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vlc/modules/video_filter/distort.c

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/*****************************************************************************
* distort.c : Misc video effects plugin for vlc
*****************************************************************************
* Copyright (C) 2000, 2001, 2002, 2003 VideoLAN
* $Id: distort.c,v 1.9 2003/03/30 18:14:38 gbazin Exp $
*
* Authors: Samuel Hocevar <sam@zoy.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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#include <stdlib.h> /* malloc(), free() */
#include <string.h>
#include <math.h> /* sin(), cos() */
#include <vlc/vlc.h>
#include <vlc/vout.h>
#include "filter_common.h"
#define DISTORT_MODE_WAVE 1
#define DISTORT_MODE_RIPPLE 2
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int Create ( vlc_object_t * );
static void Destroy ( vlc_object_t * );
static int Init ( vout_thread_t * );
static void End ( vout_thread_t * );
static void Render ( vout_thread_t *, picture_t * );
static void DistortWave ( vout_thread_t *, picture_t *, picture_t * );
static void DistortRipple ( vout_thread_t *, picture_t *, picture_t * );
static int SendEvents ( vlc_object_t *, char const *,
vlc_value_t, vlc_value_t, void * );
/*****************************************************************************
* Module descriptor
*****************************************************************************/
#define MODE_TEXT N_("distort mode")
#define MODE_LONGTEXT N_("Distort mode, one of \"wave\" and \"ripple\"")
static char *mode_list[] = { "wave", "ripple", NULL };
vlc_module_begin();
add_category_hint( N_("Distort"), NULL, VLC_FALSE );
add_string_from_list( "distort-mode", "wave", mode_list, NULL,
MODE_TEXT, MODE_LONGTEXT, VLC_FALSE );
set_description( _("miscellaneous distort video effects filter") );
set_capability( "video filter", 0 );
add_shortcut( "distort" );
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 vout_sys_t
{
int i_mode;
vout_thread_t *p_vout;
/* For the wave mode */
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 )
{
vout_thread_t *p_vout = (vout_thread_t *)p_this;
char *psz_method, *psz_method_tmp;
/* Allocate structure */
p_vout->p_sys = malloc( sizeof( vout_sys_t ) );
if( p_vout->p_sys == NULL )
{
msg_Err( p_vout, "out of memory" );
return VLC_ENOMEM;
}
p_vout->pf_init = Init;
p_vout->pf_end = End;
p_vout->pf_manage = NULL;
p_vout->pf_render = Render;
p_vout->pf_display = NULL;
p_vout->p_sys->i_mode = 0;
/* Look what method was requested from command line*/
if( !(psz_method = psz_method_tmp = config_GetPsz( p_vout, "filter" )) )
{
msg_Err( p_vout, "configuration variable %s empty", "filter" );
return VLC_EGENERIC;
}
while( *psz_method && *psz_method != ':' )
{
psz_method++;
}
if( !strcmp( psz_method, ":wave" ) )
{
p_vout->p_sys->i_mode = DISTORT_MODE_WAVE;
}
else if( !strcmp( psz_method, ":ripple" ) )
{
p_vout->p_sys->i_mode = DISTORT_MODE_RIPPLE;
}
free( psz_method_tmp );
if( !p_vout->p_sys->i_mode )
{
/* No method given in commandline. Look what method was
requested in configuration system */
if( !(psz_method = psz_method_tmp
= config_GetPsz( p_vout, "distort-mode" )) )
{
msg_Err( p_vout, "configuration variable %s empty, using 'wave'",
"distort-mode" );
p_vout->p_sys->i_mode = DISTORT_MODE_WAVE;
}
else {
if( !strcmp( psz_method, "wave" ) )
{
p_vout->p_sys->i_mode = DISTORT_MODE_WAVE;
}
else if( !strcmp( psz_method, "ripple" ) )
{
p_vout->p_sys->i_mode = DISTORT_MODE_RIPPLE;
}
else
{
msg_Err( p_vout, "no valid distort mode provided, "
"using wave" );
p_vout->p_sys->i_mode = DISTORT_MODE_WAVE;
}
}
}
free( psz_method_tmp );
return VLC_SUCCESS;
}
/*****************************************************************************
* Init: initialize Distort video thread output method
*****************************************************************************/
static int Init( vout_thread_t *p_vout )
{
int i_index;
picture_t *p_pic;
I_OUTPUTPICTURES = 0;
/* Initialize the output structure */
p_vout->output.i_chroma = p_vout->render.i_chroma;
p_vout->output.i_width = p_vout->render.i_width;
p_vout->output.i_height = p_vout->render.i_height;
p_vout->output.i_aspect = p_vout->render.i_aspect;
/* Try to open the real video output */
msg_Dbg( p_vout, "spawning the real video output" );
p_vout->p_sys->p_vout = vout_Create( p_vout,
p_vout->render.i_width, p_vout->render.i_height,
p_vout->render.i_chroma, p_vout->render.i_aspect );
/* Everything failed */
if( p_vout->p_sys->p_vout == NULL )
{
msg_Err( p_vout, "cannot open vout, aborting" );
return VLC_EGENERIC;
}
ALLOCATE_DIRECTBUFFERS( VOUT_MAX_PICTURES );
ADD_CALLBACKS( p_vout->p_sys->p_vout, SendEvents );
p_vout->p_sys->f_angle = 0.0;
p_vout->p_sys->last_date = 0;
return VLC_SUCCESS;
}
/*****************************************************************************
* End: terminate Distort video thread output method
*****************************************************************************/
static void End( vout_thread_t *p_vout )
{
int i_index;
/* Free the fake output buffers we allocated */
for( i_index = I_OUTPUTPICTURES ; i_index ; )
{
i_index--;
free( PP_OUTPUTPICTURE[ i_index ]->p_data_orig );
}
}
/*****************************************************************************
* Destroy: destroy Distort video thread output method
*****************************************************************************
* Terminate an output method created by DistortCreateOutputMethod
*****************************************************************************/
static void Destroy( vlc_object_t *p_this )
{
vout_thread_t *p_vout = (vout_thread_t *)p_this;
DEL_CALLBACKS( p_vout->p_sys->p_vout, SendEvents );
vlc_object_detach( p_vout->p_sys->p_vout );
vout_Destroy( p_vout->p_sys->p_vout );
free( p_vout->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 void Render( vout_thread_t *p_vout, picture_t *p_pic )
{
picture_t *p_outpic;
/* This is a new frame. Get a structure from the video_output. */
while( ( p_outpic = vout_CreatePicture( p_vout->p_sys->p_vout, 0, 0, 0 ) )
== NULL )
{
if( p_vout->b_die || p_vout->b_error )
{
return;
}
msleep( VOUT_OUTMEM_SLEEP );
}
vout_DatePicture( p_vout->p_sys->p_vout, p_outpic, p_pic->date );
switch( p_vout->p_sys->i_mode )
{
case DISTORT_MODE_WAVE:
DistortWave( p_vout, p_pic, p_outpic );
break;
case DISTORT_MODE_RIPPLE:
DistortRipple( p_vout, p_pic, p_outpic );
break;
default:
break;
}
vout_DisplayPicture( p_vout->p_sys->p_vout, p_outpic );
}
/*****************************************************************************
* DistortWave: draw a wave effect on the picture
*****************************************************************************/
static void DistortWave( vout_thread_t *p_vout, picture_t *p_inpic,
picture_t *p_outpic )
{
int i_index;
double f_angle;
mtime_t new_date = mdate();
p_vout->p_sys->f_angle += (new_date - p_vout->p_sys->last_date) / 200000.0;
p_vout->p_sys->last_date = new_date;
f_angle = p_vout->p_sys->f_angle;
for( i_index = 0 ; i_index < p_inpic->i_planes ; i_index++ )
{
int i_line, i_num_lines, i_offset;
uint8_t black_pixel;
uint8_t *p_in, *p_out;
p_in = p_inpic->p[i_index].p_pixels;
p_out = p_outpic->p[i_index].p_pixels;
i_num_lines = p_inpic->p[i_index].i_lines;
black_pixel = ( i_index == Y_PLANE ) ? 0x00 : 0x80;
/* Ok, we do 3 times the sin() calculation for each line. So what ? */
for( i_line = 0 ; i_line < i_num_lines ; i_line++ )
{
/* Calculate today's offset, don't go above 1/20th of the screen */
i_offset = (int)( (double)(p_inpic->p[i_index].i_visible_pitch)
* sin( f_angle + 10.0 * (double)i_line
/ (double)i_num_lines )
/ 20.0 );
if( i_offset )
{
if( i_offset < 0 )
{
p_vout->p_vlc->pf_memcpy( p_out, p_in - i_offset,
p_inpic->p[i_index].i_visible_pitch + i_offset );
p_in += p_inpic->p[i_index].i_pitch;
p_out += p_outpic->p[i_index].i_pitch;
memset( p_out + i_offset, black_pixel, -i_offset );
}
else
{
p_vout->p_vlc->pf_memcpy( p_out + i_offset, p_in,
p_inpic->p[i_index].i_visible_pitch - i_offset );
memset( p_out, black_pixel, i_offset );
p_in += p_inpic->p[i_index].i_pitch;
p_out += p_outpic->p[i_index].i_pitch;
}
}
else
{
p_vout->p_vlc->pf_memcpy( p_out, p_in,
p_inpic->p[i_index].i_visible_pitch );
p_in += p_inpic->p[i_index].i_pitch;
p_out += p_outpic->p[i_index].i_pitch;
}
}
}
}
/*****************************************************************************
* DistortRipple: draw a ripple effect at the bottom of the picture
*****************************************************************************/
static void DistortRipple( vout_thread_t *p_vout, picture_t *p_inpic,
picture_t *p_outpic )
{
int i_index;
double f_angle;
mtime_t new_date = mdate();
p_vout->p_sys->f_angle -= (p_vout->p_sys->last_date - new_date) / 100000.0;
p_vout->p_sys->last_date = new_date;
f_angle = p_vout->p_sys->f_angle;
for( i_index = 0 ; i_index < p_inpic->i_planes ; i_index++ )
{
int i_line, i_first_line, i_num_lines, i_offset;
uint8_t black_pixel;
uint8_t *p_in, *p_out;
black_pixel = ( i_index == Y_PLANE ) ? 0x00 : 0x80;
i_num_lines = p_inpic->p[i_index].i_lines;
i_first_line = i_num_lines * 4 / 5;
p_in = p_inpic->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++ )
{
p_vout->p_vlc->pf_memcpy( p_out, p_in,
p_inpic->p[i_index].i_visible_pitch );
p_in += p_inpic->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)(p_inpic->p[i_index].i_pitch)
* 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 );
if( i_offset )
{
if( i_offset < 0 )
{
p_vout->p_vlc->pf_memcpy( p_out, p_in - i_offset,
p_inpic->p[i_index].i_visible_pitch + i_offset );
p_in -= p_inpic->p[i_index].i_pitch;
p_out += p_outpic->p[i_index].i_pitch;
memset( p_out + i_offset, black_pixel, -i_offset );
}
else
{
p_vout->p_vlc->pf_memcpy( p_out + i_offset, p_in,
p_inpic->p[i_index].i_visible_pitch - i_offset );
memset( p_out, black_pixel, i_offset );
p_in -= p_inpic->p[i_index].i_pitch;
p_out += p_outpic->p[i_index].i_pitch;
}
}
else
{
p_vout->p_vlc->pf_memcpy( p_out, p_in,
p_inpic->p[i_index].i_visible_pitch );
p_in -= p_inpic->p[i_index].i_pitch;
p_out += p_outpic->p[i_index].i_pitch;
}
}
}
}
/*****************************************************************************
* SendEvents: forward mouse and keyboard events to the parent p_vout
*****************************************************************************/
static int SendEvents( vlc_object_t *p_this, char const *psz_var,
vlc_value_t oldval, vlc_value_t newval, void *p_data )
{
var_Set( (vlc_object_t *)p_data, psz_var, newval );
return VLC_SUCCESS;
}
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