一、环境介绍

操作系统:  win10 64位

QT版本:  QT5.12.6

编译器:   MinGW 32

FFMPEG版本: 4.2.2

win32下使用FFMPEG 4.2.2库下载地址： download.csdn.net/download/xi…

完整项目源码下载地址(下载就可编译运行,不懂可以私信): download.csdn.net/download/xi…

二、功能介绍

基于ffmpeg设计的视频播放器，只解码处理了图像，没有处理音频。写这个例子方便在其他平台移植播放视频。

2.1 xxx.pro文件

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    ReverseDecodThread.cpp \
    VideoFrameDisplay.cpp \
    main.cpp \
    widget.cpp

HEADERS += \
    ReverseDecodThread.h \
    VideoFrameDisplay.h \
    widget.h

FORMS += \
    widget.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

win32
{
    message('运行win32版本')
    INCLUDEPATH+=C:/FFMPEG/ffmpeg_x86_4.2.2/include
    LIBS+=C:/FFMPEG/ffmpeg_x86_4.2.2/bin/av*
    LIBS+=C:/FFMPEG/ffmpeg_x86_4.2.2/bin/sw*
    LIBS+=C:/FFMPEG/ffmpeg_x86_4.2.2/bin/pos*
}

2.2 ReverseDecodThread.cpp

2.3 ReverseDecodThread

#ifndef VIDEO_PLAY_H
#define VIDEO_PLAY_H

#include <QThread>
#include <qdebug.h>
#include <QImage>
#include <QDateTime>

extern "C" {
#include <libavutil/opt.h>
#include <libavutil/mem.h>
#include <libavutil/fifo.h>
#include <libavutil/pixfmt.h>
#include <libavutil/log.h>
#include <libavutil/opt.h>
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libswscale/swscale.h>
#include <libswresample/swresample.h>
#include <libavfilter/avfilter.h>
#include <libavfilter/buffersrc.h>
#include <libavfilter/buffersink.h>
}


//视频音频解码线程
class ReverseDecodThread: public QThread
{
    Q_OBJECT
public:

    //构造函数
    ReverseDecodThread();
    ~ReverseDecodThread();
	char m_MediaFile[1024];
	int m_run; //1表示运行 0表示停止 2表示暂停
    double m_n64CurrentSeekPos = 0;  //当前seek位置
	bool is_CurrentSeekPos = 0; //1需要跳转 0不需要

	void SetSate(int run);
	int GetSate();
	void SetSeekPos(qint64 pos);
	void PausePlay();
	void StopPlay();
	void LogSend(QString text);

    //加载视频文件
    int LoadVideoFile(QString media);

    //释放内存
    void FreeRAM();

protected:
    void run();
	int StartPlay();
signals:
    void sig_getCurrentTime(double Sec, double total_Sec);
    void VideoDataOutput(QImage); //输出信号
private:
    int video_width=0;
    int video_height=0;
    AVFormatContext *format_ctx=nullptr;
    int video_stream_index = -1;
    AVFrame *RGB24_pFrame = nullptr;
    AVFrame *SRC_VIDEO_pFrame= nullptr;
    uint8_t *out_buffer_rgb= nullptr;
    struct SwsContext *img_convert_ctx=nullptr;  //用于解码后的视频格式转换

    double video_clock_tmp;

    qint64 play_base_time=0;
};
#endif // VIDEO_PLAY_H

2.3 效果