怎么建立微网站?,wordpress超级开关,北京全包圆装修公司电话,如何做网页推广的网页libVLC是一个流行的开源多媒体播放器框架#xff0c;它提供了丰富的 API 用于开发视频播放相关的应用程序。获取轨道信息#xff0c;是指获取当前媒体文件的音频、视频或字幕等轨道信息。
常见的视频文件一般都有音频和视频、特殊的会带有字幕文件。
媒体轨道信息结构存放在…libVLC是一个流行的开源多媒体播放器框架它提供了丰富的 API 用于开发视频播放相关的应用程序。获取轨道信息是指获取当前媒体文件的音频、视频或字幕等轨道信息。
常见的视频文件一般都有音频和视频、特殊的会带有字幕文件。
媒体轨道信息结构存放在libvlc_media_track_t结构体中如下所示
typedef struct libvlc_media_track_t
{/* Codec fourcc */uint32_t i_codec;uint32_t i_original_fourcc;int i_id;libvlc_track_type_t i_type;/* Codec specific */int i_profile;int i_level;union {libvlc_audio_track_t *audio;libvlc_video_track_t *video;libvlc_subtitle_track_t *subtitle;};unsigned int i_bitrate;char *psz_language;char *psz_description;} libvlc_media_track_t;
轨道的类型如下所示
typedef enum libvlc_track_type_t
{libvlc_track_unknown -1,libvlc_track_audio 0, //音频libvlc_track_video 1, //视频libvlc_track_text 2 //字幕
} libvlc_track_type_t;
联合体分别存放音频、视频、字幕数据。 union {libvlc_audio_track_t *audio;libvlc_video_track_t *video;libvlc_subtitle_track_t *subtitle;};
音频数据如下通道数量、采样率。
typedef struct libvlc_audio_track_t
{unsigned i_channels;unsigned i_rate;
} libvlc_audio_track_t;
视频数据存放宽、高等一些数据。
typedef struct libvlc_video_track_t
{unsigned i_height;unsigned i_width;unsigned i_sar_num;unsigned i_sar_den;unsigned i_frame_rate_num;unsigned i_frame_rate_den;libvlc_video_orient_t i_orientation;libvlc_video_projection_t i_projection;libvlc_video_viewpoint_t pose; /** Initial view point */
} libvlc_video_track_t;
字幕数据字符串。
typedef struct libvlc_subtitle_track_t
{char *psz_encoding;
} libvlc_subtitle_track_t;
示例获取轨道数据 libvlc_media_track_t **tracks;int track_count libvlc_media_tracks_get(vlc_media,tracks);for (unsigned i 0; i track_count; i) {libvlc_media_track_t* track tracks[i];// 显示轨道信息printf(Track #%u: %s\n, i, track-psz_description);// 这里可以获取到每一个轨道的信息比如轨道类型 track-i_type// 可能是 libvlc_track_video, libvlc_track_audio 或者 libvlc_track_text (字幕)if (track-i_type libvlc_track_video) {// 处理视频轨道信息qDebug(width %d,track-video-i_width);qDebug(height %d, track-video-i_height);qDebug(rate_num %d, track-video-i_frame_rate_num);qDebug(rate_den %d, track-video-i_frame_rate_den);}else if (track-i_type libvlc_track_audio) {// 处理音频轨道信息qDebug(channels %d, track-audio-i_channels);qDebug(rate %d, track-audio-i_rate);}else if (track-i_type libvlc_track_text) {// 处理字幕轨道信息}}运行截图 打开文件完整示例
void showWidget::slotOpenFile()
{/*选择文件*/QString filename QFileDialog::getOpenFileName(this, 选择打开的文件, D:/, tr(*.*));std::replace(filename.begin(), filename.end(), QChar(/), QChar(\\));vlc_base libvlc_new(0, NULL);vlc_media libvlc_media_new_path(vlc_base, filename.toUtf8().data());if (!vlc_media) {return;}// 创建libvlc实例和媒体播放器vlc_mediaPlayer libvlc_media_player_new_from_media(vlc_media);if (!vlc_mediaPlayer) {return;}// 等待元数据加载完成libvlc_media_parse(vlc_media);// 获取各种元数据const char *title libvlc_media_get_meta(vlc_media, libvlc_meta_Title);const char *artist libvlc_media_get_meta(vlc_media, libvlc_meta_Artist);const char *album libvlc_media_get_meta(vlc_media, libvlc_meta_Album);const char *url libvlc_media_get_meta(vlc_media, libvlc_meta_URL);const char *date libvlc_media_get_meta(vlc_media, libvlc_meta_Date);const char *lang libvlc_media_get_meta(vlc_media, libvlc_meta_Language);int duration libvlc_media_get_duration(vlc_media); // 获取时长单位毫秒qDebug(Title: %s, title ? title : N/A);qDebug(Artist: %s, artist ? artist : N/A);qDebug(Album: %s, album ? album : N/A);qDebug(Duration: %d ms, duration);qDebug(url: %s, url ? url : N/A);qDebug(date: %s, date ? date : N/A);qDebug(lang: %s, lang ? lang : N/A);libvlc_media_track_t **tracks;int track_count libvlc_media_tracks_get(vlc_media,tracks);for (unsigned i 0; i track_count; i) {libvlc_media_track_t* track tracks[i];// 显示轨道信息printf(Track #%u: %s\n, i, track-psz_description);// 这里可以获取到每一个轨道的信息比如轨道类型 track-i_type// 可能是 libvlc_track_video, libvlc_track_audio 或者 libvlc_track_text (字幕)if (track-i_type libvlc_track_video) {// 处理视频轨道信息qDebug(width %d,track-video-i_width);qDebug(height %d, track-video-i_height);qDebug(rate_num %d, track-video-i_frame_rate_num);qDebug(rate_den %d, track-video-i_frame_rate_den);}else if (track-i_type libvlc_track_audio) {// 处理音频轨道信息qDebug(channels %d, track-audio-i_channels);qDebug(rate %d, track-audio-i_rate);}else if (track-i_type libvlc_track_text) {// 处理字幕轨道信息}}设置 logo 叠加//libvlc_video_set_logo_int(vlc_mediaPlayer, libvlc_logo_enable, 1);//libvlc_video_set_logo_string(vlc_mediaPlayer, libvlc_logo_file, D:\\2.png);libvlc_video_set_logo_int(vlc_mediaPlayer, libvlc_logo_position, libvlc_position_top_left);//libvlc_video_set_logo_int(vlc_mediaPlayer, libvlc_logo_x, 100);//libvlc_video_set_logo_int(vlc_mediaPlayer, libvlc_logo_y, 0);//libvlc_video_set_logo_int(vlc_mediaPlayer, libvlc_logo_opacity, 255);//libvlc_video_set_logo_int(vlc_mediaPlayer, libvlc_logo_repeat, 1);创建并设置水印文本//libvlc_video_set_marquee_int(vlc_mediaPlayer, libvlc_marquee_Enable, 1);//libvlc_video_set_marquee_int(vlc_mediaPlayer, libvlc_marquee_Position, libvlc_position_center);//libvlc_video_set_marquee_int(vlc_mediaPlayer, libvlc_marquee_Refresh, 2000);//libvlc_video_set_marquee_int(vlc_mediaPlayer, libvlc_marquee_Size, 24);//libvlc_video_set_marquee_string(vlc_mediaPlayer, libvlc_marquee_Text, 这里是水印文本);libvlc_video_set_marquee_int(w-vlc_mediaPlayer, libvlc_marquee_Timeout, 5000);//libvlc_video_set_marquee_int(vlc_mediaPlayer, libvlc_marquee_Opacity, 255); // 不透明//获取事件管理器libvlc_event_manager_t *em libvlc_media_player_event_manager(vlc_mediaPlayer);// 注册事件监听器libvlc_event_attach(em, libvlc_MediaPlayerTimeChanged, vlcEvents, this);libvlc_event_attach(em, libvlc_MediaPlayerEndReached, vlcEvents, this);libvlc_event_attach(em, libvlc_MediaPlayerStopped, vlcEvents, this);libvlc_event_attach(em, libvlc_MediaPlayerPlaying, vlcEvents, this);libvlc_event_attach(em, libvlc_MediaPlayerPaused, vlcEvents, this);libvlc_media_player_set_hwnd(vlc_mediaPlayer, (void *)ui.widgetShow-winId());QTimer::singleShot(1000, this, showWidget::slotPlay);
}void showWidget::slotPlay()
{if (vlc_mediaPlayer)libvlc_media_player_play(vlc_mediaPlayer);
}
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
