Media control using GPIO pins for buttons about meta-rpi-bt-dac HOT 8 CLOSED

I think this should be doable using the org.bluez.MediaPlayer1 API (https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/doc/media-api.txt) though I have never tried it.

Currently all the media controls need to be done from the connecting device and the Pi is simply an audio sink.

The MediaPlayer1 API would need a dbus client. Something similar as the current a2dp agent (https://github.com/spietika/meta-rpi-bt-dac/blob/master/recipes-connectivity/a2dp-agent/files/agent.c)

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There is a utility called "bluetooth-player" that comes with the BlueZ source (https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/tools/bluetooth-player.c) that implements the MediaPlayer1 API. I was able to use it from command line and control Spotify when playing music from my phone (example below, also showing song info from the phone). Though, after pause/play the next did not seem to work anymore so there probably is some debugging needed.

Currently the bluetooth-player utility is not included in the image. If you like to have a go at this, I can build a new release with it included.

[bluetooth]# next
Attempting to jump to next
Next successful
[CHG] Player /org/bluez/hci0/dev_64_A2_F9_0E_D2_55/player7 Title: Reflect The Storm
[CHG] Player /org/bluez/hci0/dev_64_A2_F9_0E_D2_55/player7 Duration: 0x03ea08
[CHG] Player /org/bluez/hci0/dev_64_A2_F9_0E_D2_55/player7 Item: /org/bluez/hci0/dev_64_A2_F9_0E_D2_55/player7/NowPlaying/item1
[CHG] Player /org/bluez/hci0/dev_64_A2_F9_0E_D2_55/player7 Album: Come Clarity (Re-issue 2014)
[CHG] Player /org/bluez/hci0/dev_64_A2_F9_0E_D2_55/player7 Artist: In Flames
[CHG] Player /org/bluez/hci0/dev_64_A2_F9_0E_D2_55/player7 NumberOfTracks: 0x000000
[CHG] Player /org/bluez/hci0/dev_64_A2_F9_0E_D2_55/player7 TrackNumber: 0x000000
[CHG] Item /org/bluez/hci0/dev_64_A2_F9_0E_D2_55/player7/NowPlaying/item1 Title: Reflect The Storm
[CHG] Item /org/bluez/hci0/dev_64_A2_F9_0E_D2_55/player7/NowPlaying/item1 Duration: 0x03ea08
[CHG] Item /org/bluez/hci0/dev_64_A2_F9_0E_D2_55/player7/NowPlaying/item1 Album: Come Clarity (Re-issue 2014)
[CHG] Item /org/bluez/hci0/dev_64_A2_F9_0E_D2_55/player7/NowPlaying/item1 Artist: In Flames
[CHG] Item /org/bluez/hci0/dev_64_A2_F9_0E_D2_55/player7/NowPlaying/item1 NumberOfTracks: 0x000000
[CHG] Item /org/bluez/hci0/dev_64_A2_F9_0E_D2_55/player7/NowPlaying/item1 TrackNumber: 0x000000
[CHG] Player /org/bluez/hci0/dev_64_A2_F9_0E_D2_55/player7 Position: 0x0000a6
[bluetooth]# 

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I'll try making a gpio control script on a fresh install of raspbian. I wanted to do this for a while but I didn't know about this api so this should help

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The script I made runs on python 2.7. I included a picture that shows which pins are used for media control and I already made sure they wouldn't mess with the dac
I can't figure out how to get the MAC address to use for the dbus commands so I have to look into that more
gpio-media-control.txt

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I don't know how to set up the build environment but I just modified the existing image. You have to modify /usr/bin/gpio-media-control.py to manually put your phone mac address
https://www16.zippyshare.com/v/Grddlgd4/file.html

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Great work. What changes did you have to make to get it working? Add Python and gpio-media-control.py script and probably some init script for it? Anything else?

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I just added the script and the bare minimum to get python working (/usr/bin/python2.7, /usr/include/python2.7, and /usr/lib/python2.7). I just added the script to the init script for the a2dp service

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I built a new image with Python and GPIO library included. Moreover, I also added the bluetooth-player utility to the image.

If you have time, could you test the media control script with bluetooth-player previous, bluetooth-player next etc. commands in place of the current dbus-send. I think the player utility is able to figure out the MAC automatically so it would be quite generic.

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