ext/cairo/gstcairorender.c - imx-gst-plugins-good - Git at Google

 /* GStreamer
  *
  * Copyright (C) 2006-2009 Lutz Mueller <lutz@topfrose.de>
  *
  * 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-cairorender
  *
  * cairorender encodes a video stream into PDF, SVG, PNG or Postscript
  *
  * <refsect2>
  * <title>Example launch line</title>
  * |[
  * gst-launch videotestsrc num-buffers=3 ! cairorender ! "application/pdf" ! filesink location=test.pdf
  * ]|
  * </refsect2>
  */

 #include "gstcairorender.h"

 #include <cairo.h>
 #include <cairo-features.h>
 #ifdef CAIRO_HAS_PS_SURFACE
 #include <cairo-ps.h>
 #endif
 #ifdef CAIRO_HAS_PDF_SURFACE
 #include <cairo-pdf.h>
 #endif
 #ifdef CAIRO_HAS_SVG_SURFACE
 #include <cairo-svg.h>
 #endif

 #include <gst/video/video.h>

 #include <string.h>

 GST_DEBUG_CATEGORY_STATIC (cairo_render_debug);
 #define GST_CAT_DEFAULT cairo_render_debug

 static gboolean
 gst_cairo_render_event (GstPad * pad, GstEvent * e)
 {
   GstCairoRender *c = GST_CAIRO_RENDER (GST_PAD_PARENT (pad));

   switch (GST_EVENT_TYPE (e)) {
     case GST_EVENT_EOS:
       if (c->surface)
         cairo_surface_finish (c->surface);
       break;
     default:
       break;
   }
   return gst_pad_event_default (pad, e);
 }

 static cairo_status_t
 write_func (void *closure, const unsigned char *data, unsigned int length)
 {
   GstCairoRender *c = GST_CAIRO_RENDER (closure);
   GstBuffer *buf;
   GstFlowReturn r;

   buf = gst_buffer_new ();
   gst_buffer_set_data (buf, (guint8 *) data, length);
   gst_buffer_set_caps (buf, GST_PAD_CAPS (c->src));
   if ((r = gst_pad_push (c->src, buf)) != GST_FLOW_OK) {
     GST_DEBUG_OBJECT (c, "Could not pass on buffer: %s.",
         gst_flow_get_name (r));
     return CAIRO_STATUS_WRITE_ERROR;
   }
   return CAIRO_STATUS_SUCCESS;
 }

 static cairo_status_t
 read_buffer (void *closure, unsigned char *data, unsigned int length)
 {
   GstBuffer *buf = GST_BUFFER (closure);

   if (GST_BUFFER_OFFSET (buf) + length > GST_BUFFER_SIZE (buf))
     return CAIRO_STATUS_READ_ERROR;
   memcpy (data, GST_BUFFER_DATA (buf) + GST_BUFFER_OFFSET (buf), length);
   GST_BUFFER_OFFSET (buf) += length;
   return CAIRO_STATUS_SUCCESS;
 }

 static gboolean
 gst_cairo_render_push_surface (GstCairoRender * c, cairo_surface_t * surface)
 {
   cairo_status_t s = 0;
   cairo_t *cr;

   if (!c->surface) {
     s = cairo_surface_write_to_png_stream (surface, write_func, c);
     cairo_surface_destroy (surface);
     if (s != CAIRO_STATUS_SUCCESS) {
       GST_DEBUG_OBJECT (c, "Could not create PNG stream: %s.",
           cairo_status_to_string (s));
       return FALSE;
     }
     return TRUE;
   }

   cr = cairo_create (c->surface);
   cairo_set_source_surface (cr, surface, 0, 0);
   cairo_paint (cr);
   cairo_show_page (cr);
   cairo_destroy (cr);
   cairo_surface_destroy (surface);
   return (TRUE);
 }

 static GstFlowReturn
 gst_cairo_render_chain (GstPad * pad, GstBuffer * buf)
 {
   GstCairoRender *c = GST_CAIRO_RENDER (GST_PAD_PARENT (pad));
   cairo_surface_t *s;
   gboolean success;

   if (G_UNLIKELY (c->width <= 0 || c->height <= 0 || c->stride <= 0))
     return GST_FLOW_NOT_NEGOTIATED;

   if (c->png) {
     GST_BUFFER_OFFSET (buf) = 0;
     s = cairo_image_surface_create_from_png_stream (read_buffer, buf);
   } else {
     if (c->format == CAIRO_FORMAT_ARGB32) {
       guint i, j;
       guint8 *data = GST_BUFFER_DATA (buf);

       buf = gst_buffer_make_writable (buf);

       /* Cairo ARGB is pre-multiplied with the alpha
        * value, i.e. 0x80008000 is half transparent
        * green
        */
       for (i = 0; i < c->height; i++) {
         for (j = 0; j < c->width; j++) {
 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
           guint8 alpha = data[3];

           data[0] = (data[0] * alpha) >> 8;
           data[1] = (data[1] * alpha) >> 8;
           data[2] = (data[2] * alpha) >> 8;
 #else
           guint8 alpha = data[0];

           data[1] = (data[1] * alpha) >> 8;
           data[2] = (data[2] * alpha) >> 8;
           data[3] = (data[3] * alpha) >> 8;
 #endif
           data += 4;
         }
       }
     }

     s = cairo_image_surface_create_for_data (GST_BUFFER_DATA (buf),
         c->format, c->width, c->height, c->stride);
   }

   success = gst_cairo_render_push_surface (c, s);
   gst_buffer_unref (buf);
   return success ? GST_FLOW_OK : GST_FLOW_ERROR;
 }

 static gboolean
 gst_cairo_render_setcaps_sink (GstPad * pad, GstCaps * caps)
 {
   GstCairoRender *c = GST_CAIRO_RENDER (GST_PAD_PARENT (pad));
   GstStructure *s = gst_caps_get_structure (caps, 0);
   const gchar *mime = gst_structure_get_name (s);
   gint fps_n = 0, fps_d = 1;
   gint w, h;

   GST_DEBUG_OBJECT (c, "Got caps (%s).", mime);
   if ((c->png = !strcmp (mime, "image/png")))
     return TRUE;

   /* Width and height */
   if (!gst_structure_get_int (s, "width", &c->width) ||
       !gst_structure_get_int (s, "height", &c->height)) {
     GST_ERROR_OBJECT (c, "Invalid caps");
     return FALSE;
   }

   /* Colorspace */
   if (!strcmp (mime, "video/x-raw-yuv") || !strcmp (mime, "video/x-raw-grey")) {
     c->format = CAIRO_FORMAT_A8;
     c->stride = GST_ROUND_UP_4 (c->width);
   } else if (!strcmp (mime, "video/x-raw-rgb")) {
     gint bpp;

     if (!gst_structure_get_int (s, "bpp", &bpp)) {
       GST_ERROR_OBJECT (c, "Invalid caps");
       return FALSE;
     }

     c->format = (bpp == 32) ? CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_RGB24;
     c->stride = 4 * c->width;
   } else {
     GST_DEBUG_OBJECT (c, "Unknown mime type '%s'.", mime);
     return FALSE;
   }

   /* Framerate */
   gst_structure_get_fraction (s, "framerate", &fps_n, &fps_d);

   /* Create output caps */
   caps = gst_pad_get_allowed_caps (c->src);
   caps = gst_caps_make_writable (caps);
   gst_caps_truncate (caps);
   s = gst_caps_get_structure (caps, 0);
   mime = gst_structure_get_name (s);
   gst_structure_set (s, "height", G_TYPE_INT, c->height, "width", G_TYPE_INT,
       c->width, "framerate", GST_TYPE_FRACTION, fps_n, fps_d, NULL);

   if (c->surface) {
     cairo_surface_destroy (c->surface);
     c->surface = NULL;
   }

   w = c->width;
   h = c->height;

   GST_DEBUG_OBJECT (c, "Setting src caps %" GST_PTR_FORMAT, caps);
   gst_pad_set_caps (c->src, caps);

 #if CAIRO_HAS_PS_SURFACE
   if (!strcmp (mime, "application/postscript")) {
     c->surface = cairo_ps_surface_create_for_stream (write_func, c, w, h);
   } else
 #endif
 #if CAIRO_HAS_PDF_SURFACE
   if (!strcmp (mime, "application/pdf")) {
     c->surface = cairo_pdf_surface_create_for_stream (write_func, c, w, h);
   } else
 #endif
 #if CAIRO_HAS_SVG_SURFACE
   if (!strcmp (mime, "image/svg+xml")) {
     c->surface = cairo_svg_surface_create_for_stream (write_func, c, w, h);
   } else
 #endif
   {
     gst_caps_unref (caps);
     return FALSE;
   }

   gst_caps_unref (caps);

   return TRUE;
 }

 static GstStaticPadTemplate t_src = GST_STATIC_PAD_TEMPLATE ("src",
     GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS (
 #if CAIRO_HAS_PDF_SURFACE
         "application/pdf, "
         "width = (int) [ 1, MAX], " "height = (int) [ 1, MAX] "
 #endif
 #if CAIRO_HAS_PDF_SURFACE && (CAIRO_HAS_PS_SURFACE || CAIRO_HAS_SVG_SURFACE || CAIRO_HAS_PNG_FUNCTIONS)
         ";"
 #endif
 #if CAIRO_HAS_PS_SURFACE
         "application/postscript, "
         "width = (int) [ 1, MAX], " "height = (int) [ 1, MAX] "
 #endif
 #if (CAIRO_HAS_PDF_SURFACE || CAIRO_HAS_PS_SURFACE) && (CAIRO_HAS_SVG_SURFACE || CAIRO_HAS_PNG_FUNCTIONS)
         ";"
 #endif
 #if CAIRO_HAS_SVG_SURFACE
         "image/svg+xml, "
         "width = (int) [ 1, MAX], " "height = (int) [ 1, MAX] "
 #endif
 #if (CAIRO_HAS_PDF_SURFACE || CAIRO_HAS_PS_SURFACE || CAIRO_HAS_SVG_SURFACE) && CAIRO_HAS_PNG_FUNCTIONS
         ";"
 #endif
 #if CAIRO_HAS_PNG_FUNCTIONS
         "image/png, " "width = (int) [ 1, MAX], " "height = (int) [ 1, MAX] "
 #endif
     ));
 static GstStaticPadTemplate t_snk = GST_STATIC_PAD_TEMPLATE ("sink",
     GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS (
 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
         GST_VIDEO_CAPS_BGRx " ; " GST_VIDEO_CAPS_BGRA " ; "
 #else
         GST_VIDEO_CAPS_xRGB " ; " GST_VIDEO_CAPS_ARGB " ; "
 #endif
         GST_VIDEO_CAPS_YUV ("Y800") " ; "
         "video/x-raw-gray, "
         "bpp = 8, "
         "depth = 8, "
         "width = " GST_VIDEO_SIZE_RANGE ", "
         "height = " GST_VIDEO_SIZE_RANGE ", " "framerate = " GST_VIDEO_FPS_RANGE
         " ; "
 #if CAIRO_HAS_PNG_FUNCTIONS
         "image/png, "
         "width = " GST_VIDEO_SIZE_RANGE ", " "height = " GST_VIDEO_SIZE_RANGE
 #endif
     ));

 GST_BOILERPLATE (GstCairoRender, gst_cairo_render, GstElement,
     GST_TYPE_ELEMENT);

 static void
 gst_cairo_render_init (GstCairoRender * c, GstCairoRenderClass * klass)
 {
   /* The sink */
   c->snk =
       gst_pad_new_from_template (gst_static_pad_template_get (&t_snk), "sink");
   gst_pad_set_event_function (c->snk, gst_cairo_render_event);
   gst_pad_set_chain_function (c->snk, gst_cairo_render_chain);
   gst_pad_set_setcaps_function (c->snk, gst_cairo_render_setcaps_sink);
   gst_pad_use_fixed_caps (c->snk);
   gst_element_add_pad (GST_ELEMENT (c), c->snk);

   /* The source */
   c->src =
       gst_pad_new_from_template (gst_static_pad_template_get (&t_src), "src");
   gst_pad_use_fixed_caps (c->src);
   gst_element_add_pad (GST_ELEMENT (c), c->src);

   c->width = 0;
   c->height = 0;
   c->stride = 0;
 }

 static void
 gst_cairo_render_base_init (gpointer g_class)
 {
   GstElementClass *ec = GST_ELEMENT_CLASS (g_class);

   gst_element_class_set_details_simple (ec, "Cairo encoder",
       "Codec/Encoder", "Encodes streams using Cairo",
       "Lutz Mueller <lutz@topfrose.de>");
   gst_element_class_add_pad_template (ec, gst_static_pad_template_get (&t_snk));
   gst_element_class_add_pad_template (ec, gst_static_pad_template_get (&t_src));
 }

 static void
 gst_cairo_render_finalize (GObject * object)
 {
   GstCairoRender *c = GST_CAIRO_RENDER (object);

   if (c->surface) {
     cairo_surface_destroy (c->surface);
     c->surface = NULL;
   }

   G_OBJECT_CLASS (parent_class)->finalize (object);
 }

 static void
 gst_cairo_render_class_init (GstCairoRenderClass * klass)
 {
   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);

   gobject_class->finalize = gst_cairo_render_finalize;

   GST_DEBUG_CATEGORY_INIT (cairo_render_debug, "cairo_render", 0,
       "Cairo encoder");
 }
	/* GStreamer
	*
	* Copyright (C) 2006-2009 Lutz Mueller <lutz@topfrose.de>
	*
	* 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-cairorender
	*
	* cairorender encodes a video stream into PDF, SVG, PNG or Postscript
	*
	* <refsect2>
	* <title>Example launch line</title>
	* \|[
	* gst-launch videotestsrc num-buffers=3 ! cairorender ! "application/pdf" ! filesink location=test.pdf
	* ]\|
	* </refsect2>
	*/

	#include "gstcairorender.h"

	#include <cairo.h>
	#include <cairo-features.h>
	#ifdef CAIRO_HAS_PS_SURFACE
	#include <cairo-ps.h>
	#endif
	#ifdef CAIRO_HAS_PDF_SURFACE
	#include <cairo-pdf.h>
	#endif
	#ifdef CAIRO_HAS_SVG_SURFACE
	#include <cairo-svg.h>
	#endif

	#include <gst/video/video.h>

	#include <string.h>

	GST_DEBUG_CATEGORY_STATIC (cairo_render_debug);
	#define GST_CAT_DEFAULT cairo_render_debug

	static gboolean
	gst_cairo_render_event (GstPad * pad, GstEvent * e)
	{
	GstCairoRender *c = GST_CAIRO_RENDER (GST_PAD_PARENT (pad));

	switch (GST_EVENT_TYPE (e)) {
	case GST_EVENT_EOS:
	if (c->surface)
	cairo_surface_finish (c->surface);
	break;
	default:
	break;
	}
	return gst_pad_event_default (pad, e);
	}

	static cairo_status_t
	write_func (void closure, const unsigned char data, unsigned int length)
	{
	GstCairoRender *c = GST_CAIRO_RENDER (closure);
	GstBuffer *buf;
	GstFlowReturn r;

	buf = gst_buffer_new ();
	gst_buffer_set_data (buf, (guint8 *) data, length);
	gst_buffer_set_caps (buf, GST_PAD_CAPS (c->src));
	if ((r = gst_pad_push (c->src, buf)) != GST_FLOW_OK) {
	GST_DEBUG_OBJECT (c, "Could not pass on buffer: %s.",
	gst_flow_get_name (r));
	return CAIRO_STATUS_WRITE_ERROR;
	}
	return CAIRO_STATUS_SUCCESS;
	}

	static cairo_status_t
	read_buffer (void closure, unsigned char data, unsigned int length)
	{
	GstBuffer *buf = GST_BUFFER (closure);

	if (GST_BUFFER_OFFSET (buf) + length > GST_BUFFER_SIZE (buf))
	return CAIRO_STATUS_READ_ERROR;
	memcpy (data, GST_BUFFER_DATA (buf) + GST_BUFFER_OFFSET (buf), length);
	GST_BUFFER_OFFSET (buf) += length;
	return CAIRO_STATUS_SUCCESS;
	}

	static gboolean
	gst_cairo_render_push_surface (GstCairoRender * c, cairo_surface_t * surface)
	{
	cairo_status_t s = 0;
	cairo_t *cr;

	if (!c->surface) {
	s = cairo_surface_write_to_png_stream (surface, write_func, c);
	cairo_surface_destroy (surface);
	if (s != CAIRO_STATUS_SUCCESS) {
	GST_DEBUG_OBJECT (c, "Could not create PNG stream: %s.",
	cairo_status_to_string (s));
	return FALSE;
	}
	return TRUE;
	}

	cr = cairo_create (c->surface);
	cairo_set_source_surface (cr, surface, 0, 0);
	cairo_paint (cr);
	cairo_show_page (cr);
	cairo_destroy (cr);
	cairo_surface_destroy (surface);
	return (TRUE);
	}

	static GstFlowReturn
	gst_cairo_render_chain (GstPad * pad, GstBuffer * buf)
	{
	GstCairoRender *c = GST_CAIRO_RENDER (GST_PAD_PARENT (pad));
	cairo_surface_t *s;
	gboolean success;

	if (G_UNLIKELY (c->width <= 0 \|\| c->height <= 0 \|\| c->stride <= 0))
	return GST_FLOW_NOT_NEGOTIATED;

	if (c->png) {
	GST_BUFFER_OFFSET (buf) = 0;
	s = cairo_image_surface_create_from_png_stream (read_buffer, buf);
	} else {
	if (c->format == CAIRO_FORMAT_ARGB32) {
	guint i, j;
	guint8 *data = GST_BUFFER_DATA (buf);

	buf = gst_buffer_make_writable (buf);

	/* Cairo ARGB is pre-multiplied with the alpha
	* value, i.e. 0x80008000 is half transparent
	* green
	*/
	for (i = 0; i < c->height; i++) {
	for (j = 0; j < c->width; j++) {
	#if G_BYTE_ORDER == G_LITTLE_ENDIAN
	guint8 alpha = data[3];

	data[0] = (data[0] * alpha) >> 8;
	data[1] = (data[1] * alpha) >> 8;
	data[2] = (data[2] * alpha) >> 8;
	#else
	guint8 alpha = data[0];

	data[1] = (data[1] * alpha) >> 8;
	data[2] = (data[2] * alpha) >> 8;
	data[3] = (data[3] * alpha) >> 8;
	#endif
	data += 4;
	}
	}
	}

	s = cairo_image_surface_create_for_data (GST_BUFFER_DATA (buf),
	c->format, c->width, c->height, c->stride);
	}

	success = gst_cairo_render_push_surface (c, s);
	gst_buffer_unref (buf);
	return success ? GST_FLOW_OK : GST_FLOW_ERROR;
	}

	static gboolean
	gst_cairo_render_setcaps_sink (GstPad * pad, GstCaps * caps)
	{
	GstCairoRender *c = GST_CAIRO_RENDER (GST_PAD_PARENT (pad));
	GstStructure *s = gst_caps_get_structure (caps, 0);
	const gchar *mime = gst_structure_get_name (s);
	gint fps_n = 0, fps_d = 1;
	gint w, h;

	GST_DEBUG_OBJECT (c, "Got caps (%s).", mime);
	if ((c->png = !strcmp (mime, "image/png")))
	return TRUE;

	/* Width and height */
	if (!gst_structure_get_int (s, "width", &c->width) \|\|
	!gst_structure_get_int (s, "height", &c->height)) {
	GST_ERROR_OBJECT (c, "Invalid caps");
	return FALSE;
	}

	/* Colorspace */
	if (!strcmp (mime, "video/x-raw-yuv") \|\| !strcmp (mime, "video/x-raw-grey")) {
	c->format = CAIRO_FORMAT_A8;
	c->stride = GST_ROUND_UP_4 (c->width);
	} else if (!strcmp (mime, "video/x-raw-rgb")) {
	gint bpp;

	if (!gst_structure_get_int (s, "bpp", &bpp)) {
	GST_ERROR_OBJECT (c, "Invalid caps");
	return FALSE;
	}

	c->format = (bpp == 32) ? CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_RGB24;
	c->stride = 4 * c->width;
	} else {
	GST_DEBUG_OBJECT (c, "Unknown mime type '%s'.", mime);
	return FALSE;
	}

	/* Framerate */
	gst_structure_get_fraction (s, "framerate", &fps_n, &fps_d);

	/* Create output caps */
	caps = gst_pad_get_allowed_caps (c->src);
	caps = gst_caps_make_writable (caps);
	gst_caps_truncate (caps);
	s = gst_caps_get_structure (caps, 0);
	mime = gst_structure_get_name (s);
	gst_structure_set (s, "height", G_TYPE_INT, c->height, "width", G_TYPE_INT,
	c->width, "framerate", GST_TYPE_FRACTION, fps_n, fps_d, NULL);

	if (c->surface) {
	cairo_surface_destroy (c->surface);
	c->surface = NULL;
	}

	w = c->width;
	h = c->height;

	GST_DEBUG_OBJECT (c, "Setting src caps %" GST_PTR_FORMAT, caps);
	gst_pad_set_caps (c->src, caps);

	#if CAIRO_HAS_PS_SURFACE
	if (!strcmp (mime, "application/postscript")) {
	c->surface = cairo_ps_surface_create_for_stream (write_func, c, w, h);
	} else
	#endif
	#if CAIRO_HAS_PDF_SURFACE
	if (!strcmp (mime, "application/pdf")) {
	c->surface = cairo_pdf_surface_create_for_stream (write_func, c, w, h);
	} else
	#endif
	#if CAIRO_HAS_SVG_SURFACE
	if (!strcmp (mime, "image/svg+xml")) {
	c->surface = cairo_svg_surface_create_for_stream (write_func, c, w, h);
	} else
	#endif
	{
	gst_caps_unref (caps);
	return FALSE;
	}

	gst_caps_unref (caps);

	return TRUE;
	}

	static GstStaticPadTemplate t_src = GST_STATIC_PAD_TEMPLATE ("src",
	GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS (
	#if CAIRO_HAS_PDF_SURFACE
	"application/pdf, "
	"width = (int) [ 1, MAX], " "height = (int) [ 1, MAX] "
	#endif
	#if CAIRO_HAS_PDF_SURFACE && (CAIRO_HAS_PS_SURFACE \|\| CAIRO_HAS_SVG_SURFACE \|\| CAIRO_HAS_PNG_FUNCTIONS)
	";"
	#endif
	#if CAIRO_HAS_PS_SURFACE
	"application/postscript, "
	"width = (int) [ 1, MAX], " "height = (int) [ 1, MAX] "
	#endif
	#if (CAIRO_HAS_PDF_SURFACE \|\| CAIRO_HAS_PS_SURFACE) && (CAIRO_HAS_SVG_SURFACE \|\| CAIRO_HAS_PNG_FUNCTIONS)
	";"
	#endif
	#if CAIRO_HAS_SVG_SURFACE
	"image/svg+xml, "
	"width = (int) [ 1, MAX], " "height = (int) [ 1, MAX] "
	#endif
	#if (CAIRO_HAS_PDF_SURFACE \|\| CAIRO_HAS_PS_SURFACE \|\| CAIRO_HAS_SVG_SURFACE) && CAIRO_HAS_PNG_FUNCTIONS
	";"
	#endif
	#if CAIRO_HAS_PNG_FUNCTIONS
	"image/png, " "width = (int) [ 1, MAX], " "height = (int) [ 1, MAX] "
	#endif
	));
	static GstStaticPadTemplate t_snk = GST_STATIC_PAD_TEMPLATE ("sink",
	GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS (
	#if G_BYTE_ORDER == G_LITTLE_ENDIAN
	GST_VIDEO_CAPS_BGRx " ; " GST_VIDEO_CAPS_BGRA " ; "
	#else
	GST_VIDEO_CAPS_xRGB " ; " GST_VIDEO_CAPS_ARGB " ; "
	#endif
	GST_VIDEO_CAPS_YUV ("Y800") " ; "
	"video/x-raw-gray, "
	"bpp = 8, "
	"depth = 8, "
	"width = " GST_VIDEO_SIZE_RANGE ", "
	"height = " GST_VIDEO_SIZE_RANGE ", " "framerate = " GST_VIDEO_FPS_RANGE
	" ; "
	#if CAIRO_HAS_PNG_FUNCTIONS
	"image/png, "
	"width = " GST_VIDEO_SIZE_RANGE ", " "height = " GST_VIDEO_SIZE_RANGE
	#endif
	));

	GST_BOILERPLATE (GstCairoRender, gst_cairo_render, GstElement,
	GST_TYPE_ELEMENT);

	static void
	gst_cairo_render_init (GstCairoRender * c, GstCairoRenderClass * klass)
	{
	/* The sink */
	c->snk =
	gst_pad_new_from_template (gst_static_pad_template_get (&t_snk), "sink");
	gst_pad_set_event_function (c->snk, gst_cairo_render_event);
	gst_pad_set_chain_function (c->snk, gst_cairo_render_chain);
	gst_pad_set_setcaps_function (c->snk, gst_cairo_render_setcaps_sink);
	gst_pad_use_fixed_caps (c->snk);
	gst_element_add_pad (GST_ELEMENT (c), c->snk);

	/* The source */
	c->src =
	gst_pad_new_from_template (gst_static_pad_template_get (&t_src), "src");
	gst_pad_use_fixed_caps (c->src);
	gst_element_add_pad (GST_ELEMENT (c), c->src);

	c->width = 0;
	c->height = 0;
	c->stride = 0;
	}

	static void
	gst_cairo_render_base_init (gpointer g_class)
	{
	GstElementClass *ec = GST_ELEMENT_CLASS (g_class);

	gst_element_class_set_details_simple (ec, "Cairo encoder",
	"Codec/Encoder", "Encodes streams using Cairo",
	"Lutz Mueller <lutz@topfrose.de>");
	gst_element_class_add_pad_template (ec, gst_static_pad_template_get (&t_snk));
	gst_element_class_add_pad_template (ec, gst_static_pad_template_get (&t_src));
	}

	static void
	gst_cairo_render_finalize (GObject * object)
	{
	GstCairoRender *c = GST_CAIRO_RENDER (object);

	if (c->surface) {
	cairo_surface_destroy (c->surface);
	c->surface = NULL;
	}

	G_OBJECT_CLASS (parent_class)->finalize (object);
	}

	static void
	gst_cairo_render_class_init (GstCairoRenderClass * klass)
	{
	GObjectClass *gobject_class = G_OBJECT_CLASS (klass);

	gobject_class->finalize = gst_cairo_render_finalize;

	GST_DEBUG_CATEGORY_INIT (cairo_render_debug, "cairo_render", 0,
	"Cairo encoder");
	}