Android用surface直接显示yuv数据（三）

    本文用Java创建UI并联合JNI层操作surface来直接显示yuv数据（yv12），开发环境为Android 4.4，全志A23平台。

package com.example.myyuvviewer;import java.io.File;import java.io.FileInputStream;import android.app.Activity;import android.os.Bundle;import android.os.Environment;import android.util.Log;import android.view.Surface;import android.view.SurfaceHolder;import android.view.SurfaceHolder.Callback;import android.view.SurfaceView;public class MainActivity extends Activity {final private String TAG = "MyYUVViewer";final private String FILE_NAME = "yuv_320_240.yuv";private int width = 320;private int height = 240;private int size = width * height * 3/2;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);nativeTest();SurfaceView surfaceview = (SurfaceView) findViewById(R.id.surfaceView);SurfaceHolder holder = surfaceview.getHolder();holder.addCallback(new Callback(){@Overridepublic void surfaceCreated(SurfaceHolder holder) {// TODO Auto-generated method stubLog.d(TAG,"surfaceCreated");byte[]yuvArray = new byte[size];readYUVFile(yuvArray, FILE_NAME);nativeSetVideoSurface(holder.getSurface());nativeShowYUV(yuvArray,width,height);}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format,int width, int height) {// TODO Auto-generated method stub}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {// TODO Auto-generated method stub}});}private boolean readYUVFile(byte[] yuvArray,String filename){try {            // 如果手机插入了SD卡，而且应用程序具有访问SD的权限            if (Environment.getExternalStorageState().equals(                    Environment.MEDIA_MOUNTED)) {                // 获取SD卡对应的存储目录                File sdCardDir = Environment.getExternalStorageDirectory();                // 获取指定文件对应的输入流                FileInputStream fis = new FileInputStream(                        sdCardDir.getCanonicalPath() +"/" + filename);                fis.read(yuvArray, 0, size);                fis.close();                return true;            } else {                return false;            }        }catch (Exception e) {            e.printStackTrace();            return false;        }}private native void nativeTest();private native boolean nativeSetVideoSurface(Surface surface);private native void nativeShowYUV(byte[] yuvArray,int width,int height);static {        System.loadLibrary("showYUV");    }}

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"      android:layout_width="fill_parent"      android:layout_height="fill_parent"      android:orientation="vertical" >        <SurfaceView          android:id="@+id/surfaceView"          android:layout_width="fill_parent"          android:layout_height="360dp" />         </LinearLayout>

JNI层，showYUV.cpp(libshowyuv.so)采用动态注册JNI函数的方法.

#include <jni.h>#include <android_runtime/AndroidRuntime.h>#include <android_runtime/android_view_Surface.h>#include <gui/Surface.h>#include <assert.h>#include <utils/Log.h>#include <JNIHelp.h>#include <media/stagefright/foundation/ADebug.h>#include <ui/GraphicBufferMapper.h>#include <cutils/properties.h>using namespace android;static sp<Surface> surface;static int ALIGN(int x, int y) {    // y must be a power of 2.    return (x + y - 1) & ~(y - 1);}static void render(        const void *data, size_t size, const sp<ANativeWindow> &nativeWindow,int width,int height) {ALOGE("[%s]%d",__FILE__,__LINE__);    sp<ANativeWindow> mNativeWindow = nativeWindow;    int err;int mCropWidth = width;int mCropHeight = height;int halFormat = HAL_PIXEL_FORMAT_YV12;//颜色空间    int bufWidth = (mCropWidth + 1) & ~1;//按2对齐    int bufHeight = (mCropHeight + 1) & ~1;CHECK_EQ(0,            native_window_set_usage(            mNativeWindow.get(),            GRALLOC_USAGE_SW_READ_NEVER | GRALLOC_USAGE_SW_WRITE_OFTEN            | GRALLOC_USAGE_HW_TEXTURE | GRALLOC_USAGE_EXTERNAL_DISP));    CHECK_EQ(0,            native_window_set_scaling_mode(            mNativeWindow.get(),            NATIVE_WINDOW_SCALING_MODE_SCALE_CROP));    // Width must be multiple of 32???//很重要,配置宽高和和指定颜色空间yuv420//如果这里不配置好，下面deque_buffer只能去申请一个默认宽高的图形缓冲区    CHECK_EQ(0, native_window_set_buffers_geometry(                mNativeWindow.get(),                bufWidth,                bufHeight,                halFormat));ANativeWindowBuffer *buf;//描述buffer//申请一块空闲的图形缓冲区    if ((err = native_window_dequeue_buffer_and_wait(mNativeWindow.get(),            &buf)) != 0) {        ALOGW("Surface::dequeueBuffer returned error %d", err);        return;    }    GraphicBufferMapper &mapper = GraphicBufferMapper::get();    Rect bounds(mCropWidth, mCropHeight);    void *dst;    CHECK_EQ(0, mapper.lock(//用来锁定一个图形缓冲区并将缓冲区映射到用户进程                buf->handle, GRALLOC_USAGE_SW_WRITE_OFTEN, bounds, &dst));//dst就指向图形缓冲区首地址    if (true){        size_t dst_y_size = buf->stride * buf->height;        size_t dst_c_stride = ALIGN(buf->stride / 2, 16);//1行v/u的大小        size_t dst_c_size = dst_c_stride * buf->height / 2;//u/v的大小                memcpy(dst, data, dst_y_size + dst_c_size*2);//将yuv数据copy到图形缓冲区    }    CHECK_EQ(0, mapper.unlock(buf->handle));    if ((err = mNativeWindow->queueBuffer(mNativeWindow.get(), buf,            -1)) != 0) {        ALOGW("Surface::queueBuffer returned error %d", err);    }    buf = NULL;}static void nativeTest(){ALOGE("[%s]%d",__FILE__,__LINE__);}static jbooleannativeSetVideoSurface(JNIEnv *env, jobject thiz, jobject jsurface){ALOGE("[%s]%d",__FILE__,__LINE__);surface = android_view_Surface_getSurface(env, jsurface);if(android::Surface::isValid(surface)){ALOGE("surface is valid ");}else {ALOGE("surface is invalid ");return false;}ALOGE("[%s][%d]\n",__FILE__,__LINE__);return true;}static voidnativeShowYUV(JNIEnv *env, jobject thiz,jbyteArray yuvData,jint width,jint height){ALOGE("width = %d,height = %d",width,height);jint len = env->GetArrayLength(yuvData);ALOGE("len = %d",len);jbyte *byteBuf = env->GetByteArrayElements(yuvData, 0);render(byteBuf,len,surface,width,height);}static JNINativeMethod gMethods[] = {    {"nativeTest",       "()V",    (void *)nativeTest},{"nativeSetVideoSurface","(Landroid/view/Surface;)Z", (void *)nativeSetVideoSurface},{"nativeShowYUV","([BII)V",(void *)nativeShowYUV},};static const char* const kClassPathName = "com/example/myyuvviewer/MainActivity";// This function only registers the native methodsstatic int register_com_example_myyuvviewer(JNIEnv *env){ALOGE("[%s]%d",__FILE__,__LINE__);    return AndroidRuntime::registerNativeMethods(env,                kClassPathName, gMethods, NELEM(gMethods));}jint JNI_OnLoad(JavaVM* vm, void* reserved){ALOGE("[%s]%d",__FILE__,__LINE__);    JNIEnv* env = NULL;    jint result = -1;    if (vm->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK) {        ALOGE("ERROR: GetEnv failed\n");        goto bail;    }    assert(env != NULL);ALOGE("[%s]%d",__FILE__,__LINE__);   if (register_com_example_myyuvviewer(env) < 0) {        ALOGE("ERROR: MediaPlayer native registration failed\n");        goto bail;    }    /* success -- return valid version number */    result = JNI_VERSION_1_4;bail:    return result;}

Android.mk

LOCAL_PATH:= $(call my-dir)include $(CLEAR_VARS)LOCAL_SRC_FILES:= \showYUV.cppLOCAL_SHARED_LIBRARIES := \libcutils \libutils \libbinder \    libui \    libgui \libandroid_runtime \libstagefright_foundationLOCAL_MODULE:= libshowYUVLOCAL_MODULE_TAGS := testsinclude $(BUILD_SHARED_LIBRARY)

生成的so文件复制到Java项目里 与src并列的libs/armeabi目录下，没有就手动创建目录，

这样Eclipse会自动把so库打包进apk。

转载请注明出处：http://blog.csdn.net/tung214/article/details/37762487

yuvdata下载地址：点击打开链接