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How to use Mali to convert YUV to RGB32

james zhang over 11 years ago

Note: This was originally posted on 17th November 2012 at http://forums.arm.com

[font=文泉驿正黑][size=2][font=arial, verdana, tahoma, sans-serif][size=2]Hi all,

[/size][/font]
    In FirefoxOS, there is a Cubevid application. It use vp8 software codec and the performance is not well.

    We use DS5 to find the hot spot, YUV convert to RGB32. You can see [size=2]FastConvertYUVToRGB32Row_C@[/size][size=2]yuv_row_c[/size][size=2].cpp[/size][size=2] in attachment[/size] .

    Can you help me to use GPU(Mali300) to convert YUV to RGB?

    Thanks for your help!

    You can get FFOS code as below.

    git clone git://github.com/mozilla/releases-mozilla-central

BR
James[/size][/font]

james zhang over 11 years ago
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Chris Varnsverry over 11 years ago

Note: This was originally posted on 19th November 2012 at http://forums.arm.com

Hi Jameszhang,

Can I ask what hardware you're currently targeting? Also is there any reason you're not using NEON for this purpose, as it seems a good fit for this use case? For example I believe the webm project have an existing neon implementation of the VP8 codec (http://code.google.com/p/webm/source/browse/vp8/?repo=libvpx&name=sandbox/jkoleszar/new-rate-control#vp8%2Fdecoder%2Farm%2Fneon).

Thanks,
Chris
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james zhang over 11 years ago
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Chris Varnsverry over 11 years ago

Note: This was originally posted on 20th November 2012 at http://forums.arm.com

Hi James,

This post has some sample shader code for this purpose. You would need to push the YUV data as a texture to the GPU.

Let me know if this helps or if you need any more guidance.

Thanks,
Chris
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james zhang over 11 years ago

Note: This was originally posted on 21st November 2012 at http://forums.arm.com

Hi Chris,

I found a chrome patch which optimizes YUV2RGB performance by NEON assembly, http://code.google.com/p/chromium/issues/detail?id=71403. The major hotspot "FastConvertYUVToRGB32Row_C" reduced quite a lot from 23% to 3%. But we still have some audio clipping during the video play.

So I will try the shader code.

Thanks
James
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