Re: [gst-devel] Building boilerplate plugin on ubuntu hardy

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My understanding is that the automatically generated Makefile treats warning as erros.
You can try to find the “-Werror” in the Makefile and remove it.
Then it will compile successfully. Have a try.

Best Regards, Zheng, Huan(ZBT)
OTC/SSD/SSG
Intel Aisa-Pacific Research & Developement Ltd
Tel: 021-6116 6435
Inet: 8821 6435
Cub: 3W035
________________________________
From: Jon Burgess [mailto:jkb...@gm...]
Sent: 2008年10月27日 15:04
To: gst...@li...
Subject: [gst-devel] Building boilerplate plugin on ubuntu hardy

Hi all,

I'm just running through the plugin writer's guide (http://gstreamer.freedesktop.org/data/doc/gstreamer/head/pwg/html/index.html), specifically the section about building a plugin from generated boilerplate code, and having trouble compiling it.

I have done the following steps:
1. Checked out gst-template from cvs
2. Generated example filter from template:

> cd gst-template/gst-plugin/src
> ../tools/make_element ExampleFilter

This created the .c and .h files as expected.

Without making any further changes to the source (since I just want to compile the basic plugin):

3. added the *.c and *.h to src/Makefile.am, so it looks like:

# plugindir is set in configure

##############################################################################
# change libgstplugin.la<http://libgstplugin.la> to something more suitable, e.g. libmysomething.la<http://libmysomething.la>  #
##############################################################################
plugin_LTLIBRARIES = libgstplugin.la<http://libgstplugin.la>

##############################################################################
# for the next set of variables, rename the prefix if you renamed the .la,   #
#  e.g. libgstplugin_la_SOURCES => libmysomething_la_SOURCES                 #
#       libgstplugin_la_CFLAGS  => libmysomething_la_CFLAGS                  #
#       libgstplugin_la_LIBADD  => libmysomething_la_LIBADD                  #
#       libgstplugin_la_LDFLAGS => libmysomething_la_LDFLAGS                 #
##############################################################################

# sources used to compile this plug-in
libgstplugin_la_SOURCES = gstplugin.c gstexamplefilter.c

# flags used to compile this plugin
# add other _CFLAGS and _LIBS as needed
libgstplugin_la_CFLAGS = $(GST_CFLAGS)
libgstplugin_la_LIBADD = $(GST_LIBS)
libgstplugin_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)

# headers we need but don't want installed
noinst_HEADERS = gstplugin.h gstexamplefilter.h

4. Run autogen.sh, all good still.
5. make - error compiling gstexamplefilter.c:

$ make
cd . && /bin/bash /space/playpen/gst-template/gst-plugin/missing --run autoheader
touch ./config.h.in<http://config.h.in>
cd . && /bin/bash ./config.status config.h
config.status: creating config.h
config.status: config.h is unchanged
make  all-recursive
make[1]: Entering directory `/space/playpen/gst-template/gst-plugin'
Making all in m4
make[2]: Entering directory `/space/playpen/gst-template/gst-plugin/m4'
make[2]: Nothing to be done for `all'.
make[2]: Leaving directory `/space/playpen/gst-template/gst-plugin/m4'
Making all in src
make[2]: Entering directory `/space/playpen/gst-template/gst-plugin/src'
if /bin/bash ../libtool --mode=compile gcc -DHAVE_CONFIG_H -I. -I. -I..    -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/libxml2    -Wall -Werror -g -O2 -MT libgstplugin_la-gstplugin.lo -MD -MP -MF ".deps/libgstplugin_la-gstplugin.Tpo" \
      -c -o libgstplugin_la-gstplugin.lo `test -f 'gstplugin.c' || echo './'`gstplugin.c; \
    then mv -f ".deps/libgstplugin_la-gstplugin.Tpo" ".deps/libgstplugin_la-gstplugin.Plo"; \
    else rm -f ".deps/libgstplugin_la-gstplugin.Tpo"; exit 1; \
    fi
 gcc -DHAVE_CONFIG_H -I. -I. -I.. -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/libxml2 -Wall -Werror -g -O2 -MT libgstplugin_la-gstplugin.lo -MD -MP -MF .deps/libgstplugin_la-gstplugin.Tpo -c gstplugin.c  -fPIC -DPIC -o .libs/libgstplugin_la-gstplugin.o
 gcc -DHAVE_CONFIG_H -I. -I. -I.. -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/libxml2 -Wall -Werror -g -O2 -MT libgstplugin_la-gstplugin.lo -MD -MP -MF .deps/libgstplugin_la-gstplugin.Tpo -c gstplugin.c -o libgstplugin_la-gstplugin.o >/dev/null 2>&1
if /bin/bash ../libtool --mode=compile gcc -DHAVE_CONFIG_H -I. -I. -I..    -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/libxml2    -Wall -Werror -g -O2 -MT libgstplugin_la-gstexamplefilter.lo -MD -MP -MF ".deps/libgstplugin_la-gstexamplefilter.Tpo" \
      -c -o libgstplugin_la-gstexamplefilter.lo `test -f 'gstexamplefilter.c' || echo './'`gstexamplefilter.c; \
    then mv -f ".deps/libgstplugin_la-gstexamplefilter.Tpo" ".deps/libgstplugin_la-gstexamplefilter.Plo"; \
    else rm -f ".deps/libgstplugin_la-gstexamplefilter.Tpo"; exit 1; \
    fi
 gcc -DHAVE_CONFIG_H -I. -I. -I.. -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/libxml2 -Wall -Werror -g -O2 -MT libgstplugin_la-gstexamplefilter.lo -MD -MP -MF .deps/libgstplugin_la-gstexamplefilter.Tpo -c gstexamplefilter.c  -fPIC -DPIC -o .libs/libgstplugin_la-gstexamplefilter.o
cc1: warnings being treated as errors
gstexamplefilter.c: In function 'examplefilter_init':
gstexamplefilter.c:254: warning: passing argument 1 of 'gst_element_register' from incompatible pointer type
gstexamplefilter.c: At top level:
gstexamplefilter.c:261: warning: initialization from incompatible pointer type
make[2]: *** [libgstplugin_la-gstexamplefilter.lo] Error 1
make[2]: Leaving directory `/space/playpen/gst-template/gst-plugin/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/space/playpen/gst-template/gst-plugin'
make: *** [all] Error 2

Complete listing of gstexamplefilter.c at end of this post.

"gcc -v" gives:
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --with-gxx-include-dir=/usr/include/c++/4.2 --program-suffix=-4.2 --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --enable-mpfr --enable-targets=all --enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu
Thread model: posix
gcc version 4.2.4 (Ubuntu 4.2.4-1ubuntu3)

Is it a problem with my gcc being too recent and being stricter on warnings?  Please go easy on me, I haven't any experience with gtk and little with c :-)

Thanks in advance,
Jono

gstexamplefilter.c:
/*
 * GStreamer
 * Copyright (C) 2005 Thomas Vander Stichele <th...@ap...<mailto:th...@ap...>>
 * Copyright (C) 2005 Ronald S. Bultje <rb...@ro...<mailto:rb...@ro...>>
 * Copyright (C) 2008 Jon Burgess <<us...@ho...<mailto:us...@ho...>>>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Alternatively, the contents of this file may be used under the
 * GNU Lesser General Public License Version 2.1 (the "LGPL"), in
 * which case the following provisions apply instead of the ones
 * mentioned above:
 *
 * 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/**
 * SECTION:element-examplefilter
 *
 * FIXME:Describe examplefilter here.
 *
 * <refsect2>
 * <title>Example launch line</title>
 * |[
 * gst-launch -v -m fakesrc ! examplefilter ! fakesink silent=TRUE
 * ]|
 * </refsect2>
 */

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

#include <gst/gst.h>

#include "gstexamplefilter.h"

GST_DEBUG_CATEGORY_STATIC (gst_example_filter_debug);
#define GST_CAT_DEFAULT gst_example_filter_debug

/* Filter signals and args */
enum
{
  /* FILL ME */
  LAST_SIGNAL
};

enum
{
  PROP_0,
  PROP_SILENT
};

/* the capabilities of the inputs and outputs.
 *
 * describe the real formats here.
 */
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("ANY")
    );

static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("ANY")
    );

GST_BOILERPLATE (GstExampleFilter, gst_example_filter, GstElement,
    GST_TYPE_ELEMENT);

static void gst_example_filter_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec);
static void gst_example_filter_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec);

static gboolean gst_example_filter_set_caps (GstPad * pad, GstCaps * caps);
static GstFlowReturn gst_example_filter_chain (GstPad * pad, GstBuffer * buf);

/* GObject vmethod implementations */

static void
gst_example_filter_base_init (gpointer gclass)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (gclass);

  gst_element_class_set_details_simple(element_class,
    "ExampleFilter",
    "FIXME:Generic",
    "FIXME:Generic Template Element",
    "Jon Burgess <<us...@ho...<mailto:us...@ho...>>>");

  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&src_factory));
  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&sink_factory));
}

/* initialize the examplefilter's class */
static void
gst_example_filter_class_init (GstExampleFilterClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;

  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;

  gobject_class->set_property = gst_example_filter_set_property;
  gobject_class->get_property = gst_example_filter_get_property;

  g_object_class_install_property (gobject_class, PROP_SILENT,
      g_param_spec_boolean ("silent", "Silent", "Produce verbose output ?",
          FALSE, G_PARAM_READWRITE));
}

/* initialize the new element
 * instantiate pads and add them to element
 * set pad calback functions
 * initialize instance structure
 */
static void
gst_example_filter_init (GstExampleFilter * filter,
    GstExampleFilterClass * gclass)
{
  filter->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");
  gst_pad_set_setcaps_function (filter->sinkpad,
                                GST_DEBUG_FUNCPTR(gst_example_filter_set_caps));
  gst_pad_set_getcaps_function (filter->sinkpad,
                                GST_DEBUG_FUNCPTR(gst_pad_proxy_getcaps));
  gst_pad_set_chain_function (filter->sinkpad,
                              GST_DEBUG_FUNCPTR(gst_example_filter_chain));

  filter->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
  gst_pad_set_getcaps_function (filter->srcpad,
                                GST_DEBUG_FUNCPTR(gst_pad_proxy_getcaps));

  gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
  gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
  filter->silent = FALSE;
}

static void
gst_example_filter_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec)
{
  GstExampleFilter *filter = GST_EXAMPLEFILTER (object);

  switch (prop_id) {
    case PROP_SILENT:
      filter->silent = g_value_get_boolean (value);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static void
gst_example_filter_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec)
{
  GstExampleFilter *filter = GST_EXAMPLEFILTER (object);

  switch (prop_id) {
    case PROP_SILENT:
      g_value_set_boolean (value, filter->silent);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

/* GstElement vmethod implementations */

/* this function handles the link with other elements */
static gboolean
gst_example_filter_set_caps (GstPad * pad, GstCaps * caps)
{
  GstExampleFilter *filter;
  GstPad *otherpad;

  filter = GST_EXAMPLEFILTER (gst_pad_get_parent (pad));
  otherpad = (pad == filter->srcpad) ? filter->sinkpad : filter->srcpad;
  gst_object_unref (filter);

  return gst_pad_set_caps (otherpad, caps);
}

/* chain function
 * this function does the actual processing
 */
static GstFlowReturn
gst_example_filter_chain (GstPad * pad, GstBuffer * buf)
{
  GstExampleFilter *filter;

  filter = GST_EXAMPLEFILTER (GST_OBJECT_PARENT (pad));

  if (filter->silent == FALSE)
    g_print ("I'm plugged, therefore I'm in.\n");

  /* just push out the incoming buffer without touching it */
  return gst_pad_push (filter->srcpad, buf);
}

/* entry point to initialize the plug-in
 * initialize the plug-in itself
 * register the element factories and other features
 */
static gboolean
examplefilter_init (GstExampleFilter * examplefilter)
{
  /* debug category for fltering log messages
   *
   * exchange the string 'Template examplefilter' with your description
   */
  GST_DEBUG_CATEGORY_INIT (gst_example_filter_debug, "examplefilter",
      0, "Template examplefilter");

  return gst_element_register (examplefilter, "examplefilter", GST_RANK_NONE,
      GST_TYPE_EXAMPLEFILTER);
}

/* gstreamer looks for this structure to register examplefilters
 *
 * exchange the string 'Template examplefilter' with your examplefilter description
 */
GST_PLUGIN_DEFINE (
    GST_VERSION_MAJOR,
    GST_VERSION_MINOR,
    "examplefilter",
    "Template examplefilter",
    examplefilter_init,
    VERSION,
    "LGPL",
    "GStreamer",
    "http://gstreamer.net/"
)

gstexamplefilter.h:
/*
 * GStreamer
 * Copyright (C) 2005 Thomas Vander Stichele <th...@ap...<mailto:th...@ap...>>
 * Copyright (C) 2005 Ronald S. Bultje <rb...@ro...<mailto:rb...@ro...>>
 * Copyright (C) 2008 Jon Burgess <<us...@ho...<mailto:us...@ho...>>>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Alternatively, the contents of this file may be used under the
 * GNU Lesser General Public License Version 2.1 (the "LGPL"), in
 * which case the following provisions apply instead of the ones
 * mentioned above:
 *
 * 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#ifndef __GST_EXAMPLEFILTER_H__
#define __GST_EXAMPLEFILTER_H__

#include <gst/gst.h>

G_BEGIN_DECLS

/* #defines don't like whitespacey bits */
#define GST_TYPE_EXAMPLEFILTER \
  (gst_example_filter_get_type())
#define GST_EXAMPLEFILTER(obj) \
  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_EXAMPLEFILTER,GstExampleFilter))
#define GST_EXAMPLEFILTER_CLASS(klass) \
  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_EXAMPLEFILTER,GstExampleFilterClass))
#define GST_IS_EXAMPLEFILTER(obj) \
  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_EXAMPLEFILTER))
#define GST_IS_EXAMPLEFILTER_CLASS(klass) \
  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_EXAMPLEFILTER))

typedef struct _GstExampleFilter      GstExampleFilter;
typedef struct _GstExampleFilterClass GstExampleFilterClass;

struct _GstExampleFilter
{
  GstElement element;

  GstPad *sinkpad, *srcpad;

  gboolean silent;
};

struct _GstExampleFilterClass
{
  GstElementClass parent_class;
};

GType gst_example_filter_get_type (void);

G_END_DECLS

#endif /* __GST_EXAMPLEFILTER_H__ */