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NTSC framerate detection

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This commit is contained in:
minjaesong
2025-09-03 11:08:37 +09:00
parent e73aa3da28
commit c89b977e91
4 changed files with 198 additions and 35 deletions
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63
assets/disk0/tvdos/bin/playtev.js
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@@ -2,6 +2,7 @@
// TSVM Enhanced Video (TEV) Format Decoder - YCoCg-R 4:2:0 Version
// Usage: playtev moviefile.tev [options]
// Options: -i (interactive), -debug-mv (show motion vector debug visualization)
// -deinterlace=algorithm (yadif or bwdif, default: yadif)
const WIDTH = 560
const HEIGHT = 448
@@ -41,6 +42,7 @@ let subtitlePosition = 0 // 0=bottom center (default)
const interactive = exec_args[2] && exec_args[2].toLowerCase() == "-i"
const debugMotionVectors = exec_args[2] && exec_args[2].toLowerCase() == "-debug-mv"
const deinterlaceAlgorithm = "yadif"
const fullFilePath = _G.shell.resolvePathInput(exec_args[1])
const FILE_LENGTH = files.open(fullFilePath.full).size
@@ -387,12 +389,13 @@ let hasAudio = !!(flags & 1)
let hasSubtitle = !!(flags & 2)
let videoFlags = seqread.readOneByte()
let isInterlaced = !!(videoFlags & 1)
let isNTSC = !!(videoFlags & 2)
let unused2 = seqread.readOneByte()
serial.println(`Video metadata:`)
serial.println(` Frames: ${totalFrames}`)
serial.println(` FPS: ${fps}`)
serial.println(` FPS: ${(isNTSC) ? (fps * 1000 / 1001) : fps}`)
serial.println(` Duration: ${totalFrames / fps}`)
serial.println(` Audio: ${hasAudio ? "Yes" : "No"}`)
serial.println(` Resolution: ${width}x${height}, ${isInterlaced ? "interlaced" : "progressive"}`)
@@ -460,6 +463,7 @@ sys.memset(DISPLAY_RG_ADDR, 0, FRAME_PIXELS) // Black in RG plane
sys.memset(DISPLAY_BA_ADDR, 15, FRAME_PIXELS) // Black with alpha=15 (opaque) in BA plane
let frameCount = 0
let trueFrameCount = 0
let stopPlay = false
let akku = FRAME_TIME
let akku2 = 0.0
@@ -537,10 +541,12 @@ function rotateFieldBuffers() {
nextFieldAddr = temp
}
let frameDuped = false
// Main decoding loop - simplified for performance
try {
let t1 = sys.nanoTime()
while (!stopPlay && seqread.getReadCount() < FILE_LENGTH && frameCount < totalFrames) {
while (!stopPlay && seqread.getReadCount() < FILE_LENGTH && trueFrameCount < totalFrames) {
// Handle interactive controls
if (interactive) {
@@ -560,6 +566,7 @@ try {
// Sync packet - frame complete
frameCount++
trueFrameCount++
// Swap ping-pong buffers instead of expensive memcpy (752KB copy eliminated!)
let temp = CURRENT_RGB_ADDR
@@ -603,29 +610,39 @@ try {
// Hardware-accelerated TEV decoding to RGB buffers (YCoCg-R or XYB based on version)
try {
let decodeStart = sys.nanoTime()
let decodingHeight = isInterlaced ? (height / 2)|0 : height
if (isInterlaced) {
// For interlaced: decode current frame into currentFieldAddr
// For display: use prevFieldAddr as current, currentFieldAddr as next
graphics.tevDecode(blockDataPtr, nextFieldAddr, currentFieldAddr, width, decodingHeight, [qualityY, qualityCo, qualityCg], frameCount, debugMotionVectors, version)
graphics.tevDeinterlace(frameCount, width, decodingHeight, prevFieldAddr, currentFieldAddr, nextFieldAddr, CURRENT_RGB_ADDR)
// duplicate every 1000th frame (pass a turn every 1000n+501st) if NTSC
if (!isInterlaced || frameCount % 1000 != 501 || frameDuped) {
frameDuped = false
// Rotate field buffers for next frame: NEXT -> CURRENT -> PREV
rotateFieldBuffers()
} else {
// Progressive or first frame: normal decoding without temporal prediction
graphics.tevDecode(blockDataPtr, CURRENT_RGB_ADDR, PREV_RGB_ADDR, width, decodingHeight, [qualityY, qualityCo, qualityCg], frameCount, debugMotionVectors, version)
let decodeStart = sys.nanoTime()
let decodingHeight = isInterlaced ? (height / 2)|0 : height
if (isInterlaced) {
// For interlaced: decode current frame into currentFieldAddr
// For display: use prevFieldAddr as current, currentFieldAddr as next
graphics.tevDecode(blockDataPtr, nextFieldAddr, currentFieldAddr, width, decodingHeight, [qualityY, qualityCo, qualityCg], trueFrameCount, debugMotionVectors, version)
graphics.tevDeinterlace(trueFrameCount, width, decodingHeight, prevFieldAddr, currentFieldAddr, nextFieldAddr, CURRENT_RGB_ADDR, deinterlaceAlgorithm)
// Rotate field buffers for next frame: NEXT -> CURRENT -> PREV
rotateFieldBuffers()
} else {
// Progressive or first frame: normal decoding without temporal prediction
graphics.tevDecode(blockDataPtr, CURRENT_RGB_ADDR, PREV_RGB_ADDR, width, decodingHeight, [qualityY, qualityCo, qualityCg], trueFrameCount, debugMotionVectors, version)
}
decodeTime = (sys.nanoTime() - decodeStart) / 1000000.0 // Convert to milliseconds
// Upload RGB buffer to display framebuffer with dithering
let uploadStart = sys.nanoTime()
graphics.uploadRGBToFramebuffer(CURRENT_RGB_ADDR, width, height, frameCount)
uploadTime = (sys.nanoTime() - uploadStart) / 1000000.0 // Convert to milliseconds
}
else {
frameCount -= 1
frameDuped = true
serial.println(`Frame ${frameCount}: Duplicating previous frame`)
}
decodeTime = (sys.nanoTime() - decodeStart) / 1000000.0 // Convert to milliseconds
// Upload RGB buffer to display framebuffer with dithering
let uploadStart = sys.nanoTime()
graphics.uploadRGBToFramebuffer(CURRENT_RGB_ADDR, width, height, frameCount)
uploadTime = (sys.nanoTime() - uploadStart) / 1000000.0 // Convert to milliseconds
// Defer audio playback until a first frame is sent
if (isInterlaced) {