protected void AddBranchToPartialTopology(IMFTopology pTopology, IMFPresentationDescriptor pSourcePD, int iStream)
{
int hr;
//TRACE("CPlayer::AddBranchToPartialTopology");
//Debug.Assert(pTopology != null);
IMFStreamDescriptor pSourceSD = null;
IMFTopologyNode pSourceNode = null;
IMFTopologyNode pOutputNode = null;
bool fSelected = false;
try
{
// Get the stream descriptor for this stream.
hr = pSourcePD.GetStreamDescriptorByIndex(iStream, out fSelected, out pSourceSD);
MFError.ThrowExceptionForHR(hr);
// Create the topology branch only if the stream is selected.
// Otherwise, do nothing.
if (fSelected)
{
// Create a source node for this stream.
pSourceNode = CreateSourceStreamNode(pSourcePD, pSourceSD);
// Add both nodes to the topology.
hr = pTopology.AddNode(pSourceNode);
MFError.ThrowExceptionForHR(hr);
// Create the output node for the renderer.
pOutputNode = CreateOutputNode(pSourceSD);
if (pOutputNode == null)
{
throw new Exception("Could not create output node");
}
hr = pTopology.AddNode(pOutputNode);
MFError.ThrowExceptionForHR(hr);
// Connect the source node to the output node.
hr = pSourceNode.ConnectOutput(0, pOutputNode, 0);
MFError.ThrowExceptionForHR(hr);
}
}
finally
{
// Clean up.
COMBase.SafeRelease(pSourceSD);
COMBase.SafeRelease(pSourceNode);
COMBase.SafeRelease(pOutputNode);
}
}
protected void AddBranchToPartialTopology(
IMFTopology pTopology,
IMFPresentationDescriptor pSourcePD,
int iStream
)
{
MFError throwonhr;
TRACE("CPlayer::AddBranchToPartialTopology");
Debug.Assert(pTopology != null);
IMFStreamDescriptor pSourceSD = null;
IMFTopologyNode pSourceNode = null;
IMFTopologyNode pOutputNode = null;
bool fSelected = false;
try
{
// Get the stream descriptor for this stream.
throwonhr = pSourcePD.GetStreamDescriptorByIndex(iStream, out fSelected, out pSourceSD);
// Create the topology branch only if the stream is selected.
// Otherwise, do nothing.
if (fSelected)
{
// Create a source node for this stream.
CreateSourceStreamNode(pSourcePD, pSourceSD, out pSourceNode);
// Create the output node for the renderer.
CreateOutputNode(pSourceSD, out pOutputNode);
// Add both nodes to the topology.
throwonhr = pTopology.AddNode(pSourceNode);
throwonhr = pTopology.AddNode(pOutputNode);
// Connect the source node to the output node.
throwonhr = pSourceNode.ConnectOutput(0, pOutputNode, 0);
}
}
finally
{
// Clean up.
SafeRelease(pSourceSD);
SafeRelease(pSourceNode);
SafeRelease(pOutputNode);
}
}
///////////////////////////////////////////////////////////////////////
// Name: CreateAudioBranch
// Description:
// Adds and connects the nodes downstream from an audio source node.
//
// pTopology: Pointer to the topology.
// pSourceNode: Pointer to the source node.
// clsidTransform: CLSID of an effect transform.
/////////////////////////////////////////////////////////////////////////
void CreateAudioBranch(
IMFTopology pTopology,
IMFTopologyNode pSourceNode,
Guid clsidTransform // GUID_NULL = No transform.
)
{
TRACE("CreateAudioBranch");
IMFTopologyNode pOutputNode = null;
IMFActivate pRendererActivate = null;
// Create a downstream node.
MFError throwonhr;
throwonhr = MFExtern.MFCreateTopologyNode(MFTopologyType.OutputNode, out pOutputNode);
try
{
// Create an IMFActivate object for the audio renderer.
throwonhr = MFExtern.MFCreateAudioRendererActivate(out pRendererActivate);
// Set the IActivate object on the output node.
throwonhr = pOutputNode.SetObject(pRendererActivate);
// Add the output node to the topology.
throwonhr = pTopology.AddNode(pOutputNode);
ConnectSourceToOutput(pTopology, pSourceNode, pOutputNode, clsidTransform);
}
finally
{
// Connect the source to the output.
SafeRelease(pOutputNode);
SafeRelease(pRendererActivate);
}
}
///////////////////////////////////////////////////////////////////////
// Name: ConnectSourceToOutput
// Description:
// Connects the source node to the output node.
//
// pTopology: Pointer to the topology.
// pSourceNode: Pointer to the source node.
// pOutputNode: Pointer to the output node.
// clsidTransform: CLSID of an effect transform.
/////////////////////////////////////////////////////////////////////////
void ConnectSourceToOutput(
IMFTopology pTopology,
IMFTopologyNode pSourceNode,
IMFTopologyNode pOutputNode,
Guid clsidTransform
)
{
HResult hr;
if (clsidTransform == Guid.Empty)
{
// There is no effect specified, so connect the source node
// directly to the output node.
hr = pSourceNode.ConnectOutput(0, pOutputNode, 0);
MFError.ThrowExceptionForHR(hr);
}
else
{
IMFTopologyNode pTransformNode = null;
object pTransformUnk = null;
// Create a transform node.
hr = MFExtern.MFCreateTopologyNode(MFTopologyType.TransformNode, out pTransformNode);
MFError.ThrowExceptionForHR(hr);
try
{
Type type = Type.GetTypeFromCLSID(clsidTransform);
pTransformUnk = Activator.CreateInstance(type);
hr = pTransformNode.SetObject(pTransformUnk);
MFError.ThrowExceptionForHR(hr);
//// Set the CLSID of the transform.
//if (SUCCEEDED(hr))
//{
// hr = pTransformNode->SetGUID(MF_TOPONODE_TRANSFORM_OBJECTID, clsidTransform);
//}
// Add the transform node to the topology.
hr = pTopology.AddNode(pTransformNode);
MFError.ThrowExceptionForHR(hr);
// Connect the source node to the transform node.
hr = pSourceNode.ConnectOutput(0, pTransformNode, 0);
MFError.ThrowExceptionForHR(hr);
// Connect the transform node to the output node.
hr = pTransformNode.ConnectOutput(0, pOutputNode, 0);
MFError.ThrowExceptionForHR(hr);
}
finally
{
SafeRelease(pTransformNode);
//SafeRelease(pTransformUnk);
}
}
}
///////////////////////////////////////////////////////////////////////
// Name: CreateTopologyBranch
// Description: Adds a source and sink to the topology and
// connects them.
//
// pTopology: The topology.
// pSource: The media source.
// pPD: The source's presentation descriptor.
// pSD: The stream descriptor for the stream.
// pSink: The media sink.
//
///////////////////////////////////////////////////////////////////////
static void CreateTopologyBranch(
IMFTopology pTopology,
IMFMediaSource pSource, // Media source.
IMFPresentationDescriptor pPD, // Presentation descriptor.
IMFStreamDescriptor pSD, // Stream descriptor.
IMFMediaSinkAlt pSink
)
{
HResult hr;
IMFTopologyNode pSourceNode = null;
IMFTopologyNode pOutputNode = null;
CreateSourceNode(pSource, pPD, pSD, out pSourceNode);
try
{
CreateOutputNode(pSink, 0, out pOutputNode);
try
{
hr = pTopology.AddNode(pSourceNode);
MFError.ThrowExceptionForHR(hr);
hr = pTopology.AddNode(pOutputNode);
MFError.ThrowExceptionForHR(hr);
hr = pSourceNode.ConnectOutput(0, pOutputNode, 0);
MFError.ThrowExceptionForHR(hr);
}
finally
{
if (pOutputNode != null)
{
Marshal.ReleaseComObject(pOutputNode);
}
}
}
finally
{
if (pSourceNode != null)
{
Marshal.ReleaseComObject(pSourceNode);
}
}
}
///////////////////////////////////////////////////////////////////////
// Name: AddBranchToPartialTopology
// Description: Adds a topology branch for one stream.
//
// pTopology: Pointer to the topology object.
// hVideoWindow: Handle to the video window (for video streams).
// pSource: Media source.
// pSourcePD: The source's presentation descriptor.
// iStream: Index of the stream to render.
//
// Pre-conditions: The topology must be created already.
//
// Notes: For each stream, we must do the following:
// 1. Create a source node associated with the stream.
// 2. Create an output node for the renderer.
// 3. Connect the two nodes.
//
// Optionally we can also add an effect transform between the source
// and output nodes.
//
// The media session will resolve the topology, so we do not have
// to worry about decoders or color converters.
/////////////////////////////////////////////////////////////////////////
void AddBranchToPartialTopology(
IMFTopology pTopology,
IntPtr hVideoWindow,
IMFMediaSource pSource,
IMFPresentationDescriptor pSourcePD,
int iStream)
{
TRACE("Player::RenderStream");
IMFStreamDescriptor pSourceSD = null;
IMFTopologyNode pSourceNode = null;
MFError throwonhr;
Guid majorType;
bool fSelected = false;
// Get the stream descriptor for this stream.
throwonhr = pSourcePD.GetStreamDescriptorByIndex(iStream, out fSelected, out pSourceSD);
// First check if the stream is selected by default. If not, ignore it.
// More sophisticated applications can change the default selections.
if (fSelected)
{
try
{
// Create a source node for this stream.
CreateSourceStreamNode(pSource, pSourcePD, pSourceSD, out pSourceNode);
// Add the source node to the topology.
throwonhr = pTopology.AddNode(pSourceNode);
// Get the major media type for the stream.
GetStreamType(pSourceSD, out majorType);
if (majorType == MFMediaType.Video)
{
// For video, use the grayscale transform.
CreateVideoBranch(pTopology, pSourceNode, hVideoWindow, m_VideoEffect);
}
else if (majorType == MFMediaType.Audio)
{
if (!m_Audio)
{
CreateAudioBranch(pTopology, pSourceNode, m_AudioEffect);
}
}
}
finally
{
// Clean up.
SafeRelease(pSourceSD);
SafeRelease(pSourceNode);
}
}
}
///////////////////////////////////////////////////////////////////////
// Name: ConnectSourceToOutput
// Description:
// Connects the source node to the output node.
//
// pTopology: Pointer to the topology.
// pSourceNode: Pointer to the source node.
// pOutputNode: Pointer to the output node.
// clsidTransform: CLSID of an effect transform.
/////////////////////////////////////////////////////////////////////////
void ConnectSourceToOutput(
IMFTopology pTopology,
IMFTopologyNode pSourceNode,
IMFTopologyNode pOutputNode,
Guid clsidTransform
)
{
MFError throwonhr;
if (clsidTransform == Guid.Empty)
{
// There is no effect specified, so connect the source node
// directly to the output node.
throwonhr = pSourceNode.ConnectOutput(0, pOutputNode, 0);
}
else
{
IMFTopologyNode pTransformNode = null;
// Create a transform node.
throwonhr = MFExtern.MFCreateTopologyNode(MFTopologyType.TransformNode, out pTransformNode);
if (clsidTransform == m_VideoEffect)
{
m_VideoNode = pTransformNode;
}
else if (clsidTransform == m_AudioEffect)
{
m_AudioNode = pTransformNode;
}
try
{
// Set the CLSID of the transform.
throwonhr = pTransformNode.SetGUID(MFAttributesClsid.MF_TOPONODE_TRANSFORM_OBJECTID, clsidTransform);
// Add the transform node to the topology.
throwonhr = pTopology.AddNode(pTransformNode);
// Connect the source node to the transform node.
throwonhr = pSourceNode.ConnectOutput(0, pTransformNode, 0);
// Connect the transform node to the output node.
throwonhr = pTransformNode.ConnectOutput(0, pOutputNode, 0);
}
finally
{
//SafeRelease(pTransformNode);
}
}
}
///////////////////////////////////////////////////////////////////////
// Name: CreateVideoBranch
// Description:
// Adds and connects the nodes downstream from a video source node.
//
// pTopology: Pointer to the topology.
// pSourceNode: Pointer to the source node.
// hVideoWindow: Handle to the video window.
// clsidTransform: CLSID of an effect transform.
/////////////////////////////////////////////////////////////////////////
void CreateVideoBranch(
IMFTopology pTopology,
IMFTopologyNode pSourceNode,
IntPtr hVideoWindow,
Guid clsidTransform // GUID_NULL = No effect transform.
)
{
TRACE("CreateVideoBranch");
IMFTopologyNode pOutputNode = null;
IMFActivate pRendererActivate = null;
// Create a downstream node.
HResult hr = MFExtern.MFCreateTopologyNode(MFTopologyType.OutputNode, out pOutputNode);
MFError.ThrowExceptionForHR(hr);
try
{
// Create an IMFActivate object for the video renderer.
hr = MFExtern.MFCreateVideoRendererActivate(hVideoWindow, out pRendererActivate);
MFError.ThrowExceptionForHR(hr);
// Set the IActivate object on the output node.
hr = pOutputNode.SetObject(pRendererActivate);
MFError.ThrowExceptionForHR(hr);
// Add the output node to the topology.
hr = pTopology.AddNode(pOutputNode);
MFError.ThrowExceptionForHR(hr);
// Connect the source to the output.
ConnectSourceToOutput(pTopology, pSourceNode, pOutputNode, clsidTransform);
}
finally
{
SafeRelease(pOutputNode);
SafeRelease(pRendererActivate);
}
}
////////////////////////////////////////////////////////////////////////////////////////
// Name: CPlayer::CreateNodesForStream (Private)
// Description:
// Creates the source and output nodes for a stream and
// Adds them to the topology
// Connects the source node to the output node
//
// Parameter:
// pPresentationDescriptor: [in] Pointer to the presentation descriptor for the media source
// pMediaSource: [in] Pointer to the media source
// pTopology: [in] Pointer to the topology
//
// Notes: For each stream, the app must:
// 1. Create a source node associated with the stream.
// 2. Create an output node for the renderer.
// 3. Connect the two nodes.
// The media session will resolve the topology, transform nodes are not required
/////////////////////////////////////////////////////////////////////////////////////////
private void CreateNodesForStream(
IMFPresentationDescriptor pPresentationDescriptor,
IMFMediaSource pMediaSource,
IMFTopology pTopology)
{
if (pPresentationDescriptor == null || pMediaSource == null || pTopology == null)
{
throw new COMException("null pointer", E_Pointer);
}
int hr;
IMFStreamDescriptor pStreamDescriptor;
IMFTopologyNode pSourceNode;
IMFTopologyNode pOutputNode;
bool fSelected = false;
// Get the stream descriptor for the only stream index =0.
hr = pPresentationDescriptor.GetStreamDescriptorByIndex(0, out fSelected, out pStreamDescriptor);
MFError.ThrowExceptionForHR(hr);
try
{
if (fSelected)
{
// Create a source node for this stream and add it to the topology.
CreateSourceNode(pPresentationDescriptor, pStreamDescriptor, pMediaSource, out pSourceNode);
try
{
hr = pTopology.AddNode(pSourceNode);
MFError.ThrowExceptionForHR(hr);
// Create the output node for the renderer and add it to the topology.
CreateOutputNode(pStreamDescriptor, out pOutputNode);
try
{
hr = pTopology.AddNode(pOutputNode);
MFError.ThrowExceptionForHR(hr);
// Connect the source node to the output node.
hr = pSourceNode.ConnectOutput(0, pOutputNode, 0);
MFError.ThrowExceptionForHR(hr);
}
finally
{
SafeRelease(pOutputNode);
}
}
finally
{
SafeRelease(pSourceNode);
}
}
}
finally
{
//clean up
SafeRelease(pStreamDescriptor);
}
}
protected void AddBranchToPartialTopology(
IMFTopology pTopology,
IMFPresentationDescriptor pSourcePD,
int iStream
)
{
TRACE("CPlayer::AddBranchToPartialTopology");
Debug.Assert(pTopology != null);
IMFStreamDescriptor pSourceSD = null;
IMFTopologyNode pSourceNode = null;
IMFTopologyNode pOutputNode = null;
bool fSelected = false;
try
{
// Get the stream descriptor for this stream.
pSourcePD.GetStreamDescriptorByIndex(iStream, out fSelected, out pSourceSD);
// Create the topology branch only if the stream is selected.
// Otherwise, do nothing.
if (fSelected)
{
// Create a source node for this stream.
CreateSourceStreamNode(pSourcePD, pSourceSD, out pSourceNode);
// Create the output node for the renderer.
CreateOutputNode(pSourceSD, out pOutputNode);
// Add both nodes to the topology.
pTopology.AddNode(pSourceNode);
pTopology.AddNode(pOutputNode);
// Connect the source node to the output node.
pSourceNode.ConnectOutput(0, pOutputNode, 0);
}
}
finally
{
// Clean up.
SafeRelease(pSourceSD);
SafeRelease(pSourceNode);
SafeRelease(pOutputNode);
}
}
///////////////////////////////////////////////////////////////////////
// Name: AddBranchToPartialTopology
// Description: Adds a topology branch for one stream.
//
// pTopology: Pointer to the topology object.
// hVideoWindow: Handle to the video window (for video streams).
// pSource: Media source.
// pSourcePD: The source's presentation descriptor.
// iStream: Index of the stream to render.
//
// Pre-conditions: The topology must be created already.
//
// Notes: For each stream, we must do the following:
// 1. Create a source node associated with the stream.
// 2. Create an output node for the renderer.
// 3. Connect the two nodes.
//
// Optionally we can also add an effect transform between the source
// and output nodes.
//
// The media session will resolve the topology, so we do not have
// to worry about decoders or color converters.
/////////////////////////////////////////////////////////////////////////
void AddBranchToPartialTopology(
IMFTopology pTopology,
IntPtr hVideoWindow,
IMFMediaSource pSource,
IMFPresentationDescriptor pSourcePD,
int iStream)
{
TRACE("Player::RenderStream");
IMFStreamDescriptor pSourceSD = null;
IMFTopologyNode pSourceNode = null;
int hr;
Guid majorType;
bool fSelected = false;
// Get the stream descriptor for this stream.
hr = pSourcePD.GetStreamDescriptorByIndex(iStream, out fSelected, out pSourceSD);
MFError.ThrowExceptionForHR(hr);
// First check if the stream is selected by default. If not, ignore it.
// More sophisticated applications can change the default selections.
if (fSelected)
{
try
{
// Create a source node for this stream.
CreateSourceStreamNode(pSource, pSourcePD, pSourceSD, out pSourceNode);
// Add the source node to the topology.
hr = pTopology.AddNode(pSourceNode);
MFError.ThrowExceptionForHR(hr);
// Get the major media type for the stream.
GetStreamType(pSourceSD, out majorType);
if (majorType == MFMediaType.Video)
{
// For video, use the grayscale transform.
CreateVideoBranch(pTopology, pSourceNode, hVideoWindow, m_VideoEffect);
}
else if (majorType == MFMediaType.Audio)
{
CreateAudioBranch(pTopology, pSourceNode, Guid.Empty);
}
}
finally
{
// Clean up.
SafeRelease(pSourceSD);
SafeRelease(pSourceNode);
}
}
}
///////////////////////////////////////////////////////////////////////
// Name: CreateVideoBranch
// Description:
// Adds and connects the nodes downstream from a video source node.
//
// pTopology: Pointer to the topology.
// pSourceNode: Pointer to the source node.
// hVideoWindow: Handle to the video window.
// clsidTransform: CLSID of an effect transform.
/////////////////////////////////////////////////////////////////////////
void CreateVideoBranch(
IMFTopology pTopology,
IMFTopologyNode pSourceNode,
IntPtr hVideoWindow,
Guid clsidTransform // GUID_NULL = No effect transform.
)
{
TRACE("CreateVideoBranch");
IMFTopologyNode pOutputNode = null;
IMFActivate pRendererActivate = null;
// Create a downstream node.
int hr = MFExtern.MFCreateTopologyNode(MFTopologyType.OutputNode, out pOutputNode);
MFError.ThrowExceptionForHR(hr);
try
{
// Create an IMFActivate object for the video renderer.
hr = MFExtern.MFCreateVideoRendererActivate(hVideoWindow, out pRendererActivate);
MFError.ThrowExceptionForHR(hr);
// Set the IActivate object on the output node.
hr = pOutputNode.SetObject(pRendererActivate);
MFError.ThrowExceptionForHR(hr);
// Add the output node to the topology.
hr = pTopology.AddNode(pOutputNode);
MFError.ThrowExceptionForHR(hr);
// Connect the source to the output.
ConnectSourceToOutput(pTopology, pSourceNode, pOutputNode, clsidTransform);
}
finally
{
SafeRelease(pOutputNode);
SafeRelease(pRendererActivate);
}
}
///////////////////////////////////////////////////////////////////////
// Name: ConnectSourceToOutput
// Description:
// Connects the source node to the output node.
//
// pTopology: Pointer to the topology.
// pSourceNode: Pointer to the source node.
// pOutputNode: Pointer to the output node.
// clsidTransform: CLSID of an effect transform.
/////////////////////////////////////////////////////////////////////////
void ConnectSourceToOutput(
IMFTopology pTopology,
IMFTopologyNode pSourceNode,
IMFTopologyNode pOutputNode,
Guid clsidTransform
)
{
int hr;
if (clsidTransform == Guid.Empty)
{
// There is no effect specified, so connect the source node
// directly to the output node.
hr = pSourceNode.ConnectOutput(0, pOutputNode, 0);
MFError.ThrowExceptionForHR(hr);
}
else
{
IMFTopologyNode pTransformNode = null;
object pTransformUnk = null;
// Create a transform node.
hr = MFExtern.MFCreateTopologyNode(MFTopologyType.TransformNode, out pTransformNode);
MFError.ThrowExceptionForHR(hr);
try
{
Type type = Type.GetTypeFromCLSID(clsidTransform);
pTransformUnk = Activator.CreateInstance(type);
hr = pTransformNode.SetObject(pTransformUnk);
MFError.ThrowExceptionForHR(hr);
//// Set the CLSID of the transform.
//if (SUCCEEDED(hr))
//{
// hr = pTransformNode->SetGUID(MF_TOPONODE_TRANSFORM_OBJECTID, clsidTransform);
//}
// Add the transform node to the topology.
hr = pTopology.AddNode(pTransformNode);
MFError.ThrowExceptionForHR(hr);
// Connect the source node to the transform node.
hr = pSourceNode.ConnectOutput(0, pTransformNode, 0);
MFError.ThrowExceptionForHR(hr);
// Connect the transform node to the output node.
hr = pTransformNode.ConnectOutput(0, pOutputNode, 0);
MFError.ThrowExceptionForHR(hr);
}
finally
{
SafeRelease(pTransformNode);
//SafeRelease(pTransformUnk);
}
}
}
////////////////////////////////////////////////////////////////////////////////////////
// Name: CPlayer::CreateNodesForStream (Private)
// Description:
// Creates the source and output nodes for a stream and
// Adds them to the topology
// Connects the source node to the output node
//
// Parameter:
// pPresentationDescriptor: [in] Pointer to the presentation descriptor for the media source
// pMediaSource: [in] Pointer to the media source
// pTopology: [in] Pointer to the topology
//
// Notes: For each stream, the app must:
// 1. Create a source node associated with the stream.
// 2. Create an output node for the renderer.
// 3. Connect the two nodes.
// The media session will resolve the topology, transform nodes are not required
/////////////////////////////////////////////////////////////////////////////////////////
private void CreateNodesForStream(
IMFPresentationDescriptor pPresentationDescriptor,
IMFMediaSource pMediaSource,
IMFTopology pTopology)
{
if (pPresentationDescriptor == null || pMediaSource == null || pTopology == null)
{
throw new COMException("null pointer", (int)HResult.E_POINTER);
}
HResult hr;
IMFStreamDescriptor pStreamDescriptor;
IMFTopologyNode pSourceNode;
IMFTopologyNode pOutputNode;
bool fSelected = false;
// Get the stream descriptor for the only stream index =0.
hr = pPresentationDescriptor.GetStreamDescriptorByIndex(0, out fSelected, out pStreamDescriptor);
MFError.ThrowExceptionForHR(hr);
try
{
if (fSelected)
{
// Create a source node for this stream and add it to the topology.
CreateSourceNode(pPresentationDescriptor, pStreamDescriptor, pMediaSource, out pSourceNode);
try
{
hr = pTopology.AddNode(pSourceNode);
MFError.ThrowExceptionForHR(hr);
// Create the output node for the renderer and add it to the topology.
CreateOutputNode(pStreamDescriptor, out pOutputNode);
try
{
hr = pTopology.AddNode(pOutputNode);
MFError.ThrowExceptionForHR(hr);
// Connect the source node to the output node.
hr = pSourceNode.ConnectOutput(0, pOutputNode, 0);
MFError.ThrowExceptionForHR(hr);
}
finally
{
SafeRelease(pOutputNode);
}
}
finally
{
SafeRelease(pSourceNode);
}
}
}
finally
{
//clean up
SafeRelease(pStreamDescriptor);
}
}
/// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
/// <summary>
/// Opens prepares the media session and topology and opens the media source
/// and media sink.
///
/// Once the session and topology are setup, a MESessionTopologySet event
/// will be triggered in the callback handler. After that the events there
/// trigger other events and everything rolls along automatically.
/// </summary>
/// <param name="sourceFileName">the source file name</param>
/// <param name="outputFileName">the name of the output file</param>
/// <history>
/// 01 Nov 18 Cynic - Originally Written
/// </history>
public void PrepareSessionAndTopology(string sourceFileName, string outputFileName)
{
HResult hr;
IMFSourceResolver pSourceResolver = null;
IMFTopology pTopology = null;
IMFPresentationDescriptor sourcePresentationDescriptor = null;
int sourceStreamCount = 0;
IMFStreamDescriptor audioStreamDescriptor = null;
bool streamIsSelected = false;
IMFTopologyNode sourceAudioNode = null;
IMFTopologyNode outputSinkNode = null;
IMFMediaType currentAudioMediaType = null;
int audioStreamIndex = -1;
LogMessage("PrepareSessionAndTopology ");
// we sanity check the filenames - the existence of the path and if the file already exists
// should have been checked before this call
if ((sourceFileName == null) || (sourceFileName.Length == 0))
{
throw new Exception("PrepareSessionAndTopology: source file name is invalid. Cannot continue.");
}
if ((outputFileName == null) || (outputFileName.Length == 0))
{
throw new Exception("PrepareSessionAndTopology: output file name is invalid. Cannot continue.");
}
try
{
// reset everything
CloseAllMediaDevices();
// Create the media session.
hr = MFExtern.MFCreateMediaSession(null, out mediaSession);
if (hr != HResult.S_OK)
{
throw new Exception("PrepareSessionAndTopology call to MFExtern.MFCreateMediaSession failed. Err=" + hr.ToString());
}
if (mediaSession == null)
{
throw new Exception("PrepareSessionAndTopology call to MFExtern.MFCreateMediaSession failed. mediaSession == null");
}
// set up our media session call back handler.
mediaSessionAsyncCallbackHandler = new TantaAsyncCallbackHandler();
mediaSessionAsyncCallbackHandler.Initialize();
mediaSessionAsyncCallbackHandler.MediaSession = mediaSession;
mediaSessionAsyncCallbackHandler.MediaSessionAsyncCallBackError = HandleMediaSessionAsyncCallBackErrors;
mediaSessionAsyncCallbackHandler.MediaSessionAsyncCallBackEvent = HandleMediaSessionAsyncCallBackEvent;
// Register the callback handler with the session and tell it that events can
// start. This does not actually trigger an event it just lets the media session
// know that it can now send them if it wishes to do so.
hr = mediaSession.BeginGetEvent(mediaSessionAsyncCallbackHandler, null);
if (hr != HResult.S_OK)
{
throw new Exception("PrepareSessionAndTopology call to mediaSession.BeginGetEvent failed. Err=" + hr.ToString());
}
// Create a new topology. A topology describes a collection of media sources, sinks, and transforms that are
// connected in a certain order. These objects are represented within the topology by topology nodes,
// which expose the IMFTopologyNode interface. A topology describes the path of multimedia data through these nodes.
hr = MFExtern.MFCreateTopology(out pTopology);
if (hr != HResult.S_OK)
{
throw new Exception("PrepareSessionAndTopology call to MFExtern.MFCreateTopology failed. Err=" + hr.ToString());
}
if (pTopology == null)
{
throw new Exception("PrepareSessionAndTopology call to MFExtern.MFCreateTopology failed. pTopology == null");
}
// ####
// #### we now create the media source, this is an audio file
// ####
// use the file name to create the media source for the audio device. Media sources are objects that generate media data.
// For example, the data might come from a video file, a network stream, or a hardware device, such as a camera. Each
// media source contains one or more streams, and each stream delivers data of one type, such as audio or video.
mediaSource = TantaWMFUtils.GetMediaSourceFromFile(sourceFileName);
if (mediaSource == null)
{
throw new Exception("PrepareSessionAndTopology call to mediaSource == null");
}
// A presentation is a set of related media streams that share a common presentation time. We now get a copy of the media
// source's presentation descriptor. Applications can use the presentation descriptor to select streams
// and to get information about the source content.
hr = mediaSource.CreatePresentationDescriptor(out sourcePresentationDescriptor);
if (hr != HResult.S_OK)
{
throw new Exception("PrepareSessionAndTopology call to mediaSource.CreatePresentationDescriptor failed. Err=" + hr.ToString());
}
if (sourcePresentationDescriptor == null)
{
throw new Exception("PrepareSessionAndTopology call to mediaSource.CreatePresentationDescriptor failed. sourcePresentationDescriptor == null");
}
// Now we get the number of stream descriptors in the presentation. A presentation descriptor contains a list of one or more
// stream descriptors. These describe the streams in the presentation. Streams can be either selected or deselected. Only the
// selected streams produce data. Deselected streams are not active and do not produce any data.
hr = sourcePresentationDescriptor.GetStreamDescriptorCount(out sourceStreamCount);
if (hr != HResult.S_OK)
{
throw new Exception("PrepareSessionAndTopology call to sourcePresentationDescriptor.GetStreamDescriptorCount failed. Err=" + hr.ToString());
}
if (sourceStreamCount == 0)
{
throw new Exception("PrepareSessionAndTopology call to sourcePresentationDescriptor.GetStreamDescriptorCount failed. sourceStreamCount == 0");
}
// Look at each stream, there can be more than one stream here
// Usually only one is enabled. This app uses the first "selected"
// stream we come to which has the appropriate media type
for (int i = 0; i < sourceStreamCount; i++)
{
// we require the major type to be audio
Guid guidMajorType = TantaWMFUtils.GetMajorMediaTypeFromPresentationDescriptor(sourcePresentationDescriptor, i);
if (guidMajorType != MFMediaType.Audio)
{
continue;
}
// we also require the stream to be enabled
hr = sourcePresentationDescriptor.GetStreamDescriptorByIndex(i, out streamIsSelected, out audioStreamDescriptor);
if (hr != HResult.S_OK)
{
throw new Exception("PrepareSessionAndTopology call to sourcePresentationDescriptor.GetStreamDescriptorByIndex failed. Err=" + hr.ToString());
}
if (audioStreamDescriptor == null)
{
throw new Exception("PrepareSessionAndTopology call to sourcePresentationDescriptor.GetStreamDescriptorByIndex failed. audioStreamDescriptor == null");
}
// if the stream is selected, leave now we will release the audioStream descriptor later
if (streamIsSelected == true)
{
audioStreamIndex = i; // record this
break;
}
// release the one we are not using
if (audioStreamDescriptor != null)
{
Marshal.ReleaseComObject(audioStreamDescriptor);
audioStreamDescriptor = null;
}
audioStreamIndex = -1;
}
// by the time we get here we should have a audioStreamDescriptor if
// we do not, then we cannot proceed
if (audioStreamDescriptor == null)
{
throw new Exception("PrepareSessionAndTopology call to sourcePresentationDescriptor.GetStreamDescriptorByIndex failed. audioStreamDescriptor == null");
}
if (audioStreamIndex < 0)
{
throw new Exception("PrepareSessionAndTopology call to sourcePresentationDescriptor.GetStreamDescriptorByIndex failed. audioStreamIndex < 0");
}
// ####
// #### we now create the media sink, we need the type from the stream to do
// #### this which is why we wait until now to set it up
// ####
currentAudioMediaType = TantaWMFUtils.GetCurrentMediaTypeFromStreamDescriptor(audioStreamDescriptor);
if (currentAudioMediaType == null)
{
throw new Exception("PrepareSessionAndTopology call to currentAudioMediaType == null");
}
mediaSink = OpenMediaFileSink(outputFileName);
if (mediaSink == null)
{
throw new Exception("PrepareSessionAndTopology call to mediaSink == null");
}
// ####
// #### we now make up a topology branch for the audio stream
// ####
// Create a source node for this stream.
sourceAudioNode = TantaWMFUtils.CreateSourceNodeForStream(mediaSource, sourcePresentationDescriptor, audioStreamDescriptor);
if (sourceAudioNode == null)
{
throw new Exception("PrepareSessionAndTopology call to CreateSourceNodeForStream failed. pSourceNode == null");
}
// Create the output node - this is a file sink in this case.
outputSinkNode = TantaWMFUtils.CreateSinkNodeForStream(mediaSink);
if (outputSinkNode == null)
{
throw new Exception("PrepareSessionAndTopology call to CreateOutputNodeForStream failed. outputSinkNode == null");
}
// Add the nodes to the topology. First the source
hr = pTopology.AddNode(sourceAudioNode);
if (hr != HResult.S_OK)
{
throw new Exception("PrepareSessionAndTopology call to pTopology.AddNode(sourceAudioNode) failed. Err=" + hr.ToString());
}
// then add the output
hr = pTopology.AddNode(outputSinkNode);
if (hr != HResult.S_OK)
{
throw new Exception("PrepareSessionAndTopology call to pTopology.AddNode(outputSinkNode) failed. Err=" + hr.ToString());
}
// Connect the output stream from the source node to the input stream of the output node. The parameters are:
// dwOutputIndex - Zero-based index of the output stream on this node.
// *pDownstreamNode - Pointer to the IMFTopologyNode interface of the node to connect to.
// dwInputIndexOnDownstreamNode - Zero-based index of the input stream on the other node.
hr = sourceAudioNode.ConnectOutput(0, outputSinkNode, 0);
if (hr != HResult.S_OK)
{
throw new Exception("PrepareSessionAndTopology call to pSourceNode.ConnectOutput failed. Err=" + hr.ToString());
}
// Set the topology on the media session.
// If SetTopology succeeds, the media session will queue an
// MESessionTopologySet event.
hr = mediaSession.SetTopology(0, pTopology);
MFError.ThrowExceptionForHR(hr);
// Release the topology
if (pTopology != null)
{
Marshal.ReleaseComObject(pTopology);
}
}
catch (Exception ex)
{
LogMessage("Error: " + ex.Message);
OISMessageBox(ex.Message);
}
finally
{
// Clean up
if (pSourceResolver != null)
{
Marshal.ReleaseComObject(pSourceResolver);
}
if (sourcePresentationDescriptor != null)
{
Marshal.ReleaseComObject(sourcePresentationDescriptor);
}
if (audioStreamDescriptor != null)
{
Marshal.ReleaseComObject(audioStreamDescriptor);
}
if (sourceAudioNode != null)
{
Marshal.ReleaseComObject(sourceAudioNode);
}
if (outputSinkNode != null)
{
Marshal.ReleaseComObject(outputSinkNode);
}
if (currentAudioMediaType != null)
{
Marshal.ReleaseComObject(currentAudioMediaType);
}
}
}
private static HResult BuildTopology(out IMFMediaSinkAlt mediaSink, IMFTopology topology, IMFPresentationDescriptor presentationDescriptor, IMFMediaSource source)
{
HResult hr = S_OK;
mediaSink = null;
IMFMediaSinkAlt tempMediaSink = null;
IMFStreamDescriptor streamDescriptor = null;
IMFTopologyNode sourceNode = null;
IMFTopologyNode outputNode = null;
bool selected = false;
int streamCount = 0;
hr = presentationDescriptor.GetStreamDescriptorCount(out streamCount);
if (Failed(hr))
{
return(hr);
}
for (int i = 0; i < streamCount; i++)
{
hr = presentationDescriptor.GetStreamDescriptorByIndex(i, out selected, out streamDescriptor);
if (Failed(hr))
{
return(hr);
}
if (selected)
{
hr = CreateSourceStreamNode(source, streamDescriptor, presentationDescriptor, out sourceNode);
if (Failed(hr))
{
return(hr);
}
hr = CreateOutputNode(streamDescriptor, out tempMediaSink, out outputNode);
if (Failed(hr))
{
mediaSink = null;
return(hr);
}
if (tempMediaSink != null)
{
mediaSink = tempMediaSink;
}
hr = topology.AddNode(sourceNode);
if (Failed(hr))
{
mediaSink = null;
return(hr);
}
hr = topology.AddNode(outputNode);
if (Failed(hr))
{
mediaSink = null;
return(hr);
}
hr = sourceNode.ConnectOutput(0, outputNode, 0);
if (Failed(hr))
{
mediaSink = null;
return(hr);
}
}
}
return(hr);
}
///////////////////////////////////////////////////////////////////////
// Name: CreateTopologyBranch
// Description: Adds a source and sink to the topology and
// connects them.
//
// pTopology: The topology.
// pSource: The media source.
// pPD: The source's presentation descriptor.
// pSD: The stream descriptor for the stream.
// pSink: The media sink.
//
///////////////////////////////////////////////////////////////////////
static void CreateTopologyBranch(
IMFTopology pTopology,
IMFMediaSource pSource, // Media source.
IMFPresentationDescriptor pPD, // Presentation descriptor.
IMFStreamDescriptor pSD, // Stream descriptor.
IMFMediaSinkAlt pSink
)
{
int hr;
IMFTopologyNode pSourceNode = null;
IMFTopologyNode pOutputNode = null;
CreateSourceNode(pSource, pPD, pSD, out pSourceNode);
try
{
CreateOutputNode(pSink, 0, out pOutputNode);
try
{
hr = pTopology.AddNode(pSourceNode);
MFError.ThrowExceptionForHR(hr);
hr = pTopology.AddNode(pOutputNode);
MFError.ThrowExceptionForHR(hr);
hr = pSourceNode.ConnectOutput(0, pOutputNode, 0);
MFError.ThrowExceptionForHR(hr);
}
finally
{
if (pOutputNode != null)
{
Marshal.ReleaseComObject(pOutputNode);
}
}
}
finally
{
if (pSourceNode != null)
{
Marshal.ReleaseComObject(pSourceNode);
}
}
}