vout_mga.c

vlc stand 0.1.99 ist sehr einfach

/*****************************************************************************
 * vout_mga.c: MGA video output display method
 *****************************************************************************
 * Copyright (C) 1998, 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 <sys/ioctl.h>                                            /* ioctl() */
#include <sys/mman.h>                                          /* PROT_WRITE */

#ifdef SYS_BSD
#include <sys/types.h>                                     /* typedef ushort */
#endif

#include <sys/shm.h>                                   /* shmget(), shmctl() */
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/extensions/XShm.h>

#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 "vout_mga.h"

/*****************************************************************************
 * vout_SysCreate: allocate X11 video thread output method
 *****************************************************************************
 * This function allocate and initialize a X11 vout method. It uses some of the
 * vout properties to choose the window size, and change them according to the
 * actual properties of the display.
 *****************************************************************************/
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 );
    }

    /* Allocate MGA configuration structure */
    p_vout->p_sys->p_mga = malloc( sizeof( mga_vid_config_t ) );
    if( p_vout->p_sys->p_mga == NULL )
    {
        intf_ErrMsg("error: %s\n", strerror(ENOMEM) );
        free( p_vout->p_sys );
        return( 1 );
    }

    if( (p_vout->p_sys->i_fd = open("/dev/mga_vid",O_RDWR)) == -1 )
    {
        intf_ErrMsg("error: can't open MGA driver /dev/mga_vid\n" );
        free( p_vout->p_sys->p_mga );
        free( p_vout->p_sys );
        return( 1 );
    }

    /* Open and initialize device. This function issues its own error messages.
     * Since XLib is usually not thread-safe, we can't use the same display
     * pointer than the interface or another thread. However, the root window
     * id is still valid. */
    if( X11OpenDisplay( p_vout, psz_display, i_root_window ) )
    {
        intf_ErrMsg("error: can't initialize X11 display\n" );
        free( p_vout->p_sys->p_mga );
        free( p_vout->p_sys );
        return( 1 );
    }

    return( 0 );
}

/*****************************************************************************
 * vout_SysInit: initialize X11 video thread output method
 *****************************************************************************
 * This function create the XImages needed by the output thread. It is called
 * at the beginning of the thread, but also each time the window is resized.
 *****************************************************************************/
int vout_SysInit( vout_thread_t *p_vout )
{
    int i_err, i_dummy;

    /* create the MGA output */
    p_vout->p_sys->p_mga->src_width = p_vout->i_width;
    p_vout->p_sys->p_mga->src_height = p_vout->i_height;
    /* FIXME: we should initialize these ones according to the streams */
    p_vout->p_sys->p_mga->dest_width = p_vout->i_width;
    p_vout->p_sys->p_mga->dest_height = p_vout->i_height;
    //p_vout->p_sys->p_mga->dest_width = 400;
    //p_vout->p_sys->p_mga->dest_height = 300;
    p_vout->p_sys->p_mga->x_org = 100;
    p_vout->p_sys->p_mga->y_org = 100;
    p_vout->p_sys->p_mga->colkey_on = 0;

    if( ioctl(p_vout->p_sys->i_fd, MGA_VID_CONFIG, p_vout->p_sys->p_mga) )
    {
        intf_ErrMsg("error in config ioctl\n");
    }

    if (p_vout->p_sys->p_mga->card_type == MGA_G200)
    {
        intf_Msg( "detected MGA G200 (%d MB Ram)\n",
                  p_vout->p_sys->p_mga->ram_size );
        p_vout->p_sys->b_g400 = 0;
    }
    else
    {
        intf_Msg( "detected MGA G400 (%d MB Ram)\n",
                  p_vout->p_sys->p_mga->ram_size );
        p_vout->p_sys->b_g400 = 1;
    }

    ioctl( p_vout->p_sys->i_fd, MGA_VID_ON, 0 );

    p_vout->p_sys->i_size = ( (p_vout->p_sys->p_mga->src_width + 31) & ~31 )
                             * p_vout->p_sys->p_mga->src_height;

    p_vout->p_sys->p_mga_vid_base = mmap( 0, p_vout->p_sys->i_size
                                             + p_vout->p_sys->i_size / 2,
                                          PROT_WRITE, MAP_SHARED,
                                          p_vout->p_sys->i_fd, 0 );

    memset( p_vout->p_sys->p_mga_vid_base,
            0x00, p_vout->p_sys->i_size );

    memset( p_vout->p_sys->p_mga_vid_base + p_vout->p_sys->i_size,
            0x80, p_vout->p_sys->i_size / 2 );

    /* Create XImages using XShm extension - on failure, fall back to regular
     * way (and destroy the first image if it was created successfully) */
    if( p_vout->p_sys->b_shm )
    {
        /* Create first image */
        i_err = X11CreateShmImage( p_vout, &p_vout->p_sys->p_ximage[0],
                                   &p_vout->p_sys->shm_info[0] );
        if( !i_err )                         /* first image has been created */
        {
            /* Create second image */
            if( X11CreateShmImage( p_vout, &p_vout->p_sys->p_ximage[1],
                                   &p_vout->p_sys->shm_info[1] ) )
            {                             /* error creating the second image */
                X11DestroyShmImage( p_vout, p_vout->p_sys->p_ximage[0],
                                    &p_vout->p_sys->shm_info[0] );
                i_err = 1;
            }
        }
        if( i_err )                                      /* an error occured */
        {
            intf_Msg("XShm video sextension desactivated\n" );
            p_vout->p_sys->b_shm = 0;
        }
    }

    /* Create XImages without XShm extension */
    if( !p_vout->p_sys->b_shm )
    {
        if( X11CreateImage( p_vout, &p_vout->p_sys->p_ximage[0] ) )
        {
            intf_ErrMsg("error: can't create images\n");
            p_vout->p_sys->p_ximage[0] = NULL;
            p_vout->p_sys->p_ximage[1] = NULL;
            return( 1 );
        }
        if( X11CreateImage( p_vout, &p_vout->p_sys->p_ximage[1] ) )
        {
            intf_ErrMsg("error: can't create images\n");
            X11DestroyImage( p_vout->p_sys->p_ximage[0] );
            p_vout->p_sys->p_ximage[0] = NULL;
            p_vout->p_sys->p_ximage[1] = NULL;
            return( 1 );
        }
    }

    /* Set bytes per line and initialize buffers */
    p_vout->i_bytes_per_line = p_vout->p_sys->p_ximage[0]->bytes_per_line;
    vout_SetBuffers( p_vout, p_vout->p_sys->p_ximage[ 0 ]->data,
                     p_vout->p_sys->p_ximage[ 1 ]->data );
    return( 0 );
}

/*****************************************************************************
 * vout_SysEnd: terminate X11 video thread output method
 *****************************************************************************
 * Destroy the X11 XImages created by vout_SysInit. It is called at the end of
 * the thread, but also each time the window is resized.
 *****************************************************************************/
void vout_SysEnd( vout_thread_t *p_vout )
{
    if( p_vout->p_sys->b_shm )                             /* Shm XImages... */
    {
        X11DestroyShmImage( p_vout, p_vout->p_sys->p_ximage[0],
                            &p_vout->p_sys->shm_info[0] );
        X11DestroyShmImage( p_vout, p_vout->p_sys->p_ximage[1],
                            &p_vout->p_sys->shm_info[1] );
    }
    else                                          /* ...or regular XImages */
    {
        X11DestroyImage( p_vout->p_sys->p_ximage[0] );
        X11DestroyImage( p_vout->p_sys->p_ximage[1] );
    }
}

/*****************************************************************************
 * vout_SysDestroy: destroy X11 video thread output method
 *****************************************************************************
 * Terminate an output method created by vout_CreateOutputMethod
 *****************************************************************************/
void vout_SysDestroy( vout_thread_t *p_vout )
{
    X11CloseDisplay( p_vout );

    ioctl( p_vout->p_sys->i_fd, MGA_VID_OFF, 0 );
    close( p_vout->p_sys->i_fd );

    free( p_vout->p_sys->p_mga );
    free( p_vout->p_sys );
}

/*****************************************************************************
 * vout_SysManage: handle X11 events
 *****************************************************************************
 * This function should be called regularly by video output thread. It manages
 * X11 events and allows window resizing. It returns a non null value on
 * error.
 *****************************************************************************/
int vout_SysManage( vout_thread_t *p_vout )
{
    /*
     * Color/Grayscale or gamma change: in 8bpp, just change the colormap
     */
    if( (p_vout->i_changes & VOUT_GRAYSCALE_CHANGE) && (p_vout->i_screen_depth == 8) )
    {
        /* FIXME: clear flags ?? */
    }

    /*
     * Size change
     */
    if( p_vout->i_changes & VOUT_SIZE_CHANGE )
    {
        intf_DbgMsg("resizing window\n");
        p_vout->i_changes &= ~VOUT_SIZE_CHANGE;

        /* Resize window */
        XResizeWindow( p_vout->p_sys->p_display, p_vout->p_sys->window,
                       p_vout->i_width, p_vout->i_height );

        /* 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 );
        }

        /* Tell the video output thread that it will need to rebuild YUV
         * tables. This is needed since convertion 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);
    }

    return 0;
}

/*****************************************************************************
 * vout_SysDisplay: displays previously rendered output
 *****************************************************************************
 * This function send the currently rendered image to X11 server, wait until
 * it is displayed and switch the two rendering buffer, preparing next frame.
 *****************************************************************************/
void vout_SysDisplay( vout_thread_t *p_vout )
{
    if( p_vout->p_sys->b_shm)                                /* XShm is used */
    {
        /* Display rendered image using shared memory extension */
        XShmPutImage(p_vout->p_sys->p_display, p_vout->p_sys->window, p_vout->p_sys->gc,
                     p_vout->p_sys->p_ximage[ p_vout->i_buffer_index ],
                     0, 0, 0, 0,
                     p_vout->p_sys->p_ximage[ p_vout->i_buffer_index ]->width,
                     p_vout->p_sys->p_ximage[ p_vout->i_buffer_index ]->height, True);

        /* Send the order to the X server */
        XFlush(p_vout->p_sys->p_display);
    }
    else                                /* regular X11 capabilities are used */
    {
        XPutImage(p_vout->p_sys->p_display, p_vout->p_sys->window, p_vout->p_sys->gc,
                  p_vout->p_sys->p_ximage[ p_vout->i_buffer_index ],
                  0, 0, 0, 0,
                  p_vout->p_sys->p_ximage[ p_vout->i_buffer_index ]->width,
                  p_vout->p_sys->p_ximage[ p_vout->i_buffer_index ]->height);

        /* Send the order to the X server */
        XFlush(p_vout->p_sys->p_display);
    }
}

/* following functions are local */

/*****************************************************************************
 * X11OpenDisplay: open and initialize X11 device
 *****************************************************************************
 * Create a window according to video output given size, and set other
 * properties according to the display properties.
 *****************************************************************************/
static int X11OpenDisplay( vout_thread_t *p_vout, char *psz_display, Window root_window )
{