Android使用surface直接显示yuv数据（三）

    在本文中，Java创建UI和关节JNI经营层surface直接显示yuv数据（yv12）。发展环境Android 4.4，驰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;
	
	@Override
	protected 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(){

			@Override
			public void surfaceCreated(SurfaceHolder holder) {
				// TODO Auto-generated method stub
				Log.d(TAG,"surfaceCreated");
				byte[]yuvArray = new byte[size];
				readYUVFile(yuvArray, FILE_NAME);
				nativeSetVideoSurface(holder.getSurface());
				nativeShowYUV(yuvArray,width,height);
			}

			@Override
			public void surfaceChanged(SurfaceHolder holder, int format,
					int width, int height) {
				// TODO Auto-generated method stub
				
			}

			@Override
			public void surfaceDestroyed(SurfaceHolder holder) {
				// TODO Auto-generated method stub
				
			}});
	}
	
	private boolean readYUVFile(byte[] yuvArray,String filename){
		try {
            // 假设手机插入了SD卡，并且应用程序具有訪问SD的权限
            if (Environment.getExternalStorageState().equals(
                    Environment.MEDIA_MOUNTED)) {
                // 获取SD卡相应的存储文件夹
                File sdCardDir = Environment.getExternalStorageDirectory();
                // 获取指定文件相应的输入流
                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)採用动态注冊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??

? //非常重要,配置宽高和和指定颜色空间yuv420 //假设这里不配置好，以下deque_buffer仅仅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;//描写叙述buffer //申请一块空暇的图形缓冲区 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 jboolean nativeSetVideoSurface(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 void nativeShowYUV(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 methods static 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.cpp
	
LOCAL_SHARED_LIBRARIES := \
	libcutils \
	libutils \
	libbinder \
    libui \
    libgui \
	libandroid_runtime \
	libstagefright_foundation
	
LOCAL_MODULE:= libshowYUV

LOCAL_MODULE_TAGS := tests

include $(BUILD_SHARED_LIBRARY)

生成的so文件拷贝到Java项目里 与src并列的libs/armeabi文件夹下。没有就手动创建文件夹，

这样Eclipse会自己主动把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

版权声明：本文博客原创文章。博客，未经同意，不得转载。