/// <summary>Reads a new WAVE format section from the specified stream.</summary>
/// <param name="preRead">Pre-parsed <see cref="RiffChunk"/> header.</param>
/// <param name="source">Source stream to read data from.</param>
/// <param name="waveFormat">Format of the data section to be parsed.</param>
/// <exception cref="InvalidOperationException">WAVE format or extra parameters section too small, wave file corrupted.</exception>
public WaveDataChunk(RiffChunk preRead, Stream source, WaveFormatChunk waveFormat)
: base(preRead, RiffTypeID)
{
m_waveFormat = waveFormat;
m_sampleBlocks = new List<LittleBinaryValue[]>();
int blockSize = waveFormat.BlockAlignment;
int sampleSize = waveFormat.BitsPerSample / 8;
byte[] buffer = new byte[blockSize];
int channels = waveFormat.Channels;
TypeCode sampleTypeCode = m_waveFormat.GetSampleTypeCode();
LittleBinaryValue[] sampleBlock;
int bytesRead = source.Read(buffer, 0, blockSize);
while (bytesRead == blockSize)
{
// Create a new sample block, one little-endian formatted binary sample value for each channel
sampleBlock = new LittleBinaryValue[channels];
for (int x = 0; x < channels; x++)
{
sampleBlock[x] = new LittleBinaryValue(sampleTypeCode, buffer, x * sampleSize, sampleSize);
}
m_sampleBlocks.Add(sampleBlock);
bytesRead = source.Read(buffer, 0, blockSize);
}
}
/// <summary>Reads a new RIFF header from the specified stream.</summary>
/// <param name="preRead">Pre-parsed <see cref="RiffChunk"/> header.</param>
/// <param name="source">Source stream to read data from.</param>
/// <param name="format">Expected RIFF media format (e.g., "WAVE").</param>
/// <exception cref="ArgumentNullException"><paramref name="format"/> cannot be null.</exception>
/// <exception cref="ArgumentOutOfRangeException"><paramref name="format"/> must be extactly 4 characters in length.</exception>
public RiffHeaderChunk(RiffChunk preRead, Stream source, string format)
: base(preRead, RiffTypeID)
{
Format = format;
int length = BinaryLength - preRead.BinaryLength;
byte[] buffer = new byte[length];
int bytesRead = source.Read(buffer, 0, length);
if (bytesRead < length)
throw new InvalidOperationException("RIFF format section too small, media file corrupted.");
// Read and validate format stored in RIFF section
format = Encoding.ASCII.GetString(buffer, 0, 4);
if (format != Format)
throw new InvalidDataException(string.Format("{0} format expected but got {1}, this does not appear to be a valid {0} file", Format, format));
m_format = format;
}
/// <summary>Reads a new WAVE format section from the specified stream.</summary>
/// <param name="preRead">Pre-parsed RIFF chunk header.</param>
/// <param name="source">Source stream to read data from.</param>
/// <exception cref="InvalidOperationException">WAVE format or extra parameters section too small, wave file corrupted.</exception>
public WaveFormatChunk(RiffChunk preRead, Stream source)
: base(preRead, RiffTypeID)
{
int length = ChunkSize;
byte[] buffer = new byte[length];
int bytesRead = source.Read(buffer, 0, length);
if (bytesRead < length)
throw new InvalidOperationException("WAVE format section too small, wave file corrupted.");
m_audioFormat = EndianOrder.LittleEndian.ToUInt16(buffer, 0);
m_channels = EndianOrder.LittleEndian.ToInt16(buffer, 2);
m_sampleRate = EndianOrder.LittleEndian.ToInt32(buffer, 4);
m_byteRate = EndianOrder.LittleEndian.ToInt32(buffer, 8);
m_blockAlignment = EndianOrder.LittleEndian.ToInt16(buffer, 12);
m_bitsPerSample = EndianOrder.LittleEndian.ToInt16(buffer, 14);
if (m_bitsPerSample % 8 != 0)
throw new InvalidDataException("Invalid bit rate encountered - wave file bit rates must be a multiple of 8");
if (length > 16)
{
m_extraParametersSize = EndianOrder.LittleEndian.ToInt16(buffer, 16);
// Read extra parameters, if any
if (m_extraParametersSize > 0)
{
m_extraParameters = new byte[m_extraParametersSize];
bytesRead = source.Read(m_extraParameters, 0, m_extraParametersSize);
if (bytesRead < m_extraParametersSize)
throw new InvalidOperationException("WAVE extra parameters section too small, wave file corrupted.");
}
}
}
protected RiffChunk(RiffChunk preRead, string typeID)
{
if (typeID != preRead.TypeID)
throw new InvalidDataException(string.Format("{0} chunk expected but got {1}, file does not appear to be valid.", typeID, preRead.TypeID));
m_typeID = preRead.TypeID;
m_chunkSize = preRead.ChunkSize;
}
// Static Methods
public static RiffChunk ReadNext(Stream source)
{
RiffChunk riffChunk = new RiffChunk();
int length = riffChunk.BinaryLength;
byte[] buffer = new byte[length];
int bytesRead = source.Read(buffer, 0, length);
if (bytesRead < length)
throw new InvalidOperationException("RIFF chunk too small, media file corrupted.");
riffChunk.TypeID = Encoding.ASCII.GetString(buffer, 0, 4);
riffChunk.ChunkSize = EndianOrder.LittleEndian.ToInt32(buffer, 4);
return riffChunk;
}
public RiffChunk Clone()
{
RiffChunk riffChunk = new RiffChunk(m_typeID);
riffChunk.ChunkSize = m_chunkSize;
return riffChunk;
}
