--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gstreamer_core/libs/gst/base/gstpushsrc.c	Thu Dec 17 08:53:32 2009 +0200
@@ -0,0 +1,124 @@
+/* GStreamer
+ * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
+ *               2000,2005 Wim Taymans <wim@fluendo.com>
+ *
+ * gstpushsrc.c:
+ *
+ * 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:gstpushsrc
+ * @short_description: Base class for push based source elements
+ * @see_also: #GstBaseSrc
+ *
+ * This class is mostly useful for elements that cannot do
+ * random access, or at least very slowly. The source usually
+ * prefers to push out a fixed size buffer.
+ *
+ * Subclasses usually operate in a format that is different from the
+ * default GST_FORMAT_BYTES format of #GstBaseSrc.
+ *
+ * Classes extending this base class will usually be scheduled
+ * in a push based mode. If the peer accepts to operate without
+ * offsets and within the limits of the allowed block size, this
+ * class can operate in getrange based mode automatically. To make
+ * this possible, the subclass should override the ::check_get_range
+ * method.
+ *
+ * The subclass should extend the methods from the baseclass in
+ * addition to the ::create method.
+ *
+ * Seeking, flushing, scheduling and sync is all handled by this
+ * base class.
+ *
+ * Last reviewed on 2006-07-04 (0.10.9)
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "gstpushsrc.h"
+#include "gsttypefindhelper.h"
+#include <gst/gstmarshal.h>
+
+GST_DEBUG_CATEGORY_STATIC (gst_push_src_debug);
+#ifndef __SYMBIAN32__
+#define GST_CAT_DEFAULT gst_push_src_debug
+#endif
+
+#define _do_init(type) \
+    GST_DEBUG_CATEGORY_INIT (gst_push_src_debug, "pushsrc", 0, \
+        "pushsrc element");
+
+GST_BOILERPLATE_FULL (GstPushSrc, gst_push_src, GstBaseSrc, GST_TYPE_BASE_SRC,
+    _do_init);
+
+static gboolean gst_push_src_check_get_range (GstBaseSrc * src);
+static GstFlowReturn gst_push_src_create (GstBaseSrc * bsrc, guint64 offset,
+    guint length, GstBuffer ** ret);
+
+static void
+gst_push_src_base_init (gpointer g_class)
+{
+  /* nop */
+}
+
+static void
+gst_push_src_class_init (GstPushSrcClass * klass)
+{
+  GstBaseSrcClass *gstbasesrc_class = (GstBaseSrcClass *) klass;
+
+  gstbasesrc_class->create = GST_DEBUG_FUNCPTR (gst_push_src_create);
+  gstbasesrc_class->check_get_range =
+      GST_DEBUG_FUNCPTR (gst_push_src_check_get_range);
+}
+
+static void
+gst_push_src_init (GstPushSrc * pushsrc, GstPushSrcClass * klass)
+{
+  /* nop */
+}
+
+static gboolean
+gst_push_src_check_get_range (GstBaseSrc * src)
+{
+  /* a pushsrc can by default never operate in pull mode override
+   * if you want something different. */
+  return FALSE;
+}
+
+static GstFlowReturn
+gst_push_src_create (GstBaseSrc * bsrc, guint64 offset, guint length,
+    GstBuffer ** ret)
+{
+  GstFlowReturn fret;
+  GstPushSrc *src;
+  GstPushSrcClass *pclass;
+
+  src = GST_PUSH_SRC (bsrc);
+  pclass = GST_PUSH_SRC_GET_CLASS (src);
+  if (pclass->create)
+    fret = pclass->create (src, ret);
+  else
+    fret = GST_FLOW_ERROR;
+
+  return fret;
+}