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ported bw_osc_pulse to new API

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This commit is contained in:
Stefano D'Angelo 2022-11-28 16:08:05 +01:00
parent 2b32ec75d6
commit f98f07009d
4 changed files with 219 additions and 170 deletions
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52
examples/synth/src/bw_example_synth.c
View File

@ -26,8 +26,9 @@
#endif #endif
#include <bw_math.h> #include <bw_math.h>
#include <bw_noise_gen.h>
#include <bw_phase_gen.h> #include <bw_phase_gen.h>
#include <bw_osc_pulse.h>
#include <bw_noise_gen.h>
#include <bw_svf.h> #include <bw_svf.h>
#include <bw_osc_sin.h> #include <bw_osc_sin.h>
#include <bw_vol.h> #include <bw_vol.h>
@ -57,12 +58,14 @@ enum {
p_n p_n
}; };
#define BUFFER_SIZE 128 //#define BUFFER_SIZE 128
struct _bw_example_synth { struct _bw_example_synth {
// Sub-components // Sub-components
bw_phase_gen_coeffs phase_gen_coeffs; bw_phase_gen_coeffs phase_gen_coeffs;
bw_phase_gen_state phase_gen_state; bw_phase_gen_state phase_gen_state;
bw_osc_pulse_coeffs osc_pulse_coeffs;
bw_osc_pulse_state osc_pulse_state;
bw_noise_gen_coeffs noise_gen_coeffs; bw_noise_gen_coeffs noise_gen_coeffs;
bw_svf_coeffs svf_coeffs; bw_svf_coeffs svf_coeffs;
bw_svf_state svf_state; bw_svf_state svf_state;
@ -88,7 +91,7 @@ struct _bw_example_synth {
float level; float level;
// Buffers // Buffers
float buf[BUFFER_SIZE]; //float buf[BUFFER_SIZE];
}; };
bw_example_synth bw_example_synth_new() { bw_example_synth bw_example_synth_new() {
@ -97,6 +100,7 @@ bw_example_synth bw_example_synth_new() {
return NULL; return NULL;
bw_phase_gen_init(&instance->phase_gen_coeffs); bw_phase_gen_init(&instance->phase_gen_coeffs);
bw_osc_pulse_init(&instance->osc_pulse_coeffs);
bw_noise_gen_init(&instance->noise_gen_coeffs, &instance->rand_state); bw_noise_gen_init(&instance->noise_gen_coeffs, &instance->rand_state);
bw_phase_gen_init(&instance->a440_phase_gen_coeffs); bw_phase_gen_init(&instance->a440_phase_gen_coeffs);
bw_svf_init(&instance->svf_coeffs); bw_svf_init(&instance->svf_coeffs);
@ -126,6 +130,7 @@ void bw_example_synth_free(bw_example_synth instance) {
void bw_example_synth_set_sample_rate(bw_example_synth instance, float sample_rate) { void bw_example_synth_set_sample_rate(bw_example_synth instance, float sample_rate) {
bw_phase_gen_set_sample_rate(&instance->phase_gen_coeffs, sample_rate); bw_phase_gen_set_sample_rate(&instance->phase_gen_coeffs, sample_rate);
bw_osc_pulse_set_sample_rate(&instance->osc_pulse_coeffs, sample_rate);
bw_noise_gen_set_sample_rate(&instance->noise_gen_coeffs, sample_rate); bw_noise_gen_set_sample_rate(&instance->noise_gen_coeffs, sample_rate);
bw_phase_gen_set_sample_rate(&instance->a440_phase_gen_coeffs, sample_rate); bw_phase_gen_set_sample_rate(&instance->a440_phase_gen_coeffs, sample_rate);
bw_svf_set_sample_rate(&instance->svf_coeffs, sample_rate); bw_svf_set_sample_rate(&instance->svf_coeffs, sample_rate);
@ -140,21 +145,19 @@ void bw_example_synth_set_sample_rate(bw_example_synth instance, float sample_ra
void bw_example_synth_reset(bw_example_synth instance) { void bw_example_synth_reset(bw_example_synth instance) {
bw_phase_gen_reset_coeffs(&instance->phase_gen_coeffs); bw_phase_gen_reset_coeffs(&instance->phase_gen_coeffs);
bw_phase_gen_reset_state(&instance->phase_gen_coeffs, &instance->phase_gen_state); bw_phase_gen_reset_state(&instance->phase_gen_coeffs, &instance->phase_gen_state, 0.f);
bw_osc_pulse_reset_coeffs(&instance->osc_pulse_coeffs);
bw_osc_pulse_reset_state(&instance->osc_pulse_coeffs, &instance->osc_pulse_state);
bw_phase_gen_reset_coeffs(&instance->a440_phase_gen_coeffs); bw_phase_gen_reset_coeffs(&instance->a440_phase_gen_coeffs);
bw_phase_gen_reset_state(&instance->a440_phase_gen_coeffs, &instance->a440_phase_gen_state); bw_phase_gen_reset_state(&instance->a440_phase_gen_coeffs, &instance->a440_phase_gen_state, 0.f);
bw_svf_reset_coeffs(&instance->svf_coeffs); bw_svf_reset_coeffs(&instance->svf_coeffs);
bw_svf_reset_state(&instance->svf_coeffs, &instance->svf_state); bw_svf_reset_state(&instance->svf_coeffs, &instance->svf_state);
bw_vol_reset_coeffs(&instance->vol_coeffs); bw_vol_reset_coeffs(&instance->vol_coeffs);
bw_env_follow_reset_coeffs(&instance->env_follow_coeffs); bw_env_follow_reset_coeffs(&instance->env_follow_coeffs);
bw_env_follow_reset_state(&instance->env_follow_coeffs, &instance->env_follow_state); bw_env_follow_reset_state(&instance->env_follow_coeffs, &instance->env_follow_state);
/* /*
bw_osc_pulse_reset(&instance->osc_pulse);
bw_osc_filt_reset(&instance->osc_filt); bw_osc_filt_reset(&instance->osc_filt);
bw_svf_reset(&instance->svf);
bw_env_gen_reset(&instance->env_gen); bw_env_gen_reset(&instance->env_gen);
bw_vol_reset(&instance->vol);
bw_env_follow_reset(&instance->env_follow);
*/ */
instance->note = -1; instance->note = -1;
} }
@ -168,13 +171,25 @@ void bw_example_synth_process(bw_example_synth instance, const float** x, float*
} else } else
; ;
//bw_env_gen_set_gate(&instance->env_gen, 0); //bw_env_gen_set_gate(&instance->env_gen, 0);
//bw_phase_gen_process(&instance->phase_gen_coeffs, &instance->phase_gen_state, NULL, y[0], instance->buf, n_samples);
for (int i = 0; i < n_samples; i++)
y[0][i] = 0.f;
if (instance->note != -1) if (instance->note != -1) {
bw_noise_gen_process(&instance->noise_gen_coeffs, y[0], n_samples); bw_phase_gen_update_coeffs_ctrl(&instance->phase_gen_coeffs);
bw_osc_pulse_update_coeffs_ctrl(&instance->osc_pulse_coeffs);
for (int i = 0; i < n_samples; i++) {
float phase, phase_inc;
bw_phase_gen_update_coeffs_audio(&instance->phase_gen_coeffs);
bw_phase_gen_process1(&instance->phase_gen_coeffs, &instance->phase_gen_state, &phase, &phase_inc);
bw_osc_pulse_update_coeffs_audio(&instance->osc_pulse_coeffs);
y[0][i] = bw_osc_pulse_process1_antialias(&instance->osc_pulse_coeffs, &instance->osc_pulse_state, phase, phase_inc);
}
} else {
bw_osc_pulse_reset_state(&instance->osc_pulse_coeffs, &instance->osc_pulse_state); // FIXME
bw_phase_gen_process(&instance->phase_gen_coeffs, &instance->phase_gen_state, NULL, NULL, NULL, n_samples);
for (int i = 0; i < n_samples; i++)
y[0][i] = 0.f;
}
//bw_noise_gen_process(&instance->noise_gen_coeffs, y[0], n_samples);
bw_svf_process(&instance->svf_coeffs, &instance->svf_state, y[0], y[0], NULL, NULL, n_samples); bw_svf_process(&instance->svf_coeffs, &instance->svf_state, y[0], y[0], NULL, NULL, n_samples);
@ -217,6 +232,9 @@ void bw_example_synth_set_parameter(bw_example_synth instance, int index, float
case p_portamento: case p_portamento:
bw_phase_gen_set_portamento_tau(&instance->phase_gen_coeffs, value); bw_phase_gen_set_portamento_tau(&instance->phase_gen_coeffs, value);
break; break;
case p_pulse_width:
bw_osc_pulse_set_pulse_width(&instance->osc_pulse_coeffs, value);
break;
case p_cutoff: case p_cutoff:
bw_svf_set_cutoff(&instance->svf_coeffs, 20.f + (20e3f - 20.f) * value * value * value); bw_svf_set_cutoff(&instance->svf_coeffs, 20.f + (20e3f - 20.f) * value * value * value);
break; break;
@ -224,9 +242,7 @@ void bw_example_synth_set_parameter(bw_example_synth instance, int index, float
bw_svf_set_Q(&instance->svf_coeffs, 0.5f + 9.5f * value); bw_svf_set_Q(&instance->svf_coeffs, 0.5f + 9.5f * value);
break; break;
/* /*
case p_pulse_width:
bw_osc_pulse_set_pulse_width(&instance->osc_pulse, value);
break;
case p_attack: case p_attack:
bw_env_gen_set_attack(&instance->env_gen, value); bw_env_gen_set_attack(&instance->env_gen, value);
break; break;

162
include/bw_osc_pulse.h
View File

@ -29,7 +29,7 @@
* <ul> * <ul>
* <li>Version <strong>0.2.0</strong>: * <li>Version <strong>0.2.0</strong>:
* <ul> * <ul>
* <li>Refactored API to avoid dynamic memory allocation.</li> * <li>Refactored API.</li>
* </ul> * </ul>
* </li> * </li>
* <li>Version <strong>0.1.0</strong>: * <li>Version <strong>0.1.0</strong>:
@ -49,41 +49,49 @@ extern "C" {
#endif #endif
/*! api {{{ /*! api {{{
* #### bw_osc_pulse * #### bw_osc_pulse_coeffs
* ```>>> */ * ```>>> */
typedef struct _bw_osc_pulse bw_osc_pulse; typedef struct _bw_osc_pulse_coeffs bw_osc_pulse_coeffs;
/*! <<<``` /*! <<<```
* Instance object. * Coefficients.
*
* ### bw_one_pole_state
* >>> */ * >>> */
typedef struct _bw_osc_pulse_state bw_osc_pulse_state;
/*! ... /*! <<<```
* State.
*
* #### bw_osc_pulse_init() * #### bw_osc_pulse_init()
* ```>>> */ * ```>>> */
void bw_osc_pulse_init(bw_osc_pulse *instance); static inline void bw_osc_pulse_init(bw_osc_pulse_coeffs *BW_RESTRICT coeffs);
/*! <<<``` /*! <<<```
* Initializes the `instance` object. * Initializes the `coeffs`.
* >>> */ *
/*! ...
* #### bw_osc_pulse_set_sample_rate() * #### bw_osc_pulse_set_sample_rate()
* ```>>> */ * ```>>> */
void bw_osc_pulse_set_sample_rate(bw_osc_pulse *instance, float sample_rate); static inline void bw_osc_pulse_set_sample_rate(bw_osc_pulse_coeffs *BW_RESTRICT coeffs, float sample_rate);
/*! <<<``` /*! <<<```
* Sets the `sample_rate` (Hz) value for the given `instance`. * Sets the `sample_rate` (Hz) value for the given `coeffs`.
* >>> */ *
* #### bw_osc_pulse_reset_state()
/*! ...
* #### bw_osc_pulse_reset()
* ```>>> */ * ```>>> */
void bw_osc_pulse_reset(bw_osc_pulse *instance); static inline void bw_osc_pulse_reset_state(const bw_osc_pulse_coeffs *BW_RESTRICT coeffs, bw_osc_pulse_state *BW_RESTRICT state);
/*! <<<``` /*! <<<```
* Resets the given `instance` to its initial state. * Resets the given `instance` to its initial state.
* >>> */ * >>> */
static inline void bw_osc_pulse_reset_coeffs(bw_osc_pulse_coeffs *BW_RESTRICT coeffs);
static inline void bw_osc_pulse_update_coeffs_ctrl(bw_osc_pulse_coeffs *BW_RESTRICT coeffs);
static inline void bw_osc_pulse_update_coeffs_audio(bw_osc_pulse_coeffs *BW_RESTRICT coeffs);
static inline float bw_osc_pulse_process1(const bw_osc_pulse_coeffs *BW_RESTRICT coeffs, bw_osc_pulse_state *BW_RESTRICT state, float x);
static inline float bw_osc_pulse_process1_antialias(const bw_osc_pulse_coeffs *BW_RESTRICT coeffs, bw_osc_pulse_state *BW_RESTRICT state, float x, float x_phase_inc);
/*! ... /*! ...
* #### bw_osc_pulse_process() * #### bw_osc_pulse_process()
* ```>>> */ * ```>>> */
void bw_osc_pulse_process(bw_osc_pulse *instance, const float *x, const float *x_phase_inc, float* y, int n_samples); static inline void bw_osc_pulse_process(bw_osc_pulse_coeffs *BW_RESTRICT coeffs, bw_osc_pulse_state *BW_RESTRICT state, const float *x, const float *x_phase_inc, float *y, int n_samples);
/*! <<<``` /*! <<<```
* Lets the given `instance` process `n_samples` samples from the input * Lets the given `instance` process `n_samples` samples from the input
* buffer `x` containing the normalized phase signal and fills the * buffer `x` containing the normalized phase signal and fills the
@ -96,7 +104,7 @@ void bw_osc_pulse_process(bw_osc_pulse *instance, const float *x, const float *x
/*! ... /*! ...
* #### bw_osc_pulse_set_antialiasing() * #### bw_osc_pulse_set_antialiasing()
* ```>>> */ * ```>>> */
void bw_osc_pulse_set_antialiasing(bw_osc_pulse *instance, char value); static inline void bw_osc_pulse_set_antialiasing(bw_osc_pulse_coeffs *BW_RESTRICT coeffs, char value);
/*! <<<``` /*! <<<```
* Sets whether the antialiasing is on (`value` non-`0`) or off (`0`) for the * Sets whether the antialiasing is on (`value` non-`0`) or off (`0`) for the
* given `instance`. * given `instance`.
@ -107,7 +115,7 @@ void bw_osc_pulse_set_antialiasing(bw_osc_pulse *instance, char value);
/*! ... /*! ...
* #### bw_osc_pulse_set_pulse_width() * #### bw_osc_pulse_set_pulse_width()
* ```>>> */ * ```>>> */
void bw_osc_pulse_set_pulse_width(bw_osc_pulse *instance, float value); static inline void bw_osc_pulse_set_pulse_width(bw_osc_pulse_coeffs *BW_RESTRICT coeffs, float value);
/*! <<<``` /*! <<<```
* Sets the pulse width (actually, the duty cycle) to `value` (range * Sets the pulse width (actually, the duty cycle) to `value` (range
* [`0.f`, `1.f`]) for the given `instance`. * [`0.f`, `1.f`]) for the given `instance`.
@ -115,22 +123,110 @@ void bw_osc_pulse_set_pulse_width(bw_osc_pulse *instance, float value);
* Default value: `0.5f`. * Default value: `0.5f`.
* }}} */ * }}} */
/* WARNING: the internal definition of this struct is not part of the public /*** Implementation ***/
* API. Its content may change at any time in future versions. Please, do not
* access its members directly. */ /* WARNING: This part of the file is not part of the public API. Its content may
struct _bw_osc_pulse { * change at any time in future versions. Please, do not use it directly. */
// Coefficients
float smooth_mA1; #include <bw_math.h>
#include <bw_one_pole.h>
struct _bw_osc_pulse_coeffs {
// Sub-components
bw_one_pole_coeffs smooth_coeffs;
bw_one_pole_state smooth_state;
// Parameters // Parameters
char first_run; char antialiasing;
char antialiasing; float pulse_width;
float pulse_width;
// State
float pw_z1;
}; };
struct _bw_osc_pulse_state {
// empty, but we keep for potential forward API compatibility
char unused;
};
static inline void bw_osc_pulse_init(bw_osc_pulse_coeffs *BW_RESTRICT coeffs) {
bw_one_pole_init(&coeffs->smooth_coeffs);
bw_one_pole_set_tau(&coeffs->smooth_coeffs, 0.005f);
coeffs->antialiasing = 0;
coeffs->pulse_width = 0.5f;
}
static inline void bw_osc_pulse_set_sample_rate(bw_osc_pulse_coeffs *BW_RESTRICT coeffs, float sample_rate) {
bw_one_pole_set_sample_rate(&coeffs->smooth_coeffs, sample_rate);
bw_one_pole_reset_coeffs(&coeffs->smooth_coeffs);
}
static inline void bw_osc_pulse_reset_coeffs(bw_osc_pulse_coeffs *BW_RESTRICT coeffs) {
bw_one_pole_reset_state(&coeffs->smooth_coeffs, &coeffs->smooth_state, coeffs->pulse_width);
}
static inline void bw_osc_pulse_reset_state(const bw_osc_pulse_coeffs *BW_RESTRICT coeffs, bw_osc_pulse_state *BW_RESTRICT state) {
}
static inline void bw_osc_pulse_update_coeffs_ctrl(bw_osc_pulse_coeffs *BW_RESTRICT coeffs) {
}
static inline void bw_osc_pulse_update_coeffs_audio(bw_osc_pulse_coeffs *BW_RESTRICT coeffs) {
bw_one_pole_process1(&coeffs->smooth_coeffs, &coeffs->smooth_state, coeffs->pulse_width);
}
static inline float bw_osc_pulse_process1(const bw_osc_pulse_coeffs *BW_RESTRICT coeffs, bw_osc_pulse_state *BW_RESTRICT state, float x) {
const float pw = bw_one_pole_get_y_z1(&coeffs->smooth_state);
return bw_signf(pw - x);
}
// PolyBLEP residual based on Parzen window (4th-order B-spline), one-sided (x in [0, 2])
static inline float _bw_osc_pulse_blep_diff(float x) {
return x < 1.f
? x * ((0.25f * x - 0.6666666666666666f) * x * x + 1.333333333333333f) - 1.f
: x * (x * ((0.6666666666666666f - 0.08333333333333333f * x) * x - 2.f) + 2.666666666666667f) - 1.333333333333333f;
}
static inline float bw_osc_pulse_process1_antialias(const bw_osc_pulse_coeffs *BW_RESTRICT coeffs, bw_osc_pulse_state *BW_RESTRICT state, float x, float x_phase_inc) {
const float pw = bw_one_pole_get_y_z1(&coeffs->smooth_state);
const float pw_m_phase = pw - x;
float v = bw_copysignf(1.f, pw_m_phase); // pw = phase case should be properly compensated by the AA
if (x_phase_inc != 0.f) {
const float phase_inc_2 = x_phase_inc + x_phase_inc;
const float phase_inc_rcp = bw_rcpf_2(x_phase_inc);
const float phase_2 = 0.5f * v + 0.5f - pw_m_phase;
const float s_1_m_phase = 1.f - x;
const float s_1_m_phase_2 = 1.f - phase_2;
if (s_1_m_phase < phase_inc_2)
v -= _bw_osc_pulse_blep_diff(s_1_m_phase * phase_inc_rcp);
if (s_1_m_phase_2 < phase_inc_2)
v += _bw_osc_pulse_blep_diff(s_1_m_phase_2 * phase_inc_rcp);
if (x < phase_inc_2)
v += _bw_osc_pulse_blep_diff(x * phase_inc_rcp);
if (phase_2 < phase_inc_2)
v -= _bw_osc_pulse_blep_diff(phase_2 * phase_inc_rcp);
}
return v;
}
static inline void bw_osc_pulse_process(bw_osc_pulse_coeffs *BW_RESTRICT coeffs, bw_osc_pulse_state *BW_RESTRICT state, const float *x, const float *x_phase_inc, float *y, int n_samples) {
if (coeffs->antialiasing)
for (int i = 0; i < n_samples; i++) {
bw_osc_pulse_update_coeffs_audio(coeffs);
y[i] = bw_osc_pulse_process1_antialias(coeffs, state, x[i], x_phase_inc[i]);
}
else
for (int i = 0; i < n_samples; i++) {
bw_osc_pulse_update_coeffs_audio(coeffs);
y[i] = bw_osc_pulse_process1(coeffs, state, x[i]);
}
}
static inline void bw_osc_pulse_set_antialiasing(bw_osc_pulse_coeffs *BW_RESTRICT coeffs, char value) {
coeffs->antialiasing = value;
}
static inline void bw_osc_pulse_set_pulse_width(bw_osc_pulse_coeffs *BW_RESTRICT coeffs, float value) {
coeffs->pulse_width = value;
}
#ifdef __cplusplus #ifdef __cplusplus
} }
#endif #endif

82
include/bw_phase_gen.h
View File

@ -78,7 +78,7 @@ static inline void bw_phase_gen_set_sample_rate(bw_phase_gen_coeffs *BW_RESTRICT
* *
* #### bw_phase_gen_reset() * #### bw_phase_gen_reset()
* ```>>> */ * ```>>> */
static inline void bw_phase_gen_reset_state(const bw_phase_gen_coeffs *BW_RESTRICT coeffs, bw_phase_gen_state *BW_RESTRICT state); static inline void bw_phase_gen_reset_state(const bw_phase_gen_coeffs *BW_RESTRICT coeffs, bw_phase_gen_state *BW_RESTRICT state, float phase_0);
/*! <<<``` /*! <<<```
* Resets the given `state` to the initial state using the given `coeffs`. * Resets the given `state` to the initial state using the given `coeffs`.
* >>> */ * >>> */
@ -177,8 +177,8 @@ static inline void bw_phase_gen_reset_coeffs(bw_phase_gen_coeffs *BW_RESTRICT co
bw_one_pole_reset_state(&coeffs->portamento_coeffs, &coeffs->portamento_state, coeffs->portamento_target); bw_one_pole_reset_state(&coeffs->portamento_coeffs, &coeffs->portamento_state, coeffs->portamento_target);
} }
static inline void bw_phase_gen_reset_state(const bw_phase_gen_coeffs *BW_RESTRICT coeffs, bw_phase_gen_state *BW_RESTRICT state) { static inline void bw_phase_gen_reset_state(const bw_phase_gen_coeffs *BW_RESTRICT coeffs, bw_phase_gen_state *BW_RESTRICT state, float phase_0) {
state->phase = 0.f; state->phase = phase_0;
} }
static inline void bw_phase_gen_update_coeffs_ctrl(bw_phase_gen_coeffs *BW_RESTRICT coeffs) { static inline void bw_phase_gen_update_coeffs_ctrl(bw_phase_gen_coeffs *BW_RESTRICT coeffs) {
@ -207,30 +207,60 @@ static inline void bw_phase_gen_process1_mod(const bw_phase_gen_coeffs *BW_RESTR
static inline void bw_phase_gen_process(bw_phase_gen_coeffs *BW_RESTRICT coeffs, bw_phase_gen_state *BW_RESTRICT state, const float *x_mod, float* y, float *y_phase_inc, int n_samples) { static inline void bw_phase_gen_process(bw_phase_gen_coeffs *BW_RESTRICT coeffs, bw_phase_gen_state *BW_RESTRICT state, const float *x_mod, float* y, float *y_phase_inc, int n_samples) {
bw_phase_gen_update_coeffs_ctrl(coeffs); bw_phase_gen_update_coeffs_ctrl(coeffs);
if (x_mod != NULL) { if (y != NULL) {
if (y_phase_inc != NULL) if (x_mod != NULL) {
for (int i = 0; i < n_samples; i++) { if (y_phase_inc != NULL)
bw_phase_gen_update_coeffs_audio(coeffs); for (int i = 0; i < n_samples; i++) {
bw_phase_gen_process1_mod(coeffs, state, x_mod[i], y + i, y_phase_inc + i); bw_phase_gen_update_coeffs_audio(coeffs);
} bw_phase_gen_process1_mod(coeffs, state, x_mod[i], y + i, y_phase_inc + i);
else }
for (int i = 0; i < n_samples; i++) { else
bw_phase_gen_update_coeffs_audio(coeffs); for (int i = 0; i < n_samples; i++) {
float v_phase_inc; bw_phase_gen_update_coeffs_audio(coeffs);
bw_phase_gen_process1_mod(coeffs, state, x_mod[i], y + i, &v_phase_inc); float v_phase_inc;
} bw_phase_gen_process1_mod(coeffs, state, x_mod[i], y + i, &v_phase_inc);
}
} else {
if (y_phase_inc != NULL)
for (int i = 0; i < n_samples; i++) {
bw_phase_gen_update_coeffs_audio(coeffs);
bw_phase_gen_process1(coeffs, state, y + i, y_phase_inc + i);
}
else
for (int i = 0; i < n_samples; i++) {
bw_phase_gen_update_coeffs_audio(coeffs);
float v_phase_inc;
bw_phase_gen_process1(coeffs, state, y + i, &v_phase_inc);
}
}
} else { } else {
if (y_phase_inc != NULL) if (x_mod != NULL) {
for (int i = 0; i < n_samples; i++) { if (y_phase_inc != NULL)
bw_phase_gen_update_coeffs_audio(coeffs); for (int i = 0; i < n_samples; i++) {
bw_phase_gen_process1(coeffs, state, y + i, y_phase_inc + i); bw_phase_gen_update_coeffs_audio(coeffs);
} float v;
else bw_phase_gen_process1_mod(coeffs, state, x_mod[i], &v, y_phase_inc + i);
for (int i = 0; i < n_samples; i++) { }
bw_phase_gen_update_coeffs_audio(coeffs); else
float v_phase_inc; for (int i = 0; i < n_samples; i++) {
bw_phase_gen_process1(coeffs, state, y + i, &v_phase_inc); bw_phase_gen_update_coeffs_audio(coeffs);
} float v, v_phase_inc;
bw_phase_gen_process1_mod(coeffs, state, x_mod[i], &v, &v_phase_inc);
}
} else {
if (y_phase_inc != NULL)
for (int i = 0; i < n_samples; i++) {
bw_phase_gen_update_coeffs_audio(coeffs);
float v;
bw_phase_gen_process1(coeffs, state, &v, y_phase_inc + i);
}
else
for (int i = 0; i < n_samples; i++) {
bw_phase_gen_update_coeffs_audio(coeffs);
float v, v_phase_inc;
bw_phase_gen_process1(coeffs, state, &v, &v_phase_inc);
}
}
} }
} }

93
src/bw_osc_pulse.c
View File

@ -1,93 +0,0 @@
/*
* Brickworks
*
* Copyright (C) 2022 Orastron Srl unipersonale
*
* Brickworks is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3 of the License.
*
* Brickworks is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
*
* File author: Stefano D'Angelo
*/
#include <bw_osc_pulse.h>
#include <bw_math.h>
#include <bw_inline_one_pole.h>
void bw_osc_pulse_init(bw_osc_pulse *instance) {
instance->antialiasing = 0;
instance->pulse_width = 0.5f;
}
void bw_osc_pulse_set_sample_rate(bw_osc_pulse *instance, float sample_rate) {
instance->smooth_mA1 = bw_inline_one_pole_get_mA1(sample_rate, 0.005f);
}
void bw_osc_pulse_reset(bw_osc_pulse *instance) {
instance->first_run = 1;
}
// PolyBLEP residual based on Parzen window (4th-order B-spline), one-sided (x in [0, 2])
static inline float blep_diff(float x) {
return x < 1.f
? x * ((0.25f * x - 0.6666666666666666f) * x * x + 1.333333333333333f) - 1.f
: x * (x * ((0.6666666666666666f - 0.08333333333333333f * x) * x - 2.0f) + 2.666666666666667f) - 1.333333333333333f;
}
void bw_osc_pulse_process(bw_osc_pulse *instance, const float *x, const float *x_phase_inc, float* y, int n_samples) {
if (instance->first_run) {
instance->pw_z1 = instance->pulse_width;
instance->first_run = 0;
}
if (instance->antialiasing) {
for (int i = 0; i < n_samples; i++) {
const float pw = bw_inline_one_pole(instance->pulse_width, instance->pw_z1, instance->smooth_mA1);
instance->pw_z1 = pw;
const float pw_m_phase = pw - x[i];
float v = bw_copysignf(1.f, pw_m_phase); // pw = phase case should be properly compensated by the AA
if (x_phase_inc[i] != 0.f) {
const float phase_inc_2 = x_phase_inc[i] + x_phase_inc[i];
const float phase_inc_rcp = bw_rcpf_2(x_phase_inc[i]);
const float phase_2 = 0.5f * v + 0.5f - pw_m_phase;
const float s_1_m_phase = 1.f - x[i];
const float s_1_m_phase_2 = 1.f - phase_2;
if (s_1_m_phase < phase_inc_2)
v -= blep_diff(s_1_m_phase * phase_inc_rcp);
if (s_1_m_phase_2 < phase_inc_2)
v += blep_diff(s_1_m_phase_2 * phase_inc_rcp);
if (x[i] < phase_inc_2)
v += blep_diff(x[i] * phase_inc_rcp);
if (phase_2 < phase_inc_2)
v -= blep_diff(phase_2 * phase_inc_rcp);
}
y[i] = v;
}
} else {
for (int i = 0; i < n_samples; i++) {
const float pw = bw_inline_one_pole(instance->pulse_width, instance->pw_z1, instance->smooth_mA1);
instance->pw_z1 = pw;
y[i] = bw_signf(pw - x[i]);
}
}
}
void bw_osc_pulse_set_antialiasing(bw_osc_pulse *instance, char value) {
instance->antialiasing = value;
}
void bw_osc_pulse_set_pulse_width(bw_osc_pulse *instance, float value) {
instance->pulse_width = value;
}