public static void ReadAiffHeader(Stream stream, out WaveFormat format, out long dataChunkPosition, out int dataChunkLength, List<AiffFileReader.AiffChunk> chunks)
{
dataChunkPosition = -1L;
format = null;
BinaryReader binaryReader = new BinaryReader(stream);
if (AiffFileReader.ReadChunkName(binaryReader) != "FORM")
{
throw new FormatException("Not an AIFF file - no FORM header.");
}
AiffFileReader.ConvertInt(binaryReader.ReadBytes(4));
string a = AiffFileReader.ReadChunkName(binaryReader);
if (a != "AIFC" && a != "AIFF")
{
throw new FormatException("Not an AIFF file - no AIFF/AIFC header.");
}
dataChunkLength = 0;
while (binaryReader.BaseStream.Position < binaryReader.BaseStream.Length)
{
AiffFileReader.AiffChunk aiffChunk = AiffFileReader.ReadChunkHeader(binaryReader);
if (aiffChunk.ChunkName == "\0\0\0\0" || binaryReader.BaseStream.Position + (long)((ulong)aiffChunk.ChunkLength) > binaryReader.BaseStream.Length)
{
break;
}
if (aiffChunk.ChunkName == "COMM")
{
short channels = AiffFileReader.ConvertShort(binaryReader.ReadBytes(2));
AiffFileReader.ConvertInt(binaryReader.ReadBytes(4));
short bits = AiffFileReader.ConvertShort(binaryReader.ReadBytes(2));
double num = IEEE.ConvertFromIeeeExtended(binaryReader.ReadBytes(10));
format = new WaveFormat((int)num, (int)bits, (int)channels);
if (aiffChunk.ChunkLength > 18u && a == "AIFC")
{
if (new string(binaryReader.ReadChars(4)).ToLower() != "none")
{
throw new FormatException("Compressed AIFC is not supported.");
}
binaryReader.ReadBytes((int)(aiffChunk.ChunkLength - 22u));
}
else
{
binaryReader.ReadBytes((int)(aiffChunk.ChunkLength - 18u));
}
}
else if (aiffChunk.ChunkName == "SSND")
{
uint num2 = AiffFileReader.ConvertInt(binaryReader.ReadBytes(4));
AiffFileReader.ConvertInt(binaryReader.ReadBytes(4));
dataChunkPosition = (long)((ulong)(aiffChunk.ChunkStart + 16u + num2));
dataChunkLength = (int)(aiffChunk.ChunkLength - 8u);
binaryReader.BaseStream.Position += (long)((ulong)(aiffChunk.ChunkLength - 8u));
}
else
{
if (chunks != null)
{
chunks.Add(aiffChunk);
}
binaryReader.BaseStream.Position += (long)((ulong)aiffChunk.ChunkLength);
}
}
if (format == null)
{
throw new FormatException("Invalid AIFF file - No COMM chunk found.");
}
if (dataChunkPosition == -1L)
{
throw new FormatException("Invalid AIFF file - No SSND chunk found.");
}
}
/// <summary>
/// Ensures valid AIFF header and then finds data offset.
/// </summary>
/// <param name="stream">The stream, positioned at the start of audio data</param>
/// <param name="format">The format found</param>
/// <param name="dataChunkPosition">The position of the data chunk</param>
/// <param name="dataChunkLength">The length of the data chunk</param>
/// <param name="chunks">Additional chunks found</param>
public static void ReadAiffHeader(System.IO.Stream stream, out WaveFormatProvider format, out long dataChunkPosition, out int dataChunkLength, List <AiffChunk> chunks)
{
dataChunkPosition = -1;
format = null;
BinaryReader br = new BinaryReader(stream);
if (ReadChunkName(br) != "FORM")
{
throw new FormatException("Not an AIFF file - no FORM header.");
}
uint fileSize = ConvertInt(br.ReadBytes(4));
string formType = ReadChunkName(br);
if (formType != "AIFC" && formType != "AIFF")
{
throw new FormatException("Not an AIFF file - no AIFF/AIFC header.");
}
dataChunkLength = 0;
while (br.BaseStream.Position < br.BaseStream.Length)
{
AiffChunk nextChunk = ReadChunkHeader(br);
if (nextChunk.ChunkName == "COMM")
{
short numChannels = ConvertShort(br.ReadBytes(2));
uint numSampleFrames = ConvertInt(br.ReadBytes(4));
short sampleSize = ConvertShort(br.ReadBytes(2));
double sampleRate = IEEE.ConvertFromIeeeExtended(br.ReadBytes(10));
format = new WaveFormatProvider((int)sampleRate, (int)sampleSize, (int)numChannels);
if (nextChunk.ChunkLength > 18 && formType == "AIFC")
{
// In an AIFC file, the compression format is tacked on to the COMM chunk
string compress = new string(br.ReadChars(4)).ToLower();
if (compress != "none")
{
throw new FormatException("Compressed AIFC is not supported.");
}
br.ReadBytes((int)nextChunk.ChunkLength - 22);
}
else
{
br.ReadBytes((int)nextChunk.ChunkLength - 18);
}
}
else if (nextChunk.ChunkName == "SSND")
{
uint offset = ConvertInt(br.ReadBytes(4));
uint blockSize = ConvertInt(br.ReadBytes(4));
dataChunkPosition = nextChunk.ChunkStart + 16 + offset;
dataChunkLength = (int)nextChunk.ChunkLength - 8;
br.ReadBytes((int)nextChunk.ChunkLength - 8);
}
else
{
if (chunks != null)
{
chunks.Add(nextChunk);
}
br.ReadBytes((int)nextChunk.ChunkLength);
}
if (nextChunk.ChunkName == "\0\0\0\0")
{
break;
}
}
if (format == null)
{
throw new FormatException("Invalid AIFF file - No COMM chunk found.");
}
if (dataChunkPosition == -1)
{
throw new FormatException("Invalid AIFF file - No SSND chunk found.");
}
}
public bool Read(string filePath)
{
if (File.Exists(filePath))
{
string fileName = Path.GetFileNameWithoutExtension(filePath);
PresetName = fileName;
BinaryFile bFile = new BinaryFile(filePath, BinaryFile.ByteOrder.BigEndian);
string firstChunkID = bFile.ReadString(4); // chunk ID = "FORM"
int ckSize = bFile.ReadInt32();
string formType = bFile.ReadString(4);
// read first data chunk
string chunkID = bFile.ReadString(4);
// if chunkID == "COMT" then CommentsChunk
if (chunkID.Equals("COMT"))
{
long curposTmpComt = bFile.GetPosition();
bFile.Seek(curposTmpComt - 4);
// CommentsChunk
string chunkIDComt = bFile.ReadString(4); // chunk ID = "COMT"
int chunkSizeComt = bFile.ReadInt32();
int numComments = bFile.ReadUInt16();
long curposTmpComt2 = bFile.GetPosition();
for (int i = 0; i < numComments; i++)
{
int commentTimestamp = (int)bFile.ReadUInt32();
string marker = bFile.ReadString(4);
int count = (int)bFile.ReadByte();
comments.Add(bFile.ReadString(count));
}
bFile.Seek(curposTmpComt2 + chunkSizeComt - 2);
}
string chunkID2 = bFile.ReadString(4);
// if chunkID2 == "COMM" then CommonChunk
if (chunkID2.Equals("COMM"))
{
long curposTmpComm = bFile.GetPosition();
bFile.Seek(curposTmpComm - 4);
// CommonChunk
string chunkIDComm = bFile.ReadString(4); // chunk ID = "COMM"
int chunkSizeComm = bFile.ReadInt32();
channels = bFile.ReadInt16();
numSampleFrames = (int)bFile.ReadUInt32();
bitsPerSample = bFile.ReadInt16();
// read IEEE 80-bit extended double precision
byte[] sampleRateBytes = bFile.ReadBytes(0, 10, BinaryFile.ByteOrder.LittleEndian);
double sampleRateDouble = IEEE.ConvertFromIeeeExtended(sampleRateBytes);
sampleRate = (int)sampleRateDouble;
}
string chunkID3 = bFile.ReadString(4);
// if chunkID3 == "SSND" then SoundDataChunk
if (chunkID3.Equals("SSND"))
{
long curposTmpSsnd = bFile.GetPosition();
bFile.Seek(curposTmpSsnd - 4);
// SoundDataChunk
string chunkIDSsnd = bFile.ReadString(4); // chunk ID = "SSND"
int chunkSizeSsnd = bFile.ReadInt32();
int offset = (int)bFile.ReadUInt32();
int blocksize = (int)bFile.ReadUInt32();
byte[] data = bFile.ReadBytes(offset, chunkSizeSsnd - 8, BinaryFile.ByteOrder.LittleEndian);
// swap waveform data
WaveformData = SwapAiffEndian(data);
}
bFile.Close();
return(true);
}
else
{
return(false);
}
}
