ext/lcs/gstcolorspace.c - imx-gst-plugins-bad - Git at Google

 /* 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.
  */

 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 #include <gst/gst.h>
 #include <gst/video/video.h>
 #include <lcs/lcs.h>
 #include <string.h>

 #define GST_TYPE_COLORSPACE \
   (gst_colorspace_get_type())
 #define GST_COLORSPACE(obj) \
   (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_COLORSPACE,GstColorspace))
 #define GST_COLORSPACE_CLASS(klass) \
   (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ULAW,GstColorspace))
 #define GST_IS_COLORSPACE(obj) \
   (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_COLORSPACE))
 #define GST_IS_COLORSPACE_CLASS(obj) \
   (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_COLORSPACE))

 typedef struct _GstColorspace GstColorspace;
 typedef struct _GstColorspaceClass GstColorspaceClass;

 struct _GstColorspace
 {
   GstElement element;

   GstPad *sinkpad, *srcpad;

   LCSConverter *converter;

   gboolean passthrough;
   gint width, height;
   double framerate;
   gboolean disabled;
 };

 struct _GstColorspaceClass
 {
   GstElementClass parent_class;
 };

 /* elementfactory information */
 static GstElementDetails colorspace_details = {
   "Colorspace converter",
   "Filter/Effect",
   "Converts video from one colorspace to another",
   "Wim Taymans <wim.taymans@chello.be>"
 };


 /* Stereo signals and args */
 enum
 {
   /* FILL ME */
   LAST_SIGNAL
 };

 enum
 {
   ARG_0,
   ARG_SOURCE,
   ARG_DEST
 };

 static GType gst_colorspace_get_type (void);

 static void gst_colorspace_class_init (GstColorspaceClass * klass);
 static void gst_colorspace_base_init (GstColorspaceClass * klass);
 static void gst_colorspace_init (GstColorspace * space);

 static void gst_colorspace_set_property (GObject * object, guint prop_id,
     const GValue * value, GParamSpec * pspec);
 static void gst_colorspace_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec);

 static GstPadLinkReturn
 gst_colorspace_link (GstPad * pad, const GstCaps * caps);
 static void gst_colorspace_chain (GstPad * pad, GstData * _data);
 static GstElementStateReturn gst_colorspace_change_state (GstElement * element);

 static GstElementClass *parent_class = NULL;

 /*static guint gst_colorspace_signals[LAST_SIGNAL] = { 0 }; */

 static GstStaticPadTemplate gst_colorspace_src_template =
     GST_STATIC_PAD_TEMPLATE ("src",
     GST_PAD_SRC,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB "; "
         GST_VIDEO_CAPS_BGR "; "
         GST_VIDEO_CAPS_RGBx "; "
         GST_VIDEO_CAPS_xRGB "; "
         GST_VIDEO_CAPS_BGRx "; "
         GST_VIDEO_CAPS_xBGR "; "
         GST_VIDEO_CAPS_RGB_16 "; "
         GST_VIDEO_CAPS_RGB_15 "; "
         GST_VIDEO_CAPS_YUV ("{ I420, YV12, YUY2, YVYU, UYVY, YUV9, YVU9, "
             "Y800, Y41P, Y41B, Y42B, IUY2 }")
     )
     );

 static GstStaticPadTemplate gst_colorspace_sink_template =
     GST_STATIC_PAD_TEMPLATE ("sink",
     GST_PAD_SINK,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB "; "
         GST_VIDEO_CAPS_BGR "; "
         GST_VIDEO_CAPS_RGBx "; "
         GST_VIDEO_CAPS_xRGB "; "
         GST_VIDEO_CAPS_BGRx "; "
         GST_VIDEO_CAPS_xBGR "; "
         GST_VIDEO_CAPS_RGB_16 "; "
         GST_VIDEO_CAPS_RGB_15 "; "
         GST_VIDEO_CAPS_YUV ("{ I420, YV12, YUY2, YVYU, UYVY, YUV9, YVU9, "
             "Y800, Y41P, Y41B, Y42B, IUY2 }")
     )
     );

 static const LCSFormat *
 colorspace_find_lcs_format (const GstCaps * caps)
 {
   const LCSFormat *format = NULL;
   const char *name;
   const GstStructure *structure = gst_caps_get_structure (caps, 0);

   name = gst_structure_get_name (structure);

   if (strcmp (name, "video/x-raw-rgb") == 0) {
     LCSRGBPackedFormat *rgb_fmt = g_new (LCSRGBPackedFormat, 1);
     gint mask;
     gchar *format_name;
     int endianness;

     format = (const LCSFormat *) rgb_fmt;

     ((LCSFormat *) rgb_fmt)->type = LCS_FORMAT_RGB_PACKED;
     gst_structure_get_int (structure, "bpp",
         &((LCSFormat *) rgb_fmt)->bits_per_pixel);
     gst_structure_get_int (structure, "red_mask", &mask);
     lcs_utils_mask_to_shift (mask, &rgb_fmt->bits_per_component[LCS_R],
         &rgb_fmt->component_bit_offset[LCS_R]);
     gst_structure_get_int (structure, "green_mask", &mask);
     lcs_utils_mask_to_shift (mask, &rgb_fmt->bits_per_component[LCS_G],
         &rgb_fmt->component_bit_offset[LCS_G]);
     gst_structure_get_int (structure, "blue_mask", &mask);
     lcs_utils_mask_to_shift (mask, &rgb_fmt->bits_per_component[LCS_B],
         &rgb_fmt->component_bit_offset[LCS_B]);
     rgb_fmt->bits_per_component[LCS_A] = 0;
     rgb_fmt->component_bit_offset[LCS_A] = 0;
     gst_structure_get_int (structure, "endianness", &endianness);
     rgb_fmt->endianness = endianness;

     format_name = g_strdup_printf ("GST_RGB_%d", format->bits_per_pixel);
     lcs_register_format (format_name, (LCSFormat *) rgb_fmt, 1);
   } else if (strcmp (name, "video/x-raw-yuv") == 0) {
     guint32 space;
     gchar fourcc[5];

     gst_structure_get_fourcc (structure, "format", &space);
     lcs_utils_fourcc_to_string (space, fourcc);
     fourcc[4] = '\0';
     format = lcs_find_format (fourcc);
   } else {
     g_assert_not_reached ();
   }

   return format;
 }

 static guint32
 gst_colorspace_caps_get_fourcc (const GstCaps * caps)
 {
   guint32 format;
   GstStructure *structure;

   structure = gst_caps_get_structure (caps, 0);
   if (strcmp (gst_structure_get_name (structure), "video/x-raw-rgb") == 0) {
     format = GST_MAKE_FOURCC ('R', 'G', 'B', ' ');
   } else {
     gst_structure_get_fourcc (structure, "format", &format);
   }
   return format;
 }

 static gboolean
 colorspace_setup_converter (GstColorspace * space, const GstCaps * from_caps,
     const GstCaps * to_caps)
 {
   const LCSFormat *from_format = NULL;
   const LCSFormat *to_format = NULL;
   guint32 from_space, to_space;

   g_return_val_if_fail (to_caps != NULL, FALSE);
   g_return_val_if_fail (from_caps != NULL, FALSE);

   from_space = gst_colorspace_caps_get_fourcc (from_caps);
   to_space = gst_colorspace_caps_get_fourcc (to_caps);

   from_format = colorspace_find_lcs_format (from_caps);
   to_format = colorspace_find_lcs_format (to_caps);

   GST_DEBUG ("trying from " GST_FOURCC_FORMAT " to " GST_FOURCC_FORMAT,
       GST_FOURCC_ARGS (from_space), GST_FOURCC_ARGS (to_space));
   space->converter = lcs_find_converter (from_format, to_format, LCS_FLAG_FAST);

   if (space->converter) {
     GST_DEBUG ("trying from " GST_FOURCC_FORMAT " to " GST_FOURCC_FORMAT,
         GST_FOURCC_ARGS (from_space), GST_FOURCC_ARGS (to_space));
     space->disabled = FALSE;
     return TRUE;
   }

   return FALSE;
 }

 static GstCaps *
 gst_colorspace_getcaps (GstPad * pad)
 {
 #if unused
   GstColorspace *space;
   GstCaps *result;
   GstCaps *peercaps;
   GstCaps *ourcaps;

   space = GST_COLORSPACE (gst_pad_get_parent (pad));

   /* we can do everything our peer can... */
   peercaps = gst_caps_copy (gst_pad_get_allowed_caps (space->srcpad));
   /* and our own template of course */
   ourcaps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));

   /* merge them together, we prefer the peercaps first */
   result = gst_caps_prepend (ourcaps, peercaps);

   return result;
 #endif
   return gst_caps_copy (gst_pad_get_pad_template_caps (pad));
 }

 static GstPadLinkReturn
 gst_colorspace_link (GstPad * pad, const GstCaps * caps)
 {
   GstStructure *structure;
   GstPad *otherpad;
   GstCaps *othercaps;
   GstColorspace *space;
   int width;
   int height;
   double framerate;
   GstPadLinkReturn ret;

   space = GST_COLORSPACE (gst_pad_get_parent (pad));

   otherpad = (pad == space->srcpad) ? space->sinkpad : space->srcpad;

   structure = gst_caps_get_structure (caps, 0);

   gst_structure_get_int (structure, "width", &width);
   gst_structure_get_int (structure, "height", &height);
   gst_structure_get_double (structure, "framerate", &framerate);

   ret = gst_pad_try_set_caps (otherpad, caps);
   if (GST_PAD_LINK_SUCCESSFUL (ret)) {
     /* passthrough */
     space->passthrough = TRUE;
     return GST_PAD_LINK_OK;
   }
   space->passthrough = FALSE;

   if (gst_pad_is_negotiated (otherpad)) {
     othercaps = gst_caps_copy (gst_pad_get_negotiated_caps (otherpad));

     gst_caps_set_simple (othercaps,
         "width", G_TYPE_INT, width,
         "height", G_TYPE_INT, height,
         "framerate", G_TYPE_DOUBLE, framerate, NULL);

     ret = gst_pad_try_set_caps (otherpad, othercaps);
     if (!GST_PAD_LINK_SUCCESSFUL (ret)) {
       return ret;
     }

     if (colorspace_setup_converter (space, caps, othercaps)) {

       space->width = width;
       space->height = height;
       space->framerate = framerate;
     } else {
       return GST_PAD_LINK_REFUSED;
     }
   }

   return GST_PAD_LINK_OK;
 }

 static GType
 gst_colorspace_get_type (void)
 {
   static GType colorspace_type = 0;

   if (!colorspace_type) {
     static const GTypeInfo colorspace_info = {
       sizeof (GstColorspaceClass),
       (GBaseInitFunc) gst_colorspace_base_init,
       NULL,
       (GClassInitFunc) gst_colorspace_class_init,
       NULL,
       NULL,
       sizeof (GstColorspace),
       0,
       (GInstanceInitFunc) gst_colorspace_init,
     };

     colorspace_type =
         g_type_register_static (GST_TYPE_ELEMENT, "GstColorspaceLCS",
         &colorspace_info, 0);
   }
   return colorspace_type;
 }

 static void
 gst_colorspace_base_init (GstColorspaceClass * klass)
 {
   GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

   gst_element_class_add_pad_template (element_class,
       gst_static_pad_template_get (&gst_colorspace_src_template));
   gst_element_class_add_pad_template (element_class,
       gst_static_pad_template_get (&gst_colorspace_sink_template));
   gst_element_class_set_details (element_class, &colorspace_details);
 }

 static void
 gst_colorspace_class_init (GstColorspaceClass * 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_colorspace_set_property;
   gobject_class->get_property = gst_colorspace_get_property;

   gstelement_class->change_state = gst_colorspace_change_state;
 }

 static void
 gst_colorspace_init (GstColorspace * space)
 {
   space->sinkpad =
       gst_pad_new_from_template (gst_static_pad_template_get
       (&gst_colorspace_sink_template), "sink");
   gst_pad_set_link_function (space->sinkpad, gst_colorspace_link);
   gst_pad_set_getcaps_function (space->sinkpad, gst_colorspace_getcaps);
   gst_pad_set_chain_function (space->sinkpad, gst_colorspace_chain);
   gst_element_add_pad (GST_ELEMENT (space), space->sinkpad);

   space->srcpad =
       gst_pad_new_from_template (gst_static_pad_template_get
       (&gst_colorspace_src_template), "src");
   gst_element_add_pad (GST_ELEMENT (space), space->srcpad);
   gst_pad_set_link_function (space->srcpad, gst_colorspace_link);

   space->disabled = TRUE;
 }

 static void
 gst_colorspace_chain (GstPad * pad, GstData * _data)
 {
   GstBuffer *buf = GST_BUFFER (_data);
   GstColorspace *space;
   GstBuffer *outbuf;

   g_return_if_fail (pad != NULL);
   g_return_if_fail (GST_IS_PAD (pad));
   g_return_if_fail (buf != NULL);

   space = GST_COLORSPACE (gst_pad_get_parent (pad));

   g_return_if_fail (space != NULL);
   g_return_if_fail (GST_IS_COLORSPACE (space));

   if (space->passthrough) {
     outbuf = buf;
   } else {
     unsigned long size;

     lcs_format_buffer_size (lcs_converter_get_dest_format (space->converter),
         space->width, space->height, &size);

     outbuf = gst_pad_alloc_buffer (space->srcpad, GST_BUFFER_OFFSET_NONE, size);

     lcs_convert_auto (space->converter,
         GST_BUFFER_DATA (buf),
         GST_BUFFER_DATA (outbuf), space->width, space->height);

     GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buf);
     GST_BUFFER_DURATION (outbuf) = GST_BUFFER_DURATION (buf);

     gst_buffer_unref (buf);
   }
   gst_pad_push (space->srcpad, GST_DATA (outbuf));
 }

 static GstElementStateReturn
 gst_colorspace_change_state (GstElement * element)
 {
   GstColorspace *space;

   space = GST_COLORSPACE (element);

   switch (GST_STATE_TRANSITION (element)) {
     case GST_STATE_PAUSED_TO_READY:
       break;
   }

   parent_class->change_state (element);

   return GST_STATE_SUCCESS;
 }

 static void
 gst_colorspace_set_property (GObject * object, guint prop_id,
     const GValue * value, GParamSpec * pspec)
 {
   GstColorspace *space;

   g_return_if_fail (GST_IS_COLORSPACE (object));
   space = GST_COLORSPACE (object);

   switch (prop_id) {
     default:
       break;
   }
 }

 static void
 gst_colorspace_get_property (GObject * object, guint prop_id, GValue * value,
     GParamSpec * pspec)
 {
   GstColorspace *space;

   g_return_if_fail (GST_IS_COLORSPACE (object));
   space = GST_COLORSPACE (object);

   switch (prop_id) {
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
   }
 }

 static gboolean
 plugin_init (GstPlugin * plugin)
 {
   lcs_init (NULL, NULL);

   return gst_element_register (plugin, "lcscolorspace", GST_RANK_NONE,
       GST_TYPE_COLORSPACE);
 }


 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
     GST_VERSION_MINOR,
     "colorspacelcs",
     "LCS colorspace convertor",
     plugin_init, VERSION, "LGPL", GST_PACKAGE, GST_ORIGIN)
	/* 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.
	*/

	#ifdef HAVE_CONFIG_H
	#include "config.h"
	#endif
	#include <gst/gst.h>
	#include <gst/video/video.h>
	#include <lcs/lcs.h>
	#include <string.h>

	#define GST_TYPE_COLORSPACE \
	(gst_colorspace_get_type())
	#define GST_COLORSPACE(obj) \
	(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_COLORSPACE,GstColorspace))
	#define GST_COLORSPACE_CLASS(klass) \
	(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ULAW,GstColorspace))
	#define GST_IS_COLORSPACE(obj) \
	(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_COLORSPACE))
	#define GST_IS_COLORSPACE_CLASS(obj) \
	(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_COLORSPACE))

	typedef struct _GstColorspace GstColorspace;
	typedef struct _GstColorspaceClass GstColorspaceClass;

	struct _GstColorspace
	{
	GstElement element;

	GstPad sinkpad, srcpad;

	LCSConverter *converter;

	gboolean passthrough;
	gint width, height;
	double framerate;
	gboolean disabled;
	};

	struct _GstColorspaceClass
	{
	GstElementClass parent_class;
	};

	/* elementfactory information */
	static GstElementDetails colorspace_details = {
	"Colorspace converter",
	"Filter/Effect",
	"Converts video from one colorspace to another",
	"Wim Taymans <wim.taymans@chello.be>"
	};


	/* Stereo signals and args */
	enum
	{
	/* FILL ME */
	LAST_SIGNAL
	};

	enum
	{
	ARG_0,
	ARG_SOURCE,
	ARG_DEST
	};

	static GType gst_colorspace_get_type (void);

	static void gst_colorspace_class_init (GstColorspaceClass * klass);
	static void gst_colorspace_base_init (GstColorspaceClass * klass);
	static void gst_colorspace_init (GstColorspace * space);

	static void gst_colorspace_set_property (GObject * object, guint prop_id,
	const GValue * value, GParamSpec * pspec);
	static void gst_colorspace_get_property (GObject * object, guint prop_id,
	GValue * value, GParamSpec * pspec);

	static GstPadLinkReturn
	gst_colorspace_link (GstPad * pad, const GstCaps * caps);
	static void gst_colorspace_chain (GstPad * pad, GstData * _data);
	static GstElementStateReturn gst_colorspace_change_state (GstElement * element);

	static GstElementClass *parent_class = NULL;

	/static guint gst_colorspace_signals[LAST_SIGNAL] = { 0 }; /

	static GstStaticPadTemplate gst_colorspace_src_template =
	GST_STATIC_PAD_TEMPLATE ("src",
	GST_PAD_SRC,
	GST_PAD_ALWAYS,
	GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB "; "
	GST_VIDEO_CAPS_BGR "; "
	GST_VIDEO_CAPS_RGBx "; "
	GST_VIDEO_CAPS_xRGB "; "
	GST_VIDEO_CAPS_BGRx "; "
	GST_VIDEO_CAPS_xBGR "; "
	GST_VIDEO_CAPS_RGB_16 "; "
	GST_VIDEO_CAPS_RGB_15 "; "
	GST_VIDEO_CAPS_YUV ("{ I420, YV12, YUY2, YVYU, UYVY, YUV9, YVU9, "
	"Y800, Y41P, Y41B, Y42B, IUY2 }")
	)
	);

	static GstStaticPadTemplate gst_colorspace_sink_template =
	GST_STATIC_PAD_TEMPLATE ("sink",
	GST_PAD_SINK,
	GST_PAD_ALWAYS,
	GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB "; "
	GST_VIDEO_CAPS_BGR "; "
	GST_VIDEO_CAPS_RGBx "; "
	GST_VIDEO_CAPS_xRGB "; "
	GST_VIDEO_CAPS_BGRx "; "
	GST_VIDEO_CAPS_xBGR "; "
	GST_VIDEO_CAPS_RGB_16 "; "
	GST_VIDEO_CAPS_RGB_15 "; "
	GST_VIDEO_CAPS_YUV ("{ I420, YV12, YUY2, YVYU, UYVY, YUV9, YVU9, "
	"Y800, Y41P, Y41B, Y42B, IUY2 }")
	)
	);

	static const LCSFormat *
	colorspace_find_lcs_format (const GstCaps * caps)
	{
	const LCSFormat *format = NULL;
	const char *name;
	const GstStructure *structure = gst_caps_get_structure (caps, 0);

	name = gst_structure_get_name (structure);

	if (strcmp (name, "video/x-raw-rgb") == 0) {
	LCSRGBPackedFormat *rgb_fmt = g_new (LCSRGBPackedFormat, 1);
	gint mask;
	gchar *format_name;
	int endianness;

	format = (const LCSFormat *) rgb_fmt;

	((LCSFormat *) rgb_fmt)->type = LCS_FORMAT_RGB_PACKED;
	gst_structure_get_int (structure, "bpp",
	&((LCSFormat *) rgb_fmt)->bits_per_pixel);
	gst_structure_get_int (structure, "red_mask", &mask);
	lcs_utils_mask_to_shift (mask, &rgb_fmt->bits_per_component[LCS_R],
	&rgb_fmt->component_bit_offset[LCS_R]);
	gst_structure_get_int (structure, "green_mask", &mask);
	lcs_utils_mask_to_shift (mask, &rgb_fmt->bits_per_component[LCS_G],
	&rgb_fmt->component_bit_offset[LCS_G]);
	gst_structure_get_int (structure, "blue_mask", &mask);
	lcs_utils_mask_to_shift (mask, &rgb_fmt->bits_per_component[LCS_B],
	&rgb_fmt->component_bit_offset[LCS_B]);
	rgb_fmt->bits_per_component[LCS_A] = 0;
	rgb_fmt->component_bit_offset[LCS_A] = 0;
	gst_structure_get_int (structure, "endianness", &endianness);
	rgb_fmt->endianness = endianness;

	format_name = g_strdup_printf ("GST_RGB_%d", format->bits_per_pixel);
	lcs_register_format (format_name, (LCSFormat *) rgb_fmt, 1);
	} else if (strcmp (name, "video/x-raw-yuv") == 0) {
	guint32 space;
	gchar fourcc[5];

	gst_structure_get_fourcc (structure, "format", &space);
	lcs_utils_fourcc_to_string (space, fourcc);
	fourcc[4] = '\0';
	format = lcs_find_format (fourcc);
	} else {
	g_assert_not_reached ();
	}

	return format;
	}

	static guint32
	gst_colorspace_caps_get_fourcc (const GstCaps * caps)
	{
	guint32 format;
	GstStructure *structure;

	structure = gst_caps_get_structure (caps, 0);
	if (strcmp (gst_structure_get_name (structure), "video/x-raw-rgb") == 0) {
	format = GST_MAKE_FOURCC ('R', 'G', 'B', ' ');
	} else {
	gst_structure_get_fourcc (structure, "format", &format);
	}
	return format;
	}

	static gboolean
	colorspace_setup_converter (GstColorspace * space, const GstCaps * from_caps,
	const GstCaps * to_caps)
	{
	const LCSFormat *from_format = NULL;
	const LCSFormat *to_format = NULL;
	guint32 from_space, to_space;

	g_return_val_if_fail (to_caps != NULL, FALSE);
	g_return_val_if_fail (from_caps != NULL, FALSE);

	from_space = gst_colorspace_caps_get_fourcc (from_caps);
	to_space = gst_colorspace_caps_get_fourcc (to_caps);

	from_format = colorspace_find_lcs_format (from_caps);
	to_format = colorspace_find_lcs_format (to_caps);

	GST_DEBUG ("trying from " GST_FOURCC_FORMAT " to " GST_FOURCC_FORMAT,
	GST_FOURCC_ARGS (from_space), GST_FOURCC_ARGS (to_space));
	space->converter = lcs_find_converter (from_format, to_format, LCS_FLAG_FAST);

	if (space->converter) {
	GST_DEBUG ("trying from " GST_FOURCC_FORMAT " to " GST_FOURCC_FORMAT,
	GST_FOURCC_ARGS (from_space), GST_FOURCC_ARGS (to_space));
	space->disabled = FALSE;
	return TRUE;
	}

	return FALSE;
	}

	static GstCaps *
	gst_colorspace_getcaps (GstPad * pad)
	{
	#if unused
	GstColorspace *space;
	GstCaps *result;
	GstCaps *peercaps;
	GstCaps *ourcaps;

	space = GST_COLORSPACE (gst_pad_get_parent (pad));

	/* we can do everything our peer can... */
	peercaps = gst_caps_copy (gst_pad_get_allowed_caps (space->srcpad));
	/* and our own template of course */
	ourcaps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));

	/* merge them together, we prefer the peercaps first */
	result = gst_caps_prepend (ourcaps, peercaps);

	return result;
	#endif
	return gst_caps_copy (gst_pad_get_pad_template_caps (pad));
	}

	static GstPadLinkReturn
	gst_colorspace_link (GstPad * pad, const GstCaps * caps)
	{
	GstStructure *structure;
	GstPad *otherpad;
	GstCaps *othercaps;
	GstColorspace *space;
	int width;
	int height;
	double framerate;
	GstPadLinkReturn ret;

	space = GST_COLORSPACE (gst_pad_get_parent (pad));

	otherpad = (pad == space->srcpad) ? space->sinkpad : space->srcpad;

	structure = gst_caps_get_structure (caps, 0);

	gst_structure_get_int (structure, "width", &width);
	gst_structure_get_int (structure, "height", &height);
	gst_structure_get_double (structure, "framerate", &framerate);

	ret = gst_pad_try_set_caps (otherpad, caps);
	if (GST_PAD_LINK_SUCCESSFUL (ret)) {
	/* passthrough */
	space->passthrough = TRUE;
	return GST_PAD_LINK_OK;
	}
	space->passthrough = FALSE;

	if (gst_pad_is_negotiated (otherpad)) {
	othercaps = gst_caps_copy (gst_pad_get_negotiated_caps (otherpad));

	gst_caps_set_simple (othercaps,
	"width", G_TYPE_INT, width,
	"height", G_TYPE_INT, height,
	"framerate", G_TYPE_DOUBLE, framerate, NULL);

	ret = gst_pad_try_set_caps (otherpad, othercaps);
	if (!GST_PAD_LINK_SUCCESSFUL (ret)) {
	return ret;
	}

	if (colorspace_setup_converter (space, caps, othercaps)) {

	space->width = width;
	space->height = height;
	space->framerate = framerate;
	} else {
	return GST_PAD_LINK_REFUSED;
	}
	}

	return GST_PAD_LINK_OK;
	}

	static GType
	gst_colorspace_get_type (void)
	{
	static GType colorspace_type = 0;

	if (!colorspace_type) {
	static const GTypeInfo colorspace_info = {
	sizeof (GstColorspaceClass),
	(GBaseInitFunc) gst_colorspace_base_init,
	NULL,
	(GClassInitFunc) gst_colorspace_class_init,
	NULL,
	NULL,
	sizeof (GstColorspace),
	0,
	(GInstanceInitFunc) gst_colorspace_init,
	};

	colorspace_type =
	g_type_register_static (GST_TYPE_ELEMENT, "GstColorspaceLCS",
	&colorspace_info, 0);
	}
	return colorspace_type;
	}

	static void
	gst_colorspace_base_init (GstColorspaceClass * klass)
	{
	GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

	gst_element_class_add_pad_template (element_class,
	gst_static_pad_template_get (&gst_colorspace_src_template));
	gst_element_class_add_pad_template (element_class,
	gst_static_pad_template_get (&gst_colorspace_sink_template));
	gst_element_class_set_details (element_class, &colorspace_details);
	}

	static void
	gst_colorspace_class_init (GstColorspaceClass * 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_colorspace_set_property;
	gobject_class->get_property = gst_colorspace_get_property;

	gstelement_class->change_state = gst_colorspace_change_state;
	}

	static void
	gst_colorspace_init (GstColorspace * space)
	{
	space->sinkpad =
	gst_pad_new_from_template (gst_static_pad_template_get
	(&gst_colorspace_sink_template), "sink");
	gst_pad_set_link_function (space->sinkpad, gst_colorspace_link);
	gst_pad_set_getcaps_function (space->sinkpad, gst_colorspace_getcaps);
	gst_pad_set_chain_function (space->sinkpad, gst_colorspace_chain);
	gst_element_add_pad (GST_ELEMENT (space), space->sinkpad);

	space->srcpad =
	gst_pad_new_from_template (gst_static_pad_template_get
	(&gst_colorspace_src_template), "src");
	gst_element_add_pad (GST_ELEMENT (space), space->srcpad);
	gst_pad_set_link_function (space->srcpad, gst_colorspace_link);

	space->disabled = TRUE;
	}

	static void
	gst_colorspace_chain (GstPad * pad, GstData * _data)
	{
	GstBuffer *buf = GST_BUFFER (_data);
	GstColorspace *space;
	GstBuffer *outbuf;

	g_return_if_fail (pad != NULL);
	g_return_if_fail (GST_IS_PAD (pad));
	g_return_if_fail (buf != NULL);

	space = GST_COLORSPACE (gst_pad_get_parent (pad));

	g_return_if_fail (space != NULL);
	g_return_if_fail (GST_IS_COLORSPACE (space));

	if (space->passthrough) {
	outbuf = buf;
	} else {
	unsigned long size;

	lcs_format_buffer_size (lcs_converter_get_dest_format (space->converter),
	space->width, space->height, &size);

	outbuf = gst_pad_alloc_buffer (space->srcpad, GST_BUFFER_OFFSET_NONE, size);

	lcs_convert_auto (space->converter,
	GST_BUFFER_DATA (buf),
	GST_BUFFER_DATA (outbuf), space->width, space->height);

	GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buf);
	GST_BUFFER_DURATION (outbuf) = GST_BUFFER_DURATION (buf);

	gst_buffer_unref (buf);
	}
	gst_pad_push (space->srcpad, GST_DATA (outbuf));
	}

	static GstElementStateReturn
	gst_colorspace_change_state (GstElement * element)
	{
	GstColorspace *space;

	space = GST_COLORSPACE (element);

	switch (GST_STATE_TRANSITION (element)) {
	case GST_STATE_PAUSED_TO_READY:
	break;
	}

	parent_class->change_state (element);

	return GST_STATE_SUCCESS;
	}

	static void
	gst_colorspace_set_property (GObject * object, guint prop_id,
	const GValue * value, GParamSpec * pspec)
	{
	GstColorspace *space;

	g_return_if_fail (GST_IS_COLORSPACE (object));
	space = GST_COLORSPACE (object);

	switch (prop_id) {
	default:
	break;
	}
	}

	static void
	gst_colorspace_get_property (GObject * object, guint prop_id, GValue * value,
	GParamSpec * pspec)
	{
	GstColorspace *space;

	g_return_if_fail (GST_IS_COLORSPACE (object));
	space = GST_COLORSPACE (object);

	switch (prop_id) {
	default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
	break;
	}
	}

	static gboolean
	plugin_init (GstPlugin * plugin)
	{
	lcs_init (NULL, NULL);

	return gst_element_register (plugin, "lcscolorspace", GST_RANK_NONE,
	GST_TYPE_COLORSPACE);
	}


	GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
	GST_VERSION_MINOR,
	"colorspacelcs",
	"LCS colorspace convertor",
	plugin_init, VERSION, "LGPL", GST_PACKAGE, GST_ORIGIN)