At Mon, 24 Nov 2003 12:53:47 -0500, Apostolos Dimitromanolakis wrote: > > Hi, > > here's the new revision of the Audiotrak Prodigy 7.1 driver. The > driver now initializes correctly for the 24.576Mhz crystal and also I > have added some more controls for adc oversampling ratio (in theory > should be changed automatically to 64x at 96Khz sampling rate) and dac > de-emphasis. > > The initialization sequence of the WM8770 has been modified to reduce > the pop noise at startup (now it's almost nono-existant). Also the > volume control updates now only at zero cross automatically to reduce > again the noise when changing volumes. I think the aureon driver should > also benefit from these two so I include a patch for the aureon.c too.
thanks, applied to cvs with minor modifications. i changed the put callback to compare with the old value to avoid the no necessary performance. too often i2c transfer can be problematic when a crazy mixer apps accesses to mixer elements. > Finally there is some misconception in the aureon & prodigy drivers: > the codec chip does not have a Master control as it appears at the > mixer. Instead the master control just updates the 8 volume controls of > the individual DAC at the same time. Probably the best way is to add a > virtual master control (ie that we update the volumes of the dac with > <master attenuation> + <specific channel attenuation> ). well, such a thing should be done on user-space rather than on kernel. let's postpone this until the new highlevel mixer functions become available. > > As I wrote some days ago, the default buffer/period rates that > alsarecord uses at 44.1KHz and lower sampling , locks hard the kernel. > Have no idea what is it/how to fix it whatsoever. hmm, could be the mismatch of cristal rate? i don't find out the critical path in the driver yet. Takashi ------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. Does SourceForge.net help you be more productive? Does it help you create better code? SHARE THE LOVE, and help us help YOU! Click Here: http://sourceforge.net/donate/ _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
