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vlc/modules/video_filter/mirror.c

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/*****************************************************************************
* mirror.c : Mirror video plugin for vlc
*****************************************************************************
* Copyright (C) 2009 VLC authors and VideoLAN
*
* Authors: Branko Kokanovic <branko.kokanovic@gmail.com>
*
* 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 <assert.h>
#include <stdatomic.h>
#include <vlc_common.h>
#include <vlc_configuration.h>
#include <vlc_plugin.h>
#include <vlc_filter.h>
#include <vlc_picture.h>
#include "filter_picture.h"
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int Create ( filter_t * );
static void VerticalMirror( picture_t *, picture_t *, int plane, bool );
static void HorizontalMirror( picture_t *, picture_t *, int, bool );
static void PlanarVerticalMirror( picture_t *, picture_t *, int plane, bool );
static void YUV422VerticalMirror( picture_t *, picture_t *, int plane, bool, bool );
static void RV24VerticalMirror( picture_t *, picture_t *, int plane, bool );
static void RV32VerticalMirror( picture_t *, picture_t *, int plane, bool );
static void YUV422Mirror2Pixels( uint8_t *, uint8_t *, bool );
VIDEO_FILTER_WRAPPER_CLOSE(Filter, Destroy)
static const char *const ppsz_filter_options[] = {
"split", "direction", NULL
};
/*****************************************************************************
* Module descriptor
*****************************************************************************/
#define ORIENTATION_TEXT N_("Mirror orientation")
#define ORIENTATION_LONGTEXT N_("Defines orientation of the mirror splitting. " \
"Can be vertical or horizontal." )
static const int pi_orientation_values[] = { 0, 1 };
static const char *const ppsz_orientation_descriptions[] = {
N_("Vertical"), N_("Horizontal") };
#define DIRECTION_TEXT N_("Direction")
#define DIRECTION_LONGTEXT N_("Direction of the mirroring." )
static const int pi_direction_values[] = { 0, 1 };
static const char *const ppsz_direction_descriptions[] = {
N_("Left to right/Top to bottom"), N_("Right to left/Bottom to top") };
#define CFG_PREFIX "mirror-"
vlc_module_begin ()
set_description( N_("Mirror video filter") )
set_shortname( N_("Mirror video" ))
set_help( N_("Splits video in two same parts, like in a mirror") )
set_subcategory( SUBCAT_VIDEO_VFILTER )
add_integer( CFG_PREFIX "split", 0, ORIENTATION_TEXT,
ORIENTATION_LONGTEXT )
change_integer_list( pi_orientation_values,
ppsz_orientation_descriptions )
add_integer( CFG_PREFIX "direction", 0, DIRECTION_TEXT,
DIRECTION_LONGTEXT )
change_integer_list( pi_direction_values, ppsz_direction_descriptions )
set_callback_video_filter( Create )
vlc_module_end ()
/*****************************************************************************
* callback prototypes
*****************************************************************************/
static int FilterCallback( vlc_object_t *, char const *,
vlc_value_t, vlc_value_t, void * );
/*****************************************************************************
* filter_sys_t: adjust filter method descriptor
*****************************************************************************/
typedef struct
{
atomic_int i_split;
atomic_int i_direction;
} filter_sys_t;
/*****************************************************************************
* Create: allocates Mirror video thread output method
*****************************************************************************
* This function allocates and initializes a Mirror vout method.
*****************************************************************************/
static int Create( filter_t *p_filter )
{
filter_sys_t *p_sys;
switch( p_filter->fmt_in.video.i_chroma )
{
CASE_PLANAR_YUV_SQUARE
break;
CASE_PACKED_YUV_422
break;
CASE_PACKED_RGB32
break;
case VLC_CODEC_RGB24:
case VLC_CODEC_BGR24:
break;
default:
msg_Err( p_filter, "Unsupported input chroma (%4.4s)",
(char*)&(p_filter->fmt_in.video.i_chroma) );
return VLC_EGENERIC;
}
if( !video_format_IsSameChroma( &p_filter->fmt_in.video,
&p_filter->fmt_out.video ) )
{
msg_Err( p_filter, "Input and output chromas don't match" );
return VLC_EGENERIC;
}
/* Allocate structure */
p_sys = p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
if( p_filter->p_sys == NULL )
return VLC_ENOMEM;
config_ChainParse( p_filter, CFG_PREFIX, ppsz_filter_options,
p_filter->p_cfg );
atomic_init( &p_sys->i_split,
var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "split" ) );
atomic_init( &p_sys->i_direction,
var_CreateGetIntegerCommand( p_filter,
CFG_PREFIX "direction" ) );
var_AddCallback( p_filter, CFG_PREFIX "split", FilterCallback, p_sys );
var_AddCallback( p_filter, CFG_PREFIX "direction", FilterCallback, p_sys );
p_filter->ops = &Filter_ops;
return VLC_SUCCESS;
}
/*****************************************************************************
* Destroy: destroy Mirror video thread output method
*****************************************************************************
* Terminate an output method created by MirrorCreateOutputMethod
*****************************************************************************/
static void Destroy( filter_t *p_filter )
{
filter_sys_t *p_sys = p_filter->p_sys;
var_DelCallback( p_filter, CFG_PREFIX "split", FilterCallback, p_sys );
var_DelCallback( p_filter, CFG_PREFIX "direction", FilterCallback, p_sys );
free( p_sys );
}
/*****************************************************************************
* Render: displays previously rendered output
*****************************************************************************
* This function send the currently rendered image to Mirror image, waits
* until it is displayed and switch the two rendering buffers, preparing next
* frame.
*****************************************************************************/
static void Filter( filter_t *p_filter, picture_t *p_pic, picture_t *p_outpic )
{
bool b_vertical_split, b_left_to_right;
filter_sys_t *p_sys = p_filter->p_sys;
b_vertical_split = !atomic_load( &p_sys->i_split );
b_left_to_right = !atomic_load( &p_sys->i_direction );
for( int i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
{
if ( b_vertical_split )
VerticalMirror( p_pic, p_outpic, i_index, b_left_to_right );
else
HorizontalMirror( p_pic, p_outpic, i_index, b_left_to_right );
}
}
/*****************************************************************************
* VerticalMirror: Mirrors vertically image
*****************************************************************************
* This function is a simple delegate to concrete function for vertical
* mirroring depending on the input format.
*****************************************************************************/
static void VerticalMirror( picture_t *p_pic, picture_t *p_outpic, int i_plane,
bool b_left_to_right )
{
switch( p_pic->format.i_chroma )
{
CASE_PLANAR_YUV_SQUARE
PlanarVerticalMirror( p_pic, p_outpic, i_plane, b_left_to_right );
break;
case VLC_CODEC_YUYV:
case VLC_CODEC_YVYU:
YUV422VerticalMirror( p_pic, p_outpic, i_plane, b_left_to_right,
true );
break;
case VLC_CODEC_UYVY:
break;
case VLC_CODEC_RGB24:
case VLC_CODEC_BGR24:
RV24VerticalMirror( p_pic, p_outpic, i_plane, b_left_to_right );
break;
CASE_PACKED_RGB32
RV32VerticalMirror( p_pic, p_outpic, i_plane, b_left_to_right );
break;
default:
vlc_assert_unreachable();
}
}
/*****************************************************************************
* PlanarVerticalMirror: Mirrors vertically image byte by byte
*****************************************************************************
* This function mirrors image vertically. It iterates for all lines in
* image and for every line, it mirrors byte for byte if needed.
* This function works for planar formats only.
*****************************************************************************/
static void PlanarVerticalMirror( picture_t *p_pic, picture_t *p_outpic,
int i_plane, bool b_left_to_right )
{
uint8_t *p_in, *p_in_end, *p_line_start, *p_line_end, *p_out;
p_in = p_pic->p[i_plane].p_pixels;
p_in_end = p_in + p_pic->p[i_plane].i_visible_lines
* p_pic->p[i_plane].i_pitch;
p_out = p_outpic->p[i_plane].p_pixels;
while( p_in < p_in_end ) {
p_line_start = p_in;
p_line_end = p_in + p_pic->p[i_plane].i_visible_pitch;
while( p_in < p_line_end )
{
/* are we in the left part of the line */
if ( p_in < p_line_start + ( p_line_end - p_line_start ) / 2 )
{
if ( b_left_to_right )
*p_out = *p_in;
else
*p_out = *( p_line_end - ( p_in - p_line_start ) );
}
else
{
if ( b_left_to_right )
*p_out = *( p_line_start + ( p_line_end - p_in ) );
else
*p_out = *p_in;
}
p_in++;
p_out++;
}
p_in += p_pic->p[i_plane].i_pitch - p_pic->p[i_plane].i_visible_pitch;
p_out += p_outpic->p[i_plane].i_pitch
- p_outpic->p[i_plane].i_visible_pitch;
}
}
/*****************************************************************************
* YUV422VerticalMirror: Mirrors vertically image byte by byte for YUV422 format
*****************************************************************************
* This function mirrors image vertically. It iterates for all lines in
* image and for every line, iterates for 4-byte chucks, properly mirroring
* them vertically (swapping Y components and keeping Cb and Cr components).
* This function works only for YUV422 packed formats.
*****************************************************************************/
static void YUV422VerticalMirror( picture_t *p_pic, picture_t *p_outpic,
int i_plane, bool b_left_to_right,
bool b_y_is_odd )
{
uint8_t *p_in, *p_in_end, *p_line_start, *p_line_end, *p_out;
p_in = p_pic->p[i_plane].p_pixels;
p_in_end = p_in + p_pic->p[i_plane].i_visible_lines
* p_pic->p[i_plane].i_pitch;
p_out = p_outpic->p[i_plane].p_pixels;
while( p_in < p_in_end )
{
p_line_start = p_in;
p_line_end = p_in + p_pic->p[i_plane].i_visible_pitch;
while( p_in < p_line_end )
{
/* are we in the left part of the line */
if ( p_in < p_line_start + ( p_line_end - p_line_start ) / 2 )
{
if ( b_left_to_right )
{
*p_out++ = *p_in++;
*p_out++ = *p_in++;
*p_out++ = *p_in++;
*p_out++ = *p_in++;
}
else
{
uint8_t *p_start = p_line_end - ( p_in - p_line_start );
YUV422Mirror2Pixels( p_out, p_start, b_y_is_odd );
p_in += 4;
p_out += 4;
}
}
else
{
if ( b_left_to_right )
{
uint8_t *p_start = p_line_end - ( p_in - p_line_start );
YUV422Mirror2Pixels( p_out, p_start, b_y_is_odd );
p_in += 4;
p_out += 4;
}
else
{
*p_out++ = *p_in++;
*p_out++ = *p_in++;
*p_out++ = *p_in++;
*p_out++ = *p_in++;
}
}
}
p_in += p_pic->p[i_plane].i_pitch - p_pic->p[i_plane].i_visible_pitch;
p_out += p_outpic->p[i_plane].i_pitch
- p_outpic->p[i_plane].i_visible_pitch;
}
}
/*****************************************************************************
* YUV422Mirror2Pixels: Mirrors 2 consecutive pixels
*****************************************************************************
* This function mirrors two consecutive pixels of 4 byte size. Depending of
* position of Y components (b_y_is_odd is true if Y components are first and
* third (like in YUYV or YVYU), they are properly swapped, and Cb and Cr
* component positions are preserved.
*****************************************************************************/
static void YUV422Mirror2Pixels( uint8_t* p_dst, uint8_t *p_src,
bool b_y_is_odd )
{
if ( b_y_is_odd )
{
/* swap Y components */
*p_dst = *( p_src + 2 );
*( p_dst + 2 ) = *p_src;
/* copy Cb and Cr components */
*( p_dst + 1 ) = *( p_src + 1 );
*( p_dst + 3 ) = *( p_src + 3 );
}
else{
/* swap Y components */
*( p_dst + 1 )= *( p_src + 3 );
*( p_dst + 3 ) = *( p_src + 1);
/* copy Cb and Cr components */
*p_dst = *( p_src + 2 );
*( p_dst + 2 ) = *p_src;
}
}
/*****************************************************************************
* RV24VerticalMirror: Mirrors vertically image byte by byte for RV24 format
*****************************************************************************
* This function mirrors image vertically. It iterates for all lines in
* image and for every line, it iterates for 3-byte chunks.
* This function works only for RV24 formats.
*****************************************************************************/
static void RV24VerticalMirror( picture_t *p_pic, picture_t *p_outpic,
int i_plane, bool b_left_to_right )
{
uint8_t *p_in, *p_in_end, *p_line_start, *p_line_end, *p_out;
p_in = p_pic->p[i_plane].p_pixels;
p_in_end = p_in + p_pic->p[i_plane].i_visible_lines
* p_pic->p[i_plane].i_pitch;
p_out = p_outpic->p[i_plane].p_pixels;
while( p_in < p_in_end )
{
p_line_start = p_in;
p_line_end = p_in + p_pic->p[i_plane].i_visible_pitch;
while( p_in < p_line_end )
{
/* are we in the left part of the line */
if ( p_in < p_line_start + ( p_line_end - p_line_start ) / 2 )
{
if ( b_left_to_right )
{
*p_out++ = *p_in++;
*p_out++ = *p_in++;
*p_out++ = *p_in++;
}
else
{
uint8_t *p_pixel = p_line_end - ( p_in - p_line_start );
p_in += 3;
*p_out++ = *p_pixel++;
*p_out++ = *p_pixel++;
*p_out++ = *p_pixel++;
}
}
else
{
if ( b_left_to_right )
{
uint8_t *p_pixel = p_line_end - ( p_in - p_line_start );
p_in += 3;
*p_out++ = *p_pixel++;
*p_out++ = *p_pixel++;
*p_out++ = *p_pixel++;
}
else
{
*p_out++ = *p_in++;
*p_out++ = *p_in++;
*p_out++ = *p_in++;
}
}
}
p_in += p_pic->p[i_plane].i_pitch - p_pic->p[i_plane].i_visible_pitch;
p_out += p_outpic->p[i_plane].i_pitch
- p_outpic->p[i_plane].i_visible_pitch;
}
}
/*****************************************************************************
* RV32VerticalMirror: Mirrors vertically image byte by byte for RV32 format
*****************************************************************************
* This function mirrors image vertically. It iterates for all lines in
* image and for every line, it iterates for 4-byte chunks as 32-bit pointers.
* This function works only for RV32 formats.
*****************************************************************************/
static void RV32VerticalMirror( picture_t *p_pic, picture_t *p_outpic,
int i_plane, bool b_left_to_right )
{
uint8_t *p_in, *p_in_end, *p_out;
p_in = p_pic->p[i_plane].p_pixels;
p_in_end = p_in + p_pic->p[i_plane].i_visible_lines
* p_pic->p[i_plane].i_pitch;
p_out = p_outpic->p[i_plane].p_pixels;
while( p_in < p_in_end )
{
uint32_t *p_in32, *p_out32, *p_line_start32, *p_line_end32;
p_in32 = (uint32_t*) p_in;
p_out32 = (uint32_t*) p_out;
p_line_start32 = p_in32;
p_line_end32 = (uint32_t*) ( p_in + p_pic->p[i_plane].i_visible_pitch) ;
while( p_in32 < p_line_end32 )
{
/* are we in the left part of the line */
if ( p_in32 < p_line_start32 + ( p_line_end32 - p_line_start32 ) / 2 )
{
if ( b_left_to_right )
{
*p_out32++ = *p_in32++;
}
else
{
uint32_t *p_pixel32 = p_line_end32 - ( p_in32 - p_line_start32 );
p_in32++;
*p_out++ = *p_pixel32;
}
}
else
{
if ( b_left_to_right )
{
uint32_t *p_pixel32 = p_line_end32 - ( p_in32 - p_line_start32 );
p_in32++;
*p_out++ = *p_pixel32;
}
else
{
*p_out32++ = *p_in32++;
}
}
}
p_in = (uint8_t*) p_in32;
p_out = (uint8_t*) p_out32;
p_in += p_pic->p[i_plane].i_pitch - p_pic->p[i_plane].i_visible_pitch;
p_out += p_outpic->p[i_plane].i_pitch
- p_outpic->p[i_plane].i_visible_pitch;
}
}
/*****************************************************************************
* HorizontalMirror: Mirrors horizontally image byte by byte
*****************************************************************************
* This function mirrors image horizontally. It iterates for all lines in
* image and for every line, determines if it should be copied, and if it does,
* finds opposite line in picture and copies current byte from opposite line.
* This function works both for planar, packed and RV24 formats.
*****************************************************************************/
static void HorizontalMirror( picture_t *p_pic, picture_t *p_outpic, int i_plane,
bool b_top_to_bottom )
{
uint8_t *p_in, *p_in_end, *p_line_start, *p_line_end, *p_out;
int i_curr_line = 0;
int i_max_lines = p_pic->p[i_plane].i_visible_lines;
p_in = p_pic->p[i_plane].p_pixels;
p_in_end = p_in + p_pic->p[i_plane].i_visible_lines
* p_pic->p[i_plane].i_pitch;
p_out = p_outpic->p[i_plane].p_pixels;
while( p_in < p_in_end )
{
p_line_start = p_in;
p_line_end = p_in + p_pic->p[i_plane].i_visible_pitch;
while( p_in < p_line_end )
{
uint8_t *p_inverse_line;
/* are we in the upper part of the picture */
if ( i_curr_line < i_max_lines/2 )
{
if ( b_top_to_bottom )
{
*p_out = *p_in;
}
else
{
/* determines line inverse to current line */
p_inverse_line = p_pic->p[i_plane].p_pixels +
( i_max_lines - i_curr_line - 1 ) * p_pic->p[i_plane].i_pitch;
*p_out = *( p_inverse_line + ( p_in - p_line_start ) );
}
}
else
{
if ( b_top_to_bottom )
{
/* determines line inverse to current line */
p_inverse_line = p_pic->p[i_plane].p_pixels +
( i_max_lines - i_curr_line - 1 ) * p_pic->p[i_plane].i_pitch;
*p_out = *( p_inverse_line + ( p_in - p_line_start ) );
}
else
{
*p_out = *p_in;
}
}
p_in++;
p_out++;
}
i_curr_line++;
p_in += p_pic->p[i_plane].i_pitch - p_pic->p[i_plane].i_visible_pitch;
p_out += p_outpic->p[i_plane].i_pitch
- p_outpic->p[i_plane].i_visible_pitch;
}
}
static int FilterCallback ( vlc_object_t *p_this, char const *psz_var,
vlc_value_t oldval, vlc_value_t newval, void *p_data )
{
(void) p_this; (void)oldval;
filter_sys_t *p_sys = p_data;
if( !strcmp( psz_var, CFG_PREFIX "split" ) )
atomic_store( &p_sys->i_split, newval.i_int );
else /* CFG_PREFIX "direction" */
atomic_store( &p_sys->i_direction, newval.i_int );
return VLC_SUCCESS;
}
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