ref: 1a2e7650f9b18519c7a02281507958b9246a9800
dir: /src/analysis.c/
/* Copyright (c) 2011 Xiph.Org Foundation
Written by Jean-Marc Valin */
/*
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "kiss_fft.h"
#include "celt.h"
#include "modes.h"
#include "arch.h"
#include "quant_bands.h"
#include <stdio.h>
#define NB_FRAMES 8
#define NB_TBANDS 17
static const int tbands[NB_TBANDS+1] = {
4, 6, 8, 10, 12, 14, 16, 20, 24, 32, 40, 48, 56, 68, 80, 96, 120, 156
};
typedef struct {
float angle[240];
float d_angle[240];
float d2_angle[240];
float prev_band_tonality[NB_TBANDS];
float prev_tonality;
float E[NB_FRAMES][NB_TBANDS];
int E_count;
} TonalityAnalysisState;
int boost_band[2];
float boost_amount[2];
float tonality_analysis(TonalityAnalysisState *tonal, CELTEncoder *celt_enc, const opus_val16 *x, int C, float *tslope)
{
int i, b;
const CELTMode *mode;
const kiss_fft_state *kfft;
kiss_fft_cpx in[480], out[480];
const opus_val16 *window;
int overlap = 240;
int N = 480, N2=240;
float * restrict A = tonal->angle;
float * restrict dA = tonal->d_angle;
float * restrict d2A = tonal->d2_angle;
float tonality[240];
float band_tonality[NB_TBANDS];
float frame_tonality;
const float pi4 = M_PI*M_PI*M_PI*M_PI;
float slope=0;
float max_tonality=-1;
int max_band=0;
celt_encoder_ctl(celt_enc, CELT_GET_MODE(&mode));
kfft = mode->mdct.kfft[0];
window = mode->window;
if (C==1)
{
for (i=0;i<N2;i++)
{
float w = .5-.5*cos(M_PI*(i+1)/N2);
in[i].r = MULT16_16(w, x[i]);
in[i].i = MULT16_16(w, x[N-N2+i]);
in[N-i-1].r = MULT16_16(w, x[N-i-1]);
in[N-i-1].i = MULT16_16(w, x[2*N-N2-i-1]);
}
} else {
for (i=0;i<N2;i++)
{
float w = .5-.5*cos(M_PI*(i+1)/N2);
in[i].r = MULT16_16(w, x[2*i]+x[2*i+1]);
in[i].i = MULT16_16(w, x[2*(N-N2+i)]+x[2*(N-N2+i)+1]);
in[N-i-1].r = MULT16_16(w, x[2*(N-i-1)]+x[2*(N-i-1)+1]);
in[N-i-1].i = MULT16_16(w, x[2*(2*N-N2-i-1)]+x[2*(2*N-N2-i-1)+1]);
}
}
opus_fft(kfft, in, out);
for (i=1;i<N2;i++)
{
float X1r, X2r, X1i, X2i;
float angle, d_angle, d2_angle;
float angle2, d_angle2, d2_angle2;
float mod1, mod2, avg_mod;
X1r = out[i].r+out[N-i].r;
X1i = out[i].i-out[N-i].i;
X2r = out[i].i+out[N-i].i;
X2i = out[N-i].r-out[i].r;
//printf("%f\n", X1r);
angle = (.5/M_PI)*atan2(X1i, X1r);
d_angle = angle - A[i];
d2_angle = d_angle - dA[i];
angle2 = (.5/M_PI)*atan2(X2i, X2r);
d_angle2 = angle2 - angle;
d2_angle2 = d_angle2 - d_angle;
//printf("%f ", angle2);
//printf("%f ", d2_angle);
mod1 = d2_angle - floor(.5+d2_angle);
//printf("%f ", mod1);
mod1 *= mod1;
mod1 *= mod1;
mod2 = d2_angle2 - floor(.5+d2_angle2);
mod2 *= mod2;
mod2 *= mod2;
avg_mod = .25*(d2A[i]+2*mod1+mod2);
tonality[i] = 1./(1+40*16*pi4*avg_mod)-.015;
A[i] = angle2;
dA[i] = d_angle2;
d2A[i] = mod2;
}
frame_tonality = 0;
for (b=0;b<NB_TBANDS;b++)
{
float E=0, tE=0;
float L1, L2;
float stationarity;
for (i=tbands[b];i<tbands[b+1];i++)
{
float binE = out[i].r*out[i].r + out[N-i].r*out[N-i].r
+ out[i].i*out[i].i + out[N-i].i*out[N-i].i;
E += binE;
tE += binE*tonality[i];
}
tonal->E[tonal->E_count][b] = E;
L1=L2=0;
for (i=0;i<NB_FRAMES;i++)
{
L1 += sqrt(tonal->E[i][b]);
L2 += tonal->E[i][b];
}
stationarity = MIN16(0.99,L1/sqrt(EPSILON+NB_FRAMES*L2));
stationarity *= stationarity;
stationarity *= stationarity;
//fprintf(stderr, "%f %f %f\n", L1, L2, stationarity);
//fprintf(stderr, "%f %f\n", tE, E);
//fprintf(stderr, "%f %f\n", stationarity, );
//band_tonality[b] = tE/(1e-15+E);
band_tonality[b] = MAX16(tE/(1e-15+E), stationarity*tonal->prev_band_tonality[b]);
//if (band_tonality[b]>1)
// printf("%f %f %f\n", L1, L2, stationarity);
//fprintf(stdout, "%f ", band_tonality[b]);
if (b>=7)
frame_tonality += band_tonality[b];
slope += band_tonality[b]*(b-8);
if (band_tonality[b] > boost_amount[1] && b>=7 && b < NB_TBANDS-1)
{
if (band_tonality[b] > boost_amount[0])
{
boost_amount[1] = boost_amount[0];
boost_band[1] = boost_band[0];
boost_amount[0] = band_tonality[b];
boost_band[0] = b;
} else {
boost_amount[1] = band_tonality[b];
boost_band[1] = b;
}
}
tonal->prev_band_tonality[b] = band_tonality[b];
}
frame_tonality /= NB_TBANDS-7;
frame_tonality = MAX16(frame_tonality, tonal->prev_tonality*.8);
//fprintf(stdout, "%f\n", frame_tonality);
tonal->prev_tonality = frame_tonality;
boost_amount[0] -= frame_tonality+.2;
boost_amount[1] -= frame_tonality+.2;
if (band_tonality[boost_band[0]] < band_tonality[boost_band[0]+1]+.15
|| band_tonality[boost_band[0]] < band_tonality[boost_band[0]-1]+.15)
boost_amount[0]=0;
if (band_tonality[boost_band[1]] < band_tonality[boost_band[1]+1]+.15
|| band_tonality[boost_band[1]] < band_tonality[boost_band[1]-1]+.15)
boost_amount[1]=0;
//boost_band = 16;
//boost_amount = .6;
//printf("%d %f %f\n", max_band, max_tonality, frame_tonality);
slope /= 8*8;
*tslope = slope;
//fprintf(stdout, "%f %f\n", frame_tonality, slope);
tonal->E_count = (tonal->E_count+1)%NB_FRAMES;
return frame_tonality;
}