/*
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* Copyright (C) 2016 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 "android.hardware.automotive.evs@1.0-service"
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#include "EvsEnumerator.h"
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#include "EvsCamera.h"
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#include "EvsDisplay.h"
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namespace android {
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namespace hardware {
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namespace automotive {
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namespace evs {
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namespace V1_0 {
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namespace implementation {
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// NOTE: All members values are static so that all clients operate on the same state
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// That is to say, this is effectively a singleton despite the fact that HIDL
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// constructs a new instance for each client.
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std::list<EvsEnumerator::CameraRecord> EvsEnumerator::sCameraList;
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wp<EvsDisplay> EvsEnumerator::sActiveDisplay;
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EvsEnumerator::EvsEnumerator() {
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ALOGD("EvsEnumerator created");
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// Add sample camera data to our list of cameras
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// In a real driver, this would be expected to can the available hardware
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sCameraList.emplace_back(EvsCamera::kCameraName_Backup);
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sCameraList.emplace_back("LaneView");
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sCameraList.emplace_back("right turn");
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}
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// Methods from ::android::hardware::automotive::evs::V1_0::IEvsEnumerator follow.
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Return<void> EvsEnumerator::getCameraList(getCameraList_cb _hidl_cb) {
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ALOGD("getCameraList");
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const unsigned numCameras = sCameraList.size();
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// Build up a packed array of CameraDesc for return
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// NOTE: Only has to live until the callback returns
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std::vector<CameraDesc> descriptions;
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descriptions.reserve(numCameras);
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for (const auto& cam : sCameraList) {
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descriptions.push_back( cam.desc );
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}
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// Encapsulate our camera descriptions in the HIDL vec type
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hidl_vec<CameraDesc> hidlCameras(descriptions);
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// Send back the results
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ALOGD("reporting %zu cameras available", hidlCameras.size());
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_hidl_cb(hidlCameras);
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// HIDL convention says we return Void if we sent our result back via callback
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return Void();
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}
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Return<sp<IEvsCamera>> EvsEnumerator::openCamera(const hidl_string& cameraId) {
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ALOGD("openCamera");
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// Find the named camera
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CameraRecord *pRecord = nullptr;
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for (auto &&cam : sCameraList) {
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if (cam.desc.cameraId == cameraId) {
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// Found a match!
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pRecord = &cam;
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break;
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}
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}
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// Is this a recognized camera id?
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if (!pRecord) {
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ALOGE("Requested camera %s not found", cameraId.c_str());
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return nullptr;
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}
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// Has this camera already been instantiated by another caller?
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sp<EvsCamera> pActiveCamera = pRecord->activeInstance.promote();
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if (pActiveCamera != nullptr) {
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ALOGW("Killing previous camera because of new caller");
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closeCamera(pActiveCamera);
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}
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// Construct a camera instance for the caller
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pActiveCamera = new EvsCamera(cameraId.c_str());
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pRecord->activeInstance = pActiveCamera;
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if (pActiveCamera == nullptr) {
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ALOGE("Failed to allocate new EvsCamera object for %s\n", cameraId.c_str());
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}
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return pActiveCamera;
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}
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Return<void> EvsEnumerator::closeCamera(const ::android::sp<IEvsCamera>& pCamera) {
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ALOGD("closeCamera");
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if (pCamera == nullptr) {
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ALOGE("Ignoring call to closeCamera with null camera ptr");
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return Void();
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}
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// Get the camera id so we can find it in our list
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std::string cameraId;
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pCamera->getCameraInfo([&cameraId](CameraDesc desc) {
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// TODO(b/36532780) Should we able to just use a simple assignment?
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// cameraId = desc.cameraId;
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cameraId.assign(desc.cameraId.c_str());
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}
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);
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// Find the named camera
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CameraRecord *pRecord = nullptr;
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for (auto &&cam : sCameraList) {
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if (cam.desc.cameraId == cameraId) {
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// Found a match!
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pRecord = &cam;
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break;
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}
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}
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// Is the display being destroyed actually the one we think is active?
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if (!pRecord) {
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ALOGE("Asked to close a camera who's name isn't recognized");
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} else {
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sp<EvsCamera> pActiveCamera = pRecord->activeInstance.promote();
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if (pActiveCamera == nullptr) {
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ALOGE("Somehow a camera is being destroyed when the enumerator didn't know one existed");
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} else if (pActiveCamera != pCamera) {
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// This can happen if the camera was aggressively reopened, orphaning this previous instance
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ALOGW("Ignoring close of previously orphaned camera - why did a client steal?");
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} else {
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// Drop the active camera
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pActiveCamera->forceShutdown();
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pRecord->activeInstance = nullptr;
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}
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}
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return Void();
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}
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Return<sp<IEvsDisplay>> EvsEnumerator::openDisplay() {
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ALOGD("openDisplay");
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// If we already have a display active, then we need to shut it down so we can
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// give exclusive access to the new caller.
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sp<EvsDisplay> pActiveDisplay = sActiveDisplay.promote();
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if (pActiveDisplay != nullptr) {
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ALOGW("Killing previous display because of new caller");
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closeDisplay(pActiveDisplay);
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}
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// Create a new display interface and return it
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pActiveDisplay = new EvsDisplay();
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sActiveDisplay = pActiveDisplay;
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ALOGD("Returning new EvsDisplay object %p", pActiveDisplay.get());
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return pActiveDisplay;
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}
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Return<void> EvsEnumerator::closeDisplay(const ::android::sp<IEvsDisplay>& pDisplay) {
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ALOGD("closeDisplay");
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// Do we still have a display object we think should be active?
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sp<EvsDisplay> pActiveDisplay = sActiveDisplay.promote();
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if (pActiveDisplay == nullptr) {
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ALOGE("Somehow a display is being destroyed when the enumerator didn't know one existed");
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} else if (sActiveDisplay != pDisplay) {
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ALOGW("Ignoring close of previously orphaned display - why did a client steal?");
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} else {
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// Drop the active display
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pActiveDisplay->forceShutdown();
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sActiveDisplay = nullptr;
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}
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return Void();
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}
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Return<DisplayState> EvsEnumerator::getDisplayState() {
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ALOGD("getDisplayState");
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// Do we still have a display object we think should be active?
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sp<IEvsDisplay> pActiveDisplay = sActiveDisplay.promote();
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if (pActiveDisplay != nullptr) {
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return pActiveDisplay->getDisplayState();
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} else {
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return DisplayState::NOT_OPEN;
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}
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}
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} // namespace implementation
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} // namespace V1_0
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} // namespace evs
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} // namespace automotive
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} // namespace hardware
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} // namespace android
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