Code:
void UnMute()
{
// 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);
// Now find the microphone source line connected to this wave in
// destination
DWORD cConnections = mxl.cConnections;
for(DWORD j=0; j<cConnections; j++){
mxl.dwSource = j;
mixerGetLineInfo((HMIXEROBJ)hmx, &mxl, MIXER_GETLINEINFOF_SOURCE);
if (MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE == mxl.dwComponentType)
break;
}
// Find a mute control, if any, of the microphone line
LPMIXERCONTROL pmxctrl = (LPMIXERCONTROL)malloc(sizeof MIXERCONTROL);
MIXERLINECONTROLS mxlctrl = {sizeof mxlctrl, mxl.dwLineID,
MIXERCONTROL_CONTROLTYPE_MUTE, 1, sizeof MIXERCONTROL, pmxctrl};
if(!mixerGetLineControls((HMIXEROBJ) hmx, &mxlctrl,
MIXER_GETLINECONTROLSF_ONEBYTYPE)){
// Found, so proceed
DWORD cChannels = mxl.cChannels;
if (MIXERCONTROL_CONTROLF_UNIFORM & pmxctrl->fdwControl)
cChannels = 1;
LPMIXERCONTROLDETAILS_BOOLEAN pbool =
(LPMIXERCONTROLDETAILS_BOOLEAN) malloc(cChannels * sizeof
MIXERCONTROLDETAILS_BOOLEAN);
MIXERCONTROLDETAILS mxcd = {sizeof(mxcd), pmxctrl->dwControlID,
cChannels, (HWND)0,
sizeof MIXERCONTROLDETAILS_BOOLEAN, (LPVOID) pbool};
mixerGetControlDetails((HMIXEROBJ)hmx, &mxcd,
MIXER_SETCONTROLDETAILSF_VALUE);
// Unmute the microphone line (for both channels)
pbool[0].fValue = pbool[cChannels - 1].fValue = 0;
mixerSetControlDetails((HMIXEROBJ)hmx, &mxcd,
MIXER_SETCONTROLDETAILSF_VALUE);
free(pmxctrl);
free(pbool);
}
else
free(pmxctrl);
mixerClose(hmx);
}
void SetVolume()
{
// 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);
// Now find the microphone source line connected to this wave in
// destination
DWORD cConnections = mxl.cConnections;
for(DWORD j=0; j<cConnections; j++){
mxl.dwSource = j;
mixerGetLineInfo((HMIXEROBJ)hmx, &mxl, MIXER_GETLINEINFOF_SOURCE);
if (MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE == mxl.dwComponentType)
break;
}
// Find a volume control, if any, of the microphone line
LPMIXERCONTROL pmxctrl = (LPMIXERCONTROL)malloc(sizeof MIXERCONTROL);
MIXERLINECONTROLS mxlctrl = {sizeof mxlctrl, mxl.dwLineID,
MIXERCONTROL_CONTROLTYPE_VOLUME, 1, sizeof MIXERCONTROL, pmxctrl};
if(!mixerGetLineControls((HMIXEROBJ) hmx, &mxlctrl,
MIXER_GETLINECONTROLSF_ONEBYTYPE)){
// Found!
DWORD cChannels = mxl.cChannels;
if (MIXERCONTROL_CONTROLF_UNIFORM & pmxctrl->fdwControl)
cChannels = 1;
LPMIXERCONTROLDETAILS_UNSIGNED pUnsigned =
(LPMIXERCONTROLDETAILS_UNSIGNED)
malloc(cChannels * sizeof MIXERCONTROLDETAILS_UNSIGNED);
MIXERCONTROLDETAILS mxcd = {sizeof(mxcd), pmxctrl->dwControlID,
cChannels, (HWND)0,
sizeof MIXERCONTROLDETAILS_UNSIGNED, (LPVOID) pUnsigned};
mixerGetControlDetails((HMIXEROBJ)hmx, &mxcd,
MIXER_SETCONTROLDETAILSF_VALUE);
// Set the volume to the middle (for both channels as needed)
pUnsigned[0].dwValue = pUnsigned[cChannels - 1].dwValue =
(pmxctrl->Bounds.dwMinimum+pmxctrl->Bounds.dwMaximum)/2;
mixerSetControlDetails((HMIXEROBJ)hmx, &mxcd,
MIXER_SETCONTROLDETAILSF_VALUE);
free(pmxctrl);
free(pUnsigned);
}
else
free(pmxctrl);
mixerClose(hmx);
}
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 des*****ion 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);
}