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2018-05-28Rework output to directly support 4AScott Murray1-1/+1
When building for 4A, switch to new gstreamer-based ALSA output for the RTL-SDR backend, and the Kingfisher backend now uses a gstreamer pipeline for its loopback to either an ALSA or Pulse sink depending on 4A or not. Using gstreamer instead of direct ALSA output has the benefit of transparently handling resampling to the M3ULCB hardware's required 48 KHz sample rate for the RTL-SDR backend. Change-Id: I2bfbf924927bb461cce88b04aba0e626f8d71215 Signed-off-by: Scott Murray <scottm@ghidorah.spiteful.org>
2017-12-21Add Kingfisher Si4689 supporteel_5.0.2eel_5.0.1eel_5.0.0eel/5.0.2eel/5.0.1eel/5.0.05.0.25.0.15.0.0Scott Murray1-16/+21
Add conditionally compilable support for the Si4689 radio on the M3ULCB Kingfisher infotainment board. The codebase has been refactored to allow multiple radio implementations, and when Kingfisher support is enabled, the binding will first look for a USB RTL-SDR adapter, then fallback to the Kingfisher Si4689 if one is not found. This allows easily switching to a RTL-SDR adapter if this initial Kingfisher support encounters issues. The back end implementation relies on a patched version of the "si_ctl" utility from Cogent Embedded's Kingfisher BSP changes. The modifications to it add FM band plan selection and scanning threshold tweaking for poor radio environments. Audio output is achieved by looping the radio's PulseAudio source to the appropriate sink depending on 4A or non-4A operation. For 4A compatibility, the PulseAudio source is created if it does not exist, which currently is the case due to PulseAudio's udev module being disabled when 4A is enabled. Additionally, the FM band plan for Japan has been corrected to go to 95 MHz, and a README.md file has been added documenting the optional configuration that can be done via /etc/xdg/AGL.conf for band plan selection and scanning sensitivity. Change-Id: I204906fed741d917fc3b8be962deadb4e59989db Signed-off-by: Scott Murray <scott.murray@konsulko.com>
2017-08-17binding: radio: update build system for standalone bindingMatt Ranostay1-0/+76
Radio binding is now standalone so the qmake build scripts need to be updated to reflect that Bug-AGL: SPEC-832 Change-Id: Iab9cd5d18536e416d22d91c492ef489159a62d0d Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com>