https://github.com/flexrobotics/roboflex_audio_alsa

Roboflex support for reading audio from linux's ALSA.
https://github.com/flexrobotics/roboflex_audio_alsa

alsa roboflex

Last synced: 6 months ago
JSON representation

Roboflex support for reading audio from linux's ALSA.

• Host: GitHub
• URL: https://github.com/flexrobotics/roboflex_audio_alsa
• Owner: flexrobotics
• License: mit
• Created: 2023-10-19T21:00:28.000Z (over 1 year ago)
• Default Branch: main
• Last Pushed: 2023-12-05T20:52:01.000Z (over 1 year ago)
• Last Synced: 2024-11-11T11:33:11.665Z (6 months ago)
• Topics: alsa, roboflex
• Language: C++
• Homepage: https://github.com/flexrobotics/roboflex_audio_alsa
• Size: 27.3 KB
• Stars: 2
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

README

        
# roboflex.audio_alsa

Support for reading audio data on linux from the Advanced Linux Sound Architecture (ALSA).

## System dependencies

Requires ALSA to be installed. More than likely, it already is installed in your distro. But if not:

    apt-get install libasound2 alsa-utils alsa-oss

## Import

    import numpy

    import roboflex.audio_alsa as raa

## Nodes

There is only one: **AudioSensor**

    # all parameters optional: below are the defaults

    audio_sensor = raa.AudioSensor(

        name = "WebcamSensor",

        channels = 1,

        sampling_rate = 48000,

        capture_frames = 512,

        produce_frames = 1024,

        bit_depth = raa.BitDepth.S16LE,

        device_name = "default",

    )

    # must be started (like all sensors)!

    audio_sensor.start()

## Messages

    from roboflex.audio_alsa import AudioData, AudioData32

API:

    # the timestamp just before reading from device

    message.t0 -> Float

    # the timestamp just after reading from device

    message.t1 -> Float

    # the audio data read from the device

    message.data -> np.array

        shape = [C, P] where C is channels, P is produce_frames

        dtype = np.int16

DYNOFLEX:

    # the timestamp just before reading from device

    message["t0"] -> Double

    # the timestamp just after reading from device

    message["t1"] -> Double

    # the audio data read from the device

    message.data -> np.array

        shape = [C, P] where C is channels, P is produce_frames

        dtype = np.int32

## Other

Available BitDepths:

    enum raa.BitDepth:

        S16LE,

        S24LE,

        S32LE,

        S24_3LE