/// <summary>
/// Scan <paramref name="sndfile"/> file and return single peak value for each channel.
/// </summary>
/// <param name="sndfile">Audio file we want to scan.</param>
/// <param name="channels">Number of audio channels in the audio file.</param>
/// <returns>Peak values for each channel.</returns>
public double[] CalcMaxAllChannels(IntPtr sndfile, int channels)
{
if (sndfile == IntPtr.Zero)
{
throw new ArgumentException("File handle is invalid/closed.");
}
if (channels <= 0)
{
throw new ArgumentOutOfRangeException("channels", channels, "Channels must be greater than zero.");
}
var max = m_Api.CalcMaxAllChannels(sndfile, channels);
if (max == null || max.Length == 0)
{
throw new LibsndfileException("Unable to retrieve signal max for all channels.");
}
return(max);
}