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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
 *
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
 *
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 * You should have received a copy of the GNU General Public
17
 * 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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 *
20
 *
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 * Visit the official site at http://www.nut.hu/
22
 *
23
 */
24

    
25
/*
26
 * TODO:
27
 * - index writing
28
 * - index packet reading support
29
*/
30

    
31
//#define DEBUG 1
32

    
33
#include <limits.h>
34
#include "avformat.h"
35
#include "mpegaudio.h"
36
#include "avi.h"
37

    
38
#undef NDEBUG
39
#include <assert.h>
40

    
41
//#define TRACE
42

    
43
//from /dev/random
44

    
45
#define     MAIN_STARTCODE (0x7A561F5F04ADULL + (((uint64_t)('N'<<8) + 'M')<<48)) 
46
#define   STREAM_STARTCODE (0x11405BF2F9DBULL + (((uint64_t)('N'<<8) + 'S')<<48)) 
47
#define KEYFRAME_STARTCODE (0xE4ADEECA4569ULL + (((uint64_t)('N'<<8) + 'K')<<48)) 
48
#define    INDEX_STARTCODE (0xDD672F23E64EULL + (((uint64_t)('N'<<8) + 'X')<<48)) 
49
#define     INFO_STARTCODE (0xAB68B596BA78ULL + (((uint64_t)('N'<<8) + 'I')<<48)) 
50

    
51
#define ID_STRING "nut/multimedia container\0"
52

    
53
#define MAX_DISTANCE (1024*16-1)
54
#define MAX_SHORT_DISTANCE (1024*4-1)
55

    
56
#define FLAG_DATA_SIZE       1
57
#define FLAG_KEY_FRAME       2
58
#define FLAG_INVALID         4
59

    
60
typedef struct {
61
    uint8_t flags;
62
    uint8_t stream_id_plus1;
63
    uint16_t size_mul;
64
    uint16_t size_lsb;
65
    int16_t timestamp_delta;
66
    uint8_t reserved_count;
67
} FrameCode;
68

    
69
typedef struct {
70
    int last_key_frame;
71
    int msb_timestamp_shift;
72
    int rate_num;
73
    int rate_den;
74
    int64_t last_pts;
75
    int64_t last_sync_pos;                    ///<pos of last 1/2 type frame
76
    int decode_delay;
77
} StreamContext;
78

    
79
typedef struct {
80
    AVFormatContext *avf;
81
    int written_packet_size;
82
    int64_t packet_start[3]; //0-> startcode less, 1-> short startcode 2-> long startcodes
83
    FrameCode frame_code[256];
84
    unsigned int stream_count;
85
    uint64_t next_startcode;     ///< stores the next startcode if it has alraedy been parsed but the stream isnt seekable
86
    StreamContext *stream;
87
    int max_distance;
88
    int max_short_distance;
89
    int rate_num;
90
    int rate_den;
91
    int short_startcode;
92
} NUTContext;
93

    
94
static char *info_table[][2]={
95
        {NULL                        ,  NULL }, // end
96
        {NULL                        ,  NULL },
97
        {NULL                        , "UTF8"},
98
        {NULL                        , "v"},
99
        {NULL                        , "s"},
100
        {"StreamId"                , "v"},
101
        {"SegmentId"                , "v"},
102
        {"StartTimestamp"        , "v"},
103
        {"EndTimestamp"                , "v"},
104
        {"Author"                , "UTF8"},
105
        {"Title"                , "UTF8"},
106
        {"Description"                , "UTF8"},
107
        {"Copyright"                , "UTF8"},
108
        {"Encoder"                , "UTF8"},
109
        {"Keyword"                , "UTF8"},
110
        {"Cover"                , "JPEG"},
111
        {"Cover"                , "PNG"},
112
};
113

    
114
void ff_parse_specific_params(AVCodecContext *stream, int *au_rate, int *au_ssize, int *au_scale);
115

    
116
static void update(NUTContext *nut, int stream_index, int64_t frame_start, int frame_type, int frame_code, int key_frame, int size, int64_t pts){
117
    StreamContext *stream= &nut->stream[stream_index];
118
    
119
    stream->last_key_frame= key_frame;
120
    nut->packet_start[ frame_type ]= frame_start;
121
    stream->last_pts= pts;
122
}
123

    
124
static void reset(AVFormatContext *s, int64_t global_ts){
125
    NUTContext *nut = s->priv_data;
126
    int i;
127
    
128
    for(i=0; i<s->nb_streams; i++){
129
        StreamContext *stream= &nut->stream[i];
130
    
131
        stream->last_key_frame= 1;
132

    
133
        stream->last_pts= av_rescale(global_ts, stream->rate_num*(int64_t)nut->rate_den, stream->rate_den*(int64_t)nut->rate_num);
134
    }
135
}
136

    
137
static void build_frame_code(AVFormatContext *s){
138
    NUTContext *nut = s->priv_data;
139
    int key_frame, index, pred, stream_id;
140
    int start=0;
141
    int end= 255;
142
    int keyframe_0_esc= s->nb_streams > 2;
143
    int pred_table[10];
144

    
145
    if(keyframe_0_esc){
146
        /* keyframe = 0 escape */
147
        FrameCode *ft= &nut->frame_code[start];
148
        ft->flags= FLAG_DATA_SIZE;
149
        ft->stream_id_plus1= 0;
150
        ft->size_mul=1;
151
        ft->timestamp_delta=0;
152
        start++;
153
    }
154

    
155
    for(stream_id= 0; stream_id<s->nb_streams; stream_id++){
156
        int start2= start + (end-start)*stream_id / s->nb_streams;
157
        int end2  = start + (end-start)*(stream_id+1) / s->nb_streams;
158
        AVCodecContext *codec = s->streams[stream_id]->codec;
159
        int is_audio= codec->codec_type == CODEC_TYPE_AUDIO;
160
        int intra_only= /*codec->intra_only || */is_audio;
161
        int pred_count;
162

    
163
        for(key_frame=0; key_frame<2; key_frame++){
164
            if(intra_only && keyframe_0_esc && key_frame==0)
165
                continue;
166
            
167
            {
168
                FrameCode *ft= &nut->frame_code[start2];
169
                ft->flags= FLAG_KEY_FRAME*key_frame;
170
                ft->flags|= FLAG_DATA_SIZE;
171
                ft->stream_id_plus1= stream_id + 1;
172
                ft->size_mul=1;
173
                ft->timestamp_delta=0;
174
                start2++;
175
            }
176
        }
177

    
178
        key_frame= intra_only;
179
#if 1
180
        if(is_audio){
181
            int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);
182
            int pts;
183
            for(pts=0; pts<2; pts++){
184
                for(pred=0; pred<2; pred++){
185
                    FrameCode *ft= &nut->frame_code[start2];
186
                    ft->flags= FLAG_KEY_FRAME*key_frame;
187
                    ft->stream_id_plus1= stream_id + 1;
188
                    ft->size_mul=frame_bytes + 2;
189
                    ft->size_lsb=frame_bytes + pred;
190
                    ft->timestamp_delta=pts;
191
                    start2++;
192
                }
193
            }
194
        }else{
195
            FrameCode *ft= &nut->frame_code[start2];
196
            ft->flags= FLAG_KEY_FRAME | FLAG_DATA_SIZE;
197
            ft->stream_id_plus1= stream_id + 1;
198
            ft->size_mul=1;
199
            ft->timestamp_delta=1;
200
            start2++;
201
        }
202
#endif
203

    
204
        if(codec->has_b_frames){
205
            pred_count=5;
206
            pred_table[0]=-2;
207
            pred_table[1]=-1;
208
            pred_table[2]=1;
209
            pred_table[3]=3;
210
            pred_table[4]=4;
211
        }else if(codec->codec_id == CODEC_ID_VORBIS){
212
            pred_count=3;
213
            pred_table[0]=2;
214
            pred_table[1]=9;
215
            pred_table[2]=16;
216
        }else{
217
            pred_count=1;
218
            pred_table[0]=1;
219
        }
220

    
221
        for(pred=0; pred<pred_count; pred++){
222
            int start3= start2 + (end2-start2)*pred / pred_count;
223
            int end3  = start2 + (end2-start2)*(pred+1) / pred_count;
224

    
225
            for(index=start3; index<end3; index++){
226
                FrameCode *ft= &nut->frame_code[index];
227
                ft->flags= FLAG_KEY_FRAME*key_frame;
228
                ft->flags|= FLAG_DATA_SIZE;
229
                ft->stream_id_plus1= stream_id + 1;
230
//FIXME use single byte size and pred from last
231
                ft->size_mul= end3-start3;
232
                ft->size_lsb= index - start3;
233
                ft->timestamp_delta= pred_table[pred];
234
            }
235
        }
236
    }
237
    memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N'));
238
    nut->frame_code['N'].flags= FLAG_INVALID;
239
}
240

    
241
static uint64_t get_v(ByteIOContext *bc)
242
{
243
    uint64_t val = 0;
244

    
245
    for(;;)
246
    {
247
        int tmp = get_byte(bc);
248

    
249
        if (tmp&0x80)
250
            val= (val<<7) + tmp - 0x80;
251
        else{
252
//av_log(NULL, AV_LOG_DEBUG, "get_v()= %lld\n", (val<<7) + tmp);
253
            return (val<<7) + tmp;
254
        }
255
    }
256
    return -1;
257
}
258

    
259
static int get_str(ByteIOContext *bc, char *string, unsigned int maxlen){
260
    unsigned int len= get_v(bc);
261
    
262
    if(len && maxlen)
263
        get_buffer(bc, string, FFMIN(len, maxlen));
264
    while(len > maxlen){
265
        get_byte(bc);
266
        len--;
267
    }
268

    
269
    if(maxlen)
270
        string[FFMIN(len, maxlen-1)]= 0;
271
    
272
    if(maxlen == len)
273
        return -1;
274
    else
275
        return 0;
276
}
277

    
278
static int64_t get_s(ByteIOContext *bc){
279
    int64_t v = get_v(bc) + 1;
280

    
281
    if (v&1) return -(v>>1);
282
    else     return  (v>>1);
283
}
284

    
285
static uint64_t get_vb(ByteIOContext *bc){
286
    uint64_t val=0;
287
    unsigned int i= get_v(bc);
288
    
289
    if(i>8)
290
        return UINT64_MAX;
291
    
292
    while(i--)
293
        val = (val<<8) + get_byte(bc);
294
    
295
//av_log(NULL, AV_LOG_DEBUG, "get_vb()= %lld\n", val);
296
    return val;
297
}
298

    
299
#ifdef TRACE
300
static inline uint64_t get_v_trace(ByteIOContext *bc, char *file, char *func, int line){
301
    uint64_t v= get_v(bc);
302

    
303
    printf("get_v %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
304
    return v;
305
}
306

    
307
static inline int64_t get_s_trace(ByteIOContext *bc, char *file, char *func, int line){
308
    int64_t v= get_s(bc);
309

    
310
    printf("get_s %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
311
    return v;
312
}
313

    
314
static inline uint64_t get_vb_trace(ByteIOContext *bc, char *file, char *func, int line){
315
    uint64_t v= get_vb(bc);
316

    
317
    printf("get_vb %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
318
    return v;
319
}
320
#define get_v(bc)  get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
321
#define get_s(bc)  get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
322
#define get_vb(bc)  get_vb_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
323
#endif
324

    
325

    
326
static int get_packetheader(NUTContext *nut, ByteIOContext *bc, int calculate_checksum)
327
{
328
    int64_t start, size;
329
    start= url_ftell(bc) - 8;
330

    
331
    init_checksum(bc, calculate_checksum ? update_adler32 : NULL, 0);
332

    
333
    size= get_v(bc);
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
#ifdef CONFIG_ENCODERS
398

    
399
static void put_v(ByteIOContext *bc, uint64_t val)
400
{
401
    int i;
402

    
403
//av_log(NULL, AV_LOG_DEBUG, "put_v()= %lld\n", val);
404
    val &= 0x7FFFFFFFFFFFFFFFULL; // FIXME can only encode upto 63 bits currently
405
    i= get_length(val);
406

    
407
    for (i-=7; i>0; i-=7){
408
        put_byte(bc, 0x80 | (val>>i));
409
    }
410

    
411
    put_byte(bc, val&0x7f);
412
}
413

    
414
/**
415
 * stores a string as vb.
416
 */
417
static void put_str(ByteIOContext *bc, const char *string){
418
    int len= strlen(string);
419
    
420
    put_v(bc, len);
421
    put_buffer(bc, string, len);
422
}
423

    
424
static void put_s(ByteIOContext *bc, int64_t val){
425
    if (val<=0) put_v(bc, -2*val  );
426
    else        put_v(bc,  2*val-1);
427
}
428

    
429
static void put_vb(ByteIOContext *bc, uint64_t val){
430
    int i;
431
    
432
    for (i=8; val>>i; i+=8);
433

    
434
    put_v(bc, i>>3);
435
    for(i-=8; i>=0; i-=8)
436
        put_byte(bc, (val>>i)&0xFF);
437
}
438

    
439
#ifdef TRACE
440
static inline void put_v_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
441
    printf("get_v %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
442
    
443
    put_v(bc, v);
444
}
445

    
446
static inline void put_s_trace(ByteIOContext *bc, int64_t v, char *file, char *func, int line){
447
    printf("get_s %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
448
    
449
    put_s(bc, v);
450
}
451

    
452
static inline void put_vb_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
453
    printf("get_vb %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
454
    
455
    put_vb(bc, v);
456
}
457
#define put_v(bc, v)  put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
458
#define put_s(bc, v)  put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
459
#define put_vb(bc, v)  put_vb_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
460
#endif
461

    
462
static int put_packetheader(NUTContext *nut, ByteIOContext *bc, int max_size, int calculate_checksum)
463
{
464
    put_flush_packet(bc);
465
    nut->packet_start[2]= url_ftell(bc) - 8;
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
/**
478
 *
479
 * must not be called more then once per packet
480
 */
481
static int update_packetheader(NUTContext *nut, ByteIOContext *bc, int additional_size, int calculate_checksum){
482
    int64_t start= nut->packet_start[2];
483
    int64_t cur= url_ftell(bc);
484
    int size= cur - start - get_length(nut->written_packet_size)/7 - 8;
485
    
486
    if(calculate_checksum)
487
        size += 4;
488
    
489
    if(size != nut->written_packet_size){
490
        int i;
491

    
492
        assert( size <= nut->written_packet_size );
493
    
494
        url_fseek(bc, start + 8, SEEK_SET);
495
        for(i=get_length(size); i < get_length(nut->written_packet_size); i+=7)
496
            put_byte(bc, 0x80);
497
        put_v(bc, size);
498

    
499
        url_fseek(bc, cur, SEEK_SET);
500
        nut->written_packet_size= size; //FIXME may fail if multiple updates with differing sizes, as get_length may differ
501
        
502
        if(calculate_checksum)
503
            put_be32(bc, get_checksum(bc));
504
    }
505
    
506
    return 0;
507
}
508

    
509
static int nut_write_header(AVFormatContext *s)
510
{
511
    NUTContext *nut = s->priv_data;
512
    ByteIOContext *bc = &s->pb;
513
    AVCodecContext *codec;
514
    int i, j, tmp_time, tmp_flags,tmp_stream, tmp_mul, tmp_size, tmp_fields;
515

    
516
    nut->avf= s;
517
    
518
    nut->stream =        
519
        av_mallocz(sizeof(StreamContext)*s->nb_streams);
520
        
521

    
522
    put_buffer(bc, ID_STRING, strlen(ID_STRING));
523
    put_byte(bc, 0);
524
    nut->packet_start[2]= url_ftell(bc);
525
    
526
    /* main header */
527
    put_be64(bc, MAIN_STARTCODE);
528
    put_packetheader(nut, bc, 120+5*256, 1);
529
    put_v(bc, 2); /* version */
530
    put_v(bc, s->nb_streams);
531
    put_v(bc, MAX_DISTANCE);
532
    put_v(bc, MAX_SHORT_DISTANCE);
533
    
534
    put_v(bc, nut->rate_num=1);
535
    put_v(bc, nut->rate_den=2);
536
    put_v(bc, nut->short_startcode=0x4EFE79);
537
    
538
    build_frame_code(s);
539
    assert(nut->frame_code['N'].flags == FLAG_INVALID);
540
    
541
    tmp_time= tmp_flags= tmp_stream= tmp_mul= tmp_size= /*tmp_res=*/ INT_MAX;
542
    for(i=0; i<256;){
543
        tmp_fields=0;
544
        tmp_size= 0;
545
        if(tmp_time   != nut->frame_code[i].timestamp_delta) tmp_fields=1;
546
        if(tmp_mul    != nut->frame_code[i].size_mul       ) tmp_fields=2;
547
        if(tmp_stream != nut->frame_code[i].stream_id_plus1) tmp_fields=3;
548
        if(tmp_size   != nut->frame_code[i].size_lsb       ) tmp_fields=4;
549
//        if(tmp_res    != nut->frame_code[i].res            ) tmp_fields=5;
550

    
551
        tmp_time  = nut->frame_code[i].timestamp_delta;
552
        tmp_flags = nut->frame_code[i].flags;
553
        tmp_stream= nut->frame_code[i].stream_id_plus1;
554
        tmp_mul   = nut->frame_code[i].size_mul;
555
        tmp_size  = nut->frame_code[i].size_lsb;
556
//        tmp_res   = nut->frame_code[i].res;
557
        
558
        for(j=0; i<256; j++,i++){
559
            if(nut->frame_code[i].timestamp_delta != tmp_time  ) break;
560
            if(nut->frame_code[i].flags           != tmp_flags ) break;
561
            if(nut->frame_code[i].stream_id_plus1 != tmp_stream) break;
562
            if(nut->frame_code[i].size_mul        != tmp_mul   ) break;
563
            if(nut->frame_code[i].size_lsb        != tmp_size+j) break;
564
//            if(nut->frame_code[i].res             != tmp_res   ) break;
565
        }
566
        if(j != tmp_mul - tmp_size) tmp_fields=6;
567

    
568
        put_v(bc, tmp_flags);
569
        put_v(bc, tmp_fields);
570
        if(tmp_fields>0) put_s(bc, tmp_time);
571
        if(tmp_fields>1) put_v(bc, tmp_mul);
572
        if(tmp_fields>2) put_v(bc, tmp_stream);
573
        if(tmp_fields>3) put_v(bc, tmp_size);
574
        if(tmp_fields>4) put_v(bc, 0 /*tmp_res*/);
575
        if(tmp_fields>5) put_v(bc, j);
576
    }
577

    
578
    update_packetheader(nut, bc, 0, 1);
579
    
580
    /* stream headers */
581
    for (i = 0; i < s->nb_streams; i++)
582
    {
583
        int nom, denom, ssize;
584

    
585
        codec = s->streams[i]->codec;
586
        
587
        put_be64(bc, STREAM_STARTCODE);
588
        put_packetheader(nut, bc, 120 + codec->extradata_size, 1);
589
        put_v(bc, i /*s->streams[i]->index*/);
590
        switch(codec->codec_type){
591
        case CODEC_TYPE_VIDEO: put_v(bc, 0); break;
592
        case CODEC_TYPE_AUDIO: put_v(bc, 1); break;
593
//        case CODEC_TYPE_TEXT : put_v(bc, 2); break;
594
        case CODEC_TYPE_DATA : put_v(bc, 3); break;
595
        default: return -1;
596
        }
597
        if (codec->codec_tag)
598
            put_vb(bc, codec->codec_tag);
599
        else if (codec->codec_type == CODEC_TYPE_VIDEO)
600
        {
601
            put_vb(bc, codec_get_bmp_tag(codec->codec_id));
602
        }
603
        else if (codec->codec_type == CODEC_TYPE_AUDIO)
604
        {
605
            put_vb(bc, codec_get_wav_tag(codec->codec_id));
606
        }
607
        else
608
            put_vb(bc, 0);
609
        
610
        ff_parse_specific_params(codec, &nom, &ssize, &denom);
611

    
612
        nut->stream[i].rate_num= nom;
613
        nut->stream[i].rate_den= denom;
614
        av_set_pts_info(s->streams[i], 60, denom, nom);
615

    
616
        put_v(bc, codec->bit_rate);
617
        put_vb(bc, 0); /* no language code */
618
        put_v(bc, nom);
619
        put_v(bc, denom);
620
        if(nom / denom < 1000)
621
            nut->stream[i].msb_timestamp_shift = 7;
622
        else
623
            nut->stream[i].msb_timestamp_shift = 14;
624
        put_v(bc, nut->stream[i].msb_timestamp_shift);
625
        put_v(bc, codec->has_b_frames);
626
        put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
627
        
628
        if(codec->extradata_size){
629
            put_v(bc, 1);
630
            put_v(bc, codec->extradata_size);
631
            put_buffer(bc, codec->extradata, codec->extradata_size);            
632
        }
633
        put_v(bc, 0); /* end of codec specific headers */
634
        
635
        switch(codec->codec_type)
636
        {
637
            case CODEC_TYPE_AUDIO:
638
                put_v(bc, codec->sample_rate);
639
                put_v(bc, 1);
640
                put_v(bc, codec->channels);
641
                break;
642
            case CODEC_TYPE_VIDEO:
643
                put_v(bc, codec->width);
644
                put_v(bc, codec->height);
645
                put_v(bc, codec->sample_aspect_ratio.num);
646
                put_v(bc, codec->sample_aspect_ratio.den);
647
                put_v(bc, 0); /* csp type -- unknown */
648
                break;
649
            default:
650
                break;
651
        }
652
        update_packetheader(nut, bc, 0, 1);
653
    }
654

    
655
    /* info header */
656
    put_be64(bc, INFO_STARTCODE);
657
    put_packetheader(nut, bc, 30+strlen(s->author)+strlen(s->title)+
658
        strlen(s->comment)+strlen(s->copyright)+strlen(LIBAVFORMAT_IDENT), 1); 
659
    if (s->author[0])
660
    {
661
        put_v(bc, 9); /* type */
662
        put_str(bc, s->author);
663
    }
664
    if (s->title[0])
665
    {
666
        put_v(bc, 10); /* type */
667
        put_str(bc, s->title);
668
    }
669
    if (s->comment[0])
670
    {
671
        put_v(bc, 11); /* type */
672
        put_str(bc, s->comment);
673
    }
674
    if (s->copyright[0])
675
    {
676
        put_v(bc, 12); /* type */
677
        put_str(bc, s->copyright);
678
    }
679
    /* encoder */
680
    if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)){
681
        put_v(bc, 13); /* type */
682
        put_str(bc, LIBAVFORMAT_IDENT);
683
    }
684
    
685
    put_v(bc, 0); /* eof info */
686
    update_packetheader(nut, bc, 0, 1);
687
        
688
    put_flush_packet(bc);
689
    
690
    return 0;
691
}
692

    
693
static int64_t lsb2full(StreamContext *stream, int64_t lsb){
694
    int64_t mask = (1<<stream->msb_timestamp_shift)-1;
695
    int64_t delta= stream->last_pts - mask/2;
696
    return  ((lsb - delta)&mask) + delta;
697
}
698

    
699
static int nut_write_packet(AVFormatContext *s, AVPacket *pkt)
700
{
701
    NUTContext *nut = s->priv_data;
702
    StreamContext *stream= &nut->stream[pkt->stream_index];
703
    ByteIOContext *bc = &s->pb;
704
    int key_frame = 0, full_pts=0;
705
    AVCodecContext *enc;
706
    int64_t coded_pts;
707
    int frame_type, best_length, frame_code, flags, i, size_mul, size_lsb, time_delta;
708
    const int64_t frame_start= url_ftell(bc);
709
    int64_t pts= pkt->pts;
710
    int size= pkt->size;
711
    int stream_index= pkt->stream_index;
712

    
713
    enc = s->streams[stream_index]->codec;
714
    key_frame = !!(pkt->flags & PKT_FLAG_KEY);
715
    
716
    frame_type=0;
717
    if(frame_start + size + 20 - FFMAX(nut->packet_start[1], nut->packet_start[2]) > MAX_DISTANCE)
718
        frame_type=2;
719
    if(key_frame && !stream->last_key_frame)
720
        frame_type=2;
721

    
722
    if(frame_type>1){
723
        int64_t global_ts= av_rescale(pts, stream->rate_den*(int64_t)nut->rate_num, stream->rate_num*(int64_t)nut->rate_den);
724
        reset(s, global_ts);
725
        put_be64(bc, KEYFRAME_STARTCODE);
726
        put_v(bc, global_ts);
727
    }
728
    assert(stream->last_pts != AV_NOPTS_VALUE);
729
    coded_pts = pts & ((1<<stream->msb_timestamp_shift)-1);
730
    if(lsb2full(stream, coded_pts) != pts)
731
        full_pts=1;
732

    
733
    if(full_pts)
734
        coded_pts= pts + (1<<stream->msb_timestamp_shift);
735

    
736
    best_length=INT_MAX;
737
    frame_code= -1;
738
    for(i=0; i<256; i++){
739
        int stream_id_plus1= nut->frame_code[i].stream_id_plus1;
740
        int fc_key_frame;
741
        int length=0;
742
        size_mul= nut->frame_code[i].size_mul;
743
        size_lsb= nut->frame_code[i].size_lsb;
744
        time_delta= nut->frame_code[i].timestamp_delta;
745
        flags= nut->frame_code[i].flags;
746

    
747
        assert(size_mul > size_lsb);
748
        
749
        if(stream_id_plus1 == 0) length+= get_length(stream_index);
750
        else if(stream_id_plus1 - 1 != stream_index)
751
            continue;
752
        fc_key_frame= !!(flags & FLAG_KEY_FRAME);
753

    
754
        assert(key_frame==0 || key_frame==1);
755
        if(fc_key_frame != key_frame)
756
            continue;
757

    
758
        if(flags & FLAG_DATA_SIZE){
759
            if(size % size_mul != size_lsb)
760
                continue;
761
            length += get_length(size / size_mul);
762
        }else if(size != size_lsb)
763
            continue;
764

    
765
        if(full_pts && time_delta)
766
            continue;
767
            
768
        if(!time_delta){
769
            length += get_length(coded_pts);
770
        }else{
771
            if(time_delta != pts - stream->last_pts)
772
                continue;
773
        }
774

    
775
        if(length < best_length){
776
            best_length= length;
777
            frame_code=i;
778
        }
779
//    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);
780
    }
781

    
782
    assert(frame_code != -1);
783
    flags= nut->frame_code[frame_code].flags;
784
    size_mul= nut->frame_code[frame_code].size_mul;
785
    size_lsb= nut->frame_code[frame_code].size_lsb;
786
    time_delta= nut->frame_code[frame_code].timestamp_delta;
787
#ifdef TRACE
788
    best_length /= 7;
789
    best_length ++; //frame_code
790
    if(frame_type==2){
791
        best_length += 8; // startcode
792
    }
793
    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);
794
//    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]);
795
#endif
796

    
797
    assert(frame_type != 1); //short startcode not implemented yet
798
    put_byte(bc, frame_code);
799

    
800
    if(nut->frame_code[frame_code].stream_id_plus1 == 0)
801
        put_v(bc, stream_index);
802
    if (!time_delta){
803
        put_v(bc, coded_pts);
804
    }
805
    if(flags & FLAG_DATA_SIZE)
806
        put_v(bc, size / size_mul);
807
    else
808
        assert(size == size_lsb);
809
    if(size > MAX_DISTANCE){
810
        assert(frame_type > 1);
811
    }
812
    
813
    put_buffer(bc, pkt->data, size);
814

    
815
    update(nut, stream_index, frame_start, frame_type, frame_code, key_frame, size, pts);
816
    
817
    return 0;
818
}
819

    
820
static int nut_write_trailer(AVFormatContext *s)
821
{
822
    NUTContext *nut = s->priv_data;
823
    ByteIOContext *bc = &s->pb;
824

    
825
#if 0
826
    int i;
827

828
    /* WRITE INDEX */
829

830
    for (i = 0; s->nb_streams; i++)
831
    {
832
        put_be64(bc, INDEX_STARTCODE);
833
        put_packetheader(nut, bc, 64, 1);
834
        put_v(bc, s->streams[i]->id);
835
        put_v(bc, ...);
836
        update_packetheader(nut, bc, 0, 1);
837
    }
838
#endif
839

    
840
    put_flush_packet(bc);
841
    
842
    av_freep(&nut->stream);
843

    
844
    return 0;
845
}
846
#endif //CONFIG_ENCODERS
847

    
848
static int nut_probe(AVProbeData *p)
849
{
850
    int i;
851
    uint64_t code= 0xff;
852

    
853
    for (i = 0; i < p->buf_size; i++) {
854
        code = (code << 8) | p->buf[i];
855
        if (code == MAIN_STARTCODE)
856
            return AVPROBE_SCORE_MAX;
857
    }
858
    return 0;
859
}
860

    
861
static int decode_main_header(NUTContext *nut){
862
    AVFormatContext *s= nut->avf;
863
    ByteIOContext *bc = &s->pb;
864
    uint64_t tmp;
865
    int i, j, tmp_stream, tmp_mul, tmp_time, tmp_size, count, tmp_res;
866
    
867
    get_packetheader(nut, bc, 1);
868

    
869
    tmp = get_v(bc);
870
    if (tmp != 2){
871
        av_log(s, AV_LOG_ERROR, "bad version (%Ld)\n", tmp);
872
        return -1;
873
    }
874
    
875
    nut->stream_count = get_v(bc);
876
    if(nut->stream_count > MAX_STREAMS){
877
        av_log(s, AV_LOG_ERROR, "too many streams\n");
878
        return -1;
879
    }
880
    nut->max_distance = get_v(bc);
881
    nut->max_short_distance = get_v(bc);
882
    nut->rate_num= get_v(bc);
883
    nut->rate_den= get_v(bc);
884
    nut->short_startcode= get_v(bc);
885
    if(nut->short_startcode>>16 != 'N'){
886
        av_log(s, AV_LOG_ERROR, "invalid short startcode %X\n", nut->short_startcode);
887
        return -1;
888
    }
889
    
890
    for(i=0; i<256;){
891
        int tmp_flags = get_v(bc);
892
        int tmp_fields= get_v(bc);
893
        if(tmp_fields>0) tmp_time  = get_s(bc);
894
        if(tmp_fields>1) tmp_mul   = get_v(bc);
895
        if(tmp_fields>2) tmp_stream= get_v(bc);
896
        if(tmp_fields>3) tmp_size  = get_v(bc);
897
        else             tmp_size  = 0;
898
        if(tmp_fields>4) tmp_res   = get_v(bc);
899
        else             tmp_res   = 0;
900
        if(tmp_fields>5) count     = get_v(bc);
901
        else             count     = tmp_mul - tmp_size;
902
        
903
        while(tmp_fields-- > 6) 
904
           get_v(bc);
905
        
906
        if(count == 0 || i+count > 256){
907
            av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
908
            return -1;
909
        }
910
        if(tmp_stream > nut->stream_count + 1){
911
            av_log(s, AV_LOG_ERROR, "illegal stream number\n");
912
            return -1;
913
        }
914

    
915
        for(j=0; j<count; j++,i++){
916
            nut->frame_code[i].flags           = tmp_flags ;
917
            nut->frame_code[i].timestamp_delta = tmp_time  ;
918
            nut->frame_code[i].stream_id_plus1 = tmp_stream;
919
            nut->frame_code[i].size_mul        = tmp_mul   ;
920
            nut->frame_code[i].size_lsb        = tmp_size+j;
921
            nut->frame_code[i].reserved_count  = tmp_res   ;
922
        }
923
    }
924
    if(nut->frame_code['N'].flags != FLAG_INVALID){
925
        av_log(s, AV_LOG_ERROR, "illegal frame_code table\n");
926
        return -1;
927
    }
928

    
929
    if(check_checksum(bc)){
930
        av_log(s, AV_LOG_ERROR, "Main header checksum mismatch\n");
931
        return -1;
932
    }
933

    
934
    return 0;
935
}
936

    
937
static int decode_stream_header(NUTContext *nut){
938
    AVFormatContext *s= nut->avf;
939
    ByteIOContext *bc = &s->pb;
940
    int class, nom, denom, stream_id;
941
    uint64_t tmp;
942
    AVStream *st;
943
    
944
    get_packetheader(nut, bc, 1);
945
    stream_id= get_v(bc);
946
    if(stream_id >= nut->stream_count || s->streams[stream_id])
947
        return -1;
948
    
949
    st = av_new_stream(s, stream_id);
950
    if (!st)
951
        return AVERROR_NOMEM;
952

    
953
    class = get_v(bc);
954
    tmp = get_vb(bc);
955
    st->codec->codec_tag= tmp;
956
    switch(class)
957
    {
958
        case 0:
959
            st->codec->codec_type = CODEC_TYPE_VIDEO;
960
            st->codec->codec_id = codec_get_bmp_id(tmp);
961
            if (st->codec->codec_id == CODEC_ID_NONE)
962
                av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
963
            break;
964
        case 1:
965
        case 32: //compatibility
966
            st->codec->codec_type = CODEC_TYPE_AUDIO;
967
            st->codec->codec_id = codec_get_wav_id(tmp);
968
            if (st->codec->codec_id == CODEC_ID_NONE)
969
                av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
970
            break;
971
        case 2:
972
//            st->codec->codec_type = CODEC_TYPE_TEXT;
973
//            break;
974
        case 3:
975
            st->codec->codec_type = CODEC_TYPE_DATA;
976
            break;
977
        default:
978
            av_log(s, AV_LOG_ERROR, "Unknown stream class (%d)\n", class);
979
            return -1;
980
    }
981
    s->bit_rate += get_v(bc);
982
    get_vb(bc); /* language code */
983
    nom = get_v(bc);
984
    denom = get_v(bc);
985
    nut->stream[stream_id].msb_timestamp_shift = get_v(bc);
986
    st->codec->has_b_frames=
987
    nut->stream[stream_id].decode_delay= get_v(bc);
988
    get_byte(bc); /* flags */
989

    
990
    /* codec specific data headers */
991
    while(get_v(bc) != 0){
992
        st->codec->extradata_size= get_v(bc);
993
        if((unsigned)st->codec->extradata_size > (1<<30))
994
            return -1;
995
        st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
996
        get_buffer(bc, st->codec->extradata, st->codec->extradata_size);            
997
//            url_fskip(bc, get_v(bc));
998
    }
999
    
1000
    if (st->codec->codec_type == CODEC_TYPE_VIDEO) /* VIDEO */
1001
    {
1002
        st->codec->width = get_v(bc);
1003
        st->codec->height = get_v(bc);
1004
        st->codec->sample_aspect_ratio.num= get_v(bc);
1005
        st->codec->sample_aspect_ratio.den= get_v(bc);
1006
        get_v(bc); /* csp type */
1007
    }
1008
    if (st->codec->codec_type == CODEC_TYPE_AUDIO) /* AUDIO */
1009
    {
1010
        st->codec->sample_rate = get_v(bc);
1011
        get_v(bc); // samplerate_den
1012
        st->codec->channels = get_v(bc);
1013
    }
1014
    if(check_checksum(bc)){
1015
        av_log(s, AV_LOG_ERROR, "Stream header %d checksum mismatch\n", stream_id);
1016
        return -1;
1017
    }
1018
    av_set_pts_info(s->streams[stream_id], 60, denom, nom);
1019
    nut->stream[stream_id].rate_num= nom;
1020
    nut->stream[stream_id].rate_den= denom;
1021
    return 0;
1022
}
1023

    
1024
static int decode_info_header(NUTContext *nut){
1025
    AVFormatContext *s= nut->avf;
1026
    ByteIOContext *bc = &s->pb;
1027
    
1028
    get_packetheader(nut, bc, 1);
1029

    
1030
    for(;;){
1031
        int id= get_v(bc);
1032
        char *name, *type, custom_name[256], custom_type[256];
1033

    
1034
        if(!id)
1035
            break;
1036
        else if(id >= sizeof(info_table)/sizeof(info_table[0])){
1037
            av_log(s, AV_LOG_ERROR, "info id is too large %d %d\n", id, sizeof(info_table)/sizeof(info_table[0]));
1038
            return -1;
1039
        }
1040

    
1041
        type= info_table[id][1];
1042
        name= info_table[id][0];
1043
//av_log(s, AV_LOG_DEBUG, "%d %s %s\n", id, type, name);
1044

    
1045
        if(!type){
1046
            get_str(bc, custom_type, sizeof(custom_type));
1047
            type= custom_type;
1048
        }
1049
        if(!name){
1050
            get_str(bc, custom_name, sizeof(custom_name));
1051
            name= custom_name;
1052
        }
1053
        
1054
        if(!strcmp(type, "v")){
1055
            get_v(bc);
1056
        }else{
1057
            if(!strcmp(name, "Author"))
1058
                get_str(bc, s->author, sizeof(s->author));
1059
            else if(!strcmp(name, "Title"))
1060
                get_str(bc, s->title, sizeof(s->title));
1061
            else if(!strcmp(name, "Copyright"))
1062
                get_str(bc, s->copyright, sizeof(s->copyright));
1063
            else if(!strcmp(name, "Description"))
1064
                get_str(bc, s->comment, sizeof(s->comment));
1065
            else
1066
                get_str(bc, NULL, 0);
1067
        }
1068
    }
1069
    if(check_checksum(bc)){
1070
        av_log(s, AV_LOG_ERROR, "Info header checksum mismatch\n");
1071
        return -1;
1072
    }
1073
    return 0;
1074
}
1075

    
1076
static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
1077
{
1078
    NUTContext *nut = s->priv_data;
1079
    ByteIOContext *bc = &s->pb;
1080
    int64_t pos;
1081
    int inited_stream_count;
1082

    
1083
    nut->avf= s;
1084
    
1085
    /* main header */
1086
    pos=0;
1087
    for(;;){
1088
        pos= find_startcode(bc, MAIN_STARTCODE, pos)+1;
1089
        if (pos<0){
1090
            av_log(s, AV_LOG_ERROR, "no main startcode found\n");
1091
            return -1;
1092
        }
1093
        if(decode_main_header(nut) >= 0)
1094
            break;
1095
    }
1096
    
1097
    
1098
    s->bit_rate = 0;
1099

    
1100
    nut->stream = av_malloc(sizeof(StreamContext)*nut->stream_count);
1101

    
1102
    /* stream headers */
1103
    pos=0;
1104
    for(inited_stream_count=0; inited_stream_count < nut->stream_count;){
1105
        pos= find_startcode(bc, STREAM_STARTCODE, pos)+1;
1106
        if (pos<0+1){
1107
            av_log(s, AV_LOG_ERROR, "not all stream headers found\n");
1108
            return -1;
1109
        }
1110
        if(decode_stream_header(nut) >= 0)
1111
            inited_stream_count++;
1112
    }
1113

    
1114
    /* info headers */
1115
    pos=0;
1116
    for(;;){
1117
        uint64_t startcode= find_any_startcode(bc, pos);
1118
        pos= url_ftell(bc);
1119

    
1120
        if(startcode==0){
1121
            av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
1122
            return -1;
1123
        }else if(startcode == KEYFRAME_STARTCODE){
1124
            nut->next_startcode= startcode;
1125
            break;
1126
        }else if(startcode != INFO_STARTCODE){
1127
            continue;
1128
        }
1129

    
1130
        decode_info_header(nut);
1131
    }
1132

    
1133
    return 0;
1134
}
1135

    
1136
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){
1137
    AVFormatContext *s= nut->avf;
1138
    StreamContext *stream;
1139
    ByteIOContext *bc = &s->pb;
1140
    int size, flags, size_mul, size_lsb, stream_id, time_delta;
1141
    int64_t pts = 0;
1142

    
1143
    if(frame_type < 2 && frame_start - nut->packet_start[2] > nut->max_distance){
1144
        av_log(s, AV_LOG_ERROR, "last frame must have been damaged\n");
1145
        return -1;
1146
    }
1147

    
1148
    if(frame_type)
1149
        nut->packet_start[ frame_type ]= frame_start; //otherwise 1 goto 1 may happen
1150
    
1151
    flags= nut->frame_code[frame_code].flags;
1152
    size_mul= nut->frame_code[frame_code].size_mul;
1153
    size_lsb= nut->frame_code[frame_code].size_lsb;
1154
    stream_id= nut->frame_code[frame_code].stream_id_plus1 - 1;
1155
    time_delta= nut->frame_code[frame_code].timestamp_delta;
1156
    
1157
    if(stream_id==-1)
1158
        stream_id= get_v(bc);
1159
    if(stream_id >= s->nb_streams){
1160
        av_log(s, AV_LOG_ERROR, "illegal stream_id\n");
1161
        return -1;
1162
    }
1163
    stream= &nut->stream[stream_id];
1164

    
1165
//    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]);
1166

    
1167
    *key_frame_ret= !!(flags & FLAG_KEY_FRAME);
1168

    
1169
    if(!time_delta){
1170
        int64_t mask = (1<<stream->msb_timestamp_shift)-1;
1171
        pts= get_v(bc);
1172
        if(pts > mask){
1173
            pts -= mask+1;
1174
        }else{
1175
            if(stream->last_pts == AV_NOPTS_VALUE){
1176
                av_log(s, AV_LOG_ERROR, "no reference pts available\n");
1177
                return -1;
1178
            }
1179
            pts= lsb2full(stream, pts);
1180
        }
1181
    }else{
1182
        if(stream->last_pts == AV_NOPTS_VALUE){
1183
            av_log(s, AV_LOG_ERROR, "no reference pts available\n");
1184
            return -1;
1185
        }
1186
        pts= stream->last_pts + time_delta;
1187
    }
1188

    
1189
    if(*key_frame_ret){
1190
//        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);
1191
        av_add_index_entry(
1192
            s->streams[stream_id], 
1193
            frame_start, 
1194
            pts, 
1195
            frame_start - nut->stream[stream_id].last_sync_pos,
1196
            AVINDEX_KEYFRAME);
1197
        nut->stream[stream_id].last_sync_pos= frame_start;
1198
//                assert(nut->packet_start == frame_start);
1199
    }
1200

    
1201
    assert(size_mul > size_lsb);
1202
    size= size_lsb;
1203
    if(flags & FLAG_DATA_SIZE)
1204
        size+= size_mul*get_v(bc);
1205
      
1206
#ifdef TRACE
1207
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);
1208
#endif
1209

    
1210
    if(frame_type==0 && url_ftell(bc) - nut->packet_start[2] + size > nut->max_distance){
1211
        av_log(s, AV_LOG_ERROR, "frame size too large\n");
1212
        return -1;
1213
    }
1214
    
1215
    *stream_id_ret = stream_id;
1216
    *pts_ret = pts;
1217

    
1218
    update(nut, stream_id, frame_start, frame_type, frame_code, *key_frame_ret, size, pts);
1219

    
1220
    return size;
1221
}
1222

    
1223
static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code, int frame_type, int64_t frame_start){
1224
    AVFormatContext *s= nut->avf;
1225
    ByteIOContext *bc = &s->pb;
1226
    int size, stream_id, key_frame, discard;
1227
    int64_t pts, last_IP_pts;
1228
    
1229
    size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type, frame_start);
1230
    if(size < 0)
1231
        return -1;
1232

    
1233
    discard= s->streams[ stream_id ]->discard;
1234
    last_IP_pts= s->streams[ stream_id ]->last_IP_pts;
1235
    if(  (discard >= AVDISCARD_NONKEY && !key_frame)
1236
       ||(discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE && last_IP_pts > pts)
1237
       || discard >= AVDISCARD_ALL){
1238
        url_fskip(bc, size);
1239
        return 1;
1240
    }
1241

    
1242
    av_get_packet(bc, pkt, 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, SEEK_CUR);
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, SEEK_CUR);
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
    .flags = AVFMT_GLOBALHEADER,
1452
};
1453
#endif //CONFIG_ENCODERS
1454

    
1455
int nut_init(void)
1456
{
1457
    av_register_input_format(&nut_iformat);
1458
#ifdef CONFIG_ENCODERS
1459
    av_register_output_format(&nut_oformat);
1460
#endif //CONFIG_ENCODERS
1461
    return 0;
1462
}