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Merge pull request #8259 from kencooke/improved-hrtf

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Fix the AudioMixer distance attenuation.
This commit is contained in:
Brad Hefta-Gaub 2016-07-15 22:36:51 -07:00 committed by GitHub
commit dc2741950a
3 changed files with 12 additions and 11 deletions
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15
assignment-client/src/audio/AudioMixer.cpp
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@ -62,7 +62,7 @@
#include "AudioMixer.h" #include "AudioMixer.h"
const float LOUDNESS_TO_DISTANCE_RATIO = 0.00001f; const float LOUDNESS_TO_DISTANCE_RATIO = 0.00001f;
const float DEFAULT_ATTENUATION_PER_DOUBLING_IN_DISTANCE = 0.18f; const float DEFAULT_ATTENUATION_PER_DOUBLING_IN_DISTANCE = 0.5f; // attenuation = -6dB * log2(distance)
const float DEFAULT_NOISE_MUTING_THRESHOLD = 0.003f; const float DEFAULT_NOISE_MUTING_THRESHOLD = 0.003f;
const QString AUDIO_MIXER_LOGGING_TARGET_NAME = "audio-mixer"; const QString AUDIO_MIXER_LOGGING_TARGET_NAME = "audio-mixer";
const QString AUDIO_ENV_GROUP_KEY = "audio_env"; const QString AUDIO_ENV_GROUP_KEY = "audio_env";
@ -141,13 +141,14 @@ float AudioMixer::gainForSource(const PositionalAudioStream& streamToAdd,
} }
if (distanceBetween >= ATTENUATION_BEGINS_AT_DISTANCE) { if (distanceBetween >= ATTENUATION_BEGINS_AT_DISTANCE) {
// calculate the distance coefficient using the distance to this node
float distanceCoefficient = 1.0f - (logf(distanceBetween / ATTENUATION_BEGINS_AT_DISTANCE) / logf(2.0f)
* attenuationPerDoublingInDistance);
if (distanceCoefficient < 0) { // translate the zone setting to gain per log2(distance)
distanceCoefficient = 0; float g = 1.0f - attenuationPerDoublingInDistance;
} g = (g < EPSILON) ? EPSILON : g;
g = (g > 1.0f) ? 1.0f : g;
// calculate the distance coefficient using the distance to this node
float distanceCoefficient = exp2f(log2f(g) * log2f(distanceBetween/ATTENUATION_BEGINS_AT_DISTANCE));
// multiply the current attenuation coefficient by the distance coefficient // multiply the current attenuation coefficient by the distance coefficient
gain *= distanceCoefficient; gain *= distanceCoefficient;

6
domain-server/resources/describe-settings.json
View file

@ -589,8 +589,8 @@
"name": "attenuation_per_doubling_in_distance", "name": "attenuation_per_doubling_in_distance",
"label": "Default Domain Attenuation", "label": "Default Domain Attenuation",
"help": "Factor between 0 and 1.0 (0: No attenuation, 1.0: extreme attenuation)", "help": "Factor between 0 and 1.0 (0: No attenuation, 1.0: extreme attenuation)",
"placeholder": "0.18", "placeholder": "0.5",
"default": "0.18", "default": "0.5",
"advanced": false "advanced": false
}, },
{ {
@ -686,7 +686,7 @@
"name": "coefficient", "name": "coefficient",
"label": "Attenuation coefficient", "label": "Attenuation coefficient",
"can_set": true, "can_set": true,
"placeholder": "0.18" "placeholder": "0.5"
} }
] ]
}, },

2
libraries/audio-client/src/AudioClient.cpp
View file

@ -1308,7 +1308,7 @@ float AudioClient::gainForSource(float distance, float volume) {
// attenuate based on distance // attenuate based on distance
if (distance >= ATTENUATION_BEGINS_AT_DISTANCE) { if (distance >= ATTENUATION_BEGINS_AT_DISTANCE) {
gain /= distance; // attenuation = -6dB * log2(distance) gain /= (distance/ATTENUATION_BEGINS_AT_DISTANCE); // attenuation = -6dB * log2(distance)
} }
return gain; return gain;