| 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 |
| 85 | struct 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 | |
| 95 | struct 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_assert0(vwidth%16==0) */ |
| 100 | uint16_t vheight; /* av_assert0(vheight%16==0) */ |
| 101 | uint8_t framerate; /* value = (framerate&0x80)?frtable[frameratex0x7f]:framerate */ |
| 102 | uint16_t unknown; |
| 103 | }; |
| 104 | |
| 105 | struct 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 | |
| 111 | struct 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 | |
| 142 | enum 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 | |
| 153 | typedef 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 | |
| 165 | typedef 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 | |
| 182 | static 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 | |
| 202 | static 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); |
| 213 | static 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 */ |
| 223 | static 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 (avio_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 | |
| 268 | static 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 (avio_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 (avio_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 (avio_feof(pb)) |
| 372 | return -1; |
| 373 | nsv->state = NSV_HAS_READ_NSVF; |
| 374 | return 0; |
| 375 | } |
| 376 | |
| 377 | static 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; |
| 488 | fail: |
| 489 | /* XXX */ |
| 490 | nsv->state = NSV_UNSYNC; |
| 491 | return -1; |
| 492 | } |
| 493 | |
| 494 | static 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 | |
| 530 | static 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 | |
| 548 | null_chunk_retry: |
| 549 | if (avio_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 (avio_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 | |
| 660 | static 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 && !nsv->ahead[1].data) |
| 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 | |
| 688 | static 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 | |
| 707 | static 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 | |
| 720 | static 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 | |
| 752 | AVInputFormat 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 | }; |