--- /dev/null
+/*****************************************************************************
+ * noise.c : "add noise to image" video filter
+ *****************************************************************************
+ * Copyright (C) 2000-2006 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
+ *****************************************************************************/
+#include <stdlib.h> /* malloc(), free() */
+#include <string.h>
+
+#include <math.h> /* sin(), cos() */
+
+#include <vlc/vlc.h>
+#include <vlc/decoder.h>
+
+#include "vlc_filter.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 "noise-"
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+vlc_module_begin();
+ set_description( _("Noise video filter") );
+ set_shortname( _( "Noise" ));
+ set_capability( "video filter2", 0 );
+ set_category( CAT_VIDEO );
+ set_subcategory( SUBCAT_VIDEO_VFILTER );
+
+ add_shortcut( "noise" );
+ set_callbacks( Create, Destroy );
+vlc_module_end();
+
+static const char *ppsz_filter_options[] = {
+ NULL
+};
+
+/*****************************************************************************
+ * vout_sys_t: Distort video output method descriptor
+ *****************************************************************************
+ * This structure is part of the video output thread descriptor.
+ * It describes the Distort specific properties of an output thread.
+ *****************************************************************************/
+struct filter_sys_t
+{
+ mtime_t last_date;
+};
+
+/*****************************************************************************
+ * Create: allocates Distort video thread output method
+ *****************************************************************************
+ * This function allocates and initializes a Distort vout method.
+ *****************************************************************************/
+static int Create( vlc_object_t *p_this )
+{
+ filter_t *p_filter = (filter_t *)p_this;
+
+ /* Allocate structure */
+ p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
+ if( p_filter->p_sys == NULL )
+ {
+ msg_Err( p_filter, "out of memory" );
+ return VLC_ENOMEM;
+ }
+
+ config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
+ p_filter->p_cfg );
+
+ p_filter->pf_video_filter = Filter;
+
+ p_filter->p_sys->last_date = 0;
+
+ return VLC_SUCCESS;
+}
+
+/*****************************************************************************
+ * Destroy: destroy Distort video thread output method
+ *****************************************************************************
+ * Terminate an output method created by DistortCreateOutputMethod
+ *****************************************************************************/
+static void Destroy( vlc_object_t *p_this )
+{
+ filter_t *p_filter = (filter_t *)p_this;
+ free( p_filter->p_sys );
+}
+
+/*****************************************************************************
+ * Render: displays previously rendered output
+ *****************************************************************************
+ * This function send the currently rendered image to Distort image, waits
+ * until it is displayed and switch the two rendering buffers, preparing next
+ * frame.
+ *****************************************************************************/
+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;
+ mtime_t new_date = mdate();
+
+ if( !p_pic ) return NULL;
+
+ p_outpic = p_filter->pf_vout_buffer_new( p_filter );
+ if( !p_outpic )
+ {
+ msg_Warn( p_filter, "can't get output picture" );
+ if( p_pic->pf_release )
+ p_pic->pf_release( p_pic );
+ return NULL;
+ }
+
+ p_sys->last_date = new_date;
+
+ for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
+ {
+ int i_line, i_num_lines, i_col, i_num_cols;
+ uint8_t black_pixel;
+ uint8_t *p_in, *p_out;
+
+ p_in = p_pic->p[i_index].p_pixels;
+ p_out = p_outpic->p[i_index].p_pixels;
+
+ i_num_lines = p_pic->p[i_index].i_visible_lines;
+ i_num_cols = p_pic->p[i_index].i_visible_pitch;
+
+ for( i_line = 0 ; i_line < i_num_lines ; i_line++ )
+ {
+ if( rand()%8 )
+ {
+ /* line isn't noisy */
+ p_filter->p_libvlc->pf_memcpy( p_out+i_line*i_num_cols,
+ p_in+i_line*i_num_cols,
+ i_num_cols );
+ }
+ else
+ {
+ /* this line is noisy */
+ int noise_level = rand()%8+2;
+ for( i_col = 0; i_col < i_num_cols ; i_col++ )
+ {
+ if( rand()%noise_level )
+ {
+ p_out[i_line*i_num_cols+i_col] =
+ p_in[i_line*i_num_cols+i_col];
+ }
+ else
+ {
+ p_out[i_line*i_num_cols+i_col] = (rand()%3)*0x7f;
+ }
+ }
+ }
+ }
+ }
+
+ p_outpic->date = p_pic->date;
+ p_outpic->b_force = p_pic->b_force;
+ p_outpic->i_nb_fields = p_pic->i_nb_fields;
+ p_outpic->b_progressive = p_pic->b_progressive;
+ p_outpic->b_top_field_first = p_pic->b_top_field_first;
+
+ if( p_pic->pf_release )
+ p_pic->pf_release( p_pic );
+
+ return p_outpic;
+}
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