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pali authored
This patch provides support for aptX and aptX HD codecs in bluetooth A2DP profile. It uses open source LGPLv2.1+ licensed libopenaptx library which can be found at https://github.com/pali/libopenaptx. aptX for s24 stereo samples provides fixed 6:1 compression ratio and bitrate 352.8 kbit/s, aptX HD provides fixed 4:1 compression ratio and bitrate 529.2 kbit/s. According to soundexpert research, aptX codec used in bluetooth A2DP is no better than SBC High Quality settings. And you cannot hear difference between aptX and SBC High Quality, aptX is just a copper-less overpriced audio cable. aptX HD is high-bitrate version of aptX. It has clearly noticeable increase in sound quality (not dramatic though taking into account the increase in bitrate). http://soundexpert.org/news/-/blogs/audio-quality-of-bluetooth-aptx
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