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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 Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
9
 * 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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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * 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 Libav; 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
/**
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 * @file
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 * Rate control for video encoders.
26
 */
27

    
28
#include "libavutil/intmath.h"
29
#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 "libavutil/eval.h"
34

    
35
#undef NDEBUG // Always check asserts, the speed effect is far too small to disable them.
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#include <assert.h>
37

    
38
#ifndef M_E
39
#define M_E 2.718281828
40
#endif
41

    
42
static int init_pass2(MpegEncContext *s);
43
static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num);
44

    
45
void ff_write_pass1_stats(MpegEncContext *s){
46
    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);
50
}
51

    
52
static inline double qp2bits(RateControlEntry *rce, double qp){
53
    if(qp<=0.0){
54
        av_log(NULL, AV_LOG_ERROR, "qp<=0.0\n");
55
    }
56
    return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ qp;
57
}
58

    
59
static inline double bits2qp(RateControlEntry *rce, double bits){
60
    if(bits<0.9){
61
        av_log(NULL, AV_LOG_ERROR, "bits<0.9\n");
62
    }
63
    return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ bits;
64
}
65

    
66
int ff_rate_control_init(MpegEncContext *s)
67
{
68
    RateControlContext *rcc= &s->rc_context;
69
    int i, res;
70
    static const char * const const_names[]={
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        "PI",
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        "E",
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        "iTex",
74
        "pTex",
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        "tex",
76
        "mv",
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        "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 (* const func1[])(void *, double)={
98
        (void *)bits2qp,
99
        (void *)qp2bits,
100
        NULL
101
    };
102
    static const char * const func1_names[]={
103
        "bits2qp",
104
        "qp2bits",
105
        NULL
106
    };
107
    emms_c();
108

    
109
    res = av_expr_parse(&rcc->rc_eq_eval, s->avctx->rc_eq ? s->avctx->rc_eq : "tex^qComp", const_names, func1_names, func1, NULL, NULL, 0, s->avctx);
110
    if (res < 0) {
111
        av_log(s->avctx, AV_LOG_ERROR, "Error parsing rc_eq \"%s\"\n", s->avctx->rc_eq);
112
        return res;
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]=
121
        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 because of 1/0 and such
125
        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 = 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=FF_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
#if CONFIG_LIBXVID
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

    
214
                if     (i%((s->gop_size+3)/4)==0) rce.pict_type= FF_I_TYPE;
215
                else if(i%(s->max_b_frames+1))    rce.pict_type= FF_B_TYPE;
216
                else                              rce.pict_type= FF_P_TYPE;
217

    
218
                rce.new_pict_type= rce.pict_type;
219
                rce.mc_mb_var_sum= bits*s->mb_num/100000;
220
                rce.mb_var_sum   = s->mb_num;
221
                rce.qscale   = FF_QP2LAMBDA * 2;
222
                rce.f_code   = 2;
223
                rce.b_code   = 1;
224
                rce.misc_bits= 1;
225

    
226
                if(s->pict_type== FF_I_TYPE){
227
                    rce.i_count   = s->mb_num;
228
                    rce.i_tex_bits= bits;
229
                    rce.p_tex_bits= 0;
230
                    rce.mv_bits= 0;
231
                }else{
232
                    rce.i_count   = 0; //FIXME we do know this approx
233
                    rce.i_tex_bits= 0;
234
                    rce.p_tex_bits= bits*0.9;
235
                    rce.mv_bits= bits*0.1;
236
                }
237
                rcc->i_cplx_sum [rce.pict_type] += rce.i_tex_bits*rce.qscale;
238
                rcc->p_cplx_sum [rce.pict_type] += rce.p_tex_bits*rce.qscale;
239
                rcc->mv_bits_sum[rce.pict_type] += rce.mv_bits;
240
                rcc->frame_count[rce.pict_type] ++;
241

    
242
                get_qscale(s, &rce, rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum, i);
243
                rcc->pass1_wanted_bits+= s->bit_rate/(1/av_q2d(s->avctx->time_base)); //FIXME misbehaves a little for variable fps
244
            }
245
        }
246

    
247
    }
248

    
249
    return 0;
250
}
251

    
252
void ff_rate_control_uninit(MpegEncContext *s)
253
{
254
    RateControlContext *rcc= &s->rc_context;
255
    emms_c();
256

    
257
    av_expr_free(rcc->rc_eq_eval);
258
    av_freep(&rcc->entry);
259

    
260
#if CONFIG_LIBXVID
261
    if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID)
262
        ff_xvid_rate_control_uninit(s);
263
#endif
264
}
265

    
266
int ff_vbv_update(MpegEncContext *s, int frame_size){
267
    RateControlContext *rcc= &s->rc_context;
268
    const double fps= 1/av_q2d(s->avctx->time_base);
269
    const int buffer_size= s->avctx->rc_buffer_size;
270
    const double min_rate= s->avctx->rc_min_rate/fps;
271
    const double max_rate= s->avctx->rc_max_rate/fps;
272

    
273
//printf("%d %f %d %f %f\n", buffer_size, rcc->buffer_index, frame_size, min_rate, max_rate);
274
    if(buffer_size){
275
        int left;
276

    
277
        rcc->buffer_index-= frame_size;
278
        if(rcc->buffer_index < 0){
279
            av_log(s->avctx, AV_LOG_ERROR, "rc buffer underflow\n");
280
            rcc->buffer_index= 0;
281
        }
282

    
283
        left= buffer_size - rcc->buffer_index - 1;
284
        rcc->buffer_index += av_clip(left, min_rate, max_rate);
285

    
286
        if(rcc->buffer_index > buffer_size){
287
            int stuffing= ceil((rcc->buffer_index - buffer_size)/8);
288

    
289
            if(stuffing < 4 && s->codec_id == CODEC_ID_MPEG4)
290
                stuffing=4;
291
            rcc->buffer_index -= 8*stuffing;
292

    
293
            if(s->avctx->debug & FF_DEBUG_RC)
294
                av_log(s->avctx, AV_LOG_DEBUG, "stuffing %d bytes\n", stuffing);
295

    
296
            return stuffing;
297
        }
298
    }
299
    return 0;
300
}
301

    
302
/**
303
 * modifies the bitrate curve from pass1 for one frame
304
 */
305
static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num){
306
    RateControlContext *rcc= &s->rc_context;
307
    AVCodecContext *a= s->avctx;
308
    double q, bits;
309
    const int pict_type= rce->new_pict_type;
310
    const double mb_num= s->mb_num;
311
    int i;
312

    
313
    double const_values[]={
314
        M_PI,
315
        M_E,
316
        rce->i_tex_bits*rce->qscale,
317
        rce->p_tex_bits*rce->qscale,
318
        (rce->i_tex_bits + rce->p_tex_bits)*(double)rce->qscale,
319
        rce->mv_bits/mb_num,
320
        rce->pict_type == FF_B_TYPE ? (rce->f_code + rce->b_code)*0.5 : rce->f_code,
321
        rce->i_count/mb_num,
322
        rce->mc_mb_var_sum/mb_num,
323
        rce->mb_var_sum/mb_num,
324
        rce->pict_type == FF_I_TYPE,
325
        rce->pict_type == FF_P_TYPE,
326
        rce->pict_type == FF_B_TYPE,
327
        rcc->qscale_sum[pict_type] / (double)rcc->frame_count[pict_type],
328
        a->qcompress,
329
/*        rcc->last_qscale_for[FF_I_TYPE],
330
        rcc->last_qscale_for[FF_P_TYPE],
331
        rcc->last_qscale_for[FF_B_TYPE],
332
        rcc->next_non_b_qscale,*/
333
        rcc->i_cplx_sum[FF_I_TYPE] / (double)rcc->frame_count[FF_I_TYPE],
334
        rcc->i_cplx_sum[FF_P_TYPE] / (double)rcc->frame_count[FF_P_TYPE],
335
        rcc->p_cplx_sum[FF_P_TYPE] / (double)rcc->frame_count[FF_P_TYPE],
336
        rcc->p_cplx_sum[FF_B_TYPE] / (double)rcc->frame_count[FF_B_TYPE],
337
        (rcc->i_cplx_sum[pict_type] + rcc->p_cplx_sum[pict_type]) / (double)rcc->frame_count[pict_type],
338
        0
339
    };
340

    
341
    bits = av_expr_eval(rcc->rc_eq_eval, const_values, rce);
342
    if (isnan(bits)) {
343
        av_log(s->avctx, AV_LOG_ERROR, "Error evaluating rc_eq \"%s\"\n", s->avctx->rc_eq);
344
        return -1;
345
    }
346

    
347
    rcc->pass1_rc_eq_output_sum+= bits;
348
    bits*=rate_factor;
349
    if(bits<0.0) bits=0.0;
350
    bits+= 1.0; //avoid 1/0 issues
351

    
352
    /* user override */
353
    for(i=0; i<s->avctx->rc_override_count; i++){
354
        RcOverride *rco= s->avctx->rc_override;
355
        if(rco[i].start_frame > frame_num) continue;
356
        if(rco[i].end_frame   < frame_num) continue;
357

    
358
        if(rco[i].qscale)
359
            bits= qp2bits(rce, rco[i].qscale); //FIXME move at end to really force it?
360
        else
361
            bits*= rco[i].quality_factor;
362
    }
363

    
364
    q= bits2qp(rce, bits);
365

    
366
    /* I/B difference */
367
    if     (pict_type==FF_I_TYPE && s->avctx->i_quant_factor<0.0)
368
        q= -q*s->avctx->i_quant_factor + s->avctx->i_quant_offset;
369
    else if(pict_type==FF_B_TYPE && s->avctx->b_quant_factor<0.0)
370
        q= -q*s->avctx->b_quant_factor + s->avctx->b_quant_offset;
371
    if(q<1) q=1;
372

    
373
    return q;
374
}
375

    
376
static double get_diff_limited_q(MpegEncContext *s, RateControlEntry *rce, double q){
377
    RateControlContext *rcc= &s->rc_context;
378
    AVCodecContext *a= s->avctx;
379
    const int pict_type= rce->new_pict_type;
380
    const double last_p_q    = rcc->last_qscale_for[FF_P_TYPE];
381
    const double last_non_b_q= rcc->last_qscale_for[rcc->last_non_b_pict_type];
382

    
383
    if     (pict_type==FF_I_TYPE && (a->i_quant_factor>0.0 || rcc->last_non_b_pict_type==FF_P_TYPE))
384
        q= last_p_q    *FFABS(a->i_quant_factor) + a->i_quant_offset;
385
    else if(pict_type==FF_B_TYPE && a->b_quant_factor>0.0)
386
        q= last_non_b_q*    a->b_quant_factor  + a->b_quant_offset;
387
    if(q<1) q=1;
388

    
389
    /* last qscale / qdiff stuff */
390
    if(rcc->last_non_b_pict_type==pict_type || pict_type!=FF_I_TYPE){
391
        double last_q= rcc->last_qscale_for[pict_type];
392
        const int maxdiff= FF_QP2LAMBDA * a->max_qdiff;
393

    
394
        if     (q > last_q + maxdiff) q= last_q + maxdiff;
395
        else if(q < last_q - maxdiff) q= last_q - maxdiff;
396
    }
397

    
398
    rcc->last_qscale_for[pict_type]= q; //Note we cannot do that after blurring
399

    
400
    if(pict_type!=FF_B_TYPE)
401
        rcc->last_non_b_pict_type= pict_type;
402

    
403
    return q;
404
}
405

    
406
/**
407
 * gets the qmin & qmax for pict_type
408
 */
409
static void get_qminmax(int *qmin_ret, int *qmax_ret, MpegEncContext *s, int pict_type){
410
    int qmin= s->avctx->lmin;
411
    int qmax= s->avctx->lmax;
412

    
413
    assert(qmin <= qmax);
414

    
415
    if(pict_type==FF_B_TYPE){
416
        qmin= (int)(qmin*FFABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5);
417
        qmax= (int)(qmax*FFABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5);
418
    }else if(pict_type==FF_I_TYPE){
419
        qmin= (int)(qmin*FFABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5);
420
        qmax= (int)(qmax*FFABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5);
421
    }
422

    
423
    qmin= av_clip(qmin, 1, FF_LAMBDA_MAX);
424
    qmax= av_clip(qmax, 1, FF_LAMBDA_MAX);
425

    
426
    if(qmax<qmin) qmax= qmin;
427

    
428
    *qmin_ret= qmin;
429
    *qmax_ret= qmax;
430
}
431

    
432
static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q, int frame_num){
433
    RateControlContext *rcc= &s->rc_context;
434
    int qmin, qmax;
435
    const int pict_type= rce->new_pict_type;
436
    const double buffer_size= s->avctx->rc_buffer_size;
437
    const double fps= 1/av_q2d(s->avctx->time_base);
438
    const double min_rate= s->avctx->rc_min_rate / fps;
439
    const double max_rate= s->avctx->rc_max_rate / fps;
440

    
441
    get_qminmax(&qmin, &qmax, s, pict_type);
442

    
443
    /* modulation */
444
    if(s->avctx->rc_qmod_freq && frame_num%s->avctx->rc_qmod_freq==0 && pict_type==FF_P_TYPE)
445
        q*= s->avctx->rc_qmod_amp;
446

    
447
//printf("q:%f\n", q);
448
    /* buffer overflow/underflow protection */
449
    if(buffer_size){
450
        double expected_size= rcc->buffer_index;
451
        double q_limit;
452

    
453
        if(min_rate){
454
            double d= 2*(buffer_size - expected_size)/buffer_size;
455
            if(d>1.0) d=1.0;
456
            else if(d<0.0001) d=0.0001;
457
            q*= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
458

    
459
            q_limit= bits2qp(rce, FFMAX((min_rate - buffer_size + rcc->buffer_index) * s->avctx->rc_min_vbv_overflow_use, 1));
460
            if(q > q_limit){
461
                if(s->avctx->debug&FF_DEBUG_RC){
462
                    av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
463
                }
464
                q= q_limit;
465
            }
466
        }
467

    
468
        if(max_rate){
469
            double d= 2*expected_size/buffer_size;
470
            if(d>1.0) d=1.0;
471
            else if(d<0.0001) d=0.0001;
472
            q/= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
473

    
474
            q_limit= bits2qp(rce, FFMAX(rcc->buffer_index * s->avctx->rc_max_available_vbv_use, 1));
475
            if(q < q_limit){
476
                if(s->avctx->debug&FF_DEBUG_RC){
477
                    av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
478
                }
479
                q= q_limit;
480
            }
481
        }
482
    }
483
//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);
484
    if(s->avctx->rc_qsquish==0.0 || qmin==qmax){
485
        if     (q<qmin) q=qmin;
486
        else if(q>qmax) q=qmax;
487
    }else{
488
        double min2= log(qmin);
489
        double max2= log(qmax);
490

    
491
        q= log(q);
492
        q= (q - min2)/(max2-min2) - 0.5;
493
        q*= -4.0;
494
        q= 1.0/(1.0 + exp(q));
495
        q= q*(max2-min2) + min2;
496

    
497
        q= exp(q);
498
    }
499

    
500
    return q;
501
}
502

    
503
//----------------------------------
504
// 1 Pass Code
505

    
506
static double predict_size(Predictor *p, double q, double var)
507
{
508
     return p->coeff*var / (q*p->count);
509
}
510

    
511
/*
512
static double predict_qp(Predictor *p, double size, double var)
513
{
514
//printf("coeff:%f, count:%f, var:%f, size:%f//\n", p->coeff, p->count, var, size);
515
     return p->coeff*var / (size*p->count);
516
}
517
*/
518

    
519
static void update_predictor(Predictor *p, double q, double var, double size)
520
{
521
    double new_coeff= size*q / (var + 1);
522
    if(var<10) return;
523

    
524
    p->count*= p->decay;
525
    p->coeff*= p->decay;
526
    p->count++;
527
    p->coeff+= new_coeff;
528
}
529

    
530
static void adaptive_quantization(MpegEncContext *s, double q){
531
    int i;
532
    const float lumi_masking= s->avctx->lumi_masking / (128.0*128.0);
533
    const float dark_masking= s->avctx->dark_masking / (128.0*128.0);
534
    const float temp_cplx_masking= s->avctx->temporal_cplx_masking;
535
    const float spatial_cplx_masking = s->avctx->spatial_cplx_masking;
536
    const float p_masking = s->avctx->p_masking;
537
    const float border_masking = s->avctx->border_masking;
538
    float bits_sum= 0.0;
539
    float cplx_sum= 0.0;
540
    float cplx_tab[s->mb_num];
541
    float bits_tab[s->mb_num];
542
    const int qmin= s->avctx->mb_lmin;
543
    const int qmax= s->avctx->mb_lmax;
544
    Picture * const pic= &s->current_picture;
545
    const int mb_width = s->mb_width;
546
    const int mb_height = s->mb_height;
547

    
548
    for(i=0; i<s->mb_num; i++){
549
        const int mb_xy= s->mb_index2xy[i];
550
        float temp_cplx= sqrt(pic->mc_mb_var[mb_xy]); //FIXME merge in pow()
551
        float spat_cplx= sqrt(pic->mb_var[mb_xy]);
552
        const int lumi= pic->mb_mean[mb_xy];
553
        float bits, cplx, factor;
554
        int mb_x = mb_xy % s->mb_stride;
555
        int mb_y = mb_xy / s->mb_stride;
556
        int mb_distance;
557
        float mb_factor = 0.0;
558
#if 0
559
        if(spat_cplx < q/3) spat_cplx= q/3; //FIXME finetune
560
        if(temp_cplx < q/3) temp_cplx= q/3; //FIXME finetune
561
#endif
562
        if(spat_cplx < 4) spat_cplx= 4; //FIXME finetune
563
        if(temp_cplx < 4) temp_cplx= 4; //FIXME finetune
564

    
565
        if((s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_INTRA)){//FIXME hq mode
566
            cplx= spat_cplx;
567
            factor= 1.0 + p_masking;
568
        }else{
569
            cplx= temp_cplx;
570
            factor= pow(temp_cplx, - temp_cplx_masking);
571
        }
572
        factor*=pow(spat_cplx, - spatial_cplx_masking);
573

    
574
        if(lumi>127)
575
            factor*= (1.0 - (lumi-128)*(lumi-128)*lumi_masking);
576
        else
577
            factor*= (1.0 - (lumi-128)*(lumi-128)*dark_masking);
578

    
579
        if(mb_x < mb_width/5){
580
            mb_distance = mb_width/5 - mb_x;
581
            mb_factor = (float)mb_distance / (float)(mb_width/5);
582
        }else if(mb_x > 4*mb_width/5){
583
            mb_distance = mb_x - 4*mb_width/5;
584
            mb_factor = (float)mb_distance / (float)(mb_width/5);
585
        }
586
        if(mb_y < mb_height/5){
587
            mb_distance = mb_height/5 - mb_y;
588
            mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5));
589
        }else if(mb_y > 4*mb_height/5){
590
            mb_distance = mb_y - 4*mb_height/5;
591
            mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5));
592
        }
593

    
594
        factor*= 1.0 - border_masking*mb_factor;
595

    
596
        if(factor<0.00001) factor= 0.00001;
597

    
598
        bits= cplx*factor;
599
        cplx_sum+= cplx;
600
        bits_sum+= bits;
601
        cplx_tab[i]= cplx;
602
        bits_tab[i]= bits;
603
    }
604

    
605
    /* handle qmin/qmax clipping */
606
    if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
607
        float factor= bits_sum/cplx_sum;
608
        for(i=0; i<s->mb_num; i++){
609
            float newq= q*cplx_tab[i]/bits_tab[i];
610
            newq*= factor;
611

    
612
            if     (newq > qmax){
613
                bits_sum -= bits_tab[i];
614
                cplx_sum -= cplx_tab[i]*q/qmax;
615
            }
616
            else if(newq < qmin){
617
                bits_sum -= bits_tab[i];
618
                cplx_sum -= cplx_tab[i]*q/qmin;
619
            }
620
        }
621
        if(bits_sum < 0.001) bits_sum= 0.001;
622
        if(cplx_sum < 0.001) cplx_sum= 0.001;
623
    }
624

    
625
    for(i=0; i<s->mb_num; i++){
626
        const int mb_xy= s->mb_index2xy[i];
627
        float newq= q*cplx_tab[i]/bits_tab[i];
628
        int intq;
629

    
630
        if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
631
            newq*= bits_sum/cplx_sum;
632
        }
633

    
634
        intq= (int)(newq + 0.5);
635

    
636
        if     (intq > qmax) intq= qmax;
637
        else if(intq < qmin) intq= qmin;
638
//if(i%s->mb_width==0) printf("\n");
639
//printf("%2d%3d ", intq, ff_sqrt(s->mc_mb_var[i]));
640
        s->lambda_table[mb_xy]= intq;
641
    }
642
}
643

    
644
void ff_get_2pass_fcode(MpegEncContext *s){
645
    RateControlContext *rcc= &s->rc_context;
646
    int picture_number= s->picture_number;
647
    RateControlEntry *rce;
648

    
649
    rce= &rcc->entry[picture_number];
650
    s->f_code= rce->f_code;
651
    s->b_code= rce->b_code;
652
}
653

    
654
//FIXME rd or at least approx for dquant
655

    
656
float ff_rate_estimate_qscale(MpegEncContext *s, int dry_run)
657
{
658
    float q;
659
    int qmin, qmax;
660
    float br_compensation;
661
    double diff;
662
    double short_term_q;
663
    double fps;
664
    int picture_number= s->picture_number;
665
    int64_t wanted_bits;
666
    RateControlContext *rcc= &s->rc_context;
667
    AVCodecContext *a= s->avctx;
668
    RateControlEntry local_rce, *rce;
669
    double bits;
670
    double rate_factor;
671
    int var;
672
    const int pict_type= s->pict_type;
673
    Picture * const pic= &s->current_picture;
674
    emms_c();
675

    
676
#if CONFIG_LIBXVID
677
    if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID)
678
        return ff_xvid_rate_estimate_qscale(s, dry_run);
679
#endif
680

    
681
    get_qminmax(&qmin, &qmax, s, pict_type);
682

    
683
    fps= 1/av_q2d(s->avctx->time_base);
684
//printf("input_pic_num:%d pic_num:%d frame_rate:%d\n", s->input_picture_number, s->picture_number, s->frame_rate);
685
        /* update predictors */
686
    if(picture_number>2 && !dry_run){
687
        const int last_var= s->last_pict_type == FF_I_TYPE ? rcc->last_mb_var_sum : rcc->last_mc_mb_var_sum;
688
        update_predictor(&rcc->pred[s->last_pict_type], rcc->last_qscale, sqrt(last_var), s->frame_bits);
689
    }
690

    
691
    if(s->flags&CODEC_FLAG_PASS2){
692
        assert(picture_number>=0);
693
        assert(picture_number<rcc->num_entries);
694
        rce= &rcc->entry[picture_number];
695
        wanted_bits= rce->expected_bits;
696
    }else{
697
        Picture *dts_pic;
698
        rce= &local_rce;
699

    
700
        //FIXME add a dts field to AVFrame and ensure its set and use it here instead of reordering
701
        //but the reordering is simpler for now until h.264 b pyramid must be handeld
702
        if(s->pict_type == FF_B_TYPE || s->low_delay)
703
            dts_pic= s->current_picture_ptr;
704
        else
705
            dts_pic= s->last_picture_ptr;
706

    
707
//if(dts_pic)
708
//            av_log(NULL, AV_LOG_ERROR, "%Ld %Ld %Ld %d\n", s->current_picture_ptr->pts, s->user_specified_pts, dts_pic->pts, picture_number);
709

    
710
        if(!dts_pic || dts_pic->pts == AV_NOPTS_VALUE)
711
            wanted_bits= (uint64_t)(s->bit_rate*(double)picture_number/fps);
712
        else
713
            wanted_bits= (uint64_t)(s->bit_rate*(double)dts_pic->pts/fps);
714
    }
715

    
716
    diff= s->total_bits - wanted_bits;
717
    br_compensation= (a->bit_rate_tolerance - diff)/a->bit_rate_tolerance;
718
    if(br_compensation<=0.0) br_compensation=0.001;
719

    
720
    var= pict_type == FF_I_TYPE ? pic->mb_var_sum : pic->mc_mb_var_sum;
721

    
722
    short_term_q = 0; /* avoid warning */
723
    if(s->flags&CODEC_FLAG_PASS2){
724
        if(pict_type!=FF_I_TYPE)
725
            assert(pict_type == rce->new_pict_type);
726

    
727
        q= rce->new_qscale / br_compensation;
728
//printf("%f %f %f last:%d var:%d type:%d//\n", q, rce->new_qscale, br_compensation, s->frame_bits, var, pict_type);
729
    }else{
730
        rce->pict_type=
731
        rce->new_pict_type= pict_type;
732
        rce->mc_mb_var_sum= pic->mc_mb_var_sum;
733
        rce->mb_var_sum   = pic->   mb_var_sum;
734
        rce->qscale   = FF_QP2LAMBDA * 2;
735
        rce->f_code   = s->f_code;
736
        rce->b_code   = s->b_code;
737
        rce->misc_bits= 1;
738

    
739
        bits= predict_size(&rcc->pred[pict_type], rce->qscale, sqrt(var));
740
        if(pict_type== FF_I_TYPE){
741
            rce->i_count   = s->mb_num;
742
            rce->i_tex_bits= bits;
743
            rce->p_tex_bits= 0;
744
            rce->mv_bits= 0;
745
        }else{
746
            rce->i_count   = 0; //FIXME we do know this approx
747
            rce->i_tex_bits= 0;
748
            rce->p_tex_bits= bits*0.9;
749

    
750
            rce->mv_bits= bits*0.1;
751
        }
752
        rcc->i_cplx_sum [pict_type] += rce->i_tex_bits*rce->qscale;
753
        rcc->p_cplx_sum [pict_type] += rce->p_tex_bits*rce->qscale;
754
        rcc->mv_bits_sum[pict_type] += rce->mv_bits;
755
        rcc->frame_count[pict_type] ++;
756

    
757
        bits= rce->i_tex_bits + rce->p_tex_bits;
758
        rate_factor= rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum * br_compensation;
759

    
760
        q= get_qscale(s, rce, rate_factor, picture_number);
761
        if (q < 0)
762
            return -1;
763

    
764
        assert(q>0.0);
765
//printf("%f ", q);
766
        q= get_diff_limited_q(s, rce, q);
767
//printf("%f ", q);
768
        assert(q>0.0);
769

    
770
        if(pict_type==FF_P_TYPE || s->intra_only){ //FIXME type dependent blur like in 2-pass
771
            rcc->short_term_qsum*=a->qblur;
772
            rcc->short_term_qcount*=a->qblur;
773

    
774
            rcc->short_term_qsum+= q;
775
            rcc->short_term_qcount++;
776
//printf("%f ", q);
777
            q= short_term_q= rcc->short_term_qsum/rcc->short_term_qcount;
778
//printf("%f ", q);
779
        }
780
        assert(q>0.0);
781

    
782
        q= modify_qscale(s, rce, q, picture_number);
783

    
784
        rcc->pass1_wanted_bits+= s->bit_rate/fps;
785

    
786
        assert(q>0.0);
787
    }
788

    
789
    if(s->avctx->debug&FF_DEBUG_RC){
790
        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",
791
        av_get_pict_type_char(pict_type), qmin, q, qmax, picture_number, (int)wanted_bits/1000, (int)s->total_bits/1000,
792
        br_compensation, short_term_q, s->frame_bits, pic->mb_var_sum, pic->mc_mb_var_sum, s->bit_rate/1000, (int)fps
793
        );
794
    }
795

    
796
    if     (q<qmin) q=qmin;
797
    else if(q>qmax) q=qmax;
798

    
799
    if(s->adaptive_quant)
800
        adaptive_quantization(s, q);
801
    else
802
        q= (int)(q + 0.5);
803

    
804
    if(!dry_run){
805
        rcc->last_qscale= q;
806
        rcc->last_mc_mb_var_sum= pic->mc_mb_var_sum;
807
        rcc->last_mb_var_sum= pic->mb_var_sum;
808
    }
809
#if 0
810
{
811
    static int mvsum=0, texsum=0;
812
    mvsum += s->mv_bits;
813
    texsum += s->i_tex_bits + s->p_tex_bits;
814
    printf("%d %d//\n\n", mvsum, texsum);
815
}
816
#endif
817
    return q;
818
}
819

    
820
//----------------------------------------------
821
// 2-Pass code
822

    
823
static int init_pass2(MpegEncContext *s)
824
{
825
    RateControlContext *rcc= &s->rc_context;
826
    AVCodecContext *a= s->avctx;
827
    int i, toobig;
828
    double fps= 1/av_q2d(s->avctx->time_base);
829
    double complexity[5]={0,0,0,0,0};   // aproximate bits at quant=1
830
    uint64_t const_bits[5]={0,0,0,0,0}; // quantizer independent bits
831
    uint64_t all_const_bits;
832
    uint64_t all_available_bits= (uint64_t)(s->bit_rate*(double)rcc->num_entries/fps);
833
    double rate_factor=0;
834
    double step;
835
    //int last_i_frame=-10000000;
836
    const int filter_size= (int)(a->qblur*4) | 1;
837
    double expected_bits;
838
    double *qscale, *blurred_qscale, qscale_sum;
839

    
840
    /* find complexity & const_bits & decide the pict_types */
841
    for(i=0; i<rcc->num_entries; i++){
842
        RateControlEntry *rce= &rcc->entry[i];
843

    
844
        rce->new_pict_type= rce->pict_type;
845
        rcc->i_cplx_sum [rce->pict_type] += rce->i_tex_bits*rce->qscale;
846
        rcc->p_cplx_sum [rce->pict_type] += rce->p_tex_bits*rce->qscale;
847
        rcc->mv_bits_sum[rce->pict_type] += rce->mv_bits;
848
        rcc->frame_count[rce->pict_type] ++;
849

    
850
        complexity[rce->new_pict_type]+= (rce->i_tex_bits+ rce->p_tex_bits)*(double)rce->qscale;
851
        const_bits[rce->new_pict_type]+= rce->mv_bits + rce->misc_bits;
852
    }
853
    all_const_bits= const_bits[FF_I_TYPE] + const_bits[FF_P_TYPE] + const_bits[FF_B_TYPE];
854

    
855
    if(all_available_bits < all_const_bits){
856
        av_log(s->avctx, AV_LOG_ERROR, "requested bitrate is too low\n");
857
        return -1;
858
    }
859

    
860
    qscale= av_malloc(sizeof(double)*rcc->num_entries);
861
    blurred_qscale= av_malloc(sizeof(double)*rcc->num_entries);
862
    toobig = 0;
863

    
864
    for(step=256*256; step>0.0000001; step*=0.5){
865
        expected_bits=0;
866
        rate_factor+= step;
867

    
868
        rcc->buffer_index= s->avctx->rc_buffer_size/2;
869

    
870
        /* find qscale */
871
        for(i=0; i<rcc->num_entries; i++){
872
            qscale[i]= get_qscale(s, &rcc->entry[i], rate_factor, i);
873
        }
874
        assert(filter_size%2==1);
875

    
876
        /* fixed I/B QP relative to P mode */
877
        for(i=rcc->num_entries-1; i>=0; i--){
878
            RateControlEntry *rce= &rcc->entry[i];
879

    
880
            qscale[i]= get_diff_limited_q(s, rce, qscale[i]);
881
        }
882

    
883
        /* smooth curve */
884
        for(i=0; i<rcc->num_entries; i++){
885
            RateControlEntry *rce= &rcc->entry[i];
886
            const int pict_type= rce->new_pict_type;
887
            int j;
888
            double q=0.0, sum=0.0;
889

    
890
            for(j=0; j<filter_size; j++){
891
                int index= i+j-filter_size/2;
892
                double d= index-i;
893
                double coeff= a->qblur==0 ? 1.0 : exp(-d*d/(a->qblur * a->qblur));
894

    
895
                if(index < 0 || index >= rcc->num_entries) continue;
896
                if(pict_type != rcc->entry[index].new_pict_type) continue;
897
                q+= qscale[index] * coeff;
898
                sum+= coeff;
899
            }
900
            blurred_qscale[i]= q/sum;
901
        }
902

    
903
        /* find expected bits */
904
        for(i=0; i<rcc->num_entries; i++){
905
            RateControlEntry *rce= &rcc->entry[i];
906
            double bits;
907
            rce->new_qscale= modify_qscale(s, rce, blurred_qscale[i], i);
908
            bits= qp2bits(rce, rce->new_qscale) + rce->mv_bits + rce->misc_bits;
909
//printf("%d %f\n", rce->new_bits, blurred_qscale[i]);
910
            bits += 8*ff_vbv_update(s, bits);
911

    
912
            rce->expected_bits= expected_bits;
913
            expected_bits += bits;
914
        }
915

    
916
        /*
917
        av_log(s->avctx, AV_LOG_INFO,
918
            "expected_bits: %f all_available_bits: %d rate_factor: %f\n",
919
            expected_bits, (int)all_available_bits, rate_factor);
920
        */
921
        if(expected_bits > all_available_bits) {
922
            rate_factor-= step;
923
            ++toobig;
924
        }
925
    }
926
    av_free(qscale);
927
    av_free(blurred_qscale);
928

    
929
    /* check bitrate calculations and print info */
930
    qscale_sum = 0.0;
931
    for(i=0; i<rcc->num_entries; i++){
932
        /* av_log(s->avctx, AV_LOG_DEBUG, "[lavc rc] entry[%d].new_qscale = %.3f  qp = %.3f\n",
933
            i, rcc->entry[i].new_qscale, rcc->entry[i].new_qscale / FF_QP2LAMBDA); */
934
        qscale_sum += av_clip(rcc->entry[i].new_qscale / FF_QP2LAMBDA, s->avctx->qmin, s->avctx->qmax);
935
    }
936
    assert(toobig <= 40);
937
    av_log(s->avctx, AV_LOG_DEBUG,
938
        "[lavc rc] requested bitrate: %d bps  expected bitrate: %d bps\n",
939
        s->bit_rate,
940
        (int)(expected_bits / ((double)all_available_bits/s->bit_rate)));
941
    av_log(s->avctx, AV_LOG_DEBUG,
942
        "[lavc rc] estimated target average qp: %.3f\n",
943
        (float)qscale_sum / rcc->num_entries);
944
    if (toobig == 0) {
945
        av_log(s->avctx, AV_LOG_INFO,
946
            "[lavc rc] Using all of requested bitrate is not "
947
            "necessary for this video with these parameters.\n");
948
    } else if (toobig == 40) {
949
        av_log(s->avctx, AV_LOG_ERROR,
950
            "[lavc rc] Error: bitrate too low for this video "
951
            "with these parameters.\n");
952
        return -1;
953
    } else if (fabs(expected_bits/all_available_bits - 1.0) > 0.01) {
954
        av_log(s->avctx, AV_LOG_ERROR,
955
            "[lavc rc] Error: 2pass curve failed to converge\n");
956
        return -1;
957
    }
958

    
959
    return 0;
960
}