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      1 /*
      2  * Copyright (C) 2011 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 HTTP_BASE_H_
     18 
     19 #define HTTP_BASE_H_
     20 
     21 #include <media/stagefright/foundation/ABase.h>
     22 #include <media/stagefright/DataSource.h>
     23 #include <media/stagefright/MediaErrors.h>
     24 #include <utils/threads.h>
     25 
     26 namespace android {
     27 
     28 struct HTTPBase : public DataSource {
     29     enum Flags {
     30         // Don't log any URLs.
     31         kFlagIncognito = 1
     32     };
     33 
     34     HTTPBase();
     35 
     36     virtual status_t connect(
     37             const char *uri,
     38             const KeyedVector<String8, String8> *headers = NULL,
     39             off64_t offset = 0) = 0;
     40 
     41     virtual void disconnect() = 0;
     42 
     43     // Returns true if bandwidth could successfully be estimated,
     44     // false otherwise.
     45     virtual bool estimateBandwidth(int32_t *bandwidth_bps);
     46 
     47     virtual status_t getEstimatedBandwidthKbps(int32_t *kbps);
     48 
     49     virtual status_t setBandwidthStatCollectFreq(int32_t freqMs);
     50 
     51     virtual void setBandwidthHistorySize(size_t numHistoryItems);
     52 
     53     static void RegisterSocketUserTag(int sockfd, uid_t uid, uint32_t kTag);
     54     static void UnRegisterSocketUserTag(int sockfd);
     55 
     56     static void RegisterSocketUserMark(int sockfd, uid_t uid);
     57     static void UnRegisterSocketUserMark(int sockfd);
     58 
     59 protected:
     60     virtual void addBandwidthMeasurement(size_t numBytes, int64_t delayUs);
     61 
     62 private:
     63     struct BandwidthEntry {
     64         int64_t mDelayUs;
     65         size_t mNumBytes;
     66     };
     67 
     68     Mutex mLock;
     69 
     70     List<BandwidthEntry> mBandwidthHistory;
     71     size_t mNumBandwidthHistoryItems;
     72     int64_t mTotalTransferTimeUs;
     73     size_t mTotalTransferBytes;
     74     size_t mMaxBandwidthHistoryItems;
     75 
     76     enum {
     77         kMinBandwidthCollectFreqMs = 1000,   // 1 second
     78         kMaxBandwidthCollectFreqMs = 60000,  // one minute
     79     };
     80 
     81     int64_t mPrevBandwidthMeasureTimeUs;
     82     int32_t mPrevEstimatedBandWidthKbps;
     83     int32_t mBandWidthCollectFreqMs;
     84 
     85     DISALLOW_EVIL_CONSTRUCTORS(HTTPBase);
     86 };
     87 
     88 }  // namespace android
     89 
     90 #endif  // HTTP_BASE_H_
     91