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
31namespace android {
32
33HTTPBase::HTTPBase()
34    : mNumBandwidthHistoryItems(0),
35      mTotalTransferTimeUs(0),
36      mTotalTransferBytes(0),
37      mMaxBandwidthHistoryItems(100),
38      mPrevBandwidthMeasureTimeUs(0),
39      mPrevEstimatedBandWidthKbps(0),
40      mBandWidthCollectFreqMs(5000) {
41}
42
43void 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
75bool 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
91status_t HTTPBase::getEstimatedBandwidthKbps(int32_t *kbps) {
92    Mutex::Autolock autoLock(mLock);
93    *kbps = mPrevEstimatedBandWidthKbps;
94    return OK;
95}
96
97status_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
112void HTTPBase::setBandwidthHistorySize(size_t numHistoryItems) {
113    mMaxBandwidthHistoryItems = numHistoryItems;
114}
115
116// static
117void 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
125void 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
133void HTTPBase::RegisterSocketUserMark(int sockfd, uid_t uid) {
134    setNetworkForUser(uid, sockfd);
135}
136
137// static
138void HTTPBase::UnRegisterSocketUserMark(int sockfd) {
139    RegisterSocketUserMark(sockfd, geteuid());
140}
141
142}  // namespace android
143