Re: [Cdrdao-devel] mixing plextor and generic-mmc driver

[Andreas M. <an...@da...>]

thomas graichen wrote:
> 
> ok - i got a bit further on this (for "this" see the appended
> old posting about the old problem all this started with): it
> works fine with plextor:0x00200000 for reading the toc (but
> results in errors then starting to read the data) and it gives me
> an "can't read ISRC" error then using generic-mmc:0x00200020
> while reading the toc but i this mode it can read the data fine
> 
> i tried all the other options - none helped me further - so the
> problem now would be for me to hack together a driver which uses
> the plextor driver for reading the toc and the generic-mmc for
> the audio data but after reading the code for some time i'm not
> really shure which function to change ... my idea was to make it
> similar to the ToshibaReader.cc - take the Plextor settings and
> overwrite the functions for reading the data or the other way
> around using the GenericMMC and overwriting the read-toc realted
> stuff or as third (and i think best) option: add an option to the
> generic-mmc driver to use plextor scanning

I think we can easily fix the ISRC related error message in the
generic-mmc driver by adding a short delay before it tries to read
the ISRC code. This might be required for some drives because the
binary search mechanism (seleted with driver option 0x20) use a
Play Audio command to play a single audio sector so that it can read
out the sub-channel data for that sector. When issuing the Play Audio
command the drive return success status before the command is finished
so that it might happen that a new command is issued before the old
command has finished. This might also be the reason for the other
error messages you get. Can you send them btw?

So, I would suggest to fix the binary search mode in generic-mmc driver.
The first shot would be to place a 'mSleep' call right after the play
command. It should sleep roughly the same time as it takes to
play an audio sector (1/75 s). My problem is that I'm currently lacking
free time so could you try to make the modifications and test them?

Regards,
Andreas
--
Andreas Mueller                  Tel: +49 89 67808848
Ramsmeierstr. 1                Email: an...@da...
85579 Neubiberg, Germany