gst/inter/gstintervideosrc.c - mtk-gst-plugins-bad-debian - Git at Google

 /* GStreamer
  * Copyright (C) 2011 David A. Schleef <ds@schleef.org>
  *
  * 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 Street, Suite 500,
  * Boston, MA 02110-1335, USA.
  */
 /**
  * SECTION:element-gstintervideosrc
  *
  * The intervideosrc element is a video source element.  It is used
  * in connection with a intervideosink element in a different pipeline,
  * similar to interaudiosink and interaudiosrc.
  *
  * <refsect2>
  * <title>Example launch line</title>
  * |[
  * gst-launch -v intervideosrc ! queue ! xvimagesink
  * ]|
  *
  * The intersubsrc element cannot be used effectively with gst-launch,
  * as it requires a second pipeline in the application to send subtitles.
  * </refsect2>
  */

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

 #include <gst/gst.h>
 #include <gst/base/gstbasesrc.h>
 #include <gst/video/video.h>
 #include "gstintervideosrc.h"
 #include <string.h>

 GST_DEBUG_CATEGORY_STATIC (gst_inter_video_src_debug_category);
 #define GST_CAT_DEFAULT gst_inter_video_src_debug_category

 /* prototypes */


 static void gst_inter_video_src_set_property (GObject * object,
     guint property_id, const GValue * value, GParamSpec * pspec);
 static void gst_inter_video_src_get_property (GObject * object,
     guint property_id, GValue * value, GParamSpec * pspec);
 static void gst_inter_video_src_finalize (GObject * object);

 static gboolean gst_inter_video_src_set_caps (GstBaseSrc * src, GstCaps * caps);
 static gboolean gst_inter_video_src_start (GstBaseSrc * src);
 static gboolean gst_inter_video_src_stop (GstBaseSrc * src);
 static void
 gst_inter_video_src_get_times (GstBaseSrc * src, GstBuffer * buffer,
     GstClockTime * start, GstClockTime * end);
 static GstFlowReturn
 gst_inter_video_src_create (GstBaseSrc * src, guint64 offset, guint size,
     GstBuffer ** buf);
 static GstCaps *gst_inter_video_src_fixate (GstBaseSrc * src, GstCaps * caps);

 enum
 {
   PROP_0,
   PROP_CHANNEL
 };

 /* pad templates */

 static GstStaticPadTemplate gst_inter_video_src_src_template =
 GST_STATIC_PAD_TEMPLATE ("src",
     GST_PAD_SRC,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("I420"))
     );


 /* class initialization */

 G_DEFINE_TYPE (GstInterVideoSrc, gst_inter_video_src, GST_TYPE_BASE_SRC);

 static void
 gst_inter_video_src_class_init (GstInterVideoSrcClass * klass)
 {
   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
   GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
   GstBaseSrcClass *base_src_class = GST_BASE_SRC_CLASS (klass);

   GST_DEBUG_CATEGORY_INIT (gst_inter_video_src_debug_category, "intervideosrc",
       0, "debug category for intervideosrc element");

   gst_element_class_add_pad_template (element_class,
       gst_static_pad_template_get (&gst_inter_video_src_src_template));

   gst_element_class_set_static_metadata (element_class,
       "Internal video source",
       "Source/Video",
       "Virtual video source for internal process communication",
       "David Schleef <ds@schleef.org>");

   gobject_class->set_property = gst_inter_video_src_set_property;
   gobject_class->get_property = gst_inter_video_src_get_property;
   gobject_class->finalize = gst_inter_video_src_finalize;
   base_src_class->set_caps = GST_DEBUG_FUNCPTR (gst_inter_video_src_set_caps);
   base_src_class->start = GST_DEBUG_FUNCPTR (gst_inter_video_src_start);
   base_src_class->stop = GST_DEBUG_FUNCPTR (gst_inter_video_src_stop);
   base_src_class->get_times = GST_DEBUG_FUNCPTR (gst_inter_video_src_get_times);
   base_src_class->create = GST_DEBUG_FUNCPTR (gst_inter_video_src_create);
   base_src_class->fixate = GST_DEBUG_FUNCPTR (gst_inter_video_src_fixate);

   g_object_class_install_property (gobject_class, PROP_CHANNEL,
       g_param_spec_string ("channel", "Channel",
           "Channel name to match inter src and sink elements",
           "default", G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

 }

 static void
 gst_inter_video_src_init (GstInterVideoSrc * intervideosrc)
 {
   gst_base_src_set_format (GST_BASE_SRC (intervideosrc), GST_FORMAT_TIME);
   gst_base_src_set_live (GST_BASE_SRC (intervideosrc), TRUE);

   intervideosrc->channel = g_strdup ("default");
 }

 void
 gst_inter_video_src_set_property (GObject * object, guint property_id,
     const GValue * value, GParamSpec * pspec)
 {
   GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (object);

   switch (property_id) {
     case PROP_CHANNEL:
       g_free (intervideosrc->channel);
       intervideosrc->channel = g_value_dup_string (value);
       break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
       break;
   }
 }

 void
 gst_inter_video_src_get_property (GObject * object, guint property_id,
     GValue * value, GParamSpec * pspec)
 {
   GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (object);

   switch (property_id) {
     case PROP_CHANNEL:
       g_value_set_string (value, intervideosrc->channel);
       break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
       break;
   }
 }

 void
 gst_inter_video_src_finalize (GObject * object)
 {
   GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (object);

   /* clean up object here */
   g_free (intervideosrc->channel);

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


 static gboolean
 gst_inter_video_src_set_caps (GstBaseSrc * src, GstCaps * caps)
 {
   GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (src);

   GST_DEBUG_OBJECT (intervideosrc, "set_caps");

   if (!gst_video_info_from_caps (&intervideosrc->info, caps))
     return FALSE;

   return gst_pad_set_caps (src->srcpad, caps);
 }


 static gboolean
 gst_inter_video_src_start (GstBaseSrc * src)
 {
   GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (src);

   GST_DEBUG_OBJECT (intervideosrc, "start");

   intervideosrc->surface = gst_inter_surface_get (intervideosrc->channel);

   return TRUE;
 }

 static gboolean
 gst_inter_video_src_stop (GstBaseSrc * src)
 {
   GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (src);

   GST_DEBUG_OBJECT (intervideosrc, "stop");

   gst_inter_surface_unref (intervideosrc->surface);
   intervideosrc->surface = NULL;

   return TRUE;
 }

 static void
 gst_inter_video_src_get_times (GstBaseSrc * src, GstBuffer * buffer,
     GstClockTime * start, GstClockTime * end)
 {
   GST_DEBUG_OBJECT (src, "get_times");

   /* for live sources, sync on the timestamp of the buffer */
   if (gst_base_src_is_live (src)) {
     GstClockTime timestamp = GST_BUFFER_PTS (buffer);

     if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
       /* get duration to calculate end time */
       GstClockTime duration = GST_BUFFER_DURATION (buffer);

       if (GST_CLOCK_TIME_IS_VALID (duration)) {
         *end = timestamp + duration;
       }
       *start = timestamp;
     }
   } else {
     *start = -1;
     *end = -1;
   }
 }


 static GstFlowReturn
 gst_inter_video_src_create (GstBaseSrc * src, guint64 offset, guint size,
     GstBuffer ** buf)
 {
   GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (src);
   GstBuffer *buffer;

   GST_DEBUG_OBJECT (intervideosrc, "create");

   buffer = NULL;

   g_mutex_lock (&intervideosrc->surface->mutex);
   if (intervideosrc->surface->video_buffer) {
     buffer = gst_buffer_ref (intervideosrc->surface->video_buffer);
     intervideosrc->surface->video_buffer_count++;
     if (intervideosrc->surface->video_buffer_count >= 30) {
       gst_buffer_unref (intervideosrc->surface->video_buffer);
       intervideosrc->surface->video_buffer = NULL;
     }
   }
   g_mutex_unlock (&intervideosrc->surface->mutex);

   if (buffer == NULL) {
     GstMapInfo map;

     buffer =
         gst_buffer_new_and_alloc (GST_VIDEO_INFO_SIZE (&intervideosrc->info));

     gst_buffer_map (buffer, &map, GST_MAP_WRITE);
     memset (map.data, 16, GST_VIDEO_INFO_COMP_STRIDE (&intervideosrc->info, 0) *
         GST_VIDEO_INFO_COMP_HEIGHT (&intervideosrc->info, 0));

     memset (map.data + GST_VIDEO_INFO_COMP_OFFSET (&intervideosrc->info, 1),
         128,
         2 * GST_VIDEO_INFO_COMP_STRIDE (&intervideosrc->info, 1) *
         GST_VIDEO_INFO_COMP_HEIGHT (&intervideosrc->info, 1));
     gst_buffer_unmap (buffer, &map);
   }

   buffer = gst_buffer_make_writable (buffer);

   GST_BUFFER_PTS (buffer) =
       gst_util_uint64_scale_int (GST_SECOND * intervideosrc->n_frames,
       GST_VIDEO_INFO_FPS_D (&intervideosrc->info),
       GST_VIDEO_INFO_FPS_N (&intervideosrc->info));
   GST_BUFFER_DTS (buffer) = GST_CLOCK_TIME_NONE;
   GST_DEBUG_OBJECT (intervideosrc, "create ts %" GST_TIME_FORMAT,
       GST_TIME_ARGS (GST_BUFFER_PTS (buffer)));
   GST_BUFFER_DURATION (buffer) =
       gst_util_uint64_scale_int (GST_SECOND * (intervideosrc->n_frames + 1),
       GST_VIDEO_INFO_FPS_D (&intervideosrc->info),
       GST_VIDEO_INFO_FPS_N (&intervideosrc->info)) - GST_BUFFER_PTS (buffer);
   GST_BUFFER_OFFSET (buffer) = intervideosrc->n_frames;
   GST_BUFFER_OFFSET_END (buffer) = -1;
   GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DISCONT);
   if (intervideosrc->n_frames == 0) {
     GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
   }
   intervideosrc->n_frames++;

   *buf = buffer;

   return GST_FLOW_OK;
 }

 static GstCaps *
 gst_inter_video_src_fixate (GstBaseSrc * src, GstCaps * caps)
 {
   GstStructure *structure;

   GST_DEBUG_OBJECT (src, "fixate");

   caps = gst_caps_make_writable (caps);

   structure = gst_caps_get_structure (caps, 0);

   gst_structure_fixate_field_nearest_int (structure, "width", 320);
   gst_structure_fixate_field_nearest_int (structure, "height", 240);
   gst_structure_fixate_field_nearest_fraction (structure, "framerate", 30, 1);
   if (gst_structure_has_field (structure, "pixel-aspect-ratio"))
     gst_structure_fixate_field_nearest_fraction (structure,
         "pixel-aspect-ratio", 1, 1);
   if (gst_structure_has_field (structure, "color-matrix"))
     gst_structure_fixate_field_string (structure, "color-matrix", "sdtv");
   if (gst_structure_has_field (structure, "chroma-site"))
     gst_structure_fixate_field_string (structure, "chroma-site", "mpeg2");

   if (gst_structure_has_field (structure, "interlaced"))
     gst_structure_fixate_field_boolean (structure, "interlaced", FALSE);

   return caps;
 }
	/* GStreamer
	* Copyright (C) 2011 David A. Schleef <ds@schleef.org>
	*
	* 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 Street, Suite 500,
	* Boston, MA 02110-1335, USA.
	*/
	/**
	* SECTION:element-gstintervideosrc
	*
	* The intervideosrc element is a video source element. It is used
	* in connection with a intervideosink element in a different pipeline,
	* similar to interaudiosink and interaudiosrc.
	*
	* <refsect2>
	* <title>Example launch line</title>
	* \|[
	* gst-launch -v intervideosrc ! queue ! xvimagesink
	* ]\|
	*
	* The intersubsrc element cannot be used effectively with gst-launch,
	* as it requires a second pipeline in the application to send subtitles.
	* </refsect2>
	*/

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

	#include <gst/gst.h>
	#include <gst/base/gstbasesrc.h>
	#include <gst/video/video.h>
	#include "gstintervideosrc.h"
	#include <string.h>

	GST_DEBUG_CATEGORY_STATIC (gst_inter_video_src_debug_category);
	#define GST_CAT_DEFAULT gst_inter_video_src_debug_category

	/* prototypes */


	static void gst_inter_video_src_set_property (GObject * object,
	guint property_id, const GValue * value, GParamSpec * pspec);
	static void gst_inter_video_src_get_property (GObject * object,
	guint property_id, GValue * value, GParamSpec * pspec);
	static void gst_inter_video_src_finalize (GObject * object);

	static gboolean gst_inter_video_src_set_caps (GstBaseSrc * src, GstCaps * caps);
	static gboolean gst_inter_video_src_start (GstBaseSrc * src);
	static gboolean gst_inter_video_src_stop (GstBaseSrc * src);
	static void
	gst_inter_video_src_get_times (GstBaseSrc * src, GstBuffer * buffer,
	GstClockTime * start, GstClockTime * end);
	static GstFlowReturn
	gst_inter_video_src_create (GstBaseSrc * src, guint64 offset, guint size,
	GstBuffer ** buf);
	static GstCaps gst_inter_video_src_fixate (GstBaseSrc src, GstCaps * caps);

	enum
	{
	PROP_0,
	PROP_CHANNEL
	};

	/* pad templates */

	static GstStaticPadTemplate gst_inter_video_src_src_template =
	GST_STATIC_PAD_TEMPLATE ("src",
	GST_PAD_SRC,
	GST_PAD_ALWAYS,
	GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("I420"))
	);


	/* class initialization */

	G_DEFINE_TYPE (GstInterVideoSrc, gst_inter_video_src, GST_TYPE_BASE_SRC);

	static void
	gst_inter_video_src_class_init (GstInterVideoSrcClass * klass)
	{
	GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
	GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
	GstBaseSrcClass *base_src_class = GST_BASE_SRC_CLASS (klass);

	GST_DEBUG_CATEGORY_INIT (gst_inter_video_src_debug_category, "intervideosrc",
	0, "debug category for intervideosrc element");

	gst_element_class_add_pad_template (element_class,
	gst_static_pad_template_get (&gst_inter_video_src_src_template));

	gst_element_class_set_static_metadata (element_class,
	"Internal video source",
	"Source/Video",
	"Virtual video source for internal process communication",
	"David Schleef <ds@schleef.org>");

	gobject_class->set_property = gst_inter_video_src_set_property;
	gobject_class->get_property = gst_inter_video_src_get_property;
	gobject_class->finalize = gst_inter_video_src_finalize;
	base_src_class->set_caps = GST_DEBUG_FUNCPTR (gst_inter_video_src_set_caps);
	base_src_class->start = GST_DEBUG_FUNCPTR (gst_inter_video_src_start);
	base_src_class->stop = GST_DEBUG_FUNCPTR (gst_inter_video_src_stop);
	base_src_class->get_times = GST_DEBUG_FUNCPTR (gst_inter_video_src_get_times);
	base_src_class->create = GST_DEBUG_FUNCPTR (gst_inter_video_src_create);
	base_src_class->fixate = GST_DEBUG_FUNCPTR (gst_inter_video_src_fixate);

	g_object_class_install_property (gobject_class, PROP_CHANNEL,
	g_param_spec_string ("channel", "Channel",
	"Channel name to match inter src and sink elements",
	"default", G_PARAM_READWRITE \| G_PARAM_STATIC_STRINGS));

	}

	static void
	gst_inter_video_src_init (GstInterVideoSrc * intervideosrc)
	{
	gst_base_src_set_format (GST_BASE_SRC (intervideosrc), GST_FORMAT_TIME);
	gst_base_src_set_live (GST_BASE_SRC (intervideosrc), TRUE);

	intervideosrc->channel = g_strdup ("default");
	}

	void
	gst_inter_video_src_set_property (GObject * object, guint property_id,
	const GValue * value, GParamSpec * pspec)
	{
	GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (object);

	switch (property_id) {
	case PROP_CHANNEL:
	g_free (intervideosrc->channel);
	intervideosrc->channel = g_value_dup_string (value);
	break;
	default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
	break;
	}
	}

	void
	gst_inter_video_src_get_property (GObject * object, guint property_id,
	GValue * value, GParamSpec * pspec)
	{
	GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (object);

	switch (property_id) {
	case PROP_CHANNEL:
	g_value_set_string (value, intervideosrc->channel);
	break;
	default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
	break;
	}
	}

	void
	gst_inter_video_src_finalize (GObject * object)
	{
	GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (object);

	/* clean up object here */
	g_free (intervideosrc->channel);

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



	static gboolean
	gst_inter_video_src_set_caps (GstBaseSrc * src, GstCaps * caps)
	{
	GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (src);

	GST_DEBUG_OBJECT (intervideosrc, "set_caps");

	if (!gst_video_info_from_caps (&intervideosrc->info, caps))
	return FALSE;

	return gst_pad_set_caps (src->srcpad, caps);
	}


	static gboolean
	gst_inter_video_src_start (GstBaseSrc * src)
	{
	GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (src);

	GST_DEBUG_OBJECT (intervideosrc, "start");

	intervideosrc->surface = gst_inter_surface_get (intervideosrc->channel);

	return TRUE;
	}

	static gboolean
	gst_inter_video_src_stop (GstBaseSrc * src)
	{
	GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (src);

	GST_DEBUG_OBJECT (intervideosrc, "stop");

	gst_inter_surface_unref (intervideosrc->surface);
	intervideosrc->surface = NULL;

	return TRUE;
	}

	static void
	gst_inter_video_src_get_times (GstBaseSrc * src, GstBuffer * buffer,
	GstClockTime * start, GstClockTime * end)
	{
	GST_DEBUG_OBJECT (src, "get_times");

	/* for live sources, sync on the timestamp of the buffer */
	if (gst_base_src_is_live (src)) {
	GstClockTime timestamp = GST_BUFFER_PTS (buffer);

	if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
	/* get duration to calculate end time */
	GstClockTime duration = GST_BUFFER_DURATION (buffer);

	if (GST_CLOCK_TIME_IS_VALID (duration)) {
	*end = timestamp + duration;
	}
	*start = timestamp;
	}
	} else {
	*start = -1;
	*end = -1;
	}
	}


	static GstFlowReturn
	gst_inter_video_src_create (GstBaseSrc * src, guint64 offset, guint size,
	GstBuffer ** buf)
	{
	GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (src);
	GstBuffer *buffer;

	GST_DEBUG_OBJECT (intervideosrc, "create");

	buffer = NULL;

	g_mutex_lock (&intervideosrc->surface->mutex);
	if (intervideosrc->surface->video_buffer) {
	buffer = gst_buffer_ref (intervideosrc->surface->video_buffer);
	intervideosrc->surface->video_buffer_count++;
	if (intervideosrc->surface->video_buffer_count >= 30) {
	gst_buffer_unref (intervideosrc->surface->video_buffer);
	intervideosrc->surface->video_buffer = NULL;
	}
	}
	g_mutex_unlock (&intervideosrc->surface->mutex);

	if (buffer == NULL) {
	GstMapInfo map;

	buffer =
	gst_buffer_new_and_alloc (GST_VIDEO_INFO_SIZE (&intervideosrc->info));

	gst_buffer_map (buffer, &map, GST_MAP_WRITE);
	memset (map.data, 16, GST_VIDEO_INFO_COMP_STRIDE (&intervideosrc->info, 0) *
	GST_VIDEO_INFO_COMP_HEIGHT (&intervideosrc->info, 0));

	memset (map.data + GST_VIDEO_INFO_COMP_OFFSET (&intervideosrc->info, 1),
	128,
	2 * GST_VIDEO_INFO_COMP_STRIDE (&intervideosrc->info, 1) *
	GST_VIDEO_INFO_COMP_HEIGHT (&intervideosrc->info, 1));
	gst_buffer_unmap (buffer, &map);
	}

	buffer = gst_buffer_make_writable (buffer);

	GST_BUFFER_PTS (buffer) =
	gst_util_uint64_scale_int (GST_SECOND * intervideosrc->n_frames,
	GST_VIDEO_INFO_FPS_D (&intervideosrc->info),
	GST_VIDEO_INFO_FPS_N (&intervideosrc->info));
	GST_BUFFER_DTS (buffer) = GST_CLOCK_TIME_NONE;
	GST_DEBUG_OBJECT (intervideosrc, "create ts %" GST_TIME_FORMAT,
	GST_TIME_ARGS (GST_BUFFER_PTS (buffer)));
	GST_BUFFER_DURATION (buffer) =
	gst_util_uint64_scale_int (GST_SECOND * (intervideosrc->n_frames + 1),
	GST_VIDEO_INFO_FPS_D (&intervideosrc->info),
	GST_VIDEO_INFO_FPS_N (&intervideosrc->info)) - GST_BUFFER_PTS (buffer);
	GST_BUFFER_OFFSET (buffer) = intervideosrc->n_frames;
	GST_BUFFER_OFFSET_END (buffer) = -1;
	GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DISCONT);
	if (intervideosrc->n_frames == 0) {
	GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
	}
	intervideosrc->n_frames++;

	*buf = buffer;

	return GST_FLOW_OK;
	}

	static GstCaps *
	gst_inter_video_src_fixate (GstBaseSrc * src, GstCaps * caps)
	{
	GstStructure *structure;

	GST_DEBUG_OBJECT (src, "fixate");

	caps = gst_caps_make_writable (caps);

	structure = gst_caps_get_structure (caps, 0);

	gst_structure_fixate_field_nearest_int (structure, "width", 320);
	gst_structure_fixate_field_nearest_int (structure, "height", 240);
	gst_structure_fixate_field_nearest_fraction (structure, "framerate", 30, 1);
	if (gst_structure_has_field (structure, "pixel-aspect-ratio"))
	gst_structure_fixate_field_nearest_fraction (structure,
	"pixel-aspect-ratio", 1, 1);
	if (gst_structure_has_field (structure, "color-matrix"))
	gst_structure_fixate_field_string (structure, "color-matrix", "sdtv");
	if (gst_structure_has_field (structure, "chroma-site"))
	gst_structure_fixate_field_string (structure, "chroma-site", "mpeg2");

	if (gst_structure_has_field (structure, "interlaced"))
	gst_structure_fixate_field_boolean (structure, "interlaced", FALSE);

	return caps;
	}