mirror of
https://github.com/irmen/prog8.git
synced 2024-11-26 11:49:22 +00:00
beaff4d650
This makes the naming consistent with the other cbm-like targets (c64, pet, c128). Only the x16 specific ones remain in the cx16 namespace, such as cx16.KEYHDL Probably the most impactful is the move of cx16.CINV to cbm.CINV
323 lines
10 KiB
Lua
323 lines
10 KiB
Lua
%import textio
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%import floats
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%import wavfile
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%import adpcm
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%option no_sysinit
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%zeropage basicsafe
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;
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; Simple IMA ADPCM playback example. (factor 4 lossy compressed pcm audio)
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;
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; NOTE: this program requires 16 bits MONO or STEREO audio, and 256 byte encoded block size!
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; HOW TO CREATE SUCH IMA-ADPCM ENCODED AUDIO? Use sox or ffmpeg:
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; $ sox --guard source.mp3 -r 8000 -c 1 -e ima-adpcm out.wav trim 01:27.50 00:09
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; $ ffmpeg -i source.mp3 -ss 00:01:27.50 -to 00:01:36.50 -ar 8000 -ac 1 -c:a adpcm_ima_wav -block_size 256 -map_metadata -1 -bitexact out.wav
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; Or use a tool such as https://github.com/dbry/adpcm-xq (make sure to set correct block size)
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;
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main {
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ubyte adpcm_blocks_left
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uword vera_rate_hz
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ubyte vera_rate
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ubyte num_adpcm_blocks
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uword adpcm_size
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uword @requirezp nibblesptr
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sub start() {
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if not wavfile.parse_header(&wavdata.wav_data) {
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txt.print("invalid wav\n")
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sys.exit(1)
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}
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calculate_vera_rate()
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calculate_adpcm_blocks()
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txt.print_ub(num_adpcm_blocks)
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txt.print(" blocks = ")
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txt.print_uw(adpcm_size)
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txt.print(" adpcm bytes\nsamplerate = ")
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txt.print_uw(wavfile.sample_rate)
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txt.print(" vera rate = ")
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txt.print_uw(vera_rate_hz)
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txt.print(" #channels = ")
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txt.print_ub(wavfile.nchannels)
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txt.print("\n\n(b)enchmark or (p)layback? ")
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when cbm.CHRIN() {
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'b' -> {
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cbm.SETTIM(0,0,0)
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when wavfile.nchannels {
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1-> {
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mono.benchmark()
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decoding_report(1 + 252*2)
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}
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2-> {
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stereo.benchmark()
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decoding_report(2 + 248*4)
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}
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}
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}
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'p' -> playback()
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}
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}
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sub calculate_vera_rate() {
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const float vera_freq_factor = 25e6 / 65536.0
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vera_rate = (wavfile.sample_rate as float / vera_freq_factor) + 1.0 as ubyte
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vera_rate_hz = (vera_rate as float) * vera_freq_factor as uword
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}
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sub calculate_adpcm_blocks() {
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adpcm_size = wavfile.data_size_lo ; we assume the data is <64Kb so only low word is enough
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num_adpcm_blocks = (adpcm_size / 256) as ubyte ; THE ADPCM DATA NEEDS TO BE ENCODED IN 256-byte BLOCKS !
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}
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sub decoding_report(float pcm_words_per_block) {
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const float REFRESH_RATE = 25.0e6/(525.0*800) ; Vera VGA refresh rate is not precisely 60 hz!
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float duration_secs = (cbm.RDTIM16() as float) / REFRESH_RATE
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floats.print(duration_secs)
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txt.print(" seconds (approx)\n")
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float src_per_second = adpcm_size as float / duration_secs
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txt.print_uw(src_per_second as uword)
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txt.print(" adpcm data bytes/sec\n")
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float words_per_second = pcm_words_per_block * (num_adpcm_blocks as float) / duration_secs
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when wavfile.nchannels {
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1 -> {
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txt.print_uw(words_per_second as uword)
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txt.print(" decoded mono pcm words/sec (max hz)\n")
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}
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2 -> {
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txt.print_uw(words_per_second as uword)
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txt.print(" decoded pcm words/sec\n")
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txt.print_uw(words_per_second/2 as uword)
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txt.print(" decoded stereo audio frames/sec (max hz)\n")
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}
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}
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}
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sub playback() {
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nibblesptr = &wavdata.wav_data + wavfile.data_offset
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adpcm_blocks_left = num_adpcm_blocks
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sys.set_irqd()
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cx16.VERA_AUDIO_RATE = 0 ; halt playback
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repeat 1024 {
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cx16.VERA_AUDIO_DATA = 0
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}
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when wavfile.nchannels {
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1 -> {
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cx16.VERA_AUDIO_CTRL = %10101011 ; mono 16 bit, volume 11
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cbm.CINV = &mono.irq_handler
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}
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2 -> {
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cx16.VERA_AUDIO_CTRL = %10111011 ; stereo 16 bit, volume 11
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cbm.CINV = &stereo.irq_handler
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}
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}
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cx16.VERA_IEN = %00001000 ; enable AFLOW
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sys.clear_irqd()
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cx16.VERA_AUDIO_RATE = vera_rate ; start playback
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txt.print("\naudio via irq\n")
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repeat {
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; audio will play via the IRQ.
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}
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; not reached:
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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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}
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}
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mono {
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sub benchmark() {
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main.nibblesptr = &wavdata.wav_data + wavfile.data_offset
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txt.print("\ndecoding all blocks...\n")
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repeat main.num_adpcm_blocks
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decode_block()
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}
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sub decode_block() {
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; refill the fifo buffer with one decoded adpcm block (1010 bytes of pcm data)
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adpcm.init(peekw(main.nibblesptr), @(main.nibblesptr+2))
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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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main.nibblesptr += 4
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ubyte @zp nibble
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repeat 252/2 {
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unroll 2 {
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nibble = @(main.nibblesptr)
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adpcm.decode_nibble(nibble & 15) ; first 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) ; second 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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main.nibblesptr++
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}
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}
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}
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sub irq_handler() {
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if cx16.VERA_ISR & %00001000 !=0 {
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; AFLOW irq.
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;; cx16.vpoke(1,$fa0c, $a0) ; paint a screen color
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decode_block()
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main.adpcm_blocks_left--
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if main.adpcm_blocks_left==0 {
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; restart adpcm data from the beginning
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main.nibblesptr = &wavdata.wav_data + wavfile.data_offset
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main.adpcm_blocks_left = main.num_adpcm_blocks
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txt.print("end of data, restarting.\n")
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}
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} else {
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; it's not AFLOW, handle other IRQ here.
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}
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;; cx16.vpoke(1,$fa0c, 0) ; back to other screen color
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%asm {{
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ply
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plx
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pla
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rti
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}}
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}
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}
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stereo {
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sub benchmark() {
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main.nibblesptr = &wavdata.wav_data + wavfile.data_offset
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txt.print("\n\ndecoding all blocks...\n")
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repeat main.num_adpcm_blocks
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decode_block()
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}
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sub decode_block() {
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; refill the fifo buffer with one decoded adpcm block (1010 bytes of pcm data)
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adpcm.init(peekw(main.nibblesptr), @(main.nibblesptr+2)) ; left channel
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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.init_second(peekw(main.nibblesptr+4), @(main.nibblesptr+6)) ; right channel
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cx16.VERA_AUDIO_DATA = lsb(adpcm.predict_2)
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cx16.VERA_AUDIO_DATA = msb(adpcm.predict_2)
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main.nibblesptr += 8
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repeat 248/8
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decode_nibbles_unrolled()
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}
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sub decode_nibbles_unrolled() {
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; decode 4 left channel nibbles
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uword[8] left
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uword[8] right
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ubyte @requirezp nibble = @(main.nibblesptr)
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adpcm.decode_nibble(nibble & 15) ; first word
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left[0] = adpcm.predict
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adpcm.decode_nibble(nibble>>4) ; second word
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left[1] = adpcm.predict
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nibble = @(main.nibblesptr+1)
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adpcm.decode_nibble(nibble & 15) ; first word
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left[2] = adpcm.predict
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adpcm.decode_nibble(nibble>>4) ; second word
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left[3] = adpcm.predict
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nibble = @(main.nibblesptr+2)
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adpcm.decode_nibble(nibble & 15) ; first word
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left[4] = adpcm.predict
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adpcm.decode_nibble(nibble>>4) ; second word
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left[5] = adpcm.predict
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nibble = @(main.nibblesptr+3)
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adpcm.decode_nibble(nibble & 15) ; first word
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left[6] = adpcm.predict
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adpcm.decode_nibble(nibble>>4) ; second word
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left[7] = adpcm.predict
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; decode 4 right channel nibbles
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nibble = @(main.nibblesptr+4)
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adpcm.decode_nibble_second(nibble & 15) ; first word
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right[0] = adpcm.predict_2
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adpcm.decode_nibble_second(nibble>>4) ; second word
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right[1] = adpcm.predict_2
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nibble = @(main.nibblesptr+5)
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adpcm.decode_nibble_second(nibble & 15) ; first word
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right[2] = adpcm.predict_2
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adpcm.decode_nibble_second(nibble>>4) ; second word
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right[3] = adpcm.predict_2
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nibble = @(main.nibblesptr+6)
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adpcm.decode_nibble_second(nibble & 15) ; first word
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right[4] = adpcm.predict_2
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adpcm.decode_nibble_second(nibble>>4) ; second word
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right[5] = adpcm.predict_2
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nibble = @(main.nibblesptr+7)
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adpcm.decode_nibble_second(nibble & 15) ; first word
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right[6] = adpcm.predict_2
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adpcm.decode_nibble_second(nibble>>4) ; second word
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right[7] = adpcm.predict_2
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main.nibblesptr += 8
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%asm {{
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; copy to vera PSG fifo buffer
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ldy #0
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- lda p8v_left,y
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sta cx16.VERA_AUDIO_DATA
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lda p8v_left+1,y
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sta cx16.VERA_AUDIO_DATA
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lda p8v_right,y
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sta cx16.VERA_AUDIO_DATA
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lda p8v_right+1,y
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sta cx16.VERA_AUDIO_DATA
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iny
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iny
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cpy #16
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bne -
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}}
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}
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sub irq_handler() {
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if cx16.VERA_ISR & %00001000 !=0 {
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; AFLOW irq.
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;; cx16.vpoke(1,$fa0c, $a0) ; paint a screen color
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decode_block()
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main.adpcm_blocks_left--
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if main.adpcm_blocks_left==0 {
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; restart adpcm data from the beginning
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main.nibblesptr = &wavdata.wav_data + wavfile.data_offset
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main.adpcm_blocks_left = main.num_adpcm_blocks
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txt.print("end of data, restarting.\n")
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}
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} else {
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; it's not AFLOW, handle other IRQ here.
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}
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;; cx16.vpoke(1,$fa0c, 0) ; back to other screen color
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%asm {{
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ply
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plx
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pla
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rti
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}}
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}
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}
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wavdata {
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%option align_page
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wav_data:
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%asmbinary "small-adpcm-mono.wav"
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wav_data_end:
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}
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