Hello, Sorry Bad news. the encoding and decodng performance of bluez's SBC is really bad. I just used the latest sbcenc program from bluez-4.17 and compared it to the reference Attached you will find wav-files encoded with the Bluetooth reference implementation and bluez Filelist ======== compare.sh is the scrip that I use to compare both codec versions refsop01.wav the original sample tmp.ref.sbc with reference encoded tmp.bluez.sbc with bluez encoded tmp.ref.sw.wav with reference encoded and decoded (has good quality) tmp.bluez.sw.wav with bluez encoded and decoded (has bad quality ODG=) tmp.refbluez.sw.wav with reference encoded and with bluez decoded (has bad quality) tmp.bluezref.sw.wav with bluez encoded and with reference decoded (has medium quality) Both the bluez encoder and decoder do not work as good as the reference implementation. I also conducted some perceptual audio tests with ITU BS.1387 (PEAQ), which confirm these results. With best regards, Christian PS: Attached also an enhanced version for sbc/sbcenc.c, which considers more command line options. > -----Original Message----- > From: Marcel Holtmann [mailto:marcel@xxxxxxxxxxxx] > Sent: Monday, October 27, 2008 8:42 PM > To: BlueZ development > Subject: Re: Bad encoding performance of Linux SBC audio > codec > > Hi Brad, > > > > I am sorry to say that the audio quality of the open source version > of SBC > > > is far worse than the reference implementation. > > > > If you are using the standalone "sbc" project at sourceforge, then > you > > should try the version inside bluez. The standalone used to simply be > > slower, but we identified & fixed some quality issues too that should > > be backported. > > the standalone version should not be used at all at the moment. All > efforts should go into the version included in bluez-4.x.tar.gz. > > Regards > > Marcel > > > > ----------------------------------------------------------------------- > -- > This SF.Net email is sponsored by the Moblin Your Move Developer's > challenge > Build the coolest Linux based applications with Moblin SDK & win great > prizes > Grand prize is a trip for two to an Open Source event anywhere in the > world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > Bluez-devel mailing list > Bluez-devel@xxxxxxxxxxxxxxxxxxxxx > https://lists.sourceforge.net/lists/listinfo/bluez-devel
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