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>
ScalingConverter(TMetadata v4l2_to_metadata_numerator,TMetadata v4l2_to_metadata_denominator)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>
MetadataToV4L2(TMetadata value,TV4L2 * conversion)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>
V4L2ToMetadata(TV4L2 value,TMetadata * conversion)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