103 lines
2.6 KiB
C#
103 lines
2.6 KiB
C#
using System;
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using System.Linq;
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using System.IO;
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namespace BizHawk.Emulation.DiscSystem
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{
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partial class Disc
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{
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class Blob_WaveFile : IBlob
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{
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[Serializable]
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public class Blob_WaveFile_Exception : Exception
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{
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public Blob_WaveFile_Exception(string message)
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: base(message)
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{
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}
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}
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public Blob_WaveFile()
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{
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}
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public void Load(byte[] waveData)
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{
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}
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public void Load(string wavePath)
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{
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var stream = new FileStream(wavePath, FileMode.Open, FileAccess.Read, FileShare.Read);
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Load(stream);
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}
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public void Load(Stream stream)
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{
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try
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{
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RiffSource = null;
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var rm = new RiffMaster();
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rm.LoadStream(stream);
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RiffSource = rm;
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//analyze the file to make sure its an OK wave file
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if (rm.riff.type != "WAVE")
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{
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throw new Blob_WaveFile_Exception("Not a RIFF WAVE file");
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}
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var fmt = rm.riff.subchunks.FirstOrDefault(chunk => chunk.tag == "fmt ") as RiffMaster.RiffSubchunk_fmt;
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if (fmt == null)
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{
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throw new Blob_WaveFile_Exception("Not a valid RIFF WAVE file (missing fmt chunk");
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}
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if (1 != rm.riff.subchunks.Count(chunk => chunk.tag == "data"))
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{
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//later, we could make a Stream which would make an index of data chunks and walk around them
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throw new Blob_WaveFile_Exception("Multi-data-chunk WAVE files not supported");
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}
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if (fmt.format_tag != RiffMaster.RiffSubchunk_fmt.FORMAT_TAG.WAVE_FORMAT_PCM)
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{
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throw new Blob_WaveFile_Exception("Not a valid PCM WAVE file (only PCM is supported)");
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}
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if (fmt.channels != 2 || fmt.bitsPerSample != 16 || fmt.samplesPerSec != 44100)
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{
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throw new Blob_WaveFile_Exception("Not a CDA format WAVE file (conversion not yet supported)");
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}
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//acquire the start of the data chunk
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var dataChunk = rm.riff.subchunks.FirstOrDefault(chunk => chunk.tag == "data") as RiffMaster.RiffSubchunk;
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waveDataStreamPos = dataChunk.Position;
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mDataLength = dataChunk.Length;
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}
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catch
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{
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Dispose();
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throw;
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}
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}
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public int Read(long byte_pos, byte[] buffer, int offset, int count)
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{
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RiffSource.BaseStream.Position = byte_pos + waveDataStreamPos;
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return RiffSource.BaseStream.Read(buffer, offset, count);
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}
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RiffMaster RiffSource;
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long waveDataStreamPos;
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long mDataLength;
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public long Length { get { return mDataLength; } }
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public void Dispose()
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{
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if(RiffSource != null)
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RiffSource.Dispose();
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RiffSource = null;
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}
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}
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}
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} |