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
  37 #define SRC_FOURCC  "I422,J422"
  38 #define DEST_FOURCC "I420,IYUV,J420,YV12,YUVA"
  39
  40 /*****************************************************************************
  41  * Local and extern prototypes.
  42  *****************************************************************************/
  43 static int  Activate ( vlc_object_t * );
  44
  45 static void I422_I420( filter_t *, picture_t *, picture_t * );
  46 static void I422_YV12( filter_t *, picture_t *, picture_t * );
  47 static void I422_YUVA( filter_t *, picture_t *, picture_t * );
  48 static picture_t *I422_I420_Filter( filter_t *, picture_t * );
  49 static picture_t *I422_YV12_Filter( filter_t *, picture_t * );
  50 static picture_t *I422_YUVA_Filter( filter_t *, picture_t * );
  51
  52 /*****************************************************************************
  53  * Module descriptor
  54  *****************************************************************************/
  55 vlc_module_begin ()
  56     set_description( N_("Conversions from " SRC_FOURCC " to " DEST_FOURCC) )
  57     set_capability( "video filter2", 60 )
  58     set_callbacks( Activate, NULL )
  59 vlc_module_end ()
  60
  61 /*****************************************************************************
  62  * Activate: allocate a chroma function
  63  *****************************************************************************
  64  * This function allocates and initializes a chroma function
  65  *****************************************************************************/
  66 static int Activate( vlc_object_t *p_this )
  67 {
  68     filter_t *p_filter = (filter_t *)p_this;
  69
  70     if( p_filter->fmt_in.video.i_width & 1
  71      || p_filter->fmt_in.video.i_height & 1 )
  72     {
  73         return -1;
  74     }
  75
  76     if( p_filter->fmt_in.video.i_width != p_filter->fmt_out.video.i_width
  77      || p_filter->fmt_in.video.i_height != p_filter->fmt_out.video.i_height )
  78         return -1;
  79
  80     switch( p_filter->fmt_in.video.i_chroma )
  81     {
  82         case VLC_CODEC_I422:
  83         case VLC_CODEC_J422:
  84             switch( p_filter->fmt_out.video.i_chroma )
  85             {
  86                 case VLC_CODEC_I420:
  87                 case VLC_CODEC_J420:
  88                     p_filter->pf_video_filter = I422_I420_Filter;
  89                     break;
  90
  91                 case VLC_CODEC_YV12:
  92                     p_filter->pf_video_filter = I422_YV12_Filter;
  93                     break;
  94
  95                 case VLC_CODEC_YUVA:
  96                     p_filter->pf_video_filter = I422_YUVA_Filter;
  97                     break;
  98
  99                 default:
 100                     return -1;
 101             }
 102             break;
 103
 104         default:
 105             return -1;
 106     }
 107     return 0;
 108 }
 109
 110 /* Following functions are local */
 111 VIDEO_FILTER_WRAPPER( I422_I420 )
 112 VIDEO_FILTER_WRAPPER( I422_YV12 )
 113 VIDEO_FILTER_WRAPPER( I422_YUVA )
 114
 115 /*****************************************************************************
 116  * I422_I420: planar YUV 4:2:2 to planar I420 4:2:0 Y:U:V
 117  *****************************************************************************/
 118 static void I422_I420( filter_t *p_filter, picture_t *p_source,
 119                                            picture_t *p_dest )
 120 {
 121     uint16_t i_dpy = p_dest->p[Y_PLANE].i_pitch;
 122     uint16_t i_spy = p_source->p[Y_PLANE].i_pitch;
 123     uint16_t i_dpuv = p_dest->p[U_PLANE].i_pitch;
 124     uint16_t i_spuv = p_source->p[U_PLANE].i_pitch;
 125     uint16_t i_width = p_filter->fmt_in.video.i_width;
 126     uint16_t i_y = p_filter->fmt_in.video.i_height;
 127     uint8_t *p_dy = p_dest->Y_PIXELS + (i_y-1)*i_dpy;
 128     uint8_t *p_y = p_source->Y_PIXELS + (i_y-1)*i_spy;
 129     uint8_t *p_du = p_dest->U_PIXELS + (i_y/2-1)*i_dpuv;
 130     uint8_t *p_u = p_source->U_PIXELS + (i_y-1)*i_spuv;
 131     uint8_t *p_dv = p_dest->V_PIXELS + (i_y/2-1)*i_dpuv;
 132     uint8_t *p_v = p_source->V_PIXELS + (i_y-1)*i_spuv;
 133     i_y /= 2;
 134
 135     for ( ; i_y--; )
 136     {
 137         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 138         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 139         vlc_memcpy(p_du, p_u, i_width/2); p_du -= i_dpuv; p_u -= 2*i_spuv;
 140         vlc_memcpy(p_dv, p_v, i_width/2); p_dv -= i_dpuv; p_v -= 2*i_spuv;
 141     }
 142 }
 143
 144 /*****************************************************************************
 145  * I422_YV12: planar YUV 4:2:2 to planar YV12 4:2:0 Y:V:U
 146  *****************************************************************************/
 147 static void I422_YV12( filter_t *p_filter, picture_t *p_source,
 148                                            picture_t *p_dest )
 149 {
 150     uint16_t i_dpy = p_dest->p[Y_PLANE].i_pitch;
 151     uint16_t i_spy = p_source->p[Y_PLANE].i_pitch;
 152     uint16_t i_dpuv = p_dest->p[U_PLANE].i_pitch;
 153     uint16_t i_spuv = p_source->p[U_PLANE].i_pitch;
 154     uint16_t i_width = p_filter->fmt_in.video.i_width;
 155     uint16_t i_y = p_filter->fmt_in.video.i_height;
 156     uint8_t *p_dy = p_dest->Y_PIXELS + (i_y-1)*i_dpy;
 157     uint8_t *p_y = p_source->Y_PIXELS + (i_y-1)*i_spy;
 158     uint8_t *p_du = p_dest->V_PIXELS + (i_y/2-1)*i_dpuv; /* U and V are swapped */
 159     uint8_t *p_u = p_source->U_PIXELS + (i_y-1)*i_spuv;
 160     uint8_t *p_dv = p_dest->U_PIXELS + (i_y/2-1)*i_dpuv; /* U and V are swapped */
 161     uint8_t *p_v = p_source->V_PIXELS + (i_y-1)*i_spuv;
 162     i_y /= 2;
 163
 164     for ( ; i_y--; )
 165     {
 166         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 167         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 168         vlc_memcpy(p_du, p_u, i_width/2); p_du -= i_dpuv; p_u -= 2*i_spuv;
 169         vlc_memcpy(p_dv, p_v, i_width/2); p_dv -= i_dpuv; p_v -= 2*i_spuv;
 170     }
 171 }
 172
 173 /*****************************************************************************
 174  * I422_YUVA: planar YUV 4:2:2 to planar YUVA 4:2:0:4 Y:U:V:A
 175  *****************************************************************************/
 176 static void I422_YUVA( filter_t *p_filter, picture_t *p_source,
 177                                            picture_t *p_dest )
 178 {
 179     I422_I420( p_filter, p_source, p_dest );
 180     vlc_memset( p_dest->p[A_PLANE].p_pixels, 0xff,
 181                 p_dest->p[A_PLANE].i_lines * p_dest->p[A_PLANE].i_pitch );
 182 }