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){
37 unsigned int len= ffio_read_varlen(bc);
40 avio_read(bc, string, FFMIN(len, maxlen));
47 string[FFMIN(len, maxlen-1)]= 0;
55 static int64_t get_s(AVIOContext *bc){
56 int64_t v = ffio_read_varlen(bc) + 1;
58 if (v&1) return -(v>>1);
62 static uint64_t get_fourcc(AVIOContext *bc){
63 unsigned int len= ffio_read_varlen(bc);
65 if (len==2) return avio_rl16(bc);
66 else if(len==4) return avio_rl32(bc);
71 static inline uint64_t get_v_trace(AVIOContext *bc, char *file, char *func, int line){
72 uint64_t v= ffio_read_varlen(bc);
74 av_log(NULL, AV_LOG_DEBUG, "get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
78 static inline int64_t get_s_trace(AVIOContext *bc, char *file, char *func, int line){
81 av_log(NULL, AV_LOG_DEBUG, "get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
85 static inline uint64_t get_vb_trace(AVIOContext *bc, char *file, char *func, int line){
86 uint64_t v= get_vb(bc);
88 av_log(NULL, AV_LOG_DEBUG, "get_vb %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
91 #define ffio_read_varlen(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
92 #define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
93 #define get_vb(bc) get_vb_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
96 static int get_packetheader(NUTContext *nut, AVIOContext *bc, int calculate_checksum, uint64_t startcode)
99 // start= avio_tell(bc) - 8;
101 startcode= av_be2ne64(startcode);
102 startcode= ff_crc04C11DB7_update(0, (uint8_t*)&startcode, 8);
104 ffio_init_checksum(bc, ff_crc04C11DB7_update, startcode);
105 size= ffio_read_varlen(bc);
108 if(ffio_get_checksum(bc) && size > 4096)
111 ffio_init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0);
116 static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos){
120 avio_seek(bc, pos, SEEK_SET); //note, this may fail if the stream is not seekable, but that should not matter, as in this case we simply start where we currently are
122 while(!url_feof(bc)){
123 state= (state<<8) | avio_r8(bc);
124 if((state>>56) != 'N')
128 case STREAM_STARTCODE:
129 case SYNCPOINT_STARTCODE:
131 case INDEX_STARTCODE:
140 * Find the given startcode.
141 * @param code the startcode
142 * @param pos the start position of the search, or -1 if the current position
143 * @return the position of the startcode or -1 if not found
145 static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos){
147 uint64_t startcode= find_any_startcode(bc, pos);
148 if(startcode == code)
149 return avio_tell(bc) - 8;
150 else if(startcode == 0)
156 static int nut_probe(AVProbeData *p){
160 for (i = 0; i < p->buf_size; i++) {
161 code = (code << 8) | p->buf[i];
162 if (code == MAIN_STARTCODE)
163 return AVPROBE_SCORE_MAX;
168 #define GET_V(dst, check) \
169 tmp= ffio_read_varlen(bc);\
171 av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp);\
176 static int skip_reserved(AVIOContext *bc, int64_t pos){
177 pos -= avio_tell(bc);
179 avio_seek(bc, pos, SEEK_CUR);
188 static int decode_main_header(NUTContext *nut){
189 AVFormatContext *s= nut->avf;
190 AVIOContext *bc = s->pb;
192 unsigned int stream_count;
193 int i, j, tmp_stream, tmp_mul, tmp_pts, tmp_size, count, tmp_res, tmp_head_idx;
195 end= get_packetheader(nut, bc, 1, MAIN_STARTCODE);
196 end += avio_tell(bc);
198 GET_V(tmp , tmp >=2 && tmp <= 3)
199 GET_V(stream_count , tmp > 0 && tmp <= NUT_MAX_STREAMS)
201 nut->max_distance = ffio_read_varlen(bc);
202 if(nut->max_distance > 65536){
203 av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance);
204 nut->max_distance= 65536;
207 GET_V(nut->time_base_count, tmp>0 && tmp<INT_MAX / sizeof(AVRational))
208 nut->time_base= av_malloc(nut->time_base_count * sizeof(AVRational));
210 for(i=0; i<nut->time_base_count; i++){
211 GET_V(nut->time_base[i].num, tmp>0 && tmp<(1ULL<<31))
212 GET_V(nut->time_base[i].den, tmp>0 && tmp<(1ULL<<31))
213 if(av_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1){
214 av_log(s, AV_LOG_ERROR, "time base invalid\n");
215 return AVERROR_INVALIDDATA;
223 int tmp_flags = ffio_read_varlen(bc);
224 int tmp_fields= ffio_read_varlen(bc);
225 if(tmp_fields>0) tmp_pts = get_s(bc);
226 if(tmp_fields>1) tmp_mul = ffio_read_varlen(bc);
227 if(tmp_fields>2) tmp_stream= ffio_read_varlen(bc);
228 if(tmp_fields>3) tmp_size = ffio_read_varlen(bc);
230 if(tmp_fields>4) tmp_res = ffio_read_varlen(bc);
232 if(tmp_fields>5) count = ffio_read_varlen(bc);
233 else count = tmp_mul - tmp_size;
234 if(tmp_fields>6) get_s(bc);
235 if(tmp_fields>7) tmp_head_idx= ffio_read_varlen(bc);
237 while(tmp_fields-- > 8)
238 ffio_read_varlen(bc);
240 if(count == 0 || i+count > 256){
241 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
242 return AVERROR_INVALIDDATA;
244 if(tmp_stream >= stream_count){
245 av_log(s, AV_LOG_ERROR, "illegal stream number\n");
246 return AVERROR_INVALIDDATA;
249 for(j=0; j<count; j++,i++){
251 nut->frame_code[i].flags= FLAG_INVALID;
255 nut->frame_code[i].flags = tmp_flags ;
256 nut->frame_code[i].pts_delta = tmp_pts ;
257 nut->frame_code[i].stream_id = tmp_stream;
258 nut->frame_code[i].size_mul = tmp_mul ;
259 nut->frame_code[i].size_lsb = tmp_size+j;
260 nut->frame_code[i].reserved_count = tmp_res ;
261 nut->frame_code[i].header_idx = tmp_head_idx;
264 assert(nut->frame_code['N'].flags == FLAG_INVALID);
266 if(end > avio_tell(bc) + 4){
268 GET_V(nut->header_count, tmp<128U)
270 for(i=1; i<nut->header_count; i++){
271 GET_V(nut->header_len[i], tmp>0 && tmp<256);
272 rem -= nut->header_len[i];
274 av_log(s, AV_LOG_ERROR, "invalid elision header\n");
275 return AVERROR_INVALIDDATA;
277 nut->header[i]= av_malloc(nut->header_len[i]);
278 avio_read(bc, nut->header[i], nut->header_len[i]);
280 assert(nut->header_len[0]==0);
283 if(skip_reserved(bc, end) || ffio_get_checksum(bc)){
284 av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n");
285 return AVERROR_INVALIDDATA;
288 nut->stream = av_mallocz(sizeof(StreamContext)*stream_count);
289 for(i=0; i<stream_count; i++){
290 avformat_new_stream(s, NULL);
296 static int decode_stream_header(NUTContext *nut){
297 AVFormatContext *s= nut->avf;
298 AVIOContext *bc = s->pb;
300 int class, stream_id;
304 end= get_packetheader(nut, bc, 1, STREAM_STARTCODE);
305 end += avio_tell(bc);
307 GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base);
308 stc= &nut->stream[stream_id];
310 st = s->streams[stream_id];
312 return AVERROR(ENOMEM);
314 class = ffio_read_varlen(bc);
315 tmp = get_fourcc(bc);
316 st->codec->codec_tag= tmp;
320 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
321 st->codec->codec_id = av_codec_get_id(
322 (const AVCodecTag * const []) { ff_codec_bmp_tags, ff_nut_video_tags, 0 },
326 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
327 st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, tmp);
330 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
331 st->codec->codec_id = ff_codec_get_id(ff_nut_subtitle_tags, tmp);
334 st->codec->codec_type = AVMEDIA_TYPE_DATA;
337 av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class);
340 if(class<3 && st->codec->codec_id == CODEC_ID_NONE)
341 av_log(s, AV_LOG_ERROR, "Unknown codec tag '0x%04x' for stream number %d\n",
342 (unsigned int)tmp, stream_id);
344 GET_V(stc->time_base_id , tmp < nut->time_base_count);
345 GET_V(stc->msb_pts_shift , tmp < 16);
346 stc->max_pts_distance= ffio_read_varlen(bc);
347 GET_V(stc->decode_delay , tmp < 1000); //sanity limit, raise this if Moore's law is true
348 st->codec->has_b_frames= stc->decode_delay;
349 ffio_read_varlen(bc); //stream flags
351 GET_V(st->codec->extradata_size, tmp < (1<<30));
352 if(st->codec->extradata_size){
353 st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
354 avio_read(bc, st->codec->extradata, st->codec->extradata_size);
357 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO){
358 GET_V(st->codec->width , tmp > 0)
359 GET_V(st->codec->height, tmp > 0)
360 st->sample_aspect_ratio.num= ffio_read_varlen(bc);
361 st->sample_aspect_ratio.den= ffio_read_varlen(bc);
362 if((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)){
363 av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n", st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
366 ffio_read_varlen(bc); /* csp type */
367 }else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO){
368 GET_V(st->codec->sample_rate , tmp > 0)
369 ffio_read_varlen(bc); // samplerate_den
370 GET_V(st->codec->channels, tmp > 0)
372 if(skip_reserved(bc, end) || ffio_get_checksum(bc)){
373 av_log(s, AV_LOG_ERROR, "stream header %d checksum mismatch\n", stream_id);
376 stc->time_base= &nut->time_base[stc->time_base_id];
377 avpriv_set_pts_info(s->streams[stream_id], 63, stc->time_base->num, stc->time_base->den);
381 static void set_disposition_bits(AVFormatContext* avf, char* value, int stream_id){
383 for (i=0; ff_nut_dispositions[i].flag; ++i) {
384 if (!strcmp(ff_nut_dispositions[i].str, value))
385 flag = ff_nut_dispositions[i].flag;
388 av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value);
389 for (i = 0; i < avf->nb_streams; ++i)
390 if (stream_id == i || stream_id == -1)
391 avf->streams[i]->disposition |= flag;
394 static int decode_info_header(NUTContext *nut){
395 AVFormatContext *s= nut->avf;
396 AVIOContext *bc = s->pb;
397 uint64_t tmp, chapter_start, chapter_len;
398 unsigned int stream_id_plus1, count;
401 char name[256], str_value[1024], type_str[256];
403 AVChapter *chapter= NULL;
405 AVDictionary **metadata = NULL;
407 end= get_packetheader(nut, bc, 1, INFO_STARTCODE);
408 end += avio_tell(bc);
410 GET_V(stream_id_plus1, tmp <= s->nb_streams)
411 chapter_id = get_s(bc);
412 chapter_start= ffio_read_varlen(bc);
413 chapter_len = ffio_read_varlen(bc);
414 count = ffio_read_varlen(bc);
416 if(chapter_id && !stream_id_plus1){
417 int64_t start= chapter_start / nut->time_base_count;
418 chapter= avpriv_new_chapter(s, chapter_id,
419 nut->time_base[chapter_start % nut->time_base_count],
420 start, start + chapter_len, NULL);
421 metadata = &chapter->metadata;
422 } else if(stream_id_plus1) {
423 st= s->streams[stream_id_plus1 - 1];
424 metadata = &st->metadata;
426 metadata = &s->metadata;
428 for(i=0; i<count; i++){
429 get_str(bc, name, sizeof(name));
433 get_str(bc, str_value, sizeof(str_value));
434 }else if(value == -2){
435 get_str(bc, type_str, sizeof(type_str));
437 get_str(bc, str_value, sizeof(str_value));
438 }else if(value == -3){
441 }else if(value == -4){
443 value= ffio_read_varlen(bc);
444 }else if(value < -4){
451 if (stream_id_plus1 > s->nb_streams) {
452 av_log(s, AV_LOG_ERROR, "invalid stream id for info packet\n");
456 if(!strcmp(type, "UTF-8")){
457 if(chapter_id==0 && !strcmp(name, "Disposition")) {
458 set_disposition_bits(s, str_value, stream_id_plus1 - 1);
461 if(metadata && av_strcasecmp(name,"Uses")
462 && av_strcasecmp(name,"Depends") && av_strcasecmp(name,"Replaces"))
463 av_dict_set(metadata, name, str_value, 0);
467 if(skip_reserved(bc, end) || ffio_get_checksum(bc)){
468 av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n");
474 static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr){
475 AVFormatContext *s= nut->avf;
476 AVIOContext *bc = s->pb;
479 nut->last_syncpoint_pos= avio_tell(bc)-8;
481 end= get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);
482 end += avio_tell(bc);
484 tmp= ffio_read_varlen(bc);
485 *back_ptr= nut->last_syncpoint_pos - 16*ffio_read_varlen(bc);
489 ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count], tmp / nut->time_base_count);
491 if(skip_reserved(bc, end) || ffio_get_checksum(bc)){
492 av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n");
496 *ts= tmp / s->nb_streams * av_q2d(nut->time_base[tmp % s->nb_streams])*AV_TIME_BASE;
497 ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts);
502 static int find_and_decode_index(NUTContext *nut){
503 AVFormatContext *s= nut->avf;
504 AVIOContext *bc = s->pb;
506 int i, j, syncpoint_count;
507 int64_t filesize= avio_size(bc);
509 int8_t *has_keyframe;
512 avio_seek(bc, filesize-12, SEEK_SET);
513 avio_seek(bc, filesize-avio_rb64(bc), SEEK_SET);
514 if(avio_rb64(bc) != INDEX_STARTCODE){
515 av_log(s, AV_LOG_ERROR, "no index at the end\n");
519 end= get_packetheader(nut, bc, 1, INDEX_STARTCODE);
520 end += avio_tell(bc);
522 ffio_read_varlen(bc); //max_pts
523 GET_V(syncpoint_count, tmp < INT_MAX/8 && tmp > 0)
524 syncpoints= av_malloc(sizeof(int64_t)*syncpoint_count);
525 has_keyframe= av_malloc(sizeof(int8_t)*(syncpoint_count+1));
526 for(i=0; i<syncpoint_count; i++){
527 syncpoints[i] = ffio_read_varlen(bc);
528 if(syncpoints[i] <= 0)
531 syncpoints[i] += syncpoints[i-1];
534 for(i=0; i<s->nb_streams; i++){
535 int64_t last_pts= -1;
536 for(j=0; j<syncpoint_count;){
537 uint64_t x= ffio_read_varlen(bc);
544 if(n+x >= syncpoint_count + 1){
545 av_log(s, AV_LOG_ERROR, "index overflow A\n");
549 has_keyframe[n++]= flag;
550 has_keyframe[n++]= !flag;
553 if(n>=syncpoint_count + 1){
554 av_log(s, AV_LOG_ERROR, "index overflow B\n");
557 has_keyframe[n++]= x&1;
562 av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n");
565 assert(n<=syncpoint_count+1);
566 for(; j<n && j<syncpoint_count; j++){
568 uint64_t B, A= ffio_read_varlen(bc);
570 A= ffio_read_varlen(bc);
571 B= ffio_read_varlen(bc);
572 //eor_pts[j][i] = last_pts + A + B
588 if(skip_reserved(bc, end) || ffio_get_checksum(bc)){
589 av_log(s, AV_LOG_ERROR, "index checksum mismatch\n");
595 av_free(has_keyframe);
599 static int nut_read_header(AVFormatContext *s)
601 NUTContext *nut = s->priv_data;
602 AVIOContext *bc = s->pb;
604 int initialized_stream_count;
611 pos= find_startcode(bc, MAIN_STARTCODE, pos)+1;
613 av_log(s, AV_LOG_ERROR, "No main startcode found.\n");
614 return AVERROR_INVALIDDATA;
616 }while(decode_main_header(nut) < 0);
620 for(initialized_stream_count=0; initialized_stream_count < s->nb_streams;){
621 pos= find_startcode(bc, STREAM_STARTCODE, pos)+1;
623 av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n");
624 return AVERROR_INVALIDDATA;
626 if(decode_stream_header(nut) >= 0)
627 initialized_stream_count++;
633 uint64_t startcode= find_any_startcode(bc, pos);
637 av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
638 return AVERROR_INVALIDDATA;
639 }else if(startcode == SYNCPOINT_STARTCODE){
640 nut->next_startcode= startcode;
642 }else if(startcode != INFO_STARTCODE){
646 decode_info_header(nut);
649 s->data_offset= pos-8;
652 int64_t orig_pos= avio_tell(bc);
653 find_and_decode_index(nut);
654 avio_seek(bc, orig_pos, SEEK_SET);
656 assert(nut->next_startcode == SYNCPOINT_STARTCODE);
658 ff_metadata_conv_ctx(s, NULL, ff_nut_metadata_conv);
663 static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id, uint8_t *header_idx, int frame_code){
664 AVFormatContext *s= nut->avf;
665 AVIOContext *bc = s->pb;
667 int size, flags, size_mul, pts_delta, i, reserved_count;
670 if(avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance){
671 av_log(s, AV_LOG_ERROR, "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n", avio_tell(bc), nut->last_syncpoint_pos, nut->max_distance);
672 return AVERROR_INVALIDDATA;
675 flags = nut->frame_code[frame_code].flags;
676 size_mul = nut->frame_code[frame_code].size_mul;
677 size = nut->frame_code[frame_code].size_lsb;
678 *stream_id = nut->frame_code[frame_code].stream_id;
679 pts_delta = nut->frame_code[frame_code].pts_delta;
680 reserved_count = nut->frame_code[frame_code].reserved_count;
681 *header_idx = nut->frame_code[frame_code].header_idx;
683 if(flags & FLAG_INVALID)
684 return AVERROR_INVALIDDATA;
685 if(flags & FLAG_CODED)
686 flags ^= ffio_read_varlen(bc);
687 if(flags & FLAG_STREAM_ID){
688 GET_V(*stream_id, tmp < s->nb_streams)
690 stc= &nut->stream[*stream_id];
691 if(flags&FLAG_CODED_PTS){
692 int coded_pts= ffio_read_varlen(bc);
693 //FIXME check last_pts validity?
694 if(coded_pts < (1<<stc->msb_pts_shift)){
695 *pts=ff_lsb2full(stc, coded_pts);
697 *pts=coded_pts - (1<<stc->msb_pts_shift);
699 *pts= stc->last_pts + pts_delta;
700 if(flags&FLAG_SIZE_MSB){
701 size += size_mul*ffio_read_varlen(bc);
703 if(flags&FLAG_MATCH_TIME)
705 if(flags&FLAG_HEADER_IDX)
706 *header_idx= ffio_read_varlen(bc);
707 if(flags&FLAG_RESERVED)
708 reserved_count= ffio_read_varlen(bc);
709 for(i=0; i<reserved_count; i++)
710 ffio_read_varlen(bc);
712 if(*header_idx >= (unsigned)nut->header_count){
713 av_log(s, AV_LOG_ERROR, "header_idx invalid\n");
714 return AVERROR_INVALIDDATA;
718 size -= nut->header_len[*header_idx];
720 if(flags&FLAG_CHECKSUM){
721 avio_rb32(bc); //FIXME check this
722 }else if(size > 2*nut->max_distance || FFABS(stc->last_pts - *pts) > stc->max_pts_distance){
723 av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n");
724 return AVERROR_INVALIDDATA;
728 stc->last_flags= flags;
733 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code){
734 AVFormatContext *s= nut->avf;
735 AVIOContext *bc = s->pb;
736 int size, stream_id, discard;
737 int64_t pts, last_IP_pts;
741 size= decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code);
745 stc= &nut->stream[stream_id];
747 if (stc->last_flags & FLAG_KEY)
748 stc->skip_until_key_frame=0;
750 discard= s->streams[ stream_id ]->discard;
751 last_IP_pts= s->streams[ stream_id ]->last_IP_pts;
752 if( (discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY))
753 ||(discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE && last_IP_pts > pts)
754 || discard >= AVDISCARD_ALL
755 || stc->skip_until_key_frame){
760 av_new_packet(pkt, size + nut->header_len[header_idx]);
761 memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]);
762 pkt->pos= avio_tell(bc); //FIXME
763 avio_read(bc, pkt->data + nut->header_len[header_idx], size);
765 pkt->stream_index = stream_id;
766 if (stc->last_flags & FLAG_KEY)
767 pkt->flags |= AV_PKT_FLAG_KEY;
773 static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
775 NUTContext *nut = s->priv_data;
776 AVIOContext *bc = s->pb;
777 int i, frame_code=0, ret, skip;
778 int64_t ts, back_ptr;
781 int64_t pos= avio_tell(bc);
782 uint64_t tmp= nut->next_startcode;
783 nut->next_startcode=0;
788 frame_code = avio_r8(bc);
791 if(frame_code == 'N'){
794 tmp = (tmp<<8) + avio_r8(bc);
799 case STREAM_STARTCODE:
800 case INDEX_STARTCODE:
801 skip= get_packetheader(nut, bc, 0, tmp);
805 if(decode_info_header(nut)<0)
808 case SYNCPOINT_STARTCODE:
809 if(decode_syncpoint(nut, &ts, &back_ptr)<0)
811 frame_code = avio_r8(bc);
813 ret= decode_frame(nut, pkt, frame_code);
816 else if(ret==1) //ok but discard packet
820 av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos);
821 tmp= find_any_startcode(bc, nut->last_syncpoint_pos+1);
823 return AVERROR_INVALIDDATA;
824 av_log(s, AV_LOG_DEBUG, "sync\n");
825 nut->next_startcode= tmp;
830 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos_arg, int64_t pos_limit){
831 NUTContext *nut = s->priv_data;
832 AVIOContext *bc = s->pb;
833 int64_t pos, pts, back_ptr;
834 av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n", stream_index, *pos_arg, pos_limit);
838 pos= find_startcode(bc, SYNCPOINT_STARTCODE, pos)+1;
840 assert(nut->next_startcode == 0);
841 av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n");
842 return AV_NOPTS_VALUE;
844 }while(decode_syncpoint(nut, &pts, &back_ptr) < 0);
846 assert(nut->last_syncpoint_pos == *pos_arg);
848 av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts,back_ptr );
849 if (stream_index == -1) return pts;
850 else if(stream_index == -2) return back_ptr;
855 static int read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags){
856 NUTContext *nut = s->priv_data;
857 AVStream *st= s->streams[stream_index];
858 Syncpoint dummy={.ts= pts*av_q2d(st->time_base)*AV_TIME_BASE};
859 Syncpoint nopts_sp= {.ts= AV_NOPTS_VALUE, .back_ptr= AV_NOPTS_VALUE};
860 Syncpoint *sp, *next_node[2]= {&nopts_sp, &nopts_sp};
861 int64_t pos, pos2, ts;
864 if(st->index_entries){
865 int index= av_index_search_timestamp(st, pts, flags);
869 pos2= st->index_entries[index].pos;
870 ts = st->index_entries[index].timestamp;
872 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pts_cmp,
873 (void **) next_node);
874 av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n", next_node[0]->pos, next_node[1]->pos,
875 next_node[0]->ts , next_node[1]->ts);
876 pos = ff_gen_search(s, -1, dummy.ts, next_node[0]->pos, next_node[1]->pos, next_node[1]->pos,
877 next_node[0]->ts , next_node[1]->ts, AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp);
879 if(!(flags & AVSEEK_FLAG_BACKWARD)){
881 next_node[1]= &nopts_sp;
882 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
883 (void **) next_node);
884 pos2 = ff_gen_search(s, -2, dummy.pos, next_node[0]->pos , next_node[1]->pos, next_node[1]->pos,
885 next_node[0]->back_ptr, next_node[1]->back_ptr, flags, &ts, nut_read_timestamp);
888 //FIXME dir but I think it does not matter
891 sp= av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
895 pos2= sp->back_ptr - 15;
897 av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2);
898 pos= find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2);
899 avio_seek(s->pb, pos, SEEK_SET);
900 av_log(NULL, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos);
901 if(pos2 > pos || pos2 + 15 < pos){
902 av_log(NULL, AV_LOG_ERROR, "no syncpoint at backptr pos\n");
904 for(i=0; i<s->nb_streams; i++)
905 nut->stream[i].skip_until_key_frame=1;
910 static int nut_read_close(AVFormatContext *s)
912 NUTContext *nut = s->priv_data;
915 av_freep(&nut->time_base);
916 av_freep(&nut->stream);
918 for(i = 1; i < nut->header_count; i++)
919 av_freep(&nut->header[i]);
924 #if CONFIG_NUT_DEMUXER
925 AVInputFormat ff_nut_demuxer = {
927 .long_name = NULL_IF_CONFIG_SMALL("NUT format"),
928 .priv_data_size = sizeof(NUTContext),
929 .read_probe = nut_probe,
930 .read_header = nut_read_header,
931 .read_packet = nut_read_packet,
932 .read_close = nut_read_close,
933 .read_seek = read_seek,
935 .codec_tag = (const AVCodecTag * const []) { ff_codec_bmp_tags, ff_nut_video_tags, ff_codec_wav_tags, ff_nut_subtitle_tags, 0 },