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using System;
using System.Numerics;
using System.Runtime.CompilerServices;
namespace Ryujinx.Audio.Renderer.Dsp
{
public static class PcmHelper
{
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static int GetCountToDecode(int startSampleOffset, int endSampleOffset, int offset, int count)
{
return Math.Min(count, endSampleOffset - startSampleOffset - offset);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static ulong GetBufferOffset<T>(int startSampleOffset, int offset, int channelCount) where T : unmanaged
{
return (ulong)(Unsafe.SizeOf<T>() * channelCount * (startSampleOffset + offset));
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static int GetBufferSize<T>(int startSampleOffset, int endSampleOffset, int offset, int count) where T : unmanaged
{
return GetCountToDecode(startSampleOffset, endSampleOffset, offset, count) * Unsafe.SizeOf<T>();
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static float ConvertSampleToPcmFloat(short sample)
{
return (float)sample / short.MaxValue;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static short ConvertSampleToPcmInt16(float sample)
{
return Saturate(sample * short.MaxValue);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static void ConvertSampleToPcm8(Span<sbyte> output, ReadOnlySpan<short> input)
{
for (int i = 0; i < input.Length; i++)
{
// Output most significant byte
output[i] = (sbyte)(input[i] >> 8);
}
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static void ConvertSampleToPcm24(Span<byte> output, ReadOnlySpan<short> input)
{
for (int i = 0; i < input.Length; i++)
{
output[i * 3 + 2] = (byte)(input[i] >> 8);
output[i * 3 + 1] = (byte)(input[i] & 0xff);
output[i * 3 + 0] = 0;
}
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static void ConvertSampleToPcm32(Span<int> output, ReadOnlySpan<short> input)
{
for (int i = 0; i < input.Length; i++)
{
output[i] = ((int)input[i]) << 16;
}
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static void ConvertSampleToPcmFloat(Span<float> output, ReadOnlySpan<short> input)
{
for (int i = 0; i < input.Length; i++)
{
output[i] = ConvertSampleToPcmFloat(input[i]);
}
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static int Decode(Span<short> output, ReadOnlySpan<short> input, int startSampleOffset, int endSampleOffset, int channelIndex, int channelCount)
{
if (input.IsEmpty || endSampleOffset < startSampleOffset)
{
return 0;
}
int decodedCount = input.Length / channelCount;
for (int i = 0; i < decodedCount; i++)
{
output[i] = input[i * channelCount + channelIndex];
}
return decodedCount;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static int Decode(Span<short> output, ReadOnlySpan<float> input, int startSampleOffset, int endSampleOffset, int channelIndex, int channelCount)
{
if (input.IsEmpty || endSampleOffset < startSampleOffset)
{
return 0;
}
int decodedCount = input.Length / channelCount;
for (int i = 0; i < decodedCount; i++)
{
output[i] = ConvertSampleToPcmInt16(input[i * channelCount + channelIndex]);
}
return decodedCount;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static short Saturate(float value)
{
if (value > short.MaxValue)
{
return short.MaxValue;
}
if (value < short.MinValue)
{
return short.MinValue;
}
return (short)value;
}
}
}
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