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  * filter_sys_t : filter descriptor
  39  *****************************************************************************/
  40 struct filter_sys_t
  41 {
  42     es_format_t fmt_in;
  43     es_format_t fmt_out;
  44 };
  45
  46 /****************************************************************************
  47  * Local prototypes
  48  ****************************************************************************/
  49 static int  OpenFilter ( vlc_object_t * );
  50 static void CloseFilter( vlc_object_t * );
  51
  52 static picture_t *Filter( filter_t *, picture_t * );
  53
  54 /*****************************************************************************
  55  * Module descriptor
  56  *****************************************************************************/
  57 vlc_module_begin ()
  58     set_description( N_("Video scaling filter") )
  59     set_capability( "video filter2", 10 )
  60     set_callbacks( OpenFilter, CloseFilter )
  61 vlc_module_end ()
  62
  63 /*****************************************************************************
  64  * OpenFilter: probe the filter and return score
  65  *****************************************************************************/
  66 static int OpenFilter( vlc_object_t *p_this )
  67 {
  68     filter_t *p_filter = (filter_t*)p_this;
  69     filter_sys_t *p_sys;
  70
  71     if( ( p_filter->fmt_in.video.i_chroma != VLC_CODEC_YUVP &&
  72           p_filter->fmt_in.video.i_chroma != VLC_CODEC_YUVA &&
  73           p_filter->fmt_in.video.i_chroma != VLC_CODEC_I420 &&
  74           p_filter->fmt_in.video.i_chroma != VLC_CODEC_YV12 &&
  75           p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGB32 &&
  76           p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGBA ) ||
  77         p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
  78     {
  79         return VLC_EGENERIC;
  80     }
  81
  82     /* Allocate the memory needed to store the decoder's structure */
  83     if( ( p_filter->p_sys = p_sys =
  84           (filter_sys_t *)malloc(sizeof(filter_sys_t)) ) == NULL )
  85         return VLC_ENOMEM;
  86
  87     p_filter->pf_video_filter = Filter;
  88
  89     msg_Dbg( p_filter, "%ix%i -> %ix%i", p_filter->fmt_in.video.i_width,
  90              p_filter->fmt_in.video.i_height, p_filter->fmt_out.video.i_width,
  91              p_filter->fmt_out.video.i_height );
  92
  93     return VLC_SUCCESS;
  94 }
  95
  96 /*****************************************************************************
  97  * CloseFilter: clean up the filter
  98  *****************************************************************************/
  99 static void CloseFilter( vlc_object_t *p_this )
 100 {
 101     filter_t *p_filter = (filter_t*)p_this;
 102     filter_sys_t *p_sys = p_filter->p_sys;
 103
 104     free( p_sys );
 105 }
 106
 107 /****************************************************************************
 108  * Filter: the whole thing
 109  ****************************************************************************/
 110 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 111 {
 112     picture_t *p_pic_dst;
 113     int i_plane;
 114
 115     if( !p_pic ) return NULL;
 116
 117     if( (p_filter->fmt_in.video.i_height == 0) ||
 118         (p_filter->fmt_in.video.i_width == 0) )
 119         return NULL;
 120
 121     if( (p_filter->fmt_out.video.i_height == 0) ||
 122         (p_filter->fmt_out.video.i_width == 0) )
 123         return NULL;
 124
 125     /* Request output picture */
 126     p_pic_dst = filter_NewPicture( p_filter );
 127     if( !p_pic_dst )
 128     {
 129         picture_Release( p_pic );
 130         return NULL;
 131     }
 132
 133     if( p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGBA &&
 134         p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGB32 )
 135     {
 136         for( i_plane = 0; i_plane < p_pic_dst->i_planes; i_plane++ )
 137         {
 138             const int i_src_pitch    = p_pic->p[i_plane].i_pitch;
 139             const int i_dst_pitch    = p_pic_dst->p[i_plane].i_pitch;
 140             const int i_src_height   = p_filter->fmt_in.video.i_height;
 141             const int i_src_width    = p_filter->fmt_in.video.i_width;
 142             const int i_dst_height   = p_filter->fmt_out.video.i_height;
 143             const int i_dst_width    = p_filter->fmt_out.video.i_width;
 144             const int i_dst_visible_lines =
 145                                        p_pic_dst->p[i_plane].i_visible_lines;
 146             const int i_dst_visible_pitch =
 147                                        p_pic_dst->p[i_plane].i_visible_pitch;
 148             const int i_dst_hidden_pitch  = i_dst_pitch - i_dst_visible_pitch;
 149 #define SHIFT_SIZE 16
 150             const int i_height_coef  = ( i_src_height << SHIFT_SIZE )
 151                                        / i_dst_height;
 152             const int i_width_coef   = ( i_src_width << SHIFT_SIZE )
 153                                        / i_dst_width;
 154             const int i_src_height_1 = i_src_height - 1;
 155             const int i_src_width_1  = i_src_width - 1;
 156
 157             uint8_t *p_src = p_pic->p[i_plane].p_pixels;
 158             uint8_t *p_dst = p_pic_dst->p[i_plane].p_pixels;
 159             uint8_t *p_dstendline = p_dst + i_dst_visible_pitch;
 160             const uint8_t *p_dstend = p_dst + i_dst_visible_lines*i_dst_pitch;
 161
 162             const int i_shift_height = i_dst_height / i_src_height;
 163             const int i_shift_width = i_dst_width / i_src_width;
 164
 165             int l = 1<<(SHIFT_SIZE-i_shift_height);
 166             for( ; p_dst < p_dstend;
 167                  p_dst += i_dst_hidden_pitch,
 168                  p_dstendline += i_dst_pitch, l += i_height_coef )
 169             {
 170                 int k = 1<<(SHIFT_SIZE-i_shift_width);
 171                 uint8_t *p_srcl = p_src
 172                        + (__MIN( i_src_height_1, l >> SHIFT_SIZE )*i_src_pitch);
 173
 174                 for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
 175                 {
 176                     *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
 177                 }
 178             }
 179         }
 180     }
 181     else /* RGBA */
 182     {
 183         const int i_src_pitch = p_pic->p->i_pitch;
 184         const int i_dst_pitch = p_pic_dst->p->i_pitch;
 185         const int i_src_height   = p_filter->fmt_in.video.i_height;
 186         const int i_src_width    = p_filter->fmt_in.video.i_width;
 187         const int i_dst_height   = p_filter->fmt_out.video.i_height;
 188         const int i_dst_width    = p_filter->fmt_out.video.i_width;
 189         const int i_dst_visible_lines =
 190                                    p_pic_dst->p->i_visible_lines;
 191         const int i_dst_visible_pitch =
 192                                    p_pic_dst->p->i_visible_pitch;
 193         const int i_dst_hidden_pitch  = i_dst_pitch - i_dst_visible_pitch;
 194         const int i_height_coef  = ( i_src_height << SHIFT_SIZE )
 195                                    / i_dst_height;
 196         const int i_width_coef   = ( i_src_width << SHIFT_SIZE )
 197                                    / i_dst_width;
 198         const int i_src_height_1 = i_src_height - 1;
 199         const int i_src_width_1  = i_src_width - 1;
 200
 201         uint32_t *p_src = (uint32_t*)p_pic->p->p_pixels;
 202         uint32_t *p_dst = (uint32_t*)p_pic_dst->p->p_pixels;
 203         uint32_t *p_dstendline = p_dst + (i_dst_visible_pitch>>2);
 204         const uint32_t *p_dstend = p_dst + i_dst_visible_lines*(i_dst_pitch>>2);
 205
 206         const int i_shift_height = i_dst_height / i_src_height;
 207         const int i_shift_width = i_dst_width / i_src_width;
 208
 209         int l = 1<<(SHIFT_SIZE-i_shift_height);
 210         for( ; p_dst < p_dstend;
 211              p_dst += (i_dst_hidden_pitch>>2),
 212              p_dstendline += (i_dst_pitch>>2),
 213              l += i_height_coef )
 214         {
 215             int k = 1<<(SHIFT_SIZE-i_shift_width);
 216             uint32_t *p_srcl = p_src
 217                     + (__MIN( i_src_height_1, l >> SHIFT_SIZE )*(i_src_pitch>>2));
 218             for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
 219             {
 220                 *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
 221             }
 222         }
 223     }
 224
 225     picture_CopyProperties( p_pic_dst, p_pic );
 226     picture_Release( p_pic );
 227     return p_pic_dst;
 228 }