diff options
| author | Clément Bœsch <clement@stupeflix.com> | 2013-11-20 16:35:48 +0100 |
|---|---|---|
| committer | Clément Bœsch <clement@stupeflix.com> | 2013-11-20 16:35:48 +0100 |
| commit | 9c8b24080638da34e7261b742168855ce85c277f (patch) | |
| tree | f80b6bf431602ad116b1c3ab9b4c9e94ad6b9767 /libavfilter | |
| parent | 3e69f7c22106c45485becf3341c4ea3c67d02acc (diff) | |
avfilter/showspectrum: add blackman window.
Diffstat (limited to 'libavfilter')
| -rw-r--r-- | libavfilter/avf_showspectrum.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/libavfilter/avf_showspectrum.c b/libavfilter/avf_showspectrum.c index d3324403e3..e0ea47ac32 100644 --- a/libavfilter/avf_showspectrum.c +++ b/libavfilter/avf_showspectrum.c @@ -37,7 +37,7 @@ enum DisplayMode { COMBINED, SEPARATE, NB_MODES }; enum DisplayScale { LINEAR, SQRT, CBRT, LOG, NB_SCALES }; enum ColorMode { CHANNEL, INTENSITY, NB_CLMODES }; -enum WindowFunc { WFUNC_NONE, WFUNC_HANN, WFUNC_HAMMING, NB_WFUNC }; +enum WindowFunc { WFUNC_NONE, WFUNC_HANN, WFUNC_HAMMING, WFUNC_BLACKMAN, NB_WFUNC }; typedef struct { const AVClass *class; @@ -84,6 +84,7 @@ static const AVOption showspectrum_options[] = { { "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64 = WFUNC_HANN}, 0, NB_WFUNC-1, FLAGS, "win_func" }, { "hann", "Hann window", 0, AV_OPT_TYPE_CONST, {.i64 = WFUNC_HANN}, INT_MIN, INT_MAX, FLAGS, "win_func" }, { "hamming", "Hamming window", 0, AV_OPT_TYPE_CONST, {.i64 = WFUNC_HAMMING}, INT_MIN, INT_MAX, FLAGS, "win_func" }, + { "blackman", "Blackman window", 0, AV_OPT_TYPE_CONST, {.i64 = WFUNC_BLACKMAN}, INT_MIN, INT_MAX, FLAGS, "win_func" }, { NULL } }; @@ -219,6 +220,11 @@ static int config_output(AVFilterLink *outlink) for (i = 0; i < win_size; i++) s->window_func_lut[i] = .54f - .46f * cos(2*M_PI*i / (win_size-1)); break; + case WFUNC_BLACKMAN: { + for (i = 0; i < win_size; i++) + s->window_func_lut[i] = .42f - .5f*cos(2*M_PI*i / (win_size-1)) + .08f*cos(4*M_PI*i / (win_size-1)); + break; + } default: av_assert0(0); } |