register nut muxer if libnut is used
[libav.git] / libavformat / nutdec.c
CommitLineData
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1/*
2 * "NUT" Container Format demuxer
3 * Copyright (c) 2004-2006 Michael Niedermayer
4 * Copyright (c) 2003 Alex Beregszaszi
5 *
6 * This file is part of FFmpeg.
7 *
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.
12 *
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.
17 *
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
21 *
22 */
23
24#include "nut.h"
25
26#undef NDEBUG
27#include <assert.h>
28
29static uint64_t get_v(ByteIOContext *bc/*, maxstuffing*/){
30 uint64_t val = 0;
31
32 for(;;)
33 {
34 int tmp = get_byte(bc);
35
36// if(tmp=0x80){
37// if(!maxstuffing-- || val)
38// return -1;
39// }
40
41 if (tmp&0x80)
42 val= (val<<7) + tmp - 0x80;
43 else{
44 return (val<<7) + tmp;
45 }
46 }
47 return -1;
48}
49
50static int get_str(ByteIOContext *bc, char *string, unsigned int maxlen){
51 unsigned int len= get_v(bc);
52
53 if(len && maxlen)
54 get_buffer(bc, string, FFMIN(len, maxlen));
55 while(len > maxlen){
56 get_byte(bc);
57 len--;
58 }
59
60 if(maxlen)
61 string[FFMIN(len, maxlen-1)]= 0;
62
63 if(maxlen == len)
64 return -1;
65 else
66 return 0;
67}
68
69static int64_t get_s(ByteIOContext *bc){
70 int64_t v = get_v(bc) + 1;
71
72 if (v&1) return -(v>>1);
73 else return (v>>1);
74}
75
76static uint64_t get_fourcc(ByteIOContext *bc){
77 unsigned int len= get_v(bc);
78
79 if (len==2) return get_le16(bc);
80 else if(len==4) return get_le32(bc);
81 else return -1;
82}
83
84#ifdef TRACE
85static inline uint64_t get_v_trace(ByteIOContext *bc, char *file, char *func, int line){
86 uint64_t v= get_v(bc);
87
88 printf("get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
89 return v;
90}
91
92static inline int64_t get_s_trace(ByteIOContext *bc, char *file, char *func, int line){
93 int64_t v= get_s(bc);
94
95 printf("get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
96 return v;
97}
98
99static inline uint64_t get_vb_trace(ByteIOContext *bc, char *file, char *func, int line){
100 uint64_t v= get_vb(bc);
101
102 printf("get_vb %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
103 return v;
104}
105#define get_v(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
106#define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
107#define get_vb(bc) get_vb_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
108#endif
109
110static int get_packetheader(NUTContext *nut, ByteIOContext *bc, int calculate_checksum)
111{
112 int64_t start, size;
113// start= url_ftell(bc) - 8;
114
115 size= get_v(bc);
116
117 init_checksum(bc, calculate_checksum ? av_crc04C11DB7_update : NULL, 1);
118
119// nut->packet_start[2] = start;
120// nut->written_packet_size= size;
121
122 return size;
123}
124
125static int check_checksum(ByteIOContext *bc){
126 unsigned long checksum= get_checksum(bc);
127// return checksum != get_be32(bc);
128
129 av_log(NULL, AV_LOG_ERROR, "%08X %08X\n", checksum, (int)get_be32(bc));
130
131 return 0;
132}
133
134static uint64_t find_any_startcode(ByteIOContext *bc, int64_t pos){
135 uint64_t state=0;
136
137 if(pos >= 0)
138 url_fseek(bc, pos, SEEK_SET); //note, this may fail if the stream isnt seekable, but that shouldnt matter, as in this case we simply start where we are currently
139
140 while(!url_feof(bc)){
141 state= (state<<8) | get_byte(bc);
142 if((state>>56) != 'N')
143 continue;
144 switch(state){
145 case MAIN_STARTCODE:
146 case STREAM_STARTCODE:
147 case SYNCPOINT_STARTCODE:
148 case INFO_STARTCODE:
149 case INDEX_STARTCODE:
150 return state;
151 }
152 }
153
154 return 0;
155}
156
157/**
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 * @returns the position of the startcode or -1 if not found
162 */
163static int64_t find_startcode(ByteIOContext *bc, uint64_t code, int64_t pos){
164 for(;;){
165 uint64_t startcode= find_any_startcode(bc, pos);
166 if(startcode == code)
167 return url_ftell(bc) - 8;
168 else if(startcode == 0)
169 return -1;
170 pos=-1;
171 }
172}
173
174static int64_t lsb2full(StreamContext *stream, int64_t lsb){
175 int64_t mask = (1<<stream->msb_pts_shift)-1;
176 int64_t delta= stream->last_pts - mask/2;
177 return ((lsb - delta)&mask) + delta;
178}
179
180static int nut_probe(AVProbeData *p){
181 int i;
182 uint64_t code= 0;
183
184 for (i = 0; i < p->buf_size; i++) {
185 code = (code << 8) | p->buf[i];
186 if (code == MAIN_STARTCODE)
187 return AVPROBE_SCORE_MAX;
188 }
189 return 0;
190}
191
192#define GET_V(dst, check) \
193 tmp= get_v(bc);\
194 if(!(check)){\
195 av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp);\
196 return -1;\
197 }\
198 dst= tmp;
199
200static int skip_reserved(ByteIOContext *bc, int64_t pos){
201 pos -= url_ftell(bc);
202
203 if(pos<0){
204 url_fseek(bc, pos, SEEK_CUR);
205 return -1;
206 }else{
207 while(pos--)
208 get_byte(bc);
209 return 0;
210 }
211}
212
213static int decode_main_header(NUTContext *nut){
214 AVFormatContext *s= nut->avf;
215 ByteIOContext *bc = &s->pb;
216 uint64_t tmp, end;
217 unsigned int stream_count;
218 int i, j, tmp_stream, tmp_mul, tmp_pts, tmp_size, count, tmp_res;
219
220 end= get_packetheader(nut, bc, 1);
221 end += url_ftell(bc) - 4;
222
223 GET_V(tmp , tmp >=2 && tmp <= 3)
224 GET_V(stream_count , tmp > 0 && tmp <=MAX_STREAMS)
225
226 nut->max_distance = get_v(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;
230 }
231
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));
234
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(ff_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 -1;
241 }
242 }
243 tmp_pts=0;
244 tmp_mul=1;
245 tmp_stream=0;
246 for(i=0; i<256;){
247 int tmp_flags = get_v(bc);
248 int tmp_fields= get_v(bc);
249 if(tmp_fields>0) tmp_pts = get_s(bc);
250 if(tmp_fields>1) tmp_mul = get_v(bc);
251 if(tmp_fields>2) tmp_stream= get_v(bc);
252 if(tmp_fields>3) tmp_size = get_v(bc);
253 else tmp_size = 0;
254 if(tmp_fields>4) tmp_res = get_v(bc);
255 else tmp_res = 0;
256 if(tmp_fields>5) count = get_v(bc);
257 else count = tmp_mul - tmp_size;
258
259 while(tmp_fields-- > 6)
260 get_v(bc);
261
262 if(count == 0 || i+count > 256){
263 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
264 return -1;
265 }
266 if(tmp_stream >= stream_count){
267 av_log(s, AV_LOG_ERROR, "illegal stream number\n");
268 return -1;
269 }
270
271 for(j=0; j<count; j++,i++){
272 if (i == 'N') {
273 nut->frame_code[i].flags= FLAG_INVALID;
274 j--;
275 continue;
276 }
277 nut->frame_code[i].flags = tmp_flags ;
278 nut->frame_code[i].pts_delta = tmp_pts ;
279 nut->frame_code[i].stream_id = tmp_stream;
280 nut->frame_code[i].size_mul = tmp_mul ;
281 nut->frame_code[i].size_lsb = tmp_size+j;
282 nut->frame_code[i].reserved_count = tmp_res ;
283 }
284 }
285 assert(nut->frame_code['N'].flags == FLAG_INVALID);
286
287 if(skip_reserved(bc, end) || check_checksum(bc)){
288 av_log(s, AV_LOG_ERROR, "Main header checksum mismatch\n");
289 return -1;
290 }
291
292 nut->stream = av_mallocz(sizeof(StreamContext)*stream_count);
293 for(i=0; i<stream_count; i++){
294 av_new_stream(s, i);
295 }
296
297 return 0;
298}
299
300static int decode_stream_header(NUTContext *nut){
301 AVFormatContext *s= nut->avf;
302 ByteIOContext *bc = &s->pb;
303 StreamContext *stc;
304 int class, nom, denom, stream_id;
305 uint64_t tmp, end;
306 AVStream *st;
307
308 end= get_packetheader(nut, bc, 1);
309 end += url_ftell(bc) - 4;
310
311 GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base.num);
312 stc= &nut->stream[stream_id];
313
314 st = s->streams[stream_id];
315 if (!st)
316 return AVERROR_NOMEM;
317
318 class = get_v(bc);
319 tmp = get_fourcc(bc);
320 st->codec->codec_tag= tmp;
321 switch(class)
322 {
323 case 0:
324 st->codec->codec_type = CODEC_TYPE_VIDEO;
325 st->codec->codec_id = codec_get_bmp_id(tmp);
326 if (st->codec->codec_id == CODEC_ID_NONE)
327 av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
328 break;
329 case 1:
330 st->codec->codec_type = CODEC_TYPE_AUDIO;
331 st->codec->codec_id = codec_get_wav_id(tmp);
332 if (st->codec->codec_id == CODEC_ID_NONE)
333 av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
334 break;
335 case 2:
336// st->codec->codec_type = CODEC_TYPE_TEXT;
337// break;
338 case 3:
339 st->codec->codec_type = CODEC_TYPE_DATA;
340 break;
341 default:
342 av_log(s, AV_LOG_ERROR, "Unknown stream class (%d)\n", class);
343 return -1;
344 }
345 GET_V(stc->time_base_id , tmp < nut->time_base_count);
346 GET_V(stc->msb_pts_shift , tmp < 16);
347 stc->max_pts_distance= get_v(bc);
348 GET_V(stc->decode_delay , tmp < 1000); //sanity limit, raise this if moors law is true
349 st->codec->has_b_frames= stc->decode_delay;
350 get_v(bc); //stream flags
351
352 GET_V(st->codec->extradata_size, tmp < (1<<30));
353 if(st->codec->extradata_size){
354 st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
355 get_buffer(bc, st->codec->extradata, st->codec->extradata_size);
356 }
357
358 if (st->codec->codec_type == CODEC_TYPE_VIDEO){
359 GET_V(st->codec->width , tmp > 0)
360 GET_V(st->codec->height, tmp > 0)
361 st->codec->sample_aspect_ratio.num= get_v(bc);
362 st->codec->sample_aspect_ratio.den= get_v(bc);
363 if((!st->codec->sample_aspect_ratio.num) != (!st->codec->sample_aspect_ratio.den)){
364 av_log(s, AV_LOG_ERROR, "invalid aspect ratio\n");
365 return -1;
366 }
367 get_v(bc); /* csp type */
368 }else if (st->codec->codec_type == CODEC_TYPE_AUDIO){
369 GET_V(st->codec->sample_rate , tmp > 0)
370 tmp= get_v(bc); // samplerate_den
371 if(tmp > st->codec->sample_rate){
372 av_log(s, AV_LOG_ERROR, "bleh, libnut muxed this ;)\n");
373 st->codec->sample_rate= tmp;
374 }
375 GET_V(st->codec->channels, tmp > 0)
376 }
377 if(skip_reserved(bc, end) || check_checksum(bc)){
378 av_log(s, AV_LOG_ERROR, "Stream header %d checksum mismatch\n", stream_id);
379 return -1;
380 }
381 stc->time_base= nut->time_base[stc->time_base_id];
382 av_set_pts_info(s->streams[stream_id], 63, stc->time_base.num, stc->time_base.den);
383 return 0;
384}
385
386static int decode_info_header(NUTContext *nut){
387 AVFormatContext *s= nut->avf;
388 ByteIOContext *bc = &s->pb;
389 uint64_t tmp;
390 unsigned int stream_id_plus1, chapter_start, chapter_len, count;
391 int chapter_id, i;
392 int64_t value, end;
393 char name[256], str_value[1024], type_str[256], *type= type_str;
394
395 end= get_packetheader(nut, bc, 1);
396 end += url_ftell(bc) - 4;
397
398 GET_V(stream_id_plus1, tmp <= s->nb_streams)
399 chapter_id = get_s(bc);
400 chapter_start= get_v(bc);
401 chapter_len = get_v(bc);
402 count = get_v(bc);
403 for(i=0; i<count; i++){
404 get_str(bc, name, sizeof(name));
405 value= get_s(bc);
406 if(value == -1){
407 type= "UTF-8";
408 get_str(bc, str_value, sizeof(str_value));
409 }else if(value == -2){
410 get_str(bc, type, sizeof(type));
411 get_str(bc, str_value, sizeof(str_value));
412 }else if(value == -3){
413 type= "s";
414 value= get_s(bc);
415 }else if(value == -4){
416 type= "t";
417 value= get_v(bc);
418 }else if(value < -4){
419 type= "r";
420 get_s(bc);
421 }else{
422 type= "v";
423 }
424
425 if(chapter_id==0 && !strcmp(type, "UTF-8")){
426 if (!strcmp(name, "Author"))
427 pstrcpy(s->author , sizeof(s->author) , str_value);
428 else if(!strcmp(name, "Title"))
429 pstrcpy(s->title , sizeof(s->title) , str_value);
430 else if(!strcmp(name, "Copyright"))
431 pstrcpy(s->copyright, sizeof(s->copyright), str_value);
432 else if(!strcmp(name, "Description"))
433 pstrcpy(s->comment , sizeof(s->comment) , str_value);
434 }
435 }
436
437 if(skip_reserved(bc, end) || check_checksum(bc)){
438 av_log(s, AV_LOG_ERROR, "Info header checksum mismatch\n");
439 return -1;
440 }
441 return 0;
442}
443
444static int decode_syncpoint(NUTContext *nut){
445 AVFormatContext *s= nut->avf;
446 ByteIOContext *bc = &s->pb;
447 int64_t end;
448 uint64_t tmp;
449 int i;
450 AVRational time_base;
451
faf7cbf1 452 nut->last_syncpoint_pos= url_ftell(bc)-8;
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453
454 end= get_packetheader(nut, bc, 1);
455 end += url_ftell(bc) - 4;
456
457 tmp= get_v(bc);
458 get_v(bc); //back_ptr_div16
459
460 time_base= nut->time_base[tmp % nut->time_base_count];
461 for(i=0; i<s->nb_streams; i++){
462 nut->stream[i].last_pts= av_rescale_q(tmp / nut->time_base_count, time_base, nut->stream[i].time_base); //FIXME rounding and co
463 //last_key_frame ?
464 }
465 //FIXME put this in a reset func maybe
466
467 if(skip_reserved(bc, end) || check_checksum(bc)){
faf7cbf1 468 av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n");
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469 return -1;
470 }
471 return 0;
472}
473
474static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
475{
476 NUTContext *nut = s->priv_data;
477 ByteIOContext *bc = &s->pb;
478 int64_t pos;
479 int inited_stream_count;
480
481 nut->avf= s;
482
483 /* main header */
484 pos=0;
7b0d75fc 485 do{
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486 pos= find_startcode(bc, MAIN_STARTCODE, pos)+1;
487 if (pos<0+1){
488 av_log(s, AV_LOG_ERROR, "no main startcode found\n");
489 return -1;
490 }
7b0d75fc 491 }while(decode_main_header(nut) < 0);
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492
493 /* stream headers */
494 pos=0;
495 for(inited_stream_count=0; inited_stream_count < s->nb_streams;){
496 pos= find_startcode(bc, STREAM_STARTCODE, pos)+1;
497 if (pos<0+1){
498 av_log(s, AV_LOG_ERROR, "not all stream headers found\n");
499 return -1;
500 }
501 if(decode_stream_header(nut) >= 0)
502 inited_stream_count++;
503 }
504
505 /* info headers */
506 pos=0;
507 for(;;){
508 uint64_t startcode= find_any_startcode(bc, pos);
509 pos= url_ftell(bc);
510
511 if(startcode==0){
512 av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
513 return -1;
514 }else if(startcode == SYNCPOINT_STARTCODE){
515 nut->next_startcode= startcode;
516 break;
517 }else if(startcode != INFO_STARTCODE){
518 continue;
519 }
520
521 decode_info_header(nut);
522 }
523
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524 s->data_offset= pos-8;
525
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526 return 0;
527}
528
529static int decode_frame_header(NUTContext *nut, int *flags_ret, int64_t *pts, int *stream_id, int frame_code){
530 AVFormatContext *s= nut->avf;
531 ByteIOContext *bc = &s->pb;
532 StreamContext *stc;
533 int size, flags, size_mul, pts_delta, i, reserved_count;
534 uint64_t tmp;
535
536 if(url_ftell(bc) > nut->last_syncpoint_pos + nut->max_distance){
faf7cbf1 537 av_log(s, AV_LOG_ERROR, "last frame must have been damaged %Ld > %Ld + %d\n", url_ftell(bc), nut->last_syncpoint_pos, nut->max_distance);
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538 return -1;
539 }
540
541 flags = nut->frame_code[frame_code].flags;
542 size_mul = nut->frame_code[frame_code].size_mul;
543 size = nut->frame_code[frame_code].size_lsb;
544 *stream_id = nut->frame_code[frame_code].stream_id;
545 pts_delta = nut->frame_code[frame_code].pts_delta;
546 reserved_count = nut->frame_code[frame_code].reserved_count;
547
548 if(flags & FLAG_INVALID)
549 return -1;
550 if(flags & FLAG_CODED)
551 flags ^= get_v(bc);
552 if(flags & FLAG_STREAM_ID){
553 GET_V(*stream_id, tmp < s->nb_streams)
554 }
555 stc= &nut->stream[*stream_id];
556 if(flags&FLAG_CODED_PTS){
557 int coded_pts= get_v(bc);
558//FIXME check last_pts validity?
559 if(coded_pts < (1<<stc->msb_pts_shift)){
560 *pts=lsb2full(stc, coded_pts);
561 }else
562 *pts=coded_pts - (1<<stc->msb_pts_shift);
563 }else
564 *pts= stc->last_pts + pts_delta;
565 if(flags&FLAG_SIZE_MSB){
566 size += size_mul*get_v(bc);
567 }
568 if(flags&FLAG_RESERVED)
569 reserved_count= get_v(bc);
570 for(i=0; i<reserved_count; i++)
571 get_v(bc);
572 if(flags&FLAG_CHECKSUM){
573 get_be32(bc); //FIXME check this
574 }
575 *flags_ret= flags;
576
577 stc->last_pts= *pts;
578 stc->last_key_frame= flags&FLAG_KEY; //FIXME change to last flags
579
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580 if(flags&FLAG_KEY){
581 av_add_index_entry(
582 s->streams[*stream_id],
583 nut->last_syncpoint_pos,
584 *pts,
585 0,
586 0,
587 AVINDEX_KEYFRAME);
588 }
589
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590 return size;
591}
592
593static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code){
594 AVFormatContext *s= nut->avf;
595 ByteIOContext *bc = &s->pb;
596 int size, stream_id, flags, discard;
597 int64_t pts, last_IP_pts;
598
599 size= decode_frame_header(nut, &flags, &pts, &stream_id, frame_code);
600 if(size < 0)
601 return -1;
602
603 discard= s->streams[ stream_id ]->discard;
604 last_IP_pts= s->streams[ stream_id ]->last_IP_pts;
605 if( (discard >= AVDISCARD_NONKEY && !(flags & FLAG_KEY))
606 ||(discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE && last_IP_pts > pts)
607 || discard >= AVDISCARD_ALL){
608 url_fskip(bc, size);
609 return 1;
610 }
611
612 av_get_packet(bc, pkt, size);
613 pkt->stream_index = stream_id;
614 if (flags & FLAG_KEY)
615 pkt->flags |= PKT_FLAG_KEY;
616 pkt->pts = pts;
617
618 return 0;
619}
620
621static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
622{
623 NUTContext *nut = s->priv_data;
624 ByteIOContext *bc = &s->pb;
625 int i, frame_code=0, ret, skip;
626
627 for(;;){
628 int64_t pos= url_ftell(bc);
629 uint64_t tmp= nut->next_startcode;
630 nut->next_startcode=0;
631
632 if (url_feof(bc))
633 return -1;
634
635 if(tmp){
636 pos-=8;
637 }else{
638 frame_code = get_byte(bc);
639 if(frame_code == 'N'){
640 tmp= frame_code;
641 for(i=1; i<8; i++)
642 tmp = (tmp<<8) + get_byte(bc);
643 }
644 }
645 switch(tmp){
646 case MAIN_STARTCODE:
647 case STREAM_STARTCODE:
648 case INDEX_STARTCODE:
649 skip= get_packetheader(nut, bc, 0);
650 url_fseek(bc, skip, SEEK_CUR);
651 break;
652 case INFO_STARTCODE:
653 if(decode_info_header(nut)<0)
654 goto resync;
655 break;
656 case SYNCPOINT_STARTCODE:
657 if(decode_syncpoint(nut)<0)
658 goto resync;
659 frame_code = get_byte(bc);
660 case 0:
661 ret= decode_frame(nut, pkt, frame_code);
662 if(ret==0)
663 return 0;
664 else if(ret==1) //ok but discard packet
665 break;
666 default:
667resync:
668av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos);
669 tmp= find_any_startcode(bc, pos+1);
670 if(tmp==0)
671 return -1;
672av_log(s, AV_LOG_DEBUG, "sync\n");
673 nut->next_startcode= tmp;
674 }
675 }
676}
677
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678static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos_arg, int64_t pos_limit){
679 NUTContext *nut = s->priv_data;
680 ByteIOContext *bc = &s->pb;
681 int64_t pos, pts;
682 int frame_code, stream_id,size, flags;
683av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n", stream_index, *pos_arg, pos_limit);
684
685 pos= *pos_arg;
686resync:
687 do{
688 pos= find_startcode(bc, SYNCPOINT_STARTCODE, pos)+1;
689 if(pos < 1){
690 assert(nut->next_startcode == 0);
691 av_log(s, AV_LOG_ERROR, "read_timestamp failed\n");
692 return AV_NOPTS_VALUE;
693 }
694 }while(decode_syncpoint(nut) < 0);
695 *pos_arg = pos-1;
696 assert(nut->last_syncpoint_pos == *pos_arg);
697
698 do{
699 frame_code= get_byte(bc);
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700 if(frame_code == 'N'){
701 pos= url_ftell(bc)-1;
faf7cbf1 702 goto resync;
9a626982 703 }
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704 //FIXME consider pos_limit and eof
705 size= decode_frame_header(nut, &flags, &pts, &stream_id, frame_code);
706
707 if(size < 0)
708 goto resync;
709
710 url_fseek(bc, size, SEEK_CUR);
711 }while(stream_id != stream_index || !(flags & FLAG_KEY));
712 assert(nut->next_startcode == 0);
713 av_log(s, AV_LOG_DEBUG, "read_timestamp success\n");
714
715 return pts;
716}
717
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718static int nut_read_close(AVFormatContext *s)
719{
720 NUTContext *nut = s->priv_data;
721
722 av_freep(&nut->time_base);
723 av_freep(&nut->stream);
724
725 return 0;
726}
727
728#ifdef CONFIG_NUT_DEMUXER
729AVInputFormat nut_demuxer = {
730 "nut",
731 "nut format",
732 sizeof(NUTContext),
733 nut_probe,
734 nut_read_header,
735 nut_read_packet,
736 nut_read_close,
737 NULL,
faf7cbf1 738 nut_read_timestamp,
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739 .extensions = "nut",
740};
741#endif