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unique mpv player
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#!/usr/bin/env python | |
""" | |
This script emulates "unique application" functionality on Linux. When starting | |
playback with this script, it will try to reuse an already running instance of | |
mpv (but only if that was started with umpv). Other mpv instances (not started | |
by umpv) are ignored, and the script doesn't know about them. | |
This only takes filenames as arguments. Custom options can't be used; the script | |
interprets them as filenames. If mpv is already running, the files passed to | |
umpv are appended to mpv's internal playlist. If a file does not exist or is | |
otherwise not playable, mpv will skip the playlist entry when attempting to | |
play it (from the GUI perspective, it's silently ignored). | |
If mpv isn't running yet, this script will start mpv and let it control the | |
current terminal. It will not write output to stdout/stderr, because this | |
will typically just fill ~/.xsession-errors with garbage. | |
mpv will terminate if there are no more files to play, and running the umpv | |
script after that will start a new mpv instance. | |
Note that you can control the mpv instance by writing to the command fifo: | |
echo "cycle fullscreen" > ~/.umpv_fifo | |
Note: you can supply custom mpv path and options with the MPV environment | |
variable. The environment variable will be split on whitespace, and the | |
first item is used as path to mpv binary and the rest is passed as options | |
_if_ the script starts mpv. If mpv is not started by the script (i.e. mpv | |
is already running), this will be ignored. | |
""" | |
import sys | |
import os | |
import errno | |
import subprocess | |
import fcntl | |
import string | |
files = sys.argv[1:] | |
# this is the same method mpv uses to decide this | |
def is_url(filename): | |
parts = filename.split("://", 1) | |
if len(parts) < 2: | |
return False | |
# protocol prefix has no special characters => it's an URL | |
allowed_symbols = string.ascii_letters + string.digits + '_' | |
prefix = parts[0] | |
return all(map(lambda c: c in allowed_symbols, prefix)) | |
# make them absolute; also makes them safe against interpretation as options | |
def make_abs(filename): | |
if not is_url(filename): | |
return os.path.abspath(filename) | |
return filename | |
files = [make_abs(f) for f in files] | |
FIFO = os.path.join(os.getenv("HOME"), "tmp/umpv_fifo") | |
fifo_fd = -1 | |
try: | |
fifo_fd = os.open(FIFO, os.O_NONBLOCK | os.O_WRONLY) | |
except OSError as e: | |
if e.errno == errno.ENXIO: | |
pass # pipe has no writer | |
elif e.errno == errno.ENOENT: | |
pass # doesn't exist | |
else: | |
raise e | |
if fifo_fd >= 0: | |
# Unhandled race condition: what if mpv is terminating right now? | |
fcntl.fcntl(fifo_fd, fcntl.F_SETFL, 0) # set blocking mode | |
fifo = os.fdopen(fifo_fd, "w") | |
action = "replace" | |
for f in files: | |
# escape: \ \n " | |
f = f.replace("\\", "\\\\").replace("\"", "\\\"").replace("\n", "\\n") | |
f = "\"" + f + "\"" | |
fifo.write("raw loadfile " + f + " {}\n".format(action)) | |
action = "append" | |
else: | |
# Recreate pipe if it doesn't already exist. | |
# Also makes sure it's safe, and no other user can create a bogus pipe | |
# that breaks security. | |
try: | |
os.unlink(FIFO) | |
except OSError as e: | |
pass | |
os.mkfifo(FIFO, 0o600) | |
opts = (os.getenv("MPV") or "mpv").split() | |
opts.extend(["--no-terminal", "--profile=pseudo-gui", "--input-file=" + FIFO, | |
"--"]) | |
opts.extend(files) | |
subprocess.check_call(opts) | |
os.remove(FIFO) |
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