如何设置是Line-in还是Mic-in

[ggw007]

在VC程序里，怎样在线路输入Line-in和麦克风Mic-in之间进行选择？

[ggw007]

up

[ggw007]

up分哟

[ggw007]

这个问题我已经解决了
下面是代码,大家可以参考 可是要进来一个,我好结帖啊

void SelectMic()
{
// Open the mixer device
HMIXER hmx;
mixerOpen(&hmx, 0, 0, 0, 0);

// Get the line info for the wave in destination line
MIXERLINE mxl;
mxl.cbStruct = sizeof(mxl);
mxl.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_WAVEIN;
mixerGetLineInfo((HMIXEROBJ)hmx, &mxl,
MIXER_GETLINEINFOF_COMPONENTTYPE);

// Find a LIST control, if any, for the wave in line
LPMIXERCONTROL pmxctrl = (LPMIXERCONTROL)malloc(mxl.cControls * sizeof
MIXERCONTROL);
MIXERLINECONTROLS mxlctrl = {sizeof mxlctrl, mxl.dwLineID, 0,
mxl.cControls, sizeof MIXERCONTROL, pmxctrl};
mixerGetLineControls((HMIXEROBJ) hmx, &mxlctrl,
MIXER_GETLINECONTROLSF_ALL);

// Now walk through each control to find a type of LIST control. This
// can be either Mux, Single-select, Mixer or Multiple-select.
DWORD i;
for(i=0; i < mxl.cControls; i++)
if (MIXERCONTROL_CT_CLASS_LIST == (pmxctrl[i].dwControlType
&MIXERCONTROL_CT_CLASS_MASK))
break;
if (i < mxl.cControls) { // Found a LIST control
// Check if the LIST control is a Mux or Single-select type
BOOL bOneItemOnly = FALSE;
switch (pmxctrl[i].dwControlType) {
case MIXERCONTROL_CONTROLTYPE_MUX:
case MIXERCONTROL_CONTROLTYPE_SINGLESELECT:
bOneItemOnly = TRUE;
}

DWORD cChannels = mxl.cChannels, cMultipleItems = 0;
if (MIXERCONTROL_CONTROLF_UNIFORM & pmxctrl[i].fdwControl)
cChannels = 1;
if (MIXERCONTROL_CONTROLF_MULTIPLE & pmxctrl[i].fdwControl)
cMultipleItems = pmxctrl[i].cMultipleItems;

// Get the text description of each item
LPMIXERCONTROLDETAILS_LISTTEXT plisttext =
(LPMIXERCONTROLDETAILS_LISTTEXT)
malloc(cChannels * cMultipleItems * sizeof
MIXERCONTROLDETAILS_LISTTEXT);
MIXERCONTROLDETAILS mxcd = {sizeof(mxcd), pmxctrl[i].dwControlID,
cChannels,
(HWND)cMultipleItems, sizeof MIXERCONTROLDETAILS_LISTTEXT,
(LPVOID) plisttext};
mixerGetControlDetails((HMIXEROBJ)hmx, &mxcd,
MIXER_GETCONTROLDETAILSF_LISTTEXT);

// Now get the value for each item
LPMIXERCONTROLDETAILS_BOOLEAN plistbool =
(LPMIXERCONTROLDETAILS_BOOLEAN)
malloc(cChannels * cMultipleItems * sizeof
MIXERCONTROLDETAILS_BOOLEAN);
mxcd.cbDetails = sizeof MIXERCONTROLDETAILS_BOOLEAN;
mxcd.paDetails = plistbool;
mixerGetControlDetails((HMIXEROBJ)hmx, &mxcd,
MIXER_GETCONTROLDETAILSF_VALUE);

// Select the "Microphone" item
for (DWORD j=0; j<cMultipleItems; j = j + cChannels)
if (0 == strcmp(plisttext[j].szName, "Microphone"))
// Select it for both left and right channels
plistbool[j].fValue = plistbool[j+ cChannels - 1].fValue = 1;
else if (bOneItemOnly)
// Mux or Single-select allows only one item to be selected
// so clear other items as necessary
plistbool[j].fValue = plistbool[j+ cChannels - 1].fValue = 0;
// Now actually set the new values in
mixerSetControlDetails((HMIXEROBJ)hmx, &mxcd,
MIXER_GETCONTROLDETAILSF_VALUE);

free(pmxctrl);
free(plisttext);
free(plistbool);
}
else
free(pmxctrl);
mixerClose(hmx);
}

[快乐鹦鹉]

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[真糨糊]

up

[ggw007]

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