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nutdec.c
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1 /*
2  * "NUT" Container Format demuxer
3  * Copyright (c) 2004-2006 Michael Niedermayer
4  * Copyright (c) 2003 Alex Beregszaszi
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "libavutil/avstring.h"
24 #include "libavutil/avassert.h"
25 #include "libavutil/bswap.h"
26 #include "libavutil/dict.h"
27 #include "libavutil/intreadwrite.h"
28 #include "libavutil/mathematics.h"
29 #include "libavutil/tree.h"
30 #include "libavcodec/bytestream.h"
31 #include "avio_internal.h"
32 #include "isom.h"
33 #include "nut.h"
34 #include "riff.h"
35 
36 #define NUT_MAX_STREAMS 256 /* arbitrary sanity check value */
37 
38 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,
39  int64_t *pos_arg, int64_t pos_limit);
40 
41 static int get_str(AVIOContext *bc, char *string, unsigned int maxlen)
42 {
43  unsigned int len = ffio_read_varlen(bc);
44 
45  if (len && maxlen)
46  avio_read(bc, string, FFMIN(len, maxlen));
47  while (len > maxlen) {
48  avio_r8(bc);
49  len--;
50  if (bc->eof_reached)
51  len = maxlen;
52  }
53 
54  if (maxlen)
55  string[FFMIN(len, maxlen - 1)] = 0;
56 
57  if (bc->eof_reached)
58  return AVERROR_EOF;
59  if (maxlen == len)
60  return -1;
61  else
62  return 0;
63 }
64 
65 static int64_t get_s(AVIOContext *bc)
66 {
67  int64_t v = ffio_read_varlen(bc) + 1;
68 
69  if (v & 1)
70  return -(v >> 1);
71  else
72  return (v >> 1);
73 }
74 
75 static uint64_t get_fourcc(AVIOContext *bc)
76 {
77  unsigned int len = ffio_read_varlen(bc);
78 
79  if (len == 2)
80  return avio_rl16(bc);
81  else if (len == 4)
82  return avio_rl32(bc);
83  else {
84  av_log(NULL, AV_LOG_ERROR, "Unsupported fourcc length %d\n", len);
85  return -1;
86  }
87 }
88 
89 #ifdef TRACE
90 static inline uint64_t get_v_trace(AVIOContext *bc, const char *file,
91  const char *func, int line)
92 {
93  uint64_t v = ffio_read_varlen(bc);
94 
95  av_log(NULL, AV_LOG_DEBUG, "get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n",
96  v, v, file, func, line);
97  return v;
98 }
99 
100 static inline int64_t get_s_trace(AVIOContext *bc, const char *file,
101  const char *func, int line)
102 {
103  int64_t v = get_s(bc);
104 
105  av_log(NULL, AV_LOG_DEBUG, "get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n",
106  v, v, file, func, line);
107  return v;
108 }
109 
110 static inline uint64_t get_4cc_trace(AVIOContext *bc, char *file,
111  char *func, int line)
112 {
113  uint64_t v = get_fourcc(bc);
114 
115  av_log(NULL, AV_LOG_DEBUG, "get_fourcc %5"PRId64" / %"PRIX64" in %s %s:%d\n",
116  v, v, file, func, line);
117  return v;
118 }
119 #define ffio_read_varlen(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
120 #define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
121 #define get_fourcc(bc) get_4cc_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
122 #endif
123 
125  int calculate_checksum, uint64_t startcode)
126 {
127  int64_t size;
128 // start = avio_tell(bc) - 8;
129 
130  startcode = av_be2ne64(startcode);
131  startcode = ff_crc04C11DB7_update(0, (uint8_t*) &startcode, 8);
132 
134  size = ffio_read_varlen(bc);
135  if (size > 4096)
136  avio_rb32(bc);
137  if (ffio_get_checksum(bc) && size > 4096)
138  return -1;
139 
140  ffio_init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0);
141 
142  return size;
143 }
144 
145 static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos)
146 {
147  uint64_t state = 0;
148 
149  if (pos >= 0)
150  /* Note, this may fail if the stream is not seekable, but that should
151  * not matter, as in this case we simply start where we currently are */
152  avio_seek(bc, pos, SEEK_SET);
153  while (!avio_feof(bc)) {
154  state = (state << 8) | avio_r8(bc);
155  if ((state >> 56) != 'N')
156  continue;
157  switch (state) {
158  case MAIN_STARTCODE:
159  case STREAM_STARTCODE:
160  case SYNCPOINT_STARTCODE:
161  case INFO_STARTCODE:
162  case INDEX_STARTCODE:
163  return state;
164  }
165  }
166 
167  return 0;
168 }
169 
170 /**
171  * Find the given startcode.
172  * @param code the startcode
173  * @param pos the start position of the search, or -1 if the current position
174  * @return the position of the startcode or -1 if not found
175  */
176 static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos)
177 {
178  for (;;) {
179  uint64_t startcode = find_any_startcode(bc, pos);
180  if (startcode == code)
181  return avio_tell(bc) - 8;
182  else if (startcode == 0)
183  return -1;
184  pos = -1;
185  }
186 }
187 
188 static int nut_probe(AVProbeData *p)
189 {
190  int i;
191 
192  for (i = 0; i < p->buf_size-8; i++) {
193  if (AV_RB32(p->buf+i) != MAIN_STARTCODE>>32)
194  continue;
195  if (AV_RB32(p->buf+i+4) == (MAIN_STARTCODE & 0xFFFFFFFF))
196  return AVPROBE_SCORE_MAX;
197  }
198  return 0;
199 }
200 
201 #define GET_V(dst, check) \
202  do { \
203  tmp = ffio_read_varlen(bc); \
204  if (!(check)) { \
205  av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp); \
206  ret = AVERROR_INVALIDDATA; \
207  goto fail; \
208  } \
209  dst = tmp; \
210  } while (0)
211 
212 static int skip_reserved(AVIOContext *bc, int64_t pos)
213 {
214  pos -= avio_tell(bc);
215  if (pos < 0) {
216  avio_seek(bc, pos, SEEK_CUR);
217  return AVERROR_INVALIDDATA;
218  } else {
219  while (pos--) {
220  if (bc->eof_reached)
221  return AVERROR_INVALIDDATA;
222  avio_r8(bc);
223  }
224  return 0;
225  }
226 }
227 
229 {
230  AVFormatContext *s = nut->avf;
231  AVIOContext *bc = s->pb;
232  uint64_t tmp, end;
233  unsigned int stream_count;
234  int i, j, count, ret;
235  int tmp_stream, tmp_mul, tmp_pts, tmp_size, tmp_res, tmp_head_idx;
236 
237  end = get_packetheader(nut, bc, 1, MAIN_STARTCODE);
238  end += avio_tell(bc);
239 
240  nut->version = ffio_read_varlen(bc);
241  if (nut->version < NUT_MIN_VERSION &&
242  nut->version > NUT_MAX_VERSION) {
243  av_log(s, AV_LOG_ERROR, "Version %d not supported.\n",
244  nut->version);
245  return AVERROR(ENOSYS);
246  }
247  if (nut->version > 3)
248  nut->minor_version = ffio_read_varlen(bc);
249 
250  GET_V(stream_count, tmp > 0 && tmp <= NUT_MAX_STREAMS);
251 
252  nut->max_distance = ffio_read_varlen(bc);
253  if (nut->max_distance > 65536) {
254  av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance);
255  nut->max_distance = 65536;
256  }
257 
258  GET_V(nut->time_base_count, tmp > 0 && tmp < INT_MAX / sizeof(AVRational));
259  nut->time_base = av_malloc_array(nut->time_base_count, sizeof(AVRational));
260  if (!nut->time_base)
261  return AVERROR(ENOMEM);
262 
263  for (i = 0; i < nut->time_base_count; i++) {
264  GET_V(nut->time_base[i].num, tmp > 0 && tmp < (1ULL << 31));
265  GET_V(nut->time_base[i].den, tmp > 0 && tmp < (1ULL << 31));
266  if (av_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1) {
267  av_log(s, AV_LOG_ERROR, "invalid time base %d/%d\n",
268  nut->time_base[i].num,
269  nut->time_base[i].den);
270  ret = AVERROR_INVALIDDATA;
271  goto fail;
272  }
273  }
274  tmp_pts = 0;
275  tmp_mul = 1;
276  tmp_stream = 0;
277  tmp_head_idx = 0;
278  for (i = 0; i < 256;) {
279  int tmp_flags = ffio_read_varlen(bc);
280  int tmp_fields = ffio_read_varlen(bc);
281 
282  if (tmp_fields > 0)
283  tmp_pts = get_s(bc);
284  if (tmp_fields > 1)
285  tmp_mul = ffio_read_varlen(bc);
286  if (tmp_fields > 2)
287  tmp_stream = ffio_read_varlen(bc);
288  if (tmp_fields > 3)
289  tmp_size = ffio_read_varlen(bc);
290  else
291  tmp_size = 0;
292  if (tmp_fields > 4)
293  tmp_res = ffio_read_varlen(bc);
294  else
295  tmp_res = 0;
296  if (tmp_fields > 5)
297  count = ffio_read_varlen(bc);
298  else
299  count = tmp_mul - tmp_size;
300  if (tmp_fields > 6)
301  get_s(bc);
302  if (tmp_fields > 7)
303  tmp_head_idx = ffio_read_varlen(bc);
304 
305  while (tmp_fields-- > 8) {
306  if (bc->eof_reached) {
307  av_log(s, AV_LOG_ERROR, "reached EOF while decoding main header\n");
308  ret = AVERROR_INVALIDDATA;
309  goto fail;
310  }
311  ffio_read_varlen(bc);
312  }
313 
314  if (count <= 0 || count > 256 - (i <= 'N') - i) {
315  av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
316  ret = AVERROR_INVALIDDATA;
317  goto fail;
318  }
319  if (tmp_stream >= stream_count) {
320  av_log(s, AV_LOG_ERROR, "illegal stream number %d >= %d\n",
321  tmp_stream, stream_count);
322  ret = AVERROR_INVALIDDATA;
323  goto fail;
324  }
325 
326  for (j = 0; j < count; j++, i++) {
327  if (i == 'N') {
328  nut->frame_code[i].flags = FLAG_INVALID;
329  j--;
330  continue;
331  }
332  nut->frame_code[i].flags = tmp_flags;
333  nut->frame_code[i].pts_delta = tmp_pts;
334  nut->frame_code[i].stream_id = tmp_stream;
335  nut->frame_code[i].size_mul = tmp_mul;
336  nut->frame_code[i].size_lsb = tmp_size + j;
337  nut->frame_code[i].reserved_count = tmp_res;
338  nut->frame_code[i].header_idx = tmp_head_idx;
339  }
340  }
341  av_assert0(nut->frame_code['N'].flags == FLAG_INVALID);
342 
343  if (end > avio_tell(bc) + 4) {
344  int rem = 1024;
345  GET_V(nut->header_count, tmp < 128U);
346  nut->header_count++;
347  for (i = 1; i < nut->header_count; i++) {
348  uint8_t *hdr;
349  GET_V(nut->header_len[i], tmp > 0 && tmp < 256);
350  if (rem < nut->header_len[i]) {
351  av_log(s, AV_LOG_ERROR,
352  "invalid elision header %d : %d > %d\n",
353  i, nut->header_len[i], rem);
354  ret = AVERROR_INVALIDDATA;
355  goto fail;
356  }
357  rem -= nut->header_len[i];
358  hdr = av_malloc(nut->header_len[i]);
359  if (!hdr) {
360  ret = AVERROR(ENOMEM);
361  goto fail;
362  }
363  avio_read(bc, hdr, nut->header_len[i]);
364  nut->header[i] = hdr;
365  }
366  av_assert0(nut->header_len[0] == 0);
367  }
368 
369  // flags had been effectively introduced in version 4
370  if (nut->version > 3 && end > avio_tell(bc) + 4) {
371  nut->flags = ffio_read_varlen(bc);
372  }
373 
374  if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
375  av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n");
376  ret = AVERROR_INVALIDDATA;
377  goto fail;
378  }
379 
380  nut->stream = av_calloc(stream_count, sizeof(StreamContext));
381  if (!nut->stream) {
382  ret = AVERROR(ENOMEM);
383  goto fail;
384  }
385  for (i = 0; i < stream_count; i++)
387 
388  return 0;
389 fail:
390  av_freep(&nut->time_base);
391  for (i = 1; i < nut->header_count; i++) {
392  av_freep(&nut->header[i]);
393  }
394  nut->header_count = 0;
395  return ret;
396 }
397 
399 {
400  AVFormatContext *s = nut->avf;
401  AVIOContext *bc = s->pb;
402  StreamContext *stc;
403  int class, stream_id, ret;
404  uint64_t tmp, end;
405  AVStream *st = NULL;
406 
407  end = get_packetheader(nut, bc, 1, STREAM_STARTCODE);
408  end += avio_tell(bc);
409 
410  GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base);
411  stc = &nut->stream[stream_id];
412  st = s->streams[stream_id];
413  if (!st)
414  return AVERROR(ENOMEM);
415 
416  class = ffio_read_varlen(bc);
417  tmp = get_fourcc(bc);
418  st->codecpar->codec_tag = tmp;
419  switch (class) {
420  case 0:
422  st->codecpar->codec_id = av_codec_get_id((const AVCodecTag * const []) {
426  0
427  },
428  tmp);
429  break;
430  case 1:
432  st->codecpar->codec_id = av_codec_get_id((const AVCodecTag * const []) {
436  0
437  },
438  tmp);
439  break;
440  case 2:
443  break;
444  case 3:
447  break;
448  default:
449  av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class);
450  return AVERROR(ENOSYS);
451  }
452  if (class < 3 && st->codecpar->codec_id == AV_CODEC_ID_NONE)
453  av_log(s, AV_LOG_ERROR,
454  "Unknown codec tag '0x%04x' for stream number %d\n",
455  (unsigned int) tmp, stream_id);
456 
457  GET_V(stc->time_base_id, tmp < nut->time_base_count);
458  GET_V(stc->msb_pts_shift, tmp < 16);
460  GET_V(stc->decode_delay, tmp < 1000); // sanity limit, raise this if Moore's law is true
461  st->codecpar->video_delay = stc->decode_delay;
462  ffio_read_varlen(bc); // stream flags
463 
464  GET_V(st->codecpar->extradata_size, tmp < (1 << 30));
465  if (st->codecpar->extradata_size) {
466  if (ff_get_extradata(s, st->codecpar, bc, st->codecpar->extradata_size) < 0)
467  return AVERROR(ENOMEM);
468  }
469 
470  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
471  GET_V(st->codecpar->width, tmp > 0);
472  GET_V(st->codecpar->height, tmp > 0);
475  if ((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)) {
476  av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n",
478  ret = AVERROR_INVALIDDATA;
479  goto fail;
480  }
481  ffio_read_varlen(bc); /* csp type */
482  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
483  GET_V(st->codecpar->sample_rate, tmp > 0);
484  ffio_read_varlen(bc); // samplerate_den
485  GET_V(st->codecpar->channels, tmp > 0);
486  }
487  if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
488  av_log(s, AV_LOG_ERROR,
489  "stream header %d checksum mismatch\n", stream_id);
490  ret = AVERROR_INVALIDDATA;
491  goto fail;
492  }
493  stc->time_base = &nut->time_base[stc->time_base_id];
494  avpriv_set_pts_info(s->streams[stream_id], 63, stc->time_base->num,
495  stc->time_base->den);
496  return 0;
497 fail:
498  if (st && st->codecpar) {
499  av_freep(&st->codecpar->extradata);
500  st->codecpar->extradata_size = 0;
501  }
502  return ret;
503 }
504 
506  int stream_id)
507 {
508  int flag = 0, i;
509 
510  for (i = 0; ff_nut_dispositions[i].flag; ++i)
511  if (!strcmp(ff_nut_dispositions[i].str, value))
512  flag = ff_nut_dispositions[i].flag;
513  if (!flag)
514  av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value);
515  for (i = 0; i < avf->nb_streams; ++i)
516  if (stream_id == i || stream_id == -1)
517  avf->streams[i]->disposition |= flag;
518 }
519 
521 {
522  AVFormatContext *s = nut->avf;
523  AVIOContext *bc = s->pb;
524  uint64_t tmp, chapter_start, chapter_len;
525  unsigned int stream_id_plus1, count;
526  int chapter_id, i, ret = 0;
527  int64_t value, end;
528  char name[256], str_value[1024], type_str[256];
529  const char *type;
530  int *event_flags = NULL;
531  AVChapter *chapter = NULL;
532  AVStream *st = NULL;
533  AVDictionary **metadata = NULL;
534  int metadata_flag = 0;
535 
536  end = get_packetheader(nut, bc, 1, INFO_STARTCODE);
537  end += avio_tell(bc);
538 
539  GET_V(stream_id_plus1, tmp <= s->nb_streams);
540  chapter_id = get_s(bc);
541  chapter_start = ffio_read_varlen(bc);
542  chapter_len = ffio_read_varlen(bc);
543  count = ffio_read_varlen(bc);
544 
545  if (chapter_id && !stream_id_plus1) {
546  int64_t start = chapter_start / nut->time_base_count;
547  chapter = avpriv_new_chapter(s, chapter_id,
548  nut->time_base[chapter_start %
549  nut->time_base_count],
550  start, start + chapter_len, NULL);
551  if (!chapter) {
552  av_log(s, AV_LOG_ERROR, "Could not create chapter.\n");
553  return AVERROR(ENOMEM);
554  }
555  metadata = &chapter->metadata;
556  } else if (stream_id_plus1) {
557  st = s->streams[stream_id_plus1 - 1];
558  metadata = &st->metadata;
559  event_flags = &st->event_flags;
560  metadata_flag = AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
561  } else {
562  metadata = &s->metadata;
563  event_flags = &s->event_flags;
564  metadata_flag = AVFMT_EVENT_FLAG_METADATA_UPDATED;
565  }
566 
567  for (i = 0; i < count; i++) {
568  ret = get_str(bc, name, sizeof(name));
569  if (ret < 0) {
570  av_log(s, AV_LOG_ERROR, "get_str failed while decoding info header\n");
571  return ret;
572  }
573  value = get_s(bc);
574  str_value[0] = 0;
575 
576  if (value == -1) {
577  type = "UTF-8";
578  ret = get_str(bc, str_value, sizeof(str_value));
579  } else if (value == -2) {
580  ret = get_str(bc, type_str, sizeof(type_str));
581  if (ret < 0) {
582  av_log(s, AV_LOG_ERROR, "get_str failed while decoding info header\n");
583  return ret;
584  }
585  type = type_str;
586  ret = get_str(bc, str_value, sizeof(str_value));
587  } else if (value == -3) {
588  type = "s";
589  value = get_s(bc);
590  } else if (value == -4) {
591  type = "t";
592  value = ffio_read_varlen(bc);
593  } else if (value < -4) {
594  type = "r";
595  get_s(bc);
596  } else {
597  type = "v";
598  }
599 
600  if (ret < 0) {
601  av_log(s, AV_LOG_ERROR, "get_str failed while decoding info header\n");
602  return ret;
603  }
604 
605  if (stream_id_plus1 > s->nb_streams) {
607  "invalid stream id %d for info packet\n",
608  stream_id_plus1);
609  continue;
610  }
611 
612  if (!strcmp(type, "UTF-8")) {
613  if (chapter_id == 0 && !strcmp(name, "Disposition")) {
614  set_disposition_bits(s, str_value, stream_id_plus1 - 1);
615  continue;
616  }
617 
618  if (stream_id_plus1 && !strcmp(name, "r_frame_rate")) {
619  sscanf(str_value, "%d/%d", &st->r_frame_rate.num, &st->r_frame_rate.den);
620  if (st->r_frame_rate.num >= 1000LL*st->r_frame_rate.den ||
621  st->r_frame_rate.num < 0 || st->r_frame_rate.num < 0)
622  st->r_frame_rate.num = st->r_frame_rate.den = 0;
623  continue;
624  }
625 
626  if (metadata && av_strcasecmp(name, "Uses") &&
627  av_strcasecmp(name, "Depends") && av_strcasecmp(name, "Replaces")) {
628  if (event_flags)
629  *event_flags |= metadata_flag;
630  av_dict_set(metadata, name, str_value, 0);
631  }
632  }
633  }
634 
635  if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
636  av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n");
637  return AVERROR_INVALIDDATA;
638  }
639 fail:
640  return FFMIN(ret, 0);
641 }
642 
643 static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr)
644 {
645  AVFormatContext *s = nut->avf;
646  AVIOContext *bc = s->pb;
647  int64_t end;
648  uint64_t tmp;
649  int ret;
650 
651  nut->last_syncpoint_pos = avio_tell(bc) - 8;
652 
653  end = get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);
654  end += avio_tell(bc);
655 
656  tmp = ffio_read_varlen(bc);
657  *back_ptr = nut->last_syncpoint_pos - 16 * ffio_read_varlen(bc);
658  if (*back_ptr < 0)
659  return AVERROR_INVALIDDATA;
660 
661  ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count],
662  tmp / nut->time_base_count);
663 
664  if (nut->flags & NUT_BROADCAST) {
665  tmp = ffio_read_varlen(bc);
666  av_log(s, AV_LOG_VERBOSE, "Syncpoint wallclock %"PRId64"\n",
667  av_rescale_q(tmp / nut->time_base_count,
668  nut->time_base[tmp % nut->time_base_count],
669  AV_TIME_BASE_Q));
670  }
671 
672  if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
673  av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n");
674  return AVERROR_INVALIDDATA;
675  }
676 
677  *ts = tmp / nut->time_base_count *
678  av_q2d(nut->time_base[tmp % nut->time_base_count]) * AV_TIME_BASE;
679 
680  if ((ret = ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts)) < 0)
681  return ret;
682 
683  return 0;
684 }
685 
686 //FIXME calculate exactly, this is just a good approximation.
687 static int64_t find_duration(NUTContext *nut, int64_t filesize)
688 {
689  AVFormatContext *s = nut->avf;
690  int64_t duration = 0;
691 
692  ff_find_last_ts(s, -1, &duration, NULL, nut_read_timestamp);
693 
694  if(duration > 0)
696  return duration;
697 }
698 
700 {
701  AVFormatContext *s = nut->avf;
702  AVIOContext *bc = s->pb;
703  uint64_t tmp, end;
704  int i, j, syncpoint_count;
705  int64_t filesize = avio_size(bc);
706  int64_t *syncpoints = NULL;
707  uint64_t max_pts;
708  int8_t *has_keyframe = NULL;
709  int ret = AVERROR_INVALIDDATA;
710 
711  if(filesize <= 0)
712  return -1;
713 
714  avio_seek(bc, filesize - 12, SEEK_SET);
715  avio_seek(bc, filesize - avio_rb64(bc), SEEK_SET);
716  if (avio_rb64(bc) != INDEX_STARTCODE) {
717  av_log(s, AV_LOG_WARNING, "no index at the end\n");
718 
719  if(s->duration<=0)
720  s->duration = find_duration(nut, filesize);
721  return ret;
722  }
723 
724  end = get_packetheader(nut, bc, 1, INDEX_STARTCODE);
725  end += avio_tell(bc);
726 
727  max_pts = ffio_read_varlen(bc);
728  s->duration = av_rescale_q(max_pts / nut->time_base_count,
729  nut->time_base[max_pts % nut->time_base_count],
732 
733  GET_V(syncpoint_count, tmp < INT_MAX / 8 && tmp > 0);
734  syncpoints = av_malloc_array(syncpoint_count, sizeof(int64_t));
735  has_keyframe = av_malloc_array(syncpoint_count + 1, sizeof(int8_t));
736  if (!syncpoints || !has_keyframe) {
737  ret = AVERROR(ENOMEM);
738  goto fail;
739  }
740  for (i = 0; i < syncpoint_count; i++) {
741  syncpoints[i] = ffio_read_varlen(bc);
742  if (syncpoints[i] <= 0)
743  goto fail;
744  if (i)
745  syncpoints[i] += syncpoints[i - 1];
746  }
747 
748  for (i = 0; i < s->nb_streams; i++) {
749  int64_t last_pts = -1;
750  for (j = 0; j < syncpoint_count;) {
751  uint64_t x = ffio_read_varlen(bc);
752  int type = x & 1;
753  int n = j;
754  x >>= 1;
755  if (type) {
756  int flag = x & 1;
757  x >>= 1;
758  if (n + x >= syncpoint_count + 1) {
759  av_log(s, AV_LOG_ERROR, "index overflow A %d + %"PRIu64" >= %d\n", n, x, syncpoint_count + 1);
760  goto fail;
761  }
762  while (x--)
763  has_keyframe[n++] = flag;
764  has_keyframe[n++] = !flag;
765  } else {
766  if (x <= 1) {
767  av_log(s, AV_LOG_ERROR, "index: x %"PRIu64" is invalid\n", x);
768  goto fail;
769  }
770  while (x != 1) {
771  if (n >= syncpoint_count + 1) {
772  av_log(s, AV_LOG_ERROR, "index overflow B\n");
773  goto fail;
774  }
775  has_keyframe[n++] = x & 1;
776  x >>= 1;
777  }
778  }
779  if (has_keyframe[0]) {
780  av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n");
781  goto fail;
782  }
783  av_assert0(n <= syncpoint_count + 1);
784  for (; j < n && j < syncpoint_count; j++) {
785  if (has_keyframe[j]) {
786  uint64_t B, A = ffio_read_varlen(bc);
787  if (!A) {
788  A = ffio_read_varlen(bc);
789  B = ffio_read_varlen(bc);
790  // eor_pts[j][i] = last_pts + A + B
791  } else
792  B = 0;
793  av_add_index_entry(s->streams[i], 16 * syncpoints[j - 1],
794  last_pts + A, 0, 0, AVINDEX_KEYFRAME);
795  last_pts += A + B;
796  }
797  }
798  }
799  }
800 
801  if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
802  av_log(s, AV_LOG_ERROR, "index checksum mismatch\n");
803  goto fail;
804  }
805  ret = 0;
806 
807 fail:
808  av_free(syncpoints);
809  av_free(has_keyframe);
810  return ret;
811 }
812 
814 {
815  NUTContext *nut = s->priv_data;
816  int i;
817 
818  av_freep(&nut->time_base);
819  av_freep(&nut->stream);
820  ff_nut_free_sp(nut);
821  for (i = 1; i < nut->header_count; i++)
822  av_freep(&nut->header[i]);
823 
824  return 0;
825 }
826 
828 {
829  NUTContext *nut = s->priv_data;
830  AVIOContext *bc = s->pb;
831  int64_t pos;
832  int initialized_stream_count;
833 
834  nut->avf = s;
835 
836  /* main header */
837  pos = 0;
838  do {
839  pos = find_startcode(bc, MAIN_STARTCODE, pos) + 1;
840  if (pos < 0 + 1) {
841  av_log(s, AV_LOG_ERROR, "No main startcode found.\n");
842  goto fail;
843  }
844  } while (decode_main_header(nut) < 0);
845 
846  /* stream headers */
847  pos = 0;
848  for (initialized_stream_count = 0; initialized_stream_count < s->nb_streams;) {
849  pos = find_startcode(bc, STREAM_STARTCODE, pos) + 1;
850  if (pos < 0 + 1) {
851  av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n");
852  goto fail;
853  }
854  if (decode_stream_header(nut) >= 0)
855  initialized_stream_count++;
856  }
857 
858  /* info headers */
859  pos = 0;
860  for (;;) {
861  uint64_t startcode = find_any_startcode(bc, pos);
862  pos = avio_tell(bc);
863 
864  if (startcode == 0) {
865  av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
866  goto fail;
867  } else if (startcode == SYNCPOINT_STARTCODE) {
868  nut->next_startcode = startcode;
869  break;
870  } else if (startcode != INFO_STARTCODE) {
871  continue;
872  }
873 
874  decode_info_header(nut);
875  }
876 
877  s->internal->data_offset = pos - 8;
878 
879  if (bc->seekable) {
880  int64_t orig_pos = avio_tell(bc);
882  avio_seek(bc, orig_pos, SEEK_SET);
883  }
885 
887 
888  return 0;
889 
890 fail:
891  nut_read_close(s);
892 
893  return AVERROR_INVALIDDATA;
894 }
895 
896 static int read_sm_data(AVFormatContext *s, AVIOContext *bc, AVPacket *pkt, int is_meta, int64_t maxpos)
897 {
898  int count = ffio_read_varlen(bc);
899  int skip_start = 0;
900  int skip_end = 0;
901  int channels = 0;
902  int64_t channel_layout = 0;
903  int sample_rate = 0;
904  int width = 0;
905  int height = 0;
906  int i, ret;
907 
908  for (i=0; i<count; i++) {
909  uint8_t name[256], str_value[256], type_str[256];
910  int value;
911  if (avio_tell(bc) >= maxpos)
912  return AVERROR_INVALIDDATA;
913  ret = get_str(bc, name, sizeof(name));
914  if (ret < 0) {
915  av_log(s, AV_LOG_ERROR, "get_str failed while reading sm data\n");
916  return ret;
917  }
918  value = get_s(bc);
919 
920  if (value == -1) {
921  ret = get_str(bc, str_value, sizeof(str_value));
922  if (ret < 0) {
923  av_log(s, AV_LOG_ERROR, "get_str failed while reading sm data\n");
924  return ret;
925  }
926  av_log(s, AV_LOG_WARNING, "Unknown string %s / %s\n", name, str_value);
927  } else if (value == -2) {
928  uint8_t *dst = NULL;
929  int64_t v64, value_len;
930 
931  ret = get_str(bc, type_str, sizeof(type_str));
932  if (ret < 0) {
933  av_log(s, AV_LOG_ERROR, "get_str failed while reading sm data\n");
934  return ret;
935  }
936  value_len = ffio_read_varlen(bc);
937  if (value_len < 0 || value_len >= maxpos - avio_tell(bc))
938  return AVERROR_INVALIDDATA;
939  if (!strcmp(name, "Palette")) {
940  dst = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, value_len);
941  } else if (!strcmp(name, "Extradata")) {
942  dst = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, value_len);
943  } else if (sscanf(name, "CodecSpecificSide%"SCNd64"", &v64) == 1) {
945  if(!dst)
946  return AVERROR(ENOMEM);
947  AV_WB64(dst, v64);
948  dst += 8;
949  } else if (!strcmp(name, "ChannelLayout") && value_len == 8) {
950  channel_layout = avio_rl64(bc);
951  continue;
952  } else {
953  av_log(s, AV_LOG_WARNING, "Unknown data %s / %s\n", name, type_str);
954  avio_skip(bc, value_len);
955  continue;
956  }
957  if(!dst)
958  return AVERROR(ENOMEM);
959  avio_read(bc, dst, value_len);
960  } else if (value == -3) {
961  value = get_s(bc);
962  } else if (value == -4) {
963  value = ffio_read_varlen(bc);
964  } else if (value < -4) {
965  get_s(bc);
966  } else {
967  if (!strcmp(name, "SkipStart")) {
968  skip_start = value;
969  } else if (!strcmp(name, "SkipEnd")) {
970  skip_end = value;
971  } else if (!strcmp(name, "Channels")) {
972  channels = value;
973  } else if (!strcmp(name, "SampleRate")) {
974  sample_rate = value;
975  } else if (!strcmp(name, "Width")) {
976  width = value;
977  } else if (!strcmp(name, "Height")) {
978  height = value;
979  } else {
980  av_log(s, AV_LOG_WARNING, "Unknown integer %s\n", name);
981  }
982  }
983  }
984 
985  if (channels || channel_layout || sample_rate || width || height) {
987  if (!dst)
988  return AVERROR(ENOMEM);
989  bytestream_put_le32(&dst,
991  AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT*(!!channel_layout) +
992  AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE*(!!sample_rate) +
993  AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS*(!!(width|height))
994  );
995  if (channels)
996  bytestream_put_le32(&dst, channels);
997  if (channel_layout)
998  bytestream_put_le64(&dst, channel_layout);
999  if (sample_rate)
1000  bytestream_put_le32(&dst, sample_rate);
1001  if (width || height){
1002  bytestream_put_le32(&dst, width);
1003  bytestream_put_le32(&dst, height);
1004  }
1005  }
1006 
1007  if (skip_start || skip_end) {
1009  if (!dst)
1010  return AVERROR(ENOMEM);
1011  AV_WL32(dst, skip_start);
1012  AV_WL32(dst+4, skip_end);
1013  }
1014 
1015  if (avio_tell(bc) >= maxpos)
1016  return AVERROR_INVALIDDATA;
1017 
1018  return 0;
1019 }
1020 
1021 static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id,
1022  uint8_t *header_idx, int frame_code)
1023 {
1024  AVFormatContext *s = nut->avf;
1025  AVIOContext *bc = s->pb;
1026  StreamContext *stc;
1027  int size, flags, size_mul, pts_delta, i, reserved_count, ret;
1028  uint64_t tmp;
1029 
1030  if (!(nut->flags & NUT_PIPE) &&
1031  avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance) {
1032  av_log(s, AV_LOG_ERROR,
1033  "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n",
1034  avio_tell(bc), nut->last_syncpoint_pos, nut->max_distance);
1035  return AVERROR_INVALIDDATA;
1036  }
1037 
1038  flags = nut->frame_code[frame_code].flags;
1039  size_mul = nut->frame_code[frame_code].size_mul;
1040  size = nut->frame_code[frame_code].size_lsb;
1041  *stream_id = nut->frame_code[frame_code].stream_id;
1042  pts_delta = nut->frame_code[frame_code].pts_delta;
1043  reserved_count = nut->frame_code[frame_code].reserved_count;
1044  *header_idx = nut->frame_code[frame_code].header_idx;
1045 
1046  if (flags & FLAG_INVALID)
1047  return AVERROR_INVALIDDATA;
1048  if (flags & FLAG_CODED)
1049  flags ^= ffio_read_varlen(bc);
1050  if (flags & FLAG_STREAM_ID) {
1051  GET_V(*stream_id, tmp < s->nb_streams);
1052  }
1053  stc = &nut->stream[*stream_id];
1054  if (flags & FLAG_CODED_PTS) {
1055  int coded_pts = ffio_read_varlen(bc);
1056  // FIXME check last_pts validity?
1057  if (coded_pts < (1 << stc->msb_pts_shift)) {
1058  *pts = ff_lsb2full(stc, coded_pts);
1059  } else
1060  *pts = coded_pts - (1LL << stc->msb_pts_shift);
1061  } else
1062  *pts = stc->last_pts + pts_delta;
1063  if (flags & FLAG_SIZE_MSB)
1064  size += size_mul * ffio_read_varlen(bc);
1065  if (flags & FLAG_MATCH_TIME)
1066  get_s(bc);
1067  if (flags & FLAG_HEADER_IDX)
1068  *header_idx = ffio_read_varlen(bc);
1069  if (flags & FLAG_RESERVED)
1070  reserved_count = ffio_read_varlen(bc);
1071  for (i = 0; i < reserved_count; i++) {
1072  if (bc->eof_reached) {
1073  av_log(s, AV_LOG_ERROR, "reached EOF while decoding frame header\n");
1074  return AVERROR_INVALIDDATA;
1075  }
1076  ffio_read_varlen(bc);
1077  }
1078 
1079  if (*header_idx >= (unsigned)nut->header_count) {
1080  av_log(s, AV_LOG_ERROR, "header_idx invalid\n");
1081  return AVERROR_INVALIDDATA;
1082  }
1083  if (size > 4096)
1084  *header_idx = 0;
1085  size -= nut->header_len[*header_idx];
1086 
1087  if (flags & FLAG_CHECKSUM) {
1088  avio_rb32(bc); // FIXME check this
1089  } else if (!(nut->flags & NUT_PIPE) &&
1090  size > 2 * nut->max_distance ||
1091  FFABS(stc->last_pts - *pts) > stc->max_pts_distance) {
1092  av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n");
1093  return AVERROR_INVALIDDATA;
1094  }
1095 
1096  stc->last_pts = *pts;
1097  stc->last_flags = flags;
1098 
1099  return size;
1100 fail:
1101  return ret;
1102 }
1103 
1104 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code)
1105 {
1106  AVFormatContext *s = nut->avf;
1107  AVIOContext *bc = s->pb;
1108  int size, stream_id, discard, ret;
1109  int64_t pts, last_IP_pts;
1110  StreamContext *stc;
1111  uint8_t header_idx;
1112 
1113  size = decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code);
1114  if (size < 0)
1115  return size;
1116 
1117  stc = &nut->stream[stream_id];
1118 
1119  if (stc->last_flags & FLAG_KEY)
1120  stc->skip_until_key_frame = 0;
1121 
1122  discard = s->streams[stream_id]->discard;
1123  last_IP_pts = s->streams[stream_id]->last_IP_pts;
1124  if ((discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY)) ||
1125  (discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE &&
1126  last_IP_pts > pts) ||
1127  discard >= AVDISCARD_ALL ||
1128  stc->skip_until_key_frame) {
1129  avio_skip(bc, size);
1130  return 1;
1131  }
1132 
1133  ret = av_new_packet(pkt, size + nut->header_len[header_idx]);
1134  if (ret < 0)
1135  return ret;
1136  if (nut->header[header_idx])
1137  memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]);
1138  pkt->pos = avio_tell(bc); // FIXME
1139  if (stc->last_flags & FLAG_SM_DATA) {
1140  int sm_size;
1141  if (read_sm_data(s, bc, pkt, 0, pkt->pos + size) < 0) {
1142  ret = AVERROR_INVALIDDATA;
1143  goto fail;
1144  }
1145  if (read_sm_data(s, bc, pkt, 1, pkt->pos + size) < 0) {
1146  ret = AVERROR_INVALIDDATA;
1147  goto fail;
1148  }
1149  sm_size = avio_tell(bc) - pkt->pos;
1150  size -= sm_size;
1151  pkt->size -= sm_size;
1152  }
1153 
1154  ret = avio_read(bc, pkt->data + nut->header_len[header_idx], size);
1155  if (ret != size) {
1156  if (ret < 0)
1157  goto fail;
1158  }
1159  av_shrink_packet(pkt, nut->header_len[header_idx] + ret);
1160 
1161  pkt->stream_index = stream_id;
1162  if (stc->last_flags & FLAG_KEY)
1163  pkt->flags |= AV_PKT_FLAG_KEY;
1164  pkt->pts = pts;
1165 
1166  return 0;
1167 fail:
1168  av_packet_unref(pkt);
1169  return ret;
1170 }
1171 
1173 {
1174  NUTContext *nut = s->priv_data;
1175  AVIOContext *bc = s->pb;
1176  int i, frame_code = 0, ret, skip;
1177  int64_t ts, back_ptr;
1178 
1179  for (;;) {
1180  int64_t pos = avio_tell(bc);
1181  uint64_t tmp = nut->next_startcode;
1182  nut->next_startcode = 0;
1183 
1184  if (tmp) {
1185  pos -= 8;
1186  } else {
1187  frame_code = avio_r8(bc);
1188  if (avio_feof(bc))
1189  return AVERROR_EOF;
1190  if (frame_code == 'N') {
1191  tmp = frame_code;
1192  for (i = 1; i < 8; i++)
1193  tmp = (tmp << 8) + avio_r8(bc);
1194  }
1195  }
1196  switch (tmp) {
1197  case MAIN_STARTCODE:
1198  case STREAM_STARTCODE:
1199  case INDEX_STARTCODE:
1200  skip = get_packetheader(nut, bc, 0, tmp);
1201  avio_skip(bc, skip);
1202  break;
1203  case INFO_STARTCODE:
1204  if (decode_info_header(nut) < 0)
1205  goto resync;
1206  break;
1207  case SYNCPOINT_STARTCODE:
1208  if (decode_syncpoint(nut, &ts, &back_ptr) < 0)
1209  goto resync;
1210  frame_code = avio_r8(bc);
1211  case 0:
1212  ret = decode_frame(nut, pkt, frame_code);
1213  if (ret == 0)
1214  return 0;
1215  else if (ret == 1) // OK but discard packet
1216  break;
1217  default:
1218 resync:
1219  av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos);
1220  tmp = find_any_startcode(bc, FFMAX(nut->last_syncpoint_pos, nut->last_resync_pos) + 1);
1221  nut->last_resync_pos = avio_tell(bc);
1222  if (tmp == 0)
1223  return AVERROR_INVALIDDATA;
1224  av_log(s, AV_LOG_DEBUG, "sync\n");
1225  nut->next_startcode = tmp;
1226  }
1227  }
1228 }
1229 
1230 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,
1231  int64_t *pos_arg, int64_t pos_limit)
1232 {
1233  NUTContext *nut = s->priv_data;
1234  AVIOContext *bc = s->pb;
1235  int64_t pos, pts, back_ptr;
1236  av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n",
1237  stream_index, *pos_arg, pos_limit);
1238 
1239  pos = *pos_arg;
1240  do {
1241  pos = find_startcode(bc, SYNCPOINT_STARTCODE, pos) + 1;
1242  if (pos < 1) {
1243  av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n");
1244  return AV_NOPTS_VALUE;
1245  }
1246  } while (decode_syncpoint(nut, &pts, &back_ptr) < 0);
1247  *pos_arg = pos - 1;
1248  av_assert0(nut->last_syncpoint_pos == *pos_arg);
1249 
1250  av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts, back_ptr);
1251  if (stream_index == -2)
1252  return back_ptr;
1253  av_assert0(stream_index == -1);
1254  return pts;
1255 }
1256 
1257 static int read_seek(AVFormatContext *s, int stream_index,
1258  int64_t pts, int flags)
1259 {
1260  NUTContext *nut = s->priv_data;
1261  AVStream *st = s->streams[stream_index];
1262  Syncpoint dummy = { .ts = pts * av_q2d(st->time_base) * AV_TIME_BASE };
1263  Syncpoint nopts_sp = { .ts = AV_NOPTS_VALUE, .back_ptr = AV_NOPTS_VALUE };
1264  Syncpoint *sp, *next_node[2] = { &nopts_sp, &nopts_sp };
1265  int64_t pos, pos2, ts;
1266  int i;
1267 
1268  if (nut->flags & NUT_PIPE) {
1269  return AVERROR(ENOSYS);
1270  }
1271 
1272  if (st->index_entries) {
1273  int index = av_index_search_timestamp(st, pts, flags);
1274  if (index < 0)
1275  index = av_index_search_timestamp(st, pts, flags ^ AVSEEK_FLAG_BACKWARD);
1276  if (index < 0)
1277  return -1;
1278 
1279  pos2 = st->index_entries[index].pos;
1280  ts = st->index_entries[index].timestamp;
1281  } else {
1283  (void **) next_node);
1284  av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n",
1285  next_node[0]->pos, next_node[1]->pos, next_node[0]->ts,
1286  next_node[1]->ts);
1287  pos = ff_gen_search(s, -1, dummy.ts, next_node[0]->pos,
1288  next_node[1]->pos, next_node[1]->pos,
1289  next_node[0]->ts, next_node[1]->ts,
1291  if (pos < 0)
1292  return pos;
1293 
1294  if (!(flags & AVSEEK_FLAG_BACKWARD)) {
1295  dummy.pos = pos + 16;
1296  next_node[1] = &nopts_sp;
1298  (void **) next_node);
1299  pos2 = ff_gen_search(s, -2, dummy.pos, next_node[0]->pos,
1300  next_node[1]->pos, next_node[1]->pos,
1301  next_node[0]->back_ptr, next_node[1]->back_ptr,
1302  flags, &ts, nut_read_timestamp);
1303  if (pos2 >= 0)
1304  pos = pos2;
1305  // FIXME dir but I think it does not matter
1306  }
1307  dummy.pos = pos;
1308  sp = av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pos_cmp,
1309  NULL);
1310 
1311  av_assert0(sp);
1312  pos2 = sp->back_ptr - 15;
1313  }
1314  av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2);
1315  pos = find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2);
1316  avio_seek(s->pb, pos, SEEK_SET);
1317  nut->last_syncpoint_pos = pos;
1318  av_log(NULL, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos);
1319  if (pos2 > pos || pos2 + 15 < pos)
1320  av_log(NULL, AV_LOG_ERROR, "no syncpoint at backptr pos\n");
1321  for (i = 0; i < s->nb_streams; i++)
1322  nut->stream[i].skip_until_key_frame = 1;
1323 
1324  nut->last_resync_pos = 0;
1325 
1326  return 0;
1327 }
1328 
1330  .name = "nut",
1331  .long_name = NULL_IF_CONFIG_SMALL("NUT"),
1332  .flags = AVFMT_SEEK_TO_PTS,
1333  .priv_data_size = sizeof(NUTContext),
1334  .read_probe = nut_probe,
1338  .read_seek = read_seek,
1339  .extensions = "nut",
1340  .codec_tag = ff_nut_codec_tags,
1341 };
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:2366
uint8_t header_len[128]
Definition: nut.h:97
#define NULL
Definition: coverity.c:32
uint64_t ffio_read_varlen(AVIOContext *bc)
Definition: aviobuf.c:826
discard all frames except keyframes
Definition: avcodec.h:783
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:147
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define MAIN_STARTCODE
Definition: nut.h:29
void ff_metadata_conv_ctx(AVFormatContext *ctx, const AVMetadataConv *d_conv, const AVMetadataConv *s_conv)
Definition: metadata.c:59
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:309
#define AVSTREAM_EVENT_FLAG_METADATA_UPDATED
The call resulted in updated metadata.
Definition: avformat.h:995
int64_t last_syncpoint_pos
Definition: nut.h:104
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:1909
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:2955
enum AVDurationEstimationMethod duration_estimation_method
The duration field can be estimated through various ways, and this field can be used to know how the ...
Definition: avformat.h:1686
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1600
void av_shrink_packet(AVPacket *pkt, int size)
Reduce packet size, correctly zeroing padding.
Definition: avpacket.c:101
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:4436
const AVCodecTag ff_nut_audio_extra_tags[]
Definition: nut.c:188
int64_t pos
Definition: avformat.h:816
int event_flags
Flags for the user to detect events happening on the stream.
Definition: avformat.h:994
int64_t data_offset
offset of the first packet
Definition: internal.h:82
static int get_str(AVIOContext *bc, char *string, unsigned int maxlen)
Definition: nutdec.c:41
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3922
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:943
int num
numerator
Definition: rational.h:44
int size
Definition: avcodec.h:1581
int flag
Definition: cpu.c:34
Definition: vf_geq.c:46
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:230
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1074
AVFormatInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1752
Definition: nut.h:58
#define NUT_MAX_STREAMS
Definition: nutdec.c:36
int64_t ts
Definition: nut.h:62
int event_flags
Flags for the user to detect events happening on the file.
Definition: avformat.h:1614
static void set_disposition_bits(AVFormatContext *avf, char *value, int stream_id)
Definition: nutdec.c:505
void * av_tree_find(const AVTreeNode *t, void *key, int(*cmp)(const void *key, const void *b), void *next[2])
Definition: tree.c:39
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:304
discard all
Definition: avcodec.h:784
static AVPacket pkt
int ff_nut_sp_pos_cmp(const void *a, const void *b)
Definition: nut.c:247
uint8_t stream_id
Definition: nut.h:67
AVDictionary * metadata
Definition: avformat.h:1286
static int decode_main_header(NUTContext *nut)
Definition: nutdec.c:228
const uint8_t * header[128]
Definition: nut.h:98
AVChapter * avpriv_new_chapter(AVFormatContext *s, int id, AVRational time_base, int64_t start, int64_t end, const char *title)
Add a new chapter.
Definition: utils.c:4198
Format I/O context.
Definition: avformat.h:1325
static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id, uint8_t *header_idx, int frame_code)
Definition: nutdec.c:1021
#define AV_WB64(p, v)
Definition: intreadwrite.h:433
static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos_arg, int64_t pos_limit)
Definition: nutdec.c:1230
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
Public dictionary API.
uint8_t
AVRational * time_base
Definition: nut.h:107
static int nb_streams
Definition: ffprobe.c:254
#define av_malloc(s)
Opaque data information usually continuous.
Definition: avutil.h:195
int decode_delay
Definition: nut.h:83
int width
Video only.
Definition: avcodec.h:3988
uint16_t flags
Definition: nut.h:66
static int nut_probe(AVProbeData *p)
Definition: nutdec.c:188
A tree container.
enum AVCodecID av_codec_get_id(const struct AVCodecTag *const *tags, unsigned int tag)
Get the AVCodecID for the given codec tag tag.
const AVCodecTag ff_codec_movvideo_tags[]
Definition: isom.c:72
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:751
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
#define NUT_MAX_VERSION
Definition: nut.h:39
static int64_t last_pts
#define STREAM_STARTCODE
Definition: nut.h:30
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4074
int64_t last_resync_pos
Definition: nut.h:105
#define NUT_PIPE
Definition: nut.h:114
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:87
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1393
int64_t duration
Definition: movenc.c:63
const AVMetadataConv ff_nut_metadata_conv[]
Definition: nut.c:308
#define height
static double av_q2d(AVRational a)
Convert rational to double.
Definition: rational.h:80
uint8_t * data
Definition: avcodec.h:1580
int last_flags
Definition: nut.h:76
static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code)
Definition: nutdec.c:1104
int ff_nut_sp_pts_cmp(const void *a, const void *b)
Definition: nut.c:253
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define sp
Definition: regdef.h:63
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
const AVCodecTag ff_nut_data_tags[]
Definition: nut.c:36
ptrdiff_t size
Definition: opengl_enc.c:101
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:818
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:511
#define A(x)
Definition: vp56_arith.h:28
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:598
AVFormatContext * avf
Definition: nut.h:93
int64_t last_pts
Definition: nut.h:78
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1612
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
#define U(x)
Definition: vp56_arith.h:37
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:86
#define AVINDEX_KEYFRAME
Definition: avformat.h:823
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1539
void ff_nut_free_sp(NUTContext *nut)
Definition: nut.c:290
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2008
#define NUT_BROADCAST
Definition: nut.h:113
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:720
discard all bidirectional frames
Definition: avcodec.h:781
An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
Definition: avcodec.h:1368
#define AVERROR(e)
Definition: error.h:43
uint64_t pos
Definition: nut.h:59
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:817
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
int video_delay
Video only.
Definition: avcodec.h:4017
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3918
Definition: graph2dot.c:48
simple assert() macros that are a bit more flexible than ISO C assert().
int64_t av_gcd(int64_t a, int64_t b)
Compute the greatest common divisor of a and b.
Definition: mathematics.c:37
static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: nutdec.c:1172
const AVCodecTag ff_nut_audio_tags[]
Definition: nut.c:197
int header_count
Definition: nut.h:106
AVRational * time_base
Definition: nut.h:80
#define NUT_MIN_VERSION
Definition: nut.h:41
static int decode_stream_header(NUTContext *nut)
Definition: nutdec.c:398
#define av_be2ne64(x)
Definition: bswap.h:94
GLsizei count
Definition: opengl_enc.c:109
const AVCodecTag ff_codec_wav_tags[]
Definition: riff.c:432
#define FFMAX(a, b)
Definition: common.h:94
#define fail()
Definition: checkasm.h:81
Definition: nut.h:44
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1586
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3940
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:589
static int nut_read_close(AVFormatContext *s)
Definition: nutdec.c:813
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:462
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:461
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1381
void ffio_init_checksum(AVIOContext *s, unsigned long(*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum)
Definition: aviobuf.c:577
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:243
void ff_nut_reset_ts(NUTContext *nut, AVRational time_base, int64_t val)
Definition: nut.c:229
int flags
Definition: nut.h:115
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:246
#define FFMIN(a, b)
Definition: common.h:96
const AVCodecTag ff_codec_bmp_tags[]
Definition: riff.c:32
int av_strcasecmp(const char *a, const char *b)
Locale-independent case-insensitive compare.
Definition: avstring.c:213
uint8_t header_idx
Definition: nut.h:72
#define width
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos)
Definition: nutdec.c:145
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:109
uint16_t size_lsb
Definition: nut.h:69
unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len)
Definition: aviobuf.c:557
int16_t pts_delta
Definition: nut.h:70
static int find_and_decode_index(NUTContext *nut)
Definition: nutdec.c:699
int64_t ff_lsb2full(StreamContext *stream, int64_t lsb)
Definition: nut.c:240
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
static uint64_t get_fourcc(AVIOContext *bc)
Definition: nutdec.c:75
static int get_packetheader(NUTContext *nut, AVIOContext *bc, int calculate_checksum, uint64_t startcode)
Definition: nutdec.c:124
#define AVFMT_EVENT_FLAG_METADATA_UPDATED
The call resulted in updated metadata.
Definition: avformat.h:1615
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
struct AVTreeNode * syncpoints
Definition: nut.h:108
int n
Definition: avisynth_c.h:547
AVDictionary * metadata
Definition: avformat.h:945
int dummy
Definition: motion.c:64
static int nut_read_header(AVFormatContext *s)
Definition: nutdec.c:827
#define INDEX_STARTCODE
Definition: nut.h:32
uint16_t size_mul
Definition: nut.h:68
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:638
static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr)
Definition: nutdec.c:643
Stream structure.
Definition: avformat.h:876
int msb_pts_shift
Definition: nut.h:81
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
static int read_sm_data(AVFormatContext *s, AVIOContext *bc, AVPacket *pkt, int is_meta, int64_t maxpos)
Definition: nutdec.c:896
sample_rate
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
const AVCodecTag ff_nut_subtitle_tags[]
Definition: nut.c:28
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:252
AVIOContext * pb
I/O context.
Definition: avformat.h:1367
static int resync(AVFormatContext *s)
Definition: flvdec.c:804
int max_pts_distance
Definition: nut.h:82
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:563
Definition: nut.h:54
Data found in BlockAdditional element of matroska container.
Definition: avcodec.h:1487
GLint GLenum type
Definition: opengl_enc.c:105
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 GET_V(dst, check)
Definition: nutdec.c:201
int64_t ff_gen_search(AVFormatContext *s, int stream_index, int64_t target_ts, int64_t pos_min, int64_t pos_max, int64_t pos_limit, int64_t ts_min, int64_t ts_max, int flags, int64_t *ts_ret, int64_t(*read_timestamp)(struct AVFormatContext *, int, int64_t *, int64_t))
Perform a binary search using read_timestamp().
Definition: utils.c:2129
int index
Definition: gxfenc.c:89
rational number numerator/denominator
Definition: rational.h:43
Recommmends skipping the specified number of samples.
Definition: avcodec.h:1452
byte swapping routines
unsigned long ffio_get_checksum(AVIOContext *s)
Definition: aviobuf.c:569
int(* func)(AVBPrint *dst, const char *in, const char *arg)
Definition: jacosubdec.c:67
StreamContext * stream
Definition: nut.h:100
static int skip_reserved(AVIOContext *bc, int64_t pos)
Definition: nutdec.c:212
#define AVFMT_SEEK_TO_PTS
Seeking is based on PTS.
Definition: avformat.h:515
static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos)
Find the given startcode.
Definition: nutdec.c:176
This structure contains the data a format has to probe a file.
Definition: avformat.h:459
static int read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
Definition: nutdec.c:1257
int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos, int64_t(*read_timestamp)(struct AVFormatContext *, int, int64_t *, int64_t))
Definition: utils.c:2091
#define INFO_STARTCODE
Definition: nut.h:33
void * av_calloc(size_t nmemb, size_t size)
Allocate a block of nmemb * size bytes with alignment suitable for all memory accesses (including vec...
Definition: mem.c:260
static int64_t pts
Global timestamp for the audio frames.
int version
Definition: nut.h:116
static int flags
Definition: cpu.c:47
Duration accurately estimated from PTSes.
Definition: avformat.h:1304
int skip_until_key_frame
Definition: nut.h:77
static int64_t find_duration(NUTContext *nut, int64_t filesize)
Definition: nutdec.c:687
int sample_rate
Audio only.
Definition: avcodec.h:4032
const Dispositions ff_nut_dispositions[]
Definition: nut.c:298
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:471
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:704
uint64_t next_startcode
Definition: nut.h:99
static int decode_info_header(NUTContext *nut)
Definition: nutdec.c:520
FrameCode frame_code[256]
Definition: nut.h:96
int disposition
AV_DISPOSITION_* bit field.
Definition: avformat.h:934
int ff_get_extradata(AVFormatContext *s, AVCodecParameters *par, AVIOContext *pb, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0 and f...
Definition: utils.c:3137
static struct @229 state
const AVCodecTag ff_nut_video_tags[]
Definition: nut.c:41
int ff_nut_add_sp(NUTContext *nut, int64_t pos, int64_t back_ptr, int64_t ts)
Definition: nut.c:259
int den
denominator
Definition: rational.h:45
#define SYNCPOINT_STARTCODE
Definition: nut.h:31
int flag
Definition: nut.h:130
#define av_free(p)
int eof_reached
true if eof reached
Definition: avio.h:222
int len
AVInputFormat ff_nut_demuxer
Definition: nutdec.c:1329
static int64_t get_s(AVIOContext *bc)
Definition: nutdec.c:65
static uint8_t tmp[8]
Definition: des.c:38
void * priv_data
Format private data.
Definition: avformat.h:1353
int time_base_id
Definition: nut.h:79
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3936
int channels
Audio only.
Definition: avcodec.h:4028
int64_t duration
Duration of the stream, in AV_TIME_BASE fractional seconds.
Definition: avformat.h:1420
int64_t last_IP_pts
Definition: avformat.h:1049
#define av_freep(p)
void INT64 start
Definition: avisynth_c.h:553
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:660
AVCodecParameters * codecpar
Definition: avformat.h:1228
#define av_malloc_array(a, b)
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:328
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3926
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size)
Allocate new information of a packet.
Definition: avpacket.c:313
int stream_index
Definition: avcodec.h:1582
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:913
uint64_t back_ptr
Definition: nut.h:60
enum AVDiscard discard
Selects which packets can be discarded at will and do not need to be demuxed.
Definition: avformat.h:936
AVRational r_frame_rate
Real base framerate of the stream.
Definition: avformat.h:1090
const AVCodecTag *const ff_nut_codec_tags[]
Definition: nut.c:224
This structure stores compressed data.
Definition: avcodec.h:1557
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:728
unsigned int time_base_count
Definition: nut.h:103
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1573
int minor_version
Definition: nut.h:117
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:240
uint8_t reserved_count
Definition: nut.h:71
#define AV_WL32(p, v)
Definition: intreadwrite.h:426
const char * name
Definition: opengl_enc.c:103
unsigned int max_distance
Definition: nut.h:102