curioustorvald/tsvm
1
0
Fork 0
mirror of https://github.com/curioustorvald/tsvm.git synced 2026-06-14 08:24:04 +09:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source
This commit is contained in:
minjaesong
2023-01-20 03:17:39 +09:00
parent dedc910155
commit b1041dff5f
3 changed files with 55 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
assets/disk0/tvdos/bin/encodemov.js
View File

@@ -8,13 +8,14 @@ let HEIGHT = 448
let PATHFUN = (i) => `/namu2/${(''+i).padStart(5,'0')}.png` // how can be the image file found, if a frame number (starts from 1) were given
let AUDIOTRACK = 'namu.mp2'
let AUDIOFORMAT = 'MP2fr' // PCMu8 or MP2fr
let MP2_PACKETSIZE;
// to export video to its frames:
// ffmpeg -i file.mp4 file/%05d.bmp
// the input frames must be resized (and cropped) beforehand, using ImageMagick is recommended, like so:
// mogrify -path ./path/to/write/results/ -resize 560x448^ -gravity Center -extent 560x448 ./path/to/source/files/*
//
// end of manual configuration
let MP2_RATE_INDEX;
let MP2_PACKETSIZE;
let outfilename = exec_args[1]
if (!outfilename) {
@@ -43,7 +44,7 @@ function appendToOutfilePtr(ptr, len) {
function audioFormatToAudioPacketType() {
return ("PCMu8" == AUDIOFORMAT) ? [1, 16]
: ("MP2fr" == AUDIOFORMAT) ? [1, 17]
: ("MP2fr" == AUDIOFORMAT) ? [255, 17]
: [255, 16]
}
@@ -87,6 +88,25 @@ function getRepeatCount(fnum) {
}
}
function mp2PacketSizeToRateIndex(packetSize, isMono) {
let r = (144 == packetSize) ? 0
: (216 == packetSize) ? 2
: (252 == packetSize) ? 4
: (288 == packetSize) ? 6
: (360 == packetSize) ? 8
: (432 == packetSize) ? 10
: (504 == packetSize) ? 12
: (576 == packetSize) ? 14
: (720 == packetSize) ? 16
: (864 == packetSize) ? 18
: (1008 == packetSize) ? 20
: (1152 == packetSize) ? 22
: (1440 == packetSize) ? 24
: (1728 == packetSize) ? 26 : undefined
if (r === undefined) throw Error("Unknown MP2 Packet Size: "+packetSize)
return r + isMono
}
let audioSamplesWrote = 0
for (let f = 1; ; f++) {
@@ -115,6 +135,7 @@ for (let f = 1; ; f++) {
if (!MP2_PACKETSIZE) {
audioFile.pread(infile, 3, 0)
MP2_PACKETSIZE = audio.mp2GetInitialFrameSize([sys.peek(infile),sys.peek(infile+1),sys.peek(infile+2)])
audioPacketType[0] = mp2PacketSizeToRateIndex(MP2_PACKETSIZE, sys.peek(infile+4) >> 6 == 3)
}
actualBytesToRead = Math.min(MP2_PACKETSIZE, audioRemaining)
@@ -132,7 +153,7 @@ for (let f = 1; ; f++) {
]
appendToOutfile(audioPacketType)
appendToOutfile(audioSize)
if ("MP2fr" != AUDIOFORMAT) appendToOutfile(audioSize);
appendToOutfilePtr(infile, actualBytesToRead)