117 lines
2.4 KiB
C++
117 lines
2.4 KiB
C++
#pragma once
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constexpr uint32_t SwapByteOrderInt(uint32_t val)
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{
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return (val >> 24) |
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((val << 8) & 0x00FF0000) |
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((val >> 8) & 0x0000FF00) |
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(val << 24);
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}
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constexpr uint16_t SwapByteOrderShort(uint16_t val)
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{
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return static_cast<uint16_t>((val >> 8) | (val << 8));
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}
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#pragma pack(push)
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#pragma pack(1)
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struct riff_block
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{
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uint32_t TkStart;
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uint32_t CbBuffer;
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char AData[4];
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};
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struct riff_data
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{
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uint32_t Data;
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uint32_t DataSize;
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uint32_t BlocksPerChunk;
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riff_block Blocks[1];
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};
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struct riff_header
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{
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uint32_t Riff;
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uint32_t FileSize;
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uint32_t Mids;
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uint32_t Fmt;
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uint32_t FmtSize;
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uint32_t dwTimeFormat;
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uint32_t cbMaxBuffer;
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uint32_t dwFlags;
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riff_data Data;
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};
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struct midi_event
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{
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uint32_t iTicks;
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uint32_t iEvent;
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};
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struct midi_header
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{
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explicit midi_header(uint16_t tickdiv)
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: tickdiv(tickdiv)
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{
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}
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const char MThd[4]{'M', 'T', 'h', 'd'};
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const uint32_t chunklen = SwapByteOrderInt(6);
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const int16_t format = SwapByteOrderShort(0);
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const uint16_t ntracks = SwapByteOrderShort(1);
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uint16_t tickdiv;
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};
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struct midi_track
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{
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explicit midi_track(uint32_t chunklen)
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: chunklen(chunklen)
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{
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}
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const char MTrk[4]{'M', 'T', 'r', 'k'};
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uint32_t chunklen;
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};
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static_assert(sizeof(riff_block) == 0xC, "Wrong size of riff_block");
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static_assert(sizeof(riff_data) == 0x18, "Wrong size of riff_data");
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static_assert(sizeof(riff_header) == 0x38, "Wrong size of riff_header");
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static_assert(sizeof(midi_event) == 8, "Wrong size of midi_event2");
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static_assert(sizeof(midi_header) == 14, "Wrong size of midi_header");
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static_assert(sizeof(midi_track) == 8, "Wrong size of midi_track");
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#pragma pack(pop)
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enum class MidiTracks
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{
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None,
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Track1,
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Track2,
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Track3
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};
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class midi
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{
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public:
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static int music_init(bool mixOpen, int volume);
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static void music_shutdown();
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static void music_play();
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static void music_stop();
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static void SetVolume(int volume);
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static bool play_track(MidiTracks track, bool replay);
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static MidiTracks get_active_track();
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private:
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static std::vector<Mix_Music*> LoadedTracks;
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static Mix_Music* track1, * track2, * track3;
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static MidiTracks active_track, NextTrack;
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static int Volume;
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static bool IsPlaying, MixOpen;
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static void StopPlayback();
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static Mix_Music* load_track(std::string fileName);
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static Mix_Music* load_track_sub(std::string fileName, bool isMidi);
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static Mix_Music* TrackToMidi(MidiTracks track);
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static std::vector<uint8_t>* MdsToMidi(std::string file);
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};
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