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/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, char *file,
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, char *file,
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 static inline uint64_t get_vb_trace(AVIOContext *bc, char *file,
100 char *func, int line)
102 uint64_t v = get_vb(bc);
104 av_log(NULL, AV_LOG_DEBUG, "get_vb %5"PRId64" / %"PRIX64" in %s %s:%d\n",
105 v, v, file, func, line);
108 #define ffio_read_varlen(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
109 #define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
110 #define get_vb(bc) get_vb_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
113 static int get_packetheader(NUTContext *nut, AVIOContext *bc,
114 int calculate_checksum, uint64_t startcode)
117 // start = avio_tell(bc) - 8;
119 startcode = av_be2ne64(startcode);
120 startcode = ff_crc04C11DB7_update(0, (uint8_t*) &startcode, 8);
122 ffio_init_checksum(bc, ff_crc04C11DB7_update, startcode);
123 size = ffio_read_varlen(bc);
126 if (ffio_get_checksum(bc) && size > 4096)
129 ffio_init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0);
134 static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos)
139 /* Note, this may fail if the stream is not seekable, but that should
140 * not matter, as in this case we simply start where we currently are */
141 avio_seek(bc, pos, SEEK_SET);
142 while (!url_feof(bc)) {
143 state = (state << 8) | avio_r8(bc);
144 if ((state >> 56) != 'N')
148 case STREAM_STARTCODE:
149 case SYNCPOINT_STARTCODE:
151 case INDEX_STARTCODE:
160 * Find the given startcode.
161 * @param code the startcode
162 * @param pos the start position of the search, or -1 if the current position
163 * @return the position of the startcode or -1 if not found
165 static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos)
168 uint64_t startcode = find_any_startcode(bc, pos);
169 if (startcode == code)
170 return avio_tell(bc) - 8;
171 else if (startcode == 0)
177 static int nut_probe(AVProbeData *p)
182 for (i = 0; i < p->buf_size; i++) {
183 code = (code << 8) | p->buf[i];
184 if (code == MAIN_STARTCODE)
185 return AVPROBE_SCORE_MAX;
190 #define GET_V(dst, check) \
191 tmp = ffio_read_varlen(bc); \
193 av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp); \
198 static int skip_reserved(AVIOContext *bc, int64_t pos)
200 pos -= avio_tell(bc);
202 avio_seek(bc, pos, SEEK_CUR);
211 static int decode_main_header(NUTContext *nut)
213 AVFormatContext *s = nut->avf;
214 AVIOContext *bc = s->pb;
216 unsigned int stream_count;
218 int tmp_stream, tmp_mul, tmp_pts, tmp_size, tmp_res, tmp_head_idx;
220 end = get_packetheader(nut, bc, 1, MAIN_STARTCODE);
221 end += avio_tell(bc);
223 GET_V(tmp, tmp >= 2 && tmp <= 3)
224 GET_V(stream_count, tmp > 0 && tmp <= NUT_MAX_STREAMS)
226 nut->max_distance = ffio_read_varlen(bc);
227 if (nut->max_distance > 65536) {
228 av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance);
229 nut->max_distance = 65536;
232 GET_V(nut->time_base_count, tmp > 0 && tmp < INT_MAX / sizeof(AVRational))
233 nut->time_base = av_malloc(nut->time_base_count * sizeof(AVRational));
235 for (i = 0; i < nut->time_base_count; i++) {
236 GET_V(nut->time_base[i].num, tmp > 0 && tmp < (1ULL << 31))
237 GET_V(nut->time_base[i].den, tmp > 0 && tmp < (1ULL << 31))
238 if (av_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1) {
239 av_log(s, AV_LOG_ERROR, "time base invalid\n");
240 return AVERROR_INVALIDDATA;
247 for (i = 0; i < 256;) {
248 int tmp_flags = ffio_read_varlen(bc);
249 int tmp_fields = ffio_read_varlen(bc);
254 tmp_mul = ffio_read_varlen(bc);
256 tmp_stream = ffio_read_varlen(bc);
258 tmp_size = ffio_read_varlen(bc);
262 tmp_res = ffio_read_varlen(bc);
266 count = ffio_read_varlen(bc);
268 count = tmp_mul - tmp_size;
272 tmp_head_idx = ffio_read_varlen(bc);
274 while (tmp_fields-- > 8)
275 ffio_read_varlen(bc);
277 if (count == 0 || i + count > 256) {
278 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
279 return AVERROR_INVALIDDATA;
281 if (tmp_stream >= stream_count) {
282 av_log(s, AV_LOG_ERROR, "illegal stream number\n");
283 return AVERROR_INVALIDDATA;
286 for (j = 0; j < count; j++, i++) {
288 nut->frame_code[i].flags = FLAG_INVALID;
292 nut->frame_code[i].flags = tmp_flags;
293 nut->frame_code[i].pts_delta = tmp_pts;
294 nut->frame_code[i].stream_id = tmp_stream;
295 nut->frame_code[i].size_mul = tmp_mul;
296 nut->frame_code[i].size_lsb = tmp_size + j;
297 nut->frame_code[i].reserved_count = tmp_res;
298 nut->frame_code[i].header_idx = tmp_head_idx;
301 assert(nut->frame_code['N'].flags == FLAG_INVALID);
303 if (end > avio_tell(bc) + 4) {
305 GET_V(nut->header_count, tmp < 128U)
307 for (i = 1; i < nut->header_count; i++) {
309 GET_V(nut->header_len[i], tmp > 0 && tmp < 256);
310 rem -= nut->header_len[i];
312 av_log(s, AV_LOG_ERROR, "invalid elision header\n");
313 return AVERROR_INVALIDDATA;
315 hdr = av_malloc(nut->header_len[i]);
317 return AVERROR(ENOMEM);
318 avio_read(bc, hdr, nut->header_len[i]);
319 nut->header[i] = hdr;
321 assert(nut->header_len[0] == 0);
324 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
325 av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n");
326 return AVERROR_INVALIDDATA;
329 nut->stream = av_mallocz(sizeof(StreamContext) * stream_count);
330 for (i = 0; i < stream_count; i++)
331 avformat_new_stream(s, NULL);
336 static int decode_stream_header(NUTContext *nut)
338 AVFormatContext *s = nut->avf;
339 AVIOContext *bc = s->pb;
341 int class, stream_id;
345 end = get_packetheader(nut, bc, 1, STREAM_STARTCODE);
346 end += avio_tell(bc);
348 GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base);
349 stc = &nut->stream[stream_id];
350 st = s->streams[stream_id];
352 return AVERROR(ENOMEM);
354 class = ffio_read_varlen(bc);
355 tmp = get_fourcc(bc);
356 st->codec->codec_tag = tmp;
359 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
360 st->codec->codec_id = av_codec_get_id((const AVCodecTag * const []) {
368 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
369 st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, tmp);
372 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
373 st->codec->codec_id = ff_codec_get_id(ff_nut_subtitle_tags, tmp);
376 st->codec->codec_type = AVMEDIA_TYPE_DATA;
379 av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class);
382 if (class < 3 && st->codec->codec_id == CODEC_ID_NONE)
383 av_log(s, AV_LOG_ERROR,
384 "Unknown codec tag '0x%04x' for stream number %d\n",
385 (unsigned int) tmp, stream_id);
387 GET_V(stc->time_base_id, tmp < nut->time_base_count);
388 GET_V(stc->msb_pts_shift, tmp < 16);
389 stc->max_pts_distance = ffio_read_varlen(bc);
390 GET_V(stc->decode_delay, tmp < 1000); // sanity limit, raise this if Moore's law is true
391 st->codec->has_b_frames = stc->decode_delay;
392 ffio_read_varlen(bc); // stream flags
394 GET_V(st->codec->extradata_size, tmp < (1 << 30));
395 if (st->codec->extradata_size) {
396 st->codec->extradata = av_mallocz(st->codec->extradata_size +
397 FF_INPUT_BUFFER_PADDING_SIZE);
398 avio_read(bc, st->codec->extradata, st->codec->extradata_size);
401 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
402 GET_V(st->codec->width, tmp > 0)
403 GET_V(st->codec->height, tmp > 0)
404 st->sample_aspect_ratio.num = ffio_read_varlen(bc);
405 st->sample_aspect_ratio.den = ffio_read_varlen(bc);
406 if ((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)) {
407 av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n",
408 st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
411 ffio_read_varlen(bc); /* csp type */
412 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
413 GET_V(st->codec->sample_rate, tmp > 0)
414 ffio_read_varlen(bc); // samplerate_den
415 GET_V(st->codec->channels, tmp > 0)
417 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
418 av_log(s, AV_LOG_ERROR,
419 "stream header %d checksum mismatch\n", stream_id);
422 stc->time_base = &nut->time_base[stc->time_base_id];
423 avpriv_set_pts_info(s->streams[stream_id], 63, stc->time_base->num,
424 stc->time_base->den);
428 static void set_disposition_bits(AVFormatContext *avf, char *value,
433 for (i = 0; ff_nut_dispositions[i].flag; ++i)
434 if (!strcmp(ff_nut_dispositions[i].str, value))
435 flag = ff_nut_dispositions[i].flag;
437 av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value);
438 for (i = 0; i < avf->nb_streams; ++i)
439 if (stream_id == i || stream_id == -1)
440 avf->streams[i]->disposition |= flag;
443 static int decode_info_header(NUTContext *nut)
445 AVFormatContext *s = nut->avf;
446 AVIOContext *bc = s->pb;
447 uint64_t tmp, chapter_start, chapter_len;
448 unsigned int stream_id_plus1, count;
451 char name[256], str_value[1024], type_str[256];
453 AVChapter *chapter = NULL;
455 AVDictionary **metadata = NULL;
457 end = get_packetheader(nut, bc, 1, INFO_STARTCODE);
458 end += avio_tell(bc);
460 GET_V(stream_id_plus1, tmp <= s->nb_streams)
461 chapter_id = get_s(bc);
462 chapter_start = ffio_read_varlen(bc);
463 chapter_len = ffio_read_varlen(bc);
464 count = ffio_read_varlen(bc);
466 if (chapter_id && !stream_id_plus1) {
467 int64_t start = chapter_start / nut->time_base_count;
468 chapter = avpriv_new_chapter(s, chapter_id,
469 nut->time_base[chapter_start %
470 nut->time_base_count],
471 start, start + chapter_len, NULL);
472 metadata = &chapter->metadata;
473 } else if (stream_id_plus1) {
474 st = s->streams[stream_id_plus1 - 1];
475 metadata = &st->metadata;
477 metadata = &s->metadata;
479 for (i = 0; i < count; i++) {
480 get_str(bc, name, sizeof(name));
484 get_str(bc, str_value, sizeof(str_value));
485 } else if (value == -2) {
486 get_str(bc, type_str, sizeof(type_str));
488 get_str(bc, str_value, sizeof(str_value));
489 } else if (value == -3) {
492 } else if (value == -4) {
494 value = ffio_read_varlen(bc);
495 } else if (value < -4) {
502 if (stream_id_plus1 > s->nb_streams) {
503 av_log(s, AV_LOG_ERROR, "invalid stream id for info packet\n");
507 if (!strcmp(type, "UTF-8")) {
508 if (chapter_id == 0 && !strcmp(name, "Disposition")) {
509 set_disposition_bits(s, str_value, stream_id_plus1 - 1);
512 if (metadata && av_strcasecmp(name, "Uses") &&
513 av_strcasecmp(name, "Depends") && av_strcasecmp(name, "Replaces"))
514 av_dict_set(metadata, name, str_value, 0);
518 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
519 av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n");
525 static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr)
527 AVFormatContext *s = nut->avf;
528 AVIOContext *bc = s->pb;
531 nut->last_syncpoint_pos = avio_tell(bc) - 8;
533 end = get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);
534 end += avio_tell(bc);
536 tmp = ffio_read_varlen(bc);
537 *back_ptr = nut->last_syncpoint_pos - 16 * ffio_read_varlen(bc);
541 ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count],
542 tmp / nut->time_base_count);
544 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
545 av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n");
549 *ts = tmp / s->nb_streams *
550 av_q2d(nut->time_base[tmp % s->nb_streams]) * AV_TIME_BASE;
551 ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts);
556 static int find_and_decode_index(NUTContext *nut)
558 AVFormatContext *s = nut->avf;
559 AVIOContext *bc = s->pb;
561 int i, j, syncpoint_count;
562 int64_t filesize = avio_size(bc);
564 int8_t *has_keyframe;
567 avio_seek(bc, filesize - 12, SEEK_SET);
568 avio_seek(bc, filesize - avio_rb64(bc), SEEK_SET);
569 if (avio_rb64(bc) != INDEX_STARTCODE) {
570 av_log(s, AV_LOG_ERROR, "no index at the end\n");
574 end = get_packetheader(nut, bc, 1, INDEX_STARTCODE);
575 end += avio_tell(bc);
577 ffio_read_varlen(bc); // max_pts
578 GET_V(syncpoint_count, tmp < INT_MAX / 8 && tmp > 0)
579 syncpoints = av_malloc(sizeof(int64_t) * syncpoint_count);
580 has_keyframe = av_malloc(sizeof(int8_t) * (syncpoint_count + 1));
581 for (i = 0; i < syncpoint_count; i++) {
582 syncpoints[i] = ffio_read_varlen(bc);
583 if (syncpoints[i] <= 0)
586 syncpoints[i] += syncpoints[i - 1];
589 for (i = 0; i < s->nb_streams; i++) {
590 int64_t last_pts = -1;
591 for (j = 0; j < syncpoint_count;) {
592 uint64_t x = ffio_read_varlen(bc);
599 if (n + x >= syncpoint_count + 1) {
600 av_log(s, AV_LOG_ERROR, "index overflow A\n");
604 has_keyframe[n++] = flag;
605 has_keyframe[n++] = !flag;
608 if (n >= syncpoint_count + 1) {
609 av_log(s, AV_LOG_ERROR, "index overflow B\n");
612 has_keyframe[n++] = x & 1;
616 if (has_keyframe[0]) {
617 av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n");
620 assert(n <= syncpoint_count + 1);
621 for (; j < n && j < syncpoint_count; j++) {
622 if (has_keyframe[j]) {
623 uint64_t B, A = ffio_read_varlen(bc);
625 A = ffio_read_varlen(bc);
626 B = ffio_read_varlen(bc);
627 // eor_pts[j][i] = last_pts + A + B
630 av_add_index_entry(s->streams[i], 16 * syncpoints[j - 1],
631 last_pts + A, 0, 0, AVINDEX_KEYFRAME);
638 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
639 av_log(s, AV_LOG_ERROR, "index checksum mismatch\n");
646 av_free(has_keyframe);
650 static int nut_read_header(AVFormatContext *s)
652 NUTContext *nut = s->priv_data;
653 AVIOContext *bc = s->pb;
655 int initialized_stream_count;
662 pos = find_startcode(bc, MAIN_STARTCODE, pos) + 1;
664 av_log(s, AV_LOG_ERROR, "No main startcode found.\n");
665 return AVERROR_INVALIDDATA;
667 } while (decode_main_header(nut) < 0);
671 for (initialized_stream_count = 0; initialized_stream_count < s->nb_streams;) {
672 pos = find_startcode(bc, STREAM_STARTCODE, pos) + 1;
674 av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n");
675 return AVERROR_INVALIDDATA;
677 if (decode_stream_header(nut) >= 0)
678 initialized_stream_count++;
684 uint64_t startcode = find_any_startcode(bc, pos);
687 if (startcode == 0) {
688 av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
689 return AVERROR_INVALIDDATA;
690 } else if (startcode == SYNCPOINT_STARTCODE) {
691 nut->next_startcode = startcode;
693 } else if (startcode != INFO_STARTCODE) {
697 decode_info_header(nut);
700 s->data_offset = pos - 8;
703 int64_t orig_pos = avio_tell(bc);
704 find_and_decode_index(nut);
705 avio_seek(bc, orig_pos, SEEK_SET);
707 assert(nut->next_startcode == SYNCPOINT_STARTCODE);
709 ff_metadata_conv_ctx(s, NULL, ff_nut_metadata_conv);
714 static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id,
715 uint8_t *header_idx, int frame_code)
717 AVFormatContext *s = nut->avf;
718 AVIOContext *bc = s->pb;
720 int size, flags, size_mul, pts_delta, i, reserved_count;
723 if (avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance) {
724 av_log(s, AV_LOG_ERROR,
725 "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n",
726 avio_tell(bc), nut->last_syncpoint_pos, nut->max_distance);
727 return AVERROR_INVALIDDATA;
730 flags = nut->frame_code[frame_code].flags;
731 size_mul = nut->frame_code[frame_code].size_mul;
732 size = nut->frame_code[frame_code].size_lsb;
733 *stream_id = nut->frame_code[frame_code].stream_id;
734 pts_delta = nut->frame_code[frame_code].pts_delta;
735 reserved_count = nut->frame_code[frame_code].reserved_count;
736 *header_idx = nut->frame_code[frame_code].header_idx;
738 if (flags & FLAG_INVALID)
739 return AVERROR_INVALIDDATA;
740 if (flags & FLAG_CODED)
741 flags ^= ffio_read_varlen(bc);
742 if (flags & FLAG_STREAM_ID) {
743 GET_V(*stream_id, tmp < s->nb_streams)
745 stc = &nut->stream[*stream_id];
746 if (flags & FLAG_CODED_PTS) {
747 int coded_pts = ffio_read_varlen(bc);
748 // FIXME check last_pts validity?
749 if (coded_pts < (1 << stc->msb_pts_shift)) {
750 *pts = ff_lsb2full(stc, coded_pts);
752 *pts = coded_pts - (1 << stc->msb_pts_shift);
754 *pts = stc->last_pts + pts_delta;
755 if (flags & FLAG_SIZE_MSB)
756 size += size_mul * ffio_read_varlen(bc);
757 if (flags & FLAG_MATCH_TIME)
759 if (flags & FLAG_HEADER_IDX)
760 *header_idx = ffio_read_varlen(bc);
761 if (flags & FLAG_RESERVED)
762 reserved_count = ffio_read_varlen(bc);
763 for (i = 0; i < reserved_count; i++)
764 ffio_read_varlen(bc);
766 if (*header_idx >= (unsigned)nut->header_count) {
767 av_log(s, AV_LOG_ERROR, "header_idx invalid\n");
768 return AVERROR_INVALIDDATA;
772 size -= nut->header_len[*header_idx];
774 if (flags & FLAG_CHECKSUM) {
775 avio_rb32(bc); // FIXME check this
776 } else if (size > 2 * nut->max_distance || FFABS(stc->last_pts - *pts) >
777 stc->max_pts_distance) {
778 av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n");
779 return AVERROR_INVALIDDATA;
782 stc->last_pts = *pts;
783 stc->last_flags = flags;
788 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code)
790 AVFormatContext *s = nut->avf;
791 AVIOContext *bc = s->pb;
792 int size, stream_id, discard;
793 int64_t pts, last_IP_pts;
797 size = decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code);
801 stc = &nut->stream[stream_id];
803 if (stc->last_flags & FLAG_KEY)
804 stc->skip_until_key_frame = 0;
806 discard = s->streams[stream_id]->discard;
807 last_IP_pts = s->streams[stream_id]->last_IP_pts;
808 if ((discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY)) ||
809 (discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE &&
810 last_IP_pts > pts) ||
811 discard >= AVDISCARD_ALL ||
812 stc->skip_until_key_frame) {
817 av_new_packet(pkt, size + nut->header_len[header_idx]);
818 memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]);
819 pkt->pos = avio_tell(bc); // FIXME
820 avio_read(bc, pkt->data + nut->header_len[header_idx], size);
822 pkt->stream_index = stream_id;
823 if (stc->last_flags & FLAG_KEY)
824 pkt->flags |= AV_PKT_FLAG_KEY;
830 static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
832 NUTContext *nut = s->priv_data;
833 AVIOContext *bc = s->pb;
834 int i, frame_code = 0, ret, skip;
835 int64_t ts, back_ptr;
838 int64_t pos = avio_tell(bc);
839 uint64_t tmp = nut->next_startcode;
840 nut->next_startcode = 0;
845 frame_code = avio_r8(bc);
848 if (frame_code == 'N') {
850 for (i = 1; i < 8; i++)
851 tmp = (tmp << 8) + avio_r8(bc);
856 case STREAM_STARTCODE:
857 case INDEX_STARTCODE:
858 skip = get_packetheader(nut, bc, 0, tmp);
862 if (decode_info_header(nut) < 0)
865 case SYNCPOINT_STARTCODE:
866 if (decode_syncpoint(nut, &ts, &back_ptr) < 0)
868 frame_code = avio_r8(bc);
870 ret = decode_frame(nut, pkt, frame_code);
873 else if (ret == 1) // OK but discard packet
877 av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos);
878 tmp = find_any_startcode(bc, nut->last_syncpoint_pos + 1);
880 return AVERROR_INVALIDDATA;
881 av_log(s, AV_LOG_DEBUG, "sync\n");
882 nut->next_startcode = tmp;
887 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,
888 int64_t *pos_arg, int64_t pos_limit)
890 NUTContext *nut = s->priv_data;
891 AVIOContext *bc = s->pb;
892 int64_t pos, pts, back_ptr;
893 av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n",
894 stream_index, *pos_arg, pos_limit);
898 pos = find_startcode(bc, SYNCPOINT_STARTCODE, pos) + 1;
900 assert(nut->next_startcode == 0);
901 av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n");
902 return AV_NOPTS_VALUE;
904 } while (decode_syncpoint(nut, &pts, &back_ptr) < 0);
906 assert(nut->last_syncpoint_pos == *pos_arg);
908 av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts, back_ptr);
909 if (stream_index == -1)
911 else if (stream_index == -2)
917 static int read_seek(AVFormatContext *s, int stream_index,
918 int64_t pts, int flags)
920 NUTContext *nut = s->priv_data;
921 AVStream *st = s->streams[stream_index];
922 Syncpoint dummy = { .ts = pts * av_q2d(st->time_base) * AV_TIME_BASE };
923 Syncpoint nopts_sp = { .ts = AV_NOPTS_VALUE, .back_ptr = AV_NOPTS_VALUE };
924 Syncpoint *sp, *next_node[2] = { &nopts_sp, &nopts_sp };
925 int64_t pos, pos2, ts;
928 if (st->index_entries) {
929 int index = av_index_search_timestamp(st, pts, flags);
933 pos2 = st->index_entries[index].pos;
934 ts = st->index_entries[index].timestamp;
936 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pts_cmp,
937 (void **) next_node);
938 av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n",
939 next_node[0]->pos, next_node[1]->pos, next_node[0]->ts,
941 pos = ff_gen_search(s, -1, dummy.ts, next_node[0]->pos,
942 next_node[1]->pos, next_node[1]->pos,
943 next_node[0]->ts, next_node[1]->ts,
944 AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp);
946 if (!(flags & AVSEEK_FLAG_BACKWARD)) {
947 dummy.pos = pos + 16;
948 next_node[1] = &nopts_sp;
949 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
950 (void **) next_node);
951 pos2 = ff_gen_search(s, -2, dummy.pos, next_node[0]->pos,
952 next_node[1]->pos, next_node[1]->pos,
953 next_node[0]->back_ptr, next_node[1]->back_ptr,
954 flags, &ts, nut_read_timestamp);
957 // FIXME dir but I think it does not matter
960 sp = av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
964 pos2 = sp->back_ptr - 15;
966 av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2);
967 pos = find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2);
968 avio_seek(s->pb, pos, SEEK_SET);
969 av_log(NULL, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos);
970 if (pos2 > pos || pos2 + 15 < pos)
971 av_log(NULL, AV_LOG_ERROR, "no syncpoint at backptr pos\n");
972 for (i = 0; i < s->nb_streams; i++)
973 nut->stream[i].skip_until_key_frame = 1;
978 static int nut_read_close(AVFormatContext *s)
980 NUTContext *nut = s->priv_data;
983 av_freep(&nut->time_base);
984 av_freep(&nut->stream);
986 for (i = 1; i < nut->header_count; i++)
987 av_freep(&nut->header[i]);
992 AVInputFormat ff_nut_demuxer = {
994 .long_name = NULL_IF_CONFIG_SMALL("NUT format"),
995 .priv_data_size = sizeof(NUTContext),
996 .read_probe = nut_probe,
997 .read_header = nut_read_header,
998 .read_packet = nut_read_packet,
999 .read_close = nut_read_close,
1000 .read_seek = read_seek,
1001 .extensions = "nut",
1002 .codec_tag = (const AVCodecTag * const []) {
1003 ff_codec_bmp_tags, ff_nut_video_tags, ff_codec_wav_tags,
1004 ff_nut_subtitle_tags, 0