// add the incoming page to the stream state; we decompose the page
// into packet segments here as well.
public int pagein(Page og)
{
byte[] header_base=og.header_base;
int header=og.header;
byte[] body_base=og.body_base;
int body=og.body;
int bodysize=og.body_len;
int segptr=0;
int version=og.version();
int continued=og.continued();
int bos=og.bos();
int eos=og.eos();
long granulepos=og.granulepos();
int _serialno=og.serialno();
int _pageno=og.pageno();
int segments=header_base[header+26]&0xff;
// clean up 'returned data'
{
int lr=lacing_returned;
int br=body_returned;
// body data
//System.out.println("br="+br+", body_fill="+body_fill);
if(br!=0)
{
body_fill-=br;
if(body_fill!=0)
{
Array.Copy(body_data, br, body_data, 0, body_fill);
}
body_returned=0;
}
//System.out.println("?? br="+br+", body_fill="+body_fill+" body_returned="+body_returned);
if(lr!=0)
{
// segment table
if((lacing_fill-lr)!=0)
{
Array.Copy(lacing_vals, lr, lacing_vals, 0, lacing_fill-lr);
Array.Copy(granule_vals, lr, granule_vals, 0, lacing_fill-lr);
}
lacing_fill-=lr;
lacing_packet-=lr;
lacing_returned=0;
}
}
// check the serial number
if(_serialno!=serialno)return(-1);
if(version>0)return(-1);
lacing_expand(segments+1);
// are we in sequence?
if(_pageno!=pageno)
{
int i;
// unroll previous partial packet (if any)
for(i=lacing_packet;i<lacing_fill;i++)
{
body_fill-=lacing_vals[i]&0xff;
//System.out.println("??");
}
lacing_fill=lacing_packet;
// make a note of dropped data in segment table
if(pageno!=-1)
{
lacing_vals[lacing_fill++]=0x400;
lacing_packet++;
}
// are we a 'continued packet' page? If so, we'll need to skip
// some segments
if(continued!=0)
{
bos=0;
for(;segptr<segments;segptr++)
{
int val=(header_base[header+27+segptr]&0xff);
body+=val;
bodysize-=val;
if(val<255)
{
segptr++;
break;
}
}
}
}
//System.out.println("bodysize="+bodysize);
if(bodysize!=0)
{
body_expand(bodysize);
Array.Copy(body_base, body, body_data, body_fill, bodysize);
body_fill+=bodysize;
}
//System.out.println("bodyfill="+body_fill);
{
int saved=-1;
while(segptr<segments)
{
int val=(header_base[header+27+segptr]&0xff);
lacing_vals[lacing_fill]=val;
granule_vals[lacing_fill]=-1;
if(bos!=0)
{
lacing_vals[lacing_fill]|=0x100;
bos=0;
}
if(val<255)saved=lacing_fill;
lacing_fill++;
segptr++;
if(val<255)lacing_packet=lacing_fill;
}
/* set the granulepos on the last pcmval of the last full packet */
if(saved!=-1)
{
granule_vals[saved]=granulepos;
}
}
if(eos!=0)
{
e_o_s=1;
if(lacing_fill>0)
lacing_vals[lacing_fill-1]|=0x200;
}
pageno=_pageno+1;
return(0);
}
// add the incoming page to the stream state; we decompose the page
// into packet segments here as well.
public int pagein(Page og)
{
byte[] header_base = og.header_base;
int header = og.header;
byte[] body_base = og.body_base;
int body = og.body;
int bodysize = og.body_len;
int segptr = 0;
int version = og.version();
int continued = og.continued();
int bos = og.bos();
int eos = og.eos();
long granulepos = og.granulepos();
int _serialno = og.serialno();
int _pageno = og.pageno();
int segments = header_base[header + 26] & 0xff;
// clean up 'returned data'
{
int lr = lacing_returned;
int br = body_returned;
// body data
//System.out.println("br="+br+", body_fill="+body_fill);
if (br != 0)
{
body_fill -= br;
if (body_fill != 0)
{
Array.Copy(body_data, br, body_data, 0, body_fill);
}
body_returned = 0;
}
//System.out.println("?? br="+br+", body_fill="+body_fill+" body_returned="+body_returned);
if (lr != 0)
{
// segment table
if ((lacing_fill - lr) != 0)
{
Array.Copy(lacing_vals, lr, lacing_vals, 0, lacing_fill - lr);
Array.Copy(granule_vals, lr, granule_vals, 0, lacing_fill - lr);
}
lacing_fill -= lr;
lacing_packet -= lr;
lacing_returned = 0;
}
}
// check the serial number
if (_serialno != serialno)
{
return(-1);
}
if (version > 0)
{
return(-1);
}
lacing_expand(segments + 1);
// are we in sequence?
if (_pageno != pageno)
{
int i;
// unroll previous partial packet (if any)
for (i = lacing_packet; i < lacing_fill; i++)
{
body_fill -= lacing_vals[i] & 0xff;
//System.out.println("??");
}
lacing_fill = lacing_packet;
// make a note of dropped data in segment table
if (pageno != -1)
{
lacing_vals[lacing_fill++] = 0x400;
lacing_packet++;
}
// are we a 'continued packet' page? If so, we'll need to skip
// some segments
if (continued != 0)
{
bos = 0;
for (; segptr < segments; segptr++)
{
int val = (header_base[header + 27 + segptr] & 0xff);
body += val;
bodysize -= val;
if (val < 255)
{
segptr++;
break;
}
}
}
}
//System.out.println("bodysize="+bodysize);
if (bodysize != 0)
{
body_expand(bodysize);
Array.Copy(body_base, body, body_data, body_fill, bodysize);
body_fill += bodysize;
}
//System.out.println("bodyfill="+body_fill);
{
int saved = -1;
while (segptr < segments)
{
int val = (header_base[header + 27 + segptr] & 0xff);
lacing_vals[lacing_fill] = val;
granule_vals[lacing_fill] = -1;
if (bos != 0)
{
lacing_vals[lacing_fill] |= 0x100;
bos = 0;
}
if (val < 255)
{
saved = lacing_fill;
}
lacing_fill++;
segptr++;
if (val < 255)
{
lacing_packet = lacing_fill;
}
}
/* set the granulepos on the last pcmval of the last full packet */
if (saved != -1)
{
granule_vals[saved] = granulepos;
}
}
if (eos != 0)
{
e_o_s = 1;
if (lacing_fill > 0)
{
lacing_vals[lacing_fill - 1] |= 0x200;
}
}
pageno = _pageno + 1;
return(0);
}
/// <summary>
/// Enumerates PCM chunks
/// </summary>
/// <returns>Enumerator</returns>
public IEnumerator <PCMChunk> GetEnumerator()
{
int bytesRead = 0;
while (eos == 0)
{
while (eos == 0)
{
int result = oy.pageout(og);
if (result == 0)
{
break;
} // need more data
if (result == -1)
{
// missing or corrupt data at this page position
throw new Exception("Corrupt or missing data in bitstream...");
}
else
{
os.pagein(og); // can safely ignore errors at this point
while (true)
{
result = os.packetout(op);
if (result == 0)
{
break;
} // need more data
if (result == -1)
{
// missing or corrupt data at this page position
// no reason to complain; already complained above
}
else
{
// we have a packet. Decode it
int samples;
if (vb.synthesis(op) == 0)
{
// test for success!
vd.synthesis_blockin(vb);
}
// **pcm is a multichannel float vector. In stereo, for
// example, pcm[0] is left, and pcm[1] is right. samples is
// the size of each channel. Convert the float values
// (-1.<=range<=1.) to whatever PCM format and write it out
while ((samples = vd.synthesis_pcmout(_pcm, _index)) > 0)
{
float[][] pcm = _pcm[0];
int bout = (samples < convsize ? samples : convsize);
int chunkSize = 2 * vi.channels * bout;
pcm_offset += samples;
if (bytesRead + chunkSize > convbuffer.Length)
{
PCMChunk chunk = new PCMChunk {
Bytes = convbuffer, Channels = vi.channels, Length = bytesRead, Rate = vi.rate
};
bytesRead = 0;
yield return(chunk);
}
ConvertChunk(bout, bytesRead, pcm);
bytesRead += chunkSize;
vd.synthesis_read(bout); // tell libvorbis how many samples we actually consumed
}
}
}
if (og.eos() != 0)
{
eos = 1;
}
}
}
if (eos == 0)
{
ReadNextPage();
}
}
if (bytesRead != 0)
{
PCMChunk chunk = new PCMChunk {
Bytes = convbuffer, Channels = vi.channels, Length = bytesRead, Rate = vi.rate
};
yield return(chunk);
}
else
{
yield break;
}
}
