103 lines
2.3 KiB
Plaintext
103 lines
2.3 KiB
Plaintext
-- @include constants.txt
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-- @include track.txt
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-- @include /koptilnya/libs/utils.txt
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require("track.txt")
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require("/koptilnya/libs/utils.txt")
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local CONSTANTS = require("constants.txt")
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function byteToHex(byte)
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return tostring(byte)
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end
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MidiPlayer = class("MidiPlayer")
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function MidiPlayer:initialize()
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self._startTime = 0
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self._buffer = nil
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self._midiChunksByteLength = nil
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self._division = 0
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self._format = nil
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self._setIntervalId = false
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self._tracks = {}
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self._instruments = {}
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self._defaultTempo = 120
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self._tempo = null
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self._startTick = 0
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self._tick = 0
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self._lastTick = null
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self._inLoop = false
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self._totalTicks = 0
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self._events = {}
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self._totalEvents = 0
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self._eventListeners = {}
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end
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function MidiPlayer:loadURL(link)
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if not http.canRequest() then
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return
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end
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http.get(link, function(data, len)
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self._buffer = data
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self:_fileLoaded()
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end)
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end
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function MidiPlayer:_fileLoaded()
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if not self:isValid() then
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throw("Invalid MIDI file; should start with MThd")
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end
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self:setTempo(self._defaultTempo)
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self:_parseDivision()
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self:_parseFormat()
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self:_parseTracks()
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end
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function MidiPlayer:isValid()
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return string.char(unpack(byteTable(self._buffer, 1, 4))) == "MThd"
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end
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function MidiPlayer:setTempo(tempo)
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self._tempo = tempo
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end
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function MidiPlayer:_parseDivision()
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self._division = tonumber(bytesToHex(byteTable(self._buffer, 13, 2)))
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end
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function MidiPlayer:_parseFormat()
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self._format = tonumber(bytesToHex(byteTable(self._buffer, 9, 2)))
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end
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function MidiPlayer:_parseTracks()
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self._tracks = {}
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local offset = 1
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while offset < #self._buffer do
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local length = tonumber(bytesToHex(byteTable(self._buffer, offset + 4, 4)))
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if string.char(unpack(byteTable(self._buffer, offset, 4))) == "MTrk" then
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table.insert(self._tracks, MidiTrack:new(#self._tracks + 1, string.sub(self._buffer, offset + 8, offset + 8 + length)))
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end
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offset = offset + length + 8
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end
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end
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function MidiPlayer:resetTracks()
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for _, v in pairs(self._tracks) do
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v:reset()
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end
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end
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function MidiPlayer:enableTrack(id)
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self._tracks[id]:enable()
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end
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function MidiPlayer:disableTrack(id)
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self._tracks[id]:disable()
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end |