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Code Issues Releases Activity

avfilter/avf_showvolume: use current peak value for picking colors

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This commit is contained in:
Paul B Mahol 2016-08-18 20:14:58 +02:00
parent b3c6e89d48
commit e2a39b103e
2 changed files with 8 additions and 3 deletions
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3
doc/filters.texi
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@ -16899,6 +16899,9 @@ The expression can use the following variables:
@item VOLUME
Current max volume of channel in dB.
@item PEAK
Current peak.
@item CHANNEL
Current channel number, starting from 0.
@end table

8
libavfilter/avf_showvolume.c
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@ -31,8 +31,8 @@
#include "video.h"
#include "internal.h"
static const char *const var_names[] = { "VOLUME", "CHANNEL", NULL };
enum { VAR_VOLUME, VAR_CHANNEL, VAR_VARS_NB };
static const char *const var_names[] = { "VOLUME", "CHANNEL", "PEAK", NULL };
enum { VAR_VOLUME, VAR_CHANNEL, VAR_PEAK, VAR_VARS_NB };
typedef struct ShowVolumeContext {
const AVClass *class;
@ -61,7 +61,7 @@ static const AVOption showvolume_options[] = {
{ "w", "set channel width", OFFSET(w), AV_OPT_TYPE_INT, {.i64=400}, 80, 8192, FLAGS },
{ "h", "set channel height", OFFSET(h), AV_OPT_TYPE_INT, {.i64=20}, 1, 900, FLAGS },
{ "f", "set fade", OFFSET(f), AV_OPT_TYPE_DOUBLE, {.dbl=0.95}, 0.001, 1, FLAGS },
{ "c", "set volume color expression", OFFSET(color), AV_OPT_TYPE_STRING, {.str="if(gte(VOLUME,-6), if(gte(VOLUME,-2), if(gte(VOLUME,-1), if(gt(VOLUME,0), 0xff0000ff, 0xff0066ff), 0xff00ffff),0xff00ff00),0xffff0000)"}, 0, 0, FLAGS },
{ "c", "set volume color expression", OFFSET(color), AV_OPT_TYPE_STRING, {.str="PEAK*255+floor((1-PEAK)*255)*256"}, 0, 0, FLAGS },
{ "t", "display channel names", OFFSET(draw_text), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
{ "v", "display volume value", OFFSET(draw_volume), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
{ "o", "set orientation", OFFSET(orientation), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "orientation" },
@ -228,6 +228,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
for (i = 0; i < insamples->nb_samples; i++)
max = FFMAX(max, src[i]);
s->values[c * VAR_VARS_NB + VAR_PEAK] = max;
s->values[c * VAR_VARS_NB + VAR_VOLUME] = 20.0 * log10(max);
max = av_clipf(max, 0, 1);
s->values[c * VAR_VARS_NB + VAR_CHANNEL] = c;
@ -258,6 +259,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
for (i = 0; i < insamples->nb_samples; i++)
max = FFMAX(max, src[i]);
s->values[c * VAR_VARS_NB + VAR_PEAK] = max;
s->values[c * VAR_VARS_NB + VAR_VOLUME] = 20.0 * log10(max);
max = av_clipf(max, 0, 1);
s->values[c * VAR_VARS_NB + VAR_CHANNEL] = c;