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bin: Use the new group-id field of the stream-start message for stream-start message aggregation

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If all stream-start messages had a group id (for backwards compatibility),
we only consider a stream started if all had the same group id.

In 2.0 we should make the group id mandatory.
This commit is contained in:
Sebastian Dröge 2013-07-22 11:42:18 +02:00
parent 75d9454bf4
commit 7c936a4cc2
1 changed files with 32 additions and 4 deletions
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36
gst/gstbin.c
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@ -1011,12 +1011,16 @@ is_eos (GstBin * bin, guint32 * seqnum)
*
* call with bin LOCK */
static gboolean
is_stream_start (GstBin * bin, guint32 * seqnum)
is_stream_start (GstBin * bin, guint32 * seqnum, gboolean * have_group_id,
guint * group_id)
{
gboolean result;
gint n_stream_start = 0;
GList *walk, *msgs;
guint tmp_group_id;
gboolean first = TRUE, same_group_id = TRUE;
*have_group_id = TRUE;
*group_id = 0;
result = TRUE;
for (walk = bin->children; walk; walk = g_list_next (walk)) {
GstElement *element;
@ -1029,7 +1033,18 @@ is_stream_start (GstBin * bin, guint32 * seqnum)
GST_MESSAGE_STREAM_START))) {
GST_DEBUG ("sink '%s' posted STREAM_START", GST_ELEMENT_NAME (element));
*seqnum = gst_message_get_seqnum (GST_MESSAGE_CAST (msgs->data));
n_stream_start++;
if (gst_message_parse_group_id (GST_MESSAGE_CAST (msgs->data),
&tmp_group_id)) {
if (first) {
first = FALSE;
*group_id = tmp_group_id;
} else {
if (tmp_group_id != *group_id)
same_group_id = FALSE;
}
} else {
*have_group_id = FALSE;
}
} else {
GST_DEBUG ("sink '%s' did not post STREAM_START yet",
GST_ELEMENT_NAME (element));
@ -1039,6 +1054,14 @@ is_stream_start (GstBin * bin, guint32 * seqnum)
}
}
/* If all have a group_id we only consider this stream started
* if all group ids were the same and all sinks posted a stream-start
* message */
if (*have_group_id)
return same_group_id && result;
/* otherwise consider this stream started after all sinks
* have reported stream-start for backward compatibility.
* FIXME 2.0: This should go away! */
return result;
}
@ -3195,12 +3218,14 @@ bin_do_stream_start (GstBin * bin)
{
guint32 seqnum = 0;
gboolean stream_start;
gboolean have_group_id = FALSE;
guint group_id = 0;
GST_OBJECT_LOCK (bin);
/* If all sinks are STREAM_START we forward the STREAM_START message
* to the parent bin or application
*/
stream_start = is_stream_start (bin, &seqnum);
stream_start = is_stream_start (bin, &seqnum, &have_group_id, &group_id);
GST_OBJECT_UNLOCK (bin);
if (stream_start) {
@ -3212,6 +3237,9 @@ bin_do_stream_start (GstBin * bin)
tmessage = gst_message_new_stream_start (GST_OBJECT_CAST (bin));
gst_message_set_seqnum (tmessage, seqnum);
if (have_group_id)
gst_message_set_group_id (tmessage, group_id);
GST_DEBUG_OBJECT (bin,
"all sinks posted STREAM_START, posting seqnum #%" G_GUINT32_FORMAT,
seqnum);