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_vout.h>
  36 #include "vlc_filter.h"
  37
  38 /*****************************************************************************
  39  * filter_sys_t : filter descriptor
  40  *****************************************************************************/
  41 struct filter_sys_t
  42 {
  43     es_format_t fmt_in;
  44     es_format_t fmt_out;
  45 };
  46
  47 /****************************************************************************
  48  * Local prototypes
  49  ****************************************************************************/
  50 static int  OpenFilter ( vlc_object_t * );
  51 static void CloseFilter( vlc_object_t * );
  52
  53 static picture_t *Filter( filter_t *, picture_t * );
  54
  55 /*****************************************************************************
  56  * Module descriptor
  57  *****************************************************************************/
  58 vlc_module_begin ()
  59     set_description( N_("Video scaling filter") )
  60     set_capability( "video filter2", 10 )
  61     set_callbacks( OpenFilter, CloseFilter )
  62 vlc_module_end ()
  63
  64 /*****************************************************************************
  65  * OpenFilter: probe the filter and return score
  66  *****************************************************************************/
  67 static int OpenFilter( vlc_object_t *p_this )
  68 {
  69     filter_t *p_filter = (filter_t*)p_this;
  70     filter_sys_t *p_sys;
  71
  72     if( ( p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','U','V','P') &&
  73           p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','U','V','A') &&
  74           p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','0') &&
  75           p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','V','1','2') &&
  76           p_filter->fmt_in.video.i_chroma != VLC_FOURCC('R','V','3','2') &&
  77           p_filter->fmt_in.video.i_chroma != VLC_FOURCC('R','G','B','A') ) ||
  78         p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
  79     {
  80         return VLC_EGENERIC;
  81     }
  82
  83     /* Allocate the memory needed to store the decoder's structure */
  84     if( ( p_filter->p_sys = p_sys =
  85           (filter_sys_t *)malloc(sizeof(filter_sys_t)) ) == NULL )
  86         return VLC_ENOMEM;
  87
  88     p_filter->pf_video_filter = Filter;
  89
  90     msg_Dbg( p_filter, "%ix%i -> %ix%i", p_filter->fmt_in.video.i_width,
  91              p_filter->fmt_in.video.i_height, p_filter->fmt_out.video.i_width,
  92              p_filter->fmt_out.video.i_height );
  93
  94     return VLC_SUCCESS;
  95 }
  96
  97 /*****************************************************************************
  98  * CloseFilter: clean up the filter
  99  *****************************************************************************/
 100 static void CloseFilter( vlc_object_t *p_this )
 101 {
 102     filter_t *p_filter = (filter_t*)p_this;
 103     filter_sys_t *p_sys = p_filter->p_sys;
 104
 105     free( p_sys );
 106 }
 107
 108 /****************************************************************************
 109  * Filter: the whole thing
 110  ****************************************************************************/
 111 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 112 {
 113     picture_t *p_pic_dst;
 114     int i_plane;
 115
 116     if( !p_pic ) return NULL;
 117
 118     if( (p_filter->fmt_in.video.i_height == 0) ||
 119         (p_filter->fmt_in.video.i_width == 0) )
 120         return NULL;
 121
 122     if( (p_filter->fmt_out.video.i_height == 0) ||
 123         (p_filter->fmt_out.video.i_width == 0) )
 124         return NULL;
 125
 126     /* Request output picture */
 127     p_pic_dst = filter_NewPicture( p_filter );
 128     if( !p_pic_dst )
 129     {
 130         picture_Release( p_pic );
 131         return NULL;
 132     }
 133
 134     if( p_filter->fmt_in.video.i_chroma != VLC_FOURCC('R','G','B','A') &&
 135         p_filter->fmt_in.video.i_chroma != VLC_FOURCC('R','V','3','2') )
 136     {
 137         for( i_plane = 0; i_plane < p_pic_dst->i_planes; i_plane++ )
 138         {
 139             const int i_src_pitch    = p_pic->p[i_plane].i_pitch;
 140             const int i_dst_pitch    = p_pic_dst->p[i_plane].i_pitch;
 141             const int i_src_height   = p_filter->fmt_in.video.i_height;
 142             const int i_src_width    = p_filter->fmt_in.video.i_width;
 143             const int i_dst_height   = p_filter->fmt_out.video.i_height;
 144             const int i_dst_width    = p_filter->fmt_out.video.i_width;
 145             const int i_dst_visible_lines =
 146                                        p_pic_dst->p[i_plane].i_visible_lines;
 147             const int i_dst_visible_pitch =
 148                                        p_pic_dst->p[i_plane].i_visible_pitch;
 149             const int i_dst_hidden_pitch  = i_dst_pitch - i_dst_visible_pitch;
 150 #define SHIFT_SIZE 16
 151             const int i_height_coef  = ( i_src_height << SHIFT_SIZE )
 152                                        / i_dst_height;
 153             const int i_width_coef   = ( i_src_width << SHIFT_SIZE )
 154                                        / i_dst_width;
 155             const int i_src_height_1 = i_src_height - 1;
 156             const int i_src_width_1  = i_src_width - 1;
 157
 158             uint8_t *p_src = p_pic->p[i_plane].p_pixels;
 159             uint8_t *p_dst = p_pic_dst->p[i_plane].p_pixels;
 160             uint8_t *p_dstendline = p_dst + i_dst_visible_pitch;
 161             const uint8_t *p_dstend = p_dst + i_dst_visible_lines*i_dst_pitch;
 162
 163             const int i_shift_height = i_dst_height / i_src_height;
 164             const int i_shift_width = i_dst_width / i_src_width;
 165
 166             int l = 1<<(SHIFT_SIZE-i_shift_height);
 167             for( ; p_dst < p_dstend;
 168                  p_dst += i_dst_hidden_pitch,
 169                  p_dstendline += i_dst_pitch, l += i_height_coef )
 170             {
 171                 int k = 1<<(SHIFT_SIZE-i_shift_width);
 172                 uint8_t *p_srcl = p_src
 173                        + (__MIN( i_src_height_1, l >> SHIFT_SIZE )*i_src_pitch);
 174
 175                 for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
 176                 {
 177                     *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
 178                 }
 179             }
 180         }
 181     }
 182     else /* RGBA */
 183     {
 184         const int i_src_pitch = p_pic->p->i_pitch;
 185         const int i_dst_pitch = p_pic_dst->p->i_pitch;
 186         const int i_src_height   = p_filter->fmt_in.video.i_height;
 187         const int i_src_width    = p_filter->fmt_in.video.i_width;
 188         const int i_dst_height   = p_filter->fmt_out.video.i_height;
 189         const int i_dst_width    = p_filter->fmt_out.video.i_width;
 190         const int i_dst_visible_lines =
 191                                    p_pic_dst->p->i_visible_lines;
 192         const int i_dst_visible_pitch =
 193                                    p_pic_dst->p->i_visible_pitch;
 194         const int i_dst_hidden_pitch  = i_dst_pitch - i_dst_visible_pitch;
 195         const int i_height_coef  = ( i_src_height << SHIFT_SIZE )
 196                                    / i_dst_height;
 197         const int i_width_coef   = ( i_src_width << SHIFT_SIZE )
 198                                    / i_dst_width;
 199         const int i_src_height_1 = i_src_height - 1;
 200         const int i_src_width_1  = i_src_width - 1;
 201
 202         uint32_t *p_src = (uint32_t*)p_pic->p->p_pixels;
 203         uint32_t *p_dst = (uint32_t*)p_pic_dst->p->p_pixels;
 204         uint32_t *p_dstendline = p_dst + (i_dst_visible_pitch>>2);
 205         const uint32_t *p_dstend = p_dst + i_dst_visible_lines*(i_dst_pitch>>2);
 206
 207         const int i_shift_height = i_dst_height / i_src_height;
 208         const int i_shift_width = i_dst_width / i_src_width;
 209
 210         int l = 1<<(SHIFT_SIZE-i_shift_height);
 211         for( ; p_dst < p_dstend;
 212              p_dst += (i_dst_hidden_pitch>>2),
 213              p_dstendline += (i_dst_pitch>>2),
 214              l += i_height_coef )
 215         {
 216             int k = 1<<(SHIFT_SIZE-i_shift_width);
 217             uint32_t *p_srcl = p_src
 218                     + (__MIN( i_src_height_1, l >> SHIFT_SIZE )*(i_src_pitch>>2));
 219             for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
 220             {
 221                 *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
 222             }
 223         }
 224     }
 225
 226     picture_CopyProperties( p_pic_dst, p_pic );
 227     picture_Release( p_pic );
 228     return p_pic_dst;
 229 }