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 #include "enum_converter.h"
18
19 #include <errno.h>
20
21 #include "../common.h"
22
23 namespace v4l2_camera_hal {
24
EnumConverter(const std::multimap<int32_t,uint8_t> & v4l2_to_metadata)25 EnumConverter::EnumConverter(
26 const std::multimap<int32_t, uint8_t>& v4l2_to_metadata)
27 : v4l2_to_metadata_(v4l2_to_metadata) {
28 HAL_LOG_ENTER();
29 }
30
MetadataToV4L2(uint8_t value,int32_t * conversion)31 int EnumConverter::MetadataToV4L2(uint8_t value, int32_t* conversion) {
32 // Unfortunately no bi-directional map lookup in C++.
33 // Breaking on second, not first found so that a warning
34 // can be given if there are multiple values.
35 size_t count = 0;
36 for (auto kv : v4l2_to_metadata_) {
37 if (kv.second == value) {
38 ++count;
39 if (count == 1) {
40 // First match.
41 *conversion = kv.first;
42 } else {
43 // second match.
44 break;
45 }
46 }
47 }
48
49 if (count == 0) {
50 HAL_LOGV("Couldn't find V4L2 conversion of metadata value %d.", value);
51 return -EINVAL;
52 } else if (count > 1) {
53 HAL_LOGV(
54 "Multiple V4L2 conversions found for metadata value %d, using first.",
55 value);
56 }
57 return 0;
58 }
59
V4L2ToMetadata(int32_t value,uint8_t * conversion)60 int EnumConverter::V4L2ToMetadata(int32_t value, uint8_t* conversion) {
61 auto element_range = v4l2_to_metadata_.equal_range(value);
62 if (element_range.first == element_range.second) {
63 HAL_LOGV("Couldn't find metadata conversion of V4L2 value %d.", value);
64 return -EINVAL;
65 }
66
67 auto element = element_range.first;
68 *conversion = element->second;
69
70 if (++element != element_range.second) {
71 HAL_LOGV(
72 "Multiple metadata conversions found for V4L2 value %d, using first.",
73 value);
74 }
75 return 0;
76 }
77
78 } // namespace v4l2_camera_hal
79