From mboxrd@z Thu Jan 1 00:00:00 1970 From: Takashi Iwai Subject: Re: [PATCH]snd-usb-usx2y 0.8.7: Use macro usb_maxpacket() for portability Date: Wed, 08 Dec 2004 20:32:02 +0100 Message-ID: References: <200412021319.20027.annabellesgarden@yahoo.de> <200412062315.01880.annabellesgarden@yahoo.de> <200412072301.52065.annabellesgarden@yahoo.de> Mime-Version: 1.0 (generated by SEMI 1.14.5 - "Awara-Onsen") Content-Type: text/plain; charset=US-ASCII Return-path: In-Reply-To: <200412072301.52065.annabellesgarden@yahoo.de> Sender: alsa-devel-admin@lists.sourceforge.net Errors-To: alsa-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Karsten Wiese Cc: alsa-devel@lists.sourceforge.net List-Id: alsa-devel@alsa-project.org 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 > <<<< Thanks, applied to the CVS tree now. Please check later whether it works for you... Takashi ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://productguide.itmanagersjournal.com/