override internal Object look(DspState vd, InfoMode vm, Object vr)
{
InfoResidue0 info = (InfoResidue0)vr;
LookResidue0 look = new LookResidue0();
int acc = 0;
int dim;
int maxstage = 0;
look.info = info;
look.map = vm.mapping;
look.parts = info.partitions;
look.fullbooks = vd.fullbooks;
look.phrasebook = vd.fullbooks[info.groupbook];
dim = look.phrasebook.dim;
look.partbooks = new int[look.parts][];
for (int j = 0; j < look.parts; j++)
{
int i = info.secondstages[j];
int stages = Util.ilog(i);
if (stages != 0)
{
if (stages > maxstage)
{
maxstage = stages;
}
look.partbooks[j] = new int[stages];
for (int k = 0; k < stages; k++)
{
if ((i & (1 << k)) != 0)
{
look.partbooks[j][k] = info.booklist[acc++];
}
}
}
}
look.partvals = (int)Math.Round(Math.Pow(look.parts, dim));
look.stages = maxstage;
look.decodemap = new int[look.partvals][];
for (int j = 0; j < look.partvals; j++)
{
int val = j;
int mult = look.partvals / look.parts;
look.decodemap[j] = new int[dim];
for (int k = 0; k < dim; k++)
{
int deco = val / mult;
val -= deco * mult;
mult /= look.parts;
look.decodemap[j][k] = deco;
}
}
return(look);
}
override internal Object unpack(Info vi, NVorbis.Ogg.BBuffer opb)
{
int acc = 0;
InfoResidue0 info = new InfoResidue0();
info.begin = opb.Read(24);
info.end = opb.Read(24);
info.grouping = opb.Read(24) + 1;
info.partitions = opb.Read(6) + 1;
info.groupbook = opb.Read(8);
for (int j = 0; j < info.partitions; j++)
{
int cascade = opb.Read(3);
if (opb.Read(1) != 0)
{
cascade |= (opb.Read(5) << 3);
}
info.secondstages[j] = cascade;
acc += Util.icount(cascade);
}
for (int j = 0; j < acc; j++)
{
info.booklist[j] = opb.Read(8);
}
if (info.groupbook >= vi.Books)
{
free_info(info);
return(null);
}
for (int j = 0; j < acc; j++)
{
if (info.booklist[j] >= vi.Books)
{
free_info(info);
return(null);
}
}
return(info);
}
override internal void pack(Object vr, NVorbis.Ogg.BBuffer opb)
{
InfoResidue0 info = (InfoResidue0)vr;
int acc = 0;
opb.Write(info.begin, 24);
opb.Write(info.end, 24);
opb.Write(info.grouping - 1, 24); /* residue vectors to group and
* code with a partitioned book */
opb.Write(info.partitions - 1, 6); /* possible partition choices */
opb.Write(info.groupbook, 8); /* group huffman book */
/* secondstages is a bitmask; as encoding progresses pass by pass, a
* bitmask of one indicates this partition class has bits to write
* this pass */
for (int j = 0; j < info.partitions; j++)
{
int i = info.secondstages[j];
if (Util.ilog(i) > 3)
{
/* yes, this is a minor hack due to not thinking ahead */
opb.Write(i, 3);
opb.Write(1, 1);
opb.Write((int)(((uint)i) >> 3), 5);
}
else
{
opb.Write(i, 4); /* trailing zero */
}
acc += Util.icount(i);
}
for (int j = 0; j < acc; j++)
{
opb.Write(info.booklist[j], 8);
}
}
internal override Object unpack(Info vi, NVorbis.Ogg.BBuffer opb)
{
int acc = 0;
InfoResidue0 info = new InfoResidue0();
info.begin = opb.Read(24);
info.end = opb.Read(24);
info.grouping = opb.Read(24) + 1;
info.partitions = opb.Read(6) + 1;
info.groupbook = opb.Read(8);
for (int j = 0; j < info.partitions; j++)
{
int cascade = opb.Read(3);
if (opb.Read(1) != 0)
{
cascade |= (opb.Read(5) << 3);
}
info.secondstages[j] = cascade;
acc += Util.icount(cascade);
}
for (int j = 0; j < acc; j++)
{
info.booklist[j] = opb.Read(8);
}
if (info.groupbook >= vi.Books)
{
free_info(info);
return (null);
}
for (int j = 0; j < acc; j++)
{
if (info.booklist[j] >= vi.Books)
{
free_info(info);
return (null);
}
}
return (info);
}
static internal int _2inverse(Block vb, Object vl, float[][] In, int ch)
{
lock (StatickLock)
{
int i, k, l, s;
LookResidue0 look = (LookResidue0)vl;
InfoResidue0 info = look.info;
// move all this setup out later
int samples_per_partition = info.grouping;
int partitions_per_word = look.phrasebook.dim;
int n = info.end - info.begin;
int partvals = n / samples_per_partition;
int partwords = (partvals + partitions_per_word - 1) / partitions_per_word;
if (_2inverse_partword == null || _2inverse_partword.Length < partwords)
{
_2inverse_partword = new int[partwords][];
}
for (s = 0; s < look.stages; s++)
{
for (i = 0, l = 0; i < partvals; l++)
{
if (s == 0)
{
// fetch the partition word for each channel
int temp = look.phrasebook.decode(vb.opb);
if (temp == -1)
{
return(0);
}
_2inverse_partword[l] = look.decodemap[temp];
if (_2inverse_partword[l] == null)
{
return(0);
}
}
// now we decode residual values for the partitions
for (k = 0; k < partitions_per_word && i < partvals; k++, i++)
{
int offset = info.begin + i * samples_per_partition;
int index = _2inverse_partword[l][k];
if ((info.secondstages[index] & (1 << s)) != 0)
{
CodeBook stagebook = look.fullbooks[look.partbooks[index][s]];
if (stagebook != null)
{
if (stagebook.decodevv_add(In, offset, ch, vb.opb,
samples_per_partition) == -1)
{
return(0);
}
}
}
}
}
}
return(0);
}
}
