From 6adaa78ee935ef89439d4b38550165f13e880320 Mon Sep 17 00:00:00 2001
From: anders <anders@b3059339-0415-0410-9bf9-f77b7e298cf2>
Date: Sat, 28 Dec 2002 13:59:53 +0000
Subject: Changes includes: - Improved runtime control system - 3 New filter
 panning, compressor/limiter and a noise gate   - The compressor/limiter and
 the noise gate are not yet finished   - The panning filter does combined
 mixing and channel routing and     can be used to down-mix from stereo to
 mono (for example) - Improvements to volume and channel   - volume now has a
 very good soft clipping using sin()   - channel can handle generic routing of
 audio data - Conversion of all filters to handle floating point data -
 Cleanup of message printing - Fix for the sig 11 bug reported by Denes

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@8608 b3059339-0415-0410-9bf9-f77b7e298cf2
---
 libaf/af_tools.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 libaf/af_tools.c

(limited to 'libaf/af_tools.c')

diff --git a/libaf/af_tools.c b/libaf/af_tools.c
new file mode 100644
index 0000000000..6c2111f981
--- /dev/null
+++ b/libaf/af_tools.c
@@ -0,0 +1,79 @@
+#include <math.h>
+#include <af.h>
+
+/* Convert to gain value from dB. Returns AF_OK if of and AF_ERROR if
+   fail */
+inline int af_from_dB(int n, float* in, float* out, float k, float mi, float ma)
+{
+  int i = 0; 
+  // Sanity check
+  if(!in || !out) 
+    return AF_ERROR;
+
+  for(i=0;i<n;i++){
+    if(in[i]<=-200)
+      out[i]=0.0;
+    else
+      out[i]=pow(10.0,clamp(in[i],mi,ma)/k);
+  }
+  return AF_OK;
+}
+
+/* Convert from gain value to dB. Returns AF_OK if of and AF_ERROR if
+   fail */
+inline int af_to_dB(int n, float* in, float* out, float k)
+{
+  int i = 0; 
+  // Sanity check
+  if(!in || !out) 
+    return AF_ERROR;
+
+  for(i=0;i<AF_NCH;i++){
+    if(in[i] == 0.0)
+      out[i]=-200.0;
+    else
+      out[i]=k*log10(in[i]);
+  }
+  return AF_OK;
+}
+
+/* Convert from ms to sample time*/
+inline int af_from_ms(int n, float* in, float* out, int rate, float mi, float ma)
+{
+  int i = 0; 
+  // Sanity check
+  if(!in || !out) 
+    return AF_ERROR;
+
+  for(i=0;i<AF_NCH;i++)
+    out[i]=clamp(in[i],ma,mi);
+
+  return AF_OK;
+}
+
+/* Convert from sample time to ms */
+inline int af_to_ms(int n, float* in, float* out, int rate)
+{
+  int i = 0; 
+  // Sanity check
+  if(!in || !out) 
+    return AF_ERROR;
+
+  for(i=0;i<AF_NCH;i++)
+    out[i]=in[i];
+  
+  return AF_OK;
+}
+
+/* Helper function for testing the output format */
+inline int af_test_output(struct af_instance_s* af, af_data_t* out)
+{
+  if((af->data->format != out->format) || 
+     (af->data->bps    != out->bps)    ||
+     (af->data->rate   != out->rate)   ||
+     (af->data->nch    != out->nch)){
+    memcpy(out,af->data,sizeof(af_data_t));
+    return AF_FALSE;
+  }
+  return AF_OK;
+}
-- 
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