Android 媒體播放 MediaPlayer

媒體分兩個部分整理

1 媒體的播放過程,視訊/音樂是如何播放的

google官網

2 媒體的架構,如何在api基礎上對播放狀态控制

1 播放流程

MediaPlayer mediaPlayer = MediaPlayer.create(context, R.raw.sound_file_1);
    mediaPlayer.start(); // no need to call prepare(); create() does that for you
           

public static MediaPlayer create(Context context, int resid,
            AudioAttributes audioAttributes, int audioSessionId) {
        try {
            AssetFileDescriptor afd = context.getResources().openRawResourceFd(resid);
            if (afd == null) return null;

            MediaPlayer mp = new MediaPlayer();

            final AudioAttributes aa = audioAttributes != null ? audioAttributes :
                new AudioAttributes.Builder().build();
            mp.setAudioAttributes(aa);
            mp.setAudioSessionId(audioSessionId);

            mp.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
            afd.close();
            mp.prepare();
            return mp;
        } catch (IOException ex) {
            Log.d(TAG, "create failed:", ex);
            // fall through
        } catch (IllegalArgumentException ex) {
            Log.d(TAG, "create failed:", ex);
           // fall through
        } catch (SecurityException ex) {
            Log.d(TAG, "create failed:", ex);
            // fall through
        }
        return null;
    }
           

構造函數

public MediaPlayer() {
        super(new AudioAttributes.Builder().build(),
                AudioPlaybackConfiguration.PLAYER_TYPE_JAM_MEDIAPLAYER);

        Looper looper;
        if ((looper = Looper.myLooper()) != null) {
            mEventHandler = new EventHandler(this, looper);
        } else if ((looper = Looper.getMainLooper()) != null) {
            mEventHandler = new EventHandler(this, looper);
        } else {
            mEventHandler = null;
        }

        mTimeProvider = new TimeProvider(this);
        mOpenSubtitleSources = new Vector<InputStream>();

        /* Native setup requires a weak reference to our object.
         * It's easier to create it here than in C++.
         */
        native_setup(new WeakReference<MediaPlayer>(this));

        baseRegisterPlayer();
    }
           

調用JNI方法

static {
        System.loadLibrary("media_jni");
        native_init();
    }
           

省略Native方法

public void setDataSource(FileDescriptor fd, long offset, long length)
            throws IOException, IllegalArgumentException, IllegalStateException {
        _setDataSource(fd, offset, length);
    }
    
    private native void _setDataSource(FileDescriptor fd, long offset, long length)
            throws IOException, IllegalArgumentException, IllegalStateException;

           

省略Native方法

AudioTrack和MediaPlayer播放音頻有什麼差別

AudioTrack僅播放PCM格式音頻

google meida架構使用

導入依賴

開源項目

官方服務和用戶端例子

https://github.com/googlearchive/android-MediaBrowserService

https://github.com/google/ExoPlayer

開源音樂播放器

https://github.com/saulmm/Material-Movies

https://github.com/ryanhoo/StylishMusicPlayer

https://github.com/harjot-oberai/MusicDNA

https://github.com/naman14/Timber

https://github.com/wangchenyan/ponymusic

https://github.com/andremion/Music-Player

參考資料

介紹AudioTrackd到AF的流程

整體流程從MediaPlayer - > MediaPlayerService -> NuPlayer - > AT - > AF -> h

https://blog.csdn.net/zyuanyun/article/details/60890534