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/*
* Copyright (C) 2016 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.
*/
#include <stdio.h>
#include <hidl/HidlTransportSupport.h>
#include <utils/Errors.h>
#include <utils/StrongPointer.h>
#include <utils/Log.h>
#include "android-base/macros.h" // arraysize
#include <android/hardware/automotive/evs/1.0/IEvsEnumerator.h>
#include <android/hardware/automotive/evs/1.0/IEvsDisplay.h>
#include <hwbinder/ProcessState.h>
#include "EvsStateControl.h"
#include "EvsVehicleListener.h"
#include "ConfigManager.h"
// libhidl:
using android::hardware::configureRpcThreadpool;
using android::hardware::joinRpcThreadpool;
// Helper to subscribe to VHal notifications
static bool subscribeToVHal(sp<IVehicle> pVnet,
sp<IVehicleCallback> listener,
VehicleProperty propertyId) {
assert(pVnet != nullptr);
assert(listener != nullptr);
// Register for vehicle state change callbacks we care about
// Changes in these values are what will trigger a reconfiguration of the EVS pipeline
SubscribeOptions optionsData[] = {
{
.propId = static_cast<int32_t>(propertyId),
.flags = SubscribeFlags::EVENTS_FROM_CAR
},
};
hidl_vec <SubscribeOptions> options;
options.setToExternal(optionsData, arraysize(optionsData));
StatusCode status = pVnet->subscribe(listener, options);
if (status != StatusCode::OK) {
ALOGW("VHAL subscription for property 0x%08X failed with code %d.", propertyId, status);
return false;
}
return true;
}
// Main entry point
int main(int argc, char** argv)
{
ALOGI("EVS app starting\n");
// Set up default behavior, then check for command line options
bool useVehicleHal = true;
bool printHelp = false;
const char* evsServiceName = "default";
for (int i=1; i< argc; i++) {
if (strcmp(argv[i], "--test") == 0) {
useVehicleHal = false;
} else if (strcmp(argv[i], "--hw") == 0) {
evsServiceName = "EvsEnumeratorHw";
} else if (strcmp(argv[i], "--mock") == 0) {
evsServiceName = "EvsEnumeratorHw-Mock";
} else if (strcmp(argv[i], "--help") == 0) {
printHelp = true;
} else {
printf("Ignoring unrecognized command line arg '%s'\n", argv[i]);
printHelp = true;
}
}
if (printHelp) {
printf("Options include:\n");
printf(" --test Do not talk to Vehicle Hal, but simulate 'reverse' instead\n");
printf(" --hw Bypass EvsManager by connecting directly to EvsEnumeratorHw\n");
printf(" --mock Connect directly to EvsEnumeratorHw-Mock\n");
}
// Load our configuration information
ConfigManager config;
if (!config.initialize("/system/etc/automotive/evs/config.json")) {
ALOGE("Missing or improper configuration for the EVS application. Exiting.");
return 1;
}
// Set thread pool size to one to avoid concurrent events from the HAL.
// This pool will handle the EvsCameraStream callbacks.
// Note: This _will_ run in parallel with the EvsListener run() loop below which
// runs the application logic that reacts to the async events.
configureRpcThreadpool(1, false /* callerWillJoin */);
// Construct our async helper object
sp<EvsVehicleListener> pEvsListener = new EvsVehicleListener();
// Get the EVS manager service
ALOGI("Acquiring EVS Enumerator");
android::sp<IEvsEnumerator> pEvs = IEvsEnumerator::getService(evsServiceName);
if (pEvs.get() == nullptr) {
ALOGE("getService(%s) returned NULL. Exiting.", evsServiceName);
return 1;
}
// Request exclusive access to the EVS display
ALOGI("Acquiring EVS Display");
android::sp <IEvsDisplay> pDisplay;
pDisplay = pEvs->openDisplay();
if (pDisplay.get() == nullptr) {
ALOGE("EVS Display unavailable. Exiting.");
return 1;
}
// Connect to the Vehicle HAL so we can monitor state
sp<IVehicle> pVnet;
if (useVehicleHal) {
ALOGI("Connecting to Vehicle HAL");
pVnet = IVehicle::getService();
if (pVnet.get() == nullptr) {
ALOGE("Vehicle HAL getService returned NULL. Exiting.");
return 1;
} else {
// Register for vehicle state change callbacks we care about
// Changes in these values are what will trigger a reconfiguration of the EVS pipeline
if (!subscribeToVHal(pVnet, pEvsListener, VehicleProperty::GEAR_SELECTION)) {
ALOGE("Without gear notification, we can't support EVS. Exiting.");
return 1;
}
if (!subscribeToVHal(pVnet, pEvsListener, VehicleProperty::TURN_SIGNAL_STATE)) {
ALOGW("Didn't get turn signal notificaitons, so we'll ignore those.");
}
}
} else {
ALOGW("Test mode selected, so not talking to Vehicle HAL");
}
// Configure ourselves for the current vehicle state at startup
ALOGI("Constructing state controller");
EvsStateControl *pStateController = new EvsStateControl(pVnet, pEvs, pDisplay, config);
if (!pStateController->startUpdateLoop()) {
ALOGE("Initial configuration failed. Exiting.");
return 1;
}
// Run forever, reacting to events as necessary
ALOGI("Entering running state");
pEvsListener->run(pStateController);
// In normal operation, we expect to run forever, but in some error conditions we'll quit.
// One known example is if another process preempts our registration for our service name.
ALOGE("EVS Listener stopped. Exiting.");
return 0;
}
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