mirror of
https://github.com/irmen/prog8.git
synced 2024-12-26 14:29:35 +00:00
87 lines
2.8 KiB
Lua
87 lines
2.8 KiB
Lua
%import textio
|
|
%import diskio
|
|
%import cx16diskio
|
|
%zpreserved $22,$2d ; zsound lib uses this region
|
|
|
|
; NOTE: this is a proof of concept to stream ZCM digi from disk while playing.
|
|
; currently there's no real streaming API / circular buffer in zsound,
|
|
; so it simply loads the whole ZCM file in chunks in memory sequentially.
|
|
; But it does so while the playback is going on in the background.
|
|
; It seems fast enough to stream + play 16khz 16bit stereo samples. (around 64 Kb/sec)
|
|
; Maybe we can go faster but 22 Khz seemed too much to keep up with.
|
|
|
|
main $0830 {
|
|
|
|
zsound_lib:
|
|
; this has to be the first statement to make sure it loads at the specified module address $0830
|
|
%asmbinary "zsound_combo-0830.bin"
|
|
|
|
; note: jump table is offset by 2 from the load address (because of prg header)
|
|
romsub $0832 = zsm_init() clobbers(A)
|
|
romsub $0835 = zsm_play() clobbers(A, X, Y)
|
|
romsub $0838 = zsm_playIRQ() clobbers(A, X, Y)
|
|
romsub $083b = zsm_start(ubyte bank @A, uword song_address @XY) clobbers(A, X, Y) -> ubyte @Pc
|
|
romsub $083e = zsm_stop()
|
|
romsub $0841 = zsm_setspeed(uword hz @XY) clobbers(A, X, Y)
|
|
romsub $0844 = zsm_setloop(ubyte count @A)
|
|
romsub $0847 = zsm_forceloop(ubyte count @A)
|
|
romsub $084a = zsm_noloop()
|
|
romsub $084d = zsm_setcallback(uword address @XY)
|
|
romsub $0850 = zsm_clearcallback() clobbers(A)
|
|
romsub $0853 = zsm_get_music_speed() clobbers(A) -> uword @XY
|
|
romsub $0856 = pcm_init() clobbers(A)
|
|
romsub $0859 = pcm_trigger_digi(ubyte bank @A, uword song_address @XY)
|
|
romsub $085c = pcm_play() clobbers(A, X, Y)
|
|
romsub $085f = pcm_stop() clobbers(A)
|
|
romsub $0862 = pcm_set_volume(ubyte volume @A)
|
|
|
|
const ubyte digi_bank = 1
|
|
const uword digi_address = $a000
|
|
const ubyte zcm_DIGITAB_size = 8 ; header size
|
|
const uword ram_bank_size = $2000
|
|
|
|
ubyte load_ok = false
|
|
|
|
sub prebuffer() {
|
|
txt.print("prebuffering...")
|
|
void cx16diskio.f_read(digi_address, ram_bank_size*4)
|
|
}
|
|
|
|
sub start() {
|
|
txt.print("\nzsound digi streaming!\n")
|
|
|
|
if not diskio.f_open(8, "thriller.zcm") {
|
|
txt.print("?no file\n")
|
|
return
|
|
}
|
|
|
|
cx16.rambank(digi_bank)
|
|
prebuffer()
|
|
|
|
pcm_init()
|
|
pcm_trigger_digi(digi_bank, digi_address)
|
|
cx16.set_irq(&zsm_playroutine_irq, true)
|
|
|
|
txt.print("\nstreaming from file, playback in irq!\n")
|
|
uword size = 1
|
|
while size {
|
|
size = cx16diskio.f_read(digi_address, ram_bank_size) ; load next bank
|
|
txt.print_ub(cx16.getrambank())
|
|
txt.spc()
|
|
sys.wait(5) ; artificial delay
|
|
}
|
|
|
|
txt.print("sound file end reached.\n")
|
|
diskio.f_close()
|
|
|
|
repeat {
|
|
}
|
|
|
|
pcm_stop() ;unreached
|
|
}
|
|
|
|
sub zsm_playroutine_irq() {
|
|
pcm_play()
|
|
}
|
|
}
|