At Wed, 16 Aug 2006 14:21:01 -0700 (PDT),
Rob Jensen wrote:
>
> Does anyone know how to encode the audio out with Dolby Surround? I
> have a receiver that supports Dolby Pro Logic, but not DPL2, and was
> hoping that I could still have surround sound. Ideally, I'd hope that
> everything could be properly configured so that mono sources comes out
> all 5 speakers, stereo sources only come out front left and right, and
> all surround becomes downmixed to Dolby Surround. Right now, however,
> I'd settle for downmixing DTS, Dolby Digital and the like to Dolby
> Surround.
>
> I've searched for something that would do this, but all I found were
> references to a plugin for LADSPA, but have yet to find the actual plugin.
The encoding to DPL (and DPL2) is pretty easy if you have already
discrete channels. Even the recent alsa-lib has a configuration.
First, include pcm/dpl.conf by adding the following to ~/.asoundrc:
<confdir:pcm/dpl.conf>
then define a PCM like below:
pcm.mydpl {
type plug
slave.pcm {
type upmix
slave.pcm "dpl:spdif"
channels 6
}
}
where it outputs to SPDIF from the input with any number of channels.
(This configuration requires upmix plugin included in alsa-lib.)
Now you'll be able to play such as
% aplay -D mydpl somefile.wav
Takashi
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