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 #include <vlc/vlc.h>
  30 #include <vlc_vout.h>
  31
  32 #define SRC_FOURCC  "I422,J422"
  33 #define DEST_FOURCC "I420,IYUV,J420,YV12,YUVA"
  34
  35 /*****************************************************************************
  36  * Local and extern prototypes.
  37  *****************************************************************************/
  38 static int  Activate ( vlc_object_t * );
  39
  40 static void I422_I420( vout_thread_t *, picture_t *, picture_t * );
  41 static void I422_YV12( vout_thread_t *, picture_t *, picture_t * );
  42 static void I422_YUVA( vout_thread_t *, picture_t *, picture_t * );
  43
  44 /*****************************************************************************
  45  * Module descriptor
  46  *****************************************************************************/
  47 vlc_module_begin();
  48     set_description( _("Conversions from " SRC_FOURCC " to " DEST_FOURCC) );
  49     set_capability( "chroma", 60 );
  50     set_callbacks( Activate, NULL );
  51 vlc_module_end();
  52
  53 /*****************************************************************************
  54  * Activate: allocate a chroma function
  55  *****************************************************************************
  56  * This function allocates and initializes a chroma function
  57  *****************************************************************************/
  58 static int Activate( vlc_object_t *p_this )
  59 {
  60     vout_thread_t *p_vout = (vout_thread_t *)p_this;
  61
  62     if( p_vout->render.i_width & 1 || p_vout->render.i_height & 1 )
  63     {
  64         return -1;
  65     }
  66
  67     switch( p_vout->render.i_chroma )
  68     {
  69         case VLC_FOURCC('I','4','2','2'):
  70         case VLC_FOURCC('J','4','2','2'):
  71             switch( p_vout->output.i_chroma )
  72             {
  73                 case VLC_FOURCC('I','4','2','0'):
  74                 case VLC_FOURCC('I','Y','U','V'):
  75                 case VLC_FOURCC('J','4','2','0'):
  76                     p_vout->chroma.pf_convert = I422_I420;
  77                     break;
  78
  79                 case VLC_FOURCC('Y','V','1','2'):
  80                     p_vout->chroma.pf_convert = I422_YV12;
  81                     break;
  82
  83                 case VLC_FOURCC('Y','U','V','A'):
  84                     p_vout->chroma.pf_convert = I422_YUVA;
  85                     break;
  86
  87                 default:
  88                     return -1;
  89             }
  90             break;
  91
  92         default:
  93             return -1;
  94     }
  95     return 0;
  96 }
  97
  98 /* Following functions are local */
  99
 100 /*****************************************************************************
 101  * I422_I420: planar YUV 4:2:2 to planar I420 4:2:0 Y:U:V
 102  *****************************************************************************/
 103 static void I422_I420( vout_thread_t *p_vout, picture_t *p_source,
 104                                               picture_t *p_dest )
 105 {
 106     uint16_t i_dpy = p_dest->p[Y_PLANE].i_pitch;
 107     uint16_t i_spy = p_source->p[Y_PLANE].i_pitch;
 108     uint16_t i_dpuv = p_dest->p[U_PLANE].i_pitch;
 109     uint16_t i_spuv = p_source->p[U_PLANE].i_pitch;
 110     uint16_t i_width = p_vout->render.i_width;
 111     uint16_t i_y = p_vout->render.i_height;
 112     uint8_t *p_dy = p_dest->Y_PIXELS + (i_y-1)*i_dpy;
 113     uint8_t *p_y = p_source->Y_PIXELS + (i_y-1)*i_spy;
 114     uint8_t *p_du = p_dest->U_PIXELS + (i_y/2-1)*i_dpuv;
 115     uint8_t *p_u = p_source->U_PIXELS + (i_y-1)*i_spuv;
 116     uint8_t *p_dv = p_dest->V_PIXELS + (i_y/2-1)*i_dpuv;
 117     uint8_t *p_v = p_source->V_PIXELS + (i_y-1)*i_spuv;
 118     void *(*pf_memcpy)(void *, const void *, size_t) = p_vout->p_libvlc->pf_memcpy;
 119     i_y /= 2;
 120
 121     for ( ; i_y--; )
 122     {
 123         pf_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 124         pf_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 125         pf_memcpy(p_du, p_u, i_width/2); p_du -= i_dpuv; p_u -= 2*i_spuv;
 126         pf_memcpy(p_dv, p_v, i_width/2); p_dv -= i_dpuv; p_v -= 2*i_spuv;
 127     }
 128 }
 129
 130 /*****************************************************************************
 131  * I422_YV12: planar YUV 4:2:2 to planar YV12 4:2:0 Y:V:U
 132  *****************************************************************************/
 133 static void I422_YV12( vout_thread_t *p_vout, picture_t *p_source,
 134                                               picture_t *p_dest )
 135 {
 136     uint16_t i_dpy = p_dest->p[Y_PLANE].i_pitch;
 137     uint16_t i_spy = p_source->p[Y_PLANE].i_pitch;
 138     uint16_t i_dpuv = p_dest->p[U_PLANE].i_pitch;
 139     uint16_t i_spuv = p_source->p[U_PLANE].i_pitch;
 140     uint16_t i_width = p_vout->render.i_width;
 141     uint16_t i_y = p_vout->render.i_height;
 142     uint8_t *p_dy = p_dest->Y_PIXELS + (i_y-1)*i_dpy;
 143     uint8_t *p_y = p_source->Y_PIXELS + (i_y-1)*i_spy;
 144     uint8_t *p_du = p_dest->V_PIXELS + (i_y/2-1)*i_dpuv; /* U and V are swapped */
 145     uint8_t *p_u = p_source->U_PIXELS + (i_y-1)*i_spuv;
 146     uint8_t *p_dv = p_dest->U_PIXELS + (i_y/2-1)*i_dpuv; /* U and V are swapped */
 147     uint8_t *p_v = p_source->V_PIXELS + (i_y-1)*i_spuv;
 148     void *(*pf_memcpy)(void *, const void *, size_t) = p_vout->p_libvlc->pf_memcpy;
 149     i_y /= 2;
 150
 151     for ( ; i_y--; )
 152     {
 153         pf_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 154         pf_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 155         pf_memcpy(p_du, p_u, i_width/2); p_du -= i_dpuv; p_u -= 2*i_spuv;
 156         pf_memcpy(p_dv, p_v, i_width/2); p_dv -= i_dpuv; p_v -= 2*i_spuv;
 157     }
 158 }
 159
 160 /*****************************************************************************
 161  * I422_YUVA: planar YUV 4:2:2 to planar YUVA 4:2:0:4 Y:U:V:A
 162  *****************************************************************************/
 163 static void I422_YUVA( vout_thread_t *p_vout, picture_t *p_source,
 164                                               picture_t *p_dest )
 165 {
 166     I422_I420( p_vout, p_source, p_dest );
 167     p_vout->p_libvlc->pf_memset( p_dest->p[A_PLANE].p_pixels, 0xff,
 168                                  p_dest->p[A_PLANE].i_lines
 169                                  * p_dest->p[A_PLANE].i_pitch );
 170 }