74 lines
2.8 KiB
C
74 lines
2.8 KiB
C
// This file is part of the CircuitPython project: https://circuitpython.org
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//
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// SPDX-FileCopyrightText: Copyright (c) 2021 Artyom Skrobov
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//
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// SPDX-License-Identifier: MIT
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#include <math.h>
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#include <string.h>
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#include "py/enum.h"
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#include "py/mperrno.h"
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#include "py/obj.h"
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#include "py/objnamedtuple.h"
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#include "py/runtime.h"
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#include "shared-bindings/synthio/__init__.h"
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#include "shared-bindings/synthio/LFO.h"
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#include "shared-bindings/synthio/Math.h"
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#include "shared-bindings/synthio/MidiTrack.h"
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#include "shared-bindings/synthio/Note.h"
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#include "shared-bindings/synthio/Synthesizer.h"
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#include "shared-module/synthio/LFO.h"
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#define default_attack_time (MICROPY_FLOAT_CONST(0.1))
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#define default_decay_time (MICROPY_FLOAT_CONST(0.05))
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#define default_release_time (MICROPY_FLOAT_CONST(0.2))
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#define default_attack_level (MICROPY_FLOAT_CONST(1.))
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#define default_sustain_level (MICROPY_FLOAT_CONST(0.8))
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static const mp_arg_t biquad_properties[] = {
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{ MP_QSTR_a1, MP_ARG_OBJ | MP_ARG_REQUIRED, {.u_obj = MP_ROM_NONE} },
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{ MP_QSTR_a2, MP_ARG_OBJ | MP_ARG_REQUIRED, {.u_obj = MP_ROM_NONE} },
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{ MP_QSTR_b0, MP_ARG_OBJ | MP_ARG_REQUIRED, {.u_obj = MP_ROM_NONE} },
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{ MP_QSTR_b1, MP_ARG_OBJ | MP_ARG_REQUIRED, {.u_obj = MP_ROM_NONE} },
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{ MP_QSTR_b2, MP_ARG_OBJ | MP_ARG_REQUIRED, {.u_obj = MP_ROM_NONE} },
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};
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//| class Biquad:
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//| def __init__(self, b0: float, b1: float, b2: float, a1: float, a2: float) -> None:
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//| """Construct a normalized biquad filter object.
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//|
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//| This implements the "direct form 1" biquad filter, where each coefficient
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//| has been pre-divided by a0.
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//|
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//| Biquad objects are usually constructed via one of the related methods on a `Synthesizer` object
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//| rather than directly from coefficients.
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//|
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//| https://github.com/WebAudio/Audio-EQ-Cookbook/blob/main/Audio-EQ-Cookbook.txt
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//| """
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//|
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static mp_obj_t synthio_biquad_make_new(const mp_obj_type_t *type_in, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
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mp_arg_val_t args[MP_ARRAY_SIZE(biquad_properties)];
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mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(biquad_properties), biquad_properties, args);
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for (size_t i = 0; i < MP_ARRAY_SIZE(biquad_properties); i++) {
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args[i].u_obj = mp_obj_new_float(mp_arg_validate_type_float(args[i].u_obj, biquad_properties[i].qst));
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}
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MP_STATIC_ASSERT(sizeof(mp_arg_val_t) == sizeof(mp_obj_t));
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return namedtuple_make_new(type_in, MP_ARRAY_SIZE(args), 0, &args[0].u_obj);
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}
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const mp_obj_namedtuple_type_t synthio_biquad_type_obj = {
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NAMEDTUPLE_TYPE_BASE_AND_SLOTS_MAKE_NEW(MP_QSTR_Biquad, synthio_biquad_make_new),
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.n_fields = 5,
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.fields = {
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MP_QSTR_a1,
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MP_QSTR_a2,
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MP_QSTR_b0,
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MP_QSTR_b1,
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MP_QSTR_b2,
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},
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};
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