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Merge branch 'master' into efx-experiment

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This commit is contained in:
Chris Robinson
2008-01-04 14:40:38 -08:00
parent 9ed574b399 b3badbf97d
commit 5e48be27b8
7 changed files with 451 additions and 27 deletions
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Alc/ALc.c
+14
View File
@@ -33,6 +33,7 @@
#include "alThunk.h"
#include "alSource.h"
#include "alExtension.h"
#include "bs2b.h"
///////////////////////////////////////////////////////
// DEBUG INFORMATION
@@ -342,6 +343,8 @@ ALCvoid ProcessContext(ALCcontext *pContext)
*/
static ALvoid InitContext(ALCcontext *pContext)
{
int level;
//Initialise listener
pContext->Listener.Gain = 1.0f;
pContext->Listener.MetersPerUnit = 1.0f;
@@ -375,6 +378,14 @@ static ALvoid InitContext(ALCcontext *pContext)
pContext->lNumMonoSources = pContext->Device->MaxNoOfSources - pContext->lNumStereoSources;
strcpy(pContext->ExtensionList, "AL_EXT_EXPONENT_DISTANCE AL_EXT_FLOAT32 AL_EXT_IMA4 AL_EXT_LINEAR_DISTANCE AL_EXT_MCFORMATS AL_EXT_OFFSET");
level = GetConfigValueInt(NULL, "cf_level", 0);
if(level > 0 && level <= 6)
{
pContext->bs2b = calloc(1, sizeof(*pContext->bs2b));
bs2b_set_srate(pContext->bs2b, pContext->Frequency);
bs2b_set_level(pContext->bs2b, level);
}
}
@@ -408,6 +419,9 @@ static ALCvoid ExitContext(ALCcontext *pContext)
//Invalidate context
pContext->LastError = AL_NO_ERROR;
pContext->InUse = AL_FALSE;
free(pContext->bs2b);
pContext->bs2b = NULL;
}
///////////////////////////////////////////////////////
Alc/ALu.c
+113 -27
View File
@@ -30,6 +30,7 @@
#include "alBuffer.h"
#include "alThunk.h"
#include "alListener.h"
#include "bs2b.h"
#if defined(HAVE_STDINT_H)
#include <stdint.h>
@@ -497,9 +498,6 @@ static ALvoid CalcSourceParams(ALCcontext *ALContext, ALsource *ALSource,
case 4:
/* TODO: Add center/lfe channel in spatial calculations? */
case 6:
/* TODO: Special paths for 6.1 and 7.1 output would be nice */
case 7:
case 8:
// Apply a scalar so each individual speaker has more weight
PanningLR = 0.5f + (0.5f*Position[0]*1.41421356f);
PanningLR = __min(1.0f, PanningLR);
@@ -507,18 +505,16 @@ static ALvoid CalcSourceParams(ALCcontext *ALContext, ALsource *ALSource,
PanningFB = 0.5f + (0.5f*Position[2]*1.41421356f);
PanningFB = __min(1.0f, PanningFB);
PanningFB = __max(0.0f, PanningFB);
drysend[FRONT_LEFT] = ConeVolume * ListenerGain * DryMix * aluSqrt((1.0f-PanningLR)*(1.0f-PanningFB)); //FL Direct
drysend[FRONT_RIGHT] = ConeVolume * ListenerGain * DryMix * aluSqrt(( PanningLR)*(1.0f-PanningFB)); //FR Direct
drysend[BACK_LEFT] = ConeVolume * ListenerGain * DryMix * aluSqrt((1.0f-PanningLR)*( PanningFB)); //BL Direct
drysend[BACK_RIGHT] = ConeVolume * ListenerGain * DryMix * aluSqrt(( PanningLR)*( PanningFB)); //BR Direct
drysend[SIDE_LEFT] = 0.0f;
drysend[SIDE_RIGHT] = 0.0f;
drysend[FRONT_LEFT] = ConeVolume * ListenerGain * DryMix * aluSqrt((1.0f-PanningLR)*(1.0f-PanningFB));
drysend[FRONT_RIGHT] = ConeVolume * ListenerGain * DryMix * aluSqrt(( PanningLR)*(1.0f-PanningFB));
drysend[BACK_LEFT] = ConeVolume * ListenerGain * DryMix * aluSqrt((1.0f-PanningLR)*( PanningFB));
drysend[BACK_RIGHT] = ConeVolume * ListenerGain * DryMix * aluSqrt(( PanningLR)*( PanningFB));
if(ALSource->Send[0].Slot.effectslot)
{
wetsend[FRONT_LEFT] = ListenerGain * WetMix * aluSqrt((1.0f-PanningLR)*(1.0f-PanningFB)); //FL Room
wetsend[FRONT_RIGHT] = ListenerGain * WetMix * aluSqrt(( PanningLR)*(1.0f-PanningFB)); //FR Room
wetsend[BACK_LEFT] = ListenerGain * WetMix * aluSqrt((1.0f-PanningLR)*( PanningFB)); //BL Room
wetsend[BACK_RIGHT] = ListenerGain * WetMix * aluSqrt(( PanningLR)*( PanningFB)); //BR Room
wetsend[FRONT_LEFT] = ListenerGain * WetMix * aluSqrt((1.0f-PanningLR)*(1.0f-PanningFB));
wetsend[FRONT_RIGHT] = ListenerGain * WetMix * aluSqrt(( PanningLR)*(1.0f-PanningFB));
wetsend[BACK_LEFT] = ListenerGain * WetMix * aluSqrt((1.0f-PanningLR)*( PanningFB));
wetsend[BACK_RIGHT] = ListenerGain * WetMix * aluSqrt(( PanningLR)*( PanningFB));
}
else
{
@@ -528,9 +524,71 @@ static ALvoid CalcSourceParams(ALCcontext *ALContext, ALsource *ALSource,
wetsend[BACK_RIGHT] = 0.0f;
*wetgainhf = 1.0f;
}
wetsend[SIDE_LEFT] = 0.0f;
wetsend[SIDE_RIGHT] = 0.0f;
break;
case 7:
case 8:
PanningFB = 1.0f - fabs(Position[2]*1.15470054f);
PanningFB = __min(1.0f, PanningFB);
PanningFB = __max(0.0f, PanningFB);
PanningLR = 0.5f + (0.5*Position[0]*((1.0f-PanningFB)*2.0f));
PanningLR = __min(1.0f, PanningLR);
PanningLR = __max(0.0f, PanningLR);
if(Position[2] > 0.0f)
{
drysend[BACK_LEFT] = ConeVolume * ListenerGain * DryMix * aluSqrt((1.0f-PanningLR)*(1.0f-PanningFB));
drysend[BACK_RIGHT] = ConeVolume * ListenerGain * DryMix * aluSqrt(( PanningLR)*(1.0f-PanningFB));
drysend[SIDE_LEFT] = ConeVolume * ListenerGain * DryMix * aluSqrt((1.0f-PanningLR)*( PanningFB));
drysend[SIDE_RIGHT] = ConeVolume * ListenerGain * DryMix * aluSqrt(( PanningLR)*( PanningFB));
drysend[FRONT_LEFT] = 0.0f;
drysend[FRONT_RIGHT] = 0.0f;
if(ALSource->Send[0].Slot.effectslot)
{
wetsend[BACK_LEFT] = ListenerGain * WetMix * aluSqrt((1.0f-PanningLR)*(1.0f-PanningFB));
wetsend[BACK_RIGHT] = ListenerGain * WetMix * aluSqrt(( PanningLR)*(1.0f-PanningFB));
wetsend[SIDE_LEFT] = ListenerGain * WetMix * aluSqrt((1.0f-PanningLR)*( PanningFB));
wetsend[SIDE_RIGHT] = ListenerGain * WetMix * aluSqrt(( PanningLR)*( PanningFB));
wetsend[FRONT_LEFT] = 0.0f;
wetsend[FRONT_RIGHT] = 0.0f;
}
else
{
wetsend[FRONT_LEFT] = 0.0f;
wetsend[FRONT_RIGHT] = 0.0f;
wetsend[SIDE_LEFT] = 0.0f;
wetsend[SIDE_RIGHT] = 0.0f;
wetsend[BACK_LEFT] = 0.0f;
wetsend[BACK_RIGHT] = 0.0f;
*wetgainhf = 1.0f;
}
}
else
{
drysend[FRONT_LEFT] = ConeVolume * ListenerGain * DryMix * aluSqrt((1.0f-PanningLR)*(1.0f-PanningFB));
drysend[FRONT_RIGHT] = ConeVolume * ListenerGain * DryMix * aluSqrt(( PanningLR)*(1.0f-PanningFB));
drysend[SIDE_LEFT] = ConeVolume * ListenerGain * DryMix * aluSqrt((1.0f-PanningLR)*( PanningFB));
drysend[SIDE_RIGHT] = ConeVolume * ListenerGain * DryMix * aluSqrt(( PanningLR)*( PanningFB));
drysend[BACK_LEFT] = 0.0f;
drysend[BACK_RIGHT] = 0.0f;
if(ALSource->Send[0].Slot.effectslot)
{
wetsend[FRONT_LEFT] = ListenerGain * WetMix * aluSqrt((1.0f-PanningLR)*(1.0f-PanningFB));
wetsend[FRONT_RIGHT] = ListenerGain * WetMix * aluSqrt(( PanningLR)*(1.0f-PanningFB));
wetsend[SIDE_LEFT] = ListenerGain * WetMix * aluSqrt((1.0f-PanningLR)*( PanningFB));
wetsend[SIDE_RIGHT] = ListenerGain * WetMix * aluSqrt(( PanningLR)*( PanningFB));
wetsend[BACK_LEFT] = 0.0f;
wetsend[BACK_RIGHT] = 0.0f;
}
else
{
wetsend[FRONT_LEFT] = 0.0f;
wetsend[FRONT_RIGHT] = 0.0f;
wetsend[SIDE_LEFT] = 0.0f;
wetsend[SIDE_RIGHT] = 0.0f;
wetsend[BACK_LEFT] = 0.0f;
wetsend[BACK_RIGHT] = 0.0f;
*wetgainhf = 1.0f;
}
}
default:
break;
}
@@ -714,20 +772,16 @@ ALvoid aluMixData(ALCcontext *ALContext,ALvoid *buffer,ALsizei size,ALenum forma
value = aluComputeDrySample(ALSource, DryGainHF, sample);
DryBuffer[j][FRONT_LEFT] += value*DrySend[FRONT_LEFT];
DryBuffer[j][FRONT_RIGHT] += value*DrySend[FRONT_RIGHT];
#if 0 /* FIXME: Re-enable when proper 6-channel spatialization is used */
DryBuffer[j][SIDE_LEFT] += value*DrySend[SIDE_LEFT];
DryBuffer[j][SIDE_RIGHT] += value*DrySend[SIDE_RIGHT];
#endif
DryBuffer[j][BACK_LEFT] += value*DrySend[BACK_LEFT];
DryBuffer[j][BACK_RIGHT] += value*DrySend[BACK_RIGHT];
//Room path final mix buffer and panning
value = aluComputeWetSample(ALSource, WetGainHF, sample);
WetBuffer[j][FRONT_LEFT] += value*WetSend[FRONT_LEFT];
WetBuffer[j][FRONT_RIGHT] += value*WetSend[FRONT_RIGHT];
#if 0 /* FIXME: Re-enable when proper 6-channel spatialization is used */
WetBuffer[j][SIDE_LEFT] += value*WetSend[SIDE_LEFT];
WetBuffer[j][SIDE_RIGHT] += value*WetSend[SIDE_RIGHT];
#endif
WetBuffer[j][BACK_LEFT] += value*WetSend[BACK_LEFT];
WetBuffer[j][BACK_RIGHT] += value*WetSend[BACK_RIGHT];
}
@@ -883,11 +937,27 @@ ALvoid aluMixData(ALCcontext *ALContext,ALvoid *buffer,ALsizei size,ALenum forma
}
break;
case AL_FORMAT_STEREO8:
for(i = 0;i < SamplesToDo;i++)
if(ALContext->bs2b)
{
((ALubyte*)buffer)[0] = (ALubyte)((aluF2S(DryBuffer[i][FRONT_LEFT] +WetBuffer[i][FRONT_LEFT])>>8)+128);
((ALubyte*)buffer)[1] = (ALubyte)((aluF2S(DryBuffer[i][FRONT_RIGHT]+WetBuffer[i][FRONT_RIGHT])>>8)+128);
buffer = ((ALubyte*)buffer) + 2;
for(i = 0;i < SamplesToDo;i++)
{
float samples[2];
samples[0] = DryBuffer[i][FRONT_LEFT] +WetBuffer[i][FRONT_LEFT];
samples[1] = DryBuffer[i][FRONT_RIGHT]+WetBuffer[i][FRONT_RIGHT];
bs2b_cross_feed(ALContext->bs2b, samples);
((ALubyte*)buffer)[0] = (ALubyte)((aluF2S(samples[0])>>8)+128);
((ALubyte*)buffer)[1] = (ALubyte)((aluF2S(samples[1])>>8)+128);
buffer = ((ALubyte*)buffer) + 2;
}
}
else
{
for(i = 0;i < SamplesToDo;i++)
{
((ALubyte*)buffer)[0] = (ALubyte)((aluF2S(DryBuffer[i][FRONT_LEFT] +WetBuffer[i][FRONT_LEFT])>>8)+128);
((ALubyte*)buffer)[1] = (ALubyte)((aluF2S(DryBuffer[i][FRONT_RIGHT]+WetBuffer[i][FRONT_RIGHT])>>8)+128);
buffer = ((ALubyte*)buffer) + 2;
}
}
break;
case AL_FORMAT_QUAD8:
@@ -949,11 +1019,27 @@ ALvoid aluMixData(ALCcontext *ALContext,ALvoid *buffer,ALsizei size,ALenum forma
}
break;
case AL_FORMAT_STEREO16:
for(i = 0;i < SamplesToDo;i++)
if(ALContext->bs2b)
{
((ALshort*)buffer)[0] = aluF2S(DryBuffer[i][FRONT_LEFT] +WetBuffer[i][FRONT_LEFT]);
((ALshort*)buffer)[1] = aluF2S(DryBuffer[i][FRONT_RIGHT]+WetBuffer[i][FRONT_RIGHT]);
buffer = ((ALshort*)buffer) + 2;
for(i = 0;i < SamplesToDo;i++)
{
float samples[2];
samples[0] = DryBuffer[i][FRONT_LEFT] +WetBuffer[i][FRONT_LEFT];
samples[1] = DryBuffer[i][FRONT_RIGHT]+WetBuffer[i][FRONT_RIGHT];
bs2b_cross_feed(ALContext->bs2b, samples);
((ALshort*)buffer)[0] = aluF2S(samples[0]);
((ALshort*)buffer)[1] = aluF2S(samples[1]);
buffer = ((ALshort*)buffer) + 2;
}
}
else
{
for(i = 0;i < SamplesToDo;i++)
{
((ALshort*)buffer)[0] = aluF2S(DryBuffer[i][FRONT_LEFT] +WetBuffer[i][FRONT_LEFT]);
((ALshort*)buffer)[1] = aluF2S(DryBuffer[i][FRONT_RIGHT]+WetBuffer[i][FRONT_RIGHT]);
buffer = ((ALshort*)buffer) + 2;
}
}
break;
case AL_FORMAT_QUAD16:
Alc/bs2b.c
+201
View File
@@ -0,0 +1,201 @@
/*-
* Copyright (c) 2005 Boris Mikhaylov
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <math.h>
#include "bs2b.h"
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
/* Single pole IIR filter.
* O[n] = a0*I[n] + a1*I[n-1] + b1*O[n-1]
*/
/* Lowpass filter */
#define lo_filter(in, out_1) (bs2b->a0_lo*(in) + bs2b->b1_lo*(out_1))
/* Highboost filter */
#define hi_filter(in, in_1, out_1) (bs2b->a0_hi*(in) + bs2b->a1_hi*(in_1) + bs2b->b1_hi*(out_1))
/* Set up all data. */
static void init(struct bs2b *bs2b)
{
double Fc_lo, Fc_hi;
double G_lo, G_hi;
double x;
if ((bs2b->srate > 192000) || (bs2b->srate < 2000))
bs2b->srate = BS2B_DEFAULT_SRATE;
switch(bs2b->level)
{
case BS2B_LOW_CLEVEL: /* Low crossfeed level */
Fc_lo = 360.0;
Fc_hi = 501.0;
G_lo = 0.398107170553497;
G_hi = 0.205671765275719;
break;
case BS2B_MIDDLE_CLEVEL: /* Middle crossfeed level */
Fc_lo = 500.0;
Fc_hi = 711.0;
G_lo = 0.459726988530872;
G_hi = 0.228208484414988;
break;
case BS2B_HIGH_CLEVEL: /* High crossfeed level (virtual speakers are closer to itself) */
Fc_lo = 700.0;
Fc_hi = 1021.0;
G_lo = 0.530884444230988;
G_hi = 0.250105790667544;
break;
case BS2B_LOW_ECLEVEL: /* Low easy crossfeed level */
Fc_lo = 360.0;
Fc_hi = 494.0;
G_lo = 0.316227766016838;
G_hi = 0.168236228897329;
break;
case BS2B_MIDDLE_ECLEVEL: /* Middle easy crossfeed level */
Fc_lo = 500.0;
Fc_hi = 689.0;
G_lo = 0.354813389233575;
G_hi = 0.187169483835901;
break;
default: /* High easy crossfeed level */
bs2b->level = BS2B_HIGH_ECLEVEL;
Fc_lo = 700.0;
Fc_hi = 975.0;
G_lo = 0.398107170553497;
G_hi = 0.205671765275719;
break;
} /* switch */
/* $fc = $Fc / $s;
* $d = 1 / 2 / pi / $fc;
* $x = exp(-1 / $d);
*/
x = exp(-2.0 * M_PI * Fc_lo / bs2b->srate);
bs2b->b1_lo = x;
bs2b->a0_lo = G_lo * (1.0 - x);
x = exp(-2.0 * M_PI * Fc_hi / bs2b->srate);
bs2b->b1_hi = x;
bs2b->a0_hi = 1.0 - G_hi * (1.0 - x);
bs2b->a1_hi = -x;
bs2b->gain = 1.0 / (1.0 - G_hi + G_lo);
bs2b_clear(bs2b);
} /* init */
/* Exported functions.
* See descriptions in "bs2b.h"
*/
void bs2b_set_level(struct bs2b *bs2b, int level)
{
if(level == bs2b->level)
return;
bs2b->level = level;
init(bs2b);
} /* bs2b_set_level */
int bs2b_get_level(struct bs2b *bs2b)
{
return bs2b->level;
} /* bs2b_get_level */
void bs2b_set_srate(struct bs2b *bs2b, int srate)
{
if (srate == bs2b->srate)
return;
bs2b->srate = srate;
init(bs2b);
} /* bs2b_set_srate */
int bs2b_get_srate(struct bs2b *bs2b)
{
return bs2b->srate;
} /* bs2b_get_srate */
void bs2b_clear(struct bs2b *bs2b)
{
int loopv = sizeof(bs2b->last_sample);
while (loopv)
{
((char *)&bs2b->last_sample)[--loopv] = 0;
}
} /* bs2b_clear */
int bs2b_is_clear(struct bs2b *bs2b)
{
int loopv = sizeof(bs2b->last_sample);
while (loopv)
{
if (((char *)&bs2b->last_sample)[--loopv] != 0)
return 0;
}
return 1;
} /* bs2b_is_clear */
void bs2b_cross_feed(struct bs2b *bs2b, float *sample)
{
/* Lowpass filter */
bs2b->last_sample.lo[0] = lo_filter(sample[0], bs2b->last_sample.lo[0]);
bs2b->last_sample.lo[1] = lo_filter(sample[1], bs2b->last_sample.lo[1]);
/* Highboost filter */
bs2b->last_sample.hi[0] = hi_filter(sample[0], bs2b->last_sample.asis[0], bs2b->last_sample.hi[0]);
bs2b->last_sample.hi[1] = hi_filter(sample[1], bs2b->last_sample.asis[1], bs2b->last_sample.hi[1]);
bs2b->last_sample.asis[0] = sample[0];
bs2b->last_sample.asis[1] = sample[1];
/* Crossfeed */
sample[0] = bs2b->last_sample.hi[0] + bs2b->last_sample.lo[1];
sample[1] = bs2b->last_sample.hi[1] + bs2b->last_sample.lo[0];
/* Bass boost cause allpass attenuation */
sample[0] *= bs2b->gain;
sample[1] *= bs2b->gain;
/* Clipping of overloaded samples */
#if 0
if (sample[0] > 1.0)
sample[0] = 1.0;
if (sample[0] < -1.0)
sample[0] = -1.0;
if (sample[1] > 1.0)
sample[1] = 1.0;
if (sample[1] < -1.0)
sample[1] = -1.0;
#endif
} /* bs2b_cross_feed */
CMakeLists.txt
+1
View File
@@ -182,6 +182,7 @@ SET(ALC_OBJS Alc/ALc.c
Alc/alcConfig.c
Alc/alcRing.c
Alc/alcThread.c
Alc/bs2b.c
)
SET(BACKENDS "")
OpenAL32/Include/alMain.h
+2
View File
@@ -181,6 +181,8 @@ struct ALCcontext_struct
ALCdevice *Device;
ALCchar ExtensionList[1024];
struct bs2b *bs2b;
ALCcontext *next;
};
OpenAL32/Include/bs2b.h
+109
View File
@@ -0,0 +1,109 @@
/*-
* Copyright (c) 2005 Boris Mikhaylov
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef BS2B_H
#define BS2B_H
/* Number of crossfeed levels */
#define BS2B_CLEVELS 3
/* Normal crossfeed levels */
#define BS2B_HIGH_CLEVEL 3
#define BS2B_MIDDLE_CLEVEL 2
#define BS2B_LOW_CLEVEL 1
/* Easy crossfeed levels */
#define BS2B_HIGH_ECLEVEL BS2B_HIGH_CLEVEL + BS2B_CLEVELS
#define BS2B_MIDDLE_ECLEVEL BS2B_MIDDLE_CLEVEL + BS2B_CLEVELS
#define BS2B_LOW_ECLEVEL BS2B_LOW_CLEVEL + BS2B_CLEVELS
/* Default crossfeed levels */
#define BS2B_DEFAULT_CLEVEL BS2B_HIGH_ECLEVEL
/* Default sample rate (Hz) */
#define BS2B_DEFAULT_SRATE 44100
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
struct bs2b {
int level; /* Crossfeed level */
int srate; /* Sample rate (Hz) */
/* Lowpass IIR filter coefficients */
double a0_lo;
double b1_lo;
/* Highboost IIR filter coefficients */
double a0_hi;
double a1_hi;
double b1_hi;
/* Global gain against overloading */
double gain;
/* Buffer of last filtered sample.
* [0] - first channel, [1] - second channel
*/
struct t_last_sample {
double asis[2];
double lo[2];
double hi[2];
} last_sample;
};
/* Clear buffers and set new coefficients with new crossfeed level value.
* level - crossfeed level of *LEVEL values.
*/
void bs2b_set_level(struct bs2b *bs2b, int level);
/* Return current crossfeed level value */
int bs2b_get_level(struct bs2b *bs2b);
/* Clear buffers and set new coefficients with new sample rate value.
* srate - sample rate by Hz.
*/
void bs2b_set_srate(struct bs2b *bs2b, int srate);
/* Return current sample rate value */
int bs2b_get_srate(struct bs2b *bs2b);
/* Clear buffer */
void bs2b_clear(struct bs2b *bs2b);
/* Return 1 if buffer is clear */
int bs2b_is_clear(struct bs2b *bs2b);
/* Crossfeeds one stereo sample that are pointed by sample.
* [0] - first channel, [1] - second channel.
* Returns crossfided samle by sample pointer.
*/
/* sample poits to floats */
void bs2b_cross_feed(struct bs2b *bs2b, float *sample);
#ifdef __cplusplus
} /* extern "C" */
#endif /* __cplusplus */
#endif /* BS2B_H */
openalrc.sample
+11
View File
@@ -23,6 +23,17 @@ format = AL_FORMAT_STEREO16 # Sets the output format. Can be one of:
# AL_FORMAT_71CHN16 (16-bit 7.1 output)
# Default is AL_FORMAT_STEREO16
cf_level = 0 # Sets the crossfeed level for stereo output. Valid values are:
# 0 - No crossfeed
# 1 - Low crossfeed
# 2 - Middle crossfeed
# 3 - High crossfeed (virtual speakers are closer to itself)
# 4 - Low easy crossfeed
# 5 - Middle easy crossfeed
# 6 - High easy crossfeed
# Default is 0. Users of headphones may want to try various
# settings. Has no effect on non-stereo modes.
frequency = 44100 # Sets the output frequency. Default is 44100
refresh = 0 # Sets the number of frames-per-update. Default is calculated as