mirror of
https://github.com/crskycode/GARbro.git
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1187 lines
46 KiB
C#
1187 lines
46 KiB
C#
//! \file AudioMIO.cs
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//! \date Thu May 28 13:33:07 2015
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//! \brief Entis audio format implementation.
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//
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// Copyright (C) 2015 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.Diagnostics;
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using System.IO;
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using GameRes.Utility;
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namespace GameRes.Formats.Entis
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{
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[Export(typeof(AudioFormat))]
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public class MioAudio : AudioFormat
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{
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public override string Tag { get { return "MIO"; } }
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public override string Description { get { return "Entis engine compressed audio format"; } }
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public override uint Signature { get { return 0x69746e45u; } } // 'Enti'
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public override SoundInput TryOpen (Stream file)
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{
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byte[] header = new byte[0x40];
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if (header.Length != file.Read (header, 0, header.Length))
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return null;
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if (0x03000100 != LittleEndian.ToUInt32 (header, 8))
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return null;
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if (!Binary.AsciiEqual (header, 0x10, "Music Interleaved and Orthogonal transformed"))
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return null;
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return new MioInput (file);
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}
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}
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public class MioInput : SoundInput
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{
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EriFile m_erif;
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MioInfoHeader m_info;
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long m_stream_pos;
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int m_bitrate;
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uint m_total_samples;
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ERISADecodeContext m_pmioc;
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MioDecoder m_pmiod;
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Stream m_decoded_stream;
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public int ChannelCount { get { return m_info.ChannelCount; } }
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public uint BitsPerSample { get { return m_info.BitsPerSample; } }
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public override int SourceBitrate { get { return m_bitrate; } }
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public override string SourceFormat { get { return "raw"; } }
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#region Stream Members
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public override bool CanSeek { get { return Source.CanSeek; } }
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public override long Position
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{
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get { return m_decoded_stream.Position; }
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set { m_decoded_stream.Position = value; }
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}
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public override int Read (byte[] buffer, int offset, int count)
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{
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return m_decoded_stream.Read (buffer, offset, count);
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}
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#endregion
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public MioInput (Stream file) : base (file)
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{
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file.Position = 0x40;
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m_erif = new EriFile (file);
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try
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{
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var section = m_erif.ReadSection();
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if (section.Id != "Header " || section.Length <= 0 || section.Length > int.MaxValue)
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throw new InvalidFormatException();
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m_stream_pos = 0x50 + section.Length;
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int header_size = (int)section.Length;
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while (header_size > 8)
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{
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section = m_erif.ReadSection();
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header_size -= 8;
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if (section.Length <= 0 || section.Length > header_size)
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break;
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if ("SoundInf" == section.Id)
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{
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m_info = new MioInfoHeader();
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m_info.Version = m_erif.ReadInt32();
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m_info.Transformation = (CvType)m_erif.ReadInt32();
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m_info.Architecture = (EriCode)m_erif.ReadInt32();
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m_info.ChannelCount = m_erif.ReadInt32();
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m_info.SamplesPerSec = m_erif.ReadUInt32();
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m_info.BlocksetCount = m_erif.ReadUInt32();
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m_info.SubbandDegree = m_erif.ReadInt32();
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m_info.AllSampleCount = m_erif.ReadUInt32();
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m_info.LappedDegree = m_erif.ReadUInt32();
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m_info.BitsPerSample = m_erif.ReadUInt32();
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break;
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}
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header_size -= (int)section.Length;
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m_erif.BaseStream.Seek (section.Length, SeekOrigin.Current);
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}
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if (null == m_info)
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throw new InvalidFormatException ("MIO sound header not found");
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m_erif.BaseStream.Position = m_stream_pos;
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var stream_size = m_erif.FindSection ("Stream ");
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m_stream_pos = m_erif.BaseStream.Position;
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m_pmiod = new MioDecoder (m_info);
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m_pmioc = new HuffmanDecodeContext (0x10000);
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int pcm_bitrate = (int)m_info.SamplesPerSec * 16 * m_info.ChannelCount;
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var format = new GameRes.WaveFormat();
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format.FormatTag = 1;
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format.Channels = (ushort)m_info.ChannelCount;
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format.SamplesPerSecond = m_info.SamplesPerSec;
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format.BitsPerSample = 16;
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format.BlockAlign = (ushort)(2*format.Channels);
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format.AverageBytesPerSecond = (uint)pcm_bitrate/8;
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this.Format = format;
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m_decoded_stream = LoadChunks();
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if (0 != m_total_samples)
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m_bitrate = (int)(stream_size * 8 * m_info.SamplesPerSec / m_total_samples);
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this.PcmSize = m_decoded_stream.Length;
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m_decoded_stream.Position = 0;
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}
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catch
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{
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m_erif.Dispose();
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throw;
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}
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}
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class MioChunk : MioDataHeader
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{
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public uint FirstSample;
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public long Position;
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public uint Size;
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}
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class ChunkStream : Stream
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{
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Stream m_source;
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MioChunk m_chunk;
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public ChunkStream (Stream source, MioChunk chunk)
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{
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m_source = source;
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m_chunk = chunk;
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m_source.Position = m_chunk.Position;
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}
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public override bool CanRead { get { return true; } }
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public override bool CanWrite { get { return false; } }
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public override bool CanSeek { get { return m_source.CanSeek; } }
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public override long Length { get { return m_chunk.Size; } }
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public override long Position
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{
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get { return m_source.Position-m_chunk.Position; }
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set { Seek (value, SeekOrigin.Begin); }
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}
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public override long Seek (long offset, SeekOrigin origin)
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{
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if (origin == SeekOrigin.Begin)
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offset += m_chunk.Position;
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else if (origin == SeekOrigin.Current)
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offset += m_source.Position;
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else
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offset += m_chunk.Position + m_chunk.Size;
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if (offset < m_chunk.Position)
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offset = m_chunk.Position;
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m_source.Position = offset;
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return offset - m_chunk.Position;
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}
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public override void Flush()
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{
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m_source.Flush();
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}
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public override int Read (byte[] buf, int index, int count)
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{
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long remaining = (m_chunk.Position + m_chunk.Size) - m_source.Position;
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if (count > remaining)
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count = (int)remaining;
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if (count <= 0)
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return 0;
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return m_source.Read (buf, index, count);
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}
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public override void SetLength (long length)
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{
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throw new System.NotSupportedException ();
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}
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public override void Write (byte[] buffer, int offset, int count)
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{
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throw new System.NotSupportedException ();
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}
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public override void WriteByte (byte value)
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{
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throw new System.NotSupportedException ();
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}
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}
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private Stream LoadChunks ()
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{
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uint current_sample = 0;
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List<MioChunk> chunks = new List<MioChunk>();
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try
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{
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m_erif.BaseStream.Position = m_stream_pos;
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for (;;)
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{
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long chunk_length = m_erif.FindSection ("SoundStm");
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if (chunk_length > int.MaxValue)
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throw new FileSizeException();
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var chunk = new MioChunk();
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chunk.FirstSample = current_sample;
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chunk.Version = m_erif.ReadByte();
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chunk.Flags = m_erif.ReadByte();
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m_erif.ReadInt16();
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chunk.SampleCount = m_erif.ReadUInt32();
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chunk.Position = m_erif.BaseStream.Position;
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chunk.Size = (uint)(chunk_length - 8);
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current_sample += chunk.SampleCount;
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chunks.Add (chunk);
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m_erif.BaseStream.Seek (chunk.Size, SeekOrigin.Current);
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}
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}
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catch (EndOfStreamException) { /* ignore EOF errors */ }
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m_total_samples = current_sample;
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if (0 == m_total_samples)
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return Stream.Null;
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uint sample_bytes = (uint)ChannelCount * BitsPerSample / 8;
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var total_bytes = m_total_samples * sample_bytes;
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var wave_buf = new byte[total_bytes];
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int current_pos = 0;
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foreach (var chunk in chunks)
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{
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using (var input = new ChunkStream (Source, chunk))
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{
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m_pmioc.AttachInputFile (input);
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if (!m_pmiod.DecodeSound (m_pmioc, chunk, wave_buf, current_pos))
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throw new InvalidFormatException();
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current_pos += (int)(chunk.SampleCount * sample_bytes);
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}
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}
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return new MemoryStream (wave_buf);
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}
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#region IDisposable Members
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protected override void Dispose (bool disposing)
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{
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if (null != m_erif)
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{
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if (disposing)
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{
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m_erif.Dispose();
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if (m_decoded_stream != null)
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m_decoded_stream.Dispose();
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}
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m_erif = null;
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base.Dispose (disposing);
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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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E R I S A - L i b r a r y
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-----------------------------------------------------------------------------
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Copyright (C) 2002-2007 Leshade Entis, Entis-soft. All rights reserved.
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*****************************************************************************/
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internal class MioInfoHeader
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{
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public int Version;
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public CvType Transformation;
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public EriCode Architecture;
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public int ChannelCount;
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public uint SamplesPerSec;
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public uint BlocksetCount;
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public int SubbandDegree;
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public uint AllSampleCount;
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public uint LappedDegree;
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public uint BitsPerSample;
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}
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internal class MioDataHeader
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{
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public byte Version;
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public byte Flags;
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public uint SampleCount;
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}
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internal struct EriSinCos
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{
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public float rSin;
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public float rCos;
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}
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internal class MioDecoder
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{
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MioInfoHeader m_mioih;
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uint m_nBufLength = 0;
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int[] m_ptrBuffer1;
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int[] m_ptrBuffer2;
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sbyte[] m_ptrBuffer3;
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byte[] m_ptrDivisionTable;
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byte[] m_ptrRevolveCode;
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int[] m_ptrWeightCode;
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int[] m_ptrCoefficient;
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float[] m_ptrMatrixBuf;
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float[] m_ptrInternalBuf;
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float[] m_ptrWorkBuf;
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float[] m_ptrWorkBuf2;
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float[] m_ptrWeightTable;
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float[] m_ptrLastDCT;
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int m_ptrNextDivision;
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byte[] m_ptrNextRevCode;
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int m_ptrNextWeight;
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int m_ptrNextCoefficient;
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int m_ptrNextSource;
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int m_ptrLastDCTBuf;
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int m_nSubbandDegree;
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uint m_nDegreeNum;
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EriSinCos[] m_pRevolveParam;
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readonly int[] m_nFrequencyPoint = new int[7];
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const int MIN_DCT_DEGREE = 2;
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const int MAX_DCT_DEGREE = 12;
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static MioDecoder ()
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{
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eriInitializeMatrix();
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}
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public MioDecoder (MioInfoHeader info)
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{
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m_nBufLength = 0;
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m_mioih = info;
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if (!Initialize())
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throw new InvalidFormatException();
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}
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bool Initialize ()
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{
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if ((m_mioih.ChannelCount != 1) && (m_mioih.ChannelCount != 2))
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{
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return false;
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}
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if (m_mioih.Transformation == CvType.Lossless_ERI)
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{
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if (m_mioih.Architecture != EriCode.RunlengthHuffman)
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{
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return false;
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}
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if ((m_mioih.BitsPerSample != 8) && (m_mioih.BitsPerSample != 16))
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{
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return false;
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}
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}
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else if ((m_mioih.Transformation == CvType.LOT_ERI)
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|| (m_mioih.Transformation == CvType.LOT_ERI_MSS))
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{
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if ((m_mioih.Architecture != EriCode.RunlengthGamma)
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&& (m_mioih.Architecture != EriCode.RunlengthHuffman)
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&& (m_mioih.Architecture != EriCode.Nemesis))
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{
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return false;
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}
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if (m_mioih.BitsPerSample != 16)
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{
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return false;
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}
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if ((m_mioih.SubbandDegree < 8) || (m_mioih.SubbandDegree > MAX_DCT_DEGREE))
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{
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return false;
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}
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if (m_mioih.LappedDegree != 1)
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{
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return false;
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}
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int subband = (sizeof(float) << m_mioih.SubbandDegree) / sizeof(float);
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int block_size = m_mioih.ChannelCount * subband;
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m_ptrBuffer1 = new int[block_size];
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m_ptrMatrixBuf = new float[block_size];
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m_ptrInternalBuf = new float[block_size];
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m_ptrWorkBuf = new float[subband];
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m_ptrWorkBuf2 = new float[subband];
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m_ptrWeightTable = new float[subband];
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uint nBlocksetSamples = (uint)(m_mioih.ChannelCount << m_mioih.SubbandDegree);
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uint nLappedSamples = nBlocksetSamples * m_mioih.LappedDegree;
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if (nLappedSamples > 0)
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{
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m_ptrLastDCT = new float[nLappedSamples];
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}
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InitializeWithDegree (m_mioih.SubbandDegree);
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}
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else
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{
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return false;
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}
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return true;
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}
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public bool DecodeSound (ERISADecodeContext context, MioDataHeader datahdr, byte[] ptrWaveBuf, int wave_pos)
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{
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context.FlushBuffer();
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if (m_mioih.Transformation == CvType.Lossless_ERI)
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{
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if (m_mioih.BitsPerSample == 8)
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{
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return DecodeSoundPCM8 (context, datahdr, ptrWaveBuf, wave_pos);
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}
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else if (m_mioih.BitsPerSample == 16)
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{
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return DecodeSoundPCM16 (context, datahdr, ptrWaveBuf, wave_pos);
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}
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}
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else if ((m_mioih.Transformation == CvType.LOT_ERI)
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|| (m_mioih.Transformation == CvType.LOT_ERI_MSS))
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{
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if ((m_mioih.ChannelCount != 2) || (m_mioih.Transformation == CvType.LOT_ERI))
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{
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return DecodeSoundDCT (context, datahdr, ptrWaveBuf, wave_pos);
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}
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else
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{
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return DecodeSoundDCT_MSS (context, datahdr, ptrWaveBuf, wave_pos);
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}
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}
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return false;
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}
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bool DecodeSoundPCM8 (ERISADecodeContext context, MioDataHeader datahdr, byte[] ptrWaveBuf, int wave_pos)
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{
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throw new NotImplementedException ("MioDecoder.DecodeSoundPCM8 not implemented");
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}
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bool DecodeSoundPCM16 (ERISADecodeContext context, MioDataHeader datahdr, byte[] ptrWaveBuf, int wave_pos)
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{
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throw new NotImplementedException ("MioDecoder.DecodeSoundPCM16 not implemented");
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}
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static readonly int[] FreqWidth = new int[7] { -6, -6, -5, -4, -3, -2, -1 };
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void InitializeWithDegree (int nSubbandDegree)
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{
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m_pRevolveParam = eriCreateRevolveParameter (nSubbandDegree);
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for (int i = 0, j = 0; i < 7; i ++)
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{
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int nFrequencyWidth = 1 << (nSubbandDegree + FreqWidth[i]);
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m_nFrequencyPoint[i] = j + (nFrequencyWidth / 2);
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j += nFrequencyWidth;
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}
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m_nSubbandDegree = nSubbandDegree;
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m_nDegreeNum = (1u << nSubbandDegree);
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}
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const uint MIO_LEAD_BLOCK = 0x01;
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bool DecodeSoundDCT (ERISADecodeContext context, MioDataHeader datahdr, byte[] ptrWaveBuf, int wave_pos)
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{
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uint i, j, k;
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uint nDegreeWidth = 1u << m_mioih.SubbandDegree;
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uint nSampleCount = (datahdr.SampleCount + nDegreeWidth - 1) & ~(nDegreeWidth - 1);
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uint nSubbandCount = (nSampleCount >> m_mioih.SubbandDegree);
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uint nChannelCount = (uint)m_mioih.ChannelCount;
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uint nAllSampleCount = nSampleCount * nChannelCount;
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uint nAllSubbandCount = nSubbandCount * nChannelCount;
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if (nSampleCount > m_nBufLength)
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{
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m_ptrBuffer2 = new int[nAllSampleCount];
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m_ptrBuffer3 = new sbyte[nAllSampleCount * sizeof(short)];
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m_ptrDivisionTable = new byte[nAllSubbandCount];
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m_ptrWeightCode = new int[nAllSubbandCount * 5];
|
|
m_ptrCoefficient = new int[nAllSubbandCount * 5];
|
|
m_nBufLength = nSampleCount;
|
|
}
|
|
if (context.GetABit() != 0)
|
|
{
|
|
return false;
|
|
}
|
|
int[] pLastDivision = new int [nChannelCount];
|
|
m_ptrNextDivision = 0; // within m_ptrDivisionTable;
|
|
m_ptrNextWeight = 0; // within m_ptrWeightCode;
|
|
m_ptrNextCoefficient = 0; // within m_ptrCoefficient;
|
|
|
|
for (i = 0; i < nChannelCount; i++)
|
|
{
|
|
pLastDivision[i] = -1;
|
|
}
|
|
for (i = 0; i < nSubbandCount; i++)
|
|
{
|
|
for (j = 0; j < nChannelCount; j++)
|
|
{
|
|
int nDivisionCode = (int)context.GetNBits(2);
|
|
m_ptrDivisionTable[m_ptrNextDivision++] = (byte)nDivisionCode;
|
|
|
|
if (nDivisionCode != pLastDivision[j])
|
|
{
|
|
if (i != 0)
|
|
{
|
|
m_ptrWeightCode[m_ptrNextWeight++] = (int)context.GetNBits (32);
|
|
m_ptrCoefficient[m_ptrNextCoefficient++] = (int)context.GetNBits (16);
|
|
}
|
|
pLastDivision[j] = nDivisionCode;
|
|
}
|
|
|
|
uint nDivisionCount = 1u << nDivisionCode;
|
|
for (k = 0; k < nDivisionCount; k ++)
|
|
{
|
|
m_ptrWeightCode[m_ptrNextWeight++] = (int)context.GetNBits (32);
|
|
m_ptrCoefficient[m_ptrNextCoefficient++] = (int)context.GetNBits (16);
|
|
}
|
|
}
|
|
}
|
|
if (nSubbandCount > 0)
|
|
{
|
|
for (i = 0; i < nChannelCount; i++)
|
|
{
|
|
m_ptrWeightCode[m_ptrNextWeight++] = (int)context.GetNBits (32);
|
|
m_ptrCoefficient[m_ptrNextCoefficient++] = (int)context.GetNBits (16);
|
|
}
|
|
}
|
|
|
|
if (context.GetABit() != 0)
|
|
{
|
|
return false;
|
|
}
|
|
if (0 != (datahdr.Flags & MIO_LEAD_BLOCK))
|
|
{
|
|
if (m_mioih.Architecture != EriCode.Nemesis)
|
|
{
|
|
(context as HuffmanDecodeContext).PrepareToDecodeERINACode();
|
|
}
|
|
else
|
|
{
|
|
throw new NotImplementedException ("Nemesis encoding not implemented");
|
|
// context.PrepareToDecodeERISACode();
|
|
}
|
|
}
|
|
else if (m_mioih.Architecture == EriCode.Nemesis)
|
|
{
|
|
throw new NotImplementedException ("Nemesis encoding not implemented");
|
|
// context.InitializeERISACode();
|
|
}
|
|
if (m_mioih.Architecture != EriCode.Nemesis)
|
|
{
|
|
if (context.DecodeBytes (m_ptrBuffer3, nAllSampleCount * 2 ) < nAllSampleCount * 2)
|
|
{
|
|
return false;
|
|
}
|
|
int ptrHBuf = 0; // within m_ptrBuffer3;
|
|
int ptrLBuf = (int)nAllSampleCount; // within m_ptrBuffer3
|
|
|
|
for (i = 0; i < nDegreeWidth; i++)
|
|
{
|
|
int ptrQuantumized = (int)i; // within (PINT) m_ptrBuffer2
|
|
for (j = 0; j < nAllSubbandCount; j++)
|
|
{
|
|
int nLow = m_ptrBuffer3[ptrLBuf++];
|
|
int nHigh = m_ptrBuffer3[ptrHBuf++] ^ (nLow >> 8);
|
|
m_ptrBuffer2[ptrQuantumized] = (nLow & 0xFF) | (nHigh << 8);
|
|
ptrQuantumized += (int)nDegreeWidth;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
throw new NotImplementedException ("Nemesis encoding not implemented");
|
|
/*
|
|
if (context.DecodeERISACodeWords (m_ptrBuffer3, nAllSampleCount) < nAllSampleCount)
|
|
{
|
|
return false;
|
|
}
|
|
for (i = 0; i < nAllSampleCount; i++)
|
|
{
|
|
((PINT)m_ptrBuffer2)[i] = ((SWORD*)m_ptrBuffer3)[i];
|
|
}
|
|
*/
|
|
}
|
|
uint nSamples;
|
|
uint[] pRestSamples = new uint [nChannelCount];
|
|
int[] ptrDstBuf = new int [nChannelCount]; // indices within ptrWaveBuf
|
|
|
|
m_ptrNextDivision = 0; // within m_ptrDivisionTable;
|
|
m_ptrNextWeight = 0; // within m_ptrWeightCode;
|
|
m_ptrNextCoefficient = 0; // within m_ptrCoefficient;
|
|
m_ptrNextSource = 0; // within (PINT) m_ptrBuffer2;
|
|
|
|
for (i = 0; i < nChannelCount; i++)
|
|
{
|
|
pLastDivision[i] = -1;
|
|
pRestSamples[i] = datahdr.SampleCount;
|
|
ptrDstBuf[i] = wave_pos + (int)i*sizeof(short);
|
|
}
|
|
int nCurrentDivision = -1;
|
|
|
|
for (i = 0; i < nSubbandCount; i++)
|
|
{
|
|
for (j = 0; j < nChannelCount; j++)
|
|
{
|
|
int nDivisionCode = m_ptrDivisionTable[m_ptrNextDivision++];
|
|
int nDivisionCount = 1 << nDivisionCode;
|
|
int nChannelStep = (int)(nDegreeWidth * m_mioih.LappedDegree * j);
|
|
m_ptrLastDCTBuf = nChannelStep; // within m_ptrLastDCT
|
|
|
|
bool fLeadBlock = false;
|
|
if (pLastDivision[j] != nDivisionCode)
|
|
{
|
|
if (i != 0)
|
|
{
|
|
if (nCurrentDivision != pLastDivision[j])
|
|
{
|
|
InitializeWithDegree (m_mioih.SubbandDegree - pLastDivision[j]);
|
|
nCurrentDivision = pLastDivision[j];
|
|
}
|
|
nSamples = pRestSamples[j];
|
|
if (nSamples > m_nDegreeNum)
|
|
{
|
|
nSamples = m_nDegreeNum;
|
|
}
|
|
DecodePostBlock (ptrWaveBuf, ptrDstBuf[j], nSamples);
|
|
pRestSamples[j] -= nSamples;
|
|
ptrDstBuf[j] += (int)(nSamples * nChannelCount * sizeof(short));
|
|
}
|
|
pLastDivision[j] = (int)nDivisionCode;
|
|
fLeadBlock = true;
|
|
}
|
|
if (nCurrentDivision != nDivisionCode)
|
|
{
|
|
InitializeWithDegree (m_mioih.SubbandDegree - nDivisionCode);
|
|
nCurrentDivision = nDivisionCode;
|
|
}
|
|
for (k = 0; k < nDivisionCount; k++)
|
|
{
|
|
if (fLeadBlock)
|
|
{
|
|
DecodeLeadBlock();
|
|
fLeadBlock = false;
|
|
}
|
|
else
|
|
{
|
|
nSamples = pRestSamples[j];
|
|
if (nSamples > m_nDegreeNum)
|
|
{
|
|
nSamples = m_nDegreeNum;
|
|
}
|
|
DecodeInternalBlock (ptrWaveBuf, ptrDstBuf[j], nSamples);
|
|
pRestSamples[j] -= nSamples;
|
|
ptrDstBuf[j] += (int)(nSamples * nChannelCount * sizeof(short));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (nSubbandCount > 0)
|
|
{
|
|
for (i = 0; i < nChannelCount; i ++)
|
|
{
|
|
int nChannelStep = (int)(nDegreeWidth * m_mioih.LappedDegree * i);
|
|
m_ptrLastDCTBuf = nChannelStep; // within m_ptrLastDCT
|
|
|
|
if (nCurrentDivision != pLastDivision[i])
|
|
{
|
|
InitializeWithDegree (m_mioih.SubbandDegree - pLastDivision[i]);
|
|
nCurrentDivision = pLastDivision[i];
|
|
}
|
|
nSamples = pRestSamples[i];
|
|
if (nSamples > m_nDegreeNum)
|
|
{
|
|
nSamples = m_nDegreeNum;
|
|
}
|
|
DecodePostBlock (ptrWaveBuf, ptrDstBuf[i], nSamples);
|
|
pRestSamples[i] -= nSamples;
|
|
ptrDstBuf[i] += (int)(nSamples * nChannelCount * sizeof(short));
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void DecodeInternalBlock (byte[] ptrDst, int iDst, uint nSamples)
|
|
{
|
|
int nWeightCode = m_ptrWeightCode[m_ptrNextWeight++];
|
|
int nCoefficient = m_ptrCoefficient[m_ptrNextCoefficient++];
|
|
IQuantumize (m_ptrMatrixBuf, 0, m_ptrBuffer2, m_ptrNextSource, (int)m_nDegreeNum, nWeightCode, nCoefficient);
|
|
m_ptrNextSource += (int)m_nDegreeNum;
|
|
|
|
eriOddGivensInverseMatrix (m_ptrMatrixBuf, 0, m_pRevolveParam, m_nSubbandDegree);
|
|
eriFastIPLOT (m_ptrMatrixBuf, 0, m_nSubbandDegree);
|
|
eriFastILOT (m_ptrWorkBuf, m_ptrLastDCT, m_ptrLastDCTBuf, m_ptrMatrixBuf, m_nSubbandDegree);
|
|
|
|
for (uint i = 0; i < m_nDegreeNum; i++)
|
|
{
|
|
m_ptrLastDCT[m_ptrLastDCTBuf + i] = m_ptrMatrixBuf[i];
|
|
m_ptrMatrixBuf[i] = m_ptrWorkBuf[i];
|
|
}
|
|
eriFastIDCT (m_ptrInternalBuf, m_ptrMatrixBuf, 1, m_ptrWorkBuf, m_nSubbandDegree);
|
|
if (nSamples != 0)
|
|
{
|
|
eriRoundR32ToWordArray (ptrDst, iDst, m_mioih.ChannelCount, m_ptrInternalBuf, (int)nSamples);
|
|
}
|
|
}
|
|
|
|
void DecodeLeadBlock ()
|
|
{
|
|
int nWeightCode = m_ptrWeightCode[m_ptrNextWeight++];
|
|
int nCoefficient = m_ptrCoefficient[m_ptrNextCoefficient++];
|
|
uint i;
|
|
uint nHalfDegree = m_nDegreeNum / 2;
|
|
for (i = 0; i < nHalfDegree; i++)
|
|
{
|
|
m_ptrBuffer1[i * 2] = 0;
|
|
m_ptrBuffer1[i * 2 + 1] = m_ptrBuffer2[m_ptrNextSource++];
|
|
}
|
|
IQuantumize (m_ptrLastDCT, m_ptrLastDCTBuf, m_ptrBuffer1, 0, (int)m_nDegreeNum, nWeightCode, nCoefficient);
|
|
eriOddGivensInverseMatrix (m_ptrLastDCT, m_ptrLastDCTBuf, m_pRevolveParam, m_nSubbandDegree);
|
|
for (i = 0; i < m_nDegreeNum; i += 2)
|
|
{
|
|
m_ptrLastDCT[m_ptrLastDCTBuf + i] = m_ptrLastDCT[m_ptrLastDCTBuf + i + 1];
|
|
}
|
|
eriFastIPLOT (m_ptrLastDCT, m_ptrLastDCTBuf, m_nSubbandDegree);
|
|
}
|
|
|
|
void DecodePostBlock (byte[] ptrDst, int iDst, uint nSamples)
|
|
{
|
|
int nWeightCode = m_ptrWeightCode[m_ptrNextWeight++];
|
|
int nCoefficient = m_ptrCoefficient[m_ptrNextCoefficient++];
|
|
uint i;
|
|
uint nHalfDegree = m_nDegreeNum / 2;
|
|
for (i = 0; i < nHalfDegree; i++)
|
|
{
|
|
m_ptrBuffer1[i * 2] = 0;
|
|
m_ptrBuffer1[i * 2 + 1] = m_ptrBuffer2[m_ptrNextSource++];
|
|
}
|
|
IQuantumize (m_ptrMatrixBuf, 0, m_ptrBuffer1, 0, (int)m_nDegreeNum, nWeightCode, nCoefficient);
|
|
eriOddGivensInverseMatrix (m_ptrMatrixBuf, 0, m_pRevolveParam, m_nSubbandDegree);
|
|
|
|
for (i = 0; i < m_nDegreeNum; i += 2)
|
|
{
|
|
m_ptrMatrixBuf[i] = - m_ptrMatrixBuf[i + 1];
|
|
}
|
|
|
|
eriFastIPLOT (m_ptrMatrixBuf, 0, m_nSubbandDegree);
|
|
eriFastILOT (m_ptrWorkBuf, m_ptrLastDCT, m_ptrLastDCTBuf, m_ptrMatrixBuf, m_nSubbandDegree);
|
|
|
|
for (i = 0; i < m_nDegreeNum; i++)
|
|
{
|
|
m_ptrMatrixBuf[i] = m_ptrWorkBuf[i];
|
|
}
|
|
eriFastIDCT (m_ptrInternalBuf, m_ptrMatrixBuf, 1, m_ptrWorkBuf, m_nSubbandDegree);
|
|
if (nSamples != 0)
|
|
{
|
|
eriRoundR32ToWordArray (ptrDst, iDst, m_mioih.ChannelCount, m_ptrInternalBuf, (int)nSamples);
|
|
}
|
|
}
|
|
|
|
void IQuantumize (float[] ptrDestination, int dst, int[] ptrQuantumized, int qsrc, int nDegreeNum, int nWeightCode, int nCoefficient)
|
|
{
|
|
int i, j;
|
|
double rMatrixScale = Math.Sqrt (2.0 / nDegreeNum);
|
|
double rCoefficient = rMatrixScale * nCoefficient;
|
|
double[] rAvgRatio = new double[7];
|
|
for (i = 0; i < 6; i++)
|
|
{
|
|
rAvgRatio[i] = 1.0 / Math.Pow (2.0, (((nWeightCode >> (i * 5)) & 0x1F) - 15) * 0.5);
|
|
}
|
|
rAvgRatio[6] = 1.0;
|
|
for (i = 0; i < m_nFrequencyPoint[0]; i++)
|
|
{
|
|
m_ptrWeightTable[i] = (float) rAvgRatio[0];
|
|
}
|
|
for (j = 1; j < 7; j++)
|
|
{
|
|
double a = rAvgRatio[j - 1];
|
|
double k = (rAvgRatio[j] - a) / (m_nFrequencyPoint[j] - m_nFrequencyPoint[j - 1]);
|
|
while (i < m_nFrequencyPoint[j])
|
|
{
|
|
m_ptrWeightTable[i] = (float)(k * (i - m_nFrequencyPoint[j - 1]) + a);
|
|
i++;
|
|
}
|
|
}
|
|
while (i < nDegreeNum)
|
|
{
|
|
m_ptrWeightTable[i++] = (float)rAvgRatio[6];
|
|
}
|
|
float rOddWeight = (float)((((nWeightCode >> 30) & 0x03) + 0x02) / 2.0);
|
|
for (i = 15; i < nDegreeNum; i += 16)
|
|
{
|
|
m_ptrWeightTable[i] *= rOddWeight;
|
|
}
|
|
m_ptrWeightTable[nDegreeNum-1] = (float) nCoefficient;
|
|
for (i = 0; i < nDegreeNum; i++)
|
|
{
|
|
m_ptrWeightTable[i] = 1.0F / m_ptrWeightTable[i];
|
|
}
|
|
for (i = 0; i < nDegreeNum; i ++)
|
|
{
|
|
ptrDestination[dst + i] = (float) (rCoefficient * m_ptrWeightTable[i] * ptrQuantumized[qsrc+i]);
|
|
}
|
|
}
|
|
|
|
bool DecodeSoundDCT_MSS (ERISADecodeContext context, MioDataHeader datahdr, byte[] ptrWaveBuf, int wave_pos)
|
|
{
|
|
throw new NotImplementedException ("MioDecoder.DecodeSoundDCT_MSS not implemented");
|
|
}
|
|
|
|
bool DecodeInternalBlock_MSS (byte[] ptrDst, int iDst, uint nSamples)
|
|
{
|
|
throw new NotImplementedException ("MioDecoder.DecodeInternalBlock_MSS not implemented");
|
|
}
|
|
|
|
bool DecodeLeadBlock_MSS ()
|
|
{
|
|
throw new NotImplementedException ("MioDecoder.DecodeLeadBlock_MSS not implemented");
|
|
}
|
|
|
|
bool DecodePostBlock_MSS (byte[] ptrDst, int iDst, uint nSamples)
|
|
{
|
|
throw new NotImplementedException ("MioDecoder.DecodePostBlock_MSS not implemented");
|
|
}
|
|
|
|
static readonly float ERI_rCosPI4 = (float)Math.Cos (Math.PI / 4);
|
|
static readonly float ERI_r2CosPI4 = 2 * ERI_rCosPI4;
|
|
static readonly float[] ERI_DCTofK2 = new float[2]; // = cos ((2*i+1) / 8)
|
|
static readonly float[] ERI_DCTofK4 = new float[4]; // = cos( (2*i+1) / 16 )
|
|
static readonly float[] ERI_DCTofK8 = new float[8]; // = cos( (2*i+1) / 32 )
|
|
static readonly float[] ERI_DCTofK16 = new float[16]; // = cos( (2*i+1) / 64 )
|
|
static readonly float[] ERI_DCTofK32 = new float[32]; // = cos( (2*i+1) / 128 )
|
|
static readonly float[] ERI_DCTofK64 = new float[64]; // = cos( (2*i+1) / 256 )
|
|
static readonly float[] ERI_DCTofK128 = new float[128]; // = cos( (2*i+1) / 512 )
|
|
static readonly float[] ERI_DCTofK256 = new float[256]; // = cos( (2*i+1) / 1024 )
|
|
static readonly float[] ERI_DCTofK512 = new float[512]; // = cos( (2*i+1) / 2048 )
|
|
static readonly float[] ERI_DCTofK1024 = new float[1024]; // = cos( (2*i+1) / 4096 )
|
|
static readonly float[] ERI_DCTofK2048 = new float[2048]; // = cos( (2*i+1) / 8192 )
|
|
|
|
static readonly float[][] ERI_pMatrixDCTofK = new float[MAX_DCT_DEGREE][]
|
|
{
|
|
null,
|
|
ERI_DCTofK2,
|
|
ERI_DCTofK4,
|
|
ERI_DCTofK8,
|
|
ERI_DCTofK16,
|
|
ERI_DCTofK32,
|
|
ERI_DCTofK64,
|
|
ERI_DCTofK128,
|
|
ERI_DCTofK256,
|
|
ERI_DCTofK512,
|
|
ERI_DCTofK1024,
|
|
ERI_DCTofK2048
|
|
};
|
|
|
|
static void eriInitializeMatrix ()
|
|
{
|
|
for (int i = 1; i < MAX_DCT_DEGREE; i++)
|
|
{
|
|
int n = (1 << i);
|
|
float[] pDCTofK = ERI_pMatrixDCTofK[i];
|
|
double nr = Math.PI / (4.0 * n);
|
|
double dr = nr + nr;
|
|
double ir = nr;
|
|
for (int j = 0; j < n; j++)
|
|
{
|
|
pDCTofK[j] = (float)Math.Cos (ir);
|
|
ir += dr;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void eriRoundR32ToWordArray (byte[] ptrDst, int dst, int nStep, float[] ptrSrc, int nCount)
|
|
{
|
|
for (int i = 0; i < nCount; i++)
|
|
{
|
|
int nValue = eriRoundR32ToInt (ptrSrc[i]);
|
|
if (nValue <= -0x8000)
|
|
{
|
|
LittleEndian.Pack ((short)-0x8000, ptrDst, dst);
|
|
}
|
|
else if (nValue >= 0x7FFF)
|
|
{
|
|
LittleEndian.Pack ((short)0x7FFF, ptrDst, dst);
|
|
}
|
|
else
|
|
{
|
|
LittleEndian.Pack ((short)nValue, ptrDst, dst);
|
|
}
|
|
dst += nStep*2;
|
|
}
|
|
}
|
|
|
|
static int eriRoundR32ToInt (float r)
|
|
{
|
|
if (r >= 0.0)
|
|
return (int)Math.Floor (r + 0.5);
|
|
else
|
|
return (int)Math.Ceiling (r - 0.5);
|
|
}
|
|
|
|
static EriSinCos[] eriCreateRevolveParameter (int nDegreeDCT)
|
|
{
|
|
int nDegreeNum = 1 << nDegreeDCT;
|
|
int lc = 1;
|
|
for (int n = nDegreeNum / 2; n >= 8; n /= 8)
|
|
{
|
|
++lc;
|
|
}
|
|
EriSinCos[] ptrRevolve = new EriSinCos[lc*8];
|
|
|
|
double k = Math.PI / (nDegreeNum * 2);
|
|
int ptrNextRev = 0;
|
|
int nStep = 2;
|
|
do
|
|
{
|
|
for (int i = 0; i < 7; i++)
|
|
{
|
|
double ws = 1.0;
|
|
double a = 0.0;
|
|
for (int j = 0; j < i; j++)
|
|
{
|
|
a += nStep;
|
|
ws = ws * ptrRevolve[ptrNextRev+j].rSin + ptrRevolve[ptrNextRev+j].rCos * Math.Cos (a * k);
|
|
}
|
|
double r = Math.Atan2 (ws, Math.Cos ((a + nStep) * k));
|
|
ptrRevolve[ptrNextRev+i].rSin = (float)Math.Sin (r);
|
|
ptrRevolve[ptrNextRev+i].rCos = (float)Math.Cos (r);
|
|
}
|
|
ptrNextRev += 7;
|
|
nStep *= 8;
|
|
}
|
|
while (nStep < nDegreeNum);
|
|
return ptrRevolve;
|
|
}
|
|
|
|
static void eriOddGivensInverseMatrix (float[] ptrSrc, int src, EriSinCos[] ptrRevolve, int nDegreeDCT)
|
|
{
|
|
int nDegreeNum = 1 << nDegreeDCT;
|
|
int index = 1;
|
|
int nStep = 2;
|
|
int lc = (nDegreeNum / 2) / 8;
|
|
int resolve_idx = 0;
|
|
for (;;)
|
|
{
|
|
resolve_idx += 7;
|
|
index += nStep * 7;
|
|
nStep *= 8;
|
|
if (lc <= 8)
|
|
break;
|
|
lc /= 8;
|
|
}
|
|
int k = index + nStep * (lc - 2);
|
|
int j;
|
|
float r1, r2;
|
|
for (j = lc - 2; j >= 0; j--)
|
|
{
|
|
r1 = ptrSrc[src + k];
|
|
r2 = ptrSrc[src + k + nStep];
|
|
ptrSrc[src + k] = r1 * ptrRevolve[resolve_idx+j].rCos + r2 * ptrRevolve[resolve_idx+j].rSin;
|
|
ptrSrc[src + k + nStep] = r2 * ptrRevolve[resolve_idx+j].rCos - r1 * ptrRevolve[resolve_idx+j].rSin;
|
|
k -= nStep;
|
|
}
|
|
for (; lc <= (nDegreeNum / 2) / 8; lc *= 8)
|
|
{
|
|
resolve_idx -= 7;
|
|
nStep /= 8;
|
|
index -= nStep * 7;
|
|
for (int i = 0; i < lc; i++)
|
|
{
|
|
k = i * (nStep * 8) + index + nStep * 6;
|
|
for ( j = 6; j >= 0; j -- )
|
|
{
|
|
r1 = ptrSrc[src + k];
|
|
r2 = ptrSrc[src + k + nStep];
|
|
ptrSrc[src + k] =
|
|
r1 * ptrRevolve[resolve_idx+j].rCos + r2 * ptrRevolve[resolve_idx+j].rSin;
|
|
ptrSrc[src + k + nStep] =
|
|
r2 * ptrRevolve[resolve_idx+j].rCos - r1 * ptrRevolve[resolve_idx+j].rSin;
|
|
k -= nStep;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void eriFastIPLOT (float[] ptrSrc, int src, int nDegreeDCT)
|
|
{
|
|
int nDegreeNum = 1 << nDegreeDCT;
|
|
for (int i = 0; i < nDegreeNum; i += 2)
|
|
{
|
|
float r1 = ptrSrc[src + i];
|
|
float r2 = ptrSrc[src + i + 1];
|
|
ptrSrc[src + i] = 0.5f * (r1 + r2);
|
|
ptrSrc[src + i + 1] = 0.5f * (r1 - r2);
|
|
}
|
|
}
|
|
|
|
static void eriFastILOT (float[] ptrDst, float[] ptrSrc1, int src1, float[] ptrSrc2, int nDegreeDCT)
|
|
{
|
|
int nDegreeNum = 1 << nDegreeDCT;
|
|
for (int i = 0; i < nDegreeNum; i += 2)
|
|
{
|
|
float r1 = ptrSrc1[src1 + i];
|
|
float r2 = ptrSrc2[i + 1];
|
|
ptrDst[i] = r1 + r2;
|
|
ptrDst[i + 1] = r1 - r2;
|
|
}
|
|
}
|
|
|
|
static void eriFastDCT (float[] ptrDst, int dst, int nDstInterval, float[] ptrSrc, int src, float[] ptrWorkBuf, int work, int nDegreeDCT)
|
|
{
|
|
Debug.Assert ((nDegreeDCT >= MIN_DCT_DEGREE) && (nDegreeDCT <= MAX_DCT_DEGREE));
|
|
|
|
if (nDegreeDCT == MIN_DCT_DEGREE)
|
|
{
|
|
float[] r32Buf = new float[4];
|
|
r32Buf[0] = ptrSrc[src] + ptrSrc[src+3];
|
|
r32Buf[2] = ptrSrc[src] - ptrSrc[src+3];
|
|
r32Buf[1] = ptrSrc[src+1] + ptrSrc[src+2];
|
|
r32Buf[3] = ptrSrc[src+1] - ptrSrc[src+2];
|
|
|
|
ptrDst[dst] = 0.5f * (r32Buf[0] + r32Buf[1]);
|
|
ptrDst[dst+nDstInterval * 2] = ERI_rCosPI4 * (r32Buf[0] - r32Buf[1]);
|
|
|
|
r32Buf[2] = ERI_DCTofK2[0] * r32Buf[2];
|
|
r32Buf[3] = ERI_DCTofK2[1] * r32Buf[3];
|
|
|
|
r32Buf[0] = r32Buf[2] + r32Buf[3];
|
|
r32Buf[1] = ERI_r2CosPI4 * (r32Buf[2] - r32Buf[3]);
|
|
|
|
r32Buf[1] -= r32Buf[0];
|
|
|
|
ptrDst[dst+nDstInterval] = r32Buf[0];
|
|
ptrDst[dst+nDstInterval * 3] = r32Buf[1];
|
|
}
|
|
else
|
|
{
|
|
uint i;
|
|
uint nDegreeNum = 1u << nDegreeDCT;
|
|
uint nHalfDegree = nDegreeNum >> 1;
|
|
for (i = 0; i < nHalfDegree; i++)
|
|
{
|
|
ptrWorkBuf[work+i] = ptrSrc[src+i] + ptrSrc[src + nDegreeNum - i - 1];
|
|
ptrWorkBuf[work+i + nHalfDegree] = ptrSrc[src+i] - ptrSrc[src + nDegreeNum - i - 1];
|
|
}
|
|
int nDstStep = nDstInterval << 1;
|
|
eriFastDCT (ptrDst, dst, nDstStep, ptrWorkBuf, work, ptrSrc, src, nDegreeDCT - 1);
|
|
|
|
float[] pDCTofK = ERI_pMatrixDCTofK[nDegreeDCT - 1];
|
|
src = (int)(work+nHalfDegree); // ptrSrc = ptrWorkBuf + nHalfDegree;
|
|
dst += nDstInterval; // ptrDst += nDstInterval;
|
|
|
|
for (i = 0; i < nHalfDegree; i++)
|
|
{
|
|
ptrWorkBuf[src + i] *= pDCTofK[i];
|
|
}
|
|
|
|
eriFastDCT (ptrDst, dst, nDstStep, ptrWorkBuf, src, ptrWorkBuf, work, nDegreeDCT - 1);
|
|
// eriFastDCT (ptrDst, nDstStep, ptrSrc, ptrWorkBuf, nDegreeDCT - 1);
|
|
|
|
int ptrNext = dst; // within ptrDst;
|
|
for (i = 0; i < nHalfDegree; i++)
|
|
{
|
|
ptrDst[ptrNext] += ptrDst[ptrNext]; // *ptrNext += *ptrNext;
|
|
ptrNext += nDstStep;
|
|
}
|
|
ptrNext = dst;
|
|
for (i = 1; i < nHalfDegree; i ++)
|
|
{
|
|
ptrDst[ptrNext + nDstStep] -= ptrDst[ptrNext];
|
|
ptrNext += nDstStep;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void eriFastIDCT (float[] ptrDst, float[] ptrSrc, int nSrcInterval, float[] ptrWorkBuf, int nDegreeDCT)
|
|
{
|
|
Debug.Assert ((nDegreeDCT >= MIN_DCT_DEGREE) && (nDegreeDCT <= MAX_DCT_DEGREE));
|
|
|
|
if (nDegreeDCT == MIN_DCT_DEGREE)
|
|
{
|
|
float[] r32Buf1 = new float[2];
|
|
float[] r32Buf2 = new float[4];
|
|
|
|
r32Buf1[0] = ptrSrc[0];
|
|
r32Buf1[1] = ERI_rCosPI4 * ptrSrc[nSrcInterval * 2];
|
|
|
|
r32Buf2[0] = r32Buf1[0] + r32Buf1[1];
|
|
r32Buf2[1] = r32Buf1[0] - r32Buf1[1];
|
|
|
|
r32Buf1[0] = ERI_DCTofK2[0] * ptrSrc[nSrcInterval];
|
|
r32Buf1[1] = ERI_DCTofK2[1] * ptrSrc[nSrcInterval * 3];
|
|
|
|
r32Buf2[2] = r32Buf1[0] + r32Buf1[1];
|
|
r32Buf2[3] = ERI_r2CosPI4 * (r32Buf1[0] - r32Buf1[1]);
|
|
|
|
r32Buf2[3] -= r32Buf2[2];
|
|
|
|
ptrDst[0] = r32Buf2[0] + r32Buf2[2];
|
|
ptrDst[3] = r32Buf2[0] - r32Buf2[2];
|
|
ptrDst[1] = r32Buf2[1] + r32Buf2[3];
|
|
ptrDst[2] = r32Buf2[1] - r32Buf2[3];
|
|
}
|
|
else
|
|
{
|
|
uint i;
|
|
uint nDegreeNum = 1u << nDegreeDCT;
|
|
uint nHalfDegree = nDegreeNum >> 1;
|
|
int nSrcStep = nSrcInterval << 1;
|
|
eriFastIDCT (ptrDst, ptrSrc, nSrcStep, ptrWorkBuf, nDegreeDCT - 1);
|
|
|
|
float[] pDCTofK = ERI_pMatrixDCTofK[nDegreeDCT - 1];
|
|
int pOddSrc = nSrcInterval; // within ptrSrc
|
|
int pOddDst = (int)nHalfDegree; // within ptrDst
|
|
|
|
int ptrNext = pOddSrc;
|
|
for (i = 0; i < nHalfDegree; i++)
|
|
{
|
|
ptrWorkBuf[i] = ptrSrc[ptrNext] * pDCTofK[i];
|
|
ptrNext += nSrcStep;
|
|
}
|
|
|
|
eriFastDCT (ptrDst, pOddDst, 1, ptrWorkBuf, 0, ptrWorkBuf, (int)nHalfDegree, nDegreeDCT - 1);
|
|
// eriFastDCT(pOddDst, 1, ptrWorkBuf, (ptrWorkBuf + nHalfDegree), nDegreeDCT - 1);
|
|
|
|
for (i = 0; i < nHalfDegree; i ++)
|
|
{
|
|
ptrDst[pOddDst + i] += ptrDst[pOddDst + i];
|
|
}
|
|
|
|
for (i = 1; i < nHalfDegree; i++)
|
|
{
|
|
ptrDst[pOddDst + i] -= ptrDst[pOddDst + i - 1];
|
|
}
|
|
float[] r32Buf = new float[4];
|
|
uint nQuadDegree = nHalfDegree >> 1;
|
|
for (i = 0; i < nQuadDegree; i++)
|
|
{
|
|
r32Buf[0] = ptrDst[i] + ptrDst[nHalfDegree + i];
|
|
r32Buf[3] = ptrDst[i] - ptrDst[nHalfDegree + i];
|
|
r32Buf[1] = ptrDst[nHalfDegree - 1 - i] + ptrDst[nDegreeNum - 1 - i];
|
|
r32Buf[2] = ptrDst[nHalfDegree - 1 - i] - ptrDst[nDegreeNum - 1 - i];
|
|
|
|
ptrDst[i] = r32Buf[0];
|
|
ptrDst[nHalfDegree - 1 - i] = r32Buf[1];
|
|
ptrDst[nHalfDegree + i] = r32Buf[2];
|
|
ptrDst[nDegreeNum - 1 - i] = r32Buf[3];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|