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aa.c：源码内容
							/*****************************************************************************
 * vout_aa.c: Aa video output display method for testing purposes
 *****************************************************************************
 * Copyright (C) 2002-2009 the VideoLAN team
 * $Id: 0e256851465e28b1d0f2f7c3c4fa5016bd95588c $
 *
 * Authors: Sigmund Augdal Helberg <dnumgis@videolan.org>
 *
 * 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 <aalib.h>
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_vout.h>
#include <vlc_interface.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 Render    ( vout_thread_t *, picture_t * );
static void Display   ( vout_thread_t *, picture_t * );
static void SetPalette     ( vout_thread_t *, uint16_t *, uint16_t *, uint16_t * );
/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
vlc_module_begin ()
    set_shortname( N_("ASCII Art"))
    set_category( CAT_VIDEO )
    set_subcategory( SUBCAT_VIDEO_VOUT )
    set_description( N_("ASCII-art video output") )
    set_capability( "video output", 10 )
    add_shortcut( "aalib" )
    set_callbacks( Create, Destroy )
vlc_module_end ()
/*****************************************************************************
 * vout_sys_t: aa video output method descriptor
 *****************************************************************************
 * This structure is part of the video output thread descriptor.
 * It describes the aa specific properties of an output thread.
 *****************************************************************************/
struct vout_sys_t
{
    struct aa_context*  aa_context;
    aa_palette          palette;
    int                 i_width;                     /* width of main window */
    int                 i_height;                   /* height of main window */
};
/*****************************************************************************
 * Create: allocates aa video thread output method
 *****************************************************************************
 * This function allocates and initializes a aa vout method.
 *****************************************************************************/
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 )
        return VLC_ENOMEM;
    /* Don't parse any options, but take $AAOPTS into account */
    aa_parseoptions( NULL, NULL, NULL, NULL );
    if (!(p_vout->p_sys->aa_context = aa_autoinit(&aa_defparams)))
    {
        msg_Err( p_vout, "cannot initialize aalib" );
        free( p_vout->p_sys );
        return VLC_EGENERIC;
    }
    p_vout->pf_init = Init;
    p_vout->pf_end = End;
    p_vout->pf_manage = Manage;
    p_vout->pf_render = Render;
    p_vout->pf_display = Display;
    p_vout->p_sys->i_width = aa_imgwidth(p_vout->p_sys->aa_context);
    p_vout->p_sys->i_height = aa_imgheight(p_vout->p_sys->aa_context);
    aa_autoinitkbd( p_vout->p_sys->aa_context, 0 );
    aa_autoinitmouse( p_vout->p_sys->aa_context, AA_MOUSEPRESSMASK );
    aa_hidemouse( p_vout->p_sys->aa_context );
    return VLC_SUCCESS;
}
/*****************************************************************************
 * Init: initialize aa video thread output method
 *****************************************************************************/
static int Init( vout_thread_t *p_vout )
{
    int i_index;
    picture_t *p_pic = NULL;
    I_OUTPUTPICTURES = 0;
    p_vout->output.i_chroma = VLC_FOURCC('R','G','B','2');
    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->p_sys->i_width
                               * VOUT_ASPECT_FACTOR / p_vout->p_sys->i_height;
    p_vout->output.pf_setpalette = SetPalette;
    /* 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 VLC_EGENERIC;
    /* Allocate the picture */
    p_pic->p->p_pixels = aa_image( p_vout->p_sys->aa_context );
    p_pic->p->i_lines = p_vout->p_sys->i_height;
    p_pic->p->i_visible_lines = p_vout->p_sys->i_height;
    p_pic->p->i_pitch = p_vout->p_sys->i_width;
    p_pic->p->i_pixel_pitch = 1;
    p_pic->p->i_visible_pitch = p_vout->p_sys->i_width;
    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++;
    return VLC_SUCCESS;
}
/*****************************************************************************
 * End: terminate aa video thread output method
 *****************************************************************************/
static void End( vout_thread_t *p_vout )
{
    ;
}
/*****************************************************************************
 * Destroy: destroy aa video thread output method
 *****************************************************************************
 * Terminate an output method created by AaCreateOutputMethod
 *****************************************************************************/
static void Destroy( vlc_object_t *p_this )
{
    vout_thread_t *p_vout = (vout_thread_t *)p_this;
    aa_close( p_vout->p_sys->aa_context );
    free( p_vout->p_sys );
}
/*****************************************************************************
 * Manage: handle aa events
 *****************************************************************************
 * This function should be called regularly by video output thread. It manages
 * console events. It returns a non null value on error.
 *****************************************************************************/
static int Manage( vout_thread_t *p_vout )
{
    int event, x, y, b;
    event = aa_getevent( p_vout->p_sys->aa_context, 0 );
    switch ( event )
    {
    case AA_MOUSE:
        aa_getmouse( p_vout->p_sys->aa_context, &x, &y, &b );
        if ( b & AA_BUTTON3 )
            var_SetBool( p_vout->p_libvlc, "intf-popupmenu", true );
        break;
    case AA_RESIZE:
        p_vout->i_changes |= VOUT_SIZE_CHANGE;
        aa_resize( p_vout->p_sys->aa_context );
        p_vout->p_sys->i_width = aa_imgwidth( p_vout->p_sys->aa_context );
        p_vout->p_sys->i_height = aa_imgheight( p_vout->p_sys->aa_context );
        break;
    default:
        break;
    }
    return VLC_SUCCESS;
}
/*****************************************************************************
 * Render: render previously calculated output
 *****************************************************************************/
static void Render( vout_thread_t *p_vout, picture_t *p_pic )
{
  aa_fastrender( p_vout->p_sys->aa_context, 0, 0,
                 aa_imgwidth( p_vout->p_sys->aa_context ),
                 aa_imgheight( p_vout->p_sys->aa_context ) );
}
/*****************************************************************************
 * Display: displays previously rendered output
 *****************************************************************************/
static void Display( vout_thread_t *p_vout, picture_t *p_pic )
{
    /* No need to do anything, the fake direct buffers stay as they are */
    int i_width, i_height, i_x, i_y;
    vout_PlacePicture( p_vout, p_vout->p_sys->i_width, p_vout->p_sys->i_height,
                       &i_x, &i_y, &i_width, &i_height );
    aa_flush(p_vout->p_sys->aa_context);
}
/*****************************************************************************
 * SetPalette: set the 8bpp palette
 *****************************************************************************/
static void SetPalette( vout_thread_t *p_vout,
                        uint16_t *red, uint16_t *green, uint16_t *blue )
{
    int i;
    /* Fill colors with color information */
    for( i = 0; i < 256; i++ )
    {
        aa_setpalette( p_vout->p_sys->palette, 256 -i,
                       red[ i ], green[ i ], blue[ i ] );
    }
}

						