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/mathematics.h"
28 #include "libavutil/tree.h"
29 #include "avio_internal.h"
32 #define NUT_MAX_STREAMS 256 /* arbitrary sanity check value */
34 static int get_str(AVIOContext *bc, char *string, unsigned int maxlen)
36 unsigned int len = ffio_read_varlen(bc);
39 avio_read(bc, string, FFMIN(len, maxlen));
40 while (len > maxlen) {
46 string[FFMIN(len, maxlen - 1)] = 0;
54 static int64_t get_s(AVIOContext *bc)
56 int64_t v = ffio_read_varlen(bc) + 1;
64 static uint64_t get_fourcc(AVIOContext *bc)
66 unsigned int len = ffio_read_varlen(bc);
77 static inline uint64_t get_v_trace(AVIOContext *bc, char *file,
80 uint64_t v = ffio_read_varlen(bc);
82 av_log(NULL, AV_LOG_DEBUG, "get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n",
83 v, v, file, func, line);
87 static inline int64_t get_s_trace(AVIOContext *bc, char *file,
90 int64_t v = get_s(bc);
92 av_log(NULL, AV_LOG_DEBUG, "get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n",
93 v, v, file, func, line);
97 static inline uint64_t get_vb_trace(AVIOContext *bc, char *file,
100 uint64_t v = get_vb(bc);
102 av_log(NULL, AV_LOG_DEBUG, "get_vb %5"PRId64" / %"PRIX64" in %s %s:%d\n",
103 v, v, file, func, line);
106 #define ffio_read_varlen(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
107 #define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
108 #define get_vb(bc) get_vb_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
111 static int get_packetheader(NUTContext *nut, AVIOContext *bc,
112 int calculate_checksum, uint64_t startcode)
115 // start = avio_tell(bc) - 8;
117 startcode = av_be2ne64(startcode);
118 startcode = ff_crc04C11DB7_update(0, (uint8_t*) &startcode, 8);
120 ffio_init_checksum(bc, ff_crc04C11DB7_update, startcode);
121 size = ffio_read_varlen(bc);
124 if (ffio_get_checksum(bc) && size > 4096)
127 ffio_init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0);
132 static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos)
137 /* Note, this may fail if the stream is not seekable, but that should
138 * not matter, as in this case we simply start where we currently are */
139 avio_seek(bc, pos, SEEK_SET);
140 while (!url_feof(bc)) {
141 state = (state << 8) | avio_r8(bc);
142 if ((state >> 56) != 'N')
146 case STREAM_STARTCODE:
147 case SYNCPOINT_STARTCODE:
149 case INDEX_STARTCODE:
158 * Find the given startcode.
159 * @param code the startcode
160 * @param pos the start position of the search, or -1 if the current position
161 * @return the position of the startcode or -1 if not found
163 static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos)
166 uint64_t startcode = find_any_startcode(bc, pos);
167 if (startcode == code)
168 return avio_tell(bc) - 8;
169 else if (startcode == 0)
175 static int nut_probe(AVProbeData *p)
180 for (i = 0; i < p->buf_size; i++) {
181 code = (code << 8) | p->buf[i];
182 if (code == MAIN_STARTCODE)
183 return AVPROBE_SCORE_MAX;
188 #define GET_V(dst, check) \
189 tmp = ffio_read_varlen(bc); \
191 av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp); \
196 static int skip_reserved(AVIOContext *bc, int64_t pos)
198 pos -= avio_tell(bc);
200 avio_seek(bc, pos, SEEK_CUR);
209 static int decode_main_header(NUTContext *nut)
211 AVFormatContext *s = nut->avf;
212 AVIOContext *bc = s->pb;
214 unsigned int stream_count;
216 int tmp_stream, tmp_mul, tmp_pts, tmp_size, tmp_res, tmp_head_idx;
218 end = get_packetheader(nut, bc, 1, MAIN_STARTCODE);
219 end += avio_tell(bc);
221 GET_V(tmp, tmp >= 2 && tmp <= 3)
222 GET_V(stream_count, tmp > 0 && tmp <= NUT_MAX_STREAMS)
224 nut->max_distance = ffio_read_varlen(bc);
225 if (nut->max_distance > 65536) {
226 av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance);
227 nut->max_distance = 65536;
230 GET_V(nut->time_base_count, tmp > 0 && tmp < INT_MAX / sizeof(AVRational))
231 nut->time_base = av_malloc(nut->time_base_count * sizeof(AVRational));
233 for (i = 0; i < nut->time_base_count; i++) {
234 GET_V(nut->time_base[i].num, tmp > 0 && tmp < (1ULL << 31))
235 GET_V(nut->time_base[i].den, tmp > 0 && tmp < (1ULL << 31))
236 if (av_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1) {
237 av_log(s, AV_LOG_ERROR, "time base invalid\n");
238 return AVERROR_INVALIDDATA;
245 for (i = 0; i < 256;) {
246 int tmp_flags = ffio_read_varlen(bc);
247 int tmp_fields = ffio_read_varlen(bc);
252 tmp_mul = ffio_read_varlen(bc);
254 tmp_stream = ffio_read_varlen(bc);
256 tmp_size = ffio_read_varlen(bc);
260 tmp_res = ffio_read_varlen(bc);
264 count = ffio_read_varlen(bc);
266 count = tmp_mul - tmp_size;
270 tmp_head_idx = ffio_read_varlen(bc);
272 while (tmp_fields-- > 8)
273 ffio_read_varlen(bc);
275 if (count == 0 || i + count > 256) {
276 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
277 return AVERROR_INVALIDDATA;
279 if (tmp_stream >= stream_count) {
280 av_log(s, AV_LOG_ERROR, "illegal stream number\n");
281 return AVERROR_INVALIDDATA;
284 for (j = 0; j < count; j++, i++) {
286 nut->frame_code[i].flags = FLAG_INVALID;
290 nut->frame_code[i].flags = tmp_flags;
291 nut->frame_code[i].pts_delta = tmp_pts;
292 nut->frame_code[i].stream_id = tmp_stream;
293 nut->frame_code[i].size_mul = tmp_mul;
294 nut->frame_code[i].size_lsb = tmp_size + j;
295 nut->frame_code[i].reserved_count = tmp_res;
296 nut->frame_code[i].header_idx = tmp_head_idx;
299 av_assert0(nut->frame_code['N'].flags == FLAG_INVALID);
301 if (end > avio_tell(bc) + 4) {
303 GET_V(nut->header_count, tmp < 128U)
305 for (i = 1; i < nut->header_count; i++) {
307 GET_V(nut->header_len[i], tmp > 0 && tmp < 256);
308 rem -= nut->header_len[i];
310 av_log(s, AV_LOG_ERROR, "invalid elision header\n");
311 return AVERROR_INVALIDDATA;
313 hdr = av_malloc(nut->header_len[i]);
315 return AVERROR(ENOMEM);
316 avio_read(bc, hdr, nut->header_len[i]);
317 nut->header[i] = hdr;
319 av_assert0(nut->header_len[0] == 0);
322 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
323 av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n");
324 return AVERROR_INVALIDDATA;
327 nut->stream = av_mallocz(sizeof(StreamContext) * stream_count);
328 for (i = 0; i < stream_count; i++)
329 avformat_new_stream(s, NULL);
334 static int decode_stream_header(NUTContext *nut)
336 AVFormatContext *s = nut->avf;
337 AVIOContext *bc = s->pb;
339 int class, stream_id;
343 end = get_packetheader(nut, bc, 1, STREAM_STARTCODE);
344 end += avio_tell(bc);
346 GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base);
347 stc = &nut->stream[stream_id];
348 st = s->streams[stream_id];
350 return AVERROR(ENOMEM);
352 class = ffio_read_varlen(bc);
353 tmp = get_fourcc(bc);
354 st->codec->codec_tag = tmp;
357 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
358 st->codec->codec_id = av_codec_get_id((const AVCodecTag * const []) {
366 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
367 st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, tmp);
370 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
371 st->codec->codec_id = ff_codec_get_id(ff_nut_subtitle_tags, tmp);
374 st->codec->codec_type = AVMEDIA_TYPE_DATA;
377 av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class);
380 if (class < 3 && st->codec->codec_id == CODEC_ID_NONE)
381 av_log(s, AV_LOG_ERROR,
382 "Unknown codec tag '0x%04x' for stream number %d\n",
383 (unsigned int) tmp, stream_id);
385 GET_V(stc->time_base_id, tmp < nut->time_base_count);
386 GET_V(stc->msb_pts_shift, tmp < 16);
387 stc->max_pts_distance = ffio_read_varlen(bc);
388 GET_V(stc->decode_delay, tmp < 1000); // sanity limit, raise this if Moore's law is true
389 st->codec->has_b_frames = stc->decode_delay;
390 ffio_read_varlen(bc); // stream flags
392 GET_V(st->codec->extradata_size, tmp < (1 << 30));
393 if (st->codec->extradata_size) {
394 st->codec->extradata = av_mallocz(st->codec->extradata_size +
395 FF_INPUT_BUFFER_PADDING_SIZE);
396 avio_read(bc, st->codec->extradata, st->codec->extradata_size);
399 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
400 GET_V(st->codec->width, tmp > 0)
401 GET_V(st->codec->height, tmp > 0)
402 st->sample_aspect_ratio.num = ffio_read_varlen(bc);
403 st->sample_aspect_ratio.den = ffio_read_varlen(bc);
404 if ((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)) {
405 av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n",
406 st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
409 ffio_read_varlen(bc); /* csp type */
410 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
411 GET_V(st->codec->sample_rate, tmp > 0)
412 ffio_read_varlen(bc); // samplerate_den
413 GET_V(st->codec->channels, tmp > 0)
415 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
416 av_log(s, AV_LOG_ERROR,
417 "stream header %d checksum mismatch\n", stream_id);
420 stc->time_base = &nut->time_base[stc->time_base_id];
421 avpriv_set_pts_info(s->streams[stream_id], 63, stc->time_base->num,
422 stc->time_base->den);
426 static void set_disposition_bits(AVFormatContext *avf, char *value,
431 for (i = 0; ff_nut_dispositions[i].flag; ++i)
432 if (!strcmp(ff_nut_dispositions[i].str, value))
433 flag = ff_nut_dispositions[i].flag;
435 av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value);
436 for (i = 0; i < avf->nb_streams; ++i)
437 if (stream_id == i || stream_id == -1)
438 avf->streams[i]->disposition |= flag;
441 static int decode_info_header(NUTContext *nut)
443 AVFormatContext *s = nut->avf;
444 AVIOContext *bc = s->pb;
445 uint64_t tmp, chapter_start, chapter_len;
446 unsigned int stream_id_plus1, count;
449 char name[256], str_value[1024], type_str[256];
451 AVChapter *chapter = NULL;
453 AVDictionary **metadata = NULL;
455 end = get_packetheader(nut, bc, 1, INFO_STARTCODE);
456 end += avio_tell(bc);
458 GET_V(stream_id_plus1, tmp <= s->nb_streams)
459 chapter_id = get_s(bc);
460 chapter_start = ffio_read_varlen(bc);
461 chapter_len = ffio_read_varlen(bc);
462 count = ffio_read_varlen(bc);
464 if (chapter_id && !stream_id_plus1) {
465 int64_t start = chapter_start / nut->time_base_count;
466 chapter = avpriv_new_chapter(s, chapter_id,
467 nut->time_base[chapter_start %
468 nut->time_base_count],
469 start, start + chapter_len, NULL);
470 metadata = &chapter->metadata;
471 } else if (stream_id_plus1) {
472 st = s->streams[stream_id_plus1 - 1];
473 metadata = &st->metadata;
475 metadata = &s->metadata;
477 for (i = 0; i < count; i++) {
478 get_str(bc, name, sizeof(name));
482 get_str(bc, str_value, sizeof(str_value));
483 } else if (value == -2) {
484 get_str(bc, type_str, sizeof(type_str));
486 get_str(bc, str_value, sizeof(str_value));
487 } else if (value == -3) {
490 } else if (value == -4) {
492 value = ffio_read_varlen(bc);
493 } else if (value < -4) {
500 if (stream_id_plus1 > s->nb_streams) {
501 av_log(s, AV_LOG_ERROR, "invalid stream id for info packet\n");
505 if (!strcmp(type, "UTF-8")) {
506 if (chapter_id == 0 && !strcmp(name, "Disposition")) {
507 set_disposition_bits(s, str_value, stream_id_plus1 - 1);
510 if (metadata && av_strcasecmp(name, "Uses") &&
511 av_strcasecmp(name, "Depends") && av_strcasecmp(name, "Replaces"))
512 av_dict_set(metadata, name, str_value, 0);
516 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
517 av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n");
523 static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr)
525 AVFormatContext *s = nut->avf;
526 AVIOContext *bc = s->pb;
529 nut->last_syncpoint_pos = avio_tell(bc) - 8;
531 end = get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);
532 end += avio_tell(bc);
534 tmp = ffio_read_varlen(bc);
535 *back_ptr = nut->last_syncpoint_pos - 16 * ffio_read_varlen(bc);
539 ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count],
540 tmp / nut->time_base_count);
542 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
543 av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n");
547 *ts = tmp / s->nb_streams *
548 av_q2d(nut->time_base[tmp % s->nb_streams]) * AV_TIME_BASE;
549 ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts);
554 static int find_and_decode_index(NUTContext *nut)
556 AVFormatContext *s = nut->avf;
557 AVIOContext *bc = s->pb;
559 int i, j, syncpoint_count;
560 int64_t filesize = avio_size(bc);
562 int8_t *has_keyframe;
565 avio_seek(bc, filesize - 12, SEEK_SET);
566 avio_seek(bc, filesize - avio_rb64(bc), SEEK_SET);
567 if (avio_rb64(bc) != INDEX_STARTCODE) {
568 av_log(s, AV_LOG_ERROR, "no index at the end\n");
572 end = get_packetheader(nut, bc, 1, INDEX_STARTCODE);
573 end += avio_tell(bc);
575 ffio_read_varlen(bc); // max_pts
576 GET_V(syncpoint_count, tmp < INT_MAX / 8 && tmp > 0)
577 syncpoints = av_malloc(sizeof(int64_t) * syncpoint_count);
578 has_keyframe = av_malloc(sizeof(int8_t) * (syncpoint_count + 1));
579 for (i = 0; i < syncpoint_count; i++) {
580 syncpoints[i] = ffio_read_varlen(bc);
581 if (syncpoints[i] <= 0)
584 syncpoints[i] += syncpoints[i - 1];
587 for (i = 0; i < s->nb_streams; i++) {
588 int64_t last_pts = -1;
589 for (j = 0; j < syncpoint_count;) {
590 uint64_t x = ffio_read_varlen(bc);
597 if (n + x >= syncpoint_count + 1) {
598 av_log(s, AV_LOG_ERROR, "index overflow A\n");
602 has_keyframe[n++] = flag;
603 has_keyframe[n++] = !flag;
606 if (n >= syncpoint_count + 1) {
607 av_log(s, AV_LOG_ERROR, "index overflow B\n");
610 has_keyframe[n++] = x & 1;
614 if (has_keyframe[0]) {
615 av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n");
618 av_assert0(n <= syncpoint_count + 1);
619 for (; j < n && j < syncpoint_count; j++) {
620 if (has_keyframe[j]) {
621 uint64_t B, A = ffio_read_varlen(bc);
623 A = ffio_read_varlen(bc);
624 B = ffio_read_varlen(bc);
625 // eor_pts[j][i] = last_pts + A + B
628 av_add_index_entry(s->streams[i], 16 * syncpoints[j - 1],
629 last_pts + A, 0, 0, AVINDEX_KEYFRAME);
636 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
637 av_log(s, AV_LOG_ERROR, "index checksum mismatch\n");
644 av_free(has_keyframe);
648 static int nut_read_header(AVFormatContext *s)
650 NUTContext *nut = s->priv_data;
651 AVIOContext *bc = s->pb;
653 int initialized_stream_count;
660 pos = find_startcode(bc, MAIN_STARTCODE, pos) + 1;
662 av_log(s, AV_LOG_ERROR, "No main startcode found.\n");
663 return AVERROR_INVALIDDATA;
665 } while (decode_main_header(nut) < 0);
669 for (initialized_stream_count = 0; initialized_stream_count < s->nb_streams;) {
670 pos = find_startcode(bc, STREAM_STARTCODE, pos) + 1;
672 av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n");
673 return AVERROR_INVALIDDATA;
675 if (decode_stream_header(nut) >= 0)
676 initialized_stream_count++;
682 uint64_t startcode = find_any_startcode(bc, pos);
685 if (startcode == 0) {
686 av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
687 return AVERROR_INVALIDDATA;
688 } else if (startcode == SYNCPOINT_STARTCODE) {
689 nut->next_startcode = startcode;
691 } else if (startcode != INFO_STARTCODE) {
695 decode_info_header(nut);
698 s->data_offset = pos - 8;
701 int64_t orig_pos = avio_tell(bc);
702 find_and_decode_index(nut);
703 avio_seek(bc, orig_pos, SEEK_SET);
705 av_assert0(nut->next_startcode == SYNCPOINT_STARTCODE);
707 ff_metadata_conv_ctx(s, NULL, ff_nut_metadata_conv);
712 static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id,
713 uint8_t *header_idx, int frame_code)
715 AVFormatContext *s = nut->avf;
716 AVIOContext *bc = s->pb;
718 int size, flags, size_mul, pts_delta, i, reserved_count;
721 if (avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance) {
722 av_log(s, AV_LOG_ERROR,
723 "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n",
724 avio_tell(bc), nut->last_syncpoint_pos, nut->max_distance);
725 return AVERROR_INVALIDDATA;
728 flags = nut->frame_code[frame_code].flags;
729 size_mul = nut->frame_code[frame_code].size_mul;
730 size = nut->frame_code[frame_code].size_lsb;
731 *stream_id = nut->frame_code[frame_code].stream_id;
732 pts_delta = nut->frame_code[frame_code].pts_delta;
733 reserved_count = nut->frame_code[frame_code].reserved_count;
734 *header_idx = nut->frame_code[frame_code].header_idx;
736 if (flags & FLAG_INVALID)
737 return AVERROR_INVALIDDATA;
738 if (flags & FLAG_CODED)
739 flags ^= ffio_read_varlen(bc);
740 if (flags & FLAG_STREAM_ID) {
741 GET_V(*stream_id, tmp < s->nb_streams)
743 stc = &nut->stream[*stream_id];
744 if (flags & FLAG_CODED_PTS) {
745 int coded_pts = ffio_read_varlen(bc);
746 // FIXME check last_pts validity?
747 if (coded_pts < (1 << stc->msb_pts_shift)) {
748 *pts = ff_lsb2full(stc, coded_pts);
750 *pts = coded_pts - (1 << stc->msb_pts_shift);
752 *pts = stc->last_pts + pts_delta;
753 if (flags & FLAG_SIZE_MSB)
754 size += size_mul * ffio_read_varlen(bc);
755 if (flags & FLAG_MATCH_TIME)
757 if (flags & FLAG_HEADER_IDX)
758 *header_idx = ffio_read_varlen(bc);
759 if (flags & FLAG_RESERVED)
760 reserved_count = ffio_read_varlen(bc);
761 for (i = 0; i < reserved_count; i++)
762 ffio_read_varlen(bc);
764 if (*header_idx >= (unsigned)nut->header_count) {
765 av_log(s, AV_LOG_ERROR, "header_idx invalid\n");
766 return AVERROR_INVALIDDATA;
770 size -= nut->header_len[*header_idx];
772 if (flags & FLAG_CHECKSUM) {
773 avio_rb32(bc); // FIXME check this
774 } else if (size > 2 * nut->max_distance || FFABS(stc->last_pts - *pts) >
775 stc->max_pts_distance) {
776 av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n");
777 return AVERROR_INVALIDDATA;
780 stc->last_pts = *pts;
781 stc->last_flags = flags;
786 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code)
788 AVFormatContext *s = nut->avf;
789 AVIOContext *bc = s->pb;
790 int size, stream_id, discard;
791 int64_t pts, last_IP_pts;
795 size = decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code);
799 stc = &nut->stream[stream_id];
801 if (stc->last_flags & FLAG_KEY)
802 stc->skip_until_key_frame = 0;
804 discard = s->streams[stream_id]->discard;
805 last_IP_pts = s->streams[stream_id]->last_IP_pts;
806 if ((discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY)) ||
807 (discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE &&
808 last_IP_pts > pts) ||
809 discard >= AVDISCARD_ALL ||
810 stc->skip_until_key_frame) {
815 av_new_packet(pkt, size + nut->header_len[header_idx]);
816 memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]);
817 pkt->pos = avio_tell(bc); // FIXME
818 avio_read(bc, pkt->data + nut->header_len[header_idx], size);
820 pkt->stream_index = stream_id;
821 if (stc->last_flags & FLAG_KEY)
822 pkt->flags |= AV_PKT_FLAG_KEY;
828 static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
830 NUTContext *nut = s->priv_data;
831 AVIOContext *bc = s->pb;
832 int i, frame_code = 0, ret, skip;
833 int64_t ts, back_ptr;
836 int64_t pos = avio_tell(bc);
837 uint64_t tmp = nut->next_startcode;
838 nut->next_startcode = 0;
843 frame_code = avio_r8(bc);
846 if (frame_code == 'N') {
848 for (i = 1; i < 8; i++)
849 tmp = (tmp << 8) + avio_r8(bc);
854 case STREAM_STARTCODE:
855 case INDEX_STARTCODE:
856 skip = get_packetheader(nut, bc, 0, tmp);
860 if (decode_info_header(nut) < 0)
863 case SYNCPOINT_STARTCODE:
864 if (decode_syncpoint(nut, &ts, &back_ptr) < 0)
866 frame_code = avio_r8(bc);
868 ret = decode_frame(nut, pkt, frame_code);
871 else if (ret == 1) // OK but discard packet
875 av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos);
876 tmp = find_any_startcode(bc, nut->last_syncpoint_pos + 1);
878 return AVERROR_INVALIDDATA;
879 av_log(s, AV_LOG_DEBUG, "sync\n");
880 nut->next_startcode = tmp;
885 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,
886 int64_t *pos_arg, int64_t pos_limit)
888 NUTContext *nut = s->priv_data;
889 AVIOContext *bc = s->pb;
890 int64_t pos, pts, back_ptr;
891 av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n",
892 stream_index, *pos_arg, pos_limit);
896 pos = find_startcode(bc, SYNCPOINT_STARTCODE, pos) + 1;
898 av_assert0(nut->next_startcode == 0);
899 av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n");
900 return AV_NOPTS_VALUE;
902 } while (decode_syncpoint(nut, &pts, &back_ptr) < 0);
904 av_assert0(nut->last_syncpoint_pos == *pos_arg);
906 av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts, back_ptr);
907 if (stream_index == -2)
909 av_assert0(stream_index == -1);
913 static int read_seek(AVFormatContext *s, int stream_index,
914 int64_t pts, int flags)
916 NUTContext *nut = s->priv_data;
917 AVStream *st = s->streams[stream_index];
918 Syncpoint dummy = { .ts = pts * av_q2d(st->time_base) * AV_TIME_BASE };
919 Syncpoint nopts_sp = { .ts = AV_NOPTS_VALUE, .back_ptr = AV_NOPTS_VALUE };
920 Syncpoint *sp, *next_node[2] = { &nopts_sp, &nopts_sp };
921 int64_t pos, pos2, ts;
924 if (st->index_entries) {
925 int index = av_index_search_timestamp(st, pts, flags);
929 pos2 = st->index_entries[index].pos;
930 ts = st->index_entries[index].timestamp;
932 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pts_cmp,
933 (void **) next_node);
934 av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n",
935 next_node[0]->pos, next_node[1]->pos, next_node[0]->ts,
937 pos = ff_gen_search(s, -1, dummy.ts, next_node[0]->pos,
938 next_node[1]->pos, next_node[1]->pos,
939 next_node[0]->ts, next_node[1]->ts,
940 AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp);
942 if (!(flags & AVSEEK_FLAG_BACKWARD)) {
943 dummy.pos = pos + 16;
944 next_node[1] = &nopts_sp;
945 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
946 (void **) next_node);
947 pos2 = ff_gen_search(s, -2, dummy.pos, next_node[0]->pos,
948 next_node[1]->pos, next_node[1]->pos,
949 next_node[0]->back_ptr, next_node[1]->back_ptr,
950 flags, &ts, nut_read_timestamp);
953 // FIXME dir but I think it does not matter
956 sp = av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
960 pos2 = sp->back_ptr - 15;
962 av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2);
963 pos = find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2);
964 avio_seek(s->pb, pos, SEEK_SET);
965 av_log(NULL, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos);
966 if (pos2 > pos || pos2 + 15 < pos)
967 av_log(NULL, AV_LOG_ERROR, "no syncpoint at backptr pos\n");
968 for (i = 0; i < s->nb_streams; i++)
969 nut->stream[i].skip_until_key_frame = 1;
974 static int nut_read_close(AVFormatContext *s)
976 NUTContext *nut = s->priv_data;
979 av_freep(&nut->time_base);
980 av_freep(&nut->stream);
982 for (i = 1; i < nut->header_count; i++)
983 av_freep(&nut->header[i]);
988 AVInputFormat ff_nut_demuxer = {
990 .long_name = NULL_IF_CONFIG_SMALL("NUT format"),
991 .priv_data_size = sizeof(NUTContext),
992 .read_probe = nut_probe,
993 .read_header = nut_read_header,
994 .read_packet = nut_read_packet,
995 .read_close = nut_read_close,
996 .read_seek = read_seek,
998 .codec_tag = (const AVCodecTag * const []) {
999 ff_codec_bmp_tags, ff_nut_video_tags, ff_codec_wav_tags,
1000 ff_nut_subtitle_tags, 0