git.sesse.net Git - vlc/blob - modules/video_filter/scale.c

   1 /*****************************************************************************
   2  * resize.c: video scaling module for YUVP/A, I420 and RGBA pictures
   3  *  Uses the low quality "nearest neighbour" algorithm.
   4  *****************************************************************************
   5  * Copyright (C) 2003-2007 the VideoLAN team
   6  * $Id$
   7  *
   8  * Authors: Gildas Bazin <gbazin@videolan.org>
   9  *          Antoine Cellerier <dionoea @t videolan dot org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  24  *****************************************************************************/
  25
  26 /*****************************************************************************
  27  * Preamble
  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 /****************************************************************************
  38  * Local prototypes
  39  ****************************************************************************/
  40 static int  OpenFilter ( vlc_object_t * );
  41 static void CloseFilter( vlc_object_t * );
  42
  43 static picture_t *Filter( filter_t *, picture_t * );
  44
  45 /*****************************************************************************
  46  * Module descriptor
  47  *****************************************************************************/
  48 vlc_module_begin ()
  49     set_description( N_("Video scaling filter") )
  50     set_capability( "video filter2", 10 )
  51     set_callbacks( OpenFilter, CloseFilter )
  52 vlc_module_end ()
  53
  54 /*****************************************************************************
  55  * OpenFilter: probe the filter and return score
  56  *****************************************************************************/
  57 static int OpenFilter( vlc_object_t *p_this )
  58 {
  59     filter_t *p_filter = (filter_t*)p_this;
  60
  61     if( ( p_filter->fmt_in.video.i_chroma != VLC_CODEC_YUVP &&
  62           p_filter->fmt_in.video.i_chroma != VLC_CODEC_YUVA &&
  63           p_filter->fmt_in.video.i_chroma != VLC_CODEC_I420 &&
  64           p_filter->fmt_in.video.i_chroma != VLC_CODEC_YV12 &&
  65           p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGB32 &&
  66           p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGBA ) ||
  67         p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
  68     {
  69         return VLC_EGENERIC;
  70     }
  71
  72     p_filter->pf_video_filter = Filter;
  73
  74     msg_Dbg( p_filter, "%ix%i -> %ix%i", p_filter->fmt_in.video.i_width,
  75              p_filter->fmt_in.video.i_height, p_filter->fmt_out.video.i_width,
  76              p_filter->fmt_out.video.i_height );
  77
  78     return VLC_SUCCESS;
  79 }
  80
  81 /*****************************************************************************
  82  * CloseFilter: clean up the filter
  83  *****************************************************************************/
  84 static void CloseFilter( vlc_object_t *p_this )
  85 {
  86     (void)p_this;
  87 }
  88
  89 /****************************************************************************
  90  * Filter: the whole thing
  91  ****************************************************************************/
  92 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
  93 {
  94     picture_t *p_pic_dst;
  95     int i_plane;
  96
  97     if( !p_pic ) return NULL;
  98
  99     if( (p_filter->fmt_in.video.i_height == 0) ||
 100         (p_filter->fmt_in.video.i_width == 0) )
 101         return NULL;
 102
 103     if( (p_filter->fmt_out.video.i_height == 0) ||
 104         (p_filter->fmt_out.video.i_width == 0) )
 105         return NULL;
 106
 107     /* Request output picture */
 108     p_pic_dst = filter_NewPicture( p_filter );
 109     if( !p_pic_dst )
 110     {
 111         picture_Release( p_pic );
 112         return NULL;
 113     }
 114
 115     if( p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGBA &&
 116         p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGB32 )
 117     {
 118         for( i_plane = 0; i_plane < p_pic_dst->i_planes; i_plane++ )
 119         {
 120             const int i_src_pitch    = p_pic->p[i_plane].i_pitch;
 121             const int i_dst_pitch    = p_pic_dst->p[i_plane].i_pitch;
 122             const int i_src_height   = p_filter->fmt_in.video.i_height;
 123             const int i_src_width    = p_filter->fmt_in.video.i_width;
 124             const int i_dst_height   = p_filter->fmt_out.video.i_height;
 125             const int i_dst_width    = p_filter->fmt_out.video.i_width;
 126             const int i_dst_visible_lines =
 127                                        p_pic_dst->p[i_plane].i_visible_lines;
 128             const int i_dst_visible_pitch =
 129                                        p_pic_dst->p[i_plane].i_visible_pitch;
 130             const int i_dst_hidden_pitch  = i_dst_pitch - i_dst_visible_pitch;
 131 #define SHIFT_SIZE 16
 132             const int i_height_coef  = ( i_src_height << SHIFT_SIZE )
 133                                        / i_dst_height;
 134             const int i_width_coef   = ( i_src_width << SHIFT_SIZE )
 135                                        / i_dst_width;
 136             const int i_src_height_1 = i_src_height - 1;
 137             const int i_src_width_1  = i_src_width - 1;
 138
 139             uint8_t *p_src = p_pic->p[i_plane].p_pixels;
 140             uint8_t *p_dst = p_pic_dst->p[i_plane].p_pixels;
 141             uint8_t *p_dstendline = p_dst + i_dst_visible_pitch;
 142             const uint8_t *p_dstend = p_dst + i_dst_visible_lines*i_dst_pitch;
 143
 144             const int i_shift_height = i_dst_height / i_src_height;
 145             const int i_shift_width = i_dst_width / i_src_width;
 146
 147             int l = 1<<(SHIFT_SIZE-i_shift_height);
 148             for( ; p_dst < p_dstend;
 149                  p_dst += i_dst_hidden_pitch,
 150                  p_dstendline += i_dst_pitch, l += i_height_coef )
 151             {
 152                 int k = 1<<(SHIFT_SIZE-i_shift_width);
 153                 uint8_t *p_srcl = p_src
 154                        + (__MIN( i_src_height_1, l >> SHIFT_SIZE )*i_src_pitch);
 155
 156                 for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
 157                 {
 158                     *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
 159                 }
 160             }
 161         }
 162     }
 163     else /* RGBA */
 164     {
 165         const int i_src_pitch = p_pic->p->i_pitch;
 166         const int i_dst_pitch = p_pic_dst->p->i_pitch;
 167         const int i_src_height   = p_filter->fmt_in.video.i_height;
 168         const int i_src_width    = p_filter->fmt_in.video.i_width;
 169         const int i_dst_height   = p_filter->fmt_out.video.i_height;
 170         const int i_dst_width    = p_filter->fmt_out.video.i_width;
 171         const int i_dst_visible_lines =
 172                                    p_pic_dst->p->i_visible_lines;
 173         const int i_dst_visible_pitch =
 174                                    p_pic_dst->p->i_visible_pitch;
 175         const int i_dst_hidden_pitch  = i_dst_pitch - i_dst_visible_pitch;
 176         const int i_height_coef  = ( i_src_height << SHIFT_SIZE )
 177                                    / i_dst_height;
 178         const int i_width_coef   = ( i_src_width << SHIFT_SIZE )
 179                                    / i_dst_width;
 180         const int i_src_height_1 = i_src_height - 1;
 181         const int i_src_width_1  = i_src_width - 1;
 182
 183         uint32_t *p_src = (uint32_t*)p_pic->p->p_pixels;
 184         uint32_t *p_dst = (uint32_t*)p_pic_dst->p->p_pixels;
 185         uint32_t *p_dstendline = p_dst + (i_dst_visible_pitch>>2);
 186         const uint32_t *p_dstend = p_dst + i_dst_visible_lines*(i_dst_pitch>>2);
 187
 188         const int i_shift_height = i_dst_height / i_src_height;
 189         const int i_shift_width = i_dst_width / i_src_width;
 190
 191         int l = 1<<(SHIFT_SIZE-i_shift_height);
 192         for( ; p_dst < p_dstend;
 193              p_dst += (i_dst_hidden_pitch>>2),
 194              p_dstendline += (i_dst_pitch>>2),
 195              l += i_height_coef )
 196         {
 197             int k = 1<<(SHIFT_SIZE-i_shift_width);
 198             uint32_t *p_srcl = p_src
 199                     + (__MIN( i_src_height_1, l >> SHIFT_SIZE )*(i_src_pitch>>2));
 200             for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
 201             {
 202                 *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
 203             }
 204         }
 205     }
 206
 207     picture_CopyProperties( p_pic_dst, p_pic );
 208     picture_Release( p_pic );
 209     return p_pic_dst;
 210 }