FFmpeg  4.0
nsvdec.c
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1 /*
2  * NSV demuxer
3  * Copyright (c) 2004 The FFmpeg Project
4  *
5  * first version by Francois Revol <revol@free.fr>
6  *
7  * This file is part of FFmpeg.
8  *
9  * FFmpeg is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * FFmpeg is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with FFmpeg; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22  */
23 
24 #include "libavutil/attributes.h"
25 #include "libavutil/mathematics.h"
26 #include "avformat.h"
27 #include "internal.h"
28 #include "libavutil/dict.h"
29 #include "libavutil/intreadwrite.h"
30 
31 /* max bytes to crawl for trying to resync
32  * stupid streaming servers don't start at chunk boundaries...
33  */
34 #define NSV_MAX_RESYNC (500*1024)
35 #define NSV_MAX_RESYNC_TRIES 300
36 
37 /*
38  * References:
39  * (1) http://www.multimedia.cx/nsv-format.txt
40  * seems someone came to the same conclusions as me, and updated it:
41  * (2) http://www.stud.ktu.lt/~vitslav/nsv/nsv-format.txt
42  * http://www.stud.ktu.lt/~vitslav/nsv/
43  * official docs
44  * (3) http://ultravox.aol.com/NSVFormat.rtf
45  * Sample files:
46  * (S1) http://www.nullsoft.com/nsv/samples/
47  * http://www.nullsoft.com/nsv/samples/faster.nsv
48  * http://streamripper.sourceforge.net/openbb/read.php?TID=492&page=4
49  */
50 
51 /*
52  * notes on the header (Francois Revol):
53  *
54  * It is followed by strings, then a table, but nothing tells
55  * where the table begins according to (1). After checking faster.nsv,
56  * I believe NVSf[16-19] gives the size of the strings data
57  * (that is the offset of the data table after the header).
58  * After checking all samples from (S1) all confirms this.
59  *
60  * Then, about NSVf[12-15], faster.nsf has 179700. When viewing it in VLC,
61  * I noticed there was about 1 NVSs chunk/s, so I ran
62  * strings faster.nsv | grep NSVs | wc -l
63  * which gave me 180. That leads me to think that NSVf[12-15] might be the
64  * file length in milliseconds.
65  * Let's try that:
66  * for f in *.nsv; do HTIME="$(od -t x4 "$f" | head -1 | sed 's/.* //')"; echo "'$f' $((0x$HTIME))s = $((0x$HTIME/1000/60)):$((0x$HTIME/1000%60))"; done
67  * except for nsvtrailer (which doesn't have an NSVf header), it reports correct time.
68  *
69  * nsvtrailer.nsv (S1) does not have any NSVf header, only NSVs chunks,
70  * so the header seems to not be mandatory. (for streaming).
71  *
72  * index slice duration check (excepts nsvtrailer.nsv):
73  * for f in [^n]*.nsv; do DUR="$(ffmpeg -i "$f" 2>/dev/null | grep 'NSVf duration' | cut -d ' ' -f 4)"; IC="$(ffmpeg -i "$f" 2>/dev/null | grep 'INDEX ENTRIES' | cut -d ' ' -f 2)"; echo "duration $DUR, slite time $(($DUR/$IC))"; done
74  */
75 
76 /*
77  * TODO:
78  * - handle timestamps !!!
79  * - use index
80  * - mime-type in probe()
81  * - seek
82  */
83 
84 #if 0
85 struct NSVf_header {
86  uint32_t chunk_tag; /* 'NSVf' */
87  uint32_t chunk_size;
88  uint32_t file_size; /* max 4GB ??? no one learns anything it seems :^) */
89  uint32_t file_length; //unknown1; /* what about MSB of file_size ? */
90  uint32_t info_strings_size; /* size of the info strings */ //unknown2;
91  uint32_t table_entries;
92  uint32_t table_entries_used; /* the left ones should be -1 */
93 };
94 
95 struct NSVs_header {
96  uint32_t chunk_tag; /* 'NSVs' */
97  uint32_t v4cc; /* or 'NONE' */
98  uint32_t a4cc; /* or 'NONE' */
99  uint16_t vwidth; /* av_assert0(vwidth%16==0) */
100  uint16_t vheight; /* av_assert0(vheight%16==0) */
101  uint8_t framerate; /* value = (framerate&0x80)?frtable[frameratex0x7f]:framerate */
102  uint16_t unknown;
103 };
104 
105 struct nsv_avchunk_header {
106  uint8_t vchunk_size_lsb;
107  uint16_t vchunk_size_msb; /* value = (vchunk_size_msb << 4) | (vchunk_size_lsb >> 4) */
108  uint16_t achunk_size;
109 };
110 
111 struct nsv_pcm_header {
112  uint8_t bits_per_sample;
113  uint8_t channel_count;
114  uint16_t sample_rate;
115 };
116 #endif
117 
118 /* variation from avi.h */
119 /*typedef struct CodecTag {
120  int id;
121  unsigned int tag;
122 } CodecTag;*/
123 
124 /* tags */
125 
126 #define T_NSVF MKTAG('N', 'S', 'V', 'f') /* file header */
127 #define T_NSVS MKTAG('N', 'S', 'V', 's') /* chunk header */
128 #define T_TOC2 MKTAG('T', 'O', 'C', '2') /* extra index marker */
129 #define T_NONE MKTAG('N', 'O', 'N', 'E') /* null a/v 4CC */
130 #define T_SUBT MKTAG('S', 'U', 'B', 'T') /* subtitle aux data */
131 #define T_ASYN MKTAG('A', 'S', 'Y', 'N') /* async a/v aux marker */
132 #define T_KEYF MKTAG('K', 'E', 'Y', 'F') /* video keyframe aux marker (addition) */
133 
134 #define TB_NSVF MKBETAG('N', 'S', 'V', 'f')
135 #define TB_NSVS MKBETAG('N', 'S', 'V', 's')
136 
137 /* hardcoded stream indexes */
138 #define NSV_ST_VIDEO 0
139 #define NSV_ST_AUDIO 1
140 #define NSV_ST_SUBT 2
141 
142 enum NSVStatus {
151 };
152 
153 typedef struct NSVStream {
154  int frame_offset; /* current frame (video) or byte (audio) counter
155  (used to compute the pts) */
156  int scale;
157  int rate;
158  int sample_size; /* audio only data */
159  int start;
160 
161  int new_frame_offset; /* temporary storage (used during seek) */
162  int cum_len; /* temporary storage (used during seek) */
163 } NSVStream;
164 
165 typedef struct NSVContext {
167  int NSVf_end;
168  uint32_t *nsvs_file_offset;
171  AVPacket ahead[2]; /* [v, a] if .data is !NULL there is something */
172  /* cached */
173  int64_t duration;
174  uint32_t vtag, atag;
175  uint16_t vwidth, vheight;
176  int16_t avsync;
178  uint32_t *nsvs_timestamps;
179 } NSVContext;
180 
182  { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
183  { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
184  { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
185  { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') },
186  { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
187  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
188  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
189  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
190  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
191  { AV_CODEC_ID_VP8, MKTAG('V', 'P', '8', '0') },
192 /*
193  { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
194  { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
195 */
196  { AV_CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
197  { AV_CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
198  { AV_CODEC_ID_NONE, 0 },
199 };
200 
202  { AV_CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') },
203  { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') },
204  { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') },
205  { AV_CODEC_ID_AAC, MKTAG('V', 'L', 'B', ' ') },
206  { AV_CODEC_ID_SPEEX, MKTAG('S', 'P', 'X', ' ') },
207  { AV_CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
208  { AV_CODEC_ID_NONE, 0 },
209 };
210 
211 //static int nsv_load_index(AVFormatContext *s);
212 static int nsv_read_chunk(AVFormatContext *s, int fill_header);
213 
214 /* try to find something we recognize, and set the state accordingly */
216 {
217  NSVContext *nsv = s->priv_data;
218  AVIOContext *pb = s->pb;
219  uint32_t v = 0;
220  int i;
221 
222  for (i = 0; i < NSV_MAX_RESYNC; i++) {
223  if (avio_feof(pb)) {
224  av_log(s, AV_LOG_TRACE, "NSV EOF\n");
225  nsv->state = NSV_UNSYNC;
226  return -1;
227  }
228  v <<= 8;
229  v |= avio_r8(pb);
230  if (i < 8) {
231  av_log(s, AV_LOG_TRACE, "NSV resync: [%d] = %02"PRIx32"\n", i, v & 0x0FF);
232  }
233 
234  if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
235  av_log(s, AV_LOG_TRACE, "NSV resynced on BEEF after %d bytes\n", i+1);
236  nsv->state = NSV_FOUND_BEEF;
237  return 0;
238  }
239  /* we read as big-endian, thus the MK*BE* */
240  if (v == TB_NSVF) { /* NSVf */
241  av_log(s, AV_LOG_TRACE, "NSV resynced on NSVf after %d bytes\n", i+1);
242  nsv->state = NSV_FOUND_NSVF;
243  return 0;
244  }
245  if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
246  av_log(s, AV_LOG_TRACE, "NSV resynced on NSVs after %d bytes\n", i+1);
247  nsv->state = NSV_FOUND_NSVS;
248  return 0;
249  }
250 
251  }
252  av_log(s, AV_LOG_TRACE, "NSV sync lost\n");
253  return -1;
254 }
255 
257 {
258  NSVContext *nsv = s->priv_data;
259  AVIOContext *pb = s->pb;
260  unsigned int av_unused file_size;
261  unsigned int size;
262  int64_t duration;
263  int strings_size;
264  int table_entries;
265  int table_entries_used;
266 
267  nsv->state = NSV_UNSYNC; /* in case we fail */
268 
269  size = avio_rl32(pb);
270  if (size < 28)
271  return -1;
272  nsv->NSVf_end = size;
273 
274  file_size = (uint32_t)avio_rl32(pb);
275  av_log(s, AV_LOG_TRACE, "NSV NSVf chunk_size %u\n", size);
276  av_log(s, AV_LOG_TRACE, "NSV NSVf file_size %u\n", file_size);
277 
278  nsv->duration = duration = avio_rl32(pb); /* in ms */
279  av_log(s, AV_LOG_TRACE, "NSV NSVf duration %"PRId64" ms\n", duration);
280  // XXX: store it in AVStreams
281 
282  strings_size = avio_rl32(pb);
283  table_entries = avio_rl32(pb);
284  table_entries_used = avio_rl32(pb);
285  av_log(s, AV_LOG_TRACE, "NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
286  strings_size, table_entries, table_entries_used);
287  if (avio_feof(pb))
288  return -1;
289 
290  av_log(s, AV_LOG_TRACE, "NSV got header; filepos %"PRId64"\n", avio_tell(pb));
291 
292  if (strings_size > 0) {
293  char *strings; /* last byte will be '\0' to play safe with str*() */
294  char *p, *endp;
295  char *token, *value;
296  char quote;
297 
298  p = strings = av_mallocz((size_t)strings_size + 1);
299  if (!p)
300  return AVERROR(ENOMEM);
301  endp = strings + strings_size;
302  avio_read(pb, strings, strings_size);
303  while (p < endp) {
304  while (*p == ' ')
305  p++; /* strip out spaces */
306  if (p >= endp-2)
307  break;
308  token = p;
309  p = strchr(p, '=');
310  if (!p || p >= endp-2)
311  break;
312  *p++ = '\0';
313  quote = *p++;
314  value = p;
315  p = strchr(p, quote);
316  if (!p || p >= endp)
317  break;
318  *p++ = '\0';
319  av_log(s, AV_LOG_TRACE, "NSV NSVf INFO: %s='%s'\n", token, value);
320  av_dict_set(&s->metadata, token, value, 0);
321  }
322  av_free(strings);
323  }
324  if (avio_feof(pb))
325  return -1;
326 
327  av_log(s, AV_LOG_TRACE, "NSV got infos; filepos %"PRId64"\n", avio_tell(pb));
328 
329  if (table_entries_used > 0) {
330  int i;
331  nsv->index_entries = table_entries_used;
332  if((unsigned)table_entries_used >= UINT_MAX / sizeof(uint32_t))
333  return -1;
334  nsv->nsvs_file_offset = av_malloc_array((unsigned)table_entries_used, sizeof(uint32_t));
335  if (!nsv->nsvs_file_offset)
336  return AVERROR(ENOMEM);
337 
338  for(i=0;i<table_entries_used;i++) {
339  if (avio_feof(pb))
340  return AVERROR_INVALIDDATA;
341  nsv->nsvs_file_offset[i] = avio_rl32(pb) + size;
342  }
343 
344  if(table_entries > table_entries_used &&
345  avio_rl32(pb) == MKTAG('T','O','C','2')) {
346  nsv->nsvs_timestamps = av_malloc_array((unsigned)table_entries_used, sizeof(uint32_t));
347  if (!nsv->nsvs_timestamps)
348  return AVERROR(ENOMEM);
349  for(i=0;i<table_entries_used;i++) {
350  nsv->nsvs_timestamps[i] = avio_rl32(pb);
351  }
352  }
353  }
354 
355  av_log(s, AV_LOG_TRACE, "NSV got index; filepos %"PRId64"\n", avio_tell(pb));
356 
357  avio_seek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
358 
359  if (avio_feof(pb))
360  return -1;
361  nsv->state = NSV_HAS_READ_NSVF;
362  return 0;
363 }
364 
366 {
367  NSVContext *nsv = s->priv_data;
368  AVIOContext *pb = s->pb;
369  uint32_t vtag, atag;
370  uint16_t vwidth, vheight;
371  AVRational framerate;
372  int i;
373  AVStream *st;
374  NSVStream *nst;
375 
376  vtag = avio_rl32(pb);
377  atag = avio_rl32(pb);
378  vwidth = avio_rl16(pb);
379  vheight = avio_rl16(pb);
380  i = avio_r8(pb);
381 
382  av_log(s, AV_LOG_TRACE, "NSV NSVs framerate code %2x\n", i);
383  if(i&0x80) { /* odd way of giving native framerates from docs */
384  int t=(i & 0x7F)>>2;
385  if(t<16) framerate = (AVRational){1, t+1};
386  else framerate = (AVRational){t-15, 1};
387 
388  if(i&1){
389  framerate.num *= 1000;
390  framerate.den *= 1001;
391  }
392 
393  if((i&3)==3) framerate.num *= 24;
394  else if((i&3)==2) framerate.num *= 25;
395  else framerate.num *= 30;
396  }
397  else
398  framerate= (AVRational){i, 1};
399 
400  nsv->avsync = avio_rl16(pb);
401  nsv->framerate = framerate;
402 
403  av_log(s, AV_LOG_TRACE, "NSV NSVs vsize %dx%d\n", vwidth, vheight);
404 
405  /* XXX change to ap != NULL ? */
406  if (s->nb_streams == 0) { /* streams not yet published, let's do that */
407  nsv->vtag = vtag;
408  nsv->atag = atag;
409  nsv->vwidth = vwidth;
410  nsv->vheight = vwidth;
411  if (vtag != T_NONE) {
412  int i;
413  st = avformat_new_stream(s, NULL);
414  if (!st)
415  goto fail;
416 
417  st->id = NSV_ST_VIDEO;
418  nst = av_mallocz(sizeof(NSVStream));
419  if (!nst)
420  goto fail;
421  st->priv_data = nst;
423  st->codecpar->codec_tag = vtag;
424  st->codecpar->codec_id = ff_codec_get_id(nsv_codec_video_tags, vtag);
425  st->codecpar->width = vwidth;
426  st->codecpar->height = vheight;
427  st->codecpar->bits_per_coded_sample = 24; /* depth XXX */
428 
429  avpriv_set_pts_info(st, 64, framerate.den, framerate.num);
430  st->start_time = 0;
431  st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
432 
433  for(i=0;i<nsv->index_entries;i++) {
434  if(nsv->nsvs_timestamps) {
436  0, 0, AVINDEX_KEYFRAME);
437  } else {
438  int64_t ts = av_rescale(i*nsv->duration/nsv->index_entries, framerate.num, 1000*framerate.den);
439  av_add_index_entry(st, nsv->nsvs_file_offset[i], ts, 0, 0, AVINDEX_KEYFRAME);
440  }
441  }
442  }
443  if (atag != T_NONE) {
444  st = avformat_new_stream(s, NULL);
445  if (!st)
446  goto fail;
447 
448  st->id = NSV_ST_AUDIO;
449  nst = av_mallocz(sizeof(NSVStream));
450  if (!nst)
451  goto fail;
452  st->priv_data = nst;
454  st->codecpar->codec_tag = atag;
455  st->codecpar->codec_id = ff_codec_get_id(nsv_codec_audio_tags, atag);
456 
457  st->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */
458 
459  /* set timebase to common denominator of ms and framerate */
460  avpriv_set_pts_info(st, 64, 1, framerate.num*1000);
461  st->start_time = 0;
462  st->duration = (int64_t)nsv->duration * framerate.num;
463  }
464  } else {
465  if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
466  av_log(s, AV_LOG_TRACE, "NSV NSVs header values differ from the first one!!!\n");
467  //return -1;
468  }
469  }
470 
471  nsv->state = NSV_HAS_READ_NSVS;
472  return 0;
473 fail:
474  /* XXX */
475  nsv->state = NSV_UNSYNC;
476  return -1;
477 }
478 
480 {
481  NSVContext *nsv = s->priv_data;
482  int i, err;
483 
484  nsv->state = NSV_UNSYNC;
485  nsv->ahead[0].data = nsv->ahead[1].data = NULL;
486 
487  for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
488  if (nsv_resync(s) < 0)
489  return -1;
490  if (nsv->state == NSV_FOUND_NSVF) {
491  err = nsv_parse_NSVf_header(s);
492  if (err < 0)
493  return err;
494  }
495  /* we need the first NSVs also... */
496  if (nsv->state == NSV_FOUND_NSVS) {
497  err = nsv_parse_NSVs_header(s);
498  if (err < 0)
499  return err;
500  break; /* we just want the first one */
501  }
502  }
503  if (s->nb_streams < 1) /* no luck so far */
504  return -1;
505  /* now read the first chunk, so we can attempt to decode more info */
506  err = nsv_read_chunk(s, 1);
507 
508  av_log(s, AV_LOG_TRACE, "parsed header\n");
509  return err;
510 }
511 
512 static int nsv_read_chunk(AVFormatContext *s, int fill_header)
513 {
514  NSVContext *nsv = s->priv_data;
515  AVIOContext *pb = s->pb;
516  AVStream *st[2] = {NULL, NULL};
517  NSVStream *nst;
518  AVPacket *pkt;
519  int i, err = 0;
520  uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
521  uint32_t vsize;
522  uint16_t asize;
523  uint16_t auxsize;
524  int ret;
525 
526  if (nsv->ahead[0].data || nsv->ahead[1].data)
527  return 0; //-1; /* hey! eat what you've in your plate first! */
528 
529 null_chunk_retry:
530  if (avio_feof(pb))
531  return -1;
532 
533  for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
534  err = nsv_resync(s);
535  if (err < 0)
536  return err;
537  if (nsv->state == NSV_FOUND_NSVS)
538  err = nsv_parse_NSVs_header(s);
539  if (err < 0)
540  return err;
541  if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
542  return -1;
543 
544  auxcount = avio_r8(pb);
545  vsize = avio_rl16(pb);
546  asize = avio_rl16(pb);
547  vsize = (vsize << 4) | (auxcount >> 4);
548  auxcount &= 0x0f;
549  av_log(s, AV_LOG_TRACE, "NSV CHUNK %d aux, %"PRIu32" bytes video, %d bytes audio\n", auxcount, vsize, asize);
550  /* skip aux stuff */
551  for (i = 0; i < auxcount; i++) {
552  uint32_t av_unused auxtag;
553  auxsize = avio_rl16(pb);
554  auxtag = avio_rl32(pb);
555  avio_skip(pb, auxsize);
556  vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming brain-dead */
557  }
558 
559  if (avio_feof(pb))
560  return -1;
561  if (!vsize && !asize) {
562  nsv->state = NSV_UNSYNC;
563  goto null_chunk_retry;
564  }
565 
566  /* map back streams to v,a */
567  if (s->nb_streams > 0)
568  st[s->streams[0]->id] = s->streams[0];
569  if (s->nb_streams > 1)
570  st[s->streams[1]->id] = s->streams[1];
571 
572  if (vsize && st[NSV_ST_VIDEO]) {
573  nst = st[NSV_ST_VIDEO]->priv_data;
574  pkt = &nsv->ahead[NSV_ST_VIDEO];
575  if ((ret = av_get_packet(pb, pkt, vsize)) < 0)
576  return ret;
577  pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
578  pkt->dts = nst->frame_offset;
579  pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
580  for (i = 0; i < FFMIN(8, vsize); i++)
581  av_log(s, AV_LOG_TRACE, "NSV video: [%d] = %02x\n", i, pkt->data[i]);
582  }
583  if(st[NSV_ST_VIDEO])
584  ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++;
585 
586  if (asize && st[NSV_ST_AUDIO]) {
587  nst = st[NSV_ST_AUDIO]->priv_data;
588  pkt = &nsv->ahead[NSV_ST_AUDIO];
589  /* read raw audio specific header on the first audio chunk... */
590  /* on ALL audio chunks ?? seems so! */
591  if (asize && st[NSV_ST_AUDIO]->codecpar->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
592  uint8_t bps;
594  uint16_t samplerate;
595  bps = avio_r8(pb);
596  channels = avio_r8(pb);
597  samplerate = avio_rl16(pb);
598  if (!channels || !samplerate)
599  return AVERROR_INVALIDDATA;
600  asize-=4;
601  av_log(s, AV_LOG_TRACE, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
602  if (fill_header) {
603  st[NSV_ST_AUDIO]->need_parsing = AVSTREAM_PARSE_NONE; /* we know everything */
604  if (bps != 16) {
605  av_log(s, AV_LOG_TRACE, "NSV AUDIO bit/sample != 16 (%d)!!!\n", bps);
606  }
607  bps /= channels; // ???
608  if (bps == 8)
610  samplerate /= 4;/* UGH ??? XXX */
611  channels = 1;
613  st[NSV_ST_AUDIO]->codecpar->sample_rate = samplerate;
614  av_log(s, AV_LOG_TRACE, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
615  }
616  }
617  if ((ret = av_get_packet(pb, pkt, asize)) < 0)
618  return ret;
619  pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
620  pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
621  if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) {
622  /* on a nsvs frame we have new information on a/v sync */
623  pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1);
624  pkt->dts *= (int64_t)1000 * nsv->framerate.den;
625  pkt->dts += (int64_t)nsv->avsync * nsv->framerate.num;
626  av_log(s, AV_LOG_TRACE, "NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts);
627  }
628  nst->frame_offset++;
629  }
630 
631  nsv->state = NSV_UNSYNC;
632  return 0;
633 }
634 
635 
637 {
638  NSVContext *nsv = s->priv_data;
639  int i, err = 0;
640 
641  /* in case we don't already have something to eat ... */
642  if (!nsv->ahead[0].data && !nsv->ahead[1].data)
643  err = nsv_read_chunk(s, 0);
644  if (err < 0)
645  return err;
646 
647  /* now pick one of the plates */
648  for (i = 0; i < 2; i++) {
649  if (nsv->ahead[i].data) {
650  /* avoid the cost of new_packet + memcpy(->data) */
651  memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket));
652  nsv->ahead[i].data = NULL; /* we ate that one */
653  return pkt->size;
654  }
655  }
656 
657  /* this restaurant is not provisioned :^] */
658  return -1;
659 }
660 
661 static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
662 {
663  NSVContext *nsv = s->priv_data;
664  AVStream *st = s->streams[stream_index];
665  NSVStream *nst = st->priv_data;
666  int index;
667 
668  index = av_index_search_timestamp(st, timestamp, flags);
669  if(index < 0)
670  return -1;
671 
672  if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
673  return -1;
674 
676  nsv->state = NSV_UNSYNC;
677  return 0;
678 }
679 
681 {
682  NSVContext *nsv = s->priv_data;
683 
684  av_freep(&nsv->nsvs_file_offset);
685  av_freep(&nsv->nsvs_timestamps);
686  if (nsv->ahead[0].data)
687  av_packet_unref(&nsv->ahead[0]);
688  if (nsv->ahead[1].data)
689  av_packet_unref(&nsv->ahead[1]);
690  return 0;
691 }
692 
693 static int nsv_probe(AVProbeData *p)
694 {
695  int i, score = 0;
696 
697  /* check file header */
698  /* streamed files might not have any header */
699  if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
700  p->buf[2] == 'V' && (p->buf[3] == 'f' || p->buf[3] == 's'))
701  return AVPROBE_SCORE_MAX;
702  /* XXX: do streamed files always start at chunk boundary ?? */
703  /* or do we need to search NSVs in the byte stream ? */
704  /* seems the servers don't bother starting clean chunks... */
705  /* sometimes even the first header is at 9KB or something :^) */
706  for (i = 1; i < p->buf_size - 3; i++) {
707  if (AV_RL32(p->buf + i) == AV_RL32("NSVs")) {
708  /* Get the chunk size and check if at the end we are getting 0xBEEF */
709  int vsize = AV_RL24(p->buf+i+19) >> 4;
710  int asize = AV_RL16(p->buf+i+22);
711  int offset = i + 23 + asize + vsize + 1;
712  if (offset <= p->buf_size - 2 && AV_RL16(p->buf + offset) == 0xBEEF)
713  return 4*AVPROBE_SCORE_MAX/5;
714  score = AVPROBE_SCORE_MAX/5;
715  }
716  }
717  /* so we'll have more luck on extension... */
718  if (av_match_ext(p->filename, "nsv"))
720  /* FIXME: add mime-type check */
721  return score;
722 }
723 
725  .name = "nsv",
726  .long_name = NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"),
727  .priv_data_size = sizeof(NSVContext),
733 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
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:2038
static const AVCodecTag nsv_codec_video_tags[]
Definition: nsvdec.c:181
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3108
static int nsv_parse_NSVf_header(AVFormatContext *s)
Definition: nsvdec.c:256
uint32_t * nsvs_file_offset
Definition: nsvdec.c:168
uint16_t vheight
Definition: nsvdec.c:175
const char * filename
Definition: avformat.h:449
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:4811
uint32_t * nsvs_timestamps
Definition: nsvdec.c:178
int64_t pos
Definition: avformat.h:803
#define TB_NSVF
Definition: nsvdec.c:134
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
channels
Definition: aptx.c:30
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3884
int rate
Definition: nsvdec.c:157
int num
Numerator.
Definition: rational.h:59
int index
stream index in AVFormatContext
Definition: avformat.h:874
int size
Definition: avcodec.h:1431
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1102
#define AV_RL16
Definition: intreadwrite.h:42
void * priv_data
Definition: avformat.h:888
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:331
int sample_size
Definition: nsvdec.c:158
static AVPacket pkt
#define NSV_MAX_RESYNC
Definition: nsvdec.c:34
static const AVCodecTag nsv_codec_audio_tags[]
Definition: nsvdec.c:201
Macro definitions for various function/variable attributes.
int base_offset
Definition: nsvdec.c:166
Format I/O context.
Definition: avformat.h:1342
Public dictionary API.
#define NSV_MAX_RESYNC_TRIES
Definition: nsvdec.c:35
#define NSV_ST_AUDIO
Definition: nsvdec.c:139
uint8_t
int width
Video only.
Definition: avcodec.h:3950
#define AV_LOG_TRACE
Extremely verbose debugging, useful for libav* development.
Definition: log.h:202
enum AVStreamParseType need_parsing
Definition: avformat.h:1091
int id
Format-specific stream ID.
Definition: avformat.h:880
int frame_offset
Definition: nsvdec.c:154
int NSVf_end
Definition: nsvdec.c:167
int start
Definition: nsvdec.c:159
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4441
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1410
int64_t duration
Definition: movenc.c:63
int new_frame_offset
Definition: nsvdec.c:161
uint8_t * data
Definition: avcodec.h:1430
static int flags
Definition: log.c:55
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:310
static int nsv_resync(AVFormatContext *s)
Definition: nsvdec.c:215
int av_match_ext(const char *filename, const char *extensions)
Return a positive value if the given filename has one of the given extensions, 0 otherwise.
Definition: format.c:38
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
static int nsv_read_close(AVFormatContext *s)
Definition: nsvdec.c:680
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:648
#define NSV_ST_VIDEO
Definition: nsvdec.c:138
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1462
static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: nsvdec.c:636
int64_t duration
Definition: nsvdec.c:173
#define AVINDEX_KEYFRAME
Definition: avformat.h:810
AVPacket ahead[2]
Definition: nsvdec.c:171
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1580
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2147
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:770
#define AVERROR(e)
Definition: error.h:43
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:804
uint16_t vwidth
Definition: nsvdec.c:175
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:552
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3880
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
AVRational framerate
Definition: nsvdec.c:177
#define fail()
Definition: checkasm.h:116
static int nsv_read_chunk(AVFormatContext *s, int fill_header)
Definition: nsvdec.c:512
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1436
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:639
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:451
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:450
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1398
AVInputFormat ff_nsv_demuxer
Definition: nsvdec.c:724
static int nsv_parse_NSVs_header(AVFormatContext *s)
Definition: nsvdec.c:365
int scale
Definition: nsvdec.c:156
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
Definition: mathematics.c:129
static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: nsvdec.c:661
#define FFMIN(a, b)
Definition: common.h:96
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
NSVStatus
Definition: nsvdec.c:142
uint32_t vtag
Definition: nsvdec.c:174
#define AV_RL32
Definition: intreadwrite.h:146
static struct @271 state
static int nsv_probe(AVProbeData *p)
Definition: nsvdec.c:693
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
Stream structure.
Definition: avformat.h:873
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
sample_rate
AVIOContext * pb
I/O context.
Definition: avformat.h:1384
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:592
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
double value
Definition: eval.c:98
#define T_NONE
Definition: nsvdec.c:129
int index
Definition: gxfenc.c:89
Rational number (pair of numerator and denominator).
Definition: rational.h:58
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:458
This structure contains the data a format has to probe a file.
Definition: avformat.h:448
static int nsv_read_header(AVFormatContext *s)
Definition: nsvdec.c:479
#define AV_RL24
Definition: intreadwrite.h:78
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:922
int sample_rate
Audio only.
Definition: avcodec.h:3994
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:460
full parsing and repack
Definition: avformat.h:793
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:754
Main libavformat public API header.
int cum_len
Definition: nsvdec.c:162
enum NSVStatus state
Definition: nsvdec.c:170
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:912
uint32_t atag
Definition: nsvdec.c:174
int den
Denominator.
Definition: rational.h:60
unsigned bps
Definition: movenc.c:1456
#define MKBETAG(a, b, c, d)
Definition: common.h:367
#define av_free(p)
int index_entries
Definition: nsvdec.c:169
void * priv_data
Format private data.
Definition: avformat.h:1370
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:3926
int channels
Audio only.
Definition: avcodec.h:3990
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1429
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:647
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1020
#define av_malloc_array(a, b)
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:358
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3888
int16_t avsync
Definition: nsvdec.c:176
int stream_index
Definition: avcodec.h:1432
#define MKTAG(a, b, c, d)
Definition: common.h:366
This structure stores compressed data.
Definition: avcodec.h:1407
#define av_unused
Definition: attributes.h:125