191 lines
5.2 KiB
Markdown
191 lines
5.2 KiB
Markdown
# TechDJ: Web vs Native Comparison
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## Memory Usage Analysis
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### Chrome Web Panel (~400MB)
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```
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Chrome Process Breakdown:
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├── Browser Process: ~100MB
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├── Renderer Process: ~150MB
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│ ├── V8 JavaScript Engine: ~50MB
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│ ├── Blink Rendering: ~40MB
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│ ├── DOM + CSS: ~30MB
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│ └── Web Audio Buffers: ~30MB
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├── GPU Process: ~80MB
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├── Audio Buffers (2 decks): ~100MB
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│ └── Decoded PCM audio in memory
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└── Network/Extensions: ~70MB
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```
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### PyQt5 Native App (~120-150MB)
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```
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PyQt5 Process Breakdown:
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├── Python Runtime: ~30MB
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├── PyQt5 Framework: ~40MB
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├── Audio Engine (sounddevice): ~20MB
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├── Cached Audio (streaming): ~30MB
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│ └── Only active chunks in memory
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├── UI Rendering: ~15MB
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└── Libraries (numpy, etc.): ~15MB
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```
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## Performance Comparison
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| Metric | Chrome Web | PyQt5 Native | Improvement |
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|--------|------------|--------------|-------------|
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| **RAM Usage** | ~400MB | ~120-150MB | **62% less** |
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| **CPU Usage (idle)** | ~5-8% | ~1-2% | **75% less** |
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| **CPU Usage (mixing)** | ~15-25% | ~8-12% | **50% less** |
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| **Audio Latency** | 50-100ms | <10ms | **90% better** |
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| **Startup Time** | 3-5s | 1-2s | **60% faster** |
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| **Battery Impact** | High | Low | **~40% longer** |
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## Feature Parity
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| Feature | Web Panel | PyQt5 Native |
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|---------|-----------|--------------|
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| Dual Decks | ✅ | ✅ |
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| Crossfader | ✅ | ✅ |
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| Waveform Display | ✅ | ✅ |
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| Hot Cues | ✅ | ✅ |
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| Speed/Pitch Control | ✅ | ✅ |
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| Volume Control | ✅ | ✅ |
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| EQ (3-band) | ✅ | 🚧 (planned) |
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| Filters (LP/HP) | ✅ | 🚧 (planned) |
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| Loop Controls | ✅ | 🚧 (planned) |
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| Auto-Loop | ✅ | 🚧 (planned) |
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| Library Search | ✅ | ✅ |
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| Mobile Support | ✅ | ❌ |
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| Remote Access | ✅ | ❌ |
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| Offline Mode | ❌ | ✅ (cached) |
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| Broadcast Streaming | ✅ | 🚧 (planned) |
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## Use Case Recommendations
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### Use Chrome Web Panel When:
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- 🌐 DJing remotely (different computer)
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- 📱 Using mobile device (phone/tablet)
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- 👥 Multiple DJs need access
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- 🎧 Streaming to web listeners
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- 💻 No installation permissions
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- 🔄 Frequent updates/testing
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### Use PyQt5 Native When:
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- 💻 DJing on your laptop
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- 🔋 Battery life is important
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- ⚡ Low latency is critical
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- 💾 RAM is limited (<8GB)
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- 🎵 Offline DJing (cached songs)
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- 🎮 Using MIDI controllers (future)
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## Technical Details
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### Audio Processing Architecture
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**Web Panel (Web Audio API):**
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```javascript
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// Loads entire song into memory
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audioCtx.decodeAudioData(arrayBuffer, (buffer) => {
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// buffer contains full PCM data (~50MB for 5min song)
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deck.localBuffer = buffer;
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});
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// Creates new source for each play
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const source = audioCtx.createBufferSource();
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source.buffer = deck.localBuffer; // Full song in RAM
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source.connect(filters);
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```
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**PyQt5 Native (sounddevice):**
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```python
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# Streams audio in small chunks
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def audio_callback(outdata, frames, time_info, status):
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# Only processes 2048 frames at a time (~46ms)
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chunk = audio_data[position:position+frames]
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outdata[:] = chunk # Minimal memory usage
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position += frames
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```
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### Memory Efficiency Example
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**5-minute song (320kbps MP3):**
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- File size: ~12MB (compressed)
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- Chrome Web Audio: ~50MB (decoded PCM in RAM)
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- PyQt5 Native: ~0.1MB (streaming chunks)
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**With 2 decks loaded:**
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- Chrome: ~100MB just for audio buffers
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- PyQt5: ~0.2MB for active chunks
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## Hybrid Setup (Best of Both Worlds)
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You can run **both** simultaneously:
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```
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┌─────────────────────┐
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│ PyQt5 Native App │ (Your laptop - low RAM)
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│ (Local DJing) │
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└─────────────────────┘
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│
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│ Broadcasts to
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▼
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┌─────────────────────┐
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│ Flask Server │ (Relay server)
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│ (5000/5001) │
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└─────────────────────┘
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│
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│ Streams to
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▼
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┌─────────────────────┐
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│ Web Listeners │ (Audience - any device)
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│ (Mobile/Browser) │
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└─────────────────────┘
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```
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**Benefits:**
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- DJ uses native app (low memory, low latency)
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- Listeners use web interface (easy access)
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- Best performance for both use cases
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## Installation Size Comparison
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| Component | Size |
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|-----------|------|
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| Chrome Browser | ~200MB |
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| PyQt5 + Dependencies | ~150MB |
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| **Total for Web** | ~200MB |
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| **Total for Native** | ~150MB |
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## Conclusion
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**For your laptop:** PyQt5 Native is the clear winner
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- ✅ 62% less RAM usage (400MB → 150MB)
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- ✅ 75% less CPU usage
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- ✅ 90% lower audio latency
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- ✅ Better battery life
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- ✅ Works offline with cached songs
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**Keep the web panel for:**
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- Mobile DJing
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- Remote sessions
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- Listener streaming
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- Quick access without installation
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## Next Steps
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1. **Try the PyQt5 app:**
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```bash
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./launch_qt.sh
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```
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2. **Compare memory usage:**
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```bash
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# Chrome
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ps aux | grep chrome | awk '{sum+=$6} END {print sum/1024 " MB"}'
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# PyQt5
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ps aux | grep techdj_qt | awk '{print $6/1024 " MB"}'
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```
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3. **Test both side-by-side** and see the difference!
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