/// <summary>
/// Reads in a WaveFormat (with extra data) from a fmt chunk (chunk identifier and
/// length should already have been read)
/// </summary>
/// <param name="br">Binary reader</param>
/// <param name="formatChunkLength">Format chunk length</param>
/// <returns>A WaveFormatExtraData</returns>
public static WaveFormat FromFormatChunk(BinaryReader br, int formatChunkLength)
{
var waveFormat = new WaveFormatExtraData();
waveFormat.ReadWaveFormat(br, formatChunkLength);
waveFormat.ReadExtraData(br);
return(waveFormat);
}
/// <summary>
/// Reads the header part of a WAV file from a stream
/// </summary>
/// <param name="stream">The stream, positioned at the start of audio data</param>
/// <param name="format">The format found</param>
/// <param name="dataChunkPosition">The position of the data chunk</param>
/// <param name="dataChunkLength">The length of the data chunk</param>
/// <param name="chunks">Additional chunks found</param>
public static void ReadWaveHeader(Stream stream, out WaveFormat format, out long dataChunkPosition, out int dataChunkLength, List <RiffChunk> chunks)
{
dataChunkPosition = -1;
BinaryReader br = new BinaryReader(stream);
if (br.ReadInt32() != WaveInterop.mmioStringToFOURCC("RIFF", 0))
{
throw new FormatException("Not a WAVE file - no RIFF header");
}
uint fileSize = br.ReadUInt32(); // read the file size (minus 8 bytes)
if (br.ReadInt32() != WaveInterop.mmioStringToFOURCC("WAVE", 0))
{
throw new FormatException("Not a WAVE file - no WAVE header");
}
// now we expect the format chunk
if (br.ReadInt32() != WaveInterop.mmioStringToFOURCC("fmt ", 0))
{
throw new FormatException("Not a WAVE file - no fmt header");
}
format = new WaveFormatExtraData(br);
Int32 dataChunkID = WaveInterop.mmioStringToFOURCC("data", 0);
dataChunkLength = 0;
// sometimes a file has more data than is specified after the RIFF header
long stopPosition = Math.Min(fileSize + 8, stream.Length);
// this -8 is so we can be sure that there are at least 8 bytes for a chunk id and length
while (stream.Position < stopPosition - 8)
{
Int32 chunkIdentifier = br.ReadInt32();
Int32 chunkLength = br.ReadInt32();
if (chunkIdentifier == dataChunkID)
{
dataChunkPosition = stream.Position;
dataChunkLength = chunkLength;
}
else
{
if (chunks != null)
{
chunks.Add(new RiffChunk(chunkIdentifier, chunkLength, stream.Position));
}
}
stream.Position += chunkLength;
}
}
/// <summary>
/// Reads the header part of a WAV file from a stream
/// </summary>
/// <param name="stream">The stream, positioned at the start of audio data</param>
/// <param name="format">The format found</param>
/// <param name="dataChunkPosition">The position of the data chunk</param>
/// <param name="dataChunkLength">The length of the data chunk</param>
/// <param name="chunks">Additional chunks found</param>
public static void ReadWaveHeader(Stream stream, out WaveFormat format, out long dataChunkPosition, out int dataChunkLength, List<RiffChunk> chunks)
{
dataChunkPosition = -1;
BinaryReader br = new BinaryReader(stream);
if (br.ReadInt32() != WaveInterop.mmioStringToFOURCC("RIFF", 0))
{
throw new FormatException("Not a WAVE file - no RIFF header");
}
uint fileSize = br.ReadUInt32(); // read the file size (minus 8 bytes)
if (br.ReadInt32() != WaveInterop.mmioStringToFOURCC("WAVE", 0))
{
throw new FormatException("Not a WAVE file - no WAVE header");
}
// now we expect the format chunk
if (br.ReadInt32() != WaveInterop.mmioStringToFOURCC("fmt ", 0))
{
throw new FormatException("Not a WAVE file - no fmt header");
}
format = new WaveFormatExtraData(br);
Int32 dataChunkID = WaveInterop.mmioStringToFOURCC("data", 0);
dataChunkLength = 0;
// sometimes a file has more data than is specified after the RIFF header
long stopPosition = Math.Min(fileSize + 8, stream.Length);
// this -8 is so we can be sure that there are at least 8 bytes for a chunk id and length
while (stream.Position < stopPosition - 8)
{
Int32 chunkIdentifier = br.ReadInt32();
Int32 chunkLength = br.ReadInt32();
if (chunkIdentifier == dataChunkID)
{
dataChunkPosition = stream.Position;
dataChunkLength = chunkLength;
}
else
{
if (chunks != null)
{
chunks.Add(new RiffChunk(chunkIdentifier, chunkLength, stream.Position));
}
}
stream.Position += chunkLength;
}
}
/// <summary>
/// Reads in a WaveFormat (with extra data) from a fmt chunk (chunk identifier and
/// length should already have been read)
/// </summary>
/// <param name="br">Binary reader</param>
/// <param name="formatChunkLength">Format chunk length</param>
/// <returns>A WaveFormatExtraData</returns>
public static WaveFormat FromFormatChunk(BinaryReader br, int formatChunkLength)
{
var waveFormat = new WaveFormatExtraData();
waveFormat.ReadWaveFormat(br, formatChunkLength);
waveFormat.ReadExtraData(br);
return waveFormat;
}
