Element that decodes images using gdk_pixbuf

Original commit message from CVS:
Element that decodes images using gdk_pixbuf

ext/gdk_pixbuf/Makefile.am

@@ -0,0 +1,11 @@
+plugindir = $(libdir)/gstreamer-@GST_MAJORMINOR@
+
+plugin_LTLIBRARIES = libgstgdkpixbuf.la
+
+libgstgdkpixbuf_la_SOURCES = gstgdkpixbuf.c
+libgstgdkpixbuf_la_CFLAGS = $(GST_CFLAGS) $(GTK_CFLAGS)
+libgstgdkpixbuf_la_LIBADD = $(GTK_LIBS)
+libgstgdkpixbuf_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
+
+noinst_HEADERS = gstgdkpixbuf.h
+

ext/gdk_pixbuf/gstgdkpixbuf.c

@@ -0,0 +1,358 @@
+/*
+ * gstgdkpixbuf.c
+ * GStreamer
+ * Copyright (C) 1999-2001 Erik Walthinsen <omega@cse.ogi.edu>
+ * Copyright (C) 2003 David A. 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.
+ */
+
+#include <gst/gst.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <string.h>
+
+#include "gstgdkpixbuf.h"
+
+static GstElementDetails plugin_details = {
+  "GdkPixbuf image decoder",
+  "Codecs/GdkPixbuf",
+  "LGPL",
+  "Decodes images in a video stream using GdkPixbuf",
+  VERSION,
+  "David A. Schleef <ds@schleef.org>",
+  "(C) 2002, 2003"
+};
+
+/* Filter signals and args */
+enum {
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum {
+  ARG_0,
+  ARG_SILENT
+};
+
+GST_PAD_TEMPLATE_FACTORY (gst_gdk_pixbuf_sink_factory,
+  "sink",
+  GST_PAD_SINK,
+  GST_PAD_ALWAYS,
+  GST_CAPS_NEW("gdk_pixbuf_sink", "image/png", NULL),
+  GST_CAPS_NEW("gdk_pixbuf_sink", "image/jpeg", NULL),
+  GST_CAPS_NEW("gdk_pixbuf_sink", "image/gif", NULL),
+  GST_CAPS_NEW("gdk_pixbuf_sink", "image/x-icon", NULL),
+  GST_CAPS_NEW("gdk_pixbuf_sink", "application/x-navi-animation", NULL),
+  GST_CAPS_NEW("gdk_pixbuf_sink", "image/x-cmu-raster", NULL),
+  GST_CAPS_NEW("gdk_pixbuf_sink", "image/x-sun-raster", NULL),
+  GST_CAPS_NEW("gdk_pixbuf_sink", "image/x-pixmap", NULL),
+  GST_CAPS_NEW("gdk_pixbuf_sink", "image/tiff", NULL),
+  GST_CAPS_NEW("gdk_pixbuf_sink", "image/x-portable-anymap", NULL),
+  GST_CAPS_NEW("gdk_pixbuf_sink", "image/x-portable-bitmap", NULL),
+  GST_CAPS_NEW("gdk_pixbuf_sink", "image/x-portable-graymap", NULL),
+  GST_CAPS_NEW("gdk_pixbuf_sink", "image/x-portable-pixmap", NULL),
+  GST_CAPS_NEW("gdk_pixbuf_sink", "image/bmp", NULL),
+  GST_CAPS_NEW("gdk_pixbuf_sink", "image/x-bmp", NULL),
+  GST_CAPS_NEW("gdk_pixbuf_sink", "image/x-MS-bmp", NULL),
+  GST_CAPS_NEW("gdk_pixbuf_sink", "image/vnd.wap.wbmp", NULL),
+  GST_CAPS_NEW("gdk_pixbuf_sink", "image/x-bitmap", NULL),
+  GST_CAPS_NEW("gdk_pixbuf_sink", "image/x-tga", NULL)
+);
+
+GST_PAD_TEMPLATE_FACTORY (gst_gdk_pixbuf_src_factory,
+  "src",
+  GST_PAD_SRC,
+  GST_PAD_ALWAYS,
+  GST_CAPS_NEW(
+    "gdk_pixbuf_src",
+    "video/raw",
+      "format", GST_PROPS_FOURCC(GST_MAKE_FOURCC('R','G','B',' ')),
+      "width", GST_PROPS_INT_RANGE(1,INT_MAX),
+      "height", GST_PROPS_INT_RANGE(1,INT_MAX),
+      "bpp", GST_PROPS_INT(32),
+      "depth", GST_PROPS_INT(24),
+      "endianness", GST_PROPS_INT(G_BIG_ENDIAN),
+      "red_mask", GST_PROPS_INT(0x00ff0000),
+      "green_mask", GST_PROPS_INT(0x0000ff00),
+      "blue_mask", GST_PROPS_INT(0x000000ff)
+  )
+);
+
+static void	gst_gdk_pixbuf_class_init	(GstGdkPixbufClass *klass);
+static void	gst_gdk_pixbuf_init	(GstGdkPixbuf *filter);
+
+static void	gst_gdk_pixbuf_set_property(GObject *object, guint prop_id,
+                                                 const GValue *value,
+					         GParamSpec *pspec);
+static void	gst_gdk_pixbuf_get_property(GObject *object, guint prop_id,
+                                                 GValue *value,
+						 GParamSpec *pspec);
+
+static void	gst_gdk_pixbuf_chain	(GstPad *pad, GstBuffer *buf);
+
+static GstElementClass *parent_class = NULL;
+
+static GstPadLinkReturn
+gst_gdk_pixbuf_sink_link (GstPad *pad, GstCaps *caps)
+{
+  GstGdkPixbuf *filter;
+
+  filter = GST_GDK_PIXBUF (gst_pad_get_parent (pad));
+  g_return_val_if_fail (filter != NULL, GST_PAD_LINK_REFUSED);
+  g_return_val_if_fail (GST_IS_GDK_PIXBUF (filter),
+                        GST_PAD_LINK_REFUSED);
+
+  if (GST_CAPS_IS_FIXED (caps))
+  {
+    return GST_PAD_LINK_OK;
+  }
+
+  return GST_PAD_LINK_DELAYED;
+}
+
+static GstCaps *gst_gdk_pixbuf_get_capslist(void)
+{
+  GSList *slist;
+  GSList *slist0;
+  GdkPixbufFormat *pixbuf_format;
+  char **mimetypes;
+  char **mimetype;
+  static GstCaps *capslist = NULL;
+
+  if(capslist==NULL){
+    slist0 = gdk_pixbuf_get_formats();
+
+    for(slist = slist0;slist;slist=g_slist_next(slist)){
+      pixbuf_format = slist->data;
+      mimetypes = gdk_pixbuf_format_get_mime_types(pixbuf_format);
+      for(mimetype = mimetypes; *mimetype; mimetype++){
+        capslist = gst_caps_append(capslist, gst_caps_new("ack",*mimetype,NULL));
+      }
+      g_free(mimetypes);
+    }
+    gst_caps_ref(capslist);
+    gst_caps_sink(capslist);
+    g_slist_free(slist0);
+
+    g_print("%s\n",gst_caps_to_string(capslist));
+  }
+
+  return capslist;
+}
+
+static GstCaps *gst_gdk_pixbuf_sink_getcaps(GstPad *pad, GstCaps *caps)
+{
+  GstGdkPixbuf *filter;
+
+  filter = GST_GDK_PIXBUF (gst_pad_get_parent (pad));
+  g_return_val_if_fail (filter != NULL, NULL);
+  g_return_val_if_fail (GST_IS_GDK_PIXBUF (filter), NULL);
+
+  return gst_gdk_pixbuf_get_capslist();
+}
+
+GType
+gst_gdk_pixbuf_get_type (void)
+{
+  static GType plugin_type = 0;
+
+  if (!plugin_type)
+  {
+    static const GTypeInfo plugin_info =
+    {
+      sizeof (GstGdkPixbufClass),
+      NULL,
+      NULL,
+      (GClassInitFunc) gst_gdk_pixbuf_class_init,
+      NULL,
+      NULL,
+      sizeof (GstGdkPixbuf),
+      0,
+      (GInstanceInitFunc) gst_gdk_pixbuf_init,
+    };
+    plugin_type = g_type_register_static (GST_TYPE_ELEMENT,
+	                                  "GstGdkPixbuf",
+	                                  &plugin_info, 0);
+  }
+  return plugin_type;
+}
+
+/* initialize the plugin's class */
+static void
+gst_gdk_pixbuf_class_init (GstGdkPixbufClass *klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass*) klass;
+  gstelement_class = (GstElementClass*) klass;
+
+  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
+
+  g_object_class_install_property (gobject_class, ARG_SILENT,
+    g_param_spec_boolean ("silent", "Silent", "Produce verbose output ?",
+                          FALSE, G_PARAM_READWRITE));
+
+  gobject_class->set_property = gst_gdk_pixbuf_set_property;
+  gobject_class->get_property = gst_gdk_pixbuf_get_property;
+}
+
+static void
+gst_gdk_pixbuf_init (GstGdkPixbuf *filter)
+{
+  filter->sinkpad = gst_pad_new_from_template (gst_gdk_pixbuf_sink_factory (),
+                                               "sink");
+  gst_pad_set_link_function (filter->sinkpad, gst_gdk_pixbuf_sink_link);
+  gst_pad_set_getcaps_function (filter->sinkpad, gst_gdk_pixbuf_sink_getcaps);
+  filter->srcpad = gst_pad_new_from_template (gst_gdk_pixbuf_src_factory (),
+                                              "src");
+
+  gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
+  gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
+  gst_pad_set_chain_function (filter->sinkpad, gst_gdk_pixbuf_chain);
+
+}
+
+static void
+gst_gdk_pixbuf_chain (GstPad *pad, GstBuffer *buf)
+{
+  GstGdkPixbuf *filter;
+  GdkPixbufLoader *pixbuf_loader;
+  GdkPixbuf *pixbuf;
+  GstBuffer *outbuf;
+  GError *error = NULL;
+
+  g_print("gst_gdk_pixbuf_chain\n");
+
+  g_return_if_fail (GST_IS_PAD (pad));
+  g_return_if_fail (buf != NULL);
+
+  filter = GST_GDK_PIXBUF (GST_OBJECT_PARENT (pad));
+  g_return_if_fail (GST_IS_GDK_PIXBUF (filter));
+
+  pixbuf_loader = gdk_pixbuf_loader_new();
+  //pixbuf_loader = gdk_pixbuf_loader_new_with_type("gif");
+  
+  gdk_pixbuf_loader_write(pixbuf_loader, GST_BUFFER_DATA(buf),
+      GST_BUFFER_SIZE(buf), &error);
+  gdk_pixbuf_loader_close(pixbuf_loader, &error);
+  pixbuf = gdk_pixbuf_loader_get_pixbuf(pixbuf_loader);
+
+  g_print("width=%d height=%d\n", gdk_pixbuf_get_width(pixbuf),
+      gdk_pixbuf_get_height(pixbuf));
+
+  if(filter->image_size == 0){
+    GstCaps *caps;
+
+    filter->width = gdk_pixbuf_get_width(pixbuf);
+    filter->height = gdk_pixbuf_get_height(pixbuf);
+    filter->rowstride = gdk_pixbuf_get_rowstride(pixbuf);
+    filter->image_size = filter->rowstride * filter->height;
+
+    caps = gst_pad_get_caps(filter->srcpad);
+    gst_caps_set(caps, "width", GST_PROPS_INT(filter->width));
+    gst_caps_set(caps, "height", GST_PROPS_INT(filter->height));
+
+    gst_pad_try_set_caps(filter->srcpad, caps);
+  }
+
+  outbuf = gst_buffer_new();
+  GST_BUFFER_TIMESTAMP(outbuf) = GST_BUFFER_TIMESTAMP(buf);
+  GST_BUFFER_DURATION(outbuf) = GST_BUFFER_DURATION(buf);
+  
+  GST_BUFFER_SIZE(outbuf) = filter->image_size;
+  GST_BUFFER_DATA(outbuf) = g_malloc(filter->image_size);
+
+  memcpy(GST_BUFFER_DATA(outbuf), gdk_pixbuf_get_pixels(pixbuf),
+      filter->image_size);
+
+  g_object_unref(G_OBJECT(pixbuf_loader));
+
+  gst_pad_push (filter->srcpad, outbuf);
+}
+
+static void
+gst_gdk_pixbuf_set_property (GObject *object, guint prop_id,
+                                  const GValue *value, GParamSpec *pspec)
+{
+  GstGdkPixbuf *filter;
+
+  g_return_if_fail (GST_IS_GDK_PIXBUF (object));
+  filter = GST_GDK_PIXBUF (object);
+
+  switch (prop_id)
+  {
+  case ARG_SILENT:
+    //filter->silent = g_value_get_boolean (value);
+    break;
+  default:
+    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    break;
+  }
+}
+
+static void
+gst_gdk_pixbuf_get_property (GObject *object, guint prop_id,
+                                  GValue *value, GParamSpec *pspec)
+{
+  GstGdkPixbuf *filter;
+
+  g_return_if_fail (GST_IS_GDK_PIXBUF (object));
+  filter = GST_GDK_PIXBUF (object);
+
+  switch (prop_id) {
+  case ARG_SILENT:
+    //g_value_set_boolean (value, filter->silent);
+    break;
+  default:
+    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    break;
+  }
+}
+
+/* entry point to initialize the plug-in
+ * initialize the plug-in itself
+ * register the element factories and pad templates
+ * register the features
+ */
+static gboolean
+plugin_init (GModule *module, GstPlugin *plugin)
+{
+  GstElementFactory *factory;
+
+  factory = gst_element_factory_new ("gdkpixbufdec", GST_TYPE_GDK_PIXBUF,
+                                     &plugin_details);
+  g_return_val_if_fail (factory != NULL, FALSE);
+
+  gst_element_factory_add_pad_template (factory,
+                                        gst_gdk_pixbuf_src_factory ());
+  gst_element_factory_add_pad_template (factory,
+                                        gst_gdk_pixbuf_sink_factory ());
+
+  gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
+
+  /* plugin initialisation succeeded */
+  return TRUE;
+}
+
+/* this is the structure that gst-register looks for
+ * so keep the name plugin_desc, or you cannot get your plug-in registered */
+GstPluginDesc plugin_desc = {
+  GST_VERSION_MAJOR,
+  GST_VERSION_MINOR,
+  "gdkpixbuf",
+  plugin_init
+};

ext/gdk_pixbuf/gstgdkpixbuf.h

@@ -0,0 +1,48 @@
+/* 
+ * gstplugin.h: sample header file for plug-in
+ */
+
+#ifndef __GST_GDK_PIXBUF_H__
+#define __GST_GDK_PIXBUF_H__
+
+#include <gst/gst.h>
+
+G_BEGIN_DECLS
+
+/* #define's don't like whitespacey bits */
+#define GST_TYPE_GDK_PIXBUF \
+  (gst_gdk_pixbuf_get_type())
+#define GST_GDK_PIXBUF(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GDK_PIXBUF,GstGdkPixbuf))
+#define GST_GDK_PIXBUF_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_GDK_PIXBUF,GstGdkPixbuf))
+#define GST_IS_GDK_PIXBUF(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GDK_PIXBUF))
+#define GST_IS_GDK_PIXBUF_CLASS(obj) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_GDK_PIXBUF))
+
+typedef struct _GstGdkPixbuf      GstGdkPixbuf;
+typedef struct _GstGdkPixbufClass GstGdkPixbufClass;
+
+struct _GstGdkPixbuf
+{
+  GstElement element;
+
+  GstPad *sinkpad, *srcpad;
+
+  int width;
+  int height;
+  int rowstride;
+  unsigned int image_size;
+};
+
+struct _GstGdkPixbufClass 
+{
+  GstElementClass parent_class;
+};
+
+GType gst_gdk_pixbuf_get_type (void);
+
+G_END_DECLS
+
+#endif /* __GST_GDK_PIXBUF_H__ */