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[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 <gineera@aspect135.co.uk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
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Alan Horstmann 2007-06-04 23:11:23 +02:00 committed by Jaroslav Kysela
parent 3b194401a3
commit 1919de0a9e
1 changed files with 15 additions and 0 deletions
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Documentation/sound/alsa/OSS-Emulation.txt
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@ -278,6 +278,21 @@ current mixer configuration by reading and writing the whole file
image. 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 Unsupported Features
==================== ====================