Date: Wed, 9 Mar 94 16:14:20 PST From: awiggins@sdcc5.UCSD.EDU (Adam Wiggins) Subject: Re: Need CMF format Newsgroups: rec.games.programmer > I need the format of CMF files, particularly the FM instruments part. >Thanks in advance. CMF consists of 3 different block structures: header block, instrument block and a music block. Header Block. Offset Description 00-03 File ID'CTMF' 04-05 Version # (currently 1.10) 06-07 Offset of instrument block from start of file 08-09 Offset of music block from start of file 0A-0B Ticks per quarter note (default=120) 0C-0D Clock ticks per second (default=96) 0E-0F Offset of music title from start of file (0=none) 10-11 Offset of composer name (0=none) 12-13 Offset of remarks (0=none) 14-23 Channel-in-use table (16 bytes long) 24-25 # of instruments used 26-27 Basic tempo 28- Title, composer and/or remarks Instrument Block Each instrument block is 16 bytes long. Offset Description 00 Modulator characteristic 01 Carrier characteristic bit 7 Pitch Vibrato 6 Amplitude Vibrato 5 Sustaining Sound 4 Envelope Scaling 3-0 Frequency Multiplier 02 Modulator Scaling/Output Level 03 Carrier Scaling/Output Level bit 7-6 Level Scaling 5-0 Output Level 04 Modulator Attack/Delay 05 Carrier Attack/Delay bit 7-4 Attack Rate 3-0 Delay Rate 06 Modulator Sustain Level/Release Rate 07 Carrier Sustain Level/Release Rate bit 7-4 Sustain Level 3-0 Release Rate 08 Modulator Wave Select 09 Carrier Wave Select bit 7-2 (all cleared) 0-1 Wave Select 0A Feedback/Connection bit 7-4 (cleared) 3-1 Modulator Feedback 0 Connection 0B-0F Not used (Reserved) Music Block The music block is single track, polyphonic, with a max of 16 channels. It adheres to the Standard Midi File format. It is like: Music block = ... where: Delta time = amount of time before Midi event (in ticks) Midi event = any Midi channel message Here is where the book gets foggy. Some Midi events are Control Change events but it doesn't say if all are like that. These are the only ones discussed: Control Number Control Data 66h 1-127 (Used as markers in music) 67h 0-Melody mode 1-Rhythm mode I don't know of the 0 or 1 are bits or follow the Control Number but it appears that there will be a 66h then a number between 1 and 127 designating seminote length (1 seminote = 1/128 of a tick or something) or a 67h and a 0 or 1 to determine the mode. In Rhythm mode, the last 5 channels are: Channel Rhythm 12 Bass Drum 13 Snare 14 Tom-tom 15 Top-cymbal 16 High-hat Control Number Control Data 68h 0-127 (Changes pitch upward by the # of 1/128 seminotes. 0=Cancel pitch change) 69h 0-127 (Changes pitch downward by the # of 1/128 seminotes. 0=Cancel pitch change) Sorry about the ^M's. ...Boone