// last step of the OggVorbis_File initialization; get all the
// vorbis_info structs and PCM positions. Only called by the seekable
// initialization (local stream storage is hacked slightly; pay
// attention to how that's done)
public void prefetch_all_headers(Info first_i,Comment first_c, int dataoffset,
VorbisFileInstance instance)
{
Page og=new Page();
int ret;
vi=new Info[links];
vc=new Comment[links];
dataoffsets=new long[links];
pcmlengths=new long[links];
serialnos=new int[links];
for(int i=0;i<links;i++)
{
if(first_i!=null && first_c!=null && i==0)
{
// we already grabbed the initial header earlier. This just
// saves the waste of grabbing it again
// !!!!!!!!!!!!!
vi[i]=first_i;
//memcpy(vf->vi+i,first_i,sizeof(vorbis_info));
vc[i]=first_c;
//memcpy(vf->vc+i,first_c,sizeof(vorbis_comment));
dataoffsets[i]=dataoffset;
}
else
{
// seek to the location of the initial header
seek_helper(offsets[i], instance); //!!!
if (fetch_headers(vi[i], vc[i], null, null, instance) == -1)
{
Console.Error.WriteLine("Error opening logical bitstream #"+(i+1)+"\n");
dataoffsets[i]=-1;
}
else
{
dataoffsets[i]=offset;
instance.os.clear();
}
}
// get the serial number and PCM length of this link. To do this,
// get the last page of the stream
long end=offsets[i+1]; //!!!
seek_helper(end, instance);
while(true)
{
ret=get_prev_page(og, instance);
if(ret==-1)
{
// this should not be possible
Console.Error.WriteLine("Could not find last page of logical "+
"bitstream #"+(i)+"\n");
vi[i].clear();
vc[i].clear();
break;
}
if(og.granulepos()!=-1)
{
serialnos[i]=og.serialno();
pcmlengths[i]=og.granulepos();
break;
}
}
}
}
int open_seekable()
{
VorbisFileInstance instance = makeInstance();
Info initial_i=new Info();
Comment initial_c=new Comment();
int serialno;
long end;
int ret;
int dataoffset;
Page og=new Page();
// is this even vorbis...?
int[] foo=new int[1];
ret = fetch_headers(initial_i, initial_c, foo, null, instance);
serialno=foo[0];
dataoffset=(int)offset; //!!
instance.os.clear();
if(ret==-1)return(-1);
// we can seek, so set out learning all about this file
skable=true;
//(callbacks.seek_func)(datasource, 0, SEEK_END);
fseek(datasource, 0, SEEK_END);
//offset=end=(callbacks.tell_func)(datasource);
offset=ftell(datasource);
end=offset;
// We get the offset for the last page of the physical bitstream.
// Most OggVorbis files will contain a single logical bitstream
end=get_prev_page(og, instance);
// moer than one logical bitstream?
if(og.serialno()!=serialno)
{
// Chained bitstream. Bisect-search each logical bitstream
// section. Do so based on serial number only
if(bisect_forward_serialno(0,0,end+1,serialno,0, instance)<0)
{
clear();
return OV_EREAD;
}
}
else
{
// Only one logical bitstream
if(bisect_forward_serialno(0,end,end+1,serialno,0, instance)<0)
{
clear();
return OV_EREAD;
}
}
prefetch_all_headers(initial_i, initial_c, dataoffset, instance);
//return(raw_seek(0));
return 0;
}
int open_nonseekable()
{
//System.err.println("open_nonseekable");
// we cannot seek. Set up a 'single' (current) logical bitstream entry
links=1;
vi=new Info[links]; vi[0]=new Info(); // ??
vc=new Comment[links]; vc[0]=new Comment(); // ?? bug?
// Try to fetch the headers, maintaining all the storage
int[]foo=new int[1];
if(fetch_headers(vi[0], vc[0], foo, null)==-1)return(-1);
current_serialno=foo[0];
make_decode_ready();
return 0;
}
// uses the local ogg_stream storage in vf; this is important for
// non-streaming input sources
public int fetch_headers(Info vi, Comment vc, int[] serialno, Page og_ptr, VorbisFileInstance instance)
{
//System.err.println("fetch_headers");
Page og=new Page();
Packet op=new Packet();
int ret;
if(og_ptr==null)
{
ret = get_next_page(og, CHUNKSIZE, instance);
if(ret==OV_EREAD)return OV_EREAD;
if(ret<0) return OV_ENOTVORBIS;
og_ptr=og;
}
if(serialno!=null)serialno[0]=og_ptr.serialno();
instance.os.init(og_ptr.serialno());
// extract the initial header from the first page and verify that the
// Ogg bitstream is in fact Vorbis data
vi.init();
vc.init();
int i=0;
while(i<3)
{
instance.os.pagein(og_ptr);
while(i<3)
{
int result = instance.os.packetout(op);
if(result==0)break;
if(result==-1)
{
Console.Error.WriteLine("Corrupt header in logical bitstream.");
//goto bail_header;
vi.clear();
vc.clear();
instance.os.clear();
return -1;
}
if(vi.synthesis_headerin(vc, op)!=0)
{
Console.Error.WriteLine("Illegal header in logical bitstream.");
//goto bail_header;
vi.clear();
vc.clear();
instance.os.clear();
return -1;
}
i++;
}
if(i<3)
if(get_next_page(og_ptr, 1, instance)<0)
{
Console.Error.WriteLine("Missing header in logical bitstream.");
//goto bail_header;
vi.clear();
vc.clear();
instance.os.clear();
return -1;
}
}
return 0;
}
/// <summary>
/// Decodes a stream of Ogg Vorbis data into wav file format.
/// </summary>
/// <returns>
/// A MemoryStream with the entire decoded stream.
/// </returns>
/// <param name='input'>
/// Ogg Vorbis data to be decoded
/// </param>
/// <param name='output'>
/// <para>Stream to write wav data.</para>
/// <para>If writeWavHeader is true then this stream must be seekable.</para>
/// </param>
/// <param name='writeWavHeader'>
/// Write wav header in the beginning of the returned stream.
/// </param>
public static void DecodeStream(Stream input, Stream output, bool writeWavHeader)
{
int convsize = 4096 * 2;
byte[] convbuffer = new byte[convsize]; // take 8k out of the data segment, not the stack
long start = output.Position;
DebugWriter s_err = new DebugWriter();
if (writeWavHeader && !output.CanSeek)
throw new ArgumentException("To write wav header, the output stream must be seekable.", "output");
if (writeWavHeader)
output.Seek(HEADER_SIZE, SeekOrigin.Current); // reserve place for WAV header
SyncState oy = new SyncState(); // sync and verify incoming physical bitstream
StreamState os = new StreamState(); // take physical pages, weld into a logical stream of packets
Page og = new Page(); // one Ogg bitstream page. Vorbis packets are inside
Packet op = new Packet(); // one raw packet of data for decode
Info vi = new Info(); // struct that stores all the static vorbis bitstream settings
Comment vc = new Comment(); // struct that stores all the bitstream user comments
DspState vd = new DspState(); // central working state for the packet->PCM decoder
Block vb = new Block(vd); // local working space for packet->PCM decode
int bytes = 0;
// Decode setup
oy.init(); // Now we can read pages
// we repeat if the bitstream is chained
while (true)
{
int eos = 0;
// grab some data at the head of the stream. We want the first page
// (which is guaranteed to be small and only contain the Vorbis
// stream initial header) We need the first page to get the stream
// serialno.
// submit a 4k block to libvorbis' Ogg layer
int index = oy.buffer(4096);
bytes = input.Read(oy.data, index, 4096);
oy.wrote(bytes);
// Get the first page.
if (oy.pageout(og) != 1)
{
// have we simply run out of data? If so, we're done.
if (bytes < 4096)
break;
// error case. Must not be Vorbis data
s_err.WriteLine("Input does not appear to be an Ogg bitstream.");
}
// Get the serial number and set up the rest of decode.
// serialno first; use it to set up a logical stream
os.init(og.serialno());
// extract the initial header from the first page and verify that the
// Ogg bitstream is in fact Vorbis data
// I handle the initial header first instead of just having the code
// read all three Vorbis headers at once because reading the initial
// header is an easy way to identify a Vorbis bitstream and it's
// useful to see that functionality seperated out.
vi.init();
vc.init();
if (os.pagein(og) < 0)
{
// error; stream version mismatch perhaps
s_err.WriteLine("Error reading first page of Ogg bitstream data.");
}
if (os.packetout(op) != 1)
{
// no page? must not be vorbis
s_err.WriteLine("Error reading initial header packet.");
}
if (vi.synthesis_headerin(vc, op) < 0)
{
// error case; not a vorbis header
s_err.WriteLine("This Ogg bitstream does not contain Vorbis audio data.");
}
// At this point, we're sure we're Vorbis. We've set up the logical
// (Ogg) bitstream decoder. Get the comment and codebook headers and
// set up the Vorbis decoder
// The next two packets in order are the comment and codebook headers.
// They're likely large and may span multiple pages. Thus we reead
// and submit data until we get our two pacakets, watching that no
// pages are missing. If a page is missing, error out; losing a
// header page is the only place where missing data is fatal. */
int i = 0;
while (i < 2)
{
while (i < 2)
{
int result = oy.pageout(og);
if (result == 0)
break; // Need more data
// Don't complain about missing or corrupt data yet. We'll
// catch it at the packet output phase
if (result == 1)
{
os.pagein(og); // we can ignore any errors here
// as they'll also become apparent
// at packetout
while (i < 2)
{
result = os.packetout(op);
if (result == 0)
break;
if (result == -1)
{
// Uh oh; data at some point was corrupted or missing!
// We can't tolerate that in a header. Die.
s_err.WriteLine("Corrupt secondary header. Exiting.");
}
vi.synthesis_headerin(vc, op);
i++;
}
}
}
// no harm in not checking before adding more
index = oy.buffer(4096);
bytes = input.Read(oy.data, index, 4096);
if (bytes == 0 && i < 2)
{
s_err.WriteLine("End of file before finding all Vorbis headers!");
}
oy.wrote(bytes);
}
// Throw the comments plus a few lines about the bitstream we're
// decoding
{
byte[][] ptr = vc.user_comments;
for (int j = 0; j < vc.user_comments.Length; j++)
{
if (ptr [j] == null)
break;
s_err.WriteLine(vc.getComment(j));
}
s_err.WriteLine("\nBitstream is " + vi.channels + " channel, " + vi.rate + "Hz");
s_err.WriteLine("Encoded by: " + vc.getVendor() + "\n");
}
convsize = 4096 / vi.channels;
// OK, got and parsed all three headers. Initialize the Vorbis
// packet->PCM decoder.
vd.synthesis_init(vi); // central decode state
vb.init(vd); // local state for most of the decode
// so multiple block decodes can
// proceed in parallel. We could init
// multiple vorbis_block structures
// for vd here
float[][][] _pcm = new float[1][][];
int[] _index = new int[vi.channels];
// The rest is just a straight decode loop until end of stream
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
s_err.WriteLine("Corrupt or missing data in bitstream; continuing...");
} 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];
bool clipflag = false;
int bout = (samples < convsize ? samples : convsize);
// convert floats to 16 bit signed ints (host order) and
// interleave
for (i = 0; i < vi.channels; i++)
{
int ptr = i * 2;
//int ptr=i;
int mono = _index [i];
for (int j = 0; j < bout; j++)
{
int val = (int)(pcm [i] [mono + j] * 32767.0);
// short val=(short)(pcm[i][mono+j]*32767.);
// int val=(int)Math.round(pcm[i][mono+j]*32767.);
// might as well guard against clipping
if (val > 32767)
{
val = 32767;
clipflag = true;
}
if (val < -32768)
{
val = -32768;
clipflag = true;
}
if (val < 0)
val = val | 0x8000;
convbuffer [ptr] = (byte)(val);
convbuffer [ptr + 1] = (byte)((uint)val >> 8);
ptr += 2 * (vi.channels);
}
}
if (clipflag)
{
//s_err.WriteLine("Clipping in frame "+vd.sequence);
}
output.Write(convbuffer, 0, 2 * vi.channels * bout);
vd.synthesis_read(bout); // tell libvorbis how
// many samples we
// actually consumed
}
}
}
if (og.eos() != 0)
eos = 1;
}
}
if (eos == 0)
{
index = oy.buffer(4096);
bytes = input.Read(oy.data, index, 4096);
oy.wrote(bytes);
if (bytes == 0)
eos = 1;
}
}
// clean up this logical bitstream; before exit we see if we're
// followed by another [chained]
os.clear();
// ogg_page and ogg_packet structs always point to storage in
// libvorbis. They're never freed or manipulated directly
vb.clear();
vd.clear();
vi.clear(); // must be called last
}
// OK, clean up the framer
oy.clear();
s_err.WriteLine("Done.");
if (writeWavHeader)
{
long end = output.Position;
int length = (int)(end - (start + HEADER_SIZE));
output.Seek(start, SeekOrigin.Begin);
WriteHeader(output, length, vi.rate, (ushort)16, (ushort)vi.channels);
output.Seek(end, SeekOrigin.Begin);
}
}
// 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.readinit(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);
}
public AudioSample OggToWav(Stream ogg, float volume, float pitch)
{
AudioSample sample = new AudioSample();
TextWriter s_err = new StringWriter();
Stream input = null;
MemoryStream output = null;
input = ogg;
output = new MemoryStream();
SyncState oy = new SyncState();
StreamState os = new StreamState();
Page og = new Page();
Packet op = new Packet();
Info vi = new Info();
Comment vc = new Comment();
DspState vd = new DspState();
Block vb = new Block(vd);
byte[] buffer;
int bytes = 0;
oy.init();
while (true)
{
int eos = 0;
int index = oy.buffer(4096);
buffer = oy.data;
try
{
bytes = input.Read(buffer, index, 4096);
}
catch (Exception e)
{
s_err.WriteLine(e);
}
oy.wrote(bytes);
if (oy.pageout(og) != 1)
{
if (bytes < 4096) break;
s_err.WriteLine("Input does not appear to be an Ogg bitstream.");
}
os.init(og.serialno());
vi.init();
vc.init();
if (os.pagein(og) < 0)
{
s_err.WriteLine("Error reading first page of Ogg bitstream data.");
}
if (os.packetout(op) != 1)
{
s_err.WriteLine("Error reading initial header packet.");
}
if (vi.synthesis_headerin(vc, op) < 0)
{
s_err.WriteLine("This Ogg bitstream does not contain Vorbis audio data.");
}
int i = 0;
while (i < 2)
{
while (i < 2)
{
int result = oy.pageout(og);
if (result == 0) break;
if (result == 1)
{
os.pagein(og);
while (i < 2)
{
result = os.packetout(op);
if (result == 0) break;
vi.synthesis_headerin(vc, op);
i++;
}
}
}
index = oy.buffer(4096);
buffer = oy.data;
try
{
bytes = input.Read(buffer, index, 4096);
}
catch (Exception e)
{
s_err.WriteLine(e);
}
oy.wrote(bytes);
}
sample.Channels = vi.channels;
sample.Rate = (int)((float)vi.rate * pitch);
convsize = 4096 / vi.channels;
vd.synthesis_init(vi);
vb.init(vd);
float[][][] _pcm = new float[1][][];
int[] _index = new int[vi.channels];
while (eos == 0)
{
while (eos == 0)
{
int result = oy.pageout(og);
if (result == 0) break;
if (result != -1)
{
os.pagein(og);
while (true)
{
result = os.packetout(op);
if (result == 0) break;
if (result != -1)
{
int samples;
if (vb.synthesis(op) == 0)
{
vd.synthesis_blockin(vb);
}
while ((samples = vd.synthesis_pcmout(_pcm, _index)) > 0)
{
float[][] pcm = _pcm[0];
int bout = (samples < convsize ? samples : convsize);
for (i = 0; i < vi.channels; i++)
{
int ptr = i * 2;
int mono = _index[i];
for (int j = 0; j < bout; j++)
{
int val = (int)(pcm[i][mono + j] * 32767.0);
if (val > 32767)
{
val = 32767;
}
if (val < -32768)
{
val = -32768;
}
val = (int)((float)val * volume);
if (val < 0) val = val | 0x8000;
convbuffer[ptr] = (byte)(val);
convbuffer[ptr + 1] = (byte)((uint)val >> 8);
ptr += 2 * (vi.channels);
}
}
output.Write(convbuffer, 0, 2 * vi.channels * bout);
vd.synthesis_read(bout);
}
}
}
if (og.eos() != 0) eos = 1;
}
}
if (eos == 0)
{
index = oy.buffer(4096);
buffer = oy.data;
try
{
bytes = input.Read(buffer, index, 4096);
}
catch (Exception e)
{
s_err.WriteLine(e);
}
oy.wrote(bytes);
if (bytes == 0) eos = 1;
}
}
os.clear();
vb.clear();
vd.clear();
vi.clear();
break;
}
oy.clear();
input.Close();
sample.Pcm = output.ToArray();
return sample;
}
// last step of the OggVorbis_File initialization; get all the
// vorbis_info structs and PCM positions. Only called by the seekable
// initialization (local stream storage is hacked slightly; pay
// attention to how that's done)
void prefetch_all_headers(Info first_i,Comment first_c, int dataoffset)
{
Page og=new Page();
int ret;
vi=new Info[links];
vc=new Comment[links];
dataoffsets=new long[links];
pcmlengths=new long[links];
serialnos=new int[links];
for(int i=0;i<links;i++)
{
if(first_i!=null && first_c!=null && i==0)
{
// we already grabbed the initial header earlier. This just
// saves the waste of grabbing it again
// !!!!!!!!!!!!!
vi[i]=first_i;
//memcpy(vf->vi+i,first_i,sizeof(vorbis_info));
vc[i]=first_c;
//memcpy(vf->vc+i,first_c,sizeof(vorbis_comment));
dataoffsets[i]=dataoffset;
}
else
{
// seek to the location of the initial header
seek_helper(offsets[i]); //!!!
if(fetch_headers(vi[i], vc[i], null, null)==-1)
{
Console.Error.WriteLine("Error opening logical bitstream #"+(i+1)+"\n");
dataoffsets[i]=-1;
}
else
{
dataoffsets[i]=offset;
os.clear();
}
}
// get the serial number and PCM length of this link. To do this,
// get the last page of the stream
long end=offsets[i+1]; //!!!
seek_helper(end);
while(true)
{
ret=get_prev_page(og);
if(ret==-1)
{
// this should not be possible
Console.Error.WriteLine("Could not find last page of logical "+
"bitstream #"+(i)+"\n");
vi[i].clear();
vc[i].clear();
break;
}
if(og.granulepos()!=-1)
{
serialnos[i]=og.serialno();
pcmlengths[i]=og.granulepos();
break;
}
}
}
}
// uses the local ogg_stream storage in vf; this is important for
// non-streaming input sources
int fetch_headers(Info vi, Comment vc, int[] serialno, Page og_ptr)
{
//System.err.println("fetch_headers");
Page og=new Page();
Packet op=new Packet();
int ret;
if(og_ptr==null)
{
ret=get_next_page(og, CHUNKSIZE);
if(ret==OV_EREAD)return OV_EREAD;
if(ret<0) return OV_ENOTVORBIS;
og_ptr=og;
}
if(serialno!=null)serialno[0]=og_ptr.serialno();
os.init(og_ptr.serialno());
// extract the initial header from the first page and verify that the
// Ogg bitstream is in fact Vorbis data
vi.init();
vc.init();
int i=0;
while(i<3)
{
os.pagein(og_ptr);
while(i<3)
{
int result=os.packetout(op);
if(result==0)break;
if(result==-1)
{
Console.Error.WriteLine("Corrupt header in logical bitstream.");
//goto bail_header;
vi.clear();
vc.clear();
os.clear();
return -1;
}
if(vi.synthesis_headerin(vc, op)!=0)
{
Console.Error.WriteLine("Illegal header in logical bitstream.");
//goto bail_header;
vi.clear();
vc.clear();
os.clear();
return -1;
}
i++;
}
if(i<3)
if(get_next_page(og_ptr, 1)<0)
{
Console.Error.WriteLine("Missing header in logical bitstream.");
//goto bail_header;
vi.clear();
vc.clear();
os.clear();
return -1;
}
}
return 0;
}
Stream DecodeStream( Stream input, bool skipWavHeader )
{
int convsize = 4096 * 2;
byte [] convbuffer = new byte [ convsize ];
Stream output = new MemoryStream ();
if ( !skipWavHeader )
output.Seek ( HEADER_SIZE, SeekOrigin.Begin );
SyncState oy = new SyncState ();
StreamState os = new StreamState ();
Page og = new Page ();
Packet op = new Packet ();
Info vi = new Info ();
Comment vc = new Comment ();
DspState vd = new DspState ();
Block vb = new Block ( vd );
byte [] buffer;
int bytes = 0;
oy.init ();
while ( true )
{
int eos = 0;
int index = oy.buffer ( 4096 );
buffer = oy.data;
bytes = input.Read ( buffer, index, 4096 );
oy.wrote ( bytes );
if ( oy.pageout ( og ) != 1 )
{
if ( bytes < 4096 ) break;
throw new Exception ( "Input does not appear to be an Ogg bitstream." );
}
os.init ( og.serialno () );
vi.init ();
vc.init ();
if ( os.pagein ( og ) < 0 )
{
throw new Exception ( "Error reading first page of Ogg bitstream data." );
}
if ( os.packetout ( op ) != 1 )
{
throw new Exception ( "Error reading initial header packet." );
}
if ( vi.synthesis_headerin ( vc, op ) < 0 )
{
throw new Exception ( "This Ogg bitstream does not contain Vorbis audio data." );
}
int i = 0;
while ( i < 2 )
{
while ( i < 2 )
{
int result = oy.pageout ( og );
if ( result == 0 ) break;
if ( result == 1 )
{
os.pagein ( og );
while ( i < 2 )
{
result = os.packetout ( op );
if ( result == 0 ) break;
if ( result == -1 )
{
throw new Exception ( "Corrupt secondary header. Exiting." );
}
vi.synthesis_headerin ( vc, op );
i++;
}
}
}
index = oy.buffer ( 4096 );
buffer = oy.data;
bytes = input.Read ( buffer, index, 4096 );
if ( bytes == 0 && i < 2 )
{
throw new Exception ( "End of file before finding all Vorbis headers!" );
}
oy.wrote ( bytes );
}
{
byte [] [] ptr = vc.user_comments;
for ( int j = 0; j < vc.user_comments.Length; j++ )
{
if ( ptr [ j ] == null ) break;
}
}
convsize = 4096 / vi.channels;
vd.synthesis_init ( vi );
vb.init ( vd );
float [] [] [] _pcm = new float [ 1 ] [][];
int [] _index = new int [ vi.channels ];
while ( eos == 0 )
{
while ( eos == 0 )
{
int result = oy.pageout ( og );
if ( result == 0 ) break;
if ( result == -1 )
throw new Exception ( "Corrupt or missing data in bitstream; continuing..." );
else
{
os.pagein ( og );
while ( true )
{
result = os.packetout ( op );
if ( result == 0 ) break;
if ( result == -1 )
{
}
else
{
int samples;
if ( vb.synthesis ( op ) == 0 )
{
vd.synthesis_blockin ( vb );
}
while ( ( samples = vd.synthesis_pcmout ( _pcm, _index ) ) > 0 )
{
float [] [] pcm = _pcm [ 0 ];
bool clipflag = false;
int bout = ( samples < convsize ? samples : convsize );
for ( i = 0; i < vi.channels; i++ )
{
int ptr = i * 2;
int mono = _index [ i ];
for ( int j = 0; j < bout; j++ )
{
int val = ( int ) ( pcm [ i ] [ mono + j ] * 32767.0 );
if ( val > 32767 )
{
val = 32767;
clipflag = true;
}
if ( val < -32768 )
{
val = -32768;
clipflag = true;
}
if ( val < 0 ) val = val | 0x8000;
convbuffer [ ptr ] = ( byte ) ( val );
convbuffer [ ptr + 1 ] = ( byte ) ( ( uint ) val >> 8 );
ptr += 2 * ( vi.channels );
}
}
if ( clipflag )
{
}
output.Write ( convbuffer, 0, 2 * vi.channels * bout );
vd.synthesis_read ( bout );
}
}
}
if ( og.eos () != 0 ) eos = 1;
}
}
if ( eos == 0 )
{
index = oy.buffer ( 4096 );
buffer = oy.data;
bytes = input.Read ( buffer, index, 4096 );
oy.wrote ( bytes );
if ( bytes == 0 ) eos = 1;
}
}
os.clear ();
vb.clear ();
vd.clear ();
vi.clear ();
}
oy.clear ();
output.Seek ( 0, SeekOrigin.Begin );
if ( !skipWavHeader )
{
WriteHeader ( output, ( int ) ( output.Length - HEADER_SIZE ), vi.rate, ( ushort ) 16, ( ushort ) vi.channels );
output.Seek ( 0, SeekOrigin.Begin );
}
return output;
}
static MemoryStream DecodeStream(Stream input, bool skipWavHeader, out Info vi)
{
int convsize = 4096 * 2;
byte[] convbuffer = new byte[convsize]; // take 8k out of the data segment, not the stack
TextWriter s_err = new DebugWriter();
var output = new MemoryStream();
if (!skipWavHeader)
{
output.Seek(HEADER_SIZE, SeekOrigin.Begin); // reserve place for WAV header
}
SyncState oy = new SyncState(); // sync and verify incoming physical bitstream
StreamState os = new StreamState(); // take physical pages, weld into a logical stream of packets
Page og = new Page(); // one Ogg bitstream page. Vorbis packets are inside
Packet op = new Packet(); // one raw packet of data for decode
vi = new Info(); // struct that stores all the static vorbis bitstream settings
Comment vc = new Comment(); // struct that stores all the bitstream user comments
DspState vd = new DspState(); // central working state for the packet->PCM decoder
Block vb = new Block(vd); // local working space for packet->PCM decode
byte[] buffer;
int bytes = 0;
// Decode setup
oy.init(); // Now we can read pages
while (true)
{ // we repeat if the bitstream is chained
int eos = 0;
// grab some data at the head of the stream. We want the first page
// (which is guaranteed to be small and only contain the Vorbis
// stream initial header) We need the first page to get the stream
// serialno.
// submit a 4k block to libvorbis' Ogg layer
int index = oy.buffer(4096);
buffer = oy.data;
try
{
bytes = input.Read(buffer, index, 4096);
}
catch (Exception e)
{
s_err.WriteLine(e);
}
oy.wrote(bytes);
// Get the first page.
if (oy.pageout(og) != 1)
{
// have we simply run out of data? If so, we're done.
if (bytes < 4096)
{
break;
}
// error case. Must not be Vorbis data
s_err.WriteLine("Input does not appear to be an Ogg bitstream.");
}
// Get the serial number and set up the rest of decode.
// serialno first; use it to set up a logical stream
os.init(og.serialno());
// extract the initial header from the first page and verify that the
// Ogg bitstream is in fact Vorbis data
// I handle the initial header first instead of just having the code
// read all three Vorbis headers at once because reading the initial
// header is an easy way to identify a Vorbis bitstream and it's
// useful to see that functionality seperated out.
vi.init();
vc.init();
if (os.pagein(og) < 0)
{
// error; stream version mismatch perhaps
s_err.WriteLine("Error reading first page of Ogg bitstream data.");
}
if (os.packetout(op) != 1)
{
// no page? must not be vorbis
s_err.WriteLine("Error reading initial header packet.");
}
if (vi.synthesis_headerin(vc, op) < 0)
{
// error case; not a vorbis header
s_err.WriteLine("This Ogg bitstream does not contain Vorbis audio data.");
}
// At this point, we're sure we're Vorbis. We've set up the logical
// (Ogg) bitstream decoder. Get the comment and codebook headers and
// set up the Vorbis decoder
// The next two packets in order are the comment and codebook headers.
// They're likely large and may span multiple pages. Thus we reead
// and submit data until we get our two pacakets, watching that no
// pages are missing. If a page is missing, error out; losing a
// header page is the only place where missing data is fatal. */
int i = 0;
while (i < 2)
{
while (i < 2)
{
int result = oy.pageout(og);
if (result == 0)
{
break; // Need more data
}
// Don't complain about missing or corrupt data yet. We'll
// catch it at the packet output phase
if (result == 1)
{
os.pagein(og); // we can ignore any errors here
// as they'll also become apparent
// at packetout
while (i < 2)
{
result = os.packetout(op);
if (result == 0)
{
break;
}
if (result == -1)
{
// Uh oh; data at some point was corrupted or missing!
// We can't tolerate that in a header. Die.
s_err.WriteLine("Corrupt secondary header. Exiting.");
}
vi.synthesis_headerin(vc, op);
i++;
}
}
}
// no harm in not checking before adding more
index = oy.buffer(4096);
buffer = oy.data;
try
{
bytes = input.Read(buffer, index, 4096);
}
catch (Exception e)
{
s_err.WriteLine(e);
}
if (bytes == 0 && i < 2)
{
s_err.WriteLine("End of file before finding all Vorbis headers!");
}
oy.wrote(bytes);
}
// Throw the comments plus a few lines about the bitstream we're
// decoding
{
byte[][] ptr = vc.user_comments;
for (int j = 0; j < vc.user_comments.Length; j++)
{
if (ptr[j] == null)
{
break;
}
s_err.WriteLine(vc.getComment(j));
}
s_err.WriteLine("\nBitstream is " + vi.channels + " channel, " + vi.rate + "Hz");
s_err.WriteLine("Encoded by: " + vc.getVendor() + "\n");
}
convsize = 4096 / vi.channels;
// OK, got and parsed all three headers. Initialize the Vorbis
// packet->PCM decoder.
vd.synthesis_init(vi); // central decode state
vb.init(vd); // local state for most of the decode
// so multiple block decodes can
// proceed in parallel. We could init
// multiple vorbis_block structures
// for vd here
float[][][] _pcm = new float[1][][];
int[] _index = new int[vi.channels];
// The rest is just a straight decode loop until end of stream
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
s_err.WriteLine("Corrupt or missing data in bitstream; continuing...");
}
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];
bool clipflag = false;
int bout = (samples < convsize ? samples : convsize);
// convert floats to 16 bit signed ints (host order) and
// interleave
for (i = 0; i < vi.channels; i++)
{
int ptr = i * 2;
//int ptr=i;
int mono = _index[i];
for (int j = 0; j < bout; j++)
{
int val = (int)(pcm[i][mono + j] * 32767.0);
// short val=(short)(pcm[i][mono+j]*32767.);
// int val=(int)Math.round(pcm[i][mono+j]*32767.);
// might as well guard against clipping
if (val > 32767)
{
val = 32767;
clipflag = true;
}
if (val < -32768)
{
val = -32768;
clipflag = true;
}
if (val < 0)
{
val = val | 0x8000;
}
convbuffer[ptr] = (byte)(val);
convbuffer[ptr + 1] = (byte)((uint)val >> 8);
ptr += 2 * (vi.channels);
}
}
if (clipflag)
{
//s_err.WriteLine("Clipping in frame "+vd.sequence);
}
output.Write(convbuffer, 0, 2 * vi.channels * bout);
vd.synthesis_read(bout); // tell libvorbis how
// many samples we
// actually consumed
}
}
}
if (og.eos() != 0)
{
eos = 1;
}
}
}
if (eos == 0)
{
index = oy.buffer(4096);
buffer = oy.data;
try
{
bytes = input.Read(buffer, index, 4096);
}
catch (Exception e)
{
s_err.WriteLine(e);
}
oy.wrote(bytes);
if (bytes == 0)
{
eos = 1;
}
}
}
// clean up this logical bitstream; before exit we see if we're
// followed by another [chained]
os.clear();
// ogg_page and ogg_packet structs always point to storage in
// libvorbis. They're never freed or manipulated directly
vb.clear();
vd.clear();
vi.clear(); // must be called last
}
// OK, clean up the framer
oy.clear();
s_err.WriteLine("Done.");
output.Seek(0, SeekOrigin.Begin);
if (!skipWavHeader)
{
WriteHeader(output, (int)(output.Length - HEADER_SIZE), vi.rate, (ushort)16, (ushort)vi.channels);
output.Seek(0, SeekOrigin.Begin);
}
return(output);
}
