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taud Ixmp extension, doc cleanup

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minjaesong
2026-05-31 14:49:41 +09:00
parent 038db60b59
commit 3362a6b732
8 changed files with 764 additions and 124 deletions
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50
assets/disk0/tvdos/include/taud.mjs
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@@ -83,11 +83,13 @@ function uploadTaudFile(inFile, songIndex, playhead) {
pos = 8
// -- 3. Parse header ------------------------------------------------------
// version(1) + numSongs(1) + compressedSize(4) + rsvd(2) + signature(16) = 24 bytes
// magic(8) + version(1) + numSongs(1) + compSize(4) + projOff(4) + signature(14)
// = 32 bytes (terranmon.txt §Header).
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)
let projOff = _peekU32LE(filePtr, pos); pos += 4
pos += 14 // signature
// pos == 32 == TAUD_HEADER_SIZE
if (songIndex < 0 || songIndex >= numSongs) {
@@ -155,6 +157,50 @@ function uploadTaudFile(inFile, songIndex, playhead) {
audio.setSongGlobalVolume(playhead, songGlobalVolume)
audio.setSongMixingVolume(playhead, songMixingVolume)
// -- 9. Project Data — walk Ixmp blocks for multi-sample instruments -----
// Terranmon spec: Project Data starts at `projOff` (zero = absent), magic is
// \x1ETaudPrJ + 8 reserved bytes, then a stream of FourCC + Uint32-length
// sections. We only consume "Ixmp" here; other sections (PNam, INam, sMet,
// etc.) are skipped so the player apps remain free to parse them.
if (projOff !== 0 && projOff + 16 <= fileSize) {
const projMagic = [0x1E,0x54,0x61,0x75,0x64,0x50,0x72,0x4A] // \x1ETaudPrJ
let prjOk = true
for (let i = 0; i < 8; i++) {
if ((sys.peek(filePtr + projOff + i) & 0xFF) !== projMagic[i]) { prjOk = false; break }
}
if (prjOk) {
const PATCH_SIZE = 31
let p = projOff + 16 // skip magic(8) + reserved(8)
while (p + 8 <= fileSize) {
const fc = String.fromCharCode(
sys.peek(filePtr + p) & 0xFF, sys.peek(filePtr + p + 1) & 0xFF,
sys.peek(filePtr + p + 2) & 0xFF, sys.peek(filePtr + p + 3) & 0xFF)
const secLen = _peekU32LE(filePtr, p + 4)
const payload = p + 8
if (payload + secLen > fileSize) break
if (fc === 'Ixmp') {
// Each entry: Uint8 instId + Uint24 patchCount + (patchCount × PATCH_SIZE) bytes.
let q = payload
const qEnd = payload + secLen
while (q + 4 <= qEnd) {
const instId = sys.peek(filePtr + q) & 0xFF; q++
const cntLo = sys.peek(filePtr + q) & 0xFF; q++
const cntMid = sys.peek(filePtr + q) & 0xFF; q++
const cntHi = sys.peek(filePtr + q) & 0xFF; q++
const patchCnt = cntLo | (cntMid << 8) | (cntHi << 16)
const blobLen = patchCnt * PATCH_SIZE
if (q + blobLen > qEnd) break
let buf = new Array(blobLen)
for (let k = 0; k < blobLen; k++) buf[k] = sys.peek(filePtr + q + k) & 0xFF
audio.uploadInstrumentPatches(instId, buf)
q += blobLen
}
}
p = payload + secLen
}
}
}
fileHandle.close()
sys.free(filePtr)