赞
踩
1、OpenHarmony音频录制开发简介
音频录制的主要工作是捕获音频信号,完成音频编码并保存到文件中,帮助开发者轻松实现音频录制功能。该模块允许调用者指定音频录制的采样率、声道数、编码格式、封装格式、输出文件的路径等参数。
2、OpenHarmony运作机制
音频录制状态示意图如图1.1所示:
3、音频录制外部模块交互图
图1.2 音频录制外部模块交互图
说明:三方录音应用或录音机通过调用JS接口层提供的js接口实现相应功能时,框架层会通过Native Framework的媒体服务,调用音频部件获取通过音频HDI捕获的音频数据,再通过软件编码输出编码封装后的音频数据保存至文件中,实现音频录制功能。
开发者在进行录制功能开发前,需要先对所开发的应用配置麦克风权限(ohos.permission.MICROPHONE),权限配置相关内容可参考:访问控制权限申请指导
详细API含义可参考:媒体服务API文档AudioRecorder
(1).全录制流程场景
音频录制的全流程场景包含:创建实例,设置录制参数,开始录制,暂停录制,恢复录制,停止录制,释放资源等流程。
- import media from '@ohos.multimedia.media'
- import mediaLibrary from '@ohos.multimedia.mediaLibrary'
- export class AudioRecorderDemo {
- private testFdNumber; // 用于保存fd地址
-
- // 设置音频录制相关回调函数
- setCallBack(audioRecorder) {
- audioRecorder.on('prepare', () => { // 设置'prepare'事件回调
- console.log('prepare success');
- audioRecorder.start(); // 调用start方法开始录制,并触发start回调
- });
- audioRecorder.on('start', () => { // 设置'start'事件回调
- console.log('audio recorder start success');
- audioRecorder.pause(); // 调用pause方法暂停录制,并触发pause回调
- });
- audioRecorder.on('pause', () => { // 设置'pause'事件回调
- console.log('audio recorder pause success');
- audioRecorder.resume(); // 调用resume方法恢复录制,并触发resume回调
- });
- audioRecorder.on('resume', () => { // 设置'resume'事件回调
- console.log('audio recorder resume success');
- audioRecorder.stop(); // 调用stop方法停止录制,并触发stop回调
- });
- audioRecorder.on('stop', () => { // 设置'stop'事件回调
- console.log('audio recorder stop success');
- audioRecorder.reset(); // 调用reset方法重置录制,并触发reset回调
- });
- audioRecorder.on('reset', () => { // 设置'reset'事件回调
- console.log('audio recorder reset success');
- audioRecorder.release(); // 调用release方法,释放资源,并触发release回调
- });
- audioRecorder.on('release', () => { // 设置'release'事件回调
- console.log('audio recorder release success');
- audioRecorder = undefined;
- });
- audioRecorder.on('error', (error) => { // 设置'error'事件回调
- console.info(`audio error called, errName is ${error.name}`);
- console.info(`audio error called, errCode is ${error.code}`);
- console.info(`audio error called, errMessage is ${error.message}`);
- });
- }
-
- // pathName是传入的录制文件名,例如:01.mp3,生成后的文件地址:/storage/media/100/local/files/Video/01.mp3
- // 使用mediaLibrary需要添加以下权限, ohos.permission.MEDIA_LOCATION、ohos.permission.WRITE_MEDIA、ohos.permission.READ_MEDIA
- async getFd(pathName) {
- let displayName = pathName;
- const mediaTest = mediaLibrary.getMediaLibrary();
- let fileKeyObj = mediaLibrary.FileKey;
- let mediaType = mediaLibrary.MediaType.VIDEO;
- let publicPath = await mediaTest.getPublicDirectory(mediaLibrary.DirectoryType.DIR_VIDEO);
- let dataUri = await mediaTest.createAsset(mediaType, displayName, publicPath);
- if (dataUri != undefined) {
- let args = dataUri.id.toString();
- let fetchOp = {
- selections : fileKeyObj.ID + "=?",
- selectionArgs : [args],
- }
- let fetchFileResult = await mediaTest.getFileAssets(fetchOp);
- let fileAsset = await fetchFileResult.getAllObject();
- let fdNumber = await fileAsset[0].open('Rw');
- this.testFdNumber = "fd://" + fdNumber.toString();
- }
- }
-
- async audioRecorderDemo() {
- // 1.创建实例
- let audioRecorder = media.createAudioRecorder();
- // 2.设置回调
- this.setCallBack(audioRecorder);
- await this.getFd('01.mp3'); // 调用getFd方法获取需要录制文件的fd地址
- // 3.设置录制参数
- let audioRecorderConfig = {
- audioEncodeBitRate : 22050,
- audioSampleRate : 22050,
- numberOfChannels : 2,
- uri : this.testFdNumber, // testFdNumber由getFd生成
- location : { latitude : 30, longitude : 130},
- audioEncoderMime : media.CodecMimeType.AUDIO_AAC,
- fileFormat : media.ContainerFormatType.CFT_MPEG_4A,
- }
- audioRecorder.prepare(audioRecorderConfig); // 调用prepare方法,触发prepare回调函数
- }
- }
(2).正常录制场景
与全流程场景不同,不包括暂停录制,恢复录制的过程。
- import media from '@ohos.multimedia.media'
- import mediaLibrary from '@ohos.multimedia.mediaLibrary'
- export class AudioRecorderDemo {
- private testFdNumber; // 用于保存fd地址
-
- // 设置音频录制相关回调函数
- setCallBack(audioRecorder) {
- audioRecorder.on('prepare', () => { // 设置'prepare'事件回调
- console.log('prepare success');
- audioRecorder.start(); // 调用start方法开始录制,并触发start回调
- });
- audioRecorder.on('start', () => { // 设置'start'事件回调
- console.log('audio recorder start success');
- audioRecorder.stop(); // 调用stop方法停止录制,并触发stop回调
- });
- audioRecorder.on('stop', () => { // 设置'stop'事件回调
- console.log('audio recorder stop success');
- audioRecorder.release(); // 调用release方法,释放资源,并触发release回调
- });
- audioRecorder.on('release', () => { // 设置'release'事件回调
- console.log('audio recorder release success');
- audioRecorder = undefined;
- });
- audioRecorder.on('error', (error) => { // 设置'error'事件回调
- console.info(`audio error called, errName is ${error.name}`);
- console.info(`audio error called, errCode is ${error.code}`);
- console.info(`audio error called, errMessage is ${error.message}`);
- });
- }
-
- // pathName是传入的录制文件名,例如:01.mp3,生成后的文件地址:/storage/media/100/local/files/Video/01.mp3
- // 使用mediaLibrary需要添加以下权限, ohos.permission.MEDIA_LOCATION、ohos.permission.WRITE_MEDIA、ohos.permission.READ_MEDIA
- async getFd(pathName) {
- let displayName = pathName;
- const mediaTest = mediaLibrary.getMediaLibrary();
- let fileKeyObj = mediaLibrary.FileKey;
- let mediaType = mediaLibrary.MediaType.VIDEO;
- let publicPath = await mediaTest.getPublicDirectory(mediaLibrary.DirectoryType.DIR_VIDEO);
- let dataUri = await mediaTest.createAsset(mediaType, displayName, publicPath);
- if (dataUri != undefined) {
- let args = dataUri.id.toString();
- let fetchOp = {
- selections : fileKeyObj.ID + "=?",
- selectionArgs : [args],
- }
- let fetchFileResult = await mediaTest.getFileAssets(fetchOp);
- let fileAsset = await fetchFileResult.getAllObject();
- let fdNumber = await fileAsset[0].open('Rw');
- this.testFdNumber = "fd://" + fdNumber.toString();
- }
- }
-
- async audioRecorderDemo() {
- // 1.创建实例
- let audioRecorder = media.createAudioRecorder();
- // 2.设置回调
- this.setCallBack(audioRecorder);
- await this.getFd('01.mp3'); // 调用getFd方法获取需要录制文件的fd地址
- // 3.设置录制参数
- let audioRecorderConfig = {
- audioEncodeBitRate : 22050,
- audioSampleRate : 22050,
- numberOfChannels : 2,
- uri : this.testFdNumber, // testFdNumber由getFd生成
- location : { latitude : 30, longitude : 130},
- audioEncoderMime : media.CodecMimeType.AUDIO_AAC,
- fileFormat : media.ContainerFormatType.CFT_MPEG_4A,
- }
- audioRecorder.prepare(audioRecorderConfig); // 调用prepare方法,触发prepare回调函数
- }
- }
针对音频录制开发,有以下相关实例可供参考:
Copyright © 2003-2013 www.wpsshop.cn 版权所有,并保留所有权利。