Convert panning.c to C++

1 files changed, 1236 insertions, 0 deletions

diff --git a/Alc/panning.cpp b/Alc/panning.cpp
new file mode 100644
index 00000000..b9133ecf
--- /dev/null
+++ b/Alc/panning.cpp
@@ -0,0 +1,1236 @@
+/**
+ * OpenAL cross platform audio library
+ * Copyright (C) 1999-2010 by authors.
+ * This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, write to the
+ *  Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * Or go to http://www.gnu.org/copyleft/lgpl.html
+ */
+
+#include "config.h"
+
+#include <math.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <assert.h>
+
+#include "alMain.h"
+#include "alAuxEffectSlot.h"
+#include "alu.h"
+#include "alconfig.h"
+#include "bool.h"
+#include "ambdec.h"
+#include "bformatdec.h"
+#include "filters/splitter.h"
+#include "uhjfilter.h"
+#include "bs2b.h"
+
+
+static const ALsizei FuMa2ACN[MAX_AMBI_COEFFS] = {
+    0,  /* W */
+    3,  /* X */
+    1,  /* Y */
+    2,  /* Z */
+    6,  /* R */
+    7,  /* S */
+    5,  /* T */
+    8,  /* U */
+    4,  /* V */
+    12, /* K */
+    13, /* L */
+    11, /* M */
+    14, /* N */
+    10, /* O */
+    15, /* P */
+    9,  /* Q */
+};
+static const ALsizei ACN2ACN[MAX_AMBI_COEFFS] = {
+    0,  1,  2,  3,  4,  5,  6,  7,
+    8,  9, 10, 11, 12, 13, 14, 15
+};
+
+
+void CalcAmbiCoeffs(const ALfloat y, const ALfloat z, const ALfloat x, const ALfloat spread,
+                    ALfloat coeffs[MAX_AMBI_COEFFS])
+{
+    /* Zeroth-order */
+    coeffs[0]  = 1.0f; /* ACN 0 = 1 */
+    /* First-order */
+    coeffs[1]  = SQRTF_3 * y; /* ACN 1 = sqrt(3) * Y */
+    coeffs[2]  = SQRTF_3 * z; /* ACN 2 = sqrt(3) * Z */
+    coeffs[3]  = SQRTF_3 * x; /* ACN 3 = sqrt(3) * X */
+    /* Second-order */
+    coeffs[4]  = 3.872983346f * x * y;             /* ACN 4 = sqrt(15) * X * Y */
+    coeffs[5]  = 3.872983346f * y * z;             /* ACN 5 = sqrt(15) * Y * Z */
+    coeffs[6]  = 1.118033989f * (3.0f*z*z - 1.0f); /* ACN 6 = sqrt(5)/2 * (3*Z*Z - 1) */
+    coeffs[7]  = 3.872983346f * x * z;             /* ACN 7 = sqrt(15) * X * Z */
+    coeffs[8]  = 1.936491673f * (x*x - y*y);       /* ACN 8 = sqrt(15)/2 * (X*X - Y*Y) */
+    /* Third-order */
+    coeffs[9]  =  2.091650066f * y * (3.0f*x*x - y*y);  /* ACN  9 = sqrt(35/8) * Y * (3*X*X - Y*Y) */
+    coeffs[10] = 10.246950766f * z * x * y;             /* ACN 10 = sqrt(105) * Z * X * Y */
+    coeffs[11] =  1.620185175f * y * (5.0f*z*z - 1.0f); /* ACN 11 = sqrt(21/8) * Y * (5*Z*Z - 1) */
+    coeffs[12] =  1.322875656f * z * (5.0f*z*z - 3.0f); /* ACN 12 = sqrt(7)/2 * Z * (5*Z*Z - 3) */
+    coeffs[13] =  1.620185175f * x * (5.0f*z*z - 1.0f); /* ACN 13 = sqrt(21/8) * X * (5*Z*Z - 1) */
+    coeffs[14] =  5.123475383f * z * (x*x - y*y);       /* ACN 14 = sqrt(105)/2 * Z * (X*X - Y*Y) */
+    coeffs[15] =  2.091650066f * x * (x*x - 3.0f*y*y);  /* ACN 15 = sqrt(35/8) * X * (X*X - 3*Y*Y) */
+
+    if(spread > 0.0f)
+    {
+        /* Implement the spread by using a spherical source that subtends the
+         * angle spread. See:
+         * http://www.ppsloan.org/publications/StupidSH36.pdf - Appendix A3
+         *
+         * When adjusted for N3D normalization instead of SN3D, these
+         * calculations are:
+         *
+         * ZH0 = -sqrt(pi) * (-1+ca);
+         * ZH1 =  0.5*sqrt(pi) * sa*sa;
+         * ZH2 = -0.5*sqrt(pi) * ca*(-1+ca)*(ca+1);
+         * ZH3 = -0.125*sqrt(pi) * (-1+ca)*(ca+1)*(5*ca*ca - 1);
+         * ZH4 = -0.125*sqrt(pi) * ca*(-1+ca)*(ca+1)*(7*ca*ca - 3);
+         * ZH5 = -0.0625*sqrt(pi) * (-1+ca)*(ca+1)*(21*ca*ca*ca*ca - 14*ca*ca + 1);
+         *
+         * The gain of the source is compensated for size, so that the
+         * loundness doesn't depend on the spread. Thus:
+         *
+         * ZH0 = 1.0f;
+         * ZH1 = 0.5f * (ca+1.0f);
+         * ZH2 = 0.5f * (ca+1.0f)*ca;
+         * ZH3 = 0.125f * (ca+1.0f)*(5.0f*ca*ca - 1.0f);
+         * ZH4 = 0.125f * (ca+1.0f)*(7.0f*ca*ca - 3.0f)*ca;
+         * ZH5 = 0.0625f * (ca+1.0f)*(21.0f*ca*ca*ca*ca - 14.0f*ca*ca + 1.0f);
+         */
+        ALfloat ca = cosf(spread * 0.5f);
+        /* Increase the source volume by up to +3dB for a full spread. */
+        ALfloat scale = sqrtf(1.0f + spread/F_TAU);
+
+        ALfloat ZH0_norm = scale;
+        ALfloat ZH1_norm = 0.5f * (ca+1.f) * scale;
+        ALfloat ZH2_norm = 0.5f * (ca+1.f)*ca * scale;
+        ALfloat ZH3_norm = 0.125f * (ca+1.f)*(5.f*ca*ca-1.f) * scale;
+
+        /* Zeroth-order */
+        coeffs[0]  *= ZH0_norm;
+        /* First-order */
+        coeffs[1]  *= ZH1_norm;
+        coeffs[2]  *= ZH1_norm;
+        coeffs[3]  *= ZH1_norm;
+        /* Second-order */
+        coeffs[4]  *= ZH2_norm;
+        coeffs[5]  *= ZH2_norm;
+        coeffs[6]  *= ZH2_norm;
+        coeffs[7]  *= ZH2_norm;
+        coeffs[8]  *= ZH2_norm;
+        /* Third-order */
+        coeffs[9]  *= ZH3_norm;
+        coeffs[10] *= ZH3_norm;
+        coeffs[11] *= ZH3_norm;
+        coeffs[12] *= ZH3_norm;
+        coeffs[13] *= ZH3_norm;
+        coeffs[14] *= ZH3_norm;
+        coeffs[15] *= ZH3_norm;
+    }
+}
+
+
+void ComputePanningGainsMC(const ChannelConfig *chancoeffs, ALsizei numchans, ALsizei numcoeffs, const ALfloat*RESTRICT coeffs, ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS])
+{
+    ALsizei i, j;
+
+    for(i = 0;i < numchans;i++)
+    {
+        float gain = 0.0f;
+        for(j = 0;j < numcoeffs;j++)
+            gain += chancoeffs[i][j]*coeffs[j];
+        gains[i] = clampf(gain, 0.0f, 1.0f) * ingain;
+    }
+    for(;i < MAX_OUTPUT_CHANNELS;i++)
+        gains[i] = 0.0f;
+}
+
+void ComputePanningGainsBF(const BFChannelConfig *chanmap, ALsizei numchans, const ALfloat*RESTRICT coeffs, ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS])
+{
+    ALsizei i;
+
+    for(i = 0;i < numchans;i++)
+        gains[i] = chanmap[i].Scale * coeffs[chanmap[i].Index] * ingain;
+    for(;i < MAX_OUTPUT_CHANNELS;i++)
+        gains[i] = 0.0f;
+}
+
+
+static inline const char *GetLabelFromChannel(enum Channel channel)
+{
+    switch(channel)
+    {
+        case FrontLeft: return "front-left";
+        case FrontRight: return "front-right";
+        case FrontCenter: return "front-center";
+        case LFE: return "lfe";
+        case BackLeft: return "back-left";
+        case BackRight: return "back-right";
+        case BackCenter: return "back-center";
+        case SideLeft: return "side-left";
+        case SideRight: return "side-right";
+
+        case UpperFrontLeft: return "upper-front-left";
+        case UpperFrontRight: return "upper-front-right";
+        case UpperBackLeft: return "upper-back-left";
+        case UpperBackRight: return "upper-back-right";
+        case LowerFrontLeft: return "lower-front-left";
+        case LowerFrontRight: return "lower-front-right";
+        case LowerBackLeft: return "lower-back-left";
+        case LowerBackRight: return "lower-back-right";
+
+        case Aux0: return "aux-0";
+        case Aux1: return "aux-1";
+        case Aux2: return "aux-2";
+        case Aux3: return "aux-3";
+        case Aux4: return "aux-4";
+        case Aux5: return "aux-5";
+        case Aux6: return "aux-6";
+        case Aux7: return "aux-7";
+        case Aux8: return "aux-8";
+        case Aux9: return "aux-9";
+        case Aux10: return "aux-10";
+        case Aux11: return "aux-11";
+        case Aux12: return "aux-12";
+        case Aux13: return "aux-13";
+        case Aux14: return "aux-14";
+        case Aux15: return "aux-15";
+
+        case InvalidChannel: break;
+    }
+    return "(unknown)";
+}
+
+
+typedef struct ChannelMap {
+    enum Channel ChanName;
+    ChannelConfig Config;
+} ChannelMap;
+
+static void SetChannelMap(const enum Channel devchans[MAX_OUTPUT_CHANNELS],
+                          ChannelConfig *ambicoeffs, const ChannelMap *chanmap,
+                          ALsizei count, ALsizei *outcount)
+{
+    ALsizei maxchans = 0;
+    ALsizei i, j;
+
+    for(i = 0;i < count;i++)
+    {
+        ALint idx = GetChannelIndex(devchans, chanmap[i].ChanName);
+        if(idx < 0)
+        {
+            ERR("Failed to find %s channel in device\n",
+                GetLabelFromChannel(chanmap[i].ChanName));
+            continue;
+        }
+
+        maxchans = maxi(maxchans, idx+1);
+        for(j = 0;j < MAX_AMBI_COEFFS;j++)
+            ambicoeffs[idx][j] = chanmap[i].Config[j];
+    }
+    *outcount = mini(maxchans, MAX_OUTPUT_CHANNELS);
+}
+
+static bool MakeSpeakerMap(ALCdevice *device, const AmbDecConf *conf, ALsizei speakermap[MAX_OUTPUT_CHANNELS])
+{
+    ALsizei i;
+
+    for(i = 0;i < conf->NumSpeakers;i++)
+    {
+        enum Channel ch;
+        int chidx = -1;
+
+        /* NOTE: AmbDec does not define any standard speaker names, however
+         * for this to work we have to by able to find the output channel
+         * the speaker definition corresponds to. Therefore, OpenAL Soft
+         * requires these channel labels to be recognized:
+         *
+         * LF = Front left
+         * RF = Front right
+         * LS = Side left
+         * RS = Side right
+         * LB = Back left
+         * RB = Back right
+         * CE = Front center
+         * CB = Back center
+         *
+         * Additionally, surround51 will acknowledge back speakers for side
+         * channels, and surround51rear will acknowledge side speakers for
+         * back channels, to avoid issues with an ambdec expecting 5.1 to
+         * use the side channels when the device is configured for back,
+         * and vice-versa.
+         */
+        if(alstr_cmp_cstr(conf->Speakers[i].Name, "LF") == 0)
+            ch = FrontLeft;
+        else if(alstr_cmp_cstr(conf->Speakers[i].Name, "RF") == 0)
+            ch = FrontRight;
+        else if(alstr_cmp_cstr(conf->Speakers[i].Name, "CE") == 0)
+            ch = FrontCenter;
+        else if(alstr_cmp_cstr(conf->Speakers[i].Name, "LS") == 0)
+        {
+            if(device->FmtChans == DevFmtX51Rear)
+                ch = BackLeft;
+            else
+                ch = SideLeft;
+        }
+        else if(alstr_cmp_cstr(conf->Speakers[i].Name, "RS") == 0)
+        {
+            if(device->FmtChans == DevFmtX51Rear)
+                ch = BackRight;
+            else
+                ch = SideRight;
+        }
+        else if(alstr_cmp_cstr(conf->Speakers[i].Name, "LB") == 0)
+        {
+            if(device->FmtChans == DevFmtX51)
+                ch = SideLeft;
+            else
+                ch = BackLeft;
+        }
+        else if(alstr_cmp_cstr(conf->Speakers[i].Name, "RB") == 0)
+        {
+            if(device->FmtChans == DevFmtX51)
+                ch = SideRight;
+            else
+                ch = BackRight;
+        }
+        else if(alstr_cmp_cstr(conf->Speakers[i].Name, "CB") == 0)
+            ch = BackCenter;
+        else
+        {
+            const char *name = alstr_get_cstr(conf->Speakers[i].Name);
+            unsigned int n;
+            char c;
+
+            if(sscanf(name, "AUX%u%c", &n, &c) == 1 && n < 16)
+                ch = static_cast<enum Channel>(Aux0+n);
+            else
+            {
+                ERR("AmbDec speaker label \"%s\" not recognized\n", name);
+                return false;
+            }
+        }
+        chidx = GetChannelIdxByName(&device->RealOut, ch);
+        if(chidx == -1)
+        {
+            ERR("Failed to lookup AmbDec speaker label %s\n",
+                alstr_get_cstr(conf->Speakers[i].Name));
+            return false;
+        }
+        speakermap[i] = chidx;
+    }
+
+    return true;
+}
+
+
+static const ChannelMap MonoCfg[1] = {
+    { FrontCenter, { 1.0f } },
+}, StereoCfg[2] = {
+    { FrontLeft,   { 5.00000000e-1f,  2.88675135e-1f, 0.0f,  5.52305643e-2f } },
+    { FrontRight,  { 5.00000000e-1f, -2.88675135e-1f, 0.0f,  5.52305643e-2f } },
+}, QuadCfg[4] = {
+    { BackLeft,    { 3.53553391e-1f,  2.04124145e-1f, 0.0f, -2.04124145e-1f } },
+    { FrontLeft,   { 3.53553391e-1f,  2.04124145e-1f, 0.0f,  2.04124145e-1f } },
+    { FrontRight,  { 3.53553391e-1f, -2.04124145e-1f, 0.0f,  2.04124145e-1f } },
+    { BackRight,   { 3.53553391e-1f, -2.04124145e-1f, 0.0f, -2.04124145e-1f } },
+}, X51SideCfg[4] = {
+    { SideLeft,    { 3.33000782e-1f,  1.89084803e-1f, 0.0f, -2.00042375e-1f, -2.12307769e-2f, 0.0f, 0.0f, 0.0f, -1.14579885e-2f } },
+    { FrontLeft,   { 1.88542860e-1f,  1.27709292e-1f, 0.0f,  1.66295695e-1f,  7.30571517e-2f, 0.0f, 0.0f, 0.0f,  2.10901184e-2f } },
+    { FrontRight,  { 1.88542860e-1f, -1.27709292e-1f, 0.0f,  1.66295695e-1f, -7.30571517e-2f, 0.0f, 0.0f, 0.0f,  2.10901184e-2f } },
+    { SideRight,   { 3.33000782e-1f, -1.89084803e-1f, 0.0f, -2.00042375e-1f,  2.12307769e-2f, 0.0f, 0.0f, 0.0f, -1.14579885e-2f } },
+}, X51RearCfg[4] = {
+    { BackLeft,    { 3.33000782e-1f,  1.89084803e-1f, 0.0f, -2.00042375e-1f, -2.12307769e-2f, 0.0f, 0.0f, 0.0f, -1.14579885e-2f } },
+    { FrontLeft,   { 1.88542860e-1f,  1.27709292e-1f, 0.0f,  1.66295695e-1f,  7.30571517e-2f, 0.0f, 0.0f, 0.0f,  2.10901184e-2f } },
+    { FrontRight,  { 1.88542860e-1f, -1.27709292e-1f, 0.0f,  1.66295695e-1f, -7.30571517e-2f, 0.0f, 0.0f, 0.0f,  2.10901184e-2f } },
+    { BackRight,   { 3.33000782e-1f, -1.89084803e-1f, 0.0f, -2.00042375e-1f,  2.12307769e-2f, 0.0f, 0.0f, 0.0f, -1.14579885e-2f } },
+}, X61Cfg[6] = {
+    { SideLeft,    { 2.04460341e-1f,  2.17177926e-1f, 0.0f, -4.39996780e-2f, -2.60790269e-2f, 0.0f, 0.0f, 0.0f, -6.87239792e-2f } },
+    { FrontLeft,   { 1.58923161e-1f,  9.21772680e-2f, 0.0f,  1.59658796e-1f,  6.66278083e-2f, 0.0f, 0.0f, 0.0f,  3.84686854e-2f } },
+    { FrontRight,  { 1.58923161e-1f, -9.21772680e-2f, 0.0f,  1.59658796e-1f, -6.66278083e-2f, 0.0f, 0.0f, 0.0f,  3.84686854e-2f } },
+    { SideRight,   { 2.04460341e-1f, -2.17177926e-1f, 0.0f, -4.39996780e-2f,  2.60790269e-2f, 0.0f, 0.0f, 0.0f, -6.87239792e-2f } },
+    { BackCenter,  { 2.50001688e-1f,  0.00000000e+0f, 0.0f, -2.50000094e-1f,  0.00000000e+0f, 0.0f, 0.0f, 0.0f,  6.05133395e-2f } },
+}, X71Cfg[6] = {
+    { BackLeft,    { 2.04124145e-1f,  1.08880247e-1f, 0.0f, -1.88586120e-1f, -1.29099444e-1f, 0.0f, 0.0f, 0.0f,  7.45355993e-2f,  3.73460789e-2f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f,  0.00000000e+0f } },
+    { SideLeft,    { 2.04124145e-1f,  2.17760495e-1f, 0.0f,  0.00000000e+0f,  0.00000000e+0f, 0.0f, 0.0f, 0.0f, -1.49071198e-1f, -3.73460789e-2f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f,  0.00000000e+0f } },
+    { FrontLeft,   { 2.04124145e-1f,  1.08880247e-1f, 0.0f,  1.88586120e-1f,  1.29099444e-1f, 0.0f, 0.0f, 0.0f,  7.45355993e-2f,  3.73460789e-2f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f,  0.00000000e+0f } },
+    { FrontRight,  { 2.04124145e-1f, -1.08880247e-1f, 0.0f,  1.88586120e-1f, -1.29099444e-1f, 0.0f, 0.0f, 0.0f,  7.45355993e-2f, -3.73460789e-2f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f,  0.00000000e+0f } },
+    { SideRight,   { 2.04124145e-1f, -2.17760495e-1f, 0.0f,  0.00000000e+0f,  0.00000000e+0f, 0.0f, 0.0f, 0.0f, -1.49071198e-1f,  3.73460789e-2f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f,  0.00000000e+0f } },
+    { BackRight,   { 2.04124145e-1f, -1.08880247e-1f, 0.0f, -1.88586120e-1f,  1.29099444e-1f, 0.0f, 0.0f, 0.0f,  7.45355993e-2f, -3.73460789e-2f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f,  0.00000000e+0f } },
+};
+
+static void InitNearFieldCtrl(ALCdevice *device, ALfloat ctrl_dist, ALsizei order,
+                              const ALsizei *RESTRICT chans_per_order)
+{
+    const char *devname = alstr_get_cstr(device->DeviceName);
+    ALsizei i;
+
+    if(GetConfigValueBool(devname, "decoder", "nfc", 1) && ctrl_dist > 0.0f)
+    {
+        /* NFC is only used when AvgSpeakerDist is greater than 0, and can only
+         * be used when rendering to an ambisonic buffer.
+         */
+        device->AvgSpeakerDist = minf(ctrl_dist, 10.0f);
+        TRACE("Using near-field reference distance: %.2f meters\n", device->AvgSpeakerDist);
+
+        for(i = 0;i < order+1;i++)
+            device->NumChannelsPerOrder[i] = chans_per_order[i];
+        for(;i < MAX_AMBI_ORDER+1;i++)
+            device->NumChannelsPerOrder[i] = 0;
+    }
+}
+
+static void InitDistanceComp(ALCdevice *device, const AmbDecConf *conf, const ALsizei speakermap[MAX_OUTPUT_CHANNELS])
+{
+    const char *devname = alstr_get_cstr(device->DeviceName);
+    ALfloat maxdist = 0.0f;
+    size_t total = 0;
+    ALsizei i;
+
+    for(i = 0;i < conf->NumSpeakers;i++)
+        maxdist = maxf(maxdist, conf->Speakers[i].Distance);
+
+    if(GetConfigValueBool(devname, "decoder", "distance-comp", 1) && maxdist > 0.0f)
+    {
+        ALfloat srate = (ALfloat)device->Frequency;
+        for(i = 0;i < conf->NumSpeakers;i++)
+        {
+            ALsizei chan = speakermap[i];
+            ALfloat delay;
+
+            /* Distance compensation only delays in steps of the sample rate.
+             * This is a bit less accurate since the delay time falls to the
+             * nearest sample time, but it's far simpler as it doesn't have to
+             * deal with phase offsets. This means at 48khz, for instance, the
+             * distance delay will be in steps of about 7 millimeters.
+             */
+            delay = floorf((maxdist-conf->Speakers[i].Distance) / SPEEDOFSOUNDMETRESPERSEC *
+                           srate + 0.5f);
+            if(delay >= (ALfloat)MAX_DELAY_LENGTH)
+                ERR("Delay for speaker \"%s\" exceeds buffer length (%f >= %u)\n",
+                    alstr_get_cstr(conf->Speakers[i].Name), delay, MAX_DELAY_LENGTH);
+
+            device->ChannelDelay[chan].Length = (ALsizei)clampf(
+                delay, 0.0f, (ALfloat)(MAX_DELAY_LENGTH-1)
+            );
+            device->ChannelDelay[chan].Gain = conf->Speakers[i].Distance / maxdist;
+            TRACE("Channel %u \"%s\" distance compensation: %d samples, %f gain\n", chan,
+                  alstr_get_cstr(conf->Speakers[i].Name), device->ChannelDelay[chan].Length,
+                device->ChannelDelay[chan].Gain
+            );
+
+            /* Round up to the next 4th sample, so each channel buffer starts
+             * 16-byte aligned.
+             */
+            total += RoundUp(device->ChannelDelay[chan].Length, 4);
+        }
+    }
+
+    if(total > 0)
+    {
+        device->ChannelDelay[0].Buffer = reinterpret_cast<float*>(
+            al_calloc(16, total * sizeof(ALfloat)));
+        for(i = 1;i < MAX_OUTPUT_CHANNELS;i++)
+        {
+            size_t len = RoundUp(device->ChannelDelay[i-1].Length, 4);
+            device->ChannelDelay[i].Buffer = device->ChannelDelay[i-1].Buffer + len;
+        }
+    }
+}
+
+static void InitPanning(ALCdevice *device)
+{
+    const ChannelMap *chanmap = NULL;
+    ALsizei coeffcount = 0;
+    ALsizei count = 0;
+    ALsizei i, j;
+
+    switch(device->FmtChans)
+    {
+        case DevFmtMono:
+            count = COUNTOF(MonoCfg);
+            chanmap = MonoCfg;
+            coeffcount = 1;
+            break;
+
+        case DevFmtStereo:
+            count = COUNTOF(StereoCfg);
+            chanmap = StereoCfg;
+            coeffcount = 4;
+            break;
+
+        case DevFmtQuad:
+            count = COUNTOF(QuadCfg);
+            chanmap = QuadCfg;
+            coeffcount = 4;
+            break;
+
+        case DevFmtX51:
+            count = COUNTOF(X51SideCfg);
+            chanmap = X51SideCfg;
+            coeffcount = 9;
+            break;
+
+        case DevFmtX51Rear:
+            count = COUNTOF(X51RearCfg);
+            chanmap = X51RearCfg;
+            coeffcount = 9;
+            break;
+
+        case DevFmtX61:
+            count = COUNTOF(X61Cfg);
+            chanmap = X61Cfg;
+            coeffcount = 9;
+            break;
+
+        case DevFmtX71:
+            count = COUNTOF(X71Cfg);
+            chanmap = X71Cfg;
+            coeffcount = 16;
+            break;
+
+        case DevFmtAmbi3D:
+            break;
+    }
+
+    if(device->FmtChans == DevFmtAmbi3D)
+    {
+        const char *devname = alstr_get_cstr(device->DeviceName);
+        const ALsizei *acnmap = (device->AmbiLayout == AmbiLayout_FuMa) ? FuMa2ACN : ACN2ACN;
+        const ALfloat *n3dscale = (device->AmbiScale == AmbiNorm_FuMa) ? FuMa2N3DScale :
+                                  (device->AmbiScale == AmbiNorm_SN3D) ? SN3D2N3DScale :
+                                  /*(device->AmbiScale == AmbiNorm_N3D) ?*/ N3D2N3DScale;
+        ALfloat nfc_delay = 0.0f;
+
+        count = (device->AmbiOrder == 3) ? 16 :
+                (device->AmbiOrder == 2) ? 9 :
+                (device->AmbiOrder == 1) ? 4 : 1;
+        for(i = 0;i < count;i++)
+        {
+            ALsizei acn = acnmap[i];
+            device->Dry.Ambi.Map[i].Scale = 1.0f/n3dscale[acn];
+            device->Dry.Ambi.Map[i].Index = acn;
+        }
+        device->Dry.CoeffCount = 0;
+        device->Dry.NumChannels = count;
+
+        if(device->AmbiOrder < 2)
+        {
+            device->FOAOut.Ambi = device->Dry.Ambi;
+            device->FOAOut.CoeffCount = device->Dry.CoeffCount;
+            device->FOAOut.NumChannels = 0;
+        }
+        else
+        {
+            ALfloat w_scale=1.0f, xyz_scale=1.0f;
+
+            /* FOA output is always ACN+N3D for higher-order ambisonic output.
+             * The upsampler expects this and will convert it for output.
+             */
+            memset(&device->FOAOut.Ambi, 0, sizeof(device->FOAOut.Ambi));
+            for(i = 0;i < 4;i++)
+            {
+                device->FOAOut.Ambi.Map[i].Scale = 1.0f;
+                device->FOAOut.Ambi.Map[i].Index = i;
+            }
+            device->FOAOut.CoeffCount = 0;
+            device->FOAOut.NumChannels = 4;
+
+            if(device->AmbiOrder >= 3)
+            {
+                w_scale = W_SCALE_3H3P;
+                xyz_scale = XYZ_SCALE_3H3P;
+            }
+            else
+            {
+                w_scale = W_SCALE_2H2P;
+                xyz_scale = XYZ_SCALE_2H2P;
+            }
+            ambiup_reset(device->AmbiUp, device, w_scale, xyz_scale);
+        }
+
+        if(ConfigValueFloat(devname, "decoder", "nfc-ref-delay", &nfc_delay) && nfc_delay > 0.0f)
+        {
+            static const ALsizei chans_per_order[MAX_AMBI_ORDER+1] = {
+                1, 3, 5, 7
+            };
+            nfc_delay = clampf(nfc_delay, 0.001f, 1000.0f);
+            InitNearFieldCtrl(device, nfc_delay * SPEEDOFSOUNDMETRESPERSEC,
+                              device->AmbiOrder, chans_per_order);
+        }
+    }
+    else
+    {
+        ALfloat w_scale, xyz_scale;
+
+        SetChannelMap(device->RealOut.ChannelName, device->Dry.Ambi.Coeffs,
+                      chanmap, count, &device->Dry.NumChannels);
+        device->Dry.CoeffCount = coeffcount;
+
+        w_scale = (device->Dry.CoeffCount > 9) ? W_SCALE_3H0P :
+                  (device->Dry.CoeffCount > 4) ? W_SCALE_2H0P : 1.0f;
+        xyz_scale = (device->Dry.CoeffCount > 9) ? XYZ_SCALE_3H0P :
+                    (device->Dry.CoeffCount > 4) ? XYZ_SCALE_2H0P : 1.0f;
+
+        memset(&device->FOAOut.Ambi, 0, sizeof(device->FOAOut.Ambi));
+        for(i = 0;i < device->Dry.NumChannels;i++)
+        {
+            device->FOAOut.Ambi.Coeffs[i][0] = device->Dry.Ambi.Coeffs[i][0] * w_scale;
+            for(j = 1;j < 4;j++)
+                device->FOAOut.Ambi.Coeffs[i][j] = device->Dry.Ambi.Coeffs[i][j] * xyz_scale;
+        }
+        device->FOAOut.CoeffCount = 4;
+        device->FOAOut.NumChannels = 0;
+    }
+    device->RealOut.NumChannels = 0;
+}
+
+static void InitCustomPanning(ALCdevice *device, const AmbDecConf *conf, const ALsizei speakermap[MAX_OUTPUT_CHANNELS])
+{
+    ChannelMap chanmap[MAX_OUTPUT_CHANNELS];
+    const ALfloat *coeff_scale = N3D2N3DScale;
+    ALfloat w_scale = 1.0f;
+    ALfloat xyz_scale = 1.0f;
+    ALsizei i, j;
+
+    if(conf->FreqBands != 1)
+        ERR("Basic renderer uses the high-frequency matrix as single-band (xover_freq = %.0fhz)\n",
+            conf->XOverFreq);
+
+    if((conf->ChanMask&AMBI_PERIPHONIC_MASK))
+    {
+        if(conf->ChanMask > 0x1ff)
+        {
+            w_scale = W_SCALE_3H3P;
+            xyz_scale = XYZ_SCALE_3H3P;
+        }
+        else if(conf->ChanMask > 0xf)
+        {
+            w_scale = W_SCALE_2H2P;
+            xyz_scale = XYZ_SCALE_2H2P;
+        }
+    }
+    else
+    {
+        if(conf->ChanMask > 0x1ff)
+        {
+            w_scale = W_SCALE_3H0P;
+            xyz_scale = XYZ_SCALE_3H0P;
+        }
+        else if(conf->ChanMask > 0xf)
+        {
+            w_scale = W_SCALE_2H0P;
+            xyz_scale = XYZ_SCALE_2H0P;
+        }
+    }
+
+    if(conf->CoeffScale == ADS_SN3D)
+        coeff_scale = SN3D2N3DScale;
+    else if(conf->CoeffScale == ADS_FuMa)
+        coeff_scale = FuMa2N3DScale;
+
+    for(i = 0;i < conf->NumSpeakers;i++)
+    {
+        ALsizei chan = speakermap[i];
+        ALfloat gain;
+        ALsizei k = 0;
+
+        for(j = 0;j < MAX_AMBI_COEFFS;j++)
+            chanmap[i].Config[j] = 0.0f;
+
+        chanmap[i].ChanName = device->RealOut.ChannelName[chan];
+        for(j = 0;j < MAX_AMBI_COEFFS;j++)
+        {
+            if(j == 0) gain = conf->HFOrderGain[0];
+            else if(j == 1) gain = conf->HFOrderGain[1];
+            else if(j == 4) gain = conf->HFOrderGain[2];
+            else if(j == 9) gain = conf->HFOrderGain[3];
+            if((conf->ChanMask&(1<<j)))
+                chanmap[i].Config[j] = conf->HFMatrix[i][k++] / coeff_scale[j] * gain;
+        }
+    }
+
+    SetChannelMap(device->RealOut.ChannelName, device->Dry.Ambi.Coeffs, chanmap,
+                  conf->NumSpeakers, &device->Dry.NumChannels);
+    device->Dry.CoeffCount = (conf->ChanMask > 0x1ff) ? 16 :
+                             (conf->ChanMask > 0xf) ? 9 : 4;
+
+    memset(&device->FOAOut.Ambi, 0, sizeof(device->FOAOut.Ambi));
+    for(i = 0;i < device->Dry.NumChannels;i++)
+    {
+        device->FOAOut.Ambi.Coeffs[i][0] = device->Dry.Ambi.Coeffs[i][0] * w_scale;
+        for(j = 1;j < 4;j++)
+            device->FOAOut.Ambi.Coeffs[i][j] = device->Dry.Ambi.Coeffs[i][j] * xyz_scale;
+    }
+    device->FOAOut.CoeffCount = 4;
+    device->FOAOut.NumChannels = 0;
+
+    device->RealOut.NumChannels = 0;
+
+    InitDistanceComp(device, conf, speakermap);
+}
+
+static void InitHQPanning(ALCdevice *device, const AmbDecConf *conf, const ALsizei speakermap[MAX_OUTPUT_CHANNELS])
+{
+    static const ALsizei chans_per_order2d[MAX_AMBI_ORDER+1] = { 1, 2, 2, 2 };
+    static const ALsizei chans_per_order3d[MAX_AMBI_ORDER+1] = { 1, 3, 5, 7 };
+    ALfloat avg_dist;
+    ALsizei count;
+    ALsizei i;
+
+    if((conf->ChanMask&AMBI_PERIPHONIC_MASK))
+    {
+        count = (conf->ChanMask > 0x1ff) ? 16 :
+                (conf->ChanMask > 0xf) ? 9 : 4;
+        for(i = 0;i < count;i++)
+        {
+            device->Dry.Ambi.Map[i].Scale = 1.0f;
+            device->Dry.Ambi.Map[i].Index = i;
+        }
+    }
+    else
+    {
+        static const int map[MAX_AMBI2D_COEFFS] = { 0, 1, 3, 4, 8, 9, 15 };
+
+        count = (conf->ChanMask > 0x1ff) ? 7 :
+                (conf->ChanMask > 0xf) ? 5 : 3;
+        for(i = 0;i < count;i++)
+        {
+            device->Dry.Ambi.Map[i].Scale = 1.0f;
+            device->Dry.Ambi.Map[i].Index = map[i];
+        }
+    }
+    device->Dry.CoeffCount = 0;
+    device->Dry.NumChannels = count;
+
+    TRACE("Enabling %s-band %s-order%s ambisonic decoder\n",
+        (conf->FreqBands == 1) ? "single" : "dual",
+        (conf->ChanMask > 0xf) ? (conf->ChanMask > 0x1ff) ? "third" : "second" : "first",
+        (conf->ChanMask&AMBI_PERIPHONIC_MASK) ? " periphonic" : ""
+    );
+    bformatdec_reset(device->AmbiDecoder, conf, count, device->Frequency, speakermap);
+
+    if(conf->ChanMask <= 0xf)
+    {
+        device->FOAOut.Ambi = device->Dry.Ambi;
+        device->FOAOut.CoeffCount = device->Dry.CoeffCount;
+        device->FOAOut.NumChannels = 0;
+    }
+    else
+    {
+        memset(&device->FOAOut.Ambi, 0, sizeof(device->FOAOut.Ambi));
+        if((conf->ChanMask&AMBI_PERIPHONIC_MASK))
+        {
+            count = 4;
+            for(i = 0;i < count;i++)
+            {
+                device->FOAOut.Ambi.Map[i].Scale = 1.0f;
+                device->FOAOut.Ambi.Map[i].Index = i;
+            }
+        }
+        else
+        {
+            static const int map[3] = { 0, 1, 3 };
+            count = 3;
+            for(i = 0;i < count;i++)
+            {
+                device->FOAOut.Ambi.Map[i].Scale = 1.0f;
+                device->FOAOut.Ambi.Map[i].Index = map[i];
+            }
+        }
+        device->FOAOut.CoeffCount = 0;
+        device->FOAOut.NumChannels = count;
+    }
+
+    device->RealOut.NumChannels = ChannelsFromDevFmt(device->FmtChans, device->AmbiOrder);
+
+    avg_dist = 0.0f;
+    for(i = 0;i < conf->NumSpeakers;i++)
+        avg_dist += conf->Speakers[i].Distance;
+    avg_dist /= (ALfloat)conf->NumSpeakers;
+    InitNearFieldCtrl(device, avg_dist,
+        (conf->ChanMask > 0x1ff) ? 3 : (conf->ChanMask > 0xf) ? 2 : 1,
+        (conf->ChanMask&AMBI_PERIPHONIC_MASK) ? chans_per_order3d : chans_per_order2d
+    );
+
+    InitDistanceComp(device, conf, speakermap);
+}
+
+static void InitHrtfPanning(ALCdevice *device)
+{
+    /* NOTE: azimuth goes clockwise. */
+    static const struct AngularPoint AmbiPoints[] = {
+        { DEG2RAD( 90.0f), DEG2RAD(   0.0f) },
+        { DEG2RAD( 35.2643897f), DEG2RAD(  45.0f) },
+        { DEG2RAD( 35.2643897f), DEG2RAD( 135.0f) },
+        { DEG2RAD( 35.2643897f), DEG2RAD(-135.0f) },
+        { DEG2RAD( 35.2643897f), DEG2RAD( -45.0f) },
+        { DEG2RAD(  0.0f), DEG2RAD(   0.0f) },
+        { DEG2RAD(  0.0f), DEG2RAD(  45.0f) },
+        { DEG2RAD(  0.0f), DEG2RAD(  90.0f) },
+        { DEG2RAD(  0.0f), DEG2RAD( 135.0f) },
+        { DEG2RAD(  0.0f), DEG2RAD( 180.0f) },
+        { DEG2RAD(  0.0f), DEG2RAD(-135.0f) },
+        { DEG2RAD(  0.0f), DEG2RAD( -90.0f) },
+        { DEG2RAD(  0.0f), DEG2RAD( -45.0f) },
+        { DEG2RAD(-35.2643897f), DEG2RAD(  45.0f) },
+        { DEG2RAD(-35.2643897f), DEG2RAD( 135.0f) },
+        { DEG2RAD(-35.2643897f), DEG2RAD(-135.0f) },
+        { DEG2RAD(-35.2643897f), DEG2RAD( -45.0f) },
+        { DEG2RAD(-90.0f), DEG2RAD(   0.0f) },
+    };
+    static const ALfloat AmbiMatrixFOA[][MAX_AMBI_COEFFS] = {
+        { 5.55555556e-02f,  0.00000000e+00f,  1.23717915e-01f,  0.00000000e+00f },
+        { 5.55555556e-02f, -5.00000000e-02f,  7.14285715e-02f,  5.00000000e-02f },
+        { 5.55555556e-02f, -5.00000000e-02f,  7.14285715e-02f, -5.00000000e-02f },
+        { 5.55555556e-02f,  5.00000000e-02f,  7.14285715e-02f, -5.00000000e-02f },
+        { 5.55555556e-02f,  5.00000000e-02f,  7.14285715e-02f,  5.00000000e-02f },
+        { 5.55555556e-02f,  0.00000000e+00f,  0.00000000e+00f,  8.66025404e-02f },
+        { 5.55555556e-02f, -6.12372435e-02f,  0.00000000e+00f,  6.12372435e-02f },
+        { 5.55555556e-02f, -8.66025404e-02f,  0.00000000e+00f,  0.00000000e+00f },
+        { 5.55555556e-02f, -6.12372435e-02f,  0.00000000e+00f, -6.12372435e-02f },
+        { 5.55555556e-02f,  0.00000000e+00f,  0.00000000e+00f, -8.66025404e-02f },
+        { 5.55555556e-02f,  6.12372435e-02f,  0.00000000e+00f, -6.12372435e-02f },
+        { 5.55555556e-02f,  8.66025404e-02f,  0.00000000e+00f,  0.00000000e+00f },
+        { 5.55555556e-02f,  6.12372435e-02f,  0.00000000e+00f,  6.12372435e-02f },
+        { 5.55555556e-02f, -5.00000000e-02f, -7.14285715e-02f,  5.00000000e-02f },
+        { 5.55555556e-02f, -5.00000000e-02f, -7.14285715e-02f, -5.00000000e-02f },
+        { 5.55555556e-02f,  5.00000000e-02f, -7.14285715e-02f, -5.00000000e-02f },
+        { 5.55555556e-02f,  5.00000000e-02f, -7.14285715e-02f,  5.00000000e-02f },
+        { 5.55555556e-02f,  0.00000000e+00f, -1.23717915e-01f,  0.00000000e+00f },
+    }, AmbiMatrixHOA[][MAX_AMBI_COEFFS] = {
+        { 5.55555556e-02f,  0.00000000e+00f,  1.23717915e-01f,  0.00000000e+00f,  0.00000000e+00f,  0.00000000e+00f },
+        { 5.55555556e-02f, -5.00000000e-02f,  7.14285715e-02f,  5.00000000e-02f, -4.55645099e-02f,  0.00000000e+00f },
+        { 5.55555556e-02f, -5.00000000e-02f,  7.14285715e-02f, -5.00000000e-02f,  4.55645099e-02f,  0.00000000e+00f },
+        { 5.55555556e-02f,  5.00000000e-02f,  7.14285715e-02f, -5.00000000e-02f, -4.55645099e-02f,  0.00000000e+00f },
+        { 5.55555556e-02f,  5.00000000e-02f,  7.14285715e-02f,  5.00000000e-02f,  4.55645099e-02f,  0.00000000e+00f },
+        { 5.55555556e-02f,  0.00000000e+00f,  0.00000000e+00f,  8.66025404e-02f,  0.00000000e+00f,  1.29099445e-01f },
+        { 5.55555556e-02f, -6.12372435e-02f,  0.00000000e+00f,  6.12372435e-02f, -6.83467648e-02f,  0.00000000e+00f },
+        { 5.55555556e-02f, -8.66025404e-02f,  0.00000000e+00f,  0.00000000e+00f,  0.00000000e+00f, -1.29099445e-01f },
+        { 5.55555556e-02f, -6.12372435e-02f,  0.00000000e+00f, -6.12372435e-02f,  6.83467648e-02f,  0.00000000e+00f },
+        { 5.55555556e-02f,  0.00000000e+00f,  0.00000000e+00f, -8.66025404e-02f,  0.00000000e+00f,  1.29099445e-01f },
+        { 5.55555556e-02f,  6.12372435e-02f,  0.00000000e+00f, -6.12372435e-02f, -6.83467648e-02f,  0.00000000e+00f },
+        { 5.55555556e-02f,  8.66025404e-02f,  0.00000000e+00f,  0.00000000e+00f,  0.00000000e+00f, -1.29099445e-01f },
+        { 5.55555556e-02f,  6.12372435e-02f,  0.00000000e+00f,  6.12372435e-02f,  6.83467648e-02f,  0.00000000e+00f },
+        { 5.55555556e-02f, -5.00000000e-02f, -7.14285715e-02f,  5.00000000e-02f, -4.55645099e-02f,  0.00000000e+00f },
+        { 5.55555556e-02f, -5.00000000e-02f, -7.14285715e-02f, -5.00000000e-02f,  4.55645099e-02f,  0.00000000e+00f },
+        { 5.55555556e-02f,  5.00000000e-02f, -7.14285715e-02f, -5.00000000e-02f, -4.55645099e-02f,  0.00000000e+00f },
+        { 5.55555556e-02f,  5.00000000e-02f, -7.14285715e-02f,  5.00000000e-02f,  4.55645099e-02f,  0.00000000e+00f },
+        { 5.55555556e-02f,  0.00000000e+00f, -1.23717915e-01f,  0.00000000e+00f,  0.00000000e+00f,  0.00000000e+00f },
+    };
+    static const ALfloat AmbiOrderHFGainFOA[MAX_AMBI_ORDER+1] = {
+        3.00000000e+00f, 1.73205081e+00f
+    }, AmbiOrderHFGainHOA[MAX_AMBI_ORDER+1] = {
+        2.40192231e+00f, 1.86052102e+00f, 9.60768923e-01f
+    };
+    static const ALsizei IndexMap[6] = { 0, 1, 2, 3, 4, 8 };
+    static const ALsizei ChansPerOrder[MAX_AMBI_ORDER+1] = { 1, 3, 2, 0 };
+    const ALfloat (*RESTRICT AmbiMatrix)[MAX_AMBI_COEFFS] = AmbiMatrixFOA;
+    const ALfloat *RESTRICT AmbiOrderHFGain = AmbiOrderHFGainFOA;
+    ALsizei count = 4;
+    ALsizei i;
+
+    static_assert(COUNTOF(AmbiPoints) == COUNTOF(AmbiMatrixFOA), "FOA Ambisonic HRTF mismatch");
+    static_assert(COUNTOF(AmbiPoints) == COUNTOF(AmbiMatrixHOA), "HOA Ambisonic HRTF mismatch");
+
+    if(device->AmbiUp)
+    {
+        AmbiMatrix = AmbiMatrixHOA;
+        AmbiOrderHFGain = AmbiOrderHFGainHOA;
+        count = COUNTOF(IndexMap);
+    }
+
+    device->Hrtf = reinterpret_cast<DirectHrtfState*>(
+        al_calloc(16, FAM_SIZE(DirectHrtfState, Chan, count)));
+
+    for(i = 0;i < count;i++)
+    {
+        device->Dry.Ambi.Map[i].Scale = 1.0f;
+        device->Dry.Ambi.Map[i].Index = IndexMap[i];
+    }
+    device->Dry.CoeffCount = 0;
+    device->Dry.NumChannels = count;
+
+    if(device->AmbiUp)
+    {
+        memset(&device->FOAOut.Ambi, 0, sizeof(device->FOAOut.Ambi));
+        for(i = 0;i < 4;i++)
+        {
+            device->FOAOut.Ambi.Map[i].Scale = 1.0f;
+            device->FOAOut.Ambi.Map[i].Index = i;
+        }
+        device->FOAOut.CoeffCount = 0;
+        device->FOAOut.NumChannels = 4;
+
+        ambiup_reset(device->AmbiUp, device, AmbiOrderHFGainFOA[0] / AmbiOrderHFGain[0],
+                     AmbiOrderHFGainFOA[1] / AmbiOrderHFGain[1]);
+    }
+    else
+    {
+        device->FOAOut.Ambi = device->Dry.Ambi;
+        device->FOAOut.CoeffCount = device->Dry.CoeffCount;
+        device->FOAOut.NumChannels = 0;
+    }
+
+    device->RealOut.NumChannels = ChannelsFromDevFmt(device->FmtChans, device->AmbiOrder);
+
+    BuildBFormatHrtf(device->HrtfHandle,
+        device->Hrtf, device->Dry.NumChannels, AmbiPoints, AmbiMatrix, COUNTOF(AmbiPoints),
+        AmbiOrderHFGain
+    );
+
+    InitNearFieldCtrl(device, device->HrtfHandle->distance, device->AmbiUp ? 2 : 1,
+                      ChansPerOrder);
+}
+
+static void InitUhjPanning(ALCdevice *device)
+{
+    ALsizei count = 3;
+    ALsizei i;
+
+    for(i = 0;i < count;i++)
+    {
+        ALsizei acn = FuMa2ACN[i];
+        device->Dry.Ambi.Map[i].Scale = 1.0f/FuMa2N3DScale[acn];
+        device->Dry.Ambi.Map[i].Index = acn;
+    }
+    device->Dry.CoeffCount = 0;
+    device->Dry.NumChannels = count;
+
+    device->FOAOut.Ambi = device->Dry.Ambi;
+    device->FOAOut.CoeffCount = device->Dry.CoeffCount;
+    device->FOAOut.NumChannels = 0;
+
+    device->RealOut.NumChannels = ChannelsFromDevFmt(device->FmtChans, device->AmbiOrder);
+}
+
+void aluInitRenderer(ALCdevice *device, ALint hrtf_id, enum HrtfRequestMode hrtf_appreq, enum HrtfRequestMode hrtf_userreq)
+{
+    /* Hold the HRTF the device last used, in case it's used again. */
+    struct Hrtf *old_hrtf = device->HrtfHandle;
+    const char *mode;
+    bool headphones;
+    int bs2blevel;
+    size_t i;
+
+    al_free(device->Hrtf);
+    device->Hrtf = NULL;
+    device->HrtfHandle = NULL;
+    alstr_clear(&device->HrtfName);
+    device->Render_Mode = NormalRender;
+
+    memset(&device->Dry.Ambi, 0, sizeof(device->Dry.Ambi));
+    device->Dry.CoeffCount = 0;
+    device->Dry.NumChannels = 0;
+    for(i = 0;i < MAX_AMBI_ORDER+1;i++)
+        device->NumChannelsPerOrder[i] = 0;
+
+    device->AvgSpeakerDist = 0.0f;
+    memset(device->ChannelDelay, 0, sizeof(device->ChannelDelay));
+    for(i = 0;i < MAX_OUTPUT_CHANNELS;i++)
+    {
+        device->ChannelDelay[i].Gain = 1.0f;
+        device->ChannelDelay[i].Length = 0;
+    }
+
+    al_free(device->Stablizer);
+    device->Stablizer = NULL;
+
+    if(device->FmtChans != DevFmtStereo)
+    {
+        ALsizei speakermap[MAX_OUTPUT_CHANNELS];
+        const char *devname, *layout = NULL;
+        AmbDecConf conf, *pconf = NULL;
+
+        if(old_hrtf)
+            Hrtf_DecRef(old_hrtf);
+        old_hrtf = NULL;
+        if(hrtf_appreq == Hrtf_Enable)
+            device->HrtfStatus = ALC_HRTF_UNSUPPORTED_FORMAT_SOFT;
+
+        ambdec_init(&conf);
+
+        devname = alstr_get_cstr(device->DeviceName);
+        switch(device->FmtChans)
+        {
+            case DevFmtQuad: layout = "quad"; break;
+            case DevFmtX51: /* fall-through */
+            case DevFmtX51Rear: layout = "surround51"; break;
+            case DevFmtX61: layout = "surround61"; break;
+            case DevFmtX71: layout = "surround71"; break;
+            /* Mono, Stereo, and Ambisonics output don't use custom decoders. */
+            case DevFmtMono:
+            case DevFmtStereo:
+            case DevFmtAmbi3D:
+                break;
+        }
+        if(layout)
+        {
+            const char *fname;
+            if(ConfigValueStr(devname, "decoder", layout, &fname))
+            {
+                if(!ambdec_load(&conf, fname))
+                    ERR("Failed to load layout file %s\n", fname);
+                else
+                {
+                    if(conf.ChanMask > 0xffff)
+                        ERR("Unsupported channel mask 0x%04x (max 0xffff)\n", conf.ChanMask);
+                    else
+                    {
+                        if(MakeSpeakerMap(device, &conf, speakermap))
+                            pconf = &conf;
+                    }
+                }
+            }
+        }
+
+        if(pconf && GetConfigValueBool(devname, "decoder", "hq-mode", 0))
+        {
+            ambiup_free(&device->AmbiUp);
+            if(!device->AmbiDecoder)
+                device->AmbiDecoder = bformatdec_alloc();
+        }
+        else
+        {
+            bformatdec_free(&device->AmbiDecoder);
+            if(device->FmtChans != DevFmtAmbi3D || device->AmbiOrder < 2)
+                ambiup_free(&device->AmbiUp);
+            else
+            {
+                if(!device->AmbiUp)
+                    device->AmbiUp = ambiup_alloc();
+            }
+        }
+
+        if(!pconf)
+            InitPanning(device);
+        else if(device->AmbiDecoder)
+            InitHQPanning(device, pconf, speakermap);
+        else
+            InitCustomPanning(device, pconf, speakermap);
+
+        /* Enable the stablizer only for formats that have front-left, front-
+         * right, and front-center outputs.
+         */
+        switch(device->FmtChans)
+        {
+        case DevFmtX51:
+        case DevFmtX51Rear:
+        case DevFmtX61:
+        case DevFmtX71:
+            if(GetConfigValueBool(devname, NULL, "front-stablizer", 0))
+            {
+                /* Initialize band-splitting filters for the front-left and
+                 * front-right channels, with a crossover at 5khz (could be
+                 * higher).
+                 */
+                ALfloat scale = (ALfloat)(5000.0 / device->Frequency);
+                FrontStablizer *stablizer = reinterpret_cast<FrontStablizer*>(
+                    al_calloc(16, sizeof(*stablizer)));
+
+                bandsplit_init(&stablizer->LFilter, scale);
+                stablizer->RFilter = stablizer->LFilter;
+
+                /* Initialize all-pass filters for all other channels. */
+                splitterap_init(&stablizer->APFilter[0], scale);
+                for(i = 1;i < (size_t)device->RealOut.NumChannels;i++)
+                    stablizer->APFilter[i] = stablizer->APFilter[0];
+
+                device->Stablizer = stablizer;
+            }
+            break;
+        case DevFmtMono:
+        case DevFmtStereo:
+        case DevFmtQuad:
+        case DevFmtAmbi3D:
+            break;
+        }
+        TRACE("Front stablizer %s\n", device->Stablizer ? "enabled" : "disabled");
+
+        ambdec_deinit(&conf);
+        return;
+    }
+
+    bformatdec_free(&device->AmbiDecoder);
+
+    headphones = device->IsHeadphones;
+    if(device->Type != Loopback)
+    {
+        const char *mode;
+        if(ConfigValueStr(alstr_get_cstr(device->DeviceName), NULL, "stereo-mode", &mode))
+        {
+            if(strcasecmp(mode, "headphones") == 0)
+                headphones = true;
+            else if(strcasecmp(mode, "speakers") == 0)
+                headphones = false;
+            else if(strcasecmp(mode, "auto") != 0)
+                ERR("Unexpected stereo-mode: %s\n", mode);
+        }
+    }
+
+    if(hrtf_userreq == Hrtf_Default)
+    {
+        bool usehrtf = (headphones && hrtf_appreq != Hrtf_Disable) ||
+                       (hrtf_appreq == Hrtf_Enable);
+        if(!usehrtf) goto no_hrtf;
+
+        device->HrtfStatus = ALC_HRTF_ENABLED_SOFT;
+        if(headphones && hrtf_appreq != Hrtf_Disable)
+            device->HrtfStatus = ALC_HRTF_HEADPHONES_DETECTED_SOFT;
+    }
+    else
+    {
+        if(hrtf_userreq != Hrtf_Enable)
+        {
+            if(hrtf_appreq == Hrtf_Enable)
+                device->HrtfStatus = ALC_HRTF_DENIED_SOFT;
+            goto no_hrtf;
+        }
+        device->HrtfStatus = ALC_HRTF_REQUIRED_SOFT;
+    }
+
+    if(VECTOR_SIZE(device->HrtfList) == 0)
+    {
+        VECTOR_DEINIT(device->HrtfList);
+        device->HrtfList = EnumerateHrtf(device->DeviceName);
+    }
+
+    if(hrtf_id >= 0 && (size_t)hrtf_id < VECTOR_SIZE(device->HrtfList))
+    {
+        const EnumeratedHrtf *entry = &VECTOR_ELEM(device->HrtfList, hrtf_id);
+        struct Hrtf *hrtf = GetLoadedHrtf(entry->hrtf);
+        if(hrtf && hrtf->sampleRate == device->Frequency)
+        {
+            device->HrtfHandle = hrtf;
+            alstr_copy(&device->HrtfName, entry->name);
+        }
+        else if(hrtf)
+            Hrtf_DecRef(hrtf);
+    }
+
+    for(i = 0;!device->HrtfHandle && i < VECTOR_SIZE(device->HrtfList);i++)
+    {
+        const EnumeratedHrtf *entry = &VECTOR_ELEM(device->HrtfList, i);
+        struct Hrtf *hrtf = GetLoadedHrtf(entry->hrtf);
+        if(hrtf && hrtf->sampleRate == device->Frequency)
+        {
+            device->HrtfHandle = hrtf;
+            alstr_copy(&device->HrtfName, entry->name);
+        }
+        else if(hrtf)
+            Hrtf_DecRef(hrtf);
+    }
+
+    if(device->HrtfHandle)
+    {
+        if(old_hrtf)
+            Hrtf_DecRef(old_hrtf);
+        old_hrtf = NULL;
+
+        device->Render_Mode = HrtfRender;
+        if(ConfigValueStr(alstr_get_cstr(device->DeviceName), NULL, "hrtf-mode", &mode))
+        {
+            if(strcasecmp(mode, "full") == 0)
+                device->Render_Mode = HrtfRender;
+            else if(strcasecmp(mode, "basic") == 0)
+                device->Render_Mode = NormalRender;
+            else
+                ERR("Unexpected hrtf-mode: %s\n", mode);
+        }
+
+        if(device->Render_Mode == HrtfRender)
+        {
+            /* Don't bother with HOA when using full HRTF rendering. Nothing
+             * needs it, and it eases the CPU/memory load.
+             */
+            ambiup_free(&device->AmbiUp);
+        }
+        else
+        {
+            if(!device->AmbiUp)
+                device->AmbiUp = ambiup_alloc();
+        }
+
+        TRACE("%s HRTF rendering enabled, using \"%s\"\n",
+            ((device->Render_Mode == HrtfRender) ? "Full" : "Basic"),
+            alstr_get_cstr(device->HrtfName)
+        );
+        InitHrtfPanning(device);
+        return;
+    }
+    device->HrtfStatus = ALC_HRTF_UNSUPPORTED_FORMAT_SOFT;
+
+no_hrtf:
+    if(old_hrtf)
+        Hrtf_DecRef(old_hrtf);
+    old_hrtf = NULL;
+    TRACE("HRTF disabled\n");
+
+    device->Render_Mode = StereoPair;
+
+    ambiup_free(&device->AmbiUp);
+
+    bs2blevel = ((headphones && hrtf_appreq != Hrtf_Disable) ||
+                 (hrtf_appreq == Hrtf_Enable)) ? 5 : 0;
+    if(device->Type != Loopback)
+        ConfigValueInt(alstr_get_cstr(device->DeviceName), NULL, "cf_level", &bs2blevel);
+    if(bs2blevel > 0 && bs2blevel <= 6)
+    {
+        device->Bs2b = reinterpret_cast<struct bs2b*>(al_calloc(16, sizeof(*device->Bs2b)));
+        bs2b_set_params(device->Bs2b, bs2blevel, device->Frequency);
+        TRACE("BS2B enabled\n");
+        InitPanning(device);
+        return;
+    }
+
+    TRACE("BS2B disabled\n");
+
+    if(ConfigValueStr(alstr_get_cstr(device->DeviceName), NULL, "stereo-encoding", &mode))
+    {
+        if(strcasecmp(mode, "uhj") == 0)
+            device->Render_Mode = NormalRender;
+        else if(strcasecmp(mode, "panpot") != 0)
+            ERR("Unexpected stereo-encoding: %s\n", mode);
+    }
+    if(device->Render_Mode == NormalRender)
+    {
+        device->Uhj_Encoder = reinterpret_cast<Uhj2Encoder*>(al_calloc(16, sizeof(Uhj2Encoder)));
+        TRACE("UHJ enabled\n");
+        InitUhjPanning(device);
+        return;
+    }
+
+    TRACE("UHJ disabled\n");
+    InitPanning(device);
+}
+
+
+void aluInitEffectPanning(ALeffectslot *slot)
+{
+    ALsizei i;
+
+    memset(slot->ChanMap, 0, sizeof(slot->ChanMap));
+    slot->NumChannels = 0;
+
+    for(i = 0;i < MAX_EFFECT_CHANNELS;i++)
+    {
+        slot->ChanMap[i].Scale = 1.0f;
+        slot->ChanMap[i].Index = i;
+    }
+    slot->NumChannels = i;
+}