/// <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;
}
}
/// <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;
}
}
