public void ResvFrameBegin(ref FrameParams fr_ps, ref SideInfo l3_side, int mean_bits, int frameLength)
{
Layer info;
int fullFrameBits, mode_gr;
int expectedResvSize, resvLimit;
info = fr_ps.Header;
mode_gr = 2;
resvLimit = 4088;
expectedResvSize = l3_side.MainDataBegin * 8;
fullFrameBits = mean_bits * mode_gr;
if (frameLength > 7680)
{
ResvMax = 0;
}
else
{
ResvMax = 7680 - frameLength;
}
if (ResvMax > resvLimit)
{
ResvMax = resvLimit;
}
}
public int ResvMaxBits(ref FrameParams fr_ps, ref SideInfo l3_side, ref double pe, int mean_bits)
{
int more_bits, max_bits, add_bits, over_bits;
mean_bits /= fr_ps.Chn;
max_bits = mean_bits;
if (max_bits > 4095)
{
max_bits = 4095;
}
if (ResvMax == 0)
{
return(max_bits);
}
more_bits = (int)(pe * 3.1 - mean_bits);
add_bits = 0;
if (more_bits > 100)
{
int frac = (ResvSize * 6) / 10;
if (frac < more_bits)
{
add_bits = frac;
}
else
{
add_bits = more_bits;
}
}
over_bits = ResvSize - ((ResvMax * 8) / 10) - add_bits;
if (over_bits > 0)
{
add_bits += over_bits;
}
max_bits += add_bits;
if (max_bits > 4095)
{
max_bits = 4095;
}
return(max_bits);
}
public void ResvFrameEnd(ref FrameParams fr_ps, ref SideInfo l3_side, int mean_bits)
{
int mode_gr, gr, ch, chn, ancillary_pad, stuffingBits;
int over_bits;
chn = fr_ps.Chn;
mode_gr = 2;
ancillary_pad = 0;
if ((chn == 2) && ((mean_bits & 1) != 0))
{
ResvSize += 1;
}
over_bits = ResvSize - ResvMax;
if (over_bits < 0)
{
over_bits = 0;
}
ResvSize -= over_bits;
stuffingBits = over_bits + ancillary_pad;
if ((over_bits = ResvSize % 8) != 0)
{
stuffingBits += over_bits;
ResvSize -= over_bits;
}
if (stuffingBits != 0)
{
if (l3_side.TT[0, 0].Part23Length + stuffingBits < 4095)
{
l3_side.TT[0, 0].Part23Length += stuffingBits;
}
else
{
for (gr = 0; gr < mode_gr; gr++)
{
for (ch = 0; ch < chn; ch++)
{
int extraBits, bitsThisGr;
if (stuffingBits == 0)
{
break;
}
extraBits = 4095 - l3_side.TT[ch, gr].Part23Length;
if (extraBits < stuffingBits)
{
bitsThisGr = extraBits;
}
else
{
bitsThisGr = stuffingBits;
}
l3_side.TT[0, 0].Part23Length += bitsThisGr;
stuffingBits -= bitsThisGr;
}
}
l3_side.ResvDrain = stuffingBits;
}
}
}
public void ResvAdjust(ref FrameParams fr_ps, ref GrInfo gi, ref SideInfo l3_side, int mean_bits)
{
ResvSize += (mean_bits / fr_ps.Chn) - gi.Part23Length;
}
void Preemphasis(double[] xr, double[,] xfsf, double[,,] xmin_l, double[,,,] xmin_s, int gr, int ch, ref SideInfo l3_side)
{
int i, start, end, scfsi_band, over;
uint sfb;
double ifqstep;
double mulval;
if (gr == 1)
{
for (scfsi_band = 0; scfsi_band < 4; scfsi_band++)
{
if (l3_side.Scfsi[ch, scfsi_band] != 0)
{
l3_side.TT[ch, gr].Preflag = l3_side.TT[ch, 0].Preflag;
return;
}
}
}
if (l3_side.TT[ch, gr].BlockType != 2 && l3_side.TT[ch, gr].Preflag == 0)
{
over = 0;
for (sfb = 17; sfb < 21; sfb++)
{
if (xfsf[0, sfb] > xmin_l[ch, gr, sfb])
{
over++;
}
}
if (over == 4)
{
l3_side.TT[ch, gr].Preflag = 1;
ifqstep = (l3_side.TT[ch, gr].ScalefacScale == 0) ? Math.Sqrt(2) : Math.Pow(2.0, (0.5 * (1.0 + l3_side.TT[ch, gr].ScalefacScale)));
for (sfb = 0; sfb < l3_side.TT[ch, gr].SfbLmax; sfb++)
{
xmin_l[ch, gr, sfb] *= Math.Pow(ifqstep, 2.0 * pretab[sfb]);
start = scalefac_band_long[sfb];
end = scalefac_band_long[sfb + 1];
mulval = Math.Pow(ifqstep, pretab[sfb]);
for (i = start; i < end; i++)
{
xr[i] *= mulval;
}
}
}
}
}
int AmpScalefacBands(double[] xr, double[,] xfsf, double[,,] xmin_l, double[,,,] xmin_s, ref SideInfo l3_side, int[][][] scalefact_l, int[][][][] scalefact_s, int gr, int ch, int iteration)
{
int start, end, l, i, scfsi_band, over = 0;
int sfb;
double ifqstep, ifqstep2;
int copySF, preventSF;
copySF = 0;
preventSF = 0;
if (l3_side.TT[ch, gr].ScalefacScale == 0)
{
ifqstep = 1.414213562;
}
else
{
ifqstep = Math.Pow(2.0, 0.5 * (1.0 + l3_side.TT[ch, gr].ScalefacScale));
}
if (gr == 1)
{
for (scfsi_band = 0; scfsi_band < 4; scfsi_band++)
{
if (l3_side.Scfsi[ch, scfsi_band] != 0)
{
if (l3_side.TT[ch, 0].ScalefacScale == 0)
{
ifqstep = 1.414213562;
}
else
{
ifqstep = Math.Pow(2.0, 0.5 * (1.0 + l3_side.TT[ch, 0].ScalefacScale));
}
if (iteration == 1)
{
copySF = 1;
}
else
{
preventSF = 1;
}
break;
}
}
}
ifqstep2 = ifqstep * ifqstep;
scfsi_band = 0;
for (sfb = 0; sfb < l3_side.TT[ch, gr].SfbLmax; sfb++)
{
if (copySF != 0 || preventSF != 0)
{
if (sfb == scfsi_band_long[scfsi_band + 1])
{
scfsi_band += 1;
}
if (l3_side.Scfsi[ch, scfsi_band] != 0)
{
if (copySF != 0)
{
scalefact_l[ch][gr][sfb] = scalefact_l[ch][0][sfb];
}
continue;
}
}
if (xfsf[0, sfb] > xmin_l[ch, gr, sfb])
{
over++;
xmin_l[ch, gr, sfb] *= ifqstep2;
scalefact_l[ch][gr][sfb]++;
start = scalefac_band_long[sfb];
end = scalefac_band_long[sfb + 1];
for (l = start; l < end; l++)
{
xr[l] *= ifqstep;
}
}
}
for (i = 0; i < 3; i++)
{
for (sfb = l3_side.TT[ch, gr].SfbSmax; sfb < 12; sfb++)
{
if (xfsf[i + 1, sfb] > xmin_s[ch, gr, sfb, i])
{
over++;
xmin_s[ch, gr, sfb, i] *= ifqstep2;
scalefact_s[ch][gr][sfb][i]++;
start = scalefac_band_short[sfb];
end = scalefac_band_short[sfb + 1];
for (l = start; l < end; l++)
{
xr[i + l * 3] *= ifqstep;
}
}
}
}
return(over);
}
private int OuterLoop(double[] abs_xr, int max_bits, double[,,] xmin_l, double[,,,] xmin_s, int[] abs_ix, ref FrameParams fr_ps, int[][][] scalefact_l, int[][][][] scalefact_s, int gr, int ch, ref SideInfo l3_side)
{
double[,] xfsf = new double[4, 21];
int[] scalesave_l = new int[21];
int[,] scalesave_s = new int[12, 3];
int bits, huff_bits, save_preflag, save_compress;
int sfb, b, over, iteration = 0;
do
{
iteration++;
l3_side.TT[ch, gr].Part2Length = Part2Length(scalefact_l, scalefact_s, ref fr_ps, gr, ch, ref l3_side);
huff_bits = max_bits - l3_side.TT[ch, gr].Part2Length;
if (iteration == 1)
{
BinSearchStepSize(max_bits, l3_side.TT[ch, gr].QuantizerStepSize, abs_ix, abs_xr, ref l3_side.TT[ch, gr]); /* speeds things up a bit */
}
bits = InnerLoop(abs_xr, abs_ix, huff_bits, ref l3_side.TT[ch, gr]);
CalcNoise(abs_xr, abs_ix, ref l3_side.TT[ch, gr], xfsf);
for (sfb = 0; sfb < 21; sfb++)
{
scalesave_l[sfb] = scalefact_l[ch][gr][sfb];
}
for (sfb = 0; sfb < 12; sfb++)
{
for (b = 0; b < 3; b++)
{
scalesave_s[sfb, b] = scalefact_s[ch][gr][sfb][b];
}
}
save_preflag = l3_side.TT[ch, gr].Preflag;
save_compress = l3_side.TT[ch, gr].ScalefacCompress;
Preemphasis(abs_xr, xfsf, xmin_l, xmin_s, gr, ch, ref l3_side);
over = AmpScalefacBands(abs_xr, xfsf, xmin_l, xmin_s, ref l3_side, scalefact_l, scalefact_s, gr, ch, iteration);
if (LoopBreak(scalefact_l, scalefact_s, ref l3_side.TT[ch, gr], gr, ch))
{
break;
}
if (ScaleBitcount(scalefact_l, scalefact_s, ref l3_side.TT[ch, gr], gr, ch) != 0)
{
break;
}
}while (over > 0);
l3_side.TT[ch, gr].Preflag = save_preflag;
l3_side.TT[ch, gr].ScalefacCompress = save_compress;
for (sfb = 0; sfb < 21; sfb++)
{
scalefact_l[ch][gr][sfb] = scalesave_l[sfb];
}
for (sfb = 0; sfb < 12; sfb++)
{
for (b = 0; b < 3; b++)
{
scalefact_s[ch][gr][sfb][b] = scalesave_s[sfb, b];
}
}
l3_side.TT[ch, gr].Part2Length = Part2Length(scalefact_l, scalefact_s, ref fr_ps, gr, ch, ref l3_side);
l3_side.TT[ch, gr].Part23Length = l3_side.TT[ch, gr].Part2Length + bits;
return(l3_side.TT[ch, gr].Part23Length);
}
static private int Part2Length(int[][][] scalefact_l, int[][][][] scalefact_s, ref FrameParams fr_ps, int gr, int ch, ref SideInfo si)
{
int slen1, slen2, bits;
bits = 0;
slen1 = Tables.Slen1Tab[si.TT[ch, gr].ScalefacCompress];
slen2 = Tables.Slen2Tab[si.TT[ch, gr].ScalefacCompress];
if ((si.TT[ch, gr].WindowSwitchingFlag == 1) && (si.TT[ch, gr].BlockType == 2))
{
if (si.TT[ch, gr].MixedBlockFlag != 0)
{
bits += (8 * slen1) + (9 * slen1) + (18 * slen2);
}
else
{
bits += (18 * slen1) + (18 * slen2);
}
}
else
{
if ((gr == 0) || (si.Scfsi[ch, 0] == 0))
{
bits += (6 * slen1);
}
if ((gr == 0) || (si.Scfsi[ch, 1] == 0))
{
bits += (5 * slen1);
}
if ((gr == 0) || (si.Scfsi[ch, 2] == 0))
{
bits += (5 * slen2);
}
if ((gr == 0) || (si.Scfsi[ch, 3] == 0))
{
bits += (5 * slen2);
}
}
return(bits);
}
public void Loop(double[,] pe, double[][][] xr_org, double[,,,] ratio_s, double[,,] ratio_l, ref SideInfo l3_side, int[][][] l3_enc, int mean_bits, int chn, double[][][] xr_dec, int[][][] scalefact_l, int[][][][] scalefact_s, ref FrameParams fr_ps, int ancillary_pad, int bitsPerFrame)
{
int max_bits;
int ch, gr, i, sfb, b, scfsi_band;
int mode_gr;
int start, end;
double sum1, sum2, temp, x;
double log2;
double[,,] xmin_l = new double[2, 2, 21];
double[,,,] xmin_s = new double[2, 2, 12, 3];
double[] abs_xr = new double[576];
double[] energy_l = new double[22];
double[,] en_tot = new double[2, 2];
double[,,] en = new double[2, 2, 21];
double[,,] xm = new double[2, 2, 21];
int[,] xrAllZero = new int[2, 2];
int en_tot_krit = 10;
int en_dif_krit = 100;
int en_scfsi_band_krit = 10;
int xm_scfsi_band_krit = 10;
log2 = Math.Log(2.0);
l3_side.ResvDrain = 0;
if (fInit_iteration_loop == 0)
{
l3_side.MainDataBegin = 0;
fInit_iteration_loop = 1;
}
mode_gr = 2;
scalefac_band_long = Tables.SfBandIndex[fr_ps.Header.SamplingFrequency][0];
scalefac_band_short = Tables.SfBandIndex[fr_ps.Header.SamplingFrequency][1];
reserv.ResvFrameBegin(ref fr_ps, ref l3_side, mean_bits, bitsPerFrame);
for (gr = 0; gr < mode_gr; gr++)
{
for (ch = 0; ch < chn; ch++)
{
for (i = 0; i < 576; i++)
{
abs_xr[i] = Math.Abs(xr_org[ch][gr][i]);
}
if (l3_side.TT[ch, gr].WindowSwitchingFlag != 0 && l3_side.TT[ch, gr].BlockType == 2)
{
if (l3_side.TT[ch, gr].MixedBlockFlag != 0)
{
l3_side.TT[ch, gr].SfbLmax = 8;
l3_side.TT[ch, gr].SfbSmax = 3;
}
else
{
l3_side.TT[ch, gr].SfbLmax = 0;
l3_side.TT[ch, gr].SfbSmax = 0;
}
}
else
{
l3_side.TT[ch, gr].SfbLmax = 21;
l3_side.TT[ch, gr].SfbSmax = 12;
}
sum1 = 0;
sum2 = 0;
for (sfb = 0; sfb < 22; sfb++)
{
start = scalefac_band_long[sfb];
end = scalefac_band_long[sfb + 1];
temp = 0;
for (i = start; i < end; i++)
{
if ((x = abs_xr[i]) != 0)
{
temp += x * x;
sum1 += Math.Log(x);
}
}
sum2 += energy_l[sfb] = temp;
if (sfb < l3_side.TT[ch, gr].SfbLmax)
{
xmin_l[ch, gr, sfb] = ratio_l[ch, gr, sfb] * temp / (end - start);
}
}
for (sfb = l3_side.TT[ch, gr].SfbSmax; sfb < 12; sfb++)
{
start = scalefac_band_short[sfb];
end = scalefac_band_short[sfb + 1];
for (b = 0; b < 3; b++)
{
temp = 0.0;
for (i = start; i < end; i++)
{
temp += abs_xr[i * 3 + b] * abs_xr[i * 3 + b];
}
xmin_s[ch, gr, sfb, b] = ratio_s[ch, gr, sfb, b] * temp / (end - start);
}
}
xrAllZero[ch, gr] = 1;
if (l3_side.TT[ch, gr].WindowSwitchingFlag == 0 || (l3_side.TT[ch, gr].BlockType != 2))
{
for (sfb = 0; sfb < 21; sfb++)
{
if (xmin_l[ch, gr, sfb] == 0)
{
xm[ch, gr, sfb] = 0;
}
else
{
xm[ch, gr, sfb] = Math.Log(xmin_l[ch, gr, sfb]) / log2;
}
}
if (gr == 1)
{
for (scfsi_band = 0; scfsi_band < 4; scfsi_band++)
{
l3_side.Scfsi[ch, scfsi_band] = 0;
}
if (xrAllZero[ch, 0] == 0 || xrAllZero[ch, 1] == 0)
{
if (Math.Abs(en_tot[ch, 0] - en_tot[ch, 1]) < en_tot_krit)
{
temp = 0.0;
for (sfb = 0; sfb < 21; sfb++)
{
temp += Math.Abs(en[ch, 0, sfb] - en[ch, 1, sfb]);
}
if (temp < en_dif_krit)
{
for (scfsi_band = 0; scfsi_band < 4; scfsi_band++)
{
sum1 = 0;
sum2 = 0;
start = scfsi_band_long[scfsi_band];
end = scfsi_band_long[scfsi_band + 1];
for (sfb = start; sfb < end; sfb++)
{
sum1 += Math.Abs(en[ch, 0, sfb] - en[ch, 1, sfb]);
sum2 += Math.Abs(xm[ch, 0, sfb] - xm[ch, 1, sfb]);
}
if (sum1 < en_scfsi_band_krit && sum2 < xm_scfsi_band_krit)
{
l3_side.Scfsi[ch, scfsi_band] = 1;
}
}
}
}
}
}
}
max_bits = reserv.ResvMaxBits(ref fr_ps, ref l3_side, ref pe[ch, gr], mean_bits);
for (sfb = 0; sfb < 21; sfb++)
{
scalefact_l[ch][gr][sfb] = 0;
}
for (sfb = 0; sfb < 12; sfb++)
{
for (b = 0; b < 3; b++)
{
scalefact_s[ch][gr][sfb][b] = 0;
}
}
for (scfsi_band = 0; scfsi_band < 4; scfsi_band++)
{
l3_side.TT[ch, gr].Slen[scfsi_band] = 0;
}
l3_side.TT[ch, gr].SfbPartitionTable = nr_of_sfb_block;
l3_side.TT[ch, gr].Part23Length = 0;
l3_side.TT[ch, gr].BigValues = 0;
l3_side.TT[ch, gr].Count1 = 0;
l3_side.TT[ch, gr].ScalefacCompress = 0;
l3_side.TT[ch, gr].TableSelect[0] = 0;
l3_side.TT[ch, gr].TableSelect[1] = 0;
l3_side.TT[ch, gr].TableSelect[2] = 0;
l3_side.TT[ch, gr].SubblockGain[0] = 0;
l3_side.TT[ch, gr].SubblockGain[1] = 0;
l3_side.TT[ch, gr].SubblockGain[2] = 0;
l3_side.TT[ch, gr].Region0Count = 0;
l3_side.TT[ch, gr].Region1Count = 0;
l3_side.TT[ch, gr].Part2Length = 0;
l3_side.TT[ch, gr].Preflag = 0;
l3_side.TT[ch, gr].ScalefacScale = 0;
l3_side.TT[ch, gr].QuantizerStepSize = 0;
l3_side.TT[ch, gr].Count1tableSelect = 0;
int system_const = 8;
int minlimit = -100;
if (sum2 != 0)
{
temp = Nint(system_const * (sum1 / 288 - Math.Log(sum2 / 576)));
if (temp < minlimit)
{
temp = minlimit;
}
temp -= 70;
l3_side.TT[ch, gr].QuantizerStepSize = temp;
l3_side.TT[ch, gr].Part23Length = OuterLoop(abs_xr, max_bits, xmin_l, xmin_s, l3_enc[ch][gr], ref fr_ps, scalefact_l, scalefact_s, gr, ch, ref l3_side);
}
reserv.ResvAdjust(ref fr_ps, ref l3_side.TT[ch, gr], ref l3_side, mean_bits);
l3_side.TT[ch, gr].GlobalGain = Nint(l3_side.TT[ch, gr].QuantizerStepSize + 210.0);
}
}
reserv.ResvFrameEnd(ref fr_ps, ref l3_side, mean_bits);
}
private void EncodeSideInfo(ref SideInfo l3_side, ref FrameParams fr_ps)
{
int bits_sent, mode_gr = 2;
headerPH.Position = 0;
headerPH.Add(4095, 12);
headerPH.Add(1, 1);
headerPH.Add(1, 2);
headerPH.Add(fr_ps.Header.ErrorProtection, 1);
headerPH.Add(fr_ps.Header.BitrateIndex, 4);
headerPH.Add(fr_ps.Header.SamplingFrequency, 2);
headerPH.Add(fr_ps.Header.Padding, 1);
headerPH.Add(fr_ps.Header.Extension, 1);
headerPH.Add(fr_ps.Header.Mode, 2);
headerPH.Add(fr_ps.Header.ModeExt, 2);
headerPH.Add(fr_ps.Header.Copyright, 1);
headerPH.Add(fr_ps.Header.Original, 1);
headerPH.Add(fr_ps.Header.Emphasis, 2);
bits_sent = 32;
frameSIPH.Position = 0;
for (int ch = 0; ch < fr_ps.Chn; ch++)
{
channelSIPH[ch].Position = 0;
}
for (int gr = 0; gr < 2; gr++)
{
for (int ch = 0; ch < fr_ps.Chn; ch++)
{
spectrumSIPH[ch, gr].Position = 0;
}
}
if (fr_ps.Header.ErrorProtection == 0)
{
headerPH.Add(0, 16);
bits_sent += 16;
}
frameSIPH.Add(l3_side.MainDataBegin, 9);
if (fr_ps.Chn == 2)
{
frameSIPH.Add(l3_side.PrivateBits, 3);
}
else
{
frameSIPH.Add(l3_side.PrivateBits, 5);
}
for (int ch = 0; ch < fr_ps.Chn; ch++)
{
for (int scfsi_band = 0; scfsi_band < 4; scfsi_band++)
{
channelSIPH[ch].Add(l3_side.Scfsi[ch, scfsi_band], 1);
}
}
for (int gr = 0; gr < mode_gr; gr++)
{
for (int ch = 0; ch < fr_ps.Chn; ch++)
{
spectrumSIPH[ch, gr].Add(l3_side.TT[ch, gr].Part23Length, 12);
spectrumSIPH[ch, gr].Add(l3_side.TT[ch, gr].BigValues, 9);
spectrumSIPH[ch, gr].Add(l3_side.TT[ch, gr].GlobalGain, 8);
spectrumSIPH[ch, gr].Add(l3_side.TT[ch, gr].ScalefacCompress, 4);
spectrumSIPH[ch, gr].Add(l3_side.TT[ch, gr].WindowSwitchingFlag, 1);
if (l3_side.TT[ch, gr].WindowSwitchingFlag != 0)
{
spectrumSIPH[ch, gr].Add(l3_side.TT[ch, gr].BlockType, 2);
spectrumSIPH[ch, gr].Add(l3_side.TT[ch, gr].MixedBlockFlag, 1);
for (int region = 0; region < 2; region++)
{
spectrumSIPH[ch, gr].Add(l3_side.TT[ch, gr].TableSelect[region], 5);
}
for (int window = 0; window < 3; window++)
{
spectrumSIPH[ch, gr].Add(l3_side.TT[ch, gr].SubblockGain[window], 3);
}
}
else
{
for (int region = 0; region < 3; region++)
{
spectrumSIPH[ch, gr].Add(l3_side.TT[ch, gr].TableSelect[region], 5);
}
spectrumSIPH[ch, gr].Add(l3_side.TT[ch, gr].Region0Count, 4);
spectrumSIPH[ch, gr].Add(l3_side.TT[ch, gr].Region1Count, 3);
}
spectrumSIPH[ch, gr].Add(l3_side.TT[ch, gr].Preflag, 1);
spectrumSIPH[ch, gr].Add(l3_side.TT[ch, gr].ScalefacScale, 1);
spectrumSIPH[ch, gr].Add(l3_side.TT[ch, gr].Count1tableSelect, 1);
}
}
if (fr_ps.Chn == 2)
{
bits_sent += 256;
}
else
{
bits_sent += 136;
}
}
public byte[] WriteToBitStream(int bitsPerFrame, ref FrameParams fr_ps, int[][][] l3_enc, ref SideInfo l3_side, int[][][] scalefact_l, int[][][][] scalefact_s, double[][][] xr, byte[] ancillary, int ancillary_bits)
{
OutputBit = 8;
int mode_gr = 2;
for (int gr = 0; gr < mode_gr; gr++)
{
for (int ch = 0; ch < fr_ps.Chn; ch++)
{
for (int i = 0; i < 576; i++)
{
if ((xr[ch][gr][i] < 0) && (l3_enc[ch][gr][i] > 0))
{
l3_enc[ch][gr][i] *= -1;
}
}
}
}
EncodeSideInfo(ref l3_side, ref fr_ps);
EncodeMainData(l3_enc, ref l3_side, ref fr_ps, scalefact_l, scalefact_s);
WriteAncillaryData(ancillary, ancillary_bits);
if (l3_side.ResvDrain != 0)
{
DrainIntoAncillaryData(l3_side.ResvDrain);
}
SFrameData = new FrameData(bitsPerFrame, mode_gr, fr_ps.Chn, headerPH, frameSIPH, channelSIPH, spectrumSIPH, scaleFactorsPH, codedDataPH, userSpectrumPH, userFrameDataPH);
sFrameResults = new FrameResults();
WriteFrame(ref SFrameData, ref sFrameResults);
l3_side.MainDataBegin = sFrameResults.NextBackPtr;
return(EncodedOutput);
}
private void EncodeMainData(int[][][] l3_enc, ref SideInfo l3_side, ref FrameParams fr_ps, int[][][] scalefact_l, int[][][][] scalefact_s)
{
int slen1, slen2, mode_gr = 2;
for (int gr = 0; gr < mode_gr; gr++)
{
for (int ch = 0; ch < fr_ps.Chn; ch++)
{
scaleFactorsPH[ch, gr].Position = 0;
}
}
for (int gr = 0; gr < mode_gr; gr++)
{
for (int ch = 0; ch < fr_ps.Chn; ch++)
{
codedDataPH[ch, gr].Position = 0;
}
}
for (int gr = 0; gr < mode_gr; gr++)
{
for (int ch = 0; ch < fr_ps.Chn; ch++)
{
slen1 = Tables.Slen1Tab[l3_side.TT[ch, gr].ScalefacCompress];
slen2 = Tables.Slen2Tab[l3_side.TT[ch, gr].ScalefacCompress];
if ((l3_side.TT[ch, gr].WindowSwitchingFlag == 1) && (l3_side.TT[ch, gr].BlockType == 2))
{
if (l3_side.TT[ch, gr].MixedBlockFlag != 0)
{
for (int sfb = 0; sfb < 8; sfb++)
{
scaleFactorsPH[ch, gr].Add(scalefact_l[ch][gr][sfb], slen1);
}
for (int sfb = 3; sfb < 6; sfb++)
{
for (int window = 0; window < 3; window++)
{
scaleFactorsPH[ch, gr].Add(scalefact_s[ch][gr][sfb][window], slen1);
}
}
for (int sfb = 6; sfb < 12; sfb++)
{
for (int window = 0; window < 3; window++)
{
scaleFactorsPH[ch, gr].Add(scalefact_s[ch][gr][sfb][window], slen2);
}
}
}
else
{
for (int sfb = 0; sfb < 6; sfb++)
{
for (int window = 0; window < 3; window++)
{
scaleFactorsPH[ch, gr].Add(scalefact_s[gr][ch][sfb][window], slen1);
}
}
for (int sfb = 6; sfb < 12; sfb++)
{
for (int window = 0; window < 3; window++)
{
scaleFactorsPH[ch, gr].Add(scalefact_s[ch][gr][sfb][window], slen2);
}
}
}
}
else
{
if ((gr == 0) || (l3_side.Scfsi[ch, 0] == 0))
{
for (int sfb = 0; sfb < 6; sfb++)
{
scaleFactorsPH[ch, gr].Add(scalefact_l[ch][gr][sfb], slen1);
}
}
if ((gr == 0) || (l3_side.Scfsi[ch, 1] == 0))
{
for (int sfb = 6; sfb < 11; sfb++)
{
scaleFactorsPH[ch, gr].Add(scalefact_l[ch][gr][sfb], slen1);
}
}
if ((gr == 0) || (l3_side.Scfsi[ch, 2] == 0))
{
for (int sfb = 11; sfb < 16; sfb++)
{
scaleFactorsPH[ch, gr].Add(scalefact_l[ch][gr][sfb], slen2);
}
}
if ((gr == 0) || (l3_side.Scfsi[ch, 3] == 0))
{
for (int sfb = 16; sfb < 21; sfb++)
{
scaleFactorsPH[ch, gr].Add(scalefact_l[ch][gr][sfb], slen2);
}
}
}
HuffmanCodeBits(ch, gr, l3_enc[ch][gr], ref l3_side.TT[ch, gr], ref fr_ps);
}
}
}
public static string Encode(string path, int bitrate, string title, string artist, string album, string year, string comment, byte zero, byte num, byte genre, System.ComponentModel.BackgroundWorker backgroundWorker)
{
int[,] savebuf = new int[2, 1344];
int[,] buf = new int[2, 1152];
int[,,] grbuf = new int[2, 2, 576];
double[][][][] xr;
double[][][] xr1;
int[][][] l3_enc = new int[2][][];
for (int i1 = 0; i1 < 2; i1++)
{
l3_enc[i1] = new int[2][];
for (int i2 = 0; i2 < 2; i2++)
{
l3_enc[i1][i2] = new int[576];
}
}
double[][][] xr_dec = new double[2][][];
for (int i1 = 0; i1 < 2; i1++)
{
xr_dec[i1] = new double[2][];
for (int i2 = 0; i2 < 2; i2++)
{
xr_dec[i1][i2] = new double[576];
}
}
int[][][] scalefact_l = new int[2][][];
for (int i1 = 0; i1 < 2; i1++)
{
scalefact_l[i1] = new int[2][];
for (int i2 = 0; i2 < 2; i2++)
{
scalefact_l[i1][i2] = new int[21];
}
}
int[][][][] scalefact_s = new int[2][][][];
for (int i1 = 0; i1 < 2; i1++)
{
scalefact_s[i1] = new int[2][][];
for (int i2 = 0; i2 < 2; i2++)
{
scalefact_s[i1][i2] = new int[12][];
for (int i3 = 0; i3 < 12; i3++)
{
scalefact_s[i1][i2][i3] = new int[3];
}
}
}
SideInfo l3_side = new SideInfo();
FrameParams fr_ps = new FrameParams();
BitAndNoizeAlloc bna = new BitAndNoizeAlloc();
FormatBitStream fbs = new FormatBitStream();
int counter = 0;
int ancillary_pad = 0;
int bitsPerFrame = 0;
int meanBits = 0;
double[,,] ratio_d = new double[2, 2, 21];
double[,,,] ratio_ds = new double[2, 2, 12, 3];
double[,] pe = new double[2, 2];
int[,] sw_fl = new int[2, 2], bl_fl = new int[2, 2], wintp = new int[2, 2];
byte[] Song = File.ReadAllBytes(path); //чтение файла с PCM и запись в массив байтов
int chn = BitConverter.ToInt16(Song, 22); //кол-во каналов
int smplr = BitConverter.ToInt32(Song, 24); //частота семплирования
int bps = BitConverter.ToInt16(Song, 34) / 8; //размер одного семпла
int size = BitConverter.ToInt32(Song, 40); //размер области с данными
int[,] s = new int[chn, (Song.Length - 44) / (chn * bps)];
double[][][][] sb_gr = new double[2][][][];
if (bps != 2 && bps != 4 && bps != 3)
{
throw new Exception("Неподдерживаемое разрешение");
}
for (int i1 = 0; i1 < 2; i1++)
{
sb_gr[i1] = new double[3][][];
for (int i2 = 0; i2 < 3; i2++)
{
sb_gr[i1][i2] = new double[18][];
for (int i3 = 0; i3 < 18; i3++)
{
sb_gr[i1][i2][i3] = new double[32];
}
}
}
Layer info = new Layer();
MDCT subber = new MDCT();
switch (smplr)
{
case 48000:
info.SamplingFrequency = 1;
break;
case 44100:
info.SamplingFrequency = 0;
break;
case 32000:
info.SamplingFrequency = 2;
break;
default:
throw new Exception("Неподдерживаемая частота семплирования");
}
switch (chn)
{
case 0:
info.Mode = 0;
info.ModeExt = 0;
break;
case 2:
info.Mode = 2;
info.ModeExt = 0;
break;
case 1:
info.Mode = 3;
info.ModeExt = 0;
break;
default:
throw new Exception("Неправильный формат данных");
}
int j = 0;
while (j < 15)
{
if (bitratex[1][j] == bitrate)
{
break;
}
j++;
}
info.BitrateIndex = j;
info.Version = 1;
info.Emphasis = 0;
info.Extension = 0;
info.Copyright = 0;
info.Original = 1;
info.ErrorProtection = 1;
fr_ps.Header = info;
fr_ps.Chn = chn;
fr_ps.TabNum = -1;
fr_ps.Alloc = null;
fr_ps.ActualMode = info.Mode;
fr_ps.Sblimit = 32;
fr_ps.Jsbound = 32;
double avg_slots_per_frame = (1152 / s_freq[1][info.SamplingFrequency]) * (bitratex[1][info.BitrateIndex] / 8.0);
int whole_SpF = (int)avg_slots_per_frame;
double frac_SpF = avg_slots_per_frame - whole_SpF;
double slot_lag = -frac_SpF;
int extra_slot;
if (frac_SpF == 0)
{
fr_ps.Header.Padding = 0;
}
if (frac_SpF != 0)
{
if (slot_lag > (frac_SpF - 1.0))
{
slot_lag -= frac_SpF;
extra_slot = 0;
fr_ps.Header.Padding = 0;
}
else
{
extra_slot = 1;
fr_ps.Header.Padding = 1;
slot_lag += (1 - frac_SpF);
}
}
int sideinfo_len = 32;
if (chn == 1)
{
sideinfo_len += 136;
}
else
{
sideinfo_len += 256;
}
if (fr_ps.Header.ErrorProtection == 0)
{
sideinfo_len += 16;
}
bitsPerFrame = 8 * whole_SpF + (fr_ps.Header.Padding * 8);
meanBits = (bitsPerFrame - sideinfo_len) / 2;
PsyAcoustic Obj = new PsyAcoustic(smplr); // инициализация психоакустической модели
for (int i = 44; i < Song.Length - 44;) //массив со значениями PCM
{
for (int ch = 0; ch < chn; ch++, i += bps)
{
switch (bps)
{
case 2:
s[ch, (i - 44) / (bps * chn)] = BitConverter.ToInt16(Song, i);
break;
case 3:
s[ch, (i - 44) / (bps * chn)] = ToInt24(Song[i], Song[i + 1], Song[i + 2]);
break;
case 4:
s[ch, (i - 44) / (bps * chn)] = BitConverter.ToInt32(Song, i);
break;
default:
throw new ArgumentException();
}
}
}
string outpath = Path.GetDirectoryName(path) + @"\" + Path.GetFileNameWithoutExtension(path) + ".mp3";
BinaryWriter bw = new BinaryWriter(File.Open(outpath, FileMode.Create));
counter = 0;
double end = Math.Floor((double)(s.GetLength(1)) / 1152);
for (int k = 0; k < end; k++)
{
xr = new double[2][][][];
for (int i1 = 0; i1 < 2; i1++)
{
xr[i1] = new double[3][][];
for (int i2 = 0; i2 < 3; i2++)
{
xr[i1][i2] = new double[32][];
for (int i3 = 0; i3 < 32; i3++)
{
xr[i1][i2][i3] = new double[18];
}
}
}
grbuf = Granulation(s, ref counter, buf, chn);
Sub = new double[2][][];
for (int gr = 0; gr < 2; gr++)
{
for (int ch = 0; ch < chn; ch++)
{
Obj.Analize(ch, gr, grbuf, ref savebuf, ref ratio_d, ref ratio_ds, ref pe, ref wintp[ch, gr], ref sw_fl[ch, gr], ref bl_fl[ch, gr]); //применение психоакустической модели
l3_side.TT[ch, gr].WindowSwitchingFlag = sw_fl[ch, gr];
l3_side.TT[ch, gr].BlockType = wintp[ch, gr];
l3_side.TT[ch, gr].MixedBlockFlag = bl_fl[ch, gr];
}
}
for (int ch = 0; ch < chn; ch++)
{
PolyPhase.Subbanding(ch, out Sub[ch], buf); // разделение на 32 подполосы
}
for (int ch = 0; ch < chn; ch++)
{
for (int gr = 0, i0 = 0; gr < 2; gr++)
{
for (int s1 = 0; s1 < 18; s1++, i0++)
{
for (int band = 0; band < 32; band++)
{
sb_gr[ch][gr + 1][s1][band] = Sub[ch][i0][band];
}
}
}
}
subber.Subbanding(sb_gr, xr, chn, wintp, bl_fl);
xr1 = new double[2][][];
for (int ch = 0; ch < chn; ch++)
{
xr1[ch] = new double[2][];
for (int gr = 0; gr < 2; gr++)
{
xr1[ch][gr] = new double[576];
for (int i1 = 0, i3 = 0; i1 < 32; i1++)
{
for (int i2 = 0; i2 < 18; i2++)
{
xr1[ch][gr][i3++] = xr[ch][gr][i1][i2];
}
}
}
}
bna.Loop(pe, xr1, ratio_ds, ratio_d, ref l3_side, l3_enc, meanBits, chn, xr_dec, scalefact_l, scalefact_s, ref fr_ps, ancillary_pad, bitsPerFrame);
byte[] Arr = fbs.WriteToBitStream(bitsPerFrame, ref fr_ps, l3_enc, ref l3_side, scalefact_l, scalefact_s, xr1, null, 0);
for (int i = 0; i < fbs.GetLength(); i++)
{
bw.Write(Arr[i]);
}
if (backgroundWorker.CancellationPending)
{
bw.Close();
return(outpath);
}
if (backgroundWorker.WorkerReportsProgress)
{
double pr = (k * 100) / end;
backgroundWorker.ReportProgress((int)Math.Round(pr));
}
}
byte[] Tag = new byte[128];
byte[] temp = new byte[30];
Array.Copy(ASCIIEncoding.ASCII.GetBytes("TAG"), 0, Tag, 0, 3);
Array.Copy(ASCIIEncoding.ASCII.GetBytes(title), 0, temp, 0, title.Length);
Array.Copy(temp, 0, Tag, 3, 30);
temp = new byte[30];
Array.Copy(ASCIIEncoding.ASCII.GetBytes(artist), 0, temp, 0, artist.Length);
Array.Copy(temp, 0, Tag, 33, 30);
temp = new byte[30];
Array.Copy(ASCIIEncoding.ASCII.GetBytes(album), 0, temp, 0, album.Length);
Array.Copy(temp, 0, Tag, 63, 30);
temp = new byte[30];
Array.Copy(ASCIIEncoding.ASCII.GetBytes(year), 0, temp, 0, year.Length);
Array.Copy(temp, 0, Tag, 93, 30);
temp = new byte[28];
Array.Copy(ASCIIEncoding.ASCII.GetBytes(comment), 0, temp, 0, comment.Length);
Array.Copy(temp, 0, Tag, 97, 28);
Tag[125] = zero;
Tag[126] = num;
Tag[127] = genre;
bw.Write(Tag);
bw.Close();
return(outpath);
}