AuroraMiddleware/AuroraOpenALSoft
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Properly handle input samples for changes with the FIR coefficients

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This makes sure previously processed samples are not changed due to changes in
the FIR filter. It also applies the coefficients in ascending order with the
values, to improve caching.
This commit is contained in:
Chris Robinson 2011-07-03 02:14:33 -07:00
parent ac7ca07221
commit eefda551de
1 changed files with 25 additions and 28 deletions
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53
Alc/mixer.c
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@ -103,6 +103,7 @@ static void Mix_Hrtf_##T##_##sampler(ALsource *Source, ALCdevice *Device, \
ALfloat *RESTRICT History = Source->HrtfHistory[i]; \
ALfloat (*RESTRICT Values)[2] = Source->HrtfValues[i]; \
ALuint Offset = Source->HrtfOffset + OutPos; \
ALfloat left, right; \
\
pos = 0; \
frac = *DataPosFrac; \
@ -113,17 +114,13 @@ static void Mix_Hrtf_##T##_##sampler(ALsource *Source, ALCdevice *Device, \
value = lpFilter2PC(DryFilter, i, value); \
\
History[Offset&SRC_HISTORY_MASK] = value; \
left = History[(Offset-Delay[0])&SRC_HISTORY_MASK]; \
right = History[(Offset-Delay[1])&SRC_HISTORY_MASK]; \
\
Values[Offset&HRIR_MASK][0] = \
History[(Offset-Delay[0])&SRC_HISTORY_MASK];\
Values[Offset&HRIR_MASK][1] = \
History[(Offset-Delay[1])&SRC_HISTORY_MASK];\
for(c = 0;c < HRIR_LENGTH;c++) \
{ \
const ALuint off = (Offset-c)&HRIR_MASK; \
ClickRemoval[FRONT_LEFT] -= Values[off][0] * Coeffs[c][0]; \
ClickRemoval[FRONT_RIGHT] -= Values[off][1] * Coeffs[c][1]; \
} \
ClickRemoval[FRONT_LEFT] -= Values[(Offset+1)&HRIR_MASK][0] + \
Coeffs[0][0] * left; \
ClickRemoval[FRONT_RIGHT] -= Values[(Offset+1)&HRIR_MASK][1] + \
Coeffs[0][1] * right; \
} \
for(BufferIdx = 0;BufferIdx < BufferSize;BufferIdx++) \
{ \
@ -131,18 +128,22 @@ static void Mix_Hrtf_##T##_##sampler(ALsource *Source, ALCdevice *Device, \
value = lpFilter2P(DryFilter, i, value); \
\
History[Offset&SRC_HISTORY_MASK] = value; \
left = History[(Offset-Delay[0])&SRC_HISTORY_MASK]; \
right = History[(Offset-Delay[1])&SRC_HISTORY_MASK]; \
\
Values[Offset&HRIR_MASK][0] = 0.0f; \
Values[Offset&HRIR_MASK][1] = 0.0f; \
Offset++; \
\
Values[Offset&HRIR_MASK][0] = \
History[(Offset-Delay[0])&SRC_HISTORY_MASK];\
Values[Offset&HRIR_MASK][1] = \
History[(Offset-Delay[1])&SRC_HISTORY_MASK];\
for(c = 0;c < HRIR_LENGTH;c++) \
{ \
const ALuint off = (Offset-c)&HRIR_MASK; \
DryBuffer[OutPos][FRONT_LEFT] += Values[off][0] * Coeffs[c][0];\
DryBuffer[OutPos][FRONT_RIGHT] += Values[off][1] * Coeffs[c][1];\
const ALuint off = (Offset+c)&HRIR_MASK; \
Values[off][0] += Coeffs[c][0] * left; \
Values[off][1] += Coeffs[c][1] * right; \
} \
Offset++; \
\
DryBuffer[OutPos][FRONT_LEFT] += Values[Offset&HRIR_MASK][0]; \
DryBuffer[OutPos][FRONT_RIGHT] += Values[Offset&HRIR_MASK][1]; \
\
frac += increment; \
pos += frac>>FRACTIONBITS; \
@ -155,17 +156,13 @@ static void Mix_Hrtf_##T##_##sampler(ALsource *Source, ALCdevice *Device, \
value = lpFilter2PC(DryFilter, i, value); \
\
History[Offset&SRC_HISTORY_MASK] = value; \
left = History[(Offset-Delay[0])&SRC_HISTORY_MASK]; \
right = History[(Offset-Delay[1])&SRC_HISTORY_MASK]; \
\
Values[Offset&HRIR_MASK][0] = \
History[(Offset-Delay[0])&SRC_HISTORY_MASK];\
Values[Offset&HRIR_MASK][1] = \
History[(Offset-Delay[1])&SRC_HISTORY_MASK];\
for(c = 0;c < HRIR_LENGTH;c++) \
{ \
const ALuint off = (Offset-c)&HRIR_MASK; \
PendingClicks[FRONT_LEFT] += Values[off][0] * Coeffs[c][0]; \
PendingClicks[FRONT_RIGHT] += Values[off][1] * Coeffs[c][1]; \
} \
PendingClicks[FRONT_LEFT] += Values[(Offset+1)&HRIR_MASK][0] + \
Coeffs[0][0] * left; \
PendingClicks[FRONT_RIGHT] += Values[(Offset+1)&HRIR_MASK][1] + \
Coeffs[0][1] * right; \
} \
OutPos -= BufferSize; \
} \