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axmol/core/media/WmfMediaEngine.cpp

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//////////////////////////////////////////////////////////////////////////
//
// WmfMediaEngine.cpp : Playback helper class.
//
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
// PARTICULAR PURPOSE.
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//////////////////////////////////////////////////////////////////////////
#include "WmfMediaEngine.h"
#if defined(WINAPI_FAMILY) && (WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP)
# include <Shlwapi.h>
# include "MFUtils.h"
# include "ntcvt/ntcvt.hpp"
# include "yasio/core/sz.hpp"
NS_AX_BEGIN
// IF_FAILED_GOTO macro.
// Jumps to 'label' on failure.
# ifndef IF_FAILED_GOTO
# define IF_FAILED_GOTO(hr, label) \
if (FAILED(hr)) \
{ \
goto label; \
}
# endif
# define CHECK_HR(hr) IF_FAILED_GOTO(hr, done)
// const UINT WM_APP_PLAYER_EVENT = ::RegisterWindowMessageW(L"mfmedia-event");
// static MFOffset MakeOffset(float v)
//{
// // v = offset.value + (offset.fract / denominator), where denominator = 65536.0f.
// const int denominator = std::numeric_limits<WORD>::max() + 1;
// MFOffset offset;
// offset.value = short(v);
// offset.fract = WORD(denominator * (v - offset.value));
// return offset;
// }
//-------------------------------------------------------------------
// Name: CreateSourceStreamNode
// Description: Creates a source-stream node for a stream.
//
// pSource: Pointer to the media source that contains the stream.
// pSourcePD: Presentation descriptor for the media source.
// pSourceSD: Stream descriptor for the stream.
// ppNode: Receives a pointer to the new node.
//-------------------------------------------------------------------
static HRESULT CreateSourceStreamNode(IMFMediaSource* pSource,
IMFPresentationDescriptor* pSourcePD,
IMFStreamDescriptor* pSourceSD,
IMFTopologyNode** ppNode)
{
if (!pSource || !pSourcePD || !pSourceSD || !ppNode)
{
return E_POINTER;
}
TComPtr<IMFTopologyNode> SourceNode;
HRESULT hr = S_OK;
// Create the source-stream node.
CHECK_HR(hr = MFCreateTopologyNode(MF_TOPOLOGY_SOURCESTREAM_NODE, &SourceNode));
// Set attribute: Pointer to the media source.
CHECK_HR(hr = SourceNode->SetUnknown(MF_TOPONODE_SOURCE, pSource));
// Set attribute: Pointer to the presentation descriptor.
CHECK_HR(hr = SourceNode->SetUnknown(MF_TOPONODE_PRESENTATION_DESCRIPTOR, pSourcePD));
// Set attribute: Pointer to the stream descriptor.
CHECK_HR(hr = SourceNode->SetUnknown(MF_TOPONODE_STREAM_DESCRIPTOR, pSourceSD));
// Return the IMFTopologyNode pointer to the caller.
*ppNode = SourceNode.Get();
(*ppNode)->AddRef();
done:
return hr;
}
/**
* Implements a callback object for the MF video sample grabber sink.
*/
class MFVideoSampler : public IMFSampleGrabberSinkCallback
{
public:
/** Default constructor. */
MFVideoSampler(WmfMediaEngine* owner) : RefCount(1), Owner(owner) {}
//~ IMFSampleGrabberSinkCallback interface
STDMETHODIMP OnClockPause(MFTIME SystemTime) { return S_OK; }
STDMETHODIMP OnClockRestart(MFTIME SystemTime) { return S_OK; }
STDMETHODIMP OnClockSetRate(MFTIME SystemTime, float flRate) { return S_OK; }
STDMETHODIMP OnClockStart(MFTIME SystemTime, LONGLONG llClockStartOffset) { return S_OK; }
STDMETHODIMP OnClockStop(MFTIME SystemTime) { return S_OK; }
STDMETHODIMP OnProcessSample(REFGUID MajorMediaType,
DWORD SampleFlags,
LONGLONG SampleTime,
LONGLONG SampleDuration,
const BYTE* SampleBuffer,
DWORD SampleSize)
{
Owner->HandleVideoSample(SampleBuffer, SampleSize);
return S_OK;
}
STDMETHODIMP OnSetPresentationClock(IMFPresentationClock* Clock) { return S_OK; }
STDMETHODIMP OnShutdown() { return S_OK; }
public:
//~ IUnknown interface
STDMETHODIMP_(ULONG) AddRef() { return InterlockedIncrement(&RefCount); }
# if _MSC_VER == 1900
# pragma warning(push)
# pragma warning(disable : 4838)
# endif
STDMETHODIMP QueryInterface(REFIID RefID, void** Object)
{
static const QITAB QITab[] = {QITABENT(MFVideoSampler, IMFSampleGrabberSinkCallback), {0}};
return QISearch(this, QITab, RefID, Object);
}
# if _MSC_VER == 1900
# pragma warning(pop)
# endif
STDMETHODIMP_(ULONG) Release()
{
auto CurrentRefCount = InterlockedDecrement(&RefCount);
if (CurrentRefCount == 0)
{
delete this;
}
return CurrentRefCount;
}
private:
/** Hidden destructor (this class is reference counted). */
virtual ~MFVideoSampler() { assert(RefCount == 0); }
private:
/** Holds a reference counter for this instance. */
long RefCount;
WmfMediaEngine* Owner; // weak ref to owner
};
# if 0
///////////////////////////////////////////////////////////////////////
// Name: CreateInstance
// Description: Static class method to create the WmfMediaEngine object.
//
// hVideo: Handle to the video window.
// hEvent: Handle to the window to receive notifications.
// ppPlayer: Receives an AddRef's pointer to the WmfMediaEngine object.
// The caller must release the pointer.
/////////////////////////////////////////////////////////////////////////
HRESULT WmfMediaEngine::CreateInstance(WmfMediaEngine** ppPlayer)
{
AXME_TRACE((L"WmfMediaEngine::Create\n"));
if (ppPlayer == NULL)
{
return E_POINTER;
}
HRESULT hr = S_OK;
auto pPlayer = new WmfMediaEngine();
if (pPlayer == NULL)
{
return E_OUTOFMEMORY;
}
hr = pPlayer->Initialize();
if (SUCCEEDED(hr))
*ppPlayer = pPlayer;
else
pPlayer->Release();
return hr;
}
# endif
///////////////////////////////////////////////////////////////////////
// WmfMediaEngine constructor
/////////////////////////////////////////////////////////////////////////
WmfMediaEngine::WmfMediaEngine() : m_nRefCount(1) {}
///////////////////////////////////////////////////////////////////////
// WmfMediaEngine destructor
/////////////////////////////////////////////////////////////////////////
WmfMediaEngine::~WmfMediaEngine()
{
assert(m_pSession == NULL); // If FALSE, the app did not call Shutdown().
// Note: The application must call Shutdown() because the media
// session holds a reference count on the WmfMediaEngine object. (This happens
// when WmfMediaEngine calls IMediaEventGenerator::BeginGetEvent on the
// media session.) As a result, there is a circular reference count
// between the WmfMediaEngine object and the media session. Calling Shutdown()
// breaks the circular reference count.
// Note: If CreateInstance failed, the application will not call
// Shutdown(). To handle that case, we must call Shutdown() in the
// destructor. The circular ref-count problem does not occcur if
// CreateInstance has failed. Also, calling Shutdown() twice is
// harmless.
ClearPendingBuffers();
Shutdown();
}
//////////////////////////////////////////////////////////////////////
// Name: Initialize
// Initializes the WmfMediaEngine object. This method is called by the
// CreateInstance method.
/////////////////////////////////////////////////////////////////////////
HRESULT WmfMediaEngine::Initialize()
{
HRESULT hr = S_OK;
if (m_hCloseEvent)
{
return MF_E_ALREADY_INITIALIZED;
}
// Start up Media Foundation platform.
CHECK_HR(hr = MFUtils::InitializeMFOnce());
m_hOpenEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
if (m_hOpenEvent == NULL)
{
CHECK_HR(hr = HRESULT_FROM_WIN32(GetLastError()));
}
m_hCloseEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
if (m_hCloseEvent == NULL)
{
CHECK_HR(hr = HRESULT_FROM_WIN32(GetLastError()));
}
done:
return hr;
}
///////////////////////////////////////////////////////////////////////
// AddRef
/////////////////////////////////////////////////////////////////////////
ULONG WmfMediaEngine::AddRef()
{
return InterlockedIncrement(&m_nRefCount);
}
///////////////////////////////////////////////////////////////////////
// Release
/////////////////////////////////////////////////////////////////////////
ULONG WmfMediaEngine::Release()
{
ULONG uCount = InterlockedDecrement(&m_nRefCount);
if (uCount == 0)
{
delete this;
}
// For thread safety, return a temporary variable.
return uCount;
}
///////////////////////////////////////////////////////////////////////
// QueryInterface
/////////////////////////////////////////////////////////////////////////
HRESULT WmfMediaEngine::QueryInterface(REFIID iid, void** ppv)
{
if (!ppv)
{
return E_POINTER;
}
if (iid == IID_IUnknown)
{
*ppv = static_cast<IUnknown*>(this);
}
else if (iid == IID_IMFAsyncCallback)
{
*ppv = static_cast<IMFAsyncCallback*>(this);
}
else
{
*ppv = NULL;
return E_NOINTERFACE;
}
AddRef();
return S_OK;
}
///////////////////////////////////////////////////////////////////////
// Name: OpenURL
// Description: Opens a URL for playback.
/////////////////////////////////////////////////////////////////////////
bool WmfMediaEngine::Open(std::string_view sourceUri)
{
Close();
if (sourceUri.empty())
return false;
AXME_TRACE("WmfMediaEngine::OpenURL\n");
AXME_TRACE("URL = %s\n", sourceUri.data());
// 1. Create a new media session.
// 2. Create the media source.
// 3. Create the topology.
// 4. Queue the topology [asynchronous]
// 5. Start playback [asynchronous - does not happen in this method.]
// Create the media session.
if (FAILED(CreateSession()))
return false;
// Set our state to "open pending"
m_state = MEMediaState::Preparing;
TComPtr<IUnknown> sharedFromThis;
this->QueryInterface(IID_IUnknown, &sharedFromThis);
m_bOpenPending = true;
std::thread t([this, sharedFromThis, wsourceUri = ntcvt::from_chars(sourceUri)] {
TComPtr<IMFTopology> pTopology;
TComPtr<IMFClock> pClock;
try
{
// Create the media source.
DX::ThrowIfFailed(CreateMediaSource(wsourceUri.c_str()));
if (!m_pSession)
DX::ThrowIfFailed(E_POINTER);
// Create a partial topology.
DX::ThrowIfFailed(CreateTopologyFromSource(&pTopology));
// Set the topology on the media session.
DX::ThrowIfFailed(m_pSession->SetTopology(0, pTopology.Get()));
// If SetTopology succeeded, the media session will queue an
// MESessionTopologySet event.
// ======> Read media properties
// Get the session capabilities.
DX::ThrowIfFailed(m_pSession->GetSessionCapabilities(&m_caps));
// Get the duration from the presentation descriptor (optional)
(void)m_PresentDescriptor->GetUINT64(MF_PD_DURATION, (UINT64*)&m_hnsDuration);
// Get the presentation clock (optional)
auto hr = m_pSession->GetClock(&pClock);
if (SUCCEEDED(hr))
DX::ThrowIfFailed(hr = pClock->QueryInterface(IID_PPV_ARGS(&m_pClock)));
// Get the rate control interface (optional)
DX::ThrowIfFailed(MFGetService(m_pSession.Get(), MF_RATE_CONTROL_SERVICE, IID_PPV_ARGS(&m_RateControl)));
DX::ThrowIfFailed(MFGetService(m_pSession.Get(), MF_RATE_CONTROL_SERVICE, IID_PPV_ARGS(&m_RateSupport)));
// Check if rate 0 (scrubbing) is supported.
if (SUCCEEDED(m_RateSupport->IsRateSupported(TRUE, 0, NULL)))
m_bCanScrub = TRUE;
// if m_pRate is NULL, m_bCanScrub must be FALSE.
assert(m_RateControl || !m_bCanScrub);
}
catch (const std::exception& ex)
{
AXME_TRACE("Exception occurred when Open Media: %s", ex.what());
m_state = MEMediaState::Error;
}
m_bOpenPending = false;
SetEvent(m_hOpenEvent);
});
t.detach();
return true;
}
bool WmfMediaEngine::Close()
{
if (m_bOpenPending)
WaitForSingleObject(m_hOpenEvent, INFINITE);
ClearPendingBuffers();
HRESULT hr = S_OK;
auto state = GetState();
if (state != MEMediaState::Closing && state != MEMediaState::Closed)
{
Stop();
hr = CloseSession();
}
return SUCCEEDED(hr);
}
///////////////////////////////////////////////////////////////////////
// Name: Invoke
// Description: Callback for asynchronous BeginGetEvent method.
//
// pAsyncResult: Pointer to the result.
/////////////////////////////////////////////////////////////////////////
HRESULT WmfMediaEngine::Invoke(IMFAsyncResult* pResult)
{
HRESULT hr = S_OK;
::MediaEventType meType = MEUnknown; // Event type
TComPtr<IMFMediaEvent> pEvent;
// Get the event from the event queue.
CHECK_HR(hr = m_pSession->EndGetEvent(pResult, &pEvent));
// Get the event type.
CHECK_HR(hr = pEvent->GetType(&meType));
// If the session is closed, the application is waiting on the
// m_hCloseEvent event handle. Also, do not get any more
// events from the session.
if (meType == MESessionClosed)
{
SetEvent(m_hCloseEvent);
}
else
{
// For all other events, ask the media session for the
// next event in the queue.
CHECK_HR(hr = m_pSession->BeginGetEvent(this, NULL));
}
// For most events, we post the event as a private window message to the
// application. This lets the application process the event on it's
// main thread.
// However, if call to IMFMediaSession::Close is pending, it means the
// application is waiting on the m_hCloseEvent event handle. (Blocking
// call.) In that case, we simply discard the event.
// NOTE: When IMFMediaSession::Close is called, MESessionClosed is NOT
// necessarily the next event that we will receive. We may receive
// any number of other events before receiving MESessionClosed.
if (m_state != MEMediaState::Closing)
{
HandleEvent(pEvent.Get());
// if (!m_hwndEvent)
// HandleEvent((WPARAM)pEvent.Get());
// else
// PostMessage(m_hwndEvent, WM_APP_PLAYER_EVENT, (WPARAM)pEvent.Get(), (LPARAM)0);
}
done:
// SAFE_RELEASE(pEvent);
return S_OK;
}
void WmfMediaEngine::HandleVideoSample(const uint8_t* buf, size_t len)
{
std::unique_lock<std::mutex> lck(m_frameBuffer1Mtx);
m_frameBuffer1.assign(buf, buf + len, std::true_type{});
}
void WmfMediaEngine::ClearPendingBuffers()
{
std::unique_lock<std::mutex> lck(m_frameBuffer1Mtx);
m_frameBuffer1.clear();
m_frameBuffer2.clear();
}
bool WmfMediaEngine::TransferVideoFrame(std::function<void(const MEVideoFrame&)> callback)
{
if (m_state != MEMediaState::Playing || m_frameBuffer1.empty())
return false;
std::unique_lock<std::mutex> lck(m_frameBuffer1Mtx);
if (!m_frameBuffer1.empty())
{
m_frameBuffer2.swap(m_frameBuffer1);
lck.unlock(); // unlock immidiately before invoke user callback (maybe upload buffer to GPU)
auto& buffer = m_frameBuffer2;
auto cbcrData =
(m_videoPF == MEVideoPixelFormat::NV12) ? buffer.data() + m_frameExtent.x * m_frameExtent.y : nullptr;
MEVideoFrame frame{buffer.data(), cbcrData, buffer.size(),
MEVideoPixelDesc{m_videoPF, MEIntPoint{m_frameExtent.x, m_frameExtent.y}}, m_videoExtent};
# if defined(_DEBUG)
switch (m_videoPF)
{
case MEVideoPixelFormat::YUY2:
assert(m_frameExtent.x == (m_bIsH264 ? YASIO_SZ_ALIGN(m_frameExtent.x, 16) : m_frameExtent.x));
break;
case MEVideoPixelFormat::NV12:
{
// HEVC(H265) on Windows, both height width align 32
// refer to: https://community.intel.com/t5/Media-Intel-oneAPI-Video/32-byte-alignment-for-HEVC/m-p/1048275
auto& desc = frame._ycbcrDesc;
desc.YDim.x = YASIO_SZ_ALIGN(m_videoExtent.x, 32);
desc.YDim.y = m_bIsHEVC ? YASIO_SZ_ALIGN(m_videoExtent.y, 32) : m_videoExtent.y;
desc.CbCrDim.x = desc.YDim.x / 2;
desc.CbCrDim.y = desc.YDim.y / 2;
desc.YPitch = desc.YDim.x;
desc.CbCrPitch = desc.YPitch;
assert(frame._vpd._dim.x * frame._vpd._dim.y * 3 / 2 == static_cast<int>(frame._dataLen));
assert((desc.YPitch * desc.YDim.y + desc.CbCrPitch * desc.CbCrDim.y) == static_cast<int>(frame._dataLen));
break;
}
default:
assert(m_videoPF == MEVideoPixelFormat::RGB32 || m_videoPF == MEVideoPixelFormat::BGR32);
}
# endif
// check data
callback(frame);
m_frameBuffer2.clear();
return true;
}
return false;
}
//-------------------------------------------------------------------
// HandleEvent
//
// Called by the application when it receives a WM_APP_PLAYER_EVENT
// message.
//
// This method is used to process media session events on the
// application's main thread.
//
// pUnkPtr: Pointer to the IUnknown interface of a media session
// event (IMFMediaEvent).
//-------------------------------------------------------------------
HRESULT WmfMediaEngine::HandleEvent(IMFMediaEvent* pEvent)
{
HRESULT hr = S_OK;
HRESULT hrStatus = S_OK; // Event status
::MediaEventType meType = MEUnknown; // Event type
MF_TOPOSTATUS TopoStatus = MF_TOPOSTATUS_INVALID; // Used with MESessionTopologyStatus event.
// auto pUnk = MFUtils::ReferencedPtrToComPtr((IUnknown*)pUnkPtr);
// TComPtr<IMFMediaEvent> pEvent;
PROPVARIANT var;
if (!pEvent)
{
return E_POINTER;
}
// CHECK_HR(hr = pUnk->QueryInterface(__uuidof(IMFMediaEvent), (void**)&pEvent));
// Get the event type.
CHECK_HR(hr = pEvent->GetType(&meType));
// Get the event status. If the operation that triggered the event did
// not succeed, the status is a failure code.
CHECK_HR(hr = pEvent->GetStatus(&hrStatus));
// AXME_TRACE("Media event: %s\n", EventName(meType));
// Check if the async operation succeeded.
if (SUCCEEDED(hrStatus))
{
// Switch on the event type. Update the internal state of the WmfMediaEngine as needed.
switch (meType)
{
case MESessionTopologyStatus:
// Get the status code.
CHECK_HR(hr = pEvent->GetUINT32(MF_EVENT_TOPOLOGY_STATUS, (UINT32*)&TopoStatus));
switch (TopoStatus)
{
case MF_TOPOSTATUS_READY:
hr = OnTopologyReady(pEvent);
break;
default:
// Nothing to do.
break;
}
break;
case MEEndOfPresentation:
OnPlayEnded(pEvent);
break;
case MESessionStarted:
OnSessionStart(hrStatus);
FireMediaEvent(MEMediaEventType::Playing);
break;
case MESessionStopped:
OnSessionStop(hrStatus);
FireMediaEvent(MEMediaEventType::Stopped);
break;
case MESessionPaused:
OnSessionPause(hrStatus);
FireMediaEvent(MEMediaEventType::Paused);
break;
case MESessionRateChanged:
// If the rate change succeeded, we've already got the rate
// cached. If it failed, try to get the actual rate.
if (FAILED(hrStatus))
{
PropVariantInit(&var);
hr = pEvent->GetValue(&var);
if (SUCCEEDED(hr) && (var.vt == VT_R4))
{
m_nominal.fRate = var.fltVal;
}
}
break;
case MESessionEnded:
OnSessionEnded(hrStatus);
FireMediaEvent(MEMediaEventType::Completed);
break;
case MESessionCapabilitiesChanged:
// The session capabilities changed. Get the updated capabilities.
m_caps = MFGetAttributeUINT32(pEvent, MF_EVENT_SESSIONCAPS, m_caps);
break;
}
}
else
{
hr = hrStatus;
}
done:
return hr;
}
///////////////////////////////////////////////////////////////////////
// Name: ShutDown
// Description: Releases all resources held by this object.
/////////////////////////////////////////////////////////////////////////
HRESULT WmfMediaEngine::Shutdown()
{
AXME_TRACE("WmfMediaEngine::ShutDown\n");
HRESULT hr = S_OK;
// Close the session
hr = CloseSession();
if (m_hCloseEvent)
{
CloseHandle(m_hCloseEvent);
m_hCloseEvent = nullptr;
}
if (m_hOpenEvent)
{
CloseHandle(m_hOpenEvent);
m_hOpenEvent = nullptr;
}
return hr;
}
///
///
/// Protected methods
///
/// All methods that follow are private to the WmfMediaEngine class.
///
///
///////////////////////////////////////////////////////////////////////
// Name: OnTopologyReady
// Description: Handler for MESessionTopologyReady event.
//
// Note:
// - The MESessionTopologySet event means the session queued the
// topology, but the topology is not ready yet. Generally, the
// applicationno need to respond to this event unless there is an
// error.
// - The MESessionTopologyReady event means the new topology is
// ready for playback. After this event is received, any calls to
// IMFGetService will get service interfaces from the new topology.
/////////////////////////////////////////////////////////////////////////
HRESULT WmfMediaEngine::OnTopologyReady(IMFMediaEvent* pEvent)
{
AXME_TRACE("WmfMediaEngine::OnTopologyReady\n");
UINT32 w = 0, h = 0;
MFGetAttributeSize(m_videoInputType.Get(), MF_MT_FRAME_SIZE, &w, &h);
m_frameExtent.x = m_bIsH264 ? YASIO_SZ_ALIGN(w, 16) : w;
m_frameExtent.y = h;
DWORD cx = 0, cy = 0;
GetNativeVideoSize(&cx, &cy);
m_videoExtent.x = cx;
m_videoExtent.y = cy;
if (m_bAutoPlay)
StartPlayback(nullptr);
return S_OK;
}
// Starts playback.
bool WmfMediaEngine::Play()
{
HRESULT hr = S_OK;
AXME_TRACE("WmfMediaEngine::Play\n");
if (m_state != MEMediaState::Paused && m_state != MEMediaState::Stopped)
MF_E_INVALIDREQUEST;
if (m_pSession == NULL || m_pSource == NULL)
E_UNEXPECTED;
AutoLock lock(m_critsec);
// If another operation is pending, cache the request.
// Otherwise, start the media session.
if (m_bPending)
{
m_request.command = CmdStart;
}
else
{
hr = StartPlayback(nullptr);
m_nominal.command = CmdStart;
m_bPending = CMD_PENDING;
}
return SUCCEEDED(hr);
}
// Pauses playback.
bool WmfMediaEngine::Pause()
{
HRESULT hr = S_OK;
if (m_pSession == NULL || m_pSource == NULL)
E_UNEXPECTED;
AutoLock lock(m_critsec);
// If another operation is pending, cache the request.
// Otherwise, pause the media session.
if (m_bPending)
{
m_request.command = CmdPause;
}
else
{
hr = m_pSession->Pause();
m_nominal.command = CmdPause;
m_bPending = CMD_PENDING;
}
if (SUCCEEDED(hr))
m_state = MEMediaState::Paused;
return SUCCEEDED(hr);
}
// Stops playback.
bool WmfMediaEngine::Stop()
{
HRESULT hr = S_OK;
if (m_pSession == NULL || m_pSource == NULL)
return false; // E_UNEXPECTED;
AutoLock lock(m_critsec);
if (m_state == MEMediaState::Stopped)
return false; // S_OK;
// If another operation is pending, cache the request.
// Otherwise, stop the media session.
if (m_bPending)
{
m_request.command = CmdStop;
}
else
{
hr = m_pSession->Stop();
m_nominal.command = CmdStop;
m_bPending = CMD_PENDING;
}
if (SUCCEEDED(hr))
m_state = MEMediaState::Stopped;
return SUCCEEDED(hr);
}
BOOL WmfMediaEngine::CanSeek() const
{
bool bCanSeek = (((m_caps & MFSESSIONCAP_SEEK) == MFSESSIONCAP_SEEK) && (m_hnsDuration > 0) && (m_pClock != NULL));
return bCanSeek;
}
MFTIME WmfMediaEngine::GetDuration() const
{
return m_hnsDuration;
}
MFTIME WmfMediaEngine::GetCurrentPosition() const
{
HRESULT hr = S_OK;
// TODO:
AutoLock lock(m_critsec);
MFTIME hnsPosition = 0;
if (m_pClock == NULL)
{
return MF_E_NO_CLOCK;
}
// Return, in order:
// 1. Cached seek request (nominal position).
// 2. Pending seek operation (nominal position).
// 3. Presentation time (actual position).
if (m_request.command == CmdSeek)
{
hnsPosition = m_request.hnsStart;
}
else if (m_bPending & CMD_PENDING_SEEK)
{
hnsPosition = m_nominal.hnsStart;
}
else
{
hr = m_pClock->GetTime(&hnsPosition);
}
return hnsPosition;
}
HRESULT WmfMediaEngine::SetPosition(MFTIME hnsPosition)
{
AutoLock lock(m_critsec);
HRESULT hr = S_OK;
if (m_bPending)
{
// Currently seeking or changing rates, so cache this request.
m_request.command = CmdSeek;
m_request.hnsStart = hnsPosition;
}
else
{
hr = SetPositionInternal(hnsPosition);
}
return hr;
}
BOOL WmfMediaEngine::CanScrub() const
{
return m_bCanScrub;
}
HRESULT WmfMediaEngine::Scrub(BOOL bScrub)
{
// Scrubbing is implemented as rate = 0.
AutoLock lock(m_critsec);
if (!m_RateControl)
{
return MF_E_INVALIDREQUEST;
}
if (!m_bCanScrub)
{
return MF_E_INVALIDREQUEST;
}
HRESULT hr = S_OK;
if (bScrub)
{
// Enter scrubbing mode. Cache the current rate.
if (GetNominalRate() != 0)
{
m_fPrevRate = m_nominal.fRate;
}
hr = SetRate(0.0f) ? S_OK : E_FAIL;
}
else
{
// Leaving scrubbing mode. Restore the old rate.
if (GetNominalRate() == 0)
{
hr = SetRate(m_fPrevRate) ? S_OK : E_FAIL;
}
}
return hr;
}
BOOL WmfMediaEngine::CanFastForward() const
{
BOOL bCanFF = ((m_caps & MFSESSIONCAP_RATE_FORWARD) == MFSESSIONCAP_RATE_FORWARD);
return bCanFF;
}
BOOL WmfMediaEngine::CanRewind() const
{
BOOL bCanRewind = ((m_caps & MFSESSIONCAP_RATE_REVERSE) == MFSESSIONCAP_RATE_REVERSE);
return bCanRewind;
}
HRESULT WmfMediaEngine::FastForward()
{
if (!m_RateControl)
{
return MF_E_INVALIDREQUEST;
}
HRESULT hr = S_OK;
float fTarget = GetNominalRate() * 2;
if (fTarget <= 0.0f)
{
fTarget = 1.0f;
}
hr = SetRate(fTarget) ? S_OK : E_FAIL;
return hr;
}
HRESULT WmfMediaEngine::Rewind()
{
if (!m_RateControl)
{
return MF_E_INVALIDREQUEST;
}
HRESULT hr = S_OK;
float fTarget = GetNominalRate() * 2;
if (fTarget >= 0.0f)
{
fTarget = -1.0f;
}
SetRate(fTarget);
return hr;
}
bool WmfMediaEngine::SetRate(double lfRate)
{
HRESULT hr = S_OK;
BOOL bThin = FALSE;
AutoLock lock(m_critsec);
const float fRate = static_cast<float>(lfRate);
if (fRate == GetNominalRate())
{
return true; // S_OK; // no-op
}
if (m_RateSupport == NULL)
{
return false; // MF_E_INVALIDREQUEST;
}
// Check if this rate is supported. Try non-thinned playback first,
// then fall back to thinned playback.
hr = m_RateSupport->IsRateSupported(FALSE, fRate, NULL);
if (FAILED(hr) && hr != MF_E_INVALIDREQUEST)
{
bThin = TRUE;
hr = m_RateSupport->IsRateSupported(TRUE, fRate, NULL);
}
if (FAILED(hr) && hr != MF_E_INVALIDREQUEST)
{
// Unsupported rate.
return SUCCEEDED(hr);
}
// If there is an operation pending, cache the request.
if (m_bPending || hr == MF_E_INVALIDREQUEST)
{
m_bPending = CMD_PENDING_RATE;
m_request.fRate = fRate;
m_request.bThin = bThin;
// Remember the current transport state (play, paused, etc), so that we
// can restore it after the rate change, if necessary. However, if
// anothercommand is already pending, that one takes precedent.
if (m_request.command == CmdNone)
{
m_request.command = m_nominal.command;
}
}
else
{
// No pending operation. Commit the new rate.
hr = CommitRateChange(fRate, bThin);
}
return SUCCEEDED(hr);
}
HRESULT WmfMediaEngine::SetPositionInternal(const MFTIME& hnsPosition)
{
assert(!m_bPending);
if (m_pSession == NULL)
{
return MF_E_INVALIDREQUEST;
}
HRESULT hr = StartPlayback(&hnsPosition);
if (SUCCEEDED(hr))
{
// Store the pending state.
m_nominal.command = CmdStart;
m_nominal.hnsStart = hnsPosition;
m_bPending = CMD_PENDING_SEEK;
m_state = MEMediaState::Playing;
}
return hr;
}
HRESULT WmfMediaEngine::StartPlayback(const MFTIME* hnsPosition)
{
HRESULT hr = S_OK;
PROPVARIANT varStart;
if (!hnsPosition)
varStart.vt = VT_EMPTY;
else
{
varStart.vt = VT_I8;
varStart.hVal.QuadPart = *hnsPosition;
}
// Try apply pending rate before start playback
if (m_bPending & CMD_PENDING_RATE && m_request.fRate != m_nominal.fRate)
{
if (SUCCEEDED(m_RateControl->SetRate(m_request.bThin, m_request.fRate)))
{
m_bPending = FALSE;
m_request.command = CmdNone;
m_nominal.fRate = m_request.fRate;
}
}
hr = m_pSession->Start(NULL, &varStart);
// Note: Start is an asynchronous operation. However, we
// can treat our state as being already started. If Start
// fails later, we'll get an MESessionStarted event with
// an error code, and we will update our state then.
if (SUCCEEDED(hr))
m_state = MEMediaState::Playing;
return hr;
}
HRESULT WmfMediaEngine::CommitRateChange(float fRate, BOOL bThin)
{
assert(!m_bPending);
// Caller holds the lock.
HRESULT hr = S_OK;
MFTIME hnsSystemTime = 0;
MFTIME hnsClockTime = 0;
Command cmdNow = m_nominal.command;
TComPtr<IMFClock> pClock;
// Allowed rate transitions:
// Positive <-> negative: Stopped
// Negative <-> zero: Stopped
// Postive <-> zero: Paused or stopped
if ((fRate > 0 && m_nominal.fRate <= 0) || (fRate < 0 && m_nominal.fRate >= 0))
{
// Transition to stopped.
if (cmdNow == CmdStart)
{
// Get the current clock position. This will be the restart time.
hr = m_pSession->GetClock(&pClock);
if (FAILED(hr))
{
goto done;
}
(void)pClock->GetCorrelatedTime(0, &hnsClockTime, &hnsSystemTime);
assert(hnsSystemTime != 0);
// Stop and set the rate
if (!Stop())
{
hr = E_FAIL;
goto done;
}
// Cache Request: Restart from stop.
m_request.command = CmdSeek;
m_request.hnsStart = hnsClockTime;
}
else if (cmdNow == CmdPause)
{
// The current state is paused.
// For this rate change, the session must be stopped. However, the
// session cannot transition back from stopped to paused.
// Therefore, this rate transition is not supported while paused.
hr = MF_E_UNSUPPORTED_STATE_TRANSITION;
goto done;
}
}
else if (fRate == 0 && m_nominal.fRate != 0)
{
if (cmdNow != CmdPause)
{
// Transition to paused.
// This transisition requires the paused state.
// Pause and set the rate.
if (!Pause())
{
hr = E_FAIL;
goto done;
}
// Request: Switch back to current state.
m_request.command = cmdNow;
}
}
// Set the rate.
hr = m_RateControl->SetRate(bThin, fRate);
if (FAILED(hr))
{
goto done;
}
// Adjust our current rate and requested rate.
m_request.fRate = m_nominal.fRate = fRate;
done:
return hr;
}
float WmfMediaEngine::GetNominalRate() const
{
return m_request.fRate;
}
HRESULT WmfMediaEngine::UpdatePendingCommands(Command cmd)
{
HRESULT hr = S_OK;
PROPVARIANT varStart;
PropVariantInit(&varStart);
AutoLock lock(m_critsec);
if (m_bPending && m_nominal.command == cmd)
{
m_bPending = FALSE;
// The current pending command has completed.
// First look for rate changes.
if (m_request.fRate != m_nominal.fRate)
{
hr = CommitRateChange(m_request.fRate, m_request.bThin);
if (FAILED(hr))
{
goto done;
}
}
// Now look for seek requests.
if (!m_bPending)
{
switch (m_request.command)
{
case CmdNone:
// Nothing to do.
break;
case CmdStart:
Play();
break;
case CmdPause:
Pause();
break;
case CmdStop:
Stop();
break;
case CmdSeek:
SetPositionInternal(m_request.hnsStart);
break;
}
m_request.command = CmdNone;
}
}
done:
return hr;
}
HRESULT WmfMediaEngine::OnPlayEnded(IMFMediaEvent* pEvent)
{
AXME_TRACE("WmfMediaEngine::OnPlayEnded\n");
// The session puts itself into the stopped state autmoatically.
m_state = MEMediaState::Stopped;
if (m_bLooping)
{
SetPosition(0);
}
return S_OK;
}
HRESULT WmfMediaEngine::OnSessionStart(HRESULT hrStatus)
{
HRESULT hr = S_OK;
if (FAILED(hrStatus))
{
return hrStatus;
}
// The Media Session completed a start/seek operation. Check if there
// is another seek request pending.
UpdatePendingCommands(CmdStart);
return hr;
}
HRESULT WmfMediaEngine::OnSessionStop(HRESULT hrStatus)
{
HRESULT hr = S_OK;
if (FAILED(hrStatus))
{
return hrStatus;
}
// The Media Session completed a transition to stopped. This might occur
// because we are changing playback direction (forward/rewind). Check if
// there is a pending rate-change request.
UpdatePendingCommands(CmdStop);
return hr;
}
HRESULT WmfMediaEngine::OnSessionPause(HRESULT hrStatus)
{
HRESULT hr = S_OK;
if (FAILED(hrStatus))
{
return hrStatus;
}
hr = UpdatePendingCommands(CmdPause);
return hr;
}
HRESULT WmfMediaEngine::OnSessionEnded(HRESULT hrStatus)
{ // After the session ends, playback starts from position zero. But if the
// current playback rate is reversed, playback would end immediately
// (reversing from position 0). Therefore, reset the rate to 1x.
if (GetNominalRate() < 0.0f)
{
m_nominal.command = CmdStop;
hrStatus = CommitRateChange(1.0f, FALSE);
}
return hrStatus;
}
///////////////////////////////////////////////////////////////////////
// Name: CreateSession
// Description: Creates a new instance of the media session.
/////////////////////////////////////////////////////////////////////////
HRESULT WmfMediaEngine::CreateSession()
{
AXME_TRACE("WmfMediaEngine::CreateSession\n");
HRESULT hr = S_OK;
TComPtr<IMFAttributes> pAttributes;
// IMFActivate *pEnablerActivate = NULL;
// Close the old session, if any.
CHECK_HR(hr = CloseSession());
assert(m_state == MEMediaState::Closed);
// Create a new attribute store.
CHECK_HR(hr = MFCreateAttributes(&pAttributes, 2));
pAttributes->SetUINT32(MF_LOW_LATENCY, TRUE);
CHECK_HR(hr = MFCreateMediaSession(pAttributes.Get(), &m_pSession));
// TODO:
// If MFCreatePMPMediaSession fails it might return an IMFActivate pointer.
// This indicates that a trusted binary failed to load in the protected process.
// An application can use the IMFActivate pointer to create an enabler object, which
// provides revocation and renewal information for the component that failed to
// load.
// This sample does not demonstrate that feature. Instead, we simply treat this
// case as a playback failure.
// Start pulling events from the media session
CHECK_HR(hr = m_pSession->BeginGetEvent((IMFAsyncCallback*)this, NULL));
done:
// SAFE_RELEASE(pAttributes);
// SAFE_RELEASE(pEnablerActivate);
return hr;
}
///////////////////////////////////////////////////////////////////////
// Name: CloseSession
// Description: Closes the media session.
//
// Note: The IMFMediaSession::Close method is asynchronous, but the
// WmfMediaEngine::CloseSession method waits on the MESessionClosed event.
// The MESessionClosed event is guaranteed to be the last event
// that the media session fires.
/////////////////////////////////////////////////////////////////////////
HRESULT WmfMediaEngine::CloseSession()
{
HRESULT hr = S_OK;
// SAFE_RELEASE(m_pVideoDisplay);
if (m_pSession)
{
DWORD dwWaitResult = 0;
m_state = MEMediaState::Closing;
CHECK_HR(hr = m_pSession->Close());
// Wait for the close operation to complete
dwWaitResult = WaitForSingleObject(m_hCloseEvent, 5000);
if (dwWaitResult == WAIT_TIMEOUT)
{
AXME_TRACE("CloseSession timed out!\n");
}
// Now there will be no more events from this session.
}
// Complete shutdown operations.
// Shut down the media source. (Synchronous operation, no events.)
if (m_pSource)
{
m_pSource->Shutdown();
}
// Shut down the media session. (Synchronous operation, no events.)
if (m_pSession)
{
m_pSession->Shutdown();
}
m_PresentDescriptor.Reset();
m_RateControl.Reset();
m_RateSupport.Reset();
m_pClock.Reset();
m_pSource.Reset();
m_pSession.Reset();
m_state = MEMediaState::Closed;
m_bPending = false;
done:
return hr;
}
///////////////////////////////////////////////////////////////////////
// Name: CreateMediaSource
// Description: Create a media source from a URL.
//
// sURL: The URL to open.
/////////////////////////////////////////////////////////////////////////
HRESULT WmfMediaEngine::CreateMediaSource(const WCHAR* sURL)
{
AXME_TRACE("WmfMediaEngine::CreateMediaSource\n");
HRESULT hr = S_OK;
MF_OBJECT_TYPE ObjectType = MF_OBJECT_INVALID;
TComPtr<IMFSourceResolver> pSourceResolver;
TComPtr<IUnknown> pSource;
m_pSource.Reset(); // SAFE_RELEASE(m_pSource);
// Create the source resolver.
CHECK_HR(hr = MFCreateSourceResolver(&pSourceResolver));
// Use the source resolver to create the media source.
// Note: For simplicity this sample uses the synchronous method on
// IMFSourceResolver to create the media source. However, creating a
// media source can take a noticeable amount of time, especially for
// a network source. For a more responsive UI, use the asynchronous
// BeginCreateObjectFromURL method.
CHECK_HR(hr = pSourceResolver->CreateObjectFromURL(sURL, // URL of the source.
MF_RESOLUTION_MEDIASOURCE, // Create a source object.
NULL, // Optional property store.
&ObjectType, // Receives the created object type.
&pSource // Receives a pointer to the media source.
));
// Get the IMFMediaSource interface from the media source.
CHECK_HR(hr = pSource->QueryInterface(__uuidof(IMFMediaSource), (void**)&m_pSource));
done:
// SAFE_RELEASE(pSourceResolver);
// SAFE_RELEASE(pSource);
return hr;
}
///////////////////////////////////////////////////////////////////////
// CreateTopologyFromSource
// Description: Create a playback topology from the media source.
//
// Pre-condition: The media source must be created already.
// Call CreateMediaSource() before calling this method.
/////////////////////////////////////////////////////////////////////////
HRESULT WmfMediaEngine::CreateTopologyFromSource(IMFTopology** ppTopology)
{
AXME_TRACE("WmfMediaEngine::CreateTopologyFromSource\n");
assert(m_pSession != NULL);
assert(m_pSource != NULL);
HRESULT hr = S_OK;
TComPtr<IMFTopology> pTopology;
DWORD cSourceStreams = 0;
// Create a new topology.
CHECK_HR(hr = MFCreateTopology(&pTopology));
// Create the presentation descriptor for the media source.
CHECK_HR(hr = m_pSource->CreatePresentationDescriptor(&m_PresentDescriptor));
// Get the number of streams in the media source.
CHECK_HR(hr = m_PresentDescriptor->GetStreamDescriptorCount(&cSourceStreams));
AXME_TRACE("Stream count: %d\n", cSourceStreams);
// For each stream, create the topology nodes and add them to the topology.
for (DWORD i = 0; i < cSourceStreams; ++i)
{
CHECK_HR(hr = AddBranchToPartialTopology(pTopology.Get(), m_PresentDescriptor.Get(), i));
}
// Return the IMFTopology pointer to the caller.
if (SUCCEEDED(hr))
{
*ppTopology = pTopology.Get();
(*ppTopology)->AddRef();
}
done:
return hr;
}
///////////////////////////////////////////////////////////////////////
// Name: AddBranchToPartialTopology
// Description: Adds a topology branch for one stream.
//
// pTopology: Pointer to the topology object.
// 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.
// The media session will resolve the topology, so we do not have
// to worry about decoders or other transforms.
/////////////////////////////////////////////////////////////////////////
HRESULT WmfMediaEngine::AddBranchToPartialTopology(IMFTopology* pTopology,
IMFPresentationDescriptor* pSourcePD,
DWORD iStream)
{
AXME_TRACE("WmfMediaEngine::AddBranchToPartialTopology\n");
assert(pTopology != NULL);
TComPtr<IMFStreamDescriptor> pSourceSD;
TComPtr<IMFTopologyNode> pSourceNode;
TComPtr<IMFTopologyNode> pOutputNode;
BOOL fSelected = FALSE;
HRESULT hr = S_OK;
// Get the stream descriptor for this stream.
CHECK_HR(hr = pSourcePD->GetStreamDescriptorByIndex(iStream, &fSelected, &pSourceSD));
// Create the topology branch only if the stream is selected.
// Otherwise, do nothing.
if (fSelected)
{
// Create a source node for this stream.
CHECK_HR(hr = CreateSourceStreamNode(m_pSource.Get(), pSourcePD, pSourceSD.Get(), &pSourceNode));
// Create the output node for the renderer.
CHECK_HR(hr = CreateOutputNode(pSourceSD.Get(), &pOutputNode));
// Add both nodes to the topology.
CHECK_HR(hr = pTopology->AddNode(pSourceNode.Get()));
CHECK_HR(hr = pTopology->AddNode(pOutputNode.Get()));
// Connect the source node to the output node.
CHECK_HR(hr = pSourceNode->ConnectOutput(0, pOutputNode.Get(), 0));
}
done:
// Clean up.
return hr;
}
//-------------------------------------------------------------------
// Name: CreateOutputNode
// Description: Create an output node for a stream.
//
// pSourceSD: Stream descriptor for the stream.
// ppNode: Receives a pointer to the new node.
//
// Notes:
// This function does the following:
// 1. Chooses a renderer based on the media type of the stream.
// 2. Creates an IActivate object for the renderer.
// 3. Creates an output topology node.
// 4. Sets the IActivate pointer on the node.
//-------------------------------------------------------------------
HRESULT WmfMediaEngine::CreateOutputNode(IMFStreamDescriptor* pSourceSD, IMFTopologyNode** ppNode)
{
TComPtr<IMFTopologyNode> OutputNode;
TComPtr<IMFMediaTypeHandler> pHandler;
TComPtr<IMFActivate> pRendererActivate;
GUID guidMajorType = GUID_NULL;
HRESULT hr = S_OK;
// Get the stream ID.
DWORD streamID = 0;
pSourceSD->GetStreamIdentifier(&streamID); // Just for debugging, ignore any failures.
// Get the media type handler for the stream.
CHECK_HR(hr = pSourceSD->GetMediaTypeHandler(&pHandler));
// Get the major media type.
CHECK_HR(hr = pHandler->GetMajorType(&guidMajorType));
// Create a downstream node.
CHECK_HR(hr = MFCreateTopologyNode(MF_TOPOLOGY_OUTPUT_NODE, &OutputNode));
// Create an IMFActivate object for the renderer, based on the media type.
if (MFMediaType_Video == guidMajorType)
{
// Create the video renderer.
AXME_TRACE("Stream %d: video stream\n", streamID);
// CHECK_HR(hr = MFCreateVideoRendererActivate(hwndVideo, &pRendererActivate));
auto Sampler = MFUtils::MakeComPtr<MFVideoSampler>(this);
TComPtr<IMFMediaType>& InputType = m_videoInputType;
CHECK_HR(hr = pHandler->GetCurrentMediaType(InputType.ReleaseAndGetAddressOf()));
// Create output type
GUID SubType;
CHECK_HR(hr = InputType->GetGUID(MF_MT_SUBTYPE, &SubType));
auto strType = MFUtils::GetVideoTypeName(SubType);
AXME_TRACE("WmfMediaEngine: Input video type: %s", strType.data());
m_bIsH264 = SubType == MFVideoFormat_H264 || SubType == MFVideoFormat_H264_ES;
m_bIsHEVC = SubType == MFVideoFormat_HEVC || SubType == MFVideoFormat_HEVC_ES;
GUID VideoOutputFormat;
if ((SubType == MFVideoFormat_HEVC) || (SubType == MFVideoFormat_HEVC_ES) || (SubType == MFVideoFormat_NV12) ||
(SubType == MFVideoFormat_IYUV))
{
VideoOutputFormat = MFVideoFormat_NV12;
}
else
{
const bool Uncompressed = (SubType == MFVideoFormat_RGB555) || (SubType == MFVideoFormat_RGB565) ||
(SubType == MFVideoFormat_RGB24) || (SubType == MFVideoFormat_RGB32) ||
(SubType == MFVideoFormat_ARGB32);
VideoOutputFormat = Uncompressed ? MFVideoFormat_RGB32 : MFVideoFormat_YUY2;
}
TComPtr<IMFMediaType> OutputType;
CHECK_HR(hr = ::MFCreateMediaType(&OutputType));
CHECK_HR(hr = OutputType->SetUINT32(MF_MT_ALL_SAMPLES_INDEPENDENT, TRUE));
CHECK_HR(hr = OutputType->SetGUID(MF_MT_MAJOR_TYPE, MFMediaType_Video));
CHECK_HR(hr = OutputType->SetGUID(MF_MT_SUBTYPE, VideoOutputFormat));
CHECK_HR(hr = ::MFCreateSampleGrabberSinkActivate(OutputType.Get(), Sampler.Get(), &pRendererActivate));
m_VideoOutputFormat = VideoOutputFormat;
if (m_VideoOutputFormat == MFVideoFormat_YUY2)
m_videoPF = MEVideoPixelFormat::YUY2;
else if (m_VideoOutputFormat == MFVideoFormat_NV12)
m_videoPF = MEVideoPixelFormat::NV12;
else if (m_VideoOutputFormat == MFVideoFormat_RGB32)
m_videoPF = MEVideoPixelFormat::RGB32;
// To run as fast as possible, set this attribute (requires Windows 7):
// CHECK_HR(hr = pRendererActivate->SetUINT32(MF_SAMPLEGRABBERSINK_IGNORE_CLOCK, TRUE));
}
else if (MFMediaType_Audio == guidMajorType)
{
// Create the audio renderer.
AXME_TRACE("Stream %d: audio stream\n", streamID);
CHECK_HR(hr = MFCreateAudioRendererActivate(&pRendererActivate));
}
else
{
AXME_TRACE("Stream %d: Unknown format\n", streamID);
CHECK_HR(hr = E_FAIL);
}
// Set the IActivate object on the output node.
CHECK_HR(hr = OutputNode->SetObject(pRendererActivate.Get()));
CHECK_HR(hr = OutputNode->SetUINT32(MF_TOPONODE_STREAMID, 0));
// Return the IMFTopologyNode pointer to the caller.
*ppNode = OutputNode.Get();
(*ppNode)->AddRef();
done:
return hr;
}
HRESULT WmfMediaEngine::GetNativeVideoSize(DWORD* cx, DWORD* cy)
{
if (!m_videoInputType || !cx || !cy)
return E_POINTER;
HRESULT hr = S_OK;
UINT32 width = 0, height = 0;
MFVideoArea mfArea = {0};
do
{
BOOL bPanScan = MFGetAttributeUINT32(m_videoInputType.Get(), MF_MT_PAN_SCAN_ENABLED, FALSE);
if (bPanScan)
{
hr = m_videoInputType->GetBlob(MF_MT_PAN_SCAN_APERTURE, (UINT8*)&mfArea, sizeof(MFVideoArea), nullptr);
AX_BREAK_IF(SUCCEEDED(hr));
}
hr = m_videoInputType->GetBlob(MF_MT_MINIMUM_DISPLAY_APERTURE, (UINT8*)&mfArea, sizeof(MFVideoArea), nullptr);
AX_BREAK_IF(SUCCEEDED(hr));
hr = m_videoInputType->GetBlob(MF_MT_GEOMETRIC_APERTURE, (UINT8*)&mfArea, sizeof(MFVideoArea), nullptr);
} while (false);
if (SUCCEEDED(hr))
{
*cx = mfArea.Area.cx;
*cy = mfArea.Area.cy;
}
else // fallback to frame extent
{
*cx = m_frameExtent.x;
*cy = m_frameExtent.y;
}
return hr;
}
NS_AX_END
#endif
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