; You dont need this global, but you can use it to see the data size of your wav file for max value
Global s_datalenght%


Graphics 640,480,0,2
SetBuffer BackBuffer ()

;LoadLoopSound("test.wav",0,0) ; no loop
LoadLoopSound("test.wav",1,s_datalenght) ; maximum loop
;LoadLoopSound("test.wav",800,8000) ; what you want but not more then datalenght

musik = LoadSound ("s_temp.wav")
DeleteFile "s_temp.wav"


While Not KeyHit (1)
Cls
If KeyHit (57) Then
PlaySound (musik)
EndIf
Text 10,10,"Press space to play"
Text 10,20, "Datasize = "+s_datalenght
Flip
Wend
End



Function LoadLoopSound(s_file$,s_start%,s_end%)

;**********************************
;**** Read Source Wav File *****
;**********************************
s_source = ReadFile (s_file)

; read RIFF header (1179011410) to see if it is a wav file
s_check = ReadInt (s_source)
      If s_check = 1179011410 Then ; RIFF found
            s_check = ReadInt (s_source)
            s_sourcesize = (s_check + 8) ; size of sourcefile
            s_check = ReadInt (s_source) ; read "wave"
      EndIf   
If Not s_check = 1163280727 Then Return 0 ; no wave..go away with that :)
                     
; search and read   FMT chunk for sample infos      
s_position = 12
s_goal = 0
Repeat
      SeekFile s_source, s_position
            s_check = ReadInt (s_source)
                  If s_check = 544501094 Then ; FMT found
                        s_goal = 1 ; now lets read and store all the infos
                              s_fmtsize = ReadInt (s_source) ;<fmt length>  size of this chunk, normal = 16 byte from here
                              s_format = ReadShort (s_source)   ;<format tag>    sample format, normal = 1 (hex) for PCM
                              s_channels = Readshort (s_source) ;<channels>  1 = mono, 2 = stereo
                              s_rate = ReadInt (s_source) ;<sample rate>    (hz)
                              s_bytes = ReadInt (s_source) ;<bytes/second>    Sample-Rate * Block-Align
                              s_block = Readshort (s_source) ;<block align>    Channels * bits/sample / 8
                              s_bit = Readshort (s_source) ;<bits/sample>    8, 16 or 24
                  EndIf
            s_position = s_position +1 ;FMT not found, next step
If s_goal = 1 Then Exit   ; ok    
Until Eof (s_source) = 1
If s_goal = 0 Then Return 0 ; no FMT found, Error

; search and read DATA chunk
s_position =12
s_goal = 0
Repeat
      SeekFile s_source, s_position
            s_check = ReadInt (s_source)
            If s_check = 1635017060 Then ; DATA found
                  s_goal = 1
                  s_datalenght = ReadInt (s_source) ;<length> of data block
                  sbank_cache = CreateBank (s_datalenght) ; now we store the sample data
                        For i = 0 To (s_datalenght-1)
                              s_value = ReadByte (s_source)
                              PokeByte sbank_cache,i,s_value
                        Next
            EndIf
      s_position = s_position +1 ; DATA not found, next step
If s_goal = 1 Then Exit ; ok
Until Eof (s_source) = 1
If s_goal = 0 Then Return 0 ; no DATA found, Error

CloseFile s_source ; we have what we need, all other chunks we can ignore

;**********************************
;**** Write temp Wav File *****
;**********************************

s_temp = WriteFile ("s_temp.wav") ; create a temp

;write RIFF header
WriteInt s_temp, 1179011410 ; RIFF
WriteInt s_temp, s_sourcesize-8 ;size of header
WriteInt s_temp, 1163280727 ; WAVE

;write FMT chunk
WriteInt s_temp, 544501094 ; FMT
WriteInt s_temp, s_fmtsize ;<fmt length>
WriteShort s_temp, s_format ;<format tag>
WriteShort s_temp, s_channels ;<channels>
WriteInt s_temp, s_rate ;<sample rate>
WriteInt s_temp, s_bytes ;<bytes/second>
WriteShort s_temp, s_block ;<block align>
WriteShort s_temp, s_bit ;<bits/sample>
                  
;write SMPL chunk
WriteInt s_temp, 1819307379 ;SMPL
WriteInt s_temp, 60 ;36 + 1 sample loop section (24)
WriteInt s_temp, 0 ; Manufacturer , we dont need    
WriteInt s_temp, 0   ; ProductID , we dont need
WriteInt s_temp, 0   ;Sample Period    ,not supported by blitzbasic
WriteInt s_temp, 0   ;MIDI Unity Note    ,not supported by blitzbasic
WriteInt s_temp, 0   ;MIDI Pitch Fraction    ,not supported by blitzbasic
WriteInt s_temp, 0   ;SMPTE Format    ,not supported by blitzbasic
WriteInt s_temp, 0   ;SMPTE Offset    ,not supported by blitzbasic
WriteInt s_temp, 0 ;Num Sample Loops    ,not supported by blitzbasic
WriteInt s_temp, 0   ;Sampler Data    ,not supported by blitzbasic

WriteInt s_temp, 0 ;Cue Point ,not supported by blitzbasic
WriteInt s_temp, 0 ;Type    ,not supported by blitzbasic
WriteInt s_temp, s_start ;   Start loop
WriteInt s_temp, s_end ;End loop
WriteInt s_temp, 0 ;Fraction ,not supported by blitzbasic
WriteInt s_temp, 0 ;Play Count ,not supported by blitzbasic

;write DATA chunk & data
WriteInt s_temp, 1635017060 ; DATA
WriteInt s_temp, s_datalenght ;<length>
WriteBytes (sbank_cache,s_temp,0,s_datalenght) ;sample data from bank
FreeBank sbank_cache ; we no need this longer

CloseFile s_temp

End Function