avfilter/af_sidechaincompress: add support for commands

doc/filters.texi

@@ -443,6 +443,10 @@ How much to use compressed signal in output. Default is 1.
 Range is between 0 and 1.
 @end table
 
+@subsection Commands
+
+This filter supports the all above options as @ref{commands}.
+
 @section acontrast
 Simple audio dynamic range compression/expansion filter.
 
@@ -4680,6 +4684,10 @@ How much to use compressed signal in output. Default is 1.
 Range is between 0 and 1.
 @end table
 
+@subsection Commands
+
+This filter supports the all above options as @ref{commands}.
+
 @subsection Examples
 
 @itemize

libavfilter/af_sidechaincompress.c

@@ -70,26 +70,27 @@ typedef struct SidechainCompressContext {
 #define OFFSET(x) offsetof(SidechainCompressContext, x)
 #define A AV_OPT_FLAG_AUDIO_PARAM
 #define F AV_OPT_FLAG_FILTERING_PARAM
+#define R AV_OPT_FLAG_RUNTIME_PARAM
 
 static const AVOption options[] = {
-    { "level_in",  "set input gain",     OFFSET(level_in),  AV_OPT_TYPE_DOUBLE, {.dbl=1},        0.015625,   64, A|F },
-    { "mode",      "set mode",           OFFSET(mode),      AV_OPT_TYPE_INT,    {.i64=0},               0,    1, A|F, "mode" },
-    {   "downward",0,                    0,                 AV_OPT_TYPE_CONST,  {.i64=0},               0,    0, A|F, "mode" },
-    {   "upward",  0,                    0,                 AV_OPT_TYPE_CONST,  {.i64=1},               0,    0, A|F, "mode" },
-    { "threshold", "set threshold",      OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0.125}, 0.000976563,    1, A|F },
-    { "ratio",     "set ratio",          OFFSET(ratio),     AV_OPT_TYPE_DOUBLE, {.dbl=2},               1,   20, A|F },
-    { "attack",    "set attack",         OFFSET(attack),    AV_OPT_TYPE_DOUBLE, {.dbl=20},           0.01, 2000, A|F },
-    { "release",   "set release",        OFFSET(release),   AV_OPT_TYPE_DOUBLE, {.dbl=250},          0.01, 9000, A|F },
-    { "makeup",    "set make up gain",   OFFSET(makeup),    AV_OPT_TYPE_DOUBLE, {.dbl=1},               1,   64, A|F },
-    { "knee",      "set knee",           OFFSET(knee),      AV_OPT_TYPE_DOUBLE, {.dbl=2.82843},         1,    8, A|F },
-    { "link",      "set link type",      OFFSET(link),      AV_OPT_TYPE_INT,    {.i64=0},               0,    1, A|F, "link" },
-    {   "average", 0,                    0,                 AV_OPT_TYPE_CONST,  {.i64=0},               0,    0, A|F, "link" },
-    {   "maximum", 0,                    0,                 AV_OPT_TYPE_CONST,  {.i64=1},               0,    0, A|F, "link" },
-    { "detection", "set detection",      OFFSET(detection), AV_OPT_TYPE_INT,    {.i64=1},               0,    1, A|F, "detection" },
-    {   "peak",    0,                    0,                 AV_OPT_TYPE_CONST,  {.i64=0},               0,    0, A|F, "detection" },
-    {   "rms",     0,                    0,                 AV_OPT_TYPE_CONST,  {.i64=1},               0,    0, A|F, "detection" },
-    { "level_sc",  "set sidechain gain", OFFSET(level_sc),  AV_OPT_TYPE_DOUBLE, {.dbl=1},        0.015625,   64, A|F },
-    { "mix",       "set mix",            OFFSET(mix),       AV_OPT_TYPE_DOUBLE, {.dbl=1},               0,    1, A|F },
+    { "level_in",  "set input gain",     OFFSET(level_in),  AV_OPT_TYPE_DOUBLE, {.dbl=1},        0.015625,   64, A|F|R },
+    { "mode",      "set mode",           OFFSET(mode),      AV_OPT_TYPE_INT,    {.i64=0},               0,    1, A|F|R, "mode" },
+    {   "downward",0,                    0,                 AV_OPT_TYPE_CONST,  {.i64=0},               0,    0, A|F|R, "mode" },
+    {   "upward",  0,                    0,                 AV_OPT_TYPE_CONST,  {.i64=1},               0,    0, A|F|R, "mode" },
+    { "threshold", "set threshold",      OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0.125}, 0.000976563,    1, A|F|R },
+    { "ratio",     "set ratio",          OFFSET(ratio),     AV_OPT_TYPE_DOUBLE, {.dbl=2},               1,   20, A|F|R },
+    { "attack",    "set attack",         OFFSET(attack),    AV_OPT_TYPE_DOUBLE, {.dbl=20},           0.01, 2000, A|F|R },
+    { "release",   "set release",        OFFSET(release),   AV_OPT_TYPE_DOUBLE, {.dbl=250},          0.01, 9000, A|F|R },
+    { "makeup",    "set make up gain",   OFFSET(makeup),    AV_OPT_TYPE_DOUBLE, {.dbl=1},               1,   64, A|F|R },
+    { "knee",      "set knee",           OFFSET(knee),      AV_OPT_TYPE_DOUBLE, {.dbl=2.82843},         1,    8, A|F|R },
+    { "link",      "set link type",      OFFSET(link),      AV_OPT_TYPE_INT,    {.i64=0},               0,    1, A|F|R, "link" },
+    {   "average", 0,                    0,                 AV_OPT_TYPE_CONST,  {.i64=0},               0,    0, A|F|R, "link" },
+    {   "maximum", 0,                    0,                 AV_OPT_TYPE_CONST,  {.i64=1},               0,    0, A|F|R, "link" },
+    { "detection", "set detection",      OFFSET(detection), AV_OPT_TYPE_INT,    {.i64=1},               0,    1, A|F|R, "detection" },
+    {   "peak",    0,                    0,                 AV_OPT_TYPE_CONST,  {.i64=0},               0,    0, A|F|R, "detection" },
+    {   "rms",     0,                    0,                 AV_OPT_TYPE_CONST,  {.i64=1},               0,    0, A|F|R, "detection" },
+    { "level_sc",  "set sidechain gain", OFFSET(level_sc),  AV_OPT_TYPE_DOUBLE, {.dbl=1},        0.015625,   64, A|F|R },
+    { "mix",       "set mix",            OFFSET(mix),       AV_OPT_TYPE_DOUBLE, {.dbl=1},               0,    1, A|F|R },
     { NULL }
 };
 
@@ -214,6 +215,20 @@ static void compressor(SidechainCompressContext *s,
     }
 }
 
+static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
+                           char *res, int res_len, int flags)
+{
+    int ret;
+
+    ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
+    if (ret < 0)
+        return ret;
+
+    compressor_config_output(ctx->outputs[0]);
+
+    return 0;
+}
+
 #if CONFIG_SIDECHAINCOMPRESS_FILTER
 static int activate(AVFilterContext *ctx)
 {
@@ -382,6 +397,7 @@ AVFilter ff_af_sidechaincompress = {
     .uninit         = uninit,
     .inputs         = sidechaincompress_inputs,
     .outputs        = sidechaincompress_outputs,
+    .process_command = process_command,
 };
 #endif  /* CONFIG_SIDECHAINCOMPRESS_FILTER */
 
@@ -475,5 +491,6 @@ AVFilter ff_af_acompressor = {
     .query_formats  = acompressor_query_formats,
     .inputs         = acompressor_inputs,
     .outputs        = acompressor_outputs,
+    .process_command = process_command,
 };
 #endif  /* CONFIG_ACOMPRESSOR_FILTER */