use the command :
mplayer -ac help
to list audio codec driver that the system cunrrent detected .
following is the output :
[root@(none) mnt]# mplayer -ao help 
 MPlayer 1.0rc1.atmel.2-4.2.1 (C) 2000-2006 MPlayer Team
 CPU: ARM
 Available audio output drivers:
          oss      OSS/ioctl audio output
          alsa     ALSA-0.9.x-1.x audio output
          mpegpes DVB audio output
          null     Null audio output
          pcm      RAW PCM/WAVE file writer audio output
[root@(none) mnt]# mplayer -ac help
 MPlayer 1.0rc1.atmel.2-4.2.1 (C) 2000-2006 MPlayer Team
 CPU: ARM
 Available audio codecs:
 ac:          afm:       status:    info:  [lib/dll]
 wma9dmo      dmo        working    Windows Media Audio 9 DMO  [wma9dmod.dll]
 wmadmo       dmo        working    Windows Media Audio DMO  [wmadmod.dll]
 wma9spdmo    dmo        working    Windows Media Audio 9 Speech DMO  [wmspdmod.dll]
 wma9spdshow dshow      problems  Windows Media Audio 9 Speech DShow  [wmavds32.ax]
 ffqdm2       ffmpeg     working    FFmpeg QDM2 audio decoder  [qdm2]
 qdmc         qtaudio    working    QuickTime QDMC/QDM2 audio decoders  [QuickTime.qts]
 qclp         qtaudio    working    QuickTime QCLP audio decoder  [QuickTime.qts]
 qtmace3      qtaudio    working    QuickTime MACE3 audio decoder  [QuickTime.qts]
 qtmace6      qtaudio    working    QuickTime MACE6 audio decoder  [QuickTime.qts]
 ffra144      ffmpeg     working    FFmpeg RealAudio 1.0  [real_144]
 ffra288      ffmpeg     working    FFmpeg RealAudio 2.0  [real_288]
 ffcook       ffmpeg     working    FFmpeg COOK audio decoder  [cook]
 ra144        realaud    working    RealAudio 1.0  [14_4.so.6.0]
 ra144win     realaud    working    Win32 RealAudio 1.0  [14_43260.dll]
 ra144mac     realaud    working    Mac OS X RealAudio 1.0  [14_4.shlb]
 ra288        realaud    working    RealAudio 2.0  [28_8.so.6.0]
 ra288win     realaud    working    Win32 RealAudio 2.0  [28_83260.dll]
 ra288mac     realaud    working    Mac OS X RealAudio 2.0  [28_8.shlb]
 ra10cook     realaud    working    RealPlayer 10 COOK audio  [cook.so]
 racook       realaud    working    RealAudio COOK  [cook.so.6.0]
 racookwin    realaud    working    Win32 RealAudio COOK  [cook3260.dll]
 racookmac    realaud    working    Mac OS X RealAudio COOK  [cook.bundle/Contents/MacOS/cook]
 rasipr       realaud    working    RealAudio Sipro  [sipr.so.6.0]
 ra10sipr     realaud    working    RealPlayer 10 RealAudio Sipro  [sipr.so]
 rasiprwin    realaud    working    Win32 RealAudio Sipro  [sipr3260.dll]
 rasiprmac    realaud    working    Mac OS X RealAudio Sipro  [sipr.bundle/Contents/MacOS/sipr]
 raatrc       realaud    working    RealAudio ATRAC3  [atrc.so.6.0]
 ra10atrc     realaud    working    RealPlayer 10 RealAudio ATRAC3  [atrc.so]
 raatrcwin    realaud    working    Win32 RealAudio ATRAC3  [atrc3260.dll]
 raatrcmac    realaud    working    Mac OS X RealAudio ATRAC3  [atrc.bundle/Contents/MacOS/atrc]
 imaadpcm     imaadpcm  working    IMA ADPCM
 msadpcm      msadpcm    working    MS ADPCM
 dk4adpcm     imaadpcm  working    Duck DK4 ADPCM (rogue format number)
 dk3adpcm     dk3adpcm  working    Duck DK3 ADPCM (rogue format number)
 ffroqaudio  ffmpeg     working    Id RoQ File Audio Decoder  [roq_dpcm]
 ffsmkaud     ffmpeg     problems  FFmpeg Smacker Audio  [smackaud]
 libdv        libdv      working    raw DV audio decoder (libdv)  [libdv.so.2]
 ffdv         ffmpeg     working    FFmpeg DV audio decoder  [dvaudio]
 faad         faad       working    FAAD AAC (MPEG-2/MPEG-4 Audio) decoder  [libfaad2]
 ffflac       ffmpeg     working    FFmpeg FLAC audio decoder  [flac]
 ffalac       ffmpeg     working    FFmpeg ALAC audio decoder  [alac]
 fftta        ffmpeg     working    FFmpeg True Audio (TTA) decoder  [tta]
 ffwavpack    ffmpeg     working    FFmpeg WavPack audio decoder  [wavpack]
 ffshorten    ffmpeg     working    FFmpeg Shorten audio decoder  [shorten]
 pcm          pcm        working    Uncompressed PCM
 divx         acm        working    DivX audio (WMA)  [divxa32.acm]
 msadpcmacm  acm        working    MS ADPCM  [msadp32.acm]
 mp3          mp3lib     working    mp3lib MPEG layer-2, layer-3
 ffpcmdaud    ffmpeg     untested  D-Cinema audio (FFmpeg)  [pcm_s24daud]
 ffwmav1      ffmpeg     untested  DivX audio v1 (FFmpeg)  [wmav1]
 ffwmav2      ffmpeg     untested  DivX audio v2 (FFmpeg)  [wmav2]
 ffmac3       ffmpeg     untested  Macintosh Audio Compression and Expansion 3:1  [mace3]
 ffmac6       ffmpeg     untested  Macintosh Audio Compression and Expansion 6:1  [mace6]
 ffsonic      ffmpeg     untested  FFmpeg Sonic  [sonic]
 ffmp3on4     ffmpeg     working    FFmpeg Multi-channel MPEG layer-3 on MP4 audio decoder  [mp3on4]
 ffmp3        ffmpeg     working    FFmpeg MPEG layer-3 audio decoder  [mp3]
 ffmp3adu     ffmpeg     working    FFmpeg MPEG layer-3 adu audio decoder  [mp3adu]
 ffmp2        ffmpeg     working    FFmpeg MPEG layer-1 and layer-2 audio decoder  [mp2]
 mad          libmad     working    libMAD MPEG layer 1-2-3  [libmad]
 mp3acm       acm        working    MPEG layer-3  [l3codeca.acm]
 imaadpcmacm acm        working    IMA ADPCM  [imaadp32.acm]
 msgsm        msgsm      working    MS GSM
 msgsmacm     acm        working    MS GSM  [msgsm32.acm]
 msnaudio     acm        working    MSN AUDIO  [msnaudio.acm]
 alaw         alaw       working    aLaw
 ulaw         alaw       working    uLaw
 dvdpcm       dvdpcm     working    Uncompressed DVD/VOB LPCM
 a52          liba52     working    AC3-liba52  [liba52]
 ac3          libac3     working    AC3-libac3  [libac3]
 ffdts        ffmpeg     working    DTS  [dts]
 musepack     mpcdec     working    Musepack audio codec
 ffamrnb      ffmpeg     working    AMR Narrowband  [amr_nb]
 ffamrwb      ffmpeg     working    AMR Wideband  [amr_wb]
 ffadcpmswf  ffmpeg     working    FFmpeg’s ADPCM Flash-variant  [adpcm_swf]
 voxware      dshow      working    VoxWare  [voxmsdec.ax]
 acelp        dshow      working    ACELP.net Sipro Lab Audio Decoder  [acelpdec.ax]
 imc          acm        working    Intel Music Coder  [imc32.acm]
 iac25        acm        working    Indeo audio  [iac25_32.ax]
 ffctadp32    ffmpeg     working    Creative ADPCM native codec  [adpcm_ct]
 ctadp32      acm        working    Creative ADPCM codec  [ctadp32.acm]
 sc4          acm        working    SC4 : Micronas speech codec (ADPCM, MPman recording)  [mi-sc4.acm]
 hwac3        hwac3      working    AC3 through S/PDIF
 hwdts        hwac3      working    DTS through S/PDIF
 ffvorbis     ffmpeg     working    FFmpeg Vorbis decoder  [vorbis]
 vorbis       libvorbis working    OggVorbis Audio Decoder  [libvorbis]
 speex        speex      working    Speex Audio Decoder  [speex]
 vivoaudio    acm        working    Vivo G.723/Siren Audio Codec  [vivog723.acm]
 g72x         g72x       crashing  G.711/G.721/G.723  [g72x.c]
 ffg726       ffmpeg     working    Sharp G.726 Audio  [g726]
 g726         acm        untested  Sharp G.726 Audio  [scg726.acm]
 atrac3       acm        problems  Sony ATRAC3  [atrac3.acm]
 ALF2         acm        working    ALF2  [alf2cd.acm]
 fftruespeech ffmpeg     working    FFmpeg TrueSpeech  [truespeech]
 truespeech  acm        working    DSP Group TrueSpeech(TM)  [tssoft32.acm]
 voxwarert24 acm        working    VoxWare RT24 speech codec  [nsrt2432.acm]
 lhacm        acm        working    Lernout & Hauspie CELP and SBC codecs  [lhacm.acm]
 TwinVQ       vqf        working    VQF codec by NTTLabs  [tvqdec.dll]
 hwmpa        hwmpa      working    MPEG audio pass-through for hardware MPEG decoders
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