FFmpeg  2.8.17
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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  int nsvf;
181 } NSVContext;
182 
184  { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
185  { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
186  { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
187  { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') },
188  { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
189  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
190  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
191  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
192  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
193  { AV_CODEC_ID_VP8, MKTAG('V', 'P', '8', '0') },
194 /*
195  { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
196  { AV_CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
197 */
198  { AV_CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
199  { AV_CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
200  { AV_CODEC_ID_NONE, 0 },
201 };
202 
204  { AV_CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') },
205  { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') },
206  { AV_CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') },
207  { AV_CODEC_ID_AAC, MKTAG('V', 'L', 'B', ' ') },
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 static int nsv_read_close(AVFormatContext *s);
216 
217 #define print_tag(str, tag, size) \
218  av_log(NULL, AV_LOG_TRACE, "%s: tag=%c%c%c%c\n", \
219  str, tag & 0xff, \
220  (tag >> 8) & 0xff, \
221  (tag >> 16) & 0xff, \
222  (tag >> 24) & 0xff);
223 
224 /* try to find something we recognize, and set the state accordingly */
226 {
227  NSVContext *nsv = s->priv_data;
228  AVIOContext *pb = s->pb;
229  uint32_t v = 0;
230  int i;
231 
232  av_log(s, AV_LOG_TRACE, "%s(), offset = %"PRId64", state = %d\n", __FUNCTION__, avio_tell(pb), nsv->state);
233 
234  //nsv->state = NSV_UNSYNC;
235 
236  for (i = 0; i < NSV_MAX_RESYNC; i++) {
237  if (avio_feof(pb)) {
238  av_log(s, AV_LOG_TRACE, "NSV EOF\n");
239  nsv->state = NSV_UNSYNC;
240  return -1;
241  }
242  v <<= 8;
243  v |= avio_r8(pb);
244  if (i < 8) {
245  av_log(s, AV_LOG_TRACE, "NSV resync: [%d] = %02x\n", i, v & 0x0FF);
246  }
247 
248  if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
249  av_log(s, AV_LOG_TRACE, "NSV resynced on BEEF after %d bytes\n", i+1);
250  nsv->state = NSV_FOUND_BEEF;
251  return 0;
252  }
253  /* we read as big-endian, thus the MK*BE* */
254  if (v == TB_NSVF) { /* NSVf */
255  av_log(s, AV_LOG_TRACE, "NSV resynced on NSVf after %d bytes\n", i+1);
256  nsv->state = NSV_FOUND_NSVF;
257  return 0;
258  }
259  if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
260  av_log(s, AV_LOG_TRACE, "NSV resynced on NSVs after %d bytes\n", i+1);
261  nsv->state = NSV_FOUND_NSVS;
262  return 0;
263  }
264 
265  }
266  av_log(s, AV_LOG_TRACE, "NSV sync lost\n");
267  return -1;
268 }
269 
271 {
272  NSVContext *nsv = s->priv_data;
273  AVIOContext *pb = s->pb;
274  unsigned int av_unused file_size;
275  unsigned int size;
276  int64_t duration;
277  int strings_size;
278  int table_entries;
279  int table_entries_used;
280 
281  av_log(s, AV_LOG_TRACE, "%s()\n", __FUNCTION__);
282 
283  nsv->state = NSV_UNSYNC; /* in case we fail */
284 
285  if (nsv->nsvf) {
286  av_log(s, AV_LOG_TRACE, "Multiple NSVf\n");
287  return 0;
288  }
289  nsv->nsvf = 1;
290 
291  size = avio_rl32(pb);
292  if (size < 28)
293  return -1;
294  nsv->NSVf_end = size;
295 
296  //s->file_size = (uint32_t)avio_rl32(pb);
297  file_size = (uint32_t)avio_rl32(pb);
298  av_log(s, AV_LOG_TRACE, "NSV NSVf chunk_size %u\n", size);
299  av_log(s, AV_LOG_TRACE, "NSV NSVf file_size %u\n", file_size);
300 
301  nsv->duration = duration = avio_rl32(pb); /* in ms */
302  av_log(s, AV_LOG_TRACE, "NSV NSVf duration %"PRId64" ms\n", duration);
303  // XXX: store it in AVStreams
304 
305  strings_size = avio_rl32(pb);
306  table_entries = avio_rl32(pb);
307  table_entries_used = avio_rl32(pb);
308  av_log(s, AV_LOG_TRACE, "NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
309  strings_size, table_entries, table_entries_used);
310  if (avio_feof(pb))
311  return -1;
312 
313  av_log(s, AV_LOG_TRACE, "NSV got header; filepos %"PRId64"\n", avio_tell(pb));
314 
315  if (strings_size > 0) {
316  char *strings; /* last byte will be '\0' to play safe with str*() */
317  char *p, *endp;
318  char *token, *value;
319  char quote;
320 
321  p = strings = av_mallocz((size_t)strings_size + 1);
322  if (!p)
323  return AVERROR(ENOMEM);
324  endp = strings + strings_size;
325  avio_read(pb, strings, strings_size);
326  while (p < endp) {
327  while (*p == ' ')
328  p++; /* strip out spaces */
329  if (p >= endp-2)
330  break;
331  token = p;
332  p = strchr(p, '=');
333  if (!p || p >= endp-2)
334  break;
335  *p++ = '\0';
336  quote = *p++;
337  value = p;
338  p = strchr(p, quote);
339  if (!p || p >= endp)
340  break;
341  *p++ = '\0';
342  av_log(s, AV_LOG_TRACE, "NSV NSVf INFO: %s='%s'\n", token, value);
343  av_dict_set(&s->metadata, token, value, 0);
344  }
345  av_free(strings);
346  }
347  if (avio_feof(pb))
348  return -1;
349 
350  av_log(s, AV_LOG_TRACE, "NSV got infos; filepos %"PRId64"\n", avio_tell(pb));
351 
352  if (table_entries_used > 0) {
353  int i;
354  nsv->index_entries = table_entries_used;
355  if((unsigned)table_entries_used >= UINT_MAX / sizeof(uint32_t))
356  return -1;
357  nsv->nsvs_file_offset = av_malloc_array((unsigned)table_entries_used, sizeof(uint32_t));
358  if (!nsv->nsvs_file_offset)
359  return AVERROR(ENOMEM);
360 
361  for(i=0;i<table_entries_used;i++) {
362  if (avio_feof(pb))
363  return AVERROR_INVALIDDATA;
364  nsv->nsvs_file_offset[i] = avio_rl32(pb) + size;
365  }
366 
367  if(table_entries > table_entries_used &&
368  avio_rl32(pb) == MKTAG('T','O','C','2')) {
369  nsv->nsvs_timestamps = av_malloc_array((unsigned)table_entries_used, sizeof(uint32_t));
370  if (!nsv->nsvs_timestamps)
371  return AVERROR(ENOMEM);
372  for(i=0;i<table_entries_used;i++) {
373  nsv->nsvs_timestamps[i] = avio_rl32(pb);
374  }
375  }
376  }
377 
378  av_log(s, AV_LOG_TRACE, "NSV got index; filepos %"PRId64"\n", avio_tell(pb));
379 
380  avio_seek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
381 
382  if (avio_feof(pb))
383  return -1;
384  nsv->state = NSV_HAS_READ_NSVF;
385  return 0;
386 }
387 
389 {
390  NSVContext *nsv = s->priv_data;
391  AVIOContext *pb = s->pb;
392  uint32_t vtag, atag;
393  uint16_t vwidth, vheight;
394  AVRational framerate;
395  int i;
396  AVStream *st;
397  NSVStream *nst;
398  av_log(s, AV_LOG_TRACE, "%s()\n", __FUNCTION__);
399 
400  vtag = avio_rl32(pb);
401  atag = avio_rl32(pb);
402  vwidth = avio_rl16(pb);
403  vheight = avio_rl16(pb);
404  i = avio_r8(pb);
405 
406  av_log(s, AV_LOG_TRACE, "NSV NSVs framerate code %2x\n", i);
407  if(i&0x80) { /* odd way of giving native framerates from docs */
408  int t=(i & 0x7F)>>2;
409  if(t<16) framerate = (AVRational){1, t+1};
410  else framerate = (AVRational){t-15, 1};
411 
412  if(i&1){
413  framerate.num *= 1000;
414  framerate.den *= 1001;
415  }
416 
417  if((i&3)==3) framerate.num *= 24;
418  else if((i&3)==2) framerate.num *= 25;
419  else framerate.num *= 30;
420  }
421  else
422  framerate= (AVRational){i, 1};
423 
424  nsv->avsync = avio_rl16(pb);
425  nsv->framerate = framerate;
426 
427  print_tag("NSV NSVs vtag", vtag, 0);
428  print_tag("NSV NSVs atag", atag, 0);
429  av_log(s, AV_LOG_TRACE, "NSV NSVs vsize %dx%d\n", vwidth, vheight);
430 
431  /* XXX change to ap != NULL ? */
432  if (s->nb_streams == 0) { /* streams not yet published, let's do that */
433  nsv->vtag = vtag;
434  nsv->atag = atag;
435  nsv->vwidth = vwidth;
436  nsv->vheight = vwidth;
437  if (vtag != T_NONE) {
438  int i;
439  st = avformat_new_stream(s, NULL);
440  if (!st)
441  goto fail;
442 
443  st->id = NSV_ST_VIDEO;
444  nst = av_mallocz(sizeof(NSVStream));
445  if (!nst)
446  goto fail;
447  st->priv_data = nst;
449  st->codec->codec_tag = vtag;
450  st->codec->codec_id = ff_codec_get_id(nsv_codec_video_tags, vtag);
451  st->codec->width = vwidth;
452  st->codec->height = vheight;
453  st->codec->bits_per_coded_sample = 24; /* depth XXX */
454 
455  avpriv_set_pts_info(st, 64, framerate.den, framerate.num);
456  st->start_time = 0;
457  st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
458 
459  for(i=0;i<nsv->index_entries;i++) {
460  if(nsv->nsvs_timestamps) {
462  0, 0, AVINDEX_KEYFRAME);
463  } else {
464  int64_t ts = av_rescale(i*nsv->duration/nsv->index_entries, framerate.num, 1000*framerate.den);
465  av_add_index_entry(st, nsv->nsvs_file_offset[i], ts, 0, 0, AVINDEX_KEYFRAME);
466  }
467  }
468  }
469  if (atag != T_NONE) {
470  st = avformat_new_stream(s, NULL);
471  if (!st)
472  goto fail;
473 
474  st->id = NSV_ST_AUDIO;
475  nst = av_mallocz(sizeof(NSVStream));
476  if (!nst)
477  goto fail;
478  st->priv_data = nst;
480  st->codec->codec_tag = atag;
481  st->codec->codec_id = ff_codec_get_id(nsv_codec_audio_tags, atag);
482 
483  st->need_parsing = AVSTREAM_PARSE_FULL; /* for PCM we will read a chunk later and put correct info */
484 
485  /* set timebase to common denominator of ms and framerate */
486  avpriv_set_pts_info(st, 64, 1, framerate.num*1000);
487  st->start_time = 0;
488  st->duration = (int64_t)nsv->duration * framerate.num;
489  }
490  } else {
491  if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
492  av_log(s, AV_LOG_TRACE, "NSV NSVs header values differ from the first one!!!\n");
493  //return -1;
494  }
495  }
496 
497  nsv->state = NSV_HAS_READ_NSVS;
498  return 0;
499 fail:
500  /* XXX */
501  nsv->state = NSV_UNSYNC;
502  return -1;
503 }
504 
506 {
507  NSVContext *nsv = s->priv_data;
508  int i, err;
509 
510  av_log(s, AV_LOG_TRACE, "%s()\n", __FUNCTION__);
511  av_log(s, AV_LOG_TRACE, "filename '%s'\n", s->filename);
512 
513  nsv->state = NSV_UNSYNC;
514  nsv->ahead[0].data = nsv->ahead[1].data = NULL;
515 
516  for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
517  err = nsv_resync(s);
518  if (err < 0)
519  goto fail;
520  if (nsv->state == NSV_FOUND_NSVF) {
521  err = nsv_parse_NSVf_header(s);
522  if (err < 0)
523  goto fail;
524  }
525  /* we need the first NSVs also... */
526  if (nsv->state == NSV_FOUND_NSVS) {
527  err = nsv_parse_NSVs_header(s);
528  if (err < 0)
529  goto fail;
530  break; /* we just want the first one */
531  }
532  }
533  if (s->nb_streams < 1) { /* no luck so far */
534  err = AVERROR_INVALIDDATA;
535  goto fail;
536  }
537 
538  /* now read the first chunk, so we can attempt to decode more info */
539  err = nsv_read_chunk(s, 1);
540 fail:
541  if (err < 0)
542  nsv_read_close(s);
543 
544  av_log(s, AV_LOG_TRACE, "parsed header\n");
545  return err;
546 }
547 
548 static int nsv_read_chunk(AVFormatContext *s, int fill_header)
549 {
550  NSVContext *nsv = s->priv_data;
551  AVIOContext *pb = s->pb;
552  AVStream *st[2] = {NULL, NULL};
553  NSVStream *nst;
554  AVPacket *pkt;
555  int i, err = 0;
556  uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
557  uint32_t vsize;
558  uint16_t asize;
559  uint16_t auxsize;
560  int ret;
561 
562  av_log(s, AV_LOG_TRACE, "%s(%d)\n", __FUNCTION__, fill_header);
563 
564  if (nsv->ahead[0].data || nsv->ahead[1].data)
565  return 0; //-1; /* hey! eat what you've in your plate first! */
566 
567 null_chunk_retry:
568  if (avio_feof(pb))
569  return -1;
570 
571  for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
572  err = nsv_resync(s);
573  if (err < 0)
574  return err;
575  if (nsv->state == NSV_FOUND_NSVS)
576  err = nsv_parse_NSVs_header(s);
577  if (err < 0)
578  return err;
579  if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
580  return -1;
581 
582  auxcount = avio_r8(pb);
583  vsize = avio_rl16(pb);
584  asize = avio_rl16(pb);
585  vsize = (vsize << 4) | (auxcount >> 4);
586  auxcount &= 0x0f;
587  av_log(s, AV_LOG_TRACE, "NSV CHUNK %d aux, %u bytes video, %d bytes audio\n", auxcount, vsize, asize);
588  /* skip aux stuff */
589  for (i = 0; i < auxcount; i++) {
590  uint32_t av_unused auxtag;
591  auxsize = avio_rl16(pb);
592  auxtag = avio_rl32(pb);
593  av_log(s, AV_LOG_TRACE, "NSV aux data: '%c%c%c%c', %d bytes\n",
594  (auxtag & 0x0ff),
595  ((auxtag >> 8) & 0x0ff),
596  ((auxtag >> 16) & 0x0ff),
597  ((auxtag >> 24) & 0x0ff),
598  auxsize);
599  avio_skip(pb, auxsize);
600  vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */
601  }
602 
603  if (avio_feof(pb))
604  return -1;
605  if (!vsize && !asize) {
606  nsv->state = NSV_UNSYNC;
607  goto null_chunk_retry;
608  }
609 
610  /* map back streams to v,a */
611  if (s->nb_streams > 0)
612  st[s->streams[0]->id] = s->streams[0];
613  if (s->nb_streams > 1)
614  st[s->streams[1]->id] = s->streams[1];
615 
616  if (vsize && st[NSV_ST_VIDEO]) {
617  nst = st[NSV_ST_VIDEO]->priv_data;
618  pkt = &nsv->ahead[NSV_ST_VIDEO];
619  if ((ret = av_get_packet(pb, pkt, vsize)) < 0)
620  return ret;
621  pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
622  pkt->dts = nst->frame_offset;
623  pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
624  for (i = 0; i < FFMIN(8, vsize); i++)
625  av_log(s, AV_LOG_TRACE, "NSV video: [%d] = %02x\n", i, pkt->data[i]);
626  }
627  if(st[NSV_ST_VIDEO])
628  ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++;
629 
630  if (asize && st[NSV_ST_AUDIO]) {
631  nst = st[NSV_ST_AUDIO]->priv_data;
632  pkt = &nsv->ahead[NSV_ST_AUDIO];
633  /* read raw audio specific header on the first audio chunk... */
634  /* on ALL audio chunks ?? seems so! */
635  if (asize && st[NSV_ST_AUDIO]->codec->codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
636  uint8_t bps;
637  uint8_t channels;
638  uint16_t samplerate;
639  bps = avio_r8(pb);
640  channels = avio_r8(pb);
641  samplerate = avio_rl16(pb);
642  if (!channels || !samplerate)
643  return AVERROR_INVALIDDATA;
644  asize-=4;
645  av_log(s, AV_LOG_TRACE, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
646  if (fill_header) {
647  st[NSV_ST_AUDIO]->need_parsing = AVSTREAM_PARSE_NONE; /* we know everything */
648  if (bps != 16) {
649  av_log(s, AV_LOG_TRACE, "NSV AUDIO bit/sample != 16 (%d)!!!\n", bps);
650  }
651  bps /= channels; // ???
652  if (bps == 8)
654  samplerate /= 4;/* UGH ??? XXX */
655  channels = 1;
656  st[NSV_ST_AUDIO]->codec->channels = channels;
657  st[NSV_ST_AUDIO]->codec->sample_rate = samplerate;
658  av_log(s, AV_LOG_TRACE, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
659  }
660  }
661  if ((ret = av_get_packet(pb, pkt, asize)) < 0)
662  return ret;
663  pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
664  pkt->flags |= nsv->state == NSV_HAS_READ_NSVS ? AV_PKT_FLAG_KEY : 0; /* keyframe only likely on a sync frame */
665  if( nsv->state == NSV_HAS_READ_NSVS && st[NSV_ST_VIDEO] ) {
666  /* on a nsvs frame we have new information on a/v sync */
667  pkt->dts = (((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset-1);
668  pkt->dts *= (int64_t)1000 * nsv->framerate.den;
669  pkt->dts += (int64_t)nsv->avsync * nsv->framerate.num;
670  av_log(s, AV_LOG_TRACE, "NSV AUDIO: sync:%d, dts:%"PRId64, nsv->avsync, pkt->dts);
671  }
672  nst->frame_offset++;
673  }
674 
675  nsv->state = NSV_UNSYNC;
676  return 0;
677 }
678 
679 
681 {
682  NSVContext *nsv = s->priv_data;
683  int i, err = 0;
684 
685  av_log(s, AV_LOG_TRACE, "%s()\n", __FUNCTION__);
686 
687  /* in case we don't already have something to eat ... */
688  if (!nsv->ahead[0].data && !nsv->ahead[1].data)
689  err = nsv_read_chunk(s, 0);
690  if (err < 0)
691  return err;
692 
693  /* now pick one of the plates */
694  for (i = 0; i < 2; i++) {
695  if (nsv->ahead[i].data) {
696  av_log(s, AV_LOG_TRACE, "%s: using cached packet[%d]\n", __FUNCTION__, i);
697  /* avoid the cost of new_packet + memcpy(->data) */
698  memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket));
699  nsv->ahead[i].data = NULL; /* we ate that one */
700  return pkt->size;
701  }
702  }
703 
704  /* this restaurant is not approvisionned :^] */
705  return -1;
706 }
707 
708 static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
709 {
710  NSVContext *nsv = s->priv_data;
711  AVStream *st = s->streams[stream_index];
712  NSVStream *nst = st->priv_data;
713  int index;
714 
715  index = av_index_search_timestamp(st, timestamp, flags);
716  if(index < 0)
717  return -1;
718 
719  if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
720  return -1;
721 
723  nsv->state = NSV_UNSYNC;
724  return 0;
725 }
726 
728 {
729  NSVContext *nsv = s->priv_data;
730 
731  av_freep(&nsv->nsvs_file_offset);
732  av_freep(&nsv->nsvs_timestamps);
733  if (nsv->ahead[0].data)
734  av_free_packet(&nsv->ahead[0]);
735  if (nsv->ahead[1].data)
736  av_free_packet(&nsv->ahead[1]);
737  return 0;
738 }
739 
740 static int nsv_probe(AVProbeData *p)
741 {
742  int i, score = 0;
743 
744  /* check file header */
745  /* streamed files might not have any header */
746  if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
747  p->buf[2] == 'V' && (p->buf[3] == 'f' || p->buf[3] == 's'))
748  return AVPROBE_SCORE_MAX;
749  /* XXX: do streamed files always start at chunk boundary ?? */
750  /* or do we need to search NSVs in the byte stream ? */
751  /* seems the servers don't bother starting clean chunks... */
752  /* sometimes even the first header is at 9KB or something :^) */
753  for (i = 1; i < p->buf_size - 3; i++) {
754  if (AV_RL32(p->buf + i) == AV_RL32("NSVs")) {
755  /* Get the chunk size and check if at the end we are getting 0xBEEF */
756  int vsize = AV_RL24(p->buf+i+19) >> 4;
757  int asize = AV_RL16(p->buf+i+22);
758  int offset = i + 23 + asize + vsize + 1;
759  if (offset <= p->buf_size - 2 && AV_RL16(p->buf + offset) == 0xBEEF)
760  return 4*AVPROBE_SCORE_MAX/5;
761  score = AVPROBE_SCORE_MAX/5;
762  }
763  }
764  /* so we'll have more luck on extension... */
765  if (av_match_ext(p->filename, "nsv"))
767  /* FIXME: add mime-type check */
768  return score;
769 }
770 
772  .name = "nsv",
773  .long_name = NULL_IF_CONFIG_SMALL("Nullsoft Streaming Video"),
774  .priv_data_size = sizeof(NSVContext),
780 };
#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:284
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:1749
static const AVCodecTag nsv_codec_video_tags[]
Definition: nsvdec.c:183
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:2783
static int nsv_parse_NSVf_header(AVFormatContext *s)
Definition: nsvdec.c:270
uint32_t * nsvs_file_offset
Definition: nsvdec.c:168
uint16_t vheight
Definition: nsvdec.c:175
const char * filename
Definition: avformat.h:461
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:4098
uint32_t * nsvs_timestamps
Definition: nsvdec.c:178
int64_t pos
Definition: avformat.h:796
#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:855
int size
Definition: avcodec.h:1434
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:1057
#define AV_RL16
Definition: intreadwrite.h:42
void * priv_data
Definition: avformat.h:874
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:279
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:203
Macro definitions for various function/variable attributes.
int base_offset
Definition: nsvdec.c:166
Format I/O context.
Definition: avformat.h:1285
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:1046
int id
Format-specific stream ID.
Definition: avformat.h:861
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:3761
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1353
int new_frame_offset
Definition: nsvdec.c:161
uint8_t * data
Definition: avcodec.h:1433
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:225
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:85
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:3006
static int nsv_read_close(AVFormatContext *s)
Definition: nsvdec.c:727
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:542
#define NSV_ST_VIDEO
Definition: nsvdec.c:138
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1479
static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: nsvdec.c:680
int64_t duration
Definition: nsvdec.c:173
#define AVINDEX_KEYFRAME
Definition: avformat.h:803
AVPacket ahead[2]
Definition: nsvdec.c:171
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1497
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:1850
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:663
#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:797
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:178
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:425
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:548
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1439
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:533
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:873
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:463
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:462
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1341
AVInputFormat ff_nsv_demuxer
Definition: nsvdec.c:771
static int nsv_parse_NSVs_header(AVFormatContext *s)
Definition: nsvdec.c:388
int scale
Definition: nsvdec.c:156
char filename[1024]
input or output filename
Definition: avformat.h:1361
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:134
static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: nsvdec.c:708
#define FFMIN(a, b)
Definition: common.h:92
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
int width
picture width / height.
Definition: avcodec.h:1691
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:109
NSVStatus
Definition: nsvdec.c:142
uint32_t vtag
Definition: nsvdec.c:174
#define AV_RL32
Definition: intreadwrite.h:146
static int nsv_probe(AVProbeData *p)
Definition: nsvdec.c:740
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:634
Stream structure.
Definition: avformat.h:854
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:1520
enum AVCodecID codec_id
Definition: avcodec.h:1529
int sample_rate
samples per second
Definition: avcodec.h:2272
AVIOContext * pb
I/O context.
Definition: avformat.h:1327
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1544
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:470
This structure contains the data a format has to probe a file.
Definition: avformat.h:460
static int nsv_read_header(AVFormatContext *s)
Definition: nsvdec.c:505
static int flags
Definition: cpu.c:47
#define AV_RL24
Definition: intreadwrite.h:78
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:913
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:472
full parsing and repack
Definition: avformat.h:786
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:647
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:906
uint32_t atag
Definition: nsvdec.c:174
int den
denominator
Definition: rational.h:45
unsigned bps
Definition: movenc.c:1340
#define MKBETAG(a, b, c, d)
Definition: common.h:342
#define av_free(p)
int index_entries
Definition: nsvdec.c:169
int channels
number of audio channels
Definition: avcodec.h:2273
void * priv_data
Format private data.
Definition: avformat.h:1313
int nsvf
Definition: nsvdec.c:180
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1432
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:640
#define av_malloc_array(a, b)
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:303
int16_t avsync
Definition: nsvdec.c:176
int stream_index
Definition: avcodec.h:1435
#define MKTAG(a, b, c, d)
Definition: common.h:341
#define print_tag(str, tag, size)
Definition: nsvdec.c:217
This structure stores compressed data.
Definition: avcodec.h:1410
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