midilib

README

This internal library contains functions derived from the github.com/afandian/go-midi package of Joe Wass. These functions are in the file "derived.go". The original functions are in the files midi_functions.go and music.go which are copies of the corresponding files from github.com/afandian/go-midi.

The functions in the file "not-derived.go" are not derived from Joe Wass.

Documentation

Index

• func ClearBitU8(n uint8, pos uint8) uint8
• func IsChannelMessage(b uint8) bool
• func IsStatusByte(b uint8) bool
• func KeyFromSharpsOrFlats(sharpsOrFlats int8, mode uint8) uint8
• func MsbLsbSigned(n int16) uint16
• func MsbLsbUnsigned(n uint16) uint16
• func ParsePitchWheelVals(b1 byte, b2 byte) (relative int16, absolute uint16)
• func ParseStatus(b byte) (messageType uint8, messageChannel uint8)
• func ParseTwoUint7(b1, b2 byte) (uint8, uint8)
• func ParseUint7(b byte) uint8
• func ReadByte(rd io.Reader) (byte, error)
• func ReadNBytes(n int, rd io.Reader) ([]byte, error)
• func ReadUint16(rd io.Reader) (uint16, error)
• func ReadUint24(rd io.Reader) (uint32, error)
• func ReadUint32(rd io.Reader) (uint32, error)
• func ReadVarLength(reader io.Reader) (uint32, error)
• func ReadVarLengthData(reader io.Reader) ([]byte, error)

Functions

func ClearBitU8

func ClearBitU8(n uint8, pos uint8) uint8

ClearBitU8 clears the bit at position pos within n

func IsChannelMessage

func IsChannelMessage(b uint8) bool

IsChannelMessage returns if the given byte is a channel message

func IsStatusByte

func IsStatusByte(b uint8) bool

IsStatusByte returns if the given byte is a status byte

func KeyFromSharpsOrFlats

func KeyFromSharpsOrFlats(sharpsOrFlats int8, mode uint8) uint8

KeyFromSharpsOrFlats Taking a signed number of sharps or flats (positive for sharps, negative for flats) and a mode (0 for major, 1 for minor) decide the key signature.

This is a slightly modified variant of the keySignatureFromSharpsOrFlats function from Joe Wass. See the file music.go for the original.

func MsbLsbSigned

func MsbLsbSigned(n int16) uint16

MsbLsbSigned returns the uint16 for a signed MSB LSB message combination

func MsbLsbUnsigned

func MsbLsbUnsigned(n uint16) uint16

takes a 14bit uint and pads it to 16 bit like in the specs for e.g. pitchbend

func ParsePitchWheelVals

func ParsePitchWheelVals(b1 byte, b2 byte) (relative int16, absolute uint16)

ParsePitchWheelVals parses a 14-bit signed value, which becomes a signed int16.

This is a slightly modified variant of the parsePitchWheelValue function from Joe Wass. See the file midi_functions.go for the original.

func ParseStatus

func ParseStatus(b byte) (messageType uint8, messageChannel uint8)

ParseStatus parses the status byte and returns type and channel

This is a slightly modified variant of the readStatusByte function from Joe Wass. See the file midi_functions.go for the original.

func ParseTwoUint7

func ParseTwoUint7(b1, b2 byte) (uint8, uint8)

ParseTwoUint7 parses two 7-bit bit integer stored in two bytes, ignoring the high bit in each.

This is a slightly modified variant of the parseTwoUint7 function from Joe Wass. See the file midi_functions.go for the original.

func ParseUint7

func ParseUint7(b byte) uint8

ParseUint7 parses a 7-bit bit integer from a byte, ignoring the high bit.

This is a slightly modified variant of the parseUint7 function from Joe Wass. See the file midi_functions.go for the original.

func ReadByte

func ReadByte(rd io.Reader) (byte, error)

ReadByte reads a byte from the reader

func ReadNBytes

func ReadNBytes(n int, rd io.Reader) ([]byte, error)

ReadNBytes reads n bytes from the reader

func ReadUint16

func ReadUint16(rd io.Reader) (uint16, error)

ReadUint16 reads a 2-byte 16 bit integer from a Reader. It returns the 16-bit value and an error. This is a slightly modified variant of the parseUint16 function from Joe Wass. See the file midi_functions.go for the original.

func ReadUint24

func ReadUint24(rd io.Reader) (uint32, error)

ReadUint24 parse a 3-byte 24 bit integer from a Reader. It returns the 32-bit value and an error. This is a slightly modified variant of the parseUint24 function from Joe Wass. See the file midi_functions.go for the original.

func ReadUint32

func ReadUint32(rd io.Reader) (uint32, error)

ReadUint32 parse a 4-byte 32 bit integer from a Reader. It returns the 32-bit value and an error. This is a slightly modified variant of the parseUint32 function from Joe Wass. See the file midi_functions.go for the original.

func ReadVarLength

func ReadVarLength(reader io.Reader) (uint32, error)

ReadVarLength reads a variable length value from a Reader. It returns the [up to] 32-bit value and an error. This is a slightly modified variant of the parseVarLength function from Joe Wass. See the file midi_functions.go for the original.

func ReadVarLengthData

func ReadVarLengthData(reader io.Reader) ([]byte, error)

ReadVarLengthData reads data that is prefixed by a varLength that tells the length of the data

This is a slightly modified variant of the parseText function from Joe Wass. See the file midi_functions.go for the original.