[PATCH] spin up drive at open

[Christophe Massiot]

At 12:57 +0200 10/05/06, Diego Biurrun wrote:

>  > My DVD-ROM drive exhibits the peculiar behavior of refusing to properly
>>  authenticate if the drive is not "spun up."  Previously I had worked around
>>  this by starting my media player "dd if=/dev/dvd of=/dev/null; mplayer
>>  dvd://" and just hitting Ctrl+C once the drive made enough noise :-)
>>
>>  However, I've found that the attached patch fixes this issue for me, and
>>  allows the drive to authenticate and movie-viewing to proceed smoothly,
>>  whether the drive was spinning to begin with or not.  I am not, however,
>>  sure that this is the correct way to fix things.  Does this even belong in
>>  libdvdcss, or in some other software component entirely?  Please advise.
>
>I suggest you to propose this on the libdvcss-devel mailing list.  Given
>that this appears to be Linux-specific I wouldn't have high hopes of the
>patch getting accepted.  But possibly a different solution can be found.

libdvdcss is the place to put system-specific stuff, so things like 
that definitely belong here. However I'm wondering if the patch is 
correct, because from what I understand of kernel documentation, 
CDROMSTART 1. only applies to drives capable of reading CD audio 2. 
instructs the drive to play the first audio track, which is 
definitely not what we want. So I'm wondering 1. whether it wouldn't 
yield problems with some other type of DVD drive than yours, and 2. 
whether the positive effect you're seeing isn't just a side-effect of 
the fact that CDROMSTART waits for the drive to spin up before 
returning. In that case the correct fix might just be to raise the 
timeout duration on the read() call to the DVD drive before it 
reports an error.

-- 
Christophe Massiot.

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