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Informations about the package wave
remithefox/wave
A PHP library that helps you create WAVE files
Installation
Composer
Usage
Creating new wave file
You can create wave file by static method Wave::createNew(). e.g.:
More comfortable way to create new wave file is using builder. e.g.:
builder setters:
| setters | default | significance |
|---|---|---|
setNumberOfChannels() |
2 |
number of channels |
setSampleRate() |
44100 |
number of samples per seconds1 |
setBitsPerSample() |
16 |
bits per sample (highly recommend to use 8 or 16) |
setFloatDecorator() |
false |
use float decorator (wave object will be packed in decorator that calculate sample values to float in range -1..1) |
- Sample rate must be at least 2 times grater than the highest frequency to avoid aliasing (Nyquist frequency). Most often sampling frequency is 44.1kHz (44 100Hz) and this sample rate is recommended for music. For human speech sampling frequency must be at least 8kHz (8 000Hz).
Opening existing files
To open exiting file use method Wave::createFromFile()
Float decorator
Whether you use the float decorator or not, you will get an object that implements the interface
RemiTheFox\Wave\WaveInterface. If you use decorator you can read and write float values from -1 to 1,
otherwise you can read and write integer values from 0 to 255 for 8-bit files or from 0 to 65535 for 16-bit files.
Getters
| getter | type | significance |
|---|---|---|
isWritable() |
bool |
returns true if file is writable |
getNumberOfChannels() |
int |
returns number of channels |
getSampleRate() |
int |
returns number of sample per second |
getBytesPerSecond() |
int |
returns number of data bytes per second |
getBytesPerSampleAllChannels() |
int |
returns number of bytes per sample for all channels |
getBitsPerSample() |
int |
returns number of bits of sample value for single channel |
getBytesPerSample() |
int |
returns number of bytes per sample for single channel |
getNumberOfSamples() |
int |
returns number of samples |
getPosition() |
int |
returns number of current sample |
Navigation in file
Seeking
To seek use method WaveInterface::seek()
NOTICE: first sample has number 0.
Getting current position
to get current position use method WaveInterface::getPosition()
NOTICE: first sample has number 0.
Human friendly time
Position of some specified time depends on file sample rate, so if you want to go to sample on 1:30 you need to go to
sample number Fs*90. It isn't comfortable, so you can use method WaveInterface::time() e.g.:
method takes 2 or 3 arguments:
| argument | type | required | significance |
|---|---|---|---|
| minutes | float | YES | number of minutes |
| seconds | float | YES | number of seconds |
| samples | int | NO | offset in samples |
Reading
To read use method WaveInterface::read() e.g.:
Method returns array of values of all channels in single sample and goes one sample forward.
Writing
To write use method WaveInterface::write() e.g.:
Method write values of all channels in single sample and goes one sample forward. Values should be supplied as array.
Array access and iterating
\RemiTheFox\Wave\WaveInterface extends \ArrayAccess and \Iterator so you can use it as array.
Array access
Iterating
Generators
You can use method WaveInterface::toGenerator() to create generator which yields samples.
Method can be called with start sample number in argument or without arguments (starts from file begin). e.g.:
You can also use some other generator (or any other iterable type) to write samples using method WaveInterface::toGenerator(). e.g.:
Exceptions
All exceptions are in namespace \RemiTheFox\Wave\Exception implements
\RemiTheFox\Wave\Exception\WaveExceptionInterface.
| exception | significance |
|---|---|
| CannotCreateFileException | Cannot create file. It can be caused for example by permissions or lack of disk space. |
| CannotOpenFileException | Error during opening file. |
| FileIsNotReadableException | Cannot open file. File is not readable. |
| FileIsNotWritableException | Cannot write to file. File is not writable. |
| FileNotFoundException | File not exists. |
| FloatDecoratorNotFound | Cannot decorate file other than 8-bit and 16-bit. |
| FormatNotSupportedException | Wave file format is other than PCM. |
| HeaderCorruptedException | Wave file header is corrupted. Header markers not found. |
| HeaderDataInconsistentException | Wave file header data is inconsistent. |
| NotApplicableBitPerSampleException | Tried to decorate Wave object using wrong decorator. |
long text? ASCII-fox:
