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Accumulate the B-Format HRTF responses using doubles

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The final result is still truncated to single-precision float, but this should
keep the responses more stable as it accumulates the various inputs.
This commit is contained in:
Chris Robinson 2018-04-17 21:27:47 -07:00
parent e619b64175
commit 09194fd488
1 changed files with 24 additions and 9 deletions
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33
Alc/hrtf.c
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@ -202,6 +202,7 @@ void BuildBFormatHrtf(const struct Hrtf *Hrtf, DirectHrtfState *state, ALsizei N
*/
#define NUM_BANDS 2
BandSplitter splitter;
ALdouble (*tmpres)[HRIR_LENGTH][2];
ALsizei idx[HRTF_AMBI_MAX_CHANNELS];
ALsizei min_delay = HRTF_HISTORY_LENGTH;
ALfloat temps[3][HRIR_LENGTH];
@ -232,6 +233,8 @@ void BuildBFormatHrtf(const struct Hrtf *Hrtf, DirectHrtfState *state, ALsizei N
min_delay = mini(min_delay, mini(Hrtf->delays[idx[c]][0], Hrtf->delays[idx[c]][1]));
}
tmpres = al_calloc(16, NumChannels * sizeof(*tmpres));
memset(temps, 0, sizeof(temps));
bandsplit_init(&splitter, 400.0f / (ALfloat)Hrtf->sampleRate);
for(c = 0;c < AmbiCount;c++)
@ -248,13 +251,14 @@ void BuildBFormatHrtf(const struct Hrtf *Hrtf, DirectHrtfState *state, ALsizei N
{
for(i = 0;i < NumChannels;++i)
{
ALfloat hfgain = AmbiOrderHFGain[(ALsizei)floor(sqrt(i))];
ALdouble mult = (ALdouble)AmbiOrderHFGain[(ALsizei)floor(sqrt(i))] *
AmbiMatrix[c][i];
ALsizei lidx = ldelay, ridx = rdelay;
ALsizei j = 0;
while(lidx < HRIR_LENGTH && ridx < HRIR_LENGTH && j < Hrtf->irSize)
{
state->Chan[i].Coeffs[lidx++][0] += fir[j][0] * AmbiMatrix[c][i] * hfgain;
state->Chan[i].Coeffs[ridx++][1] += fir[j][1] * AmbiMatrix[c][i] * hfgain;
tmpres[i][lidx++][0] += fir[j][0] * mult;
tmpres[i][ridx++][1] += fir[j][1] * mult;
j++;
}
}
@ -273,12 +277,11 @@ void BuildBFormatHrtf(const struct Hrtf *Hrtf, DirectHrtfState *state, ALsizei N
ALfloat hfgain = AmbiOrderHFGain[(ALsizei)floor(sqrt(i))];
for(b = 0;b < NUM_BANDS;b++)
{
ALdouble mult = AmbiMatrix[c][i] * (ALdouble)((b==0) ? hfgain : 1.0);
ALsizei lidx = ldelay;
ALsizei j = 0;
while(lidx < HRIR_LENGTH)
state->Chan[i].Coeffs[lidx++][0] += temps[b][j++] * AmbiMatrix[c][i] *
hfgain;
hfgain = 1.0f;
tmpres[i][lidx++][0] += temps[b][j++] * mult;
}
}
@ -294,12 +297,11 @@ void BuildBFormatHrtf(const struct Hrtf *Hrtf, DirectHrtfState *state, ALsizei N
ALfloat hfgain = AmbiOrderHFGain[(ALsizei)floor(sqrt(i))];
for(b = 0;b < NUM_BANDS;b++)
{
ALdouble mult = AmbiMatrix[c][i] * (ALdouble)((b==0) ? hfgain : 1.0);
ALsizei ridx = rdelay;
ALsizei j = 0;
while(ridx < HRIR_LENGTH)
state->Chan[i].Coeffs[ridx++][1] += temps[b][j++] * AmbiMatrix[c][i] *
hfgain;
hfgain = 1.0f;
tmpres[i][ridx++][1] += temps[b][j++] * mult;
}
}
}
@ -308,6 +310,19 @@ void BuildBFormatHrtf(const struct Hrtf *Hrtf, DirectHrtfState *state, ALsizei N
max_length += MOD_IR_SIZE-1;
max_length -= max_length%MOD_IR_SIZE;
for(i = 0;i < NumChannels;++i)
{
int idx;
for(idx = 0;idx < HRIR_LENGTH;idx++)
{
state->Chan[i].Coeffs[idx][0] = (ALfloat)tmpres[i][idx][0];
state->Chan[i].Coeffs[idx][1] = (ALfloat)tmpres[i][idx][1];
}
}
al_free(tmpres);
tmpres = NULL;
TRACE("Skipped delay: %d, new FIR length: %d\n", min_delay, max_length);
state->IrSize = max_length;
#undef NUM_BANDS