/////////////////////////////////////////////////////////////////////
// Name: CreateASFSplitter
//
// Creates the ASF splitter.
//
// pContentInfo: Pointer to an initialized instance of the ASF
// content information object.
// ppSplitter: Receives a pointer to the ASF splitter.
/////////////////////////////////////////////////////////////////////
void CreateASFSplitter(IMFASFContentInfo pContentInfo, out IMFASFSplitter ppSplitter)
{
MFASFSplitterFlags f;
HResult hr;
hr = MFExtern.MFCreateASFSplitter(out ppSplitter);
MFError.ThrowExceptionForHR(hr);
hr = ppSplitter.Initialize(pContentInfo);
MFError.ThrowExceptionForHR(hr);
hr = ppSplitter.GetFlags(out f);
MFError.ThrowExceptionForHR(hr);
Console.WriteLine(string.Format("Splitter flags: {0}", f));
}
public void DoSplit()
{
HResult hr;
bool bHasVideo = false;
IMFByteStream pStream = null;
IMFASFContentInfo pContentInfo = null;
IMFASFSplitter pSplitter = null;
Console.WriteLine(string.Format("Opening {0}.", m_sFileName));
try
{
// Start the Media Foundation platform.
hr = MFExtern.MFStartup(0x10070, MFStartup.Full);
MFError.ThrowExceptionForHR(hr);
// Open the file.
OpenFile(m_sFileName, out pStream);
// Read the ASF header.
CreateContentInfo(pStream, out pContentInfo);
// Create the ASF splitter.
CreateASFSplitter(pContentInfo, out pSplitter);
// Select the first video stream.
SelectVideoStream(pContentInfo, pSplitter, out bHasVideo);
// Parse the ASF file.
if (bHasVideo)
{
DisplayKeyFrames(pStream, pSplitter);
}
else
{
Console.WriteLine("No video stream.");
}
}
catch (Exception e)
{
hr = (HResult)Marshal.GetHRForException(e);
string s = MFError.GetErrorText(hr);
if (s == null)
{
s = e.Message;
}
else
{
s = string.Format("{0} ({1})", s, e.Message);
}
Console.WriteLine(string.Format("Exception 0x{0:x}: {1}", hr, s));
}
finally
{
// Clean up.
SafeRelease(pSplitter);
SafeRelease(pContentInfo);
SafeRelease(pStream);
}
// Shut down the Media Foundation platform.
hr = MFExtern.MFShutdown();
MFError.ThrowExceptionForHR(hr);
}
/////////////////////////////////////////////////////////////////////
// Name: DisplayKeyFrames
//
// Parses the video stream and displays information about the
// samples that contain key frames.
//
// pStream: Pointer to a byte stream. The byte stream's current
// read position must be at the start of the ASF Data
// Object.
// pSplitter: Pointer to the ASF splitter.
/////////////////////////////////////////////////////////////////////
void DisplayKeyFrames(
IMFByteStream pStream,
IMFASFSplitter pSplitter
)
{
const int cbReadSize = 2048; // Read size (arbitrary value)
int cbData; // Amount of data read
ASFStatusFlags dwStatus; // Parsing status
short wStreamID; // Stream identifier
bool bIsKeyFrame = false; // Is the sample a key frame?
int cBuffers; // Buffer count
int cbTotalLength; // Buffer length
long hnsTime; // Time stamp
HResult hr;
IMFMediaBuffer pBuffer;
IMFSample pSample;
while (true)
{
// Read data into the buffer.
ReadDataIntoBuffer(pStream, cbReadSize, out pBuffer);
try
{
hr = pBuffer.GetCurrentLength(out cbData);
MFError.ThrowExceptionForHR(hr);
if (cbData == 0)
{
break; // End of file.
}
// Send the data to the ASF splitter.
hr = pSplitter.ParseData(pBuffer, 0, 0);
MFError.ThrowExceptionForHR(hr);
// Pull samples from the splitter.
do
{
hr = pSplitter.GetNextSample(out dwStatus, out wStreamID, out pSample);
MFError.ThrowExceptionForHR(hr);
if (pSample == null)
{
// No samples yet. Parse more data.
break;
}
try
{
// We received a sample from the splitter. Check to see
// if it's a key frame. The default is FALSE.
try
{
int i;
hr = pSample.GetUINT32(MFAttributesClsid.MFSampleExtension_CleanPoint, out i);
MFError.ThrowExceptionForHR(hr);
bIsKeyFrame = i != 0;
}
catch
{
bIsKeyFrame = false;
}
if (bIsKeyFrame)
{
// Print various information about the key frame.
hr = pSample.GetBufferCount(out cBuffers);
MFError.ThrowExceptionForHR(hr);
hr = pSample.GetTotalLength(out cbTotalLength);
MFError.ThrowExceptionForHR(hr);
Console.WriteLine(string.Format("Buffer count: {0}", cBuffers));
Console.WriteLine(string.Format("Length: {0} bytes", cbTotalLength));
hr = pSample.GetSampleTime(out hnsTime);
MFError.ThrowExceptionForHR(hr);
// Convert the time stamp to seconds.
double sec = (double)(hnsTime / 10000) / 1000;
Console.WriteLine(string.Format("Time stamp: {0} sec.", sec));
}
}
finally
{
SafeRelease(pSample);
}
} while ((dwStatus & ASFStatusFlags.Incomplete) > 0);
}
finally
{
SafeRelease(pBuffer);
}
}
Console.WriteLine("Done");
}
/////////////////////////////////////////////////////////////////////
// Name: SelectVideoStream
//
// Selects the first video stream for parsing with the ASF splitter.
//
// pContentInfo: Pointer to an initialized instance of the ASF
// content information object.
// pSplitter: Pointer to the ASF splitter.
// pbHasVideo: Receives TRUE if there is a video stream, or FALSE
// otherwise.
/////////////////////////////////////////////////////////////////////
void SelectVideoStream(
IMFASFContentInfo pContentInfo,
IMFASFSplitter pSplitter,
out bool pbHasVideo
)
{
int cStreams;
short wStreamID = 33;
short[] wStreamIDs = new short[1];
Guid streamType;
bool bFoundVideo = false;
HResult hr;
IMFASFProfile pProfile;
IMFASFStreamConfig pStream;
// Get the ASF profile from the content information object.
hr = pContentInfo.GetProfile(out pProfile);
MFError.ThrowExceptionForHR(hr);
try
{
// Loop through all of the streams in the profile.
hr = pProfile.GetStreamCount(out cStreams);
MFError.ThrowExceptionForHR(hr);
for (int i = 0; i < cStreams; i++)
{
// Get the stream type and stream identifier.
hr = pProfile.GetStream(i, out wStreamID, out pStream);
MFError.ThrowExceptionForHR(hr);
try
{
hr = pStream.GetStreamType(out streamType);
MFError.ThrowExceptionForHR(hr);
if (streamType == MFMediaType.Video)
{
bFoundVideo = true;
break;
}
}
finally
{
SafeRelease(pStream);
}
}
}
finally
{
SafeRelease(pProfile);
}
// Select the video stream, if found.
if (bFoundVideo)
{
// SelectStreams takes an array of stream identifiers.
wStreamIDs[0] = wStreamID;
hr = pSplitter.SelectStreams(wStreamIDs, 1);
MFError.ThrowExceptionForHR(hr);
}
pbHasVideo = bFoundVideo;
}
public static extern void MFCreateASFSplitter(
out IMFASFSplitter ppISplitter);
/////////////////////////////////////////////////////////////////////
// Name: SelectVideoStream
//
// Selects the first video stream for parsing with the ASF splitter.
//
// pContentInfo: Pointer to an initialized instance of the ASF
// content information object.
// pSplitter: Pointer to the ASF splitter.
// pbHasVideo: Receives TRUE if there is a video stream, or FALSE
// otherwise.
/////////////////////////////////////////////////////////////////////
void SelectVideoStream(
IMFASFContentInfo pContentInfo,
IMFASFSplitter pSplitter,
out bool pbHasVideo
)
{
int cStreams;
short wStreamID = 33;
short[] wStreamIDs = new short[1];
Guid streamType;
bool bFoundVideo = false;
IMFASFProfile pProfile;
IMFASFStreamConfig pStream;
// Get the ASF profile from the content information object.
int hr = pContentInfo.GetProfile(out pProfile);
MFError.ThrowExceptionForHR(hr);
try
{
// Loop through all of the streams in the profile.
hr = pProfile.GetStreamCount(out cStreams);
MFError.ThrowExceptionForHR(hr);
for (int i = 0; i < cStreams; i++)
{
// Get the stream type and stream identifier.
hr = pProfile.GetStream(i, out wStreamID, out pStream);
MFError.ThrowExceptionForHR(hr);
try
{
hr = pStream.GetStreamType(out streamType);
MFError.ThrowExceptionForHR(hr);
if (streamType == MFMediaType.Video)
{
bFoundVideo = true;
break;
}
}
finally
{
SafeRelease(pStream);
}
}
}
finally
{
SafeRelease(pProfile);
}
// Select the video stream, if found.
if (bFoundVideo)
{
// SelectStreams takes an array of stream identifiers.
wStreamIDs[0] = wStreamID;
hr = pSplitter.SelectStreams(wStreamIDs, 1);
MFError.ThrowExceptionForHR(hr);
}
pbHasVideo = bFoundVideo;
}
/////////////////////////////////////////////////////////////////////
// Name: DisplayKeyFrames
//
// Parses the video stream and displays information about the
// samples that contain key frames.
//
// pStream: Pointer to a byte stream. The byte stream's current
// read position must be at the start of the ASF Data
// Object.
// pSplitter: Pointer to the ASF splitter.
/////////////////////////////////////////////////////////////////////
void DisplayKeyFrames(
IMFASFIndexer ai,
IMFByteStream pStream,
IMFASFSplitter pSplitter
)
{
const int cbReadSize = 2048; // Read size (arbitrary value)
int cbData; // Amount of data read
ASFStatusFlags dwStatus; // Parsing status
short wStreamID; // Stream identifier
bool bIsKeyFrame = false; // Is the sample a key frame?
int cBuffers; // Buffer count
int cbTotalLength; // Buffer length
long hnsTime; // Time stamp
IMFMediaBuffer pBuffer;
IMFSample pSample;
IMFByteStream[] aia = new IMFByteStream[1];
aia[0] = pStream;
int hr = ai.SetIndexByteStreams(aia, 1);
MFError.ThrowExceptionForHR(hr);
ASFIndexIdentifier ii = new ASFIndexIdentifier();
ii.guidIndexType = Guid.Empty;
ii.wStreamNumber = 2;
bool b;
int i1 = 100;
IntPtr ip = Marshal.AllocCoTaskMem(i1);
ai.GetIndexStatus(ii, out b, ip, ref i1);
long l;
PropVariant pv = new PropVariant(50000000L);
hr = ai.GetSeekPositionForValue(pv, ii, out l, IntPtr.Zero, out i1);
MFError.ThrowExceptionForHR(hr);
while (true)
{
// Read data into the buffer.
ReadDataIntoBuffer(pStream, cbReadSize, out pBuffer);
try
{
hr = pBuffer.GetCurrentLength(out cbData);
MFError.ThrowExceptionForHR(hr);
if (cbData == 0)
{
break; // End of file.
}
// Send the data to the ASF splitter.
hr = pSplitter.ParseData(pBuffer, 0, 0);
MFError.ThrowExceptionForHR(hr);
// Pull samples from the splitter.
do
{
hr = pSplitter.GetNextSample(out dwStatus, out wStreamID, out pSample);
MFError.ThrowExceptionForHR(hr);
if (pSample == null)
{
// No samples yet. Parse more data.
break;
}
try
{
// We received a sample from the splitter. Check to see
// if it's a key frame. The default is FALSE.
try
{
int i;
hr = pSample.GetUINT32(MFAttributesClsid.MFSampleExtension_CleanPoint, out i);
MFError.ThrowExceptionForHR(hr);
bIsKeyFrame = i != 0;
}
catch
{
bIsKeyFrame = false;
}
if (bIsKeyFrame)
{
// Print various information about the key frame.
hr = pSample.GetBufferCount(out cBuffers);
MFError.ThrowExceptionForHR(hr);
hr = pSample.GetTotalLength(out cbTotalLength);
MFError.ThrowExceptionForHR(hr);
Console.WriteLine(string.Format("Buffer count: {0}", cBuffers));
Console.WriteLine(string.Format("Length: {0} bytes", cbTotalLength));
hr = pSample.GetSampleTime(out hnsTime);
MFError.ThrowExceptionForHR(hr);
// Convert the time stamp to seconds.
double sec = (double)(hnsTime / 10000) / 1000;
Console.WriteLine(string.Format("Time stamp: {0} sec.", sec));
}
}
finally
{
SafeRelease(pSample);
}
} while ((dwStatus & ASFStatusFlags.Incomplete) > 0);
}
finally
{
SafeRelease(pBuffer);
}
}
Console.WriteLine("Done");
}
/////////////////////////////////////////////////////////////////////
// Name: CreateASFSplitter
//
// Creates the ASF splitter.
//
// pContentInfo: Pointer to an initialized instance of the ASF
// content information object.
// ppSplitter: Receives a pointer to the ASF splitter.
/////////////////////////////////////////////////////////////////////
void CreateASFSplitter(IMFASFContentInfo pContentInfo, out IMFASFSplitter ppSplitter)
{
MFASFSplitterFlags f;
int hr = MFExtern.MFCreateASFSplitter(out ppSplitter);
MFError.ThrowExceptionForHR(hr);
hr = ppSplitter.Initialize(pContentInfo);
MFError.ThrowExceptionForHR(hr);
hr = ppSplitter.GetFlags(out f);
MFError.ThrowExceptionForHR(hr);
Console.WriteLine(string.Format("Splitter flags: {0}", f));
}
/////////////////////////////////////////////////////////////////////
// Name: DisplayKeyFrames
//
// Parses the video stream and displays information about the
// samples that contain key frames.
//
// pStream: Pointer to a byte stream. The byte stream's current
// read position must be at the start of the ASF Data
// Object.
// pSplitter: Pointer to the ASF splitter.
/////////////////////////////////////////////////////////////////////
void DisplayKeyFrames(
IMFByteStream pStream,
IMFASFSplitter pSplitter
)
{
const int cbReadSize = 2048; // Read size (arbitrary value)
int cbData; // Amount of data read
ASFStatusFlags dwStatus; // Parsing status
short wStreamID; // Stream identifier
bool bIsKeyFrame = false; // Is the sample a key frame?
int cBuffers; // Buffer count
int cbTotalLength; // Buffer length
long hnsTime; // Time stamp
int hr;
IMFMediaBuffer pBuffer;
IMFSample pSample;
while (true)
{
// Read data into the buffer.
ReadDataIntoBuffer(pStream, cbReadSize, out pBuffer);
try
{
hr = pBuffer.GetCurrentLength(out cbData);
MFError.ThrowExceptionForHR(hr);
if (cbData == 0)
{
break; // End of file.
}
// Send the data to the ASF splitter.
hr = pSplitter.ParseData(pBuffer, 0, 0);
MFError.ThrowExceptionForHR(hr);
// Pull samples from the splitter.
do
{
hr = pSplitter.GetNextSample(out dwStatus, out wStreamID, out pSample);
MFError.ThrowExceptionForHR(hr);
if (pSample == null)
{
// No samples yet. Parse more data.
break;
}
try
{
// We received a sample from the splitter. Check to see
// if it's a key frame. The default is FALSE.
try
{
int i;
hr = pSample.GetUINT32(MFAttributesClsid.MFSampleExtension_CleanPoint, out i);
MFError.ThrowExceptionForHR(hr);
bIsKeyFrame = i != 0;
}
catch
{
bIsKeyFrame = false;
}
if (bIsKeyFrame)
{
// Print various information about the key frame.
hr = pSample.GetBufferCount(out cBuffers);
MFError.ThrowExceptionForHR(hr);
hr = pSample.GetTotalLength(out cbTotalLength);
MFError.ThrowExceptionForHR(hr);
Console.WriteLine(string.Format("Buffer count: {0}", cBuffers));
Console.WriteLine(string.Format("Length: {0} bytes", cbTotalLength));
hr = pSample.GetSampleTime(out hnsTime);
MFError.ThrowExceptionForHR(hr);
// Convert the time stamp to seconds.
double sec = (double)(hnsTime / 10000) / 1000;
Console.WriteLine(string.Format("Time stamp: {0} sec.", sec));
}
}
finally
{
SafeRelease(pSample);
}
} while ((dwStatus & ASFStatusFlags.Incomplete) > 0);
}
finally
{
SafeRelease(pBuffer);
}
}
Console.WriteLine("Done");
}
