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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 veiwing 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 nstrailer (which doesn't have an NSVf header), it repports 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  //DVDemuxContext* dv_demux;
180 } NSVContext;
181 
183  { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
184  { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
185  { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
186  { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') },
187  { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
188  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
189  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
190  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
191  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
192  { AV_CODEC_ID_VP8, MKTAG('V', 'P', '8', '0') },
193 /*
194  { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
195  { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
196 */
197  { AV_CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
198  { AV_CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
199  { AV_CODEC_ID_NONE, 0 },
200 };
201 
203  { AV_CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') },
204  { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') },
205  { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') },
206  { AV_CODEC_ID_AAC, MKTAG('V', 'L', 'B', ' ') },
207  { AV_CODEC_ID_SPEEX, MKTAG('S', 'P', 'X', ' ') },
208  { AV_CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
209  { AV_CODEC_ID_NONE, 0 },
210 };
211 
212 //static int nsv_load_index(AVFormatContext *s);
213 static int nsv_read_chunk(AVFormatContext *s, int fill_header);
214 
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  //nsv->state = NSV_UNSYNC;
233 
234  for (i = 0; i < NSV_MAX_RESYNC; i++) {
235  if (avio_feof(pb)) {
236  av_log(s, AV_LOG_TRACE, "NSV EOF\n");
237  nsv->state = NSV_UNSYNC;
238  return -1;
239  }
240  v <<= 8;
241  v |= avio_r8(pb);
242  if (i < 8) {
243  av_log(s, AV_LOG_TRACE, "NSV resync: [%d] = %02x\n", i, v & 0x0FF);
244  }
245 
246  if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
247  av_log(s, AV_LOG_TRACE, "NSV resynced on BEEF after %d bytes\n", i+1);
248  nsv->state = NSV_FOUND_BEEF;
249  return 0;
250  }
251  /* we read as big-endian, thus the MK*BE* */
252  if (v == TB_NSVF) { /* NSVf */
253  av_log(s, AV_LOG_TRACE, "NSV resynced on NSVf after %d bytes\n", i+1);
254  nsv->state = NSV_FOUND_NSVF;
255  return 0;
256  }
257  if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
258  av_log(s, AV_LOG_TRACE, "NSV resynced on NSVs after %d bytes\n", i+1);
259  nsv->state = NSV_FOUND_NSVS;
260  return 0;
261  }
262 
263  }
264  av_log(s, AV_LOG_TRACE, "NSV sync lost\n");
265  return -1;
266 }
267 
269 {
270  NSVContext *nsv = s->priv_data;
271  AVIOContext *pb = s->pb;
272  unsigned int av_unused file_size;
273  unsigned int size;
274  int64_t duration;
275  int strings_size;
276  int table_entries;
277  int table_entries_used;
278 
279  av_log(s, AV_LOG_TRACE, "%s()\n", __FUNCTION__);
280 
281  nsv->state = NSV_UNSYNC; /* in case we fail */
282 
283  size = avio_rl32(pb);
284  if (size < 28)
285  return -1;
286  nsv->NSVf_end = size;
287 
288  //s->file_size = (uint32_t)avio_rl32(pb);
289  file_size = (uint32_t)avio_rl32(pb);
290  av_log(s, AV_LOG_TRACE, "NSV NSVf chunk_size %u\n", size);
291  av_log(s, AV_LOG_TRACE, "NSV NSVf file_size %u\n", file_size);
292 
293  nsv->duration = duration = avio_rl32(pb); /* in ms */
294  av_log(s, AV_LOG_TRACE, "NSV NSVf duration %"PRId64" ms\n", duration);
295  // XXX: store it in AVStreams
296 
297  strings_size = avio_rl32(pb);
298  table_entries = avio_rl32(pb);
299  table_entries_used = avio_rl32(pb);
300  av_log(s, AV_LOG_TRACE, "NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
301  strings_size, table_entries, table_entries_used);
302  if (avio_feof(pb))
303  return -1;
304 
305  av_log(s, AV_LOG_TRACE, "NSV got header; filepos %"PRId64"\n", avio_tell(pb));
306 
307  if (strings_size > 0) {
308  char *strings; /* last byte will be '\0' to play safe with str*() */
309  char *p, *endp;
310  char *token, *value;
311  char quote;
312 
313  p = strings = av_mallocz((size_t)strings_size + 1);
314  if (!p)
315  return AVERROR(ENOMEM);
316  endp = strings + strings_size;
317  avio_read(pb, strings, strings_size);
318  while (p < endp) {
319  while (*p == ' ')
320  p++; /* strip out spaces */
321  if (p >= endp-2)
322  break;
323  token = p;
324  p = strchr(p, '=');
325  if (!p || p >= endp-2)
326  break;
327  *p++ = '\0';
328  quote = *p++;
329  value = p;
330  p = strchr(p, quote);
331  if (!p || p >= endp)
332  break;
333  *p++ = '\0';
334  av_log(s, AV_LOG_TRACE, "NSV NSVf INFO: %s='%s'\n", token, value);
335  av_dict_set(&s->metadata, token, value, 0);
336  }
337  av_free(strings);
338  }
339  if (avio_feof(pb))
340  return -1;
341 
342  av_log(s, AV_LOG_TRACE, "NSV got infos; filepos %"PRId64"\n", avio_tell(pb));
343 
344  if (table_entries_used > 0) {
345  int i;
346  nsv->index_entries = table_entries_used;
347  if((unsigned)table_entries_used >= UINT_MAX / sizeof(uint32_t))
348  return -1;
349  nsv->nsvs_file_offset = av_malloc_array((unsigned)table_entries_used, sizeof(uint32_t));
350  if (!nsv->nsvs_file_offset)
351  return AVERROR(ENOMEM);
352 
353  for(i=0;i<table_entries_used;i++)
354  nsv->nsvs_file_offset[i] = avio_rl32(pb) + size;
355 
356  if(table_entries > table_entries_used &&
357  avio_rl32(pb) == MKTAG('T','O','C','2')) {
358  nsv->nsvs_timestamps = av_malloc_array((unsigned)table_entries_used, sizeof(uint32_t));
359  if (!nsv->nsvs_timestamps)
360  return AVERROR(ENOMEM);
361  for(i=0;i<table_entries_used;i++) {
362  nsv->nsvs_timestamps[i] = avio_rl32(pb);
363  }
364  }
365  }
366 
367  av_log(s, AV_LOG_TRACE, "NSV got index; filepos %"PRId64"\n", avio_tell(pb));
368 
369  avio_seek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
370 
371  if (avio_feof(pb))
372  return -1;
373  nsv->state = NSV_HAS_READ_NSVF;
374  return 0;
375 }
376 
378 {
379  NSVContext *nsv = s->priv_data;
380  AVIOContext *pb = s->pb;
381  uint32_t vtag, atag;
382  uint16_t vwidth, vheight;
383  AVRational framerate;
384  int i;
385  AVStream *st;
386  NSVStream *nst;
387  av_log(s, AV_LOG_TRACE, "%s()\n", __FUNCTION__);
388 
389  vtag = avio_rl32(pb);
390  atag = avio_rl32(pb);
391  vwidth = avio_rl16(pb);
392  vheight = avio_rl16(pb);
393  i = avio_r8(pb);
394 
395  av_log(s, AV_LOG_TRACE, "NSV NSVs framerate code %2x\n", i);
396  if(i&0x80) { /* odd way of giving native framerates from docs */
397  int t=(i & 0x7F)>>2;
398  if(t<16) framerate = (AVRational){1, t+1};
399  else framerate = (AVRational){t-15, 1};
400 
401  if(i&1){
402  framerate.num *= 1000;
403  framerate.den *= 1001;
404  }
405 
406  if((i&3)==3) framerate.num *= 24;
407  else if((i&3)==2) framerate.num *= 25;
408  else framerate.num *= 30;
409  }
410  else
411  framerate= (AVRational){i, 1};
412 
413  nsv->avsync = avio_rl16(pb);
414  nsv->framerate = framerate;
415 
416  print_tag("NSV NSVs vtag", vtag, 0);
417  print_tag("NSV NSVs atag", atag, 0);
418  av_log(s, AV_LOG_TRACE, "NSV NSVs vsize %dx%d\n", vwidth, vheight);
419 
420  /* XXX change to ap != NULL ? */
421  if (s->nb_streams == 0) { /* streams not yet published, let's do that */
422  nsv->vtag = vtag;
423  nsv->atag = atag;
424  nsv->vwidth = vwidth;
425  nsv->vheight = vwidth;
426  if (vtag != T_NONE) {
427  int i;
428  st = avformat_new_stream(s, NULL);
429  if (!st)
430  goto fail;
431 
432  st->id = NSV_ST_VIDEO;
433  nst = av_mallocz(sizeof(NSVStream));
434  if (!nst)
435  goto fail;
436  st->priv_data = nst;
438  st->codec->codec_tag = vtag;
439  st->codec->codec_id = ff_codec_get_id(nsv_codec_video_tags, vtag);
440  st->codec->width = vwidth;
441  st->codec->height = vheight;
442  st->codec->bits_per_coded_sample = 24; /* depth XXX */
443 
444  avpriv_set_pts_info(st, 64, framerate.den, framerate.num);
445  st->start_time = 0;
446  st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
447 
448  for(i=0;i<nsv->index_entries;i++) {
449  if(nsv->nsvs_timestamps) {
451  0, 0, AVINDEX_KEYFRAME);
452  } else {
453  int64_t ts = av_rescale(i*nsv->duration/nsv->index_entries, framerate.num, 1000*framerate.den);
454  av_add_index_entry(st, nsv->nsvs_file_offset[i], ts, 0, 0, AVINDEX_KEYFRAME);
455  }
456  }
457  }
458  if (atag != T_NONE) {
459  st = avformat_new_stream(s, NULL);
460  if (!st)
461  goto fail;
462 
463  st->id = NSV_ST_AUDIO;
464  nst = av_mallocz(sizeof(NSVStream));
465  if (!nst)
466  goto fail;
467  st->priv_data = nst;
469  st->codec->codec_tag = atag;
470  st->codec->codec_id = ff_codec_get_id(nsv_codec_audio_tags, atag);
471 
472  st->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */
473 
474  /* set timebase to common denominator of ms and framerate */
475  avpriv_set_pts_info(st, 64, 1, framerate.num*1000);
476  st->start_time = 0;
477  st->duration = (int64_t)nsv->duration * framerate.num;
478  }
479  } else {
480  if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
481  av_log(s, AV_LOG_TRACE, "NSV NSVs header values differ from the first one!!!\n");
482  //return -1;
483  }
484  }
485 
486  nsv->state = NSV_HAS_READ_NSVS;
487  return 0;
488 fail:
489  /* XXX */
490  nsv->state = NSV_UNSYNC;
491  return -1;
492 }
493 
495 {
496  NSVContext *nsv = s->priv_data;
497  int i, err;
498 
499  av_log(s, AV_LOG_TRACE, "%s()\n", __FUNCTION__);
500  av_log(s, AV_LOG_TRACE, "filename '%s'\n", s->filename);
501 
502  nsv->state = NSV_UNSYNC;
503  nsv->ahead[0].data = nsv->ahead[1].data = NULL;
504 
505  for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
506  if (nsv_resync(s) < 0)
507  return -1;
508  if (nsv->state == NSV_FOUND_NSVF) {
509  err = nsv_parse_NSVf_header(s);
510  if (err < 0)
511  return err;
512  }
513  /* we need the first NSVs also... */
514  if (nsv->state == NSV_FOUND_NSVS) {
515  err = nsv_parse_NSVs_header(s);
516  if (err < 0)
517  return err;
518  break; /* we just want the first one */
519  }
520  }
521  if (s->nb_streams < 1) /* no luck so far */
522  return -1;
523  /* now read the first chunk, so we can attempt to decode more info */
524  err = nsv_read_chunk(s, 1);
525 
526  av_log(s, AV_LOG_TRACE, "parsed header\n");
527  return err;
528 }
529 
530 static int nsv_read_chunk(AVFormatContext *s, int fill_header)
531 {
532  NSVContext *nsv = s->priv_data;
533  AVIOContext *pb = s->pb;
534  AVStream *st[2] = {NULL, NULL};
535  NSVStream *nst;
536  AVPacket *pkt;
537  int i, err = 0;
538  uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
539  uint32_t vsize;
540  uint16_t asize;
541  uint16_t auxsize;
542  int ret;
543 
544  av_log(s, AV_LOG_TRACE, "%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 (avio_feof(pb))
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_log(s, AV_LOG_TRACE, "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_log(s, AV_LOG_TRACE, "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 (avio_feof(pb))
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  if ((ret = av_get_packet(pb, pkt, vsize)) < 0)
602  return ret;
603  pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
604  pkt->dts = nst->frame_offset;
605  pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
606  for (i = 0; i < FFMIN(8, vsize); i++)
607  av_log(s, AV_LOG_TRACE, "NSV video: [%d] = %02x\n", i, pkt->data[i]);
608  }
609  if(st[NSV_ST_VIDEO])
610  ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++;
611 
612  if (asize && st[NSV_ST_AUDIO]) {
613  nst = st[NSV_ST_AUDIO]->priv_data;
614  pkt = &nsv->ahead[NSV_ST_AUDIO];
615  /* read raw audio specific header on the first audio chunk... */
616  /* on ALL audio chunks ?? seems so! */
617  if (asize && st[NSV_ST_AUDIO]->codec->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
618  uint8_t bps;
619  uint8_t channels;
620  uint16_t samplerate;
621  bps = avio_r8(pb);
622  channels = avio_r8(pb);
623  samplerate = avio_rl16(pb);
624  if (!channels || !samplerate)
625  return AVERROR_INVALIDDATA;
626  asize-=4;
627  av_log(s, AV_LOG_TRACE, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
628  if (fill_header) {
629  st[NSV_ST_AUDIO]->need_parsing = AVSTREAM_PARSE_NONE; /* we know everything */
630  if (bps != 16) {
631  av_log(s, AV_LOG_TRACE, "NSV AUDIO bit/sample != 16 (%d)!!!\n", bps);
632  }
633  bps /= channels; // ???
634  if (bps == 8)
636  samplerate /= 4;/* UGH ??? XXX */
637  channels = 1;
638  st[NSV_ST_AUDIO]->codec->channels = channels;
639  st[NSV_ST_AUDIO]->codec->sample_rate = samplerate;
640  av_log(s, AV_LOG_TRACE, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
641  }
642  }
643  if ((ret = av_get_packet(pb, pkt, asize)) < 0)
644  return ret;
645  pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
646  pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
647  if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) {
648  /* on a nsvs frame we have new information on a/v sync */
649  pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1);
650  pkt->dts *= (int64_t)1000 * nsv->framerate.den;
651  pkt->dts += (int64_t)nsv->avsync * nsv->framerate.num;
652  av_log(s, AV_LOG_TRACE, "NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts);
653  }
654  nst->frame_offset++;
655  }
656 
657  nsv->state = NSV_UNSYNC;
658  return 0;
659 }
660 
661 
663 {
664  NSVContext *nsv = s->priv_data;
665  int i, err = 0;
666 
667  av_log(s, AV_LOG_TRACE, "%s()\n", __FUNCTION__);
668 
669  /* in case we don't already have something to eat ... */
670  if (!nsv->ahead[0].data && !nsv->ahead[1].data)
671  err = nsv_read_chunk(s, 0);
672  if (err < 0)
673  return err;
674 
675  /* now pick one of the plates */
676  for (i = 0; i < 2; i++) {
677  if (nsv->ahead[i].data) {
678  av_log(s, AV_LOG_TRACE, "%s: using cached packet[%d]\n", __FUNCTION__, i);
679  /* avoid the cost of new_packet + memcpy(->data) */
680  memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket));
681  nsv->ahead[i].data = NULL; /* we ate that one */
682  return pkt->size;
683  }
684  }
685 
686  /* this restaurant is not approvisionned :^] */
687  return -1;
688 }
689 
690 static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
691 {
692  NSVContext *nsv = s->priv_data;
693  AVStream *st = s->streams[stream_index];
694  NSVStream *nst = st->priv_data;
695  int index;
696 
697  index = av_index_search_timestamp(st, timestamp, flags);
698  if(index < 0)
699  return -1;
700 
701  if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
702  return -1;
703 
705  nsv->state = NSV_UNSYNC;
706  return 0;
707 }
708 
710 {
711  NSVContext *nsv = s->priv_data;
712 
713  av_freep(&nsv->nsvs_file_offset);
714  av_freep(&nsv->nsvs_timestamps);
715  if (nsv->ahead[0].data)
716  av_free_packet(&nsv->ahead[0]);
717  if (nsv->ahead[1].data)
718  av_free_packet(&nsv->ahead[1]);
719  return 0;
720 }
721 
722 static int nsv_probe(AVProbeData *p)
723 {
724  int i, score = 0;
725 
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 (AV_RL32(p->buf + i) == AV_RL32("NSVs")) {
737  /* Get the chunk size and check if at the end we are getting 0xBEEF */
738  int vsize = AV_RL24(p->buf+i+19) >> 4;
739  int asize = AV_RL16(p->buf+i+22);
740  int offset = i + 23 + asize + vsize + 1;
741  if (offset <= p->buf_size - 2 && AV_RL16(p->buf + offset) == 0xBEEF)
742  return 4*AVPROBE_SCORE_MAX/5;
743  score = AVPROBE_SCORE_MAX/5;
744  }
745  }
746  /* so we'll have more luck on extension... */
747  if (av_match_ext(p->filename, "nsv"))
749  /* FIXME: add mime-type check */
750  return score;
751 }
752 
754  .name = "nsv",
755  .long_name = NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"),
756  .priv_data_size = sizeof(NSVContext),
762 };
#define NULL
Definition: coverity.c:32
float v
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:111
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
void av_free_packet(AVPacket *pkt)
Free a packet.
Definition: avpacket.c:280
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:1745
static const AVCodecTag nsv_codec_video_tags[]
Definition: nsvdec.c:182
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:2773
static int nsv_parse_NSVf_header(AVFormatContext *s)
Definition: nsvdec.c:268
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:4075
uint32_t * nsvs_timestamps
Definition: nsvdec.c:178
int64_t pos
Definition: avformat.h:784
#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
int rate
Definition: nsvdec.c:157
int num
numerator
Definition: rational.h:44
int index
stream index in AVFormatContext
Definition: avformat.h:843
int size
Definition: avcodec.h:1423
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:204
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1045
void * priv_data
Definition: avformat.h:862
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:277
int sample_size
Definition: nsvdec.c:158
static AVPacket pkt
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:87
#define NSV_MAX_RESYNC
Definition: nsvdec.c:34
static const AVCodecTag nsv_codec_audio_tags[]
Definition: nsvdec.c:202
Macro definitions for various function/variable attributes.
int base_offset
Definition: nsvdec.c:166
Format I/O context.
Definition: avformat.h:1273
Public dictionary API.
#define NSV_MAX_RESYNC_TRIES
Definition: nsvdec.c:35
#define NSV_ST_AUDIO
Definition: nsvdec.c:139
uint8_t
#define AV_LOG_TRACE
Extremely verbose debugging, useful for libav* development.
Definition: log.h:202
enum AVStreamParseType need_parsing
Definition: avformat.h:1034
int id
Format-specific stream ID.
Definition: avformat.h:849
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:3741
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1341
int new_frame_offset
Definition: nsvdec.c:161
uint8_t * data
Definition: avcodec.h:1422
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:244
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:81
ptrdiff_t size
Definition: opengl_enc.c:101
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:390
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2995
static int nsv_read_close(AVFormatContext *s)
Definition: nsvdec.c:709
static int64_t duration
Definition: ffplay.c:326
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:538
#define NSV_ST_VIDEO
Definition: nsvdec.c:138
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1468
static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: nsvdec.c:662
int64_t duration
Definition: nsvdec.c:173
#define AVINDEX_KEYFRAME
Definition: avformat.h:791
AVPacket ahead[2]
Definition: nsvdec.c:171
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1483
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:1844
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:659
#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:785
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:175
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:425
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_RL24
Definition: bytestream.h:87
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
AVRational framerate
Definition: nsvdec.c:177
#define fail()
Definition: checkasm.h:57
static int nsv_read_chunk(AVFormatContext *s, int fill_header)
Definition: nsvdec.c:530
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1428
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:529
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:861
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:1329
AVInputFormat ff_nsv_demuxer
Definition: nsvdec.c:753
static int nsv_parse_NSVs_header(AVFormatContext *s)
Definition: nsvdec.c:377
int scale
Definition: nsvdec.c:156
char filename[1024]
input or output filename
Definition: avformat.h:1349
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:127
static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: nsvdec.c:690
#define FFMIN(a, b)
Definition: common.h:66
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
int width
picture width / height.
Definition: avcodec.h:1680
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:109
NSVStatus
Definition: nsvdec.c:142
uint32_t vtag
Definition: nsvdec.c:174
static int nsv_probe(AVProbeData *p)
Definition: nsvdec.c:722
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:620
Stream structure.
Definition: avformat.h:842
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
sample_rate
enum AVMediaType codec_type
Definition: avcodec.h:1509
enum AVCodecID codec_id
Definition: avcodec.h:1518
int sample_rate
samples per second
Definition: avcodec.h:2261
AVIOContext * pb
I/O context.
Definition: avformat.h:1315
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1533
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:69
#define T_NONE
Definition: nsvdec.c:129
int index
Definition: gxfenc.c:89
rational number numerator/denominator
Definition: rational.h:43
#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:494
static int flags
Definition: cpu.c:47
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:901
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:460
full parsing and repack
Definition: avformat.h:774
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:643
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:894
uint32_t atag
Definition: nsvdec.c:174
int den
denominator
Definition: rational.h:45
unsigned bps
Definition: movenc.c:1335
#define MKBETAG(a, b, c, d)
Definition: common.h:316
#define av_free(p)
int index_entries
Definition: nsvdec.c:169
int channels
number of audio channels
Definition: avcodec.h:2262
void * priv_data
Format private data.
Definition: avformat.h:1301
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1421
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:628
#define av_malloc_array(a, b)
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:301
int16_t avsync
Definition: nsvdec.c:176
int stream_index
Definition: avcodec.h:1424
#define MKTAG(a, b, c, d)
Definition: common.h:315
#define print_tag(str, tag, size)
Definition: nsvdec.c:215
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1399
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:252
#define av_unused
Definition: attributes.h:118