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mov: mp2 packet now has no length bytes as they are redundant

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minjaesong
2023-01-20 03:17:39 +09:00
parent dedc910155
commit b1041dff5f
3 changed files with 55 additions and 12 deletions
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8
assets/disk0/tvdos/bin/playmov.js
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@@ -6,7 +6,7 @@ const FBUF_SIZE = WIDTH * HEIGHT
const AUTO_BGCOLOUR_CHANGE = true
const MAGIC = [0x1F, 0x54, 0x53, 0x56, 0x4D, 0x4D, 0x4F, 0x56]
const pcm = require("pcm")
const MP2_FRAME_SIZE = [144,216,252,288,360,432,504,576,720,864,1008,1152,1440,1728]
const fullFilePath = _G.shell.resolvePathInput(exec_args[1])
const FILE_LENGTH = files.open(fullFilePath.full).size
@@ -227,11 +227,13 @@ while (!stopPlay && seqread.getReadCount() < FILE_LENGTH) {
}
// audio packets
else if (4096 <= packetType && packetType <= 6143) {
let readLength = seqread.readInt()
let readLength = (packetType >>> 8 == 17) ?
MP2_FRAME_SIZE[(packetType & 255) >>> 1] // if the packet is MP2, deduce it from the packet type
: seqread.readInt() // else, read 4 more bytes
if (readLength == 0) throw Error("Readlength is zero")
// MP2
if (packetType == 0x1100 || packetType == 0x1101) {
if (packetType >>> 8 == 17) {
if (audioQueue[audioQueuePos] === undefined) {
// throw Error(`Audio queue overflow: attempt to write to index ${audioQueuePos}; queue size: ${audioQueue.length}; frame: ${framesRead}`)
AUDIO_QUEUE_LENGTH += 1