vlc 代码分析(2)——vlc中vlm介绍

概述

代码从两大部分入手，一个telnet 的deamon。还有就是rtsp的实现部分 。结果发现，他们通过了一个桥梁vlm的media进行沟通。

• 当受到new MEDIANAME vod enabled 就建立一个media。
• 如果受到setup MEDIANAME input filename.mpg 就读入流准备分析，建立input流
• 当受到rtsp的请求后，就建立这个output流

这样，vod就和别的模块一致了。rtsp只是一种output流的module。

代码分析

 

1. /modules/control/telnet.c
/*****************************************************************************
 * Run: main loop
 *****************************************************************************/
static void Run( intf_thread_t *p_intf ){
 vlm_ExecuteCommand( p_sys->mediatheque, cl->buffer_read,
                                         &message );
}

2. /src/Misc/vlm.c 
/*****************************************************************************
 * vlm_ExecuteCommand:
 *****************************************************************************/
int vlm_ExecuteCommand( vlm_t *p_vlm, const char *psz_command,
                        vlm_message_t **pp_message)
{
}

vlm_MediaNew( vlm_t *vlm, const char *psz_name, int i_type ){

 vlm_media_t *media = malloc( sizeof( vlm_media_t ) );
}
*****************************************************
struct vlm_t
{
    VLC_COMMON_MEMBERS

    vlc_mutex_t lock;

    int            i_media;
    vlm_media_t    **media;

    int            i_vod;
    vod_t          *vod;

    int            i_schedule;
    vlm_schedule_t **schedule;
};
*****************************************************
int vlm_MediaSetup( vlm_t *vlm, vlm_media_t *media, const char *psz_cmd,
                    const char *psz_value ){
                   
 if( (p_input = input_CreateThread2( vlm, &media->item, psz_header
                               ) ) )
 {
  while( !p_input->b_eof && !p_input->b_error ) msleep( 100000 );
  
  input_StopThread( p_input );
  input_DestroyThread( p_input );
  vlc_object_detach( p_input );
  vlc_object_destroy( p_input );
 }
}

3. /src/Input/input.c 
input_thread_t *__input_CreateThread2( vlc_object_t *p_parent,
                                       input_item_t *p_item,
                                       char *psz_header )
{
 input_thread_t *p_input = NULL;      /* thread descriptor */ 
 p_input = Create( p_parent, p_item, psz_header, VLC_FALSE );
 /* Now we can attach our new input */
 vlc_object_attach( p_input, p_parent );
 
 /* Create thread and wait for its readiness. */
 if( vlc_thread_create( p_input, "input", Run,
                            VLC_THREAD_PRIORITY_INPUT, VLC_TRUE ) )
 {
  msg_Err( p_input, "cannot create input thread" );
  vlc_object_detach( p_input );
  vlc_object_destroy( p_input );
  return NULL;
 }
}

static input_thread_t *Create( vlc_object_t *p_parent, input_item_t *p_item,
                               char *psz_header, vlc_bool_t b_quick )
{
}

/*****************************************************************************
 * Run: main thread loop
 * This is the "normal" thread that spawns the input processing chain,
 * reads the stream, cleans up and waits
 *****************************************************************************/
static int Run( input_thread_t *p_input )
{
}

=====================================================================================
4. /modules/misc/rtsp.c
static vod_media_t *MediaNew( vod_t *p_vod, const char *psz_name,
                              input_item_t *p_item )
{
    vod_sys_t *p_sys = p_vod->p_sys;
    vod_media_t *p_media = malloc( sizeof(vod_media_t) );
    int i;

    if( !p_media )
    {
        msg_Err( p_vod, "not enough memory" );
        return NULL;
    }

    memset( p_media, 0, sizeof(vod_media_t) );
    p_media->es = 0;
    p_media->psz_mux = 0;
    p_media->rtsp = 0;
    p_media->b_raw = VLC_FALSE;

    asprintf( &p_media->psz_rtsp_path, "%s%s", p_sys->psz_path, psz_name );
    p_media->p_rtsp_url =
        httpd_UrlNewUnique( p_sys->p_rtsp_host, p_media->psz_rtsp_path, NULL,
                            NULL, NULL );

    if( !p_media->p_rtsp_url )
    {
        msg_Err( p_vod, "cannot create RTSP url (%s)", p_media->psz_rtsp_path);
        free( p_media->psz_rtsp_path );
        free( p_media );
        return NULL;
    }

    msg_Dbg( p_vod, "created RTSP url: %s", p_media->psz_rtsp_path );

    asprintf( &p_media->psz_rtsp_control_v4,
               "a=control:rtsp://%%s:%d%s/trackID=%%d/r/n",
               p_sys->i_port, p_media->psz_rtsp_path );
    asprintf( &p_media->psz_rtsp_control_v6,
               "a=control:rtsp://[%%s]:%d%s/trackID=%%d/r/n",
              p_sys->i_port, p_media->psz_rtsp_path );

    httpd_UrlCatch( p_media->p_rtsp_url, HTTPD_MSG_SETUP,
                    RtspCallback, (void*)p_media );
    httpd_UrlCatch( p_media->p_rtsp_url, HTTPD_MSG_DESCRIBE,
                    RtspCallback, (void*)p_media );
    httpd_UrlCatch( p_media->p_rtsp_url, HTTPD_MSG_PLAY,
                    RtspCallback, (void*)p_media );
    httpd_UrlCatch( p_media->p_rtsp_url, HTTPD_MSG_PAUSE,
                    RtspCallback, (void*)p_media );
    httpd_UrlCatch( p_media->p_rtsp_url, HTTPD_MSG_TEARDOWN,
                    RtspCallback, (void*)p_media );
}

static int RtspCallback( httpd_callback_sys_t *p_args, httpd_client_t *cl,
                         httpd_message_t *answer, httpd_message_t *query )
{
    switch( query->i_type )
    {
        case HTTPD_MSG_SETUP:
        {
        }
        case HTTPD_MSG_PLAY:
        {
         p_rtsp = RtspClientGet( p_media, psz_session );
         vod_MediaControl( p_vod, p_media, psz_session, VOD_MEDIA_PLAY,
                               psz_output );
        
 }
     }
         
}

5. vlc_vod.h
static inline int vod_MediaControl( vod_t *p_vod, vod_media_t *p_media,
                                    char *psz_id, int i_query, ... )
{
 i_result = p_vod->pf_media_control( p_vod->p_data, p_media, psz_id,
                                        i_query, args );
}