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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19
 *
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;
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    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;
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    int64_t last_pts;
75
    int64_t last_sync_pos;                    ///<pos of last 1/2 type frame
76
    int decode_delay;
77
} StreamContext;
78

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

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

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

    
116
static void update(NUTContext *nut, int stream_index, int64_t frame_start, int frame_type, int frame_code, int key_frame, int size, int64_t pts){
117
    StreamContext *stream= &nut->stream[stream_index];
118

    
119
    stream->last_key_frame= key_frame;
120
    nut->packet_start[ frame_type ]= frame_start;
121
    stream->last_pts= pts;
122
}
123

    
124
static void reset(AVFormatContext *s, int64_t global_ts){
125
    NUTContext *nut = s->priv_data;
126
    int i;
127

    
128
    for(i=0; i<s->nb_streams; i++){
129
        StreamContext *stream= &nut->stream[i];
130

    
131
        stream->last_key_frame= 1;
132

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

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

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

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

    
163
        for(key_frame=0; key_frame<2; key_frame++){
164
            if(intra_only && keyframe_0_esc && key_frame==0)
165
                continue;
166

    
167
            {
168
                FrameCode *ft= &nut->frame_code[start2];
169
                ft->flags= FLAG_KEY_FRAME*key_frame;
170
                ft->flags|= FLAG_DATA_SIZE;
171
                ft->stream_id_plus1= stream_id + 1;
172
                ft->size_mul=1;
173
                ft->timestamp_delta=0;
174
                start2++;
175
            }
176
        }
177

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

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

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

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

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

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

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

    
259
static int get_str(ByteIOContext *bc, char *string, unsigned int maxlen){
260
    unsigned int len= get_v(bc);
261

    
262
    if(len && maxlen)
263
        get_buffer(bc, string, FFMIN(len, maxlen));
264
    while(len > maxlen){
265
        get_byte(bc);
266
        len--;
267
    }
268

    
269
    if(maxlen)
270
        string[FFMIN(len, maxlen-1)]= 0;
271

    
272
    if(maxlen == len)
273
        return -1;
274
    else
275
        return 0;
276
}
277

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

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

    
285
static uint64_t get_vb(ByteIOContext *bc){
286
    uint64_t val=0;
287
    unsigned int i= get_v(bc);
288

    
289
    if(i>8)
290
        return UINT64_MAX;
291

    
292
    while(i--)
293
        val = (val<<8) + get_byte(bc);
294

    
295
//av_log(NULL, AV_LOG_DEBUG, "get_vb()= %lld\n", val);
296
    return val;
297
}
298

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

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

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

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

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

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

    
325

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

    
331
    size= get_v(bc);
332

    
333
    init_checksum(bc, calculate_checksum ? update_adler32 : NULL, 0);
334

    
335
    nut->packet_start[2] = start;
336
    nut->written_packet_size= size;
337

    
338
    return size;
339
}
340

    
341
static int check_checksum(ByteIOContext *bc){
342
    unsigned long checksum= get_checksum(bc);
343
    return checksum != get_be32(bc);
344
}
345

    
346
/**
347
 *
348
 */
349
static int get_length(uint64_t val){
350
    int i;
351

    
352
    for (i=7; val>>i; i+=7);
353

    
354
    return i;
355
}
356

    
357
static uint64_t find_any_startcode(ByteIOContext *bc, int64_t pos){
358
    uint64_t state=0;
359

    
360
    if(pos >= 0)
361
        url_fseek(bc, pos, SEEK_SET); //note, this may fail if the stream isnt seekable, but that shouldnt matter, as in this case we simply start where we are currently
362

    
363
    while(!url_feof(bc)){
364
        state= (state<<8) | get_byte(bc);
365
        if((state>>56) != 'N')
366
            continue;
367
        switch(state){
368
        case MAIN_STARTCODE:
369
        case STREAM_STARTCODE:
370
        case KEYFRAME_STARTCODE:
371
        case INFO_STARTCODE:
372
        case INDEX_STARTCODE:
373
            return state;
374
        }
375
    }
376

    
377
    return 0;
378
}
379

    
380
/**
381
 * find the given startcode.
382
 * @param code the startcode
383
 * @param pos the start position of the search, or -1 if the current position
384
 * @returns the position of the startcode or -1 if not found
385
 */
386
static int64_t find_startcode(ByteIOContext *bc, uint64_t code, int64_t pos){
387
    for(;;){
388
        uint64_t startcode= find_any_startcode(bc, pos);
389
        if(startcode == code)
390
            return url_ftell(bc) - 8;
391
        else if(startcode == 0)
392
            return -1;
393
        pos=-1;
394
    }
395
}
396

    
397
static int64_t lsb2full(StreamContext *stream, int64_t lsb){
398
    int64_t mask = (1<<stream->msb_timestamp_shift)-1;
399
    int64_t delta= stream->last_pts - mask/2;
400
    return  ((lsb - delta)&mask) + delta;
401
}
402

    
403
#ifdef CONFIG_MUXERS
404

    
405
static void put_v(ByteIOContext *bc, uint64_t val)
406
{
407
    int i;
408

    
409
//av_log(NULL, AV_LOG_DEBUG, "put_v()= %lld\n", val);
410
    val &= 0x7FFFFFFFFFFFFFFFULL; // FIXME can only encode upto 63 bits currently
411
    i= get_length(val);
412

    
413
    for (i-=7; i>0; i-=7){
414
        put_byte(bc, 0x80 | (val>>i));
415
    }
416

    
417
    put_byte(bc, val&0x7f);
418
}
419

    
420
/**
421
 * stores a string as vb.
422
 */
423
static void put_str(ByteIOContext *bc, const char *string){
424
    int len= strlen(string);
425

    
426
    put_v(bc, len);
427
    put_buffer(bc, string, len);
428
}
429

    
430
static void put_s(ByteIOContext *bc, int64_t val){
431
    if (val<=0) put_v(bc, -2*val  );
432
    else        put_v(bc,  2*val-1);
433
}
434

    
435
static void put_vb(ByteIOContext *bc, uint64_t val){
436
    int i;
437

    
438
    for (i=8; val>>i; i+=8);
439

    
440
    put_v(bc, i>>3);
441
    for(i-=8; i>=0; i-=8)
442
        put_byte(bc, (val>>i)&0xFF);
443
}
444

    
445
#ifdef TRACE
446
static inline void put_v_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
447
    printf("get_v %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
448

    
449
    put_v(bc, v);
450
}
451

    
452
static inline void put_s_trace(ByteIOContext *bc, int64_t v, char *file, char *func, int line){
453
    printf("get_s %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
454

    
455
    put_s(bc, v);
456
}
457

    
458
static inline void put_vb_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
459
    printf("get_vb %5lld / %llX in %s %s:%d\n", v, v, file, func, line);
460

    
461
    put_vb(bc, v);
462
}
463
#define put_v(bc, v)  put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
464
#define put_s(bc, v)  put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
465
#define put_vb(bc, v)  put_vb_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
466
#endif
467

    
468
static int put_packetheader(NUTContext *nut, ByteIOContext *bc, int max_size, int calculate_checksum)
469
{
470
    put_flush_packet(bc);
471
    nut->packet_start[2]= url_ftell(bc) - 8;
472
    nut->written_packet_size = max_size;
473

    
474
    /* packet header */
475
    put_v(bc, nut->written_packet_size); /* forward ptr */
476

    
477
    if(calculate_checksum)
478
        init_checksum(bc, update_adler32, 0);
479

    
480
    return 0;
481
}
482

    
483
/**
484
 *
485
 * must not be called more then once per packet
486
 */
487
static int update_packetheader(NUTContext *nut, ByteIOContext *bc, int additional_size, int calculate_checksum){
488
    int64_t start= nut->packet_start[2];
489
    int64_t cur= url_ftell(bc);
490
    int size= cur - start - get_length(nut->written_packet_size)/7 - 8;
491

    
492
    if(calculate_checksum)
493
        size += 4;
494

    
495
    if(size != nut->written_packet_size){
496
        int i;
497

    
498
        assert( size <= nut->written_packet_size );
499

    
500
        url_fseek(bc, start + 8, SEEK_SET);
501
        for(i=get_length(size); i < get_length(nut->written_packet_size); i+=7)
502
            put_byte(bc, 0x80);
503
        put_v(bc, size);
504

    
505
        url_fseek(bc, cur, SEEK_SET);
506
        nut->written_packet_size= size; //FIXME may fail if multiple updates with differing sizes, as get_length may differ
507

    
508
        if(calculate_checksum)
509
            put_be32(bc, get_checksum(bc));
510
    }
511

    
512
    return 0;
513
}
514

    
515
static int nut_write_header(AVFormatContext *s)
516
{
517
    NUTContext *nut = s->priv_data;
518
    ByteIOContext *bc = &s->pb;
519
    AVCodecContext *codec;
520
    int i, j, tmp_time, tmp_flags,tmp_stream, tmp_mul, tmp_size, tmp_fields;
521

    
522
    if (strcmp(s->filename, "./data/b-libav.nut")) {
523
        av_log(s, AV_LOG_ERROR, " libavformat NUT is non-compliant and disabled\n");
524
        return -1;
525
    }
526

    
527
    nut->avf= s;
528

    
529
    nut->stream =
530
        av_mallocz(sizeof(StreamContext)*s->nb_streams);
531

    
532

    
533
    put_buffer(bc, ID_STRING, strlen(ID_STRING));
534
    put_byte(bc, 0);
535
    nut->packet_start[2]= url_ftell(bc);
536

    
537
    /* main header */
538
    put_be64(bc, MAIN_STARTCODE);
539
    put_packetheader(nut, bc, 120+5*256, 1);
540
    put_v(bc, 2); /* version */
541
    put_v(bc, s->nb_streams);
542
    put_v(bc, MAX_DISTANCE);
543
    put_v(bc, MAX_SHORT_DISTANCE);
544

    
545
    put_v(bc, nut->rate_num=1);
546
    put_v(bc, nut->rate_den=2);
547
    put_v(bc, nut->short_startcode=0x4EFE79);
548

    
549
    build_frame_code(s);
550
    assert(nut->frame_code['N'].flags == FLAG_INVALID);
551

    
552
    tmp_time= tmp_flags= tmp_stream= tmp_mul= tmp_size= /*tmp_res=*/ INT_MAX;
553
    for(i=0; i<256;){
554
        tmp_fields=0;
555
        tmp_size= 0;
556
        if(tmp_time   != nut->frame_code[i].timestamp_delta) tmp_fields=1;
557
        if(tmp_mul    != nut->frame_code[i].size_mul       ) tmp_fields=2;
558
        if(tmp_stream != nut->frame_code[i].stream_id_plus1) tmp_fields=3;
559
        if(tmp_size   != nut->frame_code[i].size_lsb       ) tmp_fields=4;
560
//        if(tmp_res    != nut->frame_code[i].res            ) tmp_fields=5;
561

    
562
        tmp_time  = nut->frame_code[i].timestamp_delta;
563
        tmp_flags = nut->frame_code[i].flags;
564
        tmp_stream= nut->frame_code[i].stream_id_plus1;
565
        tmp_mul   = nut->frame_code[i].size_mul;
566
        tmp_size  = nut->frame_code[i].size_lsb;
567
//        tmp_res   = nut->frame_code[i].res;
568

    
569
        for(j=0; i<256; j++,i++){
570
            if(nut->frame_code[i].timestamp_delta != tmp_time  ) break;
571
            if(nut->frame_code[i].flags           != tmp_flags ) break;
572
            if(nut->frame_code[i].stream_id_plus1 != tmp_stream) break;
573
            if(nut->frame_code[i].size_mul        != tmp_mul   ) break;
574
            if(nut->frame_code[i].size_lsb        != tmp_size+j) break;
575
//            if(nut->frame_code[i].res             != tmp_res   ) break;
576
        }
577
        if(j != tmp_mul - tmp_size) tmp_fields=6;
578

    
579
        put_v(bc, tmp_flags);
580
        put_v(bc, tmp_fields);
581
        if(tmp_fields>0) put_s(bc, tmp_time);
582
        if(tmp_fields>1) put_v(bc, tmp_mul);
583
        if(tmp_fields>2) put_v(bc, tmp_stream);
584
        if(tmp_fields>3) put_v(bc, tmp_size);
585
        if(tmp_fields>4) put_v(bc, 0 /*tmp_res*/);
586
        if(tmp_fields>5) put_v(bc, j);
587
    }
588

    
589
    update_packetheader(nut, bc, 0, 1);
590

    
591
    /* stream headers */
592
    for (i = 0; i < s->nb_streams; i++)
593
    {
594
        int nom, denom, ssize;
595

    
596
        codec = s->streams[i]->codec;
597

    
598
        put_be64(bc, STREAM_STARTCODE);
599
        put_packetheader(nut, bc, 120 + codec->extradata_size, 1);
600
        put_v(bc, i /*s->streams[i]->index*/);
601
        switch(codec->codec_type){
602
        case CODEC_TYPE_VIDEO: put_v(bc, 0); break;
603
        case CODEC_TYPE_AUDIO: put_v(bc, 1); break;
604
//        case CODEC_TYPE_TEXT : put_v(bc, 2); break;
605
        case CODEC_TYPE_DATA : put_v(bc, 3); break;
606
        default: return -1;
607
        }
608
        if (codec->codec_tag)
609
            put_vb(bc, codec->codec_tag);
610
        else if (codec->codec_type == CODEC_TYPE_VIDEO)
611
        {
612
            put_vb(bc, codec_get_bmp_tag(codec->codec_id));
613
        }
614
        else if (codec->codec_type == CODEC_TYPE_AUDIO)
615
        {
616
            put_vb(bc, codec_get_wav_tag(codec->codec_id));
617
        }
618
        else
619
            put_vb(bc, 0);
620

    
621
        ff_parse_specific_params(codec, &nom, &ssize, &denom);
622

    
623
        nut->stream[i].rate_num= nom;
624
        nut->stream[i].rate_den= denom;
625
        av_set_pts_info(s->streams[i], 60, denom, nom);
626

    
627
        put_v(bc, codec->bit_rate);
628
        put_vb(bc, 0); /* no language code */
629
        put_v(bc, nom);
630
        put_v(bc, denom);
631
        if(nom / denom < 1000)
632
            nut->stream[i].msb_timestamp_shift = 7;
633
        else
634
            nut->stream[i].msb_timestamp_shift = 14;
635
        put_v(bc, nut->stream[i].msb_timestamp_shift);
636
        put_v(bc, codec->has_b_frames);
637
        put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
638

    
639
        if(codec->extradata_size){
640
            put_v(bc, 1);
641
            put_v(bc, codec->extradata_size);
642
            put_buffer(bc, codec->extradata, codec->extradata_size);
643
        }
644
        put_v(bc, 0); /* end of codec specific headers */
645

    
646
        switch(codec->codec_type)
647
        {
648
            case CODEC_TYPE_AUDIO:
649
                put_v(bc, codec->sample_rate);
650
                put_v(bc, 1);
651
                put_v(bc, codec->channels);
652
                break;
653
            case CODEC_TYPE_VIDEO:
654
                put_v(bc, codec->width);
655
                put_v(bc, codec->height);
656
                put_v(bc, codec->sample_aspect_ratio.num);
657
                put_v(bc, codec->sample_aspect_ratio.den);
658
                put_v(bc, 0); /* csp type -- unknown */
659
                break;
660
            default:
661
                break;
662
        }
663
        update_packetheader(nut, bc, 0, 1);
664
    }
665

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

    
696
    put_v(bc, 0); /* eof info */
697
    update_packetheader(nut, bc, 0, 1);
698

    
699
    put_flush_packet(bc);
700

    
701
    return 0;
702
}
703

    
704
static int nut_write_packet(AVFormatContext *s, AVPacket *pkt)
705
{
706
    NUTContext *nut = s->priv_data;
707
    StreamContext *stream= &nut->stream[pkt->stream_index];
708
    ByteIOContext *bc = &s->pb;
709
    int key_frame = 0, full_pts=0;
710
    AVCodecContext *enc;
711
    int64_t coded_pts;
712
    int frame_type, best_length, frame_code, flags, i, size_mul, size_lsb, time_delta;
713
    const int64_t frame_start= url_ftell(bc);
714
    int64_t pts= pkt->pts;
715
    int size= pkt->size;
716
    int stream_index= pkt->stream_index;
717

    
718
    enc = s->streams[stream_index]->codec;
719
    key_frame = !!(pkt->flags & PKT_FLAG_KEY);
720

    
721
    frame_type=0;
722
    if(frame_start + size + 20 - FFMAX(nut->packet_start[1], nut->packet_start[2]) > MAX_DISTANCE)
723
        frame_type=2;
724
    if(key_frame && !stream->last_key_frame)
725
        frame_type=2;
726

    
727
    if(frame_type>1){
728
        int64_t global_ts= av_rescale(pts, stream->rate_den*(int64_t)nut->rate_num, stream->rate_num*(int64_t)nut->rate_den);
729
        reset(s, global_ts);
730
        put_be64(bc, KEYFRAME_STARTCODE);
731
        put_v(bc, global_ts);
732
    }
733
    assert(stream->last_pts != AV_NOPTS_VALUE);
734
    coded_pts = pts & ((1<<stream->msb_timestamp_shift)-1);
735
    if(lsb2full(stream, coded_pts) != pts)
736
        full_pts=1;
737

    
738
    if(full_pts)
739
        coded_pts= pts + (1<<stream->msb_timestamp_shift);
740

    
741
    best_length=INT_MAX;
742
    frame_code= -1;
743
    for(i=0; i<256; i++){
744
        int stream_id_plus1= nut->frame_code[i].stream_id_plus1;
745
        int fc_key_frame;
746
        int length=0;
747
        size_mul= nut->frame_code[i].size_mul;
748
        size_lsb= nut->frame_code[i].size_lsb;
749
        time_delta= nut->frame_code[i].timestamp_delta;
750
        flags= nut->frame_code[i].flags;
751

    
752
        assert(size_mul > size_lsb);
753

    
754
        if(stream_id_plus1 == 0) length+= get_length(stream_index);
755
        else if(stream_id_plus1 - 1 != stream_index)
756
            continue;
757
        fc_key_frame= !!(flags & FLAG_KEY_FRAME);
758

    
759
        assert(key_frame==0 || key_frame==1);
760
        if(fc_key_frame != key_frame)
761
            continue;
762

    
763
        if(flags & FLAG_DATA_SIZE){
764
            if(size % size_mul != size_lsb)
765
                continue;
766
            length += get_length(size / size_mul);
767
        }else if(size != size_lsb)
768
            continue;
769

    
770
        if(full_pts && time_delta)
771
            continue;
772

    
773
        if(!time_delta){
774
            length += get_length(coded_pts);
775
        }else{
776
            if(time_delta != pts - stream->last_pts)
777
                continue;
778
        }
779

    
780
        if(length < best_length){
781
            best_length= length;
782
            frame_code=i;
783
        }
784
//    av_log(s, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d %d %d\n", key_frame, frame_type, full_pts, size, stream_index, flags, size_mul, size_lsb, stream_id_plus1, length);
785
    }
786

    
787
    assert(frame_code != -1);
788
    flags= nut->frame_code[frame_code].flags;
789
    size_mul= nut->frame_code[frame_code].size_mul;
790
    size_lsb= nut->frame_code[frame_code].size_lsb;
791
    time_delta= nut->frame_code[frame_code].timestamp_delta;
792
#ifdef TRACE
793
    best_length /= 7;
794
    best_length ++; //frame_code
795
    if(frame_type==2){
796
        best_length += 8; // startcode
797
    }
798
    av_log(s, AV_LOG_DEBUG, "kf:%d ft:%d pt:%d fc:%2X len:%2d size:%d stream:%d flag:%d mul:%d lsb:%d s+1:%d pts_delta:%d pts:%lld fs:%lld\n", key_frame, frame_type, full_pts ? 1 : 0, frame_code, best_length, size, stream_index, flags, size_mul, size_lsb, nut->frame_code[frame_code].stream_id_plus1,(int)(pts - stream->last_pts), pts, frame_start);
799
//    av_log(s, AV_LOG_DEBUG, "%d %d %d\n", stream->lru_pts_delta[0], stream->lru_pts_delta[1], stream->lru_pts_delta[2]);
800
#endif
801

    
802
    assert(frame_type != 1); //short startcode not implemented yet
803
    put_byte(bc, frame_code);
804

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

    
818
    put_buffer(bc, pkt->data, size);
819

    
820
    update(nut, stream_index, frame_start, frame_type, frame_code, key_frame, size, pts);
821

    
822
    return 0;
823
}
824

    
825
static int nut_write_trailer(AVFormatContext *s)
826
{
827
    NUTContext *nut = s->priv_data;
828
    ByteIOContext *bc = &s->pb;
829

    
830
#if 0
831
    int i;
832

833
    /* WRITE INDEX */
834

835
    for (i = 0; s->nb_streams; i++)
836
    {
837
        put_be64(bc, INDEX_STARTCODE);
838
        put_packetheader(nut, bc, 64, 1);
839
        put_v(bc, s->streams[i]->id);
840
        put_v(bc, ...);
841
        update_packetheader(nut, bc, 0, 1);
842
    }
843
#endif
844

    
845
    put_flush_packet(bc);
846

    
847
    av_freep(&nut->stream);
848

    
849
    return 0;
850
}
851
#endif //CONFIG_MUXERS
852

    
853
static int nut_probe(AVProbeData *p)
854
{
855
    int i;
856
    uint64_t code= 0xff;
857

    
858
    for (i = 0; i < p->buf_size; i++) {
859
        code = (code << 8) | p->buf[i];
860
        if (code == MAIN_STARTCODE)
861
            return AVPROBE_SCORE_MAX;
862
    }
863
    return 0;
864
}
865

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

    
872
    get_packetheader(nut, bc, 1);
873

    
874
    tmp = get_v(bc);
875
    if (tmp != 2){
876
        av_log(s, AV_LOG_ERROR, "bad version (%"PRId64")\n", tmp);
877
        return -1;
878
    }
879

    
880
    nut->stream_count = get_v(bc);
881
    if(nut->stream_count > MAX_STREAMS){
882
        av_log(s, AV_LOG_ERROR, "too many streams\n");
883
        return -1;
884
    }
885
    nut->max_distance = get_v(bc);
886
    nut->max_short_distance = get_v(bc);
887
    nut->rate_num= get_v(bc);
888
    nut->rate_den= get_v(bc);
889
    nut->short_startcode= get_v(bc);
890
    if(nut->short_startcode>>16 != 'N'){
891
        av_log(s, AV_LOG_ERROR, "invalid short startcode %X\n", nut->short_startcode);
892
        return -1;
893
    }
894

    
895
    for(i=0; i<256;){
896
        int tmp_flags = get_v(bc);
897
        int tmp_fields= get_v(bc);
898
        if(tmp_fields>0) tmp_time  = get_s(bc);
899
        if(tmp_fields>1) tmp_mul   = get_v(bc);
900
        if(tmp_fields>2) tmp_stream= get_v(bc);
901
        if(tmp_fields>3) tmp_size  = get_v(bc);
902
        else             tmp_size  = 0;
903
        if(tmp_fields>4) tmp_res   = get_v(bc);
904
        else             tmp_res   = 0;
905
        if(tmp_fields>5) count     = get_v(bc);
906
        else             count     = tmp_mul - tmp_size;
907

    
908
        while(tmp_fields-- > 6)
909
           get_v(bc);
910

    
911
        if(count == 0 || i+count > 256){
912
            av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
913
            return -1;
914
        }
915
        if(tmp_stream > nut->stream_count + 1){
916
            av_log(s, AV_LOG_ERROR, "illegal stream number\n");
917
            return -1;
918
        }
919

    
920
        for(j=0; j<count; j++,i++){
921
            nut->frame_code[i].flags           = tmp_flags ;
922
            nut->frame_code[i].timestamp_delta = tmp_time  ;
923
            nut->frame_code[i].stream_id_plus1 = tmp_stream;
924
            nut->frame_code[i].size_mul        = tmp_mul   ;
925
            nut->frame_code[i].size_lsb        = tmp_size+j;
926
            nut->frame_code[i].reserved_count  = tmp_res   ;
927
        }
928
    }
929
    if(nut->frame_code['N'].flags != FLAG_INVALID){
930
        av_log(s, AV_LOG_ERROR, "illegal frame_code table\n");
931
        return -1;
932
    }
933

    
934
    if(check_checksum(bc)){
935
        av_log(s, AV_LOG_ERROR, "Main header checksum mismatch\n");
936
        return -1;
937
    }
938

    
939
    return 0;
940
}
941

    
942
static int decode_stream_header(NUTContext *nut){
943
    AVFormatContext *s= nut->avf;
944
    ByteIOContext *bc = &s->pb;
945
    int class, nom, denom, stream_id;
946
    uint64_t tmp;
947
    AVStream *st;
948

    
949
    get_packetheader(nut, bc, 1);
950
    stream_id= get_v(bc);
951
    if(stream_id >= nut->stream_count || s->streams[stream_id])
952
        return -1;
953

    
954
    st = av_new_stream(s, stream_id);
955
    if (!st)
956
        return AVERROR_NOMEM;
957

    
958
    class = get_v(bc);
959
    tmp = get_vb(bc);
960
    st->codec->codec_tag= tmp;
961
    switch(class)
962
    {
963
        case 0:
964
            st->codec->codec_type = CODEC_TYPE_VIDEO;
965
            st->codec->codec_id = codec_get_bmp_id(tmp);
966
            if (st->codec->codec_id == CODEC_ID_NONE)
967
                av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
968
            break;
969
        case 1:
970
        case 32: //compatibility
971
            st->codec->codec_type = CODEC_TYPE_AUDIO;
972
            st->codec->codec_id = codec_get_wav_id(tmp);
973
            if (st->codec->codec_id == CODEC_ID_NONE)
974
                av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
975
            break;
976
        case 2:
977
//            st->codec->codec_type = CODEC_TYPE_TEXT;
978
//            break;
979
        case 3:
980
            st->codec->codec_type = CODEC_TYPE_DATA;
981
            break;
982
        default:
983
            av_log(s, AV_LOG_ERROR, "Unknown stream class (%d)\n", class);
984
            return -1;
985
    }
986
    s->bit_rate += get_v(bc);
987
    get_vb(bc); /* language code */
988
    nom = get_v(bc);
989
    denom = get_v(bc);
990
    nut->stream[stream_id].msb_timestamp_shift = get_v(bc);
991
    st->codec->has_b_frames=
992
    nut->stream[stream_id].decode_delay= get_v(bc);
993
    get_byte(bc); /* flags */
994

    
995
    /* codec specific data headers */
996
    while(get_v(bc) != 0){
997
        st->codec->extradata_size= get_v(bc);
998
        if((unsigned)st->codec->extradata_size > (1<<30))
999
            return -1;
1000
        st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
1001
        get_buffer(bc, st->codec->extradata, st->codec->extradata_size);
1002
//            url_fskip(bc, get_v(bc));
1003
    }
1004

    
1005
    if (st->codec->codec_type == CODEC_TYPE_VIDEO) /* VIDEO */
1006
    {
1007
        st->codec->width = get_v(bc);
1008
        st->codec->height = get_v(bc);
1009
        st->codec->sample_aspect_ratio.num= get_v(bc);
1010
        st->codec->sample_aspect_ratio.den= get_v(bc);
1011
        get_v(bc); /* csp type */
1012
    }
1013
    if (st->codec->codec_type == CODEC_TYPE_AUDIO) /* AUDIO */
1014
    {
1015
        st->codec->sample_rate = get_v(bc);
1016
        get_v(bc); // samplerate_den
1017
        st->codec->channels = get_v(bc);
1018
    }
1019
    if(check_checksum(bc)){
1020
        av_log(s, AV_LOG_ERROR, "Stream header %d checksum mismatch\n", stream_id);
1021
        return -1;
1022
    }
1023
    av_set_pts_info(s->streams[stream_id], 60, denom, nom);
1024
    nut->stream[stream_id].rate_num= nom;
1025
    nut->stream[stream_id].rate_den= denom;
1026
    return 0;
1027
}
1028

    
1029
static int decode_info_header(NUTContext *nut){
1030
    AVFormatContext *s= nut->avf;
1031
    ByteIOContext *bc = &s->pb;
1032

    
1033
    get_packetheader(nut, bc, 1);
1034

    
1035
    for(;;){
1036
        int id= get_v(bc);
1037
        char *name, *type, custom_name[256], custom_type[256];
1038

    
1039
        if(!id)
1040
            break;
1041
        else if(id >= sizeof(info_table)/sizeof(info_table[0])){
1042
            av_log(s, AV_LOG_ERROR, "info id is too large %d %zd\n", id, sizeof(info_table)/sizeof(info_table[0]));
1043
            return -1;
1044
        }
1045

    
1046
        type= info_table[id][1];
1047
        name= info_table[id][0];
1048
//av_log(s, AV_LOG_DEBUG, "%d %s %s\n", id, type, name);
1049

    
1050
        if(!type){
1051
            get_str(bc, custom_type, sizeof(custom_type));
1052
            type= custom_type;
1053
        }
1054
        if(!name){
1055
            get_str(bc, custom_name, sizeof(custom_name));
1056
            name= custom_name;
1057
        }
1058

    
1059
        if(!strcmp(type, "v")){
1060
            get_v(bc);
1061
        }else{
1062
            if(!strcmp(name, "Author"))
1063
                get_str(bc, s->author, sizeof(s->author));
1064
            else if(!strcmp(name, "Title"))
1065
                get_str(bc, s->title, sizeof(s->title));
1066
            else if(!strcmp(name, "Copyright"))
1067
                get_str(bc, s->copyright, sizeof(s->copyright));
1068
            else if(!strcmp(name, "Description"))
1069
                get_str(bc, s->comment, sizeof(s->comment));
1070
            else
1071
                get_str(bc, NULL, 0);
1072
        }
1073
    }
1074
    if(check_checksum(bc)){
1075
        av_log(s, AV_LOG_ERROR, "Info header checksum mismatch\n");
1076
        return -1;
1077
    }
1078
    return 0;
1079
}
1080

    
1081
static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
1082
{
1083
    NUTContext *nut = s->priv_data;
1084
    ByteIOContext *bc = &s->pb;
1085
    int64_t pos;
1086
    int inited_stream_count;
1087

    
1088
    nut->avf= s;
1089

    
1090
    /* main header */
1091
    pos=0;
1092
    for(;;){
1093
        pos= find_startcode(bc, MAIN_STARTCODE, pos)+1;
1094
        if (pos<0){
1095
            av_log(s, AV_LOG_ERROR, "no main startcode found\n");
1096
            return -1;
1097
        }
1098
        if(decode_main_header(nut) >= 0)
1099
            break;
1100
    }
1101

    
1102

    
1103
    s->bit_rate = 0;
1104

    
1105
    nut->stream = av_malloc(sizeof(StreamContext)*nut->stream_count);
1106

    
1107
    /* stream headers */
1108
    pos=0;
1109
    for(inited_stream_count=0; inited_stream_count < nut->stream_count;){
1110
        pos= find_startcode(bc, STREAM_STARTCODE, pos)+1;
1111
        if (pos<0+1){
1112
            av_log(s, AV_LOG_ERROR, "not all stream headers found\n");
1113
            return -1;
1114
        }
1115
        if(decode_stream_header(nut) >= 0)
1116
            inited_stream_count++;
1117
    }
1118

    
1119
    /* info headers */
1120
    pos=0;
1121
    for(;;){
1122
        uint64_t startcode= find_any_startcode(bc, pos);
1123
        pos= url_ftell(bc);
1124

    
1125
        if(startcode==0){
1126
            av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
1127
            return -1;
1128
        }else if(startcode == KEYFRAME_STARTCODE){
1129
            nut->next_startcode= startcode;
1130
            break;
1131
        }else if(startcode != INFO_STARTCODE){
1132
            continue;
1133
        }
1134

    
1135
        decode_info_header(nut);
1136
    }
1137

    
1138
    return 0;
1139
}
1140

    
1141
static int decode_frame_header(NUTContext *nut, int *key_frame_ret, int64_t *pts_ret, int *stream_id_ret, int frame_code, int frame_type, int64_t frame_start){
1142
    AVFormatContext *s= nut->avf;
1143
    StreamContext *stream;
1144
    ByteIOContext *bc = &s->pb;
1145
    int size, flags, size_mul, size_lsb, stream_id, time_delta;
1146
    int64_t pts = 0;
1147

    
1148
    if(frame_type < 2 && frame_start - nut->packet_start[2] > nut->max_distance){
1149
        av_log(s, AV_LOG_ERROR, "last frame must have been damaged\n");
1150
        return -1;
1151
    }
1152

    
1153
    if(frame_type)
1154
        nut->packet_start[ frame_type ]= frame_start; //otherwise 1 goto 1 may happen
1155

    
1156
    flags= nut->frame_code[frame_code].flags;
1157
    size_mul= nut->frame_code[frame_code].size_mul;
1158
    size_lsb= nut->frame_code[frame_code].size_lsb;
1159
    stream_id= nut->frame_code[frame_code].stream_id_plus1 - 1;
1160
    time_delta= nut->frame_code[frame_code].timestamp_delta;
1161

    
1162
    if(stream_id==-1)
1163
        stream_id= get_v(bc);
1164
    if(stream_id >= s->nb_streams){
1165
        av_log(s, AV_LOG_ERROR, "illegal stream_id\n");
1166
        return -1;
1167
    }
1168
    stream= &nut->stream[stream_id];
1169

    
1170
//    av_log(s, AV_LOG_DEBUG, "ft:%d ppts:%d %d %d\n", frame_type, stream->lru_pts_delta[0], stream->lru_pts_delta[1], stream->lru_pts_delta[2]);
1171

    
1172
    *key_frame_ret= !!(flags & FLAG_KEY_FRAME);
1173

    
1174
    if(!time_delta){
1175
        int64_t mask = (1<<stream->msb_timestamp_shift)-1;
1176
        pts= get_v(bc);
1177
        if(pts > mask){
1178
            pts -= mask+1;
1179
        }else{
1180
            if(stream->last_pts == AV_NOPTS_VALUE){
1181
                av_log(s, AV_LOG_ERROR, "no reference pts available\n");
1182
                return -1;
1183
            }
1184
            pts= lsb2full(stream, pts);
1185
        }
1186
    }else{
1187
        if(stream->last_pts == AV_NOPTS_VALUE){
1188
            av_log(s, AV_LOG_ERROR, "no reference pts available\n");
1189
            return -1;
1190
        }
1191
        pts= stream->last_pts + time_delta;
1192
    }
1193

    
1194
    if(*key_frame_ret){
1195
//        av_log(s, AV_LOG_DEBUG, "stream:%d start:%lld pts:%lld length:%lld\n",stream_id, frame_start, av_pts, frame_start - nut->stream[stream_id].last_sync_pos);
1196
        av_add_index_entry(
1197
            s->streams[stream_id],
1198
            frame_start,
1199
            pts,
1200
            0,
1201
            frame_start - nut->stream[stream_id].last_sync_pos,
1202
            AVINDEX_KEYFRAME);
1203
        nut->stream[stream_id].last_sync_pos= frame_start;
1204
//                assert(nut->packet_start == frame_start);
1205
    }
1206

    
1207
    assert(size_mul > size_lsb);
1208
    size= size_lsb;
1209
    if(flags & FLAG_DATA_SIZE)
1210
        size+= size_mul*get_v(bc);
1211

    
1212
#ifdef TRACE
1213
av_log(s, AV_LOG_DEBUG, "fs:%lld fc:%d ft:%d kf:%d pts:%lld size:%d mul:%d lsb:%d flags:%d delta:%d\n", frame_start, frame_code, frame_type, *key_frame_ret, pts, size, size_mul, size_lsb, flags, time_delta);
1214
#endif
1215

    
1216
    if(frame_type==0 && url_ftell(bc) - nut->packet_start[2] + size > nut->max_distance){
1217
        av_log(s, AV_LOG_ERROR, "frame size too large\n");
1218
        return -1;
1219
    }
1220

    
1221
    *stream_id_ret = stream_id;
1222
    *pts_ret = pts;
1223

    
1224
    update(nut, stream_id, frame_start, frame_type, frame_code, *key_frame_ret, size, pts);
1225

    
1226
    return size;
1227
}
1228

    
1229
static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code, int frame_type, int64_t frame_start){
1230
    AVFormatContext *s= nut->avf;
1231
    ByteIOContext *bc = &s->pb;
1232
    int size, stream_id, key_frame, discard;
1233
    int64_t pts, last_IP_pts;
1234

    
1235
    size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type, frame_start);
1236
    if(size < 0)
1237
        return -1;
1238

    
1239
    discard= s->streams[ stream_id ]->discard;
1240
    last_IP_pts= s->streams[ stream_id ]->last_IP_pts;
1241
    if(  (discard >= AVDISCARD_NONKEY && !key_frame)
1242
       ||(discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE && last_IP_pts > pts)
1243
       || discard >= AVDISCARD_ALL){
1244
        url_fskip(bc, size);
1245
        return 1;
1246
    }
1247

    
1248
    av_get_packet(bc, pkt, size);
1249
    pkt->stream_index = stream_id;
1250
    if (key_frame)
1251
        pkt->flags |= PKT_FLAG_KEY;
1252
    pkt->pts = pts;
1253

    
1254
    return 0;
1255
}
1256

    
1257
static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
1258
{
1259
    NUTContext *nut = s->priv_data;
1260
    ByteIOContext *bc = &s->pb;
1261
    int i, frame_code=0, ret;
1262

    
1263
    for(;;){
1264
        int64_t pos= url_ftell(bc);
1265
        int frame_type= 0;
1266
        uint64_t tmp= nut->next_startcode;
1267
        nut->next_startcode=0;
1268

    
1269
        if (url_feof(bc))
1270
            return -1;
1271

    
1272
        if(tmp){
1273
            pos-=8;
1274
        }else{
1275
            frame_code = get_byte(bc);
1276
            if(frame_code == 'N'){
1277
                tmp= frame_code;
1278
                for(i=1; i<8; i++)
1279
                    tmp = (tmp<<8) + get_byte(bc);
1280
            }
1281
        }
1282
        switch(tmp){
1283
        case MAIN_STARTCODE:
1284
        case STREAM_STARTCODE:
1285
        case INDEX_STARTCODE:
1286
            get_packetheader(nut, bc, 0);
1287
            assert(nut->packet_start[2] == pos);
1288
            url_fseek(bc, nut->written_packet_size, SEEK_CUR);
1289
            break;
1290
        case INFO_STARTCODE:
1291
            if(decode_info_header(nut)<0)
1292
                goto resync;
1293
            break;
1294
        case KEYFRAME_STARTCODE:
1295
            frame_type = 2;
1296
            reset(s, get_v(bc));
1297
            frame_code = get_byte(bc);
1298
        case 0:
1299
            ret= decode_frame(nut, pkt, frame_code, frame_type, pos);
1300
            if(ret==0)
1301
                return 0;
1302
            else if(ret==1) //ok but discard packet
1303
                break;
1304
        default:
1305
resync:
1306
av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", nut->packet_start[2]+1);
1307
            tmp= find_any_startcode(bc, nut->packet_start[2]+1);
1308
            if(tmp==0)
1309
                return -1;
1310
av_log(s, AV_LOG_DEBUG, "sync\n");
1311
            nut->next_startcode= tmp;
1312
        }
1313
    }
1314
}
1315

    
1316
static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos_arg, int64_t pos_limit){
1317
    NUTContext *nut = s->priv_data;
1318
    StreamContext *stream;
1319
    ByteIOContext *bc = &s->pb;
1320
    int64_t pos, pts;
1321
    uint64_t code;
1322
    int frame_code,step, stream_id, i,size, key_frame;
1323
av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n", stream_index, *pos_arg, pos_limit);
1324

    
1325
    if(*pos_arg < 0)
1326
        return AV_NOPTS_VALUE;
1327

    
1328
    pos= *pos_arg;
1329
    step= FFMIN(16*1024, pos);
1330
    do{
1331
        pos-= step;
1332
        code= find_any_startcode(bc, pos);
1333

    
1334
        if(code && url_ftell(bc) - 8 <= *pos_arg)
1335
            break;
1336
        step= FFMIN(2*step, pos);
1337
    }while(step);
1338

    
1339
    if(!code) //nothing found, not even after pos_arg
1340
        return AV_NOPTS_VALUE;
1341

    
1342
    url_fseek(bc, -8, SEEK_CUR);
1343
    for(i=0; i<s->nb_streams; i++)
1344
        nut->stream[i].last_sync_pos= url_ftell(bc);
1345

    
1346
    for(;;){
1347
        int frame_type=0;
1348
        int64_t pos= url_ftell(bc);
1349
        uint64_t tmp=0;
1350

    
1351
        if(pos > pos_limit || url_feof(bc))
1352
            return AV_NOPTS_VALUE;
1353

    
1354
        frame_code = get_byte(bc);
1355
        if(frame_code == 'N'){
1356
            tmp= frame_code;
1357
            for(i=1; i<8; i++)
1358
                tmp = (tmp<<8) + get_byte(bc);
1359
        }
1360
//av_log(s, AV_LOG_DEBUG, "before switch %llX at=%lld\n", tmp, pos);
1361

    
1362
        switch(tmp){
1363
        case MAIN_STARTCODE:
1364
        case STREAM_STARTCODE:
1365
        case INDEX_STARTCODE:
1366
        case INFO_STARTCODE:
1367
            get_packetheader(nut, bc, 0);
1368
            assert(nut->packet_start[2]==pos);
1369
            url_fseek(bc, nut->written_packet_size, SEEK_CUR);
1370
            break;
1371
        case KEYFRAME_STARTCODE:
1372
            frame_type=2;
1373
            reset(s, get_v(bc));
1374
            frame_code = get_byte(bc);
1375
        case 0:
1376
            size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type, pos);
1377
            if(size < 0)
1378
                goto resync;
1379

    
1380
            stream= &nut->stream[stream_id];
1381
            if(stream_id != stream_index || !key_frame || pos < *pos_arg){
1382
                url_fseek(bc, size, SEEK_CUR);
1383
                break;
1384
            }
1385

    
1386
            *pos_arg= pos;
1387
            return pts;
1388
        default:
1389
resync:
1390
av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", nut->packet_start[2]+1);
1391
            if(!find_any_startcode(bc, nut->packet_start[2]+1))
1392
                return AV_NOPTS_VALUE;
1393

    
1394
            url_fseek(bc, -8, SEEK_CUR);
1395
        }
1396
    }
1397
    return AV_NOPTS_VALUE;
1398
}
1399

    
1400
static int nut_read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1401
//    NUTContext *nut = s->priv_data;
1402
    int64_t pos;
1403

    
1404
    if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1405
        return -1;
1406

    
1407
    pos= url_ftell(&s->pb);
1408
    nut_read_timestamp(s, stream_index, &pos, pos-1);
1409

    
1410
    return 0;
1411
}
1412

    
1413
static int nut_read_close(AVFormatContext *s)
1414
{
1415
    NUTContext *nut = s->priv_data;
1416
    int i;
1417

    
1418
    av_freep(&nut->stream);
1419

    
1420
    return 0;
1421
}
1422

    
1423
static AVInputFormat nut_iformat = {
1424
    "nut",
1425
    "nut format",
1426
    sizeof(NUTContext),
1427
    nut_probe,
1428
    nut_read_header,
1429
    nut_read_packet,
1430
    nut_read_close,
1431
    nut_read_seek,
1432
    nut_read_timestamp,
1433
    .extensions = "nut",
1434
};
1435

    
1436
#ifdef CONFIG_MUXERS
1437
static AVOutputFormat nut_oformat = {
1438
    "nut",
1439
    "nut format",
1440
    "video/x-nut",
1441
    "nut",
1442
    sizeof(NUTContext),
1443
#ifdef CONFIG_LIBVORBIS
1444
    CODEC_ID_VORBIS,
1445
#elif defined(CONFIG_MP3LAME)
1446
    CODEC_ID_MP3,
1447
#else
1448
    CODEC_ID_MP2, /* AC3 needs liba52 decoder */
1449
#endif
1450
    CODEC_ID_MPEG4,
1451
    nut_write_header,
1452
    nut_write_packet,
1453
    nut_write_trailer,
1454
    .flags = AVFMT_GLOBALHEADER,
1455
};
1456
#endif //CONFIG_MUXERS
1457

    
1458
int nut_init(void)
1459
{
1460
    av_register_input_format(&nut_iformat);
1461
#ifdef CONFIG_MUXERS
1462
    av_register_output_format(&nut_oformat);
1463
#endif //CONFIG_MUXERS
1464
    return 0;
1465
}