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Code Issues Releases Activity

avfilter/af_acrossover: revert 270068b5a

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Actually it did not work well.
This commit is contained in:
Paul B Mahol 2020-03-26 11:45:32 +01:00
parent e34157f6ea
commit ddbd77da90
1 changed files with 26 additions and 1 deletions
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27
libavfilter/af_acrossover.c
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@ -47,6 +47,7 @@ typedef struct BiquadContext {
typedef struct CrossoverChannel {
BiquadContext lp[MAX_BANDS][4];
BiquadContext hp[MAX_BANDS][4];
} CrossoverChannel;
typedef struct AudioCrossoverContext {
@ -148,6 +149,21 @@ static void set_lp(BiquadContext *b, double fc, double q, double sr)
b->b2 = (1. - alpha) * inv;
}
static void set_hp(BiquadContext *b, double fc, double q, double sr)
{
double omega = 2 * M_PI * fc / sr;
double sn = sin(omega);
double cs = cos(omega);
double alpha = sn / (2 * q);
double inv = 1.0 / (1.0 + alpha);
b->a0 = inv * (1. + cs) / 2.;
b->a1 = -2. * b->a0;
b->a2 = b->a0;
b->b1 = -2. * cs * inv;
b->b2 = (1. - alpha) * inv;
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
@ -177,13 +193,18 @@ static int config_input(AVFilterLink *inlink)
for (ch = 0; ch < inlink->channels; ch++) {
for (band = 0; band <= s->nb_splits; band++) {
set_lp(&s->xover[ch].lp[band][0], s->splits[band], q, sample_rate);
set_hp(&s->xover[ch].hp[band][0], s->splits[band], q, sample_rate);
if (s->order > 1) {
set_lp(&s->xover[ch].lp[band][1], s->splits[band], 1.34, sample_rate);
set_hp(&s->xover[ch].hp[band][1], s->splits[band], 1.34, sample_rate);
set_lp(&s->xover[ch].lp[band][2], s->splits[band], q, sample_rate);
set_hp(&s->xover[ch].hp[band][2], s->splits[band], q, sample_rate);
set_lp(&s->xover[ch].lp[band][3], s->splits[band], 1.34, sample_rate);
set_hp(&s->xover[ch].hp[band][3], s->splits[band], 1.34, sample_rate);
} else {
set_lp(&s->xover[ch].lp[band][1], s->splits[band], q, sample_rate);
set_hp(&s->xover[ch].hp[band][1], s->splits[band], q, sample_rate);
}
}
}
@ -253,12 +274,16 @@ static int filter_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jo
double *dst = (double *)frames[band]->extended_data[ch];
lo = sample;
hi = sample;
for (f = 0; band + 1 < ctx->nb_outputs && f < s->filter_count; f++) {
BiquadContext *lp = &xover->lp[band][f];
lo = biquad_process(lp, lo);
}
hi = sample - lo;
for (f = 0; band + 1 < ctx->nb_outputs && f < s->filter_count; f++) {
BiquadContext *hp = &xover->hp[band][f];
hi = biquad_process(hp, hi);
}
dst[i] = lo;