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feat(audio): add idle timeout to auto-release ALSA device - #13
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- Added `idle_timeout_s` parameter (via `-t SECS` CLI flag and config file). Disabled by default (`0`) to ensure backward compatibility and avoid pop noise on some DACs. - Track stream stop events and device status in `ArmPlayerListener`. - Evaluate timeout in main loop to cleanly issue `audio_sink.stop()`. - Added startup log block displaying active configuration parameters.
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Description
Coming over from Snapcast, I started using sendspin-armv6 on my Raspberry Pi Zero W. While testing, I quickly ran into an issue regarding audio device management: By default, the
AlsaPipeSinkkeeps the underlying ALSA device permanently locked, even while the Sendspin server is not actively streaming audio (cat /proc/asound/.../statusshowsRUNNING).In embedded environments, this blocks other services (e.g., TTS engines, notification handlers, or other audio players) from sharing the sound card without setting up complex
dmixconfigurations. Additionally, having a reliable way to detect active playback vs. idle state is extremely helpful to control other hardware or trigger a relay.This PR introduces an optional idle timeout that seamlessly closes the ALSA device after a period of stream inactivity.
Changes
idle_timeout_sto theConfigstruct and config file parsing (and a matching-t SECSCLI argument).ArmPlayerListenernow tracks when the stream stops and marks the device state.audio_sink.stop()to cleanly close the ALSA handle.0(disabled) to maintain strict backward compatibility, preventing audible pop-artifacts on sensitive DACs.