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avfilter/avf_showspectrum: fix scaling in zoom mode

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This commit is contained in:
Paul B Mahol 2018-10-05 00:15:26 +02:00
parent 196dd13c76
commit d39fae0886
1 changed files with 3 additions and 3 deletions
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6
libavfilter/avf_showspectrum.c
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@ -340,12 +340,12 @@ static int run_channel_fft(AVFilterContext *ctx, void *arg, int jobnr, int nb_jo
FFTComplex *h = s->fft_scratch[ch]; FFTComplex *h = s->fft_scratch[ch];
int L = s->buf_size; int L = s->buf_size;
int N = s->win_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; 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].re = cos(n * n / 2.0 * phi);
h[n].im = sin(n * n / 2.0 * phi); h[n].im = sin(n * n / 2.0 * phi);
} }