20230529-0

Major changes

• The buffer length option -b is ignored. The audio sample data sent to AudioOutput base classes are no longer pre-buffered.

Other implementation changes

• DataBuffer class is reimplemented as a wrapper of moodycamel::BlockReaderWriterQueue, which allows efficient blocking operation and removes the requirements of busy waiting by using moodycamel::BlockReaderWriterQueue::wait_dequeue().
• Explicitly skip IF Resampler in class FmDecoder to reduce CPU usage for typical settings (i.e., IF sample rate is set to 384 ksamples/sec for Airspy HF+).
• Removed unnecessary error detection code for MultipathFilter::process().
• Other miscellaneous fixes. See CHANGES.md for the details.

20230430-0

• Fix FM multipath filter coefficient of the reference point to unity (1 + 0j).

20221215-1

• Add code to prevent anomalies on IF and AF AGCs.
• Update r8brain-free-src to Version 6.2.

20220911-0

• Refactored status display.
• Miscellaneous source code and documentation fix.

20220903-0

• Thread handling of DataBuffer.h is refactored and streamlined. A possible audio output bug on macOS seems to be fixed.
• Miscellaneous source code and documentation fix.

20220818-1

• Replace IF and AF resampling library with r8brain-free-src. Libsoxr dependency eliminated. Git submodule initialization required for compilation of r8brain-free-src.
• Miscellaneous source code and documentation fix.

20220809-0

Revised IF and AF AGC algorithms. Miscellaneous source code comment and documentation fix.

20220313-1

Miscellaneous documentation fixed and refactoring. Removed buggy FM IF AFC code introduced in 20220313-0.

20220221-0

• Refactor signal handler
• Shorten waiting time for Airspy R2/Mini and Airspy HF+ for quitting
• Other improvements

20211209-0

First release for Apple Silicon (M1) macOS.