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avfilter/af_crossfeed: use transposed II form

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This commit is contained in:
Paul B Mahol 2020-10-20 13:32:25 +02:00
parent fe2be5d9ce
commit 6d59d69bb0
1 changed files with 6 additions and 9 deletions
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15
libavfilter/af_crossfeed.c
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@ -35,8 +35,7 @@ typedef struct CrossfeedContext {
double a0, a1, a2;
double b0, b1, b2;
double i1, i2;
double o1, o2;
double w1, w2;
} CrossfeedContext;
static int query_formats(AVFilterContext *ctx)
@ -92,8 +91,8 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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;
@ -113,12 +112,10 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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];