stagefright: add support for limiting framerate in GraphicBufferSource

Bug: 19014096
Change-Id: I6de781e4d140a247dfd8fd8f12c3ddd7baa39ad4

1 files changed, 50 insertions, 0 deletions

diff --git a/media/libstagefright/omx/FrameDropper.h b/media/libstagefright/omx/FrameDropper.h
new file mode 100644
index 0000000..c5a6d4b
--- /dev/null
+++ b/media/libstagefright/omx/FrameDropper.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2015 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 FRAME_DROPPER_H_
+
+#define FRAME_DROPPER_H_
+
+#include <utils/Errors.h>
+#include <utils/RefBase.h>
+
+#include <media/stagefright/foundation/ABase.h>
+
+namespace android {
+
+struct FrameDropper : public RefBase {
+    // No frames will be dropped until a valid max frame rate is set.
+    FrameDropper();
+
+    // maxFrameRate required to be positive.
+    status_t setMaxFrameRate(float maxFrameRate);
+
+    // Returns false if max frame rate has not been set via setMaxFrameRate.
+    bool shouldDrop(int64_t timeUs);
+
+protected:
+    virtual ~FrameDropper();
+
+private:
+    int64_t mDesiredMinTimeUs;
+    int64_t mMinIntervalUs;
+
+    DISALLOW_EVIL_CONSTRUCTORS(FrameDropper);
+};
+
+}  // namespace android
+
+#endif  // FRAME_DROPPER_H_