Pass parameter values through hosts. Add DbToLinear.

Author: mikeoliphant

AudioPlugSharp/AudioPluginParameter.cs

@@ -92,6 +92,11 @@ public AudioPluginParameter()
             ValueFormat = "{0:0.0}";
         }
 
+        public static double DbToLinear(double db)
+        {
+            return Math.Pow(10.0, 0.05 * db);
+        }
+
         public double GetValueNormalized(double value)
         {
             return (value - MinValue) / (MaxValue - MinValue);

AudioPlugSharpHost/AudioPlugSharpHost.cs

@@ -215,10 +215,12 @@ public void BeginEdit(int parameter)
 
         public void EndEdit(int parameter)
         {
+            PerformEdit(parameter, (Plugin as IAudioPluginEditor).Parameters[parameter].NormalizedEditValue);
         }
 
         public void PerformEdit(int parameter, double normalizedValue)
         {
+            (Plugin as IAudioPluginProcessor).Parameters[parameter].NormalizedProcessValue = normalizedValue;
         }
 
         public void ProcessAllEvents()

AudioPlugSharpHost/AudioPlugSharpHost.csproj

@@ -6,7 +6,7 @@
 		<Nullable>enable</Nullable>
 		<AllowUnsafeBlocks>True</AllowUnsafeBlocks>
 		<UseWindowsForms>true</UseWindowsForms>
-		<Version>0.7.4</Version>
+		<Version>0.7.5</Version>
 		<Authors>Mike Oliphant</Authors>
 		<Description>Stand-alone ASIO host for AudioPlugSharp plugins.</Description>
 		<PackageLicenseExpression>MIT</PackageLicenseExpression>

AudioPlugSharpJack/AudioPlugSharpJack.csproj

@@ -4,7 +4,7 @@
 		<TargetFramework>net8.0</TargetFramework>
 		<ImplicitUsings>enable</ImplicitUsings>
 		<Nullable>enable</Nullable>
-		<Version>0.7.4</Version>
+		<Version>0.7.5</Version>
 		<Authors>Mike Oliphant</Authors>
 		<Description>Jack Audio host for AudioPlugSharp plugins.</Description>
 		<PackageLicenseExpression>MIT</PackageLicenseExpression>

AudioPlugSharpJack/JackHost.cs

@@ -162,10 +162,12 @@ public void BeginEdit(int parameter)
 
         public void EndEdit(int parameter)
         {
+            PerformEdit(parameter, (Plugin as IAudioPluginEditor).Parameters[parameter].NormalizedEditValue);
         }
 
         public void PerformEdit(int parameter, double normalizedValue)
         {
+            (Plugin as IAudioPluginProcessor).Parameters[parameter].NormalizedProcessValue = normalizedValue;
         }
 
         public void ProcessAllEvents()

MidiExample/MidiExamplePlugin.cs

@@ -76,7 +76,7 @@ public override void Process()
         {
             base.Process();
 
-            linearGain = Math.Pow(10.0, 0.05 * gainParameter.ProcessValue);
+            linearGain = AudioPluginParameter.DbToLinear(gainParameter.ProcessValue);
 
             Span<double> outSamples = monoOutput.GetAudioBuffer(0);
 
@@ -102,7 +102,7 @@ public override void Process()
                     // If we need to update our gain paramter, get the sample-accurate interpolated value
                     if (needGainUpdate)
                     {
-                        linearGain = Math.Pow(10.0, 0.05 * gainParameter.GetInterpolatedProcessValue(i));
+                        linearGain = AudioPluginParameter.DbToLinear(gainParameter.GetInterpolatedProcessValue(i));
                     }
 
                     outSamples[i] = Math.Sin(((double)samplesSoFar * 2 * Math.PI * freq) / Host.SampleRate) * noteVolume * linearGain;

SimpleExample/SimpleExamplePlugin.cs

@@ -46,12 +46,12 @@ public override void Process()
         {
             base.Process();
 
-            // This will trigger all Midi note events and parameter changes that happend during this process window
+            // This will trigger all Midi note events and parameter changes that happened during this process window
             // For sample-accurate tracking, see the WPFExample or MidiExample plugins
             Host.ProcessAllEvents();
 
-            double gain = GetParameter("gain").ProcessValue;
-            float linearGain = (float)Math.Pow(10.0, 0.05 * gain);
+            double gainDb = GetParameter("gain").ProcessValue;
+            float linearGain = (float)AudioPluginParameter.DbToLinear(gainDb);
 
             ReadOnlySpan<float> inSamples = monoInput.GetAudioBuffer(0);
             Span<float> outSamples = monoOutput.GetAudioBuffer(0);

WPFExample/WPFExamplePlugin.cs

@@ -72,7 +72,7 @@ public override void Process()
             int currentSample = 0;
             int nextSample = 0;
 
-            double linearGain = Math.Pow(10.0, 0.05 * gainParameter.ProcessValue);
+            double linearGain = AudioPluginParameter.DbToLinear(gainParameter.ProcessValue);
             double pan = panParameter.ProcessValue;
 
             do
@@ -86,7 +86,7 @@ public override void Process()
                 {
                     if (needGainUpdate)
                     {
-                        linearGain = Math.Pow(10.0, 0.05 * gainParameter.GetInterpolatedProcessValue(i));
+                        linearGain = AudioPluginParameter.DbToLinear(gainParameter.GetInterpolatedProcessValue(i));
                     }
 
                     if (needPanUpdate)