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tev format working with better motion compensation

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minjaesong
2025-08-21 20:52:27 +09:00
parent 66e0d1f5bc
commit f783ef934f
3 changed files with 199 additions and 82 deletions
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24
assets/disk0/tvdos/bin/playtev.js
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@@ -1,6 +1,7 @@
// Created by Claude on 2025-08-18.
// 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)
const WIDTH = 560
const HEIGHT = 448
@@ -21,6 +22,7 @@ const TEV_PACKET_AUDIO_MP2 = 0x20
const TEV_PACKET_SYNC = 0xFF
const interactive = exec_args[2] && exec_args[2].toLowerCase() == "-i"
const debugMotionVectors = exec_args[2] && exec_args[2].toLowerCase() == "-debug-mv"
const fullFilePath = _G.shell.resolvePathInput(exec_args[1])
const FILE_LENGTH = files.open(fullFilePath.full).size
@@ -102,8 +104,7 @@ function getVideoRate(rate) {
return baseRate * mult
}
let frameTime = 1.0 / fps
let FRAME_TIME = 1.0 / fps
// Ultra-fast approach: always render to display, use dedicated previous frame buffer
const FRAME_PIXELS = width * height
@@ -133,6 +134,7 @@ sys.memset(DISPLAY_BA_ADDR, 15, FRAME_PIXELS) // Black with alpha=15 (opaque) in
let frameCount = 0
let stopPlay = false
let akku = FRAME_TIME
// 4x4 Bayer dithering matrix
const BAYER_MATRIX = [
@@ -142,6 +144,7 @@ const BAYER_MATRIX = [
[15, 7,13, 5]
]
// Apply Bayer dithering to reduce banding when quantizing to 4-bit
function ditherValue(value, x, y) {
// Get the dither threshold for this pixel position
@@ -157,7 +160,11 @@ function ditherValue(value, x, y) {
// Main decoding loop - simplified for performance
try {
let t1 = sys.nanoTime()
while (!stopPlay && seqread.getReadCount() < FILE_LENGTH && frameCount < totalFrames) {
if (akku >= FRAME_TIME) {
// Handle interactive controls
if (interactive) {
sys.poke(-40, 1)
@@ -175,7 +182,7 @@ try {
frameCount++
// Copy current RGB frame to previous frame buffer for next frame reference
// This is the only copying we need, and it happens once per frame after display
// memcpy(source, destination, length) - so CURRENT (source) -> PREV (destination)
sys.memcpy(CURRENT_RGB_ADDR, PREV_RGB_ADDR, FRAME_PIXELS * 3)
} else if (packetType == TEV_PACKET_IFRAME || packetType == TEV_PACKET_PFRAME) {
@@ -214,8 +221,7 @@ try {
// Hardware-accelerated TEV YCoCg-R decoding to RGB buffers
try {
graphics.tevDecode(blockDataPtr, CURRENT_RGB_ADDR, PREV_RGB_ADDR, width, height, quality)
// graphics.tevDecode(blockDataPtr, CURRENT_RGB_ADDR, PREV_RGB_ADDR, width, height, 0) // force quality 0 for testing
graphics.tevDecode(blockDataPtr, CURRENT_RGB_ADDR, PREV_RGB_ADDR, width, height, quality, debugMotionVectors)
// Upload RGB buffer to display framebuffer with dithering
graphics.uploadRGBToFramebuffer(CURRENT_RGB_ADDR, DISPLAY_RG_ADDR, DISPLAY_BA_ADDR,
@@ -236,6 +242,12 @@ try {
println(`Unknown packet type: 0x${packetType.toString(16)}`)
break
}
}
sys.sleep(1)
let t2 = sys.nanoTime()
akku += (t2 - t1) / 1000000000.0
// Simple progress display
if (interactive) {
@@ -247,6 +259,8 @@ try {
print(`VRate: ${(getVideoRate() / 1024 * 8)|0} kbps `)
con.move(1, 1)
}
t1 = t2
}
} catch (e) {