Version 0.9

Added: Filter type "IIR", which allows to specify a user-defined IIR filter of arbitrary order with custom coefficients.
Improved: For playback devices, the APO is now installed both as GFX (post-mix) and LFX (pre-mix) APO. Normally the filtering happens in GFX, but the command "Stage" allows to select LFX to apply effects based on the number of input channels.
Added: Expression language. The commands "If", "ElseIf", "Else", "EndIf", "Eval" and inline expressions allow to change the filter behaviour based on runtime conditions.
Added: Command "Copy", which copies audio data between channels.
Added: Command "Delay", which delays the audio on the currently selected channels.
Improved: Configuration files are now locked exclusively for writing while reading them.
Improved: There is now a transition (10 ms) from old to new configuration after loading.
Improved: Substantial internal restructuring to improve extensibility and maintainability. Filtering commands now work exactly in the order they were specified.
Fixed: When the microphone input was in stereo but the application requested a mono stream, the audio was heavily distorted.
Fixed: The sine sweep generated by the Benchmark application had floating-point precision issues leading to severe artifacts when certain filters were applied.

EqualizerAPO.vcxproj

@@ -66,22 +66,22 @@
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <LinkIncremental>true</LinkIncremental>
-    <IncludePath>$(IncludePath);$(DDK_PATH)\inc\api</IncludePath>
+    <IncludePath>$(SolutionDir);$(IncludePath);$(DDK_PATH)\inc\api</IncludePath>
     <LibraryPath>$(LibraryPath);$(DDK_PATH)\lib\win7\i386</LibraryPath>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
     <LinkIncremental>true</LinkIncremental>
-    <IncludePath>$(IncludePath);$(DDK_PATH)\inc\api</IncludePath>
+    <IncludePath>$(SolutionDir);$(IncludePath);$(DDK_PATH)\inc\api</IncludePath>
     <LibraryPath>$(LibraryPath);$(DDK_PATH)\lib\win7\amd64</LibraryPath>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <LinkIncremental>false</LinkIncremental>
-    <IncludePath>$(IncludePath);$(DDK_PATH)\inc\api</IncludePath>
+    <IncludePath>$(SolutionDir);$(IncludePath);$(DDK_PATH)\inc\api</IncludePath>
     <LibraryPath>$(LibraryPath);$(DDK_PATH)\lib\win7\i386</LibraryPath>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <LinkIncremental>false</LinkIncremental>
-    <IncludePath>$(IncludePath);$(DDK_PATH)\inc\api</IncludePath>
+    <IncludePath>$(SolutionDir);$(IncludePath);$(DDK_PATH)\inc\api</IncludePath>
     <LibraryPath>$(LibraryPath);$(DDK_PATH)\lib\win7\amd64</LibraryPath>
   </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
@@ -89,12 +89,12 @@
       <PrecompiledHeader>NotUsing</PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
       <Optimization>Disabled</Optimization>
-      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;EQUALIZERAPO_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;USE_WINDDK;_DEBUG;_WINDOWS;_USRDLL;EQUALIZERAPO_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
       <GenerateDebugInformation>true</GenerateDebugInformation>
-      <AdditionalDependencies>version.lib;wmcodecdspuuid.lib;AudioBaseProcessingObject.lib;audiomediatypecrt.lib;Shlwapi.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>muparserxd.lib;audioeng.lib;version.lib;wmcodecdspuuid.lib;AudioBaseProcessingObject.lib;audiomediatypecrt.lib;Shlwapi.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <ModuleDefinitionFile>EqualizerAPO.def</ModuleDefinitionFile>
     </Link>
     <Midl>
@@ -106,12 +106,12 @@
       <PrecompiledHeader>NotUsing</PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
       <Optimization>Disabled</Optimization>
-      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;EQUALIZERAPO_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;USE_WINDDK;_DEBUG;_WINDOWS;_USRDLL;EQUALIZERAPO_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
       <GenerateDebugInformation>true</GenerateDebugInformation>
-      <AdditionalDependencies>version.lib;wmcodecdspuuid.lib;AudioBaseProcessingObject.lib;audiomediatypecrt.lib;Shlwapi.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>muparserxd.lib;audioeng.lib;version.lib;wmcodecdspuuid.lib;AudioBaseProcessingObject.lib;audiomediatypecrt.lib;Shlwapi.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <ModuleDefinitionFile>EqualizerAPO.def</ModuleDefinitionFile>
     </Link>
     <Midl>
@@ -125,7 +125,7 @@
       <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;EQUALIZERAPO_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;USE_WINDDK;NDEBUG;_WINDOWS;_USRDLL;EQUALIZERAPO_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <FloatingPointModel>Fast</FloatingPointModel>
     </ClCompile>
     <Link>
@@ -133,7 +133,7 @@
       <GenerateDebugInformation>true</GenerateDebugInformation>
       <EnableCOMDATFolding>true</EnableCOMDATFolding>
       <OptimizeReferences>true</OptimizeReferences>
-      <AdditionalDependencies>version.lib;wmcodecdspuuid.lib;AudioBaseProcessingObject.lib;audiomediatypecrt.lib;Shlwapi.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>muparserx.lib;audioeng.lib;version.lib;wmcodecdspuuid.lib;AudioBaseProcessingObject.lib;audiomediatypecrt.lib;Shlwapi.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <ModuleDefinitionFile>EqualizerAPO.def</ModuleDefinitionFile>
     </Link>
   </ItemDefinitionGroup>
@@ -144,7 +144,7 @@
       <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;EQUALIZERAPO_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;USE_WINDDK;NDEBUG;_WINDOWS;_USRDLL;EQUALIZERAPO_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <FloatingPointModel>Fast</FloatingPointModel>
     </ClCompile>
     <Link>
@@ -152,32 +152,80 @@
       <GenerateDebugInformation>true</GenerateDebugInformation>
       <EnableCOMDATFolding>true</EnableCOMDATFolding>
       <OptimizeReferences>true</OptimizeReferences>
-      <AdditionalDependencies>version.lib;wmcodecdspuuid.lib;AudioBaseProcessingObject.lib;audiomediatypecrt.lib;Shlwapi.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>muparserx.lib;audioeng.lib;version.lib;wmcodecdspuuid.lib;AudioBaseProcessingObject.lib;audiomediatypecrt.lib;Shlwapi.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <ModuleDefinitionFile>EqualizerAPO.def</ModuleDefinitionFile>
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
-    <ClInclude Include="BiQuad.h" />
     <ClInclude Include="ClassFactory.h" />
     <ClInclude Include="DeviceAPOInfo.h" />
     <ClInclude Include="EqualizerAPO.h" />
-    <ClInclude Include="LogHelper.h" />
-    <ClInclude Include="ParametricEQ.h" />
-    <ClInclude Include="RegistryHelper.h" />
+    <ClInclude Include="FilterConfiguration.h" />
+    <ClInclude Include="FilterEngine.h" />
+    <ClInclude Include="filters\BiQuad.h" />
+    <ClInclude Include="filters\BiQuadFilter.h" />
+    <ClInclude Include="filters\BiQuadFilterFactory.h" />
+    <ClInclude Include="filters\ChannelFilter.h" />
+    <ClInclude Include="filters\ChannelFilterFactory.h" />
+    <ClInclude Include="filters\CopyFilter.h" />
+    <ClInclude Include="filters\CopyFilterFactory.h" />
+    <ClInclude Include="filters\DelayFilter.h" />
+    <ClInclude Include="filters\DelayFilterFactory.h" />
+    <ClInclude Include="filters\DeviceFilterFactory.h" />
+    <ClInclude Include="filters\ExpressionFilterFactory.h" />
+    <ClInclude Include="filters\IfFilterFactory.h" />
+    <ClInclude Include="filters\IIRFilter.h" />
+    <ClInclude Include="filters\IIRFilterFactory.h" />
+    <ClInclude Include="filters\IncludeFilterFactory.h" />
+    <ClInclude Include="filters\PreampFilter.h" />
+    <ClInclude Include="filters\PreampFilterFactory.h" />
+    <ClInclude Include="filters\StageFilterFactory.h" />
+    <ClInclude Include="helpers\LogHelper.h" />
+    <ClInclude Include="helpers\MemoryHelper.h" />
+    <ClInclude Include="helpers\PrecisionTimer.h" />
+    <ClInclude Include="helpers\RegistryHelper.h" />
+    <ClInclude Include="helpers\StringHelper.h" />
+    <ClInclude Include="IFilter.h" />
+    <ClInclude Include="IFilterFactory.h" />
+    <ClInclude Include="parser\RegexFunctions.h" />
+    <ClInclude Include="parser\RegistryFunctions.h" />
+    <ClInclude Include="parser\StringOperators.h" />
     <ClInclude Include="resource.h" />
-    <ClInclude Include="StringHelper.h" />
     <ClInclude Include="version.h" />
   </ItemGroup>
   <ItemGroup>
-    <ClCompile Include="BiQuad.cpp" />
     <ClCompile Include="ClassFactory.cpp" />
     <ClCompile Include="DeviceAPOInfo.cpp" />
     <ClCompile Include="DllMain.cpp" />
     <ClCompile Include="EqualizerAPO.cpp" />
-    <ClCompile Include="LogHelper.cpp" />
-    <ClCompile Include="ParametricEQ.cpp" />
-    <ClCompile Include="RegistryHelper.cpp" />
-    <ClCompile Include="StringHelper.cpp" />
+    <ClCompile Include="FilterConfiguration.cpp" />
+    <ClCompile Include="FilterEngine.cpp" />
+    <ClCompile Include="filters\BiQuad.cpp" />
+    <ClCompile Include="filters\BiQuadFilter.cpp" />
+    <ClCompile Include="filters\BiQuadFilterFactory.cpp" />
+    <ClCompile Include="filters\ChannelFilter.cpp" />
+    <ClCompile Include="filters\ChannelFilterFactory.cpp" />
+    <ClCompile Include="filters\CopyFilter.cpp" />
+    <ClCompile Include="filters\CopyFilterFactory.cpp" />
+    <ClCompile Include="filters\DelayFilter.cpp" />
+    <ClCompile Include="filters\DelayFilterFactory.cpp" />
+    <ClCompile Include="filters\DeviceFilterFactory.cpp" />
+    <ClCompile Include="filters\ExpressionFilterFactory.cpp" />
+    <ClCompile Include="filters\IfFilterFactory.cpp" />
+    <ClCompile Include="filters\IIRFilter.cpp" />
+    <ClCompile Include="filters\IIRFilterFactory.cpp" />
+    <ClCompile Include="filters\IncludeFilterFactory.cpp" />
+    <ClCompile Include="filters\PreampFilter.cpp" />
+    <ClCompile Include="filters\PreampFilterFactory.cpp" />
+    <ClCompile Include="filters\StageFilterFactory.cpp" />
+    <ClCompile Include="helpers\LogHelper.cpp" />
+    <ClCompile Include="helpers\MemoryHelper.cpp" />
+    <ClCompile Include="helpers\RegistryHelper.cpp" />
+    <ClCompile Include="helpers\StringHelper.cpp" />
+    <ClCompile Include="IFilter.cpp" />
+    <ClCompile Include="parser\RegexFunctions.cpp" />
+    <ClCompile Include="parser\RegistryFunctions.cpp" />
+    <ClCompile Include="parser\StringOperators.cpp" />
   </ItemGroup>
   <ItemGroup>
     <None Include="EqualizerAPO.def" />