--- /dev/null
+/*****************************************************************************
+ * posterize.c : Posterize 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 picture_t *Filter( filter_t *, picture_t * );
+static void PlanarYUVPosterize( picture_t *, picture_t *, int);
+static void PackedYUVPosterize( picture_t *, picture_t *, int);
+static void RVPosterize( picture_t *, picture_t *, bool, int );
+static void YuvPosterization( uint8_t *, uint8_t *, uint8_t *, uint8_t *,
+ uint8_t, uint8_t, uint8_t, uint8_t, int );
+static void yuv2rgb( uint8_t *, uint8_t *, uint8_t *,
+ uint8_t, uint8_t, uint8_t);
+
+static const char *const ppsz_filter_options[] = {
+ "level", NULL
+};
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+#define POSTERIZE_LEVEL_TEXT N_("Posterize level")
+#define POSTERIZE_LEVEL_LONGTEXT N_("Posterize level "\
+ "(number of colors is cube of this value)" )
+
+#define CFG_PREFIX "posterize-"
+
+vlc_module_begin ()
+ set_description( N_("Posterize video filter") )
+ set_shortname( N_("Posterize" ) )
+ set_help( N_("Posterize video by lowering the number of colors") )
+ set_category( CAT_VIDEO )
+ set_subcategory( SUBCAT_VIDEO_VFILTER )
+ set_capability( "video filter2", 0 )
+ add_integer_with_range( CFG_PREFIX "level", 6, 2, 256, NULL,
+ POSTERIZE_LEVEL_TEXT, POSTERIZE_LEVEL_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 * );
+
+/*****************************************************************************
+ * filter_sys_t: adjust filter method descriptor
+ *****************************************************************************/
+struct filter_sys_t
+{
+ int i_level;
+ vlc_mutex_t lock;
+};
+
+/*****************************************************************************
+ * Create: allocates Posterize video thread output method
+ *****************************************************************************
+ * This function allocates and initializes a Posterize vout method.
+ *****************************************************************************/
+static int Create( vlc_object_t *p_this )
+{
+ filter_t *p_filter = (filter_t *)p_this;
+ filter_sys_t *p_sys;
+
+ switch( p_filter->fmt_in.video.i_chroma )
+ {
+ CASE_PLANAR_YUV_SQUARE
+ break;
+ CASE_PACKED_YUV_422
+ break;
+ case VLC_CODEC_RGB24:
+ break;
+ case VLC_CODEC_RGB32:
+ break;
+ default:
+ msg_Err( p_filter, "Unsupported input chroma (%4.4s)",
+ (char*)&(p_filter->fmt_in.video.i_chroma) );
+ return VLC_EGENERIC;
+ }
+
+ if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
+ {
+ 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 );
+ p_sys->i_level = var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "level" );
+
+ vlc_mutex_init( &p_sys->lock );
+
+ var_AddCallback( p_filter, CFG_PREFIX "level", FilterCallback, NULL );
+
+ p_filter->pf_video_filter = Filter;
+
+ return VLC_SUCCESS;
+}
+
+/*****************************************************************************
+ * Destroy: destroy Posterize video thread output method
+ *****************************************************************************
+ * Terminate an output method created by PosterizeCreateOutputMethod
+ *****************************************************************************/
+static void Destroy( vlc_object_t *p_this )
+{
+ filter_t *p_filter = (filter_t *)p_this;
+
+ var_DelCallback( p_filter, CFG_PREFIX "level", FilterCallback, NULL );
+
+ vlc_mutex_destroy( &p_filter->p_sys->lock );
+ free( p_filter->p_sys );
+}
+
+/*****************************************************************************
+ * Render: displays previously rendered output
+ *****************************************************************************
+ * This function send the currently rendered image to Posterize 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 level;
+
+ if( !p_pic ) return NULL;
+
+ filter_sys_t *p_sys = p_filter->p_sys;
+ vlc_mutex_lock( &p_sys->lock );
+ level = p_sys->i_level;
+ vlc_mutex_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;
+ }
+
+ switch( p_pic->format.i_chroma )
+ {
+ case VLC_CODEC_RGB24:
+ RVPosterize( p_pic, p_outpic, false, level );
+ break;
+ case VLC_CODEC_RGB32:
+ RVPosterize( p_pic, p_outpic, true, level );
+ break;
+ CASE_PLANAR_YUV_SQUARE
+ PlanarYUVPosterize( p_pic, p_outpic, level );
+ break;
+ CASE_PACKED_YUV_422
+ PackedYUVPosterize( p_pic, p_outpic, level );
+ break;
+ default:
+ assert( false );
+ }
+
+ return CopyInfoAndRelease( p_outpic, p_pic );
+}
+
+/*****************************************************************************
+ * For a given level, calculates new posterized value for pixel whose value x
+ * is in range of 0-255
+ *****************************************************************************/
+#define POSTERIZE_PIXEL(x, level) \
+ (((( x * level ) >> 8 ) * 255 ) / ( level - 1 ))
+
+/*****************************************************************************
+ * PlanarYUVPosterize: Posterize one frame of the planar YUV video
+ *****************************************************************************
+ * This function posterizes one frame of the video by iterating through video
+ * lines. In every pass, start of Y, U and V planes is calculated and for
+ * every pixel we calculate new values of YUV values.
+ *****************************************************************************/
+static void PlanarYUVPosterize( picture_t *p_pic, picture_t *p_outpic,
+ int i_level )
+{
+ uint8_t *p_in_y, *p_in_u, *p_in_v, *p_in_end_y, *p_line_end_y, *p_out_y,
+ *p_out_u, *p_out_v;
+ int i_current_line = 0;
+
+ p_in_y = p_pic->p[Y_PLANE].p_pixels;
+ p_in_end_y = p_in_y + p_pic->p[Y_PLANE].i_visible_lines
+ * p_pic->p[Y_PLANE].i_pitch;
+ p_out_y = p_outpic->p[Y_PLANE].p_pixels;
+
+ /* iterate for every visible line in the frame */
+ while( p_in_y < p_in_end_y )
+ {
+ p_line_end_y = p_in_y + p_pic->p[Y_PLANE].i_visible_pitch;
+ /* calculate start of U plane line */
+ p_in_u = p_pic->p[U_PLANE].p_pixels
+ + p_pic->p[U_PLANE].i_pitch * ( i_current_line / 2 );
+ p_out_u = p_outpic->p[U_PLANE].p_pixels
+ + p_outpic->p[U_PLANE].i_pitch * ( i_current_line / 2 );
+ /* calculate start of V plane line */
+ p_in_v = p_pic->p[V_PLANE].p_pixels
+ + p_pic->p[V_PLANE].i_pitch * ( i_current_line / 2 );
+ p_out_v = p_outpic->p[V_PLANE].p_pixels
+ + p_outpic->p[V_PLANE].i_pitch * ( i_current_line / 2 );
+ /* iterate for every two pixels in line */
+ while( p_in_y < p_line_end_y )
+ {
+ uint8_t y1, y2, u, v;
+ uint8_t posterized_y1, posterized_y2, posterized_u, posterized_v;
+ /* retrieve original YUV values */
+ y1 = *p_in_y++;
+ y2 = *p_in_y++;
+ u = *p_in_u++;
+ v = *p_in_v++;
+ /* do posterization */
+ YuvPosterization( &posterized_y1, &posterized_y2, &posterized_u,
+ &posterized_v, y1, y2, u, v, i_level );
+ /* put posterized valued */
+ *p_out_y++ = posterized_y1;
+ *p_out_y++ = posterized_y2;
+ *p_out_u++ = posterized_u;
+ *p_out_v++ = posterized_v;
+ }
+ p_in_y += p_pic->p[Y_PLANE].i_pitch
+ - p_pic->p[Y_PLANE].i_visible_pitch;
+ p_out_y += p_outpic->p[Y_PLANE].i_pitch
+ - p_outpic->p[Y_PLANE].i_visible_pitch;
+ i_current_line++;
+ }
+}
+
+/*****************************************************************************
+ * PackedYUVPosterize: Posterize one frame of the packed YUV video
+ *****************************************************************************
+ * This function posterizes 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 PackedYUVPosterize( picture_t *p_pic, picture_t *p_outpic, int i_level )
+{
+ uint8_t *p_in, *p_in_end, *p_line_start, *p_line_end, *p_out;
+ uint8_t y1, y2, u, v;
+
+ 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 )
+ {
+ uint8_t posterized_y1, posterized_y2, posterized_u, posterized_v;
+ /* extract proper pixel values */
+ switch( p_pic->format.i_chroma )
+ {
+ case VLC_CODEC_UYVY:
+ u = *p_in++;
+ y1 = *p_in++;
+ v = *p_in++;
+ y2 = *p_in++;
+ break;
+ case VLC_CODEC_VYUY:
+ v = *p_in++;
+ y1 = *p_in++;
+ u = *p_in++;
+ y2 = *p_in++;
+ break;
+ case VLC_CODEC_YUYV:
+ y1 = *p_in++;
+ u = *p_in++;
+ y2 = *p_in++;
+ v = *p_in++;
+ break;
+ case VLC_CODEC_YVYU:
+ y1 = *p_in++;
+ v = *p_in++;
+ y2 = *p_in++;
+ u = *p_in++;
+ break;
+ default:
+ assert( false );
+ }
+ /* do posterization */
+ YuvPosterization( &posterized_y1, &posterized_y2, &posterized_u,
+ &posterized_v, y1, y2, u, v, i_level );
+ /* put posterized values in proper place */
+ switch( p_pic->format.i_chroma )
+ {
+ case VLC_CODEC_UYVY:
+ *p_out++ = posterized_u;
+ *p_out++ = posterized_y1;
+ *p_out++ = posterized_v;
+ *p_out++ = posterized_y2;
+ break;
+ case VLC_CODEC_VYUY:
+ *p_out++ = posterized_v;
+ *p_out++ = posterized_y1;
+ *p_out++ = posterized_u;
+ *p_out++ = posterized_y2;
+ break;
+ case VLC_CODEC_YUYV:
+ *p_out++ = posterized_y1;
+ *p_out++ = posterized_u;
+ *p_out++ = posterized_y2;
+ *p_out++ = posterized_v;
+ break;
+ case VLC_CODEC_YVYU:
+ *p_out++ = posterized_y1;
+ *p_out++ = posterized_v;
+ *p_out++ = posterized_y2;
+ *p_out++ = posterized_u;
+ break;
+ default:
+ assert( false );
+ }
+ }
+ 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;
+ }
+}
+
+/*****************************************************************************
+ * RVPosterize: Posterize one frame of the RV24/RV32 video
+ *****************************************************************************
+ * This function posterizes 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 RVPosterize( picture_t *p_pic, picture_t *p_outpic,
+ bool rv32, int level )
+{
+ uint8_t *p_in, *p_in_end, *p_line_start, *p_line_end, *p_out, pixel;
+
+ 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 )
+ {
+ pixel = *p_in++;
+ *p_out++ = POSTERIZE_PIXEL( pixel, level );
+ pixel = *p_in++;
+ *p_out++ = POSTERIZE_PIXEL( pixel, level );
+ pixel = *p_in++;
+ *p_out++ = POSTERIZE_PIXEL( pixel, level );
+ /* for rv32 we take 4 chunks at the time */
+ if ( rv32 )
+ {
+ pixel = *p_in++;
+ *p_out++ = POSTERIZE_PIXEL( pixel, level );
+ }
+ }
+ 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;
+ }
+}
+
+/*****************************************************************************
+ * YuvPosterization: Lowers the color depth of YUV color space
+ *****************************************************************************
+ * This function lowers the color level of YUV color space to specified level
+ * by converting YUV color values to theirs RGB equivalents, calculates new
+ * values and then converts RGB values to YUV values again.
+ *****************************************************************************/
+static void YuvPosterization( uint8_t* posterized_y1, uint8_t* posterized_y2,
+ uint8_t* posterized_u, uint8_t* posterized_v,
+ uint8_t y1, uint8_t y2, uint8_t u, uint8_t v,
+ int i_level ) {
+ uint8_t r1, g1, b1; /* for y1 new value */
+ uint8_t r2, b2, g2; /* for y2 new value */
+ uint8_t r3, g3, b3; /* for new values of u and v */
+ /* fist convert YUV -> RGB */
+ yuv2rgb( &r1, &g1, &b1, y1, u, v );
+ yuv2rgb( &r2, &g2, &b2, y2, u, v );
+ yuv2rgb( &r3, &g3, &b3, ( y1 + y2 ) / 2, u, v );
+ /* round RGB values to specified posterize level */
+ r1 = POSTERIZE_PIXEL( r1, i_level );
+ g1 = POSTERIZE_PIXEL( g1, i_level );
+ b1 = POSTERIZE_PIXEL( b1, i_level );
+ r2 = POSTERIZE_PIXEL( r2, i_level );
+ g2 = POSTERIZE_PIXEL( g2, i_level );
+ b2 = POSTERIZE_PIXEL( b2, i_level );
+ r3 = POSTERIZE_PIXEL( r3, i_level );
+ g3 = POSTERIZE_PIXEL( g3, i_level );
+ b3 = POSTERIZE_PIXEL( b3, i_level );
+ /* convert from calculated RGB -> YUV */
+ *posterized_y1 = ( ( 66 * r1 + 129 * g1 + 25 * b1 + 128 ) >> 8 ) + 16;
+ *posterized_y2 = ( ( 66 * r2 + 129 * g2 + 25 * b2 + 128 ) >> 8 ) + 16;
+ *posterized_u = ( ( -38 * r3 - 74 * g3 + 112 * b3 + 128 ) >> 8 ) + 128;
+ *posterized_v = ( ( 112 * r3 - 94 * g3 - 18 * b3 + 128 ) >> 8 ) + 128;
+}
+
+/*****************************************************************************
+ * yuv2rgb: Converts from YUV to RGB color space
+ *****************************************************************************
+ * This function converts YUV values to RGB values using function defined in:
+ * http://msdn.microsoft.com/en-us/library/ms893078
+ *****************************************************************************/
+static void yuv2rgb( uint8_t* r, uint8_t* g, uint8_t* b, uint8_t y,
+ uint8_t u, uint8_t v )
+{
+ int16_t c = y - 16;
+ int16_t d = u - 128;
+ int16_t e = v - 128;
+ int16_t noclipped_r = ( 298 * c + 409 * e + 128 ) >> 8;
+ if ( noclipped_r < 0 )
+ {
+ *r=0;
+ }
+ else if ( noclipped_r > 255 )
+ {
+ *r = 255;
+ }
+ else
+ {
+ *r = noclipped_r;
+ }
+ int16_t noclipped_g = ( 298 * c - 100 * d - 208 * e + 128 ) >> 8;
+ if ( noclipped_g < 0 )
+ {
+ *g=0;
+ }
+ else if ( noclipped_g > 255 )
+ {
+ *g = 255;
+ }
+ else
+ {
+ *g = noclipped_g;
+ }
+ int16_t noclipped_b = ( 298 * c + 516 * d + 128 ) >> 8;
+ if ( noclipped_b < 0 )
+ {
+ *b=0;
+ }
+ else if ( noclipped_b > 255 )
+ {
+ *b = 255;
+ }
+ else
+ {
+ *b = noclipped_b;
+ }
+}
+
+static int FilterCallback ( vlc_object_t *p_this, char const *psz_var,
+ vlc_value_t oldval, vlc_value_t newval, void *p_data )
+{
+ (void)oldval; (void)p_data;
+ filter_t *p_filter = (filter_t*)p_this;
+ filter_sys_t *p_sys = p_filter->p_sys;
+
+ if( !strcmp( psz_var, CFG_PREFIX "level" ) )
+ {
+ vlc_mutex_lock( &p_sys->lock );
+ p_sys->i_level = newval.i_int;
+ vlc_mutex_unlock( &p_sys->lock );
+ }
+
+ return VLC_SUCCESS;
+}
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