public EncodingInfo Read(Stream raf)
{
//Read the infos--------------------------------------------------------
if (raf.Length == 0)
{
//Empty File
throw new CannotReadException("Error: File empty");
}
raf.Seek(0, SeekOrigin.Begin);
//FLAC Header string
byte[] b = new byte[4];
raf.Read(b, 0, b.Length);
string flac = new string(System.Text.Encoding.ASCII.GetChars(b));
if (flac != "fLaC")
{
throw new CannotReadException("fLaC Header not found");
}
MetadataBlockDataStreamInfo mbdsi = null;
bool isLastBlock = false;
while (!isLastBlock)
{
b = new byte[4];
raf.Read(b, 0, b.Length);
MetadataBlockHeader mbh = new MetadataBlockHeader(b);
if (mbh.BlockType == MetadataBlockHeader.BlockTypes.StreamInfo)
{
b = new byte[mbh.DataLength];
raf.Read(b, 0, b.Length);
mbdsi = new MetadataBlockDataStreamInfo(b);
if (!mbdsi.Valid)
{
throw new CannotReadException("FLAC StreamInfo not valid");
}
break;
}
raf.Seek(raf.Position + mbh.DataLength, SeekOrigin.Begin);
isLastBlock = mbh.IsLastBlock;
mbh = null; //Free memory
}
EncodingInfo info = new EncodingInfo();
info.Duration = new TimeSpan(mbdsi.Length * TimeSpan.TicksPerSecond);
info.ChannelNumber = mbdsi.ChannelNumber;
info.SamplingRate = mbdsi.SamplingRate;
info.EncodingType = mbdsi.EncodingType;
info.ExtraEncodingInfos = "";
info.Bitrate = ComputeBitrate(mbdsi.Length, raf.Length);
return(info);
}
public OggTag Read(Stream flacStream)
{
//Begins tag parsing-------------------------------------
if (flacStream.Length == 0)
{
//Empty File
throw new CannotReadException("Error: File empty");
}
flacStream.Seek(0, SeekOrigin.Begin);
//FLAC Header string
byte[] b = new byte[4];
flacStream.Read(b, 0, b.Length);
string flac = new string(System.Text.Encoding.ASCII.GetChars(b));
if (flac != "fLaC")
{
throw new CannotReadException("fLaC Header not found, not a flac file");
}
OggTag tag = null;
//Seems like we hava a valid stream
bool isLastBlock = false;
while (!isLastBlock)
{
b = new byte[4];
flacStream.Read(b, 0, b.Length);
MetadataBlockHeader mbh = new MetadataBlockHeader(b);
switch (mbh.BlockType)
{
//We got a vorbis comment block, parse it
case MetadataBlockHeader.BlockTypes.VorbisComment:
tag = HandleVorbisComment(mbh, flacStream);
mbh = null;
return(tag); //We have it, so no need to go further
//This is not a vorbis comment block, we skip to next block
default:
flacStream.Seek(flacStream.Position + mbh.DataLength, SeekOrigin.Begin);
break;
}
isLastBlock = mbh.IsLastBlock;
mbh = null;
}
//FLAC not found...
throw new CannotReadException("FLAC Tag could not be found or read..");
}
public EncodingInfo Read(Stream raf)
{
//Read the infos--------------------------------------------------------
if (raf.Length == 0) {
//Empty File
throw new CannotReadException("Error: File empty");
}
raf.Seek(0, SeekOrigin.Begin);
//FLAC Header string
byte[] b = new byte[4];
raf.Read(b, 0, b.Length);
string flac = new string(System.Text.Encoding.ASCII.GetChars(b));
if (flac != "fLaC") {
throw new CannotReadException("fLaC Header not found");
}
MetadataBlockDataStreamInfo mbdsi = null;
bool isLastBlock = false;
while (!isLastBlock) {
b = new byte[4];
raf.Read(b, 0, b.Length);
MetadataBlockHeader mbh = new MetadataBlockHeader(b);
if (mbh.BlockType == (int) MetadataBlockHeader.BlockTypes.StreamInfo) {
b = new byte[mbh.DataLength];
raf.Read(b, 0, b.Length);
mbdsi = new MetadataBlockDataStreamInfo(b);
if (!mbdsi.Valid) {
throw new CannotReadException("FLAC StreamInfo not valid");
}
break;
}
raf.Seek(raf.Position + mbh.DataLength, SeekOrigin.Begin);
isLastBlock = mbh.IsLastBlock;
mbh = null; //Free memory
}
EncodingInfo info = new EncodingInfo();
info.Length = mbdsi.Length;
info.ChannelNumber = mbdsi.ChannelNumber;
info.SamplingRate = mbdsi.SamplingRate;
info.EncodingType = mbdsi.EncodingType;
info.ExtraEncodingInfos = "";
info.Bitrate = ComputeBitrate(mbdsi.Length, raf.Length);
return info;
}
private OggTag HandleVorbisComment(MetadataBlockHeader mbh, Stream flacStream)
{
long oldPos = flacStream.Position;
OggTag tag = oggTagReader.Read(flacStream);
long newPos = flacStream.Position;
if (newPos - oldPos != mbh.DataLength)
{
throw new CannotReadException("Tag length do not match with flac comment data length");
}
return(tag);
}
public OggTag Read( Stream flacStream )
{
//Begins tag parsing-------------------------------------
if ( flacStream.Length==0 ) {
//Empty File
throw new CannotReadException("Error: File empty");
}
flacStream.Seek( 0 , SeekOrigin.Begin);
//FLAC Header string
byte[] b = new byte[4];
flacStream.Read(b, 0, b.Length);
string flac = new string(System.Text.Encoding.ASCII.GetChars(b));
if(flac != "fLaC")
throw new CannotReadException("fLaC Header not found, not a flac file");
OggTag tag = null;
//Seems like we hava a valid stream
bool isLastBlock = false;
while(!isLastBlock) {
b = new byte[4];
flacStream.Read(b, 0, b.Length);
MetadataBlockHeader mbh = new MetadataBlockHeader(b);
switch(mbh.BlockType) {
//We got a vorbis comment block, parse it
case (int)MetadataBlockHeader.BlockTypes.VorbisComment :
tag = HandleVorbisComment(mbh, flacStream);
mbh = null;
return tag; //We have it, so no need to go further
//This is not a vorbis comment block, we skip to next block
default :
flacStream.Seek(flacStream.Position+mbh.DataLength, SeekOrigin.Begin);
break;
}
isLastBlock = mbh.IsLastBlock;
mbh = null;
}
//FLAC not found...
throw new CannotReadException("FLAC Tag could not be found or read..");
}
public void Write( Tag tag, Stream raf, Stream rafTemp ) {
//Clean up old datas
ArrayList metadataBlockPadding = new ArrayList(1);
ArrayList metadataBlocks = new ArrayList();
byte[] b = new byte[4];
raf.Read(b, 0, b.Length);
if(new string(System.Text.Encoding.ASCII.GetChars(b)) != "fLaC")
throw new CannotWriteException("This is not a FLAC file");
bool isLastBlock = false;
while(!isLastBlock) {
b = new byte[4];
raf.Read(b, 0, 4);
MetadataBlockHeader mbh = new MetadataBlockHeader(b);
if (mbh.BlockType == MetadataBlockHeader.BlockTypes.Padding) {
raf.Seek(mbh.DataLength, SeekOrigin.Current);
metadataBlockPadding.Add(mbh.DataLength+4);
}
else {
b = new byte[mbh.DataLength];
raf.Read(b, 0, b.Length);
metadataBlocks.Add(new MetadataBlockData(mbh, b));
}
isLastBlock = mbh.IsLastBlock;
}
int availableRoom = ComputeAvailableRoom(metadataBlockPadding, metadataBlocks);
int newTagSize = tc.GetTagLength(tag);
int neededRoom = newTagSize + ComputeNeededRoom(metadataBlockPadding, metadataBlocks);
raf.Seek(0, SeekOrigin.Begin);
if(availableRoom>=neededRoom) {
//OVERWRITE EXISTING TAG
raf.Seek(42, SeekOrigin.Begin);
foreach (MetadataBlockData data in metadataBlocks) {
raf.Write(data.Header.Data, 0, data.Header.Data.Length);
raf.Write(data.Bytes, 0, data.Bytes.Length);
}
byte[] newTagBytes = tc.Create(tag, availableRoom-neededRoom).Data;
raf.Write(newTagBytes, 0, newTagBytes.Length);
} else {
//create new tag with padding (we remove the header and keep the audio data)
b = new byte[42];
raf.Read(b, 0, b.Length);
raf.Seek(availableRoom+42, SeekOrigin.Begin);
rafTemp.Write(b, 0, b.Length);
foreach (MetadataBlockData data in metadataBlocks) {
raf.Write(data.Header.Data, 0, data.Header.Data.Length);
raf.Write(data.Bytes, 0, data.Bytes.Length);
}
byte[] newTagBytes = tc.Create(tag, FlacTagCreator.DEFAULT_PADDING).Data;
rafTemp.Write(newTagBytes, 0, newTagBytes.Length);
b = new byte[65536];
int read = raf.Read(b, 0, b.Length);
while (read != 0) {
rafTemp.Write(b, 0, read);
read = raf.Read(b, 0, b.Length);
}
//tempFC.transferFrom( fc, tempFC.position(), fc.size() );
}
}
private OggTag HandleVorbisComment(MetadataBlockHeader mbh, Stream flacStream)
{
long oldPos = flacStream.Position;
OggTag tag = oggTagReader.Read(flacStream);
long newPos = flacStream.Position;
if(newPos - oldPos != mbh.DataLength)
throw new CannotReadException("Tag length do not match with flac comment data length");
return tag;
}
public void Write(Tag tag, Stream raf, Stream rafTemp)
{
//Clean up old datas
ArrayList metadataBlockPadding = new ArrayList(1);
ArrayList metadataBlocks = new ArrayList();
byte[] b = new byte[4];
raf.Read(b, 0, b.Length);
if (new string(System.Text.Encoding.ASCII.GetChars(b)) != "fLaC")
{
throw new CannotWriteException("This is not a FLAC file");
}
bool isLastBlock = false;
while (!isLastBlock)
{
b = new byte[4];
raf.Read(b, 0, 4);
MetadataBlockHeader mbh = new MetadataBlockHeader(b);
if (mbh.BlockType == MetadataBlockHeader.BlockTypes.Padding)
{
raf.Seek(mbh.DataLength, SeekOrigin.Current);
metadataBlockPadding.Add(mbh.DataLength + 4);
}
else
{
b = new byte[mbh.DataLength];
raf.Read(b, 0, b.Length);
metadataBlocks.Add(new MetadataBlockData(mbh, b));
}
isLastBlock = mbh.IsLastBlock;
}
int availableRoom = ComputeAvailableRoom(metadataBlockPadding, metadataBlocks);
int newTagSize = tc.GetTagLength(tag);
int neededRoom = newTagSize + ComputeNeededRoom(metadataBlockPadding, metadataBlocks);
raf.Seek(0, SeekOrigin.Begin);
if (availableRoom >= neededRoom)
{
//OVERWRITE EXISTING TAG
raf.Seek(42, SeekOrigin.Begin);
foreach (MetadataBlockData data in metadataBlocks)
{
raf.Write(data.Header.Data, 0, data.Header.Data.Length);
raf.Write(data.Bytes, 0, data.Bytes.Length);
}
byte[] newTagBytes = tc.Create(tag, availableRoom - neededRoom).Data;
raf.Write(newTagBytes, 0, newTagBytes.Length);
}
else
{
//create new tag with padding (we remove the header and keep the audio data)
b = new byte[42];
raf.Read(b, 0, b.Length);
raf.Seek(availableRoom + 42, SeekOrigin.Begin);
rafTemp.Write(b, 0, b.Length);
foreach (MetadataBlockData data in metadataBlocks)
{
raf.Write(data.Header.Data, 0, data.Header.Data.Length);
raf.Write(data.Bytes, 0, data.Bytes.Length);
}
byte[] newTagBytes = tc.Create(tag, FlacTagCreator.DEFAULT_PADDING).Data;
rafTemp.Write(newTagBytes, 0, newTagBytes.Length);
b = new byte[65536];
int read = raf.Read(b, 0, b.Length);
while (read != 0)
{
rafTemp.Write(b, 0, read);
read = raf.Read(b, 0, b.Length);
}
//tempFC.transferFrom( fc, tempFC.position(), fc.size() );
}
}
