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_vout.h>
  35
  36 #define SRC_FOURCC  "I422,J422"
  37 #define DEST_FOURCC "I420,IYUV,J420,YV12,YUVA"
  38
  39 /*****************************************************************************
  40  * Local and extern prototypes.
  41  *****************************************************************************/
  42 static int  Activate ( vlc_object_t * );
  43
  44 static void I422_I420( vout_thread_t *, picture_t *, picture_t * );
  45 static void I422_YV12( vout_thread_t *, picture_t *, picture_t * );
  46 static void I422_YUVA( vout_thread_t *, picture_t *, picture_t * );
  47
  48 /*****************************************************************************
  49  * Module descriptor
  50  *****************************************************************************/
  51 vlc_module_begin();
  52     set_description( _("Conversions from " SRC_FOURCC " to " DEST_FOURCC) );
  53     set_capability( "chroma", 60 );
  54     set_callbacks( Activate, NULL );
  55 vlc_module_end();
  56
  57 /*****************************************************************************
  58  * Activate: allocate a chroma function
  59  *****************************************************************************
  60  * This function allocates and initializes a chroma function
  61  *****************************************************************************/
  62 static int Activate( vlc_object_t *p_this )
  63 {
  64     vout_thread_t *p_vout = (vout_thread_t *)p_this;
  65
  66     if( p_vout->render.i_width & 1 || p_vout->render.i_height & 1 )
  67     {
  68         return -1;
  69     }
  70
  71     switch( p_vout->render.i_chroma )
  72     {
  73         case VLC_FOURCC('I','4','2','2'):
  74         case VLC_FOURCC('J','4','2','2'):
  75             switch( p_vout->output.i_chroma )
  76             {
  77                 case VLC_FOURCC('I','4','2','0'):
  78                 case VLC_FOURCC('I','Y','U','V'):
  79                 case VLC_FOURCC('J','4','2','0'):
  80                     p_vout->chroma.pf_convert = I422_I420;
  81                     break;
  82
  83                 case VLC_FOURCC('Y','V','1','2'):
  84                     p_vout->chroma.pf_convert = I422_YV12;
  85                     break;
  86
  87                 case VLC_FOURCC('Y','U','V','A'):
  88                     p_vout->chroma.pf_convert = I422_YUVA;
  89                     break;
  90
  91                 default:
  92                     return -1;
  93             }
  94             break;
  95
  96         default:
  97             return -1;
  98     }
  99     return 0;
 100 }
 101
 102 /* Following functions are local */
 103
 104 /*****************************************************************************
 105  * I422_I420: planar YUV 4:2:2 to planar I420 4:2:0 Y:U:V
 106  *****************************************************************************/
 107 static void I422_I420( vout_thread_t *p_vout, picture_t *p_source,
 108                                               picture_t *p_dest )
 109 {
 110     uint16_t i_dpy = p_dest->p[Y_PLANE].i_pitch;
 111     uint16_t i_spy = p_source->p[Y_PLANE].i_pitch;
 112     uint16_t i_dpuv = p_dest->p[U_PLANE].i_pitch;
 113     uint16_t i_spuv = p_source->p[U_PLANE].i_pitch;
 114     uint16_t i_width = p_vout->render.i_width;
 115     uint16_t i_y = p_vout->render.i_height;
 116     uint8_t *p_dy = p_dest->Y_PIXELS + (i_y-1)*i_dpy;
 117     uint8_t *p_y = p_source->Y_PIXELS + (i_y-1)*i_spy;
 118     uint8_t *p_du = p_dest->U_PIXELS + (i_y/2-1)*i_dpuv;
 119     uint8_t *p_u = p_source->U_PIXELS + (i_y-1)*i_spuv;
 120     uint8_t *p_dv = p_dest->V_PIXELS + (i_y/2-1)*i_dpuv;
 121     uint8_t *p_v = p_source->V_PIXELS + (i_y-1)*i_spuv;
 122     i_y /= 2;
 123
 124     for ( ; i_y--; )
 125     {
 126         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 127         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 128         vlc_memcpy(p_du, p_u, i_width/2); p_du -= i_dpuv; p_u -= 2*i_spuv;
 129         vlc_memcpy(p_dv, p_v, i_width/2); p_dv -= i_dpuv; p_v -= 2*i_spuv;
 130     }
 131 }
 132
 133 /*****************************************************************************
 134  * I422_YV12: planar YUV 4:2:2 to planar YV12 4:2:0 Y:V:U
 135  *****************************************************************************/
 136 static void I422_YV12( vout_thread_t *p_vout, picture_t *p_source,
 137                                               picture_t *p_dest )
 138 {
 139     uint16_t i_dpy = p_dest->p[Y_PLANE].i_pitch;
 140     uint16_t i_spy = p_source->p[Y_PLANE].i_pitch;
 141     uint16_t i_dpuv = p_dest->p[U_PLANE].i_pitch;
 142     uint16_t i_spuv = p_source->p[U_PLANE].i_pitch;
 143     uint16_t i_width = p_vout->render.i_width;
 144     uint16_t i_y = p_vout->render.i_height;
 145     uint8_t *p_dy = p_dest->Y_PIXELS + (i_y-1)*i_dpy;
 146     uint8_t *p_y = p_source->Y_PIXELS + (i_y-1)*i_spy;
 147     uint8_t *p_du = p_dest->V_PIXELS + (i_y/2-1)*i_dpuv; /* U and V are swapped */
 148     uint8_t *p_u = p_source->U_PIXELS + (i_y-1)*i_spuv;
 149     uint8_t *p_dv = p_dest->U_PIXELS + (i_y/2-1)*i_dpuv; /* U and V are swapped */
 150     uint8_t *p_v = p_source->V_PIXELS + (i_y-1)*i_spuv;
 151     i_y /= 2;
 152
 153     for ( ; i_y--; )
 154     {
 155         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 156         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 157         vlc_memcpy(p_du, p_u, i_width/2); p_du -= i_dpuv; p_u -= 2*i_spuv;
 158         vlc_memcpy(p_dv, p_v, i_width/2); p_dv -= i_dpuv; p_v -= 2*i_spuv;
 159     }
 160 }
 161
 162 /*****************************************************************************
 163  * I422_YUVA: planar YUV 4:2:2 to planar YUVA 4:2:0:4 Y:U:V:A
 164  *****************************************************************************/
 165 static void I422_YUVA( vout_thread_t *p_vout, picture_t *p_source,
 166                                               picture_t *p_dest )
 167 {
 168     I422_I420( p_vout, p_source, p_dest );
 169     vlc_memset( p_dest->p[A_PLANE].p_pixels, 0xff,
 170                 p_dest->p[A_PLANE].i_lines * p_dest->p[A_PLANE].i_pitch );
 171 }