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gstbin: collect and aggregate STREAM_START messages

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when all sinks have posted a STREAM_START, the bin will forward a
new STREAM_START message to the parent bin or application
This commit is contained in:
Edward Hervey 2012-07-09 20:27:44 +02:00
parent 67b77667bb
commit 94bd61b72d
1 changed files with 80 additions and 0 deletions
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80
gst/gstbin.c
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@ -1009,6 +1009,43 @@ is_eos (GstBin * bin, guint32 * seqnum)
return result && n_eos > 0;
}
/* Check if the bin is STREAM_START. We do this by scanning all sinks and
* checking if they posted an STREAM_START message.
*
* call with bin LOCK */
static gboolean
is_stream_start (GstBin * bin, guint32 * seqnum)
{
gboolean result;
gint n_stream_start = 0;
GList *walk, *msgs;
result = TRUE;
for (walk = bin->children; walk; walk = g_list_next (walk)) {
GstElement *element;
element = GST_ELEMENT_CAST (walk->data);
if (bin_element_is_sink (element, bin) == 0) {
/* check if element posted STREAM_START */
if ((msgs =
find_message (bin, GST_OBJECT_CAST (element),
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++;
} else {
GST_DEBUG ("sink '%s' did not post STREAM_START yet",
GST_ELEMENT_NAME (element));
result = FALSE;
break;
}
}
}
return result;
}
static void
unlink_pads (const GValue * item, gpointer user_data)
{
@ -2518,6 +2555,8 @@ gst_bin_change_state_func (GstElement * element, GstStateChange transition)
GST_DEBUG_OBJECT (element, "clearing EOS elements");
bin_remove_messages (bin, NULL, GST_MESSAGE_EOS);
bin->priv->posted_eos = FALSE;
if (current == GST_STATE_READY)
bin_remove_messages (bin, NULL, GST_MESSAGE_STREAM_START);
GST_OBJECT_UNLOCK (bin);
if (current == GST_STATE_READY)
if (!(gst_bin_src_pads_activate (bin, TRUE)))
@ -3126,6 +3165,35 @@ bin_do_eos (GstBin * bin)
}
}
static void
bin_do_stream_start (GstBin * bin)
{
guint32 seqnum = 0;
gboolean stream_start;
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);
GST_OBJECT_UNLOCK (bin);
if (stream_start) {
GstMessage *tmessage;
GST_OBJECT_LOCK (bin);
bin_remove_messages (bin, NULL, GST_MESSAGE_STREAM_START);
GST_OBJECT_UNLOCK (bin);
tmessage = gst_message_new_stream_start (GST_OBJECT_CAST (bin));
gst_message_set_seqnum (tmessage, seqnum);
GST_DEBUG_OBJECT (bin,
"all sinks posted STREAM_START, posting seqnum #%" G_GUINT32_FORMAT,
seqnum);
gst_element_post_message (GST_ELEMENT_CAST (bin), tmessage);
}
}
/* must be called with the object lock. This function releases the lock to post
* the message. */
static void
@ -3245,6 +3313,18 @@ gst_bin_handle_message_func (GstBin * bin, GstMessage * message)
bin_do_eos (bin);
break;
}
case GST_MESSAGE_STREAM_START:
{
/* collect all stream_start messages from the children */
GST_OBJECT_LOCK (bin);
/* ref message for future use */
bin_replace_message (bin, message, GST_MESSAGE_STREAM_START);
GST_OBJECT_UNLOCK (bin);
bin_do_stream_start (bin);
break;
}
case GST_MESSAGE_STATE_DIRTY:
{
GST_WARNING_OBJECT (bin, "received deprecated STATE_DIRTY message");