nut.c@ 7692

Last change on this file since 7692 was 5776, checked in by vboxsync, 17 years ago
ffmpeg: exported to OSE
File size: 42.6 KB

Line
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 / (8codec->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
1417	av_freep(&nut->stream);
1418
1419	return 0;
1420	}
1421
1422	static AVInputFormat nut_demuxer = {
1423	"nut",
1424	"nut format",
1425	sizeof(NUTContext),
1426	nut_probe,
1427	nut_read_header,
1428	nut_read_packet,
1429	nut_read_close,
1430	nut_read_seek,
1431	nut_read_timestamp,
1432	.extensions = "nut",
1433	};
1434
1435	#ifdef CONFIG_MUXERS
1436	static AVOutputFormat nut_muxer = {
1437	"nut",
1438	"nut format",
1439	"video/x-nut",
1440	"nut",
1441	sizeof(NUTContext),
1442	#ifdef CONFIG_LIBVORBIS
1443	CODEC_ID_VORBIS,
1444	#elif defined(CONFIG_MP3LAME)
1445	CODEC_ID_MP3,
1446	#else
1447	CODEC_ID_MP2, /* AC3 needs liba52 decoder */
1448	#endif
1449	CODEC_ID_MPEG4,
1450	nut_write_header,
1451	nut_write_packet,
1452	nut_write_trailer,
1453	.flags = AVFMT_GLOBALHEADER,
1454	};
1455	#endif //CONFIG_MUXERS
1456
1457	int nut_init(void)
1458	{
1459	av_register_input_format(&nut_demuxer);
1460	#ifdef CONFIG_MUXERS
1461	av_register_output_format(&nut_muxer);
1462	#endif //CONFIG_MUXERS
1463	return 0;
1464	}

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source: vbox/trunk/src/libs/ffmpeg-20060710/libavformat/nut.c@ 7692

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