wine-wine/dlls/mf/session.c

/*
 * Copyright 2017 Nikolay Sivov
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include <stdarg.h>
#include <math.h>

#define COBJMACROS

#include "windef.h"
#include "winbase.h"
#include "mfidl.h"
#include "mfapi.h"
#include "mferror.h"

#include "wine/debug.h"
#include "wine/heap.h"
#include "wine/list.h"

WINE_DEFAULT_DEBUG_CHANNEL(mfplat);

enum session_command
{
    SESSION_CMD_CLEAR_TOPOLOGIES,
    SESSION_CMD_CLOSE,
    SESSION_CMD_SET_TOPOLOGY,
    SESSION_CMD_START,
    SESSION_CMD_PAUSE,
    SESSION_CMD_STOP,
};

struct session_op
{
    IUnknown IUnknown_iface;
    LONG refcount;
    enum session_command command;
    union
    {
        struct
        {
            DWORD flags;
            IMFTopology *topology;
        } set_topology;
        struct
        {
            GUID time_format;
            PROPVARIANT start_position;
        } start;
    } u;
};

struct queued_topology
{
    struct list entry;
    IMFTopology *topology;
    MF_TOPOSTATUS status;
};

enum session_state
{
    SESSION_STATE_STOPPED = 0,
    SESSION_STATE_STARTING_SOURCES,
    SESSION_STATE_STARTING_SINKS,
    SESSION_STATE_RUNNING,
    SESSION_STATE_PAUSING_SINKS,
    SESSION_STATE_PAUSING_SOURCES,
    SESSION_STATE_PAUSED,
    SESSION_STATE_STOPPING_SINKS,
    SESSION_STATE_STOPPING_SOURCES,
    SESSION_STATE_CLOSED,
    SESSION_STATE_SHUT_DOWN,
};

enum object_state
{
    OBJ_STATE_STOPPED = 0,
    OBJ_STATE_STARTED,
    OBJ_STATE_PAUSED,
    OBJ_STATE_INVALID,
};

struct media_source
{
    struct list entry;
    IMFMediaSource *source;
    IMFPresentationDescriptor *pd;
    enum object_state state;
};

struct source_node
{
    struct list entry;
    IMFMediaStream *stream;
    IMFMediaSource *source;
    DWORD stream_id;
    enum object_state state;
};

struct media_sink
{
    struct list entry;
    IMFMediaSink *sink;
    IMFMediaEventGenerator *event_generator;
};

struct output_node
{
    struct list entry;
    IMFStreamSink *stream;
    enum object_state state;
};

enum presentation_flags
{
    SESSION_FLAG_SOURCES_SUBSCRIBED = 0x1,
    SESSION_FLAG_SINKS_SUBSCRIBED = 0x2,
};

struct media_session
{
    IMFMediaSession IMFMediaSession_iface;
    IMFGetService IMFGetService_iface;
    IMFRateSupport IMFRateSupport_iface;
    IMFRateControl IMFRateControl_iface;
    IMFAsyncCallback commands_callback;
    IMFAsyncCallback events_callback;
    LONG refcount;
    IMFMediaEventQueue *event_queue;
    IMFPresentationClock *clock;
    IMFPresentationTimeSource *system_time_source;
    IMFRateControl *clock_rate_control;
    IMFTopoLoader *topo_loader;
    IMFQualityManager *quality_manager;
    struct
    {
        IMFTopology *current_topology;
        MF_TOPOSTATUS topo_status;
        struct list sources;
        struct list source_nodes;
        struct list sinks;
        struct list output_nodes;
        DWORD flags;

        /* Latest Start() arguments. */
        GUID time_format;
        PROPVARIANT start_position;
    } presentation;
    struct list topologies;
    enum session_state state;
    DWORD caps;
    CRITICAL_SECTION cs;
};

struct clock_sink
{
    struct list entry;
    IMFClockStateSink *state_sink;
};

enum clock_command
{
    CLOCK_CMD_START = 0,
    CLOCK_CMD_STOP,
    CLOCK_CMD_PAUSE,
    CLOCK_CMD_SET_RATE,
    CLOCK_CMD_MAX,
};

enum clock_notification
{
    CLOCK_NOTIFY_START,
    CLOCK_NOTIFY_STOP,
    CLOCK_NOTIFY_PAUSE,
    CLOCK_NOTIFY_RESTART,
    CLOCK_NOTIFY_SET_RATE,
};

struct clock_state_change_param
{
    union
    {
        LONGLONG offset;
        float rate;
    } u;
};

struct sink_notification
{
    IUnknown IUnknown_iface;
    LONG refcount;
    MFTIME system_time;
    struct clock_state_change_param param;
    enum clock_notification notification;
    IMFClockStateSink *sink;
};

struct clock_timer
{
    IUnknown IUnknown_iface;
    LONG refcount;
    IMFAsyncResult *result;
    IMFAsyncCallback *callback;
    MFWORKITEM_KEY key;
    struct list entry;
};

struct presentation_clock
{
    IMFPresentationClock IMFPresentationClock_iface;
    IMFRateControl IMFRateControl_iface;
    IMFTimer IMFTimer_iface;
    IMFShutdown IMFShutdown_iface;
    IMFAsyncCallback sink_callback;
    IMFAsyncCallback timer_callback;
    LONG refcount;
    IMFPresentationTimeSource *time_source;
    IMFClockStateSink *time_source_sink;
    MFCLOCK_STATE state;
    struct list sinks;
    struct list timers;
    float rate;
    LONGLONG frequency;
    CRITICAL_SECTION cs;
};

struct quality_manager
{
    IMFQualityManager IMFQualityManager_iface;
    LONG refcount;
};

static inline struct media_session *impl_from_IMFMediaSession(IMFMediaSession *iface)
{
    return CONTAINING_RECORD(iface, struct media_session, IMFMediaSession_iface);
}

static struct media_session *impl_from_commands_callback_IMFAsyncCallback(IMFAsyncCallback *iface)
{
    return CONTAINING_RECORD(iface, struct media_session, commands_callback);
}

static struct media_session *impl_from_events_callback_IMFAsyncCallback(IMFAsyncCallback *iface)
{
    return CONTAINING_RECORD(iface, struct media_session, events_callback);
}

static struct media_session *impl_from_IMFGetService(IMFGetService *iface)
{
    return CONTAINING_RECORD(iface, struct media_session, IMFGetService_iface);
}

static struct media_session *impl_session_from_IMFRateSupport(IMFRateSupport *iface)
{
    return CONTAINING_RECORD(iface, struct media_session, IMFRateSupport_iface);
}

static struct media_session *impl_session_from_IMFRateControl(IMFRateControl *iface)
{
    return CONTAINING_RECORD(iface, struct media_session, IMFRateControl_iface);
}

static struct session_op *impl_op_from_IUnknown(IUnknown *iface)
{
    return CONTAINING_RECORD(iface, struct session_op, IUnknown_iface);
}

static struct presentation_clock *impl_from_IMFPresentationClock(IMFPresentationClock *iface)
{
    return CONTAINING_RECORD(iface, struct presentation_clock, IMFPresentationClock_iface);
}

static struct presentation_clock *impl_from_IMFRateControl(IMFRateControl *iface)
{
    return CONTAINING_RECORD(iface, struct presentation_clock, IMFRateControl_iface);
}

static struct presentation_clock *impl_from_IMFTimer(IMFTimer *iface)
{
    return CONTAINING_RECORD(iface, struct presentation_clock, IMFTimer_iface);
}

static struct presentation_clock *impl_from_IMFShutdown(IMFShutdown *iface)
{
    return CONTAINING_RECORD(iface, struct presentation_clock, IMFShutdown_iface);
}

static struct presentation_clock *impl_from_sink_callback_IMFAsyncCallback(IMFAsyncCallback *iface)
{
    return CONTAINING_RECORD(iface, struct presentation_clock, sink_callback);
}

static struct presentation_clock *impl_from_timer_callback_IMFAsyncCallback(IMFAsyncCallback *iface)
{
    return CONTAINING_RECORD(iface, struct presentation_clock, timer_callback);
}

static struct clock_timer *impl_clock_timer_from_IUnknown(IUnknown *iface)
{
    return CONTAINING_RECORD(iface, struct clock_timer, IUnknown_iface);
}

static struct sink_notification *impl_sink_notification_from_IUnknown(IUnknown *iface)
{
    return CONTAINING_RECORD(iface, struct sink_notification, IUnknown_iface);
}

static struct quality_manager *impl_from_IMFQualityManager(IMFQualityManager *iface)
{
    return CONTAINING_RECORD(iface, struct quality_manager, IMFQualityManager_iface);
}

/* IMFLocalMFTRegistration */
static HRESULT WINAPI local_mft_registration_QueryInterface(IMFLocalMFTRegistration *iface, REFIID riid, void **obj)
{
    TRACE("%p, %s, %p.\n", iface, debugstr_guid(riid), obj);

    if (IsEqualIID(riid, &IID_IMFLocalMFTRegistration) ||
            IsEqualIID(riid, &IID_IUnknown))
    {
        *obj = iface;
        IMFLocalMFTRegistration_AddRef(iface);
        return S_OK;
    }

    WARN("Unexpected %s.\n", debugstr_guid(riid));
    *obj = NULL;
    return E_NOINTERFACE;
}

static ULONG WINAPI local_mft_registration_AddRef(IMFLocalMFTRegistration *iface)
{
    return 2;
}

static ULONG WINAPI local_mft_registration_Release(IMFLocalMFTRegistration *iface)
{
    return 1;
}

static HRESULT WINAPI local_mft_registration_RegisterMFTs(IMFLocalMFTRegistration *iface, MFT_REGISTRATION_INFO *info,
        DWORD count)
{
    HRESULT hr = S_OK;
    DWORD i;

    TRACE("%p, %p, %u.\n", iface, info, count);

    for (i = 0; i < count; ++i)
    {
        if (FAILED(hr = MFTRegisterLocalByCLSID(&info[i].clsid, &info[i].guidCategory, info[i].pszName,
                info[i].uiFlags, info[i].cInTypes, info[i].pInTypes, info[i].cOutTypes, info[i].pOutTypes)))
        {
            break;
        }
    }

    return hr;
}

static const IMFLocalMFTRegistrationVtbl local_mft_registration_vtbl =
{
    local_mft_registration_QueryInterface,
    local_mft_registration_AddRef,
    local_mft_registration_Release,
    local_mft_registration_RegisterMFTs,
};

static IMFLocalMFTRegistration local_mft_registration = { &local_mft_registration_vtbl };

static HRESULT WINAPI session_op_QueryInterface(IUnknown *iface, REFIID riid, void **obj)
{
    if (IsEqualIID(riid, &IID_IUnknown))
    {
        *obj = iface;
        IUnknown_AddRef(iface);
        return S_OK;
    }

    *obj = NULL;
    return E_NOINTERFACE;
}

static ULONG WINAPI session_op_AddRef(IUnknown *iface)
{
    struct session_op *op = impl_op_from_IUnknown(iface);
    ULONG refcount = InterlockedIncrement(&op->refcount);

    TRACE("%p, refcount %u.\n", iface, refcount);

    return refcount;
}

static ULONG WINAPI session_op_Release(IUnknown *iface)
{
    struct session_op *op = impl_op_from_IUnknown(iface);
    ULONG refcount = InterlockedDecrement(&op->refcount);

    TRACE("%p, refcount %u.\n", iface, refcount);

    if (!refcount)
    {
        switch (op->command)
        {
            case SESSION_CMD_SET_TOPOLOGY:
                if (op->u.set_topology.topology)
                    IMFTopology_Release(op->u.set_topology.topology);
                break;
            case SESSION_CMD_START:
                PropVariantClear(&op->u.start.start_position);
                break;
            default:
                ;
        }
        heap_free(op);
    }

    return refcount;
}

static IUnknownVtbl session_op_vtbl =
{
    session_op_QueryInterface,
    session_op_AddRef,
    session_op_Release,
};

static HRESULT create_session_op(enum session_command command, struct session_op **ret)
{
    struct session_op *op;

    if (!(op = heap_alloc_zero(sizeof(*op))))
        return E_OUTOFMEMORY;

    op->IUnknown_iface.lpVtbl = &session_op_vtbl;
    op->refcount = 1;
    op->command = command;

    *ret = op;

    return S_OK;
}

static HRESULT session_is_shut_down(struct media_session *session)
{
    return session->state == SESSION_STATE_SHUT_DOWN ? MF_E_SHUTDOWN : S_OK;
}

static HRESULT session_submit_command(struct media_session *session, struct session_op *op)
{
    HRESULT hr;

    EnterCriticalSection(&session->cs);
    if (SUCCEEDED(hr = session_is_shut_down(session)))
        hr = MFPutWorkItem(MFASYNC_CALLBACK_QUEUE_STANDARD, &session->commands_callback, &op->IUnknown_iface);
    LeaveCriticalSection(&session->cs);

    return hr;
}

static void session_clear_topologies(struct media_session *session)
{
    struct queued_topology *ptr, *next;

    LIST_FOR_EACH_ENTRY_SAFE(ptr, next, &session->topologies, struct queued_topology, entry)
    {
        list_remove(&ptr->entry);
        IMFTopology_Release(ptr->topology);
        heap_free(ptr);
    }
}

static void session_set_topo_status(struct media_session *session, HRESULT status,
        MF_TOPOSTATUS topo_status)
{
    IMFMediaEvent *event;
    PROPVARIANT param;

    if (topo_status == MF_TOPOSTATUS_INVALID)
        return;

    if (topo_status > session->presentation.topo_status)
    {
        param.vt = VT_UNKNOWN;
        param.punkVal = (IUnknown *)session->presentation.current_topology;

        if (FAILED(MFCreateMediaEvent(MESessionTopologyStatus, &GUID_NULL, status, &param, &event)))
            return;

        session->presentation.topo_status = topo_status;

        IMFMediaEvent_SetUINT32(event, &MF_EVENT_TOPOLOGY_STATUS, topo_status);
        IMFMediaEventQueue_QueueEvent(session->event_queue, event);
        IMFMediaEvent_Release(event);
    }
}

static HRESULT session_bind_output_nodes(IMFTopology *topology)
{
    MF_TOPOLOGY_TYPE node_type;
    IMFStreamSink *stream_sink;
    IMFMediaSink *media_sink;
    WORD node_count = 0, i;
    IMFTopologyNode *node;
    IMFActivate *activate;
    UINT32 stream_id;
    IUnknown *object;
    HRESULT hr;

    hr = IMFTopology_GetNodeCount(topology, &node_count);

    for (i = 0; i < node_count; ++i)
    {
        if (FAILED(hr = IMFTopology_GetNode(topology, i, &node)))
            break;

        if (FAILED(hr = IMFTopologyNode_GetNodeType(node, &node_type)) || node_type != MF_TOPOLOGY_OUTPUT_NODE)
        {
            IMFTopologyNode_Release(node);
            continue;
        }

        if (SUCCEEDED(hr = IMFTopologyNode_GetObject(node, &object)))
        {
            stream_sink = NULL;
            if (FAILED(IUnknown_QueryInterface(object, &IID_IMFStreamSink, (void **)&stream_sink)))
            {
                if (SUCCEEDED(hr = IUnknown_QueryInterface(object, &IID_IMFActivate, (void **)&activate)))
                {
                    if (SUCCEEDED(hr = IMFActivate_ActivateObject(activate, &IID_IMFMediaSink, (void **)&media_sink)))
                    {
                        if (FAILED(IMFTopologyNode_GetUINT32(node, &MF_TOPONODE_STREAMID, &stream_id)))
                            stream_id = 0;

                        stream_sink = NULL;
                        if (FAILED(IMFMediaSink_GetStreamSinkById(media_sink, stream_id, &stream_sink)))
                            hr = IMFMediaSink_AddStreamSink(media_sink, stream_id, NULL, &stream_sink);

                        if (stream_sink)
                            hr = IMFTopologyNode_SetObject(node, (IUnknown *)stream_sink);

                        IMFMediaSink_Release(media_sink);
                    }

                    IMFActivate_Release(activate);
                }
            }

            if (stream_sink)
                IMFStreamSink_Release(stream_sink);
            IUnknown_Release(object);
        }

        IMFTopologyNode_Release(node);
    }

    return hr;
}

static void session_clear_presentation(struct media_session *session)
{
    struct source_node *src_node, *src_node2;
    struct media_source *source, *source2;
    struct media_sink *sink, *sink2;

    IMFTopology_Clear(session->presentation.current_topology);
    session->presentation.topo_status = MF_TOPOSTATUS_INVALID;

    LIST_FOR_EACH_ENTRY_SAFE(source, source2, &session->presentation.sources, struct media_source, entry)
    {
        list_remove(&source->entry);
        if (source->source)
            IMFMediaSource_Release(source->source);
        if (source->pd)
            IMFPresentationDescriptor_Release(source->pd);
        heap_free(source);
    }

    LIST_FOR_EACH_ENTRY_SAFE(src_node, src_node2, &session->presentation.source_nodes, struct source_node, entry)
    {
        list_remove(&src_node->entry);
        if (src_node->stream)
            IMFMediaStream_Release(src_node->stream);
        heap_free(src_node);
    }

    LIST_FOR_EACH_ENTRY_SAFE(sink, sink2, &session->presentation.sinks, struct media_sink, entry)
    {
        list_remove(&sink->entry);

        if (sink->sink)
            IMFMediaSink_Release(sink->sink);
        if (sink->event_generator)
            IMFMediaEventGenerator_Release(sink->event_generator);
        heap_free(sink);
    }
}

static void session_start(struct media_session *session, const GUID *time_format, const PROPVARIANT *start_position)
{
    struct media_source *source;
    HRESULT hr;

    EnterCriticalSection(&session->cs);

    switch (session->state)
    {
        case SESSION_STATE_STOPPED:
        case SESSION_STATE_PAUSED:

            session->presentation.time_format = *time_format;
            session->presentation.start_position.vt = VT_EMPTY;
            PropVariantCopy(&session->presentation.start_position, start_position);

            LIST_FOR_EACH_ENTRY(source, &session->presentation.sources, struct media_source, entry)
            {
                if (!(session->presentation.flags & SESSION_FLAG_SOURCES_SUBSCRIBED))
                {
                    if (FAILED(hr = IMFMediaSource_BeginGetEvent(source->source, &session->events_callback,
                            (IUnknown *)source->source)))
                    {
                        WARN("Failed to subscribe to source events, hr %#x.\n", hr);
                    }
                }

                if (FAILED(hr = IMFMediaSource_Start(source->source, source->pd, &GUID_NULL, start_position)))
                    WARN("Failed to start media source %p, hr %#x.\n", source->source, hr);
            }

            session->presentation.flags |= SESSION_FLAG_SOURCES_SUBSCRIBED;
            session->state = SESSION_STATE_STARTING_SOURCES;
            break;
        case SESSION_STATE_RUNNING:
            FIXME("Seeking is not implemented.\n");
            break;
        case SESSION_STATE_CLOSED:
            IMFMediaEventQueue_QueueEventParamVar(session->event_queue, MESessionStarted, &GUID_NULL,
                    MF_E_INVALIDREQUEST, NULL);
            break;
        default:
            ;
    }

    LeaveCriticalSection(&session->cs);
}

static void session_pause(struct media_session *session)
{
    HRESULT hr;

    EnterCriticalSection(&session->cs);

    switch (session->state)
    {
        case SESSION_STATE_RUNNING:

            /* Transition in two steps - pause clock, wait for sinks and pause sources. */
            if (SUCCEEDED(hr = IMFPresentationClock_Pause(session->clock)))
                session->state = SESSION_STATE_PAUSING_SINKS;

            break;
        default:
            hr = MF_E_INVALIDREQUEST;
    }

    if (FAILED(hr))
    {
        session->state = SESSION_STATE_PAUSED;
        IMFMediaEventQueue_QueueEventParamVar(session->event_queue, MESessionPaused, &GUID_NULL, hr, NULL);
    }

    LeaveCriticalSection(&session->cs);
}

static void session_stop(struct media_session *session)
{
    HRESULT hr = S_OK;

    EnterCriticalSection(&session->cs);

    switch (session->state)
    {
        case SESSION_STATE_RUNNING:
        case SESSION_STATE_PAUSED:

            /* Transition in two steps - pause clock, wait for sinks and pause sources. */
            if (SUCCEEDED(hr = IMFPresentationClock_Stop(session->clock)))
                session->state = SESSION_STATE_STOPPING_SINKS;

            break;
        default:
            ;
    }

    if (FAILED(hr))
    {
        session->state = SESSION_STATE_STOPPED;
        IMFMediaEventQueue_QueueEventParamVar(session->event_queue, MESessionStopped, &GUID_NULL, hr, NULL);
    }

    LeaveCriticalSection(&session->cs);
}

static struct media_source *session_get_media_source(struct media_session *session, IMFMediaSource *source)
{
    struct media_source *cur;

    LIST_FOR_EACH_ENTRY(cur, &session->presentation.sources, struct media_source, entry)
    {
        if (source == cur->source)
            return cur;
    }

    return NULL;
}

static void session_release_media_source(struct media_source *source)
{
    IMFMediaSource_Release(source->source);
    if (source->pd)
        IMFPresentationDescriptor_Release(source->pd);
    heap_free(source);
}

static HRESULT session_add_media_source(struct media_session *session, IMFTopologyNode *node, IMFMediaSource *source)
{
    struct media_source *media_source;
    HRESULT hr;

    if (session_get_media_source(session, source))
        return S_FALSE;

    if (!(media_source = heap_alloc_zero(sizeof(*media_source))))
        return E_OUTOFMEMORY;

    media_source->source = source;
    IMFMediaSource_AddRef(media_source->source);

    hr = IMFTopologyNode_GetUnknown(node, &MF_TOPONODE_PRESENTATION_DESCRIPTOR, &IID_IMFPresentationDescriptor,
            (void **)&media_source->pd);

    if (SUCCEEDED(hr))
        list_add_tail(&session->presentation.sources, &media_source->entry);
    else
        session_release_media_source(media_source);

    return hr;
}

static HRESULT session_add_source_node(struct media_session *session, IMFTopologyNode *node, IMFMediaSource *source)
{
    struct source_node *source_node;
    IMFStreamDescriptor *sd;
    DWORD stream_id;
    HRESULT hr;

    if (FAILED(hr = IMFTopologyNode_GetUnknown(node, &MF_TOPONODE_STREAM_DESCRIPTOR, &IID_IMFStreamDescriptor,
            (void **)&sd)))
    {
        WARN("Missing MF_TOPONODE_STREAM_DESCRIPTOR, hr %#x.\n", hr);
        return hr;
    }

    hr = IMFStreamDescriptor_GetStreamIdentifier(sd, &stream_id);
    IMFStreamDescriptor_Release(sd);
    if (FAILED(hr))
        return hr;

    if (!(source_node = heap_alloc_zero(sizeof(*source_node))))
        return E_OUTOFMEMORY;

    source_node->source = source;
    IMFMediaSource_AddRef(source_node->source);

    list_add_tail(&session->presentation.source_nodes, &source_node->entry);

    return hr;
}

static void session_collect_source_nodes(struct media_session *session)
{
    IMFTopology *topology;
    IMFTopologyNode *node;
    IMFCollection *nodes;
    DWORD count, i;
    HRESULT hr;

    if (!list_empty(&session->presentation.source_nodes))
        return;

    topology = session->presentation.current_topology;

    if (!topology || FAILED(IMFTopology_GetSourceNodeCollection(topology, &nodes)))
        return;

    if (FAILED(IMFCollection_GetElementCount(nodes, &count)))
        return;

    /* Create list of distinct sources, and whole list of source nodes. */
    for (i = 0; i < count; ++i)
    {
        if (SUCCEEDED(hr = IMFCollection_GetElement(nodes, i, (IUnknown **)&node)))
        {
            IMFMediaSource *source;

            if (FAILED(IMFTopologyNode_GetUnknown(node, &MF_TOPONODE_SOURCE, &IID_IMFMediaSource, (void **)&source)))
            {
                WARN("Missing MF_TOPONODE_SOURCE, hr %#x.\n", hr);
                IMFTopologyNode_Release(node);
                continue;
            }

            hr = session_add_media_source(session, node, source);
            IMFMediaSource_Release(source);

            if (SUCCEEDED(hr))
            {
                if (FAILED(hr = session_add_source_node(session, node, source)))
                    WARN("Failed to add source node, hr %#x.\n", hr);
            }

            IMFMediaSource_Release(source);
            IMFTopologyNode_Release(node);
        }
    }
}

static void session_raise_topology_set(struct media_session *session, IMFTopology *topology, HRESULT status)
{
    PROPVARIANT param;

    param.vt = topology ? VT_UNKNOWN : VT_EMPTY;
    param.punkVal = (IUnknown *)topology;

    IMFMediaEventQueue_QueueEventParamVar(session->event_queue, MESessionTopologySet, &GUID_NULL, status, &param);
}

static DWORD session_get_object_rate_caps(IUnknown *object)
{
    IMFRateSupport *rate_support;
    DWORD caps = 0;
    float rate;

    if (SUCCEEDED(MFGetService(object, &MF_RATE_CONTROL_SERVICE, &IID_IMFRateSupport, (void **)&rate_support)))
    {
        rate = 0.0f;
        if (SUCCEEDED(IMFRateSupport_GetFastestRate(rate_support, MFRATE_FORWARD, TRUE, &rate)) && rate != 0.0f)
            caps |= MFSESSIONCAP_RATE_FORWARD;

        rate = 0.0f;
        if (SUCCEEDED(IMFRateSupport_GetFastestRate(rate_support, MFRATE_REVERSE, TRUE, &rate)) && rate != 0.0f)
            caps |= MFSESSIONCAP_RATE_REVERSE;

        IMFRateSupport_Release(rate_support);
    }

    return caps;
}

static void session_set_caps(struct media_session *session, DWORD caps)
{
    DWORD delta = session->caps ^ caps;
    IMFMediaEvent *event;

    /* Delta is documented to reflect rate value changes as well, but it's not clear what to compare
       them to, since session always queries for current object rates. */
    if (!delta)
        return;

    session->caps = caps;

    if (FAILED(MFCreateMediaEvent(MESessionCapabilitiesChanged, &GUID_NULL, S_OK, NULL, &event)))
        return;

    IMFMediaEvent_SetUINT32(event, &MF_EVENT_SESSIONCAPS, caps);
    IMFMediaEvent_SetUINT32(event, &MF_EVENT_SESSIONCAPS_DELTA, delta);

    IMFMediaEventQueue_QueueEvent(session->event_queue, event);
    IMFMediaEvent_Release(event);
}

static HRESULT session_add_media_sink(struct media_session *session, IMFTopologyNode *node, IMFMediaSink *sink)
{
    struct media_sink *media_sink;

    LIST_FOR_EACH_ENTRY(media_sink, &session->presentation.sinks, struct media_sink, entry)
    {
        if (sink == media_sink->sink)
            return S_FALSE;
    }

    if (!(media_sink = heap_alloc_zero(sizeof(*media_sink))))
        return E_OUTOFMEMORY;

    media_sink->sink = sink;
    IMFMediaSink_AddRef(media_sink->sink);

    IMFMediaSink_QueryInterface(media_sink->sink, &IID_IMFMediaEventGenerator, (void **)&media_sink->event_generator);

    list_add_tail(&session->presentation.sinks, &media_sink->entry);

    return S_OK;
}

static HRESULT session_collect_output_nodes(struct media_session *session)
{
    IMFTopology *topology = session->presentation.current_topology;
    IMFTopologyNode *topo_node;
    struct output_node *node;
    IMFCollection *nodes;
    DWORD count, i;
    HRESULT hr;

    if (!list_empty(&session->presentation.output_nodes))
        return S_OK;

    if (FAILED(hr = IMFTopology_GetOutputNodeCollection(topology, &nodes)))
        return hr;

    if (FAILED(hr = IMFCollection_GetElementCount(nodes, &count)))
    {
        IMFCollection_Release(nodes);
        return hr;
    }

    for (i = 0; i < count; ++i)
    {
        IMFMediaSink *media_sink = NULL;

        if (FAILED(hr = IMFCollection_GetElement(nodes, i, (IUnknown **)&topo_node)))
            break;

        if (!(node = heap_alloc_zero(sizeof(*node))))
            hr = E_OUTOFMEMORY;

        if (SUCCEEDED(hr))
            hr = IMFTopologyNode_GetObject(topo_node, (IUnknown **)&node->stream);

        if (SUCCEEDED(hr))
            hr = IMFStreamSink_GetMediaSink(node->stream, &media_sink);

        if (SUCCEEDED(hr))
            hr = session_add_media_sink(session, topo_node, media_sink);

        if (media_sink)
            IMFMediaSink_Release(media_sink);

        if (SUCCEEDED(hr))
        {
            list_add_tail(&session->presentation.output_nodes, &node->entry);
        }
        else if (node)
        {
            if (node->stream)
                IMFStreamSink_Release(node->stream);
            heap_free(node);
        }

        IMFTopologyNode_Release(topo_node);
    }

    IMFCollection_Release(nodes);

    return hr;
}

static void session_set_current_topology(struct media_session *session, IMFTopology *topology)
{
    struct media_source *source;
    DWORD caps, object_flags;
    struct media_sink *sink;
    IMFMediaEvent *event;
    HRESULT hr;

    if (FAILED(hr = IMFTopology_CloneFrom(session->presentation.current_topology, topology)))
    {
        WARN("Failed to clone topology, hr %#x.\n", hr);
        return;
    }

    session_collect_source_nodes(session);
    session_collect_output_nodes(session);

    /* FIXME: attributes are all zero for now */
    if (SUCCEEDED(MFCreateMediaEvent(MESessionNotifyPresentationTime, &GUID_NULL, S_OK, NULL, &event)))
    {
        IMFMediaEvent_SetUINT64(event, &MF_EVENT_START_PRESENTATION_TIME, 0);
        IMFMediaEvent_SetUINT64(event, &MF_EVENT_PRESENTATION_TIME_OFFSET, 0);
        IMFMediaEvent_GetUINT64(event, &MF_EVENT_START_PRESENTATION_TIME_AT_OUTPUT, 0);

        IMFMediaEventQueue_QueueEvent(session->event_queue, event);
        IMFMediaEvent_Release(event);
    }

    /* Update session caps. */
    caps = MFSESSIONCAP_START | MFSESSIONCAP_SEEK | MFSESSIONCAP_RATE_FORWARD | MFSESSIONCAP_RATE_REVERSE |
            MFSESSIONCAP_DOES_NOT_USE_NETWORK;

    LIST_FOR_EACH_ENTRY(source, &session->presentation.sources, struct media_source, entry)
    {
        if (!caps)
            break;

        object_flags = 0;
        if (SUCCEEDED(IMFMediaSource_GetCharacteristics(source->source, &object_flags)))
        {
            if (!(object_flags & MFMEDIASOURCE_DOES_NOT_USE_NETWORK))
                caps &= ~MFSESSIONCAP_DOES_NOT_USE_NETWORK;
            if (!(object_flags & MFMEDIASOURCE_CAN_SEEK))
                caps &= ~MFSESSIONCAP_SEEK;
        }

        /* Mask unsupported rate caps. */

        caps &= session_get_object_rate_caps((IUnknown *)source->source)
                | ~(MFSESSIONCAP_RATE_FORWARD | MFSESSIONCAP_RATE_REVERSE);
    }

    LIST_FOR_EACH_ENTRY(sink, &session->presentation.sinks, struct media_sink, entry)
    {
        if (!caps)
            break;

        object_flags = 0;
        if (SUCCEEDED(IMFMediaSink_GetCharacteristics(sink->sink, &object_flags)))
        {
            if (!(object_flags & MEDIASINK_RATELESS))
                caps &= session_get_object_rate_caps((IUnknown *)sink->sink)
                        | ~(MFSESSIONCAP_RATE_FORWARD | MFSESSIONCAP_RATE_REVERSE);
        }
    }

    session_set_caps(session, caps);
}

static void session_set_topology(struct media_session *session, DWORD flags, IMFTopology *topology)
{
    HRESULT status = S_OK;

    /* Resolve unless claimed to be full. */
    if (!(flags & MFSESSION_SETTOPOLOGY_CLEAR_CURRENT) && topology)
    {
        if (!(flags & MFSESSION_SETTOPOLOGY_NORESOLUTION))
        {
            IMFTopology *resolved_topology = NULL;

            status = session_bind_output_nodes(topology);

            if (SUCCEEDED(status))
                status = IMFTopoLoader_Load(session->topo_loader, topology, &resolved_topology, NULL /* FIXME? */);

            if (SUCCEEDED(status))
            {
                topology = resolved_topology;
            }
        }
    }

    EnterCriticalSection(&session->cs);

    if (flags & MFSESSION_SETTOPOLOGY_CLEAR_CURRENT)
    {
        if ((topology && topology == session->presentation.current_topology) || !topology)
        {
            /* FIXME: stop current topology, queue next one. */
            session_clear_presentation(session);
        }
        else
            status = S_FALSE;

        topology = NULL;
    }
    else if (topology && flags & MFSESSION_SETTOPOLOGY_IMMEDIATE)
    {
        session_clear_topologies(session);
        session_clear_presentation(session);
    }

    session_raise_topology_set(session, topology, status);

    /* With no current topology set it right away, otherwise queue. */
    if (topology)
    {
        if (session->presentation.topo_status == MF_TOPOSTATUS_INVALID)
        {
            session_set_current_topology(session, topology);
        }
        else
        {
            struct queued_topology *queued_topology;

            if ((queued_topology = heap_alloc_zero(sizeof(*queued_topology))))
            {
                queued_topology->topology = topology;
                IMFTopology_AddRef(queued_topology->topology);

                list_add_tail(&session->topologies, &queued_topology->entry);
            }
        }
    }

    if (status == S_OK)
        session_set_topo_status(session, S_OK, MF_TOPOSTATUS_READY);

    LeaveCriticalSection(&session->cs);
}

static HRESULT WINAPI mfsession_QueryInterface(IMFMediaSession *iface, REFIID riid, void **out)
{
    struct media_session *session = impl_from_IMFMediaSession(iface);

    TRACE("%p, %s, %p.\n", iface, debugstr_guid(riid), out);

    if (IsEqualIID(riid, &IID_IMFMediaSession) ||
            IsEqualIID(riid, &IID_IMFMediaEventGenerator) ||
            IsEqualIID(riid, &IID_IUnknown))
    {
        *out = &session->IMFMediaSession_iface;
        IMFMediaSession_AddRef(iface);
        return S_OK;
    }
    else if (IsEqualIID(riid, &IID_IMFGetService))
    {
        *out = &session->IMFGetService_iface;
        IMFMediaSession_AddRef(iface);
        return S_OK;
    }

    WARN("Unsupported %s.\n", debugstr_guid(riid));
    *out = NULL;
    return E_NOINTERFACE;
}

static ULONG WINAPI mfsession_AddRef(IMFMediaSession *iface)
{
    struct media_session *session = impl_from_IMFMediaSession(iface);
    ULONG refcount = InterlockedIncrement(&session->refcount);

    TRACE("%p, refcount %u.\n", iface, refcount);

    return refcount;
}

static ULONG WINAPI mfsession_Release(IMFMediaSession *iface)
{
    struct media_session *session = impl_from_IMFMediaSession(iface);
    ULONG refcount = InterlockedDecrement(&session->refcount);

    TRACE("%p, refcount %u.\n", iface, refcount);

    if (!refcount)
    {
        session_clear_topologies(session);
        session_clear_presentation(session);
        if (session->presentation.current_topology)
            IMFTopology_Release(session->presentation.current_topology);
        if (session->event_queue)
            IMFMediaEventQueue_Release(session->event_queue);
        if (session->clock)
            IMFPresentationClock_Release(session->clock);
        if (session->system_time_source)
            IMFPresentationTimeSource_Release(session->system_time_source);
        if (session->clock_rate_control)
            IMFRateControl_Release(session->clock_rate_control);
        if (session->topo_loader)
            IMFTopoLoader_Release(session->topo_loader);
        if (session->quality_manager)
            IMFQualityManager_Release(session->quality_manager);
        DeleteCriticalSection(&session->cs);
        heap_free(session);
    }

    return refcount;
}

static HRESULT WINAPI mfsession_GetEvent(IMFMediaSession *iface, DWORD flags, IMFMediaEvent **event)
{
    struct media_session *session = impl_from_IMFMediaSession(iface);

    TRACE("%p, %#x, %p.\n", iface, flags, event);

    return IMFMediaEventQueue_GetEvent(session->event_queue, flags, event);
}

static HRESULT WINAPI mfsession_BeginGetEvent(IMFMediaSession *iface, IMFAsyncCallback *callback, IUnknown *state)
{
    struct media_session *session = impl_from_IMFMediaSession(iface);

    TRACE("%p, %p, %p.\n", iface, callback, state);

    return IMFMediaEventQueue_BeginGetEvent(session->event_queue, callback, state);
}

static HRESULT WINAPI mfsession_EndGetEvent(IMFMediaSession *iface, IMFAsyncResult *result, IMFMediaEvent **event)
{
    struct media_session *session = impl_from_IMFMediaSession(iface);

    TRACE("%p, %p, %p.\n", iface, result, event);

    return IMFMediaEventQueue_EndGetEvent(session->event_queue, result, event);
}

static HRESULT WINAPI mfsession_QueueEvent(IMFMediaSession *iface, MediaEventType event_type, REFGUID ext_type,
        HRESULT hr, const PROPVARIANT *value)
{
    struct media_session *session = impl_from_IMFMediaSession(iface);

    TRACE("%p, %d, %s, %#x, %p.\n", iface, event_type, debugstr_guid(ext_type), hr, value);

    return IMFMediaEventQueue_QueueEventParamVar(session->event_queue, event_type, ext_type, hr, value);
}

static HRESULT WINAPI mfsession_SetTopology(IMFMediaSession *iface, DWORD flags, IMFTopology *topology)
{
    struct media_session *session = impl_from_IMFMediaSession(iface);
    struct session_op *op;
    WORD node_count = 0;
    HRESULT hr;

    TRACE("%p, %#x, %p.\n", iface, flags, topology);

    if (topology)
    {
        if (FAILED(IMFTopology_GetNodeCount(topology, &node_count)) || node_count == 0)
            return E_INVALIDARG;
    }

    if (FAILED(hr = create_session_op(SESSION_CMD_SET_TOPOLOGY, &op)))
        return hr;

    op->u.set_topology.flags = flags;
    op->u.set_topology.topology = topology;
    if (op->u.set_topology.topology)
        IMFTopology_AddRef(op->u.set_topology.topology);

    hr = session_submit_command(session, op);
    IUnknown_Release(&op->IUnknown_iface);

    return hr;
}

static HRESULT WINAPI mfsession_ClearTopologies(IMFMediaSession *iface)
{
    struct media_session *session = impl_from_IMFMediaSession(iface);
    struct session_op *op;
    HRESULT hr;

    TRACE("%p.\n", iface);

    if (FAILED(hr = create_session_op(SESSION_CMD_CLEAR_TOPOLOGIES, &op)))
        return hr;

    hr = session_submit_command(session, op);
    IUnknown_Release(&op->IUnknown_iface);

    return hr;
}

static HRESULT WINAPI mfsession_Start(IMFMediaSession *iface, const GUID *format, const PROPVARIANT *start_position)
{
    struct media_session *session = impl_from_IMFMediaSession(iface);
    struct session_op *op;
    HRESULT hr;

    TRACE("%p, %s, %p.\n", iface, debugstr_guid(format), start_position);

    if (!start_position)
        return E_POINTER;

    if (FAILED(hr = create_session_op(SESSION_CMD_START, &op)))
        return hr;

    op->u.start.time_format = format ? *format : GUID_NULL;
    hr = PropVariantCopy(&op->u.start.start_position, start_position);

    if (SUCCEEDED(hr))
        hr = session_submit_command(session, op);

    IUnknown_Release(&op->IUnknown_iface);

    return hr;
}

static HRESULT WINAPI mfsession_Pause(IMFMediaSession *iface)
{
    struct media_session *session = impl_from_IMFMediaSession(iface);
    struct session_op *op;
    HRESULT hr;

    TRACE("%p.\n", iface);

    if (FAILED(hr = create_session_op(SESSION_CMD_PAUSE, &op)))
        return hr;

    hr = session_submit_command(session, op);
    IUnknown_Release(&op->IUnknown_iface);

    return hr;
}

static HRESULT WINAPI mfsession_Stop(IMFMediaSession *iface)
{
    struct media_session *session = impl_from_IMFMediaSession(iface);
    struct session_op *op;
    HRESULT hr;

    TRACE("%p.\n", iface);

    if (FAILED(hr = create_session_op(SESSION_CMD_STOP, &op)))
        return hr;

    hr = session_submit_command(session, op);
    IUnknown_Release(&op->IUnknown_iface);

    return hr;
}

static HRESULT WINAPI mfsession_Close(IMFMediaSession *iface)
{
    struct media_session *session = impl_from_IMFMediaSession(iface);
    struct session_op *op;
    HRESULT hr;

    TRACE("%p.\n", iface);

    if (FAILED(hr = create_session_op(SESSION_CMD_CLOSE, &op)))
        return hr;

    hr = session_submit_command(session, op);
    IUnknown_Release(&op->IUnknown_iface);

    return hr;
}

static HRESULT WINAPI mfsession_Shutdown(IMFMediaSession *iface)
{
    struct media_session *session = impl_from_IMFMediaSession(iface);
    HRESULT hr = S_OK;

    FIXME("%p.\n", iface);

    EnterCriticalSection(&session->cs);
    if (SUCCEEDED(hr = session_is_shut_down(session)))
    {
        session->state = SESSION_STATE_SHUT_DOWN;
        IMFMediaEventQueue_Shutdown(session->event_queue);
        if (session->quality_manager)
            IMFQualityManager_Shutdown(session->quality_manager);
    }
    LeaveCriticalSection(&session->cs);

    return hr;
}

static HRESULT WINAPI mfsession_GetClock(IMFMediaSession *iface, IMFClock **clock)
{
    struct media_session *session = impl_from_IMFMediaSession(iface);
    HRESULT hr;

    TRACE("%p, %p.\n", iface, clock);

    EnterCriticalSection(&session->cs);
    if (SUCCEEDED(hr = session_is_shut_down(session)))
    {
        *clock = (IMFClock *)session->clock;
        IMFClock_AddRef(*clock);
    }
    LeaveCriticalSection(&session->cs);

    return hr;
}

static HRESULT WINAPI mfsession_GetSessionCapabilities(IMFMediaSession *iface, DWORD *caps)
{
    struct media_session *session = impl_from_IMFMediaSession(iface);
    HRESULT hr = S_OK;

    TRACE("%p, %p.\n", iface, caps);

    if (!caps)
        return E_POINTER;

    EnterCriticalSection(&session->cs);
    if (SUCCEEDED(hr = session_is_shut_down(session)))
        *caps = session->caps;
    LeaveCriticalSection(&session->cs);

    return hr;
}

static HRESULT WINAPI mfsession_GetFullTopology(IMFMediaSession *iface, DWORD flags, TOPOID id, IMFTopology **topology)
{
    struct media_session *session = impl_from_IMFMediaSession(iface);
    struct queued_topology *queued;
    TOPOID topo_id;
    HRESULT hr;

    TRACE("%p, %#x, %s, %p.\n", iface, flags, wine_dbgstr_longlong(id), topology);

    *topology = NULL;

    EnterCriticalSection(&session->cs);

    if (SUCCEEDED(hr = session_is_shut_down(session)))
    {
        if (flags & MFSESSION_GETFULLTOPOLOGY_CURRENT)
        {
            if (session->presentation.topo_status != MF_TOPOSTATUS_INVALID)
                *topology = session->presentation.current_topology;
            else
                hr = MF_E_INVALIDREQUEST;
        }
        else
        {
            LIST_FOR_EACH_ENTRY(queued, &session->topologies, struct queued_topology, entry)
            {
                if (SUCCEEDED(IMFTopology_GetTopologyID(queued->topology, &topo_id)) && topo_id == id)
                {
                    *topology = queued->topology;
                    break;
                }
            }
        }

        if (*topology)
            IMFTopology_AddRef(*topology);
    }

    LeaveCriticalSection(&session->cs);

    return hr;
}

static const IMFMediaSessionVtbl mfmediasessionvtbl =
{
    mfsession_QueryInterface,
    mfsession_AddRef,
    mfsession_Release,
    mfsession_GetEvent,
    mfsession_BeginGetEvent,
    mfsession_EndGetEvent,
    mfsession_QueueEvent,
    mfsession_SetTopology,
    mfsession_ClearTopologies,
    mfsession_Start,
    mfsession_Pause,
    mfsession_Stop,
    mfsession_Close,
    mfsession_Shutdown,
    mfsession_GetClock,
    mfsession_GetSessionCapabilities,
    mfsession_GetFullTopology,
};

static HRESULT WINAPI session_get_service_QueryInterface(IMFGetService *iface, REFIID riid, void **obj)
{
    struct media_session *session = impl_from_IMFGetService(iface);
    return IMFMediaSession_QueryInterface(&session->IMFMediaSession_iface, riid, obj);
}

static ULONG WINAPI session_get_service_AddRef(IMFGetService *iface)
{
    struct media_session *session = impl_from_IMFGetService(iface);
    return IMFMediaSession_AddRef(&session->IMFMediaSession_iface);
}

static ULONG WINAPI session_get_service_Release(IMFGetService *iface)
{
    struct media_session *session = impl_from_IMFGetService(iface);
    return IMFMediaSession_Release(&session->IMFMediaSession_iface);
}

static HRESULT WINAPI session_get_service_GetService(IMFGetService *iface, REFGUID service, REFIID riid, void **obj)
{
    struct media_session *session = impl_from_IMFGetService(iface);

    TRACE("%p, %s, %s, %p.\n", iface, debugstr_guid(service), debugstr_guid(riid), obj);

    *obj = NULL;

    if (IsEqualGUID(service, &MF_RATE_CONTROL_SERVICE))
    {
        if (IsEqualIID(riid, &IID_IMFRateSupport))
        {
            *obj = &session->IMFRateSupport_iface;
        }
        else if (IsEqualIID(riid, &IID_IMFRateControl))
        {
            *obj = &session->IMFRateControl_iface;
        }
    }
    else if (IsEqualGUID(service, &MF_LOCAL_MFT_REGISTRATION_SERVICE))
    {
        return IMFLocalMFTRegistration_QueryInterface(&local_mft_registration, riid, obj);
    }
    else
        FIXME("Unsupported service %s.\n", debugstr_guid(service));

    if (*obj)
        IUnknown_AddRef((IUnknown *)*obj);

    return *obj ? S_OK : E_NOINTERFACE;
}

static const IMFGetServiceVtbl session_get_service_vtbl =
{
    session_get_service_QueryInterface,
    session_get_service_AddRef,
    session_get_service_Release,
    session_get_service_GetService,
};

static HRESULT WINAPI session_commands_callback_QueryInterface(IMFAsyncCallback *iface, REFIID riid, void **obj)
{
    if (IsEqualIID(riid, &IID_IMFAsyncCallback) ||
            IsEqualIID(riid, &IID_IUnknown))
    {
        *obj = iface;
        IMFAsyncCallback_AddRef(iface);
        return S_OK;
    }

    WARN("Unsupported %s.\n", debugstr_guid(riid));
    *obj = NULL;
    return E_NOINTERFACE;
}

static ULONG WINAPI session_commands_callback_AddRef(IMFAsyncCallback *iface)
{
    struct media_session *session = impl_from_commands_callback_IMFAsyncCallback(iface);
    return IMFMediaSession_AddRef(&session->IMFMediaSession_iface);
}

static ULONG WINAPI session_commands_callback_Release(IMFAsyncCallback *iface)
{
    struct media_session *session = impl_from_commands_callback_IMFAsyncCallback(iface);
    return IMFMediaSession_Release(&session->IMFMediaSession_iface);
}

static HRESULT WINAPI session_commands_callback_GetParameters(IMFAsyncCallback *iface, DWORD *flags, DWORD *queue)
{
    return E_NOTIMPL;
}

static HRESULT WINAPI session_commands_callback_Invoke(IMFAsyncCallback *iface, IMFAsyncResult *result)
{
    struct session_op *op = impl_op_from_IUnknown(IMFAsyncResult_GetStateNoAddRef(result));
    struct media_session *session = impl_from_commands_callback_IMFAsyncCallback(iface);

    switch (op->command)
    {
        case SESSION_CMD_CLEAR_TOPOLOGIES:
            EnterCriticalSection(&session->cs);
            session_clear_topologies(session);
            LeaveCriticalSection(&session->cs);

            IMFMediaEventQueue_QueueEventParamVar(session->event_queue, MESessionTopologiesCleared, &GUID_NULL,
                    S_OK, NULL);
            break;
        case SESSION_CMD_SET_TOPOLOGY:
            session_set_topology(session, op->u.set_topology.flags, op->u.set_topology.topology);
            break;
        case SESSION_CMD_START:
            session_start(session, &op->u.start.time_format, &op->u.start.start_position);
            break;
        case SESSION_CMD_PAUSE:
            session_pause(session);
            break;
        case SESSION_CMD_STOP:
            session_stop(session);
            break;
        case SESSION_CMD_CLOSE:
            EnterCriticalSection(&session->cs);
            if (session->state != SESSION_STATE_CLOSED)
            {
                /* FIXME: actually do something to presentation objects */
                session->state = SESSION_STATE_CLOSED;
                IMFMediaEventQueue_QueueEventParamVar(session->event_queue, MESessionClosed, &GUID_NULL, S_OK, NULL);
            }
            LeaveCriticalSection(&session->cs);
            break;
        default:
            ;
    }

    return S_OK;
}

static const IMFAsyncCallbackVtbl session_commands_callback_vtbl =
{
    session_commands_callback_QueryInterface,
    session_commands_callback_AddRef,
    session_commands_callback_Release,
    session_commands_callback_GetParameters,
    session_commands_callback_Invoke,
};

static HRESULT WINAPI session_events_callback_QueryInterface(IMFAsyncCallback *iface, REFIID riid, void **obj)
{
    if (IsEqualIID(riid, &IID_IMFAsyncCallback) ||
            IsEqualIID(riid, &IID_IUnknown))
    {
        *obj = iface;
        IMFAsyncCallback_AddRef(iface);
        return S_OK;
    }

    WARN("Unsupported %s.\n", debugstr_guid(riid));
    *obj = NULL;
    return E_NOINTERFACE;
}

static ULONG WINAPI session_events_callback_AddRef(IMFAsyncCallback *iface)
{
    struct media_session *session = impl_from_events_callback_IMFAsyncCallback(iface);
    return IMFMediaSession_AddRef(&session->IMFMediaSession_iface);
}

static ULONG WINAPI session_events_callback_Release(IMFAsyncCallback *iface)
{
    struct media_session *session = impl_from_events_callback_IMFAsyncCallback(iface);
    return IMFMediaSession_Release(&session->IMFMediaSession_iface);
}

static HRESULT WINAPI session_events_callback_GetParameters(IMFAsyncCallback *iface, DWORD *flags, DWORD *queue)
{
    return E_NOTIMPL;
}

static HRESULT session_add_media_stream(struct media_session *session, IMFMediaSource *source, IMFMediaStream *stream)
{
    struct source_node *node;
    IMFStreamDescriptor *sd;
    DWORD stream_id = 0;
    HRESULT hr;

    if (FAILED(hr = IMFMediaStream_GetStreamDescriptor(stream, &sd)))
        return hr;

    hr = IMFStreamDescriptor_GetStreamIdentifier(sd, &stream_id);
    IMFStreamDescriptor_Release(sd);
    if (FAILED(hr))
        return hr;

    LIST_FOR_EACH_ENTRY(node, &session->presentation.source_nodes, struct source_node, entry)
    {
        if (node->source == source && node->stream_id == stream_id)
        {
            if (node->stream)
            {
                WARN("Source node already has stream set.\n");
                return S_FALSE;
            }

            node->stream = stream;
            IMFMediaStream_AddRef(node->stream);
            break;
        }
    }

    return S_OK;
}

static BOOL session_is_source_nodes_state(struct media_session *session, enum object_state state)
{
    struct media_source *source;
    struct source_node *node;

    LIST_FOR_EACH_ENTRY(source, &session->presentation.sources, struct media_source, entry)
    {
        if (source->state != state)
            return FALSE;
    }

    LIST_FOR_EACH_ENTRY(node, &session->presentation.source_nodes, struct source_node, entry)
    {
        if (node->state != state)
            return FALSE;
    }

    return TRUE;
}

static BOOL session_is_output_nodes_state(struct media_session *session, enum object_state state)
{
    struct output_node *node;

    LIST_FOR_EACH_ENTRY(node, &session->presentation.output_nodes, struct output_node, entry)
    {
        if (node->state != state)
            return FALSE;
    }

    return TRUE;
}

static enum object_state session_get_object_state_for_event(MediaEventType event)
{
    switch (event)
    {
        case MESourceStarted:
        case MEStreamStarted:
        case MEStreamSinkStarted:
            return OBJ_STATE_STARTED;
        case MESourcePaused:
        case MEStreamPaused:
        case MEStreamSinkPaused:
            return OBJ_STATE_PAUSED;
        case MESourceStopped:
        case MEStreamStopped:
        case MEStreamSinkStopped:
            return OBJ_STATE_STOPPED;
        default:
            return OBJ_STATE_INVALID;
    }
}

static HRESULT session_start_clock(struct media_session *session)
{
    IMFPresentationTimeSource *time_source = NULL;
    LONGLONG start_offset = 0;
    struct output_node *node;
    struct media_sink *sink;
    HRESULT hr;

    if (!(session->presentation.flags & SESSION_FLAG_SINKS_SUBSCRIBED))
    {
        LIST_FOR_EACH_ENTRY(sink, &session->presentation.sinks, struct media_sink, entry)
        {
            if (SUCCEEDED(IMFMediaSink_QueryInterface(sink->sink, &IID_IMFPresentationTimeSource,
                    (void **)&time_source)))
                 break;
        }

        if (time_source)
        {
            hr = IMFPresentationClock_SetTimeSource(session->clock, time_source);
            IMFPresentationTimeSource_Release(time_source);
        }
        else
            hr = IMFPresentationClock_SetTimeSource(session->clock, session->system_time_source);

        if (FAILED(hr))
            WARN("Failed to set time source, hr %#x.\n", hr);

        LIST_FOR_EACH_ENTRY(node, &session->presentation.output_nodes, struct output_node, entry)
        {
            if (FAILED(hr = IMFStreamSink_BeginGetEvent(node->stream, &session->events_callback,
                    (IUnknown *)node->stream)))
            {
                WARN("Failed to subscribe to stream sink events, hr %#x.\n", hr);
            }
        }

        LIST_FOR_EACH_ENTRY(sink, &session->presentation.sinks, struct media_sink, entry)
        {
            if (sink->event_generator && FAILED(hr = IMFMediaEventGenerator_BeginGetEvent(sink->event_generator,
                    &session->events_callback, (IUnknown *)sink->event_generator)))
            {
                WARN("Failed to subscribe to sink events, hr %#x.\n", hr);
            }

            if (FAILED(hr = IMFMediaSink_SetPresentationClock(sink->sink, session->clock)))
                WARN("Failed to set presentation clock for the sink, hr %#x.\n", hr);
        }

        session->presentation.flags |= SESSION_FLAG_SINKS_SUBSCRIBED;
    }

    if (IsEqualGUID(&session->presentation.time_format, &GUID_NULL))
    {
        if (session->presentation.start_position.vt == VT_EMPTY)
            start_offset = PRESENTATION_CURRENT_POSITION;
        else if (session->presentation.start_position.vt == VT_I8)
            start_offset = session->presentation.start_position.hVal.QuadPart;
        else
            FIXME("Unhandled position type %d.\n", session->presentation.start_position.vt);
    }
    else
        FIXME("Unhandled time format %s.\n", debugstr_guid(&session->presentation.time_format));

    if (FAILED(hr = IMFPresentationClock_Start(session->clock, start_offset)))
        WARN("Failed to start session clock, hr %#x.\n", hr);

    return hr;
}


static void session_set_source_object_state(struct media_session *session, IUnknown *object,
        MediaEventType event_type)
{
    struct source_node *src_node;
    struct output_node *out_node;
    struct media_source *src;
    enum object_state state;
    BOOL changed = FALSE;

    if ((state = session_get_object_state_for_event(event_type)) == OBJ_STATE_INVALID)
        return;

    switch (event_type)
    {
        case MESourceStarted:
        case MESourcePaused:
        case MESourceStopped:

            LIST_FOR_EACH_ENTRY(src, &session->presentation.sources, struct media_source, entry)
            {
                if (object == (IUnknown *)src->source)
                {
                    changed = src->state != state;
                    src->state = state;
                    break;
                }
            }
            break;
        case MEStreamStarted:
        case MEStreamPaused:
        case MEStreamStopped:

            LIST_FOR_EACH_ENTRY(src_node, &session->presentation.source_nodes, struct source_node, entry)
            {
                if (object == (IUnknown *)src_node->stream)
                {
                    changed = src_node->state != state;
                    src_node->state = state;
                    break;
                }
            }
        default:
            ;
    }

    if (!changed)
        return;

    switch (session->state)
    {
        case SESSION_STATE_STARTING_SOURCES:
            if (!session_is_source_nodes_state(session, OBJ_STATE_STARTED))
                break;

            session_set_topo_status(session, S_OK, MF_TOPOSTATUS_STARTED_SOURCE);
            if (SUCCEEDED(session_start_clock(session)))
                session->state = SESSION_STATE_STARTING_SINKS;

            break;
        case SESSION_STATE_PAUSING_SOURCES:
            if (!session_is_source_nodes_state(session, OBJ_STATE_PAUSED))
                break;

            session->state = SESSION_STATE_PAUSED;

            session_set_caps(session, session->caps & ~MFSESSIONCAP_PAUSE);

            IMFMediaEventQueue_QueueEventParamVar(session->event_queue, MESessionPaused, &GUID_NULL, S_OK, NULL);

            break;
        case SESSION_STATE_STOPPING_SOURCES:
            if (!session_is_source_nodes_state(session, OBJ_STATE_STOPPED))
                break;

            session->state = SESSION_STATE_STOPPED;

            LIST_FOR_EACH_ENTRY(out_node, &session->presentation.output_nodes, struct output_node, entry)
            {
                IMFStreamSink_Flush(out_node->stream);
            }

            session_set_caps(session, session->caps & ~MFSESSIONCAP_PAUSE);

            IMFMediaEventQueue_QueueEventParamVar(session->event_queue, MESessionStopped, &GUID_NULL, S_OK, NULL);

            break;
        default:
            ;
    }
}

static void session_set_sink_stream_state(struct media_session *session, IMFStreamSink *stream,
        MediaEventType event_type)
{
    struct media_source *source;
    struct output_node *node;
    enum object_state state;
    BOOL changed = FALSE;
    IMFMediaEvent *event;
    DWORD caps, flags;
    HRESULT hr;

    if ((state = session_get_object_state_for_event(event_type)) == OBJ_STATE_INVALID)
        return;

    LIST_FOR_EACH_ENTRY(node, &session->presentation.output_nodes, struct output_node, entry)
    {
        if (stream == node->stream)
        {
            changed = node->state != state;
            node->state = state;
            break;
        }
    }

    if (!changed)
        return;

    switch (session->state)
    {
        case SESSION_STATE_STARTING_SINKS:
            if (!session_is_output_nodes_state(session, OBJ_STATE_STARTED))
                break;

            session->state = SESSION_STATE_RUNNING;

            caps = session->caps | MFSESSIONCAP_PAUSE;

            LIST_FOR_EACH_ENTRY(source, &session->presentation.sources, struct media_source, entry)
            {
                if (SUCCEEDED(IMFMediaSource_GetCharacteristics(source->source, &flags)))
                {
                    if (!(flags & MFMEDIASOURCE_CAN_PAUSE))
                    {
                        caps &= ~MFSESSIONCAP_PAUSE;
                        break;
                    }
                }
            }

            session_set_caps(session, caps);

            if (SUCCEEDED(MFCreateMediaEvent(MESessionStarted, &GUID_NULL, S_OK, NULL, &event)))
            {
                IMFMediaEvent_SetUINT64(event, &MF_EVENT_PRESENTATION_TIME_OFFSET, 0);
                IMFMediaEventQueue_QueueEvent(session->event_queue, event);
                IMFMediaEvent_Release(event);
            }
            break;
        case SESSION_STATE_PAUSING_SINKS:
            if (!session_is_output_nodes_state(session, OBJ_STATE_PAUSED))
                break;

            session->state = SESSION_STATE_PAUSING_SOURCES;

            LIST_FOR_EACH_ENTRY(source, &session->presentation.sources, struct media_source, entry)
            {
                if (FAILED(hr = IMFMediaSource_Pause(source->source)))
                    break;
            }

            if (FAILED(hr))
            {
                session->state = SESSION_STATE_PAUSED;
                IMFMediaEventQueue_QueueEventParamVar(session->event_queue, MESessionPaused, &GUID_NULL, hr, NULL);
            }

            break;
        case SESSION_STATE_STOPPING_SINKS:
            if (!session_is_output_nodes_state(session, OBJ_STATE_STOPPED))
                break;

            session->state = SESSION_STATE_STOPPING_SOURCES;

            LIST_FOR_EACH_ENTRY(source, &session->presentation.sources, struct media_source, entry)
            {
                if (FAILED(hr = IMFMediaSource_Stop(source->source)))
                    break;
            }

            if (FAILED(hr))
            {
                session->state = SESSION_STATE_STOPPED;
                IMFMediaEventQueue_QueueEventParamVar(session->event_queue, MESessionStopped, &GUID_NULL, hr, NULL);
            }

            break;
        default:
            ;
    }
}

static HRESULT WINAPI session_events_callback_Invoke(IMFAsyncCallback *iface, IMFAsyncResult *result)
{
    struct media_session *session = impl_from_events_callback_IMFAsyncCallback(iface);
    IMFMediaEventGenerator *event_source;
    IMFMediaEvent *event = NULL;
    MediaEventType event_type;
    IMFMediaSource *source;
    IMFMediaStream *stream;
    PROPVARIANT value;
    HRESULT hr;

    if (FAILED(hr = IMFAsyncResult_GetState(result, (IUnknown **)&event_source)))
        return hr;

    if (FAILED(hr = IMFMediaEventGenerator_EndGetEvent(event_source, result, &event)))
    {
        WARN("Failed to get event from %p, hr %#x.\n", event_source, hr);
        goto failed;
    }

    if (FAILED(hr = IMFMediaEvent_GetType(event, &event_type)))
    {
        WARN("Failed to get event type, hr %#x.\n", hr);
        goto failed;
    }

    value.vt = VT_EMPTY;
    if (FAILED(hr = IMFMediaEvent_GetValue(event, &value)))
    {
        WARN("Failed to get event value, hr %#x.\n", hr);
        goto failed;
    }

    switch (event_type)
    {
        case MESourceStarted:
        case MESourcePaused:
        case MESourceStopped:
        case MEStreamStarted:
        case MEStreamPaused:
        case MEStreamStopped:

            EnterCriticalSection(&session->cs);
            session_set_source_object_state(session, (IUnknown *)event_source, event_type);
            LeaveCriticalSection(&session->cs);

            break;
        case MENewStream:
            stream = (IMFMediaStream *)value.punkVal;

            if (value.vt != VT_UNKNOWN || !stream)
            {
                WARN("Unexpected event value.\n");
                break;
            }

            if (FAILED(hr = IMFMediaStream_GetMediaSource(stream, &source)))
                break;

            EnterCriticalSection(&session->cs);
            if (SUCCEEDED(hr = session_add_media_stream(session, source, stream)))
                hr = IMFMediaStream_BeginGetEvent(stream, &session->events_callback, (IUnknown *)stream);
            LeaveCriticalSection(&session->cs);

            IMFMediaSource_Release(source);

            break;
        case MEStreamSinkStarted:
        case MEStreamSinkPaused:
        case MEStreamSinkStopped:

            EnterCriticalSection(&session->cs);
            session_set_sink_stream_state(session, (IMFStreamSink *)event_source, event_type);
            LeaveCriticalSection(&session->cs);

            break;
        default:
            ;
    }

    PropVariantClear(&value);

failed:
    if (event)
        IMFMediaEvent_Release(event);

    if (FAILED(hr = IMFMediaEventGenerator_BeginGetEvent(event_source, iface, (IUnknown *)event_source)))
        WARN("Failed to re-subscribe, hr %#x.\n", hr);

    IMFMediaEventGenerator_Release(event_source);

    return hr;
}

static const IMFAsyncCallbackVtbl session_events_callback_vtbl =
{
    session_events_callback_QueryInterface,
    session_events_callback_AddRef,
    session_events_callback_Release,
    session_events_callback_GetParameters,
    session_events_callback_Invoke,
};

static HRESULT WINAPI session_rate_support_QueryInterface(IMFRateSupport *iface, REFIID riid, void **obj)
{
    struct media_session *session = impl_session_from_IMFRateSupport(iface);
    return IMFMediaSession_QueryInterface(&session->IMFMediaSession_iface, riid, obj);
}

static ULONG WINAPI session_rate_support_AddRef(IMFRateSupport *iface)
{
    struct media_session *session = impl_session_from_IMFRateSupport(iface);
    return IMFMediaSession_AddRef(&session->IMFMediaSession_iface);
}

static ULONG WINAPI session_rate_support_Release(IMFRateSupport *iface)
{
    struct media_session *session = impl_session_from_IMFRateSupport(iface);
    return IMFMediaSession_Release(&session->IMFMediaSession_iface);
}

static void session_presentation_object_get_rate(IUnknown *object, MFRATE_DIRECTION direction,
        BOOL thin, BOOL fastest, float *result)
{
    IMFRateSupport *rate_support;
    float rate;

    if (SUCCEEDED(MFGetService(object, &MF_RATE_CONTROL_SERVICE, &IID_IMFRateSupport, (void **)&rate_support)))
    {
        rate = 0.0f;
        if (fastest)
        {
            if (SUCCEEDED(IMFRateSupport_GetFastestRate(rate_support, direction, thin, &rate)))
                *result = min(fabsf(rate), *result);
        }
        else
        {
            if (SUCCEEDED(IMFRateSupport_GetSlowestRate(rate_support, direction, thin, &rate)))
                *result = max(fabsf(rate), *result);
        }

        IMFRateSupport_Release(rate_support);
    }
}

static HRESULT session_get_presentation_rate(struct media_session *session, MFRATE_DIRECTION direction,
        BOOL thin, BOOL fastest, float *result)
{
    struct media_source *source;
    struct media_sink *sink;

    *result = 0.0f;

    EnterCriticalSection(&session->cs);

    LIST_FOR_EACH_ENTRY(source, &session->presentation.sources, struct media_source, entry)
    {
        session_presentation_object_get_rate((IUnknown *)source->source, direction, thin, fastest, result);
    }

    LIST_FOR_EACH_ENTRY(sink, &session->presentation.sinks, struct media_sink, entry)
    {
        session_presentation_object_get_rate((IUnknown *)sink->sink, direction, thin, fastest, result);
    }

    LeaveCriticalSection(&session->cs);

    return S_OK;
}

static HRESULT WINAPI session_rate_support_GetSlowestRate(IMFRateSupport *iface, MFRATE_DIRECTION direction,
        BOOL thin, float *rate)
{
    struct media_session *session = impl_session_from_IMFRateSupport(iface);

    TRACE("%p, %d, %d, %p.\n", iface, direction, thin, rate);

    return session_get_presentation_rate(session, direction, thin, FALSE, rate);
}

static HRESULT WINAPI session_rate_support_GetFastestRate(IMFRateSupport *iface, MFRATE_DIRECTION direction,
        BOOL thin, float *rate)
{
    struct media_session *session = impl_session_from_IMFRateSupport(iface);

    TRACE("%p, %d, %d, %p.\n", iface, direction, thin, rate);

    return session_get_presentation_rate(session, direction, thin, TRUE, rate);
}

static HRESULT WINAPI session_rate_support_IsRateSupported(IMFRateSupport *iface, BOOL thin, float rate,
        float *nearest_supported_rate)
{
    FIXME("%p, %d, %f, %p.\n", iface, thin, rate, nearest_supported_rate);

    return E_NOTIMPL;
}

static const IMFRateSupportVtbl session_rate_support_vtbl =
{
    session_rate_support_QueryInterface,
    session_rate_support_AddRef,
    session_rate_support_Release,
    session_rate_support_GetSlowestRate,
    session_rate_support_GetFastestRate,
    session_rate_support_IsRateSupported,
};

static HRESULT WINAPI session_rate_control_QueryInterface(IMFRateControl *iface, REFIID riid, void **obj)
{
    struct media_session *session = impl_session_from_IMFRateControl(iface);
    return IMFMediaSession_QueryInterface(&session->IMFMediaSession_iface, riid, obj);
}

static ULONG WINAPI session_rate_control_AddRef(IMFRateControl *iface)
{
    struct media_session *session = impl_session_from_IMFRateControl(iface);
    return IMFMediaSession_AddRef(&session->IMFMediaSession_iface);
}

static ULONG WINAPI session_rate_control_Release(IMFRateControl *iface)
{
    struct media_session *session = impl_session_from_IMFRateControl(iface);
    return IMFMediaSession_Release(&session->IMFMediaSession_iface);
}

static HRESULT WINAPI session_rate_control_SetRate(IMFRateControl *iface, BOOL thin, float rate)
{
    FIXME("%p, %d, %f.\n", iface, thin, rate);

    return E_NOTIMPL;
}

static HRESULT WINAPI session_rate_control_GetRate(IMFRateControl *iface, BOOL *thin, float *rate)
{
    struct media_session *session = impl_session_from_IMFRateControl(iface);

    TRACE("%p, %p, %p.\n", iface, thin, rate);

    return IMFRateControl_GetRate(session->clock_rate_control, thin, rate);
}

static const IMFRateControlVtbl session_rate_control_vtbl =
{
    session_rate_control_QueryInterface,
    session_rate_control_AddRef,
    session_rate_control_Release,
    session_rate_control_SetRate,
    session_rate_control_GetRate,
};

/***********************************************************************
 *      MFCreateMediaSession (mf.@)
 */
HRESULT WINAPI MFCreateMediaSession(IMFAttributes *config, IMFMediaSession **session)
{
    BOOL without_quality_manager = FALSE;
    struct media_session *object;
    HRESULT hr;

    TRACE("%p, %p.\n", config, session);

    object = heap_alloc_zero(sizeof(*object));
    if (!object)
        return E_OUTOFMEMORY;

    object->IMFMediaSession_iface.lpVtbl = &mfmediasessionvtbl;
    object->IMFGetService_iface.lpVtbl = &session_get_service_vtbl;
    object->IMFRateSupport_iface.lpVtbl = &session_rate_support_vtbl;
    object->IMFRateControl_iface.lpVtbl = &session_rate_control_vtbl;
    object->commands_callback.lpVtbl = &session_commands_callback_vtbl;
    object->events_callback.lpVtbl = &session_events_callback_vtbl;
    object->refcount = 1;
    list_init(&object->topologies);
    list_init(&object->presentation.sources);
    list_init(&object->presentation.source_nodes);
    list_init(&object->presentation.sinks);
    list_init(&object->presentation.output_nodes);
    InitializeCriticalSection(&object->cs);

    if (FAILED(hr = MFCreateTopology(&object->presentation.current_topology)))
        goto failed;

    if (FAILED(hr = MFCreateEventQueue(&object->event_queue)))
        goto failed;

    if (FAILED(hr = MFCreatePresentationClock(&object->clock)))
        goto failed;

    if (FAILED(hr = MFCreateSystemTimeSource(&object->system_time_source)))
        goto failed;

    if (FAILED(hr = IMFPresentationClock_QueryInterface(object->clock, &IID_IMFRateControl,
            (void **)&object->clock_rate_control)))
    {
        goto failed;
    }

    if (config)
    {
        GUID clsid;

        if (SUCCEEDED(IMFAttributes_GetGUID(config, &MF_SESSION_TOPOLOADER, &clsid)))
        {
            if (FAILED(hr = CoCreateInstance(&clsid, NULL, CLSCTX_INPROC_SERVER, &IID_IMFTopoLoader,
                    (void **)&object->topo_loader)))
            {
                WARN("Failed to create custom topology loader, hr %#x.\n", hr);
            }
        }

        if (SUCCEEDED(IMFAttributes_GetGUID(config, &MF_SESSION_QUALITY_MANAGER, &clsid)))
        {
            if (!(without_quality_manager = IsEqualGUID(&clsid, &GUID_NULL)))
            {
                if (FAILED(hr = CoCreateInstance(&clsid, NULL, CLSCTX_INPROC_SERVER, &IID_IMFQualityManager,
                        (void **)&object->quality_manager)))
                {
                    WARN("Failed to create custom quality manager, hr %#x.\n", hr);
                }
            }
        }
    }

    if (!object->topo_loader && FAILED(hr = MFCreateTopoLoader(&object->topo_loader)))
        goto failed;

    if (!object->quality_manager && !without_quality_manager &&
            FAILED(hr = MFCreateStandardQualityManager(&object->quality_manager)))
    {
        goto failed;
    }

    *session = &object->IMFMediaSession_iface;

    return S_OK;

failed:
    IMFMediaSession_Release(&object->IMFMediaSession_iface);
    return hr;
}

static HRESULT WINAPI present_clock_QueryInterface(IMFPresentationClock *iface, REFIID riid, void **out)
{
    struct presentation_clock *clock = impl_from_IMFPresentationClock(iface);

    TRACE("%p, %s, %p.\n", iface, debugstr_guid(riid), out);

    if (IsEqualIID(riid, &IID_IMFPresentationClock) ||
            IsEqualIID(riid, &IID_IMFClock) ||
            IsEqualIID(riid, &IID_IUnknown))
    {
        *out = &clock->IMFPresentationClock_iface;
    }
    else if (IsEqualIID(riid, &IID_IMFRateControl))
    {
        *out = &clock->IMFRateControl_iface;
    }
    else if (IsEqualIID(riid, &IID_IMFTimer))
    {
        *out = &clock->IMFTimer_iface;
    }
    else if (IsEqualIID(riid, &IID_IMFShutdown))
    {
        *out = &clock->IMFShutdown_iface;
    }
    else
    {
        WARN("Unsupported %s.\n", debugstr_guid(riid));
        *out = NULL;
        return E_NOINTERFACE;
    }

    IUnknown_AddRef((IUnknown *)*out);
    return S_OK;
}

static ULONG WINAPI present_clock_AddRef(IMFPresentationClock *iface)
{
    struct presentation_clock *clock = impl_from_IMFPresentationClock(iface);
    ULONG refcount = InterlockedIncrement(&clock->refcount);

    TRACE("%p, refcount %u.\n", iface, refcount);

    return refcount;
}

static ULONG WINAPI present_clock_Release(IMFPresentationClock *iface)
{
    struct presentation_clock *clock = impl_from_IMFPresentationClock(iface);
    ULONG refcount = InterlockedDecrement(&clock->refcount);
    struct clock_timer *timer, *timer2;
    struct clock_sink *sink, *sink2;

    TRACE("%p, refcount %u.\n", iface, refcount);

    if (!refcount)
    {
        if (clock->time_source)
            IMFPresentationTimeSource_Release(clock->time_source);
        if (clock->time_source_sink)
            IMFClockStateSink_Release(clock->time_source_sink);
        LIST_FOR_EACH_ENTRY_SAFE(sink, sink2, &clock->sinks, struct clock_sink, entry)
        {
            list_remove(&sink->entry);
            IMFClockStateSink_Release(sink->state_sink);
            heap_free(sink);
        }
        LIST_FOR_EACH_ENTRY_SAFE(timer, timer2, &clock->timers, struct clock_timer, entry)
        {
            list_remove(&timer->entry);
            IUnknown_Release(&timer->IUnknown_iface);
        }
        DeleteCriticalSection(&clock->cs);
        heap_free(clock);
    }

    return refcount;
}

static HRESULT WINAPI present_clock_GetClockCharacteristics(IMFPresentationClock *iface, DWORD *flags)
{
    struct presentation_clock *clock = impl_from_IMFPresentationClock(iface);
    HRESULT hr = MF_E_CLOCK_NO_TIME_SOURCE;

    TRACE("%p, %p.\n", iface, flags);

    EnterCriticalSection(&clock->cs);
    if (clock->time_source)
        hr = IMFPresentationTimeSource_GetClockCharacteristics(clock->time_source, flags);
    LeaveCriticalSection(&clock->cs);

    return hr;
}

static HRESULT WINAPI present_clock_GetCorrelatedTime(IMFPresentationClock *iface, DWORD reserved,
        LONGLONG *clock_time, MFTIME *system_time)
{
    struct presentation_clock *clock = impl_from_IMFPresentationClock(iface);
    HRESULT hr = MF_E_CLOCK_NO_TIME_SOURCE;

    TRACE("%p, %#x, %p, %p.\n", iface, reserved, clock_time, system_time);

    EnterCriticalSection(&clock->cs);
    if (clock->time_source)
        hr = IMFPresentationTimeSource_GetCorrelatedTime(clock->time_source, reserved, clock_time, system_time);
    LeaveCriticalSection(&clock->cs);

    return hr;
}

static HRESULT WINAPI present_clock_GetContinuityKey(IMFPresentationClock *iface, DWORD *key)
{
    TRACE("%p, %p.\n", iface, key);

    *key = 0;

    return S_OK;
}

static HRESULT WINAPI present_clock_GetState(IMFPresentationClock *iface, DWORD reserved, MFCLOCK_STATE *state)
{
    struct presentation_clock *clock = impl_from_IMFPresentationClock(iface);

    TRACE("%p, %#x, %p.\n", iface, reserved, state);

    EnterCriticalSection(&clock->cs);
    *state = clock->state;
    LeaveCriticalSection(&clock->cs);

    return S_OK;
}

static HRESULT WINAPI present_clock_GetProperties(IMFPresentationClock *iface, MFCLOCK_PROPERTIES *props)
{
    struct presentation_clock *clock = impl_from_IMFPresentationClock(iface);
    HRESULT hr = MF_E_CLOCK_NO_TIME_SOURCE;

    TRACE("%p, %p.\n", iface, props);

    EnterCriticalSection(&clock->cs);
    if (clock->time_source)
        hr = IMFPresentationTimeSource_GetProperties(clock->time_source, props);
    LeaveCriticalSection(&clock->cs);

    return hr;
}

static HRESULT WINAPI present_clock_SetTimeSource(IMFPresentationClock *iface,
        IMFPresentationTimeSource *time_source)
{
    struct presentation_clock *clock = impl_from_IMFPresentationClock(iface);
    MFCLOCK_PROPERTIES props;
    IMFClock *source_clock;
    HRESULT hr;

    TRACE("%p, %p.\n", iface, time_source);

    EnterCriticalSection(&clock->cs);

    if (clock->time_source)
        IMFPresentationTimeSource_Release(clock->time_source);
    if (clock->time_source_sink)
        IMFClockStateSink_Release(clock->time_source_sink);
    clock->time_source = NULL;
    clock->time_source_sink = NULL;

    hr = IMFPresentationTimeSource_QueryInterface(time_source, &IID_IMFClockStateSink, (void **)&clock->time_source_sink);
    if (SUCCEEDED(hr))
    {
        clock->time_source = time_source;
        IMFPresentationTimeSource_AddRef(clock->time_source);
    }

    if (SUCCEEDED(IMFPresentationTimeSource_GetUnderlyingClock(time_source, &source_clock)))
    {
        if (SUCCEEDED(IMFClock_GetProperties(source_clock, &props)))
            clock->frequency = props.qwClockFrequency;
        IMFClock_Release(source_clock);
    }

    if (!clock->frequency)
        clock->frequency = MFCLOCK_FREQUENCY_HNS;

    LeaveCriticalSection(&clock->cs);

    return hr;
}

static HRESULT WINAPI present_clock_GetTimeSource(IMFPresentationClock *iface,
        IMFPresentationTimeSource **time_source)
{
    struct presentation_clock *clock = impl_from_IMFPresentationClock(iface);
    HRESULT hr = S_OK;

    TRACE("%p, %p.\n", iface, time_source);

    if (!time_source)
        return E_INVALIDARG;

    EnterCriticalSection(&clock->cs);
    if (clock->time_source)
    {
        *time_source = clock->time_source;
        IMFPresentationTimeSource_AddRef(*time_source);
    }
    else
        hr = MF_E_CLOCK_NO_TIME_SOURCE;
    LeaveCriticalSection(&clock->cs);

    return hr;
}

static HRESULT WINAPI present_clock_GetTime(IMFPresentationClock *iface, MFTIME *time)
{
    struct presentation_clock *clock = impl_from_IMFPresentationClock(iface);
    HRESULT hr = MF_E_CLOCK_NO_TIME_SOURCE;
    MFTIME systime;

    TRACE("%p, %p.\n", iface, time);

    if (!time)
        return E_POINTER;

    EnterCriticalSection(&clock->cs);
    if (clock->time_source)
        hr = IMFPresentationTimeSource_GetCorrelatedTime(clock->time_source, 0, time, &systime);
    LeaveCriticalSection(&clock->cs);

    return hr;
}

static HRESULT WINAPI present_clock_AddClockStateSink(IMFPresentationClock *iface, IMFClockStateSink *state_sink)
{
    struct presentation_clock *clock = impl_from_IMFPresentationClock(iface);
    struct clock_sink *sink, *cur;
    HRESULT hr = S_OK;

    TRACE("%p, %p.\n", iface, state_sink);

    if (!state_sink)
        return E_INVALIDARG;

    sink = heap_alloc(sizeof(*sink));
    if (!sink)
        return E_OUTOFMEMORY;

    sink->state_sink = state_sink;
    IMFClockStateSink_AddRef(sink->state_sink);

    EnterCriticalSection(&clock->cs);
    LIST_FOR_EACH_ENTRY(cur, &clock->sinks, struct clock_sink, entry)
    {
        if (cur->state_sink == state_sink)
        {
            hr = E_INVALIDARG;
            break;
        }
    }
    if (SUCCEEDED(hr))
        list_add_tail(&clock->sinks, &sink->entry);
    LeaveCriticalSection(&clock->cs);

    if (FAILED(hr))
    {
        IMFClockStateSink_Release(sink->state_sink);
        heap_free(sink);
    }

    return hr;
}

static HRESULT WINAPI present_clock_RemoveClockStateSink(IMFPresentationClock *iface,
        IMFClockStateSink *state_sink)
{
    struct presentation_clock *clock = impl_from_IMFPresentationClock(iface);
    struct clock_sink *sink;

    TRACE("%p, %p.\n", iface, state_sink);

    if (!state_sink)
        return E_INVALIDARG;

    EnterCriticalSection(&clock->cs);
    LIST_FOR_EACH_ENTRY(sink, &clock->sinks, struct clock_sink, entry)
    {
        if (sink->state_sink == state_sink)
        {
            IMFClockStateSink_Release(sink->state_sink);
            list_remove(&sink->entry);
            heap_free(sink);
            break;
        }
    }
    LeaveCriticalSection(&clock->cs);

    return S_OK;
}

static HRESULT WINAPI sink_notification_QueryInterface(IUnknown *iface, REFIID riid, void **out)
{
    if (IsEqualIID(riid, &IID_IUnknown))
    {
        *out = iface;
        IUnknown_AddRef(iface);
        return S_OK;
    }

    WARN("Unsupported %s.\n", debugstr_guid(riid));
    *out = NULL;
    return E_NOINTERFACE;
}

static ULONG WINAPI sink_notification_AddRef(IUnknown *iface)
{
    struct sink_notification *notification = impl_sink_notification_from_IUnknown(iface);
    ULONG refcount = InterlockedIncrement(&notification->refcount);

    TRACE("%p, refcount %u.\n", iface, refcount);

    return refcount;
}

static ULONG WINAPI sink_notification_Release(IUnknown *iface)
{
    struct sink_notification *notification = impl_sink_notification_from_IUnknown(iface);
    ULONG refcount = InterlockedDecrement(&notification->refcount);

    TRACE("%p, refcount %u.\n", iface, refcount);

    if (!refcount)
    {
        IMFClockStateSink_Release(notification->sink);
        heap_free(notification);
    }

    return refcount;
}

static const IUnknownVtbl sinknotificationvtbl =
{
    sink_notification_QueryInterface,
    sink_notification_AddRef,
    sink_notification_Release,
};

static HRESULT create_sink_notification(MFTIME system_time, struct clock_state_change_param param,
        enum clock_notification notification, IMFClockStateSink *sink, IUnknown **out)
{
    struct sink_notification *object;

    object = heap_alloc(sizeof(*object));
    if (!object)
        return E_OUTOFMEMORY;

    object->IUnknown_iface.lpVtbl = &sinknotificationvtbl;
    object->refcount = 1;
    object->system_time = system_time;
    object->param = param;
    object->notification = notification;
    object->sink = sink;
    IMFClockStateSink_AddRef(object->sink);

    *out = &object->IUnknown_iface;

    return S_OK;
}

static HRESULT clock_call_state_change(MFTIME system_time, struct clock_state_change_param param,
        enum clock_notification notification, IMFClockStateSink *sink)
{
    HRESULT hr = S_OK;

    switch (notification)
    {
        case CLOCK_NOTIFY_START:
            hr = IMFClockStateSink_OnClockStart(sink, system_time, param.u.offset);
            break;
        case CLOCK_NOTIFY_STOP:
            hr = IMFClockStateSink_OnClockStop(sink, system_time);
            break;
        case CLOCK_NOTIFY_PAUSE:
            hr = IMFClockStateSink_OnClockPause(sink, system_time);
            break;
        case CLOCK_NOTIFY_RESTART:
            hr = IMFClockStateSink_OnClockRestart(sink, system_time);
            break;
        case CLOCK_NOTIFY_SET_RATE:
            /* System time source does not allow 0.0 rate, presentation clock allows it without raising errors. */
            IMFClockStateSink_OnClockSetRate(sink, system_time, param.u.rate);
            break;
        default:
            ;
    }

    return hr;
}

static HRESULT clock_change_state(struct presentation_clock *clock, enum clock_command command,
        struct clock_state_change_param param)
{
    static const BYTE state_change_is_allowed[MFCLOCK_STATE_PAUSED+1][CLOCK_CMD_MAX] =
    {   /*              S  S* P, R  */
        /* INVALID */ { 1, 1, 1, 1 },
        /* RUNNING */ { 1, 1, 1, 1 },
        /* STOPPED */ { 1, 1, 0, 1 },
        /* PAUSED  */ { 1, 1, 0, 1 },
    };
    static const MFCLOCK_STATE states[CLOCK_CMD_MAX] =
    {
        /* CLOCK_CMD_START    */ MFCLOCK_STATE_RUNNING,
        /* CLOCK_CMD_STOP     */ MFCLOCK_STATE_STOPPED,
        /* CLOCK_CMD_PAUSE    */ MFCLOCK_STATE_PAUSED,
        /* CLOCK_CMD_SET_RATE */ 0, /* Unused */
    };
    static const enum clock_notification notifications[CLOCK_CMD_MAX] =
    {
        /* CLOCK_CMD_START    */ CLOCK_NOTIFY_START,
        /* CLOCK_CMD_STOP     */ CLOCK_NOTIFY_STOP,
        /* CLOCK_CMD_PAUSE    */ CLOCK_NOTIFY_PAUSE,
        /* CLOCK_CMD_SET_RATE */ CLOCK_NOTIFY_SET_RATE,
    };
    enum clock_notification notification;
    struct clock_sink *sink;
    IUnknown *notify_object;
    MFCLOCK_STATE old_state;
    IMFAsyncResult *result;
    MFTIME system_time;
    HRESULT hr;

    if (!clock->time_source)
        return MF_E_CLOCK_NO_TIME_SOURCE;

    if (command != CLOCK_CMD_SET_RATE && clock->state == states[command] && clock->state != MFCLOCK_STATE_RUNNING)
        return MF_E_CLOCK_STATE_ALREADY_SET;

    if (!state_change_is_allowed[clock->state][command])
        return MF_E_INVALIDREQUEST;

    system_time = MFGetSystemTime();

    if (command == CLOCK_CMD_START && clock->state == MFCLOCK_STATE_PAUSED &&
            param.u.offset == PRESENTATION_CURRENT_POSITION)
    {
        notification = CLOCK_NOTIFY_RESTART;
    }
    else
        notification = notifications[command];

    if (FAILED(hr = clock_call_state_change(system_time, param, notification, clock->time_source_sink)))
        return hr;

    old_state = clock->state;
    clock->state = states[command];

    /* Dump all pending timer requests immediately on start; otherwise try to cancel scheduled items when
       transitioning from running state. */
    if ((clock->state == MFCLOCK_STATE_RUNNING) ^ (old_state == MFCLOCK_STATE_RUNNING))
    {
        struct clock_timer *timer, *timer2;

        if (clock->state == MFCLOCK_STATE_RUNNING)
        {
            LIST_FOR_EACH_ENTRY_SAFE(timer, timer2, &clock->timers, struct clock_timer, entry)
            {
                list_remove(&timer->entry);
                hr = MFCreateAsyncResult(&timer->IUnknown_iface, &clock->timer_callback, NULL, &result);
                IUnknown_Release(&timer->IUnknown_iface);
                if (SUCCEEDED(hr))
                {
                    MFPutWorkItemEx(MFASYNC_CALLBACK_QUEUE_TIMER, result);
                    IMFAsyncResult_Release(result);
                }
            }
        }
        else
        {
            LIST_FOR_EACH_ENTRY(timer, &clock->timers, struct clock_timer, entry)
            {
                if (timer->key)
                {
                    MFCancelWorkItem(timer->key);
                    timer->key = 0;
                }
            }
        }
    }

    LIST_FOR_EACH_ENTRY(sink, &clock->sinks, struct clock_sink, entry)
    {
        if (SUCCEEDED(create_sink_notification(system_time, param, notification, sink->state_sink, &notify_object)))
        {
            hr = MFCreateAsyncResult(notify_object, &clock->sink_callback, NULL, &result);
            IUnknown_Release(notify_object);
            if (SUCCEEDED(hr))
            {
                MFPutWorkItemEx(MFASYNC_CALLBACK_QUEUE_STANDARD, result);
                IMFAsyncResult_Release(result);
            }
        }
    }

    return S_OK;
}

static HRESULT WINAPI present_clock_Start(IMFPresentationClock *iface, LONGLONG start_offset)
{
    struct presentation_clock *clock = impl_from_IMFPresentationClock(iface);
    struct clock_state_change_param param = {{0}};
    HRESULT hr;

    TRACE("%p, %s.\n", iface, wine_dbgstr_longlong(start_offset));

    EnterCriticalSection(&clock->cs);
    param.u.offset = start_offset;
    hr = clock_change_state(clock, CLOCK_CMD_START, param);
    LeaveCriticalSection(&clock->cs);

    return hr;
}

static HRESULT WINAPI present_clock_Stop(IMFPresentationClock *iface)
{
    struct presentation_clock *clock = impl_from_IMFPresentationClock(iface);
    struct clock_state_change_param param = {{0}};
    HRESULT hr;

    TRACE("%p.\n", iface);

    EnterCriticalSection(&clock->cs);
    hr = clock_change_state(clock, CLOCK_CMD_STOP, param);
    LeaveCriticalSection(&clock->cs);

    return hr;
}

static HRESULT WINAPI present_clock_Pause(IMFPresentationClock *iface)
{
    struct presentation_clock *clock = impl_from_IMFPresentationClock(iface);
    struct clock_state_change_param param = {{0}};
    HRESULT hr;

    TRACE("%p.\n", iface);

    EnterCriticalSection(&clock->cs);
    hr = clock_change_state(clock, CLOCK_CMD_PAUSE, param);
    LeaveCriticalSection(&clock->cs);

    return hr;
}

static const IMFPresentationClockVtbl presentationclockvtbl =
{
    present_clock_QueryInterface,
    present_clock_AddRef,
    present_clock_Release,
    present_clock_GetClockCharacteristics,
    present_clock_GetCorrelatedTime,
    present_clock_GetContinuityKey,
    present_clock_GetState,
    present_clock_GetProperties,
    present_clock_SetTimeSource,
    present_clock_GetTimeSource,
    present_clock_GetTime,
    present_clock_AddClockStateSink,
    present_clock_RemoveClockStateSink,
    present_clock_Start,
    present_clock_Stop,
    present_clock_Pause,
};

static HRESULT WINAPI present_clock_rate_control_QueryInterface(IMFRateControl *iface, REFIID riid, void **out)
{
    struct presentation_clock *clock = impl_from_IMFRateControl(iface);
    return IMFPresentationClock_QueryInterface(&clock->IMFPresentationClock_iface, riid, out);
}

static ULONG WINAPI present_clock_rate_control_AddRef(IMFRateControl *iface)
{
    struct presentation_clock *clock = impl_from_IMFRateControl(iface);
    return IMFPresentationClock_AddRef(&clock->IMFPresentationClock_iface);
}

static ULONG WINAPI present_clock_rate_control_Release(IMFRateControl *iface)
{
    struct presentation_clock *clock = impl_from_IMFRateControl(iface);
    return IMFPresentationClock_Release(&clock->IMFPresentationClock_iface);
}

static HRESULT WINAPI present_clock_rate_SetRate(IMFRateControl *iface, BOOL thin, float rate)
{
    struct presentation_clock *clock = impl_from_IMFRateControl(iface);
    struct clock_state_change_param param;
    HRESULT hr;

    TRACE("%p, %d, %f.\n", iface, thin, rate);

    if (thin)
        return MF_E_THINNING_UNSUPPORTED;

    EnterCriticalSection(&clock->cs);
    param.u.rate = rate;
    if (SUCCEEDED(hr = clock_change_state(clock, CLOCK_CMD_SET_RATE, param)))
        clock->rate = rate;
    LeaveCriticalSection(&clock->cs);

    return hr;
}

static HRESULT WINAPI present_clock_rate_GetRate(IMFRateControl *iface, BOOL *thin, float *rate)
{
    struct presentation_clock *clock = impl_from_IMFRateControl(iface);

    TRACE("%p, %p, %p.\n", iface, thin, rate);

    if (!rate)
        return E_INVALIDARG;

    if (thin)
        *thin = FALSE;

    EnterCriticalSection(&clock->cs);
    *rate = clock->rate;
    LeaveCriticalSection(&clock->cs);

    return S_OK;
}

static const IMFRateControlVtbl presentclockratecontrolvtbl =
{
    present_clock_rate_control_QueryInterface,
    present_clock_rate_control_AddRef,
    present_clock_rate_control_Release,
    present_clock_rate_SetRate,
    present_clock_rate_GetRate,
};

static HRESULT WINAPI present_clock_timer_QueryInterface(IMFTimer *iface, REFIID riid, void **out)
{
    struct presentation_clock *clock = impl_from_IMFTimer(iface);
    return IMFPresentationClock_QueryInterface(&clock->IMFPresentationClock_iface, riid, out);
}

static ULONG WINAPI present_clock_timer_AddRef(IMFTimer *iface)
{
    struct presentation_clock *clock = impl_from_IMFTimer(iface);
    return IMFPresentationClock_AddRef(&clock->IMFPresentationClock_iface);
}

static ULONG WINAPI present_clock_timer_Release(IMFTimer *iface)
{
    struct presentation_clock *clock = impl_from_IMFTimer(iface);
    return IMFPresentationClock_Release(&clock->IMFPresentationClock_iface);
}

static HRESULT present_clock_schedule_timer(struct presentation_clock *clock, DWORD flags, LONGLONG time,
        struct clock_timer *timer)
{
    IMFAsyncResult *result;
    MFTIME systime, clocktime;
    LONGLONG frequency;
    HRESULT hr;

    if (!(flags & MFTIMER_RELATIVE))
    {
        if (FAILED(hr = IMFPresentationTimeSource_GetCorrelatedTime(clock->time_source, 0, &clocktime, &systime)))
        {
            WARN("Failed to get clock time, hr %#x.\n", hr);
            return hr;
        }
        time -= clocktime;
    }

    frequency = clock->frequency / 1000;
    time /= frequency;

    /* Scheduled item is using clock instance callback, with timer instance as an object. Clock callback will
       call user callback and cleanup timer list. */

    if (FAILED(hr = MFCreateAsyncResult(&timer->IUnknown_iface, &clock->timer_callback, NULL, &result)))
        return hr;

    hr = MFScheduleWorkItemEx(result, -time, &timer->key);
    IMFAsyncResult_Release(result);

    return hr;
}

static HRESULT WINAPI clock_timer_QueryInterface(IUnknown *iface, REFIID riid, void **obj)
{
    if (IsEqualIID(riid, &IID_IUnknown))
    {
        *obj = iface;
        IUnknown_AddRef(iface);
        return S_OK;
    }

    *obj = NULL;
    return E_NOINTERFACE;
}

static ULONG WINAPI clock_timer_AddRef(IUnknown *iface)
{
    struct clock_timer *timer = impl_clock_timer_from_IUnknown(iface);
    return InterlockedIncrement(&timer->refcount);
}

static ULONG WINAPI clock_timer_Release(IUnknown *iface)
{
    struct clock_timer *timer = impl_clock_timer_from_IUnknown(iface);
    ULONG refcount = InterlockedDecrement(&timer->refcount);

    if (!refcount)
    {
        IMFAsyncResult_Release(timer->result);
        IMFAsyncCallback_Release(timer->callback);
        heap_free(timer);
    }

    return refcount;
}

static const IUnknownVtbl clock_timer_vtbl =
{
    clock_timer_QueryInterface,
    clock_timer_AddRef,
    clock_timer_Release,
};

static HRESULT WINAPI present_clock_timer_SetTimer(IMFTimer *iface, DWORD flags, LONGLONG time,
        IMFAsyncCallback *callback, IUnknown *state, IUnknown **cancel_key)
{
    struct presentation_clock *clock = impl_from_IMFTimer(iface);
    struct clock_timer *clock_timer;
    HRESULT hr;

    TRACE("%p, %#x, %s, %p, %p, %p.\n", iface, flags, wine_dbgstr_longlong(time), callback, state, cancel_key);

    if (!(clock_timer = heap_alloc_zero(sizeof(*clock_timer))))
        return E_OUTOFMEMORY;

    if (FAILED(hr = MFCreateAsyncResult(NULL, NULL, state, &clock_timer->result)))
    {
        heap_free(clock_timer);
        return hr;
    }

    clock_timer->IUnknown_iface.lpVtbl = &clock_timer_vtbl;
    clock_timer->refcount = 1;
    clock_timer->callback = callback;
    IMFAsyncCallback_AddRef(clock_timer->callback);

    EnterCriticalSection(&clock->cs);

    if (clock->state == MFCLOCK_STATE_RUNNING)
        hr = present_clock_schedule_timer(clock, flags, time, clock_timer);
    else if (clock->state == MFCLOCK_STATE_STOPPED)
        hr = MF_S_CLOCK_STOPPED;

    if (SUCCEEDED(hr))
        list_add_tail(&clock->timers, &clock_timer->entry);

    LeaveCriticalSection(&clock->cs);

    if (SUCCEEDED(hr) && cancel_key)
    {
        *cancel_key = &clock_timer->IUnknown_iface;
        IUnknown_AddRef(*cancel_key);
    }

    return hr;
}

static HRESULT WINAPI present_clock_timer_CancelTimer(IMFTimer *iface, IUnknown *cancel_key)
{
    struct presentation_clock *clock = impl_from_IMFTimer(iface);
    struct clock_timer *timer;

    TRACE("%p, %p.\n", iface, cancel_key);

    EnterCriticalSection(&clock->cs);

    LIST_FOR_EACH_ENTRY(timer, &clock->timers, struct clock_timer, entry)
    {
        if (&timer->IUnknown_iface == cancel_key)
        {
            list_remove(&timer->entry);
            if (timer->key)
            {
                MFCancelWorkItem(timer->key);
                timer->key = 0;
            }
            IUnknown_Release(&timer->IUnknown_iface);
            break;
        }
    }

    LeaveCriticalSection(&clock->cs);

    return S_OK;
}

static const IMFTimerVtbl presentclocktimervtbl =
{
    present_clock_timer_QueryInterface,
    present_clock_timer_AddRef,
    present_clock_timer_Release,
    present_clock_timer_SetTimer,
    present_clock_timer_CancelTimer,
};

static HRESULT WINAPI present_clock_shutdown_QueryInterface(IMFShutdown *iface, REFIID riid, void **out)
{
    struct presentation_clock *clock = impl_from_IMFShutdown(iface);
    return IMFPresentationClock_QueryInterface(&clock->IMFPresentationClock_iface, riid, out);
}

static ULONG WINAPI present_clock_shutdown_AddRef(IMFShutdown *iface)
{
    struct presentation_clock *clock = impl_from_IMFShutdown(iface);
    return IMFPresentationClock_AddRef(&clock->IMFPresentationClock_iface);
}

static ULONG WINAPI present_clock_shutdown_Release(IMFShutdown *iface)
{
    struct presentation_clock *clock = impl_from_IMFShutdown(iface);
    return IMFPresentationClock_Release(&clock->IMFPresentationClock_iface);
}

static HRESULT WINAPI present_clock_shutdown_Shutdown(IMFShutdown *iface)
{
    FIXME("%p.\n", iface);

    return E_NOTIMPL;
}

static HRESULT WINAPI present_clock_shutdown_GetShutdownStatus(IMFShutdown *iface, MFSHUTDOWN_STATUS *status)
{
    FIXME("%p, %p.\n", iface, status);

    return E_NOTIMPL;
}

static const IMFShutdownVtbl presentclockshutdownvtbl =
{
    present_clock_shutdown_QueryInterface,
    present_clock_shutdown_AddRef,
    present_clock_shutdown_Release,
    present_clock_shutdown_Shutdown,
    present_clock_shutdown_GetShutdownStatus,
};

static HRESULT WINAPI present_clock_callback_QueryInterface(IMFAsyncCallback *iface, REFIID riid, void **out)
{
    if (IsEqualIID(riid, &IID_IMFAsyncCallback) ||
            IsEqualIID(riid, &IID_IUnknown))
    {
        *out = iface;
        IMFAsyncCallback_AddRef(iface);
        return S_OK;
    }

    WARN("Unsupported %s.\n", wine_dbgstr_guid(riid));
    *out = NULL;
    return E_NOINTERFACE;
}

static ULONG WINAPI present_clock_sink_callback_AddRef(IMFAsyncCallback *iface)
{
    struct presentation_clock *clock = impl_from_sink_callback_IMFAsyncCallback(iface);
    return IMFPresentationClock_AddRef(&clock->IMFPresentationClock_iface);
}

static ULONG WINAPI present_clock_sink_callback_Release(IMFAsyncCallback *iface)
{
    struct presentation_clock *clock = impl_from_sink_callback_IMFAsyncCallback(iface);
    return IMFPresentationClock_Release(&clock->IMFPresentationClock_iface);
}

static HRESULT WINAPI present_clock_callback_GetParameters(IMFAsyncCallback *iface, DWORD *flags, DWORD *queue)
{
    return E_NOTIMPL;
}

static HRESULT WINAPI present_clock_sink_callback_Invoke(IMFAsyncCallback *iface, IMFAsyncResult *result)
{
    struct sink_notification *data;
    IUnknown *object;
    HRESULT hr;

    if (FAILED(hr = IMFAsyncResult_GetObject(result, &object)))
        return hr;

    data = impl_sink_notification_from_IUnknown(object);

    clock_call_state_change(data->system_time, data->param, data->notification, data->sink);

    IUnknown_Release(object);

    return S_OK;
}

static const IMFAsyncCallbackVtbl presentclocksinkcallbackvtbl =
{
    present_clock_callback_QueryInterface,
    present_clock_sink_callback_AddRef,
    present_clock_sink_callback_Release,
    present_clock_callback_GetParameters,
    present_clock_sink_callback_Invoke,
};

static ULONG WINAPI present_clock_timer_callback_AddRef(IMFAsyncCallback *iface)
{
    struct presentation_clock *clock = impl_from_timer_callback_IMFAsyncCallback(iface);
    return IMFPresentationClock_AddRef(&clock->IMFPresentationClock_iface);
}

static ULONG WINAPI present_clock_timer_callback_Release(IMFAsyncCallback *iface)
{
    struct presentation_clock *clock = impl_from_timer_callback_IMFAsyncCallback(iface);
    return IMFPresentationClock_Release(&clock->IMFPresentationClock_iface);
}

static HRESULT WINAPI present_clock_timer_callback_Invoke(IMFAsyncCallback *iface, IMFAsyncResult *result)
{
    struct presentation_clock *clock = impl_from_timer_callback_IMFAsyncCallback(iface);
    struct clock_timer *timer;
    IUnknown *object;
    HRESULT hr;

    if (FAILED(hr = IMFAsyncResult_GetObject(result, &object)))
        return hr;

    timer = impl_clock_timer_from_IUnknown(object);

    EnterCriticalSection(&clock->cs);
    list_remove(&timer->entry);
    LeaveCriticalSection(&clock->cs);

    IMFAsyncCallback_Invoke(timer->callback, timer->result);

    IUnknown_Release(object);

    return S_OK;
}

static const IMFAsyncCallbackVtbl presentclocktimercallbackvtbl =
{
    present_clock_callback_QueryInterface,
    present_clock_timer_callback_AddRef,
    present_clock_timer_callback_Release,
    present_clock_callback_GetParameters,
    present_clock_timer_callback_Invoke,
};

/***********************************************************************
 *      MFCreatePresentationClock (mf.@)
 */
HRESULT WINAPI MFCreatePresentationClock(IMFPresentationClock **clock)
{
    struct presentation_clock *object;

    TRACE("%p.\n", clock);

    object = heap_alloc_zero(sizeof(*object));
    if (!object)
        return E_OUTOFMEMORY;

    object->IMFPresentationClock_iface.lpVtbl = &presentationclockvtbl;
    object->IMFRateControl_iface.lpVtbl = &presentclockratecontrolvtbl;
    object->IMFTimer_iface.lpVtbl = &presentclocktimervtbl;
    object->IMFShutdown_iface.lpVtbl = &presentclockshutdownvtbl;
    object->sink_callback.lpVtbl = &presentclocksinkcallbackvtbl;
    object->timer_callback.lpVtbl = &presentclocktimercallbackvtbl;
    object->refcount = 1;
    list_init(&object->sinks);
    list_init(&object->timers);
    object->rate = 1.0f;
    InitializeCriticalSection(&object->cs);

    *clock = &object->IMFPresentationClock_iface;

    return S_OK;
}

static HRESULT WINAPI standard_quality_manager_QueryInterface(IMFQualityManager *iface, REFIID riid, void **out)
{
    TRACE("%p, %s, %p.\n", iface, debugstr_guid(riid), out);

    if (IsEqualIID(riid, &IID_IMFQualityManager) ||
            IsEqualIID(riid, &IID_IUnknown))
    {
        *out = iface;
        IMFQualityManager_AddRef(iface);
        return S_OK;
    }

    WARN("Unsupported %s.\n", debugstr_guid(riid));
    *out = NULL;
    return E_NOINTERFACE;
}

static ULONG WINAPI standard_quality_manager_AddRef(IMFQualityManager *iface)
{
    struct quality_manager *manager = impl_from_IMFQualityManager(iface);
    ULONG refcount = InterlockedIncrement(&manager->refcount);

    TRACE("%p, refcount %u.\n", iface, refcount);

    return refcount;
}

static ULONG WINAPI standard_quality_manager_Release(IMFQualityManager *iface)
{
    struct quality_manager *manager = impl_from_IMFQualityManager(iface);
    ULONG refcount = InterlockedDecrement(&manager->refcount);

    TRACE("%p, refcount %u.\n", iface, refcount);

    if (!refcount)
    {
        heap_free(manager);
    }

    return refcount;
}

static HRESULT WINAPI standard_quality_manager_NotifyTopology(IMFQualityManager *iface, IMFTopology *topology)
{
    FIXME("%p, %p stub.\n", iface, topology);

    return E_NOTIMPL;
}

static HRESULT WINAPI standard_quality_manager_NotifyPresentationClock(IMFQualityManager *iface,
        IMFPresentationClock *clock)
{
    FIXME("%p, %p stub.\n", iface, clock);

    return E_NOTIMPL;
}

static HRESULT WINAPI standard_quality_manager_NotifyProcessInput(IMFQualityManager *iface, IMFTopologyNode *node,
        LONG input_index, IMFSample *sample)
{
    FIXME("%p, %p, %d, %p stub.\n", iface, node, input_index, sample);

    return E_NOTIMPL;
}

static HRESULT WINAPI standard_quality_manager_NotifyProcessOutput(IMFQualityManager *iface, IMFTopologyNode *node,
        LONG output_index, IMFSample *sample)
{
    FIXME("%p, %p, %d, %p stub.\n", iface, node, output_index, sample);

    return E_NOTIMPL;
}

static HRESULT WINAPI standard_quality_manager_NotifyQualityEvent(IMFQualityManager *iface, IUnknown *object,
        IMFMediaEvent *event)
{
    FIXME("%p, %p, %p stub.\n", iface, object, event);

    return E_NOTIMPL;
}

static HRESULT WINAPI standard_quality_manager_Shutdown(IMFQualityManager *iface)
{
    FIXME("%p stub.\n", iface);

    return E_NOTIMPL;
}

static IMFQualityManagerVtbl standard_quality_manager_vtbl =
{
    standard_quality_manager_QueryInterface,
    standard_quality_manager_AddRef,
    standard_quality_manager_Release,
    standard_quality_manager_NotifyTopology,
    standard_quality_manager_NotifyPresentationClock,
    standard_quality_manager_NotifyProcessInput,
    standard_quality_manager_NotifyProcessOutput,
    standard_quality_manager_NotifyQualityEvent,
    standard_quality_manager_Shutdown,
};

HRESULT WINAPI MFCreateStandardQualityManager(IMFQualityManager **manager)
{
    struct quality_manager *object;

    TRACE("%p.\n", manager);

    object = heap_alloc_zero(sizeof(*object));
    if (!object)
        return E_OUTOFMEMORY;

    object->IMFQualityManager_iface.lpVtbl = &standard_quality_manager_vtbl;
    object->refcount = 1;

    *manager = &object->IMFQualityManager_iface;

    return S_OK;
}