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"hardware" based mp2 decoding; dma and memcpy can now move data into the "hardware"

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minjaesong
2023-01-21 15:09:03 +09:00
parent b1041dff5f
commit 8fdde0b192
19 changed files with 744 additions and 628 deletions
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6
assets/disk0/tvdos/include/seqread.js
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@@ -49,6 +49,8 @@ function readBytes(length, ptrToDecode) {
let ptr = (ptrToDecode === undefined) ? sys.malloc(length) : ptrToDecode
let requiredBlocks = Math.floor((readCount + length) / 4096) - Math.floor(readCount / 4096)
let destVector = (ptrToDecode >= 0) ? 1 : -1
let completedReads = 0
// serial.println(`readBytes(${length}); readCount = ${readCount}`)
@@ -74,7 +76,7 @@ function readBytes(length, ptrToDecode) {
// serial.println(`Pulled a block (${thisBlockLen}); readCount = ${readCount}, completedReads = ${completedReads}, remaining = ${remaining}`)
// copy from read buffer to designated position
sys.memcpy(-4097 - port*4096, ptr + completedReads, remaining)
sys.memcpy(-4097 - port*4096, ptr + completedReads*destVector, remaining)
// increment readCount properly
readCount += remaining
@@ -90,7 +92,7 @@ function readBytes(length, ptrToDecode) {
// serial.println(`Reusing a block (${thisBlockLen}); readCount = ${readCount}, completedReads = ${completedReads}`)
// copy from read buffer to designated position
sys.memcpy(-4097 - port*4096 - padding, ptr + completedReads, thisBlockLen)
sys.memcpy(-4097 - port*4096 - padding, ptr + completedReads*destVector, thisBlockLen)
// increment readCount properly
readCount += thisBlockLen