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麦克风接收到一个声音信号,进度条上则产生一定的变化,声音消失后进度条变化消失. |
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这个要用到DS编程。
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mixerGetControlDetails
The mixerGetControlDetails function retrieves details about a single control associated with an audio line. MMRESULT mixerGetControlDetails( Value Description Remarks QuickInfo See Also
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友情帮顶 额不会啊楼主
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我用了这个函数 可得到的总时一个数据啊 ，我用的定时器，不断调用这个函数，函数如下： int CAudio2Dlg::getAudioInputVolum()
{
MMRESULT rc; // 多媒体函数返回结果变量
HMIXER hMixer; // 混合器设备句柄
MIXERLINE mxl; // 音频线路标准状态信息结构体
MIXERLINECONTROLS mxlc; // 音频线路控制器集合信息结构体
MIXERCONTROL mxc; // 单个音频线路控制器信息结构体
//枚举所有声卡驱动，这个枚举很重要。很多代码调用mixOpen时只是用了第一个设备，即
//mixerOpen(&hMixer, 0 , 0 ,0 )，但是我在这个设备下调用mixerGetLineInfo出问题了，
//可能还是跟声卡驱动有关。
for( int deviceID =0 ; true ; deviceID++ )
{
// 打开混合器设备
rc = mixerOpen(&hMixer, // 返回的设备句柄
deviceID, // 单声卡的设备ID为零
0, // 不使用回调机制
0, // 回调函数参数
MIXER_OBJECTF_MIXER); // MIXER_OBJECTF_MIXER宏的值，表示任选有效设备ID
if( MMSYSERR_NOERROR!=rc )
{
//跳出循环
break;
}
// 打开混合器设备无错的话，则
// MIXERLINE 结构体变量清零
ZeroMemory(&mxl, sizeof(MIXERLINE));
mxl.cbStruct = sizeof(MIXERLINE); // 微软用此办法判断版本
// 指出需要获取的通道，声卡的音频输出用MIXERLINE_COMPONENTTYPE_DST_SPEAKERS
mxl.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_WAVEIN;
// 取得混合器设备的指定线路信息
rc = mixerGetLineInfo((HMIXEROBJ)hMixer,
&mxl,
// 取得MIXERLINE::dwComponentType指定类型的第一个音频线路信息
MIXER_OBJECTF_HMIXER|MIXER_GETLINEINFOF_COMPONENTTYPE);
if( rc!=MMSYSERR_NOERROR )
{
//无法获取声音输入线路，尝试其他声卡
continue;
}
// 取得混合器设备的指定线路信息成功的话，则
// 将连接数保存
DWORD dwConnections = mxl.cConnections;
// 准备获取麦克风设备的ID
DWORD dwLineID = -1;
for( DWORD i=0 ; i<dwConnections; i++ )
{
// 枚举每一个设备，当Source的ID等于当前的迭代记数
mxl.dwSource = i;
// 根据SourceID获得连接的信息
rc = mixerGetLineInfo( (HMIXEROBJ)hMixer, &mxl,
MIXER_OBJECTF_HMIXER | MIXER_GETLINEINFOF_SOURCE );
// 判断函数执行错误
if( MMSYSERR_NOERROR==rc )
{
// 如果当前设备类型是麦克风，则跳出循环。
if( mxl.dwComponentType==MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE )
{
dwLineID = mxl.dwLineID;
break;
}
}
}
// 如果没有找到，返回失败。
if( dwLineID==-1 )
{
//尝试其他声卡
continue;
}
// MIXERCONTROL 结构体变量清零
ZeroMemory(&mxc, sizeof(MIXERCONTROL));
mxc.cbStruct = sizeof(mxc); // 微软用此办法判断版本
// MIXERLINECONTROLS 结构体变量清零
ZeroMemory(&mxlc, sizeof(MIXERLINECONTROLS));
mxlc.cbStruct = sizeof(mxlc); // 微软用此办法判断版本
mxlc.dwLineID = dwLineID; // 上面取得的声卡音频输入线路标识
// 控制类型为控制音量
mxlc.dwControlType = MIXERCONTROL_CONTROLTYPE_VOLUME;
mxlc.cControls = 1; // 使用 MIXERCONTROL 结构体变量个数
mxlc.pamxctrl = &mxc; // MIXERCONTROL 结构体变量指针
mxlc.cbmxctrl = sizeof(mxc); // MIXERCONTROL 结构体变量字节大小
// 取得控制器信息
rc = mixerGetLineControls((HMIXEROBJ)hMixer,
&mxlc,
MIXER_GETLINECONTROLSF_ONEBYTYPE);
// 取得控制器信息成功的话，则
if (MMSYSERR_NOERROR == rc)
{
// 获取控制器中的值的音量范围：mxc.Bounds.lMinimum到mxc.Bounds.lMaximum.
MIXERCONTROLDETAILS mxcd; // 控制器的状态信息
MIXERCONTROLDETAILS_SIGNED volStruct; // 音量结构体变量(就一个成员量)
// MIXERCONTROLDETAILS 结构体变量清零
ZeroMemory(&mxcd, sizeof(mxcd));
mxcd.cbStruct = sizeof(mxcd); // 微软用此办法判断版本
mxcd.dwControlID = mxc.dwControlID; // 上面取得的控制器标识
mxcd.paDetails = &volStruct; // 音量结构体变量指针
mxcd.cbDetails = sizeof(volStruct); // 音量结构体变量字节大小
mxcd.cChannels = 1; // 取得或设置全部通道
// 获取控制器中的值的音量范围：mxc.Bounds.lMinimum到mxc.Bounds.lMaximum.
// 获得音量值
rc = mixerGetControlDetails((HMIXEROBJ)hMixer,
&mxcd,
MIXER_GETCONTROLDETAILSF_VALUE);
if (MMSYSERR_NOERROR == rc)
{
long step = ( mxc.Bounds.lMaximum - mxc.Bounds.lMinimum ) /100;
int index = ( volStruct.lValue - mxc.Bounds.lMinimum) /step ;
printf("音量：%X", volStruct.lValue);
CString str;
str.Format("%d",volStruct.lValue);
m_s = str;
UpdateData(FALSE);
str = "";
return index;
}
}
}
return -1;
CMixer mix;
unsigned m;
/*m = mix.GetVolume();
CString str;
str.Format("%d",m);
m_s = str;
UpdateData(FALSE);
MessageBox(str);*/
}
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参考MSDN98\SAMPLES\VC98\SDK\GRAPHICS\AUDIO\MIXAPP\*.* ？
在Google上搜“mixerGetControlDetails” ？ |
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关键是我看的代码没错啊 可还是获取不到 不知道为什么 一直都是65532 |
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以下节选自MSDN98\SAMPLES\VC98\SDK\GRAPHICS\AUDIO\MIXAPP\MAMETER.C
，仅供参考： //--------------------------------------------------------------------------;
//
// BOOL MixAppControlChangeMeter
//
// Description:
//
//
// Arguments:
// HWND hwnd:
//
// HMIXER hmx:
//
// DWORD dwControlID:
//
// Return (BOOL):
//
// History:
// 09/22/93
//
//--------------------------------------------------------------------------;
BOOL FNLOCAL MixAppControlChangeMeter
(
HWND hwnd,
HMIXER hmx,
DWORD dwControlID
)
{
MMRESULT mmr;
HWND htxt;
PMACONTROLINSTANCE_METER pmaci_meter;
LPMACONTROLINSTANCE pmaci;
LPMIXERLINE pmxl;
LPMIXERCONTROL pmxctrl;
PMIXERCONTROLDETAILS_SIGNED pmxcd_s;
UINT cChannels;
UINT cMultipleItems;
UINT u;
UINT uIndex;
UINT v;
MIXERCONTROLDETAILS mxcd;
HWND hsbFocus;
HWND hsb;
BOOL fSigned;
DWORD dwRange;
DWORD dwValue;
int nValue;
hsbFocus = GetFocus();
if (NULL == hsbFocus)
{
hsbFocus = GetDlgItem(hwnd, IDD_MACONTROL_MULTICHANNEL_BASE);
}
else
{
uIndex = GetDlgCtrlID(hsbFocus);
if (uIndex < IDD_MACONTROL_MULTICHANNEL_BASE)
{
hsbFocus = GetDlgItem(hwnd, IDD_MACONTROL_MULTICHANNEL_BASE);
}
}
//
//
//
pmaci_meter = (PMACONTROLINSTANCE_METER)(UINT)GetWindowLong(hwnd, DWL_USER);
pmaci = pmaci_meter->pmaci;
pmxl = pmaci->pmxl;
pmxctrl = pmaci->pmxctrl;
pmxcd_s = &pmaci_meter->pmxcd_s[0];
fSigned = pmaci_meter->fSigned;
dwRange = pmaci_meter->dwRange;
cChannels = (UINT)pmxl->cChannels;
if (MIXERCONTROL_CONTROLF_UNIFORM & pmxctrl->fdwControl)
cChannels = 1;
//
//
//
mxcd.cbStruct = sizeof(mxcd);
mxcd.dwControlID = pmxctrl->dwControlID;
mxcd.cChannels = cChannels;
mxcd.cMultipleItems = pmxctrl->cMultipleItems;
mxcd.cbDetails = sizeof(*pmxcd_s);
mxcd.paDetails = pmxcd_s;
mmr = mixerGetControlDetails((HMIXEROBJ)pmaci->hmx, &mxcd, MIXER_GETCONTROLDETAILSF_VALUE);
if (MMSYSERR_NOERROR != mmr)
{
AppMsgBox(hwnd, MB_OK | MB_ICONEXCLAMATION,
"mixerGetControlDetails(ctrlid=%.08lXh) failed on hmx=%.04Xh, mmr=%u!",
pmxctrl->dwControlID, pmaci->hmx, mmr);
return (FALSE);
}
cMultipleItems = 1;
if (MIXERCONTROL_CONTROLF_MULTIPLE & pmxctrl->fdwControl)
cMultipleItems = (UINT)pmxctrl->cMultipleItems;
for (u = 0; u < cChannels; u++)
{
for (v = 0; v < cMultipleItems; v++)
{
uIndex = (u * cMultipleItems) + v;
if (fSigned)
{
dwValue = (DWORD)(pmxcd_s[uIndex].lValue -
pmxctrl->Bounds.lMinimum);
}
else
{
dwValue = (DWORD)pmxcd_s[uIndex].lValue;
dwValue -= pmxctrl->Bounds.dwMinimum;
}
nValue = (int)MulDivRN(dwValue, 32767, dwRange);
//
// Windows is stupid and forces an update to scrollbars
// (a flickering paint) even when the position does not
// change... so don""t update if it is already in the
// right position.
//
hsb = GetDlgItem(hwnd, IDD_MACONTROL_MULTICHANNEL_BASE + uIndex);
if (hsbFocus == hsb)
{
htxt = GetDlgItem(hwnd, IDD_MACONTROL_TXT_VALUE);
if (fSigned)
{
AppSetWindowText(htxt, "mapped=%d, lValue=%ld",
nValue,
pmxcd_s[uIndex].lValue);
}
else
{
AppSetWindowText(htxt, "mapped=%d, dwValue=%lu",
nValue,
pmxcd_s[uIndex].lValue);
}
}
if (32767 - nValue == GetScrollPos(hsb, SB_CTL))
continue;
//
// note that we _invert_ the position since a meter will
// increase approaching the top (opposite of scrollbar
// logic)
//
SetScrollPos(hsb, SB_CTL, 32767 - nValue, TRUE);
}
}
//
//
//
mxcd.cbStruct = sizeof(mxcd);
mxcd.dwControlID = pmxctrl->dwControlID;
mxcd.cChannels = 1;
mxcd.cMultipleItems = pmxctrl->cMultipleItems;
mxcd.cbDetails = sizeof(*pmxcd_s);
mxcd.paDetails = pmxcd_s;
mmr = mixerGetControlDetails((HMIXEROBJ)pmaci->hmx, &mxcd, MIXER_GETCONTROLDETAILSF_VALUE);
if (MMSYSERR_NOERROR != mmr)
{
AppMsgBox(hwnd, MB_OK | MB_ICONEXCLAMATION,
"mixerGetControlDetails(ctrlid=%.08lXh) failed on hmx=%.04Xh, mmr=%u!",
pmxctrl->dwControlID, pmaci->hmx, mmr);
return (FALSE);
}
for (v = 0; v < cMultipleItems; v++)
{
uIndex = v;
if (fSigned)
{
dwValue = (DWORD)(pmxcd_s[uIndex].lValue -
pmxctrl->Bounds.lMinimum);
}
else
{
dwValue = (DWORD)pmxcd_s[uIndex].lValue;
dwValue -= pmxctrl->Bounds.dwMinimum;
}
nValue = (int)MulDivRN(dwValue, 32767, dwRange);
hsb = GetDlgItem(hwnd, IDD_MACONTROL_UNIFORM_BASE + uIndex);
if (hsbFocus == hsb)
{
htxt = GetDlgItem(hwnd, IDD_MACONTROL_TXT_VALUE);
if (fSigned)
{
AppSetWindowText(htxt, "mapped=%d, lValue=%ld",
nValue,
pmxcd_s[uIndex].lValue);
}
else
{
AppSetWindowText(htxt, "mapped=%d, dwValue=%lu",
nValue,
pmxcd_s[uIndex].lValue);
}
}
if (32767 - nValue == GetScrollPos(hsb, SB_CTL))
continue;
//
// note that we _invert_ the position since a meter will
// increase approaching the top (opposite of scrollbar
// logic)
//
SetScrollPos(hsb, SB_CTL, 32767 - nValue, TRUE);
}
return (TRUE);
} // MixAppControlChangeMeter()
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好吧 还是调不出来 我才上大二 你说的我也看不懂 全英文的 |
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我学习到了。
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顶一个~！！
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mixer只能用于xp平台，win7下使用com组件
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c++ 如何获取麦克风收到的声音的音量 根据声音绘制进度条
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