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handle addition of samples for an unattenuated listener

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This commit is contained in:
Stephen Birarda 2014-06-18 14:18:39 -07:00
parent db1031144b
commit 1228bd4a1e
1 changed files with 95 additions and 77 deletions
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34
assignment-client/src/audio/AudioMixer.cpp
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@ -93,6 +93,8 @@ void AudioMixer::addBufferToMixForListeningNodeWithBuffer(PositionalAudioRingBuf
int numSamplesDelay = 0;
float weakChannelAmplitudeRatio = 1.0f;
bool shouldAttenuate = false;
if (bufferToAdd != listeningNodeBuffer) {
// if the two buffer pointers do not match then these are different buffers
glm::vec3 relativePosition = bufferToAdd->getPosition() - listeningNodeBuffer->getPosition();
@ -111,6 +113,10 @@ void AudioMixer::addBufferToMixForListeningNodeWithBuffer(PositionalAudioRingBuf
++_sumMixes;
shouldAttenuate = !bufferToAdd->getListenerUnattenuatedZone()->contains(listeningNodeBuffer->getPosition());
if (shouldAttenuate) {
glm::quat inverseOrientation = glm::inverse(listeningNodeBuffer->getOrientation());
float distanceSquareToSource = glm::dot(relativePosition, relativePosition);
@ -183,10 +189,11 @@ void AudioMixer::addBufferToMixForListeningNodeWithBuffer(PositionalAudioRingBuf
weakChannelAmplitudeRatio = 1 - (PHASE_AMPLITUDE_RATIO_AT_90 * sinRatio);
}
}
}
const int16_t* nextOutputStart = bufferToAdd->getNextOutput();
if (!bufferToAdd->isStereo()) {
if (!bufferToAdd->isStereo() && shouldAttenuate) {
// this is a mono buffer, which means it gets full attenuation and spatialization
// if the bearing relative angle to source is > 0 then the delayed channel is the right one
@ -295,7 +302,8 @@ void AudioMixer::addBufferToMixForListeningNodeWithBuffer(PositionalAudioRingBuf
} else if (i + 1 < numSamplesDelay) {
// MMX add two delayed samples
__m64 bufferSamples = _mm_set_pi16(_clientSamples[parentIndex + delayedChannelOffset],
_clientSamples[parentIndex + SINGLE_STEREO_OFFSET + delayedChannelOffset], 0, 0);
_clientSamples[parentIndex + SINGLE_STEREO_OFFSET + delayedChannelOffset],
0, 0);
__m64 addSamples = _mm_set_pi16(delayNextOutputStart[i] * attenuationAndWeakChannelRatio,
delayNextOutputStart[i + 1] * attenuationAndWeakChannelRatio, 0, 0);
@ -317,16 +325,26 @@ void AudioMixer::addBufferToMixForListeningNodeWithBuffer(PositionalAudioRingBuf
}
}
} else {
// stereo buffer - do attenuation but no sample delay for spatialization
// this is a stereo buffer or an unattenuated buffer, don't perform spatialization
for (int s = 0; s < NETWORK_BUFFER_LENGTH_SAMPLES_STEREO; s += 4) {
// use MMX to clamp four additions at a time
_clientSamples[s] = glm::clamp(_clientSamples[s] + (int) (nextOutputStart[s] * attenuationCoefficient),
int stereoDivider = bufferToAdd->isStereo() ? 1 : 2;
if (!shouldAttenuate) {
attenuationCoefficient = 1.0f;
}
_clientSamples[s] = glm::clamp(_clientSamples[s]
+ (int) (nextOutputStart[s] * attenuationCoefficient),
MIN_SAMPLE_VALUE, MAX_SAMPLE_VALUE);
_clientSamples[s + 1] = glm::clamp(_clientSamples[s + 1] + (int) (nextOutputStart[s + 1] * attenuationCoefficient),
_clientSamples[s + 1] = glm::clamp(_clientSamples[s + 1]
+ (int) (nextOutputStart[s + (1 / stereoDivider)] * attenuationCoefficient),
MIN_SAMPLE_VALUE, MAX_SAMPLE_VALUE);
_clientSamples[s + 2] = glm::clamp(_clientSamples[s + 2] + (int) (nextOutputStart[s + 2] * attenuationCoefficient),
_clientSamples[s + 2] = glm::clamp(_clientSamples[s + 2]
+ (int) (nextOutputStart[s + (2 / stereoDivider)] * attenuationCoefficient),
MIN_SAMPLE_VALUE, MAX_SAMPLE_VALUE);
_clientSamples[s + 3] = glm::clamp(_clientSamples[s + 3] + (int) (nextOutputStart[s + 3] * attenuationCoefficient),
_clientSamples[s + 3] = glm::clamp(_clientSamples[s + 3]
+ (int) (nextOutputStart[s + (3 / stereoDivider)] * attenuationCoefficient),
MIN_SAMPLE_VALUE, MAX_SAMPLE_VALUE);
}
}