b011468251
In contrast to MidiTrack, this can be controlled from Python code, turning notes on/off as desired. Not tested on real HW yet, just the acceptance test based on checking which notes it thinks are held internally.
180 lines
7.8 KiB
C
180 lines
7.8 KiB
C
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2021 Artyom Skrobov
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdint.h>
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#include "shared/runtime/context_manager_helpers.h"
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#include "py/binary.h"
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#include "py/objproperty.h"
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#include "py/runtime.h"
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#include "shared-bindings/util.h"
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#include "shared-bindings/synthio/MidiTrack.h"
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#include "shared-bindings/synthio/__init__.h"
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#include "supervisor/shared/translate/translate.h"
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//| class MidiTrack:
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//| """Simple MIDI synth"""
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//|
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//| def __init__(
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//| self,
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//| buffer: ReadableBuffer,
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//| tempo: int,
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//| *,
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//| sample_rate: int = 11025,
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//| waveform: ReadableBuffer = None
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//| ) -> None:
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//| """Create a MidiTrack from the given stream of MIDI events. Only "Note On" and "Note Off" events
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//| are supported; channel numbers and key velocities are ignored. Up to two notes may be on at the
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//| same time.
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//|
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//| :param ~circuitpython_typing.ReadableBuffer buffer: Stream of MIDI events, as stored in a MIDI file track chunk
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//| :param int tempo: Tempo of the streamed events, in MIDI ticks per second
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//| :param int sample_rate: The desired playback sample rate; higher sample rate requires more memory
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//| :param ReadableBuffer waveform: A single-cycle waveform. Default is a 50% duty cycle square wave. If specified, must be a ReadableBuffer of type 'h' (signed 16 bit)
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//|
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//| Simple melody::
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//|
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//| import audioio
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//| import board
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//| import synthio
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//|
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//| dac = audioio.AudioOut(board.SPEAKER)
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//| melody = synthio.MidiTrack(b"\\0\\x90H\\0*\\x80H\\0\\6\\x90J\\0*\\x80J\\0\\6\\x90L\\0*\\x80L\\0\\6\\x90J\\0" +
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//| b"*\\x80J\\0\\6\\x90H\\0*\\x80H\\0\\6\\x90J\\0*\\x80J\\0\\6\\x90L\\0T\\x80L\\0" +
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//| b"\\x0c\\x90H\\0T\\x80H\\0\\x0c\\x90H\\0T\\x80H\\0", tempo=640)
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//| dac.play(melody)
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//| print("playing")
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//| while dac.playing:
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//| pass
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//| print("stopped")"""
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//| ...
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STATIC mp_obj_t synthio_miditrack_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
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enum { ARG_buffer, ARG_tempo, ARG_sample_rate, ARG_waveform };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_buffer, MP_ARG_OBJ | MP_ARG_REQUIRED },
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{ MP_QSTR_tempo, MP_ARG_INT | MP_ARG_REQUIRED },
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{ MP_QSTR_sample_rate, MP_ARG_INT | MP_ARG_KW_ONLY, {.u_int = 11025} },
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{ MP_QSTR_waveform, MP_ARG_OBJ | MP_ARG_KW_ONLY, {.u_obj = mp_const_none } },
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};
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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mp_buffer_info_t bufinfo;
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mp_get_buffer_raise(args[ARG_buffer].u_obj, &bufinfo, MP_BUFFER_READ);
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mp_buffer_info_t bufinfo_waveform;
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synthio_synth_parse_waveform(&bufinfo_waveform, args[ARG_waveform].u_obj);
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synthio_miditrack_obj_t *self = m_new_obj(synthio_miditrack_obj_t);
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self->base.type = &synthio_miditrack_type;
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common_hal_synthio_miditrack_construct(self,
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(uint8_t *)bufinfo.buf, bufinfo.len,
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args[ARG_tempo].u_int,
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args[ARG_sample_rate].u_int,
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bufinfo_waveform.buf,
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bufinfo_waveform.len / 2);
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return MP_OBJ_FROM_PTR(self);
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}
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//| def deinit(self) -> None:
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//| """Deinitialises the MidiTrack and releases any hardware resources for reuse."""
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//| ...
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STATIC mp_obj_t synthio_miditrack_deinit(mp_obj_t self_in) {
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synthio_miditrack_obj_t *self = MP_OBJ_TO_PTR(self_in);
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common_hal_synthio_miditrack_deinit(self);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(synthio_miditrack_deinit_obj, synthio_miditrack_deinit);
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STATIC void check_for_deinit(synthio_miditrack_obj_t *self) {
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if (common_hal_synthio_miditrack_deinited(self)) {
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raise_deinited_error();
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}
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}
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//| def __enter__(self) -> MidiTrack:
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//| """No-op used by Context Managers."""
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//| ...
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// Provided by context manager helper.
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//| def __exit__(self) -> None:
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//| """Automatically deinitializes the hardware when exiting a context. See
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//| :ref:`lifetime-and-contextmanagers` for more info."""
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//| ...
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STATIC mp_obj_t synthio_miditrack_obj___exit__(size_t n_args, const mp_obj_t *args) {
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(void)n_args;
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common_hal_synthio_miditrack_deinit(args[0]);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(synthio_miditrack___exit___obj, 4, 4, synthio_miditrack_obj___exit__);
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//| sample_rate: Optional[int]
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//| """32 bit value that tells how quickly samples are played in Hertz (cycles per second)."""
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//|
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STATIC mp_obj_t synthio_miditrack_obj_get_sample_rate(mp_obj_t self_in) {
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synthio_miditrack_obj_t *self = MP_OBJ_TO_PTR(self_in);
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check_for_deinit(self);
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return MP_OBJ_NEW_SMALL_INT(common_hal_synthio_miditrack_get_sample_rate(self));
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}
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MP_DEFINE_CONST_FUN_OBJ_1(synthio_miditrack_get_sample_rate_obj, synthio_miditrack_obj_get_sample_rate);
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MP_PROPERTY_GETTER(synthio_miditrack_sample_rate_obj,
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(mp_obj_t)&synthio_miditrack_get_sample_rate_obj);
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STATIC const mp_rom_map_elem_t synthio_miditrack_locals_dict_table[] = {
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// Methods
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{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&synthio_miditrack_deinit_obj) },
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{ MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&default___enter___obj) },
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{ MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&synthio_miditrack___exit___obj) },
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// Properties
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{ MP_ROM_QSTR(MP_QSTR_sample_rate), MP_ROM_PTR(&synthio_miditrack_sample_rate_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(synthio_miditrack_locals_dict, synthio_miditrack_locals_dict_table);
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STATIC const audiosample_p_t synthio_miditrack_proto = {
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MP_PROTO_IMPLEMENT(MP_QSTR_protocol_audiosample)
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.sample_rate = (audiosample_sample_rate_fun)common_hal_synthio_miditrack_get_sample_rate,
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.bits_per_sample = (audiosample_bits_per_sample_fun)common_hal_synthio_miditrack_get_bits_per_sample,
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.channel_count = (audiosample_channel_count_fun)common_hal_synthio_miditrack_get_channel_count,
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.reset_buffer = (audiosample_reset_buffer_fun)synthio_miditrack_reset_buffer,
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.get_buffer = (audiosample_get_buffer_fun)synthio_miditrack_get_buffer,
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.get_buffer_structure = (audiosample_get_buffer_structure_fun)synthio_miditrack_get_buffer_structure,
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};
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const mp_obj_type_t synthio_miditrack_type = {
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{ &mp_type_type },
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.name = MP_QSTR_MidiTrack,
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.flags = MP_TYPE_FLAG_EXTENDED,
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.make_new = synthio_miditrack_make_new,
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.locals_dict = (mp_obj_dict_t *)&synthio_miditrack_locals_dict,
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MP_TYPE_EXTENDED_FIELDS(
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.protocol = &synthio_miditrack_proto,
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),
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};
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