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delay: improve delay performance

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Use a wrap around delay ringbuffer. We can then avoid some modulo
arithmetic and read more efficiently.

Also handle the delay convolver case better by reversing the taps and
reading the taps and delay buffer without extra overhead.
This commit is contained in:
Wim Taymans 2024-10-15 12:14:57 +02:00
parent 668055e612
commit a57f2f25b6
4 changed files with 31 additions and 14 deletions
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26
spa/plugins/audioconvert/delay.h
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@ -14,14 +14,15 @@ static inline void delay_run(float *buffer, uint32_t *pos,
float *dst, const float *src, const float vol, uint32_t n_samples)
{
uint32_t i;
uint32_t p = *pos;
uint32_t w = *pos;
uint32_t o = n_buffer - delay;
for (i = 0; i < n_samples; i++) {
buffer[p] = src[i];
dst[i] = buffer[(p - delay) & (n_buffer-1)] * vol;
p = (p + 1) & (n_buffer-1);
buffer[w] = buffer[w + n_buffer] = src[i];
dst[i] = buffer[w + o] * vol;
w = w + 1 >= n_buffer ? 0 : w + 1;
}
*pos = p;
*pos = w;
}
static inline void delay_convolve_run(float *buffer, uint32_t *pos,
@ -30,19 +31,24 @@ static inline void delay_convolve_run(float *buffer, uint32_t *pos,
float *dst, const float *src, const float vol, uint32_t n_samples)
{
uint32_t i, j;
uint32_t p = *pos;
uint32_t w = *pos;
uint32_t o = n_buffer - delay - n_taps-1;
if (n_taps == 1) {
delay_run(buffer, pos, n_buffer, delay, dst, src, vol, n_samples);
return;
}
for (i = 0; i < n_samples; i++) {
float sum = 0.0f;
buffer[p] = src[i];
buffer[w] = buffer[w + n_buffer] = src[i];
for (j = 0; j < n_taps; j++)
sum += (taps[j] * buffer[((p - delay) - j) & (n_buffer-1)]);
sum += taps[j] * buffer[w+o+j];
dst[i] = sum * vol;
p = (p + 1) & (n_buffer-1);
w = w + 1 >= n_buffer ? 0 : w + 1;
}
*pos = p;
*pos = w;
}
#ifdef __cplusplus