mmal: Register opaque fourcc in core as fake_fmt

Add a new fourcc, which will be used by the mmal decoder and vout plugins for
passing around opaque picture pointers to realize a zerocopy pipeline on mmal
enabled platforms.

Signed-off-by: Julian Scheel <julian@jusst.de>
Signed-off-by: Dennis Hamester <dennis.hamester@gmail.com>
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
video_output/mmal: Add mmal based video output plugin

This plugin uses the Multimedia Abstraction Layer (mmal) by Broadcom. It is
supported on recent Broadcom SoCs as found on the well known Raspberry Pi.
The plugin features support for native blending of overlays through DispManX.
Furthermore it supports automatic adaption of refresh rate to the video being
played through the tvservice API.

Signed-off-by: Dennis Hamester <dennis.hamester@gmail.com>
Signed-off-by: Julian Scheel <julian@jusst.de>
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
codec/mmal: Add mmal based decoder plugin

This plugin is capable of decoding MPEG-2 and H264 video through the Multi
Media Abstraction Layer (MMAL) by Broadcom. It is supported by recent Broadcom
SoCs and found on the widely spread Raspberry Pi.

Signed-off-by: Dennis Hamester <dennis.hamester@gmail.com>
Signed-off-by: Julian Scheel <julian@jusst.de>
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>