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cap distance amplification at 1, create spatialized mix

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This commit is contained in:
Stephen Birarda 2013-03-01 12:33:24 -08:00
parent 400cb238f2
commit c23b5ff785
1 changed files with 36 additions and 6 deletions
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42
mixer/src/main.cpp
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@ -35,6 +35,7 @@ const long MAX_SAMPLE_VALUE = std::numeric_limits<int16_t>::max();
const long MIN_SAMPLE_VALUE = std::numeric_limits<int16_t>::min();
const float DISTANCE_RATIO = 3.0/4.2;
const int PHASE_DELAY_AT_90 = 20;
char DOMAIN_HOSTNAME[] = "highfidelity.below92.com";
char DOMAIN_IP[100] = ""; // IP Address will be re-set by lookup on startup
@ -69,7 +70,6 @@ void *sendBuffer(void *args)
agentBuffer->setStarted(true);
agentBuffer->setAddedToMix(true);
}
}
}
@ -79,13 +79,13 @@ void *sendBuffer(void *args)
int16_t clientMix[BUFFER_LENGTH_SAMPLES_PER_CHANNEL * 2] = {};
for (int j = 0; j < agentList.getAgents().size(); j++) {
if (i == j) {
if (i != j) {
AudioRingBuffer *agentRingBuffer = (AudioRingBuffer *) agent->getLinkedData();
AudioRingBuffer *otherAgentBuffer = (AudioRingBuffer *)agentList.getAgents()[j].getLinkedData();
float *agentPosition = agentRingBuffer->getPosition();
float otherAgentPosition[3] = {0,0,0};
float *otherAgentPosition = otherAgentBuffer->getPosition();
// calculate the distance to the other agent
float distanceToAgent = sqrtf(powf(agentPosition[0] - otherAgentPosition[0], 2) +
@ -93,6 +93,7 @@ void *sendBuffer(void *args)
powf(agentPosition[2] - otherAgentPosition[2], 2));
// use the distance to the other agent to calculate the change in volume for this frame
float distanceCoeff = powf((logf(DISTANCE_RATIO * distanceToAgent) / logf(3)), 2);
distanceCoeff = std::max(1.0f, distanceCoeff);
// get the angle from the right-angle triangle
float triangleAngle = atan2f(fabsf(agentPosition[2] - otherAgentPosition[2]), fabsf(agentPosition[0] - otherAgentPosition[0])) * (180 / M_PI);
@ -115,10 +116,39 @@ void *sendBuffer(void *args)
}
}
if (angleToSource > 180) {
angleToSource -= 360;
} else if (angleToSource < -180) {
angleToSource += 360;
}
angleToSource *= (M_PI / 180);
float sinRatio = fabsf(sinf(angleToSource));
int numSamplesDelay = PHASE_DELAY_AT_90 * sinRatio;
int16_t *goodChannel = angleToSource > 0 ? clientMix + BUFFER_LENGTH_SAMPLES_PER_CHANNEL : clientMix;
int16_t *delayedChannel = angleToSource > 0 ? clientMix : clientMix + BUFFER_LENGTH_SAMPLES_PER_CHANNEL;
int16_t *delaySamplePointer = otherAgentBuffer->getNextOutput() == otherAgentBuffer->getBuffer()
? otherAgentBuffer->getBuffer() + RING_BUFFER_SAMPLES - numSamplesDelay
: otherAgentBuffer->getNextOutput() - numSamplesDelay;
for (int s = 0; s < BUFFER_LENGTH_SAMPLES_PER_CHANNEL; s++) {
int16_t sample = (otherAgentBuffer->getNextOutput()[s] / distanceCoeff);
clientMix[s] += sample;
clientMix[s + BUFFER_LENGTH_SAMPLES_PER_CHANNEL] += sample;
if (s < numSamplesDelay) {
// pull the earlier sample for the delayed channel
int earlierSample = delaySamplePointer[s] / distanceCoeff;
delayedChannel[s] = earlierSample;
}
int16_t currentSample = (otherAgentBuffer->getNextOutput()[s] / distanceCoeff);
goodChannel[s] = currentSample;
if (s + numSamplesDelay < BUFFER_LENGTH_SAMPLES_PER_CHANNEL) {
delayedChannel[s + numSamplesDelay] = currentSample;
}
}
}
}