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[synthio] add a simple MidiTrack implementation

This commit is contained in:
Artyom Skrobov 2021-03-19 18:22:00 -04:00
parent 155b61f027
commit 8056af8648
18 changed files with 733 additions and 24 deletions
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17
locale/circuitpython.pot
View File

@ -874,6 +874,11 @@ msgstr ""
msgid "EXTINT channel already in use"
msgstr ""
#: shared-module/synthio/MidiTrack.c
#, c-format
msgid "Error in MIDI stream at position %d"
msgstr ""
#: extmod/modure.c
msgid "Error in regex"
msgstr ""
@ -1197,6 +1202,10 @@ msgstr ""
msgid "Invalid DAC pin supplied"
msgstr ""
#: shared-bindings/synthio/__init__.c
msgid "Invalid MIDI file"
msgstr ""
#: ports/atmel-samd/common-hal/pwmio/PWMOut.c
#: ports/cxd56/common-hal/pwmio/PWMOut.c ports/nrf/common-hal/pwmio/PWMOut.c
#: ports/raspberrypi/common-hal/pwmio/PWMOut.c shared-bindings/pwmio/PWMOut.c
@ -1877,7 +1886,7 @@ msgstr ""
msgid "Read-only filesystem"
msgstr ""
#: shared-module/bitmaptools/__init__.c shared-module/displayio/Bitmap.c
#: shared-module/displayio/Bitmap.c
msgid "Read-only object"
msgstr ""
@ -2488,10 +2497,6 @@ msgstr ""
msgid "buffer is smaller than requested size"
msgstr ""
#: shared-bindings/audiocore/RawSample.c
msgid "buffer must be a bytes-like object"
msgstr ""
#: extmod/ulab/code/ulab_create.c
msgid "buffer size must be a multiple of element size"
msgstr ""
@ -2933,7 +2938,7 @@ msgid "f-string: single '}' is not allowed"
msgstr ""
#: shared-bindings/audiocore/WaveFile.c shared-bindings/audiomp3/MP3Decoder.c
#: shared-bindings/displayio/OnDiskBitmap.c
#: shared-bindings/displayio/OnDiskBitmap.c shared-bindings/synthio/__init__.c
msgid "file must be a file opened in byte mode"
msgstr ""

1
ports/atmel-samd/mpconfigport.mk
View File

@ -39,6 +39,7 @@ CIRCUITPY_BUILTINS_POW3 ?= 0
CIRCUITPY_COMPUTED_GOTO_SAVE_SPACE ?= 1
CIRCUITPY_FREQUENCYIO ?= 0
CIRCUITPY_JSON ?= 0
CIRCUITPY_SYNTHIO ?= 0
CIRCUITPY_TOUCHIO_USE_NATIVE ?= 1
# No room for HCI _bleio on SAMD21.

5
py/circuitpy_defns.mk
View File

@ -280,6 +280,9 @@ endif
ifeq ($(CIRCUITPY_SUPERVISOR),1)
SRC_PATTERNS += supervisor/%
endif
ifeq ($(CIRCUITPY_SYNTHIO),1)
SRC_PATTERNS += synthio/%
endif
ifeq ($(CIRCUITPY_TERMINALIO),1)
SRC_PATTERNS += terminalio/% fontio/%
endif
@ -523,6 +526,8 @@ SRC_SHARED_MODULE_ALL = \
socket/__init__.c \
storage/__init__.c \
struct/__init__.c \
synthio/MidiTrack.c \
synthio/__init__.c \
terminalio/Terminal.c \
terminalio/__init__.c \
time/__init__.c \

8
py/circuitpy_mpconfig.h
View File

@ -728,6 +728,13 @@ extern const struct _mp_obj_module_t supervisor_module;
#define SUPERVISOR_MODULE
#endif
#if CIRCUITPY_SYNTHIO
#define SYNTHIO_MODULE { MP_OBJ_NEW_QSTR(MP_QSTR_synthio), (mp_obj_t)&synthio_module },
extern const struct _mp_obj_module_t synthio_module;
#else
#define SYNTHIO_MODULE
#endif
#if CIRCUITPY_TIME
extern const struct _mp_obj_module_t time_module;
#define TIME_MODULE { MP_OBJ_NEW_QSTR(MP_QSTR_time), (mp_obj_t)&time_module },
@ -897,6 +904,7 @@ extern const struct _mp_obj_module_t msgpack_module;
STORAGE_MODULE \
STRUCT_MODULE \
SUPERVISOR_MODULE \
SYNTHIO_MODULE \
TOUCHIO_MODULE \
UHEAP_MODULE \
USB_CDC_MODULE \

3
py/circuitpy_mpconfig.mk
View File

@ -305,6 +305,9 @@ CFLAGS += -DCIRCUITPY_STRUCT=$(CIRCUITPY_STRUCT)
CIRCUITPY_SUPERVISOR ?= 1
CFLAGS += -DCIRCUITPY_SUPERVISOR=$(CIRCUITPY_SUPERVISOR)
CIRCUITPY_SYNTHIO ?= $(CIRCUITPY_AUDIOCORE)
CFLAGS += -DCIRCUITPY_SYNTHIO=$(CIRCUITPY_SYNTHIO)
CIRCUITPY_TERMINALIO ?= $(CIRCUITPY_DISPLAYIO)
CFLAGS += -DCIRCUITPY_TERMINALIO=$(CIRCUITPY_TERMINALIO)

3
shared-bindings/_typing/__init__.pyi
View File

@ -38,7 +38,7 @@ WriteableBuffer = Union[
"""
AudioSample = Union[
audiocore.WaveFile, audiocore.RawSample, audiomixer.Mixer, audiomp3.MP3Decoder
audiocore.WaveFile, audiocore.RawSample, audiomixer.Mixer, audiomp3.MP3Decoder, synthio.MidiTrack
]
"""Classes that implement the audiosample protocol
@ -46,6 +46,7 @@ AudioSample = Union[
- `audiocore.RawSample`
- `audiomixer.Mixer`
- `audiomp3.MP3Decoder`
- `synthio.MidiTrack`
You can play these back with `audioio.AudioOut`, `audiobusio.I2SOut` or `audiopwmio.PWMAudioOut`.
"""

8
shared-bindings/audiocore/RawSample.c
View File

@ -30,7 +30,6 @@
#include "py/binary.h"
#include "py/objproperty.h"
#include "py/runtime.h"
#include "shared-bindings/microcontroller/Pin.h"
#include "shared-bindings/util.h"
#include "shared-bindings/audiocore/RawSample.h"
#include "supervisor/shared/translate.h"
@ -83,7 +82,7 @@ STATIC mp_obj_t audioio_rawsample_make_new(const mp_obj_type_t *type, size_t n_a
audioio_rawsample_obj_t *self = m_new_obj(audioio_rawsample_obj_t);
self->base.type = &audioio_rawsample_type;
mp_buffer_info_t bufinfo;
if (mp_get_buffer(args[ARG_buffer].u_obj, &bufinfo, MP_BUFFER_READ)) {
mp_get_buffer_raise(args[ARG_buffer].u_obj, &bufinfo, MP_BUFFER_READ);
uint8_t bytes_per_sample = 1;
bool signed_samples = bufinfo.typecode == 'b' || bufinfo.typecode == 'h';
if (bufinfo.typecode == 'h' || bufinfo.typecode == 'H') {
@ -94,15 +93,12 @@ STATIC mp_obj_t audioio_rawsample_make_new(const mp_obj_type_t *type, size_t n_a
common_hal_audioio_rawsample_construct(self, ((uint8_t *)bufinfo.buf), bufinfo.len,
bytes_per_sample, signed_samples, args[ARG_channel_count].u_int,
args[ARG_sample_rate].u_int);
} else {
mp_raise_TypeError(translate("buffer must be a bytes-like object"));
}
return MP_OBJ_FROM_PTR(self);
}
//| def deinit(self) -> None:
//| """Deinitialises the AudioOut and releases any hardware resources for reuse."""
//| """Deinitialises the RawSample and releases any hardware resources for reuse."""
//| ...
//|
STATIC mp_obj_t audioio_rawsample_deinit(mp_obj_t self_in) {

1
shared-bindings/audiocore/RawSample.h
View File

@ -27,7 +27,6 @@
#ifndef MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOIO_RAWSAMPLE_H
#define MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOIO_RAWSAMPLE_H
#include "common-hal/microcontroller/Pin.h"
#include "shared-module/audiocore/RawSample.h"
extern const mp_obj_type_t audioio_rawsample_type;

2
shared-bindings/audiocore/WaveFile.c
View File

@ -44,7 +44,7 @@
//| """Load a .wav file for playback with `audioio.AudioOut` or `audiobusio.I2SOut`.
//|
//| :param typing.BinaryIO file: Already opened wave file
//| :param ~_typing.WriteableBuffer buffer: Optional pre-allocated buffer, that will be split in half and used for double-buffering of the data. If not provided, two 512 byte buffers are allocated internally.
//| :param ~_typing.WriteableBuffer buffer: Optional pre-allocated buffer, that will be split in half and used for double-buffering of the data. If not provided, two 256 byte buffers are allocated internally.
//|
//|
//| Playing a wave file from flash::

169
shared-bindings/synthio/MidiTrack.c Normal file
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@ -0,0 +1,169 @@
/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2021 Artyom Skrobov
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdint.h>
#include "lib/utils/context_manager_helpers.h"
#include "py/binary.h"
#include "py/objproperty.h"
#include "py/runtime.h"
#include "shared-bindings/util.h"
#include "shared-bindings/synthio/MidiTrack.h"
#include "supervisor/shared/translate.h"
//| class MidiTrack:
//| """Simple square-wave MIDI synth"""
//|
//| def __init__(self, buffer: ReadableBuffer, tempo: int, *, sample_rate: int = 11025) -> None:
//| """Create a MidiTrack from the given stream of MIDI events. Only "Note On" and "Note Off" events
//| are supported; channel numbers and key velocities are ignored. Up to two notes may be on at the
//| same time.
//|
//| :param ~_typing.ReadableBuffer buffer: Stream of MIDI events, as stored in a MIDI file track chunk
//| :param int tempo: Tempo of the streamed events, in MIDI ticks per second
//| :param int sample_rate: The desired playback sample rate; higher sample rate requires more memory
//|
//| Simple melody::
//|
//| import audioio
//| import board
//| import synthio
//|
//| dac = audioio.AudioOut(board.SPEAKER)
//| melody = synthio.MidiTrack(b"\\0\\x90H\\0*\\x80H\\0\\6\\x90J\\0*\\x80J\\0\\6\\x90L\\0*\\x80L\\0\\6\\x90J\\0" +
//| b"*\\x80J\\0\\6\\x90H\\0*\\x80H\\0\\6\\x90J\\0*\\x80J\\0\\6\\x90L\\0T\\x80L\\0" +
//| b"\\x0c\\x90H\\0T\\x80H\\0\\x0c\\x90H\\0T\\x80H\\0", tempo=640)
//| dac.play(melody)
//| print("playing")
//| while dac.playing:
//| pass
//| print("stopped")"""
//| ...
//|
STATIC mp_obj_t synthio_miditrack_make_new(const mp_obj_type_t *type, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
enum { ARG_buffer, ARG_tempo, ARG_sample_rate };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_buffer, MP_ARG_OBJ | MP_ARG_REQUIRED },
{ MP_QSTR_tempo, MP_ARG_INT | MP_ARG_REQUIRED },
{ MP_QSTR_sample_rate, MP_ARG_INT | MP_ARG_KW_ONLY, {.u_int = 11025} },
};
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(args[ARG_buffer].u_obj, &bufinfo, MP_BUFFER_READ);
synthio_miditrack_obj_t *self = m_new_obj(synthio_miditrack_obj_t);
self->base.type = &synthio_miditrack_type;
common_hal_synthio_miditrack_construct(self,
(uint8_t *)bufinfo.buf, bufinfo.len,
args[ARG_tempo].u_int,
args[ARG_sample_rate].u_int);
return MP_OBJ_FROM_PTR(self);
}
//| def deinit(self) -> None:
//| """Deinitialises the MidiTrack and releases any hardware resources for reuse."""
//| ...
//|
STATIC mp_obj_t synthio_miditrack_deinit(mp_obj_t self_in) {
synthio_miditrack_obj_t *self = MP_OBJ_TO_PTR(self_in);
common_hal_synthio_miditrack_deinit(self);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(synthio_miditrack_deinit_obj, synthio_miditrack_deinit);
STATIC void check_for_deinit(synthio_miditrack_obj_t *self) {
if (common_hal_synthio_miditrack_deinited(self)) {
raise_deinited_error();
}
}
//| def __enter__(self) -> MidiTrack:
//| """No-op used by Context Managers."""
//| ...
//|
// Provided by context manager helper.
//| def __exit__(self) -> None:
//| """Automatically deinitializes the hardware when exiting a context. See
//| :ref:`lifetime-and-contextmanagers` for more info."""
//| ...
//|
STATIC mp_obj_t synthio_miditrack_obj___exit__(size_t n_args, const mp_obj_t *args) {
(void)n_args;
common_hal_synthio_miditrack_deinit(args[0]);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(synthio_miditrack___exit___obj, 4, 4, synthio_miditrack_obj___exit__);
//| sample_rate: Optional[int]
//| """32 bit value that tells how quickly samples are played in Hertz (cycles per second)."""
//|
STATIC mp_obj_t synthio_miditrack_obj_get_sample_rate(mp_obj_t self_in) {
synthio_miditrack_obj_t *self = MP_OBJ_TO_PTR(self_in);
check_for_deinit(self);
return MP_OBJ_NEW_SMALL_INT(common_hal_synthio_miditrack_get_sample_rate(self));
}
MP_DEFINE_CONST_FUN_OBJ_1(synthio_miditrack_get_sample_rate_obj, synthio_miditrack_obj_get_sample_rate);
const mp_obj_property_t synthio_miditrack_sample_rate_obj = {
.base.type = &mp_type_property,
.proxy = {(mp_obj_t)&synthio_miditrack_get_sample_rate_obj,
(mp_obj_t)&mp_const_none_obj,
(mp_obj_t)&mp_const_none_obj},
};
STATIC const mp_rom_map_elem_t synthio_miditrack_locals_dict_table[] = {
// Methods
{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&synthio_miditrack_deinit_obj) },
{ MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&default___enter___obj) },
{ MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&synthio_miditrack___exit___obj) },
// Properties
{ MP_ROM_QSTR(MP_QSTR_sample_rate), MP_ROM_PTR(&synthio_miditrack_sample_rate_obj) },
};
STATIC MP_DEFINE_CONST_DICT(synthio_miditrack_locals_dict, synthio_miditrack_locals_dict_table);
STATIC const audiosample_p_t synthio_miditrack_proto = {
MP_PROTO_IMPLEMENT(MP_QSTR_protocol_audiosample)
.sample_rate = (audiosample_sample_rate_fun)common_hal_synthio_miditrack_get_sample_rate,
.bits_per_sample = (audiosample_bits_per_sample_fun)common_hal_synthio_miditrack_get_bits_per_sample,
.channel_count = (audiosample_channel_count_fun)common_hal_synthio_miditrack_get_channel_count,
.reset_buffer = (audiosample_reset_buffer_fun)synthio_miditrack_reset_buffer,
.get_buffer = (audiosample_get_buffer_fun)synthio_miditrack_get_buffer,
.get_buffer_structure = (audiosample_get_buffer_structure_fun)synthio_miditrack_get_buffer_structure,
};
const mp_obj_type_t synthio_miditrack_type = {
{ &mp_type_type },
.name = MP_QSTR_MidiTrack,
.make_new = synthio_miditrack_make_new,
.locals_dict = (mp_obj_dict_t *)&synthio_miditrack_locals_dict,
.protocol = &synthio_miditrack_proto,
};

43
shared-bindings/synthio/MidiTrack.h Normal file
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@ -0,0 +1,43 @@
/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2021 Artyom Skrobov
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef MICROPY_INCLUDED_SHARED_BINDINGS_SYNTHIO_MIDITRACK_H
#define MICROPY_INCLUDED_SHARED_BINDINGS_SYNTHIO_MIDITRACK_H
#include "shared-module/synthio/MidiTrack.h"
extern const mp_obj_type_t synthio_miditrack_type;
void common_hal_synthio_miditrack_construct(synthio_miditrack_obj_t *self,
const uint8_t *buffer, uint32_t len, uint32_t tempo, uint32_t sample_rate);
void common_hal_synthio_miditrack_deinit(synthio_miditrack_obj_t *self);
bool common_hal_synthio_miditrack_deinited(synthio_miditrack_obj_t *self);
uint32_t common_hal_synthio_miditrack_get_sample_rate(synthio_miditrack_obj_t *self);
uint8_t common_hal_synthio_miditrack_get_bits_per_sample(synthio_miditrack_obj_t *self);
uint8_t common_hal_synthio_miditrack_get_channel_count(synthio_miditrack_obj_t *self);
#endif // MICROPY_INCLUDED_SHARED_BINDINGS_SYNTHIO_MIDITRACK_H

136
shared-bindings/synthio/__init__.c Normal file
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@ -0,0 +1,136 @@
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2021 Artyom Skrobov
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <string.h>
#include "py/mperrno.h"
#include "py/obj.h"
#include "py/runtime.h"
#include "extmod/vfs_fat.h"
#include "shared-bindings/synthio/__init__.h"
#include "shared-bindings/synthio/MidiTrack.h"
//| """Support for MIDI synthesis"""
//|
//| def from_file(file: typing.BinaryIO, *, sample_rate: int = 11025) -> MidiTrack:
//| """Create an AudioSample from an already opened MIDI file.
//| Currently, only single-track MIDI (type 0) is supported.
//|
//| :param typing.BinaryIO file: Already opened MIDI file
//| :param int sample_rate: The desired playback sample rate; higher sample rate requires more memory
//|
//|
//| Playing a MIDI file from flash::
//|
//| import audioio
//| import board
//| import synthio
//|
//| data = open("single-track.midi", "rb")
//| midi = synthio.from_file(data)
//| a = audioio.AudioOut(board.A0)
//|
//| print("playing")
//| a.play(midi)
//| while a.playing:
//| pass
//| print("stopped")"""
//| ...
//|
STATIC mp_obj_t synthio_from_file(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
enum { ARG_file, ARG_sample_rate };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_file, MP_ARG_OBJ | MP_ARG_REQUIRED },
{ MP_QSTR_sample_rate, MP_ARG_INT | MP_ARG_KW_ONLY, {.u_int = 11025} },
};
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
if (!MP_OBJ_IS_TYPE(args[ARG_file].u_obj, &mp_type_fileio)) {
mp_raise_TypeError(translate("file must be a file opened in byte mode"));
}
pyb_file_obj_t *file = MP_OBJ_TO_PTR(args[ARG_file].u_obj);
uint8_t chunk_header[14];
f_rewind(&file->fp);
UINT bytes_read;
if (f_read(&file->fp, chunk_header, sizeof(chunk_header), &bytes_read) != FR_OK) {
mp_raise_OSError(MP_EIO);
}
if (bytes_read != sizeof(chunk_header) ||
memcmp(chunk_header, "MThd\0\0\0\6\0\0\0\1", 12)) {
mp_raise_ValueError(translate("Invalid MIDI file"));
// TODO: for a multi-track MIDI (type 1), return an AudioMixer
}
uint16_t tempo;
if (chunk_header[12] & 0x80) {
tempo = -(int8_t)chunk_header[12] * chunk_header[13];
} else {
tempo = 2 * ((chunk_header[12] << 8) | chunk_header[13]);
}
if (f_read(&file->fp, chunk_header, 8, &bytes_read) != FR_OK) {
mp_raise_OSError(MP_EIO);
}
if (bytes_read != 8 || memcmp(chunk_header, "MTrk", 4)) {
mp_raise_ValueError(translate("Invalid MIDI file"));
}
uint32_t track_size = (chunk_header[4] << 24) |
(chunk_header[5] << 16) | (chunk_header[6] << 8) | chunk_header[7];
uint8_t *buffer = m_malloc(track_size, false);
if (f_read(&file->fp, buffer, track_size, &bytes_read) != FR_OK) {
mp_raise_OSError(MP_EIO);
}
if (bytes_read != track_size) {
mp_raise_ValueError(translate("Invalid MIDI file"));
}
synthio_miditrack_obj_t *result = m_new_obj(synthio_miditrack_obj_t);
result->base.type = &synthio_miditrack_type;
common_hal_synthio_miditrack_construct(result, buffer, track_size,
tempo, args[ARG_sample_rate].u_int);
m_free(buffer);
return MP_OBJ_FROM_PTR(result);
}
MP_DEFINE_CONST_FUN_OBJ_KW(synthio_from_file_obj, 1, synthio_from_file);
STATIC const mp_rom_map_elem_t synthio_module_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_synthio) },
{ MP_ROM_QSTR(MP_QSTR_MidiTrack), MP_ROM_PTR(&synthio_miditrack_type) },
{ MP_ROM_QSTR(MP_QSTR_from_file), MP_ROM_PTR(&synthio_from_file_obj) },
};
STATIC MP_DEFINE_CONST_DICT(synthio_module_globals, synthio_module_globals_table);
const mp_obj_module_t synthio_module = {
.base = { &mp_type_module },
.globals = (mp_obj_dict_t *)&synthio_module_globals,
};

34
shared-bindings/synthio/__init__.h Normal file
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@ -0,0 +1,34 @@
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2021 Artyom Skrobov
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef MICROPY_INCLUDED_SHARED_BINDINGS_SYNTHIO___INIT___H
#define MICROPY_INCLUDED_SHARED_BINDINGS_SYNTHIO___INIT___H
#include "py/obj.h"
// Nothing now.
#endif // MICROPY_INCLUDED_SHARED_BINDINGS_SYNTHIO___INIT___H

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2021 Artyom Skrobov
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "py/runtime.h"
#include "shared-bindings/synthio/MidiTrack.h"
#define LOUDNESS 0x4000 // 0.5
#define BITS_PER_SAMPLE 16
#define BYTES_PER_SAMPLE (BITS_PER_SAMPLE / 8)
#define SILENCE 0x80
STATIC uint8_t parse_note(const uint8_t *buffer, uint32_t len, uint32_t *pos) {
if (*pos + 1 >= len) {
mp_raise_ValueError_varg(translate("Error in MIDI stream at position %d"), *pos);
}
uint8_t note = buffer[(*pos)++];
if (note > 127 || buffer[(*pos)++] > 127) {
mp_raise_ValueError_varg(translate("Error in MIDI stream at position %d"), *pos);
}
return note;
}
STATIC void terminate_span(synthio_miditrack_obj_t *self, uint16_t *dur, uint16_t *max_dur) {
if (*dur) {
self->track[self->total_spans - 1].dur = *dur;
if (*dur > *max_dur) {
*max_dur = *dur;
}
*dur = 0;
} else {
self->total_spans--;
}
}
STATIC void add_span(synthio_miditrack_obj_t *self, uint8_t note1, uint8_t note2) {
synthio_midi_span_t span = { 0, {note1, note2} };
self->track = m_realloc(self->track,
(self->total_spans + 1) * sizeof(synthio_midi_span_t));
self->track[self->total_spans++] = span;
}
void common_hal_synthio_miditrack_construct(synthio_miditrack_obj_t *self,
const uint8_t *buffer, uint32_t len, uint32_t tempo, uint32_t sample_rate) {
synthio_midi_span_t initial = { 0, {SILENCE, SILENCE} };
self->sample_rate = sample_rate;
self->track = m_malloc(sizeof(synthio_midi_span_t), false);
self->next_span = 0;
self->total_spans = 1;
*self->track = initial;
uint16_t dur = 0, max_dur = 0;
uint32_t pos = 0;
while (pos < len) {
uint8_t c;
uint32_t delta = 0;
do {
c = buffer[pos++];
delta <<= 7;
delta |= c & 0x7f;
} while ((c & 0x80) && (pos < len));
if (c & 0x80) {
mp_raise_ValueError_varg(translate("Error in MIDI stream at position %d"), pos);
}
dur += delta * sample_rate / tempo;
switch (buffer[pos++] >> 4) {
case 8: { // Note Off
uint8_t note = parse_note(buffer, len, &pos);
// Ignore if not a note which is playing
synthio_midi_span_t last_span = self->track[self->total_spans - 1];
if (last_span.note[0] == note || last_span.note[1] == note) {
terminate_span(self, &dur, &max_dur);
if (last_span.note[0] == note) {
add_span(self, last_span.note[1], SILENCE);
} else {
add_span(self, last_span.note[0], SILENCE);
}
}
break;
}
case 9: { // Note On
uint8_t note = parse_note(buffer, len, &pos);
// Ignore if two notes are already playing
synthio_midi_span_t last_span = self->track[self->total_spans - 1];
if (last_span.note[1] == SILENCE) {
terminate_span(self, &dur, &max_dur);
if (last_span.note[0] == SILENCE) {
add_span(self, note, SILENCE);
} else {
add_span(self, last_span.note[0], note);
}
}
break;
}
case 10:
case 11:
case 14: // two data bytes to ignore
parse_note(buffer, len, &pos);
break;
case 12:
case 13: // one data byte to ignore
if (pos >= len || buffer[pos++] > 127) {
mp_raise_ValueError_varg(translate("Error in MIDI stream at position %d"), pos);
}
break;
case 15: // the full syntax is too complicated, just assume it's "End of Track" event
pos = len;
break;
default: // invalid event
mp_raise_ValueError_varg(translate("Error in MIDI stream at position %d"), pos);
}
}
terminate_span(self, &dur, &max_dur);
self->buffer_length = max_dur * BYTES_PER_SAMPLE;
self->buffer = m_malloc(self->buffer_length, false);
}
void common_hal_synthio_miditrack_deinit(synthio_miditrack_obj_t *self) {
m_free(self->buffer);
self->buffer = NULL;
m_free(self->track);
self->track = NULL;
}
bool common_hal_synthio_miditrack_deinited(synthio_miditrack_obj_t *self) {
return self->buffer == NULL;
}
uint32_t common_hal_synthio_miditrack_get_sample_rate(synthio_miditrack_obj_t *self) {
return self->sample_rate;
}
uint8_t common_hal_synthio_miditrack_get_bits_per_sample(synthio_miditrack_obj_t *self) {
return BITS_PER_SAMPLE;
}
uint8_t common_hal_synthio_miditrack_get_channel_count(synthio_miditrack_obj_t *self) {
return 1;
}
void synthio_miditrack_reset_buffer(synthio_miditrack_obj_t *self,
bool single_channel, uint8_t channel) {
self->next_span = 0;
}
STATIC const uint16_t notes[] = {8372, 8870, 9397, 9956, 10548, 11175, 11840,
12544, 13290, 14080, 14917, 15804}; // 9th octave
audioio_get_buffer_result_t synthio_miditrack_get_buffer(synthio_miditrack_obj_t *self,
bool single_channel, uint8_t channel, uint8_t **buffer, uint32_t *buffer_length) {
if (self->next_span >= self->total_spans) {
*buffer_length = 0;
return GET_BUFFER_DONE;
}
synthio_midi_span_t span = self->track[self->next_span++];
*buffer_length = span.dur * BYTES_PER_SAMPLE;
uint8_t octave1 = span.note[0] / 12; // 0..10
uint8_t octave2 = span.note[1] / 12; // 0..10
int32_t base_freq1 = notes[span.note[0] % 12];
int32_t base_freq2 = notes[span.note[1] % 12];
int32_t sample_rate = self->sample_rate;
for (uint16_t i = 0; i < span.dur; i++) {
int16_t semiperiod1 = span.note[0] == SILENCE ? 0 :
((base_freq1 * i * 2) / sample_rate) >> (10 - octave1);
int16_t semiperiod2 = span.note[1] == SILENCE ? semiperiod1 :
((base_freq2 * i * 2) / sample_rate) >> (10 - octave2);
self->buffer[i] = ((semiperiod1 % 2 + semiperiod2 % 2) - 1) * LOUDNESS;
}
*buffer = (uint8_t *)self->buffer;
return self->next_span >= self->total_spans ?
GET_BUFFER_DONE : GET_BUFFER_MORE_DATA;
}
void synthio_miditrack_get_buffer_structure(synthio_miditrack_obj_t *self, bool single_channel,
bool *single_buffer, bool *samples_signed, uint32_t *max_buffer_length, uint8_t *spacing) {
*single_buffer = true;
*samples_signed = true;
*max_buffer_length = self->buffer_length;
*spacing = 1;
}

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2021 Artyom Skrobov
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef MICROPY_INCLUDED_SHARED_MODULE_SYNTHIO_MIDITRACK_H
#define MICROPY_INCLUDED_SHARED_MODULE_SYNTHIO_MIDITRACK_H
#include "py/obj.h"
#include "shared-module/synthio/__init__.h"
typedef struct {
uint16_t dur;
uint8_t note[2];
} synthio_midi_span_t;
typedef struct {
mp_obj_base_t base;
uint32_t sample_rate;
uint16_t *buffer;
uint16_t buffer_length;
synthio_midi_span_t *track;
uint16_t next_span;
uint16_t total_spans;
} synthio_miditrack_obj_t;
// These are not available from Python because it may be called in an interrupt.
void synthio_miditrack_reset_buffer(synthio_miditrack_obj_t *self,
bool single_channel,
uint8_t channel);
audioio_get_buffer_result_t synthio_miditrack_get_buffer(synthio_miditrack_obj_t *self,
bool single_channel,
uint8_t channel,
uint8_t **buffer,
uint32_t *buffer_length); // length in bytes
void synthio_miditrack_get_buffer_structure(synthio_miditrack_obj_t *self, bool single_channel,
bool *single_buffer, bool *samples_signed,
uint32_t *max_buffer_length, uint8_t *spacing);
#endif // MICROPY_INCLUDED_SHARED_MODULE_SYNTHIO_MIDITRACK_H

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2021 Artyom Skrobov
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef MICROPY_INCLUDED_SHARED_MODULE_SYNTHIO__INIT__H
#define MICROPY_INCLUDED_SHARED_MODULE_SYNTHIO__INIT__H
#include "shared-module/audiocore/__init__.h"
#endif // MICROPY_INCLUDED_SHARED_MODULE_SYNTHIO__INIT__H

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