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+/*
+     File: AUInputFormatConverter.h
+ Abstract: Part of CoreAudio Utility Classes
+  Version: 1.1
+ 
+ Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple
+ Inc. ("Apple") in consideration of your agreement to the following
+ terms, and your use, installation, modification or redistribution of
+ this Apple software constitutes acceptance of these terms.  If you do
+ not agree with these terms, please do not use, install, modify or
+ redistribute this Apple software.
+ 
+ In consideration of your agreement to abide by the following terms, and
+ subject to these terms, Apple grants you a personal, non-exclusive
+ license, under Apple's copyrights in this original Apple software (the
+ "Apple Software"), to use, reproduce, modify and redistribute the Apple
+ Software, with or without modifications, in source and/or binary forms;
+ provided that if you redistribute the Apple Software in its entirety and
+ without modifications, you must retain this notice and the following
+ text and disclaimers in all such redistributions of the Apple Software.
+ Neither the name, trademarks, service marks or logos of Apple Inc. may
+ be used to endorse or promote products derived from the Apple Software
+ without specific prior written permission from Apple.  Except as
+ expressly stated in this notice, no other rights or licenses, express or
+ implied, are granted by Apple herein, including but not limited to any
+ patent rights that may be infringed by your derivative works or by other
+ works in which the Apple Software may be incorporated.
+ 
+ The Apple Software is provided by Apple on an "AS IS" basis.  APPLE
+ MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
+ THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
+ FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
+ OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
+ 
+ IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
+ OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
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+ AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
+ STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
+ POSSIBILITY OF SUCH DAMAGE.
+ 
+ Copyright (C) 2014 Apple Inc. All Rights Reserved.
+ 
+*/
+#ifndef __AUInputFormatConverter_h__
+#define __AUInputFormatConverter_h__
+
+#include "FormatConverterClient.h"
+#include "AUTimestampGenerator.h"
+
+// ____________________________________________________________________________
+// AUInputFormatConverter
+//
+// Subclass of FormatConverterClient that applies a format conversion
+// to an input of an AudioUnit.
+	/*! @class AUInputFormatConverter */
+class AUInputFormatConverter : public FormatConverterClient {
+public:
+	/*! @ctor AUInputFormatConverter */
+	AUInputFormatConverter(AUBase *hostAU, int inputBus) :
+		mHost(hostAU),
+		mHostBus(inputBus),
+		mPreviousSilentFrames(0x1000)
+	{
+#if DEBUG
+		mTimestampGenerator.mVerbosity = 0;
+		strcpy(mTimestampGenerator.mDebugName, "AUConverter");
+#endif
+	}
+	
+	// need to subsequently call Initialize, with the desired formats
+	
+	/*! @dtor ~AUInputFormatConverter */
+	~AUInputFormatConverter()
+	{
+	}
+	
+	virtual OSStatus Initialize(const AudioStreamBasicDescription &src, const AudioStreamBasicDescription &dest)
+	{
+		OSStatus err = FormatConverterClient::Initialize(src, dest);
+		if (err) return err;
+		mIsPCMToPCM = (src.mFormatID == kAudioFormatLinearPCM) && (dest.mFormatID == kAudioFormatLinearPCM);
+		mHasSRC = (fnonzero(src.mSampleRate) && fnonzero(dest.mSampleRate) && fnotequal(src.mSampleRate, dest.mSampleRate));
+		return ca_noErr;
+	}
+
+	virtual OSStatus	Reset()
+	{
+		mPreviousSilentFrames = 0x1000;
+		mTimestampGenerator.Reset();
+		return FormatConverterClient::Reset();
+	}
+	
+	void	SetStartInputTimeAtZero(bool b)
+	{
+		mTimestampGenerator.SetStartInputAtZero(b);
+	}
+
+	/*! @method FillComplexBuffer */
+	OSStatus	AUFillComplexBuffer(const AudioTimeStamp &				inTimeStamp,
+									UInt32 &							ioOutputDataPacketSize,
+									AudioBufferList &					outOutputData,
+									AudioStreamPacketDescription*		outPacketDescription,
+									bool&								outSilence)
+	{
+		mTimestampGenerator.AddOutputTime(inTimeStamp, ioOutputDataPacketSize, mOutputFormat.mSampleRate);
+		mSilentOutput = true;
+		OSStatus err = FillComplexBuffer(ioOutputDataPacketSize, outOutputData, outPacketDescription);
+		if (mSilentOutput) {
+			if (!mIsPCMToPCM || (mHasSRC && mPreviousSilentFrames < 32))
+				mSilentOutput = false;
+			mPreviousSilentFrames += ioOutputDataPacketSize;
+ 		} else
+			mPreviousSilentFrames = 0;
+		outSilence = mSilentOutput;
+		return err;
+	}
+
+	/*! @method FormatConverterInputProc */
+	virtual OSStatus	FormatConverterInputProc(	
+								UInt32 &						ioNumberDataPackets,
+								AudioBufferList &				ioData,
+								AudioStreamPacketDescription**	outDataPacketDescription)
+	{
+		OSStatus err = ca_noErr;
+		
+		AudioUnitRenderActionFlags actionFlags = 0;
+		AUInputElement *input = mHost->GetInput(mHostBus);
+		*ioNumberDataPackets = std::min(*ioNumberDataPackets, This->mHost->GetMaxFramesPerSlice());
+		const AudioTimeStamp &inputTime = mTimestampGenerator.GenerateInputTime(ioNumberDataPackets, mInputFormat.mSampleRate);
+		err = input->PullInput(actionFlags, inputTime, mHostBus, ioNumberDataPackets);
+		if (!err) {
+			input->CopyBufferListTo(ioData);
+			if (!(actionFlags & kAudioUnitRenderAction_OutputIsSilence))
+				mSilentOutput = false;
+		}
+		return err;
+	}
+
+protected:
+	/*! @var mHost */
+	AUBase *				mHost;
+	/*! @var mHostBus */
+	int						mHostBus;
+	
+	AUTimestampGenerator	mTimestampGenerator;
+	bool					mIsPCMToPCM;
+	bool					mHasSRC;
+	bool					mSilentOutput;
+	UInt32					mPreviousSilentFrames;
+};
+
+#endif // __AUInputFormatConverter_h__