1/* 2 * AVI demuxer 3 * Copyright (c) 2001 Fabrice Bellard 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include "libavutil/intreadwrite.h" 23#include "libavutil/bswap.h" 24#include "avformat.h" 25#include "avi.h" 26#include "dv.h" 27#include "riff.h" 28 29#undef NDEBUG 30#include <assert.h> 31 32//#define DEBUG 33//#define DEBUG_SEEK 34 35typedef struct AVIStream { 36 int64_t frame_offset; /* current frame (video) or byte (audio) counter 37 (used to compute the pts) */ 38 int remaining; 39 int packet_size; 40 41 int scale; 42 int rate; 43 int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */ 44 45 int64_t cum_len; /* temporary storage (used during seek) */ 46 47 int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b' 48 int prefix_count; 49 uint32_t pal[256]; 50 int has_pal; 51} AVIStream; 52 53typedef struct { 54 int64_t riff_end; 55 int64_t movi_end; 56 int64_t fsize; 57 int64_t movi_list; 58 int64_t last_pkt_pos; 59 int index_loaded; 60 int is_odml; 61 int non_interleaved; 62 int stream_index; 63 DVDemuxContext* dv_demux; 64} AVIContext; 65 66static const char avi_headers[][8] = { 67 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' }, 68 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' }, 69 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19}, 70 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' }, 71 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' }, 72 { 0 } 73}; 74 75static int avi_load_index(AVFormatContext *s); 76static int guess_ni_flag(AVFormatContext *s); 77 78#ifdef DEBUG 79static void print_tag(const char *str, unsigned int tag, int size) 80{ 81 printf("%s: tag=%c%c%c%c size=0x%x\n", 82 str, tag & 0xff, 83 (tag >> 8) & 0xff, 84 (tag >> 16) & 0xff, 85 (tag >> 24) & 0xff, 86 size); 87} 88#endif 89 90static int get_riff(AVFormatContext *s, ByteIOContext *pb) 91{ 92 AVIContext *avi = s->priv_data; 93 char header[8]; 94 int i; 95 96 /* check RIFF header */ 97 get_buffer(pb, header, 4); 98 avi->riff_end = get_le32(pb); /* RIFF chunk size */ 99 avi->riff_end += url_ftell(pb); /* RIFF chunk end */ 100 get_buffer(pb, header+4, 4); 101 102 for(i=0; avi_headers[i][0]; i++) 103 if(!memcmp(header, avi_headers[i], 8)) 104 break; 105 if(!avi_headers[i][0]) 106 return -1; 107 108 if(header[7] == 0x19) 109 av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n"); 110 111 return 0; 112} 113 114static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){ 115 AVIContext *avi = s->priv_data; 116 ByteIOContext *pb = s->pb; 117 int longs_pre_entry= get_le16(pb); 118 int index_sub_type = get_byte(pb); 119 int index_type = get_byte(pb); 120 int entries_in_use = get_le32(pb); 121 int chunk_id = get_le32(pb); 122 int64_t base = get_le64(pb); 123 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0'); 124 AVStream *st; 125 AVIStream *ast; 126 int i; 127 int64_t last_pos= -1; 128 int64_t filesize= url_fsize(s->pb); 129 130#ifdef DEBUG_SEEK 131 av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n", 132 longs_pre_entry,index_type, entries_in_use, chunk_id, base); 133#endif 134 135 if(stream_id > s->nb_streams || stream_id < 0) 136 return -1; 137 st= s->streams[stream_id]; 138 ast = st->priv_data; 139 140 if(index_sub_type) 141 return -1; 142 143 get_le32(pb); 144 145 if(index_type && longs_pre_entry != 2) 146 return -1; 147 if(index_type>1) 148 return -1; 149 150 if(filesize > 0 && base >= filesize){ 151 av_log(s, AV_LOG_ERROR, "ODML index invalid\n"); 152 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF) 153 base &= 0xFFFFFFFF; 154 else 155 return -1; 156 } 157 158 for(i=0; i<entries_in_use; i++){ 159 if(index_type){ 160 int64_t pos= get_le32(pb) + base - 8; 161 int len = get_le32(pb); 162 int key= len >= 0; 163 len &= 0x7FFFFFFF; 164 165#ifdef DEBUG_SEEK 166 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len); 167#endif 168 if(url_feof(pb)) 169 return -1; 170 171 if(last_pos == pos || pos == base - 8) 172 avi->non_interleaved= 1; 173 if(last_pos != pos) 174 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0); 175 176 if(ast->sample_size) 177 ast->cum_len += len; 178 else 179 ast->cum_len ++; 180 last_pos= pos; 181 }else{ 182 int64_t offset, pos; 183 int duration; 184 offset = get_le64(pb); 185 get_le32(pb); /* size */ 186 duration = get_le32(pb); 187 188 if(url_feof(pb)) 189 return -1; 190 191 pos = url_ftell(pb); 192 193 url_fseek(pb, offset+8, SEEK_SET); 194 read_braindead_odml_indx(s, frame_num); 195 frame_num += duration; 196 197 url_fseek(pb, pos, SEEK_SET); 198 } 199 } 200 avi->index_loaded=1; 201 return 0; 202} 203 204static void clean_index(AVFormatContext *s){ 205 int i; 206 int64_t j; 207 208 for(i=0; i<s->nb_streams; i++){ 209 AVStream *st = s->streams[i]; 210 AVIStream *ast = st->priv_data; 211 int n= st->nb_index_entries; 212 int max= ast->sample_size; 213 int64_t pos, size, ts; 214 215 if(n != 1 || ast->sample_size==0) 216 continue; 217 218 while(max < 1024) max+=max; 219 220 pos= st->index_entries[0].pos; 221 size= st->index_entries[0].size; 222 ts= st->index_entries[0].timestamp; 223 224 for(j=0; j<size; j+=max){ 225 av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME); 226 } 227 } 228} 229 230static int avi_read_tag(AVFormatContext *s, const char *key, unsigned int size) 231{ 232 ByteIOContext *pb = s->pb; 233 uint8_t value[1024]; 234 235 int64_t i = url_ftell(pb); 236 size += (size & 1); 237 get_strz(pb, value, sizeof(value)); 238 url_fseek(pb, i+size, SEEK_SET); 239 240 return av_metadata_set(&s->metadata, key, value); 241} 242 243static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap) 244{ 245 AVIContext *avi = s->priv_data; 246 ByteIOContext *pb = s->pb; 247 unsigned int tag, tag1, handler; 248 int codec_type, stream_index, frame_period, bit_rate; 249 unsigned int size, nb_frames; 250 int i; 251 AVStream *st; 252 AVIStream *ast = NULL; 253 int avih_width=0, avih_height=0; 254 int amv_file_format=0; 255 256 avi->stream_index= -1; 257 258 if (get_riff(s, pb) < 0) 259 return -1; 260 261 avi->fsize = url_fsize(pb); 262 if(avi->fsize<=0) 263 avi->fsize= avi->riff_end; 264 265 /* first list tag */ 266 stream_index = -1; 267 codec_type = -1; 268 frame_period = 0; 269 for(;;) { 270 if (url_feof(pb)) 271 goto fail; 272 tag = get_le32(pb); 273 size = get_le32(pb); 274#ifdef DEBUG 275 print_tag("tag", tag, size); 276#endif 277 278 switch(tag) { 279 case MKTAG('L', 'I', 'S', 'T'): 280 /* Ignored, except at start of video packets. */ 281 tag1 = get_le32(pb); 282#ifdef DEBUG 283 print_tag("list", tag1, 0); 284#endif 285 if (tag1 == MKTAG('m', 'o', 'v', 'i')) { 286 avi->movi_list = url_ftell(pb) - 4; 287 if(size) avi->movi_end = avi->movi_list + size + (size & 1); 288 else avi->movi_end = url_fsize(pb); 289#ifdef DEBUG 290 printf("movi end=%"PRIx64"\n", avi->movi_end); 291#endif 292 goto end_of_header; 293 } 294 break; 295 case MKTAG('d', 'm', 'l', 'h'): 296 avi->is_odml = 1; 297 url_fskip(pb, size + (size & 1)); 298 break; 299 case MKTAG('a', 'm', 'v', 'h'): 300 amv_file_format=1; 301 case MKTAG('a', 'v', 'i', 'h'): 302 /* AVI header */ 303 /* using frame_period is bad idea */ 304 frame_period = get_le32(pb); 305 bit_rate = get_le32(pb) * 8; 306 get_le32(pb); 307 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX; 308 309 url_fskip(pb, 2 * 4); 310 get_le32(pb); 311 get_le32(pb); 312 avih_width=get_le32(pb); 313 avih_height=get_le32(pb); 314 315 url_fskip(pb, size - 10 * 4); 316 break; 317 case MKTAG('s', 't', 'r', 'h'): 318 /* stream header */ 319 320 tag1 = get_le32(pb); 321 handler = get_le32(pb); /* codec tag */ 322 323 if(tag1 == MKTAG('p', 'a', 'd', 's')){ 324 url_fskip(pb, size - 8); 325 break; 326 }else{ 327 stream_index++; 328 st = av_new_stream(s, stream_index); 329 if (!st) 330 goto fail; 331 332 ast = av_mallocz(sizeof(AVIStream)); 333 if (!ast) 334 goto fail; 335 st->priv_data = ast; 336 } 337 if(amv_file_format) 338 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s'); 339 340#ifdef DEBUG 341 print_tag("strh", tag1, -1); 342#endif 343 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){ 344 int64_t dv_dur; 345 346 /* 347 * After some consideration -- I don't think we 348 * have to support anything but DV in type1 AVIs. 349 */ 350 if (s->nb_streams != 1) 351 goto fail; 352 353 if (handler != MKTAG('d', 'v', 's', 'd') && 354 handler != MKTAG('d', 'v', 'h', 'd') && 355 handler != MKTAG('d', 'v', 's', 'l')) 356 goto fail; 357 358 ast = s->streams[0]->priv_data; 359 av_freep(&s->streams[0]->codec->extradata); 360 av_freep(&s->streams[0]); 361 s->nb_streams = 0; 362 if (CONFIG_DV_DEMUXER) { 363 avi->dv_demux = dv_init_demux(s); 364 if (!avi->dv_demux) 365 goto fail; 366 } 367 s->streams[0]->priv_data = ast; 368 url_fskip(pb, 3 * 4); 369 ast->scale = get_le32(pb); 370 ast->rate = get_le32(pb); 371 url_fskip(pb, 4); /* start time */ 372 373 dv_dur = get_le32(pb); 374 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) { 375 dv_dur *= AV_TIME_BASE; 376 s->duration = av_rescale(dv_dur, ast->scale, ast->rate); 377 } 378 /* 379 * else, leave duration alone; timing estimation in utils.c 380 * will make a guess based on bitrate. 381 */ 382 383 stream_index = s->nb_streams - 1; 384 url_fskip(pb, size - 9*4); 385 break; 386 } 387 388 assert(stream_index < s->nb_streams); 389 st->codec->stream_codec_tag= handler; 390 391 get_le32(pb); /* flags */ 392 get_le16(pb); /* priority */ 393 get_le16(pb); /* language */ 394 get_le32(pb); /* initial frame */ 395 ast->scale = get_le32(pb); 396 ast->rate = get_le32(pb); 397 if(!(ast->scale && ast->rate)){ 398 av_log(s, AV_LOG_WARNING, "scale/rate is %u/%u which is invalid. (This file has been generated by broken software.)\n", ast->scale, ast->rate); 399 if(frame_period){ 400 ast->rate = 1000000; 401 ast->scale = frame_period; 402 }else{ 403 ast->rate = 25; 404 ast->scale = 1; 405 } 406 } 407 av_set_pts_info(st, 64, ast->scale, ast->rate); 408 409 ast->cum_len=get_le32(pb); /* start */ 410 nb_frames = get_le32(pb); 411 412 st->start_time = 0; 413 st->duration = nb_frames; 414 get_le32(pb); /* buffer size */ 415 get_le32(pb); /* quality */ 416 ast->sample_size = get_le32(pb); /* sample ssize */ 417 ast->cum_len *= FFMAX(1, ast->sample_size); 418// av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size); 419 420 switch(tag1) { 421 case MKTAG('v', 'i', 'd', 's'): 422 codec_type = CODEC_TYPE_VIDEO; 423 424 ast->sample_size = 0; 425 break; 426 case MKTAG('a', 'u', 'd', 's'): 427 codec_type = CODEC_TYPE_AUDIO; 428 break; 429 case MKTAG('t', 'x', 't', 's'): 430 //FIXME 431 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME 432 break; 433 case MKTAG('d', 'a', 't', 's'): 434 codec_type = CODEC_TYPE_DATA; 435 break; 436 default: 437 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1); 438 goto fail; 439 } 440 ast->frame_offset= ast->cum_len; 441 url_fskip(pb, size - 12 * 4); 442 break; 443 case MKTAG('s', 't', 'r', 'f'): 444 /* stream header */ 445 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) { 446 url_fskip(pb, size); 447 } else { 448 st = s->streams[stream_index]; 449 switch(codec_type) { 450 case CODEC_TYPE_VIDEO: 451 if(amv_file_format){ 452 st->codec->width=avih_width; 453 st->codec->height=avih_height; 454 st->codec->codec_type = CODEC_TYPE_VIDEO; 455 st->codec->codec_id = CODEC_ID_AMV; 456 url_fskip(pb, size); 457 break; 458 } 459 get_le32(pb); /* size */ 460 st->codec->width = get_le32(pb); 461 st->codec->height = (int32_t)get_le32(pb); 462 get_le16(pb); /* panes */ 463 st->codec->bits_per_coded_sample= get_le16(pb); /* depth */ 464 tag1 = get_le32(pb); 465 get_le32(pb); /* ImageSize */ 466 get_le32(pb); /* XPelsPerMeter */ 467 get_le32(pb); /* YPelsPerMeter */ 468 get_le32(pb); /* ClrUsed */ 469 get_le32(pb); /* ClrImportant */ 470 471 if (tag1 == MKTAG('D', 'X', 'S', 'B')) { 472 st->codec->codec_type = CODEC_TYPE_SUBTITLE; 473 st->codec->codec_tag = tag1; 474 st->codec->codec_id = CODEC_ID_XSUB; 475 break; 476 } 477 478 if(size > 10*4 && size<(1<<30)){ 479 st->codec->extradata_size= size - 10*4; 480 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); 481 get_buffer(pb, st->codec->extradata, st->codec->extradata_size); 482 } 483 484 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly 485 get_byte(pb); 486 487 /* Extract palette from extradata if bpp <= 8. */ 488 /* This code assumes that extradata contains only palette. */ 489 /* This is true for all paletted codecs implemented in FFmpeg. */ 490 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) { 491 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl)); 492#ifdef WORDS_BIGENDIAN 493 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++) 494 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]); 495#else 496 memcpy(st->codec->palctrl->palette, st->codec->extradata, 497 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)); 498#endif 499 st->codec->palctrl->palette_changed = 1; 500 } 501 502#ifdef DEBUG 503 print_tag("video", tag1, 0); 504#endif 505 st->codec->codec_type = CODEC_TYPE_VIDEO; 506 st->codec->codec_tag = tag1; 507 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1); 508 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts. 509 510 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){ 511 st->codec->extradata_size+= 9; 512 st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); 513 if(st->codec->extradata) 514 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9); 515 } 516 st->codec->height= FFABS(st->codec->height); 517 518// url_fskip(pb, size - 5 * 4); 519 break; 520 case CODEC_TYPE_AUDIO: 521 get_wav_header(pb, st->codec, size); 522 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){ 523 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align); 524 ast->sample_size= st->codec->block_align; 525 } 526 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */ 527 url_fskip(pb, 1); 528 /* Force parsing as several audio frames can be in 529 * one packet and timestamps refer to packet start. */ 530 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS; 531 /* ADTS header is in extradata, AAC without header must be 532 * stored as exact frames. Parser not needed and it will 533 * fail. */ 534 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size) 535 st->need_parsing = AVSTREAM_PARSE_NONE; 536 /* AVI files with Xan DPCM audio (wrongly) declare PCM 537 * audio in the header but have Axan as stream_code_tag. */ 538 if (st->codec->stream_codec_tag == AV_RL32("Axan")){ 539 st->codec->codec_id = CODEC_ID_XAN_DPCM; 540 st->codec->codec_tag = 0; 541 } 542 if (amv_file_format) 543 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV; 544 break; 545 default: 546 st->codec->codec_type = CODEC_TYPE_DATA; 547 st->codec->codec_id= CODEC_ID_NONE; 548 st->codec->codec_tag= 0; 549 url_fskip(pb, size); 550 break; 551 } 552 } 553 break; 554 case MKTAG('i', 'n', 'd', 'x'): 555 i= url_ftell(pb); 556 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){ 557 read_braindead_odml_indx(s, 0); 558 } 559 url_fseek(pb, i+size, SEEK_SET); 560 break; 561 case MKTAG('v', 'p', 'r', 'p'): 562 if(stream_index < (unsigned)s->nb_streams && size > 9*4){ 563 AVRational active, active_aspect; 564 565 st = s->streams[stream_index]; 566 get_le32(pb); 567 get_le32(pb); 568 get_le32(pb); 569 get_le32(pb); 570 get_le32(pb); 571 572 active_aspect.den= get_le16(pb); 573 active_aspect.num= get_le16(pb); 574 active.num = get_le32(pb); 575 active.den = get_le32(pb); 576 get_le32(pb); //nbFieldsPerFrame 577 578 if(active_aspect.num && active_aspect.den && active.num && active.den){ 579 st->sample_aspect_ratio= av_div_q(active_aspect, active); 580//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den); 581 } 582 size -= 9*4; 583 } 584 url_fseek(pb, size, SEEK_CUR); 585 break; 586 case MKTAG('I', 'N', 'A', 'M'): 587 avi_read_tag(s, "Title", size); 588 break; 589 case MKTAG('I', 'A', 'R', 'T'): 590 avi_read_tag(s, "Artist", size); 591 break; 592 case MKTAG('I', 'C', 'O', 'P'): 593 avi_read_tag(s, "Copyright", size); 594 break; 595 case MKTAG('I', 'C', 'M', 'T'): 596 avi_read_tag(s, "Comment", size); 597 break; 598 case MKTAG('I', 'G', 'N', 'R'): 599 avi_read_tag(s, "Genre", size); 600 break; 601 case MKTAG('I', 'P', 'R', 'D'): 602 avi_read_tag(s, "Album", size); 603 break; 604 case MKTAG('I', 'P', 'R', 'T'): 605 avi_read_tag(s, "Track", size); 606 break; 607 default: 608 if(size > 1000000){ 609 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, " 610 "I will ignore it and try to continue anyway.\n"); 611 avi->movi_list = url_ftell(pb) - 4; 612 avi->movi_end = url_fsize(pb); 613 goto end_of_header; 614 } 615 /* skip tag */ 616 size += (size & 1); 617 url_fskip(pb, size); 618 break; 619 } 620 } 621 end_of_header: 622 /* check stream number */ 623 if (stream_index != s->nb_streams - 1) { 624 fail: 625 return -1; 626 } 627 628 if(!avi->index_loaded && !url_is_streamed(pb)) 629 avi_load_index(s); 630 avi->index_loaded = 1; 631 avi->non_interleaved |= guess_ni_flag(s); 632 if(avi->non_interleaved) { 633 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n"); 634 clean_index(s); 635 } 636 637 return 0; 638} 639 640static int get_stream_idx(int *d){ 641 if( d[0] >= '0' && d[0] <= '9' 642 && d[1] >= '0' && d[1] <= '9'){ 643 return (d[0] - '0') * 10 + (d[1] - '0'); 644 }else{ 645 return 100; //invalid stream ID 646 } 647} 648 649static int avi_read_packet(AVFormatContext *s, AVPacket *pkt) 650{ 651 AVIContext *avi = s->priv_data; 652 ByteIOContext *pb = s->pb; 653 int n, d[8]; 654 unsigned int size; 655 int64_t i, sync; 656 void* dstr; 657 658 if (CONFIG_DV_DEMUXER && avi->dv_demux) { 659 int size = dv_get_packet(avi->dv_demux, pkt); 660 if (size >= 0) 661 return size; 662 } 663 664 if(avi->non_interleaved){ 665 int best_stream_index = 0; 666 AVStream *best_st= NULL; 667 AVIStream *best_ast; 668 int64_t best_ts= INT64_MAX; 669 int i; 670 671 for(i=0; i<s->nb_streams; i++){ 672 AVStream *st = s->streams[i]; 673 AVIStream *ast = st->priv_data; 674 int64_t ts= ast->frame_offset; 675 676 if(ast->sample_size) 677 ts /= ast->sample_size; 678 ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den); 679 680// av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset); 681 if(ts < best_ts && st->nb_index_entries){ 682 best_ts= ts; 683 best_st= st; 684 best_stream_index= i; 685 } 686 } 687 if(!best_st) 688 return -1; 689 690 best_ast = best_st->priv_data; 691 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 692 if(best_ast->remaining) 693 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD); 694 else{ 695 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY); 696 if(i>=0) 697 best_ast->frame_offset= best_st->index_entries[i].timestamp 698 * FFMAX(1, best_ast->sample_size); 699 } 700 701// av_log(s, AV_LOG_DEBUG, "%d\n", i); 702 if(i>=0){ 703 int64_t pos= best_st->index_entries[i].pos; 704 pos += best_ast->packet_size - best_ast->remaining; 705 url_fseek(s->pb, pos + 8, SEEK_SET); 706// av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos); 707 708 assert(best_ast->remaining <= best_ast->packet_size); 709 710 avi->stream_index= best_stream_index; 711 if(!best_ast->remaining) 712 best_ast->packet_size= 713 best_ast->remaining= best_st->index_entries[i].size; 714 } 715 } 716 717resync: 718 if(avi->stream_index >= 0){ 719 AVStream *st= s->streams[ avi->stream_index ]; 720 AVIStream *ast= st->priv_data; 721 int size, err; 722 723 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM 724 size= INT_MAX; 725 else if(ast->sample_size < 32) 726 size= 64*ast->sample_size; 727 else 728 size= ast->sample_size; 729 730 if(size > ast->remaining) 731 size= ast->remaining; 732 avi->last_pkt_pos= url_ftell(pb); 733 err= av_get_packet(pb, pkt, size); 734 if(err<0) 735 return err; 736 737 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){ 738 void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE); 739 if(ptr){ 740 ast->has_pal=0; 741 pkt->size += 4*256; 742 pkt->data= ptr; 743 memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256); 744 }else 745 av_log(s, AV_LOG_ERROR, "Failed to append palette\n"); 746 } 747 748 if (CONFIG_DV_DEMUXER && avi->dv_demux) { 749 dstr = pkt->destruct; 750 size = dv_produce_packet(avi->dv_demux, pkt, 751 pkt->data, pkt->size); 752 pkt->destruct = dstr; 753 pkt->flags |= PKT_FLAG_KEY; 754 } else { 755 /* XXX: How to handle B-frames in AVI? */ 756 pkt->dts = ast->frame_offset; 757// pkt->dts += ast->start; 758 if(ast->sample_size) 759 pkt->dts /= ast->sample_size; 760//av_log(s, AV_LOG_DEBUG, "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d base:%d st:%d size:%d\n", pkt->dts, ast->frame_offset, ast->scale, ast->rate, ast->sample_size, AV_TIME_BASE, avi->stream_index, size); 761 pkt->stream_index = avi->stream_index; 762 763 if (st->codec->codec_type == CODEC_TYPE_VIDEO) { 764 AVIndexEntry *e; 765 int index; 766 assert(st->index_entries); 767 768 index= av_index_search_timestamp(st, pkt->dts, 0); 769 e= &st->index_entries[index]; 770 771 if(index >= 0 && e->timestamp == ast->frame_offset){ 772 if (e->flags & AVINDEX_KEYFRAME) 773 pkt->flags |= PKT_FLAG_KEY; 774 } 775 } else { 776 pkt->flags |= PKT_FLAG_KEY; 777 } 778 if(ast->sample_size) 779 ast->frame_offset += pkt->size; 780 else 781 ast->frame_offset++; 782 } 783 ast->remaining -= size; 784 if(!ast->remaining){ 785 avi->stream_index= -1; 786 ast->packet_size= 0; 787 } 788 789 return size; 790 } 791 792 memset(d, -1, sizeof(int)*8); 793 for(i=sync=url_ftell(pb); !url_feof(pb); i++) { 794 int j; 795 796 for(j=0; j<7; j++) 797 d[j]= d[j+1]; 798 d[7]= get_byte(pb); 799 800 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24); 801 802 n= get_stream_idx(d+2); 803//av_log(s, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %"PRId64" %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n); 804 if(i + (uint64_t)size > avi->fsize || d[0]<0) 805 continue; 806 807 //parse ix## 808 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) 809 //parse JUNK 810 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') 811 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){ 812 url_fskip(pb, size); 813//av_log(s, AV_LOG_DEBUG, "SKIP\n"); 814 goto resync; 815 } 816 817 n= get_stream_idx(d); 818 819 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams) 820 continue; 821 822 //parse ##dc/##wb 823 if(n < s->nb_streams){ 824 AVStream *st; 825 AVIStream *ast; 826 st = s->streams[n]; 827 ast = st->priv_data; 828 829 if(s->nb_streams>=2){ 830 AVStream *st1 = s->streams[1]; 831 AVIStream *ast1= st1->priv_data; 832 //workaround for broken small-file-bug402.avi 833 if( d[2] == 'w' && d[3] == 'b' 834 && n==0 835 && st ->codec->codec_type == CODEC_TYPE_VIDEO 836 && st1->codec->codec_type == CODEC_TYPE_AUDIO 837 && ast->prefix == 'd'*256+'c' 838 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count) 839 ){ 840 n=1; 841 st = st1; 842 ast = ast1; 843 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n"); 844 } 845 } 846 847 848 if( (st->discard >= AVDISCARD_DEFAULT && size==0) 849 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering 850 || st->discard >= AVDISCARD_ALL){ 851 if(ast->sample_size) ast->frame_offset += pkt->size; 852 else ast->frame_offset++; 853 url_fskip(pb, size); 854 goto resync; 855 } 856 857 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) { 858 int k = get_byte(pb); 859 int last = (k + get_byte(pb) - 1) & 0xFF; 860 861 get_le16(pb); //flags 862 863 for (; k <= last; k++) 864 ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16); 865 ast->has_pal= 1; 866 goto resync; 867 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) || 868 d[2]*256+d[3] == ast->prefix /*|| 869 (d[2] == 'd' && d[3] == 'c') || 870 (d[2] == 'w' && d[3] == 'b')*/) { 871 872//av_log(s, AV_LOG_DEBUG, "OK\n"); 873 if(d[2]*256+d[3] == ast->prefix) 874 ast->prefix_count++; 875 else{ 876 ast->prefix= d[2]*256+d[3]; 877 ast->prefix_count= 0; 878 } 879 880 avi->stream_index= n; 881 ast->packet_size= size + 8; 882 ast->remaining= size; 883 884 { 885 uint64_t pos= url_ftell(pb) - 8; 886 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){ 887 av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME); 888 } 889 } 890 goto resync; 891 } 892 } 893 } 894 895 return AVERROR_EOF; 896} 897 898/* XXX: We make the implicit supposition that the positions are sorted 899 for each stream. */ 900static int avi_read_idx1(AVFormatContext *s, int size) 901{ 902 AVIContext *avi = s->priv_data; 903 ByteIOContext *pb = s->pb; 904 int nb_index_entries, i; 905 AVStream *st; 906 AVIStream *ast; 907 unsigned int index, tag, flags, pos, len; 908 unsigned last_pos= -1; 909 910 nb_index_entries = size / 16; 911 if (nb_index_entries <= 0) 912 return -1; 913 914 /* Read the entries and sort them in each stream component. */ 915 for(i = 0; i < nb_index_entries; i++) { 916 tag = get_le32(pb); 917 flags = get_le32(pb); 918 pos = get_le32(pb); 919 len = get_le32(pb); 920#if defined(DEBUG_SEEK) 921 av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/", 922 i, tag, flags, pos, len); 923#endif 924 if(i==0 && pos > avi->movi_list) 925 avi->movi_list= 0; //FIXME better check 926 pos += avi->movi_list; 927 928 index = ((tag & 0xff) - '0') * 10; 929 index += ((tag >> 8) & 0xff) - '0'; 930 if (index >= s->nb_streams) 931 continue; 932 st = s->streams[index]; 933 ast = st->priv_data; 934 935#if defined(DEBUG_SEEK) 936 av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len); 937#endif 938 if(url_feof(pb)) 939 return -1; 940 941 if(last_pos == pos) 942 avi->non_interleaved= 1; 943 else 944 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0); 945 if(ast->sample_size) 946 ast->cum_len += len; 947 else 948 ast->cum_len ++; 949 last_pos= pos; 950 } 951 return 0; 952} 953 954static int guess_ni_flag(AVFormatContext *s){ 955 int i; 956 int64_t last_start=0; 957 int64_t first_end= INT64_MAX; 958 959 for(i=0; i<s->nb_streams; i++){ 960 AVStream *st = s->streams[i]; 961 int n= st->nb_index_entries; 962 963 if(n <= 0) 964 continue; 965 966 if(st->index_entries[0].pos > last_start) 967 last_start= st->index_entries[0].pos; 968 if(st->index_entries[n-1].pos < first_end) 969 first_end= st->index_entries[n-1].pos; 970 } 971 return last_start > first_end; 972} 973 974static int avi_load_index(AVFormatContext *s) 975{ 976 AVIContext *avi = s->priv_data; 977 ByteIOContext *pb = s->pb; 978 uint32_t tag, size; 979 int64_t pos= url_ftell(pb); 980 981 url_fseek(pb, avi->movi_end, SEEK_SET); 982#ifdef DEBUG_SEEK 983 printf("movi_end=0x%"PRIx64"\n", avi->movi_end); 984#endif 985 for(;;) { 986 if (url_feof(pb)) 987 break; 988 tag = get_le32(pb); 989 size = get_le32(pb); 990#ifdef DEBUG_SEEK 991 printf("tag=%c%c%c%c size=0x%x\n", 992 tag & 0xff, 993 (tag >> 8) & 0xff, 994 (tag >> 16) & 0xff, 995 (tag >> 24) & 0xff, 996 size); 997#endif 998 switch(tag) { 999 case MKTAG('i', 'd', 'x', '1'): 1000 if (avi_read_idx1(s, size) < 0) 1001 goto skip; 1002 else 1003 goto the_end; 1004 break; 1005 default: 1006 skip: 1007 size += (size & 1); 1008 url_fskip(pb, size); 1009 break; 1010 } 1011 } 1012 the_end: 1013 url_fseek(pb, pos, SEEK_SET); 1014 return 0; 1015} 1016 1017static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) 1018{ 1019 AVIContext *avi = s->priv_data; 1020 AVStream *st; 1021 int i, index; 1022 int64_t pos; 1023 1024 if (!avi->index_loaded) { 1025 /* we only load the index on demand */ 1026 avi_load_index(s); 1027 avi->index_loaded = 1; 1028 } 1029 assert(stream_index>= 0); 1030 1031 st = s->streams[stream_index]; 1032 index= av_index_search_timestamp(st, timestamp, flags); 1033 if(index<0) 1034 return -1; 1035 1036 /* find the position */ 1037 pos = st->index_entries[index].pos; 1038 timestamp = st->index_entries[index].timestamp; 1039 1040// av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp); 1041 1042 if (CONFIG_DV_DEMUXER && avi->dv_demux) { 1043 /* One and only one real stream for DV in AVI, and it has video */ 1044 /* offsets. Calling with other stream indexes should have failed */ 1045 /* the av_index_search_timestamp call above. */ 1046 assert(stream_index == 0); 1047 1048 /* Feed the DV video stream version of the timestamp to the */ 1049 /* DV demux so it can synthesize correct timestamps. */ 1050 dv_offset_reset(avi->dv_demux, timestamp); 1051 1052 url_fseek(s->pb, pos, SEEK_SET); 1053 avi->stream_index= -1; 1054 return 0; 1055 } 1056 1057 for(i = 0; i < s->nb_streams; i++) { 1058 AVStream *st2 = s->streams[i]; 1059 AVIStream *ast2 = st2->priv_data; 1060 1061 ast2->packet_size= 1062 ast2->remaining= 0; 1063 1064 if (st2->nb_index_entries <= 0) 1065 continue; 1066 1067// assert(st2->codec->block_align); 1068 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale); 1069 index = av_index_search_timestamp( 1070 st2, 1071 av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num), 1072 flags | AVSEEK_FLAG_BACKWARD); 1073 if(index<0) 1074 index=0; 1075 1076 if(!avi->non_interleaved){ 1077 while(index>0 && st2->index_entries[index].pos > pos) 1078 index--; 1079 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos) 1080 index++; 1081 } 1082 1083// av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp); 1084 /* extract the current frame number */ 1085 ast2->frame_offset = st2->index_entries[index].timestamp; 1086 if(ast2->sample_size) 1087 ast2->frame_offset *=ast2->sample_size; 1088 } 1089 1090 /* do the seek */ 1091 url_fseek(s->pb, pos, SEEK_SET); 1092 avi->stream_index= -1; 1093 return 0; 1094} 1095 1096static int avi_read_close(AVFormatContext *s) 1097{ 1098 int i; 1099 AVIContext *avi = s->priv_data; 1100 1101 for(i=0;i<s->nb_streams;i++) { 1102 AVStream *st = s->streams[i]; 1103 av_free(st->codec->palctrl); 1104 } 1105 1106 if (avi->dv_demux) 1107 av_free(avi->dv_demux); 1108 1109 return 0; 1110} 1111 1112static int avi_probe(AVProbeData *p) 1113{ 1114 int i; 1115 1116 /* check file header */ 1117 for(i=0; avi_headers[i][0]; i++) 1118 if(!memcmp(p->buf , avi_headers[i] , 4) && 1119 !memcmp(p->buf+8, avi_headers[i]+4, 4)) 1120 return AVPROBE_SCORE_MAX; 1121 1122 return 0; 1123} 1124 1125AVInputFormat avi_demuxer = { 1126 "avi", 1127 NULL_IF_CONFIG_SMALL("AVI format"), 1128 sizeof(AVIContext), 1129 avi_probe, 1130 avi_read_header, 1131 avi_read_packet, 1132 avi_read_close, 1133 avi_read_seek, 1134}; 1135