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

[detail level 12]

C_BelaHwConfig
C_InternalBelaContext
CADSR
CAudioCodec
CAudioCodecParams
CAudioFile
CAudioFileReader
CAudioFileWriter
CAudioSystemClass
CAuxTaskNonRT
CAuxTaskRT
CBelaChannelGain
CBelaChannelGainArray
CBelaContext	Structure holding audio and sensor settings and pointers to I/O data buffers
CBelaContextFifo
CBelaContextSplitter
CBelaCpuData
CBelaDebounce
CSettings
CBelaEncoder	Connect a quadrature rotary encoder, and handle it at audio rate from Bela
CPins
CSettings
CBelaInitSettings	Structure containing initialisation parameters for the real-time audio control system
CBelaSteppedPot	Connect a stepped potentiometer and handle it at audio rate from Bela
CBiquad
CBiquadCoeff
CSettings
CBiquadCoeffT
CbufferDescription
CCentroidDetection
CCalculateCentroids
CCommand
CConvolver
CConvolverChannel
CCsData
CDataBuffer
CDataFifo
CDebounce	Debounce a boolean reading
CSettings
CDelayLine
CDigitalChannelManager
CDigitalToMessage
CEeprom
CSettings
CEncoder	Connect a quadrature rotary encoder
CEnvelopeDetector
CEs9080_Codec
CFft
CGlottisClass
CGpio
CGpioDebounce
CGui
CGuiController
CguiControlMessageHeader
CGuiSlider
CI2c
CI2c_Codec
CI2C_MPR121
CI2c_MultiI2sCodec
CI2c_MultiTdmCodec
CI2c_MultiTLVCodec
CTdmConfig
CIirFilter
CIirFilterStage
CJSON
CJSONValue
CMcaspConfig
CParameters
CMcaspRegisters
CMidi
CMidiChannelMessage
CMidiParser
CMmap
CMovingAverage
COnePole
COscillator
COscillatorBank
COscReceiver	OscReceiver provides functions for receiving OSC messages in Bela
COscSender	OscSender provides functions for sending OSC messages from Bela
CPipe
CPRU
CPruManager
CPulseIn	A class to measure the duration of a pulse on a digital pin
CQuadBiquad
CSampleData
CSampleStream
CScope	An oscilloscope which allows data to be visualised in a browser in real time
CSerial
CShiftRegister	A class to drive a shift register using Bela's digital I/O
CPins
CShiftRegisterIn
CShiftRegisterOut
CSimplexNoise	A Perlin Simplex Noise C++ Implementation (1D, 2D, 3D, 4D)
CSpi
CSettings
CSpi_Codec
CSteppedPot	Connect a stepped potentiometer
CTlv320_Es9080_Codec
CTouch
CTractClass
CTractUIClass
CTrill	A class to use the Trill family of capacitive sensors. http://bela.io/trill
CTrillDefaults
CtrillRescaleFactors_t
CTrillStatusByte
CUdpClient
CUdpServer
CUIClass
CWriteFile
CWSServer
CWSServerDataHandler