/*
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* Copyright (C) 2010 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_TAG "Sensors"
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#include <sensor/SensorEventQueue.h>
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#include <algorithm>
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#include <sys/socket.h>
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#include <utils/RefBase.h>
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#include <utils/Looper.h>
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#include <sensor/Sensor.h>
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#include <sensor/BitTube.h>
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#include <sensor/ISensorEventConnection.h>
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#include <android/sensor.h>
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#include <hardware/sensors-base.h>
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using std::min;
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// ----------------------------------------------------------------------------
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namespace android {
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// ----------------------------------------------------------------------------
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SensorEventQueue::SensorEventQueue(const sp<ISensorEventConnection>& connection)
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: mSensorEventConnection(connection), mRecBuffer(nullptr), mAvailable(0), mConsumed(0),
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mNumAcksToSend(0) {
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mRecBuffer = new ASensorEvent[MAX_RECEIVE_BUFFER_EVENT_COUNT];
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}
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SensorEventQueue::~SensorEventQueue() {
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delete [] mRecBuffer;
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}
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void SensorEventQueue::onFirstRef()
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{
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mSensorChannel = mSensorEventConnection->getSensorChannel();
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}
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int SensorEventQueue::getFd() const
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{
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return mSensorChannel->getFd();
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}
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ssize_t SensorEventQueue::write(const sp<BitTube>& tube,
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ASensorEvent const* events, size_t numEvents) {
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return BitTube::sendObjects(tube, events, numEvents);
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}
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ssize_t SensorEventQueue::read(ASensorEvent* events, size_t numEvents) {
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if (mAvailable == 0) {
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ssize_t err = BitTube::recvObjects(mSensorChannel,
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mRecBuffer, MAX_RECEIVE_BUFFER_EVENT_COUNT);
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if (err < 0) {
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return err;
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}
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mAvailable = static_cast<size_t>(err);
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mConsumed = 0;
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}
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size_t count = min(numEvents, mAvailable);
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memcpy(events, mRecBuffer + mConsumed, count * sizeof(ASensorEvent));
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mAvailable -= count;
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mConsumed += count;
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return static_cast<ssize_t>(count);
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}
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sp<Looper> SensorEventQueue::getLooper() const
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{
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Mutex::Autolock _l(mLock);
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if (mLooper == nullptr) {
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mLooper = new Looper(true);
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mLooper->addFd(getFd(), getFd(), ALOOPER_EVENT_INPUT, nullptr, nullptr);
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}
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return mLooper;
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}
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status_t SensorEventQueue::waitForEvent() const
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{
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const int fd = getFd();
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sp<Looper> looper(getLooper());
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int events;
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int32_t result;
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do {
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result = looper->pollOnce(-1, nullptr, &events, nullptr);
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if (result == ALOOPER_POLL_ERROR) {
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ALOGE("SensorEventQueue::waitForEvent error (errno=%d)", errno);
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result = -EPIPE; // unknown error, so we make up one
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break;
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}
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if (events & ALOOPER_EVENT_HANGUP) {
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// the other-side has died
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ALOGE("SensorEventQueue::waitForEvent error HANGUP");
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result = -EPIPE; // unknown error, so we make up one
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break;
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}
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} while (result != fd);
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return (result == fd) ? status_t(NO_ERROR) : result;
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}
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status_t SensorEventQueue::wake() const
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{
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sp<Looper> looper(getLooper());
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looper->wake();
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return NO_ERROR;
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}
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status_t SensorEventQueue::enableSensor(Sensor const* sensor) const {
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return enableSensor(sensor, SENSOR_DELAY_NORMAL);
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}
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status_t SensorEventQueue::enableSensor(Sensor const* sensor, int32_t samplingPeriodUs) const {
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return mSensorEventConnection->enableDisable(sensor->getHandle(), true,
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us2ns(samplingPeriodUs), 0, 0);
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}
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status_t SensorEventQueue::disableSensor(Sensor const* sensor) const {
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return mSensorEventConnection->enableDisable(sensor->getHandle(), false, 0, 0, 0);
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}
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status_t SensorEventQueue::enableSensor(int32_t handle, int32_t samplingPeriodUs,
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int64_t maxBatchReportLatencyUs, int reservedFlags) const {
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return mSensorEventConnection->enableDisable(handle, true, us2ns(samplingPeriodUs),
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us2ns(maxBatchReportLatencyUs), reservedFlags);
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}
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status_t SensorEventQueue::flush() const {
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return mSensorEventConnection->flush();
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}
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status_t SensorEventQueue::disableSensor(int32_t handle) const {
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return mSensorEventConnection->enableDisable(handle, false, 0, 0, false);
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}
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status_t SensorEventQueue::setEventRate(Sensor const* sensor, nsecs_t ns) const {
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return mSensorEventConnection->setEventRate(sensor->getHandle(), ns);
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}
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status_t SensorEventQueue::injectSensorEvent(const ASensorEvent& event) {
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do {
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// Blocking call.
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ssize_t size = ::send(mSensorChannel->getFd(), &event, sizeof(event), MSG_NOSIGNAL);
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if (size >= 0) {
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return NO_ERROR;
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} else if (size < 0 && errno == EAGAIN) {
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// If send is returning a "Try again" error, sleep for 100ms and try again. In all
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// other cases log a failure and exit.
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usleep(100000);
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} else {
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ALOGE("injectSensorEvent failure %s %zd", strerror(errno), size);
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return INVALID_OPERATION;
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}
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} while (true);
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}
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void SensorEventQueue::sendAck(const ASensorEvent* events, int count) {
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for (int i = 0; i < count; ++i) {
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if (events[i].flags & WAKE_UP_SENSOR_EVENT_NEEDS_ACK) {
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++mNumAcksToSend;
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}
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}
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// Send mNumAcksToSend to acknowledge for the wake up sensor events received.
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if (mNumAcksToSend > 0) {
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ssize_t size = ::send(mSensorChannel->getFd(), &mNumAcksToSend, sizeof(mNumAcksToSend),
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MSG_DONTWAIT | MSG_NOSIGNAL);
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if (size < 0) {
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ALOGE("sendAck failure %zd %d", size, mNumAcksToSend);
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} else {
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mNumAcksToSend = 0;
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}
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}
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return;
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}
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ssize_t SensorEventQueue::filterEvents(ASensorEvent* events, size_t count) const {
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// Check if this Sensor Event Queue is registered to receive each type of event. If it is not,
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// then do not copy the event into the final buffer. Minimize the number of copy operations by
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// finding consecutive sequences of events that the Sensor Event Queue should receive and only
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// copying the events once an unregistered event type is reached.
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bool intervalStartLocSet = false;
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size_t intervalStartLoc = 0;
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size_t eventsInInterval = 0;
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ssize_t eventsCopied = 0;
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for (size_t i = 0; i < count; i++) {
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bool includeEvent =
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(events[i].type != SENSOR_TYPE_ADDITIONAL_INFO || requestAdditionalInfo);
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if (includeEvent) {
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// Do not copy events yet since there may be more consecutive events that should be
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// copied together. Track the start location and number of events in the current
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// sequence.
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if (!intervalStartLocSet) {
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intervalStartLoc = i;
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intervalStartLocSet = true;
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eventsInInterval = 0;
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}
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eventsInInterval++;
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}
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// Shift the events from the already processed interval once an event that should not be
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// included is reached or if this is the final event to be processed.
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if (!includeEvent || (i + 1 == count)) {
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// Only shift the events if the interval did not start with the first event. If the
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// interval started with the first event, the events are already in their correct
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// location.
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if (intervalStartLoc > 0) {
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memmove(&events[eventsCopied], &events[intervalStartLoc],
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eventsInInterval * sizeof(ASensorEvent));
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}
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eventsCopied += eventsInInterval;
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// Reset the interval information
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eventsInInterval = 0;
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intervalStartLocSet = false;
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}
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}
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return eventsCopied;
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}
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// ----------------------------------------------------------------------------
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}; // namespace android
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