1/* 2 * NSV demuxer 3 * Copyright (c) 2004 The FFmpeg Project 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#include "avformat.h" 22#include "riff.h" 23 24//#define DEBUG 25//#define DEBUG_DUMP_INDEX // XXX dumbdriving-271.nsv breaks with it commented!! 26//#define DEBUG_SEEK 27#define CHECK_SUBSEQUENT_NSVS 28//#define DISABLE_AUDIO 29 30/* max bytes to crawl for trying to resync 31 * stupid streaming servers don't start at chunk boundaries... 32 */ 33#define NSV_MAX_RESYNC (500*1024) 34#define NSV_MAX_RESYNC_TRIES 300 35 36/* 37 * First version by Francois Revol - revol@free.fr 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#ifdef DEBUG 85#define PRINT(_v) printf _v 86#else 87#define PRINT(_v) 88#endif 89 90#if 0 91struct NSVf_header { 92 uint32_t chunk_tag; /* 'NSVf' */ 93 uint32_t chunk_size; 94 uint32_t file_size; /* max 4GB ??? no one learns anything it seems :^) */ 95 uint32_t file_length; //unknown1; /* what about MSB of file_size ? */ 96 uint32_t info_strings_size; /* size of the info strings */ //unknown2; 97 uint32_t table_entries; 98 uint32_t table_entries_used; /* the left ones should be -1 */ 99}; 100 101struct NSVs_header { 102 uint32_t chunk_tag; /* 'NSVs' */ 103 uint32_t v4cc; /* or 'NONE' */ 104 uint32_t a4cc; /* or 'NONE' */ 105 uint16_t vwidth; /* assert(vwidth%16==0) */ 106 uint16_t vheight; /* assert(vheight%16==0) */ 107 uint8_t framerate; /* value = (framerate&0x80)?frtable[frameratex0x7f]:framerate */ 108 uint16_t unknown; 109}; 110 111struct nsv_avchunk_header { 112 uint8_t vchunk_size_lsb; 113 uint16_t vchunk_size_msb; /* value = (vchunk_size_msb << 4) | (vchunk_size_lsb >> 4) */ 114 uint16_t achunk_size; 115}; 116 117struct nsv_pcm_header { 118 uint8_t bits_per_sample; 119 uint8_t channel_count; 120 uint16_t sample_rate; 121}; 122#endif 123 124/* variation from avi.h */ 125/*typedef struct CodecTag { 126 int id; 127 unsigned int tag; 128} CodecTag;*/ 129 130/* tags */ 131 132#define T_NSVF MKTAG('N', 'S', 'V', 'f') /* file header */ 133#define T_NSVS MKTAG('N', 'S', 'V', 's') /* chunk header */ 134#define T_TOC2 MKTAG('T', 'O', 'C', '2') /* extra index marker */ 135#define T_NONE MKTAG('N', 'O', 'N', 'E') /* null a/v 4CC */ 136#define T_SUBT MKTAG('S', 'U', 'B', 'T') /* subtitle aux data */ 137#define T_ASYN MKTAG('A', 'S', 'Y', 'N') /* async a/v aux marker */ 138#define T_KEYF MKTAG('K', 'E', 'Y', 'F') /* video keyframe aux marker (addition) */ 139 140#define TB_NSVF MKBETAG('N', 'S', 'V', 'f') 141#define TB_NSVS MKBETAG('N', 'S', 'V', 's') 142 143/* hardcoded stream indexes */ 144#define NSV_ST_VIDEO 0 145#define NSV_ST_AUDIO 1 146#define NSV_ST_SUBT 2 147 148enum NSVStatus { 149 NSV_UNSYNC, 150 NSV_FOUND_NSVF, 151 NSV_HAS_READ_NSVF, 152 NSV_FOUND_NSVS, 153 NSV_HAS_READ_NSVS, 154 NSV_FOUND_BEEF, 155 NSV_GOT_VIDEO, 156 NSV_GOT_AUDIO, 157}; 158 159typedef struct NSVStream { 160 int frame_offset; /* current frame (video) or byte (audio) counter 161 (used to compute the pts) */ 162 int scale; 163 int rate; 164 int sample_size; /* audio only data */ 165 int start; 166 167 int new_frame_offset; /* temporary storage (used during seek) */ 168 int cum_len; /* temporary storage (used during seek) */ 169} NSVStream; 170 171typedef struct { 172 int base_offset; 173 int NSVf_end; 174 uint32_t *nsvs_file_offset; 175 int index_entries; 176 enum NSVStatus state; 177 AVPacket ahead[2]; /* [v, a] if .data is !NULL there is something */ 178 /* cached */ 179 int64_t duration; 180 uint32_t vtag, atag; 181 uint16_t vwidth, vheight; 182 int16_t avsync; 183 AVRational framerate; 184 uint32_t *nsvs_timestamps; 185 //DVDemuxContext* dv_demux; 186} NSVContext; 187 188static const AVCodecTag nsv_codec_video_tags[] = { 189 { CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') }, 190 { CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') }, 191 { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') }, 192 { CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') }, 193 { CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') }, 194 { CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') }, 195 { CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') }, 196 { CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') }, 197 { CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') }, 198/* 199 { CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') }, 200 { CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') }, 201*/ 202 { CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */ 203 { CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') }, 204 { CODEC_ID_NONE, 0 }, 205}; 206 207static const AVCodecTag nsv_codec_audio_tags[] = { 208 { CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') }, 209 { CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') }, 210 { CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') }, 211 { CODEC_ID_SPEEX, MKTAG('S', 'P', 'X', ' ') }, 212 { CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') }, 213 { CODEC_ID_NONE, 0 }, 214}; 215 216//static int nsv_load_index(AVFormatContext *s); 217static int nsv_read_chunk(AVFormatContext *s, int fill_header); 218 219#ifdef DEBUG 220static void print_tag(const char *str, unsigned int tag, int size) 221{ 222 printf("%s: tag=%c%c%c%c\n", 223 str, tag & 0xff, 224 (tag >> 8) & 0xff, 225 (tag >> 16) & 0xff, 226 (tag >> 24) & 0xff); 227} 228#endif 229 230/* try to find something we recognize, and set the state accordingly */ 231static int nsv_resync(AVFormatContext *s) 232{ 233 NSVContext *nsv = s->priv_data; 234 ByteIOContext *pb = s->pb; 235 uint32_t v = 0; 236 int i; 237 238 PRINT(("%s(), offset = %"PRId64", state = %d\n", __FUNCTION__, url_ftell(pb), nsv->state)); 239 240 //nsv->state = NSV_UNSYNC; 241 242 for (i = 0; i < NSV_MAX_RESYNC; i++) { 243 if (url_feof(pb)) { 244 PRINT(("NSV EOF\n")); 245 nsv->state = NSV_UNSYNC; 246 return -1; 247 } 248 v <<= 8; 249 v |= get_byte(pb); 250/* 251 if (i < 8) { 252 PRINT(("NSV resync: [%d] = %02x\n", i, v & 0x0FF)); 253 } 254*/ 255 256 if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */ 257 PRINT(("NSV resynced on BEEF after %d bytes\n", i+1)); 258 nsv->state = NSV_FOUND_BEEF; 259 return 0; 260 } 261 /* we read as big endian, thus the MK*BE* */ 262 if (v == TB_NSVF) { /* NSVf */ 263 PRINT(("NSV resynced on NSVf after %d bytes\n", i+1)); 264 nsv->state = NSV_FOUND_NSVF; 265 return 0; 266 } 267 if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */ 268 PRINT(("NSV resynced on NSVs after %d bytes\n", i+1)); 269 nsv->state = NSV_FOUND_NSVS; 270 return 0; 271 } 272 273 } 274 PRINT(("NSV sync lost\n")); 275 return -1; 276} 277 278static int nsv_parse_NSVf_header(AVFormatContext *s, AVFormatParameters *ap) 279{ 280 NSVContext *nsv = s->priv_data; 281 ByteIOContext *pb = s->pb; 282 unsigned int file_size, size; 283 int64_t duration; 284 int strings_size; 285 int table_entries; 286 int table_entries_used; 287 288 PRINT(("%s()\n", __FUNCTION__)); 289 290 nsv->state = NSV_UNSYNC; /* in case we fail */ 291 292 size = get_le32(pb); 293 if (size < 28) 294 return -1; 295 nsv->NSVf_end = size; 296 297 //s->file_size = (uint32_t)get_le32(pb); 298 file_size = (uint32_t)get_le32(pb); 299 PRINT(("NSV NSVf chunk_size %u\n", size)); 300 PRINT(("NSV NSVf file_size %u\n", file_size)); 301 302 nsv->duration = duration = get_le32(pb); /* in ms */ 303 PRINT(("NSV NSVf duration %"PRId64" ms\n", duration)); 304 // XXX: store it in AVStreams 305 306 strings_size = get_le32(pb); 307 table_entries = get_le32(pb); 308 table_entries_used = get_le32(pb); 309 PRINT(("NSV NSVf info-strings size: %d, table entries: %d, bis %d\n", 310 strings_size, table_entries, table_entries_used)); 311 if (url_feof(pb)) 312 return -1; 313 314 PRINT(("NSV got header; filepos %"PRId64"\n", url_ftell(pb))); 315 316 if (strings_size > 0) { 317 char *strings; /* last byte will be '\0' to play safe with str*() */ 318 char *p, *endp; 319 char *token, *value; 320 char quote; 321 322 p = strings = av_mallocz(strings_size + 1); 323 endp = strings + strings_size; 324 get_buffer(pb, strings, strings_size); 325 while (p < endp) { 326 while (*p == ' ') 327 p++; /* strip out spaces */ 328 if (p >= endp-2) 329 break; 330 token = p; 331 p = strchr(p, '='); 332 if (!p || p >= endp-2) 333 break; 334 *p++ = '\0'; 335 quote = *p++; 336 value = p; 337 p = strchr(p, quote); 338 if (!p || p >= endp) 339 break; 340 *p++ = '\0'; 341 PRINT(("NSV NSVf INFO: %s='%s'\n", token, value)); 342 av_metadata_set2(&s->metadata, token, value, 0); 343 } 344 av_free(strings); 345 } 346 if (url_feof(pb)) 347 return -1; 348 349 PRINT(("NSV got infos; filepos %"PRId64"\n", url_ftell(pb))); 350 351 if (table_entries_used > 0) { 352 int i; 353 nsv->index_entries = table_entries_used; 354 if((unsigned)table_entries_used >= UINT_MAX / sizeof(uint32_t)) 355 return -1; 356 nsv->nsvs_file_offset = av_malloc((unsigned)table_entries_used * sizeof(uint32_t)); 357 358 for(i=0;i<table_entries_used;i++) 359 nsv->nsvs_file_offset[i] = get_le32(pb) + size; 360 361 if(table_entries > table_entries_used && 362 get_le32(pb) == MKTAG('T','O','C','2')) { 363 nsv->nsvs_timestamps = av_malloc((unsigned)table_entries_used*sizeof(uint32_t)); 364 for(i=0;i<table_entries_used;i++) { 365 nsv->nsvs_timestamps[i] = get_le32(pb); 366 } 367 } 368 } 369 370 PRINT(("NSV got index; filepos %"PRId64"\n", url_ftell(pb))); 371 372#ifdef DEBUG_DUMP_INDEX 373#define V(v) ((v<0x20 || v > 127)?'.':v) 374 /* dump index */ 375 PRINT(("NSV %d INDEX ENTRIES:\n", table_entries)); 376 PRINT(("NSV [dataoffset][fileoffset]\n", table_entries)); 377 for (i = 0; i < table_entries; i++) { 378 unsigned char b[8]; 379 url_fseek(pb, size + nsv->nsvs_file_offset[i], SEEK_SET); 380 get_buffer(pb, b, 8); 381 PRINT(("NSV [0x%08lx][0x%08lx]: %02x %02x %02x %02x %02x %02x %02x %02x" 382 "%c%c%c%c%c%c%c%c\n", 383 nsv->nsvs_file_offset[i], size + nsv->nsvs_file_offset[i], 384 b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7], 385 V(b[0]), V(b[1]), V(b[2]), V(b[3]), V(b[4]), V(b[5]), V(b[6]), V(b[7]) )); 386 } 387 //url_fseek(pb, size, SEEK_SET); /* go back to end of header */ 388#undef V 389#endif 390 391 url_fseek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */ 392 393 if (url_feof(pb)) 394 return -1; 395 nsv->state = NSV_HAS_READ_NSVF; 396 return 0; 397} 398 399static int nsv_parse_NSVs_header(AVFormatContext *s, AVFormatParameters *ap) 400{ 401 NSVContext *nsv = s->priv_data; 402 ByteIOContext *pb = s->pb; 403 uint32_t vtag, atag; 404 uint16_t vwidth, vheight; 405 AVRational framerate; 406 int i; 407 AVStream *st; 408 NSVStream *nst; 409 PRINT(("%s()\n", __FUNCTION__)); 410 411 vtag = get_le32(pb); 412 atag = get_le32(pb); 413 vwidth = get_le16(pb); 414 vheight = get_le16(pb); 415 i = get_byte(pb); 416 417 PRINT(("NSV NSVs framerate code %2x\n", i)); 418 if(i&0x80) { /* odd way of giving native framerates from docs */ 419 int t=(i & 0x7F)>>2; 420 if(t<16) framerate = (AVRational){1, t+1}; 421 else framerate = (AVRational){t-15, 1}; 422 423 if(i&1){ 424 framerate.num *= 1000; 425 framerate.den *= 1001; 426 } 427 428 if((i&3)==3) framerate.num *= 24; 429 else if((i&3)==2) framerate.num *= 25; 430 else framerate.num *= 30; 431 } 432 else 433 framerate= (AVRational){i, 1}; 434 435 nsv->avsync = get_le16(pb); 436 nsv->framerate = framerate; 437#ifdef DEBUG 438 print_tag("NSV NSVs vtag", vtag, 0); 439 print_tag("NSV NSVs atag", atag, 0); 440 PRINT(("NSV NSVs vsize %dx%d\n", vwidth, vheight)); 441#endif 442 443 /* XXX change to ap != NULL ? */ 444 if (s->nb_streams == 0) { /* streams not yet published, let's do that */ 445 nsv->vtag = vtag; 446 nsv->atag = atag; 447 nsv->vwidth = vwidth; 448 nsv->vheight = vwidth; 449 if (vtag != T_NONE) { 450 int i; 451 st = av_new_stream(s, NSV_ST_VIDEO); 452 if (!st) 453 goto fail; 454 455 nst = av_mallocz(sizeof(NSVStream)); 456 if (!nst) 457 goto fail; 458 st->priv_data = nst; 459 st->codec->codec_type = AVMEDIA_TYPE_VIDEO; 460 st->codec->codec_tag = vtag; 461 st->codec->codec_id = ff_codec_get_id(nsv_codec_video_tags, vtag); 462 st->codec->width = vwidth; 463 st->codec->height = vheight; 464 st->codec->bits_per_coded_sample = 24; /* depth XXX */ 465 466 av_set_pts_info(st, 64, framerate.den, framerate.num); 467 st->start_time = 0; 468 st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den); 469 470 for(i=0;i<nsv->index_entries;i++) { 471 if(nsv->nsvs_timestamps) { 472 av_add_index_entry(st, nsv->nsvs_file_offset[i], nsv->nsvs_timestamps[i], 473 0, 0, AVINDEX_KEYFRAME); 474 } else { 475 int64_t ts = av_rescale(i*nsv->duration/nsv->index_entries, framerate.num, 1000*framerate.den); 476 av_add_index_entry(st, nsv->nsvs_file_offset[i], ts, 0, 0, AVINDEX_KEYFRAME); 477 } 478 } 479 } 480 if (atag != T_NONE) { 481#ifndef DISABLE_AUDIO 482 st = av_new_stream(s, NSV_ST_AUDIO); 483 if (!st) 484 goto fail; 485 486 nst = av_mallocz(sizeof(NSVStream)); 487 if (!nst) 488 goto fail; 489 st->priv_data = nst; 490 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 491 st->codec->codec_tag = atag; 492 st->codec->codec_id = ff_codec_get_id(nsv_codec_audio_tags, atag); 493 494 st->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */ 495 496 /* set timebase to common denominator of ms and framerate */ 497 av_set_pts_info(st, 64, 1, framerate.num*1000); 498 st->start_time = 0; 499 st->duration = (int64_t)nsv->duration * framerate.num; 500#endif 501 } 502#ifdef CHECK_SUBSEQUENT_NSVS 503 } else { 504 if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) { 505 PRINT(("NSV NSVs header values differ from the first one!!!\n")); 506 //return -1; 507 } 508#endif /* CHECK_SUBSEQUENT_NSVS */ 509 } 510 511 nsv->state = NSV_HAS_READ_NSVS; 512 return 0; 513fail: 514 /* XXX */ 515 nsv->state = NSV_UNSYNC; 516 return -1; 517} 518 519static int nsv_read_header(AVFormatContext *s, AVFormatParameters *ap) 520{ 521 NSVContext *nsv = s->priv_data; 522 int i, err; 523 524 PRINT(("%s()\n", __FUNCTION__)); 525 PRINT(("filename '%s'\n", s->filename)); 526 527 nsv->state = NSV_UNSYNC; 528 nsv->ahead[0].data = nsv->ahead[1].data = NULL; 529 530 for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) { 531 if (nsv_resync(s) < 0) 532 return -1; 533 if (nsv->state == NSV_FOUND_NSVF) 534 err = nsv_parse_NSVf_header(s, ap); 535 /* we need the first NSVs also... */ 536 if (nsv->state == NSV_FOUND_NSVS) { 537 err = nsv_parse_NSVs_header(s, ap); 538 break; /* we just want the first one */ 539 } 540 } 541 if (s->nb_streams < 1) /* no luck so far */ 542 return -1; 543 /* now read the first chunk, so we can attempt to decode more info */ 544 err = nsv_read_chunk(s, 1); 545 546 PRINT(("parsed header\n")); 547 return 0; 548} 549 550static int nsv_read_chunk(AVFormatContext *s, int fill_header) 551{ 552 NSVContext *nsv = s->priv_data; 553 ByteIOContext *pb = s->pb; 554 AVStream *st[2] = {NULL, NULL}; 555 NSVStream *nst; 556 AVPacket *pkt; 557 int i, err = 0; 558 uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */ 559 uint32_t vsize; 560 uint16_t asize; 561 uint16_t auxsize; 562 uint32_t auxtag; 563 564 PRINT(("%s(%d)\n", __FUNCTION__, fill_header)); 565 566 if (nsv->ahead[0].data || nsv->ahead[1].data) 567 return 0; //-1; /* hey! eat what you've in your plate first! */ 568 569null_chunk_retry: 570 if (url_feof(pb)) 571 return -1; 572 573 for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++) 574 err = nsv_resync(s); 575 if (err < 0) 576 return err; 577 if (nsv->state == NSV_FOUND_NSVS) 578 err = nsv_parse_NSVs_header(s, NULL); 579 if (err < 0) 580 return err; 581 if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF) 582 return -1; 583 584 auxcount = get_byte(pb); 585 vsize = get_le16(pb); 586 asize = get_le16(pb); 587 vsize = (vsize << 4) | (auxcount >> 4); 588 auxcount &= 0x0f; 589 PRINT(("NSV CHUNK %d aux, %u bytes video, %d bytes audio\n", auxcount, vsize, asize)); 590 /* skip aux stuff */ 591 for (i = 0; i < auxcount; i++) { 592 auxsize = get_le16(pb); 593 auxtag = get_le32(pb); 594 PRINT(("NSV aux data: '%c%c%c%c', %d bytes\n", 595 (auxtag & 0x0ff), 596 ((auxtag >> 8) & 0x0ff), 597 ((auxtag >> 16) & 0x0ff), 598 ((auxtag >> 24) & 0x0ff), 599 auxsize)); 600 url_fskip(pb, auxsize); 601 vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */ 602 } 603 604 if (url_feof(pb)) 605 return -1; 606 if (!vsize && !asize) { 607 nsv->state = NSV_UNSYNC; 608 goto null_chunk_retry; 609 } 610 611 /* map back streams to v,a */ 612 if (s->streams[0]) 613 st[s->streams[0]->id] = s->streams[0]; 614 if (s->streams[1]) 615 st[s->streams[1]->id] = s->streams[1]; 616 617 if (vsize/* && st[NSV_ST_VIDEO]*/) { 618 nst = st[NSV_ST_VIDEO]->priv_data; 619 pkt = &nsv->ahead[NSV_ST_VIDEO]; 620 av_get_packet(pb, pkt, vsize); 621 pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO; 622 pkt->dts = nst->frame_offset; 623 pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */ 624/* 625 for (i = 0; i < MIN(8, vsize); i++) 626 PRINT(("NSV video: [%d] = %02x\n", i, pkt->data[i])); 627*/ 628 } 629 if(st[NSV_ST_VIDEO]) 630 ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++; 631 632 if (asize/*st[NSV_ST_AUDIO]*/) { 633 nst = st[NSV_ST_AUDIO]->priv_data; 634 pkt = &nsv->ahead[NSV_ST_AUDIO]; 635 /* read raw audio specific header on the first audio chunk... */ 636 /* on ALL audio chunks ?? seems so! */ 637 if (asize && st[NSV_ST_AUDIO]->codec->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) { 638 uint8_t bps; 639 uint8_t channels; 640 uint16_t samplerate; 641 bps = get_byte(pb); 642 channels = get_byte(pb); 643 samplerate = get_le16(pb); 644 asize-=4; 645 PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate)); 646 if (fill_header) { 647 st[NSV_ST_AUDIO]->need_parsing = AVSTREAM_PARSE_NONE; /* we know everything */ 648 if (bps != 16) { 649 PRINT(("NSV AUDIO bit/sample != 16 (%d)!!!\n", bps)); 650 } 651 bps /= channels; // ??? 652 if (bps == 8) 653 st[NSV_ST_AUDIO]->codec->codec_id = CODEC_ID_PCM_U8; 654 samplerate /= 4;/* UGH ??? XXX */ 655 channels = 1; 656 st[NSV_ST_AUDIO]->codec->channels = channels; 657 st[NSV_ST_AUDIO]->codec->sample_rate = samplerate; 658 PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate)); 659 } 660 } 661 av_get_packet(pb, pkt, asize); 662 pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO; 663 pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */ 664 if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) { 665 /* on a nsvs frame we have new information on a/v sync */ 666 pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1); 667 pkt->dts *= (int64_t)1000 * nsv->framerate.den; 668 pkt->dts += (int64_t)nsv->avsync * nsv->framerate.num; 669 PRINT(("NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts)); 670 } 671 nst->frame_offset++; 672 } 673 674 nsv->state = NSV_UNSYNC; 675 return 0; 676} 677 678 679static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt) 680{ 681 NSVContext *nsv = s->priv_data; 682 int i, err = 0; 683 684 PRINT(("%s()\n", __FUNCTION__)); 685 686 /* in case we don't already have something to eat ... */ 687 if (nsv->ahead[0].data == NULL && nsv->ahead[1].data == NULL) 688 err = nsv_read_chunk(s, 0); 689 if (err < 0) 690 return err; 691 692 /* now pick one of the plates */ 693 for (i = 0; i < 2; i++) { 694 if (nsv->ahead[i].data) { 695 PRINT(("%s: using cached packet[%d]\n", __FUNCTION__, i)); 696 /* avoid the cost of new_packet + memcpy(->data) */ 697 memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket)); 698 nsv->ahead[i].data = NULL; /* we ate that one */ 699 return pkt->size; 700 } 701 } 702 703 /* this restaurant is not approvisionned :^] */ 704 return -1; 705} 706 707static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) 708{ 709 NSVContext *nsv = s->priv_data; 710 AVStream *st = s->streams[stream_index]; 711 NSVStream *nst = st->priv_data; 712 int index; 713 714 index = av_index_search_timestamp(st, timestamp, flags); 715 if(index < 0) 716 return -1; 717 718 url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET); 719 nst->frame_offset = st->index_entries[index].timestamp; 720 nsv->state = NSV_UNSYNC; 721 return 0; 722} 723 724static int nsv_read_close(AVFormatContext *s) 725{ 726/* int i; */ 727 NSVContext *nsv = s->priv_data; 728 729 av_freep(&nsv->nsvs_file_offset); 730 av_freep(&nsv->nsvs_timestamps); 731 if (nsv->ahead[0].data) 732 av_free_packet(&nsv->ahead[0]); 733 if (nsv->ahead[1].data) 734 av_free_packet(&nsv->ahead[1]); 735 736#if 0 737 738 for(i=0;i<s->nb_streams;i++) { 739 AVStream *st = s->streams[i]; 740 NSVStream *ast = st->priv_data; 741 if(ast){ 742 av_free(ast->index_entries); 743 av_free(ast); 744 } 745 av_free(st->codec->palctrl); 746 } 747 748#endif 749 return 0; 750} 751 752static int nsv_probe(AVProbeData *p) 753{ 754 int i; 755// PRINT(("nsv_probe(), buf_size %d\n", p->buf_size)); 756 /* check file header */ 757 /* streamed files might not have any header */ 758 if (p->buf[0] == 'N' && p->buf[1] == 'S' && 759 p->buf[2] == 'V' && (p->buf[3] == 'f' || p->buf[3] == 's')) 760 return AVPROBE_SCORE_MAX; 761 /* XXX: do streamed files always start at chunk boundary ?? */ 762 /* or do we need to search NSVs in the byte stream ? */ 763 /* seems the servers don't bother starting clean chunks... */ 764 /* sometimes even the first header is at 9KB or something :^) */ 765 for (i = 1; i < p->buf_size - 3; i++) { 766 if (p->buf[i+0] == 'N' && p->buf[i+1] == 'S' && 767 p->buf[i+2] == 'V' && p->buf[i+3] == 's') 768 return AVPROBE_SCORE_MAX-20; 769 } 770 /* so we'll have more luck on extension... */ 771 if (av_match_ext(p->filename, "nsv")) 772 return AVPROBE_SCORE_MAX/2; 773 /* FIXME: add mime-type check */ 774 return 0; 775} 776 777AVInputFormat nsv_demuxer = { 778 "nsv", 779 NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"), 780 sizeof(NSVContext), 781 nsv_probe, 782 nsv_read_header, 783 nsv_read_packet, 784 nsv_read_close, 785 nsv_read_seek, 786}; 787