/// <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>
/// <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;
LittleBinaryValue[] sampleBlock;
int bytesRead = source.Read(buffer, 0, blockSize);
while (bytesRead == blockSize)
{
// Create a new sample block, one binary sample value for each channel
sampleBlock = new LittleBinaryValue[channels];
for (int x = 0; x < channels; x++)
{
sampleBlock[x] = new LittleBinaryValue(buffer.CopyBuffer(x * sampleSize, sampleSize));
}
m_sampleBlocks.Add(sampleBlock);
bytesRead = source.Read(buffer, 0, blockSize);
}
}
/// <summary>
/// Creates a copy of the <see cref="WaveFormatChunk"/>.
/// </summary>
/// <returns>A new copy of the <see cref="WaveFormatChunk"/>.</returns>
public new WaveFormatChunk Clone()
{
WaveFormatChunk waveFormatChunk = new WaveFormatChunk(m_sampleRate, m_bitsPerSample, m_channels, m_audioFormat);
if ((object)m_extraParameters != null)
{
byte[] extraParameters = new byte[m_extraParameters.Length];
Buffer.BlockCopy(m_extraParameters, 0, extraParameters, 0, m_extraParameters.Length);
waveFormatChunk.ExtraParameters = extraParameters;
}
return waveFormatChunk;
}
public WaveDataChunk(WaveFormatChunk waveFormat)
: base(RiffTypeID)
{
m_waveFormat = waveFormat;
m_sampleBlocks = new List<LittleBinaryValue[]>();
}
/// <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[]>();
m_chunkSize = -1;
int blockSize = waveFormat.BlockAlignment;
int sampleSize = waveFormat.BitsPerSample / 8;
int channels = waveFormat.Channels;
TypeCode sampleTypeCode = m_waveFormat.GetSampleTypeCode();
LittleBinaryValue[] sampleBlock;
byte[] buffer = BufferPool.TakeBuffer(blockSize);
try
{
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);
}
}
finally
{
if (buffer != null)
BufferPool.ReturnBuffer(buffer);
}
}
/// <summary>
/// Creates a new <see cref="WaveFormatExtensible"/> object based on the <see cref="WaveFormatChunk"/> settings.
/// </summary>
/// <param name="waveFormat">A <see cref="WaveFormatChunk"/> format.</param>
public WaveFormatExtensible(WaveFormatChunk waveFormat)
{
m_sampleValue = (ushort)waveFormat.BitsPerSample;
m_channelMask = Speakers.All;
m_subFormat = DataFormatSubType.PCM;
}
/// <summary>
/// Creates a <see cref="WaveDataReader"/> instance created from a WAV stream.
/// </summary>
/// <param name="waveStream">The WAV stream. The data in the stream must include all headers that would be present in a WAV file.</param>
/// <returns>The WaveData instance created from a WAV stream.</returns>
/// <remarks>
/// This method is similar to the <see cref="WaveDataReader.WaveDataReader(Stream)"/> constructor,
/// however this method will first search the stream for a format chunk in order to set
/// up the WaveData object with proper format info.
/// </remarks>
public static WaveDataReader FromStream(Stream waveStream)
{
RiffChunk riffChunk;
WaveFormatChunk waveFormat = null;
WaveDataReader waveData = null;
while ((object)waveData == null)
{
riffChunk = RiffChunk.ReadNext(waveStream);
switch (riffChunk.TypeID)
{
case RiffHeaderChunk.RiffTypeID:
new RiffHeaderChunk(riffChunk, waveStream, "WAVE");
break;
case WaveFormatChunk.RiffTypeID:
waveFormat = new WaveFormatChunk(riffChunk, waveStream);
break;
case WaveDataChunk.RiffTypeID:
waveData = new WaveDataReader(waveFormat, waveStream);
break;
default:
// Skip unnecessary sections
waveStream.Seek(riffChunk.ChunkSize, SeekOrigin.Current);
break;
}
}
return waveData;
}
/// <summary>
/// Creates a new instance of the <see cref="WaveDataReader"/> class.
/// </summary>
/// <param name="waveFormat">The format of the wave stream.</param>
/// <param name="waveStream">The stream containing wave data.</param>
public WaveDataReader(WaveFormatChunk waveFormat, Stream waveStream)
{
m_format = waveFormat ?? DEFAULT_WAVE_FORMAT_CHUNK;
m_waveStream = waveStream;
m_blockSize = m_format.BlockAlignment;
m_sampleSize = m_format.BitsPerSample / 8;
m_channels = m_format.Channels;
m_sampleType = m_format.GetSampleTypeCode();
}
