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.
59 lines
1.2 KiB
C++
59 lines
1.2 KiB
C++
#include <iterator>
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#include <tuple>
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#include <cassert>
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#include <type_traits>
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#include "midi.hpp"
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#include "parse.hpp"
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struct mtrk_iterator {
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using difference_type = int32_t;
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using element_type = midi::mtrk_event_t;
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using pointer = element_type *;
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using reference = element_type &;
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uint8_t const * track_start;
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midi::track_t track;
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uint8_t running_status;
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uint8_t const * buf;
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uint8_t const * next_buf;
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midi::mtrk_event_t mtrk_event;
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mtrk_iterator() = delete;
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mtrk_iterator(const midi::track_t& track,
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uint8_t const * const track_start)
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: track_start(track_start)
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, track(track)
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, running_status(0)
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, buf(track_start)
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, next_buf(track_start)
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{
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}
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mtrk_iterator& operator=(mtrk_iterator&&) = default;
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constexpr mtrk_iterator(const mtrk_iterator&) = default;
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reference operator*() {
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auto mtrk_event_o = midi::parse::mtrk_event(buf, running_status);
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std::tie(next_buf, mtrk_event) = *mtrk_event_o;
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return mtrk_event;
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}
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mtrk_iterator operator++() {
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assert(buf != next_buf);
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buf = next_buf;
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return *this;
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}
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mtrk_iterator operator++(int) {
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mtrk_iterator tmp = *this;
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++(*this);
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return tmp;
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}
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bool at_end() {
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return buf - track_start >= track.length;
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}
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};
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