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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 <arpa/inet.h>
     22 
     23 #include <media/stagefright/DataSource.h>
     24 #include <media/stagefright/MediaExtractor.h>
     25 #include <media/stagefright/Utils.h>
     26 #include <utils/List.h>
     27 #include <utils/Vector.h>
     28 #include <utils/String8.h>
     29 
     30 namespace android {
     31 struct AMessage;
     32 class DataSource;
     33 class SampleTable;
     34 class String8;
     35 namespace heif {
     36 class ItemTable;
     37 }
     38 using heif::ItemTable;
     39 
     40 struct SidxEntry {
     41     size_t mSize;
     42     uint32_t mDurationUs;
     43 };
     44 
     45 struct Trex {
     46     uint32_t track_ID;
     47     uint32_t default_sample_description_index;
     48     uint32_t default_sample_duration;
     49     uint32_t default_sample_size;
     50     uint32_t default_sample_flags;
     51 };
     52 
     53 class MPEG4Extractor : public MediaExtractor {
     54 public:
     55     // Extractor assumes ownership of "source".
     56     explicit MPEG4Extractor(const sp<DataSource> &source);
     57 
     58     virtual size_t countTracks();
     59     virtual sp<IMediaSource> getTrack(size_t index);
     60     virtual sp<MetaData> getTrackMetaData(size_t index, uint32_t flags);
     61 
     62     virtual sp<MetaData> getMetaData();
     63     virtual uint32_t flags() const;
     64     virtual const char * name() { return "MPEG4Extractor"; }
     65     virtual void release();
     66 
     67     // for DRM
     68     virtual char* getDrmTrackInfo(size_t trackID, int *len);
     69 
     70 protected:
     71     virtual ~MPEG4Extractor();
     72 
     73     virtual void populateMetrics();
     74 
     75 private:
     76 
     77     struct PsshInfo {
     78         uint8_t uuid[16];
     79         uint32_t datalen;
     80         uint8_t *data;
     81     };
     82     struct Track {
     83         Track *next;
     84         sp<MetaData> meta;
     85         uint32_t timescale;
     86         sp<SampleTable> sampleTable;
     87         bool includes_expensive_metadata;
     88         bool skipTrack;
     89     };
     90 
     91     Vector<SidxEntry> mSidxEntries;
     92     off64_t mMoofOffset;
     93     bool mMoofFound;
     94     bool mMdatFound;
     95 
     96     Vector<PsshInfo> mPssh;
     97 
     98     Vector<Trex> mTrex;
     99 
    100     sp<DataSource> mDataSource;
    101     status_t mInitCheck;
    102     uint32_t mHeaderTimescale;
    103     bool mIsQT;
    104     bool mIsHEIF;
    105 
    106     Track *mFirstTrack, *mLastTrack;
    107 
    108     sp<MetaData> mFileMetaData;
    109 
    110     Vector<uint32_t> mPath;
    111     String8 mLastCommentMean;
    112     String8 mLastCommentName;
    113     String8 mLastCommentData;
    114 
    115     KeyedVector<uint32_t, AString> mMetaKeyMap;
    116 
    117     status_t readMetaData();
    118     status_t parseChunk(off64_t *offset, int depth);
    119     status_t parseITunesMetaData(off64_t offset, size_t size);
    120     status_t parseColorInfo(off64_t offset, size_t size);
    121     status_t parse3GPPMetaData(off64_t offset, size_t size, int depth);
    122     void parseID3v2MetaData(off64_t offset);
    123     status_t parseQTMetaKey(off64_t data_offset, size_t data_size);
    124     status_t parseQTMetaVal(int32_t keyId, off64_t data_offset, size_t data_size);
    125 
    126     status_t updateAudioTrackInfoFromESDS_MPEG4Audio(
    127             const void *esds_data, size_t esds_size);
    128 
    129     static status_t verifyTrack(Track *track);
    130 
    131     struct SINF {
    132         SINF *next;
    133         uint16_t trackID;
    134         uint8_t IPMPDescriptorID;
    135         ssize_t len;
    136         char *IPMPData;
    137     };
    138 
    139     SINF *mFirstSINF;
    140 
    141     bool mIsDrm;
    142     sp<ItemTable> mItemTable;
    143 
    144     status_t parseDrmSINF(off64_t *offset, off64_t data_offset);
    145 
    146     status_t parseTrackHeader(off64_t data_offset, off64_t data_size);
    147 
    148     status_t parseSegmentIndex(off64_t data_offset, size_t data_size);
    149 
    150     Track *findTrackByMimePrefix(const char *mimePrefix);
    151 
    152     status_t parseAC3SampleEntry(off64_t offset);
    153     status_t parseAC3SpecificBox(off64_t offset, uint16_t sampleRate);
    154 
    155     MPEG4Extractor(const MPEG4Extractor &);
    156     MPEG4Extractor &operator=(const MPEG4Extractor &);
    157 };
    158 
    159 bool SniffMPEG4(
    160         const sp<DataSource> &source, String8 *mimeType, float *confidence,
    161         sp<AMessage> *);
    162 
    163 }  // namespace android
    164 
    165 #endif  // MPEG4_EXTRACTOR_H_
    166