Open, read and write Wave files
Open, read and write Wave files
PyWave is a small extension that enables you to open and read the data of any WAVE-RIFF file.
It supports PCM, IEEE-FLOAT, EXTENSIBLE and a few other wave formats (including 32 and 64 bit waves).
It can also create and write wave files, but it's currently limited to PCM-Waves and pure data (no metadata).
PyWave is supposed to replace the builtin Python extension
wave, which doesn't support >16-bit wave files.
To install PyWave you can use the PyPI:
pip install PyWave
To use PyWave in a script, you have to import the package
or a wildcard import:
from PyWave import *
The Wave class
You can use
open(path) to open and read a wave file.
Or you can use
open(path[, mode = 'r', channels = 2, frequency = 48000, bits_per_sample = 16, format = WAVE_FORMAT_PCM])
with <mode> set to
'w' to open and create a writable wave file.
Both will return an instance of the
The following methods are provided by the
Wave.read([max_bytes = None]) -> <bytes> data Reads and returns at most <max_bytes> bytes of data. If <max_bytes> is None, reads until the end. Wave.read_samples(number_of_samples) -> <bytes> data Reads and returns at most <number_of_samples> samples of data. Wave.write(data) -> None Writes <data> to the data chunk of the wave file. Before write can be called, the following members have to be set: - Wave.channels - Wave.frequency - Wave.bits_per_sample This function can only append to the end of the data chunk, thus it is not effected by 'seek()'. Wave.seek(offset[, whence = 0]) -> None Sets the current position in the data stream. If <whence> is 0, <offset> is the absolute position of the data stream in bytes. If <whence> is 1, <offset> is added to the current position in the data stream in bytes. If <whence> is 2, the position will be set to the end of the file plus <offset>. Wave.tell() -> <int> position Returns the current position in the data stream. Wave.close() -> None Closes the file handle.
And it has the following members:
Wave.format <int> Format of the audio data. Can be any of: - WAVE_FORMAT_PCM - WAVE_FORMAT_IEEE_FLOAT - WAVE_FORMAT_ALAW - WAVE_FORMAT_MULAW - WAVE_FORMAT_EXTENSIBLE Otherwise the format is unknown Wave.channels <int> The number of audio channels present in the audio stream Wave.frequency <int> Sample rate of the audio stream Wave.bitrate <int> Number of bits per second Wave.bits_per_sample <int> Number of bits per sample (usually 8, 16 or 32) Wave.samples <int> Total number of samples in the audio data Wave.data <bytes> [Deprecated] (only exists if <auto_read> was set to True) Audio data as bytes Wave.metadata <dict> A dictionary containing metadata specified in the wave file
import PyWave PATH = "path/to/a/wave/file.wav" wf = PyWave.open(PATH) print("This WAVE file has the following properties:") print(wf.channels, "channels") print(wf.frequency, "Hz sample rate") print(wf.bitrate, "bits per second") print(wf.samples, "total samples") wf_copy = PyWave.open("path/to/a/wave/file_copy.wav", mode = "w", channels = wf.channels, frequency = wf.frequency, bits_per_sample = wf.bits_per_sample, format = wf.format) wf_copy.write(wf.read()) wf.close() wf_copy.close()
PyTest support has been added in the form of a test_pywave.py module, in order to facilitate extensions to the module. In order to use it, one should install PyTest first by running:
pip install -r pytest_requirements.txt
Once installed, you should be able to simply run
In the repo folder, and see 2 items being collected, and 2 tests passing.
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