#region --- License ---
/* Licensed under the MIT/X11 license.
* Copyright (c) 2006-2008 the OpenTK Team.
* This notice may not be removed from any source distribution.
* See license.txt for licensing details.
*/
#endregion
using System;
using System.IO;
using OpenTK.Audio;
using System.Diagnostics;
using System.Runtime.InteropServices;
namespace OpenTK.Audio
{
internal sealed class WaveReader : AudioReader
{
SoundData decoded_data;
//RIFF header
string signature;
int riff_chunck_size;
string format;
//WAVE header
string format_signature;
int format_chunk_size;
short audio_format;
short channels;
int sample_rate;
int byte_rate;
short block_align;
short bits_per_sample;
//DATA header
string data_signature;
int data_chunk_size;
BinaryReader reader;
internal WaveReader() { }
internal WaveReader(Stream s)
{
if (s == null) throw new ArgumentNullException();
if (!s.CanRead) throw new ArgumentException("Cannot read from specified Stream.");
reader = new BinaryReader(s);
this.Stream = s;
}
#if false
/// <summary>
/// Writes the WaveSound's data to the specified OpenAL buffer in the correct format.
/// </summary>
/// <param name="bid">
/// A <see cref="System.UInt32"/>
/// </param>
public void WriteToBuffer(uint bid)
{
unsafe
{
//fix the array as a byte
fixed (byte* p_Data = _Data)
{
if (Channels == 1)
{
if (BitsPerSample == 16)
{
Console.Write("Uploading 16 bit mono data to OpenAL...");
AL.BufferData(bid, ALFormat.Mono16, (IntPtr)p_Data, _Data.Length, SampleRate);
}
else
{
if (BitsPerSample == 8)
{
Console.Write("Uploading 8 bit mono data to OpenAL...");
AL.BufferData(bid, ALFormat.Mono8, (IntPtr)p_Data, _Data.Length, SampleRate);
}
}
}
else
{
if (Channels == 2)
{
if (BitsPerSample == 16)
{
Console.Write("Uploading 16 bit stereo data to OpenAL...");
AL.BufferData(bid, ALFormat.Stereo16, (IntPtr)p_Data, _Data.Length, SampleRate);
}
else
{
if (BitsPerSample == 8)
{
Console.Write("Uploading 8 bit stereo data to OpenAL...");
AL.BufferData(bid, ALFormat.Stereo8, (IntPtr)p_Data, _Data.Length, SampleRate);
}
}
}
}
}
}
}
/// <summary>
/// Writes all relevent information about the WaveSound to the console window.
/// </summary>
public void DumpParamsToConsole()
{
Console.WriteLine("AudioFormat:" + AudioFormat);
Console.WriteLine("Channels:" + Channels);
Console.WriteLine("SampleRate:" + SampleRate);
Console.WriteLine("ByteRate:" + ByteRate);
Console.WriteLine("BlockAlign:" + BlockAlign);
Console.WriteLine("BitsPerSample:" + BitsPerSample);
}
/// <value>
/// Returns the WaveSound's raw sound data as an array of bytes.
/// </value>
public byte[] Data
{
get
{
return _Data;
}
}
#endif
#region --- Public Members ---
#region public override bool Supports(Stream s)
/// <summary>
/// Checks whether the specified stream contains valid WAVE/RIFF buffer.
/// </summary>
/// <param name="s">The System.IO.Stream to check.</param>
/// <returns>True if the stream is a valid WAVE/RIFF file; false otherwise.</returns>
public override bool Supports(Stream s)
{
BinaryReader reader = new BinaryReader(s);
return this.ReadHeaders(reader);
}
#endregion
#region public override SoundData ReadSamples(int samples)
/// <summary>
/// Reads and decodes the specified number of samples from the sound stream.
/// </summary>
/// <param name="samples">The number of samples to read and decode.</param>
/// <returns>An OpenTK.Audio.SoundData object that contains the decoded buffer.</returns>
public override SoundData ReadSamples(long samples)
{
if (samples > reader.BaseStream.Length - reader.BaseStream.Position)
samples = reader.BaseStream.Length - reader.BaseStream.Position;
//while (samples > decoded_data.Data.Length * (bits_per_sample / 8))
// Array.Resize<byte>(ref decoded_data.Data, decoded_data.Data.Length * 2);
decoded_data = new SoundData(new SoundFormat(channels, bits_per_sample, sample_rate),
reader.ReadBytes((int)samples));
return decoded_data;
}
#endregion
#region public override SoundData ReadToEnd()
/// <summary>
/// Reads and decodes the sound stream.
/// </summary>
/// <returns>An OpenTK.Audio.SoundData object that contains the decoded buffer.</returns>
public override SoundData ReadToEnd()
{
try
{
//read the buffer into a byte array, even if the format is 16 bit
//decoded_data = new byte[data_chunk_size];
decoded_data = new SoundData(new SoundFormat(channels, bits_per_sample, sample_rate),
reader.ReadBytes((int)reader.BaseStream.Length));
Debug.WriteLine("decoded!");
//return new SoundData(decoded_data, new SoundFormat(channels, bits_per_sample, sample_rate));
return decoded_data;
}
catch (AudioReaderException)
{
reader.Close();
throw;
}
}
#endregion
#endregion
#region --- Protected Members ---
protected override Stream Stream
{
get { return base.Stream; }
set
{
base.Stream = value;
if (!ReadHeaders(reader))
throw new AudioReaderException("Invalid WAVE/RIFF file: invalid or corrupt signature.");
Debug.Write(String.Format("Opened WAVE/RIFF file: ({0}, {1}, {2}, {3}) ", sample_rate.ToString(), bits_per_sample.ToString(),
channels.ToString(), audio_format.ToString()));
}
}
#endregion
#region --- Private Members ---
// Tries to read the WAVE/RIFF headers, and returns true if they are valid.
bool ReadHeaders(BinaryReader reader)
{
// Don't explicitly call reader.Close()/.Dispose(), as that will close the inner stream.
// There's no such danger if the BinaryReader isn't explicitly destroyed.
// RIFF header
signature = new string(reader.ReadChars(4));
if (signature != "RIFF")
return false;
riff_chunck_size = reader.ReadInt32();
format = new string(reader.ReadChars(4));
if (format != "WAVE")
return false;
// WAVE header
format_signature = new string(reader.ReadChars(4));
if (format_signature != "fmt ")
return false;
format_chunk_size = reader.ReadInt32();
audio_format = reader.ReadInt16();
channels = reader.ReadInt16();
sample_rate = reader.ReadInt32();
byte_rate = reader.ReadInt32();
block_align = reader.ReadInt16();
bits_per_sample = reader.ReadInt16();
data_signature = new string(reader.ReadChars(4));
if (data_signature != "data")
return false;
data_chunk_size = reader.ReadInt32();
return true;
}
#endregion
}
}