Very minimal car player for Raspberry Pi

1. Minimal set of controls: GPIO buttons to choose genre of song, plus optional pause button

2. popular_mode constant in settings.h selects one of the following modes:

• 0: Random
• 1: The more often the user listens to the song, the more often it is played

3. order_instead_of_shuffle constant selects a submode of popular_mode=0:

• 0: Shuffle
• 1: Alphabetically order

Install

1. Make a hardware. Each button will choose a genre, plus an optional button for pause (see settings.h).

2. apt install \
   libhiredis-dev \
   librhash-dev \
   libmpv-dev \
   libgpiod-dev

In Debian 13 Trixie, libgpiod is broken. Fix:

sudo apt purge libgpiod\*
sudo apt install build-essential automake autoconf-archive libtool
git clone https://github.com/brgl/libgpiod.git
cd libgpiod
git checkout v1.6.x
autoreconf -vi
./configure --enable-tools=yes --enable-bindings-cxx
make
sudo make install

3. apt install redis \
   && service redis start

4. git clone https://github.com/sagb/zenplay.git \
   && cd zenplay

5. Edit settings.h

6. make \
   && make install

7. zenindex (index all songs once)
   -or-
   zenindex [-p] dir1 dir2 ...
   -p: purge redis tables before index

8. zenplay (play random file and learn listen duration)
   -or-
   zenplay file1 file2 ... (debug mode, database not used)