Here are the classes, structs, unions and interfaces with brief descriptions:

CA2DPDefaultVolumeControl	Default implementation for handling of the volume of the audio data
CA2DPLinearVolumeControl	The simplest possible implementation of a VolumeControl
CA2DPNoVolumeControl	Keeps the audio data as is -> no volume control!
CA2DPSimpleExponentialVolumeControl	Exponentional volume control
CA2DPVolumeControl	Abstract class for handling of the volume of the audio data
Capp_msg_t	Internal message to be sent for BluetoothA2DPSink and BluetoothA2DPSource
CBluetoothA2DPCommon	Common Bluetooth A2DP functions
CBluetoothA2DPSink	A2DP Bluethooth Sink - We initialize and start the Bluetooth A2DP Sink. The example https://github.com/espressif/esp-idf/tree/master/examples/bluetooth/bluedroid/classic_bt/a2dp_sink was refactered into a C++ class
CBluetoothA2DPSinkQueued	The BluetoothA2DPSinkQueued is using a separate Task with an additinal Queue to write the I2S data. application
CBluetoothA2DPSource	A2DP Bluetooth Source
COneChannel8BitSoundData	1 Channel data is provided as signed int8 values
COneChannelSoundData	1 Channel data is provided as int16 values
CSoundData	Sound data as byte stream. We support TwoChannelSoundData (uint16_t + uint16_t) and OneChannelSoundData which stores the data as array of uint16_t We provide the complete sound data as a simple c array which can be prepared e.g. in the following way
CTwoChannelSoundData	Data is provided in two channels of int16 data: so len is in 4 byte entries (int16 + int16)