rsvg: Add RSVG SVG decoder plugin

This supports
  - decoding single SVG images and a stream of SVG images with a given framerate
  - lossless scaling of SVG images
  - ARGB output

configure.ac

@@ -1303,6 +1303,17 @@ AG_GST_CHECK_FEATURE(OFA, [ofa plugins], ofa, [
   AC_SUBST(OFA_LIBS)
 ])
 
+dnl *** rsvg ***
+translit(dnm, m, l) AM_CONDITIONAL(USE_RSVG, true)
+AG_GST_CHECK_FEATURE(RSVG, [rsvg decoder], rsvg, [
+  PKG_CHECK_MODULES(RSVG, librsvg-2.0 >= 2.14 cairo, HAVE_RSVG="yes", [
+    HAVE_RSVG="no"
+    AC_MSG_RESULT(no)
+  ])
+  AC_SUBST(RSVG_CFLAGS)
+  AC_SUBST(RSVG_LIBS)
+])
+
 dnl *** timidity ***
 translit(dnm, m, l) AM_CONDITIONAL(USE_TIMIDITY, true)
 AG_GST_CHECK_FEATURE(TIMIDITY, [timidity midi soft synth plugin], timidity, [
@@ -1805,6 +1816,7 @@ ext/mythtv/Makefile
 ext/nas/Makefile
 ext/neon/Makefile
 ext/ofa/Makefile
+ext/rsvg/Makefile
 ext/resindvd/Makefile
 ext/schroedinger/Makefile
 ext/sdl/Makefile

ext/Makefile.am

@@ -250,6 +250,12 @@ else
 OFA_DIR=
 endif
 
+if USE_RSVG
+RSVG_DIR=rsvg
+else
+RSVG_DIR=
+endif
+
 if USE_TIMIDITY
 TIMIDITY_DIR=timidity
 endif
@@ -391,6 +397,7 @@ SUBDIRS=\
 	$(NAS_DIR) \
 	$(NEON_DIR) \
 	$(OFA_DIR) \
+	$(RSVG_DIR) \
 	$(POLYP_DIR) \
 	$(SCHRO_DIR) \
 	$(SDL_DIR) \
@@ -441,6 +448,7 @@ DIST_SUBDIRS = \
 	nas \
 	neon \
 	ofa \
+	rsvg \
 	resindvd \
 	schroedinger \
 	sdl \

ext/rsvg/Makefile.am

@@ -0,0 +1,16 @@
+plugin_LTLIBRARIES = libgstrsvg.la
+
+libgstrsvg_la_SOURCES = gstrsvg.c gstrsvgdec.c
+libgstrsvg_la_CFLAGS = \
+	$(GST_PLUGINS_BASE_CFLAGS) \
+	$(GST_CFLAGS) \
+	$(RSVG_CFLAGS)
+libgstrsvg_la_LIBADD = \
+	$(GST_PLUGINS_BASE_LIBS) -lgstvideo-$(GST_MAJORMINOR) \
+	$(GST_BASE_LIBS) \
+	$(GST_LIBS) \
+	$(RSVG_LIBS)
+libgstrsvg_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS) $(LIBM)
+libgstrsvg_la_LIBTOOLFLAGS = --tag=disable-static
+
+noinst_HEADERS = gstrsvgdec.h 

ext/rsvg/gstrsvg.c

@@ -0,0 +1,43 @@
+/* GStreamer
+ * Copyright (C) <2009> Sebastian Dröge <sebastian.droege@collabora.co.uk>
+ *
+ * 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.
+ */
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <gst/gst.h>
+
+#include "gstrsvgdec.h"
+
+static gboolean
+plugin_init (GstPlugin * plugin)
+{
+  rsvg_init ();
+
+  if (!gst_element_register (plugin, "rsvgdec", GST_RANK_PRIMARY,
+          GST_TYPE_RSVG_DEC))
+    return FALSE;
+
+  return TRUE;
+}
+
+GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
+    GST_VERSION_MINOR,
+    "rsvg",
+    "RSVG plugin library",
+    plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)

ext/rsvg/gstrsvgdec.c

@@ -0,0 +1,521 @@
+/* GStreamer
+ * Copyright (C) <2009> Sebastian Dröge <sebastian.droege@collabora.co.uk>
+ *
+ * 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "gstrsvgdec.h"
+
+#include <string.h>
+
+GST_DEBUG_CATEGORY_STATIC (rsvgdec_debug);
+#define GST_CAT_DEFAULT rsvgdec_debug
+
+static GstStaticPadTemplate sink_factory =
+    GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("image/svg+xml; image/svg"));
+
+static GstStaticPadTemplate src_factory =
+GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
+#if G_BYTE_ORDER == G_LITTLE_ENDIAN
+    GST_STATIC_CAPS (GST_VIDEO_CAPS_BGRA)
+#else
+    GST_STATIC_CAPS (GST_VIDEO_CAPS_ARGB)
+#endif
+    );
+
+GST_BOILERPLATE (GstRsvgDec, gst_rsvg_dec, GstElement, GST_TYPE_ELEMENT);
+
+static void gst_rsvg_dec_reset (GstRsvgDec * rsvg);
+
+static GstFlowReturn gst_rsvg_dec_chain (GstPad * pad, GstBuffer * buffer);
+static gboolean gst_rsvg_dec_sink_set_caps (GstPad * pad, GstCaps * caps);
+static gboolean gst_rsvg_dec_sink_event (GstPad * pad, GstEvent * event);
+
+static gboolean gst_rsvg_dec_src_event (GstPad * pad, GstEvent * event);
+static gboolean gst_rsvg_dec_src_query (GstPad * pad, GstQuery * query);
+static const GstQueryType *gst_rsvg_dec_src_query_type (GstPad * pad);
+static gboolean gst_rsvg_dec_src_set_caps (GstPad * pad, GstCaps * caps);
+
+static GstStateChangeReturn gst_rsvg_dec_change_state (GstElement * element,
+    GstStateChange transition);
+
+static void gst_rsvg_dec_finalize (GObject * object);
+
+static void
+gst_rsvg_dec_base_init (gpointer g_class)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
+
+  gst_element_class_set_details_simple (element_class,
+      "SVG image decoder", "Codec/Decoder/Image",
+      "Uses librsvg to decode SVG images",
+      "Sebastian Dröge <sebastian.droege@collabora.co.uk>");
+
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&sink_factory));
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&src_factory));
+}
+
+static void
+gst_rsvg_dec_class_init (GstRsvgDecClass * klass)
+{
+  GstElementClass *element_class = (GstElementClass *) klass;
+  GObjectClass *gobject_class = (GObjectClass *) klass;
+
+  GST_DEBUG_CATEGORY_INIT (rsvgdec_debug, "rsvgdec", 0, "RSVG decoder");
+
+  gobject_class->finalize = gst_rsvg_dec_finalize;
+  element_class->change_state = GST_DEBUG_FUNCPTR (gst_rsvg_dec_change_state);
+}
+
+static void
+gst_rsvg_dec_init (GstRsvgDec * rsvg, GstRsvgDecClass * klass)
+{
+  rsvg->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");
+  gst_pad_set_setcaps_function (rsvg->sinkpad, gst_rsvg_dec_sink_set_caps);
+  gst_pad_set_event_function (rsvg->sinkpad, gst_rsvg_dec_sink_event);
+  gst_pad_set_chain_function (rsvg->sinkpad, gst_rsvg_dec_chain);
+  gst_element_add_pad (GST_ELEMENT (rsvg), rsvg->sinkpad);
+
+  rsvg->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
+  gst_pad_set_event_function (rsvg->srcpad, gst_rsvg_dec_src_event);
+  gst_pad_set_query_function (rsvg->srcpad, gst_rsvg_dec_src_query);
+  gst_pad_set_query_type_function (rsvg->srcpad, gst_rsvg_dec_src_query_type);
+  gst_pad_set_setcaps_function (rsvg->srcpad, gst_rsvg_dec_src_set_caps);
+  gst_element_add_pad (GST_ELEMENT (rsvg), rsvg->srcpad);
+
+  rsvg->adapter = gst_adapter_new ();
+
+  gst_rsvg_dec_reset (rsvg);
+}
+
+static void
+gst_rsvg_dec_finalize (GObject * object)
+{
+  GstRsvgDec *rsvg = GST_RSVG_DEC (object);
+
+  if (rsvg->adapter) {
+    gst_object_unref (rsvg->adapter);
+    rsvg->adapter = NULL;
+  }
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gst_rsvg_dec_reset (GstRsvgDec * dec)
+{
+  gst_adapter_clear (dec->adapter);
+  dec->width = dec->height = 0;
+  dec->fps_n = 0;
+  dec->fps_d = 1;
+  dec->timestamp_offset = GST_CLOCK_TIME_NONE;
+  dec->frame_count = 0;
+
+  gst_segment_init (&dec->segment, GST_FORMAT_UNDEFINED);
+  dec->need_newsegment = TRUE;
+
+  g_list_foreach (dec->pending_events, (GFunc) gst_mini_object_unref, NULL);
+  g_list_free (dec->pending_events);
+  dec->pending_events = NULL;
+
+  if (dec->pending_tags) {
+    gst_tag_list_free (dec->pending_tags);
+    dec->pending_tags = NULL;
+  }
+}
+
+static GstFlowReturn
+gst_rsvg_decode_image (GstRsvgDec * rsvg, const guint8 * data, guint size,
+    GstBuffer ** buffer)
+{
+  GstFlowReturn ret = GST_FLOW_OK;
+  cairo_t *cr;
+  cairo_surface_t *surface;
+  RsvgHandle *handle;
+  GError *error = NULL;
+  RsvgDimensionData dimension;
+  gdouble scalex, scaley;
+  const gchar *title = NULL, *comment = NULL;
+
+  handle = rsvg_handle_new_from_data (data, size, &error);
+  if (!handle) {
+    GST_ERROR_OBJECT (rsvg, "Failed to parse SVG image: %s", error->message);
+    g_error_free (error);
+    return GST_FLOW_ERROR;
+  }
+
+  title = rsvg_handle_get_title (handle);
+  comment = rsvg_handle_get_desc (handle);
+
+  if (title || comment) {
+    if (!rsvg->pending_tags)
+      rsvg->pending_tags = gst_tag_list_new ();
+
+    if (title && *title)
+      gst_tag_list_add (rsvg->pending_tags, GST_TAG_MERGE_REPLACE_ALL,
+          GST_TAG_TITLE, title, NULL);
+    if (comment && *comment)
+      gst_tag_list_add (rsvg->pending_tags, GST_TAG_MERGE_REPLACE_ALL,
+          GST_TAG_COMMENT, comment, NULL);
+  }
+
+  rsvg_handle_get_dimensions (handle, &dimension);
+  if (rsvg->width != dimension.width || rsvg->height != dimension.height) {
+    GstCaps *caps1, *caps2, *caps3;
+    GstStructure *s;
+
+    caps1 = gst_caps_copy (gst_pad_get_pad_template_caps (rsvg->srcpad));
+    caps2 = gst_pad_peer_get_caps (rsvg->srcpad);
+    if (caps2) {
+      caps3 = gst_caps_intersect (caps1, caps2);
+      gst_caps_unref (caps1);
+      gst_caps_unref (caps2);
+      caps1 = caps3;
+      caps3 = NULL;
+    }
+
+    if (gst_caps_is_empty (caps1)) {
+      GST_ERROR_OBJECT (rsvg, "Unable to negotiate a format");
+      gst_caps_unref (caps1);
+      g_object_unref (handle);
+      return GST_FLOW_NOT_NEGOTIATED;
+    }
+
+    caps2 = gst_caps_copy (gst_pad_get_pad_template_caps (rsvg->srcpad));
+    s = gst_caps_get_structure (caps2, 0);
+    gst_structure_set (s, "width", G_TYPE_INT, dimension.width, "height",
+        G_TYPE_INT, dimension.height, "framerate", GST_TYPE_FRACTION, 0, 1,
+        NULL);
+    caps3 = gst_caps_intersect (caps1, caps2);
+    if (!gst_caps_is_empty (caps3)) {
+      gst_caps_truncate (caps3);
+      gst_pad_set_caps (rsvg->srcpad, caps3);
+      gst_caps_unref (caps1);
+      gst_caps_unref (caps2);
+      gst_caps_unref (caps3);
+      rsvg->width = dimension.width;
+      rsvg->height = dimension.height;
+    } else {
+      gst_caps_unref (caps2);
+      gst_caps_unref (caps3);
+      gst_caps_truncate (caps1);
+
+      s = gst_caps_get_structure (caps1, 0);
+      gst_structure_set (s, "framerate", GST_TYPE_FRACTION, 0, 1, NULL);
+
+      if (!gst_caps_is_fixed (caps1)
+          && (!gst_structure_fixate_field_nearest_int (s, "width",
+                  dimension.width)
+              || !gst_structure_fixate_field_nearest_int (s, "height",
+                  dimension.height))) {
+        g_object_unref (handle);
+        GST_ERROR_OBJECT (rsvg, "Failed to fixate caps");
+        return GST_FLOW_NOT_NEGOTIATED;
+      }
+      gst_pad_set_caps (rsvg->srcpad, caps1);
+      gst_structure_get_int (s, "width", &rsvg->width);
+      gst_structure_get_int (s, "height", &rsvg->height);
+      gst_caps_unref (caps1);
+    }
+  }
+
+  if ((ret = gst_pad_alloc_buffer_and_set_caps (rsvg->srcpad,
+              GST_BUFFER_OFFSET_NONE,
+              rsvg->width * rsvg->height * 4,
+              GST_PAD_CAPS (rsvg->srcpad), buffer)) != GST_FLOW_OK) {
+    g_object_unref (handle);
+    GST_ERROR_OBJECT (rsvg, "Buffer allocation failed %s",
+        gst_flow_get_name (ret));
+    return ret;
+  }
+
+  surface =
+      cairo_image_surface_create_for_data (GST_BUFFER_DATA (*buffer),
+      CAIRO_FORMAT_ARGB32, rsvg->width, rsvg->height, rsvg->width * 4);
+
+  cr = cairo_create (surface);
+  cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
+  cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.0);
+  cairo_paint (cr);
+  cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
+  cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 1.0);
+
+  scalex = scaley = 1.0;
+  if (rsvg->width != dimension.width) {
+    scalex = ((gdouble) rsvg->width) / ((gdouble) dimension.width);
+  }
+  if (rsvg->height != dimension.height) {
+    scaley = ((gdouble) rsvg->height) / ((gdouble) dimension.height);
+  }
+  cairo_scale (cr, scalex, scaley);
+  rsvg_handle_render_cairo (handle, cr);
+
+  g_object_unref (handle);
+  cairo_destroy (cr);
+  cairo_surface_destroy (surface);
+
+  return ret;
+}
+
+static GstFlowReturn
+gst_rsvg_dec_chain (GstPad * pad, GstBuffer * buffer)
+{
+  GstRsvgDec *rsvg = GST_RSVG_DEC (gst_pad_get_parent (pad));
+  gboolean completed = FALSE;
+  const guint8 *data;
+  guint size;
+  gboolean ret = GST_FLOW_OK;
+
+  if (rsvg->timestamp_offset == GST_CLOCK_TIME_NONE) {
+    if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
+      rsvg->timestamp_offset = GST_BUFFER_TIMESTAMP (buffer);
+    else
+      rsvg->timestamp_offset = 0;
+  }
+
+  gst_adapter_push (rsvg->adapter, buffer);
+
+  size = gst_adapter_available (rsvg->adapter);
+
+  /* "<svg></svg>" */
+  while (size >= 5 + 6 && ret == GST_FLOW_OK) {
+    guint i;
+
+    data = gst_adapter_peek (rsvg->adapter, size);
+    for (i = size - 6; i >= 5; i--) {
+      if (memcmp (data + i, "</svg>", 6) == 0) {
+        completed = TRUE;
+        size = i + 6;
+        break;
+      }
+    }
+
+    if (completed) {
+      GstBuffer *outbuf = NULL;
+
+      data = gst_adapter_peek (rsvg->adapter, size);
+
+      ret = gst_rsvg_decode_image (rsvg, data, size, &outbuf);
+      if (ret != GST_FLOW_OK)
+        break;
+
+
+      if (rsvg->fps_n != 0) {
+        GST_BUFFER_TIMESTAMP (outbuf) =
+            rsvg->timestamp_offset + gst_util_uint64_scale (rsvg->frame_count,
+            rsvg->fps_d, rsvg->fps_n * GST_SECOND);
+        GST_BUFFER_DURATION (outbuf) =
+            gst_util_uint64_scale (rsvg->frame_count, rsvg->fps_d,
+            rsvg->fps_n * GST_SECOND);
+      } else {
+        GST_BUFFER_TIMESTAMP (outbuf) = 0;
+      }
+      rsvg->frame_count++;
+
+      if (rsvg->need_newsegment) {
+        gst_pad_push_event (rsvg->srcpad,
+            gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME, 0, -1, 0));
+        rsvg->need_newsegment = FALSE;
+      }
+
+      if (rsvg->pending_events) {
+        GList *l;
+
+        for (l = rsvg->pending_events; l; l = l->next)
+          gst_pad_push_event (rsvg->srcpad, l->data);
+        g_list_free (rsvg->pending_events);
+        rsvg->pending_events = NULL;
+      }
+
+      if (rsvg->pending_tags) {
+        gst_element_found_tags (GST_ELEMENT_CAST (rsvg), rsvg->pending_tags);
+        rsvg->pending_tags = NULL;
+      }
+
+      ret = gst_pad_push (rsvg->srcpad, outbuf);
+      if (ret != GST_FLOW_OK)
+        break;
+
+      gst_adapter_flush (rsvg->adapter, size);
+      size = gst_adapter_available (rsvg->adapter);
+      continue;
+    } else {
+      break;
+    }
+  }
+
+  gst_object_unref (rsvg);
+
+  return GST_FLOW_OK;
+}
+
+static gboolean
+gst_rsvg_dec_sink_set_caps (GstPad * pad, GstCaps * caps)
+{
+  GstRsvgDec *rsvg = GST_RSVG_DEC (gst_pad_get_parent (pad));
+  gboolean ret = TRUE;
+  GstStructure *s = gst_caps_get_structure (caps, 0);
+
+  gst_structure_get_fraction (s, "framerate", &rsvg->fps_n, &rsvg->fps_d);
+
+  gst_object_unref (rsvg);
+
+  return ret;
+}
+
+static gboolean
+gst_rsvg_dec_sink_event (GstPad * pad, GstEvent * event)
+{
+  GstRsvgDec *rsvg = GST_RSVG_DEC (gst_pad_get_parent (pad));
+  gboolean res = FALSE;
+
+  switch (GST_EVENT_TYPE (event)) {
+    case GST_EVENT_NEWSEGMENT:{
+      gdouble rate, arate;
+      gboolean update;
+      gint64 start, stop, position;
+      GstFormat fmt;
+
+      gst_event_parse_new_segment_full (event, &update, &rate, &arate, &fmt,
+          &start, &stop, &position);
+
+      gst_segment_set_newsegment_full (&rsvg->segment, update, rate, arate,
+          fmt, start, stop, position);
+
+      if (fmt == GST_FORMAT_TIME) {
+        rsvg->need_newsegment = FALSE;
+        res = gst_pad_push_event (rsvg->srcpad, event);
+      } else {
+        gst_event_unref (event);
+        res = TRUE;
+      }
+      break;
+    }
+    case GST_EVENT_EOS:
+    case GST_EVENT_FLUSH_STOP:
+      gst_adapter_clear (rsvg->adapter);
+      /* fall through */
+    case GST_EVENT_FLUSH_START:
+      res = gst_pad_push_event (rsvg->srcpad, event);
+      break;
+    default:
+      if (GST_PAD_CAPS (rsvg->srcpad)) {
+        res = gst_pad_push_event (rsvg->srcpad, event);
+      } else {
+        res = TRUE;
+        rsvg->pending_events = g_list_append (rsvg->pending_events, event);
+      }
+      break;
+  }
+
+  gst_object_unref (rsvg);
+
+  return res;
+}
+
+static gboolean
+gst_rsvg_dec_src_event (GstPad * pad, GstEvent * event)
+{
+  GstRsvgDec *rsvg = GST_RSVG_DEC (gst_pad_get_parent (pad));
+  gboolean res = FALSE;
+
+  switch (GST_EVENT_TYPE (event)) {
+    default:
+      res = gst_pad_push_event (rsvg->sinkpad, event);
+      break;
+  }
+
+  gst_object_unref (rsvg);
+
+  return res;
+}
+
+static const GstQueryType *
+gst_rsvg_dec_src_query_type (GstPad * pad)
+{
+  static const GstQueryType query_types[] = {
+    (GstQueryType) 0
+  };
+
+  return query_types;
+}
+
+static gboolean
+gst_rsvg_dec_src_query (GstPad * pad, GstQuery * query)
+{
+  GstRsvgDec *rsvg = GST_RSVG_DEC (gst_pad_get_parent (pad));
+  gboolean res = TRUE;
+
+  switch (GST_QUERY_TYPE (query)) {
+    default:
+      res = gst_pad_query_default (pad, query);
+      break;
+  }
+
+  gst_object_unref (rsvg);
+
+  return res;
+}
+
+static gboolean
+gst_rsvg_dec_src_set_caps (GstPad * pad, GstCaps * caps)
+{
+  GstRsvgDec *rsvg = GST_RSVG_DEC (gst_pad_get_parent (pad));
+  gboolean ret = TRUE;
+  GstStructure *s = gst_caps_get_structure (caps, 0);
+
+  ret &= gst_structure_get_int (s, "width", &rsvg->width);
+  ret &= gst_structure_get_int (s, "height", &rsvg->height);
+
+  gst_object_unref (rsvg);
+
+  return ret;
+}
+
+static GstStateChangeReturn
+gst_rsvg_dec_change_state (GstElement * element, GstStateChange transition)
+{
+  GstStateChangeReturn res;
+  GstRsvgDec *dec = GST_RSVG_DEC (element);
+
+  switch (transition) {
+    case GST_STATE_CHANGE_READY_TO_PAUSED:
+      break;
+    default:
+      break;
+  }
+
+  res = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
+  if (res == GST_STATE_CHANGE_FAILURE)
+    return res;
+
+  switch (transition) {
+    case GST_STATE_CHANGE_PAUSED_TO_READY:
+      gst_rsvg_dec_reset (dec);
+      break;
+    default:
+      break;
+  }
+
+  return res;
+}

ext/rsvg/gstrsvgdec.h

@@ -0,0 +1,79 @@
+/* GStreamer
+ * Copyright (C) <2009> Sebastian Dröge <sebastian.droege@collabora.co.uk>
+ *
+ * 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_RSVG_DEC_H__
+#define __GST_RSVG_DEC_H__
+
+#include <gst/gst.h>
+#include <gst/base/gstadapter.h>
+#include <gst/video/video.h>
+
+#include <cairo/cairo.h>
+
+#include <librsvg/rsvg.h>
+#include <librsvg/rsvg-cairo.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_RSVG_DEC \
+  (gst_rsvg_dec_get_type())
+#define GST_RSVG_DEC(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_RSVG_DEC,GstRsvgDec))
+#define GST_RSVG_DEC_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_RSVG_DEC,GstRsvgDecClass))
+#define GST_IS_RSVG_DEC(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_RSVG_DEC))
+#define GST_IS_RSVG_DEC_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_RSVG_DEC))
+
+typedef struct _GstRsvgDec GstRsvgDec;
+typedef struct _GstRsvgDecClass GstRsvgDecClass;
+
+struct _GstRsvgDec
+{
+  GstElement  element;
+
+  GstPad     *sinkpad;
+  GstPad     *srcpad;
+
+  gint width, height;
+
+  GList *pending_events;
+  GstTagList *pending_tags;
+
+  gint fps_n, fps_d;
+  GstClockTime timestamp_offset;
+  guint64 frame_count;
+
+  GstSegment segment;
+  gboolean need_newsegment;
+
+  GstAdapter *adapter;
+};
+
+struct _GstRsvgDecClass
+{
+  GstElementClass parent_class;
+};
+
+GType gst_rsvg_dec_get_type (void);
+
+G_END_DECLS
+
+#endif /* __GST_RSVG_DEC_H__ */