Multimedia

Audio

Looking at the Audio Recorder example we see that by creating a QMediaRecorder object that is initialized with a newly created QAudioCaptureSource object we can now perform all the core actions necessary to record a sound source.

To initialize the objects we create a QAudioCaptureSource object. This will have a list of available devices to choose from so that we can identify the origin of the audio data. We then use the capture source object to initialize a QMediaRecorder object

        audiosource = new QAudioCaptureSource;
        capture = new QMediaRecorder(audiosource);

The API now allows us to discover available devices and codecs as shown in the example. To actually do the recording we merely have to call the record() function, and to stop call the stop() function. Saving to a file is done simply by calling QMediaRecorder::setOutputLocation() before starting to record.

With a handful of functions and two classes we can implement a sound recording application, excluding the supporting user interface code.

        player = new QMediaPlayer;
        playlist = new QMediaPlaylist(player);