[FFmpeg-cvslog] avfilter/af_afftfilt: calculate all channels FFT values upfront

[Paul B Mahol]

ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Mon Nov 12 09:27:08 2018 +0100| [a09411a0ee029687d3a80fb17149406513b2d2e5] | committer: Paul B Mahol

avfilter/af_afftfilt: calculate all channels FFT values upfront

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a09411a0ee029687d3a80fb17149406513b2d2e5
---

 libavfilter/af_afftfilt.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/libavfilter/af_afftfilt.c b/libavfilter/af_afftfilt.c
index d5e3b7f500..150f8ed859 100644
--- a/libavfilter/af_afftfilt.c
+++ b/libavfilter/af_afftfilt.c
@@ -289,15 +289,18 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
 
         for (ch = 0; ch < inlink->channels; ch++) {
             FFTComplex *fft_data = s->fft_data[ch];
+
+            av_fft_permute(s->fft, fft_data);
+            av_fft_calc(s->fft, fft_data);
+        }
+
+        for (ch = 0; ch < inlink->channels; ch++) {
+            FFTComplex *fft_data = s->fft_data[ch];
             FFTComplex *fft_temp = s->fft_temp[ch];
             float *buf = (float *)s->buffer->extended_data[ch];
             int x;
-
             values[VAR_CHANNEL] = ch;
 
-            av_fft_permute(s->fft, fft_data);
-            av_fft_calc(s->fft, fft_data);
-
             for (n = 0; n <= window_size / 2; n++) {
                 float fr, fi;