8000 Fix sample decimation bug on `audiodelays.Echo` when `freq_shift=True` by relic-se · Pull Request #10017 · adafruit/circuitpython · GitHub
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Fix sample decimation bug on audiodelays.Echo when freq_shift=True #10017

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Merged
merged 1 commit into from
Feb 1, 2025
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Fix sample decimation bug on audiodelays.Echo when freq_shift=True #10017

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18 changes: 9 additions & 9 deletions shared-module/audiodelays/Echo.c
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Original file line number Diff line number Diff line change
Expand Up @@ -351,8 +351,8 @@ audioio_get_buffer_result_t audiodelays_echo_get_buffer(audiodelays_echo_obj_t *
echo = echo_buffer[echo_buffer_pos >> 8];
next_buffer_pos = echo_buffer_pos + self->echo_buffer_rate;

word = (int16_t)(echo * decay);
for (uint32_t j = echo_buffer_pos >> 8; j < next_buffer_pos >> 8; j++) {
word = (int16_t)(echo_buffer[j % echo_buf_len] * decay);
echo_buffer[j % echo_buf_len] = word;
}
} else {
Expand Down Expand Up @@ -421,33 +421,33 @@ audioio_get_buffer_result_t audiodelays_echo_get_buffer(audiodelays_echo_obj_t *
if (self->freq_shift) {
echo = echo_buffer[echo_buffer_pos >> 8];
next_buffer_pos = echo_buffer_pos + self->echo_buffer_rate;
word = (int32_t)(echo * decay + sample_word);
} else {
echo = echo_buffer[self->echo_buffer_read_pos++];
word = (int32_t)(echo * decay + sample_word);
}

if (MP_LIKELY(self->bits_per_sample == 16)) {
word = synthio_mix_down_sample(word, SYNTHIO_MIX_DOWN_SCALE(2));
if (self->freq_shift) {
for (uint32_t j = echo_buffer_pos >> 8; j < next_buffer_pos >> 8; j++) {
word = (int32_t)(echo_buffer[j % echo_buf_len] * decay + sample_word);
word = synthio_mix_down_sample(word, SYNTHIO_MIX_DOWN_SCALE(2));
echo_buffer[j % echo_buf_len] = (int16_t)word;
}
} else {
word = synthio_mix_down_sample(word, SYNTHIO_MIX_DOWN_SCALE(2));
echo_buffer[self->echo_buffer_write_pos++] = (int16_t)word;
}
} else {
// Do not have mix_down for 8 bit so just hard cap samples into 1 byte
if (word > 127) {
word = 127;
} else if (word < -128) {
word = -128;
}
if (self->freq_shift) {
for (uint32_t j = echo_buffer_pos >> 8; j < next_buffer_pos >> 8; j++) {
word = (int32_t)(echo_buffer[j % echo_buf_len] * decay + sample_word);
// Do not have mix_down for 8 bit so just hard cap samples into 1 byte
word = MIN(MAX(word, -128), 127);
echo_buffer[j % echo_buf_len] = (int8_t)word;
}
} else {
// Do not have mix_down for 8 bit so just hard cap samples into 1 byte
word = MIN(MAX(word, -128), 127);
echo_buffer[self->echo_buffer_write_pos++] = (int8_t)word;
}
}
Expand Down
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