93 lines
3.6 KiB
Plaintext
93 lines
3.6 KiB
Plaintext
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README for PortAudio Loopback Test
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Copyright (c) 1999-2010 Phil Burk and Ross Bencina
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See complete license at end of file.
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This folder contains code for a single executable that does a standalone test of PortAudio.
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It does not require a human to listen to the result. Instead it listens to itself using
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a loopback cable connected between the audio output and the audio input. Special pop detectors
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and phase analysers can detect errors in the audio stream.
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This test can be run from a script as part of a nightly build and test.
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--- How to Build the Loopback Test ---
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The loopback test is not normally built by the makefile.
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To build the loopback test, enter:
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./configure && make loopback
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This will build the "bin/paloopback" executable.
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--- How To Run Test ---
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Connect stereo cables from one or more output audio devices to audio input devices.
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The test will scan all the ports and find the cables.
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Adjust the volume levels of the hardware so you get a decent signal that will not clip.
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Run the test from the command line with the following options:
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-i# Input device ID. Will scan for loopback if not specified.
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-o# Output device ID. Will scan for loopback if not specified.
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-r# Sample Rate in Hz. Will use multiple common rates if not specified.
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-s# Size of callback buffer in frames, framesPerBuffer.
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-w Save bad recordings in a WAV file.
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-dDir Path for Directory for WAV files. Default is current directory.
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-m Just test the DSP Math code and not the audio devices.
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If the -w option is set then any tests that fail will save the recording of the broken
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channel in a WAV file. The files will be numbered and shown in the report.
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--- ToDo ---
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* Add check for harmonic and enharmonic distortion.
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* Measure min/max peak values.
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* Detect DC bias.
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* Test against matrix of devices/APIs and settings.
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* Detect mono vs stereo loopback.
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* More command line options
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--quick
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--latency
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--duration
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* Automated build and test script with cron job.
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* Test on Windows.
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/*
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* PortAudio Portable Real-Time Audio Library
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* Latest Version at: http://www.portaudio.com
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*
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* Copyright (c) 1999-2008 Phil Burk and Ross Bencina
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* The text above constitutes the entire PortAudio license; however,
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* the PortAudio community also makes the following non-binding requests:
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*
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* Any person wishing to distribute modifications to the Software is
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* requested to send the modifications to the original developer so that
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* they can be incorporated into the canonical version. It is also
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* requested that these non-binding requests be included along with the
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* license above.
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*/
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