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      1 /*
      2  * Copyright (C) 2010 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 THROTTLED_SOURCE_H_
     18 
     19 #define THROTTLED_SOURCE_H_
     20 
     21 #include <media/stagefright/DataSource.h>
     22 #include <utils/threads.h>
     23 
     24 namespace android {
     25 
     26 struct ThrottledSource : public DataSource {
     27     ThrottledSource(
     28             const sp<DataSource> &source,
     29             int32_t bandwidthLimitBytesPerSecond);
     30 
     31     // implementation of readAt() that sleeps to achieve the desired max throughput
     32     virtual ssize_t readAt(off64_t offset, void *data, size_t size);
     33 
     34     // returns an empty string to prevent callers from using the Uri to construct a new datasource
     35     virtual String8 getUri() {
     36         return String8();
     37     }
     38 
     39     // following methods all call through to the wrapped DataSource's methods
     40 
     41     status_t initCheck() const {
     42         return mSource->initCheck();
     43     }
     44 
     45     virtual status_t getSize(off64_t *size) {
     46         return mSource->getSize(size);
     47     }
     48 
     49     virtual uint32_t flags() {
     50         return mSource->flags();
     51     }
     52 
     53     virtual status_t reconnectAtOffset(off64_t offset) {
     54         return mSource->reconnectAtOffset(offset);
     55     }
     56 
     57     virtual sp<DecryptHandle> DrmInitialization(const char *mime = NULL) {
     58         return mSource->DrmInitialization(mime);
     59     }
     60 
     61     virtual void getDrmInfo(sp<DecryptHandle> &handle, DrmManagerClient **client) {
     62         mSource->getDrmInfo(handle, client);
     63     };
     64 
     65     virtual String8 getMIMEType() const {
     66         return mSource->getMIMEType();
     67     }
     68 
     69 private:
     70     Mutex mLock;
     71 
     72     sp<DataSource> mSource;
     73     int32_t mBandwidthLimitBytesPerSecond;
     74     int64_t mStartTimeUs;
     75     size_t mTotalTransferred;
     76 
     77     ThrottledSource(const ThrottledSource &);
     78     ThrottledSource &operator=(const ThrottledSource &);
     79 };
     80 
     81 }  // namespace android
     82 
     83 #endif  // THROTTLED_SOURCE_H_
     84