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<!-- received="Mon Jul 14 09:13:50 1997 MST" -->
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<!-- sent="Mon, 14 Jul 1997 11:24:53 -0400 (EDT)" -->
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<!-- name="Andrew Kuchling" -->
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<!-- email="amk@magnet.com" -->
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<!-- subject="Re: Hangs with B&W QuickCam" -->
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<!-- id="199707141524.LAA16152@lemur.magnet.com" -->
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<!-- inreplyto="Hangs with B&W QuickCam" -->
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<title>sane-devel: Re: Hangs with B&W QuickCam</title>
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<h1>Re: Hangs with B&W QuickCam</h1>
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<b>Andrew Kuchling</b> (<a href="mailto:amk@magnet.com"><i>amk@magnet.com</i></a>)<br>
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<i>Mon, 14 Jul 1997 11:24:53 -0400 (EDT)</i>
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<p>
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<ul>
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<li> <b>Messages sorted by:</b> <a href="date.html#57">[ date ]</a><a href="index.html#57">[ thread ]</a><a href="subject.html#57">[ subject ]</a><a href="author.html#57">[ author ]</a>
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<li> <b>Next message:</b> <a href="0058.html">David Mosberger-Tang: "Re: Cheap linux photo scanner"</a>
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<li> <b>Previous message:</b> <a href="0056.html">David Mosberger-Tang: "Re: Hangs with B&W QuickCam"</a>
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<li> <b>Maybe in reply to:</b> <a href="0033.html">Andrew Kuchling: "Hangs with B&W QuickCam"</a>
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<li> <b>Next in thread:</b> <a href="0059.html">David Mosberger-Tang: "Re: Hangs with B&W QuickCam"</a>
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<li> <b>Reply:</b> <a href="0059.html">David Mosberger-Tang: "Re: Hangs with B&W QuickCam"</a>
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</ul>
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<!-- body="start" -->
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On Sun, 13 Jul 1997, Guido Muesch wrote:<br>
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<i>> No, you are right. I experience the same problem with xcam and BW</i><br>
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<i>> QuickCam. After the first scan it hangs. But using scanimage works so</i><br>
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<i>> far. I have not looked into this problem because I thought it is a</i><br>
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<i>> minor 'feature' which will get fixed soon, now that the BW support</i><br>
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<i>> actually does return at least one scan.</i><br>
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<p>
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scanimage should always work, because it only reads one image,<br>
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and therefore opens the device, reads from it, closes it and exits.<br>
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It's only things which try to read from the camera more than once<br>
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which hang. <br>
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<p>
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Thomas Mirlacher wrote:<br>
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<i>>Well, IMHO the problem is caused by different End Of Frame sequences,</i><br>
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<i>>used by the color and BW quickcam. so the usual workaround (for not so </i><br>
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<i>>clean coded drivers ;) should be to reset the cam after each scan.</i><br>
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<p>
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Adding qc_reset(q) after the qc_lock() in sane_start<br>
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(resetting things *before* the scan) seems to fix things, but I have<br>
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no idea what else that might break on colour qcams, so I wouldn't<br>
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consider that a fix just yet. Perhaps if qc_reset() was only called<br>
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if q->version!=QC_COLOR?<br>
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<p>
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Another minor problem: run xscanimage using the qcam, and set<br>
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it to high resolution. The dialog box isn't redrawn properly, with<br>
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some doubled text; an xwd dump of the result is at<br>
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<a href="http://starship.skyport.net/crew/amk/ocr/bug.xwd">http://starship.skyport.net/crew/amk/ocr/bug.xwd</a> . The resulting scan<br>
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doesn't work; does high resolution mode exist on the B&W qcam?<br>
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<p>
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<p>
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Andrew Kuchling<br>
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<a href="mailto:amk@magnet.com">amk@magnet.com</a><br>
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<a href="http://people.magnet.com/%7Eamk/">http://people.magnet.com/%7Eamk/</a><br>
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<p>
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<pre>
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--
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Source code, list archive, and docs: <a href="http://www.azstarnet.com/~axplinux/sane/">http://www.azstarnet.com/~axplinux/sane/</a>
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</pre>
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<!-- body="end" -->
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<p>
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<ul>
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<!-- next="start" -->
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<li> <b>Next message:</b> <a href="0058.html">David Mosberger-Tang: "Re: Cheap linux photo scanner"</a>
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<li> <b>Previous message:</b> <a href="0056.html">David Mosberger-Tang: "Re: Hangs with B&W QuickCam"</a>
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<li> <b>Maybe in reply to:</b> <a href="0033.html">Andrew Kuchling: "Hangs with B&W QuickCam"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0059.html">David Mosberger-Tang: "Re: Hangs with B&W QuickCam"</a>
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<li> <b>Reply:</b> <a href="0059.html">David Mosberger-Tang: "Re: Hangs with B&W QuickCam"</a>
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<!-- reply="end" -->
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</ul>
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