sdl.c

uclinux 下的vlc播放器源代码

/*****************************************************************************
 * sdl.c: SDL video output display method
 *****************************************************************************
 * Copyright (C) 1998-2001 the VideoLAN team
 * $Id: sdl.c 16987 2006-10-08 12:54:12Z jpsaman $
 *
 * Authors: Samuel Hocevar <[e-mail]>
 *          Pierre Baillet <[e-mail]>
 *          Arnaud de Bossoreille de Ribou <[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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <errno.h>                                                 /* ENOMEM */
#include <stdlib.h>                                                /* free() */
#include <string.h>                                            /* strerror() */

#include <vlc/vlc.h>
#include <vlc/intf.h>
#include <vlc/vout.h>
#include <vlc/aout.h>

#include <sys/types.h>
#ifndef WIN32
#   include <netinet/in.h>                            /* BSD: struct in_addr */
#endif

#include SDL_INCLUDE_FILE

/* SDL is not able to crop overlays - so use only 1 direct buffer */
#define SDL_MAX_DIRECTBUFFERS 1
#define SDL_DEFAULT_BPP 16

/*****************************************************************************
 * vout_sys_t: video output SDL method descriptor
 *****************************************************************************
 * This structure is part of the video output thread descriptor.
 * It describes the SDL specific properties of an output thread.
 *****************************************************************************/
struct vout_sys_t
{
    SDL_Surface *   p_display;                             /* display device */

    int i_width;
    int i_height;

    /* For YUV output */
    SDL_Overlay * p_overlay;   /* An overlay we keep to grab the XVideo port */

    /* For RGB output */
    int i_surfaces;

    vlc_bool_t  b_cursor;
    vlc_bool_t  b_cursor_autohidden;
    mtime_t     i_lastmoved;
    mtime_t     i_lastpressed;                        /* to track dbl-clicks */
};

/*****************************************************************************
 * picture_sys_t: direct buffer method descriptor
 *****************************************************************************
 * This structure is part of the picture descriptor, it describes the
 * SDL specific properties of a direct buffer.
 *****************************************************************************/
struct picture_sys_t
{
    SDL_Overlay *p_overlay;
};

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static int  Open      ( vlc_object_t * );
static void Close     ( vlc_object_t * );
static int  Init      ( vout_thread_t * );
static void End       ( vout_thread_t * );
static int  Manage    ( vout_thread_t * );
static void Display   ( vout_thread_t *, picture_t * );

static int  OpenDisplay     ( vout_thread_t * );
static void CloseDisplay    ( vout_thread_t * );
static int  NewPicture      ( vout_thread_t *, picture_t * );
static void SetPalette      ( vout_thread_t *,
                              uint16_t *, uint16_t *, uint16_t * );

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
vlc_module_begin();
    set_shortname( "SDL" );
    set_category( CAT_VIDEO );
    set_subcategory( SUBCAT_VIDEO_VOUT );
    set_description( _("Simple DirectMedia Layer video output") );
    set_capability( "video output", 60 );
    add_shortcut( "sdl" );
    set_callbacks( Open, Close );
    /* XXX: check for conflicts with the SDL audio output */
    var_Create( p_module->p_libvlc, "sdl", VLC_VAR_MUTEX );
#if defined( __i386__ ) || defined( __x86_64__ )
    /* On i386, SDL is linked against svgalib */
    linked_with_a_crap_library_which_uses_atexit();
#endif
vlc_module_end();

/*****************************************************************************
 * OpenVideo: allocate SDL video thread output method
 *****************************************************************************
 * This function allocate and initialize a SDL vout method. It uses some of the
 * vout properties to choose the correct mode, and change them according to the
 * mode actually used.
 *****************************************************************************/
static int Open ( vlc_object_t *p_this )
{
    vout_thread_t * p_vout = (vout_thread_t *)p_this;
    vlc_value_t lockval;

#ifdef HAVE_SETENV
    char *psz_method;
#endif

    var_Get( p_this->p_libvlc, "sdl", &lockval );
    vlc_mutex_lock( lockval.p_address );

    if( SDL_WasInit( SDL_INIT_VIDEO ) != 0 )
    {
        vlc_mutex_unlock( lockval.p_address );
        return VLC_EGENERIC;
    }

    /* Allocate structure */
    p_vout->p_sys = malloc( sizeof( vout_sys_t ) );
    if( p_vout->p_sys == NULL )
    {
        msg_Err( p_vout, "out of memory" );
        vlc_mutex_unlock( lockval.p_address );
        return VLC_ENOMEM;
    }

    p_vout->pf_init = Init;
    p_vout->pf_end = End;
    p_vout->pf_manage = Manage;
    p_vout->pf_render = NULL;
    p_vout->pf_display = Display;

#ifdef HAVE_SETENV
    psz_method = config_GetPsz( p_vout, "vout" );
    if( psz_method )
    {
        while( *psz_method && *psz_method != ':' )
        {
            psz_method++;
        }

        if( *psz_method )
        {
            setenv( "SDL_VIDEODRIVER", psz_method + 1, 1 );
        }
    }
#endif

    /* Initialize library */
    if( SDL_Init( SDL_INIT_VIDEO
#ifndef WIN32
    /* Win32 SDL implementation doesn't support SDL_INIT_EVENTTHREAD yet*/
                | SDL_INIT_EVENTTHREAD
#endif
#ifdef DEBUG
    /* In debug mode you may want vlc to dump a core instead of staying
     * stuck */
                | SDL_INIT_NOPARACHUTE
#endif
                ) < 0 )
    {
        msg_Err( p_vout, "cannot initialize SDL (%s)", SDL_GetError() );
        free( p_vout->p_sys );
        vlc_mutex_unlock( lockval.p_address );
        return VLC_EGENERIC;
    }

    vlc_mutex_unlock( lockval.p_address );

    p_vout->p_sys->b_cursor = 1;
    p_vout->p_sys->b_cursor_autohidden = 0;
    p_vout->p_sys->i_lastmoved = mdate();

    if( OpenDisplay( p_vout ) )
    {
        msg_Err( p_vout, "cannot set up SDL (%s)", SDL_GetError() );
        SDL_QuitSubSystem( SDL_INIT_VIDEO );
        free( p_vout->p_sys );
        return VLC_EGENERIC;
    }

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Init: initialize SDL video thread output method
 *****************************************************************************
 * This function initialize the SDL display device.
 *****************************************************************************/
static int Init( vout_thread_t *p_vout )
{
    int i_index;
    picture_t *p_pic;

    p_vout->p_sys->i_surfaces = 0;

    I_OUTPUTPICTURES = 0;

    /* Initialize the output structure */
    if( p_vout->p_sys->p_overlay == NULL )
    {
        /* All we have is an RGB image with square pixels */
        p_vout->output.i_width  = p_vout->p_sys->i_width;
        p_vout->output.i_height = p_vout->p_sys->i_height;
        p_vout->output.i_aspect = p_vout->output.i_width
                                   * VOUT_ASPECT_FACTOR
                                   / p_vout->output.i_height;
    }
    else
    {
        /* We may need to convert the chroma, but at least we keep the
         * aspect ratio */
        p_vout->output.i_width  = p_vout->render.i_width;
        p_vout->output.i_height = p_vout->render.i_height;
        p_vout->output.i_aspect = p_vout->render.i_aspect;
    }

    /* Try to initialize SDL_MAX_DIRECTBUFFERS direct buffers */
    while( I_OUTPUTPICTURES < SDL_MAX_DIRECTBUFFERS )
    {
        p_pic = NULL;

        /* Find an empty picture slot */
        for( i_index = 0 ; i_index < VOUT_MAX_PICTURES ; i_index++ )
        {
            if( p_vout->p_picture[ i_index ].i_status == FREE_PICTURE )
            {
                p_pic = p_vout->p_picture + i_index;
                break;
            }
        }

        /* Allocate the picture if we found one */
        if( p_pic == NULL || NewPicture( p_vout, p_pic ) )
        {
            break;
        }

        p_pic->i_status = DESTROYED_PICTURE;
        p_pic->i_type   = DIRECT_PICTURE;

        PP_OUTPUTPICTURE[ I_OUTPUTPICTURES ] = p_pic;

        I_OUTPUTPICTURES++;
    }

    return VLC_SUCCESS;
}

/*****************************************************************************
 * End: terminate Sys video thread output method
 *****************************************************************************
 * Terminate an output method created by OpenVideo
 *****************************************************************************/
static void End( vout_thread_t *p_vout )
{
    int i_index;

    /* Free the output buffers we allocated */
    for( i_index = I_OUTPUTPICTURES ; i_index ; )
    {
        i_index--;
        if( p_vout->p_sys->p_overlay == NULL )
        {
            /* RGB picture */
        }
        else
        {
            SDL_UnlockYUVOverlay(
                    PP_OUTPUTPICTURE[ i_index ]->p_sys->p_overlay );
            SDL_FreeYUVOverlay(
                    PP_OUTPUTPICTURE[ i_index ]->p_sys->p_overlay );
        }
        free( PP_OUTPUTPICTURE[ i_index ]->p_sys );
    }
}

/*****************************************************************************
 * CloseVideo: destroy Sys video thread output method
 *****************************************************************************
 * Terminate an output method created by vout_SDLCreate
 *****************************************************************************/
static void Close ( vlc_object_t *p_this )
{
    vout_thread_t * p_vout = (vout_thread_t *)p_this;