mirror of
https://code.videolan.org/videolan/vlc
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188 lines
6.5 KiB
C
188 lines
6.5 KiB
C
/*****************************************************************************
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* noise.c : "add noise to image" video filter
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*****************************************************************************
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* Copyright (C) 2000-2006 the VideoLAN team
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* $Id$
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*
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* Authors: Antoine Cellerier <dionoea -at- videolan -dot- org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#include <vlc/vlc.h>
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#include <vlc_vout.h>
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#include "vlc_filter.h"
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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static int Create ( vlc_object_t * );
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static void Destroy ( vlc_object_t * );
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static picture_t *Filter( filter_t *, picture_t * );
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#define FILTER_PREFIX "noise-"
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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vlc_module_begin();
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set_description( _("Noise video filter") );
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set_shortname( _( "Noise" ));
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set_capability( "video filter2", 0 );
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set_category( CAT_VIDEO );
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set_subcategory( SUBCAT_VIDEO_VFILTER );
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add_shortcut( "noise" );
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set_callbacks( Create, Destroy );
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vlc_module_end();
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static const char *ppsz_filter_options[] = {
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NULL
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};
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/*****************************************************************************
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* vout_sys_t: Distort video output method descriptor
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*****************************************************************************
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* This structure is part of the video output thread descriptor.
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* It describes the Distort specific properties of an output thread.
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*****************************************************************************/
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struct filter_sys_t
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{
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mtime_t last_date;
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};
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/*****************************************************************************
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* Create: allocates Distort video thread output method
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*****************************************************************************
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* This function allocates and initializes a Distort vout method.
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*****************************************************************************/
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static int Create( vlc_object_t *p_this )
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{
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filter_t *p_filter = (filter_t *)p_this;
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/* Allocate structure */
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p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
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if( p_filter->p_sys == NULL )
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{
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msg_Err( p_filter, "out of memory" );
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return VLC_ENOMEM;
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}
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config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
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p_filter->p_cfg );
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p_filter->pf_video_filter = Filter;
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p_filter->p_sys->last_date = 0;
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return VLC_SUCCESS;
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}
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/*****************************************************************************
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* Destroy: destroy Distort video thread output method
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*****************************************************************************
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* Terminate an output method created by DistortCreateOutputMethod
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*****************************************************************************/
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static void Destroy( vlc_object_t *p_this )
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{
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filter_t *p_filter = (filter_t *)p_this;
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free( p_filter->p_sys );
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}
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/*****************************************************************************
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* Render: displays previously rendered output
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*****************************************************************************
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* This function send the currently rendered image to Distort image, waits
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* until it is displayed and switch the two rendering buffers, preparing next
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* frame.
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*****************************************************************************/
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static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
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{
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picture_t *p_outpic;
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filter_sys_t *p_sys = p_filter->p_sys;
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int i_index;
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mtime_t new_date = mdate();
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if( !p_pic ) return NULL;
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p_outpic = p_filter->pf_vout_buffer_new( p_filter );
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if( !p_outpic )
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{
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msg_Warn( p_filter, "can't get output picture" );
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if( p_pic->pf_release )
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p_pic->pf_release( p_pic );
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return NULL;
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}
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p_sys->last_date = new_date;
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for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
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{
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uint8_t *p_in = p_pic->p[i_index].p_pixels;
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uint8_t *p_out = p_outpic->p[i_index].p_pixels;
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const int i_num_lines = p_pic->p[i_index].i_visible_lines;
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const int i_num_cols = p_pic->p[i_index].i_visible_pitch;
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const int i_pitch = p_pic->p[i_index].i_pitch;
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int i_line, i_col;
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for( i_line = 0 ; i_line < i_num_lines ; i_line++ )
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{
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if( rand()%8 )
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{
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/* line isn't noisy */
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p_filter->p_libvlc->pf_memcpy( p_out+i_line*i_pitch,
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p_in+i_line*i_pitch,
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i_num_cols );
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}
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else
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{
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/* this line is noisy */
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int noise_level = rand()%8+2;
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for( i_col = 0; i_col < i_num_cols ; i_col++ )
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{
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if( rand()%noise_level )
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{
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p_out[i_line*i_pitch+i_col] =
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p_in[i_line*i_pitch+i_col];
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}
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else
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{
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p_out[i_line*i_pitch+i_col] = (rand()%3)*0x7f;
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}
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}
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}
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}
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}
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p_outpic->date = p_pic->date;
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p_outpic->b_force = p_pic->b_force;
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p_outpic->i_nb_fields = p_pic->i_nb_fields;
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p_outpic->b_progressive = p_pic->b_progressive;
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p_outpic->b_top_field_first = p_pic->b_top_field_first;
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if( p_pic->pf_release )
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p_pic->pf_release( p_pic );
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return p_outpic;
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}
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