Add AF_CONTROL_PAN_BALANCE control

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@23571 b3059339-0415-0410-9bf9-f77b7e298cf2

2 files changed, 19 insertions, 0 deletions

diff --git a/libaf/af_pan.c b/libaf/af_pan.c
index 12955897d7..7d25e1afde 100644
--- a/libaf/af_pan.c
+++ b/libaf/af_pan.c
@@ -111,6 +111,23 @@ static int control(struct af_instance_s* af, int cmd, void* arg)
   case AF_CONTROL_PAN_NOUT | AF_CONTROL_GET:
     *(int*)arg = af->data->nch;
     return AF_OK;
+  case AF_CONTROL_PAN_BALANCE | AF_CONTROL_SET:{
+    float val = *(float*)arg;
+    if (s->nch)
+      return AF_ERROR;
+    if (af->data->nch >= 2) {
+      s->level[0][0] = min(1.f, 1.f - val);
+      s->level[0][1] = max(0.f, val);
+      s->level[1][0] = max(0.f, -val);
+      s->level[1][1] = min(1.f, 1.f + val);
+    }
+    return AF_OK;
+  }
+  case AF_CONTROL_PAN_BALANCE | AF_CONTROL_GET:
+    if (s->nch)
+      return AF_ERROR;
+    *(float*)arg = s->level[0][1] - s->level[1][0];
+    return AF_OK;
   }
   return AF_UNKNOWN;
 }
diff --git a/libaf/control.h b/libaf/control.h
index b580a6f7fa..80eff7c584 100644
--- a/libaf/control.h
+++ b/libaf/control.h
@@ -193,6 +193,8 @@ typedef struct af_control_ext_s{
 // Number of outputs from pan, arg is int*
 #define AF_CONTROL_PAN_NOUT	 	0x00001B00 | AF_CONTROL_FILTER_SPECIFIC
  
+// Balance, arg is float*; range -1 (left) to 1 (right), 0 center
+#define AF_CONTROL_PAN_BALANCE	 	0x00002500 | AF_CONTROL_FILTER_SPECIFIC
 
 // Set equalizer gain, arg is a control_ext with a float* 
 #define AF_CONTROL_EQUALIZER_GAIN 	0x00001C00 | AF_CONTROL_FILTER_SPECIFIC