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      1 /*
      2  * Copyright 2015, 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 _ANDROID_MEDIA_MEDIADATASOURCE_H_
     18 #define _ANDROID_MEDIA_MEDIADATASOURCE_H_
     19 
     20 #include "jni.h"
     21 
     22 #include <media/IDataSource.h>
     23 #include <media/stagefright/foundation/ABase.h>
     24 #include <utils/Errors.h>
     25 #include <utils/Mutex.h>
     26 
     27 namespace android {
     28 
     29 // The native counterpart to a Java android.media.MediaDataSource. It inherits from
     30 // IDataSource so that it can be accessed remotely.
     31 //
     32 // If the java DataSource returns an error or throws an exception it
     33 // will be considered to be in a broken state, and the only further call this
     34 // will make is to close().
     35 class JMediaDataSource : public BnDataSource {
     36 public:
     37     enum {
     38         kBufferSize = 64 * 1024,
     39     };
     40 
     41     JMediaDataSource(JNIEnv *env, jobject source);
     42     virtual ~JMediaDataSource();
     43 
     44     virtual sp<IMemory> getIMemory();
     45     virtual ssize_t readAt(off64_t offset, size_t size);
     46     virtual status_t getSize(off64_t* size);
     47     virtual void close();
     48     virtual uint32_t getFlags();
     49     virtual String8 toString();
     50     virtual sp<DecryptHandle> DrmInitialization(const char *mime);
     51 
     52 private:
     53     // Protect all member variables with mLock because this object will be
     54     // accessed on different binder worker threads.
     55     Mutex mLock;
     56 
     57     // The status of the java DataSource. Set to OK unless an error occurred or
     58     // close() was called.
     59     status_t mJavaObjStatus;
     60     // Only call the java getSize() once so the app can't change the size on us.
     61     bool mSizeIsCached;
     62     off64_t mCachedSize;
     63     sp<IMemory> mMemory;
     64 
     65     jobject mMediaDataSourceObj;
     66     jmethodID mReadMethod;
     67     jmethodID mGetSizeMethod;
     68     jmethodID mCloseMethod;
     69     jbyteArray mByteArrayObj;
     70 
     71     DISALLOW_EVIL_CONSTRUCTORS(JMediaDataSource);
     72 };
     73 
     74 }  // namespace android
     75 
     76 #endif  // _ANDROID_MEDIA_MEDIADATASOURCE_H_
     77