stagefright: don't auto-drop temporal layers for unknown SVC streams
- SVC optimization requires knowin the number of layers which is
using custom signaling. Don't drop temporal layers without that information.
Also SVC optimization fixes:
- Play back all layers immediately after an IDR frame (previous logic
required leveling up one level at a time that only works for hierarchical
B frames)
- Track current max layer-ID during dropping so we can react to upward
changes in the allowed layers more quickly.
- Get up to 90% of display rate before dropping layers (up from 50%)
Bug: 27596987
Change-Id: Ia6c8363fc154c822a5b2a268e2f40678212a487c
1 file changed
