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1. 完成facade模式的IPlayer并实现Open接口.~1

发布时间：2021-06-12 18:35:07编辑：雪饮阅读（）

 這次呀主要是新增兩個文件，一個頭文件一個對外提供門面接口的程序cpp這樣就實現了對後臺程序模塊對於用戶調用來説是不可見的：

Cpp/IPlayer.h:
#ifndef XPLAY_IPLAYER_H
#define XPLAY_IPLAYER_H


#include "XThread.h"

class IDemux;
class IAudioPlay;
class IVideoView;
class IResample;
class IDecode;


class IPlayer : public XThread
{
public:
    static IPlayer *Get(unsigned char index=0);
    virtual bool Open(const char *path);
    virtual bool Start();
    //是否视频硬解码
    bool isHardDecode = true;


    IDemux *demux = 0;
    IDecode *vdecode = 0;
    IDecode *adecode = 0;
    IResample *resample = 0;
    IVideoView *videoView = 0;
    IAudioPlay *audioPlay = 0;
protected:
    IPlayer(){};
};


#endif //XPLAY_IPLAYER_H
Cpp/IPlayer.cpp:

#include "IPlayer.h"
#include "IDemux.h"
#include "IDecode.h"
#include "IAudioPlay.h"
#include "IVideoView.h"
#include "IResample.h"
#include "XLog.h"

IPlayer *IPlayer::Get(unsigned char index)
{
    static IPlayer p[256];
    return &p[index];
}


bool IPlayer::Open(const char *path)
{

    //解封装
    if(!demux || !demux->Open(path))
    {
        XLOGE("demux->Open %s failed!",path);
        return false;
    }
    //解码 解码可能不需要，如果是解封之后就是原始数据
    if(!vdecode || !vdecode->Open(demux->GetVPara(),isHardDecode))
    {
        XLOGE("vdecode->Open %s failed!",path);
        //return false;
    }
    if(!adecode || !adecode->Open(demux->GetAPara()))
    {
        XLOGE("adecode->Open %s failed!",path);
        //return false;
    }

    //重采样 有可能不需要，解码后或者解封后可能是直接能播放的数据
    XParameter outPara = demux->GetAPara();
    if(!resample || !resample->Open(demux->GetAPara(),outPara))
    {
        XLOGE("resample->Open %s failed!",path);
    }
    return true;
}
bool IPlayer::Start()
{
    return true;
}

對於入口文件cpp/native-lib.cpp那就是重新調整下調用流程以及清理下之前的那些測試代碼： #include <jni.h>
#include <string>
#include <android/native_window_jni.h>

#include "FFDemux.h"
#include "XLog.h"
#include "FFDecode.h"
#include "XEGL.h"
#include "XShader.h"
#include "IVideoView.h"
#include "GLVideoView.h"
#include "FFResample.h"
#include "IAudioPlay.h"
#include "SLAudioPlay.h"
#include "IPlayer.h"


IVideoView *view = NULL;
extern "C"
JNIEXPORT
jint JNI_OnLoad(JavaVM *vm,void *res)
{
    FFDecode::InitHard(vm);


    ///////////////////////////////////
    ///测试用代码

    IDemux *de = new FFDemux();
    //de->AddObs(tobs);
    //de->Open("/sdcard/1080.mp4");

    IDecode *vdecode = new FFDecode();
    //vdecode->Open(de->GetVPara(), true);
    //vdecode->Open(de->GetVPara(), true);

    IDecode *adecode = new FFDecode();
    //adecode->Open(de->GetAPara());
    de->AddObs(vdecode);
    de->AddObs(adecode);

    view = new GLVideoView();
    vdecode->AddObs(view);

    IResample *resample = new FFResample();
    //XParameter outPara = de->GetAPara();

    //resample->Open(de->GetAPara(),outPara);
    adecode->AddObs(resample);

    IAudioPlay *audioPlay = new SLAudioPlay();

    //audioPlay->StartPlay(outPara);
    resample->AddObs(audioPlay);

    IPlayer::Get()->demux = de;
    IPlayer::Get()->adecode = adecode;
    IPlayer::Get()->vdecode = vdecode;
    IPlayer::Get()->videoView = view;
    IPlayer::Get()->resample = resample;
    IPlayer::Get()->audioPlay = audioPlay;


    IPlayer::Get()->Open("/sdcard/v1080.mp4");


    //de->Start();
    //vdecode->Start();
    //adecode->Start();



    return JNI_VERSION_1_4;
}



extern "C"
JNIEXPORT jstring

JNICALL
Java_com_example_xplay_MainActivity_stringFromJNI(
        JNIEnv *env,
        jobject /* this */) {
    std::string hello = "Hello from C++";

    //XLOGI("S begin!");
    //XSleep(3000);
    //XLOGI("S end!");
    //return env->NewStringUTF(hello.c_str());


    //XSleep(3000);
    //de->Stop();
    /*for(;;)
    {
        XData d = de->Read();
        XLOGI("Read data size is %d",d.size);


    }*/

    return env->NewStringUTF(hello.c_str());
}
extern "C"
JNIEXPORT void JNICALL
Java_com_example_xplay_XPlay_InitView(JNIEnv *env, jobject instance, jobject surface) {

    // TODO
    ANativeWindow *win = ANativeWindow_fromSurface(env,surface);
    view->SetRender(win);
    //XEGL::Get()->Init(win);
    //XShader shader;
    //shader.Init();


}

對於綫程這塊來説，那麽這次就要依賴返回結果來做判斷了，不能像之前那樣直接void返回類型，這樣是沒有辦法判斷的，或者說非一般做法，一般做法都是boolean判斷。所以cpp/XThread.cpp: #include "XThread.h"
#include "XLog.h"

#include <thread>
using namespace std;
void XSleep(int mis)
{
    chrono::milliseconds du(mis);
    this_thread::sleep_for(du);
}
//启动线程
bool XThread::Start()
{
    isExit = false;
    thread th(&XThread::ThreadMain,this);
    th.detach();
    return true;
}
void XThread::ThreadMain()
{
    isRuning = true;
    XLOGI("线程函数进入");
    Main();
    XLOGI("线程函数退出");
    isRuning = false;
}


//通过控制isExit安全停止线程（不一定成功）
void XThread::Stop()
{XLOGI("Stop 停止线程begin!");
    isExit = true;
    for(int i = 0; i < 200; i++)
    {
        if(!isRuning)
        {
            XLOGI("Stop 停止线程成功!");
            return;
        }
        XSleep(1);
    }
    XLOGI("Stop 停止线程超时!");

}

那麽同樣的頭文件也需要聲明一下cpp/XThread.h: #ifndef XPLAY_XTHREAD_H
#define XPLAY_XTHREAD_H

//sleep 毫秒
void XSleep(int mis);

//c++ 11 线程库
class XThread
{
public:
    //启动线程
    virtual bool Start();

    //通过控制isExit安全停止线程（不一定成功）
    virtual void Stop();

    //入口主函数
    virtual void Main() {}

protected:
    bool isExit = false;
    bool isRuning = false;
private:
    void ThreadMain();

};


#endif //XPLAY_XTHREAD_H

接下來就是需要在cpp/CMakeLists.txt中引入剛才新增的IPlayer接口： # 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
            IVideoView
            GLVideoView
            XTexture
            XEGL
            XShader
            FFResample
            IResample
            SLAudioPlay
            IAudioPlay
            IPlayer
        )

# 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} )

然後這次運行結果呢？其實不算太明顯：