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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "DisplayEventDispatcher"
#include <cinttypes>
#include <cstdint>
#include <gui/DisplayEventDispatcher.h>
#include <gui/DisplayEventReceiver.h>
#include <utils/Log.h>
#include <utils/Looper.h>
#include <utils/Timers.h>
namespace android {
// Number of events to read at a time from the DisplayEventDispatcher pipe.
// The value should be large enough that we can quickly drain the pipe
// using just a few large reads.
static const size_t EVENT_BUFFER_SIZE = 100;
static constexpr nsecs_t WAITING_FOR_VSYNC_TIMEOUT = ms2ns(300);
DisplayEventDispatcher::DisplayEventDispatcher(const sp<Looper>& looper,
gui::ISurfaceComposer::VsyncSource vsyncSource,
EventRegistrationFlags eventRegistration,
const sp<IBinder>& layerHandle)
: mLooper(looper),
mReceiver(vsyncSource, eventRegistration, layerHandle),
mWaitingForVsync(false),
mLastVsyncCount(0),
mLastScheduleVsyncTime(0) {
ALOGV("dispatcher %p ~ Initializing display event dispatcher.", this);
}
status_t DisplayEventDispatcher::initialize() {
status_t result = mReceiver.initCheck();
if (result) {
ALOGW("Failed to initialize display event receiver, status=%d", result);
return result;
}
if (mLooper != nullptr) {
int rc = mLooper->addFd(mReceiver.getFd(), 0, Looper::EVENT_INPUT, this, NULL);
if (rc < 0) {
return UNKNOWN_ERROR;
}
}
return OK;
}
void DisplayEventDispatcher::dispose() {
ALOGV("dispatcher %p ~ Disposing display event dispatcher.", this);
if (!mReceiver.initCheck() && mLooper != nullptr) {
mLooper->removeFd(mReceiver.getFd());
}
}
status_t DisplayEventDispatcher::scheduleVsync() {
if (!mWaitingForVsync) {
ALOGV("dispatcher %p ~ Scheduling vsync.", this);
// Drain all pending events.
nsecs_t vsyncTimestamp;
PhysicalDisplayId vsyncDisplayId;
uint32_t vsyncCount;
VsyncEventData vsyncEventData;
if (processPendingEvents(&vsyncTimestamp, &vsyncDisplayId, &vsyncCount, &vsyncEventData)) {
ALOGE("dispatcher %p ~ last event processed while scheduling was for %" PRId64 "", this,
ns2ms(static_cast<nsecs_t>(vsyncTimestamp)));
}
status_t status = mReceiver.requestNextVsync();
if (status) {
ALOGW("Failed to request next vsync, status=%d", status);
return status;
}
mWaitingForVsync = true;
mLastScheduleVsyncTime = systemTime(SYSTEM_TIME_MONOTONIC);
}
return OK;
}
void DisplayEventDispatcher::injectEvent(const DisplayEventReceiver::Event& event) {
mReceiver.sendEvents(&event, 1);
}
int DisplayEventDispatcher::getFd() const {
return mReceiver.getFd();
}
int DisplayEventDispatcher::handleEvent(int, int events, void*) {
if (events & (Looper::EVENT_ERROR | Looper::EVENT_HANGUP)) {
ALOGE("Display event receiver pipe was closed or an error occurred. "
"events=0x%x",
events);
return 0; // remove the callback
}
if (!(events & Looper::EVENT_INPUT)) {
ALOGW("Received spurious callback for unhandled poll event. "
"events=0x%x",
events);
return 1; // keep the callback
}
// Drain all pending events, keep the last vsync.
nsecs_t vsyncTimestamp;
PhysicalDisplayId vsyncDisplayId;
uint32_t vsyncCount;
VsyncEventData vsyncEventData;
if (processPendingEvents(&vsyncTimestamp, &vsyncDisplayId, &vsyncCount, &vsyncEventData)) {
ALOGV("dispatcher %p ~ Vsync pulse: timestamp=%" PRId64
", displayId=%s, count=%d, vsyncId=%" PRId64,
this, ns2ms(vsyncTimestamp), to_string(vsyncDisplayId).c_str(), vsyncCount,
vsyncEventData.preferredVsyncId());
mWaitingForVsync = false;
mLastVsyncCount = vsyncCount;
dispatchVsync(vsyncTimestamp, vsyncDisplayId, vsyncCount, vsyncEventData);
}
if (mWaitingForVsync) {
const nsecs_t currentTime = systemTime(SYSTEM_TIME_MONOTONIC);
const nsecs_t vsyncScheduleDelay = currentTime - mLastScheduleVsyncTime;
if (vsyncScheduleDelay > WAITING_FOR_VSYNC_TIMEOUT) {
ALOGW("Vsync time out! vsyncScheduleDelay=%" PRId64 "ms", ns2ms(vsyncScheduleDelay));
mWaitingForVsync = false;
dispatchVsync(currentTime, vsyncDisplayId /* displayId is not used */,
++mLastVsyncCount, vsyncEventData /* empty data */);
}
}
return 1; // keep the callback
}
bool DisplayEventDispatcher::processPendingEvents(nsecs_t* outTimestamp,
PhysicalDisplayId* outDisplayId,
uint32_t* outCount,
VsyncEventData* outVsyncEventData) {
bool gotVsync = false;
DisplayEventReceiver::Event buf[EVENT_BUFFER_SIZE];
ssize_t n;
while ((n = mReceiver.getEvents(buf, EVENT_BUFFER_SIZE)) > 0) {
ALOGV("dispatcher %p ~ Read %d events.", this, int(n));
mFrameRateOverrides.reserve(n);
for (ssize_t i = 0; i < n; i++) {
const DisplayEventReceiver::Event& ev = buf[i];
switch (ev.header.type) {
case DisplayEventReceiver::DISPLAY_EVENT_VSYNC:
// Later vsync events will just overwrite the info from earlier
// ones. That's fine, we only care about the most recent.
gotVsync = true;
*outTimestamp = ev.header.timestamp;
*outDisplayId = ev.header.displayId;
*outCount = ev.vsync.count;
*outVsyncEventData = ev.vsync.vsyncData;
break;
case DisplayEventReceiver::DISPLAY_EVENT_HOTPLUG:
if (ev.hotplug.connectionError == 0) {
dispatchHotplug(ev.header.timestamp, ev.header.displayId,
ev.hotplug.connected);
} else {
dispatchHotplugConnectionError(ev.header.timestamp,
ev.hotplug.connectionError);
}
break;
case DisplayEventReceiver::DISPLAY_EVENT_MODE_CHANGE:
dispatchModeChanged(ev.header.timestamp, ev.header.displayId,
ev.modeChange.modeId, ev.modeChange.vsyncPeriod);
break;
case DisplayEventReceiver::DISPLAY_EVENT_NULL:
dispatchNullEvent(ev.header.timestamp, ev.header.displayId);
break;
case DisplayEventReceiver::DISPLAY_EVENT_FRAME_RATE_OVERRIDE:
mFrameRateOverrides.emplace_back(ev.frameRateOverride);
break;
case DisplayEventReceiver::DISPLAY_EVENT_FRAME_RATE_OVERRIDE_FLUSH:
dispatchFrameRateOverrides(ev.header.timestamp, ev.header.displayId,
std::move(mFrameRateOverrides));
break;
case DisplayEventReceiver::DISPLAY_EVENT_HDCP_LEVELS_CHANGE:
dispatchHdcpLevelsChanged(ev.header.displayId,
ev.hdcpLevelsChange.connectedLevel,
ev.hdcpLevelsChange.maxLevel);
break;
default:
ALOGW("dispatcher %p ~ ignoring unknown event type %#x", this, ev.header.type);
break;
}
}
}
if (n < 0) {
ALOGW("Failed to get events from display event dispatcher, status=%d", status_t(n));
}
return gotVsync;
}
status_t DisplayEventDispatcher::getLatestVsyncEventData(
ParcelableVsyncEventData* outVsyncEventData) const {
return mReceiver.getLatestVsyncEventData(outVsyncEventData);
}
} // namespace android
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