# 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
Raw data
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"description": "# roboflex.audio_alsa\n\nSupport for reading audio data on linux from the Advanced Linux Sound Architecture (ALSA).\n\n## System dependencies\n\nRequires ALSA to be installed. More than likely, it already is installed in your distro. But if not:\n\n apt-get install libasound2 alsa-utils alsa-oss\n\n## Import\n\n import numpy\n import roboflex.audio_alsa as raa\n\n## Nodes\n\nThere is only one: **AudioSensor**\n\n # all parameters optional: below are the defaults\n audio_sensor = raa.AudioSensor(\n name = \"WebcamSensor\",\n channels = 1,\n sampling_rate = 48000,\n capture_frames = 512,\n produce_frames = 1024,\n bit_depth = raa.BitDepth.S16LE,\n device_name = \"default\",\n )\n\n # must be started (like all sensors)!\n audio_sensor.start()\n\n## Messages\n\n from roboflex.audio_alsa import AudioData, AudioData32\n\nAPI:\n\n # the timestamp just before reading from device\n message.t0 -> Float\n\n # the timestamp just after reading from device\n message.t1 -> Float\n\n # the audio data read from the device\n message.data -> np.array\n shape = [C, P] where C is channels, P is produce_frames\n dtype = np.int16\n\nDYNOFLEX:\n\n # the timestamp just before reading from device\n message[\"t0\"] -> Double\n\n # the timestamp just after reading from device\n message[\"t1\"] -> Double\n\n # the audio data read from the device\n message.data -> np.array\n shape = [C, P] where C is channels, P is produce_frames\n dtype = np.int32\n\n## Other\n\nAvailable BitDepths:\n\n enum raa.BitDepth:\n S16LE,\n S24LE,\n S32LE,\n S24_3LE\n\n",
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