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Implemented global gain for all audio.

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Fixed bug with falloff reference distance in HRTF audio.
This commit is contained in:
Kearwood Gilbert
2013-02-20 22:48:01 -08:00
parent b4d0348be9
commit 3e0e223b66
2 changed files with 10 additions and 35 deletions
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44
KREngine/kraken/KRAudioManager.cpp
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@@ -45,7 +45,9 @@ KRAudioManager::KRAudioManager(KRContext &context) : KRContextObject(context)
{
m_audio_engine = KRAKEN_AUDIO_SIREN;
m_global_reverb_send_level = 0.25f;
m_global_gain = 0.20f;
m_global_reverb_send_level = 1.00f;
// OpenAL
m_alDevice = 0;
@@ -174,7 +176,7 @@ void KRAudioManager::renderReverbImpulseResponse(KRAudioSample *impulse_response
vDSP_fft_zip(m_fft_setup, &reverb_sample_data_complex, 1, fft_size_log2, kFFTDirection_Forward);
float scale = 1.0f / fft_size;
float scale = 0.5f / fft_size;
int impulse_response_channels = 2;
for(int channel=0; channel < impulse_response_channels; channel++) {
@@ -209,7 +211,7 @@ void KRAudioManager::renderReverb()
memset(reverb_accum, 0, sizeof(float) * KRENGINE_AUDIO_BLOCK_LENGTH);
for(std::set<KRAudioSource *>::iterator itr=m_activeAudioSources.begin(); itr != m_activeAudioSources.end(); itr++) {
KRAudioSource *source = *itr;
float reverb_send_level = m_global_reverb_send_level * source->getReverb();
float reverb_send_level = m_global_reverb_send_level * m_global_gain * source->getReverb();
if(reverb_send_level > 0.0f) {
KRAudioSample *sample = source->getAudioSample();
if(sample) {
@@ -895,17 +897,7 @@ void KRAudioManager::initSiren()
KRSetAUCanonical(desc, 2, false);
desc.mSampleRate = 44100.0f;
/*
desc.mSampleRate = 44100.0; // set sample rate
desc.mFormatID = kAudioFormatLinearPCM;
desc.mFormatFlags = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
desc.mBitsPerChannel = sizeof(AudioSampleType) * 8; // AudioSampleType == 16 bit signed ints
desc.mChannelsPerFrame = 2;
desc.mFramesPerPacket = 1;
desc.mBytesPerFrame = (desc.mBitsPerChannel / 8) * desc.mChannelsPerFrame;
desc.mBytesPerPacket = desc.mBytesPerFrame * desc.mFramesPerPacket;
*/
OSDEBUG(AudioUnitSetProperty(m_auMixer,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input,
@@ -936,24 +928,7 @@ void KRAudioManager::initSiren()
KRSetAUCanonical(desc, 2, false);
desc.mSampleRate = 44100.0f;
// int channel_count = 2;
// bool interleaved = true;
//
// desc.mFormatID = kAudioFormatLinearPCM;
//#if CA_PREFER_FIXED_POINT
// desc.mFormatFlags = kAudioFormatFlagsCanonical | (kAudioUnitSampleFractionBits << kLinearPCMFormatFlagsSampleFractionShift);
//#else
// desc.mFormatFlags = kAudioFormatFlagsCanonical;
//#endif
// desc.mChannelsPerFrame = channel_count;
// desc.mFramesPerPacket = 1;
// desc.mBitsPerChannel = 8 * sizeof(AudioUnitSampleType);
// if (interleaved) {
// desc.mBytesPerPacket = desc.mBytesPerFrame = channel_count * sizeof(AudioUnitSampleType);
// } else {
// desc.mBytesPerPacket = desc.mBytesPerFrame = sizeof(AudioUnitSampleType);
// desc.mFormatFlags |= kAudioFormatFlagIsNonInterleaved;
// }
// ----
@@ -1282,8 +1257,7 @@ void KRAudioManager::renderHRTF()
KRVector3 source_listener_space = KRMat4::Dot(inv_listener_mat, source->getWorldTranslation());
KRVector3 source_dir = KRVector3::Normalize(source_listener_space);
float distance = source_listener_space.magnitude();
float gain = source->getGain() / pow(distance / source->getRolloffFactor(), 2.0f);
// gain = 1.0f; // FINDME, HACK - Test code
float gain = source->getGain() * m_global_gain / pow(KRMAX(distance / source->getReferenceDistance(), 1.0f), source->getRolloffFactor());
float azimuth = atan2(source_dir.x, source_dir.z);
float elevation = atan( source_dir.y / sqrt(source_dir.x * source_dir.x + source_dir.z * source_dir.z));
@@ -1322,7 +1296,7 @@ void KRAudioManager::renderHRTF()
memset(hrtf_sample->imagp, 0, sizeof(float) * fft_size);
float scale = 1.0f / fft_size;
float scale = 0.5f / fft_size;
vDSP_fft_zip(m_fft_setup, hrtf_sample, 1, fft_size_log2, kFFTDirection_Forward);
vDSP_zvmul(hrtf_sample, 1, hrtf_accum, 1, hrtf_convolved, 1, fft_size, 1);
vDSP_fft_zip(m_fft_setup, hrtf_convolved, 1, fft_size_log2, kFFTDirection_Inverse);

1
KREngine/kraken/KRAudioManager.h
View File

@@ -93,6 +93,7 @@ public:
private:
float m_global_reverb_send_level;
float m_global_gain;
KRVector3 m_listener_position;
KRVector3 m_listener_forward;