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SpaceCadetPinball/SpaceCadetPinball/midi.h
Muzychenko Andrey 2162cac977 Moved SDL mixer initialization out of partial restart loop.
This might help with issue #167.
2022-12-02 14:46:22 +03:00

117 lines
2.4 KiB
C++

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