您当前的位置： 首页 > 学无止境 > 心得笔记 网站首页心得笔记

7. 完成音频重采样IResample模块的处理功能~1

发布时间：2021-06-11 17:48:59编辑：雪饮阅读（）

 完成Iresample模块，首先在入口cpp/native-lib.cpp中打开Iresample（初始化）：

#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"

class TestObs:public IObserver
{
public:
    void Update(XData d)
    {
        //XLOGI("TestObs Update data size is %d",d.size);
    }
};


IVideoView *view = NULL;
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());

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

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

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

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

    IResample *resample = new FFResample();
    resample->Open(de->GetAPara());
    adecode->AddObs(resample);


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

    //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();


}
然后为了解决上次出现的错误error: no member named 'Alloc' in 'XData'，需要在cpp/XData.h中声明布尔类型的Alloc函数：

#ifndef XPLAY_XDATA_H
#define XPLAY_XDATA_H
enum XDataType
{
    AVPACKET_TYPE = 0,
    UCHAR_TYPE = 1
};


struct XData
{
    int type = 0;
    unsigned char *data = 0;
    unsigned char *datas[8] = {0};
    int size = 0;
    bool isAudio = false;
    int width = 0;
    int height = 0;
    bool Alloc(int size,const char *data=0);
    void Drop();
};


#endif //XPLAY_XDATA_H

然后需要在cpp/XData.cpp中实现Alloc方法： #include "XData.h"
extern "C"{
#include <libavformat/avformat.h>
}

bool XData::Alloc(int size,const char *d)
{
    Drop();
    type = UCHAR_TYPE;
    if(size <=0)return false;
    this->data = new unsigned char[size];
    if(!this->data) return false;
    if(d)
    {
        memcpy(this->data,d,size);
    }
    return true;
}
void XData::Drop()
{
    if(!data) return;
    if(type == AVPACKET_TYPE)
        av_packet_free((AVPacket **)&data);
    else
        delete data;
    data = 0;
    size = 0;
}

这里同样是用老师的v1080.mp4能够成功