Mirrors/overte
3
0
Fork 0
mirror of https://github.com/overte-org/overte.git synced 2025-04-25 20:36:38 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

new head penumbra gain calculations

Browse source
This commit is contained in:
Craig Hansen-Sturm 2014-09-12 18:31:33 -07:00
parent 8428b1a4ba
commit 2f8ef6b4fb
1 changed files with 56 additions and 36 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

92
assignment-client/src/audio/AudioMixer.cpp
View file

@ -315,53 +315,73 @@ int AudioMixer::addStreamToMixForListeningNodeWithStream(PositionalAudioStream*
rotatedSourcePosition.y = 0.0f; rotatedSourcePosition.y = 0.0f;
// produce an oriented angle about the y-axis // produce an oriented angle about the y-axis
bearingRelativeAngleToSource = glm::orientedAngle(glm::vec3(0.0f, 0.0f, -1.0f), float bearingAngleToSource = glm::orientedAngle(glm::vec3(0.0f, 0.0f, -1.0f),
glm::normalize(rotatedSourcePosition), glm::normalize(rotatedSourcePosition),
glm::vec3(0.0f, 1.0f, 0.0f)); glm::vec3(0.0f, -1.0f, 0.0f));
const float TWO_OVER_PI = 2.0f / PI;
// if the source is in the range (-pi/2,+pi/2) (e.g, -Z from the listener's perspective const float ZERO_DB = 1.0f;
if (bearingRelativeAngleToSource < -PI_OVER_TWO || bearingRelativeAngleToSource > PI_OVER_TWO) const float NEGATIVE_ONE_DB = 0.891f;
{ const float NEGATIVE_THREE_DB = 0.708f;
AudioFilterHSF1s& penumbraFilter = streamToAdd->getFilter();
const float FULL_POWER = 1.0f; const float FILTER_CUTOFF_FREQUENCY_HZ = 1000.0f;
const float SQUARE_ROOT_OF_TWO_OVER_TWO = 0.71f;
const float HALF_POWER = SQUARE_ROOT_OF_TWO_OVER_TWO; const float penumbraFilterFrequency = FILTER_CUTOFF_FREQUENCY_HZ; // constant frequency
const float penumbraFilterSlope = NEGATIVE_THREE_DB; // constant slope
const float ONE_OVER_TWO_PI = 1.0f / TWO_PI;
const float FILTER_CUTOFF_FREQUENCY_HZ = 1000.0f; float penumbraFilterGainL;
float penumbraFilterGainR;
// calculate the updated gain, frequency and slope.
const float penumbraFilterFrequency = FILTER_CUTOFF_FREQUENCY_HZ; // constant frequency // variable gain calculation broken down by quadrent
const float penumbraFilterSlope = SQUARE_ROOT_OF_TWO_OVER_TWO; // constant slope if (bearingAngleToSource < -PI_OVER_TWO && bearingAngleToSource > -PI) {
// gainL(-pi/2,0b)->(-pi,-1db)
penumbraFilterGainL = TWO_OVER_PI *
(ZERO_DB - NEGATIVE_ONE_DB) * (bearingAngleToSource + PI_OVER_TWO) + ZERO_DB;
// gainR(-pi/2,-3db)->(-pi,-1db)
penumbraFilterGainR = TWO_OVER_PI *
(NEGATIVE_THREE_DB - NEGATIVE_ONE_DB) * (bearingAngleToSource + PI_OVER_TWO) + NEGATIVE_THREE_DB;
}
else if (bearingAngleToSource <= PI && bearingAngleToSource > PI_OVER_TWO) {
// gainL(+pi,-1db)->(pi/2,-3db)
penumbraFilterGainL = TWO_OVER_PI *
(NEGATIVE_ONE_DB - NEGATIVE_THREE_DB) * (bearingAngleToSource - PI) + NEGATIVE_ONE_DB;
// gainR(+pi,-1db)->(pi/2,0db)
penumbraFilterGainR = TWO_OVER_PI *
(NEGATIVE_ONE_DB - ZERO_DB) * (bearingAngleToSource - PI) + NEGATIVE_ONE_DB;
}
else if (bearingAngleToSource <= PI_OVER_TWO && bearingAngleToSource > 0) {
// gainL(+pi/2,-3db)->(0,0db)
penumbraFilterGainL = TWO_OVER_PI *
(NEGATIVE_THREE_DB - ZERO_DB) * (bearingAngleToSource - PI_OVER_TWO) + NEGATIVE_THREE_DB;
// gainR(+p1/2,0db)->(0,0db)
penumbraFilterGainR = ZERO_DB;
}
else {
// gainL(0,0db)->(-pi/2,0db)
penumbraFilterGainL = ZERO_DB;
// gainR(0,0db)->(-pi/2,-3db)
penumbraFilterGainR = TWO_OVER_PI *
(ZERO_DB - NEGATIVE_THREE_DB) * (bearingAngleToSource) + ZERO_DB;
}
const float penumbraFilterGainL = (bearingRelativeAngleToSource <= -PI_OVER_TWO) ?
((+1.0 * ONE_OVER_TWO_PI * (bearingRelativeAngleToSource + PI_OVER_TWO)) + FULL_POWER) :
((+1.0 * ONE_OVER_TWO_PI * (bearingRelativeAngleToSource - PI)) + HALF_POWER);
const float penumbraFilterGainR = (bearingRelativeAngleToSource <= -PI_OVER_TWO) ?
((-1.0 * ONE_OVER_TWO_PI * (bearingRelativeAngleToSource + PI_OVER_TWO)) + HALF_POWER) :
((-1.0 * ONE_OVER_TWO_PI * (bearingRelativeAngleToSource - PI)) + HALF_POWER);
#if 0 #if 0
float distanceBetween = glm::length(relativePosition); qDebug() << "avatar="
qDebug() << "avatar=" << listeningNodeStream
<< listeningNodeStream
<< "gainL=" << "gainL="
<< penumbraFilterGainL << penumbraFilterGainL
<< "gainR=" << "gainR="
<< penumbraFilterGainR << penumbraFilterGainR
<< "angle=" << "angle="
<< bearingRelativeAngleToSource << bearingAngleToSource;
<< "dist="
<< distanceBetween;
#endif #endif
// set the gain on both filter channels
penumbraFilter.setParameters(0, 0, SAMPLE_RATE, penumbraFilterFrequency, penumbraFilterGainL, penumbraFilterSlope); // set the gain on both filter channels
penumbraFilter.setParameters(0, 1, SAMPLE_RATE, penumbraFilterFrequency, penumbraFilterGainR, penumbraFilterSlope); AudioFilterHSF1s& penumbraFilter = streamToAdd->getFilter();
penumbraFilter.setParameters(0, 0, SAMPLE_RATE, penumbraFilterFrequency, penumbraFilterGainL, penumbraFilterSlope);
penumbraFilter.setParameters(0, 1, SAMPLE_RATE, penumbraFilterFrequency, penumbraFilterGainR, penumbraFilterSlope);
penumbraFilter.render(_clientSamples, _clientSamples, NETWORK_BUFFER_LENGTH_SAMPLES_STEREO / 2); penumbraFilter.render(_clientSamples, _clientSamples, NETWORK_BUFFER_LENGTH_SAMPLES_STEREO / 2);
}
} }
return 1; return 1;