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fix rounding bug and extra debug checks for bw_phase_gen

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This commit is contained in:
Stefano D'Angelo 2024-06-18 15:22:13 +02:00
parent 5bd685ed7b
commit 861cdc427e
1 changed files with 17 additions and 5 deletions
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22
include/bw_phase_gen.h
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@ -31,6 +31,11 @@
* <ul>
* <li>Version <strong>1.1.1</strong>:
* <ul>
* <li>Fixed rounding bug when frequency is tiny (again).</li>
* <li>Added debugging check in <code>bw_phase_reset_state()</code> to
* ensure that <code>phase_0</code> is in [<code>0.f</code>,
* <code>1.f</code>) and indicated such range in the
* documentation.</li>
* <li>Added debugging check in
* <code>bw_phase_gen_process_multi()</code> to ensure that buffers
* used for both input and output appear at the same channel
@ -167,6 +172,8 @@ static inline void bw_phase_gen_reset_state(
* The corresponding initial output and phase increment values are put into
* `y_0` and `y_inc_0` respectively.
*
* `phase_0` must be in [`0.f`, `1.f`).
*
* #### bw_phase_gen_reset_state_multi()
* ```>>> */
static inline void bw_phase_gen_reset_state_multi(
@ -184,6 +191,8 @@ static inline void bw_phase_gen_reset_state_multi(
* The corresponding initial output and phase increment values are put into
* the `y_0` and `y_inc_0` arrays, respectively, if they are not `BW_NULL`.
*
* Values in `phase_0` must be in [`0.f`, `1.f`).
*
* #### bw_phase_gen_update_coeffs_ctrl()
* ```>>> */
static inline void bw_phase_gen_update_coeffs_ctrl(
@ -406,7 +415,8 @@ static inline void bw_phase_gen_set_sample_rate(
}
static inline void bw_phase_gen_do_update_coeffs_ctrl(
bw_phase_gen_coeffs * BW_RESTRICT coeffs, char force) {
bw_phase_gen_coeffs * BW_RESTRICT coeffs,
char force) {
bw_one_pole_update_coeffs_ctrl(&coeffs->portamento_coeffs);
if (force || coeffs->frequency != coeffs->frequency_prev) {
coeffs->portamento_target = coeffs->T * coeffs->frequency;
@ -443,6 +453,7 @@ static inline void bw_phase_gen_reset_state(
BW_ASSERT_DEEP(coeffs->state >= bw_phase_gen_coeffs_state_reset_coeffs);
BW_ASSERT(state != BW_NULL);
BW_ASSERT(bw_is_finite(phase_0));
BW_ASSERT(phase_0 >= 0.f && phase_0 < 1.f);
BW_ASSERT(y_0 != BW_NULL);
BW_ASSERT(y_inc_0 != BW_NULL);
BW_ASSERT(y_0 != y_inc_0);
@ -537,8 +548,9 @@ static inline void bw_phase_gen_update_coeffs_audio(
static inline float bw_phase_gen_update_phase(
bw_phase_gen_state * BW_RESTRICT state,
float inc) {
state->phase += inc + 1.f; // + 1.f solves rounding issues with tiny negative frequencies
float * inc) {
*inc = bw_absf(*inc) < 1e-7f ? 0.f : *inc; // suppress troublesome tiny frequencies (sub nHz range usually)
state->phase += *inc;
state->phase -= bw_floorf(state->phase);
return state->phase;
}
@ -558,7 +570,7 @@ static inline void bw_phase_gen_process1(
BW_ASSERT(y != y_inc);
*y_inc = bw_one_pole_get_y_z1(&coeffs->portamento_state);
*y = bw_phase_gen_update_phase(state, *y_inc);
*y = bw_phase_gen_update_phase(state, y_inc);
BW_ASSERT_DEEP(bw_phase_gen_coeffs_is_valid(coeffs));
BW_ASSERT_DEEP(coeffs->state >= bw_phase_gen_coeffs_state_reset_coeffs);
@ -585,7 +597,7 @@ static inline void bw_phase_gen_process1_mod(
BW_ASSERT(y != y_inc);
*y_inc = bw_one_pole_get_y_z1(&coeffs->portamento_state) * bw_pow2f(x_mod);
*y = bw_phase_gen_update_phase(state, *y_inc);
*y = bw_phase_gen_update_phase(state, y_inc);
BW_ASSERT_DEEP(bw_phase_gen_coeffs_is_valid(coeffs));
BW_ASSERT_DEEP(coeffs->state >= bw_phase_gen_coeffs_state_reset_coeffs);