gstreamer/gst/realmedia/pnmsrc.c

/* GStreamer
 * Copyright (C) <2009> Wim Taymans <wim.taymans@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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

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

#include <string.h>

#include "pnmsrc.h"

GST_DEBUG_CATEGORY_STATIC (pnmsrc_debug);
#define GST_CAT_DEFAULT pnmsrc_debug

/* elementfactory information */
static const GstElementDetails gst_pnm_src_details =
GST_ELEMENT_DETAILS ("PNM packet receiver",
    "Source/Network",
    "Receive data over the network via PNM",
    "Wim Taymans <wim.taymans@gmail.com>");

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

#define DEFAULT_LOCATION	NULL

enum
{
  PROP_0,
  PROP_LOCATION,
  PROP_LAST
};

static GstStaticPadTemplate gst_pnm_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("application/vnd.rn-realmedia")
    );

static GstFlowReturn gst_pnm_src_create (GstPushSrc * psrc, GstBuffer ** buf);

static void gst_pnm_src_uri_handler_init (gpointer g_iface,
    gpointer iface_data);

static void
_do_init (GType pnmsrc_type)
{
  static const GInterfaceInfo urihandler_info = {
    gst_pnm_src_uri_handler_init,
    NULL,
    NULL
  };

  g_type_add_interface_static (pnmsrc_type, GST_TYPE_URI_HANDLER,
      &urihandler_info);
}

GST_BOILERPLATE_FULL (GstPNMSrc, gst_pnm_src, GstPushSrc, GST_TYPE_PUSH_SRC,
    _do_init);

static void gst_pnm_src_finalize (GObject * object);

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

static GstStateChangeReturn gst_pnm_src_change_state (GstElement *
    element, GstStateChange transition);

static void
gst_pnm_src_base_init (gpointer klass)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&gst_pnm_src_template));

  gst_element_class_set_details (element_class, &gst_pnm_src_details);

  GST_DEBUG_CATEGORY_INIT (pnmsrc_debug, "pnmsrc",
      0, "Source for the pnm:// uri");
}

static void
gst_pnm_src_class_init (GstPNMSrcClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;
  GstPushSrcClass *gstpushsrc_class;

  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;
  gstpushsrc_class = (GstPushSrcClass *) klass;

  parent_class = g_type_class_peek_parent (klass);

  gobject_class->set_property = gst_pnm_src_set_property;
  gobject_class->get_property = gst_pnm_src_get_property;

  gobject_class->finalize = gst_pnm_src_finalize;

  g_object_class_install_property (gobject_class, PROP_LOCATION,
      g_param_spec_string ("location", "PNM Location",
          "Location of the PNM url to read",
          DEFAULT_LOCATION, G_PARAM_READWRITE));

  gstelement_class->change_state = gst_pnm_src_change_state;

  gstpushsrc_class->create = gst_pnm_src_create;
}

static void
gst_pnm_src_init (GstPNMSrc * pnmsrc, GstPNMSrcClass * klass)
{
  pnmsrc->location = g_strdup (DEFAULT_LOCATION);
}

gboolean
gst_pnm_src_plugin_init (GstPlugin * plugin)
{
  return gst_element_register (plugin, "pnmsrc",
      GST_RANK_MARGINAL, GST_TYPE_PNM_SRC);
}

static void
gst_pnm_src_finalize (GObject * object)
{
  GstPNMSrc *pnmsrc;

  pnmsrc = GST_PNM_SRC (object);

  g_free (pnmsrc->location);

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

static void
gst_pnm_src_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec)
{
  GstPNMSrc *src;

  src = GST_PNM_SRC (object);

  switch (prop_id) {
    case PROP_LOCATION:
      g_free (src->location);
      src->location = g_value_dup_string (value);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static void
gst_pnm_src_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec)
{
  GstPNMSrc *src;

  src = GST_PNM_SRC (object);

  switch (prop_id) {
    case PROP_LOCATION:
      g_value_set_string (value, src->location);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static GstStateChangeReturn
gst_pnm_src_change_state (GstElement * element, GstStateChange transition)
{
  GstPNMSrc *src;
  GstStateChangeReturn ret;

  src = GST_PNM_SRC (element);

  switch (transition) {
    case GST_STATE_CHANGE_NULL_TO_READY:
      break;
    case GST_STATE_CHANGE_READY_TO_PAUSED:
      break;
    default:
      break;
  }

  ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);

  switch (transition) {
    case GST_STATE_CHANGE_PAUSED_TO_READY:
      break;
    case GST_STATE_CHANGE_READY_TO_NULL:
      break;
    default:
      break;
  }
  return ret;
}

static GstFlowReturn
gst_pnm_src_create (GstPushSrc * psrc, GstBuffer ** buf)
{
  GstPNMSrc *src;
  GstMessage *m;
  gchar *url;

  src = GST_PNM_SRC (psrc);

  if (src->location == NULL)
    return GST_FLOW_ERROR;
  url = g_strdup_printf ("rtsp%s", &src->location[3]);

  /* the only thing we do is redirect to an RTSP url */
  m = gst_message_new_element (GST_OBJECT_CAST (src),
      gst_structure_new ("redirect", "new-location", G_TYPE_STRING, url, NULL));
  g_free (url);

  gst_element_post_message (GST_ELEMENT_CAST (src), m);


  return GST_FLOW_UNEXPECTED;
}

/*** GSTURIHANDLER INTERFACE *************************************************/

static GstURIType
gst_pnm_src_uri_get_type (void)
{
  return GST_URI_SRC;
}

static gchar **
gst_pnm_src_uri_get_protocols (void)
{
  static gchar *protocols[] = { "pnm", NULL };

  return protocols;
}

static const gchar *
gst_pnm_src_uri_get_uri (GstURIHandler * handler)
{
  GstPNMSrc *src = GST_PNM_SRC (handler);

  return src->location;
}

static gboolean
gst_pnm_src_uri_set_uri (GstURIHandler * handler, const gchar * uri)
{
  GstPNMSrc *src = GST_PNM_SRC (handler);

  if (!g_str_has_prefix (uri, "pnm://"))
    return FALSE;

  g_free (src->location);
  src->location = g_strdup (uri);

  return TRUE;
}

static void
gst_pnm_src_uri_handler_init (gpointer g_iface, gpointer iface_data)
{
  GstURIHandlerInterface *iface = (GstURIHandlerInterface *) g_iface;

  iface->get_type = gst_pnm_src_uri_get_type;
  iface->get_protocols = gst_pnm_src_uri_get_protocols;
  iface->get_uri = gst_pnm_src_uri_get_uri;
  iface->set_uri = gst_pnm_src_uri_set_uri;
}