/// <summary>
/// Transforms a stereo frame into a mono frame and stores intensity stereo
/// </summary>
/// <param name="bits"></param>
/// <param name="data"></param>
/// <param name="frameSize"></param>
public static void encode(Bits bits, float[] data, int frameSize)
{
int i, tmp;
float e_left = 0, e_right = 0, e_tot = 0;
float balance, e_ratio;
for (i = 0; i < frameSize; i++)
{
e_left += data[2 * i] * data[2 * i];
e_right += data[2 * i + 1] * data[2 * i + 1];
data[i] = .5f * (data[2 * i] + data[2 * i + 1]);
e_tot += data[i] * data[i];
}
balance = (e_left + 1) / (e_right + 1);
e_ratio = e_tot / (1 + e_left + e_right);
/*Quantization*/
bits.Pack(14, 5);
bits.Pack(SPEEX_INBAND_STEREO, 4);
balance = (float)(4 * Math.Log(balance));
/*Pack balance*/
if (balance > 0)
{
bits.Pack(0, 1);
}
else
{
bits.Pack(1, 1);
}
balance = (float)Math.Floor(.5f + Math.Abs(balance));
if (balance > 30)
{
balance = 31;
}
bits.Pack((int)balance, 5);
/*Quantize energy ratio*/
tmp = VQ.index(e_ratio, e_ratio_quant, 4);
bits.Pack(tmp, 2);
}
public static void Encode(Bits bits, float[] data, int frameSize)
{
float num = 0f;
float num2 = 0f;
float num3 = 0f;
for (int i = 0; i < frameSize; i++)
{
num += data[2 * i] * data[2 * i];
num2 += data[2 * i + 1] * data[2 * i + 1];
data[i] = 0.5f * (data[2 * i] + data[2 * i + 1]);
num3 += data[i] * data[i];
}
float num4 = (num + 1f) / (num2 + 1f);
float ins = num3 / (1f + num + num2);
bits.Pack(14, 5);
bits.Pack(9, 4);
num4 = (float)(4.0 * Math.Log((double)num4));
if (num4 > 0f)
{
bits.Pack(0, 1);
}
else
{
bits.Pack(1, 1);
}
num4 = (float)Math.Floor((double)(0.5f + Math.Abs(num4)));
if (num4 > 30f)
{
num4 = 31f;
}
bits.Pack((int)num4, 5);
int data2 = VQ.Index(ins, Stereo.e_ratio_quant, 4);
bits.Pack(data2, 2);
}
public int Encode(Bits bits, float[] vin)
{
int i;
float[] res, target, mem;
float[] syn_resp;
float[] orig;
/* Copy new data in input buffer */
System.Array.Copy(frmBuf, frameSize, frmBuf, 0, bufSize - frameSize);
frmBuf[bufSize - frameSize] = vin[0] - preemph * pre_mem;
for (i = 1; i < frameSize; i++)
{
frmBuf[bufSize - frameSize + i] = vin[i] - preemph * vin[i - 1];
}
pre_mem = vin[frameSize - 1];
/* Move signals 1 frame towards the past */
System.Array.Copy(exc2Buf, frameSize, exc2Buf, 0, bufSize - frameSize);
System.Array.Copy(excBuf, frameSize, excBuf, 0, bufSize - frameSize);
System.Array.Copy(swBuf, frameSize, swBuf, 0, bufSize - frameSize);
/* Window for analysis */
for (i = 0; i < windowSize; i++)
{
buf2[i] = frmBuf[i + frmIdx] * window[i];
}
/* Compute auto-correlation */
Lpc.autocorr(buf2, autocorr, lpcSize + 1, windowSize);
autocorr[0] += 10; /* prevents NANs */
autocorr[0] *= lpc_floor; /* Noise floor in auto-correlation domain */
/* Lag windowing: equivalent to filtering in the power-spectrum domain */
for (i = 0; i < lpcSize + 1; i++)
{
autocorr[i] *= lagWindow[i];
}
/* Levinson-Durbin */
Lpc.wld(lpc, autocorr, rc, lpcSize); // tmperr
System.Array.Copy(lpc, 0, lpc, 1, lpcSize);
lpc[0] = 1;
/* LPC to LSPs (x-domain) transform */
int roots = Lsp.lpc2lsp(lpc, lpcSize, lsp, 15, 0.2f);
/* Check if we found all the roots */
if (roots == lpcSize)
{
/* LSP x-domain to angle domain*/
for (i = 0; i < lpcSize; i++)
{
lsp[i] = (float)Math.Acos(lsp[i]);
}
}
else
{
/* Search again if we can afford it */
if (complexity > 1)
{
roots = Lsp.lpc2lsp(lpc, lpcSize, lsp, 11, 0.05f);
}
if (roots == lpcSize)
{
/* LSP x-domain to angle domain*/
for (i = 0; i < lpcSize; i++)
{
lsp[i] = (float)Math.Acos(lsp[i]);
}
}
else
{
/*If we can't find all LSP's, do some damage control and use previous filter*/
for (i = 0; i < lpcSize; i++)
{
lsp[i] = old_lsp[i];
}
}
}
float lsp_dist = 0;
for (i = 0; i < lpcSize; i++)
{
lsp_dist += (old_lsp[i] - lsp[i]) * (old_lsp[i] - lsp[i]);
}
/* Whole frame analysis (open-loop estimation of pitch and excitation gain) */
float ol_gain;
int ol_pitch;
float ol_pitch_coef;
{
if (first != 0)
{
for (i = 0; i < lpcSize; i++)
{
interp_lsp[i] = lsp[i];
}
}
else
{
for (i = 0; i < lpcSize; i++)
{
interp_lsp[i] = .375f * old_lsp[i] + .625f * lsp[i];
}
}
Lsp.enforce_margin(interp_lsp, lpcSize, .002f);
/* Compute interpolated LPCs (unquantized) for whole frame*/
for (i = 0; i < lpcSize; i++)
{
interp_lsp[i] = (float)Math.Cos(interp_lsp[i]);
}
m_lsp.lsp2lpc(interp_lsp, interp_lpc, lpcSize);
/*Open-loop pitch*/
if (submodes[submodeID] == null ||
vbr_enabled != 0 || vad_enabled != 0 ||
submodes[submodeID].forced_pitch_gain != 0 ||
submodes[submodeID].lbr_pitch != -1)
{
int[] nol_pitch = new int[6];
float[] nol_pitch_coef = new float[6];
Filters.bw_lpc(gamma1, interp_lpc, bw_lpc1, lpcSize);
Filters.bw_lpc(gamma2, interp_lpc, bw_lpc2, lpcSize);
Filters.filter_mem2(frmBuf, frmIdx, bw_lpc1, bw_lpc2, swBuf, swIdx,
frameSize, lpcSize, mem_sw_whole, 0);
Ltp.open_loop_nbest_pitch(swBuf, swIdx, min_pitch, max_pitch, frameSize,
nol_pitch, nol_pitch_coef, 6);
ol_pitch = nol_pitch[0];
ol_pitch_coef = nol_pitch_coef[0];
/*Try to remove pitch multiples*/
for (i = 1; i < 6; i++)
{
if ((nol_pitch_coef[i] > .85 * ol_pitch_coef) &&
(Math.Abs(nol_pitch[i] - ol_pitch / 2.0) <= 1 ||
Math.Abs(nol_pitch[i] - ol_pitch / 3.0) <= 1 ||
Math.Abs(nol_pitch[i] - ol_pitch / 4.0) <= 1 ||
Math.Abs(nol_pitch[i] - ol_pitch / 5.0) <= 1))
{
/*ol_pitch_coef=nol_pitch_coef[i];*/
ol_pitch = nol_pitch[i];
}
}
/*if (ol_pitch>50)
* ol_pitch/=2;*/
/*ol_pitch_coef = sqrt(ol_pitch_coef);*/
}
else
{
ol_pitch = 0;
ol_pitch_coef = 0;
}
/*Compute "real" excitation*/
Filters.fir_mem2(frmBuf, frmIdx, interp_lpc, excBuf, excIdx, frameSize, lpcSize, mem_exc);
/* Compute open-loop excitation gain */
ol_gain = 0;
for (i = 0; i < frameSize; i++)
{
ol_gain += excBuf[excIdx + i] * excBuf[excIdx + i];
}
ol_gain = (float)Math.Sqrt(1 + ol_gain / frameSize);
}
/*VBR stuff*/
if (vbr != null && (vbr_enabled != 0 || vad_enabled != 0))
{
if (abr_enabled != 0)
{
float qual_change = 0;
if (abr_drift2 * abr_drift > 0)
{
/* Only adapt if long-term and short-term drift are the same sign */
qual_change = -.00001f * abr_drift / (1 + abr_count);
if (qual_change > .05f)
{
qual_change = .05f;
}
if (qual_change < -.05f)
{
qual_change = -.05f;
}
}
vbr_quality += qual_change;
if (vbr_quality > 10)
{
vbr_quality = 10;
}
if (vbr_quality < 0)
{
vbr_quality = 0;
}
}
relative_quality = vbr.analysis(vin, frameSize, ol_pitch, ol_pitch_coef);
/*if (delta_qual<0)*/
/* delta_qual*=.1*(3+st->vbr_quality);*/
if (vbr_enabled != 0)
{
int mode;
int choice = 0;
float min_diff = 100;
mode = 8;
while (mode > 0)
{
int v1;
float thresh;
v1 = (int)Math.Floor(vbr_quality);
if (v1 == 10)
{
thresh = NSpeex.Vbr.nb_thresh[mode][v1];
}
else
{
thresh = (vbr_quality - v1) * NSpeex.Vbr.nb_thresh[mode][v1 + 1] +
(1 + v1 - vbr_quality) * NSpeex.Vbr.nb_thresh[mode][v1];
}
if (relative_quality > thresh &&
relative_quality - thresh < min_diff)
{
choice = mode;
min_diff = relative_quality - thresh;
}
mode--;
}
mode = choice;
if (mode == 0)
{
if (dtx_count == 0 || lsp_dist > .05 || dtx_enabled == 0 || dtx_count > 20)
{
mode = 1;
dtx_count = 1;
}
else
{
mode = 0;
dtx_count++;
}
}
else
{
dtx_count = 0;
}
Mode = mode;
if (abr_enabled != 0)
{
int bitrate;
bitrate = BitRate;
abr_drift += (bitrate - abr_enabled);
abr_drift2 = .95f * abr_drift2 + .05f * (bitrate - abr_enabled);
abr_count += 1.0f;
}
}
else
{
/*VAD only case*/
int mode;
if (relative_quality < 2)
{
if (dtx_count == 0 || lsp_dist > .05 || dtx_enabled == 0 || dtx_count > 20)
{
dtx_count = 1;
mode = 1;
}
else
{
mode = 0;
dtx_count++;
}
}
else
{
dtx_count = 0;
mode = submodeSelect;
}
/*speex_encoder_ctl(state, SPEEX_SET_MODE, &mode);*/
submodeID = mode;
}
}
else
{
relative_quality = -1;
}
/* First, transmit a zero for narrowband */
bits.Pack(0, 1);
/* Transmit the sub-mode we use for this frame */
bits.Pack(submodeID, NB_SUBMODE_BITS);
/* If null mode (no transmission), just set a couple things to zero*/
if (submodes[submodeID] == null)
{
for (i = 0; i < frameSize; i++)
{
excBuf[excIdx + i] = exc2Buf[exc2Idx + i] = swBuf[swIdx + i] = VERY_SMALL;
}
for (i = 0; i < lpcSize; i++)
{
mem_sw[i] = 0;
}
first = 1;
bounded_pitch = 1;
/* Final signal synthesis from excitation */
Filters.iir_mem2(excBuf, excIdx, interp_qlpc, frmBuf, frmIdx, frameSize, lpcSize, mem_sp);
vin[0] = frmBuf[frmIdx] + preemph * pre_mem2;
for (i = 1; i < frameSize; i++)
{
vin[i] = frmBuf[frmIdx = i] + preemph * vin[i - 1];
}
pre_mem2 = vin[frameSize - 1];
return(0);
}
/* LSP Quantization */
if (first != 0)
{
for (i = 0; i < lpcSize; i++)
{
old_lsp[i] = lsp[i];
}
}
/*Quantize LSPs*/
//#if 1 /*0 for unquantized*/
submodes[submodeID].lsqQuant.quant(lsp, qlsp, lpcSize, bits);
//#else
// for (i=0;i<lpcSize;i++)
// qlsp[i]=lsp[i];
//#endif
/*If we use low bit-rate pitch mode, transmit open-loop pitch*/
if (submodes[submodeID].lbr_pitch != -1)
{
bits.Pack(ol_pitch - min_pitch, 7);
}
if (submodes[submodeID].forced_pitch_gain != 0)
{
int quant;
quant = (int)Math.Floor(.5 + 15 * ol_pitch_coef);
if (quant > 15)
{
quant = 15;
}
if (quant < 0)
{
quant = 0;
}
bits.Pack(quant, 4);
ol_pitch_coef = (float)0.066667 * quant;
}
/*Quantize and transmit open-loop excitation gain*/
{
int qe = (int)(Math.Floor(0.5 + 3.5 * Math.Log(ol_gain)));
if (qe < 0)
{
qe = 0;
}
if (qe > 31)
{
qe = 31;
}
ol_gain = (float)Math.Exp(qe / 3.5);
bits.Pack(qe, 5);
}
/* Special case for first frame */
if (first != 0)
{
for (i = 0; i < lpcSize; i++)
{
old_qlsp[i] = qlsp[i];
}
}
/* Filter response */
res = new float[subframeSize];
/* Target signal */
target = new float[subframeSize];
syn_resp = new float[subframeSize];
mem = new float[lpcSize];
orig = new float[frameSize];
for (i = 0; i < frameSize; i++)
{
orig[i] = frmBuf[frmIdx + i];
}
/* Loop on sub-frames */
for (int sub = 0; sub < nbSubframes; sub++)
{
float tmp;
int offset;
int sp, sw, exc, exc2;
int pitchval;
/* Offset relative to start of frame */
offset = subframeSize * sub;
/* Original signal */
sp = frmIdx + offset;
/* Excitation */
exc = excIdx + offset;
/* Weighted signal */
sw = swIdx + offset;
exc2 = exc2Idx + offset;
/* LSP interpolation (quantized and unquantized) */
tmp = (float)(1.0 + sub) / nbSubframes;
for (i = 0; i < lpcSize; i++)
{
interp_lsp[i] = (1 - tmp) * old_lsp[i] + tmp * lsp[i];
}
for (i = 0; i < lpcSize; i++)
{
interp_qlsp[i] = (1 - tmp) * old_qlsp[i] + tmp * qlsp[i];
}
/* Make sure the filters are stable */
Lsp.enforce_margin(interp_lsp, lpcSize, .002f);
Lsp.enforce_margin(interp_qlsp, lpcSize, .002f);
/* Compute interpolated LPCs (quantized and unquantized) */
for (i = 0; i < lpcSize; i++)
{
interp_lsp[i] = (float)Math.Cos(interp_lsp[i]);
}
m_lsp.lsp2lpc(interp_lsp, interp_lpc, lpcSize);
for (i = 0; i < lpcSize; i++)
{
interp_qlsp[i] = (float)Math.Cos(interp_qlsp[i]);
}
m_lsp.lsp2lpc(interp_qlsp, interp_qlpc, lpcSize);
/* Compute analysis filter gain at w=pi (for use in SB-CELP) */
tmp = 1;
pi_gain[sub] = 0;
for (i = 0; i <= lpcSize; i++)
{
pi_gain[sub] += tmp * interp_qlpc[i];
tmp = -tmp;
}
/* Compute bandwidth-expanded (unquantized) LPCs for perceptual weighting */
Filters.bw_lpc(gamma1, interp_lpc, bw_lpc1, lpcSize);
if (gamma2 >= 0)
{
Filters.bw_lpc(gamma2, interp_lpc, bw_lpc2, lpcSize);
}
else
{
bw_lpc2[0] = 1;
bw_lpc2[1] = -preemph;
for (i = 2; i <= lpcSize; i++)
{
bw_lpc2[i] = 0;
}
}
/* Compute impulse response of A(z/g1) / ( A(z)*A(z/g2) )*/
for (i = 0; i < subframeSize; i++)
{
excBuf[exc + i] = 0;
}
excBuf[exc] = 1;
Filters.syn_percep_zero(excBuf, exc, interp_qlpc, bw_lpc1, bw_lpc2, syn_resp, subframeSize, lpcSize);
/* Reset excitation */
for (i = 0; i < subframeSize; i++)
{
excBuf[exc + i] = 0;
}
for (i = 0; i < subframeSize; i++)
{
exc2Buf[exc2 + i] = 0;
}
/* Compute zero response of A(z/g1) / ( A(z/g2) * A(z) ) */
for (i = 0; i < lpcSize; i++)
{
mem[i] = mem_sp[i];
}
Filters.iir_mem2(excBuf, exc, interp_qlpc, excBuf, exc, subframeSize, lpcSize, mem);
for (i = 0; i < lpcSize; i++)
{
mem[i] = mem_sw[i];
}
Filters.filter_mem2(excBuf, exc, bw_lpc1, bw_lpc2, res, 0, subframeSize, lpcSize, mem, 0);
/* Compute weighted signal */
for (i = 0; i < lpcSize; i++)
{
mem[i] = mem_sw[i];
}
Filters.filter_mem2(frmBuf, sp, bw_lpc1, bw_lpc2, swBuf, sw, subframeSize, lpcSize, mem, 0);
/* Compute target signal */
for (i = 0; i < subframeSize; i++)
{
target[i] = swBuf[sw + i] - res[i];
}
for (i = 0; i < subframeSize; i++)
{
excBuf[exc + i] = exc2Buf[exc2 + i] = 0;
}
/* If we have a long-term predictor (otherwise, something's wrong) */
// if (submodes[submodeID].ltp.quant)
// {
int pit_min, pit_max;
/* Long-term prediction */
if (submodes[submodeID].lbr_pitch != -1)
{
/* Low bit-rate pitch handling */
int margin;
margin = submodes[submodeID].lbr_pitch;
if (margin != 0)
{
if (ol_pitch < min_pitch + margin - 1)
{
ol_pitch = min_pitch + margin - 1;
}
if (ol_pitch > max_pitch - margin)
{
ol_pitch = max_pitch - margin;
}
pit_min = ol_pitch - margin + 1;
pit_max = ol_pitch + margin;
}
else
{
pit_min = pit_max = ol_pitch;
}
}
else
{
pit_min = min_pitch;
pit_max = max_pitch;
}
/* Force pitch to use only the current frame if needed */
if (bounded_pitch != 0 && pit_max > offset)
{
pit_max = offset;
}
/* Perform pitch search */
pitchval = submodes[submodeID].ltp.Quant(target, swBuf, sw, interp_qlpc, bw_lpc1, bw_lpc2,
excBuf, exc, pit_min, pit_max, ol_pitch_coef, lpcSize,
subframeSize, bits, exc2Buf, exc2, syn_resp, complexity);
pitch[sub] = pitchval;
// } else {
// speex_error ("No pitch prediction, what's wrong");
// }
/* Update target for adaptive codebook contribution */
Filters.syn_percep_zero(excBuf, exc, interp_qlpc, bw_lpc1, bw_lpc2, res, subframeSize, lpcSize);
for (i = 0; i < subframeSize; i++)
{
target[i] -= res[i];
}
/* Quantization of innovation */
{
int innovptr;
float ener = 0, ener_1;
innovptr = sub * subframeSize;
for (i = 0; i < subframeSize; i++)
{
innov[innovptr + i] = 0;
}
Filters.residue_percep_zero(target, 0, interp_qlpc, bw_lpc1, bw_lpc2, buf2, subframeSize, lpcSize);
for (i = 0; i < subframeSize; i++)
{
ener += buf2[i] * buf2[i];
}
ener = (float)Math.Sqrt(.1f + ener / subframeSize);
/*for (i=0;i<subframeSize;i++)
* System.out.print(buf2[i]/ener + "\t");
*/
ener /= ol_gain;
/* Calculate gain correction for the sub-frame (if any) */
if (submodes[submodeID].have_subframe_gain != 0)
{
int qe;
ener = (float)Math.Log(ener);
if (submodes[submodeID].have_subframe_gain == 3)
{
qe = VQ.index(ener, exc_gain_quant_scal3, 8);
bits.Pack(qe, 3);
ener = exc_gain_quant_scal3[qe];
}
else
{
qe = VQ.index(ener, exc_gain_quant_scal1, 2);
bits.Pack(qe, 1);
ener = exc_gain_quant_scal1[qe];
}
ener = (float)Math.Exp(ener);
}
else
{
ener = 1;
}
ener *= ol_gain;
/*System.out.println(ener + " " + ol_gain);*/
ener_1 = 1 / ener;
/* Normalize innovation */
for (i = 0; i < subframeSize; i++)
{
target[i] *= ener_1;
}
/* Quantize innovation */
// if (submodes[submodeID].innovation != null)
// {
/* Codebook search */
submodes[submodeID].innovation.Quant(target, interp_qlpc, bw_lpc1, bw_lpc2,
lpcSize, subframeSize, innov,
innovptr, syn_resp, bits, complexity);
/* De-normalize innovation and update excitation */
for (i = 0; i < subframeSize; i++)
{
innov[innovptr + i] *= ener;
}
for (i = 0; i < subframeSize; i++)
{
excBuf[exc + i] += innov[innovptr + i];
}
// } else {
// speex_error("No fixed codebook");
// }
/* In some (rare) modes, we do a second search (more bits) to reduce noise even more */
if (submodes[submodeID].double_codebook != 0)
{
float[] innov2 = new float[subframeSize];
// for (i=0;i<subframeSize;i++)
// innov2[i]=0;
for (i = 0; i < subframeSize; i++)
{
target[i] *= 2.2f;
}
submodes[submodeID].innovation.Quant(target, interp_qlpc, bw_lpc1, bw_lpc2,
lpcSize, subframeSize, innov2, 0,
syn_resp, bits, complexity);
for (i = 0; i < subframeSize; i++)
{
innov2[i] *= ener * (1f / 2.2f);
}
for (i = 0; i < subframeSize; i++)
{
excBuf[exc + i] += innov2[i];
}
}
for (i = 0; i < subframeSize; i++)
{
target[i] *= ener;
}
}
/*Keep the previous memory*/
for (i = 0; i < lpcSize; i++)
{
mem[i] = mem_sp[i];
}
/* Final signal synthesis from excitation */
Filters.iir_mem2(excBuf, exc, interp_qlpc, frmBuf, sp, subframeSize, lpcSize, mem_sp);
/* Compute weighted signal again, from synthesized speech (not sure it's the right thing) */
Filters.filter_mem2(frmBuf, sp, bw_lpc1, bw_lpc2, swBuf, sw, subframeSize, lpcSize, mem_sw, 0);
for (i = 0; i < subframeSize; i++)
{
exc2Buf[exc2 + i] = excBuf[exc + i];
}
}
/* Store the LSPs for interpolation in the next frame */
if (submodeID >= 1)
{
for (i = 0; i < lpcSize; i++)
{
old_lsp[i] = lsp[i];
}
for (i = 0; i < lpcSize; i++)
{
old_qlsp[i] = qlsp[i];
}
}
if (submodeID == 1)
{
if (dtx_count != 0)
{
bits.Pack(15, 4);
}
else
{
bits.Pack(0, 4);
}
}
/* The next frame will not be the first (Duh!) */
first = 0;
{
float ener = 0, err = 0;
float snr;
for (i = 0; i < frameSize; i++)
{
ener += frmBuf[frmIdx + i] * frmBuf[frmIdx + i];
err += (frmBuf[frmIdx + i] - orig[i]) * (frmBuf[frmIdx + i] - orig[i]);
}
snr = (float)(10 * Math.Log((ener + 1) / (err + 1)));
/*System.out.println("Frame result: SNR="+snr+" E="+ener+" Err="+err+"\r\n");*/
}
/* Replace input by synthesized speech */
vin[0] = frmBuf[frmIdx] + preemph * pre_mem2;
for (i = 1; i < frameSize; i++)
{
vin[i] = frmBuf[frmIdx + i] + preemph * vin[i - 1];
}
pre_mem2 = vin[frameSize - 1];
if (submodes[submodeID].innovation is NoiseSearch || submodeID == 0)
{
bounded_pitch = 1;
}
else
{
bounded_pitch = 0;
}
return(1);
}
public sealed override void Quantify(float[] target, float[] ak, float[] awk1, float[] awk2, int p, int nsf, float[] exc, int es, float[] r, Bits bits, int complexity)
{
int num = complexity;
if (num > 10)
{
num = 10;
}
float[] array = new float[this.shape_cb_size * this.subvect_size];
int[] array2 = new int[num];
float[] array3 = new float[num];
float[] array4 = new float[num];
float[] array5 = new float[num];
int[] array6 = new int[num];
int[] array7 = new int[num];
for (int i = 0; i < num; i++)
{
for (int j = 0; j < this.nb_subvect; j++)
{
this.nind[i, j] = (this.oind[i, j] = -1);
}
}
for (int j = 0; j < num; j++)
{
for (int i = 0; i < nsf; i++)
{
this.ot[j][i] = target[i];
}
}
for (int i = 0; i < this.shape_cb_size; i++)
{
int num2 = i * this.subvect_size;
int num3 = i * this.subvect_size;
for (int j = 0; j < this.subvect_size; j++)
{
array[num2 + j] = 0f;
for (int k = 0; k <= j; k++)
{
array[num2 + j] += 0.03125f * (float)this.shape_cb[num3 + k] * r[j - k];
}
}
this.E[i] = 0f;
for (int j = 0; j < this.subvect_size; j++)
{
this.E[i] += array[num2 + j] * array[num2 + j];
}
}
for (int j = 0; j < num; j++)
{
array5[j] = 0f;
}
for (int i = 0; i < this.nb_subvect; i++)
{
int num4 = i * this.subvect_size;
for (int j = 0; j < num; j++)
{
array4[j] = 2.14748365E+09f;
}
for (int j = 0; j < num; j++)
{
array6[j] = (array7[j] = 0);
}
for (int j = 0; j < num; j++)
{
float num5 = 0f;
for (int l = num4; l < num4 + this.subvect_size; l++)
{
num5 += this.ot[j][l] * this.ot[j][l];
}
num5 *= 0.5f;
if (this.have_sign != 0)
{
VQ.Nbest_sign(this.ot[j], num4, array, this.subvect_size, this.shape_cb_size, this.E, num, array2, array3);
}
else
{
VQ.Nbest(this.ot[j], num4, array, this.subvect_size, this.shape_cb_size, this.E, num, array2, array3);
}
for (int k = 0; k < num; k++)
{
float num6 = array5[j] + array3[k] + num5;
if (num6 < array4[num - 1])
{
for (int l = 0; l < num; l++)
{
if (num6 < array4[l])
{
int m;
for (m = num - 1; m > l; m--)
{
array4[m] = array4[m - 1];
array6[m] = array6[m - 1];
array7[m] = array7[m - 1];
}
array4[l] = num6;
array6[m] = array2[k];
array7[m] = j;
break;
}
}
}
}
if (i == 0)
{
break;
}
}
for (int j = 0; j < num; j++)
{
for (int l = (i + 1) * this.subvect_size; l < nsf; l++)
{
this.nt[j][l] = this.ot[array7[j]][l];
}
for (int l = 0; l < this.subvect_size; l++)
{
float num7 = 1f;
int num8 = array6[j];
if (num8 >= this.shape_cb_size)
{
num7 = -1f;
num8 -= this.shape_cb_size;
}
int n = this.subvect_size - l;
float num9 = num7 * 0.03125f * (float)this.shape_cb[num8 * this.subvect_size + l];
int m = 0;
int num10 = num4 + this.subvect_size;
while (m < nsf - this.subvect_size * (i + 1))
{
this.nt[j][num10] -= num9 * r[m + n];
m++;
num10++;
}
}
for (int n = 0; n < this.nb_subvect; n++)
{
this.nind[j, n] = this.oind[array7[j], n];
}
this.nind[j, i] = array6[j];
}
float[][] array8 = this.ot;
this.ot = this.nt;
this.nt = array8;
for (int j = 0; j < num; j++)
{
for (int l = 0; l < this.nb_subvect; l++)
{
this.oind[j, l] = this.nind[j, l];
}
}
for (int j = 0; j < num; j++)
{
array5[j] = array4[j];
}
}
for (int i = 0; i < this.nb_subvect; i++)
{
this.ind[i] = this.nind[0, i];
bits.Pack(this.ind[i], this.shape_bits + this.have_sign);
}
for (int i = 0; i < this.nb_subvect; i++)
{
float num11 = 1f;
int num12 = this.ind[i];
if (num12 >= this.shape_cb_size)
{
num11 = -1f;
num12 -= this.shape_cb_size;
}
for (int j = 0; j < this.subvect_size; j++)
{
this.e[this.subvect_size * i + j] = num11 * 0.03125f * (float)this.shape_cb[num12 * this.subvect_size + j];
}
}
for (int j = 0; j < nsf; j++)
{
exc[es + j] += this.e[j];
}
Filters.Syn_percep_zero(this.e, 0, ak, awk1, awk2, this.r2, nsf, p);
for (int j = 0; j < nsf; j++)
{
target[j] -= this.r2[j];
}
}
public virtual int Encode(Bits bits, float[] ins0)
{
Array.Copy(this.frmBuf, this.frameSize, this.frmBuf, 0, this.bufSize - this.frameSize);
this.frmBuf[this.bufSize - this.frameSize] = ins0[0] - this.preemph * this.pre_mem;
for (int i = 1; i < this.frameSize; i++)
{
this.frmBuf[this.bufSize - this.frameSize + i] = ins0[i] - this.preemph * ins0[i - 1];
}
this.pre_mem = ins0[this.frameSize - 1];
Array.Copy(this.exc2Buf, this.frameSize, this.exc2Buf, 0, this.bufSize - this.frameSize);
Array.Copy(this.excBuf, this.frameSize, this.excBuf, 0, this.bufSize - this.frameSize);
Array.Copy(this.swBuf, this.frameSize, this.swBuf, 0, this.bufSize - this.frameSize);
for (int i = 0; i < this.windowSize; i++)
{
this.buf2[i] = this.frmBuf[i + this.frmIdx] * this.window[i];
}
Lpc.Autocorr(this.buf2, this.autocorr, this.lpcSize + 1, this.windowSize);
this.autocorr[0] += 10f;
this.autocorr[0] *= this.lpc_floor;
for (int i = 0; i < this.lpcSize + 1; i++)
{
this.autocorr[i] *= this.lagWindow[i];
}
Lpc.Wld(this.lpc, this.autocorr, this.rc, this.lpcSize);
Array.Copy(this.lpc, 0, this.lpc, 1, this.lpcSize);
this.lpc[0] = 1f;
int num = Lsp.Lpc2lsp(this.lpc, this.lpcSize, this.lsp, 15, 0.2f);
if (num == this.lpcSize)
{
for (int i = 0; i < this.lpcSize; i++)
{
this.lsp[i] = (float)Math.Acos((double)this.lsp[i]);
}
}
else
{
if (this.complexity > 1)
{
num = Lsp.Lpc2lsp(this.lpc, this.lpcSize, this.lsp, 11, 0.05f);
}
if (num == this.lpcSize)
{
for (int i = 0; i < this.lpcSize; i++)
{
this.lsp[i] = (float)Math.Acos((double)this.lsp[i]);
}
}
else
{
for (int i = 0; i < this.lpcSize; i++)
{
this.lsp[i] = this.old_lsp[i];
}
}
}
float num2 = 0f;
for (int i = 0; i < this.lpcSize; i++)
{
num2 += (this.old_lsp[i] - this.lsp[i]) * (this.old_lsp[i] - this.lsp[i]);
}
if (this.first != 0)
{
for (int i = 0; i < this.lpcSize; i++)
{
this.interp_lsp[i] = this.lsp[i];
}
}
else
{
for (int i = 0; i < this.lpcSize; i++)
{
this.interp_lsp[i] = 0.375f * this.old_lsp[i] + 0.625f * this.lsp[i];
}
}
Lsp.Enforce_margin(this.interp_lsp, this.lpcSize, 0.002f);
for (int i = 0; i < this.lpcSize; i++)
{
this.interp_lsp[i] = (float)Math.Cos((double)this.interp_lsp[i]);
}
this.m_lsp.Lsp2lpc(this.interp_lsp, this.interp_lpc, this.lpcSize);
int num3;
float num4;
if (this.submodes[this.submodeID] == null || this.vbr_enabled != 0 || this.vad_enabled != 0 || this.submodes[this.submodeID].ForcedPitchGain != 0 || this.submodes[this.submodeID].LbrPitch != -1)
{
int[] array = new int[6];
float[] array2 = new float[6];
Filters.Bw_lpc(this.gamma1, this.interp_lpc, this.bw_lpc1, this.lpcSize);
Filters.Bw_lpc(this.gamma2, this.interp_lpc, this.bw_lpc2, this.lpcSize);
Filters.Filter_mem2(this.frmBuf, this.frmIdx, this.bw_lpc1, this.bw_lpc2, this.swBuf, this.swIdx, this.frameSize, this.lpcSize, this.mem_sw_whole, 0);
Ltp.Open_loop_nbest_pitch(this.swBuf, this.swIdx, this.min_pitch, this.max_pitch, this.frameSize, array, array2, 6);
num3 = array[0];
num4 = array2[0];
for (int i = 1; i < 6; i++)
{
if ((double)array2[i] > 0.85 * (double)num4 && (Math.Abs((double)array[i] - (double)num3 / 2.0) <= 1.0 || Math.Abs((double)array[i] - (double)num3 / 3.0) <= 1.0 || Math.Abs((double)array[i] - (double)num3 / 4.0) <= 1.0 || Math.Abs((double)array[i] - (double)num3 / 5.0) <= 1.0))
{
num3 = array[i];
}
}
}
else
{
num3 = 0;
num4 = 0f;
}
Filters.Fir_mem2(this.frmBuf, this.frmIdx, this.interp_lpc, this.excBuf, this.excIdx, this.frameSize, this.lpcSize, this.mem_exc);
float num5 = 0f;
for (int i = 0; i < this.frameSize; i++)
{
num5 += this.excBuf[this.excIdx + i] * this.excBuf[this.excIdx + i];
}
num5 = (float)Math.Sqrt((double)(1f + num5 / (float)this.frameSize));
if (this.vbr != null && (this.vbr_enabled != 0 || this.vad_enabled != 0))
{
if (this.abr_enabled != 0)
{
float num6 = 0f;
if (this.abr_drift2 * this.abr_drift > 0f)
{
num6 = -1E-05f * this.abr_drift / (1f + this.abr_count);
if (num6 > 0.05f)
{
num6 = 0.05f;
}
if (num6 < -0.05f)
{
num6 = -0.05f;
}
}
this.vbr_quality += num6;
if (this.vbr_quality > 10f)
{
this.vbr_quality = 10f;
}
if (this.vbr_quality < 0f)
{
this.vbr_quality = 0f;
}
}
this.relative_quality = this.vbr.Analysis(ins0, this.frameSize, num3, num4);
if (this.vbr_enabled != 0)
{
int num7 = 0;
float num8 = 100f;
int j;
for (j = 8; j > 0; j--)
{
int num9 = (int)Math.Floor((double)this.vbr_quality);
float num10;
if (num9 == 10)
{
num10 = NSpeex.Vbr.nb_thresh[j][num9];
}
else
{
num10 = (this.vbr_quality - (float)num9) * NSpeex.Vbr.nb_thresh[j][num9 + 1] + ((float)(1 + num9) - this.vbr_quality) * NSpeex.Vbr.nb_thresh[j][num9];
}
if (this.relative_quality > num10 && this.relative_quality - num10 < num8)
{
num7 = j;
num8 = this.relative_quality - num10;
}
}
j = num7;
if (j == 0)
{
if (this.dtx_count == 0 || (double)num2 > 0.05 || this.dtx_enabled == 0 || this.dtx_count > 20)
{
j = 1;
this.dtx_count = 1;
}
else
{
j = 0;
this.dtx_count++;
}
}
else
{
this.dtx_count = 0;
}
this.Mode = j;
if (this.abr_enabled != 0)
{
int bitRate = this.BitRate;
this.abr_drift += (float)(bitRate - this.abr_enabled);
this.abr_drift2 = 0.95f * this.abr_drift2 + 0.05f * (float)(bitRate - this.abr_enabled);
this.abr_count += new float?((float)1.0).Value;
}
}
else
{
int submodeID;
if (this.relative_quality < 2f)
{
if (this.dtx_count == 0 || (double)num2 > 0.05 || this.dtx_enabled == 0 || this.dtx_count > 20)
{
this.dtx_count = 1;
submodeID = 1;
}
else
{
submodeID = 0;
this.dtx_count++;
}
}
else
{
this.dtx_count = 0;
submodeID = this.submodeSelect;
}
this.submodeID = submodeID;
}
}
else
{
this.relative_quality = -1f;
}
bits.Pack(0, 1);
bits.Pack(this.submodeID, 4);
if (this.submodes[this.submodeID] == null)
{
for (int i = 0; i < this.frameSize; i++)
{
this.excBuf[this.excIdx + i] = (this.exc2Buf[this.exc2Idx + i] = (this.swBuf[this.swIdx + i] = 0f));
}
for (int i = 0; i < this.lpcSize; i++)
{
this.mem_sw[i] = 0f;
}
this.first = 1;
this.bounded_pitch = 1;
Filters.Iir_mem2(this.excBuf, this.excIdx, this.interp_qlpc, this.frmBuf, this.frmIdx, this.frameSize, this.lpcSize, this.mem_sp);
ins0[0] = this.frmBuf[this.frmIdx] + this.preemph * this.pre_mem2;
for (int i = 1; i < this.frameSize; i++)
{
ins0[i] = this.frmBuf[this.frmIdx = i] + this.preemph * ins0[i - 1];
}
this.pre_mem2 = ins0[this.frameSize - 1];
return(0);
}
if (this.first != 0)
{
for (int i = 0; i < this.lpcSize; i++)
{
this.old_lsp[i] = this.lsp[i];
}
}
this.submodes[this.submodeID].LsqQuant.Quant(this.lsp, this.qlsp, this.lpcSize, bits);
if (this.submodes[this.submodeID].LbrPitch != -1)
{
bits.Pack(num3 - this.min_pitch, 7);
}
if (this.submodes[this.submodeID].ForcedPitchGain != 0)
{
int num11 = (int)Math.Floor(0.5 + (double)(15f * num4));
if (num11 > 15)
{
num11 = 15;
}
if (num11 < 0)
{
num11 = 0;
}
bits.Pack(num11, 4);
num4 = 0.066667f * (float)num11;
}
int num12 = (int)Math.Floor(0.5 + 3.5 * Math.Log((double)num5));
if (num12 < 0)
{
num12 = 0;
}
if (num12 > 31)
{
num12 = 31;
}
num5 = (float)Math.Exp((double)num12 / 3.5);
bits.Pack(num12, 5);
if (this.first != 0)
{
for (int i = 0; i < this.lpcSize; i++)
{
this.old_qlsp[i] = this.qlsp[i];
}
}
float[] array3 = new float[this.subframeSize];
float[] array4 = new float[this.subframeSize];
float[] array5 = new float[this.subframeSize];
float[] array6 = new float[this.lpcSize];
float[] array7 = new float[this.frameSize];
for (int i = 0; i < this.frameSize; i++)
{
array7[i] = this.frmBuf[this.frmIdx + i];
}
for (int k = 0; k < this.nbSubframes; k++)
{
int num13 = this.subframeSize * k;
int num14 = this.frmIdx + num13;
int num15 = this.excIdx + num13;
int num16 = this.swIdx + num13;
int num17 = this.exc2Idx + num13;
float num18 = (float)(1.0 + (double)k) / (float)this.nbSubframes;
for (int i = 0; i < this.lpcSize; i++)
{
this.interp_lsp[i] = (1f - num18) * this.old_lsp[i] + num18 * this.lsp[i];
}
for (int i = 0; i < this.lpcSize; i++)
{
this.interp_qlsp[i] = (1f - num18) * this.old_qlsp[i] + num18 * this.qlsp[i];
}
Lsp.Enforce_margin(this.interp_lsp, this.lpcSize, 0.002f);
Lsp.Enforce_margin(this.interp_qlsp, this.lpcSize, 0.002f);
for (int i = 0; i < this.lpcSize; i++)
{
this.interp_lsp[i] = (float)Math.Cos((double)this.interp_lsp[i]);
}
this.m_lsp.Lsp2lpc(this.interp_lsp, this.interp_lpc, this.lpcSize);
for (int i = 0; i < this.lpcSize; i++)
{
this.interp_qlsp[i] = (float)Math.Cos((double)this.interp_qlsp[i]);
}
this.m_lsp.Lsp2lpc(this.interp_qlsp, this.interp_qlpc, this.lpcSize);
num18 = 1f;
this.pi_gain[k] = 0f;
for (int i = 0; i <= this.lpcSize; i++)
{
this.pi_gain[k] += num18 * this.interp_qlpc[i];
num18 = -num18;
}
Filters.Bw_lpc(this.gamma1, this.interp_lpc, this.bw_lpc1, this.lpcSize);
if (this.gamma2 >= 0f)
{
Filters.Bw_lpc(this.gamma2, this.interp_lpc, this.bw_lpc2, this.lpcSize);
}
else
{
this.bw_lpc2[0] = 1f;
this.bw_lpc2[1] = -this.preemph;
for (int i = 2; i <= this.lpcSize; i++)
{
this.bw_lpc2[i] = 0f;
}
}
for (int i = 0; i < this.subframeSize; i++)
{
this.excBuf[num15 + i] = 0f;
}
this.excBuf[num15] = 1f;
Filters.Syn_percep_zero(this.excBuf, num15, this.interp_qlpc, this.bw_lpc1, this.bw_lpc2, array5, this.subframeSize, this.lpcSize);
for (int i = 0; i < this.subframeSize; i++)
{
this.excBuf[num15 + i] = 0f;
}
for (int i = 0; i < this.subframeSize; i++)
{
this.exc2Buf[num17 + i] = 0f;
}
for (int i = 0; i < this.lpcSize; i++)
{
array6[i] = this.mem_sp[i];
}
Filters.Iir_mem2(this.excBuf, num15, this.interp_qlpc, this.excBuf, num15, this.subframeSize, this.lpcSize, array6);
for (int i = 0; i < this.lpcSize; i++)
{
array6[i] = this.mem_sw[i];
}
Filters.Filter_mem2(this.excBuf, num15, this.bw_lpc1, this.bw_lpc2, array3, 0, this.subframeSize, this.lpcSize, array6, 0);
for (int i = 0; i < this.lpcSize; i++)
{
array6[i] = this.mem_sw[i];
}
Filters.Filter_mem2(this.frmBuf, num14, this.bw_lpc1, this.bw_lpc2, this.swBuf, num16, this.subframeSize, this.lpcSize, array6, 0);
for (int i = 0; i < this.subframeSize; i++)
{
array4[i] = this.swBuf[num16 + i] - array3[i];
}
for (int i = 0; i < this.subframeSize; i++)
{
this.excBuf[num15 + i] = (this.exc2Buf[num17 + i] = 0f);
}
int start;
int num19;
if (this.submodes[this.submodeID].LbrPitch != -1)
{
int lbrPitch = this.submodes[this.submodeID].LbrPitch;
if (lbrPitch != 0)
{
if (num3 < this.min_pitch + lbrPitch - 1)
{
num3 = this.min_pitch + lbrPitch - 1;
}
if (num3 > this.max_pitch - lbrPitch)
{
num3 = this.max_pitch - lbrPitch;
}
start = num3 - lbrPitch + 1;
num19 = num3 + lbrPitch;
}
else
{
num19 = (start = num3);
}
}
else
{
start = this.min_pitch;
num19 = this.max_pitch;
}
if (this.bounded_pitch != 0 && num19 > num13)
{
num19 = num13;
}
int num20 = this.submodes[this.submodeID].Ltp.Quant(array4, this.swBuf, num16, this.interp_qlpc, this.bw_lpc1, this.bw_lpc2, this.excBuf, num15, start, num19, num4, this.lpcSize, this.subframeSize, bits, this.exc2Buf, num17, array5, this.complexity);
this.pitch[k] = num20;
Filters.Syn_percep_zero(this.excBuf, num15, this.interp_qlpc, this.bw_lpc1, this.bw_lpc2, array3, this.subframeSize, this.lpcSize);
for (int i = 0; i < this.subframeSize; i++)
{
array4[i] -= array3[i];
}
float num21 = 0f;
int num22 = k * this.subframeSize;
for (int i = 0; i < this.subframeSize; i++)
{
this.innov[num22 + i] = 0f;
}
Filters.Residue_percep_zero(array4, 0, this.interp_qlpc, this.bw_lpc1, this.bw_lpc2, this.buf2, this.subframeSize, this.lpcSize);
for (int i = 0; i < this.subframeSize; i++)
{
num21 += this.buf2[i] * this.buf2[i];
}
num21 = (float)Math.Sqrt((double)(0.1f + num21 / (float)this.subframeSize));
num21 /= num5;
if (this.submodes[this.submodeID].HaveSubframeGain != 0)
{
num21 = (float)Math.Log((double)num21);
if (this.submodes[this.submodeID].HaveSubframeGain == 3)
{
int num23 = VQ.Index(num21, NbCodec.exc_gain_quant_scal3, 8);
bits.Pack(num23, 3);
num21 = NbCodec.exc_gain_quant_scal3[num23];
}
else
{
int num23 = VQ.Index(num21, NbCodec.exc_gain_quant_scal1, 2);
bits.Pack(num23, 1);
num21 = NbCodec.exc_gain_quant_scal1[num23];
}
num21 = (float)Math.Exp((double)num21);
}
else
{
num21 = 1f;
}
num21 *= num5;
float num24 = 1f / num21;
for (int i = 0; i < this.subframeSize; i++)
{
array4[i] *= num24;
}
this.submodes[this.submodeID].Innovation.Quantify(array4, this.interp_qlpc, this.bw_lpc1, this.bw_lpc2, this.lpcSize, this.subframeSize, this.innov, num22, array5, bits, this.complexity);
for (int i = 0; i < this.subframeSize; i++)
{
this.innov[num22 + i] *= num21;
}
for (int i = 0; i < this.subframeSize; i++)
{
this.excBuf[num15 + i] += this.innov[num22 + i];
}
if (this.submodes[this.submodeID].DoubleCodebook != 0)
{
float[] array8 = new float[this.subframeSize];
for (int i = 0; i < this.subframeSize; i++)
{
array4[i] *= 2.2f;
}
this.submodes[this.submodeID].Innovation.Quantify(array4, this.interp_qlpc, this.bw_lpc1, this.bw_lpc2, this.lpcSize, this.subframeSize, array8, 0, array5, bits, this.complexity);
for (int i = 0; i < this.subframeSize; i++)
{
array8[i] *= (float)((double)num21 * 0.45454545454545453);
}
for (int i = 0; i < this.subframeSize; i++)
{
this.excBuf[num15 + i] += array8[i];
}
}
for (int i = 0; i < this.subframeSize; i++)
{
array4[i] *= num21;
}
for (int i = 0; i < this.lpcSize; i++)
{
array6[i] = this.mem_sp[i];
}
Filters.Iir_mem2(this.excBuf, num15, this.interp_qlpc, this.frmBuf, num14, this.subframeSize, this.lpcSize, this.mem_sp);
Filters.Filter_mem2(this.frmBuf, num14, this.bw_lpc1, this.bw_lpc2, this.swBuf, num16, this.subframeSize, this.lpcSize, this.mem_sw, 0);
for (int i = 0; i < this.subframeSize; i++)
{
this.exc2Buf[num17 + i] = this.excBuf[num15 + i];
}
}
if (this.submodeID >= 1)
{
for (int i = 0; i < this.lpcSize; i++)
{
this.old_lsp[i] = this.lsp[i];
}
for (int i = 0; i < this.lpcSize; i++)
{
this.old_qlsp[i] = this.qlsp[i];
}
}
if (this.submodeID == 1)
{
if (this.dtx_count != 0)
{
bits.Pack(15, 4);
}
else
{
bits.Pack(0, 4);
}
}
this.first = 0;
float num25 = 0f;
float num26 = 0f;
for (int i = 0; i < this.frameSize; i++)
{
num25 += this.frmBuf[this.frmIdx + i] * this.frmBuf[this.frmIdx + i];
num26 += (this.frmBuf[this.frmIdx + i] - array7[i]) * (this.frmBuf[this.frmIdx + i] - array7[i]);
}
ins0[0] = this.frmBuf[this.frmIdx] + this.preemph * this.pre_mem2;
for (int i = 1; i < this.frameSize; i++)
{
ins0[i] = this.frmBuf[this.frmIdx + i] + this.preemph * ins0[i - 1];
}
this.pre_mem2 = ins0[this.frameSize - 1];
if (this.submodes[this.submodeID].Innovation is NoiseSearch || this.submodeID == 0)
{
this.bounded_pitch = 1;
}
else
{
this.bounded_pitch = 0;
}
return(1);
}
/// <summary>
/// Transforms a stereo frame into a mono frame and stores intensity stereo
/// info in 'bits'.
/// </summary>
public static void Encode(Bits bits, SpeexWord16[] data, int frameSize)
{
#if FIXED_POINT
int i, tmp;
SpeexWord32 e_left = 0, e_right = 0, e_tot = 0;
SpeexWord32 balance, e_ratio;
SpeexWord32 largest, smallest;
int shift;
int balance_id;
/* In band marker */
bits.Pack(14, 5);
/* Stereo marker */
bits.Pack(SPEEX_INBAND_STEREO, 4);
for (i = 0; i < frameSize; i++)
{
e_left += (data[2 * i] * data[2 * i]) >> 8;
e_right += (data[2 * i + 1] * data[2 * i + 1]) >> 8;
data[i] = (SpeexWord16)((data[2 * i] >> 1) + (data[2 * i + 1] >> 1));
e_tot += (data[i] * data[i]) >> 8;
}
if (e_left > e_right)
{
bits.Pack(0, 1);
largest = e_left;
smallest = e_right;
}
else
{
bits.Pack(1, 1);
largest = e_right;
smallest = e_left;
}
/* Balance quantization */
// ???
shift = (int)Math.Log(smallest, 2) - 15;
largest >>= shift;
smallest >>= shift;
balance = Math.Min(largest / (smallest + 1), 32767);
balance_id = VQ.Index((short)balance, balance_bounds, balance_bounds.Length);
bits.Pack((int)balance_id, 5);
/* "coherence" quantisation */
shift = (int)Math.Log(e_tot, 2);
e_tot >>= shift - 25;
e_left >>= shift - 10;
e_right >>= shift - 10;
e_ratio = e_tot / (e_left + e_right + 1);
tmp = NSpeex.VQ.Index((short)e_ratio, e_ratio_quant_bounds, 4);
bits.Pack(tmp, 2);
#else
int i, tmp;
float e_left = 0, e_right = 0, e_tot = 0;
float balance_0, e_ratio_1;
for (i = 0; i < frameSize; i++)
{
e_left += data[2 * i] * data[2 * i];
e_right += data[2 * i + 1] * data[2 * i + 1];
data[i] = .5f * (data[2 * i] + data[2 * i + 1]);
e_tot += data[i] * data[i];
}
balance_0 = (e_left + 1) / (e_right + 1);
e_ratio_1 = e_tot / (1 + e_left + e_right);
/* Quantization */
bits.Pack(14, 5);
bits.Pack(SPEEX_INBAND_STEREO, 4);
balance_0 = (float)(4 * Math.Log(balance_0));
/* Pack balance */
if (balance_0 > 0)
{
bits.Pack(0, 1);
}
else
{
bits.Pack(1, 1);
}
balance_0 = (float)Math.Floor(.5f + Math.Abs(balance_0));
if (balance_0 > 30)
{
balance_0 = 31;
}
bits.Pack((int)balance_0, 5);
/* Quantize energy ratio */
tmp = NSpeex.VQ.Index(e_ratio_1, e_ratio_quant, 4);
bits.Pack(tmp, 2);
#endif
}
