double a0, a1, a2;
double b0, b1, b2;
- double i1, i2;
- double o1, o2;
+ double w1, w2;
} CrossfeedContext;
static int query_formats(AVFilterContext *ctx)
const double b0 = s->b0;
const double b1 = s->b1;
const double b2 = s->b2;
- const double a1 = s->a1;
- const double a2 = s->a2;
+ const double a1 = -s->a1;
+ const double a2 = -s->a2;
AVFrame *out;
double *dst;
int n;
for (n = 0; n < out->nb_samples; n++, src += 2, dst += 2) {
double mid = (src[0] + src[1]) * level_in * .5;
double side = (src[0] - src[1]) * level_in * .5;
- double oside = side * b0 + s->i1 * b1 + s->i2 * b2 - s->o1 * a1 - s->o2 * a2;
+ double oside = side * b0 + s->w1;
- s->i2 = s->i1;
- s->i1 = side;
- s->o2 = s->o1;
- s->o1 = oside;
+ s->w1 = b1 * side + s->w2 + a1 * oside;
+ s->w2 = b2 * side + a2 * oside;
if (ctx->is_disabled) {
dst[0] = src[0];