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lavfi/af_anequalizer: remove cabs, cexp dependencies
Replaces by real arithmetic. Tested the validity of these transformations separately. Numerical differences are ~1e-15, and should not matter: it is not even clear which is more precise mathematically. Reviewed-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
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configure
vendored
1
configure
vendored
@ -2839,7 +2839,6 @@ unix_protocol_select="network"
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# filters
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amovie_filter_deps="avcodec avformat"
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anequalizer_filter_deps="cabs cexp"
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aresample_filter_deps="swresample"
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ass_filter_deps="libass"
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asyncts_filter_deps="avresample"
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@ -19,8 +19,6 @@
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <complex.h>
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#include "libavutil/intreadwrite.h"
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#include "libavutil/avstring.h"
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#include "libavutil/opt.h"
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@ -114,13 +112,17 @@ static void draw_curves(AVFilterContext *ctx, AVFilterLink *inlink, AVFrame *out
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av_parse_color(fg, color, -1, ctx);
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for (f = 0; f < s->w; f++) {
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double complex z;
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double complex H = 1;
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double zr, zi, zr2, zi2;
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double Hr, Hi;
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double Hmag = 1;
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double w;
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int v, y, x;
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w = M_PI * (s->fscale ? pow(s->w - 1, f / s->w) : f) / (s->w - 1);
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z = 1. / cexp(I * w);
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zr = cos(w);
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zr2 = zr * zr;
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zi = -sin(w);
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zi2 = zi * zi;
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for (n = 0; n < s->nb_filters; n++) {
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if (s->filters[n].channel != ch ||
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@ -130,12 +132,19 @@ static void draw_curves(AVFilterContext *ctx, AVFilterLink *inlink, AVFrame *out
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for (i = 0; i < FILTER_ORDER / 2; i++) {
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FoSection *S = &s->filters[n].section[i];
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H *= (((((S->b4 * z + S->b3) * z + S->b2) * z + S->b1) * z + S->b0) /
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((((S->a4 * z + S->a3) * z + S->a2) * z + S->a1) * z + S->a0));
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/* H *= (((((S->b4 * z + S->b3) * z + S->b2) * z + S->b1) * z + S->b0) /
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((((S->a4 * z + S->a3) * z + S->a2) * z + S->a1) * z + S->a0)); */
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Hr = S->b4*(1-8*zr2*zi2) + S->b2*(zr2-zi2) + zr*(S->b1+S->b3*(zr2-3*zi2))+ S->b0;
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Hi = zi*(S->b3*(3*zr2-zi2) + S->b1 + 2*zr*(2*S->b4*(zr2-zi2) + S->b2));
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Hmag *= hypot(Hr, Hi);
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Hr = S->a4*(1-8*zr2*zi2) + S->a2*(zr2-zi2) + zr*(S->a1+S->a3*(zr2-3*zi2))+ S->a0;
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Hi = zi*(S->a3*(3*zr2-zi2) + S->a1 + 2*zr*(2*S->a4*(zr2-zi2) + S->a2));
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Hmag /= hypot(Hr, Hi);
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}
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}
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v = av_clip((1. + -20 * log10(cabs(H)) / s->mag) * s->h / 2, 0, s->h - 1);
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v = av_clip((1. + -20 * log10(Hmag) / s->mag) * s->h / 2, 0, s->h - 1);
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x = lrint(f);
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if (prev_v == -1)
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prev_v = v;
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