Raspberry Pi(數莓派)聲音輸出的設定

聲音輸出可設定為自動，耳機輸出，從HDMI輸出三種，預設為自動

pi@aborn ~ $ sudo apt-get install alsa-utilspi@aborn ~ $ sudo modprobe snd-bcm2835    #把聲音模組加入核心pi@aborn ~ $ sudo aplay /usr/share/sounds/alsa/Front_Center.wav pi@aborn /opt/vc $ sudo amixer cset numid=3 2numid=3,iface=MIXER,name='PCM Playback Route'; type=INTEGER,access=rw------,values=1,min=0,max=2,step=0: values=2pi@aborn /opt/vc $ sudo aplay /usr/share/sounds/alsa/Front_Center.wav Playing WAVE '/usr/share/sounds/alsa/Front_Center.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Monopi@aborn /opt/vc $ sudo amixer cset numid=3 numid=3,iface=MIXER,name='PCM Playback Route'; type=INTEGER,access=rw------,values=1,min=0,max=2,step=0: values=0pi@aborn /opt/vc $ sudo amixer cset numid=3 1numid=3,iface=MIXER,name='PCM Playback Route'; type=INTEGER,access=rw------,values=1,min=0,max=2,step=0: values=1

取不同的值分別代表：
0=auto(自動), 1=headphones(耳機), 2=hdmi 

我發現播放視頻的時候非常消耗cpu資源

參考：http://raspberrypi.stackexchange.com/questions/44/why-is-my-audio-sound-output-not-working