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| author | Paul B Mahol <onemda@gmail.com> | 2016-08-17 21:56:42 +0200 |
|---|---|---|
| committer | Paul B Mahol <onemda@gmail.com> | 2016-08-17 22:02:29 +0200 |
| commit | 5ee5f4b13cc4a512d5a6730bc1b4d913c9a9dc11 (patch) | |
| tree | a697737f680a8cf7334cc99b2f732359703888a1 /libavfilter/avf_showfreqs.c | |
| parent | 345c252e9c19621f86a837688015ca1fae92d96f (diff) | |
| download | ffmpeg-5ee5f4b13cc4a512d5a6730bc1b4d913c9a9dc11.tar.gz | |
avfilter/avf_showfreqs: make minimum amplitude for log scaler configurable
Diffstat (limited to 'libavfilter/avf_showfreqs.c')
| -rw-r--r-- | libavfilter/avf_showfreqs.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/libavfilter/avf_showfreqs.c b/libavfilter/avf_showfreqs.c index 6f9d486d13..e2a923b864 100644 --- a/libavfilter/avf_showfreqs.c +++ b/libavfilter/avf_showfreqs.c @@ -18,6 +18,7 @@ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ +#include <float.h> #include <math.h> #include "libavcodec/avfft.h" @@ -53,6 +54,7 @@ typedef struct ShowFreqsContext { float **avg_data; float *window_func_lut; float overlap; + float minamp; int hop_size; int nb_channels; int nb_freq; @@ -122,6 +124,7 @@ static const AVOption showfreqs_options[] = { { "cmode", "set channel mode", OFFSET(cmode), AV_OPT_TYPE_INT, {.i64=COMBINED}, 0, NB_CMODES-1, FLAGS, "cmode" }, { "combined", "show all channels in same window", 0, AV_OPT_TYPE_CONST, {.i64=COMBINED}, 0, 0, FLAGS, "cmode" }, { "separate", "show each channel in own window", 0, AV_OPT_TYPE_CONST, {.i64=SEPARATE}, 0, 0, FLAGS, "cmode" }, + { "minamp", "set minimum amplitude", OFFSET(minamp), AV_OPT_TYPE_FLOAT, {.dbl=1e-6}, FLT_MIN, 1e-6, FLAGS }, { NULL } }; @@ -285,6 +288,7 @@ static inline void plot_freq(ShowFreqsContext *s, int ch, AVFrame *out, AVFilterLink *outlink) { const int w = s->w; + const float min = s->minamp; const float avg = s->avg_data[ch][f]; const float bsize = get_bsize(s, f); const int sx = get_sx(s, f); @@ -299,7 +303,7 @@ static inline void plot_freq(ShowFreqsContext *s, int ch, a = 1.0 - cbrt(a); break; case AS_LOG: - a = log(av_clipd(a, 1e-6, 1)) / log(1e-6); + a = log(av_clipd(a, min, 1)) / log(min); break; case AS_LINEAR: a = 1.0 - a; |