git.sesse.net Git - vlc/blob - modules/video_output/aa.c

   1 /*****************************************************************************
   2  * vout_aa.c: Aa video output display method for testing purposes
   3  *****************************************************************************
   4  * Copyright (C) 2002 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Sigmund Augdal Helberg <dnumgis@videolan.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <errno.h>                                                 /* ENOMEM */
  28 #include <stdlib.h>                                                /* free() */
  29 #include <string.h>                                            /* strerror() */
  30
  31 #include <aalib.h>
  32
  33 #include <vlc/vlc.h>
  34 #include <vlc_vout.h>
  35 #include <vlc_interface.h>
  36
  37 /*****************************************************************************
  38  * Local prototypes
  39  *****************************************************************************/
  40 static int  Create    ( vlc_object_t * );
  41 static void Destroy   ( vlc_object_t * );
  42
  43 static int  Init      ( vout_thread_t * );
  44 static void End       ( vout_thread_t * );
  45 static int  Manage    ( vout_thread_t * );
  46 static void Render    ( vout_thread_t *, picture_t * );
  47 static void Display   ( vout_thread_t *, picture_t * );
  48
  49 static void SetPalette     ( vout_thread_t *, uint16_t *, uint16_t *, uint16_t * );
  50
  51 /*****************************************************************************
  52  * Module descriptor
  53  *****************************************************************************/
  54 vlc_module_begin();
  55     set_shortname( _("ASCII Art"));
  56     set_category( CAT_VIDEO );
  57     set_subcategory( SUBCAT_VIDEO_VOUT );
  58     set_description( _("ASCII-art video output") );
  59     set_capability( "video output", 10 );
  60     add_shortcut( "aalib" );
  61     set_callbacks( Create, Destroy );
  62 vlc_module_end();
  63
  64 /*****************************************************************************
  65  * vout_sys_t: aa video output method descriptor
  66  *****************************************************************************
  67  * This structure is part of the video output thread descriptor.
  68  * It describes the aa specific properties of an output thread.
  69  *****************************************************************************/
  70 struct vout_sys_t
  71 {
  72     struct aa_context*  aa_context;
  73     aa_palette          palette;
  74     int                 i_width;                     /* width of main window */
  75     int                 i_height;                   /* height of main window */
  76 };
  77
  78 /*****************************************************************************
  79  * Create: allocates aa video thread output method
  80  *****************************************************************************
  81  * This function allocates and initializes a aa vout method.
  82  *****************************************************************************/
  83 static int Create( vlc_object_t *p_this )
  84 {
  85     vout_thread_t *p_vout = (vout_thread_t *)p_this;
  86
  87     /* Allocate structure */
  88     p_vout->p_sys = malloc( sizeof( vout_sys_t ) );
  89     if( p_vout->p_sys == NULL )
  90     {
  91         msg_Err( p_vout, "out of memory" );
  92         return( 1 );
  93     }
  94
  95     /* Don't parse any options, but take $AAOPTS into account */
  96     aa_parseoptions( NULL, NULL, NULL, NULL );
  97
  98     if (!(p_vout->p_sys->aa_context = aa_autoinit(&aa_defparams)))
  99     {
 100         msg_Err( p_vout, "cannot initialize aalib" );
 101         return( 1 );
 102     }
 103
 104     p_vout->pf_init = Init;
 105     p_vout->pf_end = End;
 106     p_vout->pf_manage = Manage;
 107     p_vout->pf_render = Render;
 108     p_vout->pf_display = Display;
 109
 110     p_vout->p_sys->i_width = aa_imgwidth(p_vout->p_sys->aa_context);
 111     p_vout->p_sys->i_height = aa_imgheight(p_vout->p_sys->aa_context);
 112     aa_autoinitkbd( p_vout->p_sys->aa_context, 0 );
 113     aa_autoinitmouse( p_vout->p_sys->aa_context, AA_MOUSEPRESSMASK );
 114     aa_hidemouse( p_vout->p_sys->aa_context );
 115     return( 0 );
 116 }
 117
 118 /*****************************************************************************
 119  * Init: initialize aa video thread output method
 120  *****************************************************************************/
 121 static int Init( vout_thread_t *p_vout )
 122 {
 123     int i_index;
 124     picture_t *p_pic = NULL;
 125
 126     I_OUTPUTPICTURES = 0;
 127
 128     p_vout->output.i_chroma = VLC_FOURCC('R','G','B','2');
 129     p_vout->output.i_width = p_vout->p_sys->i_width;
 130     p_vout->output.i_height = p_vout->p_sys->i_height;
 131     p_vout->output.i_aspect = p_vout->p_sys->i_width
 132                                * VOUT_ASPECT_FACTOR / p_vout->p_sys->i_height;
 133     p_vout->output.pf_setpalette = SetPalette;
 134
 135     /* Find an empty picture slot */
 136     for( i_index = 0 ; i_index < VOUT_MAX_PICTURES ; i_index++ )
 137     {
 138         if( p_vout->p_picture[ i_index ].i_status == FREE_PICTURE )
 139         {
 140             p_pic = p_vout->p_picture + i_index;
 141             break;
 142         }
 143     }
 144
 145     if( p_pic == NULL )
 146     {
 147         return -1;
 148     }
 149
 150     /* Allocate the picture */
 151     p_pic->p->p_pixels = aa_image( p_vout->p_sys->aa_context );
 152     p_pic->p->i_lines = p_vout->p_sys->i_height;
 153     p_pic->p->i_visible_lines = p_vout->p_sys->i_height;
 154     p_pic->p->i_pitch = p_vout->p_sys->i_width;
 155     p_pic->p->i_pixel_pitch = 1;
 156     p_pic->p->i_visible_pitch = p_vout->p_sys->i_width;
 157     p_pic->i_planes = 1;
 158
 159     p_pic->i_status = DESTROYED_PICTURE;
 160     p_pic->i_type   = DIRECT_PICTURE;
 161
 162     PP_OUTPUTPICTURE[ I_OUTPUTPICTURES ] = p_pic;
 163     I_OUTPUTPICTURES++;
 164
 165     return 0;
 166 }
 167
 168 /*****************************************************************************
 169  * End: terminate aa video thread output method
 170  *****************************************************************************/
 171 static void End( vout_thread_t *p_vout )
 172 {
 173     ;
 174 }
 175
 176 /*****************************************************************************
 177  * Destroy: destroy aa video thread output method
 178  *****************************************************************************
 179  * Terminate an output method created by AaCreateOutputMethod
 180  *****************************************************************************/
 181 static void Destroy( vlc_object_t *p_this )
 182 {
 183     vout_thread_t *p_vout = (vout_thread_t *)p_this;
 184
 185     aa_close( p_vout->p_sys->aa_context );
 186     free( p_vout->p_sys );
 187 }
 188
 189 /*****************************************************************************
 190  * Manage: handle aa events
 191  *****************************************************************************
 192  * This function should be called regularly by video output thread. It manages
 193  * console events. It returns a non null value on error.
 194  *****************************************************************************/
 195 static int Manage( vout_thread_t *p_vout )
 196 {
 197     int event, x, y, b;
 198     event = aa_getevent( p_vout->p_sys->aa_context, 0 );
 199     switch ( event )
 200     {
 201     case AA_MOUSE:
 202         aa_getmouse( p_vout->p_sys->aa_context, &x, &y, &b );
 203         if ( b & AA_BUTTON3 )
 204         {
 205             intf_thread_t *p_intf;
 206             p_intf = vlc_object_find( p_vout, VLC_OBJECT_INTF, FIND_ANYWHERE );
 207             if( p_intf )
 208             {
 209                 p_intf->b_menu_change = 1;
 210                 vlc_object_release( p_intf );
 211             }
 212         }
 213         break;
 214     case AA_RESIZE:
 215         p_vout->i_changes |= VOUT_SIZE_CHANGE;
 216         aa_resize( p_vout->p_sys->aa_context );
 217         p_vout->p_sys->i_width = aa_imgwidth( p_vout->p_sys->aa_context );
 218         p_vout->p_sys->i_height = aa_imgheight( p_vout->p_sys->aa_context );
 219         break;
 220     default:
 221         break;
 222     }
 223     return( 0 );
 224 }
 225
 226 /*****************************************************************************
 227  * Render: render previously calculated output
 228  *****************************************************************************/
 229 static void Render( vout_thread_t *p_vout, picture_t *p_pic )
 230 {
 231   aa_fastrender( p_vout->p_sys->aa_context, 0, 0,
 232                  aa_imgwidth( p_vout->p_sys->aa_context ),
 233                  aa_imgheight( p_vout->p_sys->aa_context ) );
 234 }
 235
 236 /*****************************************************************************
 237  * Display: displays previously rendered output
 238  *****************************************************************************/
 239 static void Display( vout_thread_t *p_vout, picture_t *p_pic )
 240 {
 241     /* No need to do anything, the fake direct buffers stay as they are */
 242     int i_width, i_height, i_x, i_y;
 243
 244     vout_PlacePicture( p_vout, p_vout->p_sys->i_width, p_vout->p_sys->i_height,
 245                        &i_x, &i_y, &i_width, &i_height );
 246
 247     aa_flush(p_vout->p_sys->aa_context);
 248 }
 249
 250 /*****************************************************************************
 251  * SetPalette: set the 8bpp palette
 252  *****************************************************************************/
 253 static void SetPalette( vout_thread_t *p_vout,
 254                         uint16_t *red, uint16_t *green, uint16_t *blue )
 255 {
 256     int i;
 257
 258     /* Fill colors with color information */
 259     for( i = 0; i < 256; i++ )
 260     {
 261         aa_setpalette( p_vout->p_sys->palette, 256 -i,
 262                        red[ i ], green[ i ], blue[ i ] );
 263     }
 264 }
 265