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我们在开发Windows客户端程序时,有时需要实现录音的功能,比如使用语音识别时。本文中的代码通过DLL导入调用系统API实现了录制16kHz、16bit位宽的单声道wav格式录音。该代码已用于ASRT语音识别客户端SDK(C# UWP版):
https://github.com/nl8590687/ASRT_SpeechClient_UWP
核心类:WavRecorder类实现 (C#)
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using Windows.UI.Xaml.Controls; using Windows.Media.Capture; using Windows.Media.MediaProperties; using Windows.Storage; using Windows.Storage.Streams; using Windows.UI.Core; using Windows.ApplicationModel; namespace ailemon { class AudioRecorder { private MediaCapture _mediaCapture; private InMemoryRandomAccessStream _memoryBuffer; public bool IsRecording { get; set; } private const string DEFAULT_AUDIO_FILENAME = "1.wav"; private string _fileName; public AudioRecorder() { } public void Initialize() { _memoryBuffer = new InMemoryRandomAccessStream(); } public async void Record() { if (IsRecording) { throw new InvalidOperationException("Recording already in progress!"); } Initialize(); //await DeleteExistingFile(); MediaCaptureInitializationSettings settings = new MediaCaptureInitializationSettings { StreamingCaptureMode = StreamingCaptureMode.Audio }; settings.AudioProcessing = Windows.Media.AudioProcessing.Raw; _mediaCapture = new MediaCapture(); await _mediaCapture.InitializeAsync(settings); await _mediaCapture.StartRecordToStreamAsync( MediaEncodingProfile.CreateWav(AudioEncodingQuality.Low), _memoryBuffer); //MediaEncodingProfile.CreateMp3(AudioEncodingQuality.Auto) IsRecording = true; } public async void StopRecording() { if(_mediaCapture != null) { await _mediaCapture.StopRecordAsync(); IsRecording = false; //SaveAudioToFile(); } } public async Task<bool> SaveAudioToFile(string filename = DEFAULT_AUDIO_FILENAME) { IRandomAccessStream audioStream = _memoryBuffer.CloneStream(); //StorageFolder storageFolder = Package.Current.InstalledLocation; StorageFolder storageFolder = ApplicationData.Current.LocalFolder; StorageFile storageFile = await storageFolder.CreateFileAsync( filename, CreationCollisionOption.GenerateUniqueName); this._fileName = storageFile.Name; using (IRandomAccessStream fileStream = await storageFile.OpenAsync(FileAccessMode.ReadWrite)) { await RandomAccessStream.CopyAndCloseAsync( audioStream.GetInputStreamAt(0), fileStream.GetOutputStreamAt(0)); await audioStream.FlushAsync(); audioStream.Dispose(); } return true; } public void Play() { MediaElement playbackMediaElement = new MediaElement(); playbackMediaElement.SetSource(_memoryBuffer, "MP3"); playbackMediaElement.Play(); } public async Task PlayFromDisk(CoreDispatcher dispatcher) { await dispatcher.RunAsync(CoreDispatcherPriority.Normal, async () => { MediaElement playbackMediaElement = new MediaElement(); StorageFolder storageFolder = Package.Current.InstalledLocation; StorageFile storageFile = await storageFolder.GetFileAsync(this._fileName); IRandomAccessStream stream = await storageFile.OpenAsync(FileAccessMode.Read); playbackMediaElement.SetSource(stream, storageFile.FileType); playbackMediaElement.Play(); }); } public void Close() { _mediaCapture.Dispose(); _memoryBuffer.Dispose(); } } }
调用样例:
using ailemon; //引用命名空间 AudioRecorder audioRecorder = new AudioRecorder();//定义并实例化类 audioRecorder.Record(); //录音 audioRecorder.StopRecording(); //停止录音 string filename = "speechfile.wav"; audioRecorder.SaveAudioToFile(filename); //保存录音文件 audioRecorder.Close(); //关闭录音内存流
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