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MFMediaPlayer.cpp
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MFMediaPlayer.cpp
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//////////////////////////////////////////////////////////////////////////
//
// MFMediaPlayer.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 "MFMediaPlayer.h"
#include <Shlwapi.h>
// #pragma comment(lib, "evr") // MR_VIDEO_RENDER_SERVICE required
#pragma comment(lib, "mf")
#pragma comment(lib, "mfplat")
#pragma comment(lib, "mfplay")
#pragma comment(lib, "mfuuid")
#pragma comment(lib, "shlwapi")
// 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)
#define TRACE(...)
// Forward declarations
HRESULT CreateSourceStreamNode(IMFMediaSource* pSource,
IMFPresentationDescriptor* pSourcePD,
IMFStreamDescriptor* pSourceSD,
IMFTopologyNode** ppNode);
HRESULT CreateOutputNode(IMFStreamDescriptor* pSourceSD, HWND hwndVideo, IMFTopologyNode** ppNode);
///////////////////////////////////////////////////////////////////////
// Name: CreateInstance
// Description: Static class method to create the MFMediaPlayer object.
//
// hVideo: Handle to the video window.
// hEvent: Handle to the window to receive notifications.
// ppPlayer: Receives an AddRef's pointer to the MFMediaPlayer object.
// The caller must release the pointer.
/////////////////////////////////////////////////////////////////////////
HRESULT MFMediaPlayer::CreateInstance(HWND hEvent, MFMediaPlayer** ppPlayer)
{
TRACE((L"MFMediaPlayer::Create\n"));
assert(hEvent != NULL);
if (ppPlayer == NULL)
{
return E_POINTER;
}
HRESULT hr = S_OK;
TComPtr<MFMediaPlayer> pPlayer = new MFMediaPlayer(hEvent);
if (pPlayer == NULL)
{
return E_OUTOFMEMORY;
}
hr = pPlayer->Initialize();
if (SUCCEEDED(hr))
{
*ppPlayer = pPlayer;
(*ppPlayer)->AddRef();
}
// The MFMediaPlayer constructor sets the ref count to 1.
// If the method succeeds, the caller receives an AddRef'd pointer.
// Whether the method succeeds or fails, we must release the pointer.
// SAFE_RELEASE(pPlayer);
return hr;
}
///////////////////////////////////////////////////////////////////////
// MFMediaPlayer constructor
/////////////////////////////////////////////////////////////////////////
MFMediaPlayer::MFMediaPlayer(HWND hEvent)
: m_pSession(NULL), m_pSource(NULL), m_hwndEvent(hEvent), m_state(Ready), m_hCloseEvent(NULL), m_nRefCount(1)
{}
///////////////////////////////////////////////////////////////////////
// MFMediaPlayer destructor
/////////////////////////////////////////////////////////////////////////
MFMediaPlayer::~MFMediaPlayer()
{
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 MFMediaPlayer object. (This happens
// when MFMediaPlayer calls IMediaEventGenerator::BeginGetEvent on the
// media session.) As a result, there is a circular reference count
// between the MFMediaPlayer 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.
Shutdown();
}
//////////////////////////////////////////////////////////////////////
// Name: Initialize
// Initializes the MFMediaPlayer object. This method is called by the
// CreateInstance method.
/////////////////////////////////////////////////////////////////////////
HRESULT MFMediaPlayer::Initialize()
{
HRESULT hr = S_OK;
if (m_hCloseEvent)
{
return MF_E_ALREADY_INITIALIZED;
}
// Start up Media Foundation platform.
CHECK_HR(hr = MFStartup(MF_VERSION));
m_hCloseEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
if (m_hCloseEvent == NULL)
{
CHECK_HR(hr = HRESULT_FROM_WIN32(GetLastError()));
}
done:
return hr;
}
///////////////////////////////////////////////////////////////////////
// AddRef
/////////////////////////////////////////////////////////////////////////
ULONG MFMediaPlayer::AddRef()
{
return InterlockedIncrement(&m_nRefCount);
}
///////////////////////////////////////////////////////////////////////
// Release
/////////////////////////////////////////////////////////////////////////
ULONG MFMediaPlayer::Release()
{
ULONG uCount = InterlockedDecrement(&m_nRefCount);
if (uCount == 0)
{
delete this;
}
// For thread safety, return a temporary variable.
return uCount;
}
///////////////////////////////////////////////////////////////////////
// QueryInterface
/////////////////////////////////////////////////////////////////////////
HRESULT MFMediaPlayer::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.
/////////////////////////////////////////////////////////////////////////
HRESULT MFMediaPlayer::OpenURL(const WCHAR* sURL)
{
TRACE((L"MFMediaPlayer::OpenURL\n"));
TRACE((L"URL = %s\n", sURL));
// 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.]
HRESULT hr = S_OK;
TComPtr<IMFTopology> pTopology;
TComPtr<IMFClock> pClock;
// Create the media session.
CHECK_HR(hr = CreateSession());
// Create the media source.
CHECK_HR(hr = CreateMediaSource(sURL));
// Create a partial topology.
CHECK_HR(hr = CreateTopologyFromSource(&pTopology));
// Set the topology on the media session.
CHECK_HR(hr = m_pSession->SetTopology(0, pTopology));
// If SetTopology succeeded, the media session will queue an
// MESessionTopologySet event.
// ======> Read media properties
// Get the session capabilities.
CHECK_HR(hr = 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)
hr = m_pSession->GetClock(&pClock);
if (SUCCEEDED(hr))
CHECK_HR(hr = pClock->QueryInterface(IID_PPV_ARGS(&m_pClock)));
// Get the rate control interface (optional)
CHECK_HR(hr = MFGetService(m_pSession, MF_RATE_CONTROL_SERVICE, IID_PPV_ARGS(&m_RateControl)));
CHECK_HR(hr = MFGetService(m_pSession, MF_RATE_CONTROL_SERVICE, IID_PPV_ARGS(&m_RateSupport)));
// Check if rate 0 (scrubbing) is supported.
auto hrTmp = m_RateSupport->IsRateSupported(TRUE, 0, NULL);
if (SUCCEEDED(hrTmp))
m_bCanScrub = TRUE;
// if m_pRate is NULL, m_bCanScrub must be FALSE.
assert(m_RateControl || !m_bCanScrub);
// Set our state to "open pending"
m_state = OpenPending;
done:
if (FAILED(hr))
{
m_state = Closed;
}
// SAFE_RELEASE(pTopology);
return hr;
}
///////////////////////////////////////////////////////////////////////
// Name: Invoke
// Description: Callback for asynchronous BeginGetEvent method.
//
// pAsyncResult: Pointer to the result.
/////////////////////////////////////////////////////////////////////////
HRESULT MFMediaPlayer::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 != Closing)
{
// Leave a reference count on the event.
pEvent->AddRef();
// PostMessage(m_hwndEvent, WM_APP_PLAYER_EVENT, (WPARAM)pEvent.Get(), (LPARAM)0);
// OnPlayerEvent(hwnd, wParam);
HRESULT hr = HandleEvent((WPARAM)pEvent.Get());
}
done:
// SAFE_RELEASE(pEvent);
return S_OK;
}
//-------------------------------------------------------------------
// 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 MFMediaPlayer::HandleEvent(UINT_PTR pUnkPtr)
{
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.
TComPtr<IUnknown> pUnk{(IUnknown*)pUnkPtr};
TComPtr<IMFMediaEvent> pEvent;
PROPVARIANT var;
// pUnkPtr is really an IUnknown pointer.
// pUnk = (IUnknown*)pUnkPtr;
if (!pUnk)
{
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));
TRACE((L"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 MFMediaPlayer 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:
CHECK_HR(hr = OnPlayEnded(pEvent));
break;
case MESessionStarted:
OnSessionStart(hrStatus);
break;
case MESessionStopped:
OnSessionStop(hrStatus);
break;
case MESessionPaused:
OnSessionPause(hrStatus);
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);
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:
// SAFE_RELEASE(pUnk);
// SAFE_RELEASE(pEvent);
return hr;
}
///////////////////////////////////////////////////////////////////////
// Name: ShutDown
// Description: Releases all resources held by this object.
/////////////////////////////////////////////////////////////////////////
HRESULT MFMediaPlayer::Shutdown()
{
TRACE((L"MFMediaPlayer::ShutDown\n"));
HRESULT hr = S_OK;
// Close the session
hr = CloseSession();
// Shutdown the Media Foundation platform
MFShutdown();
if (m_hCloseEvent)
{
CloseHandle(m_hCloseEvent);
m_hCloseEvent = NULL;
}
return hr;
}
///////////////////////////////////////////////////////////////////////
// Name: GetContentProtectionManager
// Description: Returns the content protection manager object.
//
// This is a helper object for handling IMFContentEnabler operations.
/////////////////////////////////////////////////////////////////////////
// HRESULT MFMediaPlayer::GetContentProtectionManager(ContentProtectionManager **ppManager)
//{
// if (ppManager == NULL)
// {
// return E_INVALIDARG;
// }
//
// if (m_pContentProtectionManager == NULL)
// {
// return E_FAIL; // Session wasn't created yet. No helper object;
// }
//
// *ppManager = m_pContentProtectionManager;
// (*ppManager)->AddRef();
//
// return S_OK;
//
//}
///
///
/// Protected methods
///
/// All methods that follow are private to the MFMediaPlayer 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 MFMediaPlayer::OnTopologyReady(IMFMediaEvent* pEvent)
{
TRACE((L"MFMediaPlayer::OnTopologyReady\n"));
if (m_bPlayOnOpen)
StartPlayback(nullptr);
return S_OK;
}
// Starts playback.
HRESULT MFMediaPlayer::Play()
{
HRESULT hr = S_OK;
TRACE((L"MFMediaPlayer::Play\n"));
if (m_state != Paused && m_state != Stopped)
{
return MF_E_INVALIDREQUEST;
}
if (m_pSession == NULL || m_pSource == NULL)
{
return 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 hr;
}
// Pauses playback.
HRESULT MFMediaPlayer::Pause()
{
HRESULT hr = S_OK;
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 = Paused;
return hr;
}
// Stops playback.
HRESULT MFMediaPlayer::Stop()
{
HRESULT hr = S_OK;
AutoLock lock(m_critsec);
// 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;
}
return hr;
}
BOOL MFMediaPlayer::CanSeek() const
{
bool bCanSeek = (((m_caps & MFSESSIONCAP_SEEK) == MFSESSIONCAP_SEEK) && (m_hnsDuration > 0) && (m_pClock != NULL));
return bCanSeek;
}
MFTIME MFMediaPlayer::GetDuration() const
{
return m_hnsDuration;
}
MFTIME MFMediaPlayer::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 MFMediaPlayer::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 MFMediaPlayer::CanScrub() const
{
return m_bCanScrub;
}
HRESULT MFMediaPlayer::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);
}
else
{
// Leaving scrubbing mode. Restore the old rate.
if (GetNominalRate() == 0)
{
hr = SetRate(m_fPrevRate);
}
}
return hr;
}
BOOL MFMediaPlayer::CanFastForward() const
{
BOOL bCanFF = ((m_caps & MFSESSIONCAP_RATE_FORWARD) == MFSESSIONCAP_RATE_FORWARD);
return bCanFF;
}
BOOL MFMediaPlayer::CanRewind() const
{
BOOL bCanRewind = ((m_caps & MFSESSIONCAP_RATE_REVERSE) == MFSESSIONCAP_RATE_REVERSE);
return bCanRewind;
}
HRESULT MFMediaPlayer::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);
return hr;
}
HRESULT MFMediaPlayer::Rewind()
{
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);
return hr;
}
HRESULT MFMediaPlayer::SetRate(float fRate)
{
HRESULT hr = S_OK;
BOOL bThin = FALSE;
AutoLock lock(m_critsec);
if (fRate == GetNominalRate())
{
return S_OK; // no-op
}
if (m_RateSupport == NULL)
{
return 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 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 hr;
}
HRESULT MFMediaPlayer::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 = Started;
}
return hr;
}
HRESULT MFMediaPlayer::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 = Started;
return hr;
}
HRESULT MFMediaPlayer::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
hr = Stop();
if (FAILED(hr))
{
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.
hr = Pause();
if (FAILED(hr))
{
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 MFMediaPlayer::GetNominalRate() const
{
return m_request.fRate;