acmwrapper.c File Reference

#include "dshow.h"
#include "wine/test.h"

Include dependency graph for acmwrapper.c:

Go to the source code of this file.

Macros
#define	COBJMACROS
#define	check_interface(a, b, c)   check_interface_(__LINE__, a, b, c)

Functions
static IBaseFilter *	create_acm_wrapper (void)
static ULONG	get_refcount (void *iface)
static void	check_interface_ (unsigned int line, void *iface_ptr, REFIID iid, BOOL supported)
static void	test_interfaces (void)
static HRESULT WINAPI	outer_QueryInterface (IUnknown *iface, REFIID iid, void **out)
static ULONG WINAPI	outer_AddRef (IUnknown *iface)
static ULONG WINAPI	outer_Release (IUnknown *iface)
static void	test_aggregation (void)
static void	test_enum_pins (void)
static void	test_find_pin (void)
static void	test_pin_info (void)
static void	test_unconnected_filter_state (void)
	START_TEST (acmwrapper)

Variables
static const GUID	test_iid = {0x33333333}
static LONG	outer_ref = 1
static const IUnknownVtbl	outer_vtbl
static IUnknown	test_outer = {&outer_vtbl}

Macro Definition Documentation

check_interface

#define check_interface	(		a,
			b,
			c
	)		check_interface_(__LINE__, a, b, c)

Definition at line 41 of file acmwrapper.c.

COBJMACROS

#define COBJMACROS

Definition at line 21 of file acmwrapper.c.

Function Documentation

check_interface_()

static void check_interface_ ( unsigned int  line, void *  iface_ptr, REFIID  iid, BOOL  supported  )

static

Definition at line 42 of file acmwrapper.c.

{
    IUnknown *iface = iface_ptr;
    HRESULT hr, expected_hr;
    IUnknown *unk;
 
    expected_hr = supported ? S_OK : E_NOINTERFACE;
 
    hr = IUnknown_QueryInterface(iface, iid, (void **)&unk);
    ok_(__FILE__, line)(hr == expected_hr, "Got hr %#lx, expected %#lx.\n", hr, expected_hr);
    if (SUCCEEDED(hr))
        IUnknown_Release(unk);
}

create_acm_wrapper()

static IBaseFilter * create_acm_wrapper ( void  )

static

Definition at line 25 of file acmwrapper.c.

{
    IBaseFilter *filter = NULL;
    HRESULT hr = CoCreateInstance(&CLSID_ACMWrapper, NULL, CLSCTX_INPROC_SERVER,
            &IID_IBaseFilter, (void **)&filter);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    return filter;
}

Referenced by test_enum_pins(), test_find_pin(), test_interfaces(), test_pin_info(), and test_unconnected_filter_state().

get_refcount()

static ULONG get_refcount ( void *  iface )

static

Definition at line 34 of file acmwrapper.c.

{
    IUnknown *unknown = iface;
    IUnknown_AddRef(unknown);
    return IUnknown_Release(unknown);
}

Referenced by test_aggregation(), test_enum_pins(), and test_pin_info().

outer_AddRef()

static ULONG WINAPI outer_AddRef ( IUnknown *  iface )

static

Definition at line 122 of file acmwrapper.c.

{
    return InterlockedIncrement(&outer_ref);
}

outer_QueryInterface()

static HRESULT WINAPI outer_QueryInterface ( IUnknown *  iface, REFIID  iid, void **  out  )

static

Definition at line 109 of file acmwrapper.c.

{
    if (IsEqualGUID(iid, &IID_IUnknown)
            || IsEqualGUID(iid, &IID_IBaseFilter)
            || IsEqualGUID(iid, &test_iid))
    {
        *out = (IUnknown *)0xdeadbeef;
        return S_OK;
    }
    ok(0, "unexpected call %s\n", wine_dbgstr_guid(iid));
    return E_NOINTERFACE;
}

outer_Release()

static ULONG WINAPI outer_Release ( IUnknown *  iface )

static

Definition at line 127 of file acmwrapper.c.

{
    return InterlockedDecrement(&outer_ref);
}

START_TEST()

START_TEST

(

acmwrapper

)

Definition at line 492 of file acmwrapper.c.

{
    CoInitialize(NULL);
 
    test_interfaces();
    test_aggregation();
    test_enum_pins();
    test_find_pin();
    test_pin_info();
    test_unconnected_filter_state();
 
    CoUninitialize();
}

test_aggregation()

static void test_aggregation ( void  )

static

Definition at line 141 of file acmwrapper.c.

{
    IBaseFilter *filter, *filter2;
    IUnknown *unk, *unk2;
    HRESULT hr;
    ULONG ref;
 
    filter = (IBaseFilter *)0xdeadbeef;
    hr = CoCreateInstance(&CLSID_ACMWrapper, &test_outer, CLSCTX_INPROC_SERVER,
            &IID_IBaseFilter, (void **)&filter);
    ok(hr == E_NOINTERFACE, "Got hr %#lx.\n", hr);
    ok(!filter, "Got interface %p.\n", filter);
 
    hr = CoCreateInstance(&CLSID_ACMWrapper, &test_outer, CLSCTX_INPROC_SERVER,
            &IID_IUnknown, (void **)&unk);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ok(outer_ref == 1, "Got unexpected refcount %ld.\n", outer_ref);
    ok(unk != &test_outer, "Returned IUnknown should not be outer IUnknown.\n");
    ref = get_refcount(unk);
    ok(ref == 1, "Got unexpected refcount %ld.\n", ref);
 
    ref = IUnknown_AddRef(unk);
    ok(ref == 2, "Got unexpected refcount %ld.\n", ref);
    ok(outer_ref == 1, "Got unexpected refcount %ld.\n", outer_ref);
 
    ref = IUnknown_Release(unk);
    ok(ref == 1, "Got unexpected refcount %ld.\n", ref);
    ok(outer_ref == 1, "Got unexpected refcount %ld.\n", outer_ref);
 
    hr = IUnknown_QueryInterface(unk, &IID_IUnknown, (void **)&unk2);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ok(unk2 == unk, "Got unexpected IUnknown %p.\n", unk2);
    IUnknown_Release(unk2);
 
    hr = IUnknown_QueryInterface(unk, &IID_IBaseFilter, (void **)&filter);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
 
    hr = IBaseFilter_QueryInterface(filter, &IID_IUnknown, (void **)&unk2);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ok(unk2 == (IUnknown *)0xdeadbeef, "Got unexpected IUnknown %p.\n", unk2);
 
    hr = IBaseFilter_QueryInterface(filter, &IID_IBaseFilter, (void **)&filter2);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ok(filter2 == (IBaseFilter *)0xdeadbeef, "Got unexpected IBaseFilter %p.\n", filter2);
 
    hr = IUnknown_QueryInterface(unk, &test_iid, (void **)&unk2);
    ok(hr == E_NOINTERFACE, "Got hr %#lx.\n", hr);
    ok(!unk2, "Got unexpected IUnknown %p.\n", unk2);
 
    hr = IBaseFilter_QueryInterface(filter, &test_iid, (void **)&unk2);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ok(unk2 == (IUnknown *)0xdeadbeef, "Got unexpected IUnknown %p.\n", unk2);
 
    IBaseFilter_Release(filter);
    ref = IUnknown_Release(unk);
    ok(!ref, "Got unexpected refcount %ld.\n", ref);
    ok(outer_ref == 1, "Got unexpected refcount %ld.\n", outer_ref);
}

Referenced by START_TEST().

test_enum_pins()

static void test_enum_pins ( void  )

static

Definition at line 200 of file acmwrapper.c.

{
    IBaseFilter *filter = create_acm_wrapper();
    IEnumPins *enum1, *enum2;
    ULONG count, ref;
    IPin *pins[3];
    HRESULT hr;
 
    ref = get_refcount(filter);
    ok(ref == 1, "Got unexpected refcount %ld.\n", ref);
 
    hr = IBaseFilter_EnumPins(filter, NULL);
    ok(hr == E_POINTER, "Got hr %#lx.\n", hr);
 
    hr = IBaseFilter_EnumPins(filter, &enum1);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ref = get_refcount(filter);
    ok(ref == 2, "Got unexpected refcount %ld.\n", ref);
    ref = get_refcount(enum1);
    ok(ref == 1, "Got unexpected refcount %ld.\n", ref);
 
    hr = IEnumPins_Next(enum1, 1, NULL, NULL);
    ok(hr == E_POINTER, "Got hr %#lx.\n", hr);
 
    hr = IEnumPins_Next(enum1, 1, pins, NULL);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ref = get_refcount(filter);
    ok(ref == 3, "Got unexpected refcount %ld.\n", ref);
    ref = get_refcount(pins[0]);
    ok(ref == 3, "Got unexpected refcount %ld.\n", ref);
    ref = get_refcount(enum1);
    ok(ref == 1, "Got unexpected refcount %ld.\n", ref);
    IPin_Release(pins[0]);
    ref = get_refcount(filter);
    ok(ref == 2, "Got unexpected refcount %ld.\n", ref);
 
    hr = IEnumPins_Next(enum1, 1, pins, NULL);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ref = get_refcount(filter);
    ok(ref == 3, "Got unexpected refcount %ld.\n", ref);
    ref = get_refcount(pins[0]);
    ok(ref == 3, "Got unexpected refcount %ld.\n", ref);
    ref = get_refcount(enum1);
    ok(ref == 1, "Got unexpected refcount %ld.\n", ref);
    IPin_Release(pins[0]);
    ref = get_refcount(filter);
    ok(ref == 2, "Got unexpected refcount %ld.\n", ref);
 
    hr = IEnumPins_Next(enum1, 1, pins, NULL);
    ok(hr == S_FALSE, "Got hr %#lx.\n", hr);
 
    hr = IEnumPins_Reset(enum1);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
 
    hr = IEnumPins_Next(enum1, 1, pins, &count);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ok(count == 1, "Got count %lu.\n", count);
    IPin_Release(pins[0]);
 
    hr = IEnumPins_Next(enum1, 1, pins, &count);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ok(count == 1, "Got count %lu.\n", count);
    IPin_Release(pins[0]);
 
    hr = IEnumPins_Next(enum1, 1, pins, &count);
    ok(hr == S_FALSE, "Got hr %#lx.\n", hr);
    ok(!count, "Got count %lu.\n", count);
 
    hr = IEnumPins_Reset(enum1);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
 
    hr = IEnumPins_Next(enum1, 2, pins, NULL);
    ok(hr == E_INVALIDARG, "Got hr %#lx.\n", hr);
 
    hr = IEnumPins_Next(enum1, 2, pins, &count);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ok(count == 2, "Got count %lu.\n", count);
    IPin_Release(pins[0]);
    IPin_Release(pins[1]);
 
    hr = IEnumPins_Next(enum1, 2, pins, &count);
    ok(hr == S_FALSE, "Got hr %#lx.\n", hr);
    ok(!count, "Got count %lu.\n", count);
 
    hr = IEnumPins_Reset(enum1);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
 
    hr = IEnumPins_Next(enum1, 3, pins, &count);
    ok(hr == S_FALSE, "Got hr %#lx.\n", hr);
    ok(count == 2, "Got count %lu.\n", count);
    IPin_Release(pins[0]);
    IPin_Release(pins[1]);
 
    hr = IEnumPins_Reset(enum1);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
 
    hr = IEnumPins_Clone(enum1, &enum2);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
 
    hr = IEnumPins_Skip(enum1, 3);
    ok(hr == S_FALSE, "Got hr %#lx.\n", hr);
 
    hr = IEnumPins_Skip(enum1, 2);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
 
    hr = IEnumPins_Skip(enum1, 1);
    ok(hr == S_FALSE, "Got hr %#lx.\n", hr);
 
    hr = IEnumPins_Next(enum1, 1, pins, NULL);
    ok(hr == S_FALSE, "Got hr %#lx.\n", hr);
 
    hr = IEnumPins_Next(enum2, 1, pins, NULL);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    IPin_Release(pins[0]);
 
    IEnumPins_Release(enum2);
    IEnumPins_Release(enum1);
    ref = IBaseFilter_Release(filter);
    ok(!ref, "Got outstanding refcount %ld.\n", ref);
}

Referenced by START_TEST().

test_find_pin()

static void test_find_pin ( void  )

static

Definition at line 321 of file acmwrapper.c.

{
    IBaseFilter *filter = create_acm_wrapper();
    IEnumPins *enum_pins;
    IPin *pin, *pin2;
    HRESULT hr;
    ULONG ref;
 
    hr = IBaseFilter_EnumPins(filter, &enum_pins);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
 
    hr = IBaseFilter_FindPin(filter, L"In", &pin);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    hr = IEnumPins_Next(enum_pins, 1, &pin2, NULL);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ok(pin == pin2, "Pins didn't match.\n");
    IPin_Release(pin);
    IPin_Release(pin2);
 
    hr = IBaseFilter_FindPin(filter, L"Out", &pin);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    hr = IEnumPins_Next(enum_pins, 1, &pin2, NULL);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ok(pin == pin2, "Pins didn't match.\n");
    IPin_Release(pin);
    IPin_Release(pin2);
 
    hr = IBaseFilter_FindPin(filter, L"Input", &pin);
    ok(hr == VFW_E_NOT_FOUND, "Got hr %#lx.\n", hr);
    hr = IBaseFilter_FindPin(filter, L"Output", &pin);
    ok(hr == VFW_E_NOT_FOUND, "Got hr %#lx.\n", hr);
    hr = IBaseFilter_FindPin(filter, L"input pin", &pin);
    ok(hr == VFW_E_NOT_FOUND, "Got hr %#lx.\n", hr);
    hr = IBaseFilter_FindPin(filter, L"output pin", &pin);
    ok(hr == VFW_E_NOT_FOUND, "Got hr %#lx.\n", hr);
 
    IEnumPins_Release(enum_pins);
    ref = IBaseFilter_Release(filter);
    ok(!ref, "Got outstanding refcount %ld.\n", ref);
}

Referenced by START_TEST().

test_interfaces()

static void test_interfaces ( void  )

static

Definition at line 56 of file acmwrapper.c.

{
    IBaseFilter *filter = create_acm_wrapper();
    IPin *pin;
 
    check_interface(filter, &IID_IBaseFilter, TRUE);
    check_interface(filter, &IID_IMediaFilter, TRUE);
    check_interface(filter, &IID_IPersist, TRUE);
    todo_wine check_interface(filter, &IID_IPersistPropertyBag, TRUE);
    check_interface(filter, &IID_IUnknown, TRUE);
 
    check_interface(filter, &IID_IAMFilterMiscFlags, FALSE);
    check_interface(filter, &IID_IBasicAudio, FALSE);
    check_interface(filter, &IID_IBasicVideo, FALSE);
    check_interface(filter, &IID_IKsPropertySet, FALSE);
    check_interface(filter, &IID_IMediaPosition, FALSE);
    check_interface(filter, &IID_IMediaSeeking, FALSE);
    check_interface(filter, &IID_IPin, FALSE);
    check_interface(filter, &IID_IQualityControl, FALSE);
    check_interface(filter, &IID_IQualProp, FALSE);
    check_interface(filter, &IID_IReferenceClock, FALSE);
    check_interface(filter, &IID_IVideoWindow, FALSE);
 
    IBaseFilter_FindPin(filter, L"In", &pin);
 
    check_interface(pin, &IID_IMemInputPin, TRUE);
    check_interface(pin, &IID_IPin, TRUE);
    todo_wine check_interface(pin, &IID_IQualityControl, TRUE);
    check_interface(pin, &IID_IUnknown, TRUE);
 
    check_interface(pin, &IID_IMediaPosition, FALSE);
    check_interface(pin, &IID_IMediaSeeking, FALSE);
 
    IPin_Release(pin);
 
    IBaseFilter_FindPin(filter, L"Out", &pin);
 
    check_interface(pin, &IID_IPin, TRUE);
    todo_wine check_interface(pin, &IID_IMediaPosition, TRUE);
    check_interface(pin, &IID_IMediaSeeking, TRUE);
    check_interface(pin, &IID_IQualityControl, TRUE);
    check_interface(pin, &IID_IUnknown, TRUE);
 
    check_interface(pin, &IID_IAsyncReader, FALSE);
 
    IPin_Release(pin);
 
    IBaseFilter_Release(filter);
}

Referenced by START_TEST().

test_pin_info()

static void test_pin_info ( void  )

static

Definition at line 362 of file acmwrapper.c.

{
    IBaseFilter *filter = create_acm_wrapper();
    PIN_DIRECTION dir;
    PIN_INFO info;
    HRESULT hr;
    WCHAR *id;
    ULONG ref;
    IPin *pin;
 
    hr = IBaseFilter_FindPin(filter, L"In", &pin);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ref = get_refcount(filter);
    ok(ref == 2, "Got unexpected refcount %ld.\n", ref);
    ref = get_refcount(pin);
    ok(ref == 2, "Got unexpected refcount %ld.\n", ref);
 
    hr = IPin_QueryPinInfo(pin, &info);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ok(info.pFilter == filter, "Expected filter %p, got %p.\n", filter, info.pFilter);
    ok(info.dir == PINDIR_INPUT, "Got direction %d.\n", info.dir);
    ok(!wcscmp(info.achName, L"Input"), "Got name %s.\n", debugstr_w(info.achName));
    ref = get_refcount(filter);
    ok(ref == 3, "Got unexpected refcount %ld.\n", ref);
    ref = get_refcount(pin);
    ok(ref == 3, "Got unexpected refcount %ld.\n", ref);
    IBaseFilter_Release(info.pFilter);
 
    hr = IPin_QueryDirection(pin, &dir);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ok(dir == PINDIR_INPUT, "Got direction %d.\n", dir);
 
    hr = IPin_QueryId(pin, &id);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ok(!wcscmp(id, L"In"), "Got id %s.\n", wine_dbgstr_w(id));
    CoTaskMemFree(id);
 
    hr = IPin_QueryInternalConnections(pin, NULL, NULL);
    ok(hr == E_NOTIMPL, "Got hr %#lx.\n", hr);
 
    IPin_Release(pin);
 
    hr = IBaseFilter_FindPin(filter, L"Out", &pin);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
 
    check_interface(pin, &IID_IPin, TRUE);
    check_interface(pin, &IID_IMediaSeeking, TRUE);
 
    hr = IPin_QueryPinInfo(pin, &info);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ok(info.pFilter == filter, "Expected filter %p, got %p.\n", filter, info.pFilter);
    ok(info.dir == PINDIR_OUTPUT, "Got direction %d.\n", info.dir);
    ok(!wcscmp(info.achName, L"Output"), "Got name %s.\n", debugstr_w(info.achName));
    IBaseFilter_Release(info.pFilter);
 
    hr = IPin_QueryDirection(pin, &dir);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ok(dir == PINDIR_OUTPUT, "Got direction %d.\n", dir);
 
    hr = IPin_QueryId(pin, &id);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ok(!wcscmp(id, L"Out"), "Got id %s.\n", wine_dbgstr_w(id));
    CoTaskMemFree(id);
 
    hr = IPin_QueryInternalConnections(pin, NULL, NULL);
    ok(hr == E_NOTIMPL, "Got hr %#lx.\n", hr);
 
    IPin_Release(pin);
 
    ref = IBaseFilter_Release(filter);
    ok(!ref, "Got outstanding refcount %ld.\n", ref);
}

Referenced by START_TEST().

test_unconnected_filter_state()

static void test_unconnected_filter_state ( void  )

static

Definition at line 435 of file acmwrapper.c.

{
    IBaseFilter *filter = create_acm_wrapper();
    FILTER_STATE state;
    HRESULT hr;
    ULONG ref;
 
    hr = IBaseFilter_GetState(filter, 0, &state);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ok(state == State_Stopped, "Got state %u.\n", state);
 
    hr = IBaseFilter_Pause(filter);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
 
    hr = IBaseFilter_GetState(filter, 0, &state);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ok(state == State_Paused, "Got state %u.\n", state);
 
    hr = IBaseFilter_Run(filter, 0);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
 
    hr = IBaseFilter_GetState(filter, 0, &state);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ok(state == State_Running, "Got state %u.\n", state);
 
    hr = IBaseFilter_Pause(filter);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
 
    hr = IBaseFilter_GetState(filter, 0, &state);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ok(state == State_Paused, "Got state %u.\n", state);
 
    hr = IBaseFilter_Stop(filter);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
 
    hr = IBaseFilter_GetState(filter, 0, &state);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ok(state == State_Stopped, "Got state %u.\n", state);
 
    hr = IBaseFilter_Run(filter, 0);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
 
    hr = IBaseFilter_GetState(filter, 0, &state);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ok(state == State_Running, "Got state %u.\n", state);
 
    hr = IBaseFilter_Stop(filter);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
 
    hr = IBaseFilter_GetState(filter, 0, &state);
    ok(hr == S_OK, "Got hr %#lx.\n", hr);
    ok(state == State_Stopped, "Got state %u.\n", state);
 
    ref = IBaseFilter_Release(filter);
    ok(!ref, "Got outstanding refcount %ld.\n", ref);
}

Referenced by START_TEST().

Variable Documentation

outer_ref

LONG outer_ref = 1

static

Definition at line 107 of file acmwrapper.c.

Referenced by outer_AddRef(), outer_Release(), and test_aggregation().

outer_vtbl

const IUnknownVtbl outer_vtbl

static

Initial value:

=
{
    outer_QueryInterface,
    outer_AddRef,
    outer_Release,
}

Definition at line 132 of file acmwrapper.c.

test_iid

const GUID test_iid = {0x33333333}

static

Definition at line 106 of file acmwrapper.c.

Referenced by outer_QueryInterface(), and test_aggregation().

test_outer

IUnknown test_outer = {&outer_vtbl}

static

Definition at line 139 of file acmwrapper.c.

Referenced by test_aggregation().