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Sepia video filter 

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>
This commit is contained in:
Branko Kokanovic 2010-11-15 20:20:14 +01:00 committed by Rémi Denis-Courmont
parent 2e1b9e4471
commit 5907d722c9
5 changed files with 548 additions and 0 deletions
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1
NEWS
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@ -56,6 +56,7 @@ Video Filter:
* Rewrite of the grain filter, faster and with better quality
* New posterize filter for lowering the number of colors
* Atmo ambilight: improve Fnordlicht up to 254 channels
* New sepia filter for creating sepia effect in videos
Audio Output:
* New audio output based on AudioQueue API for iOS

1
modules/LIST
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@ -267,6 +267,7 @@ $Id$
* schroedinger: Schroedinger video decoder
* screen: a input module that takes screenshots of the primary monitor
* sdl_image: SDL-based image decoder
* sepia: Sepia video filter
* sharpen: Sharpen video filter
* shine: MP3 encoder using Shine, a fixed point implementation
* simple_channel_mixer: channel mixer

2
modules/video_filter/Modules.am
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@ -52,6 +52,7 @@ SOURCES_swscale_omap = swscale_omap.c \
libswscale_nokia770/arm_jit_swscale.h \
libswscale_nokia770/arm_colorconv.h
SOURCES_scene = scene.c
SOURCES_sepia = sepia.c
SOURCES_yuvp = yuvp.c
SOURCES_atmo = atmo/atmo.cpp \
atmo/AtmoDefs.h \
@ -114,6 +115,7 @@ libvlc_LTLIBRARIES += \
librv32_plugin.la \
libscale_plugin.la \
libscene_plugin.la \
libsepia_plugin.la \
libsharpen_plugin.la \
libtransform_plugin.la \
libwall_plugin.la \

543
modules/video_filter/sepia.c Normal file
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@ -0,0 +1,543 @@
/*****************************************************************************
* sepia.c : Sepia video plugin for vlc
*****************************************************************************
* Copyright (C) 2010 the VideoLAN team
* $Id$
*
* 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 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 <vlc_common.h>
#include <vlc_plugin.h>
#include <assert.h>
#include <vlc_filter.h>
#include "filter_picture.h"
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int Create ( vlc_object_t * );
static void Destroy ( vlc_object_t * );
static void vlc_rgb_index( int *, int *, int *, const video_format_t * );
static void vlc_yuv_index( int *, int *, int *, const video_format_t * );
static void RVSepia( picture_t *, picture_t *, int );
static void PlanarI420Sepia( picture_t *, picture_t *, int);
static void PackedYUVSepia( picture_t *, picture_t *, int);
static void YuvSepia2( uint8_t *, uint8_t *, uint8_t *, uint8_t *,
const uint8_t, const uint8_t, const uint8_t, const uint8_t,
int );
static void YuvSepia4( uint8_t *, uint8_t *, uint8_t *, uint8_t *, uint8_t *,
uint8_t *, const uint8_t, const uint8_t, const uint8_t,
const uint8_t, const uint8_t, const uint8_t, int );
static void Sepia( int *, int *, int *, int );
static picture_t *Filter( filter_t *, picture_t * );
static const char *const ppsz_filter_options[] = {
"intensity", NULL
};
/*****************************************************************************
* Module descriptor
*****************************************************************************/
#define SEPIA_INTENSITY_TEXT N_("Sepia intensity")
#define SEPIA_INTENSITY_LONGTEXT N_("Intensity of sepia effect" )
#define CFG_PREFIX "sepia-"
vlc_module_begin ()
set_description( N_("Sepia video filter") )
set_shortname( N_("Sepia" ) )
set_help( N_("Gives video a warmer tone by applying sepia effect") )
set_category( CAT_VIDEO )
set_subcategory( SUBCAT_VIDEO_VFILTER )
set_capability( "video filter2", 0 )
add_integer_with_range( CFG_PREFIX "intensity", 30, 0, 255, NULL,
SEPIA_INTENSITY_TEXT, SEPIA_INTENSITY_LONGTEXT,
false )
set_callbacks( Create, Destroy )
vlc_module_end ()
/*****************************************************************************
* callback prototypes
*****************************************************************************/
static int FilterCallback( vlc_object_t *, char const *,
vlc_value_t, vlc_value_t, void * );
typedef void (*SepiaFunction)( picture_t *, picture_t *, int );
static const struct
{
vlc_fourcc_t i_chroma;
SepiaFunction pf_sepia;
} p_sepia_cfg[] = {
{ VLC_CODEC_I420, PlanarI420Sepia },
{ VLC_CODEC_RGB24, RVSepia },
{ VLC_CODEC_RGB32, RVSepia },
{ VLC_CODEC_UYVY, PackedYUVSepia },
{ VLC_CODEC_VYUY, PackedYUVSepia },
{ VLC_CODEC_YUYV, PackedYUVSepia },
{ VLC_CODEC_YVYU, PackedYUVSepia },
{ 0, NULL }
};
/*****************************************************************************
* filter_sys_t: adjust filter method descriptor
*****************************************************************************/
struct filter_sys_t
{
SepiaFunction pf_sepia;
int i_intensity;
vlc_spinlock_t lock;
};
/*****************************************************************************
* Create: allocates Sepia video thread output method
*****************************************************************************
* This function allocates and initializes a Sepia vout method.
*****************************************************************************/
static int Create( vlc_object_t *p_this )
{
filter_t *p_filter = (filter_t *)p_this;
filter_sys_t *p_sys;
/* Allocate structure */
p_sys = p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
if( p_filter->p_sys == NULL )
return VLC_ENOMEM;
p_sys->pf_sepia = NULL;
for( int i = 0; p_sepia_cfg[i].i_chroma != 0; i++ )
{
if( p_sepia_cfg[i].i_chroma != p_filter->fmt_in.video.i_chroma )
continue;
p_sys->pf_sepia = p_sepia_cfg[i].pf_sepia;
}
if( p_sys->pf_sepia == NULL )
{
msg_Err( p_filter, "Unsupported input chroma (%4.4s)",
(char*)&(p_filter->fmt_in.video.i_chroma) );
free( p_sys );
return VLC_EGENERIC;
}
config_ChainParse( p_filter, CFG_PREFIX, ppsz_filter_options,
p_filter->p_cfg );
p_sys->i_intensity= var_CreateGetIntegerCommand( p_filter,
CFG_PREFIX "intensity" );
vlc_spin_init( &p_sys->lock );
var_AddCallback( p_filter, CFG_PREFIX "intensity", FilterCallback, NULL );
p_filter->pf_video_filter = Filter;
return VLC_SUCCESS;
}
/*****************************************************************************
* Destroy: destroy sepia video thread output method
*****************************************************************************
* Terminate an output method
*****************************************************************************/
static void Destroy( vlc_object_t *p_this )
{
filter_t *p_filter = (filter_t *)p_this;
var_DelCallback( p_filter, CFG_PREFIX "intensity", FilterCallback, NULL );
vlc_spin_destroy( &p_filter->p_sys->lock );
free( p_filter->p_sys );
}
/*****************************************************************************
* Render: displays previously rendered output
*****************************************************************************
* This function send the currently rendered image to sepia 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 intensity;
if( !p_pic ) return NULL;
filter_sys_t *p_sys = p_filter->p_sys;
vlc_spin_lock( &p_sys->lock );
intensity = p_sys->i_intensity;
vlc_spin_unlock( &p_sys->lock );
p_outpic = filter_NewPicture( p_filter );
if( !p_outpic )
{
msg_Warn( p_filter, "can't get output picture" );
picture_Release( p_pic );
return NULL;
}
p_sys->pf_sepia( p_pic, p_outpic, intensity );
return CopyInfoAndRelease( p_outpic, p_pic );
}
/***********************************************************************
* Utils
***********************************************************************/
static inline uint8_t vlc_uint8( int v )
{
if( v > 255 )
return 255;
else if( v < 0 )
return 0;
return v;
}
static inline void yuv_to_rgb( int *r, int *g, int *b,
uint8_t y1, uint8_t u1, uint8_t v1 )
{
/* macros used for YUV pixel conversions */
# define SCALEBITS 10
# define ONE_HALF (1 << (SCALEBITS - 1))
# define FIX(x) ((int) ((x) * (1<<SCALEBITS) + 0.5))
int y, cb, cr, r_add, g_add, b_add;
cb = u1 - 128;
cr = v1 - 128;
r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;
g_add = - FIX(0.34414*255.0/224.0) * cb
- FIX(0.71414*255.0/224.0) * cr + ONE_HALF;
b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;
y = (y1 - 16) * FIX(255.0/219.0);
*r = vlc_uint8( (y + r_add) >> SCALEBITS );
*g = vlc_uint8( (y + g_add) >> SCALEBITS );
*b = vlc_uint8( (y + b_add) >> SCALEBITS );
#undef FIX
#undef ONE_HALF
#undef SCALEBITS
}
static void vlc_rgb_index( int *pi_rindex, int *pi_gindex, int *pi_bindex,
const video_format_t *p_fmt )
{
if( p_fmt->i_chroma != VLC_CODEC_RGB24 && p_fmt->i_chroma != VLC_CODEC_RGB32 )
return;
#ifdef WORDS_BIGENDIAN
const int i_mask_bits = p_fmt->i_chroma == VLC_CODEC_RGB24 ? 24 : 32;
*pi_rindex = ( i_mask_bits - p_fmt->i_lrshift ) / 8;
*pi_gindex = ( i_mask_bits - p_fmt->i_lgshift ) / 8;
*pi_bindex = ( i_mask_bits - p_fmt->i_lbshift ) / 8;
#else
*pi_rindex = p_fmt->i_lrshift / 8;
*pi_gindex = p_fmt->i_lgshift / 8;
*pi_bindex = p_fmt->i_lbshift / 8;
#endif
}
static void vlc_yuv_index( int *pi_y_index, int *pi_u_index, int *pi_v_index,
const video_format_t *p_fmt )
{
if(
p_fmt->i_chroma != VLC_CODEC_UYVY &&
p_fmt->i_chroma != VLC_CODEC_VYUY &&
p_fmt->i_chroma != VLC_CODEC_YUYV &&
p_fmt->i_chroma != VLC_CODEC_YVYU )
return;
switch( p_fmt->i_chroma )
{
case VLC_CODEC_UYVY:
*pi_u_index = 0;
*pi_y_index = 1;
*pi_v_index = 2;
break;
case VLC_CODEC_VYUY:
*pi_v_index = 0;
*pi_y_index = 1;
*pi_u_index = 2;
break;
case VLC_CODEC_YUYV:
*pi_y_index = 0;
*pi_u_index = 1;
*pi_v_index = 3;
break;
case VLC_CODEC_YVYU:
*pi_y_index = 0;
*pi_v_index = 1;
*pi_u_index = 3;
break;
}
}
/*****************************************************************************
* PlanarI420Sepia: Applies sepia to one frame of the planar I420 video
*****************************************************************************
* This function applies sepia effect to one frame of the video by iterating
* through video lines. We iterate for every two lines and for every two pixels
* in line to calculate new sepia values for four y components as well for u
* and v components.
*****************************************************************************/
static void PlanarI420Sepia( picture_t *p_pic, picture_t *p_outpic,
int i_intensity )
{
/* iterate for every two visible line in the frame */
for( int y = 0; y < p_pic->p[Y_PLANE].i_visible_lines - 1; y += 2)
{
const int i_sy_line1_start = y * p_pic->p[Y_PLANE].i_pitch;
const int i_sy_line2_start = ( y + 1 ) * p_pic->p[Y_PLANE].i_pitch;
const int i_su_line_start = (y/2) * p_pic->p[U_PLANE].i_pitch;
const int i_sv_line_start = (y/2) * p_pic->p[V_PLANE].i_pitch;
const int i_dy_line1_start = y * p_outpic->p[Y_PLANE].i_pitch;
const int i_dy_line2_start = ( y + 1 ) * p_outpic->p[Y_PLANE].i_pitch;
const int i_du_line_start = (y/2) * p_outpic->p[U_PLANE].i_pitch;
const int i_dv_line_start = (y/2) * p_outpic->p[V_PLANE].i_pitch;
/* iterate for every two visible line in the frame */
for( int x = 0; x < p_pic->p[Y_PLANE].i_visible_pitch - 1; x += 2)
{
uint8_t sy1, sy2, sy3, sy4, su, sv;
uint8_t dy1, dy2, dy3, dy4, du, dv;
const int i_sy_line1_offset = i_sy_line1_start + x;
const int i_sy_line2_offset = i_sy_line2_start + x;
const int i_dy_line1_offset = i_dy_line1_start + x;
const int i_dy_line2_offset = i_dy_line2_start + x;
/* get four y components and u and v component */
sy1 = p_pic->p[Y_PLANE].p_pixels[i_sy_line1_offset];
sy2 = p_pic->p[Y_PLANE].p_pixels[i_sy_line1_offset + 1];
sy3 = p_pic->p[Y_PLANE].p_pixels[i_sy_line2_offset];
sy4 = p_pic->p[Y_PLANE].p_pixels[i_sy_line2_offset + 1];
su = p_pic->p[U_PLANE].p_pixels[i_su_line_start + (x/2)];
sv = p_pic->p[V_PLANE].p_pixels[i_sv_line_start + (x/2)];
/* calculate sepia values */
YuvSepia4( &dy1, &dy2, &dy3, &dy4, &du, &dv,
sy1, sy2, sy3, sy4, su, sv, i_intensity );
/* put new sepia values for all four y components and u and v */
p_outpic->p[Y_PLANE].p_pixels[i_dy_line1_offset] = dy1;
p_outpic->p[Y_PLANE].p_pixels[i_dy_line1_offset + 1] = dy2;
p_outpic->p[Y_PLANE].p_pixels[i_dy_line2_offset] = dy3;
p_outpic->p[Y_PLANE].p_pixels[i_dy_line2_offset + 1] = dy4;
p_outpic->p[U_PLANE].p_pixels[i_du_line_start + (x/2)] = du;
p_outpic->p[V_PLANE].p_pixels[i_dv_line_start + (x/2)] = dv;
}
}
}
/*****************************************************************************
* PackedYUVSepia: Applies sepia to one frame of the packed YUV video
*****************************************************************************
* This function applies sepia effext to one frame of the video by iterating
* through video lines. In every pass, we calculate new values for pixels
* (UYVY, VYUY, YUYV and YVYU formats are supported)
*****************************************************************************/
static void PackedYUVSepia( picture_t *p_pic, picture_t *p_outpic,
int i_intensity )
{
uint8_t *p_in, *p_in_end, *p_line_start, *p_line_end, *p_out;
int i_yindex = 1, i_uindex = 2, i_vindex = 0;
vlc_yuv_index( &i_yindex, &i_vindex, &i_uindex, &p_outpic->format );
p_in = p_pic->p[0].p_pixels;
p_in_end = p_in + p_pic->p[0].i_visible_lines
* p_pic->p[0].i_pitch;
p_out = p_outpic->p[0].p_pixels;
while( p_in < p_in_end )
{
p_line_start = p_in;
p_line_end = p_in + p_pic->p[0].i_visible_pitch;
while( p_in < p_line_end )
{
/* calculate new, sepia values */
YuvSepia2( &p_out[i_yindex], &p_out[i_yindex + 2], &p_out[i_uindex],
&p_out[i_vindex], p_in[i_yindex], p_in[i_yindex + 2],
p_in[i_uindex], p_in[i_vindex], i_intensity );
p_in += 4;
p_out += 4;
}
p_in += p_pic->p[0].i_pitch - p_pic->p[0].i_visible_pitch;
p_out += p_outpic->p[0].i_pitch
- p_outpic->p[0].i_visible_pitch;
}
}
/*****************************************************************************
* RVSepia: Applies sepia to one frame of the RV24/RV32 video
*****************************************************************************
* This function applies sepia effect to one frame of the video by iterating
* through video lines and calculating new values for every byte in chunks of
* 3 (RV24) or 4 (RV32) bytes.
*****************************************************************************/
static void RVSepia( picture_t *p_pic, picture_t *p_outpic, int i_intensity )
{
uint8_t *p_in, *p_in_end, *p_line_start, *p_line_end, *p_out;
int i_r, i_g, i_b;
bool b_isRV32 = p_pic->format.i_chroma == VLC_CODEC_RGB32;
int i_rindex = 0, i_gindex = 1, i_bindex = 2;
vlc_rgb_index( &i_rindex, &i_gindex, &i_bindex, &p_outpic->format );
p_in = p_pic->p[0].p_pixels;
p_in_end = p_in + p_pic->p[0].i_visible_lines
* p_pic->p[0].i_pitch;
p_out = p_outpic->p[0].p_pixels;
while( p_in < p_in_end )
{
p_line_start = p_in;
p_line_end = p_in + p_pic->p[0].i_visible_pitch;
while( p_in < p_line_end )
{
/* extract r,g,b values */
i_r = p_in[i_rindex];
i_g = p_in[i_gindex];
i_b = p_in[i_bindex];
p_in += 3;
/* do sepia */
Sepia( &i_r, &i_g, &i_b, i_intensity );
/* put new r,g,b values */
p_out[i_rindex] = i_r;
p_out[i_gindex] = i_g;
p_out[i_bindex] = i_b;
p_out += 3;
/* for rv32 we take 4 chunks at the time */
if ( b_isRV32 )
{
/* alpha channel stays the same */
*p_out++ = *p_in++;
}
}
p_in += p_pic->p[0].i_pitch - p_pic->p[0].i_visible_pitch;
p_out += p_outpic->p[0].i_pitch
- p_outpic->p[0].i_visible_pitch;
}
}
/*****************************************************************************
* YuvSepia2: Calculates sepia to YUV values for two given Y values
*****************************************************************************
* This function calculates sepia values of YUV color space for a given sepia
* intensity. It converts YUV color values to theirs RGB equivalents,
* calculates sepia values and then converts RGB values to YUV values again.
*****************************************************************************/
static void YuvSepia2( uint8_t* sepia_y1, uint8_t* sepia_y2, uint8_t* sepia_u,
uint8_t* sepia_v, const uint8_t y1, const uint8_t y2,
const uint8_t u, const uint8_t v, int i_intensity )
{
int r1, g1, b1; /* for y1 new value */
int r2, b2, g2; /* for y2 new value */
int r3, g3, b3; /* for new values of u and v */
/* fist convert YUV -> RGB */
yuv_to_rgb( &r1, &g1, &b1, y1, u, v );
yuv_to_rgb( &r2, &g2, &b2, y2, u, v );
yuv_to_rgb( &r3, &g3, &b3, ( y1 + y2 ) / 2, u, v );
/* calculates new values for r, g and b components */
Sepia( &r1, &g1, &b1, i_intensity );
Sepia( &r2, &g2, &b2, i_intensity );
Sepia( &r3, &g3, &b3, i_intensity );
/* convert from calculated RGB -> YUV */
*sepia_y1 = ( ( 66 * r1 + 129 * g1 + 25 * b1 + 128 ) >> 8 ) + 16;
*sepia_y2 = ( ( 66 * r2 + 129 * g2 + 25 * b2 + 128 ) >> 8 ) + 16;
*sepia_u = ( ( -38 * r3 - 74 * g3 + 112 * b3 + 128 ) >> 8 ) + 128;
*sepia_v = ( ( 112 * r3 - 94 * g3 - 18 * b3 + 128 ) >> 8 ) + 128;
}
/*****************************************************************************
* YuvSepia4: Calculates sepia to YUV values for given four Y values
*****************************************************************************
* This function calculates sepia values of YUV color space for a given sepia
* intensity. It converts YUV color values to theirs RGB equivalents,
* calculates sepia values and then converts RGB values to YUV values again.
*****************************************************************************/
static void YuvSepia4( uint8_t* sepia_y1, uint8_t* sepia_y2, uint8_t* sepia_y3,
uint8_t* sepia_y4, uint8_t* sepia_u, uint8_t* sepia_v,
const uint8_t y1, const uint8_t y2, const uint8_t y3,
const uint8_t y4, const uint8_t u, uint8_t v,
int i_intensity )
{
int r1, g1, b1; /* for y1 new value */
int r2, b2, g2; /* for y2 new value */
int r3, b3, g3; /* for y3 new value */
int r4, b4, g4; /* for y4 new value */
int r5, g5, b5; /* for new values of u and v */
/* fist convert YUV -> RGB */
yuv_to_rgb( &r1, &g1, &b1, y1, u, v );
yuv_to_rgb( &r2, &g2, &b2, y2, u, v );
yuv_to_rgb( &r3, &g3, &b3, y3, u, v );
yuv_to_rgb( &r4, &g4, &b4, y4, u, v );
yuv_to_rgb( &r5, &g5, &b5, ( y1 + y2 + y3 + y4) / 4, u, v );
/* calculates new values for r, g and b components */
Sepia( &r1, &g1, &b1, i_intensity );
Sepia( &r2, &g2, &b2, i_intensity );
Sepia( &r3, &g3, &b3, i_intensity );
Sepia( &r4, &g4, &b4, i_intensity );
Sepia( &r5, &g5, &b5, i_intensity );
/* convert from calculated RGB -> YUV */
*sepia_y1 = ( ( 66 * r1 + 129 * g1 + 25 * b1 + 128 ) >> 8 ) + 16;
*sepia_y2 = ( ( 66 * r2 + 129 * g2 + 25 * b2 + 128 ) >> 8 ) + 16;
*sepia_y3 = ( ( 66 * r3 + 129 * g3 + 25 * b3 + 128 ) >> 8 ) + 16;
*sepia_y4 = ( ( 66 * r4 + 129 * g4 + 25 * b4 + 128 ) >> 8 ) + 16;
*sepia_u = ( ( -38 * r5 - 74 * g5 + 112 * b5 + 128 ) >> 8 ) + 128;
*sepia_v = ( ( 112 * r5 - 94 * g5 - 18 * b5 + 128 ) >> 8 ) + 128;
}
/*****************************************************************************
* Sepia: Calculates sepia of RGB values
*****************************************************************************
* This function calculates sepia values of RGB color space for a given sepia
* intensity. Sepia algorithm is taken from here:
* http://groups.google.com/group/comp.lang.java.programmer/browse_thread/
* thread/9d20a72c40b119d0/18f12770ec6d9dd6
*****************************************************************************/
static void Sepia( int *p_r, int *p_g, int *p_b, int i_intensity )
{
int i_sepia_depth = 20;
int16_t i_round;
i_round = ( *p_r + *p_g + *p_b ) / 3;
*p_r = vlc_uint8( i_round + ( i_sepia_depth * 2 ) );
*p_g = vlc_uint8( i_round + i_sepia_depth );
*p_b = vlc_uint8( i_round - i_intensity );
}
static int FilterCallback ( vlc_object_t *p_this, char const *psz_var,
vlc_value_t oldval, vlc_value_t newval,
void *p_data )
{
VLC_UNUSED(psz_var); VLC_UNUSED(oldval); VLC_UNUSED(p_data);
filter_t *p_filter = (filter_t*)p_this;
filter_sys_t *p_sys = p_filter->p_sys;
vlc_spin_lock( &p_sys->lock );
p_sys->i_intensity = newval.i_int;
vlc_spin_unlock( &p_sys->lock );
return VLC_SUCCESS;
}

1
po/POTFILES.in
View File

@ -1122,6 +1122,7 @@ modules/video_filter/rss.c
modules/video_filter/rv32.c
modules/video_filter/scale.c
modules/video_filter/scene.c
modules/video_filter/sepia.c
modules/video_filter/sharpen.c
modules/video_filter/swscale.c
modules/video_filter/swscale_omap.c