On Thu, Sep 15, 2011 at 01:58:41PM +0800, Arun Raghavan wrote: > On Thu, 2011-09-15 at 11:22 +0800, Lu Guanqun wrote: > > On Thu, Sep 08, 2011 at 02:19:41AM +0800, Arun Raghavan wrote: > > > On Wed, 2011-09-07 at 11:09 -0700, Arun Raghavan wrote: > > > > On Wed, 2011-09-07 at 14:20 +0800, Lu Guanqun wrote: > > > > > Hi Arun, > > > > > > > > > > I have several things unclear about passthrough support: > > > > > > > > I'm talking about this work at Linux Plumbers' Conference on Friday. If > > > > videos are available, I'll link to them -- hopefully that should make > > > > the motivation clear. > > > > > > Oh, phew, no video -- I'm still happy to answer any questions you > > > have. :) > > > > Hi Arun, > > > > I've a dumb question... On my laptop, when I use pacat --passthrough > > <some-wav-file>, does it mean the passthrough mode is used? Though it's > > not the usual case as hardware decoding is not used. > > Yes -- all the logic that works with passthrough streams goes via > pa_sink_input_is_passthrough(), which you will see checks if the stream > has non-PCM data OR has the PASSTHROUGH flag set (which is what > --passthrough does). That's cool, thanks for the info. If this ALSA device can hard decode, then in this scenario, it can play, let's say, MP3 file on the fly. :) -- guanqun
