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      1 /*
      2  * Copyright (C) 2009 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef MPEG4_EXTRACTOR_H_
     18 
     19 #define MPEG4_EXTRACTOR_H_
     20 
     21 #include <media/stagefright/MediaExtractor.h>
     22 #include <utils/Vector.h>
     23 #include <utils/String8.h>
     24 
     25 namespace android {
     26 
     27 struct AMessage;
     28 class DataSource;
     29 class SampleTable;
     30 class String8;
     31 
     32 class MPEG4Extractor : public MediaExtractor {
     33 public:
     34     // Extractor assumes ownership of "source".
     35     MPEG4Extractor(const sp<DataSource> &source);
     36 
     37     virtual size_t countTracks();
     38     virtual sp<MediaSource> getTrack(size_t index);
     39     virtual sp<MetaData> getTrackMetaData(size_t index, uint32_t flags);
     40 
     41     virtual sp<MetaData> getMetaData();
     42 
     43     // for DRM
     44     virtual char* getDrmTrackInfo(size_t trackID, int *len);
     45 
     46 protected:
     47     virtual ~MPEG4Extractor();
     48 
     49 private:
     50     struct Track {
     51         Track *next;
     52         sp<MetaData> meta;
     53         uint32_t timescale;
     54         sp<SampleTable> sampleTable;
     55         bool includes_expensive_metadata;
     56         bool skipTrack;
     57     };
     58 
     59     sp<DataSource> mDataSource;
     60     status_t mInitCheck;
     61     bool mHasVideo;
     62 
     63     Track *mFirstTrack, *mLastTrack;
     64 
     65     sp<MetaData> mFileMetaData;
     66 
     67     Vector<uint32_t> mPath;
     68     String8 mLastCommentMean;
     69     String8 mLastCommentName;
     70     String8 mLastCommentData;
     71 
     72     status_t readMetaData();
     73     status_t parseChunk(off64_t *offset, int depth);
     74     status_t parseMetaData(off64_t offset, size_t size);
     75 
     76     status_t updateAudioTrackInfoFromESDS_MPEG4Audio(
     77             const void *esds_data, size_t esds_size);
     78 
     79     static status_t verifyTrack(Track *track);
     80 
     81     struct SINF {
     82         SINF *next;
     83         uint16_t trackID;
     84         uint8_t IPMPDescriptorID;
     85         ssize_t len;
     86         char *IPMPData;
     87     };
     88 
     89     SINF *mFirstSINF;
     90 
     91     bool mIsDrm;
     92     status_t parseDrmSINF(off64_t *offset, off64_t data_offset);
     93 
     94     status_t parseTrackHeader(off64_t data_offset, off64_t data_size);
     95 
     96     Track *findTrackByMimePrefix(const char *mimePrefix);
     97 
     98     MPEG4Extractor(const MPEG4Extractor &);
     99     MPEG4Extractor &operator=(const MPEG4Extractor &);
    100 };
    101 
    102 bool SniffMPEG4(
    103         const sp<DataSource> &source, String8 *mimeType, float *confidence,
    104         sp<AMessage> *);
    105 
    106 }  // namespace android
    107 
    108 #endif  // MPEG4_EXTRACTOR_H_
    109