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Programmieren
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ACE
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play.b
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1994-10-02
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{
<< play a sound file! >>
Currently handles IFF 8SVX format.
If format is unknown, a default
sampling rate is assumed.
USAGE
-----
CLI/Shell: Play [<file> [<sampling rate>]] | ?
Author: David J Benn
Date: 6th,7th April,16th May,
30th June,
1st,3rd,4th,8th,28th July 1992,
6th,21st,25th January 1993,
3rd February 1993,
10th July 1993,
3rd January 1994
}
declare function xRead& library
longint offset&,samples_per_second&
string path$
SUB parse_sample(f$)
shared offset&,samples_per_second&
const default_rate=10000&
{ if IFF 8SVX sample, return
offset from start of file to
sample data and sampling rate in
samples per second. }
open "I",1,f$
'..skip FORM#### ?
dummy$=input$(8,#1)
'..8SVX ?
x$=input$(4,#1)
if x$="8SVX" then
sample_format$="IFF 8SVX"
'..skip VHDR###
dummy$=input$(8,#1)
'..skip ULONGs x 3
dummy$=input$(12,#1)
'..get sampling rate bytes
hi%=asc(input$(1,#1)) '..high byte
lo%=asc(input$(1,#1)) '..low byte
samples_per_second&=hi%*256 + lo%
'..find BODY
'..skip rest of Voice8Header structure
dummy$=input$(6,#1)
offset&=40 '..bytes up to this point
repeat
repeat
x$=input$(1,#1)
offset&=offset&+1
until x$="B" and not eof(1)
if not eof(1) then
body$=input$(3,#1)
offset&=offset&+3
end if
until body$="ODY" and not eof(1)
if not eof(1) then
x$=input$(4,#1) '..skip ####
offset&=offset&+4
else
print "Error in file format!"
stop
end if
close 1
else
close 1
sample_format$="unknown"
offset&=0
if argcount<>2 then samples_per_second&=default_rate
end if
'.. give info about sample
print "Sound file format is ";sample_format$;"."
if sample_format$="unknown" then
if argcount<>2 then
print "Playback rate is";samples_per_second&;"Hz."
end if
else
print "Sample was recorded at";samples_per_second&;"Hz."
end if
END SUB
SUB play_sound(f$)
shared offset&,samples_per_second&
const maxsample=131070
const channel=1
const CHIP=0, MAXCHIP=2
dim wave_ptr&(100)
print
print "*** ACE sound player ***"
'..file sample_size?
open "I",1,f$
sample_size&=lof(1)
close 1
if sample_size&<>0 then
print f$;" contains";sample_size&;"bytes."
else
print "Can't open ";f$;"."
stop
end if
parse_sample(f$)
'..get the sample bytes
buffer&=Alloc(sample_size&,CHIP) '...sample_size& bytes of CHIP RAM
if buffer& = NULL then
avail&=fre(MAXCHIP) '..max. contiguous CHIP RAM
print "Largest contiguous CHIP RAM is";avail&;"bytes."
stop
end if
open "I",1,f$
fh&=handle(1)
if fh&=0 then
print "Can't open ";f$;"."
stop
end if
bytes&=xRead(fh&,buffer&,sample_size&)
close 1
'..calculate period
if argcount<>2 then
per& = 3579546 \ samples_per_second&
else
sample_rate_requested&=clng(val(arg$(2)))
per& = 3579546 \ sample_rate_requested&
print "Requested sampling rate is";sample_rate_requested&;"Hz."
end if
'...setup waveform table for voice 0
sz&=sample_size&-offset&
if sz& <= maxsample then
'..play it in one go
wave channel,buffer&+offset&,sz&
dur&=.279365*per&*bytes&/1e6*18.2
sound per&,dur&,,channel
else
segments&=sz&\maxsample
buf&=buffer&+offset&
'..get the segment pointers
for i&=0 to segments&
wave_ptr&(i&)=buf&+maxsample*i&
next
'..play sample in segments
for i&=0 to segments&
if sz& >= maxsample then
wave channel,wave_ptr&(i&),maxsample
bytes&=maxsample
else
wave channel,wave_ptr&(i&),sz&
bytes&=sz&
end if
dur&=.279365*per&*bytes&/1e6*18.2
sound per&,dur&,,channel
sz&=sz&-maxsample
next
end if
END SUB
{ ** main ** }
if argcount=0 then
path$ = FileBox$("Choose a sound sample")
else
if arg$(1)="?" then
print "usage: ";arg$(0);" [<file> [<sampling rate>]] | ?"
stop
else
path$ = arg$(1)
end if
end if
if path$<>"" then
play_sound(path$)
else
dummy = MsgBox("No sound file selected.","OK")
end if