mirror of
https://github.com/crskycode/GARbro.git
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253 lines
9.4 KiB
C#
253 lines
9.4 KiB
C#
//! \file AudioNWA.cs
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//! \date Mon Apr 18 15:10:59 2016
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//! \brief RealLive 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.ComponentModel.Composition;
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using System.IO;
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using GameRes.Utility;
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namespace GameRes.Formats.RealLive
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{
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internal class NwaMetaData
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{
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public WaveFormat Format;
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public int Compression;
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public bool RunLengthEncoded;
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public int BlockCount;
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public int PcmSize;
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public int PackedSize;
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public int SampleCount;
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public int BlockSize;
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public int FinalBlockSize;
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}
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[Export(typeof(AudioFormat))]
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public class NwaAudio : AudioFormat
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{
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public override string Tag { get { return "NWA"; } }
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public override string Description { get { return "RealLive engine audio format"; } }
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public override uint Signature { get { return 0; } }
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public override SoundInput TryOpen (Stream file)
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{
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var header = new byte[0x28];
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if (header.Length != file.Read (header, 0, header.Length))
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return null;
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ushort channels = LittleEndian.ToUInt16 (header, 0);
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if (0 == channels || channels > 2)
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return null;
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ushort bps = LittleEndian.ToUInt16 (header, 2);
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if (bps != 8 && bps != 16)
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return null;
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var info = new NwaMetaData
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{
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Compression = LittleEndian.ToInt32 (header, 8),
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RunLengthEncoded = 0 != LittleEndian.ToInt32 (header, 0xC),
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BlockCount = LittleEndian.ToInt32 (header, 0x10),
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PcmSize = LittleEndian.ToInt32 (header, 0x14),
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PackedSize = LittleEndian.ToInt32 (header, 0x18),
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SampleCount = LittleEndian.ToInt32 (header, 0x1C),
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BlockSize = LittleEndian.ToInt32 (header, 0x20),
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FinalBlockSize = LittleEndian.ToInt32 (header, 0x24),
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};
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if (info.PcmSize <= 0)
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return null;
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info.Format.FormatTag = 1;
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info.Format.Channels = channels;
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info.Format.BitsPerSample = bps;
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info.Format.SamplesPerSecond = LittleEndian.ToUInt32 (header, 4);
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info.Format.BlockAlign = (ushort)(channels * bps/8);
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info.Format.AverageBytesPerSecond = info.Format.BlockAlign * info.Format.SamplesPerSecond;
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if (-1 == info.Compression)
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{
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if (info.PcmSize > file.Length - 0x2C)
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return null;
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return new RawPcmInput (new StreamRegion (file, 0x2C, info.PcmSize), info.Format);
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}
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if (info.Compression > 5)
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return null;
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if (info.PcmSize != info.SampleCount * bps / 8)
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return null;
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using (var decoder = new NwaDecoder (file, info))
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{
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decoder.Decode();
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var pcm = new MemoryStream (decoder.Output);
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var sound = new RawPcmInput (pcm, info.Format);
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file.Dispose();
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return sound;
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}
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}
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}
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internal sealed class NwaDecoder : IDisposable
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{
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BinaryReader m_input;
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byte[] m_output;
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NwaMetaData m_info;
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short[] m_sample;
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LsbBitStream m_bits;
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public byte[] Output { get { return m_output; } }
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public NwaDecoder (Stream input, NwaMetaData info)
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{
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m_input = new ArcView.Reader (input);
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m_info = info;
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m_output = new byte[m_info.PcmSize];
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m_sample = new short[2];
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m_bits = new LsbBitStream (input, true);
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}
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int m_dst;
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public void Decode ()
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{
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m_input.BaseStream.Position = 0x2C;
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var offsets = new uint[m_info.BlockCount];
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for (int i = 0; i < offsets.Length; ++i)
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offsets[i] = m_input.ReadUInt32();
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m_dst = 0;
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for (int i = 0; i < offsets.Length-1; ++i)
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{
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m_input.BaseStream.Position = offsets[i];
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DecodeBlock (m_info.BlockSize);
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}
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m_input.BaseStream.Position = offsets[offsets.Length-1];
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if (m_info.FinalBlockSize > 0)
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DecodeBlock (m_info.FinalBlockSize);
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else
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DecodeBlock (m_info.BlockSize);
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}
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void DecodeBlock (int block_size)
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{
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int channel_count = m_info.Format.Channels;
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for (int c = 0; c < channel_count; ++c)
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{
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if (8 == m_info.Format.BitsPerSample)
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m_sample[c] = m_input.ReadByte();
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else
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m_sample[c] = m_input.ReadInt16();
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}
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m_bits.Reset();
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int channel = 0;
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int repeat_count = 0;
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for (int i = 0; i < block_size; ++i)
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{
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if (0 == repeat_count)
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{
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int ctl = m_bits.GetBits (3);
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if (7 == ctl)
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{
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if (1 == m_bits.GetNextBit())
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{
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m_sample[channel] = 0;
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}
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else
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{
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int bits = 8;
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int shift = 9;
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if (m_info.Compression < 3)
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{
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bits -= m_info.Compression;
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shift += m_info.Compression;
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}
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int sign_bit = 1 << (bits - 1);
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int mask = sign_bit - 1;
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int val = m_bits.GetBits (bits);
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if (0 != (val & sign_bit))
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m_sample[channel] -= (short)((val & mask) << shift);
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else
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m_sample[channel] += (short)((val & mask) << shift);
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}
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}
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else if (ctl != 0)
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{
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int bits, shift;
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if (m_info.Compression < 3)
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{
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bits = 5 - m_info.Compression;
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shift = 2 + ctl + m_info.Compression;
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}
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else
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{
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bits = 3 + m_info.Compression;
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shift = 1 + ctl;
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}
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int sign_bit = 1 << (bits - 1);
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int mask = sign_bit - 1;
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int val = m_bits.GetBits (bits);
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if (0 != (val & sign_bit))
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m_sample[channel] -= (short)((val & mask) << shift);
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else
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m_sample[channel] += (short)((val & mask) << shift);
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}
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else if (m_info.RunLengthEncoded)
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{
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repeat_count = m_bits.GetNextBit();
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if (1 == repeat_count)
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{
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repeat_count = m_bits.GetBits (2);
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if (3 == repeat_count)
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repeat_count = m_bits.GetBits (8);
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}
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}
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}
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else
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{
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--repeat_count;
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}
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if (8 == m_info.Format.BitsPerSample)
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{
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m_output[m_dst++] = (byte)m_sample[channel];
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}
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else
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{
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LittleEndian.Pack (m_sample[channel], m_output, m_dst);
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m_dst += 2;
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}
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if (2 == channel_count)
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channel ^= 1;
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}
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}
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#region IDisposable Members
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bool _disposed = false;
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public void Dispose ()
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{
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if (!_disposed)
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{
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m_bits.Dispose();
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m_input.Dispose();
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_disposed = true;
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}
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}
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#endregion
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}
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}
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