mirror of
https://github.com/GreemDev/Ryujinx.git
synced 2024-12-27 09:14:11 +01:00
130 lines
4.3 KiB
C#
130 lines
4.3 KiB
C#
using System;
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using System.Numerics;
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using System.Runtime.CompilerServices;
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namespace Ryujinx.Audio.Renderer.Dsp
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{
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public static class PcmHelper
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{
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int GetCountToDecode(int startSampleOffset, int endSampleOffset, int offset, int count)
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{
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return Math.Min(count, endSampleOffset - startSampleOffset - offset);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static ulong GetBufferOffset<T>(int startSampleOffset, int offset, int channelCount) where T : unmanaged
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{
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return (ulong)(Unsafe.SizeOf<T>() * channelCount * (startSampleOffset + offset));
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int GetBufferSize<T>(int startSampleOffset, int endSampleOffset, int offset, int count) where T : unmanaged
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{
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return GetCountToDecode(startSampleOffset, endSampleOffset, offset, count) * Unsafe.SizeOf<T>();
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static float ConvertSampleToPcmFloat(short sample)
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{
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return (float)sample / short.MaxValue;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static short ConvertSampleToPcmInt16(float sample)
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{
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return Saturate(sample * short.MaxValue);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static void ConvertSampleToPcm8(Span<sbyte> output, ReadOnlySpan<short> input)
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{
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for (int i = 0; i < input.Length; i++)
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{
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// Output most significant byte
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output[i] = (sbyte)(input[i] >> 8);
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}
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static void ConvertSampleToPcm24(Span<byte> output, ReadOnlySpan<short> input)
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{
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for (int i = 0; i < input.Length; i++)
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{
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output[i * 3 + 2] = (byte)(input[i] >> 8);
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output[i * 3 + 1] = (byte)(input[i] & 0xff);
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output[i * 3 + 0] = 0;
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}
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static void ConvertSampleToPcm32(Span<int> output, ReadOnlySpan<short> input)
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{
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for (int i = 0; i < input.Length; i++)
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{
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output[i] = ((int)input[i]) << 16;
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}
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static void ConvertSampleToPcmFloat(Span<float> output, ReadOnlySpan<short> input)
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{
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for (int i = 0; i < input.Length; i++)
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{
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output[i] = ConvertSampleToPcmFloat(input[i]);
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}
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int Decode(Span<short> output, ReadOnlySpan<short> input, int startSampleOffset, int endSampleOffset, int channelIndex, int channelCount)
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{
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if (input.IsEmpty || endSampleOffset < startSampleOffset)
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{
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return 0;
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}
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int decodedCount = input.Length / channelCount;
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for (int i = 0; i < decodedCount; i++)
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{
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output[i] = input[i * channelCount + channelIndex];
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}
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return decodedCount;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int Decode(Span<short> output, ReadOnlySpan<float> input, int startSampleOffset, int endSampleOffset, int channelIndex, int channelCount)
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{
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if (input.IsEmpty || endSampleOffset < startSampleOffset)
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{
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return 0;
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}
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int decodedCount = input.Length / channelCount;
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for (int i = 0; i < decodedCount; i++)
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{
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output[i] = ConvertSampleToPcmInt16(input[i * channelCount + channelIndex]);
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}
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return decodedCount;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static short Saturate(float value)
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{
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if (value > short.MaxValue)
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{
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return short.MaxValue;
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}
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if (value < short.MinValue)
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{
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return short.MinValue;
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}
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return (short)value;
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}
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}
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} |