445 lines
14 KiB
C
445 lines
14 KiB
C
/**
|
|
* 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., 59 Temple Place - Suite 330,
|
|
* Boston, MA 02111-1307, USA.
|
|
* Or go to http://www.gnu.org/copyleft/lgpl.html
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <math.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <ctype.h>
|
|
#include <assert.h>
|
|
|
|
#include "alMain.h"
|
|
#include "AL/al.h"
|
|
#include "AL/alc.h"
|
|
#include "alu.h"
|
|
|
|
static void SetSpeakerArrangement(const char *name, ALfloat SpeakerAngle[MaxChannels],
|
|
enum Channel Speaker2Chan[MaxChannels], ALint chans)
|
|
{
|
|
char *confkey, *next;
|
|
char *layout_str;
|
|
char *sep, *end;
|
|
enum Channel val;
|
|
const char *str;
|
|
int i;
|
|
|
|
if(!ConfigValueStr(NULL, name, &str) && !ConfigValueStr(NULL, "layout", &str))
|
|
return;
|
|
|
|
layout_str = strdup(str);
|
|
next = confkey = layout_str;
|
|
while(next && *next)
|
|
{
|
|
confkey = next;
|
|
next = strchr(confkey, ',');
|
|
if(next)
|
|
{
|
|
*next = 0;
|
|
do {
|
|
next++;
|
|
} while(isspace(*next) || *next == ',');
|
|
}
|
|
|
|
sep = strchr(confkey, '=');
|
|
if(!sep || confkey == sep)
|
|
{
|
|
ERR("Malformed speaker key: %s\n", confkey);
|
|
continue;
|
|
}
|
|
|
|
end = sep - 1;
|
|
while(isspace(*end) && end != confkey)
|
|
end--;
|
|
*(++end) = 0;
|
|
|
|
if(strcmp(confkey, "fl") == 0 || strcmp(confkey, "front-left") == 0)
|
|
val = FrontLeft;
|
|
else if(strcmp(confkey, "fr") == 0 || strcmp(confkey, "front-right") == 0)
|
|
val = FrontRight;
|
|
else if(strcmp(confkey, "fc") == 0 || strcmp(confkey, "front-center") == 0)
|
|
val = FrontCenter;
|
|
else if(strcmp(confkey, "bl") == 0 || strcmp(confkey, "back-left") == 0)
|
|
val = BackLeft;
|
|
else if(strcmp(confkey, "br") == 0 || strcmp(confkey, "back-right") == 0)
|
|
val = BackRight;
|
|
else if(strcmp(confkey, "bc") == 0 || strcmp(confkey, "back-center") == 0)
|
|
val = BackCenter;
|
|
else if(strcmp(confkey, "sl") == 0 || strcmp(confkey, "side-left") == 0)
|
|
val = SideLeft;
|
|
else if(strcmp(confkey, "sr") == 0 || strcmp(confkey, "side-right") == 0)
|
|
val = SideRight;
|
|
else
|
|
{
|
|
ERR("Unknown speaker for %s: \"%s\"\n", name, confkey);
|
|
continue;
|
|
}
|
|
|
|
*(sep++) = 0;
|
|
while(isspace(*sep))
|
|
sep++;
|
|
|
|
for(i = 0;i < chans;i++)
|
|
{
|
|
if(Speaker2Chan[i] == val)
|
|
{
|
|
long angle = strtol(sep, NULL, 10);
|
|
if(angle >= -180 && angle <= 180)
|
|
SpeakerAngle[i] = angle * F_PI/180.0f;
|
|
else
|
|
ERR("Invalid angle for speaker \"%s\": %ld\n", confkey, angle);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
free(layout_str);
|
|
layout_str = NULL;
|
|
|
|
for(i = 0;i < chans;i++)
|
|
{
|
|
int min = i;
|
|
int i2;
|
|
|
|
for(i2 = i+1;i2 < chans;i2++)
|
|
{
|
|
if(SpeakerAngle[i2] < SpeakerAngle[min])
|
|
min = i2;
|
|
}
|
|
|
|
if(min != i)
|
|
{
|
|
ALfloat tmpf;
|
|
enum Channel tmpc;
|
|
|
|
tmpf = SpeakerAngle[i];
|
|
SpeakerAngle[i] = SpeakerAngle[min];
|
|
SpeakerAngle[min] = tmpf;
|
|
|
|
tmpc = Speaker2Chan[i];
|
|
Speaker2Chan[i] = Speaker2Chan[min];
|
|
Speaker2Chan[min] = tmpc;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* ComputeAngleGains
|
|
*
|
|
* Sets channel gains based on a given source's angle and its half-width. The
|
|
* angle and hwidth parameters are in radians.
|
|
*/
|
|
ALvoid ComputeAngleGains(const ALCdevice *device, ALfloat angle, ALfloat hwidth, ALfloat ingain, ALfloat *gains)
|
|
{
|
|
ALfloat tmpgains[MaxChannels] = { 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f };
|
|
enum Channel Speaker2Chan[MaxChannels];
|
|
ALfloat SpeakerAngle[MaxChannels];
|
|
ALfloat langle, rangle;
|
|
ALfloat a;
|
|
ALuint i;
|
|
|
|
for(i = 0;i < device->NumChan;i++)
|
|
Speaker2Chan[i] = device->Speaker2Chan[i];
|
|
for(i = 0;i < device->NumChan;i++)
|
|
SpeakerAngle[i] = device->SpeakerAngle[i];
|
|
|
|
/* Some easy special-cases first... */
|
|
if(device->NumChan == 1 || hwidth >= F_PI)
|
|
{
|
|
/* Full coverage for all speakers. */
|
|
for(i = 0;i < device->NumChan;i++)
|
|
{
|
|
enum Channel chan = Speaker2Chan[i];
|
|
gains[chan] = ingain;
|
|
}
|
|
return;
|
|
}
|
|
if(hwidth <= 0.0f)
|
|
{
|
|
/* Infinitely small sound point. */
|
|
for(i = 0;i < device->NumChan-1;i++)
|
|
{
|
|
if(angle >= SpeakerAngle[i] && angle < SpeakerAngle[i+1])
|
|
{
|
|
/* Sound is between speakers i and i+1 */
|
|
a = (angle-SpeakerAngle[i]) /
|
|
(SpeakerAngle[i+1]-SpeakerAngle[i]);
|
|
gains[Speaker2Chan[i]] = sqrtf(1.0f-a) * ingain;
|
|
gains[Speaker2Chan[i+1]] = sqrtf( a) * ingain;
|
|
return;
|
|
}
|
|
}
|
|
/* Sound is between last and first speakers */
|
|
if(angle < SpeakerAngle[0])
|
|
angle += F_PI*2.0f;
|
|
a = (angle-SpeakerAngle[i]) /
|
|
(F_PI*2.0f + SpeakerAngle[0]-SpeakerAngle[i]);
|
|
gains[Speaker2Chan[i]] = sqrtf(1.0f-a) * ingain;
|
|
gains[Speaker2Chan[0]] = sqrtf( a) * ingain;
|
|
return;
|
|
}
|
|
|
|
if(fabsf(angle)+hwidth > F_PI)
|
|
{
|
|
/* The coverage area would go outside of -pi...+pi. Instead, rotate the
|
|
* speaker angles so it would be as if angle=0, and keep them wrapped
|
|
* within -pi...+pi. */
|
|
for(i = 0;i < device->NumChan;i++)
|
|
{
|
|
SpeakerAngle[i] -= angle;
|
|
if(SpeakerAngle[i] > F_PI)
|
|
SpeakerAngle[i] -= F_PI*2.0f;
|
|
else if(SpeakerAngle[i] < -F_PI)
|
|
SpeakerAngle[i] += F_PI*2.0f;
|
|
}
|
|
angle = 0.0f;
|
|
|
|
/* The speaker angles are expected to be in ascending order. There
|
|
* should be a better way to resort the lists... */
|
|
for(i = 0;i < device->NumChan-1;i++)
|
|
{
|
|
ALuint min = i;
|
|
ALuint j;
|
|
|
|
for(j = i+1;j < device->NumChan;j++)
|
|
{
|
|
if(SpeakerAngle[j] < SpeakerAngle[min])
|
|
min = j;
|
|
}
|
|
|
|
if(min != i)
|
|
{
|
|
ALfloat tmpf;
|
|
enum Channel tmpc;
|
|
|
|
tmpf = SpeakerAngle[i];
|
|
SpeakerAngle[i] = SpeakerAngle[min];
|
|
SpeakerAngle[min] = tmpf;
|
|
|
|
tmpc = Speaker2Chan[i];
|
|
Speaker2Chan[i] = Speaker2Chan[min];
|
|
Speaker2Chan[min] = tmpc;
|
|
}
|
|
}
|
|
}
|
|
langle = angle - hwidth;
|
|
rangle = angle + hwidth;
|
|
|
|
/* First speaker */
|
|
i = 0;
|
|
do {
|
|
ALuint last = device->NumChan-1;
|
|
enum Channel chan = Speaker2Chan[i];
|
|
|
|
if(SpeakerAngle[i] >= langle && SpeakerAngle[i] <= rangle)
|
|
{
|
|
tmpgains[chan] = 1.0f;
|
|
continue;
|
|
}
|
|
|
|
if(SpeakerAngle[i] < langle && SpeakerAngle[i+1] > langle)
|
|
{
|
|
a = (langle-SpeakerAngle[i]) /
|
|
(SpeakerAngle[i+1]-SpeakerAngle[i]);
|
|
tmpgains[chan] = lerp(tmpgains[chan], 1.0f, 1.0f-a);
|
|
}
|
|
if(SpeakerAngle[i] > rangle)
|
|
{
|
|
a = (F_PI*2.0f + rangle-SpeakerAngle[last]) /
|
|
(F_PI*2.0f + SpeakerAngle[i]-SpeakerAngle[last]);
|
|
tmpgains[chan] = lerp(tmpgains[chan], 1.0f, a);
|
|
}
|
|
else if(SpeakerAngle[last] < rangle)
|
|
{
|
|
a = (rangle-SpeakerAngle[last]) /
|
|
(F_PI*2.0f + SpeakerAngle[i]-SpeakerAngle[last]);
|
|
tmpgains[chan] = lerp(tmpgains[chan], 1.0f, a);
|
|
}
|
|
} while(0);
|
|
|
|
for(i = 1;i < device->NumChan-1;i++)
|
|
{
|
|
enum Channel chan = Speaker2Chan[i];
|
|
if(SpeakerAngle[i] >= langle && SpeakerAngle[i] <= rangle)
|
|
{
|
|
tmpgains[chan] = 1.0f;
|
|
continue;
|
|
}
|
|
|
|
if(SpeakerAngle[i] < langle && SpeakerAngle[i+1] > langle)
|
|
{
|
|
a = (langle-SpeakerAngle[i]) /
|
|
(SpeakerAngle[i+1]-SpeakerAngle[i]);
|
|
tmpgains[chan] = lerp(tmpgains[chan], 1.0f, 1.0f-a);
|
|
}
|
|
if(SpeakerAngle[i] > rangle && SpeakerAngle[i-1] < rangle)
|
|
{
|
|
a = (rangle-SpeakerAngle[i-1]) /
|
|
(SpeakerAngle[i]-SpeakerAngle[i-1]);
|
|
tmpgains[chan] = lerp(tmpgains[chan], 1.0f, a);
|
|
}
|
|
}
|
|
|
|
/* Last speaker */
|
|
i = device->NumChan-1;
|
|
do {
|
|
enum Channel chan = Speaker2Chan[i];
|
|
if(SpeakerAngle[i] >= langle && SpeakerAngle[i] <= rangle)
|
|
{
|
|
tmpgains[Speaker2Chan[i]] = 1.0f;
|
|
continue;
|
|
}
|
|
if(SpeakerAngle[i] > rangle && SpeakerAngle[i-1] < rangle)
|
|
{
|
|
a = (rangle-SpeakerAngle[i-1]) /
|
|
(SpeakerAngle[i]-SpeakerAngle[i-1]);
|
|
tmpgains[chan] = lerp(tmpgains[chan], 1.0f, a);
|
|
}
|
|
if(SpeakerAngle[i] < langle)
|
|
{
|
|
a = (langle-SpeakerAngle[i]) /
|
|
(F_PI*2.0f + SpeakerAngle[0]-SpeakerAngle[i]);
|
|
tmpgains[chan] = lerp(tmpgains[chan], 1.0f, 1.0f-a);
|
|
}
|
|
else if(SpeakerAngle[0] > langle)
|
|
{
|
|
a = (F_PI*2.0f + langle-SpeakerAngle[i]) /
|
|
(F_PI*2.0f + SpeakerAngle[0]-SpeakerAngle[i]);
|
|
tmpgains[chan] = lerp(tmpgains[chan], 1.0f, 1.0f-a);
|
|
}
|
|
} while(0);
|
|
|
|
for(i = 0;i < device->NumChan;i++)
|
|
{
|
|
enum Channel chan = device->Speaker2Chan[i];
|
|
gains[chan] = sqrtf(tmpgains[chan]) * ingain;
|
|
}
|
|
}
|
|
|
|
|
|
ALvoid aluInitPanning(ALCdevice *Device)
|
|
{
|
|
const char *layoutname = NULL;
|
|
enum Channel *Speaker2Chan;
|
|
ALfloat *SpeakerAngle;
|
|
|
|
Speaker2Chan = Device->Speaker2Chan;
|
|
SpeakerAngle = Device->SpeakerAngle;
|
|
switch(Device->FmtChans)
|
|
{
|
|
case DevFmtMono:
|
|
Device->NumChan = 1;
|
|
Speaker2Chan[0] = FrontCenter;
|
|
SpeakerAngle[0] = F_PI/180.0f * 0.0f;
|
|
layoutname = NULL;
|
|
break;
|
|
|
|
case DevFmtStereo:
|
|
Device->NumChan = 2;
|
|
Speaker2Chan[0] = FrontLeft;
|
|
Speaker2Chan[1] = FrontRight;
|
|
SpeakerAngle[0] = F_PI/180.0f * -90.0f;
|
|
SpeakerAngle[1] = F_PI/180.0f * 90.0f;
|
|
layoutname = "layout_stereo";
|
|
break;
|
|
|
|
case DevFmtQuad:
|
|
Device->NumChan = 4;
|
|
Speaker2Chan[0] = BackLeft;
|
|
Speaker2Chan[1] = FrontLeft;
|
|
Speaker2Chan[2] = FrontRight;
|
|
Speaker2Chan[3] = BackRight;
|
|
SpeakerAngle[0] = F_PI/180.0f * -135.0f;
|
|
SpeakerAngle[1] = F_PI/180.0f * -45.0f;
|
|
SpeakerAngle[2] = F_PI/180.0f * 45.0f;
|
|
SpeakerAngle[3] = F_PI/180.0f * 135.0f;
|
|
layoutname = "layout_quad";
|
|
break;
|
|
|
|
case DevFmtX51:
|
|
Device->NumChan = 5;
|
|
Speaker2Chan[0] = BackLeft;
|
|
Speaker2Chan[1] = FrontLeft;
|
|
Speaker2Chan[2] = FrontCenter;
|
|
Speaker2Chan[3] = FrontRight;
|
|
Speaker2Chan[4] = BackRight;
|
|
SpeakerAngle[0] = F_PI/180.0f * -110.0f;
|
|
SpeakerAngle[1] = F_PI/180.0f * -30.0f;
|
|
SpeakerAngle[2] = F_PI/180.0f * 0.0f;
|
|
SpeakerAngle[3] = F_PI/180.0f * 30.0f;
|
|
SpeakerAngle[4] = F_PI/180.0f * 110.0f;
|
|
layoutname = "layout_surround51";
|
|
break;
|
|
|
|
case DevFmtX51Side:
|
|
Device->NumChan = 5;
|
|
Speaker2Chan[0] = SideLeft;
|
|
Speaker2Chan[1] = FrontLeft;
|
|
Speaker2Chan[2] = FrontCenter;
|
|
Speaker2Chan[3] = FrontRight;
|
|
Speaker2Chan[4] = SideRight;
|
|
SpeakerAngle[0] = F_PI/180.0f * -90.0f;
|
|
SpeakerAngle[1] = F_PI/180.0f * -30.0f;
|
|
SpeakerAngle[2] = F_PI/180.0f * 0.0f;
|
|
SpeakerAngle[3] = F_PI/180.0f * 30.0f;
|
|
SpeakerAngle[4] = F_PI/180.0f * 90.0f;
|
|
layoutname = "layout_side51";
|
|
break;
|
|
|
|
case DevFmtX61:
|
|
Device->NumChan = 6;
|
|
Speaker2Chan[0] = SideLeft;
|
|
Speaker2Chan[1] = FrontLeft;
|
|
Speaker2Chan[2] = FrontCenter;
|
|
Speaker2Chan[3] = FrontRight;
|
|
Speaker2Chan[4] = SideRight;
|
|
Speaker2Chan[5] = BackCenter;
|
|
SpeakerAngle[0] = F_PI/180.0f * -90.0f;
|
|
SpeakerAngle[1] = F_PI/180.0f * -30.0f;
|
|
SpeakerAngle[2] = F_PI/180.0f * 0.0f;
|
|
SpeakerAngle[3] = F_PI/180.0f * 30.0f;
|
|
SpeakerAngle[4] = F_PI/180.0f * 90.0f;
|
|
SpeakerAngle[5] = F_PI/180.0f * 180.0f;
|
|
layoutname = "layout_surround61";
|
|
break;
|
|
|
|
case DevFmtX71:
|
|
Device->NumChan = 7;
|
|
Speaker2Chan[0] = BackLeft;
|
|
Speaker2Chan[1] = SideLeft;
|
|
Speaker2Chan[2] = FrontLeft;
|
|
Speaker2Chan[3] = FrontCenter;
|
|
Speaker2Chan[4] = FrontRight;
|
|
Speaker2Chan[5] = SideRight;
|
|
Speaker2Chan[6] = BackRight;
|
|
SpeakerAngle[0] = F_PI/180.0f * -150.0f;
|
|
SpeakerAngle[1] = F_PI/180.0f * -90.0f;
|
|
SpeakerAngle[2] = F_PI/180.0f * -30.0f;
|
|
SpeakerAngle[3] = F_PI/180.0f * 0.0f;
|
|
SpeakerAngle[4] = F_PI/180.0f * 30.0f;
|
|
SpeakerAngle[5] = F_PI/180.0f * 90.0f;
|
|
SpeakerAngle[6] = F_PI/180.0f * 150.0f;
|
|
layoutname = "layout_surround71";
|
|
break;
|
|
}
|
|
if(layoutname && Device->Type != Loopback)
|
|
SetSpeakerArrangement(layoutname, SpeakerAngle, Speaker2Chan, Device->NumChan);
|
|
}
|