在我寻求帮助之前,让我告诉你我做了什么:假设我的采样率为 8000Hz,样本大小为 16 位(2 字节),在第二秒结束时,我需要 16000 字节或 8000 字节。
现在我有一个10fps的记录速度,然后对于每个 fps 我需要 16000/10 = 1600 字节。
所以,故事是这样发展的:
声明的变量:
byte[] eachPass = new byte[1600]; //used to store data from TargetDataLine for each pass
byte[] backingArray = new byte[16000]; //the complete data for one second
ByteBuffer buffer = ByteBuffer.wrap(backingArray); //buffer which stores the complete data
short[] audioSample = new short[16000/2]; //audio samples to be encoded
int passCounter = 0; /* After 10th pass, convert the byte[] to short[]
* using ByteBuffer */
int seconds = 0; // used to store the position of the packet
byte[] 到 short[] 的循环和后续转换
while(keepCapturing == true){
-- set up the java.awt.Robot and TargetDataLine before entering the loop --
-- use java.awt.Robot to record the screen --
-- do some other stuff, if needed --
fromMic.read(eachPass,0,eachPass.length); // read data from microphone
buffer.put(eachPass); //put it in a bigger buffer
if(passCounter!=0 && passCounter%10==0){ // is it 10th frame?
passCounter = 0; //reset counter
seconds++;
buffer.asShortBuffer.get(audioSamples); //get short[] in BigEndian format
-- encode the audio at position (seconds-1) --
buffer.clear();
}else{
passCounter++;
}
问题
buffer.position()
中返回 16000 ,我也会得到一个if
BufferUnderflowException
buffer.asShortBuffer.get(audioSamples);
java.util.Arrays.toString()
看到我的eachPass
和audioSamples
包含的内容,我在 eachPass 中得到了一些数字,例如 -107、0、32 等,在 audioSamples 中得到了全零。为什么?