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"
35 #define NUT_MAX_STREAMS 256 /* arbitrary sanity check value */
37 static int get_str(AVIOContext *bc, char *string, unsigned int maxlen)
39 unsigned int len = ffio_read_varlen(bc);
42 avio_read(bc, string, FFMIN(len, maxlen));
43 while (len > maxlen) {
49 string[FFMIN(len, maxlen - 1)] = 0;
57 static int64_t get_s(AVIOContext *bc)
59 int64_t v = ffio_read_varlen(bc) + 1;
67 static uint64_t get_fourcc(AVIOContext *bc)
69 unsigned int len = ffio_read_varlen(bc);
80 static inline uint64_t get_v_trace(AVIOContext *bc, const char *file,
81 const char *func, int line)
83 uint64_t v = ffio_read_varlen(bc);
85 av_log(NULL, AV_LOG_DEBUG, "get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n",
86 v, v, file, func, line);
90 static inline int64_t get_s_trace(AVIOContext *bc, const char *file,
91 const char *func, int line)
93 int64_t v = get_s(bc);
95 av_log(NULL, AV_LOG_DEBUG, "get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n",
96 v, v, file, func, line);
100 #define ffio_read_varlen(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
101 #define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
104 static int get_packetheader(NUTContext *nut, AVIOContext *bc,
105 int calculate_checksum, uint64_t startcode)
108 // start = avio_tell(bc) - 8;
110 startcode = av_be2ne64(startcode);
111 startcode = ff_crc04C11DB7_update(0, (uint8_t*) &startcode, 8);
113 ffio_init_checksum(bc, ff_crc04C11DB7_update, startcode);
114 size = ffio_read_varlen(bc);
117 if (ffio_get_checksum(bc) && size > 4096)
120 ffio_init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0);
125 static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos)
130 /* Note, this may fail if the stream is not seekable, but that should
131 * not matter, as in this case we simply start where we currently are */
132 avio_seek(bc, pos, SEEK_SET);
133 while (!bc->eof_reached) {
134 state = (state << 8) | avio_r8(bc);
135 if ((state >> 56) != 'N')
139 case STREAM_STARTCODE:
140 case SYNCPOINT_STARTCODE:
142 case INDEX_STARTCODE:
151 * Find the given startcode.
152 * @param code the startcode
153 * @param pos the start position of the search, or -1 if the current position
154 * @return the position of the startcode or -1 if not found
156 static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos)
159 uint64_t startcode = find_any_startcode(bc, pos);
160 if (startcode == code)
161 return avio_tell(bc) - 8;
162 else if (startcode == 0)
168 static int nut_probe(AVProbeData *p)
173 for (i = 0; i < p->buf_size; i++) {
174 code = (code << 8) | p->buf[i];
175 if (code == MAIN_STARTCODE)
176 return AVPROBE_SCORE_MAX;
181 #define GET_V(dst, check) \
183 tmp = ffio_read_varlen(bc); \
185 av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp); \
186 return AVERROR_INVALIDDATA; \
191 static int skip_reserved(AVIOContext *bc, int64_t pos)
193 pos -= avio_tell(bc);
195 avio_seek(bc, pos, SEEK_CUR);
196 return AVERROR_INVALIDDATA;
204 static int decode_main_header(NUTContext *nut)
206 AVFormatContext *s = nut->avf;
207 AVIOContext *bc = s->pb;
209 unsigned int stream_count;
211 int tmp_stream, tmp_mul, tmp_pts, tmp_size, tmp_res, tmp_head_idx;
213 end = get_packetheader(nut, bc, 1, MAIN_STARTCODE);
214 end += avio_tell(bc);
216 tmp = ffio_read_varlen(bc);
217 if (tmp < 2 && tmp > NUT_VERSION) {
218 av_log(s, AV_LOG_ERROR, "Version %"PRId64" not supported.\n",
220 return AVERROR(ENOSYS);
223 GET_V(stream_count, tmp > 0 && tmp <= NUT_MAX_STREAMS);
225 nut->max_distance = ffio_read_varlen(bc);
226 if (nut->max_distance > 65536) {
227 av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance);
228 nut->max_distance = 65536;
231 GET_V(nut->time_base_count, tmp > 0 && tmp < INT_MAX / sizeof(AVRational));
232 nut->time_base = av_malloc(nut->time_base_count * sizeof(AVRational));
234 for (i = 0; i < nut->time_base_count; i++) {
235 GET_V(nut->time_base[i].num, tmp > 0 && tmp < (1ULL << 31));
236 GET_V(nut->time_base[i].den, tmp > 0 && tmp < (1ULL << 31));
237 if (av_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1) {
238 av_log(s, AV_LOG_ERROR, "time base invalid\n");
239 return AVERROR_INVALIDDATA;
246 for (i = 0; i < 256;) {
247 int tmp_flags = ffio_read_varlen(bc);
248 int tmp_fields = ffio_read_varlen(bc);
253 tmp_mul = ffio_read_varlen(bc);
255 tmp_stream = ffio_read_varlen(bc);
257 tmp_size = ffio_read_varlen(bc);
261 tmp_res = ffio_read_varlen(bc);
265 count = ffio_read_varlen(bc);
267 count = tmp_mul - tmp_size;
271 tmp_head_idx = ffio_read_varlen(bc);
273 while (tmp_fields-- > 8)
274 ffio_read_varlen(bc);
276 if (count == 0 || i + count > 256) {
277 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
278 return AVERROR_INVALIDDATA;
280 if (tmp_stream >= stream_count) {
281 av_log(s, AV_LOG_ERROR, "illegal stream number\n");
282 return AVERROR_INVALIDDATA;
285 for (j = 0; j < count; j++, i++) {
287 nut->frame_code[i].flags = FLAG_INVALID;
291 nut->frame_code[i].flags = tmp_flags;
292 nut->frame_code[i].pts_delta = tmp_pts;
293 nut->frame_code[i].stream_id = tmp_stream;
294 nut->frame_code[i].size_mul = tmp_mul;
295 nut->frame_code[i].size_lsb = tmp_size + j;
296 nut->frame_code[i].reserved_count = tmp_res;
297 nut->frame_code[i].header_idx = tmp_head_idx;
300 assert(nut->frame_code['N'].flags == FLAG_INVALID);
302 if (end > avio_tell(bc) + 4) {
304 GET_V(nut->header_count, tmp < 128U);
306 for (i = 1; i < nut->header_count; i++) {
308 GET_V(nut->header_len[i], tmp > 0 && tmp < 256);
309 rem -= nut->header_len[i];
311 av_log(s, AV_LOG_ERROR, "invalid elision header\n");
312 return AVERROR_INVALIDDATA;
314 hdr = av_malloc(nut->header_len[i]);
316 return AVERROR(ENOMEM);
317 avio_read(bc, hdr, nut->header_len[i]);
318 nut->header[i] = hdr;
320 assert(nut->header_len[0] == 0);
323 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
324 av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n");
325 return AVERROR_INVALIDDATA;
328 nut->stream = av_mallocz(sizeof(StreamContext) * stream_count);
329 for (i = 0; i < stream_count; i++)
330 avformat_new_stream(s, NULL);
335 static int decode_stream_header(NUTContext *nut)
337 AVFormatContext *s = nut->avf;
338 AVIOContext *bc = s->pb;
340 int class, stream_id;
344 end = get_packetheader(nut, bc, 1, STREAM_STARTCODE);
345 end += avio_tell(bc);
347 GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base);
348 stc = &nut->stream[stream_id];
349 st = s->streams[stream_id];
351 return AVERROR(ENOMEM);
353 class = ffio_read_varlen(bc);
354 tmp = get_fourcc(bc);
355 st->codec->codec_tag = tmp;
358 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
359 st->codec->codec_id = av_codec_get_id((const AVCodecTag * const []) {
367 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
368 st->codec->codec_id = av_codec_get_id((const AVCodecTag * const []) {
376 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
377 st->codec->codec_id = ff_codec_get_id(ff_nut_subtitle_tags, tmp);
380 st->codec->codec_type = AVMEDIA_TYPE_DATA;
381 st->codec->codec_id = ff_codec_get_id(ff_nut_data_tags, tmp);
384 av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class);
385 return AVERROR(ENOSYS);
387 if (class < 3 && st->codec->codec_id == AV_CODEC_ID_NONE)
388 av_log(s, AV_LOG_ERROR,
389 "Unknown codec tag '0x%04x' for stream number %d\n",
390 (unsigned int) tmp, stream_id);
392 GET_V(stc->time_base_id, tmp < nut->time_base_count);
393 GET_V(stc->msb_pts_shift, tmp < 16);
394 stc->max_pts_distance = ffio_read_varlen(bc);
395 GET_V(stc->decode_delay, tmp < 1000); // sanity limit, raise this if Moore's law is true
396 st->codec->has_b_frames = stc->decode_delay;
397 ffio_read_varlen(bc); // stream flags
399 GET_V(st->codec->extradata_size, tmp < (1 << 30));
400 if (st->codec->extradata_size) {
401 st->codec->extradata = av_mallocz(st->codec->extradata_size +
402 FF_INPUT_BUFFER_PADDING_SIZE);
403 avio_read(bc, st->codec->extradata, st->codec->extradata_size);
406 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
407 GET_V(st->codec->width, tmp > 0);
408 GET_V(st->codec->height, tmp > 0);
409 st->sample_aspect_ratio.num = ffio_read_varlen(bc);
410 st->sample_aspect_ratio.den = ffio_read_varlen(bc);
411 if ((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)) {
412 av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n",
413 st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
414 return AVERROR_INVALIDDATA;
416 ffio_read_varlen(bc); /* csp type */
417 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
418 GET_V(st->codec->sample_rate, tmp > 0);
419 ffio_read_varlen(bc); // samplerate_den
420 GET_V(st->codec->channels, tmp > 0);
422 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
423 av_log(s, AV_LOG_ERROR,
424 "stream header %d checksum mismatch\n", stream_id);
425 return AVERROR_INVALIDDATA;
427 stc->time_base = &nut->time_base[stc->time_base_id];
428 avpriv_set_pts_info(s->streams[stream_id], 63, stc->time_base->num,
429 stc->time_base->den);
433 static void set_disposition_bits(AVFormatContext *avf, char *value,
438 for (i = 0; ff_nut_dispositions[i].flag; ++i)
439 if (!strcmp(ff_nut_dispositions[i].str, value))
440 flag = ff_nut_dispositions[i].flag;
442 av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value);
443 for (i = 0; i < avf->nb_streams; ++i)
444 if (stream_id == i || stream_id == -1)
445 avf->streams[i]->disposition |= flag;
448 static int decode_info_header(NUTContext *nut)
450 AVFormatContext *s = nut->avf;
451 AVIOContext *bc = s->pb;
452 uint64_t tmp, chapter_start, chapter_len;
453 unsigned int stream_id_plus1, count;
456 char name[256], str_value[1024], type_str[256];
458 AVChapter *chapter = NULL;
460 AVDictionary **metadata = NULL;
462 end = get_packetheader(nut, bc, 1, INFO_STARTCODE);
463 end += avio_tell(bc);
465 GET_V(stream_id_plus1, tmp <= s->nb_streams);
466 chapter_id = get_s(bc);
467 chapter_start = ffio_read_varlen(bc);
468 chapter_len = ffio_read_varlen(bc);
469 count = ffio_read_varlen(bc);
471 if (chapter_id && !stream_id_plus1) {
472 int64_t start = chapter_start / nut->time_base_count;
473 chapter = avpriv_new_chapter(s, chapter_id,
474 nut->time_base[chapter_start %
475 nut->time_base_count],
476 start, start + chapter_len, NULL);
477 metadata = &chapter->metadata;
478 } else if (stream_id_plus1) {
479 st = s->streams[stream_id_plus1 - 1];
480 metadata = &st->metadata;
482 metadata = &s->metadata;
484 for (i = 0; i < count; i++) {
485 get_str(bc, name, sizeof(name));
489 get_str(bc, str_value, sizeof(str_value));
490 } else if (value == -2) {
491 get_str(bc, type_str, sizeof(type_str));
493 get_str(bc, str_value, sizeof(str_value));
494 } else if (value == -3) {
497 } else if (value == -4) {
499 value = ffio_read_varlen(bc);
500 } else if (value < -4) {
507 if (stream_id_plus1 > s->nb_streams) {
508 av_log(s, AV_LOG_ERROR, "invalid stream id for info packet\n");
512 if (!strcmp(type, "UTF-8")) {
513 if (chapter_id == 0 && !strcmp(name, "Disposition")) {
514 set_disposition_bits(s, str_value, stream_id_plus1 - 1);
517 if (metadata && av_strcasecmp(name, "Uses") &&
518 av_strcasecmp(name, "Depends") && av_strcasecmp(name, "Replaces"))
519 av_dict_set(metadata, name, str_value, 0);
523 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
524 av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n");
525 return AVERROR_INVALIDDATA;
530 static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr)
532 AVFormatContext *s = nut->avf;
533 AVIOContext *bc = s->pb;
536 nut->last_syncpoint_pos = avio_tell(bc) - 8;
538 end = get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);
539 end += avio_tell(bc);
541 tmp = ffio_read_varlen(bc);
542 *back_ptr = nut->last_syncpoint_pos - 16 * ffio_read_varlen(bc);
546 ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count],
547 tmp / nut->time_base_count);
549 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
550 av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n");
551 return AVERROR_INVALIDDATA;
554 *ts = tmp / s->nb_streams *
555 av_q2d(nut->time_base[tmp % s->nb_streams]) * AV_TIME_BASE;
556 ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts);
561 static int find_and_decode_index(NUTContext *nut)
563 AVFormatContext *s = nut->avf;
564 AVIOContext *bc = s->pb;
566 int i, j, syncpoint_count;
567 int64_t filesize = avio_size(bc);
569 int8_t *has_keyframe;
570 int ret = AVERROR_INVALIDDATA;
572 avio_seek(bc, filesize - 12, SEEK_SET);
573 avio_seek(bc, filesize - avio_rb64(bc), SEEK_SET);
574 if (avio_rb64(bc) != INDEX_STARTCODE) {
575 av_log(s, AV_LOG_ERROR, "no index at the end\n");
579 end = get_packetheader(nut, bc, 1, INDEX_STARTCODE);
580 end += avio_tell(bc);
582 ffio_read_varlen(bc); // max_pts
583 GET_V(syncpoint_count, tmp < INT_MAX / 8 && tmp > 0);
584 syncpoints = av_malloc(sizeof(int64_t) * syncpoint_count);
585 has_keyframe = av_malloc(sizeof(int8_t) * (syncpoint_count + 1));
586 for (i = 0; i < syncpoint_count; i++) {
587 syncpoints[i] = ffio_read_varlen(bc);
588 if (syncpoints[i] <= 0)
591 syncpoints[i] += syncpoints[i - 1];
594 for (i = 0; i < s->nb_streams; i++) {
595 int64_t last_pts = -1;
596 for (j = 0; j < syncpoint_count;) {
597 uint64_t x = ffio_read_varlen(bc);
604 if (n + x >= syncpoint_count + 1) {
605 av_log(s, AV_LOG_ERROR, "index overflow A\n");
609 has_keyframe[n++] = flag;
610 has_keyframe[n++] = !flag;
613 if (n >= syncpoint_count + 1) {
614 av_log(s, AV_LOG_ERROR, "index overflow B\n");
617 has_keyframe[n++] = x & 1;
621 if (has_keyframe[0]) {
622 av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n");
625 assert(n <= syncpoint_count + 1);
626 for (; j < n && j < syncpoint_count; j++) {
627 if (has_keyframe[j]) {
628 uint64_t B, A = ffio_read_varlen(bc);
630 A = ffio_read_varlen(bc);
631 B = ffio_read_varlen(bc);
632 // eor_pts[j][i] = last_pts + A + B
635 av_add_index_entry(s->streams[i], 16 * syncpoints[j - 1],
636 last_pts + A, 0, 0, AVINDEX_KEYFRAME);
643 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
644 av_log(s, AV_LOG_ERROR, "index checksum mismatch\n");
651 av_free(has_keyframe);
655 static int nut_read_header(AVFormatContext *s)
657 NUTContext *nut = s->priv_data;
658 AVIOContext *bc = s->pb;
660 int initialized_stream_count;
667 pos = find_startcode(bc, MAIN_STARTCODE, pos) + 1;
669 av_log(s, AV_LOG_ERROR, "No main startcode found.\n");
670 return AVERROR_INVALIDDATA;
672 } while (decode_main_header(nut) < 0);
676 for (initialized_stream_count = 0; initialized_stream_count < s->nb_streams;) {
677 pos = find_startcode(bc, STREAM_STARTCODE, pos) + 1;
679 av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n");
680 return AVERROR_INVALIDDATA;
682 if (decode_stream_header(nut) >= 0)
683 initialized_stream_count++;
689 uint64_t startcode = find_any_startcode(bc, pos);
692 if (startcode == 0) {
693 av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
694 return AVERROR_INVALIDDATA;
695 } else if (startcode == SYNCPOINT_STARTCODE) {
696 nut->next_startcode = startcode;
698 } else if (startcode != INFO_STARTCODE) {
702 decode_info_header(nut);
705 s->data_offset = pos - 8;
708 int64_t orig_pos = avio_tell(bc);
709 find_and_decode_index(nut);
710 avio_seek(bc, orig_pos, SEEK_SET);
712 assert(nut->next_startcode == SYNCPOINT_STARTCODE);
714 ff_metadata_conv_ctx(s, NULL, ff_nut_metadata_conv);
719 static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id,
720 uint8_t *header_idx, int frame_code)
722 AVFormatContext *s = nut->avf;
723 AVIOContext *bc = s->pb;
725 int size, flags, size_mul, pts_delta, i, reserved_count;
728 if (avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance) {
729 av_log(s, AV_LOG_ERROR,
730 "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n",
731 avio_tell(bc), nut->last_syncpoint_pos, nut->max_distance);
732 return AVERROR_INVALIDDATA;
735 flags = nut->frame_code[frame_code].flags;
736 size_mul = nut->frame_code[frame_code].size_mul;
737 size = nut->frame_code[frame_code].size_lsb;
738 *stream_id = nut->frame_code[frame_code].stream_id;
739 pts_delta = nut->frame_code[frame_code].pts_delta;
740 reserved_count = nut->frame_code[frame_code].reserved_count;
741 *header_idx = nut->frame_code[frame_code].header_idx;
743 if (flags & FLAG_INVALID)
744 return AVERROR_INVALIDDATA;
745 if (flags & FLAG_CODED)
746 flags ^= ffio_read_varlen(bc);
747 if (flags & FLAG_STREAM_ID) {
748 GET_V(*stream_id, tmp < s->nb_streams);
750 stc = &nut->stream[*stream_id];
751 if (flags & FLAG_CODED_PTS) {
752 int coded_pts = ffio_read_varlen(bc);
753 // FIXME check last_pts validity?
754 if (coded_pts < (1 << stc->msb_pts_shift)) {
755 *pts = ff_lsb2full(stc, coded_pts);
757 *pts = coded_pts - (1 << stc->msb_pts_shift);
759 *pts = stc->last_pts + pts_delta;
760 if (flags & FLAG_SIZE_MSB)
761 size += size_mul * ffio_read_varlen(bc);
762 if (flags & FLAG_MATCH_TIME)
764 if (flags & FLAG_HEADER_IDX)
765 *header_idx = ffio_read_varlen(bc);
766 if (flags & FLAG_RESERVED)
767 reserved_count = ffio_read_varlen(bc);
768 for (i = 0; i < reserved_count; i++)
769 ffio_read_varlen(bc);
771 if (*header_idx >= (unsigned)nut->header_count) {
772 av_log(s, AV_LOG_ERROR, "header_idx invalid\n");
773 return AVERROR_INVALIDDATA;
777 size -= nut->header_len[*header_idx];
779 if (flags & FLAG_CHECKSUM) {
780 avio_rb32(bc); // FIXME check this
781 } else if (size > 2 * nut->max_distance || FFABS(stc->last_pts - *pts) >
782 stc->max_pts_distance) {
783 av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n");
784 return AVERROR_INVALIDDATA;
787 stc->last_pts = *pts;
788 stc->last_flags = flags;
793 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code)
795 AVFormatContext *s = nut->avf;
796 AVIOContext *bc = s->pb;
797 int size, stream_id, discard;
798 int64_t pts, last_IP_pts;
802 size = decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code);
806 stc = &nut->stream[stream_id];
808 if (stc->last_flags & FLAG_KEY)
809 stc->skip_until_key_frame = 0;
811 discard = s->streams[stream_id]->discard;
812 last_IP_pts = s->streams[stream_id]->last_IP_pts;
813 if ((discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY)) ||
814 (discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE &&
815 last_IP_pts > pts) ||
816 discard >= AVDISCARD_ALL ||
817 stc->skip_until_key_frame) {
822 av_new_packet(pkt, size + nut->header_len[header_idx]);
823 memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]);
824 pkt->pos = avio_tell(bc); // FIXME
825 avio_read(bc, pkt->data + nut->header_len[header_idx], size);
827 pkt->stream_index = stream_id;
828 if (stc->last_flags & FLAG_KEY)
829 pkt->flags |= AV_PKT_FLAG_KEY;
835 static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
837 NUTContext *nut = s->priv_data;
838 AVIOContext *bc = s->pb;
839 int i, frame_code = 0, ret, skip;
840 int64_t ts, back_ptr;
843 int64_t pos = avio_tell(bc);
844 uint64_t tmp = nut->next_startcode;
845 nut->next_startcode = 0;
850 frame_code = avio_r8(bc);
853 if (frame_code == 'N') {
855 for (i = 1; i < 8; i++)
856 tmp = (tmp << 8) + avio_r8(bc);
861 case STREAM_STARTCODE:
862 case INDEX_STARTCODE:
863 skip = get_packetheader(nut, bc, 0, tmp);
867 if (decode_info_header(nut) < 0)
870 case SYNCPOINT_STARTCODE:
871 if (decode_syncpoint(nut, &ts, &back_ptr) < 0)
873 frame_code = avio_r8(bc);
875 ret = decode_frame(nut, pkt, frame_code);
878 else if (ret == 1) // OK but discard packet
882 av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos);
883 tmp = find_any_startcode(bc, nut->last_syncpoint_pos + 1);
885 return AVERROR_INVALIDDATA;
886 av_log(s, AV_LOG_DEBUG, "sync\n");
887 nut->next_startcode = tmp;
892 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,
893 int64_t *pos_arg, int64_t pos_limit)
895 NUTContext *nut = s->priv_data;
896 AVIOContext *bc = s->pb;
897 int64_t pos, pts, back_ptr;
898 av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n",
899 stream_index, *pos_arg, pos_limit);
903 pos = find_startcode(bc, SYNCPOINT_STARTCODE, pos) + 1;
905 assert(nut->next_startcode == 0);
906 av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n");
907 return AV_NOPTS_VALUE;
909 } while (decode_syncpoint(nut, &pts, &back_ptr) < 0);
911 assert(nut->last_syncpoint_pos == *pos_arg);
913 av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts, back_ptr);
914 if (stream_index == -1)
916 else if (stream_index == -2)
919 return AV_NOPTS_VALUE;
922 static int read_seek(AVFormatContext *s, int stream_index,
923 int64_t pts, int flags)
925 NUTContext *nut = s->priv_data;
926 AVStream *st = s->streams[stream_index];
927 Syncpoint dummy = { .ts = pts * av_q2d(st->time_base) * AV_TIME_BASE };
928 Syncpoint nopts_sp = { .ts = AV_NOPTS_VALUE, .back_ptr = AV_NOPTS_VALUE };
929 Syncpoint *sp, *next_node[2] = { &nopts_sp, &nopts_sp };
930 int64_t pos, pos2, ts;
933 if (st->index_entries) {
934 int index = av_index_search_timestamp(st, pts, flags);
938 pos2 = st->index_entries[index].pos;
939 ts = st->index_entries[index].timestamp;
941 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pts_cmp,
942 (void **) next_node);
943 av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n",
944 next_node[0]->pos, next_node[1]->pos, next_node[0]->ts,
946 pos = ff_gen_search(s, -1, dummy.ts, next_node[0]->pos,
947 next_node[1]->pos, next_node[1]->pos,
948 next_node[0]->ts, next_node[1]->ts,
949 AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp);
951 if (!(flags & AVSEEK_FLAG_BACKWARD)) {
952 dummy.pos = pos + 16;
953 next_node[1] = &nopts_sp;
954 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
955 (void **) next_node);
956 pos2 = ff_gen_search(s, -2, dummy.pos, next_node[0]->pos,
957 next_node[1]->pos, next_node[1]->pos,
958 next_node[0]->back_ptr, next_node[1]->back_ptr,
959 flags, &ts, nut_read_timestamp);
962 // FIXME dir but I think it does not matter
965 sp = av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
969 pos2 = sp->back_ptr - 15;
971 av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2);
972 pos = find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2);
973 avio_seek(s->pb, pos, SEEK_SET);
974 av_log(NULL, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos);
975 if (pos2 > pos || pos2 + 15 < pos)
976 av_log(NULL, AV_LOG_ERROR, "no syncpoint at backptr pos\n");
977 for (i = 0; i < s->nb_streams; i++)
978 nut->stream[i].skip_until_key_frame = 1;
983 static int nut_read_close(AVFormatContext *s)
985 NUTContext *nut = s->priv_data;
988 av_freep(&nut->time_base);
989 av_freep(&nut->stream);
991 for (i = 1; i < nut->header_count; i++)
992 av_freep(&nut->header[i]);
997 AVInputFormat ff_nut_demuxer = {
999 .long_name = NULL_IF_CONFIG_SMALL("NUT"),
1000 .priv_data_size = sizeof(NUTContext),
1001 .read_probe = nut_probe,
1002 .read_header = nut_read_header,
1003 .read_packet = nut_read_packet,
1004 .read_close = nut_read_close,
1005 .read_seek = read_seek,
1006 .extensions = "nut",
1007 .codec_tag = ff_nut_codec_tags,