#!/bin/sh
# Reports what audio a rooted webOS TV actually exposes.
#
# Which capture backend works depends on the model and firmware: some sets run
# PulseAudio with a monitor source, some only offer ALSA, some need an external
# helper. Run this once on the TV and the answer is usually obvious.
#
# On the TV:
#     sh tv-probe.sh
#
# From here, over the Homebrew Channel's ssh:
#     ssh -p 9922 root@TV-IP 'sh -s' < tools/tv-probe.sh
#     ares-shell --device tv -r "$(cat tools/tv-probe.sh)"
#
# Reads only. Nothing here changes the TV.

header() {
  printf '\n=== %s\n' "$1"
}

have() {
  command -v "$1" >/dev/null 2>&1
}

show() {
  # show <label> <file>
  if [ -r "$2" ]; then
    printf -- '--- %s\n' "$1"
    cat "$2"
  fi
}

header "Identity"
printf 'uid:      %s\n' "$(id -u 2>/dev/null)"
printf 'kernel:   %s\n' "$(uname -r 2>/dev/null)"
printf 'machine:  %s\n' "$(uname -m 2>/dev/null)"
for f in /etc/starfish-release /etc/os-release; do
  show "$f" "$f"
done
if [ -r /var/run/nyx/device_info.json ]; then
  printf -- '--- device info\n'
  cat /var/run/nyx/device_info.json
  printf '\n'
fi

header "Sound devices"
if [ -d /dev/snd ]; then
  ls -l /dev/snd
else
  echo "no /dev/snd — the ALSA backend cannot work"
fi

header "ALSA"
show "cards" /proc/asound/cards
show "pcm" /proc/asound/pcm
show "modules" /proc/asound/modules
if [ -d /proc/asound ]; then
  for dir in /proc/asound/card*/pcm*c; do
    [ -d "$dir" ] || continue
    printf -- '--- capture stream %s\n' "$dir"
    [ -r "$dir/info" ] && cat "$dir/info"
  done
else
  echo "no /proc/asound — no ALSA on this firmware"
fi

header "Tools"
for tool in arecord aplay amixer pactl parec pacat pulseaudio gst-launch-1.0 ffmpeg luna-send; do
  if have "$tool"; then
    printf '%-16s %s\n' "$tool" "$(command -v "$tool")"
  else
    printf '%-16s -\n' "$tool"
  fi
done

header "Libraries"
# The service dlopen()s these rather than linking them, so what matters is
# whether the file exists at all and under which soname.
for pattern in \
  /usr/lib/libasound.so* /lib/libasound.so* \
  /usr/lib/libpulse.so* /lib/libpulse.so* \
  /usr/lib/libpulse-simple.so* /lib/libpulse-simple.so*
do
  for lib in $pattern; do
    [ -e "$lib" ] && ls -l "$lib"
  done
done 2>/dev/null

header "PulseAudio"
ps ax 2>/dev/null | grep -i '[p]ulseaudio' || ps 2>/dev/null | grep -i '[p]ulseaudio' \
  || echo "no pulseaudio process found"
printf -- '--- sockets\n'
for sock in /var/run/pulse/native /run/pulse/native /tmp/pulse-*/native \
            /var/run/pulse/*.socket /dev/socket/pulse/*
do
  [ -e "$sock" ] && ls -l "$sock"
done 2>/dev/null
printf -- '--- environment of the audio daemon\n'
for pid in $(ps ax 2>/dev/null | grep -i '[a]udiod\|[p]ulseaudio' | awk '{print $1}'); do
  if [ -r "/proc/$pid/environ" ]; then
    printf 'pid %s: ' "$pid"
    tr '\0' '\n' < "/proc/$pid/environ" | grep -i 'PULSE\|XDG_RUNTIME' | tr '\n' ' '
    printf '\n'
  fi
done

if have pactl; then
  printf -- '--- pactl info\n'
  PULSE_SERVER="${PULSE_SERVER:-unix:/var/run/pulse/native}" pactl info 2>&1 | head -20
  printf -- '--- sources (monitors are what to capture)\n'
  PULSE_SERVER="${PULSE_SERVER:-unix:/var/run/pulse/native}" pactl list short sources 2>&1
fi

if have arecord; then
  header "ALSA capture devices (arecord -l)"
  arecord -l 2>&1
  printf -- '--- PCMs (arecord -L)\n'
  arecord -L 2>&1 | head -40
fi

header "What to put in the app"
cat <<'EOF'
Look at the output above and set Capture > Backend accordingly:

  PulseAudio   a pulseaudio process and a socket exist, and pactl lists a
               source ending in ".monitor". Use that name as the Device, or
               leave Device blank to take the default monitor.

  ALSA         /proc/asound lists a card with a capture PCM. Use hw:X,Y with
               the card and device numbers from "arecord -l".

  Command      neither works but arecord/parec/gst-launch is present. Set the
               Command to something that writes raw S16LE to stdout, e.g.
                 arecord -D hw:0,0 -f S16_LE -r 48000 -c 2 -t raw

  Test tone    nothing at all. Use this to prove the network path works while
               you keep looking.

If everything is missing, the audio path on this firmware is locked inside the
proprietary audio daemon. Every sink depends on captured audio, so the test
tone is all that will run until a capture route is found — use it to prove the
network side, then come back to this list.
EOF