/*
  ==============================================================================

   This file is part of the JUCE framework.
   Copyright (c) Raw Material Software Limited

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
   copyrightable work, you agree to the terms of the JUCE End User Licence
   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

   THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
   WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

JUCE_BEGIN_IGNORE_DEPRECATION_WARNINGS

void AudioDataConverters::convertFloatToInt16LE (const float* source, void* dest, int numSamples, int destBytesPerSample)
{
    auto maxVal = (double) 0x7fff;
    auto intData = static_cast<char*> (dest);

    if (dest != (void*) source || destBytesPerSample <= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            *unalignedPointerCast<uint16*> (intData) = ByteOrder::swapIfBigEndian ((uint16) (short) roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])));
            intData += destBytesPerSample;
        }
    }
    else
    {
        intData += destBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= destBytesPerSample;
            *unalignedPointerCast<uint16*> (intData) = ByteOrder::swapIfBigEndian ((uint16) (short) roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])));
        }
    }
}

void AudioDataConverters::convertFloatToInt16BE (const float* source, void* dest, int numSamples, int destBytesPerSample)
{
    auto maxVal = (double) 0x7fff;
    auto intData = static_cast<char*> (dest);

    if (dest != (void*) source || destBytesPerSample <= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            *unalignedPointerCast<uint16*> (intData) = ByteOrder::swapIfLittleEndian ((uint16) (short) roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])));
            intData += destBytesPerSample;
        }
    }
    else
    {
        intData += destBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= destBytesPerSample;
            *unalignedPointerCast<uint16*> (intData) = ByteOrder::swapIfLittleEndian ((uint16) (short) roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])));
        }
    }
}

void AudioDataConverters::convertFloatToInt24LE (const float* source, void* dest, int numSamples, int destBytesPerSample)
{
    auto maxVal = (double) 0x7fffff;
    auto intData = static_cast<char*> (dest);

    if (dest != (void*) source || destBytesPerSample <= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            ByteOrder::littleEndian24BitToChars (roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])), intData);
            intData += destBytesPerSample;
        }
    }
    else
    {
        intData += destBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= destBytesPerSample;
            ByteOrder::littleEndian24BitToChars (roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])), intData);
        }
    }
}

void AudioDataConverters::convertFloatToInt24BE (const float* source, void* dest, int numSamples, int destBytesPerSample)
{
    auto maxVal = (double) 0x7fffff;
    auto intData = static_cast<char*> (dest);

    if (dest != (void*) source || destBytesPerSample <= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            ByteOrder::bigEndian24BitToChars (roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])), intData);
            intData += destBytesPerSample;
        }
    }
    else
    {
        intData += destBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= destBytesPerSample;
            ByteOrder::bigEndian24BitToChars (roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])), intData);
        }
    }
}

void AudioDataConverters::convertFloatToInt32LE (const float* source, void* dest, int numSamples, int destBytesPerSample)
{
    auto maxVal = (double) 0x7fffffff;
    auto intData = static_cast<char*> (dest);

    if (dest != (void*) source || destBytesPerSample <= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            *unalignedPointerCast<uint32*> (intData) = ByteOrder::swapIfBigEndian ((uint32) roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])));
            intData += destBytesPerSample;
        }
    }
    else
    {
        intData += destBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= destBytesPerSample;
            *unalignedPointerCast<uint32*> (intData) = ByteOrder::swapIfBigEndian ((uint32) roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])));
        }
    }
}

void AudioDataConverters::convertFloatToInt32BE (const float* source, void* dest, int numSamples, int destBytesPerSample)
{
    auto maxVal = (double) 0x7fffffff;
    auto intData = static_cast<char*> (dest);

    if (dest != (void*) source || destBytesPerSample <= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            *unalignedPointerCast<uint32*> (intData) = ByteOrder::swapIfLittleEndian ((uint32) roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])));
            intData += destBytesPerSample;
        }
    }
    else
    {
        intData += destBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= destBytesPerSample;
            *unalignedPointerCast<uint32*> (intData) = ByteOrder::swapIfLittleEndian ((uint32) roundToInt (jlimit (-maxVal, maxVal, maxVal * source[i])));
        }
    }
}

void AudioDataConverters::convertFloatToFloat32LE (const float* source, void* dest, int numSamples, int destBytesPerSample)
{
    jassert (dest != (void*) source || destBytesPerSample <= 4); // This op can't be performed on in-place data!

    char* d = static_cast<char*> (dest);

    for (int i = 0; i < numSamples; ++i)
    {
        *unalignedPointerCast<float*> (d) = source[i];

       #if JUCE_BIG_ENDIAN
        *unalignedPointerCast<uint32*> (d) = ByteOrder::swap (*unalignedPointerCast<uint32*> (d));
       #endif

        d += destBytesPerSample;
    }
}

void AudioDataConverters::convertFloatToFloat32BE (const float* source, void* dest, int numSamples, int destBytesPerSample)
{
    jassert (dest != (void*) source || destBytesPerSample <= 4); // This op can't be performed on in-place data!

    auto d = static_cast<char*> (dest);

    for (int i = 0; i < numSamples; ++i)
    {
        *unalignedPointerCast<float*> (d) = source[i];

       #if JUCE_LITTLE_ENDIAN
        *unalignedPointerCast<uint32*> (d) = ByteOrder::swap (*unalignedPointerCast<uint32*> (d));
       #endif

        d += destBytesPerSample;
    }
}

//==============================================================================
void AudioDataConverters::convertInt16LEToFloat (const void* source, float* dest, int numSamples, int srcBytesPerSample)
{
    const float scale = 1.0f / 0x7fff;
    auto intData = static_cast<const char*> (source);

    if (source != (void*) dest || srcBytesPerSample >= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            dest[i] = scale * (short) ByteOrder::swapIfBigEndian (*unalignedPointerCast<const uint16*> (intData));
            intData += srcBytesPerSample;
        }
    }
    else
    {
        intData += srcBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= srcBytesPerSample;
            dest[i] = scale * (short) ByteOrder::swapIfBigEndian (*unalignedPointerCast<const uint16*> (intData));
        }
    }
}

void AudioDataConverters::convertInt16BEToFloat (const void* source, float* dest, int numSamples, int srcBytesPerSample)
{
    const float scale = 1.0f / 0x7fff;
    auto intData = static_cast<const char*> (source);

    if (source != (void*) dest || srcBytesPerSample >= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            dest[i] = scale * (short) ByteOrder::swapIfLittleEndian (*unalignedPointerCast<const uint16*> (intData));
            intData += srcBytesPerSample;
        }
    }
    else
    {
        intData += srcBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= srcBytesPerSample;
            dest[i] = scale * (short) ByteOrder::swapIfLittleEndian (*unalignedPointerCast<const uint16*> (intData));
        }
    }
}

void AudioDataConverters::convertInt24LEToFloat (const void* source, float* dest, int numSamples, int srcBytesPerSample)
{
    const float scale = 1.0f / 0x7fffff;
    auto intData = static_cast<const char*> (source);

    if (source != (void*) dest || srcBytesPerSample >= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            dest[i] = scale * (short) ByteOrder::littleEndian24Bit (intData);
            intData += srcBytesPerSample;
        }
    }
    else
    {
        intData += srcBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= srcBytesPerSample;
            dest[i] = scale * (short) ByteOrder::littleEndian24Bit (intData);
        }
    }
}

void AudioDataConverters::convertInt24BEToFloat (const void* source, float* dest, int numSamples, int srcBytesPerSample)
{
    const float scale = 1.0f / 0x7fffff;
    auto intData = static_cast<const char*> (source);

    if (source != (void*) dest || srcBytesPerSample >= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            dest[i] = scale * (short) ByteOrder::bigEndian24Bit (intData);
            intData += srcBytesPerSample;
        }
    }
    else
    {
        intData += srcBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= srcBytesPerSample;
            dest[i] = scale * (short) ByteOrder::bigEndian24Bit (intData);
        }
    }
}

void AudioDataConverters::convertInt32LEToFloat (const void* source, float* dest, int numSamples, int srcBytesPerSample)
{
    const float scale = 1.0f / (float) 0x7fffffff;
    auto intData = static_cast<const char*> (source);

    if (source != (void*) dest || srcBytesPerSample >= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            dest[i] = scale * (float) ByteOrder::swapIfBigEndian (*unalignedPointerCast<const uint32*> (intData));
            intData += srcBytesPerSample;
        }
    }
    else
    {
        intData += srcBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= srcBytesPerSample;
            dest[i] = scale * (float) ByteOrder::swapIfBigEndian (*unalignedPointerCast<const uint32*> (intData));
        }
    }
}

void AudioDataConverters::convertInt32BEToFloat (const void* source, float* dest, int numSamples, int srcBytesPerSample)
{
    const float scale = 1.0f / (float) 0x7fffffff;
    auto intData = static_cast<const char*> (source);

    if (source != (void*) dest || srcBytesPerSample >= 4)
    {
        for (int i = 0; i < numSamples; ++i)
        {
            dest[i] = scale * (float) ByteOrder::swapIfLittleEndian (*unalignedPointerCast<const uint32*> (intData));
            intData += srcBytesPerSample;
        }
    }
    else
    {
        intData += srcBytesPerSample * numSamples;

        for (int i = numSamples; --i >= 0;)
        {
            intData -= srcBytesPerSample;
            dest[i] = scale * (float) ByteOrder::swapIfLittleEndian (*unalignedPointerCast<const uint32*> (intData));
        }
    }
}

void AudioDataConverters::convertFloat32LEToFloat (const void* source, float* dest, int numSamples, int srcBytesPerSample)
{
    auto s = static_cast<const char*> (source);

    for (int i = 0; i < numSamples; ++i)
    {
        dest[i] = *unalignedPointerCast<const float*> (s);

       #if JUCE_BIG_ENDIAN
        auto d = unalignedPointerCast<uint32*> (dest + i);
        *d = ByteOrder::swap (*d);
       #endif

        s += srcBytesPerSample;
    }
}

void AudioDataConverters::convertFloat32BEToFloat (const void* source, float* dest, int numSamples, int srcBytesPerSample)
{
    auto s = static_cast<const char*> (source);

    for (int i = 0; i < numSamples; ++i)
    {
        dest[i] = *unalignedPointerCast<const float*> (s);

       #if JUCE_LITTLE_ENDIAN
        auto d = unalignedPointerCast<uint32*> (dest + i);
        *d = ByteOrder::swap (*d);
       #endif

        s += srcBytesPerSample;
    }
}


//==============================================================================
void AudioDataConverters::convertFloatToFormat (DataFormat destFormat, const float* source, void* dest, int numSamples)
{
    switch (destFormat)
    {
        case int16LE:       convertFloatToInt16LE   (source, dest, numSamples); break;
        case int16BE:       convertFloatToInt16BE   (source, dest, numSamples); break;
        case int24LE:       convertFloatToInt24LE   (source, dest, numSamples); break;
        case int24BE:       convertFloatToInt24BE   (source, dest, numSamples); break;
        case int32LE:       convertFloatToInt32LE   (source, dest, numSamples); break;
        case int32BE:       convertFloatToInt32BE   (source, dest, numSamples); break;
        case float32LE:     convertFloatToFloat32LE (source, dest, numSamples); break;
        case float32BE:     convertFloatToFloat32BE (source, dest, numSamples); break;
        default:            jassertfalse; break;
    }
}

void AudioDataConverters::convertFormatToFloat (DataFormat sourceFormat, const void* source, float* dest, int numSamples)
{
    switch (sourceFormat)
    {
        case int16LE:       convertInt16LEToFloat   (source, dest, numSamples); break;
        case int16BE:       convertInt16BEToFloat   (source, dest, numSamples); break;
        case int24LE:       convertInt24LEToFloat   (source, dest, numSamples); break;
        case int24BE:       convertInt24BEToFloat   (source, dest, numSamples); break;
        case int32LE:       convertInt32LEToFloat   (source, dest, numSamples); break;
        case int32BE:       convertInt32BEToFloat   (source, dest, numSamples); break;
        case float32LE:     convertFloat32LEToFloat (source, dest, numSamples); break;
        case float32BE:     convertFloat32BEToFloat (source, dest, numSamples); break;
        default:            jassertfalse; break;
    }
}

//==============================================================================
void AudioDataConverters::interleaveSamples (const float** source, float* dest, int numSamples, int numChannels)
{
    using Format = AudioData::Format<AudioData::Float32, AudioData::NativeEndian>;

    AudioData::interleaveSamples (AudioData::NonInterleavedSource<Format> { source, numChannels },
                                  AudioData::InterleavedDest<Format>      { dest,   numChannels },
                                  numSamples);
}

void AudioDataConverters::deinterleaveSamples (const float* source, float** dest, int numSamples, int numChannels)
{
    using Format = AudioData::Format<AudioData::Float32, AudioData::NativeEndian>;

    AudioData::deinterleaveSamples (AudioData::InterleavedSource<Format>  { source, numChannels },
                                    AudioData::NonInterleavedDest<Format> { dest,   numChannels },
                                    numSamples);
}

//==============================================================================
//==============================================================================
#if JUCE_UNIT_TESTS

class AudioConversionTests final : public UnitTest
{
public:
    AudioConversionTests()
        : UnitTest ("Audio data conversion", UnitTestCategories::audio)
    {}

    template <class F1, class E1, class F2, class E2>
    struct Test5
    {
        static void test (UnitTest& unitTest, Random& r)
        {
            test (unitTest, false, r);
            test (unitTest, true, r);
        }

        JUCE_BEGIN_IGNORE_WARNINGS_MSVC (6262)
        static void test (UnitTest& unitTest, bool inPlace, Random& r)
        {
            const int numSamples = 2048;
            int32 original [(size_t) numSamples],
                  converted[(size_t) numSamples],
                  reversed [(size_t) numSamples];

            {
                AudioData::Pointer<F1, E1, AudioData::NonInterleaved, AudioData::NonConst> d (original);
                bool clippingFailed = false;

                for (int i = 0; i < numSamples / 2; ++i)
                {
                    d.setAsFloat (r.nextFloat() * 2.2f - 1.1f);

                    if (! d.isFloatingPoint())
                        clippingFailed = d.getAsFloat() > 1.0f || d.getAsFloat() < -1.0f || clippingFailed;

                    ++d;
                    d.setAsInt32 (r.nextInt());
                    ++d;
                }

                unitTest.expect (! clippingFailed);
            }

            // convert data from the source to dest format..
            std::unique_ptr<AudioData::Converter> conv (new AudioData::ConverterInstance<AudioData::Pointer<F1, E1, AudioData::NonInterleaved, AudioData::Const>,
                                                                                         AudioData::Pointer<F2, E2, AudioData::NonInterleaved, AudioData::NonConst>>());
            conv->convertSamples (inPlace ? reversed : converted, original, numSamples);

            // ..and back again..
            conv.reset (new AudioData::ConverterInstance<AudioData::Pointer<F2, E2, AudioData::NonInterleaved, AudioData::Const>,
                                                         AudioData::Pointer<F1, E1, AudioData::NonInterleaved, AudioData::NonConst>>());
            if (! inPlace)
                zeromem (reversed, sizeof (reversed));

            conv->convertSamples (reversed, inPlace ? reversed : converted, numSamples);

            {
                int biggestDiff = 0;
                AudioData::Pointer<F1, E1, AudioData::NonInterleaved, AudioData::Const> d1 (original);
                AudioData::Pointer<F1, E1, AudioData::NonInterleaved, AudioData::Const> d2 (reversed);

                const int errorMargin = 2 * AudioData::Pointer<F1, E1, AudioData::NonInterleaved, AudioData::Const>::get32BitResolution()
                                          + AudioData::Pointer<F2, E2, AudioData::NonInterleaved, AudioData::Const>::get32BitResolution();

                for (int i = 0; i < numSamples; ++i)
                {
                    biggestDiff = jmax (biggestDiff, std::abs (d1.getAsInt32() - d2.getAsInt32()));
                    ++d1;
                    ++d2;
                }

                unitTest.expect (biggestDiff <= errorMargin);
            }
        }
        JUCE_END_IGNORE_WARNINGS_MSVC
    };

    template <class F1, class E1, class FormatType>
    struct Test3
    {
        static void test (UnitTest& unitTest, Random& r)
        {
            Test5 <F1, E1, FormatType, AudioData::BigEndian>::test (unitTest, r);
            Test5 <F1, E1, FormatType, AudioData::LittleEndian>::test (unitTest, r);
        }
    };

    template <class FormatType, class Endianness>
    struct Test2
    {
        static void test (UnitTest& unitTest, Random& r)
        {
            Test3 <FormatType, Endianness, AudioData::Int8>::test (unitTest, r);
            Test3 <FormatType, Endianness, AudioData::UInt8>::test (unitTest, r);
            Test3 <FormatType, Endianness, AudioData::Int16>::test (unitTest, r);
            Test3 <FormatType, Endianness, AudioData::Int24>::test (unitTest, r);
            Test3 <FormatType, Endianness, AudioData::Int32>::test (unitTest, r);
            Test3 <FormatType, Endianness, AudioData::Float32>::test (unitTest, r);
        }
    };

    template <class FormatType>
    struct Test1
    {
        static void test (UnitTest& unitTest, Random& r)
        {
            Test2 <FormatType, AudioData::BigEndian>::test (unitTest, r);
            Test2 <FormatType, AudioData::LittleEndian>::test (unitTest, r);
        }
    };

    void runTest() override
    {
        auto r = getRandom();
        beginTest ("Round-trip conversion: Int8");
        Test1 <AudioData::Int8>::test (*this, r);
        beginTest ("Round-trip conversion: Int16");
        Test1 <AudioData::Int16>::test (*this, r);
        beginTest ("Round-trip conversion: Int24");
        Test1 <AudioData::Int24>::test (*this, r);
        beginTest ("Round-trip conversion: Int32");
        Test1 <AudioData::Int32>::test (*this, r);
        beginTest ("Round-trip conversion: Float32");
        Test1 <AudioData::Float32>::test (*this, r);

        using Format = AudioData::Format<AudioData::Float32, AudioData::NativeEndian>;

        beginTest ("Interleaving");
        {
            constexpr auto numChannels = 4;
            constexpr auto numSamples = 512;

            AudioBuffer<float> sourceBuffer { numChannels, numSamples },
                               destBuffer   { 1, numChannels * numSamples };

            for (int ch = 0; ch < numChannels; ++ch)
                for (int i = 0; i < numSamples; ++i)
                    sourceBuffer.setSample (ch, i, r.nextFloat());

            AudioData::interleaveSamples (AudioData::NonInterleavedSource<Format> { sourceBuffer.getArrayOfReadPointers(), numChannels },
                                          AudioData::InterleavedDest<Format>      { destBuffer.getWritePointer (0),        numChannels },
                                          numSamples);

            for (int ch = 0; ch < numChannels; ++ch)
                for (int i = 0; i < numSamples; ++i)
                    expectEquals (destBuffer.getSample (0, ch + (i * numChannels)), sourceBuffer.getSample (ch, i));
        }

        beginTest ("Deinterleaving");
        {
            constexpr auto numChannels = 4;
            constexpr auto numSamples = 512;

            AudioBuffer<float> sourceBuffer { 1, numChannels * numSamples },
                               destBuffer   { numChannels, numSamples };

            for (int ch = 0; ch < numChannels; ++ch)
                for (int i = 0; i < numSamples; ++i)
                    sourceBuffer.setSample (0, ch + (i * numChannels), r.nextFloat());

            AudioData::deinterleaveSamples (AudioData::InterleavedSource<Format>  { sourceBuffer.getReadPointer (0),      numChannels },
                                            AudioData::NonInterleavedDest<Format> { destBuffer.getArrayOfWritePointers(), numChannels },
                                            numSamples);

            for (int ch = 0; ch < numChannels; ++ch)
                for (int i = 0; i < numSamples; ++i)
                    expectEquals (sourceBuffer.getSample (0, ch + (i * numChannels)), destBuffer.getSample (ch, i));
        }
    }
};

static AudioConversionTests audioConversionUnitTests;

#endif

JUCE_END_IGNORE_DEPRECATION_WARNINGS

} // namespace juce
