Switch audio output in commandline of RPi
Auto
amixer cset numid=3 0
3.5mm Jack
amixer cset numid=3 1
HDMI
amixer cset numid=3 2
Play Mp3 File
mplayer music.mp3
Volume control
At first, we use amixer scontrols to show yourmixer control.
Or use alsamixer
amixer sset 'PCM' 80%
catkin_make
catkin_make
source ./devel/setup.bash
echo source $(pwd)/devel/setup.bash >> ~/.bashrc
Install ROS sound play depdence
When catkin_make done, use rosdep install sound_play
rosdep install sound_play
remake
catkin_make
Sound Play Node
In soundplay_node.launch you can set device path in linux env, for example '/dev/audio' is