1.在(Linux)ubuntu下通过GTK调用libvlc开发视频播放器
2.c++使用libvlc实现简单的播放器
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在(Linux)ubuntu下通过GTK调用libvlc开发视频播放器
本文详细介绍了在Ubuntu下通过GTK图形用户界面库(GTK)与libvlc媒体播放器库合作开发视频播放器的过程。GTK是一个开源跨平台图形工具包,而libvlc则是VLC媒体播放器的核心库,可方便嵌入到其他应用中。
VLC,作为一款功能强大的日程源码多媒体播放器,支持众多格式,而libvlc则提供了丰富的API,让开发者能够在其应用程序中嵌入类似VLC的播放功能。为了在Ubuntu上实现视频播放器,首先需要安装libvlc和GTK相关的开发库,如libvlc-dev和libgtk-3-dev,通过apt-get或源码编译安装。北京三咖源码
开发过程中,关键步骤包括:引入libvlc和GTK的头文件和库,利用GtkBuilder动态加载预先设计的UI(如通过glade工具创建的ui.glade文件),创建GTK窗口、视频控件,初始化libvlc并创建播放器对象,展业助手源码将视频控件与播放器绑定,然后将视频控件添加到窗口并启动主循环。完整的设计代码包括main.c和ui.glade文件,可通过glade工具创建和管理UI设计。
总的来说,这个项目结合了GTK的冰龙之谷源码图形界面设计和libvlc的多媒体播放能力,为用户提供了一款功能丰富的视频播放器,适用于Ubuntu和其他支持GTK的Linux系统。
c++使用libvlc实现简单的播放器
VLC Media Player是一款功能强大的播放器,广泛支持多种解码器,但其源代码编译过程复杂,故通常使用编译好的迷缘助手源码库。
要获取VLC的SDK,请访问下载页面:download.videolan.org/p...
接下来,我们进入如何使用libvlc库创建简单播放器的核心内容。
在libvlc使用过程中,可能会遇到一些常见问题:
问题1:libvlc_new(0,NULL)函数始终失败。解决办法:将SDK目录下的plugins文件夹复制到exe目录。
问题2:libvlc_media_new_path(inst,“D:/box.mp4”);返回空。解决办法:正确的路径格式应为“D:\box.mp4”。注意路径格式对于Windows系统至关重要。
问题3:遇到“libvlc_media_read_cb”未声明标识符错误。解决办法:在vlc.h文件或相关文件中添加typedef __int ssize_t;这可以解决编译器对该标识符的未知问题。
问题4:libvlc_media_get_duration、libvlc_media_player_get_length、libvlc_media_player_get_time函数返回-1。原因在于未解析元数据。解决办法:确保libvlc_media_t在解析视频或至少播放一次后才能获取元数据。可以使用libvlc_media_parse_with_options进行异步解析本地媒体,或者先播放一次以同步获取元数据。
在解析媒体数据和订阅VLC事件时,实现以下步骤:
步骤3:开始异步解析本地媒体。
在VLC中,事件回调函数用于处理特定的事件。其形式如下:
event_callback(说明:事件回调函数) 参数event(事件类型) 参数userData(自定义数据类型,可设置为NULL)
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ãã//public static final int MediaFreed = 4;
ãã//public static final int MediaStateChanged = 5;
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ãã//public static final int MediaPlayerMediaChanged = 0x;
ãã//public static final int MediaPlayerNothingSpecial = 0x;
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ããstatic const libvlc_event_type_t mp_events[] = {
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ããlibvlc_MediaPlayerPaused,
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ãã#define DEF( a ) { libvlc_##a, #a, },
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ããtypedef struct
ãã{
ããint type;
ããconst char name[];
ãã} event_name_t;
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ããstatic const event_name_t event_list[] = {
ããDEF(MediaMetaChanged)
ããDEF(MediaSubItemAdded)
ããDEF(MediaDurationChanged)
ããDEF(MediaParsedChanged)
ããDEF(MediaFreed)
ããDEF(MediaStateChanged)
ãã
ããDEF(MediaPlayerMediaChanged)
ããDEF(MediaPlayerNothingSpecial)
ããDEF(MediaPlayerOpening)
ããDEF(MediaPlayerBuffering)
ããDEF(MediaPlayerPlaying)
ããDEF(MediaPlayerPaused)
ããDEF(MediaPlayerStopped)
ããDEF(MediaPlayerForward)
ããDEF(MediaPlayerBackward)
ããDEF(MediaPlayerEndReached)
ããDEF(MediaPlayerEncounteredError)
ããDEF(MediaPlayerTimeChanged)
ããDEF(MediaPlayerPositionChanged)
ããDEF(MediaPlayerSeekableChanged)
ããDEF(MediaPlayerPausableChanged)
ããDEF(MediaPlayerTitleChanged)
ããDEF(MediaPlayerSnapshotTaken)
ããDEF(MediaPlayerLengthChanged)
ããDEF(MediaPlayerVout)
ãã
ããDEF(MediaListItemAdded)
ããDEF(MediaListWillAddItem)
ããDEF(MediaListItemDeleted)
ããDEF(MediaListWillDeleteItem)
ãã
ããDEF(MediaListViewItemAdded)
ããDEF(MediaListViewWillAddItem)
ããDEF(MediaListViewItemDeleted)
ããDEF(MediaListViewWillDeleteItem)
ãã
ããDEF(MediaListPlayerPlayed)
ããDEF(MediaListPlayerNextItemSet)
ããDEF(MediaListPlayerStopped)
ãã
ããDEF(MediaDiscovererStarted)
ããDEF(MediaDiscovererEnded)
ãã
ããDEF(VlmMediaAdded)
ããDEF(VlmMediaRemoved)
ããDEF(VlmMediaChanged)
ããDEF(VlmMediaInstanceStarted)
ããDEF(VlmMediaInstanceStopped)
ããDEF(VlmMediaInstanceStatusInit)
ããDEF(VlmMediaInstanceStatusOpening)
ããDEF(VlmMediaInstanceStatusPlaying)
ããDEF(VlmMediaInstanceStatusPause)
ããDEF(VlmMediaInstanceStatusEnd)
ããDEF(VlmMediaInstanceStatusError)
ãã};
ãã#undef DEF
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