TODO:
Audio player for the 555nm Vivid installation.
Much work is still to be done...
The proof of concept app provides cross-platform audio playback using rodio and basic IP control with OSC messages using rosc. I2C interface is planned but yet to be implemented. The i2cdev looks like a good foundation for SMBus communication to the lighting rig. The semantics of this interface are yet to be designed.
Not yet implemented
If you are running on a Linux based system, such as a Raspberry Pi, you will need ALSA as it is required for audio playback.
ALSA is not installed on many Debian based Linux distributions. Installation can be achieved through a package manager, such as aptitude. To do so you will need an active internet connection. If you haven't recently updated your package list, first run:
sudo apt update
When your package list is updated, install ALSA with:
sudo apt install libasound2-dev
Following this install you need to create a configuration for ALSA.
Create your config file /etc/asound.conf.
You can use any editor you like, such as vim, but nano will be used here for simplicity.
sudo nano /etc/asound.conf
This will open a new file for editing which will be created when saved. There are two entries which we must define, the default pcm and ctl entities.
pcm.!default {
type hw
card 0
}
ctl.!default {
type hw
card 0
}
This will define the default sound output as the analogue out. Restart the device with:
sudo reboot
After restarting the device you can test the audio setup with the following:
speaker-test --test wav --channels 2
If you are hearing a lot of noise from a Raspberry Pi's audio out, try adding:
audio_pwm_mode=2
To /boot/config.txt and restart the Pi.
Firstly install the rust toolchain on the device:
curl https://sh.rustup.rs -sSf | sh
Download the source code by cloning this git repo:
git clone <git repo url>
Then in the root directory use Rust's cargo utility to build our project and it's dependencies:
cargo build --release
The executable can then be found in target/release/555nm-soundscape
Multiple options are available for achieving 4 channels of audio output from a Raspberry Pi.
- Expansion hat (No options easily available currently)
- Custom GPIO arrangement (Unsearched)
- External USB sound cards with multiple output channels
- A Combination of built-in analogue output with stereo USB sound card with ALSA configuration
- Video/Audio splitter from HDMI (No obvious choices)
Update your ALSA configuration to group two devices into a single output. See: https://alsa.opensrc.org/TwoCardsAsOne