public int Encode(G722CodecState state, byte[] outputBuffer, short[] inputBuffer, int inputBufferCount)
{
int result = 0;
int num = 0;
int i = 0;
while (i < inputBufferCount)
{
int num2;
int j;
if (state.ItuTestMode)
{
num = (num2 = inputBuffer[i++] >> 1);
}
else if (state.EncodeFrom8000Hz)
{
num2 = inputBuffer[i++] >> 1;
}
else
{
for (j = 0; j < 22; j++)
{
state.QmfSignalHistory[j] = state.QmfSignalHistory[j + 2];
}
state.QmfSignalHistory[22] = (int)inputBuffer[i++];
state.QmfSignalHistory[23] = (int)inputBuffer[i++];
int num3 = 0;
int num4 = 0;
for (j = 0; j < 12; j++)
{
num4 += state.QmfSignalHistory[2 * j] * G722Codec.qmf_coeffs[j];
num3 += state.QmfSignalHistory[2 * j + 1] * G722Codec.qmf_coeffs[11 - j];
}
num2 = num3 + num4 >> 14;
num = num3 - num4 >> 14;
}
int num5 = (int)G722Codec.Saturate(num2 - state.Band[0].s);
int num6 = (num5 >= 0) ? num5 : (-(num5 + 1));
int num7;
for (j = 1; j < 30; j++)
{
num7 = G722Codec.q6[j] * state.Band[0].det >> 12;
if (num6 < num7)
{
break;
}
}
int num8 = (num5 < 0) ? G722Codec.iln[j] : G722Codec.ilp[j];
int num9 = num8 >> 2;
int num10 = G722Codec.qm4[num9];
int d = state.Band[0].det * num10 >> 15;
int num11 = G722Codec.rl42[num9];
num6 = state.Band[0].nb * 127 >> 7;
state.Band[0].nb = num6 + G722Codec.wl[num11];
if (state.Band[0].nb < 0)
{
state.Band[0].nb = 0;
}
else if (state.Band[0].nb > 18432)
{
state.Band[0].nb = 18432;
}
num7 = (state.Band[0].nb >> 6 & 31);
num10 = 8 - (state.Band[0].nb >> 11);
int num12 = (num10 < 0) ? (G722Codec.ilb[num7] << -num10) : (G722Codec.ilb[num7] >> num10);
state.Band[0].det = num12 << 2;
G722Codec.Block4(state, 0, d);
int num13;
if (state.EncodeFrom8000Hz)
{
num13 = (192 | num8) >> 8 - state.BitsPerSample;
}
else
{
int num14 = (int)G722Codec.Saturate(num - state.Band[1].s);
num6 = ((num14 >= 0) ? num14 : (-(num14 + 1)));
num7 = 564 * state.Band[1].det >> 12;
int num15 = (num6 >= num7) ? 2 : 1;
int num16 = (num14 < 0) ? G722Codec.ihn[num15] : G722Codec.ihp[num15];
num10 = G722Codec.qm2[num16];
int d2 = state.Band[1].det * num10 >> 15;
int num17 = G722Codec.rh2[num16];
num6 = state.Band[1].nb * 127 >> 7;
state.Band[1].nb = num6 + G722Codec.wh[num17];
if (state.Band[1].nb < 0)
{
state.Band[1].nb = 0;
}
else if (state.Band[1].nb > 22528)
{
state.Band[1].nb = 22528;
}
num7 = (state.Band[1].nb >> 6 & 31);
num10 = 10 - (state.Band[1].nb >> 11);
num12 = ((num10 < 0) ? (G722Codec.ilb[num7] << -num10) : (G722Codec.ilb[num7] >> num10));
state.Band[1].det = num12 << 2;
G722Codec.Block4(state, 1, d2);
num13 = (num16 << 6 | num8) >> 8 - state.BitsPerSample;
}
if (state.Packed)
{
state.OutBuffer |= (uint)((uint)num13 << state.OutBits);
state.OutBits += state.BitsPerSample;
if (state.OutBits >= 8)
{
outputBuffer[result++] = (byte)(state.OutBuffer & 255u);
state.OutBits -= 8;
state.OutBuffer >>= 8;
}
}
else
{
outputBuffer[result++] = (byte)num13;
}
}
return(result);
}
private static void Block4(G722CodecState s, int band, int d)
{
s.Band[band].d[0] = d;
s.Band[band].r[0] = (int)G722Codec.Saturate(s.Band[band].s + d);
s.Band[band].p[0] = (int)G722Codec.Saturate(s.Band[band].sz + d);
for (int i = 0; i < 3; i++)
{
s.Band[band].sg[i] = s.Band[band].p[i] >> 15;
}
int num = (int)G722Codec.Saturate(s.Band[band].a[1] << 2);
int num2 = (s.Band[band].sg[0] == s.Band[band].sg[1]) ? (-num) : num;
if (num2 > 32767)
{
num2 = 32767;
}
int num3 = (s.Band[band].sg[0] == s.Band[band].sg[2]) ? 128 : -128;
num3 += num2 >> 7;
num3 += s.Band[band].a[2] * 32512 >> 15;
if (num3 > 12288)
{
num3 = 12288;
}
else if (num3 < -12288)
{
num3 = -12288;
}
s.Band[band].ap[2] = num3;
s.Band[band].sg[0] = s.Band[band].p[0] >> 15;
s.Band[band].sg[1] = s.Band[band].p[1] >> 15;
num = ((s.Band[band].sg[0] == s.Band[band].sg[1]) ? 192 : -192);
num2 = s.Band[band].a[1] * 32640 >> 15;
s.Band[band].ap[1] = (int)G722Codec.Saturate(num + num2);
num3 = (int)G722Codec.Saturate(15360 - s.Band[band].ap[2]);
if (s.Band[band].ap[1] > num3)
{
s.Band[band].ap[1] = num3;
}
else if (s.Band[band].ap[1] < -num3)
{
s.Band[band].ap[1] = -num3;
}
num = ((d == 0) ? 0 : 128);
s.Band[band].sg[0] = d >> 15;
for (int i = 1; i < 7; i++)
{
s.Band[band].sg[i] = s.Band[band].d[i] >> 15;
num2 = ((s.Band[band].sg[i] == s.Band[band].sg[0]) ? num : (-num));
num3 = s.Band[band].b[i] * 32640 >> 15;
s.Band[band].bp[i] = (int)G722Codec.Saturate(num2 + num3);
}
for (int i = 6; i > 0; i--)
{
s.Band[band].d[i] = s.Band[band].d[i - 1];
s.Band[band].b[i] = s.Band[band].bp[i];
}
for (int i = 2; i > 0; i--)
{
s.Band[band].r[i] = s.Band[band].r[i - 1];
s.Band[band].p[i] = s.Band[band].p[i - 1];
s.Band[band].a[i] = s.Band[band].ap[i];
}
num = (int)G722Codec.Saturate(s.Band[band].r[1] + s.Band[band].r[1]);
num = s.Band[band].a[1] * num >> 15;
num2 = (int)G722Codec.Saturate(s.Band[band].r[2] + s.Band[band].r[2]);
num2 = s.Band[band].a[2] * num2 >> 15;
s.Band[band].sp = (int)G722Codec.Saturate(num + num2);
s.Band[band].sz = 0;
for (int i = 6; i > 0; i--)
{
num = (int)G722Codec.Saturate(s.Band[band].d[i] + s.Band[band].d[i]);
s.Band[band].sz += s.Band[band].b[i] * num >> 15;
}
s.Band[band].sz = (int)G722Codec.Saturate(s.Band[band].sz);
s.Band[band].s = (int)G722Codec.Saturate(s.Band[band].sp + s.Band[band].sz);
}