Initial release

engine/vendor/vst3sdk/public.sdk/source/vst/interappaudio/AudioIO.h

@@ -0,0 +1,150 @@
+//-----------------------------------------------------------------------------
+// Project     : VST SDK
+//
+// Category    : Helpers
+// Filename    : public.sdk/source/vst/interappaudio/AudioIO.h
+// Created by  : Steinberg, 08/2013.
+// Description : VST 3 InterAppAudio
+// Flags       : clang-format SMTGSequencer
+//
+//-----------------------------------------------------------------------------
+// This file is part of a Steinberg SDK. It is subject to the license terms
+// in the LICENSE file found in the top-level directory of this distribution
+// and at www.steinberg.net/sdklicenses.
+// No part of the SDK, including this file, may be copied, modified, propagated,
+// or distributed except according to the terms contained in the LICENSE file.
+//-----------------------------------------------------------------------------
+
+#pragma once
+
+/// \cond ignore
+
+#include "pluginterfaces/base/funknown.h"
+#include "pluginterfaces/vst/vsttypes.h"
+#include <AudioToolbox/AudioToolbox.h>
+#include <AudioUnit/AUComponent.h>
+#include <vector>
+
+#ifndef __OBJC__
+struct UIImage;
+struct NSString;
+#endif
+
+namespace Steinberg {
+namespace Vst {
+namespace InterAppAudio {
+
+class AudioIO;
+
+//------------------------------------------------------------------------
+class IMidiProcessor
+{
+public:
+	virtual void onMIDIEvent (UInt32 status, UInt32 data1, UInt32 data2, UInt32 sampleOffset,
+	                          bool withinRealtimeThread) = 0;
+};
+
+//------------------------------------------------------------------------
+class IAudioIOProcessor : public IMidiProcessor
+{
+public:
+	virtual void willStartAudio (AudioIO* audioIO) = 0;
+	virtual void didStopAudio (AudioIO* audioIO) = 0;
+
+	virtual void process (const AudioTimeStamp* timeStamp, UInt32 busNumber, UInt32 numFrames,
+	                      AudioBufferList* ioData, bool& outputIsSilence, AudioIO* audioIO) = 0;
+};
+
+//------------------------------------------------------------------------
+class AudioIO
+{
+public:
+	static AudioIO* instance ();
+
+	tresult init (OSType type, OSType subType, OSType manufacturer, CFStringRef name);
+
+	bool switchToHost ();
+	bool sendRemoteControlEvent (AudioUnitRemoteControlEvent event);
+	UIImage* getHostIcon ();
+
+	tresult start ();
+	tresult stop ();
+
+	tresult addProcessor (IAudioIOProcessor* processor);
+	tresult removeProcessor (IAudioIOProcessor* processor);
+
+	// accessors
+	AudioUnit getRemoteIO () const { return remoteIO; }
+	SampleRate getSampleRate () const { return sampleRate; }
+	bool getInterAppAudioConnected () const { return interAppAudioConnected; }
+
+	// host context information
+	bool getBeatAndTempo (Float64& beat, Float64& tempo);
+	bool getMusicalTimeLocation (UInt32& deltaSampleOffset, Float32& timeSigNumerator,
+	                             UInt32& timeSigDenominator, Float64& downBeat);
+	bool getTransportState (Boolean& isPlaying, Boolean& isRecording,
+	                        Boolean& transportStateChanged, Float64& sampleInTimeLine,
+	                        Boolean& isCycling, Float64& cycleStartBeat, Float64& cycleEndBeat);
+
+	void setStaticFallbackTempo (Float64 tempo) { staticTempo = tempo; }
+	Float64 getStaticFallbackTempo () const { return staticTempo; }
+
+	static NSString* kConnectionStateChange;
+//------------------------------------------------------------------------
+protected:
+	AudioIO ();
+	~AudioIO ();
+
+	static OSStatus inputCallbackStatic (void* inRefCon, AudioUnitRenderActionFlags* ioActionFlags,
+	                                     const AudioTimeStamp* inTimeStamp, UInt32 inBusNumber,
+	                                     UInt32 inNumberFrames, AudioBufferList* ioData);
+	static OSStatus renderCallbackStatic (void* inRefCon, AudioUnitRenderActionFlags* ioActionFlags,
+	                                      const AudioTimeStamp* inTimeStamp, UInt32 inBusNumber,
+	                                      UInt32 inNumberFrames, AudioBufferList* ioData);
+	static void propertyChangeStatic (void* inRefCon, AudioUnit inUnit, AudioUnitPropertyID inID,
+	                                  AudioUnitScope inScope, AudioUnitElement inElement);
+	static void midiEventCallbackStatic (void* inRefCon, UInt32 inStatus, UInt32 inData1,
+	                                     UInt32 inData2, UInt32 inOffsetSampleFrame);
+
+	OSStatus inputCallback (AudioUnitRenderActionFlags* ioActionFlags,
+	                        const AudioTimeStamp* inTimeStamp, UInt32 inBusNumber,
+	                        UInt32 inNumberFrames, AudioBufferList* ioData);
+	OSStatus renderCallback (AudioUnitRenderActionFlags* ioActionFlags,
+	                         const AudioTimeStamp* inTimeStamp, UInt32 inBusNumber,
+	                         UInt32 inNumberFrames, AudioBufferList* ioData);
+	void midiEventCallback (UInt32 inStatus, UInt32 inData1, UInt32 inData2,
+	                        UInt32 inOffsetSampleFrame);
+
+	void remoteIOPropertyChanged (AudioUnitPropertyID inID, AudioUnitScope inScope,
+	                              AudioUnitElement inElement);
+
+	void setAudioSessionActive (bool state);
+	tresult setupRemoteIO (OSType type);
+	tresult setupAUGraph (OSType type);
+	void updateInterAppAudioConnectionState ();
+
+	AudioUnit remoteIO {nullptr};
+	AUGraph graph {nullptr};
+	AudioBufferList* ioBufferList {nullptr};
+	HostCallbackInfo hostCallback {};
+	UInt32 maxFrames {4096};
+	Float64 staticTempo {120.};
+	SampleRate sampleRate;
+	bool interAppAudioConnected {false};
+	std::vector<IAudioIOProcessor*> audioProcessors;
+
+	enum InternalState
+	{
+		kUninitialized,
+		kInitialized,
+		kStarted,
+	};
+	InternalState internalState {kUninitialized};
+};
+
+//------------------------------------------------------------------------
+} // namespace InterAppAudio
+} // namespace Vst
+} // namespace Steinberg
+
+/// \endcond