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_STATE_H_
18 #define V4L2_CAMERA_HAL_METADATA_STATE_H_
19
20 #include "common.h"
21 #include "metadata_common.h"
22 #include "partial_metadata_interface.h"
23 #include "state_delegate_interface.h"
24
25 namespace v4l2_camera_hal {
26
27 // A State is a PartialMetadata that only has a single dynamic value.
28 template <typename T>
29 class State : public PartialMetadataInterface {
30 public:
State(int32_t tag,std::unique_ptr<StateDelegateInterface<T>> delegate)31 State(int32_t tag, std::unique_ptr<StateDelegateInterface<T>> delegate)
32 : tag_(tag), delegate_(std::move(delegate)){};
33
StaticTags()34 virtual std::vector<int32_t> StaticTags() const override { return {}; };
ControlTags()35 virtual std::vector<int32_t> ControlTags() const override { return {}; };
DynamicTags()36 virtual std::vector<int32_t> DynamicTags() const override { return {tag_}; };
37
38 virtual int PopulateStaticFields(
39 android::CameraMetadata* metadata) const override;
40 virtual int PopulateDynamicFields(
41 android::CameraMetadata* metadata) const override;
42 virtual int PopulateTemplateRequest(
43 int template_type, android::CameraMetadata* metadata) const override;
44 virtual bool SupportsRequestValues(
45 const android::CameraMetadata& metadata) const override;
46 virtual int SetRequestValues(
47 const android::CameraMetadata& metadata) override;
48
49 private:
50 int32_t tag_;
51 std::unique_ptr<StateDelegateInterface<T>> delegate_;
52 };
53
54 // -----------------------------------------------------------------------------
55
56 template <typename T>
PopulateStaticFields(android::CameraMetadata *)57 int State<T>::PopulateStaticFields(android::CameraMetadata* /*metadata*/) const {
58 HAL_LOG_ENTER();
59 return 0;
60 }
61
62 template <typename T>
PopulateDynamicFields(android::CameraMetadata * metadata)63 int State<T>::PopulateDynamicFields(android::CameraMetadata* metadata) const {
64 HAL_LOG_ENTER();
65
66 T value;
67 int res = delegate_->GetValue(&value);
68 if (res) {
69 return res;
70 }
71 return UpdateMetadata(metadata, tag_, value);
72 };
73
74 template <typename T>
PopulateTemplateRequest(int,android::CameraMetadata *)75 int State<T>::PopulateTemplateRequest(int /*template_type*/,
76 android::CameraMetadata* /*metadata*/) const {
77 HAL_LOG_ENTER();
78 return 0;
79 };
80
81 template <typename T>
SupportsRequestValues(const android::CameraMetadata &)82 bool State<T>::SupportsRequestValues(
83 const android::CameraMetadata& /*metadata*/) const {
84 HAL_LOG_ENTER();
85 return true;
86 };
87
88 template <typename T>
SetRequestValues(const android::CameraMetadata &)89 int State<T>::SetRequestValues(const android::CameraMetadata& /*metadata*/) {
90 HAL_LOG_ENTER();
91 return 0;
92 };
93
94 } // namespace v4l2_camera_hal
95
96 #endif // V4L2_CAMERA_HAL_METADATA_STATE_H_
97