1 files changed, 37 insertions, 0 deletions
diff --git a/alc/mixer/defs.h b/alc/mixer/defs.h
index f8bdf428..299830a8 100644
--- a/alc/mixer/defs.h
+++ b/alc/mixer/defs.h
@@ -26,6 +26,43 @@ constexpr int MixerFracMask{MixerFracOne - 1};
 constexpr int MaxResamplerPadding{48};
 
 
+enum class Resampler {
+    Point,
+    Linear,
+    Cubic,
+    FastBSinc12,
+    BSinc12,
+    FastBSinc24,
+    BSinc24,
+
+    Max = BSinc24
+};
+
+/* Interpolator state. Kind of a misnomer since the interpolator itself is
+ * stateless. This just keeps it from having to recompute scale-related
+ * mappings for every sample.
+ */
+struct BsincState {
+    float sf; /* Scale interpolation factor. */
+    uint m; /* Coefficient count. */
+    uint l; /* Left coefficient offset. */
+    /* Filter coefficients, followed by the phase, scale, and scale-phase
+     * delta coefficients. Starting at phase index 0, each subsequent phase
+     * index follows contiguously.
+     */
+    const float *filter;
+};
+
+union InterpState {
+    BsincState bsinc;
+};
+
+using ResamplerFunc = const float*(*)(const InterpState *state, const float *RESTRICT src,
+    uint frac, uint increment, const al::span<float> dst);
+
+ResamplerFunc PrepareResampler(Resampler resampler, uint increment, InterpState *state);
+
+
 template<typename TypeTag, typename InstTag>
 const float *Resample_(const InterpState *state, const float *RESTRICT src, uint frac,
     uint increment, const al::span<float> dst);