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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
 *
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 * 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
 *
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 * You should have received a copy of the GNU General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
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 * NUT DRAFT can be found in MPlayer CVS at DOCS/tech/mpcf.txt
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 *
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 * AND http://people.fsn.hu/~alex/nut/ (TeX, pdf, ps, dvi, ..)
23
 *
24
 */
25

    
26
/*
27
 * TODO:
28
 * - index writing
29
 * - index packet reading support
30
*/
31

    
32
//#define DEBUG 1
33

    
34
#include <limits.h>
35
#include "avformat.h"
36
#include "mpegaudio.h"
37
#include "avi.h"
38

    
39
#undef NDEBUG
40
#include <assert.h>
41

    
42
//#define TRACE
43

    
44
//from /dev/random
45

    
46
#define     MAIN_STARTCODE (0x7A561F5F04ADULL + (((uint64_t)('N'<<8) + 'M')<<48)) 
47
#define   STREAM_STARTCODE (0x11405BF2F9DBULL + (((uint64_t)('N'<<8) + 'S')<<48)) 
48
#define KEYFRAME_STARTCODE (0xE4ADEECA4569ULL + (((uint64_t)('N'<<8) + 'K')<<48)) 
49
#define    INDEX_STARTCODE (0xDD672F23E64EULL + (((uint64_t)('N'<<8) + 'X')<<48)) 
50
#define     INFO_STARTCODE (0xAB68B596BA78ULL + (((uint64_t)('N'<<8) + 'I')<<48)) 
51

    
52
#define ID_STRING "nut/multimedia container\0"
53

    
54
#define MAX_DISTANCE (1024*16-1)
55
#define MAX_SHORT_DISTANCE (1024*4-1)
56

    
57
#define FLAG_DATA_SIZE       1
58
#define FLAG_KEY_FRAME       2
59
#define FLAG_INVALID         4
60

    
61
typedef struct {
62
    uint8_t flags;
63
    uint8_t stream_id_plus1;
64
    uint16_t size_mul;
65
    uint16_t size_lsb;
66
    int16_t timestamp_delta;
67
    uint8_t reserved_count;
68
} FrameCode;
69

    
70
typedef struct {
71
    int last_key_frame;
72
    int msb_timestamp_shift;
73
    int rate_num;
74
    int rate_den;
75
    int64_t last_pts;
76
    int64_t last_sync_pos;                    ///<pos of last 1/2 type frame
77
    int decode_delay;
78
} StreamContext;
79

    
80
typedef struct {
81
    AVFormatContext *avf;
82
    int written_packet_size;
83
    int64_t packet_start[3]; //0-> startcode less, 1-> short startcode 2-> long startcodes
84
    FrameCode frame_code[256];
85
    unsigned int stream_count;
86
    uint64_t next_startcode;     ///< stores the next startcode if it has alraedy been parsed but the stream isnt seekable
87
    StreamContext *stream;
88
    int max_distance;
89
    int max_short_distance;
90
    int rate_num;
91
    int rate_den;
92
    int short_startcode;
93
} NUTContext;
94

    
95
static char *info_table[][2]={
96
        {NULL                        ,  NULL }, // end
97
        {NULL                        ,  NULL },
98
        {NULL                        , "UTF8"},
99
        {NULL                        , "v"},
100
        {NULL                        , "s"},
101
        {"StreamId"                , "v"},
102
        {"SegmentId"                , "v"},
103
        {"StartTimestamp"        , "v"},
104
        {"EndTimestamp"                , "v"},
105
        {"Author"                , "UTF8"},
106
        {"Title"                , "UTF8"},
107
        {"Description"                , "UTF8"},
108
        {"Copyright"                , "UTF8"},
109
        {"Encoder"                , "UTF8"},
110
        {"Keyword"                , "UTF8"},
111
        {"Cover"                , "JPEG"},
112
        {"Cover"                , "PNG"},
113
};
114

    
115
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){
116
    StreamContext *stream= &nut->stream[stream_index];
117
    
118
    stream->last_key_frame= key_frame;
119
    nut->packet_start[ frame_type ]= frame_start;
120
    stream->last_pts= pts;
121
}
122

    
123
static void reset(AVFormatContext *s, int64_t global_ts){
124
    NUTContext *nut = s->priv_data;
125
    int i;
126
    
127
    for(i=0; i<s->nb_streams; i++){
128
        StreamContext *stream= &nut->stream[i];
129
    
130
        stream->last_key_frame= 1;
131

    
132
        stream->last_pts= av_rescale(global_ts, stream->rate_num*(int64_t)nut->rate_den, stream->rate_den*(int64_t)nut->rate_num);
133
    }
134
}
135

    
136
static void build_frame_code(AVFormatContext *s){
137
    NUTContext *nut = s->priv_data;
138
    int key_frame, index, pred, stream_id;
139
    int start=0;
140
    int end= 255;
141
    int keyframe_0_esc= s->nb_streams > 2;
142
    int pred_table[10];
143

    
144
    if(keyframe_0_esc){
145
        /* keyframe = 0 escape */
146
        FrameCode *ft= &nut->frame_code[start];
147
        ft->flags= FLAG_DATA_SIZE;
148
        ft->stream_id_plus1= 0;
149
        ft->size_mul=1;
150
        ft->timestamp_delta=0;
151
        start++;
152
    }
153

    
154
    for(stream_id= 0; stream_id<s->nb_streams; stream_id++){
155
        int start2= start + (end-start)*stream_id / s->nb_streams;
156
        int end2  = start + (end-start)*(stream_id+1) / s->nb_streams;
157
        AVCodecContext *codec = &s->streams[stream_id]->codec;
158
        int is_audio= codec->codec_type == CODEC_TYPE_AUDIO;
159
        int intra_only= /*codec->intra_only || */is_audio;
160
        int pred_count;
161

    
162
        for(key_frame=0; key_frame<2; key_frame++){
163
            if(intra_only && keyframe_0_esc && key_frame==0)
164
                continue;
165
            
166
            {
167
                FrameCode *ft= &nut->frame_code[start2];
168
                ft->flags= FLAG_KEY_FRAME*key_frame;
169
                ft->flags|= FLAG_DATA_SIZE;
170
                ft->stream_id_plus1= stream_id + 1;
171
                ft->size_mul=1;
172
                ft->timestamp_delta=0;
173
                start2++;
174
            }
175
        }
176

    
177
        key_frame= intra_only;
178
#if 1
179
        if(is_audio){
180
            int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);
181
            int pts;
182
            for(pts=0; pts<2; pts++){
183
                for(pred=0; pred<2; pred++){
184
                    FrameCode *ft= &nut->frame_code[start2];
185
                    ft->flags= FLAG_KEY_FRAME*key_frame;
186
                    ft->stream_id_plus1= stream_id + 1;
187
                    ft->size_mul=frame_bytes + 2;
188
                    ft->size_lsb=frame_bytes + pred;
189
                    ft->timestamp_delta=pts;
190
                    start2++;
191
                }
192
            }
193
        }else{
194
            FrameCode *ft= &nut->frame_code[start2];
195
            ft->flags= FLAG_KEY_FRAME | FLAG_DATA_SIZE;
196
            ft->stream_id_plus1= stream_id + 1;
197
            ft->size_mul=1;
198
            ft->timestamp_delta=1;
199
            start2++;
200
        }
201
#endif
202

    
203
        if(codec->has_b_frames){
204
            pred_count=5;
205
            pred_table[0]=-2;
206
            pred_table[1]=-1;
207
            pred_table[2]=1;
208
            pred_table[3]=3;
209
            pred_table[4]=4;
210
        }else if(codec->codec_id == CODEC_ID_VORBIS){
211
            pred_count=3;
212
            pred_table[0]=2;
213
            pred_table[1]=9;
214
            pred_table[2]=16;
215
        }else{
216
            pred_count=1;
217
            pred_table[0]=1;
218
        }
219

    
220
        for(pred=0; pred<pred_count; pred++){
221
            int start3= start2 + (end2-start2)*pred / pred_count;
222
            int end3  = start2 + (end2-start2)*(pred+1) / pred_count;
223

    
224
            for(index=start3; index<end3; index++){
225
                FrameCode *ft= &nut->frame_code[index];
226
                ft->flags= FLAG_KEY_FRAME*key_frame;
227
                ft->flags|= FLAG_DATA_SIZE;
228
                ft->stream_id_plus1= stream_id + 1;
229
//FIXME use single byte size and pred from last
230
                ft->size_mul= end3-start3;
231
                ft->size_lsb= index - start3;
232
                ft->timestamp_delta= pred_table[pred];
233
            }
234
        }
235
    }
236
    memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N'));
237
    nut->frame_code['N'].flags= FLAG_INVALID;
238
}
239

    
240
static uint64_t get_v(ByteIOContext *bc)
241
{
242
    uint64_t val = 0;
243

    
244
    for(;;)
245
    {
246
        int tmp = get_byte(bc);
247

    
248
        if (tmp&0x80)
249
            val= (val<<7) + tmp - 0x80;
250
        else{
251
//av_log(NULL, AV_LOG_DEBUG, "get_v()= %lld\n", (val<<7) + tmp);
252
            return (val<<7) + tmp;
253
        }
254
    }
255
    return -1;
256
}
257

    
258
static int get_str(ByteIOContext *bc, char *string, unsigned int maxlen){
259
    unsigned int len= get_v(bc);
260
    
261
    if(len && maxlen)
262
        get_buffer(bc, string, FFMIN(len, maxlen));
263
    while(len > maxlen){
264
        get_byte(bc);
265
        len--;
266
    }
267

    
268
    if(maxlen)
269
        string[FFMIN(len, maxlen-1)]= 0;
270
    
271
    if(maxlen == len)
272
        return -1;
273
    else
274
        return 0;
275
}
276

    
277
static int64_t get_s(ByteIOContext *bc){
278
    int64_t v = get_v(bc) + 1;
279

    
280
    if (v&1) return -(v>>1);
281
    else     return  (v>>1);
282
}
283

    
284
static uint64_t get_vb(ByteIOContext *bc){
285
    uint64_t val=0;
286
    unsigned int i= get_v(bc);
287
    
288
    if(i>8)
289
        return UINT64_MAX;
290
    
291
    while(i--)
292
        val = (val<<8) + get_byte(bc);
293
    
294
//av_log(NULL, AV_LOG_DEBUG, "get_vb()= %lld\n", val);
295
    return val;
296
}
297

    
298
#ifdef TRACE
299
static inline uint64_t get_v_trace(ByteIOContext *bc, char *file, char *func, int line){
300
    uint64_t v= get_v(bc);
301

    
302
    printf("get_v %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
303
    return v;
304
}
305

    
306
static inline int64_t get_s_trace(ByteIOContext *bc, char *file, char *func, int line){
307
    int64_t v= get_s(bc);
308

    
309
    printf("get_s %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
310
    return v;
311
}
312

    
313
static inline uint64_t get_vb_trace(ByteIOContext *bc, char *file, char *func, int line){
314
    uint64_t v= get_vb(bc);
315

    
316
    printf("get_vb %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
317
    return v;
318
}
319
#define get_v(bc)  get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
320
#define get_s(bc)  get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
321
#define get_vb(bc)  get_vb_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
322
#endif
323

    
324

    
325
static int get_packetheader(NUTContext *nut, ByteIOContext *bc, int calculate_checksum)
326
{
327
    int64_t start, size;
328
    start= url_ftell(bc) - 8;
329

    
330
    init_checksum(bc, calculate_checksum ? update_adler32 : NULL, 0);
331

    
332
    size= get_v(bc);
333

    
334
    nut->packet_start[2] = start;
335
    nut->written_packet_size= size;
336

    
337
    return size;
338
}
339

    
340
static int check_checksum(ByteIOContext *bc){
341
    unsigned long checksum= get_checksum(bc);
342
    return checksum != get_be32(bc);
343
}
344

    
345
/**
346
 * 
347
 */
348
static int get_length(uint64_t val){
349
    int i;
350

    
351
    for (i=7; val>>i; i+=7);
352

    
353
    return i;
354
}
355

    
356
static uint64_t find_any_startcode(ByteIOContext *bc, int64_t pos){
357
    uint64_t state=0;
358
    
359
    if(pos >= 0)
360
        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
361

    
362
    while(!url_feof(bc)){
363
        state= (state<<8) | get_byte(bc);
364
        if((state>>56) != 'N')
365
            continue;
366
        switch(state){
367
        case MAIN_STARTCODE:
368
        case STREAM_STARTCODE:
369
        case KEYFRAME_STARTCODE:
370
        case INFO_STARTCODE:
371
        case INDEX_STARTCODE:
372
            return state;
373
        }
374
    }
375

    
376
    return 0;
377
}
378

    
379
/**
380
 * find the given startcode.
381
 * @param code the startcode
382
 * @param pos the start position of the search, or -1 if the current position
383
 * @returns the position of the startcode or -1 if not found
384
 */
385
static int64_t find_startcode(ByteIOContext *bc, uint64_t code, int64_t pos){
386
    for(;;){
387
        uint64_t startcode= find_any_startcode(bc, pos);
388
        if(startcode == code)
389
            return url_ftell(bc) - 8;
390
        else if(startcode == 0)
391
            return -1;
392
        pos=-1;
393
    }
394
}
395

    
396
#ifdef CONFIG_ENCODERS
397

    
398
static void put_v(ByteIOContext *bc, uint64_t val)
399
{
400
    int i;
401

    
402
//av_log(NULL, AV_LOG_DEBUG, "put_v()= %lld\n", val);
403
    val &= 0x7FFFFFFFFFFFFFFFULL; // FIXME can only encode upto 63 bits currently
404
    i= get_length(val);
405

    
406
    for (i-=7; i>0; i-=7){
407
        put_byte(bc, 0x80 | (val>>i));
408
    }
409

    
410
    put_byte(bc, val&0x7f);
411
}
412

    
413
/**
414
 * stores a string as vb.
415
 */
416
static void put_str(ByteIOContext *bc, const char *string){
417
    int len= strlen(string);
418
    
419
    put_v(bc, len);
420
    put_buffer(bc, string, len);
421
}
422

    
423
static void put_s(ByteIOContext *bc, int64_t val){
424
    if (val<=0) put_v(bc, -2*val  );
425
    else        put_v(bc,  2*val-1);
426
}
427

    
428
static void put_vb(ByteIOContext *bc, uint64_t val){
429
    int i;
430
    
431
    for (i=8; val>>i; i+=8);
432

    
433
    put_v(bc, i>>3);
434
    for(i-=8; i>=0; i-=8)
435
        put_byte(bc, (val>>i)&0xFF);
436
}
437

    
438
#ifdef TRACE
439
static inline void put_v_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
440
    printf("get_v %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
441
    
442
    put_v(bc, v);
443
}
444

    
445
static inline void put_s_trace(ByteIOContext *bc, int64_t v, char *file, char *func, int line){
446
    printf("get_s %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
447
    
448
    put_s(bc, v);
449
}
450

    
451
static inline void put_vb_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
452
    printf("get_vb %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
453
    
454
    put_vb(bc, v);
455
}
456
#define put_v(bc, v)  put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
457
#define put_s(bc, v)  put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
458
#define put_vb(bc, v)  put_vb_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
459
#endif
460

    
461
static int put_packetheader(NUTContext *nut, ByteIOContext *bc, int max_size, int calculate_checksum)
462
{
463
    put_flush_packet(bc);
464
    nut->packet_start[2]+= nut->written_packet_size;
465
    assert(url_ftell(bc) - 8 == nut->packet_start[2]);
466
    nut->written_packet_size = max_size;
467
    
468
    if(calculate_checksum)
469
        init_checksum(bc, update_adler32, 0);
470

    
471
    /* packet header */
472
    put_v(bc, nut->written_packet_size); /* forward ptr */
473

    
474
    return 0;
475
}
476

    
477
static int update_packetheader(NUTContext *nut, ByteIOContext *bc, int additional_size, int calculate_checksum){
478
    int64_t start= nut->packet_start[2];
479
    int64_t cur= url_ftell(bc);
480
    int size= cur - start + additional_size;
481
    
482
    if(calculate_checksum)
483
        size += 4;
484
    
485
    if(size != nut->written_packet_size){
486
        int i;
487

    
488
        assert( size <= nut->written_packet_size );
489
    
490
        url_fseek(bc, start + 8, SEEK_SET);
491
        for(i=get_length(size); i < get_length(nut->written_packet_size); i+=7)
492
            put_byte(bc, 0x80);
493
        put_v(bc, size);
494

    
495
        url_fseek(bc, cur, SEEK_SET);
496
        nut->written_packet_size= size; //FIXME may fail if multiple updates with differing sizes, as get_length may differ
497
        
498
        if(calculate_checksum)
499
            put_be32(bc, get_checksum(bc));
500
    }
501
    
502
    return 0;
503
}
504

    
505
static int nut_write_header(AVFormatContext *s)
506
{
507
    NUTContext *nut = s->priv_data;
508
    ByteIOContext *bc = &s->pb;
509
    AVCodecContext *codec;
510
    int i, j, tmp_time, tmp_flags,tmp_stream, tmp_mul, tmp_size, tmp_fields;
511

    
512
    nut->avf= s;
513
    
514
    nut->stream =        
515
        av_mallocz(sizeof(StreamContext)*s->nb_streams);
516
        
517

    
518
    put_buffer(bc, ID_STRING, strlen(ID_STRING));
519
    put_byte(bc, 0);
520
    nut->packet_start[2]= url_ftell(bc);
521
    
522
    /* main header */
523
    put_be64(bc, MAIN_STARTCODE);
524
    put_packetheader(nut, bc, 120+5*256, 1);
525
    put_v(bc, 2); /* version */
526
    put_v(bc, s->nb_streams);
527
    put_v(bc, MAX_DISTANCE);
528
    put_v(bc, MAX_SHORT_DISTANCE);
529
    
530
    put_v(bc, nut->rate_num=1);
531
    put_v(bc, nut->rate_den=2);
532
    put_v(bc, nut->short_startcode=0x4EFE79);
533
    
534
    build_frame_code(s);
535
    assert(nut->frame_code['N'].flags == FLAG_INVALID);
536
    
537
    tmp_time= tmp_flags= tmp_stream= tmp_mul= tmp_size= /*tmp_res=*/ INT_MAX;
538
    for(i=0; i<256;){
539
        tmp_fields=0;
540
        tmp_size= 0;
541
        if(tmp_time   != nut->frame_code[i].timestamp_delta) tmp_fields=1;
542
        if(tmp_mul    != nut->frame_code[i].size_mul       ) tmp_fields=2;
543
        if(tmp_stream != nut->frame_code[i].stream_id_plus1) tmp_fields=3;
544
        if(tmp_size   != nut->frame_code[i].size_lsb       ) tmp_fields=4;
545
//        if(tmp_res    != nut->frame_code[i].res            ) tmp_fields=5;
546

    
547
        tmp_time  = nut->frame_code[i].timestamp_delta;
548
        tmp_flags = nut->frame_code[i].flags;
549
        tmp_stream= nut->frame_code[i].stream_id_plus1;
550
        tmp_mul   = nut->frame_code[i].size_mul;
551
        tmp_size  = nut->frame_code[i].size_lsb;
552
//        tmp_res   = nut->frame_code[i].res;
553
        
554
        for(j=0; i<256; j++,i++){
555
            if(nut->frame_code[i].timestamp_delta != tmp_time  ) break;
556
            if(nut->frame_code[i].flags           != tmp_flags ) break;
557
            if(nut->frame_code[i].stream_id_plus1 != tmp_stream) break;
558
            if(nut->frame_code[i].size_mul        != tmp_mul   ) break;
559
            if(nut->frame_code[i].size_lsb        != tmp_size+j) break;
560
//            if(nut->frame_code[i].res             != tmp_res   ) break;
561
        }
562
        if(j != tmp_mul - tmp_size) tmp_fields=6;
563

    
564
        put_v(bc, tmp_flags);
565
        put_v(bc, tmp_fields);
566
        if(tmp_fields>0) put_s(bc, tmp_time);
567
        if(tmp_fields>1) put_v(bc, tmp_mul);
568
        if(tmp_fields>2) put_v(bc, tmp_stream);
569
        if(tmp_fields>3) put_v(bc, tmp_size);
570
        if(tmp_fields>4) put_v(bc, 0 /*tmp_res*/);
571
        if(tmp_fields>5) put_v(bc, j);
572
    }
573

    
574
    update_packetheader(nut, bc, 0, 1);
575
    
576
    /* stream headers */
577
    for (i = 0; i < s->nb_streams; i++)
578
    {
579
        int nom, denom, gcd;
580

    
581
        codec = &s->streams[i]->codec;
582
        
583
        put_be64(bc, STREAM_STARTCODE);
584
        put_packetheader(nut, bc, 120 + codec->extradata_size, 1);
585
        put_v(bc, i /*s->streams[i]->index*/);
586
        put_v(bc, (codec->codec_type == CODEC_TYPE_AUDIO) ? 32 : 0);
587
        if (codec->codec_tag)
588
            put_vb(bc, codec->codec_tag);
589
        else if (codec->codec_type == CODEC_TYPE_VIDEO)
590
        {
591
            put_vb(bc, codec_get_bmp_tag(codec->codec_id));
592
        }
593
        else if (codec->codec_type == CODEC_TYPE_AUDIO)
594
        {
595
            put_vb(bc, codec_get_wav_tag(codec->codec_id));
596
        }
597
        else
598
            put_vb(bc, 0);
599

    
600
        if (codec->codec_type == CODEC_TYPE_VIDEO)
601
        {
602
            nom = codec->frame_rate;
603
            denom = codec->frame_rate_base;
604
        }
605
        else
606
        {
607
            nom = codec->sample_rate;
608
            if(codec->frame_size>0)
609
                denom= codec->frame_size;
610
            else
611
                denom= 1; //unlucky
612
        }
613
        gcd= ff_gcd(nom, denom);
614
        nom   /= gcd;
615
        denom /= gcd;
616
        nut->stream[i].rate_num= nom;
617
        nut->stream[i].rate_den= denom;
618
        av_set_pts_info(s->streams[i], 60, denom, nom);
619

    
620
        put_v(bc, codec->bit_rate);
621
        put_vb(bc, 0); /* no language code */
622
        put_v(bc, nom);
623
        put_v(bc, denom);
624
        if(nom / denom < 1000)
625
            nut->stream[i].msb_timestamp_shift = 7;
626
        else
627
            nut->stream[i].msb_timestamp_shift = 14;
628
        put_v(bc, nut->stream[i].msb_timestamp_shift);
629
        put_v(bc, codec->has_b_frames);
630
        put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
631
        
632
        if(codec->extradata_size){
633
            put_v(bc, 1);
634
            put_v(bc, codec->extradata_size);
635
            put_buffer(bc, codec->extradata, codec->extradata_size);            
636
        }
637
        put_v(bc, 0); /* end of codec specific headers */
638
        
639
        switch(codec->codec_type)
640
        {
641
            case CODEC_TYPE_AUDIO:
642
                put_v(bc, codec->sample_rate);
643
                put_v(bc, 1);
644
                put_v(bc, codec->channels);
645
                break;
646
            case CODEC_TYPE_VIDEO:
647
                put_v(bc, codec->width);
648
                put_v(bc, codec->height);
649
                put_v(bc, codec->sample_aspect_ratio.num);
650
                put_v(bc, codec->sample_aspect_ratio.den);
651
                put_v(bc, 0); /* csp type -- unknown */
652
                break;
653
            default:
654
                break;
655
        }
656
        update_packetheader(nut, bc, 0, 1);
657
    }
658

    
659
    /* info header */
660
    put_be64(bc, INFO_STARTCODE);
661
    put_packetheader(nut, bc, 30+strlen(s->author)+strlen(s->title)+
662
        strlen(s->comment)+strlen(s->copyright)+strlen(LIBAVFORMAT_IDENT), 1); 
663
    if (s->author[0])
664
    {
665
        put_v(bc, 9); /* type */
666
        put_str(bc, s->author);
667
    }
668
    if (s->title[0])
669
    {
670
        put_v(bc, 10); /* type */
671
        put_str(bc, s->title);
672
    }
673
    if (s->comment[0])
674
    {
675
        put_v(bc, 11); /* type */
676
        put_str(bc, s->comment);
677
    }
678
    if (s->copyright[0])
679
    {
680
        put_v(bc, 12); /* type */
681
        put_str(bc, s->copyright);
682
    }
683
    /* encoder */
684
    if(!(s->streams[0]->codec.flags & CODEC_FLAG_BITEXACT)){
685
        put_v(bc, 13); /* type */
686
        put_str(bc, LIBAVFORMAT_IDENT);
687
    }
688
    
689
    put_v(bc, 0); /* eof info */
690
    update_packetheader(nut, bc, 0, 1);
691
        
692
    put_flush_packet(bc);
693
    
694
    return 0;
695
}
696

    
697
static int64_t lsb2full(StreamContext *stream, int64_t lsb){
698
    int64_t mask = (1<<stream->msb_timestamp_shift)-1;
699
    int64_t delta= stream->last_pts - mask/2;
700
    return  ((lsb - delta)&mask) + delta;
701
}
702

    
703
static int nut_write_packet(AVFormatContext *s, AVPacket *pkt)
704
{
705
    NUTContext *nut = s->priv_data;
706
    StreamContext *stream= &nut->stream[pkt->stream_index];
707
    ByteIOContext *bc = &s->pb;
708
    int key_frame = 0, full_pts=0;
709
    AVCodecContext *enc;
710
    int64_t coded_pts;
711
    int frame_type, best_length, frame_code, flags, i, size_mul, size_lsb, time_delta;
712
    const int64_t frame_start= url_ftell(bc);
713
    int64_t pts= pkt->pts;
714
    int size= pkt->size;
715
    int stream_index= pkt->stream_index;
716

    
717
    enc = &s->streams[stream_index]->codec;
718
    key_frame = !!(pkt->flags & PKT_FLAG_KEY);
719
    
720
    frame_type=0;
721
    if(frame_start + size + 20 - FFMAX(nut->packet_start[1], nut->packet_start[2]) > MAX_DISTANCE)
722
        frame_type=2;
723
    if(key_frame && !stream->last_key_frame)
724
        frame_type=2;
725

    
726
    if(frame_type>1){
727
        int64_t global_ts= av_rescale(pts, stream->rate_den*(int64_t)nut->rate_num, stream->rate_num*(int64_t)nut->rate_den);
728
        reset(s, global_ts);
729
        put_be64(bc, KEYFRAME_STARTCODE);
730
        put_v(bc, global_ts);
731
    }
732
    assert(stream->last_pts != AV_NOPTS_VALUE);
733
    coded_pts = pts & ((1<<stream->msb_timestamp_shift)-1);
734
    if(lsb2full(stream, coded_pts) != pts)
735
        full_pts=1;
736

    
737
    if(full_pts)
738
        coded_pts= pts + (1<<stream->msb_timestamp_shift);
739

    
740
    best_length=INT_MAX;
741
    frame_code= -1;
742
    for(i=0; i<256; i++){
743
        int stream_id_plus1= nut->frame_code[i].stream_id_plus1;
744
        int fc_key_frame;
745
        int length=0;
746
        size_mul= nut->frame_code[i].size_mul;
747
        size_lsb= nut->frame_code[i].size_lsb;
748
        time_delta= nut->frame_code[i].timestamp_delta;
749
        flags= nut->frame_code[i].flags;
750

    
751
        assert(size_mul > size_lsb);
752
        
753
        if(stream_id_plus1 == 0) length+= get_length(stream_index);
754
        else if(stream_id_plus1 - 1 != stream_index)
755
            continue;
756
        fc_key_frame= !!(flags & FLAG_KEY_FRAME);
757

    
758
        assert(key_frame==0 || key_frame==1);
759
        if(fc_key_frame != key_frame)
760
            continue;
761

    
762
        if(flags & FLAG_DATA_SIZE){
763
            if(size % size_mul != size_lsb)
764
                continue;
765
            length += get_length(size / size_mul);
766
        }else if(size != size_lsb)
767
            continue;
768

    
769
        if(full_pts && time_delta)
770
            continue;
771
            
772
        if(!time_delta){
773
            length += get_length(coded_pts);
774
        }else{
775
            if(time_delta != pts - stream->last_pts)
776
                continue;
777
        }
778

    
779
        if(length < best_length){
780
            best_length= length;
781
            frame_code=i;
782
        }
783
//    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);
784
    }
785

    
786
    assert(frame_code != -1);
787
    flags= nut->frame_code[frame_code].flags;
788
    size_mul= nut->frame_code[frame_code].size_mul;
789
    size_lsb= nut->frame_code[frame_code].size_lsb;
790
    time_delta= nut->frame_code[frame_code].timestamp_delta;
791
#ifdef TRACE
792
    best_length /= 7;
793
    best_length ++; //frame_code
794
    if(frame_type==2){
795
        best_length += 8; // startcode
796
    }
797
    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);
798
//    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]);
799
#endif
800

    
801
    assert(frame_type != 1); //short startcode not implemented yet
802
    put_byte(bc, frame_code);
803

    
804
    if(nut->frame_code[frame_code].stream_id_plus1 == 0)
805
        put_v(bc, stream_index);
806
    if (!time_delta){
807
        put_v(bc, coded_pts);
808
    }
809
    if(flags & FLAG_DATA_SIZE)
810
        put_v(bc, size / size_mul);
811
    else
812
        assert(size == size_lsb);
813
    if(size > MAX_DISTANCE){
814
        assert(frame_type > 1);
815
    }
816
    
817
    put_buffer(bc, pkt->data, size);
818

    
819
    update(nut, stream_index, frame_start, frame_type, frame_code, key_frame, size, pts);
820
    
821
    return 0;
822
}
823

    
824
static int nut_write_trailer(AVFormatContext *s)
825
{
826
    NUTContext *nut = s->priv_data;
827
    ByteIOContext *bc = &s->pb;
828

    
829
#if 0
830
    int i;
831

832
    /* WRITE INDEX */
833

834
    for (i = 0; s->nb_streams; i++)
835
    {
836
        put_be64(bc, INDEX_STARTCODE);
837
        put_packetheader(nut, bc, 64, 1);
838
        put_v(bc, s->streams[i]->id);
839
        put_v(bc, ...);
840
        update_packetheader(nut, bc, 0, 1);
841
    }
842
#endif
843

    
844
    put_flush_packet(bc);
845
    
846
    av_freep(&nut->stream);
847

    
848
    return 0;
849
}
850
#endif //CONFIG_ENCODERS
851

    
852
static int nut_probe(AVProbeData *p)
853
{
854
    int i;
855
    uint64_t code= 0xff;
856

    
857
    for (i = 0; i < p->buf_size; i++) {
858
        code = (code << 8) | p->buf[i];
859
        if (code == MAIN_STARTCODE)
860
            return AVPROBE_SCORE_MAX;
861
    }
862
    return 0;
863
}
864

    
865
static int decode_main_header(NUTContext *nut){
866
    AVFormatContext *s= nut->avf;
867
    ByteIOContext *bc = &s->pb;
868
    uint64_t tmp;
869
    int i, j, tmp_stream, tmp_mul, tmp_time, tmp_size, count, tmp_res;
870
    
871
    get_packetheader(nut, bc, 1);
872

    
873
    tmp = get_v(bc);
874
    if (tmp != 2){
875
        av_log(s, AV_LOG_ERROR, "bad version (%Ld)\n", tmp);
876
        return -1;
877
    }
878
    
879
    nut->stream_count = get_v(bc);
880
    if(nut->stream_count > MAX_STREAMS){
881
        av_log(s, AV_LOG_ERROR, "too many streams\n");
882
        return -1;
883
    }
884
    nut->max_distance = get_v(bc);
885
    nut->max_short_distance = get_v(bc);
886
    nut->rate_num= get_v(bc);
887
    nut->rate_den= get_v(bc);
888
    nut->short_startcode= get_v(bc);
889
    if(nut->short_startcode>>16 != 'N'){
890
        av_log(s, AV_LOG_ERROR, "invalid short startcode %X\n", nut->short_startcode);
891
        return -1;
892
    }
893
    
894
    for(i=0; i<256;){
895
        int tmp_flags = get_v(bc);
896
        int tmp_fields= get_v(bc);
897
        if(tmp_fields>0) tmp_time  = get_s(bc);
898
        if(tmp_fields>1) tmp_mul   = get_v(bc);
899
        if(tmp_fields>2) tmp_stream= get_v(bc);
900
        if(tmp_fields>3) tmp_size  = get_v(bc);
901
        else             tmp_size  = 0;
902
        if(tmp_fields>4) tmp_res   = get_v(bc);
903
        else             tmp_res   = 0;
904
        if(tmp_fields>5) count     = get_v(bc);
905
        else             count     = tmp_mul - tmp_size;
906
        
907
        while(tmp_fields-- > 6) 
908
           get_v(bc);
909
        
910
        if(count == 0 || i+count > 256){
911
            av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
912
            return -1;
913
        }
914
        if(tmp_stream > nut->stream_count + 1){
915
            av_log(s, AV_LOG_ERROR, "illegal stream number\n");
916
            return -1;
917
        }
918

    
919
        for(j=0; j<count; j++,i++){
920
            nut->frame_code[i].flags           = tmp_flags ;
921
            nut->frame_code[i].timestamp_delta = tmp_time  ;
922
            nut->frame_code[i].stream_id_plus1 = tmp_stream;
923
            nut->frame_code[i].size_mul        = tmp_mul   ;
924
            nut->frame_code[i].size_lsb        = tmp_size+j;
925
            nut->frame_code[i].reserved_count  = tmp_res   ;
926
        }
927
    }
928
    if(nut->frame_code['N'].flags != FLAG_INVALID){
929
        av_log(s, AV_LOG_ERROR, "illegal frame_code table\n");
930
        return -1;
931
    }
932

    
933
    if(check_checksum(bc)){
934
        av_log(s, AV_LOG_ERROR, "Main header checksum missmatch\n");
935
        return -1;
936
    }
937

    
938
    return 0;
939
}
940

    
941
static int decode_stream_header(NUTContext *nut){
942
    AVFormatContext *s= nut->avf;
943
    ByteIOContext *bc = &s->pb;
944
    int class, nom, denom, stream_id;
945
    uint64_t tmp;
946
    AVStream *st;
947
    
948
    get_packetheader(nut, bc, 1);
949
    stream_id= get_v(bc);
950
    if(stream_id >= nut->stream_count || s->streams[stream_id])
951
        return -1;
952
    
953
    st = av_new_stream(s, stream_id);
954
    if (!st)
955
        return AVERROR_NOMEM;
956

    
957
    class = get_v(bc);
958
    tmp = get_vb(bc);
959
    st->codec.codec_tag= tmp;
960
    switch(class)
961
    {
962
        case 0:
963
            st->codec.codec_type = CODEC_TYPE_VIDEO;
964
            st->codec.codec_id = codec_get_bmp_id(tmp);
965
            if (st->codec.codec_id == CODEC_ID_NONE)
966
                av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
967
            break;
968
        case 32:
969
            st->codec.codec_type = CODEC_TYPE_AUDIO;
970
            st->codec.codec_id = codec_get_wav_id(tmp);
971
            if (st->codec.codec_id == CODEC_ID_NONE)
972
                av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
973
            break;
974
        default:
975
            av_log(s, AV_LOG_ERROR, "Unknown stream class (%d)\n", class);
976
            return -1;
977
    }
978
    s->bit_rate += get_v(bc);
979
    get_vb(bc); /* language code */
980
    nom = get_v(bc);
981
    denom = get_v(bc);
982
    nut->stream[stream_id].msb_timestamp_shift = get_v(bc);
983
    nut->stream[stream_id].decode_delay= get_v(bc);
984
    get_byte(bc); /* flags */
985

    
986
    /* codec specific data headers */
987
    while(get_v(bc) != 0){
988
        st->codec.extradata_size= get_v(bc);
989
        if((unsigned)st->codec.extradata_size > (1<<30))
990
            return -1;
991
        st->codec.extradata= av_mallocz(st->codec.extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
992
        get_buffer(bc, st->codec.extradata, st->codec.extradata_size);            
993
//            url_fskip(bc, get_v(bc));
994
    }
995
    
996
    if (class == 0) /* VIDEO */
997
    {
998
        st->codec.width = get_v(bc);
999
        st->codec.height = get_v(bc);
1000
        st->codec.sample_aspect_ratio.num= get_v(bc);
1001
        st->codec.sample_aspect_ratio.den= get_v(bc);
1002
        get_v(bc); /* csp type */
1003

    
1004
        st->codec.frame_rate = nom;
1005
        st->codec.frame_rate_base = denom;
1006
    }
1007
    if (class == 32) /* AUDIO */
1008
    {
1009
        st->codec.sample_rate = get_v(bc);
1010
        get_v(bc); // samplerate_den
1011
        st->codec.channels = get_v(bc);
1012
    }
1013
    if(check_checksum(bc)){
1014
        av_log(s, AV_LOG_ERROR, "Stream header %d checksum missmatch\n", stream_id);
1015
        return -1;
1016
    }
1017
    av_set_pts_info(s->streams[stream_id], 60, denom, nom);
1018
    nut->stream[stream_id].rate_num= nom;
1019
    nut->stream[stream_id].rate_den= denom;
1020
    return 0;
1021
}
1022

    
1023
static int decode_info_header(NUTContext *nut){
1024
    AVFormatContext *s= nut->avf;
1025
    ByteIOContext *bc = &s->pb;
1026
    
1027
    get_packetheader(nut, bc, 1);
1028

    
1029
    for(;;){
1030
        int id= get_v(bc);
1031
        char *name, *type, custom_name[256], custom_type[256];
1032

    
1033
        if(!id)
1034
            break;
1035
        else if(id >= sizeof(info_table)/sizeof(info_table[0])){
1036
            av_log(s, AV_LOG_ERROR, "info id is too large %d %d\n", id, sizeof(info_table)/sizeof(info_table[0]));
1037
            return -1;
1038
        }
1039

    
1040
        type= info_table[id][1];
1041
        name= info_table[id][0];
1042
//av_log(s, AV_LOG_DEBUG, "%d %s %s\n", id, type, name);
1043

    
1044
        if(!type){
1045
            get_str(bc, custom_type, sizeof(custom_type));
1046
            type= custom_type;
1047
        }
1048
        if(!name){
1049
            get_str(bc, custom_name, sizeof(custom_name));
1050
            name= custom_name;
1051
        }
1052
        
1053
        if(!strcmp(type, "v")){
1054
            get_v(bc);
1055
        }else{
1056
            if(!strcmp(name, "Author"))
1057
                get_str(bc, s->author, sizeof(s->author));
1058
            else if(!strcmp(name, "Title"))
1059
                get_str(bc, s->title, sizeof(s->title));
1060
            else if(!strcmp(name, "Copyright"))
1061
                get_str(bc, s->copyright, sizeof(s->copyright));
1062
            else if(!strcmp(name, "Description"))
1063
                get_str(bc, s->comment, sizeof(s->comment));
1064
            else
1065
                get_str(bc, NULL, 0);
1066
        }
1067
    }
1068
    if(check_checksum(bc)){
1069
        av_log(s, AV_LOG_ERROR, "Info header checksum missmatch\n");
1070
        return -1;
1071
    }
1072
    return 0;
1073
}
1074

    
1075
static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
1076
{
1077
    NUTContext *nut = s->priv_data;
1078
    ByteIOContext *bc = &s->pb;
1079
    int64_t pos;
1080
    int inited_stream_count;
1081

    
1082
    nut->avf= s;
1083
    
1084
    /* main header */
1085
    pos=0;
1086
    for(;;){
1087
        pos= find_startcode(bc, MAIN_STARTCODE, pos)+1;
1088
        if (pos<0){
1089
            av_log(s, AV_LOG_ERROR, "no main startcode found\n");
1090
            return -1;
1091
        }
1092
        if(decode_main_header(nut) >= 0)
1093
            break;
1094
    }
1095
    
1096
    
1097
    s->bit_rate = 0;
1098

    
1099
    nut->stream = av_malloc(sizeof(StreamContext)*nut->stream_count);
1100

    
1101
    /* stream headers */
1102
    pos=0;
1103
    for(inited_stream_count=0; inited_stream_count < nut->stream_count;){
1104
        pos= find_startcode(bc, STREAM_STARTCODE, pos)+1;
1105
        if (pos<0){
1106
            av_log(s, AV_LOG_ERROR, "not all stream headers found\n");
1107
            return -1;
1108
        }
1109
        if(decode_stream_header(nut) >= 0)
1110
            inited_stream_count++;
1111
    }
1112

    
1113
    /* info headers */
1114
    pos=0;
1115
    for(;;){
1116
        uint64_t startcode= find_any_startcode(bc, pos);
1117
        pos= url_ftell(bc);
1118

    
1119
        if(startcode==0){
1120
            av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
1121
            return -1;
1122
        }else if(startcode == KEYFRAME_STARTCODE){
1123
            nut->next_startcode= startcode;
1124
            break;
1125
        }else if(startcode != INFO_STARTCODE){
1126
            continue;
1127
        }
1128

    
1129
        decode_info_header(nut);
1130
    }
1131

    
1132
    return 0;
1133
}
1134

    
1135
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){
1136
    AVFormatContext *s= nut->avf;
1137
    StreamContext *stream;
1138
    ByteIOContext *bc = &s->pb;
1139
    int size, flags, size_mul, size_lsb, stream_id, time_delta;
1140
    int64_t pts = 0;
1141

    
1142
    if(frame_type < 2 && frame_start - nut->packet_start[2] > nut->max_distance){
1143
        av_log(s, AV_LOG_ERROR, "last frame must have been damaged\n");
1144
        return -1;
1145
    }
1146

    
1147
    if(frame_type)
1148
        nut->packet_start[ frame_type ]= frame_start; //otherwise 1 goto 1 may happen
1149
    
1150
    flags= nut->frame_code[frame_code].flags;
1151
    size_mul= nut->frame_code[frame_code].size_mul;
1152
    size_lsb= nut->frame_code[frame_code].size_lsb;
1153
    stream_id= nut->frame_code[frame_code].stream_id_plus1 - 1;
1154
    time_delta= nut->frame_code[frame_code].timestamp_delta;
1155
    
1156
    if(stream_id==-1)
1157
        stream_id= get_v(bc);
1158
    if(stream_id >= s->nb_streams){
1159
        av_log(s, AV_LOG_ERROR, "illegal stream_id\n");
1160
        return -1;
1161
    }
1162
    stream= &nut->stream[stream_id];
1163

    
1164
//    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]);
1165

    
1166
    *key_frame_ret= !!(flags & FLAG_KEY_FRAME);
1167

    
1168
    if(!time_delta){
1169
        int64_t mask = (1<<stream->msb_timestamp_shift)-1;
1170
        pts= get_v(bc);
1171
        if(pts > mask){
1172
            pts -= mask+1;
1173
        }else{
1174
            if(stream->last_pts == AV_NOPTS_VALUE){
1175
                av_log(s, AV_LOG_ERROR, "no reference pts available\n");
1176
                return -1;
1177
            }
1178
            pts= lsb2full(stream, pts);
1179
        }
1180
    }else{
1181
        if(stream->last_pts == AV_NOPTS_VALUE){
1182
            av_log(s, AV_LOG_ERROR, "no reference pts available\n");
1183
            return -1;
1184
        }
1185
        pts= stream->last_pts + time_delta;
1186
    }
1187

    
1188
    if(*key_frame_ret){
1189
//        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);
1190
        av_add_index_entry(
1191
            s->streams[stream_id], 
1192
            frame_start, 
1193
            pts, 
1194
            frame_start - nut->stream[stream_id].last_sync_pos,
1195
            AVINDEX_KEYFRAME);
1196
        nut->stream[stream_id].last_sync_pos= frame_start;
1197
//                assert(nut->packet_start == frame_start);
1198
    }
1199

    
1200
    assert(size_mul > size_lsb);
1201
    size= size_lsb;
1202
    if(flags & FLAG_DATA_SIZE)
1203
        size+= size_mul*get_v(bc);
1204
      
1205
#ifdef TRACE
1206
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);
1207
#endif
1208

    
1209
    if(frame_type==0 && url_ftell(bc) - nut->packet_start[2] + size > nut->max_distance){
1210
        av_log(s, AV_LOG_ERROR, "frame size too large\n");
1211
        return -1;
1212
    }
1213
    
1214
    *stream_id_ret = stream_id;
1215
    *pts_ret = pts;
1216

    
1217
    update(nut, stream_id, frame_start, frame_type, frame_code, *key_frame_ret, size, pts);
1218

    
1219
    return size;
1220
}
1221

    
1222
static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code, int frame_type, int64_t frame_start){
1223
    AVFormatContext *s= nut->avf;
1224
    ByteIOContext *bc = &s->pb;
1225
    int size, stream_id, key_frame, discard;
1226
    int64_t pts, last_IP_pts;
1227
    
1228
    size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type, frame_start);
1229
    if(size < 0)
1230
        return -1;
1231

    
1232
    discard= s->streams[ stream_id ]->discard;
1233
    last_IP_pts= s->streams[ stream_id ]->last_IP_pts;
1234
    if(  (discard >= AVDISCARD_NONKEY && !key_frame)
1235
       ||(discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE && last_IP_pts > pts)
1236
       || discard >= AVDISCARD_ALL){
1237
        url_fskip(bc, size);
1238
        return 1;
1239
    }
1240

    
1241
    av_new_packet(pkt, size);
1242
    get_buffer(bc, pkt->data, size);
1243
    pkt->stream_index = stream_id;
1244
    if (key_frame)
1245
        pkt->flags |= PKT_FLAG_KEY;
1246
    pkt->pts = pts;
1247

    
1248
    return 0;
1249
}
1250

    
1251
static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
1252
{
1253
    NUTContext *nut = s->priv_data;
1254
    ByteIOContext *bc = &s->pb;
1255
    int i, frame_code=0, ret;
1256

    
1257
    for(;;){
1258
        int64_t pos= url_ftell(bc);
1259
        int frame_type= 0;
1260
        uint64_t tmp= nut->next_startcode;
1261
        nut->next_startcode=0;
1262

    
1263
        if (url_feof(bc))
1264
            return -1;
1265

    
1266
        if(tmp){
1267
            pos-=8;
1268
        }else{
1269
            frame_code = get_byte(bc);
1270
            if(frame_code == 'N'){
1271
                tmp= frame_code;
1272
                for(i=1; i<8; i++)
1273
                    tmp = (tmp<<8) + get_byte(bc);
1274
            }
1275
        }
1276
        switch(tmp){
1277
        case MAIN_STARTCODE:
1278
        case STREAM_STARTCODE:
1279
        case INDEX_STARTCODE:
1280
            get_packetheader(nut, bc, 0);
1281
            assert(nut->packet_start[2] == pos);
1282
            url_fseek(bc, nut->written_packet_size + nut->packet_start[2], SEEK_SET);
1283
            break;
1284
        case INFO_STARTCODE:
1285
            if(decode_info_header(nut)<0)
1286
                goto resync;
1287
            break;
1288
        case KEYFRAME_STARTCODE:
1289
            frame_type = 2;
1290
            reset(s, get_v(bc));
1291
            frame_code = get_byte(bc);
1292
        case 0:
1293
            ret= decode_frame(nut, pkt, frame_code, frame_type, pos);
1294
            if(ret==0)
1295
                return 0;
1296
            else if(ret==1) //ok but discard packet
1297
                break;
1298
        default:
1299
resync:
1300
av_log(s, AV_LOG_DEBUG, "syncing from %lld\n", nut->packet_start[2]+1);
1301
            tmp= find_any_startcode(bc, nut->packet_start[2]+1);
1302
            if(tmp==0)
1303
                return -1;
1304
av_log(s, AV_LOG_DEBUG, "sync\n");
1305
            nut->next_startcode= tmp;
1306
        }
1307
    }
1308
}
1309

    
1310
static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos_arg, int64_t pos_limit){
1311
    NUTContext *nut = s->priv_data;
1312
    StreamContext *stream;
1313
    ByteIOContext *bc = &s->pb;
1314
    int64_t pos, pts;
1315
    uint64_t code;
1316
    int frame_code,step, stream_id, i,size, key_frame;
1317
av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%lld,%lld)\n", stream_index, *pos_arg, pos_limit);
1318

    
1319
    if(*pos_arg < 0)
1320
        return AV_NOPTS_VALUE;
1321

    
1322
    pos= *pos_arg;
1323
    step= FFMIN(16*1024, pos);
1324
    do{
1325
        pos-= step;
1326
        code= find_any_startcode(bc, pos);
1327

    
1328
        if(code && url_ftell(bc) - 8 <= *pos_arg)
1329
            break;
1330
        step= FFMIN(2*step, pos);
1331
    }while(step);
1332

    
1333
    if(!code) //nothing found, not even after pos_arg
1334
        return AV_NOPTS_VALUE;
1335

    
1336
    url_fseek(bc, -8, SEEK_CUR);
1337
    for(i=0; i<s->nb_streams; i++)
1338
        nut->stream[i].last_sync_pos= url_ftell(bc);
1339
        
1340
    for(;;){
1341
        int frame_type=0;
1342
        int64_t pos= url_ftell(bc);
1343
        uint64_t tmp=0;
1344
        
1345
        if(pos > pos_limit || url_feof(bc))
1346
            return AV_NOPTS_VALUE;
1347

    
1348
        frame_code = get_byte(bc);
1349
        if(frame_code == 'N'){
1350
            tmp= frame_code;
1351
            for(i=1; i<8; i++)
1352
                tmp = (tmp<<8) + get_byte(bc);
1353
        }
1354
//av_log(s, AV_LOG_DEBUG, "before switch %llX at=%lld\n", tmp, pos);
1355

    
1356
        switch(tmp){
1357
        case MAIN_STARTCODE:
1358
        case STREAM_STARTCODE:
1359
        case INDEX_STARTCODE:
1360
        case INFO_STARTCODE:
1361
            get_packetheader(nut, bc, 0);
1362
            assert(nut->packet_start[2]==pos);
1363
            url_fseek(bc, nut->written_packet_size + pos, SEEK_SET);
1364
            break;
1365
        case KEYFRAME_STARTCODE:
1366
            frame_type=2;
1367
            reset(s, get_v(bc));
1368
            frame_code = get_byte(bc);
1369
        case 0:
1370
            size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type, pos);
1371
            if(size < 0)
1372
                goto resync;
1373
                
1374
            stream= &nut->stream[stream_id];
1375
            if(stream_id != stream_index || !key_frame || pos < *pos_arg){
1376
                url_fseek(bc, size, SEEK_CUR);
1377
                break;
1378
            }
1379
 
1380
            *pos_arg= pos;
1381
            return pts;
1382
        default:
1383
resync:
1384
av_log(s, AV_LOG_DEBUG, "syncing from %lld\n", nut->packet_start[2]+1);
1385
            if(!find_any_startcode(bc, nut->packet_start[2]+1))
1386
                return AV_NOPTS_VALUE;
1387

    
1388
            url_fseek(bc, -8, SEEK_CUR);
1389
        }
1390
    }
1391
    return AV_NOPTS_VALUE;
1392
}
1393

    
1394
static int nut_read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1395
//    NUTContext *nut = s->priv_data;
1396
    int64_t pos;
1397

    
1398
    if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1399
        return -1;
1400

    
1401
    pos= url_ftell(&s->pb);
1402
    nut_read_timestamp(s, stream_index, &pos, pos-1);
1403

    
1404
    return 0;
1405
}
1406

    
1407
static int nut_read_close(AVFormatContext *s)
1408
{
1409
    NUTContext *nut = s->priv_data;
1410
    int i;
1411

    
1412
    for(i=0;i<s->nb_streams;i++) {
1413
        av_freep(&s->streams[i]->codec.extradata);
1414
    }
1415
    av_freep(&nut->stream);
1416

    
1417
    return 0;
1418
}
1419

    
1420
static AVInputFormat nut_iformat = {
1421
    "nut",
1422
    "nut format",
1423
    sizeof(NUTContext),
1424
    nut_probe,
1425
    nut_read_header,
1426
    nut_read_packet,
1427
    nut_read_close,
1428
    nut_read_seek,
1429
    nut_read_timestamp,
1430
    .extensions = "nut",
1431
};
1432

    
1433
#ifdef CONFIG_ENCODERS
1434
static AVOutputFormat nut_oformat = {
1435
    "nut",
1436
    "nut format",
1437
    "video/x-nut",
1438
    "nut",
1439
    sizeof(NUTContext),
1440
#ifdef CONFIG_LIBVORBIS
1441
    CODEC_ID_VORBIS,
1442
#elif defined(CONFIG_MP3LAME)
1443
    CODEC_ID_MP3,
1444
#else
1445
    CODEC_ID_MP2, /* AC3 needs liba52 decoder */
1446
#endif
1447
    CODEC_ID_MPEG4,
1448
    nut_write_header,
1449
    nut_write_packet,
1450
    nut_write_trailer,
1451
};
1452
#endif //CONFIG_ENCODERS
1453

    
1454
int nut_init(void)
1455
{
1456
    av_register_input_format(&nut_iformat);
1457
#ifdef CONFIG_ENCODERS
1458
    av_register_output_format(&nut_oformat);
1459
#endif //CONFIG_ENCODERS
1460
    return 0;
1461
}