Created
March 13, 2011 02:42
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Nook DSP
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| DSP firmware currently on gerrit(3/15/11). Now merged(3/16/11) | |
| DSP is seemingly fully functional now with codec support. However, the frame rate is absymal. We need to figure out what is bottlenecking the fps. | |
| Why do I think the DSP is not the issue? | |
| When I force software codecs which are built into Stagefright and separate from OMX, the frame rate is the same as with DSP accel. At first glance this | |
| made me think the DSP codecs were not working and as such, I've stated all along that the DSP is nonfunctional. However, after further testing the | |
| software codecs I realized the slow frame rate was not a CPU bottleneck. If I limit the CPU to 300mhz the frame rate is the same as forcing 1.1ghz. This | |
| tells me the there is some other bottleneck or issue. I then tested with and without the hardware overlay, same result. So, what I am seeing is, | |
| regardless of the hardware overlay, software codec, hardware codec, or video bitrate(within reason) used, the framerate is constant. | |
| Incidentally, the Gingerbread n900 port has the exact same video playback issue as we do. | |
| See this youtube clip: http://www.youtube.com/watch?v=KiFQk08xqME | |
| The nook video playback with DSP accel looks exactly like that n900 clip. |
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