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ffmpeg / libavformat / nutenc.c @ 603e5c0b

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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
8
 * 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,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * 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

    
34
    AV_WB24(out, 1);
35

    
36
    if(c->codec_id == CODEC_ID_MPEG4){
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        if(key_frame){
38
            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;
45
    }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){
48
        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;
58

    
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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

    
69
        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)
74
            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

    
78
        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
85
    }
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;
91
    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;
110
    int i;
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    //FIXME this is lame
112
    //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
120
    };
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;
135
    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;
185
                    ft->stream_id= stream_id;
186
                    ft->size_mul=frame_bytes + 2;
187
                    ft->size_lsb=frame_bytes + pred;
188
                    ft->pts_delta=pts;
189
                    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
static void put_tt(NUTContext *nut, StreamContext *nus, ByteIOContext *bc, uint64_t val){
245
    val *= nut->time_base_count;
246
    val += nus->time_base - nut->time_base;
247
    ff_put_v(bc, val);
248
}
249

    
250
/**
251
 * Store a string as vb.
252
 */
253
static void put_str(ByteIOContext *bc, const char *string){
254
    int len= strlen(string);
255

    
256
    ff_put_v(bc, len);
257
    put_buffer(bc, string, len);
258
}
259

    
260
static void put_s(ByteIOContext *bc, int64_t val){
261
    ff_put_v(bc, 2*FFABS(val) - (val>0));
262
}
263

    
264
#ifdef TRACE
265
static inline void ff_put_v_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
266
    av_log(NULL, AV_LOG_DEBUG, "ff_put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
267

    
268
    ff_put_v(bc, v);
269
}
270

    
271
static inline void put_s_trace(ByteIOContext *bc, int64_t v, char *file, char *func, int line){
272
    av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
273

    
274
    put_s(bc, v);
275
}
276
#define ff_put_v(bc, v)  ff_put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
277
#define put_s(bc, v)  put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
278
#endif
279

    
280
//FIXME remove calculate_checksum
281
static void put_packet(NUTContext *nut, ByteIOContext *bc, ByteIOContext *dyn_bc, int calculate_checksum, uint64_t startcode){
282
    uint8_t *dyn_buf=NULL;
283
    int dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf);
284
    int forw_ptr= dyn_size + 4*calculate_checksum;
285

    
286
    if(forw_ptr > 4096)
287
        init_checksum(bc, ff_crc04C11DB7_update, 0);
288
    put_be64(bc, startcode);
289
    ff_put_v(bc, forw_ptr);
290
    if(forw_ptr > 4096)
291
        put_le32(bc, get_checksum(bc));
292

    
293
    if(calculate_checksum)
294
        init_checksum(bc, ff_crc04C11DB7_update, 0);
295
    put_buffer(bc, dyn_buf, dyn_size);
296
    if(calculate_checksum)
297
        put_le32(bc, get_checksum(bc));
298

    
299
    av_free(dyn_buf);
300
}
301

    
302
static void write_mainheader(NUTContext *nut, ByteIOContext *bc){
303
    int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields, tmp_head_idx;
304
    int64_t tmp_match;
305

    
306
    ff_put_v(bc, 3); /* version */
307
    ff_put_v(bc, nut->avf->nb_streams);
308
    ff_put_v(bc, nut->max_distance);
309
    ff_put_v(bc, nut->time_base_count);
310

    
311
    for(i=0; i<nut->time_base_count; i++){
312
        ff_put_v(bc, nut->time_base[i].num);
313
        ff_put_v(bc, nut->time_base[i].den);
314
    }
315

    
316
    tmp_pts=0;
317
    tmp_mul=1;
318
    tmp_stream=0;
319
    tmp_match= 1-(1LL<<62);
320
    tmp_head_idx= 0;
321
    for(i=0; i<256;){
322
        tmp_fields=0;
323
        tmp_size=0;
324
//        tmp_res=0;
325
        if(tmp_pts    != nut->frame_code[i].pts_delta) tmp_fields=1;
326
        if(tmp_mul    != nut->frame_code[i].size_mul ) tmp_fields=2;
327
        if(tmp_stream != nut->frame_code[i].stream_id) tmp_fields=3;
328
        if(tmp_size   != nut->frame_code[i].size_lsb ) tmp_fields=4;
329
//        if(tmp_res    != nut->frame_code[i].res            ) tmp_fields=5;
330
        if(tmp_head_idx!=nut->frame_code[i].header_idx)tmp_fields=8;
331

    
332
        tmp_pts   = nut->frame_code[i].pts_delta;
333
        tmp_flags = nut->frame_code[i].flags;
334
        tmp_stream= nut->frame_code[i].stream_id;
335
        tmp_mul   = nut->frame_code[i].size_mul;
336
        tmp_size  = nut->frame_code[i].size_lsb;
337
//        tmp_res   = nut->frame_code[i].res;
338
        tmp_head_idx= nut->frame_code[i].header_idx;
339

    
340
        for(j=0; i<256; j++,i++){
341
            if(i == 'N'){
342
                j--;
343
                continue;
344
            }
345
            if(nut->frame_code[i].pts_delta != tmp_pts   ) break;
346
            if(nut->frame_code[i].flags     != tmp_flags ) break;
347
            if(nut->frame_code[i].stream_id != tmp_stream) break;
348
            if(nut->frame_code[i].size_mul  != tmp_mul   ) break;
349
            if(nut->frame_code[i].size_lsb  != tmp_size+j) break;
350
//            if(nut->frame_code[i].res       != tmp_res   ) break;
351
            if(nut->frame_code[i].header_idx!= tmp_head_idx) break;
352
        }
353
        if(j != tmp_mul - tmp_size) tmp_fields=6;
354

    
355
        ff_put_v(bc, tmp_flags);
356
        ff_put_v(bc, tmp_fields);
357
        if(tmp_fields>0) put_s(bc, tmp_pts);
358
        if(tmp_fields>1) ff_put_v(bc, tmp_mul);
359
        if(tmp_fields>2) ff_put_v(bc, tmp_stream);
360
        if(tmp_fields>3) ff_put_v(bc, tmp_size);
361
        if(tmp_fields>4) ff_put_v(bc, 0 /*tmp_res*/);
362
        if(tmp_fields>5) ff_put_v(bc, j);
363
        if(tmp_fields>6) ff_put_v(bc, tmp_match);
364
        if(tmp_fields>7) ff_put_v(bc, tmp_head_idx);
365
    }
366
    ff_put_v(bc, nut->header_count-1);
367
    for(i=1; i<nut->header_count; i++){
368
        ff_put_v(bc, nut->header_len[i]);
369
        put_buffer(bc, nut->header[i], nut->header_len[i]);
370
    }
371
}
372

    
373
static int write_streamheader(AVFormatContext *avctx, ByteIOContext *bc, AVStream *st, int i){
374
    NUTContext *nut = avctx->priv_data;
375
    AVCodecContext *codec = st->codec;
376
    ff_put_v(bc, i);
377
    switch(codec->codec_type){
378
    case AVMEDIA_TYPE_VIDEO: ff_put_v(bc, 0); break;
379
    case AVMEDIA_TYPE_AUDIO: ff_put_v(bc, 1); break;
380
    case AVMEDIA_TYPE_SUBTITLE: ff_put_v(bc, 2); break;
381
    default              : ff_put_v(bc, 3); break;
382
    }
383
    ff_put_v(bc, 4);
384
    if (codec->codec_tag){
385
        put_le32(bc, codec->codec_tag);
386
    } else {
387
        av_log(avctx, AV_LOG_ERROR, "No codec tag defined for stream %d\n", i);
388
        return AVERROR(EINVAL);
389
    }
390

    
391
    ff_put_v(bc, nut->stream[i].time_base - nut->time_base);
392
    ff_put_v(bc, nut->stream[i].msb_pts_shift);
393
    ff_put_v(bc, nut->stream[i].max_pts_distance);
394
    ff_put_v(bc, codec->has_b_frames);
395
    put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
396

    
397
    ff_put_v(bc, codec->extradata_size);
398
    put_buffer(bc, codec->extradata, codec->extradata_size);
399

    
400
    switch(codec->codec_type){
401
    case AVMEDIA_TYPE_AUDIO:
402
        ff_put_v(bc, codec->sample_rate);
403
        ff_put_v(bc, 1);
404
        ff_put_v(bc, codec->channels);
405
        break;
406
    case AVMEDIA_TYPE_VIDEO:
407
        ff_put_v(bc, codec->width);
408
        ff_put_v(bc, codec->height);
409

    
410
        if(st->sample_aspect_ratio.num<=0 || st->sample_aspect_ratio.den<=0){
411
            ff_put_v(bc, 0);
412
            ff_put_v(bc, 0);
413
        }else{
414
            ff_put_v(bc, st->sample_aspect_ratio.num);
415
            ff_put_v(bc, st->sample_aspect_ratio.den);
416
        }
417
        ff_put_v(bc, 0); /* csp type -- unknown */
418
        break;
419
    default:
420
        break;
421
    }
422
    return 0;
423
}
424

    
425
static int add_info(ByteIOContext *bc, const char *type, const char *value){
426
    put_str(bc, type);
427
    put_s(bc, -1);
428
    put_str(bc, value);
429
    return 1;
430
}
431

    
432
static int write_globalinfo(NUTContext *nut, ByteIOContext *bc){
433
    AVFormatContext *s= nut->avf;
434
    AVMetadataTag *t = NULL;
435
    ByteIOContext *dyn_bc;
436
    uint8_t *dyn_buf=NULL;
437
    int count=0, dyn_size;
438
    int ret = url_open_dyn_buf(&dyn_bc);
439
    if(ret < 0)
440
        return ret;
441

    
442
    while ((t = av_metadata_get(s->metadata, "", t, AV_METADATA_IGNORE_SUFFIX)))
443
        count += add_info(dyn_bc, t->key, t->value);
444

    
445
    ff_put_v(bc, 0); //stream_if_plus1
446
    ff_put_v(bc, 0); //chapter_id
447
    ff_put_v(bc, 0); //timestamp_start
448
    ff_put_v(bc, 0); //length
449

    
450
    ff_put_v(bc, count);
451

    
452
    dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf);
453
    put_buffer(bc, dyn_buf, dyn_size);
454
    av_free(dyn_buf);
455
    return 0;
456
}
457

    
458
static int write_streaminfo(NUTContext *nut, ByteIOContext *bc, int stream_id){
459
    AVFormatContext *s= nut->avf;
460
    AVStream* st = s->streams[stream_id];
461
    ByteIOContext *dyn_bc;
462
    uint8_t *dyn_buf=NULL;
463
    int count=0, dyn_size, i;
464
    int ret = url_open_dyn_buf(&dyn_bc);
465
    if(ret < 0)
466
        return ret;
467

    
468
    for (i=0; ff_nut_dispositions[i].flag; ++i) {
469
        if (st->disposition & ff_nut_dispositions[i].flag)
470
            count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str);
471
    }
472
    dyn_size = url_close_dyn_buf(dyn_bc, &dyn_buf);
473

    
474
    if (count) {
475
        ff_put_v(bc, stream_id + 1); //stream_id_plus1
476
        ff_put_v(bc, 0); //chapter_id
477
        ff_put_v(bc, 0); //timestamp_start
478
        ff_put_v(bc, 0); //length
479

    
480
        ff_put_v(bc, count);
481

    
482
        put_buffer(bc, dyn_buf, dyn_size);
483
    }
484

    
485
    av_free(dyn_buf);
486
    return count;
487
}
488

    
489
static int write_headers(AVFormatContext *avctx, ByteIOContext *bc){
490
    NUTContext *nut = avctx->priv_data;
491
    ByteIOContext *dyn_bc;
492
    int i, ret;
493

    
494
    ret = url_open_dyn_buf(&dyn_bc);
495
    if(ret < 0)
496
        return ret;
497
    write_mainheader(nut, dyn_bc);
498
    put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE);
499

    
500
    for (i=0; i < nut->avf->nb_streams; i++){
501
        ret = url_open_dyn_buf(&dyn_bc);
502
        if(ret < 0)
503
            return ret;
504
        if ((ret = write_streamheader(avctx, dyn_bc, nut->avf->streams[i], i)) < 0)
505
            return ret;
506
        put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE);
507
    }
508

    
509
    ret = url_open_dyn_buf(&dyn_bc);
510
    if(ret < 0)
511
        return ret;
512
    write_globalinfo(nut, dyn_bc);
513
    put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
514

    
515
    for (i = 0; i < nut->avf->nb_streams; i++) {
516
        ret = url_open_dyn_buf(&dyn_bc);
517
        if(ret < 0)
518
            return ret;
519
        ret = write_streaminfo(nut, dyn_bc, i);
520
        if (ret < 0)
521
            return ret;
522
        if (ret > 0)
523
            put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
524
        else {
525
            uint8_t* buf;
526
            url_close_dyn_buf(dyn_bc, &buf);
527
            av_free(buf);
528
        }
529
    }
530

    
531
    nut->last_syncpoint_pos= INT_MIN;
532
    nut->header_count++;
533
    return 0;
534
}
535

    
536
static int write_header(AVFormatContext *s){
537
    NUTContext *nut = s->priv_data;
538
    ByteIOContext *bc = s->pb;
539
    int i, j, ret;
540

    
541
    nut->avf= s;
542

    
543
    nut->stream   = av_mallocz(sizeof(StreamContext)*s->nb_streams);
544
    nut->time_base= av_mallocz(sizeof(AVRational   )*s->nb_streams);
545

    
546
    for(i=0; i<s->nb_streams; i++){
547
        AVStream *st= s->streams[i];
548
        int ssize;
549
        AVRational time_base;
550
        ff_parse_specific_params(st->codec, &time_base.den, &ssize, &time_base.num);
551

    
552
        av_set_pts_info(st, 64, time_base.num, time_base.den);
553

    
554
        for(j=0; j<nut->time_base_count; j++){
555
            if(!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))){
556
                break;
557
            }
558
        }
559
        nut->time_base[j]= time_base;
560
        nut->stream[i].time_base= &nut->time_base[j];
561
        if(j==nut->time_base_count)
562
            nut->time_base_count++;
563

    
564
        if(av_q2d(time_base) >= 0.001)
565
            nut->stream[i].msb_pts_shift = 7;
566
        else
567
            nut->stream[i].msb_pts_shift = 14;
568
        nut->stream[i].max_pts_distance= FFMAX(1/av_q2d(time_base), 1);
569
    }
570

    
571
    nut->max_distance = MAX_DISTANCE;
572
    build_elision_headers(s);
573
    build_frame_code(s);
574
    assert(nut->frame_code['N'].flags == FLAG_INVALID);
575

    
576
    put_buffer(bc, ID_STRING, strlen(ID_STRING));
577
    put_byte(bc, 0);
578

    
579
    if ((ret = write_headers(s, bc)) < 0)
580
        return ret;
581

    
582
    put_flush_packet(bc);
583

    
584
    //FIXME index
585

    
586
    return 0;
587
}
588

    
589
static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc, AVPacket *pkt){
590
    int flags= 0;
591

    
592
    if(pkt->flags & AV_PKT_FLAG_KEY             ) flags |= FLAG_KEY;
593
    if(pkt->stream_index != fc->stream_id       ) flags |= FLAG_STREAM_ID;
594
    if(pkt->size / fc->size_mul                 ) flags |= FLAG_SIZE_MSB;
595
    if(pkt->pts - nus->last_pts != fc->pts_delta) flags |= FLAG_CODED_PTS;
596
    if(pkt->size > 2*nut->max_distance          ) flags |= FLAG_CHECKSUM;
597
    if(FFABS(pkt->pts - nus->last_pts)
598
                         > nus->max_pts_distance) flags |= FLAG_CHECKSUM;
599
    if(   pkt->size < nut->header_len[fc->header_idx]
600
       || (pkt->size > 4096 && fc->header_idx)
601
       || memcmp(pkt->data, nut->header[fc->header_idx], nut->header_len[fc->header_idx]))
602
                                                  flags |= FLAG_HEADER_IDX;
603

    
604
    return flags | (fc->flags & FLAG_CODED);
605
}
606

    
607
static int find_best_header_idx(NUTContext *nut, AVPacket *pkt){
608
    int i;
609
    int best_i  = 0;
610
    int best_len= 0;
611

    
612
    if(pkt->size > 4096)
613
        return 0;
614

    
615
    for(i=1; i<nut->header_count; i++){
616
        if(   pkt->size >= nut->header_len[i]
617
           &&  nut->header_len[i] > best_len
618
           && !memcmp(pkt->data, nut->header[i], nut->header_len[i])){
619
            best_i= i;
620
            best_len= nut->header_len[i];
621
        }
622
    }
623
    return best_i;
624
}
625

    
626
static int write_packet(AVFormatContext *s, AVPacket *pkt){
627
    NUTContext *nut = s->priv_data;
628
    StreamContext *nus= &nut->stream[pkt->stream_index];
629
    ByteIOContext *bc = s->pb, *dyn_bc;
630
    FrameCode *fc;
631
    int64_t coded_pts;
632
    int best_length, frame_code, flags, needed_flags, i, header_idx, best_header_idx;
633
    int key_frame = !!(pkt->flags & AV_PKT_FLAG_KEY);
634
    int store_sp=0;
635
    int ret;
636

    
637
    if(pkt->pts < 0)
638
        return -1;
639

    
640
    if(1LL<<(20+3*nut->header_count) <= url_ftell(bc))
641
        write_headers(s, bc);
642

    
643
    if(key_frame && !(nus->last_flags & FLAG_KEY))
644
        store_sp= 1;
645

    
646
    if(pkt->size + 30/*FIXME check*/ + url_ftell(bc) >= nut->last_syncpoint_pos + nut->max_distance)
647
        store_sp= 1;
648

    
649
//FIXME: Ensure store_sp is 1 in the first place.
650

    
651
    if(store_sp){
652
        Syncpoint *sp, dummy= {.pos= INT64_MAX};
653

    
654
        ff_nut_reset_ts(nut, *nus->time_base, pkt->dts);
655
        for(i=0; i<s->nb_streams; i++){
656
            AVStream *st= s->streams[i];
657
            int64_t dts_tb = av_rescale_rnd(pkt->dts,
658
                nus->time_base->num * (int64_t)nut->stream[i].time_base->den,
659
                nus->time_base->den * (int64_t)nut->stream[i].time_base->num,
660
                AV_ROUND_DOWN);
661
            int index= av_index_search_timestamp(st, dts_tb, AVSEEK_FLAG_BACKWARD);
662
            if(index>=0) dummy.pos= FFMIN(dummy.pos, st->index_entries[index].pos);
663
        }
664
        if(dummy.pos == INT64_MAX)
665
            dummy.pos= 0;
666
        sp= av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
667
                         NULL);
668

    
669
        nut->last_syncpoint_pos= url_ftell(bc);
670
        ret = url_open_dyn_buf(&dyn_bc);
671
        if(ret < 0)
672
            return ret;
673
        put_tt(nut, nus, dyn_bc, pkt->dts);
674
        ff_put_v(dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos)>>4 : 0);
675
        put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE);
676

    
677
        ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0/*unused*/, pkt->dts);
678
    }
679
    assert(nus->last_pts != AV_NOPTS_VALUE);
680

    
681
    coded_pts = pkt->pts & ((1<<nus->msb_pts_shift)-1);
682
    if(ff_lsb2full(nus, coded_pts) != pkt->pts)
683
        coded_pts= pkt->pts + (1<<nus->msb_pts_shift);
684

    
685
    best_header_idx= find_best_header_idx(nut, pkt);
686

    
687
    best_length=INT_MAX;
688
    frame_code= -1;
689
    for(i=0; i<256; i++){
690
        int length= 0;
691
        FrameCode *fc= &nut->frame_code[i];
692
        int flags= fc->flags;
693

    
694
        if(flags & FLAG_INVALID)
695
            continue;
696
        needed_flags= get_needed_flags(nut, nus, fc, pkt);
697

    
698
        if(flags & FLAG_CODED){
699
            length++;
700
            flags = needed_flags;
701
        }
702

    
703
        if((flags & needed_flags) != needed_flags)
704
            continue;
705

    
706
        if((flags ^ needed_flags) & FLAG_KEY)
707
            continue;
708

    
709
        if(flags & FLAG_STREAM_ID)
710
            length+= ff_get_v_length(pkt->stream_index);
711

    
712
        if(pkt->size % fc->size_mul != fc->size_lsb)
713
            continue;
714
        if(flags & FLAG_SIZE_MSB)
715
            length += ff_get_v_length(pkt->size / fc->size_mul);
716

    
717
        if(flags & FLAG_CHECKSUM)
718
            length+=4;
719

    
720
        if(flags & FLAG_CODED_PTS)
721
            length += ff_get_v_length(coded_pts);
722

    
723
        if(   (flags & FLAG_CODED)
724
           && nut->header_len[best_header_idx] > nut->header_len[fc->header_idx]+1){
725
            flags |= FLAG_HEADER_IDX;
726
        }
727

    
728
        if(flags & FLAG_HEADER_IDX){
729
            length += 1 - nut->header_len[best_header_idx];
730
        }else{
731
            length -= nut->header_len[fc->header_idx];
732
        }
733

    
734
        length*=4;
735
        length+= !(flags & FLAG_CODED_PTS);
736
        length+= !(flags & FLAG_CHECKSUM);
737

    
738
        if(length < best_length){
739
            best_length= length;
740
            frame_code=i;
741
        }
742
    }
743
    assert(frame_code != -1);
744
    fc= &nut->frame_code[frame_code];
745
    flags= fc->flags;
746
    needed_flags= get_needed_flags(nut, nus, fc, pkt);
747
    header_idx= fc->header_idx;
748

    
749
    init_checksum(bc, ff_crc04C11DB7_update, 0);
750
    put_byte(bc, frame_code);
751
    if(flags & FLAG_CODED){
752
        ff_put_v(bc, (flags^needed_flags) & ~(FLAG_CODED));
753
        flags = needed_flags;
754
    }
755
    if(flags & FLAG_STREAM_ID)  ff_put_v(bc, pkt->stream_index);
756
    if(flags & FLAG_CODED_PTS)  ff_put_v(bc, coded_pts);
757
    if(flags & FLAG_SIZE_MSB)   ff_put_v(bc, pkt->size / fc->size_mul);
758
    if(flags & FLAG_HEADER_IDX) ff_put_v(bc, header_idx= best_header_idx);
759

    
760
    if(flags & FLAG_CHECKSUM)   put_le32(bc, get_checksum(bc));
761
    else                        get_checksum(bc);
762

    
763
    put_buffer(bc, pkt->data + nut->header_len[header_idx], pkt->size - nut->header_len[header_idx]);
764
    nus->last_flags= flags;
765
    nus->last_pts= pkt->pts;
766

    
767
    //FIXME just store one per syncpoint
768
    if(flags & FLAG_KEY)
769
        av_add_index_entry(
770
            s->streams[pkt->stream_index],
771
            nut->last_syncpoint_pos,
772
            pkt->pts,
773
            0,
774
            0,
775
            AVINDEX_KEYFRAME);
776

    
777
    return 0;
778
}
779

    
780
static int write_trailer(AVFormatContext *s){
781
    NUTContext *nut= s->priv_data;
782
    ByteIOContext *bc= s->pb;
783

    
784
    while(nut->header_count<3)
785
        write_headers(s, bc);
786
    put_flush_packet(bc);
787
    ff_nut_free_sp(nut);
788
    av_freep(&nut->stream);
789
    av_freep(&nut->time_base);
790

    
791
    return 0;
792
}
793

    
794
AVOutputFormat nut_muxer = {
795
    "nut",
796
    NULL_IF_CONFIG_SMALL("NUT format"),
797
    "video/x-nut",
798
    "nut",
799
    sizeof(NUTContext),
800
#if   CONFIG_LIBVORBIS
801
    CODEC_ID_VORBIS,
802
#elif CONFIG_LIBMP3LAME
803
    CODEC_ID_MP3,
804
#else
805
    CODEC_ID_MP2,
806
#endif
807
    CODEC_ID_MPEG4,
808
    write_header,
809
    write_packet,
810
    write_trailer,
811
    .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
812
    .codec_tag = (const AVCodecTag * const []){ ff_codec_bmp_tags, ff_nut_video_tags, ff_codec_wav_tags, ff_nut_subtitle_tags, 0 },
813
    .metadata_conv = ff_nut_metadata_conv,
814
};