简单的多屏播放器示例(vlc+qt)
简单的多屏播放器示例(vlc+qt)
介绍
- 简单的多屏播放器
- 最多同时播放16个视频
- 支持本地文件和rtsp、rtmp等流媒体播放
- VS2015工程，依赖Qt+VLC
- 练手作品
截图
下载
程序：download.csdn.net/detail/u014755412/9908787
源码：github.com/FutaAlice/QtPlayer
代码分析
IMediaPlayer是为规定接口的基类
提供了播放和控制的几个常用函数
其中打开媒体部分拆分为了OpenURL和OpenFile，并在cpp中实现
若为Windows环境，则对QFileDialog获取的路径进行替换
/*******************************************************************
IMediaPlayer.h（接口类）
构造时传入QWidget*
调用OpenFile或OpenURL或Open打开文件并渲染窗体
*******************************************************************/
#ifndef IMEDIAPLAYER_H
#define IMEDIAPLAYER_H
class QWidget;
class IMediaPlayer
{
public:
IMediaPlayer(QWidget* pWidget);
virtual ~IMediaPlayer();
virtual bool OpenFile();
virtual bool OpenURL(const char* url);
virtual bool Open(const char* url) = 0;
virtual bool Play() = 0;
virtual void Pause() = 0;
virtual void Stop() = 0;
virtual void ChangeVolume(int vol) = 0;
protected:
QWidget* m_pWidget;
};
#endif // IMEDIAPLAYER_H
/*******************************************************************
IMediaPlayer.cpp（接口类）
*******************************************************************/
#include "IMediaPlayer.h"
#include <QtWidgets/QWidget>
#include <QtWidgets/qfiledialog.h>
// Windows环境下进行字符替换
static void StrReplace(QString& str)
{
#if defined(Q_OS_MAC) // Mac
#elif defined(Q_OS_UNIX) // Linux
#elif defined(Q_OS_WIN) // Windows
str = str.replace(QRegExp("/"), "\\");
#endif
}
IMediaPlayer::IMediaPlayer(QWidget* pWidget)
: m_pWidget(pWidget)
{
}
IMediaPlayer::~IMediaPlayer()
{
}
bool IMediaPlayer::OpenFile()
{
QString fileOpen = QFileDialog::getOpenFileName(NULL, "Load a file", "~");
if (!fileOpen.isEmpty())
{
StrReplace(fileOpen);
return Open(fileOpen.toUtf8().constData());
}
else
return false;
}
bool IMediaPlayer::OpenURL(const char * url)
{
return Open(url);
}
之后新建一个派生自IMediaPlayer的类：VlcMediaPlayer，
并使用libvlc实现其基类中的纯虚函数实现视频的播放
/*******************************************************************
VlcMediaPlayer.h
使用libvlc实现的IMediaPlayer
构造时传入QWidget*
调用OpenFile或OpenURL或Open打开文件并渲染窗体
例如:
QWidget* pWidget = new QOpenGLWidget();
pWidget->show();
auto player = new VlcMediaPlayer(pWidget);
player->Open("test.hevc");
*******************************************************************/
#ifndef VLCMEDIAPLAYER_H
#define VLCMEDIAPLAYER_H
#include "IMediaPlayer.h"
struct libvlc_media_player_t;
struct libvlc_instance_t;
class VlcMediaPlayer :
public IMediaPlayer
{
public:
VlcMediaPlayer(QWidget* pWidget);
~VlcMediaPlayer();
// 禁用拷贝构造和赋值
VlcMediaPlayer(const VlcMediaPlayer&) = delete;
VlcMediaPlayer& operator=(VlcMediaPlayer&) = delete;
// Control
virtual bool Open(const char* url);
virtual bool Play();
virtual void Pause();
virtual void Stop();
virtual void ChangeVolume(int vol) ;
private:
// 播放器对象
libvlc_media_player_t *m_pVlcPlayer;
private:
// libvlc实例，所有窗体的渲染共用一个
static libvlc_instance_t *s_pVlcInstance;
static unsigned int s_ref;
};
#endif // VLCMEDIAPLAYER_H
/*******************************************************************
VlcMediaPlayer.cpp
libvlc播放视频的实现
*******************************************************************/
#include "VlcMediaPlayer.h"
#include <assert.h>
#include <QtWidgets/QWidget>
# ifdef __cplusplus
extern "C" {
# endif
#include <vlc/vlc.h>
# ifdef __cplusplus
}
# endif
#if defined(Q_OS_MAC) // Mac
// TODO
#elif defined(Q_OS_UNIX) // Linux
#pragma comment(lib, "libvlc.a")
#elif defined(Q_OS_WIN) // Windows
#pragma comment(lib, "libvlc.lib")
#endif
unsigned int VlcMediaPlayer::s_ref = 0;
libvlc_instance_t *VlcMediaPlayer::s_pVlcInstance = NULL;
VlcMediaPlayer::VlcMediaPlayer(QWidget* pWidget)
: IMediaPlayer(pWidget)
, m_pVlcPlayer(NULL)
{
/* Initialize libVLC */
if (0 == s_ref++)
{
s_pVlcInstance = libvlc_new(0, NULL);
if (NULL == s_pVlcInstance)
{
assert(false);
}
}
}
VlcMediaPlayer::~VlcMediaPlayer()
{
if (0 == --s_ref)
{
libvlc_release(s_pVlcInstance);
}
}
bool VlcMediaPlayer::Open(const char *url)
{
/* Stop if something is playing */
Stop();
auto funcOpen = libvlc_media_new_path;
if (QString(url).startsWith("rtsp://") ||
QString(url).startsWith("rtmp://") ||
QString(url).startsWith("rtp://") ||
QString(url).startsWith("tcp://") ||
QString(url).startsWith("udp://") ||
QString(url).startsWith("ftp://") ||
QString(url).startsWith("http://") ||
QString(url).startsWith("https://"))
{
funcOpen = libvlc_media_new_location;
}
/* Create a new Media */
libvlc_media_t *vlcMedia = funcOpen(s_pVlcInstance, url);
/* Fail to open url*/
if (!vlcMedia)
{
return false;
}
if (QString(url).endsWith(".hevc"))
libvlc_media_add_option(vlcMedia, ":demux=hevc");
else if (QString(url).endsWith("rtsp"))
libvlc_media_add_option(vlcMedia, ":rtsp-tcp");
/* Create a new libvlc player */
m_pVlcPlayer = libvlc_media_player_new_from_media(vlcMedia);
/* Release the media */
libvlc_media_release(vlcMedia);
return Play();
}
bool VlcMediaPlayer::Play()
{
/* Integrate the video in the interface */
#if defined(Q_OS_MAC)
libvlc_media_player_set_nsobject(m_pVlcPlayer, (void*)m_pWidget->winId());
#elif defined(Q_OS_UNIX)
libvlc_media_player_set_xwindow(m_pVlcPlayer, m_pWidget->winId());
#elif defined(Q_OS_WIN)
libvlc_media_player_set_hwnd(m_pVlcPlayer, (void*)m_pWidget->winId());
#endif
/* And start playback */
int vlc_ret = libvlc_media_player_play(m_pVlcPlayer);
if (0 == vlc_ret)
return true;
else
return false;
}
void VlcMediaPlayer::Pause()
{
if (m_pVlcPlayer && libvlc_media_player_is_playing(m_pVlcPlayer))
{
libvlc_media_player_pause(m_pVlcPlayer);
}
}
void VlcMediaPlayer::Stop()
{
if (m_pVlcPlayer)
{
/* stop the media player */
libvlc_media_player_stop(m_pVlcPlayer);
/* release the media player */
libvlc_media_player_release(m_pVlcPlayer);
/* Reset application values */
m_pVlcPlayer = NULL;
}
}
void VlcMediaPlayer::ChangeVolume(int vol)
{
if (m_pVlcPlayer)
{
libvlc_audio_set_volume(m_pVlcPlayer, vol);
}
}
界面部分，
响应界面按钮点击的消息和调整窗体大小的消息，
并且调用VlcMediaPlayer添加播放视频的小窗口
/*******************************************************************
QtPlayer.h
*******************************************************************/
#pragma once
#include <QtWidgets/QWidget>
#include "ui_QtPlayer.h"
struct libvlc_media_player_t;
class QtPlayer : public QWidget
{
Q_OBJECT
public:
QtPlayer(QWidget *parent = Q_NULLPTR);
void resizeEvent(QResizeEvent* e);
private slots:
void openFile();
void openURL();
private:
Ui::QtPlayerClass ui;
QWidget* m_pSubWidgets[16];
};
/*******************************************************************
QtPlayer.cpp
*******************************************************************/
#include "QtPlayer.h"
#include "VlcMediaPlayer.h"
QtPlayer::QtPlayer(QWidget *parent)
: QWidget(parent)
{
ui.setupUi(this);
memset(m_pSubWidgets, NULL, sizeof(m_pSubWidgets));
}
void QtPlayer::openFile()
{
int w = width() / 4, h = (height() - 24) / 4;
for (int i = 0; i < 16; ++i)
{
if (m_pSubWidgets[i] == NULL)
{
m_pSubWidgets[i] = new QWidget(this);
auto player = new VlcMediaPlayer(m_pSubWidgets[i]);
// 打开成功
if (player->OpenFile())
{
resizeEvent(NULL);
m_pSubWidgets[i]->show();
}
else
{
delete player;
delete m_pSubWidgets[i];
m_pSubWidgets[i] = NULL;
}
break;
}
}
}
void QtPlayer::resizeEvent(QResizeEvent *e)
{
int w = width() / 4, h = (height() - 24) / 4;
for (int i = 0; i < 16; ++i)
{
if (NULL == m_pSubWidgets[i])
continue;
m_pSubWidgets[i]->resize(QSize(w, h));
m_pSubWidgets[i]->move(QPoint((i % 4) * w, (i / 4) * h));
}
QPoint pos = ui.btnOpenFile->pos();
pos.setY(height() - 24);
ui.btnOpenFile->move(pos);
pos = ui.btnOpenURL->pos();
pos.setY(height() - 24);
ui.btnOpenURL->move(pos);
pos = ui.lineEdit->pos();
pos.setY(height() - 24);
ui.lineEdit->move(pos);
}
void QtPlayer::openURL()
{
int w = width() / 4, h = height() / 4;
for (int i = 0; i < 16; ++i)
{
if (m_pSubWidgets[i] == NULL)
{
m_pSubWidgets[i] = new QWidget(this);
auto player = new VlcMediaPlayer(m_pSubWidgets[i]);
// 打开成功
if (player->OpenURL(ui.lineEdit->text().toUtf8().constData()))
{
resizeEvent(NULL);
m_pSubWidgets[i]->show();
}
else
{
delete player;
delete m_pSubWidgets[i];
m_pSubWidgets[i] = NULL;
}
break;
}
}
}
