76 void vbr_init(VBRState *vbr)  in vbr_init()  argument
80    vbr->average_energy=0;  in vbr_init()
81    vbr->last_energy=1;  in vbr_init()
82    vbr->accum_sum=0;  in vbr_init()
83    vbr->energy_alpha=.1;  in vbr_init()
84    vbr->soft_pitch=0;  in vbr_init()
85    vbr->last_pitch_coef=0;  in vbr_init()
86    vbr->last_quality=0;  in vbr_init()
88    vbr->noise_accum = .05*pow(MIN_ENERGY, NOISE_POW);  in vbr_init()
89    vbr->noise_accum_count=.05;  in vbr_init()
90    vbr->noise_level=vbr->noise_accum/vbr->noise_accum_count;  in vbr_init()
91    vbr->consec_noise=0;  in vbr_init()
95       vbr->last_log_energy[i] = log(MIN_ENERGY);  in vbr_init()
124 float vbr_analysis(VBRState *vbr, spx_word16_t *sig, int len, int pitch, float pitch_coef)  in vbr_analysis()  argument
144       non_st += sqr(log_energy-vbr->last_log_energy[i]);  in vbr_analysis()
150    vbr->average_energy = (1-vbr->energy_alpha)*vbr->average_energy + vbr->energy_alpha*ener;  in vbr_analysis()
151    vbr->noise_level=vbr->noise_accum/vbr->noise_accum_count;  in vbr_analysis()
153    if (vbr->noise_accum_count<.06 && ener>MIN_ENERGY)  in vbr_analysis()
154       vbr->noise_accum = .05*pow_ener;  in vbr_analysis()
156    if ((voicing<.3 && non_st < .2 && pow_ener < 1.2*vbr->noise_level)  in vbr_analysis()
157        || (voicing<.3 && non_st < .05 && pow_ener < 1.5*vbr->noise_level)  in vbr_analysis()
158        || (voicing<.4 && non_st < .05 && pow_ener < 1.2*vbr->noise_level)  in vbr_analysis()
163       vbr->consec_noise++;  in vbr_analysis()
164       if (pow_ener > 3*vbr->noise_level)  in vbr_analysis()
165          tmp = 3*vbr->noise_level;  in vbr_analysis()
168       if (vbr->consec_noise>=4)  in vbr_analysis()
170          vbr->noise_accum = .95*vbr->noise_accum + .05*tmp;  in vbr_analysis()
171          vbr->noise_accum_count = .95*vbr->noise_accum_count + .05;  in vbr_analysis()
175       vbr->consec_noise=0;  in vbr_analysis()
178    if (pow_ener < vbr->noise_level && ener>MIN_ENERGY)  in vbr_analysis()
180       vbr->noise_accum = .95*vbr->noise_accum + .05*pow_ener;  in vbr_analysis()
181       vbr->noise_accum_count = .95*vbr->noise_accum_count + .05;        in vbr_analysis()
194       short_diff = log((ener+1)/(1+vbr->last_energy));  in vbr_analysis()
195       long_diff = log((ener+1)/(1+vbr->average_energy));  in vbr_analysis()
217    vbr->last_energy = ener;  in vbr_analysis()
218    vbr->soft_pitch = .6*vbr->soft_pitch + .4*pitch_coef;  in vbr_analysis()
219    qual += 2.2*((pitch_coef-.4) + (vbr->soft_pitch-.4));  in vbr_analysis()
221    if (qual < vbr->last_quality)  in vbr_analysis()
222       qual = .5*qual + .5*vbr->last_quality;  in vbr_analysis()
236    if (vbr->consec_noise>=3)  in vbr_analysis()
239    if (vbr->consec_noise)  in vbr_analysis()
240       qual -= 1.0 * (log(3.0 + vbr->consec_noise)-log(3));  in vbr_analysis()
246       if (vbr->consec_noise>2)  in vbr_analysis()
247          qual-=0.5*(log(3.0 + vbr->consec_noise)-log(3));  in vbr_analysis()
248       if (ener<10000&&vbr->consec_noise>2)  in vbr_analysis()
249          qual-=0.5*(log(3.0 + vbr->consec_noise)-log(3));  in vbr_analysis()
259    vbr->last_pitch_coef = pitch_coef;  in vbr_analysis()
260    vbr->last_quality = qual;  in vbr_analysis()
263       vbr->last_log_energy[i] = vbr->last_log_energy[i-1];  in vbr_analysis()
264    vbr->last_log_energy[0] = log_energy;  in vbr_analysis()
271 void vbr_destroy(VBRState *vbr)  in vbr_destroy()  argument