/// <summary>
/// Loads previously generated peaks from disk.
/// </summary>
internal WavePeakData LoadPeaks()
{
if (_header.BitsPerSample != 16)
{
throw new Exception("Peaks file must be 16 bits per sample.");
}
if (_header.NumberOfChannels != 1 && _header.NumberOfChannels != 2)
{
throw new Exception("Peaks file must have 1 or 2 channels.");
}
// load data
byte[] data = new byte[_header.DataChunkSize];
_stream.Position = _header.DataStartPosition;
_stream.Read(data, 0, data.Length);
// read peak values
WavePeak[] peaks = new WavePeak[_header.LengthInSamples];
int peakIndex = 0;
if (_header.NumberOfChannels == 2)
{
// max value in left channel, min value in right channel
int byteIndex = 0;
while (byteIndex < data.Length)
{
short max = (short)ReadValue16Bit(data, ref byteIndex);
short min = (short)ReadValue16Bit(data, ref byteIndex);
peaks[peakIndex++] = new WavePeak(max, min);
}
}
else
{
// single sample value (for backwards compatibility)
int byteIndex = 0;
while (byteIndex < data.Length)
{
short value = (short)ReadValue16Bit(data, ref byteIndex);
if (value == short.MinValue)
{
value = -short.MaxValue;
}
value = Math.Abs(value);
peaks[peakIndex++] = new WavePeak(value, (short)-value);
}
}
return(new WavePeakData(_header.SampleRate, peaks));
}
/// <summary>
/// Loads previously generated peaks from disk.
/// </summary>
internal WavePeakData LoadPeaks()
{
if (_header.BitsPerSample != 16)
throw new Exception("Peaks file must be 16 bits per sample.");
if (_header.NumberOfChannels != 1 && _header.NumberOfChannels != 2)
throw new Exception("Peaks file must have 1 or 2 channels.");
// load data
byte[] data = new byte[_header.DataChunkSize];
_stream.Position = _header.DataStartPosition;
_stream.Read(data, 0, data.Length);
// read peak values
WavePeak[] peaks = new WavePeak[_header.LengthInSamples];
int peakIndex = 0;
if (_header.NumberOfChannels == 2)
{
// max value in left channel, min value in right channel
int byteIndex = 0;
while (byteIndex < data.Length)
{
short max = (short)ReadValue16Bit(data, ref byteIndex);
short min = (short)ReadValue16Bit(data, ref byteIndex);
peaks[peakIndex++] = new WavePeak(max, min);
}
}
else if (_header.NumberOfChannels == 1)
{
// single sample value (for backwards compatibility)
int byteIndex = 0;
while (byteIndex < data.Length)
{
short value = (short)ReadValue16Bit(data, ref byteIndex);
if (value == short.MinValue)
value = -short.MaxValue;
value = Math.Abs(value);
peaks[peakIndex++] = new WavePeak(value, (short)-value);
}
}
return new WavePeakData(_header.SampleRate, peaks);
}