viewport_live Update for A650IS Port

na560

11

« on: 19 / July / 2014, 15:23:14 »

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After rebuilding a used A650IS I noticed slow motion detection and then found that vid_get _viewport_live_fb was not implemented. Dug through RAM dumps and eventually found the right addresses. A working vid_get_viewport_live_fb follows for the A650 sub 100d.

Code: [Select]

void *vid_get_viewport_live_fb()
{
//    return (void*)0;
    void **fb=(void **)0x21D8;
    unsigned char buff = *((unsigned char*)0x208C);
    if (buff == 0) {
        buff = 2;
    }
    else {
        buff--;
    }
   return fb[buff];
}

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reyalp

14118

Re: viewport_live Update for A650IS Port

« Reply #1 on: 19 / July / 2014, 15:25:03 »

Thanks for that. Have you tested to verify that MD performance is improved? See http://chdk.wikia.com/wiki/Testing#MD_tune.bas

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na560

11

Re: viewport_live Update for A650IS Port

« Reply #2 on: 20 / July / 2014, 07:21:15 »

While rebuilding the A650 I clumsily tore the AF LED ribbon so can't use MD_Tune. However, I did test it with DataGhost's motion detector speed test. So relatively speaking with the test running on my laptop driving a separate display, 1.3.0-3496 gave detect times ranging from 130 to 320ms with a median of 210ms. With the new vid_get_viewport_live_fb, detect times varied only from 110 to 150ms with a130ms median.
Glad you asked.

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reyalp

14118

Re: viewport_live Update for A650IS Port

« Reply #3 on: 20 / July / 2014, 14:53:38 »

Quote from: na560 on 20 / July / 2014, 07:21:15

While rebuilding the A650 I clumsily tore the AF LED ribbon so can't use MD_Tune. However, I did test it with DataGhost's motion detector speed test. So relatively speaking with the test running on my laptop driving a separate display, 1.3.0-3496 gave detect times ranging from 130 to 320ms with a median of 210ms. With the new vid_get_viewport_live_fb, detect times varied only from 110 to 150ms with a130ms median.
Glad you asked.

Thanks. I've checked this in on both the 1.2 and 1.3 branches.

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Don't forget what the H stands for.