Hello, I am a user of Sigma-Tel STAC9227 intel hda based chip. I have studied its documentation, and found that alsa driver doesn't support number of its features. 1) it has "analog loop-back" which means it can mix sound just before it enters ADC0 to output of DAC0 (headphones/front). For me it is the most important feature, since I have a tv card with analog output. 2) it has the ability to "swap" left/right channels, and this can be very useful for LFE/center channel 3) It has a VolumeKnob "widget" , that allows to decrease volume of all DACs _after_ their own volumes were applied, and I think I turn it to "master volume" Those things below aren't supported by windows driver ether, but that doesn't mean we can't support that :-) 4) this chip has 3 ADC, each capable recording from different source, but alsa uses only first. 5) I have 5.1 configuration, so DAC1 is unused. It is possible to connect it to "front" mic, and get 7.1 sound card I think about a option "Use front mic as output", for 3Stack configuration 1,2,3 are easy to implement, since those are just mixer switches. But I have a question about 4: Now the driver has buggy support for second ADC, it record from it, but fails to connect it to any input source, and unmute it. I can fix that and trivially add support for third ADC, but current driver makes all ADCs a sub-streams of a single PCM device. I think that sub-streams are meant to be used only by playback PCMs that have hardware support of mixing, so I feel that is is better to make each ADC to be a separate PCM device, with separate mixer controls (enabled/input source/gain), and I want to ask you whenever you agree with me. Also I noticed that dsnoop chokes on record streams with more that one substream, it fails with error, when I try to open second arecord. Best regards, Maxim Levitsky _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
