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;
-
- @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) {
-
- 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) {
-
-
- }
-
- @Override
- public void surfaceDestroyed(SurfaceHolder holder) {
-
-
- }});
- }
-
- private boolean readYUVFile(byte[] yuvArray,String filename){
- try {
-
- if (Environment.getExternalStorageState().equals(
- Environment.MEDIA_MOUNTED)) {
-
- File sdCardDir = Environment.getExternalStorageDirectory();
-
- 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) {
-
- 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;
- int bufWidth = (mCropWidth + 1) & ~1;
- 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));
-
-
-
-
- CHECK_EQ(0, native_window_set_buffers_geometry(
- mNativeWindow.get(),
- bufWidth,
- bufHeight,
- halFormat));
-
-
- ANativeWindowBuffer *buf;
-
- 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(
- buf->handle, GRALLOC_USAGE_SW_WRITE_OFTEN, bounds, &dst));
-
- if (true){
- size_t dst_y_size = buf->stride * buf->height;
- size_t dst_c_stride = ALIGN(buf->stride / 2, 16);
- size_t dst_c_size = dst_c_stride * buf->height / 2;
-
- memcpy(dst, data, dst_y_size + dst_c_size*2);
- }
-
- 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";
-
-
- 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;
- }
-
-
- 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