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yaml --- r: 62053 b: refs/heads/master c: 1919de0 h: refs/heads/master i: 62051: 94ac806 v: v3
git-mirror · Jul 20, 2007 · 524fda5 · 524fda5
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diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
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-refs/heads/master: 3b194401a31b8df9a07a1850e3fe44fc7ba832a4
+refs/heads/master: 1919de0a9e939ef4f9453ef1630ca1345991e144
diff --git a/trunk/Documentation/sound/alsa/OSS-Emulation.txt b/trunk/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
 ====================