From 0cb34dcd1ccb5b9534b47030de495e7b5bf5e9d6 Mon Sep 17 00:00:00 2001
From: hoangtc <hoangtc@google.com>
Date: Wed, 23 May 2018 08:53:08 -0700
Subject: [PATCH] Add SurfaceCapturer base class, and provide the first
 implementation

Use PixelCopy API for the first SurfaceCapturer implementation. This supports
devices from API 24+.

Github: #3609.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=197732711
---
 .../assets/bitmap/image_256_256.png           | Bin 0 -> 1976 bytes
 .../androidTest/assets/bitmap/image_80_60.bmp | Bin 0 -> 19338 bytes
 .../surfacecapturer/SurfaceCapturer.java      |  84 ++++++++++++++++++
 .../exoplayer2/util/EGLSurfaceTexture.java    |  48 ++++++++--
 .../exoplayer2/testutil/DummyMainThread.java  |   0
 5 files changed, 127 insertions(+), 5 deletions(-)
 create mode 100644 library/core/src/androidTest/assets/bitmap/image_256_256.png
 create mode 100644 library/core/src/androidTest/assets/bitmap/image_80_60.bmp
 create mode 100644 library/core/src/main/java/com/google/android/exoplayer2/surfacecapturer/SurfaceCapturer.java
 rename {testutils_robolectric => testutils}/src/main/java/com/google/android/exoplayer2/testutil/DummyMainThread.java (100%)

diff --git a/library/core/src/androidTest/assets/bitmap/image_256_256.png b/library/core/src/androidTest/assets/bitmap/image_256_256.png
new file mode 100644
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diff --git a/library/core/src/androidTest/assets/bitmap/image_80_60.bmp b/library/core/src/androidTest/assets/bitmap/image_80_60.bmp
new file mode 100644
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diff --git a/library/core/src/main/java/com/google/android/exoplayer2/surfacecapturer/SurfaceCapturer.java b/library/core/src/main/java/com/google/android/exoplayer2/surfacecapturer/SurfaceCapturer.java
new file mode 100644
index 00000000000..4a7fd714946
--- /dev/null
+++ b/library/core/src/main/java/com/google/android/exoplayer2/surfacecapturer/SurfaceCapturer.java
@@ -0,0 +1,84 @@
+/*
+ * 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 com.google.android.exoplayer2.surfacecapturer;
+
+import android.graphics.Bitmap;
+import android.view.Surface;
+
+/**
+ * A surface capturer, which captures image drawn into its surface as bitmaps.
+ *
+ * <p>It constructs a {@link Surface}, which can be used as the output surface for an image producer
+ * to draw images to. As images are being drawn into this surface, this capturer will capture these
+ * images, and return them via {@link Callback}. The output images will have a fixed frame size of
+ * (width, height), and any image drawn into the surface will be stretched to fit this frame size.
+ */
+public abstract class SurfaceCapturer {
+
+  /** The callback to be notified of the image capturing result. */
+  public interface Callback {
+
+    /**
+     * Called when the surface capturer has been able to capture its surface into a {@link Bitmap}.
+     * This will happen whenever the producer updates the image on the wrapped surface.
+     */
+    void onSurfaceCaptured(Bitmap bitmap);
+
+    /** Called when the surface capturer couldn't capture its surface due to an error. */
+    void onSurfaceCaptureError(Exception e);
+  }
+
+  /** The callback to be notified of the image capturing result. */
+  private final Callback callback;
+  /** The width of the output images. */
+  private final int outputWidth;
+  /** The height of the output images. */
+  private final int outputHeight;
+
+  /**
+   * Constructs a new instance.
+   *
+   * @param callback See {@link #callback}.
+   * @param outputWidth See {@link #outputWidth}.
+   * @param outputHeight See {@link #outputHeight}.
+   */
+  protected SurfaceCapturer(Callback callback, int outputWidth, int outputHeight) {
+    this.callback = callback;
+    this.outputWidth = outputWidth;
+    this.outputHeight = outputHeight;
+  }
+
+  /** Returns the callback to be notified of the image capturing result. */
+  protected Callback getCallback() {
+    return callback;
+  }
+
+  /** Returns the width of the output images. */
+  public int getOutputWidth() {
+    return outputWidth;
+  }
+
+  /** Returns the height of the output images. */
+  public int getOutputHeight() {
+    return outputHeight;
+  }
+
+  /** Returns a {@link Surface} that image producers (camera, video codec etc...) can draw to. */
+  public abstract Surface getSurface();
+
+  /** Releases all kept resources. This instance cannot be used after this call. */
+  public abstract void release();
+}
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/util/EGLSurfaceTexture.java b/library/core/src/main/java/com/google/android/exoplayer2/util/EGLSurfaceTexture.java
index 6fe76b9b2cc..552a0f224da 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/util/EGLSurfaceTexture.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/util/EGLSurfaceTexture.java
@@ -33,6 +33,12 @@
 @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. */
   @Retention(RetentionPolicy.SOURCE)
   @IntDef({SECURE_MODE_NONE, SECURE_MODE_SURFACELESS_CONTEXT, SECURE_MODE_PROTECTED_PBUFFER})
@@ -45,6 +51,9 @@ public final class EGLSurfaceTexture implements SurfaceTexture.OnFrameAvailableL
   /** 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,
@@ -69,6 +78,7 @@ private GlException(String msg) {
 
   private final Handler handler;
   private final int[] textureIdHolder;
+  private final @Nullable TextureImageListener callback;
 
   private @Nullable EGLDisplay display;
   private @Nullable EGLContext context;
@@ -82,7 +92,21 @@ private GlException(String msg) {
    *     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];
   }
 
@@ -142,8 +166,20 @@ public void onFrameAvailable(SurfaceTexture surfaceTexture) {
 
   @Override
   public void run() {
+    // Run on the provided handler thread when a new image frame is available.
+    dispatchOnFrameAvailable();
     if (texture != null) {
-      texture.updateTexImage();
+      try {
+        texture.updateTexImage();
+      } catch (RuntimeException e) {
+        // Ignore
+      }
+    }
+  }
+
+  private void dispatchOnFrameAvailable() {
+    if (callback != null) {
+      callback.onFrameAvailable();
     }
   }
 
@@ -220,9 +256,9 @@ private static EGLSurface createEGLSurface(
         pbufferAttributes =
             new int[] {
               EGL14.EGL_WIDTH,
-              1,
+              EGL_SURFACE_WIDTH,
               EGL14.EGL_HEIGHT,
-              1,
+              EGL_SURFACE_HEIGHT,
               EGL_PROTECTED_CONTENT_EXT,
               EGL14.EGL_TRUE,
               EGL14.EGL_NONE
@@ -230,8 +266,10 @@ private static EGLSurface createEGLSurface(
       } else {
         pbufferAttributes =
             new int[] {
-              EGL14.EGL_WIDTH, 1,
-              EGL14.EGL_HEIGHT, 1,
+              EGL14.EGL_WIDTH,
+              EGL_SURFACE_WIDTH,
+              EGL14.EGL_HEIGHT,
+              EGL_SURFACE_HEIGHT,
               EGL14.EGL_NONE
             };
       }
diff --git a/testutils_robolectric/src/main/java/com/google/android/exoplayer2/testutil/DummyMainThread.java b/testutils/src/main/java/com/google/android/exoplayer2/testutil/DummyMainThread.java
similarity index 100%
rename from testutils_robolectric/src/main/java/com/google/android/exoplayer2/testutil/DummyMainThread.java
rename to testutils/src/main/java/com/google/android/exoplayer2/testutil/DummyMainThread.java