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tools/sofa2wavs: fix build on Windows
[ffmpeg.git] / libavformat / nutdec.c
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/mem.h"
30 #include "libavutil/tree.h"
31 #include "libavcodec/bytestream.h"
32 #include "avio_internal.h"
33 #include "demux.h"
34 #include "isom.h"
35 #include "nut.h"
36 #include "riff.h"
37
38 #define NUT_MAX_STREAMS 256 /* arbitrary sanity check value */
39
40 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,
41 int64_t *pos_arg, int64_t pos_limit);
42
43 static int get_str(AVIOContext *bc, char *string, unsigned int maxlen)
44 {
45 unsigned int len = ffio_read_varlen(bc);
46
47 if (len && maxlen)
48 avio_read(bc, string, FFMIN(len, maxlen));
49 while (len > maxlen) {
50 avio_r8(bc);
51 len--;
52 if (bc->eof_reached)
53 len = maxlen;
54 }
55
56 if (maxlen)
57 string[FFMIN(len, maxlen - 1)] = 0;
58
59 if (bc->eof_reached)
60 return AVERROR_EOF;
61 if (maxlen == len)
62 return -1;
63 else
64 return 0;
65 }
66
67 static int64_t get_s(AVIOContext *bc)
68 {
69 int64_t v = ffio_read_varlen(bc) + 1;
70
71 if (v & 1)
72 return -(v >> 1);
73 else
74 return (v >> 1);
75 }
76
77 static uint64_t get_fourcc(AVIOContext *bc)
78 {
79 unsigned int len = ffio_read_varlen(bc);
80
81 if (len == 2)
82 return avio_rl16(bc);
83 else if (len == 4)
84 return avio_rl32(bc);
85 else {
86 av_log(NULL, AV_LOG_ERROR, "Unsupported fourcc length %d\n", len);
87 return -1;
88 }
89 }
90
91 static int get_packetheader(NUTContext *nut, AVIOContext *bc,
92 int calculate_checksum, uint64_t startcode)
93 {
94 int64_t size;
95
96 startcode = av_be2ne64(startcode);
97 startcode = ff_crc04C11DB7_update(0, (uint8_t*) &startcode, 8);
98
99 ffio_init_checksum(bc, ff_crc04C11DB7_update, startcode);
100 size = ffio_read_varlen(bc);
101 if (size > 4096)
102 avio_rb32(bc);
103 if (ffio_get_checksum(bc) && size > 4096)
104 return -1;
105
106 ffio_init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0);
107
108 return size;
109 }
110
111 static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos)
112 {
113 uint64_t state = 0;
114
115 if (pos >= 0)
116 /* Note, this may fail if the stream is not seekable, but that should
117 * not matter, as in this case we simply start where we currently are */
118 avio_seek(bc, pos, SEEK_SET);
119 while (!avio_feof(bc)) {
120 state = (state << 8) | avio_r8(bc);
121 if ((state >> 56) != 'N')
122 continue;
123 switch (state) {
124 case MAIN_STARTCODE:
125 case STREAM_STARTCODE:
126 case SYNCPOINT_STARTCODE:
127 case INFO_STARTCODE:
128 case INDEX_STARTCODE:
129 return state;
130 }
131 }
132
133 return 0;
134 }
135
136 /**
137 * Find the given startcode.
138 * @param code the startcode
139 * @param pos the start position of the search, or -1 if the current position
140 * @return the position of the startcode or -1 if not found
141 */
142 static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos)
143 {
144 for (;;) {
145 uint64_t startcode = find_any_startcode(bc, pos);
146 if (startcode == code)
147 return avio_tell(bc) - 8;
148 else if (startcode == 0)
149 return -1;
150 pos = -1;
151 }
152 }
153
154 static int nut_probe(const AVProbeData *p)
155 {
156 int i;
157
158 for (i = 0; i < p->buf_size-8; i++) {
159 if (AV_RB32(p->buf+i) != MAIN_STARTCODE>>32)
160 continue;
161 if (AV_RB32(p->buf+i+4) == (MAIN_STARTCODE & 0xFFFFFFFF))
162 return AVPROBE_SCORE_MAX;
163 }
164 return 0;
165 }
166
167 #define GET_V(dst, check) \
168 do { \
169 tmp = ffio_read_varlen(bc); \
170 if (!(check)) { \
171 av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp); \
172 ret = AVERROR_INVALIDDATA; \
173 goto fail; \
174 } \
175 dst = tmp; \
176 } while (0)
177
178 static int skip_reserved(AVIOContext *bc, int64_t pos)
179 {
180 pos -= avio_tell(bc);
181 if (pos < 0) {
182 avio_seek(bc, pos, SEEK_CUR);
183 return AVERROR_INVALIDDATA;
184 } else {
185 while (pos--) {
186 if (bc->eof_reached)
187 return AVERROR_INVALIDDATA;
188 avio_r8(bc);
189 }
190 return 0;
191 }
192 }
193
194 static int decode_main_header(NUTContext *nut)
195 {
196 AVFormatContext *s = nut->avf;
197 AVIOContext *bc = s->pb;
198 uint64_t tmp, end, length;
199 unsigned int stream_count;
200 int i, j, count, ret;
201 int tmp_stream, tmp_mul, tmp_pts, tmp_size, tmp_res, tmp_head_idx;
202
203 length = get_packetheader(nut, bc, 1, MAIN_STARTCODE);
204 if (length == (uint64_t)-1)
205 return AVERROR_INVALIDDATA;
206 end = length + avio_tell(bc);
207
208 nut->version = ffio_read_varlen(bc);
209 if (nut->version < NUT_MIN_VERSION ||
210 nut->version > NUT_MAX_VERSION) {
211 av_log(s, AV_LOG_ERROR, "Version %d not supported.\n",
212 nut->version);
213 return AVERROR(ENOSYS);
214 }
215 if (nut->version > 3)
216 nut->minor_version = ffio_read_varlen(bc);
217
218 GET_V(stream_count, tmp > 0 && tmp <= NUT_MAX_STREAMS);
219
220 nut->max_distance = ffio_read_varlen(bc);
221 if (nut->max_distance > 65536) {
222 av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance);
223 nut->max_distance = 65536;
224 }
225
226 GET_V(nut->time_base_count, tmp > 0 && tmp < INT_MAX / sizeof(AVRational) && tmp < length/2);
227 nut->time_base = av_malloc_array(nut->time_base_count, sizeof(AVRational));
228 if (!nut->time_base)
229 return AVERROR(ENOMEM);
230
231 for (i = 0; i < nut->time_base_count; i++) {
232 GET_V(nut->time_base[i].num, tmp > 0 && tmp < (1ULL << 31));
233 GET_V(nut->time_base[i].den, tmp > 0 && tmp < (1ULL << 31));
234 if (av_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1) {
235 av_log(s, AV_LOG_ERROR, "invalid time base %d/%d\n",
236 nut->time_base[i].num,
237 nut->time_base[i].den);
238 ret = AVERROR_INVALIDDATA;
239 goto fail;
240 }
241 }
242 tmp_pts = 0;
243 tmp_mul = 1;
244 tmp_stream = 0;
245 tmp_head_idx = 0;
246 for (i = 0; i < 256;) {
247 int tmp_flags = ffio_read_varlen(bc);
248 int tmp_fields = ffio_read_varlen(bc);
249 if (tmp_fields < 0) {
250 av_log(s, AV_LOG_ERROR, "fields %d is invalid\n", tmp_fields);
251 ret = AVERROR_INVALIDDATA;
252 goto fail;
253 }
254
255 if (tmp_fields > 0)
256 tmp_pts = get_s(bc);
257 if (tmp_fields > 1)
258 tmp_mul = ffio_read_varlen(bc);
259 if (tmp_fields > 2)
260 tmp_stream = ffio_read_varlen(bc);
261 if (tmp_fields > 3)
262 tmp_size = ffio_read_varlen(bc);
263 else
264 tmp_size = 0;
265 if (tmp_fields > 4)
266 tmp_res = ffio_read_varlen(bc);
267 else
268 tmp_res = 0;
269 if (tmp_fields > 5)
270 count = ffio_read_varlen(bc);
271 else
272 count = tmp_mul - (unsigned)tmp_size;
273 if (tmp_fields > 6)
274 get_s(bc);
275 if (tmp_fields > 7)
276 tmp_head_idx = ffio_read_varlen(bc);
277
278 while (tmp_fields-- > 8) {
279 if (bc->eof_reached) {
280 av_log(s, AV_LOG_ERROR, "reached EOF while decoding main header\n");
281 ret = AVERROR_INVALIDDATA;
282 goto fail;
283 }
284 ffio_read_varlen(bc);
285 }
286
287 if (count <= 0 || count > 256 - (i <= 'N') - i) {
288 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
289 ret = AVERROR_INVALIDDATA;
290 goto fail;
291 }
292 if (tmp_stream >= stream_count) {
293 av_log(s, AV_LOG_ERROR, "illegal stream number %d >= %d\n",
294 tmp_stream, stream_count);
295 ret = AVERROR_INVALIDDATA;
296 goto fail;
297 }
298 if (tmp_size < 0 || tmp_size > INT_MAX - count) {
299 av_log(s, AV_LOG_ERROR, "illegal size\n");
300 ret = AVERROR_INVALIDDATA;
301 goto fail;
302 }
303
304 for (j = 0; j < count; j++, i++) {
305 if (i == 'N') {
306 nut->frame_code[i].flags = FLAG_INVALID;
307 j--;
308 continue;
309 }
310 nut->frame_code[i].flags = tmp_flags;
311 nut->frame_code[i].pts_delta = tmp_pts;
312 nut->frame_code[i].stream_id = tmp_stream;
313 nut->frame_code[i].size_mul = tmp_mul;
314 nut->frame_code[i].size_lsb = tmp_size + j;
315 nut->frame_code[i].reserved_count = tmp_res;
316 nut->frame_code[i].header_idx = tmp_head_idx;
317 }
318 }
319 av_assert0(nut->frame_code['N'].flags == FLAG_INVALID);
320
321 if (end > avio_tell(bc) + 4) {
322 int rem = 1024;
323 GET_V(nut->header_count, tmp < 128U);
324 nut->header_count++;
325 for (i = 1; i < nut->header_count; i++) {
326 uint8_t *hdr;
327 GET_V(nut->header_len[i], tmp > 0 && tmp < 256);
328 if (rem < nut->header_len[i]) {
329 av_log(s, AV_LOG_ERROR,
330 "invalid elision header %d : %d > %d\n",
331 i, nut->header_len[i], rem);
332 ret = AVERROR_INVALIDDATA;
333 goto fail;
334 }
335 rem -= nut->header_len[i];
336 hdr = av_malloc(nut->header_len[i]);
337 if (!hdr) {
338 ret = AVERROR(ENOMEM);
339 goto fail;
340 }
341 avio_read(bc, hdr, nut->header_len[i]);
342 nut->header[i] = hdr;
343 }
344 av_assert0(nut->header_len[0] == 0);
345 }
346
347 // flags had been effectively introduced in version 4
348 if (nut->version > 3 && end > avio_tell(bc) + 4) {
349 nut->flags = ffio_read_varlen(bc);
350 }
351
352 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
353 av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n");
354 ret = AVERROR_INVALIDDATA;
355 goto fail;
356 }
357
358 nut->stream = av_calloc(stream_count, sizeof(StreamContext));
359 if (!nut->stream) {
360 ret = AVERROR(ENOMEM);
361 goto fail;
362 }
363 for (i = 0; i < stream_count; i++) {
364 if (!avformat_new_stream(s, NULL)) {
365 ret = AVERROR(ENOMEM);
366 goto fail;
367 }
368 }
369
370 return 0;
371 fail:
372 av_freep(&nut->time_base);
373 for (i = 1; i < nut->header_count; i++) {
374 av_freep(&nut->header[i]);
375 }
376 nut->header_count = 0;
377 return ret;
378 }
379
380 static int decode_stream_header(NUTContext *nut)
381 {
382 AVFormatContext *s = nut->avf;
383 AVIOContext *bc = s->pb;
384 StreamContext *stc;
385 int class, stream_id, ret;
386 uint64_t tmp, end;
387 AVStream *st = NULL;
388
389 end = get_packetheader(nut, bc, 1, STREAM_STARTCODE);
390 end += avio_tell(bc);
391
392 GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base);
393 stc = &nut->stream[stream_id];
394 st = s->streams[stream_id];
395 if (!st)
396 return AVERROR(ENOMEM);
397
398 class = ffio_read_varlen(bc);
399 tmp = get_fourcc(bc);
400 st->codecpar->codec_tag = tmp;
401 switch (class) {
402 case 0:
403 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
404 st->codecpar->codec_id = av_codec_get_id((const AVCodecTag * const []) {
405 ff_nut_video_tags,
406 ff_codec_bmp_tags,
407 ff_codec_movvideo_tags,
408 0
409 },
410 tmp);
411 break;
412 case 1:
413 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
414 st->codecpar->codec_id = av_codec_get_id((const AVCodecTag * const []) {
415 ff_nut_audio_tags,
416 ff_codec_wav_tags,
417 ff_nut_audio_extra_tags,
418 0
419 },
420 tmp);
421 break;
422 case 2:
423 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
424 st->codecpar->codec_id = ff_codec_get_id(ff_nut_subtitle_tags, tmp);
425 break;
426 case 3:
427 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
428 st->codecpar->codec_id = ff_codec_get_id(ff_nut_data_tags, tmp);
429 break;
430 default:
431 av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class);
432 return AVERROR(ENOSYS);
433 }
434 if (class < 3 && st->codecpar->codec_id == AV_CODEC_ID_NONE)
435 av_log(s, AV_LOG_ERROR,
436 "Unknown codec tag '0x%04x' for stream number %d\n",
437 (unsigned int) tmp, stream_id);
438
439 GET_V(stc->time_base_id, tmp < nut->time_base_count);
440 GET_V(stc->msb_pts_shift, tmp < 16);
441 stc->max_pts_distance = ffio_read_varlen(bc);
442 GET_V(stc->decode_delay, tmp < 1000); // sanity limit, raise this if Moore's law is true
443 st->codecpar->video_delay = stc->decode_delay;
444 ffio_read_varlen(bc); // stream flags
445
446 GET_V(st->codecpar->extradata_size, tmp < (1 << 30));
447 if (st->codecpar->extradata_size) {
448 ret = ff_get_extradata(s, st->codecpar, bc,
449 st->codecpar->extradata_size);
450 if (ret < 0)
451 return ret;
452 }
453
454 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
455 GET_V(st->codecpar->width, tmp > 0);
456 GET_V(st->codecpar->height, tmp > 0);
457 st->sample_aspect_ratio.num = ffio_read_varlen(bc);
458 st->sample_aspect_ratio.den = ffio_read_varlen(bc);
459 if ((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)) {
460 av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n",
461 st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
462 ret = AVERROR_INVALIDDATA;
463 goto fail;
464 }
465 ffio_read_varlen(bc); /* csp type */
466 } else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
467 GET_V(st->codecpar->sample_rate, tmp > 0);
468 ffio_read_varlen(bc); // samplerate_den
469 GET_V(st->codecpar->ch_layout.nb_channels, tmp > 0);
470 }
471 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
472 av_log(s, AV_LOG_ERROR,
473 "stream header %d checksum mismatch\n", stream_id);
474 ret = AVERROR_INVALIDDATA;
475 goto fail;
476 }
477 stc->time_base = &nut->time_base[stc->time_base_id];
478 avpriv_set_pts_info(s->streams[stream_id], 63, stc->time_base->num,
479 stc->time_base->den);
480 return 0;
481 fail:
482 if (st && st->codecpar) {
483 av_freep(&st->codecpar->extradata);
484 st->codecpar->extradata_size = 0;
485 }
486 return ret;
487 }
488
489 static void set_disposition_bits(AVFormatContext *avf, char *value,
490 int stream_id)
491 {
492 int flag = 0, i;
493
494 for (i = 0; ff_nut_dispositions[i].flag; ++i)
495 if (!strcmp(ff_nut_dispositions[i].str, value))
496 flag = ff_nut_dispositions[i].flag;
497 if (!flag)
498 av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value);
499 for (i = 0; i < avf->nb_streams; ++i)
500 if (stream_id == i || stream_id == -1)
501 avf->streams[i]->disposition |= flag;
502 }
503
504 static int decode_info_header(NUTContext *nut)
505 {
506 AVFormatContext *s = nut->avf;
507 AVIOContext *bc = s->pb;
508 uint64_t tmp, chapter_start, chapter_len;
509 unsigned int stream_id_plus1, count;
510 int i, ret = 0;
511 int64_t chapter_id, value, end;
512 char name[256], str_value[1024], type_str[256];
513 const char *type;
514 int *event_flags = NULL;
515 AVChapter *chapter = NULL;
516 AVStream *st = NULL;
517 AVDictionary **metadata = NULL;
518 int metadata_flag = 0;
519
520 end = get_packetheader(nut, bc, 1, INFO_STARTCODE);
521 end += avio_tell(bc);
522
523 GET_V(stream_id_plus1, tmp <= s->nb_streams);
524 chapter_id = get_s(bc);
525 chapter_start = ffio_read_varlen(bc);
526 chapter_len = ffio_read_varlen(bc);
527 count = ffio_read_varlen(bc);
528
529 if (chapter_id && !stream_id_plus1) {
530 int64_t start = chapter_start / nut->time_base_count;
531 chapter = avpriv_new_chapter(s, chapter_id,
532 nut->time_base[chapter_start %
533 nut->time_base_count],
534 start, start + chapter_len, NULL);
535 if (!chapter) {
536 av_log(s, AV_LOG_ERROR, "Could not create chapter.\n");
537 return AVERROR(ENOMEM);
538 }
539 metadata = &chapter->metadata;
540 } else if (stream_id_plus1) {
541 st = s->streams[stream_id_plus1 - 1];
542 metadata = &st->metadata;
543 event_flags = &st->event_flags;
544 metadata_flag = AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
545 } else {
546 metadata = &s->metadata;
547 event_flags = &s->event_flags;
548 metadata_flag = AVFMT_EVENT_FLAG_METADATA_UPDATED;
549 }
550
551 for (i = 0; i < count; i++) {
552 ret = get_str(bc, name, sizeof(name));
553 if (ret < 0) {
554 av_log(s, AV_LOG_ERROR, "get_str failed while decoding info header\n");
555 return ret;
556 }
557 value = get_s(bc);
558 str_value[0] = 0;
559
560 if (value == -1) {
561 type = "UTF-8";
562 ret = get_str(bc, str_value, sizeof(str_value));
563 } else if (value == -2) {
564 ret = get_str(bc, type_str, sizeof(type_str));
565 if (ret < 0) {
566 av_log(s, AV_LOG_ERROR, "get_str failed while decoding info header\n");
567 return ret;
568 }
569 type = type_str;
570 ret = get_str(bc, str_value, sizeof(str_value));
571 } else if (value == -3) {
572 type = "s";
573 value = get_s(bc);
574 } else if (value == -4) {
575 type = "t";
576 value = ffio_read_varlen(bc);
577 } else if (value < -4) {
578 type = "r";
579 get_s(bc);
580 } else {
581 type = "v";
582 }
583
584 if (ret < 0) {
585 av_log(s, AV_LOG_ERROR, "get_str failed while decoding info header\n");
586 return ret;
587 }
588
589 if (stream_id_plus1 > s->nb_streams) {
590 av_log(s, AV_LOG_WARNING,
591 "invalid stream id %d for info packet\n",
592 stream_id_plus1);
593 continue;
594 }
595
596 if (!strcmp(type, "UTF-8")) {
597 if (chapter_id == 0 && !strcmp(name, "Disposition")) {
598 set_disposition_bits(s, str_value, stream_id_plus1 - 1);
599 continue;
600 }
601
602 if (stream_id_plus1 && !strcmp(name, "r_frame_rate")) {
603 sscanf(str_value, "%d/%d", &st->r_frame_rate.num, &st->r_frame_rate.den);
604 if (st->r_frame_rate.num >= 1000LL*st->r_frame_rate.den ||
605 st->r_frame_rate.num < 0 || st->r_frame_rate.den < 0)
606 st->r_frame_rate.num = st->r_frame_rate.den = 0;
607 continue;
608 }
609
610 if (metadata && av_strcasecmp(name, "Uses") &&
611 av_strcasecmp(name, "Depends") && av_strcasecmp(name, "Replaces")) {
612 if (event_flags)
613 *event_flags |= metadata_flag;
614 av_dict_set(metadata, name, str_value, 0);
615 }
616 }
617 }
618
619 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
620 av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n");
621 return AVERROR_INVALIDDATA;
622 }
623 fail:
624 return FFMIN(ret, 0);
625 }
626
627 static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr)
628 {
629 AVFormatContext *s = nut->avf;
630 AVIOContext *bc = s->pb;
631 int64_t end;
632 uint64_t tmp;
633 int ret;
634
635 nut->last_syncpoint_pos = avio_tell(bc) - 8;
636
637 end = get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);
638 end += avio_tell(bc);
639
640 tmp = ffio_read_varlen(bc);
641 *back_ptr = nut->last_syncpoint_pos - 16 * ffio_read_varlen(bc);
642 if (*back_ptr < 0)
643 return AVERROR_INVALIDDATA;
644
645 ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count],
646 tmp / nut->time_base_count);
647
648 if (nut->flags & NUT_BROADCAST) {
649 tmp = ffio_read_varlen(bc);
650 av_log(s, AV_LOG_VERBOSE, "Syncpoint wallclock %"PRId64"\n",
651 av_rescale_q(tmp / nut->time_base_count,
652 nut->time_base[tmp % nut->time_base_count],
653 AV_TIME_BASE_Q));
654 }
655
656 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
657 av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n");
658 return AVERROR_INVALIDDATA;
659 }
660
661 *ts = tmp / nut->time_base_count *
662 av_q2d(nut->time_base[tmp % nut->time_base_count]) * AV_TIME_BASE;
663
664 if ((ret = ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts)) < 0)
665 return ret;
666
667 return 0;
668 }
669
670 //FIXME calculate exactly, this is just a good approximation.
671 static int64_t find_duration(NUTContext *nut, int64_t filesize)
672 {
673 AVFormatContext *s = nut->avf;
674 int64_t duration = 0;
675
676 ff_find_last_ts(s, -1, &duration, NULL, nut_read_timestamp);
677
678 if(duration > 0)
679 s->duration_estimation_method = AVFMT_DURATION_FROM_PTS;
680 return duration;
681 }
682
683 static int find_and_decode_index(NUTContext *nut)
684 {
685 AVFormatContext *s = nut->avf;
686 AVIOContext *bc = s->pb;
687 uint64_t tmp, end;
688 int i, j, syncpoint_count;
689 int64_t filesize = avio_size(bc);
690 int64_t *syncpoints = NULL;
691 uint64_t max_pts;
692 int8_t *has_keyframe = NULL;
693 int ret = AVERROR_INVALIDDATA;
694
695 if(filesize <= 0)
696 return -1;
697
698 avio_seek(bc, filesize - 12, SEEK_SET);
699 avio_seek(bc, filesize - avio_rb64(bc), SEEK_SET);
700 if (avio_rb64(bc) != INDEX_STARTCODE) {
701 av_log(s, AV_LOG_WARNING, "no index at the end\n");
702
703 if(s->duration<=0)
704 s->duration = find_duration(nut, filesize);
705 return ret;
706 }
707
708 end = get_packetheader(nut, bc, 1, INDEX_STARTCODE);
709 end += avio_tell(bc);
710
711 max_pts = ffio_read_varlen(bc);
712 s->duration = av_rescale_q(max_pts / nut->time_base_count,
713 nut->time_base[max_pts % nut->time_base_count],
714 AV_TIME_BASE_Q);
715 s->duration_estimation_method = AVFMT_DURATION_FROM_PTS;
716
717 GET_V(syncpoint_count, tmp < INT_MAX / 8 && tmp > 0);
718 syncpoints = av_malloc_array(syncpoint_count, sizeof(int64_t));
719 has_keyframe = av_malloc_array(syncpoint_count + 1, sizeof(int8_t));
720 if (!syncpoints || !has_keyframe) {
721 ret = AVERROR(ENOMEM);
722 goto fail;
723 }
724 for (i = 0; i < syncpoint_count; i++) {
725 syncpoints[i] = ffio_read_varlen(bc);
726 if (syncpoints[i] <= 0)
727 goto fail;
728 if (i)
729 syncpoints[i] += syncpoints[i - 1];
730 }
731
732 for (i = 0; i < s->nb_streams; i++) {
733 int64_t last_pts = -1;
734 for (j = 0; j < syncpoint_count;) {
735 uint64_t x = ffio_read_varlen(bc);
736 int type = x & 1;
737 int n = j;
738 x >>= 1;
739 if (type) {
740 int flag = x & 1;
741 x >>= 1;
742 if (n + x >= syncpoint_count + 1) {
743 av_log(s, AV_LOG_ERROR, "index overflow A %d + %"PRIu64" >= %d\n", n, x, syncpoint_count + 1);
744 goto fail;
745 }
746 while (x--)
747 has_keyframe[n++] = flag;
748 has_keyframe[n++] = !flag;
749 } else {
750 if (x <= 1) {
751 av_log(s, AV_LOG_ERROR, "index: x %"PRIu64" is invalid\n", x);
752 goto fail;
753 }
754 while (x != 1) {
755 if (n >= syncpoint_count + 1) {
756 av_log(s, AV_LOG_ERROR, "index overflow B\n");
757 goto fail;
758 }
759 has_keyframe[n++] = x & 1;
760 x >>= 1;
761 }
762 }
763 if (has_keyframe[0]) {
764 av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n");
765 goto fail;
766 }
767 av_assert0(n <= syncpoint_count + 1);
768 for (; j < n && j < syncpoint_count; j++) {
769 if (has_keyframe[j]) {
770 uint64_t B, A = ffio_read_varlen(bc);
771 if (!A) {
772 A = ffio_read_varlen(bc);
773 B = ffio_read_varlen(bc);
774 // eor_pts[j][i] = last_pts + A + B
775 } else
776 B = 0;
777 av_add_index_entry(s->streams[i], 16 * syncpoints[j - 1],
778 last_pts + A, 0, 0, AVINDEX_KEYFRAME);
779 last_pts += A + B;
780 }
781 }
782 }
783 }
784
785 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
786 av_log(s, AV_LOG_ERROR, "index checksum mismatch\n");
787 goto fail;
788 }
789 ret = 0;
790
791 fail:
792 av_free(syncpoints);
793 av_free(has_keyframe);
794 return ret;
795 }
796
797 static int nut_read_close(AVFormatContext *s)
798 {
799 NUTContext *nut = s->priv_data;
800 int i;
801
802 av_freep(&nut->time_base);
803 av_freep(&nut->stream);
804 ff_nut_free_sp(nut);
805 for (i = 1; i < nut->header_count; i++)
806 av_freep(&nut->header[i]);
807
808 return 0;
809 }
810
811 static int nut_read_header(AVFormatContext *s)
812 {
813 NUTContext *nut = s->priv_data;
814 AVIOContext *bc = s->pb;
815 int64_t pos;
816 int initialized_stream_count, ret;
817
818 nut->avf = s;
819
820 /* main header */
821 pos = 0;
822 ret = 0;
823 do {
824 if (ret == AVERROR(ENOMEM))
825 return ret;
826
827 pos = find_startcode(bc, MAIN_STARTCODE, pos) + 1;
828 if (pos < 0 + 1) {
829 av_log(s, AV_LOG_ERROR, "No main startcode found.\n");
830 return AVERROR_INVALIDDATA;
831 }
832 } while ((ret = decode_main_header(nut)) < 0);
833
834 /* stream headers */
835 pos = 0;
836 for (initialized_stream_count = 0; initialized_stream_count < s->nb_streams;) {
837 pos = find_startcode(bc, STREAM_STARTCODE, pos) + 1;
838 if (pos < 0 + 1) {
839 av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n");
840 return AVERROR_INVALIDDATA;
841 }
842 if (decode_stream_header(nut) >= 0)
843 initialized_stream_count++;
844 }
845
846 /* info headers */
847 pos = 0;
848 for (;;) {
849 uint64_t startcode = find_any_startcode(bc, pos);
850 pos = avio_tell(bc);
851
852 if (startcode == 0) {
853 av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
854 return AVERROR_INVALIDDATA;
855 } else if (startcode == SYNCPOINT_STARTCODE) {
856 nut->next_startcode = startcode;
857 break;
858 } else if (startcode != INFO_STARTCODE) {
859 continue;
860 }
861
862 decode_info_header(nut);
863 }
864
865 ffformatcontext(s)->data_offset = pos - 8;
866
867 if (bc->seekable & AVIO_SEEKABLE_NORMAL) {
868 int64_t orig_pos = avio_tell(bc);
869 find_and_decode_index(nut);
870 avio_seek(bc, orig_pos, SEEK_SET);
871 }
872 av_assert0(nut->next_startcode == SYNCPOINT_STARTCODE);
873
874 ff_metadata_conv_ctx(s, NULL, ff_nut_metadata_conv);
875
876 return 0;
877 }
878
879 static int read_sm_data(AVFormatContext *s, AVIOContext *bc, AVPacket *pkt, int is_meta, int64_t maxpos)
880 {
881 int count = ffio_read_varlen(bc);
882 int skip_start = 0;
883 int skip_end = 0;
884 int sample_rate = 0;
885 int width = 0;
886 int height = 0;
887 int i, ret;
888
889 for (i=0; i<count; i++) {
890 uint8_t name[256], str_value[256], type_str[256];
891 int value;
892 if (avio_tell(bc) >= maxpos)
893 return AVERROR_INVALIDDATA;
894 ret = get_str(bc, name, sizeof(name));
895 if (ret < 0) {
896 av_log(s, AV_LOG_ERROR, "get_str failed while reading sm data\n");
897 return ret;
898 }
899 value = get_s(bc);
900
901 if (value == -1) {
902 ret = get_str(bc, str_value, sizeof(str_value));
903 if (ret < 0) {
904 av_log(s, AV_LOG_ERROR, "get_str failed while reading sm data\n");
905 return ret;
906 }
907 av_log(s, AV_LOG_WARNING, "Unknown string %s / %s\n", name, str_value);
908 } else if (value == -2) {
909 uint8_t *dst = NULL;
910 int64_t v64, value_len;
911
912 ret = get_str(bc, type_str, sizeof(type_str));
913 if (ret < 0) {
914 av_log(s, AV_LOG_ERROR, "get_str failed while reading sm data\n");
915 return ret;
916 }
917 value_len = ffio_read_varlen(bc);
918 if (value_len < 0 || value_len >= maxpos - avio_tell(bc))
919 return AVERROR_INVALIDDATA;
920 if (!strcmp(name, "Palette")) {
921 dst = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, value_len);
922 } else if (!strcmp(name, "Extradata")) {
923 dst = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, value_len);
924 } else if (sscanf(name, "CodecSpecificSide%"SCNd64"", &v64) == 1) {
925 dst = av_packet_new_side_data(pkt, AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL, value_len + 8);
926 if(!dst)
927 return AVERROR(ENOMEM);
928 AV_WB64(dst, v64);
929 dst += 8;
930 } else if (!strcmp(name, "ChannelLayout") && value_len == 8) {
931 // Ignored
932 continue;
933 } else {
934 av_log(s, AV_LOG_WARNING, "Unknown data %s / %s\n", name, type_str);
935 avio_skip(bc, value_len);
936 continue;
937 }
938 if(!dst)
939 return AVERROR(ENOMEM);
940 avio_read(bc, dst, value_len);
941 } else if (value == -3) {
942 value = get_s(bc);
943 } else if (value == -4) {
944 value = ffio_read_varlen(bc);
945 } else if (value < -4) {
946 get_s(bc);
947 } else {
948 if (!strcmp(name, "SkipStart")) {
949 skip_start = value;
950 } else if (!strcmp(name, "SkipEnd")) {
951 skip_end = value;
952 } else if (!strcmp(name, "Channels")) {
953 // Ignored
954 } else if (!strcmp(name, "SampleRate")) {
955 sample_rate = value;
956 } else if (!strcmp(name, "Width")) {
957 width = value;
958 } else if (!strcmp(name, "Height")) {
959 height = value;
960 } else {
961 av_log(s, AV_LOG_WARNING, "Unknown integer %s\n", name);
962 }
963 }
964 }
965
966 if (sample_rate || width || height) {
967 uint8_t *dst = av_packet_new_side_data(pkt, AV_PKT_DATA_PARAM_CHANGE, 16);
968 if (!dst)
969 return AVERROR(ENOMEM);
970 bytestream_put_le32(&dst,
971 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE*(!!sample_rate) +
972 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS*(!!(width|height))
973 );
974 if (sample_rate)
975 bytestream_put_le32(&dst, sample_rate);
976 if (width || height){
977 bytestream_put_le32(&dst, width);
978 bytestream_put_le32(&dst, height);
979 }
980 }
981
982 if (skip_start || skip_end) {
983 uint8_t *dst = av_packet_new_side_data(pkt, AV_PKT_DATA_SKIP_SAMPLES, 10);
984 if (!dst)
985 return AVERROR(ENOMEM);
986 AV_WL32(dst, skip_start);
987 AV_WL32(dst+4, skip_end);
988 }
989
990 if (avio_tell(bc) >= maxpos)
991 return AVERROR_INVALIDDATA;
992
993 return 0;
994 }
995
996 static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id,
997 uint8_t *header_idx, int frame_code)
998 {
999 AVFormatContext *s = nut->avf;
1000 AVIOContext *bc = s->pb;
1001 StreamContext *stc;
1002 int size, flags, size_mul, pts_delta, i, reserved_count, ret;
1003 uint64_t tmp;
1004
1005 if (!(nut->flags & NUT_PIPE) &&
1006 avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance) {
1007 av_log(s, AV_LOG_ERROR,
1008 "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n",
1009 avio_tell(bc), nut->last_syncpoint_pos, nut->max_distance);
1010 return AVERROR_INVALIDDATA;
1011 }
1012
1013 flags = nut->frame_code[frame_code].flags;
1014 size_mul = nut->frame_code[frame_code].size_mul;
1015 size = nut->frame_code[frame_code].size_lsb;
1016 *stream_id = nut->frame_code[frame_code].stream_id;
1017 pts_delta = nut->frame_code[frame_code].pts_delta;
1018 reserved_count = nut->frame_code[frame_code].reserved_count;
1019 *header_idx = nut->frame_code[frame_code].header_idx;
1020
1021 if (flags & FLAG_INVALID)
1022 return AVERROR_INVALIDDATA;
1023 if (flags & FLAG_CODED)
1024 flags ^= ffio_read_varlen(bc);
1025 if (flags & FLAG_STREAM_ID) {
1026 GET_V(*stream_id, tmp < s->nb_streams);
1027 }
1028 stc = &nut->stream[*stream_id];
1029 if (flags & FLAG_CODED_PTS) {
1030 int64_t coded_pts = ffio_read_varlen(bc);
1031 // FIXME check last_pts validity?
1032 if (coded_pts < (1LL << stc->msb_pts_shift)) {
1033 *pts = ff_lsb2full(stc, coded_pts);
1034 } else
1035 *pts = coded_pts - (1LL << stc->msb_pts_shift);
1036 } else
1037 *pts = stc->last_pts + pts_delta;
1038 if (flags & FLAG_SIZE_MSB)
1039 size += size_mul * ffio_read_varlen(bc);
1040 if (flags & FLAG_MATCH_TIME)
1041 get_s(bc);
1042 if (flags & FLAG_HEADER_IDX)
1043 *header_idx = ffio_read_varlen(bc);
1044 if (flags & FLAG_RESERVED)
1045 reserved_count = ffio_read_varlen(bc);
1046 for (i = 0; i < reserved_count; i++) {
1047 if (bc->eof_reached) {
1048 av_log(s, AV_LOG_ERROR, "reached EOF while decoding frame header\n");
1049 return AVERROR_INVALIDDATA;
1050 }
1051 ffio_read_varlen(bc);
1052 }
1053
1054 if (*header_idx >= (unsigned)nut->header_count) {
1055 av_log(s, AV_LOG_ERROR, "header_idx invalid\n");
1056 return AVERROR_INVALIDDATA;
1057 }
1058 if (size > 4096)
1059 *header_idx = 0;
1060 size -= nut->header_len[*header_idx];
1061
1062 if (flags & FLAG_CHECKSUM) {
1063 avio_rb32(bc); // FIXME check this
1064 } else if (!(nut->flags & NUT_PIPE) &&
1065 size > 2 * nut->max_distance ||
1066 FFABS(stc->last_pts - *pts) > stc->max_pts_distance) {
1067 av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n");
1068 return AVERROR_INVALIDDATA;
1069 }
1070
1071 stc->last_pts = *pts;
1072 stc->last_flags = flags;
1073
1074 return size;
1075 fail:
1076 return ret;
1077 }
1078
1079 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code)
1080 {
1081 AVFormatContext *s = nut->avf;
1082 AVIOContext *bc = s->pb;
1083 int size, stream_id, discard, ret;
1084 int64_t pts, last_IP_pts;
1085 StreamContext *stc;
1086 uint8_t header_idx;
1087
1088 size = decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code);
1089 if (size < 0)
1090 return size;
1091
1092 stc = &nut->stream[stream_id];
1093
1094 if (stc->last_flags & FLAG_KEY)
1095 stc->skip_until_key_frame = 0;
1096
1097 discard = s->streams[stream_id]->discard;
1098 last_IP_pts = ffstream(s->streams[stream_id])->last_IP_pts;
1099 if ((discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY)) ||
1100 (discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE &&
1101 last_IP_pts > pts) ||
1102 discard >= AVDISCARD_ALL ||
1103 stc->skip_until_key_frame) {
1104 avio_skip(bc, size);
1105 return 1;
1106 }
1107
1108 ret = av_new_packet(pkt, size + nut->header_len[header_idx]);
1109 if (ret < 0)
1110 return ret;
1111 if (nut->header[header_idx])
1112 memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]);
1113 pkt->pos = avio_tell(bc); // FIXME
1114 if (stc->last_flags & FLAG_SM_DATA) {
1115 int sm_size;
1116 if (read_sm_data(s, bc, pkt, 0, pkt->pos + size) < 0) {
1117 ret = AVERROR_INVALIDDATA;
1118 goto fail;
1119 }
1120 if (read_sm_data(s, bc, pkt, 1, pkt->pos + size) < 0) {
1121 ret = AVERROR_INVALIDDATA;
1122 goto fail;
1123 }
1124 sm_size = avio_tell(bc) - pkt->pos;
1125 size -= sm_size;
1126 }
1127
1128 ret = avio_read(bc, pkt->data + nut->header_len[header_idx], size);
1129 if (ret != size) {
1130 if (ret < 0)
1131 goto fail;
1132 }
1133 av_shrink_packet(pkt, nut->header_len[header_idx] + ret);
1134
1135 pkt->stream_index = stream_id;
1136 if (stc->last_flags & FLAG_KEY)
1137 pkt->flags |= AV_PKT_FLAG_KEY;
1138 pkt->pts = pts;
1139
1140 return 0;
1141 fail:
1142 av_packet_unref(pkt);
1143 return ret;
1144 }
1145
1146 static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
1147 {
1148 NUTContext *nut = s->priv_data;
1149 AVIOContext *bc = s->pb;
1150 int i, frame_code = 0, ret, skip;
1151 int64_t ts, back_ptr;
1152
1153 for (;;) {
1154 int64_t pos = avio_tell(bc);
1155 uint64_t tmp = nut->next_startcode;
1156 nut->next_startcode = 0;
1157
1158 if (tmp) {
1159 pos -= 8;
1160 } else {
1161 frame_code = avio_r8(bc);
1162 if (avio_feof(bc))
1163 return AVERROR_EOF;
1164 if (frame_code == 'N') {
1165 tmp = frame_code;
1166 for (i = 1; i < 8; i++)
1167 tmp = (tmp << 8) + avio_r8(bc);
1168 }
1169 }
1170 switch (tmp) {
1171 case MAIN_STARTCODE:
1172 case STREAM_STARTCODE:
1173 case INDEX_STARTCODE:
1174 skip = get_packetheader(nut, bc, 0, tmp);
1175 avio_skip(bc, skip);
1176 break;
1177 case INFO_STARTCODE:
1178 if (decode_info_header(nut) < 0)
1179 goto resync;
1180 break;
1181 case SYNCPOINT_STARTCODE:
1182 if (decode_syncpoint(nut, &ts, &back_ptr) < 0)
1183 goto resync;
1184 frame_code = avio_r8(bc);
1185 case 0:
1186 ret = decode_frame(nut, pkt, frame_code);
1187 if (ret == 0)
1188 return 0;
1189 else if (ret == 1) // OK but discard packet
1190 break;
1191 default:
1192 resync:
1193 av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos);
1194 tmp = find_any_startcode(bc, FFMAX(nut->last_syncpoint_pos, nut->last_resync_pos) + 1);
1195 nut->last_resync_pos = avio_tell(bc);
1196 if (tmp == 0)
1197 return AVERROR_INVALIDDATA;
1198 av_log(s, AV_LOG_DEBUG, "sync\n");
1199 nut->next_startcode = tmp;
1200 }
1201 }
1202 }
1203
1204 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,
1205 int64_t *pos_arg, int64_t pos_limit)
1206 {
1207 NUTContext *nut = s->priv_data;
1208 AVIOContext *bc = s->pb;
1209 int64_t pos, pts, back_ptr;
1210 av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n",
1211 stream_index, *pos_arg, pos_limit);
1212
1213 pos = *pos_arg;
1214 do {
1215 pos = find_startcode(bc, SYNCPOINT_STARTCODE, pos) + 1;
1216 if (pos < 1) {
1217 av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n");
1218 return AV_NOPTS_VALUE;
1219 }
1220 } while (decode_syncpoint(nut, &pts, &back_ptr) < 0);
1221 *pos_arg = pos - 1;
1222 av_assert0(nut->last_syncpoint_pos == *pos_arg);
1223
1224 av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts, back_ptr);
1225 if (stream_index == -2)
1226 return back_ptr;
1227 av_assert0(stream_index == -1);
1228 return pts;
1229 }
1230
1231 static int read_seek(AVFormatContext *s, int stream_index,
1232 int64_t pts, int flags)
1233 {
1234 NUTContext *nut = s->priv_data;
1235 AVStream *st = s->streams[stream_index];
1236 FFStream *const sti = ffstream(st);
1237 Syncpoint dummy = { .ts = pts * av_q2d(st->time_base) * AV_TIME_BASE };
1238 Syncpoint nopts_sp = { .ts = AV_NOPTS_VALUE, .back_ptr = AV_NOPTS_VALUE };
1239 Syncpoint *sp, *next_node[2] = { &nopts_sp, &nopts_sp };
1240 int64_t pos, pos2, ts;
1241 int i;
1242
1243 if (nut->flags & NUT_PIPE) {
1244 return AVERROR(ENOSYS);
1245 }
1246
1247 if (sti->index_entries) {
1248 int index = av_index_search_timestamp(st, pts, flags);
1249 if (index < 0)
1250 index = av_index_search_timestamp(st, pts, flags ^ AVSEEK_FLAG_BACKWARD);
1251 if (index < 0)
1252 return -1;
1253
1254 pos2 = sti->index_entries[index].pos;
1255 ts = sti->index_entries[index].timestamp;
1256 } else {
1257 av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pts_cmp,
1258 (void **) next_node);
1259 av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n",
1260 next_node[0]->pos, next_node[1]->pos, next_node[0]->ts,
1261 next_node[1]->ts);
1262 pos = ff_gen_search(s, -1, dummy.ts, next_node[0]->pos,
1263 next_node[1]->pos, next_node[1]->pos,
1264 next_node[0]->ts, next_node[1]->ts,
1265 AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp);
1266 if (pos < 0)
1267 return pos;
1268
1269 if (!(flags & AVSEEK_FLAG_BACKWARD)) {
1270 dummy.pos = pos + 16;
1271 next_node[1] = &nopts_sp;
1272 av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pos_cmp,
1273 (void **) next_node);
1274 pos2 = ff_gen_search(s, -2, dummy.pos, next_node[0]->pos,
1275 next_node[1]->pos, next_node[1]->pos,
1276 next_node[0]->back_ptr, next_node[1]->back_ptr,
1277 flags, &ts, nut_read_timestamp);
1278 if (pos2 >= 0)
1279 pos = pos2;
1280 // FIXME dir but I think it does not matter
1281 }
1282 dummy.pos = pos;
1283 sp = av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pos_cmp,
1284 NULL);
1285
1286 av_assert0(sp);
1287 pos2 = sp->back_ptr - 15;
1288 }
1289 av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2);
1290 pos = find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2);
1291 avio_seek(s->pb, pos, SEEK_SET);
1292 nut->last_syncpoint_pos = pos;
1293 av_log(s, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos);
1294 if (pos2 > pos || pos2 + 15 < pos)
1295 av_log(s, AV_LOG_ERROR, "no syncpoint at backptr pos\n");
1296 for (i = 0; i < s->nb_streams; i++)
1297 nut->stream[i].skip_until_key_frame = 1;
1298
1299 nut->last_resync_pos = 0;
1300
1301 return 0;
1302 }
1303
1304 const FFInputFormat ff_nut_demuxer = {
1305 .p.name = "nut",
1306 .p.long_name = NULL_IF_CONFIG_SMALL("NUT"),
1307 .p.flags = AVFMT_SEEK_TO_PTS,
1308 .p.extensions = "nut",
1309 .p.codec_tag = ff_nut_codec_tags,
1310 .priv_data_size = sizeof(NUTContext),
1311 .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
1312 .read_probe = nut_probe,
1313 .read_header = nut_read_header,
1314 .read_packet = nut_read_packet,
1315 .read_close = nut_read_close,
1316 .read_seek = read_seek,
1317 };
FFmpeg git repo