From d284fb7a137d69f2a846a2d7e08cd4aaa5233ef8 Mon Sep 17 00:00:00 2001 From: pacien Date: Thu, 7 Sep 2017 10:01:59 +0200 Subject: Add unique mpv instance management script --- umpv | 97 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 97 insertions(+) create mode 100755 umpv (limited to 'umpv') diff --git a/umpv b/umpv new file mode 100755 index 0000000..0080b44 --- /dev/null +++ b/umpv @@ -0,0 +1,97 @@ +#!/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 stat +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"), ".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") + for f in files: + # escape: \ \n " + f = f.replace("\\", "\\\\").replace("\"", "\\\"").replace("\n", "\\n") + f = "\"" + f + "\"" + fifo.write("raw loadfile " + f + " append\n") +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", "--force-window", "--input-file=" + FIFO, + "--"]) + opts.extend(files) + + subprocess.check_call(opts) -- cgit v1.2.3