# 音频录制开发指导 ## 场景介绍 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。它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、文件路径等参数。 **图1** 音频录制状态机 ![zh-ch_image_audio_recorder_state_machine](figures/zh-ch_image_audio_recorder_state_machine.png) **图2** 音频录制零层图 ![zh-ch_image_audio_recorder_zero](figures/zh-ch_image_audio_recorder_zero.png) ## 开发步骤 详细API含义可参考：[媒体服务API文档AudioRecorder](../reference/apis/js-apis-media.md) ### 全流程场景 包含流程：创建实例，设置录制参数，录制音频，暂停录制，恢复录制，停止录制，释放资源等流程。 ```js 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 } } ``` ### 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。 ```js 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 } } ``` ## 相关实例 针对音频录制开发，有以下相关实例可供参考： - [`Recorder:`录音机（eTS）（API8）（Full SDK）](https://gitee.com/openharmony/applications_app_samples/tree/master/media/Recorder) - [`eTsAudioPlayer`: 音频播放器（eTS）（API8）](https://gitee.com/openharmony/applications_app_samples/blob/master/media/Recorder/entry/src/main/ets/MainAbility/pages/Play.ets) - [音频播放器（eTS）（API9）](https://gitee.com/openharmony/codelabs/tree/master/Media/Audio_OH_ETS)