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 #include <stdlib.h>                                      /* malloc(), free() */
  29
  30 #include <vlc/vlc.h>
  31 #include <vlc_vout.h>
  32
  33 #define SRC_FOURCC  "GREY"
  34 #define DEST_FOURCC "I420,YUY2"
  35
  36 /*****************************************************************************
  37  * Local and extern prototypes.
  38  *****************************************************************************/
  39 static int  Activate ( vlc_object_t * );
  40
  41 static void GREY_I420           ( vout_thread_t *, picture_t *, picture_t * );
  42 static void GREY_YUY2           ( vout_thread_t *, picture_t *, picture_t * );
  43
  44 /*****************************************************************************
  45  * Module descriptor.
  46  *****************************************************************************/
  47 vlc_module_begin();
  48     set_description( _("Conversions from " SRC_FOURCC " to " DEST_FOURCC) );
  49     set_capability( "chroma", 80 );
  50     set_callbacks( Activate, NULL );
  51 vlc_module_end();
  52
  53 /*****************************************************************************
  54  * Activate: allocate a chroma function
  55  *****************************************************************************
  56  * This function allocates and initializes a chroma function
  57  *****************************************************************************/
  58 static int Activate( vlc_object_t *p_this )
  59 {
  60     vout_thread_t *p_vout = (vout_thread_t *)p_this;
  61
  62     if( p_vout->render.i_width & 1 || p_vout->render.i_height & 1 )
  63     {
  64         return -1;
  65     }
  66
  67     switch( p_vout->render.i_chroma )
  68     {
  69         case VLC_FOURCC('G','R','E','Y'):
  70             switch( p_vout->output.i_chroma )
  71             {
  72                 case VLC_FOURCC('I','4','2','0'):
  73                     p_vout->chroma.pf_convert = GREY_I420;
  74                     break;
  75                 case VLC_FOURCC('Y','U','Y','2'):
  76                     p_vout->chroma.pf_convert = GREY_YUY2;
  77                     break;
  78                 default:
  79                     return -1;
  80             }
  81             break;
  82
  83         default:
  84             return -1;
  85     }
  86
  87     return 0;
  88 }
  89
  90 /* Following functions are local */
  91
  92 /*****************************************************************************
  93  * GREY_I420: 8-bit grayscale to planar YUV 4:2:0
  94  *****************************************************************************/
  95 static void GREY_I420( vout_thread_t *p_vout, picture_t *p_source,
  96                                               picture_t *p_dest )
  97 {
  98     uint8_t *p_line = p_source->p->p_pixels;
  99     uint8_t *p_y = p_dest->Y_PIXELS;
 100     uint8_t *p_u = p_dest->U_PIXELS;
 101     uint8_t *p_v = p_dest->V_PIXELS;
 102
 103     int i_x, i_y;
 104
 105     const int i_source_margin = p_source->p->i_pitch
 106                                  - p_source->p->i_visible_pitch;
 107     const int i_dest_margin = p_dest->p[0].i_pitch
 108                                - p_dest->p[0].i_visible_pitch;
 109     const int i_dest_margin_c = p_dest->p[1].i_pitch
 110                                  - p_dest->p[1].i_visible_pitch;
 111
 112     for( i_y = p_vout->render.i_height / 2; i_y-- ; )
 113     {
 114         memset(p_u, 0x80, p_dest->p[1].i_visible_pitch);
 115         p_u += i_dest_margin_c;
 116
 117         memset(p_v, 0x80, p_dest->p[1].i_visible_pitch);
 118         p_v += i_dest_margin_c;
 119     }
 120
 121     for( i_y = p_vout->render.i_height; i_y-- ; )
 122     {
 123         for( i_x = p_vout->render.i_width / 8; i_x-- ; )
 124         {
 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             *p_y++ = *p_line++; *p_y++ = *p_line++;
 129         }
 130
 131         for( i_x = p_vout->render.i_width % 8; i_x-- ; )
 132         {
 133             *p_y++ = *p_line++;
 134         }
 135
 136         p_line += i_source_margin;
 137         p_y += i_dest_margin;
 138     }
 139 }
 140
 141 /*****************************************************************************
 142  * GREY_YUY2: 8-bit grayscale to packed YUY2
 143  *****************************************************************************/
 144 static void GREY_YUY2( vout_thread_t *p_vout, picture_t *p_source,
 145                                               picture_t *p_dest )
 146 {
 147     uint8_t *p_in = p_source->p->p_pixels;
 148     uint8_t *p_out = p_dest->p->p_pixels;
 149
 150     int i_x, i_y;
 151
 152     const int i_source_margin = p_source->p->i_pitch
 153                                  - p_source->p->i_visible_pitch;
 154     const int i_dest_margin = p_dest->p->i_pitch
 155                                - p_dest->p->i_visible_pitch;
 156
 157     for( i_y = p_vout->render.i_height; i_y-- ; )
 158     {
 159         for( i_x = p_vout->render.i_width / 8; i_x-- ; )
 160         {
 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             *p_out++ = *p_in++; *p_out++ = 0x80;
 169         }
 170
 171         for( i_x = (p_vout->render.i_width % 8) / 2; i_x-- ; )
 172         {
 173             *p_out++ = *p_in++; *p_out++ = 0x80;
 174             *p_out++ = *p_in++; *p_out++ = 0x80;
 175         }
 176
 177         p_in += i_source_margin;
 178         p_out += i_dest_margin;
 179     }
 180 }
 181