If you just want to play around with it, you could write a thin Java wrapper app that does most of its work in a JNI library. The Java app creates a SurfaceView with a PUSH_BUFFER surface and passes the SurfaceHolder into a JNI function. You'll need to make your function a friend of the SurfaceHolder class to extract the ISurface (see MediaPlayer.cpp as an example).
As you surmised, when you are ready to render, you create an ashmem heap with room for at least two frame buffers and call registerBuffers to register the frame buffer heap with SurfaceFlinger. Read the YUV from the file and copy the first frame into your frame heap, then call pushBuffer() with the heap offset for the frame. Copy the next frame into the second frame buffer on the heap. At presentation time, call pushBuffer() with the offset of the second frame. Now go back and refill the first frame buffer with the next frame and repeat. For the G1, you will need to convert your frames to YUV 420 semi- planar which is Y plane followed by interleaved plane of VU (sub- sampled by 2 in both directions and V comes before U which is the reverse of the usual). If you are looking for a cross-platform solution, be aware that we are adding overlay capability and that will require a different mechanism for pushing your frames to the overlay memory. On Jan 17, 6:09 am, iblues <[email protected]> wrote: > Thanks Dave! > > On Jan 16, 6:35 pm, Dave Sparks <[email protected]> wrote: > > > We are not ready to support this use case yet. It works on the G1 now > > only because the codec and the display processor use the same YUV > > format. We can get away with that because it's buried in the media > > framework and doesn't rely on an application having special knowledge > > of the format. The software renderer does not do full color > > conversion. On the emulator, that means you will only see the Y plane. > > > We are hashing out a new API that will provide deeper access to the > > video rendering pipeline in a future release. > > > On Jan 16, 4:39 am, iblues <[email protected]> wrote: > > > > Hi, > > > > My requirement needs me to draw the YUV data from the framework layer. > > > Is this possible? From the android code, I seem to understand the > > > following : > > > > 1. Create an ISurface object. > > > 2. Extract frame data in form of YUV > > > 3. Create a IMemory object with the YUV data. > > > 4. Call mSurface->RegisterBuffer() > > > > My doubts are :: > > > 1. Is my understanding right? Is this approach feasible? > > > 2. How do we create IMemory object referencing to the frame data? Say, > > > I set the yuv file( in the SD card) as a data source to the framework > > > class. > > > > Thanks & Regards, > > > iblues --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "android-framework" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-framework?hl=en -~----------~----~----~----~------~----~------~--~---
