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add a TwoPole low pass filter for each source for each listener

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This commit is contained in:
Stephen Birarda 2013-06-11 15:01:35 -07:00
parent 84422628a9
commit 2cc44c6d2e
1 changed files with 25 additions and 0 deletions

25
audio-mixer/src/main.cpp
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@ -136,6 +136,8 @@ int main(int argc, const char* argv[]) {
int numSamplesDelay = 0;
float weakChannelAmplitudeRatio = 1.0f;
stk::TwoPole* otherAgentTwoPole = NULL;
if (otherAgent != agent) {
glm::vec3 listenerPosition = agentRingBuffer->getPosition();
@ -212,6 +214,25 @@ int main(int argc, const char* argv[]) {
float sinRatio = fabsf(sinf(glm::radians(bearingRelativeAngleToSource)));
numSamplesDelay = PHASE_DELAY_AT_90 * sinRatio;
weakChannelAmplitudeRatio = 1 - (PHASE_AMPLITUDE_RATIO_AT_90 * sinRatio);
// grab the TwoPole object for this source, add it if it doesn't exist
TwoPoleAgentMap& agentTwoPoles = agentRingBuffer->getTwoPoles();
TwoPoleAgentMap::iterator twoPoleIterator = agentTwoPoles.find(otherAgent->getAgentID());
if (twoPoleIterator == agentTwoPoles.end()) {
// setup the freeVerb effect for this source for this client
otherAgentTwoPole = agentTwoPoles[otherAgent->getAgentID()] = new stk::TwoPole;
} else {
otherAgentTwoPole = twoPoleIterator->second;
}
// calculate the reasonance for this TwoPole based on angle to source
float TWO_POLE_CUT_OFF_FREQUENCY = 1000.0f;
float TWO_POLE_MAX_FILTER_STRENGTH = 0.4f;
otherAgentTwoPole->setResonance(TWO_POLE_CUT_OFF_FREQUENCY,
TWO_POLE_MAX_FILTER_STRENGTH
* fabsf(bearingRelativeAngleToSource) / 180.0f);
}
}
@ -237,6 +258,10 @@ int main(int argc, const char* argv[]) {
plateauAdditionOfSamples(delayedChannel[s], earlierSample);
}
if (otherAgentTwoPole) {
otherAgentBuffer->getNextOutput()[s] = otherAgentTwoPole->tick(otherAgentBuffer->getNextOutput()[s]);
}
int16_t currentSample = otherAgentBuffer->getNextOutput()[s] * attenuationCoefficient;
plateauAdditionOfSamples(goodChannel[s], currentSample);