2 * "NUT" Container Format demuxer
3 * Copyright (c) 2004-2006 Michael Niedermayer
4 * Copyright (c) 2003 Alex Beregszaszi
6 * This file is part of Libav.
8 * Libav 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 * Libav 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 Libav; 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/bswap.h"
25 #include "libavutil/dict.h"
26 #include "libavutil/mathematics.h"
27 #include "libavutil/tree.h"
28 #include "avio_internal.h"
34 #define NUT_MAX_STREAMS 256 /* arbitrary sanity check value */
36 static int get_str(AVIOContext *bc, char *string, unsigned int maxlen)
38 unsigned int len = ffio_read_varlen(bc);
41 avio_read(bc, string, FFMIN(len, maxlen));
42 while (len > maxlen) {
48 string[FFMIN(len, maxlen - 1)] = 0;
56 static int64_t get_s(AVIOContext *bc)
58 int64_t v = ffio_read_varlen(bc) + 1;
66 static uint64_t get_fourcc(AVIOContext *bc)
68 unsigned int len = ffio_read_varlen(bc);
79 static inline uint64_t get_v_trace(AVIOContext *bc, const char *file,
80 const char *func, int line)
82 uint64_t v = ffio_read_varlen(bc);
84 av_log(NULL, AV_LOG_DEBUG, "get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n",
85 v, v, file, func, line);
89 static inline int64_t get_s_trace(AVIOContext *bc, const char *file,
90 const char *func, int line)
92 int64_t v = get_s(bc);
94 av_log(NULL, AV_LOG_DEBUG, "get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n",
95 v, v, file, func, line);
99 #define ffio_read_varlen(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
100 #define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
103 static int get_packetheader(NUTContext *nut, AVIOContext *bc,
104 int calculate_checksum, uint64_t startcode)
107 // start = avio_tell(bc) - 8;
109 startcode = av_be2ne64(startcode);
110 startcode = ff_crc04C11DB7_update(0, (uint8_t*) &startcode, 8);
112 ffio_init_checksum(bc, ff_crc04C11DB7_update, startcode);
113 size = ffio_read_varlen(bc);
116 if (ffio_get_checksum(bc) && size > 4096)
119 ffio_init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0);
124 static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos)
129 /* Note, this may fail if the stream is not seekable, but that should
130 * not matter, as in this case we simply start where we currently are */
131 avio_seek(bc, pos, SEEK_SET);
132 while (!bc->eof_reached) {
133 state = (state << 8) | avio_r8(bc);
134 if ((state >> 56) != 'N')
138 case STREAM_STARTCODE:
139 case SYNCPOINT_STARTCODE:
141 case INDEX_STARTCODE:
150 * Find the given startcode.
151 * @param code the startcode
152 * @param pos the start position of the search, or -1 if the current position
153 * @return the position of the startcode or -1 if not found
155 static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos)
158 uint64_t startcode = find_any_startcode(bc, pos);
159 if (startcode == code)
160 return avio_tell(bc) - 8;
161 else if (startcode == 0)
167 static int nut_probe(AVProbeData *p)
172 for (i = 0; i < p->buf_size; i++) {
173 code = (code << 8) | p->buf[i];
174 if (code == MAIN_STARTCODE)
175 return AVPROBE_SCORE_MAX;
180 #define GET_V(dst, check) \
182 tmp = ffio_read_varlen(bc); \
184 av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp); \
190 static int skip_reserved(AVIOContext *bc, int64_t pos)
192 pos -= avio_tell(bc);
194 avio_seek(bc, pos, SEEK_CUR);
203 static int decode_main_header(NUTContext *nut)
205 AVFormatContext *s = nut->avf;
206 AVIOContext *bc = s->pb;
208 unsigned int stream_count;
210 int tmp_stream, tmp_mul, tmp_pts, tmp_size, tmp_res, tmp_head_idx;
212 end = get_packetheader(nut, bc, 1, MAIN_STARTCODE);
213 end += avio_tell(bc);
215 GET_V(tmp, tmp >= 2 && tmp <= 3);
216 GET_V(stream_count, tmp > 0 && tmp <= NUT_MAX_STREAMS);
218 nut->max_distance = ffio_read_varlen(bc);
219 if (nut->max_distance > 65536) {
220 av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance);
221 nut->max_distance = 65536;
224 GET_V(nut->time_base_count, tmp > 0 && tmp < INT_MAX / sizeof(AVRational));
225 nut->time_base = av_malloc(nut->time_base_count * sizeof(AVRational));
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, "time base invalid\n");
232 return AVERROR_INVALIDDATA;
239 for (i = 0; i < 256;) {
240 int tmp_flags = ffio_read_varlen(bc);
241 int tmp_fields = ffio_read_varlen(bc);
246 tmp_mul = ffio_read_varlen(bc);
248 tmp_stream = ffio_read_varlen(bc);
250 tmp_size = ffio_read_varlen(bc);
254 tmp_res = ffio_read_varlen(bc);
258 count = ffio_read_varlen(bc);
260 count = tmp_mul - tmp_size;
264 tmp_head_idx = ffio_read_varlen(bc);
266 while (tmp_fields-- > 8)
267 ffio_read_varlen(bc);
269 if (count == 0 || i + count > 256) {
270 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
271 return AVERROR_INVALIDDATA;
273 if (tmp_stream >= stream_count) {
274 av_log(s, AV_LOG_ERROR, "illegal stream number\n");
275 return AVERROR_INVALIDDATA;
278 for (j = 0; j < count; j++, i++) {
280 nut->frame_code[i].flags = FLAG_INVALID;
284 nut->frame_code[i].flags = tmp_flags;
285 nut->frame_code[i].pts_delta = tmp_pts;
286 nut->frame_code[i].stream_id = tmp_stream;
287 nut->frame_code[i].size_mul = tmp_mul;
288 nut->frame_code[i].size_lsb = tmp_size + j;
289 nut->frame_code[i].reserved_count = tmp_res;
290 nut->frame_code[i].header_idx = tmp_head_idx;
293 assert(nut->frame_code['N'].flags == FLAG_INVALID);
295 if (end > avio_tell(bc) + 4) {
297 GET_V(nut->header_count, tmp < 128U);
299 for (i = 1; i < nut->header_count; i++) {
301 GET_V(nut->header_len[i], tmp > 0 && tmp < 256);
302 rem -= nut->header_len[i];
304 av_log(s, AV_LOG_ERROR, "invalid elision header\n");
305 return AVERROR_INVALIDDATA;
307 hdr = av_malloc(nut->header_len[i]);
309 return AVERROR(ENOMEM);
310 avio_read(bc, hdr, nut->header_len[i]);
311 nut->header[i] = hdr;
313 assert(nut->header_len[0] == 0);
316 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
317 av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n");
318 return AVERROR_INVALIDDATA;
321 nut->stream = av_mallocz(sizeof(StreamContext) * stream_count);
322 for (i = 0; i < stream_count; i++)
323 avformat_new_stream(s, NULL);
328 static int decode_stream_header(NUTContext *nut)
330 AVFormatContext *s = nut->avf;
331 AVIOContext *bc = s->pb;
333 int class, stream_id;
337 end = get_packetheader(nut, bc, 1, STREAM_STARTCODE);
338 end += avio_tell(bc);
340 GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base);
341 stc = &nut->stream[stream_id];
342 st = s->streams[stream_id];
344 return AVERROR(ENOMEM);
346 class = ffio_read_varlen(bc);
347 tmp = get_fourcc(bc);
348 st->codec->codec_tag = tmp;
351 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
352 st->codec->codec_id = av_codec_get_id((const AVCodecTag * const []) {
360 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
361 st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, tmp);
364 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
365 st->codec->codec_id = ff_codec_get_id(ff_nut_subtitle_tags, tmp);
368 st->codec->codec_type = AVMEDIA_TYPE_DATA;
371 av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class);
374 if (class < 3 && st->codec->codec_id == AV_CODEC_ID_NONE)
375 av_log(s, AV_LOG_ERROR,
376 "Unknown codec tag '0x%04x' for stream number %d\n",
377 (unsigned int) tmp, stream_id);
379 GET_V(stc->time_base_id, tmp < nut->time_base_count);
380 GET_V(stc->msb_pts_shift, tmp < 16);
381 stc->max_pts_distance = ffio_read_varlen(bc);
382 GET_V(stc->decode_delay, tmp < 1000); // sanity limit, raise this if Moore's law is true
383 st->codec->has_b_frames = stc->decode_delay;
384 ffio_read_varlen(bc); // stream flags
386 GET_V(st->codec->extradata_size, tmp < (1 << 30));
387 if (st->codec->extradata_size) {
388 st->codec->extradata = av_mallocz(st->codec->extradata_size +
389 FF_INPUT_BUFFER_PADDING_SIZE);
390 avio_read(bc, st->codec->extradata, st->codec->extradata_size);
393 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
394 GET_V(st->codec->width, tmp > 0);
395 GET_V(st->codec->height, tmp > 0);
396 st->sample_aspect_ratio.num = ffio_read_varlen(bc);
397 st->sample_aspect_ratio.den = ffio_read_varlen(bc);
398 if ((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)) {
399 av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n",
400 st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
403 ffio_read_varlen(bc); /* csp type */
404 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
405 GET_V(st->codec->sample_rate, tmp > 0);
406 ffio_read_varlen(bc); // samplerate_den
407 GET_V(st->codec->channels, tmp > 0);
409 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
410 av_log(s, AV_LOG_ERROR,
411 "stream header %d checksum mismatch\n", stream_id);
414 stc->time_base = &nut->time_base[stc->time_base_id];
415 avpriv_set_pts_info(s->streams[stream_id], 63, stc->time_base->num,
416 stc->time_base->den);
420 static void set_disposition_bits(AVFormatContext *avf, char *value,
425 for (i = 0; ff_nut_dispositions[i].flag; ++i)
426 if (!strcmp(ff_nut_dispositions[i].str, value))
427 flag = ff_nut_dispositions[i].flag;
429 av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value);
430 for (i = 0; i < avf->nb_streams; ++i)
431 if (stream_id == i || stream_id == -1)
432 avf->streams[i]->disposition |= flag;
435 static int decode_info_header(NUTContext *nut)
437 AVFormatContext *s = nut->avf;
438 AVIOContext *bc = s->pb;
439 uint64_t tmp, chapter_start, chapter_len;
440 unsigned int stream_id_plus1, count;
443 char name[256], str_value[1024], type_str[256];
445 AVChapter *chapter = NULL;
447 AVDictionary **metadata = NULL;
449 end = get_packetheader(nut, bc, 1, INFO_STARTCODE);
450 end += avio_tell(bc);
452 GET_V(stream_id_plus1, tmp <= s->nb_streams);
453 chapter_id = get_s(bc);
454 chapter_start = ffio_read_varlen(bc);
455 chapter_len = ffio_read_varlen(bc);
456 count = ffio_read_varlen(bc);
458 if (chapter_id && !stream_id_plus1) {
459 int64_t start = chapter_start / nut->time_base_count;
460 chapter = avpriv_new_chapter(s, chapter_id,
461 nut->time_base[chapter_start %
462 nut->time_base_count],
463 start, start + chapter_len, NULL);
464 metadata = &chapter->metadata;
465 } else if (stream_id_plus1) {
466 st = s->streams[stream_id_plus1 - 1];
467 metadata = &st->metadata;
469 metadata = &s->metadata;
471 for (i = 0; i < count; i++) {
472 get_str(bc, name, sizeof(name));
476 get_str(bc, str_value, sizeof(str_value));
477 } else if (value == -2) {
478 get_str(bc, type_str, sizeof(type_str));
480 get_str(bc, str_value, sizeof(str_value));
481 } else if (value == -3) {
484 } else if (value == -4) {
486 value = ffio_read_varlen(bc);
487 } else if (value < -4) {
494 if (stream_id_plus1 > s->nb_streams) {
495 av_log(s, AV_LOG_ERROR, "invalid stream id for info packet\n");
499 if (!strcmp(type, "UTF-8")) {
500 if (chapter_id == 0 && !strcmp(name, "Disposition")) {
501 set_disposition_bits(s, str_value, stream_id_plus1 - 1);
504 if (metadata && av_strcasecmp(name, "Uses") &&
505 av_strcasecmp(name, "Depends") && av_strcasecmp(name, "Replaces"))
506 av_dict_set(metadata, name, str_value, 0);
510 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
511 av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n");
517 static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr)
519 AVFormatContext *s = nut->avf;
520 AVIOContext *bc = s->pb;
523 nut->last_syncpoint_pos = avio_tell(bc) - 8;
525 end = get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);
526 end += avio_tell(bc);
528 tmp = ffio_read_varlen(bc);
529 *back_ptr = nut->last_syncpoint_pos - 16 * ffio_read_varlen(bc);
533 ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count],
534 tmp / nut->time_base_count);
536 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
537 av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n");
541 *ts = tmp / s->nb_streams *
542 av_q2d(nut->time_base[tmp % s->nb_streams]) * AV_TIME_BASE;
543 ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts);
548 static int find_and_decode_index(NUTContext *nut)
550 AVFormatContext *s = nut->avf;
551 AVIOContext *bc = s->pb;
553 int i, j, syncpoint_count;
554 int64_t filesize = avio_size(bc);
556 int8_t *has_keyframe;
559 avio_seek(bc, filesize - 12, SEEK_SET);
560 avio_seek(bc, filesize - avio_rb64(bc), SEEK_SET);
561 if (avio_rb64(bc) != INDEX_STARTCODE) {
562 av_log(s, AV_LOG_ERROR, "no index at the end\n");
566 end = get_packetheader(nut, bc, 1, INDEX_STARTCODE);
567 end += avio_tell(bc);
569 ffio_read_varlen(bc); // max_pts
570 GET_V(syncpoint_count, tmp < INT_MAX / 8 && tmp > 0);
571 syncpoints = av_malloc(sizeof(int64_t) * syncpoint_count);
572 has_keyframe = av_malloc(sizeof(int8_t) * (syncpoint_count + 1));
573 for (i = 0; i < syncpoint_count; i++) {
574 syncpoints[i] = ffio_read_varlen(bc);
575 if (syncpoints[i] <= 0)
578 syncpoints[i] += syncpoints[i - 1];
581 for (i = 0; i < s->nb_streams; i++) {
582 int64_t last_pts = -1;
583 for (j = 0; j < syncpoint_count;) {
584 uint64_t x = ffio_read_varlen(bc);
591 if (n + x >= syncpoint_count + 1) {
592 av_log(s, AV_LOG_ERROR, "index overflow A\n");
596 has_keyframe[n++] = flag;
597 has_keyframe[n++] = !flag;
600 if (n >= syncpoint_count + 1) {
601 av_log(s, AV_LOG_ERROR, "index overflow B\n");
604 has_keyframe[n++] = x & 1;
608 if (has_keyframe[0]) {
609 av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n");
612 assert(n <= syncpoint_count + 1);
613 for (; j < n && j < syncpoint_count; j++) {
614 if (has_keyframe[j]) {
615 uint64_t B, A = ffio_read_varlen(bc);
617 A = ffio_read_varlen(bc);
618 B = ffio_read_varlen(bc);
619 // eor_pts[j][i] = last_pts + A + B
622 av_add_index_entry(s->streams[i], 16 * syncpoints[j - 1],
623 last_pts + A, 0, 0, AVINDEX_KEYFRAME);
630 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
631 av_log(s, AV_LOG_ERROR, "index checksum mismatch\n");
638 av_free(has_keyframe);
642 static int nut_read_header(AVFormatContext *s)
644 NUTContext *nut = s->priv_data;
645 AVIOContext *bc = s->pb;
647 int initialized_stream_count;
654 pos = find_startcode(bc, MAIN_STARTCODE, pos) + 1;
656 av_log(s, AV_LOG_ERROR, "No main startcode found.\n");
657 return AVERROR_INVALIDDATA;
659 } while (decode_main_header(nut) < 0);
663 for (initialized_stream_count = 0; initialized_stream_count < s->nb_streams;) {
664 pos = find_startcode(bc, STREAM_STARTCODE, pos) + 1;
666 av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n");
667 return AVERROR_INVALIDDATA;
669 if (decode_stream_header(nut) >= 0)
670 initialized_stream_count++;
676 uint64_t startcode = find_any_startcode(bc, pos);
679 if (startcode == 0) {
680 av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
681 return AVERROR_INVALIDDATA;
682 } else if (startcode == SYNCPOINT_STARTCODE) {
683 nut->next_startcode = startcode;
685 } else if (startcode != INFO_STARTCODE) {
689 decode_info_header(nut);
692 s->data_offset = pos - 8;
695 int64_t orig_pos = avio_tell(bc);
696 find_and_decode_index(nut);
697 avio_seek(bc, orig_pos, SEEK_SET);
699 assert(nut->next_startcode == SYNCPOINT_STARTCODE);
701 ff_metadata_conv_ctx(s, NULL, ff_nut_metadata_conv);
706 static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id,
707 uint8_t *header_idx, int frame_code)
709 AVFormatContext *s = nut->avf;
710 AVIOContext *bc = s->pb;
712 int size, flags, size_mul, pts_delta, i, reserved_count;
715 if (avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance) {
716 av_log(s, AV_LOG_ERROR,
717 "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n",
718 avio_tell(bc), nut->last_syncpoint_pos, nut->max_distance);
719 return AVERROR_INVALIDDATA;
722 flags = nut->frame_code[frame_code].flags;
723 size_mul = nut->frame_code[frame_code].size_mul;
724 size = nut->frame_code[frame_code].size_lsb;
725 *stream_id = nut->frame_code[frame_code].stream_id;
726 pts_delta = nut->frame_code[frame_code].pts_delta;
727 reserved_count = nut->frame_code[frame_code].reserved_count;
728 *header_idx = nut->frame_code[frame_code].header_idx;
730 if (flags & FLAG_INVALID)
731 return AVERROR_INVALIDDATA;
732 if (flags & FLAG_CODED)
733 flags ^= ffio_read_varlen(bc);
734 if (flags & FLAG_STREAM_ID) {
735 GET_V(*stream_id, tmp < s->nb_streams);
737 stc = &nut->stream[*stream_id];
738 if (flags & FLAG_CODED_PTS) {
739 int coded_pts = ffio_read_varlen(bc);
740 // FIXME check last_pts validity?
741 if (coded_pts < (1 << stc->msb_pts_shift)) {
742 *pts = ff_lsb2full(stc, coded_pts);
744 *pts = coded_pts - (1 << stc->msb_pts_shift);
746 *pts = stc->last_pts + pts_delta;
747 if (flags & FLAG_SIZE_MSB)
748 size += size_mul * ffio_read_varlen(bc);
749 if (flags & FLAG_MATCH_TIME)
751 if (flags & FLAG_HEADER_IDX)
752 *header_idx = ffio_read_varlen(bc);
753 if (flags & FLAG_RESERVED)
754 reserved_count = ffio_read_varlen(bc);
755 for (i = 0; i < reserved_count; i++)
756 ffio_read_varlen(bc);
758 if (*header_idx >= (unsigned)nut->header_count) {
759 av_log(s, AV_LOG_ERROR, "header_idx invalid\n");
760 return AVERROR_INVALIDDATA;
764 size -= nut->header_len[*header_idx];
766 if (flags & FLAG_CHECKSUM) {
767 avio_rb32(bc); // FIXME check this
768 } else if (size > 2 * nut->max_distance || FFABS(stc->last_pts - *pts) >
769 stc->max_pts_distance) {
770 av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n");
771 return AVERROR_INVALIDDATA;
774 stc->last_pts = *pts;
775 stc->last_flags = flags;
780 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code)
782 AVFormatContext *s = nut->avf;
783 AVIOContext *bc = s->pb;
784 int size, stream_id, discard;
785 int64_t pts, last_IP_pts;
789 size = decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code);
793 stc = &nut->stream[stream_id];
795 if (stc->last_flags & FLAG_KEY)
796 stc->skip_until_key_frame = 0;
798 discard = s->streams[stream_id]->discard;
799 last_IP_pts = s->streams[stream_id]->last_IP_pts;
800 if ((discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY)) ||
801 (discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE &&
802 last_IP_pts > pts) ||
803 discard >= AVDISCARD_ALL ||
804 stc->skip_until_key_frame) {
809 av_new_packet(pkt, size + nut->header_len[header_idx]);
810 memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]);
811 pkt->pos = avio_tell(bc); // FIXME
812 avio_read(bc, pkt->data + nut->header_len[header_idx], size);
814 pkt->stream_index = stream_id;
815 if (stc->last_flags & FLAG_KEY)
816 pkt->flags |= AV_PKT_FLAG_KEY;
822 static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
824 NUTContext *nut = s->priv_data;
825 AVIOContext *bc = s->pb;
826 int i, frame_code = 0, ret, skip;
827 int64_t ts, back_ptr;
830 int64_t pos = avio_tell(bc);
831 uint64_t tmp = nut->next_startcode;
832 nut->next_startcode = 0;
837 frame_code = avio_r8(bc);
840 if (frame_code == 'N') {
842 for (i = 1; i < 8; i++)
843 tmp = (tmp << 8) + avio_r8(bc);
848 case STREAM_STARTCODE:
849 case INDEX_STARTCODE:
850 skip = get_packetheader(nut, bc, 0, tmp);
854 if (decode_info_header(nut) < 0)
857 case SYNCPOINT_STARTCODE:
858 if (decode_syncpoint(nut, &ts, &back_ptr) < 0)
860 frame_code = avio_r8(bc);
862 ret = decode_frame(nut, pkt, frame_code);
865 else if (ret == 1) // OK but discard packet
869 av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos);
870 tmp = find_any_startcode(bc, nut->last_syncpoint_pos + 1);
872 return AVERROR_INVALIDDATA;
873 av_log(s, AV_LOG_DEBUG, "sync\n");
874 nut->next_startcode = tmp;
879 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,
880 int64_t *pos_arg, int64_t pos_limit)
882 NUTContext *nut = s->priv_data;
883 AVIOContext *bc = s->pb;
884 int64_t pos, pts, back_ptr;
885 av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n",
886 stream_index, *pos_arg, pos_limit);
890 pos = find_startcode(bc, SYNCPOINT_STARTCODE, pos) + 1;
892 assert(nut->next_startcode == 0);
893 av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n");
894 return AV_NOPTS_VALUE;
896 } while (decode_syncpoint(nut, &pts, &back_ptr) < 0);
898 assert(nut->last_syncpoint_pos == *pos_arg);
900 av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts, back_ptr);
901 if (stream_index == -1)
903 else if (stream_index == -2)
909 static int read_seek(AVFormatContext *s, int stream_index,
910 int64_t pts, int flags)
912 NUTContext *nut = s->priv_data;
913 AVStream *st = s->streams[stream_index];
914 Syncpoint dummy = { .ts = pts * av_q2d(st->time_base) * AV_TIME_BASE };
915 Syncpoint nopts_sp = { .ts = AV_NOPTS_VALUE, .back_ptr = AV_NOPTS_VALUE };
916 Syncpoint *sp, *next_node[2] = { &nopts_sp, &nopts_sp };
917 int64_t pos, pos2, ts;
920 if (st->index_entries) {
921 int index = av_index_search_timestamp(st, pts, flags);
925 pos2 = st->index_entries[index].pos;
926 ts = st->index_entries[index].timestamp;
928 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pts_cmp,
929 (void **) next_node);
930 av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n",
931 next_node[0]->pos, next_node[1]->pos, next_node[0]->ts,
933 pos = ff_gen_search(s, -1, dummy.ts, next_node[0]->pos,
934 next_node[1]->pos, next_node[1]->pos,
935 next_node[0]->ts, next_node[1]->ts,
936 AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp);
938 if (!(flags & AVSEEK_FLAG_BACKWARD)) {
939 dummy.pos = pos + 16;
940 next_node[1] = &nopts_sp;
941 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
942 (void **) next_node);
943 pos2 = ff_gen_search(s, -2, dummy.pos, next_node[0]->pos,
944 next_node[1]->pos, next_node[1]->pos,
945 next_node[0]->back_ptr, next_node[1]->back_ptr,
946 flags, &ts, nut_read_timestamp);
949 // FIXME dir but I think it does not matter
952 sp = av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
956 pos2 = sp->back_ptr - 15;
958 av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2);
959 pos = find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2);
960 avio_seek(s->pb, pos, SEEK_SET);
961 av_log(NULL, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos);
962 if (pos2 > pos || pos2 + 15 < pos)
963 av_log(NULL, AV_LOG_ERROR, "no syncpoint at backptr pos\n");
964 for (i = 0; i < s->nb_streams; i++)
965 nut->stream[i].skip_until_key_frame = 1;
970 static int nut_read_close(AVFormatContext *s)
972 NUTContext *nut = s->priv_data;
975 av_freep(&nut->time_base);
976 av_freep(&nut->stream);
978 for (i = 1; i < nut->header_count; i++)
979 av_freep(&nut->header[i]);
984 AVInputFormat ff_nut_demuxer = {
986 .long_name = NULL_IF_CONFIG_SMALL("NUT"),
987 .priv_data_size = sizeof(NUTContext),
988 .read_probe = nut_probe,
989 .read_header = nut_read_header,
990 .read_packet = nut_read_packet,
991 .read_close = nut_read_close,
992 .read_seek = read_seek,
994 .codec_tag = ff_nut_codec_tags,