QT案例（三）基于QT和opencv的视频播放器

简介

OpenCV(开源的计算机视觉库)是基于BSD协议,因此它可免费用于学术和商业用途。其提供C++,C,Python和Java接口,支持Windows,Linux,Mac OS,iOS和Android。OpenCV致力于高效运算和即时应用开发。因其是用优化的C/C++编写的，故其可以充分利用多核处理优势。并且还启用了OpenSL,它可以利用底层异构计算平台的硬件加速。广泛运用在世界各地,OpenCV拥有超过4.7万人的用户社区和超过1400万的下载次数。从互动艺术、矿山检查、网络地图到先进的机器人技术都有OpenCV的身影。

代码

CMakeLists.txt

cmake_minimum_required(VERSION 3.5)
 
project(player VERSION 0.1 LANGUAGES CXX)
 
set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)
 
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(OpenCV_DIR "/usr/local/include/opencv4")
set(OpenCV_LIBS opencv_core opencv_imgproc opencv_highgui opencv_imgcodecs)
 
find_package(OpenCV REQUIRED)
 
find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Widgets)
find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Widgets)
 
 
set(PROJECT_SOURCES
        main.cpp
        mainwindow.cpp
        mainwindow.h
        mainwindow.ui
)
 
if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)
    qt_add_executable(${PROJECT_NAME}
        MANUAL_FINALIZATION
        ${PROJECT_SOURCES}
    )
# Define target properties for Android with Qt 6 as:
#    set_property(TARGET player APPEND PROPERTY QT_ANDROID_PACKAGE_SOURCE_DIR
#                 ${CMAKE_CURRENT_SOURCE_DIR}/android)
# For more information, see https://doc.qt.io/qt-6/qt-add-executable.html#target-creation
else()
    if(ANDROID)
        add_library(${PROJECT_NAME} SHARED
            ${PROJECT_SOURCES}
        )
# Define properties for Android with Qt 5 after find_package() calls as:
#    set(ANDROID_PACKAGE_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/android")
    else()
        add_executable(${PROJECT_NAME}
            ${PROJECT_SOURCES}
        )
    endif()
endif()
 
include_directories(${OpenCV_INCLUDE_DIRS})
target_link_libraries(${PROJECT_NAME} PRIVATE Qt${QT_VERSION_MAJOR}::Widgets ${OpenCV_LIBS})
 
set_target_properties(${PROJECT_NAME} PROPERTIES
    MACOSX_BUNDLE_GUI_IDENTIFIER my.example.com
    MACOSX_BUNDLE_BUN