103 lines
3.1 KiB
TypeScript
103 lines
3.1 KiB
TypeScript
namespace audio.player {
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let _globalContext: AudioContext;
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let _global_destination: GainNode;
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let _globalContextPromise: Promise<void>;
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let _initialized_listener: (() => any)[] = [];
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let _master_volume: number = 1;
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let _no_device = false;
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export function initialize() : boolean {
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context();
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return true;
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}
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export function initialized() : boolean {
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return !!_globalContext && _globalContext.state === 'running';
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}
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function fire_initialized() {
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log.info(LogCategory.AUDIO, tr("File initialized for %d listeners"), _initialized_listener.length);
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while(_initialized_listener.length > 0)
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_initialized_listener.pop_front()();
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}
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export function context() : AudioContext {
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if(_globalContext && _globalContext.state != "suspended") return _globalContext;
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if(!_globalContext)
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_globalContext = new (window.webkitAudioContext || window.AudioContext)();
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_initialized_listener.unshift(() => {
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_global_destination = _globalContext.createGain();
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_global_destination.gain.value = _no_device ? 0 : _master_volume;
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_global_destination.connect(_globalContext.destination);
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});
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if(_globalContext.state == "suspended") {
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if(!_globalContextPromise) {
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(_globalContextPromise = _globalContext.resume()).then(() => {
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fire_initialized();
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}).catch(error => {
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loader.critical_error("Failed to initialize global audio context! (" + error + ")");
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});
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}
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_globalContext.resume(); //We already have our listener
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return _globalContext;
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}
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if(_globalContext.state == "running") {
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fire_initialized();
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return _globalContext;
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}
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return _globalContext;
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}
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export function get_master_volume() : number {
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return _master_volume;
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}
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export function set_master_volume(volume: number) {
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_master_volume = volume;
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if(_global_destination)
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_global_destination.gain.value = _no_device ? 0 : _master_volume;
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}
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export function destination() : AudioNode {
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const ctx = context();
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if(!ctx) throw tr("Audio player isn't initialized yet!");
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return _global_destination;
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}
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export function on_ready(cb: () => any) {
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if(initialized())
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cb();
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else
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_initialized_listener.push(cb);
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}
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export const WEB_DEVICE: Device = {
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device_id: "default",
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name: "default playback",
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driver: 'Web Audio'
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};
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export function available_devices() : Promise<Device[]> {
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return Promise.resolve([WEB_DEVICE])
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}
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export function set_device(device_id: string) : Promise<void> {
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_no_device = !device_id;
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_global_destination.gain.value = _no_device ? 0 : _master_volume;
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return Promise.resolve();
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}
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export function current_device() : Device {
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return WEB_DEVICE;
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}
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export function initializeFromGesture() {
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context();
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}
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}
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