コード例 #1
0
ファイル: VorbisMode.cs プロジェクト: AmonRGT/CSLMusicMod
        internal static VorbisMode Init(VorbisStreamDecoder vorbis, DataPacket packet)
        {
            var mode = new VorbisMode(vorbis);
            mode.BlockFlag = packet.ReadBit();
            mode.WindowType = (int)packet.ReadBits(16);
            mode.TransformType = (int)packet.ReadBits(16);
            var mapping = (int)packet.ReadBits(8);

            if (mode.WindowType != 0 || mode.TransformType != 0 || mapping >= vorbis.Maps.Length) throw new InvalidDataException();

            mode.Mapping = vorbis.Maps[mapping];
            mode.BlockSize = mode.BlockFlag ? vorbis.Block1Size : vorbis.Block0Size;

            // now pre-calc the window(s)...
            if (mode.BlockFlag)
            {
                // long block
                mode._windows = new float[4][];
                mode._windows[0] = new float[vorbis.Block1Size];
                mode._windows[1] = new float[vorbis.Block1Size];
                mode._windows[2] = new float[vorbis.Block1Size];
                mode._windows[3] = new float[vorbis.Block1Size];
            }
            else
            {
                // short block
                mode._windows = new float[1][];
                mode._windows[0] = new float[vorbis.Block0Size];
            }
            mode.CalcWindows();

            return mode;
        }
コード例 #2
0
        internal static VorbisMode Init(VorbisStreamDecoder vorbis, DataPacket packet)
        {
            var mode = new VorbisMode(vorbis);

            mode.BlockFlag     = packet.ReadBit();
            mode.WindowType    = (int)packet.ReadBits(16);
            mode.TransformType = (int)packet.ReadBits(16);
            var mapping = (int)packet.ReadBits(8);

            if (mode.WindowType != 0 || mode.TransformType != 0 || mapping >= vorbis.Maps.Length)
            {
                throw new InvalidDataException();
            }

            mode.Mapping   = vorbis.Maps[mapping];
            mode.BlockSize = mode.BlockFlag ? vorbis.Block1Size : vorbis.Block0Size;

            // now pre-calc the window(s)...
            if (mode.BlockFlag)
            {
                // long block
                mode._windows    = new float[4][];
                mode._windows[0] = new float[vorbis.Block1Size];
                mode._windows[1] = new float[vorbis.Block1Size];
                mode._windows[2] = new float[vorbis.Block1Size];
                mode._windows[3] = new float[vorbis.Block1Size];
            }
            else
            {
                // short block
                mode._windows    = new float[1][];
                mode._windows[0] = new float[vorbis.Block0Size];
            }
            mode.CalcWindows();

            return(mode);
        }
コード例 #3
0
        bool UnpackPacket(DataPacket packet)
        {
            // make sure we're on an audio packet
            if (packet.ReadBit())
            {
                // we really can't do anything... count the bits as waste
                return(false);
            }

            // get mode and prev/next flags
            var modeBits = _modeFieldBits;

            _mode = Modes[(int)packet.ReadBits(_modeFieldBits)];
            if (_mode.BlockFlag)
            {
                _prevFlag = packet.ReadBit();
                _nextFlag = packet.ReadBit();
                modeBits += 2;
            }
            else
            {
                _prevFlag = _nextFlag = false;
            }

            if (packet.IsShort)
            {
                return(false);
            }

            var startBits = packet.BitsRead;

            var halfBlockSize = _mode.BlockSize / 2;

            // read the noise floor data (but don't decode yet)
            for (int i = 0; i < _channels; i++)
            {
                _floorData[i]        = _mode.Mapping.ChannelSubmap[i].Floor.UnpackPacket(packet, _mode.BlockSize, i);
                _noExecuteChannel[i] = !_floorData[i].ExecuteChannel;

                // go ahead and clear the residue buffers
                Array.Clear(_residue[i], 0, halfBlockSize);
            }

            // make sure we handle no-energy channels correctly given the couplings...
            foreach (var step in _mode.Mapping.CouplingSteps)
            {
                if (_floorData[step.Angle].ExecuteChannel || _floorData[step.Magnitude].ExecuteChannel)
                {
                    _floorData[step.Angle].ForceEnergy     = true;
                    _floorData[step.Magnitude].ForceEnergy = true;
                }
            }

            var floorBits = packet.BitsRead - startBits;

            startBits = packet.BitsRead;

            foreach (var subMap in _mode.Mapping.Submaps)
            {
                for (int j = 0; j < _channels; j++)
                {
                    if (_mode.Mapping.ChannelSubmap[j] != subMap)
                    {
                        _floorData[j].ForceNoEnergy = true;
                    }
                }

                var rTemp = subMap.Residue.Decode(packet, _noExecuteChannel, _channels, _mode.BlockSize);
                for (int c = 0; c < _channels; c++)
                {
                    var r  = _residue[c];
                    var rt = rTemp[c];
                    for (int i = 0; i < halfBlockSize; i++)
                    {
                        r[i] += rt[i];
                    }
                }
            }

            _glueBits  += 1;
            _modeBits  += modeBits;
            _floorBits += floorBits;
            _resBits   += packet.BitsRead - startBits;
            _wasteBits += 8 * packet.Length - packet.BitsRead;

            _packetCount += 1;

            return(true);
        }
コード例 #4
0
        bool UnpackPacket(DataPacket packet)
        {
            // make sure we're on an audio packet
            if (packet.ReadBit())
            {
                // we really can't do anything... count the bits as waste
                return false;
            }

            // get mode and prev/next flags
            var modeBits = _modeFieldBits;
            _mode = Modes[(int)packet.ReadBits(_modeFieldBits)];
            if (_mode.BlockFlag)
            {
                _prevFlag = packet.ReadBit();
                _nextFlag = packet.ReadBit();
                modeBits += 2;
            }
            else
            {
                _prevFlag = _nextFlag = false;
            }

            if (packet.IsShort) return false;

            var startBits = packet.BitsRead;

            var halfBlockSize = _mode.BlockSize / 2;

            // read the noise floor data (but don't decode yet)
            for (int i = 0; i < _channels; i++)
            {
                _floorData[i] = _mode.Mapping.ChannelSubmap[i].Floor.UnpackPacket(packet, _mode.BlockSize, i);
                _noExecuteChannel[i] = !_floorData[i].ExecuteChannel;

                // go ahead and clear the residue buffers
                Array.Clear(_residue[i], 0, halfBlockSize);
            }

            // make sure we handle no-energy channels correctly given the couplings...
            foreach (var step in _mode.Mapping.CouplingSteps)
            {
                if (_floorData[step.Angle].ExecuteChannel || _floorData[step.Magnitude].ExecuteChannel)
                {
                    _floorData[step.Angle].ForceEnergy = true;
                    _floorData[step.Magnitude].ForceEnergy = true;
                }
            }

            var floorBits = packet.BitsRead - startBits;
            startBits = packet.BitsRead;

            foreach (var subMap in _mode.Mapping.Submaps)
            {
                for (int j = 0; j < _channels; j++)
                {
                    if (_mode.Mapping.ChannelSubmap[j] != subMap)
                    {
                        _floorData[j].ForceNoEnergy = true;
                    }
                }

                var rTemp = subMap.Residue.Decode(packet, _noExecuteChannel, _channels, _mode.BlockSize);
                for (int c = 0; c < _channels; c++)
                {
                    var r = _residue[c];
                    var rt = rTemp[c];
                    for (int i = 0; i < halfBlockSize; i++)
                    {
                        r[i] += rt[i];
                    }
                }
            }

            _glueBits += 1;
            _modeBits += modeBits;
            _floorBits += floorBits;
            _resBits += packet.BitsRead - startBits;
            _wasteBits += 8 * packet.Length - packet.BitsRead;

            _packetCount += 1;

            return true;
        }
コード例 #5
0
        bool LoadBooks(DataPacket packet)
        {
            if (!packet.ReadBytes(7).SequenceEqual(new byte[] { 0x05, 0x76, 0x6f, 0x72, 0x62, 0x69, 0x73 }))
            {
                return(false);
            }

            if (!_pagesSeen.Contains((_lastPageSeen = packet.PageSequenceNumber)))
            {
                _pagesSeen.Add(_lastPageSeen);
            }

            var bits = packet.BitsRead;

            _glueBits += packet.BitsRead;

            // get books
            Books = new VorbisCodebook[packet.ReadByte() + 1];
            for (int i = 0; i < Books.Length; i++)
            {
                Books[i] = VorbisCodebook.Init(this, packet, i);
            }

            _bookBits += packet.BitsRead - bits;
            bits       = packet.BitsRead;

            // get times
            Times = new VorbisTime[(int)packet.ReadBits(6) + 1];
            for (int i = 0; i < Times.Length; i++)
            {
                Times[i] = VorbisTime.Init(this, packet);
            }

            _timeHdrBits += packet.BitsRead - bits;
            bits          = packet.BitsRead;

            // get floor
            Floors = new VorbisFloor[(int)packet.ReadBits(6) + 1];
            for (int i = 0; i < Floors.Length; i++)
            {
                Floors[i] = VorbisFloor.Init(this, packet);
            }

            _floorHdrBits += packet.BitsRead - bits;
            bits           = packet.BitsRead;

            // get residue
            Residues = new VorbisResidue[(int)packet.ReadBits(6) + 1];
            for (int i = 0; i < Residues.Length; i++)
            {
                Residues[i] = VorbisResidue.Init(this, packet);
            }

            _resHdrBits += packet.BitsRead - bits;
            bits         = packet.BitsRead;

            // get map
            Maps = new VorbisMapping[(int)packet.ReadBits(6) + 1];
            for (int i = 0; i < Maps.Length; i++)
            {
                Maps[i] = VorbisMapping.Init(this, packet);
            }

            _mapHdrBits += packet.BitsRead - bits;
            bits         = packet.BitsRead;

            // get mode settings
            Modes = new VorbisMode[(int)packet.ReadBits(6) + 1];
            for (int i = 0; i < Modes.Length; i++)
            {
                Modes[i] = VorbisMode.Init(this, packet);
            }

            _modeHdrBits += packet.BitsRead - bits;

            // check the framing bit
            if (!packet.ReadBit())
            {
                throw new InvalidDataException();
            }

            ++_glueBits;

            _wasteHdrBits += 8 * packet.Length - packet.BitsRead;

            _modeFieldBits = Utils.ilog(Modes.Length - 1);

            return(true);
        }