Add initial code for AU plugin

Signed-off-by: falkTX <falktx@gmail.com>

3 files changed, 223 insertions, 4 deletions

diff --git a/distrho/DistrhoPluginMain.cpp b/distrho/DistrhoPluginMain.cpp
index ede06a44..52a01610 100644
--- a/distrho/DistrhoPluginMain.cpp
+++ b/distrho/DistrhoPluginMain.cpp
@@ -1,6 +1,6 @@
 /*
  * DISTRHO Plugin Framework (DPF)
- * Copyright (C) 2012-2016 Filipe Coelho <falktx@falktx.com>
+ * Copyright (C) 2012-2019 Filipe Coelho <falktx@falktx.com>
  *
  * Permission to use, copy, modify, and/or distribute this software for any purpose with
  * or without fee is hereby granted, provided that the above copyright notice and this
@@ -16,7 +16,9 @@
 
 #include "src/DistrhoPlugin.cpp"
 
-#if defined(DISTRHO_PLUGIN_TARGET_CARLA)
+#if defined(DISTRHO_PLUGIN_TARGET_AU)
+# include "src/DistrhoPluginAU.cpp"
+#elif defined(DISTRHO_PLUGIN_TARGET_CARLA)
 # include "src/DistrhoPluginCarla.cpp"
 #elif defined(DISTRHO_PLUGIN_TARGET_JACK)
 # include "src/DistrhoPluginJack.cpp"
diff --git a/distrho/DistrhoUIMain.cpp b/distrho/DistrhoUIMain.cpp
index f5c95db8..86b90910 100644
--- a/distrho/DistrhoUIMain.cpp
+++ b/distrho/DistrhoUIMain.cpp
@@ -1,6 +1,6 @@
 /*
  * DISTRHO Plugin Framework (DPF)
- * Copyright (C) 2012-2016 Filipe Coelho <falktx@falktx.com>
+ * Copyright (C) 2012-2019 Filipe Coelho <falktx@falktx.com>
  *
  * Permission to use, copy, modify, and/or distribute this software for any purpose with
  * or without fee is hereby granted, provided that the above copyright notice and this
@@ -16,7 +16,9 @@
 
 #include "src/DistrhoUI.cpp"
 
-#if defined(DISTRHO_PLUGIN_TARGET_CARLA)
+#if defined(DISTRHO_PLUGIN_TARGET_AU)
+// nothing
+#elif defined(DISTRHO_PLUGIN_TARGET_CARLA)
 // nothing
 #elif defined(DISTRHO_PLUGIN_TARGET_JACK)
 // nothing
diff --git a/distrho/src/DistrhoPluginAU.cpp b/distrho/src/DistrhoPluginAU.cpp
new file mode 100644
index 00000000..a3036844
--- /dev/null
+++ b/distrho/src/DistrhoPluginAU.cpp
@@ -0,0 +1,215 @@
+/*
+ * DISTRHO Plugin Framework (DPF)
+ * Copyright (C) 2012-2019 Filipe Coelho <falktx@falktx.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any purpose with
+ * or without fee is hereby granted, provided that the above copyright notice and this
+ * permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
+ * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "DistrhoPluginInternal.hpp"
+
+#include "CoreAudio106/AudioUnits/AUPublic/OtherBases/AUEffectBase.h"
+
+// -----------------------------------------------------------------------
+
+START_NAMESPACE_DISTRHO
+
+// #if ! DISTRHO_PLUGIN_WANT_MIDI_OUTPUT
+static const writeMidiFunc writeMidiCallback = nullptr;
+// #endif
+
+// -----------------------------------------------------------------------
+// AU Plugin
+
+class PluginAU : public AUEffectBase
+{
+public:
+    PluginAU(AudioUnit component)
+        : AUEffectBase(component),
+          fPlugin(this, writeMidiCallback)
+    {
+        CreateElements();
+
+        AUElement* const globals = Globals();
+        DISTRHO_SAFE_ASSERT_RETURN(globals != nullptr,);
+
+        if (const uint32_t paramCount = fPlugin.getParameterCount())
+        {
+            globals->UseIndexedParameters(paramCount);
+
+            for (uint32_t i=0; i < paramCount; ++i)
+                globals->SetParameter(i, fPlugin.getParameterValue(i));
+        }
+    }
+
+    ~PluginAU() override
+    {
+    }
+
+    AUKernelBase* NewKernel() override
+    {
+        return new dpfplugKernel(this);
+    }
+
+    OSStatus GetParameterValueStrings(AudioUnitScope inScope,
+                                      AudioUnitParameterID inParameterID,
+                                      CFArrayRef* outStrings) override
+    {
+        // TODO scalepoints support via kAudioUnitParameterFlag_ValuesHaveStrings
+        return kAudioUnitErr_InvalidProperty;
+    }
+
+    OSStatus GetParameterInfo(AudioUnitScope inScope,
+                              AudioUnitParameterID inParameterID,
+                              AudioUnitParameterInfo& outParameterInfo) override
+    {
+        DISTRHO_SAFE_ASSERT_RETURN(inScope == kAudioUnitScope_Global, kAudioUnitErr_InvalidParameter);
+
+        // Name
+        {
+            const String& name = fPlugin.getParameterUnit(inParameterID);
+
+            AUBase::FillInParameterName(outParameterInfo, name.buffer(), true);
+        }
+
+        // Hints
+        {
+            const uint32_t hints(fPlugin.getParameterHints(inParameterID));
+
+            outParameterInfo.flags = 0x0;
+
+            // other interesting bits:
+            // kAudioUnitParameterFlag_OmitFromPresets for outputs?
+            // kAudioUnitParameterFlag_MeterReadOnly for outputs?
+            // kAudioUnitParameterFlag_CanRamp for log?
+            // kAudioUnitParameterFlag_IsHighResolution ??
+
+            if (hints & kParameterIsOutput)
+                outParameterInfo.flags = kAudioUnitParameterFlag_IsReadable;
+            else
+                outParameterInfo.flags = kAudioUnitParameterFlag_IsWritable;
+
+            if ((hints & kParameterIsAutomable) == 0x0)
+                outParameterInfo.flags |= kAudioUnitParameterFlag_NonRealTime;
+
+            /* TODO: there doesn't seem to be a hint for this
+            if (hints & kParameterIsBoolean)
+            {}
+            else if (hints & kParameterIsInteger)
+            {}
+            */
+
+            if (hints & kParameterIsLogarithmic)
+                outParameterInfo.flags |= kAudioUnitParameterFlag_DisplayLogarithmic;
+        }
+
+        // Ranges
+        {
+            const ParameterRanges& ranges(fPlugin.getParameterRanges(inParameterID));
+
+            outParameterInfo.defaultValue = ranges.def;
+            outParameterInfo.minValue = ranges.min;
+            outParameterInfo.maxValue = ranges.max;
+        }
+
+        // Unit
+        {
+            const String& unit = fPlugin.getParameterUnit(inParameterID);
+
+            // TODO: map all AU unit types
+
+            if (unit == "dB")
+            {
+                outParameterInfo.unit = kAudioUnitParameterUnit_LinearGain;
+            }
+            else
+            {
+                outParameterInfo.unit = kAudioUnitParameterUnit_CustomUnit;
+                outParameterInfo.unitName = unit.buffer();
+            }
+        }
+
+        return noErr;
+    }
+
+    OSStatus GetPropertyInfo(AudioUnitPropertyID inID,
+                             AudioUnitScope inScope,
+                             AudioUnitElement inElement,
+                             UInt32& outDataSize,
+                             Boolean& outWritable) override
+    {
+        return AUEffectBase::GetPropertyInfo(inID, inScope, inElement, outDataSize, outWritable);
+    }
+
+    OSStatus GetProperty(AudioUnitPropertyID inID,
+                         AudioUnitScope inScope,
+                         AudioUnitElement inElement,
+                         void* outData) override
+    {
+        return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
+    }
+
+    bool SupportsTail() override
+    {
+        return false;
+    }
+
+    OSStatus Version() override
+    {
+        return fPlugin.getVersion();
+    }
+
+    // -------------------------------------------------------------------
+
+private:
+    PluginExporter fPlugin;
+
+    // most of the real work happens here
+    class PluginKernel : public AUKernelBase
+    {
+    public:
+        PluginKernel(AUEffectBase* const inAudioUnit, PluginExporter& plugin)
+            : AUKernelBase(inAudioUnit),
+              fPlugin(plugin) {}
+
+        // *Required* overides for the process method for this effect
+        // processes one channel of interleaved samples
+        void Process(const Float32* const inSourceP,
+                     Float32* const inDestP,
+                     UInt32 inFramesToProcess,
+                     UInt32 inNumChannels,
+                     bool& ioSilence)
+        {
+            DISTRHO_SAFE_ASSERT_RETURN(inNumChannels == DISTRHO_PLUGIN_NUM_INPUTS,);
+
+            fPlugin.run(inSourceP, inDestP, inFramesToProcess);
+        }
+
+        void Reset() override
+        {
+        }
+
+    private:
+        PluginExporter& fPlugin;
+
+        DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(PluginKernel)
+    };
+
+    DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(PluginAU)
+};
+
+END_NAMESPACE_DISTRHO
+
+// -----------------------------------------------------------------------
+
+COMPONENT_ENTRY(DISTRHO_NAMESPACE::PluginAU)
+
+// -----------------------------------------------------------------------