public void close()
{
#if DEBUG
sout.println("WaveWriter#close; m_path=" + m_path);
#endif
if (m_stream == null)
{
return;
}
try {
// 最後にWAVEチャンクのサイズ
int position = (int)m_stream.Position;
m_stream.Seek(4, SeekOrigin.Begin);
byte[] buf = PortUtil.getbytes_uint32_le(position - 8);
writeByteArray(m_stream, buf, 4);
// size of data chunk
int block_size = (int)(m_bit_per_sample / 8 * (int)m_channel);
long size = block_size * m_total_samples;
m_stream.Seek(42, SeekOrigin.Begin);
buf = PortUtil.getbytes_uint32_le(size);
writeByteArray(m_stream, buf, 4);
m_stream.Close();
} catch (Exception ex) {
serr.println("WaveWriter#close; ex=" + ex);
}
}
/// <summary>
/// Writes header of WAVE file
/// </summary>
private void writeHeader()
{
// RIFF
m_stream.WriteByte(0x52); // loc=0x00
m_stream.WriteByte(0x49);
m_stream.WriteByte(0x46);
m_stream.WriteByte(0x46);
// ファイルサイズ - 8最後に記入
m_stream.WriteByte(0x00); // loc=0x04
m_stream.WriteByte(0x00);
m_stream.WriteByte(0x00);
m_stream.WriteByte(0x00);
// WAVE
m_stream.WriteByte(0x57); // loc=0x08
m_stream.WriteByte(0x41);
m_stream.WriteByte(0x56);
m_stream.WriteByte(0x45);
// fmt
m_stream.WriteByte(0x66); // loc=0x0c
m_stream.WriteByte(0x6d);
m_stream.WriteByte(0x74);
m_stream.WriteByte(0x20);
// fmt チャンクのサイズ
m_stream.WriteByte(0x12); // loc=0x10
m_stream.WriteByte(0x00);
m_stream.WriteByte(0x00);
m_stream.WriteByte(0x00);
// format ID
m_stream.WriteByte(0x01); // loc=0x14
m_stream.WriteByte(0x00);
// チャンネル数
if (m_channel == 1)
{
m_stream.WriteByte(0x01); // loc=0x16
m_stream.WriteByte(0x00);
}
else
{
m_stream.WriteByte(0x02); //loc=0x16
m_stream.WriteByte(0x00);
}
// サンプリングレート
byte[] buf = PortUtil.getbytes_uint32_le(m_sample_rate);
writeByteArray(m_stream, buf, 4); // 0x18
// データ速度
int block_size = (int)(m_bit_per_sample / 8 * (int)m_channel);
int data_rate = m_sample_rate * block_size;
buf = PortUtil.getbytes_uint32_le(data_rate);
writeByteArray(m_stream, buf, 4);//loc=0x1c
// ブロックサイズ
buf = PortUtil.getbytes_uint16_le(block_size);
writeByteArray(m_stream, buf, 2); //0x20
// サンプルあたりのビット数
buf = PortUtil.getbytes_uint16_le(m_bit_per_sample);
writeByteArray(m_stream, buf, 2); //loc=0x22
// 拡張部分
m_stream.WriteByte(0x00); //loc=0x24
m_stream.WriteByte(0x00);
// data
m_stream.WriteByte(0x64); //loc=0x26
m_stream.WriteByte(0x61);
m_stream.WriteByte(0x74);
m_stream.WriteByte(0x61);
// size of data chunk
long size = block_size * m_total_samples;
buf = PortUtil.getbytes_uint32_le(size);
writeByteArray(m_stream, buf, 4);
m_pos_data_chunk = m_stream.Position;
}
