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) {
53 string[FFMIN(len, maxlen - 1)] = 0;
61 static int64_t get_s(AVIOContext *bc)
63 int64_t v = ffio_read_varlen(bc) + 1;
71 static uint64_t get_fourcc(AVIOContext *bc)
73 unsigned int len = ffio_read_varlen(bc);
80 av_log(NULL, AV_LOG_ERROR, "Unsupported fourcc length %d\n", len);
86 static inline uint64_t get_v_trace(AVIOContext *bc, const char *file,
87 const char *func, int line)
89 uint64_t v = ffio_read_varlen(bc);
91 av_log(NULL, AV_LOG_DEBUG, "get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n",
92 v, v, file, func, line);
96 static inline int64_t get_s_trace(AVIOContext *bc, const char *file,
97 const char *func, int line)
99 int64_t v = get_s(bc);
101 av_log(NULL, AV_LOG_DEBUG, "get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n",
102 v, v, file, func, line);
106 static inline uint64_t get_4cc_trace(AVIOContext *bc, char *file,
107 char *func, int line)
109 uint64_t v = get_fourcc(bc);
111 av_log(NULL, AV_LOG_DEBUG, "get_fourcc %5"PRId64" / %"PRIX64" in %s %s:%d\n",
112 v, v, file, func, line);
115 #define ffio_read_varlen(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
116 #define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
117 #define get_fourcc(bc) get_4cc_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
120 static int get_packetheader(NUTContext *nut, AVIOContext *bc,
121 int calculate_checksum, uint64_t startcode)
124 // start = avio_tell(bc) - 8;
126 startcode = av_be2ne64(startcode);
127 startcode = ff_crc04C11DB7_update(0, (uint8_t*) &startcode, 8);
129 ffio_init_checksum(bc, ff_crc04C11DB7_update, startcode);
130 size = ffio_read_varlen(bc);
133 if (ffio_get_checksum(bc) && size > 4096)
136 ffio_init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0);
141 static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos)
146 /* Note, this may fail if the stream is not seekable, but that should
147 * not matter, as in this case we simply start where we currently are */
148 avio_seek(bc, pos, SEEK_SET);
149 while (!avio_feof(bc)) {
150 state = (state << 8) | avio_r8(bc);
151 if ((state >> 56) != 'N')
155 case STREAM_STARTCODE:
156 case SYNCPOINT_STARTCODE:
158 case INDEX_STARTCODE:
167 * Find the given startcode.
168 * @param code the startcode
169 * @param pos the start position of the search, or -1 if the current position
170 * @return the position of the startcode or -1 if not found
172 static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos)
175 uint64_t startcode = find_any_startcode(bc, pos);
176 if (startcode == code)
177 return avio_tell(bc) - 8;
178 else if (startcode == 0)
184 static int nut_probe(AVProbeData *p)
188 for (i = 0; i < p->buf_size-8; i++) {
189 if (AV_RB32(p->buf+i) != MAIN_STARTCODE>>32)
191 if (AV_RB32(p->buf+i+4) == (MAIN_STARTCODE & 0xFFFFFFFF))
192 return AVPROBE_SCORE_MAX;
197 #define GET_V(dst, check) \
199 tmp = ffio_read_varlen(bc); \
201 av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp); \
202 return AVERROR_INVALIDDATA; \
207 static int skip_reserved(AVIOContext *bc, int64_t pos)
209 pos -= avio_tell(bc);
211 avio_seek(bc, pos, SEEK_CUR);
212 return AVERROR_INVALIDDATA;
220 static int decode_main_header(NUTContext *nut)
222 AVFormatContext *s = nut->avf;
223 AVIOContext *bc = s->pb;
225 unsigned int stream_count;
227 int tmp_stream, tmp_mul, tmp_pts, tmp_size, tmp_res, tmp_head_idx;
229 end = get_packetheader(nut, bc, 1, MAIN_STARTCODE);
230 end += avio_tell(bc);
232 nut->version = ffio_read_varlen(bc);
233 if (nut->version < NUT_MIN_VERSION &&
234 nut->version > NUT_MAX_VERSION) {
235 av_log(s, AV_LOG_ERROR, "Version %d not supported.\n",
237 return AVERROR(ENOSYS);
239 if (nut->version > 3)
240 nut->minor_version = ffio_read_varlen(bc);
242 GET_V(stream_count, tmp > 0 && tmp <= NUT_MAX_STREAMS);
244 nut->max_distance = ffio_read_varlen(bc);
245 if (nut->max_distance > 65536) {
246 av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance);
247 nut->max_distance = 65536;
250 GET_V(nut->time_base_count, tmp > 0 && tmp < INT_MAX / sizeof(AVRational));
251 nut->time_base = av_malloc_array(nut->time_base_count, sizeof(AVRational));
253 return AVERROR(ENOMEM);
255 for (i = 0; i < nut->time_base_count; i++) {
256 GET_V(nut->time_base[i].num, tmp > 0 && tmp < (1ULL << 31));
257 GET_V(nut->time_base[i].den, tmp > 0 && tmp < (1ULL << 31));
258 if (av_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1) {
259 av_log(s, AV_LOG_ERROR, "time base invalid\n");
260 return AVERROR_INVALIDDATA;
267 for (i = 0; i < 256;) {
268 int tmp_flags = ffio_read_varlen(bc);
269 int tmp_fields = ffio_read_varlen(bc);
274 tmp_mul = ffio_read_varlen(bc);
276 tmp_stream = ffio_read_varlen(bc);
278 tmp_size = ffio_read_varlen(bc);
282 tmp_res = ffio_read_varlen(bc);
286 count = ffio_read_varlen(bc);
288 count = tmp_mul - tmp_size;
292 tmp_head_idx = ffio_read_varlen(bc);
294 while (tmp_fields-- > 8)
295 ffio_read_varlen(bc);
297 if (count == 0 || i + count > 256) {
298 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
299 return AVERROR_INVALIDDATA;
301 if (tmp_stream >= stream_count) {
302 av_log(s, AV_LOG_ERROR, "illegal stream number\n");
303 return AVERROR_INVALIDDATA;
306 for (j = 0; j < count; j++, i++) {
308 nut->frame_code[i].flags = FLAG_INVALID;
312 nut->frame_code[i].flags = tmp_flags;
313 nut->frame_code[i].pts_delta = tmp_pts;
314 nut->frame_code[i].stream_id = tmp_stream;
315 nut->frame_code[i].size_mul = tmp_mul;
316 nut->frame_code[i].size_lsb = tmp_size + j;
317 nut->frame_code[i].reserved_count = tmp_res;
318 nut->frame_code[i].header_idx = tmp_head_idx;
321 av_assert0(nut->frame_code['N'].flags == FLAG_INVALID);
323 if (end > avio_tell(bc) + 4) {
325 GET_V(nut->header_count, tmp < 128U);
327 for (i = 1; i < nut->header_count; i++) {
329 GET_V(nut->header_len[i], tmp > 0 && tmp < 256);
330 rem -= nut->header_len[i];
332 av_log(s, AV_LOG_ERROR, "invalid elision header\n");
333 return AVERROR_INVALIDDATA;
335 hdr = av_malloc(nut->header_len[i]);
337 return AVERROR(ENOMEM);
338 avio_read(bc, hdr, nut->header_len[i]);
339 nut->header[i] = hdr;
341 av_assert0(nut->header_len[0] == 0);
344 // flags had been effectively introduced in version 4
345 if (nut->version > 3 && end > avio_tell(bc) + 4) {
346 nut->flags = ffio_read_varlen(bc);
349 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
350 av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n");
351 return AVERROR_INVALIDDATA;
354 nut->stream = av_calloc(stream_count, sizeof(StreamContext));
356 return AVERROR(ENOMEM);
357 for (i = 0; i < stream_count; i++)
358 avformat_new_stream(s, NULL);
363 static int decode_stream_header(NUTContext *nut)
365 AVFormatContext *s = nut->avf;
366 AVIOContext *bc = s->pb;
368 int class, stream_id;
372 end = get_packetheader(nut, bc, 1, STREAM_STARTCODE);
373 end += avio_tell(bc);
375 GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base);
376 stc = &nut->stream[stream_id];
377 st = s->streams[stream_id];
379 return AVERROR(ENOMEM);
381 class = ffio_read_varlen(bc);
382 tmp = get_fourcc(bc);
383 st->codec->codec_tag = tmp;
386 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
387 st->codec->codec_id = av_codec_get_id((const AVCodecTag * const []) {
390 ff_codec_movvideo_tags,
396 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
397 st->codec->codec_id = av_codec_get_id((const AVCodecTag * const []) {
400 ff_nut_audio_extra_tags,
406 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
407 st->codec->codec_id = ff_codec_get_id(ff_nut_subtitle_tags, tmp);
410 st->codec->codec_type = AVMEDIA_TYPE_DATA;
411 st->codec->codec_id = ff_codec_get_id(ff_nut_data_tags, tmp);
414 av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class);
415 return AVERROR(ENOSYS);
417 if (class < 3 && st->codec->codec_id == AV_CODEC_ID_NONE)
418 av_log(s, AV_LOG_ERROR,
419 "Unknown codec tag '0x%04x' for stream number %d\n",
420 (unsigned int) tmp, stream_id);
422 GET_V(stc->time_base_id, tmp < nut->time_base_count);
423 GET_V(stc->msb_pts_shift, tmp < 16);
424 stc->max_pts_distance = ffio_read_varlen(bc);
425 GET_V(stc->decode_delay, tmp < 1000); // sanity limit, raise this if Moore's law is true
426 st->codec->has_b_frames = stc->decode_delay;
427 ffio_read_varlen(bc); // stream flags
429 GET_V(st->codec->extradata_size, tmp < (1 << 30));
430 if (st->codec->extradata_size) {
431 if (ff_get_extradata(st->codec, bc, st->codec->extradata_size) < 0)
432 return AVERROR(ENOMEM);
435 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
436 GET_V(st->codec->width, tmp > 0);
437 GET_V(st->codec->height, tmp > 0);
438 st->sample_aspect_ratio.num = ffio_read_varlen(bc);
439 st->sample_aspect_ratio.den = ffio_read_varlen(bc);
440 if ((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)) {
441 av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n",
442 st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
443 return AVERROR_INVALIDDATA;
445 ffio_read_varlen(bc); /* csp type */
446 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
447 GET_V(st->codec->sample_rate, tmp > 0);
448 ffio_read_varlen(bc); // samplerate_den
449 GET_V(st->codec->channels, tmp > 0);
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 return AVERROR_INVALIDDATA;
456 stc->time_base = &nut->time_base[stc->time_base_id];
457 avpriv_set_pts_info(s->streams[stream_id], 63, stc->time_base->num,
458 stc->time_base->den);
462 static void set_disposition_bits(AVFormatContext *avf, char *value,
467 for (i = 0; ff_nut_dispositions[i].flag; ++i)
468 if (!strcmp(ff_nut_dispositions[i].str, value))
469 flag = ff_nut_dispositions[i].flag;
471 av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value);
472 for (i = 0; i < avf->nb_streams; ++i)
473 if (stream_id == i || stream_id == -1)
474 avf->streams[i]->disposition |= flag;
477 static int decode_info_header(NUTContext *nut)
479 AVFormatContext *s = nut->avf;
480 AVIOContext *bc = s->pb;
481 uint64_t tmp, chapter_start, chapter_len;
482 unsigned int stream_id_plus1, count;
485 char name[256], str_value[1024], type_str[256];
487 int *event_flags = NULL;
488 AVChapter *chapter = NULL;
490 AVDictionary **metadata = NULL;
491 int metadata_flag = 0;
493 end = get_packetheader(nut, bc, 1, INFO_STARTCODE);
494 end += avio_tell(bc);
496 GET_V(stream_id_plus1, tmp <= s->nb_streams);
497 chapter_id = get_s(bc);
498 chapter_start = ffio_read_varlen(bc);
499 chapter_len = ffio_read_varlen(bc);
500 count = ffio_read_varlen(bc);
502 if (chapter_id && !stream_id_plus1) {
503 int64_t start = chapter_start / nut->time_base_count;
504 chapter = avpriv_new_chapter(s, chapter_id,
505 nut->time_base[chapter_start %
506 nut->time_base_count],
507 start, start + chapter_len, NULL);
509 av_log(s, AV_LOG_ERROR, "could not create chapter\n");
510 return AVERROR(ENOMEM);
512 metadata = &chapter->metadata;
513 } else if (stream_id_plus1) {
514 st = s->streams[stream_id_plus1 - 1];
515 metadata = &st->metadata;
516 event_flags = &st->event_flags;
517 metadata_flag = AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
519 metadata = &s->metadata;
520 event_flags = &s->event_flags;
521 metadata_flag = AVFMT_EVENT_FLAG_METADATA_UPDATED;
524 for (i = 0; i < count; i++) {
525 get_str(bc, name, sizeof(name));
529 get_str(bc, str_value, sizeof(str_value));
530 } else if (value == -2) {
531 get_str(bc, type_str, sizeof(type_str));
533 get_str(bc, str_value, sizeof(str_value));
534 } else if (value == -3) {
537 } else if (value == -4) {
539 value = ffio_read_varlen(bc);
540 } else if (value < -4) {
547 if (stream_id_plus1 > s->nb_streams) {
548 av_log(s, AV_LOG_ERROR, "invalid stream id for info packet\n");
552 if (!strcmp(type, "UTF-8")) {
553 if (chapter_id == 0 && !strcmp(name, "Disposition")) {
554 set_disposition_bits(s, str_value, stream_id_plus1 - 1);
558 if (stream_id_plus1 && !strcmp(name, "r_frame_rate")) {
559 sscanf(str_value, "%d/%d", &st->r_frame_rate.num, &st->r_frame_rate.den);
560 if (st->r_frame_rate.num >= 1000LL*st->r_frame_rate.den ||
561 st->r_frame_rate.num < 0 || st->r_frame_rate.num < 0)
562 st->r_frame_rate.num = st->r_frame_rate.den = 0;
566 if (metadata && av_strcasecmp(name, "Uses") &&
567 av_strcasecmp(name, "Depends") && av_strcasecmp(name, "Replaces")) {
569 *event_flags |= metadata_flag;
570 av_dict_set(metadata, name, str_value, 0);
575 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
576 av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n");
577 return AVERROR_INVALIDDATA;
582 static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr)
584 AVFormatContext *s = nut->avf;
585 AVIOContext *bc = s->pb;
590 nut->last_syncpoint_pos = avio_tell(bc) - 8;
592 end = get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);
593 end += avio_tell(bc);
595 tmp = ffio_read_varlen(bc);
596 *back_ptr = nut->last_syncpoint_pos - 16 * ffio_read_varlen(bc);
598 return AVERROR_INVALIDDATA;
600 ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count],
601 tmp / nut->time_base_count);
603 if (nut->flags & NUT_BROADCAST) {
604 tmp = ffio_read_varlen(bc);
605 av_log(s, AV_LOG_VERBOSE, "Syncpoint wallclock %"PRId64"\n",
606 av_rescale_q(tmp / nut->time_base_count,
607 nut->time_base[tmp % nut->time_base_count],
611 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
612 av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n");
613 return AVERROR_INVALIDDATA;
616 *ts = tmp / nut->time_base_count *
617 av_q2d(nut->time_base[tmp % nut->time_base_count]) * AV_TIME_BASE;
619 if ((ret = ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts)) < 0)
625 //FIXME calculate exactly, this is just a good approximation.
626 static int64_t find_duration(NUTContext *nut, int64_t filesize)
628 AVFormatContext *s = nut->avf;
629 int64_t duration = 0;
631 ff_find_last_ts(s, -1, &duration, NULL, nut_read_timestamp);
634 s->duration_estimation_method = AVFMT_DURATION_FROM_PTS;
638 static int find_and_decode_index(NUTContext *nut)
640 AVFormatContext *s = nut->avf;
641 AVIOContext *bc = s->pb;
643 int i, j, syncpoint_count;
644 int64_t filesize = avio_size(bc);
647 int8_t *has_keyframe;
648 int ret = AVERROR_INVALIDDATA;
653 avio_seek(bc, filesize - 12, SEEK_SET);
654 avio_seek(bc, filesize - avio_rb64(bc), SEEK_SET);
655 if (avio_rb64(bc) != INDEX_STARTCODE) {
656 av_log(s, AV_LOG_ERROR, "no index at the end\n");
659 s->duration = find_duration(nut, filesize);
663 end = get_packetheader(nut, bc, 1, INDEX_STARTCODE);
664 end += avio_tell(bc);
666 max_pts = ffio_read_varlen(bc);
667 s->duration = av_rescale_q(max_pts / nut->time_base_count,
668 nut->time_base[max_pts % nut->time_base_count],
670 s->duration_estimation_method = AVFMT_DURATION_FROM_PTS;
672 GET_V(syncpoint_count, tmp < INT_MAX / 8 && tmp > 0);
673 syncpoints = av_malloc_array(syncpoint_count, sizeof(int64_t));
674 has_keyframe = av_malloc_array(syncpoint_count + 1, sizeof(int8_t));
675 if (!syncpoints || !has_keyframe) {
676 ret = AVERROR(ENOMEM);
679 for (i = 0; i < syncpoint_count; i++) {
680 syncpoints[i] = ffio_read_varlen(bc);
681 if (syncpoints[i] <= 0)
684 syncpoints[i] += syncpoints[i - 1];
687 for (i = 0; i < s->nb_streams; i++) {
688 int64_t last_pts = -1;
689 for (j = 0; j < syncpoint_count;) {
690 uint64_t x = ffio_read_varlen(bc);
697 if (n + x >= syncpoint_count + 1) {
698 av_log(s, AV_LOG_ERROR, "index overflow A %d + %"PRIu64" >= %d\n", n, x, syncpoint_count + 1);
702 has_keyframe[n++] = flag;
703 has_keyframe[n++] = !flag;
706 if (n >= syncpoint_count + 1) {
707 av_log(s, AV_LOG_ERROR, "index overflow B\n");
710 has_keyframe[n++] = x & 1;
714 if (has_keyframe[0]) {
715 av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n");
718 av_assert0(n <= syncpoint_count + 1);
719 for (; j < n && j < syncpoint_count; j++) {
720 if (has_keyframe[j]) {
721 uint64_t B, A = ffio_read_varlen(bc);
723 A = ffio_read_varlen(bc);
724 B = ffio_read_varlen(bc);
725 // eor_pts[j][i] = last_pts + A + B
728 av_add_index_entry(s->streams[i], 16 * syncpoints[j - 1],
729 last_pts + A, 0, 0, AVINDEX_KEYFRAME);
736 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
737 av_log(s, AV_LOG_ERROR, "index checksum mismatch\n");
744 av_free(has_keyframe);
748 static int nut_read_header(AVFormatContext *s)
750 NUTContext *nut = s->priv_data;
751 AVIOContext *bc = s->pb;
753 int initialized_stream_count;
760 pos = find_startcode(bc, MAIN_STARTCODE, pos) + 1;
762 av_log(s, AV_LOG_ERROR, "No main startcode found.\n");
763 return AVERROR_INVALIDDATA;
765 } while (decode_main_header(nut) < 0);
769 for (initialized_stream_count = 0; initialized_stream_count < s->nb_streams;) {
770 pos = find_startcode(bc, STREAM_STARTCODE, pos) + 1;
772 av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n");
773 return AVERROR_INVALIDDATA;
775 if (decode_stream_header(nut) >= 0)
776 initialized_stream_count++;
782 uint64_t startcode = find_any_startcode(bc, pos);
785 if (startcode == 0) {
786 av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
787 return AVERROR_INVALIDDATA;
788 } else if (startcode == SYNCPOINT_STARTCODE) {
789 nut->next_startcode = startcode;
791 } else if (startcode != INFO_STARTCODE) {
795 decode_info_header(nut);
798 s->internal->data_offset = pos - 8;
801 int64_t orig_pos = avio_tell(bc);
802 find_and_decode_index(nut);
803 avio_seek(bc, orig_pos, SEEK_SET);
805 av_assert0(nut->next_startcode == SYNCPOINT_STARTCODE);
807 ff_metadata_conv_ctx(s, NULL, ff_nut_metadata_conv);
812 static int read_sm_data(AVFormatContext *s, AVIOContext *bc, AVPacket *pkt, int is_meta, int64_t maxpos)
814 int count = ffio_read_varlen(bc);
818 int64_t channel_layout = 0;
824 for (i=0; i<count; i++) {
825 uint8_t name[256], str_value[256], type_str[256];
827 if (avio_tell(bc) >= maxpos)
828 return AVERROR_INVALIDDATA;
829 get_str(bc, name, sizeof(name));
833 get_str(bc, str_value, sizeof(str_value));
834 av_log(s, AV_LOG_WARNING, "Unknown string %s / %s\n", name, str_value);
835 } else if (value == -2) {
837 int64_t v64, value_len;
839 get_str(bc, type_str, sizeof(type_str));
840 value_len = ffio_read_varlen(bc);
841 if (avio_tell(bc) + value_len >= maxpos)
842 return AVERROR_INVALIDDATA;
843 if (!strcmp(name, "Palette")) {
844 dst = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, value_len);
845 } else if (!strcmp(name, "Extradata")) {
846 dst = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, value_len);
847 } else if (sscanf(name, "CodecSpecificSide%"SCNd64"", &v64) == 1) {
848 dst = av_packet_new_side_data(pkt, AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL, value_len + 8);
850 return AVERROR(ENOMEM);
853 } else if (!strcmp(name, "ChannelLayout") && value_len == 8) {
854 channel_layout = avio_rl64(bc);
857 av_log(s, AV_LOG_WARNING, "Unknown data %s / %s\n", name, type_str);
858 avio_skip(bc, value_len);
862 return AVERROR(ENOMEM);
863 avio_read(bc, dst, value_len);
864 } else if (value == -3) {
866 } else if (value == -4) {
867 value = ffio_read_varlen(bc);
868 } else if (value < -4) {
871 if (!strcmp(name, "SkipStart")) {
873 } else if (!strcmp(name, "SkipEnd")) {
875 } else if (!strcmp(name, "Channels")) {
877 } else if (!strcmp(name, "SampleRate")) {
879 } else if (!strcmp(name, "Width")) {
881 } else if (!strcmp(name, "Height")) {
884 av_log(s, AV_LOG_WARNING, "Unknown integer %s\n", name);
889 if (channels || channel_layout || sample_rate || width || height) {
890 uint8_t *dst = av_packet_new_side_data(pkt, AV_PKT_DATA_PARAM_CHANGE, 28);
892 return AVERROR(ENOMEM);
893 bytestream_put_le32(&dst,
894 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT*(!!channels) +
895 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT*(!!channel_layout) +
896 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE*(!!sample_rate) +
897 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS*(!!(width|height))
900 bytestream_put_le32(&dst, channels);
902 bytestream_put_le64(&dst, channel_layout);
904 bytestream_put_le32(&dst, sample_rate);
905 if (width || height){
906 bytestream_put_le32(&dst, width);
907 bytestream_put_le32(&dst, height);
911 if (skip_start || skip_end) {
912 uint8_t *dst = av_packet_new_side_data(pkt, AV_PKT_DATA_SKIP_SAMPLES, 10);
914 return AVERROR(ENOMEM);
915 AV_WL32(dst, skip_start);
916 AV_WL32(dst+4, skip_end);
922 static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id,
923 uint8_t *header_idx, int frame_code)
925 AVFormatContext *s = nut->avf;
926 AVIOContext *bc = s->pb;
928 int size, flags, size_mul, pts_delta, i, reserved_count;
931 if (!(nut->flags & NUT_PIPE) &&
932 avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance) {
933 av_log(s, AV_LOG_ERROR,
934 "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n",
935 avio_tell(bc), nut->last_syncpoint_pos, nut->max_distance);
936 return AVERROR_INVALIDDATA;
939 flags = nut->frame_code[frame_code].flags;
940 size_mul = nut->frame_code[frame_code].size_mul;
941 size = nut->frame_code[frame_code].size_lsb;
942 *stream_id = nut->frame_code[frame_code].stream_id;
943 pts_delta = nut->frame_code[frame_code].pts_delta;
944 reserved_count = nut->frame_code[frame_code].reserved_count;
945 *header_idx = nut->frame_code[frame_code].header_idx;
947 if (flags & FLAG_INVALID)
948 return AVERROR_INVALIDDATA;
949 if (flags & FLAG_CODED)
950 flags ^= ffio_read_varlen(bc);
951 if (flags & FLAG_STREAM_ID) {
952 GET_V(*stream_id, tmp < s->nb_streams);
954 stc = &nut->stream[*stream_id];
955 if (flags & FLAG_CODED_PTS) {
956 int coded_pts = ffio_read_varlen(bc);
957 // FIXME check last_pts validity?
958 if (coded_pts < (1 << stc->msb_pts_shift)) {
959 *pts = ff_lsb2full(stc, coded_pts);
961 *pts = coded_pts - (1LL << stc->msb_pts_shift);
963 *pts = stc->last_pts + pts_delta;
964 if (flags & FLAG_SIZE_MSB)
965 size += size_mul * ffio_read_varlen(bc);
966 if (flags & FLAG_MATCH_TIME)
968 if (flags & FLAG_HEADER_IDX)
969 *header_idx = ffio_read_varlen(bc);
970 if (flags & FLAG_RESERVED)
971 reserved_count = ffio_read_varlen(bc);
972 for (i = 0; i < reserved_count; i++)
973 ffio_read_varlen(bc);
975 if (*header_idx >= (unsigned)nut->header_count) {
976 av_log(s, AV_LOG_ERROR, "header_idx invalid\n");
977 return AVERROR_INVALIDDATA;
981 size -= nut->header_len[*header_idx];
983 if (flags & FLAG_CHECKSUM) {
984 avio_rb32(bc); // FIXME check this
985 } else if (!(nut->flags & NUT_PIPE) &&
986 size > 2 * nut->max_distance ||
987 FFABS(stc->last_pts - *pts) > stc->max_pts_distance) {
988 av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n");
989 return AVERROR_INVALIDDATA;
992 stc->last_pts = *pts;
993 stc->last_flags = flags;
998 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code)
1000 AVFormatContext *s = nut->avf;
1001 AVIOContext *bc = s->pb;
1002 int size, stream_id, discard, ret;
1003 int64_t pts, last_IP_pts;
1007 size = decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code);
1011 stc = &nut->stream[stream_id];
1013 if (stc->last_flags & FLAG_KEY)
1014 stc->skip_until_key_frame = 0;
1016 discard = s->streams[stream_id]->discard;
1017 last_IP_pts = s->streams[stream_id]->last_IP_pts;
1018 if ((discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY)) ||
1019 (discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE &&
1020 last_IP_pts > pts) ||
1021 discard >= AVDISCARD_ALL ||
1022 stc->skip_until_key_frame) {
1023 avio_skip(bc, size);
1027 ret = av_new_packet(pkt, size + nut->header_len[header_idx]);
1030 memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]);
1031 pkt->pos = avio_tell(bc); // FIXME
1032 if (stc->last_flags & FLAG_SM_DATA) {
1034 if (read_sm_data(s, bc, pkt, 0, pkt->pos + size) < 0)
1035 return AVERROR_INVALIDDATA;
1036 if (read_sm_data(s, bc, pkt, 1, pkt->pos + size) < 0)
1037 return AVERROR_INVALIDDATA;
1038 sm_size = avio_tell(bc) - pkt->pos;
1040 pkt->size -= sm_size;
1043 ret = avio_read(bc, pkt->data + nut->header_len[header_idx], size);
1048 av_shrink_packet(pkt, nut->header_len[header_idx] + ret);
1050 pkt->stream_index = stream_id;
1051 if (stc->last_flags & FLAG_KEY)
1052 pkt->flags |= AV_PKT_FLAG_KEY;
1058 static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
1060 NUTContext *nut = s->priv_data;
1061 AVIOContext *bc = s->pb;
1062 int i, frame_code = 0, ret, skip;
1063 int64_t ts, back_ptr;
1066 int64_t pos = avio_tell(bc);
1067 uint64_t tmp = nut->next_startcode;
1068 nut->next_startcode = 0;
1073 frame_code = avio_r8(bc);
1076 if (frame_code == 'N') {
1078 for (i = 1; i < 8; i++)
1079 tmp = (tmp << 8) + avio_r8(bc);
1083 case MAIN_STARTCODE:
1084 case STREAM_STARTCODE:
1085 case INDEX_STARTCODE:
1086 skip = get_packetheader(nut, bc, 0, tmp);
1087 avio_skip(bc, skip);
1089 case INFO_STARTCODE:
1090 if (decode_info_header(nut) < 0)
1093 case SYNCPOINT_STARTCODE:
1094 if (decode_syncpoint(nut, &ts, &back_ptr) < 0)
1096 frame_code = avio_r8(bc);
1098 ret = decode_frame(nut, pkt, frame_code);
1101 else if (ret == 1) // OK but discard packet
1105 av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos);
1106 tmp = find_any_startcode(bc, nut->last_syncpoint_pos + 1);
1108 return AVERROR_INVALIDDATA;
1109 av_log(s, AV_LOG_DEBUG, "sync\n");
1110 nut->next_startcode = tmp;
1115 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,
1116 int64_t *pos_arg, int64_t pos_limit)
1118 NUTContext *nut = s->priv_data;
1119 AVIOContext *bc = s->pb;
1120 int64_t pos, pts, back_ptr;
1121 av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n",
1122 stream_index, *pos_arg, pos_limit);
1126 pos = find_startcode(bc, SYNCPOINT_STARTCODE, pos) + 1;
1128 av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n");
1129 return AV_NOPTS_VALUE;
1131 } while (decode_syncpoint(nut, &pts, &back_ptr) < 0);
1133 av_assert0(nut->last_syncpoint_pos == *pos_arg);
1135 av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts, back_ptr);
1136 if (stream_index == -2)
1138 av_assert0(stream_index == -1);
1142 static int read_seek(AVFormatContext *s, int stream_index,
1143 int64_t pts, int flags)
1145 NUTContext *nut = s->priv_data;
1146 AVStream *st = s->streams[stream_index];
1147 Syncpoint dummy = { .ts = pts * av_q2d(st->time_base) * AV_TIME_BASE };
1148 Syncpoint nopts_sp = { .ts = AV_NOPTS_VALUE, .back_ptr = AV_NOPTS_VALUE };
1149 Syncpoint *sp, *next_node[2] = { &nopts_sp, &nopts_sp };
1150 int64_t pos, pos2, ts;
1153 if (nut->flags & NUT_PIPE) {
1154 return AVERROR(ENOSYS);
1157 if (st->index_entries) {
1158 int index = av_index_search_timestamp(st, pts, flags);
1160 index = av_index_search_timestamp(st, pts, flags ^ AVSEEK_FLAG_BACKWARD);
1164 pos2 = st->index_entries[index].pos;
1165 ts = st->index_entries[index].timestamp;
1167 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pts_cmp,
1168 (void **) next_node);
1169 av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n",
1170 next_node[0]->pos, next_node[1]->pos, next_node[0]->ts,
1172 pos = ff_gen_search(s, -1, dummy.ts, next_node[0]->pos,
1173 next_node[1]->pos, next_node[1]->pos,
1174 next_node[0]->ts, next_node[1]->ts,
1175 AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp);
1177 if (!(flags & AVSEEK_FLAG_BACKWARD)) {
1178 dummy.pos = pos + 16;
1179 next_node[1] = &nopts_sp;
1180 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
1181 (void **) next_node);
1182 pos2 = ff_gen_search(s, -2, dummy.pos, next_node[0]->pos,
1183 next_node[1]->pos, next_node[1]->pos,
1184 next_node[0]->back_ptr, next_node[1]->back_ptr,
1185 flags, &ts, nut_read_timestamp);
1188 // FIXME dir but I think it does not matter
1191 sp = av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
1195 pos2 = sp->back_ptr - 15;
1197 av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2);
1198 pos = find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2);
1199 avio_seek(s->pb, pos, SEEK_SET);
1200 av_log(NULL, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos);
1201 if (pos2 > pos || pos2 + 15 < pos)
1202 av_log(NULL, AV_LOG_ERROR, "no syncpoint at backptr pos\n");
1203 for (i = 0; i < s->nb_streams; i++)
1204 nut->stream[i].skip_until_key_frame = 1;
1209 static int nut_read_close(AVFormatContext *s)
1211 NUTContext *nut = s->priv_data;
1214 av_freep(&nut->time_base);
1215 av_freep(&nut->stream);
1216 ff_nut_free_sp(nut);
1217 for (i = 1; i < nut->header_count; i++)
1218 av_freep(&nut->header[i]);
1223 AVInputFormat ff_nut_demuxer = {
1225 .long_name = NULL_IF_CONFIG_SMALL("NUT"),
1226 .flags = AVFMT_SEEK_TO_PTS,
1227 .priv_data_size = sizeof(NUTContext),
1228 .read_probe = nut_probe,
1229 .read_header = nut_read_header,
1230 .read_packet = nut_read_packet,
1231 .read_close = nut_read_close,
1232 .read_seek = read_seek,
1233 .extensions = "nut",
1234 .codec_tag = ff_nut_codec_tags,