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taud: extended tempo range

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minjaesong
2026-06-20 04:00:33 +09:00
parent 1173373789
commit 6eb73355ca
11 changed files with 101 additions and 49 deletions
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10
assets/disk0/tvdos/include/taud.mjs
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@@ -139,7 +139,9 @@ function uploadTaudFile(inFile, songIndex, playhead) {
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 tickPacked = sys.peek(filePtr + entryOff + 8) & 0xFF
let tickRate = tickPacked & 0x7F // bits 0..6
bpmStored |= (tickPacked & 0x80) << 1 // bit 7 of byte 8 = BPM high bit (0x100..0x1FE)
let mixerflags = sys.peek(filePtr + entryOff + 15) & 0xFF
let songGlobalVolume = sys.peek(filePtr + entryOff + 16) & 0xFF
let songMixingVolume = sys.peek(filePtr + entryOff + 17) & 0xFF
@@ -299,7 +301,7 @@ function captureTrackerDataToFile(outFile) {
// -- 3. BPM / tick-rate / volumes from playhead 0 -------------------------
let bpm = audio.getBPM(0) || 125
let tickRate = audio.getTickRate(0) || 6
let bpmStored = (bpm - 25) & 0xFF
let bpmStored = Math.max(0, Math.min(0x1FE, bpm - 25)) // 9-bit (0..510 ⇒ BPM 25..535)
let songGlobalVolume = audio.getSongGlobalVolume(0)
let songMixingVolume = audio.getSongMixingVolume(0)
if (songGlobalVolume === undefined || songGlobalVolume === null) songGlobalVolume = 0x80
@@ -393,8 +395,8 @@ function captureTrackerDataToFile(outFile) {
(songOffset >>> 24) & 0xFF,
20, // numVoices
numPats & 0xFF, (numPats >>> 8) & 0xFF, // numPatterns Uint16 LE
bpmStored, // BPM with −25 bias
tickRate, // initial tick-rate
bpmStored & 0xFF, // BPM with −25 bias (low 8 bits)
(((bpmStored >> 8) & 1) << 7) | (tickRate & 0x7F), // bit 7 = BPM high bit; bits 0..6 = tick-rate
0x00,0xA0, // basenote (0xA000 -- C9)
0x00,0xAC,0x02,0x46, // basefreq (8363 Hz)
sys.peek(baseAddr - 7), // mixer flags