/***************************************************************************** * ripple.c : Ripple video effect plugin for vlc ***************************************************************************** * Copyright (C) 2000-2006 the VideoLAN team * $Id$ * * Authors: Samuel Hocevar <sam@zoy.org> *          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 <math.h>                                            /* sin(), cos() */#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 * );/***************************************************************************** * Module descriptor *****************************************************************************/vlc_module_begin();    set_description( N_("Ripple video filter") );    set_shortname( N_( "Ripple" ));    set_capability( "video filter2", 0 );    set_category( CAT_VIDEO );    set_subcategory( SUBCAT_VIDEO_VFILTER );    add_shortcut( "ripple" );    set_callbacks( Create, Destroy );vlc_module_end();/***************************************************************************** * 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{    double  f_angle;    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 )        return VLC_ENOMEM;    p_filter->pf_video_filter = Filter;    p_filter->p_sys->f_angle = 0.0;    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;    int i_index;    double f_angle;    mtime_t new_date = mdate();    if( !p_pic ) return NULL;    p_outpic = filter_NewPicture( p_filter );    if( !p_outpic )    {        picture_Release( p_pic );        return NULL;    }    p_filter->p_sys->f_angle -= (p_filter->p_sys->last_date - new_date) / 100000.0;    p_filter->p_sys->last_date = new_date;    f_angle = p_filter->p_sys->f_angle;    for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )    {        int i_line, i_first_line, i_num_lines, i_offset, i_pixel_pitch,            i_visible_pixels;        uint8_t black_pixel;        uint8_t *p_in, *p_out;        black_pixel = ( p_pic->i_planes > 1 && i_index == Y_PLANE ) ? 0x00                                                                    : 0x80;        i_num_lines = p_pic->p[i_index].i_visible_lines;        i_pixel_pitch = p_pic->p[i_index].i_pixel_pitch;        i_visible_pixels = p_pic->p[i_index].i_visible_pitch/p_pic->p[i_index].i_pixel_pitch;        i_first_line = i_num_lines * 4 / 5;        p_in = p_pic->p[i_index].p_pixels;        p_out = p_outpic->p[i_index].p_pixels;        for( i_line = 0 ; i_line < i_first_line ; i_line++ )        {            vlc_memcpy( p_out, p_in, p_pic->p[i_index].i_visible_pitch );            p_in += p_pic->p[i_index].i_pitch;            p_out += p_outpic->p[i_index].i_pitch;        }        /* Ok, we do 3 times the sin() calculation for each line. So what ? */        for( i_line = i_first_line ; i_line < i_num_lines ; i_line++ )        {            /* Calculate today's offset, don't go above 1/20th of the screen */            i_offset = (int)( (double)(i_visible_pixels)                         * sin( f_angle + 2.0 * (double)i_line                                              / (double)( 1 + i_line                                                            - i_first_line) )                         * (double)(i_line - i_first_line)                         / (double)i_num_lines                         / 8.0 )*p_pic->p[i_index].i_pixel_pitch;            if( i_offset )            {                if( i_offset < 0 )                {                    vlc_memcpy( p_out, p_in - i_offset,                                p_pic->p[i_index].i_visible_pitch + i_offset );                    p_in -= p_pic->p[i_index].i_pitch;                    p_out += p_outpic->p[i_index].i_pitch;                    vlc_memset( p_out + i_offset, black_pixel, -i_offset );                }                else                {                    vlc_memcpy( p_out + i_offset, p_in,                                p_pic->p[i_index].i_visible_pitch - i_offset );                    vlc_memset( p_out, black_pixel, i_offset );                    p_in -= p_pic->p[i_index].i_pitch;                    p_out += p_outpic->p[i_index].i_pitch;                }            }            else            {                vlc_memcpy( p_out, p_in, p_pic->p[i_index].i_visible_pitch );                p_in -= p_pic->p[i_index].i_pitch;                p_out += p_outpic->p[i_index].i_pitch;            }        }    }    return CopyInfoAndRelease( p_outpic, p_pic );}