基于QML渲染.y4m格式2160p文件（yuv420帧数据）

完整代码链接：y4m解析基于QML渲染.y4m格式2160p文件（yuv420帧数据）-网络游戏文档类资源-CSDN下载

y4m文件格式：YUV4MPEG2 - MultimediaWiki

y4m测试文件下载：Xiph.org :: Derf's Test Media Collection

本例中使用的是：in_to_tree资源

 

man.qml

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.12

Window {
    id: appWin
    visible: true
    width: Screen.width
    height: Screen.height
    flags:Qt.FramelessWindowHint    //无边框

    property var videoW: width
    property var videoH: height
    property var sysFps: 60

    OSDVideoOutput {
        id: localv
        width: videoW
        height: videoH
    }
}

OSDVideoOutput.qml

import QtQuick 2.12
import QtQuick.Controls 2.12
import QtQuick.Controls.Material 2.12
import com.novastar.FrameProvider 1.0
import QtMultimedia 5.4

Rectangle {
    property var localIndex: 0
    property var localIP: ""
    property var mdType: ""
    property var itemDel: 0
    color: Qt.rgba(136/255, 136/255, 136/255, 0.6)

    VideoOutput {
        id: display
        objectName: "display_"+localIP
        anchors.fill: parent
        fillMode : VideoOutput.Stretch
        source: provider
    }

    FrameProvider {
        id: provider
        property var  sys_fps: appWin.sysFps
        objectName: "provider_"+localIP
        uiIndex: localIndex
        fpWidth: 3840
        fpHegit: 2160
        modelType: mdType
        ip: localIP             //最后初始化

        onSys_fpsChanged: {
            provider.setFps(sysFps)
        }

        Component.onCompleted: {
            provider.init()
        }
        Component.onDestruction: {
            provider.release();
        }

        Item {
        id: fps
        width: parent.width
        Text {
            id: curFps
            text: "fps:" + provider.getCurFps()
            font.bold: true
            color: "red"
            font.pixelSize: 18

            Timer {
                interval: 1000
                running: true
                repeat: true
                onTriggered: {
                    curFps.text = "fps:" + provider.getCurFps()
                }
            }
        }
    }
}

.y4m文件头解析

            char bufData[128] = {0};
            char ch = { 0 };
            int index = 0;
            while (indexread(&ch, 1);
                if (ch != '\n')
                {
					bufData[index] = ch;
					index++;
                }
                else
                {
                    break;
                }
            }
            
            std::string strData(bufData);
            qDebug() << bufData;
            std::vector vecResult;
            splitStringByChar(strData, vecResult, ' ');
            std::string strFrameW = vecResult[1].substr(1, std::string::npos);
            std::string strFrameH = vecResult[2].substr(1, std::string::npos);
            iFrameW = atoi(strFrameW.c_str());
            iFrameH = atoi(strFrameH.c_str());
            m_iCurFrameSize = iFrameW * iFrameH * 3 / 2;
            memset(bufData, 0, sizeof(bufData));
			m_fin->read(bufData, sizeof("FRAME"));

.y4m文件帧解析

        len = m_fin->read(m_arrFrameData.data(), m_iCurFrameSize).gcount();
        if (len==0 ||(len > 0 && len != m_iCurFrameSize))
        {
            //不够一帧数据，不渲染，从文件头开始重新读取
            //获取程序当前运行目录
            m_fin->close();
            QString fileName = QCoreApplication::applicationDirPath();
            fileName += QString("/in_to_tree_2160p50.y4m");
            std::string strTestFileName = fileName.toLatin1().data();
            m_fin->open(strTestFileName, std::ios::binary  | std::ios::in);
            if (m_fin->is_open())
            {
                m_fin->seekg(SEEK_SET);    //将指针指向文件起始位置
                //解析y4m文件头
				char ch = { 0 };
				int index = 0;
				while (ch != '\n' && index < sizeof(bufData))
				{
					m_fin->read(&ch, 1);
					bufData[index] = ch;
					index++;
				}

                std::string strData(bufData);
				qDebug() << bufData;
				std::vector vecResult;
				splitStringByChar(strData, vecResult, ' ');
				std::string strFrameW = vecResult[1].substr(1, std::string::npos);
				std::string strFrameH = vecResult[2].substr(1, std::string::npos);
				iFrameW = atoi(strFrameW.c_str());
				iFrameH = atoi(strFrameH.c_str());
                m_iCurFrameSize = iFrameW * iFrameH * 3 / 2;
                //去掉每一帧的标记
				memset(bufData, 0, sizeof(bufData));
                m_fin->read(bufData, sizeof("FRAME"));
            }
        }
        else
        {
            *pData = new unsigned char[m_iCurFrameSize];
            memcpy(*pData, (char*)m_arrFrameData.data(), m_iCurFrameSize);
			m_fin->read(bufData, sizeof("FRAME"));
        }