c++ - 映射 ISpMMSysAudio::SetLineId 和 mixerLineId

Question

我想通过调用 ISpMMSysAudio::SetLineId 为 SAPI 设置 lineId。我从我拥有的调音台 handle 中找到了我希望设置的线路。然而，我从调音台获得的线路 ID 并不是 SAPI 所假定的。它导致 SAPI 收听错误的麦克风输入线，从而得到没有输入。

我正在为混音器 handle 获取“DST_WAVEIN”的多路复用器控制，并且然后检查麦克风的哪条源线处于事件状态。我希望将事件行设置为 SAPI 的“输入”。

我通过如下枚举 MUX 控件从调音台获取线路 ID:

int GetSelectedWaveInLine(UINT uMixrId){ int iRetVal = -1; MMRESULT mmResult; HMIXER dwMixerHandle;

mmResult = mixerOpen( (LPHMIXER)&dwMixerHandle, uMixrId, 0L, 0L, 0L);
if (MMSYSERR_NOERROR != mmResult)
{   
    LOG_ERROR("FAILURE: Could not Open mixer, with id: %d. mmResult=%d",uMixrId, mmResult );
    return  -1;
}

MIXERLINE MixerLine;
memset( &MixerLine, 0, sizeof(MIXERLINE) );
MixerLine.cbStruct = sizeof(MIXERLINE);
MixerLine.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_WAVEIN;
mmResult = mixerGetLineInfo( (HMIXEROBJ)dwMixerHandle, &MixerLine, MIXER_GETLINEINFOF_COMPONENTTYPE );
if (MMSYSERR_NOERROR != mmResult)
{
    mixerClose( (HMIXER)dwMixerHandle );
    LOG_ERROR("FAILURE: Could not get WaveIn Destionation Line for the requested source while enumerating. mmResult=%d", mmResult );
    return -1;
}

// get the MUX
MIXERCONTROL mxc;
MIXERLINECONTROLS mxlc;
mxlc.cbStruct = sizeof(MIXERLINECONTROLS);
mxlc.dwLineID = MixerLine.dwLineID;
mxlc.dwControlType = MIXERCONTROL_CONTROLTYPE_MUX;
mxlc.cControls = 1;
mxlc.cbmxctrl = sizeof(MIXERCONTROL);
mxlc.pamxctrl = &mxc;
mmResult = ::mixerGetLineControls(reinterpret_cast<HMIXEROBJ>(uMixrId),
                           &mxlc,
                           MIXER_OBJECTF_HMIXER |
                           MIXER_GETLINECONTROLSF_ONEBYTYPE);
if (MMSYSERR_NOERROR != mmResult)
{
    LOG_INFO0("Could not get Mux control for waveIn line. Get selected id");
    mixerClose( (HMIXER)dwMixerHandle );
    return -1;
}
LOG_INFO("Got mux controls. Total lines associated with mux = %d", mxc.cMultipleItems); 

// from the MUX get as many lines for "MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE" {from dwParam1/dwParam2 }
// then get the boolean control for the line and return the one currently selected
MIXERCONTROLDETAILS_LISTTEXT *pmxcdSelectText = new MIXERCONTROLDETAILS_LISTTEXT[mxc.cMultipleItems];
if (pmxcdSelectText != NULL)
{
    MIXERCONTROLDETAILS mxcd;
    mxcd.cbStruct = sizeof(MIXERCONTROLDETAILS);
    mxcd.dwControlID = mxc.dwControlID;
    mxcd.cChannels = 1;
    mxcd.cMultipleItems = mxc.cMultipleItems;
    mxcd.cbDetails = sizeof(MIXERCONTROLDETAILS_LISTTEXT);
    mxcd.paDetails = pmxcdSelectText;
    if (::mixerGetControlDetails(reinterpret_cast<HMIXEROBJ>(uMixrId),
                                 &mxcd,
                                 MIXER_OBJECTF_HMIXER |
                                 MIXER_GETCONTROLDETAILSF_LISTTEXT)
        != MMSYSERR_NOERROR)
    {
        delete []pmxcdSelectText;
        mixerClose( (HMIXER)dwMixerHandle );
        return -1;
    }
}

//get all the boolean values for the mux
MIXERCONTROLDETAILS_BOOLEAN *pmxcdSelectValue = new MIXERCONTROLDETAILS_BOOLEAN[mxc.cMultipleItems];
if (pmxcdSelectValue != NULL)
{
    MIXERCONTROLDETAILS mxcd;
    mxcd.cbStruct = sizeof(MIXERCONTROLDETAILS);
    mxcd.dwControlID = mxc.dwControlID;
    mxcd.cChannels = 1;
    mxcd.cMultipleItems = mxc.cMultipleItems;
    mxcd.cbDetails = sizeof(MIXERCONTROLDETAILS_BOOLEAN);
    mxcd.paDetails = pmxcdSelectValue;
    if (::mixerGetControlDetails(reinterpret_cast<HMIXEROBJ>(uMixrId),
                                 &mxcd,
                                 MIXER_OBJECTF_HMIXER |
                                 MIXER_GETCONTROLDETAILSF_VALUE)
        != MMSYSERR_NOERROR)
    {
        delete []pmxcdSelectValue;
        mixerClose( (HMIXER)dwMixerHandle );
        return -1;
    }
}

for (int i = 0; i < mxc.cMultipleItems; i++)
{
    if(/*(pmxcdSelectText[i].dwParam2 == MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE) && */pmxcdSelectValue[i].fValue)
    {
        LOG_INFO("Got SELECTED microphone source line. Line index = %d, Line name = %s",i,pmxcdSelectText[i].szName);   
        iRetVal  = i;
        break;
    }
}
//LOG_INFO("Got mux controls. Total lines associated with mux = %d", mxc.cMultipleItems);   
delete []pmxcdSelectText;
delete []pmxcdSelectValue;
mixerClose( (HMIXER)dwMixerHandle );
return iRetVal;

Mixer 返回的索引与 ISpMMSysAudio 使用的索引不匹配。我的语音引擎选择了不同的线路 ID。

谢谢

Answer 1

ISpMMSysAudio::SetLineId 实际上指定了混音器索引，而不是线路 ID。 (令人困惑，我知道。)所以你想要做的是枚举混合器线路以找到与线路 ID 对应的索引，并返回索引。