streaming mp3 decoder
This library implements streaming MP3 decompression using the LAME library.
pip install streamp3
To begin decoding an MP3, construct an MP3Decoder, passing it in a binary
bytes object. You can then access the
num_channels properties for information about the MP3.
from streamp3 import MP3Decoder with open('my.mp3', 'rb') as mp3_file: decoder = MP3Decoder(mp3_file) print(decoder.bit_rate, decoder.sample_rate, decoder.num_channels)
You can then read samples from the stream directly using the
or use the decoder as an iterator. Samples are returned as
which are 16-bit PCM encoded, with samples interleaved across channels. This
example streams an MP3 file to the system speaker using
import pyaudio from streamp3 import MP3Decoder with open('my.mp3', 'rb') as mp3_file: decoder = MP3Decoder(mp3_file) audio = pyaudio.PyAudio() device = audio.get_default_output_device_info() speaker = audio.open(output=True, input_device_index=device['index'], format=pyaudio.paInt16, channels=decoder.num_channels, rate=decoder.sample_rate) for chunk in decoder: speaker.write(chunk)
We generally use pyenv to create virtual environments. The following script creates a virtual environment for the project and installs dependencies.
pyenv install 3.6.4 pyenv virtualenv 3.6.4 streamp3 pip install -r requirements.txt
LAME must also be installed. This can be done on OSX via homebrew.
brew install lame
The project uses setup.py for installation and is deployed to PyPI. The project can be built for installation with the following command:
python setup.py clean --all; rm -r ./dist python setup.py sdist bdist_wheel
The wheel and source distribution can then be uploaded to PyPI using twine.
twine upload --repository-url=https://upload.pypi.org/legacy/ dist/*
Copyright 2018 Pylon, Inc.
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
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