/// <summary>Speex in-band request (submode=14).</summary>
/// <remarks>Speex in-band request (submode=14).</remarks>
/// <param name="bits">- Speex bits buffer.</param>
/// <exception cref="java.io.StreamCorruptedException">If stream seems corrupted.</exception>
public virtual void speexInbandRequest(org.xiph.speex.Bits bits)
{
int code = bits.unpack(4);
switch (code)
{
case 0:
{
// asks the decoder to set perceptual enhancment off (0) or on (1)
bits.advance(1);
break;
}
case 1:
{
// asks (if 1) the encoder to be less "aggressive" due to high packet loss
bits.advance(1);
break;
}
case 2:
{
// asks the encoder to switch to mode N
bits.advance(4);
break;
}
case 3:
{
// asks the encoder to switch to mode N for low-band
bits.advance(4);
break;
}
case 4:
{
// asks the encoder to switch to mode N for high-band
bits.advance(4);
break;
}
case 5:
{
// asks the encoder to switch to quality N for VBR
bits.advance(4);
break;
}
case 6:
{
// request acknowledgement (0=no, 1=all, 2=only for inband data)
bits.advance(4);
break;
}
case 7:
{
// asks the encoder to set CBR(0), VAD(1), DTX(3), VBR(5), VBR+DTX(7)
bits.advance(4);
break;
}
case 8:
{
// transmit (8-bit) character to the other end
bits.advance(8);
break;
}
case 9:
{
// intensity stereo information
// setup the stereo decoder; to skip: tmp = bits.unpack(8); break;
stereo.init(bits);
// read 8 bits
break;
}
case 10:
{
// announce maximum bit-rate acceptable (N in byets/second)
bits.advance(16);
break;
}
case 11:
{
// reserved
bits.advance(16);
break;
}
case 12:
{
// Acknowledge receiving packet N
bits.advance(32);
break;
}
case 13:
{
// reserved
bits.advance(32);
break;
}
case 14:
{
// reserved
bits.advance(64);
break;
}
case 15:
{
// reserved
bits.advance(64);
break;
}
default:
{
break;
}
}
}
/// <summary>Decode the given input bits.</summary>
/// <remarks>Decode the given input bits.</remarks>
/// <param name="bits">- Speex bits buffer.</param>
/// <param name="out">- the decoded mono audio frame.</param>
/// <returns>1 if a terminator was found, 0 if not.</returns>
/// <exception cref="java.io.StreamCorruptedException">
/// If there is an error detected in the
/// data stream.
/// </exception>
public virtual int decode(org.xiph.speex.Bits bits, float[] @out)
{
int i;
int sub;
int pitch;
int ol_pitch = 0;
int m;
float[] pitch_gain = new float[3];
float ol_gain = 0.0f;
float ol_pitch_coef = 0.0f;
int best_pitch = 40;
float best_pitch_gain = 0;
float pitch_average = 0;
if (bits == null && dtx_enabled != 0)
{
submodeID = 0;
}
else
{
if (bits == null)
{
decodeLost(@out);
return 0;
}
do
{
if (bits.unpack(1) != 0)
{
//Wideband
m = bits.unpack(org.xiph.speex.SbCodec.SB_SUBMODE_BITS);
int advance = org.xiph.speex.SbCodec.SB_FRAME_SIZE[m];
if (advance < 0)
{
throw new java.io.StreamCorruptedException("Invalid sideband mode encountered (1st sideband): "
+ m);
}
//return -2;
advance -= (org.xiph.speex.SbCodec.SB_SUBMODE_BITS + 1);
bits.advance(advance);
if (bits.unpack(1) != 0)
{
m = bits.unpack(org.xiph.speex.SbCodec.SB_SUBMODE_BITS);
advance = org.xiph.speex.SbCodec.SB_FRAME_SIZE[m];
if (advance < 0)
{
throw new java.io.StreamCorruptedException("Invalid sideband mode encountered. (2nd sideband): "
+ m);
}
//return -2;
advance -= (org.xiph.speex.SbCodec.SB_SUBMODE_BITS + 1);
bits.advance(advance);
if (bits.unpack(1) != 0)
{
throw new java.io.StreamCorruptedException("More than two sideband layers found");
}
}
}
//return -2;
//*/
m = bits.unpack(NB_SUBMODE_BITS);
if (m == 15)
{
return 1;
}
else
{
if (m == 14)
{
inband.speexInbandRequest(bits);
}
else
{
if (m == 13)
{
inband.userInbandRequest(bits);
}
else
{
if (m > 8)
{
throw new java.io.StreamCorruptedException("Invalid mode encountered: " + m);
}
}
}
}
}
while (m > 8);
//return -2;
submodeID = m;
}
System.Array.Copy(frmBuf, frameSize, frmBuf, 0, bufSize - frameSize);
System.Array.Copy(excBuf, frameSize, excBuf, 0, bufSize - frameSize);
if (submodes[submodeID] == null)
{
org.xiph.speex.Filters.bw_lpc(.93f, interp_qlpc, lpc, 10);
float innov_gain = 0;
for (i = 0; i < frameSize; i++)
{
innov_gain += innov[i] * innov[i];
}
innov_gain = (float)System.Math.Sqrt(innov_gain / frameSize);
for (i = excIdx; i < excIdx + frameSize; i++)
{
excBuf[i] = 3 * innov_gain * (random.nextFloat() - .5f);
}
first = 1;
org.xiph.speex.Filters.iir_mem2(excBuf, excIdx, lpc, frmBuf, frmIdx, frameSize, lpcSize
, mem_sp);
@out[0] = frmBuf[frmIdx] + preemph * pre_mem;
for (i = 1; i < frameSize; i++)
{
@out[i] = frmBuf[frmIdx + i] + preemph * @out[i - 1];
}
pre_mem = @out[frameSize - 1];
count_lost = 0;
return 0;
}
submodes[submodeID].lsqQuant.unquant(qlsp, lpcSize, bits);
if (count_lost != 0)
{
float lsp_dist = 0;
float fact;
for (i = 0; i < lpcSize; i++)
{
lsp_dist += System.Math.Abs(old_qlsp[i] - qlsp[i]);
}
fact = (float)(.6 * System.Math.Exp(-.2 * lsp_dist));
for (i = 0; i < 2 * lpcSize; i++)
{
mem_sp[i] *= fact;
}
}
if (first != 0 || count_lost != 0)
{
for (i = 0; i < lpcSize; i++)
{
old_qlsp[i] = qlsp[i];
}
}
if (submodes[submodeID].lbr_pitch != -1)
{
ol_pitch = min_pitch + bits.unpack(7);
}
if (submodes[submodeID].forced_pitch_gain != 0)
{
int quant = bits.unpack(4);
ol_pitch_coef = 0.066667f * quant;
}
int qe = bits.unpack(5);
ol_gain = (float)System.Math.Exp(qe / 3.5);
if (submodeID == 1)
{
int extra = bits.unpack(4);
if (extra == 15)
{
dtx_enabled = 1;
}
else
{
dtx_enabled = 0;
}
}
if (submodeID > 1)
{
dtx_enabled = 0;
}
for (sub = 0; sub < nbSubframes; sub++)
{
int offset;
int spIdx;
int extIdx;
float tmp;
offset = subframeSize * sub;
spIdx = frmIdx + offset;
extIdx = excIdx + offset;
tmp = (1.0f + sub) / nbSubframes;
for (i = 0; i < lpcSize; i++)
{
interp_qlsp[i] = (1 - tmp) * old_qlsp[i] + tmp * qlsp[i];
}
org.xiph.speex.Lsp.enforce_margin(interp_qlsp, lpcSize, .002f);
for (i = 0; i < lpcSize; i++)
{
interp_qlsp[i] = (float)System.Math.Cos(interp_qlsp[i]);
}
m_lsp.lsp2lpc(interp_qlsp, interp_qlpc, lpcSize);
if (enhanced)
{
float r = .9f;
float k1;
float k2;
float k3;
k1 = submodes[submodeID].lpc_enh_k1;
k2 = submodes[submodeID].lpc_enh_k2;
k3 = (1 - (1 - r * k1) / (1 - r * k2)) / r;
org.xiph.speex.Filters.bw_lpc(k1, interp_qlpc, awk1, lpcSize);
org.xiph.speex.Filters.bw_lpc(k2, interp_qlpc, awk2, lpcSize);
org.xiph.speex.Filters.bw_lpc(k3, interp_qlpc, awk3, lpcSize);
}
tmp = 1;
pi_gain[sub] = 0;
for (i = 0; i <= lpcSize; i++)
{
pi_gain[sub] += tmp * interp_qlpc[i];
tmp = -tmp;
}
for (i = 0; i < subframeSize; i++)
{
excBuf[extIdx + i] = 0;
}
int pit_min;
int pit_max;
if (submodes[submodeID].lbr_pitch != -1)
{
int margin = submodes[submodeID].lbr_pitch;
if (margin != 0)
{
pit_min = ol_pitch - margin + 1;
if (pit_min < min_pitch)
{
pit_min = min_pitch;
}
pit_max = ol_pitch + margin;
if (pit_max > max_pitch)
{
pit_max = max_pitch;
}
}
else
{
pit_min = pit_max = ol_pitch;
}
}
else
{
pit_min = min_pitch;
pit_max = max_pitch;
}
pitch = submodes[submodeID].ltp.unquant(excBuf, extIdx, pit_min, ol_pitch_coef, subframeSize
, pitch_gain, bits, count_lost, offset, last_pitch_gain);
if (count_lost != 0 && ol_gain < last_ol_gain)
{
float fact = ol_gain / (last_ol_gain + 1);
for (i = 0; i < subframeSize; i++)
{
excBuf[excIdx + i] *= fact;
}
}
tmp = System.Math.Abs(pitch_gain[0] + pitch_gain[1] + pitch_gain[2]);
tmp = System.Math.Abs(pitch_gain[1]);
if (pitch_gain[0] > 0)
{
tmp += pitch_gain[0];
}
else
{
tmp -= (float)(.5 * pitch_gain[0]);
}
if (pitch_gain[2] > 0)
{
tmp += pitch_gain[2];
}
else
{
tmp -= (float)(.5 * pitch_gain[0]);
}
pitch_average += tmp;
if (tmp > best_pitch_gain)
{
best_pitch = pitch;
best_pitch_gain = tmp;
}
int q_energy;
int ivi = sub * subframeSize;
float ener;
for (i = ivi; i < ivi + subframeSize; i++)
{
innov[i] = 0.0f;
}
if (submodes[submodeID].have_subframe_gain == 3)
{
q_energy = bits.unpack(3);
ener = (float)(ol_gain * System.Math.Exp(exc_gain_quant_scal3[q_energy]));
}
else
{
if (submodes[submodeID].have_subframe_gain == 1)
{
q_energy = bits.unpack(1);
ener = (float)(ol_gain * System.Math.Exp(exc_gain_quant_scal1[q_energy]));
}
else
{
ener = ol_gain;
}
}
if (submodes[submodeID].innovation != null)
{
submodes[submodeID].innovation.unquant(innov, ivi, subframeSize, bits);
}
for (i = ivi; i < ivi + subframeSize; i++)
{
innov[i] *= ener;
}
if (submodeID == 1)
{
float g = ol_pitch_coef;
for (i = 0; i < subframeSize; i++)
{
excBuf[extIdx + i] = 0;
}
while (voc_offset < subframeSize)
{
if (voc_offset >= 0)
{
excBuf[extIdx + voc_offset] = (float)System.Math.Sqrt(1.0f * ol_pitch);
}
voc_offset += ol_pitch;
}
voc_offset -= subframeSize;
g = .5f + 2 * (g - .6f);
if (g < 0)
{
g = 0;
}
if (g > 1)
{
g = 1;
}
for (i = 0; i < subframeSize; i++)
{
float itmp = excBuf[extIdx + i];
excBuf[extIdx + i] = .8f * g * excBuf[extIdx + i] * ol_gain + .6f * g * voc_m1 *
ol_gain + .5f * g * innov[ivi + i] - .5f * g * voc_m2 + (1 - g) * innov[ivi + i];
voc_m1 = itmp;
voc_m2 = innov[ivi + i];
voc_mean = .95f * voc_mean + .05f * excBuf[extIdx + i];
excBuf[extIdx + i] -= voc_mean;
}
}
else
{
for (i = 0; i < subframeSize; i++)
{
excBuf[extIdx + i] += innov[ivi + i];
}
}
if (submodes[submodeID].double_codebook != 0)
{
for (i = 0; i < subframeSize; i++)
{
innov2[i] = 0;
}
submodes[submodeID].innovation.unquant(innov2, 0, subframeSize, bits);
for (i = 0; i < subframeSize; i++)
{
innov2[i] *= (float)(ener * (1 / 2.2));
}
for (i = 0; i < subframeSize; i++)
{
excBuf[extIdx + i] += innov2[i];
}
}
for (i = 0; i < subframeSize; i++)
{
frmBuf[spIdx + i] = excBuf[extIdx + i];
}
if (enhanced && submodes[submodeID].comb_gain > 0)
{
filters.comb_filter(excBuf, extIdx, frmBuf, spIdx, subframeSize, pitch, pitch_gain
, submodes[submodeID].comb_gain);
}
if (enhanced)
{
org.xiph.speex.Filters.filter_mem2(frmBuf, spIdx, awk2, awk1, subframeSize, lpcSize
, mem_sp, lpcSize);
org.xiph.speex.Filters.filter_mem2(frmBuf, spIdx, awk3, interp_qlpc, subframeSize
, lpcSize, mem_sp, 0);
}
else
{
for (i = 0; i < lpcSize; i++)
{
mem_sp[lpcSize + i] = 0;
}
org.xiph.speex.Filters.iir_mem2(frmBuf, spIdx, interp_qlpc, frmBuf, spIdx, subframeSize
, lpcSize, mem_sp);
}
}
@out[0] = frmBuf[frmIdx] + preemph * pre_mem;
for (i = 1; i < frameSize; i++)
{
@out[i] = frmBuf[frmIdx + i] + preemph * @out[i - 1];
}
pre_mem = @out[frameSize - 1];
for (i = 0; i < lpcSize; i++)
{
old_qlsp[i] = qlsp[i];
}
first = 0;
count_lost = 0;
last_pitch = best_pitch;
last_pitch_gain = .25f * pitch_average;
pitch_gain_buf[pitch_gain_buf_idx++] = last_pitch_gain;
if (pitch_gain_buf_idx > 2)
{
pitch_gain_buf_idx = 0;
}
last_ol_gain = ol_gain;
return 0;
}
/// <summary>User in-band request (submode=13).</summary>
/// <remarks>User in-band request (submode=13).</remarks>
/// <param name="bits">- Speex bits buffer.</param>
/// <exception cref="java.io.StreamCorruptedException">If stream seems corrupted.</exception>
public virtual void userInbandRequest(org.xiph.speex.Bits bits)
{
int req_size = bits.unpack(4);
bits.advance(5 + 8 * req_size);
}