From a6287fd407b87b0bf983dcf8fc17ac66c0ae7d23 Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Fri, 5 Oct 2012 06:03:19 -0700
Subject: [PATCH] Add a special resampler for matching sample rates

---
 Alc/ALu.c        |  2 +-
 Alc/mixer.c      |  2 +-
 Alc/mixer_c.c    | 10 ++++++++++
 Alc/mixer_defs.h |  1 +
 4 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/Alc/ALu.c b/Alc/ALu.c
index 6d75e20e..8dfe87e5 100644
--- a/Alc/ALu.c
+++ b/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:
diff --git a/Alc/mixer.c b/Alc/mixer.c
index 7671f1b3..5b180f1e 100644
--- a/Alc/mixer.c
+++ b/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;
 
diff --git a/Alc/mixer_c.c b/Alc/mixer_c.c
index b1ffb11b..28eee188 100644
--- a/Alc/mixer_c.c
+++ b/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)           \
diff --git a/Alc/mixer_defs.h b/Alc/mixer_defs.h
index ecbd879a..f2a180fd 100644
--- a/Alc/mixer_defs.h
+++ b/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);
-- 
2.11.4.GIT