wavfile 2.2.0

Read/write wave audio files to/from lists of native Python types.

wavfile

A lightweight library to read/write wave audio files to/from lists of native Python types.

The library is currently limited to PCM (integer) formats but supports arbitrary precision, including 16-, 24-, 32-, and 64-bit samples.

Usage: reading wave files

f = wavfile.open(file, 'r')

where file is either a path to a wave file or a pointer to an open file. This returns a wavfile.wavread.WavRead object with the following properties:

• num_channels - The number of audio channels in the stream.
• sample_rate - The sampling rate/frequency of the audio stream.
• bits_per_sample - The number of bits per audio sample.
• num_frames - The total number of audio frames in the audio stream. A frame is a block of samples, one for each channel, corresponding to a single sampling point.

The object also has the following methods:

• read_int([N]) - Read, at most, N frames from the audio stream in their unmodified integer format. The method returns a list of lists with size (N,C), where C is the number of audio channels. Excluding N, choosing N = None or N < 0 will read all remaining samples.
• read_float([N]) - This method is identical to read_int() except that it returns the samples as floats in the range [-1, 1).
• iter_int([N]) - Similar to read_int() but used in iterator contexts to read successive groups of audio frames.
• iter_float([N]) - Similar to read_float() but used in iterator contexts to read successive groups of audio frames.
• seek(N [, whence]) - Move to the N^th frame in the audio stream; whence sets the positioning: 0 (default) = absolute positioning, 1 = relative to current position, 2 = relative to end of last frame.
• tell() - Return the current frame in the audio stream.
• close() - Close the instance.

Alternatively, the following shortcut function is provided:

audio, sample_rate, bits_per_sample = wavfile.read(file, fmt='int')

where fmt is 'int' or 'float', and audio is the audio data. The function reads all audio data in the file.

Usage: writing wave files

f = wavfile.open(file, 'w',
                 sample_rate=44100,
                 num_channels=None,
                 bits_per_sample=16)

where sample_rate is the sampling rate for the new file, num_channels is the number of audio channels, and bits_per_sample is the number of bits used to encode each sample. If num_channels is unspecified it will be determined automatically from the first block of samples that are written (see below). This returns a wavfile.wavwrite.WavWrite object. The object shares its properties with the wavfile.wavread.WavRead class. The object also offers the same seek(), tell(), and close() methods. In addition, the following methods are provided for writing audio data:

• write(audio) - Write frames of audio data to the audio file. The data should be contained in a list of lists with size (N,C), where N is the number of frames and C is the number of audio channels. If the data are floats then they should be in the range [-1, 1). They will be converted automatically. Integers will be written directly.

Alternatively, the following shortcut function is provided:

wavfile.write(file, audio, sample_rate=44100, bits_per_sample=16)

where audio is the audio data to write to the file.

Installation

From source:

python -m pip install -e --user .

From PyPI:

python -m pip install --user wavfile

License

wavfile is available under the MIT license. See LICENSE.txt for more information.