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//#define DEBUG 23//#define DEBUG_SEEK 24 25#include "libavutil/intreadwrite.h" 26#include "libavutil/bswap.h" 27#include "avformat.h" 28#include "avi.h" 29#include "dv.h" 30#include "riff.h" 31 32#undef NDEBUG 33#include <assert.h> 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 dprintf(NULL, "%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 && (len || !ast->sample_size)) 174 av_add_index_entry(st, pos, ast->cum_len, 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, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME); 226 } 227 } 228} 229 230static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size) 231{ 232 ByteIOContext *pb = s->pb; 233 char key[5] = {0}, *value; 234 235 size += (size & 1); 236 237 if (size == UINT_MAX) 238 return -1; 239 value = av_malloc(size+1); 240 if (!value) 241 return -1; 242 get_buffer(pb, value, size); 243 value[size]=0; 244 245 AV_WL32(key, tag); 246 247 if(st) 248 return av_metadata_set2(&st->metadata, key, value, 249 AV_METADATA_DONT_STRDUP_VAL); 250 else 251 return av_metadata_set2(&s->metadata, key, value, 252 AV_METADATA_DONT_STRDUP_VAL); 253} 254 255static void avi_read_info(AVFormatContext *s, uint64_t end) 256{ 257 while (url_ftell(s->pb) < end) { 258 uint32_t tag = get_le32(s->pb); 259 uint32_t size = get_le32(s->pb); 260 avi_read_tag(s, NULL, tag, size); 261 } 262} 263 264static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap) 265{ 266 AVIContext *avi = s->priv_data; 267 ByteIOContext *pb = s->pb; 268 unsigned int tag, tag1, handler; 269 int codec_type, stream_index, frame_period, bit_rate; 270 unsigned int size; 271 int i; 272 AVStream *st; 273 AVIStream *ast = NULL; 274 int avih_width=0, avih_height=0; 275 int amv_file_format=0; 276 uint64_t list_end = 0; 277 278 avi->stream_index= -1; 279 280 if (get_riff(s, pb) < 0) 281 return -1; 282 283 avi->fsize = url_fsize(pb); 284 if(avi->fsize<=0) 285 avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end; 286 287 /* first list tag */ 288 stream_index = -1; 289 codec_type = -1; 290 frame_period = 0; 291 for(;;) { 292 if (url_feof(pb)) 293 goto fail; 294 tag = get_le32(pb); 295 size = get_le32(pb); 296#ifdef DEBUG 297 print_tag("tag", tag, size); 298#endif 299 300 switch(tag) { 301 case MKTAG('L', 'I', 'S', 'T'): 302 list_end = url_ftell(pb) + size; 303 /* Ignored, except at start of video packets. */ 304 tag1 = get_le32(pb); 305#ifdef DEBUG 306 print_tag("list", tag1, 0); 307#endif 308 if (tag1 == MKTAG('m', 'o', 'v', 'i')) { 309 avi->movi_list = url_ftell(pb) - 4; 310 if(size) avi->movi_end = avi->movi_list + size + (size & 1); 311 else avi->movi_end = url_fsize(pb); 312 dprintf(NULL, "movi end=%"PRIx64"\n", avi->movi_end); 313 goto end_of_header; 314 } 315 else if (tag1 == MKTAG('I', 'N', 'F', 'O')) 316 avi_read_info(s, list_end); 317 318 break; 319 case MKTAG('d', 'm', 'l', 'h'): 320 avi->is_odml = 1; 321 url_fskip(pb, size + (size & 1)); 322 break; 323 case MKTAG('a', 'm', 'v', 'h'): 324 amv_file_format=1; 325 case MKTAG('a', 'v', 'i', 'h'): 326 /* AVI header */ 327 /* using frame_period is bad idea */ 328 frame_period = get_le32(pb); 329 bit_rate = get_le32(pb) * 8; 330 get_le32(pb); 331 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX; 332 333 url_fskip(pb, 2 * 4); 334 get_le32(pb); 335 get_le32(pb); 336 avih_width=get_le32(pb); 337 avih_height=get_le32(pb); 338 339 url_fskip(pb, size - 10 * 4); 340 break; 341 case MKTAG('s', 't', 'r', 'h'): 342 /* stream header */ 343 344 tag1 = get_le32(pb); 345 handler = get_le32(pb); /* codec tag */ 346 347 if(tag1 == MKTAG('p', 'a', 'd', 's')){ 348 url_fskip(pb, size - 8); 349 break; 350 }else{ 351 stream_index++; 352 st = av_new_stream(s, stream_index); 353 if (!st) 354 goto fail; 355 356 ast = av_mallocz(sizeof(AVIStream)); 357 if (!ast) 358 goto fail; 359 st->priv_data = ast; 360 } 361 if(amv_file_format) 362 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s'); 363 364#ifdef DEBUG 365 print_tag("strh", tag1, -1); 366#endif 367 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){ 368 int64_t dv_dur; 369 370 /* 371 * After some consideration -- I don't think we 372 * have to support anything but DV in type1 AVIs. 373 */ 374 if (s->nb_streams != 1) 375 goto fail; 376 377 if (handler != MKTAG('d', 'v', 's', 'd') && 378 handler != MKTAG('d', 'v', 'h', 'd') && 379 handler != MKTAG('d', 'v', 's', 'l')) 380 goto fail; 381 382 ast = s->streams[0]->priv_data; 383 av_freep(&s->streams[0]->codec->extradata); 384 av_freep(&s->streams[0]); 385 s->nb_streams = 0; 386 if (CONFIG_DV_DEMUXER) { 387 avi->dv_demux = dv_init_demux(s); 388 if (!avi->dv_demux) 389 goto fail; 390 } 391 s->streams[0]->priv_data = ast; 392 url_fskip(pb, 3 * 4); 393 ast->scale = get_le32(pb); 394 ast->rate = get_le32(pb); 395 url_fskip(pb, 4); /* start time */ 396 397 dv_dur = get_le32(pb); 398 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) { 399 dv_dur *= AV_TIME_BASE; 400 s->duration = av_rescale(dv_dur, ast->scale, ast->rate); 401 } 402 /* 403 * else, leave duration alone; timing estimation in utils.c 404 * will make a guess based on bitrate. 405 */ 406 407 stream_index = s->nb_streams - 1; 408 url_fskip(pb, size - 9*4); 409 break; 410 } 411 412 assert(stream_index < s->nb_streams); 413 st->codec->stream_codec_tag= handler; 414 415 get_le32(pb); /* flags */ 416 get_le16(pb); /* priority */ 417 get_le16(pb); /* language */ 418 get_le32(pb); /* initial frame */ 419 ast->scale = get_le32(pb); 420 ast->rate = get_le32(pb); 421 if(!(ast->scale && ast->rate)){ 422 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); 423 if(frame_period){ 424 ast->rate = 1000000; 425 ast->scale = frame_period; 426 }else{ 427 ast->rate = 25; 428 ast->scale = 1; 429 } 430 } 431 av_set_pts_info(st, 64, ast->scale, ast->rate); 432 433 ast->cum_len=get_le32(pb); /* start */ 434 st->nb_frames = get_le32(pb); 435 436 st->start_time = 0; 437 get_le32(pb); /* buffer size */ 438 get_le32(pb); /* quality */ 439 ast->sample_size = get_le32(pb); /* sample ssize */ 440 ast->cum_len *= FFMAX(1, ast->sample_size); 441// av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size); 442 443 switch(tag1) { 444 case MKTAG('v', 'i', 'd', 's'): 445 codec_type = AVMEDIA_TYPE_VIDEO; 446 447 ast->sample_size = 0; 448 break; 449 case MKTAG('a', 'u', 'd', 's'): 450 codec_type = AVMEDIA_TYPE_AUDIO; 451 break; 452 case MKTAG('t', 'x', 't', 's'): 453 //FIXME 454 codec_type = AVMEDIA_TYPE_DATA; //AVMEDIA_TYPE_SUB ? FIXME 455 break; 456 case MKTAG('d', 'a', 't', 's'): 457 codec_type = AVMEDIA_TYPE_DATA; 458 break; 459 default: 460 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1); 461 goto fail; 462 } 463 if(ast->sample_size == 0) 464 st->duration = st->nb_frames; 465 ast->frame_offset= ast->cum_len; 466 url_fskip(pb, size - 12 * 4); 467 break; 468 case MKTAG('s', 't', 'r', 'f'): 469 /* stream header */ 470 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) { 471 url_fskip(pb, size); 472 } else { 473 uint64_t cur_pos = url_ftell(pb); 474 if (cur_pos < list_end) 475 size = FFMIN(size, list_end - cur_pos); 476 st = s->streams[stream_index]; 477 switch(codec_type) { 478 case AVMEDIA_TYPE_VIDEO: 479 if(amv_file_format){ 480 st->codec->width=avih_width; 481 st->codec->height=avih_height; 482 st->codec->codec_type = AVMEDIA_TYPE_VIDEO; 483 st->codec->codec_id = CODEC_ID_AMV; 484 url_fskip(pb, size); 485 break; 486 } 487 get_le32(pb); /* size */ 488 st->codec->width = get_le32(pb); 489 st->codec->height = (int32_t)get_le32(pb); 490 get_le16(pb); /* panes */ 491 st->codec->bits_per_coded_sample= get_le16(pb); /* depth */ 492 tag1 = get_le32(pb); 493 get_le32(pb); /* ImageSize */ 494 get_le32(pb); /* XPelsPerMeter */ 495 get_le32(pb); /* YPelsPerMeter */ 496 get_le32(pb); /* ClrUsed */ 497 get_le32(pb); /* ClrImportant */ 498 499 if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) { 500 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; 501 st->codec->codec_tag = tag1; 502 st->codec->codec_id = CODEC_ID_XSUB; 503 break; 504 } 505 506 if(size > 10*4 && size<(1<<30)){ 507 st->codec->extradata_size= size - 10*4; 508 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); 509 if (!st->codec->extradata) { 510 st->codec->extradata_size= 0; 511 return AVERROR(ENOMEM); 512 } 513 get_buffer(pb, st->codec->extradata, st->codec->extradata_size); 514 } 515 516 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly 517 get_byte(pb); 518 519 /* Extract palette from extradata if bpp <= 8. */ 520 /* This code assumes that extradata contains only palette. */ 521 /* This is true for all paletted codecs implemented in FFmpeg. */ 522 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) { 523 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl)); 524#if HAVE_BIGENDIAN 525 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++) 526 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]); 527#else 528 memcpy(st->codec->palctrl->palette, st->codec->extradata, 529 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)); 530#endif 531 st->codec->palctrl->palette_changed = 1; 532 } 533 534#ifdef DEBUG 535 print_tag("video", tag1, 0); 536#endif 537 st->codec->codec_type = AVMEDIA_TYPE_VIDEO; 538 st->codec->codec_tag = tag1; 539 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1); 540 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts. 541 // Support "Resolution 1:1" for Avid AVI Codec 542 if(tag1 == MKTAG('A', 'V', 'R', 'n') && 543 st->codec->extradata_size >= 31 && 544 !memcmp(&st->codec->extradata[28], "1:1", 3)) 545 st->codec->codec_id = CODEC_ID_RAWVIDEO; 546 547 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){ 548 st->codec->extradata_size+= 9; 549 st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); 550 if(st->codec->extradata) 551 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9); 552 } 553 st->codec->height= FFABS(st->codec->height); 554 555// url_fskip(pb, size - 5 * 4); 556 break; 557 case AVMEDIA_TYPE_AUDIO: 558 ff_get_wav_header(pb, st->codec, size); 559 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){ 560 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align); 561 ast->sample_size= st->codec->block_align; 562 } 563 if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */ 564 url_fskip(pb, 1); 565 /* Force parsing as several audio frames can be in 566 * one packet and timestamps refer to packet start. */ 567 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS; 568 /* ADTS header is in extradata, AAC without header must be 569 * stored as exact frames. Parser not needed and it will 570 * fail. */ 571 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size) 572 st->need_parsing = AVSTREAM_PARSE_NONE; 573 /* AVI files with Xan DPCM audio (wrongly) declare PCM 574 * audio in the header but have Axan as stream_code_tag. */ 575 if (st->codec->stream_codec_tag == AV_RL32("Axan")){ 576 st->codec->codec_id = CODEC_ID_XAN_DPCM; 577 st->codec->codec_tag = 0; 578 } 579 if (amv_file_format) 580 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV; 581 break; 582 default: 583 st->codec->codec_type = AVMEDIA_TYPE_DATA; 584 st->codec->codec_id= CODEC_ID_NONE; 585 st->codec->codec_tag= 0; 586 url_fskip(pb, size); 587 break; 588 } 589 } 590 break; 591 case MKTAG('i', 'n', 'd', 'x'): 592 i= url_ftell(pb); 593 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){ 594 read_braindead_odml_indx(s, 0); 595 } 596 url_fseek(pb, i+size, SEEK_SET); 597 break; 598 case MKTAG('v', 'p', 'r', 'p'): 599 if(stream_index < (unsigned)s->nb_streams && size > 9*4){ 600 AVRational active, active_aspect; 601 602 st = s->streams[stream_index]; 603 get_le32(pb); 604 get_le32(pb); 605 get_le32(pb); 606 get_le32(pb); 607 get_le32(pb); 608 609 active_aspect.den= get_le16(pb); 610 active_aspect.num= get_le16(pb); 611 active.num = get_le32(pb); 612 active.den = get_le32(pb); 613 get_le32(pb); //nbFieldsPerFrame 614 615 if(active_aspect.num && active_aspect.den && active.num && active.den){ 616 st->sample_aspect_ratio= av_div_q(active_aspect, active); 617//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den); 618 } 619 size -= 9*4; 620 } 621 url_fseek(pb, size, SEEK_CUR); 622 break; 623 case MKTAG('s', 't', 'r', 'n'): 624 if(s->nb_streams){ 625 avi_read_tag(s, s->streams[s->nb_streams-1], tag, size); 626 break; 627 } 628 default: 629 if(size > 1000000){ 630 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, " 631 "I will ignore it and try to continue anyway.\n"); 632 avi->movi_list = url_ftell(pb) - 4; 633 avi->movi_end = url_fsize(pb); 634 goto end_of_header; 635 } 636 /* skip tag */ 637 size += (size & 1); 638 url_fskip(pb, size); 639 break; 640 } 641 } 642 end_of_header: 643 /* check stream number */ 644 if (stream_index != s->nb_streams - 1) { 645 fail: 646 return -1; 647 } 648 649 if(!avi->index_loaded && !url_is_streamed(pb)) 650 avi_load_index(s); 651 avi->index_loaded = 1; 652 avi->non_interleaved |= guess_ni_flag(s); 653 for(i=0; i<s->nb_streams; i++){ 654 AVStream *st = s->streams[i]; 655 if(st->nb_index_entries) 656 break; 657 } 658 if(i==s->nb_streams && avi->non_interleaved) { 659 av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n"); 660 avi->non_interleaved=0; 661 } 662 663 if(avi->non_interleaved) { 664 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n"); 665 clean_index(s); 666 } 667 668 return 0; 669} 670 671static int get_stream_idx(int *d){ 672 if( d[0] >= '0' && d[0] <= '9' 673 && d[1] >= '0' && d[1] <= '9'){ 674 return (d[0] - '0') * 10 + (d[1] - '0'); 675 }else{ 676 return 100; //invalid stream ID 677 } 678} 679 680static int avi_read_packet(AVFormatContext *s, AVPacket *pkt) 681{ 682 AVIContext *avi = s->priv_data; 683 ByteIOContext *pb = s->pb; 684 int n, d[8]; 685 unsigned int size; 686 int64_t i, sync; 687 void* dstr; 688 689 if (CONFIG_DV_DEMUXER && avi->dv_demux) { 690 int size = dv_get_packet(avi->dv_demux, pkt); 691 if (size >= 0) 692 return size; 693 } 694 695 if(avi->non_interleaved){ 696 int best_stream_index = 0; 697 AVStream *best_st= NULL; 698 AVIStream *best_ast; 699 int64_t best_ts= INT64_MAX; 700 int i; 701 702 for(i=0; i<s->nb_streams; i++){ 703 AVStream *st = s->streams[i]; 704 AVIStream *ast = st->priv_data; 705 int64_t ts= ast->frame_offset; 706 int64_t last_ts; 707 708 if(!st->nb_index_entries) 709 continue; 710 711 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp; 712 if(!ast->remaining && ts > last_ts) 713 continue; 714 715 ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE}); 716 717// av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset); 718 if(ts < best_ts){ 719 best_ts= ts; 720 best_st= st; 721 best_stream_index= i; 722 } 723 } 724 if(!best_st) 725 return -1; 726 727 best_ast = best_st->priv_data; 728 best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base); 729 if(best_ast->remaining) 730 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD); 731 else{ 732 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY); 733 if(i>=0) 734 best_ast->frame_offset= best_st->index_entries[i].timestamp; 735 } 736 737// av_log(s, AV_LOG_DEBUG, "%d\n", i); 738 if(i>=0){ 739 int64_t pos= best_st->index_entries[i].pos; 740 pos += best_ast->packet_size - best_ast->remaining; 741 url_fseek(s->pb, pos + 8, SEEK_SET); 742// av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos); 743 744 assert(best_ast->remaining <= best_ast->packet_size); 745 746 avi->stream_index= best_stream_index; 747 if(!best_ast->remaining) 748 best_ast->packet_size= 749 best_ast->remaining= best_st->index_entries[i].size; 750 } 751 } 752 753resync: 754 if(avi->stream_index >= 0){ 755 AVStream *st= s->streams[ avi->stream_index ]; 756 AVIStream *ast= st->priv_data; 757 int size, err; 758 759 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM 760 size= INT_MAX; 761 else if(ast->sample_size < 32) 762 // arbitrary multiplier to avoid tiny packets for raw PCM data 763 size= 1024*ast->sample_size; 764 else 765 size= ast->sample_size; 766 767 if(size > ast->remaining) 768 size= ast->remaining; 769 avi->last_pkt_pos= url_ftell(pb); 770 err= av_get_packet(pb, pkt, size); 771 if(err<0) 772 return err; 773 774 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){ 775 void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE); 776 if(ptr){ 777 ast->has_pal=0; 778 pkt->size += 4*256; 779 pkt->data= ptr; 780 memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256); 781 }else 782 av_log(s, AV_LOG_ERROR, "Failed to append palette\n"); 783 } 784 785 if (CONFIG_DV_DEMUXER && avi->dv_demux) { 786 dstr = pkt->destruct; 787 size = dv_produce_packet(avi->dv_demux, pkt, 788 pkt->data, pkt->size); 789 pkt->destruct = dstr; 790 pkt->flags |= AV_PKT_FLAG_KEY; 791 } else { 792 /* XXX: How to handle B-frames in AVI? */ 793 pkt->dts = ast->frame_offset; 794// pkt->dts += ast->start; 795 if(ast->sample_size) 796 pkt->dts /= ast->sample_size; 797//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); 798 pkt->stream_index = avi->stream_index; 799 800 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) { 801 AVIndexEntry *e; 802 int index; 803 assert(st->index_entries); 804 805 index= av_index_search_timestamp(st, ast->frame_offset, 0); 806 e= &st->index_entries[index]; 807 808 if(index >= 0 && e->timestamp == ast->frame_offset){ 809 if (e->flags & AVINDEX_KEYFRAME) 810 pkt->flags |= AV_PKT_FLAG_KEY; 811 } 812 } else { 813 pkt->flags |= AV_PKT_FLAG_KEY; 814 } 815 if(ast->sample_size) 816 ast->frame_offset += pkt->size; 817 else 818 ast->frame_offset++; 819 } 820 ast->remaining -= size; 821 if(!ast->remaining){ 822 avi->stream_index= -1; 823 ast->packet_size= 0; 824 } 825 826 return size; 827 } 828 829 memset(d, -1, sizeof(int)*8); 830 for(i=sync=url_ftell(pb); !url_feof(pb); i++) { 831 int j; 832 833 for(j=0; j<7; j++) 834 d[j]= d[j+1]; 835 d[7]= get_byte(pb); 836 837 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24); 838 839 n= get_stream_idx(d+2); 840//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); 841 if(i + (uint64_t)size > avi->fsize || d[0]<0) 842 continue; 843 844 //parse ix## 845 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) 846 //parse JUNK 847 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') 848 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){ 849 url_fskip(pb, size); 850//av_log(s, AV_LOG_DEBUG, "SKIP\n"); 851 goto resync; 852 } 853 854 //parse stray LIST 855 if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){ 856 url_fskip(pb, 4); 857 goto resync; 858 } 859 860 n= get_stream_idx(d); 861 862 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams) 863 continue; 864 865 //detect ##ix chunk and skip 866 if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){ 867 url_fskip(pb, size); 868 goto resync; 869 } 870 871 //parse ##dc/##wb 872 if(n < s->nb_streams){ 873 AVStream *st; 874 AVIStream *ast; 875 st = s->streams[n]; 876 ast = st->priv_data; 877 878 if(s->nb_streams>=2){ 879 AVStream *st1 = s->streams[1]; 880 AVIStream *ast1= st1->priv_data; 881 //workaround for broken small-file-bug402.avi 882 if( d[2] == 'w' && d[3] == 'b' 883 && n==0 884 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO 885 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO 886 && ast->prefix == 'd'*256+'c' 887 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count) 888 ){ 889 n=1; 890 st = st1; 891 ast = ast1; 892 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n"); 893 } 894 } 895 896 897 if( (st->discard >= AVDISCARD_DEFAULT && size==0) 898 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering 899 || st->discard >= AVDISCARD_ALL){ 900 if(ast->sample_size) ast->frame_offset += size; 901 else ast->frame_offset++; 902 url_fskip(pb, size); 903 goto resync; 904 } 905 906 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) { 907 int k = get_byte(pb); 908 int last = (k + get_byte(pb) - 1) & 0xFF; 909 910 get_le16(pb); //flags 911 912 for (; k <= last; k++) 913 ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16); 914 ast->has_pal= 1; 915 goto resync; 916 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) || 917 d[2]*256+d[3] == ast->prefix /*|| 918 (d[2] == 'd' && d[3] == 'c') || 919 (d[2] == 'w' && d[3] == 'b')*/) { 920 921//av_log(s, AV_LOG_DEBUG, "OK\n"); 922 if(d[2]*256+d[3] == ast->prefix) 923 ast->prefix_count++; 924 else{ 925 ast->prefix= d[2]*256+d[3]; 926 ast->prefix_count= 0; 927 } 928 929 avi->stream_index= n; 930 ast->packet_size= size + 8; 931 ast->remaining= size; 932 933 if(size || !ast->sample_size){ 934 uint64_t pos= url_ftell(pb) - 8; 935 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){ 936 av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME); 937 } 938 } 939 goto resync; 940 } 941 } 942 } 943 944 return AVERROR_EOF; 945} 946 947/* XXX: We make the implicit supposition that the positions are sorted 948 for each stream. */ 949static int avi_read_idx1(AVFormatContext *s, int size) 950{ 951 AVIContext *avi = s->priv_data; 952 ByteIOContext *pb = s->pb; 953 int nb_index_entries, i; 954 AVStream *st; 955 AVIStream *ast; 956 unsigned int index, tag, flags, pos, len; 957 unsigned last_pos= -1; 958 959 nb_index_entries = size / 16; 960 if (nb_index_entries <= 0) 961 return -1; 962 963 /* Read the entries and sort them in each stream component. */ 964 for(i = 0; i < nb_index_entries; i++) { 965 tag = get_le32(pb); 966 flags = get_le32(pb); 967 pos = get_le32(pb); 968 len = get_le32(pb); 969#if defined(DEBUG_SEEK) 970 av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/", 971 i, tag, flags, pos, len); 972#endif 973 if(i==0 && pos > avi->movi_list) 974 avi->movi_list= 0; //FIXME better check 975 pos += avi->movi_list; 976 977 index = ((tag & 0xff) - '0') * 10; 978 index += ((tag >> 8) & 0xff) - '0'; 979 if (index >= s->nb_streams) 980 continue; 981 st = s->streams[index]; 982 ast = st->priv_data; 983 984#if defined(DEBUG_SEEK) 985 av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len); 986#endif 987 if(url_feof(pb)) 988 return -1; 989 990 if(last_pos == pos) 991 avi->non_interleaved= 1; 992 else if(len || !ast->sample_size) 993 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0); 994 if(ast->sample_size) 995 ast->cum_len += len; 996 else 997 ast->cum_len ++; 998 last_pos= pos; 999 } 1000 return 0; 1001} 1002 1003static int guess_ni_flag(AVFormatContext *s){ 1004 int i; 1005 int64_t last_start=0; 1006 int64_t first_end= INT64_MAX; 1007 int64_t oldpos= url_ftell(s->pb); 1008 1009 for(i=0; i<s->nb_streams; i++){ 1010 AVStream *st = s->streams[i]; 1011 int n= st->nb_index_entries; 1012 unsigned int size; 1013 1014 if(n <= 0) 1015 continue; 1016 1017 if(n >= 2){ 1018 int64_t pos= st->index_entries[0].pos; 1019 url_fseek(s->pb, pos + 4, SEEK_SET); 1020 size= get_le32(s->pb); 1021 if(pos + size > st->index_entries[1].pos) 1022 last_start= INT64_MAX; 1023 } 1024 1025 if(st->index_entries[0].pos > last_start) 1026 last_start= st->index_entries[0].pos; 1027 if(st->index_entries[n-1].pos < first_end) 1028 first_end= st->index_entries[n-1].pos; 1029 } 1030 url_fseek(s->pb, oldpos, SEEK_SET); 1031 return last_start > first_end; 1032} 1033 1034static int avi_load_index(AVFormatContext *s) 1035{ 1036 AVIContext *avi = s->priv_data; 1037 ByteIOContext *pb = s->pb; 1038 uint32_t tag, size; 1039 int64_t pos= url_ftell(pb); 1040 int ret = -1; 1041 1042 if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0) 1043 goto the_end; // maybe truncated file 1044#ifdef DEBUG_SEEK 1045 printf("movi_end=0x%"PRIx64"\n", avi->movi_end); 1046#endif 1047 for(;;) { 1048 if (url_feof(pb)) 1049 break; 1050 tag = get_le32(pb); 1051 size = get_le32(pb); 1052#ifdef DEBUG_SEEK 1053 printf("tag=%c%c%c%c size=0x%x\n", 1054 tag & 0xff, 1055 (tag >> 8) & 0xff, 1056 (tag >> 16) & 0xff, 1057 (tag >> 24) & 0xff, 1058 size); 1059#endif 1060 switch(tag) { 1061 case MKTAG('i', 'd', 'x', '1'): 1062 if (avi_read_idx1(s, size) < 0) 1063 goto skip; 1064 ret = 0; 1065 goto the_end; 1066 break; 1067 default: 1068 skip: 1069 size += (size & 1); 1070 if (url_fseek(pb, size, SEEK_CUR) < 0) 1071 goto the_end; // something is wrong here 1072 break; 1073 } 1074 } 1075 the_end: 1076 url_fseek(pb, pos, SEEK_SET); 1077 return ret; 1078} 1079 1080static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) 1081{ 1082 AVIContext *avi = s->priv_data; 1083 AVStream *st; 1084 int i, index; 1085 int64_t pos; 1086 AVIStream *ast; 1087 1088 if (!avi->index_loaded) { 1089 /* we only load the index on demand */ 1090 avi_load_index(s); 1091 avi->index_loaded = 1; 1092 } 1093 assert(stream_index>= 0); 1094 1095 st = s->streams[stream_index]; 1096 ast= st->priv_data; 1097 index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags); 1098 if(index<0) 1099 return -1; 1100 1101 /* find the position */ 1102 pos = st->index_entries[index].pos; 1103 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1); 1104 1105// av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp); 1106 1107 if (CONFIG_DV_DEMUXER && avi->dv_demux) { 1108 /* One and only one real stream for DV in AVI, and it has video */ 1109 /* offsets. Calling with other stream indexes should have failed */ 1110 /* the av_index_search_timestamp call above. */ 1111 assert(stream_index == 0); 1112 1113 /* Feed the DV video stream version of the timestamp to the */ 1114 /* DV demux so it can synthesize correct timestamps. */ 1115 dv_offset_reset(avi->dv_demux, timestamp); 1116 1117 url_fseek(s->pb, pos, SEEK_SET); 1118 avi->stream_index= -1; 1119 return 0; 1120 } 1121 1122 for(i = 0; i < s->nb_streams; i++) { 1123 AVStream *st2 = s->streams[i]; 1124 AVIStream *ast2 = st2->priv_data; 1125 1126 ast2->packet_size= 1127 ast2->remaining= 0; 1128 1129 if (st2->nb_index_entries <= 0) 1130 continue; 1131 1132// assert(st2->codec->block_align); 1133 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale); 1134 index = av_index_search_timestamp( 1135 st2, 1136 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1), 1137 flags | AVSEEK_FLAG_BACKWARD); 1138 if(index<0) 1139 index=0; 1140 1141 if(!avi->non_interleaved){ 1142 while(index>0 && st2->index_entries[index].pos > pos) 1143 index--; 1144 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos) 1145 index++; 1146 } 1147 1148// av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp); 1149 /* extract the current frame number */ 1150 ast2->frame_offset = st2->index_entries[index].timestamp; 1151 } 1152 1153 /* do the seek */ 1154 url_fseek(s->pb, pos, SEEK_SET); 1155 avi->stream_index= -1; 1156 return 0; 1157} 1158 1159static int avi_read_close(AVFormatContext *s) 1160{ 1161 int i; 1162 AVIContext *avi = s->priv_data; 1163 1164 for(i=0;i<s->nb_streams;i++) { 1165 AVStream *st = s->streams[i]; 1166 av_free(st->codec->palctrl); 1167 } 1168 1169 if (avi->dv_demux) 1170 av_free(avi->dv_demux); 1171 1172 return 0; 1173} 1174 1175static int avi_probe(AVProbeData *p) 1176{ 1177 int i; 1178 1179 /* check file header */ 1180 for(i=0; avi_headers[i][0]; i++) 1181 if(!memcmp(p->buf , avi_headers[i] , 4) && 1182 !memcmp(p->buf+8, avi_headers[i]+4, 4)) 1183 return AVPROBE_SCORE_MAX; 1184 1185 return 0; 1186} 1187 1188AVInputFormat avi_demuxer = { 1189 "avi", 1190 NULL_IF_CONFIG_SMALL("AVI format"), 1191 sizeof(AVIContext), 1192 avi_probe, 1193 avi_read_header, 1194 avi_read_packet, 1195 avi_read_close, 1196 avi_read_seek, 1197 .metadata_conv = ff_avi_metadata_conv, 1198}; 1199