/// <summary>
/// http://tech.ebu.ch/docs/tech/tech3306-2009.pdf
/// </summary>
private void ReadDs64Chunk(BinaryReader reader)
{
int ds64ChunkId = WaveInterop.mmioStringToFOURCC("ds64", 0);
int chunkId = reader.ReadInt32();
if (chunkId != ds64ChunkId)
{
throw new FormatException("Invalid RF64 WAV file - No ds64 chunk found");
}
int chunkSize = reader.ReadInt32();
riffSize = reader.ReadInt64();
dataChunkLength = reader.ReadInt64();
// ReSharper disable once UnusedVariable
long sampleCount = reader.ReadInt64(); // replaces the value in the fact chunk
reader.ReadBytes(chunkSize - 24); // get to the end of this chunk (should parse extra stuff later)
}
private GCHandle hThis; // for the user callback
/// <summary>
/// creates a new wavebuffer
/// </summary>
/// <param name="waveInHandle">WaveIn device to write to</param>
/// <param name="bufferSize">Buffer size in bytes</param>
public WaveInBuffer(IntPtr waveInHandle, Int32 bufferSize)
{
this.bufferSize = bufferSize;
buffer = new byte[bufferSize];
hBuffer = GCHandle.Alloc(buffer, GCHandleType.Pinned);
this.waveInHandle = waveInHandle;
header = new WaveHeader();
hHeader = GCHandle.Alloc(header);
header.dataBuffer = hBuffer.AddrOfPinnedObject();
header.bufferLength = bufferSize;
header.loops = 1;
hThis = GCHandle.Alloc(this);
header.userData = (IntPtr)hThis;
MmException.Try(WaveInterop.waveInPrepareHeader(waveInHandle, header, Marshal.SizeOf(header)), "waveInPrepareHeader");
//MmException.Try(WaveInterop.waveInAddBuffer(waveInHandle, header, Marshal.SizeOf(header)), "waveInAddBuffer");
}
/// <summary>
/// Stop recording
/// </summary>
public void StopRecording()
{
if (recording)
{
recording = false;
MmException.Try(WaveInterop.waveInStop(waveInHandle), "waveInStop");
// report the last buffers, sometimes more than one, so taking care to report them in the right order
for (int n = 0; n < buffers.Length; n++)
{
int index = (n + lastReturnedBufferIndex + 1) % buffers.Length;
var buffer = buffers[index];
if (buffer.Done)
{
RaiseDataAvailable(buffer);
}
}
RaiseRecordingStopped(null);
}
//MmException.Try(WaveInterop.waveInReset(waveInHandle), "waveInReset");
// Don't actually close yet so we get the last buffer
}
public void ReadWaveHeader(Stream stream)
{
dataChunkPosition = -1;
waveFormat = null;
riffChunks = new List <RiffChunk>();
dataChunkLength = 0;
BinaryReader br = new BinaryReader(stream);
ReadRiffHeader(br);
riffSize = 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");
}
if (isRf64)
{
ReadDs64Chunk(br);
}
int dataChunkID = WaveInterop.mmioStringToFOURCC("data", 0);
int formatChunkId = WaveInterop.mmioStringToFOURCC("fmt ", 0);
// sometimes a file has more data than is specified after the RIFF header
long stopPosition = Math.Min(riffSize + 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;
if (!isRf64) // we already know the dataChunkLength if this is an RF64 file
{
dataChunkLength = chunkLength;
}
stream.Position += chunkLength;
}
else if (chunkIdentifier == formatChunkId)
{
waveFormat = WaveFormat.FromFormatChunk(br, chunkLength);
}
else
{
// check for invalid chunk length
if (chunkLength < 0 || chunkLength > stream.Length - stream.Position)
{
if (strictMode)
{
Debug.Assert(false, String.Format("Invalid chunk length {0}, pos: {1}. length: {2}",
chunkLength, stream.Position, stream.Length));
}
// an exception will be thrown further down if we haven't got a format and data chunk yet,
// otherwise we will tolerate this file despite it having corrupt data at the end
break;
}
if (storeAllChunks)
{
riffChunks.Add(GetRiffChunk(stream, chunkIdentifier, chunkLength));
}
stream.Position += chunkLength;
}
}
if (waveFormat == null)
{
throw new FormatException("Invalid WAV file - No fmt chunk found");
}
if (dataChunkPosition == -1)
{
throw new FormatException("Invalid WAV file - No data chunk found");
}
}