git.sesse.net Git - vlc/blob - modules/video_chroma/grey_yuv.c

   1 /*****************************************************************************
   2  * grey_yuv.c : grayscale to others conversion module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2007, 2008 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Sam Hocevar <sam@zoy.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
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_filter.h>
  35 #include <vlc_vout.h>
  36
  37 #define SRC_FOURCC  "GREY"
  38 #define DEST_FOURCC "I420,YUY2"
  39
  40 /*****************************************************************************
  41  * Local and extern prototypes.
  42  *****************************************************************************/
  43 static int  Activate ( vlc_object_t * );
  44
  45 static void GREY_I420( filter_t *, picture_t *, picture_t * );
  46 static void GREY_YUY2( filter_t *, picture_t *, picture_t * );
  47
  48 /*****************************************************************************
  49  * Module descriptor.
  50  *****************************************************************************/
  51 vlc_module_begin();
  52     set_description( N_("Conversions from " SRC_FOURCC " to " DEST_FOURCC) );
  53     set_capability( "chroma", 80 );
  54     set_callbacks( Activate, NULL );
  55 vlc_module_end();
  56
  57 /*****************************************************************************
  58  * Activate: allocate a chroma function
  59  *****************************************************************************
  60  * This function allocates and initializes a chroma function
  61  *****************************************************************************/
  62 static int Activate( vlc_object_t *p_this )
  63 {
  64     filter_t *p_filter = (filter_t *)p_this;
  65
  66     if( p_filter->fmt_out.video.i_width & 1
  67      || p_filter->fmt_out.video.i_height & 1 )
  68     {
  69         return -1;
  70     }
  71
  72     switch( p_filter->fmt_in.video.i_chroma )
  73     {
  74         case VLC_FOURCC('Y','8','0','0'):
  75             p_filter->fmt_in.video.i_chroma = VLC_FOURCC('G','R','E','Y');
  76         case VLC_FOURCC('G','R','E','Y'):
  77             switch( p_filter->fmt_out.video.i_chroma )
  78             {
  79                 case VLC_FOURCC('I','4','2','0'):
  80                     p_filter->pf_video_filter_io = GREY_I420;
  81                     break;
  82                 case VLC_FOURCC('Y','U','Y','2'):
  83                     p_filter->pf_video_filter_io = GREY_YUY2;
  84                     break;
  85                 default:
  86                     return -1;
  87             }
  88             break;
  89
  90         default:
  91             return -1;
  92     }
  93
  94     return 0;
  95 }
  96
  97 /* Following functions are local */
  98
  99 /*****************************************************************************
 100  * GREY_I420: 8-bit grayscale to planar YUV 4:2:0
 101  *****************************************************************************/
 102 static void GREY_I420( filter_t *p_filter, picture_t *p_source,
 103                                            picture_t *p_dest )
 104 {
 105     uint8_t *p_line = p_source->p->p_pixels;
 106     uint8_t *p_y = p_dest->Y_PIXELS;
 107     uint8_t *p_u = p_dest->U_PIXELS;
 108     uint8_t *p_v = p_dest->V_PIXELS;
 109
 110     int i_x, i_y;
 111
 112     const int i_source_margin = p_source->p->i_pitch
 113                                  - p_source->p->i_visible_pitch;
 114     const int i_dest_margin = p_dest->p[0].i_pitch
 115                                - p_dest->p[0].i_visible_pitch;
 116     const int i_dest_margin_c = p_dest->p[1].i_pitch
 117                                  - p_dest->p[1].i_visible_pitch;
 118
 119     for( i_y = p_filter->fmt_in.video.i_height / 2; i_y-- ; )
 120     {
 121         memset(p_u, 0x80, p_dest->p[1].i_visible_pitch);
 122         p_u += i_dest_margin_c;
 123
 124         memset(p_v, 0x80, p_dest->p[1].i_visible_pitch);
 125         p_v += i_dest_margin_c;
 126     }
 127
 128     for( i_y = p_filter->fmt_in.video.i_height; i_y-- ; )
 129     {
 130         for( i_x = p_filter->fmt_in.video.i_width / 8; i_x-- ; )
 131         {
 132             *p_y++ = *p_line++; *p_y++ = *p_line++;
 133             *p_y++ = *p_line++; *p_y++ = *p_line++;
 134             *p_y++ = *p_line++; *p_y++ = *p_line++;
 135             *p_y++ = *p_line++; *p_y++ = *p_line++;
 136         }
 137
 138         for( i_x = p_filter->fmt_in.video.i_width % 8; i_x-- ; )
 139         {
 140             *p_y++ = *p_line++;
 141         }
 142
 143         p_line += i_source_margin;
 144         p_y += i_dest_margin;
 145     }
 146 }
 147
 148 /*****************************************************************************
 149  * GREY_YUY2: 8-bit grayscale to packed YUY2
 150  *****************************************************************************/
 151 static void GREY_YUY2( filter_t *p_filter, picture_t *p_source,
 152                                            picture_t *p_dest )
 153 {
 154     uint8_t *p_in = p_source->p->p_pixels;
 155     uint8_t *p_out = p_dest->p->p_pixels;
 156
 157     int i_x, i_y;
 158
 159     const int i_source_margin = p_source->p->i_pitch
 160                                  - p_source->p->i_visible_pitch;
 161     const int i_dest_margin = p_dest->p->i_pitch
 162                                - p_dest->p->i_visible_pitch;
 163
 164     for( i_y = p_filter->fmt_out.video.i_height; i_y-- ; )
 165     {
 166         for( i_x = p_filter->fmt_out.video.i_width / 8; i_x-- ; )
 167         {
 168             *p_out++ = *p_in++; *p_out++ = 0x80;
 169             *p_out++ = *p_in++; *p_out++ = 0x80;
 170             *p_out++ = *p_in++; *p_out++ = 0x80;
 171             *p_out++ = *p_in++; *p_out++ = 0x80;
 172             *p_out++ = *p_in++; *p_out++ = 0x80;
 173             *p_out++ = *p_in++; *p_out++ = 0x80;
 174             *p_out++ = *p_in++; *p_out++ = 0x80;
 175             *p_out++ = *p_in++; *p_out++ = 0x80;
 176         }
 177
 178         for( i_x = (p_filter->fmt_out.video.i_width % 8) / 2; i_x-- ; )
 179         {
 180             *p_out++ = *p_in++; *p_out++ = 0x80;
 181             *p_out++ = *p_in++; *p_out++ = 0x80;
 182         }
 183
 184         p_in += i_source_margin;
 185         p_out += i_dest_margin;
 186     }
 187 }
 188