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

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import { iMask, Unit } from "../protocol/interface";
import { connectAudioNode, disconnectAudioNode, len, nextHandle, setAudioParamValue } from "./common";
import { emptyAudioBuffer } from "./Mixer";
var VoiceObj = /** @class */ (function () {
    function VoiceObj(g, p, index) {
        var _this = this;
        this.g = g;
        this.p = p;
        // handle passport
        this.h = 0;
        // Control Flags
        this.s = 0;
        // Gain
        this.G = Unit;
        // Pan
        this.P = Unit;
        // Rate
        this.R = Unit;
        // Source auph Buffer
        this.bf = 0;
        // Destination auph Bus
        this.bs = 0;
        // is source-node started: static buffer playback
        this._s = 0;
        // Source-Node
        this.sn = null;
        // Destination-Node: connected destination audio node
        this.dn = null;
        this.pr = null;
        this._e = function () {
            // maybe check is useful
            //if (this.buffer === e.target || (this.stream && this.stream.el === e.target)) {
            _voiceStop(_this);
            //}
        };
        this.h = 805306368 /* Voice */ | index;
    }
    return VoiceObj;
}());
export { VoiceObj };
export function _voiceNew(ctx, index) {
    var gain = ctx.createGain();
    var pan = ctx.createStereoPanner();
    connectAudioNode(pan, gain);
    return new VoiceObj(gain, pan, index);
}
export function _voiceChangeDestination(v, target) {
    if (target !== v.dn) {
        var gain = v.g;
        if (v.dn) {
            disconnectAudioNode(gain, v.dn);
        }
        v.dn = target;
        if (target) {
            connectAudioNode(gain, target);
        }
    }
}
export function _voiceResetDestination(v) {
    if (v.dn) {
        disconnectAudioNode(v.g, v.dn);
        v.dn = null;
    }
}
export function _voiceStop(v) {
    // stop buffer
    var buffer = v.sn;
    if (buffer) {
        if ((v.s & 2 /* Running */) !== 0) {
            buffer.stop();
        }
        buffer.onended = null;
        disconnectAudioNode(buffer);
        try {
            buffer.buffer = emptyAudioBuffer;
        }
        catch (_a) {
        }
        v.sn = null;
    }
    if (v.pr) {
        v.pr.disconnect();
        v.pr.onaudioprocess = null;
        v.pr = null;
    }
    _voiceResetDestination(v);
    v.bf = 0;
    v.bs = 0;
    v.s = 0;
    v.h = nextHandle(v.h);
}
export function _voiceStartBuffer(v) {
    var source = v.sn;
    if (source && !v._s) {
        //source.addEventListener("ended", v._e, {once: true});
        source.onended = v._e;
        source.loop = (v.s & 4 /* Loop */) !== 0;
        source.start();
        v._s = 1;
    }
}
export function _voicePrepareBuffer(v, ctx, audioBuffer) {
    var source = ctx.createBufferSource();
    source.buffer = audioBuffer;
    connectAudioNode(source, v.p);
    v.sn = source;
    v._s = 0;
}
export function _voiceSetLoop(v, value) {
    var current = (v.s & 4 /* Loop */) !== 0;
    if (value !== current) {
        v.s ^= 4 /* Loop */;
        if (v.sn) {
            v.sn.loop = value;
        }
    }
}
export function _voiceSetRunning(v, value) {
    var current = !!(v.s & 2 /* Running */);
    if (value !== current) {
        v.s ^= 2 /* Running */;
        var playbackRate = value ? (v.R / Unit) : 0.0;
        if (v.sn) {
            setAudioParamValue(v.sn.playbackRate, playbackRate);
            if (value) {
                // restart if play called in pause mode
                _voiceStartBuffer(v);
            }
        }
    }
}
export function _voiceApplyPitch(v, value) {
    if (!!(v.s & 2 /* Running */)) {
        if (v.sn) {
            setAudioParamValue(v.sn.playbackRate, value / Unit);
        }
    }
}
export var voicePool = [null];
var voicesMaxCount = 64;
export function _getVoiceObj(handle) {
    var obj = voicePool[handle & iMask];
    return (obj && obj.h === handle) ? obj : null;
}
export function createVoiceObj(ctx) {
    var next = len(voicePool);
    for (var i = 1; i < next; ++i) {
        var v = voicePool[i];
        if (v.s === 0) {
            return v.h;
        }
    }
    if (next < voicesMaxCount) {
        var v = _voiceNew(ctx, next);
        v.h = 805306368 /* Voice */ | next;
        voicePool.push(v);
        return v.h;
    }
    return 0;
}
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