Implement out-of-band video compositing on Android: Step 1

content/browser/android/external_video_surface_view_holder.cc

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/browser/android/external_video_surface_view_holder.h"
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_string.h"
+#include "base/android/scoped_java_ref.h"
+#include "base/bind.h"
+#include "base/lazy_instance.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop.h"
+#include "jni/ExternalVideoSurfaceViewHolder_jni.h"
+#include "media/base/android/media_player_bridge.h"
+
+using base::android::AttachCurrentThread;
+using media::MediaPlayerBridge;
+
+namespace content {
+
+// static
+bool ExternalVideoSurfaceViewHolder::RegisterExternalVideoSurfaceViewHolder(
+    JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+ExternalVideoSurfaceViewHolder::ExternalVideoSurfaceViewHolder(JNIEnv* env,
+                                                               jobject obj)
+  : java_ref_(env, obj),
+    player_(NULL) {
+}
+
+ExternalVideoSurfaceViewHolder::~ExternalVideoSurfaceViewHolder() {
+}
+
+void ExternalVideoSurfaceViewHolder::registerPlayer(MediaPlayerBridge* player) {
+  DCHECK(player);
+
+  if (player_) {
+    unregisterPlayer(player_);
+  }
+  player_ = player;
+
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
+  if (obj.is_null())
+    return;
+  Java_ExternalVideoSurfaceViewHolder_requestExternalVideoSurface(
+      env, obj.obj());
+}
+
+void ExternalVideoSurfaceViewHolder::unregisterPlayer(
+    MediaPlayerBridge* player) {
+  if (player_ == player) {
+    player_->SetVideoSurface(NULL);
+    player_ = NULL;
+  }
+}
+
+// static
+jint Init(JNIEnv* env, jobject obj) {
+  ExternalVideoSurfaceViewHolder* external_video_surface_view_holder =
+      new ExternalVideoSurfaceViewHolder(env, obj);
+  return reinterpret_cast<jint>(external_video_surface_view_holder);
+}
+
+void ExternalVideoSurfaceViewHolder::Destroy(JNIEnv* env, jobject obj) {
+  delete this;
+}
+
+void ExternalVideoSurfaceViewHolder::AttachExternalVideoSurface(
+    JNIEnv* env, jobject obj, jobject jsurface) {
+  if (player_)
+    player_->SetVideoSurface(jsurface);
+}
+
+void ExternalVideoSurfaceViewHolder::DetachExternalVideoSurface(
+    JNIEnv* env, jobject obj) {
+  if (player_)
+    player_->SetVideoSurface(NULL);
+}
+
+}  // namespace content