aboutsummaryrefslogtreecommitdiff
path: root/Documentation/sound/oss/sonicvibes
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /Documentation/sound/oss/sonicvibes
downloadlinux-stericsson-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'Documentation/sound/oss/sonicvibes')
-rw-r--r--Documentation/sound/oss/sonicvibes81
1 files changed, 81 insertions, 0 deletions
diff --git a/Documentation/sound/oss/sonicvibes b/Documentation/sound/oss/sonicvibes
new file mode 100644
index 000000000000..84dee2e0b37d
--- /dev/null
+++ b/Documentation/sound/oss/sonicvibes
@@ -0,0 +1,81 @@
+/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 (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 both has an OPL compatible FM synthesizer as well as
+a wavetable synthesizer.
+
+I haven't managed so far to get the OPL synth running.
+
+Using the wavetable synthesizer requires allocating
+1-4MB of physically contiguous memory, which isn't possible
+currently on Linux without ugly hacks like the bigphysarea
+patch. Therefore, the driver doesn't support wavetable
+synthesis.
+
+
+No support from S3
+------------------
+
+I do not get any support from S3. Therefore, the driver
+still has many problems. For example, although the manual
+states that the chip should be able to access the sample
+buffer anywhere in 32bit address space, I haven't managed to
+get it working with buffers above 16M. Therefore, the card
+has the same disadvantages as ISA soundcards.
+
+Given that the card is also very noisy, and if you haven't
+already bought it, you should strongly opt for one of the
+comparatively priced Ensoniq products.
+
+
+Thomas Sailer
+t.sailer@alumni.ethz.ch