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
  50 /*****************************************************************************
  51  * Module descriptor
  52  *****************************************************************************/
  53 vlc_module_begin();
  54     set_description( N_("Conversions from " SRC_FOURCC " to " DEST_FOURCC) );
  55     set_capability( "chroma", 60 );
  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_in.video.i_width & 1
  69      || p_filter->fmt_in.video.i_height & 1 )
  70     {
  71         return -1;
  72     }
  73
  74     switch( p_filter->fmt_in.video.i_chroma )
  75     {
  76         case VLC_FOURCC('I','4','2','2'):
  77         case VLC_FOURCC('J','4','2','2'):
  78             switch( p_filter->fmt_out.video.i_chroma )
  79             {
  80                 case VLC_FOURCC('I','4','2','0'):
  81                 case VLC_FOURCC('I','Y','U','V'):
  82                 case VLC_FOURCC('J','4','2','0'):
  83                     p_filter->pf_video_filter_io = I422_I420;
  84                     break;
  85
  86                 case VLC_FOURCC('Y','V','1','2'):
  87                     p_filter->pf_video_filter_io = I422_YV12;
  88                     break;
  89
  90                 case VLC_FOURCC('Y','U','V','A'):
  91                     p_filter->pf_video_filter_io = I422_YUVA;
  92                     break;
  93
  94                 default:
  95                     return -1;
  96             }
  97             break;
  98
  99         default:
 100             return -1;
 101     }
 102     return 0;
 103 }
 104
 105 /* Following functions are local */
 106
 107 /*****************************************************************************
 108  * I422_I420: planar YUV 4:2:2 to planar I420 4:2:0 Y:U:V
 109  *****************************************************************************/
 110 static void I422_I420( filter_t *p_filter, picture_t *p_source,
 111                                            picture_t *p_dest )
 112 {
 113     uint16_t i_dpy = p_dest->p[Y_PLANE].i_pitch;
 114     uint16_t i_spy = p_source->p[Y_PLANE].i_pitch;
 115     uint16_t i_dpuv = p_dest->p[U_PLANE].i_pitch;
 116     uint16_t i_spuv = p_source->p[U_PLANE].i_pitch;
 117     uint16_t i_width = p_filter->fmt_in.video.i_width;
 118     uint16_t i_y = p_filter->fmt_in.video.i_height;
 119     uint8_t *p_dy = p_dest->Y_PIXELS + (i_y-1)*i_dpy;
 120     uint8_t *p_y = p_source->Y_PIXELS + (i_y-1)*i_spy;
 121     uint8_t *p_du = p_dest->U_PIXELS + (i_y/2-1)*i_dpuv;
 122     uint8_t *p_u = p_source->U_PIXELS + (i_y-1)*i_spuv;
 123     uint8_t *p_dv = p_dest->V_PIXELS + (i_y/2-1)*i_dpuv;
 124     uint8_t *p_v = p_source->V_PIXELS + (i_y-1)*i_spuv;
 125     i_y /= 2;
 126
 127     for ( ; i_y--; )
 128     {
 129         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 130         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 131         vlc_memcpy(p_du, p_u, i_width/2); p_du -= i_dpuv; p_u -= 2*i_spuv;
 132         vlc_memcpy(p_dv, p_v, i_width/2); p_dv -= i_dpuv; p_v -= 2*i_spuv;
 133     }
 134 }
 135
 136 /*****************************************************************************
 137  * I422_YV12: planar YUV 4:2:2 to planar YV12 4:2:0 Y:V:U
 138  *****************************************************************************/
 139 static void I422_YV12( filter_t *p_filter, picture_t *p_source,
 140                                            picture_t *p_dest )
 141 {
 142     uint16_t i_dpy = p_dest->p[Y_PLANE].i_pitch;
 143     uint16_t i_spy = p_source->p[Y_PLANE].i_pitch;
 144     uint16_t i_dpuv = p_dest->p[U_PLANE].i_pitch;
 145     uint16_t i_spuv = p_source->p[U_PLANE].i_pitch;
 146     uint16_t i_width = p_filter->fmt_in.video.i_width;
 147     uint16_t i_y = p_filter->fmt_in.video.i_height;
 148     uint8_t *p_dy = p_dest->Y_PIXELS + (i_y-1)*i_dpy;
 149     uint8_t *p_y = p_source->Y_PIXELS + (i_y-1)*i_spy;
 150     uint8_t *p_du = p_dest->V_PIXELS + (i_y/2-1)*i_dpuv; /* U and V are swapped */
 151     uint8_t *p_u = p_source->U_PIXELS + (i_y-1)*i_spuv;
 152     uint8_t *p_dv = p_dest->U_PIXELS + (i_y/2-1)*i_dpuv; /* U and V are swapped */
 153     uint8_t *p_v = p_source->V_PIXELS + (i_y-1)*i_spuv;
 154     i_y /= 2;
 155
 156     for ( ; i_y--; )
 157     {
 158         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 159         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 160         vlc_memcpy(p_du, p_u, i_width/2); p_du -= i_dpuv; p_u -= 2*i_spuv;
 161         vlc_memcpy(p_dv, p_v, i_width/2); p_dv -= i_dpuv; p_v -= 2*i_spuv;
 162     }
 163 }
 164
 165 /*****************************************************************************
 166  * I422_YUVA: planar YUV 4:2:2 to planar YUVA 4:2:0:4 Y:U:V:A
 167  *****************************************************************************/
 168 static void I422_YUVA( filter_t *p_filter, picture_t *p_source,
 169                                            picture_t *p_dest )
 170 {
 171     I422_I420( p_filter, p_source, p_dest );
 172     vlc_memset( p_dest->p[A_PLANE].p_pixels, 0xff,
 173                 p_dest->p[A_PLANE].i_lines * p_dest->p[A_PLANE].i_pitch );
 174 }