xosd.c

来自「VLC媒体播放程序」· C语言 代码 · 共 225 行

/*****************************************************************************
 * xosd.c : X On Screen Display interface
 *****************************************************************************
 * Copyright (C) 2001 VideoLAN
 * $Id: xosd.c,v 1.12 2004/01/25 20:40:59 gbazin Exp $
 *
 * Authors: Lo颿 Minier <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <stdlib.h>                                      /* malloc(), free() */
#include <string.h>

#include <xosd.h>

#include <vlc/intf.h>

#ifdef HAVE_UNISTD_H
#    include <unistd.h>
#endif

/*****************************************************************************
 * intf_sys_t: description and status of rc interface
 *****************************************************************************/
struct intf_sys_t
{
    input_thread_t * p_input;   /* associated input thread */
    xosd * p_osd;               /* libxosd handle */
    char * psz_source;          /* current file || NULL */
};

#define MAX_LINE_LENGTH 256

/*****************************************************************************
 * Local prototypes.
 *****************************************************************************/
static int  Open         ( vlc_object_t * );
static void Close        ( vlc_object_t * );

static void Run          ( intf_thread_t * );

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
#define POSITION_TEXT N_("Flip vertical position")
#define POSITION_LONGTEXT N_("Display xosd output on the bottom of the " \
                             "screen instead of the top")

#define TXT_OFS_TEXT N_("Vertical offset")
#define TXT_OFS_LONGTEXT N_("Vertical offset in pixels of the displayed text")

#define SHD_OFS_TEXT N_("Shadow offset")
#define SHD_OFS_LONGTEXT N_("Offset in pixels of the shadow")

#define FONT_TEXT N_("Font")
#define FONT_LONGTEXT N_("Font used to display text in the xosd output")

vlc_module_begin();
    set_description( _("XOSD interface") );
    add_bool( "xosd-position", 1, NULL, POSITION_TEXT, POSITION_LONGTEXT, VLC_TRUE );
    add_integer( "xosd-text-offset", 0, NULL, TXT_OFS_TEXT, TXT_OFS_LONGTEXT, VLC_TRUE );
    add_integer( "xosd-shadow-offset", 1, NULL,
                 SHD_OFS_TEXT, SHD_OFS_LONGTEXT, VLC_TRUE );
    add_string( "xosd-font", "-misc-fixed-medium-r-*-*-*-300-*-*-*-*-*-*",
                NULL, FONT_TEXT, FONT_LONGTEXT, VLC_TRUE );
    set_capability( "interface", 10 );
    set_callbacks( Open, Close );
vlc_module_end();

/*****************************************************************************
 * Open: initialize and create stuff
 *****************************************************************************/
static int Open( vlc_object_t *p_this )
{
    intf_thread_t *p_intf = (intf_thread_t *)p_this;

    /* Allocate instance and initialize some members */
    p_intf->p_sys = (intf_sys_t *)malloc( sizeof( intf_sys_t ) );
    if( p_intf->p_sys == NULL )
    {
        msg_Err( p_intf, "out of memory" );
        return VLC_ENOMEM;
    }

    if( getenv( "DISPLAY" ) == NULL )
    {
        msg_Err( p_intf, "no display, please set the DISPLAY variable" );
        return VLC_EGENERIC;
    }

    /* Initialize library */
    p_intf->p_sys->p_osd =
#if defined(HAVE_XOSD_VERSION_0) || defined(HAVE_XOSD_VERSION_1)
        xosd_init( config_GetPsz( p_intf, "xosd-font" ),
                   "LawnGreen", 3, XOSD_top, 0, 1 );
#else
        xosd_init( config_GetPsz( p_intf, "xosd-font" ),
                   "LawnGreen", 3, XOSD_top, 0, 0, 1 );
#endif

    if( p_intf->p_sys->p_osd == NULL )
    {
        msg_Err( p_intf, "couldn't initialize libxosd" );
        return VLC_EGENERIC;
    }

    /* Initialize to NULL */
    p_intf->p_sys->psz_source = NULL;

    xosd_display( p_intf->p_sys->p_osd,
                  0,
                  XOSD_string,
                  "xosd interface initialized" );

    p_intf->pf_run = Run;

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Close: destroy interface stuff
 *****************************************************************************/
static void Close( vlc_object_t *p_this )
{
    intf_thread_t *p_intf = (intf_thread_t *)p_this;

    if( p_intf->p_sys->psz_source ) free( p_intf->p_sys->psz_source );

    /* Uninitialize library */
    xosd_uninit( p_intf->p_sys->p_osd );

    /* Destroy structure */
    free( p_intf->p_sys );
}

/*****************************************************************************
 * Run: xosd thread
 *****************************************************************************
 * This part of the interface runs in a separate thread
 *****************************************************************************/
static void Run( intf_thread_t *p_intf )
{
    p_intf->p_sys->p_input = NULL;

    while( !p_intf->b_die )
    {
        /* Manage the input part */
        if( p_intf->p_sys->p_input == NULL )
        {
            p_intf->p_sys->p_input = vlc_object_find( p_intf, VLC_OBJECT_INPUT,
                                                              FIND_ANYWHERE );
        }
        else if( p_intf->p_sys->p_input->b_dead )
        {
            vlc_object_release( p_intf->p_sys->p_input );
            p_intf->p_sys->p_input = NULL;
        }
        else /* We have a valid input */
        {
            /* Did source change? */
            if ( (p_intf->p_sys->psz_source == NULL)
                 || (strcmp( p_intf->p_sys->psz_source,
                             p_intf->p_sys->p_input->psz_source ) != 0)
               )
            {
                if( p_intf->p_sys->psz_source )
                    free( p_intf->p_sys->psz_source );

                p_intf->p_sys->psz_source =
                    strdup( p_intf->p_sys->p_input->psz_source );

                /* Set user preferences */
                xosd_set_font( p_intf->p_sys->p_osd,
                               config_GetPsz( p_intf, "xosd-font" ) );
#ifdef HAVE_XOSD_VERSION_2
                xosd_set_horizontal_offset( p_intf->p_sys->p_osd,
                    config_GetInt( p_intf, "xosd-text-offset" ) );
                xosd_set_vertical_offset( p_intf->p_sys->p_osd,
                    config_GetInt( p_intf, "xosd-text-offset" ) );
#else
                xosd_set_offset( p_intf->p_sys->p_osd,
                    config_GetInt( p_intf, "xosd-text-offset" ) );
#endif
                xosd_set_shadow_offset( p_intf->p_sys->p_osd,
                    config_GetInt( p_intf, "xosd-shadow-offset" ));
                xosd_set_pos( p_intf->p_sys->p_osd,
                    config_GetInt( p_intf, "xosd-position" ) ? XOSD_bottom
                                                             : XOSD_top );

                /* Display */
                xosd_display( p_intf->p_sys->p_osd,
                              0,                               /* first line */
                              XOSD_string,
                              p_intf->p_sys->psz_source );
            }
        }

        msleep( INTF_IDLE_SLEEP );
    }

    if( p_intf->p_sys->p_input )
    {
        vlc_object_release( p_intf->p_sys->p_input );
        p_intf->p_sys->p_input = NULL;
    }

}