adpcm plays pcm

This commit is contained in:
Irmen de Jong 2022-11-24 21:03:50 +01:00
parent 483f313eda
commit 0d0ce6eec1

View File

@ -1,37 +1,102 @@
%import textio %import textio
%option no_sysinit
%zeropage basicsafe
main { main {
sub start() { sub start() {
cx16.VERA_AUDIO_CTRL = %10101111 ; mono 16 bit
cx16.VERA_AUDIO_RATE = 0 ; halt playback
cx16.VERA_IEN &= %11110111 ; disable AFLOW
repeat 4096 {
cx16.VERA_AUDIO_DATA = 0
}
; cx16.set_rasterirq(irqhandler, 10) cx16.VERA_AUDIO_RATE = 16
uword adpcm_size = &adpcm_data_end - &adpcm_data
uword num_adpcm_blocks = adpcm_size / 256
uword nibblesptr = &adpcm_data
num_adpcm_blocks = 1 uword pcm_size = &pcm_data_end - &pcm_data
nibblesptr = &nibbles uword num_blocks = pcm_size / 1024
uword pcm_ptr = &pcm_data
repeat num_adpcm_blocks { txt.print("audio on.\n")
uword @zp sample = peekw(nibblesptr)
nibblesptr += 2
adpcm.init(sample, @(nibblesptr))
nibblesptr += 2
repeat 252 { repeat num_blocks {
ubyte @zp nibble = @(nibblesptr) ; wait till the fifo is empty (fully empty??)
adpcm.decode_nibble(nibble & 15) while not (cx16.VERA_AUDIO_CTRL & %01000000) {
txt.print_w(adpcm.predict as word) ; wait
txt.spc() }
adpcm.decode_nibble(nibble>>4)
txt.print_w(adpcm.predict as word) ; fill more audio data
txt.spc() repeat 512 {
nibblesptr++ cx16.VERA_AUDIO_DATA = @(pcm_ptr)
pcm_ptr++
cx16.VERA_AUDIO_DATA = @(pcm_ptr)
pcm_ptr++
} }
} }
repeat { cx16.VERA_AUDIO_CTRL = %00100000
} cx16.VERA_AUDIO_RATE = 0
txt.print("audio off.\n")
; uword adpcm_size = &adpcm_data_end - &adpcm_data
; uword num_adpcm_blocks = adpcm_size / 256
; uword nibblesptr = &adpcm_data
;
; nibblesptr = &nibbles
; repeat num_adpcm_blocks {
; ; wait till the fifo is empty (fully empty??)
; while not (cx16.VERA_AUDIO_CTRL & %01000000) {
; ; wait
; }
;
; ; decode another adpcm block
; uword @zp sample = peekw(nibblesptr)
; nibblesptr += 2
; adpcm.init(sample, @(nibblesptr))
; nibblesptr += 2
;
; repeat 252 {
; ubyte @zp nibble = @(nibblesptr)
; adpcm.decode_nibble(nibble & 15)
; ; adpcm.predict as word
; cx16.VERA_AUDIO_DATA = lsb(adpcm.predict)
; cx16.VERA_AUDIO_DATA = msb(adpcm.predict)
; adpcm.decode_nibble(nibble>>4)
; ; adpcm.predict as word
; cx16.VERA_AUDIO_DATA = lsb(adpcm.predict)
; cx16.VERA_AUDIO_DATA = msb(adpcm.predict)
; nibblesptr++
; }
; }
; cx16.set_rasterirq(irqhandler, 10)
; uword adpcm_size = &adpcm_data_end - &adpcm_data
; uword num_adpcm_blocks = adpcm_size / 256
; uword nibblesptr = &adpcm_data
;
; num_adpcm_blocks = 1
; nibblesptr = &nibbles
;
; repeat num_adpcm_blocks {
; uword @zp sample = peekw(nibblesptr)
; nibblesptr += 2
; adpcm.init(sample, @(nibblesptr))
; nibblesptr += 2
;
; repeat 252 {
; ubyte @zp nibble = @(nibblesptr)
; adpcm.decode_nibble(nibble & 15)
; txt.print_w(adpcm.predict as word)
; txt.spc()
; adpcm.decode_nibble(nibble>>4)
; txt.print_w(adpcm.predict as word)
; txt.spc()
; nibblesptr++
; }
; }
} }
; sub irqhandler() { ; sub irqhandler() {
@ -41,7 +106,7 @@ main {
; adpcm.init(sample, nibbles[2]) ; adpcm.init(sample, nibbles[2])
; ;
; ubyte @zp idx = 4 ; ubyte @zp idx = 4
; while idx<100 { ; while idx<200 {
; ubyte @zp nibble = nibbles[idx] ; ubyte @zp nibble = nibbles[idx]
; adpcm.decode_nibble(nibble & 15) ; adpcm.decode_nibble(nibble & 15)
; sample = adpcm.predict ; sample = adpcm.predict
@ -54,25 +119,29 @@ main {
; cx16.vpoke(1, $fa00,0) ; cx16.vpoke(1, $fa00,0)
; } ; }
adpcm_data: ;adpcm_data:
%asmbinary "adpcm-mono.bin" ; %asmbinary "adpcm-mono.bin"
adpcm_data_end: ;adpcm_data_end:
ubyte[256] nibbles = [216, 227, 59, 0, 32, 2, 186, 139, 24, 34, 84, 115, 19, 185, 173, 8, 0, 56, 162, ; ubyte[256] nibbles = [216, 227, 59, 0, 32, 2, 186, 139, 24, 34, 84, 115, 19, 185, 173, 8, 0, 56, 162,
169, 144, 113, 55, 130, 186, 12, 33, 144, 10, 136, 10, 129, 41, 66, 210, 207, ; 169, 144, 113, 55, 130, 186, 12, 33, 144, 10, 136, 10, 129, 41, 66, 210, 207,
9, 0, 153, 129, 185, 173, 155, 0, 37, 162, 191, 27, 36, 129, 144, 137, 82, 18, ; 9, 0, 153, 129, 185, 173, 155, 0, 37, 162, 191, 27, 36, 129, 144, 137, 82, 18,
87, 18, 152, 153, 136, 0, 32, 23, 0, 40, 24, 117, 19, 202, 138, 8, 176, 171, ; 87, 18, 152, 153, 136, 0, 32, 23, 0, 40, 24, 117, 19, 202, 138, 8, 176, 171,
24, 131, 234, 9, 32, 39, 160, 10, 153, 33, 52, 209, 137, 200, 73, 33, 233, 155, ; 24, 131, 234, 9, 32, 39, 160, 10, 153, 33, 52, 209, 137, 200, 73, 33, 233, 155,
136, 66, 146, 8, 152, 56, 131, 113, 23, 168, 169, 185, 9, 160, 65, 37, 49, 22, ; 136, 66, 146, 8, 152, 56, 131, 113, 23, 168, 169, 185, 9, 160, 65, 37, 49, 22,
64, 68, 168, 138, 153, 1, 171, 88, 35, 25, 65, 1, 176, 173, 185, 175, 168, 154, ; 64, 68, 168, 138, 153, 1, 171, 88, 35, 25, 65, 1, 176, 173, 185, 175, 168, 154,
153, 205, 138, 144, 152, 154, 204, 43, 53, 51, 35, 154, 184, 96, 71, 34, 152, ; 153, 205, 138, 144, 152, 154, 204, 43, 53, 51, 35, 154, 184, 96, 71, 34, 152,
172, 138, 160, 9, 24, 16, 204, 88, 48, 54, 160, 172, 152, 65, 132, 168, 48, 4, ; 172, 138, 160, 9, 24, 16, 204, 88, 48, 54, 160, 172, 152, 65, 132, 168, 48, 4,
0, 190, 9, 161, 155, 218, 139, 154, 185, 207, 9, 50, 130, 184, 252, 155, 24, ; 0, 190, 9, 161, 155, 218, 139, 154, 185, 207, 9, 50, 130, 184, 252, 155, 24,
53, 144, 172, 170, 88, 51, 1, 176, 173, 17, 40, 115, 129, 136, 200, 11, 70, ; 53, 144, 172, 170, 88, 51, 1, 176, 173, 17, 40, 115, 129, 136, 200, 11, 70,
129, 8, 0, 0, 48, 37, 160, 42, 35, 32, 17, 18, 220, 174, 170, 143, 9, 137, 160, ; 129, 8, 0, 0, 48, 37, 160, 42, 35, 32, 17, 18, 220, 174, 170, 143, 9, 137, 160,
171, 104, 4, 169, 154, 219, 142, 65, 129, 128, 168, 9, 69, 50, 130, 219, 128, ; 171, 104, 4, 169, 154, 219, 142, 65, 129, 128, 168, 9, 69, 50, 130, 219, 128,
138, 49, 52, 146, 237, 141, 50, 21, 8, 136, 8, 153, 35, 193, 170, 2, 169, 224, ; 138, 49, 52, 146, 237, 141, 50, 21, 8, 136, 8, 153, 35, 193, 170, 2, 169, 224,
186, 170, 40, 253, 12, 17, 25] ; 186, 170, 40, 253, 12, 17, 25]
pcm_data:
%asmbinary "pcm-mono.bin"
pcm_data_end:
} }