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avfilter/af_ladspa: allow changing controls dynamically

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2013-09-24 16:20:53 +00:00
parent 4d86a945df
commit 110a2f446d
2 changed files with 23 additions and 0 deletions
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10
doc/filters.texi
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@ -1502,6 +1502,16 @@ ladspa=caps:Eq10X2:c=c0=-48|c9=-24|c3=12|c4=2
@end example
@end itemize
@subsection Commands
This filter supports the following commands:
@table @option
@item cN
Modify the @var{N}-th control value.
If the specified value is not valid, it is ignored and prior one is kept.
@end table
@section lowpass
Apply a low-pass filter with 3dB point frequency.

13
libavfilter/af_ladspa.c
View File

@ -662,6 +662,18 @@ static av_cold void uninit(AVFilterContext *ctx)
av_freep(&ctx->input_pads[0].name);
}
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
char *res, int res_len, int flags)
{
LADSPA_Data value;
unsigned long port;
if (sscanf(cmd, "c%ld", &port) + sscanf(args, "%f", &value) != 2)
return AVERROR(EINVAL);
return set_control(ctx, port, value);
}
static const AVFilterPad ladspa_outputs[] = {
{
.name = "default",
@ -680,6 +692,7 @@ AVFilter avfilter_af_ladspa = {
.init = init,
.uninit = uninit,
.query_formats = query_formats,
.process_command = process_command,
.inputs = 0,
.outputs = ladspa_outputs,
.flags = AVFILTER_FLAG_DYNAMIC_INPUTS,