Libav
nsvdec.c
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1 /*
2  * NSV demuxer
3  * Copyright (c) 2004 The Libav Project
4  *
5  * first version by Francois Revol <revol@free.fr>
6  *
7  * This file is part of Libav.
8  *
9  * Libav 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  * Libav 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 Libav; 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 
30 /* max bytes to crawl for trying to resync
31  * stupid streaming servers don't start at chunk boundaries...
32  */
33 #define NSV_MAX_RESYNC (500*1024)
34 #define NSV_MAX_RESYNC_TRIES 300
35 
36 /*
37  * References:
38  * (1) http://www.multimedia.cx/nsv-format.txt
39  * seems someone came to the same conclusions as me, and updated it:
40  * (2) http://www.stud.ktu.lt/~vitslav/nsv/nsv-format.txt
41  * http://www.stud.ktu.lt/~vitslav/nsv/
42  * official docs
43  * (3) http://ultravox.aol.com/NSVFormat.rtf
44  * Sample files:
45  * (S1) http://www.nullsoft.com/nsv/samples/
46  * http://www.nullsoft.com/nsv/samples/faster.nsv
47  * http://streamripper.sourceforge.net/openbb/read.php?TID=492&page=4
48  */
49 
50 /*
51  * notes on the header (Francois Revol):
52  *
53  * It is followed by strings, then a table, but nothing tells
54  * where the table begins according to (1). After checking faster.nsv,
55  * I believe NVSf[16-19] gives the size of the strings data
56  * (that is the offset of the data table after the header).
57  * After checking all samples from (S1) all confirms this.
58  *
59  * Then, about NSVf[12-15], faster.nsf has 179700. When viewing it in VLC,
60  * I noticed there was about 1 NVSs chunk/s, so I ran
61  * strings faster.nsv | grep NSVs | wc -l
62  * which gave me 180. That leads me to think that NSVf[12-15] might be the
63  * file length in milliseconds.
64  * Let's try that:
65  * 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
66  * except for nsvtrailer (which doesn't have an NSVf header), it reports correct time.
67  *
68  * nsvtrailer.nsv (S1) does not have any NSVf header, only NSVs chunks,
69  * so the header seems to not be mandatory. (for streaming).
70  *
71  * index slice duration check (excepts nsvtrailer.nsv):
72  * for f in [^n]*.nsv; do
73  * DUR="$(avconv -i "$f" 2> /dev/null | grep 'NSVf duration' | cut -d ' ' -f 4)"
74  * IC="$(avconv -i "$f" 2> /dev/null | grep 'INDEX ENTRIES' | cut -d ' ' -f 2)"
75  * echo "duration $DUR, slite time $(($DUR/$IC))"
76  * done
77  */
78 
79 /*
80  * TODO:
81  * - handle timestamps !!!
82  * - use index
83  * - mime-type in probe()
84  * - seek
85  */
86 
87 #if 0
88 struct NSVf_header {
89  uint32_t chunk_tag; /* 'NSVf' */
90  uint32_t chunk_size;
91  uint32_t file_size; /* max 4GB ??? no one learns anything it seems :^) */
92  uint32_t file_length; //unknown1; /* what about MSB of file_size ? */
93  uint32_t info_strings_size; /* size of the info strings */ //unknown2;
94  uint32_t table_entries;
95  uint32_t table_entries_used; /* the left ones should be -1 */
96 };
97 
98 struct NSVs_header {
99  uint32_t chunk_tag; /* 'NSVs' */
100  uint32_t v4cc; /* or 'NONE' */
101  uint32_t a4cc; /* or 'NONE' */
102  uint16_t vwidth; /* assert(vwidth%16==0) */
103  uint16_t vheight; /* assert(vheight%16==0) */
104  uint8_t framerate; /* value = (framerate&0x80)?frtable[frameratex0x7f]:framerate */
105  uint16_t unknown;
106 };
107 
108 struct nsv_avchunk_header {
109  uint8_t vchunk_size_lsb;
110  uint16_t vchunk_size_msb; /* value = (vchunk_size_msb << 4) | (vchunk_size_lsb >> 4) */
111  uint16_t achunk_size;
112 };
113 
114 struct nsv_pcm_header {
115  uint8_t bits_per_sample;
116  uint8_t channel_count;
117  uint16_t sample_rate;
118 };
119 #endif
120 
121 /* variation from avi.h */
122 /*typedef struct CodecTag {
123  int id;
124  unsigned int tag;
125 } CodecTag;*/
126 
127 /* tags */
128 
129 #define T_NSVF MKTAG('N', 'S', 'V', 'f') /* file header */
130 #define T_NSVS MKTAG('N', 'S', 'V', 's') /* chunk header */
131 #define T_TOC2 MKTAG('T', 'O', 'C', '2') /* extra index marker */
132 #define T_NONE MKTAG('N', 'O', 'N', 'E') /* null a/v 4CC */
133 #define T_SUBT MKTAG('S', 'U', 'B', 'T') /* subtitle aux data */
134 #define T_ASYN MKTAG('A', 'S', 'Y', 'N') /* async a/v aux marker */
135 #define T_KEYF MKTAG('K', 'E', 'Y', 'F') /* video keyframe aux marker (addition) */
136 
137 #define TB_NSVF MKBETAG('N', 'S', 'V', 'f')
138 #define TB_NSVS MKBETAG('N', 'S', 'V', 's')
139 
140 /* hardcoded stream indexes */
141 #define NSV_ST_VIDEO 0
142 #define NSV_ST_AUDIO 1
143 #define NSV_ST_SUBT 2
144 
145 enum NSVStatus {
154 };
155 
156 typedef struct NSVStream {
157  int frame_offset; /* current frame (video) or byte (audio) counter
158  (used to compute the pts) */
159  int scale;
160  int rate;
161  int sample_size; /* audio only data */
162  int start;
163 
164  int new_frame_offset; /* temporary storage (used during seek) */
165  int cum_len; /* temporary storage (used during seek) */
166 } NSVStream;
167 
168 typedef struct NSVContext {
170  int NSVf_end;
171  uint32_t *nsvs_file_offset;
174  AVPacket ahead[2]; /* [v, a] if .data is !NULL there is something */
175  /* cached */
176  int64_t duration;
177  uint32_t vtag, atag;
178  uint16_t vwidth, vheight;
179  int16_t avsync;
181  uint32_t *nsvs_timestamps;
182 } NSVContext;
183 
185  { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
186  { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
187  { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
188  { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') },
189  { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
190  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
191  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
192  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
193  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
194 /*
195  { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
196  { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
197 */
198  { AV_CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
199  { AV_CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
200  { AV_CODEC_ID_NONE, 0 },
201 };
202 
204  { AV_CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') },
205  { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') },
206  { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') },
207  { AV_CODEC_ID_SPEEX, MKTAG('S', 'P', 'X', ' ') },
208  { AV_CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
209  { AV_CODEC_ID_NONE, 0 },
210 };
211 
212 //static int nsv_load_index(AVFormatContext *s);
213 static int nsv_read_chunk(AVFormatContext *s, int fill_header);
214 
215 #define print_tag(str, tag, size) \
216  av_log(NULL, AV_LOG_TRACE, "%s: tag=%c%c%c%c\n", \
217  str, tag & 0xff, \
218  (tag >> 8) & 0xff, \
219  (tag >> 16) & 0xff, \
220  (tag >> 24) & 0xff);
221 
222 /* try to find something we recognize, and set the state accordingly */
224 {
225  NSVContext *nsv = s->priv_data;
226  AVIOContext *pb = s->pb;
227  uint32_t v = 0;
228  int i;
229 
230  av_log(s, AV_LOG_TRACE, "%s(), offset = %"PRId64", state = %d\n", __FUNCTION__, avio_tell(pb), nsv->state);
231 
232  for (i = 0; i < NSV_MAX_RESYNC; i++) {
233  if (pb->eof_reached) {
234  av_log(s, AV_LOG_TRACE, "NSV EOF\n");
235  nsv->state = NSV_UNSYNC;
236  return -1;
237  }
238  v <<= 8;
239  v |= avio_r8(pb);
240  if (i < 8) {
241  av_log(s, AV_LOG_TRACE, "NSV resync: [%d] = %02x\n", i, v & 0x0FF);
242  }
243 
244  if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
245  av_log(s, AV_LOG_TRACE, "NSV resynced on BEEF after %d bytes\n", i+1);
246  nsv->state = NSV_FOUND_BEEF;
247  return 0;
248  }
249  /* we read as big-endian, thus the MK*BE* */
250  if (v == TB_NSVF) { /* NSVf */
251  av_log(s, AV_LOG_TRACE, "NSV resynced on NSVf after %d bytes\n", i+1);
252  nsv->state = NSV_FOUND_NSVF;
253  return 0;
254  }
255  if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
256  av_log(s, AV_LOG_TRACE, "NSV resynced on NSVs after %d bytes\n", i+1);
257  nsv->state = NSV_FOUND_NSVS;
258  return 0;
259  }
260 
261  }
262  av_log(s, AV_LOG_TRACE, "NSV sync lost\n");
263  return -1;
264 }
265 
267 {
268  NSVContext *nsv = s->priv_data;
269  AVIOContext *pb = s->pb;
270  unsigned int av_unused file_size;
271  unsigned int size;
272  int64_t duration;
273  int strings_size;
274  int table_entries;
275  int table_entries_used;
276 
277  av_log(s, AV_LOG_TRACE, "%s()\n", __FUNCTION__);
278 
279  nsv->state = NSV_UNSYNC; /* in case we fail */
280 
281  size = avio_rl32(pb);
282  if (size < 28)
283  return -1;
284  nsv->NSVf_end = size;
285 
286  file_size = (uint32_t)avio_rl32(pb);
287  av_log(s, AV_LOG_TRACE, "NSV NSVf chunk_size %u\n", size);
288  av_log(s, AV_LOG_TRACE, "NSV NSVf file_size %u\n", file_size);
289 
290  nsv->duration = duration = avio_rl32(pb); /* in ms */
291  av_log(s, AV_LOG_TRACE, "NSV NSVf duration %"PRId64" ms\n", duration);
292  // XXX: store it in AVStreams
293 
294  strings_size = avio_rl32(pb);
295  table_entries = avio_rl32(pb);
296  table_entries_used = avio_rl32(pb);
297  av_log(s, AV_LOG_TRACE, "NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
298  strings_size, table_entries, table_entries_used);
299  if (pb->eof_reached)
300  return -1;
301 
302  av_log(s, AV_LOG_TRACE, "NSV got header; filepos %"PRId64"\n", avio_tell(pb));
303 
304  if (strings_size > 0) {
305  char *strings; /* last byte will be '\0' to play safe with str*() */
306  char *p, *endp;
307  char *token, *value;
308  char quote;
309 
310  p = strings = av_mallocz((size_t)strings_size + 1);
311  if (!p)
312  return AVERROR(ENOMEM);
313  endp = strings + strings_size;
314  avio_read(pb, strings, strings_size);
315  while (p < endp) {
316  while (*p == ' ')
317  p++; /* strip out spaces */
318  if (p >= endp-2)
319  break;
320  token = p;
321  p = strchr(p, '=');
322  if (!p || p >= endp-2)
323  break;
324  *p++ = '\0';
325  quote = *p++;
326  value = p;
327  p = strchr(p, quote);
328  if (!p || p >= endp)
329  break;
330  *p++ = '\0';
331  av_log(s, AV_LOG_TRACE, "NSV NSVf INFO: %s='%s'\n", token, value);
332  av_dict_set(&s->metadata, token, value, 0);
333  }
334  av_free(strings);
335  }
336  if (pb->eof_reached)
337  return -1;
338 
339  av_log(s, AV_LOG_TRACE, "NSV got infos; filepos %"PRId64"\n", avio_tell(pb));
340 
341  if (table_entries_used > 0) {
342  int i;
343  nsv->index_entries = table_entries_used;
344  if((unsigned)table_entries_used >= UINT_MAX / sizeof(uint32_t))
345  return -1;
346  nsv->nsvs_file_offset = av_malloc((unsigned)table_entries_used * sizeof(uint32_t));
347  if (!nsv->nsvs_file_offset)
348  return AVERROR(ENOMEM);
349 
350  for(i=0;i<table_entries_used;i++)
351  nsv->nsvs_file_offset[i] = avio_rl32(pb) + size;
352 
353  if(table_entries > table_entries_used &&
354  avio_rl32(pb) == MKTAG('T','O','C','2')) {
355  nsv->nsvs_timestamps = av_malloc((unsigned)table_entries_used*sizeof(uint32_t));
356  if (!nsv->nsvs_timestamps)
357  return AVERROR(ENOMEM);
358  for(i=0;i<table_entries_used;i++) {
359  nsv->nsvs_timestamps[i] = avio_rl32(pb);
360  }
361  }
362  }
363 
364  av_log(s, AV_LOG_TRACE, "NSV got index; filepos %"PRId64"\n", avio_tell(pb));
365 
366  avio_seek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
367 
368  if (pb->eof_reached)
369  return -1;
370  nsv->state = NSV_HAS_READ_NSVF;
371  return 0;
372 }
373 
375 {
376  NSVContext *nsv = s->priv_data;
377  AVIOContext *pb = s->pb;
378  uint32_t vtag, atag;
379  uint16_t vwidth, vheight;
380  AVRational framerate;
381  int i;
382  AVStream *st;
383  NSVStream *nst;
384  av_log(s, AV_LOG_TRACE, "%s()\n", __FUNCTION__);
385 
386  vtag = avio_rl32(pb);
387  atag = avio_rl32(pb);
388  vwidth = avio_rl16(pb);
389  vheight = avio_rl16(pb);
390  i = avio_r8(pb);
391 
392  av_log(s, AV_LOG_TRACE, "NSV NSVs framerate code %2x\n", i);
393  if(i&0x80) { /* odd way of giving native framerates from docs */
394  int t=(i & 0x7F)>>2;
395  if(t<16) framerate = (AVRational){1, t+1};
396  else framerate = (AVRational){t-15, 1};
397 
398  if(i&1){
399  framerate.num *= 1000;
400  framerate.den *= 1001;
401  }
402 
403  if((i&3)==3) framerate.num *= 24;
404  else if((i&3)==2) framerate.num *= 25;
405  else framerate.num *= 30;
406  }
407  else
408  framerate= (AVRational){i, 1};
409 
410  nsv->avsync = avio_rl16(pb);
411  nsv->framerate = framerate;
412 
413  print_tag("NSV NSVs vtag", vtag, 0);
414  print_tag("NSV NSVs atag", atag, 0);
415  av_log(s, AV_LOG_TRACE, "NSV NSVs vsize %dx%d\n", vwidth, vheight);
416 
417  /* XXX change to ap != NULL ? */
418  if (s->nb_streams == 0) { /* streams not yet published, let's do that */
419  nsv->vtag = vtag;
420  nsv->atag = atag;
421  nsv->vwidth = vwidth;
422  nsv->vheight = vwidth;
423  if (vtag != T_NONE) {
424  int i;
425  st = avformat_new_stream(s, NULL);
426  if (!st)
427  goto fail;
428 
429  st->id = NSV_ST_VIDEO;
430  nst = av_mallocz(sizeof(NSVStream));
431  if (!nst)
432  goto fail;
433  st->priv_data = nst;
435  st->codecpar->codec_tag = vtag;
436  st->codecpar->codec_id = ff_codec_get_id(nsv_codec_video_tags, vtag);
437  st->codecpar->width = vwidth;
438  st->codecpar->height = vheight;
439  st->codecpar->bits_per_coded_sample = 24; /* depth XXX */
440 
441  avpriv_set_pts_info(st, 64, framerate.den, framerate.num);
442  st->start_time = 0;
443  st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
444 
445  for(i=0;i<nsv->index_entries;i++) {
446  if(nsv->nsvs_timestamps) {
448  0, 0, AVINDEX_KEYFRAME);
449  } else {
450  int64_t ts = av_rescale(i*nsv->duration/nsv->index_entries, framerate.num, 1000*framerate.den);
451  av_add_index_entry(st, nsv->nsvs_file_offset[i], ts, 0, 0, AVINDEX_KEYFRAME);
452  }
453  }
454  }
455  if (atag != T_NONE) {
456  st = avformat_new_stream(s, NULL);
457  if (!st)
458  goto fail;
459 
460  st->id = NSV_ST_AUDIO;
461  nst = av_mallocz(sizeof(NSVStream));
462  if (!nst)
463  goto fail;
464  st->priv_data = nst;
466  st->codecpar->codec_tag = atag;
467  st->codecpar->codec_id = ff_codec_get_id(nsv_codec_audio_tags, atag);
468 
469  st->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */
470 
471  /* set timebase to common denominator of ms and framerate */
472  avpriv_set_pts_info(st, 64, 1, framerate.num*1000);
473  st->start_time = 0;
474  st->duration = (int64_t)nsv->duration * framerate.num;
475  }
476  } else {
477  if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
478  av_log(s, AV_LOG_TRACE, "NSV NSVs header values differ from the first one!!!\n");
479  //return -1;
480  }
481  }
482 
483  nsv->state = NSV_HAS_READ_NSVS;
484  return 0;
485 fail:
486  /* XXX */
487  nsv->state = NSV_UNSYNC;
488  return -1;
489 }
490 
492 {
493  NSVContext *nsv = s->priv_data;
494  int i, err;
495 
496  av_log(s, AV_LOG_TRACE, "%s()\n", __FUNCTION__);
497  av_log(s, AV_LOG_TRACE, "filename '%s'\n", s->filename);
498 
499  nsv->state = NSV_UNSYNC;
500  nsv->ahead[0].data = nsv->ahead[1].data = NULL;
501 
502  for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
503  if (nsv_resync(s) < 0)
504  return -1;
505  if (nsv->state == NSV_FOUND_NSVF) {
506  err = nsv_parse_NSVf_header(s);
507  if (err < 0)
508  return err;
509  }
510  /* we need the first NSVs also... */
511  if (nsv->state == NSV_FOUND_NSVS) {
512  err = nsv_parse_NSVs_header(s);
513  if (err < 0)
514  return err;
515  break; /* we just want the first one */
516  }
517  }
518  if (s->nb_streams < 1) /* no luck so far */
519  return -1;
520  /* now read the first chunk, so we can attempt to decode more info */
521  err = nsv_read_chunk(s, 1);
522 
523  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  av_log(s, AV_LOG_TRACE, "%s(%d)\n", __FUNCTION__, fill_header);
542 
543  if (nsv->ahead[0].data || nsv->ahead[1].data)
544  return 0; //-1; /* hey! eat what you've in your plate first! */
545 
546 null_chunk_retry:
547  if (pb->eof_reached)
548  return -1;
549 
550  for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
551  err = nsv_resync(s);
552  if (err < 0)
553  return err;
554  if (nsv->state == NSV_FOUND_NSVS)
555  err = nsv_parse_NSVs_header(s);
556  if (err < 0)
557  return err;
558  if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
559  return -1;
560 
561  auxcount = avio_r8(pb);
562  vsize = avio_rl16(pb);
563  asize = avio_rl16(pb);
564  vsize = (vsize << 4) | (auxcount >> 4);
565  auxcount &= 0x0f;
566  av_log(s, AV_LOG_TRACE, "NSV CHUNK %d aux, %u bytes video, %d bytes audio\n", auxcount, vsize, asize);
567  /* skip aux stuff */
568  for (i = 0; i < auxcount; i++) {
569  uint32_t av_unused auxtag;
570  auxsize = avio_rl16(pb);
571  auxtag = avio_rl32(pb);
572  av_log(s, AV_LOG_TRACE, "NSV aux data: '%c%c%c%c', %d bytes\n",
573  (auxtag & 0x0ff),
574  ((auxtag >> 8) & 0x0ff),
575  ((auxtag >> 16) & 0x0ff),
576  ((auxtag >> 24) & 0x0ff),
577  auxsize);
578  avio_skip(pb, auxsize);
579  vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming brain-dead */
580  }
581 
582  if (pb->eof_reached)
583  return -1;
584  if (!vsize && !asize) {
585  nsv->state = NSV_UNSYNC;
586  goto null_chunk_retry;
587  }
588 
589  /* map back streams to v,a */
590  if (s->nb_streams > 0)
591  st[s->streams[0]->id] = s->streams[0];
592  if (s->nb_streams > 1)
593  st[s->streams[1]->id] = s->streams[1];
594 
595  if (vsize && st[NSV_ST_VIDEO]) {
596  nst = st[NSV_ST_VIDEO]->priv_data;
597  pkt = &nsv->ahead[NSV_ST_VIDEO];
598  if ((ret = av_get_packet(pb, pkt, vsize)) < 0)
599  return ret;
600  pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
601  pkt->dts = nst->frame_offset;
602  pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
603  for (i = 0; i < FFMIN(8, vsize); i++)
604  av_log(s, AV_LOG_TRACE, "NSV video: [%d] = %02x\n", i, pkt->data[i]);
605  }
606  if(st[NSV_ST_VIDEO])
607  ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++;
608 
609  if (asize && st[NSV_ST_AUDIO]) {
610  nst = st[NSV_ST_AUDIO]->priv_data;
611  pkt = &nsv->ahead[NSV_ST_AUDIO];
612  /* read raw audio specific header on the first audio chunk... */
613  /* on ALL audio chunks ?? seems so! */
614  if (asize && st[NSV_ST_AUDIO]->codecpar->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
615  uint8_t bps;
616  uint8_t channels;
617  uint16_t samplerate;
618  bps = avio_r8(pb);
619  channels = avio_r8(pb);
620  samplerate = avio_rl16(pb);
621  if (!channels || !samplerate)
622  return AVERROR_INVALIDDATA;
623  asize-=4;
624  av_log(s, AV_LOG_TRACE, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
625  if (fill_header) {
626  st[NSV_ST_AUDIO]->need_parsing = AVSTREAM_PARSE_NONE; /* we know everything */
627  if (bps != 16) {
628  av_log(s, AV_LOG_TRACE, "NSV AUDIO bit/sample != 16 (%d)!!!\n", bps);
629  }
630  bps /= channels; // ???
631  if (bps == 8)
633  samplerate /= 4;/* UGH ??? XXX */
634  channels = 1;
635  st[NSV_ST_AUDIO]->codecpar->channels = channels;
636  st[NSV_ST_AUDIO]->codecpar->sample_rate = samplerate;
637  av_log(s, AV_LOG_TRACE, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
638  }
639  }
640  if ((ret = av_get_packet(pb, pkt, asize)) < 0)
641  return ret;
642  pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
643  pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
644  if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) {
645  /* on a nsvs frame we have new information on a/v sync */
646  pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1);
647  pkt->dts *= (int64_t)1000 * nsv->framerate.den;
648  pkt->dts += (int64_t)nsv->avsync * nsv->framerate.num;
649  av_log(s, AV_LOG_TRACE, "NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts);
650  }
651  nst->frame_offset++;
652  }
653 
654  nsv->state = NSV_UNSYNC;
655  return 0;
656 }
657 
658 
660 {
661  NSVContext *nsv = s->priv_data;
662  int i, err = 0;
663 
664  av_log(s, AV_LOG_TRACE, "%s()\n", __FUNCTION__);
665 
666  /* in case we don't already have something to eat ... */
667  if (!nsv->ahead[0].data && !nsv->ahead[1].data)
668  err = nsv_read_chunk(s, 0);
669  if (err < 0)
670  return err;
671 
672  /* now pick one of the plates */
673  for (i = 0; i < 2; i++) {
674  if (nsv->ahead[i].data) {
675  av_log(s, AV_LOG_TRACE, "%s: using cached packet[%d]\n", __FUNCTION__, i);
676  /* avoid the cost of new_packet + memcpy(->data) */
677  memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket));
678  nsv->ahead[i].data = NULL; /* we ate that one */
679  return pkt->size;
680  }
681  }
682 
683  /* this restaurant is not provisioned :^] */
684  return -1;
685 }
686 
687 static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
688 {
689  NSVContext *nsv = s->priv_data;
690  AVStream *st = s->streams[stream_index];
691  NSVStream *nst = st->priv_data;
692  int index;
693 
694  index = av_index_search_timestamp(st, timestamp, flags);
695  if(index < 0)
696  return -1;
697 
698  if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
699  return -1;
700 
702  nsv->state = NSV_UNSYNC;
703  return 0;
704 }
705 
707 {
708  NSVContext *nsv = s->priv_data;
709 
710  av_freep(&nsv->nsvs_file_offset);
711  av_freep(&nsv->nsvs_timestamps);
712  if (nsv->ahead[0].data)
713  av_packet_unref(&nsv->ahead[0]);
714  if (nsv->ahead[1].data)
715  av_packet_unref(&nsv->ahead[1]);
716  return 0;
717 }
718 
719 static int nsv_probe(AVProbeData *p)
720 {
721  int i;
722  int score;
723  int vsize, asize, auxcount;
724  score = 0;
725  av_log(NULL, AV_LOG_TRACE, "nsv_probe(), buf_size %d\n", p->buf_size);
726  /* check file header */
727  /* streamed files might not have any header */
728  if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
729  p->buf[2] == 'V' && (p->buf[3] == 'f' || p->buf[3] == 's'))
730  return AVPROBE_SCORE_MAX;
731  /* XXX: do streamed files always start at chunk boundary ?? */
732  /* or do we need to search NSVs in the byte stream ? */
733  /* seems the servers don't bother starting clean chunks... */
734  /* sometimes even the first header is at 9KB or something :^) */
735  for (i = 1; i < p->buf_size - 3; i++) {
736  if (p->buf[i+0] == 'N' && p->buf[i+1] == 'S' &&
737  p->buf[i+2] == 'V' && p->buf[i+3] == 's') {
738  score = AVPROBE_SCORE_MAX/5;
739  /* Get the chunk size and check if at the end we are getting 0xBEEF */
740  auxcount = p->buf[i+19];
741  vsize = p->buf[i+20] | p->buf[i+21] << 8;
742  asize = p->buf[i+22] | p->buf[i+23] << 8;
743  vsize = (vsize << 4) | (auxcount >> 4);
744  if ((asize + vsize + i + 23) < p->buf_size - 2) {
745  if (p->buf[i+23+asize+vsize+1] == 0xEF &&
746  p->buf[i+23+asize+vsize+2] == 0xBE)
747  return AVPROBE_SCORE_MAX-20;
748  }
749  }
750  }
751  /* so we'll have more luck on extension... */
752  if (av_match_ext(p->filename, "nsv"))
754  /* FIXME: add mime-type check */
755  return score;
756 }
757 
759  .name = "nsv",
760  .long_name = NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"),
761  .priv_data_size = sizeof(NSVContext),
767 };
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:62
Bytestream IO Context.
Definition: avio.h:104
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
int size
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:1214
static const AVCodecTag nsv_codec_video_tags[]
Definition: nsvdec.c:184
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:1983
static int nsv_parse_NSVf_header(AVFormatContext *s)
Definition: nsvdec.c:266
uint32_t * nsvs_file_offset
Definition: nsvdec.c:171
uint16_t vheight
Definition: nsvdec.c:178
const char * filename
Definition: avformat.h:399
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:2986
uint32_t * nsvs_timestamps
Definition: nsvdec.c:181
int64_t pos
Definition: avformat.h:664
#define TB_NSVF
Definition: nsvdec.c:137
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:3483
int rate
Definition: nsvdec.c:160
int num
numerator
Definition: rational.h:44
int index
stream index in AVFormatContext
Definition: avformat.h:706
int size
Definition: avcodec.h:1347
av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (%s)\, len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic ? ac->func_descr_generic :ac->func_descr)
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:242
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:890
void * priv_data
Definition: avformat.h:720
int sample_size
Definition: nsvdec.c:161
#define NSV_MAX_RESYNC
Definition: nsvdec.c:33
static const AVCodecTag nsv_codec_audio_tags[]
Definition: nsvdec.c:203
Macro definitions for various function/variable attributes.
int base_offset
Definition: nsvdec.c:169
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:202
Format I/O context.
Definition: avformat.h:940
Public dictionary API.
#define NSV_MAX_RESYNC_TRIES
Definition: nsvdec.c:34
#define NSV_ST_AUDIO
Definition: nsvdec.c:142
uint8_t
int width
Video only.
Definition: avcodec.h:3525
#define AV_LOG_TRACE
Extremely verbose debugging, useful for libav* development.
Definition: log.h:150
enum AVStreamParseType need_parsing
Definition: avformat.h:879
int id
Format-specific stream ID.
Definition: avformat.h:712
int frame_offset
Definition: nsvdec.c:157
int NSVf_end
Definition: nsvdec.c:170
int start
Definition: nsvdec.c:162
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2648
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1008
int64_t duration
Definition: movenc.c:63
int new_frame_offset
Definition: nsvdec.c:164
uint8_t * data
Definition: avcodec.h:1346
static int flags
Definition: log.c:50
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:117
static int nsv_resync(AVFormatContext *s)
Definition: nsvdec.c:223
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:77
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:295
static int nsv_read_close(AVFormatContext *s)
Definition: nsvdec.c:706
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:545
#define NSV_ST_VIDEO
Definition: nsvdec.c:141
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1378
static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: nsvdec.c:659
int64_t duration
Definition: nsvdec.c:176
#define AVINDEX_KEYFRAME
Definition: avformat.h:666
AVPacket ahead[2]
Definition: nsvdec.c:174
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1148
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:190
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:1255
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:665
#define AVERROR(e)
Definition: error.h:43
int64_t timestamp
Definition: avformat.h:665
uint16_t vwidth
Definition: nsvdec.c:178
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:148
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:479
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3479
AVRational framerate
Definition: nsvdec.c:180
#define fail()
Definition: checkasm.h:80
static int nsv_read_chunk(AVFormatContext *s, int fill_header)
Definition: nsvdec.c:527
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1352
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:536
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:401
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:400
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:996
AVInputFormat ff_nsv_demuxer
Definition: nsvdec.c:758
static int nsv_parse_NSVs_header(AVFormatContext *s)
Definition: nsvdec.c:374
int scale
Definition: nsvdec.c:159
char filename[1024]
input or output filename
Definition: avformat.h:1016
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:86
static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: nsvdec.c:687
#define FFMIN(a, b)
Definition: common.h:66
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
NSVStatus
Definition: nsvdec.c:145
static av_always_inline int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: avio.h:286
uint32_t vtag
Definition: nsvdec.c:177
static int nsv_probe(AVProbeData *p)
Definition: nsvdec.c:719
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:546
Stream structure.
Definition: avformat.h:705
NULL
Definition: eval.c:55
AVIOContext * pb
I/O context.
Definition: avformat.h:982
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:347
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: libcdio.c:114
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:68
#define T_NONE
Definition: nsvdec.c:132
int index
Definition: gxfenc.c:72
rational number numerator/denominator
Definition: rational.h:43
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:405
This structure contains the data a format has to probe a file.
Definition: avformat.h:398
static int nsv_read_header(AVFormatContext *s)
Definition: nsvdec.c:491
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:757
int sample_rate
Audio only.
Definition: avcodec.h:3564
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:407
full parsing and repack
Definition: avformat.h:657
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:649
Main libavformat public API header.
int cum_len
Definition: nsvdec.c:165
static struct @174 state
enum NSVStatus state
Definition: nsvdec.c:173
int64_t start_time
Decoding: pts of the first frame of the stream, in stream time base.
Definition: avformat.h:750
uint32_t atag
Definition: nsvdec.c:177
int den
denominator
Definition: rational.h:45
unsigned bps
Definition: movenc.c:855
#define MKBETAG(a, b, c, d)
Definition: common.h:257
int index_entries
Definition: nsvdec.c:172
int eof_reached
true if eof reached
Definition: avio.h:132
void * priv_data
Format private data.
Definition: avformat.h:968
int bits_per_coded_sample
Definition: avcodec.h:3514
int channels
Audio only.
Definition: avcodec.h:3560
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1345
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:529
AVCodecParameters * codecpar
Definition: avformat.h:831
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3487
int16_t avsync
Definition: nsvdec.c:179
int stream_index
Definition: avcodec.h:1348
#define MKTAG(a, b, c, d)
Definition: common.h:256
#define print_tag(str, tag, size)
Definition: nsvdec.c:215
This structure stores compressed data.
Definition: avcodec.h:1323
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:211
#define av_unused
Definition: attributes.h:86