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

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import { iMask } from "../protocol/interface";
import { error } from "./debug";
import { add, len, nextHandle } from "./common";
var BufferObj = /** @class */ (function () {
    function BufferObj(h, s, b, 
    // HEAP pointer to C-callback
    _f, 
    // HEAP pointer to C-userdata
    _u) {
        if (_f === void 0) { _f = 0; }
        if (_u === void 0) { _u = 0; }
        this.h = h;
        this.s = s;
        this.b = b;
        this._f = _f;
        this._u = _u;
    }
    return BufferObj;
}());
export { BufferObj };
export var buffers = [null];
var buffersMaxCount = 128;
export function getNextBufferObj() {
    var next = len(buffers);
    for (var i = 1; i < next; ++i) {
        var buffer = buffers[i];
        if (buffer.s === 0) {
            return buffer.h;
        }
    }
    if (next < buffersMaxCount) {
        var b = new BufferObj(next | 536870912 /* Buffer */, 0, null);
        add(buffers, b);
        return b.h;
    }
    return 0;
}
export function _bufferDestroy(obj) {
    // TODO:
    // if ((obj.s & Flag.Stream) !== 0 && obj.data) {
    //     URL.revokeObjectURL(obj.b as string);
    // }
    obj.h = nextHandle(obj.h);
    obj.s = 0;
    obj.b = null;
}
export function _getBufferObj(buffer) {
    var obj = buffers[buffer & iMask];
    if (obj && obj.h === buffer) {
        return obj;
    }
    return null;
}
function _decodeAudioData(ctx, obj, buffer) {
    var success = function (audioBuffer) {
        obj.s |= 2 /* Loaded */;
        obj.b = audioBuffer;
    };
    var fail = function (err) {
        error(18 /* BufferDecodeError */, err);
        _bufferDestroy(obj);
    };
    // TODO: maybe callbacks will be deprecated?
    ctx.decodeAudioData(buffer, success, fail);
}
export function _bufferMemory(obj, ctx, data, flags) {
    obj.s |= 1 /* Active */;
    var buffer = data.buffer.slice(data.byteOffset, data.byteOffset + data.byteLength);
    // TODO: streaming
    // if (flags & Flag.Stream) {
    //     obj.s |= Flag.Stream;
    _decodeAudioData(ctx, obj, buffer);
}
export function _buffer_set_callback(obj, ctx, f, u) {
    obj.s |= 1 /* Active */ | 2 /* Loaded */ | 16 /* Callback */;
    obj.b = new AudioBuffer({ length: 8192, sampleRate: 44100, numberOfChannels: 2 });
    obj._f = f;
    obj._u = u;
}
export function _bufferLoad(obj, ctx, filepath, flags) {
    obj.s |= 1 /* Active */;
    // TODO: streaming
    //if (flags & Flag.Stream) {
    //obj.s |= Flag.Stream;
    fetch(new Request(filepath))
        .then(function (response) { return response.arrayBuffer(); })
        .then(function (buffer) { return _decodeAudioData(ctx, obj, buffer); })
        .catch(function (reason) {
        error(19 /* BufferLoadError */, reason);
        _bufferDestroy(obj);
    });
}
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