172 lines
7.2 KiB
C
172 lines
7.2 KiB
C
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#include <windows.h>
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#define MMNOMCI
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#include "mmsystem.h"
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#define NOMCIDEV
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#include "mmddk.h"
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#include "mmsysi.h"
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/* -------------------------------------------------------------------------
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** External globals
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** -------------------------------------------------------------------------
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*/
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extern DWORD mmwow32Lib;
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extern LPSOUNDDEVMSGPROC aux32Message;
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/*****************************************************************************
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* @doc EXTERNAL AUX
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*
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* @api UINT | auxGetNumDevs | This function retrieves the number of auxiliary
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* output devices present in the system.
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*
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* @rdesc Returns the number of auxiliary output devices present in the system.
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*
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* @xref auxGetDevCaps
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****************************************************************************/
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UINT WINAPI auxGetNumDevs(void)
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{
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return (UINT)auxOutMessage( 0, AUXDM_GETNUMDEVS, 0L, 0L );
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}
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/*****************************************************************************
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* @doc EXTERNAL AUX
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*
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* @api UINT | auxGetDevCaps | This function queries a specified
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* auxiliary output device to determine its capabilities.
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*
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* @parm UINT | wDeviceID | Identifies the auxiliary output device to be
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* queried. Specify a valid device ID (see the following comments
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* section), or use the following constant:
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* @flag AUX_MAPPER | Auxiliary audio mapper. The function will
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* return an error if no auxiliary audio mapper is installed.
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*
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* @parm LPAUXCAPS | lpCaps | Specifies a far pointer to an AUXCAPS
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* structure. This structure is filled with information about the
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* capabilities of the device.
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*
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* @parm UINT | wSize | Specifies the size of the AUXCAPS structure.
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*
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* @rdesc Returns zero if the function was successful. Otherwise, it returns
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* an error number. Possible error returns are:
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* @flag MMSYSERR_BADDEVICEID | Specified device ID is out of range.
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* @flag MMSYSERR_NODRIVER | The driver failed to install.
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*
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* @comm The device ID specified by <p wDeviceID> varies from zero
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* to one less than the number of devices present. AUX_MAPPER may
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* also be used. Use <f auxGetNumDevs> to determine the number of
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* auxiliary devices present in the system.
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*
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* @xref auxGetNumDevs
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****************************************************************************/
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UINT WINAPI auxGetDevCaps(UINT wDeviceID, LPAUXCAPS lpCaps, UINT wSize)
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{
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if (!wSize)
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return MMSYSERR_NOERROR;
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V_WPOINTER(lpCaps, wSize, MMSYSERR_INVALPARAM);
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return (UINT)auxOutMessage(wDeviceID, AUXDM_GETDEVCAPS, (DWORD)lpCaps, (DWORD)wSize);
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}
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/*****************************************************************************
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* @doc EXTERNAL AUX
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*
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* @api UINT | auxGetVolume | This function returns the current volume
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* setting of an auxiliary output device.
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*
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* @parm UINT | wDeviceID | Identifies the auxiliary output device to be
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* queried.
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*
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* @parm LPDWORD | lpdwVolume | Specifies a far pointer to a location
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* to be filled with the current volume setting. The low-order word of
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* this location contains the left channel volume setting, and the high-order
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* word contains the right channel setting. A value of 0xFFFF represents
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* full volume, and a value of 0x0000 is silence.
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*
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* If a device does not support both left and right volume
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* control, the low-order word of the specified location contains
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* the volume level.
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*
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* The full 16-bit setting(s)
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* set with <f auxSetVolume> are returned, regardless of whether
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* the device supports the full 16 bits of volume level control.
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*
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* @comm Not all devices support volume control.
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* To determine whether the device supports volume control, use the
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* AUXCAPS_VOLUME flag to test the <e AUXCAPS.dwSupport> field of the
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* <t AUXCAPS> structure (filled by <f auxGetDevCaps>).
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*
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* To determine whether the device supports volume control on both the
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* left and right channels, use the AUXCAPS_LRVOLUME flag to test the
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* <e AUXCAPS.dwSupport> field of the <t AUXCAPS> structure (filled
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* by <f auxGetDevCaps>).
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*
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* @rdesc Returns zero if the function was successful. Otherwise, it returns
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* an error number. Possible error returns are:
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* @flag MMSYSERR_BADDEVICEID | Specified device ID is out of range.
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* @flag MMSYSERR_NODRIVER | The driver failed to install.
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*
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* @xref auxSetVolume
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****************************************************************************/
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UINT WINAPI auxGetVolume(UINT wDeviceID, LPDWORD lpdwVolume)
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{
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V_WPOINTER(lpdwVolume, sizeof(DWORD), MMSYSERR_INVALPARAM);
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return (UINT)auxOutMessage(wDeviceID, AUXDM_GETVOLUME, (DWORD)lpdwVolume, 0);
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}
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/*****************************************************************************
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* @doc EXTERNAL AUX
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*
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* @api UINT | auxSetVolume | This function sets the volume in an
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* auxiliary output device.
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*
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* @parm UINT | wDeviceID | Identifies the auxiliary output device to be
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* queried. Device IDs are determined implicitly from the number of
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* devices present in the system. Device ID values range from zero
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* to one less than the number of devices present. Use <f auxGetNumDevs>
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* to determine the number of auxiliary devices in the system.
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*
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* @parm DWORD | dwVolume | Specifies the new volume setting. The
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* low-order word specifies the left channel volume setting, and the
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* high-order word specifies the right channel setting.
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* A value of 0xFFFF represents full volume, and a value of 0x0000
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* is silence.
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*
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* If a device does not support both left and right volume
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* control, the low-order word of <p dwVolume> specifies the volume
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* level, and the high-order word is ignored.
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*
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* @rdesc Returns zero if the function was successful. Otherwise, it returns
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* an error number. Possible error returns are:
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* @flag MMSYSERR_BADDEVICEID | Specified device ID is out of range.
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* @flag MMSYSERR_NODRIVER | The driver failed to install.
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*
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* @comm Not all devices support volume control.
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* To determine whether the device supports volume control, use the
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* AUXCAPS_VOLUME flag to test the <e AUXCAPS.dwSupport> field of the
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* <t AUXCAPS> structure (filled by <f auxGetDevCaps>).
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*
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* To determine whether the device supports volume control on both the
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* left and right channels, use the AUXCAPS_LRVOLUME flag to test the
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* <e AUXCAPS.dwSupport> field of the <t AUXCAPS> structure (filled
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* by <f auxGetDevCaps>).
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*
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* Most devices do not support the full 16 bits of volume level control
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* and will use only the high-order bits of the requested volume setting.
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* For example, for a device that supports 4 bits of volume control,
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* requested volume level values of 0x4000, 0x4fff, and 0x43be will
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* all produce the same physical volume setting, 0x4000. The
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* <f auxGetVolume> function will return the full 16-bit setting set
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* with <f auxSetVolume>.
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*
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* Volume settings are interpreted logarithmically. This means the
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* perceived volume increase is the same when increasing the
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* volume level from 0x5000 to 0x6000 as it is from 0x4000 to 0x5000.
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*
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* @xref auxGetVolume
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****************************************************************************/
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UINT WINAPI auxSetVolume(UINT wDeviceID, DWORD dwVolume)
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{
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return (UINT)auxOutMessage(wDeviceID, AUXDM_SETVOLUME, dwVolume, 0);
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}
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