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avfilter/avf_showspectrum: add option to set gain for calculating color intensity

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Inspired by Sonic Visualizer.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2016-01-04 12:50:36 +01:00
parent 1cb2331eca
commit 6defda1cdb
2 changed files with 13 additions and 1 deletions
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8
doc/filters.texi
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@ -14688,6 +14688,10 @@ Set orientation of time vs frequency axis. Can be @code{vertical} or
Set ratio of overlap window. Default value is @code{0}.
When value is @code{1} overlap is set to recommended size for specific
window function currently used.
@item gain
Set scale gain for calculating intensity color values.
Default value is @code{1}.
@end table
The usage is very similar to the showwaves filter; see the examples in that
@ -14809,6 +14813,10 @@ Default value is @code{hann}.
@item orientation
Set orientation of time vs frequency axis. Can be @code{vertical} or
@code{horizontal}. Default is @code{vertical}.
@item gain
Set scale gain for calculating intensity color values.
Default value is @code{1}.
@end table
@subsection Examples

6
libavfilter/avf_showspectrum.c
View File

@ -68,6 +68,7 @@ typedef struct {
int win_size;
double win_scale;
float overlap;
float gain;
int skip_samples;
float *combine_buffer; ///< color combining buffer (3 * h items)
AVAudioFifo *fifo;
@ -125,6 +126,7 @@ static const AVOption showspectrum_options[] = {
{ "vertical", NULL, 0, AV_OPT_TYPE_CONST, {.i64=VERTICAL}, 0, 0, FLAGS, "orientation" },
{ "horizontal", NULL, 0, AV_OPT_TYPE_CONST, {.i64=HORIZONTAL}, 0, 0, FLAGS, "orientation" },
{ "overlap", "set window overlap", OFFSET(overlap), AV_OPT_TYPE_FLOAT, {.dbl = 0}, 0, 1, FLAGS },
{ "gain", "set scale gain", OFFSET(gain), AV_OPT_TYPE_FLOAT, {.dbl = 1}, 0, 128, FLAGS },
{ NULL }
};
@ -497,6 +499,7 @@ static int plot_spectrum_column(AVFilterLink *inlink, AVFrame *insamples)
ShowSpectrumContext *s = ctx->priv;
AVFrame *outpicref = s->outpicref;
const double w = s->win_scale;
const float g = s->gain;
int h = s->orientation == VERTICAL ? s->channel_height : s->channel_width;
int ch, plane, x, y;
@ -562,7 +565,7 @@ static int plot_spectrum_column(AVFilterLink *inlink, AVFrame *insamples)
float *out = &s->combine_buffer[3 * row];
/* get magnitude */
float a = w * magnitudes[y];
float a = g * w * magnitudes[y];
/* apply scale */
switch (s->scale) {
@ -814,6 +817,7 @@ static const AVOption showspectrumpic_options[] = {
{ "orientation", "set orientation", OFFSET(orientation), AV_OPT_TYPE_INT, {.i64=VERTICAL}, 0, NB_ORIENTATIONS-1, FLAGS, "orientation" },
{ "vertical", NULL, 0, AV_OPT_TYPE_CONST, {.i64=VERTICAL}, 0, 0, FLAGS, "orientation" },
{ "horizontal", NULL, 0, AV_OPT_TYPE_CONST, {.i64=HORIZONTAL}, 0, 0, FLAGS, "orientation" },
{ "gain", "set scale gain", OFFSET(gain), AV_OPT_TYPE_FLOAT, {.dbl = 1}, 0, 128, FLAGS },
{ NULL }
};