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]);
}
// 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);
}
// 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 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]));
}
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]);
}