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don't replay last buffer for silent agent

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This commit is contained in:
Stephen Birarda 2013-05-01 10:57:59 -07:00
parent 47f61a2fc2
commit cee73e4622
3 changed files with 117 additions and 123 deletions
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156
audio-mixer/src/main.cpp
View file

@ -92,13 +92,15 @@ void *sendBuffer(void *args)
if (!agentBuffer->isStarted()
&& agentBuffer->diffLastWriteNextOutput() <= BUFFER_LENGTH_SAMPLES_PER_CHANNEL + JITTER_BUFFER_SAMPLES) {
printf("Held back buffer for agent with ID %d.\n", agent->getAgentId());
agentBuffer->setShouldBeAddedToMix(false);
} else if (agentBuffer->diffLastWriteNextOutput() < BUFFER_LENGTH_SAMPLES_PER_CHANNEL) {
printf("Buffer from agent with ID %d starved.\n", agent->getAgentId());
agentBuffer->setStarted(false);
agentBuffer->setShouldBeAddedToMix(false);
} else {
// good buffer, add this to the mix
agentBuffer->setStarted(true);
agentBuffer->setAddedToMix(true);
agentBuffer->setShouldBeAddedToMix(true);
}
}
}
@ -129,89 +131,91 @@ void *sendBuffer(void *args)
if (otherAgent != agent || (otherAgent == agent && agentWantsLoopback)) {
AudioRingBuffer* otherAgentBuffer = (AudioRingBuffer*) otherAgent->getLinkedData();
float *agentPosition = agentRingBuffer->getPosition();
float *otherAgentPosition = otherAgentBuffer->getPosition();
// calculate the distance to the other agent
// use the distance to the other agent to calculate the change in volume for this frame
int lowAgentIndex = std::min(agent.getAgentIndex(), otherAgent.getAgentIndex());
int highAgentIndex = std::max(agent.getAgentIndex(), otherAgent.getAgentIndex());
if (distanceCoeffs[lowAgentIndex][highAgentIndex] == 0) {
float distanceToAgent = sqrtf(powf(agentPosition[0] - otherAgentPosition[0], 2) +
powf(agentPosition[1] - otherAgentPosition[1], 2) +
powf(agentPosition[2] - otherAgentPosition[2], 2));
if (otherAgentBuffer->shouldBeAddedToMix()) {
float *agentPosition = agentRingBuffer->getPosition();
float *otherAgentPosition = otherAgentBuffer->getPosition();
float minCoefficient = std::min(1.0f,
powf(0.5, (logf(DISTANCE_RATIO * distanceToAgent) / logf(3)) - 1));
distanceCoeffs[lowAgentIndex][highAgentIndex] = minCoefficient;
}
// get the angle from the right-angle triangle
float triangleAngle = atan2f(fabsf(agentPosition[2] - otherAgentPosition[2]),
fabsf(agentPosition[0] - otherAgentPosition[0])) * (180 / M_PI);
float angleToSource;
// find the angle we need for calculation based on the orientation of the triangle
if (otherAgentPosition[0] > agentPosition[0]) {
if (otherAgentPosition[2] > agentPosition[2]) {
angleToSource = -90 + triangleAngle - agentBearing;
} else {
angleToSource = -90 - triangleAngle - agentBearing;
// calculate the distance to the other agent
// use the distance to the other agent to calculate the change in volume for this frame
int lowAgentIndex = std::min(agent.getAgentIndex(), otherAgent.getAgentIndex());
int highAgentIndex = std::max(agent.getAgentIndex(), otherAgent.getAgentIndex());
if (distanceCoeffs[lowAgentIndex][highAgentIndex] == 0) {
float distanceToAgent = sqrtf(powf(agentPosition[0] - otherAgentPosition[0], 2) +
powf(agentPosition[1] - otherAgentPosition[1], 2) +
powf(agentPosition[2] - otherAgentPosition[2], 2));
float minCoefficient = std::min(1.0f,
powf(0.5, (logf(DISTANCE_RATIO * distanceToAgent) / logf(3)) - 1));
distanceCoeffs[lowAgentIndex][highAgentIndex] = minCoefficient;
}
} else {
if (otherAgentPosition[2] > agentPosition[2]) {
angleToSource = 90 - triangleAngle - agentBearing;
// get the angle from the right-angle triangle
float triangleAngle = atan2f(fabsf(agentPosition[2] - otherAgentPosition[2]),
fabsf(agentPosition[0] - otherAgentPosition[0])) * (180 / M_PI);
float angleToSource;
// find the angle we need for calculation based on the orientation of the triangle
if (otherAgentPosition[0] > agentPosition[0]) {
if (otherAgentPosition[2] > agentPosition[2]) {
angleToSource = -90 + triangleAngle - agentBearing;
} else {
angleToSource = -90 - triangleAngle - agentBearing;
}
} else {
angleToSource = 90 + triangleAngle - agentBearing;
if (otherAgentPosition[2] > agentPosition[2]) {
angleToSource = 90 - triangleAngle - agentBearing;
} else {
angleToSource = 90 + triangleAngle - agentBearing;
}
}
}
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;
float weakChannelAmplitudeRatio = 1 - (PHASE_AMPLITUDE_RATIO_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()
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;
float weakChannelAmplitudeRatio = 1 - (PHASE_AMPLITUDE_RATIO_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++) {
if (s < numSamplesDelay) {
// pull the earlier sample for the delayed channel
for (int s = 0; s < BUFFER_LENGTH_SAMPLES_PER_CHANNEL; s++) {
int earlierSample = delaySamplePointer[s] *
distanceCoeffs[lowAgentIndex][highAgentIndex] *
otherAgentBuffer->getAttenuationRatio();
if (s < numSamplesDelay) {
// pull the earlier sample for the delayed channel
int earlierSample = delaySamplePointer[s] *
distanceCoeffs[lowAgentIndex][highAgentIndex] *
otherAgentBuffer->getAttenuationRatio();
plateauAdditionOfSamples(delayedChannel[s], earlierSample * weakChannelAmplitudeRatio);
}
plateauAdditionOfSamples(delayedChannel[s], earlierSample * weakChannelAmplitudeRatio);
}
int16_t currentSample = (otherAgentBuffer->getNextOutput()[s] *
distanceCoeffs[lowAgentIndex][highAgentIndex] *
otherAgentBuffer->getAttenuationRatio());
plateauAdditionOfSamples(goodChannel[s], currentSample);
if (s + numSamplesDelay < BUFFER_LENGTH_SAMPLES_PER_CHANNEL) {
plateauAdditionOfSamples(delayedChannel[s + numSamplesDelay],
currentSample *
weakChannelAmplitudeRatio *
int16_t currentSample = (otherAgentBuffer->getNextOutput()[s] *
distanceCoeffs[lowAgentIndex][highAgentIndex] *
otherAgentBuffer->getAttenuationRatio());
plateauAdditionOfSamples(goodChannel[s], currentSample);
if (s + numSamplesDelay < BUFFER_LENGTH_SAMPLES_PER_CHANNEL) {
plateauAdditionOfSamples(delayedChannel[s + numSamplesDelay],
currentSample *
weakChannelAmplitudeRatio *
otherAgentBuffer->getAttenuationRatio());
}
}
}
}
@ -222,14 +226,14 @@ void *sendBuffer(void *args)
for (AgentList::iterator agent = agentList->begin(); agent != agentList->end(); agent++) {
AudioRingBuffer* agentBuffer = (AudioRingBuffer*) agent->getLinkedData();
if (agentBuffer->wasAddedToMix()) {
if (agentBuffer->shouldBeAddedToMix()) {
agentBuffer->setNextOutput(agentBuffer->getNextOutput() + BUFFER_LENGTH_SAMPLES_PER_CHANNEL);
if (agentBuffer->getNextOutput() >= agentBuffer->getBuffer() + RING_BUFFER_SAMPLES) {
agentBuffer->setNextOutput(agentBuffer->getBuffer());
}
agentBuffer->setAddedToMix(false);
agentBuffer->setShouldBeAddedToMix(false);
}
}

14
libraries/shared/src/AudioRingBuffer.cpp
View file

@ -14,7 +14,7 @@ AudioRingBuffer::AudioRingBuffer(int ringSamples, int bufferSamples) {
bufferLengthSamples = bufferSamples;
started = false;
addedToMix = false;
_shouldBeAddedToMix = false;
endOfLastWrite = NULL;
@ -26,7 +26,7 @@ AudioRingBuffer::AudioRingBuffer(const AudioRingBuffer &otherRingBuffer) {
ringBufferLengthSamples = otherRingBuffer.ringBufferLengthSamples;
bufferLengthSamples = otherRingBuffer.bufferLengthSamples;
started = otherRingBuffer.started;
addedToMix = otherRingBuffer.addedToMix;
_shouldBeAddedToMix = otherRingBuffer._shouldBeAddedToMix;
buffer = new int16_t[ringBufferLengthSamples];
memcpy(buffer, otherRingBuffer.buffer, sizeof(int16_t) * ringBufferLengthSamples);
@ -71,14 +71,6 @@ void AudioRingBuffer::setStarted(bool status) {
started = status;
}
bool AudioRingBuffer::wasAddedToMix() {
return addedToMix;
}
void AudioRingBuffer::setAddedToMix(bool added) {
addedToMix = added;
}
float* AudioRingBuffer::getPosition() {
return position;
}
@ -136,8 +128,6 @@ int AudioRingBuffer::parseData(unsigned char* sourceBuffer, int numBytes) {
endOfLastWrite += bufferLengthSamples;
addedToMix = false;
if (endOfLastWrite >= buffer + ringBufferLengthSamples) {
endOfLastWrite = buffer;
}

70
libraries/shared/src/AudioRingBuffer.h
View file

@ -13,42 +13,42 @@
#include "AgentData.h"
class AudioRingBuffer : public AgentData {
public:
AudioRingBuffer(int ringSamples, int bufferSamples);
~AudioRingBuffer();
AudioRingBuffer(const AudioRingBuffer &otherRingBuffer);
int parseData(unsigned char* sourceBuffer, int numBytes);
AudioRingBuffer* clone() const;
public:
AudioRingBuffer(int ringSamples, int bufferSamples);
~AudioRingBuffer();
AudioRingBuffer(const AudioRingBuffer &otherRingBuffer);
int16_t* getNextOutput();
void setNextOutput(int16_t *newPointer);
int16_t* getEndOfLastWrite();
void setEndOfLastWrite(int16_t *newPointer);
int16_t* getBuffer();
bool isStarted();
void setStarted(bool status);
bool wasAddedToMix();
void setAddedToMix(bool added);
float* getPosition();
void setPosition(float newPosition[]);
float getAttenuationRatio();
void setAttenuationRatio(float newAttenuation);
float getBearing();
void setBearing(float newBearing);
short diffLastWriteNextOutput();
private:
int ringBufferLengthSamples;
int bufferLengthSamples;
float position[3];
float attenuationRatio;
float bearing;
int16_t *nextOutput;
int16_t *endOfLastWrite;
int16_t *buffer;
bool started;
bool addedToMix;
int parseData(unsigned char* sourceBuffer, int numBytes);
AudioRingBuffer* clone() const;
int16_t* getNextOutput();
void setNextOutput(int16_t *newPointer);
int16_t* getEndOfLastWrite();
void setEndOfLastWrite(int16_t *newPointer);
int16_t* getBuffer();
bool isStarted();
void setStarted(bool status);
bool shouldBeAddedToMix() const { return _shouldBeAddedToMix; }
void setShouldBeAddedToMix(bool shouldBeAddedToMix) { _shouldBeAddedToMix = shouldBeAddedToMix; }
float* getPosition();
void setPosition(float newPosition[]);
float getAttenuationRatio();
void setAttenuationRatio(float newAttenuation);
float getBearing();
void setBearing(float newBearing);
short diffLastWriteNextOutput();
private:
int ringBufferLengthSamples;
int bufferLengthSamples;
float position[3];
float attenuationRatio;
float bearing;
int16_t *nextOutput;
int16_t *endOfLastWrite;
int16_t *buffer;
bool started;
bool _shouldBeAddedToMix;
};
#endif /* defined(__interface__AudioRingBuffer__) */