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 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_vout.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           ( vout_thread_t *, picture_t *, picture_t * );
  45 static void GREY_YUY2           ( vout_thread_t *, picture_t *, picture_t * );
  46
  47 /*****************************************************************************
  48  * Module descriptor.
  49  *****************************************************************************/
  50 vlc_module_begin();
  51     set_description( N_("Conversions from " SRC_FOURCC " to " DEST_FOURCC) );
  52     set_capability( "chroma", 80 );
  53     set_callbacks( Activate, NULL );
  54 vlc_module_end();
  55
  56 /*****************************************************************************
  57  * Activate: allocate a chroma function
  58  *****************************************************************************
  59  * This function allocates and initializes a chroma function
  60  *****************************************************************************/
  61 static int Activate( vlc_object_t *p_this )
  62 {
  63     vout_thread_t *p_vout = (vout_thread_t *)p_this;
  64
  65     if( p_vout->render.i_width & 1 || p_vout->render.i_height & 1 )
  66     {
  67         return -1;
  68     }
  69
  70     switch( p_vout->render.i_chroma )
  71     {
  72         case VLC_FOURCC('Y','8','0','0'):
  73             p_vout->render.i_chroma = VLC_FOURCC('G','R','E','Y');
  74         case VLC_FOURCC('G','R','E','Y'):
  75             switch( p_vout->output.i_chroma )
  76             {
  77                 case VLC_FOURCC('I','4','2','0'):
  78                     p_vout->chroma.pf_convert = GREY_I420;
  79                     break;
  80                 case VLC_FOURCC('Y','U','Y','2'):
  81                     p_vout->chroma.pf_convert = GREY_YUY2;
  82                     break;
  83                 default:
  84                     return -1;
  85             }
  86             break;
  87
  88         default:
  89             return -1;
  90     }
  91
  92     return 0;
  93 }
  94
  95 /* Following functions are local */
  96
  97 /*****************************************************************************
  98  * GREY_I420: 8-bit grayscale to planar YUV 4:2:0
  99  *****************************************************************************/
 100 static void GREY_I420( vout_thread_t *p_vout, picture_t *p_source,
 101                                               picture_t *p_dest )
 102 {
 103     uint8_t *p_line = p_source->p->p_pixels;
 104     uint8_t *p_y = p_dest->Y_PIXELS;
 105     uint8_t *p_u = p_dest->U_PIXELS;
 106     uint8_t *p_v = p_dest->V_PIXELS;
 107
 108     int i_x, i_y;
 109
 110     const int i_source_margin = p_source->p->i_pitch
 111                                  - p_source->p->i_visible_pitch;
 112     const int i_dest_margin = p_dest->p[0].i_pitch
 113                                - p_dest->p[0].i_visible_pitch;
 114     const int i_dest_margin_c = p_dest->p[1].i_pitch
 115                                  - p_dest->p[1].i_visible_pitch;
 116
 117     for( i_y = p_vout->render.i_height / 2; i_y-- ; )
 118     {
 119         memset(p_u, 0x80, p_dest->p[1].i_visible_pitch);
 120         p_u += i_dest_margin_c;
 121
 122         memset(p_v, 0x80, p_dest->p[1].i_visible_pitch);
 123         p_v += i_dest_margin_c;
 124     }
 125
 126     for( i_y = p_vout->render.i_height; i_y-- ; )
 127     {
 128         for( i_x = p_vout->render.i_width / 8; i_x-- ; )
 129         {
 130             *p_y++ = *p_line++; *p_y++ = *p_line++;
 131             *p_y++ = *p_line++; *p_y++ = *p_line++;
 132             *p_y++ = *p_line++; *p_y++ = *p_line++;
 133             *p_y++ = *p_line++; *p_y++ = *p_line++;
 134         }
 135
 136         for( i_x = p_vout->render.i_width % 8; i_x-- ; )
 137         {
 138             *p_y++ = *p_line++;
 139         }
 140
 141         p_line += i_source_margin;
 142         p_y += i_dest_margin;
 143     }
 144 }
 145
 146 /*****************************************************************************
 147  * GREY_YUY2: 8-bit grayscale to packed YUY2
 148  *****************************************************************************/
 149 static void GREY_YUY2( vout_thread_t *p_vout, picture_t *p_source,
 150                                               picture_t *p_dest )
 151 {
 152     uint8_t *p_in = p_source->p->p_pixels;
 153     uint8_t *p_out = p_dest->p->p_pixels;
 154
 155     int i_x, i_y;
 156
 157     const int i_source_margin = p_source->p->i_pitch
 158                                  - p_source->p->i_visible_pitch;
 159     const int i_dest_margin = p_dest->p->i_pitch
 160                                - p_dest->p->i_visible_pitch;
 161
 162     for( i_y = p_vout->render.i_height; i_y-- ; )
 163     {
 164         for( i_x = p_vout->render.i_width / 8; i_x-- ; )
 165         {
 166             *p_out++ = *p_in++; *p_out++ = 0x80;
 167             *p_out++ = *p_in++; *p_out++ = 0x80;
 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         }
 175
 176         for( i_x = (p_vout->render.i_width % 8) / 2; i_x-- ; )
 177         {
 178             *p_out++ = *p_in++; *p_out++ = 0x80;
 179             *p_out++ = *p_in++; *p_out++ = 0x80;
 180         }
 181
 182         p_in += i_source_margin;
 183         p_out += i_dest_margin;
 184     }
 185 }
 186