mp3 decoding but slow

assets/disk0/home/mp3test.js

@@ -1,150 +0,0 @@
-const Mp3 = require('mp3dec')
-const pcm = require("pcm")
-
-
-class SequentialFileBuffer {
-
-    constructor(path, offset, length) {
-        if (Array.isArray(path)) throw Error("arg #1 is path(string), not array")
-
-        this.path = path
-        this.file = files.open(path)
-
-        this.offset = offset || 0
-        this.originalOffset = offset
-        this.length = length || this.file.size
-
-        this.seq = require("seqread")
-        this.seq.prepare(path)
-    }
-
-    /*readFull(n) {
-        throw Error()
-        let ptr = this.seq.readBytes(n)
-        return ptr
-    }*/
-
-    readStr(n) {
-        let ptr = this.seq.readBytes(n)
-        let s = ''
-        for (let i = 0; i < n; i++) {
-            if (i >= this.length) break
-            s += String.fromCharCode(sys.peek(ptr + i))
-        }
-        sys.free(ptr)
-        return s
-    }
-
-    readByteNumbers(n) {
-        let ptr = this.seq.readBytes(n)
-        let s = []
-        for (let i = 0; i < n; i++) {
-            if (i >= this.length) break
-            s.push(sys.peek(ptr + i))
-        }
-        sys.free(ptr)
-        return s
-    }
-
-    unread(diff) {
-        let newSkipLen = this.seq.getReadCount() - diff
-        this.seq.prepare(this.path)
-        this.seq.skip(newSkipLen)
-    }
-
-    rewind() {
-        this.seq.prepare(this.path)
-    }
-
-    seek(p) {
-        this.seq.prepare(this.path)
-        this.seq.skip(p)
-    }
-
-    get byteLength() {
-        return this.length
-    }
-
-    /*get remaining() {
-        return this.length - this.getReadCount()
-    }*/
-}
-
-
-
-Object.keys(Mp3).forEach(e=>{
-    print(`${e}\t`)
-})
-println()
-
-println("reading...")
-//let arr = files.open("A:/gateless.mp3").bread()
-//let ab = new ArrayBuffer(arr.length)
-//let abba = new Uint8Array(ab)
-//arr.forEach((v,i)=>{ abba[i] = v })
-//let mp3ArrayBuffer = new Uint8Array(ab, 0, arr.length)*
-
-println("decoding...")
-let decoder = Mp3.newDecoder(new SequentialFileBuffer("A:/gateless0.mp3"))
-if (decoder === null) throw Error("decoder is null")
-
-audio.resetParams(0)
-audio.purgeQueue(0)
-audio.setPcmMode(0)
-audio.setMasterVolume(0, 255)
-audio.play(0)
-
-let decodedLength = 0
-let readPtr = sys.malloc(8000)
-let decodePtr = sys.malloc(12000)
-
-
-function decodeAndResample(readArr, decodePtr, readLength) {
-    for (let i = 0; i < readLength; i+= 2) {
-        let sample = pcm.u16Tos16(readArr[i] | (readArr[i+1] << 8))
-        let u8 = pcm.s16Tou8(sample)
-
-        sys.poke(decodePtr + (i >> 1), u8)
-    }
-    return readLength / 2
-}
-
-
-function printPlayBar() {
-}
-
-
-const QUEUE_MAX = 4
-let t1 = sys.nanoTime()
-decoder.decode(obj=>{
-    let t2 = sys.nanoTime()
-
-
-    let buf = obj.buf
-    let err = obj.err
-
-    decodedLength += buf.byteLength
-
-    let declen = decodeAndResample(buf, decodePtr, buf.byteLength)
-
-    audio.putPcmDataByPtr(decodePtr, declen, 0)
-    audio.setSampleUploadLength(0, declen)
-    audio.startSampleUpload(0)
-    audio.play(0)
-
-
-//    sys.sleep(10) // decoding time is slower than realtime :(
-
-
-    let decodingTime = t2 - t1
-    let bufRealTimeLen = (declen) / 64000.0 * 1000000000
-    t1 = t2
-    println(`Decoded ${decodedLength} bytes; lag: ${(decodingTime - bufRealTimeLen) / 1000000} ms`)
-
-
-
-
-}) // now you got decoded PCM data
-
-sys.free(readPtr)
-sys.free(decodePtr)

assets/disk0/home/playrawpcm.js

@@ -145,5 +145,5 @@ while (sampleSize > 0) {
     sys.sleep(10)
 }
 
-audio.stop(0)
+//audio.stop(0)
 sys.free(decodePtr)