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
HTTPBase()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
addBandwidthMeasurement(size_t numBytes,int64_t delayUs)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
estimateBandwidth(int32_t * bandwidth_bps)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
getEstimatedBandwidthKbps(int32_t * kbps)91 status_t HTTPBase::getEstimatedBandwidthKbps(int32_t *kbps) {
92 Mutex::Autolock autoLock(mLock);
93 *kbps = mPrevEstimatedBandWidthKbps;
94 return OK;
95 }
96
setBandwidthStatCollectFreq(int32_t freqMs)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
setBandwidthHistorySize(size_t numHistoryItems)112 void HTTPBase::setBandwidthHistorySize(size_t numHistoryItems) {
113 mMaxBandwidthHistoryItems = numHistoryItems;
114 }
115
116 // static
RegisterSocketUserTag(int sockfd,uid_t uid,uint32_t kTag)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
UnRegisterSocketUserTag(int sockfd)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
RegisterSocketUserMark(int sockfd,uid_t uid)133 void HTTPBase::RegisterSocketUserMark(int sockfd, uid_t uid) {
134 setNetworkForUser(uid, sockfd);
135 }
136
137 // static
UnRegisterSocketUserMark(int sockfd)138 void HTTPBase::UnRegisterSocketUserMark(int sockfd) {
139 RegisterSocketUserMark(sockfd, geteuid());
140 }
141
142 } // namespace android
143