gst/filter/gstbpwsinc.*: Implement latency query and only forward those samples downstream that actually contain the ...

Original commit message from CVS:
* gst/filter/gstbpwsinc.c: (gst_bpwsinc_class_init),
(gst_bpwsinc_init), (process_32), (process_64),
(bpwsinc_build_kernel), (bpwsinc_push_residue),
(bpwsinc_transform), (bpwsinc_start), (bpwsinc_query),
(bpwsinc_query_type), (bpwsinc_event), (bpwsinc_set_property):
* gst/filter/gstbpwsinc.h:
Implement latency query and only forward those samples downstream
that actually contain the data we want, i.e. drop kernel_length/2
in the beginning and append kernel_length/2 (created by convolving
the filter kernel with zeroes) to the end.
* tests/check/elements/bpwsinc.c: (GST_START_TEST):
Adjust the unit test for this slightly changed behaviour.
* gst/filter/gstlpwsinc.c: (lpwsinc_build_kernel):
Reset residue length only when actually creating a residue.

1 files changed, 3 insertions, 2 deletions

diff --git a/gst/filter/gstlpwsinc.c b/gst/filter/gstlpwsinc.c
index d86aace1..3869553b 100644
--- a/gst/filter/gstlpwsinc.c
+++ b/gst/filter/gstlpwsinc.c
@@ -421,12 +421,13 @@ lpwsinc_build_kernel (GstLPWSinc * self)
   }
 
   /* set up the residue memory space */
-  if (!self->residue)
+  if (!self->residue) {
     self->residue =
         g_new0 (gdouble, len * GST_AUDIO_FILTER (self)->format.channels);
+    self->residue_length = 0;
+  }
 
   self->have_kernel = TRUE;
-  self->residue_length = 0;
 }
 
 static void