public static void main(String[] args) {
ByteBuffer bb = ByteBuffer.wrap(new byte[] {0, 0, 0, 0, 0, 0, 0, 'a'});
bb.rewind();
printnb("Byte Buffer ");
while (bb.hasRemaining()) printnb(bb.position() + " -> " + bb.get() + ", ");
print();
CharBuffer cb = ((ByteBuffer) bb.rewind()).asCharBuffer();
printnb("Char Buffer ");
while (cb.hasRemaining()) printnb(cb.position() + " -> " + cb.get() + ", ");
print();
FloatBuffer fb = ((ByteBuffer) bb.rewind()).asFloatBuffer();
printnb("Float Buffer ");
while (fb.hasRemaining()) printnb(fb.position() + " -> " + fb.get() + ", ");
print();
IntBuffer ib = ((ByteBuffer) bb.rewind()).asIntBuffer();
printnb("Int Buffer ");
while (ib.hasRemaining()) printnb(ib.position() + " -> " + ib.get() + ", ");
print();
LongBuffer lb = ((ByteBuffer) bb.rewind()).asLongBuffer();
printnb("Long Buffer ");
while (lb.hasRemaining()) printnb(lb.position() + " -> " + lb.get() + ", ");
print();
ShortBuffer sb = ((ByteBuffer) bb.rewind()).asShortBuffer();
printnb("Short Buffer ");
while (sb.hasRemaining()) printnb(sb.position() + " -> " + sb.get() + ", ");
print();
DoubleBuffer db = ((ByteBuffer) bb.rewind()).asDoubleBuffer();
printnb("Double Buffer ");
while (db.hasRemaining()) printnb(db.position() + " -> " + db.get() + ", ");
}
public static void main(String args[]) throws Exception {
FloatBuffer buffer = FloatBuffer.allocate(10);
for (int i = 0; i < buffer.capacity(); ++i) {
float f = (float) Math.sin((((float) i) / 10) * (2 * Math.PI));
buffer.put(f);
}
/** flip()源码： */
// public final Buffer flip() {
// limit = position;
// position = 0;
// mark = -1;
// return this;
// }
/**
* 反转缓冲区。首先将限制设置为当前位置，然后将位置设置为 0。 如果已定义了标记，则丢弃该标记。 常与compact方法一起使用。 通常情况下，在准备从缓冲区中读取数据时调用flip方法。
*/
buffer.flip();
while (buffer.hasRemaining()) {
float f = buffer.get();
System.out.println(f);
}
}
private void switchBuffers(int offset, float[] audioArray, SyncBuffer oldBuffer) {
int toBePadded = offset;
FloatBuffer oldFloatBuffer = oldBuffer.asFloatBuffer();
// 1) use the remaining space in the current buffer
// ...pad the current buffer as much as fits.
while ((toBePadded > 0) && (oldFloatBuffer.hasRemaining())) {
oldFloatBuffer.put(0F);
toBePadded--;
samplesProcessed++;
}
// ...put as much as fits from the audioArray
int audioArrayWrittenToOld = 0;
if (oldFloatBuffer.hasRemaining() && toBePadded == 0) {
audioArrayWrittenToOld = oldFloatBuffer.remaining();
oldFloatBuffer.put(audioArray, 0, audioArrayWrittenToOld);
samplesProcessed += audioArrayWrittenToOld;
}
// 2) put the rest in a new buffer
if (!startBufferDone) {
// setup the first file buffer
bussyBufferProvider = new AlwaysStreamedBuffer(new SyncBuffer(requestedFileBufferSizeFloat));
} else {
if (!firstFileBufferDone) {
// setup the second file buffer
bussyBufferProvider =
new AlwaysStreamedBuffer(new SyncBuffer(requestedFileBufferSizeFloat));
}
}
if (bussyBufferProvider == null) {
logger.severe("Next buffer is null!!");
return;
}
if (!bussyBufferProvider.isDone()) {
logger.warning("Next buffer not ready.");
overflowCount++;
return;
}
SyncBuffer newBuffer;
FileChannel channel;
try {
FileWriteTaskResult result = bussyBufferProvider.get();
newBuffer = result.getbuffer();
channel = result.getChannel();
} catch (InterruptedException | ExecutionException ex) {
logger.log(Level.SEVERE, null, ex);
return;
}
FloatBuffer newFloatBuffer = newBuffer.asFloatBuffer();
//
int remainingInNewBuffer = newFloatBuffer.remaining();
int toBeWrittenToNew = toBePadded + audioArray.length - audioArrayWrittenToOld;
if (toBeWrittenToNew > remainingInNewBuffer) {
logger.severe("File buffer too small for this offset.");
} else {
for (int i = 0; i < toBePadded; i++) {
newFloatBuffer.put(0F);
samplesProcessed++;
}
int restAudioArray = audioArray.length - audioArrayWrittenToOld;
newFloatBuffer.put(audioArray, audioArrayWrittenToOld, restAudioArray);
samplesProcessed += restAudioArray;
}
if (startBufferDone) {
FileWriteTask fileWriteTask = new FileWriteTask(outputFile, channel, oldBuffer);
currentBufferProvider = bussyBufferProvider;
bussyBufferProvider = executor.submit(fileWriteTask);
firstFileBufferDone = true;
} else {
// we just have processed the first buffer:
currentBufferProvider = bussyBufferProvider;
bussyBufferProvider = null;
startBufferDone = true;
}
}