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_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','G','B','A') ) ||
  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     {
  86         msg_Err( p_filter, "out of memory" );
  87         return VLC_EGENERIC;
  88     }
  89
  90     p_filter->pf_video_filter = Filter;
  91
  92     msg_Dbg( p_filter, "%ix%i -> %ix%i", p_filter->fmt_in.video.i_width,
  93              p_filter->fmt_in.video.i_height, p_filter->fmt_out.video.i_width,
  94              p_filter->fmt_out.video.i_height );
  95
  96     return VLC_SUCCESS;
  97 }
  98
  99 /*****************************************************************************
 100  * CloseFilter: clean up the filter
 101  *****************************************************************************/
 102 static void CloseFilter( vlc_object_t *p_this )
 103 {
 104     filter_t *p_filter = (filter_t*)p_this;
 105     filter_sys_t *p_sys = p_filter->p_sys;
 106
 107     free( p_sys );
 108 }
 109
 110 /****************************************************************************
 111  * Filter: the whole thing
 112  ****************************************************************************/
 113 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 114 {
 115     picture_t *p_pic_dst;
 116     int i_plane;
 117
 118     if( !p_pic ) return NULL;
 119
 120     if( (p_filter->fmt_in.video.i_height == 0) ||
 121         (p_filter->fmt_in.video.i_width == 0) )
 122         return NULL;
 123
 124     if( (p_filter->fmt_out.video.i_height == 0) ||
 125         (p_filter->fmt_out.video.i_width == 0) )
 126         return NULL;
 127
 128     /* Request output picture */
 129     p_pic_dst = p_filter->pf_vout_buffer_new( p_filter );
 130     if( !p_pic_dst )
 131     {
 132         msg_Warn( p_filter, "can't get output picture" );
 133         if( p_pic->pf_release )
 134             p_pic->pf_release( p_pic );
 135         return NULL;
 136     }
 137
 138     if( p_filter->fmt_in.video.i_chroma != VLC_FOURCC('R','G','B','A') )
 139     {
 140         for( i_plane = 0; i_plane < p_pic_dst->i_planes; i_plane++ )
 141         {
 142             const int i_src_pitch    = p_pic->p[i_plane].i_pitch;
 143             const int i_dst_pitch    = p_pic_dst->p[i_plane].i_pitch;
 144             const int i_src_height   = p_filter->fmt_in.video.i_height;
 145             const int i_src_width    = p_filter->fmt_in.video.i_width;
 146             const int i_dst_height   = p_filter->fmt_out.video.i_height;
 147             const int i_dst_width    = p_filter->fmt_out.video.i_width;
 148             const int i_dst_visible_lines =
 149                                        p_pic_dst->p[i_plane].i_visible_lines;
 150             const int i_dst_visible_pitch =
 151                                        p_pic_dst->p[i_plane].i_visible_pitch;
 152             const int i_dst_hidden_pitch  = i_dst_pitch - i_dst_visible_pitch;
 153 #define SHIFT_SIZE 16
 154             const int i_height_coef  = ( i_src_height << SHIFT_SIZE )
 155                                        / i_dst_height;
 156             const int i_width_coef   = ( i_src_width << SHIFT_SIZE )
 157                                        / i_dst_width;
 158             const int i_src_height_1 = i_src_height - 1;
 159             const int i_src_width_1  = i_src_width - 1;
 160
 161             uint8_t *p_src = p_pic->p[i_plane].p_pixels;
 162             uint8_t *p_dst = p_pic_dst->p[i_plane].p_pixels;
 163             uint8_t *p_dstendline = p_dst + i_dst_visible_pitch;
 164             const uint8_t *p_dstend = p_dst + i_dst_visible_lines*i_dst_pitch;
 165
 166             const int i_shift_height = i_dst_height / i_src_height;
 167             const int i_shift_width = i_dst_width / i_src_width;
 168
 169             int l = 1<<(SHIFT_SIZE-i_shift_height);
 170             for( ; p_dst < p_dstend;
 171                  p_dst += i_dst_hidden_pitch,
 172                  p_dstendline += i_dst_pitch, l += i_height_coef )
 173             {
 174                 int k = 1<<(SHIFT_SIZE-i_shift_width);
 175                 uint8_t *p_srcl = p_src
 176                        + (__MIN( i_src_height_1, l >> SHIFT_SIZE )*i_src_pitch);
 177
 178                 for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
 179                 {
 180                     *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
 181                 }
 182             }
 183         }
 184     }
 185     else /* RGBA */
 186     {
 187         const int i_src_pitch = p_pic->p->i_pitch;
 188         const int i_dst_pitch = p_pic_dst->p->i_pitch;
 189         const int i_src_height   = p_filter->fmt_in.video.i_height;
 190         const int i_src_width    = p_filter->fmt_in.video.i_width;
 191         const int i_dst_height   = p_filter->fmt_out.video.i_height;
 192         const int i_dst_width    = p_filter->fmt_out.video.i_width;
 193         const int i_dst_visible_lines =
 194                                    p_pic_dst->p->i_visible_lines;
 195         const int i_dst_visible_pitch =
 196                                    p_pic_dst->p->i_visible_pitch;
 197         const int i_dst_hidden_pitch  = i_dst_pitch - i_dst_visible_pitch;
 198         const int i_height_coef  = ( i_src_height << SHIFT_SIZE )
 199                                    / i_dst_height;
 200         const int i_width_coef   = ( i_src_width << SHIFT_SIZE )
 201                                    / i_dst_width;
 202         const int i_src_height_1 = i_src_height - 1;
 203         const int i_src_width_1  = i_src_width - 1;
 204
 205         uint32_t *p_src = (uint32_t*)p_pic->p->p_pixels;
 206         uint32_t *p_dst = (uint32_t*)p_pic_dst->p->p_pixels;
 207         uint32_t *p_dstendline = p_dst + (i_dst_visible_pitch>>2);
 208         const uint32_t *p_dstend = p_dst + i_dst_visible_lines*(i_dst_pitch>>2);
 209
 210         const int i_shift_height = i_dst_height / i_src_height;
 211         const int i_shift_width = i_dst_width / i_src_width;
 212
 213         int l = 1<<(SHIFT_SIZE-i_shift_height);
 214         for( ; p_dst < p_dstend;
 215              p_dst += (i_dst_hidden_pitch>>2),
 216              p_dstendline += (i_dst_pitch>>2),
 217              l += i_height_coef )
 218         {
 219             int k = 1<<(SHIFT_SIZE-i_shift_width);
 220             uint32_t *p_srcl = p_src
 221                     + (__MIN( i_src_height_1, l >> SHIFT_SIZE )*(i_src_pitch>>2));
 222             for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
 223             {
 224                 *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
 225             }
 226         }
 227     }
 228
 229     p_pic_dst->date = p_pic->date;
 230     p_pic_dst->b_force = p_pic->b_force;
 231     p_pic_dst->i_nb_fields = p_pic->i_nb_fields;
 232     p_pic_dst->b_progressive = p_pic->b_progressive;
 233     p_pic_dst->b_top_field_first = p_pic->b_top_field_first;
 234
 235     if( p_pic->pf_release )
 236         p_pic->pf_release( p_pic );
 237     return p_pic_dst;
 238 }