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();
}
public void unprepareOld(
int[] pInputX,
int[] pInputY,
int nBlocks,
WaveFormat pWaveFormatEx,
ByteBuffer output,
Crc32 crc,
int nFileVersion) {
// the CRC that will be figured during decompression
crc.init();
// decompress and convert from (x,y) -> (l,r)
// sort of int and ugly.... sorry
int channels = pWaveFormatEx.nChannels;
int bitsPerSample = pWaveFormatEx.wBitsPerSample;
if (channels == 2) {
// convert the x,y data to raw data
if (bitsPerSample == 16) {
short R;
int pX = 0;
int pY = 0;
for (; pX < nBlocks; pX++, pY++) {
R = (short) (pInputX[pX] - (pInputY[pY] / 2));
output.append(R);
crc.append(R);
R += pInputY[pY];
output.append(R);
crc.append(R);
}
} else if (bitsPerSample == 8) {
byte R;
if (nFileVersion > 3830) {
for (int SampleIndex = 0; SampleIndex < nBlocks; SampleIndex++) {
R = (byte) (pInputX[SampleIndex] - (pInputY[SampleIndex] / 2) + 128);
output.append(R);
crc.append(R);
R += pInputY[SampleIndex];
output.append(R);
crc.append(R);
}
} else {
for (int SampleIndex = 0; SampleIndex < nBlocks; SampleIndex++) {
R = (byte) (pInputX[SampleIndex] - (pInputY[SampleIndex] / 2));
output.append(R);
crc.append(R);
R += pInputY[SampleIndex];
output.append(R);
crc.append(R);
}
}
} else if (bitsPerSample == 24) {
int RV, LV;
for (int SampleIndex = 0; SampleIndex < nBlocks; SampleIndex++) {
RV = pInputX[SampleIndex] - (pInputY[SampleIndex] / 2);
LV = RV + pInputY[SampleIndex];
int nTemp = 0;
if (RV < 0) nTemp = (RV + 0x800000) | 0x800000;
else nTemp = RV;
output.append24(nTemp);
crc.append24(nTemp);
nTemp = 0;
if (LV < 0) nTemp = (LV + 0x800000) | 0x800000;
else nTemp = LV;
output.append24(nTemp);
crc.append24(nTemp);
}
}
} else if (channels == 1) {
// convert to raw data
if (bitsPerSample == 8) {
byte R;
if (nFileVersion > 3830) {
for (int SampleIndex = 0; SampleIndex < nBlocks; SampleIndex++) {
R = (byte) (pInputX[SampleIndex] + 128);
output.append(R);
crc.append(R);
}
} else {
for (int SampleIndex = 0; SampleIndex < nBlocks; SampleIndex++) {
R = (byte) (pInputX[SampleIndex]);
output.append(R);
crc.append(R);
}
}
} else if (bitsPerSample == 24) {
int RV;
for (int SampleIndex = 0; SampleIndex < nBlocks; SampleIndex++) {
RV = pInputX[SampleIndex];
int nTemp = 0;
if (RV < 0) nTemp = (RV + 0x800000) | 0x800000;
else nTemp = RV;
output.append24(nTemp);
crc.append24(nTemp);
}
} else {
short R;
for (int SampleIndex = 0; SampleIndex < nBlocks; SampleIndex++) {
R = (short) (pInputX[SampleIndex]);
output.append(R);
crc.append(R);
}
}
}
crc.prefinalizeCrc();
}