Sweden-Number/dlls/evr/mixer.c

/*
 * Copyright 2020 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
 */

#define COBJMACROS

#include "wine/debug.h"
#include "evr.h"
#include "d3d9.h"
#include "mfapi.h"
#include "mferror.h"

#include "evr_classes.h"

WINE_DEFAULT_DEBUG_CHANNEL(evr);

#define MAX_MIXER_INPUT_STREAMS 16

struct input_stream
{
    unsigned int id;
    IMFAttributes *attributes;
};

struct video_mixer
{
    IMFTransform IMFTransform_iface;
    IMFVideoDeviceID IMFVideoDeviceID_iface;
    IMFTopologyServiceLookupClient IMFTopologyServiceLookupClient_iface;
    IMFVideoMixerControl2 IMFVideoMixerControl2_iface;
    LONG refcount;

    struct input_stream inputs[MAX_MIXER_INPUT_STREAMS];
    unsigned int input_ids[MAX_MIXER_INPUT_STREAMS];
    unsigned int input_count;
    CRITICAL_SECTION cs;
};

static struct video_mixer *impl_from_IMFTransform(IMFTransform *iface)
{
    return CONTAINING_RECORD(iface, struct video_mixer, IMFTransform_iface);
}

static struct video_mixer *impl_from_IMFVideoDeviceID(IMFVideoDeviceID *iface)
{
    return CONTAINING_RECORD(iface, struct video_mixer, IMFVideoDeviceID_iface);
}

static struct video_mixer *impl_from_IMFTopologyServiceLookupClient(IMFTopologyServiceLookupClient *iface)
{
    return CONTAINING_RECORD(iface, struct video_mixer, IMFTopologyServiceLookupClient_iface);
}

static struct video_mixer *impl_from_IMFVideoMixerControl2(IMFVideoMixerControl2 *iface)
{
    return CONTAINING_RECORD(iface, struct video_mixer, IMFVideoMixerControl2_iface);
}

static int video_mixer_compare_input_id(const void *a, const void *b)
{
    const unsigned int *key = a;
    const struct input_stream *input = b;

    if (*key > input->id) return 1;
    if (*key < input->id) return -1;
    return 0;
}

static struct input_stream * video_mixer_get_input(const struct video_mixer *mixer, unsigned int id)
{
    return bsearch(&id, mixer->inputs, mixer->input_count, sizeof(*mixer->inputs), video_mixer_compare_input_id);
}

static void video_mixer_init_input(struct input_stream *stream)
{
    if (SUCCEEDED(MFCreateAttributes(&stream->attributes, 1)))
        IMFAttributes_SetUINT32(stream->attributes, &MF_SA_REQUIRED_SAMPLE_COUNT, 1);
}

static HRESULT WINAPI video_mixer_transform_QueryInterface(IMFTransform *iface, REFIID riid, void **obj)
{
    struct video_mixer *mixer = impl_from_IMFTransform(iface);

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

    if (IsEqualIID(riid, &IID_IMFTransform) ||
            IsEqualIID(riid, &IID_IUnknown))
    {
        *obj = iface;
    }
    else if (IsEqualIID(riid, &IID_IMFVideoDeviceID))
    {
        *obj = &mixer->IMFVideoDeviceID_iface;
    }
    else if (IsEqualIID(riid, &IID_IMFTopologyServiceLookupClient))
    {
        *obj = &mixer->IMFTopologyServiceLookupClient_iface;
    }
    else if (IsEqualIID(riid, &IID_IMFVideoMixerControl2) ||
            IsEqualIID(riid, &IID_IMFVideoMixerControl))
    {
        *obj = &mixer->IMFVideoMixerControl2_iface;
    }
    else
    {
        WARN("Unsupported interface %s.\n", debugstr_guid(riid));
        *obj = NULL;
        return E_NOINTERFACE;
    }

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

static ULONG WINAPI video_mixer_transform_AddRef(IMFTransform *iface)
{
    struct video_mixer *mixer = impl_from_IMFTransform(iface);
    ULONG refcount = InterlockedIncrement(&mixer->refcount);

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

    return refcount;
}

static ULONG WINAPI video_mixer_transform_Release(IMFTransform *iface)
{
    struct video_mixer *mixer = impl_from_IMFTransform(iface);
    ULONG refcount = InterlockedDecrement(&mixer->refcount);
    unsigned int i;

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

    if (!refcount)
    {
        for (i = 0; i < mixer->input_count; ++i)
        {
            if (mixer->inputs[i].attributes)
                IMFAttributes_Release(mixer->inputs[i].attributes);
        }
        DeleteCriticalSection(&mixer->cs);
        free(mixer);
    }

    return refcount;
}

static HRESULT WINAPI video_mixer_transform_GetStreamLimits(IMFTransform *iface, DWORD *input_minimum,
        DWORD *input_maximum, DWORD *output_minimum, DWORD *output_maximum)
{
    TRACE("%p, %p, %p, %p, %p.\n", iface, input_minimum, input_maximum, output_minimum, output_maximum);

    *input_minimum = 1;
    *input_maximum = 16;
    *output_minimum = 1;
    *output_maximum = 1;

    return S_OK;
}

static HRESULT WINAPI video_mixer_transform_GetStreamCount(IMFTransform *iface, DWORD *inputs, DWORD *outputs)
{
    struct video_mixer *mixer = impl_from_IMFTransform(iface);

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

    EnterCriticalSection(&mixer->cs);
    if (inputs) *inputs = mixer->input_count;
    if (outputs) *outputs = 1;
    LeaveCriticalSection(&mixer->cs);

    return S_OK;
}

static HRESULT WINAPI video_mixer_transform_GetStreamIDs(IMFTransform *iface, DWORD input_size, DWORD *inputs,
        DWORD output_size, DWORD *outputs)
{
    struct video_mixer *mixer = impl_from_IMFTransform(iface);
    HRESULT hr = S_OK;

    TRACE("%p, %u, %p, %u, %p.\n", iface, input_size, inputs, output_size, outputs);

    EnterCriticalSection(&mixer->cs);
    if (mixer->input_count > input_size || !output_size)
        hr = MF_E_BUFFERTOOSMALL;
    else if (inputs)
        memcpy(inputs, mixer->input_ids, mixer->input_count * sizeof(*inputs));
    if (outputs) *outputs = 0;
    LeaveCriticalSection(&mixer->cs);

    return hr;
}

static HRESULT WINAPI video_mixer_transform_GetInputStreamInfo(IMFTransform *iface, DWORD id, MFT_INPUT_STREAM_INFO *info)
{
    struct video_mixer *mixer = impl_from_IMFTransform(iface);
    struct input_stream *input;
    HRESULT hr = S_OK;

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

    EnterCriticalSection(&mixer->cs);
    if (!(input = video_mixer_get_input(mixer, id)))
        hr = MF_E_INVALIDSTREAMNUMBER;
    else
    {
        memset(info, 0, sizeof(*info));
        if (id)
            info->dwFlags |= MFT_INPUT_STREAM_REMOVABLE | MFT_INPUT_STREAM_OPTIONAL;
    }
    LeaveCriticalSection(&mixer->cs);

    return hr;
}

static HRESULT WINAPI video_mixer_transform_GetOutputStreamInfo(IMFTransform *iface, DWORD id, MFT_OUTPUT_STREAM_INFO *info)
{
    TRACE("%p, %u, %p.\n", iface, id, info);

    if (id)
        return MF_E_INVALIDSTREAMNUMBER;

    memset(info, 0, sizeof(*info));

    return S_OK;
}

static HRESULT WINAPI video_mixer_transform_GetAttributes(IMFTransform *iface, IMFAttributes **attributes)
{
    FIXME("%p, %p.\n", iface, attributes);

    return E_NOTIMPL;
}

static HRESULT WINAPI video_mixer_transform_GetInputStreamAttributes(IMFTransform *iface, DWORD id,
        IMFAttributes **attributes)
{
    struct video_mixer *mixer = impl_from_IMFTransform(iface);
    struct input_stream *input;
    HRESULT hr = S_OK;

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

    EnterCriticalSection(&mixer->cs);

    if (!(input = video_mixer_get_input(mixer, id)))
        hr = MF_E_INVALIDSTREAMNUMBER;
    else
    {
        *attributes = input->attributes;
        if (*attributes)
            IMFAttributes_AddRef(*attributes);
    }

    LeaveCriticalSection(&mixer->cs);

    return hr;
}

static HRESULT WINAPI video_mixer_transform_GetOutputStreamAttributes(IMFTransform *iface, DWORD id,
        IMFAttributes **attributes)
{
    TRACE("%p, %u, %p.\n", iface, id, attributes);

    return E_NOTIMPL;
}

static HRESULT WINAPI video_mixer_transform_DeleteInputStream(IMFTransform *iface, DWORD id)
{
    struct video_mixer *mixer = impl_from_IMFTransform(iface);
    struct input_stream *input;
    HRESULT hr = S_OK;
    unsigned int idx;

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

    EnterCriticalSection(&mixer->cs);

    /* Can't delete reference stream. */
    if (!id || !(input = video_mixer_get_input(mixer, id)))
        hr = MF_E_INVALIDSTREAMNUMBER;
    else
    {
        mixer->input_count--;
        idx = input - mixer->inputs;
        if (idx < mixer->input_count)
        {
            if (mixer->inputs[idx].attributes)
                IMFAttributes_Release(mixer->inputs[idx].attributes);
            memmove(&mixer->inputs[idx], &mixer->inputs[idx + 1], (mixer->input_count - idx) * sizeof(*mixer->inputs));
            memmove(&mixer->input_ids[idx], &mixer->input_ids[idx + 1], (mixer->input_count - idx) *
                    sizeof(*mixer->input_ids));
        }
    }

    LeaveCriticalSection(&mixer->cs);

    return hr;
}

static int video_mixer_add_input_sort_compare(const void *a, const void *b)
{
    const struct input_stream *left = a, *right = b;
    return left->id != right->id ? (left->id < right->id ? -1 : 1) : 0;
};

static HRESULT WINAPI video_mixer_transform_AddInputStreams(IMFTransform *iface, DWORD count, DWORD *ids)
{
    struct video_mixer *mixer = impl_from_IMFTransform(iface);
    struct input_stream inputs[MAX_MIXER_INPUT_STREAMS] = { {0} };
    struct input_stream *input;
    unsigned int i, len;
    HRESULT hr = S_OK;

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

    if (!ids)
        return E_POINTER;

    EnterCriticalSection(&mixer->cs);
    if (count > ARRAY_SIZE(mixer->inputs) - mixer->input_count)
        hr = E_INVALIDARG;
    else
    {
        /* Test for collisions. */
        memcpy(inputs, mixer->inputs, mixer->input_count * sizeof(*inputs));
        for (i = 0; i < count; ++i)
            inputs[i + mixer->input_count].id = ids[i];

        len = mixer->input_count + count;

        qsort(inputs, len, sizeof(*inputs), video_mixer_add_input_sort_compare);

        for (i = 1; i < len; ++i)
        {
            if (inputs[i - 1].id == inputs[i].id)
            {
                hr = E_INVALIDARG;
                break;
            }
        }

        if (SUCCEEDED(hr))
        {
            for (i = 0; i < count; ++i)
            {
                if ((input = bsearch(&ids[i], inputs, len, sizeof(*inputs), video_mixer_compare_input_id)))
                    video_mixer_init_input(input);
            }
            memcpy(&mixer->input_ids[mixer->input_count], ids, count * sizeof(*ids));
            memcpy(mixer->inputs, inputs, len * sizeof(*inputs));
            mixer->input_count += count;
        }
    }
    LeaveCriticalSection(&mixer->cs);

    return hr;
}

static HRESULT WINAPI video_mixer_transform_GetInputAvailableType(IMFTransform *iface, DWORD id, DWORD index,
        IMFMediaType **type)
{
    FIXME("%p, %u, %u, %p.\n", iface, id, index, type);

    return E_NOTIMPL;
}

static HRESULT WINAPI video_mixer_transform_GetOutputAvailableType(IMFTransform *iface, DWORD id, DWORD index,
        IMFMediaType **type)
{
    FIXME("%p, %u, %u, %p.\n", iface, id, index, type);

    return E_NOTIMPL;
}

static HRESULT WINAPI video_mixer_transform_SetInputType(IMFTransform *iface, DWORD id, IMFMediaType *type, DWORD flags)
{
    FIXME("%p, %u, %p, %#x.\n", iface, id, type, flags);

    return E_NOTIMPL;
}

static HRESULT WINAPI video_mixer_transform_SetOutputType(IMFTransform *iface, DWORD id, IMFMediaType *type, DWORD flags)
{
    FIXME("%p, %u, %p, %#x.\n", iface, id, type, flags);

    return E_NOTIMPL;
}

static HRESULT WINAPI video_mixer_transform_GetInputCurrentType(IMFTransform *iface, DWORD id, IMFMediaType **type)
{
    FIXME("%p, %u, %p.\n", iface, id, type);

    return E_NOTIMPL;
}

static HRESULT WINAPI video_mixer_transform_GetOutputCurrentType(IMFTransform *iface, DWORD id, IMFMediaType **type)
{
    FIXME("%p, %u, %p.\n", iface, id, type);

    return E_NOTIMPL;
}

static HRESULT WINAPI video_mixer_transform_GetInputStatus(IMFTransform *iface, DWORD id, DWORD *flags)
{
    FIXME("%p, %u, %p.\n", iface, id, flags);

    return E_NOTIMPL;
}

static HRESULT WINAPI video_mixer_transform_GetOutputStatus(IMFTransform *iface, DWORD *flags)
{
    FIXME("%p, %p.\n", iface, flags);

    return E_NOTIMPL;
}

static HRESULT WINAPI video_mixer_transform_SetOutputBounds(IMFTransform *iface, LONGLONG lower, LONGLONG upper)
{
    FIXME("%p, %s, %s.\n", iface, wine_dbgstr_longlong(lower), wine_dbgstr_longlong(upper));

    return E_NOTIMPL;
}

static HRESULT WINAPI video_mixer_transform_ProcessEvent(IMFTransform *iface, DWORD id, IMFMediaEvent *event)
{
    FIXME("%p, %u, %p.\n", iface, id, event);

    return E_NOTIMPL;
}

static HRESULT WINAPI video_mixer_transform_ProcessMessage(IMFTransform *iface, MFT_MESSAGE_TYPE message, ULONG_PTR param)
{
    FIXME("%p, %u, %#lx.\n", iface, message, param);

    return E_NOTIMPL;
}

static HRESULT WINAPI video_mixer_transform_ProcessInput(IMFTransform *iface, DWORD id, IMFSample *sample, DWORD flags)
{
    FIXME("%p, %u, %p, %#x.\n", iface, id, sample, flags);

    return E_NOTIMPL;
}

static HRESULT WINAPI video_mixer_transform_ProcessOutput(IMFTransform *iface, DWORD flags, DWORD count,
        MFT_OUTPUT_DATA_BUFFER *samples, DWORD *status)
{
    FIXME("%p, %#x, %u, %p, %p.\n", iface, flags, count, samples, status);

    return E_NOTIMPL;
}

static const IMFTransformVtbl video_mixer_transform_vtbl =
{
    video_mixer_transform_QueryInterface,
    video_mixer_transform_AddRef,
    video_mixer_transform_Release,
    video_mixer_transform_GetStreamLimits,
    video_mixer_transform_GetStreamCount,
    video_mixer_transform_GetStreamIDs,
    video_mixer_transform_GetInputStreamInfo,
    video_mixer_transform_GetOutputStreamInfo,
    video_mixer_transform_GetAttributes,
    video_mixer_transform_GetInputStreamAttributes,
    video_mixer_transform_GetOutputStreamAttributes,
    video_mixer_transform_DeleteInputStream,
    video_mixer_transform_AddInputStreams,
    video_mixer_transform_GetInputAvailableType,
    video_mixer_transform_GetOutputAvailableType,
    video_mixer_transform_SetInputType,
    video_mixer_transform_SetOutputType,
    video_mixer_transform_GetInputCurrentType,
    video_mixer_transform_GetOutputCurrentType,
    video_mixer_transform_GetInputStatus,
    video_mixer_transform_GetOutputStatus,
    video_mixer_transform_SetOutputBounds,
    video_mixer_transform_ProcessEvent,
    video_mixer_transform_ProcessMessage,
    video_mixer_transform_ProcessInput,
    video_mixer_transform_ProcessOutput,
};

static HRESULT WINAPI video_mixer_device_id_QueryInterface(IMFVideoDeviceID *iface, REFIID riid, void **obj)
{
    struct video_mixer *mixer = impl_from_IMFVideoDeviceID(iface);
    return IMFTransform_QueryInterface(&mixer->IMFTransform_iface, riid, obj);
}

static ULONG WINAPI video_mixer_device_id_AddRef(IMFVideoDeviceID *iface)
{
    struct video_mixer *mixer = impl_from_IMFVideoDeviceID(iface);
    return IMFTransform_AddRef(&mixer->IMFTransform_iface);
}

static ULONG WINAPI video_mixer_device_id_Release(IMFVideoDeviceID *iface)
{
    struct video_mixer *mixer = impl_from_IMFVideoDeviceID(iface);
    return IMFTransform_Release(&mixer->IMFTransform_iface);
}

static HRESULT WINAPI video_mixer_device_id_GetDeviceID(IMFVideoDeviceID *iface, IID *device_id)
{
    TRACE("%p, %p.\n", iface, device_id);

    if (!device_id)
        return E_POINTER;

    memcpy(device_id, &IID_IDirect3DDevice9, sizeof(*device_id));

    return S_OK;
}

static const IMFVideoDeviceIDVtbl video_mixer_device_id_vtbl =
{
    video_mixer_device_id_QueryInterface,
    video_mixer_device_id_AddRef,
    video_mixer_device_id_Release,
    video_mixer_device_id_GetDeviceID,
};

static HRESULT WINAPI video_mixer_service_client_QueryInterface(IMFTopologyServiceLookupClient *iface,
        REFIID riid, void **obj)
{
    struct video_mixer *mixer = impl_from_IMFTopologyServiceLookupClient(iface);
    return IMFTransform_QueryInterface(&mixer->IMFTransform_iface, riid, obj);
}

static ULONG WINAPI video_mixer_service_client_AddRef(IMFTopologyServiceLookupClient *iface)
{
    struct video_mixer *mixer = impl_from_IMFTopologyServiceLookupClient(iface);
    return IMFTransform_AddRef(&mixer->IMFTransform_iface);
}

static ULONG WINAPI video_mixer_service_client_Release(IMFTopologyServiceLookupClient *iface)
{
    struct video_mixer *mixer = impl_from_IMFTopologyServiceLookupClient(iface);
    return IMFTransform_Release(&mixer->IMFTransform_iface);
}

static HRESULT WINAPI video_mixer_service_client_InitServicePointers(IMFTopologyServiceLookupClient *iface,
        IMFTopologyServiceLookup *service_lookup)
{
    FIXME("%p, %p.\n", iface, service_lookup);

    return E_NOTIMPL;
}

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

    return E_NOTIMPL;
}

static const IMFTopologyServiceLookupClientVtbl video_mixer_service_client_vtbl =
{
    video_mixer_service_client_QueryInterface,
    video_mixer_service_client_AddRef,
    video_mixer_service_client_Release,
    video_mixer_service_client_InitServicePointers,
    video_mixer_service_client_ReleaseServicePointers,
};

static HRESULT WINAPI video_mixer_control_QueryInterface(IMFVideoMixerControl2 *iface, REFIID riid, void **obj)
{
    struct video_mixer *mixer = impl_from_IMFVideoMixerControl2(iface);
    return IMFTransform_QueryInterface(&mixer->IMFTransform_iface, riid, obj);
}

static ULONG WINAPI video_mixer_control_AddRef(IMFVideoMixerControl2 *iface)
{
    struct video_mixer *mixer = impl_from_IMFVideoMixerControl2(iface);
    return IMFTransform_AddRef(&mixer->IMFTransform_iface);
}

static ULONG WINAPI video_mixer_control_Release(IMFVideoMixerControl2 *iface)
{
    struct video_mixer *mixer = impl_from_IMFVideoMixerControl2(iface);
    return IMFTransform_Release(&mixer->IMFTransform_iface);
}

static HRESULT WINAPI video_mixer_control_SetStreamZOrder(IMFVideoMixerControl2 *iface, DWORD stream_id, DWORD zorder)
{
    FIXME("%p, %u, %u.\n", iface, stream_id, zorder);

    return E_NOTIMPL;
}

static HRESULT WINAPI video_mixer_control_GetStreamZOrder(IMFVideoMixerControl2 *iface, DWORD stream_id, DWORD *zorder)
{
    FIXME("%p, %u, %p.\n", iface, stream_id, zorder);

    return E_NOTIMPL;
}

static HRESULT WINAPI video_mixer_control_SetStreamOutputRect(IMFVideoMixerControl2 *iface, DWORD stream_id,
        const MFVideoNormalizedRect *rect)
{
    FIXME("%p, %u, %p.\n", iface, stream_id, rect);

    return E_NOTIMPL;
}

static HRESULT WINAPI video_mixer_control_GetStreamOutputRect(IMFVideoMixerControl2 *iface, DWORD stream_id,
        MFVideoNormalizedRect *rect)
{
    FIXME("%p, %u, %p.\n", iface, stream_id, rect);

    return E_NOTIMPL;
}

static HRESULT WINAPI video_mixer_control_SetMixingPrefs(IMFVideoMixerControl2 *iface, DWORD flags)
{
    FIXME("%p, %#x.\n", iface, flags);

    return E_NOTIMPL;
}

static HRESULT WINAPI video_mixer_control_GetMixingPrefs(IMFVideoMixerControl2 *iface, DWORD *flags)
{
    FIXME("%p, %p.\n", iface, flags);

    return E_NOTIMPL;
}

static const IMFVideoMixerControl2Vtbl video_mixer_control_vtbl =
{
    video_mixer_control_QueryInterface,
    video_mixer_control_AddRef,
    video_mixer_control_Release,
    video_mixer_control_SetStreamZOrder,
    video_mixer_control_GetStreamZOrder,
    video_mixer_control_SetStreamOutputRect,
    video_mixer_control_GetStreamOutputRect,
    video_mixer_control_SetMixingPrefs,
    video_mixer_control_GetMixingPrefs,
};

HRESULT WINAPI MFCreateVideoMixer(IUnknown *owner, REFIID riid_device, REFIID riid, void **obj)
{
    TRACE("%p, %s, %s, %p.\n", owner, debugstr_guid(riid_device), debugstr_guid(riid), obj);

    *obj = NULL;

    if (!IsEqualIID(riid_device, &IID_IDirect3DDevice9))
        return E_INVALIDARG;

    return CoCreateInstance(&CLSID_MFVideoMixer9, owner, CLSCTX_INPROC_SERVER, riid, obj);
}

HRESULT evr_mixer_create(IUnknown *outer, void **out)
{
    struct video_mixer *object;

    if (outer)
        return E_NOINTERFACE;

    if (!(object = calloc(1, sizeof(*object))))
        return E_OUTOFMEMORY;

    object->IMFTransform_iface.lpVtbl = &video_mixer_transform_vtbl;
    object->IMFVideoDeviceID_iface.lpVtbl = &video_mixer_device_id_vtbl;
    object->IMFTopologyServiceLookupClient_iface.lpVtbl = &video_mixer_service_client_vtbl;
    object->IMFVideoMixerControl2_iface.lpVtbl = &video_mixer_control_vtbl;
    object->refcount = 1;
    object->input_count = 1;
    video_mixer_init_input(&object->inputs[0]);
    InitializeCriticalSection(&object->cs);

    *out = &object->IMFTransform_iface;

    return S_OK;
}

HRESULT WINAPI MFCreateVideoSampleFromSurface(IUnknown *surface, IMFSample **sample)
{
    FIXME("%p, %p.\n", surface, sample);

    return E_NOTIMPL;
}