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8. IDecode和FFDecode模块代码创建~1

发布时间：2021-06-09 15:27:15编辑：雪饮阅读（）

 封装解码器获取与具体的解码以及对于下一步的考量，对于FFDecode、Idecode、Xparameter的cpp或者头文件的完善。

cpp/CMakeLists.txt:
# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html

# Sets the minimum version of CMake required to build the native library.

cmake_minimum_required(VERSION 3.10.2)

# Declares and names the project.

project("xplay")

# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.
#添加頭文件路徑(括號中的include是相對於本文件路徑)
include_directories(../../../include)
#設置ffmpeg庫所在路徑的變量，這裏的FF是自定義的一個名字
set(FF ${CMAKE_CURRENT_SOURCE_DIR}/../../../libs/${ANDROID_ABI})
#avcodec這個是自定義的一個名字
add_library(avcodec SHARED IMPORTED)
set_target_properties(avcodec PROPERTIES IMPORTED_LOCATION ${FF}/libavcodec.so)

add_library(avformat SHARED IMPORTED)
set_target_properties(avformat PROPERTIES IMPORTED_LOCATION ${FF}/libavformat.so)

add_library(avutil SHARED IMPORTED)
set_target_properties(avutil PROPERTIES IMPORTED_LOCATION ${FF}/libavutil.so)

add_library(swscale SHARED IMPORTED)
set_target_properties(swscale PROPERTIES IMPORTED_LOCATION ${FF}/libswscale.so)

add_library(swresample SHARED IMPORTED)
set_target_properties(swresample PROPERTIES IMPORTED_LOCATION ${FF}/libswresample.so)
add_library( # Sets the name of the library.
             native-lib

             # Sets the library as a shared library.
             SHARED

             # Provides a relative path to your source file(s).
            #src/main/cpp/native-lib.cpp
            IDemux
            FFDemux
            XData
            XLog
            native-lib.cpp
            XThread
            IObserver
            FFDecode
            IDecode
            XParameter
        )

# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.

find_library( # Sets the name of the path variable.
              log-lib

              # Specifies the name of the NDK library that
              # you want CMake to locate.
              log )

# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.

target_link_libraries( # Specifies the target library.
                       native-lib
                       GLESv2 EGL
                       OpenSLES
                       android
                       avcodec avformat avutil swscale swresample
                       # Links the target library to the log library
                       # included in the NDK.
                       ${log-lib} )
cpp/IDecode.cpp:

#include "IDecode.h"

cpp/IDecode.h: #ifndef XPLAY_IDECODE_H
#define XPLAY_IDECODE_H

#include "XParameter.h"
#include "IObserver.h"

//解码接口，支持硬解码
class IDecode:public IObserver
{
public:
    //打开解码器
    virtual bool Open(XParameter para) = 0;

};


#endif //XPLAY_IDECODE_H

cpp/FFDecode.cpp: extern "C"
{
    #include <libavcodec/avcodec.h>
}
#include "FFDecode.h"
#include "XLog.h"
bool FFDecode::Open(XParameter para)
{
    if(!para.para) return false;
    AVCodecParameters *p = para.para;
    //1 查找解码器
    AVCodec *cd = avcodec_find_decoder(p->codec_id);
    if(!cd)
    {
        XLOGE("avcodec_find_decoder %d failed!",p->codec_id);
        return false;
    }
    XLOGI("avcodec_find_decoder success!");
    //2 创建解码上下文，并复制参数
    codec = avcodec_alloc_context3(cd);
    avcodec_parameters_to_context(codec,p);

    //3 打开解码器
    int re = avcodec_open2(codec,0,0);
    if(re != 0)
    {
        char buf[1024] = {0};
        av_strerror(re,buf,sizeof(buf)-1);
        XLOGE("%s",buf);
        return false;
    }

    XLOGI("avcodec_open2 success!");
    return true;
}

cpp/FFDecode.h: #ifndef XPLAY_FFDECODE_H
#define XPLAY_FFDECODE_H


#include "XParameter.h"
#include "IDecode.h"

struct AVCodecContext;

class FFDecode:public IDecode
{
public:
    virtual bool Open(XParameter para);

protected:
    AVCodecContext *codec = 0;
};


#endif //XPLAY_FFDECODE_H

cpp/XParameter.h: #ifndef XPLAY_XPARAMETER_H
#define XPLAY_XPARAMETER_H
struct AVCodecParameters;
class XParameter
{
public:
    AVCodecParameters *para = 0;

};


#endif //XPLAY_XPARAMETER_H

cpp/XParameter.cpp: #include "XParameter.h"

魅族16T编译运行没有问题：