public G722ChatCodec()
{
bitrate = 64000;
encoderState = new G722CodecState(bitrate, G722Flags.None);
decoderState = new G722CodecState(bitrate, G722Flags.None);
codec = new G722Codec();
recordingFormat = new WaveFormat(16000, 1);
}
public G722ChatCodec()
{
this.bitrate = 64000;
this.encoderState = new G722CodecState(bitrate, G722Flags.None);
this.decoderState = new G722CodecState(bitrate, G722Flags.None);
this.codec = new G722Codec();
this.recordingFormat = new WaveFormat(16000, 1);
}
public G722ChatCodec()
{
_bitrate = 64000;
_encoderState = new G722CodecState(_bitrate, G722Flags.None);
_decoderState = new G722CodecState(_bitrate, G722Flags.None);
_codec = new G722Codec();
RecordFormat = new WaveFormat(16000, 1);
}
static void Block4(G722CodecState s, int band, int d)
{
int wd1;
int wd2;
int wd3;
int i;
// Block 4, RECONS
s.Band[band].d[0] = d;
s.Band[band].r[0] = Saturate(s.Band[band].s + d);
// Block 4, PARREC
s.Band[band].p[0] = Saturate(s.Band[band].sz + d);
// Block 4, UPPOL2
for (i = 0; i < 3; i++)
{
s.Band[band].sg[i] = s.Band[band].p[i] >> 15;
}
wd1 = Saturate(s.Band[band].a[1] << 2);
wd2 = (s.Band[band].sg[0] == s.Band[band].sg[1]) ? -wd1 : wd1;
if (wd2 > 32767)
{
wd2 = 32767;
}
wd3 = (s.Band[band].sg[0] == s.Band[band].sg[2]) ? 128 : -128;
wd3 += (wd2 >> 7);
wd3 += (s.Band[band].a[2] * 32512) >> 15;
if (wd3 > 12288)
{
wd3 = 12288;
}
else if (wd3 < -12288)
{
wd3 = -12288;
}
s.Band[band].ap[2] = wd3;
// Block 4, UPPOL1
s.Band[band].sg[0] = s.Band[band].p[0] >> 15;
s.Band[band].sg[1] = s.Band[band].p[1] >> 15;
wd1 = (s.Band[band].sg[0] == s.Band[band].sg[1]) ? 192 : -192;
wd2 = (s.Band[band].a[1] * 32640) >> 15;
s.Band[band].ap[1] = Saturate(wd1 + wd2);
wd3 = Saturate(15360 - s.Band[band].ap[2]);
if (s.Band[band].ap[1] > wd3)
{
s.Band[band].ap[1] = wd3;
}
else if (s.Band[band].ap[1] < -wd3)
{
s.Band[band].ap[1] = -wd3;
}
// Block 4, UPZERO
wd1 = (d == 0) ? 0 : 128;
s.Band[band].sg[0] = d >> 15;
for (i = 1; i < 7; i++)
{
s.Band[band].sg[i] = s.Band[band].d[i] >> 15;
wd2 = (s.Band[band].sg[i] == s.Band[band].sg[0]) ? wd1 : -wd1;
wd3 = (s.Band[band].b[i] * 32640) >> 15;
s.Band[band].bp[i] = Saturate(wd2 + wd3);
}
// Block 4, DELAYA
for (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 (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];
}
// Block 4, FILTEP
wd1 = Saturate(s.Band[band].r[1] + s.Band[band].r[1]);
wd1 = (s.Band[band].a[1] * wd1) >> 15;
wd2 = Saturate(s.Band[band].r[2] + s.Band[band].r[2]);
wd2 = (s.Band[band].a[2] * wd2) >> 15;
s.Band[band].sp = Saturate(wd1 + wd2);
// Block 4, FILTEZ
s.Band[band].sz = 0;
for (i = 6; i > 0; i--)
{
wd1 = Saturate(s.Band[band].d[i] + s.Band[band].d[i]);
s.Band[band].sz += (s.Band[band].b[i] * wd1) >> 15;
}
s.Band[band].sz = Saturate(s.Band[band].sz);
// Block 4, PREDIC
s.Band[band].s = Saturate(s.Band[band].sp + s.Band[band].sz);
}
/// <summary>
/// Encodes a buffer of G722
/// </summary>
/// <param name="state">Codec state</param>
/// <param name="outputBuffer">Output buffer (to contain encoded G722)</param>
/// <param name="inputBuffer">PCM 16 bit samples to encode</param>
/// <param name="inputBufferCount">Number of samples in the input buffer to encode</param>
/// <returns>Number of encoded bytes written into output buffer</returns>
public int Encode(G722CodecState state, byte[] outputBuffer, short[] inputBuffer, int inputBufferCount)
{
int dlow;
int dhigh;
int el;
int wd;
int wd1;
int ril;
int wd2;
int il4;
int ih2;
int wd3;
int eh;
int mih;
int i;
int j;
// Low and high band PCM from the QMF
int xlow;
int xhigh;
int g722_bytes;
// Even and odd tap accumulators
int sumeven;
int sumodd;
int ihigh;
int ilow;
int code;
g722_bytes = 0;
xhigh = 0;
for (j = 0; j < inputBufferCount;)
{
if (state.ItuTestMode)
{
xlow =
xhigh = inputBuffer[j++] >> 1;
}
else
{
if (state.EncodeFrom8000Hz)
{
xlow = inputBuffer[j++] >> 1;
}
else
{
// Apply the transmit QMF
// Shuffle the buffer down
for (i = 0; i < 22; i++)
{
state.QmfSignalHistory[i] = state.QmfSignalHistory[i + 2];
}
state.QmfSignalHistory[22] = inputBuffer[j++];
state.QmfSignalHistory[23] = inputBuffer[j++];
// Discard every other QMF output
sumeven = 0;
sumodd = 0;
for (i = 0; i < 12; i++)
{
sumodd += state.QmfSignalHistory[2 * i] * qmf_coeffs[i];
sumeven += state.QmfSignalHistory[2 * i + 1] * qmf_coeffs[11 - i];
}
xlow = (sumeven + sumodd) >> 14;
xhigh = (sumeven - sumodd) >> 14;
}
}
// Block 1L, SUBTRA
el = Saturate(xlow - state.Band[0].s);
// Block 1L, QUANTL
wd = (el >= 0) ? el : -(el + 1);
for (i = 1; i < 30; i++)
{
wd1 = (q6[i] * state.Band[0].det) >> 12;
if (wd < wd1)
{
break;
}
}
ilow = (el < 0) ? iln[i] : ilp[i];
// Block 2L, INVQAL
ril = ilow >> 2;
wd2 = qm4[ril];
dlow = (state.Band[0].det * wd2) >> 15;
// Block 3L, LOGSCL
il4 = rl42[ril];
wd = (state.Band[0].nb * 127) >> 7;
state.Band[0].nb = wd + wl[il4];
if (state.Band[0].nb < 0)
{
state.Band[0].nb = 0;
}
else if (state.Band[0].nb > 18432)
{
state.Band[0].nb = 18432;
}
// Block 3L, SCALEL
wd1 = (state.Band[0].nb >> 6) & 31;
wd2 = 8 - (state.Band[0].nb >> 11);
wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2);
state.Band[0].det = wd3 << 2;
Block4(state, 0, dlow);
if (state.EncodeFrom8000Hz)
{
// Just leave the high bits as zero
code = (0xC0 | ilow) >> (8 - state.BitsPerSample);
}
else
{
// Block 1H, SUBTRA
eh = Saturate(xhigh - state.Band[1].s);
// Block 1H, QUANTH
wd = (eh >= 0) ? eh : -(eh + 1);
wd1 = (564 * state.Band[1].det) >> 12;
mih = (wd >= wd1) ? 2 : 1;
ihigh = (eh < 0) ? ihn[mih] : ihp[mih];
// Block 2H, INVQAH
wd2 = qm2[ihigh];
dhigh = (state.Band[1].det * wd2) >> 15;
// Block 3H, LOGSCH
ih2 = rh2[ihigh];
wd = (state.Band[1].nb * 127) >> 7;
state.Band[1].nb = wd + wh[ih2];
if (state.Band[1].nb < 0)
{
state.Band[1].nb = 0;
}
else if (state.Band[1].nb > 22528)
{
state.Band[1].nb = 22528;
}
// Block 3H, SCALEH
wd1 = (state.Band[1].nb >> 6) & 31;
wd2 = 10 - (state.Band[1].nb >> 11);
wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2);
state.Band[1].det = wd3 << 2;
Block4(state, 1, dhigh);
code = ((ihigh << 6) | ilow) >> (8 - state.BitsPerSample);
}
if (state.Packed)
{
// Pack the code bits
state.OutBuffer |= (uint)(code << state.OutBits);
state.OutBits += state.BitsPerSample;
if (state.OutBits >= 8)
{
outputBuffer[g722_bytes++] = (byte)(state.OutBuffer & 0xFF);
state.OutBits -= 8;
state.OutBuffer >>= 8;
}
}
else
{
outputBuffer[g722_bytes++] = (byte)code;
}
}
return(g722_bytes);
}
/// <summary>
/// Decodes a buffer of G722
/// </summary>
/// <param name="state">Codec state</param>
/// <param name="outputBuffer">Output buffer (to contain decompressed PCM samples)</param>
/// <param name="inputG722Data"></param>
/// <param name="inputLength">Number of bytes in input G722 data to decode</param>
/// <returns>Number of samples written into output buffer</returns>
public int Decode(G722CodecState state, short[] outputBuffer, byte[] inputG722Data, int inputLength)
{
int dlowt;
int rlow;
int ihigh;
int dhigh;
int rhigh;
int xout1;
int xout2;
int wd1;
int wd2;
int wd3;
int code;
int outlen;
int i;
int j;
outlen = 0;
rhigh = 0;
for (j = 0; j < inputLength;)
{
if (state.Packed)
{
// Unpack the code bits
if (state.InBits < state.BitsPerSample)
{
state.InBuffer |= (uint)(inputG722Data[j++] << state.InBits);
state.InBits += 8;
}
code = (int)state.InBuffer & ((1 << state.BitsPerSample) - 1);
state.InBuffer >>= state.BitsPerSample;
state.InBits -= state.BitsPerSample;
}
else
{
code = inputG722Data[j++];
}
switch (state.BitsPerSample)
{
default:
case 8:
wd1 = code & 0x3F;
ihigh = (code >> 6) & 0x03;
wd2 = qm6[wd1];
wd1 >>= 2;
break;
case 7:
wd1 = code & 0x1F;
ihigh = (code >> 5) & 0x03;
wd2 = qm5[wd1];
wd1 >>= 1;
break;
case 6:
wd1 = code & 0x0F;
ihigh = (code >> 4) & 0x03;
wd2 = qm4[wd1];
break;
}
// Block 5L, LOW BAND INVQBL
wd2 = (state.Band[0].det * wd2) >> 15;
// Block 5L, RECONS
rlow = state.Band[0].s + wd2;
// Block 6L, LIMIT
if (rlow > 16383)
{
rlow = 16383;
}
else if (rlow < -16384)
{
rlow = -16384;
}
// Block 2L, INVQAL
wd2 = qm4[wd1];
dlowt = (state.Band[0].det * wd2) >> 15;
// Block 3L, LOGSCL
wd2 = rl42[wd1];
wd1 = (state.Band[0].nb * 127) >> 7;
wd1 += wl[wd2];
if (wd1 < 0)
{
wd1 = 0;
}
else if (wd1 > 18432)
{
wd1 = 18432;
}
state.Band[0].nb = wd1;
// Block 3L, SCALEL
wd1 = (state.Band[0].nb >> 6) & 31;
wd2 = 8 - (state.Band[0].nb >> 11);
wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2);
state.Band[0].det = wd3 << 2;
Block4(state, 0, dlowt);
if (!state.EncodeFrom8000Hz)
{
// Block 2H, INVQAH
wd2 = qm2[ihigh];
dhigh = (state.Band[1].det * wd2) >> 15;
// Block 5H, RECONS
rhigh = dhigh + state.Band[1].s;
// Block 6H, LIMIT
if (rhigh > 16383)
{
rhigh = 16383;
}
else if (rhigh < -16384)
{
rhigh = -16384;
}
// Block 2H, INVQAH
wd2 = rh2[ihigh];
wd1 = (state.Band[1].nb * 127) >> 7;
wd1 += wh[wd2];
if (wd1 < 0)
{
wd1 = 0;
}
else if (wd1 > 22528)
{
wd1 = 22528;
}
state.Band[1].nb = wd1;
// Block 3H, SCALEH
wd1 = (state.Band[1].nb >> 6) & 31;
wd2 = 10 - (state.Band[1].nb >> 11);
wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2);
state.Band[1].det = wd3 << 2;
Block4(state, 1, dhigh);
}
if (state.ItuTestMode)
{
outputBuffer[outlen++] = (short)(rlow << 1);
outputBuffer[outlen++] = (short)(rhigh << 1);
}
else
{
if (state.EncodeFrom8000Hz)
{
outputBuffer[outlen++] = (short)(rlow << 1);
}
else
{
// Apply the receive QMF
for (i = 0; i < 22; i++)
{
state.QmfSignalHistory[i] = state.QmfSignalHistory[i + 2];
}
state.QmfSignalHistory[22] = rlow + rhigh;
state.QmfSignalHistory[23] = rlow - rhigh;
xout1 = 0;
xout2 = 0;
for (i = 0; i < 12; i++)
{
xout2 += state.QmfSignalHistory[2 * i] * qmf_coeffs[i];
xout1 += state.QmfSignalHistory[2 * i + 1] * qmf_coeffs[11 - i];
}
outputBuffer[outlen++] = (short)(xout1 >> 11);
outputBuffer[outlen++] = (short)(xout2 >> 11);
}
}
}
return(outlen);
}
private static byte[] EncodeG722(byte[] pcmMonoData, int sampleRate)
{
var codec = new G722Codec();
var state = new G722CodecState(sampleRate, G722Flags.SampleRate8000);
var wb = new WaveBuffer(pcmMonoData);
var encodedLength = pcmMonoData.Length / 2;
var outputBuffer = new byte[encodedLength];
var length = codec.Encode(state, outputBuffer, wb.ShortBuffer, pcmMonoData.Length / 2);
if (length != outputBuffer.Length)
{
var outputBuffer2 = new byte[length];
Buffer.BlockCopy(outputBuffer, 0, outputBuffer2, 0, length);
outputBuffer = outputBuffer2;
}
return outputBuffer;
}
private static byte[] DecodeG722(byte[] g722Data, int sampleRate)
{
var codec = new G722Codec();
var state = new G722CodecState(sampleRate, G722Flags.SampleRate8000);
var decodedLength = g722Data.Length * 2;
var outputBuffer = new byte[decodedLength];
var wb = new WaveBuffer(outputBuffer);
var length = codec.Decode(state, wb.ShortBuffer, g722Data, g722Data.Length) * 2;
if (length != outputBuffer.Length)
{
var outputBuffer2 = new byte[length];
Buffer.BlockCopy(outputBuffer, 0, outputBuffer2, 0, length);
outputBuffer = outputBuffer2;
}
return outputBuffer;
}
static void Block4(G722CodecState s, int band, int d)
{
int wd1;
int wd2;
int wd3;
int i;
// Block 4, RECONS
s.Band[band].d[0] = d;
s.Band[band].r[0] = Saturate(s.Band[band].s + d);
// Block 4, PARREC
s.Band[band].p[0] = Saturate(s.Band[band].sz + d);
// Block 4, UPPOL2
for (i = 0; i < 3; i++)
s.Band[band].sg[i] = s.Band[band].p[i] >> 15;
wd1 = Saturate(s.Band[band].a[1] << 2);
wd2 = (s.Band[band].sg[0] == s.Band[band].sg[1]) ? -wd1 : wd1;
if (wd2 > 32767)
wd2 = 32767;
wd3 = (s.Band[band].sg[0] == s.Band[band].sg[2]) ? 128 : -128;
wd3 += (wd2 >> 7);
wd3 += (s.Band[band].a[2] * 32512) >> 15;
if (wd3 > 12288)
wd3 = 12288;
else if (wd3 < -12288)
wd3 = -12288;
s.Band[band].ap[2] = wd3;
// Block 4, UPPOL1
s.Band[band].sg[0] = s.Band[band].p[0] >> 15;
s.Band[band].sg[1] = s.Band[band].p[1] >> 15;
wd1 = (s.Band[band].sg[0] == s.Band[band].sg[1]) ? 192 : -192;
wd2 = (s.Band[band].a[1] * 32640) >> 15;
s.Band[band].ap[1] = Saturate(wd1 + wd2);
wd3 = Saturate(15360 - s.Band[band].ap[2]);
if (s.Band[band].ap[1] > wd3)
s.Band[band].ap[1] = wd3;
else if (s.Band[band].ap[1] < -wd3)
s.Band[band].ap[1] = -wd3;
// Block 4, UPZERO
wd1 = (d == 0) ? 0 : 128;
s.Band[band].sg[0] = d >> 15;
for (i = 1; i < 7; i++)
{
s.Band[band].sg[i] = s.Band[band].d[i] >> 15;
wd2 = (s.Band[band].sg[i] == s.Band[band].sg[0]) ? wd1 : -wd1;
wd3 = (s.Band[band].b[i] * 32640) >> 15;
s.Band[band].bp[i] = Saturate(wd2 + wd3);
}
// Block 4, DELAYA
for (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 (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];
}
// Block 4, FILTEP
wd1 = Saturate(s.Band[band].r[1] + s.Band[band].r[1]);
wd1 = (s.Band[band].a[1] * wd1) >> 15;
wd2 = Saturate(s.Band[band].r[2] + s.Band[band].r[2]);
wd2 = (s.Band[band].a[2] * wd2) >> 15;
s.Band[band].sp = Saturate(wd1 + wd2);
// Block 4, FILTEZ
s.Band[band].sz = 0;
for (i = 6; i > 0; i--)
{
wd1 = Saturate(s.Band[band].d[i] + s.Band[band].d[i]);
s.Band[band].sz += (s.Band[band].b[i] * wd1) >> 15;
}
s.Band[band].sz = Saturate(s.Band[band].sz);
// Block 4, PREDIC
s.Band[band].s = Saturate(s.Band[band].sp + s.Band[band].sz);
}
/// <summary>
/// Encodes a buffer of G722
/// </summary>
/// <param name="state">Codec state</param>
/// <param name="outputBuffer">Output buffer (to contain encoded G722)</param>
/// <param name="inputBuffer">PCM 16 bit samples to encode</param>
/// <param name="inputBufferCount">Number of samples in the input buffer to encode</param>
/// <returns>Number of encoded bytes written into output buffer</returns>
public int Encode(G722CodecState state, byte[] outputBuffer, short[] inputBuffer, int inputBufferCount)
{
int dlow;
int dhigh;
int el;
int wd;
int wd1;
int ril;
int wd2;
int il4;
int ih2;
int wd3;
int eh;
int mih;
int i;
int j;
// Low and high band PCM from the QMF
int xlow;
int xhigh;
int g722_bytes;
// Even and odd tap accumulators
int sumeven;
int sumodd;
int ihigh;
int ilow;
int code;
g722_bytes = 0;
xhigh = 0;
for (j = 0; j < inputBufferCount; )
{
if (state.ItuTestMode)
{
xlow =
xhigh = inputBuffer[j++] >> 1;
}
else
{
if (state.EncodeFrom8000Hz)
{
xlow = inputBuffer[j++] >> 1;
}
else
{
// Apply the transmit QMF
// Shuffle the buffer down
for (i = 0; i < 22; i++)
state.QmfSignalHistory[i] = state.QmfSignalHistory[i + 2];
state.QmfSignalHistory[22] = inputBuffer[j++];
state.QmfSignalHistory[23] = inputBuffer[j++];
// Discard every other QMF output
sumeven = 0;
sumodd = 0;
for (i = 0; i < 12; i++)
{
sumodd += state.QmfSignalHistory[2 * i] * qmf_coeffs[i];
sumeven += state.QmfSignalHistory[2 * i + 1] * qmf_coeffs[11 - i];
}
xlow = (sumeven + sumodd) >> 14;
xhigh = (sumeven - sumodd) >> 14;
}
}
// Block 1L, SUBTRA
el = Saturate(xlow - state.Band[0].s);
// Block 1L, QUANTL
wd = (el >= 0) ? el : -(el + 1);
for (i = 1; i < 30; i++)
{
wd1 = (q6[i] * state.Band[0].det) >> 12;
if (wd < wd1)
break;
}
ilow = (el < 0) ? iln[i] : ilp[i];
// Block 2L, INVQAL
ril = ilow >> 2;
wd2 = qm4[ril];
dlow = (state.Band[0].det * wd2) >> 15;
// Block 3L, LOGSCL
il4 = rl42[ril];
wd = (state.Band[0].nb * 127) >> 7;
state.Band[0].nb = wd + wl[il4];
if (state.Band[0].nb < 0)
state.Band[0].nb = 0;
else if (state.Band[0].nb > 18432)
state.Band[0].nb = 18432;
// Block 3L, SCALEL
wd1 = (state.Band[0].nb >> 6) & 31;
wd2 = 8 - (state.Band[0].nb >> 11);
wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2);
state.Band[0].det = wd3 << 2;
Block4(state, 0, dlow);
if (state.EncodeFrom8000Hz)
{
// Just leave the high bits as zero
code = (0xC0 | ilow) >> (8 - state.BitsPerSample);
}
else
{
// Block 1H, SUBTRA
eh = Saturate(xhigh - state.Band[1].s);
// Block 1H, QUANTH
wd = (eh >= 0) ? eh : -(eh + 1);
wd1 = (564 * state.Band[1].det) >> 12;
mih = (wd >= wd1) ? 2 : 1;
ihigh = (eh < 0) ? ihn[mih] : ihp[mih];
// Block 2H, INVQAH
wd2 = qm2[ihigh];
dhigh = (state.Band[1].det * wd2) >> 15;
// Block 3H, LOGSCH
ih2 = rh2[ihigh];
wd = (state.Band[1].nb * 127) >> 7;
state.Band[1].nb = wd + wh[ih2];
if (state.Band[1].nb < 0)
state.Band[1].nb = 0;
else if (state.Band[1].nb > 22528)
state.Band[1].nb = 22528;
// Block 3H, SCALEH
wd1 = (state.Band[1].nb >> 6) & 31;
wd2 = 10 - (state.Band[1].nb >> 11);
wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2);
state.Band[1].det = wd3 << 2;
Block4(state, 1, dhigh);
code = ((ihigh << 6) | ilow) >> (8 - state.BitsPerSample);
}
if (state.Packed)
{
// Pack the code bits
state.OutBuffer |= (uint)(code << state.OutBits);
state.OutBits += state.BitsPerSample;
if (state.OutBits >= 8)
{
outputBuffer[g722_bytes++] = (byte)(state.OutBuffer & 0xFF);
state.OutBits -= 8;
state.OutBuffer >>= 8;
}
}
else
{
outputBuffer[g722_bytes++] = (byte)code;
}
}
return g722_bytes;
}
/// <summary>
/// Decodes a buffer of G722
/// </summary>
/// <param name="state">Codec state</param>
/// <param name="outputBuffer">Output buffer (to contain decompressed PCM samples)</param>
/// <param name="inputG722Data"></param>
/// <param name="inputLength">Number of bytes in input G722 data to decode</param>
/// <returns>Number of samples written into output buffer</returns>
public int Decode(G722CodecState state, short[] outputBuffer, byte[] inputG722Data, int inputLength)
{
int dlowt;
int rlow;
int ihigh;
int dhigh;
int rhigh;
int xout1;
int xout2;
int wd1;
int wd2;
int wd3;
int code;
int outlen;
int i;
int j;
outlen = 0;
rhigh = 0;
for (j = 0; j < inputLength; )
{
if (state.Packed)
{
// Unpack the code bits
if (state.InBits < state.BitsPerSample)
{
state.InBuffer |= (uint)(inputG722Data[j++] << state.InBits);
state.InBits += 8;
}
code = (int)state.InBuffer & ((1 << state.BitsPerSample) - 1);
state.InBuffer >>= state.BitsPerSample;
state.InBits -= state.BitsPerSample;
}
else
{
code = inputG722Data[j++];
}
switch (state.BitsPerSample)
{
default:
case 8:
wd1 = code & 0x3F;
ihigh = (code >> 6) & 0x03;
wd2 = qm6[wd1];
wd1 >>= 2;
break;
case 7:
wd1 = code & 0x1F;
ihigh = (code >> 5) & 0x03;
wd2 = qm5[wd1];
wd1 >>= 1;
break;
case 6:
wd1 = code & 0x0F;
ihigh = (code >> 4) & 0x03;
wd2 = qm4[wd1];
break;
}
// Block 5L, LOW BAND INVQBL
wd2 = (state.Band[0].det * wd2) >> 15;
// Block 5L, RECONS
rlow = state.Band[0].s + wd2;
// Block 6L, LIMIT
if (rlow > 16383)
rlow = 16383;
else if (rlow < -16384)
rlow = -16384;
// Block 2L, INVQAL
wd2 = qm4[wd1];
dlowt = (state.Band[0].det * wd2) >> 15;
// Block 3L, LOGSCL
wd2 = rl42[wd1];
wd1 = (state.Band[0].nb * 127) >> 7;
wd1 += wl[wd2];
if (wd1 < 0)
wd1 = 0;
else if (wd1 > 18432)
wd1 = 18432;
state.Band[0].nb = wd1;
// Block 3L, SCALEL
wd1 = (state.Band[0].nb >> 6) & 31;
wd2 = 8 - (state.Band[0].nb >> 11);
wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2);
state.Band[0].det = wd3 << 2;
Block4(state, 0, dlowt);
if (!state.EncodeFrom8000Hz)
{
// Block 2H, INVQAH
wd2 = qm2[ihigh];
dhigh = (state.Band[1].det * wd2) >> 15;
// Block 5H, RECONS
rhigh = dhigh + state.Band[1].s;
// Block 6H, LIMIT
if (rhigh > 16383)
rhigh = 16383;
else if (rhigh < -16384)
rhigh = -16384;
// Block 2H, INVQAH
wd2 = rh2[ihigh];
wd1 = (state.Band[1].nb * 127) >> 7;
wd1 += wh[wd2];
if (wd1 < 0)
wd1 = 0;
else if (wd1 > 22528)
wd1 = 22528;
state.Band[1].nb = wd1;
// Block 3H, SCALEH
wd1 = (state.Band[1].nb >> 6) & 31;
wd2 = 10 - (state.Band[1].nb >> 11);
wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2);
state.Band[1].det = wd3 << 2;
Block4(state, 1, dhigh);
}
if (state.ItuTestMode)
{
outputBuffer[outlen++] = (short)(rlow << 1);
outputBuffer[outlen++] = (short)(rhigh << 1);
}
else
{
if (state.EncodeFrom8000Hz)
{
outputBuffer[outlen++] = (short)(rlow << 1);
}
else
{
// Apply the receive QMF
for (i = 0; i < 22; i++)
state.QmfSignalHistory[i] = state.QmfSignalHistory[i + 2];
state.QmfSignalHistory[22] = rlow + rhigh;
state.QmfSignalHistory[23] = rlow - rhigh;
xout1 = 0;
xout2 = 0;
for (i = 0; i < 12; i++)
{
xout2 += state.QmfSignalHistory[2 * i] * qmf_coeffs[i];
xout1 += state.QmfSignalHistory[2 * i + 1] * qmf_coeffs[11 - i];
}
outputBuffer[outlen++] = (short)(xout1 >> 11);
outputBuffer[outlen++] = (short)(xout2 >> 11);
}
}
}
return outlen;
}
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);
}
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);
}
