At 11 Mar 2003 10:04:18 +0100, Thomas Charbonnel wrote: > > Hi, > > As you may know the hdsp has a variable number of channels depending on > the sample rate. The card's internal routing is controlled by a matrix > mixer. For convenience simple mixer ctls are defined at card > initialization. When the number of channels change, I flag the .access > field of the unused ctls with SNDRV_CTL_ELEM_READ and > SNDRV_CTL_ELEM_INACTIVE. It seems to work fine with amixer (amixer > controls doesn't show anymore the unused channels), but alsamixer gives > the following error: function snd_mixer_load failed: Invalid argument. > Any idea on what is going wrong ? > > Another point: the matrix mixer is now (with patch II from Paul) > read/write. In write mode it takes 3 parameters: > source,destination,gain. With the amixer patch I submitted some days ago > it is possible to actually read it, passing source and destination > channels as parameters to the cget option. In the driver, the return > values use the same structure as the parameters. Should I respect the > parameters index (returning the gain value in value[2]) or should I > consider that return values start at value[0] ?
IIRC, the indirect access is still not implemented as a standard way of control API. i myself like it better than the linear addressing of thousands of mixer elements for the matrix mixer. but it's not the standard way, yet, and we need again a discussion to convince other people to allow that... hence i'd like to propose to postpone this after 0.9.0-final release. Takashi ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
