讓通話中能調整聲音與麥克風的音量

調整通話中的音量可以從XX9712與XX1182來調整，由於在XX9712中更改有可能會更動到其他狀態下的設定值，且XX1182原本就可以在Runtime模式下，藉由UART傳送AT Command來達到動態調整的功能，因此由XX1182來調整，在實踐上應該會比較簡單！
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首先，必須先知道在通話模式時，調整聲音的音量是由哪個driver所控制，根據Roland的說法，通話時音量的控制是由audio_api.dll所控制，即platform\bluetooth\PCM_Audio_Control.cpp，在此程式中有四個function：SetAudioVolume、GetAudioVolume、SetAudioMicVolume及GetAudioMicVolume分別對應到speaker與microphone的音量大小，因此只要在此加入控制程式即可！

為了要能控制XX1182，所以必須在XX1182的IOControl中加入相對應的程式：

case IOCTL_FME_PCM_VOLLEVEL:
{
unsigned char FmInitStr[][7] ={
{0xFC, 0xF3, 0x3B, 0x1E,0x3D,dwLenOut,0x00},
{0xFC, 0xF3, 0x3B, 0x1E,0x3A,0x00,0x00}
};
for(i=0;i<2;i++) bresult =" WriteFile" val =" dwLenOut;" i="0;i<2;i++)" bresult =" WriteFile" val =" dwLenOut;" style="color: rgb(255, 255, 51);">PCM1SpkVol、PCM2SpkVol、PCM1MicVolPCM2MicVol用來儲存兩中模式下speaker與microphone的音量大小。

增加好控制碼後，在PCM_Audio_Control.cpp中就可以控制XX1182的輸出音量了：

DllExport void SetAudioVolume(AudioLevel audioLevel)
{
HANDLE g_hFM1182=NULL;
USHORT parm01=0;
DWORD dwRet;
g_hFM1182 = CreateFile(L"FME1:",0,0,NULL,OPEN_EXISTING,0,NULL);
if (INVALID_HANDLE_VALUE == g_hFM1182)
{
RETAILMSG(0, (TEXT("=====Error calling CreateFile on g_hFM1182\r\n")));
}
else
{
RETAILMSG(0, (TEXT("=====Calling CreateFile on g_hFM1182 Success!!\r\n")));
dwRet = DeviceIoControl(g_hFM1182,IOCTL_FME_PCM_SPKVOLLEVEL,
&parm01,sizeof(USHORT),NULL,(DWORD)audioLevel,NULL,NULL);
}
CloseHandle(g_hFM1182);
}

DllExport AudioLevel GetAudioVolume(void)
{
HKEY hkey;
LONG lResult;
DWORD dwType, dwSize;
unsigned short dvalue;
dwSize = 4;

if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, _T("SOFTWARE"), 0, KEY_QUERY_VALUE, &hkey) != ERROR_SUCCESS)
return 0;

if(PIO_READ_INPUT(GPIO, GPIO_GROUP(3),GPIO_INDEX(20)))
{
lResult = RegQueryValueEx(hkey, _T("PCM2SpkVol"), NULL, &dwType, (LPBYTE)&dvalue, &dwSize); //query registry value
}
else
{
lResult = RegQueryValueEx(hkey, _T("PCM1SpkVol"), NULL, &dwType, (LPBYTE)&dvalue, &dwSize); //query registry value
}

RegCloseKey(hkey);
return dvalue;

}

DllExport void SetAudioMicVolume(AudioLevel audioLevel)
{
HANDLE g_hFM1182=NULL;
USHORT parm01=0;
DWORD dwRet;
g_hFM1182 = CreateFile(L"FME1:",0,0,NULL,OPEN_EXISTING,0,NULL);


if (INVALID_HANDLE_VALUE == g_hFM1182)
{
RETAILMSG(0, (TEXT("=====Error calling CreateFile on g_hFM1182\r\n")));
}
else
{
RETAILMSG(0, (TEXT("=====Calling CreateFile on g_hFM1182 Success!!\r\n")));
dwRet = DeviceIoControl(g_hFM1182,IOCTL_FME_PCM_VOLLEVEL,
&parm01,sizeof(USHORT),NULL,(DWORD)audioLevel,NULL,NULL);
}
CloseHandle(g_hFM1182);
}

DllExport AudioLevel GetAudioMicVolume(void)
{
HKEY hkey;
LONG lResult;
DWORD dwType, dwSize;
unsigned short dvalue;
dwSize = 4;

if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, _T("SOFTWARE"), 0, KEY_QUERY_VALUE, &hkey) != ERROR_SUCCESS)
return 0;

if(PIO_READ_INPUT(GPIO, GPIO_GROUP(3),GPIO_INDEX(20)))
{
lResult = RegQueryValueEx(hkey, _T("PCM2MicVol"), NULL, &dwType, (LPBYTE)&dvalue, &dwSize); //query registry value
}
else
{
lResult = RegQueryValueEx(hkey, _T("PCM1MicVol"), NULL, &dwType, (LPBYTE)&dvalue, &dwSize); //query registry value
}

RegCloseKey(hkey);
return dvalue;
}

目前，通話中的音量可以動態的控制(若想讓聲音靜音，只需將gain值設為即可)，不過當通話結束後，gain值的大小會再回復為預設值，不會儲存通話時的調整值！