[FFmpeg-devel] [PATCH 2/2] avfilter/af_ladspa: allow changing controls dynamically
Paul B Mahol
onemda at gmail.com
Tue Sep 24 18:49:00 CEST 2013
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
doc/filters.texi | 10 ++++++++++
libavfilter/af_ladspa.c | 13 +++++++++++++
2 files changed, 23 insertions(+)
diff --git a/doc/filters.texi b/doc/filters.texi
index 800a666..a349bee 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -1502,6 +1502,16 @@ ladspa=caps:Eq10X2:c=c0=-48|c9=-24|c3=12|c4=2
@end example
@end itemize
+ at subsection Commands
+
+This filter supports the following commands:
+ at table @option
+ at item ci
+Modify the @var{i}-th control value.
+
+If the specified value is not valid, it is ignored and prior one is kept.
+ at end table
+
@section lowpass
Apply a low-pass filter with 3dB point frequency.
diff --git a/libavfilter/af_ladspa.c b/libavfilter/af_ladspa.c
index f25699e..904ad14 100644
--- a/libavfilter/af_ladspa.c
+++ b/libavfilter/af_ladspa.c
@@ -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;
+ int port;
+
+ if (sscanf(cmd, "c%d", &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,
--
1.7.11.2
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