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Commit 1919de0a authored by Alan Horstmann's avatar Alan Horstmann Committed by Jaroslav Kysela
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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: default avatarAlan Horstmann <gineera@aspect135.co.uk>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
Signed-off-by: default avatarJaroslav Kysela <perex@suse.cz>
parent 3b194401

Documentation/sound/alsa/OSS-Emulation.txt

+15 −0
Original line number Diff line number Diff line
@@ -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

====================