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implemented various Leaf resources.
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morkt
269
ArcFormats/Leaf/AudioG.cs
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269
ArcFormats/Leaf/AudioG.cs
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//! \file AudioG.cs
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//! \date Thu Aug 18 15:50:27 2016
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//! \brief Leaf audio format.
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//
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// Copyright (C) 2016 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System;
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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using System.IO;
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using GameRes.Utility;
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namespace GameRes.Formats.Leaf
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{
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[Export(typeof(AudioFormat))]
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public class GAudio : AudioFormat
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{
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public override string Tag { get { return "G/Leaf"; } }
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public override string Description { get { return "Leaf audio format (Ogg/Vorbis)"; } }
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public override uint Signature { get { return 0; } }
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public GAudio ()
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{
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Extensions = new string[] { "g" };
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}
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public override SoundInput TryOpen (Stream file)
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{
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var header = new byte[0x1C];
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if (header.Length != file.Read (header, 0, header.Length))
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return null;
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if (header[4] != 0 || header[5] != 2 || LittleEndian.ToInt64 (header, 6) != 0)
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return null;
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file.Position = 0;
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var input = new GStream (file);
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return new OggInput (new SeekableStream (input));
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}
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}
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internal class GStream : InputProxyStream
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{
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IEnumerator<int> m_pages;
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bool m_eof;
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byte[] m_page = new byte[0x10000];
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int m_page_pos = 0;
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int m_page_length = 0;
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public GStream (Stream source) : base (source)
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{
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m_pages = EnumeratePages();
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m_eof = false;
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}
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#region IO.Stream methods
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public override bool CanSeek { get { return false; } }
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public override long Length { get { throw new NotSupportedException(); } }
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public override long Position
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{
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get { throw new NotSupportedException(); }
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set { throw new NotSupportedException(); }
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}
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public override long Seek (long offset, SeekOrigin origin)
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{
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throw new NotSupportedException();
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}
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#endregion
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public override int Read (byte[] buffer, int offset, int count)
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{
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int total_read = 0;
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while (count > 0 && !m_eof)
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{
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if (m_page_pos == m_page_length)
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{
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NextPage();
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}
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if (m_eof)
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break;
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int available = Math.Min (m_page_length - m_page_pos, count);
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Buffer.BlockCopy (m_page, m_page_pos, buffer, offset, available);
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m_page_pos += available;
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offset += available;
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count -= available;
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total_read += available;
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}
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return total_read;
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}
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void NextPage ()
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{
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m_eof = !m_pages.MoveNext();
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m_page_pos = 0;
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m_page_length = !m_eof ? m_pages.Current : 0;
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}
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enum State
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{
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Header,
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Comment,
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Setup,
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Payload,
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Broken,
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};
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IEnumerator<int> EnumeratePages ()
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{
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var state = State.Header;
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for (;;)
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{
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int page_length = 0x1B;
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int read = BaseStream.Read (m_page, 0, page_length);
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if (read < page_length)
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{
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if (read != 0)
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yield return read;
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yield break;
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}
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PutString (0, "OggS");
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int segment_count = m_page[0x1A];
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if (0 == segment_count)
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{
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UpdateCrc (page_length);
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yield return page_length;
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continue;
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}
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read = BaseStream.Read (m_page, page_length, segment_count);
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page_length += read;
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if (read < segment_count)
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{
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UpdateCrc (page_length);
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yield return page_length;
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yield break;
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}
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int segments_size = 0;
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for (int i = 0; i < segment_count; ++i)
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{
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segments_size += m_page[0x1B+i];
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}
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int id, next;
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switch (state)
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{
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case State.Header:
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id = BaseStream.ReadByte();
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if (-1 == id)
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break;
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m_page[page_length++] = (byte)id;
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next = BaseStream.ReadByte();
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segments_size -= 2;
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if (1 == id)
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{
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PutString (page_length, "vorbis");
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page_length += 6;
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m_page[0x1B] += 5;
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state = State.Comment;
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}
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else
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{
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m_page[page_length++] = (byte)next;
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state = State.Broken;
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}
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break;
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case State.Comment:
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id = BaseStream.ReadByte();
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if (-1 == id)
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break;
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m_page[page_length++] = (byte)id;
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next = BaseStream.ReadByte();
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segments_size -= 2;
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if (3 == id)
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{
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PutString (page_length, "vorbis");
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page_length += 6;
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read = BaseStream.Read (m_page, page_length, m_page[0x1B]-2);
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page_length += read;
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segments_size -= read;
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m_page[0x1B] += 5;
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state = State.Setup;
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if (segments_size > 0)
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goto case State.Setup;
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}
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else
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{
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m_page[page_length++] = (byte)next;
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state = State.Broken;
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}
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break;
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case State.Setup:
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id = BaseStream.ReadByte();
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if (-1 == id)
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break;
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m_page[page_length++] = (byte)id;
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next = BaseStream.ReadByte();
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segments_size -= 2;
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if (5 == id)
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{
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PutString (page_length, "vorbis");
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page_length += 6;
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m_page[0x1B+segment_count-1] += 5;
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state = State.Payload;
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}
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else
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{
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m_page[page_length++] = (byte)next;
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state = State.Broken;
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}
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break;
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}
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read = BaseStream.Read (m_page, page_length, segments_size);
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page_length += read;
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UpdateCrc (page_length);
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yield return page_length;
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}
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}
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void PutString (int pos, string s)
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{
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for (int i = 0; i < s.Length; ++i)
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m_page[pos+i] = (byte)s[i];
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}
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void UpdateCrc (int page_length)
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{
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LittleEndian.Pack (0, m_page, 0x16);
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uint crc = Crc32Normal.UpdateCrc (0, m_page, 0, page_length);
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LittleEndian.Pack (crc, m_page, 0x16);
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}
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#region IDisposable Members
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bool _g_disposed = false;
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protected override void Dispose (bool disposing)
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{
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if (_g_disposed)
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return;
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if (disposing)
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{
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m_pages.Dispose();
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}
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_g_disposed = true;
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base.Dispose (disposing);
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}
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#endregion
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}
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}
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