@ux-aspects/ux-aspects
Version:
Open source user interface framework for building modern, responsive, mobile big data applications
127 lines • 20.2 kB
JavaScript
import { HttpClient } from '@angular/common/http';
import { inject, Injectable } from '@angular/core';
import { Observable, of } from 'rxjs';
import * as i0 from "@angular/core";
export class AudioService {
constructor() {
this._http = inject(HttpClient);
}
getAudioFileMetadata(mediaElement) {
return Observable.create((observer) => {
this._http.get(mediaElement.src, { responseType: 'blob' }).subscribe(response => {
let description;
const extension = mediaElement.src.substring(mediaElement.src.lastIndexOf('.') + 1).toLowerCase();
const filename = mediaElement.src.indexOf('base64') !== -1 ? '' : mediaElement.src.substring(mediaElement.src.lastIndexOf('/') + 1);
switch (extension) {
case 'mp3':
description = 'MPEG audio layer 3 file';
break;
case 'wma':
description = 'Windows media audio file';
break;
case 'wav':
description = 'WAVE audio file';
break;
case 'ogg':
description = 'Ogg Vorbis file';
break;
case 'aac':
description = 'Advanced audio coding file';
break;
case 'midi':
description = 'Musical instrument digital interface file';
break;
default:
description = 'Audio file';
break;
}
observer.next({
filename,
extension,
description,
size: response.size
});
});
});
}
getWaveformFromUrl(url) {
// if audio context is not support return a stream of empty data
if (!window.AudioContext) {
return of([new Float32Array(0)]);
}
this._audioContext = new AudioContext();
this.createVolumeNode();
this.createAnalyserNode();
return Observable.create((observer) => {
// load the media from the URL provided
this._http.get(url, { responseType: 'arraybuffer' }).subscribe(response => {
this.getAudioBuffer(response).subscribe(audioBuffer => {
// create the buffer source
this.createBufferSource(audioBuffer);
let dataPoints = [];
const channels = this._audioBuffer.numberOfChannels;
// extract the data from each channel
for (let channelIdx = 0; channelIdx < channels; channelIdx++) {
dataPoints[channelIdx] = this._audioBuffer.getChannelData(channelIdx);
}
observer.next(dataPoints);
observer.complete();
// cleanup after ourselves
dataPoints = null;
}, (error) => observer.error(error));
}, (error) => observer.error(error));
});
}
getWaveformPoints(channels = [], skip = 1000) {
const waveform = [];
const duration = channels.length > 0 ? channels[0].length : 0;
// convert each channel data to a series of waveform points
for (let idx = 0; idx < duration; idx += skip) {
// get all the channel data for a specific point
const points = channels.map(channel => channel[idx]);
// find the minimum point and maximum points at each position across all channels
waveform.push({
min: points.reduce((previous, current) => current < previous ? current : previous),
max: points.reduce((previous, current) => current > previous ? current : previous)
});
}
return waveform;
}
getAudioBuffer(arrayBuffer) {
return Observable.create((observer) => {
this.getOfflineAudioContext().decodeAudioData(arrayBuffer, (audioBuffer) => {
observer.next(audioBuffer);
observer.complete();
}, (error) => observer.error(error));
});
}
getOfflineAudioContext() {
return new OfflineAudioContext(1, 2, this._audioContext.sampleRate || 44100);
}
createBufferSource(audioBuffer) {
this.disconnectSource();
this._audioBuffer = audioBuffer;
this._audioBufferSource = this._audioContext.createBufferSource();
this._audioBufferSource.buffer = this._audioBuffer;
this._audioBufferSource.connect(this._analyserNode);
}
createVolumeNode() {
this._gainNode = this._audioContext.createGain();
this._gainNode.connect(this._audioContext.destination);
}
createAnalyserNode() {
this._analyserNode = this._audioContext.createAnalyser();
this._analyserNode.connect(this._gainNode);
}
disconnectSource() {
if (this._audioBufferSource) {
this._audioBufferSource.disconnect();
}
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: AudioService, deps: [], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: AudioService }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: AudioService, decorators: [{
type: Injectable
}] });
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{ HttpClient } from '@angular/common/http';\nimport { inject, Injectable } from '@angular/core';\nimport { Observable, Observer, of } from 'rxjs';\n\n@Injectable()\nexport class AudioService {\n    private readonly _http = inject(HttpClient);\n\n    private _audioBuffer: AudioBuffer;\n    private _audioBufferSource: AudioBufferSourceNode;\n    private _audioContext: AudioContext;\n    private _gainNode: GainNode;\n    private _analyserNode: AnalyserNode;\n\n    getAudioFileMetadata(mediaElement: HTMLMediaElement): Observable<AudioMetadata> {\n        return Observable.create((observer: Observer<AudioMetadata>) => {\n            this._http.get(mediaElement.src, { responseType: 'blob' }).subscribe(response => {\n\n                let description;\n                const extension = mediaElement.src.substring(mediaElement.src.lastIndexOf('.') + 1).toLowerCase();\n                const filename = mediaElement.src.indexOf('base64') !== -1 ? '' : mediaElement.src.substring(mediaElement.src.lastIndexOf('/') + 1);\n\n                switch (extension) {\n                    case 'mp3':\n                        description = 'MPEG audio layer 3 file';\n                        break;\n\n                    case 'wma':\n                        description = 'Windows media audio file';\n                        break;\n\n                    case 'wav':\n                        description = 'WAVE audio file';\n                        break;\n\n                    case 'ogg':\n                        description = 'Ogg Vorbis file';\n                        break;\n\n                    case 'aac':\n                        description = 'Advanced audio coding file';\n                        break;\n\n                    case 'midi':\n                        description = 'Musical instrument digital interface file';\n                        break;\n\n                    default:\n                        description = 'Audio file';\n                        break;\n                }\n\n                observer.next({\n                    filename,\n                    extension,\n                    description,\n                    size: response.size\n                });\n            });\n        });\n    }\n\n    getWaveformFromUrl(url: string): Observable<Float32Array[]> {\n\n        // if audio context is not support return a stream of empty data\n        if (!window.AudioContext) {\n            return of<Float32Array[]>([new Float32Array(0)]);\n        }\n\n        this._audioContext = new AudioContext();\n        this.createVolumeNode();\n        this.createAnalyserNode();\n\n        return Observable.create((observer: Observer<Float32Array[]>) => {\n\n            // load the media from the URL provided\n            this._http.get(url, { responseType: 'arraybuffer' }).subscribe(response => {\n                this.getAudioBuffer(response).subscribe(audioBuffer => {\n\n                    // create the buffer source\n                    this.createBufferSource(audioBuffer);\n\n                    let dataPoints: Float32Array[] = [];\n                    const channels = this._audioBuffer.numberOfChannels;\n\n                    // extract the data from each channel\n                    for (let channelIdx = 0; channelIdx < channels; channelIdx++) {\n                        dataPoints[channelIdx] = this._audioBuffer.getChannelData(channelIdx);\n                    }\n\n                    observer.next(dataPoints);\n                    observer.complete();\n\n                    // cleanup after ourselves\n                    dataPoints = null;\n                }, (error) => observer.error(error));\n            }, (error) => observer.error(error));\n        });\n    }\n\n    getWaveformPoints(channels: Float32Array[] = [], skip: number = 1000): WaveformPoint[] {\n\n        const waveform: WaveformPoint[] = [];\n        const duration = channels.length > 0 ? channels[0].length : 0;\n\n        // convert each channel data to a series of waveform points\n        for (let idx = 0; idx < duration; idx += skip) {\n\n            // get all the channel data for a specific point\n            const points = channels.map(channel => channel[idx]);\n\n            // find the minimum point and maximum points at each position across all channels\n            waveform.push({\n                min: points.reduce((previous, current) => current < previous ? current : previous),\n                max: points.reduce((previous, current) => current > previous ? current : previous)\n            });\n        }\n\n        return waveform;\n    }\n\n    private getAudioBuffer(arrayBuffer: ArrayBuffer): Observable<AudioBuffer> {\n        return Observable.create((observer: Observer<AudioBuffer>) => {\n            this.getOfflineAudioContext().decodeAudioData(arrayBuffer, (audioBuffer: AudioBuffer) => {\n                observer.next(audioBuffer);\n                observer.complete();\n            }, (error) => observer.error(error));\n        });\n    }\n\n    private getOfflineAudioContext(): OfflineAudioContext {\n        return new OfflineAudioContext(1, 2, this._audioContext.sampleRate || 44100);\n    }\n\n    private createBufferSource(audioBuffer: AudioBuffer): void {\n        this.disconnectSource();\n\n        this._audioBuffer = audioBuffer;\n        this._audioBufferSource = this._audioContext.createBufferSource();\n        this._audioBufferSource.buffer = this._audioBuffer;\n        this._audioBufferSource.connect(this._analyserNode);\n    }\n\n    private createVolumeNode(): void {\n        this._gainNode = this._audioContext.createGain();\n        this._gainNode.connect(this._audioContext.destination);\n    }\n\n    private createAnalyserNode(): void {\n        this._analyserNode = this._audioContext.createAnalyser();\n        this._analyserNode.connect(this._gainNode);\n    }\n\n    private disconnectSource(): void {\n        if (this._audioBufferSource) {\n            this._audioBufferSource.disconnect();\n        }\n    }\n}\n\nexport interface WaveformPoint {\n    min: number;\n    max: number;\n}\n\nexport interface AudioMetadata {\n    filename: string;\n    extension: string;\n    description: string;\n    size: number;\n}\n"]}