An motion blur filter. --blur-factor states the degree of blurring from 1

to 127. about 100 is cool

modules/video_filter/Makefile

@@ -4,3 +4,4 @@ distort_SOURCES = distort.c
 wall_SOURCES = wall.c
 clone_SOURCES = clone.c
 crop_SOURCES = crop.c
+motionblur_SOURCES = motionblur.c

modules/video_filter/motionblur.c

+/*****************************************************************************
+ * motion_blur.c : motion blur filter for vlc
+ *****************************************************************************
+ * Copyright (C) 2000, 2001 VideoLAN
+ * $Id: motionblur.c,v 1.1 2002/08/26 22:35:58 sigmunau Exp $
+ *
+ * Authors: Sigmund Augdal <sigmunau@idi.ntnu.no>
+ *
+ * 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 <errno.h>
+#include <stdlib.h>                                      /* malloc(), free() */
+#include <string.h>
+
+#include <vlc/vlc.h>
+#include <vlc/vout.h>
+
+#include "filter_common.h"
+
+/*****************************************************************************
+ * Local protypes
+ *****************************************************************************/
+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 RenderBlur    ( vout_thread_t *, picture_t *, picture_t *, picture_t * );
+static void CopyPicture ( vout_thread_t*, picture_t *, picture_t * );
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+#define MODE_TEXT N_("Blur factor")
+#define MODE_LONGTEXT N_("The degree of blurring from 1 to 127")
+
+vlc_module_begin();
+    add_category_hint( N_("Miscellaneous"), NULL );
+    add_integer( "blur-factor", 80, NULL, MODE_TEXT, MODE_LONGTEXT );
+    set_description( _("Motion blur filter") );
+    set_capability( "video filter", 0 );
+    set_callbacks( Create, Destroy );
+vlc_module_end();
+
+/*****************************************************************************
+ * vout_sys_t: Deinterlace video output method descriptor
+ *****************************************************************************
+ * This structure is part of the video output thread descriptor.
+ * It describes the Deinterlace specific properties of an output thread.
+ *****************************************************************************/
+struct vout_sys_t
+{
+    int        i_factor;        /* Deinterlace mode */
+    vlc_bool_t b_double_rate; /* Shall we double the framerate? */
+
+    mtime_t    last_date;
+    mtime_t    next_date;
+
+    vout_thread_t *p_vout;
+    picture_t *p_lastpic;
+};
+
+/*****************************************************************************
+ * Create: allocates Deinterlace video thread output method
+ *****************************************************************************
+ * This function allocates and initializes a Deinterlace vout method.
+ *****************************************************************************/
+static int Create( vlc_object_t *p_this )
+{   
+    vout_thread_t *p_vout = (vout_thread_t *)p_this;
+
+    /* 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 1;
+    }
+
+    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_factor = config_GetInt( p_vout, "blur-factor" );
+    p_vout->p_sys->b_double_rate = 0;
+    p_vout->p_sys->last_date = 0;
+    p_vout->p_sys->p_lastpic = NULL;
+
+    return 0;
+}
+
+/*****************************************************************************
+ * Init: initialize Deinterlace 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, full of directbuffers since we want
+     * the decoder to output directly to our structures. */
+    switch( p_vout->render.i_chroma )
+    {
+        case VLC_FOURCC('I','4','2','0'):
+        case VLC_FOURCC('I','Y','U','V'):
+        case VLC_FOURCC('Y','V','1','2'):
+        case VLC_FOURCC('I','4','2','2'):
+            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;
+            break;
+
+        default:
+            return 0; /* unknown chroma */
+            break;
+    }
+
+    msg_Dbg( p_vout, "spawning the real video output" );
+
+    switch( p_vout->render.i_chroma )
+    {
+    case VLC_FOURCC('I','4','2','0'):
+    case VLC_FOURCC('I','Y','U','V'):
+    case VLC_FOURCC('Y','V','1','2'):
+        p_vout->p_sys->p_vout =
+            vout_CreateThread( p_vout,
+                               p_vout->output.i_width, p_vout->output.i_height,
+                               p_vout->output.i_chroma, p_vout->output.i_aspect );
+        break;
+    default:
+        break;
+    }
+
+    /* Everything failed */
+    if( p_vout->p_sys->p_vout == NULL )
+    {
+        msg_Err( p_vout, "cannot open vout, aborting" );
+
+        return 0;
+    }
+ 
+    ALLOCATE_DIRECTBUFFERS( VOUT_MAX_PICTURES );
+
+    return 0;
+}
+
+/*****************************************************************************
+ * End: terminate Deinterlace 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 Deinterlace video thread output method
+ *****************************************************************************
+ * Terminate an output method created by DeinterlaceCreateOutputMethod
+ *****************************************************************************/
+static void Destroy( vlc_object_t *p_this )
+{
+    vout_thread_t *p_vout = (vout_thread_t *)p_this;
+
+    vout_DestroyThread( p_vout->p_sys->p_vout );
+
+    free( p_vout->p_sys );
+}
+
+/*****************************************************************************
+ * Render: displays previously rendered output
+ *****************************************************************************
+ * This function send the currently rendered image to Deinterlace 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;
+    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_outpic, p_pic->date );
+    
+    if ( p_vout->p_sys->p_lastpic == NULL )
+    {
+        /* Get a new picture */
+        while( ( p_vout->p_sys->p_lastpic =
+                 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 );
+        }
+        CopyPicture( p_vout, p_vout->p_sys->p_lastpic, p_pic );
+        CopyPicture( p_vout, p_outpic, p_pic );
+        vout_DisplayPicture( p_vout->p_sys->p_vout, p_outpic );
+        return;
+    }
+
+    /* Get a new picture */
+    RenderBlur( p_vout, p_vout->p_sys->p_lastpic, p_pic, p_outpic );
+    vout_DestroyPicture( p_vout, p_vout->p_sys->p_lastpic );
+
+
+    /* Get a new picture */
+    while( ( p_vout->p_sys->p_lastpic =
+             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 );
+    }
+    CopyPicture( p_vout, p_vout->p_sys->p_lastpic, p_outpic );
+    vout_DisplayPicture( p_vout->p_sys->p_vout, p_outpic );
+
+}
+
+static void CopyPicture( vout_thread_t *p_vout,
+                         picture_t *p_dest, picture_t *p_source)
+{
+    int i_plane;
+
+    for( i_plane = 0 ; i_plane < p_dest->i_planes ; i_plane++ )
+    {
+        u8 *p_in, *p_out;
+
+        p_in = p_source->p[i_plane].p_pixels;
+
+        p_out = p_dest->p[i_plane].p_pixels;
+        p_vout->p_vlc->pf_memcpy( p_out, p_in,
+                                  p_dest->p[i_plane].i_pitch *
+                                  p_dest->p[i_plane].i_lines);
+    }
+}
+/*****************************************************************************
+ * RenderBob: renders a bob picture
+ *****************************************************************************/
+static void RenderBlur( vout_thread_t *p_vout, picture_t *p_oldpic,
+                        picture_t *p_newpic, picture_t *p_outpic )
+{
+    int i_plane;
+    int i_oldfactor = p_vout->p_sys->i_factor;
+    int i_newfactor = 128 - p_vout->p_sys->i_factor;
+    for( i_plane = 0; i_plane < p_outpic->i_planes; i_plane++ )
+    {
+        u8 *p_old, *p_new, *p_out, *p_out_end;
+        p_out = p_outpic->p[i_plane].p_pixels;
+        p_new = p_newpic->p[i_plane].p_pixels;
+        p_old = p_oldpic->p[i_plane].p_pixels;
+        p_out_end = p_out + p_outpic->p[i_plane].i_pitch *
+            p_outpic->p[i_plane].i_lines;
+        while ( p_out < p_out_end +4 )
+        {
+            *p_out++ = (((*p_old++) * i_oldfactor) + ((*p_new++) * i_newfactor))>>7;
+//            *p_out++ = (*p_old++ >> 1) + (*p_new++ >> 1);
+        }
+    }
+}