82 lines
2.2 KiB
C++
82 lines
2.2 KiB
C++
/*
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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_NDEBUG 0
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#define LOG_TAG "EnumConverter"
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#include "enum_converter.h"
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#include <cerrno>
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#include "common.h"
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namespace v4l2_camera_hal {
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EnumConverter::EnumConverter(
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const std::multimap<int32_t, uint8_t>& v4l2_to_metadata)
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: v4l2_to_metadata_(v4l2_to_metadata) {
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HAL_LOG_ENTER();
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}
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int EnumConverter::MetadataToV4L2(uint8_t value, int32_t* conversion) {
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// Unfortunately no bi-directional map lookup in C++.
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// Breaking on second, not first found so that a warning
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// can be given if there are multiple values.
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size_t count = 0;
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for (auto kv : v4l2_to_metadata_) {
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if (kv.second == value) {
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++count;
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if (count == 1) {
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// First match.
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*conversion = kv.first;
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} else {
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// second match.
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break;
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}
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}
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}
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if (count == 0) {
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HAL_LOGV("Couldn't find V4L2 conversion of metadata value %d.", value);
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return -EINVAL;
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} else if (count > 1) {
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HAL_LOGV(
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"Multiple V4L2 conversions found for metadata value %d, using first.",
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value);
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}
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return 0;
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}
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int EnumConverter::V4L2ToMetadata(int32_t value, uint8_t* conversion) {
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auto element_range = v4l2_to_metadata_.equal_range(value);
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if (element_range.first == element_range.second) {
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HAL_LOGV("Couldn't find metadata conversion of V4L2 value %d.", value);
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return -EINVAL;
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}
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auto element = element_range.first;
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*conversion = element->second;
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if (++element != element_range.second) {
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HAL_LOGV(
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"Multiple metadata conversions found for V4L2 value %d, using first.",
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value);
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}
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return 0;
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}
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} // namespace v4l2_camera_hal
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