Home | History | Annotate | Download | only in include 
      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 
     24 namespace android {
     25 
     26 struct AMessage;
     27 class DataSource;
     28 class SampleTable;
     29 class String8;
     30 
     31 class MPEG4Extractor : public MediaExtractor {
     32 public:
     33     // Extractor assumes ownership of "source".
     34     MPEG4Extractor(const sp<DataSource> &source);
     35 
     36     virtual size_t countTracks();
     37     virtual sp<MediaSource> getTrack(size_t index);
     38     virtual sp<MetaData> getTrackMetaData(size_t index, uint32_t flags);
     39 
     40     virtual sp<MetaData> getMetaData();
     41 
     42 protected:
     43     virtual ~MPEG4Extractor();
     44 
     45 private:
     46     struct Track {
     47         Track *next;
     48         sp<MetaData> meta;
     49         uint32_t timescale;
     50         sp<SampleTable> sampleTable;
     51         bool includes_expensive_metadata;
     52         bool skipTrack;
     53     };
     54 
     55     sp<DataSource> mDataSource;
     56     bool mHaveMetadata;
     57     bool mHasVideo;
     58 
     59     Track *mFirstTrack, *mLastTrack;
     60 
     61     sp<MetaData> mFileMetaData;
     62 
     63     Vector<uint32_t> mPath;
     64 
     65     status_t readMetaData();
     66     status_t parseChunk(off_t *offset, int depth);
     67     status_t parseMetaData(off_t offset, size_t size);
     68 
     69     status_t updateAudioTrackInfoFromESDS_MPEG4Audio(
     70             const void *esds_data, size_t esds_size);
     71 
     72     static status_t verifyTrack(Track *track);
     73 
     74     status_t parseTrackHeader(off_t data_offset, off_t data_size);
     75 
     76     MPEG4Extractor(const MPEG4Extractor &);
     77     MPEG4Extractor &operator=(const MPEG4Extractor &);
     78 };
     79 
     80 bool SniffMPEG4(
     81         const sp<DataSource> &source, String8 *mimeType, float *confidence,
     82         sp<AMessage> *);
     83 
     84 }  // namespace android
     85 
     86 #endif  // MPEG4_EXTRACTOR_H_
     87