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an initial version of distance reverb

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Stephen Birarda 2013-05-30 15:21:07 -07:00
parent a289692215
commit 787835e86d
1 changed files with 48 additions and 20 deletions
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68
audio-mixer/src/main.cpp
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@ -79,6 +79,11 @@ void attachNewBufferToAgent(Agent *newAgent) {
}
}
struct SharedAudioFactors {
float distanceCoefficient;
float effectMix;
};
int main(int argc, const char* argv[]) {
setvbuf(stdout, NULL, _IOLBF, 0);
@ -106,12 +111,15 @@ int main(int argc, const char* argv[]) {
int16_t clientSamples[BUFFER_LENGTH_SAMPLES_PER_CHANNEL * 2] = {};
// setup STK for the reverb effect
// setup STK for the reverb effect
const float DISTANCE_REVERB_DAMPING = 0.8f;
const float DISTANCE_REVERB_ROOM_SIZE = 1.0f;
const float DISTANCE_REVERB_WIDTH = 0.5f;
stk::FreeVerb freeVerb;
freeVerb.setEffectMix(0.5f);
freeVerb.setDamping(0.5f);
freeVerb.setRoomSize(0.5f);
freeVerb.setWidth(0.5f);
freeVerb.setDamping(DISTANCE_REVERB_DAMPING);
freeVerb.setRoomSize(DISTANCE_REVERB_ROOM_SIZE);
freeVerb.setWidth(DISTANCE_REVERB_WIDTH);
gettimeofday(&startTime, NULL);
@ -138,8 +146,8 @@ int main(int argc, const char* argv[]) {
}
int numAgents = agentList->size();
float distanceCoefficients[numAgents][numAgents];
memset(distanceCoefficients, 0, sizeof(distanceCoefficients));
SharedAudioFactors audioFactors[numAgents][numAgents];
memset(audioFactors, 0, sizeof(audioFactors));
for (AgentList::iterator agent = agentList->begin(); agent != agentList->end(); agent++) {
if (agent->getType() == AGENT_TYPE_AVATAR) {
@ -159,6 +167,9 @@ int main(int argc, const char* argv[]) {
int numSamplesDelay = 0;
float weakChannelAmplitudeRatio = 1.f;
// echo effect mix is 0
freeVerb.setEffectMix(0.0f);
if (otherAgent != agent) {
glm::vec3 agentPosition = agentRingBuffer->getPosition();
glm::vec3 otherAgentPosition = otherAgentBuffer->getPosition();
@ -169,7 +180,10 @@ int main(int argc, const char* argv[]) {
int lowAgentIndex = std::min(agent.getAgentIndex(), otherAgent.getAgentIndex());
int highAgentIndex = std::max(agent.getAgentIndex(), otherAgent.getAgentIndex());
if (distanceCoefficients[lowAgentIndex][highAgentIndex] == 0) {
const float DISTANCE_REVERB_LOG_REMAINDER = 0.32f;
const float DISTANCE_REVERB_MAX_WETNESS = 1.0f;
if (audioFactors[lowAgentIndex][highAgentIndex].distanceCoefficient == 0) {
float distanceToAgent = sqrtf(powf(agentPosition.x - otherAgentPosition.x, 2) +
powf(agentPosition.y - otherAgentPosition.y, 2) +
powf(agentPosition.z - otherAgentPosition.z, 2));
@ -178,7 +192,16 @@ int main(int argc, const char* argv[]) {
powf(0.3,
(logf(DISTANCE_SCALE * distanceToAgent) / logf(2.5))
- 1));
distanceCoefficients[lowAgentIndex][highAgentIndex] = minCoefficient;
audioFactors[lowAgentIndex][highAgentIndex].distanceCoefficient = minCoefficient;
float effectMix = powf(2.0f,
(logf(distanceToAgent) / logf(2.0f) - DISTANCE_REVERB_LOG_REMAINDER)
* DISTANCE_REVERB_MAX_WETNESS);
audioFactors[lowAgentIndex][highAgentIndex].effectMix = (effectMix / 32.0f);
// printf("DA: %f, EM: %f\n", distanceToAgent, effectMix / 32.0f);
}
@ -222,10 +245,12 @@ int main(int argc, const char* argv[]) {
float offAxisCoefficient = MAX_OFF_AXIS_ATTENUATION +
(OFF_AXIS_ATTENUATION_FORMULA_STEP * (fabsf(angleOfDelivery) / 90.0f));
attenuationCoefficient = distanceCoefficients[lowAgentIndex][highAgentIndex]
attenuationCoefficient = audioFactors[lowAgentIndex][highAgentIndex].distanceCoefficient
* otherAgentBuffer->getAttenuationRatio()
* offAxisCoefficient;
freeVerb.setEffectMix(audioFactors[lowAgentIndex][highAgentIndex].effectMix);
bearingRelativeAngleToSource *= (M_PI / 180);
float sinRatio = fabsf(sinf(bearingRelativeAngleToSource));
@ -244,15 +269,25 @@ int main(int argc, const char* argv[]) {
? otherAgentBuffer->getBuffer() + RING_BUFFER_SAMPLES - numSamplesDelay
: otherAgentBuffer->getNextOutput() - numSamplesDelay;
for (int s = 0; s < BUFFER_LENGTH_SAMPLES_PER_CHANNEL; s++) {
if (s < numSamplesDelay) {
// pull the earlier sample for the delayed channel
int earlierSample = delaySamplePointer[s] * attenuationCoefficient;
plateauAdditionOfSamples(delayedChannel[s], earlierSample * weakChannelAmplitudeRatio);
int earlierSample = delaySamplePointer[s]
* attenuationCoefficient
* weakChannelAmplitudeRatio;
// apply the STK FreeVerb effect
earlierSample = freeVerb.tick(earlierSample);
plateauAdditionOfSamples(delayedChannel[s], earlierSample);
}
int16_t currentSample = (otherAgentBuffer->getNextOutput()[s] * attenuationCoefficient);
// apply the STK FreeVerb effect
currentSample = freeVerb.tick(currentSample);
plateauAdditionOfSamples(goodChannel[s], currentSample);
if (s + numSamplesDelay < BUFFER_LENGTH_SAMPLES_PER_CHANNEL) {
@ -264,13 +299,6 @@ int main(int argc, const char* argv[]) {
}
}
// apply the FreeVerb to the clientSamples array
for (int s = 0; s < BUFFER_LENGTH_SAMPLES_PER_CHANNEL; s++) {
clientSamples[s] = freeVerb.tick(clientSamples[s],
clientSamples[s + BUFFER_LENGTH_SAMPLES_PER_CHANNEL]);
clientSamples[s + BUFFER_LENGTH_SAMPLES_PER_CHANNEL] = freeVerb.lastOut(1);
}
memcpy(clientPacket + 1, clientSamples, sizeof(clientSamples));
agentList->getAgentSocket()->send(agent->getPublicSocket(), clientPacket, BUFFER_LENGTH_BYTES + 1);
}