command: add af-command command

Similar to vf-command. Requested. Untested.

3 files changed, 21 insertions, 0 deletions

diff --git a/audio/filter/af.c b/audio/filter/af.c
index 475016d2ea..18019d8930 100644
--- a/audio/filter/af.c
+++ b/audio/filter/af.c
@@ -696,6 +696,17 @@ int af_control_by_label(struct af_stream *s, int cmd, void *arg, bstr label)
     }
 }
 
+int af_send_command(struct af_stream *s, char *label, char *cmd, char *arg)
+{
+    char *args[2] = {cmd, arg};
+    if (strcmp(label, "all") == 0) {
+        af_control_all(s, AF_CONTROL_COMMAND, args);
+        return 0;
+    } else {
+        return af_control_by_label(s, AF_CONTROL_COMMAND, args, bstr0(label));
+    }
+}
+
 // Used by filters to add a filtered frame to the output queue.
 // Ownership of frame is transferred from caller to the filter chain.
 void af_add_output_frame(struct af_instance *af, struct mp_audio *frame)
diff --git a/audio/filter/af.h b/audio/filter/af.h
index 0e73693ac9..9c49081f66 100644
--- a/audio/filter/af.h
+++ b/audio/filter/af.h
@@ -124,6 +124,7 @@ enum af_control {
     AF_CONTROL_SET_PLAYBACK_SPEED,
     AF_CONTROL_SET_PLAYBACK_SPEED_RESAMPLE,
     AF_CONTROL_GET_METADATA,
+    AF_CONTROL_COMMAND,
 };
 
 // Argument for AF_CONTROL_SET_PAN_LEVEL
@@ -144,6 +145,7 @@ struct af_instance *af_control_any_rev(struct af_stream *s, int cmd, void *arg);
 void af_control_all(struct af_stream *s, int cmd, void *arg);
 int af_control_by_label(struct af_stream *s, int cmd, void *arg, bstr label);
 void af_seek_reset(struct af_stream *s);
+int af_send_command(struct af_stream *s, char *label, char *cmd, char *arg);
 
 void af_add_output_frame(struct af_instance *af, struct mp_audio *frame);
 int af_filter_frame(struct af_stream *s, struct mp_audio *frame);
diff --git a/audio/filter/af_lavfi.c b/audio/filter/af_lavfi.c
index 1960ddc247..616c5425e1 100644
--- a/audio/filter/af_lavfi.c
+++ b/audio/filter/af_lavfi.c
@@ -222,6 +222,14 @@ static int control(struct af_instance *af, int cmd, void *arg)
 
         return mp_audio_config_equals(in, &orig_in) ? AF_OK : AF_FALSE;
     }
+    case AF_CONTROL_COMMAND: {
+        if (!p->graph)
+            break;
+        char **args = arg;
+        return avfilter_graph_send_command(p->graph, "all",
+                                           args[0], args[1], &(char){0}, 0, 0)
+                >= 0 ? CONTROL_OK : CONTROL_ERROR;
+    }
     case AF_CONTROL_GET_METADATA:
         if (p->metadata) {
             *(struct mp_tags *)arg = *p->metadata;