* modules/video_filter/scale.c: simple nearest neighbour rescaling module for YUVP/A (subpictures).

configure.ac

@@ -954,7 +954,7 @@ VLC_ADD_PLUGINS([trivial_mixer spdif_mixer float32_mixer])
 VLC_ADD_PLUGINS([aout_file equalizer])
 VLC_ADD_PLUGINS([i420_rgb i420_yuy2 i422_yuy2 i420_ymga])
 VLC_ADD_PLUGINS([m3u id3 playlist export sgimb])
-VLC_ADD_PLUGINS([rawvideo blend])
+VLC_ADD_PLUGINS([rawvideo blend scale])
 VLC_ADD_PLUGINS([wav araw subtitle adpcm a52sys dtssys au])
 VLC_ADD_PLUGINS([access_file access_udp access_tcp access_http ipv4 access_mms])
 VLC_ADD_PLUGINS([access_ftp access_directory sap http])

modules/video_filter/Modules.am

@@ -9,4 +9,5 @@ SOURCES_motionblur = motionblur.c
 SOURCES_logo = logo.c
 SOURCES_deinterlace = deinterlace.c
 SOURCES_blend = blend.c
+SOURCES_blend = scale.c
 noinst_HEADERS += filter_common.h

modules/video_filter/scale.c

+/*****************************************************************************
+ * resize.c: video scaling module for YUVP/A pictures
+ *  Uses the low quality "nearest neighbour" algorithm.
+ *****************************************************************************
+ * Copyright (C) 2003 VideoLAN
+ * $Id$
+ *
+ * Author: Gildas Bazin <gbazin@videolan.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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Preamble
+ *****************************************************************************/
+#include <vlc/vlc.h>
+#include <vlc/decoder.h>
+#include "vlc_filter.h"
+
+/*****************************************************************************
+ * filter_sys_t : filter descriptor
+ *****************************************************************************/
+struct filter_sys_t
+{
+    es_format_t fmt_in;
+    es_format_t fmt_out;
+};
+
+/****************************************************************************
+ * Local prototypes
+ ****************************************************************************/
+static int  OpenFilter ( vlc_object_t * );
+static void CloseFilter( vlc_object_t * );
+
+static picture_t *Filter( filter_t *, picture_t * );
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+vlc_module_begin();
+    set_description( _("Video scaling filter") );
+    set_capability( "video filter2", 10000 );
+    set_callbacks( OpenFilter, CloseFilter );
+vlc_module_end();
+
+/*****************************************************************************
+ * OpenFilter: probe the filter and return score
+ *****************************************************************************/
+static int OpenFilter( vlc_object_t *p_this )
+{
+    filter_t *p_filter = (filter_t*)p_this;
+    filter_sys_t *p_sys;
+
+    if( ( p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','U','V','P') &&
+          p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','U','V','A') ) ||
+        p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
+    {
+        return VLC_EGENERIC;
+    }
+
+    /* Allocate the memory needed to store the decoder's structure */
+    if( ( p_filter->p_sys = p_sys =
+          (filter_sys_t *)malloc(sizeof(filter_sys_t)) ) == NULL )
+    {
+        msg_Err( p_filter, "out of memory" );
+        return VLC_EGENERIC;
+    }
+
+    p_filter->pf_video_filter = Filter;
+
+    msg_Dbg( p_filter, "%ix%i -> %ix%i", p_filter->fmt_in.video.i_width,
+             p_filter->fmt_in.video.i_height, p_filter->fmt_out.video.i_width,
+             p_filter->fmt_out.video.i_height );
+
+    return VLC_SUCCESS;
+}
+
+/*****************************************************************************
+ * CloseFilter: clean up the filter
+ *****************************************************************************/
+static void CloseFilter( 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 );
+}
+
+/****************************************************************************
+ * Filter: the whole thing
+ ****************************************************************************/
+static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
+{
+    filter_sys_t *p_sys = p_filter->p_sys;
+    picture_t *p_pic_dst;
+    int i_plane, i, j, k, l;
+
+    /* Request output picture */
+    p_pic_dst = p_filter->pf_vout_buffer_new( p_filter );
+    if( !p_pic_dst )
+    {
+        msg_Warn( p_filter, "can't get output picture" );
+        return NULL;
+    }
+
+    for( i_plane = 0; i_plane < p_pic_dst->i_planes; i_plane++ )
+    {
+        uint8_t *p_src = p_pic->p[i_plane].p_pixels;
+        uint8_t *p_dst = p_pic_dst->p[i_plane].p_pixels;
+        int i_src_pitch = p_pic->p[i_plane].i_pitch;
+        int i_dst_pitch = p_pic_dst->p[i_plane].i_pitch;
+
+        for( i = 0; i < p_pic_dst->p[i_plane].i_visible_lines; i++ )
+        {
+            l = p_filter->fmt_in.video.i_height * i /
+                p_filter->fmt_out.video.i_height;
+
+            for( j = 0; j < p_pic_dst->p[i_plane].i_visible_pitch; j++ )
+            {
+                k = p_filter->fmt_in.video.i_width * j /
+                    p_filter->fmt_out.video.i_width;
+
+                p_dst[i * i_dst_pitch + j] = p_src[l * i_src_pitch + k];
+            }
+        }
+    }
+
+    p_pic_dst->date = p_pic->date;
+    p_pic_dst->b_force = p_pic->b_force;
+    p_pic_dst->i_nb_fields = p_pic->i_nb_fields;
+    p_pic_dst->b_progressive = p_pic->b_progressive;
+    p_pic_dst->b_top_field_first = p_pic->b_top_field_first;
+
+    p_pic->pf_release( p_pic );
+    return p_pic_dst;
+}