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Avoid sin()/cos() calls for pitch reference

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This commit is contained in:
Jean-Marc Valin 2023-08-01 23:48:34 -04:00
parent 83e95a5ce6
commit 3eac8c12e4
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GPG key ID: 531A52533318F00A
2 changed files with 28 additions and 8 deletions
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34
dnn/fwgan.c
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@ -48,14 +48,33 @@
#define FWGAN_FEATURES (NB_FEATURES-1)
static void pitch_embeddings(float *pembed, double *phase, double w0) {
static void pitch_embeddings(float *pembed, float *phase, double w0) {
int i;
/* FIXME: This could be speeded up by making phase a unit-norm complex value, rotating it
by exp(-i*w0) each sample, and renormalizing once in while. */
float wreal, wimag;
#if 1
/* This Taylor expansion should be good enough since w0 is always small. */
float w2 = w0*w0;
wreal = 1 - .5*w2*(1.f - 0.083333333f*w2);
wimag = w0*(1 - 0.166666667f*w2*(1.f - 0.05f*w2));
#else
wreal = cos(w0);
wimag = sin(w0);
#endif
/* Speed-up phase reference by making phase a unit-norm complex value and rotating it
by exp(-i*w0) each sample. */
for (i=0;i<SUBFRAME_SIZE;i++) {
*phase += w0;
pembed[i] = sin(*phase);
pembed[SUBFRAME_SIZE+i] = cos(*phase);
float tmp;
tmp = phase[0]*wreal - phase[1]*wimag;
phase[1] = phase[0]*wimag + phase[1]*wreal;
phase[0] = tmp;
pembed[i] = phase[1];
pembed[SUBFRAME_SIZE+i] = phase[0];
}
/* Renormalize once per sub-frame, though we could probably do it even less frequently. */
{
float r = 1.f/sqrt(phase[0]*phase[0] + phase[1]*phase[1]);
phase[0] *= r;
phase[1] *= r;
}
}
@ -76,6 +95,7 @@ void fwgan_cont(FWGANState *st, const float *pcm0, const float *features0)
float tmp1[MAX_CONT_SIZE];
float tmp2[MAX_CONT_SIZE];
FWGAN *model;
st->embed_phase[0] = 1;
model = &st->model;
norm2 = celt_inner_prod(pcm0, pcm0, CONT_PCM_INPUTS, st->arch);
norm_1 = 1.f/sqrt(1e-8f + norm2);
@ -158,7 +178,7 @@ static void run_fwgan_subframe(FWGANState *st, float *pcm, const float *cond, do
FWGAN *model;
model = &st->model;
pitch_embeddings(pembed, &st->embed_phase, w0);
pitch_embeddings(pembed, st->embed_phase, w0);
/* Interleave bfcc_cond and pembed for each subframe in feat_in. */
OPUS_COPY(&feat_in[BFCC_WITH_CORR_UPSAMPLER_FC_OUT_SIZE/4], &cond[0], BFCC_WITH_CORR_UPSAMPLER_FC_OUT_SIZE/4);
OPUS_COPY(&feat_in[0], &pembed[0], FWGAN_FRAME_SIZE/2);

2
dnn/fwgan.h
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@ -45,7 +45,7 @@ typedef struct {
FWGAN model;
int arch;
int cont_initialized;
double embed_phase;
float embed_phase[2];
float last_gain;
float last_lpc[LPC_ORDER];
float syn_mem[LPC_ORDER];