一般正常的录音都是对Line in进行录音,但有些需要对line out进行录音,因为有些音源是没有line in的.
如即时聊天时录取对方的语音.但这些声音都要经过声卡播放,所以它们的音源就是声卡输出.
对于声卡的输出,在录音控制中有两个,就是Mono mix和stereo mix,当然最好是选取stereo mix,效果更好.
编程打开录音设备时,是不能控制打开的设备上的输出还是输入通道的.所在要在打开设备前就设置好.
用Mixer的API可以对输出源进行牧举,不过不同的设备的定义不同,对于SoundMax能够正确区别stereo mix和Mono mix的区别,但AC 97的声卡它都是相似的输出源.所以只能多次地优选列举.代码逻辑不是完美,但只能如此.否则只能让用户手工选择,致少要按6次mouse才行.
以下是自己定义的结构,在第一次没有找到正确的输出源时将所有输出源保的index,swLineID和name保存起来.下面
在结构数组中再优选,而不要再对设备牧举
typedef struct ControlEnumData{
INT index;
CString szName;
DWORD dwLineID;
} CTRL_ENUM_DATA,* LPCTRL_ENUM_DATA;
BOOLXXX::setOutSource()
{
UINTdeviceCount
=
::mixerGetNumDevs();
if
(deviceCount
<
1
){
MessageBox(
"
没有找到混音设备,请手工选择录音设备的混音输出!
"
);
return
TRUE;
}
BOOLfound
=
FALSE;
for
(UINTdevID
=
0
;devID
<
deviceCount;devID
++
){
HMIXERhMixer;
if
(mixerOpen(
&
hMixer,devID,(DWORD)
0
,
0
,CALLBACK_WINDOW)
!=
MMSYSERR_NOERROR)
{
::mixerClose(hMixer);
continue
;
}
MIXERLINEline;
line.cbStruct
=
sizeof
(MIXERLINE);
//
注意我们要查找的是录音设备.所以dwComponentType应该是MIXERLINE_COMPONENTTYPE_DST_WAVEIN;
line.dwComponentType
=
MIXERLINE_COMPONENTTYPE_DST_WAVEIN;
if
(::mixerGetLineInfo((HMIXEROBJ)hMixer,
&
line,
MIXER_OBJECTF_HMIXER
|
MIXER_GETLINEINFOF_COMPONENTTYPE)
!=
MMSYSERR_NOERROR){
::mixerClose(hMixer);
continue
;
}
DWORDdwConnections
=
line.cConnections;
DWORDselectIndex
=
-
1
;
MIXERLINElinesub;
CTRL_ENUM_DATAenumData[
8
];
int
enumIndex
=
0
;
//
然后看录音设备上共一连结了几个线路
for
(DWORDi
=
0
;i
<
dwConnections;i
++
){
//
列举出波形混音输出源的索引并最声音设置最大
linesub.cbStruct
=
sizeof
(MIXERLINE);
linesub.dwSource
=
i;
linesub.dwDestination
=
line.dwDestination;
if
(mixerGetLineInfo((HMIXEROBJ)hMixer,
&
linesub,
MIXER_OBJECTF_HMIXER
|
MIXER_GETLINEINFOF_SOURCE)
==
MMSYSERR_NOERROR){
if
(linesub.dwComponentType
==
MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT){
//
这是stereomix的输出源.如果能明确找到,就直接定位到这个index上.
//
并把这个设备选中并把音量调到最大.
MIXERCONTROLmxc;
MIXERLINECONTROLSmxlc;
mxlc.cbStruct
=
sizeof
(MIXERLINECONTROLS);
mxlc.dwLineID
=
linesub.dwLineID;
DWORDdwControlType
=
MIXERCONTROL_CONTROLTYPE_VOLUME;
mxlc.dwControlType
=
dwControlType;
mxlc.cControls
=
1
;
mxlc.cbmxctrl
=
sizeof
(MIXERCONTROL);
mxlc.pamxctrl
=
&
mxc;
if
(::mixerGetLineControls((HMIXEROBJ)hMixer,
&
mxlc,
MIXER_OBJECTF_HMIXER
|
MIXER_GETLINECONTROLSF_ONEBYTYPE)
==
MMSYSERR_NOERROR)
{
MIXERCONTROLDETAILS_BOOLEANvumVal[
1
];
MIXERCONTROLDETAILSmxcd;
mxcd.cbStruct
=
sizeof
(MIXERCONTROLDETAILS);
mxcd.dwControlID
=
mxc.dwControlID;
//
在上面的&mxc得到
mxcd.cChannels
=
1
;
mxcd.cMultipleItems
=
mxc.cMultipleItems;
mxcd.cbDetails
=
sizeof
(MIXERCONTROLDETAILS_BOOLEAN);
mxcd.paDetails
=
&
vumVal;
vumVal[
0
].fValue
=
65535
;
//
将设备音量调至最大
::mixerSetControlDetails((HMIXEROBJ)hMixer,
&
mxcd,
MIXER_OBJECTF_HMIXER
|
MIXER_GETCONTROLDETAILSF_VALUE);
}
selectIndex
=
i;
break
;
//
如果明确找到MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT,break出去
}
if
(linesub.dwComponentType
==
MIXERLINE_COMPONENTTYPE_SRC_ANALOG){
//
否则是MIXERLINE_COMPONENTTYPE_SRC_ANALOG的话,保存起来
enumData[enumIndex].index
=
i;
enumData[enumIndex].dwLineID
=
linesub.dwLineID;
enumData[enumIndex
++
].szName
=
linesub.szName;
}
}
}
if
(selectIndex
==
-
1
&&
enumIndex
<
1
){
::mixerClose(hMixer);
continue
;
}
//
既没有找到MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT,也没有找到MIXERLINE_COMPONENTTYPE_SRC_ANALOG.
DWORDvumLineID;
//
这个ID用于下面对找到的输出源调整音量
if
(selectIndex
==
-
1
){
//
第一次优选,找STEREO
for
(INTi
=
0
;i
<
enumIndex;i
++
){
if
(enumData[i].szName.MakeUpper().Find(
"
STEREO
"
)
!=
-
1
)
{
selectIndex
=
enumData[i].index;
vumLineID
=
enumData[i].dwLineID;
break
;
}
}
}
if
(selectIndex
==
-
1
){
//
第二次优选,找MONO
for
(INTi
=
0
;i
<
enumIndex;i
++
){
if
(enumData[i].szName.MakeUpper().Find(
"
MONO
"
)
!=
-
1
)
{
selectIndex
=
enumData[i].index;
vumLineID
=
enumData[i].dwLineID;
break
;
}
}
}
if
(selectIndex
==
-
1
){
//
都没有就默认第一个吧.无奈:(
selectIndex
=
enumData[
0
].index;
vumLineID
=
enumData[
0
].dwLineID;
}
if
(selectIndex
!=
-
1
){
//
此时肯selectIndex肯定不为-1,加了条件是想在{}内重新定义mxc,mxlc
//
来设置音量,不和下面的设置选中的mxc,mxlc冲突.
MIXERCONTROLmxc;
MIXERLINECONTROLSmxlc;
mxlc.cbStruct
=
sizeof
(MIXERLINECONTROLS);
mxlc.dwLineID
=
vumLineID;
DWORDdwControlType
=
MIXERCONTROL_CONTROLTYPE_VOLUME;
mxlc.dwControlType
=
dwControlType;
mxlc.cControls
=
1
;
mxlc.cbmxctrl
=
sizeof
(MIXERCONTROL);
mxlc.pamxctrl
=
&
mxc;
if
(::mixerGetLineControls((HMIXEROBJ)hMixer,
&
mxlc,
MIXER_OBJECTF_HMIXER
|
MIXER_GETLINECONTROLSF_ONEBYTYPE)
==
MMSYSERR_NOERROR)
{
MIXERCONTROLDETAILS_BOOLEANvumVal[
1
];
MIXERCONTROLDETAILSmxcd;
mxcd.cbStruct
=
sizeof
(MIXERCONTROLDETAILS);
mxcd.dwControlID
=
mxc.dwControlID;
mxcd.cChannels
=
1
;
mxcd.cMultipleItems
=
mxc.cMultipleItems;
mxcd.cbDetails
=
sizeof
(MIXERCONTROLDETAILS_BOOLEAN);
mxcd.paDetails
=
&
vumVal;
vumVal[
0
].fValue
=
65535
;
//
将设备音量调至最大
::mixerSetControlDetails((HMIXEROBJ)hMixer,
&
mxcd,
MIXER_OBJECTF_HMIXER
|
MIXER_GETCONTROLDETAILSF_VALUE);
}
}
//
得到了index就能正确定位该输出源并将其选中,这里调试的时候浪费了很多时间,网上的代码
//
都是错误的.录音通道列表和控制面板中录音属性中顺序是一致的,但是对其选中的控件的顺序
//
是反的.这一点我调试了好久才发现,没有找到相关文档.KAO,网上可以看到的文章都是错误的.
found
=
TRUE;
MIXERCONTROLmxc;
MIXERLINECONTROLSmxlc;
mxlc.cbStruct
=
sizeof
(MIXERLINECONTROLS);
mxlc.dwLineID
=
line.dwLineID;
//
注意不能在linesub中查找MIXERCONTROL_CONTROLTYPE_MUX,因为"选中"互斥控件是整个录音控制的
//
即MIXERLINE_COMPONENTTYPE_DST_WAVEIN,不是波形混音输出源所独有的.
DWORDdwControlType
=
MIXERCONTROL_CONTROLTYPE_MUX;
mxlc.dwControlType
=
dwControlType;
mxlc.cControls
=
1
;
mxlc.cbmxctrl
=
sizeof
(MIXERCONTROL);
mxlc.pamxctrl
=
&
mxc;
if
(::mixerGetLineControls((HMIXEROBJ)hMixer,
&
mxlc,
MIXER_OBJECTF_HMIXER
|
MIXER_GETLINECONTROLSF_ONEBYTYPE)
!=
MMSYSERR_NOERROR)
{
MessageBox(
"
无法选中波形混音输出,请从控制面板中手工设置混音输出为录音设备!
"
);
return
FALSE;
}
MIXERCONTROLDETAILS_BOOLEANvumVal[
8
];
MIXERCONTROLDETAILSmxcd;
mxcd.cbStruct
=
sizeof
(MIXERCONTROLDETAILS);
mxcd.dwControlID
=
mxc.dwControlID;
mxcd.cChannels
=
1
;
mxcd.cMultipleItems
=
mxc.cMultipleItems;
mxcd.cbDetails
=
sizeof
(MIXERCONTROLDETAILS_BOOLEAN);
mxcd.paDetails
=&
vumVal;
if
(::mixerGetControlDetails((HMIXEROBJ)hMixer,
&
mxcd,
MIXER_OBJECTF_HMIXER
|
MIXER_GETCONTROLDETAILSF_VALUE)
!=
MMSYSERR_NOERROR)
{
MessageBox(
"
无法选中波形混音输出,请从控制面板中手工设置混音输出为录音设备!
"
);
return
FALSE;
}
for
(DWORDi
=
0
;i
<
mxc.cMultipleItems;i
++
){
vumVal[i].fValue
=
FALSE;
}
vumVal[mxc.cMultipleItems
-
selectIndex
-
1
].fValue
=
TRUE;
//
选中控件顺序和设备顺序相反,TMD
if
(::mixerSetControlDetails((HMIXEROBJ)hMixer,
&
mxcd,
MIXER_OBJECTF_HMIXER
|
MIXER_GETCONTROLDETAILSF_VALUE)
!=
MMSYSERR_NOERROR)
{
MessageBox(
"
无法选中波形混音输出,请从控制面板中手工设置混音输出为录音设备!
"
);
return
FALSE;
}
::mixerClose(hMixer);
break
;
//
如果到这里已经正确设置了,break出去.
}
if
(
!
found){
MessageBox(
"
没有找到录音设备的混音输出,请手工选择!
"
);
}
return
TRUE;
}
另外,因为混音输出是各种声音的在声卡的输出,所以在录音前最好把所有输入源设为禁音,这样可以保证质量.
并将其它的输出源的音量设为最小(这个是否有影响没有测试)
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