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Make the bsinc l and m coefficients unsigned

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This commit is contained in:
Chris Robinson 2019-09-17 18:38:46 -07:00
parent 1da7512628
commit aca9f4e095
5 changed files with 25 additions and 29 deletions
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4
alc/alu.h
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@ -67,8 +67,8 @@ extern Resampler ResamplerDefault;
*/
struct BsincState {
ALfloat sf; /* Scale interpolation factor. */
ALsizei m; /* Coefficient count. */
ALsizei l; /* Left coefficient offset. */
ALuint m; /* Coefficient count. */
ALuint l; /* Left coefficient offset. */
/* Filter coefficients, followed by the scale, phase, and scale-phase
* delta coefficients. Starting at phase index 0, each subsequent phase
* index follows contiguously.

12
alc/mixer/mixer_c.cpp
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@ -21,7 +21,7 @@ inline ALfloat do_cubic(const InterpState&, const ALfloat *RESTRICT vals, const
{ return cubic(vals[0], vals[1], vals[2], vals[3], static_cast<float>(frac)*(1.0f/FRACTIONONE)); }
inline ALfloat do_bsinc(const InterpState &istate, const ALfloat *RESTRICT vals, const ALuint frac)
{
ASSUME(istate.bsinc.m > 0);
const size_t m{istate.bsinc.m};
// Calculate the phase index and factor.
#define FRAC_PHASE_BITDIFF (FRACTIONBITS-BSINC_PHASE_BITS)
@ -30,14 +30,14 @@ inline ALfloat do_bsinc(const InterpState &istate, const ALfloat *RESTRICT vals,
(1.0f/(1<<FRAC_PHASE_BITDIFF))};
#undef FRAC_PHASE_BITDIFF
const ALfloat *fil{istate.bsinc.filter + istate.bsinc.m*static_cast<ptrdiff_t>(pi*4)};
const ALfloat *scd{fil + istate.bsinc.m};
const ALfloat *phd{scd + istate.bsinc.m};
const ALfloat *spd{phd + istate.bsinc.m};
const ALfloat *fil{istate.bsinc.filter + m*pi*4};
const ALfloat *scd{fil + m};
const ALfloat *phd{scd + m};
const ALfloat *spd{phd + m};
// Apply the scale and phase interpolated filter.
ALfloat r{0.0f};
for(ALsizei j_f{0};j_f < istate.bsinc.m;j_f++)
for(size_t j_f{0};j_f < m;j_f++)
r += (fil[j_f] + istate.bsinc.sf*scd[j_f] + pf*(phd[j_f] + istate.bsinc.sf*spd[j_f])) * vals[j_f];
return r;
}

11
alc/mixer/mixer_neon.cpp
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@ -74,9 +74,7 @@ const ALfloat *Resample_<BSincTag,NEONTag>(const InterpState *state, const ALflo
{
const ALfloat *const filter{state->bsinc.filter};
const float32x4_t sf4{vdupq_n_f32(state->bsinc.sf)};
const ptrdiff_t m{state->bsinc.m};
ASSUME(m > 0);
const size_t m{state->bsinc.m};
src -= state->bsinc.l;
for(float &out_sample : dst)
@ -92,11 +90,11 @@ const ALfloat *Resample_<BSincTag,NEONTag>(const InterpState *state, const ALflo
float32x4_t r4{vdupq_n_f32(0.0f)};
{
const float32x4_t pf4{vdupq_n_f32(pf)};
const float *fil{filter + m*static_cast<ptrdiff_t>(pi*4)};
const float *fil{filter + m*pi*4};
const float *scd{fil + m};
const float *phd{scd + m};
const float *spd{phd + m};
ptrdiff_t td{m >> 2};
size_t td{m >> 2};
size_t j{0u};
do {
@ -110,8 +108,7 @@ const ALfloat *Resample_<BSincTag,NEONTag>(const InterpState *state, const ALflo
j += 4;
} while(--td);
}
r4 = vaddq_f32(r4, vcombine_f32(vrev64_f32(vget_high_f32(r4)),
vrev64_f32(vget_low_f32(r4))));
r4 = vaddq_f32(r4, vrev64q_f32(r4));
out_sample = vget_lane_f32(vadd_f32(vget_low_f32(r4), vget_high_f32(r4)), 0);
frac += increment;

6
alc/mixer/mixer_sse.cpp
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@ -19,9 +19,7 @@ const ALfloat *Resample_<BSincTag,SSETag>(const InterpState *state, const ALfloa
{
const ALfloat *const filter{state->bsinc.filter};
const __m128 sf4{_mm_set1_ps(state->bsinc.sf)};
const ptrdiff_t m{state->bsinc.m};
ASSUME(m > 0);
const size_t m{state->bsinc.m};
src -= state->bsinc.l;
for(float &out_sample : dst)
@ -41,7 +39,7 @@ const ALfloat *Resample_<BSincTag,SSETag>(const InterpState *state, const ALfloa
const float *scd{fil + m};
const float *phd{scd + m};
const float *spd{phd + m};
ptrdiff_t td{m >> 2};
size_t td{m >> 2};
size_t j{0u};
#define MLA4(x, y, z) _mm_add_ps(x, _mm_mul_ps(y, z))

15
native-tools/bsincgen.c
View File

@ -300,17 +300,17 @@ static void BsiGenerateTables(FILE *output, const char *tabname, const double re
fprintf(output, " /* scaleBase */ %.9ef, /* scaleRange */ %.9ef,\n", scaleBase, 1.0 / scaleRange);
fprintf(output, " /* m */ {");
fprintf(output, " %d", mt[0]);
fprintf(output, " %du", mt[0]);
for(si = 1; si < BSINC_SCALE_COUNT; si++)
fprintf(output, ", %d", mt[si]);
fprintf(output, ", %du", mt[si]);
fprintf(output, " },\n");
fprintf(output, " /* filterOffset */ {");
fprintf(output, " %d", 0);
fprintf(output, " %du", 0);
i = mt[0]*4*BSINC_PHASE_COUNT;
for(si = 1; si < BSINC_SCALE_COUNT; si++)
{
fprintf(output, ", %d", i);
fprintf(output, ", %du", i);
i += mt[si]*4*BSINC_PHASE_COUNT;
}
@ -344,14 +344,15 @@ int main(int argc, char *argv[])
else
output = stdout;
fprintf(output, "/* Generated by bsincgen, do not edit! */\n\n"
fprintf(output, "/* Generated by bsincgen, do not edit! */\n"
"#pragma once\n\n"
"static_assert(BSINC_SCALE_COUNT == %d, \"Unexpected BSINC_SCALE_COUNT value!\");\n"
"static_assert(BSINC_PHASE_COUNT == %d, \"Unexpected BSINC_PHASE_COUNT value!\");\n"
"static_assert(FRACTIONONE == %d, \"Unexpected FRACTIONONE value!\");\n\n"
"struct BSincTable {\n"
" const float scaleBase, scaleRange;\n"
" const int m[BSINC_SCALE_COUNT];\n"
" const int filterOffset[BSINC_SCALE_COUNT];\n"
" const unsigned int m[BSINC_SCALE_COUNT];\n"
" const unsigned int filterOffset[BSINC_SCALE_COUNT];\n"
" const float *Tab;\n"
"};\n\n", BSINC_SCALE_COUNT, BSINC_PHASE_COUNT, FRACTIONONE);
/* A 23rd order filter with a -60dB drop at nyquist. */