[pulseaudio-discuss] "passthrough" audio (eg. AC3 / DTS / WM9)

Achim Frase achim.frase at googlemail.com
Mon Oct 5 02:33:30 PDT 2009

Am Montag, den 05.10.2009, 14:30 +1100 schrieb Dave Moore:
> Hi Everyone.  I'm really sorry if this has been covered before, I've
> read back through the past 6 months list history and found nothing....
> and my OS (ubuntu) and application support forums/lists are not being
> very helpful.
> I would like to pass digital audio completely unaltered ("bit-stream")
> to my SPDIF output - Can this be done with pulseaudio?
> (Yes, I understand that I will lose sound mixing and the ability to
> have multiple application use the sound device)
> For example:
> If I have a stereo PCM file @ 16bit / 44.1khz  -  Then output at this
> type (do not resample in any way) ... or PCM @ 24bit / 96khz .... etc.
> If I have AC3 / DTS @ 48khz - The output this original data exactly.
> (I am using an external decoder/processor and do not want the original
> audio data changed in any way).
> Again - sorry if this is a stupid question, or already answered.  I
> could not find a definitive answer.... I would like to keep pulseaudio
> if possible - as it is what my Linux distro (ubuntu) has set default.
> Thanks in advance.

Take a look at the blog from Lennart.

“Codec handling has been on the TODO list for PA for quite some time,
for the SPDIF or HDMI cases, and Bluetooth Audio is another reason why
we really should have that.”



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