What does "tunnelled video" mean for Andorid

To summarize, when Tunneled video playback is active,

• OMX Component has advertised the support for the same
• Complete feature is a vendor specific implementation and framework doesn't come into picture for resource allocation or synchronization
• A/V Sync is handled at the hardware level - Support is required in Audio HAL to retrieve the references for the same
• Video Decoder pushes the current frame directly to the display hardware
• The Display hardware "probably" composes this picture on top of current picture being displayed and directly outputs to the screen
• If the underlying HW is unable to support, a solid color is displayed

Ref:

https://groups.google.com/forum/#!topic/android-platform/isNabAHLLks