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resample: optimize phase scaling

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Precalculate the constant factor to avoid a division for each sample.
This commit is contained in:
Wim Taymans 2025-07-23 14:11:11 +02:00
parent bacaec1a48
commit 418b7198ee
2 changed files with 7 additions and 6 deletions
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12
spa/plugins/audioconvert/resample-native-impl.h
View file

@ -30,6 +30,7 @@ struct native_data {
uint32_t in_rate;
uint32_t out_rate;
float phase;
float pm;
uint32_t inc;
uint32_t frac;
uint32_t filter_stride;
@ -85,7 +86,7 @@ DEFINE_RESAMPLER(full,arch) \
{ \
struct native_data *data = r->data; \
uint32_t n_taps = data->n_taps, stride = data->filter_stride_os; \
uint32_t index, phase, n_phases = data->out_rate; \
uint32_t index, phase, out_rate = data->out_rate; \
uint32_t c, o, olen = *out_len, ilen = *in_len; \
uint32_t inc = data->inc, frac = data->frac, ch = r->channels; \
\
@ -99,7 +100,7 @@ DEFINE_RESAMPLER(full,arch) \
inner_product_##arch(&d[o], &s[index], \
filter, n_taps); \
} \
INC(index, phase, n_phases); \
INC(index, phase, out_rate); \
} \
*in_len = index; \
*out_len = o; \
@ -111,16 +112,15 @@ DEFINE_RESAMPLER(inter,arch) \
{ \
struct native_data *data = r->data; \
uint32_t index, stride = data->filter_stride; \
uint32_t n_phases = data->n_phases, out_rate = data->out_rate; \
uint32_t n_taps = data->n_taps; \
uint32_t n_taps = data->n_taps, out_rate = data->out_rate; \
uint32_t c, o, olen = *out_len, ilen = *in_len; \
uint32_t inc = data->inc, frac = data->frac, ch = r->channels; \
float phase; \
float phase, pm = data->pm; \
\
index = ioffs; \
phase = data->phase; \
for (o = ooffs; o < olen && index + n_taps <= ilen; o++) { \
float ph = phase * n_phases / out_rate; \
float ph = phase * pm; \
uint32_t offset = (uint32_t)floorf(ph); \
float *filter0 = &data->filter[(offset+0) * stride]; \
float *filter1 = &data->filter[(offset+1) * stride]; \

1
spa/plugins/audioconvert/resample-native.c
View file

@ -362,6 +362,7 @@ int resample_native_init(struct resample *r)
d->in_rate = in_rate;
d->out_rate = out_rate;
d->gcd = gcd;
d->pm = (float)n_phases / r->o_rate;
d->filter = SPA_PTROFF_ALIGN(d, sizeof(struct native_data), 64, float);
d->hist_mem = SPA_PTROFF_ALIGN(d->filter, filter_size, 64, float);
d->history = SPA_PTROFF(d->hist_mem, history_size, float*);