问题描述
在接收数据和应用播放声音之间，我开始遇到一些延迟问题。以前我只使用 SoundPool 加载了 5 个声音并且延迟接近 0，但是现在在创建额外的 42 个变量来加载不同的声音以及增加我的输入缓冲区后，我遇到了这些延迟问题。我不确定这是因为评估缓冲区元素需要多长时间，还是因为我包含了所有额外的变量来存储 SoundPool 声音。在使用所有这些变量方面，有什么方法可以使我的代码更高效？
编辑（2/17/21）：发现在将缓冲区元素输出到 logcat 时，有时接收到的数据有时会被一个元素关闭，有时则不会。我从输入缓冲区读取信息的方式一定有问题，但我终生无法弄清楚
编辑 (2/19/21)：如果数组 > 大小为 6，这似乎只是一个问题 还发现当输入流接收到一个输入时，它会额外读取 2-4 次，而且都是不同的值
private class ConnectedThread(private val mmSocket: BluetoothSocket?,c: Context) : Thread() {
private val mmBuffer: ByteArray = ByteArray(12) // mmBuffer store for the stream
private var a1 = 0
private var b1 = 0
private var c1 = 0
private var d1 = 0
private var e1 = 0
private var f1 = 0
private var g1 = 0
private var a2 = 0
private var b2 = 0
private var c2 = 0
private var d2 = 0
private var e2 = 0
private var f2 = 0
private var g2 = 0
private var a3 = 0
private var b3 = 0
private var c3 = 0
private var d3 = 0
private var e3 = 0
private var f3 = 0
private var g3 = 0
private var a4 = 0
private var b4 = 0
private var c4 = 0
private var d4 = 0
private var e4 = 0
private var f4 = 0
private var g4 = 0
private var a5 = 0
private var b5 = 0
private var c5 = 0
private var d5 = 0
private var e5 = 0
private var f5 = 0
private var g5 = 0
private var a6 = 0
private var b6 = 0
private var c6 = 0
private var d6 = 0
private var e6 = 0
private var f6 = 0
private var g6 = 0
private var soundPool: SoundPool? = null
private var soundStream1: Int? = 0
private var soundStream2: Int? = 0
private var soundStream3: Int? = 0
private var soundStream4: Int? = 0
private var soundStream5: Int? = 0
private var temp: ByteArray = ByteArray(12)
var read: Int = 0
var context: Context
init {
this.context = c
}
override fun run() {
var numBytes: Int = 0// bytes returned from read()
soundPool = SoundPool(10,AudioManager.STREAM_MUSIC,0)
a1 = soundPool!!.load(context,R.raw.c4,1)
b1 = soundPool!!.load(context,R.raw.d4,1)
c1 = soundPool!!.load(context,R.raw.e4,1)
d1 = soundPool!!.load(context,R.raw.f4,1)
e1 = soundPool!!.load(context,R.raw.g4,1)
f1 = soundPool!!.load(context,1)
g1 = soundPool!!.load(context,1)
a2 = soundPool!!.load(context,1)
b2 = soundPool!!.load(context,1)
c2 = soundPool!!.load(context,1)
d2 = soundPool!!.load(context,1)
e2 = soundPool!!.load(context,1)
f2 = soundPool!!.load(context,1)
g2 = soundPool!!.load(context,1)
a3 = soundPool!!.load(context,R.raw.a3,1)
b3 = soundPool!!.load(context,R.raw.b3,1)
c3 = soundPool!!.load(context,R.raw.c3,1)
d3 = soundPool!!.load(context,R.raw.d3,1)
e3 = soundPool!!.load(context,R.raw.e3,1)
f3 = soundPool!!.load(context,R.raw.f3,1)
g3 = soundPool!!.load(context,R.raw.g3,1)
a4 = soundPool!!.load(context,R.raw.a4,1)
b4 = soundPool!!.load(context,R.raw.b4,1)
c4 = soundPool!!.load(context,1)
d4 = soundPool!!.load(context,1)
e4 = soundPool!!.load(context,1)
f4 = soundPool!!.load(context,1)
g4 = soundPool!!.load(context,1)
a5 = soundPool!!.load(context,R.raw.a5,1)
b5 = soundPool!!.load(context,1)
c5 = soundPool!!.load(context,R.raw.c5,1)
d5 = soundPool!!.load(context,R.raw.d5,1)
e5 = soundPool!!.load(context,R.raw.e5,1)
f5 = soundPool!!.load(context,R.raw.f5,1)
g5 = soundPool!!.load(context,R.raw.g5,1)
a6 = soundPool!!.load(context,1)
b6 = soundPool!!.load(context,1)
c6 = soundPool!!.load(context,R.raw.c6,1)
d6 = soundPool!!.load(context,1)
e6 = soundPool!!.load(context,1)
f6 = soundPool!!.load(context,1)
g6 = soundPool!!.load(context,1)
// Keep listening to the InputStream until an exception occurs.
while (true) {
// Read from the InputStream.
try {
numBytes =
mmSocket!!.inputStream.read(mmBuffer,numBytes,mmBuffer.size - numBytes)
} catch (e: IOException) {
Log.d(TAG,"Input stream was disconnected",e)
break
}
playNote(mmBuffer)
}
}
fun playNote(buf: ByteArray) {
var count: Int = 0
if (read == 0) {
read++
} else {
for (i in buf) {
Log.i("data",count.toString() + " " + i.toString())
if (i != '0'.toByte()) {
when (count) {
2 -> {
if(buf[count] != temp[count] && buf[count+1] != temp[count+1]){
soundPool?.stop(soundStream1!!)
}
soundStream1 = noteCheck(buf[count],buf[count + 1])
}
4 -> {
if(buf[count] != temp[count] && buf[count+1] != temp[count+1]){
soundPool?.stop(soundStream2!!)
}
soundStream2 = noteCheck(buf[count],buf[count+1])
}
6 -> {
if(buf[count] != temp[count] && buf[count+1] != temp[count+1]){
soundPool?.stop(soundStream3!!)
}
soundStream3 = noteCheck(buf[count],buf[count+1])
}
8 -> {
if(buf[count] != temp[count] && buf[count+1] != temp[count+1]){
soundPool?.stop(soundStream4!!)
}
soundStream4 = noteCheck(buf[count],buf[count+1])
}
10 -> {
if(buf[count] != temp[count] && buf[count+1] != temp[count+1]){
soundPool?.stop(soundStream5!!)
}
soundStream5 = noteCheck(buf[count],buf[count+1])
}
}
temp[count] = i
} else if (i == '0'.toByte()) {
temp[count] = i
}
count++
}
read = 0
}
}
fun noteCheck(check1 : Byte,check2 : Byte): Int? {
var sndStream: Int? = 0
if (check1 == 'a'.toByte()) {
when (check2) {
'1'.toByte() -> sndStream= soundPool?.play(a1,1F,1F)
'2'.toByte() -> sndStream= soundPool?.play(a2,1F)
'3'.toByte() -> sndStream= soundPool?.play(a3,1F)
'4'.toByte() -> sndStream= soundPool?.play(a4,1F)
'5'.toByte() -> sndStream= soundPool?.play(a5,1F)
'6'.toByte() -> sndStream= soundPool?.play(a6,1F)
}
} else if (check1 == 'b'.toByte()) {
when (check2) {
'1'.toByte() -> sndStream= soundPool?.play(b1,1F)
'2'.toByte() -> sndStream= soundPool?.play(b2,1F)
'3'.toByte() -> sndStream= soundPool?.play(b3,1F)
'4'.toByte() -> sndStream= soundPool?.play(b4,1F)
'5'.toByte() -> sndStream= soundPool?.play(b5,1F)
'6'.toByte() -> sndStream= soundPool?.play(b6,1F)
}
} else if (check1 == 'c'.toByte()) {
when (check2) {
'1'.toByte() -> sndStream= soundPool?.play(c1,1F)
'2'.toByte() -> sndStream= soundPool?.play(c2,1F)
'3'.toByte() -> sndStream= soundPool?.play(c3,1F)
'4'.toByte() -> sndStream= soundPool?.play(c4,1F)
'5'.toByte() -> sndStream= soundPool?.play(c5,1F)
'6'.toByte() -> sndStream= soundPool?.play(c6,1F)
}
} else if (check1 == 'd'.toByte()) {
when (check2) {
'1'.toByte() -> sndStream= soundPool?.play(d1,1F)
'2'.toByte() -> sndStream= soundPool?.play(d2,1F)
'3'.toByte() -> sndStream= soundPool?.play(d3,1F)
'4'.toByte() -> sndStream= soundPool?.play(d4,1F)
'5'.toByte() -> sndStream= soundPool?.play(d5,1F)
'6'.toByte() -> sndStream= soundPool?.play(d6,1F)
}
} else if (check1 == 'e'.toByte()) {
when (check2) {
'1'.toByte() -> sndStream= soundPool?.play(e1,1F)
'2'.toByte() -> sndStream= soundPool?.play(e2,1F)
'3'.toByte() -> sndStream= soundPool?.play(e3,1F)
'4'.toByte() -> sndStream= soundPool?.play(e4,1F)
'5'.toByte() -> sndStream= soundPool?.play(e5,1F)
'6'.toByte() -> sndStream= soundPool?.play(e6,1F)
}
} else if (check1 == 'f'.toByte()) {
when (check2) {
'1'.toByte() -> sndStream= soundPool?.play(f1,1F)
'2'.toByte() -> sndStream= soundPool?.play(f2,1F)
'3'.toByte() -> sndStream= soundPool?.play(f3,1F)
'4'.toByte() -> sndStream= soundPool?.play(f4,1F)
'5'.toByte() -> sndStream= soundPool?.play(f5,1F)
'6'.toByte() -> sndStream= soundPool?.play(f6,1F)
}
} else if (check1 == 'g'.toByte()) {
when (check2) {
'1'.toByte() -> sndStream=
soundPool?.play(g1,1F)
'2'.toByte() -> sndStream=
soundPool?.play(g2,1F)
'3'.toByte() -> sndStream=
soundPool?.play(g3,1F)
'4'.toByte() -> sndStream=
soundPool?.play(g4,1F)
'5'.toByte() -> sndStream=
soundPool?.play(g5,1F)
'6'.toByte() -> sndStream=
soundPool?.play(g6,1F)
}
}
return sndStream
}
}
Logcat 输出：我每次都发送完全相同的数据，但有时会有所不同
2021-02-19 04:08:24.408 16533-21821/com.example.airboard I/data: ---------------------------------------------
2021-02-19 04:08:24.408 16533-21821/com.example.airboard I/data: 0 48
2021-02-19 04:08:24.408 16533-21821/com.example.airboard I/data: 1 97
2021-02-19 04:08:24.408 16533-21821/com.example.airboard I/data: 2 51
2021-02-19 04:08:24.408 16533-21821/com.example.airboard I/data: 3 98
2021-02-19 04:08:24.408 16533-21821/com.example.airboard I/data: 4 51
2021-02-19 04:08:24.408 16533-21821/com.example.airboard I/data: 5 48
2021-02-19 04:08:24.408 16533-21821/com.example.airboard I/data: 6 48
2021-02-19 04:08:24.408 16533-21821/com.example.airboard I/data: 7 100
2021-02-19 04:08:24.408 16533-21821/com.example.airboard I/data: 8 51
2021-02-19 04:08:24.408 16533-21821/com.example.airboard I/data: 9 101
2021-02-19 04:08:24.408 16533-21821/com.example.airboard I/data: 10 51
2021-02-19 04:08:24.408 16533-21821/com.example.airboard I/data: 11 48
2021-02-19 04:08:24.594 16533-21821/com.example.airboard I/data: ---------------------------------------------
2021-02-19 04:08:24.594 16533-21821/com.example.airboard I/data: 0 48
2021-02-19 04:08:24.594 16533-21821/com.example.airboard I/data: 1 48
2021-02-19 04:08:24.594 16533-21821/com.example.airboard I/data: 2 51
2021-02-19 04:08:24.595 16533-21821/com.example.airboard I/data: 3 98
2021-02-19 04:08:24.595 16533-21821/com.example.airboard I/data: 4 51
2021-02-19 04:08:24.595 16533-21821/com.example.airboard I/data: 5 48
2021-02-19 04:08:24.595 16533-21821/com.example.airboard I/data: 6 48
2021-02-19 04:08:24.595 16533-21821/com.example.airboard I/data: 7 100
2021-02-19 04:08:24.595 16533-21821/com.example.airboard I/data: 8 51
2021-02-19 04:08:24.595 16533-21821/com.example.airboard I/data: 9 101
2021-02-19 04:08:24.595 16533-21821/com.example.airboard I/data: 10 48
2021-02-19 04:08:24.595 16533-21821/com.example.airboard I/data: 11 48
2021-02-19 04:08:24.627 16533-21821/com.example.airboard I/data: ---------------------------------------------
2021-02-19 04:08:24.627 16533-21821/com.example.airboard I/data: 0 48
2021-02-19 04:08:24.627 16533-21821/com.example.airboard I/data: 1 97
2021-02-19 04:08:24.627 16533-21821/com.example.airboard I/data: 2 51
2021-02-19 04:08:24.627 16533-21821/com.example.airboard I/data: 3 98
2021-02-19 04:08:24.627 16533-21821/com.example.airboard I/data: 4 51
2021-02-19 04:08:24.627 16533-21821/com.example.airboard I/data: 5 48
2021-02-19 04:08:24.627 16533-21821/com.example.airboard I/data: 6 48
2021-02-19 04:08:24.627 16533-21821/com.example.airboard I/data: 7 100
2021-02-19 04:08:24.627 16533-21821/com.example.airboard I/data: 8 51
2021-02-19 04:08:24.627 16533-21821/com.example.airboard I/data: 9 51
2021-02-19 04:08:24.627 16533-21821/com.example.airboard I/data: 10 48
2021-02-19 04:08:24.627 16533-21821/com.example.airboard I/data: 11 48
2021-02-19 04:08:24.814 16533-21821/com.example.airboard I/data: ---------------------------------------------
2021-02-19 04:08:24.814 16533-21821/com.example.airboard I/data: 0 48
2021-02-19 04:08:24.814 16533-21821/com.example.airboard I/data: 1 97
2021-02-19 04:08:24.814 16533-21821/com.example.airboard I/data: 2 51
2021-02-19 04:08:24.814 16533-21821/com.example.airboard I/data: 3 98
2021-02-19 04:08:24.814 16533-21821/com.example.airboard I/data: 4 51
2021-02-19 04:08:24.814 16533-21821/com.example.airboard I/data: 5 48
2021-02-19 04:08:24.814 16533-21821/com.example.airboard I/data: 6 48
2021-02-19 04:08:24.814 16533-21821/com.example.airboard I/data: 7 100
2021-02-19 04:08:24.814 16533-21821/com.example.airboard I/data: 8 51
2021-02-19 04:08:24.815 16533-21821/com.example.airboard I/data: 9 101
2021-02-19 04:08:24.815 16533-21821/com.example.airboard I/data: 10 51
2021-02-19 04:08:24.815 16533-21821/com.example.airboard I/data: 11 48
解决方法
显然，我的解决方案是将数据读入 ByteArray，然后对其进行评估，但无法正常工作。将我的阅读行更改为：
val ch = mmSocket!!.inputStream.read().toChar()
mmBuffer[c23] = ch
c23++
并将我的缓冲区从 ByteArray 更改为 CharArray 并获得了更好的结果。