コード例 #1
0
ファイル: At9Reader.cs プロジェクト: soneek/VGAudio
        private static void ValidateAt9File(RiffParser parser)
        {
            if (parser.RiffChunk.Type != "WAVE")
            {
                throw new InvalidDataException("Not a valid WAVE file");
            }

            WaveFmtChunk      fmt = parser.GetSubChunk <WaveFmtChunk>("fmt ") ?? throw new InvalidDataException("File must have a valid fmt chunk");
            At9WaveExtensible ext = fmt.Ext as At9WaveExtensible ?? throw new InvalidDataException("File must have a format chunk extension");

            if (parser.GetSubChunk <At9FactChunk>("fact") == null)
            {
                throw new InvalidDataException("File must have a valid fact chunk");
            }
            if (parser.GetSubChunk <At9DataChunk>("data") == null)
            {
                throw new InvalidDataException("File must have a valid data chunk");
            }

            if (fmt.ChannelCount == 0)
            {
                throw new InvalidDataException("Channel count must not be zero");
            }

            if (ext.SubFormat != MediaSubtypes.MediaSubtypeAtrac9)
            {
                throw new InvalidDataException($"Must contain ATRAC9 data. Has unsupported SubFormat {ext.SubFormat}");
            }
        }
コード例 #2
0
ファイル: At9DataChunk.cs プロジェクト: LazyBone152/XV2-Tools
        public At9DataChunk(RiffParser parser, BinaryReader reader) : base(reader)
        {
            // Do not trust the BlockAlign field in the fmt chunk to equal the superframe size.
            // Some AT9 files have an invalid number in there.
            // Calculate the size using the ATRAC9 DataConfig instead.

            At9WaveExtensible ext = parser.GetSubChunk <WaveFmtChunk>("fmt ")?.Ext as At9WaveExtensible ??
                                    throw new InvalidDataException("fmt chunk must come before data chunk");

            At9FactChunk fact = parser.GetSubChunk <At9FactChunk>("fact") ??
                                throw new InvalidDataException("fact chunk must come before data chunk");

            var config = new Atrac9Config(ext.ConfigData);

            FrameCount = (fact.SampleCount + fact.EncoderDelaySamples).DivideByRoundUp(config.SuperframeSamples);
            int dataSize = FrameCount * config.SuperframeBytes;

            if (dataSize > reader.BaseStream.Length - reader.BaseStream.Position)
            {
                throw new InvalidDataException("Required AT9 length is greater than the number of bytes remaining in the file.");
            }

            AudioData = reader.BaseStream.DeInterleave(dataSize, config.SuperframeBytes, FrameCount);
        }