command: add af-command command

Similar to vf-command. Requested. Untested.

DOCS/man/input.rst

@@ -700,6 +700,9 @@ Input Commands that are Possibly Subject to Change
     specific. Currently, this only works with the ``lavfi`` filter - see
     the libavfilter documentation for which commands a filter supports.
 
+``af-command "<label>" "<cmd>" "<args>"``
+    Same as ``vf-command``, but for video filters.
+
 Undocumented commands: ``tv-last-channel`` (TV/DVB only),
 ``ao-reload`` (experimental/internal).
 

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)

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);

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;

input/cmd_list.c

@@ -180,6 +180,7 @@ const struct mp_cmd_def mp_cmds[] = {
   { MP_CMD_DROP_BUFFERS, "drop-buffers", },
 
   { MP_CMD_AF, "af", { ARG_STRING, ARG_STRING } },
+  { MP_CMD_AF_COMMAND, "af-command", { ARG_STRING, ARG_STRING, ARG_STRING } },
   { MP_CMD_AO_RELOAD, "ao-reload", },
 
   { MP_CMD_VF, "vf", { ARG_STRING, ARG_STRING } },

input/cmd_list.h

@@ -92,6 +92,7 @@ enum mp_command_type {
 
     /// Audio Filter commands
     MP_CMD_AF,
+    MP_CMD_AF_COMMAND,
     MP_CMD_AO_RELOAD,
 
     /// Video filter commands

player/command.c

@@ -4937,6 +4937,12 @@ int run_command(struct MPContext *mpctx, struct mp_cmd *cmd, struct mpv_node *re
         return vf_send_command(mpctx->vo_chain->vf, cmd->args[0].v.s,
                                cmd->args[1].v.s, cmd->args[2].v.s);
 
+    case MP_CMD_AF_COMMAND:
+        if (!mpctx->ao_chain)
+            return -1;
+        return af_send_command(mpctx->ao_chain->af, cmd->args[0].v.s,
+                               cmd->args[1].v.s, cmd->args[2].v.s);
+
     case MP_CMD_SCRIPT_BINDING: {
         mpv_event_client_message event = {0};
         char *name = cmd->args[0].v.s;