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当前位置： 首页 > 售后 > 艺源智库
【小程序】小程序•小故事(7)——小程序音频能力介绍
时间：2018-07-26 14:35:05
文章发布：杜凯
原创作者： link
来源：微信开发者

小程序支持播放和录制音频。小程序播放音频的方式有两种：内部音频和背景音频。
1.内部音频支持用户在使用小程序过程中播放音效;
2.背景音频支持在用户离开小程序后继续播放音效。

一、播放音频

(一)背景音频

播放背景音频
背景音频接口适用于音乐类小程序，如“音乐站”、“QQ 音乐小电台”。通过 wx.getBackgroundAudioManager() 接口可以获取全局独一的背景音频管理器，所有关于背景音频的操作都由它来实现。

微信内只有一个背景音频，一个小程序开始播放背景音频之后，就持有背景音频播放器，只要当前小程序持有背景音频播放器，即使这个小程序进入后台（即用户离开小程序），也可以继续使用背景音频接口，且当前小程序不会被微信主动回收；一旦背景音频播放器被抢占（可能是其他小程序、微信内其他音乐、其他 App 的音乐），则小程序不再持有背景音频播放器。


（音乐站小程序）


在系统播放面板显示和控制

通过设置标题、专辑名、歌手名、封面图等属性，小程序音频接口支持在系统音乐播放面板显示出来。通过响应系统面板的点击事件（onPrev，onNext），可以实现列表播放。

640_看图王.jpg

（系统播放面板控制效果）

(二)内部音频

播放内部音频

内部音频适用于所有小程序，尤其是游戏类目的小程序，如“跳一跳”。通过 wx.createInnerAudioContext() 接口可以创建一个音频实例。

每个小程序可以同时持有和播放多个内部音频，但一旦小程序进入后台（onHide），所有内部音频都会被暂停，且在用户回到前台（即打开小程序）之前无法再被播放。

静音下也能播放

在 iOS 系统中，内部音频默认遵循静音键设置。如果希望在静音时也能播放，可以设置 obeyMuteSwitch 为 false。

安卓系统没有统一的静音开关，暂不支持此特性。

处理音频中断事件

以游戏为例，在游戏中，经常有播放使用内部音频来播放游戏背景音乐的场景。音频中断事件指的是在游戏期间，音频被系统打断时触发的事件。音频中断事件分为中断开始和中断结束事件，分别使用 wx.onAudioInterruptionBegin() 和 wx.onAudioInterruptionEnd() 来监听。

以下事件会触发音频中断开始事件：接到电话、闹钟响起、系统提醒、收到微信好友的语音/视频通话请求。被中断之后，小游戏内所有音频会被暂停，并在中断结束之前都不能再播放成功。

中断结束之后，被暂停的音频不会自动继续播放，游戏可监听音频中断结束事件，并在收到中断结束事件之后调用背景音乐继续播放。

如果游戏的逻辑强依赖音乐的播放（如音乐类游戏），需要在音频开始中断的时候暂停游戏

12_看图王.web.jpg

（跳一跳小游戏）


二、录制音频

通过 wx.getRecorderManager 接口，可以获取全局独一的录音管理器。

实现边录边传
默认情况下，录音结束后会生成一个本地文件，并通过回调返回本地文件的地址。对于实时性要求比较高的小程序（如“面对面翻译”），可以通过设置 frameSize 参数来设置一个帧的大小，这样每录制指定帧大小的内容后，会通过 onFrameRecorded 回调返回本次分片的数据。

注意事项：不建议使用的历史接口

上述接口可以满足所有音频相关的需求。除了上述接口，小程序内还有若干跟音频相关的接口（如 wx.startRecord、wx.playVoice、wx.playBackgroundAudio 等）。这些接口由于早期设计存在一些缺陷，我们不建议继续使用。


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