// // Copyright (c) 2019-2021 Ryujinx // // This program is free software: you can redistribute it and/or modify // it under the terms of the GNU Lesser General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU Lesser General Public License for more details. // // You should have received a copy of the GNU Lesser General Public License // along with this program. If not, see <https://www.gnu.org/licenses/>. // using System; 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 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] = (short)(input[i * channelCount + channelIndex] * short.MaxValue); } 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; } } }