[xiph-commits] r18220 - trunk/postfish

[xiphmont at svn.xiph.org]

Author: xiphmont
Date: 2012-03-02 21:00:42 -0800 (Fri, 02 Mar 2012)
New Revision: 18220

Modified:
   trunk/postfish/output.c
   trunk/postfish/version.h
Log:
Had a rounding bug in the < 24 bit output; caused a DC offset at very 
low levels


Modified: trunk/postfish/output.c
===================================================================
--- trunk/postfish/output.c	2012-03-02 23:38:12 UTC (rev 18219)
+++ trunk/postfish/output.c	2012-03-03 05:00:42 UTC (rev 18220)
@@ -610,9 +610,20 @@
   int bytes=(bits+7)>>3;
   int32_t signxor=(signp?0:0x800000L);
   int bytestep=bytes*(ch-1);
+  int round=0;
 
   int endbytecase=endian*3+(bytes-1);
   int j,i;
+
+  switch(endbytecase){
+  case 1:case 4:
+    round=128;
+    break;
+  case 0:case 3:
+    round=32768;
+    break;
+  }
+
   for(j=0;j<ch;j++){
     unsigned char *o=audiobuf+bytes*j;
     if(!mute_channel_muted(link->active,j) && source[j]){
@@ -621,7 +632,7 @@
 
       for(i=0;i<link->samples;i++){
 	float dval=d[i];
-	int32_t val=rint(dval*8388608.);
+	int32_t val=rint(dval*8388608.)+round;
 	if(val>8388607)val=8388607;
 	if(val<-8388608)val=-8388608;
 	val ^= signxor;

Modified: trunk/postfish/version.h
===================================================================
--- trunk/postfish/version.h	2012-03-02 23:38:12 UTC (rev 18219)
+++ trunk/postfish/version.h	2012-03-03 05:00:42 UTC (rev 18220)
@@ -1,2 +1,2 @@
 #define VERSION "$Id$ "
-/* DO NOT EDIT: Automated versioning hack [Sat Aug 21 01:08:29 EDT 2010] */
+/* DO NOT EDIT: Automated versioning hack [Fri Mar  2 23:59:38 EST 2012] */