9c12e76f175c8a78a641aad55d82da5f15def9ce
[libav.git] / libavformat / nut.c
1 /*
2 * "NUT" Container Format muxer and demuxer (DRAFT-200403??)
3 * Copyright (c) 2003 Alex Beregszaszi
4 * Copyright (c) 2004 Michael Niedermayer
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 *
21 * Visit the official site at http://www.nut.hu/
22 *
23 */
24
25 /*
26 * TODO:
27 * - index writing
28 * - index packet reading support
29 */
30
31 //#define DEBUG 1
32
33 #include <limits.h>
34 #include "avformat.h"
35 #include "mpegaudio.h"
36 #include "avi.h"
37
38 #undef NDEBUG
39 #include <assert.h>
40
41 //#define TRACE
42
43 //from /dev/random
44
45 #define MAIN_STARTCODE (0x7A561F5F04ADULL + (((uint64_t)('N'<<8) + 'M')<<48))
46 #define STREAM_STARTCODE (0x11405BF2F9DBULL + (((uint64_t)('N'<<8) + 'S')<<48))
47 #define KEYFRAME_STARTCODE (0xE4ADEECA4569ULL + (((uint64_t)('N'<<8) + 'K')<<48))
48 #define INDEX_STARTCODE (0xDD672F23E64EULL + (((uint64_t)('N'<<8) + 'X')<<48))
49 #define INFO_STARTCODE (0xAB68B596BA78ULL + (((uint64_t)('N'<<8) + 'I')<<48))
50
51 #define ID_STRING "nut/multimedia container\0"
52
53 #define MAX_DISTANCE (1024*16-1)
54 #define MAX_SHORT_DISTANCE (1024*4-1)
55
56 #define FLAG_DATA_SIZE 1
57 #define FLAG_KEY_FRAME 2
58 #define FLAG_INVALID 4
59
60 typedef struct {
61 uint8_t flags;
62 uint8_t stream_id_plus1;
63 uint16_t size_mul;
64 uint16_t size_lsb;
65 int16_t timestamp_delta;
66 uint8_t reserved_count;
67 } FrameCode;
68
69 typedef struct {
70 int last_key_frame;
71 int msb_timestamp_shift;
72 int rate_num;
73 int rate_den;
74 int64_t last_pts;
75 int64_t last_sync_pos; ///<pos of last 1/2 type frame
76 int decode_delay;
77 } StreamContext;
78
79 typedef struct {
80 AVFormatContext *avf;
81 int written_packet_size;
82 int64_t packet_start[3]; //0-> startcode less, 1-> short startcode 2-> long startcodes
83 FrameCode frame_code[256];
84 unsigned int stream_count;
85 uint64_t next_startcode; ///< stores the next startcode if it has alraedy been parsed but the stream isnt seekable
86 StreamContext *stream;
87 int max_distance;
88 int max_short_distance;
89 int rate_num;
90 int rate_den;
91 int short_startcode;
92 } NUTContext;
93
94 static char *info_table[][2]={
95 {NULL , NULL }, // end
96 {NULL , NULL },
97 {NULL , "UTF8"},
98 {NULL , "v"},
99 {NULL , "s"},
100 {"StreamId" , "v"},
101 {"SegmentId" , "v"},
102 {"StartTimestamp" , "v"},
103 {"EndTimestamp" , "v"},
104 {"Author" , "UTF8"},
105 {"Title" , "UTF8"},
106 {"Description" , "UTF8"},
107 {"Copyright" , "UTF8"},
108 {"Encoder" , "UTF8"},
109 {"Keyword" , "UTF8"},
110 {"Cover" , "JPEG"},
111 {"Cover" , "PNG"},
112 };
113
114 void ff_parse_specific_params(AVCodecContext *stream, int *au_rate, int *au_ssize, int *au_scale);
115
116 static void update(NUTContext *nut, int stream_index, int64_t frame_start, int frame_type, int frame_code, int key_frame, int size, int64_t pts){
117 StreamContext *stream= &nut->stream[stream_index];
118
119 stream->last_key_frame= key_frame;
120 nut->packet_start[ frame_type ]= frame_start;
121 stream->last_pts= pts;
122 }
123
124 static void reset(AVFormatContext *s, int64_t global_ts){
125 NUTContext *nut = s->priv_data;
126 int i;
127
128 for(i=0; i<s->nb_streams; i++){
129 StreamContext *stream= &nut->stream[i];
130
131 stream->last_key_frame= 1;
132
133 stream->last_pts= av_rescale(global_ts, stream->rate_num*(int64_t)nut->rate_den, stream->rate_den*(int64_t)nut->rate_num);
134 }
135 }
136
137 static void build_frame_code(AVFormatContext *s){
138 NUTContext *nut = s->priv_data;
139 int key_frame, index, pred, stream_id;
140 int start=0;
141 int end= 255;
142 int keyframe_0_esc= s->nb_streams > 2;
143 int pred_table[10];
144
145 if(keyframe_0_esc){
146 /* keyframe = 0 escape */
147 FrameCode *ft= &nut->frame_code[start];
148 ft->flags= FLAG_DATA_SIZE;
149 ft->stream_id_plus1= 0;
150 ft->size_mul=1;
151 ft->timestamp_delta=0;
152 start++;
153 }
154
155 for(stream_id= 0; stream_id<s->nb_streams; stream_id++){
156 int start2= start + (end-start)*stream_id / s->nb_streams;
157 int end2 = start + (end-start)*(stream_id+1) / s->nb_streams;
158 AVCodecContext *codec = s->streams[stream_id]->codec;
159 int is_audio= codec->codec_type == CODEC_TYPE_AUDIO;
160 int intra_only= /*codec->intra_only || */is_audio;
161 int pred_count;
162
163 for(key_frame=0; key_frame<2; key_frame++){
164 if(intra_only && keyframe_0_esc && key_frame==0)
165 continue;
166
167 {
168 FrameCode *ft= &nut->frame_code[start2];
169 ft->flags= FLAG_KEY_FRAME*key_frame;
170 ft->flags|= FLAG_DATA_SIZE;
171 ft->stream_id_plus1= stream_id + 1;
172 ft->size_mul=1;
173 ft->timestamp_delta=0;
174 start2++;
175 }
176 }
177
178 key_frame= intra_only;
179 #if 1
180 if(is_audio){
181 int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);
182 int pts;
183 for(pts=0; pts<2; pts++){
184 for(pred=0; pred<2; pred++){
185 FrameCode *ft= &nut->frame_code[start2];
186 ft->flags= FLAG_KEY_FRAME*key_frame;
187 ft->stream_id_plus1= stream_id + 1;
188 ft->size_mul=frame_bytes + 2;
189 ft->size_lsb=frame_bytes + pred;
190 ft->timestamp_delta=pts;
191 start2++;
192 }
193 }
194 }else{
195 FrameCode *ft= &nut->frame_code[start2];
196 ft->flags= FLAG_KEY_FRAME | FLAG_DATA_SIZE;
197 ft->stream_id_plus1= stream_id + 1;
198 ft->size_mul=1;
199 ft->timestamp_delta=1;
200 start2++;
201 }
202 #endif
203
204 if(codec->has_b_frames){
205 pred_count=5;
206 pred_table[0]=-2;
207 pred_table[1]=-1;
208 pred_table[2]=1;
209 pred_table[3]=3;
210 pred_table[4]=4;
211 }else if(codec->codec_id == CODEC_ID_VORBIS){
212 pred_count=3;
213 pred_table[0]=2;
214 pred_table[1]=9;
215 pred_table[2]=16;
216 }else{
217 pred_count=1;
218 pred_table[0]=1;
219 }
220
221 for(pred=0; pred<pred_count; pred++){
222 int start3= start2 + (end2-start2)*pred / pred_count;
223 int end3 = start2 + (end2-start2)*(pred+1) / pred_count;
224
225 for(index=start3; index<end3; index++){
226 FrameCode *ft= &nut->frame_code[index];
227 ft->flags= FLAG_KEY_FRAME*key_frame;
228 ft->flags|= FLAG_DATA_SIZE;
229 ft->stream_id_plus1= stream_id + 1;
230 //FIXME use single byte size and pred from last
231 ft->size_mul= end3-start3;
232 ft->size_lsb= index - start3;
233 ft->timestamp_delta= pred_table[pred];
234 }
235 }
236 }
237 memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N'));
238 nut->frame_code['N'].flags= FLAG_INVALID;
239 }
240
241 static uint64_t get_v(ByteIOContext *bc)
242 {
243 uint64_t val = 0;
244
245 for(;;)
246 {
247 int tmp = get_byte(bc);
248
249 if (tmp&0x80)
250 val= (val<<7) + tmp - 0x80;
251 else{
252 //av_log(NULL, AV_LOG_DEBUG, "get_v()= %lld\n", (val<<7) + tmp);
253 return (val<<7) + tmp;
254 }
255 }
256 return -1;
257 }
258
259 static int get_str(ByteIOContext *bc, char *string, unsigned int maxlen){
260 unsigned int len= get_v(bc);
261
262 if(len && maxlen)
263 get_buffer(bc, string, FFMIN(len, maxlen));
264 while(len > maxlen){
265 get_byte(bc);
266 len--;
267 }
268
269 if(maxlen)
270 string[FFMIN(len, maxlen-1)]= 0;
271
272 if(maxlen == len)
273 return -1;
274 else
275 return 0;
276 }
277
278 static int64_t get_s(ByteIOContext *bc){
279 int64_t v = get_v(bc) + 1;
280
281 if (v&1) return -(v>>1);
282 else return (v>>1);
283 }
284
285 static uint64_t get_vb(ByteIOContext *bc){
286 uint64_t val=0;
287 unsigned int i= get_v(bc);
288
289 if(i>8)
290 return UINT64_MAX;
291
292 while(i--)
293 val = (val<<8) + get_byte(bc);
294
295 //av_log(NULL, AV_LOG_DEBUG, "get_vb()= %lld\n", val);
296 return val;
297 }
298
299 #ifdef TRACE
300 static inline uint64_t get_v_trace(ByteIOContext *bc, char *file, char *func, int line){
301 uint64_t v= get_v(bc);
302
303 printf("get_v %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
304 return v;
305 }
306
307 static inline int64_t get_s_trace(ByteIOContext *bc, char *file, char *func, int line){
308 int64_t v= get_s(bc);
309
310 printf("get_s %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
311 return v;
312 }
313
314 static inline uint64_t get_vb_trace(ByteIOContext *bc, char *file, char *func, int line){
315 uint64_t v= get_vb(bc);
316
317 printf("get_vb %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
318 return v;
319 }
320 #define get_v(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
321 #define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
322 #define get_vb(bc) get_vb_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
323 #endif
324
325
326 static int get_packetheader(NUTContext *nut, ByteIOContext *bc, int calculate_checksum)
327 {
328 int64_t start, size;
329 start= url_ftell(bc) - 8;
330
331 size= get_v(bc);
332
333 init_checksum(bc, calculate_checksum ? update_adler32 : NULL, 0);
334
335 nut->packet_start[2] = start;
336 nut->written_packet_size= size;
337
338 return size;
339 }
340
341 static int check_checksum(ByteIOContext *bc){
342 unsigned long checksum= get_checksum(bc);
343 return checksum != get_be32(bc);
344 }
345
346 /**
347 *
348 */
349 static int get_length(uint64_t val){
350 int i;
351
352 for (i=7; val>>i; i+=7);
353
354 return i;
355 }
356
357 static uint64_t find_any_startcode(ByteIOContext *bc, int64_t pos){
358 uint64_t state=0;
359
360 if(pos >= 0)
361 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
362
363 while(!url_feof(bc)){
364 state= (state<<8) | get_byte(bc);
365 if((state>>56) != 'N')
366 continue;
367 switch(state){
368 case MAIN_STARTCODE:
369 case STREAM_STARTCODE:
370 case KEYFRAME_STARTCODE:
371 case INFO_STARTCODE:
372 case INDEX_STARTCODE:
373 return state;
374 }
375 }
376
377 return 0;
378 }
379
380 /**
381 * find the given startcode.
382 * @param code the startcode
383 * @param pos the start position of the search, or -1 if the current position
384 * @returns the position of the startcode or -1 if not found
385 */
386 static int64_t find_startcode(ByteIOContext *bc, uint64_t code, int64_t pos){
387 for(;;){
388 uint64_t startcode= find_any_startcode(bc, pos);
389 if(startcode == code)
390 return url_ftell(bc) - 8;
391 else if(startcode == 0)
392 return -1;
393 pos=-1;
394 }
395 }
396
397 static int64_t lsb2full(StreamContext *stream, int64_t lsb){
398 int64_t mask = (1<<stream->msb_timestamp_shift)-1;
399 int64_t delta= stream->last_pts - mask/2;
400 return ((lsb - delta)&mask) + delta;
401 }
402
403 #ifdef CONFIG_MUXERS
404
405 static void put_v(ByteIOContext *bc, uint64_t val)
406 {
407 int i;
408
409 //av_log(NULL, AV_LOG_DEBUG, "put_v()= %lld\n", val);
410 val &= 0x7FFFFFFFFFFFFFFFULL; // FIXME can only encode upto 63 bits currently
411 i= get_length(val);
412
413 for (i-=7; i>0; i-=7){
414 put_byte(bc, 0x80 | (val>>i));
415 }
416
417 put_byte(bc, val&0x7f);
418 }
419
420 /**
421 * stores a string as vb.
422 */
423 static void put_str(ByteIOContext *bc, const char *string){
424 int len= strlen(string);
425
426 put_v(bc, len);
427 put_buffer(bc, string, len);
428 }
429
430 static void put_s(ByteIOContext *bc, int64_t val){
431 if (val<=0) put_v(bc, -2*val );
432 else put_v(bc, 2*val-1);
433 }
434
435 static void put_vb(ByteIOContext *bc, uint64_t val){
436 int i;
437
438 for (i=8; val>>i; i+=8);
439
440 put_v(bc, i>>3);
441 for(i-=8; i>=0; i-=8)
442 put_byte(bc, (val>>i)&0xFF);
443 }
444
445 #ifdef TRACE
446 static inline void put_v_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
447 printf("get_v %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
448
449 put_v(bc, v);
450 }
451
452 static inline void put_s_trace(ByteIOContext *bc, int64_t v, char *file, char *func, int line){
453 printf("get_s %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
454
455 put_s(bc, v);
456 }
457
458 static inline void put_vb_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
459 printf("get_vb %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
460
461 put_vb(bc, v);
462 }
463 #define put_v(bc, v) put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
464 #define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
465 #define put_vb(bc, v) put_vb_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
466 #endif
467
468 static int put_packetheader(NUTContext *nut, ByteIOContext *bc, int max_size, int calculate_checksum)
469 {
470 put_flush_packet(bc);
471 nut->packet_start[2]= url_ftell(bc) - 8;
472 nut->written_packet_size = max_size;
473
474 /* packet header */
475 put_v(bc, nut->written_packet_size); /* forward ptr */
476
477 if(calculate_checksum)
478 init_checksum(bc, update_adler32, 0);
479
480 return 0;
481 }
482
483 /**
484 *
485 * must not be called more then once per packet
486 */
487 static int update_packetheader(NUTContext *nut, ByteIOContext *bc, int additional_size, int calculate_checksum){
488 int64_t start= nut->packet_start[2];
489 int64_t cur= url_ftell(bc);
490 int size= cur - start - get_length(nut->written_packet_size)/7 - 8;
491
492 if(calculate_checksum)
493 size += 4;
494
495 if(size != nut->written_packet_size){
496 int i;
497
498 assert( size <= nut->written_packet_size );
499
500 url_fseek(bc, start + 8, SEEK_SET);
501 for(i=get_length(size); i < get_length(nut->written_packet_size); i+=7)
502 put_byte(bc, 0x80);
503 put_v(bc, size);
504
505 url_fseek(bc, cur, SEEK_SET);
506 nut->written_packet_size= size; //FIXME may fail if multiple updates with differing sizes, as get_length may differ
507
508 if(calculate_checksum)
509 put_be32(bc, get_checksum(bc));
510 }
511
512 return 0;
513 }
514
515 static int nut_write_header(AVFormatContext *s)
516 {
517 NUTContext *nut = s->priv_data;
518 ByteIOContext *bc = &s->pb;
519 AVCodecContext *codec;
520 int i, j, tmp_time, tmp_flags,tmp_stream, tmp_mul, tmp_size, tmp_fields;
521
522 if (strcmp(s->filename, "./data/b-libav.nut")) {
523 av_log(s, AV_LOG_ERROR, " libavformat NUT is non-compliant and disabled\n");
524 return -1;
525 }
526
527 nut->avf= s;
528
529 nut->stream =
530 av_mallocz(sizeof(StreamContext)*s->nb_streams);
531
532
533 put_buffer(bc, ID_STRING, strlen(ID_STRING));
534 put_byte(bc, 0);
535 nut->packet_start[2]= url_ftell(bc);
536
537 /* main header */
538 put_be64(bc, MAIN_STARTCODE);
539 put_packetheader(nut, bc, 120+5*256, 1);
540 put_v(bc, 2); /* version */
541 put_v(bc, s->nb_streams);
542 put_v(bc, MAX_DISTANCE);
543 put_v(bc, MAX_SHORT_DISTANCE);
544
545 put_v(bc, nut->rate_num=1);
546 put_v(bc, nut->rate_den=2);
547 put_v(bc, nut->short_startcode=0x4EFE79);
548
549 build_frame_code(s);
550 assert(nut->frame_code['N'].flags == FLAG_INVALID);
551
552 tmp_time= tmp_flags= tmp_stream= tmp_mul= tmp_size= /*tmp_res=*/ INT_MAX;
553 for(i=0; i<256;){
554 tmp_fields=0;
555 tmp_size= 0;
556 if(tmp_time != nut->frame_code[i].timestamp_delta) tmp_fields=1;
557 if(tmp_mul != nut->frame_code[i].size_mul ) tmp_fields=2;
558 if(tmp_stream != nut->frame_code[i].stream_id_plus1) tmp_fields=3;
559 if(tmp_size != nut->frame_code[i].size_lsb ) tmp_fields=4;
560 // if(tmp_res != nut->frame_code[i].res ) tmp_fields=5;
561
562 tmp_time = nut->frame_code[i].timestamp_delta;
563 tmp_flags = nut->frame_code[i].flags;
564 tmp_stream= nut->frame_code[i].stream_id_plus1;
565 tmp_mul = nut->frame_code[i].size_mul;
566 tmp_size = nut->frame_code[i].size_lsb;
567 // tmp_res = nut->frame_code[i].res;
568
569 for(j=0; i<256; j++,i++){
570 if(nut->frame_code[i].timestamp_delta != tmp_time ) break;
571 if(nut->frame_code[i].flags != tmp_flags ) break;
572 if(nut->frame_code[i].stream_id_plus1 != tmp_stream) break;
573 if(nut->frame_code[i].size_mul != tmp_mul ) break;
574 if(nut->frame_code[i].size_lsb != tmp_size+j) break;
575 // if(nut->frame_code[i].res != tmp_res ) break;
576 }
577 if(j != tmp_mul - tmp_size) tmp_fields=6;
578
579 put_v(bc, tmp_flags);
580 put_v(bc, tmp_fields);
581 if(tmp_fields>0) put_s(bc, tmp_time);
582 if(tmp_fields>1) put_v(bc, tmp_mul);
583 if(tmp_fields>2) put_v(bc, tmp_stream);
584 if(tmp_fields>3) put_v(bc, tmp_size);
585 if(tmp_fields>4) put_v(bc, 0 /*tmp_res*/);
586 if(tmp_fields>5) put_v(bc, j);
587 }
588
589 update_packetheader(nut, bc, 0, 1);
590
591 /* stream headers */
592 for (i = 0; i < s->nb_streams; i++)
593 {
594 int nom, denom, ssize;
595
596 codec = s->streams[i]->codec;
597
598 put_be64(bc, STREAM_STARTCODE);
599 put_packetheader(nut, bc, 120 + codec->extradata_size, 1);
600 put_v(bc, i /*s->streams[i]->index*/);
601 switch(codec->codec_type){
602 case CODEC_TYPE_VIDEO: put_v(bc, 0); break;
603 case CODEC_TYPE_AUDIO: put_v(bc, 1); break;
604 // case CODEC_TYPE_TEXT : put_v(bc, 2); break;
605 case CODEC_TYPE_DATA : put_v(bc, 3); break;
606 default: return -1;
607 }
608 if (codec->codec_tag)
609 put_vb(bc, codec->codec_tag);
610 else if (codec->codec_type == CODEC_TYPE_VIDEO)
611 {
612 put_vb(bc, codec_get_bmp_tag(codec->codec_id));
613 }
614 else if (codec->codec_type == CODEC_TYPE_AUDIO)
615 {
616 put_vb(bc, codec_get_wav_tag(codec->codec_id));
617 }
618 else
619 put_vb(bc, 0);
620
621 ff_parse_specific_params(codec, &nom, &ssize, &denom);
622
623 nut->stream[i].rate_num= nom;
624 nut->stream[i].rate_den= denom;
625 av_set_pts_info(s->streams[i], 60, denom, nom);
626
627 put_v(bc, codec->bit_rate);
628 put_vb(bc, 0); /* no language code */
629 put_v(bc, nom);
630 put_v(bc, denom);
631 if(nom / denom < 1000)
632 nut->stream[i].msb_timestamp_shift = 7;
633 else
634 nut->stream[i].msb_timestamp_shift = 14;
635 put_v(bc, nut->stream[i].msb_timestamp_shift);
636 put_v(bc, codec->has_b_frames);
637 put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
638
639 if(codec->extradata_size){
640 put_v(bc, 1);
641 put_v(bc, codec->extradata_size);
642 put_buffer(bc, codec->extradata, codec->extradata_size);
643 }
644 put_v(bc, 0); /* end of codec specific headers */
645
646 switch(codec->codec_type)
647 {
648 case CODEC_TYPE_AUDIO:
649 put_v(bc, codec->sample_rate);
650 put_v(bc, 1);
651 put_v(bc, codec->channels);
652 break;
653 case CODEC_TYPE_VIDEO:
654 put_v(bc, codec->width);
655 put_v(bc, codec->height);
656 put_v(bc, codec->sample_aspect_ratio.num);
657 put_v(bc, codec->sample_aspect_ratio.den);
658 put_v(bc, 0); /* csp type -- unknown */
659 break;
660 default:
661 break;
662 }
663 update_packetheader(nut, bc, 0, 1);
664 }
665
666 /* info header */
667 put_be64(bc, INFO_STARTCODE);
668 put_packetheader(nut, bc, 30+strlen(s->author)+strlen(s->title)+
669 strlen(s->comment)+strlen(s->copyright)+strlen(LIBAVFORMAT_IDENT), 1);
670 if (s->author[0])
671 {
672 put_v(bc, 9); /* type */
673 put_str(bc, s->author);
674 }
675 if (s->title[0])
676 {
677 put_v(bc, 10); /* type */
678 put_str(bc, s->title);
679 }
680 if (s->comment[0])
681 {
682 put_v(bc, 11); /* type */
683 put_str(bc, s->comment);
684 }
685 if (s->copyright[0])
686 {
687 put_v(bc, 12); /* type */
688 put_str(bc, s->copyright);
689 }
690 /* encoder */
691 if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)){
692 put_v(bc, 13); /* type */
693 put_str(bc, LIBAVFORMAT_IDENT);
694 }
695
696 put_v(bc, 0); /* eof info */
697 update_packetheader(nut, bc, 0, 1);
698
699 put_flush_packet(bc);
700
701 return 0;
702 }
703
704 static int nut_write_packet(AVFormatContext *s, AVPacket *pkt)
705 {
706 NUTContext *nut = s->priv_data;
707 StreamContext *stream= &nut->stream[pkt->stream_index];
708 ByteIOContext *bc = &s->pb;
709 int key_frame = 0, full_pts=0;
710 AVCodecContext *enc;
711 int64_t coded_pts;
712 int frame_type, best_length, frame_code, flags, i, size_mul, size_lsb, time_delta;
713 const int64_t frame_start= url_ftell(bc);
714 int64_t pts= pkt->pts;
715 int size= pkt->size;
716 int stream_index= pkt->stream_index;
717
718 enc = s->streams[stream_index]->codec;
719 key_frame = !!(pkt->flags & PKT_FLAG_KEY);
720
721 frame_type=0;
722 if(frame_start + size + 20 - FFMAX(nut->packet_start[1], nut->packet_start[2]) > MAX_DISTANCE)
723 frame_type=2;
724 if(key_frame && !stream->last_key_frame)
725 frame_type=2;
726
727 if(frame_type>1){
728 int64_t global_ts= av_rescale(pts, stream->rate_den*(int64_t)nut->rate_num, stream->rate_num*(int64_t)nut->rate_den);
729 reset(s, global_ts);
730 put_be64(bc, KEYFRAME_STARTCODE);
731 put_v(bc, global_ts);
732 }
733 assert(stream->last_pts != AV_NOPTS_VALUE);
734 coded_pts = pts & ((1<<stream->msb_timestamp_shift)-1);
735 if(lsb2full(stream, coded_pts) != pts)
736 full_pts=1;
737
738 if(full_pts)
739 coded_pts= pts + (1<<stream->msb_timestamp_shift);
740
741 best_length=INT_MAX;
742 frame_code= -1;
743 for(i=0; i<256; i++){
744 int stream_id_plus1= nut->frame_code[i].stream_id_plus1;
745 int fc_key_frame;
746 int length=0;
747 size_mul= nut->frame_code[i].size_mul;
748 size_lsb= nut->frame_code[i].size_lsb;
749 time_delta= nut->frame_code[i].timestamp_delta;
750 flags= nut->frame_code[i].flags;
751
752 assert(size_mul > size_lsb);
753
754 if(stream_id_plus1 == 0) length+= get_length(stream_index);
755 else if(stream_id_plus1 - 1 != stream_index)
756 continue;
757 fc_key_frame= !!(flags & FLAG_KEY_FRAME);
758
759 assert(key_frame==0 || key_frame==1);
760 if(fc_key_frame != key_frame)
761 continue;
762
763 if(flags & FLAG_DATA_SIZE){
764 if(size % size_mul != size_lsb)
765 continue;
766 length += get_length(size / size_mul);
767 }else if(size != size_lsb)
768 continue;
769
770 if(full_pts && time_delta)
771 continue;
772
773 if(!time_delta){
774 length += get_length(coded_pts);
775 }else{
776 if(time_delta != pts - stream->last_pts)
777 continue;
778 }
779
780 if(length < best_length){
781 best_length= length;
782 frame_code=i;
783 }
784 // av_log(s, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d %d %d\n", key_frame, frame_type, full_pts, size, stream_index, flags, size_mul, size_lsb, stream_id_plus1, length);
785 }
786
787 assert(frame_code != -1);
788 flags= nut->frame_code[frame_code].flags;
789 size_mul= nut->frame_code[frame_code].size_mul;
790 size_lsb= nut->frame_code[frame_code].size_lsb;
791 time_delta= nut->frame_code[frame_code].timestamp_delta;
792 #ifdef TRACE
793 best_length /= 7;
794 best_length ++; //frame_code
795 if(frame_type==2){
796 best_length += 8; // startcode
797 }
798 av_log(s, AV_LOG_DEBUG, "kf:%d ft:%d pt:%d fc:%2X len:%2d size:%d stream:%d flag:%d mul:%d lsb:%d s+1:%d pts_delta:%d pts:%lld fs:%lld\n", key_frame, frame_type, full_pts ? 1 : 0, frame_code, best_length, size, stream_index, flags, size_mul, size_lsb, nut->frame_code[frame_code].stream_id_plus1,(int)(pts - stream->last_pts), pts, frame_start);
799 // av_log(s, AV_LOG_DEBUG, "%d %d %d\n", stream->lru_pts_delta[0], stream->lru_pts_delta[1], stream->lru_pts_delta[2]);
800 #endif
801
802 assert(frame_type != 1); //short startcode not implemented yet
803 put_byte(bc, frame_code);
804
805 if(nut->frame_code[frame_code].stream_id_plus1 == 0)
806 put_v(bc, stream_index);
807 if (!time_delta){
808 put_v(bc, coded_pts);
809 }
810 if(flags & FLAG_DATA_SIZE)
811 put_v(bc, size / size_mul);
812 else
813 assert(size == size_lsb);
814 if(size > MAX_DISTANCE){
815 assert(frame_type > 1);
816 }
817
818 put_buffer(bc, pkt->data, size);
819
820 update(nut, stream_index, frame_start, frame_type, frame_code, key_frame, size, pts);
821
822 return 0;
823 }
824
825 static int nut_write_trailer(AVFormatContext *s)
826 {
827 NUTContext *nut = s->priv_data;
828 ByteIOContext *bc = &s->pb;
829
830 #if 0
831 int i;
832
833 /* WRITE INDEX */
834
835 for (i = 0; s->nb_streams; i++)
836 {
837 put_be64(bc, INDEX_STARTCODE);
838 put_packetheader(nut, bc, 64, 1);
839 put_v(bc, s->streams[i]->id);
840 put_v(bc, ...);
841 update_packetheader(nut, bc, 0, 1);
842 }
843 #endif
844
845 put_flush_packet(bc);
846
847 av_freep(&nut->stream);
848
849 return 0;
850 }
851 #endif //CONFIG_MUXERS
852
853 static int nut_probe(AVProbeData *p)
854 {
855 int i;
856 uint64_t code= 0xff;
857
858 for (i = 0; i < p->buf_size; i++) {
859 code = (code << 8) | p->buf[i];
860 if (code == MAIN_STARTCODE)
861 return AVPROBE_SCORE_MAX;
862 }
863 return 0;
864 }
865
866 static int decode_main_header(NUTContext *nut){
867 AVFormatContext *s= nut->avf;
868 ByteIOContext *bc = &s->pb;
869 uint64_t tmp;
870 int i, j, tmp_stream, tmp_mul, tmp_time, tmp_size, count, tmp_res;
871
872 get_packetheader(nut, bc, 1);
873
874 tmp = get_v(bc);
875 if (tmp != 2){
876 av_log(s, AV_LOG_ERROR, "bad version (%"PRId64")\n", tmp);
877 return -1;
878 }
879
880 nut->stream_count = get_v(bc);
881 if(nut->stream_count > MAX_STREAMS){
882 av_log(s, AV_LOG_ERROR, "too many streams\n");
883 return -1;
884 }
885 nut->max_distance = get_v(bc);
886 nut->max_short_distance = get_v(bc);
887 nut->rate_num= get_v(bc);
888 nut->rate_den= get_v(bc);
889 nut->short_startcode= get_v(bc);
890 if(nut->short_startcode>>16 != 'N'){
891 av_log(s, AV_LOG_ERROR, "invalid short startcode %X\n", nut->short_startcode);
892 return -1;
893 }
894
895 for(i=0; i<256;){
896 int tmp_flags = get_v(bc);
897 int tmp_fields= get_v(bc);
898 if(tmp_fields>0) tmp_time = get_s(bc);
899 if(tmp_fields>1) tmp_mul = get_v(bc);
900 if(tmp_fields>2) tmp_stream= get_v(bc);
901 if(tmp_fields>3) tmp_size = get_v(bc);
902 else tmp_size = 0;
903 if(tmp_fields>4) tmp_res = get_v(bc);
904 else tmp_res = 0;
905 if(tmp_fields>5) count = get_v(bc);
906 else count = tmp_mul - tmp_size;
907
908 while(tmp_fields-- > 6)
909 get_v(bc);
910
911 if(count == 0 || i+count > 256){
912 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
913 return -1;
914 }
915 if(tmp_stream > nut->stream_count + 1){
916 av_log(s, AV_LOG_ERROR, "illegal stream number\n");
917 return -1;
918 }
919
920 for(j=0; j<count; j++,i++){
921 nut->frame_code[i].flags = tmp_flags ;
922 nut->frame_code[i].timestamp_delta = tmp_time ;
923 nut->frame_code[i].stream_id_plus1 = tmp_stream;
924 nut->frame_code[i].size_mul = tmp_mul ;
925 nut->frame_code[i].size_lsb = tmp_size+j;
926 nut->frame_code[i].reserved_count = tmp_res ;
927 }
928 }
929 if(nut->frame_code['N'].flags != FLAG_INVALID){
930 av_log(s, AV_LOG_ERROR, "illegal frame_code table\n");
931 return -1;
932 }
933
934 if(check_checksum(bc)){
935 av_log(s, AV_LOG_ERROR, "Main header checksum mismatch\n");
936 return -1;
937 }
938
939 return 0;
940 }
941
942 static int decode_stream_header(NUTContext *nut){
943 AVFormatContext *s= nut->avf;
944 ByteIOContext *bc = &s->pb;
945 int class, nom, denom, stream_id;
946 uint64_t tmp;
947 AVStream *st;
948
949 get_packetheader(nut, bc, 1);
950 stream_id= get_v(bc);
951 if(stream_id >= nut->stream_count || s->streams[stream_id])
952 return -1;
953
954 st = av_new_stream(s, stream_id);
955 if (!st)
956 return AVERROR_NOMEM;
957
958 class = get_v(bc);
959 tmp = get_vb(bc);
960 st->codec->codec_tag= tmp;
961 switch(class)
962 {
963 case 0:
964 st->codec->codec_type = CODEC_TYPE_VIDEO;
965 st->codec->codec_id = codec_get_bmp_id(tmp);
966 if (st->codec->codec_id == CODEC_ID_NONE)
967 av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
968 break;
969 case 1:
970 case 32: //compatibility
971 st->codec->codec_type = CODEC_TYPE_AUDIO;
972 st->codec->codec_id = codec_get_wav_id(tmp);
973 if (st->codec->codec_id == CODEC_ID_NONE)
974 av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
975 break;
976 case 2:
977 // st->codec->codec_type = CODEC_TYPE_TEXT;
978 // break;
979 case 3:
980 st->codec->codec_type = CODEC_TYPE_DATA;
981 break;
982 default:
983 av_log(s, AV_LOG_ERROR, "Unknown stream class (%d)\n", class);
984 return -1;
985 }
986 s->bit_rate += get_v(bc);
987 get_vb(bc); /* language code */
988 nom = get_v(bc);
989 denom = get_v(bc);
990 nut->stream[stream_id].msb_timestamp_shift = get_v(bc);
991 st->codec->has_b_frames=
992 nut->stream[stream_id].decode_delay= get_v(bc);
993 get_byte(bc); /* flags */
994
995 /* codec specific data headers */
996 while(get_v(bc) != 0){
997 st->codec->extradata_size= get_v(bc);
998 if((unsigned)st->codec->extradata_size > (1<<30))
999 return -1;
1000 st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
1001 get_buffer(bc, st->codec->extradata, st->codec->extradata_size);
1002 // url_fskip(bc, get_v(bc));
1003 }
1004
1005 if (st->codec->codec_type == CODEC_TYPE_VIDEO) /* VIDEO */
1006 {
1007 st->codec->width = get_v(bc);
1008 st->codec->height = get_v(bc);
1009 st->codec->sample_aspect_ratio.num= get_v(bc);
1010 st->codec->sample_aspect_ratio.den= get_v(bc);
1011 get_v(bc); /* csp type */
1012 }
1013 if (st->codec->codec_type == CODEC_TYPE_AUDIO) /* AUDIO */
1014 {
1015 st->codec->sample_rate = get_v(bc);
1016 get_v(bc); // samplerate_den
1017 st->codec->channels = get_v(bc);
1018 }
1019 if(check_checksum(bc)){
1020 av_log(s, AV_LOG_ERROR, "Stream header %d checksum mismatch\n", stream_id);
1021 return -1;
1022 }
1023 av_set_pts_info(s->streams[stream_id], 60, denom, nom);
1024 nut->stream[stream_id].rate_num= nom;
1025 nut->stream[stream_id].rate_den= denom;
1026 return 0;
1027 }
1028
1029 static int decode_info_header(NUTContext *nut){
1030 AVFormatContext *s= nut->avf;
1031 ByteIOContext *bc = &s->pb;
1032
1033 get_packetheader(nut, bc, 1);
1034
1035 for(;;){
1036 int id= get_v(bc);
1037 char *name, *type, custom_name[256], custom_type[256];
1038
1039 if(!id)
1040 break;
1041 else if(id >= sizeof(info_table)/sizeof(info_table[0])){
1042 av_log(s, AV_LOG_ERROR, "info id is too large %d %zd\n", id, sizeof(info_table)/sizeof(info_table[0]));
1043 return -1;
1044 }
1045
1046 type= info_table[id][1];
1047 name= info_table[id][0];
1048 //av_log(s, AV_LOG_DEBUG, "%d %s %s\n", id, type, name);
1049
1050 if(!type){
1051 get_str(bc, custom_type, sizeof(custom_type));
1052 type= custom_type;
1053 }
1054 if(!name){
1055 get_str(bc, custom_name, sizeof(custom_name));
1056 name= custom_name;
1057 }
1058
1059 if(!strcmp(type, "v")){
1060 get_v(bc);
1061 }else{
1062 if(!strcmp(name, "Author"))
1063 get_str(bc, s->author, sizeof(s->author));
1064 else if(!strcmp(name, "Title"))
1065 get_str(bc, s->title, sizeof(s->title));
1066 else if(!strcmp(name, "Copyright"))
1067 get_str(bc, s->copyright, sizeof(s->copyright));
1068 else if(!strcmp(name, "Description"))
1069 get_str(bc, s->comment, sizeof(s->comment));
1070 else
1071 get_str(bc, NULL, 0);
1072 }
1073 }
1074 if(check_checksum(bc)){
1075 av_log(s, AV_LOG_ERROR, "Info header checksum mismatch\n");
1076 return -1;
1077 }
1078 return 0;
1079 }
1080
1081 static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
1082 {
1083 NUTContext *nut = s->priv_data;
1084 ByteIOContext *bc = &s->pb;
1085 int64_t pos;
1086 int inited_stream_count;
1087
1088 nut->avf= s;
1089
1090 /* main header */
1091 pos=0;
1092 for(;;){
1093 pos= find_startcode(bc, MAIN_STARTCODE, pos)+1;
1094 if (pos<0){
1095 av_log(s, AV_LOG_ERROR, "no main startcode found\n");
1096 return -1;
1097 }
1098 if(decode_main_header(nut) >= 0)
1099 break;
1100 }
1101
1102
1103 s->bit_rate = 0;
1104
1105 nut->stream = av_malloc(sizeof(StreamContext)*nut->stream_count);
1106
1107 /* stream headers */
1108 pos=0;
1109 for(inited_stream_count=0; inited_stream_count < nut->stream_count;){
1110 pos= find_startcode(bc, STREAM_STARTCODE, pos)+1;
1111 if (pos<0+1){
1112 av_log(s, AV_LOG_ERROR, "not all stream headers found\n");
1113 return -1;
1114 }
1115 if(decode_stream_header(nut) >= 0)
1116 inited_stream_count++;
1117 }
1118
1119 /* info headers */
1120 pos=0;
1121 for(;;){
1122 uint64_t startcode= find_any_startcode(bc, pos);
1123 pos= url_ftell(bc);
1124
1125 if(startcode==0){
1126 av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
1127 return -1;
1128 }else if(startcode == KEYFRAME_STARTCODE){
1129 nut->next_startcode= startcode;
1130 break;
1131 }else if(startcode != INFO_STARTCODE){
1132 continue;
1133 }
1134
1135 decode_info_header(nut);
1136 }
1137
1138 return 0;
1139 }
1140
1141 static int decode_frame_header(NUTContext *nut, int *key_frame_ret, int64_t *pts_ret, int *stream_id_ret, int frame_code, int frame_type, int64_t frame_start){
1142 AVFormatContext *s= nut->avf;
1143 StreamContext *stream;
1144 ByteIOContext *bc = &s->pb;
1145 int size, flags, size_mul, size_lsb, stream_id, time_delta;
1146 int64_t pts = 0;
1147
1148 if(frame_type < 2 && frame_start - nut->packet_start[2] > nut->max_distance){
1149 av_log(s, AV_LOG_ERROR, "last frame must have been damaged\n");
1150 return -1;
1151 }
1152
1153 if(frame_type)
1154 nut->packet_start[ frame_type ]= frame_start; //otherwise 1 goto 1 may happen
1155
1156 flags= nut->frame_code[frame_code].flags;
1157 size_mul= nut->frame_code[frame_code].size_mul;
1158 size_lsb= nut->frame_code[frame_code].size_lsb;
1159 stream_id= nut->frame_code[frame_code].stream_id_plus1 - 1;
1160 time_delta= nut->frame_code[frame_code].timestamp_delta;
1161
1162 if(stream_id==-1)
1163 stream_id= get_v(bc);
1164 if(stream_id >= s->nb_streams){
1165 av_log(s, AV_LOG_ERROR, "illegal stream_id\n");
1166 return -1;
1167 }
1168 stream= &nut->stream[stream_id];
1169
1170 // av_log(s, AV_LOG_DEBUG, "ft:%d ppts:%d %d %d\n", frame_type, stream->lru_pts_delta[0], stream->lru_pts_delta[1], stream->lru_pts_delta[2]);
1171
1172 *key_frame_ret= !!(flags & FLAG_KEY_FRAME);
1173
1174 if(!time_delta){
1175 int64_t mask = (1<<stream->msb_timestamp_shift)-1;
1176 pts= get_v(bc);
1177 if(pts > mask){
1178 pts -= mask+1;
1179 }else{
1180 if(stream->last_pts == AV_NOPTS_VALUE){
1181 av_log(s, AV_LOG_ERROR, "no reference pts available\n");
1182 return -1;
1183 }
1184 pts= lsb2full(stream, pts);
1185 }
1186 }else{
1187 if(stream->last_pts == AV_NOPTS_VALUE){
1188 av_log(s, AV_LOG_ERROR, "no reference pts available\n");
1189 return -1;
1190 }
1191 pts= stream->last_pts + time_delta;
1192 }
1193
1194 if(*key_frame_ret){
1195 // av_log(s, AV_LOG_DEBUG, "stream:%d start:%lld pts:%lld length:%lld\n",stream_id, frame_start, av_pts, frame_start - nut->stream[stream_id].last_sync_pos);
1196 av_add_index_entry(
1197 s->streams[stream_id],
1198 frame_start,
1199 pts,
1200 0,
1201 frame_start - nut->stream[stream_id].last_sync_pos,
1202 AVINDEX_KEYFRAME);
1203 nut->stream[stream_id].last_sync_pos= frame_start;
1204 // assert(nut->packet_start == frame_start);
1205 }
1206
1207 assert(size_mul > size_lsb);
1208 size= size_lsb;
1209 if(flags & FLAG_DATA_SIZE)
1210 size+= size_mul*get_v(bc);
1211
1212 #ifdef TRACE
1213 av_log(s, AV_LOG_DEBUG, "fs:%lld fc:%d ft:%d kf:%d pts:%lld size:%d mul:%d lsb:%d flags:%d delta:%d\n", frame_start, frame_code, frame_type, *key_frame_ret, pts, size, size_mul, size_lsb, flags, time_delta);
1214 #endif
1215
1216 if(frame_type==0 && url_ftell(bc) - nut->packet_start[2] + size > nut->max_distance){
1217 av_log(s, AV_LOG_ERROR, "frame size too large\n");
1218 return -1;
1219 }
1220
1221 *stream_id_ret = stream_id;
1222 *pts_ret = pts;
1223
1224 update(nut, stream_id, frame_start, frame_type, frame_code, *key_frame_ret, size, pts);
1225
1226 return size;
1227 }
1228
1229 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code, int frame_type, int64_t frame_start){
1230 AVFormatContext *s= nut->avf;
1231 ByteIOContext *bc = &s->pb;
1232 int size, stream_id, key_frame, discard;
1233 int64_t pts, last_IP_pts;
1234
1235 size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type, frame_start);
1236 if(size < 0)
1237 return -1;
1238
1239 discard= s->streams[ stream_id ]->discard;
1240 last_IP_pts= s->streams[ stream_id ]->last_IP_pts;
1241 if( (discard >= AVDISCARD_NONKEY && !key_frame)
1242 ||(discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE && last_IP_pts > pts)
1243 || discard >= AVDISCARD_ALL){
1244 url_fskip(bc, size);
1245 return 1;
1246 }
1247
1248 av_get_packet(bc, pkt, size);
1249 pkt->stream_index = stream_id;
1250 if (key_frame)
1251 pkt->flags |= PKT_FLAG_KEY;
1252 pkt->pts = pts;
1253
1254 return 0;
1255 }
1256
1257 static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
1258 {
1259 NUTContext *nut = s->priv_data;
1260 ByteIOContext *bc = &s->pb;
1261 int i, frame_code=0, ret;
1262
1263 for(;;){
1264 int64_t pos= url_ftell(bc);
1265 int frame_type= 0;
1266 uint64_t tmp= nut->next_startcode;
1267 nut->next_startcode=0;
1268
1269 if (url_feof(bc))
1270 return -1;
1271
1272 if(tmp){
1273 pos-=8;
1274 }else{
1275 frame_code = get_byte(bc);
1276 if(frame_code == 'N'){
1277 tmp= frame_code;
1278 for(i=1; i<8; i++)
1279 tmp = (tmp<<8) + get_byte(bc);
1280 }
1281 }
1282 switch(tmp){
1283 case MAIN_STARTCODE:
1284 case STREAM_STARTCODE:
1285 case INDEX_STARTCODE:
1286 get_packetheader(nut, bc, 0);
1287 assert(nut->packet_start[2] == pos);
1288 url_fseek(bc, nut->written_packet_size, SEEK_CUR);
1289 break;
1290 case INFO_STARTCODE:
1291 if(decode_info_header(nut)<0)
1292 goto resync;
1293 break;
1294 case KEYFRAME_STARTCODE:
1295 frame_type = 2;
1296 reset(s, get_v(bc));
1297 frame_code = get_byte(bc);
1298 case 0:
1299 ret= decode_frame(nut, pkt, frame_code, frame_type, pos);
1300 if(ret==0)
1301 return 0;
1302 else if(ret==1) //ok but discard packet
1303 break;
1304 default:
1305 resync:
1306 av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", nut->packet_start[2]+1);
1307 tmp= find_any_startcode(bc, nut->packet_start[2]+1);
1308 if(tmp==0)
1309 return -1;
1310 av_log(s, AV_LOG_DEBUG, "sync\n");
1311 nut->next_startcode= tmp;
1312 }
1313 }
1314 }
1315
1316 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos_arg, int64_t pos_limit){
1317 NUTContext *nut = s->priv_data;
1318 StreamContext *stream;
1319 ByteIOContext *bc = &s->pb;
1320 int64_t pos, pts;
1321 uint64_t code;
1322 int frame_code,step, stream_id, i,size, key_frame;
1323 av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n", stream_index, *pos_arg, pos_limit);
1324
1325 if(*pos_arg < 0)
1326 return AV_NOPTS_VALUE;
1327
1328 pos= *pos_arg;
1329 step= FFMIN(16*1024, pos);
1330 do{
1331 pos-= step;
1332 code= find_any_startcode(bc, pos);
1333
1334 if(code && url_ftell(bc) - 8 <= *pos_arg)
1335 break;
1336 step= FFMIN(2*step, pos);
1337 }while(step);
1338
1339 if(!code) //nothing found, not even after pos_arg
1340 return AV_NOPTS_VALUE;
1341
1342 url_fseek(bc, -8, SEEK_CUR);
1343 for(i=0; i<s->nb_streams; i++)
1344 nut->stream[i].last_sync_pos= url_ftell(bc);
1345
1346 for(;;){
1347 int frame_type=0;
1348 int64_t pos= url_ftell(bc);
1349 uint64_t tmp=0;
1350
1351 if(pos > pos_limit || url_feof(bc))
1352 return AV_NOPTS_VALUE;
1353
1354 frame_code = get_byte(bc);
1355 if(frame_code == 'N'){
1356 tmp= frame_code;
1357 for(i=1; i<8; i++)
1358 tmp = (tmp<<8) + get_byte(bc);
1359 }
1360 //av_log(s, AV_LOG_DEBUG, "before switch %llX at=%lld\n", tmp, pos);
1361
1362 switch(tmp){
1363 case MAIN_STARTCODE:
1364 case STREAM_STARTCODE:
1365 case INDEX_STARTCODE:
1366 case INFO_STARTCODE:
1367 get_packetheader(nut, bc, 0);
1368 assert(nut->packet_start[2]==pos);
1369 url_fseek(bc, nut->written_packet_size, SEEK_CUR);
1370 break;
1371 case KEYFRAME_STARTCODE:
1372 frame_type=2;
1373 reset(s, get_v(bc));
1374 frame_code = get_byte(bc);
1375 case 0:
1376 size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type, pos);
1377 if(size < 0)
1378 goto resync;
1379
1380 stream= &nut->stream[stream_id];
1381 if(stream_id != stream_index || !key_frame || pos < *pos_arg){
1382 url_fseek(bc, size, SEEK_CUR);
1383 break;
1384 }
1385
1386 *pos_arg= pos;
1387 return pts;
1388 default:
1389 resync:
1390 av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", nut->packet_start[2]+1);
1391 if(!find_any_startcode(bc, nut->packet_start[2]+1))
1392 return AV_NOPTS_VALUE;
1393
1394 url_fseek(bc, -8, SEEK_CUR);
1395 }
1396 }
1397 return AV_NOPTS_VALUE;
1398 }
1399
1400 static int nut_read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1401 // NUTContext *nut = s->priv_data;
1402 int64_t pos;
1403
1404 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1405 return -1;
1406
1407 pos= url_ftell(&s->pb);
1408 nut_read_timestamp(s, stream_index, &pos, pos-1);
1409
1410 return 0;
1411 }
1412
1413 static int nut_read_close(AVFormatContext *s)
1414 {
1415 NUTContext *nut = s->priv_data;
1416 int i;
1417
1418 for(i=0;i<s->nb_streams;i++) {
1419 av_freep(&s->streams[i]->codec->extradata);
1420 }
1421 av_freep(&nut->stream);
1422
1423 return 0;
1424 }
1425
1426 static AVInputFormat nut_iformat = {
1427 "nut",
1428 "nut format",
1429 sizeof(NUTContext),
1430 nut_probe,
1431 nut_read_header,
1432 nut_read_packet,
1433 nut_read_close,
1434 nut_read_seek,
1435 nut_read_timestamp,
1436 .extensions = "nut",
1437 };
1438
1439 #ifdef CONFIG_MUXERS
1440 static AVOutputFormat nut_oformat = {
1441 "nut",
1442 "nut format",
1443 "video/x-nut",
1444 "nut",
1445 sizeof(NUTContext),
1446 #ifdef CONFIG_LIBVORBIS
1447 CODEC_ID_VORBIS,
1448 #elif defined(CONFIG_MP3LAME)
1449 CODEC_ID_MP3,
1450 #else
1451 CODEC_ID_MP2, /* AC3 needs liba52 decoder */
1452 #endif
1453 CODEC_ID_MPEG4,
1454 nut_write_header,
1455 nut_write_packet,
1456 nut_write_trailer,
1457 .flags = AVFMT_GLOBALHEADER,
1458 };
1459 #endif //CONFIG_MUXERS
1460
1461 int nut_init(void)
1462 {
1463 av_register_input_format(&nut_iformat);
1464 #ifdef CONFIG_MUXERS
1465 av_register_output_format(&nut_oformat);
1466 #endif //CONFIG_MUXERS
1467 return 0;
1468 }