WinAPI: waveOutGetDevCaps - 查询输出设备的性能//声明:
waveOutGetDevCaps(uDeviceID: UINT;        {输出设备ID}lpCaps: PWaveOutCaps;   {TWaveOutCaps 结构的指针, 用于接受设备信息}uSize: UINT): MMRESULT; {TWaveOutCaps 结构大小}
): MMRESULT;              {成功返回 0; 可能的错误值见下:}MMSYSERR_BADDEVICEID = 2; {设备ID超界}
MMSYSERR_NODRIVER    = 6; {没有安装驱动程序}//TWaveOutCaps 是 tagWAVEOUTCAPSA 结构的重定义:
tagWAVEOUTCAPSA = recordwMid: Word;                                   {制造商ID}wPid: Word;                                   {产品ID}vDriverVersion: MMVERSION;                    {版本号; 高字节是主版本号, 低字节是次版本号}szPname: array[0..MAXPNAMELEN-1] of AnsiChar; {产品名称}dwFormats: DWORD;                             {支持的格式}wChannels: Word;                              {单声道(1)还是立体声(2)}dwSupport: DWORD;                             {其他功能}
end;//dwFormats:
WAVE_INVALIDFORMAT = $00000000; {invalid format}
WAVE_FORMAT_1M08   = $00000001; {11.025 kHz, Mono,   8-bit }
WAVE_FORMAT_1S08   = $00000002; {11.025 kHz, Stereo, 8-bit }
WAVE_FORMAT_1M16   = $00000004; {11.025 kHz, Mono,   16-bit}
WAVE_FORMAT_1S16   = $00000008; {11.025 kHz, Stereo, 16-bit}
WAVE_FORMAT_2M08   = $00000010; {22.05  kHz, Mono,   8-bit }
WAVE_FORMAT_2S08   = $00000020; {22.05  kHz, Stereo, 8-bit }
WAVE_FORMAT_2M16   = $00000040; {22.05  kHz, Mono,   16-bit}
WAVE_FORMAT_2S16   = $00000080; {22.05  kHz, Stereo, 16-bit}
WAVE_FORMAT_4M08   = $00000100; {44.1   kHz, Mono,   8-bit }
WAVE_FORMAT_4S08   = $00000200; {44.1   kHz, Stereo, 8-bit }
WAVE_FORMAT_4M16   = $00000400; {44.1   kHz, Mono,   16-bit}
WAVE_FORMAT_4S16   = $00000800; {44.1   kHz, Stereo, 16-bit}//dwSupport:
WAVECAPS_PITCH          = $0001; {支持音调控制}
WAVECAPS_PLAYBACKRATE   = $0002; {支持播放速度控制}
WAVECAPS_VOLUME         = $0004; {支持音量控制}
WAVECAPS_LRVOLUME       = $0008; {支持左右声道音量控制}
WAVECAPS_SYNC           = $0010; {}
WAVECAPS_SAMPLEACCURATE = $0020; {}
WAVECAPS_DIRECTSOUND    = $0040; {}

//举例:
http://www.cnblogs.com/del/archive/2008/02/20/1075508.html