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