过了一会儿我一直在这个项目上（以帮助我的朋友毕业做论文），发现在线项目做得很好（尽管处理音频的pi远远落后于pi，并且压降使其冻结是唯一的方法）要使其重启，请拔下电源线）。
这是我一直在努力的步骤，并且适用于raspberry pi 3。
1.下载所需的软件包
该项目取决于pulseaudio，因此请键入以下内容进行抓取并安装：
sudo apt-get update && sudo apt-get install bluez pulseaudio-module-bluetooth python-gobject python-gobject-2 bluez-tools udev
我宁愿先更新树莓的固件，然后再安装它们，因为我的rpi-bluetooth软件包有问题，所以我这样做：
sudo rpi-update
并使其安装并前进到下一步。
2.编辑配置并应用它
首先将pi用户名添加到组pulseaudio中，
sudo usermod -a -G lp pi
使用文本编辑器在/etc/bluetooth/audio.conf下创建新配置，并添加以下行
[General]:
Enable=Source,Sink,Media,Socket
/etc/bluetooth/main.conf使用您喜欢的文本编辑器编辑文件（我正在使用nano）。
设置蓝牙类别，将以下行修改为：
Class = 0x00041C
0x000041C 表示rpi蓝牙支持A2DP协议。
更改/etc/pulse/daemon.conf
添加/修改（不要忘记在添加代码之前彻底检查代码），然后更改
resample-method = trivial
您可以使用任何喜欢的方法，我个人可以speex-float-3作为参考，您可以看到此链接
使用以下命令启动pulseaudio服务：
pulseaudio -D
我们将使用ragusa87脚本自动将蓝牙源转换为音频接收器。首先，请通过编辑文件将新配置添加到udev init.d /etc/udev/rules.d/99-input.rules并将其添加到文件中
SUBSYSTEM="input", GROUP="input", MODE="0660"
KERNEL=="input[0-9]*", RUN+="/usr/lib/udev/bluetooth"
使用mkdir 将文件夹添加udev到/usr/lib
sudo mkdir /usr/lib/udev && cd /usr/lib/udev
并将其添加到文件蓝牙中（信用ragusa87）
#!/bin/bash
# This script is called by udev when you link a bluetooth device with your computer
# It's called to add or remove the device from pulseaudio
#
#
# Output to this file
LOGFILE="/var/log/bluetooth_dev"
# Name of the local sink in this computer
# You can get it by calling : pactl list short sinks
# AUDIOSINK="alsa_output.platform-bcm2835_AUD0.0.analog-stereo"
AUDIOSINK="alsa_output.0.analog-stereo.monitor"
# User used to execute pulseaudio, an active session must be open to avoid errors
USER="pi"
# Audio Output for raspberry-pi
# 0=auto, 1=headphones, 2=hdmi.
AUDIO_OUTPUT=1
# If on, this computer is not discovearable when an audio device is connected
# 0=off, 1=on
ENABLE_BT_DISCOVER=1
echo "For output see $LOGFILE"
## This function add the pulseaudio loopback interface from source to sink
## The source is set by the bluetooth mac address using XX_XX_XX_XX_XX_XX format.
## param: XX_XX_XX_XX_XX_XX
## return 0 on success
add_from_mac(){
if [ -z "$1" ] # zero params
then
echo "Mac not found" >> $LOGFILE
else
mac=$1 # Mac is parameter-1
# Setting source name
bluez_dev=bluez_source.$mac
echo "bluez source: $mac" >> $LOGFILE
# This script is called early, we just wait to be sure that pulseaudio discovered the device
sleep 1
# Very that the source is present
CONFIRM=`sudo -u pi pactl list short | grep $bluez_dev`
if [ ! -z "$CONFIRM" ]
then
echo "Adding the loopback interface: $bluez_dev" >> $LOGFILE
echo "sudo -u $USER pactl load-module module-loopback source=$bluez_dev sink=$AUDIOSINK rate=44100 adjust_time=0" >> $LOGFILE
# This command route audio from bluetooth source to the local sink..
# it's the main goal of this script
sudo -u $USER pactl load-module module-loopback source=$bluez_dev sink=$AUDIOSINK rate=44100 adjust_time=0 >> $LOGFILE
return $?
else
echo "Unable to find a bluetooth device compatible with pulsaudio using the following device: $bluez_dev" >> $LOGFILE
return -1
fi
fi
}
## This function set volume to maximum and choose the right output
## return 0 on success
volume_max(){
# Set the audio OUTPUT on raspberry pi
# amixer cset numid=3 <n>
# where n is 0=auto, 1=headphones, 2=hdmi.
amixer cset numid=3 $AUDIO_OUTPUT >> $LOGFILE
# Set volume level to 100 percent
amixer set Master 100% >> $LOGFILE
pacmd set-sink-volume 0 65537 >> $LOGFILE
return $?
}
## This function will detect the bluetooth mac address from input device and configure it.
## Lots of devices are seen as input devices. But Mac OS X is not detected as input
## return 0 on success
detect_mac_from_input(){
ERRORCODE=-1
echo "Detecting mac from input devices" >> $LOGFILE
for dev in $(find /sys/devices/virtual/input/ -name input*)
do
if [ -f "$dev/name" ]
then
mac=$(cat "$dev/name" | sed 's/:/_/g')
add_from_mac $mac
# Endfor if the command is successfull
ERRORCODE=$?
if [ $ERRORCODE -eq 0]; then
return 0
fi
fi
done
# Error
return $ERRORCODE
}
## This function will detect the bt mac address from dev-path and configure it.
## Devpath is set by udev on device link
## return 0 on success
detect_mac_from_devpath(){
ERRORCODE=-1
if [ ! -z "$DEVPATH" ]; then
echo "Detecting mac from DEVPATH" >> $LOGFILE
for dev in $(find /sys$DEVPATH -name address)
do
mac=$(cat "$dev" | sed 's/:/_/g')
add_from_mac $mac
# Endfor if the command is successfull
ERRORCODE=$?
if [ $ERRORCODE -eq 0]; then
return 0
fi
done
return $ERRORCODE;
else
echo "DEVPATH not set, wrong bluetooth device? " >> $LOGFILE
return -2
fi
return $ERRORCODE
}
## Detecting if an action is set
if [ -z "$ACTION" ]; then
echo "The script must be called from udev." >> $LOGFILE
exit -1;
fi
## Getting the action
ACTION=$(expr "$ACTION" : "\([a-zA-Z]\+\).*")
# Switch case
case "$ACTION" in
"add")
# Turn off bluetooth discovery before connecting existing BT device to audio
if [ $ENABLE_BT_DISCOVER -eq 1]; then
echo "Stet computer as hidden" >> $LOGFILE
hciconfig hci0 noscan
fi
# Turn volume to max
volume_max
# Detect BT Mac Address from input devices
detect_mac_from_input
OK=$?
# Detect BT Mac address from device path on a bluetooth event
if [ $OK != 0 ]; then
if [ "$SUBSYSTEM" == "bluetooth" ]; then
detect_mac_from_devpath
OK=$?
fi
fi
# Check if the add was successfull, otherwise display all available sources
if [ $OK != 0 ]; then
echo "Your bluetooth device is not detected !" >> $LOGFILE
echo "Available sources are:" >> $LOGFILE
sudo -u $USER pactl list short sources >> $LOGFILE
else
echo "Device successfully added " >> $LOGFILE
fi
;;
"remove")
# Turn on bluetooth discovery if device disconnects
if [ $ENABLE_BT_DISCOVER -eq 1]; then
echo "Set computer as visible" >> $LOGFILE
sudo hciconfig hci0 piscan
fi
echo "Removed" >> $LOGFILE
;;
#
*)
echo "Unsuported action $action" >> $LOGFILE
;;
esac
echo "--" >> $LOGFILE
请注意，您的AUDIOSINK可能与我的不同，请在使用前进行检查 pactl list short sinks
通过输入此代码使脚本可执行
chmod 777 bluetooth
插入耳机以测试音频插孔是否正常工作并进行测试
aplay /usr/share/sounds/alsa/Front_Center.wav
或者您可以通过设置默认音频路由
须藤搅拌机cset numid = 3 n
其中n可能是：0 =自动1 =插孔2 = HDMI
3.配对并连接音频
转到终端并输入bluetoothctl。首先使用激活蓝牙，power on然后使用agent on设置您之前一直在编辑的默认代理，default-agent然后使用设置可发现模式和配对模式discoverable on; pairable on。您应该在手机或笔记本电脑上看到raspberrypi蓝牙，然后单击并触摸配对即可在手机上将其配对。在终端上，键入y。返回终端，通过键入以下内容连接到电话，connect xx:xx:xx:xx:xx:xx其中xx:xx:xx:xx:xx:xx是您的电话蓝牙mac地址。并且不要忘记信任trust xx:xx:xx:xx:xx:xx where xx:xx:xx:xx:xx:xx您的电话是您的手机的蓝牙mac地址，瞧，您有使用树莓派的蓝牙放大器（或其他名称）。
4。结论
经过尝试后，我发现音频质量很差，我宁愿不使用它，因为如果您将树莓派与歌曲流传输到树莓派一起使用，它将被冻结。我建议通过使用gmediarenderer使用UPNP扬声器项目。音频很棒，没有延迟和分散的声音，并且可以播放无损音频文件（flac，wav，dll）。这是详细的设置方法
参考：
jobpassion的教程；
rag的剧本 ;
相关工作 ;