Android4.2顯示yuv數據

/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


#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;
    //獲取屏幕的寬高等信息
    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;
    //創建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);
             
/*************************get yuv data from file;****************************************/         
    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;
/*********************配置surface*******************************************************************/
    SurfaceComposerClient::openGlobalTransaction();
    surfaceControl->setLayer(100000);//設定Z座標
    surfaceControl->setPosition(100, 100);//以左上角爲(0,0)設定顯示位置
    surfaceControl->setSize(width, height);//設定視頻顯示大小
    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);
    /*指定yuv格式，支持以下yuv格式
     * OMX_COLOR_FormatYUV420Planar:
     * OMX_TI_COLOR_FormatYUV420PackedSemiPlanar:
     * HAL_PIXEL_FORMAT_YV12:
     * 其他的貌似會轉換成OMX_COLOR_Format16bitRGB565
     */
    meta->setInt32(kKeyColorFormat, HAL_PIXEL_FORMAT_YV12);
    //setRect不要也可以，我也不知道設置了有什麼用，原理是什麼，但是設置，參數一定要正確
//    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);//關鍵在這裏，顯示到屏幕上
     
    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;

}

參照別人的代碼修改一下，是可以在4.2設備上顯示的。