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116 lines
3.5 KiB
116 lines
3.5 KiB
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//#define LOG_NDEBUG 0
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#define LOG_TAG "HTTPBase"
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#include <utils/Log.h>
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#include <datasource/HTTPBase.h>
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#include <media/stagefright/foundation/ADebug.h>
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#include <media/stagefright/foundation/ALooper.h>
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#include <cutils/properties.h>
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#include <cutils/qtaguid.h>
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namespace android {
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HTTPBase::HTTPBase()
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: mNumBandwidthHistoryItems(0),
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mTotalTransferTimeUs(0),
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mTotalTransferBytes(0),
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mMaxBandwidthHistoryItems(100),
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mPrevBandwidthMeasureTimeUs(0),
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mPrevEstimatedBandWidthKbps(0),
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mBandWidthCollectFreqMs(5000) {
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mName = String8("HTTPBase(<disconnected>)");
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}
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void HTTPBase::addBandwidthMeasurement(
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size_t numBytes, int64_t delayUs) {
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Mutex::Autolock autoLock(mLock);
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BandwidthEntry entry;
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entry.mDelayUs = delayUs;
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entry.mNumBytes = numBytes;
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mTotalTransferTimeUs += delayUs;
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mTotalTransferBytes += numBytes;
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mBandwidthHistory.push_back(entry);
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if (++mNumBandwidthHistoryItems > mMaxBandwidthHistoryItems) {
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BandwidthEntry *entry = &*mBandwidthHistory.begin();
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mTotalTransferTimeUs -= entry->mDelayUs;
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mTotalTransferBytes -= entry->mNumBytes;
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mBandwidthHistory.erase(mBandwidthHistory.begin());
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--mNumBandwidthHistoryItems;
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int64_t timeNowUs = ALooper::GetNowUs();
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if (timeNowUs - mPrevBandwidthMeasureTimeUs >=
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mBandWidthCollectFreqMs * 1000LL) {
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if (mPrevBandwidthMeasureTimeUs != 0) {
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mPrevEstimatedBandWidthKbps =
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(mTotalTransferBytes * 8E3 / mTotalTransferTimeUs);
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}
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mPrevBandwidthMeasureTimeUs = timeNowUs;
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}
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}
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}
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bool HTTPBase::estimateBandwidth(int32_t *bandwidth_bps) {
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Mutex::Autolock autoLock(mLock);
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// Do not do bandwidth estimation if we don't have enough samples, or
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// total bytes download are too small (<64K).
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// Bandwidth estimation from these samples can often shoot up and cause
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// unwanted bw adaption behaviors.
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if (mNumBandwidthHistoryItems < 2 || mTotalTransferBytes < 65536) {
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return false;
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}
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*bandwidth_bps = ((double)mTotalTransferBytes * 8E6 / mTotalTransferTimeUs);
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return true;
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}
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status_t HTTPBase::getEstimatedBandwidthKbps(int32_t *kbps) {
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Mutex::Autolock autoLock(mLock);
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*kbps = mPrevEstimatedBandWidthKbps;
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return OK;
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}
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status_t HTTPBase::setBandwidthStatCollectFreq(int32_t freqMs) {
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Mutex::Autolock autoLock(mLock);
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if (freqMs < kMinBandwidthCollectFreqMs
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|| freqMs > kMaxBandwidthCollectFreqMs) {
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ALOGE("frequency (%d ms) is out of range [1000, 60000]", freqMs);
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return BAD_VALUE;
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}
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ALOGI("frequency set to %d ms", freqMs);
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mBandWidthCollectFreqMs = freqMs;
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return OK;
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}
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void HTTPBase::setBandwidthHistorySize(size_t numHistoryItems) {
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mMaxBandwidthHistoryItems = numHistoryItems;
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}
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} // namespace android
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