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2018-05-28Split rtlsdr code into standalone helperScott Murray1-54/+216
To avoid the GPL licensed code in rtl_fm.c making all of the binding GPL, rework things to wrap it with a simple standalone helper executable that is driven via stdin/stdout. While this could potentially be done by running the original unmodified rtl_fm utility itself, it would be impossible to implement scanning with that approach without some compromising of playback latency and quality. The current helper implementation is simple enough that replacing it with an alternate one should be relatively straightforward if that is desired. Change-Id: If83b834da3999f5807d1453524ae72b1c3559c90 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 Murray1-27/+48
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/+254
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>