81 lines
2.4 KiB
C#
81 lines
2.4 KiB
C#
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using System;
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using System.Runtime.InteropServices;
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using NAudio.CoreAudioApi.Interfaces;
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namespace NAudio.Dmo
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{
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/// <summary>
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/// From wmcodecsdp.h
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/// Implements:
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/// - IMediaObject
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/// - IMFTransform (Media foundation - we will leave this for now as there is loads of MF stuff)
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/// - IPropertyStore
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/// - IWMResamplerProps
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/// Can resample PCM or IEEE
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/// </summary>
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[ComImport, Guid("f447b69e-1884-4a7e-8055-346f74d6edb3")]
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class ResamplerMediaComObject
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{
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}
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/// <summary>
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/// DMO Resampler
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/// </summary>
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public class DmoResampler : IDisposable
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{
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MediaObject mediaObject;
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IPropertyStore propertyStoreInterface;
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IWMResamplerProps resamplerPropsInterface;
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ResamplerMediaComObject mediaComObject;
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/// <summary>
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/// Creates a new Resampler based on the DMO Resampler
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/// </summary>
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public DmoResampler()
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{
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mediaComObject = new ResamplerMediaComObject();
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mediaObject = new MediaObject((IMediaObject)mediaComObject);
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propertyStoreInterface = (IPropertyStore)mediaComObject;
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resamplerPropsInterface = (IWMResamplerProps)mediaComObject;
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}
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/// <summary>
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/// Media Object
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/// </summary>
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public MediaObject MediaObject => mediaObject;
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#region IDisposable Members
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/// <summary>
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/// Dispose code - experimental at the moment
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/// Was added trying to track down why Resampler crashes NUnit
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/// This code not currently being called by ResamplerDmoStream
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/// </summary>
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public void Dispose()
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{
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if(propertyStoreInterface != null)
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{
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Marshal.ReleaseComObject(propertyStoreInterface);
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propertyStoreInterface = null;
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}
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if(resamplerPropsInterface != null)
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{
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Marshal.ReleaseComObject(resamplerPropsInterface);
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resamplerPropsInterface = null;
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}
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if (mediaObject != null)
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{
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mediaObject.Dispose();
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mediaObject = null;
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}
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if (mediaComObject != null)
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{
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Marshal.ReleaseComObject(mediaComObject);
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mediaComObject = null;
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}
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}
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#endregion
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}
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}
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