[alsa-devel] ALSA concurrent use case for 5.1 LPCM on HDMI.

gsantosh at codeaurora.org gsantosh at codeaurora.org
Wed Jul 25 10:37:02 CEST 2012

Hi All,

I have following use case I am facing an issue with the ALSA framework,

Consider a use case

1)	System tone or any stream running on Front End 0 with stereo channel
configuration On Back End 0(HDMI)
2)	Start a local file playback for 5.1 LPCM on Front End 1 with 5.1
channel configuration On Back End 0(HDMI)

Here FE0 and FE1 is routed to same BE0.

When step 2 is done I see following behavior of ALSA which is not correct.
Framework will check that the BE0 is running with FE0 routed and running,
Framework will not trigger the fixup and hw_params callback to re
configure the session for FE1 with 5.1 channel.

With this effect we are playing the FE1 session with stereo instead of 5.1
channel configuration, how to rectify this issue?

Santosh M G.

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