public int Decode(G722CodecState state, short[] outputBuffer, byte[] inputG722Data, int inputLength)
{
int result = 0;
int num = 0;
int i = 0;
while (i < inputLength)
{
int num2;
if (state.Packed)
{
if (state.InBits < state.BitsPerSample)
{
state.InBuffer |= (uint)((uint)inputG722Data[i++] << state.InBits);
state.InBits += 8;
}
num2 = (int)(state.InBuffer & (1u << state.BitsPerSample) - 1u);
state.InBuffer >>= state.BitsPerSample;
state.InBits -= state.BitsPerSample;
}
else
{
num2 = (int)inputG722Data[i++];
}
int num3;
int num4;
int num5;
switch (state.BitsPerSample)
{
case 6:
num3 = (num2 & 15);
num4 = (num2 >> 4 & 3);
num5 = G722Codec.qm4[num3];
break;
case 7:
num3 = (num2 & 31);
num4 = (num2 >> 5 & 3);
num5 = G722Codec.qm5[num3];
num3 >>= 1;
break;
default:
num3 = (num2 & 63);
num4 = (num2 >> 6 & 3);
num5 = G722Codec.qm6[num3];
num3 >>= 2;
break;
}
num5 = state.Band[0].det * num5 >> 15;
int num6 = state.Band[0].s + num5;
if (num6 > 16383)
{
num6 = 16383;
}
else if (num6 < -16384)
{
num6 = -16384;
}
num5 = G722Codec.qm4[num3];
int d = state.Band[0].det * num5 >> 15;
num5 = G722Codec.rl42[num3];
num3 = state.Band[0].nb * 127 >> 7;
num3 += G722Codec.wl[num5];
if (num3 < 0)
{
num3 = 0;
}
else if (num3 > 18432)
{
num3 = 18432;
}
state.Band[0].nb = num3;
num3 = (state.Band[0].nb >> 6 & 31);
num5 = 8 - (state.Band[0].nb >> 11);
int num7 = (num5 < 0) ? (G722Codec.ilb[num3] << -num5) : (G722Codec.ilb[num3] >> num5);
state.Band[0].det = num7 << 2;
G722Codec.Block4(state, 0, d);
if (!state.EncodeFrom8000Hz)
{
num5 = G722Codec.qm2[num4];
int num8 = state.Band[1].det * num5 >> 15;
num = num8 + state.Band[1].s;
if (num > 16383)
{
num = 16383;
}
else if (num < -16384)
{
num = -16384;
}
num5 = G722Codec.rh2[num4];
num3 = state.Band[1].nb * 127 >> 7;
num3 += G722Codec.wh[num5];
if (num3 < 0)
{
num3 = 0;
}
else if (num3 > 22528)
{
num3 = 22528;
}
state.Band[1].nb = num3;
num3 = (state.Band[1].nb >> 6 & 31);
num5 = 10 - (state.Band[1].nb >> 11);
num7 = ((num5 < 0) ? (G722Codec.ilb[num3] << -num5) : (G722Codec.ilb[num3] >> num5));
state.Band[1].det = num7 << 2;
G722Codec.Block4(state, 1, num8);
}
if (state.ItuTestMode)
{
outputBuffer[result++] = (short)(num6 << 1);
outputBuffer[result++] = (short)(num << 1);
}
else if (state.EncodeFrom8000Hz)
{
outputBuffer[result++] = (short)(num6 << 1);
}
else
{
for (int j = 0; j < 22; j++)
{
state.QmfSignalHistory[j] = state.QmfSignalHistory[j + 2];
}
state.QmfSignalHistory[22] = num6 + num;
state.QmfSignalHistory[23] = num6 - num;
int num9 = 0;
int num10 = 0;
for (int j = 0; j < 12; j++)
{
num10 += state.QmfSignalHistory[2 * j] * G722Codec.qmf_coeffs[j];
num9 += state.QmfSignalHistory[2 * j + 1] * G722Codec.qmf_coeffs[11 - j];
}
outputBuffer[result++] = (short)(num9 >> 11);
outputBuffer[result++] = (short)(num10 >> 11);
}
}
return(result);
}
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);
}
