Snakey: Headphones wearing Python

PyAudio

PyAudio provides Python bindings for PortAudio, the cross-platform audio I/O library. With PyAudio, you can easily use Python to play and record audio on a variety of platforms, such as GNU/Linux, Microsoft Windows, and Apple Mac OS X.

PyAudio is inspired by:

What's new

October 19, 2015

PyAudio installation is better streamlined. Install PyAudio on most platforms using pip.

October 18, 2015

PyAudio 0.2.9 is a new release with bug fixes related to overflow error handling and IOError exception arguments.

Many thanks to Tony Jacobson for discovering and helping with the overflow error. Thanks also to Sami Liedes for reporting the IOError exception issue!

April 12, 2014

PyAudio 0.2.8 is a new release with bug fixes related to the Python GIL and device name encoding.

Many thanks to Jason Roehm for discovering and patching the threading-related issue!

More news...

Installation

The current version is PyAudio v0.2.9. Install PyAudio using pip on most platforms. For versions prior to v0.2.9, PyAudio distributed installation binaries, which are archived here.

Microsoft Windows

Install using pip:

python -m pip install pyaudio

Notes:


Apple Mac OS X

Use Homebrew to install the prerequisite portaudio library, then install PyAudio using pip:

brew install portaudio
pip install pyaudio

Notes:


Debian/Ubuntu

Use the package manager to install PyAudio:

sudo apt-get install python-pyaudio python3-pyaudio

If the latest version of PyAudio is not available, install it using pip:

pip install pyaudio

Notes:


PyAudio Source

Source is available for download at the Python Package Index (PyPI): pypi.python.org/pypi/PyAudio.

Or clone the git repository:

git clone http://people.csail.mit.edu/hubert/git/pyaudio.git

To build PyAudio from source, you will also need to build PortAudio v19. See compilation hints for some instructions on building PyAudio for various platforms. To build PyAudio using Microsoft Visual Studio, check out Sebastian Audet's instructions.

Documentation & Examples

Browse the PyAudio API documentation. PyAudio roughly mirrors the PortAudio v19 API 2.0.

The PyAudio source distribution contains a set of demos. Here's a selection from that set:

"""PyAudio Example: Play a WAVE file."""

import pyaudio
import wave
import sys

CHUNK = 1024

if len(sys.argv) < 2:
    print("Plays a wave file.\n\nUsage: %s filename.wav" % sys.argv[0])
    sys.exit(-1)

wf = wave.open(sys.argv[1], 'rb')

p = pyaudio.PyAudio()

stream = p.open(format=p.get_format_from_width(wf.getsampwidth()),
                channels=wf.getnchannels(),
                rate=wf.getframerate(),
                output=True)

data = wf.readframes(CHUNK)

while data != '':
    stream.write(data)
    data = wf.readframes(CHUNK)

stream.stop_stream()
stream.close()

p.terminate()
"""PyAudio example: Record a few seconds of audio and save to a WAVE file."""

import pyaudio
import wave

CHUNK = 1024
FORMAT = pyaudio.paInt16
CHANNELS = 2
RATE = 44100
RECORD_SECONDS = 5
WAVE_OUTPUT_FILENAME = "output.wav"

p = pyaudio.PyAudio()

stream = p.open(format=FORMAT,
                channels=CHANNELS,
                rate=RATE,
                input=True,
                frames_per_buffer=CHUNK)

print("* recording")

frames = []

for i in range(0, int(RATE / CHUNK * RECORD_SECONDS)):
    data = stream.read(CHUNK)
    frames.append(data)

print("* done recording")

stream.stop_stream()
stream.close()
p.terminate()

wf = wave.open(WAVE_OUTPUT_FILENAME, 'wb')
wf.setnchannels(CHANNELS)
wf.setsampwidth(p.get_sample_size(FORMAT))
wf.setframerate(RATE)
wf.writeframes(b''.join(frames))
wf.close()
"""
PyAudio Example: Make a wire between input and output (i.e., record a
few samples and play them back immediately).
"""

import pyaudio

CHUNK = 1024
WIDTH = 2
CHANNELS = 2
RATE = 44100
RECORD_SECONDS = 5

p = pyaudio.PyAudio()

stream = p.open(format=p.get_format_from_width(WIDTH),
                channels=CHANNELS,
                rate=RATE,
                input=True,
                output=True,
                frames_per_buffer=CHUNK)

print("* recording")

for i in range(0, int(RATE / CHUNK * RECORD_SECONDS)):
    data = stream.read(CHUNK)
    stream.write(data, CHUNK)

print("* done")

stream.stop_stream()
stream.close()

p.terminate()
"""PyAudio Example: Play a wave file (callback version)"""

import pyaudio
import wave
import time
import sys

if len(sys.argv) < 2:
    print("Plays a wave file.\n\nUsage: %s filename.wav" % sys.argv[0])
    sys.exit(-1)

wf = wave.open(sys.argv[1], 'rb')

p = pyaudio.PyAudio()

def callback(in_data, frame_count, time_info, status):
    data = wf.readframes(frame_count)
    return (data, pyaudio.paContinue)

stream = p.open(format=p.get_format_from_width(wf.getsampwidth()),
                channels=wf.getnchannels(),
                rate=wf.getframerate(),
                output=True,
                stream_callback=callback)

stream.start_stream()

while stream.is_active():
    time.sleep(0.1)

stream.stop_stream()
stream.close()
wf.close()

p.terminate()
"""
PyAudio Example: Make a wire between input and output (i.e., record a
few samples and play them back immediately).

This is the callback (non-blocking) version.
"""

import pyaudio
import time

WIDTH = 2
CHANNELS = 2
RATE = 44100

p = pyaudio.PyAudio()

def callback(in_data, frame_count, time_info, status):
    return (in_data, pyaudio.paContinue)

stream = p.open(format=p.get_format_from_width(WIDTH),
                channels=CHANNELS,
                rate=RATE,
                input=True,
                output=True,
                stream_callback=callback)

stream.start_stream()

while stream.is_active():
    time.sleep(0.1)

stream.stop_stream()
stream.close()

p.terminate()
"""PyAudio Example: Mac OS X-only: Play a wave file with channel maps."""

import pyaudio
import wave
import sys

chunk = 1024

PyAudio = pyaudio.PyAudio

if len(sys.argv) < 2:
    print("Plays a wave file.\n\nUsage: %s filename.wav" % sys.argv[0])
    sys.exit(-1)

wf = wave.open(sys.argv[1], 'rb')

p = PyAudio()

# standard L-R stereo
# channel_map = (0, 1)

# reverse: R-L stereo
# channel_map = (1, 0)

# no audio
# channel_map = (-1, -1)

# left channel audio --> left speaker; no right channel
# channel_map = (0, -1)

# right channel audio --> right speaker; no left channel
# channel_map = (-1, 1)

# left channel audio --> right speaker
# channel_map = (-1, 0)

# right channel audio --> left speaker
channel_map = (1, -1)
# etc...

try:
    stream_info = pyaudio.PaMacCoreStreamInfo(
        flags=pyaudio.PaMacCoreStreamInfo.paMacCorePlayNice, # default
        channel_map=channel_map)
except AttributeError:
    print("Sorry, couldn't find PaMacCoreStreamInfo. Make sure that "
          "you're running on Mac OS X.")
    sys.exit(-1)

print("Stream Info Flags:", stream_info.get_flags())
print("Stream Info Channel Map:", stream_info.get_channel_map())

# open stream
stream = p.open(
    format=p.get_format_from_width(wf.getsampwidth()),
    channels=wf.getnchannels(),
    rate=wf.getframerate(),
    output=True,
    output_host_api_specific_stream_info=stream_info)

# read data
data = wf.readframes(chunk)

# play stream
while data != '':
    stream.write(data)
    data = wf.readframes(chunk)

stream.stop_stream()
stream.close()

p.terminate()

License

PyAudio is distributed under the MIT License:

Copyright (c) 2006 Hubert Pham

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.

Acknowledgements

The development of PyAudio was funded in part by the Cambridge-MIT Institute and T-Party.

Many thanks to Andrew Baldwin, Alex ThreeD, Timothée Lecomte, Frank Samuelson, Matthieu Brucher, Chris Stawarz, Barry Walker, Bob Jamison, Danilo J. S. Bellini, Bastian Bechtold, Christoph Gohlke, Sebastian Audet, Jason Roehm, Tony Jacobson, and Sami Liedes for their much appreciated suggestions and patches—as well as to others who have written to say hello!

Special thanks to Justin Mazzola Paluska and Felipe Sateler for Debian/Ubuntu packaging help.

Translations

Contact

For help with PyAudio, your best bet for a timely response is to consult or post to StackOverflow.

Comments, suggestions, and patches welcomed. Send mail to my first name at mit.edu.

hubert