/*

 *  GStreamer Video sink.

 *

 *  Copyright (C) <2003> Julien Moutte <julien@moutte.net>

 *

 * 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:gstvideosink

 * @short_description: Base class for video sinks

 * 

 * <refsect2>

 * <para>

 * Provides useful functions and a base class for video sinks. 

 * </para>

 * <para>

 * GstVideoSink will configure the default base sink to drop frames that

 * arrive later than 20ms as this is considered the default threshold for

 * observing out-of-sync frames.

 * </para>

 * </refsect2>

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include "gstvideosink.h"

GST_DEBUG_CATEGORY_STATIC (video_sink_debug);

#define GST_CAT_DEFAULT video_sink_debug

static GstElementClass *parent_class = NULL;

/**

 * gst_video_sink_center_rect:

 * @src: the #GstVideoRectangle describing the source area

 * @dst: the #GstVideoRectangle describing the destination area

 * @result: a pointer to a #GstVideoRectangle which will receive the result area

 * @scaling: a #gboolean indicating if scaling should be applied or not

 * 

 * Takes @src rectangle and position it at the center of @dst rectangle with or

 * without @scaling. It handles clipping if the @src rectangle is bigger than

 * the @dst one and @scaling is set to FALSE.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

void

gst_video_sink_center_rect (GstVideoRectangle src, GstVideoRectangle dst,

    GstVideoRectangle * result, gboolean scaling)

{

  g_return_if_fail (result != NULL);

  if (!scaling) {

    result->w = MIN (src.w, dst.w);

    result->h = MIN (src.h, dst.h);

    result->x = (dst.w - result->w) / 2;

    result->y = (dst.h - result->h) / 2;

  } else {

    gdouble src_ratio, dst_ratio;

    src_ratio = (gdouble) src.w / src.h;

    dst_ratio = (gdouble) dst.w / dst.h;

    if (src_ratio > dst_ratio) {

      result->w = dst.w;

      result->h = dst.w / src_ratio;

      result->x = 0;

      result->y = (dst.h - result->h) / 2;

    } else if (src_ratio < dst_ratio) {

      result->w = dst.h * src_ratio;

      result->h = dst.h;

      result->x = (dst.w - result->w) / 2;

      result->y = 0;

    } else {

      result->x = 0;

      result->y = 0;

      result->w = dst.w;

      result->h = dst.h;

    }

  }

  GST_DEBUG ("source is %dx%d dest is %dx%d, result is %dx%d with x,y %dx%d",

      src.w, src.h, dst.w, dst.h, result->w, result->h, result->x, result->y);

}

/* Initing stuff */

static void

gst_video_sink_init (GstVideoSink * videosink)

{

  videosink->width = 0;

  videosink->height = 0;

  /* 20ms is more than enough, 80-130ms is noticable */

  gst_base_sink_set_max_lateness (GST_BASE_SINK (videosink), 20 * GST_MSECOND);

  gst_base_sink_set_qos_enabled (GST_BASE_SINK (videosink), TRUE);

}

static void

gst_video_sink_class_init (GstVideoSinkClass * klass)

{

  GObjectClass *gobject_class;

  GstElementClass *gstelement_class;

  gobject_class = (GObjectClass *) klass;

  gstelement_class = (GstElementClass *) klass;

  parent_class = g_type_class_peek_parent (klass);

}

static void

gst_video_sink_base_init (gpointer g_class)

{

  GST_DEBUG_CATEGORY_INIT (video_sink_debug, "videosink", 0, "GstVideoSink");

}

/* Public methods */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

GType

gst_video_sink_get_type (void)

{

  static GType videosink_type = 0;

  if (!videosink_type) {

    static const GTypeInfo videosink_info = {

      sizeof (GstVideoSinkClass),

      gst_video_sink_base_init,

      NULL,

      (GClassInitFunc) gst_video_sink_class_init,

      NULL,

      NULL,

      sizeof (GstVideoSink),

      0,

      (GInstanceInitFunc) gst_video_sink_init,

    };

    videosink_type = g_type_register_static (GST_TYPE_BASE_SINK,

        "GstVideoSink", &videosink_info, 0);

  }

  return videosink_type;

}