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ffmpeg / libavformat / nutenc.c @ 2e01def0

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1
/*
2
 * nut muxer
3
 * Copyright (c) 2004-2007 Michael Niedermayer
4
 *
5
 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
21

    
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#include "libavutil/intreadwrite.h"
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#include "libavutil/tree.h"
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#include "libavcodec/mpegaudiodata.h"
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#include "nut.h"
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#include "internal.h"
27

    
28
static int find_expected_header(AVCodecContext *c, int size, int key_frame, uint8_t out[64]){
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    int sample_rate= c->sample_rate;
30

    
31
    if(size>4096)
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        return 0;
33

    
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    AV_WB24(out, 1);
35

    
36
    if(c->codec_id == CODEC_ID_MPEG4){
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        if(key_frame){
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            return 3;
39
        }else{
40
            out[3]= 0xB6;
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            return 4;
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        }
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    }else if(c->codec_id == CODEC_ID_MPEG1VIDEO || c->codec_id == CODEC_ID_MPEG2VIDEO){
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        return 3;
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    }else if(c->codec_id == CODEC_ID_H264){
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        return 3;
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    }else if(c->codec_id == CODEC_ID_MP3 || c->codec_id == CODEC_ID_MP2){
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        int lsf, mpeg25, sample_rate_index, bitrate_index, frame_size;
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        int layer= c->codec_id == CODEC_ID_MP3 ? 3 : 2;
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        unsigned int header= 0xFFF00000;
51

    
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        lsf     = sample_rate < (24000+32000)/2;
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        mpeg25  = sample_rate < (12000+16000)/2;
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        sample_rate <<= lsf + mpeg25;
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        if     (sample_rate < (32000 + 44100)/2) sample_rate_index=2;
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        else if(sample_rate < (44100 + 48000)/2) sample_rate_index=0;
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        else                                     sample_rate_index=1;
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        sample_rate= ff_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25);
60

    
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        for(bitrate_index=2; bitrate_index<30; bitrate_index++){
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            frame_size = ff_mpa_bitrate_tab[lsf][layer-1][bitrate_index>>1];
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            frame_size = (frame_size * 144000) / (sample_rate << lsf) + (bitrate_index&1);
64

    
65
            if(frame_size == size)
66
                break;
67
        }
68

    
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        header |= (!lsf)<<19;
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        header |= (4-layer)<<17;
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        header |= 1<<16; //no crc
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        AV_WB32(out, header);
73
        if(size <= 0)
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            return 2; //we guess there is no crc, if there is one the user clearly does not care about overhead
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        if(bitrate_index == 30)
76
            return -1; //something is wrong ...
77

    
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        header |= (bitrate_index>>1)<<12;
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        header |= sample_rate_index<<10;
80
        header |= (bitrate_index&1)<<9;
81

    
82
        return 2; //FIXME actually put the needed ones in build_elision_headers()
83
        return 3; //we guess that the private bit is not set
84
//FIXME the above assumptions should be checked, if these turn out false too often something should be done
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    }
86
    return 0;
87
}
88

    
89
static int find_header_idx(AVFormatContext *s, AVCodecContext *c, int size, int frame_type){
90
    NUTContext *nut = s->priv_data;
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    uint8_t out[64];
92
    int i;
93
    int len= find_expected_header(c, size, frame_type, out);
94

    
95
//av_log(NULL, AV_LOG_ERROR, "expected_h len=%d size=%d codec_id=%d\n", len, size, c->codec_id);
96

    
97
    for(i=1; i<nut->header_count; i++){
98
        if(   len == nut->header_len[i]
99
           && !memcmp(out, nut->header[i], len)){
100
//    av_log(NULL, AV_LOG_ERROR, "found %d\n", i);
101
            return i;
102
        }
103
    }
104
//    av_log(NULL, AV_LOG_ERROR, "nothing found\n");
105
    return 0;
106
}
107

    
108
static void build_elision_headers(AVFormatContext *s){
109
    NUTContext *nut = s->priv_data;
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    int i;
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    //FIXME this is lame
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    //FIXME write a 2pass mode to find the maximal headers
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    static const uint8_t headers[][5]={
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        {3, 0x00, 0x00, 0x01},
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        {4, 0x00, 0x00, 0x01, 0xB6},
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        {2, 0xFF, 0xFA}, //mp3+crc
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        {2, 0xFF, 0xFB}, //mp3
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        {2, 0xFF, 0xFC}, //mp2+crc
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        {2, 0xFF, 0xFD}, //mp2
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    };
121

    
122
    nut->header_count= 7;
123
    for(i=1; i<nut->header_count; i++){
124
        nut->header_len[i]=  headers[i-1][0];
125
        nut->header    [i]= &headers[i-1][1];
126
    }
127
}
128

    
129
static void build_frame_code(AVFormatContext *s){
130
    NUTContext *nut = s->priv_data;
131
    int key_frame, index, pred, stream_id;
132
    int start=1;
133
    int end= 254;
134
    int keyframe_0_esc= s->nb_streams > 2;
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    int pred_table[10];
136
    FrameCode *ft;
137

    
138
    ft= &nut->frame_code[start];
139
    ft->flags= FLAG_CODED;
140
    ft->size_mul=1;
141
    ft->pts_delta=1;
142
    start++;
143

    
144
    if(keyframe_0_esc){
145
        /* keyframe = 0 escape */
146
        FrameCode *ft= &nut->frame_code[start];
147
        ft->flags= FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS;
148
        ft->size_mul=1;
149
        start++;
150
    }
151

    
152
    for(stream_id= 0; stream_id<s->nb_streams; stream_id++){
153
        int start2= start + (end-start)*stream_id / s->nb_streams;
154
        int end2  = start + (end-start)*(stream_id+1) / s->nb_streams;
155
        AVCodecContext *codec = s->streams[stream_id]->codec;
156
        int is_audio= codec->codec_type == AVMEDIA_TYPE_AUDIO;
157
        int intra_only= /*codec->intra_only || */is_audio;
158
        int pred_count;
159

    
160
        for(key_frame=0; key_frame<2; key_frame++){
161
            if(intra_only && keyframe_0_esc && key_frame==0)
162
                continue;
163

    
164
            {
165
                FrameCode *ft= &nut->frame_code[start2];
166
                ft->flags= FLAG_KEY*key_frame;
167
                ft->flags|= FLAG_SIZE_MSB | FLAG_CODED_PTS;
168
                ft->stream_id= stream_id;
169
                ft->size_mul=1;
170
                if(is_audio)
171
                    ft->header_idx= find_header_idx(s, codec, -1, key_frame);
172
                start2++;
173
            }
174
        }
175

    
176
        key_frame= intra_only;
177
#if 1
178
        if(is_audio){
179
            int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);
180
            int pts;
181
            for(pts=0; pts<2; pts++){
182
                for(pred=0; pred<2; pred++){
183
                    FrameCode *ft= &nut->frame_code[start2];
184
                    ft->flags= FLAG_KEY*key_frame;
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                    ft->stream_id= stream_id;
186
                    ft->size_mul=frame_bytes + 2;
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                    ft->size_lsb=frame_bytes + pred;
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                    ft->pts_delta=pts;
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                    ft->header_idx= find_header_idx(s, codec, frame_bytes + pred, key_frame);
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                    start2++;
191
                }
192
            }
193
        }else{
194
            FrameCode *ft= &nut->frame_code[start2];
195
            ft->flags= FLAG_KEY | FLAG_SIZE_MSB;
196
            ft->stream_id= stream_id;
197
            ft->size_mul=1;
198
            ft->pts_delta=1;
199
            start2++;
200
        }
201
#endif
202

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

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

    
224
            for(index=start3; index<end3; index++){
225
                FrameCode *ft= &nut->frame_code[index];
226
                ft->flags= FLAG_KEY*key_frame;
227
                ft->flags|= FLAG_SIZE_MSB;
228
                ft->stream_id= stream_id;
229
//FIXME use single byte size and pred from last
230
                ft->size_mul= end3-start3;
231
                ft->size_lsb= index - start3;
232
                ft->pts_delta= pred_table[pred];
233
                if(is_audio)
234
                    ft->header_idx= find_header_idx(s, codec, -1, key_frame);
235
            }
236
        }
237
    }
238
    memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N'));
239
    nut->frame_code[  0].flags=
240
    nut->frame_code[255].flags=
241
    nut->frame_code['N'].flags= FLAG_INVALID;
242
}
243

    
244
/**
245
 * Gets the length in bytes which is needed to store val as v.
246
 */
247
static int get_length(uint64_t val){
248
    int i=1;
249

    
250
    while(val>>=7)
251
        i++;
252

    
253
    return i;
254
}
255

    
256
static void put_v(ByteIOContext *bc, uint64_t val){
257
    int i= get_length(val);
258

    
259
    while(--i>0)
260
        put_byte(bc, 128 | (val>>(7*i)));
261

    
262
    put_byte(bc, val&127);
263
}
264

    
265
static void put_tt(NUTContext *nut, StreamContext *nus, ByteIOContext *bc, uint64_t val){
266
    val *= nut->time_base_count;
267
    val += nus->time_base - nut->time_base;
268
    put_v(bc, val);
269
}
270

    
271
/**
272
 * Stores a string as vb.
273
 */
274
static void put_str(ByteIOContext *bc, const char *string){
275
    int len= strlen(string);
276

    
277
    put_v(bc, len);
278
    put_buffer(bc, string, len);
279
}
280

    
281
static void put_s(ByteIOContext *bc, int64_t val){
282
    put_v(bc, 2*FFABS(val) - (val>0));
283
}
284

    
285
#ifdef TRACE
286
static inline void put_v_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
287
    av_log(NULL, AV_LOG_DEBUG, "put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
288

    
289
    put_v(bc, v);
290
}
291

    
292
static inline void put_s_trace(ByteIOContext *bc, int64_t v, char *file, char *func, int line){
293
    av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
294

    
295
    put_s(bc, v);
296
}
297
#define put_v(bc, v)  put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
298
#define put_s(bc, v)  put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
299
#endif
300

    
301
//FIXME remove calculate_checksum
302
static void put_packet(NUTContext *nut, ByteIOContext *bc, ByteIOContext *dyn_bc, int calculate_checksum, uint64_t startcode){
303
    uint8_t *dyn_buf=NULL;
304
    int dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf);
305
    int forw_ptr= dyn_size + 4*calculate_checksum;
306

    
307
    if(forw_ptr > 4096)
308
        init_checksum(bc, ff_crc04C11DB7_update, 0);
309
    put_be64(bc, startcode);
310
    put_v(bc, forw_ptr);
311
    if(forw_ptr > 4096)
312
        put_le32(bc, get_checksum(bc));
313

    
314
    if(calculate_checksum)
315
        init_checksum(bc, ff_crc04C11DB7_update, 0);
316
    put_buffer(bc, dyn_buf, dyn_size);
317
    if(calculate_checksum)
318
        put_le32(bc, get_checksum(bc));
319

    
320
    av_free(dyn_buf);
321
}
322

    
323
static void write_mainheader(NUTContext *nut, ByteIOContext *bc){
324
    int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields, tmp_head_idx;
325
    int64_t tmp_match;
326

    
327
    put_v(bc, 3); /* version */
328
    put_v(bc, nut->avf->nb_streams);
329
    put_v(bc, nut->max_distance);
330
    put_v(bc, nut->time_base_count);
331

    
332
    for(i=0; i<nut->time_base_count; i++){
333
        put_v(bc, nut->time_base[i].num);
334
        put_v(bc, nut->time_base[i].den);
335
    }
336

    
337
    tmp_pts=0;
338
    tmp_mul=1;
339
    tmp_stream=0;
340
    tmp_match= 1-(1LL<<62);
341
    tmp_head_idx= 0;
342
    for(i=0; i<256;){
343
        tmp_fields=0;
344
        tmp_size=0;
345
//        tmp_res=0;
346
        if(tmp_pts    != nut->frame_code[i].pts_delta) tmp_fields=1;
347
        if(tmp_mul    != nut->frame_code[i].size_mul ) tmp_fields=2;
348
        if(tmp_stream != nut->frame_code[i].stream_id) tmp_fields=3;
349
        if(tmp_size   != nut->frame_code[i].size_lsb ) tmp_fields=4;
350
//        if(tmp_res    != nut->frame_code[i].res            ) tmp_fields=5;
351
        if(tmp_head_idx!=nut->frame_code[i].header_idx)tmp_fields=8;
352

    
353
        tmp_pts   = nut->frame_code[i].pts_delta;
354
        tmp_flags = nut->frame_code[i].flags;
355
        tmp_stream= nut->frame_code[i].stream_id;
356
        tmp_mul   = nut->frame_code[i].size_mul;
357
        tmp_size  = nut->frame_code[i].size_lsb;
358
//        tmp_res   = nut->frame_code[i].res;
359
        tmp_head_idx= nut->frame_code[i].header_idx;
360

    
361
        for(j=0; i<256; j++,i++){
362
            if(i == 'N'){
363
                j--;
364
                continue;
365
            }
366
            if(nut->frame_code[i].pts_delta != tmp_pts   ) break;
367
            if(nut->frame_code[i].flags     != tmp_flags ) break;
368
            if(nut->frame_code[i].stream_id != tmp_stream) break;
369
            if(nut->frame_code[i].size_mul  != tmp_mul   ) break;
370
            if(nut->frame_code[i].size_lsb  != tmp_size+j) break;
371
//            if(nut->frame_code[i].res       != tmp_res   ) break;
372
            if(nut->frame_code[i].header_idx!= tmp_head_idx) break;
373
        }
374
        if(j != tmp_mul - tmp_size) tmp_fields=6;
375

    
376
        put_v(bc, tmp_flags);
377
        put_v(bc, tmp_fields);
378
        if(tmp_fields>0) put_s(bc, tmp_pts);
379
        if(tmp_fields>1) put_v(bc, tmp_mul);
380
        if(tmp_fields>2) put_v(bc, tmp_stream);
381
        if(tmp_fields>3) put_v(bc, tmp_size);
382
        if(tmp_fields>4) put_v(bc, 0 /*tmp_res*/);
383
        if(tmp_fields>5) put_v(bc, j);
384
        if(tmp_fields>6) put_v(bc, tmp_match);
385
        if(tmp_fields>7) put_v(bc, tmp_head_idx);
386
    }
387
    put_v(bc, nut->header_count-1);
388
    for(i=1; i<nut->header_count; i++){
389
        put_v(bc, nut->header_len[i]);
390
        put_buffer(bc, nut->header[i], nut->header_len[i]);
391
    }
392
}
393

    
394
static int write_streamheader(NUTContext *nut, ByteIOContext *bc, AVStream *st, int i){
395
    AVCodecContext *codec = st->codec;
396
    put_v(bc, i);
397
    switch(codec->codec_type){
398
    case AVMEDIA_TYPE_VIDEO: put_v(bc, 0); break;
399
    case AVMEDIA_TYPE_AUDIO: put_v(bc, 1); break;
400
    case AVMEDIA_TYPE_SUBTITLE: put_v(bc, 2); break;
401
    default              : put_v(bc, 3); break;
402
    }
403
    put_v(bc, 4);
404
    if (codec->codec_tag){
405
        put_le32(bc, codec->codec_tag);
406
    }else
407
        return -1;
408

    
409
    put_v(bc, nut->stream[i].time_base - nut->time_base);
410
    put_v(bc, nut->stream[i].msb_pts_shift);
411
    put_v(bc, nut->stream[i].max_pts_distance);
412
    put_v(bc, codec->has_b_frames);
413
    put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
414

    
415
    put_v(bc, codec->extradata_size);
416
    put_buffer(bc, codec->extradata, codec->extradata_size);
417

    
418
    switch(codec->codec_type){
419
    case AVMEDIA_TYPE_AUDIO:
420
        put_v(bc, codec->sample_rate);
421
        put_v(bc, 1);
422
        put_v(bc, codec->channels);
423
        break;
424
    case AVMEDIA_TYPE_VIDEO:
425
        put_v(bc, codec->width);
426
        put_v(bc, codec->height);
427

    
428
        if(st->sample_aspect_ratio.num<=0 || st->sample_aspect_ratio.den<=0){
429
            put_v(bc, 0);
430
            put_v(bc, 0);
431
        }else{
432
            put_v(bc, st->sample_aspect_ratio.num);
433
            put_v(bc, st->sample_aspect_ratio.den);
434
        }
435
        put_v(bc, 0); /* csp type -- unknown */
436
        break;
437
    default:
438
        break;
439
    }
440
    return 0;
441
}
442

    
443
static int add_info(ByteIOContext *bc, const char *type, const char *value){
444
    put_str(bc, type);
445
    put_s(bc, -1);
446
    put_str(bc, value);
447
    return 1;
448
}
449

    
450
static int write_globalinfo(NUTContext *nut, ByteIOContext *bc){
451
    AVFormatContext *s= nut->avf;
452
    AVMetadataTag *t = NULL;
453
    ByteIOContext *dyn_bc;
454
    uint8_t *dyn_buf=NULL;
455
    int count=0, dyn_size;
456
    int ret = url_open_dyn_buf(&dyn_bc);
457
    if(ret < 0)
458
        return ret;
459

    
460
    while ((t = av_metadata_get(s->metadata, "", t, AV_METADATA_IGNORE_SUFFIX)))
461
        count += add_info(dyn_bc, t->key, t->value);
462

    
463
    put_v(bc, 0); //stream_if_plus1
464
    put_v(bc, 0); //chapter_id
465
    put_v(bc, 0); //timestamp_start
466
    put_v(bc, 0); //length
467

    
468
    put_v(bc, count);
469

    
470
    dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf);
471
    put_buffer(bc, dyn_buf, dyn_size);
472
    av_free(dyn_buf);
473
    return 0;
474
}
475

    
476
static int write_streaminfo(NUTContext *nut, ByteIOContext *bc, int stream_id){
477
    AVFormatContext *s= nut->avf;
478
    AVStream* st = s->streams[stream_id];
479
    ByteIOContext *dyn_bc;
480
    uint8_t *dyn_buf=NULL;
481
    int count=0, dyn_size, i;
482
    int ret = url_open_dyn_buf(&dyn_bc);
483
    if(ret < 0)
484
        return ret;
485

    
486
    for (i=0; ff_nut_dispositions[i].flag; ++i) {
487
        if (st->disposition & ff_nut_dispositions[i].flag)
488
            count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str);
489
    }
490
    dyn_size = url_close_dyn_buf(dyn_bc, &dyn_buf);
491

    
492
    if (count) {
493
        put_v(bc, stream_id + 1); //stream_id_plus1
494
        put_v(bc, 0); //chapter_id
495
        put_v(bc, 0); //timestamp_start
496
        put_v(bc, 0); //length
497

    
498
        put_v(bc, count);
499

    
500
        put_buffer(bc, dyn_buf, dyn_size);
501
    }
502

    
503
    av_free(dyn_buf);
504
    return count;
505
}
506

    
507
static int write_headers(NUTContext *nut, ByteIOContext *bc){
508
    ByteIOContext *dyn_bc;
509
    int i, ret;
510

    
511
    ret = url_open_dyn_buf(&dyn_bc);
512
    if(ret < 0)
513
        return ret;
514
    write_mainheader(nut, dyn_bc);
515
    put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE);
516

    
517
    for (i=0; i < nut->avf->nb_streams; i++){
518
        ret = url_open_dyn_buf(&dyn_bc);
519
        if(ret < 0)
520
            return ret;
521
        write_streamheader(nut, dyn_bc, nut->avf->streams[i], i);
522
        put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE);
523
    }
524

    
525
    ret = url_open_dyn_buf(&dyn_bc);
526
    if(ret < 0)
527
        return ret;
528
    write_globalinfo(nut, dyn_bc);
529
    put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
530

    
531
    for (i = 0; i < nut->avf->nb_streams; i++) {
532
        ret = url_open_dyn_buf(&dyn_bc);
533
        if(ret < 0)
534
            return ret;
535
        ret = write_streaminfo(nut, dyn_bc, i);
536
        if (ret < 0)
537
            return ret;
538
        if (ret > 0)
539
            put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
540
        else {
541
            uint8_t* buf;
542
            url_close_dyn_buf(dyn_bc, &buf);
543
            av_free(buf);
544
        }
545
    }
546

    
547
    nut->last_syncpoint_pos= INT_MIN;
548
    nut->header_count++;
549
    return 0;
550
}
551

    
552
static int write_header(AVFormatContext *s){
553
    NUTContext *nut = s->priv_data;
554
    ByteIOContext *bc = s->pb;
555
    int i, j;
556

    
557
    nut->avf= s;
558

    
559
    nut->stream   = av_mallocz(sizeof(StreamContext)*s->nb_streams);
560
    nut->time_base= av_mallocz(sizeof(AVRational   )*s->nb_streams);
561

    
562
    for(i=0; i<s->nb_streams; i++){
563
        AVStream *st= s->streams[i];
564
        int ssize;
565
        AVRational time_base;
566
        ff_parse_specific_params(st->codec, &time_base.den, &ssize, &time_base.num);
567

    
568
        av_set_pts_info(st, 64, time_base.num, time_base.den);
569

    
570
        for(j=0; j<nut->time_base_count; j++){
571
            if(!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))){
572
                break;
573
            }
574
        }
575
        nut->time_base[j]= time_base;
576
        nut->stream[i].time_base= &nut->time_base[j];
577
        if(j==nut->time_base_count)
578
            nut->time_base_count++;
579

    
580
        if(av_q2d(time_base) >= 0.001)
581
            nut->stream[i].msb_pts_shift = 7;
582
        else
583
            nut->stream[i].msb_pts_shift = 14;
584
        nut->stream[i].max_pts_distance= FFMAX(1/av_q2d(time_base), 1);
585
    }
586

    
587
    nut->max_distance = MAX_DISTANCE;
588
    build_elision_headers(s);
589
    build_frame_code(s);
590
    assert(nut->frame_code['N'].flags == FLAG_INVALID);
591

    
592
    put_buffer(bc, ID_STRING, strlen(ID_STRING));
593
    put_byte(bc, 0);
594

    
595
    write_headers(nut, bc);
596

    
597
    put_flush_packet(bc);
598

    
599
    //FIXME index
600

    
601
    return 0;
602
}
603

    
604
static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc, AVPacket *pkt){
605
    int flags= 0;
606

    
607
    if(pkt->flags & AV_PKT_FLAG_KEY             ) flags |= FLAG_KEY;
608
    if(pkt->stream_index != fc->stream_id       ) flags |= FLAG_STREAM_ID;
609
    if(pkt->size / fc->size_mul                 ) flags |= FLAG_SIZE_MSB;
610
    if(pkt->pts - nus->last_pts != fc->pts_delta) flags |= FLAG_CODED_PTS;
611
    if(pkt->size > 2*nut->max_distance          ) flags |= FLAG_CHECKSUM;
612
    if(FFABS(pkt->pts - nus->last_pts)
613
                         > nus->max_pts_distance) flags |= FLAG_CHECKSUM;
614
    if(   pkt->size < nut->header_len[fc->header_idx]
615
       || (pkt->size > 4096 && fc->header_idx)
616
       || memcmp(pkt->data, nut->header[fc->header_idx], nut->header_len[fc->header_idx]))
617
                                                  flags |= FLAG_HEADER_IDX;
618

    
619
    return flags | (fc->flags & FLAG_CODED);
620
}
621

    
622
static int find_best_header_idx(NUTContext *nut, AVPacket *pkt){
623
    int i;
624
    int best_i  = 0;
625
    int best_len= 0;
626

    
627
    if(pkt->size > 4096)
628
        return 0;
629

    
630
    for(i=1; i<nut->header_count; i++){
631
        if(   pkt->size >= nut->header_len[i]
632
           &&  nut->header_len[i] > best_len
633
           && !memcmp(pkt->data, nut->header[i], nut->header_len[i])){
634
            best_i= i;
635
            best_len= nut->header_len[i];
636
        }
637
    }
638
    return best_i;
639
}
640

    
641
static int write_packet(AVFormatContext *s, AVPacket *pkt){
642
    NUTContext *nut = s->priv_data;
643
    StreamContext *nus= &nut->stream[pkt->stream_index];
644
    ByteIOContext *bc = s->pb, *dyn_bc;
645
    FrameCode *fc;
646
    int64_t coded_pts;
647
    int best_length, frame_code, flags, needed_flags, i, header_idx, best_header_idx;
648
    int key_frame = !!(pkt->flags & AV_PKT_FLAG_KEY);
649
    int store_sp=0;
650
    int ret;
651

    
652
    if(pkt->pts < 0)
653
        return -1;
654

    
655
    if(1LL<<(20+3*nut->header_count) <= url_ftell(bc))
656
        write_headers(nut, bc);
657

    
658
    if(key_frame && !(nus->last_flags & FLAG_KEY))
659
        store_sp= 1;
660

    
661
    if(pkt->size + 30/*FIXME check*/ + url_ftell(bc) >= nut->last_syncpoint_pos + nut->max_distance)
662
        store_sp= 1;
663

    
664
//FIXME: Ensure store_sp is 1 in the first place.
665

    
666
    if(store_sp){
667
        Syncpoint *sp, dummy= {.pos= INT64_MAX};
668

    
669
        ff_nut_reset_ts(nut, *nus->time_base, pkt->dts);
670
        for(i=0; i<s->nb_streams; i++){
671
            AVStream *st= s->streams[i];
672
            int64_t dts_tb = av_rescale_rnd(pkt->dts,
673
                nus->time_base->num * (int64_t)nut->stream[i].time_base->den,
674
                nus->time_base->den * (int64_t)nut->stream[i].time_base->num,
675
                AV_ROUND_DOWN);
676
            int index= av_index_search_timestamp(st, dts_tb, AVSEEK_FLAG_BACKWARD);
677
            if(index>=0) dummy.pos= FFMIN(dummy.pos, st->index_entries[index].pos);
678
        }
679
        if(dummy.pos == INT64_MAX)
680
            dummy.pos= 0;
681
        sp= av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
682
                         NULL);
683

    
684
        nut->last_syncpoint_pos= url_ftell(bc);
685
        ret = url_open_dyn_buf(&dyn_bc);
686
        if(ret < 0)
687
            return ret;
688
        put_tt(nut, nus, dyn_bc, pkt->dts);
689
        put_v(dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos)>>4 : 0);
690
        put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE);
691

    
692
        ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0/*unused*/, pkt->dts);
693
    }
694
    assert(nus->last_pts != AV_NOPTS_VALUE);
695

    
696
    coded_pts = pkt->pts & ((1<<nus->msb_pts_shift)-1);
697
    if(ff_lsb2full(nus, coded_pts) != pkt->pts)
698
        coded_pts= pkt->pts + (1<<nus->msb_pts_shift);
699

    
700
    best_header_idx= find_best_header_idx(nut, pkt);
701

    
702
    best_length=INT_MAX;
703
    frame_code= -1;
704
    for(i=0; i<256; i++){
705
        int length= 0;
706
        FrameCode *fc= &nut->frame_code[i];
707
        int flags= fc->flags;
708

    
709
        if(flags & FLAG_INVALID)
710
            continue;
711
        needed_flags= get_needed_flags(nut, nus, fc, pkt);
712

    
713
        if(flags & FLAG_CODED){
714
            length++;
715
            flags = needed_flags;
716
        }
717

    
718
        if((flags & needed_flags) != needed_flags)
719
            continue;
720

    
721
        if((flags ^ needed_flags) & FLAG_KEY)
722
            continue;
723

    
724
        if(flags & FLAG_STREAM_ID)
725
            length+= get_length(pkt->stream_index);
726

    
727
        if(pkt->size % fc->size_mul != fc->size_lsb)
728
            continue;
729
        if(flags & FLAG_SIZE_MSB)
730
            length += get_length(pkt->size / fc->size_mul);
731

    
732
        if(flags & FLAG_CHECKSUM)
733
            length+=4;
734

    
735
        if(flags & FLAG_CODED_PTS)
736
            length += get_length(coded_pts);
737

    
738
        if(   (flags & FLAG_CODED)
739
           && nut->header_len[best_header_idx] > nut->header_len[fc->header_idx]+1){
740
            flags |= FLAG_HEADER_IDX;
741
        }
742

    
743
        if(flags & FLAG_HEADER_IDX){
744
            length += 1 - nut->header_len[best_header_idx];
745
        }else{
746
            length -= nut->header_len[fc->header_idx];
747
        }
748

    
749
        length*=4;
750
        length+= !(flags & FLAG_CODED_PTS);
751
        length+= !(flags & FLAG_CHECKSUM);
752

    
753
        if(length < best_length){
754
            best_length= length;
755
            frame_code=i;
756
        }
757
    }
758
    assert(frame_code != -1);
759
    fc= &nut->frame_code[frame_code];
760
    flags= fc->flags;
761
    needed_flags= get_needed_flags(nut, nus, fc, pkt);
762
    header_idx= fc->header_idx;
763

    
764
    init_checksum(bc, ff_crc04C11DB7_update, 0);
765
    put_byte(bc, frame_code);
766
    if(flags & FLAG_CODED){
767
        put_v(bc, (flags^needed_flags) & ~(FLAG_CODED));
768
        flags = needed_flags;
769
    }
770
    if(flags & FLAG_STREAM_ID)  put_v(bc, pkt->stream_index);
771
    if(flags & FLAG_CODED_PTS)  put_v(bc, coded_pts);
772
    if(flags & FLAG_SIZE_MSB)   put_v(bc, pkt->size / fc->size_mul);
773
    if(flags & FLAG_HEADER_IDX) put_v(bc, header_idx= best_header_idx);
774

    
775
    if(flags & FLAG_CHECKSUM)   put_le32(bc, get_checksum(bc));
776
    else                        get_checksum(bc);
777

    
778
    put_buffer(bc, pkt->data + nut->header_len[header_idx], pkt->size - nut->header_len[header_idx]);
779
    nus->last_flags= flags;
780
    nus->last_pts= pkt->pts;
781

    
782
    //FIXME just store one per syncpoint
783
    if(flags & FLAG_KEY)
784
        av_add_index_entry(
785
            s->streams[pkt->stream_index],
786
            nut->last_syncpoint_pos,
787
            pkt->pts,
788
            0,
789
            0,
790
            AVINDEX_KEYFRAME);
791

    
792
    return 0;
793
}
794

    
795
static int write_trailer(AVFormatContext *s){
796
    NUTContext *nut= s->priv_data;
797
    ByteIOContext *bc= s->pb;
798

    
799
    while(nut->header_count<3)
800
        write_headers(nut, bc);
801
    put_flush_packet(bc);
802
    ff_nut_free_sp(nut);
803
    av_freep(&nut->stream);
804
    av_freep(&nut->time_base);
805

    
806
    return 0;
807
}
808

    
809
AVOutputFormat nut_muxer = {
810
    "nut",
811
    NULL_IF_CONFIG_SMALL("NUT format"),
812
    "video/x-nut",
813
    "nut",
814
    sizeof(NUTContext),
815
#if   CONFIG_LIBVORBIS
816
    CODEC_ID_VORBIS,
817
#elif CONFIG_LIBMP3LAME
818
    CODEC_ID_MP3,
819
#else
820
    CODEC_ID_MP2,
821
#endif
822
    CODEC_ID_MPEG4,
823
    write_header,
824
    write_packet,
825
    write_trailer,
826
    .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
827
    .codec_tag = (const AVCodecTag * const []){ ff_codec_bmp_tags, ff_nut_video_tags, ff_codec_wav_tags, ff_nut_subtitle_tags, 0 },
828
    .metadata_conv = ff_nut_metadata_conv,
829
};