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Correction to buffer update for non-viewable frames.

The code previously tested cpi->common.refresh_alt_ref_frame
but there are situations where this flag may be set for viewable frames.

The correct test should be !cm->show_frame.

Change-Id: Ia1a600622992a4a68fe1d38ac23bf6b34b133688

--- a/vp8/encoder/onyx_if.c

+++ b/vp8/encoder/onyx_if.c

@@ -4614,7 +4614,8 @@

     }

     // Update the buffer level variable.

-    if (cpi->common.refresh_alt_ref_frame)

+    // Non-viewable frames are a special case and are treated as pure overhead.

+    if ( !cm->show_frame )

         cpi->bits_off_target -= cpi->projected_frame_size;

     else

         cpi->bits_off_target += cpi->av_per_frame_bandwidth - cpi->projected_frame_size;