[pulseaudio-discuss] Resampling and format conversion question

Arun Raghavan arun.raghavan at collabora.co.uk
Mon Dec 13 22:05:22 PST 2010

On Thu, 2010-12-09 at 16:02 -0600, abraham duenas wrote: 
> Hello,
> I have one question regarding resampler and working format. I have a
> card which has 48kHz working sampling frequency and s16le format. When
> I play any file at that frequency my understanding is that no
> resampling should take place. I can see on PA logs these:
> resampler.c: Forcing resampler 'copy', because of fixed, identical sample rates.
> resampler.c: Using resampler 'copy'
> resampler.c: Using float32le as working format.
> sink-input.c: Created input 3 "Playback Stream" on input with sample
> spec s16le 2ch 48000Hz and channel map front-left,front-right
> In this 'copy' case what is the "resampler.c: Using float32le as
> working format" for? Is it changing my s16le to float32le?
> Any help would be really appreciated :)

A lot of cards do 44100 and 48000 Hz, and PulseAudio selects 44100 Hz by
default (configurable in /etc/pulse/daemon.conf). Are you sure this is
not the case for you?

Also, is your card set up for stereo output?


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