From 212b187447c6b095de3629448d3a2270c09cf119 Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Sat, 25 Jun 2011 21:39:36 -0700
Subject: Add a function to check if a device is compatible with the Hrtf
 filter

---
 Alc/ALc.c                 | 3 +--
 Alc/hrtf.c                | 8 ++++++++
 OpenAL32/Include/alMain.h | 1 +
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/Alc/ALc.c b/Alc/ALc.c
index b84aa6e0..f95a2ac7 100644
--- a/Alc/ALc.c
+++ b/Alc/ALc.c
@@ -1335,8 +1335,7 @@ static ALCboolean UpdateDeviceParams(ALCdevice *device, const ALCint *attrList)
 
     if(!device->IsLoopbackDevice && GetConfigValueBool(NULL, "hrtf", AL_FALSE))
         device->Flags |= DEVICE_USE_HRTF;
-    if((device->FmtChans != DevFmtStereo || device->Frequency != 44100) &&
-       (device->Flags&DEVICE_USE_HRTF))
+    if((device->Flags&DEVICE_USE_HRTF) && !IsHrtfCompatible(device))
     {
         AL_PRINT("HRTF disabled (format is %uhz %s)\n", device->Frequency, DevFmtChannelsString(device->FmtChans));
         device->Flags &= ~DEVICE_USE_HRTF;
diff --git a/Alc/hrtf.c b/Alc/hrtf.c
index 43cfb80b..801e26b9 100644
--- a/Alc/hrtf.c
+++ b/Alc/hrtf.c
@@ -27,6 +27,7 @@
 
 #define HRIR_COUNT 828
 
+static const ALuint sampleRate = 44100;
 static const ALubyte evCount = 19;
 static const ALushort evOffset[19] = { 0, 1, 13, 37, 73, 118, 174, 234, 306, 378, 450, 522, 594, 654, 710, 755, 791, 815, 827 };
 static const ALubyte azCount[19] = { 1, 12, 24, 36, 45, 56, 60, 72, 72, 72, 72, 72, 60, 56, 45, 36, 24, 12, 1 };
@@ -68,6 +69,13 @@ void GetHrtfCoeffs(ALfloat elevation, ALfloat angle, const ALshort **left, const
     *right = Hrtf.coeffs[ridx];
 }
 
+ALCboolean IsHrtfCompatible(ALCdevice *device)
+{
+    if(device->FmtChans == DevFmtStereo && device->Frequency == sampleRate)
+        return ALC_TRUE;
+    return ALC_FALSE;
+}
+
 void InitHrtf(void)
 {
     const char *str;
diff --git a/OpenAL32/Include/alMain.h b/OpenAL32/Include/alMain.h
index 0c95177f..3264d5ed 100644
--- a/OpenAL32/Include/alMain.h
+++ b/OpenAL32/Include/alMain.h
@@ -502,6 +502,7 @@ ALboolean IsValidChannels(ALenum type);
 #define HRIR_LENGTH      (1<<HRIR_BITS)
 #define HRIR_MASK        (HRIR_LENGTH-1)
 void InitHrtf(void);
+ALCboolean IsHrtfCompatible(ALCdevice *device);
 void GetHrtfCoeffs(ALfloat elevation, ALfloat angle, const ALshort **left, const ALshort **right, ALuint *ldelay, ALuint *rdelay);
 
 void al_print(const char *fname, unsigned int line, const char *fmt, ...)
-- 
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