dev@445: /**
dev@445:  * Created by lucast on 26/06/2017.
dev@445:  */
dev@445: import {
dev@445:   BlobEvent as IBlobEvent,
dev@445:   MediaRecorder,
dev@445:   MediaRecorderErrorEvent,
dev@445:   RecordingState
dev@445: } from './audio-recorder.service';
dev@445: import * as RecordRtc from 'recordrtc';
dev@445: 
dev@445: // safari doesn't implement BlobEvent... this should do
dev@445: class BlobEvent extends Event implements IBlobEvent {
dev@445:   data: Blob;
dev@445: 
dev@445:   constructor(data: Blob) {
dev@445:     super('blob');
dev@445:     this.data = data;
dev@445:   }
dev@445: }
dev@445: 
dev@445: export class RecordRtcMediaRecorder implements MediaRecorder {
dev@445:   mimeType: string;
dev@445:   state: RecordingState;
dev@445:   stream: MediaStream;
dev@445:   ignoreMutedMedia: boolean;
dev@445:   videoBitsPerSecond: number;
dev@445:   audioBitsPerSecond: number;
dev@445:   onstart: (evt: Event) => void;
dev@445:   onstop: (evt: Event) => void;
dev@445:   ondataavailable: (evt: BlobEvent) => void;
dev@445:   onpause: (evt: Event) => void;
dev@445:   onresume: (evt: Event) => void;
dev@445:   onerror: (evt: MediaRecorderErrorEvent) => void;
dev@445: 
dev@445:   private recorder: any; // TODO RecordRTC typings?
dev@445: 
dev@445:   static isTypeSupported(mimeType: string): boolean {
dev@445:     return mimeType === 'audio/wav';
dev@445:   }
dev@445: 
dev@445:   constructor(stream: MediaStream) {
dev@445:     this.state = 'inactive';
dev@445:     this.stream = stream;
dev@445:     this.recorder = RecordRtc(stream, {
dev@445:       type: 'audio',
dev@445:       recorderType: RecordRtc.StereoAudioRecorder
dev@445:     });
dev@445:   }
dev@445: 
dev@445: 
dev@445:   pause(): void {
dev@445:     this.state = 'paused';
dev@445:     this.recorder.pauseRecording();
dev@445:   }
dev@445: 
dev@445:   requestData(): void {
dev@445:     // could probably implement this, but it isn't actually used in the app
dev@445:     throw new Error('Not implemented');
dev@445:   }
dev@445: 
dev@445:   resume(): void {
dev@445:     this.state = 'recording';
dev@445:     this.recorder.resumeRecording();
dev@445:   }
dev@445: 
dev@445:   start(timeslice?: number): void {
dev@445:     this.state = 'recording';
dev@445:     this.recorder.startRecording();
dev@445:   }
dev@445: 
dev@445:   stop(): void {
dev@445:     this.state = 'inactive';
dev@445:     this.recorder.stopRecording(() => {
dev@445:       if (this.ondataavailable) {
dev@445:         const blob = this.recorder.getBlob();
dev@445:         this.mimeType = blob.type;
dev@445:         this.ondataavailable(new BlobEvent(blob));
dev@445:       }
dev@445:       if (this.onstop) {
dev@445:         this.onstop(new Event('stop'));
dev@445:       }
dev@445:     });
dev@445:   }
dev@445: }