mediamute.cpp

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#include "mediamute.h"
#include "mutedsessionevents.h"
 
extern volatile bool g_bMuted;
 
static IMMDeviceEnumerator*        m_pEnumerator                = NULL;
static IMMDevice*                        m_pDeviceOut                    = NULL;
static IAudioSessionManager*        m_AudioSessionManager = NULL;
static IAudioSessionControl*        m_AudioSessionControl    = NULL;
static CMutedSessionEvents *        m_pMutedSessionEvents    = NULL;
MediaMute::MediaMute()
{
    CoInitializeEx( NULL , COINIT_MULTITHREADED );
 
        HRESULT hr;
 
        //实例化 MMDeviceEnumerator 枚举器
        hr = CoCreateInstance(__uuidof(MMDeviceEnumerator), NULL,CLSCTX_ALL, __uuidof(IMMDeviceEnumerator),(void**)&m_pEnumerator);
 
 
        // 默认设备的IMMDevice接口
        hr = m_pEnumerator->GetDefaultAudioEndpoint(eRender, eMultimedia, &m_pDeviceOut);
 
 
        // 得到音频会话接口IAudioSessionManager
        hr = m_pDeviceOut->Activate(__uuidof(m_AudioSessionManager), CLSCTX_ALL, NULL, (void**)&m_AudioSessionManager);
 
 
        // 设置会话(Session)参数
        hr = m_AudioSessionManager->GetAudioSessionControl(NULL,0,&m_AudioSessionControl);
 
 
        // 设置声音改变参数通知
        m_pMutedSessionEvents = new CMutedSessionEvents(m_AudioSessionManager);
        hr = m_AudioSessionControl->RegisterAudioSessionNotification(m_pMutedSessionEvents);
 
 
}
bool MediaMute::UnMute()
{
    // ---- 解注册声音改变参数通知
        if (m_AudioSessionControl!=NULL&&m_pMutedSessionEvents!=NULL)
        {
            m_AudioSessionControl->UnregisterAudioSessionNotification(m_pMutedSessionEvents);
        }
 
        // ---- 释放内存空间
        if (m_AudioSessionControl != NULL)
        {
            m_AudioSessionControl->Release();
            m_AudioSessionControl = NULL;
        }
        if (m_pMutedSessionEvents != NULL)
        {
            m_pMutedSessionEvents->Release();
            m_pMutedSessionEvents = NULL;
        }
        if (m_pDeviceOut != NULL)
        {
            m_pDeviceOut->Release();
            m_pDeviceOut = NULL;
        }
        if(m_AudioSessionManager != NULL)
        {
            m_AudioSessionManager->Release();
            m_AudioSessionManager = NULL;
        }
        if (m_pEnumerator != NULL)
        {
            m_pEnumerator->Release();
            m_pEnumerator = NULL;
        }
 
        CoUninitialize();
 
        return true;
}
bool MediaMute::SetMute(bool mute)
{
    HRESULT hr = S_FALSE;
 
        // 获得音量、静音控制接口
        ISimpleAudioVolume   *pAudioVolume = NULL;
        hr = m_AudioSessionManager->GetSimpleAudioVolume(NULL,0,&pAudioVolume);
        if (FAILED(hr)) return false;
 
        if(SUCCEEDED(hr))
        {
            pAudioVolume->SetMute(mute, &GUID_NULL);
 
            // 更改全局静音状态
            g_bMuted = mute;
        }
 
        if (pAudioVolume != NULL)
        {
            pAudioVolume->Release();
            pAudioVolume = NULL;
        }
        return true;
}