MIDI File Dump Messages

Like any other System Exclusive message, the end of this message is indicated by the End of Exclusive message, or any MIDI message other than a System Real Time message

MIDI File Dump Messages


Status Byte	Data Bytes					Message	Description
F0	7E	dev	07	01	from_dev type length name	Header	File Header information
					Value	Description
					dev	Device ID of the device receiving the message. See MIDI Universal Sysex messages
					from_dev	Device ID of the device sending the message.
					type	4 bytes, ASCII. Type of file.
						`MIDI`	MIDI file
						`MIEX`	MIDIEX file
						`ESEQ`	ESEQ file
						`TEXT`	7-bit ascii text file
						`BIN`<space>	Binary file.
						`MAC`<space>	Macintosh file (with MacBinary file header).
					length	4 bytes, 7-bits/byte binary. Length of file (LSB first). (Note 1)
					name	zero or more ASCII characters. Any ASCII characters in the range `20-7E` are valid. The file name can be any length, and is ended by the normal End-Of-Exclusive indicator.
Status Byte	Data Bytes					Message	Description
F0	7E	dev	07	02	pp bytes-- data csum	Data Packet	Data packet with 1-128 bytes of data (after encoding)
					Value	Description
					dev	Device ID of the device receiving the message.
					pp	Packet number
					bytes--	Number of bytes minus one, ie `0`=one byte. `7F`=128 bytes. (Note 2)
					data	File data, encoded as 7-file bytes for every 8 bytes sent. See Note 3 for encoding This allows a maximum of 112 file-bytes to be sent in a single data packet of 128 bytes.
					csum	Logical XOR of all the data-bytes in the MIDI message, up to but not including csum. ie all bytes except the leading F0 and csum itself.
Status Byte	Data Bytes					Message	Description
F0	7E	dev	07	03	from_dev type name	Request	Request a file dump (requested by file name)
					Value	Description
					dev	As for the file dump Header message (above).
					from_dev
					type
					name

Footnotes

Note 1 - File length

This is the length of the original file, before to encoding.

Note 2 - Packet length

This is the length of the packet (minus 1) after encoding. A length of zero is take to mean 128.

Note 3 - Encoding

File-data is encoded such that 7 bytes of file-data are transmitted as 8 bytes of MIDI-data in the range 00-7F (as is required for all MIDI data-bytes).

Each set of 7 file-bytes (represented in binary here) with the Most Significant Bits stripped off and sent seperately, packed into the first byte.

File data (8-bit)	->	encoded MIDI data-bytes
`Aaaaaaaa`	->	`0ABCDEFG`
`Bbbbbbbb`		`0aaaaaaa`
`Cccccccc`		`0bbbbbbb`
`Dddddddd`		`0ccccccc`
`Dddddddd`		`0ddddddd`
`Eeeeeeee`		`0eeeeeee`
`Ffffffff`		`0fffffff`
`Gggggggg`		`0ggggggg`

In the case where there are less than 7 bytes to be encoded, the unused bits of the first byte are set to zero, eg

File data (8-bit)	->	encoded MIDI data-bytes
`Aaaaaaaa`	->	`0AB00000`
`Bbbbbbbb`		`0aaaaaaa`
`Bbbbbbbb`		`0bbbbbbb`

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