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      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 
     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 
     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 
     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