Here is a list of all documented files with brief descriptions:

examples
pa_devs.c	List available devices, including device information
pa_fuzz.c	Distort input like a fuzz box
paex_mono_asio_channel_select.c	Play a monophonic sine wave on a specific ASIO channel
paex_ocean_shore.c	Generate Pink Noise using Gardner method, and make "waves". Provides an example of how to post stuff to/from the audio callback using lock-free FIFOs implemented by the PA ringbuffer
paex_pink.c	Generate Pink Noise using Gardner method
paex_read_write_wire.c	Tests full duplex blocking I/O by passing input straight to output
paex_record.c	Record input into an array; Save array to a file; Playback recorded data
paex_record_file.c	Record input into a file, then playback recorded data from file (Windows only at the moment)
paex_saw.c	Play a simple (aliasing) sawtooth wave
paex_sine.c	Play a sine wave for several seconds
paex_sine_c++.cpp
paex_wmme_ac3.c	Use WMME-specific interface to send raw AC3 data to a S/PDIF output
paex_wmme_surround.c	Use WMME-specific channelMask to request 5.1 surround sound output
paex_write_sine.c	Play a sine wave for several seconds using the blocking API (Pa_WriteStream())
paex_write_sine_nonint.c	Play a non-interleaved sine wave using the blocking API (Pa_WriteStream())
include
pa_asio.h	ASIO-specific PortAudio API extension header file
pa_jack.h	JACK-specific PortAudio API extension header file
pa_linux_alsa.h	ALSA-specific PortAudio API extension header file
pa_mac_core.h	CoreAudio-specific PortAudio API extension header file
pa_win_ds.h	DirectSound-specific PortAudio API extension header file
pa_win_wasapi.h	WASAPI-specific PortAudio API extension header file
pa_win_waveformat.h	Windows specific PortAudio API extension and utilities header file
pa_win_wdmks.h	WDM Kernel Streaming-specific PortAudio API extension header file
pa_win_wmme.h	WMME-specific PortAudio API extension header file
portaudio.h	The portable PortAudio API