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Replace the cubic resampler with a 4-point sinc/lanczos filter

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This commit is contained in:
Chris Robinson 2015-09-27 23:52:16 -07:00
parent 3e60b18989
commit ab6622a8d6
11 changed files with 52 additions and 39 deletions
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10
Alc/ALc.c
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@ -1009,14 +1009,18 @@ static void alc_initconfig(void)
DefaultResampler = PointResampler;
else if(strcasecmp(str, "linear") == 0)
DefaultResampler = LinearResampler;
else if(strcasecmp(str, "sinc4") == 0)
DefaultResampler = FIR4Resampler;
else if(strcasecmp(str, "cubic") == 0)
DefaultResampler = CubicResampler;
{
ERR("Resampler option \"cubic\" is deprecated, using sinc4\n");
DefaultResampler = FIR4Resampler;
}
else
{
char *end;
n = strtol(str, &end, 0);
if(*end == '\0' && (n == PointResampler || n == LinearResampler || n == CubicResampler))
if(*end == '\0' && (n == PointResampler || n == LinearResampler || n == FIR4Resampler))
DefaultResampler = n;
else
WARN("Invalid resampler: %s\n", str);

29
Alc/mixer.c
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@ -43,7 +43,7 @@ static_assert((INT_MAX>>FRACTIONBITS)/MAX_PITCH > BUFFERSIZE,
extern inline void InitiatePositionArrays(ALuint frac, ALuint increment, ALuint *frac_arr, ALuint *pos_arr, ALuint size);
alignas(16) ALfloat CubicLUT[FRACTIONONE][4];
alignas(16) ALfloat ResampleCoeffs[FRACTIONONE][4];
static HrtfMixerFunc MixHrtfSamples = MixHrtf_C;
@ -94,16 +94,16 @@ static inline ResamplerFunc SelectResampler(enum Resampler resampler)
return Resample_lerp32_SSE2;
#endif
return Resample_lerp32_C;
case CubicResampler:
case FIR4Resampler:
#ifdef HAVE_SSE4_1
if((CPUCapFlags&CPU_CAP_SSE4_1))
return Resample_cubic32_SSE41;
return Resample_fir4_32_SSE41;
#endif
#ifdef HAVE_SSE2
if((CPUCapFlags&CPU_CAP_SSE2))
return Resample_cubic32_SSE2;
return Resample_fir4_32_SSE2;
#endif
return Resample_cubic32_C;
return Resample_fir4_32_C;
case ResamplerMax:
/* Shouldn't happen */
break;
@ -113,17 +113,26 @@ static inline ResamplerFunc SelectResampler(enum Resampler resampler)
}
static float lanc2(float x)
{
if(x == 0.0f)
return 1.0f;
if(fabsf(x) >= 2.0f)
return 0.0f;
return 2.0f*sinf(x*F_PI)*sinf(x*F_PI/2.0f) /
(F_PI*F_PI * x*x);
}
void aluInitMixer(void)
{
ALuint i;
for(i = 0;i < FRACTIONONE;i++)
{
ALfloat mu = (ALfloat)i / FRACTIONONE;
ALfloat mu2 = mu*mu, mu3 = mu*mu*mu;
CubicLUT[i][0] = -0.5f*mu3 + mu2 + -0.5f*mu;
CubicLUT[i][1] = 1.5f*mu3 + -2.5f*mu2 + 1.0f;
CubicLUT[i][2] = -1.5f*mu3 + 2.0f*mu2 + 0.5f*mu;
CubicLUT[i][3] = 0.5f*mu3 + -0.5f*mu2;
ResampleCoeffs[i][0] = lanc2(mu - -1.0f);
ResampleCoeffs[i][1] = lanc2(mu - 0.0f);
ResampleCoeffs[i][2] = lanc2(mu - 1.0f);
ResampleCoeffs[i][3] = lanc2(mu - 2.0f);
}
MixHrtfSamples = SelectHrtfMixer();

6
Alc/mixer_c.c
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@ -12,8 +12,8 @@ static inline ALfloat point32(const ALfloat *vals, ALuint UNUSED(frac))
{ return vals[0]; }
static inline ALfloat lerp32(const ALfloat *vals, ALuint frac)
{ return lerp(vals[0], vals[1], frac * (1.0f/FRACTIONONE)); }
static inline ALfloat cubic32(const ALfloat *vals, ALuint frac)
{ return cubic(vals[-1], vals[0], vals[1], vals[2], frac); }
static inline ALfloat fir4_32(const ALfloat *vals, ALuint frac)
{ return resample_fir4(vals[-1], vals[0], vals[1], vals[2], frac); }
const ALfloat *Resample_copy32_C(const ALfloat *src, ALuint UNUSED(frac),
ALuint UNUSED(increment), ALfloat *restrict dst, ALuint numsamples)
@ -45,7 +45,7 @@ const ALfloat *Resample_##Sampler##_C(const ALfloat *src, ALuint frac, \
DECL_TEMPLATE(point32)
DECL_TEMPLATE(lerp32)
DECL_TEMPLATE(cubic32)
DECL_TEMPLATE(fir4_32)
#undef DECL_TEMPLATE

6
Alc/mixer_defs.h
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@ -15,7 +15,7 @@ struct HrtfState;
const ALfloat *Resample_copy32_C(const ALfloat *src, ALuint frac, ALuint increment, ALfloat *restrict dst, ALuint dstlen);
const ALfloat *Resample_point32_C(const ALfloat *src, ALuint frac, ALuint increment, ALfloat *restrict dst, ALuint dstlen);
const ALfloat *Resample_lerp32_C(const ALfloat *src, ALuint frac, ALuint increment, ALfloat *restrict dst, ALuint dstlen);
const ALfloat *Resample_cubic32_C(const ALfloat *src, ALuint frac, ALuint increment, ALfloat *restrict dst, ALuint dstlen);
const ALfloat *Resample_fir4_32_C(const ALfloat *src, ALuint frac, ALuint increment, ALfloat *restrict dst, ALuint dstlen);
/* C mixers */
@ -54,9 +54,9 @@ const ALfloat *Resample_lerp32_SSE2(const ALfloat *src, ALuint frac, ALuint incr
const ALfloat *Resample_lerp32_SSE41(const ALfloat *src, ALuint frac, ALuint increment,
ALfloat *restrict dst, ALuint numsamples);
const ALfloat *Resample_cubic32_SSE2(const ALfloat *src, ALuint frac, ALuint increment,
const ALfloat *Resample_fir4_32_SSE2(const ALfloat *src, ALuint frac, ALuint increment,
ALfloat *restrict dst, ALuint numsamples);
const ALfloat *Resample_cubic32_SSE41(const ALfloat *src, ALuint frac, ALuint increment,
const ALfloat *Resample_fir4_32_SSE41(const ALfloat *src, ALuint frac, ALuint increment,
ALfloat *restrict dst, ALuint numsamples);
/* Neon mixers */

12
Alc/mixer_sse2.c
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@ -77,7 +77,7 @@ const ALfloat *Resample_lerp32_SSE2(const ALfloat *src, ALuint frac, ALuint incr
return dst;
}
const ALfloat *Resample_cubic32_SSE2(const ALfloat *src, ALuint frac, ALuint increment,
const ALfloat *Resample_fir4_32_SSE2(const ALfloat *src, ALuint frac, ALuint increment,
ALfloat *restrict dst, ALuint numsamples)
{
const __m128i increment4 = _mm_set1_epi32(increment*4);
@ -100,10 +100,10 @@ const ALfloat *Resample_cubic32_SSE2(const ALfloat *src, ALuint frac, ALuint inc
const __m128 val1 = _mm_loadu_ps(&src[pos_.i[1]]);
const __m128 val2 = _mm_loadu_ps(&src[pos_.i[2]]);
const __m128 val3 = _mm_loadu_ps(&src[pos_.i[3]]);
__m128 k0 = _mm_load_ps(CubicLUT[frac_.i[0]]);
__m128 k1 = _mm_load_ps(CubicLUT[frac_.i[1]]);
__m128 k2 = _mm_load_ps(CubicLUT[frac_.i[2]]);
__m128 k3 = _mm_load_ps(CubicLUT[frac_.i[3]]);
__m128 k0 = _mm_load_ps(ResampleCoeffs[frac_.i[0]]);
__m128 k1 = _mm_load_ps(ResampleCoeffs[frac_.i[1]]);
__m128 k2 = _mm_load_ps(ResampleCoeffs[frac_.i[2]]);
__m128 k3 = _mm_load_ps(ResampleCoeffs[frac_.i[3]]);
__m128 out;
k0 = _mm_mul_ps(k0, val0);
@ -130,7 +130,7 @@ const ALfloat *Resample_cubic32_SSE2(const ALfloat *src, ALuint frac, ALuint inc
for(;i < numsamples;i++)
{
dst[i] = cubic(src[pos], src[pos+1], src[pos+2], src[pos+3], frac);
dst[i] = resample_fir4(src[pos], src[pos+1], src[pos+2], src[pos+3], frac);
frac += increment;
pos += frac>>FRACTIONBITS;

12
Alc/mixer_sse41.c
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@ -81,7 +81,7 @@ const ALfloat *Resample_lerp32_SSE41(const ALfloat *src, ALuint frac, ALuint inc
return dst;
}
const ALfloat *Resample_cubic32_SSE41(const ALfloat *src, ALuint frac, ALuint increment,
const ALfloat *Resample_fir4_32_SSE41(const ALfloat *src, ALuint frac, ALuint increment,
ALfloat *restrict dst, ALuint numsamples)
{
const __m128i increment4 = _mm_set1_epi32(increment*4);
@ -104,10 +104,10 @@ const ALfloat *Resample_cubic32_SSE41(const ALfloat *src, ALuint frac, ALuint in
const __m128 val1 = _mm_loadu_ps(&src[pos_.i[1]]);
const __m128 val2 = _mm_loadu_ps(&src[pos_.i[2]]);
const __m128 val3 = _mm_loadu_ps(&src[pos_.i[3]]);
__m128 k0 = _mm_load_ps(CubicLUT[frac_.i[0]]);
__m128 k1 = _mm_load_ps(CubicLUT[frac_.i[1]]);
__m128 k2 = _mm_load_ps(CubicLUT[frac_.i[2]]);
__m128 k3 = _mm_load_ps(CubicLUT[frac_.i[3]]);
__m128 k0 = _mm_load_ps(ResampleCoeffs[frac_.i[0]]);
__m128 k1 = _mm_load_ps(ResampleCoeffs[frac_.i[1]]);
__m128 k2 = _mm_load_ps(ResampleCoeffs[frac_.i[2]]);
__m128 k3 = _mm_load_ps(ResampleCoeffs[frac_.i[3]]);
__m128 out;
k0 = _mm_mul_ps(k0, val0);
@ -140,7 +140,7 @@ const ALfloat *Resample_cubic32_SSE41(const ALfloat *src, ALuint frac, ALuint in
for(;i < numsamples;i++)
{
dst[i] = cubic(src[pos], src[pos+1], src[pos+2], src[pos+3], frac);
dst[i] = resample_fir4(src[pos], src[pos+1], src[pos+2], src[pos+3], frac);
frac += increment;
pos += frac>>FRACTIONBITS;

2
OpenAL32/Include/alMain.h
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@ -528,7 +528,7 @@ enum DistanceModel {
enum Resampler {
PointResampler,
LinearResampler,
CubicResampler,
FIR4Resampler,
ResamplerMax,
};

6
OpenAL32/Include/alu.h
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@ -202,16 +202,16 @@ inline ALuint64 clampu64(ALuint64 val, ALuint64 min, ALuint64 max)
{ return minu64(max, maxu64(min, val)); }
extern alignas(16) ALfloat CubicLUT[FRACTIONONE][4];
extern alignas(16) ALfloat ResampleCoeffs[FRACTIONONE][4];
inline ALfloat lerp(ALfloat val1, ALfloat val2, ALfloat mu)
{
return val1 + (val2-val1)*mu;
}
inline ALfloat cubic(ALfloat val0, ALfloat val1, ALfloat val2, ALfloat val3, ALuint frac)
inline ALfloat resample_fir4(ALfloat val0, ALfloat val1, ALfloat val2, ALfloat val3, ALuint frac)
{
const ALfloat *k = CubicLUT[frac];
const ALfloat *k = ResampleCoeffs[frac];
return k[0]*val0 + k[1]*val1 + k[2]*val2 + k[3]*val3;
}

4
OpenAL32/alSource.c
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@ -42,12 +42,12 @@ enum Resampler DefaultResampler = LinearResampler;
const ALsizei ResamplerPadding[ResamplerMax] = {
0, /* Point */
1, /* Linear */
2, /* Cubic */
2, /* FIR4 */
};
const ALsizei ResamplerPrePadding[ResamplerMax] = {
0, /* Point */
0, /* Linear */
1, /* Cubic */
1, /* FIR4 */
};

2
alsoftrc.sample
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@ -129,7 +129,7 @@
# Selects the resampler used when mixing sources. Valid values are:
# point - nearest sample, no interpolation
# linear - extrapolates samples using a linear slope between samples
# cubic - extrapolates samples using a Catmull-Rom spline
# sinc4 - extrapolates samples using a 4-point sinc/lanczos filter
# Specifying other values will result in using the default (linear).
#resampler = linear

2
utils/alsoft-config/mainwindow.cpp
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@ -63,7 +63,7 @@ static const struct {
{ "Default", "" },
{ "Point (low quality, fast)", "point" },
{ "Linear (basic quality, fast)", "linear" },
{ "Cubic Spline (good quality)", "cubic" },
{ "Sinc/Lanczos (good quality)", "sinc4" },
{ "", "" }
}, stereoModeList[] = {