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libVLC 视频缩放

作者：weixin_40725706 | 2024-03-29 22:09:29

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libVLC 视频缩放

libvlc是一个常用的开源多媒体框架，它可以用来播放和处理各种类型的音频和视频文件。如果想要缩放视频，可以通过libvlc提供的API来实现。

  1. //设置视频的缩放比例。
  2. libvlc_video_set_scale()

以下是如何使用 libVLC 设置视频缩放的基本步骤：

  1. #include <vlc/vlc.h>
  2.  
  3. int main(int argc, char* argv[]) {
  4.     libvlc_instance_t *vlcInstance;
  5.     libvlc_media_player_t *mediaPlayer;
  6.     libvlc_media_t *media;
  7.  
  8.     // 初始化 libVLC
  9.     vlcInstance = libvlc_new(0, NULL);
  10.  
  11.     // 创建一个媒体对象
  12.     media = libvlc_media_new_path(vlcInstance, "path_to_your_video_file.mp4");
  13.  
  14.     // 创建一个媒体播放器
  15.     mediaPlayer = libvlc_media_player_new_from_media(media);
  16.  
  17.     // 设置视频缩放选项
  18.     libvlc_video_set_scale(mediaPlayer, 0.5); // 缩放比例为 0.5，即将视频缩小一半
  19.  
  20.     // 设置视频输出窗口
  21.     libvlc_media_player_set_hwnd(mediaPlayer, (void*)your_window_handle);
  22.  
  23.     // 播放视频
  24.     libvlc_media_player_play(mediaPlayer);
  25.  
  26.     // 等待用户输入
  27.     getchar();
  28.  
  29.     // 释放资源
  30.     libvlc_media_player_release(mediaPlayer);
  31.     libvlc_media_release(media);
  32.     libvlc_release(vlcInstance);
  33.  
  34.     return 0;
  35. }

以下是VLC播放器中使用的视频缩放，我们仿照这个做一个界面。 

以下是做出来的效果图。

首先做缩放菜单： 

  1. 	//.h
  2.     //缩放
  3. 	QMenu *m_scaleMenu = nullptr;
  4. 	QAction *m_scale1_4 = nullptr;
  5. 	QAction *m_scale1_2 = nullptr;
  6. 	QAction *m_scale1_1 = nullptr;
  7. 	QAction *m_scale2_1 = nullptr;
  8.  
  9. 	QActionGroup *m_scaleGroup = nullptr;
  10. 	QAction *m_preScale = nullptr;
  11.  
  12.     //.cpp
  13.     //设置缩放菜单
  14. 	m_scaleMenu = new QMenu(this);
  15. 	m_scaleAction->setMenu(m_scaleMenu);
  16.  
  17. 	m_scale1_4 = m_scaleMenu->addAction("1:4 四分之一");
  18. 	m_scale1_2 = m_scaleMenu->addAction("1:2 二分之一");
  19. 	m_scale1_1 = m_scaleMenu->addAction(QIcon(":/image/images/point.png"),"1:1 原始");
  20. 	m_scale2_1 = m_scaleMenu->addAction("2:1 双倍");
  21.  
  22. 	m_scaleGroup = new QActionGroup(this);
  23. 	m_scaleGroup->addAction(m_scale1_4);
  24. 	m_scaleGroup->addAction(m_scale1_2);
  25. 	m_scaleGroup->addAction(m_scale1_1);
  26. 	m_scaleGroup->addAction(m_scale2_1);
  27.  
  28. 	m_preScale = m_scale1_1;
  29.  
  30. 	connect(m_scaleGroup, &QActionGroup::triggered, this, &showWidget::slotScaleActionTriggered);

接受槽函数的响应事件：

  1. void showWidget::slotScaleActionTriggered(QAction *action)
  2. {
  3. 	if (!vlc_mediaPlayer)
  4. 		return;
  5.  
  6. 	if (action == m_scale1_4)
  7. 		libvlc_video_set_scale(vlc_mediaPlayer, 0.25);
  8. 	else if (action == m_scale1_2)
  9. 		libvlc_video_set_scale(vlc_mediaPlayer, 0.5);
  10. 	else if (action == m_scale1_1)
  11. 		libvlc_video_set_scale(vlc_mediaPlayer, 1);
  12. 	else if (action == m_scale2_1)
  13. 		libvlc_video_set_scale(vlc_mediaPlayer, 2);
  14.  
  15. 	action->setIcon(QIcon(":/image/images/point.png"));
  16. 	m_preScale->setIcon(QIcon());
  17. 	m_preScale = action;
  18. }

设置鼠标右键弹出菜单：重写鼠标点击事件，弹出菜单。

首先设置libvlc忽略鼠标事件libvlc_video_set_mouse_input(vlc_mediaPlayer, 0);

再重写鼠标事件：

  1. void showWidget::mousePressEvent(QMouseEvent *event)
  2. {
  3.     switch (event->button())
  4.     {
  5.     case Qt::RightButton:
  6.         //this->setWindowState(Qt::WindowMinimized);
  7.         m_menu->exec(event->globalPos());
  8.         break;
  9.     default:
  10.         QWidget::mousePressEvent(event);
  11.     }
  12. }

完整代码：

头文件。

  1. #pragma once
  2.  
  3. #include <QtWidgets/QWidget>
  4. #include "ui_showWidget.h"
  5. #include <QMenu>
  6. #include <QActionGroup>
  7. #include <vlc/vlc.h>
  8. #include <QDebug>
  9. #include <QFileDialog>
  10. #include <QThread>
  11. #include <QMouseEvent>
  12. #include <QKeyEvent>
  13.  
  14. enum Rate
  15. {
  16. 	Rate2X,
  17. 	Rate1_5X,
  18. 	Rate1_25X,
  19. 	Rate1_0X,
  20. 	Rate0_75X,
  21. 	Rate0_5X
  22. };
  23.  
  24. class showWidget : public QWidget
  25. {
  26.     Q_OBJECT
  27.  
  28. public:
  29.     showWidget(QWidget *parent = nullptr);
  30.     ~showWidget();
  31.  
  32. protected:
  33. 	virtual void mousePressEvent(QMouseEvent *event);
  34. 	virtual void mouseDoubleClickEvent(QMouseEvent *event);
  35. 	virtual void keyPressEvent(QKeyEvent *event);
  36.  
  37. private slots:
  38. 	void slotOpenFile();
  39. 	void slotPlay();
  40. 	void slotPause();
  41. 	void slotStop();
  42. 	void slotValueChanged(int value);
  43. 	void slotCurrentIndexChanged(int index);
  44. 	void slotActionTriggered(QAction *action);
  45. 	void slotCropActionTriggered(QAction *action);
  46. 	void slotScaleActionTriggered(QAction *action);
  47.  
  48. private:
  49. 	//事件处理回调
  50. 	static void vlcEvents(const libvlc_event_t *ev, void *param);
  51.  
  52. 	//初始化menu
  53. 	void initMenu();
  54.  
  55. private:
  56.     Ui::showWidgetClass ui;
  57.  
  58. private:
  59. 	libvlc_instance_t *vlc_base = nullptr;
  60. 	libvlc_media_t *vlc_media = nullptr;
  61. 	libvlc_media_player_t *vlc_mediaPlayer = nullptr;
  62.  
  63. 	QList<float> m_lstRate;
  64.  
  65. 	QMenu *m_menu = nullptr;
  66. 	QAction *m_video = nullptr;
  67.  
  68. 	QAction *m_scaleAction = nullptr;	//缩放
  69. 	QAction *m_aspectRatioAction = nullptr;	//宽高比
  70. 	QAction *m_cropAction = nullptr;	//裁剪
  71.  
  72. 	QMenu *m_videoMenu = nullptr;
  73.  
  74. 	//宽高比
  75. 	QMenu *m_aspectRatioMenu = nullptr;
  76. 	QAction *m_default = nullptr;
  77. 	QAction *m_16_9 = nullptr;
  78. 	QAction *m_4_3 = nullptr;
  79. 	QAction *m_1_1 = nullptr;
  80. 	QAction *m_16_10 = nullptr;
  81. 	QAction *m_2_21_1 = nullptr;
  82. 	QAction *m_2_35_1= nullptr;
  83. 	QAction *m_2_38_1 = nullptr;
  84. 	QAction *m_5_4 = nullptr;
  85.  
  86. 	QActionGroup *m_group = nullptr;
  87. 	QAction *m_preAspectRatio = nullptr;
  88. 	//宽高比
  89. 	//裁剪
  90. 	QMenu *m_cropMenu = nullptr;
  91. 	QAction *m__cropDefault = nullptr;
  92. 	QAction *m__crop16_10 = nullptr;
  93. 	QAction *m__crop16_9 = nullptr;
  94. 	QAction *m__crop4_3 = nullptr;
  95. 	QAction *m__crop1_85_1 = nullptr;
  96. 	QAction *m__crop2_21_1 = nullptr;
  97. 	QAction *m__crop2_35_1 = nullptr;
  98. 	QAction *m__crop2_39_1 = nullptr;
  99. 	QAction *m__crop5_3 = nullptr;
  100. 	QAction *m__crop5_4 = nullptr;
  101. 	QAction *m__crop1_1 = nullptr;
  102.  
  103. 	QActionGroup *m_cropGroup = nullptr;
  104. 	QAction *m_preCrop= nullptr;
  105. 	//裁剪
  106.  
  107. 	//缩放
  108. 	QMenu *m_scaleMenu = nullptr;
  109. 	QAction *m_scale1_4 = nullptr;
  110. 	QAction *m_scale1_2 = nullptr;
  111. 	QAction *m_scale1_1 = nullptr;
  112. 	QAction *m_scale2_1 = nullptr;
  113.  
  114. 	QActionGroup *m_scaleGroup = nullptr;
  115. 	QAction *m_preScale = nullptr;
  116. 	//缩放
  117.  
  118. 	char *m_defalutRate = nullptr;
  119. 	char *m_defalutCrop = nullptr;
  120. 	float m_defalutScale = 0;
  121. };

cpp文件。 

  1. #include "showWidget.h"
  2. #include <QTimer>
  3. #include <QTime>
  4.  
  5. #pragma execution_character_set("utf-8")
  6.  
  7. showWidget::showWidget(QWidget *parent)
  8.     : QWidget(parent)
  9. {
  10.     ui.setupUi(this);
  11.  
  12. 	this->setWindowTitle("视频播放器");
  13.  
  14. 	ui.cbxRate->setCurrentIndex(Rate1_0X);
  15.  
  16. 	m_lstRate << 2.0 << 1.5 << 1.25 << 1.0 << 0.75 << 0.5;
  17.  
  18. 	initMenu();
  19.  
  20. 	ui.btnOpen->setFocusPolicy(Qt::NoFocus);
  21. 	ui.btnPlay->setFocusPolicy(Qt::NoFocus);
  22. 	ui.btnPause->setFocusPolicy(Qt::NoFocus);
  23. 	ui.btnStop->setFocusPolicy(Qt::NoFocus);
  24. 	ui.hSliderVolumn->setFocusPolicy(Qt::NoFocus);
  25. 	ui.cbxRate->setFocusPolicy(Qt::NoFocus);
  26.  
  27. 	connect(ui.btnOpen, &QPushButton::clicked, this, &showWidget::slotOpenFile);
  28. 	connect(ui.btnPlay, &QPushButton::clicked, this, &showWidget::slotPlay);
  29. 	connect(ui.btnPause, &QPushButton::clicked, this, &showWidget::slotPause);
  30. 	connect(ui.btnStop, &QPushButton::clicked, this, &showWidget::slotStop);
  31. 	connect(ui.hSliderVolumn, &QSlider::valueChanged, this, &showWidget::slotValueChanged);
  32. 	connect(ui.cbxRate,SIGNAL(currentIndexChanged(int)), this, SLOT(slotCurrentIndexChanged(int)));
  33. }
  34.  
  35. showWidget::~showWidget()
  36. {
  37. 	libvlc_release(vlc_base); //减少libvlc实例的引用计数，并销毁
  38. }
  39.  
  40. void showWidget::mousePressEvent(QMouseEvent *event)
  41. {
  42. 	switch (event->button())
  43. 	{
  44. 	case Qt::RightButton:
  45. 		//this->setWindowState(Qt::WindowMinimized);
  46. 		m_menu->exec(event->globalPos());
  47. 		break;
  48. 	default:
  49. 		QWidget::mousePressEvent(event);
  50. 	}
  51. }
  52.  
  53. void showWidget::mouseDoubleClickEvent(QMouseEvent *event)
  54. {
  55. 	if (this->isFullScreen())
  56. 	{
  57. 		this->showNormal();
  58. 	}
  59. 	else
  60. 	{
  61. 		this->showFullScreen();
  62. 	}
  63. }
  64.  
  65. void showWidget::keyPressEvent(QKeyEvent *event)
  66. {
  67. 	if (!vlc_mediaPlayer)
  68. 		return;
  69.  
  70. 	int value = ui.hSliderVolumn->value();
  71. 	if (event->key() == Qt::Key_W)	//添加音量
  72. 	{
  73. 		qDebug() << "up";
  74. 		slotValueChanged(value+10);
  75. 	}
  76. 	else if (event->key() == Qt::Key_S)	//减小音量
  77. 	{
  78. 		slotValueChanged(value - 10);
  79. 	}
  80. 	else if (event->key() == Qt::Key_Space)
  81. 	{
  82. 		if (vlc_mediaPlayer && libvlc_media_player_get_state(vlc_mediaPlayer) == libvlc_Playing)
  83. 		{
  84. 			libvlc_media_player_pause(vlc_mediaPlayer);
  85. 		}
  86. 		else if (vlc_mediaPlayer && libvlc_media_player_get_state(vlc_mediaPlayer) == libvlc_Paused)
  87. 		{
  88. 			libvlc_media_player_play(vlc_mediaPlayer);
  89. 		}
  90. 	}
  91. }
  92.  
  93. void showWidget::slotOpenFile()
  94. {
  95. 	/*选择文件*/
  96. 	QString filename = QFileDialog::getOpenFileName(this, "选择打开的文件", "D:/", tr("*.*"));
  97. 	std::replace(filename.begin(), filename.end(), QChar('/'), QChar('\\'));
  98. 	vlc_base = libvlc_new(0, NULL);
  99. 	vlc_media = libvlc_media_new_path(vlc_base, filename.toUtf8().data());
  100. 	if (!vlc_media) {
  101. 		return;
  102. 	}
  103.  
  104. 	// 创建libvlc实例和媒体播放器
  105. 	vlc_mediaPlayer = libvlc_media_player_new_from_media(vlc_media);
  106. 	if (!vlc_mediaPlayer) {
  107. 		return;
  108. 	}
  109. 	
  110. 	// 等待元数据加载完成
  111. 	libvlc_media_parse(vlc_media);
  112.  
  113. 	m_defalutRate = libvlc_video_get_aspect_ratio(vlc_mediaPlayer);
  114. 	m_defalutCrop = libvlc_video_get_crop_geometry(vlc_mediaPlayer);
  115.  
  116. 	libvlc_video_set_mouse_input(vlc_mediaPlayer, 0);
  117. 	libvlc_video_set_key_input(vlc_mediaPlayer, 0);
  118.  
  119. 	// 获取各种元数据
  120. 	const char *title = libvlc_media_get_meta(vlc_media, libvlc_meta_Title);
  121. 	const char *artist = libvlc_media_get_meta(vlc_media, libvlc_meta_Artist);
  122. 	const char *album = libvlc_media_get_meta(vlc_media, libvlc_meta_Album);
  123. 	const char *url = libvlc_media_get_meta(vlc_media, libvlc_meta_URL);
  124. 	const char *date = libvlc_media_get_meta(vlc_media, libvlc_meta_Date);
  125. 	const char *lang = libvlc_media_get_meta(vlc_media, libvlc_meta_Language);
  126. 	int duration = libvlc_media_get_duration(vlc_media);  // 获取时长（单位：毫秒）
  127.  
  128. 	qDebug("Title: %s", title ? title : "N/A");
  129. 	qDebug("Artist: %s", artist ? artist : "N/A");
  130. 	qDebug("Album: %s", album ? album : "N/A");
  131. 	qDebug("Duration: %d ms", duration);
  132. 	qDebug("url: %s", url ? url : "N/A");
  133. 	qDebug("date: %s", date ? date : "N/A");
  134. 	qDebug("lang: %s", lang ? lang : "N/A");
  135. 	
  136. 	libvlc_media_track_t **tracks;
  137. 	int track_count = libvlc_media_tracks_get(vlc_media,&tracks);
  138. 	for (unsigned i = 0; i < track_count; i++) 
  139. 	{
  140. 		libvlc_media_track_t* track = tracks[i];
  141.  
  142. 		// 显示轨道信息
  143. 		printf("Track #%u: %s\n", i, track->psz_description);
  144.  
  145. 		// 这里可以获取到每一个轨道的信息，比如轨道类型 track->i_type
  146. 		// 可能是 libvlc_track_video, libvlc_track_audio 或者 libvlc_track_text (字幕)
  147.  
  148. 		if (track->i_type == libvlc_track_video) {
  149. 			// 处理视频轨道信息
  150. 			qDebug("width = %d",track->video->i_width);
  151. 			qDebug("height = %d", track->video->i_height);
  152. 			qDebug("rate_num = %d", track->video->i_frame_rate_num);
  153. 			qDebug("rate_den = %d", track->video->i_frame_rate_den);
  154. 		}
  155. 		else if (track->i_type == libvlc_track_audio) {
  156. 			// 处理音频轨道信息
  157. 			qDebug("channels = %d", track->audio->i_channels);
  158. 			qDebug("rate = %d", track->audio->i_rate);
  159. 		}
  160. 		else if (track->i_type == libvlc_track_text) {
  161. 			// 处理字幕轨道信息
  162. 		}
  163. 	}
  164.  
  165. 	//获取事件管理器
  166. 	libvlc_event_manager_t *em = libvlc_media_player_event_manager(vlc_mediaPlayer);
  167.  
  168. 	// 注册事件监听器
  169. 	libvlc_event_attach(em, libvlc_MediaPlayerTimeChanged, vlcEvents, this);
  170. 	libvlc_event_attach(em, libvlc_MediaPlayerEndReached, vlcEvents, this);
  171. 	libvlc_event_attach(em, libvlc_MediaPlayerStopped, vlcEvents, this);
  172. 	libvlc_event_attach(em, libvlc_MediaPlayerPlaying, vlcEvents, this);
  173. 	libvlc_event_attach(em, libvlc_MediaPlayerPaused, vlcEvents, this);
  174.  
  175. 	libvlc_media_player_set_hwnd(vlc_mediaPlayer, (void *)ui.widgetShow->winId());
  176.  
  177. 	QTimer::singleShot(1000, this, &showWidget::slotPlay);
  178.  
  179. }
  180.  
  181. void showWidget::slotPlay()
  182. {
  183. 	if (vlc_mediaPlayer)
  184. 	{
  185. 		libvlc_media_player_play(vlc_mediaPlayer);
  186. 		m_defalutScale = libvlc_video_get_scale(vlc_mediaPlayer);
  187. 	}
  188. 	
  189. }
  190.  
  191. void showWidget::slotPause()
  192. {
  193. 	if (vlc_mediaPlayer)
  194. 		libvlc_media_player_pause(vlc_mediaPlayer);
  195. }
  196.  
  197. void showWidget::slotStop()
  198. {
  199. 	if (vlc_mediaPlayer)
  200. 		libvlc_media_player_stop(vlc_mediaPlayer);
  201. }
  202.  
  203. void showWidget::slotValueChanged(int value)
  204. {
  205. 	if (vlc_mediaPlayer)
  206. 		libvlc_audio_set_volume(vlc_mediaPlayer, value);
  207. }
  208.  
  209. void showWidget::slotCurrentIndexChanged(int index)
  210. {
  211. 	if (vlc_mediaPlayer)
  212. 		libvlc_media_player_set_rate(vlc_mediaPlayer, m_lstRate[index]);
  213. }
  214.  
  215. void showWidget::slotActionTriggered(QAction *action)
  216. {
  217. 	if (!vlc_mediaPlayer)
  218. 		return;
  219.  
  220. 	if (action == m_default)
  221. 		libvlc_video_set_aspect_ratio(vlc_mediaPlayer,m_defalutRate);
  222. 	else if(action == m_16_9)
  223. 		libvlc_video_set_aspect_ratio(vlc_mediaPlayer, "16:9");
  224. 	else if (action == m_4_3)
  225. 		libvlc_video_set_aspect_ratio(vlc_mediaPlayer, "4:3");
  226. 	else if (action == m_1_1)
  227. 		libvlc_video_set_aspect_ratio(vlc_mediaPlayer, "1:1");
  228. 	else if (action == m_16_10)
  229. 		libvlc_video_set_aspect_ratio(vlc_mediaPlayer, "16:10");
  230. 	else if (action == m_2_21_1)
  231. 		libvlc_video_set_aspect_ratio(vlc_mediaPlayer, "221:100");
  232. 	else if (action == m_2_35_1)
  233. 		libvlc_video_set_aspect_ratio(vlc_mediaPlayer, "235:100");
  234. 	else if (action == m_2_38_1)
  235. 		libvlc_video_set_aspect_ratio(vlc_mediaPlayer, "238:100");
  236. 	else if (action == m_5_4)
  237. 		libvlc_video_set_aspect_ratio(vlc_mediaPlayer, "5:4");
  238.  
  239. 	action->setIcon(QIcon(":/image/images/point.png"));
  240. 	m_preAspectRatio->setIcon(QIcon());
  241. 	m_preAspectRatio = action;
  242. }
  243.  
  244. void showWidget::slotCropActionTriggered(QAction *action)
  245. {
  246. 	if (!vlc_mediaPlayer)
  247. 		return;
  248.  
  249. 	if (action == m__cropDefault)
  250. 		libvlc_video_set_crop_geometry(vlc_mediaPlayer, m_defalutCrop);
  251. 	else if (action == m__crop16_10)
  252. 		libvlc_video_set_crop_geometry(vlc_mediaPlayer, "16:10");
  253. 	else if (action == m__crop16_9)
  254. 		libvlc_video_set_crop_geometry(vlc_mediaPlayer, "16:9");
  255. 	else if (action == m__crop4_3)
  256. 		libvlc_video_set_crop_geometry(vlc_mediaPlayer, "4:3");
  257. 	else if (action == m__crop1_85_1)
  258. 		libvlc_video_set_crop_geometry(vlc_mediaPlayer, "185:100");
  259. 	else if (action == m__crop2_21_1)
  260. 		libvlc_video_set_crop_geometry(vlc_mediaPlayer, "221:100");
  261. 	else if (action == m__crop2_35_1)
  262. 		libvlc_video_set_crop_geometry(vlc_mediaPlayer, "235:100");
  263. 	else if (action == m__crop2_39_1)
  264. 		libvlc_video_set_crop_geometry(vlc_mediaPlayer, "239:100");
  265. 	else if (action == m__crop5_3)
  266. 		libvlc_video_set_crop_geometry(vlc_mediaPlayer, "5:3");
  267. 	else if (action == m__crop5_4)
  268. 		libvlc_video_set_crop_geometry(vlc_mediaPlayer, "5:4");
  269. 	else if (action == m__crop1_1)
  270. 		libvlc_video_set_crop_geometry(vlc_mediaPlayer, "1:1");
  271.  
  272. 	action->setIcon(QIcon(":/image/images/point.png"));
  273. 	m_preCrop->setIcon(QIcon());
  274. 	m_preCrop = action;
  275. }
  276.  
  277. void showWidget::slotScaleActionTriggered(QAction *action)
  278. {
  279. 	if (!vlc_mediaPlayer)
  280. 		return;
  281.  
  282. 	if (action == m_scale1_4)
  283. 		libvlc_video_set_scale(vlc_mediaPlayer, 0.25);
  284. 	else if (action == m_scale1_2)
  285. 		libvlc_video_set_scale(vlc_mediaPlayer, 0.5);
  286. 	else if (action == m_scale1_1)
  287. 		libvlc_video_set_scale(vlc_mediaPlayer, 1);
  288. 	else if (action == m_scale2_1)
  289. 		libvlc_video_set_scale(vlc_mediaPlayer, 2);
  290.  
  291. 	action->setIcon(QIcon(":/image/images/point.png"));
  292. 	m_preScale->setIcon(QIcon());
  293. 	m_preScale = action;
  294. }
  295.  
  296. //事件回调
  297. void showWidget::vlcEvents(const libvlc_event_t *ev, void *param)
  298. {
  299. 	showWidget *w = (showWidget*)param;
  300. 	//处理不同的事件
  301. 	switch (ev->type) {
  302. 	case libvlc_MediaPlayerTimeChanged:
  303. 	{
  304. 		//qDebug() << "VLC媒体播放器时间已更改";
  305. 		qint64 len = libvlc_media_player_get_time(w->vlc_mediaPlayer);
  306. 		libvlc_time_t lenSec = len / 1000;
  307.  
  308. 		libvlc_time_t totalLen = libvlc_media_player_get_length(w->vlc_mediaPlayer);
  309. 		libvlc_time_t totalLenSec = totalLen / 1000;
  310.  
  311. 		int thh, tmm, tss;
  312. 		thh = lenSec / 3600;
  313. 		tmm = (lenSec % 3600) / 60;
  314. 		tss = (lenSec % 60);
  315. 		QTime time(thh, tmm, tss);
  316. 		w->ui.lbCurTime->setText(time.toString("hh:mm:ss"));
  317.  
  318. 		thh = totalLenSec / 3600;
  319. 		tmm = (totalLenSec % 3600) / 60;
  320. 		tss = (totalLenSec % 60);
  321. 		QTime TotalTime(thh, tmm, tss);
  322. 		w->ui.lbTotalTime->setText(TotalTime.toString("hh:mm:ss"));
  323.  
  324. 		double pos = (double)lenSec / totalLenSec * 100;
  325. 		w->ui.horizontalSlider->setValue(pos);
  326. 	}
  327. 		break;
  328. 	case libvlc_MediaPlayerEndReached:
  329. 		qDebug() << "VLC播放完毕.";
  330. 		break;
  331. 	case libvlc_MediaPlayerStopped:
  332. 		qDebug() << "VLC停止播放";
  333. 		break;
  334. 	case libvlc_MediaPlayerPlaying:
  335. 		qDebug() << "VLC开始播放";
  336. 		break;
  337. 	case libvlc_MediaPlayerPaused:
  338. 		qDebug() << "VLC暂停播放";
  339. 		break;
  340. 	}
  341. }
  342.  
  343. void showWidget::initMenu()
  344. {
  345. 	//总菜单
  346. 	m_menu = new QMenu(this);
  347. 	m_video = m_menu->addAction("视频");
  348.  
  349. 	//视频菜单
  350. 	m_videoMenu = new QMenu(this);
  351. 	m_scaleAction = m_videoMenu->addAction("缩放");
  352. 	m_aspectRatioAction = m_videoMenu->addAction("宽高比");
  353. 	m_cropAction = m_videoMenu->addAction("裁剪");
  354.  
  355. 	m_video->setMenu(m_videoMenu);
  356.  
  357. 	//宽高比菜单
  358. 	m_aspectRatioMenu = new QMenu(this);
  359. 	m_aspectRatioAction->setMenu(m_aspectRatioMenu);
  360.  
  361. 	//设置宽高比菜单
  362. 	m_default = m_aspectRatioMenu->addAction(QIcon(":/image/images/point.png"), "默认");
  363. 	m_16_9 = m_aspectRatioMenu->addAction("16:9");
  364. 	m_4_3 = m_aspectRatioMenu->addAction("4:3");
  365. 	m_1_1 = m_aspectRatioMenu->addAction("1:1");
  366. 	m_16_10 = m_aspectRatioMenu->addAction("16:10");
  367. 	m_2_21_1 = m_aspectRatioMenu->addAction("2.21:1");
  368. 	m_2_35_1 = m_aspectRatioMenu->addAction("2.35:1");
  369. 	m_2_38_1 = m_aspectRatioMenu->addAction("2.38:1");
  370. 	m_5_4 = m_aspectRatioMenu->addAction("5:4");
  371.  
  372. 	m_preAspectRatio = m_default;
  373.  
  374. 	m_group = new QActionGroup(this);
  375. 	m_group->addAction(m_default);
  376. 	m_group->addAction(m_16_9);
  377. 	m_group->addAction(m_4_3);
  378. 	m_group->addAction(m_1_1);
  379. 	m_group->addAction(m_16_10);
  380. 	m_group->addAction(m_2_21_1);
  381. 	m_group->addAction(m_2_35_1);
  382. 	m_group->addAction(m_2_38_1);
  383. 	m_group->addAction(m_5_4);
  384.  
  385. 	connect(m_group, &QActionGroup::triggered, this, &showWidget::slotActionTriggered);
  386.  
  387. 	//设置裁剪菜单
  388. 	m_cropMenu = new QMenu(this);
  389. 	m_cropAction->setMenu(m_cropMenu);
  390.  
  391. 	m__cropDefault = m_cropMenu->addAction(QIcon(":/image/images/point.png"), "默认");
  392. 	m__crop16_10 = m_cropMenu->addAction("16:10");
  393. 	m__crop16_9 = m_cropMenu->addAction("16:9");
  394. 	m__crop4_3 = m_cropMenu->addAction("4:3");
  395. 	m__crop1_85_1 = m_cropMenu->addAction("1.85:1");
  396. 	m__crop2_21_1 = m_cropMenu->addAction("2.21:1");
  397. 	m__crop2_35_1 = m_cropMenu->addAction("2.35:1");
  398. 	m__crop2_39_1 = m_cropMenu->addAction("2.39:1");
  399. 	m__crop5_3 = m_cropMenu->addAction("5:3");
  400. 	m__crop5_4 = m_cropMenu->addAction("5:4");
  401. 	m__crop1_1 = m_cropMenu->addAction("1:1");
  402.  
  403. 	m_preCrop = m__cropDefault;
  404.  
  405. 	m_cropGroup = new QActionGroup(this);
  406. 	m_cropGroup->addAction(m__cropDefault);
  407. 	m_cropGroup->addAction(m__crop16_10);
  408. 	m_cropGroup->addAction(m__crop16_9);
  409. 	m_cropGroup->addAction(m__crop4_3);
  410. 	m_cropGroup->addAction(m__crop1_85_1);
  411. 	m_cropGroup->addAction(m__crop2_21_1);
  412. 	m_cropGroup->addAction(m__crop2_35_1);
  413. 	m_cropGroup->addAction(m__crop2_39_1);
  414. 	m_cropGroup->addAction(m__crop5_3);
  415. 	m_cropGroup->addAction(m__crop5_4);
  416. 	m_cropGroup->addAction(m__crop1_1);
  417.  
  418. 	connect(m_cropGroup, &QActionGroup::triggered, this, &showWidget::slotCropActionTriggered);
  419.  
  420.  
  421. 	//设置缩放菜单
  422. 	m_scaleMenu = new QMenu(this);
  423. 	m_scaleAction->setMenu(m_scaleMenu);
  424.  
  425. 	m_scale1_4 = m_scaleMenu->addAction("1:4 四分之一");
  426. 	m_scale1_2 = m_scaleMenu->addAction("1:2 二分之一");
  427. 	m_scale1_1 = m_scaleMenu->addAction(QIcon(":/image/images/point.png"),"1:1 原始");
  428. 	m_scale2_1 = m_scaleMenu->addAction("2:1 双倍");
  429.  
  430. 	m_scaleGroup = new QActionGroup(this);
  431. 	m_scaleGroup->addAction(m_scale1_4);
  432. 	m_scaleGroup->addAction(m_scale1_2);
  433. 	m_scaleGroup->addAction(m_scale1_1);
  434. 	m_scaleGroup->addAction(m_scale2_1);
  435.  
  436. 	m_preScale = m_scale1_1;
  437.  
  438. 	connect(m_scaleGroup, &QActionGroup::triggered, this, &showWidget::slotScaleActionTriggered);
  439. }

更多参考：

libVLC 事件机制-CSDN博客

libVLC windows开发环境搭建-CSDN博客

https://sunnnnnn666.blog.csdn.net/article/details/136854500

libVLC 元数据-CSDN博客

libVLC 添加图片和文本水印-CSDN博客

https://sunnnnnn666.blog.csdn.net/article/details/136920169

https://sunnnnnn666.blog.csdn.net/article/details/137023036

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