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//==================================================================================================

//  Includes

//==================================================================================================

//  Local Includes

#include "ARDebug.h"

#include "AREngine.h"

#include "PCMBlitterLib.h"

//  System Includes

#include <IOKit/IOLib.h>

#include <IOKit/audio/IOAudioStream.h>

//==================================================================================================

//  ARClip

//==================================================================================================

IOReturn AREngine::clipOutputSamples(const void* inMixBuffer, void* outTargetBuffer, UInt32 inFirstFrame, UInt32 inNumberFrames, const IOAudioStreamFormat* inFormat, IOAudioStream* /*inStream*/)

{

    //  figure out what sort of blit we need to do

    if((inFormat->fSampleFormat == kIOAudioStreamSampleFormatLinearPCM) && inFormat->fIsMixable)

    {

        //  it's mixable linear PCM, which means we will be calling a blitter, which works in samples not frames

        Float32* theMixBuffer = (Float32*)inMixBuffer;

        UInt32 theFirstSample = inFirstFrame * inFormat->fNumChannels;

        UInt32 theNumberSamples = inNumberFrames * inFormat->fNumChannels;

        if(inFormat->fNumericRepresentation == kIOAudioStreamNumericRepresentationSignedInt)

        {

            //  it's some kind of signed integer, which we handle as some kind of even byte length

            bool nativeEndianInts;

            #if TARGET_RT_BIG_ENDIAN

                nativeEndianInts = (inFormat->fByteOrder == kIOAudioStreamByteOrderBigEndian);

            #else

                nativeEndianInts = (inFormat->fByteOrder == kIOAudioStreamByteOrderLittleEndian);

            #endif

            switch(inFormat->fBitWidth)

            {

                case 8:

                    {

                        DebugMessage("AREngine::clipOutputSamples: can't handle signed integers with a bit width of 8 at the moment");

                    }

                    break;

                case 16:

                    {

                        SInt16* theTargetBuffer = (SInt16*)outTargetBuffer;

                        if (nativeEndianInts)

                            Float32ToNativeInt16(&(theMixBuffer[theFirstSample]), &(theTargetBuffer[theFirstSample]), theNumberSamples);

                        else

                            Float32ToSwapInt16(&(theMixBuffer[theFirstSample]), &(theTargetBuffer[theFirstSample]), theNumberSamples);

                    }

                    break;

                case 24:

                    {

                        UInt8* theTargetBuffer = (UInt8*)outTargetBuffer;

                        if (nativeEndianInts)

                            Float32ToNativeInt24(&(theMixBuffer[theFirstSample]), &(theTargetBuffer[3*theFirstSample]), theNumberSamples);

                        else

                            Float32ToSwapInt24(&(theMixBuffer[theFirstSample]), &(theTargetBuffer[3*theFirstSample]), theNumberSamples);

                    }

                    break;

                case 32:

                    {

                        SInt32* theTargetBuffer = (SInt32*)outTargetBuffer;

                        if (nativeEndianInts)

                            Float32ToNativeInt32(&(theMixBuffer[theFirstSample]), &(theTargetBuffer[theFirstSample]), theNumberSamples);

                        else

                            Float32ToSwapInt32(&(theMixBuffer[theFirstSample]), &(theTargetBuffer[theFirstSample]), theNumberSamples);

                    }

                    break;

                default:

                    DebugMessageN1("AREngine::clipOutputSamples: can't handle signed integers with a bit width of %d", inFormat->fBitWidth);

                    break;

            }

        }

        else if(inFormat->fNumericRepresentation == kIOAudioStreamNumericRepresentationIEEE754Float)

        {

            //  it is some kind of floating point format

        #if TARGET_RT_BIG_ENDIAN

            if((inFormat->fBitWidth == 32) && (inFormat->fBitDepth == 32) && (inFormat->fByteOrder == kIOAudioStreamByteOrderBigEndian))

        #else

            if((inFormat->fBitWidth == 32) && (inFormat->fBitDepth == 32) && (inFormat->fByteOrder == kIOAudioStreamByteOrderLittleEndian))

        #endif

            {

                //  it's Float32, so we are just going to copy the data

                Float32* theTargetBuffer = (Float32*)outTargetBuffer;

                memcpy(&(theTargetBuffer[theFirstSample]), &(theMixBuffer[theFirstSample]), theNumberSamples * sizeof(Float32));

            }

            else

            {

                DebugMessageN2("AREngine::clipOutputSamples: can't handle floats with a bit width of %d, bit depth of %d, and/or the given byte order", inFormat->fBitWidth, inFormat->fBitDepth);

            }

        }

    }

    else

    {

        //  it's not linear PCM or it's not mixable, so just copy the data into the target buffer

        SInt8* theMixBuffer = (SInt8*)inMixBuffer;

        SInt8* theTargetBuffer = (SInt8*)outTargetBuffer;

        UInt32 theFirstByte = inFirstFrame * (inFormat->fBitWidth / 8) * inFormat->fNumChannels;

        UInt32 theNumberBytes = inNumberFrames * (inFormat->fBitWidth / 8) * inFormat->fNumChannels;

        memcpy(&(theTargetBuffer[theFirstByte]), &(theMixBuffer[theFirstByte]), theNumberBytes);

    }

    return kIOReturnSuccess;

}

IOReturn AREngine::convertInputSamples(const void* inSourceBuffer, void* outTargetBuffer, UInt32 inFirstFrame, UInt32 inNumberFrames, const IOAudioStreamFormat* inFormat, IOAudioStream* /*inStream*/)

{

    //  figure out what sort of blit we need to do

    if((inFormat->fSampleFormat == kIOAudioStreamSampleFormatLinearPCM) && inFormat->fIsMixable)

    {

        //  it's linear PCM, which means the target is Float32 and we will be calling a blitter, which works in samples not frames

        Float32* theTargetBuffer = (Float32*)outTargetBuffer;

        UInt32 theFirstSample = inFirstFrame * inFormat->fNumChannels;

        UInt32 theNumberSamples = inNumberFrames * inFormat->fNumChannels;

        if(inFormat->fNumericRepresentation == kIOAudioStreamNumericRepresentationSignedInt)

        {

            //  it's some kind of signed integer, which we handle as some kind of even byte length

            bool nativeEndianInts;

            #if TARGET_RT_BIG_ENDIAN

                nativeEndianInts = (inFormat->fByteOrder == kIOAudioStreamByteOrderBigEndian);

            #else

                nativeEndianInts = (inFormat->fByteOrder == kIOAudioStreamByteOrderLittleEndian);

            #endif

            switch(inFormat->fBitWidth)

            {

                case 8:

                    {

                        DebugMessage("AREngine::convertInputSamples: can't handle signed integers with a bit width of 8 at the moment");

                    }

                    break;

                case 16:

                    {

                        SInt16* theSourceBuffer = (SInt16*)inSourceBuffer;

                        if (nativeEndianInts)

                            NativeInt16ToFloat32(&(theSourceBuffer[theFirstSample]), theTargetBuffer, theNumberSamples);

                        else

                            SwapInt16ToFloat32(&(theSourceBuffer[theFirstSample]), theTargetBuffer, theNumberSamples);

                    }

                    break;

                case 24:

                    {

                        UInt8* theSourceBuffer = (UInt8*)inSourceBuffer;

                        if (nativeEndianInts)

                            NativeInt24ToFloat32(&(theSourceBuffer[3*theFirstSample]), theTargetBuffer, theNumberSamples);

                        else

                            SwapInt24ToFloat32(&(theSourceBuffer[3*theFirstSample]), theTargetBuffer, theNumberSamples);

                    }

                    break;

                case 32:

                    {

                        SInt32* theSourceBuffer = (SInt32*)inSourceBuffer;

                        if (nativeEndianInts)

                            NativeInt32ToFloat32(&(theSourceBuffer[theFirstSample]), theTargetBuffer, theNumberSamples);

                        else

                            SwapInt32ToFloat32(&(theSourceBuffer[theFirstSample]), theTargetBuffer, theNumberSamples);

                    }

                    break;

                default:

                    DebugMessageN1("AREngine::convertInputSamples: can't handle signed integers with a bit width of %d", inFormat->fBitWidth);

                    break;

            }

        }

        else if(inFormat->fNumericRepresentation == kIOAudioStreamNumericRepresentationIEEE754Float)

        {

            //  it is some kind of floating point format

        #if TARGET_RT_BIG_ENDIAN

            if((inFormat->fBitWidth == 32) && (inFormat->fBitDepth == 32) && (inFormat->fByteOrder == kIOAudioStreamByteOrderBigEndian))

        #else

            if((inFormat->fBitWidth == 32) && (inFormat->fBitDepth == 32) && (inFormat->fByteOrder == kIOAudioStreamByteOrderLittleEndian))

        #endif

            {

                //  it's Float32, so we are just going to copy the data

                Float32* theSourceBuffer = (Float32*)inSourceBuffer;

                memcpy(theTargetBuffer, &(theSourceBuffer[theFirstSample]), theNumberSamples * sizeof(Float32));

            }

            else

            {

                DebugMessageN2("AREngine::convertInputSamples: can't handle floats with a bit width of %d, bit depth of %d, and/or the given byte order", inFormat->fBitWidth, inFormat->fBitDepth);

            }

        }

    }

    else

    {

        //  it's not linear PCM or it's not mixable, so just copy the data into the target buffer

        SInt8* theSourceBuffer = (SInt8*)inSourceBuffer;

        UInt32 theFirstByte = inFirstFrame * (inFormat->fBitWidth / 8) * inFormat->fNumChannels;

        UInt32 theNumberBytes = inNumberFrames * (inFormat->fBitWidth / 8) * inFormat->fNumChannels;

        memcpy(outTargetBuffer, &(theSourceBuffer[theFirstByte]), theNumberBytes);

    }

    return kIOReturnSuccess;

}