mirror of
https://github.com/curioustorvald/tsvm.git
synced 2026-06-06 21:44:04 +09:00
260 lines
11 KiB
JavaScript
260 lines
11 KiB
JavaScript
/*
|
||
* LibTaud — Helper functions for interaction between Taud format and TSVM Tracker
|
||
* Requires TVDOS to function.
|
||
* @author CuriousTorvald
|
||
*/
|
||
|
||
// ── Format constants ────────────────────────────────────────────────────────
|
||
|
||
const TAUD_MAGIC = [0x1F,0x54,0x53,0x56,0x4D,0x61,0x75,0x64] // \x1F TSVMaud
|
||
const TAUD_VERSION = 1
|
||
const TAUD_HEADER_SIZE = 32 // magic(8) + version(1) + numSongs(1) + compSize(4) + rsvd(2) + sig(16)
|
||
const TAUD_SONG_ENTRY = 16 // bytes per song-table row (offset(4)+voices(1)+pats(2)+bpm(1)+tick(1)+pad(7))
|
||
const SAMPLEINST_SIZE = 786432 // 770047 sample + 16384 instrument
|
||
const PATTERN_SIZE = 512 // bytes per pattern (64 rows × 8 bytes)
|
||
const NUM_PATTERNS_MAX = 256
|
||
const NUM_CUES = 1024
|
||
const CUE_SIZE = 32 // bytes per cue entry (packed 12-bit×20 voices + instruction + pad)
|
||
|
||
// Signature written into the file (16 bytes, space-padded)
|
||
const CAPTURE_SIGNATURE = "LibTaud/TSVM "
|
||
|
||
// ── Internal helpers ────────────────────────────────────────────────────────
|
||
|
||
function _peekU32LE(ptr, off) {
|
||
return ((sys.peek(ptr+off) & 0xFF) ) |
|
||
((sys.peek(ptr+off+1) & 0xFF) << 8 ) |
|
||
((sys.peek(ptr+off+2) & 0xFF) << 16 ) |
|
||
((sys.peek(ptr+off+3) & 0xFF) * 0x1000000) // avoid sign-extend
|
||
}
|
||
|
||
function _pokeU32LE(ptr, off, v) {
|
||
sys.poke(ptr+off, (v ) & 0xFF)
|
||
sys.poke(ptr+off+1, (v >>> 8) & 0xFF)
|
||
sys.poke(ptr+off+2, (v >>> 16) & 0xFF)
|
||
sys.poke(ptr+off+3, (v >>> 24) & 0xFF)
|
||
}
|
||
|
||
// ── uploadTaudFile ──────────────────────────────────────────────────────────
|
||
|
||
/**
|
||
* Load one song from a Taud file into the tracker hardware and configure the
|
||
* given playhead ready to play.
|
||
*
|
||
* @param inFile Full path with drive letter, e.g. "A:/music/song.taud"
|
||
* @param songIndex 0-based index of the song in the SONG TABLE
|
||
* @param targetPlaydataSlot Playhead number (0-3) to configure
|
||
*/
|
||
function uploadTaudFile(inFile, songIndex, targetPlaydataSlot) {
|
||
const drive = inFile[0].toUpperCase()
|
||
const diskPath = inFile.substring(2)
|
||
|
||
const memBase = audio.getMemAddr()
|
||
|
||
// -- 1. Read whole file into VM memory ------------------------------------
|
||
const fileHandle = files.open(inFile)
|
||
|
||
if (!fileHandle.exists) {
|
||
throw Error("taud: file not exists")
|
||
}
|
||
|
||
const fileSize = fileHandle.size
|
||
const filePtr = sys.malloc(fileSize)
|
||
fileHandle.pread(filePtr, fileSize, 0)
|
||
|
||
let pos = 0
|
||
|
||
// -- 2. Verify magic ------------------------------------------------------
|
||
for (let i = 0; i < 8; i++) {
|
||
let magicc = sys.peek(filePtr + i)
|
||
if (magicc !== TAUD_MAGIC[i]) {
|
||
sys.free(filePtr)
|
||
throw Error("taud: bad magic byte " + magicc.toString(16) + " at index " + i)
|
||
}
|
||
}
|
||
pos = 8
|
||
|
||
// -- 3. Parse header ------------------------------------------------------
|
||
// version(1) + numSongs(1) + compressedSize(4) + rsvd(2) + signature(16) = 24 bytes
|
||
let version = sys.peek(filePtr + pos) & 0xFF; pos++
|
||
let numSongs = sys.peek(filePtr + pos) & 0xFF; pos++
|
||
let compressedSize = _peekU32LE(filePtr, pos); pos += 4
|
||
pos += 18 // skip reserved(2) + signature(16)
|
||
// pos == 32 == TAUD_HEADER_SIZE
|
||
|
||
if (songIndex < 0 || songIndex >= numSongs) {
|
||
sys.free(filePtr)
|
||
throw Error("taud: songIndex " + songIndex + " out of range (numSongs=" + numSongs + ")")
|
||
}
|
||
|
||
// -- 4. Decompress and upload sample+instrument bin -----------------------
|
||
let decompPtr = sys.malloc(SAMPLEINST_SIZE)
|
||
gzip.decompFromTo(filePtr + pos, compressedSize, decompPtr)
|
||
pos += compressedSize
|
||
|
||
// Write decompressed data to peripheral memory (backwards addressing:
|
||
// peripheral byte k lives at memBase - k).
|
||
for (let i = 0; i < SAMPLEINST_SIZE; i++) {
|
||
sys.poke(memBase - i, sys.peek(decompPtr + i))
|
||
}
|
||
sys.free(decompPtr)
|
||
|
||
// -- 5. Parse song-table entry for the requested song --------------------
|
||
let entryOff = pos + songIndex * TAUD_SONG_ENTRY
|
||
let songOffset = _peekU32LE(filePtr, entryOff)
|
||
let numVoices = sys.peek(filePtr + entryOff + 4) & 0xFF
|
||
let numPatsLo = sys.peek(filePtr + entryOff + 5) & 0xFF
|
||
let numPatsHi = sys.peek(filePtr + entryOff + 6) & 0xFF
|
||
let bpmStored = sys.peek(filePtr + entryOff + 7) & 0xFF
|
||
let tickRate = sys.peek(filePtr + entryOff + 8) & 0xFF
|
||
|
||
let bpm = bpmStored + 24
|
||
let patsToLoad = numPatsLo | (numPatsHi << 8)
|
||
|
||
// -- 6. Upload patterns ---------------------------------------------------
|
||
let songBase = filePtr + songOffset
|
||
let patBytes = new Array(PATTERN_SIZE)
|
||
for (let p = 0; p < patsToLoad; p++) {
|
||
for (let k = 0; k < PATTERN_SIZE; k++)
|
||
patBytes[k] = sys.peek(songBase + p * PATTERN_SIZE + k) & 0xFF
|
||
audio.uploadPattern(p, patBytes)
|
||
}
|
||
|
||
// -- 7. Upload cue sheet --------------------------------------------------
|
||
let cueBase = songBase + patsToLoad * PATTERN_SIZE
|
||
let cueBytes = new Array(CUE_SIZE)
|
||
for (let c = 0; c < NUM_CUES; c++) {
|
||
for (let k = 0; k < CUE_SIZE; k++)
|
||
cueBytes[k] = sys.peek(cueBase + c * CUE_SIZE + k) & 0xFF
|
||
audio.uploadCue(c, cueBytes)
|
||
}
|
||
|
||
// -- 8. Configure playhead ------------------------------------------------
|
||
audio.setTrackerMode(targetPlaydataSlot)
|
||
audio.setBPM(targetPlaydataSlot, bpm)
|
||
audio.setTickRate(targetPlaydataSlot, tickRate > 0 ? tickRate : 6)
|
||
|
||
|
||
fileHandle.close()
|
||
sys.free(filePtr)
|
||
}
|
||
|
||
// ── captureTrackerDataToFile ────────────────────────────────────────────────
|
||
|
||
/**
|
||
* Dump the current tracker hardware state (sample bin, instruments, patterns
|
||
* in bank 0, cue sheet) to a single-song Taud file. BPM and tick-rate are
|
||
* taken from playhead 0.
|
||
*
|
||
* @param outFile Full path with drive letter, e.g. "A:/music/out.taud"
|
||
*/
|
||
function captureTrackerDataToFile(outFile) {
|
||
const drive = outFile[0].toUpperCase()
|
||
const diskPath = outFile.substring(2)
|
||
|
||
const memBase = audio.getMemAddr()
|
||
const baseAddr = audio.getBaseAddr()
|
||
|
||
// -- 1. Compress sample+instrument bin ------------------------------------
|
||
// sys.memcpy(negative_src, positive_dst, len) copies peripheral byte k from
|
||
// (memBase - k) into (sampleInstBuf + k).
|
||
let sampleInstBuf = sys.malloc(SAMPLEINST_SIZE)
|
||
sys.memcpy(memBase, sampleInstBuf, SAMPLEINST_SIZE)
|
||
|
||
let compBuf = sys.malloc(SAMPLEINST_SIZE + 4096) // headroom for incompressible data
|
||
let compressedSize = gzip.compFromTo(sampleInstBuf, SAMPLEINST_SIZE, compBuf)
|
||
sys.free(sampleInstBuf)
|
||
|
||
// -- 2. Find last non-empty pattern in bank 0 (all-zero = uninitialized) --
|
||
let numPatsActual = 0
|
||
outer: for (let p = NUM_PATTERNS_MAX - 1; p >= 0; p--) {
|
||
let patBase = 131072 + p * PATTERN_SIZE // offset within peripheral memory space
|
||
for (let k = 0; k < PATTERN_SIZE; k++) {
|
||
if ((sys.peek(memBase - (patBase + k)) & 0xFF) !== 0) {
|
||
numPatsActual = p + 1
|
||
break outer
|
||
}
|
||
}
|
||
}
|
||
if (numPatsActual === 0) numPatsActual = 1 // always emit at least one pattern slot
|
||
|
||
let numPats = numPatsActual // Uint16, 1-65535
|
||
let patsToSave = numPatsActual
|
||
|
||
// -- 3. BPM / tick-rate from playhead 0 -----------------------------------
|
||
let bpm = audio.getBPM(0) || 125
|
||
let tickRate = audio.getTickRate(0) || 6
|
||
let bpmStored = (bpm - 24) & 0xFF
|
||
|
||
// -- 4. Compute song offset (absolute from file start) --------------------
|
||
// Layout: header(32) + compressed(compressedSize) + songTable(1 × TAUD_SONG_ENTRY)
|
||
let songOffset = TAUD_HEADER_SIZE + compressedSize + 1 * TAUD_SONG_ENTRY
|
||
|
||
// -- 5. Build header byte array (32 bytes) --------------------------------
|
||
let sigBytes = new Array(16)
|
||
for (let i = 0; i < 16; i++)
|
||
sigBytes[i] = i < CAPTURE_SIGNATURE.length ? CAPTURE_SIGNATURE.charCodeAt(i) : 0
|
||
|
||
let header = [
|
||
// Magic (8)
|
||
0x1F, 0x54, 0x53, 0x56, 0x4D, 0x61, 0x75, 0x64,
|
||
// version, numSongs
|
||
TAUD_VERSION, 1,
|
||
// compressedSize uint32 LE (4)
|
||
(compressedSize ) & 0xFF,
|
||
(compressedSize >>> 8) & 0xFF,
|
||
(compressedSize >>> 16) & 0xFF,
|
||
(compressedSize >>> 24) & 0xFF,
|
||
// reserved (2)
|
||
0x00, 0x00,
|
||
].concat(sigBytes) // 8 + 2 + 4 + 2 + 16 = 32 bytes
|
||
|
||
// -- 6. Build song-table row (16 bytes) -----------------------------------
|
||
let songTable = [
|
||
(songOffset ) & 0xFF,
|
||
(songOffset >>> 8) & 0xFF,
|
||
(songOffset >>> 16) & 0xFF,
|
||
(songOffset >>> 24) & 0xFF,
|
||
20, // numVoices
|
||
numPats & 0xFF, (numPats >>> 8) & 0xFF, // numPatterns Uint16 LE
|
||
bpmStored, // BPM with −24 bias
|
||
tickRate, // initial tick-rate
|
||
0,0,0,0,0,0,0, // 7 bytes padding
|
||
]
|
||
|
||
// -- 7. Write header (creates / truncates file) ---------------------------
|
||
const fileHandle = files.open(outFile)
|
||
fileHandle.bwrite(header)
|
||
|
||
// -- 8. Append compressed sample+inst bin ---------------------------------
|
||
fileHandle.pwrite(compBuf, compressedSize, 32)
|
||
sys.free(compBuf)
|
||
|
||
// -- 9. Write song table --------------------------------------------------
|
||
fileHandle.bwrite(songTable)
|
||
|
||
// -- 10. Append pattern bin -----------------------------------------------
|
||
let patBuf = sys.malloc(patsToSave * PATTERN_SIZE)
|
||
sys.memcpy(memBase - 131072, patBuf, patsToSave * PATTERN_SIZE)
|
||
fileHandle.pwrite(patBuf, patsToSave * PATTERN_SIZE, 32 + compressedSize + songTable.length)
|
||
sys.free(patBuf)
|
||
|
||
// -- 11. Append cue sheet (all 1024 entries from MMIO space) --------------
|
||
// Cue entry c, byte k is at MMIO address 32768 + c*32 + k,
|
||
// accessed as sys.peek(baseAddr − (32768 + c*32 + k)).
|
||
let cueBuf = sys.malloc(NUM_CUES * CUE_SIZE)
|
||
for (let c = 0; c < NUM_CUES; c++) {
|
||
let cueOff = 32768 + c * CUE_SIZE
|
||
for (let k = 0; k < CUE_SIZE; k++)
|
||
sys.poke(cueBuf + c * CUE_SIZE + k,
|
||
sys.peek(baseAddr - (cueOff + k)) & 0xFF)
|
||
}
|
||
fileHandle.pwrite(cueBuf, NUM_CUES * CUE_SIZE, 32 + compressedSize + songTable.length + patsToSave * PATTERN_SIZE)
|
||
sys.free(cueBuf)
|
||
|
||
|
||
fileHandle.flush(); fileHandle.close()
|
||
}
|
||
|
||
exports = { uploadTaudFile, captureTrackerDataToFile }
|