/*  Copyright © 2007 Apple Inc. All Rights Reserved.

    Disclaimer: IMPORTANT:  This Apple software is supplied to you by 

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            text and disclaimers in all such redistributions of the Apple Software. 

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            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

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*/

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

//  DebugAU.cpp

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

#include "AUBase.h"

#include "DebugAUVersion.h"

#include <AudioUnit/AudioUnitProperties.h>

#include "AUDebugDispatcher.h"

static const AUChannelInfo sChannels[1] = { {-1, -1} };

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

#pragma mark ____DebugAU

/*

    virtual OSStatus            PrepareInstrument(MusicDeviceInstrumentID inInstrument) = 0;

    virtual OSStatus            ReleaseInstrument(MusicDeviceInstrumentID inInstrument) = 0;

    virtual OSStatus            StartNote(      MusicDeviceInstrumentID     inInstrument, 

                                                MusicDeviceGroupID          inGroupID, 

                                                NoteInstanceID              &outNoteInstanceID, 

                                                UInt32                      inOffsetSampleFrame, 

                                                const MusicDeviceNoteParams &inParams) = 0;

    virtual OSStatus            StopNote(       MusicDeviceGroupID          inGroupID, 

                                                NoteInstanceID              inNoteInstanceID, 

                                                UInt32                      inOffsetSampleFrame) = 0;

*/

class DebugAU : public AUBase

{

public:

                                DebugAU(AudioUnit component);

    virtual                     ~DebugAU () 

                                { 

                                    delete mDebugDispatcher; 

                                }    

    virtual bool                StreamFormatWritable(   AudioUnitScope                  scope,

                                                        AudioUnitElement                element)

                                {

                                    return IsInitialized() ? false : element == 0;

                                }

    virtual bool                SupportsTail () 

                                { 

                                    return true; 

                                }

    virtual UInt32              SupportedNumChannels (const AUChannelInfo**                 outInfo)

                                {

                                    if (outInfo) *outInfo = sChannels;

                                    return sizeof (sChannels) / sizeof (AUChannelInfo);

                                }

    virtual OSStatus            Initialize();

    virtual OSStatus            Version() 

                                { 

                                    return kDebugAUVersion; 

                                }

    virtual OSStatus    Render( AudioUnitRenderActionFlags  & ioActionFlags,

                                        const AudioTimeStamp        & inTimeStamp,

                                        UInt32                      nFrames);

};

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

COMPONENT_ENTRY(DebugAU)

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

//  DebugAU::DebugAU

//

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

DebugAU::DebugAU(AudioUnit component)

    : AUBase(component, 1, 1)

{

    mDebugDispatcher = new AUDebugDispatcher (this);

}

OSStatus            DebugAU::Initialize()

{

        // get our current numChannels for input and output

    UInt32 auNumInputChan = GetInput(0)->GetStreamFormat().mChannelsPerFrame;

    UInt32 auNumOutputChan = GetOutput(0)->GetStreamFormat().mChannelsPerFrame;

    if (auNumInputChan != auNumOutputChan) 

        return kAudioUnitErr_FormatNotSupported;

    return noErr;

}

// we can use render here as we know that we're only rendering on bus zero.

OSStatus    DebugAU::Render(    AudioUnitRenderActionFlags  & ioActionFlags,

                                        const AudioTimeStamp        & inTimeStamp,

                                        UInt32                      nFrames)

{

    if (!HasInput(0))

        return kAudioUnitErr_NoConnection;

    AUInputElement *theInput = GetInput(0);

    OSStatus result = theInput->PullInput(ioActionFlags, inTimeStamp, 0 /* element */, nFrames);

    if (result == noErr)

    {

        AUOutputElement *theOutput = GetOutput(0);  // throws if error

        theInput->CopyBufferContentsTo (theOutput->GetBufferList());

    }

    return result;

}