GstVideofilter abstract class for video filters

Original commit message from CVS: GstVideofilter abstract class for video filters
2025-01-27 09:38:17 +00:00 · 2003-07-02 05:22:47 +00:00 · 2003-07-02 05:22:47 +00:00 · 8bbfd0c011
commit 8bbfd0c011
parent b24a690f25
2 changed files with 693 additions and 0 deletions
--- a/gst-libs/gst/video/gstvideofilter.c
+++ b/gst-libs/gst/video/gstvideofilter.c
@ -0,0 +1,584 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ * Copyright (C) <2003> David Schleef <ds@schleef.org>
+ *
+ * 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.
+ */
+
+
+/*#define DEBUG_ENABLED */
+#include <gstvideofilter.h>
+
+
+
+#if 0
+/* elementfactory information */
+static GstElementDetails videofilter_details = {
+  "Video scaler",
+  "Filter/Video",
+  "LGPL",
+  "Resizes video",
+  VERSION,
+  "David Schleef <ds@schleef.org>",
+  "(C) 2003",
+};
+#endif
+
+/* GstVideofilter signals and args */
+enum {
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum {
+  ARG_0,
+  ARG_METHOD,
+  /* FILL ME */
+};
+
+static void	gst_videofilter_class_init	(GstVideofilterClass *klass);
+static void	gst_videofilter_init		(GstVideofilter *videofilter);
+
+static void	gst_videofilter_set_property		(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
+static void	gst_videofilter_get_property		(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
+
+static void	gst_videofilter_chain		(GstPad *pad, GstBuffer *buf);
+GstCaps * gst_videofilter_class_get_capslist(GstVideofilterClass *klass);
+static void gst_videofilter_setup(GstVideofilter *videofilter);
+
+static GstElementClass *parent_class = NULL;
+
+GType
+gst_videofilter_get_type (void)
+{
+  static GType videofilter_type = 0;
+
+  if (!videofilter_type) {
+    static const GTypeInfo videofilter_info = {
+      sizeof(GstVideofilterClass),      NULL,
+      NULL,
+      (GClassInitFunc)gst_videofilter_class_init,
+      NULL,
+      NULL,
+      sizeof(GstVideofilter),
+      0,
+      (GInstanceInitFunc)gst_videofilter_init,
+    };
+    videofilter_type = g_type_register_static(GST_TYPE_ELEMENT,
+	"GstVideofilter", &videofilter_info, G_TYPE_FLAG_ABSTRACT);
+  }
+  return videofilter_type;
+}
+
+static void
+gst_videofilter_class_init (GstVideofilterClass *klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass*)klass;
+  gstelement_class = (GstElementClass*)klass;
+
+  parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
+
+  gobject_class->set_property = gst_videofilter_set_property;
+  gobject_class->get_property = gst_videofilter_get_property;
+
+  klass->formats = g_ptr_array_new();
+}
+
+#if 0
+static GstPadTemplate *
+gst_videofilter_src_template_factory(void)
+{
+  static GstPadTemplate *templ = NULL;
+
+  if(!templ){
+    GstCaps *caps = GST_CAPS_NEW("src","video/raw",
+		"width", GST_PROPS_INT_RANGE (0, G_MAXINT),
+		"height", GST_PROPS_INT_RANGE (0, G_MAXINT));
+
+    caps = gst_caps_intersect(caps, gst_videofilter_get_capslist ());
+
+    templ = GST_PAD_TEMPLATE_NEW("src", GST_PAD_SRC, GST_PAD_ALWAYS, caps);
+  }
+  return templ;
+}
+
+static GstPadTemplate *
+gst_videofilter_sink_template_factory(void)
+{
+  static GstPadTemplate *templ = NULL;
+
+  if(!templ){
+    GstCaps *caps = GST_CAPS_NEW("sink","video/raw",
+		"width", GST_PROPS_INT_RANGE (0, G_MAXINT),
+		"height", GST_PROPS_INT_RANGE (0, G_MAXINT));
+
+    caps = gst_caps_intersect(caps, gst_videofilter_get_capslist ());
+
+    templ = GST_PAD_TEMPLATE_NEW("src", GST_PAD_SINK, GST_PAD_ALWAYS, caps);
+  }
+  return templ;
+}
+#endif
+
+static GstCaps *gst_videofilter_format_get_caps(GstVideofilterFormat *format)
+{
+  unsigned int fourcc;
+  GstCaps *caps;
+
+  if(format->filter_func==NULL)
+    return NULL;
+
+  fourcc = GST_MAKE_FOURCC(format->fourcc[0],format->fourcc[1],format->fourcc[2],format->fourcc[3]);
+
+  if(format->bpp){
+    caps = GST_CAPS_NEW ("videoflip", "video/raw",
+		"format", GST_PROPS_FOURCC (fourcc),
+		"depth", GST_PROPS_INT(format->bpp),
+		"bpp", GST_PROPS_INT(format->depth),
+		"endianness", GST_PROPS_INT(format->endianness),
+		"red_mask", GST_PROPS_INT(format->red_mask),
+		"green_mask", GST_PROPS_INT(format->green_mask),
+		"blue_mask", GST_PROPS_INT(format->blue_mask));
+  }else{
+    caps = GST_CAPS_NEW ("videoflip", "video/raw",
+		"format", GST_PROPS_FOURCC (fourcc));
+  }
+
+  return caps;
+}
+
+GstCaps * gst_videofilter_class_get_capslist(GstVideofilterClass *klass)
+{
+  static GstCaps *capslist = NULL;
+  GstCaps *caps;
+  int i;
+
+  if (capslist){
+    gst_caps_ref(capslist);
+    return capslist;
+  }
+
+  for(i=0;i<klass->formats->len;i++){
+    caps = gst_videofilter_format_get_caps(g_ptr_array_index(klass->formats,i));
+    capslist = gst_caps_append(capslist, caps);
+  }
+
+  gst_caps_ref(capslist);
+  return capslist;
+}
+
+static GstCaps *
+gst_videofilter_sink_getcaps (GstPad *pad, GstCaps *caps)
+{
+  GstVideofilter *videofilter;
+  GstVideofilterClass *klass;
+  GstCaps *capslist = NULL;
+  GstCaps *peercaps;
+  GstCaps *sizecaps;
+  int i;
+
+  GST_DEBUG("gst_videofilter_sink_getcaps");
+  videofilter = GST_VIDEOFILTER (gst_pad_get_parent (pad));
+  
+  klass = GST_VIDEOFILTER_CLASS(G_OBJECT_GET_CLASS(videofilter));
+
+  /* get list of peer's caps */
+  peercaps = gst_pad_get_allowed_caps (videofilter->srcpad);
+  g_print("peercaps: %s\n", gst_caps_to_string(peercaps));
+
+  /* FIXME videofilter doesn't allow passthru of video formats it
+   * doesn't understand. */
+  /* Look through our list of caps and find those that match with
+   * the peer's formats.  Create a list of them. */
+  /* FIXME optimize if peercaps == NULL */
+  for(i=0;i<klass->formats->len;i++){
+    GstCaps *icaps;
+    GstCaps *fromcaps = gst_videofilter_format_get_caps(g_ptr_array_index(
+	  klass->formats,i));
+
+    g_print("testing caps: %s\n", gst_caps_to_string(fromcaps));
+
+    icaps = gst_caps_intersect(fromcaps, peercaps);
+    //if(gst_caps_is_always_compatible(fromcaps, peercaps)){
+    if(icaps != NULL){
+      capslist = gst_caps_append(capslist, fromcaps);
+      g_print("(yes)\n");
+    }else{
+      g_print("(no)\n");
+    }
+    //gst_caps_unref (fromcaps);
+    if(icaps) gst_caps_unref (icaps);
+  }
+  gst_caps_unref (peercaps);
+
+  sizecaps = GST_CAPS_NEW("videofilter_size","video/raw",
+		"width", GST_PROPS_INT_RANGE (0, G_MAXINT),
+		"height", GST_PROPS_INT_RANGE (0, G_MAXINT));
+
+  caps = gst_caps_intersect(capslist, sizecaps);
+  gst_caps_unref (sizecaps);
+
+  g_print("getcaps: %s\n",gst_caps_to_string(caps));
+
+  return caps;
+}
+
+static GstPadLinkReturn
+gst_videofilter_src_link (GstPad *pad, GstCaps *caps)
+{
+  GstVideofilter *videofilter;
+  GstPadLinkReturn ret;
+  GstCaps *peercaps;
+
+  GST_DEBUG("gst_videofilter_src_link");
+  videofilter = GST_VIDEOFILTER (gst_pad_get_parent (pad));
+
+  if (!GST_CAPS_IS_FIXED (caps)) {
+    return GST_PAD_LINK_DELAYED;
+  }
+
+  gst_caps_debug(caps,"ack");
+
+  videofilter->format = gst_videofilter_find_format_by_caps (videofilter,caps);
+  g_return_val_if_fail(videofilter->format, GST_PAD_LINK_REFUSED);
+
+  gst_caps_get_int (caps, "width", &videofilter->to_width);
+  gst_caps_get_int (caps, "height", &videofilter->to_height);
+
+  GST_DEBUG("width %d height %d",videofilter->to_width,videofilter->to_height);
+
+  peercaps = gst_caps_copy(caps);
+
+  gst_caps_set(peercaps, "width", GST_PROPS_INT_RANGE (0, G_MAXINT));
+  gst_caps_set(peercaps, "height", GST_PROPS_INT_RANGE (0, G_MAXINT));
+
+  ret = gst_pad_try_set_caps (videofilter->srcpad, peercaps);
+
+  gst_caps_unref(peercaps);
+
+  if(ret==GST_PAD_LINK_OK){
+    caps = gst_pad_get_caps (videofilter->srcpad);
+
+    gst_caps_get_int (caps, "width", &videofilter->from_width);
+    gst_caps_get_int (caps, "height", &videofilter->from_height);
+    //gst_videofilter_setup(videofilter);
+  }
+
+  return ret;
+}
+
+static GstPadLinkReturn
+gst_videofilter_sink_link (GstPad *pad, GstCaps *caps)
+{
+  GstVideofilter *videofilter;
+  GstPadLinkReturn ret;
+  GstCaps *peercaps;
+
+  GST_DEBUG("gst_videofilter_sink_link");
+  videofilter = GST_VIDEOFILTER (gst_pad_get_parent (pad));
+
+  if (!GST_CAPS_IS_FIXED (caps)) {
+    return GST_PAD_LINK_DELAYED;
+  }
+
+  videofilter->format = gst_videofilter_find_format_by_caps (videofilter,caps);
+  g_print("sink_link: %s\n",gst_caps_to_string(caps));
+  g_return_val_if_fail(videofilter->format, GST_PAD_LINK_REFUSED);
+
+  gst_caps_get_int (caps, "width", &videofilter->from_width);
+  gst_caps_get_int (caps, "height", &videofilter->from_height);
+
+  gst_videofilter_setup(videofilter);
+
+  peercaps = gst_caps_copy(caps);
+
+  gst_caps_set(peercaps, "width", GST_PROPS_INT (videofilter->to_width));
+  gst_caps_set(peercaps, "height", GST_PROPS_INT (videofilter->to_height));
+
+  ret = gst_pad_try_set_caps (videofilter->srcpad, peercaps);
+
+  gst_caps_unref(peercaps);
+
+  if(ret==GST_PAD_LINK_OK || ret==GST_PAD_LINK_DONE){
+    caps = gst_pad_get_caps (videofilter->srcpad);
+
+    //gst_caps_get_int (caps, "width", &videofilter->to_width);
+    //gst_caps_get_int (caps, "height", &videofilter->to_height);
+    //gst_videofilter_setup(videofilter);
+  }
+
+  g_print("returning %d\n",ret);
+
+  return ret;
+}
+
+static void
+gst_videofilter_init (GstVideofilter *videofilter)
+{
+  GST_DEBUG("gst_videofilter_init");
+
+}
+
+void
+gst_videofilter_postinit (GstVideofilter *videofilter)
+{
+  /* sinkpad and srcpad should be inited by subclass */
+
+  /* FIXME */
+  //videofilter->sinkpad = NULL;
+  gst_element_add_pad(GST_ELEMENT(videofilter),videofilter->sinkpad);
+  gst_pad_set_chain_function(videofilter->sinkpad,gst_videofilter_chain);
+  gst_pad_set_link_function(videofilter->sinkpad,gst_videofilter_sink_link);
+  gst_pad_set_getcaps_function(videofilter->sinkpad,gst_videofilter_sink_getcaps);
+
+  /* FIXME */
+  //videofilter->srcpad = NULL;
+  gst_element_add_pad(GST_ELEMENT(videofilter),videofilter->srcpad);
+  gst_pad_set_link_function(videofilter->srcpad,gst_videofilter_src_link);
+  //gst_pad_set_getcaps_function(videofilter->srcpad,gst_videofilter_getcaps);
+
+  videofilter->inited = FALSE;
+}
+
+
+static void
+gst_videofilter_chain (GstPad *pad, GstBuffer *buf)
+{
+  GstVideofilter *videofilter;
+  guchar *data;
+  gulong size;
+  GstBuffer *outbuf;
+
+  GST_DEBUG ("gst_videofilter_chain");
+
+  g_return_if_fail (pad != NULL);
+  g_return_if_fail (GST_IS_PAD (pad));
+  g_return_if_fail (buf != NULL);
+
+  videofilter = GST_VIDEOFILTER (gst_pad_get_parent (pad));
+  //g_return_if_fail (videofilter->inited);
+
+  data = GST_BUFFER_DATA(buf);
+  size = GST_BUFFER_SIZE(buf);
+
+  if(videofilter->passthru){
+    gst_pad_push(videofilter->srcpad, buf);
+    return;
+  }
+
+  GST_DEBUG ("gst_videofilter_chain: got buffer of %ld bytes in '%s'",size,
+		              GST_OBJECT_NAME (videofilter));
+ 
+  GST_DEBUG("size=%ld from=%dx%d to=%dx%d fromsize=%ld (should be %d) tosize=%d",
+	size,
+	videofilter->from_width, videofilter->from_height,
+	videofilter->to_width, videofilter->to_height,
+  	size, videofilter->from_buf_size,
+  	videofilter->to_buf_size);
+
+  g_return_if_fail (size == videofilter->from_buf_size);
+
+  outbuf = gst_buffer_new();
+  /* FIXME: handle bufferpools */
+  GST_BUFFER_SIZE(outbuf) = videofilter->to_buf_size;
+  GST_BUFFER_DATA(outbuf) = g_malloc (videofilter->to_buf_size);
+  GST_BUFFER_TIMESTAMP(outbuf) = GST_BUFFER_TIMESTAMP(buf);
+
+  g_return_if_fail(videofilter->format);
+  GST_DEBUG ("format %s",videofilter->format->fourcc);
+
+  videofilter->in_buf = buf;
+  videofilter->out_buf = outbuf;
+
+  videofilter->format->filter_func(videofilter, GST_BUFFER_DATA(outbuf), data);
+
+  GST_DEBUG ("gst_videofilter_chain: pushing buffer of %d bytes in '%s'",GST_BUFFER_SIZE(outbuf),
+	              GST_OBJECT_NAME (videofilter));
+
+  gst_pad_push(videofilter->srcpad, outbuf);
+
+  gst_buffer_unref(buf);
+}
+
+static void
+gst_videofilter_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
+{
+  GstVideofilter *src;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail(GST_IS_VIDEOFILTER(object));
+  src = GST_VIDEOFILTER(object);
+
+  GST_DEBUG("gst_videofilter_set_property");
+  switch (prop_id) {
+    default:
+      break;
+  }
+}
+
+static void
+gst_videofilter_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
+{
+  GstVideofilter *src;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail(GST_IS_VIDEOFILTER(object));
+  src = GST_VIDEOFILTER(object);
+
+  switch (prop_id) {
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+int gst_videofilter_get_input_width(GstVideofilter *videofilter)
+{
+  g_return_val_if_fail(GST_IS_VIDEOFILTER(videofilter),0);
+
+  return videofilter->from_width;
+}
+
+int gst_videofilter_get_input_height(GstVideofilter *videofilter)
+{
+  g_return_val_if_fail(GST_IS_VIDEOFILTER(videofilter),0);
+
+  return videofilter->from_height;
+}
+
+void gst_videofilter_set_output_size(GstVideofilter *videofilter,
+    int width, int height)
+{
+  int ret;
+  GstCaps *srccaps;
+
+  g_return_if_fail(GST_IS_VIDEOFILTER(videofilter));
+
+  videofilter->to_width = width;
+  videofilter->to_height = height;
+
+  videofilter->to_buf_size = (videofilter->to_width * videofilter->to_height
+      * videofilter->format->depth)/8;
+
+  srccaps = gst_caps_copy(gst_pad_get_caps(videofilter->srcpad));
+
+  gst_caps_set(srccaps, "width", GST_PROPS_INT (videofilter->to_width));
+  gst_caps_set(srccaps, "height", GST_PROPS_INT (videofilter->to_height));
+
+  ret = gst_pad_try_set_caps (videofilter->srcpad, srccaps);
+
+  g_print("try_set_caps() returned %d\n", ret);
+
+}
+
+static void gst_videofilter_setup(GstVideofilter *videofilter)
+{
+  GstVideofilterClass *klass;
+
+  klass = GST_VIDEOFILTER_CLASS(G_OBJECT_GET_CLASS(videofilter));
+
+  if(klass->setup){
+    klass->setup(videofilter);
+  }
+
+  if(videofilter->to_width == 0){
+    videofilter->to_width = videofilter->from_width;
+  }
+  if(videofilter->to_height == 0){
+    videofilter->to_height = videofilter->from_height;
+  }
+
+  g_return_if_fail(videofilter->format != NULL);
+  g_return_if_fail(videofilter->from_width > 0);
+  g_return_if_fail(videofilter->from_height > 0);
+  g_return_if_fail(videofilter->to_width > 0);
+  g_return_if_fail(videofilter->to_height > 0);
+
+  videofilter->from_buf_size = (videofilter->from_width * videofilter->from_height *
+      videofilter->format->depth) / 8;
+  videofilter->to_buf_size = (videofilter->to_width * videofilter->to_height *
+      videofilter->format->depth) / 8;
+
+  videofilter->inited = TRUE;
+}
+
+GstVideofilterFormat *gst_videofilter_find_format_by_caps(GstVideofilter *videofilter,
+    GstCaps *caps)
+{
+  int i;
+  GstCaps *c;
+  GstVideofilterClass *klass;
+  GstVideofilterFormat *format;
+
+  klass = GST_VIDEOFILTER_CLASS(G_OBJECT_GET_CLASS(videofilter));
+
+  g_return_val_if_fail(caps != NULL, NULL);
+
+  for(i=0;i<klass->formats->len;i++){
+    format = g_ptr_array_index(klass->formats,i);
+    c = gst_videofilter_format_get_caps(format);
+
+    if(c){
+      if(gst_caps_is_always_compatible(caps, c)){
+	gst_caps_unref(c);
+	return format;
+      }
+    }
+    gst_caps_unref(c);
+  }
+
+  return NULL;
+}
+
+void gst_videofilter_class_add_format(GstVideofilterClass *videofilterclass,
+    GstVideofilterFormat *format)
+{
+  g_ptr_array_add(videofilterclass->formats, format);
+}
+
+static gboolean
+plugin_init (GModule *module, GstPlugin *plugin)
+{
+#if 0
+  GstElementFactory *factory;
+
+  /* create an elementfactory for the videofilter element */
+  factory = gst_element_factory_new("videofilter",GST_TYPE_VIDEOFILTER,
+                                   &videofilter_details);
+  g_return_val_if_fail(factory != NULL, FALSE);
+
+  /* FIXME: we need to init the class before we can call the
+   * pad template factories */
+  gst_element_factory_add_pad_template (factory,
+      GST_PAD_TEMPLATE_GET (gst_videofilter_sink_template_factory));
+  gst_element_factory_add_pad_template (factory,
+      GST_PAD_TEMPLATE_GET (gst_videofilter_src_template_factory));
+
+  gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
+#endif
+
+  return TRUE;
+}
+
+GstPluginDesc plugin_desc = {
+  GST_VERSION_MAJOR,
+  GST_VERSION_MINOR,
+  "gstvideofilter",
+  plugin_init
+};
--- a/gst-libs/gst/video/gstvideofilter.h
+++ b/gst-libs/gst/video/gstvideofilter.h
@ -0,0 +1,109 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * 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_VIDEOFILTER_H__
+#define __GST_VIDEOFILTER_H__
+
+
+#include <config.h>
+#include <gst/gst.h>
+
+
+G_BEGIN_DECLS
+
+typedef struct _GstVideofilter GstVideofilter;
+typedef struct _GstVideofilterClass GstVideofilterClass;
+
+typedef void (*GstVideofilterFilterFunc)(GstVideofilter *filter,
+    void *out_data, void *in_data);
+
+typedef void (*GstVideofilterSetupFunc)(GstVideofilter *filter);
+
+typedef struct _GstVideofilterFormat GstVideofilterFormat;
+struct _GstVideofilterFormat {
+  char *fourcc;
+  int depth;
+  GstVideofilterFilterFunc filter_func;
+  int bpp;
+  unsigned int endianness;
+  unsigned int red_mask;
+  unsigned int green_mask;
+  unsigned int blue_mask;
+};
+
+#define GST_TYPE_VIDEOFILTER \
+  (gst_videofilter_get_type())
+#define GST_VIDEOFILTER(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_VIDEOFILTER,GstVideofilter))
+#define GST_VIDEOFILTER_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_VIDEOFILTER,GstVideofilterClass))
+#define GST_IS_VIDEOFILTER(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_VIDEOFILTER))
+#define GST_IS_VIDEOFILTER_CLASS(obj) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_VIDEOFILTER))
+
+struct _GstVideofilter {
+  GstElement element;
+
+  GstPad *sinkpad,*srcpad;
+
+  /* video state */
+  gboolean inited;
+  GstVideofilterFormat *format;
+  gint to_width;
+  gint to_height;
+  gint from_width;
+  gint from_height;
+  gboolean passthru;
+
+  /* private */
+  gint from_buf_size;
+  gint to_buf_size;
+
+  GstBuffer *in_buf;
+  GstBuffer *out_buf;
+};
+
+struct _GstVideofilterClass {
+  GstElementClass parent_class;
+
+  GPtrArray *formats;
+  GstVideofilterSetupFunc setup;
+};
+
+GType gst_videofilter_get_type(void);
+
+int gst_videofilter_get_input_width(GstVideofilter *videofilter);
+int gst_videofilter_get_input_height(GstVideofilter *videofilter);
+void gst_videofilter_set_output_size(GstVideofilter *videofilter,
+    int width, int height);
+GstVideofilterFormat *gst_videofilter_find_format_by_caps(GstVideofilter *filter,
+    GstCaps *caps);
+GstCaps *gst_videofilter_class_get_capslist(GstVideofilterClass *videofilterclass);
+
+void gst_videofilter_postinit(GstVideofilter *videofilter);
+
+void gst_videofilter_class_add_format(GstVideofilterClass *videofilterclass,
+    GstVideofilterFormat *format);
+
+G_END_DECLS
+
+#endif /* __GST_VIDEOFILTER_H__ */
+