using System;

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class StereoConverter

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{

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    public static void ConvertInterleavedToPlanar(float[] buffer)

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    {

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        if (buffer == null || buffer.Length % 2 != 0)

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            throw new ArgumentException("Buffer must be non-null and have an even number of elements.");

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        int totalSamples = buffer.Length;

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        int halfSamples = totalSamples / 2;

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        unsafe

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        {

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            fixed (float* ptr = buffer)

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            {

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                for (int start = 1; start < totalSamples - 1; start++)

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                {

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                    int current = start;

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                    float temp = ptr[current];

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                    do

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                    {

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                        int next = (current < halfSamples) ? 2 * current + 1 : 2 * (current - halfSamples);

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                        float swap = ptr[next];

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                        ptr[next] = temp;

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                        temp = swap;

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                        current = next;

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                    }

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                    while (current != start);

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                }

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            }

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        }

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    }

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    static void Main()

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    {

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        // Example usage

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        float[] interleaved = { 1.0f, 2.0f, 3.0f, 4.0f, 5.0f, 6.0f, 7.0f, 8.0f };

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        Console.WriteLine("Before Conversion:");

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        Console.WriteLine(string.Join(", ", interleaved));

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        ConvertInterleavedToPlanar(interleaved);

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        Console.WriteLine("After Conversion:");

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        Console.WriteLine(string.Join(", ", interleaved));

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    }

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}

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​