A stand-alone application and framework for audio effects. This was created in conjunction with a dedicated Bluetooth A2DP Receiver.
The code can be embedded into an esp-idf project as a submodule/component or used by itself when compiled as a library.
Compiling the project via make all generates the ./bin/main library (or dll on windows).
NOTE: You must create ./obj and ./bin directories prior to running make.
Enabeling the python test script requires python 3. Generate a virtual enviornment:
python -m venv ./venvsource ./venv/bin/activate(or equivealent depedning on shell)
Install dependencies:
pip install -r requirements.txt
Compile and run python script:
make all; python main.py
This will call main.c:process() with all samples in a stereo audio file.
The test files, by default, should be .wav, 16 bit stereo. Located at ./data and named test{number}.wav. (This can be changed in the python script.)
This will generate and save a new, modified, version of the file with a -f suffix.
Every sample is processed by a fixed pipeline located in pipeline.c.
Input and Outputs are to be 16-bit words.
The processing is done in 32-Bit IEE754 floating point.
Currently available processes include:
- biquad
- dynamic range compressor
- dynamic range gate
- delay
- gain
- virtual / psycoacustic bass enhancement
- more docs
- noise shaping