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TAV: videotex mode; TSVM documentation fix

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minjaesong
2025-11-21 16:53:35 +09:00
parent a61a21d28b
commit 2533b2dc19
7 changed files with 794 additions and 22 deletions
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34
assets/disk0/tvdos/bin/playtav.js
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@@ -37,6 +37,7 @@ const TAV_PACKET_AUDIO_ADPCM = 0x23
const TAV_PACKET_AUDIO_TAD = 0x24
const TAV_PACKET_SUBTITLE = 0x30 // Legacy SSF (frame-locked)
const TAV_PACKET_SUBTITLE_TC = 0x31 // SSF-TC (timecode-based)
const TAV_PACKET_VIDEOTEX = 0x3F // Videotex (text-mode video)
const TAV_PACKET_AUDIO_BUNDLED = 0x40 // Entire MP2 audio file in single packet
const TAV_PACKET_EXTENDED_HDR = 0xEF
const TAV_PACKET_SCREEN_MASK = 0xF2 // Screen masking (letterbox/pillarbox)
@@ -1614,6 +1615,38 @@ try {
let packetSize = seqread.readInt()
parseSubtitlePacketTC(packetSize)
}
else if (packetType === TAV_PACKET_VIDEOTEX) {
// Videotex packet (0x3F) - text-mode video
let compressedSize = seqread.readInt()
// Read compressed data
let compressedPtr = seqread.readBytes(compressedSize)
// Decompress with Zstd
// Allocate buffer for decompressed data (max: 2 + 80*32*3 = 7682 bytes)
let decompressedPtr = sys.malloc(8192)
let decompressedSize = gzip.decompFromTo(compressedPtr, compressedSize, decompressedPtr)
// Read grid dimensions from first 2 bytes
let rows = sys.peek(decompressedPtr)
let cols = sys.peek(decompressedPtr + 1)
let gridSize = rows * cols
// Calculate array offsets within decompressed data
let dataOffset = decompressedPtr + 2
// Copy arrays directly to graphics adapter memory
// Format: [fg-array][bg-array][char-array]
// Each array is gridSize bytes (typically 2560 for 80×32)
sys.memcpy(dataOffset, -1302529, gridSize * 3)
// Free buffers
sys.free(compressedPtr)
sys.free(decompressedPtr)
// Mark frame as ready
iframeReady = true
}
else if (packetType === TAV_PACKET_EXTENDED_HDR) {
// Extended header packet - metadata key-value pairs
let numPairs = seqread.readShort()
@@ -2178,6 +2211,7 @@ try {
}
catch (e) {
serial.printerr(`TAV decode error: ${e}`)
e.printStackTrace()
errorlevel = 1
}
finally {