mirror of https://github.com/irmen/prog8.git
added cx16/vumeter example
This commit is contained in:
Irmen de Jong
parent
d8ec03874f
commit
94263c43d0
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@ -108,6 +108,7 @@ class TestCompilerOnExamplesCx16: FunSpec({
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"vtui/testvtui",
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"pcmaudio/play-adpcm",
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"pcmaudio/stream-wav",
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"pcmaudio/vumeter",
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"sprites/dragon",
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"sprites/dragons",
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"amiga",
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@ -0,0 +1,313 @@
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%import diskio
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%import palette
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%import sprites
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%option no_sysinit
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; play a raw pcm stereo 16 bit audio file at 16021 hz,
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; with real-time VU meters and sample waveform displays.
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; TODO add peak level indicator
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; TODO nicer color gradient for the bars
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main {
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const ubyte vera_rate = 42 ; 16021 hz
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str pcmfile = "thriller-16k.pcm"
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sub start() {
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setup()
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play_stuff()
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}
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sub setup() {
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void cx16.screen_mode(128, false)
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cx16.GRAPH_set_colors(0,0,0)
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cx16.GRAPH_clear()
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cx16.rombank(0) ; activate kernal bank for faster calls
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void diskio.fastmode(1)
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cx16.VERA_AUDIO_RATE = 0 ; halt playback
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cx16.VERA_AUDIO_CTRL = %10111100 ; stereo 16 bit, volume 12
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repeat 1024
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cx16.VERA_AUDIO_DATA = 0 ; fill buffer with short silence
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; vu bar sprites (left and right bars, each 4 sprites)
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palette.set_color(15, $000) ; make sprites black
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for cx16.r9L in 0 to 7 {
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sprites.init(cx16.r9L, 1, $3000, sprites.SIZE_32, sprites.SIZE_64, sprites.COLORS_16, 0)
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}
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for cx16.r9 in $3000 to $3000+32*64/2 {
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cx16.vpoke(1, cx16.r9, $ff)
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}
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update_vu()
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; draw vu gradient
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for cx16.r9L in 239 downto 80 {
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cx16.GRAPH_set_colors(cx16.r9L, 1, 2)
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cx16.GRAPH_draw_line(160-32-16, cx16.r9L, 160-32+15, cx16.r9L)
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cx16.GRAPH_draw_line(160+32-16, cx16.r9L, 160+32+15, cx16.r9L)
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}
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; waveform sprites 32x64
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sprites.init(16, 1, $3400, sprites.SIZE_32, sprites.SIZE_64, sprites.COLORS_16, 0)
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sprites.init(17, 1, $3800, sprites.SIZE_32, sprites.SIZE_64, sprites.COLORS_16, 0)
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for cx16.r9 in $3400 to $3400+32*64/2 {
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cx16.vpoke(1, cx16.r9, 0)
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cx16.vpoke(1, cx16.r9+$0400, 0)
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}
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sprites.pos(16, 160-100-16, 120)
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sprites.pos(17, 160+100-16, 120)
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; irq handlers
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cx16.enable_irq_handlers(true)
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cx16.set_aflow_irq_handler(interrupts.aflow_handler)
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cx16.set_vsync_irq_handler(interrupts.vsync_handler)
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}
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sub play_stuff() {
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if diskio.f_open(pcmfile) {
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music.pre_buffer()
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cx16.VERA_AUDIO_RATE = vera_rate ; start audio playback
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repeat {
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interrupts.wait()
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if interrupts.vsync {
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interrupts.vsync=false
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update_visuals()
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}
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if interrupts.aflow {
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interrupts.aflow=false
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if not music.load_next_block()
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break
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; Note: copying the samples into the fifo buffer is done by the aflow interrupt handler itself.
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collect_audio_volumes()
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}
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}
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diskio.f_close()
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} else {
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txt.print("load error\n")
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}
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cx16.VERA_AUDIO_RATE = 0 ; halt playback
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}
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uword @zp current_vol_left
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uword @zp current_vol_right
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uword avg_vol_left
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uword avg_vol_right
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ubyte vu_refresh_ticks = 2
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sub collect_audio_volumes() {
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current_vol_left=0
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current_vol_right=0
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uword @zp buf_ptr = music.buffer + 1
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sys.set_irqd()
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repeat music.PCM_BLOCK_SIZE/2/2 {
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current_vol_left += scale[abs(@(buf_ptr) as byte)]
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buf_ptr+=2
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current_vol_right += scale[abs(@(buf_ptr) as byte)]
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buf_ptr+=2
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}
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sys.clear_irqd()
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; logarithmic volume scale ln(x/20+1)*97
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ubyte[256] scale = [
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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,
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78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 99, 101, 103, 104, 106, 108, 109, 111, 112, 114, 115,
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117, 118, 120, 121, 122, 124, 125, 126, 128, 129, 130, 132, 133, 134, 135, 136, 138, 139, 140, 141,
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142, 143, 144, 145, 146, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 158, 159, 160, 161,
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162, 163, 164, 165, 166, 167, 167, 168, 169, 170, 171, 172, 172, 173, 174, 175, 176, 176, 177, 178,
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179, 180, 180, 181, 182, 183, 183, 184, 185, 185, 186, 187, 188, 188, 189, 190, 190, 191, 192, 192,
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193, 194, 194, 195, 196, 196, 197, 197, 198, 199, 199, 200, 201, 201, 202, 202, 203, 204, 204, 205,
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205, 206, 207, 207, 208, 208, 209, 209, 210, 210, 211, 212, 212, 213, 213, 214, 214, 215, 215, 216,
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216, 217, 217, 218, 218, 219, 219, 220, 220, 221, 221, 222, 222, 223, 223, 224, 224, 225, 225, 226,
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226, 227, 227, 228, 228, 229, 229, 229, 230, 230, 231, 231, 232, 232, 233, 233, 233, 234, 234, 235,
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235, 236, 236, 236, 237, 237, 238, 238, 238, 239, 239, 240, 240, 241, 241, 241, 242, 242, 243, 243,
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243, 244, 244, 244, 245, 245, 246, 246, 246, 247, 247, 248, 248, 248, 249, 249, 249, 250, 250, 251,
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251, 251, 252, 252, 252, 253, 253, 253, 254]
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}
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sub update_visuals() {
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vu_refresh_ticks--
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if_z {
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vu_refresh_ticks = 2
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update_vu()
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avg_vol_left = 0
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avg_vol_right = 0
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} else {
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avg_vol_left += current_vol_left
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avg_vol_right += current_vol_right
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}
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uword sample_ptr = music.buffer
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cx16.vaddr(1,$3400,0,1)
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repeat 64 {
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sample_line()
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sample_ptr+=8 ; should be 16 to cover whole buffer, but this looks nicer
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}
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cx16.vaddr(1,$3800,0,1)
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sample_ptr = music.buffer+2
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repeat 64 {
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sample_line()
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sample_ptr+=8 ; should be 16 to cover whole buffer, but this looks nicer
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}
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sub sample_line() {
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cx16.r0L = @(sample_ptr+1) >> 3 ; value 0 - 31
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%asm {{
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ldy cx16.r0L
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lda p8v_sample_sprite_tab_0,y
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sta cx16.VERA_DATA0
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lda p8v_sample_sprite_tab_1,y
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sta cx16.VERA_DATA0
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lda p8v_sample_sprite_tab_2,y
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sta cx16.VERA_DATA0
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lda p8v_sample_sprite_tab_3,y
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sta cx16.VERA_DATA0
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lda p8v_sample_sprite_tab_4,y
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sta cx16.VERA_DATA0
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lda p8v_sample_sprite_tab_5,y
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sta cx16.VERA_DATA0
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lda p8v_sample_sprite_tab_6,y
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sta cx16.VERA_DATA0
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lda p8v_sample_sprite_tab_7,y
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sta cx16.VERA_DATA0
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lda p8v_sample_sprite_tab_8,y
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sta cx16.VERA_DATA0
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lda p8v_sample_sprite_tab_9,y
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sta cx16.VERA_DATA0
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lda p8v_sample_sprite_tab_a,y
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sta cx16.VERA_DATA0
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lda p8v_sample_sprite_tab_b,y
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sta cx16.VERA_DATA0
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lda p8v_sample_sprite_tab_c,y
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sta cx16.VERA_DATA0
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lda p8v_sample_sprite_tab_d,y
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sta cx16.VERA_DATA0
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lda p8v_sample_sprite_tab_e,y
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sta cx16.VERA_DATA0
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lda p8v_sample_sprite_tab_f,y
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sta cx16.VERA_DATA0
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}}
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; cx16.VERA_DATA0 = sample_sprite_tab_0[cx16.r0L]
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; cx16.VERA_DATA0 = sample_sprite_tab_1[cx16.r0L]
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; cx16.VERA_DATA0 = sample_sprite_tab_2[cx16.r0L]
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; cx16.VERA_DATA0 = sample_sprite_tab_3[cx16.r0L]
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; cx16.VERA_DATA0 = sample_sprite_tab_4[cx16.r0L]
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; cx16.VERA_DATA0 = sample_sprite_tab_5[cx16.r0L]
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; cx16.VERA_DATA0 = sample_sprite_tab_6[cx16.r0L]
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; cx16.VERA_DATA0 = sample_sprite_tab_7[cx16.r0L]
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; cx16.VERA_DATA0 = sample_sprite_tab_8[cx16.r0L]
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; cx16.VERA_DATA0 = sample_sprite_tab_9[cx16.r0L]
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; cx16.VERA_DATA0 = sample_sprite_tab_a[cx16.r0L]
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; cx16.VERA_DATA0 = sample_sprite_tab_b[cx16.r0L]
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; cx16.VERA_DATA0 = sample_sprite_tab_c[cx16.r0L]
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; cx16.VERA_DATA0 = sample_sprite_tab_d[cx16.r0L]
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; cx16.VERA_DATA0 = sample_sprite_tab_e[cx16.r0L]
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; cx16.VERA_DATA0 = sample_sprite_tab_f[cx16.r0L]
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ubyte[32] sample_sprite_tab_0 = [$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00, $10,$01,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00]
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ubyte[32] sample_sprite_tab_1 = [$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00, $00,$00,$10,$01,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00]
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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,$00,$10,$01,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00]
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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,$00,$01,$01,$00,$00,$00,$00,$00,$00,$00,$00]
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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,$00,$10,$01,$00,$00,$00,$00,$00,$00]
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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,$00,$10,$01,$00,$00,$00,$00]
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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,$00,$10,$01,$00,$00]
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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,$00,$10,$01]
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ubyte[32] sample_sprite_tab_8 = [$10,$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]
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ubyte[32] sample_sprite_tab_9 = [$00,$00,$10,$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]
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ubyte[32] sample_sprite_tab_a = [$00,$00,$00,$00,$10,$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]
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ubyte[32] sample_sprite_tab_b = [$00,$00,$00,$00,$00,$00,$10,$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]
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ubyte[32] sample_sprite_tab_c = [$00,$00,$00,$00,$00,$00,$00,$00,$10,$01,$00,$00,$00,$00,$00,$00, $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00]
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ubyte[32] sample_sprite_tab_d = [$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$10,$01,$00,$00,$00,$00, $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00]
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ubyte[32] sample_sprite_tab_e = [$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$10,$01,$00,$00, $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00]
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ubyte[32] sample_sprite_tab_f = [$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$10,$10, $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00]
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}
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}
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sub update_vu() {
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word aleft = $00a0 as word - msb(avg_vol_left)
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word aright = $00a0 as word - msb(avg_vol_right)
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for cx16.r9L in 0 to 3 {
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; note: sprites overlap a bit to avoid scanlines peeping through when updating outside of vblank
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sprites.pos(cx16.r9L, 160-32-16, aleft)
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sprites.pos(4+cx16.r9L, 160+32-16, aright)
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aleft -= 32
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aright -= 32
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}
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}
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}
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interrupts {
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bool aflow
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bool vsync
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asmsub wait() {
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%asm {{
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wai
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}}
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}
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sub aflow_handler() -> bool {
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; Filling the fifo is the only way to clear the Aflow irq.
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; So we do this here, otherwise the aflow irq will keep triggering.
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; Note that filling the buffer with fresh audio samples is NOT done here,
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; but instead in the main program code that triggers on the 'aflow' being true!
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cx16.save_virtual_registers()
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music.fill_fifo()
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cx16.restore_virtual_registers()
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aflow = true
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return false
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}
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sub vsync_handler() -> bool {
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vsync = true
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return false
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}
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}
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music {
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const uword PCM_BLOCK_SIZE = 1024 ; must be power of 2
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uword buffer = memory("buffer", PCM_BLOCK_SIZE, 256)
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sub pre_buffer() {
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; pre-buffer first block
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void diskio.f_read(buffer, PCM_BLOCK_SIZE)
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}
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sub load_next_block() -> bool {
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; read next block from disk into the buffer, for next time the irq triggers
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return diskio.f_read(buffer, PCM_BLOCK_SIZE) == PCM_BLOCK_SIZE
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}
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asmsub fill_fifo() {
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; optimized loop to put <block_size> bytes of data into the fifo as fast as possible
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%asm {{
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lda p8v_buffer
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sta cx16.r0L
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lda p8v_buffer+1
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sta cx16.r0H
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ldx #(p8c_PCM_BLOCK_SIZE>>8)
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- ldy #0
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- lda (cx16.r0),y
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sta cx16.VERA_AUDIO_DATA
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iny
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bne -
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inc cx16.r0H
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dex
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bne --
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rts
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}}
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; original prog8 code:
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; uword @requirezp ptr = main.start.buffer
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; repeat 1024 {
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; cx16.VERA_AUDIO_DATA = @(ptr)
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; ptr++
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; }
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}
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}
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