Re: [PATCH]snd-usb-usx2y 0.8.7: Use macro usb_maxpacket() for portability

[Takashi Iwai <tiwai@suse.de>]

At Tue, 7 Dec 2004 23:01:51 +0100,
Karsten Wiese wrote:
> 
> >>>>
> Summary: hwdep interface for pcm data.
> 
> Implements "rawusb" pcm data transfer through hwdep interface:
> The usb_hc moves pcm data from/into memory via DMA.
> That memory is mmaped by jack's usx2y driver.
> Jack's usx2y driver is the first/last executable code to read/write pcm data.
> Read/write is a combination of power of 2 period shaping and float/int conversation.
> Compared to standard alsa/jack we leave out power of 2 period shaping
> inside snd-usb-usx2y which needs memcpy() and additional buffers.
> As a side effect possible unwanted pcm-data coruption resulting of
> standard alsa's snd-usb-usx2y period shaping scheme falls away.
> Result is sane jack operation at buffering schemes down to 128frames, 2 periods.
> Also changed Kconfig file, so snd-usb-usx2y is only available for X86, PPC or ALPHA platforms,
> as on others DMA-memory isn't mmapable.
> 
> Signed-off-by: Karsten Wiese <annabellesgarden@yahoo.de>
> <<<<

Thanks, applied to the CVS tree now.
Please check later whether it works for you...


Takashi


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