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  *
   6  * Authors: Samuel Hocevar <sam@zoy.org>
   7  *          Damien Fouilleul <damienf@videolan.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_filter.h>
  35 #include <vlc_picture.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 converter", 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        || p_filter->fmt_in.video.orientation != p_filter->fmt_out.video.orientation )
  79         return -1;
  80
  81     switch( p_filter->fmt_in.video.i_chroma )
  82     {
  83         case VLC_CODEC_I422:
  84         case VLC_CODEC_J422:
  85             switch( p_filter->fmt_out.video.i_chroma )
  86             {
  87                 case VLC_CODEC_I420:
  88                 case VLC_CODEC_J420:
  89                     p_filter->pf_video_filter = I422_I420_Filter;
  90                     break;
  91
  92                 case VLC_CODEC_YV12:
  93                     p_filter->pf_video_filter = I422_YV12_Filter;
  94                     break;
  95
  96                 case VLC_CODEC_YUV420A:
  97                     p_filter->pf_video_filter = I422_YUVA_Filter;
  98                     break;
  99
 100                 default:
 101                     return -1;
 102             }
 103             break;
 104
 105         default:
 106             return -1;
 107     }
 108     return 0;
 109 }
 110
 111 /* Following functions are local */
 112 VIDEO_FILTER_WRAPPER( I422_I420 )
 113 VIDEO_FILTER_WRAPPER( I422_YV12 )
 114 VIDEO_FILTER_WRAPPER( I422_YUVA )
 115
 116 /*****************************************************************************
 117  * I422_I420: planar YUV 4:2:2 to planar I420 4:2:0 Y:U:V
 118  *****************************************************************************/
 119 static void I422_I420( filter_t *p_filter, picture_t *p_source,
 120                                            picture_t *p_dest )
 121 {
 122     uint16_t i_dpy = p_dest->p[Y_PLANE].i_pitch;
 123     uint16_t i_spy = p_source->p[Y_PLANE].i_pitch;
 124     uint16_t i_dpuv = p_dest->p[U_PLANE].i_pitch;
 125     uint16_t i_spuv = p_source->p[U_PLANE].i_pitch;
 126     uint16_t i_width = p_filter->fmt_in.video.i_width;
 127     uint16_t i_y = p_filter->fmt_in.video.i_height;
 128     uint8_t *p_dy = p_dest->Y_PIXELS + (i_y-1)*i_dpy;
 129     uint8_t *p_y = p_source->Y_PIXELS + (i_y-1)*i_spy;
 130     uint8_t *p_du = p_dest->U_PIXELS + (i_y/2-1)*i_dpuv;
 131     uint8_t *p_u = p_source->U_PIXELS + (i_y-1)*i_spuv;
 132     uint8_t *p_dv = p_dest->V_PIXELS + (i_y/2-1)*i_dpuv;
 133     uint8_t *p_v = p_source->V_PIXELS + (i_y-1)*i_spuv;
 134     i_y /= 2;
 135
 136     for ( ; i_y--; )
 137     {
 138         memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 139         memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 140         memcpy(p_du, p_u, i_width/2); p_du -= i_dpuv; p_u -= 2*i_spuv;
 141         memcpy(p_dv, p_v, i_width/2); p_dv -= i_dpuv; p_v -= 2*i_spuv;
 142     }
 143 }
 144
 145 /*****************************************************************************
 146  * I422_YV12: planar YUV 4:2:2 to planar YV12 4:2:0 Y:V:U
 147  *****************************************************************************/
 148 static void I422_YV12( filter_t *p_filter, picture_t *p_source,
 149                                            picture_t *p_dest )
 150 {
 151     uint16_t i_dpy = p_dest->p[Y_PLANE].i_pitch;
 152     uint16_t i_spy = p_source->p[Y_PLANE].i_pitch;
 153     uint16_t i_dpuv = p_dest->p[U_PLANE].i_pitch;
 154     uint16_t i_spuv = p_source->p[U_PLANE].i_pitch;
 155     uint16_t i_width = p_filter->fmt_in.video.i_width;
 156     uint16_t i_y = p_filter->fmt_in.video.i_height;
 157     uint8_t *p_dy = p_dest->Y_PIXELS + (i_y-1)*i_dpy;
 158     uint8_t *p_y = p_source->Y_PIXELS + (i_y-1)*i_spy;
 159     uint8_t *p_du = p_dest->V_PIXELS + (i_y/2-1)*i_dpuv; /* U and V are swapped */
 160     uint8_t *p_u = p_source->U_PIXELS + (i_y-1)*i_spuv;
 161     uint8_t *p_dv = p_dest->U_PIXELS + (i_y/2-1)*i_dpuv; /* U and V are swapped */
 162     uint8_t *p_v = p_source->V_PIXELS + (i_y-1)*i_spuv;
 163     i_y /= 2;
 164
 165     for ( ; i_y--; )
 166     {
 167         memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 168         memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 169         memcpy(p_du, p_u, i_width/2); p_du -= i_dpuv; p_u -= 2*i_spuv;
 170         memcpy(p_dv, p_v, i_width/2); p_dv -= i_dpuv; p_v -= 2*i_spuv;
 171     }
 172 }
 173
 174 /*****************************************************************************
 175  * I422_YUVA: planar YUV 4:2:2 to planar YUVA 4:2:0:4 Y:U:V:A
 176  *****************************************************************************/
 177 static void I422_YUVA( filter_t *p_filter, picture_t *p_source,
 178                                            picture_t *p_dest )
 179 {
 180     I422_I420( p_filter, p_source, p_dest );
 181     memset( p_dest->p[A_PLANE].p_pixels, 0xff,
 182                 p_dest->p[A_PLANE].i_lines * p_dest->p[A_PLANE].i_pitch );
 183 }