/**
* gst_event_set_seqnum:
* @event: A #GstEvent.
* @seqnum: A sequence number.
*
* Set the sequence number of a event.
*
* This function might be called by the creator of a event to indicate that the
* event relates to other events or messages. See gst_event_get_seqnum() for
* more information.
*
* MT safe.
*/
void
gst_event_set_seqnum (GstEvent * event, guint32 seqnum)
{
g_return_if_fail (GST_IS_EVENT (event));
GST_EVENT_SEQNUM (event) = seqnum;
}
/**
* gst_event_get_seqnum:
* @event: A #GstEvent.
*
* Retrieve the sequence number of a event.
*
* Events have ever-incrementing sequence numbers, which may also be set
* explicitly via gst_event_set_seqnum(). Sequence numbers are typically used to
* indicate that a event corresponds to some other set of events or messages,
* for example an EOS event corresponding to a SEEK event. It is considered good
* practice to make this correspondence when possible, though it is not
* required.
*
* Note that events and messages share the same sequence number incrementor;
* two events or messages will never have the same sequence number unless
* that correspondence was made explicitly.
*
* Returns: The event's sequence number.
*
* MT safe.
*/
guint32
gst_event_get_seqnum (GstEvent * event)
{
g_return_val_if_fail (GST_IS_EVENT (event), -1);
return GST_EVENT_SEQNUM (event);
}
static void
gst_event_init (GstEventImpl * event, GstEventType type)
{
gst_mini_object_init (GST_MINI_OBJECT_CAST (event), 0, _gst_event_type,
(GstMiniObjectCopyFunction) _gst_event_copy, NULL,
(GstMiniObjectFreeFunction) _gst_event_free);
GST_EVENT_TYPE (event) = type;
GST_EVENT_TIMESTAMP (event) = GST_CLOCK_TIME_NONE;
GST_EVENT_SEQNUM (event) = gst_util_seqnum_next ();
}
static GstEvent *
_gst_event_copy (GstEvent * event)
{
GstEvent *copy;
copy = (GstEvent *) gst_mini_object_new (GST_TYPE_EVENT);
GST_EVENT_TYPE (copy) = GST_EVENT_TYPE (event);
GST_EVENT_TIMESTAMP (copy) = GST_EVENT_TIMESTAMP (event);
GST_EVENT_SEQNUM (copy) = GST_EVENT_SEQNUM (event);
if (GST_EVENT_SRC (event)) {
GST_EVENT_SRC (copy) = gst_object_ref (GST_EVENT_SRC (event));
}
if (event->structure) {
copy->structure = gst_structure_copy (event->structure);
gst_structure_set_parent_refcount (copy->structure,
©->mini_object.refcount);
}
return copy;
}
static GstPadProbeReturn
sinkpad_event_probe (GstPad * sinkpad, GstEvent * event,
CollectStructure * collect)
{
Segment *segment;
GST_DEBUG_OBJECT (sinkpad, "event:%p (%s seqnum:%d) , collect:%p", event,
GST_EVENT_TYPE_NAME (event), GST_EVENT_SEQNUM (event), collect);
if (GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT) {
fail_if (collect->expected_segments == NULL,
"Received unexpected segment on pad: %s:%s",
GST_DEBUG_PAD_NAME (sinkpad));
if (!collect->gotsegment)
collect->seen_segments =
g_list_append (NULL, GINT_TO_POINTER (GST_EVENT_SEQNUM (event)));
else {
fail_if (g_list_find (collect->seen_segments,
GINT_TO_POINTER (GST_EVENT_SEQNUM (event))),
"Got a segment event we already saw before !");
collect->seen_segments =
g_list_append (collect->seen_segments,
GINT_TO_POINTER (GST_EVENT_SEQNUM (event)));
}
segment = (Segment *) collect->expected_segments->data;
if (compare_segments (collect, segment, event) &&
collect->keep_expected_segments == FALSE) {
collect->expected_segments =
g_list_remove (collect->expected_segments, segment);
g_free (segment);
}
collect->gotsegment = TRUE;
}
return GST_PAD_PROBE_OK;
}
static GstEvent *
_gst_event_copy (GstEvent * event)
{
GstEventImpl *copy;
GstStructure *s;
copy = g_slice_new0 (GstEventImpl);
gst_event_init (copy, GST_EVENT_TYPE (event));
GST_EVENT_TIMESTAMP (copy) = GST_EVENT_TIMESTAMP (event);
GST_EVENT_SEQNUM (copy) = GST_EVENT_SEQNUM (event);
s = GST_EVENT_STRUCTURE (event);
if (s) {
GST_EVENT_STRUCTURE (copy) = gst_structure_copy (s);
gst_structure_set_parent_refcount (GST_EVENT_STRUCTURE (copy),
©->event.mini_object.refcount);
} else {
GST_EVENT_STRUCTURE (copy) = NULL;
}
return GST_EVENT_CAST (copy);
}
static GstEvent *
gst_event_new (GstEventType type)
{
GstEvent *event;
event = (GstEvent *) gst_mini_object_new (GST_TYPE_EVENT);
GST_CAT_DEBUG (GST_CAT_EVENT, "creating new event %p %s %d", event,
gst_event_type_get_name (type), type);
event->type = type;
event->src = NULL;
event->structure = NULL;
GST_EVENT_SEQNUM (event) = gst_util_seqnum_next ();
return event;
}
gboolean
mpegts_base_handle_seek_event (MpegTSBase * base, GstPad * pad,
GstEvent * event)
{
MpegTSBaseClass *klass = GST_MPEGTS_BASE_GET_CLASS (base);
GstFlowReturn ret = GST_FLOW_ERROR;
gdouble rate;
gboolean flush;
GstFormat format;
GstSeekFlags flags;
GstSeekType start_type, stop_type;
gint64 start, stop;
GstEvent *flush_event = NULL;
gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
&stop_type, &stop);
if (format != GST_FORMAT_TIME)
return FALSE;
if (GST_EVENT_SEQNUM (event) == base->last_seek_seqnum) {
GST_DEBUG_OBJECT (base, "Skipping already handled seek");
return TRUE;
}
if (base->mode == BASE_MODE_PUSHING) {
/* First try if upstream supports seeking in TIME format */
if (gst_pad_push_event (base->sinkpad, gst_event_ref (event))) {
GST_DEBUG ("upstream handled SEEK event");
return TRUE;
}
/* If the subclass can seek, do that */
if (klass->seek) {
ret = klass->seek (base, event);
if (G_UNLIKELY (ret != GST_FLOW_OK))
GST_WARNING ("seeking failed %s", gst_flow_get_name (ret));
else {
GstEvent *new_seek;
if (GST_CLOCK_TIME_IS_VALID (base->seek_offset)) {
base->mode = BASE_MODE_SEEKING;
new_seek = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
GST_SEEK_TYPE_SET, base->seek_offset, GST_SEEK_TYPE_NONE, -1);
gst_event_set_seqnum (new_seek, GST_EVENT_SEQNUM (event));
if (!gst_pad_push_event (base->sinkpad, new_seek))
ret = GST_FLOW_ERROR;
else
base->last_seek_seqnum = GST_EVENT_SEQNUM (event);
}
base->mode = BASE_MODE_PUSHING;
}
} else {
GST_WARNING ("subclass has no seek implementation");
}
return ret == GST_FLOW_OK;
}
if (!klass->seek) {
GST_WARNING ("subclass has no seek implementation");
return FALSE;
}
if (rate <= 0.0) {
GST_WARNING ("Negative rate not supported");
return FALSE;
}
GST_DEBUG ("seek event, rate: %f start: %" GST_TIME_FORMAT
" stop: %" GST_TIME_FORMAT, rate, GST_TIME_ARGS (start),
GST_TIME_ARGS (stop));
flush = flags & GST_SEEK_FLAG_FLUSH;
/* stop streaming, either by flushing or by pausing the task */
base->mode = BASE_MODE_SEEKING;
if (flush) {
GST_DEBUG_OBJECT (base, "sending flush start");
flush_event = gst_event_new_flush_start ();
gst_event_set_seqnum (flush_event, GST_EVENT_SEQNUM (event));
gst_pad_push_event (base->sinkpad, gst_event_ref (flush_event));
GST_MPEGTS_BASE_GET_CLASS (base)->push_event (base, flush_event);
} else
gst_pad_pause_task (base->sinkpad);
/* wait for streaming to finish */
GST_PAD_STREAM_LOCK (base->sinkpad);
if (flush) {
/* send a FLUSH_STOP for the sinkpad, since we need data for seeking */
GST_DEBUG_OBJECT (base, "sending flush stop");
flush_event = gst_event_new_flush_stop (TRUE);
gst_event_set_seqnum (flush_event, GST_EVENT_SEQNUM (event));
/* ref for it to be reused later */
gst_pad_push_event (base->sinkpad, gst_event_ref (flush_event));
/* And actually flush our pending data but allow to preserve some info
* to perform the seek */
mpegts_base_flush (base, FALSE);
mpegts_packetizer_flush (base->packetizer, FALSE);
}
if (flags & (GST_SEEK_FLAG_SEGMENT)) {
GST_WARNING ("seek flags 0x%x are not supported", (int) flags);
goto done;
}
/* If the subclass can seek, do that */
ret = klass->seek (base, event);
if (G_UNLIKELY (ret != GST_FLOW_OK))
GST_WARNING ("seeking failed %s", gst_flow_get_name (ret));
else
base->last_seek_seqnum = GST_EVENT_SEQNUM (event);
if (flush_event) {
/* if we sent a FLUSH_START, we now send a FLUSH_STOP */
GST_DEBUG_OBJECT (base, "sending flush stop");
GST_MPEGTS_BASE_GET_CLASS (base)->push_event (base, flush_event);
flush_event = NULL;
}
done:
if (flush_event)
gst_event_unref (flush_event);
gst_pad_start_task (base->sinkpad, (GstTaskFunction) mpegts_base_loop, base,
NULL);
GST_PAD_STREAM_UNLOCK (base->sinkpad);
return ret == GST_FLOW_OK;
}
