mirror of
https://github.com/irmen/prog8.git
synced 2024-12-20 20:31:51 +00:00
1e9bbd662b
fix stream-wav missing rts which corrupted playback fix showbmx example palette and image centering
400 lines
13 KiB
Lua
400 lines
13 KiB
Lua
;
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; This program can stream a regular .wav file from the sdcard.
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; It can be uncompressed or IMA-adpcm compressed (factor 4 lossy compression).
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; See the "adpcm" module source for tips how to create those files.
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;
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; Note that 8 bit wav files are *unsigned* values whereas Vera wants *signed* values
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; so these have to be converted on the fly. 16 bit wav files are signed already.
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;
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; The playback is done via AFLOW irq handler that fills the audio fifo buffer
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; with around 1 Kb of new audio data. (copies raw pcm data or decodes adpcm block)
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; In the meantime the main program loop reads new data blocks from the wav file
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; as it is being played.
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;
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; NOTE: stripping the wav header and just having the raw pcm data in the file
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; is slightly more efficient because the data blocks are then sector-aligned on the disk
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;
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%import diskio
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%import floats
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%import adpcm
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%import wavfile
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%import textio
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%option no_sysinit
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main {
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str MUSIC_FILENAME = "?"*32
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uword vera_rate_hz
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ubyte vera_rate
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sub start() {
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;; diskio.fastmode(1)
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txt.print("name of .wav file to play on drive 8: ")
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while 0==txt.input_chars(MUSIC_FILENAME) {
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; until user types a name...
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}
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prepare_music()
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txt.print("\ngood file! playback starts! ")
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cx16.rombank(0) ; activate kernal bank for faster calls
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interrupts.wait()
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interrupts.set_handler()
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play_stuff()
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txt.print("done!\n")
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repeat { }
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}
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sub error(str msg) {
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txt.print(msg)
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repeat { }
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}
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sub prepare_music() {
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txt.print("\nchecking ")
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txt.print(MUSIC_FILENAME)
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txt.nl()
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bool wav_ok = false
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if diskio.f_open(MUSIC_FILENAME) {
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void diskio.f_read(music.buffer, 128)
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wav_ok = wavfile.parse_header(music.buffer)
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diskio.f_close()
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}
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if not wav_ok
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error("no good wav file!")
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calculate_vera_rate()
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txt.print("wav format: ")
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txt.print_ub(wavfile.wavefmt)
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txt.print("\nchannels: ")
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txt.print_ub(wavfile.nchannels)
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txt.print("\nsample rate: ")
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txt.print_uw(wavfile.sample_rate)
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txt.print("\nbits per sample: ")
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txt.print_uw(wavfile.bits_per_sample)
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txt.print("\ndata size: ")
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txt.print_uwhex(wavfile.data_size_hi, true)
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txt.print_uwhex(wavfile.data_size_lo, false)
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txt.print("\nvera rate: ")
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txt.print_ub(vera_rate)
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txt.print(" = ")
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txt.print_uw(vera_rate_hz)
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txt.print(" hz\n")
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if wavfile.wavefmt==wavfile.WAVE_FORMAT_DVI_ADPCM {
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txt.print("adpcm block size: ")
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txt.print_uw(wavfile.block_align)
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txt.nl()
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}
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if wavfile.nchannels>2 or
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(wavfile.wavefmt!=wavfile.WAVE_FORMAT_DVI_ADPCM and wavfile.wavefmt!=wavfile.WAVE_FORMAT_PCM) or
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wavfile.sample_rate > 48828 or
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wavfile.bits_per_sample>16
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error("unsupported format!")
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if wavfile.wavefmt==wavfile.WAVE_FORMAT_DVI_ADPCM {
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if(wavfile.block_align!=256) {
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error("unsupported block alignment!")
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}
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}
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cx16.VERA_AUDIO_RATE = 0 ; halt playback
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cx16.VERA_AUDIO_CTRL = %10101011 ; mono 16 bit, volume 11
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if wavfile.nchannels==2
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cx16.VERA_AUDIO_CTRL = %10111011 ; stereo 16 bit, volume 11
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if(wavfile.bits_per_sample==8)
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cx16.VERA_AUDIO_CTRL &= %11011111 ; set to 8 bit instead
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repeat 1024
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cx16.VERA_AUDIO_DATA = 0 ; fill buffer with short silence
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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 play_stuff() {
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if diskio.f_open(MUSIC_FILENAME) {
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uword block_size = 1024
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if wavfile.wavefmt==wavfile.WAVE_FORMAT_DVI_ADPCM
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block_size = wavfile.block_align * 2 ; read 2 adpcm blocks at a time (512 bytes)
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void diskio.f_read(music.buffer, wavfile.data_offset) ; skip to actual sample data start
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music.pre_buffer(block_size)
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cx16.VERA_AUDIO_RATE = vera_rate ; start audio playback
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str progress_chars = "-\\|/-\\|/"
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ubyte progress = 0
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repeat {
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interrupts.wait()
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if interrupts.aflow {
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interrupts.aflow=false
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if not music.load_next_block(block_size)
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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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txt.chrout(progress_chars[progress/2 & 7])
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txt.chrout($9d) ; cursor left
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progress++
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}
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}
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diskio.f_close()
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} else {
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error("load error")
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}
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cx16.VERA_AUDIO_RATE = 0 ; halt playback
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}
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}
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interrupts {
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sub set_handler() {
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sys.set_irqd()
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cbm.CINV = &handler ; irq handler for AFLOW
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cx16.VERA_IEN = %00001000 ; enable AFLOW only
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sys.clear_irqd()
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}
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bool aflow
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inline 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 handler() {
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; we only handle aflow in this example.
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if cx16.VERA_ISR & %00001000 !=0 {
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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.aflow_play_block()
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cx16.restore_virtual_registers()
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aflow = true
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}
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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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music {
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uword @requirezp nibblesptr
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uword buffer = memory("buffer", 1024, 256)
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sub pre_buffer(uword block_size) {
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; pre-buffer first block
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void diskio.f_read(buffer, block_size)
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}
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sub aflow_play_block() {
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; play block that is currently in the buffer
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if wavfile.wavefmt==wavfile.WAVE_FORMAT_DVI_ADPCM {
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nibblesptr = buffer
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if wavfile.nchannels==2 {
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adpcm_block_stereo()
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adpcm_block_stereo()
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}
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else {
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adpcm_block_mono()
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adpcm_block_mono()
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}
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}
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else if wavfile.bits_per_sample==16
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uncompressed_block_16()
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else
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uncompressed_block_8()
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}
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sub load_next_block(uword block_size) -> 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, block_size) == block_size
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}
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asmsub uncompressed_block_8() {
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; copy 1024 bytes of audio data from the buffer into vera's fifo, quickly!
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; converting unsigned wav 8 bit samples to signed 8 bit on the fly.
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%asm {{
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lda p8v_buffer
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sta _loop+1
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sta _lp2+1
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lda p8v_buffer+1
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sta _loop+2
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sta _lp2+2
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ldx #4
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ldy #0
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_loop lda $ffff,y
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eor #$80 ; convert to signed
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sta cx16.VERA_AUDIO_DATA
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iny
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_lp2 lda $ffff,y
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eor #$80 ; convert to signed
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sta cx16.VERA_AUDIO_DATA
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iny
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bne _loop
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inc _loop+2
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inc _lp2+2
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dex
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bne _loop
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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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; ubyte @requirezp sample
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; repeat 1024 {
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; sample = @(ptr) - 128
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; cx16.VERA_AUDIO_DATA = sample
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; ptr++
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; }
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}
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asmsub uncompressed_block_16() {
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; copy 1024 bytes of audio data from the buffer into vera's fifo, quickly!
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%asm {{
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lda p8v_buffer
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sta _loop+1
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sta _lp2+1
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lda p8v_buffer+1
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sta _loop+2
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sta _lp2+2
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ldx #4
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ldy #0
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_loop lda $ffff,y
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sta cx16.VERA_AUDIO_DATA
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iny
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_lp2 lda $ffff,y
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sta cx16.VERA_AUDIO_DATA
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iny
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bne _loop
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inc _loop+2
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inc _lp2+2
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dex
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bne _loop
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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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sub adpcm_block_mono() {
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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(nibblesptr), @(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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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 = @(nibblesptr)
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; note: when calling decode_nibble(), the upper nibble in the argument needs to be zero
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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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nibblesptr++
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}
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}
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}
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sub adpcm_block_stereo() {
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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(nibblesptr), @(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(nibblesptr+4), @(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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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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; note: when calling decode_nibble(), the upper nibble in the argument needs to be zero
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uword[8] left
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uword[8] right
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ubyte @requirezp nibble = @(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 = @(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 = @(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 = @(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 = @(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 = @(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 = @(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 = @(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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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_lsb,y
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sta cx16.VERA_AUDIO_DATA
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lda p8v_left_msb,y
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sta cx16.VERA_AUDIO_DATA
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lda p8v_right_lsb,y
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sta cx16.VERA_AUDIO_DATA
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lda p8v_right_msb,y
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sta cx16.VERA_AUDIO_DATA
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iny
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cpy #8
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bne -
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}}
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}
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}
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