@ekx/auph/web/dist/module/webaudio/Mixer.js

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import { error, log, warn } from "./debug";
import { unlock } from "./Unlock";
var ctx;
export var emptyAudioBuffer;
var defaultSampleRate = 22050;
export function getContext() {
    if (ctx && ctx.state !== "closed") {
        return ctx;
    }
    warn(2 /* InvalidState */);
}
export function getAudioContextObject() {
    return ctx;
}
export function getContextState(ctx) {
    var state = 0;
    if (ctx.state !== "closed") {
        state |= 1 /* Active */;
        if (ctx.state === "running") {
            state |= 2 /* Running */;
        }
    }
    return state;
}
export function audioContextResume(ctx) {
    log(3 /* DeviceResuming */);
    ctx.resume().then(function () {
        log(4 /* DeviceResumed */);
    }).catch(function (reason) {
        error(5 /* DeviceResumeError */, reason);
    });
}
export function audioContextPause(ctx) {
    log(6 /* DevicePausing */);
    ctx.suspend().then(function () {
        log(7 /* DevicePaused */);
    }).catch(function (reason) {
        error(8 /* DevicePauseError */, reason);
    });
}
function newAudioContext(options) {
    var scope = window;
    var audioContext = scope.AudioContext || scope.webkitAudioContext;
    // TODO: set sample rate could lead to wrong playback on safari mobile (maybe it should be recreated after unlock?)
    //try {
    //    return new audioContext(options);
    //} catch (err) {
    //    error(Message.WebAudio_TryDefaultOptions, err);
    //}
    try {
        return new audioContext();
    }
    catch (err) {
        error(1 /* NotSupported */, err);
    }
}
export function initContext() {
    if (ctx) {
        warn(14 /* Warning_AlreadyInitialized */);
        return ctx;
    }
    ctx = newAudioContext({
        latencyHint: "interactive",
        sampleRate: defaultSampleRate
    });
    if (ctx) {
        emptyAudioBuffer = ctx.createBuffer(1, 1, defaultSampleRate);
        unlock(function () {
            if (ctx.state === "suspended") {
                audioContextResume(ctx);
                return false;
            }
            return true;
        });
    }
    return ctx;
}
export function closeContext(context) {
    log(9 /* DeviceClosing */);
    context.close().then(function () {
        log(10 /* DeviceClosed */);
    }).catch(function (reason) {
        error(11 /* DeviceCloseError */, reason);
    });
    ctx = undefined;
}
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