Re: btw

[mark@undertone.org]

On Thu, Oct 17, 2002 at 10:26:48AM +0200, Takashi Iwai wrote:
> ah, since 8000Hz 8 bit is not supported on this device.
> please use plughw instead of hw, that is,
> 
> 	% aplay -Dplughw:1,0 foo.wav

atrophy:~# aplay -Dplughw:1,0 foo.wav
Playing raw data 'foo.wav' : Unsigned 8 bit, Rate 8000 Hz, Mono
ALSA lib pcm_hw.c:428:(snd_pcm_hw_prepare) SNDRV_PCM_IOCTL_PREPARE failed: Invalid argument
aplay: set_params:813: Unable to install hw params:
ACCESS:  RW_INTERLEAVED
FORMAT:  U8
SUBFORMAT:  STD
SAMPLE_BITS: 8
FRAME_BITS: 8
CHANNELS: 1
RATE: 8000
PERIOD_TIME: (124988 124989)
PERIOD_SIZE: (999 1000)
PERIOD_BYTES: (999 1000)
PERIODS: (4 5)
BUFFER_TIME: 500000
BUFFER_SIZE: 4000
BUFFER_BYTES: 4000
TICK_TIME: 10000
atrophy:~# 

I've tried an entire array of different wav's in different formats,
all with similar debugging output.

I've also tried installing various modules and drivers in a vain and
blind attempt to just get it to play the stream. What "is supported"
natively by the driver?

> for the control (mixer) interface, no second zero, that is, use
> '-Dhw:1'.  (btw, it's equitvalent "amixer -c 1").

Yes, I've been able to mix the thing properly now. Thanks. Uh, I'm
guessing the code is the best place to actually get a decent
description why this is?

> > I compiled both controler modules and have tried using them
> > interchangably. Same result. There is no difference in the stream0
> > file - checked with a diff.
> 
> you can check this also via the output of 'lsusb -v'.

Only differences were fairly cosmetic:

atrophy:~/alsa# diff uhci usb-uhci 
15c15
<   iProduct                2 USB UHCI-alt Root Hub
---
>   iProduct                2 USB UHCI Root Hub
50c50
< Bus 001 Device 002: ID 041e:3000 Creative Labs 
---
> Bus 001 Device 005: ID 041e:3000 Creative Labs 

I had to disconnect my minihub and connect only the extigy by itself
in order to use the usb-uhci driver. I normally only use uhci, as I
need to use a usb mouse and the extigy, which requires a hub that
doesnt like usb-uhci.

Given the output above, I'm probably doing something rather silly
again with regards to some kind of random compatibility issue. I am
still running the mixer with the debug hack you put in.

-mark


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