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文章目录
前言一、下载VLC库二、VLC使用介绍三、成品演示四、开始开发UI设计封装VLC库UI与CVLC类结合初始化播放按钮暂停按钮进度条响应函数音量响应函数播放速率响应事件定时器响应事件
前言
如果对学习C/C++有兴趣,可以看看这篇文章哦:C/C++教程 C/C++开发方向之一就是音视频,本文以当前流行的VLC开源库为基础,开发一个视频播放器。 最新库的下载地址点这里 代码演示: typedef long long ssize_t; //目前需要定义,否则编译失败 #include //添加头文件 #include #include #pragma comment(lib,"libvlc.lib") //添加libvlc.lib库 #pragma comment(lib,"libvlccore.lib") //添加libvlccore.lib库 std::string toUTF8(std::wstring data) { int len=WideCharToMultiByte(CP_UTF8,0,data.data(),-1,0,0,0,0); std::string s; s.resize(len+1); WideCharToMultiByte(CP_UTF8,0,data.data(),-1,(LPSTR)s.data(),len+1, 0, 0); return s; } int main() { libvlc_instance_t* vlc_ins = libvlc_new(0,NULL); //创建vlc实例 std::string path = toUTF8(L"测试视频.mp4"); //转码为UTF-8 libvlc_media_t* media = libvlc_media_new_path(vlc_ins,path.data());//为视频创建播放对象 libvlc_media_player_t * player=libvlc_media_player_new_from_media(media); //创建播放对象 do { int ret=libvlc_media_player_play(player); //进行播放 if (ret == -1) break; Sleep(1000); //休眠1秒,给时间缓存,否则数据可能获取失败 libvlc_time_t tm = libvlc_media_player_get_length(player); //获得视频长度 printf("%02lld:%02lld:%02lld\n", tm / 3600000, tm / 60000 % 60, tm /1000 % 60); int width=libvlc_video_get_width(player); //获取视频宽度 int hight=libvlc_video_get_height(player); //获取视频高度 printf("width=%d height=%d\n",width,hight); getchar(); //等待一次按键 libvlc_media_player_pause(player); //暂停视频播放 getchar(); libvlc_media_player_play(player);//视频继续播放 getchar(); libvlc_media_player_stop(player); //停止视频播放 getchar(); } while (0); libvlc_media_player_release(player); //释放播放实例 libvlc_media_release(media); //释放媒体实例 libvlc_release(vlc_ins); //释放VLC实例 }几点说明: vlc库默认为utf-8编码,如果文件名中有中文,必须先转化为UTF-8编码do{}while(0)结构可能觉得奇怪,这是为了中途出错,直接跳出循环,释放实例获取的视频长度以微秒作为单位名字叫测试视频.mp4放在了当前项目目录下,如果在其它目录,需要指定完整路径![]() 运行结果: 视频正常播放 三、成品演示
项目下载可点击这里 四、开始开发功能需求:播放,暂停/继续,停止,速率,进度显示,跳转位置,地址输入等功能 主要模块:封装VLC库函数为一个简单易用的类 界面:采用MFC的对话框项目 选择MFC项目 注意,除了应用程序类型必须选基于对话框,其它可随意
CVlc.h #pragma once #include typedef long long ssize_t; #include struct MediaSize { int width; int hight; MediaSize(int _width,int _hight) { width = _width; hight = _hight; } }; class CVlc { private: libvlc_instance_t* m_instance; libvlc_media_t* m_media; libvlc_media_player_t* m_player; HWND m_hWnd; private: //转换编码为utf-8 std::string ToUTF8(const std::wstring& str); public: CVlc(); ~CVlc(); //加载媒体 bool LoadMedia(const std::wstring &path); //设置播放窗口 void SetHWnd(HWND hWnd); //播放 bool Play(); //暂停 bool Pause(); //停止 bool Stop(); //获取播放进度 float GetPosition(); //设置播放进度 void SetPosition(float pos); //获取音量 int GetVolume(); //设置音量 void SetVolume(int volume); //获取媒体时长 int GetLenth(); //设置播放速率 bool SetRate(float rate); //获取媒体宽高 MediaSize GetMediaInfo(); };CVlc.cpp #include "pch.h" #include "CVlc.h" std::string CVlc::ToUTF8(const std::wstring& str) { int len = WideCharToMultiByte(CP_UTF8, 0, str.data(), -1, 0, 0, 0, 0); std::string s; s.resize(len + 1); WideCharToMultiByte(CP_UTF8, 0, str.data(), -1, (LPSTR)s.data(), len + 1, 0, 0); return s; } CVlc::CVlc() { m_instance = libvlc_new(0, NULL); m_media = NULL; m_player = NULL; m_hWnd = NULL; } CVlc::~CVlc() { if (m_player != NULL) { libvlc_media_player_release(m_player); m_player = NULL; } if (m_media != NULL) { libvlc_media_release(m_media); m_media = NULL; } if (m_instance != NULL) { libvlc_release(m_instance); m_instance = NULL; } } bool CVlc::LoadMedia(const std::wstring& path) { if (m_instance == NULL) return false; std::string s=ToUTF8(path); if (m_media != NULL) { libvlc_media_release(m_media); m_media = NULL; } m_media=libvlc_media_new_location(m_instance,s.data()); if (m_media == NULL) return false; if (m_player != NULL) { libvlc_media_player_release(m_player); m_player = NULL; } m_player=libvlc_media_player_new_from_media(m_media); if (m_player == NULL) return false; return true; } void CVlc::SetHWnd(HWND hWnd) { m_hWnd = hWnd; } bool CVlc::Play() { if (m_player == NULL) return false; if (m_hWnd != NULL) { libvlc_media_player_set_hwnd(m_player, m_hWnd); } int ret = libvlc_media_player_play(m_player); return ret == 0; } bool CVlc::Pause() { if (m_player == NULL) return false; libvlc_media_player_pause(m_player); return true; } bool CVlc::Stop() { if (m_player == NULL) return false; libvlc_media_player_stop(m_player); return true; } float CVlc::GetPosition() { if (m_player == NULL) return false; return libvlc_media_player_get_position(m_player); } void CVlc::SetPosition(float pos) { if (m_player == NULL) return; libvlc_media_player_set_position(m_player,pos); } int CVlc::GetVolume() { if (m_player == NULL) return 0; return libvlc_audio_get_volume(m_player); } void CVlc::SetVolume(int volume) { if (m_player == NULL) return; libvlc_audio_set_volume(m_player,volume); } int CVlc::GetLenth() { if (m_player == NULL) return -1; libvlc_time_t tm=libvlc_media_player_get_length(m_player); if (tm == -1) return -1; return tm/1000; } bool CVlc::SetRate(float rate) { if (m_player == NULL) return false; return 0==libvlc_media_player_set_rate(m_player,rate); } MediaSize CVlc::GetMediaInfo() { if (m_player == NULL) return MediaSize(0,0); return MediaSize( libvlc_video_get_width(m_player), libvlc_video_get_height(m_player) ); } UI与CVLC类结合全局变量: |
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