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TAV: packet inspector

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This commit is contained in:
minjaesong
2025-10-14 01:25:16 +09:00
parent 4c48d761b9
commit 871d7bcdfe
4 changed files with 713 additions and 10 deletions
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73
assets/disk0/tvdos/bin/playtav.js
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@@ -27,6 +27,8 @@ const TAV_PACKET_IFRAME = 0x10
const TAV_PACKET_PFRAME = 0x11
const TAV_PACKET_AUDIO_MP2 = 0x20
const TAV_PACKET_SUBTITLE = 0x30
const TAV_PACKET_EXTENDED_HDR = 0xEF
const TAV_PACKET_TIMECODE = 0xFD
const TAV_PACKET_SYNC_NTSC = 0xFE
const TAV_PACKET_SYNC = 0xFF
const TAV_FILE_HEADER_FIRST = 0x1F
@@ -1005,7 +1007,76 @@ try {
// Subtitle packet - same format as TEV
let packetSize = seqread.readInt()
processSubtitlePacket(packetSize)
} else if (packetType == 0x00) {
}
else if (packetType === TAV_PACKET_EXTENDED_HDR) {
// Extended header packet - metadata key-value pairs
let numPairs = seqread.readShort()
if (interactive) {
serial.println(`[EXTENDED HEADER] ${numPairs} key-value pairs:`)
}
for (let i = 0; i < numPairs; i++) {
// Read key (4 bytes)
let keyBytes = seqread.readBytes(4)
let key = ""
for (let j = 0; j < 4; j++) {
key += String.fromCharCode(sys.peek(keyBytes + j))
}
sys.free(keyBytes)
// Read value type
let valueType = seqread.readOneByte()
if (valueType === 0x04) { // Uint64
let valueLow = seqread.readInt()
let valueHigh = seqread.readInt()
// Combine into 64-bit value (JS uses double, loses precision beyond 2^53)
let value = valueHigh * 0x100000000 + (valueLow >>> 0)
if (interactive) {
if (key === "CDAT") {
// Creation date - convert to human readable
let seconds = Math.floor(value / 1000000000)
let date = new Date(seconds * 1000)
serial.println(` ${key}: ${date.toISOString()}`)
} else {
// BGNT/ENDT - show as seconds
serial.println(` ${key}: ${(value / 1000000000).toFixed(6)}s`)
}
}
} else if (valueType === 0x10) { // Bytes
let length = seqread.readShort()
let dataBytes = seqread.readBytes(length)
let dataStr = ""
for (let j = 0; j < length; j++) {
dataStr += String.fromCharCode(sys.peek(dataBytes + j))
}
sys.free(dataBytes)
if (interactive) {
serial.println(` ${key}: "${dataStr}"`)
}
} else {
if (interactive) {
serial.println(` ${key}: Unknown type 0x${valueType.toString(16)}`)
}
}
}
}
else if (packetType === TAV_PACKET_TIMECODE) {
// Timecode packet - time since stream start in nanoseconds
let timecodeLow = seqread.readInt()
let timecodeHigh = seqread.readInt()
let timecodeNs = timecodeHigh * 0x100000000 + (timecodeLow >>> 0)
// Optionally display timecode in interactive mode (can be verbose)
// Uncomment for debugging:
// if (interactive && frameCount % 60 === 0) {
// serial.println(`[TIMECODE] Frame ${frameCount}: ${(timecodeNs / 1000000000).toFixed(6)}s`)
// }
}
else if (packetType == 0x00) {
// Silently discard, faulty subtitle creation can cause this as 0x00 is used as an argument terminator
} else {
println(`Unknown packet type: 0x${packetType.toString(16)}`)