--- libao2/ao_arts.c.orig	2003-03-21 17:42:50.000000000 +0100
+++ libao2/ao_arts.c	2004-01-19 19:06:05.000000000 +0100
@@ -10,12 +10,17 @@
 #include <artsc.h>
 #include <stdio.h>
 
-#include "audio_out.h"
-#include "audio_out_internal.h"
-#include "afmt.h"
+#include <sys/ioctl.h>
+#include <fcntl.h>
+
 #include "../config.h"
 #include "../mp_msg.h"
 
+#include "afmt.h"
+
+#include "audio_out.h"
+#include "audio_out_internal.h"
+
 #define OBTAIN_BITRATE(a) (((a != AFMT_U8) && (a != AFMT_S8)) ? 16 : 8)
 
 /* Feel free to experiment with the following values: */
@@ -34,9 +39,49 @@
 
 LIBAO_EXTERN(arts)
 
-static int control(int cmd, void *arg)
-{
-	return(CONTROL_UNKNOWN);
+// to set/get/query special features/parameters
+static int control(int cmd,void *arg){
+    switch(cmd){
+	case AOCONTROL_QUERY_FORMAT:
+	    return CONTROL_TRUE;
+	case AOCONTROL_GET_VOLUME:
+	case AOCONTROL_SET_VOLUME:
+	{
+	    ao_control_vol_t *vol = (ao_control_vol_t *)arg;
+	    int fd, v, devs;
+
+	    if(ao_data.format == AFMT_AC3)
+		return CONTROL_TRUE;
+    
+	    if ((fd = open(PATH_DEV_MIXER, O_RDONLY)) > 0)
+	    {
+		ioctl(fd, SOUND_MIXER_READ_DEVMASK, &devs);
+		if (devs & SOUND_MASK_PCM)
+		{
+		    if (cmd == AOCONTROL_GET_VOLUME)
+		    {
+		        ioctl(fd, SOUND_MIXER_READ_PCM, &v);
+			vol->right = (v & 0xFF00) >> 8;
+			vol->left = v & 0x00FF;
+		    }
+		    else
+		    {
+		        v = ((int)vol->right << 8) | (int)vol->left;
+			ioctl(fd, SOUND_MIXER_WRITE_PCM, &v);
+		    }
+		}
+		else
+		{
+		    close(fd);
+		    return CONTROL_ERROR;
+		}
+		close(fd);
+		return CONTROL_OK;
+	    }
+	}
+	return CONTROL_ERROR;
+    }
+    return CONTROL_UNKNOWN;
 }
 
 static int init(int rate_hz, int channels, int format, int flags)