);
838 len = get_le32(pb);
52a0bbff 839#if defined(DEBUG_SEEK)
115329f1 840 av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
155e9ee9
FB
841 i, tag, flags, pos, len);
842#endif
7c7f3866
MN
843 if(i==0 && pos > avi->movi_list)
844 avi->movi_list= 0; //FIXME better check
5c89153e 845 pos += avi->movi_list;
7c7f3866 846
155e9ee9
FB
847 index = ((tag & 0xff) - '0') * 10;
848 index += ((tag >> 8) & 0xff) - '0';
849 if (index >= s->nb_streams)
850 continue;
851 st = s->streams[index];
852 ast = st->priv_data;
115329f1 853
52a0bbff 854#if defined(DEBUG_SEEK)
949b1a13 855 av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
52a0bbff 856#endif
80e3a08c
MN
857 if(last_pos == pos)
858 avi->non_interleaved= 1;
859 else
2b70eb2b 860 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
7c7f3866 861 if(ast->sample_size)
2b70eb2b 862 ast->cum_len += len;
7c7f3866
MN
863 else
864 ast->cum_len ++;
7c7f3866 865 last_pos= pos;
155e9ee9
FB
866 }
867 return 0;
868}
869
7c7f3866 870static int guess_ni_flag(AVFormatContext *s){
7c7f3866
MN
871 int i;
872 int64_t last_start=0;
873 int64_t first_end= INT64_MAX;
115329f1 874
7c7f3866
MN
875 for(i=0; i<s->nb_streams; i++){
876 AVStream *st = s->streams[i];
7c7f3866
MN
877 int n= st->nb_index_entries;
878
879 if(n <= 0)
880 continue;
881
882 if(st->index_entries[0].pos > last_start)
883 last_start= st->index_entries[0].pos;
884 if(st->index_entries[n-1].pos < first_end)
885 first_end= st->index_entries[n-1].pos;
886 }
887 return last_start > first_end;
888}
889
155e9ee9
FB
890static int avi_load_index(AVFormatContext *s)
891{
892 AVIContext *avi = s->priv_data;
899681cd 893 ByteIOContext *pb = s->pb;
155e9ee9 894 uint32_t tag, size;
e6c0297f 895 offset_t pos= url_ftell(pb);
115329f1 896
155e9ee9
FB
897 url_fseek(pb, avi->movi_end, SEEK_SET);
898#ifdef DEBUG_SEEK
949b1a13 899 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
155e9ee9
FB
900#endif
901 for(;;) {
902 if (url_feof(pb))
903 break;
904 tag = get_le32(pb);
905 size = get_le32(pb);
906#ifdef DEBUG_SEEK
907 printf("tag=%c%c%c%c size=0x%x\n",
908 tag & 0xff,
909 (tag >> 8) & 0xff,
910 (tag >> 16) & 0xff,
911 (tag >> 24) & 0xff,
912 size);
913#endif
914 switch(tag) {
915 case MKTAG('i', 'd', 'x', '1'):
916 if (avi_read_idx1(s, size) < 0)
917 goto skip;
918 else
919 goto the_end;
920 break;
921 default:
922 skip:
923 size += (size & 1);
924 url_fskip(pb, size);
925 break;
926 }
927 }
928 the_end:
e6c0297f 929 url_fseek(pb, pos, SEEK_SET);
155e9ee9
FB
930 return 0;
931}
932
7b3c1382 933static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
155e9ee9
FB
934{
935 AVIContext *avi = s->priv_data;
936 AVStream *st;
52a0bbff 937 int i, index;
155e9ee9
FB
938 int64_t pos;
939
940 if (!avi->index_loaded) {
941 /* we only load the index on demand */
942 avi_load_index(s);
943 avi->index_loaded = 1;
944 }
52a0bbff 945 assert(stream_index>= 0);
155e9ee9
FB
946
947 st = s->streams[stream_index];
52a0bbff
MN
948 index= av_index_search_timestamp(st, timestamp, flags);
949 if(index<0)
155e9ee9 950 return -1;
115329f1 951
155e9ee9 952 /* find the position */
52a0bbff
MN
953 pos = st->index_entries[index].pos;
954 timestamp = st->index_entries[index].timestamp;
955
949b1a13 956// av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
155e9ee9 957
6eb2de74
RS
958 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
959 /* One and only one real stream for DV in AVI, and it has video */
960 /* offsets. Calling with other stream indices should have failed */
961 /* the av_index_search_timestamp call above. */
962 assert(stream_index == 0);
963
964 /* Feed the DV video stream version of the timestamp to the */
965 /* DV demux so it can synth correct timestamps */
966 dv_offset_reset(avi->dv_demux, timestamp);
967
899681cd 968 url_fseek(s->pb, pos, SEEK_SET);
6eb2de74
RS
969 avi->stream_index= -1;
970 return 0;
971 }
972
155e9ee9 973 for(i = 0; i < s->nb_streams; i++) {
52a0bbff
MN
974 AVStream *st2 = s->streams[i];
975 AVIStream *ast2 = st2->priv_data;
7c7f3866
MN
976
977 ast2->packet_size=
978 ast2->remaining= 0;
979
52a0bbff
MN
980 if (st2->nb_index_entries <= 0)
981 continue;
115329f1 982
e84dab5f 983// assert(st2->codec->block_align);
52a0bbff
MN
984 assert(st2->time_base.den == ast2->rate);
985 assert(st2->time_base.num == ast2->scale);
986 index = av_index_search_timestamp(
115329f1 987 st2,
52a0bbff
MN
988 av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
989 flags | AVSEEK_FLAG_BACKWARD);
990 if(index<0)
991 index=0;
115329f1 992
7c7f3866
MN
993 if(!avi->non_interleaved){
994 while(index>0 && st2->index_entries[index].pos > pos)
995 index--;
996 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
997 index++;
998 }
999
949b1a13 1000// av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
52a0bbff
MN
1001 /* extract the current frame number */
1002 ast2->frame_offset = st2->index_entries[index].timestamp;
1003 if(ast2->sample_size)
1004 ast2->frame_offset *=ast2->sample_size;
155e9ee9 1005 }
52a0bbff 1006
155e9ee9 1007 /* do the seek */
899681cd 1008 url_fseek(s->pb, pos, SEEK_SET);
7c7f3866 1009 avi->stream_index= -1;
155e9ee9
FB
1010 return 0;
1011}
1012
1101abfe 1013static int avi_read_close(AVFormatContext *s)
de6d9b64 1014{
5ae2c73e
MN
1015 int i;
1016 AVIContext *avi = s->priv_data;
5ae2c73e
MN
1017
1018 for(i=0;i<s->nb_streams;i++) {
1019 AVStream *st = s->streams[i];
155e9ee9 1020 AVIStream *ast = st->priv_data;
52a0bbff 1021 av_free(ast);
01f4895c 1022 av_free(st->codec->palctrl);
5ae2c73e
MN
1023 }
1024
7458ccbb
RS
1025 if (avi->dv_demux)
1026 av_free(avi->dv_demux);
1027
c9a65ca8
FB
1028 return 0;
1029}
1030
1031static int avi_probe(AVProbeData *p)
1032{
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1033 int i;
1034
c9a65ca8 1035 /* check file header */
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1036 for(i=0; avi_headers[i][0]; i++)
1037 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1038 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1039 return AVPROBE_SCORE_MAX;
1040
1041 return 0;
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1042}
1043
ff70e601 1044AVInputFormat avi_demuxer = {
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1045 "avi",
1046 "avi format",
1047 sizeof(AVIContext),
1048 avi_probe,
1049 avi_read_header,
1050 avi_read_packet,
1051 avi_read_close,
155e9ee9 1052 avi_read_seek,
c9a65ca8 1053};