Rename Alc to alc

1 files changed, 337 insertions, 0 deletions

diff --git a/alc/effects/equalizer.cpp b/alc/effects/equalizer.cpp
new file mode 100644
index 00000000..69ab5021
--- /dev/null
+++ b/alc/effects/equalizer.cpp
@@ -0,0 +1,337 @@
+/**
+ * OpenAL cross platform audio library
+ * Copyright (C) 2013 by Mike Gorchak
+ * 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 <cmath>
+#include <cstdlib>
+
+#include <algorithm>
+#include <functional>
+
+#include "alcmain.h"
+#include "alcontext.h"
+#include "alAuxEffectSlot.h"
+#include "alError.h"
+#include "alu.h"
+#include "filters/biquad.h"
+#include "vecmat.h"
+
+
+namespace {
+
+/*  The document  "Effects Extension Guide.pdf"  says that low and high  *
+ *  frequencies are cutoff frequencies. This is not fully correct, they  *
+ *  are corner frequencies for low and high shelf filters. If they were  *
+ *  just cutoff frequencies, there would be no need in cutoff frequency  *
+ *  gains, which are present.  Documentation for  "Creative Proteus X2"  *
+ *  software describes  4-band equalizer functionality in a much better  *
+ *  way.  This equalizer seems  to be a predecessor  of  OpenAL  4-band  *
+ *  equalizer.  With low and high  shelf filters  we are able to cutoff  *
+ *  frequencies below and/or above corner frequencies using attenuation  *
+ *  gains (below 1.0) and amplify all low and/or high frequencies using  *
+ *  gains above 1.0.                                                     *
+ *                                                                       *
+ *     Low-shelf       Low Mid Band      High Mid Band     High-shelf    *
+ *      corner            center             center          corner      *
+ *     frequency        frequency          frequency       frequency     *
+ *    50Hz..800Hz     200Hz..3000Hz      1000Hz..8000Hz  4000Hz..16000Hz *
+ *                                                                       *
+ *          |               |                  |               |         *
+ *          |               |                  |               |         *
+ *   B -----+            /--+--\            /--+--\            +-----    *
+ *   O      |\          |   |   |          |   |   |          /|         *
+ *   O      | \        -    |    -        -    |    -        / |         *
+ *   S +    |  \      |     |     |      |     |     |      /  |         *
+ *   T      |   |    |      |      |    |      |      |    |   |         *
+ * ---------+---------------+------------------+---------------+-------- *
+ *   C      |   |    |      |      |    |      |      |    |   |         *
+ *   U -    |  /      |     |     |      |     |     |      \  |         *
+ *   T      | /        -    |    -        -    |    -        \ |         *
+ *   O      |/          |   |   |          |   |   |          \|         *
+ *   F -----+            \--+--/            \--+--/            +-----    *
+ *   F      |               |                  |               |         *
+ *          |               |                  |               |         *
+ *                                                                       *
+ * Gains vary from 0.126 up to 7.943, which means from -18dB attenuation *
+ * up to +18dB amplification. Band width varies from 0.01 up to 1.0 in   *
+ * octaves for two mid bands.                                            *
+ *                                                                       *
+ * Implementation is based on the "Cookbook formulae for audio EQ biquad *
+ * filter coefficients" by Robert Bristow-Johnson                        *
+ * http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt                   */
+
+
+struct EqualizerState final : public EffectState {
+    struct {
+        /* Effect parameters */
+        BiquadFilter filter[4];
+
+        /* Effect gains for each channel */
+        ALfloat CurrentGains[MAX_OUTPUT_CHANNELS]{};
+        ALfloat TargetGains[MAX_OUTPUT_CHANNELS]{};
+    } mChans[MAX_AMBI_CHANNELS];
+
+    ALfloat mSampleBuffer[BUFFERSIZE]{};
+
+
+    ALboolean deviceUpdate(const ALCdevice *device) override;
+    void update(const ALCcontext *context, const ALeffectslot *slot, const EffectProps *props, const EffectTarget target) override;
+    void process(const ALsizei samplesToDo, const FloatBufferLine *RESTRICT samplesIn, const ALsizei numInput, const al::span<FloatBufferLine> samplesOut) override;
+
+    DEF_NEWDEL(EqualizerState)
+};
+
+ALboolean EqualizerState::deviceUpdate(const ALCdevice*)
+{
+    for(auto &e : mChans)
+    {
+        std::for_each(std::begin(e.filter), std::end(e.filter),
+                      std::mem_fn(&BiquadFilter::clear));
+        std::fill(std::begin(e.CurrentGains), std::end(e.CurrentGains), 0.0f);
+    }
+    return AL_TRUE;
+}
+
+void EqualizerState::update(const ALCcontext *context, const ALeffectslot *slot, const EffectProps *props, const EffectTarget target)
+{
+    const ALCdevice *device = context->Device;
+    auto frequency = static_cast<ALfloat>(device->Frequency);
+    ALfloat gain, f0norm;
+
+    /* Calculate coefficients for the each type of filter. Note that the shelf
+     * filters' gain is for the reference frequency, which is the centerpoint
+     * of the transition band.
+     */
+    gain = maxf(sqrtf(props->Equalizer.LowGain), 0.0625f); /* Limit -24dB */
+    f0norm = props->Equalizer.LowCutoff/frequency;
+    mChans[0].filter[0].setParams(BiquadType::LowShelf, gain, f0norm,
+        BiquadFilter::rcpQFromSlope(gain, 0.75f));
+
+    gain = maxf(props->Equalizer.Mid1Gain, 0.0625f);
+    f0norm = props->Equalizer.Mid1Center/frequency;
+    mChans[0].filter[1].setParams(BiquadType::Peaking, gain, f0norm,
+        BiquadFilter::rcpQFromBandwidth(f0norm, props->Equalizer.Mid1Width));
+
+    gain = maxf(props->Equalizer.Mid2Gain, 0.0625f);
+    f0norm = props->Equalizer.Mid2Center/frequency;
+    mChans[0].filter[2].setParams(BiquadType::Peaking, gain, f0norm,
+        BiquadFilter::rcpQFromBandwidth(f0norm, props->Equalizer.Mid2Width));
+
+    gain = maxf(sqrtf(props->Equalizer.HighGain), 0.0625f);
+    f0norm = props->Equalizer.HighCutoff/frequency;
+    mChans[0].filter[3].setParams(BiquadType::HighShelf, gain, f0norm,
+        BiquadFilter::rcpQFromSlope(gain, 0.75f));
+
+    /* Copy the filter coefficients for the other input channels. */
+    for(size_t i{1u};i < slot->Wet.Buffer.size();++i)
+    {
+        mChans[i].filter[0].copyParamsFrom(mChans[0].filter[0]);
+        mChans[i].filter[1].copyParamsFrom(mChans[0].filter[1]);
+        mChans[i].filter[2].copyParamsFrom(mChans[0].filter[2]);
+        mChans[i].filter[3].copyParamsFrom(mChans[0].filter[3]);
+    }
+
+    mOutTarget = target.Main->Buffer;
+    for(size_t i{0u};i < slot->Wet.Buffer.size();++i)
+    {
+        auto coeffs = GetAmbiIdentityRow(i);
+        ComputePanGains(target.Main, coeffs.data(), slot->Params.Gain, mChans[i].TargetGains);
+    }
+}
+
+void EqualizerState::process(const ALsizei samplesToDo, const FloatBufferLine *RESTRICT samplesIn, const ALsizei numInput, const al::span<FloatBufferLine> samplesOut)
+{
+    ASSUME(numInput > 0);
+    for(ALsizei c{0};c < numInput;c++)
+    {
+        mChans[c].filter[0].process(mSampleBuffer, samplesIn[c].data(), samplesToDo);
+        mChans[c].filter[1].process(mSampleBuffer, mSampleBuffer, samplesToDo);
+        mChans[c].filter[2].process(mSampleBuffer, mSampleBuffer, samplesToDo);
+        mChans[c].filter[3].process(mSampleBuffer, mSampleBuffer, samplesToDo);
+
+        MixSamples(mSampleBuffer, samplesOut, mChans[c].CurrentGains, mChans[c].TargetGains,
+            samplesToDo, 0, samplesToDo);
+    }
+}
+
+
+void Equalizer_setParami(EffectProps*, ALCcontext *context, ALenum param, ALint)
+{ alSetError(context, AL_INVALID_ENUM, "Invalid equalizer integer property 0x%04x", param); }
+void Equalizer_setParamiv(EffectProps*, ALCcontext *context, ALenum param, const ALint*)
+{ alSetError(context, AL_INVALID_ENUM, "Invalid equalizer integer-vector property 0x%04x", param); }
+void Equalizer_setParamf(EffectProps *props, ALCcontext *context, ALenum param, ALfloat val)
+{
+    switch(param)
+    {
+        case AL_EQUALIZER_LOW_GAIN:
+            if(!(val >= AL_EQUALIZER_MIN_LOW_GAIN && val <= AL_EQUALIZER_MAX_LOW_GAIN))
+                SETERR_RETURN(context, AL_INVALID_VALUE,, "Equalizer low-band gain out of range");
+            props->Equalizer.LowGain = val;
+            break;
+
+        case AL_EQUALIZER_LOW_CUTOFF:
+            if(!(val >= AL_EQUALIZER_MIN_LOW_CUTOFF && val <= AL_EQUALIZER_MAX_LOW_CUTOFF))
+                SETERR_RETURN(context, AL_INVALID_VALUE,, "Equalizer low-band cutoff out of range");
+            props->Equalizer.LowCutoff = val;
+            break;
+
+        case AL_EQUALIZER_MID1_GAIN:
+            if(!(val >= AL_EQUALIZER_MIN_MID1_GAIN && val <= AL_EQUALIZER_MAX_MID1_GAIN))
+                SETERR_RETURN(context, AL_INVALID_VALUE,, "Equalizer mid1-band gain out of range");
+            props->Equalizer.Mid1Gain = val;
+            break;
+
+        case AL_EQUALIZER_MID1_CENTER:
+            if(!(val >= AL_EQUALIZER_MIN_MID1_CENTER && val <= AL_EQUALIZER_MAX_MID1_CENTER))
+                SETERR_RETURN(context, AL_INVALID_VALUE,, "Equalizer mid1-band center out of range");
+            props->Equalizer.Mid1Center = val;
+            break;
+
+        case AL_EQUALIZER_MID1_WIDTH:
+            if(!(val >= AL_EQUALIZER_MIN_MID1_WIDTH && val <= AL_EQUALIZER_MAX_MID1_WIDTH))
+                SETERR_RETURN(context, AL_INVALID_VALUE,, "Equalizer mid1-band width out of range");
+            props->Equalizer.Mid1Width = val;
+            break;
+
+        case AL_EQUALIZER_MID2_GAIN:
+            if(!(val >= AL_EQUALIZER_MIN_MID2_GAIN && val <= AL_EQUALIZER_MAX_MID2_GAIN))
+                SETERR_RETURN(context, AL_INVALID_VALUE,, "Equalizer mid2-band gain out of range");
+            props->Equalizer.Mid2Gain = val;
+            break;
+
+        case AL_EQUALIZER_MID2_CENTER:
+            if(!(val >= AL_EQUALIZER_MIN_MID2_CENTER && val <= AL_EQUALIZER_MAX_MID2_CENTER))
+                SETERR_RETURN(context, AL_INVALID_VALUE,, "Equalizer mid2-band center out of range");
+            props->Equalizer.Mid2Center = val;
+            break;
+
+        case AL_EQUALIZER_MID2_WIDTH:
+            if(!(val >= AL_EQUALIZER_MIN_MID2_WIDTH && val <= AL_EQUALIZER_MAX_MID2_WIDTH))
+                SETERR_RETURN(context, AL_INVALID_VALUE,, "Equalizer mid2-band width out of range");
+            props->Equalizer.Mid2Width = val;
+            break;
+
+        case AL_EQUALIZER_HIGH_GAIN:
+            if(!(val >= AL_EQUALIZER_MIN_HIGH_GAIN && val <= AL_EQUALIZER_MAX_HIGH_GAIN))
+                SETERR_RETURN(context, AL_INVALID_VALUE,, "Equalizer high-band gain out of range");
+            props->Equalizer.HighGain = val;
+            break;
+
+        case AL_EQUALIZER_HIGH_CUTOFF:
+            if(!(val >= AL_EQUALIZER_MIN_HIGH_CUTOFF && val <= AL_EQUALIZER_MAX_HIGH_CUTOFF))
+                SETERR_RETURN(context, AL_INVALID_VALUE,, "Equalizer high-band cutoff out of range");
+            props->Equalizer.HighCutoff = val;
+            break;
+
+        default:
+            alSetError(context, AL_INVALID_ENUM, "Invalid equalizer float property 0x%04x", param);
+    }
+}
+void Equalizer_setParamfv(EffectProps *props, ALCcontext *context, ALenum param, const ALfloat *vals)
+{ Equalizer_setParamf(props, context, param, vals[0]); }
+
+void Equalizer_getParami(const EffectProps*, ALCcontext *context, ALenum param, ALint*)
+{ alSetError(context, AL_INVALID_ENUM, "Invalid equalizer integer property 0x%04x", param); }
+void Equalizer_getParamiv(const EffectProps*, ALCcontext *context, ALenum param, ALint*)
+{ alSetError(context, AL_INVALID_ENUM, "Invalid equalizer integer-vector property 0x%04x", param); }
+void Equalizer_getParamf(const EffectProps *props, ALCcontext *context, ALenum param, ALfloat *val)
+{
+    switch(param)
+    {
+        case AL_EQUALIZER_LOW_GAIN:
+            *val = props->Equalizer.LowGain;
+            break;
+
+        case AL_EQUALIZER_LOW_CUTOFF:
+            *val = props->Equalizer.LowCutoff;
+            break;
+
+        case AL_EQUALIZER_MID1_GAIN:
+            *val = props->Equalizer.Mid1Gain;
+            break;
+
+        case AL_EQUALIZER_MID1_CENTER:
+            *val = props->Equalizer.Mid1Center;
+            break;
+
+        case AL_EQUALIZER_MID1_WIDTH:
+            *val = props->Equalizer.Mid1Width;
+            break;
+
+        case AL_EQUALIZER_MID2_GAIN:
+            *val = props->Equalizer.Mid2Gain;
+            break;
+
+        case AL_EQUALIZER_MID2_CENTER:
+            *val = props->Equalizer.Mid2Center;
+            break;
+
+        case AL_EQUALIZER_MID2_WIDTH:
+            *val = props->Equalizer.Mid2Width;
+            break;
+
+        case AL_EQUALIZER_HIGH_GAIN:
+            *val = props->Equalizer.HighGain;
+            break;
+
+        case AL_EQUALIZER_HIGH_CUTOFF:
+            *val = props->Equalizer.HighCutoff;
+            break;
+
+        default:
+            alSetError(context, AL_INVALID_ENUM, "Invalid equalizer float property 0x%04x", param);
+    }
+}
+void Equalizer_getParamfv(const EffectProps *props, ALCcontext *context, ALenum param, ALfloat *vals)
+{ Equalizer_getParamf(props, context, param, vals); }
+
+DEFINE_ALEFFECT_VTABLE(Equalizer);
+
+
+struct EqualizerStateFactory final : public EffectStateFactory {
+    EffectState *create() override { return new EqualizerState{}; }
+    EffectProps getDefaultProps() const noexcept override;
+    const EffectVtable *getEffectVtable() const noexcept override { return &Equalizer_vtable; }
+};
+
+EffectProps EqualizerStateFactory::getDefaultProps() const noexcept
+{
+    EffectProps props{};
+    props.Equalizer.LowCutoff = AL_EQUALIZER_DEFAULT_LOW_CUTOFF;
+    props.Equalizer.LowGain = AL_EQUALIZER_DEFAULT_LOW_GAIN;
+    props.Equalizer.Mid1Center = AL_EQUALIZER_DEFAULT_MID1_CENTER;
+    props.Equalizer.Mid1Gain = AL_EQUALIZER_DEFAULT_MID1_GAIN;
+    props.Equalizer.Mid1Width = AL_EQUALIZER_DEFAULT_MID1_WIDTH;
+    props.Equalizer.Mid2Center = AL_EQUALIZER_DEFAULT_MID2_CENTER;
+    props.Equalizer.Mid2Gain = AL_EQUALIZER_DEFAULT_MID2_GAIN;
+    props.Equalizer.Mid2Width = AL_EQUALIZER_DEFAULT_MID2_WIDTH;
+    props.Equalizer.HighCutoff = AL_EQUALIZER_DEFAULT_HIGH_CUTOFF;
+    props.Equalizer.HighGain = AL_EQUALIZER_DEFAULT_HIGH_GAIN;
+    return props;
+}
+
+} // namespace
+
+EffectStateFactory *EqualizerStateFactory_getFactory()
+{
+    static EqualizerStateFactory EqualizerFactory{};
+    return &EqualizerFactory;
+}