76 lines
2.6 KiB
C#
76 lines
2.6 KiB
C#
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/*
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LICENSE
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-------
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Copyright (C) 2007 Ray Molenkamp
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This source code is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this source code or the software it produces.
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Permission is granted to anyone to use this source code for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this source code must not be misrepresented; you must not
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claim that you wrote the original source code. If you use this source code
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original source code.
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3. This notice may not be removed or altered from any source distribution.
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*/
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using System;
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using NAudio.CoreAudioApi.Interfaces;
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using System.Runtime.InteropServices;
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namespace NAudio.CoreAudioApi
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{
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/// <summary>
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/// Audio Meter Information Channels
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/// </summary>
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public class AudioMeterInformationChannels
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{
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private readonly IAudioMeterInformation audioMeterInformation;
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/// <summary>
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/// Metering Channel Count
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/// </summary>
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public int Count
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{
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get
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{
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Marshal.ThrowExceptionForHR(audioMeterInformation.GetMeteringChannelCount(out var result));
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return result;
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}
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}
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/// <summary>
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/// Get Peak value
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/// </summary>
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/// <param name="index">Channel index</param>
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/// <returns>Peak value</returns>
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public float this[int index]
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{
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get
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{
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var channels = Count;
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if (index >= channels)
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{
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throw new ArgumentOutOfRangeException(nameof(index),
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$"Peak index cannot be greater than number of channels ({channels})");
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}
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var peakValues = new float[Count];
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var Params = GCHandle.Alloc(peakValues, GCHandleType.Pinned);
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Marshal.ThrowExceptionForHR(audioMeterInformation.GetChannelsPeakValues(peakValues.Length, Params.AddrOfPinnedObject()));
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Params.Free();
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return peakValues[index];
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}
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}
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internal AudioMeterInformationChannels(IAudioMeterInformation parent)
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{
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audioMeterInformation = parent;
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}
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}
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}
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