update 清晰度切换

live/src/main/java/com/yunbao/live/utils/LiveExoPlayerManager.java

@@ -14,17 +14,21 @@ import com.google.android.exoplayer2.analytics.PlaybackStats;
 import com.google.android.exoplayer2.analytics.PlaybackStatsListener;
 import com.google.android.exoplayer2.video.VideoSize;
 
+/**
+ * 直播间播放器管理器
+ * 通过预加载子播放器来实现无缝切换分辨率功能
+ */
 public class LiveExoPlayerManager {
-    private final int MODEL_PLAY1 = 0;
-    private final int MODEL_PLAY2 = 1;
+    private final int MODEL_PLAY1 = 0;//当前主播放器
+    private final int MODEL_PLAY2 = 1;//当前子播放器
     private Context mContext;
     private ExoPlayer player1, player2;
-    private SurfaceView mainView;
+    private SurfaceView mainView;//渲染视图
     private int status = MODEL_PLAY1;
     private Player.Listener listener;
-    private boolean isSwitchUrl = false;
+    private boolean isSwitchUrl = false;//是否为主动切换播放器
     private String TAG = "播放";
-    private int playBufferIndex = 0;
+    private int playBufferIndex = 0;//卡顿计数器
     private Handler handler;
 
     public LiveExoPlayerManager(Context mContext) {
@@ -75,6 +79,9 @@ public class LiveExoPlayerManager {
 
     }
 
+    /**
+     * 延迟1秒还未恢复播放则认为卡顿了，可以切分辨率了
+     */
     private Runnable buffRunnable = new Runnable() {
         @Override
         public void run() {
@@ -185,6 +192,11 @@ public class LiveExoPlayerManager {
         });
     }
 
+    /**
+     * 开始播放
+     *
+     * @param url 地址
+     */
     public void startUrl(String url) {
         isSwitchUrl = true;
         playBufferIndex = 0;
@@ -194,6 +206,11 @@ public class LiveExoPlayerManager {
         getNowPlayer().play();
     }
 
+    /**
+     * 无缝切换
+     *
+     * @param url 地址
+     */
     public void switchUrl(String url) {
         Log.i(TAG, "switchUrl: " + url);
         playBufferIndex = 0;
@@ -206,26 +223,44 @@ public class LiveExoPlayerManager {
         return MediaItem.fromUri(url);
     }
 
+    /**
+     * 获取当前播放器
+     */
     public ExoPlayer getNowPlayer() {
         return status == MODEL_PLAY1 ? player1 : player2;
     }
 
+    /**
+     * 获取下一个播放器。
+     */
     private ExoPlayer getNextPlayer() {
         return status == MODEL_PLAY1 ? player2 : player1;
     }
 
+    /**
+     * 是否正在播放
+     */
     public boolean isPlaying() {
         return getNowPlayer().isPlaying();
     }
 
+    /**
+     * 停止播放
+     */
     public void stop() {
         getNowPlayer().stop();
     }
 
+    /**
+     * 开始播放
+     */
     public void play() {
         getNowPlayer().play();
     }
 
+    /**
+     * 释放播放器
+     */
     public void release() {
         player1.release();
         player2.release();