protected WaveDataChunk(RiffParser parser, BinaryReader reader) : base(reader)
{
if (parser.ReadDataChunk)
{
Data = reader.ReadBytes(SubChunkSize);
}
}
public At9DataChunk(RiffParser parser, BinaryReader reader) : base(reader)
{
// Do not trust the BlockAlign field in the fmt chunk to equal the superframe size.
// Some AT9 files have an invalid number in there.
// Calculate the size using the ATRAC9 DataConfig instead.
At9WaveExtensible ext = parser.GetSubChunk <WaveFmtChunk>("fmt ")?.Ext as At9WaveExtensible;
if (ext == null)
{
throw new InvalidDataException("fmt chunk must come before data chunk");
}
At9FactChunk fact = parser.GetSubChunk <At9FactChunk>("fact");
if (fact == null)
{
throw new InvalidDataException("fact chunk must come before data chunk");
}
var config = new LibAtrac9.Atrac9Config(ext.ConfigData);
FrameCount = (fact.SampleCount + fact.EncoderDelaySamples).DivideByRoundUp(config.SuperframeSamples);
int dataSize = FrameCount * config.SuperframeBytes;
if (dataSize > reader.BaseStream.Length - reader.BaseStream.Position)
{
throw new InvalidDataException("Required AT9 length is greater than the number of bytes remaining in the file.");
}
AudioData = reader.BaseStream.DeInterleave(dataSize, config.SuperframeBytes, FrameCount);
}
protected WaveFmtChunk(RiffParser parser, BinaryReader reader) : base(reader)
{
FormatTag = reader.ReadUInt16();
ChannelCount = reader.ReadInt16();
SampleRate = reader.ReadInt32();
AvgBytesPerSec = reader.ReadInt32();
BlockAlign = reader.ReadInt16();
BitsPerSample = reader.ReadInt16();
if (FormatTag == WaveFormatTags.WaveFormatExtensible && parser.FormatExtensibleParser != null)
{
long startOffset = reader.BaseStream.Position + 2;
Ext = parser.FormatExtensibleParser(parser, reader);
long endOffset = startOffset + Ext.Size;
int remainingBytes = (int)Math.Max(endOffset - reader.BaseStream.Position, 0);
Ext.Extra = reader.ReadBytes(remainingBytes);
}
}
public static WaveFormatExtensible Parse(RiffParser parser, BinaryReader reader) => new WaveFormatExtensible(reader);
public static At9DataChunk ParseAt9(RiffParser parser, BinaryReader reader) => new At9DataChunk(parser, reader);
public static At9WaveExtensible ParseAt9(RiffParser parser, BinaryReader reader) => new At9WaveExtensible(reader);
public static At9FactChunk ParseAt9(RiffParser parser, BinaryReader reader) => new At9FactChunk(reader);
public static WaveDataChunk Parse(RiffParser parser, BinaryReader reader) => new WaveDataChunk(parser, reader);
public static WaveFactChunk Parse(RiffParser parser, BinaryReader reader) => new WaveFactChunk(reader);