time.c: a small module to place current time on top of video

modules/video_filter/time.c

+/*****************************************************************************
+ * time.c : time display video plugin for vlc
+ *****************************************************************************
+ * Copyright (C) 2003-2004 VideoLAN
+ * $Id: logo.c 8721 2004-09-17 10:21:00Z gbazin $
+ *
+ * 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 <stdlib.h>                                      /* malloc(), free() */
+#include <string.h>
+
+#include <vlc/vlc.h>
+#include <vlc/vout.h>
+
+#include "vlc_filter.h"
+#include "filter_common.h"
+#include "vlc_block.h"
+
+/*****************************************************************************
+ * Local prototypes
+ *****************************************************************************/
+static int  CreateFilter ( vlc_object_t * );
+static void DestroyFilter( vlc_object_t * );
+static subpicture_t *Filter( filter_t *, mtime_t );
+
+/*****************************************************************************
+ * filter_sys_t: time filter descriptor
+ *****************************************************************************/
+struct filter_sys_t
+{
+    picture_t *p_pic;
+
+    int i_width, i_height;
+    int posx, posy;
+
+    mtime_t i_last_date;
+    filter_t *p_text;
+};
+
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+vlc_module_begin();
+    set_capability( "sub filter", 0 );
+    set_callbacks( CreateFilter, DestroyFilter );
+    set_description( _("Logo sub filter") );
+    add_shortcut( "logo" );
+vlc_module_end();
+
+/*****************************************************************************
+ * CreateFilter: allocates logo video filter
+ *****************************************************************************/
+static int CreateFilter( 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_sys == NULL )
+    {
+        msg_Err( p_filter, "out of memory" );
+        return VLC_ENOMEM;
+    }
+
+    /* Misc init */
+    p_filter->pf_sub_filter = Filter;
+
+    return VLC_SUCCESS;
+}
+/*****************************************************************************
+ * DestroyFilter: destroy logo video filter
+ *****************************************************************************/
+static void DestroyFilter( vlc_object_t *p_this )
+{
+    filter_t *p_filter = (filter_t *)p_this;
+    filter_sys_t *p_sys = p_filter->p_sys;
+
+    free( p_sys );
+}
+
+char *myCtime( time_t *t )
+{
+#ifdef HAVE_CTIME_R
+    char tmp[27];
+    ctime_r( t, tmp );
+    return strdup( tmp );
+#else
+    return strdup(ctime(t));
+#endif
+}
+
+/****************************************************************************
+ * Filter: the whole thing
+ ****************************************************************************
+ * This function outputs subpictures at regular time intervals.
+ ****************************************************************************/
+static subpicture_t *Filter( filter_t *p_filter, mtime_t date )
+{
+    filter_sys_t *p_sys = p_filter->p_sys;
+    subpicture_t *p_spu;
+    subpicture_region_t *p_region;
+    video_format_t fmt;
+    time_t t;
+    p_spu = p_filter->pf_sub_buffer_new( p_filter );
+    if( !p_spu ) return NULL;
+    
+    memset( &fmt, 0, sizeof(video_format_t) );
+    fmt.i_chroma = VLC_FOURCC('T','E','X','T');
+    fmt.i_aspect = 0;
+    fmt.i_width = fmt.i_height = 0;
+    fmt.i_x_offset = fmt.i_y_offset = 0;
+    
+    p_spu->p_region = p_spu->pf_create_region( VLC_OBJECT(p_filter), &fmt );
+    if( !p_spu->p_region )
+    {
+        p_filter->pf_sub_buffer_del( p_filter, p_spu );
+        return NULL;
+    }
+    t = time(NULL);
+    p_spu->p_region->psz_text = myCtime(&t);
+    p_spu->i_start = date;
+    p_spu->i_stop  = date + 1000000;
+    p_spu->b_ephemer = VLC_TRUE;
+    p_spu->b_absolute = VLC_FALSE;
+    p_spu->i_x = 10;
+    p_spu->i_y = 10;
+    p_spu->i_flags = 0;
+    return p_spu;
+}