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Latest revision as of 23:24, 7 November 2009
Mirror of http://sndh.atari.org/fileformat.php.
; SNDH file structure, Revision 2.00
; Original SNDH Format devised by Jochen Knaus
; SNDH V1.1 Updated/Created by Anders Eriksson and Odd Skancke
; SNDH V2.0 by Phil Graham
; This document was originally created by Anders Eriksson, updated and
; adapted with SNDH v2 structures by Phil Graham.
; February, 2005
;
;
; All values are in MOTOROLA BIG ENDIAN format
;---------------------------------------------------------------------------
;Offset Size Function Example
;---------------------------------------------------------------------------
;0 4 INIT music driver bra.w init_music_driver
; (subtune number in d0.w)
;4 4 EXIT music driver bra.w exit_music_driver
;8 4 music driver PLAY bra.w vbl_play
;12 4 SNDH head dc.b 'SNDH'
;---------------------------------------------------------------------------
;Beneath follows the different TAGS that can (should) be used.
;The order of the TAGS is not important.
;---------------------------------------------------------------------------
;---------------------------------------------------------------------------
; TAG Description Example Termination
;---------------------------------------------------------------------------
; TITL Title of Song dc.b 'TITL','Led Storm',0 0 (Null)
; COMM Composer Name dc.b 'COMM','Tim Follin',0 0 (Null)
; RIPP Ripper Name dc.b 'RIPP','Me the hacker',0 0 (Null)
; CONV Converter Name dc.b 'CONV','Me the converter',0 0 (Null)
; ##?? Sub Tunes dc.b '##04',0 0 (Null)
; TA??? Timer A dc.b 'TA50',0 0 (Null)
; TB??? Timer B dc.b 'TB60',0 0 (Null)
; TC??? Timer C dc.b 'TC50',0 0 (Null)
; TD??? Timer D dc.b 'TD100',0 0 (Null)
; !V?? VBL dc.b '!V50',0 0 (Null)
; YEAR Year of release dc.b '1996',0 0 (Null) SNHDv2
; TIME (sub) tune time dc.b 'TIME' None SNDHv2
; (in seconds) dc.w x1,x2,x3,x4
; HDNS End of Header dc.b 'HDNS' None SNDHv2
; Must be on an
; EVEN boundary
;---------------------------------------------------------------------------
;Calling method and speed
;---------------------------------------------------------------------------
;This a very important part to do correctly.
;Here you specify what hardware interrupt to use for calling the music
;driver.
;
;These options are available;
;dc.b '!Vnn' VBL (nn=frequency)
;dc.b 'TAnnn',0 Timer A (nnn=frequency)
;dc.b 'TBnnn',0 Timer B (nnn=frequency)
;dc.b 'TCnnn',0 Timer C (nnn=frequency)
;dc.b 'TDnnn',0 Timer D (nnn=frequency)
;
;VBL - Is NOT recommended for use. There is no change made to the
; VBL frequency so it will play at the current VBL speed.
;
;Timer A - Is only recommended if Timer C is not accurate enough. Use
; with caution, many songs are using Timer A for special
; effects.
;
;Timer B - Is only recommended if Timer C is not accurate enough. Use
; with caution, many songs are using Timer B for special
; effects.
;
;Timer C - The default timer if nothing is specified. Default speed
; is 50Hz. Use Timer C playback wherever possible. It hooks
; up to the OS 200Hz Timer C interrupt and leaves all other
; interrupts free for special effects.
;
; For songs with a replay speed uneven of 200Hz, SND Player
; uses a smart routine to correct for the wrong speed. The
; result is usually very good. If the result isn't good
; enough,then consider another Timer, but be careful with
; Timer collisions!
;
;Timer D - Is only recommended if Timer C is not accurate enough.
; Use with caution, many songs are using Timer D for
; special effects.
;---------------------------------------------------------------------------
; TIME Tag
;---------------------------------------------------------------------------
; The TIME tag is followed by 'x' short words ('x' being the number of
; tunes). Each word contains the length of each sub tune in seconds. If the
; word is null then it is assumed that the tune endlessly loops.
;---------------------------------------------------------------------------
;---------------------------------------------------------------------------
; HDNS Tag
;---------------------------------------------------------------------------
; The HDNS signifies the end of the SNDH header and the start of the actual
; music data. This tag must be on an even boundary.
;---------------------------------------------------------------------------
;---------------------------------------------------------------------------
;Example of a complete SNDH header/file
;---------------------------------------------------------------------------
;
; section text
;
; bra.w sndh_init
; bra.w sndh_exit
; bra.w sndh_vbl
;
; dc.b 'SNDH'
; dc.b 'TITL','Odd Stuff Main Tune',0
; dc.b 'COMM','Dma-Sc / Sector one',0
; dc.b 'CONV','John Doe',0
; dc.b 'RIPP','Doe Johnson',0
; dc.b '##01',0
; dc.b 'TC50',0
; dc.b 'YEAR','2001',0
; dc.b 'TIME'
; dc.w $e1 ; 3 mins 45 secs = 225 seconds = $e1
; even
; dc.b 'HDNS'
;
;
;sndh_init:
; movem.l d0-a6,-(sp)
; lea songfile(pc),a0
; bsr.w player
; movem.l (sp)+,d0-a6
; rts
;
;sndh_exit:
; movem.l d0-a6,-(sp)
; bsr.w player+4
; movem.l (sp)+,d0-a6
; rts
;
;sndh_vbl:
; movem.l d0-a6,-(sp)
; bsr.w player+8
; movem.l (sp)+,d0-a6
; rts
;
; section data
;
;songfile:
; incbin 'mysong'
; even
;
;player:
; incbin 'replaycode.bin'
; even
;http://phf.atari.org/
;(EOF)
