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diff --git a/media/libstagefright/include/MPEG4Extractor.h b/media/libstagefright/include/MPEG4Extractor.h
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+++ b/media/libstagefright/include/MPEG4Extractor.h
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+/*
+ * Copyright (C) 2009 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 MPEG4_EXTRACTOR_H_
+
+#define MPEG4_EXTRACTOR_H_
+
+#include <media/stagefright/MediaExtractor.h>
+#include <utils/Vector.h>
+#include <utils/String8.h>
+
+namespace android {
+
+struct AMessage;
+class DataSource;
+class SampleTable;
+class String8;
+
+class MPEG4Extractor : public MediaExtractor {
+public:
+    // Extractor assumes ownership of "source".
+    MPEG4Extractor(const sp<DataSource> &source);
+
+    virtual size_t countTracks();
+    virtual sp<MediaSource> getTrack(size_t index);
+    virtual sp<MetaData> getTrackMetaData(size_t index, uint32_t flags);
+
+    virtual sp<MetaData> getMetaData();
+
+    // for DRM
+    virtual char* getDrmTrackInfo(size_t trackID, int *len);
+
+protected:
+    virtual ~MPEG4Extractor();
+
+private:
+    struct Track {
+        Track *next;
+        sp<MetaData> meta;
+        uint32_t timescale;
+        sp<SampleTable> sampleTable;
+        bool includes_expensive_metadata;
+        bool skipTrack;
+    };
+
+    sp<DataSource> mDataSource;
+    status_t mInitCheck;
+    bool mHasVideo;
+
+    Track *mFirstTrack, *mLastTrack;
+
+    sp<MetaData> mFileMetaData;
+
+    Vector<uint32_t> mPath;
+    String8 mLastCommentMean;
+    String8 mLastCommentName;
+    String8 mLastCommentData;
+
+    status_t readMetaData();
+    status_t parseChunk(off64_t *offset, int depth);
+    status_t parseMetaData(off64_t offset, size_t size);
+
+    status_t updateAudioTrackInfoFromESDS_MPEG4Audio(
+            const void *esds_data, size_t esds_size);
+
+    static status_t verifyTrack(Track *track);
+
+    struct SINF {
+        SINF *next;
+        uint16_t trackID;
+        uint8_t IPMPDescriptorID;
+        ssize_t len;
+        char *IPMPData;
+    };
+
+    SINF *mFirstSINF;
+
+    bool mIsDrm;
+    status_t parseDrmSINF(off64_t *offset, off64_t data_offset);
+
+    status_t parseTrackHeader(off64_t data_offset, off64_t data_size);
+
+    Track *findTrackByMimePrefix(const char *mimePrefix);
+
+    MPEG4Extractor(const MPEG4Extractor &);
+    MPEG4Extractor &operator=(const MPEG4Extractor &);
+};
+
+bool SniffMPEG4(
+        const sp<DataSource> &source, String8 *mimeType, float *confidence,
+        sp<AMessage> *);
+
+}  // namespace android
+
+#endif  // MPEG4_EXTRACTOR_H_