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
  36 #define SRC_FOURCC  "GREY"
  37 #define DEST_FOURCC "I420,YUY2"
  38
  39 /*****************************************************************************
  40  * Local and extern prototypes.
  41  *****************************************************************************/
  42 static int  Activate ( vlc_object_t * );
  43
  44 static void GREY_I420( filter_t *, picture_t *, picture_t * );
  45 static void GREY_YUY2( filter_t *, picture_t *, picture_t * );
  46
  47 static picture_t *GREY_I420_Filter( filter_t *, picture_t * );
  48 static picture_t *GREY_YUY2_Filter( filter_t *, picture_t * );
  49
  50 /*****************************************************************************
  51  * Module descriptor.
  52  *****************************************************************************/
  53 vlc_module_begin ()
  54     set_description( N_("Conversions from " SRC_FOURCC " to " DEST_FOURCC) )
  55     set_capability( "video filter2", 80 )
  56     set_callbacks( Activate, NULL )
  57 vlc_module_end ()
  58
  59 /*****************************************************************************
  60  * Activate: allocate a chroma function
  61  *****************************************************************************
  62  * This function allocates and initializes a chroma function
  63  *****************************************************************************/
  64 static int Activate( vlc_object_t *p_this )
  65 {
  66     filter_t *p_filter = (filter_t *)p_this;
  67
  68     if( p_filter->fmt_out.video.i_width & 1
  69      || p_filter->fmt_out.video.i_height & 1 )
  70     {
  71         return -1;
  72     }
  73
  74     if( p_filter->fmt_in.video.i_width != p_filter->fmt_out.video.i_width
  75      || p_filter->fmt_in.video.i_height != p_filter->fmt_out.video.i_height )
  76         return -1;
  77
  78     switch( p_filter->fmt_in.video.i_chroma )
  79     {
  80         case VLC_CODEC_GREY:
  81             switch( p_filter->fmt_out.video.i_chroma )
  82             {
  83                 case VLC_CODEC_I420:
  84                     p_filter->pf_video_filter = GREY_I420_Filter;
  85                     break;
  86                 case VLC_CODEC_YUYV:
  87                     p_filter->pf_video_filter = GREY_YUY2_Filter;
  88                     break;
  89                 default:
  90                     return -1;
  91             }
  92             break;
  93
  94         default:
  95             return -1;
  96     }
  97
  98     return 0;
  99 }
 100
 101 VIDEO_FILTER_WRAPPER( GREY_I420 )
 102 VIDEO_FILTER_WRAPPER( GREY_YUY2 )
 103
 104 /* Following functions are local */
 105
 106 /*****************************************************************************
 107  * GREY_I420: 8-bit grayscale to planar YUV 4:2:0
 108  *****************************************************************************/
 109 static void GREY_I420( filter_t *p_filter, picture_t *p_source,
 110                                            picture_t *p_dest )
 111 {
 112     uint8_t *p_line = p_source->p->p_pixels;
 113     uint8_t *p_y = p_dest->Y_PIXELS;
 114     uint8_t *p_u = p_dest->U_PIXELS;
 115     uint8_t *p_v = p_dest->V_PIXELS;
 116
 117     int i_x, i_y;
 118
 119     const int i_source_margin = p_source->p->i_pitch
 120                                  - p_source->p->i_visible_pitch;
 121     const int i_dest_margin = p_dest->p[0].i_pitch
 122                                - p_dest->p[0].i_visible_pitch;
 123     const int i_dest_margin_c = p_dest->p[1].i_pitch
 124                                  - p_dest->p[1].i_visible_pitch;
 125
 126     for( i_y = p_filter->fmt_in.video.i_height / 2; i_y-- ; )
 127     {
 128         memset(p_u, 0x80, p_dest->p[1].i_visible_pitch);
 129         p_u += i_dest_margin_c;
 130
 131         memset(p_v, 0x80, p_dest->p[1].i_visible_pitch);
 132         p_v += i_dest_margin_c;
 133     }
 134
 135     for( i_y = p_filter->fmt_in.video.i_height; i_y-- ; )
 136     {
 137         for( i_x = p_filter->fmt_in.video.i_width / 8; i_x-- ; )
 138         {
 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             *p_y++ = *p_line++; *p_y++ = *p_line++;
 143         }
 144
 145         for( i_x = p_filter->fmt_in.video.i_width % 8; i_x-- ; )
 146         {
 147             *p_y++ = *p_line++;
 148         }
 149
 150         p_line += i_source_margin;
 151         p_y += i_dest_margin;
 152     }
 153 }
 154
 155 /*****************************************************************************
 156  * GREY_YUY2: 8-bit grayscale to packed YUY2
 157  *****************************************************************************/
 158 static void GREY_YUY2( filter_t *p_filter, picture_t *p_source,
 159                                            picture_t *p_dest )
 160 {
 161     uint8_t *p_in = p_source->p->p_pixels;
 162     uint8_t *p_out = p_dest->p->p_pixels;
 163
 164     int i_x, i_y;
 165
 166     const int i_source_margin = p_source->p->i_pitch
 167                                  - p_source->p->i_visible_pitch;
 168     const int i_dest_margin = p_dest->p->i_pitch
 169                                - p_dest->p->i_visible_pitch;
 170
 171     for( i_y = p_filter->fmt_out.video.i_height; i_y-- ; )
 172     {
 173         for( i_x = p_filter->fmt_out.video.i_width / 8; i_x-- ; )
 174         {
 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             *p_out++ = *p_in++; *p_out++ = 0x80;
 183         }
 184
 185         for( i_x = (p_filter->fmt_out.video.i_width % 8) / 2; i_x-- ; )
 186         {
 187             *p_out++ = *p_in++; *p_out++ = 0x80;
 188             *p_out++ = *p_in++; *p_out++ = 0x80;
 189         }
 190
 191         p_in += i_source_margin;
 192         p_out += i_dest_margin;
 193     }
 194 }
 195