private void Initialize(Stream stream)
{
RiffParser riffParser = new RiffParser(stream);
this.FileFormatName = "Unknown";
if (!riffParser.MoveNext() || riffParser.Current == null)
{
this.ThrowInvalidFileFormat((Exception)null);
}
else
{
this.FileFormatName = (string)riffParser.Current.Type;
if (this.FileFormatName != "WAVE" && this.FileFormatName != "XWMA")
{
throw new InvalidOperationException("Unsupported " + this.FileFormatName + " file format. Only WAVE or XWMA");
}
riffParser.Descend();
IList <RiffChunk> allChunks = riffParser.GetAllChunks();
RiffChunk riffChunk1 = this.Chunk((IEnumerable <RiffChunk>)allChunks, "fmt ");
if ((long)riffChunk1.Size < (long)sizeof(WaveFormat.__PcmNative))
{
this.ThrowInvalidFileFormat((Exception)null);
}
try
{
this.Format = WaveFormat.MarshalFrom(riffChunk1.GetData());
}
catch (InvalidOperationException ex)
{
this.ThrowInvalidFileFormat((Exception)ex);
}
if (this.FileFormatName == "XWMA")
{
if (this.Format.Encoding != WaveFormatEncoding.Wmaudio2 && this.Format.Encoding != WaveFormatEncoding.Wmaudio3)
{
this.ThrowInvalidFileFormat((Exception)null);
}
this.DecodedPacketsInfo = this.Chunk((IEnumerable <RiffChunk>)allChunks, "dpds").GetDataAsArray <uint>();
}
else
{
switch (this.Format.Encoding)
{
case WaveFormatEncoding.Extensible:
case WaveFormatEncoding.Pcm:
case WaveFormatEncoding.Adpcm:
case WaveFormatEncoding.IeeeFloat:
break;
default:
this.ThrowInvalidFileFormat((Exception)null);
break;
}
}
RiffChunk riffChunk2 = this.Chunk((IEnumerable <RiffChunk>)allChunks, "data");
this.startPositionOfData = (long)riffChunk2.DataPosition;
this.length = (long)riffChunk2.Size;
this.input.Position = this.startPositionOfData;
}
}
/// <summary>
/// Initializes the specified stream.
/// </summary>
/// <param name="stream">The stream.</param>
private unsafe void Initialize(Stream stream)
{
var parser = new RiffParser(stream);
FileFormatName = "Unknown";
// Parse Header
if (!parser.MoveNext() || parser.Current == null)
{
ThrowInvalidFileFormat();
return;
}
// Check that WAVE or XWMA header is present
FileFormatName = parser.Current.Type;
if (FileFormatName != "WAVE" && FileFormatName != "XWMA")
{
throw new InvalidOperationException("Unsupported " + FileFormatName + " file format. Only WAVE or XWMA");
}
// Parse inside the first chunk
parser.Descend();
// Get all the chunk
var chunks = parser.GetAllChunks();
// Get "fmt" chunk
var fmtChunk = Chunk(chunks, "fmt ");
if (fmtChunk.Size < sizeof(WaveFormat.__PcmNative))
{
ThrowInvalidFileFormat();
}
try
{
Format = WaveFormat.MarshalFrom(fmtChunk.GetData());
}
catch (InvalidOperationException ex)
{
ThrowInvalidFileFormat(ex);
}
// If XWMA
if (FileFormatName == "XWMA")
{
// Check that format is Wma
if (Format.Encoding != WaveFormatEncoding.Wmaudio2 && Format.Encoding != WaveFormatEncoding.Wmaudio3)
{
ThrowInvalidFileFormat();
}
// Check for "dpds" chunk
// Get the dpds decoded packed cumulative bytes
var dpdsChunk = Chunk(chunks, "dpds");
DecodedPacketsInfo = dpdsChunk.GetDataAsArray <uint>();
}
else
{
switch (Format.Encoding)
{
case WaveFormatEncoding.Pcm:
case WaveFormatEncoding.IeeeFloat:
case WaveFormatEncoding.Extensible:
case WaveFormatEncoding.Adpcm:
break;
default:
ThrowInvalidFileFormat();
break;
}
}
// Check for "data" chunk
var dataChunk = Chunk(chunks, "data");
startPositionOfData = dataChunk.DataPosition;
length = dataChunk.Size;
input.Position = startPositionOfData;
}