git.sesse.net Git - vlc/blob - modules/video_chroma/i422_i420.c

   1 /*****************************************************************************
   2  * i422_i420.c : Planar YUV 4:2:2 to Planar YUV 4:2:0 conversion module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2000, 2001 - 2007 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.org>
   8  *          Damien Fouilleul <damienf@videolan.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <vlc_common.h>
  34 #include <vlc_plugin.h>
  35 #include <vlc_filter.h>
  36 #include <vlc_vout.h>
  37
  38 #define SRC_FOURCC  "I422,J422"
  39 #define DEST_FOURCC "I420,IYUV,J420,YV12,YUVA"
  40
  41 /*****************************************************************************
  42  * Local and extern prototypes.
  43  *****************************************************************************/
  44 static int  Activate ( vlc_object_t * );
  45
  46 static void I422_I420( filter_t *, picture_t *, picture_t * );
  47 static void I422_YV12( filter_t *, picture_t *, picture_t * );
  48 static void I422_YUVA( filter_t *, picture_t *, picture_t * );
  49 static picture_t *I422_I420_Filter( filter_t *, picture_t * );
  50 static picture_t *I422_YV12_Filter( filter_t *, picture_t * );
  51 static picture_t *I422_YUVA_Filter( filter_t *, picture_t * );
  52
  53 /*****************************************************************************
  54  * Module descriptor
  55  *****************************************************************************/
  56 vlc_module_begin();
  57     set_description( N_("Conversions from " SRC_FOURCC " to " DEST_FOURCC) );
  58     set_capability( "video filter2", 60 );
  59     set_callbacks( Activate, NULL );
  60 vlc_module_end();
  61
  62 /*****************************************************************************
  63  * Activate: allocate a chroma function
  64  *****************************************************************************
  65  * This function allocates and initializes a chroma function
  66  *****************************************************************************/
  67 static int Activate( vlc_object_t *p_this )
  68 {
  69     filter_t *p_filter = (filter_t *)p_this;
  70
  71     if( p_filter->fmt_in.video.i_width & 1
  72      || p_filter->fmt_in.video.i_height & 1 )
  73     {
  74         return -1;
  75     }
  76
  77     switch( p_filter->fmt_in.video.i_chroma )
  78     {
  79         case VLC_FOURCC('I','4','2','2'):
  80         case VLC_FOURCC('J','4','2','2'):
  81             switch( p_filter->fmt_out.video.i_chroma )
  82             {
  83                 case VLC_FOURCC('I','4','2','0'):
  84                 case VLC_FOURCC('I','Y','U','V'):
  85                 case VLC_FOURCC('J','4','2','0'):
  86                     p_filter->pf_video_filter = I422_I420_Filter;
  87                     break;
  88
  89                 case VLC_FOURCC('Y','V','1','2'):
  90                     p_filter->pf_video_filter = I422_YV12_Filter;
  91                     break;
  92
  93                 case VLC_FOURCC('Y','U','V','A'):
  94                     p_filter->pf_video_filter = I422_YUVA_Filter;
  95                     break;
  96
  97                 default:
  98                     return -1;
  99             }
 100             break;
 101
 102         default:
 103             return -1;
 104     }
 105     return 0;
 106 }
 107
 108 /* Following functions are local */
 109 VIDEO_FILTER_WRAPPER( I422_I420 )
 110 VIDEO_FILTER_WRAPPER( I422_YV12 )
 111 VIDEO_FILTER_WRAPPER( I422_YUVA )
 112
 113 /*****************************************************************************
 114  * I422_I420: planar YUV 4:2:2 to planar I420 4:2:0 Y:U:V
 115  *****************************************************************************/
 116 static void I422_I420( filter_t *p_filter, picture_t *p_source,
 117                                            picture_t *p_dest )
 118 {
 119     uint16_t i_dpy = p_dest->p[Y_PLANE].i_pitch;
 120     uint16_t i_spy = p_source->p[Y_PLANE].i_pitch;
 121     uint16_t i_dpuv = p_dest->p[U_PLANE].i_pitch;
 122     uint16_t i_spuv = p_source->p[U_PLANE].i_pitch;
 123     uint16_t i_width = p_filter->fmt_in.video.i_width;
 124     uint16_t i_y = p_filter->fmt_in.video.i_height;
 125     uint8_t *p_dy = p_dest->Y_PIXELS + (i_y-1)*i_dpy;
 126     uint8_t *p_y = p_source->Y_PIXELS + (i_y-1)*i_spy;
 127     uint8_t *p_du = p_dest->U_PIXELS + (i_y/2-1)*i_dpuv;
 128     uint8_t *p_u = p_source->U_PIXELS + (i_y-1)*i_spuv;
 129     uint8_t *p_dv = p_dest->V_PIXELS + (i_y/2-1)*i_dpuv;
 130     uint8_t *p_v = p_source->V_PIXELS + (i_y-1)*i_spuv;
 131     i_y /= 2;
 132
 133     for ( ; i_y--; )
 134     {
 135         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 136         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 137         vlc_memcpy(p_du, p_u, i_width/2); p_du -= i_dpuv; p_u -= 2*i_spuv;
 138         vlc_memcpy(p_dv, p_v, i_width/2); p_dv -= i_dpuv; p_v -= 2*i_spuv;
 139     }
 140 }
 141
 142 /*****************************************************************************
 143  * I422_YV12: planar YUV 4:2:2 to planar YV12 4:2:0 Y:V:U
 144  *****************************************************************************/
 145 static void I422_YV12( filter_t *p_filter, picture_t *p_source,
 146                                            picture_t *p_dest )
 147 {
 148     uint16_t i_dpy = p_dest->p[Y_PLANE].i_pitch;
 149     uint16_t i_spy = p_source->p[Y_PLANE].i_pitch;
 150     uint16_t i_dpuv = p_dest->p[U_PLANE].i_pitch;
 151     uint16_t i_spuv = p_source->p[U_PLANE].i_pitch;
 152     uint16_t i_width = p_filter->fmt_in.video.i_width;
 153     uint16_t i_y = p_filter->fmt_in.video.i_height;
 154     uint8_t *p_dy = p_dest->Y_PIXELS + (i_y-1)*i_dpy;
 155     uint8_t *p_y = p_source->Y_PIXELS + (i_y-1)*i_spy;
 156     uint8_t *p_du = p_dest->V_PIXELS + (i_y/2-1)*i_dpuv; /* U and V are swapped */
 157     uint8_t *p_u = p_source->U_PIXELS + (i_y-1)*i_spuv;
 158     uint8_t *p_dv = p_dest->U_PIXELS + (i_y/2-1)*i_dpuv; /* U and V are swapped */
 159     uint8_t *p_v = p_source->V_PIXELS + (i_y-1)*i_spuv;
 160     i_y /= 2;
 161
 162     for ( ; i_y--; )
 163     {
 164         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 165         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 166         vlc_memcpy(p_du, p_u, i_width/2); p_du -= i_dpuv; p_u -= 2*i_spuv;
 167         vlc_memcpy(p_dv, p_v, i_width/2); p_dv -= i_dpuv; p_v -= 2*i_spuv;
 168     }
 169 }
 170
 171 /*****************************************************************************
 172  * I422_YUVA: planar YUV 4:2:2 to planar YUVA 4:2:0:4 Y:U:V:A
 173  *****************************************************************************/
 174 static void I422_YUVA( filter_t *p_filter, picture_t *p_source,
 175                                            picture_t *p_dest )
 176 {
 177     I422_I420( p_filter, p_source, p_dest );
 178     vlc_memset( p_dest->p[A_PLANE].p_pixels, 0xff,
 179                 p_dest->p[A_PLANE].i_lines * p_dest->p[A_PLANE].i_pitch );
 180 }