inverse() public abstract method

public abstract inverse ( Block vd, Object lm ) : int
vd Block
lm Object
return int
FuncMapping Class Documentation
Esempio n. 1
0
        public int synthesis(Packet op)
        {
            Info vi = vd.vi;

            opb.readinit(op.packet_base, op.packet, op.bytes);
            opb.read(1);
            // read our mode and pre/post windowsize
            mode = opb.read(vd.modebits);
            W    = vi.mode_param[mode].blockflag;
            if (W != 0)
            {
                lW = opb.read(1); nW = opb.read(1);
            }
            else
            {
                lW = 0; nW = 0;
            }

            // more setup
            granulepos = op.granulepos;
            sequence   = op.packetno - 3;         // first block is third packet
            eofflag    = op.e_o_s;

            // alloc pcm passback storage
            pcmend = vi.blocksizes[W];
            if (pcm.Length < vi.channels)
            {
                pcm = new float[vi.channels][];
            }

            for (int i = 0; i < vi.channels; i++)
            {
                if (pcm[i] == null || pcm[i].Length < pcmend)
                {
                    pcm[i] = new float[pcmend];
                }
                else
                {
                    for (int j = 0; j < pcmend; j++)
                    {
                        pcm[i][j] = 0;
                    }
                }
            }

            // unpack_header enforces range checking
            FuncMapping mapping = vi.map_funcs[vi.mode_param[mode].mapping];

            return(mapping.inverse(this, vd.mode[mode]));
        }