Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=1919de0a9e939ef4f9453ef1630ca1345991e144
Commit: 1919de0a9e939ef4f9453ef1630ca1345991e144
Parent: 3b194401a31b8df9a07a1850e3fe44fc7ba832a4
Author: Alan Horstmann <[EMAIL PROTECTED]>
AuthorDate: Mon Jun 4 23:11:23 2007 +0200
Committer: Jaroslav Kysela <[EMAIL PROTECTED]>
CommitDate: Fri Jul 20 11:11:23 2007 +0200
[ALSA] More description on duplex streams with OSS emulation
Add paragraph to the OSS document to clarify correct use of duplex streams.
Signed-off-by: Alan Horstmann <[EMAIL PROTECTED]>
Signed-off-by: Takashi Iwai <[EMAIL PROTECTED]>
Signed-off-by: Jaroslav Kysela <[EMAIL PROTECTED]>
---
Documentation/sound/alsa/OSS-Emulation.txt | 15 +++++++++++++++
1 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/Documentation/sound/alsa/OSS-Emulation.txt
b/Documentation/sound/alsa/OSS-Emulation.txt
index ec2a025..bfa0c9a 100644
--- a/Documentation/sound/alsa/OSS-Emulation.txt
+++ b/Documentation/sound/alsa/OSS-Emulation.txt
@@ -278,6 +278,21 @@ current mixer configuration by reading and writing the
whole file
image.
+Duplex Streams
+==============
+
+Note that when attempting to use a single device file for playback and
+capture, the OSS API provides no way to set the format, sample rate or
+number of channels different in each direction. Thus
+ io_handle = open("device", O_RDWR)
+will only function correctly if the values are the same in each direction.
+
+To use different values in the two directions, use both
+ input_handle = open("device", O_RDONLY)
+ output_handle = open("device", O_WRONLY)
+and set the values for the corresponding handle.
+
+
Unsupported Features
====================
-
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