Revert "use Google/ffmpeg codecs"

This reverts commit 4926b2d498ec457a65e1c4876eac551e97f359c3.
Revert "use Google/ffmpeg codecs"

This reverts commit 5c2a6a523979e38196308c2846ecb9f742b2bf1d.
Revert "audio: pcm offload"

This reverts commit 7c399b9124db2b66111aed55115aa3cf28160333.