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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.
*/
#ifndef V4L2_CAMERA_HAL_METADATA_RANGED_CONVERTER_H_
#define V4L2_CAMERA_HAL_METADATA_RANGED_CONVERTER_H_
#include <memory>
#include <android-base/macros.h>
#include "converter_interface.h"
namespace v4l2_camera_hal {
// An RangedConverter fits values converted by a wrapped converter
// to a stepped range (when going from metadata -> v4l2. The other
// direction remains unchanged).
template <typename TMetadata, typename TV4L2>
class RangedConverter : public ConverterInterface<TMetadata, TV4L2> {
public:
RangedConverter(
std::shared_ptr<ConverterInterface<TMetadata, TV4L2>> wrapped_converter,
TV4L2 min,
TV4L2 max,
TV4L2 step);
virtual int MetadataToV4L2(TMetadata value, TV4L2* conversion) override;
virtual int V4L2ToMetadata(TV4L2 value, TMetadata* conversion) override;
private:
std::shared_ptr<ConverterInterface<TMetadata, TV4L2>> wrapped_converter_;
const TV4L2 min_;
const TV4L2 max_;
const TV4L2 step_;
DISALLOW_COPY_AND_ASSIGN(RangedConverter);
};
// -----------------------------------------------------------------------------
template <typename TMetadata, typename TV4L2>
RangedConverter<TMetadata, TV4L2>::RangedConverter(
std::shared_ptr<ConverterInterface<TMetadata, TV4L2>> wrapped_converter,
TV4L2 min,
TV4L2 max,
TV4L2 step)
: wrapped_converter_(std::move(wrapped_converter)),
min_(min),
max_(max),
step_(step) {
HAL_LOG_ENTER();
}
template <typename TMetadata, typename TV4L2>
int RangedConverter<TMetadata, TV4L2>::MetadataToV4L2(TMetadata value,
TV4L2* conversion) {
HAL_LOG_ENTER();
TV4L2 raw_conversion = 0;
int res = wrapped_converter_->MetadataToV4L2(value, &raw_conversion);
if (res) {
HAL_LOGE("Failed to perform underlying conversion.");
return res;
}
// Round down to step (steps start at min_).
raw_conversion -= (raw_conversion - min_) % step_;
// Clamp to range.
if (raw_conversion < min_) {
raw_conversion = min_;
} else if (raw_conversion > max_) {
raw_conversion = max_;
}
*conversion = raw_conversion;
return 0;
}
template <typename TMetadata, typename TV4L2>
int RangedConverter<TMetadata, TV4L2>::V4L2ToMetadata(TV4L2 value,
TMetadata* conversion) {
HAL_LOG_ENTER();
return wrapped_converter_->V4L2ToMetadata(value, conversion);
}
} // namespace v4l2_camera_hal
#endif // V4L2_CAMERA_HAL_METADATA_RANGED_CONVERTER_H_
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