Added MSISAC compatibility
Merge branch 'isac'
fix bad audio problem on windows at 48khz.
fix mistake in alsa.c
enable webrtc aecm for android x86
Added iSAC codec to the test suite. Needs the codec to be installed in plugins for them to work
fix crash
Drop some very old ffmpeg API.

Make compilation succeed on Jessie.
Revert "Drop some very old ffmpeg API."

This reverts commit 5c33fb5f9d9a9ccfe8f620ba0f9ead009d9bb402.
Use newest ffmpeg functions.
fix compilation and behavior with old ffmpeg
ffmpeg integration fixes
dont allow msaudiounit to change sampling frequency at startup
Fix compilation for android
Don't fail iSAC test if the plugin is not found.
Use appropriate bandwidth for iSAC test