/***************************************************************************** * noise.c : "add grain to image" video filter ***************************************************************************** * Copyright (C) 2000-2007 the VideoLAN team * $Id$ * * Authors: Antoine Cellerier <dionoea -at- videolan -dot- org> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA. *****************************************************************************//***************************************************************************** * Preamble *****************************************************************************/#ifdef HAVE_CONFIG_H# include "config.h"#endif#include <vlc_common.h>#include <vlc_plugin.h>#include <vlc_vout.h>#include "vlc_filter.h"#include "filter_picture.h"/***************************************************************************** * Local prototypes *****************************************************************************/static int  Create    ( vlc_object_t * );static void Destroy   ( vlc_object_t * );static picture_t *Filter( filter_t *, picture_t * );#define FILTER_PREFIX "grain-"/***************************************************************************** * Module descriptor *****************************************************************************/vlc_module_begin();    set_description( N_("Grain video filter") );    set_shortname( N_( "Grain" ));    set_capability( "video filter2", 0 );    set_category( CAT_VIDEO );    set_subcategory( SUBCAT_VIDEO_VFILTER );    set_callbacks( Create, Destroy );vlc_module_end();struct filter_sys_t{    int *p_noise;};static int Create( vlc_object_t *p_this ){    filter_t *p_filter = (filter_t *)p_this;    switch( p_filter->fmt_in.video.i_chroma )    {        CASE_PLANAR_YUV            break;        default:            msg_Err( p_filter, "Unsupported input chroma (%4s)",                     (char*)&(p_filter->fmt_in.video.i_chroma) );            return VLC_EGENERIC;    }    /* Allocate structure */    p_filter->p_sys = malloc( sizeof( filter_sys_t ) );    if( p_filter->p_sys == NULL )        return VLC_ENOMEM;    p_filter->pf_video_filter = Filter;    p_filter->p_sys->p_noise = NULL;    return VLC_SUCCESS;}static void Destroy( vlc_object_t *p_this ){    filter_t *p_filter = (filter_t *)p_this;    free( p_filter->p_sys->p_noise );    free( p_filter->p_sys );}static picture_t *Filter( filter_t *p_filter, picture_t *p_pic ){    picture_t *p_outpic;    filter_sys_t *p_sys = p_filter->p_sys;    int i_index;    if( !p_pic ) return NULL;    p_outpic = filter_NewPicture( p_filter );    if( !p_outpic )    {        picture_Release( p_pic );        return NULL;    }    {        uint8_t *p_in = p_pic->p[Y_PLANE].p_pixels;        uint8_t *p_out = p_outpic->p[Y_PLANE].p_pixels;        const int i_num_lines = p_pic->p[Y_PLANE].i_visible_lines;        const int i_num_cols = p_pic->p[Y_PLANE].i_visible_pitch;        const int i_pitch = p_pic->p[Y_PLANE].i_pitch;        int i_line, i_col;        int *p_noise = p_sys->p_noise;        if( !p_noise )        {            p_noise = p_sys->p_noise =                (int*)malloc(i_pitch*i_num_lines*sizeof(int));        }        for( i_line = 0; i_line < i_num_lines; i_line++ )        {            for( i_col = 0; i_col < i_num_cols; i_col++ )            {                p_noise[i_line*i_pitch+i_col] = ((rand()&0x1f)-0x0f);            }        }        for( i_line = 2/*0*/ ; i_line < i_num_lines-2/**/; i_line++ )        {            for( i_col = 2/*0*/; i_col < i_num_cols/2; i_col++ )            {                p_out[i_line*i_pitch+i_col] = clip_uint8_vlc(                          p_in[i_line*i_pitch+i_col]#if 0                        + p_noise[i_line*i_pitch+i_col] );#else/* 2 rows up */              + ((  ( p_noise[(i_line-2)*i_pitch+i_col-2]<<1 )              + ( p_noise[(i_line-2)*i_pitch+i_col-1]<<2 )              + ( p_noise[(i_line-2)*i_pitch+i_col]<<2 )              + ( p_noise[(i_line-2)*i_pitch+i_col+1]<<2 )              + ( p_noise[(i_line-2)*i_pitch+i_col+2]<<1 )              /* 1 row up */              + ( p_noise[(i_line-1)*i_pitch+i_col-2]<<2 )              + ( p_noise[(i_line-1)*i_pitch+i_col-1]<<3 )              + ( p_noise[(i_line-1)*i_pitch+i_col]*12 )              + ( p_noise[(i_line-1)*i_pitch+i_col+1]<<3 )              + ( p_noise[(i_line-1)*i_pitch+i_col+2]<<2 )              /* */              + ( p_noise[i_line*i_pitch+i_col-2]<<2 )              + ( p_noise[i_line*i_pitch+i_col-1]*12 )              + ( p_noise[i_line*i_pitch+i_col]<<4 )              + ( p_noise[i_line*i_pitch+i_col+1]*12 )              + ( p_noise[i_line*i_pitch+i_col+2]<<2 )              /* 1 row down */              + ( p_noise[(i_line+1)*i_pitch+i_col-2]<<2 )              + ( p_noise[(i_line+1)*i_pitch+i_col-1]<<3 )              + ( p_noise[(i_line+1)*i_pitch+i_col]*12 )              + ( p_noise[(i_line+1)*i_pitch+i_col+1]<<3 )              + ( p_noise[(i_line+1)*i_pitch+i_col+2]<<2 )              /* 2 rows down */              + ( p_noise[(i_line+2)*i_pitch+i_col-2]<<1 )              + ( p_noise[(i_line+2)*i_pitch+i_col-1]<<2 )              + ( p_noise[(i_line+2)*i_pitch+i_col]<<2 )              + ( p_noise[(i_line+2)*i_pitch+i_col+1]<<2 )              + ( p_noise[(i_line+2)*i_pitch+i_col+2]<<1 )              )>>7/*/152*/));#endif            }            for( ; i_col < i_num_cols; i_col++ )                p_out[i_line*i_pitch+i_col] = p_in[i_line*i_pitch+i_col];        }    }    for( i_index = 1; i_index < p_pic->i_planes; i_index++ )    {        uint8_t *p_in = p_pic->p[i_index].p_pixels;        uint8_t *p_out = p_outpic->p[i_index].p_pixels;        const int i_lines = p_pic->p[i_index].i_lines;        const int i_pitch = p_pic->p[i_index].i_pitch;        vlc_memcpy( p_out, p_in, i_lines * i_pitch );    }    return CopyInfoAndRelease( p_outpic, p_pic );}