75 lines
3.1 KiB
C#
75 lines
3.1 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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(Modified for NAudio by Mark Heath)
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*/
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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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using NAudio.Utils;
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namespace NAudio.CoreAudioApi
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{
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// This class implements the IAudioEndpointVolumeCallback interface,
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// it is implemented in this class because implementing it on AudioEndpointVolume
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// (where the functionality is really wanted, would cause the OnNotify function
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// to show up in the public API.
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internal class AudioEndpointVolumeCallback : IAudioEndpointVolumeCallback
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{
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private readonly AudioEndpointVolume parent;
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internal AudioEndpointVolumeCallback(AudioEndpointVolume parent)
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{
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this.parent = parent;
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}
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public void OnNotify(IntPtr notifyData)
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{
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//Since AUDIO_VOLUME_NOTIFICATION_DATA is dynamic in length based on the
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//number of audio channels available we cannot just call PtrToStructure
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//to get all data, thats why it is split up into two steps, first the static
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//data is marshalled into the data structure, then with some IntPtr math the
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//remaining floats are read from memory.
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//
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var data = Marshal.PtrToStructure<AudioVolumeNotificationDataStruct>(notifyData);
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//Determine offset in structure of the first float
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var offset = Marshal.OffsetOf<AudioVolumeNotificationDataStruct>("ChannelVolume");
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//Determine offset in memory of the first float
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var firstFloatPtr = (IntPtr)((long)notifyData + (long)offset);
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var voldata = new float[data.nChannels];
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//Read all floats from memory.
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for (int i = 0; i < data.nChannels; i++)
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{
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voldata[i] = Marshal.PtrToStructure<float>(firstFloatPtr);
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}
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//Create combined structure and Fire Event in parent class.
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var notificationData = new AudioVolumeNotificationData(data.guidEventContext, data.bMuted, data.fMasterVolume, voldata, data.guidEventContext);
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parent.FireNotification(notificationData);
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}
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}
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}
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