diff --git a/drm/libmediadrm/MediaCasDefs.cpp b/drm/libmediadrm/MediaCasDefs.cpp
new file mode 100644
index 0000000..9c2ba38
--- /dev/null
+++ b/drm/libmediadrm/MediaCasDefs.cpp
@@ -0,0 +1,184 @@
+/*
+ * 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.
+ */
+//#define LOG_NDEBUG 0
+#define LOG_TAG "MediaCas"
+
+#include <media/MediaCasDefs.h>
+#include <utils/Log.h>
+#include <binder/IMemory.h>
+
+namespace android {
+namespace media {
+
+///////////////////////////////////////////////////////////////////////////////
+namespace MediaCas {
+
+status_t ParcelableCasData::readFromParcel(const Parcel* parcel) {
+    return parcel->readByteVector(this);
+}
+
+status_t ParcelableCasData::writeToParcel(Parcel* parcel) const  {
+    return parcel->writeByteVector(*this);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+status_t ParcelableCasPluginDescriptor::readFromParcel(const Parcel* /*parcel*/) {
+    ALOGE("CAPluginDescriptor::readFromParcel() shouldn't be called");
+    return INVALID_OPERATION;
+}
+
+status_t ParcelableCasPluginDescriptor::writeToParcel(Parcel* parcel) const {
+    status_t err = parcel->writeInt32(mCASystemId);
+    if (err != NO_ERROR) {
+        return err;
+    }
+    return parcel->writeString16(mName);
+}
+
+} // namespace MediaCas
+///////////////////////////////////////////////////////////////////////////////
+
+namespace MediaDescrambler {
+
+DescrambleInfo::DescrambleInfo() {}
+
+DescrambleInfo::~DescrambleInfo() {}
+
+status_t DescrambleInfo::readFromParcel(const Parcel* parcel) {
+    status_t err = parcel->readInt32((int32_t*)&dstType);
+    if (err != OK) {
+        return err;
+    }
+    if (dstType != kDestinationTypeNativeHandle
+            && dstType != kDestinationTypeVmPointer) {
+        return BAD_VALUE;
+    }
+
+    err = parcel->readInt32((int32_t*)&scramblingControl);
+    if (err != OK) {
+        return err;
+    }
+
+    err = parcel->readUint32((uint32_t*)&numSubSamples);
+    if (err != OK) {
+        return err;
+    }
+    if (numSubSamples > 0xffff) {
+        return BAD_VALUE;
+    }
+
+    subSamples = new DescramblerPlugin::SubSample[numSubSamples];
+    if (subSamples == NULL) {
+        return NO_MEMORY;
+    }
+
+    for (size_t i = 0; i < numSubSamples; i++) {
+        err = parcel->readUint32(&subSamples[i].mNumBytesOfClearData);
+        if (err != OK) {
+            return err;
+        }
+        err = parcel->readUint32(&subSamples[i].mNumBytesOfEncryptedData);
+        if (err != OK) {
+            return err;
+        }
+    }
+
+    srcMem = interface_cast<IMemory>(parcel->readStrongBinder());
+    if (srcMem == NULL) {
+        return BAD_VALUE;
+    }
+
+    err = parcel->readInt32(&srcOffset);
+    if (err != OK) {
+        return err;
+    }
+
+    native_handle_t *nativeHandle = NULL;
+    if (dstType == kDestinationTypeNativeHandle) {
+        nativeHandle = parcel->readNativeHandle();
+        dstPtr = static_cast<void *>(nativeHandle);
+    } else {
+        dstPtr = NULL;
+    }
+
+    err = parcel->readInt32(&dstOffset);
+    if (err != OK) {
+        return err;
+    }
+
+    return OK;
+}
+
+status_t DescrambleInfo::writeToParcel(Parcel* parcel) const {
+    if (dstType != kDestinationTypeNativeHandle
+            && dstType != kDestinationTypeVmPointer) {
+        return BAD_VALUE;
+    }
+
+    status_t err = parcel->writeInt32((int32_t)dstType);
+    if (err != OK) {
+        return err;
+    }
+
+    err = parcel->writeInt32(scramblingControl);
+    if (err != OK) {
+        return err;
+    }
+
+    err = parcel->writeUint32(numSubSamples);
+    if (err != OK) {
+        return err;
+    }
+
+    for (size_t i = 0; i < numSubSamples; i++) {
+        err = parcel->writeUint32(subSamples[i].mNumBytesOfClearData);
+        if (err != OK) {
+            return err;
+        }
+        err = parcel->writeUint32(subSamples[i].mNumBytesOfEncryptedData);
+        if (err != OK) {
+            return err;
+        }
+    }
+
+    err = parcel->writeStrongBinder(IInterface::asBinder(srcMem));
+    if (err != OK) {
+        return err;
+    }
+
+    err = parcel->writeInt32(srcOffset);
+    if (err != OK) {
+        return err;
+    }
+
+    if (dstType == kDestinationTypeNativeHandle) {
+        parcel->writeNativeHandle(static_cast<native_handle_t *>(dstPtr));
+    }
+
+    err = parcel->writeInt32(dstOffset);
+    if (err != OK) {
+        return err;
+    }
+
+    return OK;
+}
+
+} // namespace MediaDescrambler
+
+} // namespace media
+} // namespace android
+