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272 lines
10 KiB
C#
272 lines
10 KiB
C#
//! \file AudioADX.cs
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//! \date Wed Mar 09 11:21:57 2016
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//! \brief CRI MiddleWare ADPCM audio.
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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 System.Threading;
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using GameRes.Utility;
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namespace GameRes.Formats.Cri
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{
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[Export(typeof(AudioFormat))]
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public class AdxAudio : AudioFormat
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{
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public override string Tag { get { return "ADX"; } }
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public override string Description { get { return "CRI MiddleWare ADPCM audio"; } }
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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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uint signature = FormatCatalog.ReadSignature (file);
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if (0x80 != (signature & 0xFFFF))
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return null;
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uint header_size = Binary.BigEndian (signature & 0xFFFF0000);
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if (header_size < 0x10 || header_size >= file.Length)
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return null;
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var header = new byte[header_size];
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if (header.Length != file.Read (header, 0, header.Length))
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return null;
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if (!Binary.AsciiEqual (header, header.Length-6, "(c)CRI"))
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return null;
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return new AdxInput (file, header);
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}
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}
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internal class AdxInput : SoundInput
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{
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AdxReader m_reader;
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int m_data_offset;
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int m_bitrate;
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long m_position;
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int m_buffered_sample;
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int m_buffered_count;
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int m_bytes_per_frame;
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ThreadLocal<short[]> m_frame_buffer;
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public override string SourceFormat { get { return "adx"; } }
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public override int SourceBitrate { get { return m_bitrate; } }
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public AdxInput (Stream file, byte[] header) : base (file)
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{
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m_reader = new AdxReader (file, header);
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m_data_offset = 4 + header.Length;
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this.Format = m_reader.Format;
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this.PcmSize = m_reader.SampleCount * Format.BlockAlign;
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m_bitrate = (int)(Format.SamplesPerSecond * (file.Length-m_data_offset) * 8 / m_reader.SampleCount);
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int frame_buffer_length = m_reader.SamplesPerFrame * m_reader.Format.Channels;
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m_frame_buffer = new ThreadLocal<short[]> (() => new short[frame_buffer_length]);
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m_bytes_per_frame = frame_buffer_length * Format.BitsPerSample / 8;
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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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int total_read = 0;
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int current_sample = (int)(m_position / Format.BlockAlign);
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bool need_refill = !(current_sample >= m_buffered_sample && current_sample < m_buffered_sample + m_buffered_count);
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int src_offset = (int)(m_position % m_bytes_per_frame);
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while (count > 0 && m_position < PcmSize)
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{
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if (need_refill)
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FillBuffer();
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int available = Math.Min (count, m_buffered_count * Format.BlockAlign - src_offset);
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Buffer.BlockCopy (m_frame_buffer.Value, src_offset, buffer, offset, available);
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offset += available;
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count -= available;
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total_read += available;
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m_position += available;
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src_offset = 0;
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need_refill = true;
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}
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return total_read;
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}
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void FillBuffer ()
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{
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int frame_number = (int)(m_position / m_bytes_per_frame);
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m_reader.SetPosition (m_data_offset + frame_number * m_reader.FrameSize * Format.Channels);
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for (int i = 0; i < Format.Channels; ++i)
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{
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m_reader.DecodeFrame (i, m_frame_buffer.Value);
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}
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m_buffered_sample = frame_number * m_reader.SamplesPerFrame;
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m_buffered_count = Math.Min (m_reader.SampleCount - m_buffered_sample, m_reader.SamplesPerFrame);
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}
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// FIXME
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// such implementation of seek is broken since it doesn't take into account ADPCM decoder 'history',
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// therefore CanSeek returns false.
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public override bool CanSeek { get { return false; } }
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public override long Position
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{
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get { return m_position; }
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set { m_position = Math.Max (value, 0); }
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}
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#region IDisposable Members
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bool _adx_disposed = false;
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protected override void Dispose (bool disposing)
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{
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if (!_adx_disposed)
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{
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if (disposing)
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{
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m_reader.Dispose();
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m_frame_buffer.Dispose();
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}
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_adx_disposed = true;
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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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internal sealed class AdxReader : IDisposable
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{
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MsbBitStream m_input;
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WaveFormat m_format;
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int m_samples_per_frame;
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int m_prev_scale0;
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int m_prev_scale1;
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int[][] m_prev_samples;
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public WaveFormat Format { get { return m_format; } }
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public int SamplesPerFrame { get { return m_samples_per_frame; } }
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public int SampleCount { get; private set; }
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public int FrameSize { get; private set; }
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public int BitsPerSample { get; private set; }
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public AdxReader (Stream file, byte[] header)
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{
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FrameSize = header[1];
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BitsPerSample = header[2];
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if (header[0] != 3 || FrameSize != 0x12 || BitsPerSample != 4)
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throw new InvalidFormatException();
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m_samples_per_frame = (FrameSize - 2) * 8 / BitsPerSample;
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m_format.Channels = header[3];
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if (0 == m_format.Channels || m_format.Channels > 16)
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throw new InvalidFormatException();
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int encoding = BigEndian.ToInt16 (header, 0x0E);
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if (encoding != 0x0400)
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throw new NotSupportedException ("Not supported ADX encoding");
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m_format.FormatTag = 1;
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m_format.SamplesPerSecond = BigEndian.ToUInt32 (header, 4);
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m_format.BitsPerSample = 16;
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m_format.BlockAlign = (ushort)(m_format.BitsPerSample * m_format.Channels / 8);
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m_format.AverageBytesPerSecond = m_format.SamplesPerSecond * m_format.BlockAlign;
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SampleCount = BigEndian.ToInt32 (header, 8);
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int lowest_freq = BigEndian.ToUInt16 (header, 12);
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var sqrt2 = Math.Sqrt (2.0);
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var x = sqrt2 - Math.Cos (2 * Math.PI * lowest_freq / m_format.SamplesPerSecond);
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var y = sqrt2 - 1;
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var z = (x - Math.Sqrt ((x + y) * (x - y))) / y;
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m_prev_scale0 = (int)Math.Floor (z * 8192);
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m_prev_scale1 = (int)Math.Floor (z * z * -4096);
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m_prev_samples = new int[m_format.Channels][];
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for (int i = 0; i < m_format.Channels; ++i)
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{
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m_prev_samples[i] = new int[2];
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}
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file.Position = 4+header.Length;
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m_input = new MsbBitStream (file, true);
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}
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/*
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public void Decode (Stream output)
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{
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int block_align = (int)m_format.BlockAlign;
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var frame = new short[m_samples_per_frame * Format.Channels];
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int sample = 0;
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while (sample < SampleCount)
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{
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int channel_offset = 0;
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for (int i = 0; i < m_format.Channels; ++i)
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{
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DecodeFrame (i, frame);
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}
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int samples_in_frame = Math.Min (SampleCount - sample, m_samples_per_frame);
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output.Write (frame, 0, samples_in_frame * block_align); // XXX convert to byte array
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sample += samples_in_frame;
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}
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}
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*/
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public void SetPosition (long position)
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{
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m_input.Input.Position = position;
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m_input.Reset();
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}
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public void DecodeFrame (int channel, short[] output)
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{
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int offset = channel;
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var prev_samples = m_prev_samples[channel];
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int scale = (short)m_input.GetBits (16) + 1;
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for (int i = 0; i < m_samples_per_frame; ++i)
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{
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int sample = NibbleToSigned (m_input.GetBits (BitsPerSample));
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int adjust = (m_prev_scale0 * prev_samples[0] + m_prev_scale1 * prev_samples[1]) >> 12;
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sample = Clamp16 (sample * scale + adjust);
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output[offset] = (short)sample;
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offset += m_format.Channels;
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prev_samples[1] = prev_samples[0];
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prev_samples[0] = sample;
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}
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}
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static int NibbleToSigned (int n)
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{
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return (n & 7) - (n & 8);
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}
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static int Clamp16 (int sample)
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{
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if (sample > 0x7FFF)
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sample = 0x7FFF;
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else if (sample < -0x8000)
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sample = -0x8000;
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return sample;
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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_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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