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- using System.Runtime.InteropServices;
- using System.Text;
- using Bmp.Core.Common.Utility;
- using NAudio.Wave;
- using WaveFormat = NAudio.Wave.WaveFormat;
- namespace Bmp.Core.Lite.Playback.Inputs;
- public class DffAudioStream : DsdAudioStream,IHaveDecoderInfo
- {
- private const string ID_FRM8 = "FRM8";
- private const string ID_DSD = "DSD ";
- private const string ID_SND = "SND ";
- private const string ID_FS = "FS ";
- private const string ID_CHNL = "CHNL";
- private const string ID_CMPR = "CMPR";
- private const string ID_DST = "DST ";
- private const string ID_LSCO = "LSCO";
- private const string ID_PROP = "PROP";
- private const string ID_DIIN = "DIIN";
- private const string ID_MARK = "MARK";
- private const int FILE_VERSION = 0x01050000;
- string IHaveDecoderInfo.DecoderName => "DFF";
- string? IHaveDecoderInfo.FileFormat => "V1.5";
- public static bool IsDffFile(Stream stream)
- {
- if (stream.Length > 4)
- {
- using var binaryReader = new BinaryReader(stream, Encoding.UTF8, true);
- var signatureDSD = Encoding.ASCII.GetString(binaryReader.ReadBytes(4));
- if (signatureDSD == ID_FRM8) return true;
- }
- return false;
- }
- [StructLayout(LayoutKind.Sequential, Pack = 1, CharSet = CharSet.Ansi)]
- public struct ID
- {
- [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 4)]
- public string Value;
- }
- [StructLayout(LayoutKind.Sequential, Pack = 1, CharSet = CharSet.Ansi)]
- public struct Chunk
- {
- [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 4)]
- public string Id;
- private readonly long chunkDataSize;
- public long DataSize => chunkDataSize.NetworkOrderToHostOrder();
- }
- private readonly Stream _underlyingStream;
- private readonly bool _disposeStream;
- private readonly int _fileVersion;
- private readonly int _sampleRate;
- private readonly short _channelCount;
- private readonly IReadOnlyCollection<string> _channelIds;
- private readonly bool _isDstEncoded;
- private readonly short _loudspeakerConfig;
- private readonly long _dataOffset;
- private readonly long _dataSize;
-
- public DffAudioStream(string urlOrPath) : this(InputSourceProviderLite.ReadContentAsSeekableStream(urlOrPath), true)
- {
- }
- public DffAudioStream(Stream underlyingStream, bool disposeStream)
- {
- _underlyingStream = underlyingStream;
- _disposeStream = disposeStream;
- var ck = new Chunk();
- var sizeOfCk = Marshal.SizeOf<Chunk>();
- var sizeOfId = Marshal.SizeOf<ID>();
- if (underlyingStream.Length < sizeOfCk) throw new InvalidDataException("too small as dff file");
- underlyingStream.ReadStruct(ref ck);
- if (ck.Id != ID_FRM8) throw new InvalidDataException("invalid FRM8 signature");
- var frm8Size = ck.DataSize;
- var id = underlyingStream.ReadStruct<ID>();
- if (id.Value != ID_DSD) throw new InvalidDataException("invalid DSD signature");
- while (_underlyingStream.Position < (frm8Size + sizeOfCk))
- {
- underlyingStream.ReadStruct(ref ck);
- switch ((ck.Id, ck.DataSize))
- {
- case ("FVER", 4):
- _fileVersion = _underlyingStream.ReadStruct<int>().NetworkOrderToHostOrder();
- if (_fileVersion != FILE_VERSION) throw new InvalidDataException("invalid File version");
- continue;
- default:
- switch (ck.Id)
- {
- case ID_PROP:
- underlyingStream.ReadStruct(ref id);
- if (id.Value != ID_SND) throw new InvalidDataException("invalid SND signature");
- var id_prop_end = _underlyingStream.Position - sizeOfId + ck.DataSize;
- while (_underlyingStream.Position < id_prop_end)
- {
- underlyingStream.ReadStruct(ref ck);
- switch (ck.Id, ck.DataSize)
- {
- case (ID_FS, 4):
- _sampleRate = _underlyingStream.ReadStruct<int>().NetworkOrderToHostOrder();
- break;
- case (ID_LSCO, 2):
- _loudspeakerConfig = _underlyingStream.ReadStruct<short>().NetworkOrderToHostOrder();
- break;
- default:
- switch (ck.Id)
- {
- case ID_CHNL:
- _channelCount = _underlyingStream.ReadStruct<short>().NetworkOrderToHostOrder();
- _channelIds = Enumerable.Range(0, _channelCount).Select(_ => _underlyingStream.ReadStruct<ID>().Value).ToArray();
- break;
- case ID_CMPR:
- var compressionId = _underlyingStream.ReadStruct<ID>().Value;
- _isDstEncoded = compressionId == ID_DST;
- var len = _underlyingStream.ReadStruct<byte>();
- var text = Encoding.UTF8.GetString(_underlyingStream.ReadBytes(len));
- break;
- default:
- //skip unknown chunk
- _underlyingStream.Seek(ck.DataSize, SeekOrigin.Current);
- break;
- }
- break;
- }
- //align: pad byte char with value 0, used for making chunks an even length.
- _underlyingStream.Seek(_underlyingStream.Position % 2, SeekOrigin.Current);
- }
- break; //case ID_PROP:
- case ID_DIIN:
- var id_diin_end = _underlyingStream.Position - sizeOfId + ck.DataSize;
- while (_underlyingStream.Position < id_diin_end)
- {
- underlyingStream.ReadStruct(ref ck);
- switch (ck.Id)
- {
- case ID_MARK:
- var hours = _underlyingStream.ReadStruct<short>().NetworkOrderToHostOrder();
- var minutes = _underlyingStream.ReadStruct<byte>();
- var second = _underlyingStream.ReadStruct<byte>();
- var samples = _underlyingStream.ReadStruct<uint>().NetworkOrderToHostOrder();
- var offset = _underlyingStream.ReadStruct<int>().NetworkOrderToHostOrder();
- // 0 TrackStart
- // 1 TrackStop
- // 2 ProgramStart
- // 4 Index Entry point of an Index
- var type = _underlyingStream.ReadStruct<short>().NetworkOrderToHostOrder();
- // 0 All channels
- var channel = _underlyingStream.ReadStruct<short>().NetworkOrderToHostOrder();
- var trackFlags = _underlyingStream.ReadStruct<short>().NetworkOrderToHostOrder();
- var textLen = _underlyingStream.ReadStruct<int>().NetworkOrderToHostOrder();
- var text = Encoding.UTF8.GetString(_underlyingStream.ReadBytes(textLen));
- break;
- default:
- //skip unknown chunk
- _underlyingStream.Seek(ck.DataSize, SeekOrigin.Current);
- break;
- }
- _underlyingStream.Seek(_underlyingStream.Position % 2, SeekOrigin.Current);
- }
- break; // case ID_DIIN:
- case ID_DSD:
- _dataOffset = _underlyingStream.Position;
- _dataSize = ck.DataSize;
- _underlyingStream.Seek(ck.DataSize, SeekOrigin.Current);
- continue;
- default:
- //skip unknown chunk
- underlyingStream.Seek(ck.DataSize, SeekOrigin.Current);
- break;
- }
- break;
- }
- //align: pad byte char with value 0, used for making chunks an even length.
- _underlyingStream.Seek(_underlyingStream.Position % 2, SeekOrigin.Current);
- if (_isDstEncoded) throw new NotSupportedException("DST is not support");
- WaveFormat = WaveFormat.CreateCustomFormat(WaveFormatEncoding.Unknown, _sampleRate, _channelCount, _sampleRate / 8 * _channelCount, _channelCount, 1);
- }
- _underlyingStream.Position = _dataOffset;
- }
- protected override void Dispose(bool disposing)
- {
- base.Dispose(disposing);
- if (_disposeStream) _underlyingStream.Dispose();
- }
- public override int Read(byte[] buffer, int offset, int countRequired)
- {
- var mod = countRequired % _channelCount;
- var count = countRequired;
- if (mod != 0) count -= mod;
- var read = _underlyingStream.Read(buffer, offset, count);
- // MSB / LSB Convert?
- for (var i = 0; i < read; i++) buffer[i] = BitReverseTable[buffer[i]];
- return read;
- }
- public override WaveFormat WaveFormat { get; }
- public override long Length => _dataSize;
- public override long Position { get => _underlyingStream.Position - _dataOffset; set => _underlyingStream.Position = _dataOffset + value - value % _channelCount; }
- private static readonly byte[] BitReverseTable =
- {
- 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
- 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
- 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
- 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
- 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
- 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
- 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
- 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
- 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
- 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
- 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
- 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
- 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
- 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
- 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
- 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
- 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
- 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
- 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
- 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
- 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
- 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
- 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
- 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
- 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
- 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
- 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
- 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
- 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
- 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
- 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
- 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
- };
- }
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