Zack Buhman
86d12c37ed
This adds both a midi generator and a midi type 1 simulator. While I would have preferred to use an existing tool for this, I found that timidity++ does not emit pitch wheel events correctly, and I don't know of another widely-distributed tool that does midi-to-midi format conversion. The c++ and python versions were co-developed. I wrote one to test the other. There is more cleanup to do, but `roundtrip.cpp` produces a valid type 0 midi file given a type 1 or type 0 midi file as input.
137 lines
2.1 KiB
C++
137 lines
2.1 KiB
C++
#pragma once
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#include <cstdint>
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namespace midi {
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struct division_t {
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enum struct type_t : uint8_t {
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time_code,
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metrical,
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} type;
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union {
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struct {
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int8_t smpte;
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uint8_t ticks_per_frame;
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} time_code;
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struct {
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uint16_t ticks_per_quarter_note;
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} metrical;
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};
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};
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struct header_t {
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enum struct format_t : uint8_t {
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_0,
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_1,
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_2,
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} format;
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uint16_t ntrks;
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division_t division;
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};
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struct midi_event_t {
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struct note_off_t {
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uint8_t channel;
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uint8_t note;
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uint8_t velocity;
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};
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struct note_on_t {
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uint8_t channel;
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uint8_t note;
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uint8_t velocity;
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};
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struct polyphonic_key_pressure_t {
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uint8_t channel;
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uint8_t note;
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uint8_t pressure;
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};
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struct control_change_t {
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uint8_t channel;
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uint8_t control;
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uint8_t value;
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};
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struct program_change_t {
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uint8_t channel;
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uint8_t program;
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};
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struct channel_pressure_t {
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uint8_t channel;
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uint8_t pressure;
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};
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struct pitch_bend_change_t {
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uint8_t channel;
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uint8_t lsb;
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uint8_t msb;
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};
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struct channel_mode_t {
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uint8_t channel;
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uint8_t controller;
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uint8_t value;
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};
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enum struct type_t {
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note_off,
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note_on,
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polyphonic_key_pressure,
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control_change,
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program_change,
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channel_pressure,
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pitch_bend_change,
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channel_mode,
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} type;
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union event_t {
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note_off_t note_off;
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note_on_t note_on;
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polyphonic_key_pressure_t polyphonic_key_pressure;
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control_change_t control_change;
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program_change_t program_change;
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channel_pressure_t channel_pressure;
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pitch_bend_change_t pitch_bend_change;
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channel_mode_t channel_mode;
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} data;
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};
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struct sysex_event_t {
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const uint8_t * data;
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uint32_t length;
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uint8_t tag;
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};
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struct meta_event_t {
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const uint8_t * data;
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uint32_t length;
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uint8_t type;
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};
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struct event_t {
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enum struct type_t {
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midi,
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sysex,
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meta,
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} type;
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union _event_t {
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midi_event_t midi;
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sysex_event_t sysex;
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meta_event_t meta;
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} event;
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};
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struct mtrk_event_t {
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uint32_t delta_time;
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event_t event;
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};
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struct track_t {
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uint32_t length;
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};
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} // midi
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