diff --git a/cas/1.0/default/DescramblerImpl.h b/cas/1.0/default/DescramblerImpl.h
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+++ b/cas/1.0/default/DescramblerImpl.h
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+/*
+ * Copyright (C) 2017 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 ANDROID_HARDWARE_CAS_V1_0_DESCRAMBLER_IMPL_H_
+#define ANDROID_HARDWARE_CAS_V1_0_DESCRAMBLER_IMPL_H_
+
+#include <media/stagefright/foundation/ABase.h>
+#include <android/hardware/cas/native/1.0/IDescrambler.h>
+
+namespace android {
+struct DescramblerPlugin;
+using namespace hardware::cas::native::V1_0;
+
+namespace hardware {
+namespace cas {
+namespace V1_0 {
+namespace implementation {
+
+class SharedLibrary;
+
+class DescramblerImpl : public IDescrambler {
+public:
+    DescramblerImpl(const sp<SharedLibrary>& library, DescramblerPlugin *plugin);
+    virtual ~DescramblerImpl();
+
+    virtual Return<Status> setMediaCasSession(
+            const HidlCasSessionId& sessionId) override;
+
+    virtual Return<bool> requiresSecureDecoderComponent(
+            const hidl_string& mime) override;
+
+    virtual Return<void> descramble(
+            ScramblingControl scramblingControl,
+            const hidl_vec<SubSample>& subSamples,
+            const SharedBuffer& srcBuffer,
+            uint64_t srcOffset,
+            const DestinationBuffer& dstBuffer,
+            uint64_t dstOffset,
+            descramble_cb _hidl_cb) override;
+
+    virtual Return<Status> release() override;
+
+private:
+    sp<SharedLibrary> mLibrary;
+    DescramblerPlugin *mPlugin;
+
+    DISALLOW_EVIL_CONSTRUCTORS(DescramblerImpl);
+};
+
+} // namespace implementation
+} // namespace V1_0
+} // namespace cas
+} // namespace hardware
+} // namespace android
+
+#endif // ANDROID_HARDWARE_CAS_V1_0_DESCRAMBLER_IMPL_H_