Android用surface直接显示yuv数据（三）

最新推荐文章于 2021-05-29 04:13:58 发布

jsn_ze

最新推荐文章于 2021-05-29 04:13:58 发布

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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 {
// 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

[html] view plain copy

<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.

[cpp] view plain copy

#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 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;
}