From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Subject: Re: [Bluez-devel] question: what does this patch from snd-bt-sco do? From: Marcel Holtmann To: Lars Grunewaldt Cc: BlueZ Mailing List In-Reply-To: <40D0DFFE.7020701@dark-reality.de> References: <40A9E6CB.4010505@dark-reality.de> <88307002-A8B9-11D8-A107-000A95A4D990@dcs.gla.ac.uk> <40A9EE51.2080102@dark-reality.de> <1084881439.5833.108.camel@pegasus> <40AA11AB.6010307@dark-reality.de> <1084888843.4327.1.camel@pegasus> <40D0CE71.2010208@dark-reality.de> <1087427168.4309.30.camel@pegasus> <40D0DFFE.7020701@dark-reality.de> Content-Type: text/plain Message-Id: <1087431863.4309.39.camel@pegasus> Mime-Version: 1.0 Sender: bluez-devel-admin@lists.sourceforge.net Errors-To: bluez-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: List-Post: List-Help: List-Subscribe: , List-Archive: Date: Thu, 17 Jun 2004 02:24:24 +0200 Hi Lars, > Now I'm lost again. Is there an audio transcoding somewhere in the SCO > layer, so that I could simply send PCM_S16 and the SCO layer transcodes > the audio if the headset does not support this? I mean there must be a > reason why the original snd-bt-sco developer hardcoded the 8bit format > instead of using 16 bit. the reason was me, because my first SCO test was with a 3Com PCMCIA card and 8bit is less data than 16bit ;) > What about audio quality during transcoding? MULAW sounds much better > than PCM_S8. Default air coding is CVSD with 16bit PCM input coding. > Sorry that I don't fully understand this bluetooth stuff, I'm trying my > best here. :( > > I hope I dont make anyone angry or something... Don't worry, but you should dig through the mailing list archives. You will find some detailed explanations for SCO. > sorry, misunderstanding. I'll make a new version of snd-bt-sco that > builds with alsa-1.0.5a. Nothing for bluez. Feel free to do so. > I'd like to help you out with this dynamic alternate setting adjustment, > but I think I don't know enough usb and/or bluetooth mojo to do anything > usefull. Maybe someone should rewrite the hci_usb driver from scratch. There are more issues with it :( > To make my headset work for now (need my "phone") I used that bad kernel > patch again, but I'll try to do everything to avoid that in the release. > I just have to understand what's going on... I don't see your problem. Simply use 16bit PCM in the ALSA code. Regards Marcel ------------------------------------------------------- This SF.Net email is sponsored by The 2004 JavaOne(SM) Conference Learn from the experts at JavaOne(SM), Sun's Worldwide Java Developer Conference, June 28 - July 1 at the Moscone Center in San Francisco, CA REGISTER AND SAVE! http://java.sun.com/javaone/sf Priority Code NWMGYKND _______________________________________________ Bluez-devel mailing list Bluez-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bluez-devel