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AudioNodeRecorder.hx
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AudioNodeRecorder.hx
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package tones.utils;
/**
* A Haxe port of the Recorderjs interface - https://github.com/mattdiamond/Recorderjs
* Uses/requires the recorderWorker.js script from Recorderjs
*
* Utility to record the output of an AudioNode and save as WAV
* (encode process runs asynchronously in a worker)
*/
import js.Browser;
import hxsignal.Signal;
import js.html.URL;
import js.html.AnchorElement;
import js.html.audio.AudioContext;
import js.html.audio.AudioNode;
import js.html.audio.ScriptProcessorNode;
import js.html.Blob;
import js.html.Document;
import js.html.DOMURL;
import js.html.Float32Array;
import js.html.MessageEvent;
import js.html.Worker;
class AudioNodeRecorder {
public var recording (default, null):Bool;
public var wavEncoded (default, null):Signal<Blob->Void>;
public var bufferExported (default, null):Signal<Array<Float32Array>->Void>;
var worker :Worker;
var node :ScriptProcessorNode;
public function new(source:AudioNode, bufferSize:Int=4096, workerPath:String='js/recorderWorker.js') {
var context = source.context;
node = context.createScriptProcessor(bufferSize, 2, 2);
worker = new Worker(workerPath);
recording = false;
wavEncoded = new Signal<Blob->Void>();
bufferExported = new Signal<Array<Float32Array>->Void>();
worker.postMessage({
command: 'init',
config: { sampleRate: context.sampleRate }
});
worker.onmessage = onWorkerMessage;
node.onaudioprocess = onAudioProcess;
source.connect(node);
node.connect(context.destination); // this should not be necessary
}
function onWorkerMessage(e:MessageEvent) {
if (Std.is(e.data, Blob)) {
wavEncoded.emit(cast e.data);
} else if (Std.is(e.data, Array)) {
bufferExported.emit(cast e.data);
} else {
throw "Unexpected message data";
}
}
function onAudioProcess(e) {
if (!recording) return;
RecordBufferMessage.buffer[0] = e.inputBuffer.getChannelData(0);
RecordBufferMessage.buffer[1] = e.inputBuffer.getChannelData(1);
worker.postMessage(RecordBufferMessage);
}
inline public function start() recording = true;
inline public function stop() recording = false;
inline public function clear() worker.postMessage( ClearBufferMessage );
inline public function getBuffer() worker.postMessage( GetBufferMessage );
inline public function encodeWAV() worker.postMessage( EncodeWAVMessage );
public static function forceDownload(blob:Blob, filename:String = 'output.wav') {
var doc :Document = js.Browser.window.document;
var link:AnchorElement = cast doc.createElement('a');
link.href = URL.createObjectURL(blob);
link.download = filename;
var click = doc.createEvent("Event");
click.initEvent("click", true, true);
link.dispatchEvent(click);
}
static var RecordBufferMessage :BufferMessage = { command: 'record', buffer:[] };
static var GetBufferMessage :BufferMessage = { command: 'getBuffer' };
static var EncodeWAVMessage :BufferMessage = { command: 'exportWAV', type: 'audio/wav' };
static var ClearBufferMessage :BufferMessage = { command: 'clear' };
}
typedef BufferMessage = {
var command:String;
@:optional var type:String;
@:optional var buffer:Array<Float32Array>;
}