echo cancellation: ui, calibration, visualization
Merge branch 'master' of git://github.com/worklist/hifi into 19371
Working on reintegrating OpenCV (also, removed lodepng).
Missed these guys.
More required libraries for OS X.
Find Zlib the right way.
Missed QuartzCore.
Basic frame grab from camera; not currently working yet, but let's try on
OS X!
Must init webcam after OpenGL.
Read the webcam frames in a separate thread, since the call blocks.
Allow four channel images, create a copy.
Added adjustable audio jitter buffer (in preferences), and simple lowPassFilter (for pert testing compared to LPF)
Rather than copying to a QImage, just send the pointer.  Also, put the render
code in Webcam itself.
working on audio system, added metrics on in/out latency.
If we don't get the image frame, try again later.
libspeexdsp-based echo cancellation (untested)
Let's try using widthStep rather than nChannels and computing the alpha
values.
Let's try using glPixelStore to specify the widthStep.
Set the desired webcam resolution and fps, report what we actually get.
Show the acquisition fps.