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ffmpeg / libavcodec / ratecontrol.c @ edd259f9

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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,
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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
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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
25
 * 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"
33
#include "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;
70
    const char *error = NULL;
71
    static const char * const const_names[]={
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        "PI",
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        "E",
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        "iTex",
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        "pTex",
76
        "tex",
77
        "mv",
78
        "fCode",
79
        "iCount",
80
        "mcVar",
81
        "var",
82
        "isI",
83
        "isP",
84
        "isB",
85
        "avgQP",
86
        "qComp",
87
/*        "lastIQP",
88
        "lastPQP",
89
        "lastBQP",
90
        "nextNonBQP",*/
91
        "avgIITex",
92
        "avgPITex",
93
        "avgPPTex",
94
        "avgBPTex",
95
        "avgTex",
96
        NULL
97
    };
98
    static double (* const func1[])(void *, double)={
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        (void *)bits2qp,
100
        (void *)qp2bits,
101
        NULL
102
    };
103
    static const char * const func1_names[]={
104
        "bits2qp",
105
        "qp2bits",
106
        NULL
107
    };
108
    emms_c();
109

    
110
    rcc->rc_eq_eval = ff_parse_expr(s->avctx->rc_eq ? s->avctx->rc_eq : "tex^qComp", const_names, func1_names, func1, NULL, NULL, &error);
111
    if (!rcc->rc_eq_eval) {
112
        av_log(s->avctx, AV_LOG_ERROR, "Error parsing rc_eq \"%s\": %s\n", s->avctx->rc_eq, error? error : "");
113
        return -1;
114
    }
115

    
116
    for(i=0; i<5; i++){
117
        rcc->pred[i].coeff= FF_QP2LAMBDA * 7.0;
118
        rcc->pred[i].count= 1.0;
119

    
120
        rcc->pred[i].decay= 0.4;
121
        rcc->i_cplx_sum [i]=
122
        rcc->p_cplx_sum [i]=
123
        rcc->mv_bits_sum[i]=
124
        rcc->qscale_sum [i]=
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        rcc->frame_count[i]= 1; // 1 is better because of 1/0 and such
126
        rcc->last_qscale_for[i]=FF_QP2LAMBDA * 5;
127
    }
128
    rcc->buffer_index= s->avctx->rc_initial_buffer_occupancy;
129

    
130
    if(s->flags&CODEC_FLAG_PASS2){
131
        int i;
132
        char *p;
133

    
134
        /* find number of pics */
135
        p= s->avctx->stats_in;
136
        for(i=-1; p; i++){
137
            p= strchr(p+1, ';');
138
        }
139
        i+= s->max_b_frames;
140
        if(i<=0 || i>=INT_MAX / sizeof(RateControlEntry))
141
            return -1;
142
        rcc->entry = av_mallocz(i*sizeof(RateControlEntry));
143
        rcc->num_entries= i;
144

    
145
        /* init all to skipped p frames (with b frames we might have a not encoded frame at the end FIXME) */
146
        for(i=0; i<rcc->num_entries; i++){
147
            RateControlEntry *rce= &rcc->entry[i];
148
            rce->pict_type= rce->new_pict_type=FF_P_TYPE;
149
            rce->qscale= rce->new_qscale=FF_QP2LAMBDA * 2;
150
            rce->misc_bits= s->mb_num + 10;
151
            rce->mb_var_sum= s->mb_num*100;
152
        }
153

    
154
        /* read stats */
155
        p= s->avctx->stats_in;
156
        for(i=0; i<rcc->num_entries - s->max_b_frames; i++){
157
            RateControlEntry *rce;
158
            int picture_number;
159
            int e;
160
            char *next;
161

    
162
            next= strchr(p, ';');
163
            if(next){
164
                (*next)=0; //sscanf in unbelievably slow on looong strings //FIXME copy / do not write
165
                next++;
166
            }
167
            e= sscanf(p, " in:%d ", &picture_number);
168

    
169
            assert(picture_number >= 0);
170
            assert(picture_number < rcc->num_entries);
171
            rce= &rcc->entry[picture_number];
172

    
173
            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",
174
                   &rce->pict_type, &rce->qscale, &rce->i_tex_bits, &rce->p_tex_bits, &rce->mv_bits, &rce->misc_bits,
175
                   &rce->f_code, &rce->b_code, &rce->mc_mb_var_sum, &rce->mb_var_sum, &rce->i_count, &rce->skip_count, &rce->header_bits);
176
            if(e!=14){
177
                av_log(s->avctx, AV_LOG_ERROR, "statistics are damaged at line %d, parser out=%d\n", i, e);
178
                return -1;
179
            }
180

    
181
            p= next;
182
        }
183

    
184
        if(init_pass2(s) < 0) return -1;
185

    
186
        //FIXME maybe move to end
187
        if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID) {
188
#if CONFIG_LIBXVID
189
            return ff_xvid_rate_control_init(s);
190
#else
191
            av_log(s->avctx, AV_LOG_ERROR, "Xvid ratecontrol requires libavcodec compiled with Xvid support.\n");
192
            return -1;
193
#endif
194
        }
195
    }
196

    
197
    if(!(s->flags&CODEC_FLAG_PASS2)){
198

    
199
        rcc->short_term_qsum=0.001;
200
        rcc->short_term_qcount=0.001;
201

    
202
        rcc->pass1_rc_eq_output_sum= 0.001;
203
        rcc->pass1_wanted_bits=0.001;
204

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

    
215
                if     (i%((s->gop_size+3)/4)==0) rce.pict_type= FF_I_TYPE;
216
                else if(i%(s->max_b_frames+1))    rce.pict_type= FF_B_TYPE;
217
                else                              rce.pict_type= FF_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== FF_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
                get_qscale(s, &rce, rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum, i);
244
                rcc->pass1_wanted_bits+= s->bit_rate/(1/av_q2d(s->avctx->time_base)); //FIXME misbehaves a little for variable fps
245
            }
246
        }
247

    
248
    }
249

    
250
    return 0;
251
}
252

    
253
void ff_rate_control_uninit(MpegEncContext *s)
254
{
255
    RateControlContext *rcc= &s->rc_context;
256
    emms_c();
257

    
258
    ff_free_expr(rcc->rc_eq_eval);
259
    av_freep(&rcc->entry);
260

    
261
#if CONFIG_LIBXVID
262
    if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID)
263
        ff_xvid_rate_control_uninit(s);
264
#endif
265
}
266

    
267
int ff_vbv_update(MpegEncContext *s, int frame_size){
268
    RateControlContext *rcc= &s->rc_context;
269
    const double fps= 1/av_q2d(s->avctx->time_base);
270
    const int buffer_size= s->avctx->rc_buffer_size;
271
    const double min_rate= s->avctx->rc_min_rate/fps;
272
    const double max_rate= s->avctx->rc_max_rate/fps;
273

    
274
//printf("%d %f %d %f %f\n", buffer_size, rcc->buffer_index, frame_size, min_rate, max_rate);
275
    if(buffer_size){
276
        int left;
277

    
278
        rcc->buffer_index-= frame_size;
279
        if(rcc->buffer_index < 0){
280
            av_log(s->avctx, AV_LOG_ERROR, "rc buffer underflow\n");
281
            rcc->buffer_index= 0;
282
        }
283

    
284
        left= buffer_size - rcc->buffer_index - 1;
285
        rcc->buffer_index += av_clip(left, min_rate, max_rate);
286

    
287
        if(rcc->buffer_index > buffer_size){
288
            int stuffing= ceil((rcc->buffer_index - buffer_size)/8);
289

    
290
            if(stuffing < 4 && s->codec_id == CODEC_ID_MPEG4)
291
                stuffing=4;
292
            rcc->buffer_index -= 8*stuffing;
293

    
294
            if(s->avctx->debug & FF_DEBUG_RC)
295
                av_log(s->avctx, AV_LOG_DEBUG, "stuffing %d bytes\n", stuffing);
296

    
297
            return stuffing;
298
        }
299
    }
300
    return 0;
301
}
302

    
303
/**
304
 * modifies the bitrate curve from pass1 for one frame
305
 */
306
static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num){
307
    RateControlContext *rcc= &s->rc_context;
308
    AVCodecContext *a= s->avctx;
309
    double q, bits;
310
    const int pict_type= rce->new_pict_type;
311
    const double mb_num= s->mb_num;
312
    int i;
313

    
314
    double const_values[]={
315
        M_PI,
316
        M_E,
317
        rce->i_tex_bits*rce->qscale,
318
        rce->p_tex_bits*rce->qscale,
319
        (rce->i_tex_bits + rce->p_tex_bits)*(double)rce->qscale,
320
        rce->mv_bits/mb_num,
321
        rce->pict_type == FF_B_TYPE ? (rce->f_code + rce->b_code)*0.5 : rce->f_code,
322
        rce->i_count/mb_num,
323
        rce->mc_mb_var_sum/mb_num,
324
        rce->mb_var_sum/mb_num,
325
        rce->pict_type == FF_I_TYPE,
326
        rce->pict_type == FF_P_TYPE,
327
        rce->pict_type == FF_B_TYPE,
328
        rcc->qscale_sum[pict_type] / (double)rcc->frame_count[pict_type],
329
        a->qcompress,
330
/*        rcc->last_qscale_for[FF_I_TYPE],
331
        rcc->last_qscale_for[FF_P_TYPE],
332
        rcc->last_qscale_for[FF_B_TYPE],
333
        rcc->next_non_b_qscale,*/
334
        rcc->i_cplx_sum[FF_I_TYPE] / (double)rcc->frame_count[FF_I_TYPE],
335
        rcc->i_cplx_sum[FF_P_TYPE] / (double)rcc->frame_count[FF_P_TYPE],
336
        rcc->p_cplx_sum[FF_P_TYPE] / (double)rcc->frame_count[FF_P_TYPE],
337
        rcc->p_cplx_sum[FF_B_TYPE] / (double)rcc->frame_count[FF_B_TYPE],
338
        (rcc->i_cplx_sum[pict_type] + rcc->p_cplx_sum[pict_type]) / (double)rcc->frame_count[pict_type],
339
        0
340
    };
341

    
342
    bits= ff_eval_expr(rcc->rc_eq_eval, const_values, rce);
343
    if (isnan(bits)) {
344
        av_log(s->avctx, AV_LOG_ERROR, "Error evaluating rc_eq \"%s\"\n", s->avctx->rc_eq);
345
        return -1;
346
    }
347

    
348
    rcc->pass1_rc_eq_output_sum+= bits;
349
    bits*=rate_factor;
350
    if(bits<0.0) bits=0.0;
351
    bits+= 1.0; //avoid 1/0 issues
352

    
353
    /* user override */
354
    for(i=0; i<s->avctx->rc_override_count; i++){
355
        RcOverride *rco= s->avctx->rc_override;
356
        if(rco[i].start_frame > frame_num) continue;
357
        if(rco[i].end_frame   < frame_num) continue;
358

    
359
        if(rco[i].qscale)
360
            bits= qp2bits(rce, rco[i].qscale); //FIXME move at end to really force it?
361
        else
362
            bits*= rco[i].quality_factor;
363
    }
364

    
365
    q= bits2qp(rce, bits);
366

    
367
    /* I/B difference */
368
    if     (pict_type==FF_I_TYPE && s->avctx->i_quant_factor<0.0)
369
        q= -q*s->avctx->i_quant_factor + s->avctx->i_quant_offset;
370
    else if(pict_type==FF_B_TYPE && s->avctx->b_quant_factor<0.0)
371
        q= -q*s->avctx->b_quant_factor + s->avctx->b_quant_offset;
372
    if(q<1) q=1;
373

    
374
    return q;
375
}
376

    
377
static double get_diff_limited_q(MpegEncContext *s, RateControlEntry *rce, double q){
378
    RateControlContext *rcc= &s->rc_context;
379
    AVCodecContext *a= s->avctx;
380
    const int pict_type= rce->new_pict_type;
381
    const double last_p_q    = rcc->last_qscale_for[FF_P_TYPE];
382
    const double last_non_b_q= rcc->last_qscale_for[rcc->last_non_b_pict_type];
383

    
384
    if     (pict_type==FF_I_TYPE && (a->i_quant_factor>0.0 || rcc->last_non_b_pict_type==FF_P_TYPE))
385
        q= last_p_q    *FFABS(a->i_quant_factor) + a->i_quant_offset;
386
    else if(pict_type==FF_B_TYPE && a->b_quant_factor>0.0)
387
        q= last_non_b_q*    a->b_quant_factor  + a->b_quant_offset;
388
    if(q<1) q=1;
389

    
390
    /* last qscale / qdiff stuff */
391
    if(rcc->last_non_b_pict_type==pict_type || pict_type!=FF_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!=FF_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==FF_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==FF_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
    const int pict_type= rce->new_pict_type;
437
    const double buffer_size= s->avctx->rc_buffer_size;
438
    const double fps= 1/av_q2d(s->avctx->time_base);
439
    const double min_rate= s->avctx->rc_min_rate / fps;
440
    const double max_rate= s->avctx->rc_max_rate / fps;
441

    
442
    get_qminmax(&qmin, &qmax, s, pict_type);
443

    
444
    /* modulation */
445
    if(s->avctx->rc_qmod_freq && frame_num%s->avctx->rc_qmod_freq==0 && pict_type==FF_P_TYPE)
446
        q*= s->avctx->rc_qmod_amp;
447

    
448
//printf("q:%f\n", q);
449
    /* buffer overflow/underflow protection */
450
    if(buffer_size){
451
        double expected_size= rcc->buffer_index;
452
        double q_limit;
453

    
454
        if(min_rate){
455
            double d= 2*(buffer_size - expected_size)/buffer_size;
456
            if(d>1.0) d=1.0;
457
            else if(d<0.0001) d=0.0001;
458
            q*= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
459

    
460
            q_limit= bits2qp(rce, FFMAX((min_rate - buffer_size + rcc->buffer_index) * s->avctx->rc_min_vbv_overflow_use, 1));
461
            if(q > q_limit){
462
                if(s->avctx->debug&FF_DEBUG_RC){
463
                    av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
464
                }
465
                q= q_limit;
466
            }
467
        }
468

    
469
        if(max_rate){
470
            double d= 2*expected_size/buffer_size;
471
            if(d>1.0) d=1.0;
472
            else if(d<0.0001) d=0.0001;
473
            q/= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
474

    
475
            q_limit= bits2qp(rce, FFMAX(rcc->buffer_index * s->avctx->rc_max_available_vbv_use, 1));
476
            if(q < q_limit){
477
                if(s->avctx->debug&FF_DEBUG_RC){
478
                    av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
479
                }
480
                q= q_limit;
481
            }
482
        }
483
    }
484
//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);
485
    if(s->avctx->rc_qsquish==0.0 || qmin==qmax){
486
        if     (q<qmin) q=qmin;
487
        else if(q>qmax) q=qmax;
488
    }else{
489
        double min2= log(qmin);
490
        double max2= log(qmax);
491

    
492
        q= log(q);
493
        q= (q - min2)/(max2-min2) - 0.5;
494
        q*= -4.0;
495
        q= 1.0/(1.0 + exp(q));
496
        q= q*(max2-min2) + min2;
497

    
498
        q= exp(q);
499
    }
500

    
501
    return q;
502
}
503

    
504
//----------------------------------
505
// 1 Pass Code
506

    
507
static double predict_size(Predictor *p, double q, double var)
508
{
509
     return p->coeff*var / (q*p->count);
510
}
511

    
512
/*
513
static double predict_qp(Predictor *p, double size, double var)
514
{
515
//printf("coeff:%f, count:%f, var:%f, size:%f//\n", p->coeff, p->count, var, size);
516
     return p->coeff*var / (size*p->count);
517
}
518
*/
519

    
520
static void update_predictor(Predictor *p, double q, double var, double size)
521
{
522
    double new_coeff= size*q / (var + 1);
523
    if(var<10) return;
524

    
525
    p->count*= p->decay;
526
    p->coeff*= p->decay;
527
    p->count++;
528
    p->coeff+= new_coeff;
529
}
530

    
531
static void adaptive_quantization(MpegEncContext *s, double q){
532
    int i;
533
    const float lumi_masking= s->avctx->lumi_masking / (128.0*128.0);
534
    const float dark_masking= s->avctx->dark_masking / (128.0*128.0);
535
    const float temp_cplx_masking= s->avctx->temporal_cplx_masking;
536
    const float spatial_cplx_masking = s->avctx->spatial_cplx_masking;
537
    const float p_masking = s->avctx->p_masking;
538
    const float border_masking = s->avctx->border_masking;
539
    float bits_sum= 0.0;
540
    float cplx_sum= 0.0;
541
    float cplx_tab[s->mb_num];
542
    float bits_tab[s->mb_num];
543
    const int qmin= s->avctx->mb_lmin;
544
    const int qmax= s->avctx->mb_lmax;
545
    Picture * const pic= &s->current_picture;
546
    const int mb_width = s->mb_width;
547
    const int mb_height = s->mb_height;
548

    
549
    for(i=0; i<s->mb_num; i++){
550
        const int mb_xy= s->mb_index2xy[i];
551
        float temp_cplx= sqrt(pic->mc_mb_var[mb_xy]); //FIXME merge in pow()
552
        float spat_cplx= sqrt(pic->mb_var[mb_xy]);
553
        const int lumi= pic->mb_mean[mb_xy];
554
        float bits, cplx, factor;
555
        int mb_x = mb_xy % s->mb_stride;
556
        int mb_y = mb_xy / s->mb_stride;
557
        int mb_distance;
558
        float mb_factor = 0.0;
559
#if 0
560
        if(spat_cplx < q/3) spat_cplx= q/3; //FIXME finetune
561
        if(temp_cplx < q/3) temp_cplx= q/3; //FIXME finetune
562
#endif
563
        if(spat_cplx < 4) spat_cplx= 4; //FIXME finetune
564
        if(temp_cplx < 4) temp_cplx= 4; //FIXME finetune
565

    
566
        if((s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_INTRA)){//FIXME hq mode
567
            cplx= spat_cplx;
568
            factor= 1.0 + p_masking;
569
        }else{
570
            cplx= temp_cplx;
571
            factor= pow(temp_cplx, - temp_cplx_masking);
572
        }
573
        factor*=pow(spat_cplx, - spatial_cplx_masking);
574

    
575
        if(lumi>127)
576
            factor*= (1.0 - (lumi-128)*(lumi-128)*lumi_masking);
577
        else
578
            factor*= (1.0 - (lumi-128)*(lumi-128)*dark_masking);
579

    
580
        if(mb_x < mb_width/5){
581
            mb_distance = mb_width/5 - mb_x;
582
            mb_factor = (float)mb_distance / (float)(mb_width/5);
583
        }else if(mb_x > 4*mb_width/5){
584
            mb_distance = mb_x - 4*mb_width/5;
585
            mb_factor = (float)mb_distance / (float)(mb_width/5);
586
        }
587
        if(mb_y < mb_height/5){
588
            mb_distance = mb_height/5 - mb_y;
589
            mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5));
590
        }else if(mb_y > 4*mb_height/5){
591
            mb_distance = mb_y - 4*mb_height/5;
592
            mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5));
593
        }
594

    
595
        factor*= 1.0 - border_masking*mb_factor;
596

    
597
        if(factor<0.00001) factor= 0.00001;
598

    
599
        bits= cplx*factor;
600
        cplx_sum+= cplx;
601
        bits_sum+= bits;
602
        cplx_tab[i]= cplx;
603
        bits_tab[i]= bits;
604
    }
605

    
606
    /* handle qmin/qmax clipping */
607
    if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
608
        float factor= bits_sum/cplx_sum;
609
        for(i=0; i<s->mb_num; i++){
610
            float newq= q*cplx_tab[i]/bits_tab[i];
611
            newq*= factor;
612

    
613
            if     (newq > qmax){
614
                bits_sum -= bits_tab[i];
615
                cplx_sum -= cplx_tab[i]*q/qmax;
616
            }
617
            else if(newq < qmin){
618
                bits_sum -= bits_tab[i];
619
                cplx_sum -= cplx_tab[i]*q/qmin;
620
            }
621
        }
622
        if(bits_sum < 0.001) bits_sum= 0.001;
623
        if(cplx_sum < 0.001) cplx_sum= 0.001;
624
    }
625

    
626
    for(i=0; i<s->mb_num; i++){
627
        const int mb_xy= s->mb_index2xy[i];
628
        float newq= q*cplx_tab[i]/bits_tab[i];
629
        int intq;
630

    
631
        if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
632
            newq*= bits_sum/cplx_sum;
633
        }
634

    
635
        intq= (int)(newq + 0.5);
636

    
637
        if     (intq > qmax) intq= qmax;
638
        else if(intq < qmin) intq= qmin;
639
//if(i%s->mb_width==0) printf("\n");
640
//printf("%2d%3d ", intq, ff_sqrt(s->mc_mb_var[i]));
641
        s->lambda_table[mb_xy]= intq;
642
    }
643
}
644

    
645
void ff_get_2pass_fcode(MpegEncContext *s){
646
    RateControlContext *rcc= &s->rc_context;
647
    int picture_number= s->picture_number;
648
    RateControlEntry *rce;
649

    
650
    rce= &rcc->entry[picture_number];
651
    s->f_code= rce->f_code;
652
    s->b_code= rce->b_code;
653
}
654

    
655
//FIXME rd or at least approx for dquant
656

    
657
float ff_rate_estimate_qscale(MpegEncContext *s, int dry_run)
658
{
659
    float q;
660
    int qmin, qmax;
661
    float br_compensation;
662
    double diff;
663
    double short_term_q;
664
    double fps;
665
    int picture_number= s->picture_number;
666
    int64_t wanted_bits;
667
    RateControlContext *rcc= &s->rc_context;
668
    AVCodecContext *a= s->avctx;
669
    RateControlEntry local_rce, *rce;
670
    double bits;
671
    double rate_factor;
672
    int var;
673
    const int pict_type= s->pict_type;
674
    Picture * const pic= &s->current_picture;
675
    emms_c();
676

    
677
#if CONFIG_LIBXVID
678
    if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID)
679
        return ff_xvid_rate_estimate_qscale(s, dry_run);
680
#endif
681

    
682
    get_qminmax(&qmin, &qmax, s, pict_type);
683

    
684
    fps= 1/av_q2d(s->avctx->time_base);
685
//printf("input_pic_num:%d pic_num:%d frame_rate:%d\n", s->input_picture_number, s->picture_number, s->frame_rate);
686
        /* update predictors */
687
    if(picture_number>2 && !dry_run){
688
        const int last_var= s->last_pict_type == FF_I_TYPE ? rcc->last_mb_var_sum : rcc->last_mc_mb_var_sum;
689
        update_predictor(&rcc->pred[s->last_pict_type], rcc->last_qscale, sqrt(last_var), s->frame_bits);
690
    }
691

    
692
    if(s->flags&CODEC_FLAG_PASS2){
693
        assert(picture_number>=0);
694
        assert(picture_number<rcc->num_entries);
695
        rce= &rcc->entry[picture_number];
696
        wanted_bits= rce->expected_bits;
697
    }else{
698
        Picture *dts_pic;
699
        rce= &local_rce;
700

    
701
        //FIXME add a dts field to AVFrame and ensure its set and use it here instead of reordering
702
        //but the reordering is simpler for now until h.264 b pyramid must be handeld
703
        if(s->pict_type == FF_B_TYPE || s->low_delay)
704
            dts_pic= s->current_picture_ptr;
705
        else
706
            dts_pic= s->last_picture_ptr;
707

    
708
//if(dts_pic)
709
//            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);
710

    
711
        if(!dts_pic || dts_pic->pts == AV_NOPTS_VALUE)
712
            wanted_bits= (uint64_t)(s->bit_rate*(double)picture_number/fps);
713
        else
714
            wanted_bits= (uint64_t)(s->bit_rate*(double)dts_pic->pts/fps);
715
    }
716

    
717
    diff= s->total_bits - wanted_bits;
718
    br_compensation= (a->bit_rate_tolerance - diff)/a->bit_rate_tolerance;
719
    if(br_compensation<=0.0) br_compensation=0.001;
720

    
721
    var= pict_type == FF_I_TYPE ? pic->mb_var_sum : pic->mc_mb_var_sum;
722

    
723
    short_term_q = 0; /* avoid warning */
724
    if(s->flags&CODEC_FLAG_PASS2){
725
        if(pict_type!=FF_I_TYPE)
726
            assert(pict_type == rce->new_pict_type);
727

    
728
        q= rce->new_qscale / br_compensation;
729
//printf("%f %f %f last:%d var:%d type:%d//\n", q, rce->new_qscale, br_compensation, s->frame_bits, var, pict_type);
730
    }else{
731
        rce->pict_type=
732
        rce->new_pict_type= pict_type;
733
        rce->mc_mb_var_sum= pic->mc_mb_var_sum;
734
        rce->mb_var_sum   = pic->   mb_var_sum;
735
        rce->qscale   = FF_QP2LAMBDA * 2;
736
        rce->f_code   = s->f_code;
737
        rce->b_code   = s->b_code;
738
        rce->misc_bits= 1;
739

    
740
        bits= predict_size(&rcc->pred[pict_type], rce->qscale, sqrt(var));
741
        if(pict_type== FF_I_TYPE){
742
            rce->i_count   = s->mb_num;
743
            rce->i_tex_bits= bits;
744
            rce->p_tex_bits= 0;
745
            rce->mv_bits= 0;
746
        }else{
747
            rce->i_count   = 0; //FIXME we do know this approx
748
            rce->i_tex_bits= 0;
749
            rce->p_tex_bits= bits*0.9;
750

    
751
            rce->mv_bits= bits*0.1;
752
        }
753
        rcc->i_cplx_sum [pict_type] += rce->i_tex_bits*rce->qscale;
754
        rcc->p_cplx_sum [pict_type] += rce->p_tex_bits*rce->qscale;
755
        rcc->mv_bits_sum[pict_type] += rce->mv_bits;
756
        rcc->frame_count[pict_type] ++;
757

    
758
        bits= rce->i_tex_bits + rce->p_tex_bits;
759
        rate_factor= rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum * br_compensation;
760

    
761
        q= get_qscale(s, rce, rate_factor, picture_number);
762
        if (q < 0)
763
            return -1;
764

    
765
        assert(q>0.0);
766
//printf("%f ", q);
767
        q= get_diff_limited_q(s, rce, q);
768
//printf("%f ", q);
769
        assert(q>0.0);
770

    
771
        if(pict_type==FF_P_TYPE || s->intra_only){ //FIXME type dependent blur like in 2-pass
772
            rcc->short_term_qsum*=a->qblur;
773
            rcc->short_term_qcount*=a->qblur;
774

    
775
            rcc->short_term_qsum+= q;
776
            rcc->short_term_qcount++;
777
//printf("%f ", q);
778
            q= short_term_q= rcc->short_term_qsum/rcc->short_term_qcount;
779
//printf("%f ", q);
780
        }
781
        assert(q>0.0);
782

    
783
        q= modify_qscale(s, rce, q, picture_number);
784

    
785
        rcc->pass1_wanted_bits+= s->bit_rate/fps;
786

    
787
        assert(q>0.0);
788
    }
789

    
790
    if(s->avctx->debug&FF_DEBUG_RC){
791
        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",
792
        av_get_pict_type_char(pict_type), qmin, q, qmax, picture_number, (int)wanted_bits/1000, (int)s->total_bits/1000,
793
        br_compensation, short_term_q, s->frame_bits, pic->mb_var_sum, pic->mc_mb_var_sum, s->bit_rate/1000, (int)fps
794
        );
795
    }
796

    
797
    if     (q<qmin) q=qmin;
798
    else if(q>qmax) q=qmax;
799

    
800
    if(s->adaptive_quant)
801
        adaptive_quantization(s, q);
802
    else
803
        q= (int)(q + 0.5);
804

    
805
    if(!dry_run){
806
        rcc->last_qscale= q;
807
        rcc->last_mc_mb_var_sum= pic->mc_mb_var_sum;
808
        rcc->last_mb_var_sum= pic->mb_var_sum;
809
    }
810
#if 0
811
{
812
    static int mvsum=0, texsum=0;
813
    mvsum += s->mv_bits;
814
    texsum += s->i_tex_bits + s->p_tex_bits;
815
    printf("%d %d//\n\n", mvsum, texsum);
816
}
817
#endif
818
    return q;
819
}
820

    
821
//----------------------------------------------
822
// 2-Pass code
823

    
824
static int init_pass2(MpegEncContext *s)
825
{
826
    RateControlContext *rcc= &s->rc_context;
827
    AVCodecContext *a= s->avctx;
828
    int i, toobig;
829
    double fps= 1/av_q2d(s->avctx->time_base);
830
    double complexity[5]={0,0,0,0,0};   // aproximate bits at quant=1
831
    uint64_t const_bits[5]={0,0,0,0,0}; // quantizer independent bits
832
    uint64_t all_const_bits;
833
    uint64_t all_available_bits= (uint64_t)(s->bit_rate*(double)rcc->num_entries/fps);
834
    double rate_factor=0;
835
    double step;
836
    //int last_i_frame=-10000000;
837
    const int filter_size= (int)(a->qblur*4) | 1;
838
    double expected_bits;
839
    double *qscale, *blurred_qscale, qscale_sum;
840

    
841
    /* find complexity & const_bits & decide the pict_types */
842
    for(i=0; i<rcc->num_entries; i++){
843
        RateControlEntry *rce= &rcc->entry[i];
844

    
845
        rce->new_pict_type= rce->pict_type;
846
        rcc->i_cplx_sum [rce->pict_type] += rce->i_tex_bits*rce->qscale;
847
        rcc->p_cplx_sum [rce->pict_type] += rce->p_tex_bits*rce->qscale;
848
        rcc->mv_bits_sum[rce->pict_type] += rce->mv_bits;
849
        rcc->frame_count[rce->pict_type] ++;
850

    
851
        complexity[rce->new_pict_type]+= (rce->i_tex_bits+ rce->p_tex_bits)*(double)rce->qscale;
852
        const_bits[rce->new_pict_type]+= rce->mv_bits + rce->misc_bits;
853
    }
854
    all_const_bits= const_bits[FF_I_TYPE] + const_bits[FF_P_TYPE] + const_bits[FF_B_TYPE];
855

    
856
    if(all_available_bits < all_const_bits){
857
        av_log(s->avctx, AV_LOG_ERROR, "requested bitrate is too low\n");
858
        return -1;
859
    }
860

    
861
    qscale= av_malloc(sizeof(double)*rcc->num_entries);
862
    blurred_qscale= av_malloc(sizeof(double)*rcc->num_entries);
863
    toobig = 0;
864

    
865
    for(step=256*256; step>0.0000001; step*=0.5){
866
        expected_bits=0;
867
        rate_factor+= step;
868

    
869
        rcc->buffer_index= s->avctx->rc_buffer_size/2;
870

    
871
        /* find qscale */
872
        for(i=0; i<rcc->num_entries; i++){
873
            qscale[i]= get_qscale(s, &rcc->entry[i], rate_factor, i);
874
        }
875
        assert(filter_size%2==1);
876

    
877
        /* fixed I/B QP relative to P mode */
878
        for(i=rcc->num_entries-1; i>=0; i--){
879
            RateControlEntry *rce= &rcc->entry[i];
880

    
881
            qscale[i]= get_diff_limited_q(s, rce, qscale[i]);
882
        }
883

    
884
        /* smooth curve */
885
        for(i=0; i<rcc->num_entries; i++){
886
            RateControlEntry *rce= &rcc->entry[i];
887
            const int pict_type= rce->new_pict_type;
888
            int j;
889
            double q=0.0, sum=0.0;
890

    
891
            for(j=0; j<filter_size; j++){
892
                int index= i+j-filter_size/2;
893
                double d= index-i;
894
                double coeff= a->qblur==0 ? 1.0 : exp(-d*d/(a->qblur * a->qblur));
895

    
896
                if(index < 0 || index >= rcc->num_entries) continue;
897
                if(pict_type != rcc->entry[index].new_pict_type) continue;
898
                q+= qscale[index] * coeff;
899
                sum+= coeff;
900
            }
901
            blurred_qscale[i]= q/sum;
902
        }
903

    
904
        /* find expected bits */
905
        for(i=0; i<rcc->num_entries; i++){
906
            RateControlEntry *rce= &rcc->entry[i];
907
            double bits;
908
            rce->new_qscale= modify_qscale(s, rce, blurred_qscale[i], i);
909
            bits= qp2bits(rce, rce->new_qscale) + rce->mv_bits + rce->misc_bits;
910
//printf("%d %f\n", rce->new_bits, blurred_qscale[i]);
911
            bits += 8*ff_vbv_update(s, bits);
912

    
913
            rce->expected_bits= expected_bits;
914
            expected_bits += bits;
915
        }
916

    
917
        /*
918
        av_log(s->avctx, AV_LOG_INFO,
919
            "expected_bits: %f all_available_bits: %d rate_factor: %f\n",
920
            expected_bits, (int)all_available_bits, rate_factor);
921
        */
922
        if(expected_bits > all_available_bits) {
923
            rate_factor-= step;
924
            ++toobig;
925
        }
926
    }
927
    av_free(qscale);
928
    av_free(blurred_qscale);
929

    
930
    /* check bitrate calculations and print info */
931
    qscale_sum = 0.0;
932
    for(i=0; i<rcc->num_entries; i++){
933
        /* av_log(s->avctx, AV_LOG_DEBUG, "[lavc rc] entry[%d].new_qscale = %.3f  qp = %.3f\n",
934
            i, rcc->entry[i].new_qscale, rcc->entry[i].new_qscale / FF_QP2LAMBDA); */
935
        qscale_sum += av_clip(rcc->entry[i].new_qscale / FF_QP2LAMBDA, s->avctx->qmin, s->avctx->qmax);
936
    }
937
    assert(toobig <= 40);
938
    av_log(s->avctx, AV_LOG_DEBUG,
939
        "[lavc rc] requested bitrate: %d bps  expected bitrate: %d bps\n",
940
        s->bit_rate,
941
        (int)(expected_bits / ((double)all_available_bits/s->bit_rate)));
942
    av_log(s->avctx, AV_LOG_DEBUG,
943
        "[lavc rc] estimated target average qp: %.3f\n",
944
        (float)qscale_sum / rcc->num_entries);
945
    if (toobig == 0) {
946
        av_log(s->avctx, AV_LOG_INFO,
947
            "[lavc rc] Using all of requested bitrate is not "
948
            "necessary for this video with these parameters.\n");
949
    } else if (toobig == 40) {
950
        av_log(s->avctx, AV_LOG_ERROR,
951
            "[lavc rc] Error: bitrate too low for this video "
952
            "with these parameters.\n");
953
        return -1;
954
    } else if (fabs(expected_bits/all_available_bits - 1.0) > 0.01) {
955
        av_log(s->avctx, AV_LOG_ERROR,
956
            "[lavc rc] Error: 2pass curve failed to converge\n");
957
        return -1;
958
    }
959

    
960
    return 0;
961
}