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