sys/vdpau/gstvdpdecoder.c - imx-gst-plugins-bad - Git at Google

 /* GStreamer
 *
 * Copyright (C) 2009 Carl-Anton Ingmarsson <ca.ingmarsson@gmail.com>.
 *
 * 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., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif

 #include "gstvdpdecoder.h"
 #include "gstvdpvideomemory.h"
 #include "gstvdpvideobufferpool.h"

 GST_DEBUG_CATEGORY_STATIC (gst_vdp_decoder_debug);
 #define GST_CAT_DEFAULT gst_vdp_decoder_debug

 #define DEBUG_INIT \
     GST_DEBUG_CATEGORY_INIT (gst_vdp_decoder_debug, "vdpdecoder", 0, \
     "VDPAU decoder base class");
 #define gst_vdp_decoder_parent_class parent_class
 G_DEFINE_TYPE_WITH_CODE (GstVdpDecoder, gst_vdp_decoder, GST_TYPE_VIDEO_DECODER,
     DEBUG_INIT);

 enum
 {
   PROP_0,
   PROP_DISPLAY
 };

 void
 gst_vdp_decoder_post_error (GstVdpDecoder * decoder, GError * error)
 {
   GstMessage *message;

   g_return_if_fail (GST_IS_VDP_DECODER (decoder));
   g_return_if_fail (decoder != NULL);

   message = gst_message_new_error (GST_OBJECT (decoder), error, NULL);
   gst_element_post_message (GST_ELEMENT (decoder), message);
   g_error_free (error);
 }


 GstFlowReturn
 gst_vdp_decoder_render (GstVdpDecoder * vdp_decoder, VdpPictureInfo * info,
     guint n_bufs, VdpBitstreamBuffer * bufs, GstVideoCodecFrame * frame)
 {
   GstFlowReturn ret;

   VdpStatus status;

   GstVdpVideoMemory *vmem;
 #ifndef GST_DISABLE_GST_DEBUG
   GstClockTime before, after;
 #endif

   GST_DEBUG_OBJECT (vdp_decoder, "n_bufs:%d, frame:%d", n_bufs,
       frame->system_frame_number);

   ret =
       gst_video_decoder_allocate_output_frame (GST_VIDEO_DECODER (vdp_decoder),
       frame);
   if (ret != GST_FLOW_OK)
     goto fail_alloc;

   vmem = (GstVdpVideoMemory *) gst_buffer_get_memory (frame->output_buffer, 0);
   if (!vmem
       || !gst_memory_is_type ((GstMemory *) vmem,
           GST_VDP_VIDEO_MEMORY_ALLOCATOR))
     goto no_mem;

   GST_DEBUG_OBJECT (vdp_decoder, "Calling VdpDecoderRender()");
 #ifndef GST_DISABLE_GST_DEBUG
   before = gst_util_get_timestamp ();
 #endif
   status =
       vdp_decoder->device->vdp_decoder_render (vdp_decoder->decoder,
       vmem->surface, info, n_bufs, bufs);
 #ifndef GST_DISABLE_GST_DEBUG
   after = gst_util_get_timestamp ();
 #endif
   if (status != VDP_STATUS_OK)
     goto decode_error;

   GST_DEBUG_OBJECT (vdp_decoder, "VdpDecoderRender() took %" GST_TIME_FORMAT,
       GST_TIME_ARGS (after - before));

   return GST_FLOW_OK;

 decode_error:
   GST_ELEMENT_ERROR (vdp_decoder, RESOURCE, READ,
       ("Could not decode"),
       ("Error returned from vdpau was: %s",
           vdp_decoder->device->vdp_get_error_string (status)));

   gst_video_decoder_drop_frame (GST_VIDEO_DECODER (vdp_decoder), frame);

   return GST_FLOW_ERROR;

 fail_alloc:
   {
     GST_WARNING_OBJECT (vdp_decoder, "Failed to get an output frame");
     return ret;
   }

 no_mem:
   {
     GST_ERROR_OBJECT (vdp_decoder, "Didn't get VdpVideoSurface backed buffer");
     return GST_FLOW_ERROR;
   }
 }

 GstFlowReturn
 gst_vdp_decoder_init_decoder (GstVdpDecoder * vdp_decoder,
     VdpDecoderProfile profile, guint32 max_references,
     GstVideoCodecState * output_state)
 {
   GstVdpDevice *device;

   VdpStatus status;

   device = vdp_decoder->device;

   if (vdp_decoder->decoder != VDP_INVALID_HANDLE) {
     status = device->vdp_decoder_destroy (vdp_decoder->decoder);
     if (status != VDP_STATUS_OK)
       goto destroy_decoder_error;
   }

   GST_DEBUG_OBJECT (vdp_decoder,
       "device:%u, profile:%d, width:%d, height:%d, max_references:%d",
       device->device, profile, output_state->info.width,
       output_state->info.height, max_references);

   status = device->vdp_decoder_create (device->device, profile,
       output_state->info.width, output_state->info.height, max_references,
       &vdp_decoder->decoder);
   if (status != VDP_STATUS_OK)
     goto create_decoder_error;

   return GST_FLOW_OK;

 destroy_decoder_error:
   GST_ELEMENT_ERROR (vdp_decoder, RESOURCE, READ,
       ("Could not destroy vdpau decoder"),
       ("Error returned from vdpau was: %s",
           device->vdp_get_error_string (status)));

   return GST_FLOW_ERROR;

 create_decoder_error:
   GST_ELEMENT_ERROR (vdp_decoder, RESOURCE, READ,
       ("Could not create vdpau decoder"),
       ("Error returned from vdpau was: %s",
           device->vdp_get_error_string (status)));

   return GST_FLOW_ERROR;
 }

 static gboolean
 gst_vdp_decoder_decide_allocation (GstVideoDecoder * video_decoder,
     GstQuery * query)
 {
   GstVdpDecoder *vdp_decoder = GST_VDP_DECODER (video_decoder);
   GstCaps *outcaps;
   GstBufferPool *pool = NULL;
   guint size, min = 0, max = 0;
   GstStructure *config;
   GstVideoInfo vinfo;
   gboolean update_pool;

   gst_query_parse_allocation (query, &outcaps, NULL);
   gst_video_info_init (&vinfo);
   gst_video_info_from_caps (&vinfo, outcaps);

   if (gst_query_get_n_allocation_pools (query) > 0) {
     gst_query_parse_nth_allocation_pool (query, 0, &pool, &size, &min, &max);
     size = MAX (size, vinfo.size);
     update_pool = TRUE;
   } else {
     pool = NULL;
     size = vinfo.size;
     min = max = 0;

     update_pool = FALSE;
   }

   if (pool == NULL
       || !gst_buffer_pool_has_option (pool,
           GST_BUFFER_POOL_OPTION_VDP_VIDEO_META)) {
     if (pool)
       gst_object_unref (pool);
     /* no pool or pool doesn't support GstVdpVideoMeta, we can make our own */
     GST_DEBUG_OBJECT (video_decoder,
         "no pool or doesn't support GstVdpVideoMeta, making new pool");
     pool = gst_vdp_video_buffer_pool_new (vdp_decoder->device);
   }

   /* now configure */
   config = gst_buffer_pool_get_config (pool);
   gst_buffer_pool_config_set_params (config, outcaps, size, min, max);
   gst_buffer_pool_config_add_option (config,
       GST_BUFFER_POOL_OPTION_VDP_VIDEO_META);
   gst_buffer_pool_config_add_option (config, GST_BUFFER_POOL_OPTION_VIDEO_META);
   gst_buffer_pool_set_config (pool, config);

   if (update_pool)
     gst_query_set_nth_allocation_pool (query, 0, pool, size, min, max);
   else
     gst_query_add_allocation_pool (query, pool, size, min, max);

   if (pool)
     gst_object_unref (pool);

   return TRUE;

 }

 static gboolean
 gst_vdp_decoder_start (GstVideoDecoder * video_decoder)
 {
   GstVdpDecoder *vdp_decoder = GST_VDP_DECODER (video_decoder);
   GError *err = NULL;

   GST_DEBUG_OBJECT (video_decoder, "Starting");

   vdp_decoder->device = gst_vdp_get_device (vdp_decoder->display, &err);
   if (G_UNLIKELY (!vdp_decoder->device))
     goto device_error;

   vdp_decoder->decoder = VDP_INVALID_HANDLE;

   return TRUE;

 device_error:
   gst_vdp_decoder_post_error (vdp_decoder, err);
   return FALSE;
 }

 static gboolean
 gst_vdp_decoder_stop (GstVideoDecoder * video_decoder)
 {
   GstVdpDecoder *vdp_decoder = GST_VDP_DECODER (video_decoder);

   if (vdp_decoder->decoder != VDP_INVALID_HANDLE) {
     GstVdpDevice *device = vdp_decoder->device;
     VdpStatus status;

     status = device->vdp_decoder_destroy (vdp_decoder->decoder);
     if (status != VDP_STATUS_OK) {
       GST_ELEMENT_ERROR (vdp_decoder, RESOURCE, READ,
           ("Could not destroy vdpau decoder"),
           ("Error returned from vdpau was: %s",
               device->vdp_get_error_string (status)));
       return FALSE;
     }
   }

   g_object_unref (vdp_decoder->device);

   return TRUE;
 }

 static void
 gst_vdp_decoder_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec)
 {
   GstVdpDecoder *vdp_decoder = GST_VDP_DECODER (object);

   switch (prop_id) {
     case PROP_DISPLAY:
       g_value_set_string (value, vdp_decoder->display);
       break;

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

 static void
 gst_vdp_decoder_set_property (GObject * object, guint prop_id,
     const GValue * value, GParamSpec * pspec)
 {
   GstVdpDecoder *vdp_decoder = GST_VDP_DECODER (object);

   switch (prop_id) {
     case PROP_DISPLAY:
       g_free (vdp_decoder->display);
       vdp_decoder->display = g_value_dup_string (value);
       break;

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

 static void
 gst_vdp_decoder_finalize (GObject * object)
 {
   GstVdpDecoder *vdp_decoder = GST_VDP_DECODER (object);

   g_free (vdp_decoder->display);

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

 static void
 gst_vdp_decoder_init (GstVdpDecoder * vdp_decoder)
 {

 }

 static void
 gst_vdp_decoder_class_init (GstVdpDecoderClass * klass)
 {
   GObjectClass *object_class;
   GstVideoDecoderClass *video_decoder_class;
   GstElementClass *element_class;

   GstCaps *src_caps;
   GstPadTemplate *src_template;

   object_class = G_OBJECT_CLASS (klass);
   element_class = GST_ELEMENT_CLASS (klass);
   video_decoder_class = GST_VIDEO_DECODER_CLASS (klass);

   object_class->get_property = gst_vdp_decoder_get_property;
   object_class->set_property = gst_vdp_decoder_set_property;
   object_class->finalize = gst_vdp_decoder_finalize;

   video_decoder_class->start = gst_vdp_decoder_start;
   video_decoder_class->stop = gst_vdp_decoder_stop;
   video_decoder_class->decide_allocation = gst_vdp_decoder_decide_allocation;

   GST_FIXME ("Actually create srcpad template from hw capabilities");
   src_caps =
       gst_caps_from_string (GST_VIDEO_CAPS_MAKE_WITH_FEATURES
       (GST_CAPS_FEATURE_MEMORY_VDPAU,
           "{ YV12 }") ";" GST_VIDEO_CAPS_MAKE ("{ YV12 }"));
   src_template =
       gst_pad_template_new (GST_VIDEO_DECODER_SRC_NAME, GST_PAD_SRC,
       GST_PAD_ALWAYS, src_caps);

   gst_element_class_add_pad_template (element_class, src_template);

   if (src_caps)
     gst_caps_unref (src_caps);

   g_object_class_install_property (object_class,
       PROP_DISPLAY, g_param_spec_string ("display", "Display", "X Display name",
           NULL, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 }
	/* GStreamer
	*
	* Copyright (C) 2009 Carl-Anton Ingmarsson <ca.ingmarsson@gmail.com>.
	*
	* 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., 51 Franklin St, Fifth Floor,
	* Boston, MA 02110-1301, USA.
	*/

	#ifdef HAVE_CONFIG_H
	#include "config.h"
	#endif

	#include "gstvdpdecoder.h"
	#include "gstvdpvideomemory.h"
	#include "gstvdpvideobufferpool.h"

	GST_DEBUG_CATEGORY_STATIC (gst_vdp_decoder_debug);
	#define GST_CAT_DEFAULT gst_vdp_decoder_debug

	#define DEBUG_INIT \
	GST_DEBUG_CATEGORY_INIT (gst_vdp_decoder_debug, "vdpdecoder", 0, \
	"VDPAU decoder base class");
	#define gst_vdp_decoder_parent_class parent_class
	G_DEFINE_TYPE_WITH_CODE (GstVdpDecoder, gst_vdp_decoder, GST_TYPE_VIDEO_DECODER,
	DEBUG_INIT);

	enum
	{
	PROP_0,
	PROP_DISPLAY
	};

	void
	gst_vdp_decoder_post_error (GstVdpDecoder * decoder, GError * error)
	{
	GstMessage *message;

	g_return_if_fail (GST_IS_VDP_DECODER (decoder));
	g_return_if_fail (decoder != NULL);

	message = gst_message_new_error (GST_OBJECT (decoder), error, NULL);
	gst_element_post_message (GST_ELEMENT (decoder), message);
	g_error_free (error);
	}


	GstFlowReturn
	gst_vdp_decoder_render (GstVdpDecoder * vdp_decoder, VdpPictureInfo * info,
	guint n_bufs, VdpBitstreamBuffer * bufs, GstVideoCodecFrame * frame)
	{
	GstFlowReturn ret;

	VdpStatus status;

	GstVdpVideoMemory *vmem;
	#ifndef GST_DISABLE_GST_DEBUG
	GstClockTime before, after;
	#endif

	GST_DEBUG_OBJECT (vdp_decoder, "n_bufs:%d, frame:%d", n_bufs,
	frame->system_frame_number);

	ret =
	gst_video_decoder_allocate_output_frame (GST_VIDEO_DECODER (vdp_decoder),
	frame);
	if (ret != GST_FLOW_OK)
	goto fail_alloc;

	vmem = (GstVdpVideoMemory *) gst_buffer_get_memory (frame->output_buffer, 0);
	if (!vmem
	\|\| !gst_memory_is_type ((GstMemory *) vmem,
	GST_VDP_VIDEO_MEMORY_ALLOCATOR))
	goto no_mem;

	GST_DEBUG_OBJECT (vdp_decoder, "Calling VdpDecoderRender()");
	#ifndef GST_DISABLE_GST_DEBUG
	before = gst_util_get_timestamp ();
	#endif
	status =
	vdp_decoder->device->vdp_decoder_render (vdp_decoder->decoder,
	vmem->surface, info, n_bufs, bufs);
	#ifndef GST_DISABLE_GST_DEBUG
	after = gst_util_get_timestamp ();
	#endif
	if (status != VDP_STATUS_OK)
	goto decode_error;

	GST_DEBUG_OBJECT (vdp_decoder, "VdpDecoderRender() took %" GST_TIME_FORMAT,
	GST_TIME_ARGS (after - before));

	return GST_FLOW_OK;

	decode_error:
	GST_ELEMENT_ERROR (vdp_decoder, RESOURCE, READ,
	("Could not decode"),
	("Error returned from vdpau was: %s",
	vdp_decoder->device->vdp_get_error_string (status)));

	gst_video_decoder_drop_frame (GST_VIDEO_DECODER (vdp_decoder), frame);

	return GST_FLOW_ERROR;

	fail_alloc:
	{
	GST_WARNING_OBJECT (vdp_decoder, "Failed to get an output frame");
	return ret;
	}

	no_mem:
	{
	GST_ERROR_OBJECT (vdp_decoder, "Didn't get VdpVideoSurface backed buffer");
	return GST_FLOW_ERROR;
	}
	}

	GstFlowReturn
	gst_vdp_decoder_init_decoder (GstVdpDecoder * vdp_decoder,
	VdpDecoderProfile profile, guint32 max_references,
	GstVideoCodecState * output_state)
	{
	GstVdpDevice *device;

	VdpStatus status;

	device = vdp_decoder->device;

	if (vdp_decoder->decoder != VDP_INVALID_HANDLE) {
	status = device->vdp_decoder_destroy (vdp_decoder->decoder);
	if (status != VDP_STATUS_OK)
	goto destroy_decoder_error;
	}

	GST_DEBUG_OBJECT (vdp_decoder,
	"device:%u, profile:%d, width:%d, height:%d, max_references:%d",
	device->device, profile, output_state->info.width,
	output_state->info.height, max_references);

	status = device->vdp_decoder_create (device->device, profile,
	output_state->info.width, output_state->info.height, max_references,
	&vdp_decoder->decoder);
	if (status != VDP_STATUS_OK)
	goto create_decoder_error;

	return GST_FLOW_OK;

	destroy_decoder_error:
	GST_ELEMENT_ERROR (vdp_decoder, RESOURCE, READ,
	("Could not destroy vdpau decoder"),
	("Error returned from vdpau was: %s",
	device->vdp_get_error_string (status)));

	return GST_FLOW_ERROR;

	create_decoder_error:
	GST_ELEMENT_ERROR (vdp_decoder, RESOURCE, READ,
	("Could not create vdpau decoder"),
	("Error returned from vdpau was: %s",
	device->vdp_get_error_string (status)));

	return GST_FLOW_ERROR;
	}

	static gboolean
	gst_vdp_decoder_decide_allocation (GstVideoDecoder * video_decoder,
	GstQuery * query)
	{
	GstVdpDecoder *vdp_decoder = GST_VDP_DECODER (video_decoder);
	GstCaps *outcaps;
	GstBufferPool *pool = NULL;
	guint size, min = 0, max = 0;
	GstStructure *config;
	GstVideoInfo vinfo;
	gboolean update_pool;

	gst_query_parse_allocation (query, &outcaps, NULL);
	gst_video_info_init (&vinfo);
	gst_video_info_from_caps (&vinfo, outcaps);

	if (gst_query_get_n_allocation_pools (query) > 0) {
	gst_query_parse_nth_allocation_pool (query, 0, &pool, &size, &min, &max);
	size = MAX (size, vinfo.size);
	update_pool = TRUE;
	} else {
	pool = NULL;
	size = vinfo.size;
	min = max = 0;

	update_pool = FALSE;
	}

	if (pool == NULL
	\|\| !gst_buffer_pool_has_option (pool,
	GST_BUFFER_POOL_OPTION_VDP_VIDEO_META)) {
	if (pool)
	gst_object_unref (pool);
	/* no pool or pool doesn't support GstVdpVideoMeta, we can make our own */
	GST_DEBUG_OBJECT (video_decoder,
	"no pool or doesn't support GstVdpVideoMeta, making new pool");
	pool = gst_vdp_video_buffer_pool_new (vdp_decoder->device);
	}

	/* now configure */
	config = gst_buffer_pool_get_config (pool);
	gst_buffer_pool_config_set_params (config, outcaps, size, min, max);
	gst_buffer_pool_config_add_option (config,
	GST_BUFFER_POOL_OPTION_VDP_VIDEO_META);
	gst_buffer_pool_config_add_option (config, GST_BUFFER_POOL_OPTION_VIDEO_META);
	gst_buffer_pool_set_config (pool, config);

	if (update_pool)
	gst_query_set_nth_allocation_pool (query, 0, pool, size, min, max);
	else
	gst_query_add_allocation_pool (query, pool, size, min, max);

	if (pool)
	gst_object_unref (pool);

	return TRUE;

	}

	static gboolean
	gst_vdp_decoder_start (GstVideoDecoder * video_decoder)
	{
	GstVdpDecoder *vdp_decoder = GST_VDP_DECODER (video_decoder);
	GError *err = NULL;

	GST_DEBUG_OBJECT (video_decoder, "Starting");

	vdp_decoder->device = gst_vdp_get_device (vdp_decoder->display, &err);
	if (G_UNLIKELY (!vdp_decoder->device))
	goto device_error;

	vdp_decoder->decoder = VDP_INVALID_HANDLE;

	return TRUE;

	device_error:
	gst_vdp_decoder_post_error (vdp_decoder, err);
	return FALSE;
	}

	static gboolean
	gst_vdp_decoder_stop (GstVideoDecoder * video_decoder)
	{
	GstVdpDecoder *vdp_decoder = GST_VDP_DECODER (video_decoder);

	if (vdp_decoder->decoder != VDP_INVALID_HANDLE) {
	GstVdpDevice *device = vdp_decoder->device;
	VdpStatus status;

	status = device->vdp_decoder_destroy (vdp_decoder->decoder);
	if (status != VDP_STATUS_OK) {
	GST_ELEMENT_ERROR (vdp_decoder, RESOURCE, READ,
	("Could not destroy vdpau decoder"),
	("Error returned from vdpau was: %s",
	device->vdp_get_error_string (status)));
	return FALSE;
	}
	}

	g_object_unref (vdp_decoder->device);

	return TRUE;
	}

	static void
	gst_vdp_decoder_get_property (GObject * object, guint prop_id,
	GValue * value, GParamSpec * pspec)
	{
	GstVdpDecoder *vdp_decoder = GST_VDP_DECODER (object);

	switch (prop_id) {
	case PROP_DISPLAY:
	g_value_set_string (value, vdp_decoder->display);
	break;

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

	static void
	gst_vdp_decoder_set_property (GObject * object, guint prop_id,
	const GValue * value, GParamSpec * pspec)
	{
	GstVdpDecoder *vdp_decoder = GST_VDP_DECODER (object);

	switch (prop_id) {
	case PROP_DISPLAY:
	g_free (vdp_decoder->display);
	vdp_decoder->display = g_value_dup_string (value);
	break;

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

	static void
	gst_vdp_decoder_finalize (GObject * object)
	{
	GstVdpDecoder *vdp_decoder = GST_VDP_DECODER (object);

	g_free (vdp_decoder->display);

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

	static void
	gst_vdp_decoder_init (GstVdpDecoder * vdp_decoder)
	{

	}

	static void
	gst_vdp_decoder_class_init (GstVdpDecoderClass * klass)
	{
	GObjectClass *object_class;
	GstVideoDecoderClass *video_decoder_class;
	GstElementClass *element_class;

	GstCaps *src_caps;
	GstPadTemplate *src_template;

	object_class = G_OBJECT_CLASS (klass);
	element_class = GST_ELEMENT_CLASS (klass);
	video_decoder_class = GST_VIDEO_DECODER_CLASS (klass);

	object_class->get_property = gst_vdp_decoder_get_property;
	object_class->set_property = gst_vdp_decoder_set_property;
	object_class->finalize = gst_vdp_decoder_finalize;

	video_decoder_class->start = gst_vdp_decoder_start;
	video_decoder_class->stop = gst_vdp_decoder_stop;
	video_decoder_class->decide_allocation = gst_vdp_decoder_decide_allocation;

	GST_FIXME ("Actually create srcpad template from hw capabilities");
	src_caps =
	gst_caps_from_string (GST_VIDEO_CAPS_MAKE_WITH_FEATURES
	(GST_CAPS_FEATURE_MEMORY_VDPAU,
	"{ YV12 }") ";" GST_VIDEO_CAPS_MAKE ("{ YV12 }"));
	src_template =
	gst_pad_template_new (GST_VIDEO_DECODER_SRC_NAME, GST_PAD_SRC,
	GST_PAD_ALWAYS, src_caps);

	gst_element_class_add_pad_template (element_class, src_template);

	if (src_caps)
	gst_caps_unref (src_caps);

	g_object_class_install_property (object_class,
	PROP_DISPLAY, g_param_spec_string ("display", "Display", "X Display name",
	NULL, G_PARAM_READWRITE \| G_PARAM_CONSTRUCT));
	}