@amazon-devices/keplerscript-audio-lib

import { 
    AudioManager,
    AudioPlaybackStream,
    AudioPlaybackStreamBuilder,
    AudioFocusManager,
    AudioFocusSession
} from '@amazon-devices/keplerscript-audio-lib';

// Set volume for media
await AudioManager.setVolumeAsync(AudioVolumeType.VOLUME_TYPE_MEDIA, 75, AudioVolumeFlags.VOLUME_FLAG_SHOW_UI);

// Get current volume
const volume = await AudioManager.getVolumeAsync(AudioVolumeType.VOLUME_TYPE_MEDIA);

// Create a playback stream
const builder = new AudioPlaybackStreamBuilder();
builder.setAudioConfig({
    sampleRate: AudioSampleRate.SAMPLE_RATE_44_1_KHZ,
    channelMask: AudioChannelMask.CHANNEL_STEREO,
    format: AudioSampleFormat.FORMAT_PCM_16_BIT
});
builder.setAudioAttributes({
    contentType: AudioContentType.CONTENT_TYPE_MUSIC,
    usage: AudioUsageType.USAGE_MEDIA,
    flags: AudioFlags.FLAG_NONE
});

const playbackStream = await builder.buildAsync();
await playbackStream.startAsync();

// Create and request audio focus
const focusSession = await AudioFocusManager.createAudioFocusSessionAsync();
await focusSession.requestAudioFocusAsync({
    usage: AudioUsageType.USAGE_MEDIA
});

// Register for focus changes
await focusSession.registerAudioFocusListenerAsync((focusChange) => {
    console.log('Focus changed:', focusChange);
});

// Register for system-wide audio events
await AudioManager.registerAudioEventObserverAsync((event) => {
    // Event object will contain different properties based on the event type
    switch (event.audioEvent) {
        case AudioEvent.DEVICE_STATE_UPDATE:
            // Triggered when an audio device's connection state changes
            // Parameters:
            // - device: AudioDevice enum value
            // - role: AudioRole enum value
            // - connect: boolean indicating if device was connected (true) or disconnected (false)
            console.log(`Device ${event.device} with role ${event.role} ${event.connect ? 'connected' : 'disconnected'}`);
            break;

        case AudioEvent.VOLUME_UPDATE:
            // Triggered when volume changes for any audio type
            // Parameters:
            // - type: AudioVolumeType enum value
            // - volume: number (0-100)
            console.log('Volume changed for:', event.type, 'to:', event.volume);
            break;

        case AudioEvent.GLOBAL_VOLUME_MUTE_UPDATE:
            // Triggered when global mute state changes
            // Parameters:
            // - mute: boolean indicating if system is muted
            console.log('Global mute updated to state: ', event.mute);
            break;

        case AudioEvent.SERVER_DOWN:
            // Triggered when audio server becomes unavailable
            console.log('Audio server is down');
            break;

        case AudioEvent.SERVER_UP:
            // Triggered when audio server becomes available
            console.log('Audio server is up');
            break;

        case AudioEvent.AUDIO_USAGE_STATE_CHANGE:
            // Triggered when audio usage state changes
            // Parameters:
            // - usage: AudioUsageType enum value
            // - active: boolean indicating if usage became active
            console.log('Usage: ', event.usage);
            console.log('Active status: ', event.active);
            break;

        case AudioEvent.MIC_MUTE_STATE_UPDATE:
            // Triggered when microphone mute state changes
            // Parameters:
            // - state: boolean indicating if mic is muted
            console.log('Mic mute state changed: ', event.muteState);
            break;

        case AudioEvent.VOLUME_MUTE_UPDATE:
            // Triggered when volume mute state changes for specific volume type
            // Parameters:
            // - volumeType: AudioVolumeType enum value
            // - mute: boolean indicating if type is muted
            console.log('Volume type: ', event.volumeType);
            console.log('Mute state: ', event.muteState);
            break;

        case AudioEvent.TELEPHONY_MUTE_UPDATE:
            // Triggered when telephony mute state changes
            // Parameters:
            // - deviceType: AudioDevice enum value
            // - address: string representing device address
            // - deviceName: string representing device name
            // - mute: boolean indicating if telephony is muted
            console.log('Telephony mute update!: ');
            console.log('Device type: ', event.deviceType);
            console.log('Device address: ', event.deviceAddress);
            console.log('Device name: ', event.deviceName);
            console.log('Device mute state: ', event.muteState);
            break;
    }
});

// Cleanup
await AudioManager.unregisterAudioEventObserverAsync();

const playbackStream = await builder.buildAsync();

await playbackStream.registerEventObserverAsync((event) => {
    switch (event.type) {
        case AudioPlaybackEvent.DIED:
            // Triggered when the playback stream becomes unavailable
            break;

        case AudioPlaybackEvent.RECOVERED:
            // Triggered when the playback stream recovers from a died state
            break;

        case AudioPlaybackEvent.STOPPED:
            // Triggered when the playback stream stops
            break;

        case AudioPlaybackEvent.MUTE_STATE_UPDATE:
            // Triggered when the stream's mute state changes
            // Parameters:
            // - muted: boolean indicating if stream is muted
            console.log('MuteState: ', event.muteState);
            break;

        case AudioPlaybackEvent.FRAME_UNDERRUN:
            // Triggered when a buffer underrun occurs
            // Parameters:
            // - size: number indicating the underrun size in frames
            console.log('Underrun count: ', event.underrunCount);
            break;
    }
});

// Cleanup
await playbackStream.unregisterEventObserverAsync();

const focusSession = await AudioFocusManager.createAudioFocusSessionAsync();

await focusSession.registerAudioFocusListenerAsync((focusChange) => {
    switch (focusChange.type) {
        case AudioFocusChange.GRANTED:
            // Triggered when audio focus is granted
            break;

        case AudioFocusChange.RELEASED:
            // Triggered when audio focus is released
            break;

        case AudioFocusChange.DUCKED:
            // Triggered when audio should be ducked (reduced in volume)
            break;

        case AudioFocusChange.PAUSED:
            // Triggered when audio should be paused
            break;

        case AudioFocusChange.STOPPED:
            // Triggered when audio should be stopped
            break;
    }
});

// Cleanup
await focusSession.unregisterAudioFocusListenerAsync();