kernel-packages team mailing list archive

[David Henningsson <1286021@xxxxxxxxxxxxxxxxxx>]

> pulseaudio assume surround21 is four channels

For PulseAudio, surround21 is now three channels. It's mapped to four
channels in alsa-lib, exactly which four channels is based on chmap
information from the kernel.

> Does it mean that test with 5.1 downmix to surround21 ?

Yes I believe 5.1 would be downmixed to 2.1.

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https://bugs.launchpad.net/bugs/1286021

Title:
  2.1 surround support (userspace)

Status in “alsa-lib” package in Ubuntu:
  Fix Committed
Status in “pulseaudio” package in Ubuntu:
  In Progress

Bug description:
  2.1 surround should work as seamlessly as other surround options, such
  as 4.0, 5.1 and 7.1 work today.

  Alsa-lib and pulseaudio patches for 14.04 can be tested here:

  https://launchpad.net/~diwic/+archive/surround21

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