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