Thanks for the advice.. Couple of inline questions below.. > -----Original Message----- > > I am new to ALSA, so some help from experienced folks would help.. > > > > We are trying to develop ALSA support for our DSP based mixer. In our > > architecture DSP performs the mixing, sample rate conversion etc. My > > question is how, can does the user space applications exercise > > controlling individual PCM stream to the mixer? Ex: individual stream > > gain control, individual stream mute, etc.. Any user space example code > > would be useful too.. > > Most drivers create PCM volume controls with IFACE_PCM tag, and set up > the volume appropriately at each PCM open, or let alsa-lib configs to > set up the initial volumes. Usually, the control element index > corresponds to the PCM substream number. Which alsa library API lets us to set up the PCM stream volume? And can it be used dynamically when the stream is active? I could n't figure out 'index' of the control element. Can you please explain which parameter of the 'struct snd_ctl_elem_value' you are referring to.. > > The controls with IFACE_PCM are not visible from normal mixer apps. > (The mixer sees only IFACE_MIXER elements.) So, if you need a dynamic > control of such elements, you'll likely need a special program to > access the corresponding elements. > > > Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
