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author | Paul B Mahol <onemda@gmail.com> | 2018-10-05 00:15:26 +0200 |
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committer | Paul B Mahol <onemda@gmail.com> | 2018-10-05 00:15:26 +0200 |
commit | d39fae08866efebbfdf25951fbaff4df9d26e6b3 (patch) | |
tree | 9b7bf7ce69f99938d66a917ec9e76b5ba06e833d /libavfilter | |
parent | 196dd13c76c213e79541c3a692873cdd59c0efa6 (diff) | |
download | ffmpeg-d39fae08866efebbfdf25951fbaff4df9d26e6b3.tar.gz |
avfilter/avf_showspectrum: fix scaling in zoom mode
Diffstat (limited to 'libavfilter')
-rw-r--r-- | libavfilter/avf_showspectrum.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/libavfilter/avf_showspectrum.c b/libavfilter/avf_showspectrum.c index 38d0a9d768..a750b9a3f1 100644 --- a/libavfilter/avf_showspectrum.c +++ b/libavfilter/avf_showspectrum.c @@ -340,12 +340,12 @@ static int run_channel_fft(AVFilterContext *ctx, void *arg, int jobnr, int nb_jo FFTComplex *h = s->fft_scratch[ch]; int L = s->buf_size; int N = s->win_size; - int M = s->win_size; + int M = s->win_size / 2; - phi = 2.0 * M_PI * (s->stop - s->start) / (double)inlink->sample_rate / (s->win_size - 1); + phi = 2.0 * M_PI * (s->stop - s->start) / (double)inlink->sample_rate / (M - 1); theta = 2.0 * M_PI * s->start / (double)inlink->sample_rate; - for (int n = 0; n < s->win_size; n++) { + for (int n = 0; n < M; n++) { h[n].re = cos(n * n / 2.0 * phi); h[n].im = sin(n * n / 2.0 * phi); } |