IAudioEffectsManager 接口 (audioclient.h)

项目
05/23/2024

为关联的音频流的音频效果管道提供管理功能，允许应用程序获取当前效果列表、设置效果状态，并在效果列表或效果状态更改时注册通知。

继承

IAudioEffectsManager 接口继承自 IUnknown 接口。

方法

IAudioEffectsManager 接口包含以下方法。


IAudioEffectsManager：：GetAudioEffects 获取关联音频流的音频效果的当前列表。
IAudioEffectsManager：：RegisterAudioEffectsChangedNotificationCallback 注册 AudioEffectsChangedNotificationClient 接口。
IAudioEffectsManager：：SetAudioEffectState IAudioEffectsManager：：SetAudioEffectState 方法 (audioclient.h) 设置指定音频效果的状态。
IAudioEffectsManager：：UnregisterAudioEffectsChangedNotificationCallback 取消注册 IAudioEffectsChangedNotificationClient 接口。

注解

通过调用传入 IAudioEffectsManager 接口的接口指针的 IAudioClient：：GetService 获取此接口的实例。

wil::com_ptr_nothrow<IAudioEffectsManager> audioEffectsManager;
RETURN_IF_FAILED(client->GetService(IID_PPV_ARGS(&audioEffectsManager)));

示例

以下示例演示 IAudioEffectsManager.GetAudioEffects 以检测指定音频流上是否存在 AUDIO_EFFECT_TYPE_DEEP_NOISE_SUPPRESSION 效果。

HRESULT IsPlatformDeepNoiseSuppressionPresent(_In_ IAudioClient *client, _Out_ bool *isPresent)
{
    *isPresent = false;
    wil::com_ptr_nothrow<IAudioEffectsManager> audioEffectsManager;
    RETURN_IF_FAILED(client->GetService(IID_PPV_ARGS(&audioEffectsManager)));
    wil::unique_cotaskmem_array_ptr<AUDIO_EFFECT> effects;
    UINT32 numEffects;
    RETURN_IF_FAILED(audioEffectsManager->GetAudioEffects(&effects, &numEffects));

    for (UINT32 i = 0; i < numEffects; i++)
    {
        // Check if noise suppression is part of the current effects
        if (effects[i].id == AUDIO_EFFECT_TYPE_DEEP_NOISE_SUPPRESSION)
        {
            *isPresent = true;
            return S_OK;
        }
    }

    return S_OK;
}

以下示例演示如何使用 IAudioEffectsManager.SetAudioEffectState 禁用 AUDIO_EFFECT_TYPE_DEEP_NOISE_SUPPRESSION 效果。

HRESULT TryDisablePlatformDeepNoiseSuppression(_In_ IAudioClient *client)
{
    wil::com_ptr_nothrow<IAudioEffectsManager> audioEffectsManager;
    RETURN_IF_FAILED(client->GetService(IID_PPV_ARGS(&audioEffectsManager)));
    wil::unique_cotaskmem_array_ptr<AudioEffect> effects;
    UINT32 numEffects;
    RETURN_IF_FAILED(audioEffectsManager->GetAudioEffects(&effects, &numEffects));

    for (UINT32 i = 0; i < numEffects; i++)
    {
        if (effects[i].id == AUDIO_EFFECT_TYPE_DEEP_NOISE_SUPPRESSION)
        {
            // Check if deep noise suppression can be set and if it is currently on
            if (effects[i].canSetState && effects[i].state == AUDIO_EFFECT_STATE_ON)
            {
                HRESULT hr = audioEffectsManager->SetAudioEffectState(effects[i].id, AUDIO_EFFECT_STATE_OFF);

                // If canSetState changed to false, or the effect was removed, SetAudioEffectState
                // can fail with one of the following error codes.
                if (hr != AUDCLNT_E_EFFECT_NOT_AVAILABLE && hr != AUDCLNT_E_EFFECT_STATE_READ_ONLY)
                {
                    return hr;
                }
            }

            return S_OK;
        }
    }

    return S_OK;
}

以下示例演示如何使用 IAudioEffectsManager.SetAudioEffectState 启用 AUDIO_EFFECT_TYPE_DEEP_NOISE_SUPPRESSION 效果。

HRESULT TryEnablePlatformDeepNoiseSuppression(_In_ IAudioClient *client)
{
    wil::com_ptr_nothrow<IAudioEffectsManager> audioEffectsManager;
    RETURN_IF_FAILED(client->GetService(IID_PPV_ARGS(&audioEffectsManager)));
    wil::unique_cotaskmem_array_ptr<AUDIO_EFFECT> effects;
    UINT32 numEffects;
    RETURN_IF_FAILED(audioEffectsManager->GetAudioEffects(&effects, &numEffects));

    for (UINT32 i = 0; i < numEffects; i++)
    {
        if (effects[i].id == AUDIO_EFFECT_TYPE_DEEP_NOISE_SUPPRESSION)
        {
            // Check if deep noise suppression can be set and if it is currently off
            if (effects[i].canSetState && effects[i].state == AUDIO_EFFECT_STATE_OFF)
            {
                HRESULT hr = audioEffectsManager->SetAudioEffectState(effects[i].id, AUDIO_EFFECT_STATE_ON);

                // If canSetState changed to false, or the effect was removed, SetAudioEffectState
                // can fail with one of the following error codes.
                if (hr != AUDCLNT_E_EFFECT_NOT_AVAILABLE && hr != AUDCLNT_E_EFFECT_STATE_READ_ONLY)
                {
                    return hr;
                }
            }

            return S_OK;
        }
        }

        return S_OK;
}

下面的代码示例演示了一个类，该类实现 IAudioEffectsChangedNotificationClient 以在音频效果列表更改或启用效果更改所需的资源时接收通知。在 OnAudioStreamEffectsChanged 回调中，该示例调用 GetAudioEffects 以获取当前效果列表。

class AudioEffectsChangedHandler :
    public winrt::implements<AudioEffectsChangedHandler, IAudioEffectsChangedNotificationClient>
{

    public:
    AudioEffectsChangedHandler(_In_ IAudioClient *client) : m_client(client){}
    STDMETHOD(OnAudioEffectsChanged)()
    {
        OnAudioStreamEffectsChanged(m_client.get());
        return S_OK;
    }
    private:
    wil::com_ptr_nothrow<IAudioClient> m_client;

};

wil::com_ptr_nothrow<IAudioEffectsChangedNotificationClient> g_effectsChangedHandler;

HRESULT RegisterAudioStreamEffectsChangedEvent(_In_ IAudioClient *client)
{
    if (!g_effectsChangedHandler)
    {
        wil::com_ptr_nothrow<IAudioEffectsManager> audioEffectsManager;
        RETURN_IF_FAILED(client->GetService(IID_PPV_ARGS(&audioEffectsManager)));

        // Register for the audio effects changed notification
        g_effectsChangedHandler = winrt::make<AudioEffectsChangedHandler>(client).get();
        RETURN_IF_NULL_ALLOC(g_effectsChangedHandler);

        return audioEffectsManager->RegisterAudioEffectsChangedNotificationCallback(
            g_effectsChangedHandler.get());
    }
    return S_OK;
}

HRESULT UnregisterAudioStreamEffectsChangedEvent(_In_ IAudioClient *client)
{
    if (g_effectsChangedHandler != nullptr)
    {
        wil::com_ptr_nothrow<IAudioEffectsManager> audioEffectsManager;
        RETURN_IF_FAILED(client->GetService(IID_PPV_ARGS(&audioEffectsManager)));

        // Unregister from the audio effects changed notification 
        return audioEffectsManager->UnregisterAudioEffectsChangedNotificationCallback(
            g_effectsChangedHandler.get());
        }

        return S_OK;
}

HRESULT OnAudioStreamEffectsChanged(_In_ IAudioClient *client)
{
    // Re-query the list of effects since there was some change
    wil::com_ptr_nothrow<IAudioEffectsManager> audioEffectsManager;
    RETURN_IF_FAILED(client->GetService(IID_PPV_ARGS(&audioEffectsManager)));
    wil::unique_cotaskmem_array_ptr<AUDIO_EFFECT> effects;
    UINT32 numEffects;
    RETURN_IF_FAILED(audioEffectsManager->GetAudioEffects(&effects, &numEffects));

    for (UINT32 i = 0; i < numEffects; i++)
    {

        // Here the app can check which effects are still enabled, and check if there are new
        // effects that now can be enabled.
        // As an example, the following code enables any effect that can be enabled, if it is not
        // already enabled.
        if (effects[i].canSetState && effects[i].state == AUDIO_EFFECT_STATE_OFF)
        {
            HRESULT hr = audioEffectsManager->SetAudioEffectState(effects[i].id, AUDIO_EFFECT_STATE_ON));
            if (hr == AUDCLNT_E_EFFECT_NOT_AVAILABLE || hr == AUDCLNT_E_EFFECT_STATE_READ_ONLY)
            {
                hr = S_OK;
            }
            RETURN_IF_FAILED(hr);

        }
    }

    return S_OK;
}

要求

要求	值
最低受支持的客户端	Windows 内部版本 22000
标头	audioclient.h

通过

IAudioEffectsManager 接口 (audioclient.h)

继承

方法

注解

示例

要求

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