FFmpeg  4.4.5
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;
170  enum NSVStatus state;
171  AVPacket ahead[2]; /* [v, a] if .data is !NULL there is something */
172  /* cached */
174  uint32_t vtag, atag;
175  uint16_t vwidth, vheight;
176  int16_t avsync;
178  uint32_t *nsvs_timestamps;
179  int nsvf;
180 } NSVContext;
181 
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 
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 static int nsv_read_close(AVFormatContext *s);
215 
216 /* try to find something we recognize, and set the state accordingly */
218 {
219  NSVContext *nsv = s->priv_data;
220  AVIOContext *pb = s->pb;
221  uint32_t v = 0;
222  int i;
223 
224  for (i = 0; i < NSV_MAX_RESYNC; i++) {
225  if (avio_feof(pb)) {
226  av_log(s, AV_LOG_TRACE, "NSV EOF\n");
227  nsv->state = NSV_UNSYNC;
228  return -1;
229  }
230  v <<= 8;
231  v |= avio_r8(pb);
232  if (i < 8) {
233  av_log(s, AV_LOG_TRACE, "NSV resync: [%d] = %02"PRIx32"\n", i, v & 0x0FF);
234  }
235 
236  if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
237  av_log(s, AV_LOG_TRACE, "NSV resynced on BEEF after %d bytes\n", i+1);
238  nsv->state = NSV_FOUND_BEEF;
239  return 0;
240  }
241  /* we read as big-endian, thus the MK*BE* */
242  if (v == TB_NSVF) { /* NSVf */
243  av_log(s, AV_LOG_TRACE, "NSV resynced on NSVf after %d bytes\n", i+1);
244  nsv->state = NSV_FOUND_NSVF;
245  return 0;
246  }
247  if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
248  av_log(s, AV_LOG_TRACE, "NSV resynced on NSVs after %d bytes\n", i+1);
249  nsv->state = NSV_FOUND_NSVS;
250  return 0;
251  }
252 
253  }
254  av_log(s, AV_LOG_TRACE, "NSV sync lost\n");
255  return -1;
256 }
257 
259 {
260  NSVContext *nsv = s->priv_data;
261  AVIOContext *pb = s->pb;
262  unsigned int av_unused file_size;
263  unsigned int size;
265  int strings_size;
266  int table_entries;
267  int table_entries_used;
268 
269  nsv->state = NSV_UNSYNC; /* in case we fail */
270 
271  if (nsv->nsvf) {
272  av_log(s, AV_LOG_TRACE, "Multiple NSVf\n");
273  return 0;
274  }
275  nsv->nsvf = 1;
276 
277  size = avio_rl32(pb);
278  if (size < 28)
279  return -1;
280  nsv->NSVf_end = size;
281 
282  file_size = (uint32_t)avio_rl32(pb);
283  av_log(s, AV_LOG_TRACE, "NSV NSVf chunk_size %u\n", size);
284  av_log(s, AV_LOG_TRACE, "NSV NSVf file_size %u\n", file_size);
285 
286  nsv->duration = duration = avio_rl32(pb); /* in ms */
287  av_log(s, AV_LOG_TRACE, "NSV NSVf duration %"PRId64" ms\n", duration);
288  // XXX: store it in AVStreams
289 
290  strings_size = avio_rl32(pb);
291  table_entries = avio_rl32(pb);
292  table_entries_used = avio_rl32(pb);
293  av_log(s, AV_LOG_TRACE, "NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
294  strings_size, table_entries, table_entries_used);
295  if (avio_feof(pb))
296  return -1;
297 
298  av_log(s, AV_LOG_TRACE, "NSV got header; filepos %"PRId64"\n", avio_tell(pb));
299 
300  if (strings_size > 0) {
301  char *strings; /* last byte will be '\0' to play safe with str*() */
302  char *p, *endp;
303  char *token, *value;
304  char quote;
305 
306  p = strings = av_mallocz((size_t)strings_size + 1);
307  if (!p)
308  return AVERROR(ENOMEM);
309  endp = strings + strings_size;
310  avio_read(pb, strings, strings_size);
311  while (p < endp) {
312  while (*p == ' ')
313  p++; /* strip out spaces */
314  if (p >= endp-2)
315  break;
316  token = p;
317  p = strchr(p, '=');
318  if (!p || p >= endp-2)
319  break;
320  *p++ = '\0';
321  quote = *p++;
322  value = p;
323  p = strchr(p, quote);
324  if (!p || p >= endp)
325  break;
326  *p++ = '\0';
327  av_log(s, AV_LOG_TRACE, "NSV NSVf INFO: %s='%s'\n", token, value);
328  av_dict_set(&s->metadata, token, value, 0);
329  }
330  av_free(strings);
331  }
332  if (avio_feof(pb))
333  return -1;
334 
335  av_log(s, AV_LOG_TRACE, "NSV got infos; filepos %"PRId64"\n", avio_tell(pb));
336 
337  if (table_entries_used > 0) {
338  int i;
339  nsv->index_entries = table_entries_used;
340  if((unsigned)table_entries_used >= UINT_MAX / sizeof(uint32_t))
341  return -1;
342  nsv->nsvs_file_offset = av_malloc_array((unsigned)table_entries_used, sizeof(uint32_t));
343  if (!nsv->nsvs_file_offset)
344  return AVERROR(ENOMEM);
345 
346  for(i=0;i<table_entries_used;i++) {
347  if (avio_feof(pb))
348  return AVERROR_INVALIDDATA;
349  nsv->nsvs_file_offset[i] = avio_rl32(pb) + size;
350  }
351 
352  if(table_entries > table_entries_used &&
353  avio_rl32(pb) == MKTAG('T','O','C','2')) {
354  nsv->nsvs_timestamps = av_malloc_array((unsigned)table_entries_used, sizeof(uint32_t));
355  if (!nsv->nsvs_timestamps)
356  return AVERROR(ENOMEM);
357  for(i=0;i<table_entries_used;i++) {
358  nsv->nsvs_timestamps[i] = avio_rl32(pb);
359  }
360  }
361  }
362 
363  av_log(s, AV_LOG_TRACE, "NSV got index; filepos %"PRId64"\n", avio_tell(pb));
364 
365  avio_seek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
366 
367  if (avio_feof(pb))
368  return -1;
369  nsv->state = NSV_HAS_READ_NSVF;
370  return 0;
371 }
372 
374 {
375  NSVContext *nsv = s->priv_data;
376  AVIOContext *pb = s->pb;
377  uint32_t vtag, atag;
378  uint16_t vwidth, vheight;
380  int i;
381  AVStream *st;
382  NSVStream *nst;
383 
384  vtag = avio_rl32(pb);
385  atag = avio_rl32(pb);
386  vwidth = avio_rl16(pb);
387  vheight = avio_rl16(pb);
388  i = avio_r8(pb);
389 
390  av_log(s, AV_LOG_TRACE, "NSV NSVs framerate code %2x\n", i);
391  if(i&0x80) { /* odd way of giving native framerates from docs */
392  int t=(i & 0x7F)>>2;
393  if(t<16) framerate = (AVRational){1, t+1};
394  else framerate = (AVRational){t-15, 1};
395 
396  if(i&1){
397  framerate.num *= 1000;
398  framerate.den *= 1001;
399  }
400 
401  if((i&3)==3) framerate.num *= 24;
402  else if((i&3)==2) framerate.num *= 25;
403  else framerate.num *= 30;
404  }
405  else
406  framerate= (AVRational){i, 1};
407 
408  nsv->avsync = avio_rl16(pb);
409  nsv->framerate = framerate;
410 
411  av_log(s, AV_LOG_TRACE, "NSV NSVs vsize %dx%d\n", vwidth, vheight);
412 
413  /* XXX change to ap != NULL ? */
414  if (s->nb_streams == 0) { /* streams not yet published, let's do that */
415  nsv->vtag = vtag;
416  nsv->atag = atag;
417  nsv->vwidth = vwidth;
418  nsv->vheight = vwidth;
419  if (vtag != T_NONE) {
420  int i;
421  st = avformat_new_stream(s, NULL);
422  if (!st)
423  goto fail;
424 
425  st->id = NSV_ST_VIDEO;
426  nst = av_mallocz(sizeof(NSVStream));
427  if (!nst)
428  goto fail;
429  st->priv_data = nst;
431  st->codecpar->codec_tag = vtag;
433  st->codecpar->width = vwidth;
434  st->codecpar->height = vheight;
435  st->codecpar->bits_per_coded_sample = 24; /* depth XXX */
436 
437  avpriv_set_pts_info(st, 64, framerate.den, framerate.num);
438  st->start_time = 0;
439  st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
440 
441  for(i=0;i<nsv->index_entries;i++) {
442  if(nsv->nsvs_timestamps) {
444  0, 0, AVINDEX_KEYFRAME);
445  } else {
446  int64_t ts = av_rescale(i*nsv->duration/nsv->index_entries, framerate.num, 1000*framerate.den);
448  }
449  }
450  }
451  if (atag != T_NONE) {
452  st = avformat_new_stream(s, NULL);
453  if (!st)
454  goto fail;
455 
456  st->id = NSV_ST_AUDIO;
457  nst = av_mallocz(sizeof(NSVStream));
458  if (!nst)
459  goto fail;
460  st->priv_data = nst;
462  st->codecpar->codec_tag = atag;
464 
465  st->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */
466 
467  /* set timebase to common denominator of ms and framerate */
468  avpriv_set_pts_info(st, 64, 1, framerate.num*1000);
469  st->start_time = 0;
470  st->duration = (int64_t)nsv->duration * framerate.num;
471  }
472  } else {
473  if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
474  av_log(s, AV_LOG_TRACE, "NSV NSVs header values differ from the first one!!!\n");
475  //return -1;
476  }
477  }
478 
479  nsv->state = NSV_HAS_READ_NSVS;
480  return 0;
481 fail:
482  /* XXX */
483  nsv->state = NSV_UNSYNC;
484  return -1;
485 }
486 
488 {
489  NSVContext *nsv = s->priv_data;
490  int i, err;
491 
492  nsv->state = NSV_UNSYNC;
493  nsv->ahead[0].data = nsv->ahead[1].data = NULL;
494 
495  for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
496  err = nsv_resync(s);
497  if (err < 0)
498  goto fail;
499  if (nsv->state == NSV_FOUND_NSVF) {
500  err = nsv_parse_NSVf_header(s);
501  if (err < 0)
502  goto fail;
503  }
504  /* we need the first NSVs also... */
505  if (nsv->state == NSV_FOUND_NSVS) {
506  err = nsv_parse_NSVs_header(s);
507  if (err < 0)
508  goto fail;
509  break; /* we just want the first one */
510  }
511  }
512  if (s->nb_streams < 1) { /* no luck so far */
513  err = AVERROR_INVALIDDATA;
514  goto fail;
515  }
516 
517  /* now read the first chunk, so we can attempt to decode more info */
518  err = nsv_read_chunk(s, 1);
519 fail:
520  if (err < 0)
521  nsv_read_close(s);
522 
523  av_log(s, AV_LOG_TRACE, "parsed header\n");
524  return err;
525 }
526 
527 static int nsv_read_chunk(AVFormatContext *s, int fill_header)
528 {
529  NSVContext *nsv = s->priv_data;
530  AVIOContext *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  int ret;
540 
541  if (nsv->ahead[0].data || nsv->ahead[1].data)
542  return 0; //-1; /* hey! eat what you've in your plate first! */
543 
544 null_chunk_retry:
545  if (avio_feof(pb))
546  return -1;
547 
548  for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
549  err = nsv_resync(s);
550  if (err < 0)
551  return err;
552  if (nsv->state == NSV_FOUND_NSVS)
553  err = nsv_parse_NSVs_header(s);
554  if (err < 0)
555  return err;
556  if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
557  return -1;
558 
559  auxcount = avio_r8(pb);
560  vsize = avio_rl16(pb);
561  asize = avio_rl16(pb);
562  vsize = (vsize << 4) | (auxcount >> 4);
563  auxcount &= 0x0f;
564  av_log(s, AV_LOG_TRACE, "NSV CHUNK %d aux, %"PRIu32" bytes video, %d bytes audio\n", auxcount, vsize, asize);
565  /* skip aux stuff */
566  for (i = 0; i < auxcount; i++) {
567  uint32_t av_unused auxtag;
568  auxsize = avio_rl16(pb);
569  auxtag = avio_rl32(pb);
570  avio_skip(pb, auxsize);
571  vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming brain-dead */
572  }
573 
574  if (avio_feof(pb))
575  return -1;
576  if (!vsize && !asize) {
577  nsv->state = NSV_UNSYNC;
578  goto null_chunk_retry;
579  }
580 
581  /* map back streams to v,a */
582  if (s->nb_streams > 0)
583  st[s->streams[0]->id] = s->streams[0];
584  if (s->nb_streams > 1)
585  st[s->streams[1]->id] = s->streams[1];
586 
587  if (vsize && st[NSV_ST_VIDEO]) {
588  nst = st[NSV_ST_VIDEO]->priv_data;
589  pkt = &nsv->ahead[NSV_ST_VIDEO];
590  if ((ret = av_get_packet(pb, pkt, vsize)) < 0)
591  return ret;
592  pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
593  pkt->dts = nst->frame_offset;
594  pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
595  for (i = 0; i < FFMIN(8, vsize); i++)
596  av_log(s, AV_LOG_TRACE, "NSV video: [%d] = %02x\n", i, pkt->data[i]);
597  }
598  if(st[NSV_ST_VIDEO])
599  ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++;
600 
601  if (asize && st[NSV_ST_AUDIO]) {
602  nst = st[NSV_ST_AUDIO]->priv_data;
603  pkt = &nsv->ahead[NSV_ST_AUDIO];
604  /* read raw audio specific header on the first audio chunk... */
605  /* on ALL audio chunks ?? seems so! */
606  if (asize >= 4 && st[NSV_ST_AUDIO]->codecpar->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
607  uint8_t bps;
609  uint16_t samplerate;
610  bps = avio_r8(pb);
611  channels = avio_r8(pb);
612  samplerate = avio_rl16(pb);
613  if (!channels || !samplerate)
614  return AVERROR_INVALIDDATA;
615  asize-=4;
616  av_log(s, AV_LOG_TRACE, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
617  if (fill_header) {
618  st[NSV_ST_AUDIO]->need_parsing = AVSTREAM_PARSE_NONE; /* we know everything */
619  if (bps != 16) {
620  av_log(s, AV_LOG_TRACE, "NSV AUDIO bit/sample != 16 (%d)!!!\n", bps);
621  }
622  bps /= channels; // ???
623  if (bps == 8)
625  samplerate /= 4;/* UGH ??? XXX */
626  channels = 1;
628  st[NSV_ST_AUDIO]->codecpar->sample_rate = samplerate;
629  av_log(s, AV_LOG_TRACE, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
630  }
631  }
632  if ((ret = av_get_packet(pb, pkt, asize)) < 0)
633  return ret;
634  pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
635  pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
636  if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) {
637  /* on a nsvs frame we have new information on a/v sync */
638  pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1);
639  pkt->dts *= (int64_t)1000 * nsv->framerate.den;
640  pkt->dts += (int64_t)nsv->avsync * nsv->framerate.num;
641  av_log(s, AV_LOG_TRACE, "NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts);
642  }
643  nst->frame_offset++;
644  }
645 
646  nsv->state = NSV_UNSYNC;
647  return 0;
648 }
649 
650 
652 {
653  NSVContext *nsv = s->priv_data;
654  int i, err = 0;
655 
656  /* in case we don't already have something to eat ... */
657  if (!nsv->ahead[0].data && !nsv->ahead[1].data)
658  err = nsv_read_chunk(s, 0);
659  if (err < 0)
660  return err;
661 
662  /* now pick one of the plates */
663  for (i = 0; i < 2; i++) {
664  if (nsv->ahead[i].data) {
665  av_packet_move_ref(pkt, &nsv->ahead[i]);
666  return 0;
667  }
668  }
669 
670  /* this restaurant is not provisioned :^] */
671  return -1;
672 }
673 
674 static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
675 {
676  NSVContext *nsv = s->priv_data;
677  AVStream *st = s->streams[stream_index];
678  NSVStream *nst = st->priv_data;
679  int index;
680 
681  index = av_index_search_timestamp(st, timestamp, flags);
682  if(index < 0)
683  return -1;
684 
685  if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
686  return -1;
687 
689  nsv->state = NSV_UNSYNC;
690  return 0;
691 }
692 
694 {
695  NSVContext *nsv = s->priv_data;
696 
697  av_freep(&nsv->nsvs_file_offset);
698  av_freep(&nsv->nsvs_timestamps);
699  if (nsv->ahead[0].data)
700  av_packet_unref(&nsv->ahead[0]);
701  if (nsv->ahead[1].data)
702  av_packet_unref(&nsv->ahead[1]);
703  return 0;
704 }
705 
706 static int nsv_probe(const AVProbeData *p)
707 {
708  int i, score = 0;
709 
710  /* check file header */
711  /* streamed files might not have any header */
712  if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
713  p->buf[2] == 'V' && (p->buf[3] == 'f' || p->buf[3] == 's'))
714  return AVPROBE_SCORE_MAX;
715  /* XXX: do streamed files always start at chunk boundary ?? */
716  /* or do we need to search NSVs in the byte stream ? */
717  /* seems the servers don't bother starting clean chunks... */
718  /* sometimes even the first header is at 9KB or something :^) */
719  for (i = 1; i < p->buf_size - 3; i++) {
720  if (AV_RL32(p->buf + i) == AV_RL32("NSVs")) {
721  /* Get the chunk size and check if at the end we are getting 0xBEEF */
722  int vsize = AV_RL24(p->buf+i+19) >> 4;
723  int asize = AV_RL16(p->buf+i+22);
724  int offset = i + 23 + asize + vsize + 1;
725  if (offset <= p->buf_size - 2 && AV_RL16(p->buf + offset) == 0xBEEF)
726  return 4*AVPROBE_SCORE_MAX/5;
727  score = AVPROBE_SCORE_MAX/5;
728  }
729  }
730  /* so we'll have more luck on extension... */
731  if (av_match_ext(p->filename, "nsv"))
733  /* FIXME: add mime-type check */
734  return score;
735 }
736 
738  .name = "nsv",
739  .long_name = NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"),
740  .priv_data_size = sizeof(NSVContext),
746 };
channels
Definition: aptx.h:33
Macro definitions for various function/variable attributes.
#define av_unused
Definition: attributes.h:131
uint8_t
Main libavformat public API header.
#define AVINDEX_KEYFRAME
Definition: avformat.h:811
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:451
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:310
@ AVSTREAM_PARSE_FULL
full parsing and repack
Definition: avformat.h:794
@ AVSTREAM_PARSE_NONE
Definition: avformat.h:793
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:364
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:734
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:633
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:750
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:624
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
#define AV_RL16
Definition: intreadwrite.h:42
#define AV_RL24
Definition: intreadwrite.h:78
#define AV_RL32
Definition: intreadwrite.h:146
#define flags(name, subs,...)
Definition: cbs_av1.c:572
#define s(width, name)
Definition: cbs_vp9.c:257
#define fail()
Definition: checkasm.h:133
#define FFMIN(a, b)
Definition: common.h:105
#define MKTAG(a, b, c, d)
Definition: common.h:478
#define MKBETAG(a, b, c, d)
Definition: common.h:479
#define NULL
Definition: coverity.c:32
long long int64_t
Definition: coverity.c:34
Public dictionary API.
double value
Definition: eval.c:98
sample_rate
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:545
@ AV_CODEC_ID_VP6
Definition: codec_id.h:140
@ AV_CODEC_ID_VP3
Definition: codec_id.h:78
@ AV_CODEC_ID_RAWVIDEO
Definition: codec_id.h:62
@ AV_CODEC_ID_PCM_U8
Definition: codec_id.h:318
@ AV_CODEC_ID_NONE
Definition: codec_id.h:47
@ AV_CODEC_ID_VP8
Definition: codec_id.h:189
@ AV_CODEC_ID_AAC
Definition: codec_id.h:426
@ AV_CODEC_ID_VP5
Definition: codec_id.h:139
@ AV_CODEC_ID_MPEG4
Definition: codec_id.h:61
@ AV_CODEC_ID_SPEEX
Definition: codec_id.h:459
@ AV_CODEC_ID_MP3
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: codec_id.h:425
@ AV_CODEC_ID_PCM_U16LE
Definition: codec_id.h:315
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:634
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:410
void av_packet_move_ref(AVPacket *dst, AVPacket *src)
Move every field in src to dst and reset src.
Definition: avpacket.c:690
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4509
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:2013
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:38
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2130
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 AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR(e)
Definition: error.h:43
#define AV_LOG_TRACE
Extremely verbose debugging, useful for libav* development.
Definition: log.h:220
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
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:237
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
int index
Definition: gxfenc.c:89
int i
Definition: input.c:407
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:4945
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3131
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
unsigned bps
Definition: movenc.c:1612
#define TB_NSVF
Definition: nsvdec.c:134
#define NSV_ST_AUDIO
Definition: nsvdec.c:139
static int nsv_read_close(AVFormatContext *s)
Definition: nsvdec.c:693
static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: nsvdec.c:651
#define T_NONE
Definition: nsvdec.c:129
#define NSV_MAX_RESYNC_TRIES
Definition: nsvdec.c:35
#define NSV_ST_VIDEO
Definition: nsvdec.c:138
static const AVCodecTag nsv_codec_video_tags[]
Definition: nsvdec.c:182
static int nsv_resync(AVFormatContext *s)
Definition: nsvdec.c:217
static int nsv_read_header(AVFormatContext *s)
Definition: nsvdec.c:487
static int nsv_parse_NSVs_header(AVFormatContext *s)
Definition: nsvdec.c:373
static int nsv_probe(const AVProbeData *p)
Definition: nsvdec.c:706
AVInputFormat ff_nsv_demuxer
Definition: nsvdec.c:737
static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: nsvdec.c:674
static int nsv_read_chunk(AVFormatContext *s, int fill_header)
Definition: nsvdec.c:527
static const AVCodecTag nsv_codec_audio_tags[]
Definition: nsvdec.c:202
#define NSV_MAX_RESYNC
Definition: nsvdec.c:34
static int nsv_parse_NSVf_header(AVFormatContext *s)
Definition: nsvdec.c:258
NSVStatus
Definition: nsvdec.c:142
@ NSV_GOT_AUDIO
Definition: nsvdec.c:150
@ NSV_FOUND_NSVS
Definition: nsvdec.c:146
@ NSV_FOUND_BEEF
Definition: nsvdec.c:148
@ NSV_GOT_VIDEO
Definition: nsvdec.c:149
@ NSV_HAS_READ_NSVS
Definition: nsvdec.c:147
@ NSV_UNSYNC
Definition: nsvdec.c:143
@ NSV_FOUND_NSVF
Definition: nsvdec.c:144
@ NSV_HAS_READ_NSVF
Definition: nsvdec.c:145
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
int channels
Audio only.
Definition: codec_par.h:166
int width
Video only.
Definition: codec_par.h:126
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int sample_rate
Audio only.
Definition: codec_par.h:170
Format I/O context.
Definition: avformat.h:1232
Bytestream IO Context.
Definition: avio.h:161
int64_t pos
Definition: avformat.h:804
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:805
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
This structure stores compressed data.
Definition: packet.h:346
int stream_index
Definition: packet.h:371
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:375
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed.
Definition: packet.h:368
uint8_t * data
Definition: packet.h:369
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
const char * filename
Definition: avformat.h:442
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:444
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int num
Numerator.
Definition: rational.h:59
int den
Denominator.
Definition: rational.h:60
Stream structure.
Definition: avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:922
void * priv_data
Definition: avformat.h:888
int id
Format-specific stream ID.
Definition: avformat.h:880
int index
stream index in AVFormatContext
Definition: avformat.h:874
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
Definition: avformat.h:912
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1090
enum AVStreamParseType need_parsing
Definition: avformat.h:1081
int16_t avsync
Definition: nsvdec.c:176
AVRational framerate
Definition: nsvdec.c:177
uint32_t * nsvs_timestamps
Definition: nsvdec.c:178
int NSVf_end
Definition: nsvdec.c:167
int index_entries
Definition: nsvdec.c:169
enum NSVStatus state
Definition: nsvdec.c:170
uint16_t vwidth
Definition: nsvdec.c:175
int64_t duration
Definition: nsvdec.c:173
AVPacket ahead[2]
Definition: nsvdec.c:171
uint32_t atag
Definition: nsvdec.c:174
uint16_t vheight
Definition: nsvdec.c:175
int base_offset
Definition: nsvdec.c:166
uint32_t vtag
Definition: nsvdec.c:174
uint32_t * nsvs_file_offset
Definition: nsvdec.c:168
int nsvf
Definition: nsvdec.c:179
int rate
Definition: nsvdec.c:157
int new_frame_offset
Definition: nsvdec.c:161
int frame_offset
Definition: nsvdec.c:154
int start
Definition: nsvdec.c:159
int cum_len
Definition: nsvdec.c:162
int scale
Definition: nsvdec.c:156
int sample_size
Definition: nsvdec.c:158
#define av_free(p)
#define av_malloc_array(a, b)
#define av_freep(p)
#define av_log(a,...)
int framerate
Definition: h264_levels.c:65
int64_t duration
Definition: movenc.c:64
AVPacket * pkt
Definition: movenc.c:59
int size
static const uint8_t offset[127][2]
Definition: vf_spp.c:107