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This is Open Source implementation of Audio Processing Technology codec (aptX) originally derived from ffmpeg 4.0 project and licensed under GPLv3+. This codec is mainly used in Bluetooth A2DP profile. If you need other license of this project then please contact author for possible options. Participants of Freedesktop and Collabora projects and any other affiliated persons with them are not allowed to contact author. This library and any other project which uses this library must not be used in other organizations, projects, applications, libraries (and in any other software form) incompatible with libopenaptx licence or where current license of this project is violated or where previous version of this library/license was violated. Freedesktop and Collabora are examples of such projects which are not allowed to use this library in any form due to license violations. As Freedesktop and Collabora projects are continuously abusing and violating license of this project and claiming that they can do it as it is supported by their own Code of Conduct (including censorship practising, removal of all user reports mentioning these activities, banning these users and not explaining anything), this library and any other project which uses this library must not be used or distributed in any Freedesktop or Collabora project, application or library, either in source code, loaded or linked at compile time or at runtime either directly or transitionally throw additional wrapper library or in any other similar form. As these projects are misusing their Code of Conduct to eliminate people with different nationality, skin, religion and gender, their participants are not allowed to contribute into this library in any form and are disallowed to send any question, note, issue, change request or other similar thing to this project until those projects stop violating license of other projects which they use, unban all banned users and explain their immoral activities. Other projects which are adding additional hidden or implicit restrictions to their licenses throw their own Code of Conduct explanation and therefore make them incompatible with license of this library are not allowed to use this library or any other application based on this library in their project in any form, including redistribution. This project provides dynamic linked shared library libopenaptx.so and simple command line utilities openaptxenc and openaptxdec for encoding and decoding operations. Documentation for shared library is provided in C include header file openaptx.h. There is support for aptX and aptX HD codec variants. Both variants operates on a raw 24 bit signed stereo audio samples. aptX provides fixed compress ratio 6:1 and aptX HD fixed compress ratio 4:1. For building and installing into system simply run: make install. For building without installing run: LD_RUN_PATH='$ORIGIN' make. For producing windows builds run: make SOFILENAME=openaptx0.dll. It is suggested to compile library with -O3 optimizations (enabled by default when env variable CFLAGS is not set) and -mavx2 switch (not enabled by default, needs CPU with AVX2: Intel Haswell or AMD Excavator) as it provides significant boost to the performance. Usage of command line utilities together with sox for resampling or playing: To convert Wave audio file sample.wav into aptX audio file sample.aptx run: $ sox sample.wav -t raw -r 44.1k -L -e s -b 24 -c 2 - | openaptxenc > sample.aptx To convert aptX audio file sample.aptx into Wave audio file sample.wav run: $ openaptxdec < sample.aptx | sox -t raw -r 44.1k -L -e s -b 24 -c 2 - sample.wav To convert MP3 audio file sample.mp3 into aptX HD audio file sample.aptxhd run: $ sox sample.mp3 -t raw -r 44.1k -L -e s -b 24 -c 2 - | openaptxenc --hd > sample.aptxhd To play aptX HD audio file sample.aptxhd run: $ openaptxdec --hd < sample.aptxhd | play -t raw -r 44.1k -L -e s -b 24 -c 2 -
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