1/* 2 * NSV demuxer 3 * Copyright (c) 2004 The FFmpeg Project 4 * 5 * first version by Francois Revol <revol@free.fr> 6 * 7 * This file is part of FFmpeg. 8 * 9 * FFmpeg is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU Lesser General Public 11 * License as published by the Free Software Foundation; either 12 * version 2.1 of the License, or (at your option) any later version. 13 * 14 * FFmpeg is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * Lesser General Public License for more details. 18 * 19 * You should have received a copy of the GNU Lesser General Public 20 * License along with FFmpeg; if not, write to the Free Software 21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 22 */ 23 24#include "libavutil/attributes.h" 25#include "libavutil/mathematics.h" 26#include "avformat.h" 27#include "internal.h" 28#include "libavutil/dict.h" 29#include "libavutil/intreadwrite.h" 30 31/* max bytes to crawl for trying to resync 32 * stupid streaming servers don't start at chunk boundaries... 33 */ 34#define NSV_MAX_RESYNC (500*1024) 35#define NSV_MAX_RESYNC_TRIES 300 36 37/* 38 * References: 39 * (1) http://www.multimedia.cx/nsv-format.txt 40 * seems someone came to the same conclusions as me, and updated it: 41 * (2) http://www.stud.ktu.lt/~vitslav/nsv/nsv-format.txt 42 * http://www.stud.ktu.lt/~vitslav/nsv/ 43 * official docs 44 * (3) http://ultravox.aol.com/NSVFormat.rtf 45 * Sample files: 46 * (S1) http://www.nullsoft.com/nsv/samples/ 47 * http://www.nullsoft.com/nsv/samples/faster.nsv 48 * http://streamripper.sourceforge.net/openbb/read.php?TID=492&page=4 49 */ 50 51/* 52 * notes on the header (Francois Revol): 53 * 54 * It is followed by strings, then a table, but nothing tells 55 * where the table begins according to (1). After checking faster.nsv, 56 * I believe NVSf[16-19] gives the size of the strings data 57 * (that is the offset of the data table after the header). 58 * After checking all samples from (S1) all confirms this. 59 * 60 * Then, about NSVf[12-15], faster.nsf has 179700. When veiwing it in VLC, 61 * I noticed there was about 1 NVSs chunk/s, so I ran 62 * strings faster.nsv | grep NSVs | wc -l 63 * which gave me 180. That leads me to think that NSVf[12-15] might be the 64 * file length in milliseconds. 65 * Let's try that: 66 * for f in *.nsv; do HTIME="$(od -t x4 "$f" | head -1 | sed 's/.* //')"; echo "'$f' $((0x$HTIME))s = $((0x$HTIME/1000/60)):$((0x$HTIME/1000%60))"; done 67 * except for nstrailer (which doesn't have an NSVf header), it repports correct time. 68 * 69 * nsvtrailer.nsv (S1) does not have any NSVf header, only NSVs chunks, 70 * so the header seems to not be mandatory. (for streaming). 71 * 72 * index slice duration check (excepts nsvtrailer.nsv): 73 * for f in [^n]*.nsv; do DUR="$(ffmpeg -i "$f" 2>/dev/null | grep 'NSVf duration' | cut -d ' ' -f 4)"; IC="$(ffmpeg -i "$f" 2>/dev/null | grep 'INDEX ENTRIES' | cut -d ' ' -f 2)"; echo "duration $DUR, slite time $(($DUR/$IC))"; done 74 */ 75 76/* 77 * TODO: 78 * - handle timestamps !!! 79 * - use index 80 * - mime-type in probe() 81 * - seek 82 */ 83 84#if 0 85struct NSVf_header { 86 uint32_t chunk_tag; /* 'NSVf' */ 87 uint32_t chunk_size; 88 uint32_t file_size; /* max 4GB ??? no one learns anything it seems :^) */ 89 uint32_t file_length; //unknown1; /* what about MSB of file_size ? */ 90 uint32_t info_strings_size; /* size of the info strings */ //unknown2; 91 uint32_t table_entries; 92 uint32_t table_entries_used; /* the left ones should be -1 */ 93}; 94 95struct NSVs_header { 96 uint32_t chunk_tag; /* 'NSVs' */ 97 uint32_t v4cc; /* or 'NONE' */ 98 uint32_t a4cc; /* or 'NONE' */ 99 uint16_t vwidth; /* av_assert(vwidth%16==0) */ 100 uint16_t vheight; /* av_assert(vheight%16==0) */ 101 uint8_t framerate; /* value = (framerate&0x80)?frtable[frameratex0x7f]:framerate */ 102 uint16_t unknown; 103}; 104 105struct nsv_avchunk_header { 106 uint8_t vchunk_size_lsb; 107 uint16_t vchunk_size_msb; /* value = (vchunk_size_msb << 4) | (vchunk_size_lsb >> 4) */ 108 uint16_t achunk_size; 109}; 110 111struct nsv_pcm_header { 112 uint8_t bits_per_sample; 113 uint8_t channel_count; 114 uint16_t sample_rate; 115}; 116#endif 117 118/* variation from avi.h */ 119/*typedef struct CodecTag { 120 int id; 121 unsigned int tag; 122} CodecTag;*/ 123 124/* tags */ 125 126#define T_NSVF MKTAG('N', 'S', 'V', 'f') /* file header */ 127#define T_NSVS MKTAG('N', 'S', 'V', 's') /* chunk header */ 128#define T_TOC2 MKTAG('T', 'O', 'C', '2') /* extra index marker */ 129#define T_NONE MKTAG('N', 'O', 'N', 'E') /* null a/v 4CC */ 130#define T_SUBT MKTAG('S', 'U', 'B', 'T') /* subtitle aux data */ 131#define T_ASYN MKTAG('A', 'S', 'Y', 'N') /* async a/v aux marker */ 132#define T_KEYF MKTAG('K', 'E', 'Y', 'F') /* video keyframe aux marker (addition) */ 133 134#define TB_NSVF MKBETAG('N', 'S', 'V', 'f') 135#define TB_NSVS MKBETAG('N', 'S', 'V', 's') 136 137/* hardcoded stream indexes */ 138#define NSV_ST_VIDEO 0 139#define NSV_ST_AUDIO 1 140#define NSV_ST_SUBT 2 141 142enum NSVStatus { 143 NSV_UNSYNC, 144 NSV_FOUND_NSVF, 145 NSV_HAS_READ_NSVF, 146 NSV_FOUND_NSVS, 147 NSV_HAS_READ_NSVS, 148 NSV_FOUND_BEEF, 149 NSV_GOT_VIDEO, 150 NSV_GOT_AUDIO, 151}; 152 153typedef struct NSVStream { 154 int frame_offset; /* current frame (video) or byte (audio) counter 155 (used to compute the pts) */ 156 int scale; 157 int rate; 158 int sample_size; /* audio only data */ 159 int start; 160 161 int new_frame_offset; /* temporary storage (used during seek) */ 162 int cum_len; /* temporary storage (used during seek) */ 163} NSVStream; 164 165typedef struct { 166 int base_offset; 167 int NSVf_end; 168 uint32_t *nsvs_file_offset; 169 int index_entries; 170 enum NSVStatus state; 171 AVPacket ahead[2]; /* [v, a] if .data is !NULL there is something */ 172 /* cached */ 173 int64_t duration; 174 uint32_t vtag, atag; 175 uint16_t vwidth, vheight; 176 int16_t avsync; 177 AVRational framerate; 178 uint32_t *nsvs_timestamps; 179 //DVDemuxContext* dv_demux; 180} NSVContext; 181 182static const AVCodecTag nsv_codec_video_tags[] = { 183 { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') }, 184 { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') }, 185 { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') }, 186 { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') }, 187 { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') }, 188 { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') }, 189 { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') }, 190 { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') }, 191 { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') }, 192 { AV_CODEC_ID_VP8, MKTAG('V', 'P', '8', '0') }, 193/* 194 { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') }, 195 { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') }, 196*/ 197 { AV_CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */ 198 { AV_CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') }, 199 { AV_CODEC_ID_NONE, 0 }, 200}; 201 202static const AVCodecTag nsv_codec_audio_tags[] = { 203 { AV_CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') }, 204 { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') }, 205 { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') }, 206 { AV_CODEC_ID_AAC, MKTAG('V', 'L', 'B', ' ') }, 207 { AV_CODEC_ID_SPEEX, MKTAG('S', 'P', 'X', ' ') }, 208 { AV_CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') }, 209 { AV_CODEC_ID_NONE, 0 }, 210}; 211 212//static int nsv_load_index(AVFormatContext *s); 213static int nsv_read_chunk(AVFormatContext *s, int fill_header); 214 215#define print_tag(str, tag, size) \ 216 av_dlog(NULL, "%s: tag=%c%c%c%c\n", \ 217 str, tag & 0xff, \ 218 (tag >> 8) & 0xff, \ 219 (tag >> 16) & 0xff, \ 220 (tag >> 24) & 0xff); 221 222/* try to find something we recognize, and set the state accordingly */ 223static int nsv_resync(AVFormatContext *s) 224{ 225 NSVContext *nsv = s->priv_data; 226 AVIOContext *pb = s->pb; 227 uint32_t v = 0; 228 int i; 229 230 av_dlog(s, "%s(), offset = %"PRId64", state = %d\n", __FUNCTION__, avio_tell(pb), nsv->state); 231 232 //nsv->state = NSV_UNSYNC; 233 234 for (i = 0; i < NSV_MAX_RESYNC; i++) { 235 if (url_feof(pb)) { 236 av_dlog(s, "NSV EOF\n"); 237 nsv->state = NSV_UNSYNC; 238 return -1; 239 } 240 v <<= 8; 241 v |= avio_r8(pb); 242 if (i < 8) { 243 av_dlog(s, "NSV resync: [%d] = %02x\n", i, v & 0x0FF); 244 } 245 246 if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */ 247 av_dlog(s, "NSV resynced on BEEF after %d bytes\n", i+1); 248 nsv->state = NSV_FOUND_BEEF; 249 return 0; 250 } 251 /* we read as big-endian, thus the MK*BE* */ 252 if (v == TB_NSVF) { /* NSVf */ 253 av_dlog(s, "NSV resynced on NSVf after %d bytes\n", i+1); 254 nsv->state = NSV_FOUND_NSVF; 255 return 0; 256 } 257 if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */ 258 av_dlog(s, "NSV resynced on NSVs after %d bytes\n", i+1); 259 nsv->state = NSV_FOUND_NSVS; 260 return 0; 261 } 262 263 } 264 av_dlog(s, "NSV sync lost\n"); 265 return -1; 266} 267 268static int nsv_parse_NSVf_header(AVFormatContext *s) 269{ 270 NSVContext *nsv = s->priv_data; 271 AVIOContext *pb = s->pb; 272 unsigned int av_unused file_size; 273 unsigned int size; 274 int64_t duration; 275 int strings_size; 276 int table_entries; 277 int table_entries_used; 278 279 av_dlog(s, "%s()\n", __FUNCTION__); 280 281 nsv->state = NSV_UNSYNC; /* in case we fail */ 282 283 size = avio_rl32(pb); 284 if (size < 28) 285 return -1; 286 nsv->NSVf_end = size; 287 288 //s->file_size = (uint32_t)avio_rl32(pb); 289 file_size = (uint32_t)avio_rl32(pb); 290 av_dlog(s, "NSV NSVf chunk_size %u\n", size); 291 av_dlog(s, "NSV NSVf file_size %u\n", file_size); 292 293 nsv->duration = duration = avio_rl32(pb); /* in ms */ 294 av_dlog(s, "NSV NSVf duration %"PRId64" ms\n", duration); 295 // XXX: store it in AVStreams 296 297 strings_size = avio_rl32(pb); 298 table_entries = avio_rl32(pb); 299 table_entries_used = avio_rl32(pb); 300 av_dlog(s, "NSV NSVf info-strings size: %d, table entries: %d, bis %d\n", 301 strings_size, table_entries, table_entries_used); 302 if (url_feof(pb)) 303 return -1; 304 305 av_dlog(s, "NSV got header; filepos %"PRId64"\n", avio_tell(pb)); 306 307 if (strings_size > 0) { 308 char *strings; /* last byte will be '\0' to play safe with str*() */ 309 char *p, *endp; 310 char *token, *value; 311 char quote; 312 313 p = strings = av_mallocz((size_t)strings_size + 1); 314 if (!p) 315 return AVERROR(ENOMEM); 316 endp = strings + strings_size; 317 avio_read(pb, strings, strings_size); 318 while (p < endp) { 319 while (*p == ' ') 320 p++; /* strip out spaces */ 321 if (p >= endp-2) 322 break; 323 token = p; 324 p = strchr(p, '='); 325 if (!p || p >= endp-2) 326 break; 327 *p++ = '\0'; 328 quote = *p++; 329 value = p; 330 p = strchr(p, quote); 331 if (!p || p >= endp) 332 break; 333 *p++ = '\0'; 334 av_dlog(s, "NSV NSVf INFO: %s='%s'\n", token, value); 335 av_dict_set(&s->metadata, token, value, 0); 336 } 337 av_free(strings); 338 } 339 if (url_feof(pb)) 340 return -1; 341 342 av_dlog(s, "NSV got infos; filepos %"PRId64"\n", avio_tell(pb)); 343 344 if (table_entries_used > 0) { 345 int i; 346 nsv->index_entries = table_entries_used; 347 if((unsigned)table_entries_used >= UINT_MAX / sizeof(uint32_t)) 348 return -1; 349 nsv->nsvs_file_offset = av_malloc((unsigned)table_entries_used * sizeof(uint32_t)); 350 if (!nsv->nsvs_file_offset) 351 return AVERROR(ENOMEM); 352 353 for(i=0;i<table_entries_used;i++) 354 nsv->nsvs_file_offset[i] = avio_rl32(pb) + size; 355 356 if(table_entries > table_entries_used && 357 avio_rl32(pb) == MKTAG('T','O','C','2')) { 358 nsv->nsvs_timestamps = av_malloc((unsigned)table_entries_used*sizeof(uint32_t)); 359 if (!nsv->nsvs_timestamps) 360 return AVERROR(ENOMEM); 361 for(i=0;i<table_entries_used;i++) { 362 nsv->nsvs_timestamps[i] = avio_rl32(pb); 363 } 364 } 365 } 366 367 av_dlog(s, "NSV got index; filepos %"PRId64"\n", avio_tell(pb)); 368 369 avio_seek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */ 370 371 if (url_feof(pb)) 372 return -1; 373 nsv->state = NSV_HAS_READ_NSVF; 374 return 0; 375} 376 377static int nsv_parse_NSVs_header(AVFormatContext *s) 378{ 379 NSVContext *nsv = s->priv_data; 380 AVIOContext *pb = s->pb; 381 uint32_t vtag, atag; 382 uint16_t vwidth, vheight; 383 AVRational framerate; 384 int i; 385 AVStream *st; 386 NSVStream *nst; 387 av_dlog(s, "%s()\n", __FUNCTION__); 388 389 vtag = avio_rl32(pb); 390 atag = avio_rl32(pb); 391 vwidth = avio_rl16(pb); 392 vheight = avio_rl16(pb); 393 i = avio_r8(pb); 394 395 av_dlog(s, "NSV NSVs framerate code %2x\n", i); 396 if(i&0x80) { /* odd way of giving native framerates from docs */ 397 int t=(i & 0x7F)>>2; 398 if(t<16) framerate = (AVRational){1, t+1}; 399 else framerate = (AVRational){t-15, 1}; 400 401 if(i&1){ 402 framerate.num *= 1000; 403 framerate.den *= 1001; 404 } 405 406 if((i&3)==3) framerate.num *= 24; 407 else if((i&3)==2) framerate.num *= 25; 408 else framerate.num *= 30; 409 } 410 else 411 framerate= (AVRational){i, 1}; 412 413 nsv->avsync = avio_rl16(pb); 414 nsv->framerate = framerate; 415 416 print_tag("NSV NSVs vtag", vtag, 0); 417 print_tag("NSV NSVs atag", atag, 0); 418 av_dlog(s, "NSV NSVs vsize %dx%d\n", vwidth, vheight); 419 420 /* XXX change to ap != NULL ? */ 421 if (s->nb_streams == 0) { /* streams not yet published, let's do that */ 422 nsv->vtag = vtag; 423 nsv->atag = atag; 424 nsv->vwidth = vwidth; 425 nsv->vheight = vwidth; 426 if (vtag != T_NONE) { 427 int i; 428 st = avformat_new_stream(s, NULL); 429 if (!st) 430 goto fail; 431 432 st->id = NSV_ST_VIDEO; 433 nst = av_mallocz(sizeof(NSVStream)); 434 if (!nst) 435 goto fail; 436 st->priv_data = nst; 437 st->codec->codec_type = AVMEDIA_TYPE_VIDEO; 438 st->codec->codec_tag = vtag; 439 st->codec->codec_id = ff_codec_get_id(nsv_codec_video_tags, vtag); 440 st->codec->width = vwidth; 441 st->codec->height = vheight; 442 st->codec->bits_per_coded_sample = 24; /* depth XXX */ 443 444 avpriv_set_pts_info(st, 64, framerate.den, framerate.num); 445 st->start_time = 0; 446 st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den); 447 448 for(i=0;i<nsv->index_entries;i++) { 449 if(nsv->nsvs_timestamps) { 450 av_add_index_entry(st, nsv->nsvs_file_offset[i], nsv->nsvs_timestamps[i], 451 0, 0, AVINDEX_KEYFRAME); 452 } else { 453 int64_t ts = av_rescale(i*nsv->duration/nsv->index_entries, framerate.num, 1000*framerate.den); 454 av_add_index_entry(st, nsv->nsvs_file_offset[i], ts, 0, 0, AVINDEX_KEYFRAME); 455 } 456 } 457 } 458 if (atag != T_NONE) { 459 st = avformat_new_stream(s, NULL); 460 if (!st) 461 goto fail; 462 463 st->id = NSV_ST_AUDIO; 464 nst = av_mallocz(sizeof(NSVStream)); 465 if (!nst) 466 goto fail; 467 st->priv_data = nst; 468 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 469 st->codec->codec_tag = atag; 470 st->codec->codec_id = ff_codec_get_id(nsv_codec_audio_tags, atag); 471 472 st->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */ 473 474 /* set timebase to common denominator of ms and framerate */ 475 avpriv_set_pts_info(st, 64, 1, framerate.num*1000); 476 st->start_time = 0; 477 st->duration = (int64_t)nsv->duration * framerate.num; 478 } 479 } else { 480 if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) { 481 av_dlog(s, "NSV NSVs header values differ from the first one!!!\n"); 482 //return -1; 483 } 484 } 485 486 nsv->state = NSV_HAS_READ_NSVS; 487 return 0; 488fail: 489 /* XXX */ 490 nsv->state = NSV_UNSYNC; 491 return -1; 492} 493 494static int nsv_read_header(AVFormatContext *s) 495{ 496 NSVContext *nsv = s->priv_data; 497 int i, err; 498 499 av_dlog(s, "%s()\n", __FUNCTION__); 500 av_dlog(s, "filename '%s'\n", s->filename); 501 502 nsv->state = NSV_UNSYNC; 503 nsv->ahead[0].data = nsv->ahead[1].data = NULL; 504 505 for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) { 506 if (nsv_resync(s) < 0) 507 return -1; 508 if (nsv->state == NSV_FOUND_NSVF) { 509 err = nsv_parse_NSVf_header(s); 510 if (err < 0) 511 return err; 512 } 513 /* we need the first NSVs also... */ 514 if (nsv->state == NSV_FOUND_NSVS) { 515 err = nsv_parse_NSVs_header(s); 516 if (err < 0) 517 return err; 518 break; /* we just want the first one */ 519 } 520 } 521 if (s->nb_streams < 1) /* no luck so far */ 522 return -1; 523 /* now read the first chunk, so we can attempt to decode more info */ 524 err = nsv_read_chunk(s, 1); 525 526 av_dlog(s, "parsed header\n"); 527 return err; 528} 529 530static int nsv_read_chunk(AVFormatContext *s, int fill_header) 531{ 532 NSVContext *nsv = s->priv_data; 533 AVIOContext *pb = s->pb; 534 AVStream *st[2] = {NULL, NULL}; 535 NSVStream *nst; 536 AVPacket *pkt; 537 int i, err = 0; 538 uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */ 539 uint32_t vsize; 540 uint16_t asize; 541 uint16_t auxsize; 542 543 av_dlog(s, "%s(%d)\n", __FUNCTION__, fill_header); 544 545 if (nsv->ahead[0].data || nsv->ahead[1].data) 546 return 0; //-1; /* hey! eat what you've in your plate first! */ 547 548null_chunk_retry: 549 if (url_feof(pb)) 550 return -1; 551 552 for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++) 553 err = nsv_resync(s); 554 if (err < 0) 555 return err; 556 if (nsv->state == NSV_FOUND_NSVS) 557 err = nsv_parse_NSVs_header(s); 558 if (err < 0) 559 return err; 560 if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF) 561 return -1; 562 563 auxcount = avio_r8(pb); 564 vsize = avio_rl16(pb); 565 asize = avio_rl16(pb); 566 vsize = (vsize << 4) | (auxcount >> 4); 567 auxcount &= 0x0f; 568 av_dlog(s, "NSV CHUNK %d aux, %u bytes video, %d bytes audio\n", auxcount, vsize, asize); 569 /* skip aux stuff */ 570 for (i = 0; i < auxcount; i++) { 571 uint32_t av_unused auxtag; 572 auxsize = avio_rl16(pb); 573 auxtag = avio_rl32(pb); 574 av_dlog(s, "NSV aux data: '%c%c%c%c', %d bytes\n", 575 (auxtag & 0x0ff), 576 ((auxtag >> 8) & 0x0ff), 577 ((auxtag >> 16) & 0x0ff), 578 ((auxtag >> 24) & 0x0ff), 579 auxsize); 580 avio_skip(pb, auxsize); 581 vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */ 582 } 583 584 if (url_feof(pb)) 585 return -1; 586 if (!vsize && !asize) { 587 nsv->state = NSV_UNSYNC; 588 goto null_chunk_retry; 589 } 590 591 /* map back streams to v,a */ 592 if (s->nb_streams > 0) 593 st[s->streams[0]->id] = s->streams[0]; 594 if (s->nb_streams > 1) 595 st[s->streams[1]->id] = s->streams[1]; 596 597 if (vsize && st[NSV_ST_VIDEO]) { 598 nst = st[NSV_ST_VIDEO]->priv_data; 599 pkt = &nsv->ahead[NSV_ST_VIDEO]; 600 av_get_packet(pb, pkt, vsize); 601 pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO; 602 pkt->dts = nst->frame_offset; 603 pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */ 604 for (i = 0; i < FFMIN(8, vsize); i++) 605 av_dlog(s, "NSV video: [%d] = %02x\n", i, pkt->data[i]); 606 } 607 if(st[NSV_ST_VIDEO]) 608 ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++; 609 610 if (asize && st[NSV_ST_AUDIO]) { 611 nst = st[NSV_ST_AUDIO]->priv_data; 612 pkt = &nsv->ahead[NSV_ST_AUDIO]; 613 /* read raw audio specific header on the first audio chunk... */ 614 /* on ALL audio chunks ?? seems so! */ 615 if (asize && st[NSV_ST_AUDIO]->codec->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) { 616 uint8_t bps; 617 uint8_t channels; 618 uint16_t samplerate; 619 bps = avio_r8(pb); 620 channels = avio_r8(pb); 621 samplerate = avio_rl16(pb); 622 asize-=4; 623 av_dlog(s, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate); 624 if (fill_header) { 625 st[NSV_ST_AUDIO]->need_parsing = AVSTREAM_PARSE_NONE; /* we know everything */ 626 if (bps != 16) { 627 av_dlog(s, "NSV AUDIO bit/sample != 16 (%d)!!!\n", bps); 628 } 629 if(channels) 630 bps /= channels; // ??? 631 else 632 av_log(s, AV_LOG_WARNING, "Channels is 0\n"); 633 if (bps == 8) 634 st[NSV_ST_AUDIO]->codec->codec_id = AV_CODEC_ID_PCM_U8; 635 samplerate /= 4;/* UGH ??? XXX */ 636 channels = 1; 637 st[NSV_ST_AUDIO]->codec->channels = channels; 638 st[NSV_ST_AUDIO]->codec->sample_rate = samplerate; 639 av_dlog(s, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate); 640 } 641 } 642 av_get_packet(pb, pkt, asize); 643 pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO; 644 pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */ 645 if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) { 646 /* on a nsvs frame we have new information on a/v sync */ 647 pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1); 648 pkt->dts *= (int64_t)1000 * nsv->framerate.den; 649 pkt->dts += (int64_t)nsv->avsync * nsv->framerate.num; 650 av_dlog(s, "NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts); 651 } 652 nst->frame_offset++; 653 } 654 655 nsv->state = NSV_UNSYNC; 656 return 0; 657} 658 659 660static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt) 661{ 662 NSVContext *nsv = s->priv_data; 663 int i, err = 0; 664 665 av_dlog(s, "%s()\n", __FUNCTION__); 666 667 /* in case we don't already have something to eat ... */ 668 if (nsv->ahead[0].data == NULL && nsv->ahead[1].data == NULL) 669 err = nsv_read_chunk(s, 0); 670 if (err < 0) 671 return err; 672 673 /* now pick one of the plates */ 674 for (i = 0; i < 2; i++) { 675 if (nsv->ahead[i].data) { 676 av_dlog(s, "%s: using cached packet[%d]\n", __FUNCTION__, i); 677 /* avoid the cost of new_packet + memcpy(->data) */ 678 memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket)); 679 nsv->ahead[i].data = NULL; /* we ate that one */ 680 return pkt->size; 681 } 682 } 683 684 /* this restaurant is not approvisionned :^] */ 685 return -1; 686} 687 688static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) 689{ 690 NSVContext *nsv = s->priv_data; 691 AVStream *st = s->streams[stream_index]; 692 NSVStream *nst = st->priv_data; 693 int index; 694 695 index = av_index_search_timestamp(st, timestamp, flags); 696 if(index < 0) 697 return -1; 698 699 if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0) 700 return -1; 701 702 nst->frame_offset = st->index_entries[index].timestamp; 703 nsv->state = NSV_UNSYNC; 704 return 0; 705} 706 707static int nsv_read_close(AVFormatContext *s) 708{ 709 NSVContext *nsv = s->priv_data; 710 711 av_freep(&nsv->nsvs_file_offset); 712 av_freep(&nsv->nsvs_timestamps); 713 if (nsv->ahead[0].data) 714 av_free_packet(&nsv->ahead[0]); 715 if (nsv->ahead[1].data) 716 av_free_packet(&nsv->ahead[1]); 717 return 0; 718} 719 720static int nsv_probe(AVProbeData *p) 721{ 722 int i, score = 0; 723 724 av_dlog(NULL, "nsv_probe(), buf_size %d\n", p->buf_size); 725 /* check file header */ 726 /* streamed files might not have any header */ 727 if (p->buf[0] == 'N' && p->buf[1] == 'S' && 728 p->buf[2] == 'V' && (p->buf[3] == 'f' || p->buf[3] == 's')) 729 return AVPROBE_SCORE_MAX; 730 /* XXX: do streamed files always start at chunk boundary ?? */ 731 /* or do we need to search NSVs in the byte stream ? */ 732 /* seems the servers don't bother starting clean chunks... */ 733 /* sometimes even the first header is at 9KB or something :^) */ 734 for (i = 1; i < p->buf_size - 3; i++) { 735 if (AV_RL32(p->buf + i) == AV_RL32("NSVs")) { 736 /* Get the chunk size and check if at the end we are getting 0xBEEF */ 737 int vsize = AV_RL24(p->buf+i+19) >> 4; 738 int asize = AV_RL16(p->buf+i+22); 739 int offset = i + 23 + asize + vsize + 1; 740 if (offset <= p->buf_size - 2 && AV_RL16(p->buf + offset) == 0xBEEF) 741 return 4*AVPROBE_SCORE_MAX/5; 742 score = AVPROBE_SCORE_MAX/5; 743 } 744 } 745 /* so we'll have more luck on extension... */ 746 if (av_match_ext(p->filename, "nsv")) 747 return AVPROBE_SCORE_EXTENSION; 748 /* FIXME: add mime-type check */ 749 return score; 750} 751 752AVInputFormat ff_nsv_demuxer = { 753 .name = "nsv", 754 .long_name = NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"), 755 .priv_data_size = sizeof(NSVContext), 756 .read_probe = nsv_probe, 757 .read_header = nsv_read_header, 758 .read_packet = nsv_read_packet, 759 .read_close = nsv_read_close, 760 .read_seek = nsv_read_seek, 761}; 762