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