示例#1
0
 private void ParseRiff(byte[] bytes)
 {
     Sanity.Requires(bytes.Length >= 44, "File size less than 44 bytes.");
     Sanity.Requires(Encoding.ASCII.GetString(bytes, 0, 4) == "RIFF", "File is not RIFF.");
     Sanity.Requires(Encoding.ASCII.GetString(bytes, 8, 4) == "WAVE", "File is not WAVE.");
     ParseChunk(bytes, 12);
     PostProcess();
 }
示例#2
0
 private void ParseFormat()
 {
     Sanity.Requires(FormatChunk.Size >= 16, "Format chunk is less than 16.");
     AudioTypeId   = BitConverter.ToInt16(Bytes, FormatChunk.Offset + 8);
     NumChannels   = BitConverter.ToInt16(Bytes, FormatChunk.Offset + 10);
     SampleRate    = BitConverter.ToInt32(Bytes, FormatChunk.Offset + 12);
     ByteRate      = BitConverter.ToInt32(Bytes, FormatChunk.Offset + 16);
     BlockAlign    = BitConverter.ToInt16(Bytes, FormatChunk.Offset + 20);
     BitsPerSample = BitConverter.ToInt16(Bytes, FormatChunk.Offset + 22);
     Sanity.Requires((BitsPerSample & 7) == 0, "Bits per sample is not a multiple of 8.");
     Sanity.Requires(ByteRate == (NumChannels * SampleRate * BitsPerSample) >> 3, "Byte rate, channel, sample rate, bits per sampel error.");
     Sanity.Requires(BlockAlign == NumChannels * BitsPerSample >> 3, "Block align, channel, bits per sample error.");
 }
示例#3
0
        private void ParseChunk(byte[] bytes, int offset)
        {
            // A valid audio.
            if (offset == bytes.Length)
            {
                return;
            }
            // Ignore the uncomplete chunk. Since we only shallow parse here.
            if (offset + 8 > bytes.Length)
            {
                return;
            }
            string chunkName = Encoding.ASCII.GetString(bytes, offset, 4);
            int    chunkSize = BitConverter.ToInt32(bytes, offset + 4);
            bool   complete  = offset + 8 + chunkSize <= bytes.Length;
            Chunk  chunk     = new Chunk {
                Name = chunkName, Offset = offset, Size = chunkSize, Complete = complete
            };

            if (chunk.Name == "fmt ")
            {
                Sanity.Requires(complete, "Format chunk is imcomplete.");
                Sanity.Requires(FormatChunk.Name == "", "More than one format chunk.");
                FormatChunk = chunk;
            }
            else if (chunk.Name == "data")
            {
                Sanity.Requires(DataChunk.Name == "", "More than one data chunk.");
                DataChunk = chunk;
            }
            ChunkList.Add(chunk);
            if (complete)
            {
                ParseChunk(bytes, offset + 8 + chunkSize);
            }
        }
示例#4
0
 public void PostProcess()
 {
     Sanity.Requires(FormatChunk.Name != "", "Missing format chunk.");
     Sanity.Requires(DataChunk.Name != "", "Missing data chunk.");
     ParseFormat();
 }