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2. 创建安卓流媒体播放器XPlay项目并配置添加了解封装模块代码及其依赖日志类~1

发布时间：2021-06-08 17:56:33编辑：雪饮阅读（）

 为了防止编译时候遇到arm64-v8a架构，而且现在64位比较主流。并且调整了ndk的版本。所以：app/build.gradle:

plugins {
    id 'com.android.application'
}

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.3"

    defaultConfig {
        applicationId "com.example.xplay"
        minSdkVersion 16
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        externalNativeBuild {
            cmake {
                cppFlags "-std=c++11"
            }
            ndk{
                abiFilters "armeabi-v7a"
                abiFilters "arm64-v8a"
            }
        }
        sourceSets{
            main{
                jniLibs.srcDirs=['libs']
            }
        }
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    packagingOptions {
        pickFirst 'lib/armeabi-v7a/libavcodec.so'
        pickFirst 'lib/armeabi-v7a/libavutil.so'
        pickFirst 'lib/armeabi-v7a/libavformat.so'
        pickFirst 'lib/armeabi-v7a/libswscale.so'
        pickFirst 'lib/armeabi-v7a/libswresample.so'
        pickFirst 'lib/arm64-v8a/libavcodec.so'
        pickFirst 'lib/arm64-v8a/libavutil.so'
        pickFirst 'lib/arm64-v8a/libavformat.so'
        pickFirst 'lib/arm64-v8a/libswscale.so'
        pickFirst 'lib/arm64-v8a/libswresample.so'
    }
    externalNativeBuild {
        cmake {
            path "src/main/cpp/CMakeLists.txt"
            version "3.10.2"
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    ndkVersion '14.1.3816874'
}

dependencies {
    implementation 'androidx.appcompat:appcompat:1.3.0'
    implementation 'com.google.android.material:material:1.3.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
}
cpp/CMakeLists.txt:中要添加自己定义的cpp，这些cpp可以不用编写后缀.cpp但是最后要保留一个” native-lib.cpp”,这个必须带有.cpp后缀：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
        )

# 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} )

如果上面最后一个cpp不加cpp后缀，则会遇到



这个错误，这个错误产生于cpp/native-lib.cpp（同时这个文件也有改动）:
#include <jni.h>
#include <string>
#include "FFDemux.h"
extern "C" JNIEXPORT jstring JNICALL
Java_com_example_xplay_MainActivity_stringFromJNI(
        JNIEnv* env,
        jobject /* this */) {
    std::string hello = "Hello from C++";
    IDemux *de = new FFDemux();
    de->Open("/sdcard/1080.mp4");
    return env->NewStringUTF(hello.c_str());
}

用了r14b的ndk，这个ndk比较老，老版本ndk目录配置在local.properties文件中：

local.properties：
## This file is automatically generated by Android Studio.
# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
#
# This file should *NOT* be checked into Version Control Systems,
# as it contains information specific to your local configuration.
#
# Location of the SDK. This is only used by Gradle.
# For customization when using a Version Control System, please read the
# header note.
ndk.dir=C\:\\Program Files (x86)\\Android\\android-sdk\\ndk\\android-ndk-r14b
sdk.dir=C\:\\Program Files (x86)\\Android\\android-sdk

接下来是各个自定义的cpp文件及头文件：

FFDemux.cpp：
#include "FFDemux.h"
#include "XLog.h"

//打开文件，或者流媒体 rmtp http rtsp
bool FFDemux::Open(const char *url)
{
    XLOGI("Open file %s begin",url);

    return true;
}

//读取一帧数据，数据由调用者清理
XData FFDemux::Read()
{
    XData d;
    return d;
}

FFDemux.h： #ifndef XPLAY_FFDEMUX_H
#define XPLAY_FFDEMUX_H


#include "IDemux.h"

class FFDemux: public IDemux {
public:

    //打开文件，或者流媒体 rmtp http rtsp
    virtual bool Open(const char *url);

    //读取一帧数据，数据由调用者清理
    virtual XData Read();
};


#endif //XPLAY_FFDEMUX_H

IDemux.cpp： #include "IDemux.h"

IDemux.h： #ifndef XPLAY_IDEMUX_H
#define XPLAY_IDEMUX_H

#include "XData.h"
//解封装接口
class IDemux {
public:
    //打开文件，或者流媒体 rmtp http rtsp
    virtual bool Open(const char *url) = 0;

    //读取一帧数据，数据由调用者清理
    virtual XData Read() = 0;

};


#endif //XPLAY_IDEMUX_H

XData.cpp： #include "XData.h"

XData.h： #ifndef XPLAY_XDATA_H
#define XPLAY_XDATA_H


class XData {

};


#endif //XPLAY_XDATA_H

XLog.cpp： #include "XLog.h"

XLog.h： #ifndef XPLAY_XLOG_H
#define XPLAY_XLOG_H

class XLog {

};
#ifdef ANDROID
#include <android/log.h>
#define XLOGD(...) __android_log_print(ANDROID_LOG_DEBUG,"XPlay",__VA_ARGS__)
#define XLOGI(...) __android_log_print(ANDROID_LOG_INFO,"XPlay",__VA_ARGS__)
#define XLOGE(...) __android_log_print(ANDROID_LOG_ERROR,"XPlay",__VA_ARGS__)
#else
#define XLOGD(...) printf("XPlay",__VA_ARGS__)
#define XLOGI(...) printf("XPlay",__VA_ARGS__)
#define XLOGE(...) printf("XPlay",__VA_ARGS__)

#endif



#endif //XPLAY_XLOG_H

以上头文件和cpp文件都存放于cpp目录中

最后编译运行到目标设备中只要有“Open file /sdcard/1080.mp4 begin”信息只要包含于控制台的输出内容中即可（Info级别）。