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vlc/modules/video_filter/ripple.c

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/*****************************************************************************
* ripple.c : Ripple video effect plugin for vlc
*****************************************************************************
* Copyright (C) 2000-2006 VLC authors and VideoLAN
*
* 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 Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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_filter.h>
#include <vlc_picture.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 filter", 0 )
set_category( CAT_VIDEO )
set_subcategory( SUBCAT_VIDEO_VFILTER )
add_shortcut( "ripple" )
set_callbacks( Create, Destroy )
vlc_module_end ()
/*****************************************************************************
* filter_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.
*****************************************************************************/
typedef struct
{
double f_angle;
vlc_tick_t last_date;
} filter_sys_t;
/*****************************************************************************
* 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;
const vlc_chroma_description_t *p_chroma =
vlc_fourcc_GetChromaDescription( p_filter->fmt_in.video.i_chroma );
if( p_chroma == NULL || p_chroma->plane_count == 0 )
return VLC_EGENERIC;
/* Allocate structure */
filter_sys_t *p_sys = malloc( sizeof( filter_sys_t ) );
if( p_sys == NULL )
return VLC_ENOMEM;
p_filter->p_sys = p_sys;
p_filter->pf_video_filter = Filter;
p_sys->f_angle = 0.0;
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;
double f_angle;
vlc_tick_t new_date = vlc_tick_now();
if( !p_pic ) return NULL;
p_outpic = filter_NewPicture( p_filter );
if( !p_outpic )
{
picture_Release( p_pic );
return NULL;
}
filter_sys_t *p_sys = p_filter->p_sys;
p_sys->f_angle -= 10.0f * secf_from_vlc_tick(p_sys->last_date - new_date);
p_sys->last_date = new_date;
f_angle = p_sys->f_angle;
for( int i_index = 0; i_index < p_pic->i_planes; i_index++ )
{
int i_first_line, i_visible_pitch, i_num_lines, i_offset, i_pixel_pitch,
i_visible_pixels;
uint16_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_visible_pitch = p_pic->p[i_index].i_visible_pitch;
i_pixel_pitch = p_pic->p[i_index].i_pixel_pitch;
switch( p_filter->fmt_in.video.i_chroma )
{
CASE_PLANAR_YUV10
black_pixel = ( p_pic->i_planes > 1 && i_index == Y_PLANE ) ? 0x00
: 0x200;
break;
CASE_PACKED_YUV_422
// Quick hack to fix u/v inversion occuring with 2 byte pixel pitch
i_pixel_pitch *= 2;
/* fallthrough */
CASE_PLANAR_YUV
black_pixel = ( p_pic->i_planes > 1 && i_index == Y_PLANE ) ? 0x00
: 0x80;
break;
default:
black_pixel = 0x00;
}
i_visible_pixels = i_visible_pitch/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( int i_line = 0; i_line < i_first_line; i_line++ )
{
memcpy( p_out, p_in, 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( int 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 )*i_pixel_pitch;
if( i_offset )
{
void *p_black_out;
if( i_offset < 0 )
{
memcpy( p_out, p_in - i_offset,
i_visible_pitch + i_offset );
p_black_out = &p_out[i_visible_pitch + i_offset];
i_offset = -i_offset;
}
else
{
memcpy( p_out + i_offset, p_in,
i_visible_pitch - i_offset );
p_black_out = p_out;
}
if (black_pixel > 0xFF)
{
uint16_t *p_out16 = p_black_out;
for (int x = 0; x < i_offset; x += 2)
*p_out16++ = black_pixel;
}
else
memset( p_black_out, black_pixel, i_offset );
}
else
{
memcpy( p_out, p_in, 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 );
}
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