mirror of https://github.com/jorio/Pomme.git
134 lines
2.4 KiB
C++
134 lines
2.4 KiB
C++
#include "PommeSound.h"
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#include "SoundMixer/ChannelImpl.h"
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#include <cassert>
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#ifndef POMME_MAX_CHANNEL_GAIN
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#define POMME_MAX_CHANNEL_GAIN 2.5
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#endif
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namespace Pomme::Sound
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{
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extern ChannelImpl* gHeadChan;
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extern int gNumManagedChans;
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}
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ChannelImpl::ChannelImpl(SndChannelPtr _macChannel, bool transferMacChannelOwnership)
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: macChannel(_macChannel)
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, macChannelStructAllocatedByPomme(transferMacChannelOwnership)
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, source()
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, pan(0.0)
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, gain(1.0)
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, baseNote(kMiddleC)
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, playbackNote(kMiddleC)
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, pitchMult(1.0)
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, loop(false)
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, interpolate(false)
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{
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macChannel->channelImpl = (Ptr) this;
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Link(); // Link chan into our list of managed chans
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}
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ChannelImpl::~ChannelImpl()
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{
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Unlink();
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macChannel->channelImpl = nullptr;
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if (macChannelStructAllocatedByPomme)
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{
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delete macChannel;
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}
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}
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void ChannelImpl::Recycle()
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{
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source.Clear();
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}
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void ChannelImpl::SetInitializationParameters(long initBits)
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{
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interpolate = !(initBits & initNoInterp);
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source.SetInterpolation(interpolate);
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}
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void ChannelImpl::ApplyParametersToSource(int mask)
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{
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// Pitch
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if (mask & kApplyParameters_Pitch)
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{
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double baseFreq = Pomme::Sound::GetMidiNoteFrequency(baseNote);
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double playbackFreq = Pomme::Sound::GetMidiNoteFrequency(playbackNote);
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source.SetPitch(pitchMult * playbackFreq / baseFreq);
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}
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// Pan and gain
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if (mask & kApplyParameters_PanAndGain)
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{
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if (gain > POMME_MAX_CHANNEL_GAIN)
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{
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#if _DEBUG
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printf("Capping extreme channel gain (%f)\n", gain);
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#endif
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gain = POMME_MAX_CHANNEL_GAIN;
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}
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source.SetPan(pan);
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source.SetGain(gain);
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}
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// Interpolation
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if (mask & kApplyParameters_Interpolation)
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{
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source.SetInterpolation(interpolate);
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}
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// Interpolation
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if (mask & kApplyParameters_Loop)
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{
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source.SetLoop(loop);
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}
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}
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void ChannelImpl::Link()
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{
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if (!Pomme::Sound::gHeadChan)
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{
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SetNext(nullptr);
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}
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else
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{
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assert(nullptr == Pomme::Sound::gHeadChan->GetPrev());
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Pomme::Sound::gHeadChan->SetPrev(this);
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SetNext(Pomme::Sound::gHeadChan);
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}
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Pomme::Sound::gHeadChan = this;
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SetPrev(nullptr);
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Pomme::Sound::gNumManagedChans++;
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}
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void ChannelImpl::Unlink()
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{
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if (Pomme::Sound::gHeadChan == this)
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{
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Pomme::Sound::gHeadChan = GetNext();
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}
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if (nullptr != GetPrev())
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{
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GetPrev()->SetNext(GetNext());
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}
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if (nullptr != GetNext())
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{
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GetNext()->SetPrev(GetPrev());
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}
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SetPrev(nullptr);
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SetNext(nullptr);
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Pomme::Sound::gNumManagedChans--;
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}
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