[android] Add httpEngine prop for configurable ExoPlayer data source

Video.js

@@ -476,6 +476,7 @@ Video.propTypes = {
   reportBandwidth: PropTypes.bool,
   disableFocus: PropTypes.bool,
   controls: PropTypes.bool,
+  httpEngine: PropTypes.string,
   audioOnly: PropTypes.bool,
   currentTime: PropTypes.number,
   fullscreenAutorotate: PropTypes.bool,

android-exoplayer/src/main/java/com/brentvatne/exoplayer/DataSourceUtil.java

@@ -13,6 +13,7 @@
 
 import okhttp3.JavaNetCookieJar;
 import okhttp3.OkHttpClient;
+import java.util.HashMap;
 import java.util.Map;
 
 public class DataSourceUtil {
@@ -24,6 +25,7 @@ private DataSourceUtil() {
     private static DataSource.Factory defaultDataSourceFactory = null;
     private static HttpDataSource.Factory defaultHttpDataSourceFactory = null;
     private static String userAgent = null;
+    private static final Map<String, DataSource.Factory> namedDataSourceFactories = new HashMap<>();
 
     public static void setUserAgent(String userAgent) {
         DataSourceUtil.userAgent = userAgent;
@@ -70,6 +72,15 @@ public static void setDefaultHttpDataSourceFactory(HttpDataSource.Factory factor
         DataSourceUtil.defaultHttpDataSourceFactory = factory;
     }
 
+    public static void registerDataSourceFactory(String name, DataSource.Factory factory) {
+        namedDataSourceFactories.put(name, factory);
+    }
+
+    public static DataSource.Factory getNamedDataSourceFactory(String name) {
+        DataSource.Factory factory = namedDataSourceFactories.get(name);
+        return factory != null ? factory : defaultDataSourceFactory;
+    }
+
     private static DataSource.Factory buildRawDataSourceFactory(ReactContext context) {
         return new RawResourceDataSourceFactory(context.getApplicationContext());
     }

android-exoplayer/src/main/java/com/brentvatne/exoplayer/ReactExoplayerView.java

@@ -149,6 +149,7 @@ class ReactExoplayerView extends FrameLayout implements
     private float mProgressUpdateInterval = 250.0f;
     private boolean playInBackground = false;
     private Map<String, String> requestHeaders;
+    private String httpEngine = null;
     private boolean mReportBandwidth = false;
     private UUID drmUUID = null;
     private String drmLicenseUrl = null;
@@ -647,6 +648,12 @@ private void clearResumePosition() {
      * @return A new DataSource factory.
      */
     private DataSource.Factory buildDataSourceFactory(boolean useBandwidthMeter) {
+        if (httpEngine != null && !httpEngine.isEmpty() && !httpEngine.equals("default")) {
+            DataSource.Factory namedFactory = DataSourceUtil.getNamedDataSourceFactory(httpEngine);
+            if (namedFactory != null) {
+                return namedFactory;
+            }
+        }
         return DataSourceUtil.getDefaultDataSourceFactory(this.themedReactContext,
                 useBandwidthMeter ? bandwidthMeter : null, requestHeaders);
     }
@@ -1038,9 +1045,7 @@ public void setSrc(final Uri uri, final String extension, Map<String, String> he
             this.srcUri = uri;
             this.extension = extension;
             this.requestHeaders = headers;
-            this.mediaDataSourceFactory =
-                    DataSourceUtil.getDefaultDataSourceFactory(this.themedReactContext, bandwidthMeter,
-                            this.requestHeaders);
+            this.mediaDataSourceFactory = buildDataSourceFactory(true);
 
             if (!isSourceEqual) {
                 reloadSource();
@@ -1312,6 +1317,13 @@ public void setDisableFocus(boolean disableFocus) {
         this.disableFocus = disableFocus;
     }
 
+    public void setHttpEngine(String httpEngine) {
+        this.httpEngine = httpEngine;
+        if (srcUri != null) {
+            this.mediaDataSourceFactory = buildDataSourceFactory(true);
+        }
+    }
+
     public void setFullscreen(boolean fullscreen) {
         if (fullscreen == isFullscreen) {
             return; // Avoid generating events when nothing is changing

android-exoplayer/src/main/java/com/brentvatne/exoplayer/ReactExoplayerViewManager.java

@@ -71,6 +71,7 @@ public class ReactExoplayerViewManager extends ViewGroupManager<ReactExoplayerVi
     private static final String PROP_SELECTED_VIDEO_TRACK_VALUE = "value";
     private static final String PROP_HIDE_SHUTTER_VIEW = "hideShutterView";
     private static final String PROP_CONTROLS = "controls";
+    private static final String PROP_HTTP_ENGINE = "httpEngine";
 
     private ReactExoplayerConfig config;
 
@@ -323,6 +324,11 @@ public void setControls(final ReactExoplayerView videoView, final boolean contro
         videoView.setControls(controls);
     }
 
+    @ReactProp(name = PROP_HTTP_ENGINE)
+    public void setHttpEngine(final ReactExoplayerView videoView, @Nullable final String httpEngine) {
+        videoView.setHttpEngine(httpEngine);
+    }
+
     @ReactProp(name = PROP_BUFFER_CONFIG)
     public void setBufferConfig(final ReactExoplayerView videoView, @Nullable ReadableMap bufferConfig) {
         int minBufferMs = DefaultLoadControl.DEFAULT_MIN_BUFFER_MS;