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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 | #region License/* FNA - XNA4 Reimplementation for Desktop Platforms * Copyright 2009-2016 Ethan Lee and the MonoGame Team * * Released under the Microsoft Public License. * See LICENSE for details. */#endregion#region Using Statementsusing System;using System.Collections.ObjectModel;using System.Runtime.InteropServices;#endregionnamespace Microsoft.Xna.Framework.Audio{ public class Microphone { #region Public Static Properties public static ReadOnlyCollection<Microphone> All { get; internal set; } public static Microphone Default { get { if (All.Count == 0) { return null; } return All[0]; } } #endregion #region Public Properties public TimeSpan BufferDuration { get { return bufferDuration; } set { if ( value.Milliseconds < 100 || value.Milliseconds > 1000 || value.Milliseconds % 10 != 0 ) { throw new ArgumentOutOfRangeException(); } bufferDuration = value; } } public bool IsHeadset { get { // FIXME: I think this is just for Windows Phone? -flibit return false; } } public int SampleRate { get { return SAMPLERATE; } } public MicrophoneState State { get; private set; } #endregion #region Public Variables public readonly string Name; #endregion #region Private Variables private TimeSpan bufferDuration; private IntPtr nativeMic; #endregion #region Events public event EventHandler<EventArgs> BufferReady; #endregion #region Private Constants /* FIXME: This is what XNA4 aims for, but it _could_ be lower. * Something work looking at is falling back to lower sample rates in * powers of two, i.e. 44100, 22050, 11025, etc. * -flibit */ private const int SAMPLERATE = 44100; #endregion #region Internal Constructor internal Microphone(string name) { Name = name; bufferDuration = TimeSpan.FromSeconds(1.0); State = MicrophoneState.Stopped; } #endregion #region Public Methods public int GetData(byte[] buffer) { return GetData(buffer, 0, buffer.Length); } public int GetData(byte[] buffer, int offset, int count) { if (buffer == null) { throw new ArgumentException("buffer is null!"); } if (offset < 0 || offset > buffer.Length) { throw new ArgumentException("offset"); } if (count <= 0 || (offset + count) > buffer.Length) { throw new ArgumentException("count"); } GCHandle handle = GCHandle.Alloc(buffer, GCHandleType.Pinned); int read = AudioDevice.ALDevice.CaptureSamples( nativeMic, handle.AddrOfPinnedObject() + offset, count ); handle.Free(); return read; } public TimeSpan GetSampleDuration(int sizeInBytes) { return SoundEffect.GetSampleDuration( sizeInBytes, SampleRate, AudioChannels.Mono ); } public int GetSampleSizeInBytes(TimeSpan duration) { return SoundEffect.GetSampleSizeInBytes( duration, SampleRate, AudioChannels.Mono ); } public void Start() { if (State == MicrophoneState.Stopped) { nativeMic = AudioDevice.ALDevice.StartDeviceCapture( Name, SampleRate, GetSampleSizeInBytes(bufferDuration) ); if (nativeMic == IntPtr.Zero) { throw new NoMicrophoneConnectedException(Name); } AudioDevice.ActiveMics.Add(this); State = MicrophoneState.Started; } } public void Stop() { if (State == MicrophoneState.Started) { AudioDevice.ActiveMics.Remove(this); AudioDevice.ALDevice.StopDeviceCapture(nativeMic); nativeMic = IntPtr.Zero; State = MicrophoneState.Stopped; } } #endregion #region Internal Methods internal void CheckBuffer() { if ( BufferReady != null && AudioDevice.ALDevice.CaptureHasSamples(nativeMic) ) { BufferReady(this, EventArgs.Empty); } } #endregion }} |
