Android4.2顯示yuv資料

#define LOG_TAG "ShowYUV"

#include "utils/Log.h"

#include <binder/ProcessState.h>

#include <cutils/properties.h> // for property_get

#include <binder/IPCThreadState.h>

#include <media/IStreamSource.h>

#include <media/mediaplayer.h>

#include <media/stagefright/foundation/ADebug.h>

#include <media/stagefright/foundation/AMessage.h>

#include <media/stagefright/DataSource.h>

#include <media/stagefright/MPEG2TSWriter.h>

#include <media/stagefright/MediaExtractor.h>

#include <media/stagefright/MediaSource.h>

#include <media/stagefright/MetaData.h>

#include "include/SoftwareRenderer.h"

#include <binder/IServiceManager.h>

#include <media/IMediaPlayerService.h>

#include <gui/ISurfaceComposer.h>

#include <gui/SurfaceComposerClient.h>

#include <fcntl.h>

#include <ui/DisplayInfo.h>

using namespace android;

bool getYV12Data(const char *path,unsigned char * pYUVData,int size){

    FILE *fp = fopen(path,"rb");

    if(fp == NULL){

        printf("read %s fail !!!!!!!!!!!!!!!!!!!\n",path);

        return false;

    }

    fread(pYUVData,size,1,fp);

    fclose(fp);

    return true;

}

int main(void){

    // set up the thread-pool

    sp<ProcessState> proc(ProcessState::self());

    ProcessState::self()->startThreadPool();

    // create a client to surfaceflinger

    sp<SurfaceComposerClient> client = new SurfaceComposerClient();

    sp<IBinder> dtoken(SurfaceComposerClient::getBuiltInDisplay(

            ISurfaceComposer::eDisplayIdMain));

    DisplayInfo dinfo;

    //擷取螢幕的寬高等資訊

    status_t status = SurfaceComposerClient::getDisplayInfo(dtoken, &dinfo);

    printf("w=%d,h=%d,xdpi=%f,ydpi=%f,fps=%f,ds=%f\n", 

        dinfo.w, dinfo.h, dinfo.xdpi, dinfo.ydpi, dinfo.fps, dinfo.density);

    if (status)

        return -1;

    //建立surface,有些系統可能報錯，dinfo.w和dinfo.h也可以寫成固定值

    sp<SurfaceControl> surfaceControl = client->createSurface(String8("showYUV"),

            dinfo.w, dinfo.h, PIXEL_FORMAT_RGBA_8888, 0);

    printf("[%s][%d]\n",__FILE__,__LINE__);

    int width,height;

    width = 320;

    height = 240;

    int size = width * height * 3/2;

    unsigned char *data = new unsigned char[size];

    char path[] = "/data/10.yuv";

    getYV12Data(path,data,size);//get yuv data from file;

    SurfaceComposerClient::openGlobalTransaction();

    surfaceControl->setLayer(100000);//設定Z坐标

    surfaceControl->setPosition(100, 100);//以左上角為(0,0)設定顯示位置

    surfaceControl->setSize(width, height);//設定視訊顯示大小

    SurfaceComposerClient::closeGlobalTransaction();

    sp<Surface> mSurface = surfaceControl->getSurface();

    printf("[%s][%d]\n",__FILE__,__LINE__);

    sp<MetaData> meta = new MetaData;

    meta->setInt32(kKeyWidth, width);

    meta->setInt32(kKeyHeight, height);

    meta->setInt32(kKeyColorFormat, HAL_PIXEL_FORMAT_YV12);

    //setRect不要也可以，我也不知道設定了有什麼用，原理是什麼，但是設定，參數一定要正确

//    meta->setRect(

//                    kKeyCropRect,

//                    0,//left

//                    0,//top

//                    width -1,//right

//                    height -1);//bottom

    printf("[%s][%d]\n",__FILE__,__LINE__);

    SoftwareRenderer* sr = new SoftwareRenderer(mSurface,meta);//初始化

    printf("[%s][%d]\n",__FILE__,__LINE__);

    sr->render(data,size,NULL);//關鍵在這裡，顯示到螢幕上

    printf("[%s][%d]\n",__FILE__,__LINE__);

    IPCThreadState::self()->joinThreadPool();//可以保證畫面一直顯示，否則瞬間消失

    IPCThreadState::self()->stopProcess();

    delete[] data;

    return 0;

}

參照别人的代碼修改一下，是可以在4.2裝置上顯示的。