There are 4 modes listed in the getAvailableModes() API
>>> a = 
['pcm', 'mp_pcm', 'qmp', 'mp']
Only brief description in read.me of tof-viewer:
examples/tof-viewer/README.md:Currently, the Viewer offers 1 Mega Pixel (mp), PCM (mp_pcm), and Quarter Mega Pixel (qmp) options. Observe that Active Brightness (AB) and Depth views are in separate windows, and Point Cloud and Depth view is an alternative option.
Is there any detail description about the 4 modes?