public int header_out(Packet op)
{
csBuffer opb=new csBuffer();
opb.writeinit();
if(pack(opb)!=0) return OV_EIMPL;
op.packet_base = new byte[opb.bytes()];
op.packet=0;
op.bytes=opb.bytes();
Array.Copy(opb.buf(), 0, op.packet_base, 0, op.bytes);
op.b_o_s=0;
op.e_o_s=0;
op.granulepos=0;
return 0;
}
public int packetout(Packet op)
{
/* The last part of decode. We have the stream broken into packet
segments. Now we need to group them into packets (or return the
out of sync markers) */
int ptr=lacing_returned;
if(lacing_packet<=ptr)
{
return(0);
}
if((lacing_vals[ptr]&0x400)!=0)
{
/* We lost sync here; let the app know */
lacing_returned++;
/* we need to tell the codec there's a gap; it might need to
handle previous packet dependencies. */
packetno++;
return(-1);
}
/* Gather the whole packet. We'll have no holes or a partial packet */
{
int size=lacing_vals[ptr]&0xff;
int bytes=0;
op.packet_base=body_data;
op.packet=body_returned;
op.e_o_s=lacing_vals[ptr]&0x200; /* last packet of the stream? */
op.b_o_s=lacing_vals[ptr]&0x100; /* first packet of the stream? */
bytes+=size;
while(size==255)
{
int val=lacing_vals[++ptr];
size=val&0xff;
if((val&0x200)!=0)op.e_o_s=0x200;
bytes+=size;
}
op.packetno=packetno;
op.granulepos=granule_vals[ptr];
op.bytes=bytes;
//System.out.println(this+" # body_returned="+body_returned);
body_returned+=bytes;
//System.out.println(this+"## body_returned="+body_returned);
lacing_returned=ptr+1;
}
packetno++;
return(1);
}
// 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;
}
/* submit data to the internal buffer of the framing engine */
public int packetin(Packet op)
{
int lacing_val=op.bytes/255+1;
if(body_returned!=0)
{
/* advance packet data according to the body_returned pointer. We
had to keep it around to return a pointer into the buffer last
call */
body_fill-=body_returned;
if(body_fill!=0)
{
Array.Copy(body_data, body_returned, body_data, 0, body_fill);
}
body_returned=0;
}
/* make sure we have the buffer storage */
body_expand(op.bytes);
lacing_expand(lacing_val);
/* Copy in the submitted packet. Yes, the copy is a waste; this is
the liability of overly clean abstraction for the time being. It
will actually be fairly easy to eliminate the extra copy in the
future */
Array.Copy(op.packet_base, op.packet, body_data, body_fill, op.bytes);
body_fill+=op.bytes;
//System.out.println("add: "+body_fill);
/* Store lacing vals for this packet */
int j;
for(j=0;j<lacing_val-1;j++)
{
lacing_vals[lacing_fill+j]=255;
granule_vals[lacing_fill+j]=granulepos;
}
lacing_vals[lacing_fill+j]=(op.bytes)%255;
granulepos=granule_vals[lacing_fill+j]=op.granulepos;
/* flag the first segment as the beginning of the packet */
lacing_vals[lacing_fill]|= 0x100;
lacing_fill+=lacing_val;
/* for the sake of completeness */
packetno++;
if(op.e_o_s!=0)e_o_s=1;
return(0);
}
public int PacketIn(csogg.Packet p)
{
throw new NotImplementedException();
}
public int PacketIn(csogg.Packet pp)
{
Theora.ogg_packet op = new Theora.ogg_packet();
op.bytes = new IntPtr(pp.bytes);
op.b_o_s = new IntPtr(pp.b_o_s);
op.e_o_s = new IntPtr(pp.e_o_s);
op.granulepos = pp.granulepos;
op.packet = Marshal.UnsafeAddrOfPinnedArrayElement(pp.packet_base, pp.packet);
op.packetno = pp.packetno;
if (!HeadersRead)
{
int r = Theora.th_decode_headerin(ref info, ref comment, ref setup, ref op);
if (r == 0)
{
Console.WriteLine("header complete");
width = (int)info.frame_width;
height = (int)info.frame_height;
Data = new byte[width * height * 3];
Console.WriteLine(width.ToString() + "x" + height.ToString());
HeadersRead = true;
decode = Theora.th_decode_alloc(ref info, setup);
if (decode == IntPtr.Zero)
{
throw new Exception("decode");
}
}
else
{
return(0);
}
}
ogg_int64_t granpos = 0;
int i;
if (Theora.th_decode_packetin(decode, ref op, ref granpos) == 0)
{
//Console.WriteLine("frame complete"+granpos.ToString());
Theora.th_ycbcr_buffer picture = new Theora.th_ycbcr_buffer();
i = Theora.th_decode_ycbcr_out(decode, ref picture);
if (i != 0)
{
throw new Exception("picture");
}
float xfactor1 = (float)picture.plane1.width / (float)picture.plane0.width;
float yfactor1 = (float)picture.plane1.height / (float)picture.plane0.height;
float xfactor2 = (float)picture.plane2.width / (float)picture.plane0.width;
float yfactor2 = (float)picture.plane2.height / (float)picture.plane0.height;
if (ConvertToRGB)
{
for (int y = 0; y < picture.plane0.height; ++y)
{
for (int x = 0; x < picture.plane0.width; ++x)
{
float Y = Marshal.ReadByte(picture.plane0.data, y * picture.plane0.stride + x);
float Cb = Marshal.ReadByte(picture.plane1.data, (int)((float)y * yfactor1 * (float)picture.plane1.stride + (float)x * xfactor1));
float Cr = Marshal.ReadByte(picture.plane2.data, (int)((float)y * yfactor2 * (float)picture.plane2.stride + (float)x * xfactor2));
int R = (int)(Y + 1.402f * (Cr - 128.0f));
int G = (int)(Y - 0.34414f * (Cb - 128.0f) - 0.71414f * (Cr - 128.0f));
int B = (int)(Y + 1.772f * (Cb - 128.0f));
R = Clamp(R, 255, 0);
G = Clamp(G, 255, 0);
B = Clamp(B, 255, 0);
Data[y * width * 3 + x * 3] = (byte)B;
Data[y * width * 3 + x * 3 + 1] = (byte)G;
Data[y * width * 3 + x * 3 + 2] = (byte)R;
//w.WriteLine(R.ToString()+" "+G.ToString()+" "+B.ToString());
}
}
}
else
{
for (int y = 0; y < picture.plane0.height; ++y)
{
for (int x = 0; x < picture.plane0.width; ++x)
{
byte Y = Marshal.ReadByte(picture.plane0.data, y * picture.plane0.stride + x);
byte Cb = Marshal.ReadByte(picture.plane1.data, (int)((float)y * yfactor1 * (float)picture.plane1.stride + (float)x * xfactor1));
byte Cr = Marshal.ReadByte(picture.plane2.data, (int)((float)y * yfactor2 * (float)picture.plane2.stride + (float)x * xfactor2));
Data[y * width * 3 + x * 3] = (byte)Y;
Data[y * width * 3 + x * 3 + 1] = (byte)Cb;
Data[y * width * 3 + x * 3 + 2] = (byte)Cr;
//w.WriteLine(R.ToString()+" "+G.ToString()+" "+B.ToString());
}
}
}
//w.Close();
//f.Close();
frame++;
return(1);
}
return(0);
}
public int synthesis(Packet op)
{
Info vi=vd.vi;
// first things first. Make sure decode is ready
// ripcord();
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.mode_param[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];
//pcm=alloc(vi.channels);
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];
//pcm[i]=alloc(pcmend);
}
else
{
for(int j=0;j<pcmend;j++){ pcm[i][j]=0; }
}
}
// unpack_header enforces range checking
int type=vi.map_type[vi.mode_param[mode].mapping];
return(FuncMapping.mapping_P[type].inverse(this, vd.mode[mode]));
}
// fetch and process a packet. Handles the case where we're at a
// bitstream boundary and dumps the decoding machine. If the decoding
// machine is unloaded, it loads it. It also keeps pcm_offset up to
// date (seek and read both use this. seek uses a special hack with
// readp).
//
// return: -1) hole in the data (lost packet)
// 0) need more date (only if readp==0)/eof
// 1) got a packet
int process_packet(int readp)
{
Page og=new Page();
// handle one packet. Try to fetch it from current stream state
// extract packets from page
while(true)
{
// process a packet if we can. If the machine isn't loaded,
// neither is a page
if(decode_ready)
{
Packet op=new Packet();
int result=os.packetout(op);
long granulepos;
// if(result==-1)return(-1); // hole in the data. For now, swallow
// and go. We'll need to add a real
// error code in a bit.
if(result>0)
{
// got a packet. process it
granulepos=op.granulepos;
if(vb.synthesis(op)==0)
{ // lazy check for lazy
// header handling. The
// header packets aren't
// audio, so if/when we
// submit them,
// vorbis_synthesis will
// reject them
// suck in the synthesis data and track bitrate
{
int oldsamples=vd.synthesis_pcmout(null, null);
vd.synthesis_blockin(vb);
samptrack+=vd.synthesis_pcmout(null, null)-oldsamples;
bittrack+=op.bytes*8;
}
// update the pcm offset.
if(granulepos!=-1 && op.e_o_s==0)
{
int link=(skable?current_link:0);
int samples;
// this packet has a pcm_offset on it (the last packet
// completed on a page carries the offset) After processing
// (above), we know the pcm position of the *last* sample
// ready to be returned. Find the offset of the *first*
//
// As an aside, this trick is inaccurate if we begin
// reading anew right at the last page; the end-of-stream
// granulepos declares the last frame in the stream, and the
// last packet of the last page may be a partial frame.
// So, we need a previous granulepos from an in-sequence page
// to have a reference point. Thus the !op.e_o_s clause above
samples=vd.synthesis_pcmout(null, null);
granulepos-=samples;
for(int i=0;i<link;i++)
{
granulepos+=pcmlengths[i];
}
pcm_offset=granulepos;
}
return(1);
}
}
}
if(readp==0)return(0);
if(get_next_page(og,-1)<0)return(0); // eof. leave unitialized
// bitrate tracking; add the header's bytes here, the body bytes
// are done by packet above
bittrack+=og.header_len*8;
// has our decoding just traversed a bitstream boundary?
if(decode_ready)
{
if(current_serialno!=og.serialno())
{
decode_clear();
}
}
// Do we need to load a new machine before submitting the page?
// This is different in the seekable and non-seekable cases.
//
// In the seekable case, we already have all the header
// information loaded and cached; we just initialize the machine
// with it and continue on our merry way.
//
// In the non-seekable (streaming) case, we'll only be at a
// boundary if we just left the previous logical bitstream and
// we're now nominally at the header of the next bitstream
if(!decode_ready)
{
int i;
if(skable)
{
current_serialno=og.serialno();
// match the serialno to bitstream section. We use this rather than
// offset positions to avoid problems near logical bitstream
// boundaries
for(i=0;i<links;i++)
{
if(serialnos[i]==current_serialno)break;
}
if(i==links)return(-1); // sign of a bogus stream. error out,
// leave machine uninitialized
current_link=i;
os.init(current_serialno);
os.reset();
}
else
{
// we're streaming
// fetch the three header packets, build the info struct
int[] foo = new int[1];
int ret=fetch_headers(vi[0], vc[0], foo, og);
current_serialno=foo[0];
if(ret!=0)return ret;
current_link++;
i=0;
}
make_decode_ready();
}
os.pagein(og);
}
}
// 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.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(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]);
// }
}
// 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);
}
/// <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);
}
}
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;
}
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;
}
