More information, still not success...
On Wed, Sep 12, 2012 at 2:19 PM, Daniel Mack <[email protected]> wrote:
> I suggest using aplay for that kind of test. It's the simplest client I
> can think of, and the less logic you have in the chain the better.
Ok, using aplay -L I seem to have a lot of alternatives for this device.
I decided to avoid the default, surround, ied958, dmix and dsnoop ones.
(that dsnoop thing sounds interesting, but anyway).
That leaves me with three "hw" and three "plughw" interfaces.
hw:CARD=Interface,DEV=0
Schiit USB Interface, USB Audio
Direct hardware device without any conversions
hw:CARD=Interface,DEV=1
Schiit USB Interface, USB Audio #1
Direct hardware device without any conversions
hw:CARD=Interface,DEV=2
Schiit USB Interface, USB Audio #2
Direct hardware device without any conversions
plughw:CARD=Interface,DEV=0
Schiit USB Interface, USB Audio
Hardware device with all software conversions
plughw:CARD=Interface,DEV=1
Schiit USB Interface, USB Audio #1
Hardware device with all software conversions
plughw:CARD=Interface,DEV=2
Schiit USB Interface, USB Audio #2
Hardware device with all software conversions
Still on the "bit perfect" goal, I decided to try the hw interfaces.
The 44.1 / 16bit file works fine on hw:CARD=Interface,DEV=0 but there
is no sound on hw:CARD-interface,DEV=1 nor ...DEV=2.
The 192 / 24bit file errors out on all the hw: interfaces, eg:
clh@nice:~/WavTest$ sudo aplay -D hw:CARD=Interface,DEV=0 2L*.wav
Home directory /home/clh not ours.
Playing WAVE '2L38_01_192kHz.wav' : Signed 24 bit Little Endian in
3bytes, Rate 192000 Hz, Stereo
aplay: set_params:1081: Sample format non available
Available formats:
- S16_LE
- S32_LE
Ok, I don't want to turn 24 bits into 16, so I decided to try the plughw with
the 192 / 24 file.
Eww there is that weirdly distorted version of Mozart's Violin
Concerto in D major
(sounds more like a bass kazoo than a violin)
CTRL-C and tried again: all good!
I can get it back to not working by playing a 44.1 / 16 file (once to get fuzz,
twice to get proper sound). So here we are, back with the bass kazoo version
and the "-v" flag on aplay:
clh@nice:~/WavTest$ sudo aplay -D plughw:CARD=Interface,DEV=0 -v 2L*.wav
Home directory /home/clh not ours.
Playing WAVE '2L38_01_192kHz.wav' : Signed 24 bit Little Endian in
3bytes, Rate 192000 Hz, Stereo
Plug PCM: Linear conversion PCM (S32_LE)
Its setup is:
stream : PLAYBACK
access : RW_INTERLEAVED
format : S24_3LE
subformat : STD
channels : 2
rate : 192000
exact rate : 192000 (192000/1)
msbits : 24
buffer_size : 96000
period_size : 24000
period_time : 125000
tstamp_mode : NONE
period_step : 1
avail_min : 24000
period_event : 0
start_threshold : 96000
stop_threshold : 96000
silence_threshold: 0
silence_size : 0
boundary : 1572864000
Slave: Hardware PCM card 1 'Schiit USB Interface' device 0 subdevice 0
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S32_LE
subformat : STD
channels : 2
rate : 192000
exact rate : 192000 (192000/1)
msbits : 32
buffer_size : 96000
period_size : 24000
period_time : 125000
tstamp_mode : NONE
period_step : 1
avail_min : 24000
period_event : 0
start_threshold : 96000
stop_threshold : 96000
silence_threshold: 0
silence_size : 0
boundary : 1572864000
appl_ptr : 0
hw_ptr : 0
To me, the above output seems interesting; aplay
has the idea that all is at 192kHz.
Meanwhile, here is /proc/asound/card1/stream0, where
"something" still seems to think it is playing 176 / 24 data.
clh@nice:/proc/asound/card1$ cat stream0
CMEDIA Schiit USB Interface at usb-0000:00:13.5-5, high speed : USB Audio
Playback:
Status: Running
Interface = 1
Altset = 2
Packet Size = 208
Momentary freq = 176430 Hz (0x16.0dc0)
Feedback Format = 10.14
Packet Size = 0
Momentary freq = 192000 Hz (0x18.0000)
Interface 1
Altset 1
Format: S16_LE
Channels: 2
Endpoint: 5 OUT (ASYNC)
Rates: 44100, 48000, 88200, 96000, 192000
Data packet interval: 125 us
Interface 1
Altset 2
Format: S32_LE
Channels: 2
Endpoint: 5 OUT (ASYNC)
Rates: 44100, 48000, 88200, 96000, 192000
Data packet interval: 125 us
if I crash out of the aplay and start it again, sounds great, and
we get back to the proper 192 momentary frequency in
/proc/asound/card1/stream0
clh@nice:/proc/asound/card1$ cat stream0
CMEDIA Schiit USB Interface at usb-0000:00:13.5-5, high speed : USB Audio
Playback:
Status: Running
Interface = 1
Altset = 2
Packet Size = 208
Momentary freq = 192031 Hz (0x18.0100)
Feedback Format = 8.16
Packet Size = 0
Momentary freq = 192000 Hz (0x18.0000)
Interface 1
Altset 1
Format: S16_LE
Channels: 2
Endpoint: 5 OUT (ASYNC)
Rates: 44100, 48000, 88200, 96000, 192000
Data packet interval: 125 us
Interface 1
Altset 2
Format: S32_LE
Channels: 2
Endpoint: 5 OUT (ASYNC)
Rates: 44100, 48000, 88200, 96000, 192000
Data packet interval: 125 us
I guess I find it weird that aplay thinks it is playing
192kHz data but /proc/asound/card1/stream0 says
it's 172kHz.
The first time. But the second, things seem correct.
Daniel, I'm sorry this is such a pain in the neck!
Thanks for all the help!
--
Monet's Chemist
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