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#region License
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/* FNA - XNA4 Reimplementation for Desktop Platforms
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* Copyright 2009-2020 Ethan Lee and the MonoGame Team
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*
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* Released under the Microsoft Public License.
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* See LICENSE for details.
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*/
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#endregion
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#region Using Statements
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using System;
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using System.Collections.ObjectModel;
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#endregion
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namespace Microsoft.Xna.Framework.Audio
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{
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public class Microphone
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{
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#region Public Static Properties
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public static ReadOnlyCollection<Microphone> All
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{
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get
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{
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if (micList == null)
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{
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micList = new ReadOnlyCollection<Microphone>(
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FNAPlatform.GetMicrophones()
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);
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}
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return micList;
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}
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}
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public static Microphone Default
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{
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get
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{
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if (All.Count == 0)
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{
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return null;
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}
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return All[0];
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}
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}
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#endregion
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#region Public Properties
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public TimeSpan BufferDuration
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{
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get
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{
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return bufferDuration;
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}
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set
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{
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if ( value.Milliseconds < 100 ||
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value.Milliseconds > 1000 ||
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value.Milliseconds % 10 != 0 )
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{
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throw new ArgumentOutOfRangeException();
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}
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bufferDuration = value;
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}
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}
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public bool IsHeadset
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{
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get
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{
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// FIXME: I think this is just for Windows Phone? -flibit
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return false;
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}
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}
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public int SampleRate
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{
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get
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{
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return SAMPLERATE;
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}
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}
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public MicrophoneState State
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{
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get;
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private set;
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}
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#endregion
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#region Public Variables
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public readonly string Name;
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#endregion
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#region Private Variables
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private TimeSpan bufferDuration;
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private uint handle;
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#endregion
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#region Internal Static Variables
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internal static ReadOnlyCollection<Microphone> micList;
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#endregion
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#region Events
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public event EventHandler<EventArgs> BufferReady;
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#endregion
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#region Internal Constants
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/* FIXME: This is what XNA4 aims for, but it _could_ be lower.
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* Something worth looking at is falling back to lower sample
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* rates in powers of two, i.e. 44100, 22050, 11025, etc.
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* -flibit
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*/
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internal const int SAMPLERATE = 44100;
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#endregion
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#region Internal Constructor
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internal Microphone(uint id, string name)
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{
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handle = id;
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Name = name;
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bufferDuration = TimeSpan.FromSeconds(1.0);
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State = MicrophoneState.Stopped;
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}
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#endregion
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#region Public Methods
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public int GetData(byte[] buffer)
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{
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return GetData(buffer, 0, buffer.Length);
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}
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public int GetData(byte[] buffer, int offset, int count)
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{
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if (buffer == null)
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{
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throw new ArgumentException("buffer is null!");
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}
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if (offset < 0 || offset > buffer.Length)
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{
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throw new ArgumentException("offset");
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}
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if (count <= 0 || (offset + count) > buffer.Length)
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{
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throw new ArgumentException("count");
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}
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return FNAPlatform.GetMicrophoneSamples(
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handle,
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buffer,
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offset,
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count
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);
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}
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public TimeSpan GetSampleDuration(int sizeInBytes)
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{
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return SoundEffect.GetSampleDuration(
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sizeInBytes,
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SampleRate,
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AudioChannels.Mono
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);
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}
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public int GetSampleSizeInBytes(TimeSpan duration)
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{
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return SoundEffect.GetSampleSizeInBytes(
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duration,
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SampleRate,
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AudioChannels.Mono
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);
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}
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public void Start()
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{
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FNAPlatform.StartMicrophone(handle);
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State = MicrophoneState.Started;
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}
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public void Stop()
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{
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FNAPlatform.StopMicrophone(handle);
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State = MicrophoneState.Stopped;
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}
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#endregion
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#region Internal Methods
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internal void CheckBuffer()
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{
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if ( BufferReady != null &&
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GetSampleDuration(FNAPlatform.GetMicrophoneQueuedBytes(handle)) > bufferDuration )
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{
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BufferReady(this, EventArgs.Empty);
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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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