LNXSDK/Kha/Backends/HTML5/kha/js/WebAudioSound.hx

package kha.js;

import haxe.io.Bytes;
import js.Browser;
import js.html.XMLHttpRequest;
import kha.audio2.Audio;

/*
	class WebAudioChannel extends kha.SoundChannel {
	private var buffer: Dynamic;
	private var startTime: Float;
	private var offset: Float;
	private var source: Dynamic;

	public function new(buffer: Dynamic) {
		super();
		this.offset = 0;
		this.buffer = buffer;
		this.startTime = Audio._context.currentTime; 
		this.source = Audio._context.createBufferSource();
		this.source.buffer = this.buffer;
		this.source.connect(Audio._context.destination);
		this.source.start(0);
	}

	override public function play(): Void {
		if (source != null) return;
		super.play();
		startTime = Audio._context.currentTime - offset;
		source.start(0, offset);
	}

	override public function pause(): Void {
		source.stop();
		offset = Audio._context.currentTime - startTime;
		startTime = -1;
		source = null;
	}

	override public function stop(): Void {
		source.stop();
		source = null;
		offset = 0;
		startTime = -1;
		super.stop();
	}

	override public function getCurrentPos(): Int {
		if (startTime < 0) return Math.ceil(offset * 1000);
		else return Math.ceil((Audio._context.currentTime - startTime) * 1000); //Miliseconds
	}

	override public function getLength(): Int {
		return Math.floor(buffer.duration * 1000); //Miliseconds
	}
	}
 */
class WebAudioSound extends kha.Sound {
	public function new(filename: String, done: kha.Sound->Void, failed: AssetError->Void) {
		super();
		var request = untyped new XMLHttpRequest();
		request.open("GET", filename, true);
		request.responseType = "arraybuffer";

		request.onerror = function() {
			failed({url: filename});
		};

		request.onload = function() {
			compressedData = Bytes.ofData(request.response);
			uncompressedData = null;
			done(this);
		};
		request.send(null);
	}

	function superUncompress(done: Void->Void): Void {
		super.uncompress(done);
	}

	override public function uncompress(done: Void->Void): Void {
		Audio._context.decodeAudioData(compressedData.getData(), function(buffer: js.html.audio.AudioBuffer) {
			final ch0 = buffer.getChannelData(0);
			final ch1 = buffer.numberOfChannels == 1 ? ch0 : buffer.getChannelData(1);
			final len = ch0.length;
			uncompressedData = new kha.arrays.Float32Array(len * 2);
			length = buffer.duration;
			channels = buffer.numberOfChannels;
			sampleRate = Math.round(buffer.sampleRate);
			var idx = 0;
			var i = 0;
			final lidx = len * 2;
			function uncompressInner() {
				var chk_len = idx + 11025;
				var next_chk = chk_len > lidx ? lidx : chk_len;
				while (idx < next_chk) {
					uncompressedData[idx] = ch0[i];
					uncompressedData[idx + 1] = ch1[i];
					idx += 2;
					++i;
				}
				if (idx < lidx)
					js.Browser.window.setTimeout(uncompressInner, 0);
				else {
					compressedData = null;
					done();
				}
			};
			uncompressInner();
		}, function() {
			superUncompress(done);
		});
	}
}