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Implement listener, emitter, and -3dB pan law

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This commit is contained in:
Jack Andersen
2017-09-18 17:59:20 -10:00
parent aef2b2a707
commit c6781df90a
11 changed files with 348 additions and 250 deletions
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153
lib/Voice.cpp
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@@ -117,7 +117,7 @@ void Voice::_setTotalPitch(int32_t cents, bool slew)
{
// fprintf(stderr, "PITCH %d %d \n", cents, slew);
int32_t interval = cents - m_curSample->first.m_pitch * 100;
double ratio = std::exp2(interval / 1200.0);
double ratio = std::exp2(interval / 1200.0) * m_dopplerRatio;
m_sampleRate = m_curSample->first.m_sampleRate * ratio;
m_backendVoice->setPitchRatio(ratio, slew);
}
@@ -947,46 +947,113 @@ void Voice::setVolume(float vol)
vox->setVolume(vol);
}
void Voice::_panLaw(float coefs[8], float frontPan, float backPan, float totalSpan) const
{
/* -3dB panning law for various channel configs */
switch (m_engine.m_channelSet)
{
case AudioChannelSet::Stereo:
default:
/* Left */
coefs[0] = -frontPan * 0.5f + 0.5f;
/* Right */
coefs[1] = frontPan * 0.5f + 0.5f;
break;
case AudioChannelSet::Quad:
/* Left */
coefs[0] = -frontPan * 0.5f + 0.5f;
coefs[0] *= -totalSpan * 0.5f + 0.5f;
/* Right */
coefs[1] = frontPan * 0.5f + 0.5f;
coefs[1] *= -totalSpan * 0.5f + 0.5f;
/* Back Left */
coefs[2] = -backPan * 0.5f + 0.5f;
coefs[2] *= totalSpan * 0.5f + 0.5f;
/* Back Right */
coefs[3] = backPan * 0.5f + 0.5f;
coefs[3] *= totalSpan * 0.5f + 0.5f;
break;
case AudioChannelSet::Surround51:
/* Left */
coefs[0] = (frontPan <= 0.f) ? -frontPan : 0.f;
coefs[0] *= -totalSpan * 0.5f + 0.5f;
/* Right */
coefs[1] = (frontPan >= 0.f) ? frontPan : 0.f;
coefs[1] *= -totalSpan * 0.5f + 0.5f;
/* Back Left */
coefs[2] = -backPan * 0.5f + 0.5f;
coefs[2] *= totalSpan * 0.5f + 0.5f;
/* Back Right */
coefs[3] = backPan * 0.5f + 0.5f;
coefs[3] *= totalSpan * 0.5f + 0.5f;
/* Center */
coefs[4] = 1.f - std::fabs(frontPan);
coefs[4] *= -totalSpan * 0.5f + 0.5f;
/* LFE */
coefs[5] = 1.f;
break;
case AudioChannelSet::Surround71:
/* Left */
coefs[0] = (frontPan <= 0.f) ? -frontPan : 0.f;
coefs[0] *= (totalSpan <= 0.f) ? -totalSpan : 0.f;
/* Right */
coefs[1] = (frontPan >= 0.f) ? frontPan : 0.f;
coefs[1] *= (totalSpan <= 0.f) ? -totalSpan : 0.f;
/* Back Left */
coefs[2] = -backPan * 0.5f + 0.5f;
coefs[2] *= (totalSpan >= 0.f) ? totalSpan : 0.f;
/* Back Right */
coefs[3] = backPan * 0.5f + 0.5f;
coefs[3] *= (totalSpan >= 0.f) ? totalSpan : 0.f;
/* Center */
coefs[4] = 1.f - std::fabs(frontPan);
coefs[4] *= (totalSpan <= 0.f) ? -totalSpan : 0.f;
/* LFE */
coefs[5] = 1.f;
/* Side Left */
coefs[6] = (backPan <= 0.f) ? -backPan : 0.f;
coefs[6] *= 1.f - std::fabs(totalSpan);
/* Side Right */
coefs[7] = (backPan >= 0.f) ? backPan : 0.f;
coefs[7] *= 1.f - std::fabs(totalSpan);
break;
}
}
void Voice::_setPan(float pan)
{
if (m_emitter)
return;
m_curPan = clamp(-1.f, pan, 1.f);
float totalPan = clamp(-1.f, m_curPan + m_userPan, 1.f);
float totalSpan = clamp(-1.f, m_curSpan + m_userSpan, 1.f);
float coefs[8];
/* Left */
coefs[0] = (totalPan <= 0.f) ? 1.f : (1.f - totalPan);
coefs[0] *= (totalSpan <= 0.f) ? 1.f : (1.f - totalSpan);
/* Right */
coefs[1] = (totalPan >= 0.f) ? 1.f : (1.f + totalPan);
coefs[1] *= (totalSpan <= 0.f) ? 1.f : (1.f - totalSpan);
/* Back Left */
coefs[2] = (totalPan <= 0.f) ? 1.f : (1.f - totalPan);
coefs[2] *= (totalSpan >= 0.f) ? 1.f : (1.f + totalSpan);
/* Back Right */
coefs[3] = (totalPan >= 0.f) ? 1.f : (1.f + totalPan);
coefs[3] *= (totalSpan >= 0.f) ? 1.f : (1.f + totalSpan);
/* Center */
coefs[4] = 1.f - std::fabs(totalPan);
/* LFE */
coefs[5] = 1.f;
/* Side Left */
coefs[6] = (totalPan <= 0.f) ? 1.f : (1.f - totalPan);
coefs[6] *= 1.f - std::fabs(totalSpan);
/* Side Right */
coefs[7] = (totalPan >= 0.f) ? 1.f : (1.f + totalPan);
coefs[7] *= 1.f - std::fabs(totalSpan);
m_backendVoice->setChannelLevels(m_studio->getMaster().m_backendSubmix.get(), coefs, true);
m_backendVoice->setChannelLevels(m_studio->getAuxA().m_backendSubmix.get(), coefs, true);
m_backendVoice->setChannelLevels(m_studio->getAuxB().m_backendSubmix.get(), coefs, true);
float coefs[8] = {};
_panLaw(coefs, totalPan, totalPan, totalSpan);
_setChannelCoefs(coefs);
}
void Voice::setPan(float pan)
@@ -1011,6 +1078,20 @@ void Voice::setSurroundPan(float span)
vox->setSurroundPan(span);
}
void Voice::_setChannelCoefs(const float coefs[8])
{
m_backendVoice->setChannelLevels(m_studio->getMaster().m_backendSubmix.get(), coefs, true);
m_backendVoice->setChannelLevels(m_studio->getAuxA().m_backendSubmix.get(), coefs, true);
m_backendVoice->setChannelLevels(m_studio->getAuxB().m_backendSubmix.get(), coefs, true);
}
void Voice::setChannelCoefs(const float coefs[8])
{
_setChannelCoefs(coefs);
for (std::shared_ptr<Voice>& vox : m_childVoices)
vox->setChannelCoefs(coefs);
}
void Voice::startEnvelope(double dur, float vol, const Curve* envCurve)
{
m_envelopeTime = 0.f;