ladspa-bs2b-0.9.1.patch

diff -u -ru ladspa-bs2b-0.9.1.orig/src/plugin.c ladspa-bs2b-0.9.1/src/plugin.c
--- ladspa-bs2b-0.9.1.orig/src/plugin.c	2009-06-05 03:44:25.000000000 +0900
+++ ladspa-bs2b-0.9.1/src/plugin.c	2016-04-01 15:28:18.282931019 +0900
@@ -89,13 +89,13 @@
 LADSPA_Handle
 instantiateBs2bLine(const LADSPA_Descriptor * Descriptor,
 		unsigned long SampleRate) {
-	Bs2bLine * psBs2bLine = (Bs2bLine *)malloc(sizeof(Bs2bLine));
-	if (psBs2bLine == NULL) {
+	/* Sample rate supported? */
+	if ((SampleRate < BS2B_MINSRATE) || (SampleRate > BS2B_MAXSRATE)) {
 		return NULL;
 	}
 
-	/* Sample rate supported? */
-	if ((SampleRate < BS2B_MINSRATE) || (SampleRate > BS2B_MAXSRATE)) {
+	Bs2bLine * psBs2bLine = (Bs2bLine *)malloc(sizeof(Bs2bLine));
+	if (psBs2bLine == NULL) {
 		return NULL;
 	}
 
@@ -178,6 +178,25 @@
 	pfOutputLeft = psBs2bLine->m_pfOutputLeft;
 	pfOutputRight = psBs2bLine->m_pfOutputRight;
 
+	/* bs2b_cross_feed_f increase cpu usage while all 0 inputs. 
+	   First time (before using the plugin) does not increase cpus.
+	   But once used, the cpu usage was up.
+	   Below codes simply skip for avoiding this situations. 
+	   I couldn't find other way for fix this. */
+
+	for (lSampleIndex = 0; lSampleIndex < SampleCount; lSampleIndex++) {
+		if (pfInputLeft[lSampleIndex] != 0 || pfInputRight[lSampleIndex] != 0)
+			break;
+	}
+	
+	if (lSampleIndex == SampleCount) {
+		for (lSampleIndex = 0; lSampleIndex < SampleCount; lSampleIndex++) {
+			pfOutputLeft[lSampleIndex] = 0;
+			pfOutputRight[lSampleIndex] = 0;
+		}
+		return;
+	}
+       
 	/* Re-allocate when needed */
 	if (SampleCount > psBs2bLine->bufferSampleCount) {
 		float * const reallocated