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

   1 /*****************************************************************************
   2  * scale.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 VLC authors and VideoLAN
   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 it
  12  * under the terms of the GNU Lesser General Public License as published by
  13  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU Lesser General Public License
  22  * along with this program; if not, write to the Free Software Foundation,
  23  * 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 picture_t *Filter( filter_t *, picture_t * );
  42
  43 /*****************************************************************************
  44  * Module descriptor
  45  *****************************************************************************/
  46 vlc_module_begin ()
  47     set_description( N_("Video scaling filter") )
  48     set_capability( "video filter2", 10 )
  49     set_callbacks( OpenFilter, NULL )
  50 vlc_module_end ()
  51
  52 /*****************************************************************************
  53  * OpenFilter: probe the filter and return score
  54  *****************************************************************************/
  55 static int OpenFilter( vlc_object_t *p_this )
  56 {
  57     filter_t *p_filter = (filter_t*)p_this;
  58
  59     if( ( p_filter->fmt_in.video.i_chroma != VLC_CODEC_YUVP &&
  60           p_filter->fmt_in.video.i_chroma != VLC_CODEC_YUVA &&
  61           p_filter->fmt_in.video.i_chroma != VLC_CODEC_I420 &&
  62           p_filter->fmt_in.video.i_chroma != VLC_CODEC_YV12 &&
  63           p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGB32 &&
  64           p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGBA &&
  65           p_filter->fmt_in.video.i_chroma != VLC_CODEC_ARGB ) ||
  66         p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
  67     {
  68         return VLC_EGENERIC;
  69     }
  70
  71     if( p_filter->fmt_in.video.orientation != p_filter->fmt_out.video.orientation )
  72         return VLC_EGENERIC;
  73
  74     video_format_ScaleCropAr( &p_filter->fmt_out.video, &p_filter->fmt_in.video );
  75     p_filter->pf_video_filter = Filter;
  76
  77     msg_Dbg( p_filter, "%ix%i -> %ix%i", p_filter->fmt_in.video.i_width,
  78              p_filter->fmt_in.video.i_height, p_filter->fmt_out.video.i_width,
  79              p_filter->fmt_out.video.i_height );
  80
  81     return VLC_SUCCESS;
  82 }
  83
  84 /****************************************************************************
  85  * Filter: the whole thing
  86  ****************************************************************************/
  87 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
  88 {
  89     picture_t *p_pic_dst;
  90     int i_plane;
  91
  92     if( !p_pic ) return NULL;
  93
  94     if( (p_filter->fmt_in.video.i_height == 0) ||
  95         (p_filter->fmt_in.video.i_width == 0) )
  96         return NULL;
  97
  98     if( (p_filter->fmt_out.video.i_height == 0) ||
  99         (p_filter->fmt_out.video.i_width == 0) )
 100         return NULL;
 101
 102     video_format_ScaleCropAr( &p_filter->fmt_out.video, &p_filter->fmt_in.video );
 103
 104     /* Request output picture */
 105     p_pic_dst = filter_NewPicture( p_filter );
 106     if( !p_pic_dst )
 107     {
 108         picture_Release( p_pic );
 109         return NULL;
 110     }
 111
 112     if( p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGBA &&
 113         p_filter->fmt_in.video.i_chroma != VLC_CODEC_ARGB &&
 114         p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGB32 )
 115     {
 116         for( i_plane = 0; i_plane < p_pic_dst->i_planes; i_plane++ )
 117         {
 118             const int i_src_pitch    = p_pic->p[i_plane].i_pitch;
 119             const int i_dst_pitch    = p_pic_dst->p[i_plane].i_pitch;
 120             const int i_src_height   = p_filter->fmt_in.video.i_height;
 121             const int i_src_width    = p_filter->fmt_in.video.i_width;
 122             const int i_dst_height   = p_filter->fmt_out.video.i_height;
 123             const int i_dst_width    = p_filter->fmt_out.video.i_width;
 124             const int i_dst_visible_lines =
 125                                        p_pic_dst->p[i_plane].i_visible_lines;
 126             const int i_dst_visible_pitch =
 127                                        p_pic_dst->p[i_plane].i_visible_pitch;
 128             const int i_dst_hidden_pitch  = i_dst_pitch - i_dst_visible_pitch;
 129 #define SHIFT_SIZE 16
 130             const int i_height_coef  = ( i_src_height << SHIFT_SIZE )
 131                                        / i_dst_height;
 132             const int i_width_coef   = ( i_src_width << SHIFT_SIZE )
 133                                        / i_dst_width;
 134             const int i_src_height_1 = i_src_height - 1;
 135             const int i_src_width_1  = i_src_width - 1;
 136
 137             uint8_t *p_src = p_pic->p[i_plane].p_pixels;
 138             uint8_t *p_dst = p_pic_dst->p[i_plane].p_pixels;
 139             uint8_t *p_dstendline = p_dst + i_dst_visible_pitch;
 140             const uint8_t *p_dstend = p_dst + i_dst_visible_lines*i_dst_pitch;
 141
 142             const int i_shift_height = i_dst_height / i_src_height;
 143             const int i_shift_width = i_dst_width / i_src_width;
 144
 145             int l = 1<<(SHIFT_SIZE-i_shift_height);
 146             for( ; p_dst < p_dstend;
 147                  p_dst += i_dst_hidden_pitch,
 148                  p_dstendline += i_dst_pitch, l += i_height_coef )
 149             {
 150                 int k = 1<<(SHIFT_SIZE-i_shift_width);
 151                 uint8_t *p_srcl = p_src
 152                        + (__MIN( i_src_height_1, l >> SHIFT_SIZE )*i_src_pitch);
 153
 154                 for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
 155                 {
 156                     *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
 157                 }
 158             }
 159         }
 160     }
 161     else /* RGBA */
 162     {
 163         const int i_src_pitch = p_pic->p->i_pitch;
 164         const int i_dst_pitch = p_pic_dst->p->i_pitch;
 165         const int i_src_height   = p_filter->fmt_in.video.i_height;
 166         const int i_src_width    = p_filter->fmt_in.video.i_width;
 167         const int i_dst_height   = p_filter->fmt_out.video.i_height;
 168         const int i_dst_width    = p_filter->fmt_out.video.i_width;
 169         const int i_dst_visible_lines =
 170                                    p_pic_dst->p->i_visible_lines;
 171         const int i_dst_visible_pitch =
 172                                    p_pic_dst->p->i_visible_pitch;
 173         const int i_dst_hidden_pitch  = i_dst_pitch - i_dst_visible_pitch;
 174         const int i_height_coef  = ( i_src_height << SHIFT_SIZE )
 175                                    / i_dst_height;
 176         const int i_width_coef   = ( i_src_width << SHIFT_SIZE )
 177                                    / i_dst_width;
 178         const int i_src_height_1 = i_src_height - 1;
 179         const int i_src_width_1  = i_src_width - 1;
 180
 181         uint32_t *p_src = (uint32_t*)p_pic->p->p_pixels;
 182         uint32_t *p_dst = (uint32_t*)p_pic_dst->p->p_pixels;
 183         uint32_t *p_dstendline = p_dst + (i_dst_visible_pitch>>2);
 184         const uint32_t *p_dstend = p_dst + i_dst_visible_lines*(i_dst_pitch>>2);
 185
 186         const int i_shift_height = i_dst_height / i_src_height;
 187         const int i_shift_width = i_dst_width / i_src_width;
 188
 189         int l = 1<<(SHIFT_SIZE-i_shift_height);
 190         for( ; p_dst < p_dstend;
 191              p_dst += (i_dst_hidden_pitch>>2),
 192              p_dstendline += (i_dst_pitch>>2),
 193              l += i_height_coef )
 194         {
 195             int k = 1<<(SHIFT_SIZE-i_shift_width);
 196             uint32_t *p_srcl = p_src
 197                     + (__MIN( i_src_height_1, l >> SHIFT_SIZE )*(i_src_pitch>>2));
 198             for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
 199             {
 200                 *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
 201             }
 202         }
 203     }
 204
 205     picture_CopyProperties( p_pic_dst, p_pic );
 206     picture_Release( p_pic );
 207     return p_pic_dst;
 208 }