using System.IO;

namespace MoonWorks.Audio
{
	public static class AudioUtils
	{
		public static Format ReadWaveFormat(string filePath, out int dataLength)
		{
			var fileInfo = new FileInfo(filePath);
			using FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
			using BinaryReader br = new BinaryReader(fs);

			fs.Position = 20;
			var formatTag = br.ReadInt16();
			fs.Position = 22;
			var channels = br.ReadInt16();
			fs.Position = 24;
			var sampleRate = br.ReadInt32();
			fs.Position = 34;
			var bitsPerSample = br.ReadInt16();
			fs.Position = 40;
			dataLength = br.ReadInt32();

			return new Format
			{
				Tag = (FormatTag) formatTag,
				Channels = (ushort) channels,
				SampleRate = (uint) sampleRate,
				BitsPerSample = (ushort) bitsPerSample
			};
		}
	}
}