private void WriteDataChunk(AudioSignalProperties audioProperties, long count, FileStream fs)
{
BinaryWriter writer = new BinaryWriter(fs);
writer.Write(new char[] { 'd', 'a', 't', 'a' });
writer.Write(audioProperties.CalculateSubchunk2Size(count));
return;
}
public void WriteAudioSignalPropertiesToFile(AudioSignalProperties audioProperties, long count, string filePath)
{
using (FileStream fs = File.Open(filePath, FileMode.Create))
{
WriteRIFFChunk(audioProperties, fs);
WriteFmtChunk(audioProperties, fs);
WriteDataChunk(audioProperties, count, fs);
}
}
private void WriteRIFFChunk(AudioSignalProperties audioProperties, FileStream fs)
{
BinaryWriter writer = new BinaryWriter(fs);
writer.Write(new char[] { 'R', 'I', 'F', 'F' });
writer.Write(audioProperties.CalculateHeaderSize());
writer.Write(new char[] { 'W', 'A', 'V', 'E' });
return;
}
public AudioSignal ReadAudioSignalFromFile(string filePath)
{
AudioSignal signal;
AudioSignalProperties audioProperties = ReadAudioSignalProperties(filePath);
double[] data = ReadAudioDataFromFile(filePath, audioProperties.CalculateHeaderSize(), audioProperties.BitsPerSample);
signal = new AudioSignal(audioProperties, data);
return(signal);
}
/// <summary>
/// Чтение заголовка набора банных из файла
/// </summary>
/// <param name="filePath"></param>
/// <returns></returns>
public AudioSignalProperties ReadAudioSignalProperties(string filePath)
{
AudioSignalProperties audioProperties;
using (FileStream fs = File.Open(filePath, FileMode.Open))
{
var riffChunck = ReadRIFFChunk(fs);
var fmtChunk = ReadFmtChunk(fs);
var dataChank = ReadDataChunk(fs);
audioProperties = new AudioSignalProperties(
fmtChunk.audioFormat,
fmtChunk.numChannels,
fmtChunk.sampleRate,
fmtChunk.bitsPerSample,
fmtChunk.extraParams
);
}
return(audioProperties);
}
private void WriteFmtChunk(AudioSignalProperties audioProperties, FileStream fs)
{
BinaryWriter writer = new BinaryWriter(fs);
writer.Write(new char[] { 'f', 'm', 't', ' ' });
writer.Write(audioProperties.CalculateSubchunk1Size());
writer.Write(audioProperties.AudioFormat);
writer.Write(audioProperties.NumChannels);
writer.Write(audioProperties.SampleRate);
writer.Write(audioProperties.GetByteRate());
writer.Write(audioProperties.GetBlockAlign());
writer.Write(audioProperties.BitsPerSample);
if (audioProperties.ExtraParams != null)
{
writer.Write((short)audioProperties.ExtraParams.Length);
writer.Write(audioProperties.ExtraParams);
}
return;
}
