1 files changed, 312 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/util/EGLSurfaceTexture.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/util/EGLSurfaceTexture.java
new file mode 100644
index 0000000000..1f48f718b7
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/util/EGLSurfaceTexture.java
@@ -0,0 +1,312 @@
+/*
+ * Copyright (C) 2018 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 org.mozilla.thirdparty.com.google.android.exoplayer2.util;
+
+import android.annotation.TargetApi;
+import android.graphics.SurfaceTexture;
+import android.opengl.EGL14;
+import android.opengl.EGLConfig;
+import android.opengl.EGLContext;
+import android.opengl.EGLDisplay;
+import android.opengl.EGLSurface;
+import android.opengl.GLES20;
+import android.os.Handler;
+import androidx.annotation.IntDef;
+import androidx.annotation.Nullable;
+import java.lang.annotation.Documented;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+/** Generates a {@link SurfaceTexture} using EGL/GLES functions. */
+@TargetApi(17)
+public final class EGLSurfaceTexture implements SurfaceTexture.OnFrameAvailableListener, Runnable {
+
+  /** Listener to be called when the texture image on {@link SurfaceTexture} has been updated. */
+  public interface TextureImageListener {
+    /** Called when the {@link SurfaceTexture} receives a new frame from its image producer. */
+    void onFrameAvailable();
+  }
+
+  /**
+   * Secure mode to be used by the EGL surface and context. One of {@link #SECURE_MODE_NONE}, {@link
+   * #SECURE_MODE_SURFACELESS_CONTEXT} or {@link #SECURE_MODE_PROTECTED_PBUFFER}.
+   */
+  @Documented
+  @Retention(RetentionPolicy.SOURCE)
+  @IntDef({SECURE_MODE_NONE, SECURE_MODE_SURFACELESS_CONTEXT, SECURE_MODE_PROTECTED_PBUFFER})
+  public @interface SecureMode {}
+
+  /** No secure EGL surface and context required. */
+  public static final int SECURE_MODE_NONE = 0;
+  /** Creating a surfaceless, secured EGL context. */
+  public static final int SECURE_MODE_SURFACELESS_CONTEXT = 1;
+  /** Creating a secure surface backed by a pixel buffer. */
+  public static final int SECURE_MODE_PROTECTED_PBUFFER = 2;
+
+  private static final int EGL_SURFACE_WIDTH = 1;
+  private static final int EGL_SURFACE_HEIGHT = 1;
+
+  private static final int[] EGL_CONFIG_ATTRIBUTES =
+      new int[] {
+        EGL14.EGL_RENDERABLE_TYPE, EGL14.EGL_OPENGL_ES2_BIT,
+        EGL14.EGL_RED_SIZE, 8,
+        EGL14.EGL_GREEN_SIZE, 8,
+        EGL14.EGL_BLUE_SIZE, 8,
+        EGL14.EGL_ALPHA_SIZE, 8,
+        EGL14.EGL_DEPTH_SIZE, 0,
+        EGL14.EGL_CONFIG_CAVEAT, EGL14.EGL_NONE,
+        EGL14.EGL_SURFACE_TYPE, EGL14.EGL_WINDOW_BIT,
+        EGL14.EGL_NONE
+      };
+
+  private static final int EGL_PROTECTED_CONTENT_EXT = 0x32C0;
+
+  /** A runtime exception to be thrown if some EGL operations failed. */
+  public static final class GlException extends RuntimeException {
+    private GlException(String msg) {
+      super(msg);
+    }
+  }
+
+  private final Handler handler;
+  private final int[] textureIdHolder;
+  @Nullable private final TextureImageListener callback;
+
+  @Nullable private EGLDisplay display;
+  @Nullable private EGLContext context;
+  @Nullable private EGLSurface surface;
+  @Nullable private SurfaceTexture texture;
+
+  /**
+   * @param handler The {@link Handler} that will be used to call {@link
+   *     SurfaceTexture#updateTexImage()} to update images on the {@link SurfaceTexture}. Note that
+   *     {@link #init(int)} has to be called on the same looper thread as the {@link Handler}'s
+   *     looper.
+   */
+  public EGLSurfaceTexture(Handler handler) {
+    this(handler, /* callback= */ null);
+  }
+
+  /**
+   * @param handler The {@link Handler} that will be used to call {@link
+   *     SurfaceTexture#updateTexImage()} to update images on the {@link SurfaceTexture}. Note that
+   *     {@link #init(int)} has to be called on the same looper thread as the looper of the {@link
+   *     Handler}.
+   * @param callback The {@link TextureImageListener} to be called when the texture image on {@link
+   *     SurfaceTexture} has been updated. This callback will be called on the same handler thread
+   *     as the {@code handler}.
+   */
+  public EGLSurfaceTexture(Handler handler, @Nullable TextureImageListener callback) {
+    this.handler = handler;
+    this.callback = callback;
+    textureIdHolder = new int[1];
+  }
+
+  /**
+   * Initializes required EGL parameters and creates the {@link SurfaceTexture}.
+   *
+   * @param secureMode The {@link SecureMode} to be used for EGL surface.
+   */
+  public void init(@SecureMode int secureMode) {
+    display = getDefaultDisplay();
+    EGLConfig config = chooseEGLConfig(display);
+    context = createEGLContext(display, config, secureMode);
+    surface = createEGLSurface(display, config, context, secureMode);
+    generateTextureIds(textureIdHolder);
+    texture = new SurfaceTexture(textureIdHolder[0]);
+    texture.setOnFrameAvailableListener(this);
+  }
+
+  /** Releases all allocated resources. */
+  @SuppressWarnings({"nullness:argument.type.incompatible"})
+  public void release() {
+    handler.removeCallbacks(this);
+    try {
+      if (texture != null) {
+        texture.release();
+        GLES20.glDeleteTextures(1, textureIdHolder, 0);
+      }
+    } finally {
+      if (display != null && !display.equals(EGL14.EGL_NO_DISPLAY)) {
+        EGL14.eglMakeCurrent(
+            display, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_CONTEXT);
+      }
+      if (surface != null && !surface.equals(EGL14.EGL_NO_SURFACE)) {
+        EGL14.eglDestroySurface(display, surface);
+      }
+      if (context != null) {
+        EGL14.eglDestroyContext(display, context);
+      }
+      // EGL14.eglReleaseThread could crash before Android K (see [internal: b/11327779]).
+      if (Util.SDK_INT >= 19) {
+        EGL14.eglReleaseThread();
+      }
+      if (display != null && !display.equals(EGL14.EGL_NO_DISPLAY)) {
+        // Android is unusual in that it uses a reference-counted EGLDisplay.  So for
+        // every eglInitialize() we need an eglTerminate().
+        EGL14.eglTerminate(display);
+      }
+      display = null;
+      context = null;
+      surface = null;
+      texture = null;
+    }
+  }
+
+  /**
+   * Returns the wrapped {@link SurfaceTexture}. This can only be called after {@link #init(int)}.
+   */
+  public SurfaceTexture getSurfaceTexture() {
+    return Assertions.checkNotNull(texture);
+  }
+
+  // SurfaceTexture.OnFrameAvailableListener
+
+  @Override
+  public void onFrameAvailable(SurfaceTexture surfaceTexture) {
+    handler.post(this);
+  }
+
+  // Runnable
+
+  @Override
+  public void run() {
+    // Run on the provided handler thread when a new image frame is available.
+    dispatchOnFrameAvailable();
+    if (texture != null) {
+      try {
+        texture.updateTexImage();
+      } catch (RuntimeException e) {
+        // Ignore
+      }
+    }
+  }
+
+  private void dispatchOnFrameAvailable() {
+    if (callback != null) {
+      callback.onFrameAvailable();
+    }
+  }
+
+  private static EGLDisplay getDefaultDisplay() {
+    EGLDisplay display = EGL14.eglGetDisplay(EGL14.EGL_DEFAULT_DISPLAY);
+    if (display == null) {
+      throw new GlException("eglGetDisplay failed");
+    }
+
+    int[] version = new int[2];
+    boolean eglInitialized =
+        EGL14.eglInitialize(display, version, /* majorOffset= */ 0, version, /* minorOffset= */ 1);
+    if (!eglInitialized) {
+      throw new GlException("eglInitialize failed");
+    }
+    return display;
+  }
+
+  private static EGLConfig chooseEGLConfig(EGLDisplay display) {
+    EGLConfig[] configs = new EGLConfig[1];
+    int[] numConfigs = new int[1];
+    boolean success =
+        EGL14.eglChooseConfig(
+            display,
+            EGL_CONFIG_ATTRIBUTES,
+            /* attrib_listOffset= */ 0,
+            configs,
+            /* configsOffset= */ 0,
+            /* config_size= */ 1,
+            numConfigs,
+            /* num_configOffset= */ 0);
+    if (!success || numConfigs[0] <= 0 || configs[0] == null) {
+      throw new GlException(
+          Util.formatInvariant(
+              /* format= */ "eglChooseConfig failed: success=%b, numConfigs[0]=%d, configs[0]=%s",
+              success, numConfigs[0], configs[0]));
+    }
+
+    return configs[0];
+  }
+
+  private static EGLContext createEGLContext(
+      EGLDisplay display, EGLConfig config, @SecureMode int secureMode) {
+    int[] glAttributes;
+    if (secureMode == SECURE_MODE_NONE) {
+      glAttributes = new int[] {EGL14.EGL_CONTEXT_CLIENT_VERSION, 2, EGL14.EGL_NONE};
+    } else {
+      glAttributes =
+          new int[] {
+            EGL14.EGL_CONTEXT_CLIENT_VERSION,
+            2,
+            EGL_PROTECTED_CONTENT_EXT,
+            EGL14.EGL_TRUE,
+            EGL14.EGL_NONE
+          };
+    }
+    EGLContext context =
+        EGL14.eglCreateContext(
+            display, config, android.opengl.EGL14.EGL_NO_CONTEXT, glAttributes, 0);
+    if (context == null) {
+      throw new GlException("eglCreateContext failed");
+    }
+    return context;
+  }
+
+  private static EGLSurface createEGLSurface(
+      EGLDisplay display, EGLConfig config, EGLContext context, @SecureMode int secureMode) {
+    EGLSurface surface;
+    if (secureMode == SECURE_MODE_SURFACELESS_CONTEXT) {
+      surface = EGL14.EGL_NO_SURFACE;
+    } else {
+      int[] pbufferAttributes;
+      if (secureMode == SECURE_MODE_PROTECTED_PBUFFER) {
+        pbufferAttributes =
+            new int[] {
+              EGL14.EGL_WIDTH,
+              EGL_SURFACE_WIDTH,
+              EGL14.EGL_HEIGHT,
+              EGL_SURFACE_HEIGHT,
+              EGL_PROTECTED_CONTENT_EXT,
+              EGL14.EGL_TRUE,
+              EGL14.EGL_NONE
+            };
+      } else {
+        pbufferAttributes =
+            new int[] {
+              EGL14.EGL_WIDTH,
+              EGL_SURFACE_WIDTH,
+              EGL14.EGL_HEIGHT,
+              EGL_SURFACE_HEIGHT,
+              EGL14.EGL_NONE
+            };
+      }
+      surface = EGL14.eglCreatePbufferSurface(display, config, pbufferAttributes, /* offset= */ 0);
+      if (surface == null) {
+        throw new GlException("eglCreatePbufferSurface failed");
+      }
+    }
+
+    boolean eglMadeCurrent =
+        EGL14.eglMakeCurrent(display, /* draw= */ surface, /* read= */ surface, context);
+    if (!eglMadeCurrent) {
+      throw new GlException("eglMakeCurrent failed");
+    }
+    return surface;
+  }
+
+  private static void generateTextureIds(int[] textureIdHolder) {
+    GLES20.glGenTextures(/* n= */ 1, textureIdHolder, /* offset= */ 0);
+    GlUtil.checkGlError();
+  }
+}