VLC 简要

最新推荐文章于 2024-08-08 08:29:28 发布

ybugchen

最新推荐文章于 2024-08-08 08:29:28 发布

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分类专栏： MPEG4 文章标签： audio object stream video thread output

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本文主要介绍了VLC的核心部分LibVLC，它是一个提供多种功能接口的库，包括流访问、音视频输出等。还阐述了LibVLC各模块的功能，如用户交互、播放列表管理等，同时介绍了播放列表模块的文件及相关函数。

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Chapter 1. VLC Overview
Table of Contents
LibVLC
VLC
Modules
Threads
Code conventions

LibVLC
LibVLC is the core part of VLC,It is a library providing an interface for programs such as VLC of a lot of functionalities such as stream access,audio and video output,plugin handing, a thread system. All the LibVLC source files are located int the src./ directory and its subdirectories:
----- interface/: contains code for user interaction such as key presses and device ejection.
----- playlist/:    managers playlist interaction such as stop,play,next, or randow playback.
----- input/:        opens an input module,read packets, pares them and passes reconstituted elementary
streams to the decoder(s).
----- video_output:/ initializes the video display, gets all pictures and subpictures (ie. subtiles) from the
   decoder(s), optinally convents them to another format (such as YUV to RGB), and display
them.
----- audio_output/: initializes the audio mixer, ie. finds the right playing frequency, and the resamples
audio frames received from the decoder(s).
----- stream_output/: TODO
----- misc/:       miscellaneous utilities used in other parts of libvlc, such as the thread system, the message
queue,CPU detection,the object lookup system, or platform-specific code.

Data flow between modules

I. playlist
playlist module include six files : playlist.c,sort.c,group.c,info.c,item.c,item_ext.c

    |---playlist.c

    |         |------------- playlist_t * __playlist_Create ( vlc_object_t *p_parent )
|         |                  建立一个 playlist 对象，初始化playlist_t sturct 相关的值
|         |                  加载相关模块和功能
    |         |                  相关函数：
    |         |                   int __var_Create( vlc_object_t *p_this, const char *psz_name, int i_type );
    |         |                  int __var_Set( vlc_object_t *p_this, const char *psz_name, vlc_value_t val );
    |         |------------- void playlist_Destroy( playlist_t * p_playlist )
    |         |                   释放playlist_t 对象，和卸载相关模块
    |         |