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/**
* OpenAL cross platform audio library
* Copyright (C) 2011 by Chris Robinson.
* 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 <cstdlib>
#include <cmath>
#include <algorithm>
#include "alcmain.h"
#include "alcontext.h"
#include "alu.h"
#include "effectslot.h"
namespace {
struct DedicatedState final : public EffectState {
float mCurrentGains[MAX_OUTPUT_CHANNELS];
float mTargetGains[MAX_OUTPUT_CHANNELS];
void deviceUpdate(const ALCdevice *device) override;
void update(const ALCcontext *context, const EffectSlot *slot, const EffectProps *props,
const EffectTarget target) override;
void process(const size_t samplesToDo, const al::span<const FloatBufferLine> samplesIn,
const al::span<FloatBufferLine> samplesOut) override;
DEF_NEWDEL(DedicatedState)
};
void DedicatedState::deviceUpdate(const ALCdevice*)
{
std::fill(std::begin(mCurrentGains), std::end(mCurrentGains), 0.0f);
}
void DedicatedState::update(const ALCcontext*, const EffectSlot *slot,
const EffectProps *props, const EffectTarget target)
{
std::fill(std::begin(mTargetGains), std::end(mTargetGains), 0.0f);
const float Gain{slot->Gain * props->Dedicated.Gain};
if(slot->EffectType == AL_EFFECT_DEDICATED_LOW_FREQUENCY_EFFECT)
{
const uint idx{!target.RealOut ? INVALID_CHANNEL_INDEX :
GetChannelIdxByName(*target.RealOut, LFE)};
if(idx != INVALID_CHANNEL_INDEX)
{
mOutTarget = target.RealOut->Buffer;
mTargetGains[idx] = Gain;
}
}
else if(slot->EffectType == AL_EFFECT_DEDICATED_DIALOGUE)
{
/* Dialog goes to the front-center speaker if it exists, otherwise it
* plays from the front-center location. */
const uint idx{!target.RealOut ? INVALID_CHANNEL_INDEX :
GetChannelIdxByName(*target.RealOut, FrontCenter)};
if(idx != INVALID_CHANNEL_INDEX)
{
mOutTarget = target.RealOut->Buffer;
mTargetGains[idx] = Gain;
}
else
{
const auto coeffs = CalcDirectionCoeffs({0.0f, 0.0f, -1.0f}, 0.0f);
mOutTarget = target.Main->Buffer;
ComputePanGains(target.Main, coeffs.data(), Gain, mTargetGains);
}
}
}
void DedicatedState::process(const size_t samplesToDo, const al::span<const FloatBufferLine> samplesIn, const al::span<FloatBufferLine> samplesOut)
{
MixSamples({samplesIn[0].data(), samplesToDo}, samplesOut, mCurrentGains, mTargetGains,
samplesToDo, 0);
}
struct DedicatedStateFactory final : public EffectStateFactory {
EffectState *create() override { return new DedicatedState{}; }
};
} // namespace
EffectStateFactory *DedicatedStateFactory_getFactory()
{
static DedicatedStateFactory DedicatedFactory{};
return &DedicatedFactory;
}
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