gstreamer/plugins/elements/gstfakesrc.c

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


#include <stdlib.h>
#include <string.h>

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

#include "gstfakesrc.h"
#include <gst/gstmarshal.h>

#define DEFAULT_SIZEMIN		0
#define DEFAULT_SIZEMAX		4096
#define DEFAULT_PARENTSIZE	4096*10

GST_DEBUG_CATEGORY_STATIC (gst_fakesrc_debug);
#define GST_CAT_DEFAULT gst_fakesrc_debug

GstElementDetails gst_fakesrc_details = GST_ELEMENT_DETAILS ("Fake Source",
    "Source",
    "Push empty (no data) buffers around",
    "Erik Walthinsen <omega@cse.ogi.edu>, "
    "Wim Taymans <wim.taymans@chello.be>");


/* FakeSrc signals and args */
enum
{
  /* FILL ME */
  SIGNAL_HANDOFF,
  LAST_SIGNAL
};

enum
{
  ARG_0,
  ARG_NUM_SOURCES,
  ARG_LOOP_BASED,
  ARG_OUTPUT,
  ARG_DATA,
  ARG_SIZETYPE,
  ARG_SIZEMIN,
  ARG_SIZEMAX,
  ARG_FILLTYPE,
  ARG_PATTERN,
  ARG_NUM_BUFFERS,
  ARG_EOS,
  ARG_SIGNAL_HANDOFFS,
  ARG_SILENT,
  ARG_DUMP,
  ARG_PARENTSIZE,
  ARG_LAST_MESSAGE
};

GstStaticPadTemplate fakesrc_src_template = GST_STATIC_PAD_TEMPLATE ("src%d",
    GST_PAD_SRC,
    GST_PAD_REQUEST,
    GST_STATIC_CAPS_ANY);

#define GST_TYPE_FAKESRC_OUTPUT (gst_fakesrc_output_get_type())
static GType
gst_fakesrc_output_get_type (void)
{
  static GType fakesrc_output_type = 0;
  static GEnumValue fakesrc_output[] = {
    {FAKESRC_FIRST_LAST_LOOP, "1", "First-Last loop"},
    {FAKESRC_LAST_FIRST_LOOP, "2", "Last-First loop"},
    {FAKESRC_PING_PONG, "3", "Ping-Pong"},
    {FAKESRC_ORDERED_RANDOM, "4", "Ordered Random"},
    {FAKESRC_RANDOM, "5", "Random"},
    {FAKESRC_PATTERN_LOOP, "6", "Patttern loop"},
    {FAKESRC_PING_PONG_PATTERN, "7", "Ping-Pong Pattern"},
    {FAKESRC_GET_ALWAYS_SUCEEDS, "8", "'_get' Always succeeds"},
    {0, NULL, NULL},
  };

  if (!fakesrc_output_type) {
    fakesrc_output_type =
        g_enum_register_static ("GstFakeSrcOutput", fakesrc_output);
  }
  return fakesrc_output_type;
}

#define GST_TYPE_FAKESRC_DATA (gst_fakesrc_data_get_type())
static GType
gst_fakesrc_data_get_type (void)
{
  static GType fakesrc_data_type = 0;
  static GEnumValue fakesrc_data[] = {
    {FAKESRC_DATA_ALLOCATE, "1", "Allocate data"},
    {FAKESRC_DATA_SUBBUFFER, "2", "Subbuffer data"},
    {0, NULL, NULL},
  };

  if (!fakesrc_data_type) {
    fakesrc_data_type = g_enum_register_static ("GstFakeSrcData", fakesrc_data);
  }
  return fakesrc_data_type;
}

#define GST_TYPE_FAKESRC_SIZETYPE (gst_fakesrc_sizetype_get_type())
static GType
gst_fakesrc_sizetype_get_type (void)
{
  static GType fakesrc_sizetype_type = 0;
  static GEnumValue fakesrc_sizetype[] = {
    {FAKESRC_SIZETYPE_NULL, "1", "Send empty buffers"},
    {FAKESRC_SIZETYPE_FIXED, "2", "Fixed size buffers (sizemax sized)"},
    {FAKESRC_SIZETYPE_RANDOM, "3",
        "Random sized buffers (sizemin <= size <= sizemax)"},
    {0, NULL, NULL},
  };

  if (!fakesrc_sizetype_type) {
    fakesrc_sizetype_type =
        g_enum_register_static ("GstFakeSrcSizeType", fakesrc_sizetype);
  }
  return fakesrc_sizetype_type;
}

#define GST_TYPE_FAKESRC_FILLTYPE (gst_fakesrc_filltype_get_type())
static GType
gst_fakesrc_filltype_get_type (void)
{
  static GType fakesrc_filltype_type = 0;
  static GEnumValue fakesrc_filltype[] = {
    {FAKESRC_FILLTYPE_NOTHING, "1", "Leave data as malloced"},
    {FAKESRC_FILLTYPE_NULL, "2", "Fill buffers with zeros"},
    {FAKESRC_FILLTYPE_RANDOM, "3", "Fill buffers with random crap"},
    {FAKESRC_FILLTYPE_PATTERN, "4", "Fill buffers with pattern 0x00 -> 0xff"},
    {FAKESRC_FILLTYPE_PATTERN_CONT, "5",
        "Fill buffers with pattern 0x00 -> 0xff that spans buffers"},
    {0, NULL, NULL},
  };

  if (!fakesrc_filltype_type) {
    fakesrc_filltype_type =
        g_enum_register_static ("GstFakeSrcFillType", fakesrc_filltype);
  }
  return fakesrc_filltype_type;
}

#define _do_init(bla) \
    GST_DEBUG_CATEGORY_INIT (gst_fakesrc_debug, "fakesrc", 0, "fakesrc element");

GST_BOILERPLATE_FULL (GstFakeSrc, gst_fakesrc, GstElement, GST_TYPE_ELEMENT,
    _do_init);

static GstPad *gst_fakesrc_request_new_pad (GstElement * element,
    GstPadTemplate * templ, const gchar * unused);
static void gst_fakesrc_update_functions (GstFakeSrc * src);
static void gst_fakesrc_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec);
static void gst_fakesrc_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec);

static GstElementStateReturn gst_fakesrc_change_state (GstElement * element);

static GstData *gst_fakesrc_get (GstPad * pad);
static void gst_fakesrc_loop (GstElement * element);

static guint gst_fakesrc_signals[LAST_SIGNAL] = { 0 };

static void
gst_fakesrc_base_init (gpointer g_class)
{
  GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);

  gst_element_class_set_details (gstelement_class, &gst_fakesrc_details);
  gst_element_class_add_pad_template (gstelement_class,
      gst_static_pad_template_get (&fakesrc_src_template));
}

static void
gst_fakesrc_class_init (GstFakeSrcClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;

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


  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_NUM_SOURCES,
      g_param_spec_int ("num-sources", "num-sources", "Number of sources",
          1, G_MAXINT, 1, G_PARAM_READABLE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_LOOP_BASED,
      g_param_spec_boolean ("loop-based", "loop-based",
          "Enable loop-based operation", FALSE, G_PARAM_READWRITE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_OUTPUT,
      g_param_spec_enum ("output", "output", "Output method (currently unused)",
          GST_TYPE_FAKESRC_OUTPUT, FAKESRC_FIRST_LAST_LOOP, G_PARAM_READWRITE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_DATA,
      g_param_spec_enum ("data", "data", "Data allocation method",
          GST_TYPE_FAKESRC_DATA, FAKESRC_DATA_ALLOCATE, G_PARAM_READWRITE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_SIZETYPE,
      g_param_spec_enum ("sizetype", "sizetype",
          "How to determine buffer sizes", GST_TYPE_FAKESRC_SIZETYPE,
          FAKESRC_SIZETYPE_NULL, G_PARAM_READWRITE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_SIZEMIN,
      g_param_spec_int ("sizemin", "sizemin", "Minimum buffer size", 0,
          G_MAXINT, DEFAULT_SIZEMIN, G_PARAM_READWRITE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_SIZEMAX,
      g_param_spec_int ("sizemax", "sizemax", "Maximum buffer size", 0,
          G_MAXINT, DEFAULT_SIZEMAX, G_PARAM_READWRITE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PARENTSIZE,
      g_param_spec_int ("parentsize", "parentsize",
          "Size of parent buffer for sub-buffered allocation", 0, G_MAXINT,
          DEFAULT_PARENTSIZE, G_PARAM_READWRITE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_FILLTYPE,
      g_param_spec_enum ("filltype", "filltype",
          "How to fill the buffer, if at all", GST_TYPE_FAKESRC_FILLTYPE,
          FAKESRC_FILLTYPE_NULL, G_PARAM_READWRITE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PATTERN,
      g_param_spec_string ("pattern", "pattern", "pattern", NULL,
          G_PARAM_READWRITE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_NUM_BUFFERS,
      g_param_spec_int ("num-buffers", "num-buffers",
          "Number of buffers to output before sending EOS", -1, G_MAXINT,
          0, G_PARAM_READWRITE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_EOS,
      g_param_spec_boolean ("eos", "eos", "Send out the EOS event?", TRUE,
          G_PARAM_READWRITE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_LAST_MESSAGE,
      g_param_spec_string ("last-message", "last-message",
          "The last status message", NULL, G_PARAM_READABLE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_SILENT,
      g_param_spec_boolean ("silent", "Silent",
          "Don't produce last_message events", FALSE, G_PARAM_READWRITE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_SIGNAL_HANDOFFS,
      g_param_spec_boolean ("signal-handoffs", "Signal handoffs",
          "Send a signal before pushing the buffer", FALSE, G_PARAM_READWRITE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_DUMP,
      g_param_spec_boolean ("dump", "Dump", "Dump produced bytes to stdout",
          FALSE, G_PARAM_READWRITE));

  gst_fakesrc_signals[SIGNAL_HANDOFF] =
      g_signal_new ("handoff", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
      G_STRUCT_OFFSET (GstFakeSrcClass, handoff), NULL, NULL,
      gst_marshal_VOID__POINTER_OBJECT, G_TYPE_NONE, 2,
      GST_TYPE_BUFFER | G_SIGNAL_TYPE_STATIC_SCOPE, GST_TYPE_PAD);

  gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_fakesrc_set_property);
  gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_fakesrc_get_property);

  gstelement_class->request_new_pad =
      GST_DEBUG_FUNCPTR (gst_fakesrc_request_new_pad);
  gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_fakesrc_change_state);
}

static void
gst_fakesrc_init (GstFakeSrc * fakesrc)
{
  GstPad *pad;

  /* create our first output pad */
  pad = gst_pad_new ("src", GST_PAD_SRC);
  gst_element_add_pad (GST_ELEMENT (fakesrc), pad);

  fakesrc->loop_based = FALSE;
  gst_fakesrc_update_functions (fakesrc);

  fakesrc->output = FAKESRC_FIRST_LAST_LOOP;
  fakesrc->segment_start = -1;
  fakesrc->segment_end = -1;
  fakesrc->num_buffers = -1;
  fakesrc->rt_num_buffers = -1;
  fakesrc->buffer_count = 0;
  fakesrc->silent = FALSE;
  fakesrc->signal_handoffs = FALSE;
  fakesrc->dump = FALSE;
  fakesrc->pattern_byte = 0x00;
  fakesrc->need_flush = FALSE;
  fakesrc->data = FAKESRC_DATA_ALLOCATE;
  fakesrc->sizetype = FAKESRC_SIZETYPE_NULL;
  fakesrc->filltype = FAKESRC_FILLTYPE_NOTHING;
  fakesrc->sizemin = DEFAULT_SIZEMIN;
  fakesrc->sizemax = DEFAULT_SIZEMAX;
  fakesrc->parent = NULL;
  fakesrc->parentsize = DEFAULT_PARENTSIZE;
  fakesrc->last_message = NULL;
}

static GstPad *
gst_fakesrc_request_new_pad (GstElement * element, GstPadTemplate * templ,
    const gchar * unused)
{
  gchar *name;
  GstPad *srcpad;
  GstFakeSrc *fakesrc;

  g_return_val_if_fail (GST_IS_FAKESRC (element), NULL);

  if (templ->direction != GST_PAD_SRC) {
    g_warning ("gstfakesrc: request new pad that is not a SRC pad\n");
    return NULL;
  }

  fakesrc = GST_FAKESRC (element);

  name = g_strdup_printf ("src%d", GST_ELEMENT (fakesrc)->numsrcpads);

  srcpad = gst_pad_new_from_template (templ, name);
  gst_element_add_pad (GST_ELEMENT (fakesrc), srcpad);
  gst_fakesrc_update_functions (fakesrc);

  g_free (name);

  return srcpad;
}

static const GstFormat *
gst_fakesrc_get_formats (GstPad * pad)
{
  static const GstFormat formats[] = {
    GST_FORMAT_DEFAULT,
    0,
  };

  return formats;
}

static const GstQueryType *
gst_fakesrc_get_query_types (GstPad * pad)
{
  static const GstQueryType types[] = {
    GST_QUERY_TOTAL,
    GST_QUERY_POSITION,
    GST_QUERY_START,
    GST_QUERY_SEGMENT_END,
    0,
  };

  return types;
}

static gboolean
gst_fakesrc_query (GstPad * pad, GstQueryType type,
    GstFormat * format, gint64 * value)
{
  GstFakeSrc *src = GST_FAKESRC (GST_PAD_PARENT (pad));

  switch (type) {
    case GST_QUERY_TOTAL:
      *value = src->num_buffers;
      break;
    case GST_QUERY_POSITION:
      *value = src->buffer_count;
      break;
    case GST_QUERY_START:
      *value = src->segment_start;
      break;
    case GST_QUERY_SEGMENT_END:
      *value = src->segment_end;
      break;
    default:
      return FALSE;
  }
  return TRUE;
}

static const GstEventMask *
gst_fakesrc_get_event_mask (GstPad * pad)
{
  static const GstEventMask masks[] = {
    {GST_EVENT_SEEK, GST_SEEK_FLAG_FLUSH},
    {GST_EVENT_SEEK_SEGMENT, GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_SEGMENT_LOOP},
    {GST_EVENT_FLUSH, 0},
    {0, 0},
  };

  return masks;
}

static gboolean
gst_fakesrc_event_handler (GstPad * pad, GstEvent * event)
{
  GstFakeSrc *src;

  src = GST_FAKESRC (gst_pad_get_parent (pad));

  switch (GST_EVENT_TYPE (event)) {
    case GST_EVENT_SEEK:
      src->buffer_count = GST_EVENT_SEEK_OFFSET (event);

      if (!GST_EVENT_SEEK_FLAGS (event) & GST_SEEK_FLAG_FLUSH) {
        break;
      }
      /* else we do a flush too */
    case GST_EVENT_SEEK_SEGMENT:
      src->segment_start = GST_EVENT_SEEK_OFFSET (event);
      src->segment_end = GST_EVENT_SEEK_ENDOFFSET (event);
      src->buffer_count = src->segment_start;
      src->segment_loop =
          GST_EVENT_SEEK_FLAGS (event) & GST_SEEK_FLAG_SEGMENT_LOOP;
      break;
    case GST_EVENT_FLUSH:
      src->need_flush = TRUE;
      break;
    default:
      break;
  }
  gst_event_unref (event);

  return TRUE;
}

static void
gst_fakesrc_update_functions (GstFakeSrc * src)
{
  GList *pads;

  if (src->loop_based) {
    gst_element_set_loop_function (GST_ELEMENT (src),
        GST_DEBUG_FUNCPTR (gst_fakesrc_loop));
  } else {
    gst_element_set_loop_function (GST_ELEMENT (src), NULL);
  }

  pads = GST_ELEMENT (src)->pads;
  while (pads) {
    GstPad *pad = GST_PAD (pads->data);

    if (src->loop_based) {
      gst_pad_set_get_function (pad, NULL);
    } else {
      gst_pad_set_get_function (pad, GST_DEBUG_FUNCPTR (gst_fakesrc_get));
    }

    gst_pad_set_event_function (pad, gst_fakesrc_event_handler);
    gst_pad_set_event_mask_function (pad, gst_fakesrc_get_event_mask);
    gst_pad_set_query_function (pad, gst_fakesrc_query);
    gst_pad_set_query_type_function (pad, gst_fakesrc_get_query_types);
    gst_pad_set_formats_function (pad, gst_fakesrc_get_formats);
    pads = g_list_next (pads);
  }
}

static void
gst_fakesrc_alloc_parent (GstFakeSrc * src)
{
  GstBuffer *buf;

  buf = gst_buffer_new ();
  GST_BUFFER_DATA (buf) = g_malloc (src->parentsize);
  GST_BUFFER_SIZE (buf) = src->parentsize;

  src->parent = buf;
  src->parentoffset = 0;
}

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

  /* it's not null if we got it, but it might not be ours */
  src = GST_FAKESRC (object);

  switch (prop_id) {
    case ARG_LOOP_BASED:
      src->loop_based = g_value_get_boolean (value);
      gst_fakesrc_update_functions (src);
      break;
    case ARG_OUTPUT:
      g_warning ("not yet implemented");
      break;
    case ARG_DATA:
      src->data = g_value_get_enum (value);

      if (src->data == FAKESRC_DATA_SUBBUFFER) {
        if (!src->parent)
          gst_fakesrc_alloc_parent (src);
      } else {
        if (src->parent) {
          gst_buffer_unref (src->parent);
          src->parent = NULL;
        }
      }
      break;
    case ARG_SIZETYPE:
      src->sizetype = g_value_get_enum (value);
      break;
    case ARG_SIZEMIN:
      src->sizemin = g_value_get_int (value);
      break;
    case ARG_SIZEMAX:
      src->sizemax = g_value_get_int (value);
      break;
    case ARG_PARENTSIZE:
      src->parentsize = g_value_get_int (value);
      break;
    case ARG_FILLTYPE:
      src->filltype = g_value_get_enum (value);
      break;
    case ARG_PATTERN:
      break;
    case ARG_NUM_BUFFERS:
      src->num_buffers = g_value_get_int (value);
      break;
    case ARG_EOS:
      src->eos = g_value_get_boolean (value);
      GST_INFO ("will EOS on next buffer");
      break;
    case ARG_SILENT:
      src->silent = g_value_get_boolean (value);
      break;
    case ARG_SIGNAL_HANDOFFS:
      src->signal_handoffs = g_value_get_boolean (value);
      break;
    case ARG_DUMP:
      src->dump = g_value_get_boolean (value);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

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

  /* it's not null if we got it, but it might not be ours */
  g_return_if_fail (GST_IS_FAKESRC (object));

  src = GST_FAKESRC (object);

  switch (prop_id) {
    case ARG_NUM_SOURCES:
      g_value_set_int (value, GST_ELEMENT (src)->numsrcpads);
      break;
    case ARG_LOOP_BASED:
      g_value_set_boolean (value, src->loop_based);
      break;
    case ARG_OUTPUT:
      g_value_set_enum (value, src->output);
      break;
    case ARG_DATA:
      g_value_set_enum (value, src->data);
      break;
    case ARG_SIZETYPE:
      g_value_set_enum (value, src->sizetype);
      break;
    case ARG_SIZEMIN:
      g_value_set_int (value, src->sizemin);
      break;
    case ARG_SIZEMAX:
      g_value_set_int (value, src->sizemax);
      break;
    case ARG_PARENTSIZE:
      g_value_set_int (value, src->parentsize);
      break;
    case ARG_FILLTYPE:
      g_value_set_enum (value, src->filltype);
      break;
    case ARG_PATTERN:
      g_value_set_string (value, src->pattern);
      break;
    case ARG_NUM_BUFFERS:
      g_value_set_int (value, src->num_buffers);
      break;
    case ARG_EOS:
      g_value_set_boolean (value, src->eos);
      break;
    case ARG_SILENT:
      g_value_set_boolean (value, src->silent);
      break;
    case ARG_SIGNAL_HANDOFFS:
      g_value_set_boolean (value, src->signal_handoffs);
      break;
    case ARG_DUMP:
      g_value_set_boolean (value, src->dump);
      break;
    case ARG_LAST_MESSAGE:
      g_value_set_string (value, src->last_message);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static void
gst_fakesrc_prepare_buffer (GstFakeSrc * src, GstBuffer * buf)
{
  if (GST_BUFFER_SIZE (buf) == 0)
    return;

  switch (src->filltype) {
    case FAKESRC_FILLTYPE_NULL:
      memset (GST_BUFFER_DATA (buf), 0, GST_BUFFER_SIZE (buf));
      break;
    case FAKESRC_FILLTYPE_RANDOM:
    {
      gint i;
      guint8 *ptr = GST_BUFFER_DATA (buf);

      for (i = GST_BUFFER_SIZE (buf); i; i--) {
        *ptr++ = (gint8) ((255.0) * rand () / (RAND_MAX));
      }
      break;
    }
    case FAKESRC_FILLTYPE_PATTERN:
      src->pattern_byte = 0x00;
    case FAKESRC_FILLTYPE_PATTERN_CONT:
    {
      gint i;
      guint8 *ptr = GST_BUFFER_DATA (buf);

      for (i = GST_BUFFER_SIZE (buf); i; i--) {
        *ptr++ = src->pattern_byte++;
      }
      break;
    }
    case FAKESRC_FILLTYPE_NOTHING:
    default:
      break;
  }
}

static GstBuffer *
gst_fakesrc_alloc_buffer (GstFakeSrc * src, guint size)
{
  GstBuffer *buf;

  buf = gst_buffer_new ();
  GST_BUFFER_SIZE (buf) = size;

  if (size != 0) {
    switch (src->filltype) {
      case FAKESRC_FILLTYPE_NOTHING:
        GST_BUFFER_DATA (buf) = g_malloc (size);
        break;
      case FAKESRC_FILLTYPE_NULL:
        GST_BUFFER_DATA (buf) = g_malloc0 (size);
        break;
      case FAKESRC_FILLTYPE_RANDOM:
      case FAKESRC_FILLTYPE_PATTERN:
      case FAKESRC_FILLTYPE_PATTERN_CONT:
      default:
        GST_BUFFER_DATA (buf) = g_malloc (size);
        gst_fakesrc_prepare_buffer (src, buf);
        break;
    }
  }

  return buf;
}

static guint
gst_fakesrc_get_size (GstFakeSrc * src)
{
  guint size;

  switch (src->sizetype) {
    case FAKESRC_SIZETYPE_FIXED:
      size = src->sizemax;
      break;
    case FAKESRC_SIZETYPE_RANDOM:
      size =
          src->sizemin +
          (guint8) (((gfloat) src->sizemax) * rand () / (RAND_MAX +
              (gfloat) src->sizemin));
      break;
    case FAKESRC_SIZETYPE_NULL:
    default:
      size = 0;
      break;
  }

  return size;
}

static GstBuffer *
gst_fakesrc_create_buffer (GstFakeSrc * src)
{
  GstBuffer *buf;
  guint size;
  gboolean dump = src->dump;

  size = gst_fakesrc_get_size (src);
  if (size == 0)
    return gst_buffer_new ();

  switch (src->data) {
    case FAKESRC_DATA_ALLOCATE:
      buf = gst_fakesrc_alloc_buffer (src, size);
      break;
    case FAKESRC_DATA_SUBBUFFER:
      /* see if we have a parent to subbuffer */
      if (!src->parent) {
        gst_fakesrc_alloc_parent (src);
        g_assert (src->parent);
      }
      /* see if it's large enough */
      if ((GST_BUFFER_SIZE (src->parent) - src->parentoffset) >= size) {
        buf = gst_buffer_create_sub (src->parent, src->parentoffset, size);
        src->parentoffset += size;
      } else {
        /* the parent is useless now */
        gst_buffer_unref (src->parent);
        src->parent = NULL;
        /* try again (this will allocate a new parent) */
        return gst_fakesrc_create_buffer (src);
      }
      gst_fakesrc_prepare_buffer (src, buf);
      break;
    default:
      g_warning ("fakesrc: dunno how to allocate buffers !");
      buf = gst_buffer_new ();
      break;
  }
  if (dump) {
    gst_util_dump_mem (GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
  }

  return buf;
}

static GstData *
gst_fakesrc_get (GstPad * pad)
{
  GstFakeSrc *src;
  GstBuffer *buf;

  g_return_val_if_fail (pad != NULL, NULL);

  src = GST_FAKESRC (GST_OBJECT_PARENT (pad));

  g_return_val_if_fail (GST_IS_FAKESRC (src), NULL);

  if (src->need_flush) {
    src->need_flush = FALSE;
    return GST_DATA (gst_event_new (GST_EVENT_FLUSH));
  }

  if (src->buffer_count == src->segment_end) {
    if (src->segment_loop) {
      return GST_DATA (gst_event_new (GST_EVENT_SEGMENT_DONE));
    } else {
      gst_element_set_eos (GST_ELEMENT (src));
      return GST_DATA (gst_event_new (GST_EVENT_EOS));
    }
  }

  if (src->rt_num_buffers == 0) {
    gst_element_set_eos (GST_ELEMENT (src));
    return GST_DATA (gst_event_new (GST_EVENT_EOS));
  } else {
    if (src->rt_num_buffers > 0)
      src->rt_num_buffers--;
  }

  if (src->eos) {
    GST_INFO ("fakesrc is setting eos on pad");
    return GST_DATA (gst_event_new (GST_EVENT_EOS));
  }

  buf = gst_fakesrc_create_buffer (src);
  GST_BUFFER_TIMESTAMP (buf) = src->buffer_count++;

  if (!src->silent) {
    g_free (src->last_message);

    src->last_message =
        g_strdup_printf ("get      ******* (%s:%s)> (%d bytes, %"
        G_GUINT64_FORMAT " ) %p", GST_DEBUG_PAD_NAME (pad),
        GST_BUFFER_SIZE (buf), GST_BUFFER_TIMESTAMP (buf), buf);

    g_object_notify (G_OBJECT (src), "last_message");
  }

  if (src->signal_handoffs) {
    GST_LOG_OBJECT (src, "pre handoff emit");
    g_signal_emit (G_OBJECT (src), gst_fakesrc_signals[SIGNAL_HANDOFF], 0,
        buf, pad);
    GST_LOG_OBJECT (src, "post handoff emit");
  }

  return GST_DATA (buf);
}

/**
 * gst_fakesrc_loop:
 * @element: the faksesrc to loop
 * 
 * generate an empty buffer and push it to the next element.
 */
static void
gst_fakesrc_loop (GstElement * element)
{
  GstFakeSrc *src;
  const GList *pads;

  g_return_if_fail (element != NULL);
  g_return_if_fail (GST_IS_FAKESRC (element));

  src = GST_FAKESRC (element);

  pads = gst_element_get_pad_list (element);

  while (pads) {
    GstPad *pad = GST_PAD (pads->data);
    GstData *data;

    data = gst_fakesrc_get (pad);
    gst_pad_push (pad, data);

    if (src->eos) {
      return;
    }

    pads = g_list_next (pads);
  }
}

static GstElementStateReturn
gst_fakesrc_change_state (GstElement * element)
{
  GstFakeSrc *fakesrc;

  g_return_val_if_fail (GST_IS_FAKESRC (element), GST_STATE_FAILURE);

  fakesrc = GST_FAKESRC (element);

  switch (GST_STATE_TRANSITION (element)) {
    case GST_STATE_NULL_TO_READY:
      break;
    case GST_STATE_READY_TO_PAUSED:
      fakesrc->buffer_count = 0;
      fakesrc->pattern_byte = 0x00;
      fakesrc->need_flush = FALSE;
      fakesrc->eos = FALSE;
      fakesrc->rt_num_buffers = fakesrc->num_buffers;
      break;
    case GST_STATE_PAUSED_TO_PLAYING:
    case GST_STATE_PLAYING_TO_PAUSED:
      break;
    case GST_STATE_PAUSED_TO_READY:
      if (fakesrc->parent) {
        gst_buffer_unref (fakesrc->parent);
        fakesrc->parent = NULL;
      }
      g_free (fakesrc->last_message);
      fakesrc->last_message = NULL;
      break;
    case GST_STATE_READY_TO_NULL:
      break;
    default:
      g_assert_not_reached ();
      break;
  }

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

  return GST_STATE_SUCCESS;
}