I've been working on BotWave, which turns a Raspberry Pi into an FM transmitter.
A user requested live streaming support so apps like Spotify (via raspotify) or
Snapcast could broadcast directly to FM instead of just playing files.
What I did creates an ALSA loopback device that appears as a virtual
sound card named "BotWave". Any audio application can output to it for immediate
FM transmission. For networked setups, I built PCM streaming using HTTP octet-stream.
Some details:
On install, the ALSA snd-aloop module is configured at system level, It uses pyalsaaudio for audio capture (48kHz stereo default), Async/sync generator bridging for the existing broadcast infrastructure, Tested with aplay/VLC/ffmpeg, works reliably
The feature is complete and testable on the livestream-test branch. I'm looking for
feedback before merging to main, especially from anyone who's used raspotify or
snapcast with ALSA devices. (I wasn't able to use raspotify since i don't have a premium Spotify account)
douxx|1 month ago
What I did creates an ALSA loopback device that appears as a virtual sound card named "BotWave". Any audio application can output to it for immediate FM transmission. For networked setups, I built PCM streaming using HTTP octet-stream.
Some details: On install, the ALSA snd-aloop module is configured at system level, It uses pyalsaaudio for audio capture (48kHz stereo default), Async/sync generator bridging for the existing broadcast infrastructure, Tested with aplay/VLC/ffmpeg, works reliably
The feature is complete and testable on the livestream-test branch. I'm looking for feedback before merging to main, especially from anyone who's used raspotify or snapcast with ALSA devices. (I wasn't able to use raspotify since i don't have a premium Spotify account)
Project: https://github.com/dpipstudio/botwave