[FFmpeg-cvslog] avfilter/af_crossfeed: use transposed II form
Paul B Mahol
git at videolan.org
Tue Oct 20 14:52:26 EEST 2020
ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Tue Oct 20 13:32:25 2020 +0200| [6d59d69bb05f52e7833266bd41dee13a5d285b0e] | committer: Paul B Mahol
avfilter/af_crossfeed: use transposed II form
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6d59d69bb05f52e7833266bd41dee13a5d285b0e
---
libavfilter/af_crossfeed.c | 15 ++++++---------
1 file changed, 6 insertions(+), 9 deletions(-)
diff --git a/libavfilter/af_crossfeed.c b/libavfilter/af_crossfeed.c
index 70dd26eb28..fb0a49ec87 100644
--- a/libavfilter/af_crossfeed.c
+++ b/libavfilter/af_crossfeed.c
@@ -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];
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