// The Vorbis header is in three packets; the initial small packet in
// the first page that identifies basic parameters, a second packet
// with bitstream comments and a third packet that holds the
// codebook.
public int SynthesisHeaderIn(Comment Comment, Packet Packet)
{
var Buffer = new NVorbis.Ogg.BBuffer();
if (Packet != null)
{
Buffer.ReadInit(Packet.packet_base, Packet.packet, Packet.bytes);
// Which of the three types of header is this?
// Also verify header-ness, vorbis
{
byte[] buffer = new byte[6];
int packtype = Buffer.Read(8);
Buffer.Read(buffer, 6);
if (buffer[0] != 'v' || buffer[1] != 'o' || buffer[2] != 'r' || buffer[3] != 'b' ||
buffer[4] != 'i' || buffer[5] != 's')
{
// not a vorbis header
return(-1);
}
switch (packtype)
{
case 0x01: // least significant *bit* is read first
if (Packet.b_o_s == 0)
{
// Not the initial packet
return(-1);
}
if (Rate != 0)
{
// previously initialized info header
return(-1);
}
return(UnpackInfo(Buffer));
case 0x03: // least significant *bit* is read first
if (Rate == 0)
{
// um... we didn't get the initial header
return(-1);
}
return(Comment.unpack(Buffer));
case 0x05: // least significant *bit* is read first
if (Rate == 0 || Comment.vendor == null)
{
// um... we didn;t get the initial header or comments yet
return(-1);
}
return(UnpackBooks(Buffer));
default:
// Not a valid vorbis header type
//return(-1);
break;
}
}
}
return(-1);
}
public int BlockSize(Packet Packet)
{
//codec_setup_info
var Buffer = new NVorbis.Ogg.BBuffer();
int mode;
Buffer.ReadInit(Packet.packet_base, Packet.packet, Packet.bytes);
/* Check the packet type */
if (Buffer.Read(1) != 0)
{
/* Oops. This is not an audio data packet */
return(OV_ENOTAUDIO);
}
{
int modebits = 0;
uint v = (uint)Modes;
while (v > 1)
{
modebits++;
v >>= 1;
}
/* read our mode and pre/post windowsize */
mode = Buffer.Read(modebits);
}
if (mode == -1)
{
return(OV_EBADPACKET);
}
return(blocksizes[ModeParam[mode].blockflag]);
}
/// <summary>
/// Header packing/unpacking
/// </summary>
/// <param name="Buffer"></param>
/// <returns></returns>
int UnpackInfo(NVorbis.Ogg.BBuffer Buffer)
{
version = Buffer.Read(32);
if (version != 0)
{
return(-1);
}
Channels = Buffer.Read(8);
Rate = Buffer.Read(32);
bitrate_upper = Buffer.Read(32);
bitrate_nominal = Buffer.Read(32);
bitrate_lower = Buffer.Read(32);
blocksizes[0] = 1 << Buffer.Read(4);
blocksizes[1] = 1 << Buffer.Read(4);
if ((Rate < 1) || (Channels < 1) || (blocksizes[0] < 8) || (blocksizes[1] < blocksizes[0]) ||
(Buffer.Read(1) != 1))
{
Clear();
return(-1);
}
return(0);
}
/// <summary>
/// All of the real encoding details are here. The modes, books, everything.
/// </summary>
/// <param name="Buffer"></param>
/// <returns></returns>
int UnpackBooks(NVorbis.Ogg.BBuffer Buffer)
{
Books = Buffer.Read(8) + 1;
if (BookParam == null || BookParam.Length != Books)
{
BookParam = new StaticCodeBook[Books];
}
for (int i = 0; i < Books; i++)
{
BookParam[i] = new StaticCodeBook();
if (BookParam[i].unpack(Buffer) != 0)
{
Clear();
return(-1);
}
}
// time backend settings
Times = Buffer.Read(6) + 1;
if (TimeType == null || TimeType.Length != Times)
{
TimeType = new int[Times];
}
if (TimeParam == null || TimeParam.Length != Times)
{
TimeParam = new Object[Times];
}
for (int i = 0; i < Times; i++)
{
TimeType[i] = Buffer.Read(16);
if (TimeType[i] < 0 || TimeType[i] >= VI_TIMEB)
{
Clear();
return(-1);
}
TimeParam[i] = FuncTime.time_P[TimeType[i]].unpack(this, Buffer);
if (TimeParam[i] == null)
{
Clear();
return(-1);
}
}
// floor backend settings
floors = Buffer.Read(6) + 1;
if (FloorType == null || FloorType.Length != floors)
{
FloorType = new int[floors];
}
if (FloorParam == null || FloorParam.Length != floors)
{
FloorParam = new Object[floors];
}
for (int i = 0; i < floors; i++)
{
FloorType[i] = Buffer.Read(16);
if (FloorType[i] < 0 || FloorType[i] >= VI_FLOORB)
{
Clear();
return(-1);
}
FloorParam[i] = FuncFloor.floor_P[FloorType[i]].unpack(this, Buffer);
if (FloorParam[i] == null)
{
Clear();
return(-1);
}
}
// residue backend settings
residues = Buffer.Read(6) + 1;
if (residue_type == null || residue_type.Length != residues)
{
residue_type = new int[residues];
}
if (ResidueParam == null || ResidueParam.Length != residues)
{
ResidueParam = new Object[residues];
}
for (int i = 0; i < residues; i++)
{
residue_type[i] = Buffer.Read(16);
if (residue_type[i] < 0 || residue_type[i] >= VI_RESB)
{
Clear();
return(-1);
}
ResidueParam[i] = FuncResidue.residue_P[residue_type[i]].unpack(this, Buffer);
if (ResidueParam[i] == null)
{
Clear();
return(-1);
}
}
// map backend settings
maps = Buffer.Read(6) + 1;
if (map_type == null || map_type.Length != maps)
{
map_type = new int[maps];
}
if (MapParam == null || MapParam.Length != maps)
{
MapParam = new Object[maps];
}
for (int i = 0; i < maps; i++)
{
map_type[i] = Buffer.Read(16);
if (map_type[i] < 0 || map_type[i] >= VI_MAPB)
{
Clear();
return(-1);
}
MapParam[i] = FuncMapping.mapping_P[map_type[i]].unpack(this, Buffer);
if (MapParam[i] == null)
{
Clear();
return(-1);
}
}
// mode settings
Modes = Buffer.Read(6) + 1;
if (ModeParam == null || ModeParam.Length != Modes)
{
ModeParam = new InfoMode[Modes];
}
for (int i = 0; i < Modes; i++)
{
ModeParam[i] = new InfoMode();
ModeParam[i].blockflag = Buffer.Read(1);
ModeParam[i].windowtype = Buffer.Read(16);
ModeParam[i].transformtype = Buffer.Read(16);
ModeParam[i].mapping = Buffer.Read(8);
if ((ModeParam[i].windowtype >= VI_WINDOWB) ||
(ModeParam[i].transformtype >= VI_WINDOWB) ||
(ModeParam[i].mapping >= maps))
{
Clear();
return(-1);
}
}
if (Buffer.Read(1) != 1)
{
Clear();
return(-1);
}
return(0);
}
public int synthesis(Packet op)
{
Info vi = vd.vi;
// first things first. Make sure decode is ready
opb.ReadInit(op.packet_base, op.packet, op.bytes);
// Check the packet type
if (opb.Read(1) != 0)
{
// Oops. This is not an audio data packet
return(-1);
}
// read our mode and pre/post windowsize
int _mode = opb.Read(vd.modebits);
if (_mode == -1)
{
return(-1);
}
mode = _mode;
W = vi.ModeParam[mode].blockflag;
if (W != 0)
{
lW = opb.Read(1);
nW = opb.Read(1);
if (nW == -1)
{
return(-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
int type = vi.map_type[vi.ModeParam[mode].mapping];
return(FuncMapping.mapping_P[type].inverse(this, vd.mode[mode]));
}
// The Vorbis header is in three packets; the initial small packet in
// the first page that identifies basic parameters, a second packet
// with bitstream comments and a third packet that holds the
// codebook.
public int SynthesisHeaderIn(Comment Comment, Packet Packet)
{
var Buffer = new NVorbis.Ogg.BBuffer();
if (Packet != null)
{
Buffer.ReadInit(Packet.packet_base, Packet.packet, Packet.bytes);
// Which of the three types of header is this?
// Also verify header-ness, vorbis
{
byte[] buffer = new byte[6];
int packtype = Buffer.Read(8);
Buffer.Read(buffer, 6);
if (buffer[0] != 'v' || buffer[1] != 'o' || buffer[2] != 'r' || buffer[3] != 'b'
|| buffer[4] != 'i' || buffer[5] != 's')
{
// not a vorbis header
return (-1);
}
switch (packtype)
{
case 0x01: // least significant *bit* is read first
if (Packet.b_o_s == 0)
{
// Not the initial packet
return (-1);
}
if (Rate != 0)
{
// previously initialized info header
return (-1);
}
return (UnpackInfo(Buffer));
case 0x03: // least significant *bit* is read first
if (Rate == 0)
{
// um... we didn't get the initial header
return (-1);
}
return (Comment.unpack(Buffer));
case 0x05: // least significant *bit* is read first
if (Rate == 0 || Comment.vendor == null)
{
// um... we didn;t get the initial header or comments yet
return (-1);
}
return (UnpackBooks(Buffer));
default:
// Not a valid vorbis header type
//return(-1);
break;
}
}
}
return (-1);
}
public int BlockSize(Packet Packet)
{
//codec_setup_info
var Buffer = new NVorbis.Ogg.BBuffer();
int mode;
Buffer.ReadInit(Packet.packet_base, Packet.packet, Packet.bytes);
/* Check the packet type */
if (Buffer.Read(1) != 0)
{
/* Oops. This is not an audio data packet */
return (OV_ENOTAUDIO);
}
{
int modebits = 0;
uint v = (uint)Modes;
while (v > 1)
{
modebits++;
v >>= 1;
}
/* read our mode and pre/post windowsize */
mode = Buffer.Read(modebits);
}
if (mode == -1)
return (OV_EBADPACKET);
return (blocksizes[ModeParam[mode].blockflag]);
}