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    當前位置: 首頁 > 售后 > 藝源智庫
    【小程序】小程序?小故事(7)——小程序音頻能力介紹
    時間:2018-07-26 14:35:05
    文章發布:杜凱
    原創作者: link
    來源:微信開發者

    小程序支持播放和錄制音頻。小程序播放音頻的方式有兩種:內部音頻和背景音頻。
    1.內部音頻支持用戶在使用小程序過程中播放音效;
    2.背景音頻支持在用戶離開小程序后繼續播放音效。

    一、播放音頻

    (一)背景音頻

    播放背景音頻
    背景音頻接口適用于音樂類小程序,如“音樂站”、“QQ 音樂小電臺”。通過 wx.getBackgroundAudioManager() 接口可以獲取全局獨一的背景音頻管理器,所有關于背景音頻的操作都由它來實現。

    微信內只有一個背景音頻,一個小程序開始播放背景音頻之后,就持有背景音頻播放器,只要當前小程序持有背景音頻播放器,即使這個小程序進入后臺(即用戶離開小程序),也可以繼續使用背景音頻接口,且當前小程序不會被微信主動回收;一旦背景音頻播放器被搶占(可能是其他小程序、微信內其他音樂、其他 App 的音樂),則小程序不再持有背景音頻播放器。


    (音樂站小程序)


    在系統播放面板顯示和控制

    通過設置標題、專輯名、歌手名、封面圖等屬性,小程序音頻接口支持在系統音樂播放面板顯示出來。通過響應系統面板的點擊事件(onPrev,onNext),可以實現列表播放。

    640_看圖王.jpg

    系統播放面板控制效果)

    (二)內部音頻

    播放內部音頻

    內部音頻適用于所有小程序,尤其是游戲類目的小程序,如“跳一跳”。通過 wx.createInnerAudioContext() 接口可以創建一個音頻實例。

    每個小程序可以同時持有和播放多個內部音頻,但一旦小程序進入后臺(onHide),所有內部音頻都會被暫停,且在用戶回到前臺(即打開小程序)之前無法再被播放。

    靜音下也能播放

    在 iOS 系統中,內部音頻默認遵循靜音鍵設置。如果希望在靜音時也能播放,可以設置 obeyMuteSwitch 為 false。

    安卓系統沒有統一的靜音開關,暫不支持此特性。

    處理音頻中斷事件

    以游戲為例,在游戲中,經常有播放使用內部音頻來播放游戲背景音樂的場景。音頻中斷事件指的是在游戲期間,音頻被系統打斷時觸發的事件。音頻中斷事件分為中斷開始和中斷結束事件,分別使用 wx.onAudioInterruptionBegin() 和 wx.onAudioInterruptionEnd() 來監聽。

    以下事件會觸發音頻中斷開始事件:接到電話、鬧鐘響起、系統提醒、收到微信好友的語音/視頻通話請求。被中斷之后,小游戲內所有音頻會被暫停,并在中斷結束之前都不能再播放成功。

    中斷結束之后,被暫停的音頻不會自動繼續播放,游戲可監聽音頻中斷結束事件,并在收到中斷結束事件之后調用背景音樂繼續播放。

    如果游戲的邏輯強依賴音樂的播放(如音樂類游戲),需要在音頻開始中斷的時候暫停游戲

    12_看圖王.web.jpg

    (跳一跳小游戲)


    二、錄制音頻

    通過 wx.getRecorderManager 接口,可以獲取全局獨一的錄音管理器。

    實現邊錄邊傳
    認情況下,錄音結束后會生成一個本地文件,并通過回調返回本地文件的地址。對于實時性要求比較高的小程序(如“面對面翻譯”),可以通過設置 frameSize 參數來設置一個幀的大小,這樣每錄制指定幀大小的內容后,會通過 onFrameRecorded 回調返回本次分片的數據。

    注意事項:不建議使用的歷史接口

    上述接口可以滿足所有音頻相關的需求。除了上述接口,小程序內還有若干跟音頻相關的接口(如 wx.startRecord、wx.playVoice、wx.playBackgroundAudio 等)。這些接口由于早期設計存在一些缺陷,我們不建議繼續使用。


    小程序開發
    標簽: 小程序
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