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3 commits

Author SHA1 Message Date
Nicolas Dufresne
ba4053a2b9 alphadecodebin: Add wrappers to decode VP8/VP9 alpha 
This includes base class with wrappers bin that will create a static
pipeline capable of handling the VP8/VP9 alpha channel decoding
using two instances of vp8/vp9dec element each.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2199>
 2021-05-11 16:06:56 -04:00
Nicolas Dufresne
2cd927435c codecalpha: Implement alphacombine element 
This element will merge video buffers in order to use the alpha stream
luma plane as the alpha of the video stream. The implementation is zero-copy
and currently only support merging I420 stream with an I420, NV12 or GRAY8
alpha stream.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2199>
 2021-05-11 16:06:56 -04:00
Nicolas Dufresne
f3114d4d7e Introduce CODEC Alpha plugin 
This plugin contains a set of utility elements allowing to extract,
decode and combine CODEC (typically VP8/VP9) alpha stream.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2199>
 2021-05-11 16:06:56 -04:00