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libVLC 音频立体声模式切换

作者：AllinToyou | 2024-04-09 14:19:40

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libVLC 音频立体声模式切换

在libVLC中，可以使用libvlc_audio_set_channel函数来设置音频的立体声模式。这个函数允许选择不同的音频通道，例如立体声、左声道、右声道、环绕声等。

  1. /**
  2.  * Set current audio channel.
  3.  *
  4.  * \param p_mi media player
  5.  * \param channel the audio channel, \see libvlc_audio_output_channel_t
  6.  * \return 0 on success, -1 on error
  7.  */
  8. LIBVLC_API int libvlc_audio_set_channel( libvlc_media_player_t *p_mi, int channel );

参数说明：

  • p_mi：媒体播放器实例。
  • channel：要设置的音频通道，是一个 libvlc_audio_output_channel_t 类型的枚举值。

返回值是一个整数，如果设置成功则返回 0，如果设置失败则返回一个负数。

的可能值包括：

  1. /**
  2.  * Audio channels
  3.  */
  4. typedef enum libvlc_audio_output_channel_t {
  5.     libvlc_AudioChannel_Error   = -1, //错误通道
  6.     libvlc_AudioChannel_Stereo  =  1, //立体声
  7.     libvlc_AudioChannel_RStereo =  2, //翻转立体声
  8.     libvlc_AudioChannel_Left    =  3, //左声道
  9.     libvlc_AudioChannel_Right   =  4, //右声道
  10.     libvlc_AudioChannel_Dolbys  =  5  //杜比环绕声
  11. } libvlc_audio_output_channel_t;

以下是VLC播放器中使用的视频裁剪，我们仿照这个做一个界面。  

以下是做出来的效果：

首先做一个菜单：

  1. 	QMenu *m_moduleMenu = nullptr;		//立体声模式菜单
  2.     QAction *m_actionModule = nullptr;	//立体声模式
  3.  
  4. 	QAction *m_actionMono = nullptr;//单声道
  5. 	QAction *m_actionStereo = nullptr;//立体声
  6. 	QAction *m_actionLeft = nullptr;//左声道
  7. 	QAction *m_actionRight = nullptr;//右声道
  8. 	QAction *m_actionRevStereo = nullptr;//反转立体声
  9.  
  10.     
  11.     m_moduleMenu = new QMenu(this);
  12. 	m_actionMono = m_moduleMenu->addAction("单声道");
  13. 	m_actionMono->setData((int)libvlc_AudioChannel_Dolbys);
  14. 	m_actionStereo = m_moduleMenu->addAction("立体声");
  15. 	m_actionStereo->setData((int)libvlc_AudioChannel_Stereo);
  16. 	m_actionLeft = m_moduleMenu->addAction("左声道");
  17. 	m_actionLeft->setData((int)libvlc_AudioChannel_Left);
  18. 	m_actionRight = m_moduleMenu->addAction("右声道");
  19. 	m_actionRight->setData((int)libvlc_AudioChannel_Right);
  20. 	m_actionRevStereo = m_moduleMenu->addAction("反转立体声");
  21. 	m_actionRevStereo->setData((int)libvlc_AudioChannel_RStereo);
  22. 	m_actionModule->setMenu(m_moduleMenu);

接受槽函数的响应事件：

  1. void showWidget::slotActionModuleTriggered(QAction *action)
  2. {
  3. 	if (!vlc_mediaPlayer)
  4. 		return;
  5.  
  6. 	libvlc_audio_output_channel_t channel = (libvlc_audio_output_channel_t)action->data().toInt();
  7. 	int cc = libvlc_audio_set_channel(vlc_mediaPlayer, channel);
  8.  
  9. 	action->setIcon(QIcon(":/image/images/point.png"));
  10. 	m_preAction->setIcon(QIcon());
  11. 	m_preAction = action;
  12. }

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. private slots:
  33. 	void slotOpenFile();
  34. 	void slotPlay();
  35. 	void slotPause();
  36. 	void slotStop();
  37. 	void slotValueChanged(int value);
  38. 	void slotCurrentIndexChanged(int index);
  39. 	void slotActionTriggered(QAction *action);
  40. 	void slotActionModuleTriggered(QAction *action);
  41.  
  42. protected:
  43. 	virtual void mousePressEvent(QMouseEvent *event);
  44.  
  45. private:
  46. 	//事件处理回调
  47. 	static void vlcEvents(const libvlc_event_t *ev, void *param);
  48.  
  49. private:
  50.     Ui::showWidgetClass ui;
  51.  
  52. private:
  53. 	libvlc_instance_t *vlc_base = nullptr;
  54. 	libvlc_media_t *vlc_media = nullptr;
  55. 	libvlc_media_player_t *vlc_mediaPlayer = nullptr;
  56.  
  57. 	QList<float> m_lstRate;
  58.     QList<QString> m_lstAudioDevice;
  59.  
  60. 	QMenu *m_menu = nullptr;
  61.  
  62. 	QMenu *m_deviceMenu = nullptr;			//音频设备菜单
  63. 	QMenu *m_moduleMenu = nullptr;		//立体声模式菜单
  64.  
  65. 	QAction *m_actionAudioDev = nullptr;	//音频设备
  66. 	QAction *m_actionModule = nullptr;	//立体声模式
  67.  
  68. 	QAction *m_actionMono = nullptr;//单声道
  69. 	QAction *m_actionStereo = nullptr;//立体声
  70. 	QAction *m_actionLeft = nullptr;//左声道
  71. 	QAction *m_actionRight = nullptr;//右声道
  72. 	QAction *m_actionRevStereo = nullptr;//反转立体声
  73.  
  74. 	QActionGroup *m_group = nullptr;
  75. 	QActionGroup *m_groupModule = nullptr;
  76.  
  77. 	QAction *m_preAction = nullptr;
  78. };

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. 	m_menu = new QMenu(this);
  15.  
  16. 	m_actionAudioDev = m_menu->addAction("音频设备");
  17. 	m_actionModule = m_menu->addAction("立体声模式");
  18.  
  19. 	m_deviceMenu = new QMenu(this);
  20. 	m_actionAudioDev->setMenu(m_deviceMenu);
  21.  
  22. 	m_moduleMenu = new QMenu(this);
  23. 	m_actionMono = m_moduleMenu->addAction("单声道");
  24. 	m_actionMono->setData((int)libvlc_AudioChannel_Dolbys);
  25. 	m_actionStereo = m_moduleMenu->addAction("立体声");
  26. 	m_actionStereo->setData((int)libvlc_AudioChannel_Stereo);
  27. 	m_actionLeft = m_moduleMenu->addAction("左声道");
  28. 	m_actionLeft->setData((int)libvlc_AudioChannel_Left);
  29. 	m_actionRight = m_moduleMenu->addAction("右声道");
  30. 	m_actionRight->setData((int)libvlc_AudioChannel_Right);
  31. 	m_actionRevStereo = m_moduleMenu->addAction("反转立体声");
  32. 	m_actionRevStereo->setData((int)libvlc_AudioChannel_RStereo);
  33. 	m_actionModule->setMenu(m_moduleMenu);
  34.  
  35. 	m_group = new QActionGroup(this);
  36. 	connect(m_group, &QActionGroup::triggered, this, &showWidget::slotActionTriggered);
  37.  
  38. 	m_groupModule = new QActionGroup(this);
  39. 	m_groupModule->addAction(m_actionMono);
  40. 	m_groupModule->addAction(m_actionStereo);
  41. 	m_groupModule->addAction(m_actionLeft);
  42. 	m_groupModule->addAction(m_actionRight);
  43. 	m_groupModule->addAction(m_actionRevStereo);
  44. 	connect(m_groupModule, &QActionGroup::triggered, this, &showWidget::slotActionModuleTriggered);
  45.  
  46. 	vlc_base = libvlc_new(0, NULL);
  47.  
  48. 	m_lstAudioDevice.clear();
  49. 	libvlc_audio_output_device_t *pDevList = nullptr;
  50. 	libvlc_audio_output_t *pOutputList = libvlc_audio_output_list_get(vlc_base);
  51. 	while (pOutputList)
  52. 	{
  53. 		//获取设备
  54. 		pDevList = libvlc_audio_output_device_list_get(vlc_base, pOutputList->psz_name);
  55.  
  56. 		while (pDevList)
  57. 		{
  58. 			// 找到我想要的那个设备，跳出循环，这里使用i控制，我知道我想要的设备位置
  59. 			if (strcmp(pOutputList->psz_name, "mmdevice") == 0)
  60. 			{
  61. 				QString des = QString::fromStdString(std::string(pDevList->psz_description, strlen(pDevList->psz_description)));
  62. 				m_lstAudioDevice.append(des);
  63.  
  64. 				QAction *action = m_deviceMenu->addAction(des);
  65. 				action->setData(pDevList->psz_device);
  66. 				m_group->addAction(action);
  67. 			}
  68.  
  69. 			pDevList = pDevList->p_next;
  70. 		}
  71. 		pOutputList = pOutputList->p_next;
  72. 	}
  73.  
  74. 	ui.cbxRate->setCurrentIndex(Rate1_0X);
  75.  
  76. 	m_lstRate << 2.0 << 1.5 << 1.25 << 1.0 << 0.75 << 0.5;
  77.  
  78. 	ui.btnOpen->setFocusPolicy(Qt::NoFocus);
  79. 	ui.btnPlay->setFocusPolicy(Qt::NoFocus);
  80. 	ui.btnPause->setFocusPolicy(Qt::NoFocus);
  81. 	ui.btnStop->setFocusPolicy(Qt::NoFocus);
  82. 	ui.hSliderVolumn->setFocusPolicy(Qt::NoFocus);
  83. 	ui.cbxRate->setFocusPolicy(Qt::NoFocus);
  84.  
  85. 	connect(ui.btnOpen, &QPushButton::clicked, this, &showWidget::slotOpenFile);
  86. 	connect(ui.btnPlay, &QPushButton::clicked, this, &showWidget::slotPlay);
  87. 	connect(ui.btnPause, &QPushButton::clicked, this, &showWidget::slotPause);
  88. 	connect(ui.btnStop, &QPushButton::clicked, this, &showWidget::slotStop);
  89. 	connect(ui.hSliderVolumn, &QSlider::valueChanged, this, &showWidget::slotValueChanged);
  90. 	connect(ui.cbxRate,SIGNAL(currentIndexChanged(int)), this, SLOT(slotCurrentIndexChanged(int)));
  91. }
  92.  
  93. showWidget::~showWidget()
  94. {
  95. 	libvlc_release(vlc_base); //减少libvlc实例的引用计数，并销毁
  96. }
  97.  
  98.  
  99. void showWidget::slotOpenFile()
  100. {
  101. 	/*选择文件*/
  102. 	QString filename = QFileDialog::getOpenFileName(this, "选择打开的文件", "D:/", tr("*.*"));
  103. 	std::replace(filename.begin(), filename.end(), QChar('/'), QChar('\\'));
  104.  
  105. 	
  106. 	vlc_media = libvlc_media_new_path(vlc_base, filename.toUtf8().data());
  107. 	if (!vlc_media) {
  108. 		return;
  109. 	}
  110.  
  111. 	// 创建libvlc实例和媒体播放器
  112. 	vlc_mediaPlayer = libvlc_media_player_new_from_media(vlc_media);
  113. 	if (!vlc_mediaPlayer) {
  114. 		return;
  115. 	}
  116.  
  117. 	//libvlc_media_add_option(vlc_media, "--video-filter=transform");
  118. 	//libvlc_media_add_option(vlc_media, "---transform-type=270");
  119. 	
  120. 	// 等待元数据加载完成
  121. 	libvlc_media_parse(vlc_media);
  122.  
  123. 	libvlc_video_set_mouse_input(vlc_mediaPlayer, 0);
  124. 	libvlc_video_set_key_input(vlc_mediaPlayer, 0);
  125.  
  126. 	// 获取各种元数据
  127. 	const char *title = libvlc_media_get_meta(vlc_media, libvlc_meta_Title);
  128. 	const char *artist = libvlc_media_get_meta(vlc_media, libvlc_meta_Artist);
  129. 	const char *album = libvlc_media_get_meta(vlc_media, libvlc_meta_Album);
  130. 	const char *url = libvlc_media_get_meta(vlc_media, libvlc_meta_URL);
  131. 	const char *date = libvlc_media_get_meta(vlc_media, libvlc_meta_Date);
  132. 	const char *lang = libvlc_media_get_meta(vlc_media, libvlc_meta_Language);
  133. 	int duration = libvlc_media_get_duration(vlc_media);  // 获取时长（单位：毫秒）
  134.  
  135. 	qDebug("Title: %s", title ? title : "N/A");
  136. 	qDebug("Artist: %s", artist ? artist : "N/A");
  137. 	qDebug("Album: %s", album ? album : "N/A");
  138. 	qDebug("Duration: %d ms", duration);
  139. 	qDebug("url: %s", url ? url : "N/A");
  140. 	qDebug("date: %s", date ? date : "N/A");
  141. 	qDebug("lang: %s", lang ? lang : "N/A");
  142. 	
  143. 	libvlc_media_track_t **tracks;
  144. 	int track_count = libvlc_media_tracks_get(vlc_media,&tracks);
  145. 	for (unsigned i = 0; i < track_count; i++) 
  146. 	{
  147. 		libvlc_media_track_t* track = tracks[i];
  148.  
  149. 		// 显示轨道信息
  150. 		printf("Track #%u: %s\n", i, track->psz_description);
  151.  
  152. 		// 这里可以获取到每一个轨道的信息，比如轨道类型 track->i_type
  153. 		// 可能是 libvlc_track_video, libvlc_track_audio 或者 libvlc_track_text (字幕)
  154.  
  155. 		if (track->i_type == libvlc_track_video) {
  156. 			// 处理视频轨道信息
  157. 			qDebug("width = %d",track->video->i_width);
  158. 			qDebug("height = %d", track->video->i_height);
  159. 			qDebug("rate_num = %d", track->video->i_frame_rate_num);
  160. 			qDebug("rate_den = %d", track->video->i_frame_rate_den);
  161. 		}
  162. 		else if (track->i_type == libvlc_track_audio) {
  163. 			// 处理音频轨道信息
  164. 			qDebug("channels = %d", track->audio->i_channels);
  165. 			qDebug("rate = %d", track->audio->i_rate);
  166. 		}
  167. 		else if (track->i_type == libvlc_track_text) {
  168. 			// 处理字幕轨道信息
  169. 		}
  170. 	}
  171.  
  172. 	//获取事件管理器
  173. 	libvlc_event_manager_t *em = libvlc_media_player_event_manager(vlc_mediaPlayer);
  174.  
  175. 	// 注册事件监听器
  176. 	libvlc_event_attach(em, libvlc_MediaPlayerTimeChanged, vlcEvents, this);
  177. 	libvlc_event_attach(em, libvlc_MediaPlayerEndReached, vlcEvents, this);
  178. 	libvlc_event_attach(em, libvlc_MediaPlayerStopped, vlcEvents, this);
  179. 	libvlc_event_attach(em, libvlc_MediaPlayerPlaying, vlcEvents, this);
  180. 	libvlc_event_attach(em, libvlc_MediaPlayerPaused, vlcEvents, this);
  181.  
  182. 	libvlc_media_player_set_hwnd(vlc_mediaPlayer, (void *)ui.widgetShow->winId());
  183.  
  184. 	libvlc_video_set_adjust_int(vlc_mediaPlayer, libvlc_adjust_Enable, 1);
  185.  
  186. 	//获取当前的channel
  187. 	int curChannel = libvlc_audio_get_channel(vlc_mediaPlayer);
  188. 	m_actionStereo->setIcon(QIcon(":/image/images/point.png"));
  189. 	m_preAction = m_actionStereo;
  190.  
  191. 	QTimer::singleShot(1000, this, &showWidget::slotPlay);
  192. 	libvlc_video_filter_list_get(vlc_base);
  193. }
  194.  
  195. void showWidget::slotPlay()
  196. {
  197. 	if (vlc_mediaPlayer)
  198. 	{
  199. 		libvlc_media_player_play(vlc_mediaPlayer);
  200. 	}
  201. 	
  202. }
  203.  
  204. void showWidget::slotPause()
  205. {
  206. 	if (vlc_mediaPlayer)
  207. 		libvlc_media_player_pause(vlc_mediaPlayer);
  208. }
  209.  
  210. void showWidget::slotStop()
  211. {
  212. 	if (vlc_mediaPlayer)
  213. 		libvlc_media_player_stop(vlc_mediaPlayer);
  214. }
  215.  
  216. void showWidget::slotValueChanged(int value)
  217. {
  218. 	if (vlc_mediaPlayer)
  219. 		libvlc_audio_set_volume(vlc_mediaPlayer, value);
  220. }
  221.  
  222. void showWidget::slotCurrentIndexChanged(int index)
  223. {
  224. 	if (vlc_mediaPlayer)
  225. 		libvlc_media_player_set_rate(vlc_mediaPlayer, m_lstRate[index]);
  226. }
  227.  
  228. void showWidget::slotActionTriggered(QAction *action)
  229. {
  230. 	if (!vlc_mediaPlayer)
  231. 		return;
  232. 	
  233. 	QString txt = action->data().toString();
  234.  
  235. 	//指定设备输出pDevList->psz_device
  236. 	libvlc_audio_output_device_set(vlc_mediaPlayer, NULL, txt.toStdString().c_str());
  237. }
  238.  
  239. void showWidget::slotActionModuleTriggered(QAction *action)
  240. {
  241. 	if (!vlc_mediaPlayer)
  242. 		return;
  243.  
  244. 	libvlc_audio_output_channel_t channel = (libvlc_audio_output_channel_t)action->data().toInt();
  245. 	int cc = libvlc_audio_set_channel(vlc_mediaPlayer, channel);
  246.  
  247. 	action->setIcon(QIcon(":/image/images/point.png"));
  248. 	m_preAction->setIcon(QIcon());
  249. 	m_preAction = action;
  250. }
  251.  
  252. void showWidget::mousePressEvent(QMouseEvent *event)
  253. {
  254. 	switch (event->button())
  255. 	{
  256. 	case Qt::RightButton:
  257. 		//this->setWindowState(Qt::WindowMinimized);
  258. 		m_menu->exec(event->globalPos());
  259. 		break;
  260. 	default:
  261. 		QWidget::mousePressEvent(event);
  262. 	}
  263. }
  264.  
  265.  
  266. //事件回调
  267. void showWidget::vlcEvents(const libvlc_event_t *ev, void *param)
  268. {
  269. 	showWidget *w = (showWidget*)param;
  270. 	//处理不同的事件
  271. 	switch (ev->type) {
  272. 	case libvlc_MediaPlayerTimeChanged:
  273. 	{
  274. 		//qDebug() << "VLC媒体播放器时间已更改";
  275. 		qint64 len = libvlc_media_player_get_time(w->vlc_mediaPlayer);
  276. 		libvlc_time_t lenSec = len / 1000;
  277.  
  278. 		libvlc_time_t totalLen = libvlc_media_player_get_length(w->vlc_mediaPlayer);
  279. 		libvlc_time_t totalLenSec = totalLen / 1000;
  280.  
  281. 		int thh, tmm, tss;
  282. 		thh = lenSec / 3600;
  283. 		tmm = (lenSec % 3600) / 60;
  284. 		tss = (lenSec % 60);
  285. 		QTime time(thh, tmm, tss);
  286. 		w->ui.lbCurTime->setText(time.toString("hh:mm:ss"));
  287.  
  288. 		thh = totalLenSec / 3600;
  289. 		tmm = (totalLenSec % 3600) / 60;
  290. 		tss = (totalLenSec % 60);
  291. 		QTime TotalTime(thh, tmm, tss);
  292. 		w->ui.lbTotalTime->setText(TotalTime.toString("hh:mm:ss"));
  293.  
  294. 		double pos = (double)lenSec / totalLenSec * 100;
  295. 		w->ui.horizontalSlider->setValue(pos);
  296. 	}
  297. 		break;
  298. 	case libvlc_MediaPlayerEndReached:
  299. 		qDebug() << "VLC播放完毕.";
  300. 		break;
  301. 	case libvlc_MediaPlayerStopped:
  302. 		qDebug() << "VLC停止播放";
  303. 		break;
  304. 	case libvlc_MediaPlayerPlaying:
  305. 		qDebug() << "VLC开始播放";
  306. 		break;
  307. 	case libvlc_MediaPlayerPaused:
  308. 		qDebug() << "VLC暂停播放";
  309. 		break;
  310. 	}
  311. }

更多参考：

libVLC 事件机制-CSDN博客

libVLC windows开发环境搭建-CSDN博客

libVLC 元数据-CSDN博客

libVLC 添加图片和文本水印-CSDN博客

libVLC 音频输出设备切换-CSDN博客

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