qt中用opengl播放yuv420视频流

#include "CPlayWidget.h" #include <QOpenGLTexture> #include <QOpenGLBuffer> #include <QMouseEvent> CPlayWidget::CPlayWidget(QWidget *parent) : QOpenGLWidget(parent) { textureUniformY = 0; textureUniformU = 0; textureUniformV = 0; id_y = 0; id_u = 0; id_v = 0; m_pBufYuv420p = NULL; m_pVSHader = NULL; m_pFSHader = NULL; m_pShaderProgram = NULL; m_pTextureY = NULL; m_pTextureU = NULL; m_pTextureV = NULL; m_pYuvFile = NULL; m_nVideoH = 0; m_nVideoW = 0; } CPlayWidget::~CPlayWidget() { // fclose(m_pYuvFile); delete [] m_pBufYuv420p; } void CPlayWidget::initializeGL() { if(NULL == m_pYuvFile) { //打开yuv视频文件 注意修改文件路径 m_pYuvFile = fopen("D:\\Desktop\\xinjian\\OpenGL\\OpenGL\\176_144.yuv", "rb"); //根据yuv视频数据的分辨率设置宽高,demo当中是1080p，这个地方要注意跟实际数据分辨率对应上 m_nVideoW = 176; m_nVideoH = 144; } //申请内存存一帧yuv图像数据,其大小为分辨率的1.5倍 initializeOpenGLFunctions(); glEnable(GL_DEPTH_TEST); //现代opengl渲染管线依赖着色器来处理传入的数据 //着色器：就是使用openGL着色语言(OpenGL Shading Language, GLSL)编写的一个小函数, // GLSL是构成所有OpenGL着色器的语言,具体的GLSL语言的语法需要读者查找相关资料 //初始化顶点着色器 对象 m_pVSHader = new QOpenGLShader(QOpenGLShader::Vertex, this); //顶点着色器源码 const char *vsrc = "attribute vec4 vertexIn; \ attribute vec2 textureIn; \ varying vec2 textureOut; \ void main(void) \ { \ gl_Position = vertexIn; \ textureOut = textureIn; \ }"; //编译顶点着色器程序 bool bCompile = m_pVSHader->compileSourceCode(vsrc); if(!bCompile) { } //初始化片段着色器 功能gpu中yuv转换成rgb m_pFSHader = new QOpenGLShader(QOpenGLShader::Fragment, this); //片段着色器源码 const char *fsrc = "varying vec2 textureOut; \ uniform sampler2D tex_y; \ uniform sampler2D tex_u; \ uniform sampler2D tex_v; \ void main(void) \ { \ vec3 yuv; \ vec3 rgb; \ yuv.x = texture2D(tex_y, textureOut).r; \ yuv.y = texture2D(tex_u, textureOut).r - 0.5; \ yuv.z = texture2D(tex_v, textureOut).r - 0.5; \ rgb = mat3( 1, 1, 1, \ 0, -0.39465, 2.03211, \ 1.13983, -0.58060, 0) * yuv; \ gl_FragColor = vec4(rgb, 1); \ }"; //将glsl源码送入编译器编译着色器程序 bCompile = m_pFSHader->compileSourceCode(fsrc); if(!bCompile) { } #define PROGRAM_VERTEX_ATTRIBUTE 0 #define PROGRAM_TEXCOORD_ATTRIBUTE 1 //创建着色器程序容器 m_pShaderProgram = new QOpenGLShaderProgram; //将片段着色器添加到程序容器 m_pShaderProgram->addShader(m_pFSHader); //将顶点着色器添加到程序容器 m_pShaderProgram->addShader(m_pVSHader); //绑定属性vertexIn到指定位置ATTRIB_VERTEX,该属性在顶点着色源码其中有声明 m_pShaderProgram->bindAttributeLocation("vertexIn", ATTRIB_VERTEX); //绑定属性textureIn到指定位置ATTRIB_TEXTURE,该属性在顶点着色源码其中有声明 m_pShaderProgram->bindAttributeLocation("textureIn", ATTRIB_TEXTURE); //链接所有所有添入到的着色器程序 m_pShaderProgram->link(); //激活所有链接 m_pShaderProgram->bind(); //读取着色器中的数据变量tex_y, tex_u, tex_v的位置,这些变量的声明可以在 //片段着色器源码中可以看到 textureUniformY = m_pShaderProgram->uniformLocation("tex_y"); textureUniformU = m_pShaderProgram->uniformLocation("tex_u"); textureUniformV = m_pShaderProgram->uniformLocation("tex_v"); // 顶点矩阵 static const GLfloat vertexVertices[] = { -1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f, 1.0f, 1.0f, }; //纹理矩阵 static const GLfloat textureVertices[] = { 0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, }; //设置属性ATTRIB_VERTEX的顶点矩阵值以及格式 glVertexAttribPointer(ATTRIB_VERTEX, 2, GL_FLOAT, 0, 0, vertexVertices); //设置属性ATTRIB_TEXTURE的纹理矩阵值以及格式 glVertexAttribPointer(ATTRIB_TEXTURE, 2, GL_FLOAT, 0, 0, textureVertices); //启用ATTRIB_VERTEX属性的数据,默认是关闭的 glEnableVertexAttribArray(ATTRIB_VERTEX); //启用ATTRIB_TEXTURE属性的数据,默认是关闭的 glEnableVertexAttribArray(ATTRIB_TEXTURE); //分别创建y,u,v纹理对象 m_pTextureY = new QOpenGLTexture(QOpenGLTexture::Target2D); m_pTextureU = new QOpenGLTexture(QOpenGLTexture::Target2D); m_pTextureV = new QOpenGLTexture(QOpenGLTexture::Target2D); m_pTextureY->create(); m_pTextureU->create(); m_pTextureV->create(); //获取返回y分量的纹理索引值 id_y = m_pTextureY->textureId(); //获取返回u分量的纹理索引值 id_u = m_pTextureU->textureId(); //获取返回v分量的纹理索引值 id_v = m_pTextureV->textureId(); glClearColor(0.3,0.3,0.3,0.0);//设置背景色 //qDebug("addr=%x id_y = %d id_u=%d id_v=%d\n", this, id_y, id_u, id_v); connect(&timer, SIGNAL(timeout()), this, SLOT(on_timeout())); timer.setInterval(25); timer.start(); } void CPlayWidget::resizeGL(int w, int h) { if(h == 0)// 防止被零除 { h = 1;// 将高设为1 } //设置视口 glViewport(0,0, w,h); } void CPlayWidget::paintGL() { int nLen = m_nVideoW*m_nVideoH*3/2; if(NULL == m_pBufYuv420p) { m_pBufYuv420p = new unsigned char[nLen]; qDebug(" Len=%d width=%d height=%d\n", nLen, m_nVideoW, m_nVideoH); } //将一帧yuv图像读到内存中 if(NULL == m_pYuvFile) { qFatal("read yuv file err.may be path is wrong!\n"); return; } // m_pBufYuv420p+=position; // position += nLen; fread(m_pBufYuv420p, 1, nLen, m_pYuvFile); //加载y数据纹理 //激活纹理单元GL_TEXTURE0 glActiveTexture(GL_TEXTURE0); //使用来自y数据生成纹理 glBindTexture(GL_TEXTURE_2D, id_y); //使用内存中m_pBufYuv420p数据创建真正的y数据纹理 glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, m_nVideoW, m_nVideoH, 0, GL_RED, GL_UNSIGNED_BYTE, m_pBufYuv420p); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); //加载u数据纹理 glActiveTexture(GL_TEXTURE1);//激活纹理单元GL_TEXTURE1 glBindTexture(GL_TEXTURE_2D, id_u); glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, m_nVideoW/2, m_nVideoH/2, 0, GL_RED, GL_UNSIGNED_BYTE, (char*)m_pBufYuv420p+m_nVideoW*m_nVideoH); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); //加载v数据纹理 glActiveTexture(GL_TEXTURE2);//激活纹理单元GL_TEXTURE2 glBindTexture(GL_TEXTURE_2D, id_v); glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, m_nVideoW/2, m_nVideoH/2, 0, GL_RED, GL_UNSIGNED_BYTE, (char*)m_pBufYuv420p+m_nVideoW*m_nVideoH*5/4); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);