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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 //#define LOG_NDEBUG 0
     18 #define LOG_TAG "HTTPBase"
     19 #include <utils/Log.h>
     20 
     21 #include "include/HTTPBase.h"
     22 
     23 #include <media/stagefright/foundation/ADebug.h>
     24 #include <media/stagefright/foundation/ALooper.h>
     25 
     26 #include <cutils/properties.h>
     27 #include <cutils/qtaguid.h>
     28 
     29 #include <NetdClient.h>
     30 
     31 namespace android {
     32 
     33 HTTPBase::HTTPBase()
     34     : mNumBandwidthHistoryItems(0),
     35       mTotalTransferTimeUs(0),
     36       mTotalTransferBytes(0),
     37       mMaxBandwidthHistoryItems(100),
     38       mPrevBandwidthMeasureTimeUs(0),
     39       mPrevEstimatedBandWidthKbps(0),
     40       mBandWidthCollectFreqMs(5000) {
     41 }
     42 
     43 void HTTPBase::addBandwidthMeasurement(
     44         size_t numBytes, int64_t delayUs) {
     45     Mutex::Autolock autoLock(mLock);
     46 
     47     BandwidthEntry entry;
     48     entry.mDelayUs = delayUs;
     49     entry.mNumBytes = numBytes;
     50     mTotalTransferTimeUs += delayUs;
     51     mTotalTransferBytes += numBytes;
     52 
     53     mBandwidthHistory.push_back(entry);
     54     if (++mNumBandwidthHistoryItems > mMaxBandwidthHistoryItems) {
     55         BandwidthEntry *entry = &*mBandwidthHistory.begin();
     56         mTotalTransferTimeUs -= entry->mDelayUs;
     57         mTotalTransferBytes -= entry->mNumBytes;
     58         mBandwidthHistory.erase(mBandwidthHistory.begin());
     59         --mNumBandwidthHistoryItems;
     60 
     61         int64_t timeNowUs = ALooper::GetNowUs();
     62         if (timeNowUs - mPrevBandwidthMeasureTimeUs >=
     63                 mBandWidthCollectFreqMs * 1000LL) {
     64 
     65             if (mPrevBandwidthMeasureTimeUs != 0) {
     66                 mPrevEstimatedBandWidthKbps =
     67                     (mTotalTransferBytes * 8E3 / mTotalTransferTimeUs);
     68             }
     69             mPrevBandwidthMeasureTimeUs = timeNowUs;
     70         }
     71     }
     72 
     73 }
     74 
     75 bool HTTPBase::estimateBandwidth(int32_t *bandwidth_bps) {
     76     Mutex::Autolock autoLock(mLock);
     77 
     78     // Do not do bandwidth estimation if we don't have enough samples, or
     79     // total bytes download are too small (<64K).
     80     // Bandwidth estimation from these samples can often shoot up and cause
     81     // unwanted bw adaption behaviors.
     82     if (mNumBandwidthHistoryItems < 2 || mTotalTransferBytes < 65536) {
     83         return false;
     84     }
     85 
     86     *bandwidth_bps = ((double)mTotalTransferBytes * 8E6 / mTotalTransferTimeUs);
     87 
     88     return true;
     89 }
     90 
     91 status_t HTTPBase::getEstimatedBandwidthKbps(int32_t *kbps) {
     92     Mutex::Autolock autoLock(mLock);
     93     *kbps = mPrevEstimatedBandWidthKbps;
     94     return OK;
     95 }
     96 
     97 status_t HTTPBase::setBandwidthStatCollectFreq(int32_t freqMs) {
     98     Mutex::Autolock autoLock(mLock);
     99 
    100     if (freqMs < kMinBandwidthCollectFreqMs
    101             || freqMs > kMaxBandwidthCollectFreqMs) {
    102 
    103         ALOGE("frequency (%d ms) is out of range [1000, 60000]", freqMs);
    104         return BAD_VALUE;
    105     }
    106 
    107     ALOGI("frequency set to %d ms", freqMs);
    108     mBandWidthCollectFreqMs = freqMs;
    109     return OK;
    110 }
    111 
    112 void HTTPBase::setBandwidthHistorySize(size_t numHistoryItems) {
    113     mMaxBandwidthHistoryItems = numHistoryItems;
    114 }
    115 
    116 // static
    117 void HTTPBase::RegisterSocketUserTag(int sockfd, uid_t uid, uint32_t kTag) {
    118     int res = qtaguid_tagSocket(sockfd, kTag, uid);
    119     if (res != 0) {
    120         ALOGE("Failed tagging socket %d for uid %d (My UID=%d)", sockfd, uid, geteuid());
    121     }
    122 }
    123 
    124 // static
    125 void HTTPBase::UnRegisterSocketUserTag(int sockfd) {
    126     int res = qtaguid_untagSocket(sockfd);
    127     if (res != 0) {
    128         ALOGE("Failed untagging socket %d (My UID=%d)", sockfd, geteuid());
    129     }
    130 }
    131 
    132 // static
    133 void HTTPBase::RegisterSocketUserMark(int sockfd, uid_t uid) {
    134     setNetworkForUser(uid, sockfd);
    135 }
    136 
    137 // static
    138 void HTTPBase::UnRegisterSocketUserMark(int sockfd) {
    139     RegisterSocketUserMark(sockfd, geteuid());
    140 }
    141 
    142 }  // namespace android
    143