mirror of
https://github.com/curioustorvald/tsvm.git
synced 2026-06-06 13:38:30 +09:00
313 lines
13 KiB
JavaScript
313 lines
13 KiB
JavaScript
/*
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* LibTaud — Helper functions for interaction between Taud format and TSVM Tracker
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* Requires TVDOS to function.
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* @author CuriousTorvald
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*/
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// ── Format constants ────────────────────────────────────────────────────────
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const TAUD_MAGIC = [0x1F,0x54,0x53,0x56,0x4D,0x61,0x75,0x64] // \x1F TSVMaud
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const TAUD_VERSION = 1
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const TAUD_HEADER_SIZE = 32 // magic(8) + version(1) + numSongs(1) + compSize(4) + projOff(4) + sig(14)
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const TAUD_SONG_ENTRY = 32 // see encodeSongEntry / decodeSongEntry below
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const SAMPLEINST_SIZE = 786432 // 737280 sample + 49152 instrument (256 × 192)
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const PATTERN_SIZE = 512 // bytes per pattern (64 rows × 8 bytes)
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const NUM_PATTERNS_MAX = 256
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const NUM_CUES = 1024
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const CUE_SIZE = 32 // bytes per cue entry (packed 12-bit×20 voices + instruction + pad)
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// Signature written into the file (14 bytes, space-padded)
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const CAPTURE_SIGNATURE = "LibTaud/TSVM "
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// ── Internal helpers ────────────────────────────────────────────────────────
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function _peekU32LE(ptr, off) {
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return ((sys.peek(ptr+off) & 0xFF) ) |
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((sys.peek(ptr+off+1) & 0xFF) << 8 ) |
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((sys.peek(ptr+off+2) & 0xFF) << 16 ) |
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((sys.peek(ptr+off+3) & 0xFF) * 0x1000000) // avoid sign-extend
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}
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function _pokeU32LE(ptr, off, v) {
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sys.poke(ptr+off, (v ) & 0xFF)
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sys.poke(ptr+off+1, (v >>> 8) & 0xFF)
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sys.poke(ptr+off+2, (v >>> 16) & 0xFF)
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sys.poke(ptr+off+3, (v >>> 24) & 0xFF)
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}
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// ── uploadTaudFile ──────────────────────────────────────────────────────────
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/**
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* Load one song from a Taud file into the tracker hardware and configure the
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* given playhead ready to play.
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*
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* @param inFile Full path with drive letter, e.g. "A:/music/song.taud"
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* @param songIndex 0-based index of the song in the SONG TABLE
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* @param playhead Playhead number (0-3) to configure
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*/
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function uploadTaudFile(inFile, songIndex, playhead) {
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const drive = inFile[0].toUpperCase()
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const diskPath = inFile.substring(2)
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const memBase = audio.getMemAddr()
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// -- 1. Read whole file into VM memory ------------------------------------
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const fileHandle = files.open(inFile)
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if (!fileHandle.exists) {
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throw Error("taud: file not exists")
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}
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const fileSize = fileHandle.size
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const filePtr = sys.malloc(fileSize)
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fileHandle.pread(filePtr, fileSize, 0)
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let pos = 0
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// -- 2. Verify magic ------------------------------------------------------
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for (let i = 0; i < 8; i++) {
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let magicc = sys.peek(filePtr + i)
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if (magicc !== TAUD_MAGIC[i]) {
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sys.free(filePtr)
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throw Error("taud: bad magic byte " + magicc.toString(16) + " at index " + i)
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}
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}
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pos = 8
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// -- 3. Parse header ------------------------------------------------------
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// version(1) + numSongs(1) + compressedSize(4) + rsvd(2) + signature(16) = 24 bytes
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let version = sys.peek(filePtr + pos) & 0xFF; pos++
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let numSongs = sys.peek(filePtr + pos) & 0xFF; pos++
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let compressedSize = _peekU32LE(filePtr, pos); pos += 4
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pos += 18 // skip reserved(2) + signature(16)
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// pos == 32 == TAUD_HEADER_SIZE
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if (songIndex < 0 || songIndex >= numSongs) {
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sys.free(filePtr)
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throw Error("taud: songIndex " + songIndex + " out of range (numSongs=" + numSongs + ")")
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}
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// -- 4. Decompress and upload sample+instrument bin -----------------------
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let decompPtr = sys.malloc(SAMPLEINST_SIZE)
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gzip.decompFromTo(filePtr + pos, compressedSize, decompPtr)
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pos += compressedSize
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// Write decompressed data to peripheral memory (backwards addressing:
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// peripheral byte k lives at memBase - k).
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for (let i = 0; i < SAMPLEINST_SIZE; i++) {
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// TODO use sys.memcpy
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sys.poke(memBase - i, sys.peek(decompPtr + i))
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}
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sys.free(decompPtr)
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// -- 5. Parse song-table entry for the requested song --------------------
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let entryOff = pos + songIndex * TAUD_SONG_ENTRY
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let songOffset = _peekU32LE(filePtr, entryOff)
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let numVoices = sys.peek(filePtr + entryOff + 4) & 0xFF
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let numPatsLo = sys.peek(filePtr + entryOff + 5) & 0xFF
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let numPatsHi = sys.peek(filePtr + entryOff + 6) & 0xFF
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let bpmStored = sys.peek(filePtr + entryOff + 7) & 0xFF
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let tickRate = sys.peek(filePtr + entryOff + 8) & 0xFF
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let mixerflags = sys.peek(filePtr + entryOff + 15) & 0xFF
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let songGlobalVolume = sys.peek(filePtr + entryOff + 16) & 0xFF
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let songMixingVolume = sys.peek(filePtr + entryOff + 17) & 0xFF
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let patBinCompSize = _peekU32LE(filePtr, entryOff + 18)
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let cueSheetCompSize = _peekU32LE(filePtr, entryOff + 22)
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let bpm = bpmStored + 24
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let patsToLoad = numPatsLo | (numPatsHi << 8)
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// -- 6. Decompress + upload patterns --------------------------------------
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let patBinSize = patsToLoad * PATTERN_SIZE
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let patBinPtr = sys.malloc(patBinSize)
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gzip.decompFromTo(filePtr + songOffset, patBinCompSize, patBinPtr)
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let patBytes = new Array(PATTERN_SIZE)
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for (let p = 0; p < patsToLoad; p++) {
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for (let k = 0; k < PATTERN_SIZE; k++)
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patBytes[k] = sys.peek(patBinPtr + p * PATTERN_SIZE + k) & 0xFF
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audio.uploadPattern(p, patBytes)
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}
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sys.free(patBinPtr)
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// -- 7. Decompress + upload cue sheet -------------------------------------
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let cueSheetSize = NUM_CUES * CUE_SIZE
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let cueSheetPtr = sys.malloc(cueSheetSize)
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gzip.decompFromTo(filePtr + songOffset + patBinCompSize, cueSheetCompSize, cueSheetPtr)
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let cueBytes = new Array(CUE_SIZE)
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for (let c = 0; c < NUM_CUES; c++) {
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for (let k = 0; k < CUE_SIZE; k++)
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cueBytes[k] = sys.peek(cueSheetPtr + c * CUE_SIZE + k) & 0xFF
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audio.uploadCue(c, cueBytes)
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}
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sys.free(cueSheetPtr)
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// -- 8. Configure playhead ------------------------------------------------
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audio.setTrackerMode(playhead)
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audio.setBPM(playhead, bpm)
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audio.setTickRate(playhead, tickRate > 0 ? tickRate : 6)
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audio.setTrackerMixerFlags(playhead, mixerflags)
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audio.setSongGlobalVolume(playhead, songGlobalVolume)
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audio.setSongMixingVolume(playhead, songMixingVolume)
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fileHandle.close()
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sys.free(filePtr)
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}
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// ── captureTrackerDataToFile ────────────────────────────────────────────────
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/**
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* Dump the current tracker hardware state (sample bin, instruments, patterns
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* in bank 0, cue sheet) to a single-song Taud file. BPM and tick-rate are
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* taken from playhead 0.
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*
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* @param outFile Full path with drive letter, e.g. "A:/music/out.taud"
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*/
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function captureTrackerDataToFile(outFile) {
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const drive = outFile[0].toUpperCase()
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const diskPath = outFile.substring(2)
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const memBase = audio.getMemAddr()
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const baseAddr = audio.getBaseAddr()
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// -- 1. Compress sample+instrument bin ------------------------------------
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// sys.memcpy(negative_src, positive_dst, len) copies peripheral byte k from
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// (memBase - k) into (sampleInstBuf + k).
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let sampleInstBuf = sys.malloc(SAMPLEINST_SIZE)
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sys.memcpy(memBase, sampleInstBuf, SAMPLEINST_SIZE)
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let compBuf = sys.malloc(SAMPLEINST_SIZE + 4096) // headroom for incompressible data
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let compressedSize = gzip.compFromTo(sampleInstBuf, SAMPLEINST_SIZE, compBuf)
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sys.free(sampleInstBuf)
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// -- 2. Find last non-empty pattern in bank 0 (all-zero = uninitialized) --
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let numPatsActual = 0
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outer: for (let p = NUM_PATTERNS_MAX - 1; p >= 0; p--) {
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let patBase = 131072 + p * PATTERN_SIZE // offset within peripheral memory space
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for (let k = 0; k < PATTERN_SIZE; k++) {
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if ((sys.peek(memBase - (patBase + k)) & 0xFF) !== 0) {
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numPatsActual = p + 1
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break outer
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}
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}
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}
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if (numPatsActual === 0) numPatsActual = 1 // always emit at least one pattern slot
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let numPats = numPatsActual // Uint16, 1-65535
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let patsToSave = numPatsActual
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// -- 3. BPM / tick-rate / volumes from playhead 0 -------------------------
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let bpm = audio.getBPM(0) || 125
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let tickRate = audio.getTickRate(0) || 6
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let bpmStored = (bpm - 24) & 0xFF
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let songGlobalVolume = audio.getSongGlobalVolume(0)
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let songMixingVolume = audio.getSongMixingVolume(0)
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if (songGlobalVolume === undefined || songGlobalVolume === null) songGlobalVolume = 0x80
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if (songMixingVolume === undefined || songMixingVolume === null) songMixingVolume = 0x80
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// -- 4. Compress pattern bin ----------------------------------------------
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let patBinSize = patsToSave * PATTERN_SIZE
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let patBuf = sys.malloc(patBinSize)
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sys.memcpy(memBase - 131072, patBuf, patBinSize)
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let patCompBuf = sys.malloc(patBinSize + 4096)
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let patCompSize = gzip.compFromTo(patBuf, patBinSize, patCompBuf)
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sys.free(patBuf)
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// -- 5. Compress cue sheet ------------------------------------------------
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// Cue entry c, byte k is at MMIO address 32768 + c*32 + k,
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// accessed as sys.peek(baseAddr − (32768 + c*32 + k)).
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let cueSheetSize = NUM_CUES * CUE_SIZE
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let cueBuf = sys.malloc(cueSheetSize)
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for (let c = 0; c < NUM_CUES; c++) {
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let cueOff = 32768 + c * CUE_SIZE
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for (let k = 0; k < CUE_SIZE; k++)
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sys.poke(cueBuf + c * CUE_SIZE + k,
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sys.peek(baseAddr - (cueOff + k)) & 0xFF)
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}
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let cueCompBuf = sys.malloc(cueSheetSize + 4096)
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let cueCompSize = gzip.compFromTo(cueBuf, cueSheetSize, cueCompBuf)
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sys.free(cueBuf)
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// -- 6. Compute song offset (absolute from file start) --------------------
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// Layout: header(32) + compressed(compressedSize) + songTable(1 × TAUD_SONG_ENTRY)
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let songOffset = TAUD_HEADER_SIZE + compressedSize + 1 * TAUD_SONG_ENTRY
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// -- 7. Build header byte array (32 bytes) --------------------------------
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let sigBytes = new Array(14)
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for (let i = 0; i < 14; i++)
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sigBytes[i] = i < CAPTURE_SIGNATURE.length ? CAPTURE_SIGNATURE.charCodeAt(i) : 0
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let header = [
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// Magic (8)
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0x1F, 0x54, 0x53, 0x56, 0x4D, 0x61, 0x75, 0x64,
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// version, numSongs
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TAUD_VERSION, 1,
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// compressedSize uint32 LE (4) -- sample+inst bin
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(compressedSize ) & 0xFF,
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(compressedSize >>> 8) & 0xFF,
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(compressedSize >>> 16) & 0xFF,
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(compressedSize >>> 24) & 0xFF,
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// project data offset (4) -- not emitted
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0x00, 0x00, 0x00, 0x00,
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].concat(sigBytes) // 8 + 2 + 4 + 4 + 14 = 32 bytes
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// -- 8. Build song-table row (32 bytes) -----------------------------------
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let songTable = [
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(songOffset ) & 0xFF,
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(songOffset >>> 8) & 0xFF,
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(songOffset >>> 16) & 0xFF,
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(songOffset >>> 24) & 0xFF,
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20, // numVoices
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numPats & 0xFF, (numPats >>> 8) & 0xFF, // numPatterns Uint16 LE
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bpmStored, // BPM with −24 bias
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tickRate, // initial tick-rate
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0x00,0xA0, // basenote (0xA000 -- C9)
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0x00,0xAC,0x02,0x46, // basefreq (8363 Hz)
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sys.peek(baseAddr - 7), // mixer flags
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songGlobalVolume & 0xFF, // global volume
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songMixingVolume & 0xFF, // mixing volume
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// pattern bin compressed size (4)
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(patCompSize ) & 0xFF,
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(patCompSize >>> 8) & 0xFF,
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(patCompSize >>> 16) & 0xFF,
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(patCompSize >>> 24) & 0xFF,
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// cue sheet compressed size (4)
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(cueCompSize ) & 0xFF,
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(cueCompSize >>> 8) & 0xFF,
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(cueCompSize >>> 16) & 0xFF,
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(cueCompSize >>> 24) & 0xFF,
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// reserved (6)
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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]
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// -- 9. Write header (creates / truncates file) ---------------------------
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const fileHandle = files.open(outFile)
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fileHandle.bwrite(header)
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// -- 10. Append compressed sample+inst bin --------------------------------
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fileHandle.pwrite(compBuf, compressedSize, TAUD_HEADER_SIZE)
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sys.free(compBuf)
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// -- 11. Write song table -------------------------------------------------
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fileHandle.bwrite(songTable)
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// -- 12. Append compressed pattern bin ------------------------------------
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fileHandle.pwrite(patCompBuf, patCompSize,
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TAUD_HEADER_SIZE + compressedSize + songTable.length)
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sys.free(patCompBuf)
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// -- 13. Append compressed cue sheet --------------------------------------
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fileHandle.pwrite(cueCompBuf, cueCompSize,
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TAUD_HEADER_SIZE + compressedSize + songTable.length + patCompSize)
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sys.free(cueCompBuf)
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fileHandle.flush(); fileHandle.close()
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}
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exports = { uploadTaudFile, captureTrackerDataToFile }
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