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# How To
This document describes the common commands for building and testing the project.
## Features
* **Real-time Audio Synthesis**: The demo features a multi-voice synthesizer that generates audio in real-time from spectrograms.
* **Dynamic Sound Updates**: Spectrograms can be updated dynamically and safely during runtime for evolving soundscapes.
## Building
### Debug Build
```bash
cmake -S . -B build
cmake --build build
```
### Size-Optimized Build
```bash
cmake -S . -B build -DDEMO_SIZE_OPT=ON
cmake --build build
```
## Testing
To build and run the tests, you need to enable the `DEMO_BUILD_TESTS` option in CMake.
Available test suites:
* `HammingWindowTest`: Verifies the properties of the Hamming window function.
* `SynthEngineTest`: Verifies the core functionality of the audio synthesizer.
* `SpectoolEndToEndTest`: Performs an end-to-end test of the `spectool` by generating a WAV file, analyzing it, and verifying the output.
```bash
cmake -S . -B build -DDEMO_BUILD_TESTS=ON
cmake --build build
cd build
ctest
cd ..
```
## Tools
### Spectrogram Tool (`spectool`)
A command-line tool for analyzing WAV and MP3 files into spectrograms and playing them back.
#### Building the Tool
To build `spectool`, you need to enable the `DEMO_BUILD_TOOLS` option in CMake.
```bash
cmake -S . -B build -DDEMO_BUILD_TOOLS=ON
cmake --build build
```
The executable will be located at `build/spectool`.
#### Usage
**Analyze an audio file:**
```bash
./build/spectool analyze path/to/input.wav path/to/output.spec
# or
./build/spectool analyze path/to/input.mp3 path/to/output.spec
```
**Play a spectrogram file:**
```bash
./build/spectool play path/to/input.spec
```
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