485 lines
18 KiB
C
485 lines
18 KiB
C
/**
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* OpenAL cross platform audio library
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* Copyright (C) 1999-2010 by authors.
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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* Or go to http://www.gnu.org/copyleft/lgpl.html
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*/
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#include "config.h"
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#include <math.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <assert.h>
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#include "alMain.h"
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#include "AL/al.h"
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#include "AL/alc.h"
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#include "alu.h"
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#include "bool.h"
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#define ZERO_ORDER_SCALE 0.0f
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#define FIRST_ORDER_SCALE 1.0f
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#define SECOND_ORDER_SCALE (1.0f / 1.22474f)
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#define THIRD_ORDER_SCALE (1.0f / 1.30657f)
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void ComputeAmbientGains(const ALCdevice *device, ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS])
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{
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ALuint i;
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for(i = 0;i < MAX_OUTPUT_CHANNELS;i++)
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gains[i] = 0.0f;
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for(i = 0;i < device->NumChannels;i++)
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{
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// The W coefficients are based on a mathematical average of the
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// output, scaled by sqrt(2) to compensate for FuMa-style Ambisonics
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// scaling the W channel input by sqrt(0.5). The square root of the
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// base average provides for a more perceptual average volume, better
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// suited to non-directional gains.
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gains[i] = sqrtf(device->AmbiCoeffs[i][0]/1.4142f) * ingain;
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}
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}
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void ComputeAngleGains(const ALCdevice *device, ALfloat angle, ALfloat elevation, ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS])
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{
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ALfloat dir[3] = {
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sinf(angle) * cosf(elevation),
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sinf(elevation),
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-cosf(angle) * cosf(elevation)
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};
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ComputeDirectionalGains(device, dir, ingain, gains);
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}
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void ComputeDirectionalGains(const ALCdevice *device, const ALfloat dir[3], ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS])
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{
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ALfloat coeffs[MAX_AMBI_COEFFS];
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ALuint i, j;
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/* Convert from OpenAL coords to Ambisonics. */
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ALfloat x = -dir[2];
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ALfloat y = -dir[0];
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ALfloat z = dir[1];
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coeffs[0] = 0.7071f; /* sqrt(1.0 / 2.0) */
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coeffs[1] = x; /* X */
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coeffs[2] = y; /* Y */
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coeffs[3] = z; /* Z */
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coeffs[4] = 0.5f * (3.0f*z*z - 1.0f); /* 0.5 * (3*Z*Z - 1) */
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coeffs[5] = 2.0f * z * x; /* 2*Z*X */
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coeffs[6] = 2.0f * y * z; /* 2*Y*Z */
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coeffs[7] = x*x - y*y; /* X*X - Y*Y */
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coeffs[8] = 2.0f * x * y; /* 2*X*Y */
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coeffs[9] = 0.5f * z * (5.0f*z*z - 3.0f); /* 0.5 * Z * (5*Z*Z - 3) */
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coeffs[10] = 0.7262f * x * (5.0f*z*z - 1.0f); /* sqrt(135.0 / 256.0) * X * (5*Z*Z - 1) */
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coeffs[11] = 0.7262f * y * (5.0f*z*z - 1.0f); /* sqrt(135.0 / 256.0) * Y * (5*Z*Z - 1) */
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coeffs[12] = 2.5981f * z * (x*x - y*y); /* sqrt(27.0 / 4.0) * Z * (X*X - Y*Y) */
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coeffs[13] = 5.1962f * x * y * z; /* sqrt(27) * X * Y * Z */
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coeffs[14] = x * (x*x - 3.0f*y*y); /* X * (X*X - 3*Y*Y) */
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coeffs[15] = y * (3.0f*x*x - y*y); /* Y * (3*X*X - Y*Y) */
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for(i = 0;i < MAX_OUTPUT_CHANNELS;i++)
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gains[i] = 0.0f;
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for(i = 0;i < device->NumChannels;i++)
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{
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float gain = 0.0f;
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for(j = 0;j < MAX_AMBI_COEFFS;j++)
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gain += device->AmbiCoeffs[i][j]*coeffs[j];
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gains[i] = gain * ingain;
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}
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}
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void ComputeBFormatGains(const ALCdevice *device, const ALfloat mtx[4], ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS])
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{
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ALuint i, j;
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for(i = 0;i < MAX_OUTPUT_CHANNELS;i++)
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gains[i] = 0.0f;
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for(i = 0;i < device->NumChannels;i++)
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{
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float scale = device->AmbiScale;
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gains[i] += device->AmbiCoeffs[i][0] * mtx[0];
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for(j = 1;j < 4;j++)
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gains[i] += device->AmbiCoeffs[i][j] * scale * mtx[j];
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gains[i] *= ingain;
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}
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}
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DECL_CONST static inline const char *GetLabelFromChannel(enum Channel channel)
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{
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switch(channel)
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{
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case FrontLeft: return "front-left";
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case FrontRight: return "front-right";
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case FrontCenter: return "front-center";
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case LFE: return "lfe";
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case BackLeft: return "back-left";
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case BackRight: return "back-right";
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case BackCenter: return "back-center";
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case SideLeft: return "side-left";
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case SideRight: return "side-right";
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case TopFrontLeft: return "top-front-left";
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case TopFrontRight: return "top-front-right";
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case TopBackLeft: return "top-back-left";
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case TopBackRight: return "top-back-right";
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case BottomFrontLeft: return "bottom-front-left";
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case BottomFrontRight: return "bottom-front-right";
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case BottomBackLeft: return "bottom-back-left";
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case BottomBackRight: return "bottom-back-right";
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case Aux0: return "aux-0";
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case Aux1: return "aux-1";
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case Aux2: return "aux-2";
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case Aux3: return "aux-3";
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case InvalidChannel: break;
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}
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return "(unknown)";
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}
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typedef struct ChannelMap {
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enum Channel ChanName;
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ChannelConfig Config;
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} ChannelMap;
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static void SetChannelMap(ALCdevice *device, const ChannelMap *chanmap, size_t count, ALfloat ambiscale)
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{
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size_t i, j, k;
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device->AmbiScale = ambiscale;
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for(i = 0;i < MAX_OUTPUT_CHANNELS && device->ChannelName[i] != InvalidChannel;i++)
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{
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if(device->ChannelName[i] == LFE)
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{
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for(j = 0;j < MAX_AMBI_COEFFS;j++)
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device->AmbiCoeffs[i][j] = 0.0f;
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continue;
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}
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for(j = 0;j < count;j++)
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{
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if(device->ChannelName[i] == chanmap[j].ChanName)
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{
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for(k = 0;k < MAX_AMBI_COEFFS;++k)
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device->AmbiCoeffs[i][k] = chanmap[j].Config[k];
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break;
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}
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}
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if(j == count)
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ERR("Failed to match %s channel ("SZFMT") in config\n", GetLabelFromChannel(device->ChannelName[i]), i);
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}
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device->NumChannels = i;
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}
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static bool LoadChannelSetup(ALCdevice *device)
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{
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static const enum Channel mono_chans[1] = {
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FrontCenter
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}, stereo_chans[2] = {
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FrontLeft, FrontRight
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}, quad_chans[4] = {
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FrontLeft, FrontRight,
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BackLeft, BackRight
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}, surround51_chans[5] = {
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FrontLeft, FrontRight, FrontCenter,
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SideLeft, SideRight
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}, surround51rear_chans[5] = {
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FrontLeft, FrontRight, FrontCenter,
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BackLeft, BackRight
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}, surround61_chans[6] = {
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FrontLeft, FrontRight,
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FrontCenter, BackCenter,
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SideLeft, SideRight
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}, surround71_chans[7] = {
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FrontLeft, FrontRight, FrontCenter,
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BackLeft, BackRight,
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SideLeft, SideRight
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};
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ChannelMap chanmap[MAX_OUTPUT_CHANNELS];
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const enum Channel *channels = NULL;
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const char *layout = NULL;
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ALfloat ambiscale = 1.0f;
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size_t count = 0;
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int order;
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size_t i;
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switch(device->FmtChans)
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{
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case DevFmtMono:
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layout = "mono";
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channels = mono_chans;
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count = COUNTOF(mono_chans);
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break;
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case DevFmtStereo:
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layout = "stereo";
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channels = stereo_chans;
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count = COUNTOF(stereo_chans);
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break;
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case DevFmtQuad:
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layout = "quad";
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channels = quad_chans;
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count = COUNTOF(quad_chans);
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break;
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case DevFmtX51:
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layout = "surround51";
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channels = surround51_chans;
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count = COUNTOF(surround51_chans);
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break;
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case DevFmtX51Rear:
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layout = "surround51rear";
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channels = surround51rear_chans;
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count = COUNTOF(surround51rear_chans);
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break;
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case DevFmtX61:
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layout = "surround61";
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channels = surround61_chans;
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count = COUNTOF(surround61_chans);
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break;
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case DevFmtX71:
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layout = "surround71";
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channels = surround71_chans;
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count = COUNTOF(surround71_chans);
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break;
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case DevFmtBFormat3D:
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break;
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}
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if(!layout)
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return false;
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else
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{
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char name[32];
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snprintf(name, sizeof(name), "%s/order", layout);
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if(!ConfigValueInt("layouts", name, &order))
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return false;
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if(order == 3)
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ambiscale = THIRD_ORDER_SCALE;
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else if(order == 2)
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ambiscale = SECOND_ORDER_SCALE;
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else if(order == 1)
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ambiscale = FIRST_ORDER_SCALE;
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else if(order == 0)
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ambiscale = ZERO_ORDER_SCALE;
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else
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{
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ERR("Unhandled order value %d (expected 0, 1, 2, or 3) for layout %s\n", order, name);
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return false;
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}
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}
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for(i = 0;i < count;i++)
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{
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const char *channame;
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char chanlayout[32];
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const char *value;
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int props = 0;
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char eol = 0;
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int j;
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chanmap[i].ChanName = channels[i];
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channame = GetLabelFromChannel(channels[i]);
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snprintf(chanlayout, sizeof(chanlayout), "%s/%s", layout, channame);
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if(!ConfigValueStr("layouts", chanlayout, &value))
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{
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ERR("Missing channel %s\n", channame);
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return false;
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}
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if(order == 3)
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props = sscanf(value, " %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %c",
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&chanmap[i].Config[0], &chanmap[i].Config[1], &chanmap[i].Config[2], &chanmap[i].Config[3],
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&chanmap[i].Config[4], &chanmap[i].Config[5], &chanmap[i].Config[6], &chanmap[i].Config[7],
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&chanmap[i].Config[8], &chanmap[i].Config[9], &chanmap[i].Config[10], &chanmap[i].Config[11],
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&chanmap[i].Config[12], &chanmap[i].Config[13], &chanmap[i].Config[14], &chanmap[i].Config[15],
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&eol
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);
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else if(order == 2)
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props = sscanf(value, " %f %f %f %f %f %f %f %f %f %c",
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&chanmap[i].Config[0], &chanmap[i].Config[1], &chanmap[i].Config[2],
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&chanmap[i].Config[3], &chanmap[i].Config[4], &chanmap[i].Config[5],
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&chanmap[i].Config[6], &chanmap[i].Config[7], &chanmap[i].Config[8],
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&eol
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);
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else if(order == 1)
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props = sscanf(value, " %f %f %f %f %c",
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&chanmap[i].Config[0], &chanmap[i].Config[1],
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&chanmap[i].Config[2], &chanmap[i].Config[3],
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&eol
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);
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else if(order == 0)
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props = sscanf(value, " %f %c", &chanmap[i].Config[0], &eol);
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if(props == 0)
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{
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ERR("Failed to parse option %s properties\n", chanlayout);
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return false;
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}
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if(props > (order+1)*(order+1))
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{
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ERR("Excess elements in option %s (expected %d)\n", chanlayout, (order+1)*(order+1));
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return false;
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}
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for(j = props;j < 16;++j)
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chanmap[i].Config[j] = 0.0f;
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}
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SetChannelMap(device, chanmap, count, ambiscale);
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return true;
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}
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ALvoid aluInitPanning(ALCdevice *device)
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{
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static const ChannelMap MonoCfg[1] = {
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{ FrontCenter, { 1.4142f } },
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}, StereoCfg[2] = {
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{ FrontLeft, { 0.7071f, 0.0f, 0.5f, 0.0f } },
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{ FrontRight, { 0.7071f, 0.0f, -0.5f, 0.0f } },
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}, QuadCfg[4] = {
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{ FrontLeft, { 0.353553f, 0.306184f, 0.306184f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, 0.117186f } },
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{ FrontRight, { 0.353553f, 0.306184f, -0.306184f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, -0.117186f } },
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{ BackLeft, { 0.353553f, -0.306184f, 0.306184f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, -0.117186f } },
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{ BackRight, { 0.353553f, -0.306184f, -0.306184f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, 0.117186f } },
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}, X51SideCfg[5] = {
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{ 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 } },
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{ 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 } },
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{ 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 } },
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{ 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 } },
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{ 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 } },
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}, X51RearCfg[5] = {
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{ 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 } },
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{ 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 } },
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{ 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 } },
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{ 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 } },
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{ 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 } },
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}, X61Cfg[6] = {
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{ 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 } },
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{ 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 } },
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{ 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 } },
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{ 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, 0.000000f } },
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{ 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 } },
|
|
{ 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 } },
|
|
}, 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 } },
|
|
{ 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 } },
|
|
{ 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 } },
|
|
{ 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 } },
|
|
{ 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 } },
|
|
{ SideLeft, { 0.224739f, 0.000000f, 0.340644f, 0.0f, 0.0f, 0.0f, 0.0f, -0.210697f, 0.000000f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, -0.065795f } },
|
|
{ SideRight, { 0.224739f, 0.000000f, -0.340644f, 0.0f, 0.0f, 0.0f, 0.0f, -0.210697f, 0.000000f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.000000f, 0.065795f } },
|
|
}, BFormat3D[4] = {
|
|
{ Aux0, { 1.0f, 0.0f, 0.0f, 0.0f } },
|
|
{ Aux1, { 0.0f, 1.0f, 0.0f, 0.0f } },
|
|
{ Aux2, { 0.0f, 0.0f, 1.0f, 0.0f } },
|
|
{ Aux3, { 0.0f, 0.0f, 0.0f, 1.0f } },
|
|
};
|
|
const ChannelMap *chanmap = NULL;
|
|
ALfloat ambiscale = 1.0f;
|
|
size_t count = 0;
|
|
|
|
device->AmbiScale = 1.0f;
|
|
memset(device->AmbiCoeffs, 0, sizeof(device->AmbiCoeffs));
|
|
device->NumChannels = 0;
|
|
|
|
if(device->Hrtf)
|
|
{
|
|
ALuint i;
|
|
|
|
count = COUNTOF(BFormat3D);
|
|
chanmap = BFormat3D;
|
|
ambiscale = 1.0f;
|
|
|
|
for(i = 0;i < count;i++)
|
|
device->ChannelName[i] = chanmap[i].ChanName;
|
|
for(;i < MAX_OUTPUT_CHANNELS;i++)
|
|
device->ChannelName[i] = InvalidChannel;
|
|
SetChannelMap(device, chanmap, count, ambiscale);
|
|
|
|
{
|
|
ALfloat (*coeffs_list[4])[2] = {
|
|
device->Hrtf_Params[0].Coeffs, device->Hrtf_Params[1].Coeffs,
|
|
device->Hrtf_Params[2].Coeffs, device->Hrtf_Params[3].Coeffs
|
|
};
|
|
ALuint *delay_list[4] = {
|
|
device->Hrtf_Params[0].Delay, device->Hrtf_Params[1].Delay,
|
|
device->Hrtf_Params[2].Delay, device->Hrtf_Params[3].Delay
|
|
};
|
|
GetBFormatHrtfCoeffs(device->Hrtf, 4, coeffs_list, delay_list);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
if(LoadChannelSetup(device))
|
|
return;
|
|
|
|
switch(device->FmtChans)
|
|
{
|
|
case DevFmtMono:
|
|
count = COUNTOF(MonoCfg);
|
|
chanmap = MonoCfg;
|
|
ambiscale = ZERO_ORDER_SCALE;
|
|
break;
|
|
|
|
case DevFmtStereo:
|
|
count = COUNTOF(StereoCfg);
|
|
chanmap = StereoCfg;
|
|
ambiscale = FIRST_ORDER_SCALE;
|
|
break;
|
|
|
|
case DevFmtQuad:
|
|
count = COUNTOF(QuadCfg);
|
|
chanmap = QuadCfg;
|
|
ambiscale = SECOND_ORDER_SCALE;
|
|
break;
|
|
|
|
case DevFmtX51:
|
|
count = COUNTOF(X51SideCfg);
|
|
chanmap = X51SideCfg;
|
|
ambiscale = THIRD_ORDER_SCALE;
|
|
break;
|
|
|
|
case DevFmtX51Rear:
|
|
count = COUNTOF(X51RearCfg);
|
|
chanmap = X51RearCfg;
|
|
ambiscale = THIRD_ORDER_SCALE;
|
|
break;
|
|
|
|
case DevFmtX61:
|
|
count = COUNTOF(X61Cfg);
|
|
chanmap = X61Cfg;
|
|
ambiscale = THIRD_ORDER_SCALE;
|
|
break;
|
|
|
|
case DevFmtX71:
|
|
count = COUNTOF(X71Cfg);
|
|
chanmap = X71Cfg;
|
|
ambiscale = THIRD_ORDER_SCALE;
|
|
break;
|
|
|
|
case DevFmtBFormat3D:
|
|
count = COUNTOF(BFormat3D);
|
|
chanmap = BFormat3D;
|
|
ambiscale = 1.0f;
|
|
break;
|
|
}
|
|
|
|
SetChannelMap(device, chanmap, count, ambiscale);
|
|
}
|