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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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21
assets/disk0/tvdos/include/mediadec.mjs
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@@ -7,21 +7,30 @@
* const mediadec = require("mediadec")
* const dec = mediadec.open("A:\\film.tav", { interactive: true })
* while (true) {
* const ev = dec.step() // [backend] decode the next due frame
* const ev = dec.step() // [backend] decode the next due frame to RAM
* if (ev.type === 'eof') break
* if (ev.type !== 'frame') { sys.sleep(1); continue }
* dec.blit() // [draw] copy the frame to the screen
* // ...or in ASCII mode: dec.blit(); dec.sampleGray(buf,w,h); aa.render/flush
* dec.blit() // [draw] upload the RAM frame to the screen
* // ...or in ASCII mode (no upload): dec.sampleGray(buf,w,h); aa.render/flush
* // ...or grab the frame yourself: sys.peek(dec.frameBuffer + ...)
* }
* dec.close()
*
* step() decodes the next due frame into a generic RAM RGB888 buffer (exposed as
* .frameBuffer); the caller decides what to do with it — upload it with .blit(),
* sample it for ASCII, or read it directly. (iPF is the exception: it decodes
* straight to the 4bpp display planes, so .frameBuffer is 0 and .sampleGray/.blit
* operate on the planes — see mediadec_ipf.mjs.)
*
* The decoder object every backend returns exposes a uniform interface:
* .info {format,width,height,fps,totalFrames,hasAudio,hasSubtitles,
* isInterlaced,colourSpace,graphicsMode,isStill}
* .step() -> { type:'frame'|'idle'|'eof'|'newfile'|'error', frameCount }
* .blit() present the current native frame to the screen
* .sampleGray(dst,w,h) fill an ASCII brightness buffer from the framebuffer
* .sampleColour(dst,w,h) fill a per-cell RGB buffer (w*h*3) from the framebuffer
* .frameBuffer RAM RGB888 address of the current frame (0 for iPF; see above)
* .frameWidth/.frameHeight dimensions of the frame in .frameBuffer
* .blit() upload the current RAM frame to the screen (adapter)
* .sampleGray(dst,w,h) fill an ASCII brightness buffer from the RAM frame
* .sampleColour(dst,w,h) fill a per-cell RGB buffer (w*h*3) from the RAM frame
* .subtitle {visible,text,position,useUnicode,dirty} (resolved by the lib)
* .pause(b)/.isPaused() .setVolume(v)/.getVolume()
* .seekSeconds(n) .cue(d) .cues