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 veiwing 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 nstrailer (which doesn't have an NSVf header), it repports 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 {
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  //DVDemuxContext* dv_demux;
183 } NSVContext;
184 
186  { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
187  { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
188  { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
189  { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') },
190  { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
191  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
192  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
193  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
194  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
195 /*
196  { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
197  { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
198 */
199  { AV_CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
200  { AV_CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
201  { AV_CODEC_ID_NONE, 0 },
202 };
203 
205  { AV_CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') },
206  { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') },
207  { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') },
208  { AV_CODEC_ID_SPEEX, MKTAG('S', 'P', 'X', ' ') },
209  { AV_CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
210  { AV_CODEC_ID_NONE, 0 },
211 };
212 
213 //static int nsv_load_index(AVFormatContext *s);
214 static int nsv_read_chunk(AVFormatContext *s, int fill_header);
215 
216 #define print_tag(str, tag, size) \
217  av_dlog(NULL, "%s: tag=%c%c%c%c\n", \
218  str, tag & 0xff, \
219  (tag >> 8) & 0xff, \
220  (tag >> 16) & 0xff, \
221  (tag >> 24) & 0xff);
222 
223 /* try to find something we recognize, and set the state accordingly */
225 {
226  NSVContext *nsv = s->priv_data;
227  AVIOContext *pb = s->pb;
228  uint32_t v = 0;
229  int i;
230 
231  av_dlog(s, "%s(), offset = %"PRId64", state = %d\n", __FUNCTION__, avio_tell(pb), nsv->state);
232 
233  //nsv->state = NSV_UNSYNC;
234 
235  for (i = 0; i < NSV_MAX_RESYNC; i++) {
236  if (pb->eof_reached) {
237  av_dlog(s, "NSV EOF\n");
238  nsv->state = NSV_UNSYNC;
239  return -1;
240  }
241  v <<= 8;
242  v |= avio_r8(pb);
243  if (i < 8) {
244  av_dlog(s, "NSV resync: [%d] = %02x\n", i, v & 0x0FF);
245  }
246 
247  if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
248  av_dlog(s, "NSV resynced on BEEF after %d bytes\n", i+1);
249  nsv->state = NSV_FOUND_BEEF;
250  return 0;
251  }
252  /* we read as big-endian, thus the MK*BE* */
253  if (v == TB_NSVF) { /* NSVf */
254  av_dlog(s, "NSV resynced on NSVf after %d bytes\n", i+1);
255  nsv->state = NSV_FOUND_NSVF;
256  return 0;
257  }
258  if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
259  av_dlog(s, "NSV resynced on NSVs after %d bytes\n", i+1);
260  nsv->state = NSV_FOUND_NSVS;
261  return 0;
262  }
263 
264  }
265  av_dlog(s, "NSV sync lost\n");
266  return -1;
267 }
268 
270 {
271  NSVContext *nsv = s->priv_data;
272  AVIOContext *pb = s->pb;
273  unsigned int av_unused file_size;
274  unsigned int size;
275  int64_t duration;
276  int strings_size;
277  int table_entries;
278  int table_entries_used;
279 
280  av_dlog(s, "%s()\n", __FUNCTION__);
281 
282  nsv->state = NSV_UNSYNC; /* in case we fail */
283 
284  size = avio_rl32(pb);
285  if (size < 28)
286  return -1;
287  nsv->NSVf_end = size;
288 
289  //s->file_size = (uint32_t)avio_rl32(pb);
290  file_size = (uint32_t)avio_rl32(pb);
291  av_dlog(s, "NSV NSVf chunk_size %u\n", size);
292  av_dlog(s, "NSV NSVf file_size %u\n", file_size);
293 
294  nsv->duration = duration = avio_rl32(pb); /* in ms */
295  av_dlog(s, "NSV NSVf duration %"PRId64" ms\n", duration);
296  // XXX: store it in AVStreams
297 
298  strings_size = avio_rl32(pb);
299  table_entries = avio_rl32(pb);
300  table_entries_used = avio_rl32(pb);
301  av_dlog(s, "NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
302  strings_size, table_entries, table_entries_used);
303  if (pb->eof_reached)
304  return -1;
305 
306  av_dlog(s, "NSV got header; filepos %"PRId64"\n", avio_tell(pb));
307 
308  if (strings_size > 0) {
309  char *strings; /* last byte will be '\0' to play safe with str*() */
310  char *p, *endp;
311  char *token, *value;
312  char quote;
313 
314  p = strings = av_mallocz((size_t)strings_size + 1);
315  if (!p)
316  return AVERROR(ENOMEM);
317  endp = strings + strings_size;
318  avio_read(pb, strings, strings_size);
319  while (p < endp) {
320  while (*p == ' ')
321  p++; /* strip out spaces */
322  if (p >= endp-2)
323  break;
324  token = p;
325  p = strchr(p, '=');
326  if (!p || p >= endp-2)
327  break;
328  *p++ = '\0';
329  quote = *p++;
330  value = p;
331  p = strchr(p, quote);
332  if (!p || p >= endp)
333  break;
334  *p++ = '\0';
335  av_dlog(s, "NSV NSVf INFO: %s='%s'\n", token, value);
336  av_dict_set(&s->metadata, token, value, 0);
337  }
338  av_free(strings);
339  }
340  if (pb->eof_reached)
341  return -1;
342 
343  av_dlog(s, "NSV got infos; filepos %"PRId64"\n", avio_tell(pb));
344 
345  if (table_entries_used > 0) {
346  int i;
347  nsv->index_entries = table_entries_used;
348  if((unsigned)table_entries_used >= UINT_MAX / sizeof(uint32_t))
349  return -1;
350  nsv->nsvs_file_offset = av_malloc((unsigned)table_entries_used * sizeof(uint32_t));
351  if (!nsv->nsvs_file_offset)
352  return AVERROR(ENOMEM);
353 
354  for(i=0;i<table_entries_used;i++)
355  nsv->nsvs_file_offset[i] = avio_rl32(pb) + size;
356 
357  if(table_entries > table_entries_used &&
358  avio_rl32(pb) == MKTAG('T','O','C','2')) {
359  nsv->nsvs_timestamps = av_malloc((unsigned)table_entries_used*sizeof(uint32_t));
360  if (!nsv->nsvs_timestamps)
361  return AVERROR(ENOMEM);
362  for(i=0;i<table_entries_used;i++) {
363  nsv->nsvs_timestamps[i] = avio_rl32(pb);
364  }
365  }
366  }
367 
368  av_dlog(s, "NSV got index; filepos %"PRId64"\n", avio_tell(pb));
369 
370  avio_seek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
371 
372  if (pb->eof_reached)
373  return -1;
374  nsv->state = NSV_HAS_READ_NSVF;
375  return 0;
376 }
377 
379 {
380  NSVContext *nsv = s->priv_data;
381  AVIOContext *pb = s->pb;
382  uint32_t vtag, atag;
383  uint16_t vwidth, vheight;
384  AVRational framerate;
385  int i;
386  AVStream *st;
387  NSVStream *nst;
388  av_dlog(s, "%s()\n", __FUNCTION__);
389 
390  vtag = avio_rl32(pb);
391  atag = avio_rl32(pb);
392  vwidth = avio_rl16(pb);
393  vheight = avio_rl16(pb);
394  i = avio_r8(pb);
395 
396  av_dlog(s, "NSV NSVs framerate code %2x\n", i);
397  if(i&0x80) { /* odd way of giving native framerates from docs */
398  int t=(i & 0x7F)>>2;
399  if(t<16) framerate = (AVRational){1, t+1};
400  else framerate = (AVRational){t-15, 1};
401 
402  if(i&1){
403  framerate.num *= 1000;
404  framerate.den *= 1001;
405  }
406 
407  if((i&3)==3) framerate.num *= 24;
408  else if((i&3)==2) framerate.num *= 25;
409  else framerate.num *= 30;
410  }
411  else
412  framerate= (AVRational){i, 1};
413 
414  nsv->avsync = avio_rl16(pb);
415  nsv->framerate = framerate;
416 
417  print_tag("NSV NSVs vtag", vtag, 0);
418  print_tag("NSV NSVs atag", atag, 0);
419  av_dlog(s, "NSV NSVs vsize %dx%d\n", vwidth, vheight);
420 
421  /* XXX change to ap != NULL ? */
422  if (s->nb_streams == 0) { /* streams not yet published, let's do that */
423  nsv->vtag = vtag;
424  nsv->atag = atag;
425  nsv->vwidth = vwidth;
426  nsv->vheight = vwidth;
427  if (vtag != T_NONE) {
428  int i;
429  st = avformat_new_stream(s, NULL);
430  if (!st)
431  goto fail;
432 
433  st->id = NSV_ST_VIDEO;
434  nst = av_mallocz(sizeof(NSVStream));
435  if (!nst)
436  goto fail;
437  st->priv_data = nst;
439  st->codec->codec_tag = vtag;
440  st->codec->codec_id = ff_codec_get_id(nsv_codec_video_tags, vtag);
441  st->codec->width = vwidth;
442  st->codec->height = vheight;
443  st->codec->bits_per_coded_sample = 24; /* depth XXX */
444 
445  avpriv_set_pts_info(st, 64, framerate.den, framerate.num);
446  st->start_time = 0;
447  st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
448 
449  for(i=0;i<nsv->index_entries;i++) {
450  if(nsv->nsvs_timestamps) {
452  0, 0, AVINDEX_KEYFRAME);
453  } else {
454  int64_t ts = av_rescale(i*nsv->duration/nsv->index_entries, framerate.num, 1000*framerate.den);
455  av_add_index_entry(st, nsv->nsvs_file_offset[i], ts, 0, 0, AVINDEX_KEYFRAME);
456  }
457  }
458  }
459  if (atag != T_NONE) {
460  st = avformat_new_stream(s, NULL);
461  if (!st)
462  goto fail;
463 
464  st->id = NSV_ST_AUDIO;
465  nst = av_mallocz(sizeof(NSVStream));
466  if (!nst)
467  goto fail;
468  st->priv_data = nst;
470  st->codec->codec_tag = atag;
471  st->codec->codec_id = ff_codec_get_id(nsv_codec_audio_tags, atag);
472 
473  st->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */
474 
475  /* set timebase to common denominator of ms and framerate */
476  avpriv_set_pts_info(st, 64, 1, framerate.num*1000);
477  st->start_time = 0;
478  st->duration = (int64_t)nsv->duration * framerate.num;
479  }
480  } else {
481  if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
482  av_dlog(s, "NSV NSVs header values differ from the first one!!!\n");
483  //return -1;
484  }
485  }
486 
487  nsv->state = NSV_HAS_READ_NSVS;
488  return 0;
489 fail:
490  /* XXX */
491  nsv->state = NSV_UNSYNC;
492  return -1;
493 }
494 
496 {
497  NSVContext *nsv = s->priv_data;
498  int i, err;
499 
500  av_dlog(s, "%s()\n", __FUNCTION__);
501  av_dlog(s, "filename '%s'\n", s->filename);
502 
503  nsv->state = NSV_UNSYNC;
504  nsv->ahead[0].data = nsv->ahead[1].data = NULL;
505 
506  for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
507  if (nsv_resync(s) < 0)
508  return -1;
509  if (nsv->state == NSV_FOUND_NSVF) {
510  err = nsv_parse_NSVf_header(s);
511  if (err < 0)
512  return err;
513  }
514  /* we need the first NSVs also... */
515  if (nsv->state == NSV_FOUND_NSVS) {
516  err = nsv_parse_NSVs_header(s);
517  if (err < 0)
518  return err;
519  break; /* we just want the first one */
520  }
521  }
522  if (s->nb_streams < 1) /* no luck so far */
523  return -1;
524  /* now read the first chunk, so we can attempt to decode more info */
525  err = nsv_read_chunk(s, 1);
526 
527  av_dlog(s, "parsed header\n");
528  return err;
529 }
530 
531 static int nsv_read_chunk(AVFormatContext *s, int fill_header)
532 {
533  NSVContext *nsv = s->priv_data;
534  AVIOContext *pb = s->pb;
535  AVStream *st[2] = {NULL, NULL};
536  NSVStream *nst;
537  AVPacket *pkt;
538  int i, err = 0;
539  uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
540  uint32_t vsize;
541  uint16_t asize;
542  uint16_t auxsize;
543 
544  av_dlog(s, "%s(%d)\n", __FUNCTION__, fill_header);
545 
546  if (nsv->ahead[0].data || nsv->ahead[1].data)
547  return 0; //-1; /* hey! eat what you've in your plate first! */
548 
549 null_chunk_retry:
550  if (pb->eof_reached)
551  return -1;
552 
553  for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
554  err = nsv_resync(s);
555  if (err < 0)
556  return err;
557  if (nsv->state == NSV_FOUND_NSVS)
558  err = nsv_parse_NSVs_header(s);
559  if (err < 0)
560  return err;
561  if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
562  return -1;
563 
564  auxcount = avio_r8(pb);
565  vsize = avio_rl16(pb);
566  asize = avio_rl16(pb);
567  vsize = (vsize << 4) | (auxcount >> 4);
568  auxcount &= 0x0f;
569  av_dlog(s, "NSV CHUNK %d aux, %u bytes video, %d bytes audio\n", auxcount, vsize, asize);
570  /* skip aux stuff */
571  for (i = 0; i < auxcount; i++) {
572  uint32_t av_unused auxtag;
573  auxsize = avio_rl16(pb);
574  auxtag = avio_rl32(pb);
575  av_dlog(s, "NSV aux data: '%c%c%c%c', %d bytes\n",
576  (auxtag & 0x0ff),
577  ((auxtag >> 8) & 0x0ff),
578  ((auxtag >> 16) & 0x0ff),
579  ((auxtag >> 24) & 0x0ff),
580  auxsize);
581  avio_skip(pb, auxsize);
582  vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */
583  }
584 
585  if (pb->eof_reached)
586  return -1;
587  if (!vsize && !asize) {
588  nsv->state = NSV_UNSYNC;
589  goto null_chunk_retry;
590  }
591 
592  /* map back streams to v,a */
593  if (s->nb_streams > 0)
594  st[s->streams[0]->id] = s->streams[0];
595  if (s->nb_streams > 1)
596  st[s->streams[1]->id] = s->streams[1];
597 
598  if (vsize && st[NSV_ST_VIDEO]) {
599  nst = st[NSV_ST_VIDEO]->priv_data;
600  pkt = &nsv->ahead[NSV_ST_VIDEO];
601  av_get_packet(pb, pkt, vsize);
602  pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
603  pkt->dts = nst->frame_offset;
604  pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
605  for (i = 0; i < FFMIN(8, vsize); i++)
606  av_dlog(s, "NSV video: [%d] = %02x\n", i, pkt->data[i]);
607  }
608  if(st[NSV_ST_VIDEO])
609  ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++;
610 
611  if (asize && st[NSV_ST_AUDIO]) {
612  nst = st[NSV_ST_AUDIO]->priv_data;
613  pkt = &nsv->ahead[NSV_ST_AUDIO];
614  /* read raw audio specific header on the first audio chunk... */
615  /* on ALL audio chunks ?? seems so! */
616  if (asize && st[NSV_ST_AUDIO]->codec->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
617  uint8_t bps;
618  uint8_t channels;
619  uint16_t samplerate;
620  bps = avio_r8(pb);
621  channels = avio_r8(pb);
622  samplerate = avio_rl16(pb);
623  asize-=4;
624  av_dlog(s, "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_dlog(s, "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]->codec->channels = channels;
636  st[NSV_ST_AUDIO]->codec->sample_rate = samplerate;
637  av_dlog(s, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
638  }
639  }
640  av_get_packet(pb, pkt, asize);
641  pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
642  pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
643  if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) {
644  /* on a nsvs frame we have new information on a/v sync */
645  pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1);
646  pkt->dts *= (int64_t)1000 * nsv->framerate.den;
647  pkt->dts += (int64_t)nsv->avsync * nsv->framerate.num;
648  av_dlog(s, "NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts);
649  }
650  nst->frame_offset++;
651  }
652 
653  nsv->state = NSV_UNSYNC;
654  return 0;
655 }
656 
657 
659 {
660  NSVContext *nsv = s->priv_data;
661  int i, err = 0;
662 
663  av_dlog(s, "%s()\n", __FUNCTION__);
664 
665  /* in case we don't already have something to eat ... */
666  if (!nsv->ahead[0].data && !nsv->ahead[1].data)
667  err = nsv_read_chunk(s, 0);
668  if (err < 0)
669  return err;
670 
671  /* now pick one of the plates */
672  for (i = 0; i < 2; i++) {
673  if (nsv->ahead[i].data) {
674  av_dlog(s, "%s: using cached packet[%d]\n", __FUNCTION__, i);
675  /* avoid the cost of new_packet + memcpy(->data) */
676  memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket));
677  nsv->ahead[i].data = NULL; /* we ate that one */
678  return pkt->size;
679  }
680  }
681 
682  /* this restaurant is not approvisionned :^] */
683  return -1;
684 }
685 
686 static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
687 {
688  NSVContext *nsv = s->priv_data;
689  AVStream *st = s->streams[stream_index];
690  NSVStream *nst = st->priv_data;
691  int index;
692 
693  index = av_index_search_timestamp(st, timestamp, flags);
694  if(index < 0)
695  return -1;
696 
697  if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
698  return -1;
699 
701  nsv->state = NSV_UNSYNC;
702  return 0;
703 }
704 
706 {
707  NSVContext *nsv = s->priv_data;
708 
709  av_freep(&nsv->nsvs_file_offset);
710  av_freep(&nsv->nsvs_timestamps);
711  if (nsv->ahead[0].data)
712  av_free_packet(&nsv->ahead[0]);
713  if (nsv->ahead[1].data)
714  av_free_packet(&nsv->ahead[1]);
715  return 0;
716 }
717 
718 static int nsv_probe(AVProbeData *p)
719 {
720  int i;
721  int score;
722  int vsize, asize, auxcount;
723  score = 0;
724  av_dlog(NULL, "nsv_probe(), buf_size %d\n", p->buf_size);
725  /* check file header */
726  /* streamed files might not have any header */
727  if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
728  p->buf[2] == 'V' && (p->buf[3] == 'f' || p->buf[3] == 's'))
729  return AVPROBE_SCORE_MAX;
730  /* XXX: do streamed files always start at chunk boundary ?? */
731  /* or do we need to search NSVs in the byte stream ? */
732  /* seems the servers don't bother starting clean chunks... */
733  /* sometimes even the first header is at 9KB or something :^) */
734  for (i = 1; i < p->buf_size - 3; i++) {
735  if (p->buf[i+0] == 'N' && p->buf[i+1] == 'S' &&
736  p->buf[i+2] == 'V' && p->buf[i+3] == 's') {
737  score = AVPROBE_SCORE_MAX/5;
738  /* Get the chunk size and check if at the end we are getting 0xBEEF */
739  auxcount = p->buf[i+19];
740  vsize = p->buf[i+20] | p->buf[i+21] << 8;
741  asize = p->buf[i+22] | p->buf[i+23] << 8;
742  vsize = (vsize << 4) | (auxcount >> 4);
743  if ((asize + vsize + i + 23) < p->buf_size - 2) {
744  if (p->buf[i+23+asize+vsize+1] == 0xEF &&
745  p->buf[i+23+asize+vsize+2] == 0xBE)
746  return AVPROBE_SCORE_MAX-20;
747  }
748  }
749  }
750  /* so we'll have more luck on extension... */
751  if (av_match_ext(p->filename, "nsv"))
753  /* FIXME: add mime-type check */
754  return score;
755 }
756 
758  .name = "nsv",
759  .long_name = NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"),
760  .priv_data_size = sizeof(NSVContext),
766 };
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:68
int size
void av_free_packet(AVPacket *pkt)
Free a packet.
Definition: avpacket.c:243
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:1160
static const AVCodecTag nsv_codec_video_tags[]
Definition: nsvdec.c:185
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:1922
static int nsv_parse_NSVf_header(AVFormatContext *s)
Definition: nsvdec.c:269
uint32_t * nsvs_file_offset
Definition: nsvdec.c:171
uint16_t vheight
Definition: nsvdec.c:178
const char * filename
Definition: avformat.h:396
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:2800
uint32_t * nsvs_timestamps
Definition: nsvdec.c:181
int64_t pos
Definition: avformat.h:660
#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
int rate
Definition: nsvdec.c:160
int num
numerator
Definition: rational.h:44
int index
stream index in AVFormatContext
Definition: avformat.h:700
int size
Definition: avcodec.h:968
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:186
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:878
void * priv_data
Definition: avformat.h:719
int sample_size
Definition: nsvdec.c:161
av_dlog(ac->avr,"%d samples - audio_convert: %s to %s (%s)\n", 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)
#define NSV_MAX_RESYNC
Definition: nsvdec.c:33
static int64_t duration
Definition: avplay.c:246
static const AVCodecTag nsv_codec_audio_tags[]
Definition: nsvdec.c:204
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:198
Format I/O context.
Definition: avformat.h:922
Public dictionary API.
#define NSV_MAX_RESYNC_TRIES
Definition: nsvdec.c:34
#define NSV_ST_AUDIO
Definition: nsvdec.c:142
uint8_t
enum AVStreamParseType need_parsing
Definition: avformat.h:867
int id
Format-specific stream ID.
Definition: avformat.h:706
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:2497
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:990
int new_frame_offset
Definition: nsvdec.c:164
uint8_t * data
Definition: avcodec.h:967
static int flags
Definition: log.c:44
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:224
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:219
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2501
static int nsv_read_close(AVFormatContext *s)
Definition: nsvdec.c:705
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:452
#define NSV_ST_VIDEO
Definition: nsvdec.c:141
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1013
static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: nsvdec.c:658
int64_t duration
Definition: nsvdec.c:176
#define AVINDEX_KEYFRAME
Definition: avformat.h:662
AVPacket ahead[2]
Definition: nsvdec.c:174
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1130
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:186
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:1201
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:564
#define AVERROR(e)
Definition: error.h:43
int64_t timestamp
Definition: avformat.h:661
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:150
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:379
AVRational framerate
Definition: nsvdec.c:180
static int nsv_read_chunk(AVFormatContext *s, int fill_header)
Definition: nsvdec.c:531
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:973
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:443
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:718
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:398
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:397
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:978
AVInputFormat ff_nsv_demuxer
Definition: nsvdec.c:757
static int nsv_parse_NSVs_header(AVFormatContext *s)
Definition: nsvdec.c:378
int scale
Definition: nsvdec.c:159
char filename[1024]
input or output filename
Definition: avformat.h:998
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:116
static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: nsvdec.c:686
#define FFMIN(a, b)
Definition: common.h:57
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
int width
picture width / height.
Definition: avcodec.h:1218
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:210
uint32_t vtag
Definition: nsvdec.c:177
static int nsv_probe(AVProbeData *p)
Definition: nsvdec.c:718
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:544
Stream structure.
Definition: avformat.h:699
NULL
Definition: eval.c:55
enum AVMediaType codec_type
Definition: avcodec.h:1052
enum AVCodecID codec_id
Definition: avcodec.h:1061
int sample_rate
samples per second
Definition: avcodec.h:1785
AVIOContext * pb
I/O context.
Definition: avformat.h:964
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1076
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:402
This structure contains the data a format has to probe a file.
Definition: avformat.h:395
static int nsv_read_header(AVFormatContext *s)
Definition: nsvdec.c:495
static uint32_t state
Definition: trasher.c:27
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:756
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:404
full parsing and repack
Definition: avformat.h:653
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:548
Main libavformat public API header.
int cum_len
Definition: nsvdec.c:165
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:749
uint32_t atag
Definition: nsvdec.c:177
int den
denominator
Definition: rational.h:45
unsigned bps
Definition: movenc.c:845
#define MKBETAG(a, b, c, d)
Definition: common.h:239
int index_entries
Definition: nsvdec.c:172
int eof_reached
true if eof reached
Definition: avio.h:96
int channels
number of audio channels
Definition: avcodec.h:1786
void * priv_data
Format private data.
Definition: avformat.h:950
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:966
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:525
int16_t avsync
Definition: nsvdec.c:179
int stream_index
Definition: avcodec.h:969
#define MKTAG(a, b, c, d)
Definition: common.h:238
#define print_tag(str, tag, size)
Definition: nsvdec.c:216
This structure stores compressed data.
Definition: avcodec.h:944
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:205
#define av_unused
Definition: attributes.h:86