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229 lines
8.6 KiB
C#
229 lines
8.6 KiB
C#
//! \file ArcMGS.cs
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//! \date 2017 Nov 21
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//! \brief MEGU audio archive implementation.
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//
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// Copyright (C) 2015-2017 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.Formats.Abogado;
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using GameRes.Utility;
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namespace GameRes.Formats.Megu
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{
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internal class MgsEntry : Entry
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{
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public ushort Channels;
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public uint SamplesPerSecond;
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public ushort BitsPerSample;
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public byte Format;
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}
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[Export(typeof(ArchiveFormat))]
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public class MgsOpener : ArchiveFormat
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{
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public override string Tag { get { return "MGS"; } }
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public override string Description { get { return "Masys audio resources archive"; } }
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public override uint Signature { get { return 0; } }
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public override bool IsHierarchic { get { return false; } }
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public override bool CanWrite { get { return false; } }
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public override ArcFile TryOpen (ArcView file)
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{
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if (!file.View.AsciiEqual (0, "MGS"))
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return null;
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int count = file.View.ReadInt16 (0x20);
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if (!IsSaneCount (count))
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return null;
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int flag = file.View.ReadUInt16 (3);
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var dir = new List<Entry> (count);
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int index_offset = 0x22;
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byte[] name_buf = new byte[16];
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for (int i = 0; i < count; ++i)
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{
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byte format = file.View.ReadByte (index_offset);
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int name_size = file.View.ReadByte (index_offset+9);
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if (0 == name_size)
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return null;
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if (name_size > name_buf.Length)
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Array.Resize (ref name_buf, name_size);
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file.View.Read (index_offset+10, name_buf, 0, (uint)name_size);
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if (100 == flag)
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MgdOpener.Decrypt (name_buf, 0, name_size);
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var name = Encodings.cp932.GetString (name_buf, 0, name_size);
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name = Path.ChangeExtension (name, GetExtFromFormatId (format));
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var entry = FormatCatalog.Instance.Create<MgsEntry> (name);
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entry.Format = format;
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if (0 == format)
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{
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entry.Channels = file.View.ReadUInt16 (index_offset+1);
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entry.SamplesPerSecond = file.View.ReadUInt32 (index_offset+3);
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entry.BitsPerSample = file.View.ReadUInt16 (index_offset+7);
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}
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index_offset += 10 + name_size;
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entry.Size = file.View.ReadUInt32 (index_offset);
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entry.Offset = file.View.ReadUInt32 (index_offset + 4);
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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dir.Add (entry);
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index_offset += 8;
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}
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return new ArcFile (file, this, dir);
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}
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public override Stream OpenEntry (ArcFile arc, Entry entry)
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{
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var went = entry as MgsEntry;
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if (null == went || went.Format != 0)
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return arc.File.CreateStream (entry.Offset, entry.Size);
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var format = new WaveFormat {
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FormatTag = 1,
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Channels = (ushort)(went.Channels & 0x7FFF),
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SamplesPerSecond = went.SamplesPerSecond,
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};
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Stream pcm;
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uint pcm_size;
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if (0 != (went.Channels & 0x8000))
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{
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format.BitsPerSample = 0x10;
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var decoder = new PcmDecoder (went);
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using (var input = arc.File.CreateStream (entry.Offset, entry.Size))
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{
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var data = decoder.Decode (input);
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pcm = new MemoryStream (data);
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pcm_size = (uint)data.Length;
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}
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}
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else
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{
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format.BitsPerSample = went.BitsPerSample;
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pcm = arc.File.CreateStream (entry.Offset, entry.Size);
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pcm_size = entry.Size;
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}
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using (var riff = new MemoryStream (0x2C))
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{
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ushort align = (ushort)(format.Channels * format.BitsPerSample / 8);
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format.AverageBytesPerSecond = went.SamplesPerSecond * align;
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format.BlockAlign = align;
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WaveAudio.WriteRiffHeader (riff, format, pcm_size);
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return new PrefixStream (riff.ToArray(), pcm);
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}
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}
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internal static string GetExtFromFormatId (int id)
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{
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switch (id)
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{
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case 0: return "wav";
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case 1: return "mid";
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default: return null;
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}
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}
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}
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internal sealed class PcmDecoder
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{
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int Channels;
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int BytesPerChunk;
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byte[] m_output;
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int m_dst;
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public PcmDecoder (MgsEntry went)
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{
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Channels = went.Channels & 0x7FFF;
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BytesPerChunk = went.BitsPerSample;
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int output_size;
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if (1 == Channels)
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output_size = (int)went.Size / BytesPerChunk * ((BytesPerChunk - 4) * 4 + 2);
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else
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output_size = (int)went.Size / BytesPerChunk * ((BytesPerChunk - 8) * 4 + 4);
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m_output = new byte[output_size];
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}
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void PutSample (short sample)
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{
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LittleEndian.Pack (sample, m_output, m_dst);
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m_dst += 2;
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}
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public byte[] Decode (IBinaryStream input)
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{
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m_dst = 0;
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if (1 == Channels)
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{
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var adp = new AdpDecoder();
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while (input.PeekByte() != -1)
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{
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short sample = input.ReadInt16();
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PutSample (sample);
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int quant_idx = input.ReadUInt16() & 0xFF;
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adp.Reset (sample, quant_idx);
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for (int j = 0; j < BytesPerChunk - 4; ++j)
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{
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byte octet = input.ReadUInt8();
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PutSample (adp.DecodeSample (octet));
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PutSample (adp.DecodeSample (octet >> 4));
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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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var first = new AdpDecoder();
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var second = new AdpDecoder();
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int samples_per_chunk = (BytesPerChunk - 8) / 8;
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while (input.PeekByte() != -1)
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{
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short sample = input.ReadInt16();
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PutSample (sample);
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int quant_idx = input.ReadUInt16() & 0xFF;
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first.Reset (sample, quant_idx);
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sample = input.ReadInt16();
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PutSample (sample);
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quant_idx = input.ReadUInt16() & 0xFF;
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second.Reset (sample, quant_idx);
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for (int j = 0; j < samples_per_chunk; ++j)
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{
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uint first_code = input.ReadUInt32();
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uint second_code = input.ReadUInt32();
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for (int i = 0; i < 8; ++i)
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{
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PutSample (first.DecodeSample ((byte)first_code));
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PutSample (second.DecodeSample ((byte)second_code));
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first_code >>= 4;
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second_code >>= 4;
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}
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}
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}
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}
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return m_output;
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}
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}
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}
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