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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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22
assets/disk0/tvdos/include/mediadec_tev.mjs
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@@ -4,8 +4,9 @@
* Ported from assets/disk0/tvdos/bin/playtev.js. DCT codec, YCoCg-R / ICtCp,
* motion compensation, optional deblock / boundary-aware decoding, interlaced
* (yadif/bwdif) support, NTSC frame duplication, MP2 audio, SSF + SSF-TC
* subtitles. Decodes into an off-screen RGB888 ping-pong buffer; blit() uploads
* it (deferred from decode so the ASCII path can sample the same buffer).
* subtitles. Decodes into an off-screen RGB888 ping-pong buffer (the generic
* RAM frame): blit() uploads it to the adapter, while the ASCII path samples it
* straight from RAM, and `frameBuffer` exposes it for arbitrary reuse.
*/
const TEV_VERSION_YCOCG = 2
@@ -181,15 +182,16 @@ function create(magic, sr, fileLength, opts, common) {
}
}
// Present only; bias lighting is a separate, player-driven stage (bias() below).
// Present the decoded RAM frame to the display planes (with dithering).
// bias lighting is a separate, player-driven stage (bias() below).
function blit() {
graphics.uploadRGBToFramebuffer(currentFrameSrc, width, height, frameCount, false)
}
// Player calls blit() (which uploads currentFrameSrc) before sampleGray in
// ASCII mode, so we read the framebuffer the upload just produced.
function sampleGray(dst, w, h) { common.sampleGrayScreen(width, height, dst, w, h, 4) }
function sampleColour(dst, w, h) { common.sampleColourScreen(width, height, dst, w, h, 4) }
// The decoded frame already sits in currentFrameSrc (RGB888 RAM), so sampling
// reads RAM directly — ASCII mode needs no blit() / display-plane round-trip.
function sampleGray(dst, w, h) { common.sampleGrayRGB(currentFrameSrc, width, height, dst, w, h) }
function sampleColour(dst, w, h) { common.sampleColourRGB(currentFrameSrc, width, height, dst, w, h) }
return {
info: info,
@@ -201,6 +203,12 @@ function create(magic, sr, fileLength, opts, common) {
get qY() { return qualityY }, get qCo() { return qualityCo }, get qCg() { return qualityCg },
cues: [],
// Generic RAM frame: the current decoded frame as RGB888 (the live
// ping-pong buffer), valid after step() returns 'frame'. Callers may read it.
get frameBuffer() { return currentFrameSrc },
get frameWidth() { return width },
get frameHeight() { return height },
step: step,
blit: blit,
bias() { applyBias() },