コード例 #1
0
        static Mdct GetSetup(int n)
        {
            lock (_setupCache)
            {
                if (!_setupCache.ContainsKey(n))
                {
                    _setupCache[n] = new Mdct(n);
                }

                return(_setupCache[n]);
            }
        }
コード例 #2
0
ファイル: Mdct.cs プロジェクト: AmonRGT/CSLMusicMod
        static Mdct GetSetup(int n)
        {
            lock (_setupCache)
            {
                if (!_setupCache.ContainsKey(n))
                {
                    _setupCache[n] = new Mdct(n);
                }

                return _setupCache[n];
            }
        }
コード例 #3
0
        void DecodePacket()
        {
            // inverse coupling
            var steps     = _mode.Mapping.CouplingSteps;
            var halfSizeW = _mode.BlockSize / 2;

            for (int i = steps.Length - 1; i >= 0; i--)
            {
                if (_floorData[steps[i].Angle].ExecuteChannel || _floorData[steps[i].Magnitude].ExecuteChannel)
                {
                    var magnitude = _residue[steps[i].Magnitude];
                    var angle     = _residue[steps[i].Angle];

                    // we only have to do the first half; MDCT ignores the last half
                    for (int j = 0; j < halfSizeW; j++)
                    {
                        float newM, newA;

                        if (magnitude[j] > 0)
                        {
                            if (angle[j] > 0)
                            {
                                newM = magnitude[j];
                                newA = magnitude[j] - angle[j];
                            }
                            else
                            {
                                newA = magnitude[j];
                                newM = magnitude[j] + angle[j];
                            }
                        }
                        else
                        {
                            if (angle[j] > 0)
                            {
                                newM = magnitude[j];
                                newA = magnitude[j] + angle[j];
                            }
                            else
                            {
                                newA = magnitude[j];
                                newM = magnitude[j] - angle[j];
                            }
                        }

                        magnitude[j] = newM;
                        angle[j]     = newA;
                    }
                }
            }

            // apply floor / dot product / MDCT (only run if we have sound energy in that channel)
            for (int c = 0; c < _channels; c++)
            {
                var floorData = _floorData[c];
                var res       = _residue[c];
                if (floorData.ExecuteChannel)
                {
                    _mode.Mapping.ChannelSubmap[c].Floor.Apply(floorData, res);
                    Mdct.Reverse(res, _mode.BlockSize);
                }
                else
                {
                    // since we aren't doing the IMDCT, we have to explicitly clear the back half of the block
                    Array.Clear(res, halfSizeW, halfSizeW);
                }
            }
        }