public void Write(Tag tag, Stream raf, Stream rafTemp) {
//Read firstPage----------------------------------------------------
raf.Seek(26, SeekOrigin.Begin);
byte[] b = new byte[4];
int pageSegments = raf.ReadByte()&0xFF; //Unsigned
raf.Seek(0, SeekOrigin.Begin);
b = new byte[27 + pageSegments];
raf.Read(b, 0, b.Length);
OggPageHeader firstPage = new OggPageHeader(b);
//------------------------------------------------------------------
raf.Seek(0, SeekOrigin.Begin);
//write 1st page (unchanged)----------------------------------------
byte[] pageBytes = new byte[firstPage.PageLength + 27 + pageSegments];
raf.Read(pageBytes, 0, pageBytes.Length);
rafTemp.Write(pageBytes, 0, pageBytes.Length);
//rafTemp.Seek(firstPage.PageLength + raf.Position, SeekOrigin.Current);
//------------------------------------------------------------------
//Read 2nd page-----------------------------------------------------
long pos = raf.Position;
raf.Seek(raf.Position + 26, SeekOrigin.Begin);
pageSegments = raf.ReadByte()&0xFF; //Unsigned
raf.Seek(pos, SeekOrigin.Begin);
b = new byte[27 + pageSegments];
raf.Read(b, 0, b.Length);
OggPageHeader secondPage = new OggPageHeader(b);
long secondPageEndPos = raf.Position;
//------------------------------------------------------------------
//Compute old comment length----------------------------------------
int oldCommentLength = 7; // [.vorbis]
raf.Seek(raf.Position + 7, SeekOrigin.Begin);
b = new byte[4];
raf.Read(b, 0, b.Length);
int vendorstringLength = Utils.GetNumber(b, 0,3);
oldCommentLength += 4 + vendorstringLength;
raf.Seek(raf.Position + vendorstringLength, SeekOrigin.Begin);
b = new byte[4];
raf.Read(b, 0, b.Length);
int userComments = Utils.GetNumber(b, 0,3);
oldCommentLength += 4;
for (int i = 0; i < userComments; i++) {
b = new byte[4];
raf.Read(b, 0, b.Length);
int commentLength = Utils.GetNumber(b, 0,3);
oldCommentLength += 4 + commentLength;
raf.Seek(raf.Position + commentLength, SeekOrigin.Begin);
}
int isValid = raf.ReadByte();
oldCommentLength += 1;
if (isValid != 1)
throw new CannotWriteException("Unable to retreive old tag informations");
//------------------------------------------------------------------
//Get the new comment and create the container bytebuffer for 2nd page---
ByteBuffer newComment = tc.Convert(tag);
int newCommentLength = newComment.Capacity;
int newSecondPageLength = secondPage.PageLength - oldCommentLength + newCommentLength;
byte[] segmentTable = CreateSegmentTable(oldCommentLength,newCommentLength,secondPage);
int newSecondPageHeaderLength = 27 + segmentTable.Length;
ByteBuffer secondPageBuffer = new ByteBuffer(newSecondPageLength + newSecondPageHeaderLength);
//------------------------------------------------------------------
//Build the new second page header----------------------------------
//OggS capture
secondPageBuffer.Put(Utils.GetBytes("OggS"));
//Stream struct revision
secondPageBuffer.Put((byte) 0);
//header_type_flag
secondPageBuffer.Put((byte) 0);
//absolute granule position
secondPageBuffer.Put(
new byte[] {
(byte) 0,
(byte) 0,
(byte) 0,
(byte) 0,
(byte) 0,
(byte) 0,
(byte) 0,
(byte) 0 });
//stream serial number
secondPageBuffer.Put(Utils.GetNumber(secondPage.SerialNumber));
//page sequence no
secondPageBuffer.Put(Utils.GetNumber(secondPage.PageSequence));
//CRC (to be computed later)
secondPageBuffer.Put(new byte[] {(byte) 0, (byte) 0, (byte) 0, (byte) 0 });
int crcOffset = 22;
if (segmentTable.Length > 255) {
throw new CannotWriteException ("In this special case we need to " +
"create a new page, since we still hadn't the time for that " +
"we won't write because it wouldn't create an ogg file.");
}
//page_segments nb.
secondPageBuffer.Put((byte)segmentTable.Length);
//page segment table
for (int i = 0; i < segmentTable.Length; i++)
secondPageBuffer.Put(segmentTable[i]);
//------------------------------------------------------------------
//Add to the new second page the new comment------------------------
secondPageBuffer.Put(newComment);
//------------------------------------------------------------------
//Add the remaining old second page (encoding infos, etc)-----------
raf.Seek(secondPageEndPos+oldCommentLength, SeekOrigin.Begin);
secondPageBuffer.Put(raf);
//------------------------------------------------------------------
//Compute CRC over the new second page------------------------------
byte[] crc = OggCRCFactory.ComputeCRC(secondPageBuffer.Data);
for (int i = 0; i < crc.Length; i++) {
secondPageBuffer.Put(crcOffset + i, crc[i]);
}
//------------------------------------------------------------------
//Transfer the second page bytebuffer content-----------------------
secondPageBuffer.Rewind();
rafTemp.Write(secondPageBuffer.Data, 0, secondPageBuffer.Data.Length);
//------------------------------------------------------------------
//Write the rest of the original file-------------------------------
byte[] buf = new byte[65536];
int read = raf.Read(buf, 0, buf.Length);
while (read != 0) {
rafTemp.Write(buf, 0, read);
read = raf.Read(buf, 0, buf.Length);
}
//rafTemp.getChannel().transferFrom(raf.getChannel(), rafTemp.Position, raf.Length() - raf.Position);
//------------------------------------------------------------------
}
public Tag Read( Stream raf ) {
long oldPos = 0;
//----------------------------------------------------------
//Check wheter we have an ogg stream---------------
raf.Seek( 0 , SeekOrigin.Begin);
byte[] b = new byte[4];
raf.Read(b, 0, b.Length);
string ogg = new string(System.Text.Encoding.ASCII.GetChars(b));
if( ogg != "OggS" )
throw new CannotReadException("OggS Header could not be found, not an ogg stream");
//--------------------------------------------------
//Parse the tag ------------------------------------
raf.Seek( 0 , SeekOrigin.Begin);
//Supposing 1st page = codec infos
// 2nd page = comment+decode info
//...Extracting 2nd page
//1st page to get the length
b = new byte[4];
oldPos = raf.Position;
raf.Seek(26, SeekOrigin.Begin);
int pageSegments = raf.ReadByte()&0xFF; //unsigned
raf.Seek(oldPos, SeekOrigin.Begin);
b = new byte[27 + pageSegments];
raf.Read( b , 0, b .Length);
OggPageHeader pageHeader = new OggPageHeader( b );
raf.Seek( raf.Position + pageHeader.PageLength , SeekOrigin.Begin);
//2nd page extraction
oldPos = raf.Position;
raf.Seek(raf.Position + 26, SeekOrigin.Begin);
pageSegments = raf.ReadByte()&0xFF; //unsigned
raf.Seek(oldPos, SeekOrigin.Begin);
b = new byte[27 + pageSegments];
raf.Read( b , 0, b .Length);
pageHeader = new OggPageHeader( b );
b = new byte[7];
raf.Read( b , 0, b .Length);
string vorbis = new string(System.Text.Encoding.ASCII.GetChars(b, 1, 6));
if(b[0] != 3 || vorbis != "vorbis")
throw new CannotReadException("Cannot find comment block (no vorbis header)");
//Begin tag reading
OggTag tag = oggTagReader.Read(raf);
byte isValid = (byte) raf.ReadByte();
if ( isValid == 0 )
throw new CannotReadException("Error: The OGG Stream isn't valid, could not extract the tag");
return tag;
}
/**
* This method creates a new segment table for the second page (header).
* @param oldCommentLength The lentgh of the old comment section, used to verify
* the old secment table
* @param newCommentLength Of this value the start of the segment table
* will be created.
* @param secondPage The second page from the source file.
* @return new segment table.
*/
private byte[] CreateSegmentTable(int oldCommentLength, int newCommentLength, OggPageHeader secondPage) {
int totalLenght = secondPage.PageLength;
byte[] restShouldBe = CreateSegments(totalLenght-oldCommentLength,false);
byte[] newStart = CreateSegments(newCommentLength,true);
byte[] result = new byte[newStart.Length+restShouldBe.Length];
newStart.CopyTo(result, 0);
restShouldBe.CopyTo(result, newStart.Length);
return result;
}
public EncodingInfo Read( Stream raf ) {
EncodingInfo info = new EncodingInfo();
long oldPos = 0;
//Reads the file encoding infos -----------------------------------
raf.Seek( 0 , SeekOrigin.Begin);
double PCMSamplesNumber = -1;
raf.Seek( raf.Length-2, SeekOrigin.Begin);
while(raf.Position >= 4) {
if(raf.ReadByte()==0x53) {
raf.Seek( raf.Position - 4, SeekOrigin.Begin);
byte[] ogg = new byte[3];
raf.Read(ogg, 0, 3);
if(ogg[0]==0x4F && ogg[1]==0x67 && ogg[2]==0x67) {
raf.Seek( raf.Position - 3, SeekOrigin.Begin);
oldPos = raf.Position;
raf.Seek(raf.Position + 26, SeekOrigin.Begin);
int _pageSegments = raf.ReadByte()&0xFF; //Unsigned
raf.Seek( oldPos , SeekOrigin.Begin);
byte[] _b = new byte[27 + _pageSegments];
raf.Read( _b, 0, _b.Length );
OggPageHeader _pageHeader = new OggPageHeader( _b );
raf.Seek(0, SeekOrigin.Begin);
PCMSamplesNumber = _pageHeader.AbsoluteGranulePosition;
break;
}
}
raf.Seek( raf.Position - 2, SeekOrigin.Begin);
}
if(PCMSamplesNumber == -1){
throw new CannotReadException("Error: Could not find the Ogg Setup block");
}
//Supposing 1st page = codec infos
// 2nd page = comment+decode info
//...Extracting 1st page
byte[] b = new byte[4];
oldPos = raf.Position;
raf.Seek(26, SeekOrigin.Begin);
int pageSegments = raf.ReadByte()&0xFF; //Unsigned
raf.Seek( oldPos , SeekOrigin.Begin);
b = new byte[27 + pageSegments];
raf.Read( b , 0, b .Length);
OggPageHeader pageHeader = new OggPageHeader( b );
byte[] vorbisData = new byte[pageHeader.PageLength];
raf.Read( vorbisData , 0, vorbisData.Length);
VorbisCodecHeader vorbisCodecHeader = new VorbisCodecHeader( vorbisData );
//Populates encodingInfo----------------------------------------------------
info.Duration = new TimeSpan((long)(PCMSamplesNumber / vorbisCodecHeader.SamplingRate) * TimeSpan.TicksPerSecond);
info.ChannelNumber = vorbisCodecHeader.ChannelNumber;
info.SamplingRate = vorbisCodecHeader.SamplingRate;
info.EncodingType = vorbisCodecHeader.EncodingType;
info.ExtraEncodingInfos = "";
if(vorbisCodecHeader.NominalBitrate != 0
&& vorbisCodecHeader.MaxBitrate == vorbisCodecHeader.NominalBitrate
&& vorbisCodecHeader.MinBitrate == vorbisCodecHeader.NominalBitrate) {
//CBR
info.Bitrate = vorbisCodecHeader.NominalBitrate;
info.Vbr = false;
}
else if(vorbisCodecHeader.NominalBitrate != 0
&& vorbisCodecHeader.MaxBitrate == 0
&& vorbisCodecHeader.MinBitrate == 0) {
//Average vbr
info.Bitrate = vorbisCodecHeader.NominalBitrate;
info.Vbr = true;
}
else {
info.Bitrate = ComputeBitrate( (int)info.Duration.TotalSeconds, raf.Length );
info.Vbr = true;
}
return info;
}
public void Write(Tag tag, Stream raf, Stream rafTemp)
{
//Read firstPage----------------------------------------------------
raf.Seek(26, SeekOrigin.Begin);
byte[] b = new byte[4];
int pageSegments = raf.ReadByte() & 0xFF; //Unsigned
raf.Seek(0, SeekOrigin.Begin);
b = new byte[27 + pageSegments];
raf.Read(b, 0, b.Length);
OggPageHeader firstPage = new OggPageHeader(b);
//------------------------------------------------------------------
raf.Seek(0, SeekOrigin.Begin);
//write 1st page (unchanged)----------------------------------------
byte[] pageBytes = new byte[firstPage.PageLength + 27 + pageSegments];
raf.Read(pageBytes, 0, pageBytes.Length);
rafTemp.Write(pageBytes, 0, pageBytes.Length);
//rafTemp.Seek(firstPage.PageLength + raf.Position, SeekOrigin.Current);
//------------------------------------------------------------------
//Read 2nd page-----------------------------------------------------
long pos = raf.Position;
raf.Seek(raf.Position + 26, SeekOrigin.Begin);
pageSegments = raf.ReadByte() & 0xFF; //Unsigned
raf.Seek(pos, SeekOrigin.Begin);
b = new byte[27 + pageSegments];
raf.Read(b, 0, b.Length);
OggPageHeader secondPage = new OggPageHeader(b);
long secondPageEndPos = raf.Position;
//------------------------------------------------------------------
//Compute old comment length----------------------------------------
int oldCommentLength = 7; // [.vorbis]
raf.Seek(raf.Position + 7, SeekOrigin.Begin);
b = new byte[4];
raf.Read(b, 0, b.Length);
int vendorstringLength = Utils.GetNumber(b, 0, 3);
oldCommentLength += 4 + vendorstringLength;
raf.Seek(raf.Position + vendorstringLength, SeekOrigin.Begin);
b = new byte[4];
raf.Read(b, 0, b.Length);
int userComments = Utils.GetNumber(b, 0, 3);
oldCommentLength += 4;
for (int i = 0; i < userComments; i++)
{
b = new byte[4];
raf.Read(b, 0, b.Length);
int commentLength = Utils.GetNumber(b, 0, 3);
oldCommentLength += 4 + commentLength;
raf.Seek(raf.Position + commentLength, SeekOrigin.Begin);
}
int isValid = raf.ReadByte();
oldCommentLength += 1;
if (isValid != 1)
{
throw new CannotWriteException("Unable to retreive old tag informations");
}
//------------------------------------------------------------------
//Get the new comment and create the container bytebuffer for 2nd page---
ByteBuffer newComment = tc.Convert(tag);
int newCommentLength = newComment.Capacity;
int newSecondPageLength = secondPage.PageLength - oldCommentLength + newCommentLength;
byte[] segmentTable = CreateSegmentTable(oldCommentLength, newCommentLength, secondPage);
int newSecondPageHeaderLength = 27 + segmentTable.Length;
ByteBuffer secondPageBuffer = new ByteBuffer(newSecondPageLength + newSecondPageHeaderLength);
//------------------------------------------------------------------
//Build the new second page header----------------------------------
//OggS capture
secondPageBuffer.Put(Utils.GetBytes("OggS"));
//Stream struct revision
secondPageBuffer.Put((byte)0);
//header_type_flag
secondPageBuffer.Put((byte)0);
//absolute granule position
secondPageBuffer.Put(
new byte[] {
(byte)0,
(byte)0,
(byte)0,
(byte)0,
(byte)0,
(byte)0,
(byte)0,
(byte)0
});
//stream serial number
secondPageBuffer.Put(Utils.GetNumber(secondPage.SerialNumber));
//page sequence no
secondPageBuffer.Put(Utils.GetNumber(secondPage.PageSequence));
//CRC (to be computed later)
secondPageBuffer.Put(new byte[] { (byte)0, (byte)0, (byte)0, (byte)0 });
int crcOffset = 22;
if (segmentTable.Length > 255)
{
throw new CannotWriteException("In this special case we need to " +
"create a new page, since we still hadn't the time for that " +
"we won't write because it wouldn't create an ogg file.");
}
//page_segments nb.
secondPageBuffer.Put((byte)segmentTable.Length);
//page segment table
for (int i = 0; i < segmentTable.Length; i++)
{
secondPageBuffer.Put(segmentTable[i]);
}
//------------------------------------------------------------------
//Add to the new second page the new comment------------------------
secondPageBuffer.Put(newComment);
//------------------------------------------------------------------
//Add the remaining old second page (encoding infos, etc)-----------
raf.Seek(secondPageEndPos + oldCommentLength, SeekOrigin.Begin);
secondPageBuffer.Put(raf);
//------------------------------------------------------------------
//Compute CRC over the new second page------------------------------
byte[] crc = OggCRCFactory.ComputeCRC(secondPageBuffer.Data);
for (int i = 0; i < crc.Length; i++)
{
secondPageBuffer.Put(crcOffset + i, crc[i]);
}
//------------------------------------------------------------------
//Transfer the second page bytebuffer content-----------------------
secondPageBuffer.Rewind();
rafTemp.Write(secondPageBuffer.Data, 0, secondPageBuffer.Data.Length);
//------------------------------------------------------------------
//Write the rest of the original file-------------------------------
byte[] buf = new byte[65536];
int read = raf.Read(buf, 0, buf.Length);
while (read != 0)
{
rafTemp.Write(buf, 0, read);
read = raf.Read(buf, 0, buf.Length);
}
//rafTemp.getChannel().transferFrom(raf.getChannel(), rafTemp.Position, raf.Length() - raf.Position);
//------------------------------------------------------------------
}
/**
* This method creates a new segment table for the second page (header).
* @param oldCommentLength The lentgh of the old comment section, used to verify
* the old secment table
* @param newCommentLength Of this value the start of the segment table
* will be created.
* @param secondPage The second page from the source file.
* @return new segment table.
*/
private byte[] CreateSegmentTable(int oldCommentLength, int newCommentLength, OggPageHeader secondPage)
{
int totalLenght = secondPage.PageLength;
byte[] restShouldBe = CreateSegments(totalLenght - oldCommentLength, false);
byte[] newStart = CreateSegments(newCommentLength, true);
byte[] result = new byte[newStart.Length + restShouldBe.Length];
newStart.CopyTo(result, 0);
restShouldBe.CopyTo(result, newStart.Length);
return(result);
}
public Tag Read(Stream raf)
{
long oldPos = 0;
//----------------------------------------------------------
//Check wheter we have an ogg stream---------------
raf.Seek(0, SeekOrigin.Begin);
byte[] b = new byte[4];
raf.Read(b, 0, b.Length);
string ogg = new string(System.Text.Encoding.ASCII.GetChars(b));
if (ogg != "OggS")
{
throw new CannotReadException("OggS Header could not be found, not an ogg stream");
}
//--------------------------------------------------
//Parse the tag ------------------------------------
raf.Seek(0, SeekOrigin.Begin);
//Supposing 1st page = codec infos
// 2nd page = comment+decode info
//...Extracting 2nd page
//1st page to get the length
b = new byte[4];
oldPos = raf.Position;
raf.Seek(26, SeekOrigin.Begin);
int pageSegments = raf.ReadByte() & 0xFF; //unsigned
raf.Seek(oldPos, SeekOrigin.Begin);
b = new byte[27 + pageSegments];
raf.Read(b, 0, b.Length);
OggPageHeader pageHeader = new OggPageHeader(b);
raf.Seek(raf.Position + pageHeader.PageLength, SeekOrigin.Begin);
//2nd page extraction
oldPos = raf.Position;
raf.Seek(raf.Position + 26, SeekOrigin.Begin);
pageSegments = raf.ReadByte() & 0xFF; //unsigned
raf.Seek(oldPos, SeekOrigin.Begin);
b = new byte[27 + pageSegments];
raf.Read(b, 0, b.Length);
pageHeader = new OggPageHeader(b);
b = new byte[7];
raf.Read(b, 0, b.Length);
string vorbis = new string(System.Text.Encoding.ASCII.GetChars(b, 1, 6));
if (b[0] != 3 || vorbis != "vorbis")
{
throw new CannotReadException("Cannot find comment block (no vorbis header)");
}
//Begin tag reading
OggTag tag = oggTagReader.Read(raf);
byte isValid = (byte)raf.ReadByte();
if (isValid == 0)
{
throw new CannotReadException("Error: The OGG Stream isn't valid, could not extract the tag");
}
return(tag);
}
public EncodingInfo Read(Stream raf)
{
EncodingInfo info = new EncodingInfo();
long oldPos = 0;
//Reads the file encoding infos -----------------------------------
raf.Seek(0, SeekOrigin.Begin);
double PCMSamplesNumber = -1;
raf.Seek(raf.Length - 2, SeekOrigin.Begin);
while (raf.Position >= 4)
{
if (raf.ReadByte() == 0x53)
{
raf.Seek(raf.Position - 4, SeekOrigin.Begin);
byte[] ogg = new byte[3];
raf.Read(ogg, 0, 3);
if (ogg[0] == 0x4F && ogg[1] == 0x67 && ogg[2] == 0x67)
{
raf.Seek(raf.Position - 3, SeekOrigin.Begin);
oldPos = raf.Position;
raf.Seek(raf.Position + 26, SeekOrigin.Begin);
int _pageSegments = raf.ReadByte() & 0xFF; //Unsigned
raf.Seek(oldPos, SeekOrigin.Begin);
byte[] _b = new byte[27 + _pageSegments];
raf.Read(_b, 0, _b.Length);
OggPageHeader _pageHeader = new OggPageHeader(_b);
raf.Seek(0, SeekOrigin.Begin);
PCMSamplesNumber = _pageHeader.AbsoluteGranulePosition;
break;
}
}
raf.Seek(raf.Position - 2, SeekOrigin.Begin);
}
if (PCMSamplesNumber == -1)
{
throw new CannotReadException("Error: Could not find the Ogg Setup block");
}
//Supposing 1st page = codec infos
// 2nd page = comment+decode info
//...Extracting 1st page
byte[] b = new byte[4];
oldPos = raf.Position;
raf.Seek(26, SeekOrigin.Begin);
int pageSegments = raf.ReadByte() & 0xFF; //Unsigned
raf.Seek(oldPos, SeekOrigin.Begin);
b = new byte[27 + pageSegments];
raf.Read(b, 0, b.Length);
OggPageHeader pageHeader = new OggPageHeader(b);
byte[] vorbisData = new byte[pageHeader.PageLength];
raf.Read(vorbisData, 0, vorbisData.Length);
VorbisCodecHeader vorbisCodecHeader = new VorbisCodecHeader(vorbisData);
//Populates encodingInfo----------------------------------------------------
info.Duration = new TimeSpan((long)(PCMSamplesNumber / vorbisCodecHeader.SamplingRate) * TimeSpan.TicksPerSecond);
info.ChannelNumber = vorbisCodecHeader.ChannelNumber;
info.SamplingRate = vorbisCodecHeader.SamplingRate;
info.EncodingType = vorbisCodecHeader.EncodingType;
info.ExtraEncodingInfos = "";
if (vorbisCodecHeader.NominalBitrate != 0 &&
vorbisCodecHeader.MaxBitrate == vorbisCodecHeader.NominalBitrate &&
vorbisCodecHeader.MinBitrate == vorbisCodecHeader.NominalBitrate)
{
//CBR
info.Bitrate = vorbisCodecHeader.NominalBitrate;
info.Vbr = false;
}
else if (vorbisCodecHeader.NominalBitrate != 0 &&
vorbisCodecHeader.MaxBitrate == 0 &&
vorbisCodecHeader.MinBitrate == 0)
{
//Average vbr
info.Bitrate = vorbisCodecHeader.NominalBitrate;
info.Vbr = true;
}
else
{
info.Bitrate = ComputeBitrate((int)info.Duration.TotalSeconds, raf.Length);
info.Vbr = true;
}
return(info);
}
