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/vlc.h>
  34 #include <vlc_plugin.h>
  35 #include <vlc_vout.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( vout_thread_t *, picture_t *, picture_t * );
  46 static void I422_YV12( vout_thread_t *, picture_t *, picture_t * );
  47 static void I422_YUVA( vout_thread_t *, picture_t *, picture_t * );
  48
  49 /*****************************************************************************
  50  * Module descriptor
  51  *****************************************************************************/
  52 vlc_module_begin();
  53     set_description( N_("Conversions from " SRC_FOURCC " to " DEST_FOURCC) );
  54     set_capability( "chroma", 60 );
  55     set_callbacks( Activate, NULL );
  56 vlc_module_end();
  57
  58 /*****************************************************************************
  59  * Activate: allocate a chroma function
  60  *****************************************************************************
  61  * This function allocates and initializes a chroma function
  62  *****************************************************************************/
  63 static int Activate( vlc_object_t *p_this )
  64 {
  65     vout_thread_t *p_vout = (vout_thread_t *)p_this;
  66
  67     if( p_vout->render.i_width & 1 || p_vout->render.i_height & 1 )
  68     {
  69         return -1;
  70     }
  71
  72     switch( p_vout->render.i_chroma )
  73     {
  74         case VLC_FOURCC('I','4','2','2'):
  75         case VLC_FOURCC('J','4','2','2'):
  76             switch( p_vout->output.i_chroma )
  77             {
  78                 case VLC_FOURCC('I','4','2','0'):
  79                 case VLC_FOURCC('I','Y','U','V'):
  80                 case VLC_FOURCC('J','4','2','0'):
  81                     p_vout->chroma.pf_convert = I422_I420;
  82                     break;
  83
  84                 case VLC_FOURCC('Y','V','1','2'):
  85                     p_vout->chroma.pf_convert = I422_YV12;
  86                     break;
  87
  88                 case VLC_FOURCC('Y','U','V','A'):
  89                     p_vout->chroma.pf_convert = I422_YUVA;
  90                     break;
  91
  92                 default:
  93                     return -1;
  94             }
  95             break;
  96
  97         default:
  98             return -1;
  99     }
 100     return 0;
 101 }
 102
 103 /* Following functions are local */
 104
 105 /*****************************************************************************
 106  * I422_I420: planar YUV 4:2:2 to planar I420 4:2:0 Y:U:V
 107  *****************************************************************************/
 108 static void I422_I420( vout_thread_t *p_vout, picture_t *p_source,
 109                                               picture_t *p_dest )
 110 {
 111     uint16_t i_dpy = p_dest->p[Y_PLANE].i_pitch;
 112     uint16_t i_spy = p_source->p[Y_PLANE].i_pitch;
 113     uint16_t i_dpuv = p_dest->p[U_PLANE].i_pitch;
 114     uint16_t i_spuv = p_source->p[U_PLANE].i_pitch;
 115     uint16_t i_width = p_vout->render.i_width;
 116     uint16_t i_y = p_vout->render.i_height;
 117     uint8_t *p_dy = p_dest->Y_PIXELS + (i_y-1)*i_dpy;
 118     uint8_t *p_y = p_source->Y_PIXELS + (i_y-1)*i_spy;
 119     uint8_t *p_du = p_dest->U_PIXELS + (i_y/2-1)*i_dpuv;
 120     uint8_t *p_u = p_source->U_PIXELS + (i_y-1)*i_spuv;
 121     uint8_t *p_dv = p_dest->V_PIXELS + (i_y/2-1)*i_dpuv;
 122     uint8_t *p_v = p_source->V_PIXELS + (i_y-1)*i_spuv;
 123     i_y /= 2;
 124
 125     for ( ; i_y--; )
 126     {
 127         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 128         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 129         vlc_memcpy(p_du, p_u, i_width/2); p_du -= i_dpuv; p_u -= 2*i_spuv;
 130         vlc_memcpy(p_dv, p_v, i_width/2); p_dv -= i_dpuv; p_v -= 2*i_spuv;
 131     }
 132 }
 133
 134 /*****************************************************************************
 135  * I422_YV12: planar YUV 4:2:2 to planar YV12 4:2:0 Y:V:U
 136  *****************************************************************************/
 137 static void I422_YV12( vout_thread_t *p_vout, picture_t *p_source,
 138                                               picture_t *p_dest )
 139 {
 140     uint16_t i_dpy = p_dest->p[Y_PLANE].i_pitch;
 141     uint16_t i_spy = p_source->p[Y_PLANE].i_pitch;
 142     uint16_t i_dpuv = p_dest->p[U_PLANE].i_pitch;
 143     uint16_t i_spuv = p_source->p[U_PLANE].i_pitch;
 144     uint16_t i_width = p_vout->render.i_width;
 145     uint16_t i_y = p_vout->render.i_height;
 146     uint8_t *p_dy = p_dest->Y_PIXELS + (i_y-1)*i_dpy;
 147     uint8_t *p_y = p_source->Y_PIXELS + (i_y-1)*i_spy;
 148     uint8_t *p_du = p_dest->V_PIXELS + (i_y/2-1)*i_dpuv; /* U and V are swapped */
 149     uint8_t *p_u = p_source->U_PIXELS + (i_y-1)*i_spuv;
 150     uint8_t *p_dv = p_dest->U_PIXELS + (i_y/2-1)*i_dpuv; /* U and V are swapped */
 151     uint8_t *p_v = p_source->V_PIXELS + (i_y-1)*i_spuv;
 152     i_y /= 2;
 153
 154     for ( ; i_y--; )
 155     {
 156         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 157         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 158         vlc_memcpy(p_du, p_u, i_width/2); p_du -= i_dpuv; p_u -= 2*i_spuv;
 159         vlc_memcpy(p_dv, p_v, i_width/2); p_dv -= i_dpuv; p_v -= 2*i_spuv;
 160     }
 161 }
 162
 163 /*****************************************************************************
 164  * I422_YUVA: planar YUV 4:2:2 to planar YUVA 4:2:0:4 Y:U:V:A
 165  *****************************************************************************/
 166 static void I422_YUVA( vout_thread_t *p_vout, picture_t *p_source,
 167                                               picture_t *p_dest )
 168 {
 169     I422_I420( p_vout, p_source, p_dest );
 170     vlc_memset( p_dest->p[A_PLANE].p_pixels, 0xff,
 171                 p_dest->p[A_PLANE].i_lines * p_dest->p[A_PLANE].i_pitch );
 172 }