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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
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 "nut.h"
23

    
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#define TRACE
25

    
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static void build_frame_code(AVFormatContext *s){
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    NUTContext *nut = s->priv_data;
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    int key_frame, index, pred, stream_id;
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    int start=1;
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    int end= 254;
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    int keyframe_0_esc= s->nb_streams > 2;
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    int pred_table[10];
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    FrameCode *ft;
34

    
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    ft= &nut->frame_code[start];
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    ft->flags= FLAG_CODED;
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    ft->size_mul=1;
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    ft->pts_delta=1;
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    start++;
40

    
41
    if(keyframe_0_esc){
42
        /* keyframe = 0 escape */
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        FrameCode *ft= &nut->frame_code[start];
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        ft->flags= FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS;
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        ft->size_mul=1;
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        start++;
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    }
48

    
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    for(stream_id= 0; stream_id<s->nb_streams; stream_id++){
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        int start2= start + (end-start)*stream_id / s->nb_streams;
51
        int end2  = start + (end-start)*(stream_id+1) / s->nb_streams;
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        AVCodecContext *codec = s->streams[stream_id]->codec;
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        int is_audio= codec->codec_type == CODEC_TYPE_AUDIO;
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        int intra_only= /*codec->intra_only || */is_audio;
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        int pred_count;
56

    
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        for(key_frame=0; key_frame<2; key_frame++){
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            if(intra_only && keyframe_0_esc && key_frame==0)
59
                continue;
60

    
61
            {
62
                FrameCode *ft= &nut->frame_code[start2];
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                ft->flags= FLAG_KEY*key_frame;
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                ft->flags|= FLAG_SIZE_MSB | FLAG_CODED_PTS;
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                ft->stream_id= stream_id;
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                ft->size_mul=1;
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                start2++;
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            }
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        }
70

    
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        key_frame= intra_only;
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#if 1
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        if(is_audio){
74
            int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);
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            int pts;
76
            for(pts=0; pts<2; pts++){
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                for(pred=0; pred<2; pred++){
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                    FrameCode *ft= &nut->frame_code[start2];
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                    ft->flags= FLAG_KEY*key_frame;
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                    ft->stream_id= stream_id;
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                    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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                    start2++;
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                }
86
            }
87
        }else{
88
            FrameCode *ft= &nut->frame_code[start2];
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            ft->flags= FLAG_KEY | FLAG_SIZE_MSB;
90
            ft->stream_id= stream_id;
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            ft->size_mul=1;
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            ft->pts_delta=1;
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            start2++;
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        }
95
#endif
96

    
97
        if(codec->has_b_frames){
98
            pred_count=5;
99
            pred_table[0]=-2;
100
            pred_table[1]=-1;
101
            pred_table[2]=1;
102
            pred_table[3]=3;
103
            pred_table[4]=4;
104
        }else if(codec->codec_id == CODEC_ID_VORBIS){
105
            pred_count=3;
106
            pred_table[0]=2;
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            pred_table[1]=9;
108
            pred_table[2]=16;
109
        }else{
110
            pred_count=1;
111
            pred_table[0]=1;
112
        }
113

    
114
        for(pred=0; pred<pred_count; pred++){
115
            int start3= start2 + (end2-start2)*pred / pred_count;
116
            int end3  = start2 + (end2-start2)*(pred+1) / pred_count;
117

    
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            for(index=start3; index<end3; index++){
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                FrameCode *ft= &nut->frame_code[index];
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                ft->flags= FLAG_KEY*key_frame;
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                ft->flags|= FLAG_SIZE_MSB;
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                ft->stream_id= stream_id;
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//FIXME use single byte size and pred from last
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                ft->size_mul= end3-start3;
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                ft->size_lsb= index - start3;
126
                ft->pts_delta= pred_table[pred];
127
            }
128
        }
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    }
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    memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N'));
131
    nut->frame_code[  0].flags=
132
    nut->frame_code[255].flags=
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    nut->frame_code['N'].flags= FLAG_INVALID;
134
}
135

    
136
/**
137
 * Gets the length in bytes which is needed to store val as v.
138
 */
139
static int get_length(uint64_t val){
140
    int i=1;
141

    
142
    while(val>>=7)
143
        i++;
144

    
145
    return i;
146
}
147

    
148
static void put_v(ByteIOContext *bc, uint64_t val){
149
    int i= get_length(val);
150

    
151
    while(--i>0)
152
        put_byte(bc, 128 | (val>>(7*i)));
153

    
154
    put_byte(bc, val&127);
155
}
156

    
157
static void put_t(NUTContext *nut, StreamContext *nus, ByteIOContext *bc, uint64_t val){
158
    val *= nut->time_base_count;
159
    val += nus->time_base - nut->time_base;
160
    put_v(bc, val);
161
}
162

    
163
/**
164
 * stores a string as vb.
165
 */
166
static void put_str(ByteIOContext *bc, const char *string){
167
    int len= strlen(string);
168

    
169
    put_v(bc, len);
170
    put_buffer(bc, string, len);
171
}
172

    
173
static void put_s(ByteIOContext *bc, int64_t val){
174
    put_v(bc, 2*FFABS(val) - (val>0));
175
}
176

    
177
#ifdef TRACE
178
static inline void put_v_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
179
    av_log(NULL, AV_LOG_DEBUG, "put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
180

    
181
    put_v(bc, v);
182
}
183

    
184
static inline void put_s_trace(ByteIOContext *bc, int64_t v, char *file, char *func, int line){
185
    av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
186

    
187
    put_s(bc, v);
188
}
189
#define put_v(bc, v)  put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
190
#define put_s(bc, v)  put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
191
#endif
192

    
193
//FIXME remove calculate_checksum
194
static void put_packet(NUTContext *nut, ByteIOContext *bc, ByteIOContext *dyn_bc, int calculate_checksum, uint64_t startcode){
195
    uint8_t *dyn_buf=NULL;
196
    int dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf);
197
    int forw_ptr= dyn_size + 4*calculate_checksum;
198

    
199
    if(forw_ptr > 4096)
200
        init_checksum(bc, av_crc04C11DB7_update, 0);
201
    put_be64(bc, startcode);
202
    put_v(bc, forw_ptr);
203
    if(forw_ptr > 4096)
204
        put_le32(bc, get_checksum(bc));
205

    
206
    if(calculate_checksum)
207
        init_checksum(bc, av_crc04C11DB7_update, 0);
208
    put_buffer(bc, dyn_buf, dyn_size);
209
    if(calculate_checksum)
210
        put_le32(bc, get_checksum(bc));
211

    
212
    av_free(dyn_buf);
213
}
214

    
215
static void write_mainheader(NUTContext *nut, ByteIOContext *bc){
216
    int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields;
217

    
218
    put_v(bc, 2); /* version */
219
    put_v(bc, nut->avf->nb_streams);
220
    put_v(bc, MAX_DISTANCE);
221
    put_v(bc, nut->time_base_count);
222

    
223
    for(i=0; i<nut->time_base_count; i++){
224
        put_v(bc, nut->time_base[i].num);
225
        put_v(bc, nut->time_base[i].den);
226
    }
227

    
228
    tmp_pts=0;
229
    tmp_mul=1;
230
    tmp_stream=0;
231
    for(i=0; i<256;){
232
        tmp_fields=0;
233
        tmp_size=0;
234
//        tmp_res=0;
235
        if(tmp_pts    != nut->frame_code[i].pts_delta) tmp_fields=1;
236
        if(tmp_mul    != nut->frame_code[i].size_mul ) tmp_fields=2;
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        if(tmp_stream != nut->frame_code[i].stream_id) tmp_fields=3;
238
        if(tmp_size   != nut->frame_code[i].size_lsb ) tmp_fields=4;
239
//        if(tmp_res    != nut->frame_code[i].res            ) tmp_fields=5;
240

    
241
        tmp_pts   = nut->frame_code[i].pts_delta;
242
        tmp_flags = nut->frame_code[i].flags;
243
        tmp_stream= nut->frame_code[i].stream_id;
244
        tmp_mul   = nut->frame_code[i].size_mul;
245
        tmp_size  = nut->frame_code[i].size_lsb;
246
//        tmp_res   = nut->frame_code[i].res;
247

    
248
        for(j=0; i<256; j++,i++){
249
            if(i == 'N'){
250
                j--;
251
                continue;
252
            }
253
            if(nut->frame_code[i].pts_delta != tmp_pts   ) break;
254
            if(nut->frame_code[i].flags     != tmp_flags ) break;
255
            if(nut->frame_code[i].stream_id != tmp_stream) break;
256
            if(nut->frame_code[i].size_mul  != tmp_mul   ) break;
257
            if(nut->frame_code[i].size_lsb  != tmp_size+j) break;
258
//            if(nut->frame_code[i].res       != tmp_res   ) break;
259
        }
260
        if(j != tmp_mul - tmp_size) tmp_fields=6;
261

    
262
        put_v(bc, tmp_flags);
263
        put_v(bc, tmp_fields);
264
        if(tmp_fields>0) put_s(bc, tmp_pts);
265
        if(tmp_fields>1) put_v(bc, tmp_mul);
266
        if(tmp_fields>2) put_v(bc, tmp_stream);
267
        if(tmp_fields>3) put_v(bc, tmp_size);
268
        if(tmp_fields>4) put_v(bc, 0 /*tmp_res*/);
269
        if(tmp_fields>5) put_v(bc, j);
270
    }
271
}
272

    
273
static int write_streamheader(NUTContext *nut, ByteIOContext *bc, AVCodecContext *codec, int i){
274
    put_v(bc, i);
275
    switch(codec->codec_type){
276
    case CODEC_TYPE_VIDEO: put_v(bc, 0); break;
277
    case CODEC_TYPE_AUDIO: put_v(bc, 1); break;
278
//    case CODEC_TYPE_TEXT : put_v(bc, 2); break;
279
    default              : put_v(bc, 3); break;
280
    }
281
    put_v(bc, 4);
282
    if (codec->codec_tag){
283
        put_le32(bc, codec->codec_tag);
284
    }else
285
        return -1;
286

    
287
    put_v(bc, nut->stream[i].time_base - nut->time_base);
288
    put_v(bc, nut->stream[i].msb_pts_shift);
289
    put_v(bc, nut->stream[i].max_pts_distance);
290
    put_v(bc, codec->has_b_frames);
291
    put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
292

    
293
    put_v(bc, codec->extradata_size);
294
    put_buffer(bc, codec->extradata, codec->extradata_size);
295

    
296
    switch(codec->codec_type){
297
    case CODEC_TYPE_AUDIO:
298
        put_v(bc, codec->sample_rate);
299
        put_v(bc, 1);
300
        put_v(bc, codec->channels);
301
        break;
302
    case CODEC_TYPE_VIDEO:
303
        put_v(bc, codec->width);
304
        put_v(bc, codec->height);
305
        put_v(bc, codec->sample_aspect_ratio.num);
306
        put_v(bc, codec->sample_aspect_ratio.den);
307
        put_v(bc, 0); /* csp type -- unknown */
308
        break;
309
    default:
310
        break;
311
    }
312
    return 0;
313
}
314

    
315
static void write_headers(NUTContext *nut, ByteIOContext *bc){
316
    ByteIOContext dyn_bc;
317
    int i;
318

    
319
    url_open_dyn_buf(&dyn_bc);
320
    write_mainheader(nut, &dyn_bc);
321
    put_packet(nut, bc, &dyn_bc, 1, MAIN_STARTCODE);
322

    
323
    for (i=0; i < nut->avf->nb_streams; i++){
324
        AVCodecContext *codec = nut->avf->streams[i]->codec;
325

    
326
        url_open_dyn_buf(&dyn_bc);
327
        write_streamheader(nut, &dyn_bc, codec, i);
328
        put_packet(nut, bc, &dyn_bc, 1, STREAM_STARTCODE);
329
    }
330
}
331

    
332
static int write_header(AVFormatContext *s){
333
    NUTContext *nut = s->priv_data;
334
    ByteIOContext *bc = &s->pb;
335
    int i, j;
336

    
337
    nut->avf= s;
338

    
339
    nut->stream   = av_mallocz(sizeof(StreamContext)*s->nb_streams);
340
    nut->time_base= av_mallocz(sizeof(AVRational   )*s->nb_streams);
341

    
342
    for(i=0; i<s->nb_streams; i++){
343
        AVStream *st= s->streams[i];
344
        int ssize;
345
        AVRational time_base;
346
        ff_parse_specific_params(st->codec, &time_base.den, &ssize, &time_base.num);
347

    
348
        av_set_pts_info(st, 64, time_base.num, time_base.den);
349

    
350
        for(j=0; j<nut->time_base_count; j++){
351
            if(!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))){
352
                break;
353
            }
354
        }
355
        nut->time_base[j]= time_base;
356
        nut->stream[i].time_base= &nut->time_base[j];
357
        if(j==nut->time_base_count)
358
            nut->time_base_count++;
359

    
360
        if(av_q2d(time_base) >= 0.001)
361
            nut->stream[i].msb_pts_shift = 7;
362
        else
363
            nut->stream[i].msb_pts_shift = 14;
364
        nut->stream[i].max_pts_distance= FFMAX(1/av_q2d(time_base), 1);
365
    }
366

    
367
    build_frame_code(s);
368
    assert(nut->frame_code['N'].flags == FLAG_INVALID);
369

    
370
    put_buffer(bc, ID_STRING, strlen(ID_STRING));
371
    put_byte(bc, 0);
372

    
373
    write_headers(nut, bc);
374

    
375
    put_flush_packet(bc);
376

    
377
    //FIXME info header, header repeation, ...
378

    
379
    return 0;
380
}
381

    
382
static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc, AVPacket *pkt){
383
    int flags= 0;
384

    
385
    if(pkt->flags & PKT_FLAG_KEY                ) flags |= FLAG_KEY;
386
    if(pkt->stream_index != fc->stream_id       ) flags |= FLAG_STREAM_ID;
387
    if(pkt->size / fc->size_mul                 ) flags |= FLAG_SIZE_MSB;
388
    if(pkt->pts - nus->last_pts != fc->pts_delta) flags |= FLAG_CODED_PTS;
389
    if(pkt->size > 2*nut->max_distance          ) flags |= FLAG_CHECKSUM;
390
    if(FFABS(pkt->pts - nus->last_pts)
391
                         > nus->max_pts_distance) flags |= FLAG_CHECKSUM;
392

    
393
    return flags;
394
}
395

    
396
static int write_packet(AVFormatContext *s, AVPacket *pkt){
397
    NUTContext *nut = s->priv_data;
398
    StreamContext *nus= &nut->stream[pkt->stream_index];
399
    ByteIOContext *bc = &s->pb, dyn_bc;
400
    FrameCode *fc;
401
    int64_t coded_pts;
402
    int best_length, frame_code, flags, needed_flags, i;
403
    int key_frame = !!(pkt->flags & PKT_FLAG_KEY);
404
    int store_sp=0;
405

    
406
    if(key_frame && !!(nus->last_flags & FLAG_KEY))
407
        store_sp= 1;
408

    
409
    if(pkt->size + 30/*FIXME check*/ + url_ftell(bc) >= nut->last_syncpoint_pos + nut->max_distance)
410
        store_sp= 1;
411

    
412
//FIXME ensure store_sp is 1 for the first thing
413

    
414
    if(store_sp){
415
        ff_nut_reset_ts(nut, *nus->time_base, pkt->dts);
416

    
417
        nut->last_syncpoint_pos= url_ftell(bc);
418
        url_open_dyn_buf(&dyn_bc);
419
        put_t(nut, nus, &dyn_bc, pkt->dts);
420
        put_v(&dyn_bc, 0); //FIXME back_ptr_div16
421
        put_packet(nut, bc, &dyn_bc, 1, SYNCPOINT_STARTCODE);
422
    }
423
    assert(nus->last_pts != AV_NOPTS_VALUE);
424

    
425
    coded_pts = pkt->pts & ((1<<nus->msb_pts_shift)-1);
426
    if(ff_lsb2full(nus, coded_pts) != pkt->pts)
427
        coded_pts= pkt->pts + (1<<nus->msb_pts_shift);
428

    
429
    best_length=INT_MAX;
430
    frame_code= -1;
431
    for(i=0; i<256; i++){
432
        int length= 0;
433
        FrameCode *fc= &nut->frame_code[i];
434
        int flags= fc->flags;
435

    
436
        if(flags & FLAG_INVALID)
437
            continue;
438
        needed_flags= get_needed_flags(nut, nus, fc, pkt);
439

    
440
        if(flags & FLAG_CODED){
441
            length++;
442
            flags &= ~needed_flags;
443
            flags |=  needed_flags;
444
        }
445

    
446
        if((flags & needed_flags) != needed_flags)
447
            continue;
448

    
449
        if((flags ^ needed_flags) & FLAG_KEY)
450
            continue;
451

    
452
        if(flags & FLAG_STREAM_ID)
453
            length+= get_length(pkt->stream_index);
454

    
455
        if(pkt->size % fc->size_mul != fc->size_lsb)
456
            continue;
457
        if(flags & FLAG_SIZE_MSB)
458
            length += get_length(pkt->size / fc->size_mul);
459

    
460
        if(flags & FLAG_CHECKSUM)
461
            length+=4;
462

    
463
        if(flags & FLAG_CODED_PTS)
464
            length += get_length(coded_pts);
465

    
466
        length*=4;
467
        length+= !(flags & FLAG_CODED_PTS);
468
        length+= !(flags & FLAG_CHECKSUM);
469

    
470
        if(length < best_length){
471
            best_length= length;
472
            frame_code=i;
473
        }
474
    }
475
    assert(frame_code != -1);
476
    fc= &nut->frame_code[frame_code];
477
    flags= fc->flags;
478
    needed_flags= get_needed_flags(nut, nus, fc, pkt);
479

    
480
    init_checksum(bc, av_crc04C11DB7_update, 0);
481
    put_byte(bc, frame_code);
482
    if(flags & FLAG_CODED){
483
        put_v(bc, (flags^needed_flags) & ~(FLAG_CODED));
484
        flags = needed_flags;
485
    }
486
    if(flags & FLAG_STREAM_ID)  put_v(bc, pkt->stream_index);
487
    if(flags & FLAG_CODED_PTS)  put_v(bc, coded_pts);
488
    if(flags & FLAG_SIZE_MSB)   put_v(bc, pkt->size / fc->size_mul);
489

    
490
    if(flags & FLAG_CHECKSUM)   put_le32(bc, get_checksum(bc));
491
    else                        get_checksum(bc);
492

    
493
    put_buffer(bc, pkt->data, pkt->size);
494
    nus->last_flags= flags;
495
    return 0;
496
}
497

    
498
static int write_trailer(AVFormatContext *s){
499
    NUTContext *nut= s->priv_data;
500
    ByteIOContext *bc= &s->pb;
501

    
502
    write_headers(nut, bc);
503
    put_flush_packet(bc);
504

    
505
    return 0;
506
}
507

    
508
AVOutputFormat nut_muxer = {
509
    "nut",
510
    "nut format",
511
    "video/x-nut",
512
    "nut",
513
    sizeof(NUTContext),
514
#ifdef CONFIG_LIBVORBIS
515
    CODEC_ID_VORBIS,
516
#elif defined(CONFIG_LIBMP3LAME)
517
    CODEC_ID_MP3,
518
#else
519
    CODEC_ID_MP2, /* AC3 needs liba52 decoder */
520
#endif
521
    CODEC_ID_MPEG4,
522
    write_header,
523
    write_packet,
524
    write_trailer,
525
    .flags = AVFMT_GLOBALHEADER,
526
    .codec_tag= (const AVCodecTag*[]){codec_bmp_tags, codec_wav_tags, 0},
527
};