Ivan Maltz 1ed0e1beb5 Move SVC per-frame loop from sample app into libvpx proper ...

SVC multiple layer per frame encoding is invoked with vpx_svc_init and
vpx_svc_encode. These interfaces are designed to be invoked from ffmpeg.
Additional improvements:
- make dummy frame handling a bit more explicit
- fixed bug with single layer encodes
- track individual frame sizes and psnrs instead of averages
- parameterized quantizer, 16th scalefactors, more logging,
- enabled single layer encodes to generate baseline
- include new mode for 3 layer I frame with 5 total layers

Change-Id: I46cfa600d102e208c6af8acd6132e0cc25cda8d4

2013-11-06 14:49:27 -08:00

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