如何区分音量控制中：Speaker(播放控制)里的microphone和Wave in（录音控制）里的microphone?

[shadowWind]

我有两个声卡A,B.
A: 只有Speaker音量控制中有microphone这一项。

我能够用mixer系列函数控制它的volume和mute，
只要把 MIXERLINE结构中的dwComponentType设为MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE 就行

B: Speaker音量控制和Wave in音量控制中都有 microphone这一项

我用了与A中同样的代码，受控制的只有 wave in中的microphone
怎样才能够控制Speaker中的microphone的volume和mute?

我已经是过其他所有可选的dwComponentType，都不行。
我的想法：
根据A中的现象，dwComponentType应该还是用MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE;
应该有别的参数设置可以区分这两个microphone

但我不知道还有哪个地方需要设置，请指点，多谢！

[DentistryDoctor]

mixerGetID?来同的设置ID不同。

[nwpulipeng]

帮顶混分

[shadowWind]

up

[pepsi1980]

看完题目头就晕了.......

[shadowWind]

up
:(

[shadowWind]

又研究了一遍vfwMixer的代码。
自己解决了，做个总结，顺便结贴。

原来获取ControlID的方法中：
使用::mixerGetLineInfo(）是第三个参数用了MIXER_GETLINEINFOF_COMPONENTTYPE，找了很久没有发现这样有什么途径可以区分 dwComponentType=MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE 是到底取得是录音设备还是播放设备。

因此，改用了vfwMixer中获取ControlID的方法。
即：::mixerGetLineInfo(）是第三个参数用MIXER_GETLINEINFOF_DESTINATION
然后，MIXERLINE数据的dwDestination成员分别置0和1时，分别代表的是录音和播放设备。
这样在遍历中，当dwDestination为0时，若相关联的MixerControl的dwControlType为MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE，则找到了一个mic录音源
反之，dwDestiantion为1时，。。。。。，则是播放控制中的microphone.

下面附相关代码(参照vfwMixer代码做了修改)：

BOOL GetControlID(DWORD ComponentType, DWORD ControlType ,BOOL DESTINATION)
{
MMRESULT err;
unsigned long j, k, l;

/* Get info about all the destination lines for this mixer */
// for(j=0;j<m_mxcaps.cDestinations;j++){
if (DESTINATION) j=0;
else j=1;

MIXERLINE dmixerline;
dmixerline.cbStruct = sizeof(MIXERLINE);
dmixerline.dwDestination = j;
if ((err = mixerGetLineInfo((HMIXEROBJ)m_hMixer,&dmixerline, MIXER_GETLINEINFOF_DESTINATION))) {
TRACE0("Error getting destination lines\n");
}
else{
/* Get info about all the controls for this dest line */
MIXERLINECONTROLS destLineControls;
MIXERCONTROL * destControlArray = (MIXERCONTROL*)malloc(dmixerline.cControls * sizeof(MIXERCONTROL));
destLineControls.cbStruct = sizeof(MIXERLINECONTROLS);
destLineControls.cControls = dmixerline.cControls;
destLineControls.dwLineID = dmixerline.dwLineID;
destLineControls.pamxctrl = destControlArray;
destLineControls.cbmxctrl = sizeof(MIXERCONTROL);
if ((err = mixerGetLineControls((HMIXEROBJ)m_hMixer, &destLineControls, MIXER_GETLINECONTROLSF_ALL))){
TRACE0("Error getting destination line controls");
}
else{
for(l=0;l<dmixerline.cControls;l++){
if ( destControlArray[l].dwControlType==ComponentType ) {
m_strDstLineName = dmixerline.szName;
if ( MIXERCONTROL_CONTROLTYPE_VOLUME==destControlArray[l].dwControlType) {
m_dwMinimum = destControlArray[l].Bounds.dwMinimum;
m_dwMaximum = destControlArray[l].Bounds.dwMaximum;
m_dwVolumeControlID = destControlArray[l].dwControlID;
m_strVolumeControlName = destControlArray[l].szName;
return TRUE;
}
else if ( MIXERCONTROL_CONTROLTYPE_MUTE==destControlArray[l].dwControlType) {
m_strMuteControlName = destControlArray[l].szName;
m_dwMuteControlID = destControlArray[l].dwControlID;
return TRUE;
}
else if ( MIXERCONTROL_CONTROLTYPE_ONOFF==destControlArray[l].dwControlType) {
m_dwONOFFControlID = destControlArray[l].dwControlID;
return TRUE;
}
}
}
}
/* Get info about all the source lines for this dest line */
for(k=0;k<dmixerline.cConnections;k++){
MIXERLINE smixerline;
smixerline.cbStruct = sizeof(MIXERLINE);
smixerline.dwDestination = j;
smixerline.dwSource = k;
if ((err = mixerGetLineInfo((HMIXEROBJ)m_hMixer, &smixerline, MIXER_GETLINEINFOF_SOURCE))){
TRACE0("Error getting source lines\n");
}
else{
/* get info about all the controls for this source line */
MIXERLINECONTROLS sourceLineControls;
MIXERCONTROL * sourceControlArray = (MIXERCONTROL*)malloc(smixerline.cControls * sizeof(MIXERCONTROL));
sourceLineControls.cbStruct = sizeof(MIXERLINECONTROLS);
sourceLineControls.cControls = smixerline.cControls;
sourceLineControls.dwLineID = smixerline.dwLineID;
sourceLineControls.pamxctrl = sourceControlArray;
sourceLineControls.cbmxctrl = sizeof(MIXERCONTROL);
if ((err = mixerGetLineControls((HMIXEROBJ)m_hMixer, &sourceLineControls, MIXER_GETLINECONTROLSF_ALL))){
TRACE0("Error getting source line controls");
}
else{
for(l=0;l<smixerline.cControls;l++){
if ( smixerline.dwComponentType==ComponentType && sourceControlArray[l].dwControlType==ControlType) {
m_strDstLineName = smixerline.szName;
if ( MIXERCONTROL_CONTROLTYPE_VOLUME==sourceControlArray[l].dwControlType) {
m_dwMinimum = sourceControlArray[l].Bounds.dwMinimum;
m_dwMaximum = sourceControlArray[l].Bounds.dwMaximum;
m_dwVolumeControlID = sourceControlArray[l].dwControlID;
m_strVolumeControlName = sourceControlArray[l].szName;
return TRUE;
}
else if( MIXERCONTROL_CONTROLTYPE_MUTE==sourceControlArray[l].dwControlType ){
m_strMuteControlName = sourceControlArray[l].szName;
m_dwMuteControlID = sourceControlArray[l].dwControlID;
return TRUE;
}
else if ( MIXERCONTROL_CONTROLTYPE_ONOFF==sourceControlArray[l].dwControlType) {
m_dwONOFFControlID = sourceControlArray[l].dwControlID;
return TRUE;
}
}
}
}
}
}
}
// }
return FALSE;
}