echo-cancel: Skip processing till there's enough data

This makes sure that we only perform any processing (resync or actual
cancellation) after the source provides enough data to actuall run the
canceller.

diff --git a/src/modules/echo-cancel/module-echo-cancel.c b/src/modules/echo-cancel/module-echo-cancel.c
index 8d77a3b..77c8ff8 100644 (file)
--- a/src/modules/echo-cancel/module-echo-cancel.c
+++ b/src/modules/echo-cancel/module-echo-cancel.c
@@ -665,15 +665,19 @@ static void source_output_push_cb(pa_source_output *o, const pa_memchunk *chunk)
     while (pa_asyncmsgq_process_one(u->asyncmsgq) > 0)
         ;
 
-    if (pa_atomic_cmpxchg (&u->request_resync, 1, 0)) {
-        do_resync(u);
-    }
-
     pa_memblockq_push_align(u->source_memblockq, chunk);
 
     rlen = pa_memblockq_get_length(u->source_memblockq);
     plen = pa_memblockq_get_length(u->sink_memblockq);
 
+    /* Let's not do anything else till we have enough data to process */
+    if (rlen < u->blocksize)
+        return;
+
+    if (pa_atomic_cmpxchg (&u->request_resync, 1, 0)) {
+        do_resync(u);
+    }
+
     while (rlen >= u->blocksize) {
         pa_memchunk rchunk, pchunk;