Add a special resampler for matching sample rates

Alc/ALu.c

@@ -54,7 +54,7 @@ ALfloat ZScale = 1.0f;
 static ResamplerFunc SelectResampler(enum Resampler Resampler, ALuint increment)
 {
     if(increment == FRACTIONONE)
-        return Resample_point32_C;
+        return Resample_copy32_C;
     switch(Resampler)
     {
         case PointResampler:

Alc/mixer.c

@@ -116,7 +116,7 @@ ALvoid MixSource(ALsource *Source, ALCdevice *Device, ALuint SamplesToDo)
     DataPosFrac   = Source->position_fraction;
     Looping       = Source->Looping;
     increment     = Source->Params.Step;
-    Resampler     = Source->Resampler;
+    Resampler     = (increment==FRACTIONONE) ? PointResampler : Source->Resampler;
     NumChannels   = Source->NumChannels;
     SampleSize    = Source->SampleSize;
 

Alc/mixer_c.c

@@ -1,5 +1,7 @@
 #include "config.h"
 
+#include <assert.h>
+
 #include "alMain.h"
 #include "alu.h"
 #include "alSource.h"
@@ -13,6 +15,14 @@ static __inline ALfloat lerp32(const ALfloat *vals, ALuint frac)
 static __inline ALfloat cubic32(const ALfloat *vals, ALuint frac)
 { return cubic(vals[-1], vals[0], vals[1], vals[2], frac * (1.0f/FRACTIONONE)); }
 
+void Resample_copy32_C(const ALfloat *data, ALuint frac,
+  ALuint increment, ALfloat *RESTRICT OutBuffer, ALuint BufferSize)
+{
+    (void)frac;
+    assert(increment==FRACTIONONE);
+    memcpy(OutBuffer, data, (BufferSize+1)*sizeof(ALfloat));
+}
+
 #define DECL_TEMPLATE(Sampler)                                                \
 void Resample_##Sampler##_C(const ALfloat *data, ALuint frac,                 \
   ALuint increment, ALfloat *RESTRICT OutBuffer, ALuint BufferSize)           \

Alc/mixer_defs.h

@@ -10,6 +10,7 @@ struct DirectParams;
 struct SendParams;
 
 /* C resamplers */
+void Resample_copy32_C(const ALfloat *src, ALuint frac, ALuint increment, ALfloat *RESTRICT dst, ALuint dstlen);
 void Resample_point32_C(const ALfloat *src, ALuint frac, ALuint increment, ALfloat *RESTRICT dst, ALuint dstlen);
 void Resample_lerp32_C(const ALfloat *src, ALuint frac, ALuint increment, ALfloat *RESTRICT dst, ALuint dstlen);
 void Resample_cubic32_C(const ALfloat *src, ALuint frac, ALuint increment, ALfloat *RESTRICT dst, ALuint dstlen);