[pulseaudio-discuss] always resampling to float32le?

[sladivadi]

Hi,
thanks for explaining Lennart. :)

Regards,
Sladi

On Wed, 5 Aug 2009 20:18:32 +0200, Lennart Poettering
<lennart at poettering.net> wrote:
> On Wed, 05.08.09 20:11, sladivadi (sladivadi at verat.net) wrote:
> 
>> Hi,
>>
>> I wonder what sample format I should use in order to minimize resampling
>> across various module-combine and module-remap sinks.
>> I specified rate=s32le for all virtual sinks I use since my hardware
> seems
>> to only open like this when specifiyong a 32bit or 24bit format. 24bit
> is
>> what my hardware actually supports (Realtek RC888).
> 
> Very often 24bit means the 24 MSB of 32bit integer words, which PA
> then exposes as s32 NE. How many of those bits are actually used are
> exported as properties on the sink device however. (but even that is
> not really that reliable, since DAC's generally cannot do more than
> 20-22 bit. Thre's a physical limit somewhere in that area)
> 
>> However when looking at output of pulseaudio -v I see:
>> I: resampler.c: Using float32le as working format.
>>
>> Is PS resampling two times from for example 16bit to s32le to float32le?
> 
> The speex resampler can only do 16bit integer NE and 32bit float
> NE. That means we need to convert to either of these two formats
> before doing the resampling step.
> 
> Lennart
> 
> --
> Lennart Poettering                        Red Hat, Inc.
> lennart [at] poettering [dot] net
> http://0pointer.net/lennart/           GnuPG 0x1A015CC4
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