AudioFile

A simple header-only C++ library for reading and writing audio files.

Current supported formats:

WAV
AIFF

Author

AudioFile is written and maintained by Adam Stark.

http://www.adamstark.co.uk

Usage

Create an AudioFile object:

#include "AudioFile.h"

AudioFile<double> audioFile;

Load an audio file:

audioFile.load ("/path/to/my/audiofile.wav");

Get some information about the loaded audio:

int sampleRate = audioFile.getSampleRate();
int bitDepth = audioFile.getBitDepth();

int numSamples = audioFile.getNumSamplesPerChannel();
double lengthInSeconds = audioFile.getLengthInSeconds();

int numChannels = audioFile.getNumChannels();
bool isMono = audioFile.isMono();
bool isStereo = audioFile.isStereo();

// or, just use this quick shortcut to print a summary to the console
audioFile.printSummary();

Access the samples directly:

int channel = 0;
int numSamples = audioFile.getNumSamplesPerChannel();

for (int i = 0; i < numSamples; i++)
{
	double currentSample = audioFile.samples[channel][i];
}

Replace the AudioFile audio buffer with another

// 1. Create an AudioBuffer 
// (BTW, AudioBuffer is just a vector of vectors)

AudioFile<double>::AudioBuffer buffer;

// 2. Set to (e.g.) two channels
buffer.resize (2);

// 3. Set number of samples per channel
buffer[0].resize (100000);
buffer[1].resize (100000);

// 4. do something here to fill the buffer with samples, e.g.

#include <math.h> // somewhere earler (for M_PI and sinf())

// then...

int numChannels = 2;
int numSamplesPerChannel = 100000;
float sampleRate = 44100.f;
float frequency = 440.f;

for (int i = 0; i < numSamplesPerChannel; i++)
{
    float sample = sinf (2. * M_PI * ((float) i / sampleRate) * frequency) ;
    
    for (int channel = 0; channel < numChannels; channel++)
         buffer[channel][i] = sample * 0.5;
}

// 5. Put into the AudioFile object
bool ok = audioFile.setAudioBuffer (buffer);

Resize the audio buffer

// Set both the number of channels and number of samples per channel
audioFile.setAudioBufferSize (numChannels, numSamples);

// Set the number of samples per channel
audioFile.setNumSamplesPerChannel (numSamples);

// Set the number of channels
audioFile.setNumChannels (int numChannels);

Set bit depth and sample rate

audioFile.setBitDepth (24);
audioFile.setSampleRate (44100);

Save the audio file to disk

// Wave file (implicit)
audioFile.save ("path/to/desired/audioFile.wav");

// Wave file (explicit)
audioFile.save ("path/to/desired/audioFile.wav", AudioFileFormat::Wave);

// Aiff file
audioFile.save ("path/to/desired/audioFile.aif", AudioFileFormat::Aiff);

Examples

Please see the examples folder for some examples on library usage.

A Note On Types

AudioFile is a template class and so it can be instantiated using floating point precision:

AudioFile<float> audioFile;

...or double precision:

AudioFile<double> audioFile;

This simply reflects the data type you would like to use to store the underlying audio samples. You can still read or write 8, 16 or 24-bit audio files, regardless of the type that you use (unless your system uses a precision for floats less than your desired bit depth).

I have heard of people using the library with other types, but I have not designed for those cases. Let me know if you are interested in this supporting a specific type more formally.

Error Messages

By default, the library logs error messages to the console to provide information on what has gone wrong (e.g. a file we tried to load didn't exist).

If you prefer not to see these messages, you can disable this error logging behaviour using:

audioFile.shouldLogErrorsToConsole (false);

Versions

1.0.8 - 18th October 2020

CMake support
Construct instances with a file path
Bug fixes

1.0.7 - 3rd July 2020

Support for 32-bit audio files
Support for multi-channel audio files
Reading/writing of iXML data chunks

1.0.6 - 29th February 2020

Made error logging to the console optional
Fixed lots of compiler warnings

1.0.5 - 14th October 2019

Added include of to better support Visual Studio

1.0.4 - 13th October 2019

Changed to a header-only library. Now you can just include AudioFile.h
Bug fixes

1.0.3 - 28th October 2018

Bug fixes
Documentation updates

1.0.2 - 6th June 2017

Bug fixes

Contributions

Multichannel (i.e. >2 channels) audio file support (Sidelobe)
Read/write of iXML data chunks (mynameisjohn)
Remove warnings (Abhinav1997)
Better support on Ubuntu (BenjaminHinchliff)

Want to Contribute?

If you would like to submit a pull request for this library, please do! But kindly follow the following simple guidelines...

Make the changes as concise as is possible for the change you are proposing
Avoid unnecessarily changing a large number of lines - e.g. commits changing the number of spaces in indentations on all lines (and so on)
Keep to the code style of this library which is the JUCE Coding Standards

License

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

helloimmatt/AudioFile