Sharpen Video-Filter.

Work from DJ_Mulder on the forum, changes by /me helped by dionoea and jpsaman.

configure.ac

@@ -1127,7 +1127,7 @@ dnl
 VLC_ADD_PLUGINS([dummy logger memcpy])
 VLC_ADD_PLUGINS([mpgv mpga m4v m4a h264 ps pva avi asf mp4 rawdv nsv real aiff mjpeg demuxdump flacsys tta])
 VLC_ADD_PLUGINS([cvdsub svcdsub spudec telx subsdec dvbsub mpeg_audio lpcm a52 dts cinepak flac])
-VLC_ADD_PLUGINS([deinterlace invert adjust transform wave ripple psychedelic gradient motionblur rv32 rotate noise extract])
+VLC_ADD_PLUGINS([deinterlace invert adjust transform wave ripple psychedelic gradient motionblur rv32 rotate noise extract sharpen])
 VLC_ADD_PLUGINS([converter_fixed mono])
 VLC_ADD_PLUGINS([trivial_resampler ugly_resampler])
 VLC_ADD_PLUGINS([trivial_channel_mixer trivial_mixer])

modules/video_filter/Modules.am

@@ -28,4 +28,5 @@ SOURCES_noise = noise.c
 SOURCES_puzzle = puzzle.c
 SOURCES_colorthres = colorthres.c
 SOURCES_extract = extract.c
+SOURCES_sharpen = sharpen.c
 noinst_HEADERS = filter_common.h

modules/video_filter/sharpen.c

+/*****************************************************************************
+ * sharpen.c: Sharpen video filter
+ *****************************************************************************
+ * Copyright (C) 2003 the VideoLAN team
+ * $Id: sharpen.c 18062 2006-11-26 14:20:34Z zorglub $
+ *
+ * Author: Jrmy DEMEULE <dj_mulder at djduron dot no-ip dot 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+/* The sharpen filter. */
+/*
+ * static int filter[] = { -1, -1, -1,
+ *                         -1,  8, -1,
+ *                         -1, -1, -1 };
+ */
+
+/*****************************************************************************
+ * Preamble
+ *****************************************************************************/
+#include <stdlib.h>                                      /* malloc(), free() */
+#include <string.h>
+
+#include <vlc/vlc.h>
+#include <vlc_vout.h>
+
+#include "vlc_filter.h"
+
+#define SIG_TEXT N_("Sharpen strength (0-2)")
+#define SIG_LONGTEXT N_("Set the Sharpen strength, between 0 and 2. Defaults to 0.05.")
+
+/*****************************************************************************
+ * 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( _("Augment contrast between contours.") );
+    set_shortname( _("Sharpen video filter") );
+    set_category( CAT_VIDEO );
+    set_subcategory( SUBCAT_VIDEO_VFILTER );
+    set_capability( "video filter2", 0 );
+    add_float_with_range( "sharpen-sigma", 0.05, 0.0, 2.0, NULL,
+        SIG_TEXT, SIG_LONGTEXT, VLC_FALSE );
+    add_shortcut( "sharpen" );
+    set_callbacks( Create, Destroy );
+vlc_module_end();
+
+/*****************************************************************************
+ * filter_sys_t: Sharpen video filter descriptor
+ *****************************************************************************
+ * This structure is part of the video output thread descriptor.
+ * It describes the Sharpen specific properties of an output thread.
+ *****************************************************************************/
+
+struct filter_sys_t
+{
+    float f_sigma;
+};
+
+/*****************************************************************************
+ * clip: avoid negative value and value > 255
+ *****************************************************************************/
+inline static int32_t clip( int32_t a )
+{
+    return (a > 255) ? 255 : (a < 0) ? 0 : a;
+}
+
+/*****************************************************************************
+ * Create: allocates Sharpen video thread output method
+ *****************************************************************************
+ * This function allocates and initializes a Sharpen vout method.
+ *****************************************************************************/
+static int Create( vlc_object_t *p_this )
+{
+    filter_t *p_filter = (filter_t *)p_this;
+
+    /* Allocate structure */
+    p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
+    if( p_filter->p_sys == NULL )
+    {
+        msg_Err( p_filter, "out of memory" );
+        return VLC_ENOMEM;
+    }
+
+    p_filter->pf_video_filter = Filter;
+
+    p_filter->p_sys->f_sigma = var_GetFloat(p_this, "sharpen-sigma");
+
+    return VLC_SUCCESS;
+}
+
+
+/*****************************************************************************
+ * Destroy: destroy Sharpen video thread output method
+ *****************************************************************************
+ * Terminate an output method created by SharpenCreateOutputMethod
+ *****************************************************************************/
+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 Invert 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 i, j;
+    vlc_value_t val;
+    uint8_t *p_src = NULL;
+    uint8_t *p_out = NULL;
+    int i_src_pitch;
+    int pix;
+    const int v1 = -1;
+    const int v2 = 3; /* 2^3 = 8 */
+
+    if( !p_pic ) return NULL;
+    if( !p_filter ) return NULL;
+    if( !p_filter->p_sys ) return NULL;
+
+    p_outpic = p_filter->pf_vout_buffer_new( p_filter );
+    if( !p_outpic )
+    {
+        msg_Warn( p_filter, "can't get output picture" );
+        if( p_pic->pf_release )
+            p_pic->pf_release( p_pic );
+        return NULL;
+    }
+
+    /* process the Y plane */
+    p_src = p_pic->p[Y_PLANE].p_pixels;
+    p_out = p_outpic->p[Y_PLANE].p_pixels;
+    if( !p_src || !p_out )
+    {
+        msg_Warn( p_filter, "can't get Y plane" );
+        if( p_pic->pf_release ) 
+            p_pic->pf_release( p_pic );
+        return NULL;
+    }
+
+    i_src_pitch = p_pic->p[Y_PLANE].i_visible_pitch;
+
+    /* perform convolution only on Y plane. Avoid border line. */
+    for( i = 0; i < p_pic->p[Y_PLANE].i_visible_lines; i++ )
+    {
+        if( (i == 0) || (i == p_pic->p[Y_PLANE].i_visible_lines - 1) )
+        {
+            for( j = 0; j < p_pic->p[Y_PLANE].i_visible_pitch; j++ )
+                p_out[i * i_src_pitch + j] = clip( p_src[i * i_src_pitch + j] );
+            continue ;
+        }
+        for( j = 0; j < p_pic->p[Y_PLANE].i_visible_pitch; j++ )
+        {
+            if( (j == 0) || (j == p_pic->p[Y_PLANE].i_visible_pitch - 1) )
+            {
+                p_out[i * i_src_pitch + j] = p_src[i * i_src_pitch + j];
+                continue ;
+            }
+
+            pix = (p_src[(i - 1) * i_src_pitch + j - 1] * v1) +
+                  (p_src[(i - 1) * i_src_pitch + j    ] * v1) +
+                  (p_src[(i - 1) * i_src_pitch + j + 1] * v1) +
+                  (p_src[(i    ) * i_src_pitch + j - 1] * v1) +
+                  (p_src[(i    ) * i_src_pitch + j    ] << v2) +
+                  (p_src[(i    ) * i_src_pitch + j + 1] * v1) +
+                  (p_src[(i + 1) * i_src_pitch + j - 1] * v1) +
+                  (p_src[(i + 1) * i_src_pitch + j    ] * v1) +
+                  (p_src[(i + 1) * i_src_pitch + j + 1] * v1);
+
+            p_out[i * i_src_pitch + j] =  clip( p_src[i * i_src_pitch + j] +
+                        (p_filter->p_sys->f_sigma * pix) );
+        }
+    }
+
+
+    p_filter->p_libvlc->pf_memcpy( p_outpic->p[U_PLANE].p_pixels,
+            p_pic->p[U_PLANE].p_pixels,
+            p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
+
+    p_filter->p_libvlc->pf_memcpy( p_outpic->p[V_PLANE].p_pixels,
+            p_pic->p[V_PLANE].p_pixels,
+            p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
+
+
+    p_outpic->date = p_pic->date;
+    p_outpic->b_force = p_pic->b_force;
+    p_outpic->i_nb_fields = p_pic->i_nb_fields;
+    p_outpic->b_progressive = p_pic->b_progressive;
+    p_outpic->b_top_field_first = p_pic->b_top_field_first;
+
+    if( p_pic->pf_release )
+        p_pic->pf_release( p_pic );
+
+    return p_outpic;
+}