I've found https://www.volkerschatz.com/noise/alsa.html https://www.volkerschatz.com/noise/alsa.html to be a good overview of ALSA's architecture (though many o

I've found https://www.volkerschatz.com/noise/alsa.html https://www.volkerschatz.com/noise/alsa.html to be a good overview of ALSA's architecture (though many of the things mentioned, like ogg123, are no longer in common use).