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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.
*/
#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,
};
MP_REGISTER_MODULE(MP_QSTR_synthio, synthio_module, CIRCUITPY_SYNTHIO);
|
