* modules/codec/fake.c: New fake codec. Use it in conjunction with the

   fake access to create an efficient background image for the transcode
   module (avoids using the switcher module).

configure.ac

@@ -986,7 +986,7 @@ VLC_ADD_PLUGINS([packetizer_mpeg4video packetizer_mpeg4audio])
 if test "${SYS}" != "mingwce"; then
 dnl  VLC_ADD_PLUGINS([externrun])
   VLC_ADD_PLUGINS([access_fake access_filter_timeshift access_filter_record])
-  VLC_ADD_PLUGINS([gestures rc telnet hotkeys netsync showintf time marq sap shout])
+  VLC_ADD_PLUGINS([gestures rc telnet hotkeys netsync showintf time marq sap shout fake])
   VLC_ADD_PLUGINS([mosaic wall motiondetect clone crop])
   VLC_ADD_PLUGINS([i420_yuy2 i422_yuy2 i420_ymga])
   VLC_ADD_PLUGINS([aout_file linear_resampler bandlimited_resampler])

modules/codec/Modules.am

@@ -25,3 +25,4 @@ SOURCES_dirac = dirac.c
 SOURCES_png = png.c
 SOURCES_svcdsub = svcdsub.c
 SOURCES_cvdsub = cvdsub.c
+SOURCES_fake = fake.c

modules/codec/fake.c

+/*****************************************************************************
+ * fake.c: decoder reading from a fake stream, outputting a fixed image
+ *****************************************************************************
+ * Copyright (C) 2005 VideoLAN
+ * $Id$
+ *
+ * Authors: Christophe Massiot <massiot@via.ecp.fr>
+ *
+ * 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_image.h"
+
+/*****************************************************************************
+ * decoder_sys_t : fake decoder descriptor
+ *****************************************************************************/
+struct decoder_sys_t
+{
+    picture_t *p_image;
+};
+
+/*****************************************************************************
+ * Local prototypes
+ *****************************************************************************/
+static int  OpenDecoder   ( vlc_object_t * );
+static void CloseDecoder  ( vlc_object_t * );
+
+static picture_t *DecodeBlock  ( decoder_t *, block_t ** );
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+#define FILE_TEXT N_("Image file")
+#define FILE_LONGTEXT N_( \
+    "Path of the image file when using the fake input." )
+#define ASPECT_RATIO_TEXT N_("Background aspect ratio")
+#define ASPECT_RATIO_LONGTEXT N_( \
+    "Aspect ratio of the image file (4:3, 16:9)." )
+
+vlc_module_begin();
+    set_category( CAT_INPUT );
+    set_subcategory( SUBCAT_INPUT_VCODEC );
+    set_description( _("fake video decoder") );
+    set_capability( "decoder", 1000 );
+    set_callbacks( OpenDecoder, CloseDecoder );
+    add_shortcut( "fake" );
+
+    add_string( "fake-file", "", NULL, FILE_TEXT,
+                FILE_LONGTEXT, VLC_TRUE );
+    add_string( "fake-aspect-ratio", "4:3", NULL,
+                ASPECT_RATIO_TEXT, ASPECT_RATIO_LONGTEXT, VLC_FALSE );
+vlc_module_end();
+
+/*****************************************************************************
+ * OpenDecoder: probe the decoder and return score
+ *****************************************************************************/
+static int OpenDecoder( vlc_object_t *p_this )
+{
+    decoder_t *p_dec = (decoder_t*)p_this;
+    decoder_sys_t *p_sys;
+    vlc_value_t val;
+
+    if( p_dec->fmt_in.i_codec != VLC_FOURCC('f','a','k','e') )
+    {
+        return VLC_EGENERIC;
+    }
+
+    /* Allocate the memory needed to store the decoder's structure */
+    if( ( p_dec->p_sys = p_sys =
+          (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
+    {
+        msg_Err( p_dec, "out of memory" );
+        return VLC_EGENERIC;
+    }
+
+    var_Create( p_dec, "fake-file", VLC_VAR_STRING | VLC_VAR_DOINHERIT );
+    var_Get( p_dec, "fake-file", &val );
+    if( val.psz_string != NULL && *val.psz_string )
+    {
+        image_handler_t *p_handler = image_HandlerCreate( p_dec );
+        video_format_t fmt_in, fmt_out;
+
+        memset( &fmt_in, 0, sizeof(fmt_in) );
+        memset( &fmt_out, 0, sizeof(fmt_out) );
+        fmt_out.i_chroma = VLC_FOURCC('Y', 'V', '1', '2');
+        p_sys->p_image = image_ReadUrl( p_handler, val.psz_string,
+                                        &fmt_in, &fmt_out );
+        image_HandlerDelete( p_handler );
+
+        if( p_sys->p_image == NULL )
+        {
+            msg_Err( p_dec, "unable to read image file %s", val.psz_string );
+            free( p_dec->p_sys );
+            return VLC_EGENERIC;
+        }
+        msg_Dbg( p_dec, "file %s loaded successfully", val.psz_string );
+        p_dec->fmt_out.video = fmt_out;
+    }
+    if( val.psz_string ) free( val.psz_string );
+
+    var_Create( p_dec, "fake-aspect-ratio",
+                VLC_VAR_STRING | VLC_VAR_DOINHERIT );
+    var_Get( p_dec, "fake-aspect-ratio", &val );
+    if ( val.psz_string )
+    {
+        char *psz_parser = strchr( val.psz_string, ':' );
+
+        if( psz_parser )
+        {
+            *psz_parser++ = '\0';
+            p_dec->fmt_out.video.i_aspect = atoi( val.psz_string )
+                                   * VOUT_ASPECT_FACTOR / atoi( psz_parser );
+        }
+        else
+        {
+            msg_Warn( p_dec, "bad aspect ratio %s", val.psz_string );
+            p_dec->fmt_out.video.i_aspect = 4 * VOUT_ASPECT_FACTOR / 3;
+        }
+
+        free( val.psz_string );
+    }
+    else
+    {
+        p_dec->fmt_out.video.i_aspect = 4 * VOUT_ASPECT_FACTOR / 3;
+    }
+
+    /* Set output properties */
+    p_dec->fmt_out.i_cat = VIDEO_ES;
+    p_dec->fmt_out.i_codec = VLC_FOURCC('Y','V','1','2');
+
+    /* Set callbacks */
+    p_dec->pf_decode_video = DecodeBlock;
+
+    return VLC_SUCCESS;
+}
+
+/****************************************************************************
+ * DecodeBlock: the whole thing
+ ****************************************************************************/
+static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
+{
+    decoder_sys_t *p_sys = p_dec->p_sys;
+    picture_t *p_pic;
+
+    if( pp_block == NULL || !*pp_block ) return NULL;
+    p_pic = p_dec->pf_vout_buffer_new( p_dec );
+    if( p_pic == NULL )
+    {
+        msg_Err( p_dec, "cannot get picture" );
+        goto error;
+    }
+
+    vout_CopyPicture( p_dec, p_pic, p_sys->p_image );
+    p_pic->date = (*pp_block)->i_pts;
+
+error:
+    block_Release( *pp_block );
+    *pp_block = NULL;
+
+    return p_pic;
+}
+
+/*****************************************************************************
+ * CloseDecoder: fake decoder destruction
+ *****************************************************************************/
+static void CloseDecoder( vlc_object_t *p_this )
+{
+    decoder_t *p_dec = (decoder_t *)p_this;
+    decoder_sys_t *p_sys = p_dec->p_sys;
+
+    if( p_sys->p_image != NULL )
+        p_sys->p_image->pf_release( p_sys->p_image );
+    free( p_sys );
+}