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path: root/libavformat/nutdec.c (plain)
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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
38static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,
39 int64_t *pos_arg, int64_t pos_limit);
40
41static 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
65static 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
75static 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
89static int get_packetheader(NUTContext *nut, AVIOContext *bc,
90 int calculate_checksum, uint64_t startcode)
91{
92 int64_t size;
93
94 startcode = av_be2ne64(startcode);
95 startcode = ff_crc04C11DB7_update(0, (uint8_t*) &startcode, 8);
96
97 ffio_init_checksum(bc, ff_crc04C11DB7_update, startcode);
98 size = ffio_read_varlen(bc);
99 if (size > 4096)
100 avio_rb32(bc);
101 if (ffio_get_checksum(bc) && size > 4096)
102 return -1;
103
104 ffio_init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0);
105
106 return size;
107}
108
109static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos)
110{
111 uint64_t state = 0;
112
113 if (pos >= 0)
114 /* Note, this may fail if the stream is not seekable, but that should
115 * not matter, as in this case we simply start where we currently are */
116 avio_seek(bc, pos, SEEK_SET);
117 while (!avio_feof(bc)) {
118 state = (state << 8) | avio_r8(bc);
119 if ((state >> 56) != 'N')
120 continue;
121 switch (state) {
122 case MAIN_STARTCODE:
123 case STREAM_STARTCODE:
124 case SYNCPOINT_STARTCODE:
125 case INFO_STARTCODE:
126 case INDEX_STARTCODE:
127 return state;
128 }
129 }
130
131 return 0;
132}
133
134/**
135 * Find the given startcode.
136 * @param code the startcode
137 * @param pos the start position of the search, or -1 if the current position
138 * @return the position of the startcode or -1 if not found
139 */
140static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos)
141{
142 for (;;) {
143 uint64_t startcode = find_any_startcode(bc, pos);
144 if (startcode == code)
145 return avio_tell(bc) - 8;
146 else if (startcode == 0)
147 return -1;
148 pos = -1;
149 }
150}
151
152static int nut_probe(AVProbeData *p)
153{
154 int i;
155
156 for (i = 0; i < p->buf_size-8; i++) {
157 if (AV_RB32(p->buf+i) != MAIN_STARTCODE>>32)
158 continue;
159 if (AV_RB32(p->buf+i+4) == (MAIN_STARTCODE & 0xFFFFFFFF))
160 return AVPROBE_SCORE_MAX;
161 }
162 return 0;
163}
164
165#define GET_V(dst, check) \
166 do { \
167 tmp = ffio_read_varlen(bc); \
168 if (!(check)) { \
169 av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp); \
170 ret = AVERROR_INVALIDDATA; \
171 goto fail; \
172 } \
173 dst = tmp; \
174 } while (0)
175
176static int skip_reserved(AVIOContext *bc, int64_t pos)
177{
178 pos -= avio_tell(bc);
179 if (pos < 0) {
180 avio_seek(bc, pos, SEEK_CUR);
181 return AVERROR_INVALIDDATA;
182 } else {
183 while (pos--) {
184 if (bc->eof_reached)
185 return AVERROR_INVALIDDATA;
186 avio_r8(bc);
187 }
188 return 0;
189 }
190}
191
192static int decode_main_header(NUTContext *nut)
193{
194 AVFormatContext *s = nut->avf;
195 AVIOContext *bc = s->pb;
196 uint64_t tmp, end;
197 unsigned int stream_count;
198 int i, j, count, ret;
199 int tmp_stream, tmp_mul, tmp_pts, tmp_size, tmp_res, tmp_head_idx;
200
201 end = get_packetheader(nut, bc, 1, MAIN_STARTCODE);
202 end += avio_tell(bc);
203
204 nut->version = ffio_read_varlen(bc);
205 if (nut->version < NUT_MIN_VERSION &&
206 nut->version > NUT_MAX_VERSION) {
207 av_log(s, AV_LOG_ERROR, "Version %d not supported.\n",
208 nut->version);
209 return AVERROR(ENOSYS);
210 }
211 if (nut->version > 3)
212 nut->minor_version = ffio_read_varlen(bc);
213
214 GET_V(stream_count, tmp > 0 && tmp <= NUT_MAX_STREAMS);
215
216 nut->max_distance = ffio_read_varlen(bc);
217 if (nut->max_distance > 65536) {
218 av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance);
219 nut->max_distance = 65536;
220 }
221
222 GET_V(nut->time_base_count, tmp > 0 && tmp < INT_MAX / sizeof(AVRational));
223 nut->time_base = av_malloc_array(nut->time_base_count, sizeof(AVRational));
224 if (!nut->time_base)
225 return AVERROR(ENOMEM);
226
227 for (i = 0; i < nut->time_base_count; i++) {
228 GET_V(nut->time_base[i].num, tmp > 0 && tmp < (1ULL << 31));
229 GET_V(nut->time_base[i].den, tmp > 0 && tmp < (1ULL << 31));
230 if (av_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1) {
231 av_log(s, AV_LOG_ERROR, "invalid time base %d/%d\n",
232 nut->time_base[i].num,
233 nut->time_base[i].den);
234 ret = AVERROR_INVALIDDATA;
235 goto fail;
236 }
237 }
238 tmp_pts = 0;
239 tmp_mul = 1;
240 tmp_stream = 0;
241 tmp_head_idx = 0;
242 for (i = 0; i < 256;) {
243 int tmp_flags = ffio_read_varlen(bc);
244 int tmp_fields = ffio_read_varlen(bc);
245
246 if (tmp_fields > 0)
247 tmp_pts = get_s(bc);
248 if (tmp_fields > 1)
249 tmp_mul = ffio_read_varlen(bc);
250 if (tmp_fields > 2)
251 tmp_stream = ffio_read_varlen(bc);
252 if (tmp_fields > 3)
253 tmp_size = ffio_read_varlen(bc);
254 else
255 tmp_size = 0;
256 if (tmp_fields > 4)
257 tmp_res = ffio_read_varlen(bc);
258 else
259 tmp_res = 0;
260 if (tmp_fields > 5)
261 count = ffio_read_varlen(bc);
262 else
263 count = tmp_mul - tmp_size;
264 if (tmp_fields > 6)
265 get_s(bc);
266 if (tmp_fields > 7)
267 tmp_head_idx = ffio_read_varlen(bc);
268
269 while (tmp_fields-- > 8) {
270 if (bc->eof_reached) {
271 av_log(s, AV_LOG_ERROR, "reached EOF while decoding main header\n");
272 ret = AVERROR_INVALIDDATA;
273 goto fail;
274 }
275 ffio_read_varlen(bc);
276 }
277
278 if (count <= 0 || count > 256 - (i <= 'N') - i) {
279 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
280 ret = AVERROR_INVALIDDATA;
281 goto fail;
282 }
283 if (tmp_stream >= stream_count) {
284 av_log(s, AV_LOG_ERROR, "illegal stream number %d >= %d\n",
285 tmp_stream, stream_count);
286 ret = AVERROR_INVALIDDATA;
287 goto fail;
288 }
289
290 for (j = 0; j < count; j++, i++) {
291 if (i == 'N') {
292 nut->frame_code[i].flags = FLAG_INVALID;
293 j--;
294 continue;
295 }
296 nut->frame_code[i].flags = tmp_flags;
297 nut->frame_code[i].pts_delta = tmp_pts;
298 nut->frame_code[i].stream_id = tmp_stream;
299 nut->frame_code[i].size_mul = tmp_mul;
300 nut->frame_code[i].size_lsb = tmp_size + j;
301 nut->frame_code[i].reserved_count = tmp_res;
302 nut->frame_code[i].header_idx = tmp_head_idx;
303 }
304 }
305 av_assert0(nut->frame_code['N'].flags == FLAG_INVALID);
306
307 if (end > avio_tell(bc) + 4) {
308 int rem = 1024;
309 GET_V(nut->header_count, tmp < 128U);
310 nut->header_count++;
311 for (i = 1; i < nut->header_count; i++) {
312 uint8_t *hdr;
313 GET_V(nut->header_len[i], tmp > 0 && tmp < 256);
314 if (rem < nut->header_len[i]) {
315 av_log(s, AV_LOG_ERROR,
316 "invalid elision header %d : %d > %d\n",
317 i, nut->header_len[i], rem);
318 ret = AVERROR_INVALIDDATA;
319 goto fail;
320 }
321 rem -= nut->header_len[i];
322 hdr = av_malloc(nut->header_len[i]);
323 if (!hdr) {
324 ret = AVERROR(ENOMEM);
325 goto fail;
326 }
327 avio_read(bc, hdr, nut->header_len[i]);
328 nut->header[i] = hdr;
329 }
330 av_assert0(nut->header_len[0] == 0);
331 }
332
333 // flags had been effectively introduced in version 4
334 if (nut->version > 3 && end > avio_tell(bc) + 4) {
335 nut->flags = ffio_read_varlen(bc);
336 }
337
338 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
339 av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n");
340 ret = AVERROR_INVALIDDATA;
341 goto fail;
342 }
343
344 nut->stream = av_calloc(stream_count, sizeof(StreamContext));
345 if (!nut->stream) {
346 ret = AVERROR(ENOMEM);
347 goto fail;
348 }
349 for (i = 0; i < stream_count; i++)
350 avformat_new_stream(s, NULL);
351
352 return 0;
353fail:
354 av_freep(&nut->time_base);
355 for (i = 1; i < nut->header_count; i++) {
356 av_freep(&nut->header[i]);
357 }
358 nut->header_count = 0;
359 return ret;
360}
361
362static int decode_stream_header(NUTContext *nut)
363{
364 AVFormatContext *s = nut->avf;
365 AVIOContext *bc = s->pb;
366 StreamContext *stc;
367 int class, stream_id, ret;
368 uint64_t tmp, end;
369 AVStream *st = NULL;
370
371 end = get_packetheader(nut, bc, 1, STREAM_STARTCODE);
372 end += avio_tell(bc);
373
374 GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base);
375 stc = &nut->stream[stream_id];
376 st = s->streams[stream_id];
377 if (!st)
378 return AVERROR(ENOMEM);
379
380 class = ffio_read_varlen(bc);
381 tmp = get_fourcc(bc);
382 st->codecpar->codec_tag = tmp;
383 switch (class) {
384 case 0:
385 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
386 st->codecpar->codec_id = av_codec_get_id((const AVCodecTag * const []) {
387 ff_nut_video_tags,
388 ff_codec_bmp_tags,
389 ff_codec_movvideo_tags,
390 0
391 },
392 tmp);
393 break;
394 case 1:
395 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
396 st->codecpar->codec_id = av_codec_get_id((const AVCodecTag * const []) {
397 ff_nut_audio_tags,
398 ff_codec_wav_tags,
399 ff_nut_audio_extra_tags,
400 0
401 },
402 tmp);
403 break;
404 case 2:
405 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
406 st->codecpar->codec_id = ff_codec_get_id(ff_nut_subtitle_tags, tmp);
407 break;
408 case 3:
409 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
410 st->codecpar->codec_id = ff_codec_get_id(ff_nut_data_tags, tmp);
411 break;
412 default:
413 av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class);
414 return AVERROR(ENOSYS);
415 }
416 if (class < 3 && st->codecpar->codec_id == AV_CODEC_ID_NONE)
417 av_log(s, AV_LOG_ERROR,
418 "Unknown codec tag '0x%04x' for stream number %d\n",
419 (unsigned int) tmp, stream_id);
420
421 GET_V(stc->time_base_id, tmp < nut->time_base_count);
422 GET_V(stc->msb_pts_shift, tmp < 16);
423 stc->max_pts_distance = ffio_read_varlen(bc);
424 GET_V(stc->decode_delay, tmp < 1000); // sanity limit, raise this if Moore's law is true
425 st->codecpar->video_delay = stc->decode_delay;
426 ffio_read_varlen(bc); // stream flags
427
428 GET_V(st->codecpar->extradata_size, tmp < (1 << 30));
429 if (st->codecpar->extradata_size) {
430 if (ff_get_extradata(s, st->codecpar, bc, st->codecpar->extradata_size) < 0)
431 return AVERROR(ENOMEM);
432 }
433
434 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
435 GET_V(st->codecpar->width, tmp > 0);
436 GET_V(st->codecpar->height, tmp > 0);
437 st->sample_aspect_ratio.num = ffio_read_varlen(bc);
438 st->sample_aspect_ratio.den = ffio_read_varlen(bc);
439 if ((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)) {
440 av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n",
441 st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
442 ret = AVERROR_INVALIDDATA;
443 goto fail;
444 }
445 ffio_read_varlen(bc); /* csp type */
446 } else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
447 GET_V(st->codecpar->sample_rate, tmp > 0);
448 ffio_read_varlen(bc); // samplerate_den
449 GET_V(st->codecpar->channels, tmp > 0);
450 }
451 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
452 av_log(s, AV_LOG_ERROR,
453 "stream header %d checksum mismatch\n", stream_id);
454 ret = AVERROR_INVALIDDATA;
455 goto fail;
456 }
457 stc->time_base = &nut->time_base[stc->time_base_id];
458 avpriv_set_pts_info(s->streams[stream_id], 63, stc->time_base->num,
459 stc->time_base->den);
460 return 0;
461fail:
462 if (st && st->codecpar) {
463 av_freep(&st->codecpar->extradata);
464 st->codecpar->extradata_size = 0;
465 }
466 return ret;
467}
468
469static void set_disposition_bits(AVFormatContext *avf, char *value,
470 int stream_id)
471{
472 int flag = 0, i;
473
474 for (i = 0; ff_nut_dispositions[i].flag; ++i)
475 if (!strcmp(ff_nut_dispositions[i].str, value))
476 flag = ff_nut_dispositions[i].flag;
477 if (!flag)
478 av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value);
479 for (i = 0; i < avf->nb_streams; ++i)
480 if (stream_id == i || stream_id == -1)
481 avf->streams[i]->disposition |= flag;
482}
483
484static int decode_info_header(NUTContext *nut)
485{
486 AVFormatContext *s = nut->avf;
487 AVIOContext *bc = s->pb;
488 uint64_t tmp, chapter_start, chapter_len;
489 unsigned int stream_id_plus1, count;
490 int chapter_id, i, ret = 0;
491 int64_t value, end;
492 char name[256], str_value[1024], type_str[256];
493 const char *type;
494 int *event_flags = NULL;
495 AVChapter *chapter = NULL;
496 AVStream *st = NULL;
497 AVDictionary **metadata = NULL;
498 int metadata_flag = 0;
499
500 end = get_packetheader(nut, bc, 1, INFO_STARTCODE);
501 end += avio_tell(bc);
502
503 GET_V(stream_id_plus1, tmp <= s->nb_streams);
504 chapter_id = get_s(bc);
505 chapter_start = ffio_read_varlen(bc);
506 chapter_len = ffio_read_varlen(bc);
507 count = ffio_read_varlen(bc);
508
509 if (chapter_id && !stream_id_plus1) {
510 int64_t start = chapter_start / nut->time_base_count;
511 chapter = avpriv_new_chapter(s, chapter_id,
512 nut->time_base[chapter_start %
513 nut->time_base_count],
514 start, start + chapter_len, NULL);
515 if (!chapter) {
516 av_log(s, AV_LOG_ERROR, "Could not create chapter.\n");
517 return AVERROR(ENOMEM);
518 }
519 metadata = &chapter->metadata;
520 } else if (stream_id_plus1) {
521 st = s->streams[stream_id_plus1 - 1];
522 metadata = &st->metadata;
523 event_flags = &st->event_flags;
524 metadata_flag = AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
525 } else {
526 metadata = &s->metadata;
527 event_flags = &s->event_flags;
528 metadata_flag = AVFMT_EVENT_FLAG_METADATA_UPDATED;
529 }
530
531 for (i = 0; i < count; i++) {
532 ret = get_str(bc, name, sizeof(name));
533 if (ret < 0) {
534 av_log(s, AV_LOG_ERROR, "get_str failed while decoding info header\n");
535 return ret;
536 }
537 value = get_s(bc);
538 str_value[0] = 0;
539
540 if (value == -1) {
541 type = "UTF-8";
542 ret = get_str(bc, str_value, sizeof(str_value));
543 } else if (value == -2) {
544 ret = get_str(bc, type_str, sizeof(type_str));
545 if (ret < 0) {
546 av_log(s, AV_LOG_ERROR, "get_str failed while decoding info header\n");
547 return ret;
548 }
549 type = type_str;
550 ret = get_str(bc, str_value, sizeof(str_value));
551 } else if (value == -3) {
552 type = "s";
553 value = get_s(bc);
554 } else if (value == -4) {
555 type = "t";
556 value = ffio_read_varlen(bc);
557 } else if (value < -4) {
558 type = "r";
559 get_s(bc);
560 } else {
561 type = "v";
562 }
563
564 if (ret < 0) {
565 av_log(s, AV_LOG_ERROR, "get_str failed while decoding info header\n");
566 return ret;
567 }
568
569 if (stream_id_plus1 > s->nb_streams) {
570 av_log(s, AV_LOG_WARNING,
571 "invalid stream id %d for info packet\n",
572 stream_id_plus1);
573 continue;
574 }
575
576 if (!strcmp(type, "UTF-8")) {
577 if (chapter_id == 0 && !strcmp(name, "Disposition")) {
578 set_disposition_bits(s, str_value, stream_id_plus1 - 1);
579 continue;
580 }
581
582 if (stream_id_plus1 && !strcmp(name, "r_frame_rate")) {
583 sscanf(str_value, "%d/%d", &st->r_frame_rate.num, &st->r_frame_rate.den);
584 if (st->r_frame_rate.num >= 1000LL*st->r_frame_rate.den ||
585 st->r_frame_rate.num < 0 || st->r_frame_rate.num < 0)
586 st->r_frame_rate.num = st->r_frame_rate.den = 0;
587 continue;
588 }
589
590 if (metadata && av_strcasecmp(name, "Uses") &&
591 av_strcasecmp(name, "Depends") && av_strcasecmp(name, "Replaces")) {
592 if (event_flags)
593 *event_flags |= metadata_flag;
594 av_dict_set(metadata, name, str_value, 0);
595 }
596 }
597 }
598
599 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
600 av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n");
601 return AVERROR_INVALIDDATA;
602 }
603fail:
604 return FFMIN(ret, 0);
605}
606
607static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr)
608{
609 AVFormatContext *s = nut->avf;
610 AVIOContext *bc = s->pb;
611 int64_t end;
612 uint64_t tmp;
613 int ret;
614
615 nut->last_syncpoint_pos = avio_tell(bc) - 8;
616
617 end = get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);
618 end += avio_tell(bc);
619
620 tmp = ffio_read_varlen(bc);
621 *back_ptr = nut->last_syncpoint_pos - 16 * ffio_read_varlen(bc);
622 if (*back_ptr < 0)
623 return AVERROR_INVALIDDATA;
624
625 ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count],
626 tmp / nut->time_base_count);
627
628 if (nut->flags & NUT_BROADCAST) {
629 tmp = ffio_read_varlen(bc);
630 av_log(s, AV_LOG_VERBOSE, "Syncpoint wallclock %"PRId64"\n",
631 av_rescale_q(tmp / nut->time_base_count,
632 nut->time_base[tmp % nut->time_base_count],
633 AV_TIME_BASE_Q));
634 }
635
636 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
637 av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n");
638 return AVERROR_INVALIDDATA;
639 }
640
641 *ts = tmp / nut->time_base_count *
642 av_q2d(nut->time_base[tmp % nut->time_base_count]) * AV_TIME_BASE;
643
644 if ((ret = ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts)) < 0)
645 return ret;
646
647 return 0;
648}
649
650//FIXME calculate exactly, this is just a good approximation.
651static int64_t find_duration(NUTContext *nut, int64_t filesize)
652{
653 AVFormatContext *s = nut->avf;
654 int64_t duration = 0;
655
656 ff_find_last_ts(s, -1, &duration, NULL, nut_read_timestamp);
657
658 if(duration > 0)
659 s->duration_estimation_method = AVFMT_DURATION_FROM_PTS;
660 return duration;
661}
662
663static int find_and_decode_index(NUTContext *nut)
664{
665 AVFormatContext *s = nut->avf;
666 AVIOContext *bc = s->pb;
667 uint64_t tmp, end;
668 int i, j, syncpoint_count;
669 int64_t filesize = avio_size(bc);
670 int64_t *syncpoints = NULL;
671 uint64_t max_pts;
672 int8_t *has_keyframe = NULL;
673 int ret = AVERROR_INVALIDDATA;
674
675 if(filesize <= 0)
676 return -1;
677
678 avio_seek(bc, filesize - 12, SEEK_SET);
679 avio_seek(bc, filesize - avio_rb64(bc), SEEK_SET);
680 if (avio_rb64(bc) != INDEX_STARTCODE) {
681 av_log(s, AV_LOG_WARNING, "no index at the end\n");
682
683 if(s->duration<=0)
684 s->duration = find_duration(nut, filesize);
685 return ret;
686 }
687
688 end = get_packetheader(nut, bc, 1, INDEX_STARTCODE);
689 end += avio_tell(bc);
690
691 max_pts = ffio_read_varlen(bc);
692 s->duration = av_rescale_q(max_pts / nut->time_base_count,
693 nut->time_base[max_pts % nut->time_base_count],
694 AV_TIME_BASE_Q);
695 s->duration_estimation_method = AVFMT_DURATION_FROM_PTS;
696
697 GET_V(syncpoint_count, tmp < INT_MAX / 8 && tmp > 0);
698 syncpoints = av_malloc_array(syncpoint_count, sizeof(int64_t));
699 has_keyframe = av_malloc_array(syncpoint_count + 1, sizeof(int8_t));
700 if (!syncpoints || !has_keyframe) {
701 ret = AVERROR(ENOMEM);
702 goto fail;
703 }
704 for (i = 0; i < syncpoint_count; i++) {
705 syncpoints[i] = ffio_read_varlen(bc);
706 if (syncpoints[i] <= 0)
707 goto fail;
708 if (i)
709 syncpoints[i] += syncpoints[i - 1];
710 }
711
712 for (i = 0; i < s->nb_streams; i++) {
713 int64_t last_pts = -1;
714 for (j = 0; j < syncpoint_count;) {
715 uint64_t x = ffio_read_varlen(bc);
716 int type = x & 1;
717 int n = j;
718 x >>= 1;
719 if (type) {
720 int flag = x & 1;
721 x >>= 1;
722 if (n + x >= syncpoint_count + 1) {
723 av_log(s, AV_LOG_ERROR, "index overflow A %d + %"PRIu64" >= %d\n", n, x, syncpoint_count + 1);
724 goto fail;
725 }
726 while (x--)
727 has_keyframe[n++] = flag;
728 has_keyframe[n++] = !flag;
729 } else {
730 if (x <= 1) {
731 av_log(s, AV_LOG_ERROR, "index: x %"PRIu64" is invalid\n", x);
732 goto fail;
733 }
734 while (x != 1) {
735 if (n >= syncpoint_count + 1) {
736 av_log(s, AV_LOG_ERROR, "index overflow B\n");
737 goto fail;
738 }
739 has_keyframe[n++] = x & 1;
740 x >>= 1;
741 }
742 }
743 if (has_keyframe[0]) {
744 av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n");
745 goto fail;
746 }
747 av_assert0(n <= syncpoint_count + 1);
748 for (; j < n && j < syncpoint_count; j++) {
749 if (has_keyframe[j]) {
750 uint64_t B, A = ffio_read_varlen(bc);
751 if (!A) {
752 A = ffio_read_varlen(bc);
753 B = ffio_read_varlen(bc);
754 // eor_pts[j][i] = last_pts + A + B
755 } else
756 B = 0;
757 av_add_index_entry(s->streams[i], 16 * syncpoints[j - 1],
758 last_pts + A, 0, 0, AVINDEX_KEYFRAME);
759 last_pts += A + B;
760 }
761 }
762 }
763 }
764
765 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
766 av_log(s, AV_LOG_ERROR, "index checksum mismatch\n");
767 goto fail;
768 }
769 ret = 0;
770
771fail:
772 av_free(syncpoints);
773 av_free(has_keyframe);
774 return ret;
775}
776
777static int nut_read_close(AVFormatContext *s)
778{
779 NUTContext *nut = s->priv_data;
780 int i;
781
782 av_freep(&nut->time_base);
783 av_freep(&nut->stream);
784 ff_nut_free_sp(nut);
785 for (i = 1; i < nut->header_count; i++)
786 av_freep(&nut->header[i]);
787
788 return 0;
789}
790
791static int nut_read_header(AVFormatContext *s)
792{
793 NUTContext *nut = s->priv_data;
794 AVIOContext *bc = s->pb;
795 int64_t pos;
796 int initialized_stream_count;
797
798 nut->avf = s;
799
800 /* main header */
801 pos = 0;
802 do {
803 pos = find_startcode(bc, MAIN_STARTCODE, pos) + 1;
804 if (pos < 0 + 1) {
805 av_log(s, AV_LOG_ERROR, "No main startcode found.\n");
806 goto fail;
807 }
808 } while (decode_main_header(nut) < 0);
809
810 /* stream headers */
811 pos = 0;
812 for (initialized_stream_count = 0; initialized_stream_count < s->nb_streams;) {
813 pos = find_startcode(bc, STREAM_STARTCODE, pos) + 1;
814 if (pos < 0 + 1) {
815 av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n");
816 goto fail;
817 }
818 if (decode_stream_header(nut) >= 0)
819 initialized_stream_count++;
820 }
821
822 /* info headers */
823 pos = 0;
824 for (;;) {
825 uint64_t startcode = find_any_startcode(bc, pos);
826 pos = avio_tell(bc);
827
828 if (startcode == 0) {
829 av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
830 goto fail;
831 } else if (startcode == SYNCPOINT_STARTCODE) {
832 nut->next_startcode = startcode;
833 break;
834 } else if (startcode != INFO_STARTCODE) {
835 continue;
836 }
837
838 decode_info_header(nut);
839 }
840
841 s->internal->data_offset = pos - 8;
842
843 if (bc->seekable & AVIO_SEEKABLE_NORMAL) {
844 int64_t orig_pos = avio_tell(bc);
845 find_and_decode_index(nut);
846 avio_seek(bc, orig_pos, SEEK_SET);
847 }
848 av_assert0(nut->next_startcode == SYNCPOINT_STARTCODE);
849
850 ff_metadata_conv_ctx(s, NULL, ff_nut_metadata_conv);
851
852 return 0;
853
854fail:
855 nut_read_close(s);
856
857 return AVERROR_INVALIDDATA;
858}
859
860static int read_sm_data(AVFormatContext *s, AVIOContext *bc, AVPacket *pkt, int is_meta, int64_t maxpos)
861{
862 int count = ffio_read_varlen(bc);
863 int skip_start = 0;
864 int skip_end = 0;
865 int channels = 0;
866 int64_t channel_layout = 0;
867 int sample_rate = 0;
868 int width = 0;
869 int height = 0;
870 int i, ret;
871
872 for (i=0; i<count; i++) {
873 uint8_t name[256], str_value[256], type_str[256];
874 int value;
875 if (avio_tell(bc) >= maxpos)
876 return AVERROR_INVALIDDATA;
877 ret = get_str(bc, name, sizeof(name));
878 if (ret < 0) {
879 av_log(s, AV_LOG_ERROR, "get_str failed while reading sm data\n");
880 return ret;
881 }
882 value = get_s(bc);
883
884 if (value == -1) {
885 ret = get_str(bc, str_value, sizeof(str_value));
886 if (ret < 0) {
887 av_log(s, AV_LOG_ERROR, "get_str failed while reading sm data\n");
888 return ret;
889 }
890 av_log(s, AV_LOG_WARNING, "Unknown string %s / %s\n", name, str_value);
891 } else if (value == -2) {
892 uint8_t *dst = NULL;
893 int64_t v64, value_len;
894
895 ret = get_str(bc, type_str, sizeof(type_str));
896 if (ret < 0) {
897 av_log(s, AV_LOG_ERROR, "get_str failed while reading sm data\n");
898 return ret;
899 }
900 value_len = ffio_read_varlen(bc);
901 if (value_len < 0 || value_len >= maxpos - avio_tell(bc))
902 return AVERROR_INVALIDDATA;
903 if (!strcmp(name, "Palette")) {
904 dst = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, value_len);
905 } else if (!strcmp(name, "Extradata")) {
906 dst = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, value_len);
907 } else if (sscanf(name, "CodecSpecificSide%"SCNd64"", &v64) == 1) {
908 dst = av_packet_new_side_data(pkt, AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL, value_len + 8);
909 if(!dst)
910 return AVERROR(ENOMEM);
911 AV_WB64(dst, v64);
912 dst += 8;
913 } else if (!strcmp(name, "ChannelLayout") && value_len == 8) {
914 channel_layout = avio_rl64(bc);
915 continue;
916 } else {
917 av_log(s, AV_LOG_WARNING, "Unknown data %s / %s\n", name, type_str);
918 avio_skip(bc, value_len);
919 continue;
920 }
921 if(!dst)
922 return AVERROR(ENOMEM);
923 avio_read(bc, dst, value_len);
924 } else if (value == -3) {
925 value = get_s(bc);
926 } else if (value == -4) {
927 value = ffio_read_varlen(bc);
928 } else if (value < -4) {
929 get_s(bc);
930 } else {
931 if (!strcmp(name, "SkipStart")) {
932 skip_start = value;
933 } else if (!strcmp(name, "SkipEnd")) {
934 skip_end = value;
935 } else if (!strcmp(name, "Channels")) {
936 channels = value;
937 } else if (!strcmp(name, "SampleRate")) {
938 sample_rate = value;
939 } else if (!strcmp(name, "Width")) {
940 width = value;
941 } else if (!strcmp(name, "Height")) {
942 height = value;
943 } else {
944 av_log(s, AV_LOG_WARNING, "Unknown integer %s\n", name);
945 }
946 }
947 }
948
949 if (channels || channel_layout || sample_rate || width || height) {
950 uint8_t *dst = av_packet_new_side_data(pkt, AV_PKT_DATA_PARAM_CHANGE, 28);
951 if (!dst)
952 return AVERROR(ENOMEM);
953 bytestream_put_le32(&dst,
954 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT*(!!channels) +
955 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT*(!!channel_layout) +
956 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE*(!!sample_rate) +
957 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS*(!!(width|height))
958 );
959 if (channels)
960 bytestream_put_le32(&dst, channels);
961 if (channel_layout)
962 bytestream_put_le64(&dst, channel_layout);
963 if (sample_rate)
964 bytestream_put_le32(&dst, sample_rate);
965 if (width || height){
966 bytestream_put_le32(&dst, width);
967 bytestream_put_le32(&dst, height);
968 }
969 }
970
971 if (skip_start || skip_end) {
972 uint8_t *dst = av_packet_new_side_data(pkt, AV_PKT_DATA_SKIP_SAMPLES, 10);
973 if (!dst)
974 return AVERROR(ENOMEM);
975 AV_WL32(dst, skip_start);
976 AV_WL32(dst+4, skip_end);
977 }
978
979 if (avio_tell(bc) >= maxpos)
980 return AVERROR_INVALIDDATA;
981
982 return 0;
983}
984
985static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id,
986 uint8_t *header_idx, int frame_code)
987{
988 AVFormatContext *s = nut->avf;
989 AVIOContext *bc = s->pb;
990 StreamContext *stc;
991 int size, flags, size_mul, pts_delta, i, reserved_count, ret;
992 uint64_t tmp;
993
994 if (!(nut->flags & NUT_PIPE) &&
995 avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance) {
996 av_log(s, AV_LOG_ERROR,
997 "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n",
998 avio_tell(bc), nut->last_syncpoint_pos, nut->max_distance);
999 return AVERROR_INVALIDDATA;
1000 }
1001
1002 flags = nut->frame_code[frame_code].flags;
1003 size_mul = nut->frame_code[frame_code].size_mul;
1004 size = nut->frame_code[frame_code].size_lsb;
1005 *stream_id = nut->frame_code[frame_code].stream_id;
1006 pts_delta = nut->frame_code[frame_code].pts_delta;
1007 reserved_count = nut->frame_code[frame_code].reserved_count;
1008 *header_idx = nut->frame_code[frame_code].header_idx;
1009
1010 if (flags & FLAG_INVALID)
1011 return AVERROR_INVALIDDATA;
1012 if (flags & FLAG_CODED)
1013 flags ^= ffio_read_varlen(bc);
1014 if (flags & FLAG_STREAM_ID) {
1015 GET_V(*stream_id, tmp < s->nb_streams);
1016 }
1017 stc = &nut->stream[*stream_id];
1018 if (flags & FLAG_CODED_PTS) {
1019 int coded_pts = ffio_read_varlen(bc);
1020 // FIXME check last_pts validity?
1021 if (coded_pts < (1 << stc->msb_pts_shift)) {
1022 *pts = ff_lsb2full(stc, coded_pts);
1023 } else
1024 *pts = coded_pts - (1LL << stc->msb_pts_shift);
1025 } else
1026 *pts = stc->last_pts + pts_delta;
1027 if (flags & FLAG_SIZE_MSB)
1028 size += size_mul * ffio_read_varlen(bc);
1029 if (flags & FLAG_MATCH_TIME)
1030 get_s(bc);
1031 if (flags & FLAG_HEADER_IDX)
1032 *header_idx = ffio_read_varlen(bc);
1033 if (flags & FLAG_RESERVED)
1034 reserved_count = ffio_read_varlen(bc);
1035 for (i = 0; i < reserved_count; i++) {
1036 if (bc->eof_reached) {
1037 av_log(s, AV_LOG_ERROR, "reached EOF while decoding frame header\n");
1038 return AVERROR_INVALIDDATA;
1039 }
1040 ffio_read_varlen(bc);
1041 }
1042
1043 if (*header_idx >= (unsigned)nut->header_count) {
1044 av_log(s, AV_LOG_ERROR, "header_idx invalid\n");
1045 return AVERROR_INVALIDDATA;
1046 }
1047 if (size > 4096)
1048 *header_idx = 0;
1049 size -= nut->header_len[*header_idx];
1050
1051 if (flags & FLAG_CHECKSUM) {
1052 avio_rb32(bc); // FIXME check this
1053 } else if (!(nut->flags & NUT_PIPE) &&
1054 size > 2 * nut->max_distance ||
1055 FFABS(stc->last_pts - *pts) > stc->max_pts_distance) {
1056 av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n");
1057 return AVERROR_INVALIDDATA;
1058 }
1059
1060 stc->last_pts = *pts;
1061 stc->last_flags = flags;
1062
1063 return size;
1064fail:
1065 return ret;
1066}
1067
1068static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code)
1069{
1070 AVFormatContext *s = nut->avf;
1071 AVIOContext *bc = s->pb;
1072 int size, stream_id, discard, ret;
1073 int64_t pts, last_IP_pts;
1074 StreamContext *stc;
1075 uint8_t header_idx;
1076
1077 size = decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code);
1078 if (size < 0)
1079 return size;
1080
1081 stc = &nut->stream[stream_id];
1082
1083 if (stc->last_flags & FLAG_KEY)
1084 stc->skip_until_key_frame = 0;
1085
1086 discard = s->streams[stream_id]->discard;
1087 last_IP_pts = s->streams[stream_id]->last_IP_pts;
1088 if ((discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY)) ||
1089 (discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE &&
1090 last_IP_pts > pts) ||
1091 discard >= AVDISCARD_ALL ||
1092 stc->skip_until_key_frame) {
1093 avio_skip(bc, size);
1094 return 1;
1095 }
1096
1097 ret = av_new_packet(pkt, size + nut->header_len[header_idx]);
1098 if (ret < 0)
1099 return ret;
1100 if (nut->header[header_idx])
1101 memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]);
1102 pkt->pos = avio_tell(bc); // FIXME
1103 if (stc->last_flags & FLAG_SM_DATA) {
1104 int sm_size;
1105 if (read_sm_data(s, bc, pkt, 0, pkt->pos + size) < 0) {
1106 ret = AVERROR_INVALIDDATA;
1107 goto fail;
1108 }
1109 if (read_sm_data(s, bc, pkt, 1, pkt->pos + size) < 0) {
1110 ret = AVERROR_INVALIDDATA;
1111 goto fail;
1112 }
1113 sm_size = avio_tell(bc) - pkt->pos;
1114 size -= sm_size;
1115 pkt->size -= sm_size;
1116 }
1117
1118 ret = avio_read(bc, pkt->data + nut->header_len[header_idx], size);
1119 if (ret != size) {
1120 if (ret < 0)
1121 goto fail;
1122 }
1123 av_shrink_packet(pkt, nut->header_len[header_idx] + ret);
1124
1125 pkt->stream_index = stream_id;
1126 if (stc->last_flags & FLAG_KEY)
1127 pkt->flags |= AV_PKT_FLAG_KEY;
1128 pkt->pts = pts;
1129
1130 return 0;
1131fail:
1132 av_packet_unref(pkt);
1133 return ret;
1134}
1135
1136static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
1137{
1138 NUTContext *nut = s->priv_data;
1139 AVIOContext *bc = s->pb;
1140 int i, frame_code = 0, ret, skip;
1141 int64_t ts, back_ptr;
1142
1143 for (;;) {
1144 int64_t pos = avio_tell(bc);
1145 uint64_t tmp = nut->next_startcode;
1146 nut->next_startcode = 0;
1147
1148 if (tmp) {
1149 pos -= 8;
1150 } else {
1151 frame_code = avio_r8(bc);
1152 if (avio_feof(bc))
1153 return AVERROR_EOF;
1154 if (frame_code == 'N') {
1155 tmp = frame_code;
1156 for (i = 1; i < 8; i++)
1157 tmp = (tmp << 8) + avio_r8(bc);
1158 }
1159 }
1160 switch (tmp) {
1161 case MAIN_STARTCODE:
1162 case STREAM_STARTCODE:
1163 case INDEX_STARTCODE:
1164 skip = get_packetheader(nut, bc, 0, tmp);
1165 avio_skip(bc, skip);
1166 break;
1167 case INFO_STARTCODE:
1168 if (decode_info_header(nut) < 0)
1169 goto resync;
1170 break;
1171 case SYNCPOINT_STARTCODE:
1172 if (decode_syncpoint(nut, &ts, &back_ptr) < 0)
1173 goto resync;
1174 frame_code = avio_r8(bc);
1175 case 0:
1176 ret = decode_frame(nut, pkt, frame_code);
1177 if (ret == 0)
1178 return 0;
1179 else if (ret == 1) // OK but discard packet
1180 break;
1181 default:
1182resync:
1183 av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos);
1184 tmp = find_any_startcode(bc, FFMAX(nut->last_syncpoint_pos, nut->last_resync_pos) + 1);
1185 nut->last_resync_pos = avio_tell(bc);
1186 if (tmp == 0)
1187 return AVERROR_INVALIDDATA;
1188 av_log(s, AV_LOG_DEBUG, "sync\n");
1189 nut->next_startcode = tmp;
1190 }
1191 }
1192}
1193
1194static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,
1195 int64_t *pos_arg, int64_t pos_limit)
1196{
1197 NUTContext *nut = s->priv_data;
1198 AVIOContext *bc = s->pb;
1199 int64_t pos, pts, back_ptr;
1200 av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n",
1201 stream_index, *pos_arg, pos_limit);
1202
1203 pos = *pos_arg;
1204 do {
1205 pos = find_startcode(bc, SYNCPOINT_STARTCODE, pos) + 1;
1206 if (pos < 1) {
1207 av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n");
1208 return AV_NOPTS_VALUE;
1209 }
1210 } while (decode_syncpoint(nut, &pts, &back_ptr) < 0);
1211 *pos_arg = pos - 1;
1212 av_assert0(nut->last_syncpoint_pos == *pos_arg);
1213
1214 av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts, back_ptr);
1215 if (stream_index == -2)
1216 return back_ptr;
1217 av_assert0(stream_index == -1);
1218 return pts;
1219}
1220
1221static int read_seek(AVFormatContext *s, int stream_index,
1222 int64_t pts, int flags)
1223{
1224 NUTContext *nut = s->priv_data;
1225 AVStream *st = s->streams[stream_index];
1226 Syncpoint dummy = { .ts = pts * av_q2d(st->time_base) * AV_TIME_BASE };
1227 Syncpoint nopts_sp = { .ts = AV_NOPTS_VALUE, .back_ptr = AV_NOPTS_VALUE };
1228 Syncpoint *sp, *next_node[2] = { &nopts_sp, &nopts_sp };
1229 int64_t pos, pos2, ts;
1230 int i;
1231
1232 if (nut->flags & NUT_PIPE) {
1233 return AVERROR(ENOSYS);
1234 }
1235
1236 if (st->index_entries) {
1237 int index = av_index_search_timestamp(st, pts, flags);
1238 if (index < 0)
1239 index = av_index_search_timestamp(st, pts, flags ^ AVSEEK_FLAG_BACKWARD);
1240 if (index < 0)
1241 return -1;
1242
1243 pos2 = st->index_entries[index].pos;
1244 ts = st->index_entries[index].timestamp;
1245 } else {
1246 av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pts_cmp,
1247 (void **) next_node);
1248 av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n",
1249 next_node[0]->pos, next_node[1]->pos, next_node[0]->ts,
1250 next_node[1]->ts);
1251 pos = ff_gen_search(s, -1, dummy.ts, next_node[0]->pos,
1252 next_node[1]->pos, next_node[1]->pos,
1253 next_node[0]->ts, next_node[1]->ts,
1254 AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp);
1255 if (pos < 0)
1256 return pos;
1257
1258 if (!(flags & AVSEEK_FLAG_BACKWARD)) {
1259 dummy.pos = pos + 16;
1260 next_node[1] = &nopts_sp;
1261 av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pos_cmp,
1262 (void **) next_node);
1263 pos2 = ff_gen_search(s, -2, dummy.pos, next_node[0]->pos,
1264 next_node[1]->pos, next_node[1]->pos,
1265 next_node[0]->back_ptr, next_node[1]->back_ptr,
1266 flags, &ts, nut_read_timestamp);
1267 if (pos2 >= 0)
1268 pos = pos2;
1269 // FIXME dir but I think it does not matter
1270 }
1271 dummy.pos = pos;
1272 sp = av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pos_cmp,
1273 NULL);
1274
1275 av_assert0(sp);
1276 pos2 = sp->back_ptr - 15;
1277 }
1278 av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2);
1279 pos = find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2);
1280 avio_seek(s->pb, pos, SEEK_SET);
1281 nut->last_syncpoint_pos = pos;
1282 av_log(NULL, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos);
1283 if (pos2 > pos || pos2 + 15 < pos)
1284 av_log(NULL, AV_LOG_ERROR, "no syncpoint at backptr pos\n");
1285 for (i = 0; i < s->nb_streams; i++)
1286 nut->stream[i].skip_until_key_frame = 1;
1287
1288 nut->last_resync_pos = 0;
1289
1290 return 0;
1291}
1292
1293AVInputFormat ff_nut_demuxer = {
1294 .name = "nut",
1295 .long_name = NULL_IF_CONFIG_SMALL("NUT"),
1296 .flags = AVFMT_SEEK_TO_PTS,
1297 .priv_data_size = sizeof(NUTContext),
1298 .read_probe = nut_probe,
1299 .read_header = nut_read_header,
1300 .read_packet = nut_read_packet,
1301 .read_close = nut_read_close,
1302 .read_seek = read_seek,
1303 .extensions = "nut",
1304 .codec_tag = ff_nut_codec_tags,
1305};
1306
generated by cgit at 2024-05-17 05:46:25 (GMT)