collectpads: don't keep buffers reffed longer than needed

Make sure we take ownership of the buffer early without increasing its refcount
when we go in the collect function. This reduces the amount of copies needed in
order to make the buffer writable in most cases.

diff --git a/libs/gst/base/gstcollectpads.c b/libs/gst/base/gstcollectpads.c
index 411fb66..f9aa116 100644 (file)
--- a/libs/gst/base/gstcollectpads.c
+++ b/libs/gst/base/gstcollectpads.c
@@ -1307,7 +1307,6 @@ gst_collect_pads_chain (GstPad * pad, GstBuffer * buffer)
   GstCollectPads *pads;
   GstCollectPadsPrivate *priv;
   GstFlowReturn ret;
-  GstBuffer **buffer_p;
 
   GST_DEBUG ("Got buffer for pad %s:%s", GST_DEBUG_PAD_NAME (pad));
 
@@ -1346,12 +1345,15 @@ gst_collect_pads_chain (GstPad * pad, GstBuffer * buffer)
 
   /* One more pad has data queued */
   pads->queuedpads++;
-  buffer_p = &data->buffer;
-  gst_buffer_replace (buffer_p, buffer);
+  /* take ownership of the buffer */
+  if (data->buffer)
+    gst_buffer_unref (data->buffer);
+  data->buffer = buffer;
+  buffer = NULL;
 
   /* update segment last position if in TIME */
   if (G_LIKELY (data->segment.format == GST_FORMAT_TIME)) {
-    GstClockTime timestamp = GST_BUFFER_TIMESTAMP (buffer);
+    GstClockTime timestamp = GST_BUFFER_TIMESTAMP (data->buffer);
 
     if (GST_CLOCK_TIME_IS_VALID (timestamp))
       gst_segment_set_last_stop (&data->segment, GST_FORMAT_TIME, timestamp);
@@ -1405,7 +1407,8 @@ unlock_done:
   GST_DEBUG ("Pad %s:%s done", GST_DEBUG_PAD_NAME (pad));
   GST_OBJECT_UNLOCK (pads);
   unref_data (data);
-  gst_buffer_unref (buffer);
+  if (buffer)
+    gst_buffer_unref (buffer);
   return ret;
 
 pad_removed:
@@ -1448,9 +1451,8 @@ unexpected:
 clipped:
   {
     GST_DEBUG ("clipped buffer on pad %s:%s", GST_DEBUG_PAD_NAME (pad));
-    GST_OBJECT_UNLOCK (pads);
-    unref_data (data);
-    return GST_FLOW_OK;
+    ret = GST_FLOW_OK;
+    goto unlock_done;
   }
 error:
   {