1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef V4L2_CAMERA_HAL_METADATA_SCALING_CONVERTER_H_ 18 #define V4L2_CAMERA_HAL_METADATA_SCALING_CONVERTER_H_ 19 20 #include "../common.h" 21 #include "converter_interface.h" 22 23 namespace v4l2_camera_hal { 24 25 // An ScalingConverter scales values up or down. 26 template <typename TMetadata, typename TV4L2> 27 class ScalingConverter : public ConverterInterface<TMetadata, TV4L2> { 28 public: 29 ScalingConverter(TMetadata v4l2_to_metadata_numerator, 30 TMetadata v4l2_to_metadata_denominator); 31 32 virtual int MetadataToV4L2(TMetadata value, TV4L2* conversion) override; 33 virtual int V4L2ToMetadata(TV4L2 value, TMetadata* conversion) override; 34 35 private: 36 const TMetadata v4l2_to_metadata_numerator_; 37 const TMetadata v4l2_to_metadata_denominator_; 38 39 DISALLOW_COPY_AND_ASSIGN(ScalingConverter); 40 }; 41 42 // ----------------------------------------------------------------------------- 43 44 template <typename TMetadata, typename TV4L2> 45 ScalingConverter<TMetadata, TV4L2>::ScalingConverter( 46 TMetadata v4l2_to_metadata_numerator, 47 TMetadata v4l2_to_metadata_denominator) 48 : v4l2_to_metadata_numerator_(v4l2_to_metadata_numerator), 49 v4l2_to_metadata_denominator_(v4l2_to_metadata_denominator) { 50 HAL_LOG_ENTER(); 51 } 52 53 template <typename TMetadata, typename TV4L2> 54 int ScalingConverter<TMetadata, TV4L2>::MetadataToV4L2(TMetadata value, 55 TV4L2* conversion) { 56 HAL_LOG_ENTER(); 57 58 *conversion = static_cast<TV4L2>(value * v4l2_to_metadata_denominator_ / 59 v4l2_to_metadata_numerator_); 60 return 0; 61 } 62 63 template <typename TMetadata, typename TV4L2> 64 int ScalingConverter<TMetadata, TV4L2>::V4L2ToMetadata(TV4L2 value, 65 TMetadata* conversion) { 66 HAL_LOG_ENTER(); 67 68 *conversion = static_cast<TMetadata>(value) * v4l2_to_metadata_numerator_ / 69 v4l2_to_metadata_denominator_; 70 return 0; 71 } 72 73 } // namespace v4l2_camera_hal 74 75 #endif // V4L2_CAMERA_HAL_METADATA_SCALING_CONVERTER_H_ 76
