/*************************************************************************** * Copyright 2005 Raphaƫl Slinckx ****************************************************************************/ /* THIS FILE IS LICENSED UNDER THE MIT LICENSE AS OUTLINED IMMEDIATELY BELOW: * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. */ using System; using System.IO; using Entagged.Audioformats.Util; using Entagged.Audioformats.Exceptions; namespace Entagged.Audioformats.Ape.Util { public class MonkeyInfoReader { public EncodingInfo Read( Stream raf ) { EncodingInfo info = new EncodingInfo(); //Begin info fetch------------------------------------------- if ( raf.Length == 0 ) { //Empty File throw new CannotReadException("File is empty"); } raf.Seek( 0 , SeekOrigin.Begin); //MP+ Header string byte[] b = new byte[4]; raf.Read(b, 0, b.Length); string mpc = new string(System.Text.Encoding.ASCII.GetChars(b)); if (mpc != "MAC ") { throw new CannotReadException("'MAC ' Header not found"); } b = new byte[4]; raf.Read(b, 0, b.Length); int version = Utils.GetNumber(b, 0,3); if(version < 3970) throw new CannotReadException("Monkey Audio version <= 3.97 is not supported"); b = new byte[44]; raf.Read(b, 0, b.Length); MonkeyDescriptor md = new MonkeyDescriptor(b); b = new byte[24]; raf.Read(b, 0, b.Length); MonkeyHeader mh = new MonkeyHeader(b); raf.Seek(md.RiffWavOffset, SeekOrigin.Begin); b = new byte[12]; raf.Read(b, 0, b.Length); WavRIFFHeader wrh = new WavRIFFHeader(b); if(!wrh.Valid) throw new CannotReadException("No valid RIFF Header found"); b = new byte[24]; raf.Read(b, 0, b.Length); WavFormatHeader wfh = new WavFormatHeader(b); if(!wfh.Valid) throw new CannotReadException("No valid WAV Header found"); info.Duration = new TimeSpan(mh.Length * TimeSpan.TicksPerSecond); info.ChannelNumber = wfh.ChannelNumber; info.SamplingRate = wfh.SamplingRate; info.Bitrate = ComputeBitrate(mh.Length, raf.Length); info.EncodingType = "Monkey Audio v" + (((double)version)/1000)+", compression level "+mh.CompressionLevel; info.ExtraEncodingInfos = ""; return info; } private int ComputeBitrate( int length, long size ) { return (int) ( ( size / 1000 ) * 8 / length ); } } }