/*
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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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/*
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* Contains implementation of a class EmulatedQemuCamera that encapsulates
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* functionality of an emulated camera connected to the host.
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*/
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#define LOG_NDEBUG 0
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#define LOG_TAG "EmulatedCamera_QemuCamera"
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#include <log/log.h>
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#include "EmulatedQemuCamera.h"
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#include "EmulatedCameraFactory.h"
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#undef min
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#undef max
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#include <sstream>
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#include <string>
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#include <vector>
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namespace android {
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EmulatedQemuCamera::EmulatedQemuCamera(int cameraId, struct hw_module_t* module)
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: EmulatedCamera(cameraId, module),
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mQemuCameraDevice(this)
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{
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}
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EmulatedQemuCamera::~EmulatedQemuCamera()
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{
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}
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/****************************************************************************
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* EmulatedCamera virtual overrides.
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***************************************************************************/
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status_t EmulatedQemuCamera::Initialize(const char* device_name,
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const char* frame_dims,
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const char* facing_dir)
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{
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ALOGV("%s:\n Name=%s\n Facing '%s'\n Dimensions=%s",
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__FUNCTION__, device_name, facing_dir, frame_dims);
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/* Save dimensions. */
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mFrameDims = frame_dims;
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/* Initialize camera device. */
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status_t res = mQemuCameraDevice.Initialize(device_name);
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if (res != NO_ERROR) {
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return res;
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}
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/* Initialize base class. */
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res = EmulatedCamera::Initialize();
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if (res != NO_ERROR) {
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return res;
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}
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/*
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* Set customizable parameters.
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*/
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using Size = std::pair<int, int>;
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std::vector<Size> resolutions;
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std::stringstream ss(frame_dims);
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std::string input;
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while (std::getline(ss, input, ',')) {
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int width = 0;
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int height = 0;
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char none = 0;
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/* Expect only two results because that means there was nothing after
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* the height, we don't want any trailing characters. Otherwise we just
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* ignore this entry. */
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if (sscanf(input.c_str(), "%dx%d%c", &width, &height, &none) == 2) {
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resolutions.push_back(Size(width, height));
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ALOGI("%s: %dx%d", __FUNCTION__, width, height);
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}
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}
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/* The Android framework contains a wrapper around the v1 Camera API so that
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* it can be used with API v2. This wrapper attempts to figure out the
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* sensor resolution of the camera by looking at the resolution with the
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* largest area and infer that the dimensions of that resolution must also
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* be the size of the camera sensor. Any resolution with a dimension that
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* exceeds the sensor size will be rejected so Camera API calls will start
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* failing. To work around this we remove any resolutions with at least one
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* dimension exceeding that of the max area resolution. */
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/* First find the resolution with the maximum area, the "sensor size" */
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int maxArea = 0;
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int maxAreaWidth = 0;
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int maxAreaHeight = 0;
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for (const auto& res : resolutions) {
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int area = res.first * res.second;
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if (area > maxArea) {
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maxArea = area;
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maxAreaWidth = res.first;
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maxAreaHeight = res.second;
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}
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}
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/* Next remove any resolution with a dimension exceeding the sensor size. */
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for (auto res = resolutions.begin(); res != resolutions.end(); ) {
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if (res->first > maxAreaWidth || res->second > maxAreaHeight) {
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/* Width and/or height larger than sensor, remove it */
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res = resolutions.erase(res);
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} else {
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++res;
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}
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}
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if (resolutions.empty()) {
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ALOGE("%s: Qemu camera has no valid resolutions", __FUNCTION__);
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return EINVAL;
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}
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/* Next rebuild the frame size string for the camera parameters */
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std::stringstream sizesStream;
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for (size_t i = 0; i < resolutions.size(); ++i) {
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if (i != 0) {
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sizesStream << ',';
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}
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sizesStream << resolutions[i].first << 'x' << resolutions[i].second;
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}
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std::string sizes = sizesStream.str();
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mParameters.set(EmulatedCamera::FACING_KEY, facing_dir);
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mParameters.set(EmulatedCamera::ORIENTATION_KEY,
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gEmulatedCameraFactory.getQemuCameraOrientation());
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mParameters.set(CameraParameters::KEY_ROTATION,
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gEmulatedCameraFactory.getQemuCameraOrientation());
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mParameters.set(CameraParameters::KEY_SUPPORTED_PICTURE_SIZES,
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sizes.c_str());
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mParameters.set(CameraParameters::KEY_SUPPORTED_PREVIEW_SIZES,
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sizes.c_str());
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mParameters.set(CameraParameters::KEY_SUPPORTED_VIDEO_SIZES,
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sizes.c_str());
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std::string preferred_size = std::to_string(resolutions[0].first)
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+ "x" + std::to_string(resolutions[0].second);
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mParameters.set(CameraParameters::KEY_PREFERRED_PREVIEW_SIZE_FOR_VIDEO,
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preferred_size.c_str());
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/*
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* Use first dimension reported by the device to set current preview and
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* picture sizes.
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*/
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int x = resolutions[0].first;
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int y = resolutions[0].second;
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mParameters.setPreviewSize(x, y);
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mParameters.setPictureSize(x, y);
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ALOGV("%s: Qemu camera %s is initialized. Current frame is %dx%d",
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__FUNCTION__, device_name, x, y);
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return NO_ERROR;
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}
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EmulatedCameraDevice* EmulatedQemuCamera::getCameraDevice()
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{
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return &mQemuCameraDevice;
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}
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}; /* namespace android */
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