readme

蓝牙通讯协议中A2DVP应用的程序

Release Notes

0.62 : server is a daemon. added service /etc/init.d script.
  added scripts to install libsbc and pybluez 
  added setup script to install
0.6 : AVRCP emulates lircd 
0.51: added realtime privs for the process


INSTALL

libsbc (http://sbc.sf.net); check for /usr/lib/libsbc.so.
  if not installed, then run install script:
  sudo ./install_libsbc

pybluez (http://org.csail.mit.edu/pybluez/)
  if not installed, then run install script:
  sudo ./install_pybluez

to install a2dp-python run:
sudo python setup.py install


USAGE:

put this in your .asoundrc file
pcm.a2dpcopy {
            type plug
            slave {
                  pcm "tee:default,'/tmp/a2dpipe', raw"
                  rate 48000
                  channels 2
             }
}

pcm.a2dp {
            type plug
            slave {
                  pcm "file:'/tmp/a2dpipe', raw"
                  rate 48000
                  channels 2
             }
}

make pipe by: mkfifo /tmp/a2dpipe
start by python a2dpd.py
stop by killing the process

select alsa output pcm device a2dpcopy
for mplayer: -ao alsa:device=a2dpcopy

In such setup the sound will be present in the alsa default device
and be copied to the headphones. The sound timing is driven by alsa,
if headphones are disconnected or out of reach the server will just
drop packets, and alsa device will notice nothing. The sound between
alsa device and the headphones is out of sync by constant delay
of about 400 ms.

To send sound just to headphones select alsa output pcm device a2dp
and set ismaster=1 close to the end of the /etc/a2dpd.conf file.

If the server uses alsa timing (i.e., ismaster==0), some dropouts
can be experienced due to (if) the timing differences
in alsa and headphones.


A2DP server works with many ACP (headphones) simultaneously if the
default link policy is set up as master, i.e., set
lm master in /etc/bluetooth/hcid.conf 

To initiate connection with the server press PLAY button on the headphones.
To stop connection just switch off the headphones.

To connect with the server for the first time, or to reconnect after the
headphones were connected with another device assign address of your
headphones to myaddr variable in /etc/a2dpd.conf file, switch on the headphones and
restart the server. 


AVRCP->lircd
enable lirc support in applications (mplayer, xmms, audacious, vlc)
append the provided sample lircrc file to your ~/.lircrc file

start by python avrcp_lircd.py
stop by killing the process.


To use start/stop script a2dpd:

start/stop service by sudo /etc/init.d/a2dpd start/stop or use your
configurational manager to add the service to boot up process.