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avfilter/avf_showvolume: add background opacity option

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This makes output more visible when overlayed.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2018-03-22 23:08:33 +01:00
parent 016d40011a
commit b78d55b2e6
2 changed files with 16 additions and 4 deletions
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5
doc/filters.texi
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@ -19941,8 +19941,11 @@ Set orientation, can be @code{horizontal} or @code{vertical},
default is @code{horizontal}.
@item s
Set step size, allowed range s [0, 5]. Default is 0, which means
Set step size, allowed range is [0, 5]. Default is 0, which means
step is disabled.
@item p
Set background opacity, allowed range is [0, 1]. Default is 0.
@end table
@section showwaves

15
libavfilter/avf_showvolume.c
View File

@ -43,6 +43,7 @@ typedef struct ShowVolumeContext {
char *color;
int orientation;
int step;
float bgopacity;
AVFrame *out;
AVExpr *c_expr;
@ -69,6 +70,7 @@ static const AVOption showvolume_options[] = {
{ "h", "horizontal", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "orientation" },
{ "v", "vertical", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "orientation" },
{ "s", "set step size", OFFSET(step), AV_OPT_TYPE_INT, {.i64=0}, 0, 5, FLAGS },
{ "p", "set background opacity", OFFSET(bgopacity), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 1, FLAGS },
{ NULL }
};
@ -224,18 +226,25 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
return AVERROR(ENOMEM);
}
for (i = 0; i < outlink->h; i++)
memset(s->out->data[0] + i * s->out->linesize[0], 0, outlink->w * 4);
for (i = 0; i < outlink->h; i++) {
uint32_t *dst = (uint32_t *)(s->out->data[0] + i * s->out->linesize[0]);
const uint32_t bg = (uint32_t)(s->bgopacity * 255) << 24;
for (j = 0; j < outlink->w; j++)
AV_WN32A(dst + j, bg);
}
}
s->out->pts = insamples->pts;
for (j = 0; j < outlink->h; j++) {
uint8_t *dst = s->out->data[0] + j * s->out->linesize[0];
const uint32_t alpha = s->bgopacity * 255;
for (k = 0; k < outlink->w; k++) {
dst[k * 4 + 0] = FFMAX(dst[k * 4 + 0] * s->f, 0);
dst[k * 4 + 1] = FFMAX(dst[k * 4 + 1] * s->f, 0);
dst[k * 4 + 2] = FFMAX(dst[k * 4 + 2] * s->f, 0);
dst[k * 4 + 3] = FFMAX(dst[k * 4 + 3] * s->f, 0);
dst[k * 4 + 3] = FFMAX(dst[k * 4 + 3] * s->f, alpha);
}
}