A simple header-only C++ library for reading and writing audio files.
Current supported formats:
AudioFile is written and maintained by Adam Stark.
Create an AudioFile object:#include "AudioFile.h"
AudioFile<double> audioFile;
audioFile.load ("/path/to/my/audiofile.wav");
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();
int channel = 0;
int numSamples = audioFile.getNumSamplesPerChannel();
for (int i = 0; i < numSamples; i++)
{
double currentSample = audioFile.samples[channel][i];
}
// 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);
// 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 (numChannels);
audioFile.setBitDepth (24);
audioFile.setSampleRate (44100);
// 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);
Write the audio file data directly to a vector of bytes (without writing to a file on disk):
std::vector<uint8_t> fileData;
audioFile.saveToMemory (fileData, AudioFileFormat::Wave);
or
audioFile.saveToMemory (fileData, AudioFileFormat::Aiff);
Please see the examples folder for some examples on library usage.
AudioFile is a template class and so it can be instantiated using different types to represent the audio samples.
For example, we can use floating point precision...
AudioFile<float> audioFile;
...or double precision...
AudioFile<double> audioFile;
...or an integer type:
AudioFile<int> audioFile;
This simply reflects the data type you would like to use to store the underlying audio samples.
When you use an integer type to store the samples (e.g. int or int8_t or int16_t or uint32_t), the library will read in the integer sample values directly from the audio file.
A couple of notes on integer types:
The range of samples is designed to be symmetric. This means that for (e.g.) an signed 8-bit integer (int8_t) we will use the range [-127, 127] for storing samples representing the [-1., 1.] range. The value -128 is possible here given the int8_t type, but this is interpreted as a value slightly lower than -1 (specifically -1.007874015748).
In the case of unsigned types, we obviously can't store samples as negative values. Therefore, we used the equivalent range of the unsigned type in use. E.g. if with a 8-bit signed integer (int8_t) the range would be [-127, 127], for an 8-bit unsigned integer we would use the range [1, 255]. Note that we don't use -128 for int8_t or 0 in uint8_t.
If you try to read an audio file with a larger bit-depth than the type you are using to store samples, the attempt to read the file will fail. Put more simply, you can't read a 16-bit audio sample into an 8-bit integer.
If you are writing audio samples in integer formats, you should use the correct sample range for both a) the type you are using to store samples; and b) the bit depth of the audio you want to write.
The following table details the sample range for each bit-depth:
Type 8-bit Audio 16-bit Audio 24-bit Audio 32-bit Audiofloat [-1.0, 1.0] [-1.0, 1.0] [-1.0, 1.0] [-1.0, 1.0] double [-1.0, 1.0] [-1.0, 1.0] [-1.0, 1.0] [-1.0, 1.0] int8_t [-127, 127] ❌ (type too small) ❌ (type too small) ❌ (type too small) uint8_t [1, 255] ❌ (type too small) ❌ (type too small) ❌ (type too small) int16_t [-127, 127] [-32767, 32767] ❌ (type too small) ❌ (type too small) uint16_t [1, 255] [1, 65535] ❌ (type too small) ❌ (type too small) int32_t [-127, 127] [-32767, 32767] [-8388607, 8388607] [-2147483647, 2147483647] uint32_t [1, 255] [1, 65535] [1, 16777215] [1, 4294967295] int64_t [-127, 127] [-32767, 32767] [-8388607, 8388607] [-2147483647, 2147483647] uint64_t [1, 255] [1, 65535] [1, 16777215] [1, 4294967295]
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);
Many thanks to the following people for their contributions to this library:
If you would like to submit a pull request for this library, please do! But kindly follow the following simple guidelines...
MIT License
Copyright (c) 2017 Adam Stark
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.
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