CVS surgery + support to move base, check, and net out of gst and into libs/gst

Original commit message from CVS:
CVS surgery + support to move base, check, and net out of gst
and into libs/gst

1 files changed, 0 insertions, 1583 deletions

diff --git a/gst/base/gstbasesink.c b/gst/base/gstbasesink.c
deleted file mode 100644
index 2f143dd97b..0000000000
--- a/gst/base/gstbasesink.c
+++ /dev/null
@@ -1,1583 +0,0 @@
-/* GStreamer
- * Copyright (C) 2005 Wim Taymans <wim@fluendo.com>
- *
- * gstbasesink.c: Base class for sink elements
- *
- * 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:gstbasesink
- * @short_description: Base class for sink elements
- * @see_also: #GstBaseTransform, #GstBaseSource
- *
- * GstBaseSink is the base class for sink elements in GStreamer, such as
- * xvimagesink or filesink. It is a layer on top of #GstElement that provides a
- * simplified interface to plugin writers. GstBaseSink handles many details for
- * you, for example preroll, clock synchronization, state changes, activation in
- * push or pull mode, and queries. In most cases, when writing sink elements,
- * there is no need to implement class methods from #GstElement or to set
- * functions on pads, because the GstBaseSink infrastructure is sufficient.
- *
- * There is only support in GstBaseSink for one sink pad, which should be named
- * "sink". A sink implementation (subclass of GstBaseSink) should install a pad
- * template in its base_init function, like so:
- * <programlisting>
- * static void
- * my_element_base_init (gpointer g_class)
- * {
- *   GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
- *   
- *   // sinktemplate should be a #GstStaticPadTemplate with direction
- *   // #GST_PAD_SINK and name "sink"
- *   gst_element_class_add_pad_template (gstelement_class,
- *       gst_static_pad_template_get (&amp;sinktemplate));
- *   // see #GstElementDetails
- *   gst_element_class_set_details (gstelement_class, &amp;details);
- * }
- * </programlisting>
- *
- * The one method which all subclasses of GstBaseSink must implement is
- * GstBaseSink::render. This method will be called...
- * 
- * preroll()
- *
- * event(): mostly useful for file-like sinks (seeking or flushing)
- *
- * get_caps/set_caps/buffer_alloc
- *
- * start/stop for resource allocation
- *
- * unlock if you block on an fd, for example
- *
- * get_times i'm sure is for something :P
- *
- * provide example of textsink
- *
- * admonishment not to try to implement your own sink with prerolling...
- *
- * extending via subclassing, setting pad functions, gstelement vmethods.
- */
-
-#ifdef HAVE_CONFIG_H
-#  include "config.h"
-#endif
-
-#include "gstbasesink.h"
-#include <gst/gstmarshal.h>
-#include <gst/gst-i18n-lib.h>
-
-GST_DEBUG_CATEGORY_STATIC (gst_base_sink_debug);
-#define GST_CAT_DEFAULT gst_base_sink_debug
-
-/* BaseSink signals and properties */
-enum
-{
-  /* FILL ME */
-  SIGNAL_HANDOFF,
-  LAST_SIGNAL
-};
-
-#define DEFAULT_SIZE 1024
-#define DEFAULT_CAN_ACTIVATE_PULL FALSE /* fixme: enable me */
-#define DEFAULT_CAN_ACTIVATE_PUSH TRUE
-
-#define DEFAULT_SYNC TRUE
-
-enum
-{
-  PROP_0,
-  PROP_PREROLL_QUEUE_LEN,
-  PROP_SYNC
-};
-
-static GstElementClass *parent_class = NULL;
-
-static void gst_base_sink_base_init (gpointer g_class);
-static void gst_base_sink_class_init (GstBaseSinkClass * klass);
-static void gst_base_sink_init (GstBaseSink * trans, gpointer g_class);
-static void gst_base_sink_finalize (GObject * object);
-
-GType
-gst_base_sink_get_type (void)
-{
-  static GType base_sink_type = 0;
-
-  if (!base_sink_type) {
-    static const GTypeInfo base_sink_info = {
-      sizeof (GstBaseSinkClass),
-      (GBaseInitFunc) gst_base_sink_base_init,
-      NULL,
-      (GClassInitFunc) gst_base_sink_class_init,
-      NULL,
-      NULL,
-      sizeof (GstBaseSink),
-      0,
-      (GInstanceInitFunc) gst_base_sink_init,
-    };
-
-    base_sink_type = g_type_register_static (GST_TYPE_ELEMENT,
-        "GstBaseSink", &base_sink_info, G_TYPE_FLAG_ABSTRACT);
-  }
-  return base_sink_type;
-}
-
-static void gst_base_sink_set_property (GObject * object, guint prop_id,
-    const GValue * value, GParamSpec * pspec);
-static void gst_base_sink_get_property (GObject * object, guint prop_id,
-    GValue * value, GParamSpec * pspec);
-
-static gboolean gst_base_sink_send_event (GstElement * element,
-    GstEvent * event);
-static gboolean gst_base_sink_query (GstElement * element, GstQuery * query);
-
-static GstCaps *gst_base_sink_get_caps (GstBaseSink * sink);
-static gboolean gst_base_sink_set_caps (GstBaseSink * sink, GstCaps * caps);
-static GstFlowReturn gst_base_sink_buffer_alloc (GstBaseSink * sink,
-    guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf);
-static void gst_base_sink_get_times (GstBaseSink * basesink, GstBuffer * buffer,
-    GstClockTime * start, GstClockTime * end);
-
-static GstStateChangeReturn gst_base_sink_change_state (GstElement * element,
-    GstStateChange transition);
-
-static GstFlowReturn gst_base_sink_chain (GstPad * pad, GstBuffer * buffer);
-static void gst_base_sink_loop (GstPad * pad);
-static gboolean gst_base_sink_activate (GstPad * pad);
-static gboolean gst_base_sink_activate_push (GstPad * pad, gboolean active);
-static gboolean gst_base_sink_activate_pull (GstPad * pad, gboolean active);
-static gboolean gst_base_sink_event (GstPad * pad, GstEvent * event);
-static inline GstFlowReturn gst_base_sink_handle_buffer (GstBaseSink * basesink,
-    GstBuffer * buf);
-static inline gboolean gst_base_sink_handle_event (GstBaseSink * basesink,
-    GstEvent * event);
-
-static void
-gst_base_sink_base_init (gpointer g_class)
-{
-  GST_DEBUG_CATEGORY_INIT (gst_base_sink_debug, "basesink", 0,
-      "basesink element");
-}
-
-static void
-gst_base_sink_class_init (GstBaseSinkClass * klass)
-{
-  GObjectClass *gobject_class;
-  GstElementClass *gstelement_class;
-
-  gobject_class = (GObjectClass *) klass;
-  gstelement_class = (GstElementClass *) klass;
-
-  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
-
-  gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_sink_finalize);
-  gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_base_sink_set_property);
-  gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_base_sink_get_property);
-
-  /* FIXME, this next value should be configured using an event from the
-   * upstream element */
-  g_object_class_install_property (G_OBJECT_CLASS (klass),
-      PROP_PREROLL_QUEUE_LEN,
-      g_param_spec_uint ("preroll-queue-len", "preroll-queue-len",
-          "Number of buffers to queue during preroll", 0, G_MAXUINT, 0,
-          G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
-  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SYNC,
-      g_param_spec_boolean ("sync", "Sync", "Sync on the clock", DEFAULT_SYNC,
-          G_PARAM_READWRITE));
-
-  gstelement_class->change_state =
-      GST_DEBUG_FUNCPTR (gst_base_sink_change_state);
-  gstelement_class->send_event = GST_DEBUG_FUNCPTR (gst_base_sink_send_event);
-  gstelement_class->query = GST_DEBUG_FUNCPTR (gst_base_sink_query);
-
-  klass->get_caps = GST_DEBUG_FUNCPTR (gst_base_sink_get_caps);
-  klass->set_caps = GST_DEBUG_FUNCPTR (gst_base_sink_set_caps);
-  klass->buffer_alloc = GST_DEBUG_FUNCPTR (gst_base_sink_buffer_alloc);
-  klass->get_times = GST_DEBUG_FUNCPTR (gst_base_sink_get_times);
-}
-
-static GstCaps *
-gst_base_sink_pad_getcaps (GstPad * pad)
-{
-  GstBaseSinkClass *bclass;
-  GstBaseSink *bsink;
-  GstCaps *caps = NULL;
-
-  bsink = GST_BASE_SINK (gst_pad_get_parent (pad));
-  bclass = GST_BASE_SINK_GET_CLASS (bsink);
-  if (bclass->get_caps)
-    caps = bclass->get_caps (bsink);
-
-  if (caps == NULL) {
-    GstPadTemplate *pad_template;
-
-    pad_template =
-        gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
-    if (pad_template != NULL) {
-      caps = gst_caps_ref (gst_pad_template_get_caps (pad_template));
-    }
-  }
-  gst_object_unref (bsink);
-
-  return caps;
-}
-
-static gboolean
-gst_base_sink_pad_setcaps (GstPad * pad, GstCaps * caps)
-{
-  GstBaseSinkClass *bclass;
-  GstBaseSink *bsink;
-  gboolean res = FALSE;
-
-  bsink = GST_BASE_SINK (gst_pad_get_parent (pad));
-  bclass = GST_BASE_SINK_GET_CLASS (bsink);
-
-  if (bclass->set_caps)
-    res = bclass->set_caps (bsink, caps);
-
-  gst_object_unref (bsink);
-
-  return res;
-}
-
-static GstFlowReturn
-gst_base_sink_pad_buffer_alloc (GstPad * pad, guint64 offset, guint size,
-    GstCaps * caps, GstBuffer ** buf)
-{
-  GstBaseSinkClass *bclass;
-  GstBaseSink *bsink;
-  GstFlowReturn result = GST_FLOW_OK;
-
-  bsink = GST_BASE_SINK (gst_pad_get_parent (pad));
-  bclass = GST_BASE_SINK_GET_CLASS (bsink);
-
-  if (bclass->buffer_alloc)
-    result = bclass->buffer_alloc (bsink, offset, size, caps, buf);
-  else
-    *buf = NULL;                /* fallback in gstpad.c will allocate generic buffer */
-
-  gst_object_unref (bsink);
-
-  return result;
-}
-
-static void
-gst_base_sink_init (GstBaseSink * basesink, gpointer g_class)
-{
-  GstPadTemplate *pad_template;
-
-  pad_template =
-      gst_element_class_get_pad_template (GST_ELEMENT_CLASS (g_class), "sink");
-  g_return_if_fail (pad_template != NULL);
-
-  basesink->sinkpad = gst_pad_new_from_template (pad_template, "sink");
-
-  gst_pad_set_getcaps_function (basesink->sinkpad,
-      GST_DEBUG_FUNCPTR (gst_base_sink_pad_getcaps));
-  gst_pad_set_setcaps_function (basesink->sinkpad,
-      GST_DEBUG_FUNCPTR (gst_base_sink_pad_setcaps));
-  gst_pad_set_bufferalloc_function (basesink->sinkpad,
-      GST_DEBUG_FUNCPTR (gst_base_sink_pad_buffer_alloc));
-  gst_pad_set_activate_function (basesink->sinkpad,
-      GST_DEBUG_FUNCPTR (gst_base_sink_activate));
-  gst_pad_set_activatepush_function (basesink->sinkpad,
-      GST_DEBUG_FUNCPTR (gst_base_sink_activate_push));
-  gst_pad_set_activatepull_function (basesink->sinkpad,
-      GST_DEBUG_FUNCPTR (gst_base_sink_activate_pull));
-  gst_pad_set_event_function (basesink->sinkpad,
-      GST_DEBUG_FUNCPTR (gst_base_sink_event));
-  gst_pad_set_chain_function (basesink->sinkpad,
-      GST_DEBUG_FUNCPTR (gst_base_sink_chain));
-  gst_element_add_pad (GST_ELEMENT (basesink), basesink->sinkpad);
-
-  basesink->pad_mode = GST_ACTIVATE_NONE;
-  GST_PAD_TASK (basesink->sinkpad) = NULL;
-  basesink->preroll_queue = g_queue_new ();
-
-  basesink->can_activate_push = DEFAULT_CAN_ACTIVATE_PUSH;
-  basesink->can_activate_pull = DEFAULT_CAN_ACTIVATE_PULL;
-
-  basesink->sync = DEFAULT_SYNC;
-
-  GST_OBJECT_FLAG_SET (basesink, GST_ELEMENT_IS_SINK);
-}
-
-static void
-gst_base_sink_finalize (GObject * object)
-{
-  GstBaseSink *basesink;
-
-  basesink = GST_BASE_SINK (object);
-
-  g_queue_free (basesink->preroll_queue);
-
-  G_OBJECT_CLASS (parent_class)->finalize (object);
-}
-
-static void
-gst_base_sink_set_property (GObject * object, guint prop_id,
-    const GValue * value, GParamSpec * pspec)
-{
-  GstBaseSink *sink = GST_BASE_SINK (object);
-
-  switch (prop_id) {
-    case PROP_PREROLL_QUEUE_LEN:
-      /* preroll lock necessary to serialize with finish_preroll */
-      GST_PAD_PREROLL_LOCK (sink->sinkpad);
-      sink->preroll_queue_max_len = g_value_get_uint (value);
-      GST_PAD_PREROLL_UNLOCK (sink->sinkpad);
-      break;
-    case PROP_SYNC:
-      sink->sync = g_value_get_boolean (value);
-      break;
-    default:
-      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
-      break;
-  }
-}
-
-static void
-gst_base_sink_get_property (GObject * object, guint prop_id, GValue * value,
-    GParamSpec * pspec)
-{
-  GstBaseSink *sink = GST_BASE_SINK (object);
-
-  GST_OBJECT_LOCK (sink);
-  switch (prop_id) {
-    case PROP_PREROLL_QUEUE_LEN:
-      g_value_set_uint (value, sink->preroll_queue_max_len);
-      break;
-    case PROP_SYNC:
-      g_value_set_boolean (value, sink->sync);
-      break;
-    default:
-      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
-      break;
-  }
-  GST_OBJECT_UNLOCK (sink);
-}
-
-static GstCaps *
-gst_base_sink_get_caps (GstBaseSink * sink)
-{
-  return NULL;
-}
-
-static gboolean
-gst_base_sink_set_caps (GstBaseSink * sink, GstCaps * caps)
-{
-  return TRUE;
-}
-
-static GstFlowReturn
-gst_base_sink_buffer_alloc (GstBaseSink * sink, guint64 offset, guint size,
-    GstCaps * caps, GstBuffer ** buf)
-{
-  *buf = NULL;
-  return GST_FLOW_OK;
-}
-
-/* with PREROLL_LOCK */
-static GstFlowReturn
-gst_base_sink_preroll_queue_empty (GstBaseSink * basesink, GstPad * pad)
-{
-  GstMiniObject *obj;
-  GQueue *q = basesink->preroll_queue;
-  GstFlowReturn ret;
-
-  ret = GST_FLOW_OK;
-
-  if (q) {
-    GST_DEBUG_OBJECT (basesink, "emptying queue");
-    while ((obj = g_queue_pop_head (q))) {
-      gboolean is_buffer;
-
-      is_buffer = GST_IS_BUFFER (obj);
-      if (G_LIKELY (is_buffer)) {
-        basesink->preroll_queued--;
-        basesink->buffers_queued--;
-      } else {
-        switch (GST_EVENT_TYPE (obj)) {
-          case GST_EVENT_EOS:
-            basesink->preroll_queued--;
-            break;
-          default:
-            break;
-        }
-        basesink->events_queued--;
-      }
-      /* we release the preroll lock while pushing so that we
-       * can still flush it while blocking on the clock or
-       * inside the element. */
-      GST_PAD_PREROLL_UNLOCK (pad);
-
-      if (G_LIKELY (is_buffer)) {
-        GST_DEBUG_OBJECT (basesink, "popped buffer %p", obj);
-        ret = gst_base_sink_handle_buffer (basesink, GST_BUFFER_CAST (obj));
-      } else {
-        GST_DEBUG_OBJECT (basesink, "popped event %p", obj);
-        gst_base_sink_handle_event (basesink, GST_EVENT_CAST (obj));
-        ret = GST_FLOW_OK;
-      }
-
-      GST_PAD_PREROLL_LOCK (pad);
-    }
-    GST_DEBUG_OBJECT (basesink, "queue empty");
-  }
-  return ret;
-}
-
-/* with PREROLL_LOCK */
-static void
-gst_base_sink_preroll_queue_flush (GstBaseSink * basesink, GstPad * pad)
-{
-  GstMiniObject *obj;
-  GQueue *q = basesink->preroll_queue;
-
-  GST_DEBUG_OBJECT (basesink, "flushing queue %p", basesink);
-  if (q) {
-    while ((obj = g_queue_pop_head (q))) {
-      GST_DEBUG_OBJECT (basesink, "popped %p", obj);
-      gst_mini_object_unref (obj);
-    }
-  }
-  /* we can't have EOS anymore now */
-  basesink->eos = FALSE;
-  basesink->eos_queued = FALSE;
-  basesink->preroll_queued = 0;
-  basesink->buffers_queued = 0;
-  basesink->events_queued = 0;
-  basesink->have_preroll = FALSE;
-  /* and signal any waiters now */
-  GST_PAD_PREROLL_SIGNAL (pad);
-}
-
-/* with PREROLL_LOCK */
-static gboolean
-gst_base_sink_commit_state (GstBaseSink * basesink)
-{
-  /* commit state and proceed to next pending state */
-  {
-    GstState current, next, pending, post_pending;
-    GstMessage *message;
-    gboolean post_paused = FALSE;
-    gboolean post_playing = FALSE;
-
-    GST_OBJECT_LOCK (basesink);
-    current = GST_STATE (basesink);
-    next = GST_STATE_NEXT (basesink);
-    pending = GST_STATE_PENDING (basesink);
-    post_pending = pending;
-
-    switch (pending) {
-      case GST_STATE_PLAYING:
-        basesink->need_preroll = FALSE;
-        post_playing = TRUE;
-        /* post PAUSED too when we were READY */
-        if (current == GST_STATE_READY) {
-          post_paused = TRUE;
-        }
-        break;
-      case GST_STATE_PAUSED:
-        basesink->need_preroll = TRUE;
-        post_paused = TRUE;
-        post_pending = GST_STATE_VOID_PENDING;
-        break;
-      case GST_STATE_READY:
-        goto stopping;
-      default:
-        break;
-    }
-
-    if (pending != GST_STATE_VOID_PENDING) {
-      GST_STATE (basesink) = pending;
-      GST_STATE_NEXT (basesink) = GST_STATE_VOID_PENDING;
-      GST_STATE_PENDING (basesink) = GST_STATE_VOID_PENDING;
-      GST_STATE_RETURN (basesink) = GST_STATE_CHANGE_SUCCESS;
-    }
-    GST_OBJECT_UNLOCK (basesink);
-
-    if (post_paused) {
-      message = gst_message_new_state_changed (GST_OBJECT_CAST (basesink),
-          current, next, post_pending);
-      gst_element_post_message (GST_ELEMENT_CAST (basesink), message);
-    }
-    if (post_playing) {
-      message = gst_message_new_state_changed (GST_OBJECT_CAST (basesink),
-          next, pending, GST_STATE_VOID_PENDING);
-      gst_element_post_message (GST_ELEMENT_CAST (basesink), message);
-    }
-    /* and mark dirty */
-    if (post_paused || post_playing) {
-      gst_element_post_message (GST_ELEMENT_CAST (basesink),
-          gst_message_new_state_dirty (GST_OBJECT_CAST (basesink)));
-    }
-
-    GST_STATE_BROADCAST (basesink);
-  }
-  return TRUE;
-
-stopping:
-  {
-    /* app is going to READY */
-    GST_OBJECT_UNLOCK (basesink);
-    return FALSE;
-  }
-}
-
-/* with STREAM_LOCK */
-static GstFlowReturn
-gst_base_sink_handle_object (GstBaseSink * basesink, GstPad * pad,
-    GstMiniObject * obj)
-{
-  gint length;
-  gboolean have_event;
-  GstFlowReturn ret;
-
-  GST_PAD_PREROLL_LOCK (pad);
-  /* push object on the queue */
-  GST_DEBUG_OBJECT (basesink, "push %p on preroll_queue", obj);
-  g_queue_push_tail (basesink->preroll_queue, obj);
-
-  have_event = GST_IS_EVENT (obj);
-  if (have_event) {
-    GstEvent *event = GST_EVENT (obj);
-
-    switch (GST_EVENT_TYPE (obj)) {
-      case GST_EVENT_EOS:
-        basesink->preroll_queued++;
-        basesink->eos = TRUE;
-        basesink->eos_queued = TRUE;
-        break;
-      case GST_EVENT_NEWSEGMENT:
-      {
-        gboolean update;
-        gdouble rate;
-        GstFormat format;
-        gint64 start;
-        gint64 stop;
-        gint64 time;
-
-        /* the newsegment event is needed to bring the buffer timestamps to the
-         * stream time and to drop samples outside of the playback segment. */
-        gst_event_parse_new_segment (event, &update, &rate, &format,
-            &start, &stop, &time);
-
-        basesink->have_newsegment = TRUE;
-
-        gst_segment_set_newsegment (&basesink->segment, update, rate, format,
-            start, stop, time);
-
-        GST_DEBUG_OBJECT (basesink,
-            "received NEWSEGMENT %" GST_TIME_FORMAT " -- %"
-            GST_TIME_FORMAT ", time %" GST_TIME_FORMAT ", accum %"
-            GST_TIME_FORMAT,
-            GST_TIME_ARGS (basesink->segment.start),
-            GST_TIME_ARGS (basesink->segment.stop),
-            GST_TIME_ARGS (basesink->segment.time),
-            GST_TIME_ARGS (basesink->segment.accum));
-        break;
-      }
-      default:
-        break;
-    }
-    basesink->events_queued++;
-  } else {
-    GstBuffer *buf = GST_BUFFER (obj);
-
-    if (!basesink->have_newsegment) {
-      GST_ELEMENT_WARNING (basesink, STREAM, FAILED,
-          (_("Internal data flow problem.")),
-          ("Received buffer without a new-segment. Cannot sync to clock."));
-      basesink->have_newsegment = TRUE;
-      /* this means this sink will not be able to sync to the clock */
-      basesink->segment.start = -1;
-      basesink->segment.stop = -1;
-    }
-
-    /* check if the buffer needs to be dropped */
-    if (TRUE) {
-      GstClockTime start = -1, end = -1;
-
-      /* we don't use the subclassed method as it may not return
-       * valid values for our purpose here */
-      gst_base_sink_get_times (basesink, buf, &start, &end);
-
-      GST_DEBUG_OBJECT (basesink, "got times start: %" GST_TIME_FORMAT
-          ", end: %" GST_TIME_FORMAT, GST_TIME_ARGS (start),
-          GST_TIME_ARGS (end));
-
-      if (GST_CLOCK_TIME_IS_VALID (start) &&
-          (basesink->segment.format == GST_FORMAT_TIME)) {
-        if (!gst_segment_clip (&basesink->segment, GST_FORMAT_TIME,
-                (gint64) start, (gint64) end, NULL, NULL))
-          goto dropping;
-      }
-    }
-    basesink->preroll_queued++;
-    basesink->buffers_queued++;
-  }
-
-  GST_DEBUG_OBJECT (basesink,
-      "now %d preroll, %d buffers, %d events on queue",
-      basesink->preroll_queued,
-      basesink->buffers_queued, basesink->events_queued);
-
-  /* check if we are prerolling */
-  if (!basesink->need_preroll)
-    goto no_preroll;
-
-  /* there is a buffer queued */
-  if (basesink->buffers_queued == 1) {
-    GST_DEBUG_OBJECT (basesink, "do preroll %p", obj);
-
-    /* if it's a buffer, we need to call the preroll method */
-    if (GST_IS_BUFFER (obj)) {
-      GstBaseSinkClass *bclass;
-      GstBuffer *buf = GST_BUFFER (obj);
-
-      GST_DEBUG_OBJECT (basesink, "preroll buffer %" GST_TIME_FORMAT,
-          GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
-
-      bclass = GST_BASE_SINK_GET_CLASS (basesink);
-      if (bclass->preroll)
-        if ((ret = bclass->preroll (basesink, buf)) != GST_FLOW_OK)
-          goto preroll_failed;
-    }
-  }
-  length = basesink->preroll_queued;
-  GST_DEBUG_OBJECT (basesink, "prerolled length %d", length);
-
-  if (length == 1) {
-
-    basesink->have_preroll = TRUE;
-
-    /* commit state */
-    if (!gst_base_sink_commit_state (basesink))
-      goto stopping;
-
-    GST_OBJECT_LOCK (pad);
-    if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
-      goto flushing;
-    GST_OBJECT_UNLOCK (pad);
-
-    /* it is possible that commiting the state made us go to PLAYING
-     * now in which case we don't need to block anymore. */
-    if (!basesink->need_preroll)
-      goto no_preroll;
-
-    length = basesink->preroll_queued;
-
-    /* FIXME: a pad probe could have made us lose the buffer, according
-     * to one of the python tests */
-    if (length == 0) {
-      GST_ERROR_OBJECT (basesink,
-          "preroll_queued dropped from 1 to 0 while committing state change");
-    }
-    g_assert (length <= 1);
-  }
-
-  /* see if we need to block now. We cannot block on events, only
-   * on buffers, the reason is that events can be sent from the
-   * application thread and we don't want to block there. */
-  if (length > basesink->preroll_queue_max_len && !have_event) {
-    /* block until the state changes, or we get a flush, or something */
-    GST_DEBUG_OBJECT (basesink, "waiting to finish preroll");
-    GST_PAD_PREROLL_WAIT (pad);
-    GST_DEBUG_OBJECT (basesink, "done preroll");
-    GST_OBJECT_LOCK (pad);
-    if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
-      goto flushing;
-    GST_OBJECT_UNLOCK (pad);
-  }
-  GST_PAD_PREROLL_UNLOCK (pad);
-
-  return GST_FLOW_OK;
-
-no_preroll:
-  {
-    GST_DEBUG_OBJECT (basesink, "no preroll needed");
-    /* maybe it was another sink that blocked in preroll, need to check for
-       buffers to drain */
-    basesink->have_preroll = FALSE;
-    ret = gst_base_sink_preroll_queue_empty (basesink, pad);
-    GST_PAD_PREROLL_UNLOCK (pad);
-
-    return ret;
-  }
-dropping:
-  {
-    GstBuffer *buf;
-
-    buf = GST_BUFFER (g_queue_pop_tail (basesink->preroll_queue));
-
-    gst_buffer_unref (buf);
-    GST_PAD_PREROLL_UNLOCK (pad);
-
-    return GST_FLOW_OK;
-  }
-flushing:
-  {
-    GST_OBJECT_UNLOCK (pad);
-    gst_base_sink_preroll_queue_flush (basesink, pad);
-    GST_PAD_PREROLL_UNLOCK (pad);
-    GST_DEBUG_OBJECT (basesink, "pad is flushing");
-
-    return GST_FLOW_WRONG_STATE;
-  }
-stopping:
-  {
-    GST_PAD_PREROLL_UNLOCK (pad);
-    GST_DEBUG_OBJECT (basesink, "stopping");
-
-    return GST_FLOW_WRONG_STATE;
-  }
-preroll_failed:
-  {
-    GST_DEBUG_OBJECT (basesink, "preroll failed");
-    gst_base_sink_preroll_queue_flush (basesink, pad);
-    GST_PAD_PREROLL_UNLOCK (pad);
-
-    GST_DEBUG_OBJECT (basesink, "abort state");
-    gst_element_abort_state (GST_ELEMENT (basesink));
-
-    return ret;
-  }
-}
-
-static gboolean
-gst_base_sink_event (GstPad * pad, GstEvent * event)
-{
-  GstBaseSink *basesink;
-  gboolean result = TRUE;
-  GstBaseSinkClass *bclass;
-
-  basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
-
-  bclass = GST_BASE_SINK_GET_CLASS (basesink);
-
-  GST_DEBUG_OBJECT (basesink, "event %p", event);
-
-  switch (GST_EVENT_TYPE (event)) {
-    case GST_EVENT_EOS:
-    {
-      GstFlowReturn ret;
-
-      /* EOS also finishes the preroll */
-      ret =
-          gst_base_sink_handle_object (basesink, pad, GST_MINI_OBJECT (event));
-      break;
-    }
-    case GST_EVENT_NEWSEGMENT:
-    {
-      GstFlowReturn ret;
-
-      ret =
-          gst_base_sink_handle_object (basesink, pad, GST_MINI_OBJECT (event));
-      break;
-    }
-    case GST_EVENT_FLUSH_START:
-      /* make sure we are not blocked on the clock also clear any pending
-       * eos state. */
-      if (bclass->event)
-        bclass->event (basesink, event);
-
-      GST_OBJECT_LOCK (basesink);
-      basesink->flushing = TRUE;
-      if (basesink->clock_id) {
-        gst_clock_id_unschedule (basesink->clock_id);
-      }
-      GST_OBJECT_UNLOCK (basesink);
-
-      GST_PAD_PREROLL_LOCK (pad);
-      /* we need preroll after the flush */
-      GST_DEBUG_OBJECT (basesink, "flushing, need preroll after flush");
-      basesink->need_preroll = TRUE;
-      /* unlock from a possible state change/preroll */
-      gst_base_sink_preroll_queue_flush (basesink, pad);
-      GST_PAD_PREROLL_UNLOCK (pad);
-
-      /* and we need to commit our state again on the next
-       * prerolled buffer */
-      GST_PAD_STREAM_LOCK (pad);
-      gst_element_lost_state (GST_ELEMENT (basesink));
-      GST_PAD_STREAM_UNLOCK (pad);
-      GST_DEBUG_OBJECT (basesink, "event unref %p %p", basesink, event);
-      gst_event_unref (event);
-      break;
-    case GST_EVENT_FLUSH_STOP:
-      if (bclass->event)
-        bclass->event (basesink, event);
-
-      /* now we are completely unblocked and the _chain method
-       * will return */
-      GST_OBJECT_LOCK (basesink);
-      basesink->flushing = FALSE;
-      GST_OBJECT_UNLOCK (basesink);
-      /* we need new segment info after the flush. */
-      gst_segment_init (&basesink->segment, GST_FORMAT_UNDEFINED);
-
-      GST_DEBUG_OBJECT (basesink, "event unref %p %p", basesink, event);
-      gst_event_unref (event);
-      break;
-    default:
-      gst_event_unref (event);
-      break;
-  }
-  gst_object_unref (basesink);
-
-  return result;
-}
-
-/* default implementation to calculate the start and end
- * timestamps on a buffer, subclasses can override
- */
-static void
-gst_base_sink_get_times (GstBaseSink * basesink, GstBuffer * buffer,
-    GstClockTime * start, GstClockTime * end)
-{
-  GstClockTime timestamp, duration;
-
-  timestamp = GST_BUFFER_TIMESTAMP (buffer);
-  if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
-
-    /* get duration to calculate end time */
-    duration = GST_BUFFER_DURATION (buffer);
-    if (GST_CLOCK_TIME_IS_VALID (duration)) {
-      *end = timestamp + duration;
-    }
-    *start = timestamp;
-  }
-}
-
-/* with STREAM_LOCK and LOCK*/
-static GstClockReturn
-gst_base_sink_wait (GstBaseSink * basesink, GstClockTime time)
-{
-  GstClockReturn ret;
-  GstClockID id;
-
-  /* no need to attempt a clock wait if we are flushing */
-  if (basesink->flushing) {
-    return GST_CLOCK_UNSCHEDULED;
-  }
-
-  /* clock_id should be NULL outside of this function */
-  g_assert (basesink->clock_id == NULL);
-  g_assert (GST_CLOCK_TIME_IS_VALID (time));
-
-  id = gst_clock_new_single_shot_id (GST_ELEMENT_CLOCK (basesink), time);
-
-  basesink->clock_id = id;
-  /* release the object lock while waiting */
-  GST_OBJECT_UNLOCK (basesink);
-
-  ret = gst_clock_id_wait (id, NULL);
-
-  GST_OBJECT_LOCK (basesink);
-  gst_clock_id_unref (id);
-  basesink->clock_id = NULL;
-
-  return ret;
-}
-
-/* perform synchronisation on a buffer
- *
- * 1) check if we have a clock, if not, do nothing
- * 2) calculate the start and end time of the buffer
- * 3) create a single shot notification to wait on
- *    the clock, save the entry so we can unlock it
- * 4) wait on the clock, this blocks
- * 5) unref the clockid again
- */
-static GstClockReturn
-gst_base_sink_do_sync (GstBaseSink * basesink, GstBuffer * buffer)
-{
-  GstClockReturn result = GST_CLOCK_OK;
-  GstClockTime start, end;
-  gint64 cstart, cend;
-  GstBaseSinkClass *bclass;
-
-  bclass = GST_BASE_SINK_GET_CLASS (basesink);
-
-  start = end = -1;
-  if (bclass->get_times)
-    bclass->get_times (basesink, buffer, &start, &end);
-
-  GST_DEBUG_OBJECT (basesink, "got times start: %" GST_TIME_FORMAT
-      ", end: %" GST_TIME_FORMAT, GST_TIME_ARGS (start), GST_TIME_ARGS (end));
-
-  /* if we don't have a timestamp, we don't sync */
-  if (!GST_CLOCK_TIME_IS_VALID (start)) {
-    GST_DEBUG_OBJECT (basesink, "start not valid");
-    goto done;
-  }
-
-  if (basesink->segment.format == GST_FORMAT_TIME) {
-    /* save last times seen. */
-    if (GST_CLOCK_TIME_IS_VALID (end))
-      gst_segment_set_last_stop (&basesink->segment, GST_FORMAT_TIME,
-          (gint64) end);
-    else
-      gst_segment_set_last_stop (&basesink->segment, GST_FORMAT_TIME,
-          (gint64) start);
-
-    /* clip */
-    if (!gst_segment_clip (&basesink->segment, GST_FORMAT_TIME,
-            (gint64) start, (gint64) end, &cstart, &cend))
-      goto out_of_segment;
-  } else {
-    /* no clipping for formats different from GST_FORMAT_TIME */
-    cstart = start;
-    cend = end;
-  }
-
-  if (!basesink->sync) {
-    GST_DEBUG_OBJECT (basesink, "no need to sync");
-    goto done;
-  }
-
-  /* now do clocking */
-  if (GST_ELEMENT_CLOCK (basesink)
-      && ((basesink->segment.format == GST_FORMAT_TIME)
-          || (basesink->segment.accum == 0))) {
-    GstClockTime base_time;
-    GstClockTimeDiff stream_start, stream_end;
-
-    stream_start =
-        gst_segment_to_running_time (&basesink->segment, GST_FORMAT_TIME,
-        cstart);
-    stream_end =
-        gst_segment_to_running_time (&basesink->segment, GST_FORMAT_TIME, cend);
-
-    GST_OBJECT_LOCK (basesink);
-
-    base_time = GST_ELEMENT_CAST (basesink)->base_time;
-
-    GST_LOG_OBJECT (basesink,
-        "waiting for clock, base time %" GST_TIME_FORMAT
-        " stream_start %" GST_TIME_FORMAT,
-        GST_TIME_ARGS (base_time), GST_TIME_ARGS (stream_start));
-
-    /* also save end_time of this buffer so that we can wait
-     * to signal EOS */
-    if (GST_CLOCK_TIME_IS_VALID (stream_end))
-      basesink->end_time = stream_end + base_time;
-    else
-      basesink->end_time = GST_CLOCK_TIME_NONE;
-
-    result = gst_base_sink_wait (basesink, stream_start + base_time);
-
-    GST_OBJECT_UNLOCK (basesink);
-
-    GST_LOG_OBJECT (basesink, "clock entry done: %d", result);
-  } else {
-    GST_DEBUG_OBJECT (basesink, "no clock, not syncing");
-  }
-
-done:
-  return result;
-
-out_of_segment:
-  {
-    GST_LOG_OBJECT (basesink, "buffer skipped, not in segment");
-    return GST_CLOCK_UNSCHEDULED;
-  }
-}
-
-
-/* handle an event
- *
- * 2) render the event
- * 3) unref the event
- */
-static inline gboolean
-gst_base_sink_handle_event (GstBaseSink * basesink, GstEvent * event)
-{
-  GstBaseSinkClass *bclass;
-  gboolean ret;
-
-  switch (GST_EVENT_TYPE (event)) {
-    case GST_EVENT_EOS:
-      GST_OBJECT_LOCK (basesink);
-      if (GST_ELEMENT_CLOCK (basesink)) {
-        /* wait for last buffer to finish if we have a valid end time */
-        if (GST_CLOCK_TIME_IS_VALID (basesink->end_time)) {
-          gst_base_sink_wait (basesink, basesink->end_time);
-          basesink->end_time = GST_CLOCK_TIME_NONE;
-        }
-      }
-      GST_OBJECT_UNLOCK (basesink);
-      break;
-    default:
-      break;
-  }
-
-  bclass = GST_BASE_SINK_GET_CLASS (basesink);
-  if (bclass->event)
-    ret = bclass->event (basesink, event);
-  else
-    ret = TRUE;
-
-  switch (GST_EVENT_TYPE (event)) {
-    case GST_EVENT_EOS:
-      GST_PAD_PREROLL_LOCK (basesink->sinkpad);
-      /* if we are still EOS, we can post the EOS message */
-      if (basesink->eos) {
-        /* ok, now we can post the message */
-        GST_DEBUG_OBJECT (basesink, "Now posting EOS");
-        gst_element_post_message (GST_ELEMENT_CAST (basesink),
-            gst_message_new_eos (GST_OBJECT_CAST (basesink)));
-        basesink->eos_queued = FALSE;
-      }
-      GST_PAD_PREROLL_UNLOCK (basesink->sinkpad);
-      break;
-    default:
-      break;
-  }
-
-  GST_DEBUG_OBJECT (basesink, "event unref %p %p", basesink, event);
-  gst_event_unref (event);
-
-  return ret;
-}
-
-/* handle a buffer
- *
- * 1) first sync on the buffer
- * 2) render the buffer
- * 3) unref the buffer
- */
-static inline GstFlowReturn
-gst_base_sink_handle_buffer (GstBaseSink * basesink, GstBuffer * buf)
-{
-  GstFlowReturn ret = GST_FLOW_OK;
-  GstClockReturn status;
-
-  status = gst_base_sink_do_sync (basesink, buf);
-  switch (status) {
-    case GST_CLOCK_EARLY:
-      GST_DEBUG_OBJECT (basesink, "buffer too late!, rendering anyway");
-      /* fallthrough for now */
-    case GST_CLOCK_OK:
-    {
-      GstBaseSinkClass *bclass;
-
-      bclass = GST_BASE_SINK_GET_CLASS (basesink);
-      if (bclass->render)
-        ret = bclass->render (basesink, buf);
-      break;
-    }
-    default:
-      GST_DEBUG_OBJECT (basesink, "clock returned %d, not rendering", status);
-      break;
-  }
-
-  GST_DEBUG_OBJECT (basesink, "buffer unref after render %p", basesink, buf);
-  gst_buffer_unref (buf);
-
-  return ret;
-}
-
-static GstFlowReturn
-gst_base_sink_chain (GstPad * pad, GstBuffer * buf)
-{
-  GstBaseSink *basesink;
-  GstFlowReturn result;
-
-  basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
-
-  if (!(basesink->pad_mode == GST_ACTIVATE_PUSH)) {
-    GST_OBJECT_LOCK (pad);
-    g_warning ("Push on pad %s:%s, but it was not activated in push mode",
-        GST_DEBUG_PAD_NAME (pad));
-    GST_OBJECT_UNLOCK (pad);
-    result = GST_FLOW_UNEXPECTED;
-    goto done;
-  }
-
-  result =
-      gst_base_sink_handle_object (basesink, pad, GST_MINI_OBJECT_CAST (buf));
-
-done:
-  gst_object_unref (basesink);
-
-  return result;
-}
-
-static void
-gst_base_sink_loop (GstPad * pad)
-{
-  GstBaseSink *basesink;
-  GstBuffer *buf = NULL;
-  GstFlowReturn result;
-
-  basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
-
-  g_assert (basesink->pad_mode == GST_ACTIVATE_PULL);
-
-  result = gst_pad_pull_range (pad, basesink->offset, DEFAULT_SIZE, &buf);
-  if (result != GST_FLOW_OK)
-    goto paused;
-
-  result = gst_base_sink_handle_object (basesink, pad, GST_MINI_OBJECT (buf));
-  if (result != GST_FLOW_OK)
-    goto paused;
-
-  gst_object_unref (basesink);
-
-  /* default */
-  return;
-
-paused:
-  {
-    gst_base_sink_event (pad, gst_event_new_eos ());
-    gst_object_unref (basesink);
-    gst_pad_pause_task (pad);
-    return;
-  }
-}
-
-static gboolean
-gst_base_sink_deactivate (GstBaseSink * basesink, GstPad * pad)
-{
-  gboolean result = FALSE;
-  GstBaseSinkClass *bclass;
-
-  bclass = GST_BASE_SINK_GET_CLASS (basesink);
-
-  /* step 1, unblock clock sync (if any) or any other blocking thing */
-  GST_PAD_PREROLL_LOCK (pad);
-  GST_OBJECT_LOCK (basesink);
-  if (basesink->clock_id) {
-    gst_clock_id_unschedule (basesink->clock_id);
-  }
-  GST_OBJECT_UNLOCK (basesink);
-
-  /* unlock any subclasses */
-  if (bclass->unlock)
-    bclass->unlock (basesink);
-
-  /* flush out the data thread if it's locked in finish_preroll */
-  GST_DEBUG_OBJECT (basesink,
-      "flushing out data thread, need preroll to FALSE");
-  basesink->need_preroll = FALSE;
-  gst_base_sink_preroll_queue_flush (basesink, pad);
-  GST_PAD_PREROLL_SIGNAL (pad);
-  GST_PAD_PREROLL_UNLOCK (pad);
-
-  /* step 2, make sure streaming finishes */
-  result = gst_pad_stop_task (pad);
-
-  return result;
-}
-
-static gboolean
-gst_base_sink_activate (GstPad * pad)
-{
-  gboolean result = FALSE;
-  GstBaseSink *basesink;
-
-  basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
-
-  GST_DEBUG_OBJECT (basesink, "Trying pull mode first");
-
-  if (basesink->can_activate_pull && gst_pad_check_pull_range (pad)
-      && gst_pad_activate_pull (pad, TRUE)) {
-    GST_DEBUG_OBJECT (basesink, "Success activating pull mode");
-    result = TRUE;
-  } else {
-    GST_DEBUG_OBJECT (basesink, "Falling back to push mode");
-    if (gst_pad_activate_push (pad, TRUE)) {
-      GST_DEBUG_OBJECT (basesink, "Success activating push mode");
-      result = TRUE;
-    }
-  }
-
-  if (!result) {
-    GST_WARNING_OBJECT (basesink, "Could not activate pad in either mode");
-  }
-
-  gst_object_unref (basesink);
-
-  return result;
-}
-
-static gboolean
-gst_base_sink_activate_push (GstPad * pad, gboolean active)
-{
-  gboolean result;
-  GstBaseSink *basesink;
-
-  basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
-
-  if (active) {
-    if (!basesink->can_activate_push) {
-      result = FALSE;
-      basesink->pad_mode = GST_ACTIVATE_NONE;
-    } else {
-      result = TRUE;
-      basesink->pad_mode = GST_ACTIVATE_PUSH;
-    }
-  } else {
-    if (G_UNLIKELY (basesink->pad_mode != GST_ACTIVATE_PUSH)) {
-      g_warning ("Internal GStreamer activation error!!!");
-      result = FALSE;
-    } else {
-      result = gst_base_sink_deactivate (basesink, pad);
-      basesink->pad_mode = GST_ACTIVATE_NONE;
-    }
-  }
-
-  gst_object_unref (basesink);
-
-  return result;
-}
-
-/* this won't get called until we implement an activate function */
-static gboolean
-gst_base_sink_activate_pull (GstPad * pad, gboolean active)
-{
-  gboolean result = FALSE;
-  GstBaseSink *basesink;
-
-  basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
-
-  if (active) {
-    if (!basesink->can_activate_pull) {
-      result = FALSE;
-      basesink->pad_mode = GST_ACTIVATE_NONE;
-    } else {
-      GstPad *peer = gst_pad_get_peer (pad);
-
-      if (G_UNLIKELY (peer == NULL)) {
-        g_warning ("Trying to activate pad in pull mode, but no peer");
-        result = FALSE;
-        basesink->pad_mode = GST_ACTIVATE_NONE;
-      } else {
-        if (gst_pad_activate_pull (peer, TRUE)) {
-          basesink->have_newsegment = TRUE;
-          gst_segment_init (&basesink->segment, GST_FORMAT_UNDEFINED);
-
-          /* set the pad mode before starting the task so that it's in the
-             correct state for the new thread... */
-          basesink->pad_mode = GST_ACTIVATE_PULL;
-          result =
-              gst_pad_start_task (pad, (GstTaskFunction) gst_base_sink_loop,
-              pad);
-          /* but if starting the thread fails, set it back */
-          if (!result)
-            basesink->pad_mode = GST_ACTIVATE_NONE;
-        } else {
-          GST_DEBUG_OBJECT (pad, "Failed to activate peer in pull mode");
-          result = FALSE;
-          basesink->pad_mode = GST_ACTIVATE_NONE;
-        }
-        gst_object_unref (peer);
-      }
-    }
-  } else {
-    if (G_UNLIKELY (basesink->pad_mode != GST_ACTIVATE_PULL)) {
-      g_warning ("Internal GStreamer activation error!!!");
-      result = FALSE;
-    } else {
-      basesink->have_newsegment = FALSE;
-      result = gst_base_sink_deactivate (basesink, pad);
-      basesink->pad_mode = GST_ACTIVATE_NONE;
-    }
-  }
-
-  gst_object_unref (basesink);
-
-  return result;
-}
-
-static gboolean
-gst_base_sink_send_event (GstElement * element, GstEvent * event)
-{
-  GstPad *pad;
-  GstBaseSink *basesink = GST_BASE_SINK (element);
-  gboolean result;
-
-  GST_OBJECT_LOCK (element);
-  pad = basesink->sinkpad;
-  gst_object_ref (pad);
-  GST_OBJECT_UNLOCK (element);
-
-  result = gst_pad_push_event (pad, event);
-
-  gst_object_unref (pad);
-
-  return result;
-}
-
-static gboolean
-gst_base_sink_peer_query (GstBaseSink * sink, GstQuery * query)
-{
-  GstPad *peer;
-  gboolean res = FALSE;
-
-  if ((peer = gst_pad_get_peer (sink->sinkpad))) {
-    res = gst_pad_query (peer, query);
-    gst_object_unref (peer);
-  }
-  return res;
-}
-
-static gboolean
-gst_base_sink_get_position (GstBaseSink * basesink, GstFormat format,
-    gint64 * cur)
-{
-  GstClock *clock;
-  gboolean res = FALSE;
-
-  switch (format) {
-    case GST_FORMAT_TIME:
-    {
-      /* we can answer time format */
-      GST_OBJECT_LOCK (basesink);
-      if ((clock = GST_ELEMENT_CLOCK (basesink))) {
-        GstClockTime now;
-        gint64 time;
-
-        gst_object_ref (clock);
-        GST_OBJECT_UNLOCK (basesink);
-
-        now = gst_clock_get_time (clock);
-
-        GST_OBJECT_LOCK (basesink);
-        if (GST_CLOCK_TIME_IS_VALID (basesink->segment.time))
-          time = basesink->segment.time;
-        else
-          time = 0;
-
-        *cur = now - GST_ELEMENT_CAST (basesink)->base_time -
-            basesink->segment.accum + time;
-
-        GST_DEBUG_OBJECT (basesink,
-            "now %" GST_TIME_FORMAT " + segment_time %" GST_TIME_FORMAT " = %"
-            GST_TIME_FORMAT, GST_TIME_ARGS (now),
-            GST_TIME_ARGS (time), GST_TIME_ARGS (*cur));
-
-        gst_object_unref (clock);
-
-        res = TRUE;
-      }
-      GST_OBJECT_UNLOCK (basesink);
-    }
-    default:
-      break;
-  }
-  return res;
-}
-
-static gboolean
-gst_base_sink_query (GstElement * element, GstQuery * query)
-{
-  gboolean res = FALSE;
-
-  GstBaseSink *basesink = GST_BASE_SINK (element);
-
-  switch (GST_QUERY_TYPE (query)) {
-    case GST_QUERY_POSITION:
-    {
-      gint64 cur = 0;
-      GstFormat format;
-      gboolean eos;
-
-      GST_PAD_PREROLL_LOCK (basesink->sinkpad);
-      eos = basesink->eos;
-      GST_PAD_PREROLL_UNLOCK (basesink->sinkpad);
-
-      if (eos) {
-        res = gst_base_sink_peer_query (basesink, query);
-      } else {
-        gst_query_parse_position (query, &format, NULL);
-
-        GST_DEBUG_OBJECT (basesink, "current position format %d", format);
-
-        if ((res = gst_base_sink_get_position (basesink, format, &cur))) {
-          gst_query_set_position (query, format, cur);
-        } else {
-          res = gst_base_sink_peer_query (basesink, query);
-        }
-      }
-      break;
-    }
-    case GST_QUERY_DURATION:
-      res = gst_base_sink_peer_query (basesink, query);
-      break;
-    case GST_QUERY_LATENCY:
-      break;
-    case GST_QUERY_JITTER:
-      break;
-    case GST_QUERY_RATE:
-      //gst_query_set_rate (query, basesink->segment_rate);
-      res = TRUE;
-      break;
-    case GST_QUERY_SEGMENT:
-    {
-      /* FIXME, bring start/stop to stream time */
-      gst_query_set_segment (query, basesink->segment.rate,
-          GST_FORMAT_TIME, basesink->segment.start, basesink->segment.stop);
-      break;
-    }
-    case GST_QUERY_SEEKING:
-    case GST_QUERY_CONVERT:
-    case GST_QUERY_FORMATS:
-    default:
-      res = gst_base_sink_peer_query (basesink, query);
-      break;
-  }
-  return res;
-}
-
-static GstStateChangeReturn
-gst_base_sink_change_state (GstElement * element, GstStateChange transition)
-{
-  GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
-  GstBaseSink *basesink = GST_BASE_SINK (element);
-  GstBaseSinkClass *bclass;
-
-  bclass = GST_BASE_SINK_GET_CLASS (basesink);
-
-  switch (transition) {
-    case GST_STATE_CHANGE_NULL_TO_READY:
-      if (bclass->start)
-        if (!bclass->start (basesink))
-          goto start_failed;
-      break;
-    case GST_STATE_CHANGE_READY_TO_PAUSED:
-      /* need to complete preroll before this state change completes, there
-       * is no data flow in READY so we can safely assume we need to preroll. */
-      basesink->offset = 0;
-      GST_PAD_PREROLL_LOCK (basesink->sinkpad);
-      basesink->have_preroll = FALSE;
-      GST_DEBUG_OBJECT (basesink, "READY to PAUSED, need preroll to FALSE");
-      basesink->need_preroll = TRUE;
-      GST_PAD_PREROLL_UNLOCK (basesink->sinkpad);
-      gst_segment_init (&basesink->segment, GST_FORMAT_UNDEFINED);
-      basesink->have_newsegment = FALSE;
-      ret = GST_STATE_CHANGE_ASYNC;
-      break;
-    case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
-      GST_PAD_PREROLL_LOCK (basesink->sinkpad);
-      /* no preroll needed */
-      basesink->need_preroll = FALSE;
-
-      /* if we have EOS, we should empty the queue now as there will
-       * be no more data received in the chain function.
-       * FIXME, this could block the state change function too long when
-       * we are pushing and syncing the buffers, better start a new
-       * thread to do this. */
-      if (basesink->eos) {
-        gboolean do_eos = !basesink->eos_queued;
-
-        gst_base_sink_preroll_queue_empty (basesink, basesink->sinkpad);
-
-        /* need to post EOS message here if it was not in the preroll queue we
-         * just emptied. */
-        if (do_eos) {
-          GST_DEBUG_OBJECT (basesink, "Now posting EOS");
-          gst_element_post_message (GST_ELEMENT_CAST (basesink),
-              gst_message_new_eos (GST_OBJECT_CAST (basesink)));
-        }
-      } else if (!basesink->have_preroll) {
-        /* queue a commit_state */
-        basesink->need_preroll = TRUE;
-        GST_DEBUG_OBJECT (basesink,
-            "PAUSED to PLAYING, !eos, !have_preroll, need preroll to TRUE");
-        ret = GST_STATE_CHANGE_ASYNC;
-        /* we know it's not waiting, no need to signal */
-      } else {
-        GST_DEBUG_OBJECT (basesink,
-            "PAUSED to PLAYING, !eos, have_preroll, need preroll to FALSE");
-        /* now let it play */
-        GST_PAD_PREROLL_SIGNAL (basesink->sinkpad);
-      }
-      GST_PAD_PREROLL_UNLOCK (basesink->sinkpad);
-      break;
-    default:
-      break;
-  }
-
-  {
-    GstStateChangeReturn bret;
-
-    bret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
-    if (bret == GST_STATE_CHANGE_FAILURE)
-      goto activate_failed;
-  }
-
-  switch (transition) {
-    case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
-    {
-      GstBaseSinkClass *bclass;
-
-      bclass = GST_BASE_SINK_GET_CLASS (basesink);
-
-      GST_PAD_PREROLL_LOCK (basesink->sinkpad);
-      GST_OBJECT_LOCK (basesink);
-      /* unlock clock wait if any */
-      if (basesink->clock_id) {
-        gst_clock_id_unschedule (basesink->clock_id);
-      }
-      GST_OBJECT_UNLOCK (basesink);
-
-      /* unlock any subclasses */
-      if (bclass->unlock)
-        bclass->unlock (basesink);
-
-      /* if we don't have a preroll buffer and we have not received EOS,
-       * we need to wait for a preroll */
-      GST_DEBUG_OBJECT (basesink, "have_preroll: %d, EOS: %d",
-          basesink->have_preroll, basesink->eos);
-      if (!basesink->have_preroll && !basesink->eos
-          && GST_STATE_PENDING (basesink) == GST_STATE_PAUSED) {
-        GST_DEBUG_OBJECT (basesink, "PLAYING to PAUSED, need preroll to TRUE");
-        basesink->need_preroll = TRUE;
-        ret = GST_STATE_CHANGE_ASYNC;
-      }
-      GST_PAD_PREROLL_UNLOCK (basesink->sinkpad);
-      break;
-    }
-    case GST_STATE_CHANGE_PAUSED_TO_READY:
-      break;
-    case GST_STATE_CHANGE_READY_TO_NULL:
-      if (bclass->stop)
-        if (!bclass->stop (basesink)) {
-          GST_WARNING ("failed to stop");
-        }
-      break;
-    default:
-      break;
-  }
-
-  return ret;
-
-  /* ERRORS */
-start_failed:
-  {
-    GST_DEBUG_OBJECT (basesink, "failed to start");
-    return GST_STATE_CHANGE_FAILURE;
-  }
-activate_failed:
-  {
-    GST_DEBUG_OBJECT (basesink,
-        "element failed to change states -- activation problem?");
-    return GST_STATE_CHANGE_FAILURE;
-  }
-}