Clemens, list:
On Thu, Nov 22, 2012 at 6:50 AM, Clemens Ladisch
<cladisch@xxxxxxxxxxxxxx> wrote:
> chris hermansen wrote:
>> I think I am getting the music resampled somewhere along the way.
>
> Check in /proc/asound/card2/pcm0p/sub0/hw_params what the actual
> rate is.
It appears the rate may be ok, but that the word size is converted to 16 bits.
here is definitinon of hw:2,0 from aplay -L
hw:CARD=Audigy2,DEV=0
SB Audigy 2 ZS Notebook [SB0530, ADC Capture/Standard PCM Playback
Direct hardware device without any conversions
and here is the results of trying to play a 96kHz 24bit wav file on that device:
sudo aplay -v -D hw:2,0 2L*wav
Playing WAVE '2L50SACD_tr1_96k_stereo.wav' : Signed 24 bit Little
Endian in 3bytes, Rate 96000 Hz, Stereo
aplay: set_params:1081: Sample format non available
Available formats:
- U8
- S16_LE
so it seems that when I use plughw instead of hw, the plug converts it
to 96kHz / 16bit.
aplay -v -D plughw:2,0 2L*wav
Playing WAVE '2L50SACD_tr1_96k_stereo.wav' : Signed 24 bit Little
Endian in 3bytes, Rate 96000 Hz, Stereo
Plug PCM: Linear conversion PCM (S16_LE)
Its setup is:
stream : PLAYBACK
access : RW_INTERLEAVED
format : S24_3LE
subformat : STD
channels : 2
rate : 96000
exact rate : 96000 (96000/1)
msbits : 24
buffer_size : 16384
period_size : 4096
period_time : 42666
tstamp_mode : NONE
period_step : 1
avail_min : 4096
period_event : 0
start_threshold : 16384
stop_threshold : 16384
silence_threshold: 0
silence_size : 0
boundary : 1073741824
Slave: Hardware PCM card 2 'SB Audigy 2 ZS Notebook [SB0530' device 0
subdevice 0
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S16_LE
subformat : STD
channels : 2
rate : 96000
exact rate : 96000 (96000/1)
msbits : 16
buffer_size : 16384
period_size : 4096
period_time : 42666
tstamp_mode : NONE
period_step : 1
avail_min : 4096
period_event : 0
start_threshold : 16384
stop_threshold : 16384
silence_threshold: 0
silence_size : 0
boundary : 1073741824
appl_ptr : 0
hw_ptr : 0
>
>> I can use alsamixer to change the volume of the output
>
> What does this have to do with resampling?
Maybe more to do with my ignorance, Clemens, but I had thought that if
I selected the hw:x,y device there was no way to change volume on
things with the mixer.
>
>> the slider called S/PDIF optical raw is marked (off, off)
>
> I don't know what this does. But why don't you enable it?
So I tried enabling that (used the M command in alsamixer) and with
that enabled I get no sound, at least through hw:2,0, though aplay
thinks it's playing something...
--
Chris Hermansen · clhermansen@xxxxxxxxx
C'est ma façon de parler.
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