path: root/Documentation/sound/oss/btaudio
diff options
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/btaudio
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/btaudio')
1 files changed, 92 insertions, 0 deletions
diff --git a/Documentation/sound/oss/btaudio b/Documentation/sound/oss/btaudio
new file mode 100644
index 000000000000..1a693e69d44b
--- /dev/null
+++ b/Documentation/sound/oss/btaudio
@@ -0,0 +1,92 @@
+people start bugging me about this with questions, looks like I
+should write up some documentation for this beast. That way I
+don't have to answer that much mails I hope. Yes, I'm lazy...
+You might have noticed that the bt878 grabber cards have actually
+_two_ PCI functions:
+$ lspci
+[ ... ]
+00:0a.0 Multimedia video controller: Brooktree Corporation Bt878 (rev 02)
+00:0a.1 Multimedia controller: Brooktree Corporation Bt878 (rev 02)
+[ ... ]
+The first does video, it is backward compatible to the bt848. The second
+does audio. btaudio is a driver for the second function. It's a sound
+driver which can be used for recording sound (and _only_ recording, no
+playback). As most TV cards come with a short cable which can be plugged
+into your sound card's line-in you probably don't need this driver if all
+you want to do is just watching TV...
+Driver Status
+Still somewhat experimental. The driver should work stable, i.e. it
+should'nt crash your box. It might not work as expected, have bugs,
+not being fully OSS API compilant, ...
+Latest versions are available from http://bytesex.org/bttv/, the
+driver is in the bttv tarball. Kernel patches might be available too,
+have a look at http://bytesex.org/bttv/listing.html.
+The chip knows two different modes. btaudio registers two dsp
+devices, one for each mode. They can not be used at the same time.
+Digital audio mode
+The chip gives you 16 bit stereo sound. The sample rate depends on
+the external source which feeds the bt878 with digital sound via I2S
+interface. There is a insmod option (rate) to tell the driver which
+sample rate the hardware uses (32000 is the default).
+One possible source for digital sound is the msp34xx audio processor
+chip which provides digital sound via I2S with 32 kHz sample rate. My
+Hauppauge board works this way.
+The Osprey-200 reportly gives you digital sound with 44100 Hz sample
+rate. It is also possible that you get no sound at all.
+analog mode (A/D)
+You can tell the driver to use this mode with the insmod option "analog=1".
+The chip has three analog inputs. Consequently you'll get a mixer device
+to control these.
+The analog mode supports mono only. Both 8 + 16 bit. Both are _signed_
+int, which is uncommon for the 8 bit case. Sample rate range is 119 kHz
+to 448 kHz. Yes, the number of digits is correct. The driver supports
+downsampling by powers of two, so you can ask for more usual sample rates
+like 44 kHz too.
+With my Hauppauge I get noisy sound on the second input (mapped to line2
+by the mixer device). Others get a useable signal on line1.
+some examples
+* read audio data from btaudio (dsp2), send to es1730 (dsp,dsp1):
+ $ sox -w -r 32000 -t ossdsp /dev/dsp2 -t ossdsp /dev/dsp
+* read audio data from btaudio, send to esound daemon (which might be
+ running on another host):
+ $ sox -c 2 -w -r 32000 -t ossdsp /dev/dsp2 -t sw - | esdcat -r 32000
+ $ sox -c 1 -w -r 32000 -t ossdsp /dev/dsp2 -t sw - | esdcat -m -r 32000
+Have fun,
+ Gerd
+Gerd Knorr <kraxel@bytesex.org>