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libmediadec: fb on ram

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minjaesong
2026-06-08 02:26:23 +09:00
parent e32f7565ba
commit ffc1d420cd
7 changed files with 230 additions and 53 deletions
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17
assets/disk0/tvdos/bin/playmov.js
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@@ -5,10 +5,11 @@
//
// loop:
// read input (quit / pause / seek / volume / cue / ASCII-toggle)
// [backend] dec.step() -> decode the next due frame into the framebuffer
// [backend] dec.step() -> decode the next due frame into a RAM RGB888 frame
// [player] hold the frame
// [postprocessor] subtitle state resolved by the library
// [draw] dec.blit() (graphics) OR sampleGray + aa.mjs (ASCII),
// [draw] graphics: dec.blit() (upload RAM frame to adapter) + dec.bias()
// ASCII: dec.sampleGray + aa.mjs straight off the RAM frame (no upload)
// then subtitle overlay + playgui chrome
//
// Usage: playmov FILE [-i] [-ascii] [-colour] [-deblock] [-boundaryaware]
@@ -234,6 +235,7 @@ try {
function enterAsciiVisual() {
ensureAscii()
graphics.setBackground(0, 0, 0)
graphics.clearPixelsAll(0, 0, 0, 0)
con.clear()
}
@@ -284,19 +286,20 @@ try {
lastKey = key
}
// ── Draw a decoded frame: framebuffer -> screen -> overlays -> chrome ──────
// ── Draw a decoded frame: RAM frame -> screen / ASCII -> overlays -> chrome ─
function draw() {
if (asciiMode) {
// Sample the frame off the framebuffer, then cover the picture with
// solid-black (240) text cells — cheaper than clearing the pixel planes.
dec.blit() // frame -> framebuffer (so sample* can read it)
// The decoded frame already sits in RAM (TEV/TAV) or on the display
// planes (iPF), so sample it WITHOUT uploading to the video adapter,
// then cover the picture with solid-black (240) text cells (cheaper
// than clearing the pixel planes).
dec.sampleGray(aaCtx.imagebuffer, aaCtx.imgW, aaCtx.imgH)
aa.render(aaCtx, aaParams)
aa.flush(aaCtx)
if (colourMode) applyColourFore(dec) // recolour the FG plane from the video's RGB
paintAsciiBgOpaque() // cover with opaque 240 (not transparent 255)
} else {
dec.blit() // copy the frame to the framebuffer
dec.blit() // upload the RAM frame to the video adapter
dec.bias() // bias lighting (player-owned stage; graphics only)
}