I try to follow the wifi display codes in Android Jelly bean 4.2. In wifi display, the PlaybackSession class will be responsible for getting the data. And finally it will get the data from a class called SurfaceMediaSource, which inherits from MediaSource. The data is in BufferQueue in SurfaceMediaSource. But I cannot find who is responsible for write the data to the BufferQueue. I believe the SurfaceFlinger should do it. However, I cannot find any specific codes. Does anyone know how it works?
Who provide the data for wifi display?
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Check
onDisplayConnected()call inwfd.cppandcom.android.server.display.DisplayDevice. Both will end up inSurfaceComposerClient::setDisplaySurface()inframeworks/native/libs/gui/SurfaceComposerClient.cpp.Sadly I don't understand how setting of
DisplayState::eSurfaceChangedwould cause the display to be rendered to theBufferQueueinSurfaceMediaSource.