Add GL demo app

Demonstrates rendering to a GLSurfaceView while applying a GL shader.

Issue: #6920
PiperOrigin-RevId: 293551724

RELEASENOTES.md

@@ -42,6 +42,10 @@
 * UI
   * move logic of prev, next, fast forward and rewind to ControlDispatcher
   [#6926](https://github.com/google/ExoPlayer/issues/6926)).
+* Demo apps: Add
+  [GL demo app](https://github.com/google/ExoPlayer/tree/dev-v2/demos/gl) to
+  show how to render video to a `GLSurfaceView` while applying a GL shader.
+  ([#6920](https://github.com/google/ExoPlayer/issues/6920)).
 
 ### 2.11.2 (TBD) ###
 

demos/gl/README.md

@@ -0,0 +1,11 @@
+# ExoPlayer GL demo
+
+This app demonstrates how to render video to a [GLSurfaceView][] while applying
+a GL shader.
+
+The shader shows an overlap bitmap on top of the video. The overlay bitmap is
+drawn using an Android canvas, and includes the current frame's presentation
+timestamp, to show how to get the timestamp of the frame currently in the
+off-screen surface texture.
+
+[GLSurfaceView]: https://developer.android.com/reference/android/opengl/GLSurfaceView

demos/gl/build.gradle

@@ -0,0 +1,53 @@
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+apply from: '../../constants.gradle'
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion project.ext.compileSdkVersion
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    defaultConfig {
+        versionName project.ext.releaseVersion
+        versionCode project.ext.releaseVersionCode
+        minSdkVersion project.ext.minSdkVersion
+        targetSdkVersion project.ext.appTargetSdkVersion
+    }
+
+    buildTypes {
+        release {
+            shrinkResources true
+            minifyEnabled true
+            proguardFiles getDefaultProguardFile('proguard-android.txt')
+        }
+    }
+
+    lintOptions {
+        // This demo app does not have translations.
+        disable 'MissingTranslation'
+    }
+}
+
+dependencies {
+    implementation project(modulePrefix + 'library-core')
+    implementation project(modulePrefix + 'library-ui')
+    implementation project(modulePrefix + 'library-dash')
+    implementation 'androidx.annotation:annotation:' + androidxAnnotationVersion
+    compileOnly 'org.checkerframework:checker-qual:' + checkerframeworkVersion
+    compileOnly 'org.checkerframework:checker-compat-qual:' + checkerframeworkVersion
+}

demos/gl/src/main/AndroidManifest.xml

@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2020 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.google.android.exoplayer2.gldemo">
+
+  <uses-permission android:name="android.permission.INTERNET"/>
+  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
+
+  <uses-sdk/>
+
+  <application
+      android:allowBackup="false"
+      android:icon="@mipmap/ic_launcher"
+      android:label="@string/application_name">
+
+    <activity
+        android:name=".MainActivity"
+        android:exported="true">
+      <intent-filter>
+        <action android:name="android.intent.action.MAIN"/>
+        <category android:name="android.intent.category.LAUNCHER"/>
+      </intent-filter>
+      <intent-filter>
+        <action android:name="com.google.android.exoplayer.gldemo.action.VIEW"/>
+        <category android:name="android.intent.category.DEFAULT"/>
+        <data android:scheme="http"/>
+        <data android:scheme="https"/>
+        <data android:scheme="content"/>
+        <data android:scheme="asset"/>
+        <data android:scheme="file"/>
+      </intent-filter>
+    </activity>
+
+  </application>
+
+</manifest>

demos/gl/src/main/assets/bitmap_overlay_video_processor_fragment.glsl

@@ -0,0 +1,35 @@
+// Copyright 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#extension GL_OES_EGL_image_external : require
+precision mediump float;
+// External texture containing video decoder output.
+uniform samplerExternalOES tex_sampler_0;
+// Texture containing the overlap bitmap.
+uniform sampler2D tex_sampler_1;
+// Horizontal scaling factor for the overlap bitmap.
+uniform float scaleX;
+// Vertical scaling factory for the overlap bitmap.
+uniform float scaleY;
+varying vec2 v_texcoord;
+void main() {
+  vec4 videoColor = texture2D(tex_sampler_0, v_texcoord);
+  vec4 overlayColor = texture2D(tex_sampler_1,
+                                vec2(v_texcoord.x * scaleX,
+                                     v_texcoord.y * scaleY));
+  // Blend the video decoder output and the overlay bitmap.
+  gl_FragColor = videoColor * (1.0 - overlayColor.a)
+      + overlayColor * overlayColor.a;
+}
+

demos/gl/src/main/assets/bitmap_overlay_video_processor_vertex.glsl

@@ -0,0 +1,21 @@
+// Copyright 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+attribute vec4 a_position;
+attribute vec3 a_texcoord;
+varying vec2 v_texcoord;
+void main() {
+ gl_Position = a_position;
+ v_texcoord = a_texcoord.xy;
+}
+

demos/gl/src/main/java/com/google/android/exoplayer2/gldemo/BitmapOverlayVideoProcessor.java

@@ -0,0 +1,176 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.android.exoplayer2.gldemo;
+
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.drawable.BitmapDrawable;
+import android.opengl.GLES20;
+import android.opengl.GLUtils;
+import androidx.annotation.Nullable;
+import com.google.android.exoplayer2.C;
+import com.google.android.exoplayer2.util.Assertions;
+import com.google.android.exoplayer2.util.GlUtil;
+import com.google.android.exoplayer2.util.Util;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Locale;
+import javax.microedition.khronos.opengles.GL10;
+
+/**
+ * Video processor that demonstrates how to overlay a bitmap on video output using a GL shader. The
+ * bitmap is drawn using an Android {@link Canvas}.
+ */
+/* package */ final class BitmapOverlayVideoProcessor
+    implements VideoProcessingGLSurfaceView.VideoProcessor {
+
+  private static final int OVERLAY_WIDTH = 512;
+  private static final int OVERLAY_HEIGHT = 256;
+
+  private final Context context;
+  private final Paint paint;
+  private final int[] textures;
+  private final Bitmap overlayBitmap;
+  private final Bitmap logoBitmap;
+  private final Canvas overlayCanvas;
+
+  private int program;
+  @Nullable private GlUtil.Attribute[] attributes;
+  @Nullable private GlUtil.Uniform[] uniforms;
+
+  private float bitmapScaleX;
+  private float bitmapScaleY;
+
+  public BitmapOverlayVideoProcessor(Context context) {
+    this.context = context.getApplicationContext();
+    paint = new Paint();
+    paint.setTextSize(64);
+    paint.setAntiAlias(true);
+    paint.setARGB(0xFF, 0xFF, 0xFF, 0xFF);
+    textures = new int[1];
+    overlayBitmap = Bitmap.createBitmap(OVERLAY_WIDTH, OVERLAY_HEIGHT, Bitmap.Config.ARGB_8888);
+    overlayCanvas = new Canvas(overlayBitmap);
+    try {
+      logoBitmap =
+          ((BitmapDrawable)
+                  context.getPackageManager().getApplicationIcon(context.getPackageName()))
+              .getBitmap();
+    } catch (PackageManager.NameNotFoundException e) {
+      throw new IllegalStateException(e);
+    }
+  }
+
+  @Override
+  public void initialize() {
+    String vertexShaderCode =
+        loadAssetAsString(context, "bitmap_overlay_video_processor_vertex.glsl");
+    String fragmentShaderCode =
+        loadAssetAsString(context, "bitmap_overlay_video_processor_fragment.glsl");
+    program = GlUtil.compileProgram(vertexShaderCode, fragmentShaderCode);
+    GlUtil.Attribute[] attributes = GlUtil.getAttributes(program);
+    GlUtil.Uniform[] uniforms = GlUtil.getUniforms(program);
+    for (GlUtil.Attribute attribute : attributes) {
+      if (attribute.name.equals("a_position")) {
+        attribute.setBuffer(
+            new float[] {
+              -1.0f, -1.0f, 0.0f, 1.0f, 1.0f, -1.0f, 0.0f, 1.0f, -1.0f, 1.0f, 0.0f, 1.0f, 1.0f,
+              1.0f, 0.0f, 1.0f,
+            },
+            4);
+      } else if (attribute.name.equals("a_texcoord")) {
+        attribute.setBuffer(
+            new float[] {
+              0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f,
+            },
+            3);
+      }
+    }
+    this.attributes = attributes;
+    this.uniforms = uniforms;
+    GLES20.glGenTextures(1, textures, 0);
+    GLES20.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]);
+    GLES20.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_NEAREST);
+    GLES20.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR);
+    GLES20.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S, GL10.GL_REPEAT);
+    GLES20.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T, GL10.GL_REPEAT);
+    GLUtils.texImage2D(GL10.GL_TEXTURE_2D, /* level= */ 0, overlayBitmap, /* border= */ 0);
+  }
+
+  @Override
+  public void setSurfaceSize(int width, int height) {
+    bitmapScaleX = (float) width / OVERLAY_WIDTH;
+    bitmapScaleY = (float) height / OVERLAY_HEIGHT;
+  }
+
+  @Override
+  public void draw(int frameTexture, long frameTimestampUs) {
+    // Draw to the canvas and store it in a texture.
+    String text = String.format(Locale.US, "%.02f", frameTimestampUs / (float) C.MICROS_PER_SECOND);
+    overlayBitmap.eraseColor(Color.TRANSPARENT);
+    overlayCanvas.drawBitmap(logoBitmap, /* left= */ 32, /* top= */ 32, paint);
+    overlayCanvas.drawText(text, /* x= */ 200, /* y= */ 130, paint);
+    GLES20.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]);
+    GLUtils.texSubImage2D(
+        GL10.GL_TEXTURE_2D, /* level= */ 0, /* xoffset= */ 0, /* yoffset= */ 0, overlayBitmap);
+    GlUtil.checkGlError();
+
+    // Run the shader program.
+    GlUtil.Uniform[] uniforms = Assertions.checkNotNull(this.uniforms);
+    GlUtil.Attribute[] attributes = Assertions.checkNotNull(this.attributes);
+    GLES20.glUseProgram(program);
+    for (GlUtil.Uniform uniform : uniforms) {
+      switch (uniform.name) {
+        case "tex_sampler_0":
+          uniform.setSamplerTexId(frameTexture, /* unit= */ 0);
+          break;
+        case "tex_sampler_1":
+          uniform.setSamplerTexId(textures[0], /* unit= */ 1);
+          break;
+        case "scaleX":
+          uniform.setFloat(bitmapScaleX);
+          break;
+        case "scaleY":
+          uniform.setFloat(bitmapScaleY);
+          break;
+      }
+    }
+    for (GlUtil.Attribute copyExternalAttribute : attributes) {
+      copyExternalAttribute.bind();
+    }
+    for (GlUtil.Uniform copyExternalUniform : uniforms) {
+      copyExternalUniform.bind();
+    }
+    GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
+    GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, /* first= */ 0, /* count= */ 4);
+    GlUtil.checkGlError();
+  }
+
+  private static String loadAssetAsString(Context context, String assetFileName) {
+    @Nullable InputStream inputStream = null;
+    try {
+      inputStream = context.getAssets().open(assetFileName);
+      return Util.fromUtf8Bytes(Util.toByteArray(inputStream));
+    } catch (IOException e) {
+      throw new IllegalStateException(e);
+    } finally {
+      Util.closeQuietly(inputStream);
+    }
+  }
+}

demos/gl/src/main/java/com/google/android/exoplayer2/gldemo/MainActivity.java

@@ -0,0 +1,200 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.android.exoplayer2.gldemo;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.Intent;
+import android.net.Uri;
+import android.os.Bundle;
+import android.widget.FrameLayout;
+import android.widget.Toast;
+import androidx.annotation.Nullable;
+import com.google.android.exoplayer2.C;
+import com.google.android.exoplayer2.Player;
+import com.google.android.exoplayer2.SimpleExoPlayer;
+import com.google.android.exoplayer2.drm.DefaultDrmSessionManager;
+import com.google.android.exoplayer2.drm.DrmSessionManager;
+import com.google.android.exoplayer2.drm.ExoMediaCrypto;
+import com.google.android.exoplayer2.drm.FrameworkMediaDrm;
+import com.google.android.exoplayer2.drm.HttpMediaDrmCallback;
+import com.google.android.exoplayer2.source.MediaSource;
+import com.google.android.exoplayer2.source.ProgressiveMediaSource;
+import com.google.android.exoplayer2.source.dash.DashMediaSource;
+import com.google.android.exoplayer2.ui.PlayerView;
+import com.google.android.exoplayer2.upstream.DataSource;
+import com.google.android.exoplayer2.upstream.DefaultDataSourceFactory;
+import com.google.android.exoplayer2.upstream.DefaultHttpDataSourceFactory;
+import com.google.android.exoplayer2.upstream.HttpDataSource;
+import com.google.android.exoplayer2.util.Assertions;
+import com.google.android.exoplayer2.util.EventLogger;
+import com.google.android.exoplayer2.util.GlUtil;
+import com.google.android.exoplayer2.util.Util;
+import java.util.UUID;
+
+/**
+ * Activity that demonstrates playback of video to an {@link android.opengl.GLSurfaceView} with
+ * postprocessing of the video content using GL.
+ */
+public final class MainActivity extends Activity {
+
+  private static final String TAG = "MainActivity";
+
+  private static final String DEFAULT_MEDIA_URI =
+      "https://storage.googleapis.com/exoplayer-test-media-1/mkv/android-screens-lavf-56.36.100-aac-avc-main-1280x720.mkv";
+
+  private static final String ACTION_VIEW = "com.google.android.exoplayer.gldemo.action.VIEW";
+  private static final String EXTENSION_EXTRA = "extension";
+  private static final String DRM_SCHEME_EXTRA = "drm_scheme";
+  private static final String DRM_LICENSE_URL_EXTRA = "drm_license_url";
+
+  @Nullable private PlayerView playerView;
+  @Nullable private VideoProcessingGLSurfaceView videoProcessingGLSurfaceView;
+
+  @Nullable private SimpleExoPlayer player;
+
+  @Override
+  protected void onCreate(@Nullable Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+    setContentView(R.layout.main_activity);
+    playerView = findViewById(R.id.player_view);
+
+    Context context = getApplicationContext();
+    boolean requestSecureSurface = getIntent().hasExtra(DRM_SCHEME_EXTRA);
+    if (requestSecureSurface && !GlUtil.isProtectedContentExtensionSupported(context)) {
+      Toast.makeText(
+              context, R.string.error_protected_content_extension_not_supported, Toast.LENGTH_LONG)
+          .show();
+    }
+
+    VideoProcessingGLSurfaceView videoProcessingGLSurfaceView =
+        new VideoProcessingGLSurfaceView(
+            context, requestSecureSurface, new BitmapOverlayVideoProcessor(context));
+    FrameLayout contentFrame = findViewById(R.id.exo_content_frame);
+    contentFrame.addView(videoProcessingGLSurfaceView);
+    this.videoProcessingGLSurfaceView = videoProcessingGLSurfaceView;
+  }
+
+  @Override
+  public void onStart() {
+    super.onStart();
+    if (Util.SDK_INT > 23) {
+      initializePlayer();
+      if (playerView != null) {
+        playerView.onResume();
+      }
+    }
+  }
+
+  @Override
+  public void onResume() {
+    super.onResume();
+    if (Util.SDK_INT <= 23 || player == null) {
+      initializePlayer();
+      if (playerView != null) {
+        playerView.onResume();
+      }
+    }
+  }
+
+  @Override
+  public void onPause() {
+    super.onPause();
+    if (Util.SDK_INT <= 23) {
+      if (playerView != null) {
+        playerView.onPause();
+      }
+      releasePlayer();
+    }
+  }
+
+  @Override
+  public void onStop() {
+    super.onStop();
+    if (Util.SDK_INT > 23) {
+      if (playerView != null) {
+        playerView.onPause();
+      }
+      releasePlayer();
+    }
+  }
+
+  private void initializePlayer() {
+    Intent intent = getIntent();
+    String action = intent.getAction();
+    Uri uri =
+        ACTION_VIEW.equals(action)
+            ? Assertions.checkNotNull(intent.getData())
+            : Uri.parse(DEFAULT_MEDIA_URI);
+    String userAgent = Util.getUserAgent(this, getString(R.string.application_name));
+    DrmSessionManager<ExoMediaCrypto> drmSessionManager;
+    if (Util.SDK_INT >= 18 && intent.hasExtra(DRM_SCHEME_EXTRA)) {
+      String drmScheme = Assertions.checkNotNull(intent.getStringExtra(DRM_SCHEME_EXTRA));
+      String drmLicenseUrl = Assertions.checkNotNull(intent.getStringExtra(DRM_LICENSE_URL_EXTRA));
+      UUID drmSchemeUuid = Assertions.checkNotNull(Util.getDrmUuid(drmScheme));
+      HttpDataSource.Factory licenseDataSourceFactory = new DefaultHttpDataSourceFactory(userAgent);
+      HttpMediaDrmCallback drmCallback =
+          new HttpMediaDrmCallback(drmLicenseUrl, licenseDataSourceFactory);
+      drmSessionManager =
+          new DefaultDrmSessionManager.Builder()
+              .setUuidAndExoMediaDrmProvider(drmSchemeUuid, FrameworkMediaDrm.DEFAULT_PROVIDER)
+              .build(drmCallback);
+    } else {
+      drmSessionManager = DrmSessionManager.getDummyDrmSessionManager();
+    }
+
+    DataSource.Factory dataSourceFactory =
+        new DefaultDataSourceFactory(
+            this, Util.getUserAgent(this, getString(R.string.application_name)));
+    MediaSource mediaSource;
+    @C.ContentType int type = Util.inferContentType(uri, intent.getStringExtra(EXTENSION_EXTRA));
+    if (type == C.TYPE_DASH) {
+      mediaSource =
+          new DashMediaSource.Factory(dataSourceFactory)
+              .setDrmSessionManager(drmSessionManager)
+              .createMediaSource(uri);
+    } else if (type == C.TYPE_OTHER) {
+      mediaSource =
+          new ProgressiveMediaSource.Factory(dataSourceFactory)
+              .setDrmSessionManager(drmSessionManager)
+              .createMediaSource(uri);
+    } else {
+      throw new IllegalStateException();
+    }
+
+    SimpleExoPlayer player = new SimpleExoPlayer.Builder(getApplicationContext()).build();
+    player.setRepeatMode(Player.REPEAT_MODE_ALL);
+    player.setMediaSource(mediaSource);
+    player.prepare();
+    player.play();
+    VideoProcessingGLSurfaceView videoProcessingGLSurfaceView =
+        Assertions.checkNotNull(this.videoProcessingGLSurfaceView);
+    videoProcessingGLSurfaceView.setVideoComponent(
+        Assertions.checkNotNull(player.getVideoComponent()));
+    Assertions.checkNotNull(playerView).setPlayer(player);
+    player.addAnalyticsListener(new EventLogger(/* trackSelector= */ null));
+    this.player = player;
+  }
+
+  private void releasePlayer() {
+    Assertions.checkNotNull(playerView).setPlayer(null);
+    if (player != null) {
+      player.release();
+      Assertions.checkNotNull(videoProcessingGLSurfaceView).setVideoComponent(null);
+      player = null;
+    }
+  }
+}

demos/gl/src/main/java/com/google/android/exoplayer2/gldemo/VideoProcessingGLSurfaceView.java

@@ -0,0 +1,290 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.android.exoplayer2.gldemo;
+
+import android.content.Context;
+import android.graphics.SurfaceTexture;
+import android.media.MediaFormat;
+import android.opengl.EGL14;
+import android.opengl.GLES20;
+import android.opengl.GLSurfaceView;
+import android.os.Handler;
+import android.view.Surface;
+import androidx.annotation.Nullable;
+import com.google.android.exoplayer2.Format;
+import com.google.android.exoplayer2.Player;
+import com.google.android.exoplayer2.util.Assertions;
+import com.google.android.exoplayer2.util.GlUtil;
+import com.google.android.exoplayer2.util.TimedValueQueue;
+import com.google.android.exoplayer2.video.VideoFrameMetadataListener;
+import java.util.concurrent.atomic.AtomicBoolean;
+import javax.microedition.khronos.egl.EGL10;
+import javax.microedition.khronos.egl.EGLConfig;
+import javax.microedition.khronos.egl.EGLContext;
+import javax.microedition.khronos.egl.EGLDisplay;
+import javax.microedition.khronos.egl.EGLSurface;
+import javax.microedition.khronos.opengles.GL10;
+
+/**
+ * {@link GLSurfaceView} that creates a GL context (optionally for protected content) and passes
+ * video frames to a {@link VideoProcessor} for drawing to the view.
+ *
+ * <p>This view must be created programmatically, as it is necessary to specify whether a context
+ * supporting protected content should be created at construction time.
+ */
+public final class VideoProcessingGLSurfaceView extends GLSurfaceView {
+
+  /** Processes video frames, provided via a GL texture. */
+  public interface VideoProcessor {
+    /** Performs any required GL initialization. */
+    void initialize();
+
+    /** Sets the size of the output surface in pixels. */
+    void setSurfaceSize(int width, int height);
+
+    /**
+     * Draws using GL operations.
+     *
+     * @param frameTexture The ID of a GL texture containing a video frame.
+     * @param frameTimestampUs The presentation timestamp of the frame, in microseconds.
+     */
+    void draw(int frameTexture, long frameTimestampUs);
+  }
+
+  private static final int EGL_PROTECTED_CONTENT_EXT = 0x32C0;
+
+  private final VideoRenderer renderer;
+  private final Handler mainHandler;
+
+  @Nullable private SurfaceTexture surfaceTexture;
+  @Nullable private Surface surface;
+  @Nullable private Player.VideoComponent videoComponent;
+
+  /**
+   * Creates a new instance. Pass {@code true} for {@code requireSecureContext} if the {@link
+   * GLSurfaceView GLSurfaceView's} associated GL context should handle secure content (if the
+   * device supports it).
+   *
+   * @param context The {@link Context}.
+   * @param requireSecureContext Whether a GL context supporting protected content should be
+   *     created, if supported by the device.
+   * @param videoProcessor Processor that draws to the view.
+   */
+  public VideoProcessingGLSurfaceView(
+      Context context, boolean requireSecureContext, VideoProcessor videoProcessor) {
+    super(context);
+    renderer = new VideoRenderer(videoProcessor);
+    mainHandler = new Handler();
+    setEGLContextClientVersion(2);
+    setEGLConfigChooser(
+        /* redSize= */ 8,
+        /* greenSize= */ 8,
+        /* blueSize= */ 8,
+        /* alphaSize= */ 8,
+        /* depthSize= */ 0,
+        /* stencilSize= */ 0);
+    setEGLContextFactory(
+        new EGLContextFactory() {
+          @Override
+          public EGLContext createContext(EGL10 egl, EGLDisplay display, EGLConfig eglConfig) {
+            int[] glAttributes;
+            if (requireSecureContext) {
+              glAttributes =
+                  new int[] {
+                    EGL14.EGL_CONTEXT_CLIENT_VERSION,
+                    2,
+                    EGL_PROTECTED_CONTENT_EXT,
+                    EGL14.EGL_TRUE,
+                    EGL14.EGL_NONE
+                  };
+            } else {
+              glAttributes = new int[] {EGL14.EGL_CONTEXT_CLIENT_VERSION, 2, EGL14.EGL_NONE};
+            }
+            return egl.eglCreateContext(
+                display, eglConfig, /* share_context= */ EGL10.EGL_NO_CONTEXT, glAttributes);
+          }
+
+          @Override
+          public void destroyContext(EGL10 egl, EGLDisplay display, EGLContext context) {
+            egl.eglDestroyContext(display, context);
+          }
+        });
+    setEGLWindowSurfaceFactory(
+        new EGLWindowSurfaceFactory() {
+          @Override
+          public EGLSurface createWindowSurface(
+              EGL10 egl, EGLDisplay display, EGLConfig config, Object nativeWindow) {
+            int[] attribsList =
+                requireSecureContext
+                    ? new int[] {EGL_PROTECTED_CONTENT_EXT, EGL14.EGL_TRUE, EGL10.EGL_NONE}
+                    : new int[] {EGL10.EGL_NONE};
+            return egl.eglCreateWindowSurface(display, config, nativeWindow, attribsList);
+          }
+
+          @Override
+          public void destroySurface(EGL10 egl, EGLDisplay display, EGLSurface surface) {
+            egl.eglDestroySurface(display, surface);
+          }
+        });
+    setRenderer(renderer);
+    setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);
+  }
+
+  /**
+   * Attaches or detaches (if {@code newVideoComponent} is {@code null}) this view from the video
+   * component of the player.
+   *
+   * @param newVideoComponent The new video component, or {@code null} to detach this view.
+   */
+  public void setVideoComponent(@Nullable Player.VideoComponent newVideoComponent) {
+    if (newVideoComponent == videoComponent) {
+      return;
+    }
+    if (videoComponent != null) {
+      if (surface != null) {
+        videoComponent.clearVideoSurface(surface);
+      }
+      videoComponent.clearVideoFrameMetadataListener(renderer);
+    }
+    videoComponent = newVideoComponent;
+    if (videoComponent != null) {
+      videoComponent.setVideoFrameMetadataListener(renderer);
+      videoComponent.setVideoSurface(surface);
+    }
+  }
+
+  @Override
+  protected void onDetachedFromWindow() {
+    super.onDetachedFromWindow();
+    // Post to make sure we occur in order with any onSurfaceTextureAvailable calls.
+    mainHandler.post(
+        () -> {
+          if (surface != null) {
+            if (videoComponent != null) {
+              videoComponent.setVideoSurface(null);
+            }
+            releaseSurface(surfaceTexture, surface);
+            surfaceTexture = null;
+            surface = null;
+          }
+        });
+  }
+
+  private void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture) {
+    mainHandler.post(
+        () -> {
+          SurfaceTexture oldSurfaceTexture = this.surfaceTexture;
+          Surface oldSurface = VideoProcessingGLSurfaceView.this.surface;
+          this.surfaceTexture = surfaceTexture;
+          this.surface = new Surface(surfaceTexture);
+          releaseSurface(oldSurfaceTexture, oldSurface);
+          if (videoComponent != null) {
+            videoComponent.setVideoSurface(surface);
+          }
+        });
+  }
+
+  private static void releaseSurface(
+      @Nullable SurfaceTexture oldSurfaceTexture, @Nullable Surface oldSurface) {
+    if (oldSurfaceTexture != null) {
+      oldSurfaceTexture.release();
+    }
+    if (oldSurface != null) {
+      oldSurface.release();
+    }
+  }
+
+  private final class VideoRenderer implements GLSurfaceView.Renderer, VideoFrameMetadataListener {
+
+    private final VideoProcessor videoProcessor;
+    private final AtomicBoolean frameAvailable;
+    private final TimedValueQueue<Long> sampleTimestampQueue;
+
+    private int texture;
+    @Nullable private SurfaceTexture surfaceTexture;
+
+    private boolean initialized;
+    private int width;
+    private int height;
+    private long frameTimestampUs;
+
+    public VideoRenderer(VideoProcessor videoProcessor) {
+      this.videoProcessor = videoProcessor;
+      frameAvailable = new AtomicBoolean();
+      sampleTimestampQueue = new TimedValueQueue<>();
+      width = -1;
+      height = -1;
+    }
+
+    @Override
+    public synchronized void onSurfaceCreated(GL10 gl, EGLConfig config) {
+      texture = GlUtil.createExternalTexture();
+      surfaceTexture = new SurfaceTexture(texture);
+      surfaceTexture.setOnFrameAvailableListener(
+          surfaceTexture -> {
+            frameAvailable.set(true);
+            requestRender();
+          });
+      onSurfaceTextureAvailable(surfaceTexture);
+    }
+
+    @Override
+    public void onSurfaceChanged(GL10 gl, int width, int height) {
+      GLES20.glViewport(0, 0, width, height);
+      this.width = width;
+      this.height = height;
+    }
+
+    @Override
+    public void onDrawFrame(GL10 gl) {
+      if (videoProcessor == null) {
+        return;
+      }
+
+      if (!initialized) {
+        videoProcessor.initialize();
+        initialized = true;
+      }
+
+      if (width != -1 && height != -1) {
+        videoProcessor.setSurfaceSize(width, height);
+        width = -1;
+        height = -1;
+      }
+
+      if (frameAvailable.compareAndSet(true, false)) {
+        SurfaceTexture surfaceTexture = Assertions.checkNotNull(this.surfaceTexture);
+        surfaceTexture.updateTexImage();
+        long lastFrameTimestampNs = surfaceTexture.getTimestamp();
+        Long frameTimestampUs = sampleTimestampQueue.poll(lastFrameTimestampNs);
+        if (frameTimestampUs != null) {
+          this.frameTimestampUs = frameTimestampUs;
+        }
+      }
+
+      videoProcessor.draw(texture, frameTimestampUs);
+    }
+
+    @Override
+    public void onVideoFrameAboutToBeRendered(
+        long presentationTimeUs,
+        long releaseTimeNs,
+        Format format,
+        @Nullable MediaFormat mediaFormat) {
+      sampleTimestampQueue.add(releaseTimeNs, presentationTimeUs);
+    }
+  }
+}

demos/gl/src/main/res/layout/main_activity.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2020 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<FrameLayout
+  xmlns:android="http://schemas.android.com/apk/res/android"
+  xmlns:app="http://schemas.android.com/apk/res-auto"
+  android:layout_width="match_parent"
+  android:layout_height="match_parent"
+  android:keepScreenOn="true">
+
+  <com.google.android.exoplayer2.ui.PlayerView
+    android:id="@+id/player_view"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    app:surface_type="none"/>
+
+</FrameLayout>
+

demos/gl/src/main/res/values/strings.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2020 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<resources>
+
+  <string name="application_name">ExoPlayer GL demo</string>
+
+  <string name="error_protected_content_extension_not_supported">The GL protected content extension is not supported.</string>
+
+</resources>

library/core/src/main/java/com/google/android/exoplayer2/util/GlUtil.java

@@ -17,23 +17,235 @@ package com.google.android.exoplayer2.util;
 
 import static android.opengl.GLU.gluErrorString;
 
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.opengl.EGL14;
+import android.opengl.EGLDisplay;
 import android.opengl.GLES11Ext;
 import android.opengl.GLES20;
 import android.text.TextUtils;
+import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.ExoPlayerLibraryInfo;
+import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 import java.nio.FloatBuffer;
 import java.nio.IntBuffer;
+import javax.microedition.khronos.egl.EGL10;
 
-/** GL utility methods. */
+/** GL utilities. */
 public final class GlUtil {
+
+  /**
+   * GL attribute, which can be attached to a buffer with {@link Attribute#setBuffer(float[], int)}.
+   */
+  public static final class Attribute {
+
+    /** The name of the attribute in the GLSL sources. */
+    public final String name;
+
+    private final int index;
+    private final int location;
+
+    @Nullable private Buffer buffer;
+    private int size;
+
+    /**
+     * Creates a new GL attribute.
+     *
+     * @param program The identifier of a compiled and linked GLSL shader program.
+     * @param index The index of the attribute. After this instance has been constructed, the name
+     *     of the attribute is available via the {@link #name} field.
+     */
+    public Attribute(int program, int index) {
+      int[] len = new int[1];
+      GLES20.glGetProgramiv(program, GLES20.GL_ACTIVE_ATTRIBUTE_MAX_LENGTH, len, 0);
+
+      int[] type = new int[1];
+      int[] size = new int[1];
+      byte[] nameBytes = new byte[len[0]];
+      int[] ignore = new int[1];
+
+      GLES20.glGetActiveAttrib(program, index, len[0], ignore, 0, size, 0, type, 0, nameBytes, 0);
+      name = new String(nameBytes, 0, strlen(nameBytes));
+      location = GLES20.glGetAttribLocation(program, name);
+      this.index = index;
+    }
+
+    /**
+     * Configures {@link #bind()} to attach vertices in {@code buffer} (each of size {@code size}
+     * elements) to this {@link Attribute}.
+     *
+     * @param buffer Buffer to bind to this attribute.
+     * @param size Number of elements per vertex.
+     */
+    public void setBuffer(float[] buffer, int size) {
+      this.buffer = createBuffer(buffer);
+      this.size = size;
+    }
+
+    /**
+     * Sets the vertex attribute to whatever was attached via {@link #setBuffer(float[], int)}.
+     *
+     * <p>Should be called before each drawing call.
+     */
+    public void bind() {
+      Buffer buffer = Assertions.checkNotNull(this.buffer, "call setBuffer before bind");
+      GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, 0);
+      GLES20.glVertexAttribPointer(
+          location,
+          size, // count
+          GLES20.GL_FLOAT, // type
+          false, // normalize
+          0, // stride
+          buffer);
+      GLES20.glEnableVertexAttribArray(index);
+      checkGlError();
+    }
+  }
+
+  /**
+   * GL uniform, which can be attached to a sampler using {@link Uniform#setSamplerTexId(int, int)}.
+   */
+  public static final class Uniform {
+
+    /** The name of the uniform in the GLSL sources. */
+    public final String name;
+
+    private final int location;
+    private final int type;
+    private final float[] value;
+
+    private int texId;
+    private int unit;
+
+    /**
+     * Creates a new GL uniform.
+     *
+     * @param program The identifier of a compiled and linked GLSL shader program.
+     * @param index The index of the uniform. After this instance has been constructed, the name of
+     *     the uniform is available via the {@link #name} field.
+     */
+    public Uniform(int program, int index) {
+      int[] len = new int[1];
+      GLES20.glGetProgramiv(program, GLES20.GL_ACTIVE_UNIFORM_MAX_LENGTH, len, 0);
+
+      int[] type = new int[1];
+      int[] size = new int[1];
+      byte[] name = new byte[len[0]];
+      int[] ignore = new int[1];
+
+      GLES20.glGetActiveUniform(program, index, len[0], ignore, 0, size, 0, type, 0, name, 0);
+      this.name = new String(name, 0, strlen(name));
+      location = GLES20.glGetUniformLocation(program, this.name);
+      this.type = type[0];
+
+      value = new float[1];
+    }
+
+    /**
+     * Configures {@link #bind()} to use the specified {@code texId} for this sampler uniform.
+     *
+     * @param texId The GL texture identifier from which to sample.
+     * @param unit The GL texture unit index.
+     */
+    public void setSamplerTexId(int texId, int unit) {
+      this.texId = texId;
+      this.unit = unit;
+    }
+
+    /** Configures {@link #bind()} to use the specified float {@code value} for this uniform. */
+    public void setFloat(float value) {
+      this.value[0] = value;
+    }
+
+    /**
+     * Sets the uniform to whatever value was passed via {@link #setSamplerTexId(int, int)} or
+     * {@link #setFloat(float)}.
+     *
+     * <p>Should be called before each drawing call.
+     */
+    public void bind() {
+      if (type == GLES20.GL_FLOAT) {
+        GLES20.glUniform1fv(location, 1, value, 0);
+        checkGlError();
+        return;
+      }
+
+      if (texId == 0) {
+        throw new IllegalStateException("call setSamplerTexId before bind");
+      }
+      GLES20.glActiveTexture(GLES20.GL_TEXTURE0 + unit);
+      if (type == GLES11Ext.GL_SAMPLER_EXTERNAL_OES) {
+        GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, texId);
+      } else if (type == GLES20.GL_SAMPLER_2D) {
+        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texId);
+      } else {
+        throw new IllegalStateException("unexpected uniform type: " + type);
+      }
+      GLES20.glUniform1i(location, unit);
+      GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
+      GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
+      GLES20.glTexParameteri(
+          GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
+      GLES20.glTexParameteri(
+          GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
+      checkGlError();
+    }
+  }
+
   private static final String TAG = "GlUtil";
 
+  private static final String EXTENSION_PROTECTED_CONTENT = "EGL_EXT_protected_content";
+  private static final String EXTENSION_SURFACELESS_CONTEXT = "EGL_KHR_surfaceless_context";
+
   /** Class only contains static methods. */
   private GlUtil() {}
 
+  /**
+   * Returns whether creating a GL context with {@value EXTENSION_PROTECTED_CONTENT} is possible. If
+   * {@code true}, the device supports a protected output path for DRM content when using GL.
+   */
+  @TargetApi(24)
+  public static boolean isProtectedContentExtensionSupported(Context context) {
+    if (Util.SDK_INT < 24) {
+      return false;
+    }
+    if (Util.SDK_INT < 26 && ("samsung".equals(Util.MANUFACTURER) || "XT1650".equals(Util.MODEL))) {
+      // Samsung devices running Nougat are known to be broken. See
+      // https://github.com/google/ExoPlayer/issues/3373 and [Internal: b/37197802].
+      // Moto Z XT1650 is also affected. See
+      // https://github.com/google/ExoPlayer/issues/3215.
+      return false;
+    }
+    if (Util.SDK_INT < 26
+        && !context
+            .getPackageManager()
+            .hasSystemFeature(PackageManager.FEATURE_VR_MODE_HIGH_PERFORMANCE)) {
+      // Pre API level 26 devices were not well tested unless they supported VR mode.
+      return false;
+    }
+
+    EGLDisplay display = EGL14.eglGetDisplay(EGL14.EGL_DEFAULT_DISPLAY);
+    @Nullable String eglExtensions = EGL14.eglQueryString(display, EGL10.EGL_EXTENSIONS);
+    return eglExtensions != null && eglExtensions.contains(EXTENSION_PROTECTED_CONTENT);
+  }
+
+  /**
+   * Returns whether creating a GL context with {@value EXTENSION_SURFACELESS_CONTEXT} is possible.
+   */
+  @TargetApi(17)
+  public static boolean isSurfacelessContextExtensionSupported() {
+    if (Util.SDK_INT < 17) {
+      return false;
+    }
+    EGLDisplay display = EGL14.eglGetDisplay(EGL14.EGL_DEFAULT_DISPLAY);
+    @Nullable String eglExtensions = EGL14.eglQueryString(display, EGL10.EGL_EXTENSIONS);
+    return eglExtensions != null && eglExtensions.contains(EXTENSION_SURFACELESS_CONTEXT);
+  }
+
   /**
    * If there is an OpenGl error, logs the error and if {@link
    * ExoPlayerLibraryInfo#GL_ASSERTIONS_ENABLED} is true throws a {@link RuntimeException}.
@@ -90,6 +302,34 @@ public final class GlUtil {
     return program;
   }
 
+  /** Returns the {@link Attribute}s in the specified {@code program}. */
+  public static Attribute[] getAttributes(int program) {
+    int[] attributeCount = new int[1];
+    GLES20.glGetProgramiv(program, GLES20.GL_ACTIVE_ATTRIBUTES, attributeCount, 0);
+    if (attributeCount[0] != 2) {
+      throw new IllegalStateException("expected two attributes");
+    }
+
+    Attribute[] attributes = new Attribute[attributeCount[0]];
+    for (int i = 0; i < attributeCount[0]; i++) {
+      attributes[i] = new Attribute(program, i);
+    }
+    return attributes;
+  }
+
+  /** Returns the {@link Uniform}s in the specified {@code program}. */
+  public static Uniform[] getUniforms(int program) {
+    int[] uniformCount = new int[1];
+    GLES20.glGetProgramiv(program, GLES20.GL_ACTIVE_UNIFORMS, uniformCount, 0);
+
+    Uniform[] uniforms = new Uniform[uniformCount[0]];
+    for (int i = 0; i < uniformCount[0]; i++) {
+      uniforms[i] = new Uniform(program, i);
+    }
+
+    return uniforms;
+  }
+
   /**
    * Allocates a FloatBuffer with the given data.
    *
@@ -151,4 +391,14 @@ public final class GlUtil {
       throw new RuntimeException(errorMsg);
     }
   }
+
+  /** Returns the length of the null-terminated string in {@code strVal}. */
+  private static int strlen(byte[] strVal) {
+    for (int i = 0; i < strVal.length; ++i) {
+      if (strVal[i] == '\0') {
+        return i;
+      }
+    }
+    return strVal.length;
+  }
 }

library/core/src/main/java/com/google/android/exoplayer2/video/DummySurface.java

@@ -20,10 +20,7 @@ import static com.google.android.exoplayer2.util.EGLSurfaceTexture.SECURE_MODE_P
 import static com.google.android.exoplayer2.util.EGLSurfaceTexture.SECURE_MODE_SURFACELESS_CONTEXT;
 
 import android.content.Context;
-import android.content.pm.PackageManager;
 import android.graphics.SurfaceTexture;
-import android.opengl.EGL14;
-import android.opengl.EGLDisplay;
 import android.os.Handler;
 import android.os.Handler.Callback;
 import android.os.HandlerThread;
@@ -34,9 +31,9 @@ import androidx.annotation.RequiresApi;
 import com.google.android.exoplayer2.util.Assertions;
 import com.google.android.exoplayer2.util.EGLSurfaceTexture;
 import com.google.android.exoplayer2.util.EGLSurfaceTexture.SecureMode;
+import com.google.android.exoplayer2.util.GlUtil;
 import com.google.android.exoplayer2.util.Log;
 import com.google.android.exoplayer2.util.Util;
-import javax.microedition.khronos.egl.EGL10;
 import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 
 /** A dummy {@link Surface}. */
@@ -45,9 +42,6 @@ public final class DummySurface extends Surface {
 
   private static final String TAG = "DummySurface";
 
-  private static final String EXTENSION_PROTECTED_CONTENT = "EGL_EXT_protected_content";
-  private static final String EXTENSION_SURFACELESS_CONTEXT = "EGL_KHR_surfaceless_context";
-
   /**
    * Whether the surface is secure.
    */
@@ -67,7 +61,7 @@ public final class DummySurface extends Surface {
    */
   public static synchronized boolean isSecureSupported(Context context) {
     if (!secureModeInitialized) {
-      secureMode = Util.SDK_INT < 24 ? SECURE_MODE_NONE : getSecureModeV24(context);
+      secureMode = getSecureMode(context);
       secureModeInitialized = true;
     }
     return secureMode != SECURE_MODE_NONE;
@@ -119,34 +113,21 @@ public final class DummySurface extends Surface {
     }
   }
 
-  @RequiresApi(24)
-  private static @SecureMode int getSecureModeV24(Context context) {
-    if (Util.SDK_INT < 26 && ("samsung".equals(Util.MANUFACTURER) || "XT1650".equals(Util.MODEL))) {
-      // Samsung devices running Nougat are known to be broken. See
-      // https://github.com/google/ExoPlayer/issues/3373 and [Internal: b/37197802].
-      // Moto Z XT1650 is also affected. See
-      // https://github.com/google/ExoPlayer/issues/3215.
+  @SecureMode
+  private static int getSecureMode(Context context) {
+    if (GlUtil.isProtectedContentExtensionSupported(context)) {
+      if (GlUtil.isSurfacelessContextExtensionSupported()) {
+        return SECURE_MODE_SURFACELESS_CONTEXT;
+      } else {
+        // If we can't use surfaceless contexts, we use a protected 1 * 1 pixel buffer surface.
+        // This may require support for EXT_protected_surface, but in practice it works on some
+        // devices that don't have that extension. See also
+        // https://github.com/google/ExoPlayer/issues/3558.
+        return SECURE_MODE_PROTECTED_PBUFFER;
+      }
+    } else {
       return SECURE_MODE_NONE;
     }
-    if (Util.SDK_INT < 26 && !context.getPackageManager().hasSystemFeature(
-        PackageManager.FEATURE_VR_MODE_HIGH_PERFORMANCE)) {
-      // Pre API level 26 devices were not well tested unless they supported VR mode.
-      return SECURE_MODE_NONE;
-    }
-    EGLDisplay display = EGL14.eglGetDisplay(EGL14.EGL_DEFAULT_DISPLAY);
-    String eglExtensions = EGL14.eglQueryString(display, EGL10.EGL_EXTENSIONS);
-    if (eglExtensions == null) {
-      return SECURE_MODE_NONE;
-    }
-    if (!eglExtensions.contains(EXTENSION_PROTECTED_CONTENT)) {
-      return SECURE_MODE_NONE;
-    }
-    // If we can't use surfaceless contexts, we use a protected 1 * 1 pixel buffer surface. This may
-    // require support for EXT_protected_surface, but in practice it works on some devices that
-    // don't have that extension. See also https://github.com/google/ExoPlayer/issues/3558.
-    return eglExtensions.contains(EXTENSION_SURFACELESS_CONTEXT)
-        ? SECURE_MODE_SURFACELESS_CONTEXT
-        : SECURE_MODE_PROTECTED_PBUFFER;
   }
 
   private static class DummySurfaceThread extends HandlerThread implements Callback {

settings.gradle

@@ -20,10 +20,12 @@ if (gradle.ext.has('exoplayerModulePrefix')) {
 
 include modulePrefix + 'demo'
 include modulePrefix + 'demo-cast'
+include modulePrefix + 'demo-gl'
 include modulePrefix + 'demo-surface'
 include modulePrefix + 'playbacktests'
 project(modulePrefix + 'demo').projectDir = new File(rootDir, 'demos/main')
 project(modulePrefix + 'demo-cast').projectDir = new File(rootDir, 'demos/cast')
+project(modulePrefix + 'demo-gl').projectDir = new File(rootDir, 'demos/gl')
 project(modulePrefix + 'demo-surface').projectDir = new File(rootDir, 'demos/surface')
 project(modulePrefix + 'playbacktests').projectDir = new File(rootDir, 'playbacktests')