下面我们开始动手撸一个抖音APP，根据实际需求，会分为下面几步
- openGL基础
- 显示摄像头
- 录制视频
- 添加功能：设置录制视频速度
- 添加功能：各种特效
这里是第二部分，openGL显示摄像头
1. 权限
<!--openGL版本-->
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />
<!--摄像头权限-->
<uses-permission android:name="android.permission.CAMERA" />
<!--录音权限-->
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<!--写入文件权限-->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
2. 初始化画布
public class CaptureView extends GLSurfaceView implements GLSurfaceView.Renderer {
// Render类
private GLCameraDrawer glCameraDrawer;
// 相机控制类
private CameraHelper cameraHelper;
// 要打开的摄像头的ID
public static int cameraId = Camera.CameraInfo.CAMERA_FACING_BACK;
public CaptureView(Context context) {
super(context);
init();
}
public CaptureView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
private void init() {
// 初始化
glCameraDrawer = new GLCameraDrawer(getContext());
// 创建摄像头资源
cameraHelper = new CameraHelper();
//设置EGL版本
setEGLContextClientVersion(2);
// 设置Render
setRenderer(this);
/**
* 1. 连续渲染
* 2. 按需渲染
* 這裏设置按需渲染
*/
setRenderMode(RENDERMODE_WHEN_DIRTY);
}
//=============================Render回调=========================================
@Override
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
// 初始化render
glCameraDrawer.onSurfaceCreated(gl, config);
// 打开摄像头
cameraHelper.open(cameraId);
// 获取预览宽高
Point point = cameraHelper.getPreviewSize();
glCameraDrawer.setDataSize(point.x, point.y);
// 设置预览控件
cameraHelper.setPreviewTexture(glCameraDrawer.getSurfaceTexture());
// 渲染回调
glCameraDrawer.getSurfaceTexture().setOnFrameAvailableListener(new SurfaceTexture.OnFrameAvailableListener() {
@Override
public void onFrameAvailable(SurfaceTexture surfaceTexture) {
requestRender();
}
});
// 开始预览画面
cameraHelper.preview();
}
@Override
public void onSurfaceChanged(GL10 gl, int width, int height) {
// 界面改变
GLES20.glViewport(0, 0, width, height);
glCameraDrawer.setViewSize(width, height);
}
@Override
public void onDrawFrame(GL10 gl) {
// 画出界面
glCameraDrawer.onDrawFrame(gl);
}
@Override
public void onPause() {
super.onPause();
// 关闭摄像头预览
cameraHelper.close();
}
3. 初始化相机控制类
public class CameraHelper {
private static final String TAG = "dds_CameraHelper";
private Config mConfig;
private Camera mCamera;
private CameraSizeComparator sizeComparator;
private Point mPreSize;
public CameraHelper() {
this.mConfig = new Config();
mConfig.minPreviewWidth = 720;
mConfig.minPictureWidth = 720;
mConfig.rate = 1.778f;
sizeComparator = new CameraSizeComparator();
}
// 打开相机
public boolean open(int cameraId) {
mCamera = Camera.open(cameraId);
if (mCamera != null) {
// 获取合适的图片尺寸和预览尺寸
Camera.Parameters param = mCamera.getParameters();
Camera.Size picSize = getPropPictureSize(param.getSupportedPictureSizes(), mConfig.rate, mConfig.minPictureWidth);
Camera.Size preSize = getPropPreviewSize(param.getSupportedPreviewSizes(), mConfig.rate, mConfig.minPreviewWidth);
param.setPictureSize(picSize.width, picSize.height);
param.setPreviewSize(preSize.width, preSize.height);
mCamera.setParameters(param);
Camera.Size pre = param.getPreviewSize();
Log.d(TAG, "preview height:" + pre.height + ",width:" + pre.width);
// 注意，这里写反的话会导致界面被压缩
mPreSize = new Point(pre.height, pre.width);
return true;
}
return false;
}
// 开始预览
public boolean preview() {
if (mCamera != null) {
mCamera.startPreview();
}
return true;
}
// 关闭摄像头
public boolean close() {
if (mCamera != null) {
try {
mCamera.stopPreview();
mCamera.release();
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
return true;
}
// 设置渲染的控件SurfaceTexture
public void setPreviewTexture(SurfaceTexture texture) {
if (mCamera != null) {
try {
mCamera.setPreviewTexture(texture);
} catch (IOException e) {
e.printStackTrace();
}
}
}
// 获取预览的宽高
public Point getPreviewSize() {
return mPreSize;
}
private Camera.Size getPropPreviewSize(List<Camera.Size> list, float th, int minWidth) {
Collections.sort(list, sizeComparator);
int i = 0;
for (Camera.Size s : list) {
if ((s.height >= minWidth) && equalRate(s, th)) {
break;
}
i++;
}
if (i == list.size()) {
i = 0;
}
return list.get(i);
}
private Camera.Size getPropPictureSize(List<Camera.Size> list, float th, int minWidth) {
Collections.sort(list, sizeComparator);
int i = 0;
for (Camera.Size s : list) {
if ((s.height >= minWidth) && equalRate(s, th)) {
break;
}
i++;
}
if (i == list.size()) {
i = 0;
}
return list.get(i);
}
private boolean equalRate(Camera.Size s, float rate) {
float r = (float) (s.width) / (float) (s.height);
if (Math.abs(r - rate) <= 0.03) {
return true;
} else {
return false;
}
}
private class CameraSizeComparator implements Comparator<Camera.Size> {
public int compare(Camera.Size lhs, Camera.Size rhs) {
if (lhs.height == rhs.height) {
return 0;
} else if (lhs.height > rhs.height) {
return 1;
} else {
return -1;
}
}
}
class Config {
float rate; //宽高比
int minPreviewWidth;
int minPictureWidth;
}
}
4. 初始化GLCameraDrawer
public class GLCameraDrawer implements GLSurfaceView.Renderer {
private SurfaceTexture mSurfaceTexture;
// OseFilter 使用openGL渲染画面
private OseFilter baseFilter;
private float[] mtx = new float[16];
private Context mContext;
public GLCameraDrawer(Context context) {
baseFilter = new OseFilter();
mContext = context;
}
public SurfaceTexture getSurfaceTexture() {
return mSurfaceTexture;
}
//------------------------------------------------------------------------------
private int width, height;
private int dataWidth, dataHeight;
@Override
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
// 通过openGL创建一个纹理id
int texture = createTextureID();
// 初始化SurfaceTexture
mSurfaceTexture = new SurfaceTexture(texture);
// 注意：必须在gl线程操作openGL
baseFilter.create(mContext);
baseFilter.setTextureId(texture);
}
/**
* 画布发生了改变
*/
@Override
public void onSurfaceChanged(GL10 gl, int width, int height) {
setViewSize(width, height);
// baseFilter.setMatrix(mtx);
}
/**
* 开始画画吧
*/
@Override
public void onDrawFrame(GL10 gl) {
if (mSurfaceTexture != null) {
// 更新纹理图像为从图像流中提取的最近一帧
mSurfaceTexture.updateTexImage();
}
// 绘制纹理
baseFilter.draw();
}
//------------------------------------------------------------------------------
public void setViewSize(int width, int height) {
this.width = width;
this.height = height;
calculateMatrix();
}
public void setDataSize(int dataWidth, int dataHeight) {
this.dataWidth = dataWidth;
this.dataHeight = dataHeight;
calculateMatrix();
}
private void calculateMatrix() {
getShowMatrix(mtx, this.dataWidth, this.dataHeight, this.width, this.height);
if (CaptureView.cameraId == 1) {
// 前置摄像头旋转90度并
flip(mtx, true, false);
rotate(mtx, 90);
} else {
// 前置旋转270度
rotate(mtx, 270);
}
baseFilter.setMatrix(mtx);
}
private static void getShowMatrix(float[] matrix, int imgWidth, int imgHeight, int viewWidth, int viewHeight) {
if (imgHeight > 0 && imgWidth > 0 && viewWidth > 0 && viewHeight > 0) {
float sWhView = (float) viewWidth / viewHeight;
float sWhImg = (float) imgWidth / imgHeight;
float[] projection = new float[16];
float[] camera = new float[16];
if (sWhImg > sWhView) {
Matrix.orthoM(projection, 0, -sWhView / sWhImg, sWhView / sWhImg, -1, 1, 1, 3);
} else {
Matrix.orthoM(projection, 0, -1, 1, -sWhImg / sWhView, sWhImg / sWhView, 1, 3);
}
Matrix.setLookAtM(camera, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0);
Matrix.multiplyMM(matrix, 0, projection, 0, camera, 0);
}
}
private static float[] rotate(float[] m, float angle) {
Matrix.rotateM(m, 0, angle, 0, 0, 1);
return m;
}
private static float[] flip(float[] m, boolean x, boolean y) {
if (x || y) {
Matrix.scaleM(m, 0, x ? -1 : 1, y ? -1 : 1, 1);
}
return m;
}
//通过openGL创建一个纹理id
private int createTextureID() {
int[] texture = new int[1];
// 创建纹理，生成你要操作的纹理对象的索引
GLES20.glGenTextures(texture.length, texture, 0);
// 绑定纹理，告诉OpenGL下面代码中对2D纹理的任何设置都是针对索引为0的纹理的
GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, texture[0]);
// glTexParameterF 是设置纹理贴图的参数属性
GLES20.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR);
GLES20.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR);
// OpenGL——纹理过滤函数glTexParameterI() 确定如何把纹理象素映射成像素.
GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GL10.GL_TEXTURE_WRAP_S, GL10.GL_CLAMP_TO_EDGE);
GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GL10.GL_TEXTURE_WRAP_T, GL10.GL_CLAMP_TO_EDGE);
return texture[0];
}
}
5. 开始编写OseFilter
public class OseFilter {
private static final String TAG = "dds_Filter";
protected int mProgram; // 程序句柄
protected int mHPosition; // 顶点坐标句柄
protected int mHCoord; // 纹理坐标句柄
protected int mHMatrix; // 总变换矩阵句柄
protected int mHTexture; // 默认纹理贴图句柄 片元句柄
protected FloatBuffer mVertexBuffer; // 顶点坐标Buffer
protected FloatBuffer mTextureBuffer; // 纹理坐标Buffer
//单位矩阵
public static final float[] OM = new float[]{
1, 0, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1
};
private int textureId = 0;
private float[] matrix = Arrays.copyOf(OM, 16);
private int mHCoordMatrix;
private float[] mCoordMatrix = Arrays.copyOf(OM, 16);
//顶点坐标
private float pos[] = {
-1.0f, 1.0f,
-1.0f, -1.0f,
1.0f, 1.0f,
1.0f, -1.0f,
};
//纹理坐标
private float[] coord = {
0.0f, 0.0f,
0.0f, 1.0f,
1.0f, 0.0f,
1.0f, 1.0f,
};
public OseFilter() {
//创建一个数据缓冲区
//4个点 每个点两个数据(x,y) 数据类型float
mVertexBuffer = ByteBuffer.allocateDirect(4 * 2 * 4)
.order(ByteOrder.nativeOrder())
.asFloatBuffer();
mVertexBuffer.clear();
mVertexBuffer.put(pos);
mVertexBuffer.position(0);
// 纹理 buffer
mTextureBuffer = ByteBuffer.allocateDirect(4 * 2 * 4)
.order(ByteOrder.nativeOrder())
.asFloatBuffer();
mTextureBuffer.clear();
mTextureBuffer.put(coord);
mTextureBuffer.position(0);
}
public final void setTextureId(int textureId) {
this.textureId = textureId;
}
public void setMatrix(float[] matrix) {
this.matrix = matrix;
}
public final void create(Context context) {
// 读出顶点着色器:vertexSource 和 片源着色器:fragmentSource
String vertexSource = OpenUtils.readRawTextFile(context, R.raw.camera_vertex);
String fragmentSource = OpenUtils.readRawTextFile(context, R.raw.camera_frag);
mProgram = createOpenGLProgram(vertexSource, fragmentSource);
// 顶点
mHPosition = GLES20.glGetAttribLocation(mProgram, "vPosition");
mHCoord = GLES20.glGetAttribLocation(mProgram, "vCoord");
mHMatrix = GLES20.glGetUniformLocation(mProgram, "vMatrix");
// 片元
mHTexture = GLES20.glGetUniformLocation(mProgram, "vTexture");
//自定义
mHCoordMatrix = GLES20.glGetUniformLocation(mProgram, "vCoordMatrix");
}
public void draw() {
onClear();
// 使用着色器程序
onUseProgram();
// 设置其他扩展数据
onSetExpandData();
// 绑定默认纹理
onBindTexture();
onDraw();
}
/**
* 清除画布
*/
protected void onClear() {
GLES20.glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);
}
/**
* 使用着色器程序
*/
protected void onUseProgram() {
GLES20.glUseProgram(mProgram);
}
/**
* 设置其他扩展数据
*/
protected void onSetExpandData() {
//3、变换矩阵
GLES20.glUniformMatrix4fv(mHMatrix, 1, false, matrix, 0);
GLES20.glUniformMatrix4fv(mHCoordMatrix, 1, false, mCoordMatrix, 0);
}
/**
* 绑定默认纹理
*/
protected void onBindTexture() {
// 激活图层
// GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
// // 图像数据
// GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureId);
// //传递参数 0：需要和纹理层GL_TEXTURE0对应
// GLES20.glUniform1i(mHTexture, 0);
GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, textureId);
GLES20.glUniform1i(mHTexture, 0);
}
/**
* 启用顶点坐标和纹理坐标进行绘制
*/
protected void onDraw() {
// 1、将顶点数据传入，确定形状
GLES20.glVertexAttribPointer(mHPosition, 2, GLES20.GL_FLOAT, false, 0, mVertexBuffer);
//传了数据之后 激活
GLES20.glEnableVertexAttribArray(mHPosition);
//2、将纹理坐标传入，采样坐标
GLES20.glVertexAttribPointer(mHCoord, 2, GLES20.GL_FLOAT, false, 0, mTextureBuffer);
GLES20.glEnableVertexAttribArray(mHCoord);
//参数传完了 通知opengl 画画 从第0点开始 共4个点
GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
GLES20.glDisableVertexAttribArray(mHPosition);
GLES20.glDisableVertexAttribArray(mHCoord);
}
/**
* 生成OpenGL Program
*
* @param vertexSource 顶点着色器代码
* @param fragmentSource 片元着色器代码
* @return 生成的OpenGL Program，如果为0，则表示创建失败
*/
private static int createOpenGLProgram(String vertexSource, String fragmentSource) {
// 1. 创建顶点着色器
int vertex = loadShader(GLES20.GL_VERTEX_SHADER, vertexSource);
if (vertex == 0) {
Log.e(TAG, "loadShader vertex failed");
return 0;
}
// 2.创建片元着色器
int fragment = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentSource);
if (fragment == 0) {
Log.e(TAG, "loadShader fragment failed");
return 0;
}
// 3、创建着色器程序
int program = GLES20.glCreateProgram();
if (program != 0) {
// 把着色器塞到程序当中
GLES20.glAttachShader(program, vertex);
GLES20.glAttachShader(program, fragment);
// 链接着色器
GLES20.glLinkProgram(program);
int[] linkStatus = new int[1];
// 获得程序是否配置成功
GLES20.glGetProgramiv(program, GLES20.GL_LINK_STATUS, linkStatus, 0);
if (linkStatus[0] != GLES20.GL_TRUE) {
Log.e(TAG, "Could not link program:" + GLES20.glGetProgramInfoLog(program));
GLES20.glDeleteProgram(program);
program = 0;
}
}
//因为已经塞到着色器程序中了，所以删了没关系
GLES20.glDeleteShader(vertex);
GLES20.glDeleteShader(fragment);
return program;
}
/**
* 加载着色器
*
* @param type 加载着色器类型
* @param shaderCode 加载着色器的代码
*/
private static int loadShader(int type, String shaderCode) {
//1. 根据type创建顶点着色器或者片元着色器
int shader = GLES20.glCreateShader(type);
//2. 将着色器的代码加入到着色器中
GLES20.glShaderSource(shader, shaderCode);
//3. 编译着色器
GLES20.glCompileShader(shader);
return shader;
}
其中顶点着色器和片元着色器如下
camera_vertex
attribute vec4 vPosition;
attribute vec2 vCoord;
uniform mat4 vMatrix;
uniform mat4 vCoordMatrix;
varying vec2 textureCoordinate;
void main(){
gl_Position = vMatrix*vPosition;
textureCoordinate = (vCoordMatrix*vec4(vCoord,0,1)).xy;
}
camera_frag
#extension GL_OES_EGL_image_external : require
precision mediump float;
varying vec2 textureCoordinate;
uniform samplerExternalOES vTexture;
void main(){
gl_FragColor = texture2D(vTexture,textureCoordinate);
}
读取文件
public static String readRawTextFile(Context context, int rawId) {
InputStream is = context.getResources().openRawResource(rawId);
BufferedReader br = new BufferedReader(new InputStreamReader(is));
String line;
StringBuilder sb = new StringBuilder();
try {
while ((line = br.readLine()) != null) {
sb.append(line);
sb.append("\n");
}
} catch (Exception e) {
e.printStackTrace();
}
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
return sb.toString();
}
代码
本教程已发布到release，可下载相应的release的代码
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