override internal Object look(DspState vd, InfoMode mi, Object i)
{
float scale;
Info vi = vd.vi;
InfoFloor0 info = (InfoFloor0)i;
LookFloor0 look = new LookFloor0();
look.m = info.order;
look.n = vi.blocksizes[mi.blockflag] / 2;
look.ln = info.barkmap;
look.vi = info;
look.lpclook.init(look.ln, look.m);
// we choose a scaling constant so that:
scale = look.ln / toBARK((float)(info.rate / 2.0f));
// the mapping from a linear scale to a smaller bark scale is
// straightforward. We do *not* make sure that the linear mapping
// does not skip bark-scale bins; the decoder simply skips them and
// the encoder may do what it wishes in filling them. They're
// necessary in some mapping combinations to keep the scale spacing
// accurate
look.linearmap = new int[look.n];
for (int j = 0; j < look.n; j++)
{
int val = (int)Math.Floor(toBARK((float)((info.rate / 2.0f) / look.n * j)) * scale); // bark numbers represent band edges
if (val >= look.ln)
{
val = look.ln; // guard against the approximation
}
look.linearmap[j] = val;
}
return(look);
}
override internal Object inverse1(Block vb, Object i, Object memo)
{
LookFloor0 look = (LookFloor0)i;
InfoFloor0 info = look.vi;
float[] lsp = null;
if (memo is float[])
{
lsp = (float[])memo;
}
int ampraw = vb.opb.Read(info.ampbits);
if (ampraw > 0)
{ // also handles the -1 out of data case
int maxval = (1 << info.ampbits) - 1;
float amp = (float)ampraw / maxval * info.ampdB;
int booknum = vb.opb.Read(Util.ilog(info.numbooks));
if (booknum != -1 && booknum < info.numbooks)
{
CodeBook b = vb.vd.fullbooks[info.books[booknum]];
float last = 0.0f;
if (lsp == null || lsp.Length < look.m + 1)
{
lsp = new float[look.m + 1];
}
else
{
for (int j = 0; j < lsp.Length; j++)
{
lsp[j] = 0.0f;
}
}
for (int j = 0; j < look.m; j += b.dim)
{
if (b.decodev_set(lsp, j, vb.opb, b.dim) == -1)
{
return(null);
}
}
for (int j = 0; j < look.m;)
{
for (int k = 0; k < b.dim; k++, j++)
{
lsp[j] += last;
}
last = lsp[j - 1];
}
lsp[look.m] = amp;
return(lsp);
}
}
return(null);
}
internal static void lpc_to_curve(float[] curve, float[] lpc, float amp, LookFloor0 l,
String name, int frameno)
{
// l->m+1 must be less than l->ln, but guard in case we get a bad stream
float[] lcurve = new float[Math.Max(l.ln * 2, l.m * 2 + 2)];
if (amp == 0)
{
for (int j = 0; j < l.n; j++)
curve[j] = 0.0f;
return;
}
l.lpclook.lpc_to_curve(lcurve, lpc, amp);
for (int i = 0; i < l.n; i++)
curve[i] = lcurve[l.linearmap[i]];
}
override internal int inverse2(Block vb, Object i, Object memo, float[] Out)
{
LookFloor0 look = (LookFloor0)i;
InfoFloor0 info = look.vi;
if (memo != null)
{
float[] lsp = (float[])memo;
float amp = lsp[look.m];
Lsp.lsp_to_curve(Out, look.linearmap, look.n, look.ln, lsp, look.m, amp, info.ampdB);
return(1);
}
for (int j = 0; j < look.n; j++)
{
Out[j] = 0.0f;
}
return(0);
}
static internal void lpc_to_curve(float[] curve, float[] lpc, float amp, LookFloor0 l,
String name, int frameno)
{
// l->m+1 must be less than l->ln, but guard in case we get a bad stream
float[] lcurve = new float[Math.Max(l.ln * 2, l.m * 2 + 2)];
if (amp == 0)
{
for (int j = 0; j < l.n; j++)
{
curve[j] = 0.0f;
}
return;
}
l.lpclook.lpc_to_curve(lcurve, lpc, amp);
for (int i = 0; i < l.n; i++)
{
curve[i] = lcurve[l.linearmap[i]];
}
}
internal override Object look(DspState vd, InfoMode mi, Object i)
{
float scale;
Info vi = vd.vi;
InfoFloor0 info = (InfoFloor0)i;
LookFloor0 look = new LookFloor0();
look.m = info.order;
look.n = vi.blocksizes[mi.blockflag] / 2;
look.ln = info.barkmap;
look.vi = info;
look.lpclook.init(look.ln, look.m);
// we choose a scaling constant so that:
scale = look.ln / toBARK((float)(info.rate / 2.0f));
// the mapping from a linear scale to a smaller bark scale is
// straightforward. We do *not* make sure that the linear mapping
// does not skip bark-scale bins; the decoder simply skips them and
// the encoder may do what it wishes in filling them. They're
// necessary in some mapping combinations to keep the scale spacing
// accurate
look.linearmap = new int[look.n];
for (int j = 0; j < look.n; j++)
{
int val = (int)Math.Floor(toBARK((float)((info.rate / 2.0f) / look.n * j)) * scale); // bark numbers represent band edges
if (val >= look.ln)
val = look.ln; // guard against the approximation
look.linearmap[j] = val;
}
return look;
}
internal int inverse(Block vb, Object i, float[] Out)
{
//System.err.println("Floor0.inverse "+i.getClass()+"]");
LookFloor0 look = (LookFloor0)i;
InfoFloor0 info = look.vi;
int ampraw = vb.opb.Read(info.ampbits);
if (ampraw > 0)
{ // also handles the -1 out of data case
int maxval = (1 << info.ampbits) - 1;
float amp = (float)ampraw / maxval * info.ampdB;
int booknum = vb.opb.Read(Util.ilog(info.numbooks));
if (booknum != -1 && booknum < info.numbooks)
{
lock (this)
{
if (lsp == null || lsp.Length < look.m)
{
lsp = new float[look.m];
}
else
{
for (int j = 0; j < look.m; j++)
{
lsp[j] = 0.0f;
}
}
CodeBook b = vb.vd.fullbooks[info.books[booknum]];
float last = 0.0f;
for (int j = 0; j < look.m; j++)
{
Out[j] = 0.0f;
}
for (int j = 0; j < look.m; j += b.dim)
{
if (b.decodevs(lsp, j, vb.opb, 1, -1) == -1)
{
for (int k = 0; k < look.n; k++)
{
Out[k] = 0.0f;
}
return(0);
}
}
for (int j = 0; j < look.m;)
{
for (int k = 0; k < b.dim; k++, j++)
{
lsp[j] += last;
}
last = lsp[j - 1];
}
// take the coefficients back to a spectral envelope curve
Lsp.lsp_to_curve(Out, look.linearmap, look.n, look.ln, lsp, look.m,
amp, info.ampdB);
return(1);
}
}
}
return(0);
}
