////------------------------------------------------------------------------------------------------------------------------------
private static FlacMetadataBlock ReadBlock(StreamBuffer stream)
{
int flags = stream.ReadByte();
// Length
int length = stream.ReadBigEndianInt(3);
if (length >= stream.Length)
return null;
byte[] data = new byte[length];
stream.Read(data, length);
FlacMetadataBlock metadataBlock;
FlacMetadataBlockType blockType = (FlacMetadataBlockType)(flags & HeaderFlags.BlockType);
switch (blockType)
{
case FlacMetadataBlockType.Padding:
metadataBlock = new FlacPaddingMetadataBlock();
break;
case FlacMetadataBlockType.Application:
metadataBlock = new FlacApplicationMetadataBlock();
break;
case FlacMetadataBlockType.StreamInfo:
metadataBlock = new FlacStreamInfoMetadataBlock();
break;
case FlacMetadataBlockType.SeekTable:
metadataBlock = new FlacSeekTableMetadataBlock();
break;
case FlacMetadataBlockType.VorbisComment:
metadataBlock = new FlacVorbisCommentsMetadataBlock();
break;
case FlacMetadataBlockType.CueSheet:
metadataBlock = new FlacCueSheetMetadataBlock();
break;
case FlacMetadataBlockType.Picture:
metadataBlock = new FlacPictureMetadataBlock();
break;
default:
metadataBlock = new FlacMetadataBlock();
break;
}
metadataBlock.Flags = flags;
metadataBlock.Data = data;
return metadataBlock;
}
/// <summary>
/// Initializes a new instance of the <see cref="VbriHeader"/> class.
/// </summary>
/// <param name="firstFrame">The first frame.</param>
/// <param name="firstFrameBuffer">The first frame buffer.</param>
/// <param name="offset">The offset.</param>
public VbriHeader(MpaFrame firstFrame, StreamBuffer firstFrameBuffer, long offset)
: base(firstFrame, firstFrameBuffer, offset, VbrHeaderType.Vbri)
{
/*
FhG VBRI Header
size description
4 'VBRI' (ID)
2 version
2 delay
2 quality
4 # bytes
4 # frames
2 table size (for TOC)
2 table scale (for TOC)
2 size of a table entry (max. size = 4 byte (must be stored in an integer))
2 frames per table entry
?? dynamic table consisting out of frames with size 1-4 whole length in table size! (for TOC)
*/
// name
Name = firstFrameBuffer.ReadString(4);
// version
Version = (short)firstFrameBuffer.ReadBigEndianInt16();
// delay
_delay = firstFrameBuffer.ReadBigEndianInt16();
// quality
Quality = firstFrameBuffer.ReadBigEndianInt16();
// size of the file, in bytes, of all the data
FileSize = firstFrameBuffer.ReadBigEndianInt32();
// amount of frames
FrameCount = firstFrameBuffer.ReadBigEndianInt32();
// number of entries in the table (for TOC)
TableEntries = (short)firstFrameBuffer.ReadBigEndianInt16();
// table scale (for TOC)
TableScale = (short)firstFrameBuffer.ReadBigEndianInt16();
// size of a table entry (in bytes)
TableEntrySize = (short)firstFrameBuffer.ReadBigEndianInt16();
// frames per table entry
FramesPerTableEntry = (short)firstFrameBuffer.ReadBigEndianInt16();
// dynamic table consisting out of frames
TableLength = TableEntries * TableEntrySize;
Toc = new int[TableEntries + 1];
for (int i = 0; i <= TableEntries; i++)
{
int value = firstFrameBuffer.ReadBigEndianInt(TableEntrySize);
Toc[i] = value * TableScale;
}
_totalLengthMilliseconds = firstFrame.AudioLength * FrameCount;
}
public void ReadBigEndianIntTest3Bytes()
{
const int Value = 0x123456;
const int Expected = 0x563412;
StreamBuffer target = new StreamBuffer(BitConverter.GetBytes(Value)) { Position = 0 };
long actual = target.ReadBigEndianInt(3);
Assert.AreEqual(Expected, actual);
}
