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      1 /*
      2  * Copyright (C) 2011 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 ANDROID_FILTERFW_CORE_NATIVE_PROGRAM_H
     18 #define ANDROID_FILTERFW_CORE_NATIVE_PROGRAM_H
     19 
     20 #include <vector>
     21 #include <string>
     22 
     23 #include "base/utilities.h"
     24 
     25 namespace android {
     26 namespace filterfw {
     27 
     28 class NativeFrame;
     29 
     30 typedef void (*InitFunctionPtr)(void**);
     31 typedef void (*SetValueFunctionPtr)(const char*, const char*, void*);
     32 typedef void (*GetValueFunctionPtr)(const char*, char*, int, void*);
     33 typedef int (*ProcessFunctionPtr)(const char**, const int*, int, char*, int, void*);
     34 typedef void (*ResetFunctionPtr)(void*);
     35 typedef void (*TeardownFunctionPtr)(void*);
     36 
     37 class NativeProgram {
     38   public:
     39     // Create an empty native frame.
     40     NativeProgram();
     41 
     42     ~NativeProgram();
     43 
     44     bool OpenLibrary(const std::string& lib_name);
     45 
     46     bool BindInitFunction(const std::string& func_name);
     47     bool BindSetValueFunction(const std::string& func_name);
     48     bool BindGetValueFunction(const std::string& func_name);
     49     bool BindProcessFunction(const std::string& func_name);
     50     bool BindResetFunction(const std::string& func_name);
     51     bool BindTeardownFunction(const std::string& func_name);
     52 
     53     bool CallInit();
     54     bool CallSetValue(const std::string& key, const std::string& value);
     55     std::string CallGetValue(const std::string& key);
     56     bool CallProcess(const std::vector<const char*>& inputs,
     57                      const std::vector<int>& input_sizes,
     58                      char* output,
     59                      int output_size);
     60     bool CallReset();
     61     bool CallTeardown();
     62 
     63   private:
     64     // Pointer to the data. Owned by the frame.
     65     void* lib_handle_;
     66 
     67     // The function pointers to the native function implementations.
     68     InitFunctionPtr init_function_;
     69     SetValueFunctionPtr setvalue_function_;
     70     GetValueFunctionPtr getvalue_function_;
     71     ProcessFunctionPtr process_function_;
     72     ResetFunctionPtr reset_function_;
     73     TeardownFunctionPtr teardown_function_;
     74 
     75     // Pointer to user data
     76     void* user_data_;
     77 
     78     DISALLOW_COPY_AND_ASSIGN(NativeProgram);
     79 };
     80 
     81 } // namespace filterfw
     82 } // namespace android
     83 
     84 #endif  // ANDROID_FILTERFW_CORE_NATIVE_PROGRAM_H
     85