/// <summary>
/// Add a frame to the output file
/// </summary>
/// <param name="hBitmap">Frame to add</param>
public void AppendNewFrame(Bitmap hBitmap)
{
int hr = 0;
INSSBuffer pSample = null;
Rectangle r = new Rectangle(0, 0, hBitmap.Width, hBitmap.Height);
BitmapData bmd;
if (!m_Init)
{
// Only call this for the first frame
Initialize(hBitmap);
}
// Lock the bitmap, which gets us a pointer to the raw bitmap data
bmd = hBitmap.LockBits(r, ImageLockMode.ReadOnly, hBitmap.PixelFormat);
try
{
// Compute size of bitmap in bytes. Strides may be negative.
int iSize = Math.Abs(bmd.Stride * bmd.Height);
IntPtr ip;
// Get a sample interface
hr = m_pWMWriter.AllocateSample(iSize, out pSample);
Marshal.ThrowExceptionForHR(hr);
// Get the buffer from the sample interface. This is
// where we copy the bitmap data to
hr = pSample.GetBuffer(out ip);
Marshal.ThrowExceptionForHR(hr);
// Copy the bitmap data into the sample buffer
LoadSample(bmd, ip, iSize);
// Write the sample to the output - Sometimes, for reasons I can't explain,
// writing a sample fails. However, writing the same sample again
// works. Go figure.
int iRetry = 0;
do
{
hr = m_pWMWriter.WriteSample(m_dwVideoInput, 10000 * m_msVideoTime, WriteFlags.CleanPoint, pSample);
} while (hr == NSResults.E_InvalidData && iRetry++ < 3);
Marshal.ThrowExceptionForHR(hr);
// update the time based on the framerate
m_msVideoTime = (++m_dwCurrentVideoSample * 1000) / m_iFrameRate;
}
finally
{
// Release the locals
if (pSample != null)
{
Marshal.ReleaseComObject(pSample);
pSample = null;
}
hBitmap.UnlockBits(bmd);
}
}
private void TestBuffer()
{
IntPtr ip, ip2;
int l;
m_pSample.GetBuffer(out ip);
Debug.Assert(ip != IntPtr.Zero);
m_pSample.GetBufferAndLength(out ip2, out l);
Debug.Assert(ip == ip2);
Debug.Assert(l == 12);
}
public int Read(AudioBuffer buff, int maxLength)
{
buff.Prepare(this, maxLength);
int buff_offset = 0;
int buff_size = buff.ByteLength;
while (m_pSampleSize < buff_size)
{
if (m_pSampleSize > 0)
{
IntPtr pdwBuffer;
m_pSample.GetBuffer(out pdwBuffer);
Marshal.Copy((IntPtr)(pdwBuffer.ToInt64() + m_pSampleOffset), buff.Bytes, buff_offset, m_pSampleSize);
buff_size -= m_pSampleSize;
buff_offset += m_pSampleSize;
m_sampleOffset += m_pSampleSize;
m_pSampleSize = 0;
Marshal.ReleaseComObject(m_pSample);
m_pSample = null;
}
long cnsSampleTime;
long cnsDuration;
SampleFlag flags;
int dwOutputNum;
short wStreamNum;
try
{
m_syncReader.GetNextSample(m_wStreamNum, out m_pSample, out cnsSampleTime, out cnsDuration, out flags, out dwOutputNum, out wStreamNum);
}
catch (COMException ex)
{
// EOF
if (ex.ErrorCode == NSResults.E_NO_MORE_SAMPLES)
{
if ((m_sampleOffset % PCM.BlockAlign) != 0)
{
throw new Exception("(m_sampleOffset % PCM.BlockAlign) != 0");
}
m_sampleCount = m_sampleOffset / PCM.BlockAlign;
if ((buff_offset % PCM.BlockAlign) != 0)
{
throw new Exception("(buff_offset % PCM.BlockAlign) != 0");
}
return(buff.Length = buff_offset / PCM.BlockAlign);
}
throw ex;
}
//if (dwOutputNum != m_dwAudioOutputNum || wStreamNum != m_wStreamNum)
//{
//}
m_pSampleOffset = 0;
m_pSample.GetLength(out m_pSampleSize);
}
if (buff_size > 0)
{
IntPtr pdwBuffer;
m_pSample.GetBuffer(out pdwBuffer);
Marshal.Copy((IntPtr)(pdwBuffer.ToInt64() + m_pSampleOffset), buff.Bytes, buff_offset, buff_size);
m_pSampleOffset += buff_size;
m_pSampleSize -= buff_size;
m_sampleOffset += buff_size;
buff_offset += buff_size;
buff_size = 0;
}
if ((buff_offset % PCM.BlockAlign) != 0)
{
throw new Exception("(buff_offset % PCM.BlockAlign) != 0");
}
return(buff.Length = buff_offset / PCM.BlockAlign);
}
internal void AddFrame(WriteableBitmap bitmap)
{
INSSBuffer sampleBuffer = null;
if (BitmapBounds.Width != bitmap.Width)
{
Guid mediaSubType;
short bitCount;
BitmapBounds = new Rectangle(0, 0, (int)bitmap.Width, (int)bitmap.Height);
GetMediaType(bitmap.Format, out mediaSubType, out bitCount);
ConfigureMediaWriter(BitmapBounds.Width, BitmapBounds.Height, mediaSubType, bitCount);
MediaWriterConfigured = true;
if (!MediaWriterIsWriting)
{
MediaWriter.BeginWriting();
MediaWriterIsWriting = true;
}
}
try
{
// Compute size of bitmap in bytes. Strides may be negative.
int bitmapSize = Math.Abs(bitmap.BackBufferStride * (int)bitmap.Height);
IntPtr framePointer;
// Get a sample interface
MediaWriter.AllocateSample(bitmapSize, out sampleBuffer);
// Get the buffer from the sample interface. This is
// where we copy the bitmap data to
sampleBuffer.GetBuffer(out framePointer);
// Copy the bitmap data into the sample buffer
CopyFrame(bitmap.BackBuffer, framePointer, bitmapSize);
// Write the sample to the output - Sometimes, for reasons I can't explain,
// writing a sample fails. However, writing the same sample again
// works. Go figure.
int iRetry = 0;
do
{
try
{
MediaWriter.WriteSample(VideoChannelIndex, 10000 * CurrentSampleTimeStamp, SampleFlag.CleanPoint, sampleBuffer);
break;
}
catch (COMException e)
{
if ((iRetry++ < 3) && (e.ErrorCode != NSResults.E_INVALID_DATA))
{
continue;
}
else
{
throw;
}
}
} while (true);
// update the time based on the framerate
CurrentSampleTimeStamp = (++CurrentSampleIndex * 1000) / Constants.VideoFrameRate;
}
finally
{
// Release the locals
if (sampleBuffer != null)
{
Marshal.ReleaseComObject(sampleBuffer);
sampleBuffer = null;
}
}
}
