#!/bin/bash

# run to capture audio, encode it to memory as high-quality ogg opus,
# then at any time save a replay of the last minutes of audio.
# REQUIRES logbufpipe, ffmpeg, date, pgrep, ps, tee, head, bash, and pwd in /tmp.

# bitrate: 512k -> 512*60/8 = 3.75 MiB/min, 225 MiB/hour.
# currently configured to record up to 60 minutes of audio using up to 250 MiB of memory.

DIR='/tmp/opusreplay1'
MONITOR='mark_combine_out_2.monitor'


# [ SETUP ]

mkdir -p "$DIR"
cd "$DIR" || exit 1


# [ CAPTURING via ffmpeg ]

ffmpeg -y -f pulse -i "$MONITOR" \
  -flush_packets 1 -f ogg -c:a libopus -application lowdelay \
  -b:a 512k - \
  | logbufpipe 230M audio.lbp \
  | head -c 1K > head.opus &
SRV="$(pgrep -P "$$" -n ffmpeg)"


# [ WEBUI via pyhttpcgi ]

echo 'not running' > index.html
tee save stop ls replay get rename delete > index <<< '#!/bin/bash'
chmod +x save stop ls replay get rename delete index
mkdir -p replays
mkdir -p deleted

echo "pgrep --quiet --pid '$SRV' || exit 1" >> index
echo "echo '<code>ffmpeg PID $SRV TIME'" >> index
echo "ps -p '$SRV' -o etime" >> index
echo "echo '(dont save more than this)</code>'" >> index
echo 'echo '"'"'<form method="get" target="hidden"><button type="submit" formaction="ls">List replays</button><button type="submit" formaction="save" name="SEC" value="15">Save last 15 seconds</button><button type="submit" formaction="save" name="MIN" value="1">Save last minute</button><button type="submit" formaction="save" name="MIN" value="5">Save last 5 minutes</button><button type="submit" formaction="save" name="MIN" value="10">Save last 10 minutes</button><button type="submit" formaction="save" name="MIN" value="30">Save last 30 minutes</button><button type="submit" formaction="stop">SHUT DOWN</button><iframe id="hidden" name="hidden" style="display:block;width:90vw;height:70vh;"></iframe></form>'"'" >> index

echo 'set -e' >> save
echo 'FILENAME="$(date -I)_$(date +%H-%M-%S).opus"' >> save
echo '(KIB="$(($(($ARG_MIN))*3840+$(($ARG_SEC))*64))" ; cat head.opus ; logbufpipe raw "$KIB"K audio.lbp | head -c "$((KIB+128))"K) | ffmpeg -f ogg -i - -f ogg -c:a copy -ss 2 "replays/$FILENAME"' >> save
echo 'echo "saved as <a href=\"./replay?f=$FILENAME\">$FILENAME</a>"' >> save

echo "pkill -P '$$' ffmpeg" >> stop
echo "pkill -P '$$' python3" >> stop

echo 'cd replays || exit 1' >> ls
echo 'for f in *; do' >> ls
echo '  echo "<div><a href=\"./replay?f=$f\">$f</a></div>"' >> ls
echo 'done' >> ls

echo 'echo "<h4><code>$ARG_f</code></h4>"' >> replay
echo 'echo "<form action=\"./rename\" method=\"get\"><input type=\"hidden\" name=\"from\" value=\"$ARG_f\"><input type=\"text\" name=\"to\" placeholder=\"new name without .opus\"><input type=\"submit\" value=\"rename\"><input type=\"submit\" formaction=\"./delete\" value=\"DELETE\"></form>"' >> replay
echo 'echo "<video controls src=\"./get?f=$ARG_f\"></video>"' >> replay
echo 'echo "<pre><code>"' >> replay
echo 'ls -lh "replays/$ARG_f"' >> replay
echo 'echo "</code></pre>"' >> replay

echo 'cat "replays/$ARG_f"' >> get

echo 'if [ -z "$ARG_from" ] || [ -z "$ARG_to" ]; then exit 1; fi' >> rename
echo 'mv -b "replays/$ARG_from" "replays/$ARG_to.opus" && echo renamed || echo rename failed' >> rename

echo 'if [ -z "$ARG_from" ]; then exit 1; fi' >> delete
echo 'mv "replays/$ARG_from" "deleted"' >> delete

python3 -c "$(base64 -d <<< ZnJvbSBodHRwLnNlcnZlciBpbXBvcnQgQmFzZUhUVFBSZXF1ZXN0SGFuZGxlciwgSFRUUFNlcnZlcgpmcm9tIHVybGxpYi5wYXJzZSBpbXBvcnQgdXJsc3BsaXQsIHBhcnNlX3FzCmZyb20gc3VicHJvY2VzcyBpbXBvcnQgcnVuCmZyb20gc3lzIGltcG9ydCBhcmd2LCBleGl0CmZyb20gb3MgaW1wb3J0IGVudmlyb24KCmlmIGxlbihhcmd2KSA8PSAxOgoJcHJpbnQoIkFyZzogYWRkcjpwb3J0LCBvciBwb3J0IChsb2NhbGhvc3QpLCBvciA6cG9ydCAoYWxsIGludGVyZmFjZXMpIikKCWV4aXQoMCkKaWYgJzonIGluIGFyZ3ZbMV06CglBRERSID0gYXJndlsxXS5yc3BsaXQoJzonLCAxKQoJUE9SVCA9IGludChBRERSWzFdKQoJQUREUiA9IEFERFJbMF0KZWxzZToKCUFERFIgPSAnbG9jYWxob3N0JwoJUE9SVCA9IGludChhcmd2WzFdKQpwcmludChmJ0xpc3RlbmluZyBvbiB7QUREUiBvciAnKid9OntQT1JUfScpCgp0cnk6Cgl3aXRoIG9wZW4oJ2luZGV4Lmh0bWwnLCAncmInKSBhcyBmOgoJCUlYID0gZi5yZWFkKCkKZXhjZXB0OgoJSVggPSBOb25lCgpkZWYgYWxudW0odik6CglyZXR1cm4gYWxsKChjIGluICdhYmNkZWZnaGlqa2xtbm9wcXJzdHV2d3h5ekFCQ0RFRkdISUpLTE1OT1BRUlNUVVZXWFlaMDEyMzQ1Njc4OV8tLicgZm9yIGMgaW4gdikpIGFuZCBub3Qgdi5zdGFydHN3aXRoKCIuIikKCmNsYXNzIEhhbmRsZXIoQmFzZUhUVFBSZXF1ZXN0SGFuZGxlcik6CglkZWYgZG9fR0VUKHNlbGYpOgoJCXUgPSB1cmxzcGxpdChzZWxmLnBhdGgpCgkJcCA9IHUucGF0aAoJCWEgPSBwYXJzZV9xcyh1LnF1ZXJ5KQoJCWlmIHAuc3RhcnRzd2l0aCgnLycpOgoJCQlwID0gcFsxOl0KCQlpZiBub3QgYWxudW0ocCk6CgkJCXNlbGYuc2VuZF9yZXNwb25zZSg0MDApCgkJCXNlbGYuZW5kX2hlYWRlcnMoKQoJCQlyZXR1cm4KCQljdCA9IE5vbmUKCQlpZiBsZW4ocCkgPT0gMDoKCQkJcCA9ICdpbmRleCcKCQkJY3QgPSBJWAoJCXRyeToKCQkJZW52ID0gTm9uZQoJCQlpZiBsZW4oYSkgPiAwOgoJCQkJZW52ID0gZGljdChlbnZpcm9uKQoJCQkJZm9yIGsgaW4gYToKCQkJCQlpZiBhbG51bShrKSBhbmQgbGVuKGFba10pID09IDEgYW5kIGFsbnVtKGFba11bMF0pOgoJCQkJCQllbnZbZidBUkdfe2t9J10gPSBhW2tdWzBdCgkJCWMgPSBydW4oYXJncz1bZicuL3twfSddLCBlbnY9ZW52LCBjaGVjaz1UcnVlLCBjYXB0dXJlX291dHB1dD1UcnVlKQoJCQljdCA9IGMuc3Rkb3V0CgkJZXhjZXB0OgoJCQlwYXNzCgkJaWYgY3QgaXMgTm9uZSBhbmQgKElYIGlzIE5vbmUgb3IgcCAhPSAnaW5kZXgnKToKCQkJc2VsZi5zZW5kX3Jlc3BvbnNlKDQwMCkKCQkJc2VsZi5lbmRfaGVhZGVycygpCgkJCXJldHVybgoJCXNlbGYuc2VuZF9yZXNwb25zZSgyMDApCgkJc2VsZi5zZW5kX2hlYWRlcignQ29udGVudC10eXBlJywgJ3RleHQvaHRtbCcpCgkJc2VsZi5lbmRfaGVhZGVycygpCgkJc2VsZi53ZmlsZS53cml0ZShjdCkKCkhUVFBTZXJ2ZXIoKEFERFIsIFBPUlQpLCBIYW5kbGVyKS5zZXJ2ZV9mb3JldmVyKCkK)" \
  :2602

echo "goodbye"


# [ SAVING via optional ffmpeg without webui ]

# MIN=1 SEC=0 \
#   ; (KIB="$(($MIN*3840+$SEC*64))" ; cat head.opus ; logbufpipe raw "$KIB"K audio.lbp | head -c "$((KIB+128))"K) \
#   | ffmpeg -f ogg -i - -f ogg -c:a copy -ss 2 replay_"$(date -I)"_"$(date +%H-%M-%S)".opus