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working YCoCg-R variant

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This commit is contained in:
minjaesong
2025-08-19 11:28:40 +09:00
parent 70fda528e2
commit c1b911c7ad
5 changed files with 515 additions and 106 deletions
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24
assets/disk0/tvdos/bin/playtev.js
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@@ -186,8 +186,12 @@ const DISPLAY_RG_ADDR = -1048577 // Main graphics RG plane (displayed)
const DISPLAY_BA_ADDR = -1310721 // Main graphics BA plane (displayed)
// RGB frame buffers (24-bit: R,G,B per pixel)
const CURRENT_RGB_ADDR = sys.malloc(560*448*3) // Current frame RGB buffer
const PREV_RGB_ADDR = sys.malloc(560*448*3) // Previous frame RGB buffer
const FRAME_SIZE = 560*448*3 // Total frame size = 752,640 bytes
// Allocate frame buffers - malloc works correctly, addresses are start addresses
const CURRENT_RGB_ADDR = sys.malloc(FRAME_SIZE)
const PREV_RGB_ADDR = sys.malloc(FRAME_SIZE)
// Working memory for blocks (minimal allocation)
let ycocgWorkspace = sys.malloc(BLOCK_SIZE * BLOCK_SIZE * 3) // Y+Co+Cg workspace
@@ -252,15 +256,12 @@ try {
let packetType = seqread.readOneByte()
if (packetType == 0xFF) { // Sync packet
// Read length (should be 0)
let syncLen = seqread.readInt()
// Sync packet - frame complete
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
sys.memcpy(PREV_RGB_ADDR, CURRENT_RGB_ADDR, FRAME_PIXELS * 3)
sys.memcpy(CURRENT_RGB_ADDR, PREV_RGB_ADDR, FRAME_PIXELS * 3)
} else if (packetType == TEV_PACKET_IFRAME || packetType == TEV_PACKET_PFRAME) {
// Video frame packet
@@ -268,6 +269,7 @@ try {
let compressedPtr = seqread.readBytes(payloadLen)
updateDataRateBin(payloadLen)
// Basic sanity check on compressed data
if (payloadLen <= 0 || payloadLen > 1000000) {
serial.println(`Frame ${frameCount}: Invalid payload length: ${payloadLen}`)
@@ -297,9 +299,9 @@ 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, quality)
// graphics.tevDecode(blockDataPtr, CURRENT_RGB_ADDR, PREV_RGB_ADDR, width, height, 0) // force quality 0 for testing
// Upload RGB buffer to display framebuffer with dithering
graphics.uploadRGBToFramebuffer(CURRENT_RGB_ADDR, DISPLAY_RG_ADDR, DISPLAY_BA_ADDR,
width, height, frameCount)
@@ -339,8 +341,8 @@ try {
// Cleanup working memory (graphics memory is automatically managed)
sys.free(ycocgWorkspace)
sys.free(dctWorkspace)
sys.free(CURRENT_RGB_ADDR)
sys.free(PREV_RGB_ADDR)
if (CURRENT_RGB_ADDR > 0) sys.free(CURRENT_RGB_ADDR)
if (PREV_RGB_ADDR > 0) sys.free(PREV_RGB_ADDR)
audio.stop(0)
audio.purgeQueue(0)