void decodeSinusoidal(BitStream in, SBRHeader header, FrequencyTables tables)
throws AACException {
if (sinusoidalsPresent = in.readBool()) {
for (int i = 0; i < tables.getN(HIGH); i++) {
sinusoidals[i] = in.readBool();
}
} else Arrays.fill(sinusoidals, false);
}
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 decodeEnvelope(
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, bits;
if (coupling && secCh) {
delta = 1;
if (ampRes) {
bits = 5;
tHuff = T_HUFFMAN_ENV_BAL_3_0;
tLav = T_HUFFMAN_ENV_BAL_3_0_LAV;
fHuff = F_HUFFMAN_ENV_BAL_3_0;
fLav = F_HUFFMAN_ENV_BAL_3_0_LAV;
} else {
bits = 6;
tHuff = T_HUFFMAN_ENV_BAL_1_5;
tLav = T_HUFFMAN_ENV_BAL_1_5_LAV;
fHuff = F_HUFFMAN_ENV_BAL_1_5;
fLav = F_HUFFMAN_ENV_BAL_1_5_LAV;
}
} else {
delta = 0;
if (ampRes) {
bits = 6;
tHuff = T_HUFFMAN_ENV_3_0;
tLav = T_HUFFMAN_ENV_3_0_LAV;
fHuff = F_HUFFMAN_ENV_3_0;
fLav = F_HUFFMAN_ENV_3_0_LAV;
} else {
bits = 7;
tHuff = T_HUFFMAN_ENV_1_5;
tLav = T_HUFFMAN_ENV_1_5_LAV;
fHuff = F_HUFFMAN_ENV_1_5;
fLav = F_HUFFMAN_ENV_1_5_LAV;
}
}
// read delta coded huffman data
final int[] envBands = tables.getN();
final int odd = envBands[1] & 1;
int j, k, frPrev;
float[] prev;
for (int i = 0; i < envCount; i++) {
prev = (i == 0) ? envelopeSFPrevious : envelopeSF[i - 1];
frPrev = (i == 0) ? freqResPrevious : freqRes[i - 1];
if (dfEnv[i]) {
if (freqRes[i] == frPrev) {
for (j = 0; j < envBands[freqRes[i]]; j++) {
envelopeSF[i][j] = prev[j] + ((decodeHuffman(in, tHuff) - tLav) << delta);
}
} else if (freqRes[i] == 1) {
for (j = 0; j < envBands[freqRes[i]]; j++) {
k = (j + odd) >> 1; // fLow[k] <= fHigh[j] < fLow[k + 1]
envelopeSF[i][j] = prev[k] + ((decodeHuffman(in, tHuff) - tLav) << delta);
}
} else {
for (j = 0; j < envBands[freqRes[i]]; j++) {
k = (j != 0) ? (2 * j - odd) : 0; // fHigh[k] == fLow[j]
envelopeSF[i][j] = prev[k] + ((decodeHuffman(in, tHuff) - tLav) << delta);
}
}
} else {
envelopeSF[i][0] = in.readBits(bits) << delta;
for (j = 1; j < envBands[freqRes[i]]; j++) {
envelopeSF[i][j] = envelopeSF[i][j - 1] + ((decodeHuffman(in, fHuff) - fLav) << delta);
}
}
}
// save for next frame
System.arraycopy(envelopeSF[envCount - 1], 0, envelopeSFPrevious, 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);
}
}
