/// <summary>
/// Writes the prologue of the root chunk to the underlying stream, i.e. all
/// bytes up to the first nested chunk.
/// </summary>
/// <param name="payloadSize">
/// The payload size of the root chunk, i.e. including the gross sizes of the
/// nested chunks.
/// </param>
private void WriteRootChunkPrologue(int payloadSize)
{
var chunkHeader = new WaveformFileFormat.ChunkHeader(WaveformFileFormat.RootChunkId, payloadSize);
WriteChunkHeader(chunkHeader);
_stream.WriteString(WaveformFileFormat.RiffType);
}
/// <summary>
/// Writes the chunk containing the waveform data to the underlying stream.
/// </summary>
/// <param name="waveForm">The waveform.</param>
private void WriteDataChunk(IWaveform waveForm)
{
var chunkSize = GetDataChunkPayloadSize(waveForm);
var chunkHeader = new WaveformFileFormat.ChunkHeader(WaveformFileFormat.DataChunkId, chunkSize);
WriteChunkHeader(chunkHeader);
WriteFrames(waveForm);
}
/// <summary>
/// Writes the chunk describing the waveform format to the underlying stream.
/// </summary>
/// <param name="waveFormFormat">The waveform format.</param>
private void WriteFormatChunk(WaveformFormat waveFormFormat)
{
var chunkSize = WaveformFileFormat.FormatChunkPayloadSize;
var chunkHeader = new WaveformFileFormat.ChunkHeader(WaveformFileFormat.FormatChunkId, chunkSize);
WriteChunkHeader(chunkHeader);
_stream.WriteInt16(WaveformFileFormat.PcmFormatTag);
_stream.WriteInt16(waveFormFormat.ChannelsCount);
_stream.WriteInt32(waveFormFormat.SamplesPerSecond);
_stream.WriteInt32(waveFormFormat.BytesPerSecond);
_stream.WriteInt16(waveFormFormat.FrameSize);
_stream.WriteInt16(waveFormFormat.BitsPerSample);
}
/// <summary>
/// Writes the header of any arbitray chunk to the underlying stream.
/// </summary>
/// <param name="chunkHeader">The chunk header.</param>
private void WriteChunkHeader(WaveformFileFormat.ChunkHeader chunkHeader)
{
_stream.WriteString(chunkHeader.Id);
_stream.WriteInt32(chunkHeader.PayloadSize);
}
