r4071 - trunk/bse

[stw svn gnome org]

Author: stw
Date: 2006-11-08 17:44:30 -0500 (Wed, 08 Nov 2006)
New Revision: 4071

Modified:
   trunk/bse/ChangeLog
   trunk/bse/bseresampler.cc
   trunk/bse/bseresampler.hh
   trunk/bse/bseresamplerimpl.hh
Log:
Wed Nov  8 23:28:05 2006  Stefan Westerfeld  <stefan space twc de>

	* bseresampler.[hc]* bseresamplerimpl.hh: Added coefficient set for
	linear interpolation. It will probably sound bad, but its useful for
	testing.


Modified: trunk/bse/ChangeLog
===================================================================
--- trunk/bse/ChangeLog	2006-11-08 21:23:13 UTC (rev 4070)
+++ trunk/bse/ChangeLog	2006-11-08 22:44:30 UTC (rev 4071)
@@ -1,3 +1,9 @@
+Wed Nov  8 23:28:05 2006  Stefan Westerfeld  <stefan space twc de>
+
+	* bseresampler.[hc]* bseresamplerimpl.hh: Added coefficient set for
+	linear interpolation. It will probably sound bad, but its useful for
+	testing.
+
 Sun Nov  5 04:23:07 2006  Tim Janik  <timj gtk org>
 
 	* tests/filtertest.cc (random_filter_tests): extended fixed orders to 32 

Modified: trunk/bse/bseresampler.cc
===================================================================
--- trunk/bse/bseresampler.cc	2006-11-08 21:23:13 UTC (rev 4070)
+++ trunk/bse/bseresampler.cc	2006-11-08 22:44:30 UTC (rev 4071)
@@ -264,6 +264,16 @@
   -1.841826652067372e-07,
 };
 
+/* linear interpolation coefficients; barely useful for actual audio use,
+ * but useful for testing
+ */
+const double Resampler2::halfband_fir_linear_coeffs[2] = {
+  0.25,
+  /* here, a 0.5 coefficient will be used */
+  0.25,
+};
+
+
 } // Resampler
 } // Bse
 

Modified: trunk/bse/bseresampler.hh
===================================================================
--- trunk/bse/bseresampler.hh	2006-11-08 21:23:13 UTC (rev 4070)
+++ trunk/bse/bseresampler.hh	2006-11-08 22:44:30 UTC (rev 4071)
@@ -33,6 +33,7 @@
 
 typedef enum /*< skip >*/
 {
+  BSE_RESAMPLER2_PREC_LINEAR = 1,     /* linear interpolation */
   BSE_RESAMPLER2_PREC_48DB = 8,
   BSE_RESAMPLER2_PREC_72DB = 12,
   BSE_RESAMPLER2_PREC_96DB = 16,
@@ -94,6 +95,7 @@
    */
   virtual double      delay() const = 0;
 protected:
+  static const double halfband_fir_linear_coeffs[2];
   static const double halfband_fir_48db_coeffs[16];
   static const double halfband_fir_72db_coeffs[24];
   static const double halfband_fir_96db_coeffs[32];

Modified: trunk/bse/bseresamplerimpl.hh
===================================================================
--- trunk/bse/bseresamplerimpl.hh	2006-11-08 21:23:13 UTC (rev 4070)
+++ trunk/bse/bseresamplerimpl.hh	2006-11-08 22:44:30 UTC (rev 4071)
@@ -589,6 +589,7 @@
     {
       switch (precision)
 	{
+	case BSE_RESAMPLER2_PREC_LINEAR: return create_impl_with_coeffs <Upsampler2<2, USE_SSE> > (halfband_fir_linear_coeffs, 2, 2.0);
 	case BSE_RESAMPLER2_PREC_48DB:   return create_impl_with_coeffs <Upsampler2<16, USE_SSE> > (halfband_fir_48db_coeffs, 16, 2.0);
 	case BSE_RESAMPLER2_PREC_72DB:   return create_impl_with_coeffs <Upsampler2<24, USE_SSE> > (halfband_fir_72db_coeffs, 24, 2.0);
 	case BSE_RESAMPLER2_PREC_96DB:   return create_impl_with_coeffs <Upsampler2<32, USE_SSE> > (halfband_fir_96db_coeffs, 32, 2.0);
@@ -600,6 +601,7 @@
     {
       switch (precision)
 	{
+	case BSE_RESAMPLER2_PREC_LINEAR: return create_impl_with_coeffs <Downsampler2<2, USE_SSE> > (halfband_fir_linear_coeffs, 2, 1.0);
 	case BSE_RESAMPLER2_PREC_48DB:   return create_impl_with_coeffs <Downsampler2<16, USE_SSE> > (halfband_fir_48db_coeffs, 16, 1.0);
 	case BSE_RESAMPLER2_PREC_72DB:   return create_impl_with_coeffs <Downsampler2<24, USE_SSE> > (halfband_fir_72db_coeffs, 24, 1.0);
 	case BSE_RESAMPLER2_PREC_96DB:   return create_impl_with_coeffs <Downsampler2<32, USE_SSE> > (halfband_fir_96db_coeffs, 32, 1.0);