mirror of https://gitee.com/openkylin/linux.git
71 lines
2.1 KiB
Plaintext
71 lines
2.1 KiB
Plaintext
Recording
|
|
---------
|
|
|
|
Recording does not work on the author's card, but there
|
|
is at least one report of it working on later silicon.
|
|
The chip behaves differently than described in the data sheet,
|
|
likely due to a chip bug. Working around this would require
|
|
the help of ESS (for example by publishing an errata sheet),
|
|
but ESS has not done so so far.
|
|
|
|
Also, the chip only supports 24 bit addresses for recording,
|
|
which means it cannot work on some Alpha mainboards.
|
|
|
|
|
|
/proc/sound, /dev/sndstat
|
|
-------------------------
|
|
|
|
/proc/sound and /dev/sndstat is not supported by the
|
|
driver. To find out whether the driver succeeded loading,
|
|
check the kernel log (dmesg).
|
|
|
|
|
|
ALaw/uLaw sample formats
|
|
------------------------
|
|
|
|
This driver does not support the ALaw/uLaw sample formats.
|
|
ALaw is the default mode when opening a sound device
|
|
using OSS/Free. The reason for the lack of support is
|
|
that the hardware does not support these formats, and adding
|
|
conversion routines to the kernel would lead to very ugly
|
|
code in the presence of the mmap interface to the driver.
|
|
And since xquake uses mmap, mmap is considered important :-)
|
|
and no sane application uses ALaw/uLaw these days anyway.
|
|
In short, playing a Sun .au file as follows:
|
|
|
|
cat my_file.au > /dev/dsp
|
|
|
|
does not work. Instead, you may use the play script from
|
|
Chris Bagwell's sox-12.14 package (or later, available from the URL
|
|
below) to play many different audio file formats.
|
|
The script automatically determines the audio format
|
|
and does do audio conversions if necessary.
|
|
http://home.sprynet.com/sprynet/cbagwell/projects.html
|
|
|
|
|
|
Blocking vs. nonblocking IO
|
|
---------------------------
|
|
|
|
Unlike OSS/Free this driver honours the O_NONBLOCK file flag
|
|
not only during open, but also during read and write.
|
|
This is an effort to make the sound driver interface more
|
|
regular. Timidity has problems with this; a patch
|
|
is available from http://www.ife.ee.ethz.ch/~sailer/linux/pciaudio.html.
|
|
(Timidity patched will also run on OSS/Free).
|
|
|
|
|
|
MIDI UART
|
|
---------
|
|
|
|
The driver supports a simple MIDI UART interface, with
|
|
no ioctl's supported.
|
|
|
|
|
|
MIDI synthesizer
|
|
----------------
|
|
|
|
The card has an OPL compatible FM synthesizer.
|
|
|
|
Thomas Sailer
|
|
t.sailer@alumni.ethz.ch
|