Apple-2-SW/prog8
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prog8/examples/cx16/pcmaudio/vumeter.p8

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%import diskio
%import sprites
%option no_sysinit
; play a raw pcm stereo 16 bit audio file at 16021 hz,
; with real-time VU meters and sample waveform displays.
; you can make an appropriate pcm file with one of the following commands:
; ffmpeg -i input_audio_file -ac 2 -ar 16021 -f s16le -acodec pcm_s16le music.pcm
; sox input_audio_file -e signed-integer -L -b 16 -c 2 -r 16021 -t raw music.pcm
main {
const ubyte vera_rate = 42 ; 16021 hz
str pcmfile = "music.pcm" ; see format specs mentioned above
sub start() {
setup()
play_stuff()
repeat {}
}
sub setup() {
void cx16.screen_mode(128, false)
cx16.GRAPH_set_colors(0,0,0)
cx16.GRAPH_clear()
cx16.GRAPH_set_colors(6,0,0)
cx16.r0 = 250
cx16.r1 = 10
for cx16.r9L in iso:"made in Prog8"
cx16.GRAPH_put_next_char(cx16.r9L)
cx16.r0 = 250
cx16.r1 = 20
for cx16.r9L in iso:"16kHz stereo"
cx16.GRAPH_put_next_char(cx16.r9L)
cx16.rombank(0) ; activate kernal bank for faster calls
void diskio.fastmode(1)
cx16.VERA_AUDIO_RATE = 0 ; halt playback
cx16.VERA_AUDIO_CTRL = %10111100 ; stereo 16 bit, volume 12
repeat 1024
cx16.VERA_AUDIO_DATA = 0 ; fill buffer with short silence
; clear vu meter to base values
update_vu()
; draw the vu gradient bars (20 leds each)
; They use palette colors 16 and up, in pairs. Left bar first (16-55) then right bar (56-95).
for cx16.r9L in 0 to 19 {
cx16.GRAPH_set_colors(16+cx16.r9L*2, 17+cx16.r9L*2, 0)
cx16.GRAPH_draw_rect(160-32-16, 220-8-cx16.r9L*8, 32, 7, 0, true)
cx16.GRAPH_set_colors(56+cx16.r9L*2, 57+cx16.r9L*2, 0)
cx16.GRAPH_draw_rect(160+32-16, 220-8-cx16.r9L*8, 32, 7, 0, true)
}
; waveform sprites 32x64
sprites.init(16, 1, $3400, sprites.SIZE_32, sprites.SIZE_64, sprites.COLORS_16, 0)
sprites.init(17, 1, $3800, sprites.SIZE_32, sprites.SIZE_64, sprites.COLORS_16, 0)
for cx16.r9 in $3400 to $3400+32*64/2 {
cx16.vpoke(1, cx16.r9, 0)
cx16.vpoke(1, cx16.r9+$0400, 0)
}
sprites.pos(16, 160-100-16, 100)
sprites.pos(17, 160+100-16, 100)
; activate irq handlers
cx16.enable_irq_handlers(true)
cx16.set_aflow_irq_handler(interrupts.aflow_handler)
cx16.set_vsync_irq_handler(interrupts.vsync_handler)
}
sub play_stuff() {
if diskio.f_open(pcmfile) {
bool streaming = true
music.pre_buffer()
cx16.VERA_AUDIO_RATE = vera_rate ; start audio playback
repeat {
interrupts.wait()
if interrupts.vsync {
interrupts.vsync=false
update_visuals()
}
if interrupts.aflow {
interrupts.aflow=false
if streaming {
streaming = music.load_next_block()
if not streaming {
cx16.VERA_AUDIO_RATE = 0 ; halt playback
diskio.f_close()
sys.memset(music.buffer, music.PCM_BLOCK_SIZE, 0)
}
}
; Note: copying the samples into the fifo buffer is done by the aflow interrupt handler itself.
collect_audio_volumes()
}
}
} else {
txt.print("load error\n")
}
cx16.VERA_AUDIO_RATE = 0 ; halt playback
}
uword @zp current_vol_left, current_vol_right
uword avg_vol_left, avg_vol_right
ubyte peak_left, peak_right
ubyte vu_refresh_ticks = 2
ubyte peak_falloff_ticks_left = 2
ubyte peak_falloff_ticks_right = 2
ubyte peak_stick_delay_left
ubyte peak_stick_delay_right
sub collect_audio_volumes() {
current_vol_left = current_vol_right = 0
uword @zp buf_ptr = music.buffer + 1
sys.set_irqd()
repeat music.PCM_BLOCK_SIZE/2/2 {
current_vol_left += scale[abs(@(buf_ptr) as byte)]
buf_ptr+=2
current_vol_right += scale[abs(@(buf_ptr) as byte)]
buf_ptr+=2
}
sys.clear_irqd()
; logarithmic volume scale ln(x/20+1)*97
ubyte[256] scale = [
0, 4, 9, 13, 17, 21, 25, 29, 32, 36, 39, 42, 45, 48, 51, 54, 57, 59, 62, 64, 67, 69, 71, 74, 76,
78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 99, 101, 103, 104, 106, 108, 109, 111, 112, 114, 115,
117, 118, 120, 121, 122, 124, 125, 126, 128, 129, 130, 132, 133, 134, 135, 136, 138, 139, 140, 141,
142, 143, 144, 145, 146, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 158, 159, 160, 161,
162, 163, 164, 165, 166, 167, 167, 168, 169, 170, 171, 172, 172, 173, 174, 175, 176, 176, 177, 178,
179, 180, 180, 181, 182, 183, 183, 184, 185, 185, 186, 187, 188, 188, 189, 190, 190, 191, 192, 192,
193, 194, 194, 195, 196, 196, 197, 197, 198, 199, 199, 200, 201, 201, 202, 202, 203, 204, 204, 205,
205, 206, 207, 207, 208, 208, 209, 209, 210, 210, 211, 212, 212, 213, 213, 214, 214, 215, 215, 216,
216, 217, 217, 218, 218, 219, 219, 220, 220, 221, 221, 222, 222, 223, 223, 224, 224, 225, 225, 226,
226, 227, 227, 228, 228, 229, 229, 229, 230, 230, 231, 231, 232, 232, 233, 233, 233, 234, 234, 235,
235, 236, 236, 236, 237, 237, 238, 238, 238, 239, 239, 240, 240, 241, 241, 241, 242, 242, 243, 243,
243, 244, 244, 244, 245, 245, 246, 246, 246, 247, 247, 248, 248, 248, 249, 249, 249, 250, 250, 251,
251, 251, 252, 252, 252, 253, 253, 253, 254]
}
sub update_visuals() {
vu_refresh_ticks--
if_z {
vu_refresh_ticks = 2
update_vu()
avg_vol_left = avg_vol_right = 0
} else {
avg_vol_left += current_vol_left
avg_vol_right += current_vol_right
}
uword @zp sample_ptr = music.buffer
cx16.vaddr(1,$3400,0,1)
repeat 64 {
sample_line()
sample_ptr+=8 ; should be 16 to cover whole buffer, but this looks nicer
}
cx16.vaddr(1,$3800,0,1)
sample_ptr = music.buffer+2
repeat 64 {
sample_line()
sample_ptr+=8 ; should be 16 to cover whole buffer, but this looks nicer
}
sub sample_line() {
cx16.r0L = @(sample_ptr+1) >> 3 ; value 0 - 31
%asm {{
ldy cx16.r0L
lda p8v_sample_sprite_tab_0,y
sta cx16.VERA_DATA0
lda p8v_sample_sprite_tab_1,y
sta cx16.VERA_DATA0
lda p8v_sample_sprite_tab_2,y
sta cx16.VERA_DATA0
lda p8v_sample_sprite_tab_3,y
sta cx16.VERA_DATA0
lda p8v_sample_sprite_tab_4,y
sta cx16.VERA_DATA0
lda p8v_sample_sprite_tab_5,y
sta cx16.VERA_DATA0
lda p8v_sample_sprite_tab_6,y
sta cx16.VERA_DATA0
lda p8v_sample_sprite_tab_7,y
sta cx16.VERA_DATA0
lda p8v_sample_sprite_tab_8,y
sta cx16.VERA_DATA0
lda p8v_sample_sprite_tab_9,y
sta cx16.VERA_DATA0
lda p8v_sample_sprite_tab_a,y
sta cx16.VERA_DATA0
lda p8v_sample_sprite_tab_b,y
sta cx16.VERA_DATA0
lda p8v_sample_sprite_tab_c,y
sta cx16.VERA_DATA0
lda p8v_sample_sprite_tab_d,y
sta cx16.VERA_DATA0
lda p8v_sample_sprite_tab_e,y
sta cx16.VERA_DATA0
lda p8v_sample_sprite_tab_f,y
sta cx16.VERA_DATA0
}}
; cx16.VERA_DATA0 = sample_sprite_tab_0[cx16.r0L]
; cx16.VERA_DATA0 = sample_sprite_tab_1[cx16.r0L]
; cx16.VERA_DATA0 = sample_sprite_tab_2[cx16.r0L]
; cx16.VERA_DATA0 = sample_sprite_tab_3[cx16.r0L]
; cx16.VERA_DATA0 = sample_sprite_tab_4[cx16.r0L]
; cx16.VERA_DATA0 = sample_sprite_tab_5[cx16.r0L]
; cx16.VERA_DATA0 = sample_sprite_tab_6[cx16.r0L]
; cx16.VERA_DATA0 = sample_sprite_tab_7[cx16.r0L]
; cx16.VERA_DATA0 = sample_sprite_tab_8[cx16.r0L]
; cx16.VERA_DATA0 = sample_sprite_tab_9[cx16.r0L]
; cx16.VERA_DATA0 = sample_sprite_tab_a[cx16.r0L]
; cx16.VERA_DATA0 = sample_sprite_tab_b[cx16.r0L]
; cx16.VERA_DATA0 = sample_sprite_tab_c[cx16.r0L]
; cx16.VERA_DATA0 = sample_sprite_tab_d[cx16.r0L]
; cx16.VERA_DATA0 = sample_sprite_tab_e[cx16.r0L]
; cx16.VERA_DATA0 = sample_sprite_tab_f[cx16.r0L]
ubyte[32] sample_sprite_tab_0 = [$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00, $1c,$01,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00]
ubyte[32] sample_sprite_tab_1 = [$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00, $00,$c0,$1c,$01,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00]
ubyte[32] sample_sprite_tab_2 = [$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00, $00,$00,$00,$c0,$1c,$01,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00]
ubyte[32] sample_sprite_tab_3 = [$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00, $00,$00,$00,$00,$00,$c0,$1c,$01,$00,$00,$00,$00,$00,$00,$00,$00]
ubyte[32] sample_sprite_tab_4 = [$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00, $00,$00,$00,$00,$00,$00,$00,$c0,$1c,$01,$00,$00,$00,$00,$00,$00]
ubyte[32] sample_sprite_tab_5 = [$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00, $00,$00,$00,$00,$00,$00,$00,$00,$00,$c0,$1c,$01,$00,$00,$00,$00]
ubyte[32] sample_sprite_tab_6 = [$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00, $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$c0,$1c,$01,$00,$00]
ubyte[32] sample_sprite_tab_7 = [$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00, $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$c0,$1c,$01]
ubyte[32] sample_sprite_tab_8 = [$1c,$01,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00, $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00]
ubyte[32] sample_sprite_tab_9 = [$00,$c0,$1c,$01,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00, $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00]
ubyte[32] sample_sprite_tab_a = [$00,$00,$00,$c0,$1c,$01,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00, $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00]
ubyte[32] sample_sprite_tab_b = [$00,$00,$00,$00,$00,$c0,$1c,$01,$00,$00,$00,$00,$00,$00,$00,$00, $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00]
ubyte[32] sample_sprite_tab_c = [$00,$00,$00,$00,$00,$00,$00,$c0,$1c,$01,$00,$00,$00,$00,$00,$00, $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00]
ubyte[32] sample_sprite_tab_d = [$00,$00,$00,$00,$00,$00,$00,$00,$00,$c0,$1c,$01,$00,$00,$00,$00, $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00]
ubyte[32] sample_sprite_tab_e = [$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$c0,$1c,$01,$00,$00, $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00]
ubyte[32] sample_sprite_tab_f = [$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$c0,$1c,$01, $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00]
}
}
sub update_vu() {
; determine vu 'level' in steps of 8 pixels, on a scale of 0-19
ubyte aleft = min(143, msb(avg_vol_left))
ubyte aright = min(143, msb(avg_vol_right))
aleft = (aleft >> 3) + 2
aright = (aright >> 3) + 2
set_inactive_leds()
set_peak_indicator()
set_active_leds()
sub set_inactive_leds() {
ubyte level
for level in aleft*4 to 19*4 step 4 {
set_led_colors(16*2+level, 20)
}
for level in aright*4 to 19*4 step 4 {
set_led_colors(56*2+level, 20)
}
}
sub set_active_leds() {
do {
aleft--
set_led_colors((16+aleft*2)*2, aleft)
} until aleft==0
do {
aright--
set_led_colors((56+aright*2)*2, aright)
} until aright==0
}
sub set_peak_indicator() {
peak_stick_delay_left--
if_z {
peak_stick_delay_left = 1
peak_falloff_ticks_left--
if_z {
peak_falloff_ticks_left = 2
if peak_left!=0
peak_left--
}
}
peak_stick_delay_right--
if_z {
peak_stick_delay_right = 1
peak_falloff_ticks_right--
if_z {
peak_falloff_ticks_right = 2
if peak_right!=0
peak_right--
}
}
if aleft>peak_left {
peak_stick_delay_left = 15
peak_left = aleft
}
if aright>peak_right {
peak_stick_delay_right = 15
peak_right = aright
}
set_led_colors(16*2+peak_left*4, 21)
set_led_colors(56*2+peak_right*4, 21)
}
sub set_led_colors(ubyte palette_offset, ubyte color_idx) {
cx16.vaddr(1, $fa00+palette_offset, 0, 1)
uword @zp outline_rgb = outline_color[color_idx]
uword @zp fill_rgb = fill_color[color_idx]
cx16.VERA_DATA0 = lsb(outline_rgb)
cx16.VERA_DATA0 = msb(outline_rgb)
cx16.VERA_DATA0 = lsb(fill_rgb)
cx16.VERA_DATA0 = msb(fill_rgb)
}
uword[22] @split outline_color = [$090,$190,$290,$390,$490,$590,$690,$790,$990,$980,$970,$960,$950,$940,$a30,$a00,$a00,$a00,$a00,$a00, $111, $148]
uword[22] @split fill_color = [$0f0,$2f0,$4f0,$6f0,$8f0,$af0,$cf0,$ef0,$ff0,$fe0,$fc0,$fa0,$f80,$f60,$f40,$f00,$f01,$f02,$f03,$f04, $000, $28f]
}
}
interrupts {
bool aflow
bool vsync
inline asmsub wait() {
%asm {{
wai
}}
}
sub aflow_handler() -> bool {
; Filling the fifo is the only way to clear the Aflow irq.
; So we do this here, otherwise the aflow irq will keep triggering.
; Note that filling the buffer with fresh audio samples is NOT done here,
; but instead in the main program code that triggers on the 'aflow' being true!
cx16.save_virtual_registers()
music.fill_fifo()
cx16.restore_virtual_registers()
aflow = true
return false
}
sub vsync_handler() -> bool {
vsync = true
return false
}
}
music {
const uword PCM_BLOCK_SIZE = 1024 ; must be power of 2
uword buffer = memory("buffer", PCM_BLOCK_SIZE, 256)
sub pre_buffer() {
; pre-buffer first block
void diskio.f_read(buffer, PCM_BLOCK_SIZE)
}
sub load_next_block() -> bool {
; read next block from disk into the buffer, for next time the irq triggers
return diskio.f_read(buffer, PCM_BLOCK_SIZE) == PCM_BLOCK_SIZE
}
asmsub fill_fifo() {
; optimized loop to put <block_size> bytes of data into the fifo as fast as possible
%asm {{
lda p8v_buffer
sta cx16.r0L
lda p8v_buffer+1
sta cx16.r0H
ldx #(p8c_PCM_BLOCK_SIZE>>8)
- ldy #0
- lda (cx16.r0),y
sta cx16.VERA_AUDIO_DATA
iny
bne -
inc cx16.r0H
dex
bne --
rts
}}
; original prog8 code:
; uword @requirezp ptr = main.start.buffer
; repeat PCM_BLOCK_SIZE {
; cx16.VERA_AUDIO_DATA = @(ptr)
; ptr++
; }
}
}
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