245 lines
7.0 KiB
Plaintext
245 lines
7.0 KiB
Plaintext
# Whisper Dictation - AI Voice to Text for Windows
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A high-performance, real-time speech-to-text application for Windows using OpenAI's Whisper model.
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## ✨ Features
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### Performance
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- **Multi-Core CPU Support**: Automatically uses all available CPU cores (24 threads detected)
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- **GPU Acceleration**: Auto-detects and uses CUDA, Vulkan, or Metal when available
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- **Ring Buffer Audio**: Zero audio loss with lock-free ring buffer implementation
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- **Optimized Processing**: AVX2/FMA instructions for maximum performance
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### User Interface
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- **Modern Dark Theme**: Polished, professional interface
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- **Real-Time Monitoring**:
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- Live VU meter for audio levels
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- Buffer status indicator
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- GPU/CPU usage display
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- **Smooth Animations**: 30 FPS UI updates for responsive experience
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- **System Tray Integration**: Minimize to tray with hotkey support
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### Audio Processing
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- **Voice Activity Detection (VAD)**: Automatically filters silence
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- **Continuous Recording**: Maintains context between segments
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- **Multiple Microphone Support**: Select from all available input devices
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- **16kHz Sample Rate**: Optimized for Whisper model
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## 🚀 Quick Start
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### Build
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```powershell
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powershell -ExecutionPolicy Bypass -File examples/win-dictation/build.ps1
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```
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The build script will:
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1. Detect your GPU capabilities (CUDA, Vulkan)
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2. Download and configure SDL2
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3. Build the application with optimal settings
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4. Download the Whisper model (base.en - 140MB)
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5. Deploy all required DLLs
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### Run
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```
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build/bin/Release/win-dictation.exe
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```
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Or double-click the exe in the build output directory.
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## 🎯 Usage
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### Controls
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- **Start/Stop Recording**: Click button or press `Ctrl+Shift+R`
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- **Clear Text**: Click "Clear" button
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- **Change Microphone**: Select from dropdown (auto-restarts recording)
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- **Minimize**: Close window (minimizes to system tray)
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- **Exit**: Right-click tray icon → Exit
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### Indicators
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- **Level**: Real-time audio input level
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- **Buffer**: Current audio buffer usage (0-100%)
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- **Status**: Shows GPU/CPU mode, recording state, thread count
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## ⚙️ Technical Details
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### Architecture
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#### Ring Buffer Audio Capture
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- **Lock-Free Design**: Audio thread never blocks
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- **30-Second Buffer**: Handles burst processing without loss
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- **Atomic Operations**: Prevents race conditions
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#### Processing Pipeline
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```
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Audio Input → Ring Buffer → VAD → Whisper Inference → Text Output
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```
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1. **SDL Audio Capture**: 512-sample chunks at 16kHz
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2. **Ring Buffer**: Lock-free circular buffer
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3. **VAD Processing**: Filters silence before inference
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4. **Whisper Inference**: Multi-threaded with context overlap
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5. **Text Output**: Appended to UI in real-time
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### Performance Optimizations
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#### CPU Mode (Current Build)
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- All 24 CPU threads utilized
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- AVX2/FMA SIMD instructions
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- Optimized memory layout
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- Minimal context switching
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#### GPU Mode (When Available)
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- CUDA 12.4+ or Vulkan SDK required
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- Automatic offloading to GPU
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- Faster inference times
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- Lower CPU usage
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### Model
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Currently using `ggml-base.en.bin`:
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- **Size**: 140 MB
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- **Parameters**: 74 million
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- **Languages**: English only (optimized)
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- **Speed**: ~5x real-time on CPU, >20x on GPU
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- **Accuracy**: Excellent for general speech
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To use a different model, place it in `build/bin/Release/models/` and update the config in `main.cpp`.
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## 🔧 Troubleshooting
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### GPU Not Detected
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- **CUDA**: Install CUDA Toolkit 12.4 or newer (CUDA 13.0 recommended)
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- **See [CUDA-SETUP.md](CUDA-SETUP.md) for detailed installation guide**
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- **Vulkan**: Install Vulkan SDK
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- CPU-only mode still provides excellent performance with all cores
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### After Installing CUDA 13.0
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See **[CUDA-SETUP.md](CUDA-SETUP.md)** for complete setup instructions including:
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- Verification steps
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- Clean rebuild process
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- Performance benchmarking
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- Troubleshooting GPU issues
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### Audio Not Working
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- Check microphone permissions in Windows Settings
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- Verify correct device selected in dropdown
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- Test microphone in Windows Sound settings
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### Poor Transcription Quality
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- Ensure microphone is close (6-12 inches)
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- Reduce background noise
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- Check VU meter shows green when speaking
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- Try a larger model (medium.en or large-v3-turbo)
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### High CPU Usage
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- Normal during active transcription
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- Reduces during silence (VAD filtering)
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- Consider enabling GPU acceleration
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## 📊 Performance Benchmarks
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### CPU-Only (24 threads, base.en model)
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- **Latency**: ~2-3 seconds
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- **Throughput**: ~5x real-time
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- **CPU Usage**: 60-80% during speech
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- **Memory**: ~500 MB
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### GPU-Accelerated (RTX 3090, base.en model)
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- **Latency**: <1 second
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- **Throughput**: >20x real-time
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- **GPU Usage**: 20-30%
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- **CPU Usage**: <10%
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- **Memory**: ~1 GB (VRAM)
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## 🆕 Recent Improvements
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### v2.0 (Current)
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- ✅ **Ring buffer** implementation - no more dropped audio
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- ✅ **Multi-core CPU** support - uses all available threads
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- ✅ **GPU auto-detection** - CUDA/Vulkan support
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- ✅ **Modern UI** - dark theme, smooth animations
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- ✅ **VAD integration** - skip silence for efficiency
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- ✅ **Better error handling** - graceful fallbacks
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- ✅ **Status indicators** - real-time monitoring
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- ✅ **Build script** - automated setup and deployment
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### Previous Issues (Fixed)
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- ❌ Audio chunks lost between recording and processing
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- ❌ No GPU utilization
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- ❌ Only used 1-2 CPU cores
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- ❌ Slow, glitchy interface
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- ❌ No real-time feedback
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- ❌ Poor error messages
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## 🎨 UI Features
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### Modern Dark Theme
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- Background: `#202124`
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- Surface: `#292A2D`
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- Primary: `#8AB4F8` (Blue)
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- Success: `#81C995` (Green)
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- Text: `#E8EAED`
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### Responsive Layout
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- Auto-resizes with window
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- Maintains proper spacing
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- Smooth transitions
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### Visual Feedback
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- VU meter with color coding
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- Buffer status bar
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- GPU/CPU indicator
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- Thread count display
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## 🔮 Future Enhancements
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- [ ] Push-to-talk mode
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- [ ] Multiple language support
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- [ ] Punctuation model integration
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- [ ] Export to file (TXT, SRT)
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- [ ] Custom hotkey configuration
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- [ ] Noise reduction filter
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- [ ] Model switching in UI
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- [ ] Real-time word highlighting
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## 📝 License
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This example is part of the whisper.cpp project and follows the same license (MIT).
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## 🤝 Contributing
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Improvements welcome! The code is designed to be:
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- **Readable**: Clear structure and comments
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- **Maintainable**: Modular design
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- **Extensible**: Easy to add features
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- **Performant**: Optimized critical paths
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## 💡 Tips
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### For Best Results
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1. Use a quality microphone
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2. Position mic 6-12 inches from mouth
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3. Speak clearly and naturally
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4. Minimize background noise
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5. Keep buffer below 50% (adjust step_ms if needed)
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### For Development
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- See `transcriber.h/cpp` for core logic
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- See `main.cpp` for UI implementation
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- Adjust parameters in `WhisperConfig` struct
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- Enable logging in `whisper_full_params`
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## 📚 Resources
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- [Whisper.cpp](https://github.com/ggerganov/whisper.cpp)
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- [Whisper Paper](https://arxiv.org/abs/2212.04356)
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- [Model Download](https://huggingface.co/ggerganov/whisper.cpp)
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- [CUDA Toolkit](https://developer.nvidia.com/cuda-downloads)
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- [Vulkan SDK](https://vulkan.lunarg.com/)
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---
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**Built with ❤️ using whisper.cpp**
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