add NEON optimization

1 files changed, 13 insertions, 0 deletions

diff --git a/libopna/opnassg-sinc-c.c b/libopna/opnassg-sinc-c.c
new file mode 100644
index 0000000..bf93039
--- /dev/null
+++ b/libopna/opnassg-sinc-c.c
@@ -0,0 +1,13 @@
+#include "libopna/opnassg.h"
+
+void opna_ssg_sinc_calc_c(unsigned resampler_index, const int16_t *inbuf, int32_t *outbuf) {
+  for (int c = 0; c < 3; c++) {
+    int32_t chsample = 0;
+    for (int j = 0; j < OPNA_SSG_SINCTABLELEN; j++) {
+      unsigned sincindex = j;
+      if (!(resampler_index&1)) sincindex += OPNA_SSG_SINCTABLELEN;
+      chsample += inbuf[(((resampler_index)>>1)+j)*3+c] * opna_ssg_sinctable[sincindex];
+    }
+    outbuf[c] = chsample;
+  }
+}