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

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*/

#include "RenderSin.h"

// THESE values can be read from your data source

// they're used to tell the DefaultOutputUnit what you're giving it

Float64         sSampleRate = 48000;

SInt32          sNumChannels = 2;

SInt32          sWhichFormat = kAsFloat;

UInt32          sSinWaveFrameCount = 0; // this keeps track of the number of frames you render

double          sAmplitude = 0.25;

double          sToneFrequency = 440.;

UInt32 theFormatID = kAudioFormatLinearPCM;

// these are set based on which format is chosen

UInt32 theFormatFlags = 0;

UInt32 theBytesInAPacket = 0;

UInt32 theBitsPerChannel = 0;

UInt32 theBytesPerFrame = 0;

// these are the same regardless of format

UInt32 theFramesPerPacket = 1; // this shouldn't change

UInt32 sampleNextPrinted = 0;//print first time (UInt32)gSampleRate;

// REALLY should have a different version for each of the 3 bit depths...

// simulates reading the UInt data from the disk

// returns the adjusted frame count

void RenderSin (UInt32              startingFrameCount, 

                UInt32              inFrames, 

                void*               inBuffer, 

                double              inSampleRate, 

                double              amplitude, 

                double              frequency,

                int                 inOutputFormat) 

{

    double j = startingFrameCount;

    double cycleLength = inSampleRate / frequency;

    // mNumberBuffers is the same as the kNumChannels

    for (UInt32 frame = 0; frame < inFrames; ++frame) 

    {

        // generate inFrames 32-bit floats

        Float32 nextFloat = sin(j / cycleLength * (M_PI * 2.0)) * amplitude;

        switch (inOutputFormat) {

            case kAsFloat:

                static_cast<Float32*>(inBuffer)[frame] = nextFloat;

                break;

            case kAs16Bit:

                static_cast<SInt16*>(inBuffer)[frame] = static_cast<SInt16>(nextFloat * 32768. + 0.5);

                break;

            case kAs24Bit:

                static_cast<UInt32*>(inBuffer)[frame] = static_cast<UInt32>(nextFloat * 8388608. + 0.5);

                break;

        }

        j += 1.0;

        if (j > cycleLength)

            j -= cycleLength;

    }

    if (startingFrameCount >= sampleNextPrinted) {

        printf ("Current Slice: inFrames=%ld, startingFrameCount=%ld\n", inFrames, startingFrameCount);

        sampleNextPrinted += (int)inSampleRate;

    }

}

const char* usageStr = "usage: [-d 16,24,32] where 32 is float, [-c numChannels], [-s sampleRate in Hz] [-a amplitude (0 - 1)], [-f freuency Hz]";

int ParseArgsAndSetup (int argc, const char* argv[])

{

    for (int i = 1; i < argc; ++i)

    {

        const char* str = argv[i];

        if (!strcmp ("-h", str)) {

            printf ("%s\n", usageStr);

            return -1;

        }

        else if (!strcmp ("-d", str)) {

            sscanf (argv[++i], "%ld", &sWhichFormat);

        } 

        else if (!strcmp ("-c", str)) {

            sscanf (argv[++i], "%ld", &sNumChannels);

        }

        else if (!strcmp ("-s", str)) {

            sscanf (argv[++i], "%lf", &sSampleRate);

        }

        else if (!strcmp ("-a", str)) {

            sscanf (argv[++i], "%lf", &sAmplitude);

        }

        else if (!strcmp ("-f", str)) {

            sscanf (argv[++i], "%lf", &sToneFrequency);

        } else {

            printf ("%s\n", usageStr);

            return -1;

        }

    }

    printf ("generating sin wave at %f Hz, %f amplitude\n", sToneFrequency, sAmplitude);

    switch (sWhichFormat) {

        case kAsFloat:

            theFormatFlags =  kAudioFormatFlagsNativeFloatPacked

                                | kAudioFormatFlagIsNonInterleaved;

            theBytesPerFrame = theBytesInAPacket = 4;

            theBitsPerChannel = 32;

            break;

        case kAs16Bit:

            theFormatFlags =  kLinearPCMFormatFlagIsSignedInteger 

                                | kAudioFormatFlagsNativeEndian

                                | kLinearPCMFormatFlagIsPacked

                                | kAudioFormatFlagIsNonInterleaved;

            theBytesPerFrame = theBytesInAPacket = 2;

            theBitsPerChannel = 16;     

            break;

        case kAs24Bit:

            theFormatFlags =  kLinearPCMFormatFlagIsSignedInteger 

                                | kAudioFormatFlagsNativeEndian

                                | kAudioFormatFlagIsNonInterleaved;

            theBytesPerFrame = theBytesInAPacket = 4;

            theBitsPerChannel = 24;

            break;

        default:

            printf ("unknown format\n");

            return -1;

    }

    return 0;

}