modules/video_chroma/rv32.c

   1 /*****************************************************************************
   2  * rv32.c: conversion plugin to RV32 format.
   3  *****************************************************************************
   4  * Copyright (C) 2005 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Author: Cyril Deguet <asmax@videolan.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #include <vlc_common.h>
  32 #include <vlc_plugin.h>
  33 #include <vlc_filter.h>
  34 #include <vlc_picture.h>
  35
  36 /****************************************************************************
  37  * Local prototypes
  38  ****************************************************************************/
  39 static int  OpenFilter ( vlc_object_t * );
  40 static picture_t *Filter( filter_t *, picture_t * );
  41
  42 /*****************************************************************************
  43  * Module descriptor
  44  *****************************************************************************/
  45 vlc_module_begin ()
  46     set_description( N_("RV32 conversion filter") )
  47     set_capability( "video converter", 1 )
  48     set_callbacks( OpenFilter, NULL )
  49 vlc_module_end ()
  50
  51 /*****************************************************************************
  52  * OpenFilter: probe the filter and return score
  53  *****************************************************************************/
  54 static int OpenFilter( vlc_object_t *p_this )
  55 {
  56     filter_t *p_filter = (filter_t*)p_this;
  57
  58     /* XXX Only support RV24 -> RV32 conversion */
  59     if( p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGB24 ||
  60         (p_filter->fmt_out.video.i_chroma != VLC_CODEC_RGB32 &&
  61         p_filter->fmt_out.video.i_chroma != VLC_CODEC_RGBA) )
  62     {
  63         return VLC_EGENERIC;
  64     }
  65
  66     if( p_filter->fmt_in.video.i_width != p_filter->fmt_out.video.i_width
  67      || p_filter->fmt_in.video.i_height != p_filter->fmt_out.video.i_height
  68      || p_filter->fmt_in.video.orientation != p_filter->fmt_out.video.orientation)
  69         return -1;
  70
  71     p_filter->pf_video_filter = Filter;
  72
  73     return VLC_SUCCESS;
  74 }
  75
  76 /****************************************************************************
  77  * Filter: the whole thing
  78  ****************************************************************************/
  79 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
  80 {
  81     picture_t *p_pic_dst;
  82     int i_plane, i;
  83     unsigned int j;
  84
  85     /* Request output picture */
  86     p_pic_dst = filter_NewPicture( p_filter );
  87     if( !p_pic_dst )
  88     {
  89         picture_Release( p_pic );
  90         return NULL;
  91     }
  92
  93     /* Convert RV24 to RV32 */
  94     for( i_plane = 0; i_plane < p_pic_dst->i_planes; i_plane++ )
  95     {
  96         uint8_t *p_src = p_pic->p[i_plane].p_pixels;
  97         uint8_t *p_dst = p_pic_dst->p[i_plane].p_pixels;
  98         unsigned int i_width = p_filter->fmt_out.video.i_width;
  99
 100         for( i = 0; i < p_pic_dst->p[i_plane].i_lines; i++ )
 101         {
 102             for( j = 0; j < i_width; j++ )
 103             {
 104                 *(p_dst++) = p_src[2];
 105                 *(p_dst++) = p_src[1];
 106                 *(p_dst++) = p_src[0];
 107                 *(p_dst++) = 0xff;  /* Alpha */
 108                 p_src += 3;
 109             }
 110             p_src += p_pic->p[i_plane].i_pitch - 3 * i_width;
 111             p_dst += p_pic_dst->p[i_plane].i_pitch - 4 * i_width;
 112         }
 113     }
 114
 115     picture_CopyProperties( p_pic_dst, p_pic );
 116     picture_Release( p_pic );
 117
 118     return p_pic_dst;
 119 }
 120