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(1)Raspberry Pi 音頻設置

 書劍閣2013 2015-05-30
Raspberry <wbr>Pi <wbr>音頻設置

安裝聲音服務
sudo apt-get install alsa-utils
加載驅動
sudo modprobe snd_bcm2835

編譯DEMO
cd /opt/vc/src/hello_pi/
./rebuild.sh

測試DEMO
cd hello_audio

3.5毫米輸出
./hello_audio.bin
HDMI輸出
./hello_audio.bin 1

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命令行播放器:
sudo apt-get install mplayer
GUI播放器:
sudo apt-get install smplayer
播放MP3
mplayer -ao alsa test.mp3

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調節(jié)音量
GUI模式
alsamixer
命令行模式
amixer
amixer sset PCM 80%

amixer --help
Usage: amixer [command]
Available options:
-h,--help       this help
-c,--card N     select the card
-D,--device N   select the device, default 'default'
-d,--debug      debug mode
-n,--nocheck    do not perform range checking
-v,--version    print version of this program
-q,--quiet      be quiet
-i,--inactive   show also inactive controls
-a,--abstract L select abstraction level (none or basic)
-s,--stdin      Read and execute commands from stdin sequentially
Available commands:
scontrols       show all mixer simple controls
scontents       show contents of all mixer simple controls (default command)
sset sID P      set contents for one mixer simple control
sget sID        get contents for one mixer simple control
controls        show all controls for given card
contents        show contents of all controls for given card
cset cID P      set control contents for one control
cget cID        get control contents for one control

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