public ByteVector ReadBlock(int length)
{
if (length == 0)
{
return(new ByteVector());
}
try
{
Mode = FileAccessMode.Read;
}
catch (TagLibException)
{
TagLibDebugger.Debug(GetType().ToString() + ".ReadBlock() failed. Invalid File: " + Name);
return(null);
}
if (length > bufferSize && (long)length > Length)
{
length = (int)Length;
}
byte[] buffer = new byte[length];
int count = fileStream.Read(buffer, 0, length);
return(new ByteVector(buffer, count));
}
private void Parse(ByteVector data)
{
// Check to see if a valid Xing header is available.
if (!data.StartsWith("Xing"))
{
return;
}
// If the XingHeader doesn'type contain the number of frames and the total stream
// info it'field invalid.
if ((data[7] & 0x02) == 0)
{
TagLibDebugger.Debug("MPEG::XingHeader::parse() -- Xing header doesn't contain the total number of frames.");
return;
}
if ((data[7] & 0x04) == 0)
{
TagLibDebugger.Debug("MPEG::XingHeader::parse() -- Xing header doesn't contain the total stream size.");
return;
}
frames = data.Mid(8, 4).ToUInt();
size = data.Mid(12, 4).ToUInt();
valid = true;
}
public static OggPage[] Paginate(ByteVectorCollection packets, PaginationStrategy strategy, uint streamSerialNumber,
int firstPage, bool firstPacketContinued, bool lastPacketCompleted, bool containsLastPacket)
{
ArrayList l = new ArrayList();
int totalSize = 0;
foreach (ByteVector b in packets)
{
totalSize += b.Count;
}
if (strategy == PaginationStrategy.Repaginate || totalSize + packets.Count > 255 * 256)
{
TagLibDebugger.Debug("Ogg.Page.Paginate() -- Sorry! Repagination is not yet implemented.");
return((OggPage[])l.ToArray(typeof(OggPage)));
}
// TODO: Handle creation of multiple pages here with appropriate pagination.
OggPage p = new OggPage(packets, streamSerialNumber, firstPage, firstPacketContinued,
lastPacketCompleted, containsLastPacket);
l.Add(p);
return((OggPage[])l.ToArray(typeof(OggPage)));
}
public void Parse(ByteVector data)
{
if (data != null)
{
// 11 buffer is the minimum size for an APE item
if (data.Count < 11)
{
TagLibDebugger.Debug("APE.Item.Parse() -- no data in item");
return;
}
uint value_length = data.Mid(0, 4).ToUInt(false);
uint flags = data.Mid(4, 4).ToUInt(false);
int pos = data.Find(new ByteVector(1), 8);
key = data.Mid(8, pos - 8).ToString(StringType.UTF8);
value = data.Mid(pos + 1, (int)value_length);
ReadOnly = (flags & 1) == 1;
Type = (ApeItemType)((flags >> 1) & 3);
if (Type != ApeItemType.Binary)
{
text.Clear();
text = new StringCollection(ByteVectorCollection.Split(value, (byte)0), StringType.UTF8);
}
}
else
{
throw new ArgumentNullException("data");
}
}
public void SetPacket(uint index, ByteVector packet)
{
while (packetToPageMap.Count <= index)
{
if (!NextPage())
{
TagLibDebugger.Debug("Ogg.File.SetPacket() -- Could not set the requested packet.");
return;
}
}
foreach (int page in (IntCollection)packetToPageMap[(int)index])
{
dirtyPages.SortedInsert(page, true);
}
if (dirtyPackets.ContainsKey(index))
{
dirtyPackets[index] = packet;
}
else
{
dirtyPackets.Add(index, packet);
}
}
protected void Parse(ByteVector data)
{
if (data.Count < Size)
{
return;
}
// do some sanity checking -- even in ID3v2.3.0 and less the tag size is a
// synch-safe integer, so all buffer must be less than 128. If this is not
// true then this is an invalid tag.
// note that we're doing things a little out of order here -- the size is
// later in the bytestream than the version
ByteVector sizeData = data.Mid(6, 4);
if (sizeData.Count != 4)
{
tagSize = 0;
TagLibDebugger.Debug("ID3v2.Header.Parse () - The tag size as read was 0 bytes!");
return;
}
foreach (byte b in sizeData)
{
if (b >= 128)
{
tagSize = 0;
TagLibDebugger.Debug("ID3v2.Header.Parse () - One of the size bytes in the id3v2 header was greater than the allowed 128.");
return;
}
}
// The first three buffer, data[0..2], are the File Identifier, "ID3". (structure 3.1 "file identifier")
// Read the version number from the fourth and fifth buffer.
majorVersion = data[3]; // (structure 3.1 "major version")
revisionNumber = data[4]; // (structure 3.1 "revision number")
// Read the flags, the first four bits of the sixth byte.
byte flags = data[5];
desynchronization = ((flags >> 7) & 1) == 1; // (structure 3.1.a)
extendedHeader = ((flags >> 6) & 1) == 1; // (structure 3.1.b)
experimentalIndicator = ((flags >> 5) & 1) == 1; // (structure 3.1.channelMode)
footerPresent = ((flags >> 4) & 1) == 1; // (structure 3.1.d)
// Get the size from the remaining four buffer (read above)
tagSize = Id3v2SynchData.ToUInt(sizeData); // (structure 3.1 "size")
}
private void ParsePrivateFields(ByteVector data)
{
if (data.Count < 1)
{
TagLibDebugger.Debug("A private frame must contain at least 1 byte.");
return;
}
ByteVectorCollection list = ByteVectorCollection.Split(data, TextDelimiter(StringType.Latin1), 1, 2);
if (list.Count == 2)
{
owner = list[0].ToString(StringType.Latin1);
data = list[1];
}
}
//private void Read(ByteVector data, long streamLength, ReadStyle style)
private void Read(ByteVector data, long streamLength)
{
if (data.Count < 18)
{
TagLibDebugger.Debug("FLAC.Properties.Read() - FLAC properties must contain at least 18 bytes.");
return;
}
int pos = 0;
// Minimum block size (in samples)
pos += 2;
// Maximum block size (in samples)
pos += 2;
// Minimum frame size (in buffer)
pos += 3;
// Maximum frame size (in buffer)
pos += 3;
uint flags = data.Mid(pos, 4).ToUInt(true);
sampleRate = (int)(flags >> 12);
channels = (int)(((flags >> 9) & 7) + 1);
sampleWidth = (int)(((flags >> 4) & 31) + 1);
// The last 4 bits are the most significant 4 bits for the 36 bit
// stream length in samples. (Audio files measured in days)
double high_length = (double)(sampleRate > 0 ? (((flags & 0xf) << 28) / sampleRate) << 4 : 0);
pos += 4;
duration = sampleRate > 0 ? TimeSpan.FromSeconds((double)data.Mid(pos, 4).ToUInt(true) / (double)sampleRate + high_length) : TimeSpan.Zero;
pos += 4;
// Uncompressed bitrate:
//bitrate = ((sampleRate * channels) / 1000) * sample_width;
// Real bitrate:
bitrate = (int)(duration > TimeSpan.Zero ? ((streamLength * 8L) / duration.TotalSeconds) / 1000 : 0);
}
//////////////////////////////////////////////////////////////////////////
// private methods
//////////////////////////////////////////////////////////////////////////
private void Read(ReadStyle propertiesStyle)
{
ByteVector comment_header_data = GetPacket(1);
if (comment_header_data.Mid(0, 7) != vorbis_comment_header_id)
{
TagLibDebugger.Debug("Vorbis.File.Read() - Could not find the Vorbis comment header.");
SetValid(false);
return;
}
comment = new OggXiphComment(comment_header_data.Mid(7));
if (propertiesStyle != ReadStyle.None)
{
properties = new OggVorbisProperties(this, propertiesStyle);
}
}
protected void Read()
{
if (file != null && file.IsValid)
{
file.Seek(tagOffset);
// read the tag -- always 128 buffer
ByteVector data = file.ReadBlock(128);
// some initial sanity checking
if (data.Count == 128 && data.StartsWith(FileIdentifier)) //"TAG"))
{
Parse(data);
}
else
{
TagLibDebugger.Debug("ID3v1 tag is not valid or could not be read at the specified offset.");
}
}
}
public void WriteBlock(ByteVector data)
{
if (data != null)
{
try
{
Mode = FileAccessMode.Write;
}
catch (TagLibException)
{
TagLibDebugger.Debug(GetType().ToString() + ".WriteBlock () failed. Read-only File: " + Name);
return;
}
fileStream.Write(data.GetDataBuffer(), 0, data.Count);
}
else
{
throw new ArgumentNullException("data");
}
}
// Overwrite the box'field header with a new header incorporating a size
// change.
public virtual void OverwriteHeader(long sizeChange)
{
// If we don'type have a header we can'type do anything.
if (header == null || header.Position < 0)
{
TagLibDebugger.Debug("Box.OverWriteHeader() - No header to overwrite.");
return;
}
// Make sure this alteration won'type screw up the reading of children.
LoadChildren();
// Save the header'field original position and size.
long position = header.Position;
long oldSize = header.HeaderSize;
// Update the data size.
header.DataSize = (ulong)((long)header.DataSize + sizeChange);
// Render the header onto the file.
File.Insert(header.Render(), position, oldSize);
}
public ByteVector Render()
{
ByteVector data = header.Render();
if (packets.IsEmpty)
{
if (file != null)
{
file.Seek(packetOffset);
data.Add(file.ReadBlock(dataSize));
}
else
{
TagLibDebugger.Debug("Ogg.Page.Render() -- this page is empty!");
}
}
else
{
foreach (ByteVector v in packets)
{
data.Add(v);
}
}
// Compute and set the checksum for the Ogg page. The checksum is taken over
// the entire page with the 4 buffer reserved for the checksum zeroed and then
// inserted in buffer 22-25 of the page header.
ByteVector checksum = ByteVector.FromUInt(data.Checksum, false);
for (int i = 0; i < 4; i++)
{
data [i + 22] = checksum [i];
}
return(data);
}
private void ParseCommentsFields(ByteVector data)
{
if (data.Count < 5)
{
TagLibDebugger.Debug("A comment frame must contain at least 5 bytes.");
return;
}
textEncoding = (StringType)data[0];
language = data.Mid(1, 3);
int byte_align = textEncoding == StringType.Latin1 || textEncoding == StringType.UTF8 ? 1 : 2;
ByteVectorCollection l = ByteVectorCollection.Split(data.Mid(4), TextDelimiter(textEncoding), byte_align, 2);
if (l.Count == 2)
{
if (l[0].Data != null && l[0].Data.Count > 0)
{
description = l[0].ToString(textEncoding);
}
else
{
description = string.Empty;
}
if (l[1].Data != null && l[1].Data.Count > 0)
{
text = l[1].ToString(textEncoding);
}
else
{
text = string.Empty;
}
}
}
//private void Read(OggVorbisFile file, ReadStyle style)
private void Read(OggVorbisFile file)
{
// Get the identification header from the Ogg implementation.
ByteVector data = file.GetPacket(0);
int pos = 0;
if (data.Mid(pos, 7) != vorbisCommentHeaderId)
{
TagLibDebugger.Debug("Vorbis.Properties.Read() -- invalid Vorbis identification header");
return;
}
pos += 7;
vorbisVersion = (int)data.Mid(pos, 4).ToUInt(false);
pos += 4;
channels = data[pos];
pos += 1;
sampleRate = (int)data.Mid(pos, 4).ToUInt(false);
pos += 4;
bitrateMaximum = (int)data.Mid(pos, 4).ToUInt(false);
pos += 4;
bitrateNominal = (int)data.Mid(pos, 4).ToUInt(false);
pos += 4;
bitrateMinimum = (int)data.Mid(pos, 4).ToUInt(false);
// TODO: Later this should be only the "fast" mode.
bitrate = bitrateNominal;
// Find the length of the file. See http://wiki.xiph.org/VorbisStreamLength/
// for my notes on the topic.
OggPageHeader first = file.FirstPageHeader;
OggPageHeader last = file.LastPageHeader;
if (first != null && last != null)
{
long start = first.AbsoluteGranularPosition;
long end = last.AbsoluteGranularPosition;
if (start >= 0 && end >= 0 && sampleRate > 0)
{
duration = TimeSpan.FromSeconds(((double)(end - start) / (double)sampleRate));
}
else
{
TagLibDebugger.Debug("Vorbis.Properties.Read() -- Either the PCM " +
"values for the start or end of this file was " +
"incorrect or the sample rate is zero.");
}
}
else
{
TagLibDebugger.Debug("Vorbis.Properties.Read() -- Could not find valid first and last Ogg pages.");
}
}
public void Save(TagTypes types, bool stripOthers)
{
if (types == TagTypes.None && stripOthers)
{
if (!Strip(TagTypes.AllTags))
{
throw new TagLibException(TagLibError.MpegCouldNotStripTags);
}
return;
}
if (id3v2_tag == null && id3v1_tag == null && ape_tag == null)
{
if (stripOthers)
{
if (!Strip(TagTypes.AllTags))
{
throw new TagLibException(TagLibError.MpegCouldNotStripTags);
}
}
return;
}
if (IsReadOnly)
{
throw new ReadOnlyException();
}
Mode = FileAccessMode.Write;
// Create the tags if we've been asked to. Copy the values from the tag that
// does exist into the new tag.
if ((types & TagTypes.Id3v2) != 0 && id3v1_tag != null)
{
TagLib.Tag.Duplicate(id3v1_tag, FindTag(TagTypes.Id3v2, true), false);
}
if ((types & TagTypes.Id3v1) != 0 && id3v2_tag != null)
{
TagLib.Tag.Duplicate(id3v2_tag, FindTag(TagTypes.Id3v1, true), false);
}
bool success = true;
if ((TagTypes.Id3v2 & types) != 0 && id3v2_tag != null && !id3v2_tag.IsEmpty)
{
long id3v2_location = FindId3v2();
int id3v2_size = 0;
if (id3v2_location < 0)
{
id3v2_location = 0;
}
else
{
Seek(id3v2_location);
Id3v2Header header = new Id3v2Header(ReadBlock((int)Id3v2Header.Size));
if (header.TagSize == 0)
{
TagLibDebugger.Debug("Mpc.File.Save() -- Id3v2 header is broken. Ignoring.");
}
else
{
id3v2_size = (int)header.CompleteTagSize;
}
}
Insert(id3v2_tag.Render(), id3v2_location, id3v2_size);
}
else if (stripOthers)
{
success = Strip(TagTypes.Id3v2) && success;
}
if ((TagTypes.Id3v1 & types) != 0 && id3v1_tag != null && !id3v1_tag.IsEmpty)
{
long id3v1_location = FindId3v1();
if (id3v1_location < 0)
{
Seek(0, System.IO.SeekOrigin.End);
}
else
{
Seek(id3v1_location);
}
WriteBlock(id3v1_tag.Render());
}
else if (stripOthers)
{
success = (Strip(TagTypes.Id3v1, false) && success);
}
// Dont save an APE-tag unless one has been created
if ((TagTypes.Ape & types) != 0 && ape_tag != null && !ape_tag.IsEmpty)
{
long ape_location = FindApe(FindId3v1() >= 0);
long ape_size = 0;
if (ape_location < 0)
{
ape_location = Length;
}
else
{
Seek(ape_location);
ape_size = (new ApeFooter(ReadBlock((int)ApeFooter.Size))).CompleteTagSize;
ape_location = ape_location + ApeFooter.Size - ape_size;
}
Insert(ape_tag.Render(), ape_location, ape_size);
}
else if (stripOthers)
{
success = (Strip(TagTypes.Ape, false) && success);
}
Mode = FileAccessMode.Closed;
if (!success)
{
throw new TagLibException(TagLibError.MpegCouldNotWriteTags);
}
}
private void Parse(ByteVector data)
{
if (data.Count < 4 || data[0] != 0xff)
{
TagLibDebugger.Debug("Mpeg.Header.Parse() -- First byte did not match MPEG synch.");
return;
}
uint flags = data.ToUInt();
// Check for the second byte'field part of the MPEG synch
if ((flags & 0xFFE00000) != 0xFFE00000)
{
TagLibDebugger.Debug("Mpeg.Header.Parse() -- Second byte did not match MPEG synch.");
return;
}
// Set the MPEG version
switch ((flags >> 19) & 0x03)
{
case 0: version = MpegVersion.TwoPointFive; break;
case 2: version = MpegVersion.Two; break;
case 3: version = MpegVersion.One; break;
}
// Set the MPEG layer
switch ((flags >> 17) & 0x03)
{
case 1: layer = 3; break;
case 2: layer = 2; break;
case 3: layer = 1; break;
}
protectionEnabled = ((flags >> 16) & 1) == 0;
// Set the bitrate
int[, ,] bitrates = new int[2, 3, 16] {
{ // Version 1
{ 0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448, 0 }, // layer 1
{ 0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384, 0 }, // layer 2
{ 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 0 } // layer 3
},
{ // Version 2 or 2.5
{ 0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256, 0 }, // layer 1
{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0 }, // layer 2
{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0 } // layer 3
}
};
int versionIndex = version == MpegVersion.One ? 0 : 1;
int layerIndex = layer > 0 ? layer - 1 : 0;
// The bitrate index is encoded as the first 4 bits of the 3rd byte,
// index.e. 1111xxxx
int i = (int)(flags >> 12) & 0x0F;
bitrate = bitrates[versionIndex, layerIndex, i];
// Set the sample rate
int[,] sampleRates = new int[3, 4] {
{ 44100, 48000, 32000, 0 }, // Version 1
{ 22050, 24000, 16000, 0 }, // Version 2
{ 11025, 12000, 8000, 0 } // Version 2.5
};
// The sample rate index is encoded as two bits in the 3nd byte,
// index.e. xxxx11xx
i = (int)(flags >> 10) & 0x03;
sampleRate = sampleRates[(int)version, i];
if (sampleRate == 0)
{
TagLibDebugger.Debug("Mpeg.Header.Parse() -- Invalid sample rate.");
return;
}
// The channel mode is encoded as a 2 bit value at the end of the 3nd
// byte, index.e. xxxxxx11
channelMode = (MpegChannelMode)((flags >> 16) & 0x3);
// TODO: Add mode extension for completeness
isCopyrighted = (flags & 1) == 1;
isOriginal = ((flags >> 1) & 1) == 1;
// Calculate the frame length
if (layer == 1)
{
frameLength = 24000 * 2 * bitrate / sampleRate + (IsPadded ? 1 : 0);
}
else
{
frameLength = 72000 * bitrate / sampleRate + (IsPadded ? 1 : 0);
}
// Now that we're done parsing, set this to be a valid frame.
isValid = true;
}
public ByteVector GetPacket(uint index)
{
// Check to see if we're called setPacket() for this packet since the last
// save:
if (dirtyPackets.ContainsKey(index))
{
return(dirtyPackets[index]);
}
// If we haven'type indexed the page where the packet we're interested in starts,
// begin reading pages until we have.
while (packetToPageMap.Count <= index)
{
if (!NextPage())
{
TagLibDebugger.Debug("Ogg.File.Packet() -- Could not find the requested packet.");
return(null);
}
}
// Start reading at the first page that contains part (or all) of this packet.
// If the last read stopped at the packet that we're interested in, don'type
// reread its packet text. (This should make sequential packet reads fast.)
int pageIndex = ((IntCollection)packetToPageMap[(int)index])[0];
if (currentPacketPage != pages[pageIndex])
{
currentPacketPage = pages[pageIndex];
currentPackets = currentPacketPage.Packets;
}
// If the packet is completely contained in the first page that it'field in, then
// just return it now.
if ((currentPacketPage.ContainsPacket((int)index) & ContainsPacketSettings.CompletePacket) != 0)
{
return(currentPackets[(int)(index - currentPacketPage.FirstPacketIndex)]);
}
// If the packet is *not* completely contained in the first page that it'field a
// part of then that packet trails off the end of the page. Continue appending
// the pages' packet data until we hit a page that either does not end with the
// packet that we're fetching or where the last packet is complete.
ByteVector packet = currentPackets[currentPackets.Count - 1];
while ((currentPacketPage.ContainsPacket((int)index) & ContainsPacketSettings.EndsWithPacket) != 0 &&
!currentPacketPage.Header.LastPacketCompleted)
{
pageIndex++;
if (pageIndex == pages.Count && !NextPage())
{
TagLibDebugger.Debug("Ogg.File.Packet() -- Could not find the requested packet.");
return(null);
}
currentPacketPage = (OggPage)pages[pageIndex];
currentPackets = currentPacketPage.Packets;
packet.Add(currentPackets[0]);
}
return(packet);
}
private static bool UpdateFrame(Id3v2FrameHeader header)
{
ByteVector frameId = header.FrameId;
switch (header.Version)
{
case 2: // ID3v2.2
{
if (frameId == "CRM" ||
frameId == "EQU" ||
frameId == "LNK" ||
frameId == "RVA" ||
frameId == "TIM" ||
frameId == "TSI")
{
TagLibDebugger.Debug("ID3v2.4 no longer supports the frame type "
+ frameId.ToString() + ". It will be discarded from the tag.");
return(false);
}
// ID3v2.2 only used 3 buffer for the frame ID, so we need to convert all of
// the frames to their 4 byte ID3v2.4 equivalent.
ConvertFrame("BUF", "RBUF", header);
ConvertFrame("CNT", "PCNT", header);
ConvertFrame("COM", "COMM", header);
ConvertFrame("CRA", "AENC", header);
ConvertFrame("ETC", "ETCO", header);
ConvertFrame("GEO", "GEOB", header);
ConvertFrame("IPL", "TIPL", header);
ConvertFrame("MCI", "MCDI", header);
ConvertFrame("MLL", "MLLT", header);
ConvertFrame("PIC", "APIC", header);
ConvertFrame("POP", "POPM", header);
ConvertFrame("REV", "RVRB", header);
ConvertFrame("SLT", "SYLT", header);
ConvertFrame("STC", "SYTC", header);
ConvertFrame("TAL", "TALB", header);
ConvertFrame("TBP", "TBPM", header);
ConvertFrame("TCM", "TCOM", header);
ConvertFrame("TCO", "TCON", header);
ConvertFrame("TCR", "TCOP", header);
ConvertFrame("TDA", "TDRC", header);
ConvertFrame("TDY", "TDLY", header);
ConvertFrame("TEN", "TENC", header);
ConvertFrame("TFT", "TFLT", header);
ConvertFrame("TKE", "TKEY", header);
ConvertFrame("TLA", "TLAN", header);
ConvertFrame("TLE", "TLEN", header);
ConvertFrame("TMT", "TMED", header);
ConvertFrame("TOA", "TOAL", header);
ConvertFrame("TOF", "TOFN", header);
ConvertFrame("TOL", "TOLY", header);
ConvertFrame("TOR", "TDOR", header);
ConvertFrame("TOT", "TOAL", header);
ConvertFrame("TP1", "TPE1", header);
ConvertFrame("TP2", "TPE2", header);
ConvertFrame("TP3", "TPE3", header);
ConvertFrame("TP4", "TPE4", header);
ConvertFrame("TPA", "TPOS", header);
ConvertFrame("TPB", "TPUB", header);
ConvertFrame("TRC", "TSRC", header);
ConvertFrame("TRD", "TDRC", header);
ConvertFrame("TRK", "TRCK", header);
ConvertFrame("TSS", "TSSE", header);
ConvertFrame("TT1", "TIT1", header);
ConvertFrame("TT2", "TIT2", header);
ConvertFrame("TT3", "TIT3", header);
ConvertFrame("TXT", "TOLY", header);
ConvertFrame("TXX", "TXXX", header);
ConvertFrame("TYE", "TDRC", header);
ConvertFrame("UFI", "UFID", header);
ConvertFrame("ULT", "USLT", header);
ConvertFrame("WAF", "WOAF", header);
ConvertFrame("WAR", "WOAR", header);
ConvertFrame("WAS", "WOAS", header);
ConvertFrame("WCM", "WCOM", header);
ConvertFrame("WCP", "WCOP", header);
ConvertFrame("WPB", "WPUB", header);
ConvertFrame("WXX", "WXXX", header);
}
break;
case 3: // ID3v2.3
{
if (frameId == "EQUA" ||
frameId == "RVAD" ||
frameId == "TIME" ||
frameId == "TRDA" ||
frameId == "TSIZ" ||
frameId == "TDAT")
{
TagLibDebugger.Debug("ID3v2.4 no longer supports the frame type "
+ frameId.ToString() + ". It will be discarded from the tag.");
return(false);
}
ConvertFrame("TORY", "TDOR", header);
ConvertFrame("TYER", "TDRC", header);
}
break;
default:
{
// This should catch a typo that existed in TagLib up to and including
// version 1.1 where TRDC was used for the year rather than TDRC.
ConvertFrame("TRDC", "TDRC", header);
}
break;
}
return(true);
}
//////////////////////////////////////////////////////////////////////////
// private methods
//////////////////////////////////////////////////////////////////////////
private void Read()
{
// Since we've likely just looked for the ID3v1 tag, start at the end of the
// file where we're least likely to have to have to move the disk head.
long last = file.LastFrameOffset;
if (last < 0)
{
TagLibDebugger.Debug("Mpeg.Properties.Read() -- Could not find a valid last MPEG frame in the stream.");
return;
}
file.Seek(last);
MpegHeader last_header = new MpegHeader(file.ReadBlock(4));
long first = file.FirstFrameOffset;
if (first < 0)
{
TagLibDebugger.Debug("Mpeg.Properties.Read() -- Could not find a valid first MPEG frame in the stream.");
return;
}
if (!last_header.IsValid)
{
long pos = last;
while (pos > first)
{
pos = file.PreviousFrameOffset(pos);
if (pos < 0)
{
break;
}
file.Seek(pos);
MpegHeader header = new MpegHeader(file.ReadBlock(4));
if (header.IsValid)
{
last_header = header;
last = pos;
break;
}
}
}
// Now jump back to the front of the file and read what we need from there.
file.Seek(first);
MpegHeader first_header = new MpegHeader(file.ReadBlock(4));
if (!first_header.IsValid || !last_header.IsValid)
{
TagLibDebugger.Debug("Mpeg.Properties.Read() -- Page headers were invalid.");
return;
}
// Check for a Xing header that will help us in gathering information about a
// VBR stream.
int xing_header_offset = MpegXingHeader.XingHeaderOffset(first_header.Version,
first_header.ChannelMode);
file.Seek(first + xing_header_offset);
MpegXingHeader xing_header = new MpegXingHeader(file.ReadBlock(16));
// Read the length and the bitrate from the Xing header.
if (xing_header.IsValid && first_header.SampleRate > 0 && xing_header.TotalFrames > 0)
{
int [] block_size = { 0, 384, 1152, 1152 };
double time_per_frame = block_size [first_header.Layer];
time_per_frame = first_header.SampleRate > 0 ? time_per_frame / first_header.SampleRate : 0;
duration = new TimeSpan((int)(time_per_frame * xing_header.TotalFrames) * TimeSpan.TicksPerSecond);
bitrate = (int)(duration > TimeSpan.Zero ? ((xing_header.TotalSize * 8L) / duration.TotalSeconds) / 1000 : 0);
}
// Since there was no valid Xing header found, we hope that we're in a constant
// bitrate file.
// TODO: Make this more robust with audio property detection for VBR without a
// Xing header.
else if (first_header.FrameLength > 0 && first_header.Bitrate > 0)
{
int frames = (int)((last - first) / first_header.FrameLength + 1);
duration = TimeSpan.FromSeconds((double)(first_header.FrameLength * frames) / (double)(first_header.Bitrate * 125) + 0.5);
bitrate = first_header.Bitrate;
}
sample_rate = first_header.SampleRate;
channels = first_header.ChannelMode == MpegChannelMode.SingleChannel ? 1 : 2;
version = first_header.Version;
layer = first_header.Layer;
channel_mode = first_header.ChannelMode;
is_copyrighted = first_header.IsCopyrighted;
is_original = first_header.IsOriginal;
}
public override void Save()
{
if (IsReadOnly)
{
throw new ReadOnlyException();
}
Mode = FileAccessMode.Write;
long flac_data_begin;
long flac_data_end;
// Update ID3 tags
if (id3v2_tag != null)
{
ByteVector id3v2_tag_data = id3v2_tag.Render();
long id3v2_location = FindId3v2();
if (id3v2_location >= 0)
{
int id3v2_size = 0;
Seek(id3v2_location);
Id3v2Header header = new Id3v2Header(ReadBlock((int)Id3v2Header.Size));
if (header.TagSize == 0)
{
TagLibDebugger.Debug("Flac.File.Save() -- Id3v2 header is broken. Ignoring.");
}
else
{
id3v2_size = (int)header.CompleteTagSize;
}
Insert(id3v2_tag_data, id3v2_location, id3v2_size);
System.Console.WriteLine("ID3v2: " + id3v2_size + " " + id3v2_tag_data.Count);
flac_data_begin = id3v2_location + id3v2_tag_data.Count;
}
else
{
Insert(id3v2_tag_data, 0, 0);
flac_data_begin = id3v2_tag_data.Count;
}
}
else
{
flac_data_begin = 0;
}
if (id3v1_tag != null)
{
long id3v1_location = FindId3v1();
if (id3v1_location >= 0)
{
Seek(id3v1_location);
}
else
{
Seek(0, System.IO.SeekOrigin.End);
}
flac_data_end = Tell;
WriteBlock(id3v1_tag.Render());
}
else
{
flac_data_end = Length;
}
// Create new vorbis comments is they don'type exist.
FindTag(TagTypes.Xiph, true);
xiph_comment_data = comment.Render(false);
ByteVector v = ByteVector.FromUInt((uint)xiph_comment_data.Count);
// Set the type of the comment to be a Xiph / Vorbis comment
// (See scan() for comments on header-format)
v[0] = 4;
v.Add(xiph_comment_data);
// If file already have comment => find and update it
// if not => insert one
scanned = false;
if (Scan(flac_data_begin, flac_data_end) != null)
{
long next_page_offset = flac_start;
Seek(next_page_offset);
ByteVector header = ReadBlock(4);
uint length = header.Mid(1, 3).ToUInt();
next_page_offset += length + 4;
// Search through the remaining metadata
byte block_type = (byte)(header[0] & 0x7f);
bool last_block = (header[0] & 0x80) != 0;
while (!last_block)
{
Seek(next_page_offset);
header = ReadBlock(4);
block_type = (byte)(header[0] & 0x7f);
last_block = (header[0] & 0x80) != 0;
length = header.Mid(1, 3).ToUInt();
// Type is vorbiscomment
if (block_type == 4)
{
long next_keep = (last_block ? 0 : FindPaddingBreak(next_page_offset + length + 4,
next_page_offset + XiphCommentData.Count + 8,
ref last_block));
uint padding_length;
if (next_keep != 0)
{
// There is space for comment and padding blocks without rewriting the whole file.
// Note this can not overflow.
padding_length = (uint)(next_keep - (next_page_offset + XiphCommentData.Count + 8));
}
else
{
// Not enough space, so we will have to rewrite the whole file following this block
padding_length = (uint)XiphCommentData.Count;
if (padding_length < 4096)
{
padding_length = 4096;
}
next_keep = next_page_offset + length + 4;
}
ByteVector padding = ByteVector.FromUInt(padding_length);
padding[0] = 1;
if (last_block)
{
padding[0] = (byte)(padding[0] | 0x80);
}
padding.Resize((int)(padding_length + 4));
Insert(v + padding, next_page_offset, next_keep - next_page_offset);
//System.Console.WriteLine ("OGG: " + (next_keep - next_page_offset) + " " + (vector.Count + padding.Count));
break;
}
next_page_offset += length + 4;
}
}
else
{
long next_page_offset = flac_start;
Seek(next_page_offset);
ByteVector header = ReadBlock(4);
bool last_block = (header[0] & 0x80) != 0;
uint length = header.Mid(1, 3).ToUInt();
// If last block was last, make this one last
if (last_block)
{
// Copy the bottom seven bits into the new value
ByteVector h = (byte)(header[0] & 0x7F);
Insert(h, next_page_offset, 1);
// Set the last bit
v[0] = (byte)(v[0] | 0x80);
}
Insert(v, next_page_offset + length + 4, 0);
}
Mode = FileAccessMode.Closed;
}
private ByteVector Scan(long begin, long end)
{
ByteVector xiph_comment_data = null;
// Scan the metadata pages
if (scanned || !IsValid)
{
return(null);
}
long next_page_offset;
long file_size = Length;
next_page_offset = Find("fLaC", begin);
if (next_page_offset < 0)
{
TagLibDebugger.Debug("Flac.File.Scan () -- FLAC stream not found");
SetValid(false);
return(null);
}
next_page_offset += 4;
flac_start = next_page_offset;
Seek(next_page_offset);
ByteVector header = ReadBlock(4);
// Header format (from spec):
// <1> Last-metadata-block flag
// <7> BLOCK_TYPE
// 0 : STREAMINFO
// 1 : PADDING
// ..
// 4 : VORBIS_COMMENT
// ..
// <24> Length of metadata to follow
byte block_type = (byte)(header[0] & 0x7f);
bool last_block = (header[0] & 0x80) != 0;
uint length = header.Mid(1, 3).ToUInt();
// First block should be the stream_info metadata
if (block_type != 0)
{
TagLibDebugger.Debug("Flac.File.Scan() -- invalid FLAC stream");
SetValid(false);
return(null);
}
stream_info_data = ReadBlock((int)length);
next_page_offset += length + 4;
// Search through the remaining metadata
while (!last_block)
{
header = ReadBlock(4);
block_type = (byte)(header[0] & 0x7f);
last_block = (header[0] & 0x80) != 0;
length = header.Mid(1, 3).ToUInt();
// Found the vorbis-comment
if (block_type == 4)
{
xiph_comment_data = ReadBlock((int)length);
}
next_page_offset += length + 4;
if (next_page_offset >= file_size)
{
TagLibDebugger.Debug("Flac.File.Scan() -- FLAC stream corrupted");
SetValid(false);
return(null);
}
Seek(next_page_offset);
}
// End of metadata, now comes the datastream
stream_start = next_page_offset;
stream_length = end - stream_start;
scanned = true;
return(xiph_comment_data);
}
public void SetData(ByteVector data, uint version)
{
if (data != null)
{
this.version = version;
if (version < 3)
{
// ID3v2.2
if (data.Count < 3)
{
TagLibDebugger.Debug("You must at least specify a frame ID.");
return;
}
// Set the frame ID -- the first three buffer
frameId = data.Mid(0, 3);
// If the full header information was not passed in, do not continue to the
// steps to parse the frame size and flags.
if (data.Count < 6)
{
frameSize = 0;
return;
}
frameSize = data.Mid(3, 3).ToUInt();
}
else if (version == 3)
{
// ID3v2.3
if (data.Count < 4)
{
TagLibDebugger.Debug("You must at least specify a frame ID.");
return;
}
// Set the frame ID -- the first four buffer
frameId = data.Mid(0, 4);
// If the full header information was not passed in, do not continue to the
// steps to parse the frame size and flags.
if (data.Count < 10)
{
frameSize = 0;
return;
}
// Set the size -- the frame size is the four buffer starting at byte four in
// the frame header (structure 4)
frameSize = data.Mid(4, 4).ToUInt();
// read the first byte of flags
tagAlterPreservation = ((data[8] >> 7) & 1) == 1; // (structure 3.3.1.a)
fileAlterPreservation = ((data[8] >> 6) & 1) == 1; // (structure 3.3.1.b)
readOnly = ((data[8] >> 5) & 1) == 1; // (structure 3.3.1.channelMode)
// read the second byte of flags
compression = ((data[9] >> 7) & 1) == 1; // (structure 3.3.1.index)
encryption = ((data[9] >> 6) & 1) == 1; // (structure 3.3.1.j)
groupingIdentity = ((data[9] >> 5) & 1) == 1; // (structure 3.3.1.k)
}
else
{
// ID3v2.4
if (data.Count < 4)
{
TagLibDebugger.Debug("You must at least specify a frame ID.");
return;
}
// Set the frame ID -- the first four buffer
frameId = data.Mid(0, 4);
// If the full header information was not passed in, do not continue to the
// steps to parse the frame size and flags.
if (data.Count < 10)
{
frameSize = 0;
return;
}
// Set the size -- the frame size is the four buffer starting at byte four in
// the frame header (structure 4)
frameSize = Id3v2SynchData.ToUInt(data.Mid(4, 4));
// read the first byte of flags
tagAlterPreservation = ((data[8] >> 6) & 1) == 1; // (structure 4.1.1.a)
fileAlterPreservation = ((data[8] >> 5) & 1) == 1; // (structure 4.1.1.b)
readOnly = ((data[8] >> 4) & 1) == 1; // (structure 4.1.1.channelMode)
// read the second byte of flags
groupingIdentity = ((data[9] >> 6) & 1) == 1; // (structure 4.1.2.header)
compression = ((data[9] >> 3) & 1) == 1; // (structure 4.1.2.k)
encryption = ((data[9] >> 2) & 1) == 1; // (structure 4.1.2.m)
desynchronization = ((data[9] >> 1) & 1) == 1; // (structure 4.1.2.n)
dataLengthIndicator = (data[9] & 1) == 1; // (structure 4.1.2.position)
}
}
else
{
throw new ArgumentNullException("data");
}
}
public override void Save()
{
if (IsReadOnly)
{
throw new ReadOnlyException();
}
Mode = FileAccessMode.Write;
// Update ID3v2 tag
long id3v2_location = FindId3v2();
int id3v2_size = 0;
if (id3v2_location != -1)
{
Seek(id3v2_location);
Id3v2Header header = new Id3v2Header(ReadBlock((int)Id3v2Header.Size));
if (header.TagSize == 0)
{
TagLibDebugger.Debug("Mpc.File.Save() -- Id3v2 header is broken. Ignoring.");
id3v2_location = -1;
}
else
{
id3v2_size = (int)header.CompleteTagSize;
}
}
if (id3v2Tag != null)
{
if (id3v2_location >= 0)
{
Insert(id3v2Tag.Render(), id3v2_location, id3v2_size);
}
else
{
Insert(id3v2Tag.Render(), 0, 0);
}
}
else if (id3v2_location >= 0)
{
RemoveBlock(id3v2_location, id3v2_size);
}
// Update ID3v1 tag
long id3v1_location = FindId3v1();
if (id3v1Tag != null)
{
if (id3v1_location >= 0)
{
Insert(id3v1Tag.Render(), id3v1_location, 128);
}
else
{
Seek(0, System.IO.SeekOrigin.End);
id3v1_location = Tell;
WriteBlock(id3v1Tag.Render());
}
}
else if (id3v1_location >= 0)
{
RemoveBlock(id3v1_location, 128);
id3v1_location = -1;
}
// Update APE tag
long ape_location = FindApe(id3v1_location != -1);
long ape_size = 0;
if (ape_location >= 0)
{
Seek(ape_location);
ape_size = (new ApeFooter(ReadBlock((int)ApeFooter.Size))).CompleteTagSize;
ape_location = ape_location + ApeFooter.Size - ape_size;
}
if (apeTag != null)
{
if (ape_location >= 0)
{
Insert(apeTag.Render(), ape_location, ape_size);
}
else
{
if (id3v1_location >= 0)
{
Insert(apeTag.Render(), id3v1_location, 0);
}
else
{
Seek(0, System.IO.SeekOrigin.End);
WriteBlock(apeTag.Render());
}
}
}
else if (ape_location >= 0)
{
RemoveBlock(ape_location, ape_size);
}
Mode = FileAccessMode.Closed;
}
private void Read(OggFile file, long file_offset)
{
file.Seek(file_offset);
// An Ogg page header is at least 27 buffer, so we'll go ahead and read that
// much and then get the rest when we're ready for it.
ByteVector data = file.ReadBlock(27);
// Sanity check -- make sure that we were in fact able to read as much data as
// we asked for and that the page begins with "OggS".
if (data.Count != 27 || !data.StartsWith("OggS"))
{
TagLibDebugger.Debug("Ogg.PageHeader.Read() -- error reading page header");
return;
}
byte flags = data[5];
firstPacketContinued = (flags & 1) != 0;
firstPageOfStream = ((flags >> 1) & 1) != 0;
lastPageOfStream = ((flags >> 2) & 1) != 0;
absoluteGranularPosition = data.Mid(6, 8).ToLong(false);
streamSerialNumber = data.Mid(14, 4).ToUInt(false);
pageSequenceNumber = (int)data.Mid(18, 4).ToUInt(false);
// Byte number 27 is the number of page segments, which is the only variable
// length portion of the page header. After reading the number of page
// segments we'll then read in the coresponding data for this count.
int pageSegmentCount = data[26];
ByteVector page_segments = file.ReadBlock(pageSegmentCount);
// Another sanity check.
if (pageSegmentCount < 1 || page_segments.Count != pageSegmentCount)
{
return;
}
// The base size of an Ogg page 27 buffer plus the number of lacing values.
size = 27 + pageSegmentCount;
int packetSize = 0;
for (int i = 0; i < pageSegmentCount; i++)
{
dataSize += page_segments[i];
packetSize += page_segments[i];
if (page_segments[i] < 255)
{
packetSizes.Add(packetSize);
packetSize = 0;
}
}
if (packetSize > 0)
{
packetSizes.Add(packetSize);
lastPacketCompleted = false;
}
else
{
lastPacketCompleted = true;
}
isValid = true;
}
protected void Parse(ByteVector data)
{
if (data != null)
{
try
{
int frameDataPosition = 0;
int frameDataLength = data.Count;
// check for extended header
if (header.ExtendedHeader)
{
if (ExtendedHeader == null)
{
extendedHeader = new Id3v2ExtendedHeader();
}
ExtendedHeader.SetData(data);
if (ExtendedHeader.Size <= data.Count)
{
frameDataPosition += (int)ExtendedHeader.Size;
frameDataLength -= (int)ExtendedHeader.Size;
}
}
// check for footer -- we don'type actually need to parse it, as it *must*
// contain the same data as the header, but we do need to account for its
// size.
if (header.FooterPresent && Id3v2Footer.Size <= frameDataLength)
{
frameDataLength -= (int)Id3v2Footer.Size;
}
// parse frames
// Make sure that there is at least enough room in the remaining frame data for
// a frame header.
while (frameDataPosition < frameDataLength - Id3v2FrameHeader.Size(header.MajorVersion))
{
// If the next data is position is 0, assume that we've hit the padding
// portion of the frame data.
if (data[frameDataPosition] == 0)
{
if (header.FooterPresent)
{
TagLibDebugger.Debug("Padding *and* a footer found. This is not allowed by the spec.");
}
return;
}
Id3v2Frame frame = Id3v2FrameFactory.CreateFrame(data.Mid(frameDataPosition), header.MajorVersion);
if (frame == null)
{
return;
}
// Checks to make sure that frame parsed correctly.
if (frame.Size < 0)
{
return;
}
frameDataPosition += (int)(frame.Size + Id3v2FrameHeader.Size(header.MajorVersion));
// Only add frames with content so we don'type send out just we got in.
if (frame.Size > 0)
{
AddFrame(frame);
}
}
}
catch (Exception ex)
{
throw new ApplicationException("There was an error parsing this ID3 tag", ex);
}
}
else
{
throw new ArgumentNullException("data");
}
}
private void Scan()
{
// Scan the metadata pages
if (scanned || !IsValid)
{
return;
}
uint ipacket = 0;
long overhead = 0;
ByteVector metadata_header = GetPacket(ipacket++);
if (metadata_header == null)
{
return;
}
ByteVector header;
if (!metadata_header.StartsWith("fLaC"))
{
// FLAC 1.1.2+
if (metadata_header.Mid(1, 4) != "FLAC")
{
return;
}
if (metadata_header[5] != 1)
{
return; // not version 1
}
metadata_header = metadata_header.Mid(13);
}
else
{
// FLAC 1.1.0 & 1.1.1
metadata_header = GetPacket(ipacket++);
if (metadata_header == null)
{
return;
}
}
header = metadata_header.Mid(0, 4);
// Header format (from spec):
// <1> Last-metadata-block flag
// <7> BLOCK_TYPE
// 0 : STREAMINFO
// 1 : PADDING
// ..
// 4 : VORBIS_COMMENT
// ..
// <24> Length of metadata to follow
byte block_type = (byte)(header[0] & 0x7f);
bool last_block = (header[0] & 0x80) != 0;
uint length = header.Mid(1, 3).ToUInt();
overhead += length;
// Sanity: First block should be the stream_info metadata
if (block_type != 0)
{
TagLibDebugger.Debug("Ogg.Flac.File.Scan() -- Invalid Ogg/FLAC stream");
return;
}
stream_info_data = metadata_header.Mid(4, (int)length);
// Search through the remaining metadata
while (!last_block)
{
metadata_header = GetPacket(ipacket++);
if (metadata_header == null)
{
return;
}
header = metadata_header.Mid(0, 4);
block_type = (byte)(header[0] & 0x7f);
last_block = (header[0] & 0x80) != 0;
length = header.Mid(1, 3).ToUInt();
overhead += length;
if (block_type == 4)
{
xiph_comment_data = metadata_header.Mid(4, (int)length);
has_xiph_comment = true;
comment_packet = ipacket;
}
else if (block_type > 5)
{
TagLibDebugger.Debug("Ogg.Flac.File.Scan() -- Unknown metadata block");
}
}
// End of metadata, now comes the datastream
stream_start = overhead;
stream_length = Length - stream_start;
scanned = true;
}
public bool Strip(TagTypes types, bool freeMemory)
{
FileAccessMode original_mode = Mode;
if (IsReadOnly)
{
TagLibDebugger.Debug("Mpeg.File.Strip() - Cannot strip tags from a read only file.");
return(false);
}
try
{
Mode = FileAccessMode.Write;
}
catch (TagLibException)
{
TagLibDebugger.Debug("Mpeg.File.Strip() - Cannot strip tags from a read only file.");
return(false);
}
if ((types & TagTypes.Id3v2) != 0)
{
long id3v2_location = FindId3v2();
if (id3v2_location >= 0)
{
Seek(id3v2_location);
Id3v2Header header = new Id3v2Header(ReadBlock((int)Id3v2Header.Size));
if (header.TagSize == 0)
{
TagLibDebugger.Debug("Mpc.File.Save() -- Id3v2 header is broken. Ignoring.");
}
else
{
RemoveBlock(id3v2_location, (int)header.CompleteTagSize);
}
}
if (freeMemory)
{
id3v2_tag = null;
}
}
long id3v1_location = FindId3v1();
if ((types & TagTypes.Id3v1) != 0)
{
if (id3v1_location >= 0)
{
Truncate(id3v1_location);
id3v1_location = -1;
}
if (freeMemory)
{
id3v1_tag = null;
}
}
if ((types & TagTypes.Ape) != 0)
{
long ape_location = FindApe(id3v1_location >= 0);
if (ape_location != -1)
{
Seek(ape_location);
int ape_size = (int)(new ApeFooter(ReadBlock((int)ApeFooter.Size))).CompleteTagSize;
ape_location = ape_location + ApeFooter.Size - ape_size;
RemoveBlock(ape_location, ape_size);
}
if (freeMemory)
{
ape_tag = null;
}
}
tag.SetTags(id3v2_tag, ape_tag, id3v1_tag);
Mode = original_mode;
return(true);
}
public Mpeg4AppleElementaryStreamDescriptor(Mpeg4BoxHeader header, Mpeg4Box parent) : base(header, parent)
{
//WARNING: this was changed from accessing the Data property directy to instead
// use LoadBoxData which returns a reference to the underlying data. This change
// was required to avoid accessing the virtual methods that the Data property uses
// Everything should still work but if it doesn't then this change is the culprit...
decoderConfiguration = new ByteVector();
uint length;
// This box contains a ton of information.
int offset = 0;
// This is a safe alternative to the Data property
// it will be a reference to the same underlying structure and so should work identically to Data
ByteVector boxData = LoadBoxData();
// Elementary Stream Descriptor Tag
if (boxData[offset++] == 3)
{
// We have a descriptor tag. Check that it'field at least 20 long.
if ((length = ReadLength(boxData, offset)) < 20)
{
TagLibDebugger.Debug("TagLib.Mpeg4.AppleElementaryStreamDescriptor () - Could not read data. Too small.");
return;
}
offset += 4;
streamId = boxData.Mid(offset, 2).ToShort();
offset += 2;
streamPriority = boxData[offset++];
}
else
{
// The tag wasn'type found, so the next two byte are the ID, and
// after that, business as usual.
streamId = boxData.Mid(offset, 2).ToShort();
offset += 2;
}
// Verify that the next data is the Decoder Configuration Descriptor
// Tag and escape if it won'type work out.
if (boxData[offset++] != 4)
{
TagLibDebugger.Debug("TagLib.Mpeg4.AppleElementaryStreamDescriptor () - Could not identify decoder configuration descriptor.");
return;
}
// Check that it'field at least 15 long.
if ((length = ReadLength(boxData, offset)) < 15)
{
TagLibDebugger.Debug("TagLib.Mpeg4.AppleElementaryStreamDescriptor () - Could not read data. Too small.");
return;
}
offset += 4;
// Read a lot of good info.
objectTypeId = boxData[offset++];
streamType = boxData[offset++];
bufferSize = boxData.Mid(offset, 3).ToUInt();
offset += 3;
maximumBitrate = boxData.Mid(offset, 4).ToUInt();
offset += 4;
averageBitrate = boxData.Mid(offset, 4).ToUInt();
offset += 4;
// Verify that the next data is the Decoder Specific Descriptor
// Tag and escape if it won'type work out.
if (boxData[offset++] != 5)
{
TagLibDebugger.Debug("TagLib.Mpeg4.AppleElementaryStreamDescriptor () - Could not identify decoder specific descriptor.");
return;
}
// The rest of the info is decoder specific.
length = ReadLength(boxData, offset);
offset += 4;
decoderConfiguration = boxData.Mid(offset, (int)length);
}
public static Id3v2Frame CreateFrame(ByteVector data, uint version)
{
Id3v2FrameHeader header = new Id3v2FrameHeader(data, version);
ByteVector frameId = header.FrameId;
// A quick sanity check -- make sure that the frameId is 4 uppercase
// Latin1 characters. Also make sure that there is data in the frame.
if (frameId == null || frameId.Count != (version < 3 ? 3 : 4) || header.FrameSize < 0)
{
return(null);
}
foreach (byte b in frameId)
{
char c = (char)b;
if ((c < 'A' || c > 'Z') && (c < '1' || c > '9'))
{
return(null);
}
}
// Windows Media Player may create zero byte frames. Just send them
// off as unknown.
if (header.FrameSize == 0)
{
return(new Id3v2UnknownFrame(data, header));
}
// TagLib doesn'type mess with encrypted frames, so just treat them
// as unknown frames.
if (header.Compression)
{
TagLibDebugger.Debug("Compressed frames are currently not supported.");
return(new Id3v2UnknownFrame(data, header));
}
if (header.Encryption)
{
TagLibDebugger.Debug("Encrypted frames are currently not supported.");
return(new Id3v2UnknownFrame(data, header));
}
if (!UpdateFrame(header))
{
header.TagAlterPreservation = true;
return(new Id3v2UnknownFrame(data, header));
}
foreach (FrameCreator creator in frameCreators)
{
Id3v2Frame frame = creator(data, header);
if (frame != null)
{
return(frame);
}
}
// UpdateFrame() might have updated the frame ID.
frameId = header.FrameId;
// This is where things get necissarily nasty. Here we determine which
// Frame subclass (or if none is found simply an Frame) based
// on the frame ID. Since there are a lot of possibilities, that means
// a lot of if blocks.
// Text Identification (frames 4.2)
if (frameId.StartsWith("T"))
{
Id3v2TextIdentificationFrame frame = frameId != "TXXX"
? new Id3v2TextIdentificationFrame(data, header)
: new Id3v2UserTextIdentificationFrame(data, header);
if (useDefaultEncoding)
{
frame.TextEncoding = defaultEncoding;
}
return(frame);
}
// Comments (frames 4.10)
if (frameId == "COMM")
{
Id3v2CommentsFrame frame = new Id3v2CommentsFrame(data, header);
if (useDefaultEncoding)
{
frame.TextEncoding = defaultEncoding;
}
return(frame);
}
// Attached Picture (frames 4.14)
if (frameId == "APIC")
{
Id3v2AttachedPictureFrame f = new Id3v2AttachedPictureFrame(data, header);
if (useDefaultEncoding)
{
f.TextEncoding = defaultEncoding;
}
return(f);
}
// Relative Volume Adjustment (frames 4.11)
if (frameId == "RVA2")
{
return(new Id3v2RelativeVolumeFrame(data, header));
}
// Unique File Identifier (frames 4.1)
if (frameId == "UFID")
{
return(new Id3v2UniqueFileIdentifierFrame(data, header));
}
// Private (frames 4.27)
if (frameId == "PRIV")
{
return(new Id3v2PrivateFrame(data, header));
}
return(new Id3v2UnknownFrame(data, header));
}