mediaplayer: schedule video frames in VSYNC valleys
Bug: 14659809
Change-Id: Ic340ac61ad4778b493625c79c2cb4f747ff54ede
diff --git a/media/libmediaplayerservice/VideoFrameScheduler.h b/media/libmediaplayerservice/VideoFrameScheduler.h
new file mode 100644
index 0000000..9119e45
--- /dev/null
+++ b/media/libmediaplayerservice/VideoFrameScheduler.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright 2014, 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.
+ */
+
+#ifndef VIDEO_FRAME_SCHEDULER_H_
+#define VIDEO_FRAME_SCHEDULER_H_
+
+#include <utils/RefBase.h>
+#include <utils/Timers.h>
+
+#include <media/stagefright/foundation/ABase.h>
+
+namespace android {
+
+struct ISurfaceComposer;
+
+struct VideoFrameScheduler : public RefBase {
+ VideoFrameScheduler();
+
+ // (re)initialize scheduler
+ void init();
+ // get adjusted nanotime for a video frame render at renderTime
+ nsecs_t schedule(nsecs_t renderTime);
+
+ // returns the vsync period for the main display
+ nsecs_t getVsyncPeriod();
+
+ void release();
+
+protected:
+ virtual ~VideoFrameScheduler();
+
+private:
+ void updateVsync();
+
+ nsecs_t mVsyncTime; // vsync timing from display
+ nsecs_t mVsyncPeriod;
+ nsecs_t mVsyncRefreshAt; // next time to refresh timing info
+
+ sp<ISurfaceComposer> mComposer;
+
+ DISALLOW_EVIL_CONSTRUCTORS(VideoFrameScheduler);
+};
+
+} // namespace android
+
+#endif // VIDEO_FRAME_SCHEDULER_H_
+