[pulseaudio-discuss] PulseAudio sample type conversion and quality

[Oscar Eriksson]

Thank you for the clarification.

Oscar

On Wed, Mar 31, 2010 at 12:39 PM, Lennart Poettering <lennart at poettering.net
> wrote:

> On Wed, 31.03.10 12:10, Oscar Eriksson (oscar.r.eriksson at gmail.com) wrote:
>
> > Hi,
> >
> > I'm curious about how the conversion from 32-bit float PCM to 16-bit
> fixed
> > PCM is done in PulseAudio. Or is it Alsa that takes care of this
> > conversion?
>
> PA does.
>
> > Are noise shaping and dithering involved?
>
> No and no. I thought about adding at least dithering, but uh, I don't
> think this is really a priority for desktop audio. Dithering is primarily
> relevant for audio production which PA is unsuitable for anyway, and
> the operation is too CPU intensive to do it nonetheless.
>
> (ALSA doesn't do thopse things either in their converters)
>
> > Also, how do I adjust the volume for optimum playback quality when
> playing
> > music? (I want to use the the full dynamic range) Should I use maximum
> ALSA
> > and PulseAudio volume when playing songs that have been normalized
> (Replay
> > Gain)?
>
> For the sliders PA exposes 0dB is at maximum hardware volume, and the
> "base volume" is where the hardware 0dB is, for whatever that means.
>
> Hence normally you want to keep the volume below the base volume, at
> least when the dB labelling of the hardware sliders are correct.
>
> http://pulseaudio.org/wiki/WritingVolumeControlUIs#BaseVolumes
>
> Lennart
>
> --
> Lennart Poettering                        Red Hat, Inc.
> lennart [at] poettering [dot] net
> http://0pointer.net/lennart/           GnuPG 0x1A015CC4
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