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 *nsvf_index_data; 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 //DVDemuxContext* dv_demux; 185} NSVContext; 186 187static const AVCodecTag nsv_codec_video_tags[] = { 188 { CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') }, 189 { CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') }, 190 { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') }, 191 { CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') }, 192 { CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') }, 193 { CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') }, 194 { CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') }, 195 { CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') }, 196 { CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') }, 197/* 198 { CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') }, 199 { CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') }, 200*/ 201 { CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */ 202 { CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') }, 203 { 0, 0 }, 204}; 205 206static const AVCodecTag nsv_codec_audio_tags[] = { 207 { CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') }, 208 { CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') }, 209 { CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') }, /* _CUTTED__MUXED_2 Heads - Out Of The City.nsv */ 210 { CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') }, 211 { 0, 0 }, 212}; 213 214//static int nsv_load_index(AVFormatContext *s); 215static int nsv_read_chunk(AVFormatContext *s, int fill_header); 216 217#ifdef DEBUG 218static void print_tag(const char *str, unsigned int tag, int size) 219{ 220 printf("%s: tag=%c%c%c%c\n", 221 str, tag & 0xff, 222 (tag >> 8) & 0xff, 223 (tag >> 16) & 0xff, 224 (tag >> 24) & 0xff); 225} 226#endif 227 228/* try to find something we recognize, and set the state accordingly */ 229static int nsv_resync(AVFormatContext *s) 230{ 231 NSVContext *nsv = s->priv_data; 232 ByteIOContext *pb = s->pb; 233 uint32_t v = 0; 234 int i; 235 236 PRINT(("%s(), offset = %"PRId64", state = %d\n", __FUNCTION__, url_ftell(pb), nsv->state)); 237 238 //nsv->state = NSV_UNSYNC; 239 240 for (i = 0; i < NSV_MAX_RESYNC; i++) { 241 if (url_feof(pb)) { 242 PRINT(("NSV EOF\n")); 243 nsv->state = NSV_UNSYNC; 244 return -1; 245 } 246 v <<= 8; 247 v |= get_byte(pb); 248/* 249 if (i < 8) { 250 PRINT(("NSV resync: [%d] = %02x\n", i, v & 0x0FF)); 251 } 252*/ 253 254 if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */ 255 PRINT(("NSV resynced on BEEF after %d bytes\n", i+1)); 256 nsv->state = NSV_FOUND_BEEF; 257 return 0; 258 } 259 /* we read as big endian, thus the MK*BE* */ 260 if (v == TB_NSVF) { /* NSVf */ 261 PRINT(("NSV resynced on NSVf after %d bytes\n", i+1)); 262 nsv->state = NSV_FOUND_NSVF; 263 return 0; 264 } 265 if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */ 266 PRINT(("NSV resynced on NSVs after %d bytes\n", i+1)); 267 nsv->state = NSV_FOUND_NSVS; 268 return 0; 269 } 270 271 } 272 PRINT(("NSV sync lost\n")); 273 return -1; 274} 275 276static int nsv_parse_NSVf_header(AVFormatContext *s, AVFormatParameters *ap) 277{ 278 NSVContext *nsv = s->priv_data; 279 ByteIOContext *pb = s->pb; 280 unsigned int file_size, size; 281 int64_t duration; 282 int strings_size; 283 int table_entries; 284 int table_entries_used; 285 286 PRINT(("%s()\n", __FUNCTION__)); 287 288 nsv->state = NSV_UNSYNC; /* in case we fail */ 289 290 size = get_le32(pb); 291 if (size < 28) 292 return -1; 293 nsv->NSVf_end = size; 294 295 //s->file_size = (uint32_t)get_le32(pb); 296 file_size = (uint32_t)get_le32(pb); 297 PRINT(("NSV NSVf chunk_size %u\n", size)); 298 PRINT(("NSV NSVf file_size %u\n", file_size)); 299 300 nsv->duration = duration = get_le32(pb); /* in ms */ 301 PRINT(("NSV NSVf duration %"PRId64" ms\n", duration)); 302 // XXX: store it in AVStreams 303 304 strings_size = get_le32(pb); 305 table_entries = get_le32(pb); 306 table_entries_used = get_le32(pb); 307 PRINT(("NSV NSVf info-strings size: %d, table entries: %d, bis %d\n", 308 strings_size, table_entries, table_entries_used)); 309 if (url_feof(pb)) 310 return -1; 311 312 PRINT(("NSV got header; filepos %"PRId64"\n", url_ftell(pb))); 313 314 if (strings_size > 0) { 315 char *strings; /* last byte will be '\0' to play safe with str*() */ 316 char *p, *endp; 317 char *token, *value; 318 char quote; 319 320 p = strings = av_mallocz(strings_size + 1); 321 endp = strings + strings_size; 322 get_buffer(pb, strings, strings_size); 323 while (p < endp) { 324 while (*p == ' ') 325 p++; /* strip out spaces */ 326 if (p >= endp-2) 327 break; 328 token = p; 329 p = strchr(p, '='); 330 if (!p || p >= endp-2) 331 break; 332 *p++ = '\0'; 333 quote = *p++; 334 value = p; 335 p = strchr(p, quote); 336 if (!p || p >= endp) 337 break; 338 *p++ = '\0'; 339 PRINT(("NSV NSVf INFO: %s='%s'\n", token, value)); 340 av_metadata_set(&s->metadata, token, value); 341 } 342 av_free(strings); 343 } 344 if (url_feof(pb)) 345 return -1; 346 347 PRINT(("NSV got infos; filepos %"PRId64"\n", url_ftell(pb))); 348 349 if (table_entries_used > 0) { 350 nsv->index_entries = table_entries_used; 351 if((unsigned)table_entries >= UINT_MAX / sizeof(uint32_t)) 352 return -1; 353 nsv->nsvf_index_data = av_malloc(table_entries * sizeof(uint32_t)); 354#warning "FIXME: Byteswap buffer as needed" 355 get_buffer(pb, (unsigned char *)nsv->nsvf_index_data, table_entries * sizeof(uint32_t)); 356 } 357 358 PRINT(("NSV got index; filepos %"PRId64"\n", url_ftell(pb))); 359 360#ifdef DEBUG_DUMP_INDEX 361#define V(v) ((v<0x20 || v > 127)?'.':v) 362 /* dump index */ 363 PRINT(("NSV %d INDEX ENTRIES:\n", table_entries)); 364 PRINT(("NSV [dataoffset][fileoffset]\n", table_entries)); 365 for (i = 0; i < table_entries; i++) { 366 unsigned char b[8]; 367 url_fseek(pb, size + nsv->nsvf_index_data[i], SEEK_SET); 368 get_buffer(pb, b, 8); 369 PRINT(("NSV [0x%08lx][0x%08lx]: %02x %02x %02x %02x %02x %02x %02x %02x" 370 "%c%c%c%c%c%c%c%c\n", 371 nsv->nsvf_index_data[i], size + nsv->nsvf_index_data[i], 372 b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7], 373 V(b[0]), V(b[1]), V(b[2]), V(b[3]), V(b[4]), V(b[5]), V(b[6]), V(b[7]) )); 374 } 375 //url_fseek(pb, size, SEEK_SET); /* go back to end of header */ 376#undef V 377#endif 378 379 url_fseek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */ 380 381 if (url_feof(pb)) 382 return -1; 383 nsv->state = NSV_HAS_READ_NSVF; 384 return 0; 385} 386 387static int nsv_parse_NSVs_header(AVFormatContext *s, AVFormatParameters *ap) 388{ 389 NSVContext *nsv = s->priv_data; 390 ByteIOContext *pb = s->pb; 391 uint32_t vtag, atag; 392 uint16_t vwidth, vheight; 393 AVRational framerate; 394 int i; 395 AVStream *st; 396 NSVStream *nst; 397 PRINT(("%s()\n", __FUNCTION__)); 398 399 vtag = get_le32(pb); 400 atag = get_le32(pb); 401 vwidth = get_le16(pb); 402 vheight = get_le16(pb); 403 i = get_byte(pb); 404 405 PRINT(("NSV NSVs framerate code %2x\n", i)); 406 if(i&0x80) { /* odd way of giving native framerates from docs */ 407 int t=(i & 0x7F)>>2; 408 if(t<16) framerate = (AVRational){1, t+1}; 409 else framerate = (AVRational){t-15, 1}; 410 411 if(i&1){ 412 framerate.num *= 1000; 413 framerate.den *= 1001; 414 } 415 416 if((i&3)==3) framerate.num *= 24; 417 else if((i&3)==2) framerate.num *= 25; 418 else framerate.num *= 30; 419 } 420 else 421 framerate= (AVRational){i, 1}; 422 423 nsv->avsync = get_le16(pb); 424 nsv->framerate = framerate; 425#ifdef DEBUG 426 print_tag("NSV NSVs vtag", vtag, 0); 427 print_tag("NSV NSVs atag", atag, 0); 428 PRINT(("NSV NSVs vsize %dx%d\n", vwidth, vheight)); 429#endif 430 431 /* XXX change to ap != NULL ? */ 432 if (s->nb_streams == 0) { /* streams not yet published, let's do that */ 433 nsv->vtag = vtag; 434 nsv->atag = atag; 435 nsv->vwidth = vwidth; 436 nsv->vheight = vwidth; 437 if (vtag != T_NONE) { 438 st = av_new_stream(s, NSV_ST_VIDEO); 439 if (!st) 440 goto fail; 441 442 nst = av_mallocz(sizeof(NSVStream)); 443 if (!nst) 444 goto fail; 445 st->priv_data = nst; 446 st->codec->codec_type = CODEC_TYPE_VIDEO; 447 st->codec->codec_tag = vtag; 448 st->codec->codec_id = codec_get_id(nsv_codec_video_tags, vtag); 449 st->codec->width = vwidth; 450 st->codec->height = vheight; 451 st->codec->bits_per_coded_sample = 24; /* depth XXX */ 452 453 av_set_pts_info(st, 64, framerate.den, framerate.num); 454 st->start_time = 0; 455 st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den); 456 } 457 if (atag != T_NONE) { 458#ifndef DISABLE_AUDIO 459 st = av_new_stream(s, NSV_ST_AUDIO); 460 if (!st) 461 goto fail; 462 463 nst = av_mallocz(sizeof(NSVStream)); 464 if (!nst) 465 goto fail; 466 st->priv_data = nst; 467 st->codec->codec_type = CODEC_TYPE_AUDIO; 468 st->codec->codec_tag = atag; 469 st->codec->codec_id = codec_get_id(nsv_codec_audio_tags, atag); 470 471 st->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */ 472 473 /* set timebase to common denominator of ms and framerate */ 474 av_set_pts_info(st, 64, 1, framerate.num*1000); 475 st->start_time = 0; 476 st->duration = (int64_t)nsv->duration * framerate.num; 477#endif 478 } 479#ifdef CHECK_SUBSEQUENT_NSVS 480 } else { 481 if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) { 482 PRINT(("NSV NSVs header values differ from the first one!!!\n")); 483 //return -1; 484 } 485#endif /* CHECK_SUBSEQUENT_NSVS */ 486 } 487 488 nsv->state = NSV_HAS_READ_NSVS; 489 return 0; 490fail: 491 /* XXX */ 492 nsv->state = NSV_UNSYNC; 493 return -1; 494} 495 496static int nsv_read_header(AVFormatContext *s, AVFormatParameters *ap) 497{ 498 NSVContext *nsv = s->priv_data; 499 int i, err; 500 501 PRINT(("%s()\n", __FUNCTION__)); 502 PRINT(("filename '%s'\n", s->filename)); 503 504 nsv->state = NSV_UNSYNC; 505 nsv->ahead[0].data = nsv->ahead[1].data = NULL; 506 507 for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) { 508 if (nsv_resync(s) < 0) 509 return -1; 510 if (nsv->state == NSV_FOUND_NSVF) 511 err = nsv_parse_NSVf_header(s, ap); 512 /* we need the first NSVs also... */ 513 if (nsv->state == NSV_FOUND_NSVS) { 514 err = nsv_parse_NSVs_header(s, ap); 515 break; /* we just want the first one */ 516 } 517 } 518 if (s->nb_streams < 1) /* no luck so far */ 519 return -1; 520 /* now read the first chunk, so we can attempt to decode more info */ 521 err = nsv_read_chunk(s, 1); 522 523 PRINT(("parsed header\n")); 524 return 0; 525} 526 527static int nsv_read_chunk(AVFormatContext *s, int fill_header) 528{ 529 NSVContext *nsv = s->priv_data; 530 ByteIOContext *pb = s->pb; 531 AVStream *st[2] = {NULL, NULL}; 532 NSVStream *nst; 533 AVPacket *pkt; 534 int i, err = 0; 535 uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */ 536 uint32_t vsize; 537 uint16_t asize; 538 uint16_t auxsize; 539 uint32_t auxtag; 540 541 PRINT(("%s(%d)\n", __FUNCTION__, fill_header)); 542 543 if (nsv->ahead[0].data || nsv->ahead[1].data) 544 return 0; //-1; /* hey! eat what you've in your plate first! */ 545 546null_chunk_retry: 547 if (url_feof(pb)) 548 return -1; 549 550 for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++) 551 err = nsv_resync(s); 552 if (err < 0) 553 return err; 554 if (nsv->state == NSV_FOUND_NSVS) 555 err = nsv_parse_NSVs_header(s, NULL); 556 if (err < 0) 557 return err; 558 if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF) 559 return -1; 560 561 auxcount = get_byte(pb); 562 vsize = get_le16(pb); 563 asize = get_le16(pb); 564 vsize = (vsize << 4) | (auxcount >> 4); 565 auxcount &= 0x0f; 566 PRINT(("NSV CHUNK %d aux, %u bytes video, %d bytes audio\n", auxcount, vsize, asize)); 567 /* skip aux stuff */ 568 for (i = 0; i < auxcount; i++) { 569 auxsize = get_le16(pb); 570 auxtag = get_le32(pb); 571 PRINT(("NSV aux data: '%c%c%c%c', %d bytes\n", 572 (auxtag & 0x0ff), 573 ((auxtag >> 8) & 0x0ff), 574 ((auxtag >> 16) & 0x0ff), 575 ((auxtag >> 24) & 0x0ff), 576 auxsize)); 577 url_fskip(pb, auxsize); 578 vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */ 579 } 580 581 if (url_feof(pb)) 582 return -1; 583 if (!vsize && !asize) { 584 nsv->state = NSV_UNSYNC; 585 goto null_chunk_retry; 586 } 587 588 /* map back streams to v,a */ 589 if (s->streams[0]) 590 st[s->streams[0]->id] = s->streams[0]; 591 if (s->streams[1]) 592 st[s->streams[1]->id] = s->streams[1]; 593 594 if (vsize/* && st[NSV_ST_VIDEO]*/) { 595 nst = st[NSV_ST_VIDEO]->priv_data; 596 pkt = &nsv->ahead[NSV_ST_VIDEO]; 597 av_get_packet(pb, pkt, vsize); 598 pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO; 599 pkt->dts = nst->frame_offset; 600 pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */ 601/* 602 for (i = 0; i < MIN(8, vsize); i++) 603 PRINT(("NSV video: [%d] = %02x\n", i, pkt->data[i])); 604*/ 605 } 606 if(st[NSV_ST_VIDEO]) 607 ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++; 608 609 if (asize/*st[NSV_ST_AUDIO]*/) { 610 nst = st[NSV_ST_AUDIO]->priv_data; 611 pkt = &nsv->ahead[NSV_ST_AUDIO]; 612 /* read raw audio specific header on the first audio chunk... */ 613 /* on ALL audio chunks ?? seems so! */ 614 if (asize && st[NSV_ST_AUDIO]->codec->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) { 615 uint8_t bps; 616 uint8_t channels; 617 uint16_t samplerate; 618 bps = get_byte(pb); 619 channels = get_byte(pb); 620 samplerate = get_le16(pb); 621 asize-=4; 622 PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate)); 623 if (fill_header) { 624 st[NSV_ST_AUDIO]->need_parsing = AVSTREAM_PARSE_NONE; /* we know everything */ 625 if (bps != 16) { 626 PRINT(("NSV AUDIO bit/sample != 16 (%d)!!!\n", bps)); 627 } 628 bps /= channels; // ??? 629 if (bps == 8) 630 st[NSV_ST_AUDIO]->codec->codec_id = CODEC_ID_PCM_U8; 631 samplerate /= 4;/* UGH ??? XXX */ 632 channels = 1; 633 st[NSV_ST_AUDIO]->codec->channels = channels; 634 st[NSV_ST_AUDIO]->codec->sample_rate = samplerate; 635 PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate)); 636 } 637 } 638 av_get_packet(pb, pkt, asize); 639 pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO; 640 pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */ 641 if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) { 642 /* on a nsvs frame we have new information on a/v sync */ 643 pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1); 644 pkt->dts *= (int64_t)1000 * nsv->framerate.den; 645 pkt->dts += (int64_t)nsv->avsync * nsv->framerate.num; 646 PRINT(("NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts)); 647 } 648 nst->frame_offset++; 649 } 650 651 nsv->state = NSV_UNSYNC; 652 return 0; 653} 654 655 656static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt) 657{ 658 NSVContext *nsv = s->priv_data; 659 int i, err = 0; 660 661 PRINT(("%s()\n", __FUNCTION__)); 662 663 /* in case we don't already have something to eat ... */ 664 if (nsv->ahead[0].data == NULL && nsv->ahead[1].data == NULL) 665 err = nsv_read_chunk(s, 0); 666 if (err < 0) 667 return err; 668 669 /* now pick one of the plates */ 670 for (i = 0; i < 2; i++) { 671 if (nsv->ahead[i].data) { 672 PRINT(("%s: using cached packet[%d]\n", __FUNCTION__, i)); 673 /* avoid the cost of new_packet + memcpy(->data) */ 674 memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket)); 675 nsv->ahead[i].data = NULL; /* we ate that one */ 676 return pkt->size; 677 } 678 } 679 680 /* this restaurant is not approvisionned :^] */ 681 return -1; 682} 683 684static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) 685{ 686#if 0 687 NSVContext *avi = s->priv_data; 688 AVStream *st; 689 NSVStream *ast; 690 int frame_number, i; 691 int64_t pos; 692#endif 693 694 return -1; 695} 696 697static int nsv_read_close(AVFormatContext *s) 698{ 699/* int i; */ 700 NSVContext *nsv = s->priv_data; 701 702 if (nsv->index_entries) 703 av_free(nsv->nsvf_index_data); 704 705#if 0 706 707 for(i=0;i<s->nb_streams;i++) { 708 AVStream *st = s->streams[i]; 709 NSVStream *ast = st->priv_data; 710 if(ast){ 711 av_free(ast->index_entries); 712 av_free(ast); 713 } 714 av_free(st->codec->palctrl); 715 } 716 717#endif 718 return 0; 719} 720 721static int nsv_probe(AVProbeData *p) 722{ 723 int i; 724// PRINT(("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 (p->buf[i+0] == 'N' && p->buf[i+1] == 'S' && 736 p->buf[i+2] == 'V' && p->buf[i+3] == 's') 737 return AVPROBE_SCORE_MAX-20; 738 } 739 /* so we'll have more luck on extension... */ 740 if (match_ext(p->filename, "nsv")) 741 return AVPROBE_SCORE_MAX/2; 742 /* FIXME: add mime-type check */ 743 return 0; 744} 745 746AVInputFormat nsv_demuxer = { 747 "nsv", 748 NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"), 749 sizeof(NSVContext), 750 nsv_probe, 751 nsv_read_header, 752 nsv_read_packet, 753 nsv_read_close, 754 nsv_read_seek, 755}; 756