mirror of
https://github.com/irmen/prog8.git
synced 2024-10-01 07:55:51 +00:00
198 lines
6.5 KiB
Lua
198 lines
6.5 KiB
Lua
%import textio
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%option no_sysinit
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%zeropage basicsafe
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main {
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sub start() {
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cx16.VERA_AUDIO_CTRL = %10101111 ; mono 16 bit
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cx16.VERA_AUDIO_RATE = 0 ; halt playback
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cx16.VERA_IEN &= %11110111 ; disable AFLOW
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repeat 4096 {
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cx16.VERA_AUDIO_DATA = 0
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}
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cx16.VERA_AUDIO_RATE = 16
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uword pcm_size = &pcm_data_end - &pcm_data
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uword num_blocks = pcm_size / 1024
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uword pcm_ptr = &pcm_data
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txt.print("audio on.\n")
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repeat num_blocks {
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; wait till the fifo is empty (fully empty??)
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while not (cx16.VERA_AUDIO_CTRL & %01000000) {
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; wait
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}
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; fill more audio data
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repeat 512 {
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cx16.VERA_AUDIO_DATA = @(pcm_ptr)
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pcm_ptr++
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cx16.VERA_AUDIO_DATA = @(pcm_ptr)
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pcm_ptr++
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}
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}
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cx16.VERA_AUDIO_CTRL = %00100000
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cx16.VERA_AUDIO_RATE = 0
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txt.print("audio off.\n")
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; uword adpcm_size = &adpcm_data_end - &adpcm_data
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; uword num_adpcm_blocks = adpcm_size / 256
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; uword nibblesptr = &adpcm_data
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;
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; nibblesptr = &nibbles
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; repeat num_adpcm_blocks {
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; ; wait till the fifo is empty (fully empty??)
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; while not (cx16.VERA_AUDIO_CTRL & %01000000) {
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; ; wait
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; }
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;
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; ; decode another adpcm block
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; uword @zp sample = peekw(nibblesptr)
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; nibblesptr += 2
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; adpcm.init(sample, @(nibblesptr))
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; nibblesptr += 2
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;
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; repeat 252 {
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; ubyte @zp nibble = @(nibblesptr)
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; adpcm.decode_nibble(nibble & 15)
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; ; adpcm.predict as word
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; cx16.VERA_AUDIO_DATA = lsb(adpcm.predict)
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; cx16.VERA_AUDIO_DATA = msb(adpcm.predict)
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; adpcm.decode_nibble(nibble>>4)
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; ; adpcm.predict as word
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; cx16.VERA_AUDIO_DATA = lsb(adpcm.predict)
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; cx16.VERA_AUDIO_DATA = msb(adpcm.predict)
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; nibblesptr++
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; }
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; }
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; cx16.set_rasterirq(irqhandler, 10)
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; uword adpcm_size = &adpcm_data_end - &adpcm_data
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; uword num_adpcm_blocks = adpcm_size / 256
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; uword nibblesptr = &adpcm_data
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;
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; num_adpcm_blocks = 1
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; nibblesptr = &nibbles
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;
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; repeat num_adpcm_blocks {
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; uword @zp sample = peekw(nibblesptr)
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; nibblesptr += 2
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; adpcm.init(sample, @(nibblesptr))
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; nibblesptr += 2
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;
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; repeat 252 {
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; ubyte @zp nibble = @(nibblesptr)
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; adpcm.decode_nibble(nibble & 15)
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; txt.print_w(adpcm.predict as word)
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; txt.spc()
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; adpcm.decode_nibble(nibble>>4)
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; txt.print_w(adpcm.predict as word)
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; txt.spc()
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; nibblesptr++
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; }
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; }
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}
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; sub irqhandler() {
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; cx16.vpoke(1, $fa00, 255)
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;
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; uword @zp sample = peekw(nibbles)
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; adpcm.init(sample, nibbles[2])
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;
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; ubyte @zp idx = 4
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; while idx<200 {
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; ubyte @zp nibble = nibbles[idx]
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; adpcm.decode_nibble(nibble & 15)
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; sample = adpcm.predict
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; nibble >>= 4
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; adpcm.decode_nibble(nibble)
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; sample = adpcm.predict
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; idx++
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; }
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;
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; cx16.vpoke(1, $fa00,0)
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; }
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;adpcm_data:
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; %asmbinary "adpcm-mono.bin"
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;adpcm_data_end:
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; ubyte[256] nibbles = [216, 227, 59, 0, 32, 2, 186, 139, 24, 34, 84, 115, 19, 185, 173, 8, 0, 56, 162,
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; 169, 144, 113, 55, 130, 186, 12, 33, 144, 10, 136, 10, 129, 41, 66, 210, 207,
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; 9, 0, 153, 129, 185, 173, 155, 0, 37, 162, 191, 27, 36, 129, 144, 137, 82, 18,
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; 87, 18, 152, 153, 136, 0, 32, 23, 0, 40, 24, 117, 19, 202, 138, 8, 176, 171,
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; 24, 131, 234, 9, 32, 39, 160, 10, 153, 33, 52, 209, 137, 200, 73, 33, 233, 155,
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; 136, 66, 146, 8, 152, 56, 131, 113, 23, 168, 169, 185, 9, 160, 65, 37, 49, 22,
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; 64, 68, 168, 138, 153, 1, 171, 88, 35, 25, 65, 1, 176, 173, 185, 175, 168, 154,
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; 153, 205, 138, 144, 152, 154, 204, 43, 53, 51, 35, 154, 184, 96, 71, 34, 152,
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; 172, 138, 160, 9, 24, 16, 204, 88, 48, 54, 160, 172, 152, 65, 132, 168, 48, 4,
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; 0, 190, 9, 161, 155, 218, 139, 154, 185, 207, 9, 50, 130, 184, 252, 155, 24,
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; 53, 144, 172, 170, 88, 51, 1, 176, 173, 17, 40, 115, 129, 136, 200, 11, 70,
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; 129, 8, 0, 0, 48, 37, 160, 42, 35, 32, 17, 18, 220, 174, 170, 143, 9, 137, 160,
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; 171, 104, 4, 169, 154, 219, 142, 65, 129, 128, 168, 9, 69, 50, 130, 219, 128,
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; 138, 49, 52, 146, 237, 141, 50, 21, 8, 136, 8, 153, 35, 193, 170, 2, 169, 224,
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; 186, 170, 40, 253, 12, 17, 25]
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pcm_data:
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%asmbinary "pcm-mono.bin"
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pcm_data_end:
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}
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adpcm {
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ubyte[] t_index = [ -1, -1, -1, -1, 2, 4, 6, 8, -1, -1, -1, -1, 2, 4, 6, 8]
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uword[] t_step = [
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7, 8, 9, 10, 11, 12, 13, 14,
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16, 17, 19, 21, 23, 25, 28, 31,
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34, 37, 41, 45, 50, 55, 60, 66,
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73, 80, 88, 97, 107, 118, 130, 143,
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157, 173, 190, 209, 230, 253, 279, 307,
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337, 371, 408, 449, 494, 544, 598, 658,
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724, 796, 876, 963, 1060, 1166, 1282, 1411,
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1552, 1707, 1878, 2066, 2272, 2499, 2749, 3024,
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3327, 3660, 4026, 4428, 4871, 5358, 5894, 6484,
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7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
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15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794,
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32767]
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uword @zp predict
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ubyte @zp index
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uword @zp pstep
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sub init(uword startPredict, ubyte startIndex) {
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predict = startPredict
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index = startIndex
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pstep = t_step[index]
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}
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sub decode_nibble(ubyte nibble) {
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word @zp difference = 0
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if nibble & 4
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difference += pstep
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pstep >>= 1
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if nibble & 2
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difference += pstep
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pstep >>= 1
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if nibble & 1
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difference += pstep
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pstep >>= 1
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difference += pstep
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if nibble & 8
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difference = -difference
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predict += difference as uword
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index += t_index[nibble]
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if index & 128
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index = 0
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else if index > 88
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index = 88
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pstep = t_step[index]
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}
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}
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