void decodeNoise(
BitStream in, SBRHeader header, FrequencyTables tables, boolean secCh, boolean coupling)
throws AACException {
// select huffman codebooks
final int[][] tHuff, fHuff;
final int tLav, fLav;
final int delta;
if (coupling && secCh) {
delta = 1;
tHuff = T_HUFFMAN_NOISE_BAL_3_0;
tLav = T_HUFFMAN_NOISE_BAL_3_0_LAV;
fHuff = F_HUFFMAN_NOISE_BAL_3_0;
fLav = F_HUFFMAN_NOISE_BAL_3_0_LAV;
} else {
delta = 0;
tHuff = T_HUFFMAN_NOISE_3_0;
tLav = T_HUFFMAN_NOISE_3_0_LAV;
fHuff = F_HUFFMAN_NOISE_3_0;
fLav = F_HUFFMAN_NOISE_3_0_LAV;
}
// read huffman data: i=noise, j=band
final int noiseBands = tables.getNq();
int j;
float[] prev;
for (int i = 0; i < noiseCount; i++) {
if (dfNoise[i]) {
prev = (i == 0) ? noiseFDPrevious : noiseFloorData[i - 1];
for (j = 0; j < noiseBands; j++) {
noiseFloorData[i][j] = prev[j] + ((decodeHuffman(in, tHuff) - tLav) << delta);
}
} else {
noiseFloorData[i][0] = in.readBits(5) << delta;
for (j = 1; j < noiseBands; j++) {
noiseFloorData[i][j] =
noiseFloorData[i][j - 1] + ((decodeHuffman(in, fHuff) - fLav) << delta);
}
}
}
// save for next frame
System.arraycopy(noiseFloorData[noiseCount - 1], 0, noiseFDPrevious, 0, MAX_BANDS);
}
void decodeInvf(BitStream in, SBRHeader header, FrequencyTables tables) throws AACException {
for (int i = 0; i < tables.getNq(); i++) {
invfMode[i] = in.readBits(2);
}
}
