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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  return AVERROR_INVALIDDATA; \
207  } \
208  dst = tmp; \
209  } while (0)
210 
211 static int skip_reserved(AVIOContext *bc, int64_t pos)
212 {
213  pos -= avio_tell(bc);
214  if (pos < 0) {
215  avio_seek(bc, pos, SEEK_CUR);
216  return AVERROR_INVALIDDATA;
217  } else {
218  while (pos--) {
219  if (bc->eof_reached)
220  return AVERROR_INVALIDDATA;
221  avio_r8(bc);
222  }
223  return 0;
224  }
225 }
226 
228 {
229  AVFormatContext *s = nut->avf;
230  AVIOContext *bc = s->pb;
231  uint64_t tmp, end;
232  unsigned int stream_count;
233  int i, j, count;
234  int tmp_stream, tmp_mul, tmp_pts, tmp_size, tmp_res, tmp_head_idx;
235 
236  end = get_packetheader(nut, bc, 1, MAIN_STARTCODE);
237  end += avio_tell(bc);
238 
239  nut->version = ffio_read_varlen(bc);
240  if (nut->version < NUT_MIN_VERSION &&
241  nut->version > NUT_MAX_VERSION) {
242  av_log(s, AV_LOG_ERROR, "Version %d not supported.\n",
243  nut->version);
244  return AVERROR(ENOSYS);
245  }
246  if (nut->version > 3)
247  nut->minor_version = ffio_read_varlen(bc);
248 
249  GET_V(stream_count, tmp > 0 && tmp <= NUT_MAX_STREAMS);
250 
251  nut->max_distance = ffio_read_varlen(bc);
252  if (nut->max_distance > 65536) {
253  av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance);
254  nut->max_distance = 65536;
255  }
256 
257  GET_V(nut->time_base_count, tmp > 0 && tmp < INT_MAX / sizeof(AVRational));
258  nut->time_base = av_malloc(nut->time_base_count * sizeof(AVRational));
259  if (!nut->time_base)
260  return AVERROR(ENOMEM);
261 
262  for (i = 0; i < nut->time_base_count; i++) {
263  GET_V(nut->time_base[i].num, tmp > 0 && tmp < (1ULL << 31));
264  GET_V(nut->time_base[i].den, tmp > 0 && tmp < (1ULL << 31));
265  if (av_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1) {
266  av_log(s, AV_LOG_ERROR, "time base invalid\n");
267  return AVERROR_INVALIDDATA;
268  }
269  }
270  tmp_pts = 0;
271  tmp_mul = 1;
272  tmp_stream = 0;
273  tmp_head_idx = 0;
274  for (i = 0; i < 256;) {
275  int tmp_flags = ffio_read_varlen(bc);
276  int tmp_fields = ffio_read_varlen(bc);
277 
278  if (tmp_fields > 0)
279  tmp_pts = get_s(bc);
280  if (tmp_fields > 1)
281  tmp_mul = ffio_read_varlen(bc);
282  if (tmp_fields > 2)
283  tmp_stream = ffio_read_varlen(bc);
284  if (tmp_fields > 3)
285  tmp_size = ffio_read_varlen(bc);
286  else
287  tmp_size = 0;
288  if (tmp_fields > 4)
289  tmp_res = ffio_read_varlen(bc);
290  else
291  tmp_res = 0;
292  if (tmp_fields > 5)
293  count = ffio_read_varlen(bc);
294  else
295  count = tmp_mul - tmp_size;
296  if (tmp_fields > 6)
297  get_s(bc);
298  if (tmp_fields > 7)
299  tmp_head_idx = ffio_read_varlen(bc);
300 
301  while (tmp_fields-- > 8) {
302  if (bc->eof_reached) {
303  av_log(s, AV_LOG_ERROR, "reached EOF while decoding main header\n");
304  return AVERROR_INVALIDDATA;
305  }
306  ffio_read_varlen(bc);
307  }
308 
309  if (count <= 0 || count > 256 - (i <= 'N') - i) {
310  av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
311  return AVERROR_INVALIDDATA;
312  }
313  if (tmp_stream >= stream_count) {
314  av_log(s, AV_LOG_ERROR, "illegal stream number\n");
315  return AVERROR_INVALIDDATA;
316  }
317 
318  for (j = 0; j < count; j++, i++) {
319  if (i == 'N') {
320  nut->frame_code[i].flags = FLAG_INVALID;
321  j--;
322  continue;
323  }
324  nut->frame_code[i].flags = tmp_flags;
325  nut->frame_code[i].pts_delta = tmp_pts;
326  nut->frame_code[i].stream_id = tmp_stream;
327  nut->frame_code[i].size_mul = tmp_mul;
328  nut->frame_code[i].size_lsb = tmp_size + j;
329  nut->frame_code[i].reserved_count = tmp_res;
330  nut->frame_code[i].header_idx = tmp_head_idx;
331  }
332  }
333  av_assert0(nut->frame_code['N'].flags == FLAG_INVALID);
334 
335  if (end > avio_tell(bc) + 4) {
336  int rem = 1024;
337  GET_V(nut->header_count, tmp < 128U);
338  nut->header_count++;
339  for (i = 1; i < nut->header_count; i++) {
340  uint8_t *hdr;
341  GET_V(nut->header_len[i], tmp > 0 && tmp < 256);
342  rem -= nut->header_len[i];
343  if (rem < 0) {
344  av_log(s, AV_LOG_ERROR, "invalid elision header\n");
345  return AVERROR_INVALIDDATA;
346  }
347  hdr = av_malloc(nut->header_len[i]);
348  if (!hdr)
349  return AVERROR(ENOMEM);
350  avio_read(bc, hdr, nut->header_len[i]);
351  nut->header[i] = hdr;
352  }
353  av_assert0(nut->header_len[0] == 0);
354  }
355 
356  // flags had been effectively introduced in version 4
357  if (nut->version > 3 && end > avio_tell(bc) + 4) {
358  nut->flags = ffio_read_varlen(bc);
359  }
360 
361  if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
362  av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n");
363  return AVERROR_INVALIDDATA;
364  }
365 
366  nut->stream = av_calloc(stream_count, sizeof(StreamContext));
367  if (!nut->stream)
368  return AVERROR(ENOMEM);
369  for (i = 0; i < stream_count; i++)
371 
372  return 0;
373 }
374 
376 {
377  AVFormatContext *s = nut->avf;
378  AVIOContext *bc = s->pb;
379  StreamContext *stc;
380  int class, stream_id;
381  uint64_t tmp, end;
382  AVStream *st;
383 
384  end = get_packetheader(nut, bc, 1, STREAM_STARTCODE);
385  end += avio_tell(bc);
386 
387  GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base);
388  stc = &nut->stream[stream_id];
389  st = s->streams[stream_id];
390  if (!st)
391  return AVERROR(ENOMEM);
392 
393  class = ffio_read_varlen(bc);
394  tmp = get_fourcc(bc);
395  st->codec->codec_tag = tmp;
396  switch (class) {
397  case 0:
399  st->codec->codec_id = av_codec_get_id((const AVCodecTag * const []) {
403  0
404  },
405  tmp);
406  break;
407  case 1:
409  st->codec->codec_id = av_codec_get_id((const AVCodecTag * const []) {
413  0
414  },
415  tmp);
416  break;
417  case 2:
420  break;
421  case 3:
424  break;
425  default:
426  av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class);
427  return AVERROR(ENOSYS);
428  }
429  if (class < 3 && st->codec->codec_id == AV_CODEC_ID_NONE)
430  av_log(s, AV_LOG_ERROR,
431  "Unknown codec tag '0x%04x' for stream number %d\n",
432  (unsigned int) tmp, stream_id);
433 
434  GET_V(stc->time_base_id, tmp < nut->time_base_count);
435  GET_V(stc->msb_pts_shift, tmp < 16);
437  GET_V(stc->decode_delay, tmp < 1000); // sanity limit, raise this if Moore's law is true
438  st->codec->has_b_frames = stc->decode_delay;
439  ffio_read_varlen(bc); // stream flags
440 
441  GET_V(st->codec->extradata_size, tmp < (1 << 30));
442  if (st->codec->extradata_size) {
443  if (ff_get_extradata(st->codec, bc, st->codec->extradata_size) < 0)
444  return AVERROR(ENOMEM);
445  }
446 
447  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
448  GET_V(st->codec->width, tmp > 0);
449  GET_V(st->codec->height, tmp > 0);
452  if ((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)) {
453  av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n",
455  return AVERROR_INVALIDDATA;
456  }
457  ffio_read_varlen(bc); /* csp type */
458  } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
459  GET_V(st->codec->sample_rate, tmp > 0);
460  ffio_read_varlen(bc); // samplerate_den
461  GET_V(st->codec->channels, tmp > 0);
462  }
463  if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
464  av_log(s, AV_LOG_ERROR,
465  "stream header %d checksum mismatch\n", stream_id);
466  return AVERROR_INVALIDDATA;
467  }
468  stc->time_base = &nut->time_base[stc->time_base_id];
469  avpriv_set_pts_info(s->streams[stream_id], 63, stc->time_base->num,
470  stc->time_base->den);
471  return 0;
472 }
473 
475  int stream_id)
476 {
477  int flag = 0, i;
478 
479  for (i = 0; ff_nut_dispositions[i].flag; ++i)
480  if (!strcmp(ff_nut_dispositions[i].str, value))
481  flag = ff_nut_dispositions[i].flag;
482  if (!flag)
483  av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value);
484  for (i = 0; i < avf->nb_streams; ++i)
485  if (stream_id == i || stream_id == -1)
486  avf->streams[i]->disposition |= flag;
487 }
488 
490 {
491  AVFormatContext *s = nut->avf;
492  AVIOContext *bc = s->pb;
493  uint64_t tmp, chapter_start, chapter_len;
494  unsigned int stream_id_plus1, count;
495  int chapter_id, i, ret;
496  int64_t value, end;
497  char name[256], str_value[1024], type_str[256];
498  const char *type;
499  int *event_flags = NULL;
500  AVChapter *chapter = NULL;
501  AVStream *st = NULL;
502  AVDictionary **metadata = NULL;
503  int metadata_flag = 0;
504 
505  end = get_packetheader(nut, bc, 1, INFO_STARTCODE);
506  end += avio_tell(bc);
507 
508  GET_V(stream_id_plus1, tmp <= s->nb_streams);
509  chapter_id = get_s(bc);
510  chapter_start = ffio_read_varlen(bc);
511  chapter_len = ffio_read_varlen(bc);
512  count = ffio_read_varlen(bc);
513 
514  if (chapter_id && !stream_id_plus1) {
515  int64_t start = chapter_start / nut->time_base_count;
516  chapter = avpriv_new_chapter(s, chapter_id,
517  nut->time_base[chapter_start %
518  nut->time_base_count],
519  start, start + chapter_len, NULL);
520  if (!chapter) {
521  av_log(s, AV_LOG_ERROR, "could not create chapter\n");
522  return AVERROR(ENOMEM);
523  }
524  metadata = &chapter->metadata;
525  } else if (stream_id_plus1) {
526  st = s->streams[stream_id_plus1 - 1];
527  metadata = &st->metadata;
528  event_flags = &st->event_flags;
529  metadata_flag = AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
530  } else {
531  metadata = &s->metadata;
532  event_flags = &s->event_flags;
533  metadata_flag = AVFMT_EVENT_FLAG_METADATA_UPDATED;
534  }
535 
536  for (i = 0; i < count; i++) {
537  ret = get_str(bc, name, sizeof(name));
538  if (ret < 0) {
539  av_log(s, AV_LOG_ERROR, "get_str failed while decoding info header\n");
540  return ret;
541  }
542  value = get_s(bc);
543  str_value[0] = 0;
544 
545  if (value == -1) {
546  type = "UTF-8";
547  get_str(bc, str_value, sizeof(str_value));
548  } else if (value == -2) {
549  get_str(bc, type_str, sizeof(type_str));
550  type = type_str;
551  get_str(bc, str_value, sizeof(str_value));
552  } else if (value == -3) {
553  type = "s";
554  value = get_s(bc);
555  } else if (value == -4) {
556  type = "t";
557  value = ffio_read_varlen(bc);
558  } else if (value < -4) {
559  type = "r";
560  get_s(bc);
561  } else {
562  type = "v";
563  }
564 
565  if (stream_id_plus1 > s->nb_streams) {
566  av_log(s, AV_LOG_ERROR, "invalid stream id for info packet\n");
567  continue;
568  }
569 
570  if (!strcmp(type, "UTF-8")) {
571  if (chapter_id == 0 && !strcmp(name, "Disposition")) {
572  set_disposition_bits(s, str_value, stream_id_plus1 - 1);
573  continue;
574  }
575 
576  if (stream_id_plus1 && !strcmp(name, "r_frame_rate")) {
577  sscanf(str_value, "%d/%d", &st->r_frame_rate.num, &st->r_frame_rate.den);
578  if (st->r_frame_rate.num >= 1000LL*st->r_frame_rate.den ||
579  st->r_frame_rate.num < 0 || st->r_frame_rate.num < 0)
580  st->r_frame_rate.num = st->r_frame_rate.den = 0;
581  continue;
582  }
583 
584  if (metadata && av_strcasecmp(name, "Uses") &&
585  av_strcasecmp(name, "Depends") && av_strcasecmp(name, "Replaces")) {
586  if (event_flags)
587  *event_flags |= metadata_flag;
588  av_dict_set(metadata, name, str_value, 0);
589  }
590  }
591  }
592 
593  if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
594  av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n");
595  return AVERROR_INVALIDDATA;
596  }
597  return 0;
598 }
599 
600 static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr)
601 {
602  AVFormatContext *s = nut->avf;
603  AVIOContext *bc = s->pb;
604  int64_t end;
605  uint64_t tmp;
606  int ret;
607 
608  nut->last_syncpoint_pos = avio_tell(bc) - 8;
609 
610  end = get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);
611  end += avio_tell(bc);
612 
613  tmp = ffio_read_varlen(bc);
614  *back_ptr = nut->last_syncpoint_pos - 16 * ffio_read_varlen(bc);
615  if (*back_ptr < 0)
616  return AVERROR_INVALIDDATA;
617 
618  ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count],
619  tmp / nut->time_base_count);
620 
621  if (nut->flags & NUT_BROADCAST) {
622  tmp = ffio_read_varlen(bc);
623  av_log(s, AV_LOG_VERBOSE, "Syncpoint wallclock %"PRId64"\n",
624  av_rescale_q(tmp / nut->time_base_count,
625  nut->time_base[tmp % nut->time_base_count],
626  AV_TIME_BASE_Q));
627  }
628 
629  if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
630  av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n");
631  return AVERROR_INVALIDDATA;
632  }
633 
634  *ts = tmp / nut->time_base_count *
635  av_q2d(nut->time_base[tmp % nut->time_base_count]) * AV_TIME_BASE;
636 
637  if ((ret = ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts)) < 0)
638  return ret;
639 
640  return 0;
641 }
642 
643 //FIXME calculate exactly, this is just a good approximation.
644 static int64_t find_duration(NUTContext *nut, int64_t filesize)
645 {
646  AVFormatContext *s = nut->avf;
647  int64_t duration = 0;
648 
649  ff_find_last_ts(s, -1, &duration, NULL, nut_read_timestamp);
650 
651  if(duration > 0)
653  return duration;
654 }
655 
657 {
658  AVFormatContext *s = nut->avf;
659  AVIOContext *bc = s->pb;
660  uint64_t tmp, end;
661  int i, j, syncpoint_count;
662  int64_t filesize = avio_size(bc);
663  int64_t *syncpoints;
664  uint64_t max_pts;
665  int8_t *has_keyframe;
666  int ret = AVERROR_INVALIDDATA;
667 
668  if(filesize <= 0)
669  return -1;
670 
671  avio_seek(bc, filesize - 12, SEEK_SET);
672  avio_seek(bc, filesize - avio_rb64(bc), SEEK_SET);
673  if (avio_rb64(bc) != INDEX_STARTCODE) {
674  av_log(s, AV_LOG_ERROR, "no index at the end\n");
675 
676  if(s->duration<=0)
677  s->duration = find_duration(nut, filesize);
678  return ret;
679  }
680 
681  end = get_packetheader(nut, bc, 1, INDEX_STARTCODE);
682  end += avio_tell(bc);
683 
684  max_pts = ffio_read_varlen(bc);
685  s->duration = av_rescale_q(max_pts / nut->time_base_count,
686  nut->time_base[max_pts % nut->time_base_count],
689 
690  GET_V(syncpoint_count, tmp < INT_MAX / 8 && tmp > 0);
691  syncpoints = av_malloc_array(syncpoint_count, sizeof(int64_t));
692  has_keyframe = av_malloc_array(syncpoint_count + 1, sizeof(int8_t));
693  if (!syncpoints || !has_keyframe) {
694  ret = AVERROR(ENOMEM);
695  goto fail;
696  }
697  for (i = 0; i < syncpoint_count; i++) {
698  syncpoints[i] = ffio_read_varlen(bc);
699  if (syncpoints[i] <= 0)
700  goto fail;
701  if (i)
702  syncpoints[i] += syncpoints[i - 1];
703  }
704 
705  for (i = 0; i < s->nb_streams; i++) {
706  int64_t last_pts = -1;
707  for (j = 0; j < syncpoint_count;) {
708  uint64_t x = ffio_read_varlen(bc);
709  int type = x & 1;
710  int n = j;
711  x >>= 1;
712  if (type) {
713  int flag = x & 1;
714  x >>= 1;
715  if (n + x >= syncpoint_count + 1) {
716  av_log(s, AV_LOG_ERROR, "index overflow A %d + %"PRIu64" >= %d\n", n, x, syncpoint_count + 1);
717  goto fail;
718  }
719  while (x--)
720  has_keyframe[n++] = flag;
721  has_keyframe[n++] = !flag;
722  } else {
723  if (x <= 1) {
724  av_log(s, AV_LOG_ERROR, "index: x %"PRIu64" is invalid\n", x);
725  goto fail;
726  }
727  while (x != 1) {
728  if (n >= syncpoint_count + 1) {
729  av_log(s, AV_LOG_ERROR, "index overflow B\n");
730  goto fail;
731  }
732  has_keyframe[n++] = x & 1;
733  x >>= 1;
734  }
735  }
736  if (has_keyframe[0]) {
737  av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n");
738  goto fail;
739  }
740  av_assert0(n <= syncpoint_count + 1);
741  for (; j < n && j < syncpoint_count; j++) {
742  if (has_keyframe[j]) {
743  uint64_t B, A = ffio_read_varlen(bc);
744  if (!A) {
745  A = ffio_read_varlen(bc);
746  B = ffio_read_varlen(bc);
747  // eor_pts[j][i] = last_pts + A + B
748  } else
749  B = 0;
750  av_add_index_entry(s->streams[i], 16 * syncpoints[j - 1],
751  last_pts + A, 0, 0, AVINDEX_KEYFRAME);
752  last_pts += A + B;
753  }
754  }
755  }
756  }
757 
758  if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
759  av_log(s, AV_LOG_ERROR, "index checksum mismatch\n");
760  goto fail;
761  }
762  ret = 0;
763 
764 fail:
765  av_free(syncpoints);
766  av_free(has_keyframe);
767  return ret;
768 }
769 
770 static int nut_read_close(AVFormatContext *s);
771 
773 {
774  NUTContext *nut = s->priv_data;
775  AVIOContext *bc = s->pb;
776  int64_t pos;
777  int initialized_stream_count, ret = 0;
778 
779  nut->avf = s;
780 
781  /* main header */
782  pos = 0;
783  do {
784  pos = find_startcode(bc, MAIN_STARTCODE, pos) + 1;
785  if (pos < 0 + 1) {
786  av_log(s, AV_LOG_ERROR, "No main startcode found.\n");
787  ret = AVERROR_INVALIDDATA;
788  goto end;
789  }
790  } while (decode_main_header(nut) < 0);
791 
792  /* stream headers */
793  pos = 0;
794  for (initialized_stream_count = 0; initialized_stream_count < s->nb_streams;) {
795  pos = find_startcode(bc, STREAM_STARTCODE, pos) + 1;
796  if (pos < 0 + 1) {
797  av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n");
798  ret = AVERROR_INVALIDDATA;
799  goto end;
800  }
801  if (decode_stream_header(nut) >= 0)
802  initialized_stream_count++;
803  }
804 
805  /* info headers */
806  pos = 0;
807  for (;;) {
808  uint64_t startcode = find_any_startcode(bc, pos);
809  pos = avio_tell(bc);
810 
811  if (startcode == 0) {
812  av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
813  ret = AVERROR_INVALIDDATA;
814  goto end;
815  } else if (startcode == SYNCPOINT_STARTCODE) {
816  nut->next_startcode = startcode;
817  break;
818  } else if (startcode != INFO_STARTCODE) {
819  continue;
820  }
821 
822  decode_info_header(nut);
823  }
824 
825  s->internal->data_offset = pos - 8;
826 
827  if (bc->seekable) {
828  int64_t orig_pos = avio_tell(bc);
830  avio_seek(bc, orig_pos, SEEK_SET);
831  }
833 
835 
836 end:
837  if (ret < 0)
838  nut_read_close(s);
839  return FFMIN(ret, 0);
840 }
841 
842 static int read_sm_data(AVFormatContext *s, AVIOContext *bc, AVPacket *pkt, int is_meta, int64_t maxpos)
843 {
844  int count = ffio_read_varlen(bc);
845  int skip_start = 0;
846  int skip_end = 0;
847  int channels = 0;
848  int64_t channel_layout = 0;
849  int sample_rate = 0;
850  int width = 0;
851  int height = 0;
852  int i, ret;
853 
854  for (i=0; i<count; i++) {
855  uint8_t name[256], str_value[256], type_str[256];
856  int value;
857  if (avio_tell(bc) >= maxpos)
858  return AVERROR_INVALIDDATA;
859  ret = get_str(bc, name, sizeof(name));
860  if (ret < 0) {
861  av_log(s, AV_LOG_ERROR, "get_str failed while reading sm data\n");
862  return ret;
863  }
864  value = get_s(bc);
865 
866  if (value == -1) {
867  get_str(bc, str_value, sizeof(str_value));
868  av_log(s, AV_LOG_WARNING, "Unknown string %s / %s\n", name, str_value);
869  } else if (value == -2) {
870  uint8_t *dst = NULL;
871  int64_t v64, value_len;
872 
873  get_str(bc, type_str, sizeof(type_str));
874  value_len = ffio_read_varlen(bc);
875  if (value_len < 0 || value_len >= maxpos - avio_tell(bc))
876  return AVERROR_INVALIDDATA;
877  if (!strcmp(name, "Palette")) {
878  dst = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, value_len);
879  } else if (!strcmp(name, "Extradata")) {
880  dst = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, value_len);
881  } else if (sscanf(name, "CodecSpecificSide%"SCNd64"", &v64) == 1) {
883  if(!dst)
884  return AVERROR(ENOMEM);
885  AV_WB64(dst, v64);
886  dst += 8;
887  } else if (!strcmp(name, "ChannelLayout") && value_len == 8) {
888  channel_layout = avio_rl64(bc);
889  continue;
890  } else {
891  av_log(s, AV_LOG_WARNING, "Unknown data %s / %s\n", name, type_str);
892  avio_skip(bc, value_len);
893  continue;
894  }
895  if(!dst)
896  return AVERROR(ENOMEM);
897  avio_read(bc, dst, value_len);
898  } else if (value == -3) {
899  value = get_s(bc);
900  } else if (value == -4) {
901  value = ffio_read_varlen(bc);
902  } else if (value < -4) {
903  get_s(bc);
904  } else {
905  if (!strcmp(name, "SkipStart")) {
906  skip_start = value;
907  } else if (!strcmp(name, "SkipEnd")) {
908  skip_end = value;
909  } else if (!strcmp(name, "Channels")) {
910  channels = value;
911  } else if (!strcmp(name, "SampleRate")) {
912  sample_rate = value;
913  } else if (!strcmp(name, "Width")) {
914  width = value;
915  } else if (!strcmp(name, "Height")) {
916  height = value;
917  } else {
918  av_log(s, AV_LOG_WARNING, "Unknown integer %s\n", name);
919  }
920  }
921  }
922 
923  if (channels || channel_layout || sample_rate || width || height) {
925  if (!dst)
926  return AVERROR(ENOMEM);
927  bytestream_put_le32(&dst,
929  AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT*(!!channel_layout) +
930  AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE*(!!sample_rate) +
931  AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS*(!!(width|height))
932  );
933  if (channels)
934  bytestream_put_le32(&dst, channels);
935  if (channel_layout)
936  bytestream_put_le64(&dst, channel_layout);
937  if (sample_rate)
938  bytestream_put_le32(&dst, sample_rate);
939  if (width || height){
940  bytestream_put_le32(&dst, width);
941  bytestream_put_le32(&dst, height);
942  }
943  }
944 
945  if (skip_start || skip_end) {
947  if (!dst)
948  return AVERROR(ENOMEM);
949  AV_WL32(dst, skip_start);
950  AV_WL32(dst+4, skip_end);
951  }
952 
953  if (avio_tell(bc) >= maxpos)
954  return AVERROR_INVALIDDATA;
955 
956  return 0;
957 }
958 
959 static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id,
960  uint8_t *header_idx, int frame_code)
961 {
962  AVFormatContext *s = nut->avf;
963  AVIOContext *bc = s->pb;
964  StreamContext *stc;
965  int size, flags, size_mul, pts_delta, i, reserved_count;
966  uint64_t tmp;
967 
968  if (!(nut->flags & NUT_PIPE) &&
969  avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance) {
970  av_log(s, AV_LOG_ERROR,
971  "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n",
972  avio_tell(bc), nut->last_syncpoint_pos, nut->max_distance);
973  return AVERROR_INVALIDDATA;
974  }
975 
976  flags = nut->frame_code[frame_code].flags;
977  size_mul = nut->frame_code[frame_code].size_mul;
978  size = nut->frame_code[frame_code].size_lsb;
979  *stream_id = nut->frame_code[frame_code].stream_id;
980  pts_delta = nut->frame_code[frame_code].pts_delta;
981  reserved_count = nut->frame_code[frame_code].reserved_count;
982  *header_idx = nut->frame_code[frame_code].header_idx;
983 
984  if (flags & FLAG_INVALID)
985  return AVERROR_INVALIDDATA;
986  if (flags & FLAG_CODED)
987  flags ^= ffio_read_varlen(bc);
988  if (flags & FLAG_STREAM_ID) {
989  GET_V(*stream_id, tmp < s->nb_streams);
990  }
991  stc = &nut->stream[*stream_id];
992  if (flags & FLAG_CODED_PTS) {
993  int coded_pts = ffio_read_varlen(bc);
994  // FIXME check last_pts validity?
995  if (coded_pts < (1 << stc->msb_pts_shift)) {
996  *pts = ff_lsb2full(stc, coded_pts);
997  } else
998  *pts = coded_pts - (1LL << stc->msb_pts_shift);
999  } else
1000  *pts = stc->last_pts + pts_delta;
1001  if (flags & FLAG_SIZE_MSB)
1002  size += size_mul * ffio_read_varlen(bc);
1003  if (flags & FLAG_MATCH_TIME)
1004  get_s(bc);
1005  if (flags & FLAG_HEADER_IDX)
1006  *header_idx = ffio_read_varlen(bc);
1007  if (flags & FLAG_RESERVED)
1008  reserved_count = ffio_read_varlen(bc);
1009  for (i = 0; i < reserved_count; i++) {
1010  if (bc->eof_reached) {
1011  av_log(s, AV_LOG_ERROR, "reached EOF while decoding frame header\n");
1012  return AVERROR_INVALIDDATA;
1013  }
1014  ffio_read_varlen(bc);
1015  }
1016 
1017  if (*header_idx >= (unsigned)nut->header_count) {
1018  av_log(s, AV_LOG_ERROR, "header_idx invalid\n");
1019  return AVERROR_INVALIDDATA;
1020  }
1021  if (size > 4096)
1022  *header_idx = 0;
1023  size -= nut->header_len[*header_idx];
1024 
1025  if (flags & FLAG_CHECKSUM) {
1026  avio_rb32(bc); // FIXME check this
1027  } else if (!(nut->flags & NUT_PIPE) &&
1028  size > 2 * nut->max_distance ||
1029  FFABS(stc->last_pts - *pts) > stc->max_pts_distance) {
1030  av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n");
1031  return AVERROR_INVALIDDATA;
1032  }
1033 
1034  stc->last_pts = *pts;
1035  stc->last_flags = flags;
1036 
1037  return size;
1038 }
1039 
1040 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code)
1041 {
1042  AVFormatContext *s = nut->avf;
1043  AVIOContext *bc = s->pb;
1044  int size, stream_id, discard, ret;
1045  int64_t pts, last_IP_pts;
1046  StreamContext *stc;
1047  uint8_t header_idx;
1048 
1049  size = decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code);
1050  if (size < 0)
1051  return size;
1052 
1053  stc = &nut->stream[stream_id];
1054 
1055  if (stc->last_flags & FLAG_KEY)
1056  stc->skip_until_key_frame = 0;
1057 
1058  discard = s->streams[stream_id]->discard;
1059  last_IP_pts = s->streams[stream_id]->last_IP_pts;
1060  if ((discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY)) ||
1061  (discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE &&
1062  last_IP_pts > pts) ||
1063  discard >= AVDISCARD_ALL ||
1064  stc->skip_until_key_frame) {
1065  avio_skip(bc, size);
1066  return 1;
1067  }
1068 
1069  ret = av_new_packet(pkt, size + nut->header_len[header_idx]);
1070  if (ret < 0)
1071  return ret;
1072  if (nut->header[header_idx])
1073  memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]);
1074  pkt->pos = avio_tell(bc); // FIXME
1075  if (stc->last_flags & FLAG_SM_DATA) {
1076  int sm_size;
1077  if (read_sm_data(s, bc, pkt, 0, pkt->pos + size) < 0)
1078  return AVERROR_INVALIDDATA;
1079  if (read_sm_data(s, bc, pkt, 1, pkt->pos + size) < 0)
1080  return AVERROR_INVALIDDATA;
1081  sm_size = avio_tell(bc) - pkt->pos;
1082  size -= sm_size;
1083  pkt->size -= sm_size;
1084  }
1085 
1086  ret = avio_read(bc, pkt->data + nut->header_len[header_idx], size);
1087  if (ret != size) {
1088  if (ret < 0)
1089  return ret;
1090  }
1091  av_shrink_packet(pkt, nut->header_len[header_idx] + ret);
1092 
1093  pkt->stream_index = stream_id;
1094  if (stc->last_flags & FLAG_KEY)
1095  pkt->flags |= AV_PKT_FLAG_KEY;
1096  pkt->pts = pts;
1097 
1098  return 0;
1099 }
1100 
1102 {
1103  NUTContext *nut = s->priv_data;
1104  AVIOContext *bc = s->pb;
1105  int i, frame_code = 0, ret, skip;
1106  int64_t ts, back_ptr;
1107 
1108  for (;;) {
1109  int64_t pos = avio_tell(bc);
1110  uint64_t tmp = nut->next_startcode;
1111  nut->next_startcode = 0;
1112 
1113  if (tmp) {
1114  pos -= 8;
1115  } else {
1116  frame_code = avio_r8(bc);
1117  if (avio_feof(bc))
1118  return AVERROR_EOF;
1119  if (frame_code == 'N') {
1120  tmp = frame_code;
1121  for (i = 1; i < 8; i++)
1122  tmp = (tmp << 8) + avio_r8(bc);
1123  }
1124  }
1125  switch (tmp) {
1126  case MAIN_STARTCODE:
1127  case STREAM_STARTCODE:
1128  case INDEX_STARTCODE:
1129  skip = get_packetheader(nut, bc, 0, tmp);
1130  avio_skip(bc, skip);
1131  break;
1132  case INFO_STARTCODE:
1133  if (decode_info_header(nut) < 0)
1134  goto resync;
1135  break;
1136  case SYNCPOINT_STARTCODE:
1137  if (decode_syncpoint(nut, &ts, &back_ptr) < 0)
1138  goto resync;
1139  frame_code = avio_r8(bc);
1140  case 0:
1141  ret = decode_frame(nut, pkt, frame_code);
1142  if (ret == 0)
1143  return 0;
1144  else if (ret == 1) // OK but discard packet
1145  break;
1146  default:
1147 resync:
1148  av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos);
1149  tmp = find_any_startcode(bc, FFMAX(nut->last_syncpoint_pos, nut->last_resync_pos) + 1);
1150  nut->last_resync_pos = avio_tell(bc);
1151  if (tmp == 0)
1152  return AVERROR_INVALIDDATA;
1153  av_log(s, AV_LOG_DEBUG, "sync\n");
1154  nut->next_startcode = tmp;
1155  }
1156  }
1157 }
1158 
1159 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,
1160  int64_t *pos_arg, int64_t pos_limit)
1161 {
1162  NUTContext *nut = s->priv_data;
1163  AVIOContext *bc = s->pb;
1164  int64_t pos, pts, back_ptr;
1165  av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n",
1166  stream_index, *pos_arg, pos_limit);
1167 
1168  pos = *pos_arg;
1169  do {
1170  pos = find_startcode(bc, SYNCPOINT_STARTCODE, pos) + 1;
1171  if (pos < 1) {
1172  av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n");
1173  return AV_NOPTS_VALUE;
1174  }
1175  } while (decode_syncpoint(nut, &pts, &back_ptr) < 0);
1176  *pos_arg = pos - 1;
1177  av_assert0(nut->last_syncpoint_pos == *pos_arg);
1178 
1179  av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts, back_ptr);
1180  if (stream_index == -2)
1181  return back_ptr;
1182  av_assert0(stream_index == -1);
1183  return pts;
1184 }
1185 
1186 static int read_seek(AVFormatContext *s, int stream_index,
1187  int64_t pts, int flags)
1188 {
1189  NUTContext *nut = s->priv_data;
1190  AVStream *st = s->streams[stream_index];
1191  Syncpoint dummy = { .ts = pts * av_q2d(st->time_base) * AV_TIME_BASE };
1192  Syncpoint nopts_sp = { .ts = AV_NOPTS_VALUE, .back_ptr = AV_NOPTS_VALUE };
1193  Syncpoint *sp, *next_node[2] = { &nopts_sp, &nopts_sp };
1194  int64_t pos, pos2, ts;
1195  int i;
1196 
1197  if (nut->flags & NUT_PIPE) {
1198  return AVERROR(ENOSYS);
1199  }
1200 
1201  if (st->index_entries) {
1202  int index = av_index_search_timestamp(st, pts, flags);
1203  if (index < 0)
1204  index = av_index_search_timestamp(st, pts, flags ^ AVSEEK_FLAG_BACKWARD);
1205  if (index < 0)
1206  return -1;
1207 
1208  pos2 = st->index_entries[index].pos;
1209  ts = st->index_entries[index].timestamp;
1210  } else {
1211  av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pts_cmp,
1212  (void **) next_node);
1213  av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n",
1214  next_node[0]->pos, next_node[1]->pos, next_node[0]->ts,
1215  next_node[1]->ts);
1216  pos = ff_gen_search(s, -1, dummy.ts, next_node[0]->pos,
1217  next_node[1]->pos, next_node[1]->pos,
1218  next_node[0]->ts, next_node[1]->ts,
1220 
1221  if (!(flags & AVSEEK_FLAG_BACKWARD)) {
1222  dummy.pos = pos + 16;
1223  next_node[1] = &nopts_sp;
1224  av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
1225  (void **) next_node);
1226  pos2 = ff_gen_search(s, -2, dummy.pos, next_node[0]->pos,
1227  next_node[1]->pos, next_node[1]->pos,
1228  next_node[0]->back_ptr, next_node[1]->back_ptr,
1229  flags, &ts, nut_read_timestamp);
1230  if (pos2 >= 0)
1231  pos = pos2;
1232  // FIXME dir but I think it does not matter
1233  }
1234  dummy.pos = pos;
1235  sp = av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
1236  NULL);
1237 
1238  av_assert0(sp);
1239  pos2 = sp->back_ptr - 15;
1240  }
1241  av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2);
1242  pos = find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2);
1243  avio_seek(s->pb, pos, SEEK_SET);
1244  nut->last_syncpoint_pos = pos;
1245  av_log(NULL, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos);
1246  if (pos2 > pos || pos2 + 15 < pos)
1247  av_log(NULL, AV_LOG_ERROR, "no syncpoint at backptr pos\n");
1248  for (i = 0; i < s->nb_streams; i++)
1249  nut->stream[i].skip_until_key_frame = 1;
1250 
1251  nut->last_resync_pos = 0;
1252 
1253  return 0;
1254 }
1255 
1257 {
1258  NUTContext *nut = s->priv_data;
1259  int i;
1260 
1261  av_freep(&nut->time_base);
1262  av_freep(&nut->stream);
1263  ff_nut_free_sp(nut);
1264  for (i = 1; i < nut->header_count; i++)
1265  av_freep(&nut->header[i]);
1266 
1267  return 0;
1268 }
1269 
1271  .name = "nut",
1272  .long_name = NULL_IF_CONFIG_SMALL("NUT"),
1273  .flags = AVFMT_SEEK_TO_PTS,
1274  .priv_data_size = sizeof(NUTContext),
1275  .read_probe = nut_probe,
1279  .read_seek = read_seek,
1280  .extensions = "nut",
1281  .codec_tag = ff_nut_codec_tags,
1282 };