private FlacFrame(Stream stream, FlacMetadataStreamInfo streamInfo)
{
if (stream == null) throw new ArgumentNullException("stream");
if (stream.CanRead == false) throw new ArgumentException("Stream is not readable");
_stream = stream;
_streamInfo = streamInfo;
}
internal unsafe FlacFrameHeader(ref byte* buffer, FlacMetadataStreamInfo streamInfo, bool doCrc, bool logError)
{
PrintErrors = logError; //optimized for prescan
DoCRC = doCrc;
StreamPosition = -1;
HasError = !ParseHeader(ref buffer, streamInfo);
}
//streamInfo can be null
public FlacFrameHeader(Stream stream, FlacMetadataStreamInfo streamInfo, bool doCrc)
{
if (stream == null) throw new ArgumentNullException("stream");
if (stream.CanRead == false) throw new ArgumentException("stream is not readable");
//streamInfo can be null
DoCRC = doCrc;
StreamPosition = stream.Position;
HasError = !ParseHeader(stream, streamInfo);
}
private void Decode(Stream stream, FlacMetadataStreamInfo streamInfo)
{
Header = new FlacFrameHeader(stream, streamInfo);
_stream = stream;
_streamInfo = streamInfo;
HasError = Header.HasError;
if (!HasError)
{
ReadSubFrames();
FreeBuffers();
}
}
public void ScanStream(FlacMetadataStreamInfo streamInfo, FlacPreScanMethodMode mode)
{
long saveOffset = _stream.Position;
StartScan(streamInfo, mode);
_stream.Position = saveOffset;
long totalLength = 0, totalsamples = 0;
foreach (var frame in Frames)
{
totalLength += frame.Header.BlockSize * frame.Header.BitsPerSample * frame.Header.Channels;
totalsamples += frame.Header.BlockSize;
}
TotalLength = totalLength;
TotalSamples = totalsamples;
}
public unsafe static FlacMetadata FromStream(Stream stream)
{
bool lastBlock = false;
FlacMetaDataType type = FlacMetaDataType.Undef;
int length = 0;
byte[] b = new byte[4];
if (stream.Read(b, 0, 4) <= 0)
throw new FlacException(new EndOfStreamException("Could not read metadata"), FlacLayer.Metadata);
fixed (byte* headerBytes = b)
{
FlacBitReader bitReader = new FlacBitReader(headerBytes, 0);
lastBlock = bitReader.ReadBits(1) == 1;
type = (FlacMetaDataType)bitReader.ReadBits(7);
length = (int)bitReader.ReadBits(24);
////1000 0000
//if (((b[0] & 0x80) >> 7) == 1)
// lastBlock = true;
//type = (FlacMetaDataType)(b[0] & 0x7F);
//int length = (b[1] + (b[2] << 8) + (b[3] << 16));
}
FlacMetadata data;
long streamStartPosition = stream.Position;
if ((int)type < 0 || (int)type > 6)
return null;
switch (type)
{
case FlacMetaDataType.StreamInfo:
data = new FlacMetadataStreamInfo(stream, length, lastBlock);
break;
case FlacMetaDataType.Seektable:
data = new FlacMetadataSeekTable(stream, length, lastBlock);
break;
default:
data = new FlacMetadata(type, lastBlock, length);
break;
}
stream.Seek(length - (stream.Position - streamStartPosition), SeekOrigin.Current);
return data;
}
private void StartScan(FlacMetadataStreamInfo streamInfo, FlacPreScanMethodMode method)
{
if (_isRunning)
throw new Exception("Scan is already running.");
_isRunning = true;
if (method == FlacPreScanMethodMode.Async)
{
ThreadPool.QueueUserWorkItem(o =>
{
Frames = RunScan(streamInfo);
_isRunning = false;
});
}
else
{
Frames = RunScan(streamInfo);
_isRunning = false;
}
}
private unsafe bool ParseHeader(Stream stream, FlacMetadataStreamInfo streamInfo)
{
const string loggerLocation = "FlacFrameHeader.ParseHeader(Stream, FlacMetadataStreamInfo)";
byte[] headerBuffer = new byte[FlacConstant.FrameHeaderSize];
if (stream.Read(headerBuffer, 0, headerBuffer.Length) == headerBuffer.Length)
{
fixed (byte* ptrBuffer = headerBuffer)
{
byte* ptrSave = ptrBuffer;
byte* __ptrBuffer = ptrBuffer;
bool result = ParseHeader(ref __ptrBuffer, streamInfo);
stream.Position -= (headerBuffer.Length - (__ptrBuffer - ptrSave)); //todo
return result;
}
}
else
{
Error("Not able to read Flac header - EOF?", loggerLocation);
return false;
}
}
private unsafe bool ParseHeader(ref byte* headerBuffer, FlacMetadataStreamInfo streamInfo)
{
const string loggerLocation = "FlacFrameHeader.ParseHeader(byte*, FlacMetadataStreamInfo)";
int x = -1; //tmp value to store in
if (headerBuffer[0] == 0xFF && headerBuffer[1] >> 1 == 0x7C) //sync bits
{
if ((headerBuffer[1] & 0x02) != 0) // ...10 2. letzes bits muss 0 sein
{
Error("Invalid FlacFrame. Reservedbit_0 is 1", loggerLocation);
return false;
}
byte* __headerbufferPtr = headerBuffer;
FlacBitReader reader = new FlacBitReader(__headerbufferPtr, 0);
#region blocksize
//blocksize
x = headerBuffer[2] >> 4;
int blocksize = -1;
if (x == 0)
{
Error("Invalid Blocksize value: 0", loggerLocation);
return false;
}
else if (x == 1)
blocksize = 192;
else if (x >= 2 && x <= 5)
blocksize = 576 << (x - 2);
else if (x == 6 || x == 7)
_blocksizeHint = x;
else if (x >= 8 && x <= 15)
blocksize = 256 << (x - 8);
else
{
Error("Invalid Blocksize value: " + x, loggerLocation);
return false;
}
BlockSize = blocksize;
#endregion blocksize
#region samplerate
//samplerate
x = headerBuffer[2] & 0x0F;
int sampleRate = -1;
if (x == 0)
{
if (streamInfo != null)
sampleRate = streamInfo.SampleRate;
else
{
Error("Missing Samplerate. Samplerate Index = 0 && streamInfoMetaData == null.", loggerLocation);
return false;
}
}
else if (x >= 1 && x <= 11)
sampleRate = FlacConstant.SampleRateTable[x];
else if (x >= 12 && x <= 14)
_sampleRateHint = x;
else
{
Error("Invalid SampleRate value: " + x, loggerLocation);
return false;
}
SampleRate = sampleRate;
#endregion samplerate
#region channels
x = headerBuffer[3] >> 4; //cc: unsigned
int channels = -1;
if ((x & 8) != 0)
{
channels = 2;
if ((x & 7) > 2 || (x & 7) < 0)
{
Error("Invalid ChannelAssignment", loggerLocation);
return false;
}
else
ChannelAssignment = (ChannelAssignment)((x & 7) + 1);
}
else
{
channels = x + 1;
ChannelAssignment = ChannelAssignment.Independent;
}
Channels = channels;
#endregion channels
#region bitspersample
x = (headerBuffer[3] & 0x0E) >> 1;
int bitsPerSample = -1;
if (x == 0)
{
if (streamInfo != null)
bitsPerSample = streamInfo.BitsPerSample;
else
{
Error("Missing BitsPerSample. Index = 0 && streamInfoMetaData == null.", loggerLocation);
return false;
}
}
else if (x == 3 || x >= 7 || x < 0)
{
Error("Invalid BitsPerSampleIndex", loggerLocation);
return false;
}
else
bitsPerSample = FlacConstant.BitPerSampleTable[x];
BitsPerSample = bitsPerSample;
#endregion bitspersample
if ((headerBuffer[3] & 0x01) != 0) // reserved bit -> 0
{
Error("Invalid FlacFrame. Reservedbit_1 is 1", loggerLocation);
return false;
}
//reader.SkipBits(4 * 8); //erste 3 bytes headerbytes überspringen, da diese schon ohne reader verarbeitet
reader.ReadBits(32);
//BYTE 4
#region utf8
//variable blocksize
if ((headerBuffer[1] & 0x01) != 0 ||
(streamInfo != null && streamInfo.MinBlockSize != streamInfo.MaxBlockSize))
{
ulong samplenumber;
if (reader.ReadUTF8_64(out samplenumber) && samplenumber != ulong.MaxValue)
{
NumberType = FlacNumberType.SampleNumber;
SampleNumber = samplenumber;
}
else
{
Error("Invalid UTF8 Samplenumber coding.", loggerLocation);
return false;
}
}
else //fixed blocksize
{
uint framenumber;// = reader.ReadUTF8();
if (reader.ReadUTF8_32(out framenumber) && framenumber != uint.MaxValue)
{
NumberType = FlacNumberType.FrameNumber;
FrameNumber = framenumber;
}
else
{
Error("Invalid UTF8 Framenumber coding.", loggerLocation);
return false;
}
}
#endregion utf8
#region read hints
//blocksize am ende des frameheaders
if (_blocksizeHint != 0)
{
x = (int)reader.ReadBits(8);
if (_blocksizeHint == 7)
{
x = (x << 8) | (int)reader.ReadBits(8);
}
BlockSize = x + 1;
}
//samplerate am ende des frameheaders
if (_sampleRateHint != 0)
{
x = (int)reader.ReadBits(8);
if (_sampleRateHint != 12)
{
x = (x << 8) | (int)reader.ReadBits(8);
}
if (_sampleRateHint == 12)
SampleRate = x * 1000;
else if (_sampleRateHint == 13)
SampleRate = x;
else
SampleRate = x * 10;
}
#endregion read hints
//if (Channels == 1 && BitsPerSample == 24 && SampleRate == 44100)
// System.Diagnostics.Debugger.Break();
if (DoCRC)
{
var crc8 = NAudio.Flac.CRC8.Instance.CalcCheckSum(reader.Buffer, 0, reader.Position);
CRC8 = (byte)reader.ReadBits(8);
if (CRC8 != crc8)
{
Error("CRC8 missmatch", loggerLocation);
return false;
}
}
headerBuffer += reader.Position;
return true;
}
Error("Invalid Syncbits", loggerLocation);
return false;
}
private unsafe bool IsFrame(ref byte* buffer, FlacMetadataStreamInfo streamInfo, FlacFrameHeader baseHeader, out FlacFrameHeader header)
{
header = new FlacFrameHeader(ref buffer, streamInfo, true, false);
return !header.HasError;
}
public unsafe FlacFrameHeader(ref byte *buffer, FlacMetadataStreamInfo streamInfo, bool doCrc)
: this(ref buffer, streamInfo, doCrc, true)
{
}
public unsafe FlacFrameHeader(ref byte* buffer, FlacMetadataStreamInfo streamInfo, bool doCrc)
: this(ref buffer, streamInfo, doCrc, true)
{
}
private unsafe List <FlacFrameInformation> ScanThisShit(FlacMetadataStreamInfo streamInfo)
{
Stream stream = _stream;
//if (!(stream is BufferedStream))
// stream = new BufferedStream(stream);
byte[] buffer = new byte[BufferSize];
int read = 0;
stream.Position = 4; //fLaC
FlacMetadata.ReadAllMetadataFromStream(stream);
List <FlacFrameInformation> frames = new List <FlacFrameInformation>();
FlacFrameInformation frameInfo = new FlacFrameInformation();
frameInfo.IsFirstFrame = true;
FlacFrameHeader baseHeader = null;
while (true)
{
read = stream.Read(buffer, 0, buffer.Length);
if (read <= FlacConstant.FrameHeaderSize)
break;
fixed(byte *bufferPtr = buffer)
{
byte *ptr = bufferPtr;
//for (int i = 0; i < read - FlacConstant.FrameHeaderSize; i++)
while ((bufferPtr + read - FlacConstant.FrameHeaderSize) > ptr)
{
if ((*ptr++ & 0xFF) == 0xFF && (*ptr & 0xF8) == 0xF8) //check sync
{
byte *ptrSafe = ptr;
ptr--;
FlacFrameHeader tmp = null;
if (IsFrame(ref ptr, streamInfo, baseHeader, out tmp))
{
FlacFrameHeader header = tmp;
if (frameInfo.IsFirstFrame)
{
baseHeader = header;
frameInfo.IsFirstFrame = false;
}
if (baseHeader.CompareTo(header))
{
frameInfo.StreamOffset = stream.Position - read + ((ptrSafe - 1) - bufferPtr);
frameInfo.Header = header;
frames.Add(frameInfo);
frameInfo.SampleOffset += header.BlockSize;
}
else
{
ptr = ptrSafe;
}
//todo:
}
else
{
ptr = ptrSafe;
}
}
}
}
stream.Position -= FlacConstant.FrameHeaderSize;
}
return(frames);
}
public FlacFrameHeader(Stream stream, FlacMetadataStreamInfo streamInfo)
: this(stream, streamInfo, true)
{
}
public FlacFrameHeader(Stream stream, FlacMetadataStreamInfo streamInfo)
: this(stream, streamInfo, true)
{
}
private unsafe bool IsFrame(ref byte *buffer, FlacMetadataStreamInfo streamInfo, FlacFrameHeader baseHeader, out FlacFrameHeader header)
{
header = new FlacFrameHeader(ref buffer, streamInfo, true, false);
return(!header.HasError);
}
public static FlacFrame FromStream(Stream stream, FlacMetadataStreamInfo streamInfo)
{
FlacFrame frame = new FlacFrame(stream, streamInfo);
return frame;
//return frame.HasError ? null : frame;
}
/// <summary>
/// Initializes a new instance of the <see cref="FlacReader" /> class.
/// </summary>
/// <param name="stream">Stream which contains flac data which should be decoded.</param>
/// <param name="scanFlag">Scan mode which defines how to scan the flac data for frames.</param>
/// <param name="onscanFinished">
/// Callback which gets called when the pre scan processes finished. Should be used if the
/// <paramref name="scanFlag" /> argument is set the <see cref="FlacPreScanMethodMode.Async" />.
/// </param>
public FlacReader(Stream stream, FlacPreScanMethodMode scanFlag,
Action<FlacPreScanFinishedEventArgs> onscanFinished)
{
if (stream == null)
throw new ArgumentNullException();
if (!stream.CanRead)
throw new ArgumentException("Stream is not readable.", "stream");
_stream = stream;
//skip ID3v2
NAudio.Flac.ID3v2.SkipTag(stream);
//read fLaC sync
var beginSync = new byte[4];
int read = stream.Read(beginSync, 0, beginSync.Length);
if (read < beginSync.Length)
throw new EndOfStreamException("Can not read \"fLaC\" sync.");
if (beginSync[0] == 0x66 && beginSync[1] == 0x4C && //Check for 'fLaC' signature
beginSync[2] == 0x61 && beginSync[3] == 0x43)
{
//read metadata
List<FlacMetadata> metadata = FlacMetadata.ReadAllMetadataFromStream(stream);
Metadata = metadata;
if (metadata == null || metadata.Count <= 0)
throw new FlacException("No Metadata found.", FlacLayer.Metadata);
var streamInfo =
metadata.First(x => x.MetaDataType == FlacMetaDataType.StreamInfo) as FlacMetadataStreamInfo;
if (streamInfo == null)
throw new FlacException("No StreamInfo-Metadata found.", FlacLayer.Metadata);
_streamInfo = streamInfo;
_waveFormat = new WaveFormat(streamInfo.SampleRate, (short) streamInfo.BitsPerSample,
(short) streamInfo.Channels);
Debug.WriteLine("Flac StreamInfo found -> WaveFormat: " + _waveFormat);
Debug.WriteLine("Flac-File-Metadata read.");
}
else
throw new FlacException("Invalid Flac-File. \"fLaC\" Sync not found.", FlacLayer.Top);
//prescan stream
if (scanFlag != FlacPreScanMethodMode.None)
{
var scan = new FlacPreScan(stream);
scan.ScanFinished += (s, e) =>
{
if (onscanFinished != null)
onscanFinished(e);
};
scan.ScanStream(_streamInfo, scanFlag);
_scan = scan;
}
}
private unsafe List<FlacFrameInformation> ScanThisShit(FlacMetadataStreamInfo streamInfo)
{
Stream stream = _stream;
//if (!(stream is BufferedStream))
// stream = new BufferedStream(stream);
byte[] buffer = new byte[BufferSize];
int read = 0;
stream.Position = 4; //fLaC
FlacMetadata.ReadAllMetadataFromStream(stream);
List<FlacFrameInformation> frames = new List<FlacFrameInformation>();
FlacFrameInformation frameInfo = new FlacFrameInformation();
frameInfo.IsFirstFrame = true;
FlacFrameHeader baseHeader = null;
while (true)
{
read = stream.Read(buffer, 0, buffer.Length);
if (read <= FlacConstant.FrameHeaderSize)
break;
fixed (byte* bufferPtr = buffer)
{
byte* ptr = bufferPtr;
//for (int i = 0; i < read - FlacConstant.FrameHeaderSize; i++)
while ((bufferPtr + read - FlacConstant.FrameHeaderSize) > ptr)
{
if ((*ptr++ & 0xFF) == 0xFF && (*ptr & 0xF8) == 0xF8) //check sync
{
byte* ptrSafe = ptr;
ptr--;
FlacFrameHeader tmp = null;
if (IsFrame(ref ptr, streamInfo, baseHeader, out tmp))
{
FlacFrameHeader header = tmp;
if (frameInfo.IsFirstFrame)
{
baseHeader = header;
frameInfo.IsFirstFrame = false;
}
if (baseHeader.CompareTo(header))
{
frameInfo.StreamOffset = stream.Position - read + ((ptrSafe - 1) - bufferPtr);
frameInfo.Header = header;
frames.Add(frameInfo);
frameInfo.SampleOffset += header.BlockSize;
}
else
{
ptr = ptrSafe;
}
//todo:
}
else
{
ptr = ptrSafe;
}
}
}
}
stream.Position -= FlacConstant.FrameHeaderSize;
}
return frames;
}
private unsafe bool ParseHeader(ref byte *headerBuffer, FlacMetadataStreamInfo streamInfo)
{
const string loggerLocation = "FlacFrameHeader.ParseHeader(byte*, FlacMetadataStreamInfo)";
int x = -1; //tmp value to store in
if (headerBuffer[0] == 0xFF && headerBuffer[1] >> 1 == 0x7C) //sync bits
{
if ((headerBuffer[1] & 0x02) != 0) // ...10 2. letzes bits muss 0 sein
{
Error("Invalid FlacFrame. Reservedbit_0 is 1", loggerLocation);
return(false);
}
byte * __headerbufferPtr = headerBuffer;
FlacBitReader reader = new FlacBitReader(__headerbufferPtr, 0);
#region blocksize
//blocksize
x = headerBuffer[2] >> 4;
int blocksize = -1;
if (x == 0)
{
Error("Invalid Blocksize value: 0", loggerLocation);
return(false);
}
else if (x == 1)
{
blocksize = 192;
}
else if (x >= 2 && x <= 5)
{
blocksize = 576 << (x - 2);
}
else if (x == 6 || x == 7)
{
_blocksizeHint = x;
}
else if (x >= 8 && x <= 15)
{
blocksize = 256 << (x - 8);
}
else
{
Error("Invalid Blocksize value: " + x, loggerLocation);
return(false);
}
BlockSize = blocksize;
#endregion blocksize
#region samplerate
//samplerate
x = headerBuffer[2] & 0x0F;
int sampleRate = -1;
if (x == 0)
{
if (streamInfo != null)
{
sampleRate = streamInfo.SampleRate;
}
else
{
Error("Missing Samplerate. Samplerate Index = 0 && streamInfoMetaData == null.", loggerLocation);
return(false);
}
}
else if (x >= 1 && x <= 11)
{
sampleRate = FlacConstant.SampleRateTable[x];
}
else if (x >= 12 && x <= 14)
{
_sampleRateHint = x;
}
else
{
Error("Invalid SampleRate value: " + x, loggerLocation);
return(false);
}
SampleRate = sampleRate;
#endregion samplerate
#region channels
x = headerBuffer[3] >> 4; //cc: unsigned
int channels = -1;
if ((x & 8) != 0)
{
channels = 2;
if ((x & 7) > 2 || (x & 7) < 0)
{
Error("Invalid ChannelAssignment", loggerLocation);
return(false);
}
else
{
ChannelAssignment = (ChannelAssignment)((x & 7) + 1);
}
}
else
{
channels = x + 1;
ChannelAssignment = ChannelAssignment.Independent;
}
Channels = channels;
#endregion channels
#region bitspersample
x = (headerBuffer[3] & 0x0E) >> 1;
int bitsPerSample = -1;
if (x == 0)
{
if (streamInfo != null)
{
bitsPerSample = streamInfo.BitsPerSample;
}
else
{
Error("Missing BitsPerSample. Index = 0 && streamInfoMetaData == null.", loggerLocation);
return(false);
}
}
else if (x == 3 || x >= 7 || x < 0)
{
Error("Invalid BitsPerSampleIndex", loggerLocation);
return(false);
}
else
{
bitsPerSample = FlacConstant.BitPerSampleTable[x];
}
BitsPerSample = bitsPerSample;
#endregion bitspersample
if ((headerBuffer[3] & 0x01) != 0) // reserved bit -> 0
{
Error("Invalid FlacFrame. Reservedbit_1 is 1", loggerLocation);
return(false);
}
//reader.SkipBits(4 * 8); //erste 3 bytes headerbytes überspringen, da diese schon ohne reader verarbeitet
reader.ReadBits(32);
//BYTE 4
#region utf8
//variable blocksize
if ((headerBuffer[1] & 0x01) != 0 ||
(streamInfo != null && streamInfo.MinBlockSize != streamInfo.MaxBlockSize))
{
ulong samplenumber;
if (reader.ReadUTF8_64(out samplenumber) && samplenumber != ulong.MaxValue)
{
NumberType = FlacNumberType.SampleNumber;
SampleNumber = samplenumber;
}
else
{
Error("Invalid UTF8 Samplenumber coding.", loggerLocation);
return(false);
}
}
else //fixed blocksize
{
uint framenumber;// = reader.ReadUTF8();
if (reader.ReadUTF8_32(out framenumber) && framenumber != uint.MaxValue)
{
NumberType = FlacNumberType.FrameNumber;
FrameNumber = framenumber;
}
else
{
Error("Invalid UTF8 Framenumber coding.", loggerLocation);
return(false);
}
}
#endregion utf8
#region read hints
//blocksize am ende des frameheaders
if (_blocksizeHint != 0)
{
x = (int)reader.ReadBits(8);
if (_blocksizeHint == 7)
{
x = (x << 8) | (int)reader.ReadBits(8);
}
BlockSize = x + 1;
}
//samplerate am ende des frameheaders
if (_sampleRateHint != 0)
{
x = (int)reader.ReadBits(8);
if (_sampleRateHint != 12)
{
x = (x << 8) | (int)reader.ReadBits(8);
}
if (_sampleRateHint == 12)
{
SampleRate = x * 1000;
}
else if (_sampleRateHint == 13)
{
SampleRate = x;
}
else
{
SampleRate = x * 10;
}
}
#endregion read hints
//if (Channels == 1 && BitsPerSample == 24 && SampleRate == 44100)
// System.Diagnostics.Debugger.Break();
if (DoCRC)
{
var crc8 = NAudio.Flac.CRC8.Instance.CalcCheckSum(reader.Buffer, 0, reader.Position);
CRC8 = (byte)reader.ReadBits(8);
if (CRC8 != crc8)
{
Error("CRC8 missmatch", loggerLocation);
return(false);
}
}
headerBuffer += reader.Position;
return(true);
}
Error("Invalid Syncbits", loggerLocation);
return(false);
}
private List<FlacFrameInformation> RunScan(FlacMetadataStreamInfo streamInfo)
{
#if DEBUG
Stopwatch watch = new Stopwatch();
watch.Start();
#endif
var result = ScanThisShit(streamInfo);
#if DEBUG
watch.Stop();
Debug.WriteLine(String.Format("FlacPreScan finished: {0} Bytes processed in {1} ms.",
_stream.Length, watch.ElapsedMilliseconds));
#endif
RaiseScanFinished(result);
return result;
}
