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1
/*
2
 * Rate control for video encoders
3
 *
4
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * 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,
14
 * 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
21
 */
22

    
23
/**
24
 * @file ratecontrol.c
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 * Rate control for video encoders.
26
 */
27

    
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#include "avcodec.h"
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#include "dsputil.h"
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#include "ratecontrol.h"
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#include "mpegvideo.h"
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#include "eval.h"
33

    
34
#undef NDEBUG // Always check asserts, the speed effect is far too small to disable them.
35
#include <assert.h>
36

    
37
#ifndef M_E
38
#define M_E 2.718281828
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#endif
40

    
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static int init_pass2(MpegEncContext *s);
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static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num);
43

    
44
void ff_write_pass1_stats(MpegEncContext *s){
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    snprintf(s->avctx->stats_out, 256, "in:%d out:%d type:%d q:%d itex:%d ptex:%d mv:%d misc:%d fcode:%d bcode:%d mc-var:%d var:%d icount:%d skipcount:%d hbits:%d;\n",
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            s->current_picture_ptr->display_picture_number, s->current_picture_ptr->coded_picture_number, s->pict_type,
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            s->current_picture.quality, s->i_tex_bits, s->p_tex_bits, s->mv_bits, s->misc_bits,
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            s->f_code, s->b_code, s->current_picture.mc_mb_var_sum, s->current_picture.mb_var_sum, s->i_count, s->skip_count, s->header_bits);
49
}
50

    
51
static inline double qp2bits(RateControlEntry *rce, double qp){
52
    if(qp<=0.0){
53
        av_log(NULL, AV_LOG_ERROR, "qp<=0.0\n");
54
    }
55
    return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ qp;
56
}
57

    
58
static inline double bits2qp(RateControlEntry *rce, double bits){
59
    if(bits<0.9){
60
        av_log(NULL, AV_LOG_ERROR, "bits<0.9\n");
61
    }
62
    return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ bits;
63
}
64

    
65
int ff_rate_control_init(MpegEncContext *s)
66
{
67
    RateControlContext *rcc= &s->rc_context;
68
    int i;
69
    char *error = NULL;
70
    static const char *const_names[]={
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        "PI",
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        "E",
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        "iTex",
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        "pTex",
75
        "tex",
76
        "mv",
77
        "fCode",
78
        "iCount",
79
        "mcVar",
80
        "var",
81
        "isI",
82
        "isP",
83
        "isB",
84
        "avgQP",
85
        "qComp",
86
/*        "lastIQP",
87
        "lastPQP",
88
        "lastBQP",
89
        "nextNonBQP",*/
90
        "avgIITex",
91
        "avgPITex",
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        "avgPPTex",
93
        "avgBPTex",
94
        "avgTex",
95
        NULL
96
    };
97
    static double (*func1[])(void *, double)={
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        (void *)bits2qp,
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        (void *)qp2bits,
100
        NULL
101
    };
102
    static const char *func1_names[]={
103
        "bits2qp",
104
        "qp2bits",
105
        NULL
106
    };
107
    emms_c();
108

    
109
    rcc->rc_eq_eval = ff_parse(s->avctx->rc_eq, const_names, func1, func1_names, NULL, NULL, &error);
110
    if (!rcc->rc_eq_eval) {
111
        av_log(s->avctx, AV_LOG_ERROR, "Error parsing rc_eq \"%s\": %s\n", s->avctx->rc_eq, error? error : "");
112
        return -1;
113
    }
114

    
115
    for(i=0; i<5; i++){
116
        rcc->pred[i].coeff= FF_QP2LAMBDA * 7.0;
117
        rcc->pred[i].count= 1.0;
118

    
119
        rcc->pred[i].decay= 0.4;
120
        rcc->i_cplx_sum [i]=
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        rcc->p_cplx_sum [i]=
122
        rcc->mv_bits_sum[i]=
123
        rcc->qscale_sum [i]=
124
        rcc->frame_count[i]= 1; // 1 is better cuz of 1/0 and such
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        rcc->last_qscale_for[i]=FF_QP2LAMBDA * 5;
126
    }
127
    rcc->buffer_index= s->avctx->rc_initial_buffer_occupancy;
128

    
129
    if(s->flags&CODEC_FLAG_PASS2){
130
        int i;
131
        char *p;
132

    
133
        /* find number of pics */
134
        p= s->avctx->stats_in;
135
        for(i=-1; p; i++){
136
            p= strchr(p+1, ';');
137
        }
138
        i+= s->max_b_frames;
139
        if(i<=0 || i>=INT_MAX / sizeof(RateControlEntry))
140
            return -1;
141
        rcc->entry = (RateControlEntry*)av_mallocz(i*sizeof(RateControlEntry));
142
        rcc->num_entries= i;
143

    
144
        /* init all to skipped p frames (with b frames we might have a not encoded frame at the end FIXME) */
145
        for(i=0; i<rcc->num_entries; i++){
146
            RateControlEntry *rce= &rcc->entry[i];
147
            rce->pict_type= rce->new_pict_type=P_TYPE;
148
            rce->qscale= rce->new_qscale=FF_QP2LAMBDA * 2;
149
            rce->misc_bits= s->mb_num + 10;
150
            rce->mb_var_sum= s->mb_num*100;
151
        }
152

    
153
        /* read stats */
154
        p= s->avctx->stats_in;
155
        for(i=0; i<rcc->num_entries - s->max_b_frames; i++){
156
            RateControlEntry *rce;
157
            int picture_number;
158
            int e;
159
            char *next;
160

    
161
            next= strchr(p, ';');
162
            if(next){
163
                (*next)=0; //sscanf in unbelievably slow on looong strings //FIXME copy / do not write
164
                next++;
165
            }
166
            e= sscanf(p, " in:%d ", &picture_number);
167

    
168
            assert(picture_number >= 0);
169
            assert(picture_number < rcc->num_entries);
170
            rce= &rcc->entry[picture_number];
171

    
172
            e+=sscanf(p, " in:%*d out:%*d type:%d q:%f itex:%d ptex:%d mv:%d misc:%d fcode:%d bcode:%d mc-var:%d var:%d icount:%d skipcount:%d hbits:%d",
173
                   &rce->pict_type, &rce->qscale, &rce->i_tex_bits, &rce->p_tex_bits, &rce->mv_bits, &rce->misc_bits,
174
                   &rce->f_code, &rce->b_code, &rce->mc_mb_var_sum, &rce->mb_var_sum, &rce->i_count, &rce->skip_count, &rce->header_bits);
175
            if(e!=14){
176
                av_log(s->avctx, AV_LOG_ERROR, "statistics are damaged at line %d, parser out=%d\n", i, e);
177
                return -1;
178
            }
179

    
180
            p= next;
181
        }
182

    
183
        if(init_pass2(s) < 0) return -1;
184

    
185
        //FIXME maybe move to end
186
        if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID) {
187
#ifdef CONFIG_XVID
188
            return ff_xvid_rate_control_init(s);
189
#else
190
            av_log(s->avctx, AV_LOG_ERROR, "XviD ratecontrol requires libavcodec compiled with XviD support\n");
191
            return -1;
192
#endif
193
        }
194
    }
195

    
196
    if(!(s->flags&CODEC_FLAG_PASS2)){
197

    
198
        rcc->short_term_qsum=0.001;
199
        rcc->short_term_qcount=0.001;
200

    
201
        rcc->pass1_rc_eq_output_sum= 0.001;
202
        rcc->pass1_wanted_bits=0.001;
203

    
204
        if(s->avctx->qblur > 1.0){
205
            av_log(s->avctx, AV_LOG_ERROR, "qblur too large\n");
206
            return -1;
207
        }
208
        /* init stuff with the user specified complexity */
209
        if(s->avctx->rc_initial_cplx){
210
            for(i=0; i<60*30; i++){
211
                double bits= s->avctx->rc_initial_cplx * (i/10000.0 + 1.0)*s->mb_num;
212
                RateControlEntry rce;
213
                double q;
214

    
215
                if     (i%((s->gop_size+3)/4)==0) rce.pict_type= I_TYPE;
216
                else if(i%(s->max_b_frames+1))    rce.pict_type= B_TYPE;
217
                else                              rce.pict_type= P_TYPE;
218

    
219
                rce.new_pict_type= rce.pict_type;
220
                rce.mc_mb_var_sum= bits*s->mb_num/100000;
221
                rce.mb_var_sum   = s->mb_num;
222
                rce.qscale   = FF_QP2LAMBDA * 2;
223
                rce.f_code   = 2;
224
                rce.b_code   = 1;
225
                rce.misc_bits= 1;
226

    
227
                if(s->pict_type== I_TYPE){
228
                    rce.i_count   = s->mb_num;
229
                    rce.i_tex_bits= bits;
230
                    rce.p_tex_bits= 0;
231
                    rce.mv_bits= 0;
232
                }else{
233
                    rce.i_count   = 0; //FIXME we do know this approx
234
                    rce.i_tex_bits= 0;
235
                    rce.p_tex_bits= bits*0.9;
236
                    rce.mv_bits= bits*0.1;
237
                }
238
                rcc->i_cplx_sum [rce.pict_type] += rce.i_tex_bits*rce.qscale;
239
                rcc->p_cplx_sum [rce.pict_type] += rce.p_tex_bits*rce.qscale;
240
                rcc->mv_bits_sum[rce.pict_type] += rce.mv_bits;
241
                rcc->frame_count[rce.pict_type] ++;
242

    
243
                bits= rce.i_tex_bits + rce.p_tex_bits;
244

    
245
                q= get_qscale(s, &rce, rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum, i);
246
                rcc->pass1_wanted_bits+= s->bit_rate/(1/av_q2d(s->avctx->time_base)); //FIXME missbehaves a little for variable fps
247
            }
248
        }
249

    
250
    }
251

    
252
    return 0;
253
}
254

    
255
void ff_rate_control_uninit(MpegEncContext *s)
256
{
257
    RateControlContext *rcc= &s->rc_context;
258
    emms_c();
259

    
260
    ff_eval_free(rcc->rc_eq_eval);
261
    av_freep(&rcc->entry);
262

    
263
#ifdef CONFIG_XVID
264
    if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID)
265
        ff_xvid_rate_control_uninit(s);
266
#endif
267
}
268

    
269
int ff_vbv_update(MpegEncContext *s, int frame_size){
270
    RateControlContext *rcc= &s->rc_context;
271
    const double fps= 1/av_q2d(s->avctx->time_base);
272
    const int buffer_size= s->avctx->rc_buffer_size;
273
    const double min_rate= s->avctx->rc_min_rate/fps;
274
    const double max_rate= s->avctx->rc_max_rate/fps;
275

    
276
//printf("%d %f %d %f %f\n", buffer_size, rcc->buffer_index, frame_size, min_rate, max_rate);
277
    if(buffer_size){
278
        int left;
279

    
280
        rcc->buffer_index-= frame_size;
281
        if(rcc->buffer_index < 0){
282
            av_log(s->avctx, AV_LOG_ERROR, "rc buffer underflow\n");
283
            rcc->buffer_index= 0;
284
        }
285

    
286
        left= buffer_size - rcc->buffer_index - 1;
287
        rcc->buffer_index += av_clip(left, min_rate, max_rate);
288

    
289
        if(rcc->buffer_index > buffer_size){
290
            int stuffing= ceil((rcc->buffer_index - buffer_size)/8);
291

    
292
            if(stuffing < 4 && s->codec_id == CODEC_ID_MPEG4)
293
                stuffing=4;
294
            rcc->buffer_index -= 8*stuffing;
295

    
296
            if(s->avctx->debug & FF_DEBUG_RC)
297
                av_log(s->avctx, AV_LOG_DEBUG, "stuffing %d bytes\n", stuffing);
298

    
299
            return stuffing;
300
        }
301
    }
302
    return 0;
303
}
304

    
305
/**
306
 * modifies the bitrate curve from pass1 for one frame
307
 */
308
static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num){
309
    RateControlContext *rcc= &s->rc_context;
310
    AVCodecContext *a= s->avctx;
311
    double q, bits;
312
    const int pict_type= rce->new_pict_type;
313
    const double mb_num= s->mb_num;
314
    int i;
315

    
316
    double const_values[]={
317
        M_PI,
318
        M_E,
319
        rce->i_tex_bits*rce->qscale,
320
        rce->p_tex_bits*rce->qscale,
321
        (rce->i_tex_bits + rce->p_tex_bits)*(double)rce->qscale,
322
        rce->mv_bits/mb_num,
323
        rce->pict_type == B_TYPE ? (rce->f_code + rce->b_code)*0.5 : rce->f_code,
324
        rce->i_count/mb_num,
325
        rce->mc_mb_var_sum/mb_num,
326
        rce->mb_var_sum/mb_num,
327
        rce->pict_type == I_TYPE,
328
        rce->pict_type == P_TYPE,
329
        rce->pict_type == B_TYPE,
330
        rcc->qscale_sum[pict_type] / (double)rcc->frame_count[pict_type],
331
        a->qcompress,
332
/*        rcc->last_qscale_for[I_TYPE],
333
        rcc->last_qscale_for[P_TYPE],
334
        rcc->last_qscale_for[B_TYPE],
335
        rcc->next_non_b_qscale,*/
336
        rcc->i_cplx_sum[I_TYPE] / (double)rcc->frame_count[I_TYPE],
337
        rcc->i_cplx_sum[P_TYPE] / (double)rcc->frame_count[P_TYPE],
338
        rcc->p_cplx_sum[P_TYPE] / (double)rcc->frame_count[P_TYPE],
339
        rcc->p_cplx_sum[B_TYPE] / (double)rcc->frame_count[B_TYPE],
340
        (rcc->i_cplx_sum[pict_type] + rcc->p_cplx_sum[pict_type]) / (double)rcc->frame_count[pict_type],
341
        0
342
    };
343

    
344
    bits= ff_parse_eval(rcc->rc_eq_eval, const_values, rce);
345
    if (isnan(bits)) {
346
        av_log(s->avctx, AV_LOG_ERROR, "Error evaluating rc_eq \"%s\"\n", s->avctx->rc_eq);
347
        return -1;
348
    }
349

    
350
    rcc->pass1_rc_eq_output_sum+= bits;
351
    bits*=rate_factor;
352
    if(bits<0.0) bits=0.0;
353
    bits+= 1.0; //avoid 1/0 issues
354

    
355
    /* user override */
356
    for(i=0; i<s->avctx->rc_override_count; i++){
357
        RcOverride *rco= s->avctx->rc_override;
358
        if(rco[i].start_frame > frame_num) continue;
359
        if(rco[i].end_frame   < frame_num) continue;
360

    
361
        if(rco[i].qscale)
362
            bits= qp2bits(rce, rco[i].qscale); //FIXME move at end to really force it?
363
        else
364
            bits*= rco[i].quality_factor;
365
    }
366

    
367
    q= bits2qp(rce, bits);
368

    
369
    /* I/B difference */
370
    if     (pict_type==I_TYPE && s->avctx->i_quant_factor<0.0)
371
        q= -q*s->avctx->i_quant_factor + s->avctx->i_quant_offset;
372
    else if(pict_type==B_TYPE && s->avctx->b_quant_factor<0.0)
373
        q= -q*s->avctx->b_quant_factor + s->avctx->b_quant_offset;
374

    
375
    return q;
376
}
377

    
378
static double get_diff_limited_q(MpegEncContext *s, RateControlEntry *rce, double q){
379
    RateControlContext *rcc= &s->rc_context;
380
    AVCodecContext *a= s->avctx;
381
    const int pict_type= rce->new_pict_type;
382
    const double last_p_q    = rcc->last_qscale_for[P_TYPE];
383
    const double last_non_b_q= rcc->last_qscale_for[rcc->last_non_b_pict_type];
384

    
385
    if     (pict_type==I_TYPE && (a->i_quant_factor>0.0 || rcc->last_non_b_pict_type==P_TYPE))
386
        q= last_p_q    *FFABS(a->i_quant_factor) + a->i_quant_offset;
387
    else if(pict_type==B_TYPE && a->b_quant_factor>0.0)
388
        q= last_non_b_q*    a->b_quant_factor  + a->b_quant_offset;
389

    
390
    /* last qscale / qdiff stuff */
391
    if(rcc->last_non_b_pict_type==pict_type || pict_type!=I_TYPE){
392
        double last_q= rcc->last_qscale_for[pict_type];
393
        const int maxdiff= FF_QP2LAMBDA * a->max_qdiff;
394

    
395
        if     (q > last_q + maxdiff) q= last_q + maxdiff;
396
        else if(q < last_q - maxdiff) q= last_q - maxdiff;
397
    }
398

    
399
    rcc->last_qscale_for[pict_type]= q; //Note we cannot do that after blurring
400

    
401
    if(pict_type!=B_TYPE)
402
        rcc->last_non_b_pict_type= pict_type;
403

    
404
    return q;
405
}
406

    
407
/**
408
 * gets the qmin & qmax for pict_type
409
 */
410
static void get_qminmax(int *qmin_ret, int *qmax_ret, MpegEncContext *s, int pict_type){
411
    int qmin= s->avctx->lmin;
412
    int qmax= s->avctx->lmax;
413

    
414
    assert(qmin <= qmax);
415

    
416
    if(pict_type==B_TYPE){
417
        qmin= (int)(qmin*FFABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5);
418
        qmax= (int)(qmax*FFABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5);
419
    }else if(pict_type==I_TYPE){
420
        qmin= (int)(qmin*FFABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5);
421
        qmax= (int)(qmax*FFABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5);
422
    }
423

    
424
    qmin= av_clip(qmin, 1, FF_LAMBDA_MAX);
425
    qmax= av_clip(qmax, 1, FF_LAMBDA_MAX);
426

    
427
    if(qmax<qmin) qmax= qmin;
428

    
429
    *qmin_ret= qmin;
430
    *qmax_ret= qmax;
431
}
432

    
433
static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q, int frame_num){
434
    RateControlContext *rcc= &s->rc_context;
435
    int qmin, qmax;
436
    double bits;
437
    const int pict_type= rce->new_pict_type;
438
    const double buffer_size= s->avctx->rc_buffer_size;
439
    const double fps= 1/av_q2d(s->avctx->time_base);
440
    const double min_rate= s->avctx->rc_min_rate / fps;
441
    const double max_rate= s->avctx->rc_max_rate / fps;
442

    
443
    get_qminmax(&qmin, &qmax, s, pict_type);
444

    
445
    /* modulation */
446
    if(s->avctx->rc_qmod_freq && frame_num%s->avctx->rc_qmod_freq==0 && pict_type==P_TYPE)
447
        q*= s->avctx->rc_qmod_amp;
448

    
449
    bits= qp2bits(rce, q);
450
//printf("q:%f\n", q);
451
    /* buffer overflow/underflow protection */
452
    if(buffer_size){
453
        double expected_size= rcc->buffer_index;
454
        double q_limit;
455

    
456
        if(min_rate){
457
            double d= 2*(buffer_size - expected_size)/buffer_size;
458
            if(d>1.0) d=1.0;
459
            else if(d<0.0001) d=0.0001;
460
            q*= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
461

    
462
            q_limit= bits2qp(rce, FFMAX((min_rate - buffer_size + rcc->buffer_index)*3, 1));
463
            if(q > q_limit){
464
                if(s->avctx->debug&FF_DEBUG_RC){
465
                    av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
466
                }
467
                q= q_limit;
468
            }
469
        }
470

    
471
        if(max_rate){
472
            double d= 2*expected_size/buffer_size;
473
            if(d>1.0) d=1.0;
474
            else if(d<0.0001) d=0.0001;
475
            q/= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
476

    
477
            q_limit= bits2qp(rce, FFMAX(rcc->buffer_index/3, 1));
478
            if(q < q_limit){
479
                if(s->avctx->debug&FF_DEBUG_RC){
480
                    av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
481
                }
482
                q= q_limit;
483
            }
484
        }
485
    }
486
//printf("q:%f max:%f min:%f size:%f index:%d bits:%f agr:%f\n", q,max_rate, min_rate, buffer_size, rcc->buffer_index, bits, s->avctx->rc_buffer_aggressivity);
487
    if(s->avctx->rc_qsquish==0.0 || qmin==qmax){
488
        if     (q<qmin) q=qmin;
489
        else if(q>qmax) q=qmax;
490
    }else{
491
        double min2= log(qmin);
492
        double max2= log(qmax);
493

    
494
        q= log(q);
495
        q= (q - min2)/(max2-min2) - 0.5;
496
        q*= -4.0;
497
        q= 1.0/(1.0 + exp(q));
498
        q= q*(max2-min2) + min2;
499

    
500
        q= exp(q);
501
    }
502

    
503
    return q;
504
}
505

    
506
//----------------------------------
507
// 1 Pass Code
508

    
509
static double predict_size(Predictor *p, double q, double var)
510
{
511
     return p->coeff*var / (q*p->count);
512
}
513

    
514
/*
515
static double predict_qp(Predictor *p, double size, double var)
516
{
517
//printf("coeff:%f, count:%f, var:%f, size:%f//\n", p->coeff, p->count, var, size);
518
     return p->coeff*var / (size*p->count);
519
}
520
*/
521

    
522
static void update_predictor(Predictor *p, double q, double var, double size)
523
{
524
    double new_coeff= size*q / (var + 1);
525
    if(var<10) return;
526

    
527
    p->count*= p->decay;
528
    p->coeff*= p->decay;
529
    p->count++;
530
    p->coeff+= new_coeff;
531
}
532

    
533
static void adaptive_quantization(MpegEncContext *s, double q){
534
    int i;
535
    const float lumi_masking= s->avctx->lumi_masking / (128.0*128.0);
536
    const float dark_masking= s->avctx->dark_masking / (128.0*128.0);
537
    const float temp_cplx_masking= s->avctx->temporal_cplx_masking;
538
    const float spatial_cplx_masking = s->avctx->spatial_cplx_masking;
539
    const float p_masking = s->avctx->p_masking;
540
    const float border_masking = s->avctx->border_masking;
541
    float bits_sum= 0.0;
542
    float cplx_sum= 0.0;
543
    float cplx_tab[s->mb_num];
544
    float bits_tab[s->mb_num];
545
    const int qmin= s->avctx->mb_lmin;
546
    const int qmax= s->avctx->mb_lmax;
547
    Picture * const pic= &s->current_picture;
548
    const int mb_width = s->mb_width;
549
    const int mb_height = s->mb_height;
550

    
551
    for(i=0; i<s->mb_num; i++){
552
        const int mb_xy= s->mb_index2xy[i];
553
        float temp_cplx= sqrt(pic->mc_mb_var[mb_xy]); //FIXME merge in pow()
554
        float spat_cplx= sqrt(pic->mb_var[mb_xy]);
555
        const int lumi= pic->mb_mean[mb_xy];
556
        float bits, cplx, factor;
557
        int mb_x = mb_xy % s->mb_stride;
558
        int mb_y = mb_xy / s->mb_stride;
559
        int mb_distance;
560
        float mb_factor = 0.0;
561
#if 0
562
        if(spat_cplx < q/3) spat_cplx= q/3; //FIXME finetune
563
        if(temp_cplx < q/3) temp_cplx= q/3; //FIXME finetune
564
#endif
565
        if(spat_cplx < 4) spat_cplx= 4; //FIXME finetune
566
        if(temp_cplx < 4) temp_cplx= 4; //FIXME finetune
567

    
568
        if((s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_INTRA)){//FIXME hq mode
569
            cplx= spat_cplx;
570
            factor= 1.0 + p_masking;
571
        }else{
572
            cplx= temp_cplx;
573
            factor= pow(temp_cplx, - temp_cplx_masking);
574
        }
575
        factor*=pow(spat_cplx, - spatial_cplx_masking);
576

    
577
        if(lumi>127)
578
            factor*= (1.0 - (lumi-128)*(lumi-128)*lumi_masking);
579
        else
580
            factor*= (1.0 - (lumi-128)*(lumi-128)*dark_masking);
581

    
582
        if(mb_x < mb_width/5){
583
            mb_distance = mb_width/5 - mb_x;
584
            mb_factor = (float)mb_distance / (float)(mb_width/5);
585
        }else if(mb_x > 4*mb_width/5){
586
            mb_distance = mb_x - 4*mb_width/5;
587
            mb_factor = (float)mb_distance / (float)(mb_width/5);
588
        }
589
        if(mb_y < mb_height/5){
590
            mb_distance = mb_height/5 - mb_y;
591
            mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5));
592
        }else if(mb_y > 4*mb_height/5){
593
            mb_distance = mb_y - 4*mb_height/5;
594
            mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5));
595
        }
596

    
597
        factor*= 1.0 - border_masking*mb_factor;
598

    
599
        if(factor<0.00001) factor= 0.00001;
600

    
601
        bits= cplx*factor;
602
        cplx_sum+= cplx;
603
        bits_sum+= bits;
604
        cplx_tab[i]= cplx;
605
        bits_tab[i]= bits;
606
    }
607

    
608
    /* handle qmin/qmax clipping */
609
    if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
610
        float factor= bits_sum/cplx_sum;
611
        for(i=0; i<s->mb_num; i++){
612
            float newq= q*cplx_tab[i]/bits_tab[i];
613
            newq*= factor;
614

    
615
            if     (newq > qmax){
616
                bits_sum -= bits_tab[i];
617
                cplx_sum -= cplx_tab[i]*q/qmax;
618
            }
619
            else if(newq < qmin){
620
                bits_sum -= bits_tab[i];
621
                cplx_sum -= cplx_tab[i]*q/qmin;
622
            }
623
        }
624
        if(bits_sum < 0.001) bits_sum= 0.001;
625
        if(cplx_sum < 0.001) cplx_sum= 0.001;
626
    }
627

    
628
    for(i=0; i<s->mb_num; i++){
629
        const int mb_xy= s->mb_index2xy[i];
630
        float newq= q*cplx_tab[i]/bits_tab[i];
631
        int intq;
632

    
633
        if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
634
            newq*= bits_sum/cplx_sum;
635
        }
636

    
637
        intq= (int)(newq + 0.5);
638

    
639
        if     (intq > qmax) intq= qmax;
640
        else if(intq < qmin) intq= qmin;
641
//if(i%s->mb_width==0) printf("\n");
642
//printf("%2d%3d ", intq, ff_sqrt(s->mc_mb_var[i]));
643
        s->lambda_table[mb_xy]= intq;
644
    }
645
}
646

    
647
void ff_get_2pass_fcode(MpegEncContext *s){
648
    RateControlContext *rcc= &s->rc_context;
649
    int picture_number= s->picture_number;
650
    RateControlEntry *rce;
651

    
652
    rce= &rcc->entry[picture_number];
653
    s->f_code= rce->f_code;
654
    s->b_code= rce->b_code;
655
}
656

    
657
//FIXME rd or at least approx for dquant
658

    
659
float ff_rate_estimate_qscale(MpegEncContext *s, int dry_run)
660
{
661
    float q;
662
    int qmin, qmax;
663
    float br_compensation;
664
    double diff;
665
    double short_term_q;
666
    double fps;
667
    int picture_number= s->picture_number;
668
    int64_t wanted_bits;
669
    RateControlContext *rcc= &s->rc_context;
670
    AVCodecContext *a= s->avctx;
671
    RateControlEntry local_rce, *rce;
672
    double bits;
673
    double rate_factor;
674
    int var;
675
    const int pict_type= s->pict_type;
676
    Picture * const pic= &s->current_picture;
677
    emms_c();
678

    
679
#ifdef CONFIG_XVID
680
    if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID)
681
        return ff_xvid_rate_estimate_qscale(s, dry_run);
682
#endif
683

    
684
    get_qminmax(&qmin, &qmax, s, pict_type);
685

    
686
    fps= 1/av_q2d(s->avctx->time_base);
687
//printf("input_pic_num:%d pic_num:%d frame_rate:%d\n", s->input_picture_number, s->picture_number, s->frame_rate);
688
        /* update predictors */
689
    if(picture_number>2 && !dry_run){
690
        const int last_var= s->last_pict_type == I_TYPE ? rcc->last_mb_var_sum : rcc->last_mc_mb_var_sum;
691
        update_predictor(&rcc->pred[s->last_pict_type], rcc->last_qscale, sqrt(last_var), s->frame_bits);
692
    }
693

    
694
    if(s->flags&CODEC_FLAG_PASS2){
695
        assert(picture_number>=0);
696
        assert(picture_number<rcc->num_entries);
697
        rce= &rcc->entry[picture_number];
698
        wanted_bits= rce->expected_bits;
699
    }else{
700
        rce= &local_rce;
701
        wanted_bits= (uint64_t)(s->bit_rate*(double)picture_number/fps);
702
    }
703

    
704
    diff= s->total_bits - wanted_bits;
705
    br_compensation= (a->bit_rate_tolerance - diff)/a->bit_rate_tolerance;
706
    if(br_compensation<=0.0) br_compensation=0.001;
707

    
708
    var= pict_type == I_TYPE ? pic->mb_var_sum : pic->mc_mb_var_sum;
709

    
710
    short_term_q = 0; /* avoid warning */
711
    if(s->flags&CODEC_FLAG_PASS2){
712
        if(pict_type!=I_TYPE)
713
            assert(pict_type == rce->new_pict_type);
714

    
715
        q= rce->new_qscale / br_compensation;
716
//printf("%f %f %f last:%d var:%d type:%d//\n", q, rce->new_qscale, br_compensation, s->frame_bits, var, pict_type);
717
    }else{
718
        rce->pict_type=
719
        rce->new_pict_type= pict_type;
720
        rce->mc_mb_var_sum= pic->mc_mb_var_sum;
721
        rce->mb_var_sum   = pic->   mb_var_sum;
722
        rce->qscale   = FF_QP2LAMBDA * 2;
723
        rce->f_code   = s->f_code;
724
        rce->b_code   = s->b_code;
725
        rce->misc_bits= 1;
726

    
727
        bits= predict_size(&rcc->pred[pict_type], rce->qscale, sqrt(var));
728
        if(pict_type== I_TYPE){
729
            rce->i_count   = s->mb_num;
730
            rce->i_tex_bits= bits;
731
            rce->p_tex_bits= 0;
732
            rce->mv_bits= 0;
733
        }else{
734
            rce->i_count   = 0; //FIXME we do know this approx
735
            rce->i_tex_bits= 0;
736
            rce->p_tex_bits= bits*0.9;
737

    
738
            rce->mv_bits= bits*0.1;
739
        }
740
        rcc->i_cplx_sum [pict_type] += rce->i_tex_bits*rce->qscale;
741
        rcc->p_cplx_sum [pict_type] += rce->p_tex_bits*rce->qscale;
742
        rcc->mv_bits_sum[pict_type] += rce->mv_bits;
743
        rcc->frame_count[pict_type] ++;
744

    
745
        bits= rce->i_tex_bits + rce->p_tex_bits;
746
        rate_factor= rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum * br_compensation;
747

    
748
        q= get_qscale(s, rce, rate_factor, picture_number);
749
        if (q < 0)
750
            return -1;
751

    
752
        assert(q>0.0);
753
//printf("%f ", q);
754
        q= get_diff_limited_q(s, rce, q);
755
//printf("%f ", q);
756
        assert(q>0.0);
757

    
758
        if(pict_type==P_TYPE || s->intra_only){ //FIXME type dependent blur like in 2-pass
759
            rcc->short_term_qsum*=a->qblur;
760
            rcc->short_term_qcount*=a->qblur;
761

    
762
            rcc->short_term_qsum+= q;
763
            rcc->short_term_qcount++;
764
//printf("%f ", q);
765
            q= short_term_q= rcc->short_term_qsum/rcc->short_term_qcount;
766
//printf("%f ", q);
767
        }
768
        assert(q>0.0);
769

    
770
        q= modify_qscale(s, rce, q, picture_number);
771

    
772
        rcc->pass1_wanted_bits+= s->bit_rate/fps;
773

    
774
        assert(q>0.0);
775
    }
776

    
777
    if(s->avctx->debug&FF_DEBUG_RC){
778
        av_log(s->avctx, AV_LOG_DEBUG, "%c qp:%d<%2.1f<%d %d want:%d total:%d comp:%f st_q:%2.2f size:%d var:%d/%d br:%d fps:%d\n",
779
        av_get_pict_type_char(pict_type), qmin, q, qmax, picture_number, (int)wanted_bits/1000, (int)s->total_bits/1000,
780
        br_compensation, short_term_q, s->frame_bits, pic->mb_var_sum, pic->mc_mb_var_sum, s->bit_rate/1000, (int)fps
781
        );
782
    }
783

    
784
    if     (q<qmin) q=qmin;
785
    else if(q>qmax) q=qmax;
786

    
787
    if(s->adaptive_quant)
788
        adaptive_quantization(s, q);
789
    else
790
        q= (int)(q + 0.5);
791

    
792
    if(!dry_run){
793
        rcc->last_qscale= q;
794
        rcc->last_mc_mb_var_sum= pic->mc_mb_var_sum;
795
        rcc->last_mb_var_sum= pic->mb_var_sum;
796
    }
797
#if 0
798
{
799
    static int mvsum=0, texsum=0;
800
    mvsum += s->mv_bits;
801
    texsum += s->i_tex_bits + s->p_tex_bits;
802
    printf("%d %d//\n\n", mvsum, texsum);
803
}
804
#endif
805
    return q;
806
}
807

    
808
//----------------------------------------------
809
// 2-Pass code
810

    
811
static int init_pass2(MpegEncContext *s)
812
{
813
    RateControlContext *rcc= &s->rc_context;
814
    AVCodecContext *a= s->avctx;
815
    int i, toobig;
816
    double fps= 1/av_q2d(s->avctx->time_base);
817
    double complexity[5]={0,0,0,0,0};   // aproximate bits at quant=1
818
    uint64_t const_bits[5]={0,0,0,0,0}; // quantizer independent bits
819
    uint64_t all_const_bits;
820
    uint64_t all_available_bits= (uint64_t)(s->bit_rate*(double)rcc->num_entries/fps);
821
    double rate_factor=0;
822
    double step;
823
    //int last_i_frame=-10000000;
824
    const int filter_size= (int)(a->qblur*4) | 1;
825
    double expected_bits;
826
    double *qscale, *blured_qscale, qscale_sum;
827

    
828
    /* find complexity & const_bits & decide the pict_types */
829
    for(i=0; i<rcc->num_entries; i++){
830
        RateControlEntry *rce= &rcc->entry[i];
831

    
832
        rce->new_pict_type= rce->pict_type;
833
        rcc->i_cplx_sum [rce->pict_type] += rce->i_tex_bits*rce->qscale;
834
        rcc->p_cplx_sum [rce->pict_type] += rce->p_tex_bits*rce->qscale;
835
        rcc->mv_bits_sum[rce->pict_type] += rce->mv_bits;
836
        rcc->frame_count[rce->pict_type] ++;
837

    
838
        complexity[rce->new_pict_type]+= (rce->i_tex_bits+ rce->p_tex_bits)*(double)rce->qscale;
839
        const_bits[rce->new_pict_type]+= rce->mv_bits + rce->misc_bits;
840
    }
841
    all_const_bits= const_bits[I_TYPE] + const_bits[P_TYPE] + const_bits[B_TYPE];
842

    
843
    if(all_available_bits < all_const_bits){
844
        av_log(s->avctx, AV_LOG_ERROR, "requested bitrate is too low\n");
845
        return -1;
846
    }
847

    
848
    qscale= av_malloc(sizeof(double)*rcc->num_entries);
849
    blured_qscale= av_malloc(sizeof(double)*rcc->num_entries);
850
    toobig = 0;
851

    
852
    for(step=256*256; step>0.0000001; step*=0.5){
853
        expected_bits=0;
854
        rate_factor+= step;
855

    
856
        rcc->buffer_index= s->avctx->rc_buffer_size/2;
857

    
858
        /* find qscale */
859
        for(i=0; i<rcc->num_entries; i++){
860
            qscale[i]= get_qscale(s, &rcc->entry[i], rate_factor, i);
861
        }
862
        assert(filter_size%2==1);
863

    
864
        /* fixed I/B QP relative to P mode */
865
        for(i=rcc->num_entries-1; i>=0; i--){
866
            RateControlEntry *rce= &rcc->entry[i];
867

    
868
            qscale[i]= get_diff_limited_q(s, rce, qscale[i]);
869
        }
870

    
871
        /* smooth curve */
872
        for(i=0; i<rcc->num_entries; i++){
873
            RateControlEntry *rce= &rcc->entry[i];
874
            const int pict_type= rce->new_pict_type;
875
            int j;
876
            double q=0.0, sum=0.0;
877

    
878
            for(j=0; j<filter_size; j++){
879
                int index= i+j-filter_size/2;
880
                double d= index-i;
881
                double coeff= a->qblur==0 ? 1.0 : exp(-d*d/(a->qblur * a->qblur));
882

    
883
                if(index < 0 || index >= rcc->num_entries) continue;
884
                if(pict_type != rcc->entry[index].new_pict_type) continue;
885
                q+= qscale[index] * coeff;
886
                sum+= coeff;
887
            }
888
            blured_qscale[i]= q/sum;
889
        }
890

    
891
        /* find expected bits */
892
        for(i=0; i<rcc->num_entries; i++){
893
            RateControlEntry *rce= &rcc->entry[i];
894
            double bits;
895
            rce->new_qscale= modify_qscale(s, rce, blured_qscale[i], i);
896
            bits= qp2bits(rce, rce->new_qscale) + rce->mv_bits + rce->misc_bits;
897
//printf("%d %f\n", rce->new_bits, blured_qscale[i]);
898
            bits += 8*ff_vbv_update(s, bits);
899

    
900
            rce->expected_bits= expected_bits;
901
            expected_bits += bits;
902
        }
903

    
904
        /*
905
        av_log(s->avctx, AV_LOG_INFO,
906
            "expected_bits: %f all_available_bits: %d rate_factor: %f\n",
907
            expected_bits, (int)all_available_bits, rate_factor);
908
        */
909
        if(expected_bits > all_available_bits) {
910
            rate_factor-= step;
911
            ++toobig;
912
        }
913
    }
914
    av_free(qscale);
915
    av_free(blured_qscale);
916

    
917
    /* check bitrate calculations and print info */
918
    qscale_sum = 0.0;
919
    for(i=0; i<rcc->num_entries; i++){
920
        /* av_log(s->avctx, AV_LOG_DEBUG, "[lavc rc] entry[%d].new_qscale = %.3f  qp = %.3f\n",
921
            i, rcc->entry[i].new_qscale, rcc->entry[i].new_qscale / FF_QP2LAMBDA); */
922
        qscale_sum += av_clip(rcc->entry[i].new_qscale / FF_QP2LAMBDA, s->avctx->qmin, s->avctx->qmax);
923
    }
924
    assert(toobig <= 40);
925
    av_log(s->avctx, AV_LOG_DEBUG,
926
        "[lavc rc] requested bitrate: %d bps  expected bitrate: %d bps\n",
927
        s->bit_rate,
928
        (int)(expected_bits / ((double)all_available_bits/s->bit_rate)));
929
    av_log(s->avctx, AV_LOG_DEBUG,
930
        "[lavc rc] estimated target average qp: %.3f\n",
931
        (float)qscale_sum / rcc->num_entries);
932
    if (toobig == 0) {
933
        av_log(s->avctx, AV_LOG_INFO,
934
            "[lavc rc] Using all of requested bitrate is not "
935
            "necessary for this video with these parameters.\n");
936
    } else if (toobig == 40) {
937
        av_log(s->avctx, AV_LOG_ERROR,
938
            "[lavc rc] Error: bitrate too low for this video "
939
            "with these parameters.\n");
940
        return -1;
941
    } else if (fabs(expected_bits/all_available_bits - 1.0) > 0.01) {
942
        av_log(s->avctx, AV_LOG_ERROR,
943
            "[lavc rc] Error: 2pass curve failed to converge\n");
944
        return -1;
945
    }
946

    
947
    return 0;
948
}