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diff --git a/media/libstagefright/rtsp/AMPEG4ElementaryAssembler.h b/media/libstagefright/rtsp/AMPEG4ElementaryAssembler.h
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+++ b/media/libstagefright/rtsp/AMPEG4ElementaryAssembler.h
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2010 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 A_MPEG4_ELEM_ASSEMBLER_H_
+
+#define A_MPEG4_ELEM_ASSEMBLER_H_
+
+#include "ARTPAssembler.h"
+
+#include <media/stagefright/foundation/AString.h>
+
+#include <utils/List.h>
+#include <utils/RefBase.h>
+
+namespace android {
+
+struct ABuffer;
+struct AMessage;
+
+struct AMPEG4ElementaryAssembler : public ARTPAssembler {
+    AMPEG4ElementaryAssembler(
+            const sp<AMessage> &notify, const AString &desc,
+            const AString &params);
+
+protected:
+    virtual ~AMPEG4ElementaryAssembler();
+
+    virtual AssemblyStatus assembleMore(const sp<ARTPSource> &source);
+    virtual void onByeReceived();
+    virtual void packetLost();
+
+private:
+    sp<AMessage> mNotifyMsg;
+    bool mIsGeneric;
+    AString mParams;
+
+    unsigned mSizeLength;
+    unsigned mIndexLength;
+    unsigned mIndexDeltaLength;
+    unsigned mCTSDeltaLength;
+    unsigned mDTSDeltaLength;
+    bool mRandomAccessIndication;
+    unsigned mStreamStateIndication;
+    unsigned mAuxiliaryDataSizeLength;
+    bool mHasAUHeader;
+
+    uint32_t mAccessUnitRTPTime;
+    bool mNextExpectedSeqNoValid;
+    uint32_t mNextExpectedSeqNo;
+    bool mAccessUnitDamaged;
+    List<sp<ABuffer> > mPackets;
+
+    AssemblyStatus addPacket(const sp<ARTPSource> &source);
+    void submitAccessUnit();
+
+    DISALLOW_EVIL_CONSTRUCTORS(AMPEG4ElementaryAssembler);
+};
+
+}  // namespace android
+
+#endif  // A_MPEG4_ELEM_ASSEMBLER_H_