Audio Pipe

The Pipe class is an efficient implementation of a FIFO data pipe (also called ringbuffer) that is thread-safe and optimized for audio streaming operations.

• atomicity of read/write operations is insured by mutex locking (pthreads)
• two audio DSP conversions can be applied on both ends (saving on the memory copy operation)
• easily extensible to support more DSP conversion algorithms

This class is being used in MuSE streaming application and just starting to be adopted in FreeJ

• Pipe class documentation
• Pipe header
• Pipe code

The set_output_type and set_input_type take both a string as an argument which is the name of the conversion type adopted in reading (output) and writing (input)

copy_byte	simple memcpy(3) of data, amount is in bytes
copy_int16_to_float	int to float conversion using int/32768.0f
copy_float_to_int16	float to int (16bit) conversion using lrintf(3)
mix_int16_to_int32	sum of a int16 over int32

The Pipe class is released under GNU GPL and is

• Copyright (c) 2001 Charles Samuels <charles \@\ kde.org>
• Copyright (c) 2002 - 2005 Denis Rojo <jaromil \@\ dyne.org>

The latest version can be checked out from subversion at the addresses

• svn://dyne.org/rastasoft/muse/muse-0.9/src/pipe.cpp
• svn://dyne.org/rastasoft/muse/muse-0.9/src/pipe.h

You can mail patches to <jaromil \@\ dyne.org>

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