gstreamer/gst/gstpipeline.c

/* GStreamer
 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
 *                    2000 Wim Taymans <wtay@chello.be>
 *
 * gstpipeline.c: Overall pipeline management element
 *
 * 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.
 */

//#define GST_DEBUG_ENABLED
#include "gst_private.h"

#include "gstpipeline.h"


GstElementDetails gst_pipeline_details = {
  "Pipeline object",
  "Bin",
  "Complete pipeline object",
  VERSION,
  "Erik Walthinsen <omega@cse.ogi.edu>",
  "(C) 1999",
};

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

enum {
  ARG_0,
  /* FILL ME */
};


static void			gst_pipeline_class_init		(GstPipelineClass *klass);
static void			gst_pipeline_init		(GstPipeline *pipeline);

static GstElementStateReturn	gst_pipeline_change_state	(GstElement *element);

static void			gst_pipeline_prepare		(GstPipeline *pipeline);


static GstBinClass *parent_class = NULL;
//static guint gst_pipeline_signals[LAST_SIGNAL] = { 0 };

GtkType
gst_pipeline_get_type (void) {
  static GtkType pipeline_type = 0;

  if (!pipeline_type) {
    static const GtkTypeInfo pipeline_info = {
      "GstPipeline",
      sizeof(GstPipeline),
      sizeof(GstPipelineClass),
      (GtkClassInitFunc)gst_pipeline_class_init,
      (GtkObjectInitFunc)gst_pipeline_init,
      (GtkArgSetFunc)NULL,
      (GtkArgGetFunc)NULL,
      (GtkClassInitFunc)NULL,
    };
    pipeline_type = gtk_type_unique (gst_bin_get_type (), &pipeline_info);
  }
  return pipeline_type;
}

static void
gst_pipeline_class_init (GstPipelineClass *klass)
{
  GstElementClass *gstelement_class;

  gstelement_class = (GstElementClass*)klass;

  parent_class = gtk_type_class(gst_bin_get_type());

  gstelement_class->change_state = gst_pipeline_change_state;
}

static void
gst_pipeline_init (GstPipeline *pipeline)
{
  // we're a manager by default
  GST_FLAG_SET (pipeline, GST_BIN_FLAG_MANAGER);
}


/**
 * gst_pipeline_new:
 * @name: name of new pipeline
 *
 * Create a new pipeline with the given name.
 *
 * Returns: newly created GstPipeline
 */
GstElement*
gst_pipeline_new (const guchar *name)
{
  return gst_elementfactory_make ("pipeline", name);
}

static void
gst_pipeline_prepare (GstPipeline *pipeline)
{
  GST_DEBUG (0,"GstPipeline: preparing pipeline \"%s\" for playing\n",
		  GST_ELEMENT_NAME(GST_ELEMENT(pipeline)));
}

static GstElementStateReturn
gst_pipeline_change_state (GstElement *element)
{
  GstPipeline *pipeline;

  g_return_val_if_fail (GST_IS_PIPELINE (element), FALSE);

  pipeline = GST_PIPELINE (element);

  switch (GST_STATE_TRANSITION (pipeline)) {
    case GST_STATE_NULL_TO_READY:
      // we need to set up internal state
      gst_pipeline_prepare (pipeline);
      break;
    default:
      break;
  }

  if (GST_ELEMENT_CLASS (parent_class)->change_state)
    return GST_ELEMENT_CLASS (parent_class)->change_state (element);

  return GST_STATE_SUCCESS;
}

/**
 * gst_pipeline_iterate:
 * @pipeline: #GstPipeline to iterate
 *
 * Cause the pipeline's contents to be run through one full 'iteration'.
 */
void
gst_pipeline_iterate (GstPipeline *pipeline)
{
  g_return_if_fail (pipeline != NULL);
  g_return_if_fail (GST_IS_PIPELINE(pipeline));
}