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Don't check for buffer wrap unless necessary this cycle.

master
Peter Nelson 2013-02-06 01:12:13 +00:00
parent 14441af2c4
commit 2a421ff619
1 changed files with 18 additions and 20 deletions
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38
ptap/ptap.cpp
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@ -24,8 +24,9 @@ struct PTap
Tap tap[TAPS + CHANNELS];
float *buffers[TAPS]; ///< Tap audio buffers
float *wp[TAPS]; ///< Write pointers
float *buffers[TAPS]; ///< Tap audio buffers
const float *buffers_end[TAPS]; ///< Audio buffer end points
float *wp[TAPS]; ///< Write pointers
float *in_l;
float *in_r;
@ -57,6 +58,7 @@ static LV2_Handle ptap_instantiate(
return NULL;
}
ptap->buffers_end[i] = ptap->buffers[i] + ptap->buffer_max;
ptap->wp[i] = ptap->buffers[i];
}
@ -109,6 +111,7 @@ static void ptap_run(LV2_Handle lv2instance, uint32_t sample_count)
const float *readp[TAPS + CHANNELS];
float gain[TAPS + CHANNELS];
bool check_overflow = false;
/* Position read pointers behind write pointers */
for (int i = 0; i < TAPS; i++) {
@ -119,6 +122,8 @@ static void ptap_run(LV2_Handle lv2instance, uint32_t sample_count)
if (readp[i] < ptap->buffers[i]) {
readp[i] += ptap->buffer_max;
}
if (ptap->wp[i] + sample_count >= ptap->buffers_end[i]) check_overflow = true;
if (readp[i] + sample_count >= ptap->buffers_end[i]) check_overflow = true;
gain[i] = *ptap->tap[i].gain;
}
@ -134,35 +139,28 @@ static void ptap_run(LV2_Handle lv2instance, uint32_t sample_count)
float rp[TAPS + CHANNELS];
float wp[TAPS + CHANNELS];
for (int i = 0; i < TAPS + CHANNELS; i++) {
rp[i] = *readp[i]++;
}
/* Read input to local buffers */
for (int i = 0; i < TAPS + CHANNELS; i++) rp[i] = *readp[i]++;
/* Process delays */
for (int i = 0; i < TAPS + CHANNELS; i++) {
const Tap *tap = &ptap->tap[i];
float sample = 0;
for (int j = 0; j < TAPS + CHANNELS; j++) {
sample += rp[j] * *tap->t_gain[j];
}
for (int j = 0; j < TAPS + CHANNELS; j++) sample += rp[j] * *tap->t_gain[j];
wp[i] = sample * gain[i];
}
for (int i = 0; i < TAPS; i++) {
*ptap->wp[i]++ = wp[i];
}
/* Write outputs */
for (int i = 0; i < TAPS; i++) *ptap->wp[i]++ = wp[i];
*out_l++ = wp[TAPS];
*out_r++ = wp[TAPS + 1];
/* Progress read pointers */
for (int i = 0; i < TAPS; i++) {
if (ptap->wp[i] >= ptap->buffers[i] + ptap->buffer_max) {
ptap->wp[i] = ptap->buffers[i];
}
if (readp[i] >= ptap->buffers[i] + ptap->buffer_max) {
readp[i] = ptap->buffers[i];
/* Check read/write pointers */
if (check_overflow) {
for (int i = 0; i < TAPS; i++) {
if (ptap->wp[i] >= ptap->buffers_end[i]) ptap->wp[i] = ptap->buffers[i];
if (readp[i] >= ptap->buffers_end[i]) readp[i] = ptap->buffers[i];
}
}
}