ref: dae16fb94bddb413295951da539119c2edb28d4e
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> #include "analysis.h" #include "mlp.h" extern const MLP net; #ifndef M_PI #define M_PI 3.141592653 #endif static const float dct_table[128] = { 0.250000, 0.250000, 0.250000, 0.250000, 0.250000, 0.250000, 0.250000, 0.250000, 0.250000, 0.250000, 0.250000, 0.250000, 0.250000, 0.250000, 0.250000, 0.250000, 0.351851, 0.338330, 0.311806, 0.273300, 0.224292, 0.166664, 0.102631, 0.034654, -0.034654, -0.102631, -0.166664, -0.224292, -0.273300, -0.311806, -0.338330, -0.351851, 0.346760, 0.293969, 0.196424, 0.068975, -0.068975, -0.196424, -0.293969, -0.346760, -0.346760, -0.293969, -0.196424, -0.068975, 0.068975, 0.196424, 0.293969, 0.346760, 0.338330, 0.224292, 0.034654, -0.166664, -0.311806, -0.351851, -0.273300, -0.102631, 0.102631, 0.273300, 0.351851, 0.311806, 0.166664, -0.034654, -0.224292, -0.338330, 0.326641, 0.135299, -0.135299, -0.326641, -0.326641, -0.135299, 0.135299, 0.326641, 0.326641, 0.135299, -0.135299, -0.326641, -0.326641, -0.135299, 0.135299, 0.326641, 0.311806, 0.034654, -0.273300, -0.338330, -0.102631, 0.224292, 0.351851, 0.166664, -0.166664, -0.351851, -0.224292, 0.102631, 0.338330, 0.273300, -0.034654, -0.311806, 0.293969, -0.068975, -0.346760, -0.196424, 0.196424, 0.346760, 0.068975, -0.293969, -0.293969, 0.068975, 0.346760, 0.196424, -0.196424, -0.346760, -0.068975, 0.293969, 0.273300, -0.166664, -0.338330, 0.034654, 0.351851, 0.102631, -0.311806, -0.224292, 0.224292, 0.311806, -0.102631, -0.351851, -0.034654, 0.338330, 0.166664, -0.273300, }; static const float analysis_window[240] = { 0.000043f, 0.000171f, 0.000385f, 0.000685f, 0.001071f, 0.001541f, 0.002098f, 0.002739f, 0.003466f, 0.004278f, 0.005174f, 0.006156f, 0.007222f, 0.008373f, 0.009607f, 0.010926f, 0.012329f, 0.013815f, 0.015385f, 0.017037f, 0.018772f, 0.020590f, 0.022490f, 0.024472f, 0.026535f, 0.028679f, 0.030904f, 0.033210f, 0.035595f, 0.038060f, 0.040604f, 0.043227f, 0.045928f, 0.048707f, 0.051564f, 0.054497f, 0.057506f, 0.060591f, 0.063752f, 0.066987f, 0.070297f, 0.073680f, 0.077136f, 0.080665f, 0.084265f, 0.087937f, 0.091679f, 0.095492f, 0.099373f, 0.103323f, 0.107342f, 0.111427f, 0.115579f, 0.119797f, 0.124080f, 0.128428f, 0.132839f, 0.137313f, 0.141849f, 0.146447f, 0.151105f, 0.155823f, 0.160600f, 0.165435f, 0.170327f, 0.175276f, 0.180280f, 0.185340f, 0.190453f, 0.195619f, 0.200838f, 0.206107f, 0.211427f, 0.216797f, 0.222215f, 0.227680f, 0.233193f, 0.238751f, 0.244353f, 0.250000f, 0.255689f, 0.261421f, 0.267193f, 0.273005f, 0.278856f, 0.284744f, 0.290670f, 0.296632f, 0.302628f, 0.308658f, 0.314721f, 0.320816f, 0.326941f, 0.333097f, 0.339280f, 0.345492f, 0.351729f, 0.357992f, 0.364280f, 0.370590f, 0.376923f, 0.383277f, 0.389651f, 0.396044f, 0.402455f, 0.408882f, 0.415325f, 0.421783f, 0.428254f, 0.434737f, 0.441231f, 0.447736f, 0.454249f, 0.460770f, 0.467298f, 0.473832f, 0.480370f, 0.486912f, 0.493455f, 0.500000f, 0.506545f, 0.513088f, 0.519630f, 0.526168f, 0.532702f, 0.539230f, 0.545751f, 0.552264f, 0.558769f, 0.565263f, 0.571746f, 0.578217f, 0.584675f, 0.591118f, 0.597545f, 0.603956f, 0.610349f, 0.616723f, 0.623077f, 0.629410f, 0.635720f, 0.642008f, 0.648271f, 0.654508f, 0.660720f, 0.666903f, 0.673059f, 0.679184f, 0.685279f, 0.691342f, 0.697372f, 0.703368f, 0.709330f, 0.715256f, 0.721144f, 0.726995f, 0.732807f, 0.738579f, 0.744311f, 0.750000f, 0.755647f, 0.761249f, 0.766807f, 0.772320f, 0.777785f, 0.783203f, 0.788573f, 0.793893f, 0.799162f, 0.804381f, 0.809547f, 0.814660f, 0.819720f, 0.824724f, 0.829673f, 0.834565f, 0.839400f, 0.844177f, 0.848895f, 0.853553f, 0.858151f, 0.862687f, 0.867161f, 0.871572f, 0.875920f, 0.880203f, 0.884421f, 0.888573f, 0.892658f, 0.896677f, 0.900627f, 0.904508f, 0.908321f, 0.912063f, 0.915735f, 0.919335f, 0.922864f, 0.926320f, 0.929703f, 0.933013f, 0.936248f, 0.939409f, 0.942494f, 0.945503f, 0.948436f, 0.951293f, 0.954072f, 0.956773f, 0.959396f, 0.961940f, 0.964405f, 0.966790f, 0.969096f, 0.971321f, 0.973465f, 0.975528f, 0.977510f, 0.979410f, 0.981228f, 0.982963f, 0.984615f, 0.986185f, 0.987671f, 0.989074f, 0.990393f, 0.991627f, 0.992778f, 0.993844f, 0.994826f, 0.995722f, 0.996534f, 0.997261f, 0.997902f, 0.998459f, 0.998929f, 0.999315f, 0.999615f, 0.999829f, 0.999957f, 1.000000f, }; static const int tbands[NB_TBANDS+1] = { 2, 4, 6, 8, 10, 12, 14, 16, 20, 24, 28, 32, 40, 48, 56, 68, 80, 96, 120 }; /*static const float tweight[NB_TBANDS+1] = { .3, .4, .5, .6, .7, .8, .9, 1., 1., 1., 1., 1., 1., 1., .8, .7, .6, .5 };*/ #define NB_TONAL_SKIP_BANDS 9 #define cA 0.43157974f #define cB 0.67848403f #define cC 0.08595542f #define cE (M_PI/2) static inline float fast_atan2f(float y, float x) { float x2, y2; /* Should avoid underflow on the values we'll get */ if (ABS16(x)+ABS16(y)<1e-9) { x*=1e12; y*=1e12; } x2 = x*x; y2 = y*y; if(x2<y2){ float den = (y2 + cB*x2) * (y2 + cC*x2); if (den!=0) return -x*y*(y2 + cA*x2) / den + (y<0 ? -cE : cE); else return (y<0 ? -cE : cE); }else{ float den = (x2 + cB*y2) * (x2 + cC*y2); if (den!=0) return x*y*(x2 + cA*y2) / den + (y<0 ? -cE : cE) - (x*y<0 ? -cE : cE); else return (y<0 ? -cE : cE) - (x*y<0 ? -cE : cE); } } void tonality_analysis(TonalityAnalysisState *tonal, AnalysisInfo *info, CELTEncoder *celt_enc, const opus_val16 *x, int C) { int i, b; const CELTMode *mode; const kiss_fft_state *kfft; kiss_fft_cpx in[480], out[480]; int N = 480, N2=240; float * OPUS_RESTRICT A = tonal->angle; float * OPUS_RESTRICT dA = tonal->d_angle; float * OPUS_RESTRICT d2A = tonal->d2_angle; float tonality[240]; float noisiness[240]; float band_tonality[NB_TBANDS]; float logE[NB_TBANDS]; float BFCC[8]; float features[100]; float frame_tonality; float max_frame_tonality; float tw_sum=0; float frame_noisiness; const float pi4 = M_PI*M_PI*M_PI*M_PI; float slope=0; float frame_stationarity; float relativeE; float frame_prob; float alpha, alphaE, alphaE2; float frame_loudness; float bandwidth_mask; int bandwidth=0; float bandE[NB_TBANDS]; celt_encoder_ctl(celt_enc, CELT_GET_MODE(&mode)); tonal->last_transition++; alpha = 1.f/IMIN(20, 1+tonal->count); alphaE = 1.f/IMIN(50, 1+tonal->count); alphaE2 = 1.f/IMIN(6000, 1+tonal->count); if (tonal->count<4) tonal->music_prob = .5; kfft = mode->mdct.kfft[0]; if (C==1) { for (i=0;i<N2;i++) { float w = analysis_window[i]; 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 = analysis_window[i]; 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; angle = (.5/M_PI)*fast_atan2f(X1i, X1r); d_angle = angle - A[i]; d2_angle = d_angle - dA[i]; angle2 = (.5/M_PI)*fast_atan2f(X2i, X2r); d_angle2 = angle2 - angle; d2_angle2 = d_angle2 - d_angle; mod1 = d2_angle - floor(.5+d2_angle); noisiness[i] = fabs(mod1); mod1 *= mod1; mod1 *= mod1; mod2 = d2_angle2 - floor(.5+d2_angle2); noisiness[i] += fabs(mod2); 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; max_frame_tonality = 0; tw_sum = 0; info->activity = 0; frame_noisiness = 0; frame_stationarity = 0; if (!tonal->count) { for (b=0;b<NB_TBANDS;b++) { tonal->lowE[b] = 1e10; tonal->highE[b] = -1e10; } } relativeE = 0; frame_loudness = 0; bandwidth_mask = 0; for (b=0;b<NB_TBANDS;b++) { float E=0, tE=0, nE=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]; nE += binE*2*(.5-noisiness[i]); } bandE[b] = E; tonal->E[tonal->E_count][b] = E; frame_noisiness += nE/(1e-15+E); frame_loudness += sqrt(E+1e-10); /* Add a reasonable noise floor */ tonal->meanE[b] = (1-alphaE2)*tonal->meanE[b] + alphaE2*E; tonal->meanRE[b] = (1-alphaE2)*tonal->meanRE[b] + alphaE2*sqrt(E); /* 13 dB slope for spreading function */ bandwidth_mask = MAX32(.05*bandwidth_mask, E); /* Checks if band looks like stationary noise or if it's below a (trivial) masking curve */ if (tonal->meanRE[b]*tonal->meanRE[b] < tonal->meanE[b]*.95 && E>.1*bandwidth_mask) bandwidth = b; logE[b] = log(E+1e-10); tonal->lowE[b] = MIN32(logE[b], tonal->lowE[b]+.01); tonal->highE[b] = MAX32(logE[b], tonal->highE[b]-.1); if (tonal->highE[b] < tonal->lowE[b]+1) { tonal->highE[b]+=.5; tonal->lowE[b]-=.5; } relativeE += (logE[b]-tonal->lowE[b])/(EPSILON+tonal->highE[b]-tonal->lowE[b]); 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; frame_stationarity += stationarity; /*band_tonality[b] = tE/(1e-15+E)*/; band_tonality[b] = MAX16(tE/(EPSILON+E), stationarity*tonal->prev_band_tonality[b]); #if 0 if (b>=NB_TONAL_SKIP_BANDS) { frame_tonality += tweight[b]*band_tonality[b]; tw_sum += tweight[b]; } #else frame_tonality += band_tonality[b]; if (b>=NB_TBANDS-NB_TONAL_SKIP_BANDS) frame_tonality -= band_tonality[b-NB_TBANDS+NB_TONAL_SKIP_BANDS]; #endif max_frame_tonality = MAX16(max_frame_tonality, (1+.03*(b-NB_TBANDS))*frame_tonality); slope += band_tonality[b]*(b-8); /*printf("%f %f ", band_tonality[b], stationarity);*/ tonal->prev_band_tonality[b] = band_tonality[b]; } frame_loudness = 20*log10(frame_loudness); tonal->Etracker = MAX32(tonal->Etracker-.03, frame_loudness); tonal->lowECount *= (1-alphaE); if (frame_loudness < tonal->Etracker-30) tonal->lowECount += alphaE; for (i=0;i<8;i++) { float sum=0; for (b=0;b<16;b++) sum += dct_table[i*16+b]*logE[b]; BFCC[i] = sum; } frame_stationarity /= NB_TBANDS; relativeE /= NB_TBANDS; if (tonal->count<10) relativeE = .5; frame_noisiness /= NB_TBANDS; #if 1 info->activity = frame_noisiness + (1-frame_noisiness)*relativeE; #else info->activity = .5*(1+frame_noisiness-frame_stationarity); #endif frame_tonality = (max_frame_tonality/(NB_TBANDS-NB_TONAL_SKIP_BANDS)); frame_tonality = MAX16(frame_tonality, tonal->prev_tonality*.8); tonal->prev_tonality = frame_tonality; slope /= 8*8; info->tonality_slope = slope; tonal->E_count = (tonal->E_count+1)%NB_FRAMES; tonal->count++; info->tonality = frame_tonality; for (i=0;i<4;i++) features[i] = -0.12299*(BFCC[i]+tonal->mem[i+24]) + 0.49195*(tonal->mem[i]+tonal->mem[i+16]) + 0.69693*tonal->mem[i+8] - 1.4349*tonal->cmean[i]; for (i=0;i<4;i++) tonal->cmean[i] = (1-alpha)*tonal->cmean[i] + alpha*BFCC[i]; for (i=0;i<4;i++) features[4+i] = 0.63246*(BFCC[i]-tonal->mem[i+24]) + 0.31623*(tonal->mem[i]-tonal->mem[i+16]); for (i=0;i<3;i++) features[8+i] = 0.53452*(BFCC[i]+tonal->mem[i+24]) - 0.26726*(tonal->mem[i]+tonal->mem[i+16]) -0.53452*tonal->mem[i+8]; if (tonal->count > 5) { for (i=0;i<9;i++) tonal->std[i] = (1-alpha)*tonal->std[i] + alpha*features[i]*features[i]; } for (i=0;i<8;i++) { tonal->mem[i+24] = tonal->mem[i+16]; tonal->mem[i+16] = tonal->mem[i+8]; tonal->mem[i+8] = tonal->mem[i]; tonal->mem[i] = BFCC[i]; } for (i=0;i<9;i++) features[11+i] = sqrt(tonal->std[i]); features[20] = info->tonality; features[21] = info->activity; features[22] = frame_stationarity; features[23] = info->tonality_slope; features[24] = tonal->lowECount; #ifndef FIXED_POINT mlp_process(&net, features, &frame_prob); frame_prob = .5*(frame_prob+1); /* Curve fitting between the MLP probability and the actual probability */ frame_prob = .01 + 1.21*frame_prob*frame_prob - .23*pow(frame_prob, 10); /*printf("%f\n", frame_prob);*/ { float tau, beta; float p0, p1; float max_certainty; /* One transition every 3 minutes */ tau = .00005; beta = .1; max_certainty = .01+1.f/(20+.5*tonal->last_transition); p0 = (1-tonal->music_prob)*(1-tau) + tonal->music_prob *tau; p1 = tonal->music_prob *(1-tau) + (1-tonal->music_prob)*tau; p0 *= pow(1-frame_prob, beta); p1 *= pow(frame_prob, beta); tonal->music_prob = MAX16(max_certainty, MIN16(1-max_certainty, p1/(p0+p1))); info->music_prob = tonal->music_prob; /*printf("%f %f\n", frame_prob, info->music_prob);*/ } if (tonal->last_music != (tonal->music_prob>.5)) tonal->last_transition=0; tonal->last_music = tonal->music_prob>.5; #else info->music_prob = 0; #endif /*for (i=0;i<25;i++) printf("%f ", features[i]); printf("\n");*/ /* FIXME: Can't detect SWB for now because the last band ends at 12 kHz */ if (bandwidth == NB_TBANDS-1 || tonal->count<100) { tonal->opus_bandwidth = OPUS_BANDWIDTH_FULLBAND; } else { int close_enough = 0; if (bandE[bandwidth-1] < 3000*bandE[NB_TBANDS-1] && bandwidth < NB_TBANDS-1) close_enough=1; if (bandwidth<=11 || (bandwidth==12 && close_enough)) tonal->opus_bandwidth = OPUS_BANDWIDTH_NARROWBAND; else if (bandwidth<=13) tonal->opus_bandwidth = OPUS_BANDWIDTH_MEDIUMBAND; else if (bandwidth<=15 || (bandwidth==16 && close_enough)) tonal->opus_bandwidth = OPUS_BANDWIDTH_WIDEBAND; } info->noisiness = frame_noisiness; info->valid = 1; }