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 //#define LOG_NDEBUG 0
18 #define LOG_TAG "EnumConverter"
19
20 #include "enum_converter.h"
21
22 #include <cerrno>
23
24 #include "common.h"
25
26 namespace v4l2_camera_hal {
27
EnumConverter(const std::multimap<int32_t,uint8_t> & v4l2_to_metadata)28 EnumConverter::EnumConverter(
29 const std::multimap<int32_t, uint8_t>& v4l2_to_metadata)
30 : v4l2_to_metadata_(v4l2_to_metadata) {
31 HAL_LOG_ENTER();
32 }
33
MetadataToV4L2(uint8_t value,int32_t * conversion)34 int EnumConverter::MetadataToV4L2(uint8_t value, int32_t* conversion) {
35 // Unfortunately no bi-directional map lookup in C++.
36 // Breaking on second, not first found so that a warning
37 // can be given if there are multiple values.
38 size_t count = 0;
39 for (auto kv : v4l2_to_metadata_) {
40 if (kv.second == value) {
41 ++count;
42 if (count == 1) {
43 // First match.
44 *conversion = kv.first;
45 } else {
46 // second match.
47 break;
48 }
49 }
50 }
51
52 if (count == 0) {
53 HAL_LOGV("Couldn't find V4L2 conversion of metadata value %d.", value);
54 return -EINVAL;
55 } else if (count > 1) {
56 HAL_LOGV(
57 "Multiple V4L2 conversions found for metadata value %d, using first.",
58 value);
59 }
60 return 0;
61 }
62
V4L2ToMetadata(int32_t value,uint8_t * conversion)63 int EnumConverter::V4L2ToMetadata(int32_t value, uint8_t* conversion) {
64 auto element_range = v4l2_to_metadata_.equal_range(value);
65 if (element_range.first == element_range.second) {
66 HAL_LOGV("Couldn't find metadata conversion of V4L2 value %d.", value);
67 return -EINVAL;
68 }
69
70 auto element = element_range.first;
71 *conversion = element->second;
72
73 if (++element != element_range.second) {
74 HAL_LOGV(
75 "Multiple metadata conversions found for V4L2 value %d, using first.",
76 value);
77 }
78 return 0;
79 }
80
81 } // namespace v4l2_camera_hal
82