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102 lines
3.1 KiB
102 lines
3.1 KiB
/* |
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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 "../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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