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) 2002-2009 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
  29 #include <aalib.h>
  30
  31 #ifdef HAVE_CONFIG_H
  32 # include "config.h"
  33 #endif
  34
  35 #include <vlc_common.h>
  36 #include <vlc_plugin.h>
  37 #include <vlc_vout.h>
  38 #include <vlc_interface.h>
  39
  40 /*****************************************************************************
  41  * Local prototypes
  42  *****************************************************************************/
  43 static int  Create    ( vlc_object_t * );
  44 static void Destroy   ( vlc_object_t * );
  45
  46 static int  Init      ( vout_thread_t * );
  47 static void End       ( vout_thread_t * );
  48 static int  Manage    ( vout_thread_t * );
  49 static void Render    ( vout_thread_t *, picture_t * );
  50 static void Display   ( vout_thread_t *, picture_t * );
  51
  52 static void SetPalette     ( vout_thread_t *, uint16_t *, uint16_t *, uint16_t * );
  53
  54 /*****************************************************************************
  55  * Module descriptor
  56  *****************************************************************************/
  57 vlc_module_begin ()
  58     set_shortname( N_("ASCII Art"))
  59     set_category( CAT_VIDEO )
  60     set_subcategory( SUBCAT_VIDEO_VOUT )
  61     set_description( N_("ASCII-art video output") )
  62     set_capability( "video output", 10 )
  63     add_shortcut( "aalib" )
  64     set_callbacks( Create, Destroy )
  65 vlc_module_end ()
  66
  67 /*****************************************************************************
  68  * vout_sys_t: aa video output method descriptor
  69  *****************************************************************************
  70  * This structure is part of the video output thread descriptor.
  71  * It describes the aa specific properties of an output thread.
  72  *****************************************************************************/
  73 struct vout_sys_t
  74 {
  75     struct aa_context*  aa_context;
  76     aa_palette          palette;
  77     int                 i_width;                     /* width of main window */
  78     int                 i_height;                   /* height of main window */
  79 };
  80
  81 /*****************************************************************************
  82  * Create: allocates aa video thread output method
  83  *****************************************************************************
  84  * This function allocates and initializes a aa vout method.
  85  *****************************************************************************/
  86 static int Create( vlc_object_t *p_this )
  87 {
  88     vout_thread_t *p_vout = (vout_thread_t *)p_this;
  89
  90     /* Allocate structure */
  91     p_vout->p_sys = malloc( sizeof( vout_sys_t ) );
  92     if( p_vout->p_sys == NULL )
  93         return VLC_ENOMEM;
  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         free( p_vout->p_sys );
 102         return VLC_EGENERIC;
 103     }
 104
 105     p_vout->pf_init = Init;
 106     p_vout->pf_end = End;
 107     p_vout->pf_manage = Manage;
 108     p_vout->pf_render = Render;
 109     p_vout->pf_display = Display;
 110
 111     p_vout->p_sys->i_width = aa_imgwidth(p_vout->p_sys->aa_context);
 112     p_vout->p_sys->i_height = aa_imgheight(p_vout->p_sys->aa_context);
 113     aa_autoinitkbd( p_vout->p_sys->aa_context, 0 );
 114     aa_autoinitmouse( p_vout->p_sys->aa_context, AA_MOUSEPRESSMASK );
 115     aa_hidemouse( p_vout->p_sys->aa_context );
 116
 117     return VLC_SUCCESS;
 118 }
 119
 120 /*****************************************************************************
 121  * Init: initialize aa video thread output method
 122  *****************************************************************************/
 123 static int Init( vout_thread_t *p_vout )
 124 {
 125     int i_index;
 126     picture_t *p_pic = NULL;
 127
 128     I_OUTPUTPICTURES = 0;
 129
 130     p_vout->output.i_chroma = VLC_CODEC_RGB8;
 131     p_vout->output.i_width = p_vout->p_sys->i_width;
 132     p_vout->output.i_height = p_vout->p_sys->i_height;
 133     p_vout->output.i_aspect = p_vout->p_sys->i_width
 134                                * VOUT_ASPECT_FACTOR / p_vout->p_sys->i_height;
 135     p_vout->output.pf_setpalette = SetPalette;
 136
 137     /* Find an empty picture slot */
 138     for( i_index = 0 ; i_index < VOUT_MAX_PICTURES ; i_index++ )
 139     {
 140         if( p_vout->p_picture[ i_index ].i_status == FREE_PICTURE )
 141         {
 142             p_pic = p_vout->p_picture + i_index;
 143             break;
 144         }
 145     }
 146
 147     if( p_pic == NULL )
 148         return VLC_EGENERIC;
 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 VLC_SUCCESS;
 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             var_SetBool( p_vout->p_libvlc, "intf-popupmenu", true );
 205         break;
 206     case AA_RESIZE:
 207         p_vout->i_changes |= VOUT_SIZE_CHANGE;
 208         aa_resize( p_vout->p_sys->aa_context );
 209         p_vout->p_sys->i_width = aa_imgwidth( p_vout->p_sys->aa_context );
 210         p_vout->p_sys->i_height = aa_imgheight( p_vout->p_sys->aa_context );
 211         break;
 212     default:
 213         break;
 214     }
 215     return VLC_SUCCESS;
 216 }
 217
 218 /*****************************************************************************
 219  * Render: render previously calculated output
 220  *****************************************************************************/
 221 static void Render( vout_thread_t *p_vout, picture_t *p_pic )
 222 {
 223   aa_fastrender( p_vout->p_sys->aa_context, 0, 0,
 224                  aa_imgwidth( p_vout->p_sys->aa_context ),
 225                  aa_imgheight( p_vout->p_sys->aa_context ) );
 226 }
 227
 228 /*****************************************************************************
 229  * Display: displays previously rendered output
 230  *****************************************************************************/
 231 static void Display( vout_thread_t *p_vout, picture_t *p_pic )
 232 {
 233     /* No need to do anything, the fake direct buffers stay as they are */
 234     unsigned int i_width, i_height, i_x, i_y;
 235
 236     vout_PlacePicture( p_vout, p_vout->p_sys->i_width, p_vout->p_sys->i_height,
 237                        &i_x, &i_y, &i_width, &i_height );
 238
 239     aa_flush(p_vout->p_sys->aa_context);
 240 }
 241
 242 /*****************************************************************************
 243  * SetPalette: set the 8bpp palette
 244  *****************************************************************************/
 245 static void SetPalette( vout_thread_t *p_vout,
 246                         uint16_t *red, uint16_t *green, uint16_t *blue )
 247 {
 248     int i;
 249
 250     /* Fill colors with color information */
 251     for( i = 0; i < 256; i++ )
 252     {
 253         aa_setpalette( p_vout->p_sys->palette, 256 -i,
 254                        red[ i ], green[ i ], blue[ i ] );
 255     }
 256 }
 257