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/third_party/ffmpeg/libavcodec/
Diirfilter.c123 double cos_w0, sin_w0; in biquad_init_coeffs() local
137 cos_w0 = cos(M_PI * cutoff_ratio); in biquad_init_coeffs()
143 c->gain = ((1.0 + cos_w0) / 2.0) / a0; in biquad_init_coeffs()
144 x0 = ((1.0 + cos_w0) / 2.0) / a0; in biquad_init_coeffs()
145 x1 = (-(1.0 + cos_w0)) / a0; in biquad_init_coeffs()
147 c->gain = ((1.0 - cos_w0) / 2.0) / a0; in biquad_init_coeffs()
148 x0 = ((1.0 - cos_w0) / 2.0) / a0; in biquad_init_coeffs()
149 x1 = (1.0 - cos_w0) / a0; in biquad_init_coeffs()
152 c->cy[1] = (2.0 * cos_w0) / a0; in biquad_init_coeffs()