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      1 /*
      2  * Copyright (C) 2014 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 MIDI_EXTRACTOR_H_
     18 #define MIDI_EXTRACTOR_H_
     19 
     20 #include <media/DataSourceBase.h>
     21 #include <media/MediaExtractor.h>
     22 #include <media/stagefright/MediaBufferBase.h>
     23 #include <media/stagefright/MediaBufferGroup.h>
     24 #include <media/stagefright/MetaDataBase.h>
     25 #include <media/MidiIoWrapper.h>
     26 #include <utils/String8.h>
     27 #include <libsonivox/eas.h>
     28 
     29 namespace android {
     30 
     31 class MidiEngine {
     32 public:
     33     explicit MidiEngine(DataSourceBase *dataSource,
     34             MetaDataBase *fileMetadata,
     35             MetaDataBase *trackMetadata);
     36     ~MidiEngine();
     37 
     38     status_t initCheck();
     39 
     40     status_t allocateBuffers();
     41     status_t releaseBuffers();
     42     status_t seekTo(int64_t positionUs);
     43     MediaBufferBase* readBuffer();
     44 private:
     45     MidiIoWrapper *mIoWrapper;
     46     MediaBufferGroup *mGroup;
     47     EAS_DATA_HANDLE mEasData;
     48     EAS_HANDLE mEasHandle;
     49     const S_EAS_LIB_CONFIG* mEasConfig;
     50     bool mIsInitialized;
     51 };
     52 
     53 class MidiExtractor : public MediaExtractor {
     54 
     55 public:
     56     explicit MidiExtractor(DataSourceBase *source);
     57 
     58     virtual size_t countTracks();
     59     virtual MediaTrack *getTrack(size_t index);
     60     virtual status_t getTrackMetaData(MetaDataBase& meta, size_t index, uint32_t flags);
     61 
     62     virtual status_t getMetaData(MetaDataBase& meta);
     63     virtual const char * name() { return "MidiExtractor"; }
     64 
     65 protected:
     66     virtual ~MidiExtractor();
     67 
     68 private:
     69     DataSourceBase *mDataSource;
     70     status_t mInitCheck;
     71     MetaDataBase mFileMetadata;
     72 
     73     // There is only one track
     74     MetaDataBase mTrackMetadata;
     75 
     76     MidiEngine *mEngine;
     77 
     78     EAS_DATA_HANDLE     mEasData;
     79     EAS_HANDLE          mEasHandle;
     80     EAS_PCM*            mAudioBuffer;
     81     EAS_I32             mPlayTime;
     82     EAS_I32             mDuration;
     83     EAS_STATE           mState;
     84     EAS_FILE            mFileLocator;
     85 
     86     MidiExtractor(const MidiExtractor &);
     87     MidiExtractor &operator=(const MidiExtractor &);
     88 
     89 };
     90 
     91 bool SniffMidi(DataSourceBase *source, float *confidence);
     92 
     93 }  // namespace android
     94 
     95 #endif  // MIDI_EXTRACTOR_H_
     96