libavformat/nsvdec.c

   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
  91 struct 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
 101 struct 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
 111 struct 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
 117 struct 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
 148 enum 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
 159 typedef 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
 171 typedef 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
 187 static 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
 206 static 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);
 215 static int nsv_read_chunk(AVFormatContext *s, int fill_header);
 216
 217 #ifdef DEBUG
 218 static 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 */
 229 static 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
 276 static 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
 387 static 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;
 490 fail:
 491     /* XXX */
 492     nsv->state = NSV_UNSYNC;
 493     return -1;
 494 }
 495
 496 static 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
 527 static 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
 546 null_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
 656 static 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
 684 static 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
 697 static 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
 721 static 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
 746 AVInputFormat 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 };