QT ubuntu下开发视频播放 FFmpeg

ubuntu 安装FFmpeg

T113VideoDemo.pro

#-------------------------------------------------
#
# Project created by QtCreator 2023-07-28T11:45:22
#
#-------------------------------------------------QT       += core guigreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsTARGET = T113VideoDemo
TEMPLATE = app# The following define makes your compiler emit warnings if you use
# any feature of Qt which has been marked as 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 you use 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 6.0.0SOURCES += \main.cpp \mainwindow.cppHEADERS += \mainwindow.hFORMS += \mainwindow.uiINCLUDEPATH += /usr/local/ffmpeg/include \LIBS += /usr/local/ffmpeg/lib/libavcodec.so \/usr/local/ffmpeg/lib/libavdevice.so \/usr/local/ffmpeg/lib/libavfilter.so \/usr/local/ffmpeg/lib/libavformat.so \/usr/local/ffmpeg/lib/libavutil.so \/usr/local/ffmpeg/lib/libpostproc.so \/usr/local/ffmpeg/lib/libswresample.so \/usr/local/ffmpeg/lib/libswscale.so \

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>namespace Ui {
class MainWindow;
}class MainWindow : public QMainWindow
{Q_OBJECTpublic:explicit MainWindow(QWidget *parent = 0);~MainWindow();
private slots:void slotOpenFile();void on_pushButton_clicked();void on_close_clicked();void on_screen_clicked();private:Ui::MainWindow *ui;QString currentFileName;};#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QTime>
#include <QFileDialog>
#include <QScreen>
// 调用FFmpeg的头文件
extern "C"{
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libswscale/swscale.h>
#include <libavutil/imgutils.h>
}
// 延时函数
void delay(int msec){QTime dieTime = QTime::currentTime().addMSecs(msec);while( QTime::currentTime() < dieTime )QCoreApplication::processEvents(QEventLoop::AllEvents, 100);
}MainWindow::MainWindow(QWidget *parent) :QMainWindow(parent),ui(new Ui::MainWindow)
{ui->setupUi(this);this->setWindowTitle("hello");//设置窗口的标题QObject::connect(ui->open,SIGNAL(clicked()),this,SLOT(slotOpenFile()));}MainWindow::~MainWindow()
{delete ui;
}void MainWindow::slotOpenFile()//打开文件键
{currentFileName = QFileDialog::getOpenFileName(this, tr("open-file"), tr(""),tr("Video files(*.rmvb *.rm *.avi *.wmv *.mkv *.asf *.3gp *.mov *.mp4 *.ogv* )"));if( !currentFileName.isEmpty() ){on_pushButton_clicked();}
}void MainWindow::on_pushButton_clicked(){AVFormatContext *pFormatCtx; // 存储音视频封装格式中包含的信息int videoIndex = -1; // 视频帧索引，初始化为-1AVCodecContext *pCodecCtx; // 视频流编码结构AVCodec *pCodec; // 视频解码器AVFrame *pFrame, *pFrameRGB;unsigned char *out_buffer;AVPacket *packet;int ret, got_picture;struct SwsContext *img_convert_ctx; // 主要用于视频图像的转换char file_path[1280] = {0};strcpy(file_path,currentFileName.toUtf8().data());// 注册FFMpeg的库av_register_all();/*** （一）打开音视频流并获取音视频流信息 ***/// 初始化AVFormatContextpFormatCtx = avformat_alloc_context();// 打开音视频流/*avformat_open_input函数*///打开一个文件并解析。可解析的内容包括：视频流、音频流、视频流参数、音频流参数、视频帧索引。//参数一：AVFormatContext **ps, 格式化的上下文（由avformat_alloc_context分配）的指针。//参数二：要打开的流的url,地址最终会存入到AVFormatContext结构体当中。//参数三：指定输入的封装格式。一般传NULL，由FFmpeg自行探测。//参数四：包含AVFormatContext和demuxer私有选项的字典。返回时，此参数将被销毁并替换为包含找不到的选项if (avformat_open_input(&pFormatCtx, file_path, NULL, NULL) != 0){printf("Couldn't open input stream.\n");return;}// 获取音视频流数据信息if (avformat_find_stream_info(pFormatCtx, NULL) < 0){printf("Couldn't find stream information.\n");return;}/*** （二）查找视频流位置以及查找并打开视频解码器 ***/// 查找视频流的起始索引位置（nb_streams表示视音频流的个数）for (int i = 0; i < (int)pFormatCtx->nb_streams; i++){// 查找到视频流时退出循环if (pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) // 判断是否为视频流{videoIndex = i;break;}}if (videoIndex == -1){printf("Didn't find a video stream.\n");return ;}// 查找视频解码器pCodecCtx = pFormatCtx->streams[videoIndex]->codec; // 获取视频流编码结构pCodec = avcodec_find_decoder(pCodecCtx->codec_id);if (pCodec == NULL){printf("Codec not found.\n");return ;}// 打开解码器if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0){printf("Could not open codec.\n");return ;}// 打印视频信息printf("--------------- File Information ----------------\n");av_dump_format(pFormatCtx, 0, file_path, 0); // 此函数打印输入或输出的详细信息printf("-------------------------------------------------\n");/*** （三）视频解码的同时处理图片像素数据 ***/// 创建帧结构，此函数仅分配基本结构空间，图像数据空 间需通过av_malloc分配pFrame = av_frame_alloc();pFrameRGB = av_frame_alloc();// 创建动态内存,创建存储图像数据的空间（av_image_get_buffer_size获取一帧图像需要的大小）out_buffer = (unsigned char *)av_malloc((size_t)av_image_get_buffer_size(AV_PIX_FMT_RGB32, pCodecCtx->width, pCodecCtx->height, 1));// 存储一帧像素数据缓冲区av_image_fill_arrays(pFrameRGB->data, pFrameRGB->linesize, out_buffer,AV_PIX_FMT_RGB32, pCodecCtx->width, pCodecCtx->height, 1);packet = (AVPacket *)av_malloc(sizeof(AVPacket));// 初始化img_convert_ctx结构img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt,pCodecCtx->width, pCodecCtx->height, AV_PIX_FMT_RGB32, SWS_BICUBIC, NULL, NULL, NULL);// av_read_frame读取一帧未解码的数据while (av_read_frame(pFormatCtx, packet) >= 0){// 如果是视频数据if (packet->stream_index == videoIndex){// 解码一帧视频数据ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet);if (ret < 0){printf("Decode Error.\n");return ;}if (got_picture){sws_scale(img_convert_ctx, (const unsigned char* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height,pFrameRGB->data, pFrameRGB->linesize);QImage img((uchar*)pFrameRGB->data[0],pCodecCtx->width,pCodecCtx->height,QImage::Format_RGB32);ui->label->setPixmap(QPixmap::fromImage(img)); // 在label上播放视频图片delay(40);}}av_free_packet(packet);}/*** （四）最后要释放申请的内存空间 ***/sws_freeContext(img_convert_ctx); // 释放一个SwsContextav_frame_free(&pFrameRGB);av_frame_free(&pFrame);avcodec_close(pCodecCtx);avformat_close_input(&pFormatCtx);
}void MainWindow::on_close_clicked(){close();}void MainWindow::on_screen_clicked(){
//    static bool max = false;
//    static QRect location = this->geometry();
//    if (max) {
//        this->setGeometry(location);
//    } else {
//        location = this->geometry();
//        this->setGeometry(qApp->desktop()->availableGeometry());
//    }//    this->setProperty("canMove", max);
//    max = !max;}