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+# Testing tools
+
+The provide Makefile and CMakeLists.txt create various tools used to test BTstack.
+The test tools run on Linux and Mac systems with a USB Bluetooth Controller.
+
+The Audio tests (`avdtp_source_test.c` and `avdtp_sink_test`) support the folowing audio codecs: SBC, AAC, aptX, and LDAC.
+Support for non-mandatory codecs is only included in the CMake build. 
+These audio codecs are provided by the open-source projects below, but cannot be used for products without licensing/testing by the respective owners.
+
+## Dependencies
+
+- [libusb](https://libusb.info)
+- AAC: A2DP Sind + Source
+  - [Debian package: libfdk-aac-dev](libfdk-aac-dev)
+  - [Mac Homebrew: fdk-aac]
+- aptX: A2DP Sind + Source
+  - [Github: libopenaptx](https://github.com/mringwal/libopenaptx)
+  - CMake project
+- LDAC Encoder: A2DP Source
+  - [Github: ldacBT](https://github.com/EHfive/ldacBT)
+  - CMake project
+- LDAC Decoder: A2DP Sink
+  - [Github: ldacdec](https://github.com/mringwal/libldacdec)
+  - Automake project
+ 
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