FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
nsvdec.c
Go to the documentation of this file.
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 viewing 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 nsvtrailer (which doesn't have an NSVf header), it reports 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 {
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 NSVContext {
167  int NSVf_end;
168  uint32_t *nsvs_file_offset;
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;
178  uint32_t *nsvs_timestamps;
179 } NSVContext;
180 
182  { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
183  { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
184  { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
185  { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') },
186  { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
187  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
188  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
189  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
190  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
191  { AV_CODEC_ID_VP8, MKTAG('V', 'P', '8', '0') },
192 /*
193  { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
194  { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
195 */
196  { AV_CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
197  { AV_CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
198  { AV_CODEC_ID_NONE, 0 },
199 };
200 
202  { AV_CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') },
203  { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') },
204  { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') },
205  { AV_CODEC_ID_AAC, MKTAG('V', 'L', 'B', ' ') },
206  { AV_CODEC_ID_SPEEX, MKTAG('S', 'P', 'X', ' ') },
207  { AV_CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
208  { AV_CODEC_ID_NONE, 0 },
209 };
210 
211 //static int nsv_load_index(AVFormatContext *s);
212 static int nsv_read_chunk(AVFormatContext *s, int fill_header);
213 
214 /* try to find something we recognize, and set the state accordingly */
216 {
217  NSVContext *nsv = s->priv_data;
218  AVIOContext *pb = s->pb;
219  uint32_t v = 0;
220  int i;
221 
222  for (i = 0; i < NSV_MAX_RESYNC; i++) {
223  if (avio_feof(pb)) {
224  av_log(s, AV_LOG_TRACE, "NSV EOF\n");
225  nsv->state = NSV_UNSYNC;
226  return -1;
227  }
228  v <<= 8;
229  v |= avio_r8(pb);
230  if (i < 8) {
231  av_log(s, AV_LOG_TRACE, "NSV resync: [%d] = %02"PRIx32"\n", i, v & 0x0FF);
232  }
233 
234  if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
235  av_log(s, AV_LOG_TRACE, "NSV resynced on BEEF after %d bytes\n", i+1);
236  nsv->state = NSV_FOUND_BEEF;
237  return 0;
238  }
239  /* we read as big-endian, thus the MK*BE* */
240  if (v == TB_NSVF) { /* NSVf */
241  av_log(s, AV_LOG_TRACE, "NSV resynced on NSVf after %d bytes\n", i+1);
242  nsv->state = NSV_FOUND_NSVF;
243  return 0;
244  }
245  if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
246  av_log(s, AV_LOG_TRACE, "NSV resynced on NSVs after %d bytes\n", i+1);
247  nsv->state = NSV_FOUND_NSVS;
248  return 0;
249  }
250 
251  }
252  av_log(s, AV_LOG_TRACE, "NSV sync lost\n");
253  return -1;
254 }
255 
257 {
258  NSVContext *nsv = s->priv_data;
259  AVIOContext *pb = s->pb;
260  unsigned int av_unused file_size;
261  unsigned int size;
262  int64_t duration;
263  int strings_size;
264  int table_entries;
265  int table_entries_used;
266 
267  nsv->state = NSV_UNSYNC; /* in case we fail */
268 
269  size = avio_rl32(pb);
270  if (size < 28)
271  return -1;
272  nsv->NSVf_end = size;
273 
274  file_size = (uint32_t)avio_rl32(pb);
275  av_log(s, AV_LOG_TRACE, "NSV NSVf chunk_size %u\n", size);
276  av_log(s, AV_LOG_TRACE, "NSV NSVf file_size %u\n", file_size);
277 
278  nsv->duration = duration = avio_rl32(pb); /* in ms */
279  av_log(s, AV_LOG_TRACE, "NSV NSVf duration %"PRId64" ms\n", duration);
280  // XXX: store it in AVStreams
281 
282  strings_size = avio_rl32(pb);
283  table_entries = avio_rl32(pb);
284  table_entries_used = avio_rl32(pb);
285  av_log(s, AV_LOG_TRACE, "NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
286  strings_size, table_entries, table_entries_used);
287  if (avio_feof(pb))
288  return -1;
289 
290  av_log(s, AV_LOG_TRACE, "NSV got header; filepos %"PRId64"\n", avio_tell(pb));
291 
292  if (strings_size > 0) {
293  char *strings; /* last byte will be '\0' to play safe with str*() */
294  char *p, *endp;
295  char *token, *value;
296  char quote;
297 
298  p = strings = av_mallocz((size_t)strings_size + 1);
299  if (!p)
300  return AVERROR(ENOMEM);
301  endp = strings + strings_size;
302  avio_read(pb, strings, strings_size);
303  while (p < endp) {
304  while (*p == ' ')
305  p++; /* strip out spaces */
306  if (p >= endp-2)
307  break;
308  token = p;
309  p = strchr(p, '=');
310  if (!p || p >= endp-2)
311  break;
312  *p++ = '\0';
313  quote = *p++;
314  value = p;
315  p = strchr(p, quote);
316  if (!p || p >= endp)
317  break;
318  *p++ = '\0';
319  av_log(s, AV_LOG_TRACE, "NSV NSVf INFO: %s='%s'\n", token, value);
320  av_dict_set(&s->metadata, token, value, 0);
321  }
322  av_free(strings);
323  }
324  if (avio_feof(pb))
325  return -1;
326 
327  av_log(s, AV_LOG_TRACE, "NSV got infos; filepos %"PRId64"\n", avio_tell(pb));
328 
329  if (table_entries_used > 0) {
330  int i;
331  nsv->index_entries = table_entries_used;
332  if((unsigned)table_entries_used >= UINT_MAX / sizeof(uint32_t))
333  return -1;
334  nsv->nsvs_file_offset = av_malloc_array((unsigned)table_entries_used, sizeof(uint32_t));
335  if (!nsv->nsvs_file_offset)
336  return AVERROR(ENOMEM);
337 
338  for(i=0;i<table_entries_used;i++)
339  nsv->nsvs_file_offset[i] = avio_rl32(pb) + size;
340 
341  if(table_entries > table_entries_used &&
342  avio_rl32(pb) == MKTAG('T','O','C','2')) {
343  nsv->nsvs_timestamps = av_malloc_array((unsigned)table_entries_used, sizeof(uint32_t));
344  if (!nsv->nsvs_timestamps)
345  return AVERROR(ENOMEM);
346  for(i=0;i<table_entries_used;i++) {
347  nsv->nsvs_timestamps[i] = avio_rl32(pb);
348  }
349  }
350  }
351 
352  av_log(s, AV_LOG_TRACE, "NSV got index; filepos %"PRId64"\n", avio_tell(pb));
353 
354  avio_seek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
355 
356  if (avio_feof(pb))
357  return -1;
358  nsv->state = NSV_HAS_READ_NSVF;
359  return 0;
360 }
361 
363 {
364  NSVContext *nsv = s->priv_data;
365  AVIOContext *pb = s->pb;
366  uint32_t vtag, atag;
367  uint16_t vwidth, vheight;
368  AVRational framerate;
369  int i;
370  AVStream *st;
371  NSVStream *nst;
372 
373  vtag = avio_rl32(pb);
374  atag = avio_rl32(pb);
375  vwidth = avio_rl16(pb);
376  vheight = avio_rl16(pb);
377  i = avio_r8(pb);
378 
379  av_log(s, AV_LOG_TRACE, "NSV NSVs framerate code %2x\n", i);
380  if(i&0x80) { /* odd way of giving native framerates from docs */
381  int t=(i & 0x7F)>>2;
382  if(t<16) framerate = (AVRational){1, t+1};
383  else framerate = (AVRational){t-15, 1};
384 
385  if(i&1){
386  framerate.num *= 1000;
387  framerate.den *= 1001;
388  }
389 
390  if((i&3)==3) framerate.num *= 24;
391  else if((i&3)==2) framerate.num *= 25;
392  else framerate.num *= 30;
393  }
394  else
395  framerate= (AVRational){i, 1};
396 
397  nsv->avsync = avio_rl16(pb);
398  nsv->framerate = framerate;
399 
400  av_log(s, AV_LOG_TRACE, "NSV NSVs vsize %dx%d\n", vwidth, vheight);
401 
402  /* XXX change to ap != NULL ? */
403  if (s->nb_streams == 0) { /* streams not yet published, let's do that */
404  nsv->vtag = vtag;
405  nsv->atag = atag;
406  nsv->vwidth = vwidth;
407  nsv->vheight = vwidth;
408  if (vtag != T_NONE) {
409  int i;
410  st = avformat_new_stream(s, NULL);
411  if (!st)
412  goto fail;
413 
414  st->id = NSV_ST_VIDEO;
415  nst = av_mallocz(sizeof(NSVStream));
416  if (!nst)
417  goto fail;
418  st->priv_data = nst;
420  st->codecpar->codec_tag = vtag;
421  st->codecpar->codec_id = ff_codec_get_id(nsv_codec_video_tags, vtag);
422  st->codecpar->width = vwidth;
423  st->codecpar->height = vheight;
424  st->codecpar->bits_per_coded_sample = 24; /* depth XXX */
425 
426  avpriv_set_pts_info(st, 64, framerate.den, framerate.num);
427  st->start_time = 0;
428  st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
429 
430  for(i=0;i<nsv->index_entries;i++) {
431  if(nsv->nsvs_timestamps) {
433  0, 0, AVINDEX_KEYFRAME);
434  } else {
435  int64_t ts = av_rescale(i*nsv->duration/nsv->index_entries, framerate.num, 1000*framerate.den);
436  av_add_index_entry(st, nsv->nsvs_file_offset[i], ts, 0, 0, AVINDEX_KEYFRAME);
437  }
438  }
439  }
440  if (atag != T_NONE) {
441  st = avformat_new_stream(s, NULL);
442  if (!st)
443  goto fail;
444 
445  st->id = NSV_ST_AUDIO;
446  nst = av_mallocz(sizeof(NSVStream));
447  if (!nst)
448  goto fail;
449  st->priv_data = nst;
451  st->codecpar->codec_tag = atag;
452  st->codecpar->codec_id = ff_codec_get_id(nsv_codec_audio_tags, atag);
453 
454  st->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */
455 
456  /* set timebase to common denominator of ms and framerate */
457  avpriv_set_pts_info(st, 64, 1, framerate.num*1000);
458  st->start_time = 0;
459  st->duration = (int64_t)nsv->duration * framerate.num;
460  }
461  } else {
462  if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
463  av_log(s, AV_LOG_TRACE, "NSV NSVs header values differ from the first one!!!\n");
464  //return -1;
465  }
466  }
467 
468  nsv->state = NSV_HAS_READ_NSVS;
469  return 0;
470 fail:
471  /* XXX */
472  nsv->state = NSV_UNSYNC;
473  return -1;
474 }
475 
477 {
478  NSVContext *nsv = s->priv_data;
479  int i, err;
480 
481  nsv->state = NSV_UNSYNC;
482  nsv->ahead[0].data = nsv->ahead[1].data = NULL;
483 
484  for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
485  if (nsv_resync(s) < 0)
486  return -1;
487  if (nsv->state == NSV_FOUND_NSVF) {
488  err = nsv_parse_NSVf_header(s);
489  if (err < 0)
490  return err;
491  }
492  /* we need the first NSVs also... */
493  if (nsv->state == NSV_FOUND_NSVS) {
494  err = nsv_parse_NSVs_header(s);
495  if (err < 0)
496  return err;
497  break; /* we just want the first one */
498  }
499  }
500  if (s->nb_streams < 1) /* no luck so far */
501  return -1;
502  /* now read the first chunk, so we can attempt to decode more info */
503  err = nsv_read_chunk(s, 1);
504 
505  av_log(s, AV_LOG_TRACE, "parsed header\n");
506  return err;
507 }
508 
509 static int nsv_read_chunk(AVFormatContext *s, int fill_header)
510 {
511  NSVContext *nsv = s->priv_data;
512  AVIOContext *pb = s->pb;
513  AVStream *st[2] = {NULL, NULL};
514  NSVStream *nst;
515  AVPacket *pkt;
516  int i, err = 0;
517  uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
518  uint32_t vsize;
519  uint16_t asize;
520  uint16_t auxsize;
521  int ret;
522 
523  if (nsv->ahead[0].data || nsv->ahead[1].data)
524  return 0; //-1; /* hey! eat what you've in your plate first! */
525 
526 null_chunk_retry:
527  if (avio_feof(pb))
528  return -1;
529 
530  for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
531  err = nsv_resync(s);
532  if (err < 0)
533  return err;
534  if (nsv->state == NSV_FOUND_NSVS)
535  err = nsv_parse_NSVs_header(s);
536  if (err < 0)
537  return err;
538  if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
539  return -1;
540 
541  auxcount = avio_r8(pb);
542  vsize = avio_rl16(pb);
543  asize = avio_rl16(pb);
544  vsize = (vsize << 4) | (auxcount >> 4);
545  auxcount &= 0x0f;
546  av_log(s, AV_LOG_TRACE, "NSV CHUNK %d aux, %"PRIu32" bytes video, %d bytes audio\n", auxcount, vsize, asize);
547  /* skip aux stuff */
548  for (i = 0; i < auxcount; i++) {
549  uint32_t av_unused auxtag;
550  auxsize = avio_rl16(pb);
551  auxtag = avio_rl32(pb);
552  avio_skip(pb, auxsize);
553  vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming brain-dead */
554  }
555 
556  if (avio_feof(pb))
557  return -1;
558  if (!vsize && !asize) {
559  nsv->state = NSV_UNSYNC;
560  goto null_chunk_retry;
561  }
562 
563  /* map back streams to v,a */
564  if (s->nb_streams > 0)
565  st[s->streams[0]->id] = s->streams[0];
566  if (s->nb_streams > 1)
567  st[s->streams[1]->id] = s->streams[1];
568 
569  if (vsize && st[NSV_ST_VIDEO]) {
570  nst = st[NSV_ST_VIDEO]->priv_data;
571  pkt = &nsv->ahead[NSV_ST_VIDEO];
572  if ((ret = av_get_packet(pb, pkt, vsize)) < 0)
573  return ret;
574  pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
575  pkt->dts = nst->frame_offset;
576  pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
577  for (i = 0; i < FFMIN(8, vsize); i++)
578  av_log(s, AV_LOG_TRACE, "NSV video: [%d] = %02x\n", i, pkt->data[i]);
579  }
580  if(st[NSV_ST_VIDEO])
581  ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++;
582 
583  if (asize && st[NSV_ST_AUDIO]) {
584  nst = st[NSV_ST_AUDIO]->priv_data;
585  pkt = &nsv->ahead[NSV_ST_AUDIO];
586  /* read raw audio specific header on the first audio chunk... */
587  /* on ALL audio chunks ?? seems so! */
588  if (asize && st[NSV_ST_AUDIO]->codecpar->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
589  uint8_t bps;
590  uint8_t channels;
591  uint16_t samplerate;
592  bps = avio_r8(pb);
593  channels = avio_r8(pb);
594  samplerate = avio_rl16(pb);
595  if (!channels || !samplerate)
596  return AVERROR_INVALIDDATA;
597  asize-=4;
598  av_log(s, AV_LOG_TRACE, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
599  if (fill_header) {
600  st[NSV_ST_AUDIO]->need_parsing = AVSTREAM_PARSE_NONE; /* we know everything */
601  if (bps != 16) {
602  av_log(s, AV_LOG_TRACE, "NSV AUDIO bit/sample != 16 (%d)!!!\n", bps);
603  }
604  bps /= channels; // ???
605  if (bps == 8)
607  samplerate /= 4;/* UGH ??? XXX */
608  channels = 1;
609  st[NSV_ST_AUDIO]->codecpar->channels = channels;
610  st[NSV_ST_AUDIO]->codecpar->sample_rate = samplerate;
611  av_log(s, AV_LOG_TRACE, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
612  }
613  }
614  if ((ret = av_get_packet(pb, pkt, asize)) < 0)
615  return ret;
616  pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
617  pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
618  if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) {
619  /* on a nsvs frame we have new information on a/v sync */
620  pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1);
621  pkt->dts *= (int64_t)1000 * nsv->framerate.den;
622  pkt->dts += (int64_t)nsv->avsync * nsv->framerate.num;
623  av_log(s, AV_LOG_TRACE, "NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts);
624  }
625  nst->frame_offset++;
626  }
627 
628  nsv->state = NSV_UNSYNC;
629  return 0;
630 }
631 
632 
634 {
635  NSVContext *nsv = s->priv_data;
636  int i, err = 0;
637 
638  /* in case we don't already have something to eat ... */
639  if (!nsv->ahead[0].data && !nsv->ahead[1].data)
640  err = nsv_read_chunk(s, 0);
641  if (err < 0)
642  return err;
643 
644  /* now pick one of the plates */
645  for (i = 0; i < 2; i++) {
646  if (nsv->ahead[i].data) {
647  /* avoid the cost of new_packet + memcpy(->data) */
648  memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket));
649  nsv->ahead[i].data = NULL; /* we ate that one */
650  return pkt->size;
651  }
652  }
653 
654  /* this restaurant is not provisioned :^] */
655  return -1;
656 }
657 
658 static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
659 {
660  NSVContext *nsv = s->priv_data;
661  AVStream *st = s->streams[stream_index];
662  NSVStream *nst = st->priv_data;
663  int index;
664 
665  index = av_index_search_timestamp(st, timestamp, flags);
666  if(index < 0)
667  return -1;
668 
669  if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
670  return -1;
671 
673  nsv->state = NSV_UNSYNC;
674  return 0;
675 }
676 
678 {
679  NSVContext *nsv = s->priv_data;
680 
681  av_freep(&nsv->nsvs_file_offset);
682  av_freep(&nsv->nsvs_timestamps);
683  if (nsv->ahead[0].data)
684  av_packet_unref(&nsv->ahead[0]);
685  if (nsv->ahead[1].data)
686  av_packet_unref(&nsv->ahead[1]);
687  return 0;
688 }
689 
690 static int nsv_probe(AVProbeData *p)
691 {
692  int i, score = 0;
693 
694  /* check file header */
695  /* streamed files might not have any header */
696  if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
697  p->buf[2] == 'V' && (p->buf[3] == 'f' || p->buf[3] == 's'))
698  return AVPROBE_SCORE_MAX;
699  /* XXX: do streamed files always start at chunk boundary ?? */
700  /* or do we need to search NSVs in the byte stream ? */
701  /* seems the servers don't bother starting clean chunks... */
702  /* sometimes even the first header is at 9KB or something :^) */
703  for (i = 1; i < p->buf_size - 3; i++) {
704  if (AV_RL32(p->buf + i) == AV_RL32("NSVs")) {
705  /* Get the chunk size and check if at the end we are getting 0xBEEF */
706  int vsize = AV_RL24(p->buf+i+19) >> 4;
707  int asize = AV_RL16(p->buf+i+22);
708  int offset = i + 23 + asize + vsize + 1;
709  if (offset <= p->buf_size - 2 && AV_RL16(p->buf + offset) == 0xBEEF)
710  return 4*AVPROBE_SCORE_MAX/5;
711  score = AVPROBE_SCORE_MAX/5;
712  }
713  }
714  /* so we'll have more luck on extension... */
715  if (av_match_ext(p->filename, "nsv"))
717  /* FIXME: add mime-type check */
718  return score;
719 }
720 
722  .name = "nsv",
723  .long_name = NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"),
724  .priv_data_size = sizeof(NSVContext),
730 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
Bytestream IO Context.
Definition: avio.h:155
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Add an index entry into a sorted list.
Definition: utils.c:1980
static const AVCodecTag nsv_codec_video_tags[]
Definition: nsvdec.c:181
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3050
static int nsv_parse_NSVf_header(AVFormatContext *s)
Definition: nsvdec.c:256
uint32_t * nsvs_file_offset
Definition: nsvdec.c:168
uint16_t vheight
Definition: nsvdec.c:175
const char * filename
Definition: avformat.h:462
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4739
uint32_t * nsvs_timestamps
Definition: nsvdec.c:178
int64_t pos
Definition: avformat.h:820
#define TB_NSVF
Definition: nsvdec.c:134
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:4128
int rate
Definition: nsvdec.c:157
int num
Numerator.
Definition: rational.h:59
int index
stream index in AVFormatContext
Definition: avformat.h:890
int size
Definition: avcodec.h:1671
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:235
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1092
void * priv_data
Definition: avformat.h:904
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:318
int sample_size
Definition: nsvdec.c:158
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:222
static AVPacket pkt
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:87
#define NSV_MAX_RESYNC
Definition: nsvdec.c:34
static const AVCodecTag nsv_codec_audio_tags[]
Definition: nsvdec.c:201
Macro definitions for various function/variable attributes.
int base_offset
Definition: nsvdec.c:166
Format I/O context.
Definition: avformat.h:1349
Public dictionary API.
#define NSV_MAX_RESYNC_TRIES
Definition: nsvdec.c:35
#define NSV_ST_AUDIO
Definition: nsvdec.c:139
uint8_t
int width
Video only.
Definition: avcodec.h:4194
#define AV_LOG_TRACE
Extremely verbose debugging, useful for libav* development.
Definition: log.h:202
enum AVStreamParseType need_parsing
Definition: avformat.h:1081
int id
Format-specific stream ID.
Definition: avformat.h:896
int frame_offset
Definition: nsvdec.c:154
int NSVf_end
Definition: nsvdec.c:167
int start
Definition: nsvdec.c:159
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4369
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1417
int64_t duration
Definition: movenc.c:63
int new_frame_offset
Definition: nsvdec.c:161
uint8_t * data
Definition: avcodec.h:1670
static int flags
Definition: log.c:57
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:289
static int nsv_resync(AVFormatContext *s)
Definition: nsvdec.c:215
int av_match_ext(const char *filename, const char *extensions)
Return a positive value if the given filename has one of the given extensions, 0 otherwise.
Definition: format.c:85
ptrdiff_t size
Definition: opengl_enc.c:101
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:527
static int nsv_read_close(AVFormatContext *s)
Definition: nsvdec.c:677
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:621
#define NSV_ST_VIDEO
Definition: nsvdec.c:138
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1702
static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: nsvdec.c:633
int64_t duration
Definition: nsvdec.c:173
#define AVINDEX_KEYFRAME
Definition: avformat.h:827
AVPacket ahead[2]
Definition: nsvdec.c:171
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1567
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2089
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:743
#define AVERROR(e)
Definition: error.h:43
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:821
uint16_t vwidth
Definition: nsvdec.c:175
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:179
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:556
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:4124
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_RL24
Definition: bytestream.h:87
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
AVRational framerate
Definition: nsvdec.c:177
#define fail()
Definition: checkasm.h:95
static int nsv_read_chunk(AVFormatContext *s, int fill_header)
Definition: nsvdec.c:509
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1676
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:612
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:464
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:463
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1405
AVInputFormat ff_nsv_demuxer
Definition: nsvdec.c:721
static int nsv_parse_NSVs_header(AVFormatContext *s)
Definition: nsvdec.c:362
int scale
Definition: nsvdec.c:156
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
Definition: mathematics.c:129
static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: nsvdec.c:658
#define FFMIN(a, b)
Definition: common.h:96
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:109
NSVStatus
Definition: nsvdec.c:142
uint32_t vtag
Definition: nsvdec.c:174
static int nsv_probe(AVProbeData *p)
Definition: nsvdec.c:690
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:510
Stream structure.
Definition: avformat.h:889
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
sample_rate
AVIOContext * pb
I/O context.
Definition: avformat.h:1391
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:617
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:70
#define T_NONE
Definition: nsvdec.c:129
int index
Definition: gxfenc.c:89
Rational number (pair of numerator and denominator).
Definition: rational.h:58
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:471
This structure contains the data a format has to probe a file.
Definition: avformat.h:461
static int nsv_read_header(AVFormatContext *s)
Definition: nsvdec.c:476
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:946
int sample_rate
Audio only.
Definition: avcodec.h:4238
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:473
full parsing and repack
Definition: avformat.h:810
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:727
Main libavformat public API header.
int cum_len
Definition: nsvdec.c:162
enum NSVStatus state
Definition: nsvdec.c:170
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:936
uint32_t atag
Definition: nsvdec.c:174
int den
Denominator.
Definition: rational.h:60
unsigned bps
Definition: movenc.c:1457
#define MKBETAG(a, b, c, d)
Definition: common.h:343
#define av_free(p)
int index_entries
Definition: nsvdec.c:169
void * priv_data
Format private data.
Definition: avformat.h:1377
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:4170
int channels
Audio only.
Definition: avcodec.h:4234
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1669
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:664
AVCodecParameters * codecpar
Definition: avformat.h:1252
#define av_malloc_array(a, b)
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:345
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:4132
int16_t avsync
Definition: nsvdec.c:176
int stream_index
Definition: avcodec.h:1672
#define MKTAG(a, b, c, d)
Definition: common.h:342
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1647
#define av_unused
Definition: attributes.h:125