예제 #1
0
        private long CalculateDataStartOffset()
        {
            long offset = CalculateEntryNamesOffset();

            foreach (IPackfileEntry entry in Files)
            {
                offset  = offset.Align(2);
                offset += entry.Name.Length;
                offset += 2;
                offset  = offset.Align(2);
            }

            return(offset);
        }
예제 #2
0
        public static long EstimateHeaderSize(IEnumerable <string> paths)
        {
            long size = 4 + 4 + 4 + 4;

            foreach (var path in paths)
            {
                size += 4 + Encoding.ASCII.GetByteCount(path).Align(4) + 4 + 4;
            }
            return(size.Align(16));
        }
예제 #3
0
        private IEnumerable <PartitionInstance> CreateInstances()
        {
            const int dataOffsetDelta = -8;

            var  endian = this._Partition.Endian;
            long offset = (int)this._Partition.StringTableSize;

            for (int i = 0; i < this._Partition.InstanceEntries.Count; i++)
            {
                var instance       = this._Partition.InstanceEntries[i];
                var typeDefinition = this._Partition.TypeDefinitionEntries[instance.TypeIndex];
                var typeSize       = typeDefinition.Alignment == 4
                                   ? (typeDefinition.DataSize + dataOffsetDelta).Align(typeDefinition.Alignment)
                                   : ((int)typeDefinition.DataSize).Align(typeDefinition.Alignment);
                var flattenedType = this._FlattenedTypes[instance.TypeIndex];
                for (int j = 0; j < instance.Count; j++)
                {
                    offset = offset.Align(typeDefinition.Alignment);

                    var guid = Guid.Empty;
                    if (i < this._Partition.NamedInstanceCount)
                    {
                        this._Data.Position = offset;
                        guid    = this._Data.ReadValueGuid(endian);
                        offset += 16;
                    }

                    var instanceOffset = offset;
                    if (typeDefinition.Alignment == 4)
                    {
                        instanceOffset += dataOffsetDelta;
                    }

                    yield return(new PartitionInstance(this, guid, instanceOffset, flattenedType));

                    offset += typeSize;
                }
            }
        }
예제 #4
0
        protected void Build(
            TPackage package,
            IEnumerable <KeyValuePair <string, string> > paths,
            string outputPath,
            bool ps3)
        {
            var isCompressed = (package.Flags & Package.HeaderFlags.Compressed) != 0;
            var isCondensed  = (package.Flags & Package.HeaderFlags.Condensed) != 0;

            package.Entries.Clear();
            foreach (var kv in paths)
            {
                package.Entries.Add(new TEntry()
                {
                    Name = kv.Key,
                });
            }

            var baseOffset = package.EstimateHeaderSize();

            package.Entries.Clear();
            using (var output = File.Create(outputPath))
            {
                if (isCondensed == true &&
                    isCompressed == true)
                {
                    output.Seek(baseOffset, SeekOrigin.Begin);

                    using (var compressed = new MemoryStream())
                    {
                        var z = new ZLIB.ZOutputStream(compressed, ZLIB.zlibConst.Z_BEST_COMPRESSION);
                        z.FlushMode = ZLIB.zlibConst.Z_SYNC_FLUSH;

                        long offset = 0;
                        foreach (var kv in paths)
                        {
                            using (var input = File.OpenRead(kv.Value))
                            {
                                var entry = new TEntry();
                                entry.Name             = kv.Key;
                                entry.Offset           = (uint)offset;
                                entry.UncompressedSize = (uint)input.Length;

                                long size = z.TotalOut;

                                z.WriteFromStream(input, input.Length);

                                size = z.TotalOut - size;

                                entry.CompressedSize = (uint)size;

                                offset += entry.UncompressedSize;

                                package.Entries.Add(entry);
                            }
                        }

                        package.CompressedSize   = (uint)compressed.Length;
                        package.UncompressedSize = (uint)offset;

                        compressed.Position = 0;
                        output.WriteFromStream(compressed, compressed.Length);
                    }

                    output.Seek(0, SeekOrigin.Begin);
                    package.Serialize(output);
                }
                else if (
                    ps3 == true &&
                    isCompressed == true)
                {
                    output.Seek(baseOffset, SeekOrigin.Begin);

                    long offset           = 0;
                    uint uncompressedSize = 0;

                    foreach (var kv in paths)
                    {
                        using (var input = File.OpenRead(kv.Value))
                        {
                            if (isCondensed == false)
                            {
                                var offsetPadding =
                                    offset.Align(2048) - offset;
                                if (offsetPadding > 0)
                                {
                                    offset += offsetPadding;
                                    output.Seek(offsetPadding, SeekOrigin.Current);
                                }

                                var sizePadding =
                                    uncompressedSize.Align(2048) - uncompressedSize;
                                if (sizePadding > 0)
                                {
                                    uncompressedSize += sizePadding;
                                }
                            }

                            var entry = new TEntry();
                            entry.Name             = kv.Key;
                            entry.Offset           = (uint)offset;
                            entry.UncompressedSize = (uint)input.Length;
                            entry.CompressedSize   = 0;

                            var left = input.Length;
                            while (left > 0)
                            {
                                using (var compressed = new MemoryStream())
                                {
                                    var chunkUncompressedSize = (uint)Math.Min(0x10000, left);

                                    var zlib = new DeflaterOutputStream(compressed, new Deflater(9, true));
                                    zlib.WriteFromStream(input, chunkUncompressedSize);
                                    zlib.Finish();

                                    var chunkCompressedSize = (uint)compressed.Length;

                                    if (chunkCompressedSize > 0xFFFF)
                                    {
                                        throw new InvalidOperationException();
                                    }

                                    output.WriteValueU16((ushort)chunkCompressedSize, package.Endian);
                                    output.WriteValueU16(0, package.Endian);
                                    output.WriteValueU32(chunkUncompressedSize, package.Endian);

                                    entry.CompressedSize += 2 + 2 + 4;
                                    entry.CompressedSize += chunkCompressedSize;

                                    compressed.Position = 0;
                                    output.WriteFromStream(compressed, compressed.Length);

                                    left -= chunkUncompressedSize;
                                }
                            }

                            offset           += entry.CompressedSize;
                            uncompressedSize += entry.UncompressedSize;

                            package.Entries.Add(entry);
                        }
                    }

                    package.CompressedSize   = (uint)offset;
                    package.UncompressedSize = uncompressedSize;
                }
                else if (isCompressed == true)
                {
                    output.Seek(baseOffset, SeekOrigin.Begin);

                    long offset           = 0;
                    uint uncompressedSize = 0;

                    foreach (var kv in paths)
                    {
                        using (var input = File.OpenRead(kv.Value))
                        {
                            if (isCondensed == false)
                            {
                                var offsetPadding =
                                    offset.Align(2048) - offset;
                                if (offsetPadding > 0)
                                {
                                    offset += offsetPadding;
                                    output.Seek(offsetPadding, SeekOrigin.Current);
                                }

                                var sizePadding =
                                    uncompressedSize.Align(2048) - uncompressedSize;
                                if (sizePadding > 0)
                                {
                                    uncompressedSize += sizePadding;
                                }
                            }

                            var entry = new TEntry();
                            entry.Name             = kv.Key;
                            entry.Offset           = (uint)offset;
                            entry.UncompressedSize = (uint)input.Length;

                            using (var compressed = new MemoryStream())
                            {
                                var zlib = new DeflaterOutputStream(compressed);
                                zlib.WriteFromStream(input, input.Length);
                                zlib.Finish();

                                entry.CompressedSize = (uint)compressed.Length;

                                compressed.Position = 0;
                                output.WriteFromStream(compressed, compressed.Length);
                            }

                            offset           += entry.CompressedSize;
                            uncompressedSize += entry.UncompressedSize;

                            package.Entries.Add(entry);
                        }
                    }

                    package.CompressedSize   = (uint)offset;
                    package.UncompressedSize = uncompressedSize;
                }
                else
                {
                    output.Seek(baseOffset, SeekOrigin.Begin);

                    long offset = 0;

                    foreach (var kv in paths)
                    {
                        using (var input = File.OpenRead(kv.Value))
                        {
                            if (isCondensed == false)
                            {
                                var padding = offset.Align(2048) - offset;
                                if (padding > 0)
                                {
                                    offset += padding;
                                    output.Seek(padding, SeekOrigin.Current);
                                }
                            }
                            else if (
                                isCondensed == true &&
                                isCompressed == false)
                            {
                                var padding = offset.Align(16) - offset;
                                if (padding > 0)
                                {
                                    offset += padding;
                                    output.Seek(padding, SeekOrigin.Current);
                                }
                            }

                            var entry = new TEntry();
                            entry.Name             = kv.Key;
                            entry.Offset           = (uint)offset;
                            entry.UncompressedSize = (uint)input.Length;

                            output.WriteFromStream(input, input.Length);

                            entry.CompressedSize = 0xFFFFFFFF;
                            offset += entry.UncompressedSize;

                            package.Entries.Add(entry);
                        }
                    }

                    package.CompressedSize   = 0xFFFFFFFF;
                    package.UncompressedSize = (uint)offset;
                }

                package.TotalSize = (uint)output.Length;
                output.Seek(0, SeekOrigin.Begin);
                package.Serialize(output);
            }
        }
예제 #5
0
        public static void Main(string[] args)
        {
            bool showHelp       = false;
            bool verbose        = false;
            bool stripFileNames = false;

            OptionSet options = new OptionSet()
            {
                {
                    "v|verbose",
                    "be verbose",
                    v => verbose = v != null
                },
                {
                    "s|strip",
                    "strip file names",
                    v => stripFileNames = v != null
                },
                {
                    "h|help",
                    "show this message and exit",
                    v => showHelp = v != null
                },
            };

            List <string> extras;

            try
            {
                extras = options.Parse(args);
            }
            catch (OptionException e)
            {
                Console.Write("{0}: ", GetExecutableName());
                Console.WriteLine(e.Message);
                Console.WriteLine("Try `{0} --help' for more information.", GetExecutableName());
                return;
            }

            if (extras.Count < 1 || showHelp == true)
            {
                Console.WriteLine("Usage: {0} [OPTIONS]+ output_erf input_directory+", GetExecutableName());
                Console.WriteLine("Pack files from input directories into a Encapsulated Resource File.");
                Console.WriteLine();
                Console.WriteLine("Options:");
                options.WriteOptionDescriptions(Console.Out);
                return;
            }

            var    inputPaths = new List <string>();
            string outputPath;

            if (extras.Count == 1)
            {
                inputPaths.Add(extras[0]);
                outputPath = Path.ChangeExtension(extras[0], ".erf");
            }
            else
            {
                outputPath = extras[0];
                inputPaths.AddRange(extras.Skip(1));
            }

            var paths  = new SortedDictionary <ulong, string>();
            var lookup = new Dictionary <ulong, string>();

            if (verbose == true)
            {
                Console.WriteLine("Finding files...");
            }

            foreach (var relPath in inputPaths)
            {
                string inputPath = Path.GetFullPath(relPath);

                if (inputPath.EndsWith(Path.DirectorySeparatorChar.ToString()) == true)
                {
                    inputPath = inputPath.Substring(0, inputPath.Length - 1);
                }

                foreach (string path in Directory.GetFiles(inputPath, "*", SearchOption.AllDirectories))
                {
                    bool   hasName;
                    string fullPath = Path.GetFullPath(path);
                    string partPath = fullPath.Substring(inputPath.Length + 1).ToLowerInvariant();

                    ulong hash = 0xFFFFFFFFFFFFFFFFul;
                    if (partPath.ToUpper().StartsWith("__UNKNOWN") == true)
                    {
                        string partName;
                        partName = Path.GetFileNameWithoutExtension(partPath);
                        if (partName.Length > 8)
                        {
                            partName = partName.Substring(0, 8);
                        }

                        hash = ulong.Parse(
                            partName,
                            System.Globalization.NumberStyles.AllowHexSpecifier);
                        hasName = false;
                    }
                    else
                    {
                        hash    = partPath.ToLowerInvariant().HashFNV64();
                        hasName = true;
                    }

                    if (paths.ContainsKey(hash) == true)
                    {
                        Console.WriteLine("Ignoring {0} duplicate.", partPath);
                        continue;
                    }

                    paths[hash] = fullPath;

                    if (hasName == false)
                    {
                        partPath = null;
                    }
                    else if (stripFileNames == true &&
                             Path.GetExtension(fullPath) != ".gda")
                    {
                        partPath = null;
                    }

                    lookup[hash] = partPath;
                }
            }

            using (var output = File.Open(outputPath, FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite))
            {
                var erf = new ERF();
                erf.Version     = EncapsulatedResourceFile.FileVersion.V3_0;
                erf.Compression = ERF.CompressionScheme.None;
                erf.Encryption  = ERF.EncryptionScheme.None;
                erf.ContentId   = 0;

                if (verbose == true)
                {
                    Console.WriteLine("Adding files...");
                }

                long headerSize = ERF.CalculateHeaderSize(
                    erf.Version,
                    lookup.Values.ToArray(),
                    paths.Count);
                long baseOffset = headerSize.Align(16);

                if (verbose == true)
                {
                    Console.WriteLine("Writing to disk...");
                }

                erf.Entries.Clear();
                output.Seek(baseOffset, SeekOrigin.Begin);
                foreach (var kvp in paths)
                {
                    if (verbose == true)
                    {
                        Console.WriteLine(kvp.Value);
                    }

                    using (var input = File.Open(kvp.Value, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
                    {
                        var entry = new ERF.Entry()
                        {
                            Name             = lookup[kvp.Key],
                            NameHash         = kvp.Key,
                            TypeHash         = 0,
                            Offset           = output.Position,
                            CompressedSize   = (uint)input.Length,
                            UncompressedSize = (uint)input.Length,
                        };

                        if (entry.Name != null)
                        {
                            entry.CalculateHashes();
                        }
                        else
                        {
                            var extension = Path.GetExtension(kvp.Value);
                            entry.TypeHash = extension == null
                                                 ? 0
                                                 : extension.Trim('.').HashFNV32();
                        }

                        output.WriteFromStream(input, input.Length);
                        output.Seek(output.Position.Align(16), SeekOrigin.Begin);
                        erf.Entries.Add(entry);
                    }
                }

                output.Seek(0, SeekOrigin.Begin);
                erf.Serialize(output);

                if (output.Position != headerSize)
                {
                    throw new InvalidOperationException();
                }
            }
        }
예제 #6
0
        private static ulong PackDataBlock(Stream target, List <HyoutaArchiveFileInfo> files, byte packedAlignment, EndianUtils.Endianness endian)
        {
            byte smallPackedAlignment = ToSmallPackedAlignment(packedAlignment);

            long startPosition = target.Position;

            target.WriteUInt16(0);             // offsetToFirstFileInfo, fill in later

            bool hasDummyContent    = files.Any(x => x.DummyContent != null);
            uint dummyContentLength = hasDummyContent ? ((uint)files.Max(x => x.DummyContent?.Length ?? 0)).Align(1 << smallPackedAlignment) : 0;
            bool hasFilename        = files.Any(x => x.Filename != null);
            uint filenameLength     = 0;
            //bool embedFilenamesInFileInfo = false;
            List <byte[]?>?encodedFilenames = null;

            if (hasFilename)
            {
                // figure out whether we want the strings to embed into the fileinfo directly
                // or whether to use an offset and write the string data at the end of the fileinfo
                // note that if a string is <= 8 bytes we can always embed it as we'd need 8 bytes for the offset anyway
                // so...
                encodedFilenames = new List <byte[]?>(files.Count);
                long longestBytecount        = 0;
                long totalBytecount          = 0;
                long filenameCountOver8Bytes = 0;
                for (int i = 0; i < files.Count; ++i)
                {
                    var currentFilename = files[i].Filename;
                    if (currentFilename == null)
                    {
                        encodedFilenames.Add(null);
                    }
                    else
                    {
                        byte[] stringbytes = EncodeString(currentFilename);
                        encodedFilenames.Add(stringbytes);

                        if (stringbytes.LongLength > 8)
                        {
                            longestBytecount = Math.Max(longestBytecount, stringbytes.LongLength);
                            totalBytecount  += stringbytes.LongLength;
                            ++filenameCountOver8Bytes;
                        }
                    }
                }

                // alright so we have, in practice, two options here
                // - make filenameLength == 16, store strings that are longer than that offsetted
                long nonEmbedSize = files.Count * 16 + totalBytecount.Align(1 << smallPackedAlignment);
                // - make filenameLength long enough so all strings can be embedded
                long embedSize = files.Count * (8 + longestBytecount).Align(1 << smallPackedAlignment);

                // pick whatever results in a smaller file; on a tie embed
                if (nonEmbedSize < embedSize)
                {
                    //embedFilenamesInFileInfo = false;
                    filenameLength = 16;
                }
                else
                {
                    //embedFilenamesInFileInfo = true;
                    filenameLength = (uint)(8 + longestBytecount).Align(1 << smallPackedAlignment);
                }
            }
            bool hasCompression        = files.Any(x => x.CompressionInfo != null);
            uint compressionInfoLength = hasCompression ? files.Max(x => x.CompressionInfo?.MaximumCompressionInfoLength() ?? 0).Align(1 << smallPackedAlignment) : 0;
            bool hasBpsPatch           = files.Any(x => x.BpsPatchInfo != null);
            uint bpsPatchInfoLength    = hasBpsPatch ? 16u.Align(1 << smallPackedAlignment) : 0;
            bool hasCrc32           = files.Any(x => x.crc32 != null);
            uint crc32ContentLength = hasCrc32 ? 4u.Align(1 << smallPackedAlignment) : 0u;
            bool hasMd5             = files.Any(x => x.md5 != null);
            uint md5ContentLength   = hasMd5 ? 16u.Align(1 << smallPackedAlignment) : 0u;
            bool hasSha1            = files.Any(x => x.sha1 != null);
            uint sha1ContentLength  = hasSha1 ? 20u.Align(1 << smallPackedAlignment) : 0u;

            ushort contentBitfield1 = 0;

            contentBitfield1 |= (ushort)(hasDummyContent ? 0x0001u : 0);
            contentBitfield1 |= (ushort)(hasFilename ? 0x0002u : 0);
            contentBitfield1 |= (ushort)(hasCompression ? 0x0004u : 0);
            contentBitfield1 |= (ushort)(hasBpsPatch ? 0x0008u : 0);
            contentBitfield1 |= (ushort)(hasCrc32 ? 0x0010u : 0);
            contentBitfield1 |= (ushort)(hasMd5 ? 0x0020u : 0);
            contentBitfield1 |= (ushort)(hasSha1 ? 0x0040u : 0);
            target.WriteUInt16(contentBitfield1, endian);

            if (hasDummyContent)
            {
                WriteContentLength(dummyContentLength, target, endian);
            }
            if (hasFilename)
            {
                WriteContentLength(filenameLength, target, endian);
            }
            if (hasCompression)
            {
                WriteContentLength(compressionInfoLength, target, endian);
            }
            if (hasBpsPatch)
            {
                WriteContentLength(bpsPatchInfoLength, target, endian);
            }
            if (hasCrc32)
            {
                WriteContentLength(crc32ContentLength, target, endian);
            }
            if (hasMd5)
            {
                WriteContentLength(md5ContentLength, target, endian);
            }
            if (hasSha1)
            {
                WriteContentLength(sha1ContentLength, target, endian);
            }

            long offsetToFirstFileInfo = (target.Position - startPosition).Align(1 << smallPackedAlignment);

            StreamUtils.WriteZeros(target, offsetToFirstFileInfo - (target.Position - startPosition));
            target.Position = startPosition;
            WriteContentLength((uint)offsetToFirstFileInfo, target, endian);
            target.Position = startPosition + offsetToFirstFileInfo;

            long singleFileInfoLength  = 16 + dummyContentLength + filenameLength + compressionInfoLength + bpsPatchInfoLength + crc32ContentLength + md5ContentLength + sha1ContentLength;
            long totalFileInfoLength   = singleFileInfoLength * files.Count;
            long offsetToEndOfFileInfo = (offsetToFirstFileInfo + totalFileInfoLength).Align(1 << smallPackedAlignment);

            StreamUtils.WriteZeros(target, offsetToEndOfFileInfo - offsetToFirstFileInfo);

            var filedata = new List <(long position, DuplicatableStream data)>(files.Count);

            long positionOfFreeSpace = offsetToEndOfFileInfo;

            for (int i = 0; i < files.Count; ++i)
            {
                HyoutaArchiveFileInfo fi = files[i];
                var fiData = fi.Data;
                if (fiData == null)
                {
                    throw new Exception("Data of file " + i + " is null.");
                }
                using (DuplicatableStream fs = fiData.Duplicate()) {
                    DuplicatableStream streamToWrite = fs;

                    bool streamIsInternallyCompressed = fi.StreamIsCompressed;
                    if (fi.BpsPatchInfo != null && fi.CompressionInfo != null && streamIsInternallyCompressed && !fi.StreamIsBpsPatch)
                    {
                        // this is a weird case; the stream wants both bps patch and compression
                        // and is already compressed but not already bps patched, which breaks the defined order
                        // we can handle this by decompressing, creating patch, recompressing
                        streamToWrite = fi.DataStream.Duplicate();                    // this decompresses the stream
                        streamIsInternallyCompressed = false;                         // and fake-set the stream as uncompressed for packing logic
                    }

                    byte[]? bpsPatchInfoBytes    = null;
                    byte[]? compressionInfoBytes = null;
                    if (hasBpsPatch)
                    {
                        if (fi.BpsPatchInfo == null)
                        {
                            // chunk has patches but this file is unpatched; we store this by pointing the file to itself
                            bpsPatchInfoBytes = new HyoutaArchiveBpsPatchInfo((ulong)i, (ulong)streamToWrite.Length, null).Serialize(endian);
                        }
                        else if (fi.StreamIsBpsPatch)
                        {
                            bpsPatchInfoBytes = fi.BpsPatchInfo.Serialize(endian);
                        }
                        else
                        {
                            var p = HyoutaArchiveBps.CreatePatch(fi.BpsPatchInfo, streamToWrite, endian);
                            bpsPatchInfoBytes = p.patchInfo;
                            streamToWrite     = new DuplicatableByteArrayStream(p.patchData);
                        }
                    }
                    if (hasCompression && fi.CompressionInfo != null)
                    {
                        if (streamIsInternallyCompressed)
                        {
                            compressionInfoBytes = fi.CompressionInfo.Serialize(endian);
                        }
                        else
                        {
                            var p = fi.CompressionInfo.Compress(streamToWrite, endian);
                            compressionInfoBytes = p.compressionInfo;
                            streamToWrite        = new DuplicatableByteArrayStream(p.compressedData);
                        }
                    }

                    // write file info
                    target.Position = (singleFileInfoLength * i) + offsetToFirstFileInfo + startPosition;
                    long positionPosition = target.Position;
                    target.WriteUInt64(0);                     // position of file, will be filled later
                    target.WriteUInt64((ulong)streamToWrite.Length, endian);
                    if (hasDummyContent)
                    {
                        if (fi.DummyContent != null)
                        {
                            target.Write(fi.DummyContent);
                            target.WriteZeros(dummyContentLength - fi.DummyContent.Length);
                        }
                        else
                        {
                            target.WriteZeros(dummyContentLength);
                        }
                    }
                    if (hasFilename)
                    {
                        if (fi.Filename != null)
                        {
                            var efn = encodedFilenames ![i];
예제 #7
0
        public static void PrepareRawBnsfFromWav(string path, int targetSampleRate)
        {
            try {
                using (var fs = new DuplicatableFileStream(path + ".wav")) {
                    fs.Position = 0x16;
                    ushort channels   = fs.ReadUInt16(EndianUtils.Endianness.LittleEndian);
                    uint   samplerate = fs.ReadUInt32(EndianUtils.Endianness.LittleEndian);
                    fs.Position = 0x2c;
                    long samplecount       = (fs.Length - 0x2c) / 2;
                    long samplesPerChannel = samplecount / channels;
                    short[,] samples = new short[channels, samplesPerChannel];

                    for (long i = 0; i < samplesPerChannel; ++i)
                    {
                        for (long j = 0; j < channels; ++j)
                        {
                            samples[j, i] = fs.ReadInt16(EndianUtils.Endianness.LittleEndian);
                        }
                    }

                    short[,] outsamples;
                    long outSampleCountPerChannel;
                    if (samplerate == targetSampleRate)
                    {
                        outSampleCountPerChannel = samplesPerChannel;
                        outsamples = samples;
                    }
                    else if (targetSampleRate * 3 == samplerate * 2)
                    {
                        outSampleCountPerChannel = (samplesPerChannel.Align(3) * 2) / 3;
                        outsamples = new short[channels, outSampleCountPerChannel];
                        for (long ch = 0; ch < channels; ++ch)
                        {
                            long sourcePos = 0;
                            for (long s = 0; s < outSampleCountPerChannel; s += 2)
                            {
                                int sample0 = sourcePos < samplesPerChannel ? samples[ch, sourcePos] : 0;
                                ++sourcePos;
                                int sample1 = sourcePos < samplesPerChannel ? samples[ch, sourcePos] : sample0;
                                ++sourcePos;
                                int sample2 = sourcePos < samplesPerChannel ? samples[ch, sourcePos] : sample1;
                                ++sourcePos;

                                outsamples[ch, s]     = (short)LerpTwoThirds(sample0, sample1);
                                outsamples[ch, s + 1] = (short)LerpTwoThirds(sample2, sample1);
                            }
                        }
                    }
                    else
                    {
                        throw new Exception("unsupported sample rate conversion");
                    }

                    using (var nfs = new FileStream(path + ".raw", FileMode.Create)) {
                        for (long ch = 0; ch < channels; ++ch)
                        {
                            for (long s = 0; s < outSampleCountPerChannel; ++s)
                            {
                                nfs.WriteInt16(outsamples[ch, s], EndianUtils.Endianness.LittleEndian);
                            }
                        }
                    }
                    using (var nfs = new FileStream(path + ".samplecount", FileMode.Create)) {
                        nfs.WriteUInt64((ulong)outSampleCountPerChannel, EndianUtils.Endianness.LittleEndian);
                    }

                    return;
                }
            } catch (Exception ex) {
                System.IO.File.WriteAllText(path + ".error", ex.ToString());
            }
        }