ggi.c

video linux conference

/*****************************************************************************
 * ggi.c : GGI plugin for vlc
 *****************************************************************************
 * Copyright (C) 2000, 2001 VideoLAN
 * $Id: ggi.c 10101 2005-03-02 16:47:31Z robux4 $
 *
 * Authors: Vincent Seguin <[e-mail]>
 *          Samuel Hocevar <[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 <errno.h>                                                 /* ENOMEM */

#include <ggi/ggi.h>

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

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static int  Create    ( vlc_object_t * );
static void Destroy   ( 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 void SetPalette     ( vout_thread_t *, uint16_t *, uint16_t *, uint16_t * );

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
#define DISPLAY_TEXT N_("X11 display name")
#define DISPLAY_LONGTEXT N_( \
            "Specify the X11 hardware display you want to use.\n" \
            "By default, VLC will use the value of the DISPLAY " \
            "environment variable.")

vlc_module_begin();
    add_string( "ggi-display", NULL, NULL, DISPLAY_TEXT, DISPLAY_LONGTEXT, VLC_TRUE );
    set_description( "General Graphics Interface video output" );
    set_capability( "video output", 30 );
    set_callbacks( Create, Destroy );
vlc_module_end();

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

    ggi_mode            mode;                             /* mode descriptor */
    int                 i_bits_per_pixel;

    /* Buffer information */
    ggi_directbuffer *  pp_buffer[2];                             /* buffers */
    int                 i_index;

    vlc_bool_t          b_must_acquire;   /* must be acquired before writing */
};

/*****************************************************************************
 * Create: allocate GGI video thread output method
 *****************************************************************************
 * This function allocate and initialize a GGI 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 Create( vlc_object_t *p_this )
{
    vout_thread_t *p_vout = (vout_thread_t *)p_this;

    /* Allocate structure */
    p_vout->p_sys = malloc( sizeof( vout_sys_t ) );
    if( p_vout->p_sys == NULL )
    {
        msg_Err( p_vout, "out of memory" );
        return( 1 );
    }

    /* Open and initialize device */
    if( OpenDisplay( p_vout ) )
    {
        msg_Err( p_vout, "cannot initialize GGI display" );
        free( p_vout->p_sys );
        return( 1 );
    }

    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;

    return( 0 );
}

/*****************************************************************************
 * Init: initialize GGI video thread output method
 *****************************************************************************
 * This function initialize the GGI display device.
 *****************************************************************************/
static int Init( vout_thread_t *p_vout )
{
#define p_b p_vout->p_sys->pp_buffer
    int i_index;
    picture_t *p_pic;

    I_OUTPUTPICTURES = 0;

    p_vout->output.i_width  = p_vout->p_sys->mode.visible.x;
    p_vout->output.i_height = p_vout->p_sys->mode.visible.y;
    p_vout->output.i_aspect = p_vout->p_sys->mode.visible.x
                               * VOUT_ASPECT_FACTOR
                               / p_vout->p_sys->mode.visible.y;

    switch( p_vout->p_sys->i_bits_per_pixel )
    {
        case 8:
            p_vout->output.i_chroma = VLC_FOURCC('R','G','B','2');
            p_vout->output.pf_setpalette = SetPalette;
            break;
        case 15:
            p_vout->output.i_chroma = VLC_FOURCC('R','V','1','5'); break;
        case 16:
            p_vout->output.i_chroma = VLC_FOURCC('R','V','1','6'); break;
        case 24:
            p_vout->output.i_chroma = VLC_FOURCC('R','V','2','4'); break;
        case 32:
            p_vout->output.i_chroma = VLC_FOURCC('R','V','3','2'); break;
        default:
            msg_Err( p_vout, "unknown screen depth %i",
                     p_vout->p_sys->i_bits_per_pixel );
            return 0;
    }

    /* Only useful for bits_per_pixel != 8 */
    p_vout->output.i_rmask = p_b[ 0 ]->buffer.plb.pixelformat->red_mask;
    p_vout->output.i_gmask = p_b[ 0 ]->buffer.plb.pixelformat->green_mask;
    p_vout->output.i_bmask = p_b[ 0 ]->buffer.plb.pixelformat->blue_mask;

    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;
        }
    }

    if( p_pic == NULL )
    {
        return 0;
    }

    /* We know the chroma, allocate a buffer which will be used
     * directly by the decoder */
    p_vout->p_sys->i_index = 0;
    p_pic->p->p_pixels = p_b[ 0 ]->write;
    p_pic->p->i_pixel_pitch = p_b[ 0 ]->buffer.plb.pixelformat->size / 8;
    p_pic->p->i_lines = p_vout->p_sys->mode.visible.y;
    p_pic->p->i_visible_lines = p_vout->p_sys->mode.visible.y;

    p_pic->p->i_pitch = p_b[ 0 ]->buffer.plb.stride;

    if( p_b[ 0 ]->buffer.plb.pixelformat->size / 8
         * p_vout->p_sys->mode.visible.x
        != p_b[ 0 ]->buffer.plb.stride )
    {
        p_pic->p->i_visible_pitch = p_b[ 0 ]->buffer.plb.pixelformat->size
                                     / 8 * p_vout->p_sys->mode.visible.x;
    }
    else
    {
        p_pic->p->i_visible_pitch = p_b[ 0 ]->buffer.plb.stride;
    }

    p_pic->i_planes = 1;

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

    PP_OUTPUTPICTURE[ I_OUTPUTPICTURES ] = p_pic;

    I_OUTPUTPICTURES++;

    /* Acquire first buffer */
    if( p_vout->p_sys->b_must_acquire )
    {
        ggiResourceAcquire( p_b[ 0 ]->resource,
                            GGI_ACTYPE_WRITE );
    }

    /* Listen to the keyboard and the mouse buttons */
    ggiSetEventMask( p_vout->p_sys->p_display,
                     emKeyboard | emPtrButtonPress | emPtrButtonRelease );

    /* Set asynchronous display mode -- usually quite faster */
    ggiAddFlags( p_vout->p_sys->p_display, GGIFLAG_ASYNC );

    return( 0 );
#undef p_b
}

/*****************************************************************************
 * End: terminate GGI video thread output method
 *****************************************************************************
 * Terminate an output method created by Create
 *****************************************************************************/
static void End( vout_thread_t *p_vout )
{
#define p_b p_vout->p_sys->pp_buffer
    /* Release buffer */
    if( p_vout->p_sys->b_must_acquire )
    {
        ggiResourceRelease( p_b[ p_vout->p_sys->i_index ]->resource );
    }
#undef p_b
}

/*****************************************************************************
 * Destroy: destroy GGI video thread output method
 *****************************************************************************
 * Terminate an output method created by Create
 *****************************************************************************/
static void Destroy( vlc_object_t *p_this )
{
    vout_thread_t *p_vout = (vout_thread_t *)p_this;

    CloseDisplay( p_vout );

    free( p_vout->p_sys );
}

/*****************************************************************************
 * Manage: handle GGI events
 *****************************************************************************
 * This function should be called regularly by video output thread. It returns