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@@ -278,6 +278,21 @@ current mixer configuration by reading and writing the whole file
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image.
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+Duplex Streams
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+==============
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+
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+Note that when attempting to use a single device file for playback and
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+capture, the OSS API provides no way to set the format, sample rate or
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+number of channels different in each direction. Thus
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+ io_handle = open("device", O_RDWR)
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+will only function correctly if the values are the same in each direction.
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+
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+To use different values in the two directions, use both
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+ input_handle = open("device", O_RDONLY)
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+ output_handle = open("device", O_WRONLY)
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+and set the values for the corresponding handle.
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+
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+
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Unsupported Features
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====================
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