Description:

carp audio package

CARP Media Sampling Package #





This library contains a sampling package for media (audio, video, image, noise) sampling to work with the carp_mobile_sensing package.
This packages supports sampling of the following Measure types:

dk.cachet.carp.noise
dk.cachet.carp.audio
dk.cachet.carp.video
dk.cachet.carp.image

The name of the Flutter pub.dev package is "audio" for historical reasons - however, it is (now) a "media" package and the CAMS package name is MediaSamplingPackage.
See the wiki for further documentation, particularly on available measure types.
See the CARP Mobile Sensing App for an example of how to build a mobile sensing app in Flutter.
For Flutter plugins for other CARP products, see CARP Mobile Sensing in Flutter.
If you're interested in writing you own sampling packages for CARP, see the description on
how to extend CARP on the wiki.
Installing #
To use this package, add the following to you pubspc.yaml file. Note that
this package only works together with carp_mobile_sensing.
dependencies:
flutter:
sdk: flutter
carp_core: ^latest
carp_mobile_sensing: ^latest
carp_audio_package: ^latest
...
copied to clipboard
Android Integration #
Add the following to your app's AndroidManifest.xml file located in android/app/src/main:
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
copied to clipboard
iOS Integration #
Add this permission in the Info.plist file located in ios/Runner:
<key>NSMicrophoneUsageDescription</key>
<string>Uses the microphone to record ambient noise in the phone's environment.</string>
<key>NSCameraUsageDescription</key>
<string>Uses the camera to ....</string>
<key>UIBackgroundModes</key>
<array>
<string>audio</string>
<string>external-accessory</string>
<string>fetch</string>
</array>
copied to clipboard
Using it #
To use this package, import it into your app together with the
carp_mobile_sensing package:
import 'package:carp_core/carp_core.dart';
import 'package:carp_mobile_sensing/carp_mobile_sensing.dart';
import 'package:carp_audio_package/media.dart';
copied to clipboard
Before creating a study and running it, register this package in the
SamplingPackageRegistry.
SamplingPackageRegistry().register(MediaSamplingPackage());
copied to clipboard
The noise measure is event-based, whereas the audio, video, and image measures are one-time measures. Using the measures from this package in a study protocol would look something like the following examples.
// Create a study protocol
StudyProtocol protocol = StudyProtocol(
ownerId: 'owner@dtu.dk',
name: 'Audio Sensing Example',
);

// Define which devices are used for data collection
// In this case, its only this smartphone
Smartphone phone = Smartphone();
protocol.addPrimaryDevice(phone);

// Add an task that immediately starts collecting noise.
protocol.addTaskControl(
ImmediateTrigger(),
BackgroundTask(measures: [
Measure(type: MediaSamplingPackage.NOISE),
]),
phone);
copied to clipboard
The default sampling configuration of noise is to sample every 5 minutes for 10 seconds.
This configuration can, however, be overridden like this:
// Collect noise, but change the default sampling configuration
protocol.addTaskControl(
ImmediateTrigger(),
BackgroundTask(measures: [
Measure(type: MediaSamplingPackage.NOISE)
..overrideSamplingConfiguration = PeriodicSamplingConfiguration(
interval: const Duration(seconds: 30),
duration: const Duration(seconds: 5),
),
]),
phone);
copied to clipboard
And audio measure is a one-time measure and must be started and stopped explicitly.
The following example show how this can be done:
// Sample an audio recording
var audioTask = BackgroundTask(measures: [
Measure(type: MediaSamplingPackage.AUDIO),
]);

// Start the audio task after 20 secs and stop it after 40 secs
protocol
..addTaskControl(
DelayedTrigger(delay: const Duration(seconds: 20)),
audioTask,
phone,
Control.Start,
)
..addTaskControl(
DelayedTrigger(delay: const Duration(seconds: 40)),
audioTask,
phone,
Control.Stop,
);
copied to clipboard
Note that the image and video measures are not used in background sensing and hence do not have a probe associated. These measures are only used in a AppTask, i.e., a task done by the user.

License

For personal and professional use. You cannot resell or redistribute these repositories in their original state.

Share

• Share on Facebook
• Share on Twitter