From bf4b07cf12b689519b0a45263245980b6a7970ad Mon Sep 17 00:00:00 2001
From: alex <alex@b3059339-0415-0410-9bf9-f77b7e298cf2>
Date: Mon, 31 Jan 2005 11:46:01 +0000
Subject: now supports float based operation aswell

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@14625 b3059339-0415-0410-9bf9-f77b7e298cf2
---
 libaf/af_extrastereo.c | 45 ++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 40 insertions(+), 5 deletions(-)

(limited to 'libaf')

diff --git a/libaf/af_extrastereo.c b/libaf/af_extrastereo.c
index f04ef080f7..6342e677d4 100644
--- a/libaf/af_extrastereo.c
+++ b/libaf/af_extrastereo.c
@@ -25,22 +25,35 @@ typedef struct af_extrastereo_s
     float mul;
 }af_extrastereo_t;
 
+static af_data_t* play_s16(struct af_instance_s* af, af_data_t* data);
+static af_data_t* play_float(struct af_instance_s* af, af_data_t* data);
+
 // Initialization and runtime control
 static int control(struct af_instance_s* af, int cmd, void* arg)
 {
   af_extrastereo_t* s   = (af_extrastereo_t*)af->setup; 
 
   switch(cmd){
-  case AF_CONTROL_REINIT:
+  case AF_CONTROL_REINIT:{
     // Sanity check
     if(!arg) return AF_ERROR;
     
     af->data->rate   = ((af_data_t*)arg)->rate;
     af->data->nch    = 2;
-    af->data->format = AF_FORMAT_S16_NE;
-    af->data->bps    = 2;
+    if (((af_data_t*)arg)->format == AF_FORMAT_FLOAT_NE)
+    {
+	af->data->format = AF_FORMAT_FLOAT_NE;
+	af->data->bps = 4;
+	af->play = play_float;
+    }// else
+    {
+	af->data->format = AF_FORMAT_S16_NE;
+	af->data->bps = 2;
+	af->play = play_s16;
+    }
 
     return af_test_output(af,(af_data_t*)arg);
+  }
   case AF_CONTROL_COMMAND_LINE:{
     float f;
     sscanf((char*)arg,"%f", &f);
@@ -67,7 +80,7 @@ static void uninit(struct af_instance_s* af)
 }
 
 // Filter data through filter
-static af_data_t* play(struct af_instance_s* af, af_data_t* data)
+static af_data_t* play_s16(struct af_instance_s* af, af_data_t* data)
 {
   af_extrastereo_t *s = af->setup;
   register int i = 0;
@@ -89,11 +102,33 @@ static af_data_t* play(struct af_instance_s* af, af_data_t* data)
   return data;
 }
 
+static af_data_t* play_float(struct af_instance_s* af, af_data_t* data)
+{
+  af_extrastereo_t *s = af->setup;
+  register int i = 0;
+  float *a = (float*)data->audio;	// Audio data
+  int len = data->len/4;		// Number of samples
+  float avg, l, r;
+  
+  for (i = 0; i < len; i+=2)
+  {
+    avg = (a[i] + a[i + 1]) / 2;
+    
+    l = avg + (s->mul * (a[i] - avg));
+    r = avg + (s->mul * (a[i + 1] - avg));
+    
+    a[i] = af_softclip(l);
+    a[i + 1] = af_softclip(r);
+  }
+
+  return data;
+}
+
 // Allocate memory and set function pointers
 static int open(af_instance_t* af){
   af->control=control;
   af->uninit=uninit;
-  af->play=play;
+  af->play=play_s16;
   af->mul.n=1;
   af->mul.d=1;
   af->data=calloc(1,sizeof(af_data_t));
-- 
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