mfplayersession.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "private/qplatformmediaplayer_p.h"
 
#include <QtCore/qcoreapplication.h>
#include <QtCore/qdatetime.h>
#include <QtCore/qthread.h>
#include <QtCore/qvarlengtharray.h>
#include <QtCore/qdebug.h>
#include <QtCore/qfile.h>
#include <QtCore/qbuffer.h>
 
#include "private/qplatformaudiooutput_p.h"
#include "qaudiooutput.h"
 
#include "mfplayercontrol_p.h"
#include "mfvideorenderercontrol_p.h"
#include <mfmetadata_p.h>
#include <private/qwindowsaudioutils_p.h>
 
#include "mfplayersession_p.h"
#include <mferror.h>
#include <nserror.h>
#include <winerror.h>
#include "sourceresolver_p.h"
#include <wmcodecdsp.h>
 
#include <mfidl.h>
#include <mmdeviceapi.h>
#include <propvarutil.h>
#include <wininet.h>
#include <functiondiscoverykeys_devpkey.h>
 
//#define DEBUG_MEDIAFOUNDATION
 
QT_BEGIN_NAMESPACE
 
MFPlayerSession::MFPlayerSession(MFPlayerControl *playerControl)
    : m_cRef(1),
      m_playerControl(playerControl),
      m_scrubbing(false),
      m_restoreRate(1),
      m_closing(false),
      m_mediaTypes(0),
      m_pendingRate(1)
 
{
    connect(this, &MFPlayerSession::sessionEvent, this, &MFPlayerSession::handleSessionEvent);
 
    m_signalPositionChangeTimer.setInterval(10);
    m_signalPositionChangeTimer.setTimerType(Qt::PreciseTimer);
    m_signalPositionChangeTimer.callOnTimeout(this, &MFPlayerSession::timeout);
 
    m_pendingState = NoPending;
    ZeroMemory(&m_state, sizeof(m_state));
    m_state.command = CmdStop;
    m_state.prevCmd = CmdNone;
    m_state.rate = 1.0f;
    ZeroMemory(&m_request, sizeof(m_request));
    m_request.command = CmdNone;
    m_request.prevCmd = CmdNone;
    m_request.rate = 1.0f;
 
    m_videoRendererControl = new MFVideoRendererControl(this);
}
 
void MFPlayerSession::timeout()
{
    const qint64 pos = position();
 
    if (pos != m_lastPosition) {
        const bool updatePos = m_timeCounter++ % 10 == 0;
        if (pos >= qint64(m_duration / 10000 - 20)) {
            if (m_playerControl->doLoop()) {
                m_session->Pause();
                setPosition(0);
                positionChanged(0);
            } else {
                if (updatePos)
                    positionChanged(pos);
            }
        } else {
            if (updatePos)
                positionChanged(pos);
        }
        m_lastPosition = pos;
    }
}
 
void MFPlayerSession::close()
{
#ifdef DEBUG_MEDIAFOUNDATION
    qDebug() << "close";
#endif
 
    m_signalPositionChangeTimer.stop();
    clear();
    if (!m_session)
        return;
 
    HRESULT hr = S_OK;
    if (m_session) {
        m_closing = true;
        hr = m_session->Close();
        if (SUCCEEDED(hr)) {
            DWORD dwWaitResult = WaitForSingleObject(m_hCloseEvent.get(), 2000);
            if (dwWaitResult == WAIT_TIMEOUT) {
                qWarning() << "session close time out!";
            }
        }
         m_closing = false;
    }
 
    if (SUCCEEDED(hr)) {
        if (m_session)
            m_session->Shutdown();
        if (m_sourceResolver)
            m_sourceResolver->shutdown();
    }
    m_sourceResolver.Reset();
 
    m_videoRendererControl->releaseActivate();
//    } else if (m_playerService->videoWindowControl()) {
//        m_playerService->videoWindowControl()->releaseActivate();
//    }
 
    m_session.Reset();
    m_hCloseEvent = {};
    m_lastPosition = -1;
    m_position = 0;
}
 
void MFPlayerSession::load(const QUrl &url, QIODevice *stream)
{
#ifdef DEBUG_MEDIAFOUNDATION
    qDebug() << "load";
#endif
    clear();
 
    if (status() == QMediaPlayer::LoadingMedia && m_sourceResolver)
        m_sourceResolver->cancel();
 
    if (url.isEmpty() && !stream) {
        close();
        changeStatus(QMediaPlayer::NoMedia);
    } else if (stream && (!stream->isReadable())) {
        close();
        changeStatus(QMediaPlayer::InvalidMedia);
        error(QMediaPlayer::ResourceError, tr("Invalid stream source."), true);
    } else if (createSession()) {
        changeStatus(QMediaPlayer::LoadingMedia);
        m_sourceResolver->load(url, stream);
        if (url.isLocalFile())
            m_updateRoutingOnStart = true;
    }
    positionChanged(position());
}
 
void MFPlayerSession::handleSourceError(long hr)
{
    QString errorString;
    QMediaPlayer::Error errorCode = QMediaPlayer::ResourceError;
    switch (hr) {
    case QMediaPlayer::FormatError:
        errorCode = QMediaPlayer::FormatError;
        errorString = tr("Attempting to play invalid Qt resource.");
        break;
    case NS_E_FILE_NOT_FOUND:
        errorString = tr("The system cannot find the file specified.");
        break;
    case NS_E_SERVER_NOT_FOUND:
        errorString = tr("The specified server could not be found.");
        break;
    case MF_E_UNSUPPORTED_BYTESTREAM_TYPE:
        errorCode = QMediaPlayer::FormatError;
        errorString = tr("Unsupported media type.");
        break;
    case MF_E_UNSUPPORTED_SCHEME:
        errorCode = QMediaPlayer::ResourceError;
        errorString = tr("Unsupported URL scheme.");
        break;
    case INET_E_CANNOT_CONNECT:
        errorCode = QMediaPlayer::NetworkError;
        errorString = tr("Connection to server could not be established.");
        break;
    default:
        qWarning() << "handleSourceError:"
                   << Qt::showbase << Qt::hex << Qt::uppercasedigits << static_cast<quint32>(hr);
        errorString = tr("Failed to load source.");
        break;
    }
    changeStatus(QMediaPlayer::InvalidMedia);
    error(errorCode, errorString, true);
}
 
void MFPlayerSession::handleMediaSourceReady()
{
    if (QMediaPlayer::LoadingMedia != status() || !m_sourceResolver
        || m_sourceResolver.Get() != sender())
        return;
#ifdef DEBUG_MEDIAFOUNDATION
    qDebug() << "handleMediaSourceReady";
#endif
    HRESULT hr = S_OK;
    IMFMediaSource* mediaSource = m_sourceResolver->mediaSource();
 
    DWORD dwCharacteristics = 0;
    mediaSource->GetCharacteristics(&dwCharacteristics);
    seekableUpdate(MFMEDIASOURCE_CAN_SEEK & dwCharacteristics);
 
    ComPtr<IMFPresentationDescriptor> sourcePD;
    hr = mediaSource->CreatePresentationDescriptor(&sourcePD);
    if (SUCCEEDED(hr)) {
        m_duration = 0;
        m_metaData = MFMetaData::fromNative(mediaSource);
        metaDataChanged();
        sourcePD->GetUINT64(MF_PD_DURATION, &m_duration);
        //convert from 100 nanosecond to milisecond
        durationUpdate(qint64(m_duration / 10000));
        setupPlaybackTopology(mediaSource, sourcePD.Get());
        tracksChanged();
    } else {
        changeStatus(QMediaPlayer::InvalidMedia);
        error(QMediaPlayer::ResourceError, tr("Cannot create presentation descriptor."), true);
    }
}
 
bool MFPlayerSession::getStreamInfo(IMFStreamDescriptor *stream,
                                    MFPlayerSession::MediaType *type,
                                    QString *name,
                                    QString *language,
                                    GUID *format) const
{
    if (!stream || !type || !name || !language || !format)
        return false;
 
    *type = Unknown;
    *name = QString();
    *language = QString();
 
    ComPtr<IMFMediaTypeHandler> typeHandler;
 
    if (SUCCEEDED(stream->GetMediaTypeHandler(&typeHandler))) {
 
        UINT32 len = 0;
        if (SUCCEEDED(stream->GetStringLength(MF_SD_STREAM_NAME, &len)) && len > 0) {
            WCHAR *wstr = new WCHAR[len+1];
            if (SUCCEEDED(stream->GetString(MF_SD_STREAM_NAME, wstr, len + 1, &len))) {
                *name = QString::fromUtf16(reinterpret_cast<const char16_t *>(wstr));
            }
            delete []wstr;
        }
        if (SUCCEEDED(stream->GetStringLength(MF_SD_LANGUAGE, &len)) && len > 0) {
            WCHAR *wstr = new WCHAR[len+1];
            if (SUCCEEDED(stream->GetString(MF_SD_LANGUAGE, wstr, len + 1, &len))) {
                *language = QString::fromUtf16(reinterpret_cast<const char16_t *>(wstr));
            }
            delete []wstr;
        }
 
        GUID guidMajorType;
        if (SUCCEEDED(typeHandler->GetMajorType(&guidMajorType))) {
            if (guidMajorType == MFMediaType_Audio)
                *type = Audio;
            else if (guidMajorType == MFMediaType_Video)
                *type = Video;
        }
 
        ComPtr<IMFMediaType> mediaType;
        if (SUCCEEDED(typeHandler->GetCurrentMediaType(&mediaType))) {
            mediaType->GetGUID(MF_MT_SUBTYPE, format);
        }
    }
 
    return *type != Unknown;
}
 
void MFPlayerSession::setupPlaybackTopology(IMFMediaSource *source, IMFPresentationDescriptor *sourcePD)
{
    HRESULT hr = S_OK;
    // Get the number of streams in the media source.
    DWORD cSourceStreams = 0;
    hr = sourcePD->GetStreamDescriptorCount(&cSourceStreams);
    if (FAILED(hr)) {
        changeStatus(QMediaPlayer::InvalidMedia);
        error(QMediaPlayer::ResourceError, tr("Failed to get stream count."), true);
        return;
    }
 
    ComPtr<IMFTopology> topology;
    hr = MFCreateTopology(&topology);
    if (FAILED(hr)) {
        changeStatus(QMediaPlayer::InvalidMedia);
        error(QMediaPlayer::ResourceError, tr("Failed to create topology."), true);
        return;
    }
 
    // For each stream, create the topology nodes and add them to the topology.
    DWORD succeededCount = 0;
    for (DWORD i = 0; i < cSourceStreams; i++) {
        BOOL selected = FALSE;
        bool streamAdded = false;
        ComPtr<IMFStreamDescriptor> streamDesc;
 
        HRESULT hr = sourcePD->GetStreamDescriptorByIndex(i, &selected, &streamDesc);
        if (SUCCEEDED(hr)) {
            // The media might have multiple audio and video streams,
            // only use one of each kind, and only if it is selected by default.
            MediaType mediaType = Unknown;
            QString streamName;
            QString streamLanguage;
            GUID format = GUID_NULL;
 
            if (getStreamInfo(streamDesc.Get(), &mediaType, &streamName, &streamLanguage,
                              &format)) {
 
                QPlatformMediaPlayer::TrackType trackType = (mediaType == Audio) ?
                            QPlatformMediaPlayer::AudioStream : QPlatformMediaPlayer::VideoStream;
 
                QLocale::Language lang = streamLanguage.isEmpty() ?
                            QLocale::Language::AnyLanguage : QLocale(streamLanguage).language();
 
                QMediaMetaData metaData;
                metaData.insert(QMediaMetaData::Title, streamName);
                metaData.insert(QMediaMetaData::Language, lang);
 
                m_trackInfo[trackType].metaData.append(metaData);
                m_trackInfo[trackType].nativeIndexes.append(i);
                m_trackInfo[trackType].format = format;
 
                if (((m_mediaTypes & mediaType) == 0) && selected) { // Check if this type isn't already added
                    ComPtr<IMFTopologyNode> sourceNode =
                            addSourceNode(topology.Get(), source, sourcePD, streamDesc.Get());
                    if (sourceNode) {
                        ComPtr<IMFTopologyNode> outputNode =
                                addOutputNode(mediaType, topology.Get(), 0);
                        if (outputNode) {
                            sourceNode->GetTopoNodeID(&m_trackInfo[trackType].sourceNodeId);
                            outputNode->GetTopoNodeID(&m_trackInfo[trackType].outputNodeId);
 
                            hr = sourceNode->ConnectOutput(0, outputNode.Get(), 0);
 
                            if (FAILED(hr)) {
                                error(QMediaPlayer::FormatError, tr("Unable to play any stream."), false);
                            } else {
                                m_trackInfo[trackType].currentIndex = m_trackInfo[trackType].nativeIndexes.count() - 1;
                                streamAdded = true;
                                succeededCount++;
                                m_mediaTypes |= mediaType;
                                switch (mediaType) {
                                case Audio:
                                    audioAvailable();
                                    break;
                                case Video:
                                    videoAvailable();
                                    break;
                                default:
                                    break;
                                }
                            }
                        } else {
                            // remove the source node if the output node cannot be created
                            topology->RemoveNode(sourceNode.Get());
                        }
                    }
                }
            }
 
            if (selected && !streamAdded)
                sourcePD->DeselectStream(i);
        }
    }
 
    if (succeededCount == 0) {
        changeStatus(QMediaPlayer::InvalidMedia);
        error(QMediaPlayer::ResourceError, tr("Unable to play."), true);
    } else {
        if (m_trackInfo[QPlatformMediaPlayer::VideoStream].outputNodeId != TOPOID(-1))
            topology = insertMFT(topology, m_trackInfo[QPlatformMediaPlayer::VideoStream].outputNodeId);
 
        hr = m_session->SetTopology(MFSESSION_SETTOPOLOGY_IMMEDIATE, topology.Get());
        if (SUCCEEDED(hr)) {
            m_updatingTopology = true;
        } else {
            changeStatus(QMediaPlayer::InvalidMedia);
            error(QMediaPlayer::ResourceError, tr("Failed to set topology."), true);
        }
    }
}
 
ComPtr<IMFTopologyNode> MFPlayerSession::addSourceNode(IMFTopology *topology,
                                                       IMFMediaSource *source,
                                                       IMFPresentationDescriptor *presentationDesc,
                                                       IMFStreamDescriptor *streamDesc)
{
    ComPtr<IMFTopologyNode> node;
    HRESULT hr = MFCreateTopologyNode(MF_TOPOLOGY_SOURCESTREAM_NODE, &node);
    if (SUCCEEDED(hr)) {
        hr = node->SetUnknown(MF_TOPONODE_SOURCE, source);
        if (SUCCEEDED(hr)) {
            hr = node->SetUnknown(MF_TOPONODE_PRESENTATION_DESCRIPTOR, presentationDesc);
            if (SUCCEEDED(hr)) {
                hr = node->SetUnknown(MF_TOPONODE_STREAM_DESCRIPTOR, streamDesc);
                if (SUCCEEDED(hr)) {
                    hr = topology->AddNode(node.Get());
                    if (SUCCEEDED(hr))
                        return node;
                }
            }
        }
    }
    return NULL;
}
 
ComPtr<IMFTopologyNode> MFPlayerSession::addOutputNode(MediaType mediaType, IMFTopology *topology,
                                                       DWORD sinkID)
{
    ComPtr<IMFTopologyNode> node;
    if (FAILED(MFCreateTopologyNode(MF_TOPOLOGY_OUTPUT_NODE, &node)))
        return NULL;
 
    ComPtr<IMFActivate> activate;
    if (mediaType == Audio) {
        if (m_audioOutput) {
            auto id = m_audioOutput->device.id();
            if (id.isEmpty()) {
                qInfo() << "No audio output";
                return NULL;
            }
 
            HRESULT hr = MFCreateAudioRendererActivate(&activate);
            if (FAILED(hr)) {
                qWarning() << "Failed to create audio renderer activate";
                return NULL;
            }
 
            QString s = QString::fromUtf8(id);
            hr = activate->SetString(MF_AUDIO_RENDERER_ATTRIBUTE_ENDPOINT_ID, (LPCWSTR)s.utf16());
            if (FAILED(hr)) {
                qWarning() << "Failed to set attribute for audio device"
                           << m_audioOutput->device.description();
                return NULL;
            }
        }
    } else if (mediaType == Video) {
        activate = m_videoRendererControl->createActivate();
 
        QSize resolution = m_metaData.value(QMediaMetaData::Resolution).toSize();
 
        if (resolution.isValid())
            m_videoRendererControl->setCropRect(QRect(QPoint(), resolution));
 
    } else {
        // Unknown stream type.
        error(QMediaPlayer::FormatError, tr("Unknown stream type."), false);
    }
 
    if (!activate || FAILED(node->SetObject(activate.Get()))
        || FAILED(node->SetUINT32(MF_TOPONODE_STREAMID, sinkID))
        || FAILED(node->SetUINT32(MF_TOPONODE_NOSHUTDOWN_ON_REMOVE, FALSE))
        || FAILED(topology->AddNode(node.Get()))) {
        node.Reset();
    }
 
    if (activate && mediaType == Audio)
        activate.Reset();
 
    return node;
}
 
// BindOutputNode
// Sets the IMFStreamSink pointer on an output node.
// IMFActivate pointer in the output node must be converted to an
// IMFStreamSink pointer before the topology loader resolves the topology.
HRESULT BindOutputNode(IMFTopologyNode *pNode)
{
    ComPtr<IUnknown> nodeObject;
    ComPtr<IMFActivate> activate;
    ComPtr<IMFStreamSink> stream;
    ComPtr<IMFMediaSink> sink;
 
    HRESULT hr = pNode->GetObject(&nodeObject);
    if (FAILED(hr))
        return hr;
 
    hr = nodeObject->QueryInterface(IID_PPV_ARGS(&activate));
    if (SUCCEEDED(hr)) {
        DWORD dwStreamID = 0;
 
        // Try to create the media sink.
        hr = activate->ActivateObject(IID_PPV_ARGS(&sink));
        if (SUCCEEDED(hr))
           dwStreamID = MFGetAttributeUINT32(pNode, MF_TOPONODE_STREAMID, 0);
 
        if (SUCCEEDED(hr)) {
            // First check if the media sink already has a stream sink with the requested ID.
            hr = sink->GetStreamSinkById(dwStreamID, &stream);
            if (FAILED(hr)) {
                // Create the stream sink.
                hr = sink->AddStreamSink(dwStreamID, NULL, &stream);
            }
        }
 
        // Replace the node's object pointer with the stream sink.
        if (SUCCEEDED(hr)) {
            hr = pNode->SetObject(stream.Get());
        }
    } else {
        hr = nodeObject->QueryInterface(IID_PPV_ARGS(&stream));
    }
 
    return hr;
}
 
// BindOutputNodes
// Sets the IMFStreamSink pointers on all of the output nodes in a topology.
HRESULT BindOutputNodes(IMFTopology *pTopology)
{
    ComPtr<IMFCollection> collection;
 
    // Get the collection of output nodes.
    HRESULT hr = pTopology->GetOutputNodeCollection(&collection);
 
    // Enumerate all of the nodes in the collection.
    if (SUCCEEDED(hr)) {
        DWORD cNodes;
        hr = collection->GetElementCount(&cNodes);
 
        if (SUCCEEDED(hr)) {
            for (DWORD i = 0; i < cNodes; i++) {
                ComPtr<IUnknown> element;
                hr = collection->GetElement(i, &element);
                if (FAILED(hr))
                    break;
 
                ComPtr<IMFTopologyNode> node;
                hr = element->QueryInterface(IID_IMFTopologyNode, &node);
                if (FAILED(hr))
                    break;
 
                // Bind this node.
                hr = BindOutputNode(node.Get());
                if (FAILED(hr))
                    break;
            }
        }
    }
 
    return hr;
}
 
// This method binds output nodes to complete the topology,
// then loads the topology and inserts MFT between the output node
// and a filter connected to the output node.
ComPtr<IMFTopology> MFPlayerSession::insertMFT(const ComPtr<IMFTopology> &topology,
                                               TOPOID outputNodeId)
{
    bool isNewTopology = false;
 
    ComPtr<IMFTopoLoader> topoLoader;
    ComPtr<IMFTopology> resolvedTopology;
    ComPtr<IMFCollection> outputNodes;
 
    do {
        if (FAILED(BindOutputNodes(topology.Get())))
            break;
 
        if (FAILED(MFCreateTopoLoader(&topoLoader)))
            break;
 
        if (FAILED(topoLoader->Load(topology.Get(), &resolvedTopology, NULL))) {
            // Topology could not be resolved, adding ourselves a color converter
            // to the topology might solve the problem
            insertColorConverter(topology.Get(), outputNodeId);
            if (FAILED(topoLoader->Load(topology.Get(), &resolvedTopology, NULL)))
                break;
        }
 
        if (insertResizer(resolvedTopology.Get()))
            isNewTopology = true;
    } while (false);
 
    if (isNewTopology) {
        return resolvedTopology;
    }
 
    return topology;
}
 
// This method checks if the topology contains a color converter transform (CColorConvertDMO),
// if it does it inserts a resizer transform (CResizerDMO) to handle dynamic frame size change
// of the video stream.
// Returns true if it inserted a resizer
bool MFPlayerSession::insertResizer(IMFTopology *topology)
{
    bool inserted = false;
    WORD elementCount = 0;
    ComPtr<IMFTopologyNode> node;
    ComPtr<IUnknown> object;
    ComPtr<IWMColorConvProps> colorConv;
    ComPtr<IMFTransform> resizer;
    ComPtr<IMFTopologyNode> resizerNode;
    ComPtr<IMFTopologyNode> inputNode;
 
    HRESULT hr = topology->GetNodeCount(&elementCount);
    if (FAILED(hr))
        return false;
 
    for (WORD i = 0; i < elementCount; ++i) {
        node.Reset();
        object.Reset();
 
        if (FAILED(topology->GetNode(i, &node)))
            break;
 
        MF_TOPOLOGY_TYPE nodeType;
        if (FAILED(node->GetNodeType(&nodeType)))
            break;
 
        if (nodeType != MF_TOPOLOGY_TRANSFORM_NODE)
            continue;
 
        if (FAILED(node->GetObject(&object)))
            break;
 
        if (FAILED(object->QueryInterface(IID_PPV_ARGS(&colorConv))))
            continue;
 
        if (FAILED(CoCreateInstance(CLSID_CResizerDMO, NULL, CLSCTX_INPROC_SERVER, IID_IMFTransform,
                                    &resizer)))
            break;
 
        if (FAILED(MFCreateTopologyNode(MF_TOPOLOGY_TRANSFORM_NODE, &resizerNode)))
            break;
 
        if (FAILED(resizerNode->SetObject(resizer.Get())))
            break;
 
        if (FAILED(topology->AddNode(resizerNode.Get())))
            break;
 
        DWORD outputIndex = 0;
        if (FAILED(node->GetInput(0, &inputNode, &outputIndex))) {
            topology->RemoveNode(resizerNode.Get());
            break;
        }
 
        if (FAILED(inputNode->ConnectOutput(0, resizerNode.Get(), 0))) {
            topology->RemoveNode(resizerNode.Get());
            break;
        }
 
        if (FAILED(resizerNode->ConnectOutput(0, node.Get(), 0))) {
            inputNode->ConnectOutput(0, node.Get(), 0);
            topology->RemoveNode(resizerNode.Get());
            break;
        }
 
        inserted = true;
        break;
    }
 
    return inserted;
}
 
// This method inserts a color converter (CColorConvertDMO) in the topology,
// typically to convert to RGB format.
// Usually this converter is automatically inserted when the topology is resolved but
// for some reason it fails to do so in some cases, we then do it ourselves.
void MFPlayerSession::insertColorConverter(IMFTopology *topology, TOPOID outputNodeId)
{
    ComPtr<IMFCollection> outputNodes;
 
    if (FAILED(topology->GetOutputNodeCollection(&outputNodes)))
        return;
 
    DWORD elementCount = 0;
    if (FAILED(outputNodes->GetElementCount(&elementCount)))
        return;
 
    for (DWORD n = 0; n < elementCount; n++) {
        ComPtr<IUnknown> element;
        ComPtr<IMFTopologyNode> node;
        ComPtr<IMFTopologyNode> inputNode;
        ComPtr<IMFTopologyNode> mftNode;
        ComPtr<IMFTransform> converter;
 
        do {
            if (FAILED(outputNodes->GetElement(n, &element)))
                break;
 
            if (FAILED(element->QueryInterface(IID_IMFTopologyNode, &node)))
                break;
 
            TOPOID id;
            if (FAILED(node->GetTopoNodeID(&id)))
                break;
 
            if (id != outputNodeId)
                break;
 
            DWORD outputIndex = 0;
            if (FAILED(node->GetInput(0, &inputNode, &outputIndex)))
                break;
 
            if (FAILED(MFCreateTopologyNode(MF_TOPOLOGY_TRANSFORM_NODE, &mftNode)))
                break;
 
            if (FAILED(CoCreateInstance(CLSID_CColorConvertDMO, NULL, CLSCTX_INPROC_SERVER,
                                        IID_IMFTransform, &converter)))
                break;
 
            if (FAILED(mftNode->SetObject(converter.Get())))
                break;
 
            if (FAILED(topology->AddNode(mftNode.Get())))
                break;
 
            if (FAILED(inputNode->ConnectOutput(0, mftNode.Get(), 0)))
                break;
 
            if (FAILED(mftNode->ConnectOutput(0, node.Get(), 0)))
                break;
 
        } while (false);
    }
}
 
void MFPlayerSession::stop(bool immediate)
{
#ifdef DEBUG_MEDIAFOUNDATION
    qDebug() << "stop";
#endif
    if (!immediate && m_pendingState != NoPending) {
        m_request.setCommand(CmdStop);
    } else {
        if (m_state.command == CmdStop)
            return;
 
        if (m_scrubbing)
            scrub(false);
 
        if (SUCCEEDED(m_session->Stop())) {
 
            m_state.setCommand(CmdStop);
            m_pendingState = CmdPending;
            if (status() != QMediaPlayer::EndOfMedia) {
                m_position = 0;
                positionChanged(0);
            }
        } else {
            error(QMediaPlayer::ResourceError, tr("Failed to stop."), true);
        }
    }
}
 
void MFPlayerSession::start()
{
    if (status() == QMediaPlayer::LoadedMedia && m_updateRoutingOnStart) {
        m_updateRoutingOnStart = false;
        updateOutputRouting();
    }
 
    if (status() == QMediaPlayer::EndOfMedia) {
        m_position = 0; // restart from the beginning
        positionChanged(0);
    }
 
#ifdef DEBUG_MEDIAFOUNDATION
    qDebug() << "start";
#endif
 
    if (m_pendingState != NoPending) {
        m_request.setCommand(CmdStart);
    } else {
        if (m_state.command == CmdStart)
            return;
 
        if (m_scrubbing) {
            scrub(false);
            m_position = position() * 10000;
        }
 
        if (m_restorePosition >= 0) {
            m_position = m_restorePosition;
            if (!m_updatingTopology)
                m_restorePosition = -1;
        }
 
        PROPVARIANT varStart;
        InitPropVariantFromInt64(m_position, &varStart);
 
        if (SUCCEEDED(m_session->Start(&GUID_NULL, &varStart))) {
            m_state.setCommand(CmdStart);
            m_pendingState = CmdPending;
        } else {
            error(QMediaPlayer::ResourceError, tr("failed to start playback"), true);
        }
        PropVariantClear(&varStart);
    }
}
 
void MFPlayerSession::pause()
{
#ifdef DEBUG_MEDIAFOUNDATION
    qDebug() << "pause";
#endif
    if (m_pendingState != NoPending) {
        m_request.setCommand(CmdPause);
    } else {
        if (m_state.command == CmdPause)
            return;
 
        if (SUCCEEDED(m_session->Pause())) {
            m_state.setCommand(CmdPause);
            m_pendingState = CmdPending;
        } else {
            error(QMediaPlayer::ResourceError, tr("Failed to pause."), false);
        }
        if (status() == QMediaPlayer::EndOfMedia) {
            setPosition(0);
            positionChanged(0);
        }
    }
}
 
void MFPlayerSession::changeStatus(QMediaPlayer::MediaStatus newStatus)
{
    if (!m_playerControl)
        return;
#ifdef DEBUG_MEDIAFOUNDATION
    qDebug() << "MFPlayerSession::changeStatus" << newStatus;
#endif
    // notify the control to run its session-specific handling
    statusChanged(newStatus);
}
 
QMediaPlayer::MediaStatus MFPlayerSession::status() const
{
    if (!m_playerControl)
        return QMediaPlayer::NoMedia;
    return m_playerControl->mediaStatus();
}
 
bool MFPlayerSession::createSession()
{
    close();
 
    Q_ASSERT(m_session == NULL);
 
    HRESULT hr = MFCreateMediaSession(NULL, &m_session);
    if (FAILED(hr)) {
        changeStatus(QMediaPlayer::InvalidMedia);
        error(QMediaPlayer::ResourceError, tr("Unable to create mediasession."), true);
        return false;
    }
 
    m_hCloseEvent = EventHandle{ CreateEvent(NULL, FALSE, FALSE, NULL) };
 
    hr = m_session->BeginGetEvent(this, m_session.Get());
    if (FAILED(hr)) {
        changeStatus(QMediaPlayer::InvalidMedia);
        error(QMediaPlayer::ResourceError, tr("Unable to pull session events."), false);
        close();
        return false;
    }
 
    m_sourceResolver = makeComObject<SourceResolver>();
    QObject::connect(m_sourceResolver.Get(), &SourceResolver::mediaSourceReady, this,
                     &MFPlayerSession::handleMediaSourceReady);
    QObject::connect(m_sourceResolver.Get(), &SourceResolver::error, this,
                     &MFPlayerSession::handleSourceError);
 
    m_position = 0;
    return true;
}
 
qint64 MFPlayerSession::position()
{
    if (m_request.command == CmdSeek || m_request.command == CmdSeekResume)
        return m_request.start;
 
    if (m_pendingState == SeekPending)
        return m_state.start;
 
    if (m_state.command == CmdStop)
        return m_position / 10000;
 
    if (m_presentationClock) {
        MFTIME time, sysTime;
        if (FAILED(m_presentationClock->GetCorrelatedTime(0, &time, &sysTime)))
            return m_position / 10000;
        return qint64(time / 10000);
    }
    return m_position / 10000;
}
 
void MFPlayerSession::setPosition(qint64 position)
{
#ifdef DEBUG_MEDIAFOUNDATION
    qDebug() << "setPosition";
#endif
    if (m_pendingState != NoPending) {
        m_request.setCommand(CmdSeek);
        m_request.start = position;
    } else {
        setPositionInternal(position, CmdNone);
    }
}
 
void MFPlayerSession::setPositionInternal(qint64 position, Command requestCmd)
{
    if (status() == QMediaPlayer::EndOfMedia)
        changeStatus(QMediaPlayer::LoadedMedia);
    if (m_state.command == CmdStop && requestCmd != CmdSeekResume) {
        m_position = position * 10000;
        // Even though the position is not actually set on the session yet,
        // report it to have changed anyway for UI controls to be updated
        positionChanged(this->position());
        return;
    }
 
    if (m_state.command == CmdPause)
        scrub(true);
 
#ifdef DEBUG_MEDIAFOUNDATION
    qDebug() << "setPositionInternal";
#endif
 
    PROPVARIANT varStart;
    varStart.vt = VT_I8;
    varStart.hVal.QuadPart = LONGLONG(position * 10000);
    if (SUCCEEDED(m_session->Start(NULL, &varStart))) {
        PropVariantClear(&varStart);
        // Store the pending state.
        m_state.setCommand(CmdStart);
        m_state.start = position;
        m_pendingState = SeekPending;
    } else {
        error(QMediaPlayer::ResourceError, tr("Failed to seek."), true);
    }
}
 
qreal MFPlayerSession::playbackRate() const
{
    if (m_scrubbing)
        return m_restoreRate;
    return m_state.rate;
}
 
void MFPlayerSession::setPlaybackRate(qreal rate)
{
    if (m_scrubbing) {
        m_restoreRate = rate;
        playbackRateChanged(rate);
        return;
    }
    setPlaybackRateInternal(rate);
}
 
void MFPlayerSession::setPlaybackRateInternal(qreal rate)
{
    if (rate == m_request.rate)
        return;
 
    m_pendingRate = rate;
    if (!m_rateSupport)
        return;
 
#ifdef DEBUG_MEDIAFOUNDATION
    qDebug() << "setPlaybackRate";
#endif
    BOOL isThin = FALSE;
 
    //from MSDN http://msdn.microsoft.com/en-us/library/aa965220%28v=vs.85%29.aspx
    //Thinning applies primarily to video streams.
    //In thinned mode, the source drops delta frames and deliver only key frames.
    //At very high playback rates, the source might skip some key frames (for example, deliver every other key frame).
 
    if (FAILED(m_rateSupport->IsRateSupported(FALSE, rate, NULL))) {
        isThin = TRUE;
        if (FAILED(m_rateSupport->IsRateSupported(isThin, rate, NULL))) {
            qWarning() << "unable to set playbackrate = " << rate;
            m_pendingRate = m_request.rate = m_state.rate;
            return;
        }
    }
    if (m_pendingState != NoPending) {
        m_request.rate = rate;
        m_request.isThin = isThin;
        // 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.setCommand(m_state.command);
    } else {
        //No pending operation. Commit the new rate.
        commitRateChange(rate, isThin);
    }
}
 
void MFPlayerSession::commitRateChange(qreal rate, BOOL isThin)
{
#ifdef DEBUG_MEDIAFOUNDATION
    qDebug() << "commitRateChange";
#endif
    Q_ASSERT(m_pendingState == NoPending);
    MFTIME  hnsSystemTime = 0;
    MFTIME  hnsClockTime = 0;
    Command cmdNow = m_state.command;
    bool resetPosition = false;
    // Allowed rate transitions:
    // Positive <-> negative:   Stopped
    // Negative <-> zero:       Stopped
    // Postive <-> zero:        Paused or stopped
    if ((rate > 0 && m_state.rate <= 0) || (rate < 0 && m_state.rate >= 0)) {
        if (cmdNow == CmdStart) {
            // Get the current clock position. This will be the restart time.
            m_presentationClock->GetCorrelatedTime(0, &hnsClockTime, &hnsSystemTime);
            Q_ASSERT(hnsSystemTime != 0);
 
            if (rate < 0 || m_state.rate < 0)
                m_request.setCommand(CmdSeekResume);
            else if (isThin || m_state.isThin)
                m_request.setCommand(CmdStartAndSeek);
            else
                m_request.setCommand(CmdStart);
 
            // We need to stop only when dealing with negative rates
            if (rate >= 0 && m_state.rate >= 0)
                pause();
            else
                stop();
 
            // If we deal with negative rates, we stopped the session and consequently
            // reset the position to zero. We then need to resume to the current position.
            m_request.start = hnsClockTime / 10000;
        } else if (cmdNow == CmdPause) {
            if (rate < 0 || m_state.rate < 0) {
                // 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.
                qWarning() << "Unable to change rate from positive to negative or vice versa in paused state";
                rate = m_state.rate;
                isThin = m_state.isThin;
                goto done;
            }
 
            // This happens when resuming playback after scrubbing in pause mode.
            // This transition requires the session to be paused. Even though our
            // internal state is set to paused, the session might not be so we need
            // to enforce it
            if (rate > 0 && m_state.rate == 0) {
                m_state.setCommand(CmdNone);
                pause();
            }
        }
    } else if (rate == 0 && m_state.rate > 0) {
        if (cmdNow != CmdPause) {
            // Transition to paused.
            // This transisition requires the paused state.
            // Pause and set the rate.
            pause();
 
            // Request: Switch back to current state.
            m_request.setCommand(cmdNow);
        }
    } else if (rate == 0 && m_state.rate < 0) {
        // Changing rate from negative to zero requires to stop the session
        m_presentationClock->GetCorrelatedTime(0, &hnsClockTime, &hnsSystemTime);
 
        m_request.setCommand(CmdSeekResume);
 
        stop();
 
        // Resume to the current position (stop() will reset the position to 0)
        m_request.start = hnsClockTime / 10000;
    } else if (!isThin && m_state.isThin) {
        if (cmdNow == CmdStart) {
            // When thinning, only key frames are read and presented. Going back
            // to normal playback requires to reset the current position to force
            // the pipeline to decode the actual frame at the current position
            // (which might be earlier than the last decoded key frame)
            resetPosition = true;
        } else if (cmdNow == CmdPause) {
            // If paused, don't reset the position until we resume, otherwise
            // a new frame will be rendered
            m_presentationClock->GetCorrelatedTime(0, &hnsClockTime, &hnsSystemTime);
            m_request.setCommand(CmdSeekResume);
            m_request.start = hnsClockTime / 10000;
        }
 
    }
 
    // Set the rate.
    if (FAILED(m_rateControl->SetRate(isThin, rate))) {
        qWarning() << "failed to set playbackrate = " << rate;
        rate = m_state.rate;
        isThin = m_state.isThin;
        goto done;
    }
 
    if (resetPosition) {
        m_presentationClock->GetCorrelatedTime(0, &hnsClockTime, &hnsSystemTime);
        setPosition(hnsClockTime / 10000);
    }
 
done:
    // Adjust our current rate and requested rate.
    m_pendingRate = m_request.rate = m_state.rate = rate;
    if (rate != 0)
        m_state.isThin = isThin;
    playbackRateChanged(rate);
}
 
void MFPlayerSession::scrub(bool enableScrub)
{
    if (m_scrubbing == enableScrub)
        return;
 
    m_scrubbing = enableScrub;
 
    if (!canScrub()) {
        if (!enableScrub)
            m_pendingRate = m_restoreRate;
        return;
    }
 
    if (enableScrub)  {
        // Enter scrubbing mode. Cache the rate.
        m_restoreRate = m_request.rate;
        setPlaybackRateInternal(0.0f);
    } else {
        // Leaving scrubbing mode. Restore the old rate.
        setPlaybackRateInternal(m_restoreRate);
    }
}
 
void MFPlayerSession::setVolume(float volume)
{
    if (m_volume == volume)
        return;
    m_volume = volume;
 
    if (!m_muted)
        setVolumeInternal(volume);
}
 
void MFPlayerSession::setMuted(bool muted)
{
    if (m_muted == muted)
        return;
    m_muted = muted;
 
    setVolumeInternal(muted ? 0 : m_volume);
}
 
void MFPlayerSession::setVolumeInternal(float volume)
{
    if (m_volumeControl) {
        quint32 channelCount = 0;
        if (!SUCCEEDED(m_volumeControl->GetChannelCount(&channelCount))
                || channelCount == 0)
            return;
 
        for (quint32 i = 0; i < channelCount; ++i)
            m_volumeControl->SetChannelVolume(i, volume);
    }
}
 
float MFPlayerSession::bufferProgress()
{
    if (!m_netsourceStatistics)
        return 0;
    PROPVARIANT var;
    PropVariantInit(&var);
    PROPERTYKEY key;
    key.fmtid = MFNETSOURCE_STATISTICS;
    key.pid = MFNETSOURCE_BUFFERPROGRESS_ID;
    int progress = -1;
    // GetValue returns S_FALSE if the property is not available, which has
    // a value > 0. We therefore can't use the SUCCEEDED macro here.
    if (m_netsourceStatistics->GetValue(key, &var) == S_OK) {
        progress = var.lVal;
        PropVariantClear(&var);
    }
 
#ifdef DEBUG_MEDIAFOUNDATION
    qDebug() << "bufferProgress: progress = " << progress;
#endif
 
    return progress/100.;
}
 
QMediaTimeRange MFPlayerSession::availablePlaybackRanges()
{
    // defaults to the whole media
    qint64 start = 0;
    qint64 end = qint64(m_duration / 10000);
 
    if (m_netsourceStatistics) {
        PROPVARIANT var;
        PropVariantInit(&var);
        PROPERTYKEY key;
        key.fmtid = MFNETSOURCE_STATISTICS;
        key.pid = MFNETSOURCE_SEEKRANGESTART_ID;
        // GetValue returns S_FALSE if the property is not available, which has
        // a value > 0. We therefore can't use the SUCCEEDED macro here.
        if (m_netsourceStatistics->GetValue(key, &var) == S_OK) {
            start = qint64(var.uhVal.QuadPart / 10000);
            PropVariantClear(&var);
            PropVariantInit(&var);
            key.pid = MFNETSOURCE_SEEKRANGEEND_ID;
            if (m_netsourceStatistics->GetValue(key, &var) == S_OK) {
                end = qint64(var.uhVal.QuadPart / 10000);
                PropVariantClear(&var);
            }
        }
    }
 
    return QMediaTimeRange(start, end);
}
 
HRESULT MFPlayerSession::QueryInterface(REFIID riid, void** ppvObject)
{
    if (!ppvObject)
        return E_POINTER;
    if (riid == IID_IMFAsyncCallback) {
        *ppvObject = static_cast<IMFAsyncCallback*>(this);
    } else if (riid == IID_IUnknown) {
        *ppvObject = static_cast<IUnknown*>(this);
    } else {
        *ppvObject =  NULL;
        return E_NOINTERFACE;
    }
    return S_OK;
}
 
ULONG MFPlayerSession::AddRef(void)
{
    return InterlockedIncrement(&m_cRef);
}
 
ULONG MFPlayerSession::Release(void)
{
    LONG cRef = InterlockedDecrement(&m_cRef);
    if (cRef == 0) {
        deleteLater();
 
        // In rare cases the session has queued events to be run between deleteLater and deleting,
        // so we set the parent control to nullptr in order to prevent crashes in the cases.
        m_playerControl = nullptr;
    }
    return cRef;
}
 
HRESULT MFPlayerSession::Invoke(IMFAsyncResult *pResult)
{
    if (pResult->GetStateNoAddRef() != m_session.Get())
        return S_OK;
 
    ComPtr<IMFMediaEvent> pEvent;
    // Get the event from the event queue.
    HRESULT hr = m_session->EndGetEvent(pResult, &pEvent);
    if (FAILED(hr)) {
        return S_OK;
    }
 
    MediaEventType meType = MEUnknown;
    hr = pEvent->GetType(&meType);
    if (FAILED(hr)) {
        return S_OK;
    }
 
    if (meType == MESessionClosed) {
        SetEvent(m_hCloseEvent.get());
        return S_OK;
    } else {
        hr = m_session->BeginGetEvent(this, m_session.Get());
        if (FAILED(hr)) {
            return S_OK;
        }
    }
 
    if (!m_closing) {
        emit sessionEvent(pEvent);
    }
    return S_OK;
}
 
void MFPlayerSession::handleSessionEvent(const ComPtr<IMFMediaEvent> &sessionEvent)
{
    HRESULT hrStatus = S_OK;
    HRESULT hr = sessionEvent->GetStatus(&hrStatus);
    if (FAILED(hr) || !m_session) {
        return;
    }
 
    MediaEventType meType = MEUnknown;
    hr = sessionEvent->GetType(&meType);
#ifdef DEBUG_MEDIAFOUNDATION
    if (FAILED(hrStatus))
        qDebug() << "handleSessionEvent: MediaEventType = " << meType << "Failed";
    else
        qDebug() << "handleSessionEvent: MediaEventType = " << meType;
#endif
 
    switch (meType) {
    case MENonFatalError: {
            PROPVARIANT var;
            PropVariantInit(&var);
            sessionEvent->GetValue(&var);
            qWarning() << "handleSessionEvent: non fatal error = " << var.ulVal;
            PropVariantClear(&var);
            error(QMediaPlayer::ResourceError, tr("Media session non-fatal error."), false);
        }
        break;
    case MESourceUnknown:
        changeStatus(QMediaPlayer::InvalidMedia);
        break;
    case MEError:
        if (hrStatus == MF_E_ALREADY_INITIALIZED) {
            // Workaround for a possible WMF issue that causes an error
            // with some specific videos, which play fine otherwise.
#ifdef DEBUG_MEDIAFOUNDATION
            qDebug() << "handleSessionEvent: ignoring MF_E_ALREADY_INITIALIZED";
#endif
            break;
        }
        changeStatus(QMediaPlayer::InvalidMedia);
        qWarning() << "handleSessionEvent: serious error = "
                   << Qt::showbase << Qt::hex << Qt::uppercasedigits << static_cast<quint32>(hrStatus);
        switch (hrStatus) {
        case MF_E_NET_READ:
            error(QMediaPlayer::NetworkError, tr("Error reading from the network."), true);
            break;
        case MF_E_NET_WRITE:
            error(QMediaPlayer::NetworkError, tr("Error writing to the network."), true);
            break;
        case NS_E_FIREWALL:
            error(QMediaPlayer::NetworkError, tr("Network packets might be blocked by a firewall."), true);
            break;
        case MF_E_MEDIAPROC_WRONGSTATE:
            error(QMediaPlayer::ResourceError, tr("Media session state error."), true);
            break;
        case MF_E_INVALID_STREAM_DATA:
            error(QMediaPlayer::ResourceError, tr("Invalid stream data."), true);
            break;
        default:
            error(QMediaPlayer::ResourceError, tr("Media session serious error."), true);
            break;
        }
        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)) {
            PROPVARIANT var;
            PropVariantInit(&var);
            if (SUCCEEDED(sessionEvent->GetValue(&var)) && (var.vt == VT_R4))    {
                m_state.rate = var.fltVal;
            }
            playbackRateChanged(playbackRate());
        }
        break;
    case MESessionScrubSampleComplete :
        if (m_scrubbing)
            updatePendingCommands(CmdStart);
        break;
    case MESessionStarted:
        if (status() == QMediaPlayer::EndOfMedia
                || status() == QMediaPlayer::LoadedMedia) {
            // If the session started, then enough data is buffered to play
            changeStatus(QMediaPlayer::BufferedMedia);
        }
 
        updatePendingCommands(CmdStart);
        // playback started, we can now set again the procAmpValues if they have been
        // changed previously (these are lost when loading a new media)
//        if (m_playerService->videoWindowControl()) {
//            m_playerService->videoWindowControl()->applyImageControls();
//        }
        m_signalPositionChangeTimer.start();
        break;
    case MESessionStopped:
        if (status() != QMediaPlayer::EndOfMedia) {
            m_position = 0;
 
            // Reset to Loaded status unless we are loading a new media
            // or changing the playback rate to negative values (stop required)
            if (status() != QMediaPlayer::LoadingMedia && m_request.command != CmdSeekResume)
                changeStatus(QMediaPlayer::LoadedMedia);
        }
        updatePendingCommands(CmdStop);
        m_signalPositionChangeTimer.stop();
        break;
    case MESessionPaused:
        m_position = position() * 10000;
        updatePendingCommands(CmdPause);
        m_signalPositionChangeTimer.stop();
        if (status() == QMediaPlayer::LoadedMedia)
            setPosition(position());
        break;
    case MEReconnectStart:
#ifdef DEBUG_MEDIAFOUNDATION
            qDebug() << "MEReconnectStart" << ((hrStatus == S_OK) ? "OK" : "Failed");
#endif
        break;
    case MEReconnectEnd:
#ifdef DEBUG_MEDIAFOUNDATION
            qDebug() << "MEReconnectEnd" << ((hrStatus == S_OK) ? "OK" : "Failed");
#endif
        break;
    case MESessionTopologySet:
        if (FAILED(hrStatus)) {
            changeStatus(QMediaPlayer::InvalidMedia);
            error(QMediaPlayer::FormatError, tr("Unsupported media, a codec is missing."), true);
        } else {
            // Topology is resolved and successfuly set, this happens only after loading a new media.
            // Make sure we always start the media from the beginning
            m_lastPosition = -1;
            m_position = 0;
            positionChanged(0);
            changeStatus(QMediaPlayer::LoadedMedia);
        }
        break;
    }
 
    if (FAILED(hrStatus)) {
        return;
    }
 
    switch (meType) {
    case MEBufferingStarted:
        changeStatus(QMediaPlayer::StalledMedia);
        bufferProgressChanged(bufferProgress());
        break;
    case MEBufferingStopped:
        changeStatus(QMediaPlayer::BufferedMedia);
        bufferProgressChanged(bufferProgress());
        break;
    case MESessionEnded:
        m_pendingState = NoPending;
        m_state.command = CmdStop;
        m_state.prevCmd = CmdNone;
        m_request.command = CmdNone;
        m_request.prevCmd = CmdNone;
 
        //keep reporting the final position after end of media
        m_position = qint64(m_duration);
        positionChanged(position());
 
        changeStatus(QMediaPlayer::EndOfMedia);
        break;
    case MEEndOfPresentationSegment:
        break;
    case MESessionTopologyStatus: {
            UINT32 status;
            if (SUCCEEDED(sessionEvent->GetUINT32(MF_EVENT_TOPOLOGY_STATUS, &status))) {
                if (status == MF_TOPOSTATUS_READY) {
                    ComPtr<IMFClock> clock;
                    if (SUCCEEDED(m_session->GetClock(&clock))) {
                        clock->QueryInterface(IID_IMFPresentationClock, &m_presentationClock);
                    }
 
                    if (SUCCEEDED(MFGetService(m_session.Get(), MF_RATE_CONTROL_SERVICE,
                                               IID_PPV_ARGS(&m_rateControl)))) {
                        if (SUCCEEDED(MFGetService(m_session.Get(), MF_RATE_CONTROL_SERVICE,
                                                   IID_PPV_ARGS(&m_rateSupport)))) {
                            if (SUCCEEDED(m_rateSupport->IsRateSupported(TRUE, 0, NULL)))
                                m_canScrub = true;
                        }
                        BOOL isThin = FALSE;
                        float rate = 1;
                        if (SUCCEEDED(m_rateControl->GetRate(&isThin, &rate))) {
                            if (m_pendingRate != rate) {
                                m_state.rate = m_request.rate = rate;
                                setPlaybackRate(m_pendingRate);
                            }
                        }
                    }
                    MFGetService(m_session.Get(), MFNETSOURCE_STATISTICS_SERVICE,
                                 IID_PPV_ARGS(&m_netsourceStatistics));
 
                    if (SUCCEEDED(MFGetService(m_session.Get(), MR_STREAM_VOLUME_SERVICE,
                                               IID_PPV_ARGS(&m_volumeControl))))
                        setVolumeInternal(m_muted ? 0 : m_volume);
 
                    m_updatingTopology = false;
                    stop();
                }
            }
        }
        break;
    default:
        break;
    }
}
 
void MFPlayerSession::updatePendingCommands(Command command)
{
    positionChanged(position());
    if (m_state.command != command || m_pendingState == NoPending)
        return;
 
    // Seek while paused completed
    if (m_pendingState == SeekPending && m_state.prevCmd == CmdPause) {
        m_pendingState = NoPending;
        // A seek operation actually restarts playback. If scrubbing is possible, playback rate
        // is set to 0.0 at this point and we just need to reset the current state to Pause.
        // If scrubbing is not possible, the playback rate was not changed and we explicitly need
        // to re-pause playback.
        if (!canScrub())
            pause();
        else
            m_state.setCommand(CmdPause);
    }
 
    m_pendingState = NoPending;
 
    //First look for rate changes.
    if (m_request.rate != m_state.rate) {
        commitRateChange(m_request.rate, m_request.isThin);
    }
 
    // Now look for new requests.
    if (m_pendingState == NoPending) {
        switch (m_request.command) {
        case CmdStart:
            start();
            break;
        case CmdPause:
            pause();
            break;
        case CmdStop:
            stop();
            break;
        case CmdSeek:
        case CmdSeekResume:
            setPositionInternal(m_request.start, m_request.command);
            break;
        case CmdStartAndSeek:
            start();
            setPositionInternal(m_request.start, m_request.command);
            break;
        default:
            break;
        }
        m_request.setCommand(CmdNone);
    }
 
}
 
bool MFPlayerSession::canScrub() const
{
    return m_canScrub && m_rateSupport && m_rateControl;
}
 
void MFPlayerSession::clear()
{
#ifdef DEBUG_MEDIAFOUNDATION
    qDebug() << "MFPlayerSession::clear";
#endif
    m_mediaTypes = 0;
    m_canScrub = false;
 
    m_pendingState = NoPending;
    m_state.command = CmdStop;
    m_state.prevCmd = CmdNone;
    m_request.command = CmdNone;
    m_request.prevCmd = CmdNone;
 
    for (int i = 0; i < QPlatformMediaPlayer::NTrackTypes; ++i) {
        m_trackInfo[i].metaData.clear();
        m_trackInfo[i].nativeIndexes.clear();
        m_trackInfo[i].currentIndex = -1;
        m_trackInfo[i].sourceNodeId = TOPOID(-1);
        m_trackInfo[i].outputNodeId = TOPOID(-1);
        m_trackInfo[i].format = GUID_NULL;
    }
 
    if (!m_metaData.isEmpty()) {
        m_metaData.clear();
        metaDataChanged();
    }
 
    m_presentationClock.Reset();
    m_rateControl.Reset();
    m_rateSupport.Reset();
    m_volumeControl.Reset();
    m_netsourceStatistics.Reset();
}
 
void MFPlayerSession::setAudioOutput(QPlatformAudioOutput *device)
{
    if (m_audioOutput == device)
        return;
 
    if (m_audioOutput)
        m_audioOutput->q->disconnect(this);
 
    m_audioOutput = device;
    if (m_audioOutput) {
        setMuted(m_audioOutput->q->isMuted());
        setVolume(m_audioOutput->q->volume());
        updateOutputRouting();
        connect(m_audioOutput->q, &QAudioOutput::deviceChanged, this, &MFPlayerSession::updateOutputRouting);
        connect(m_audioOutput->q, &QAudioOutput::volumeChanged, this, &MFPlayerSession::setVolume);
        connect(m_audioOutput->q, &QAudioOutput::mutedChanged, this, &MFPlayerSession::setMuted);
    }
}
 
void MFPlayerSession::updateOutputRouting()
{
    int currentAudioTrack = m_trackInfo[QPlatformMediaPlayer::AudioStream].currentIndex;
    if (currentAudioTrack > -1)
        setActiveTrack(QPlatformMediaPlayer::AudioStream, currentAudioTrack);
}
 
void MFPlayerSession::setVideoSink(QVideoSink *sink)
{
    m_videoRendererControl->setSink(sink);
}
 
void MFPlayerSession::setActiveTrack(QPlatformMediaPlayer::TrackType type, int index)
{
    if (!m_session)
        return;
 
    // Only audio track selection is currently supported.
    if (type != QPlatformMediaPlayer::AudioStream)
        return;
 
    const auto &nativeIndexes = m_trackInfo[type].nativeIndexes;
 
    if (index < -1 || index >= nativeIndexes.count())
        return;
 
    // Updating the topology fails if there is a HEVC video stream,
    // which causes other issues. Ignoring the change, for now.
    if (m_trackInfo[QPlatformMediaPlayer::VideoStream].format == MFVideoFormat_HEVC)
        return;
 
    ComPtr<IMFTopology> topology;
 
    if (SUCCEEDED(m_session->GetFullTopology(MFSESSION_GETFULLTOPOLOGY_CURRENT, 0, &topology))) {
 
        m_restorePosition = position() * 10000;
 
        if (m_state.command == CmdStart)
            stop();
 
        if (m_trackInfo[type].outputNodeId != TOPOID(-1)) {
            ComPtr<IMFTopologyNode> node;
            if (SUCCEEDED(topology->GetNodeByID(m_trackInfo[type].outputNodeId, &node))) {
                topology->RemoveNode(node.Get());
                m_trackInfo[type].outputNodeId = TOPOID(-1);
            }
        }
        if (m_trackInfo[type].sourceNodeId != TOPOID(-1)) {
            ComPtr<IMFTopologyNode> node;
            if (SUCCEEDED(topology->GetNodeByID(m_trackInfo[type].sourceNodeId, &node))) {
                topology->RemoveNode(node.Get());
                m_trackInfo[type].sourceNodeId = TOPOID(-1);
            }
        }
 
        IMFMediaSource *mediaSource = m_sourceResolver->mediaSource();
 
        ComPtr<IMFPresentationDescriptor> sourcePD;
        if (SUCCEEDED(mediaSource->CreatePresentationDescriptor(&sourcePD))) {
 
            if (m_trackInfo[type].currentIndex >= 0 && m_trackInfo[type].currentIndex < nativeIndexes.count())
                sourcePD->DeselectStream(nativeIndexes.at(m_trackInfo[type].currentIndex));
 
            m_trackInfo[type].currentIndex = index;
 
            if (index == -1) {
                m_session->SetTopology(MFSESSION_SETTOPOLOGY_IMMEDIATE, topology.Get());
            } else {
                int nativeIndex = nativeIndexes.at(index);
                sourcePD->SelectStream(nativeIndex);
 
                ComPtr<IMFStreamDescriptor> streamDesc;
                BOOL selected = FALSE;
 
                if (SUCCEEDED(sourcePD->GetStreamDescriptorByIndex(nativeIndex, &selected, &streamDesc))) {
                    ComPtr<IMFTopologyNode> sourceNode = addSourceNode(
                            topology.Get(), mediaSource, sourcePD.Get(), streamDesc.Get());
                    if (sourceNode) {
                        ComPtr<IMFTopologyNode> outputNode =
                                addOutputNode(MFPlayerSession::Audio, topology.Get(), 0);
                        if (outputNode) {
                            if (SUCCEEDED(sourceNode->ConnectOutput(0, outputNode.Get(), 0))) {
                                sourceNode->GetTopoNodeID(&m_trackInfo[type].sourceNodeId);
                                outputNode->GetTopoNodeID(&m_trackInfo[type].outputNodeId);
                                m_session->SetTopology(MFSESSION_SETTOPOLOGY_IMMEDIATE,
                                                       topology.Get());
                            }
                        }
                    }
                }
            }
            m_updatingTopology = true;
        }
    }
}
 
int MFPlayerSession::activeTrack(QPlatformMediaPlayer::TrackType type)
{
    if (type >= QPlatformMediaPlayer::NTrackTypes)
        return -1;
    return m_trackInfo[type].currentIndex;
}
 
int MFPlayerSession::trackCount(QPlatformMediaPlayer::TrackType type)
{
    if (type >= QPlatformMediaPlayer::NTrackTypes)
        return -1;
    return m_trackInfo[type].metaData.count();
}
 
QMediaMetaData MFPlayerSession::trackMetaData(QPlatformMediaPlayer::TrackType type, int trackNumber)
{
    if (type >= QPlatformMediaPlayer::NTrackTypes)
        return {};
 
    if (trackNumber < 0 || trackNumber >= m_trackInfo[type].metaData.count())
        return {};
 
    return m_trackInfo[type].metaData.at(trackNumber);
}
 
QT_END_NAMESPACE
 
#include "moc_mfplayersession_p.cpp"