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avfilter/avf_showfreqs: add group delay data mode

This commit is contained in:
Paul B Mahol 2020-11-28 20:43:14 +01:00
parent f3891430fc
commit a01b037c90
2 changed files with 13 additions and 1 deletions
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1
doc/filters.texi
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@ -25230,6 +25230,7 @@ It accepts the following values:
@table @samp
@item magnitude
@item phase
@item delay
@end table
Default is @code{magnitude}.
@end table

13
libavfilter/avf_showfreqs.c
View File

@ -36,7 +36,7 @@
#include "internal.h"
#include "window_func.h"
enum DataMode { MAGNITUDE, PHASE, NB_DATA };
enum DataMode { MAGNITUDE, PHASE, DELAY, NB_DATA };
enum DisplayMode { LINE, BAR, DOT, NB_MODES };
enum ChannelMode { COMBINED, SEPARATE, NB_CMODES };
enum FrequencyScale { FS_LINEAR, FS_LOG, FS_RLOG, NB_FSCALES };
@ -120,6 +120,7 @@ static const AVOption showfreqs_options[] = {
{ "data", "set data mode", OFFSET(data_mode), AV_OPT_TYPE_INT, {.i64=MAGNITUDE}, 0, NB_DATA-1, FLAGS, "data" },
{ "magnitude", "show magnitude", 0, AV_OPT_TYPE_CONST, {.i64=MAGNITUDE}, 0, 0, FLAGS, "data" },
{ "phase", "show phase", 0, AV_OPT_TYPE_CONST, {.i64=PHASE}, 0, 0, FLAGS, "data" },
{ "delay", "show group delay",0, AV_OPT_TYPE_CONST, {.i64=DELAY}, 0, 0, FLAGS, "data" },
{ NULL }
};
@ -440,6 +441,16 @@ static int plot_freqs(AVFilterLink *inlink, AVFrame *in)
plot_freq(s, ch, a, f, fg, &prev_y, out, outlink);
}
break;
case DELAY:
plot_freq(s, ch, 0, 0, fg, &prev_y, out, outlink);
for (f = 1; f < s->nb_freq; f++) {
a = av_clipd((M_PI - P(IM(f, ch) * RE(f-1, ch) - IM(f-1, ch) * RE(f, ch),
RE(f, ch) * RE(f-1, ch) + IM(f, ch) * IM(f-1, ch))) / (2. * M_PI), 0, 1);
plot_freq(s, ch, a, f, fg, &prev_y, out, outlink);
}
break;
}
}