// 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 synthesis_headerin(Comment vc, Packet op)
{
csBuffer opb=new csBuffer();
if(op!=null)
{
opb.ReadInitialize(op.packet_base, op.packet, op.bytes);
// Which of the three types of header is this?
// Also verify header-ness, vorbis
{
byte[] buffer=new byte[6];
int packtype=opb.Read(8);
//memset(buffer,0,6);
opb.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(op.b_o_s==0)
{
// Not the initial packet
return(-1);
}
if(rate!=0)
{
// previously initialized info header
return(-1);
}
return(unpack_info(opb));
case 0x03: // least significant *bit* is read first
if(rate==0)
{
// um... we didn't get the initial header
return(-1);
}
return(vc.unpack(opb));
case 0x05: // least significant *bit* is read first
if(rate==0 || vc.vendor==null)
{
// um... we didn;t get the initial header or comments yet
return(-1);
}
return(unpack_books(opb));
default:
// Not a valid vorbis header type
//return(-1);
break;
}
}
}
return(-1);
}
// static void v_writestring(csBuffer o, byte[] s){
// int i=0;
// while(s[i]!=0){
// o.write(s[i++],8);
// }
// }
// static void v_readstring(csBuffer o, byte[] buf, int bytes){
// int i=0
// while(bytes--!=0){
// buf[i++]=o.read(8);
// }
// }
// private csBuffer opb_blocksize=new csBuffer();
public int blocksize(Packet op)
{
//codec_setup_info *ci=vi->codec_setup;
csBuffer opb=new csBuffer();
// synchronized(opb_blocksize){
int mode;
opb.ReadInitialize(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(OV_ENOTAUDIO);
}
{
int modebits=0;
int v=modes;
while(v>1)
{
modebits++;
v = (int)((uint)v >> 1);
}
/* read our mode and pre/post windowsize */
mode=opb.Read(modebits);
}
if(mode==-1)return(OV_EBADPACKET);
return(blocksizes[mode_param[mode].blockflag]);
// }
}
