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attach stream identifier to AudioRingBuffer to match incoming data in audio mixer

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This commit is contained in:
Stephen Birarda 2013-05-17 14:57:10 -07:00
parent b7b39c2a6e
commit d72b931ebe
6 changed files with 159 additions and 120 deletions
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7
audio-mixer/CMakeLists.txt
View file

@ -3,11 +3,18 @@ cmake_minimum_required(VERSION 2.8)
set(ROOT_DIR ..)
set(MACRO_DIR ${ROOT_DIR}/cmake/macros)
# setup for find modules
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/../cmake/modules/")
set(TARGET_NAME audio-mixer)
include(${MACRO_DIR}/SetupHifiProject.cmake)
setup_hifi_project(${TARGET_NAME})
# set up the external glm library
include(${MACRO_DIR}/IncludeGLM.cmake)
include_glm(${TARGET_NAME} ${ROOT_DIR})
# link the shared hifi library
include(${MACRO_DIR}/LinkHifiLibrary.cmake)
link_hifi_library(shared ${TARGET_NAME} ${ROOT_DIR})

228
audio-mixer/src/main.cpp
View file

@ -133,128 +133,130 @@ int main(int argc, const char* argv[]) {
memset(distanceCoefficients, 0, sizeof(distanceCoefficients));
for (AgentList::iterator agent = agentList->begin(); agent != agentList->end(); agent++) {
AudioRingBuffer* agentRingBuffer = (AudioRingBuffer*) agent->getLinkedData();
// zero out the client mix for this agent
memset(clientSamples, 0, sizeof(clientSamples));
for (AgentList::iterator otherAgent = agentList->begin(); otherAgent != agentList->end(); otherAgent++) {
if (otherAgent != agent || (otherAgent == agent && agentRingBuffer->shouldLoopbackForAgent())) {
AudioRingBuffer* otherAgentBuffer = (AudioRingBuffer*) otherAgent->getLinkedData();
if (otherAgentBuffer->shouldBeAddedToMix()) {
if (agent->getType() == AGENT_TYPE_AVATAR) {
AudioRingBuffer* agentRingBuffer = (AudioRingBuffer*) agent->getLinkedData();
// zero out the client mix for this agent
memset(clientSamples, 0, sizeof(clientSamples));
for (AgentList::iterator otherAgent = agentList->begin(); otherAgent != agentList->end(); otherAgent++) {
if (otherAgent != agent || (otherAgent == agent && agentRingBuffer->shouldLoopbackForAgent())) {
AudioRingBuffer* otherAgentBuffer = (AudioRingBuffer*) otherAgent->getLinkedData();
float bearingRelativeAngleToSource = 0.f;
float attenuationCoefficient = 1.f;
int numSamplesDelay = 0;
float weakChannelAmplitudeRatio = 1.f;
if (otherAgent != agent) {
Position agentPosition = agentRingBuffer->getPosition();
Position otherAgentPosition = otherAgentBuffer->getPosition();
if (otherAgentBuffer->shouldBeAddedToMix()) {
// calculate the distance to the other agent
float bearingRelativeAngleToSource = 0.f;
float attenuationCoefficient = 1.f;
int numSamplesDelay = 0;
float weakChannelAmplitudeRatio = 1.f;
// 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 (distanceCoefficients[lowAgentIndex][highAgentIndex] == 0) {
float distanceToAgent = sqrtf(powf(agentPosition.x - otherAgentPosition.x, 2) +
powf(agentPosition.y - otherAgentPosition.y, 2) +
powf(agentPosition.z - otherAgentPosition.z, 2));
if (otherAgent != agent) {
glm::vec3 agentPosition = agentRingBuffer->getPosition();
glm::vec3 otherAgentPosition = otherAgentBuffer->getPosition();
float minCoefficient = std::min(1.0f,
powf(0.5,
(logf(DISTANCE_RATIO * distanceToAgent) / logf(3)) - 1));
distanceCoefficients[lowAgentIndex][highAgentIndex] = minCoefficient;
}
// get the angle from the right-angle triangle
float triangleAngle = atan2f(fabsf(agentPosition.z - otherAgentPosition.z),
fabsf(agentPosition.x - otherAgentPosition.x)) * (180 / M_PI);
float absoluteAngleToSource = 0;
bearingRelativeAngleToSource = 0;
// find the angle we need for calculation based on the orientation of the triangle
if (otherAgentPosition.x > agentPosition.x) {
if (otherAgentPosition.z > agentPosition.z) {
absoluteAngleToSource = -90 + triangleAngle;
} else {
absoluteAngleToSource = -90 - triangleAngle;
// 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 (distanceCoefficients[lowAgentIndex][highAgentIndex] == 0) {
float distanceToAgent = sqrtf(powf(agentPosition.x - otherAgentPosition.x, 2) +
powf(agentPosition.y - otherAgentPosition.y, 2) +
powf(agentPosition.z - otherAgentPosition.z, 2));
float minCoefficient = std::min(1.0f,
powf(0.5,
(logf(DISTANCE_RATIO * distanceToAgent) / logf(3)) - 1));
distanceCoefficients[lowAgentIndex][highAgentIndex] = minCoefficient;
}
} else {
if (otherAgentPosition.z > agentPosition.z) {
absoluteAngleToSource = 90 - triangleAngle;
// get the angle from the right-angle triangle
float triangleAngle = atan2f(fabsf(agentPosition.z - otherAgentPosition.z),
fabsf(agentPosition.x - otherAgentPosition.x)) * (180 / M_PI);
float absoluteAngleToSource = 0;
bearingRelativeAngleToSource = 0;
// find the angle we need for calculation based on the orientation of the triangle
if (otherAgentPosition.x > agentPosition.x) {
if (otherAgentPosition.z > agentPosition.z) {
absoluteAngleToSource = -90 + triangleAngle;
} else {
absoluteAngleToSource = -90 - triangleAngle;
}
} else {
absoluteAngleToSource = 90 + triangleAngle;
if (otherAgentPosition.z > agentPosition.z) {
absoluteAngleToSource = 90 - triangleAngle;
} else {
absoluteAngleToSource = 90 + triangleAngle;
}
}
bearingRelativeAngleToSource = absoluteAngleToSource - agentRingBuffer->getBearing();
if (bearingRelativeAngleToSource > 180) {
bearingRelativeAngleToSource -= 360;
} else if (bearingRelativeAngleToSource < -180) {
bearingRelativeAngleToSource += 360;
}
float angleOfDelivery = absoluteAngleToSource - otherAgentBuffer->getBearing();
if (angleOfDelivery > 180) {
angleOfDelivery -= 360;
} else if (angleOfDelivery < -180) {
angleOfDelivery += 360;
}
float offAxisCoefficient = MAX_OFF_AXIS_ATTENUATION +
(OFF_AXIS_ATTENUATION_FORMULA_STEP * (fabsf(angleOfDelivery) / 90.0f));
attenuationCoefficient = distanceCoefficients[lowAgentIndex][highAgentIndex]
* otherAgentBuffer->getAttenuationRatio()
* offAxisCoefficient;
bearingRelativeAngleToSource *= (M_PI / 180);
float sinRatio = fabsf(sinf(bearingRelativeAngleToSource));
numSamplesDelay = PHASE_DELAY_AT_90 * sinRatio;
weakChannelAmplitudeRatio = 1 - (PHASE_AMPLITUDE_RATIO_AT_90 * sinRatio);
}
bearingRelativeAngleToSource = absoluteAngleToSource - agentRingBuffer->getBearing();
if (bearingRelativeAngleToSource > 180) {
bearingRelativeAngleToSource -= 360;
} else if (bearingRelativeAngleToSource < -180) {
bearingRelativeAngleToSource += 360;
}
float angleOfDelivery = absoluteAngleToSource - otherAgentBuffer->getBearing();
if (angleOfDelivery > 180) {
angleOfDelivery -= 360;
} else if (angleOfDelivery < -180) {
angleOfDelivery += 360;
}
float offAxisCoefficient = MAX_OFF_AXIS_ATTENUATION +
(OFF_AXIS_ATTENUATION_FORMULA_STEP * (fabsf(angleOfDelivery) / 90.0f));
attenuationCoefficient = distanceCoefficients[lowAgentIndex][highAgentIndex]
* otherAgentBuffer->getAttenuationRatio()
* offAxisCoefficient;
bearingRelativeAngleToSource *= (M_PI / 180);
float sinRatio = fabsf(sinf(bearingRelativeAngleToSource));
numSamplesDelay = PHASE_DELAY_AT_90 * sinRatio;
weakChannelAmplitudeRatio = 1 - (PHASE_AMPLITUDE_RATIO_AT_90 * sinRatio);
}
int16_t* goodChannel = bearingRelativeAngleToSource > 0.0f
int16_t* goodChannel = bearingRelativeAngleToSource > 0.0f
? clientSamples + BUFFER_LENGTH_SAMPLES_PER_CHANNEL
: clientSamples;
int16_t* delayedChannel = bearingRelativeAngleToSource > 0.0f
int16_t* delayedChannel = bearingRelativeAngleToSource > 0.0f
? clientSamples
: clientSamples + BUFFER_LENGTH_SAMPLES_PER_CHANNEL;
int16_t* delaySamplePointer = otherAgentBuffer->getNextOutput() == otherAgentBuffer->getBuffer()
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
int earlierSample = delaySamplePointer[s] * attenuationCoefficient;
plateauAdditionOfSamples(delayedChannel[s], earlierSample * weakChannelAmplitudeRatio);
}
int16_t currentSample = (otherAgentBuffer->getNextOutput()[s] * attenuationCoefficient);
plateauAdditionOfSamples(goodChannel[s], currentSample);
if (s + numSamplesDelay < BUFFER_LENGTH_SAMPLES_PER_CHANNEL) {
plateauAdditionOfSamples(delayedChannel[s + numSamplesDelay],
currentSample * weakChannelAmplitudeRatio);
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);
}
int16_t currentSample = (otherAgentBuffer->getNextOutput()[s] * attenuationCoefficient);
plateauAdditionOfSamples(goodChannel[s], currentSample);
if (s + numSamplesDelay < BUFFER_LENGTH_SAMPLES_PER_CHANNEL) {
plateauAdditionOfSamples(delayedChannel[s + numSamplesDelay],
currentSample * weakChannelAmplitudeRatio);
}
}
}
}
}
memcpy(clientPacket + 1, clientSamples, sizeof(clientSamples));
agentList->getAgentSocket()->send(agent->getPublicSocket(), clientPacket, BUFFER_LENGTH_BYTES + 1);
}
memcpy(clientPacket + 1, clientSamples, sizeof(clientSamples));
agentList->getAgentSocket()->send(agent->getPublicSocket(), clientPacket, BUFFER_LENGTH_BYTES + 1);
}
// push forward the next output pointers for any audio buffers we used
@ -285,8 +287,30 @@ int main(int argc, const char* argv[]) {
agentList->updateAgentWithData(agentAddress, packetData, receivedBytes);
} else if (packetData[0] == PACKET_HEADER_INJECT_AUDIO) {
Agent* matchingInjector = NULL;
// this is an injector stream - check our map to see if we have it already
for (AgentList::iterator agent = agentList->begin(); agent != agentList->end(); agent++) {
if (agent->getLinkedData()) {
AudioRingBuffer* ringBuffer = (AudioRingBuffer*) agent->getLinkedData();
if (memcmp(ringBuffer->getStreamIdentifier(), packetData + 1, sizeof(STREAM_IDENTIFIER_NUM_BYTES))) {
// this is the matching stream, assign to matchingInjector and stop looking
matchingInjector = &*agent;
break;
}
}
}
if (!matchingInjector) {
matchingInjector = agentList->addOrUpdateAgent(NULL,
NULL,
AGENT_TYPE_AUDIO_INJECTOR,
agentList->getLastAgentID());
agentList->increaseAgentID();
}
// give the new audio data to the matching injector agent
agentList->updateAgentWithData(matchingInjector, packetData, receivedBytes);
}
}

12
libraries/audio/src/AudioInjector.cpp
View file

@ -24,7 +24,7 @@ AudioInjector::AudioInjector(const char* filename) :
_indexOfNextSlot(0),
_isInjectingAudio(false)
{
loadRandomIdentifier(_identifier, INJECTOR_IDENTIFIER_NUM_BYTES);
loadRandomIdentifier(_streamIdentifier, STREAM_IDENTIFIER_NUM_BYTES);
std::fstream sourceFile;
@ -53,7 +53,7 @@ AudioInjector::AudioInjector(int maxNumSamples) :
_indexOfNextSlot(0),
_isInjectingAudio(false)
{
loadRandomIdentifier(_identifier, INJECTOR_IDENTIFIER_NUM_BYTES);
loadRandomIdentifier(_streamIdentifier, STREAM_IDENTIFIER_NUM_BYTES);
_audioSampleArray = new int16_t[maxNumSamples];
memset(_audioSampleArray, 0, _numTotalSamples * sizeof(int16_t));
@ -76,6 +76,10 @@ void AudioInjector::injectAudio(UDPSocket* injectorSocket, sockaddr* destination
dataPacket[0] = PACKET_HEADER_INJECT_AUDIO;
unsigned char *currentPacketPtr = dataPacket + 1;
// copy the identifier for this injector
memcpy(currentPacketPtr, &_streamIdentifier, sizeof(_streamIdentifier));
currentPacketPtr += sizeof(_streamIdentifier);
memcpy(currentPacketPtr, &_position, sizeof(_position));
currentPacketPtr += sizeof(_position);
@ -85,10 +89,6 @@ void AudioInjector::injectAudio(UDPSocket* injectorSocket, sockaddr* destination
memcpy(currentPacketPtr, &_bearing, sizeof(_bearing));
currentPacketPtr += sizeof(_bearing);
// copy the identifier for this injector
memcpy(currentPacketPtr, &_identifier, sizeof(_identifier));
currentPacketPtr += sizeof(_identifier);
for (int i = 0; i < _numTotalSamples; i += BUFFER_LENGTH_SAMPLES) {
gettimeofday(&startTime, NULL);

6
libraries/audio/src/AudioInjector.h
View file

@ -13,13 +13,13 @@
#include <glm/glm.hpp>
#include "AudioRingBuffer.h"
const int BUFFER_LENGTH_BYTES = 512;
const int BUFFER_LENGTH_SAMPLES = BUFFER_LENGTH_BYTES / sizeof(int16_t);
const float SAMPLE_RATE = 22050.0f;
const float BUFFER_SEND_INTERVAL_USECS = (BUFFER_LENGTH_SAMPLES / SAMPLE_RATE) * 1000000;
const int INJECTOR_IDENTIFIER_NUM_BYTES = 8;
class AudioInjector {
public:
AudioInjector(const char* filename);
@ -43,7 +43,7 @@ public:
void addSample(const int16_t sample);
void addSamples(int16_t* sampleBuffer, int numSamples);
private:
unsigned char _identifier[INJECTOR_IDENTIFIER_NUM_BYTES];
unsigned char _streamIdentifier[STREAM_IDENTIFIER_NUM_BYTES];
int16_t* _audioSampleArray;
int _numTotalSamples;
glm::vec3 _position;

11
libraries/audio/src/AudioRingBuffer.cpp
View file

@ -18,8 +18,9 @@ AudioRingBuffer::AudioRingBuffer(int ringSamples, int bufferSamples) :
_endOfLastWrite(NULL),
_started(false),
_shouldBeAddedToMix(false),
_shouldLoopbackForAgent(false) {
_shouldLoopbackForAgent(false),
_streamIdentifier()
{
_buffer = new int16_t[_ringBufferLengthSamples];
_nextOutput = _buffer;
};
@ -39,6 +40,12 @@ int AudioRingBuffer::parseData(unsigned char* sourceBuffer, int numBytes) {
// if this came from an injector or interface client
// there's data required for spatialization to pull out
if (sourceBuffer[0] == PACKET_HEADER_INJECT_AUDIO) {
// we've got a stream identifier to pull from the packet
memcpy(&_streamIdentifier, dataBuffer, sizeof(_streamIdentifier));
dataBuffer += sizeof(_streamIdentifier);
}
memcpy(&_position, dataBuffer, sizeof(_position));
dataBuffer += (sizeof(_position));

15
libraries/audio/src/AudioRingBuffer.h
View file

@ -10,13 +10,12 @@
#define __interface__AudioRingBuffer__
#include <stdint.h>
#include <glm/glm.hpp>
#include "AgentData.h"
struct Position {
float x;
float y;
float z;
};
const int STREAM_IDENTIFIER_NUM_BYTES = 8;
class AudioRingBuffer : public AgentData {
public:
@ -39,10 +38,11 @@ public:
bool shouldBeAddedToMix() const { return _shouldBeAddedToMix; }
void setShouldBeAddedToMix(bool shouldBeAddedToMix) { _shouldBeAddedToMix = shouldBeAddedToMix; }
const Position& getPosition() const { return _position; }
const glm::vec3& getPosition() const { return _position; }
float getAttenuationRatio() const { return _attenuationRatio; }
float getBearing() const { return _bearing; }
bool shouldLoopbackForAgent() const { return _shouldLoopbackForAgent; }
const unsigned char* getStreamIdentifier() const { return _streamIdentifier; }
short diffLastWriteNextOutput();
private:
@ -52,7 +52,7 @@ private:
int _ringBufferLengthSamples;
int _bufferLengthSamples;
Position _position;
glm::vec3 _position;
float _attenuationRatio;
float _bearing;
int16_t* _nextOutput;
@ -61,6 +61,7 @@ private:
bool _started;
bool _shouldBeAddedToMix;
bool _shouldLoopbackForAgent;
unsigned char _streamIdentifier[STREAM_IDENTIFIER_NUM_BYTES];
};
#endif /* defined(__interface__AudioRingBuffer__) */