Re: [Alsa-user] Dolby Surround/ProLogic output?
At Fri, 18 Aug 2006 14:39:42 -0700 (PDT),
Rob Jensen wrote:
Would this work even if my soundcard does not have a pcm channel? I
have a Soundblaster Live! 24-bit, which uses the ca0106 driver instead
of the emu10k1, and instead of pcm, master and the like, I have IEC958
and Analog as my only real volume controls through any mixer
applications.
It's quite irrelevant question. DPL is a technique to pack 4 channels
into 2 channels but still as an audiible data unlike AC3 or DTS.
So, basically this encoding always work if you can play a 2-channel
audio stream.
Takashi
Rob
--- Takashi Iwai [EMAIL PROTECTED] wrote:
At Fri, 18 Aug 2006 13:09:46 +0200,
I wrote:
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.)
s/alsa-lib/alsa-plugins/
Takashi
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Re: [Alsa-user] Dolby Surround/ProLogic output?
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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Re: [Alsa-user] Dolby Surround/ProLogic output?
At Fri, 18 Aug 2006 13:09:46 +0200,
I wrote:
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.)
s/alsa-lib/alsa-plugins/
Takashi
-
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