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ffmpeg / libavformat / nutenc.c @ ffd5f098

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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
10
 * 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
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){
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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;
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;
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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
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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;
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;
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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;
185
                    ft->stream_id= stream_id;
186
                    ft->size_mul=frame_bytes + 2;
187
                    ft->size_lsb=frame_bytes + pred;
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                    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
/**
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(AVFormatContext *avctx, ByteIOContext *bc, AVStream *st, int i){
395
    NUTContext *nut = avctx->priv_data;
396
    AVCodecContext *codec = st->codec;
397
    put_v(bc, i);
398
    switch(codec->codec_type){
399
    case AVMEDIA_TYPE_VIDEO: put_v(bc, 0); break;
400
    case AVMEDIA_TYPE_AUDIO: put_v(bc, 1); break;
401
    case AVMEDIA_TYPE_SUBTITLE: put_v(bc, 2); break;
402
    default              : put_v(bc, 3); break;
403
    }
404
    put_v(bc, 4);
405
    if (codec->codec_tag){
406
        put_le32(bc, codec->codec_tag);
407
    }else
408
        return AVERROR(EINVAL);
409

    
410
    put_v(bc, nut->stream[i].time_base - nut->time_base);
411
    put_v(bc, nut->stream[i].msb_pts_shift);
412
    put_v(bc, nut->stream[i].max_pts_distance);
413
    put_v(bc, codec->has_b_frames);
414
    put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
415

    
416
    put_v(bc, codec->extradata_size);
417
    put_buffer(bc, codec->extradata, codec->extradata_size);
418

    
419
    switch(codec->codec_type){
420
    case AVMEDIA_TYPE_AUDIO:
421
        put_v(bc, codec->sample_rate);
422
        put_v(bc, 1);
423
        put_v(bc, codec->channels);
424
        break;
425
    case AVMEDIA_TYPE_VIDEO:
426
        put_v(bc, codec->width);
427
        put_v(bc, codec->height);
428

    
429
        if(st->sample_aspect_ratio.num<=0 || st->sample_aspect_ratio.den<=0){
430
            put_v(bc, 0);
431
            put_v(bc, 0);
432
        }else{
433
            put_v(bc, st->sample_aspect_ratio.num);
434
            put_v(bc, st->sample_aspect_ratio.den);
435
        }
436
        put_v(bc, 0); /* csp type -- unknown */
437
        break;
438
    default:
439
        break;
440
    }
441
    return 0;
442
}
443

    
444
static int add_info(ByteIOContext *bc, const char *type, const char *value){
445
    put_str(bc, type);
446
    put_s(bc, -1);
447
    put_str(bc, value);
448
    return 1;
449
}
450

    
451
static int write_globalinfo(NUTContext *nut, ByteIOContext *bc){
452
    AVFormatContext *s= nut->avf;
453
    AVMetadataTag *t = NULL;
454
    ByteIOContext *dyn_bc;
455
    uint8_t *dyn_buf=NULL;
456
    int count=0, dyn_size;
457
    int ret = url_open_dyn_buf(&dyn_bc);
458
    if(ret < 0)
459
        return ret;
460

    
461
    while ((t = av_metadata_get(s->metadata, "", t, AV_METADATA_IGNORE_SUFFIX)))
462
        count += add_info(dyn_bc, t->key, t->value);
463

    
464
    put_v(bc, 0); //stream_if_plus1
465
    put_v(bc, 0); //chapter_id
466
    put_v(bc, 0); //timestamp_start
467
    put_v(bc, 0); //length
468

    
469
    put_v(bc, count);
470

    
471
    dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf);
472
    put_buffer(bc, dyn_buf, dyn_size);
473
    av_free(dyn_buf);
474
    return 0;
475
}
476

    
477
static int write_streaminfo(NUTContext *nut, ByteIOContext *bc, int stream_id){
478
    AVFormatContext *s= nut->avf;
479
    AVStream* st = s->streams[stream_id];
480
    ByteIOContext *dyn_bc;
481
    uint8_t *dyn_buf=NULL;
482
    int count=0, dyn_size, i;
483
    int ret = url_open_dyn_buf(&dyn_bc);
484
    if(ret < 0)
485
        return ret;
486

    
487
    for (i=0; ff_nut_dispositions[i].flag; ++i) {
488
        if (st->disposition & ff_nut_dispositions[i].flag)
489
            count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str);
490
    }
491
    dyn_size = url_close_dyn_buf(dyn_bc, &dyn_buf);
492

    
493
    if (count) {
494
        put_v(bc, stream_id + 1); //stream_id_plus1
495
        put_v(bc, 0); //chapter_id
496
        put_v(bc, 0); //timestamp_start
497
        put_v(bc, 0); //length
498

    
499
        put_v(bc, count);
500

    
501
        put_buffer(bc, dyn_buf, dyn_size);
502
    }
503

    
504
    av_free(dyn_buf);
505
    return count;
506
}
507

    
508
static int write_headers(AVFormatContext *avctx, ByteIOContext *bc){
509
    NUTContext *nut = avctx->priv_data;
510
    ByteIOContext *dyn_bc;
511
    int i, ret;
512

    
513
    ret = url_open_dyn_buf(&dyn_bc);
514
    if(ret < 0)
515
        return ret;
516
    write_mainheader(nut, dyn_bc);
517
    put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE);
518

    
519
    for (i=0; i < nut->avf->nb_streams; i++){
520
        ret = url_open_dyn_buf(&dyn_bc);
521
        if(ret < 0)
522
            return ret;
523
        if ((ret = write_streamheader(avctx, dyn_bc, nut->avf->streams[i], i)) < 0)
524
            return ret;
525
        put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE);
526
    }
527

    
528
    ret = url_open_dyn_buf(&dyn_bc);
529
    if(ret < 0)
530
        return ret;
531
    write_globalinfo(nut, dyn_bc);
532
    put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
533

    
534
    for (i = 0; i < nut->avf->nb_streams; i++) {
535
        ret = url_open_dyn_buf(&dyn_bc);
536
        if(ret < 0)
537
            return ret;
538
        ret = write_streaminfo(nut, dyn_bc, i);
539
        if (ret < 0)
540
            return ret;
541
        if (ret > 0)
542
            put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
543
        else {
544
            uint8_t* buf;
545
            url_close_dyn_buf(dyn_bc, &buf);
546
            av_free(buf);
547
        }
548
    }
549

    
550
    nut->last_syncpoint_pos= INT_MIN;
551
    nut->header_count++;
552
    return 0;
553
}
554

    
555
static int write_header(AVFormatContext *s){
556
    NUTContext *nut = s->priv_data;
557
    ByteIOContext *bc = s->pb;
558
    int i, j, ret;
559

    
560
    nut->avf= s;
561

    
562
    nut->stream   = av_mallocz(sizeof(StreamContext)*s->nb_streams);
563
    nut->time_base= av_mallocz(sizeof(AVRational   )*s->nb_streams);
564

    
565
    for(i=0; i<s->nb_streams; i++){
566
        AVStream *st= s->streams[i];
567
        int ssize;
568
        AVRational time_base;
569
        ff_parse_specific_params(st->codec, &time_base.den, &ssize, &time_base.num);
570

    
571
        av_set_pts_info(st, 64, time_base.num, time_base.den);
572

    
573
        for(j=0; j<nut->time_base_count; j++){
574
            if(!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))){
575
                break;
576
            }
577
        }
578
        nut->time_base[j]= time_base;
579
        nut->stream[i].time_base= &nut->time_base[j];
580
        if(j==nut->time_base_count)
581
            nut->time_base_count++;
582

    
583
        if(av_q2d(time_base) >= 0.001)
584
            nut->stream[i].msb_pts_shift = 7;
585
        else
586
            nut->stream[i].msb_pts_shift = 14;
587
        nut->stream[i].max_pts_distance= FFMAX(1/av_q2d(time_base), 1);
588
    }
589

    
590
    nut->max_distance = MAX_DISTANCE;
591
    build_elision_headers(s);
592
    build_frame_code(s);
593
    assert(nut->frame_code['N'].flags == FLAG_INVALID);
594

    
595
    put_buffer(bc, ID_STRING, strlen(ID_STRING));
596
    put_byte(bc, 0);
597

    
598
    if ((ret = write_headers(s, bc)) < 0)
599
        return ret;
600

    
601
    put_flush_packet(bc);
602

    
603
    //FIXME index
604

    
605
    return 0;
606
}
607

    
608
static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc, AVPacket *pkt){
609
    int flags= 0;
610

    
611
    if(pkt->flags & AV_PKT_FLAG_KEY             ) flags |= FLAG_KEY;
612
    if(pkt->stream_index != fc->stream_id       ) flags |= FLAG_STREAM_ID;
613
    if(pkt->size / fc->size_mul                 ) flags |= FLAG_SIZE_MSB;
614
    if(pkt->pts - nus->last_pts != fc->pts_delta) flags |= FLAG_CODED_PTS;
615
    if(pkt->size > 2*nut->max_distance          ) flags |= FLAG_CHECKSUM;
616
    if(FFABS(pkt->pts - nus->last_pts)
617
                         > nus->max_pts_distance) flags |= FLAG_CHECKSUM;
618
    if(   pkt->size < nut->header_len[fc->header_idx]
619
       || (pkt->size > 4096 && fc->header_idx)
620
       || memcmp(pkt->data, nut->header[fc->header_idx], nut->header_len[fc->header_idx]))
621
                                                  flags |= FLAG_HEADER_IDX;
622

    
623
    return flags | (fc->flags & FLAG_CODED);
624
}
625

    
626
static int find_best_header_idx(NUTContext *nut, AVPacket *pkt){
627
    int i;
628
    int best_i  = 0;
629
    int best_len= 0;
630

    
631
    if(pkt->size > 4096)
632
        return 0;
633

    
634
    for(i=1; i<nut->header_count; i++){
635
        if(   pkt->size >= nut->header_len[i]
636
           &&  nut->header_len[i] > best_len
637
           && !memcmp(pkt->data, nut->header[i], nut->header_len[i])){
638
            best_i= i;
639
            best_len= nut->header_len[i];
640
        }
641
    }
642
    return best_i;
643
}
644

    
645
static int write_packet(AVFormatContext *s, AVPacket *pkt){
646
    NUTContext *nut = s->priv_data;
647
    StreamContext *nus= &nut->stream[pkt->stream_index];
648
    ByteIOContext *bc = s->pb, *dyn_bc;
649
    FrameCode *fc;
650
    int64_t coded_pts;
651
    int best_length, frame_code, flags, needed_flags, i, header_idx, best_header_idx;
652
    int key_frame = !!(pkt->flags & AV_PKT_FLAG_KEY);
653
    int store_sp=0;
654
    int ret;
655

    
656
    if(pkt->pts < 0)
657
        return -1;
658

    
659
    if(1LL<<(20+3*nut->header_count) <= url_ftell(bc))
660
        write_headers(s, bc);
661

    
662
    if(key_frame && !(nus->last_flags & FLAG_KEY))
663
        store_sp= 1;
664

    
665
    if(pkt->size + 30/*FIXME check*/ + url_ftell(bc) >= nut->last_syncpoint_pos + nut->max_distance)
666
        store_sp= 1;
667

    
668
//FIXME: Ensure store_sp is 1 in the first place.
669

    
670
    if(store_sp){
671
        Syncpoint *sp, dummy= {.pos= INT64_MAX};
672

    
673
        ff_nut_reset_ts(nut, *nus->time_base, pkt->dts);
674
        for(i=0; i<s->nb_streams; i++){
675
            AVStream *st= s->streams[i];
676
            int64_t dts_tb = av_rescale_rnd(pkt->dts,
677
                nus->time_base->num * (int64_t)nut->stream[i].time_base->den,
678
                nus->time_base->den * (int64_t)nut->stream[i].time_base->num,
679
                AV_ROUND_DOWN);
680
            int index= av_index_search_timestamp(st, dts_tb, AVSEEK_FLAG_BACKWARD);
681
            if(index>=0) dummy.pos= FFMIN(dummy.pos, st->index_entries[index].pos);
682
        }
683
        if(dummy.pos == INT64_MAX)
684
            dummy.pos= 0;
685
        sp= av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
686
                         NULL);
687

    
688
        nut->last_syncpoint_pos= url_ftell(bc);
689
        ret = url_open_dyn_buf(&dyn_bc);
690
        if(ret < 0)
691
            return ret;
692
        put_tt(nut, nus, dyn_bc, pkt->dts);
693
        put_v(dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos)>>4 : 0);
694
        put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE);
695

    
696
        ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0/*unused*/, pkt->dts);
697
    }
698
    assert(nus->last_pts != AV_NOPTS_VALUE);
699

    
700
    coded_pts = pkt->pts & ((1<<nus->msb_pts_shift)-1);
701
    if(ff_lsb2full(nus, coded_pts) != pkt->pts)
702
        coded_pts= pkt->pts + (1<<nus->msb_pts_shift);
703

    
704
    best_header_idx= find_best_header_idx(nut, pkt);
705

    
706
    best_length=INT_MAX;
707
    frame_code= -1;
708
    for(i=0; i<256; i++){
709
        int length= 0;
710
        FrameCode *fc= &nut->frame_code[i];
711
        int flags= fc->flags;
712

    
713
        if(flags & FLAG_INVALID)
714
            continue;
715
        needed_flags= get_needed_flags(nut, nus, fc, pkt);
716

    
717
        if(flags & FLAG_CODED){
718
            length++;
719
            flags = needed_flags;
720
        }
721

    
722
        if((flags & needed_flags) != needed_flags)
723
            continue;
724

    
725
        if((flags ^ needed_flags) & FLAG_KEY)
726
            continue;
727

    
728
        if(flags & FLAG_STREAM_ID)
729
            length+= get_length(pkt->stream_index);
730

    
731
        if(pkt->size % fc->size_mul != fc->size_lsb)
732
            continue;
733
        if(flags & FLAG_SIZE_MSB)
734
            length += get_length(pkt->size / fc->size_mul);
735

    
736
        if(flags & FLAG_CHECKSUM)
737
            length+=4;
738

    
739
        if(flags & FLAG_CODED_PTS)
740
            length += get_length(coded_pts);
741

    
742
        if(   (flags & FLAG_CODED)
743
           && nut->header_len[best_header_idx] > nut->header_len[fc->header_idx]+1){
744
            flags |= FLAG_HEADER_IDX;
745
        }
746

    
747
        if(flags & FLAG_HEADER_IDX){
748
            length += 1 - nut->header_len[best_header_idx];
749
        }else{
750
            length -= nut->header_len[fc->header_idx];
751
        }
752

    
753
        length*=4;
754
        length+= !(flags & FLAG_CODED_PTS);
755
        length+= !(flags & FLAG_CHECKSUM);
756

    
757
        if(length < best_length){
758
            best_length= length;
759
            frame_code=i;
760
        }
761
    }
762
    assert(frame_code != -1);
763
    fc= &nut->frame_code[frame_code];
764
    flags= fc->flags;
765
    needed_flags= get_needed_flags(nut, nus, fc, pkt);
766
    header_idx= fc->header_idx;
767

    
768
    init_checksum(bc, ff_crc04C11DB7_update, 0);
769
    put_byte(bc, frame_code);
770
    if(flags & FLAG_CODED){
771
        put_v(bc, (flags^needed_flags) & ~(FLAG_CODED));
772
        flags = needed_flags;
773
    }
774
    if(flags & FLAG_STREAM_ID)  put_v(bc, pkt->stream_index);
775
    if(flags & FLAG_CODED_PTS)  put_v(bc, coded_pts);
776
    if(flags & FLAG_SIZE_MSB)   put_v(bc, pkt->size / fc->size_mul);
777
    if(flags & FLAG_HEADER_IDX) put_v(bc, header_idx= best_header_idx);
778

    
779
    if(flags & FLAG_CHECKSUM)   put_le32(bc, get_checksum(bc));
780
    else                        get_checksum(bc);
781

    
782
    put_buffer(bc, pkt->data + nut->header_len[header_idx], pkt->size - nut->header_len[header_idx]);
783
    nus->last_flags= flags;
784
    nus->last_pts= pkt->pts;
785

    
786
    //FIXME just store one per syncpoint
787
    if(flags & FLAG_KEY)
788
        av_add_index_entry(
789
            s->streams[pkt->stream_index],
790
            nut->last_syncpoint_pos,
791
            pkt->pts,
792
            0,
793
            0,
794
            AVINDEX_KEYFRAME);
795

    
796
    return 0;
797
}
798

    
799
static int write_trailer(AVFormatContext *s){
800
    NUTContext *nut= s->priv_data;
801
    ByteIOContext *bc= s->pb;
802

    
803
    while(nut->header_count<3)
804
        write_headers(s, bc);
805
    put_flush_packet(bc);
806
    ff_nut_free_sp(nut);
807
    av_freep(&nut->stream);
808
    av_freep(&nut->time_base);
809

    
810
    return 0;
811
}
812

    
813
AVOutputFormat nut_muxer = {
814
    "nut",
815
    NULL_IF_CONFIG_SMALL("NUT format"),
816
    "video/x-nut",
817
    "nut",
818
    sizeof(NUTContext),
819
#if   CONFIG_LIBVORBIS
820
    CODEC_ID_VORBIS,
821
#elif CONFIG_LIBMP3LAME
822
    CODEC_ID_MP3,
823
#else
824
    CODEC_ID_MP2,
825
#endif
826
    CODEC_ID_MPEG4,
827
    write_header,
828
    write_packet,
829
    write_trailer,
830
    .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
831
    .codec_tag = (const AVCodecTag * const []){ ff_codec_bmp_tags, ff_nut_video_tags, ff_codec_wav_tags, ff_nut_subtitle_tags, 0 },
832
    .metadata_conv = ff_nut_metadata_conv,
833
};