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 static picture_t *GREY_I420_Filter( filter_t *, picture_t * );
  49 static picture_t *GREY_YUY2_Filter( filter_t *, picture_t * );
  50
  51 /*****************************************************************************
  52  * Module descriptor.
  53  *****************************************************************************/
  54 vlc_module_begin();
  55     set_description( N_("Conversions from " SRC_FOURCC " to " DEST_FOURCC) );
  56     set_capability( "video filter2", 80 );
  57     set_callbacks( Activate, NULL );
  58 vlc_module_end();
  59
  60 /*****************************************************************************
  61  * Activate: allocate a chroma function
  62  *****************************************************************************
  63  * This function allocates and initializes a chroma function
  64  *****************************************************************************/
  65 static int Activate( vlc_object_t *p_this )
  66 {
  67     filter_t *p_filter = (filter_t *)p_this;
  68
  69     if( p_filter->fmt_out.video.i_width & 1
  70      || p_filter->fmt_out.video.i_height & 1 )
  71     {
  72         return -1;
  73     }
  74
  75     switch( p_filter->fmt_in.video.i_chroma )
  76     {
  77         case VLC_FOURCC('Y','8','0','0'):
  78             p_filter->fmt_in.video.i_chroma = VLC_FOURCC('G','R','E','Y');
  79         case VLC_FOURCC('G','R','E','Y'):
  80             switch( p_filter->fmt_out.video.i_chroma )
  81             {
  82                 case VLC_FOURCC('I','4','2','0'):
  83                     p_filter->pf_video_filter = GREY_I420_Filter;
  84                     break;
  85                 case VLC_FOURCC('Y','U','Y','2'):
  86                     p_filter->pf_video_filter = GREY_YUY2_Filter;
  87                     break;
  88                 default:
  89                     return -1;
  90             }
  91             break;
  92
  93         default:
  94             return -1;
  95     }
  96
  97     return 0;
  98 }
  99
 100 VIDEO_FILTER_WRAPPER( GREY_I420 )
 101 VIDEO_FILTER_WRAPPER( GREY_YUY2 )
 102
 103 /* Following functions are local */
 104
 105 /*****************************************************************************
 106  * GREY_I420: 8-bit grayscale to planar YUV 4:2:0
 107  *****************************************************************************/
 108 static void GREY_I420( filter_t *p_filter, picture_t *p_source,
 109                                            picture_t *p_dest )
 110 {
 111     uint8_t *p_line = p_source->p->p_pixels;
 112     uint8_t *p_y = p_dest->Y_PIXELS;
 113     uint8_t *p_u = p_dest->U_PIXELS;
 114     uint8_t *p_v = p_dest->V_PIXELS;
 115
 116     int i_x, i_y;
 117
 118     const int i_source_margin = p_source->p->i_pitch
 119                                  - p_source->p->i_visible_pitch;
 120     const int i_dest_margin = p_dest->p[0].i_pitch
 121                                - p_dest->p[0].i_visible_pitch;
 122     const int i_dest_margin_c = p_dest->p[1].i_pitch
 123                                  - p_dest->p[1].i_visible_pitch;
 124
 125     for( i_y = p_filter->fmt_in.video.i_height / 2; i_y-- ; )
 126     {
 127         memset(p_u, 0x80, p_dest->p[1].i_visible_pitch);
 128         p_u += i_dest_margin_c;
 129
 130         memset(p_v, 0x80, p_dest->p[1].i_visible_pitch);
 131         p_v += i_dest_margin_c;
 132     }
 133
 134     for( i_y = p_filter->fmt_in.video.i_height; i_y-- ; )
 135     {
 136         for( i_x = p_filter->fmt_in.video.i_width / 8; i_x-- ; )
 137         {
 138             *p_y++ = *p_line++; *p_y++ = *p_line++;
 139             *p_y++ = *p_line++; *p_y++ = *p_line++;
 140             *p_y++ = *p_line++; *p_y++ = *p_line++;
 141             *p_y++ = *p_line++; *p_y++ = *p_line++;
 142         }
 143
 144         for( i_x = p_filter->fmt_in.video.i_width % 8; i_x-- ; )
 145         {
 146             *p_y++ = *p_line++;
 147         }
 148
 149         p_line += i_source_margin;
 150         p_y += i_dest_margin;
 151     }
 152 }
 153
 154 /*****************************************************************************
 155  * GREY_YUY2: 8-bit grayscale to packed YUY2
 156  *****************************************************************************/
 157 static void GREY_YUY2( filter_t *p_filter, picture_t *p_source,
 158                                            picture_t *p_dest )
 159 {
 160     uint8_t *p_in = p_source->p->p_pixels;
 161     uint8_t *p_out = p_dest->p->p_pixels;
 162
 163     int i_x, i_y;
 164
 165     const int i_source_margin = p_source->p->i_pitch
 166                                  - p_source->p->i_visible_pitch;
 167     const int i_dest_margin = p_dest->p->i_pitch
 168                                - p_dest->p->i_visible_pitch;
 169
 170     for( i_y = p_filter->fmt_out.video.i_height; i_y-- ; )
 171     {
 172         for( i_x = p_filter->fmt_out.video.i_width / 8; i_x-- ; )
 173         {
 174             *p_out++ = *p_in++; *p_out++ = 0x80;
 175             *p_out++ = *p_in++; *p_out++ = 0x80;
 176             *p_out++ = *p_in++; *p_out++ = 0x80;
 177             *p_out++ = *p_in++; *p_out++ = 0x80;
 178             *p_out++ = *p_in++; *p_out++ = 0x80;
 179             *p_out++ = *p_in++; *p_out++ = 0x80;
 180             *p_out++ = *p_in++; *p_out++ = 0x80;
 181             *p_out++ = *p_in++; *p_out++ = 0x80;
 182         }
 183
 184         for( i_x = (p_filter->fmt_out.video.i_width % 8) / 2; i_x-- ; )
 185         {
 186             *p_out++ = *p_in++; *p_out++ = 0x80;
 187             *p_out++ = *p_in++; *p_out++ = 0x80;
 188         }
 189
 190         p_in += i_source_margin;
 191         p_out += i_dest_margin;
 192     }
 193 }
 194