Band-split the HRIRs when building the ambisonic decoder filters

This allows each HRIR to contribute a frequency-dependent response, essentially
acting like a dual-band decoder playing over the cube speaker array.

1 files changed, 10 insertions, 10 deletions

diff --git a/Alc/bformatdec.c b/Alc/bformatdec.c
index 3c175b33..356423ce 100644
--- a/Alc/bformatdec.c
+++ b/Alc/bformatdec.c
@@ -10,14 +10,7 @@
 #include "almalloc.h"
 
 
-typedef struct BandSplitter {
-    ALfloat coeff;
-    ALfloat lp_z1;
-    ALfloat lp_z2;
-    ALfloat hp_z1;
-} BandSplitter;
-
-static void bandsplit_init(BandSplitter *splitter, ALfloat freq_mult)
+void bandsplit_init(BandSplitter *splitter, ALfloat freq_mult)
 {
     ALfloat w = freq_mult * F_TAU;
     ALfloat cw = cosf(w);
@@ -31,8 +24,15 @@ static void bandsplit_init(BandSplitter *splitter, ALfloat freq_mult)
     splitter->hp_z1 = 0.0f;
 }
 
-static void bandsplit_process(BandSplitter *splitter, ALfloat *restrict hpout, ALfloat *restrict lpout,
-                              const ALfloat *input, ALuint count)
+void bandsplit_clear(BandSplitter *splitter)
+{
+    splitter->lp_z1 = 0.0f;
+    splitter->lp_z2 = 0.0f;
+    splitter->hp_z1 = 0.0f;
+}
+
+void bandsplit_process(BandSplitter *splitter, ALfloat *restrict hpout, ALfloat *restrict lpout,
+                       const ALfloat *input, ALuint count)
 {
     ALfloat coeff, d, x;
     ALfloat z1, z2;