private void ProcessBuffer(boolean bFinalize) throws IOException {
if (m_pBuffer == null) throw new JMACException("Error Undefined");
// process as much as possible
int nThreshold = (bFinalize) ? 0 : m_spAPECompressCreate.GetFullFrameBytes();
while ((m_nBufferTail - m_nBufferHead) >= nThreshold) {
int nFrameBytes =
Math.min(m_spAPECompressCreate.GetFullFrameBytes(), m_nBufferTail - m_nBufferHead);
if (nFrameBytes == 0) break;
pByteReader.reset(m_pBuffer, m_nBufferHead);
m_spAPECompressCreate.EncodeFrame(pByteReader, nFrameBytes);
m_nBufferHead += nFrameBytes;
}
// shift the buffer
if (m_nBufferHead != 0) {
int nBytesLeft = m_nBufferTail - m_nBufferHead;
if (nBytesLeft != 0) System.arraycopy(m_pBuffer, m_nBufferHead, m_pBuffer, 0, nBytesLeft);
m_nBufferTail -= m_nBufferHead;
m_nBufferHead = 0;
}
}
public void prepare(
ByteArrayReader pRawData,
int nBytes,
final WaveFormat pWaveFormatEx,
int[] pOutputX,
int[] pOutputY,
Crc32 pCRC,
IntegerPointer pSpecialCodes,
IntegerPointer pPeakLevel) {
// initialize the pointers that got passed in
pCRC.init();
pSpecialCodes.value = 0;
// variables
int nTotalBlocks = nBytes / pWaveFormatEx.nBlockAlign;
int R, L;
// the prepare code
if (pWaveFormatEx.wBitsPerSample == 8) {
if (pWaveFormatEx.nChannels == 2) {
for (int nBlockIndex = 0; nBlockIndex < nTotalBlocks; nBlockIndex++) {
short b1 = pRawData.readUnsignedByte();
short b2 = pRawData.readUnsignedByte();
R = b1 - 128;
L = b2 - 128;
pCRC.append((byte) b1);
pCRC.append((byte) b2);
// check the peak
if (Math.abs(L) > pPeakLevel.value) pPeakLevel.value = Math.abs(L);
if (Math.abs(R) > pPeakLevel.value) pPeakLevel.value = Math.abs(R);
// convert to x,y
pOutputY[nBlockIndex] = L - R;
pOutputX[nBlockIndex] = R + (pOutputY[nBlockIndex] / 2);
}
} else if (pWaveFormatEx.nChannels == 1) {
for (int nBlockIndex = 0; nBlockIndex < nTotalBlocks; nBlockIndex++) {
short b1 = pRawData.readUnsignedByte();
R = b1 - 128;
pCRC.append((byte) b1);
// check the peak
if (Math.abs(R) > pPeakLevel.value) pPeakLevel.value = Math.abs(R);
// convert to x,y
pOutputX[nBlockIndex] = R;
}
}
} else if (pWaveFormatEx.wBitsPerSample == 24) {
if (pWaveFormatEx.nChannels == 2) {
for (int nBlockIndex = 0; nBlockIndex < nTotalBlocks; nBlockIndex++) {
long nTemp = 0;
short b = pRawData.readUnsignedByte();
nTemp |= (b << 0);
pCRC.append((byte) b);
b = pRawData.readUnsignedByte();
nTemp |= (b << 8);
pCRC.append((byte) b);
b = pRawData.readUnsignedByte();
nTemp |= (b << 16);
pCRC.append((byte) b);
if ((nTemp & 0x800000) != 0) R = (int) (nTemp & 0x7fffff) - 0x800000;
else R = (int) (nTemp & 0x7fffff);
nTemp = 0;
b = pRawData.readUnsignedByte();
nTemp |= (b << 0);
pCRC.append((byte) b);
b = pRawData.readUnsignedByte();
nTemp |= (b << 8);
pCRC.append((byte) b);
b = pRawData.readUnsignedByte();
nTemp |= (b << 16);
pCRC.append((byte) b);
if ((nTemp & 0x800000) != 0) L = (int) (nTemp & 0x7fffff) - 0x800000;
else L = (int) (nTemp & 0x7fffff);
// check the peak
if (Math.abs(L) > pPeakLevel.value) pPeakLevel.value = Math.abs(L);
if (Math.abs(R) > pPeakLevel.value) pPeakLevel.value = Math.abs(R);
// convert to x,y
pOutputY[nBlockIndex] = L - R;
pOutputX[nBlockIndex] = R + (pOutputY[nBlockIndex] / 2);
}
} else if (pWaveFormatEx.nChannels == 1) {
for (int nBlockIndex = 0; nBlockIndex < nTotalBlocks; nBlockIndex++) {
long nTemp = 0;
short b = pRawData.readUnsignedByte();
nTemp |= (b << 0);
pCRC.append((byte) b);
b = pRawData.readUnsignedByte();
nTemp |= (b << 8);
pCRC.append((byte) b);
b = pRawData.readUnsignedByte();
nTemp |= (b << 16);
pCRC.append((byte) b);
if ((nTemp & 0x800000) != 0) R = (int) (nTemp & 0x7fffff) - 0x800000;
else R = (int) (nTemp & 0x7fffff);
// check the peak
if (Math.abs(R) > pPeakLevel.value) pPeakLevel.value = Math.abs(R);
// convert to x,y
pOutputX[nBlockIndex] = R;
}
}
} else {
if (pWaveFormatEx.nChannels == 2) {
int LPeak = 0;
int RPeak = 0;
int nBlockIndex = 0;
for (nBlockIndex = 0; nBlockIndex < nTotalBlocks; nBlockIndex++) {
R = pRawData.readShort();
pCRC.append((short) R);
L = pRawData.readShort();
pCRC.append((short) L);
// check the peak
if (Math.abs(L) > LPeak) LPeak = Math.abs(L);
if (Math.abs(R) > RPeak) RPeak = Math.abs(R);
// convert to x,y
pOutputY[nBlockIndex] = L - R;
pOutputX[nBlockIndex] = R + (pOutputY[nBlockIndex] / 2);
}
if (LPeak == 0) pSpecialCodes.value |= SpecialFrame.SPECIAL_FRAME_LEFT_SILENCE;
if (RPeak == 0) pSpecialCodes.value |= SpecialFrame.SPECIAL_FRAME_RIGHT_SILENCE;
if (Math.max(LPeak, RPeak) > pPeakLevel.value) pPeakLevel.value = Math.max(LPeak, RPeak);
// check for pseudo-stereo files
nBlockIndex = 0;
while (pOutputY[nBlockIndex++] == 0) {
if (nBlockIndex == (nBytes / 4)) {
pSpecialCodes.value |= SpecialFrame.SPECIAL_FRAME_PSEUDO_STEREO;
break;
}
}
} else if (pWaveFormatEx.nChannels == 1) {
int nPeak = 0;
for (int nBlockIndex = 0; nBlockIndex < nTotalBlocks; nBlockIndex++) {
R = pRawData.readUnsignedShort();
pCRC.append((short) R);
// check the peak
if (Math.abs(R) > nPeak) nPeak = Math.abs(R);
// convert to x,y
pOutputX[nBlockIndex] = R;
}
if (nPeak > pPeakLevel.value) pPeakLevel.value = nPeak;
if (nPeak == 0) pSpecialCodes.value |= SpecialFrame.SPECIAL_FRAME_MONO_SILENCE;
}
}
pCRC.prefinalizeCrc();
// add the special code
pCRC.finalizeCrc();
if (pSpecialCodes.value != 0) pCRC.doSpecial();
}