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 VLC authors and VideoLAN
   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 it
  11  * under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with this program; if not, write to the Free Software Foundation,
  22  * 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_picture.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 converter", 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     if( p_filter->fmt_in.video.i_width != p_filter->fmt_out.video.i_width
  78        || p_filter->fmt_in.video.i_height != p_filter->fmt_out.video.i_height
  79        || p_filter->fmt_in.video.orientation != p_filter->fmt_out.video.orientation )
  80         return -1;
  81
  82     switch( p_filter->fmt_in.video.i_chroma )
  83     {
  84         case VLC_CODEC_I422:
  85         case VLC_CODEC_J422:
  86             switch( p_filter->fmt_out.video.i_chroma )
  87             {
  88                 case VLC_CODEC_I420:
  89                 case VLC_CODEC_J420:
  90                     p_filter->pf_video_filter = I422_I420_Filter;
  91                     break;
  92
  93                 case VLC_CODEC_YV12:
  94                     p_filter->pf_video_filter = I422_YV12_Filter;
  95                     break;
  96
  97                 case VLC_CODEC_YUV420A:
  98                     p_filter->pf_video_filter = I422_YUVA_Filter;
  99                     break;
 100
 101                 default:
 102                     return -1;
 103             }
 104             break;
 105
 106         default:
 107             return -1;
 108     }
 109     return 0;
 110 }
 111
 112 /* Following functions are local */
 113 VIDEO_FILTER_WRAPPER( I422_I420 )
 114 VIDEO_FILTER_WRAPPER( I422_YV12 )
 115 VIDEO_FILTER_WRAPPER( I422_YUVA )
 116
 117 /*****************************************************************************
 118  * I422_I420: planar YUV 4:2:2 to planar I420 4:2:0 Y:U:V
 119  *****************************************************************************/
 120 static void I422_I420( filter_t *p_filter, picture_t *p_source,
 121                                            picture_t *p_dest )
 122 {
 123     uint16_t i_dpy = p_dest->p[Y_PLANE].i_pitch;
 124     uint16_t i_spy = p_source->p[Y_PLANE].i_pitch;
 125     uint16_t i_dpuv = p_dest->p[U_PLANE].i_pitch;
 126     uint16_t i_spuv = p_source->p[U_PLANE].i_pitch;
 127     uint16_t i_width = p_filter->fmt_in.video.i_width;
 128     uint16_t i_y = p_filter->fmt_in.video.i_height;
 129     uint8_t *p_dy = p_dest->Y_PIXELS + (i_y-1)*i_dpy;
 130     uint8_t *p_y = p_source->Y_PIXELS + (i_y-1)*i_spy;
 131     uint8_t *p_du = p_dest->U_PIXELS + (i_y/2-1)*i_dpuv;
 132     uint8_t *p_u = p_source->U_PIXELS + (i_y-1)*i_spuv;
 133     uint8_t *p_dv = p_dest->V_PIXELS + (i_y/2-1)*i_dpuv;
 134     uint8_t *p_v = p_source->V_PIXELS + (i_y-1)*i_spuv;
 135     i_y /= 2;
 136
 137     for ( ; i_y--; )
 138     {
 139         memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 140         memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 141         memcpy(p_du, p_u, i_width/2); p_du -= i_dpuv; p_u -= 2*i_spuv;
 142         memcpy(p_dv, p_v, i_width/2); p_dv -= i_dpuv; p_v -= 2*i_spuv;
 143     }
 144 }
 145
 146 /*****************************************************************************
 147  * I422_YV12: planar YUV 4:2:2 to planar YV12 4:2:0 Y:V:U
 148  *****************************************************************************/
 149 static void I422_YV12( filter_t *p_filter, picture_t *p_source,
 150                                            picture_t *p_dest )
 151 {
 152     uint16_t i_dpy = p_dest->p[Y_PLANE].i_pitch;
 153     uint16_t i_spy = p_source->p[Y_PLANE].i_pitch;
 154     uint16_t i_dpuv = p_dest->p[U_PLANE].i_pitch;
 155     uint16_t i_spuv = p_source->p[U_PLANE].i_pitch;
 156     uint16_t i_width = p_filter->fmt_in.video.i_width;
 157     uint16_t i_y = p_filter->fmt_in.video.i_height;
 158     uint8_t *p_dy = p_dest->Y_PIXELS + (i_y-1)*i_dpy;
 159     uint8_t *p_y = p_source->Y_PIXELS + (i_y-1)*i_spy;
 160     uint8_t *p_du = p_dest->V_PIXELS + (i_y/2-1)*i_dpuv; /* U and V are swapped */
 161     uint8_t *p_u = p_source->U_PIXELS + (i_y-1)*i_spuv;
 162     uint8_t *p_dv = p_dest->U_PIXELS + (i_y/2-1)*i_dpuv; /* U and V are swapped */
 163     uint8_t *p_v = p_source->V_PIXELS + (i_y-1)*i_spuv;
 164     i_y /= 2;
 165
 166     for ( ; i_y--; )
 167     {
 168         memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 169         memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 170         memcpy(p_du, p_u, i_width/2); p_du -= i_dpuv; p_u -= 2*i_spuv;
 171         memcpy(p_dv, p_v, i_width/2); p_dv -= i_dpuv; p_v -= 2*i_spuv;
 172     }
 173 }
 174
 175 /*****************************************************************************
 176  * I422_YUVA: planar YUV 4:2:2 to planar YUVA 4:2:0:4 Y:U:V:A
 177  *****************************************************************************/
 178 static void I422_YUVA( filter_t *p_filter, picture_t *p_source,
 179                                            picture_t *p_dest )
 180 {
 181     I422_I420( p_filter, p_source, p_dest );
 182     memset( p_dest->p[A_PLANE].p_pixels, 0xff,
 183                 p_dest->p[A_PLANE].i_lines * p_dest->p[A_PLANE].i_pitch );
 184 }