sunxi G2D issues
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Ivan Kozic
May 14, 2014, 6:01:05 AM5/14/14
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Hi all,
I ran a video through G2D in order to use the G2D palette mode to alter some colors. For start, I just ran a BITBLT which just does a CSC to same color space (both source and destination are set to G2D_FMT_IYUV422), so that I can see how video looks like after G2D rendering. The video coming from CSI is 720p60. I'm using sunxi 3.4.75 kernel where display and CSI drivers are a bit modded to suit my needs, but G2D driver is stock from kernel. All on Olinuxino A20. I'm facing two issues:
1. Vertical tearing - not so bad, but a horizontal line goes slowly over time from the top of screen to the bottom and then again. Don't really know why it comes - it is there even if I set the wrong output color format, so it comes from the G2D driver. Anyone knows why this is happening?
2. "Screen door effect" - hard to explain unless you own a newer ThinkPad :) But basically it looks like a fine vertical grid over the video. I think the cause of this is that video is not rendered properly - I don't know if the underlying cause is a bad driver or me not setting the BLT struct properly. But since there are not many settings and since I've tried most of them (makes no diffenernce), I'm thinking it comes from the driver. Also colors are a bit weird and video looks a bit smudged/blurred.
Don't know if that is important, but CSI format is V4L2_PIX_FMT_NV16, while display driver format is DISP_FORMAT_YUV422 with DISP_MOD_NON_MB_UV_COMBINED mode.
Anyone has some experience with this?
I ran a video through G2D in order to use the G2D palette mode to alter some colors. For start, I just ran a BITBLT which just does a CSC to same color space (both source and destination are set to G2D_FMT_IYUV422), so that I can see how video looks like after G2D rendering. The video coming from CSI is 720p60. I'm using sunxi 3.4.75 kernel where display and CSI drivers are a bit modded to suit my needs, but G2D driver is stock from kernel. All on Olinuxino A20. I'm facing two issues:
1. Vertical tearing - not so bad, but a horizontal line goes slowly over time from the top of screen to the bottom and then again. Don't really know why it comes - it is there even if I set the wrong output color format, so it comes from the G2D driver. Anyone knows why this is happening?
2. "Screen door effect" - hard to explain unless you own a newer ThinkPad :) But basically it looks like a fine vertical grid over the video. I think the cause of this is that video is not rendered properly - I don't know if the underlying cause is a bad driver or me not setting the BLT struct properly. But since there are not many settings and since I've tried most of them (makes no diffenernce), I'm thinking it comes from the driver. Also colors are a bit weird and video looks a bit smudged/blurred.
Don't know if that is important, but CSI format is V4L2_PIX_FMT_NV16, while display driver format is DISP_FORMAT_YUV422 with DISP_MOD_NON_MB_UV_COMBINED mode.
Anyone has some experience with this?
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