ReceiveRealTimeSpeechToText.cs
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using System.Management.Automation;
using NAudio.Wave; using Whisper.net; using Whisper.net.Ggml; using System.Management; using System.Collections.Concurrent; namespace GenXdev.Helpers { [Cmdlet(VerbsCommunications.Receive, "RealTimeSpeechToText")] public class ReceiveRealTimeSpeechToText : PSCmdlet { #region Cmdlet Parameters [Parameter(Mandatory = false, HelpMessage = "Path to the model file")] public string ModelFileDirectoryPath { get; set; } [Parameter(Mandatory = false, HelpMessage = "Whether to use desktop audio capture instead of microphone")] public SwitchParameter UseDesktopAudioCapture { get; set; } [Parameter(Mandatory = false, HelpMessage = "Audio device name or GUID (supports wildcards, picks first match)")] public string AudioDevice { get; set; } [Parameter(Mandatory = false, HelpMessage = "Returns objects instead of strings")] public SwitchParameter Passthru { get; set; } [Parameter(Mandatory = false, HelpMessage = "Whether to include token timestamps")] public SwitchParameter WithTokenTimestamps { get; set; } [Parameter(Mandatory = false, HelpMessage = "Sum threshold for token timestamps, defaults to 0.5")] public float TokenTimestampsSumThreshold { get; set; } = 0.5f; [Parameter(Mandatory = false, HelpMessage = "Whether to split on word boundaries")] public SwitchParameter SplitOnWord { get; set; } [Parameter(Mandatory = false, HelpMessage = "Maximum number of tokens per segment")] public int? MaxTokensPerSegment { get; set; } [Parameter(Mandatory = false, HelpMessage = "Whether to ignore silence (will mess up timestamps)")] public SwitchParameter IgnoreSilence { get; set; } [Parameter(Mandatory = false, HelpMessage = "Maximum duration of silence before automatically stopping recording")] public TimeSpan? MaxDurationOfSilence { get; set; } [Parameter(Mandatory = false, HelpMessage = "Silence detect threshold (0..32767 defaults to 30)")] [ValidateRange(0, 32767)] public int? SilenceThreshold { get; set; } [Parameter(Mandatory = false, HelpMessage = "Sets the language to detect, defaults to 'en'")] public string Language { get; set; } = "en"; [Parameter(Mandatory = false, HelpMessage = "Number of CPU threads to use, defaults to 0 (auto)")] public int CpuThreads { get; set; } = 0; [Parameter(Mandatory = false, HelpMessage = "Temperature for speech detection")] [ValidateRange(0, 1)] public float? Temperature { get; set; } [Parameter(Mandatory = false, HelpMessage = "Temperature increment")] [ValidateRange(0, 1)] public float? TemperatureInc { get; set; } [Parameter(Mandatory = false, HelpMessage = "Whether to translate the output")] public SwitchParameter WithTranslate { get; set; } [Parameter(Mandatory = false, HelpMessage = "Prompt to use for the model")] public string Prompt { get; set; } [Parameter(Mandatory = false, HelpMessage = "Regex to suppress tokens from the output")] public string SuppressRegex { get; set; } = null; [Parameter(Mandatory = false, HelpMessage = "Whether to show progress")] public SwitchParameter WithProgress { get; set; } [Parameter(Mandatory = false, HelpMessage = "Size of the audio context")] public int? AudioContextSize { get; set; } [Parameter(Mandatory = false, HelpMessage = "Whether to NOT suppress blank lines")] public SwitchParameter DontSuppressBlank { get; set; } [Parameter(Mandatory = false, HelpMessage = "Maximum duration of the audio")] public TimeSpan? MaxDuration { get; set; } [Parameter(Mandatory = false, HelpMessage = "Offset for the audio")] public TimeSpan? Offset { get; set; } [Parameter(Mandatory = false, HelpMessage = "Maximum number of last text tokens")] public int? MaxLastTextTokens { get; set; } [Parameter(Mandatory = false, HelpMessage = "Whether to use single segment only")] public SwitchParameter SingleSegmentOnly { get; set; } [Parameter(Mandatory = false, HelpMessage = "Whether to print special tokens")] public SwitchParameter PrintSpecialTokens { get; set; } [Parameter(Mandatory = false, HelpMessage = "Maximum segment length")] public int? MaxSegmentLength { get; set; } [Parameter(Mandatory = false, HelpMessage = "Start timestamps at this moment")] public TimeSpan? MaxInitialTimestamp { get; set; } [Parameter(Mandatory = false, HelpMessage = "Length penalty")] [ValidateRange(0, 1)] public float? LengthPenalty { get; set; } [Parameter(Mandatory = false, HelpMessage = "Entropy threshold")] [ValidateRange(0, 1)] public float? EntropyThreshold { get; set; } [Parameter(Mandatory = false, HelpMessage = "Log probability threshold")] [ValidateRange(0, 1)] public float? LogProbThreshold { get; set; } [Parameter(Mandatory = false, HelpMessage = "No speech threshold")] [ValidateRange(0, 1)] public float? NoSpeechThreshold { get; set; } [Parameter(Mandatory = false, HelpMessage = "Don't use context")] public SwitchParameter NoContext { get; set; } [Parameter(Mandatory = false, HelpMessage = "Use beam search sampling strategy")] public SwitchParameter WithBeamSearchSamplingStrategy { get; set; } [Parameter(Mandatory = false, HelpMessage = "Whisper model type to use, defaults to LargeV3Turbo")] public GgmlType ModelType { get; set; } = GgmlType.Small; #endregion private readonly ConcurrentQueue<SegmentData> _results = new(); private readonly ConcurrentQueue<byte[]> _bufferQueue = new(); private readonly ConcurrentQueue<ErrorRecord> _errorQueue = new(); private readonly ConcurrentQueue<string> _verboseQueue = new(); private CancellationTokenSource _cts; private WhisperProcessor _processor; private WhisperFactory _whisperFactory; // Keep reference for proper disposal private bool _isRecordingStarted = true; private bool _isDisposed = false; private readonly object _disposeLock = new object(); private Task _processingTask; private int _audioCallbackCount = 0; private int _bufferQueueCount = 0; protected override void BeginProcessing() { base.BeginProcessing(); if (string.IsNullOrEmpty(ModelFileDirectoryPath) || !Directory.Exists(ModelFileDirectoryPath)) { // With this: var localAppData = System.Environment.GetEnvironmentVariable("LOCALAPPDATA"); if (!string.IsNullOrEmpty(localAppData)) { ModelFileDirectoryPath = Path.Combine(localAppData, "GenXdev.PowerShell"); } if (!Directory.Exists(ModelFileDirectoryPath)) { try { Directory.CreateDirectory(ModelFileDirectoryPath); } catch (Exception ex) { ThrowTerminatingError(new ErrorRecord(ex, "ModelPathCreationFailed", ErrorCategory.ResourceUnavailable, ModelFileDirectoryPath)); } } } WriteVerbose($"ModelFileDirectoryPath: {ModelFileDirectoryPath}"); WriteVerbose($"UseDesktopAudioCapture: {UseDesktopAudioCapture}"); WriteVerbose($"Passthru: {Passthru}"); WriteVerbose($"WithTokenTimestamps: {WithTokenTimestamps}"); WriteVerbose($"TokenTimestampsSumThreshold: {TokenTimestampsSumThreshold}"); WriteVerbose($"SplitOnWord: {SplitOnWord}"); WriteVerbose($"MaxTokensPerSegment: {MaxTokensPerSegment}"); WriteVerbose($"IgnoreSilence: {IgnoreSilence}"); WriteVerbose($"MaxDurationOfSilence: {MaxDurationOfSilence}"); WriteVerbose($"SilenceThreshold: {SilenceThreshold}"); WriteVerbose($"Language: {Language}"); WriteVerbose($"CpuThreads: {CpuThreads}"); WriteVerbose($"Temperature: {Temperature}"); WriteVerbose($"TemperatureInc: {TemperatureInc}"); WriteVerbose($"WithTranslate: {WithTranslate}"); WriteVerbose($"Prompt: {Prompt}"); WriteVerbose($"SuppressRegex: {SuppressRegex}"); WriteVerbose($"WithProgress: {WithProgress}"); WriteVerbose($"AudioContextSize: {AudioContextSize}"); WriteVerbose($"DontSuppressBlank: {DontSuppressBlank}"); WriteVerbose($"MaxDuration: {MaxDuration}"); WriteVerbose($"Offset: {Offset}"); WriteVerbose($"MaxLastTextTokens: {MaxLastTextTokens}"); WriteVerbose($"SingleSegmentOnly: {SingleSegmentOnly}"); WriteVerbose($"PrintSpecialTokens: {PrintSpecialTokens}"); WriteVerbose($"MaxSegmentLength: {MaxSegmentLength}"); WriteVerbose($"MaxInitialTimestamp: {MaxInitialTimestamp}"); WriteVerbose($"LengthPenalty: {LengthPenalty}"); WriteVerbose($"EntropyThreshold: {EntropyThreshold}"); WriteVerbose($"LogProbThreshold: {LogProbThreshold}"); WriteVerbose($"NoSpeechThreshold: {NoSpeechThreshold}"); WriteVerbose($"NoContext: {NoContext}"); WriteVerbose($"WithBeamSearchSamplingStrategy: {WithBeamSearchSamplingStrategy}"); WriteVerbose($"ModelType: {ModelType}"); _cts = new CancellationTokenSource(); } protected override void ProcessRecord() { base.ProcessRecord(); // Initialize Whisper var ggmlType = ModelType; var modelFileName = Path.GetFullPath(Path.Combine(ModelFileDirectoryPath, GetModelFileName(ModelType))); if (!File.Exists(modelFileName)) { DownloadModel(modelFileName, ggmlType).GetAwaiter().GetResult(); } _whisperFactory = WhisperFactory.FromPath(modelFileName); var builder = ConfigureWhisperBuilder(_whisperFactory.CreateBuilder()); _processor = builder.Build(); IWaveIn waveIn = CreateAudioInput(); using (waveIn) { waveIn.WaveFormat = new WaveFormat(16000, 1); var processingTask = Task.Run(() => ProcessAudioBuffer()); _processingTask = processingTask; // Store reference for proper disposal // Variables for silence detection - matching exactly the GetSpeechToText implementation bool hadAudio = false; bool everHadAudio = false; double totalSilenceSeconds = 0; double seconds = 0; double sum = 0; long count = 0; int threshold = SilenceThreshold.HasValue ? SilenceThreshold.Value : 30; using MemoryStream wavBufferStream = new MemoryStream(); object syncLock = new object(); waveIn.DataAvailable += (sender, args) => { if (!_isRecordingStarted || _isDisposed) return; _audioCallbackCount++; lock (syncLock) { if (!_isRecordingStarted || _isDisposed) return; // Validate buffer bounds before processing if (args.Buffer == null || args.BytesRecorded <= 0 || args.BytesRecorded > args.Buffer.Length) { return; } if (MaxDurationOfSilence.HasValue || IgnoreSilence.IsPresent) { seconds += args.BytesRecorded / 32000d; count += args.BytesRecorded / 2; unsafe { fixed (byte* buffer = args.Buffer) { var floatBuffer = (Int16*)buffer; var sampleCount = Math.Min(args.BytesRecorded / 2, args.Buffer.Length / 2); for (var i = 0; i < sampleCount; i++) { sum += Math.Abs(floatBuffer[i]); } } } wavBufferStream.Write(args.Buffer, 0, args.BytesRecorded); wavBufferStream.Flush(); var current = (sum / count); if (current > threshold) { hadAudio = true; totalSilenceSeconds = 0; everHadAudio = true; } if (seconds > 0.85) { if (!_isRecordingStarted) return; if (current < threshold) { totalSilenceSeconds += seconds; if (everHadAudio && MaxDurationOfSilence.HasValue && (totalSilenceSeconds > MaxDurationOfSilence.Value.TotalSeconds)) { // Max duration of silence reached _isRecordingStarted = false; _cts.Cancel(); return; } if (IgnoreSilence.IsPresent && !hadAudio) { // Ignoring silence count = 0; sum = 0; seconds = 0; hadAudio = false; wavBufferStream.Position = 0; wavBufferStream.SetLength(0); return; } hadAudio = false; } // Add buffer to queue for processing wavBufferStream.Position = 0; var buffer = new byte[wavBufferStream.Length]; wavBufferStream.Read(buffer, 0, buffer.Length); _bufferQueue.Enqueue(buffer); _bufferQueueCount++; wavBufferStream.Position = 0; wavBufferStream.SetLength(0); count = 0; sum = 0; seconds = 0; } } else { // When not using silence detection, directly add to buffer queue if (args.BytesRecorded > 0 && args.Buffer != null) { var buffer = new byte[args.BytesRecorded]; Array.Copy(args.Buffer, buffer, args.BytesRecorded); _bufferQueue.Enqueue(buffer); _bufferQueueCount++; } } } }; waveIn.StartRecording(); Console.WriteLine("Recording started. Press Q to stop..."); var startTime = System.DateTime.UtcNow; while (!_cts.IsCancellationRequested && _isRecordingStarted) { try { if (Console.KeyAvailable) { var keyInfo = Console.ReadKey(true); if (keyInfo.Key == ConsoleKey.Q) { _isRecordingStarted = false; _cts.Cancel(); break; } } if (MaxDuration.HasValue && (System.DateTime.UtcNow - startTime) > MaxDuration.Value) { Console.WriteLine($"Max recording time of {MaxDuration.Value.TotalSeconds} seconds reached."); _isRecordingStarted = false; _cts.Cancel(); break; } // Process all queued messages in the main thread while (_errorQueue.TryDequeue(out var errorRecord)) { WriteError(errorRecord); } while (_verboseQueue.TryDequeue(out var verboseMessage)) { WriteVerbose (verboseMessage); } while (_results.TryDequeue(out var segment)) { WriteObject(Passthru ? segment : segment.Text.Trim()); } Thread.Sleep(100); } catch (InvalidOperationException) { // Console input not available, continue Thread.Sleep(100); } catch (Exception ex) { WriteError(new ErrorRecord(ex, "MainLoopError", ErrorCategory.OperationStopped, null)); break; } } // Move cursor up one line and clear it for consistent UI // Console.WriteLine("Recording stopped, processing remaining audio..."); try { waveIn.StopRecording(); } catch (Exception ex) { WriteVerbose($"Error stopping wave input: {ex.Message}"); } // Wait for processing to complete with proper timeout and error handling bool taskCompleted = false; try { // First try to wait gracefully taskCompleted = processingTask.Wait(TimeSpan.FromSeconds(5)); if (!taskCompleted) { // If task doesn't complete, cancel and wait a bit more _cts.Cancel(); taskCompleted = processingTask.Wait(TimeSpan.FromSeconds(3)); } } catch (AggregateException ex) { // Handle task exceptions foreach (var innerEx in ex.InnerExceptions) { if (!(innerEx is OperationCanceledException)) { WriteVerbose($"Processing task error: {innerEx.Message}"); } } } catch (Exception ex) { WriteVerbose($"Error waiting for processing task: {ex.Message}"); } // Process any remaining results regardless of task completion int timeout = 0; while (timeout < 50) // Max 5 seconds { bool hasResults = false; // Process all queued messages in the main thread during cleanup while (_errorQueue.TryDequeue(out var errorRecord)) { WriteError(errorRecord); hasResults = true; } while (_verboseQueue.TryDequeue(out var verboseMessage)) { hasResults = true; } while (_results.TryDequeue(out var segment)) { WriteObject(Passthru ? segment : segment.Text.Trim()); hasResults = true; } if (!hasResults && taskCompleted) { break; // No more results and task is done } Thread.Sleep(100); timeout++; } } } private IWaveIn CreateAudioInput() { if (UseDesktopAudioCapture.IsPresent) { if (!string.IsNullOrWhiteSpace(AudioDevice)) { WriteVerbose($"Looking for desktop audio device matching: {AudioDevice}"); // For desktop audio capture, we use the default device but can log the attempt WriteWarning($"Desktop audio device selection by name is not supported in this NAudio version. Using default desktop audio capture."); } return new WasapiLoopbackCapture(); } else { if (!string.IsNullOrWhiteSpace(AudioDevice)) { // Find microphone device by name/GUID with wildcard support WriteVerbose($"Looking for microphone device matching: {AudioDevice}"); for (int i = 0; i < WaveIn.DeviceCount; i++) { try { var deviceInfo = WaveIn.GetCapabilities(i); if (IsDeviceMatch(deviceInfo.ProductName, AudioDevice) || IsDeviceMatch(deviceInfo.ProductGuid.ToString(), AudioDevice)) { WriteVerbose($"Selected microphone device: {deviceInfo.ProductName}"); var waveIn = new WaveInEvent { DeviceNumber = i }; return waveIn; } } catch (Exception ex) { WriteVerbose($"Could not check device {i}: {ex.Message}"); } } WriteWarning($"Microphone device '{AudioDevice}' not found, using default"); } return new WaveInEvent(); } } private bool IsDeviceMatch(string deviceName, string pattern) { if (string.IsNullOrWhiteSpace(deviceName) || string.IsNullOrWhiteSpace(pattern)) return false; // Convert wildcards to regex pattern string regexPattern = "^" + System.Text.RegularExpressions.Regex.Escape(pattern) .Replace("\\*", ".*") .Replace("\\?", ".") + "$"; return System.Text.RegularExpressions.Regex.IsMatch(deviceName, regexPattern, System.Text.RegularExpressions.RegexOptions.IgnoreCase); } private WhisperProcessorBuilder ConfigureWhisperBuilder(WhisperProcessorBuilder builder) { int physicalCoreCount = 0; var searcher = new ManagementObjectSearcher("select NumberOfCores from Win32_Processor"); foreach (var item in searcher.Get()) { physicalCoreCount += Convert.ToInt32(item["NumberOfCores"]); } builder.WithLanguage(Language) .WithThreads(CpuThreads > 0 ? CpuThreads : physicalCoreCount); // Improved speech detection settings if (Temperature.HasValue) { builder.WithTemperature(Temperature.Value); } else { builder.WithTemperature(0.0f); // Lower temperature for more consistent results } if (TemperatureInc.HasValue) builder.WithTemperatureInc(TemperatureInc.Value); if (WithTokenTimestamps.IsPresent) builder.WithTokenTimestamps().WithTokenTimestampsSumThreshold(TokenTimestampsSumThreshold); if (WithTranslate.IsPresent) builder.WithTranslate(); if (!string.IsNullOrWhiteSpace(Prompt)) builder.WithPrompt(Prompt); if (!string.IsNullOrWhiteSpace(SuppressRegex)) builder.WithSuppressRegex(SuppressRegex); if (WithProgress.IsPresent) builder.WithProgressHandler(progress => WriteProgress(new ProgressRecord(1, "Processing", $"Progress: {progress}%") { PercentComplete = progress })); if (SplitOnWord.IsPresent) builder.SplitOnWord(); if (MaxTokensPerSegment.HasValue) builder.WithMaxTokensPerSegment(MaxTokensPerSegment.Value); // Improved silence/speech detection if (IgnoreSilence.IsPresent) { builder.WithNoSpeechThreshold(0.4f); // More sensitive to speech (lower = more sensitive) } else if (NoSpeechThreshold.HasValue) { builder.WithNoSpeechThreshold(NoSpeechThreshold.Value); } else { builder.WithNoSpeechThreshold(0.6f); // Default Whisper threshold } if (AudioContextSize.HasValue) builder.WithAudioContextSize(AudioContextSize.Value); if (DontSuppressBlank.IsPresent) builder.WithoutSuppressBlank(); if (MaxDuration.HasValue) builder.WithDuration(MaxDuration.Value); if (Offset.HasValue) builder.WithOffset(Offset.Value); if (MaxLastTextTokens.HasValue) builder.WithMaxLastTextTokens(MaxLastTextTokens.Value); if (SingleSegmentOnly.IsPresent) builder.WithSingleSegment(); if (PrintSpecialTokens.IsPresent) builder.WithPrintSpecialTokens(); if (MaxSegmentLength.HasValue) builder.WithMaxSegmentLength(MaxSegmentLength.Value); if (MaxInitialTimestamp.HasValue) builder.WithMaxInitialTs((int)MaxInitialTimestamp.Value.TotalSeconds); if (LengthPenalty.HasValue) builder.WithLengthPenalty(LengthPenalty.Value); if (EntropyThreshold.HasValue) builder.WithEntropyThreshold(EntropyThreshold.Value); if (LogProbThreshold.HasValue) builder.WithLogProbThreshold(LogProbThreshold.Value); if (NoContext.IsPresent) builder.WithNoContext(); if (WithBeamSearchSamplingStrategy.IsPresent) builder.WithBeamSearchSamplingStrategy(); return builder; } private async Task ProcessAudioBuffer() { using var processingStream = new MemoryStream(); bool isProcessing = false; int processedCount = 0; try { while ((!_cts.IsCancellationRequested || _bufferQueue.Count > 0) && !_isDisposed) { try { if (_bufferQueue.TryDequeue(out var buffer)) { // Validate buffer before processing if (buffer == null || buffer.Length == 0) { continue; } processingStream.Write(buffer, 0, buffer.Length); // Increased threshold for better speech recognition // 48000 bytes = ~3 seconds of audio (16kHz * 1 channel * 2 bytes * 3 seconds) if (!isProcessing && processingStream.Length >= 48000) { var audioDurationSeconds = processingStream.Length / 32000.0; // 16kHz * 2 bytes isProcessing = true; // Convert raw PCM data to WAV format that Whisper can understand using var wavStream = ConvertPcmToWav(processingStream.ToArray(), 16000, 1, 16); wavStream.Position = 0; try { int segmentCount = 0; await foreach (var segment in _processor.ProcessAsync(wavStream, _cts.Token)) { if (_cts.IsCancellationRequested || _isDisposed) { break; } segmentCount++; if (!string.IsNullOrWhiteSpace(segment.Text)) { if (!(segment.Text.Trim("\r\n\t ".ToCharArray()) == "[BLANK_AUDIO]")) { _results.Enqueue(segment); } } } } catch (OperationCanceledException) { break; } catch (Exception ex) when (!_isDisposed) { // Queue error for main thread to process _errorQueue.Enqueue(new ErrorRecord(ex, "WhisperProcessingError", ErrorCategory.OperationStopped, null)); } processingStream.SetLength(0); isProcessing = false; } } else { // If we have data but not enough for a full segment, process it anyway when stopping if (!_isRecordingStarted && processingStream.Length > 0 && !isProcessing && !_isDisposed) { var audioDurationSeconds = processingStream.Length / 32000.0; isProcessing = true; // Convert raw PCM data to WAV format for final processing using var wavStream = ConvertPcmToWav(processingStream.ToArray(), 16000, 1, 16); wavStream.Position = 0; try { int segmentCount = 0; await foreach (var segment in _processor.ProcessAsync(wavStream, _cts.Token)) { if (_cts.IsCancellationRequested || _isDisposed) { break; } segmentCount++; if (!string.IsNullOrWhiteSpace(segment.Text)) { _results.Enqueue(segment); } } } catch (OperationCanceledException) { break; } catch (Exception ex) when (!_isDisposed) { // Queue error for main thread to process _errorQueue.Enqueue(new ErrorRecord(ex, "FinalProcessingError", ErrorCategory.OperationStopped, null)); } processingStream.SetLength(0); isProcessing = false; } await Task.Delay(50, _cts.Token); } } catch (OperationCanceledException) { break; } catch (Exception ex) when (!(ex is OperationCanceledException) && !_isDisposed) { // Queue error for main thread to process instead of calling WriteError directly _errorQueue.Enqueue(new ErrorRecord(ex, "ProcessingError", ErrorCategory.OperationStopped, null)); break; } } } catch (Exception ex) when (!_isDisposed) { } } private MemoryStream ConvertPcmToWav(byte[] pcmData, int sampleRate, int channels, int bitsPerSample) { var wavStream = new MemoryStream(); int bytesPerSample = bitsPerSample / 8; int byteRate = sampleRate * channels * bytesPerSample; int blockAlign = channels * bytesPerSample; // Write WAV header // "RIFF" chunk descriptor wavStream.Write(System.Text.Encoding.ASCII.GetBytes("RIFF"), 0, 4); wavStream.Write(BitConverter.GetBytes(36 + pcmData.Length), 0, 4); // File size - 8 wavStream.Write(System.Text.Encoding.ASCII.GetBytes("WAVE"), 0, 4); // "fmt " sub-chunk wavStream.Write(System.Text.Encoding.ASCII.GetBytes("fmt "), 0, 4); wavStream.Write(BitConverter.GetBytes(16), 0, 4); // Sub-chunk size wavStream.Write(BitConverter.GetBytes((short)1), 0, 2); // Audio format (1 = PCM) wavStream.Write(BitConverter.GetBytes((short)channels), 0, 2); // Number of channels wavStream.Write(BitConverter.GetBytes(sampleRate), 0, 4); // Sample rate wavStream.Write(BitConverter.GetBytes(byteRate), 0, 4); // Byte rate wavStream.Write(BitConverter.GetBytes((short)blockAlign), 0, 2); // Block align wavStream.Write(BitConverter.GetBytes((short)bitsPerSample), 0, 2); // Bits per sample // "data" sub-chunk wavStream.Write(System.Text.Encoding.ASCII.GetBytes("data"), 0, 4); wavStream.Write(BitConverter.GetBytes(pcmData.Length), 0, 4); // Data size wavStream.Write(pcmData, 0, pcmData.Length); // The actual audio data return wavStream; } protected override void EndProcessing() { lock (_disposeLock) { if (_isDisposed) return; _isDisposed = true; } try { // Stop recording first to prevent new audio data _isRecordingStarted = false; // Cancel any ongoing operations if (_cts != null && !_cts.IsCancellationRequested) { _cts.Cancel(); } // Wait for processing task to complete with timeout if (_processingTask != null && !_processingTask.IsCompleted) { try { var completed = _processingTask.Wait(TimeSpan.FromSeconds(50)); if (!completed) { WriteVerbose("Processing task did not complete within timeout"); } } catch (AggregateException ex) { // Expected when task is cancelled WriteVerbose($"Processing task cancelled: {ex.InnerExceptions.FirstOrDefault()?.Message}"); } catch (Exception ex) { WriteVerbose($"Error waiting for processing task: {ex.Message}"); } } // Dispose Whisper processor first (it uses the factory) if (_processor != null) { try { // Properly dispose async resources if (_processor is IAsyncDisposable asyncDisposable) { // Wait for async disposal to complete asyncDisposable.DisposeAsync().AsTask().Wait(TimeSpan.FromSeconds(50)); } else if (_processor is IDisposable disposable) { disposable.Dispose(); } } catch (Exception ex) { WriteVerbose($"Error disposing Whisper processor: {ex.Message}"); } finally { _processor = null; } } // Then dispose Whisper factory if (_whisperFactory != null) { try { _whisperFactory.Dispose(); } catch (Exception ex) { WriteVerbose($"Error disposing Whisper factory: {ex.Message}"); } finally { _whisperFactory = null; } } // Finally dispose cancellation token source if (_cts != null) { try { _cts.Dispose(); } catch (Exception ex) { WriteVerbose($"Error disposing cancellation token source: {ex.Message}"); } finally { _cts = null; } } } catch (Exception ex) { WriteVerbose($"Error in EndProcessing: {ex.Message}"); } base.EndProcessing(); } private static async Task DownloadModel(string fileName, GgmlType ggmlType) { Console.WriteLine($"Downloading Model {fileName}"); using var modelStream = await WhisperGgmlDownloader.GetGgmlModelAsync(ggmlType); using var fileWriter = File.OpenWrite(fileName); await modelStream.CopyToAsync(fileWriter); } private static string GetModelFileName(GgmlType modelType) { return $"ggml-{modelType}.bin"; } } } |