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first working (and crappy) video delta encoding

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This commit is contained in:
minjaesong
2025-04-18 21:00:46 +09:00
parent 4c4f24be37
commit d9af28eed2
5 changed files with 398 additions and 105 deletions
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58
assets/disk0/tvdos/bin/playmov.js
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@@ -122,6 +122,8 @@ while (!stopPlay && seqread.getReadCount() < FILE_LENGTH) {
frameUnit += 1
}
if (frameUnit > 1) frameUnit = 1 // comment to enable frameskip
if (frameUnit != 0) {
// skip frames if necessary
while (!stopPlay && frameUnit >= 1 && seqread.getReadCount() < FILE_LENGTH) {
@@ -210,6 +212,62 @@ while (!stopPlay && seqread.getReadCount() < FILE_LENGTH) {
sys.free(gzippedPtr)
}
// iPF1d
else if (packetType == 516) {
let payloadLen = seqread.readInt()
if (framesRead >= FRAME_COUNT) {
break renderLoop
}
framesRead += 1
let gzippedPtr = seqread.readBytes(payloadLen)
framesRendered += 1
if (frameUnit == 1) {
gzip.decompFromTo(gzippedPtr, payloadLen, ipfbuf) // should return FBUF_SIZE
graphics.applyIpf1d(ipfbuf, -1048577, -1310721, width, height)
// defer audio playback until a first frame is sent
if (!audioFired) {
audio.play(0)
audioFired = true
}
// calculate bgcolour from the edges of the screen
if (AUTO_BGCOLOUR_CHANGE) {
let samples = []
for (let x = 8; x < 560; x+=32) {
samples.push(getRGBfromScr(x, 3))
samples.push(getRGBfromScr(x, 445))
}
for (let y = 29; y < 448; y+=26) {
samples.push(getRGBfromScr(8, y))
samples.push(getRGBfromScr(552, y))
}
let out = [0.0, 0.0, 0.0]
samples.forEach(rgb=>{
out[0] += rgb[0]
out[1] += rgb[1]
out[2] += rgb[2]
})
out[0] = out[0] / samples.length / 2.0 // darken a bit
out[1] = out[1] / samples.length / 2.0
out[2] = out[2] / samples.length / 2.0
let bgr = (oldBgcol[0]*5 + out[0]) / 6.0
let bgg = (oldBgcol[1]*5 + out[1]) / 6.0
let bgb = (oldBgcol[2]*5 + out[2]) / 6.0
oldBgcol = [bgr, bgg, bgb]
graphics.setBackground(Math.round(bgr * 255), Math.round(bgg * 255), Math.round(bgb * 255))
}
}
sys.free(gzippedPtr)
}
else {
throw Error(`Unknown Video Packet with type ${packetType} at offset ${seqread.getReadCount() - 2}`)
}