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sequentially-read-a-file as js module
This commit is contained in:
minjaesong
@@ -1,116 +1,20 @@
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const FBUF_SIZE = 560*448
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const MAGIC = [0x1F, 0x54, 0x53, 0x56, 0x4D, 0x4D, 0x4F, 0x56]
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const port = _TVDOS.DRV.FS.SERIAL._toPorts("A")[0]
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const fullFilePath = _G.shell.resolvePathInput(exec_args[1])
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const FILE_LENGTH = files.open(fullFilePath.full).size
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serial.println(`Reading ${FILE_LENGTH} bytes...`)
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com.sendMessage(port, "DEVRST\x17")
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com.sendMessage(port, `OPENR"${fullFilePath.string}",1`)
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let statusCode = com.getStatusCode(port)
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if (statusCode != 0) {
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printerrln(`No such file (${statusCode})`)
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return statusCode
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}
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com.sendMessage(port, "READ")
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statusCode = com.getStatusCode(port)
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if (statusCode != 0) {
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printerrln("READ failed with "+statusCode)
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return statusCode
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}
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con.clear(); con.curs_set(0)
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let readCount = 0
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function readBytes(length, ptrToDecode) {
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let ptr = (ptrToDecode === undefined) ? sys.malloc(length) : ptrToDecode
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let requiredBlocks = Math.floor((readCount + length) / 4096) - Math.floor(readCount / 4096)
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let completedReads = 0
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//serial.println(`readBytes(${length}); readCount = ${readCount}`)
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for (let bc = 0; bc < requiredBlocks + 1; bc++) {
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if (completedReads >= length) break
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if (readCount % 4096 == 0) {
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//serial.println("READ from serial")
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// pull the actual message
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sys.poke(-4093 - port, 6);sys.sleep(0) // spinning is required as Graal run is desynced with the Java side
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let blockTransferStatus = ((sys.peek(-4085 - port*2) & 255) | ((sys.peek(-4086 - port*2) & 255) << 8))
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let thisBlockLen = blockTransferStatus & 4095
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if (thisBlockLen == 0) thisBlockLen = 4096 // [1, 4096]
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let hasMore = (blockTransferStatus & 0x8000 != 0)
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con.clear();con.curs_set(0)
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//serial.println(`block: (${thisBlockLen})[${[...Array(thisBlockLen).keys()].map(k => (sys.peek(-4097 - k) & 255).toString(16).padStart(2,'0')).join()}]`)
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let remaining = Math.min(thisBlockLen, length - completedReads)
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//serial.println(`Pulled a block (${thisBlockLen}); readCount = ${readCount}, completedReads = ${completedReads}, remaining = ${remaining}`)
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// copy from read buffer to designated position
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sys.memcpy(-4097, ptr + completedReads, remaining)
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// increment readCount properly
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readCount += remaining
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completedReads += remaining
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}
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else {
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let padding = readCount % 4096
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let remaining = length - completedReads
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let thisBlockLen = Math.min(4096 - padding, length - completedReads)
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//serial.println(`padding = ${padding}; remaining = ${remaining}`)
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//serial.println(`block: (${thisBlockLen})[${[...Array(thisBlockLen).keys()].map(k => (sys.peek(-4097 - padding - k) & 255).toString(16).padStart(2,'0')).join()}]`)
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//serial.println(`Reusing a block (${thisBlockLen}); readCount = ${readCount}, completedReads = ${completedReads}`)
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// copy from read buffer to designated position
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sys.memcpy(-4097 - padding, ptr + completedReads, thisBlockLen)
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// increment readCount properly
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readCount += thisBlockLen
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completedReads += thisBlockLen
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}
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}
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//serial.println(`END readBytes(${length}); readCount = ${readCount}\n`)
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return ptr
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}
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function readInt() {
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let b = readBytes(4)
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let i = (sys.peek(b) & 255) | ((sys.peek(b+1) & 255) << 8) | ((sys.peek(b+2) & 255) << 16) | ((sys.peek(b+3) & 255) << 24)
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//serial.println(`readInt(); bytes: ${sys.peek(b)}, ${sys.peek(b+1)}, ${sys.peek(b+2)}, ${sys.peek(b+3)} = ${i}\n`)
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sys.free(b)
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return i
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}
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function readShort() {
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let b = readBytes(2)
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let i = (sys.peek(b) & 255) | ((sys.peek(b+1) & 255) << 8)
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//serial.println(`readShort(); bytes: ${sys.peek(b)}, ${sys.peek(b+1)} = ${i}\n`)
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sys.free(b)
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return i
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}
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let seqread = require("seqread")
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seqread.prepare(fullFilePath.full)
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let magic = readBytes(8)
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let magic = seqread.readBytes(8)
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let magicMatching = true
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// check if magic number matches
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@@ -127,19 +31,19 @@ if (!magicMatching) {
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}
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let width = readShort()
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let height = readShort()
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let fps = readShort(); if (fps == 0) fps = 9999
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let width = seqread.readShort()
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let height = seqread.readShort()
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let fps = seqread.readShort(); if (fps == 0) fps = 9999
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//fps = 9999
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let frameTime = 1.0 / fps
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let frameCount = readInt() % 16777216
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let globalType = readShort()
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sys.free(readBytes(12)) // skip 12 bytes
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let frameCount = seqread.readInt() % 16777216
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let globalType = seqread.readShort()
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sys.free(seqread.readBytes(12)) // skip 12 bytes
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let akku = frameTime
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let framesRendered = 0
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//serial.println(readCount) // must say 18
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//serial.println(seqread.getReadCount()) // must say 18
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//serial.println(`Dim: (${width}x${height}), FPS: ${fps}, Frames: ${frameCount}`)
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/*if (type != 4 && type != 5 && type != 260 && type != 261) {
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@@ -165,7 +69,7 @@ audio.setPcmMode(0)
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audio.setMasterVolume(0, 255)
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renderLoop:
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while (readCount < FILE_LENGTH) {
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while (seqread.getReadCount() < FILE_LENGTH) {
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let t1 = sys.nanoTime()
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if (akku >= frameTime) {
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@@ -178,9 +82,9 @@ while (readCount < FILE_LENGTH) {
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if (frameUnit != 0) {
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// skip frames if necessary
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while (frameUnit >= 1 && readCount < FILE_LENGTH) {
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while (frameUnit >= 1 && seqread.getReadCount() < FILE_LENGTH) {
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let packetType = readShort()
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let packetType = seqread.readShort()
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// ideally, first two packets will be audio packets
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@@ -190,7 +94,7 @@ while (readCount < FILE_LENGTH) {
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}
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// background colour packets
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else if (65279 == packetType) {
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let rgbx = readInt()
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let rgbx = seqread.readInt()
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graphics.setBackground(
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(rgbx & 0xFF000000) >>> 24,
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(rgbx & 0x00FF0000) >>> 16,
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@@ -202,14 +106,14 @@ while (readCount < FILE_LENGTH) {
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// iPF
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if (packetType == 4 || packetType == 5 || packetType == 260 || packetType == 261) {
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let decodefun = (packetType > 255) ? graphics.decodeIpf2 : graphics.decodeIpf1
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let payloadLen = readInt()
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let payloadLen = seqread.readInt()
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if (framesRead >= frameCount) {
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break renderLoop
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}
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framesRead += 1
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let gzippedPtr = readBytes(payloadLen)
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let gzippedPtr = seqread.readBytes(payloadLen)
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framesRendered += 1
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if (frameUnit == 1) {
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@@ -226,14 +130,16 @@ while (readCount < FILE_LENGTH) {
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sys.free(gzippedPtr)
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}
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else {
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throw Error(`Unknown Video Packet with type ${packetType} at offset ${readCount - 2}`)
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throw Error(`Unknown Video Packet with type ${packetType} at offset ${seqread.getReadCount() - 2}`)
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}
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}
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// audio packets
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else if (4096 <= packetType && packetType <= 6133) {
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if (4097 == packetType) {
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let readLength = readInt()
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let samples = readBytes(readLength)
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let readLength = seqread.readInt()
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let samples = seqread.readBytes(readLength)
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if (readLength == 0) throw Error("Readlength is zero")
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audio.putPcmDataByPtr(samples, readLength, 0)
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audio.setSampleUploadLength(0, readLength)
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@@ -242,11 +148,11 @@ while (readCount < FILE_LENGTH) {
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sys.free(samples)
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}
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else {
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throw Error(`Audio Packet with type ${packetType} at offset ${readCount - 2}`)
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throw Error(`Audio Packet with type ${packetType} at offset ${seqread.getReadCount() - 2}`)
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}
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}
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else {
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println(`Unknown Packet with type ${packetType} at offset ${readCount - 2}`)
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println(`Unknown Packet with type ${packetType} at offset ${seqread.getReadCount() - 2}`)
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}
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}
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}
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