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); }