Libav 0.7.1
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00001 /* 00002 * NSV demuxer 00003 * Copyright (c) 2004 The Libav Project 00004 * 00005 * This file is part of Libav. 00006 * 00007 * Libav is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * Libav is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with Libav; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 #include "avformat.h" 00022 #include "riff.h" 00023 #include "libavutil/dict.h" 00024 00025 //#define DEBUG_DUMP_INDEX // XXX dumbdriving-271.nsv breaks with it commented!! 00026 #define CHECK_SUBSEQUENT_NSVS 00027 //#define DISABLE_AUDIO 00028 00029 /* max bytes to crawl for trying to resync 00030 * stupid streaming servers don't start at chunk boundaries... 00031 */ 00032 #define NSV_MAX_RESYNC (500*1024) 00033 #define NSV_MAX_RESYNC_TRIES 300 00034 00035 /* 00036 * First version by Francois Revol - revol@free.fr 00037 * References: 00038 * (1) http://www.multimedia.cx/nsv-format.txt 00039 * seems someone came to the same conclusions as me, and updated it: 00040 * (2) http://www.stud.ktu.lt/~vitslav/nsv/nsv-format.txt 00041 * http://www.stud.ktu.lt/~vitslav/nsv/ 00042 * official docs 00043 * (3) http://ultravox.aol.com/NSVFormat.rtf 00044 * Sample files: 00045 * (S1) http://www.nullsoft.com/nsv/samples/ 00046 * http://www.nullsoft.com/nsv/samples/faster.nsv 00047 * http://streamripper.sourceforge.net/openbb/read.php?TID=492&page=4 00048 */ 00049 00050 /* 00051 * notes on the header (Francois Revol): 00052 * 00053 * It is followed by strings, then a table, but nothing tells 00054 * where the table begins according to (1). After checking faster.nsv, 00055 * I believe NVSf[16-19] gives the size of the strings data 00056 * (that is the offset of the data table after the header). 00057 * After checking all samples from (S1) all confirms this. 00058 * 00059 * Then, about NSVf[12-15], faster.nsf has 179700. When veiwing it in VLC, 00060 * I noticed there was about 1 NVSs chunk/s, so I ran 00061 * strings faster.nsv | grep NSVs | wc -l 00062 * which gave me 180. That leads me to think that NSVf[12-15] might be the 00063 * file length in milliseconds. 00064 * Let's try that: 00065 * 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 00066 * except for nstrailer (which doesn't have an NSVf header), it repports correct time. 00067 * 00068 * nsvtrailer.nsv (S1) does not have any NSVf header, only NSVs chunks, 00069 * so the header seems to not be mandatory. (for streaming). 00070 * 00071 * index slice duration check (excepts nsvtrailer.nsv): 00072 * 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 00073 */ 00074 00075 /* 00076 * TODO: 00077 * - handle timestamps !!! 00078 * - use index 00079 * - mime-type in probe() 00080 * - seek 00081 */ 00082 00083 #if 0 00084 struct NSVf_header { 00085 uint32_t chunk_tag; /* 'NSVf' */ 00086 uint32_t chunk_size; 00087 uint32_t file_size; /* max 4GB ??? no one learns anything it seems :^) */ 00088 uint32_t file_length; //unknown1; /* what about MSB of file_size ? */ 00089 uint32_t info_strings_size; /* size of the info strings */ //unknown2; 00090 uint32_t table_entries; 00091 uint32_t table_entries_used; /* the left ones should be -1 */ 00092 }; 00093 00094 struct NSVs_header { 00095 uint32_t chunk_tag; /* 'NSVs' */ 00096 uint32_t v4cc; /* or 'NONE' */ 00097 uint32_t a4cc; /* or 'NONE' */ 00098 uint16_t vwidth; /* assert(vwidth%16==0) */ 00099 uint16_t vheight; /* assert(vheight%16==0) */ 00100 uint8_t framerate; /* value = (framerate&0x80)?frtable[frameratex0x7f]:framerate */ 00101 uint16_t unknown; 00102 }; 00103 00104 struct nsv_avchunk_header { 00105 uint8_t vchunk_size_lsb; 00106 uint16_t vchunk_size_msb; /* value = (vchunk_size_msb << 4) | (vchunk_size_lsb >> 4) */ 00107 uint16_t achunk_size; 00108 }; 00109 00110 struct nsv_pcm_header { 00111 uint8_t bits_per_sample; 00112 uint8_t channel_count; 00113 uint16_t sample_rate; 00114 }; 00115 #endif 00116 00117 /* variation from avi.h */ 00118 /*typedef struct CodecTag { 00119 int id; 00120 unsigned int tag; 00121 } CodecTag;*/ 00122 00123 /* tags */ 00124 00125 #define T_NSVF MKTAG('N', 'S', 'V', 'f') /* file header */ 00126 #define T_NSVS MKTAG('N', 'S', 'V', 's') /* chunk header */ 00127 #define T_TOC2 MKTAG('T', 'O', 'C', '2') /* extra index marker */ 00128 #define T_NONE MKTAG('N', 'O', 'N', 'E') /* null a/v 4CC */ 00129 #define T_SUBT MKTAG('S', 'U', 'B', 'T') /* subtitle aux data */ 00130 #define T_ASYN MKTAG('A', 'S', 'Y', 'N') /* async a/v aux marker */ 00131 #define T_KEYF MKTAG('K', 'E', 'Y', 'F') /* video keyframe aux marker (addition) */ 00132 00133 #define TB_NSVF MKBETAG('N', 'S', 'V', 'f') 00134 #define TB_NSVS MKBETAG('N', 'S', 'V', 's') 00135 00136 /* hardcoded stream indexes */ 00137 #define NSV_ST_VIDEO 0 00138 #define NSV_ST_AUDIO 1 00139 #define NSV_ST_SUBT 2 00140 00141 enum NSVStatus { 00142 NSV_UNSYNC, 00143 NSV_FOUND_NSVF, 00144 NSV_HAS_READ_NSVF, 00145 NSV_FOUND_NSVS, 00146 NSV_HAS_READ_NSVS, 00147 NSV_FOUND_BEEF, 00148 NSV_GOT_VIDEO, 00149 NSV_GOT_AUDIO, 00150 }; 00151 00152 typedef struct NSVStream { 00153 int frame_offset; /* current frame (video) or byte (audio) counter 00154 (used to compute the pts) */ 00155 int scale; 00156 int rate; 00157 int sample_size; /* audio only data */ 00158 int start; 00159 00160 int new_frame_offset; /* temporary storage (used during seek) */ 00161 int cum_len; /* temporary storage (used during seek) */ 00162 } NSVStream; 00163 00164 typedef struct { 00165 int base_offset; 00166 int NSVf_end; 00167 uint32_t *nsvs_file_offset; 00168 int index_entries; 00169 enum NSVStatus state; 00170 AVPacket ahead[2]; /* [v, a] if .data is !NULL there is something */ 00171 /* cached */ 00172 int64_t duration; 00173 uint32_t vtag, atag; 00174 uint16_t vwidth, vheight; 00175 int16_t avsync; 00176 AVRational framerate; 00177 uint32_t *nsvs_timestamps; 00178 //DVDemuxContext* dv_demux; 00179 } NSVContext; 00180 00181 static const AVCodecTag nsv_codec_video_tags[] = { 00182 { CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') }, 00183 { CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') }, 00184 { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') }, 00185 { CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') }, 00186 { CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') }, 00187 { CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') }, 00188 { CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') }, 00189 { CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') }, 00190 { CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') }, 00191 /* 00192 { CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') }, 00193 { CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') }, 00194 */ 00195 { CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */ 00196 { CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') }, 00197 { CODEC_ID_NONE, 0 }, 00198 }; 00199 00200 static const AVCodecTag nsv_codec_audio_tags[] = { 00201 { CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') }, 00202 { CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') }, 00203 { CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') }, 00204 { CODEC_ID_SPEEX, MKTAG('S', 'P', 'X', ' ') }, 00205 { CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') }, 00206 { CODEC_ID_NONE, 0 }, 00207 }; 00208 00209 //static int nsv_load_index(AVFormatContext *s); 00210 static int nsv_read_chunk(AVFormatContext *s, int fill_header); 00211 00212 #define print_tag(str, tag, size) \ 00213 av_dlog(NULL, "%s: tag=%c%c%c%c\n", \ 00214 str, tag & 0xff, \ 00215 (tag >> 8) & 0xff, \ 00216 (tag >> 16) & 0xff, \ 00217 (tag >> 24) & 0xff); 00218 00219 /* try to find something we recognize, and set the state accordingly */ 00220 static int nsv_resync(AVFormatContext *s) 00221 { 00222 NSVContext *nsv = s->priv_data; 00223 AVIOContext *pb = s->pb; 00224 uint32_t v = 0; 00225 int i; 00226 00227 av_dlog(s, "%s(), offset = %"PRId64", state = %d\n", __FUNCTION__, avio_tell(pb), nsv->state); 00228 00229 //nsv->state = NSV_UNSYNC; 00230 00231 for (i = 0; i < NSV_MAX_RESYNC; i++) { 00232 if (pb->eof_reached) { 00233 av_dlog(s, "NSV EOF\n"); 00234 nsv->state = NSV_UNSYNC; 00235 return -1; 00236 } 00237 v <<= 8; 00238 v |= avio_r8(pb); 00239 if (i < 8) { 00240 av_dlog(s, "NSV resync: [%d] = %02x\n", i, v & 0x0FF); 00241 } 00242 00243 if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */ 00244 av_dlog(s, "NSV resynced on BEEF after %d bytes\n", i+1); 00245 nsv->state = NSV_FOUND_BEEF; 00246 return 0; 00247 } 00248 /* we read as big endian, thus the MK*BE* */ 00249 if (v == TB_NSVF) { /* NSVf */ 00250 av_dlog(s, "NSV resynced on NSVf after %d bytes\n", i+1); 00251 nsv->state = NSV_FOUND_NSVF; 00252 return 0; 00253 } 00254 if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */ 00255 av_dlog(s, "NSV resynced on NSVs after %d bytes\n", i+1); 00256 nsv->state = NSV_FOUND_NSVS; 00257 return 0; 00258 } 00259 00260 } 00261 av_dlog(s, "NSV sync lost\n"); 00262 return -1; 00263 } 00264 00265 static int nsv_parse_NSVf_header(AVFormatContext *s, AVFormatParameters *ap) 00266 { 00267 NSVContext *nsv = s->priv_data; 00268 AVIOContext *pb = s->pb; 00269 unsigned int av_unused file_size; 00270 unsigned int size; 00271 int64_t duration; 00272 int strings_size; 00273 int table_entries; 00274 int table_entries_used; 00275 00276 av_dlog(s, "%s()\n", __FUNCTION__); 00277 00278 nsv->state = NSV_UNSYNC; /* in case we fail */ 00279 00280 size = avio_rl32(pb); 00281 if (size < 28) 00282 return -1; 00283 nsv->NSVf_end = size; 00284 00285 //s->file_size = (uint32_t)avio_rl32(pb); 00286 file_size = (uint32_t)avio_rl32(pb); 00287 av_dlog(s, "NSV NSVf chunk_size %u\n", size); 00288 av_dlog(s, "NSV NSVf file_size %u\n", file_size); 00289 00290 nsv->duration = duration = avio_rl32(pb); /* in ms */ 00291 av_dlog(s, "NSV NSVf duration %"PRId64" ms\n", duration); 00292 // XXX: store it in AVStreams 00293 00294 strings_size = avio_rl32(pb); 00295 table_entries = avio_rl32(pb); 00296 table_entries_used = avio_rl32(pb); 00297 av_dlog(s, "NSV NSVf info-strings size: %d, table entries: %d, bis %d\n", 00298 strings_size, table_entries, table_entries_used); 00299 if (pb->eof_reached) 00300 return -1; 00301 00302 av_dlog(s, "NSV got header; filepos %"PRId64"\n", avio_tell(pb)); 00303 00304 if (strings_size > 0) { 00305 char *strings; /* last byte will be '\0' to play safe with str*() */ 00306 char *p, *endp; 00307 char *token, *value; 00308 char quote; 00309 00310 p = strings = av_mallocz((size_t)strings_size + 1); 00311 if (!p) 00312 return AVERROR(ENOMEM); 00313 endp = strings + strings_size; 00314 avio_read(pb, strings, strings_size); 00315 while (p < endp) { 00316 while (*p == ' ') 00317 p++; /* strip out spaces */ 00318 if (p >= endp-2) 00319 break; 00320 token = p; 00321 p = strchr(p, '='); 00322 if (!p || p >= endp-2) 00323 break; 00324 *p++ = '\0'; 00325 quote = *p++; 00326 value = p; 00327 p = strchr(p, quote); 00328 if (!p || p >= endp) 00329 break; 00330 *p++ = '\0'; 00331 av_dlog(s, "NSV NSVf INFO: %s='%s'\n", token, value); 00332 av_dict_set(&s->metadata, token, value, 0); 00333 } 00334 av_free(strings); 00335 } 00336 if (pb->eof_reached) 00337 return -1; 00338 00339 av_dlog(s, "NSV got infos; filepos %"PRId64"\n", avio_tell(pb)); 00340 00341 if (table_entries_used > 0) { 00342 int i; 00343 nsv->index_entries = table_entries_used; 00344 if((unsigned)table_entries_used >= UINT_MAX / sizeof(uint32_t)) 00345 return -1; 00346 nsv->nsvs_file_offset = av_malloc((unsigned)table_entries_used * sizeof(uint32_t)); 00347 if (!nsv->nsvs_file_offset) 00348 return AVERROR(ENOMEM); 00349 00350 for(i=0;i<table_entries_used;i++) 00351 nsv->nsvs_file_offset[i] = avio_rl32(pb) + size; 00352 00353 if(table_entries > table_entries_used && 00354 avio_rl32(pb) == MKTAG('T','O','C','2')) { 00355 nsv->nsvs_timestamps = av_malloc((unsigned)table_entries_used*sizeof(uint32_t)); 00356 if (!nsv->nsvs_timestamps) 00357 return AVERROR(ENOMEM); 00358 for(i=0;i<table_entries_used;i++) { 00359 nsv->nsvs_timestamps[i] = avio_rl32(pb); 00360 } 00361 } 00362 } 00363 00364 av_dlog(s, "NSV got index; filepos %"PRId64"\n", avio_tell(pb)); 00365 00366 #ifdef DEBUG_DUMP_INDEX 00367 #define V(v) ((v<0x20 || v > 127)?'.':v) 00368 /* dump index */ 00369 av_dlog(s, "NSV %d INDEX ENTRIES:\n", table_entries); 00370 av_dlog(s, "NSV [dataoffset][fileoffset]\n", table_entries); 00371 for (i = 0; i < table_entries; i++) { 00372 unsigned char b[8]; 00373 avio_seek(pb, size + nsv->nsvs_file_offset[i], SEEK_SET); 00374 avio_read(pb, b, 8); 00375 av_dlog(s, "NSV [0x%08lx][0x%08lx]: %02x %02x %02x %02x %02x %02x %02x %02x" 00376 "%c%c%c%c%c%c%c%c\n", 00377 nsv->nsvs_file_offset[i], size + nsv->nsvs_file_offset[i], 00378 b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7], 00379 V(b[0]), V(b[1]), V(b[2]), V(b[3]), V(b[4]), V(b[5]), V(b[6]), V(b[7]) ); 00380 } 00381 //avio_seek(pb, size, SEEK_SET); /* go back to end of header */ 00382 #undef V 00383 #endif 00384 00385 avio_seek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */ 00386 00387 if (pb->eof_reached) 00388 return -1; 00389 nsv->state = NSV_HAS_READ_NSVF; 00390 return 0; 00391 } 00392 00393 static int nsv_parse_NSVs_header(AVFormatContext *s, AVFormatParameters *ap) 00394 { 00395 NSVContext *nsv = s->priv_data; 00396 AVIOContext *pb = s->pb; 00397 uint32_t vtag, atag; 00398 uint16_t vwidth, vheight; 00399 AVRational framerate; 00400 int i; 00401 AVStream *st; 00402 NSVStream *nst; 00403 av_dlog(s, "%s()\n", __FUNCTION__); 00404 00405 vtag = avio_rl32(pb); 00406 atag = avio_rl32(pb); 00407 vwidth = avio_rl16(pb); 00408 vheight = avio_rl16(pb); 00409 i = avio_r8(pb); 00410 00411 av_dlog(s, "NSV NSVs framerate code %2x\n", i); 00412 if(i&0x80) { /* odd way of giving native framerates from docs */ 00413 int t=(i & 0x7F)>>2; 00414 if(t<16) framerate = (AVRational){1, t+1}; 00415 else framerate = (AVRational){t-15, 1}; 00416 00417 if(i&1){ 00418 framerate.num *= 1000; 00419 framerate.den *= 1001; 00420 } 00421 00422 if((i&3)==3) framerate.num *= 24; 00423 else if((i&3)==2) framerate.num *= 25; 00424 else framerate.num *= 30; 00425 } 00426 else 00427 framerate= (AVRational){i, 1}; 00428 00429 nsv->avsync = avio_rl16(pb); 00430 nsv->framerate = framerate; 00431 00432 print_tag("NSV NSVs vtag", vtag, 0); 00433 print_tag("NSV NSVs atag", atag, 0); 00434 av_dlog(s, "NSV NSVs vsize %dx%d\n", vwidth, vheight); 00435 00436 /* XXX change to ap != NULL ? */ 00437 if (s->nb_streams == 0) { /* streams not yet published, let's do that */ 00438 nsv->vtag = vtag; 00439 nsv->atag = atag; 00440 nsv->vwidth = vwidth; 00441 nsv->vheight = vwidth; 00442 if (vtag != T_NONE) { 00443 int i; 00444 st = av_new_stream(s, NSV_ST_VIDEO); 00445 if (!st) 00446 goto fail; 00447 00448 nst = av_mallocz(sizeof(NSVStream)); 00449 if (!nst) 00450 goto fail; 00451 st->priv_data = nst; 00452 st->codec->codec_type = AVMEDIA_TYPE_VIDEO; 00453 st->codec->codec_tag = vtag; 00454 st->codec->codec_id = ff_codec_get_id(nsv_codec_video_tags, vtag); 00455 st->codec->width = vwidth; 00456 st->codec->height = vheight; 00457 st->codec->bits_per_coded_sample = 24; /* depth XXX */ 00458 00459 av_set_pts_info(st, 64, framerate.den, framerate.num); 00460 st->start_time = 0; 00461 st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den); 00462 00463 for(i=0;i<nsv->index_entries;i++) { 00464 if(nsv->nsvs_timestamps) { 00465 av_add_index_entry(st, nsv->nsvs_file_offset[i], nsv->nsvs_timestamps[i], 00466 0, 0, AVINDEX_KEYFRAME); 00467 } else { 00468 int64_t ts = av_rescale(i*nsv->duration/nsv->index_entries, framerate.num, 1000*framerate.den); 00469 av_add_index_entry(st, nsv->nsvs_file_offset[i], ts, 0, 0, AVINDEX_KEYFRAME); 00470 } 00471 } 00472 } 00473 if (atag != T_NONE) { 00474 #ifndef DISABLE_AUDIO 00475 st = av_new_stream(s, NSV_ST_AUDIO); 00476 if (!st) 00477 goto fail; 00478 00479 nst = av_mallocz(sizeof(NSVStream)); 00480 if (!nst) 00481 goto fail; 00482 st->priv_data = nst; 00483 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 00484 st->codec->codec_tag = atag; 00485 st->codec->codec_id = ff_codec_get_id(nsv_codec_audio_tags, atag); 00486 00487 st->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */ 00488 00489 /* set timebase to common denominator of ms and framerate */ 00490 av_set_pts_info(st, 64, 1, framerate.num*1000); 00491 st->start_time = 0; 00492 st->duration = (int64_t)nsv->duration * framerate.num; 00493 #endif 00494 } 00495 #ifdef CHECK_SUBSEQUENT_NSVS 00496 } else { 00497 if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) { 00498 av_dlog(s, "NSV NSVs header values differ from the first one!!!\n"); 00499 //return -1; 00500 } 00501 #endif /* CHECK_SUBSEQUENT_NSVS */ 00502 } 00503 00504 nsv->state = NSV_HAS_READ_NSVS; 00505 return 0; 00506 fail: 00507 /* XXX */ 00508 nsv->state = NSV_UNSYNC; 00509 return -1; 00510 } 00511 00512 static int nsv_read_header(AVFormatContext *s, AVFormatParameters *ap) 00513 { 00514 NSVContext *nsv = s->priv_data; 00515 int i, err; 00516 00517 av_dlog(s, "%s()\n", __FUNCTION__); 00518 av_dlog(s, "filename '%s'\n", s->filename); 00519 00520 nsv->state = NSV_UNSYNC; 00521 nsv->ahead[0].data = nsv->ahead[1].data = NULL; 00522 00523 for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) { 00524 if (nsv_resync(s) < 0) 00525 return -1; 00526 if (nsv->state == NSV_FOUND_NSVF) { 00527 err = nsv_parse_NSVf_header(s, ap); 00528 if (err < 0) 00529 return err; 00530 } 00531 /* we need the first NSVs also... */ 00532 if (nsv->state == NSV_FOUND_NSVS) { 00533 err = nsv_parse_NSVs_header(s, ap); 00534 if (err < 0) 00535 return err; 00536 break; /* we just want the first one */ 00537 } 00538 } 00539 if (s->nb_streams < 1) /* no luck so far */ 00540 return -1; 00541 /* now read the first chunk, so we can attempt to decode more info */ 00542 err = nsv_read_chunk(s, 1); 00543 00544 av_dlog(s, "parsed header\n"); 00545 return err; 00546 } 00547 00548 static int nsv_read_chunk(AVFormatContext *s, int fill_header) 00549 { 00550 NSVContext *nsv = s->priv_data; 00551 AVIOContext *pb = s->pb; 00552 AVStream *st[2] = {NULL, NULL}; 00553 NSVStream *nst; 00554 AVPacket *pkt; 00555 int i, err = 0; 00556 uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */ 00557 uint32_t vsize; 00558 uint16_t asize; 00559 uint16_t auxsize; 00560 uint32_t av_unused auxtag; 00561 00562 av_dlog(s, "%s(%d)\n", __FUNCTION__, fill_header); 00563 00564 if (nsv->ahead[0].data || nsv->ahead[1].data) 00565 return 0; //-1; /* hey! eat what you've in your plate first! */ 00566 00567 null_chunk_retry: 00568 if (pb->eof_reached) 00569 return -1; 00570 00571 for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++) 00572 err = nsv_resync(s); 00573 if (err < 0) 00574 return err; 00575 if (nsv->state == NSV_FOUND_NSVS) 00576 err = nsv_parse_NSVs_header(s, NULL); 00577 if (err < 0) 00578 return err; 00579 if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF) 00580 return -1; 00581 00582 auxcount = avio_r8(pb); 00583 vsize = avio_rl16(pb); 00584 asize = avio_rl16(pb); 00585 vsize = (vsize << 4) | (auxcount >> 4); 00586 auxcount &= 0x0f; 00587 av_dlog(s, "NSV CHUNK %d aux, %u bytes video, %d bytes audio\n", auxcount, vsize, asize); 00588 /* skip aux stuff */ 00589 for (i = 0; i < auxcount; i++) { 00590 auxsize = avio_rl16(pb); 00591 auxtag = avio_rl32(pb); 00592 av_dlog(s, "NSV aux data: '%c%c%c%c', %d bytes\n", 00593 (auxtag & 0x0ff), 00594 ((auxtag >> 8) & 0x0ff), 00595 ((auxtag >> 16) & 0x0ff), 00596 ((auxtag >> 24) & 0x0ff), 00597 auxsize); 00598 avio_skip(pb, auxsize); 00599 vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */ 00600 } 00601 00602 if (pb->eof_reached) 00603 return -1; 00604 if (!vsize && !asize) { 00605 nsv->state = NSV_UNSYNC; 00606 goto null_chunk_retry; 00607 } 00608 00609 /* map back streams to v,a */ 00610 if (s->nb_streams > 0) 00611 st[s->streams[0]->id] = s->streams[0]; 00612 if (s->nb_streams > 1) 00613 st[s->streams[1]->id] = s->streams[1]; 00614 00615 if (vsize && st[NSV_ST_VIDEO]) { 00616 nst = st[NSV_ST_VIDEO]->priv_data; 00617 pkt = &nsv->ahead[NSV_ST_VIDEO]; 00618 av_get_packet(pb, pkt, vsize); 00619 pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO; 00620 pkt->dts = nst->frame_offset; 00621 pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */ 00622 for (i = 0; i < FFMIN(8, vsize); i++) 00623 av_dlog(s, "NSV video: [%d] = %02x\n", i, pkt->data[i]); 00624 } 00625 if(st[NSV_ST_VIDEO]) 00626 ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++; 00627 00628 if (asize && st[NSV_ST_AUDIO]) { 00629 nst = st[NSV_ST_AUDIO]->priv_data; 00630 pkt = &nsv->ahead[NSV_ST_AUDIO]; 00631 /* read raw audio specific header on the first audio chunk... */ 00632 /* on ALL audio chunks ?? seems so! */ 00633 if (asize && st[NSV_ST_AUDIO]->codec->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) { 00634 uint8_t bps; 00635 uint8_t channels; 00636 uint16_t samplerate; 00637 bps = avio_r8(pb); 00638 channels = avio_r8(pb); 00639 samplerate = avio_rl16(pb); 00640 asize-=4; 00641 av_dlog(s, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate); 00642 if (fill_header) { 00643 st[NSV_ST_AUDIO]->need_parsing = AVSTREAM_PARSE_NONE; /* we know everything */ 00644 if (bps != 16) { 00645 av_dlog(s, "NSV AUDIO bit/sample != 16 (%d)!!!\n", bps); 00646 } 00647 bps /= channels; // ??? 00648 if (bps == 8) 00649 st[NSV_ST_AUDIO]->codec->codec_id = CODEC_ID_PCM_U8; 00650 samplerate /= 4;/* UGH ??? XXX */ 00651 channels = 1; 00652 st[NSV_ST_AUDIO]->codec->channels = channels; 00653 st[NSV_ST_AUDIO]->codec->sample_rate = samplerate; 00654 av_dlog(s, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate); 00655 } 00656 } 00657 av_get_packet(pb, pkt, asize); 00658 pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO; 00659 pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */ 00660 if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) { 00661 /* on a nsvs frame we have new information on a/v sync */ 00662 pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1); 00663 pkt->dts *= (int64_t)1000 * nsv->framerate.den; 00664 pkt->dts += (int64_t)nsv->avsync * nsv->framerate.num; 00665 av_dlog(s, "NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts); 00666 } 00667 nst->frame_offset++; 00668 } 00669 00670 nsv->state = NSV_UNSYNC; 00671 return 0; 00672 } 00673 00674 00675 static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt) 00676 { 00677 NSVContext *nsv = s->priv_data; 00678 int i, err = 0; 00679 00680 av_dlog(s, "%s()\n", __FUNCTION__); 00681 00682 /* in case we don't already have something to eat ... */ 00683 if (nsv->ahead[0].data == NULL && nsv->ahead[1].data == NULL) 00684 err = nsv_read_chunk(s, 0); 00685 if (err < 0) 00686 return err; 00687 00688 /* now pick one of the plates */ 00689 for (i = 0; i < 2; i++) { 00690 if (nsv->ahead[i].data) { 00691 av_dlog(s, "%s: using cached packet[%d]\n", __FUNCTION__, i); 00692 /* avoid the cost of new_packet + memcpy(->data) */ 00693 memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket)); 00694 nsv->ahead[i].data = NULL; /* we ate that one */ 00695 return pkt->size; 00696 } 00697 } 00698 00699 /* this restaurant is not approvisionned :^] */ 00700 return -1; 00701 } 00702 00703 static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) 00704 { 00705 NSVContext *nsv = s->priv_data; 00706 AVStream *st = s->streams[stream_index]; 00707 NSVStream *nst = st->priv_data; 00708 int index; 00709 00710 index = av_index_search_timestamp(st, timestamp, flags); 00711 if(index < 0) 00712 return -1; 00713 00714 avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET); 00715 nst->frame_offset = st->index_entries[index].timestamp; 00716 nsv->state = NSV_UNSYNC; 00717 return 0; 00718 } 00719 00720 static int nsv_read_close(AVFormatContext *s) 00721 { 00722 /* int i; */ 00723 NSVContext *nsv = s->priv_data; 00724 00725 av_freep(&nsv->nsvs_file_offset); 00726 av_freep(&nsv->nsvs_timestamps); 00727 if (nsv->ahead[0].data) 00728 av_free_packet(&nsv->ahead[0]); 00729 if (nsv->ahead[1].data) 00730 av_free_packet(&nsv->ahead[1]); 00731 00732 #if 0 00733 00734 for(i=0;i<s->nb_streams;i++) { 00735 AVStream *st = s->streams[i]; 00736 NSVStream *ast = st->priv_data; 00737 if(ast){ 00738 av_free(ast->index_entries); 00739 av_free(ast); 00740 } 00741 av_free(st->codec->palctrl); 00742 } 00743 00744 #endif 00745 return 0; 00746 } 00747 00748 static int nsv_probe(AVProbeData *p) 00749 { 00750 int i; 00751 int score; 00752 int vsize, asize, auxcount; 00753 score = 0; 00754 av_dlog(NULL, "nsv_probe(), buf_size %d\n", p->buf_size); 00755 /* check file header */ 00756 /* streamed files might not have any header */ 00757 if (p->buf[0] == 'N' && p->buf[1] == 'S' && 00758 p->buf[2] == 'V' && (p->buf[3] == 'f' || p->buf[3] == 's')) 00759 return AVPROBE_SCORE_MAX; 00760 /* XXX: do streamed files always start at chunk boundary ?? */ 00761 /* or do we need to search NSVs in the byte stream ? */ 00762 /* seems the servers don't bother starting clean chunks... */ 00763 /* sometimes even the first header is at 9KB or something :^) */ 00764 for (i = 1; i < p->buf_size - 3; i++) { 00765 if (p->buf[i+0] == 'N' && p->buf[i+1] == 'S' && 00766 p->buf[i+2] == 'V' && p->buf[i+3] == 's') { 00767 score = AVPROBE_SCORE_MAX/5; 00768 /* Get the chunk size and check if at the end we are getting 0xBEEF */ 00769 auxcount = p->buf[i+19]; 00770 vsize = p->buf[i+20] | p->buf[i+21] << 8; 00771 asize = p->buf[i+22] | p->buf[i+23] << 8; 00772 vsize = (vsize << 4) | (auxcount >> 4); 00773 if ((asize + vsize + i + 23) < p->buf_size - 2) { 00774 if (p->buf[i+23+asize+vsize+1] == 0xEF && 00775 p->buf[i+23+asize+vsize+2] == 0xBE) 00776 return AVPROBE_SCORE_MAX-20; 00777 } 00778 } 00779 } 00780 /* so we'll have more luck on extension... */ 00781 if (av_match_ext(p->filename, "nsv")) 00782 return AVPROBE_SCORE_MAX/2; 00783 /* FIXME: add mime-type check */ 00784 return score; 00785 } 00786 00787 AVInputFormat ff_nsv_demuxer = { 00788 "nsv", 00789 NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"), 00790 sizeof(NSVContext), 00791 nsv_probe, 00792 nsv_read_header, 00793 nsv_read_packet, 00794 nsv_read_close, 00795 nsv_read_seek, 00796 };