2 * "NUT" Container Format demuxer
3 * Copyright (c) 2004-2006 Michael Niedermayer
4 * Copyright (c) 2003 Alex Beregszaszi
6 * This file is part of FFmpeg.
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.
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.
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
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"
36 #define NUT_MAX_STREAMS 256 /* arbitrary sanity check value */
38 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,
39 int64_t *pos_arg, int64_t pos_limit);
41 static int get_str(AVIOContext *bc, char *string, unsigned int maxlen)
43 unsigned int len = ffio_read_varlen(bc);
46 avio_read(bc, string, FFMIN(len, maxlen));
47 while (len > maxlen) {
55 string[FFMIN(len, maxlen - 1)] = 0;
65 static int64_t get_s(AVIOContext *bc)
67 int64_t v = ffio_read_varlen(bc) + 1;
75 static uint64_t get_fourcc(AVIOContext *bc)
77 unsigned int len = ffio_read_varlen(bc);
84 av_log(NULL, AV_LOG_ERROR, "Unsupported fourcc length %d\n", len);
90 static inline uint64_t get_v_trace(AVIOContext *bc, const char *file,
91 const char *func, int line)
93 uint64_t v = ffio_read_varlen(bc);
95 av_log(NULL, AV_LOG_DEBUG, "get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n",
96 v, v, file, func, line);
100 static inline int64_t get_s_trace(AVIOContext *bc, const char *file,
101 const char *func, int line)
103 int64_t v = get_s(bc);
105 av_log(NULL, AV_LOG_DEBUG, "get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n",
106 v, v, file, func, line);
110 static inline uint64_t get_4cc_trace(AVIOContext *bc, char *file,
111 char *func, int line)
113 uint64_t v = get_fourcc(bc);
115 av_log(NULL, AV_LOG_DEBUG, "get_fourcc %5"PRId64" / %"PRIX64" in %s %s:%d\n",
116 v, v, file, func, line);
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__)
124 static int get_packetheader(NUTContext *nut, AVIOContext *bc,
125 int calculate_checksum, uint64_t startcode)
128 // start = avio_tell(bc) - 8;
130 startcode = av_be2ne64(startcode);
131 startcode = ff_crc04C11DB7_update(0, (uint8_t*) &startcode, 8);
133 ffio_init_checksum(bc, ff_crc04C11DB7_update, startcode);
134 size = ffio_read_varlen(bc);
137 if (ffio_get_checksum(bc) && size > 4096)
140 ffio_init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0);
145 static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos)
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')
159 case STREAM_STARTCODE:
160 case SYNCPOINT_STARTCODE:
162 case INDEX_STARTCODE:
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
176 static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos)
179 uint64_t startcode = find_any_startcode(bc, pos);
180 if (startcode == code)
181 return avio_tell(bc) - 8;
182 else if (startcode == 0)
188 static int nut_probe(AVProbeData *p)
192 for (i = 0; i < p->buf_size-8; i++) {
193 if (AV_RB32(p->buf+i) != MAIN_STARTCODE>>32)
195 if (AV_RB32(p->buf+i+4) == (MAIN_STARTCODE & 0xFFFFFFFF))
196 return AVPROBE_SCORE_MAX;
201 #define GET_V(dst, check) \
203 tmp = ffio_read_varlen(bc); \
205 av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp); \
206 ret = AVERROR_INVALIDDATA; \
212 static int skip_reserved(AVIOContext *bc, int64_t pos)
214 pos -= avio_tell(bc);
216 avio_seek(bc, pos, SEEK_CUR);
217 return AVERROR_INVALIDDATA;
221 return AVERROR_INVALIDDATA;
228 static int decode_main_header(NUTContext *nut)
230 AVFormatContext *s = nut->avf;
231 AVIOContext *bc = s->pb;
233 unsigned int stream_count;
234 int i, j, count, ret;
235 int tmp_stream, tmp_mul, tmp_pts, tmp_size, tmp_res, tmp_head_idx;
237 end = get_packetheader(nut, bc, 1, MAIN_STARTCODE);
238 end += avio_tell(bc);
240 nut->version = ffio_read_varlen(bc);
241 if (nut->version < NUT_MIN_VERSION &&
242 nut->version > NUT_MAX_VERSION) {
243 av_log(s, AV_LOG_ERROR, "Version %d not supported.\n",
245 return AVERROR(ENOSYS);
247 if (nut->version > 3)
248 nut->minor_version = ffio_read_varlen(bc);
250 GET_V(stream_count, tmp > 0 && tmp <= NUT_MAX_STREAMS);
252 nut->max_distance = ffio_read_varlen(bc);
253 if (nut->max_distance > 65536) {
254 av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance);
255 nut->max_distance = 65536;
258 GET_V(nut->time_base_count, tmp > 0 && tmp < INT_MAX / sizeof(AVRational));
259 nut->time_base = av_malloc_array(nut->time_base_count, sizeof(AVRational));
261 return AVERROR(ENOMEM);
263 for (i = 0; i < nut->time_base_count; i++) {
264 GET_V(nut->time_base[i].num, tmp > 0 && tmp < (1ULL << 31));
265 GET_V(nut->time_base[i].den, tmp > 0 && tmp < (1ULL << 31));
266 if (av_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1) {
267 av_log(s, AV_LOG_ERROR, "invalid time base %d/%d\n",
268 nut->time_base[i].num,
269 nut->time_base[i].den);
270 ret = AVERROR_INVALIDDATA;
278 for (i = 0; i < 256;) {
279 int tmp_flags = ffio_read_varlen(bc);
280 int tmp_fields = ffio_read_varlen(bc);
285 tmp_mul = ffio_read_varlen(bc);
287 tmp_stream = ffio_read_varlen(bc);
289 tmp_size = ffio_read_varlen(bc);
293 tmp_res = ffio_read_varlen(bc);
297 count = ffio_read_varlen(bc);
299 count = tmp_mul - tmp_size;
303 tmp_head_idx = ffio_read_varlen(bc);
305 while (tmp_fields-- > 8) {
306 if (bc->eof_reached) {
307 av_log(s, AV_LOG_ERROR, "reached EOF while decoding main header\n");
308 ret = AVERROR_INVALIDDATA;
311 ffio_read_varlen(bc);
314 if (count <= 0 || count > 256 - (i <= 'N') - i) {
315 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
316 ret = AVERROR_INVALIDDATA;
319 if (tmp_stream >= stream_count) {
320 av_log(s, AV_LOG_ERROR, "illegal stream number %d >= %d\n",
321 tmp_stream, stream_count);
322 ret = AVERROR_INVALIDDATA;
326 for (j = 0; j < count; j++, i++) {
328 nut->frame_code[i].flags = FLAG_INVALID;
332 nut->frame_code[i].flags = tmp_flags;
333 nut->frame_code[i].pts_delta = tmp_pts;
334 nut->frame_code[i].stream_id = tmp_stream;
335 nut->frame_code[i].size_mul = tmp_mul;
336 nut->frame_code[i].size_lsb = tmp_size + j;
337 nut->frame_code[i].reserved_count = tmp_res;
338 nut->frame_code[i].header_idx = tmp_head_idx;
341 av_assert0(nut->frame_code['N'].flags == FLAG_INVALID);
343 if (end > avio_tell(bc) + 4) {
345 GET_V(nut->header_count, tmp < 128U);
347 for (i = 1; i < nut->header_count; i++) {
349 GET_V(nut->header_len[i], tmp > 0 && tmp < 256);
350 if (rem < nut->header_len[i]) {
351 av_log(s, AV_LOG_ERROR,
352 "invalid elision header %d : %d > %d\n",
353 i, nut->header_len[i], rem);
354 ret = AVERROR_INVALIDDATA;
357 rem -= nut->header_len[i];
358 hdr = av_malloc(nut->header_len[i]);
360 ret = AVERROR(ENOMEM);
363 avio_read(bc, hdr, nut->header_len[i]);
364 nut->header[i] = hdr;
366 av_assert0(nut->header_len[0] == 0);
369 // flags had been effectively introduced in version 4
370 if (nut->version > 3 && end > avio_tell(bc) + 4) {
371 nut->flags = ffio_read_varlen(bc);
374 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
375 av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n");
376 ret = AVERROR_INVALIDDATA;
380 nut->stream = av_calloc(stream_count, sizeof(StreamContext));
382 ret = AVERROR(ENOMEM);
385 for (i = 0; i < stream_count; i++)
386 avformat_new_stream(s, NULL);
390 av_freep(&nut->time_base);
391 for (i = 1; i < nut->header_count; i++) {
392 av_freep(&nut->header[i]);
394 nut->header_count = 0;
398 static int decode_stream_header(NUTContext *nut)
400 AVFormatContext *s = nut->avf;
401 AVIOContext *bc = s->pb;
403 int class, stream_id, ret;
407 end = get_packetheader(nut, bc, 1, STREAM_STARTCODE);
408 end += avio_tell(bc);
410 GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base);
411 stc = &nut->stream[stream_id];
412 st = s->streams[stream_id];
414 return AVERROR(ENOMEM);
416 class = ffio_read_varlen(bc);
417 tmp = get_fourcc(bc);
418 st->codec->codec_tag = tmp;
421 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
422 st->codec->codec_id = av_codec_get_id((const AVCodecTag * const []) {
425 ff_codec_movvideo_tags,
431 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
432 st->codec->codec_id = av_codec_get_id((const AVCodecTag * const []) {
435 ff_nut_audio_extra_tags,
441 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
442 st->codec->codec_id = ff_codec_get_id(ff_nut_subtitle_tags, tmp);
445 st->codec->codec_type = AVMEDIA_TYPE_DATA;
446 st->codec->codec_id = ff_codec_get_id(ff_nut_data_tags, tmp);
449 av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class);
450 return AVERROR(ENOSYS);
452 if (class < 3 && st->codec->codec_id == AV_CODEC_ID_NONE)
453 av_log(s, AV_LOG_ERROR,
454 "Unknown codec tag '0x%04x' for stream number %d\n",
455 (unsigned int) tmp, stream_id);
457 GET_V(stc->time_base_id, tmp < nut->time_base_count);
458 GET_V(stc->msb_pts_shift, tmp < 16);
459 stc->max_pts_distance = ffio_read_varlen(bc);
460 GET_V(stc->decode_delay, tmp < 1000); // sanity limit, raise this if Moore's law is true
461 st->codec->has_b_frames = stc->decode_delay;
462 ffio_read_varlen(bc); // stream flags
464 GET_V(st->codec->extradata_size, tmp < (1 << 30));
465 if (st->codec->extradata_size) {
466 if (ff_get_extradata(st->codec, bc, st->codec->extradata_size) < 0)
467 return AVERROR(ENOMEM);
470 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
471 GET_V(st->codec->width, tmp > 0);
472 GET_V(st->codec->height, tmp > 0);
473 st->sample_aspect_ratio.num = ffio_read_varlen(bc);
474 st->sample_aspect_ratio.den = ffio_read_varlen(bc);
475 if ((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)) {
476 av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n",
477 st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
478 ret = AVERROR_INVALIDDATA;
481 ffio_read_varlen(bc); /* csp type */
482 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
483 GET_V(st->codec->sample_rate, tmp > 0);
484 ffio_read_varlen(bc); // samplerate_den
485 GET_V(st->codec->channels, tmp > 0);
487 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
488 av_log(s, AV_LOG_ERROR,
489 "stream header %d checksum mismatch\n", stream_id);
490 ret = AVERROR_INVALIDDATA;
493 stc->time_base = &nut->time_base[stc->time_base_id];
494 avpriv_set_pts_info(s->streams[stream_id], 63, stc->time_base->num,
495 stc->time_base->den);
498 if (st && st->codec) {
499 av_freep(&st->codec->extradata);
500 st->codec->extradata_size = 0;
505 static void set_disposition_bits(AVFormatContext *avf, char *value,
510 for (i = 0; ff_nut_dispositions[i].flag; ++i)
511 if (!strcmp(ff_nut_dispositions[i].str, value))
512 flag = ff_nut_dispositions[i].flag;
514 av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value);
515 for (i = 0; i < avf->nb_streams; ++i)
516 if (stream_id == i || stream_id == -1)
517 avf->streams[i]->disposition |= flag;
520 static int decode_info_header(NUTContext *nut)
522 AVFormatContext *s = nut->avf;
523 AVIOContext *bc = s->pb;
524 uint64_t tmp, chapter_start, chapter_len;
525 unsigned int stream_id_plus1, count;
526 int chapter_id, i, ret = 0;
528 char name[256], str_value[1024], type_str[256];
530 int *event_flags = NULL;
531 AVChapter *chapter = NULL;
533 AVDictionary **metadata = NULL;
534 int metadata_flag = 0;
536 end = get_packetheader(nut, bc, 1, INFO_STARTCODE);
537 end += avio_tell(bc);
539 GET_V(stream_id_plus1, tmp <= s->nb_streams);
540 chapter_id = get_s(bc);
541 chapter_start = ffio_read_varlen(bc);
542 chapter_len = ffio_read_varlen(bc);
543 count = ffio_read_varlen(bc);
545 if (chapter_id && !stream_id_plus1) {
546 int64_t start = chapter_start / nut->time_base_count;
547 chapter = avpriv_new_chapter(s, chapter_id,
548 nut->time_base[chapter_start %
549 nut->time_base_count],
550 start, start + chapter_len, NULL);
552 av_log(s, AV_LOG_ERROR, "Could not create chapter.\n");
553 return AVERROR(ENOMEM);
555 metadata = &chapter->metadata;
556 } else if (stream_id_plus1) {
557 st = s->streams[stream_id_plus1 - 1];
558 metadata = &st->metadata;
559 event_flags = &st->event_flags;
560 metadata_flag = AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
562 metadata = &s->metadata;
563 event_flags = &s->event_flags;
564 metadata_flag = AVFMT_EVENT_FLAG_METADATA_UPDATED;
567 for (i = 0; i < count; i++) {
568 ret = get_str(bc, name, sizeof(name));
570 av_log(s, AV_LOG_ERROR, "get_str failed while decoding info header\n");
578 ret = get_str(bc, str_value, sizeof(str_value));
579 } else if (value == -2) {
580 ret = get_str(bc, type_str, sizeof(type_str));
582 av_log(s, AV_LOG_ERROR, "get_str failed while decoding info header\n");
586 ret = get_str(bc, str_value, sizeof(str_value));
587 } else if (value == -3) {
590 } else if (value == -4) {
592 value = ffio_read_varlen(bc);
593 } else if (value < -4) {
601 av_log(s, AV_LOG_ERROR, "get_str failed while decoding info header\n");
605 if (stream_id_plus1 > s->nb_streams) {
606 av_log(s, AV_LOG_WARNING,
607 "invalid stream id %d for info packet\n",
612 if (!strcmp(type, "UTF-8")) {
613 if (chapter_id == 0 && !strcmp(name, "Disposition")) {
614 set_disposition_bits(s, str_value, stream_id_plus1 - 1);
618 if (stream_id_plus1 && !strcmp(name, "r_frame_rate")) {
619 sscanf(str_value, "%d/%d", &st->r_frame_rate.num, &st->r_frame_rate.den);
620 if (st->r_frame_rate.num >= 1000LL*st->r_frame_rate.den ||
621 st->r_frame_rate.num < 0 || st->r_frame_rate.num < 0)
622 st->r_frame_rate.num = st->r_frame_rate.den = 0;
626 if (metadata && av_strcasecmp(name, "Uses") &&
627 av_strcasecmp(name, "Depends") && av_strcasecmp(name, "Replaces")) {
629 *event_flags |= metadata_flag;
630 av_dict_set(metadata, name, str_value, 0);
635 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
636 av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n");
637 return AVERROR_INVALIDDATA;
640 return FFMIN(ret, 0);
643 static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr)
645 AVFormatContext *s = nut->avf;
646 AVIOContext *bc = s->pb;
651 nut->last_syncpoint_pos = avio_tell(bc) - 8;
653 end = get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);
654 end += avio_tell(bc);
656 tmp = ffio_read_varlen(bc);
657 *back_ptr = nut->last_syncpoint_pos - 16 * ffio_read_varlen(bc);
659 return AVERROR_INVALIDDATA;
661 ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count],
662 tmp / nut->time_base_count);
664 if (nut->flags & NUT_BROADCAST) {
665 tmp = ffio_read_varlen(bc);
666 av_log(s, AV_LOG_VERBOSE, "Syncpoint wallclock %"PRId64"\n",
667 av_rescale_q(tmp / nut->time_base_count,
668 nut->time_base[tmp % nut->time_base_count],
672 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
673 av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n");
674 return AVERROR_INVALIDDATA;
677 *ts = tmp / nut->time_base_count *
678 av_q2d(nut->time_base[tmp % nut->time_base_count]) * AV_TIME_BASE;
680 if ((ret = ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts)) < 0)
686 //FIXME calculate exactly, this is just a good approximation.
687 static int64_t find_duration(NUTContext *nut, int64_t filesize)
689 AVFormatContext *s = nut->avf;
690 int64_t duration = 0;
692 ff_find_last_ts(s, -1, &duration, NULL, nut_read_timestamp);
695 s->duration_estimation_method = AVFMT_DURATION_FROM_PTS;
699 static int find_and_decode_index(NUTContext *nut)
701 AVFormatContext *s = nut->avf;
702 AVIOContext *bc = s->pb;
704 int i, j, syncpoint_count;
705 int64_t filesize = avio_size(bc);
706 int64_t *syncpoints = NULL;
708 int8_t *has_keyframe = NULL;
709 int ret = AVERROR_INVALIDDATA;
714 avio_seek(bc, filesize - 12, SEEK_SET);
715 avio_seek(bc, filesize - avio_rb64(bc), SEEK_SET);
716 if (avio_rb64(bc) != INDEX_STARTCODE) {
717 av_log(s, AV_LOG_WARNING, "no index at the end\n");
720 s->duration = find_duration(nut, filesize);
724 end = get_packetheader(nut, bc, 1, INDEX_STARTCODE);
725 end += avio_tell(bc);
727 max_pts = ffio_read_varlen(bc);
728 s->duration = av_rescale_q(max_pts / nut->time_base_count,
729 nut->time_base[max_pts % nut->time_base_count],
731 s->duration_estimation_method = AVFMT_DURATION_FROM_PTS;
733 GET_V(syncpoint_count, tmp < INT_MAX / 8 && tmp > 0);
734 syncpoints = av_malloc_array(syncpoint_count, sizeof(int64_t));
735 has_keyframe = av_malloc_array(syncpoint_count + 1, sizeof(int8_t));
736 if (!syncpoints || !has_keyframe) {
737 ret = AVERROR(ENOMEM);
740 for (i = 0; i < syncpoint_count; i++) {
741 syncpoints[i] = ffio_read_varlen(bc);
742 if (syncpoints[i] <= 0)
745 syncpoints[i] += syncpoints[i - 1];
748 for (i = 0; i < s->nb_streams; i++) {
749 int64_t last_pts = -1;
750 for (j = 0; j < syncpoint_count;) {
751 uint64_t x = ffio_read_varlen(bc);
758 if (n + x >= syncpoint_count + 1) {
759 av_log(s, AV_LOG_ERROR, "index overflow A %d + %"PRIu64" >= %d\n", n, x, syncpoint_count + 1);
763 has_keyframe[n++] = flag;
764 has_keyframe[n++] = !flag;
767 av_log(s, AV_LOG_ERROR, "index: x %"PRIu64" is invalid\n", x);
771 if (n >= syncpoint_count + 1) {
772 av_log(s, AV_LOG_ERROR, "index overflow B\n");
775 has_keyframe[n++] = x & 1;
779 if (has_keyframe[0]) {
780 av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n");
783 av_assert0(n <= syncpoint_count + 1);
784 for (; j < n && j < syncpoint_count; j++) {
785 if (has_keyframe[j]) {
786 uint64_t B, A = ffio_read_varlen(bc);
788 A = ffio_read_varlen(bc);
789 B = ffio_read_varlen(bc);
790 // eor_pts[j][i] = last_pts + A + B
793 av_add_index_entry(s->streams[i], 16 * syncpoints[j - 1],
794 last_pts + A, 0, 0, AVINDEX_KEYFRAME);
801 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
802 av_log(s, AV_LOG_ERROR, "index checksum mismatch\n");
809 av_free(has_keyframe);
813 static int nut_read_close(AVFormatContext *s)
815 NUTContext *nut = s->priv_data;
818 av_freep(&nut->time_base);
819 av_freep(&nut->stream);
821 for (i = 1; i < nut->header_count; i++)
822 av_freep(&nut->header[i]);
827 static int nut_read_header(AVFormatContext *s)
829 NUTContext *nut = s->priv_data;
830 AVIOContext *bc = s->pb;
832 int initialized_stream_count;
839 pos = find_startcode(bc, MAIN_STARTCODE, pos) + 1;
841 av_log(s, AV_LOG_ERROR, "No main startcode found.\n");
844 } while (decode_main_header(nut) < 0);
848 for (initialized_stream_count = 0; initialized_stream_count < s->nb_streams;) {
849 pos = find_startcode(bc, STREAM_STARTCODE, pos) + 1;
851 av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n");
854 if (decode_stream_header(nut) >= 0)
855 initialized_stream_count++;
861 uint64_t startcode = find_any_startcode(bc, pos);
864 if (startcode == 0) {
865 av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
867 } else if (startcode == SYNCPOINT_STARTCODE) {
868 nut->next_startcode = startcode;
870 } else if (startcode != INFO_STARTCODE) {
874 decode_info_header(nut);
877 s->internal->data_offset = pos - 8;
880 int64_t orig_pos = avio_tell(bc);
881 find_and_decode_index(nut);
882 avio_seek(bc, orig_pos, SEEK_SET);
884 av_assert0(nut->next_startcode == SYNCPOINT_STARTCODE);
886 ff_metadata_conv_ctx(s, NULL, ff_nut_metadata_conv);
893 return AVERROR_INVALIDDATA;
896 static int read_sm_data(AVFormatContext *s, AVIOContext *bc, AVPacket *pkt, int is_meta, int64_t maxpos)
898 int count = ffio_read_varlen(bc);
902 int64_t channel_layout = 0;
908 for (i=0; i<count; i++) {
909 uint8_t name[256], str_value[256], type_str[256];
911 if (avio_tell(bc) >= maxpos)
912 return AVERROR_INVALIDDATA;
913 ret = get_str(bc, name, sizeof(name));
915 av_log(s, AV_LOG_ERROR, "get_str failed while reading sm data\n");
921 ret = get_str(bc, str_value, sizeof(str_value));
923 av_log(s, AV_LOG_ERROR, "get_str failed while reading sm data\n");
926 av_log(s, AV_LOG_WARNING, "Unknown string %s / %s\n", name, str_value);
927 } else if (value == -2) {
929 int64_t v64, value_len;
931 ret = get_str(bc, type_str, sizeof(type_str));
933 av_log(s, AV_LOG_ERROR, "get_str failed while reading sm data\n");
936 value_len = ffio_read_varlen(bc);
937 if (value_len < 0 || value_len >= maxpos - avio_tell(bc))
938 return AVERROR_INVALIDDATA;
939 if (!strcmp(name, "Palette")) {
940 dst = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, value_len);
941 } else if (!strcmp(name, "Extradata")) {
942 dst = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, value_len);
943 } else if (sscanf(name, "CodecSpecificSide%"SCNd64"", &v64) == 1) {
944 dst = av_packet_new_side_data(pkt, AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL, value_len + 8);
946 return AVERROR(ENOMEM);
949 } else if (!strcmp(name, "ChannelLayout") && value_len == 8) {
950 channel_layout = avio_rl64(bc);
953 av_log(s, AV_LOG_WARNING, "Unknown data %s / %s\n", name, type_str);
954 avio_skip(bc, value_len);
958 return AVERROR(ENOMEM);
959 avio_read(bc, dst, value_len);
960 } else if (value == -3) {
962 } else if (value == -4) {
963 value = ffio_read_varlen(bc);
964 } else if (value < -4) {
967 if (!strcmp(name, "SkipStart")) {
969 } else if (!strcmp(name, "SkipEnd")) {
971 } else if (!strcmp(name, "Channels")) {
973 } else if (!strcmp(name, "SampleRate")) {
975 } else if (!strcmp(name, "Width")) {
977 } else if (!strcmp(name, "Height")) {
980 av_log(s, AV_LOG_WARNING, "Unknown integer %s\n", name);
985 if (channels || channel_layout || sample_rate || width || height) {
986 uint8_t *dst = av_packet_new_side_data(pkt, AV_PKT_DATA_PARAM_CHANGE, 28);
988 return AVERROR(ENOMEM);
989 bytestream_put_le32(&dst,
990 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT*(!!channels) +
991 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT*(!!channel_layout) +
992 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE*(!!sample_rate) +
993 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS*(!!(width|height))
996 bytestream_put_le32(&dst, channels);
998 bytestream_put_le64(&dst, channel_layout);
1000 bytestream_put_le32(&dst, sample_rate);
1001 if (width || height){
1002 bytestream_put_le32(&dst, width);
1003 bytestream_put_le32(&dst, height);
1007 if (skip_start || skip_end) {
1008 uint8_t *dst = av_packet_new_side_data(pkt, AV_PKT_DATA_SKIP_SAMPLES, 10);
1010 return AVERROR(ENOMEM);
1011 AV_WL32(dst, skip_start);
1012 AV_WL32(dst+4, skip_end);
1015 if (avio_tell(bc) >= maxpos)
1016 return AVERROR_INVALIDDATA;
1021 static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id,
1022 uint8_t *header_idx, int frame_code)
1024 AVFormatContext *s = nut->avf;
1025 AVIOContext *bc = s->pb;
1027 int size, flags, size_mul, pts_delta, i, reserved_count, ret;
1030 if (!(nut->flags & NUT_PIPE) &&
1031 avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance) {
1032 av_log(s, AV_LOG_ERROR,
1033 "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n",
1034 avio_tell(bc), nut->last_syncpoint_pos, nut->max_distance);
1035 return AVERROR_INVALIDDATA;
1038 flags = nut->frame_code[frame_code].flags;
1039 size_mul = nut->frame_code[frame_code].size_mul;
1040 size = nut->frame_code[frame_code].size_lsb;
1041 *stream_id = nut->frame_code[frame_code].stream_id;
1042 pts_delta = nut->frame_code[frame_code].pts_delta;
1043 reserved_count = nut->frame_code[frame_code].reserved_count;
1044 *header_idx = nut->frame_code[frame_code].header_idx;
1046 if (flags & FLAG_INVALID)
1047 return AVERROR_INVALIDDATA;
1048 if (flags & FLAG_CODED)
1049 flags ^= ffio_read_varlen(bc);
1050 if (flags & FLAG_STREAM_ID) {
1051 GET_V(*stream_id, tmp < s->nb_streams);
1053 stc = &nut->stream[*stream_id];
1054 if (flags & FLAG_CODED_PTS) {
1055 int coded_pts = ffio_read_varlen(bc);
1056 // FIXME check last_pts validity?
1057 if (coded_pts < (1 << stc->msb_pts_shift)) {
1058 *pts = ff_lsb2full(stc, coded_pts);
1060 *pts = coded_pts - (1LL << stc->msb_pts_shift);
1062 *pts = stc->last_pts + pts_delta;
1063 if (flags & FLAG_SIZE_MSB)
1064 size += size_mul * ffio_read_varlen(bc);
1065 if (flags & FLAG_MATCH_TIME)
1067 if (flags & FLAG_HEADER_IDX)
1068 *header_idx = ffio_read_varlen(bc);
1069 if (flags & FLAG_RESERVED)
1070 reserved_count = ffio_read_varlen(bc);
1071 for (i = 0; i < reserved_count; i++) {
1072 if (bc->eof_reached) {
1073 av_log(s, AV_LOG_ERROR, "reached EOF while decoding frame header\n");
1074 return AVERROR_INVALIDDATA;
1076 ffio_read_varlen(bc);
1079 if (*header_idx >= (unsigned)nut->header_count) {
1080 av_log(s, AV_LOG_ERROR, "header_idx invalid\n");
1081 return AVERROR_INVALIDDATA;
1085 size -= nut->header_len[*header_idx];
1087 if (flags & FLAG_CHECKSUM) {
1088 avio_rb32(bc); // FIXME check this
1089 } else if (!(nut->flags & NUT_PIPE) &&
1090 size > 2 * nut->max_distance ||
1091 FFABS(stc->last_pts - *pts) > stc->max_pts_distance) {
1092 av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n");
1093 return AVERROR_INVALIDDATA;
1096 stc->last_pts = *pts;
1097 stc->last_flags = flags;
1104 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code)
1106 AVFormatContext *s = nut->avf;
1107 AVIOContext *bc = s->pb;
1108 int size, stream_id, discard, ret;
1109 int64_t pts, last_IP_pts;
1113 size = decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code);
1117 stc = &nut->stream[stream_id];
1119 if (stc->last_flags & FLAG_KEY)
1120 stc->skip_until_key_frame = 0;
1122 discard = s->streams[stream_id]->discard;
1123 last_IP_pts = s->streams[stream_id]->last_IP_pts;
1124 if ((discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY)) ||
1125 (discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE &&
1126 last_IP_pts > pts) ||
1127 discard >= AVDISCARD_ALL ||
1128 stc->skip_until_key_frame) {
1129 avio_skip(bc, size);
1133 ret = av_new_packet(pkt, size + nut->header_len[header_idx]);
1136 if (nut->header[header_idx])
1137 memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]);
1138 pkt->pos = avio_tell(bc); // FIXME
1139 if (stc->last_flags & FLAG_SM_DATA) {
1141 if (read_sm_data(s, bc, pkt, 0, pkt->pos + size) < 0) {
1142 ret = AVERROR_INVALIDDATA;
1145 if (read_sm_data(s, bc, pkt, 1, pkt->pos + size) < 0) {
1146 ret = AVERROR_INVALIDDATA;
1149 sm_size = avio_tell(bc) - pkt->pos;
1151 pkt->size -= sm_size;
1154 ret = avio_read(bc, pkt->data + nut->header_len[header_idx], size);
1159 av_shrink_packet(pkt, nut->header_len[header_idx] + ret);
1161 pkt->stream_index = stream_id;
1162 if (stc->last_flags & FLAG_KEY)
1163 pkt->flags |= AV_PKT_FLAG_KEY;
1168 av_packet_unref(pkt);
1172 static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
1174 NUTContext *nut = s->priv_data;
1175 AVIOContext *bc = s->pb;
1176 int i, frame_code = 0, ret, skip;
1177 int64_t ts, back_ptr;
1180 int64_t pos = avio_tell(bc);
1181 uint64_t tmp = nut->next_startcode;
1182 nut->next_startcode = 0;
1187 frame_code = avio_r8(bc);
1190 if (frame_code == 'N') {
1192 for (i = 1; i < 8; i++)
1193 tmp = (tmp << 8) + avio_r8(bc);
1197 case MAIN_STARTCODE:
1198 case STREAM_STARTCODE:
1199 case INDEX_STARTCODE:
1200 skip = get_packetheader(nut, bc, 0, tmp);
1201 avio_skip(bc, skip);
1203 case INFO_STARTCODE:
1204 if (decode_info_header(nut) < 0)
1207 case SYNCPOINT_STARTCODE:
1208 if (decode_syncpoint(nut, &ts, &back_ptr) < 0)
1210 frame_code = avio_r8(bc);
1212 ret = decode_frame(nut, pkt, frame_code);
1215 else if (ret == 1) // OK but discard packet
1219 av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos);
1220 tmp = find_any_startcode(bc, FFMAX(nut->last_syncpoint_pos, nut->last_resync_pos) + 1);
1221 nut->last_resync_pos = avio_tell(bc);
1223 return AVERROR_INVALIDDATA;
1224 av_log(s, AV_LOG_DEBUG, "sync\n");
1225 nut->next_startcode = tmp;
1230 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,
1231 int64_t *pos_arg, int64_t pos_limit)
1233 NUTContext *nut = s->priv_data;
1234 AVIOContext *bc = s->pb;
1235 int64_t pos, pts, back_ptr;
1236 av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n",
1237 stream_index, *pos_arg, pos_limit);
1241 pos = find_startcode(bc, SYNCPOINT_STARTCODE, pos) + 1;
1243 av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n");
1244 return AV_NOPTS_VALUE;
1246 } while (decode_syncpoint(nut, &pts, &back_ptr) < 0);
1248 av_assert0(nut->last_syncpoint_pos == *pos_arg);
1250 av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts, back_ptr);
1251 if (stream_index == -2)
1253 av_assert0(stream_index == -1);
1257 static int read_seek(AVFormatContext *s, int stream_index,
1258 int64_t pts, int flags)
1260 NUTContext *nut = s->priv_data;
1261 AVStream *st = s->streams[stream_index];
1262 Syncpoint dummy = { .ts = pts * av_q2d(st->time_base) * AV_TIME_BASE };
1263 Syncpoint nopts_sp = { .ts = AV_NOPTS_VALUE, .back_ptr = AV_NOPTS_VALUE };
1264 Syncpoint *sp, *next_node[2] = { &nopts_sp, &nopts_sp };
1265 int64_t pos, pos2, ts;
1268 if (nut->flags & NUT_PIPE) {
1269 return AVERROR(ENOSYS);
1272 if (st->index_entries) {
1273 int index = av_index_search_timestamp(st, pts, flags);
1275 index = av_index_search_timestamp(st, pts, flags ^ AVSEEK_FLAG_BACKWARD);
1279 pos2 = st->index_entries[index].pos;
1280 ts = st->index_entries[index].timestamp;
1282 av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pts_cmp,
1283 (void **) next_node);
1284 av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n",
1285 next_node[0]->pos, next_node[1]->pos, next_node[0]->ts,
1287 pos = ff_gen_search(s, -1, dummy.ts, next_node[0]->pos,
1288 next_node[1]->pos, next_node[1]->pos,
1289 next_node[0]->ts, next_node[1]->ts,
1290 AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp);
1294 if (!(flags & AVSEEK_FLAG_BACKWARD)) {
1295 dummy.pos = pos + 16;
1296 next_node[1] = &nopts_sp;
1297 av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pos_cmp,
1298 (void **) next_node);
1299 pos2 = ff_gen_search(s, -2, dummy.pos, next_node[0]->pos,
1300 next_node[1]->pos, next_node[1]->pos,
1301 next_node[0]->back_ptr, next_node[1]->back_ptr,
1302 flags, &ts, nut_read_timestamp);
1305 // FIXME dir but I think it does not matter
1308 sp = av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pos_cmp,
1312 pos2 = sp->back_ptr - 15;
1314 av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2);
1315 pos = find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2);
1316 avio_seek(s->pb, pos, SEEK_SET);
1317 nut->last_syncpoint_pos = pos;
1318 av_log(NULL, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos);
1319 if (pos2 > pos || pos2 + 15 < pos)
1320 av_log(NULL, AV_LOG_ERROR, "no syncpoint at backptr pos\n");
1321 for (i = 0; i < s->nb_streams; i++)
1322 nut->stream[i].skip_until_key_frame = 1;
1324 nut->last_resync_pos = 0;
1329 AVInputFormat ff_nut_demuxer = {
1331 .long_name = NULL_IF_CONFIG_SMALL("NUT"),
1332 .flags = AVFMT_SEEK_TO_PTS,
1333 .priv_data_size = sizeof(NUTContext),
1334 .read_probe = nut_probe,
1335 .read_header = nut_read_header,
1336 .read_packet = nut_read_packet,
1337 .read_close = nut_read_close,
1338 .read_seek = read_seek,
1339 .extensions = "nut",
1340 .codec_tag = ff_nut_codec_tags,