vout_fb.c

vlc stand 0.1.99 ist sehr einfach

/*****************************************************************************
 * vout_fb.c: Linux framebuffer video output display method
 *****************************************************************************
 * Copyright (C) 1999, 2000 VideoLAN
 *
 * Authors:
 *
 * 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 "defs.h"

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

#include <fcntl.h>                                                 /* open() */
#include <unistd.h>                                               /* close() */
#include <linux/fb.h>
#include <sys/ioctl.h>
#include <sys/mman.h>                                              /* mmap() */

#include "config.h"
#include "common.h"
#include "threads.h"
#include "mtime.h"
#include "plugins.h"

#include "video.h"
#include "video_output.h"

#include "intf_msg.h"
#include "main.h"

/*****************************************************************************
 * vout_sys_t: video output framebuffer method descriptor
 *****************************************************************************
 * This structure is part of the video output thread descriptor.
 * It describes the FB specific properties of an output thread.
 *****************************************************************************/
typedef struct vout_sys_s
{
    /* System informations */
    int                         i_fb_dev;       /* framebuffer device handle */
    struct fb_var_screeninfo    var_info;   /* framebuffer mode informations */

    /* Video memory */
    byte_t *                    p_video;                      /* base adress */
    size_t                      i_page_size;                    /* page size */

    struct fb_cmap              fb_cmap;                /* original colormap */
    unsigned short              *fb_palette;             /* original palette */

} vout_sys_t;

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static int     FBOpenDisplay   ( vout_thread_t *p_vout );
static void    FBCloseDisplay  ( vout_thread_t *p_vout );
static void    FBSetPalette    ( p_vout_thread_t p_vout,
                                 u16 *red, u16 *green, u16 *blue, u16 *transp );

/*****************************************************************************
 * vout_SysCreate: allocates FB video thread output method
 *****************************************************************************
 * This function allocates and initializes a FB vout method.
 *****************************************************************************/
int vout_SysCreate( vout_thread_t *p_vout, char *psz_display,
                    int i_root_window, void *p_data )
{
    /* Allocate structure */
    p_vout->p_sys = malloc( sizeof( vout_sys_t ) );
    if( p_vout->p_sys == NULL )
    {
        intf_ErrMsg("error: %s\n", strerror(ENOMEM) );
        return( 1 );
    }

    /* Open and initialize device */
    if( FBOpenDisplay( p_vout ) )
    {
        intf_ErrMsg("vout error: can't open display\n");
        free( p_vout->p_sys );
        return( 1 );
    }

    return( 0 );
}

/*****************************************************************************
 * vout_SysInit: initialize framebuffer video thread output method
 *****************************************************************************/
int vout_SysInit( vout_thread_t *p_vout )
{
    p_vout->p_set_palette       = FBSetPalette;
    return( 0 );
}

/*****************************************************************************
 * vout_SysEnd: terminate FB video thread output method
 *****************************************************************************/
void vout_SysEnd( vout_thread_t *p_vout )
{
    ;
}

/*****************************************************************************
 * vout_SysDestroy: destroy FB video thread output method
 *****************************************************************************
 * Terminate an output method created by vout_CreateOutputMethod
 *****************************************************************************/
void vout_SysDestroy( vout_thread_t *p_vout )
{
    FBCloseDisplay( p_vout );
    free( p_vout->p_sys );
}

/*****************************************************************************
 * vout_SysManage: handle FB events
 *****************************************************************************
 * This function should be called regularly by video output thread. It manages
 * console events. It returns a non null value on error.
 *****************************************************************************/
int vout_SysManage( vout_thread_t *p_vout )
{
    /*
     * Size change
     */
    if( p_vout->i_changes & VOUT_SIZE_CHANGE )
    {
        intf_DbgMsg("resizing window\n");
        p_vout->i_changes &= ~VOUT_SIZE_CHANGE;

        /* Destroy XImages to change their size */
        vout_SysEnd( p_vout );

        /* Recreate XImages. If SysInit failed, the thread can't go on. */
        if( vout_SysInit( p_vout ) )
        {
            intf_ErrMsg("error: can't resize display\n");
            return( 1 );
        }

#if 1
        /* Tell the video output thread that it will need to rebuild YUV
         * tables. This is needed since conversion buffer size may have changed */
        p_vout->i_changes |= VOUT_YUV_CHANGE;
        intf_Msg("Video display resized (%dx%d)\n", p_vout->i_width, p_vout->i_height);
#endif
    }

    return 0;
}

/*****************************************************************************
 * vout_SysDisplay: displays previously rendered output
 *****************************************************************************
 * This function send the currently rendered image to FB image, waits until
 * it is displayed and switch the two rendering buffers, preparing next frame.
 *****************************************************************************/
void vout_SysDisplay( vout_thread_t *p_vout )
{
    /* swap the two Y offsets */
    p_vout->p_sys->var_info.yoffset = p_vout->i_buffer_index ? p_vout->p_sys->var_info.yres : 0;
    /* the X offset should be 0, but who knows ...
     * some other app might have played with the framebuffer */
    p_vout->p_sys->var_info.xoffset = 0;