public int Read(byte[] buffer, int offset, int count)
{
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (buffer.Length < count)
{
throw new ArgumentException("Length is too small.", "buffer");
}
lock (_lockObj)
{
int read = 0;
if (_reader == null || _disposed)
{
return(read);
}
if (_decoderBufferCount > 0)
{
read += CopyDecoderBuffer(buffer, offset + read, count - read);
}
while (read < count)
{
MFSourceReaderFlag flags;
long timestamp;
int actualStreamIndex;
using (var sample = _reader.ReadSample(MFInterops.MF_SOURCE_READER_FIRST_AUDIO_STREAM, 0, out actualStreamIndex, out flags, out timestamp))
{
if (flags != MFSourceReaderFlag.None)
{
break;
}
using (MFMediaBuffer mediaBuffer = sample.ConvertToContinousBuffer())
{
int maxlength, currentlength;
IntPtr pdata = mediaBuffer.Lock(out maxlength, out currentlength);
_decoderBuffer = _decoderBuffer.CheckBuffer(currentlength);
Marshal.Copy(pdata, _decoderBuffer, 0, currentlength);
_decoderBufferCount = currentlength;
_decoderBufferOffset = 0;
int tmp = CopyDecoderBuffer(buffer, offset + read, count - read);
read += tmp;
mediaBuffer.Unlock();
}
}
}
_position += read;
return(read);
}
}
/// <summary>
/// Reads a sequence of bytes from the <see cref="MediaFoundationDecoder" /> and advances the position within the
/// stream by the
/// number of bytes read.
/// </summary>
/// <param name="buffer">
/// An array of bytes. When this method returns, the <paramref name="buffer" /> contains the specified
/// byte array with the values between <paramref name="offset" /> and (<paramref name="offset" /> +
/// <paramref name="count" /> - 1) replaced by the bytes read from the current source.
/// </param>
/// <param name="offset">
/// The zero-based byte offset in the <paramref name="buffer" /> at which to begin storing the data
/// read from the current stream.
/// </param>
/// <param name="count">The maximum number of bytes to read from the current source.</param>
/// <returns>The total number of bytes read into the buffer.</returns>
public int Read(byte[] buffer, int offset, int count)
{
CheckForDisposed();
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (buffer.Length < count)
{
throw new ArgumentException("Length is too small.", "buffer");
}
lock (_lockObj)
{
int read = 0;
if (_reader == null || _disposed)
{
return(read);
}
if (_decoderBufferCount > 0)
{
read += CopyDecoderBuffer(buffer, offset + read, count - read);
}
while (read < count)
{
MFSourceReaderFlags flags;
long timestamp;
int actualStreamIndex;
using (
MFSample sample = _reader.ReadSample(NativeMethods.MF_SOURCE_READER_FIRST_AUDIO_STREAM, 0,
out actualStreamIndex, out flags, out timestamp))
{
if (flags != MFSourceReaderFlags.None)
{
break;
}
var sampleTime = sample.GetSampleTime();
if (_positionChanged && timestamp > 0)
{
long actualPosition = NanoSecond100UnitsToBytes(sampleTime);
int bytesToSkip = (int)(_position - actualPosition);
_position = actualPosition;
_positionChanged = false;
SkipBytes(bytesToSkip);
}
using (MFMediaBuffer mediaBuffer = sample.ConvertToContiguousBuffer())
{
using (MFMediaBuffer.LockDisposable @lock = mediaBuffer.Lock())
{
_decoderBuffer = _decoderBuffer.CheckBuffer(@lock.CurrentLength);
Marshal.Copy(@lock.Buffer, _decoderBuffer, 0, @lock.CurrentLength);
_decoderBufferCount = @lock.CurrentLength;
_decoderBufferOffset = 0;
int tmp = CopyDecoderBuffer(buffer, offset + read, count - read);
read += tmp;
}
}
}
}
_position += read;
return(read);
}
}
