tools/gst-element-maker

#!/bin/sh


prefix=gst
basedir=`dirname $0`
templatedir=$basedir/element-templates

while [ "$1" ] ; do
  case $1 in
    --help)
      cat <<-EOF
Usage: element-maker [OPTIONS] ELEMENT_NAME BASE_CLASS
Create a GStreamer element that subclasses BASE_CLASS.
Options:
  --help             Print this information
  --prefix PREFIX    Use PREFIX instead of "gst"
Example: 'element-maker my_element basetransform' will create the files
  gstmyelement.c and gstmyelement.h that implement GstMyElement, a
  subclass of GstBaseTransform, as an element named myelement.
EOF
      exit 0
      ;;
    --prefix)
      shift
      prefix=$1
      ;;
    -*)
      echo Unknown option: $1
      exit 1
      ;;
    *)
      if [ "$name" = "" ]; then
        name=$1
      elif [ "$class" = "" ]; then
        class=$1
      else
        echo Ignored: $1
      fi
  esac
  shift
done

if [ "$name" = "" -o "$class" = "" ] ; then
  echo "Usage: element-maker [OPTIONS] ELEMENT_NAME BASE_CLASS"
  exit 1
fi

if [ ! -f "$templatedir/$class" ] ; then
  echo "Template file for $class not found."
  exit 1
fi


PREFIX=$(echo $prefix | sed -e 's/\(.*\)/\U\1/')
NAME=$(echo $name | sed -e 's/\(.*\)/\U\1/')
Prefix=$(echo $prefix | sed -e 's/_\(.\)/\U\1/g' -e 's/^\(.\)/\U\1/')
Name=$(echo $name | sed -e 's/_\(.\)/\U\1/g' -e 's/^\(.\)/\U\1/')
name=$(echo $name | sed -e 's/\(.*\)/\L\1/')

GST_IS_REPLACE=${PREFIX}_IS_${NAME}
GST_REPLACE=${PREFIX}_${NAME}
GST_TYPE_REPLACE=${PREFIX}_TYPE_${NAME}
GstReplace=${Prefix}${Name}
gst_replace=${prefix}_${name}
gstreplace=${prefix}$(echo $name | sed -e 's/_//g')
replace=$(echo $name | sed -e 's/_//g')
if [ "${prefix}" = gst ] ; then
  prefixreplace=$replace
else
  prefixreplace=$gstreplace
fi

if [ "$REAL_NAME" = "" ] ; then
  REAL_NAME=FIXME
fi
if [ "$EMAIL_ADDRESS" = "" ] ; then
  EMAIL_ADDRESS=fixme@example.com
fi


pkg=`grep -A 10000 '^% pkg-config' $templatedir/$class | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1`
GST_TYPE_BASE_REPLACE=`grep -A 10000 '^% TYPE_CLASS_NAME' $templatedir/$class | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1`
GstBaseReplace=`grep -A 10000 '^% ClassName' $templatedir/$class | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1`
pads=`grep -A 10000 '^% pads' $templatedir/$class | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1`

generate ()
{

cat <<-EOF
/* GStreamer
 * Copyright (C) $(date +%Y) $REAL_NAME <$EMAIL_ADDRESS>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Suite 500,
 * Boston, MA 02110-1335, USA.
 */
EOF

cat <<-EOF
/**
 * SECTION:element-$gstreplace
 *
 * The $replace element does FIXME stuff.
 *
 * <refsect2>
 * <title>Example launch line</title>
 * |[
 * gst-launch-1.0 -v fakesrc ! $replace ! FIXME ! fakesink
 * ]|
 * FIXME Describe what the pipeline does.
 * </refsect2>
 */
EOF


cat <<EOF

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <gst/gst.h>
EOF

grep -A 10000 '^% includes' $templatedir/gobject | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
grep -A 10000 '^% includes' $templatedir/$class | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1

cat <<EOF
#include "gstreplace.h"

GST_DEBUG_CATEGORY_STATIC (gst_replace_debug_category);
#define GST_CAT_DEFAULT gst_replace_debug_category

/* prototypes */

EOF

grep -A 10000 '^% prototypes' $templatedir/gobject | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
grep -A 10000 '^% prototypes' $templatedir/$class | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
for each in $pads
do
  grep -A 10000 '^% prototypes' $templatedir/$each | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
done

cat <<EOF

enum
{
  PROP_0
};

/* pad templates */

EOF

for each in $pads
do
  grep -A 10000 '^% pad-template' $templatedir/$each | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
done

cat <<EOF

/* class initialization */

G_DEFINE_TYPE_WITH_CODE (GstReplace, gst_replace, GST_TYPE_BASE_REPLACE,
  GST_DEBUG_CATEGORY_INIT (gst_replace_debug_category, "prefixreplace", 0,
  "debug category for replace element"));

static void
gst_replace_class_init (GstReplaceClass * klass)
{
EOF
grep -A 10000 '^% declare-class' $templatedir/gobject | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
grep -A 10000 '^% declare-class' $templatedir/$class | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1

cat <<EOF

  /* Setting up pads and setting metadata should be moved to
     base_class_init if you intend to subclass this class. */
EOF
for each in $pads
do
  grep -A 10000 '^% base-init' $templatedir/$each | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
done
cat <<EOF

  gst_element_class_set_static_metadata (GST_ELEMENT_CLASS(klass),
      "FIXME Long name", "Generic", "FIXME Description",
      "$REAL_NAME <$EMAIL_ADDRESS>");

EOF

grep -A 10000 '^% set-methods' $templatedir/gobject | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
grep -A 10000 '^% set-methods' $templatedir/$class | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1

cat <<EOF

}

static void
gst_replace_init (GstReplace *replace)
{
EOF

for each in $pads
do
  grep -A 10000 '^% instance-init' $templatedir/$each | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
done


cat <<EOF
}
EOF


grep -A 10000 '^% methods' $templatedir/gobject | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
grep -A 10000 '^% methods' $templatedir/$class | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
for each in $pads
do
  grep -A 10000 '^% methods' $templatedir/$each | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
done


cat <<EOF

static gboolean
plugin_init (GstPlugin * plugin)
{

  /* FIXME Remember to set the rank if it's an element that is meant
     to be autoplugged by decodebin. */
  return gst_element_register (plugin, "prefixreplace", GST_RANK_NONE,
      GST_TYPE_REPLACE);
}

/* FIXME: these are normally defined by the GStreamer build system.
   If you are creating an element to be included in gst-plugins-*,
   remove these, as they're always defined.  Otherwise, edit as
   appropriate for your external plugin package. */
#ifndef VERSION
#define VERSION "0.0.FIXME"
#endif
#ifndef PACKAGE
#define PACKAGE "FIXME_package"
#endif
#ifndef PACKAGE_NAME
#define PACKAGE_NAME "FIXME_package_name"
#endif
#ifndef GST_PACKAGE_ORIGIN
#define GST_PACKAGE_ORIGIN "http://FIXME.org/"
#endif

GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
    GST_VERSION_MINOR,
    replace,
    "FIXME plugin description",
    plugin_init, VERSION, "LGPL", PACKAGE_NAME, GST_PACKAGE_ORIGIN)

EOF


}

generate_header ()
{

cat <<-EOF
/* GStreamer
 * Copyright (C) $(date +%Y) $REAL_NAME <$EMAIL_ADDRESS>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

EOF

cat <<EOF
#ifndef _GST_REPLACE_H_
#define _GST_REPLACE_H_

EOF

grep -A 10000 '^% includes' $templatedir/gobject | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
grep -A 10000 '^% includes' $templatedir/$class | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1

cat <<EOF

G_BEGIN_DECLS

#define GST_TYPE_REPLACE \
  (gst_replace_get_type())
#define GST_REPLACE(obj) \
  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_REPLACE,GstReplace))
#define GST_REPLACE_CLASS(klass) \
  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_REPLACE,GstReplaceClass))
#define GST_IS_REPLACE(obj) \
  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_REPLACE))
#define GST_IS_REPLACE_CLASS(obj) \
  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_REPLACE))

typedef struct _GstReplace GstReplace;
typedef struct _GstReplaceClass GstReplaceClass;

struct _GstReplace
{
  GstBaseReplace base_replace;

EOF

for each in $pads
do
  grep -A 10000 '^% instance-members' $templatedir/$each | tail -n +2|grep -m 1 -B 10000 '^%'|head -n -1
done

cat <<EOF
};

struct _GstReplaceClass
{
  GstBaseReplaceClass base_replace_class;
};

GType gst_replace_get_type (void);

G_END_DECLS

#endif
EOF


}


generate | sed \
  -e "s/GST_BASE_REPLACE/$GST_BASE_REPLACE/g" \
  -e "s/GST_TYPE_BASE_REPLACE/$GST_TYPE_BASE_REPLACE/g" \
  -e "s/GstBaseReplace/$GstBaseReplace/g" \
  -e "s/GST_IS_REPLACE/$GST_IS_REPLACE/g" \
  -e "s/GST_REPLACE/$GST_REPLACE/g" \
  -e "s/GST_TYPE_REPLACE/$GST_TYPE_REPLACE/g" \
  -e "s/GstReplace/$GstReplace/g" \
  -e "s/gst_replace/$gst_replace/g" \
  -e "s/gstreplace/$gstreplace/g" \
  -e "s/prefixreplace/$prefixreplace/g" \
  -e "s/replace/$replace/g" >$gstreplace.c

generate_header | sed \
  -e "s/GST_BASE_REPLACE/$GST_BASE_REPLACE/g" \
  -e "s/GST_TYPE_BASE_REPLACE/$GST_TYPE_BASE_REPLACE/g" \
  -e "s/GstBaseReplace/$GstBaseReplace/g" \
  -e "s/GST_IS_REPLACE/$GST_IS_REPLACE/g" \
  -e "s/GST_REPLACE/$GST_REPLACE/g" \
  -e "s/GST_TYPE_REPLACE/$GST_TYPE_REPLACE/g" \
  -e "s/GstReplace/$GstReplace/g" \
  -e "s/gst_replace/$gst_replace/g" \
  -e "s/gstreplace/$gstreplace/g" \
  -e "s/prefixreplace/$prefixreplace/g" \
  -e "s/replace/$replace/g" >$gstreplace.h

gst-indent $gstreplace.c

echo pkg is $pkg

gcc -Wall -Werror -fPIC $CPPFLAGS $(pkg-config --cflags gstreamer-1.0 $pkg) -c -o $gstreplace.o $gstreplace.c
if test $? -ne 0; then
    exit 1
fi

gcc -shared -o $gstreplace.so $gstreplace.o $(pkg-config --libs gstreamer-1.0 $pkg)
if test $? -ne 0; then
    exit 1
fi

gst-inspect-1.0 ./$gstreplace.so