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TAV: EZBC on the header

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minjaesong
2025-10-20 18:53:40 +09:00
parent 9553b281af
commit f0ad0ef034
4 changed files with 58 additions and 94 deletions
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16
assets/disk0/tvdos/bin/playtav.js
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@@ -253,6 +253,7 @@ let header = {
videoFlags: 0,
qualityLevel: 0,
channelLayout: 0,
entropyCoder: 0, // 0 = Twobit-map, 1 = EZBC
fileRole: 0
}
@@ -290,10 +291,12 @@ header.extraFlags = seqread.readOneByte()
header.videoFlags = seqread.readOneByte()
header.qualityLevel = seqread.readOneByte() // the decoder expects biased value
header.channelLayout = seqread.readOneByte()
header.fileRole = seqread.readOneByte()
header.entropyCoder = seqread.readOneByte()
// Skip reserved bytes
seqread.skip(4)
// Skip reserved bytes (2) and device orientation (1)
seqread.skip(3)
header.fileRole = seqread.readOneByte()
if (header.version < 1 || header.version > 8) {
printerrln(`Error: Unsupported TAV version ${header.version}`)
@@ -336,6 +339,7 @@ console.log(`Wavelet filter: ${header.waveletFilter === WAVELET_5_3_REVERSIBLE ?
console.log(`Decomposition levels: ${header.decompLevels}`)
console.log(`Quality: Y=${QLUT[header.qualityY]}, Co=${QLUT[header.qualityCo]}, Cg=${QLUT[header.qualityCg]}`)
console.log(`Channel layout: ${getChannelLayoutName(header.channelLayout)}`)
console.log(`Entropy coder: ${header.entropyCoder === 0 ? "Twobit-map" : header.entropyCoder === 1 ? "EZBC" : "Unknown"}`)
console.log(`Tiles: ${tilesX}x${tilesY} (${numTiles} total)`)
console.log(`Colour space: ${header.version % 2 == 0 ? "ICtCp" : "YCoCg-R"}`)
console.log(`Features: ${hasAudio ? "Audio " : ""}${hasSubtitles ? "Subtitles " : ""}${progressiveTransmission ? "Progressive " : ""}${roiCoding ? "ROI " : ""}`)
@@ -919,7 +923,8 @@ try {
header.waveletFilter, // TAV-specific parameter
header.decompLevels, // TAV-specific parameter
isLossless,
header.version // TAV version for colour space detection
header.version, // TAV version for colour space detection
header.entropyCoder // Entropy coder: 0 = Twobit-map, 1 = EZBC
)
decodeTime = (sys.nanoTime() - decodeStart) / 1000000.0
@@ -1074,7 +1079,8 @@ try {
header.channelLayout,
header.waveletFilter,
header.decompLevels,
2 // temporalLevels (hardcoded for now, could be in header)
2, // temporalLevels (hardcoded for now, could be in header)
header.entropyCoder // Entropy coder: 0 = Twobit-map, 1 = EZBC
)
const framesDecoded = r1