/** * OpenAL cross platform audio library * Copyright (C) 1999-2010 by authors. * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * Or go to http://www.gnu.org/copyleft/lgpl.html */ #include "config.h" #include #include #include #include #include #include "alMain.h" #include "AL/al.h" #include "AL/alc.h" #include "alu.h" #include "bool.h" void ComputeAngleGains(const ALCdevice *device, ALfloat angle, ALfloat elevation, ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS]) { ALfloat dir[3] = { sinf(angle) * cosf(elevation), sinf(elevation), -cosf(angle) * cosf(elevation) }; ComputeDirectionalGains(device, dir, ingain, gains); } void ComputeDirectionalGains(const ALCdevice *device, const ALfloat dir[3], ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS]) { ALfloat coeffs[MAX_AMBI_COEFFS]; ALuint i, j; /* Convert from OpenAL coords to Ambisonics. */ ALfloat x = -dir[2]; ALfloat y = -dir[0]; ALfloat z = dir[1]; coeffs[0] = 0.7071f; /* sqrt(1.0 / 2.0) */ coeffs[1] = x; /* X */ coeffs[2] = y; /* Y */ coeffs[3] = z; /* Z */ coeffs[4] = 0.5f * (3.0f*z*z - 1.0f); /* 0.5 * (3*Z*Z - 1) */ coeffs[5] = 2.0f * z * x; /* 2*Z*X */ coeffs[6] = 2.0f * y * z; /* 2*Y*Z */ coeffs[7] = x*x - y*y; /* X*X - Y*Y */ coeffs[8] = 2.0f * x * y; /* 2*X*Y */ coeffs[9] = 0.5f * z * (5.0f*z*z - 3.0f); /* 0.5 * Z * (5*Z*Z - 3) */ coeffs[10] = 0.7262f * x * (5.0f*z*z - 1.0f); /* sqrt(135.0 / 256.0) * X * (5*Z*Z - 1) */ coeffs[11] = 0.7262f * y * (5.0f*z*z - 1.0f); /* sqrt(135.0 / 256.0) * Y * (5*Z*Z - 1) */ coeffs[12] = 2.5981f * z * (x*x - y*y); /* sqrt(27.0 / 4.0) * Z * (X*X - Y*Y) */ coeffs[13] = 5.1962f * x * y * z; /* sqrt(27) * X * Y * Z */ coeffs[14] = x * (x*x - 3.0f*y*y); /* X * (X*X - 3*Y*Y) */ coeffs[15] = y * (3.0f*x*x - y*y); /* Y * (3*X*X - Y*Y) */ for(i = 0;i < MAX_OUTPUT_CHANNELS;i++) gains[i] = 0.0f; for(i = 0;i < device->NumChannels;i++) { for(j = 0;j < MAX_AMBI_COEFFS;j++) gains[i] += device->Channel[i].HOACoeff[j]*coeffs[j]; gains[i] = maxf(gains[i], 0.0f) * ingain; } } void ComputeAmbientGains(const ALCdevice *device, ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS]) { ALuint i; for(i = 0;i < MAX_OUTPUT_CHANNELS;i++) gains[i] = 0.0f; for(i = 0;i < device->NumChannels;i++) { // The W coefficients are based on a mathematical average of the // output, scaled by sqrt(2) to compensate for FuMa-style Ambisonics // scaling the W channel input by sqrt(0.5). The square root of the // base average provides for a more perceptual average volume, better // suited to non-directional gains. gains[i] = sqrtf(device->Channel[i].HOACoeff[0]/1.4142f)*1.4142f * ingain; } } void ComputeBFormatGains(const ALCdevice *device, const ALfloat mtx[4], ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS]) { ALuint i, j; for(i = 0;i < MAX_OUTPUT_CHANNELS;i++) gains[i] = 0.0f; for(i = 0;i < device->NumChannels;i++) { for(j = 0;j < 4;j++) gains[i] += device->Channel[i].FOACoeff[j] * mtx[j]; gains[i] *= ingain; } } DECL_CONST static inline const char *GetLabelFromChannel(enum Channel channel) { switch(channel) { case FrontLeft: return "front-left"; case FrontRight: return "front-right"; case FrontCenter: return "front-center"; case LFE: return "lfe"; case BackLeft: return "back-left"; case BackRight: return "back-right"; case BackCenter: return "back-center"; case SideLeft: return "side-left"; case SideRight: return "side-right"; case InvalidChannel: break; } return "(unknown)"; } typedef struct ChannelMap { enum Channel ChanName; ChannelConfig Config; } ChannelMap; static void SetChannelMap(ALCdevice *device, const ChannelMap *chanmap, size_t count) { size_t i, j; for(i = 0;i < MAX_OUTPUT_CHANNELS && device->ChannelName[i] != InvalidChannel;i++) { if(device->ChannelName[i] == LFE) { for(j = 0;j < MAX_AMBI_COEFFS;j++) device->Channel[i].HOACoeff[j] = 0.0f; for(j = 0;j < 4;j++) device->Channel[i].FOACoeff[j] = 0.0f; continue; } for(j = 0;j < count;j++) { if(device->ChannelName[i] == chanmap[j].ChanName) { device->Channel[i] = chanmap[j].Config; break; } } if(j == count) ERR("Failed to match %s channel ("SZFMT") in config\n", GetLabelFromChannel(device->ChannelName[i]), i); } device->NumChannels = i; } static bool LoadChannelSetup(ALCdevice *device) { static const enum Channel mono_chans[1] = { FrontCenter }, stereo_chans[2] = { FrontLeft, FrontRight }, quad_chans[4] = { FrontLeft, FrontRight, BackLeft, BackRight }, surround51_chans[5] = { FrontLeft, FrontRight, FrontCenter, SideLeft, SideRight }, surround51rear_chans[5] = { FrontLeft, FrontRight, FrontCenter, BackLeft, BackRight }, surround61_chans[6] = { FrontLeft, FrontRight, FrontCenter, BackCenter, SideLeft, SideRight }, surround71_chans[7] = { FrontLeft, FrontRight, FrontCenter, BackLeft, BackRight, SideLeft, SideRight }; ChannelMap chanmap[MAX_OUTPUT_CHANNELS]; const enum Channel *channels = NULL; const char *layout = NULL; size_t count = 0; size_t i; switch(device->FmtChans) { case DevFmtMono: layout = "mono"; channels = mono_chans; count = COUNTOF(mono_chans); break; case DevFmtStereo: layout = "stereo"; channels = stereo_chans; count = COUNTOF(stereo_chans); break; case DevFmtQuad: layout = "quad"; channels = quad_chans; count = COUNTOF(quad_chans); break; case DevFmtX51: layout = "surround51"; channels = surround51_chans; count = COUNTOF(surround51_chans); break; case DevFmtX51Rear: layout = "surround51rear"; channels = surround51rear_chans; count = COUNTOF(surround51rear_chans); break; case DevFmtX61: layout = "surround61"; channels = surround61_chans; count = COUNTOF(surround61_chans); break; case DevFmtX71: layout = "surround71"; channels = surround71_chans; count = COUNTOF(surround71_chans); break; } if(!layout) return false; else { char name[32]; snprintf(name, sizeof(name), "%s/enable", layout); if(!GetConfigValueBool("layouts", name, 0)) return false; } for(i = 0;i < count;i++) { const char *channame; char chanlayout[32]; const char *value; int props; chanmap[i].ChanName = channels[i]; channame = GetLabelFromChannel(channels[i]); snprintf(chanlayout, sizeof(chanlayout), "%s/%s", layout, channame); if(!ConfigValueStr("layouts", chanlayout, &value)) { ERR("Missing channel %s\n", channame); return false; } props = sscanf(value, " %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f ; %f %f %f %f", &chanmap[i].Config.HOACoeff[0], &chanmap[i].Config.HOACoeff[1], &chanmap[i].Config.HOACoeff[2], &chanmap[i].Config.HOACoeff[3], &chanmap[i].Config.HOACoeff[4], &chanmap[i].Config.HOACoeff[5], &chanmap[i].Config.HOACoeff[6], &chanmap[i].Config.HOACoeff[7], &chanmap[i].Config.HOACoeff[8], &chanmap[i].Config.HOACoeff[9], &chanmap[i].Config.HOACoeff[10], &chanmap[i].Config.HOACoeff[11], &chanmap[i].Config.HOACoeff[12], &chanmap[i].Config.HOACoeff[13], &chanmap[i].Config.HOACoeff[14], &chanmap[i].Config.HOACoeff[15], &chanmap[i].Config.FOACoeff[0], &chanmap[i].Config.FOACoeff[1], &chanmap[i].Config.FOACoeff[2], &chanmap[i].Config.FOACoeff[3]); if(props == 0) { ERR("Failed to parse %s channel's properties\n", channame); return false; } if(props < 20) { ERR("Failed to parse %s channel's elements (expected 20, got %d)\n", channame, props); return false; } } SetChannelMap(device, chanmap, count); return true; } ALvoid aluInitPanning(ALCdevice *device) { static const ChannelMap MonoCfg[1] = { { FrontCenter, { { 1.4142f }, { 1.4142f } } }, }, StereoCfg[2] = { { FrontLeft, { { 0.7071f, 0.0f, 0.5f, 0.0f }, { 0.7071f, 0.0f, 0.5f, 0.0f } } }, { FrontRight, { { 0.7071f, 0.0f, -0.5f, 0.0f }, { 0.7071f, 0.0f, -0.5f, 0.0f } } }, }, QuadCfg[4] = { { FrontLeft, { { 0.353558f, 0.306181f, 0.306192f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, 0.117183f }, { 0.353553f, 0.250000f, 0.250000f, 0.0f } } }, { FrontRight, { { 0.353558f, 0.306181f, -0.306192f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, -0.117183f }, { 0.353553f, 0.250000f, -0.250000f, 0.0f } } }, { BackLeft, { { 0.353543f, -0.306192f, 0.306181f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, -0.117193f }, { 0.353553f, -0.250000f, 0.250000f, 0.0f } } }, { BackRight, { { 0.353543f, -0.306192f, -0.306181f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, 0.117193f }, { 0.353553f, -0.250000f, -0.250000f, 0.0f } } }, }, X51SideCfg[5] = { { FrontLeft, { { 0.208954f, 0.212846f, 0.238350f, 0.0f, 0.0f, 0.0f, 0.0f, -0.017738f, 0.204014f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.051023f, 0.047490f }, { 0.208954f, 0.162905f, 0.182425f, 0.0f } } }, { FrontRight, { { 0.208954f, 0.212846f, -0.238350f, 0.0f, 0.0f, 0.0f, 0.0f, -0.017738f, -0.204014f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.051023f, -0.047490f }, { 0.208954f, 0.162905f, -0.182425f, 0.0f } } }, { FrontCenter, { { 0.109403f, 0.179490f, 0.000000f, 0.0f, 0.0f, 0.0f, 0.0f, 0.142031f, -0.000002f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.072024f, -0.000001f }, { 0.109403f, 0.137375f, 0.000000f, 0.0f } } }, { SideLeft, { { 0.470936f, -0.369626f, 0.349386f, 0.0f, 0.0f, 0.0f, 0.0f, -0.031375f, -0.058144f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.007119f, -0.043968f }, { 0.470934f, -0.282903f, 0.267406f, 0.0f } } }, { SideRight, { { 0.470936f, -0.369626f, -0.349386f, 0.0f, 0.0f, 0.0f, 0.0f, -0.031375f, 0.058144f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.007119f, 0.043968f }, { 0.470934f, -0.282903f, -0.267406f, 0.0f } } }, }, X51RearCfg[5] = { { FrontLeft, { { 0.208954f, 0.212846f, 0.238350f, 0.0f, 0.0f, 0.0f, 0.0f, -0.017738f, 0.204014f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.051023f, 0.047490f }, { 0.208954f, 0.162905f, 0.182425f, 0.0f } } }, { FrontRight, { { 0.208954f, 0.212846f, -0.238350f, 0.0f, 0.0f, 0.0f, 0.0f, -0.017738f, -0.204014f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.051023f, -0.047490f }, { 0.208954f, 0.162905f, -0.182425f, 0.0f } } }, { FrontCenter, { { 0.109403f, 0.179490f, 0.000000f, 0.0f, 0.0f, 0.0f, 0.0f, 0.142031f, -0.000002f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.072024f, -0.000001f }, { 0.109403f, 0.137375f, 0.000000f, 0.0f } } }, { BackLeft, { { 0.470936f, -0.369626f, 0.349386f, 0.0f, 0.0f, 0.0f, 0.0f, -0.031375f, -0.058144f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.007119f, -0.043968f }, { 0.470934f, -0.282903f, 0.267406f, 0.0f } } }, { BackRight, { { 0.470936f, -0.369626f, -0.349386f, 0.0f, 0.0f, 0.0f, 0.0f, -0.031375f, 0.058144f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.007119f, 0.043968f }, { 0.470934f, -0.282903f, -0.267406f, 0.0f } } }, }, X61Cfg[6] = { { FrontLeft, { { 0.167065f, 0.200583f, 0.172695f, 0.0f, 0.0f, 0.0f, 0.0f, 0.029855f, 0.186407f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.039241f, 0.068910f }, { 0.167065f, 0.153519f, 0.132175f, 0.0f } } }, { FrontRight, { { 0.167065f, 0.200583f, -0.172695f, 0.0f, 0.0f, 0.0f, 0.0f, 0.029855f, -0.186407f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.039241f, -0.068910f }, { 0.167065f, 0.153519f, -0.132175f, 0.0f } } }, { FrontCenter, { { 0.109403f, 0.179490f, 0.000000f, 0.0f, 0.0f, 0.0f, 0.0f, 0.142031f, 0.000000f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.072024f, -0.000001f }, { 0.109403f, 0.137375f, 0.000000f, 0.0f } } }, { BackCenter, { { 0.353556f, -0.461940f, 0.000000f, 0.0f, 0.0f, 0.0f, 0.0f, 0.165723f, 0.000000f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, 0.000005f }, { 0.353556f, -0.353554f, 0.000000f, 0.0f } } }, { SideLeft, { { 0.289151f, -0.081301f, 0.401292f, 0.0f, 0.0f, 0.0f, 0.0f, -0.188208f, -0.071420f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.010099f, -0.032897f }, { 0.289151f, -0.062225f, 0.307136f, 0.0f } } }, { SideRight, { { 0.289151f, -0.081301f, -0.401292f, 0.0f, 0.0f, 0.0f, 0.0f, -0.188208f, 0.071420f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.010099f, 0.032897f }, { 0.289151f, -0.062225f, -0.307136f, 0.0f } } }, }, X71Cfg[7] = { { FrontLeft, { { 0.167065f, 0.200583f, 0.172695f, 0.0f, 0.0f, 0.0f, 0.0f, 0.029855f, 0.186407f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.039241f, 0.068910f }, { 0.167065f, 0.153519f, 0.132175f, 0.0f } } }, { FrontRight, { { 0.167065f, 0.200583f, -0.172695f, 0.0f, 0.0f, 0.0f, 0.0f, 0.029855f, -0.186407f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.039241f, -0.068910f }, { 0.167065f, 0.153519f, -0.132175f, 0.0f } } }, { FrontCenter, { { 0.109403f, 0.179490f, 0.000000f, 0.0f, 0.0f, 0.0f, 0.0f, 0.142031f, 0.000000f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.072024f, 0.000000f }, { 0.109403f, 0.137375f, 0.000000f, 0.0f } } }, { BackLeft, { { 0.224752f, -0.295009f, 0.170325f, 0.0f, 0.0f, 0.0f, 0.0f, 0.105349f, -0.182473f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, 0.065799f }, { 0.224752f, -0.225790f, 0.130361f, 0.0f } } }, { BackRight, { { 0.224752f, -0.295009f, -0.170325f, 0.0f, 0.0f, 0.0f, 0.0f, 0.105349f, 0.182473f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, -0.065799f }, { 0.224752f, -0.225790f, -0.130361f, 0.0f } } }, { SideLeft, { { 0.224739f, 0.000002f, 0.340644f, 0.0f, 0.0f, 0.0f, 0.0f, -0.210697f, 0.000002f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, -0.065795f }, { 0.224739f, 0.000000f, 0.260717f, 0.0f } } }, { SideRight, { { 0.224739f, 0.000002f, -0.340644f, 0.0f, 0.0f, 0.0f, 0.0f, -0.210697f, -0.000002f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, 0.065795f }, { 0.224739f, 0.000000f, -0.260717f, 0.0f } } }, }; const ChannelMap *chanmap = NULL; size_t count = 0; memset(device->Channel, 0, sizeof(device->Channel)); device->NumChannels = 0; if(LoadChannelSetup(device)) return; switch(device->FmtChans) { case DevFmtMono: count = COUNTOF(MonoCfg); chanmap = MonoCfg; break; case DevFmtStereo: count = COUNTOF(StereoCfg); chanmap = StereoCfg; break; case DevFmtQuad: count = COUNTOF(QuadCfg); chanmap = QuadCfg; break; case DevFmtX51: count = COUNTOF(X51SideCfg); chanmap = X51SideCfg; break; case DevFmtX51Rear: count = COUNTOF(X51RearCfg); chanmap = X51RearCfg; break; case DevFmtX61: count = COUNTOF(X61Cfg); chanmap = X61Cfg; break; case DevFmtX71: count = COUNTOF(X71Cfg); chanmap = X71Cfg; break; } SetChannelMap(device, chanmap, count); }