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Use the bsinc resampler for the converter

master
Chris Robinson 2017-06-24 10:52:26 -07:00
parent d1bb04d588
commit c465718ddd
4 changed files with 18 additions and 7 deletions
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2
Alc/ALu.c
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@ -214,7 +214,7 @@ static aluVector aluMatrixfVector(const aluMatrixf *mtx, const aluVector *vec)
* modified for use with an interpolated increment for buttery-smooth pitch
* changes.
*/
static ALboolean BsincPrepare(const ALuint increment, BsincState *state)
ALboolean BsincPrepare(const ALuint increment, BsincState *state)
{
static const ALfloat scaleBase = 1.510578918e-01f, scaleRange = 1.177936623e+00f;
static const ALuint m[BSINC_SCALE_COUNT] = { 24, 24, 24, 24, 24, 24, 24, 20, 20, 20, 16, 16, 16, 12, 12, 12 };

20
Alc/converter.c
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@ -9,6 +9,7 @@
SampleConverter *CreateSampleConverter(enum DevFmtType srcType, enum DevFmtType dstType, ALsizei numchans, ALsizei srcRate, ALsizei dstRate)
{
SampleConverter *converter;
FPUCtl oldMode;
if(numchans <= 0 || srcRate <= 0 || dstRate <= 0)
return NULL;
@ -21,8 +22,10 @@ SampleConverter *CreateSampleConverter(enum DevFmtType srcType, enum DevFmtType
converter->mDstTypeSize = BytesFromDevFmt(dstType);
converter->mSrcPrepCount = 0;
converter->mFracOffset = 0;
/* Have to set the mixer FPU mode since that's what the resampler code expects. */
SetMixerFPUMode(&oldMode);
converter->mIncrement = (ALsizei)clampu64((ALuint64)srcRate*FRACTIONONE/dstRate,
1, MAX_PITCH*FRACTIONONE);
if(converter->mIncrement == FRACTIONONE)
@ -30,8 +33,10 @@ SampleConverter *CreateSampleConverter(enum DevFmtType srcType, enum DevFmtType
else
{
/* TODO: Allow other resamplers. */
converter->mResample = SelectResampler(LinearResampler);
BsincPrepare(converter->mIncrement, &converter->mState.bsinc);
converter->mResample = SelectResampler(BSincResampler);
}
RestoreFPUMode(&oldMode);
return converter;
}
@ -113,17 +118,17 @@ static void LoadSamples(ALfloat *dst, const ALvoid *src, ALint srcstep, enum Dev
static inline ALbyte ALbyte_Sample(ALfloat val)
{ return (ALbyte)clampf(val*128.0f, -128.0f, 127.0f); }
{ return fastf2i(clampf(val*128.0f, -128.0f, 127.0f)); }
static inline ALubyte ALubyte_Sample(ALfloat val)
{ return ALbyte_Sample(val)+128; }
static inline ALshort ALshort_Sample(ALfloat val)
{ return (ALshort)clampf(val*32768.0f, -32768.0f, 32767.0f); }
{ return fastf2i(clampf(val*32768.0f, -32768.0f, 32767.0f)); }
static inline ALushort ALushort_Sample(ALfloat val)
{ return ALshort_Sample(val)+32768; }
static inline ALint ALint_Sample(ALfloat val)
{ return (ALint)clampf(val*16777216.0f, -16777216.0f, 16777215.0f) << 7; }
{ return fastf2i(clampf(val*16777216.0f, -16777216.0f, 16777215.0f)) << 7; }
static inline ALuint ALuint_Sample(ALfloat val)
{ return ALint_Sample(val)+INT_MAX+1; }
@ -224,7 +229,9 @@ ALsizei SampleConverterInput(SampleConverter *converter, const ALvoid **src, ALs
const ALsizei DstFrameSize = converter->mNumChannels * converter->mDstTypeSize;
const ALsizei increment = converter->mIncrement;
ALsizei pos = 0;
FPUCtl oldMode;
SetMixerFPUMode(&oldMode);
while(pos < dstframes && *srcframes > 0)
{
ALfloat *restrict SrcData = ASSUME_ALIGNED(converter->mSrcSamples, 16);
@ -312,7 +319,7 @@ ALsizei SampleConverterInput(SampleConverter *converter, const ALvoid **src, ALs
}
/* Now resample, and store the result in the output buffer. */
ResampledData = converter->mResample(NULL,
ResampledData = converter->mResample(&converter->mState,
SrcData+MAX_PRE_SAMPLES, DataPosFrac, increment,
DstData, DstSize
);
@ -336,6 +343,7 @@ ALsizei SampleConverterInput(SampleConverter *converter, const ALvoid **src, ALs
dst = (ALbyte*)dst + DstFrameSize*DstSize;
pos += DstSize;
}
RestoreFPUMode(&oldMode);
return pos;
}

1
Alc/converter.h
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@ -19,6 +19,7 @@ typedef struct SampleConverter {
ALsizei mFracOffset;
ALsizei mIncrement;
InterpState mState;
ResamplerFunc mResample;
alignas(16) ALfloat mSrcSamples[BUFFERSIZE];

2
OpenAL32/Include/alu.h
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@ -85,6 +85,8 @@ typedef union InterpState {
BsincState bsinc;
} InterpState;
ALboolean BsincPrepare(const ALuint increment, BsincState *state);
typedef const ALfloat* (*ResamplerFunc)(const InterpState *state,
const ALfloat *restrict src, ALsizei frac, ALint increment,
ALfloat *restrict dst, ALsizei dstlen