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[media.mplayer] Plugin rewrite.

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Too many things were falling apart, and many others of MPlayer's "API
smells" had never been addressed.

The plugin has now largely been rewritten, and some workarounds (like
accessory monitoring processes) have been added to deal with the fact
that events like end-of-file aren't published by the player, and some
polling is required.
This commit is contained in:
Fabio Manganiello 2024-01-16 00:39:02 +01:00
parent ca25b3a4e6
commit e9d91471ce
Signed by: blacklight
GPG key ID: D90FBA7F76362774
2 changed files with 324 additions and 143 deletions
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429
platypush/plugins/media/mplayer/__init__.py
View file

@ -1,30 +1,57 @@
from dataclasses import asdict
import json
import os
import re
import select
import subprocess
import threading
import time
from dataclasses import asdict, dataclass
from multiprocessing import Process, Queue, RLock
from queue import Empty
from typing import Any, Collection, Dict, List, Optional
from platypush.context import get_bus
from platypush.message.response import Response
from platypush.plugins import action
from platypush.plugins.media import PlayerState, MediaPlugin
from platypush.message.event.media import (
MediaPlayEvent,
MediaPlayRequestEvent,
MediaPauseEvent,
MediaResumeEvent,
MediaStopEvent,
NewPlayingMediaEvent,
)
from platypush.plugins import action
from platypush.utils import find_bins_in_path
@dataclass
class MplayerStatus:
"""
MPlayer status object
"""
state: PlayerState = PlayerState.STOP
filename: Optional[str] = None
path: Optional[str] = None
title: Optional[str] = None
duration: Optional[float] = None
position: Optional[float] = None
percent_pos: Optional[float] = None
fullscreen: Optional[bool] = None
mute: Optional[bool] = None
pause: Optional[bool] = None
volume: Optional[float] = None
volume_max: Optional[float] = None
seekable: Optional[bool] = None
url: Optional[str] = None
class MediaMplayerPlugin(MediaPlugin):
"""
Plugin to control MPlayer instances.
Note that some plugin methods are populated dynamically by introspecting the
mplayer executable. You can verify the supported methods at runtime by
running the :meth:`.list_actions` action.
"""
_mplayer_default_communicate_timeout = 0.5
@ -41,16 +68,15 @@ class MediaMplayerPlugin(MediaPlugin):
def __init__(
self,
fullscreen: bool = False,
mplayer_bin: Optional[str] = None,
mplayer_timeout: float = _mplayer_default_communicate_timeout,
args: Optional[Collection[str]] = None,
**kwargs,
):
"""
Create the MPlayer wrapper. Note that the plugin methods are populated
dynamically by introspecting the mplayer executable. You can verify the
supported methods at runtime by using the `list_actions` method.
:param fullscreen: If set to True then the player will be started in
fullscreen mode (default: False)
:param mplayer_bin: Path to the MPlayer executable (default: search for
the first occurrence in your system PATH environment variable)
:param mplayer_timeout: Timeout in seconds to wait for more data
@ -63,11 +89,16 @@ class MediaMplayerPlugin(MediaPlugin):
self.args = args or []
self._init_mplayer_bin(mplayer_bin=mplayer_bin)
self._fullscreen = fullscreen
self._build_actions()
self._player = None
self._mplayer_timeout = mplayer_timeout
self._mplayer_stopped_event = threading.Event()
self._status_lock = threading.Lock()
self._status = MplayerStatus()
self._answer_queue = Queue()
self._proc_monitor: Optional[Process] = None
self._cmd_lock = RLock()
self._cleanup_lock = RLock()
def _init_mplayer_bin(self, mplayer_bin=None):
if not mplayer_bin:
@ -103,6 +134,9 @@ class MediaMplayerPlugin(MediaPlugin):
m_args = mplayer_args or []
args = [self.mplayer_bin] + self._mplayer_bin_default_args
if self._fullscreen and '-fs' not in args:
args.append('-fs')
for arg in (*self.args, *m_args):
if arg not in args:
args.append(arg)
@ -116,24 +150,24 @@ class MediaMplayerPlugin(MediaPlugin):
popen_args['env'] = self._env
self._player = subprocess.Popen(args, **popen_args)
threading.Thread(target=self._process_monitor()).start()
self._proc_monitor = Process(target=self._listener, name='mplayer-monitor')
self._proc_monitor.start()
def _build_actions(self):
"""Populates the actions list by introspecting the mplayer executable"""
self._actions = {}
mplayer = subprocess.Popen(
[self.mplayer_bin, '-input', 'cmdlist'],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
)
def args_pprint(txt):
lc = txt.lower()
if lc[0] == '[':
return f'{lc[1:-1]}=None'
return lc
self._actions = {}
with subprocess.Popen(
[self.mplayer_bin, '-input', 'cmdlist'],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
) as mplayer:
while True:
if not mplayer.stdout:
break
@ -141,9 +175,11 @@ class MediaMplayerPlugin(MediaPlugin):
line = mplayer.stdout.readline()
if not line:
break
line = line.decode()
if line[0].isupper():
continue
args = line.split()
cmd_name = args.pop(0)
arguments = ', '.join([args_pprint(a) for a in args])
@ -151,10 +187,8 @@ class MediaMplayerPlugin(MediaPlugin):
def _exec(
self, cmd, *args, mplayer_args=None, prefix=None, wait_for_response=False
):
) -> Optional[dict]:
cmd_name = cmd
response = None
if cmd_name in {'loadfile', 'loadlist'}:
self._init_mplayer(mplayer_args)
else:
@ -170,62 +204,129 @@ class MediaMplayerPlugin(MediaPlugin):
).encode()
if not self._player:
self.logger.warning('Cannot send command %s: player unavailable', cmd)
return
self.logger.debug('Cannot send command %s: player unavailable', cmd)
return None
if not self._player.stdin:
if not (self._player.stdin and self._player.stdin.writable()):
self.logger.warning(
'Could not communicate with the mplayer process: the stdin is closed'
)
return
return None
# Make sure that the response queue is empty before waiting for a new response
while not self._answer_queue.empty():
self._answer_queue.get()
self.logger.debug('mplayer interface:: Sending command: %s', cmd)
with self._cmd_lock:
try:
self._player.stdin.write(cmd)
self._player.stdin.flush()
except BrokenPipeError:
self.logger.info('The MPlayer process has terminated')
self._cleanup()
return None
except Exception as e:
self.logger.warning(
'Failed to send command %s: %s: %s', cmd, type(e).__name__, e
)
return None
if cmd_name in {'loadfile', 'loadlist'}:
self._post_event(NewPlayingMediaEvent, resource=args[0])
elif cmd_name == 'pause':
self._post_event(MediaPauseEvent)
elif cmd_name == 'quit':
self._player.terminate()
self._player.wait()
try:
self._player.kill()
except Exception:
pass
self._player = None
if not wait_for_response:
return
return None
if not (self._player and self._player.stdout):
self.logger.warning(
'Could not communicate with the mplayer process: the stdout is closed'
# Get the response from the queue
try:
ret, status = self._answer_queue.get(
block=True, timeout=self._mplayer_timeout
)
return
self._status = status
except Empty:
self.logger.warning('No response from mplayer for command %s', cmd)
return None
poll = select.poll()
poll.register(self._player.stdout, select.POLLIN)
last_read_time = time.time()
return ret
while time.time() - last_read_time < self._mplayer_timeout:
result = poll.poll(0)
if result:
if not self._player:
def _process_answer(self, answer: dict):
for k, v in answer.items():
if k == 'pause':
if v and self._status.state == PlayerState.PLAY:
self._status.state = PlayerState.PAUSE
self._post_event(MediaPauseEvent)
elif not v:
if self._status.state == PlayerState.PAUSE:
self._post_event(MediaResumeEvent)
elif self._status.state == PlayerState.STOP:
self._post_event(MediaPlayEvent)
self._status.state = PlayerState.PLAY
elif k == 'filename':
self._status.filename = v
elif k == 'path':
self._status.path = v
self._status.url = (
'file://' if os.path.isfile(v) else ''
) + self._status.path
elif k == 'fullscreen':
self._status.fullscreen = v
elif k == 'mute':
self._status.mute = v
elif k == 'percent_pos':
self._status.percent_pos = v
elif k == 'time_pos':
self._status.position = v
elif k == 'volume':
self._status.volume = v
elif k == 'length':
self._status.duration = v
self._answer_queue.put((answer, self._status))
def _status_checker(self):
try:
while self._player and self._player.stdin and self._player.stdin.writable():
try:
self._get_property('filename')
except (IOError, ValueError, KeyboardInterrupt):
break
finally:
time.sleep(1)
except Exception as e:
self.logger.warning('mplayer status checker process failed: %s', e)
def _listener(self):
status_checker = Process(
target=self._status_checker, name='mplayer-status-checker'
)
try:
status_checker.start()
while (
self._player and self._player.stdout and self._player.stdout.readable()
):
try:
buf = self._player.stdout.readline()
except (IOError, ValueError, KeyboardInterrupt):
break
buf = self._player.stdout.readline()
line = buf.decode() if isinstance(buf, bytes) else buf
last_read_time = time.time()
self.logger.debug('mplayer interface:: Received line: %s', buf)
if not line:
break
if line.startswith('ANS_'):
m = re.match('^([^=]+)=(.*)$', line[4:])
m = re.match(r'^([^=]+)=(.*)\s*$', line[4:])
if not m:
self.logger.warning('Unexpected response: %s', line)
break
k, v = m.group(1), m.group(2)
v = v.strip()
if v == 'yes':
v = True
elif v == 'no':
@ -233,13 +334,31 @@ class MediaMplayerPlugin(MediaPlugin):
try:
if isinstance(v, str):
v = eval(v) # pylint: disable=eval-used
v = json.loads(v)
except (TypeError, ValueError):
pass
self._process_answer({k: v})
elif line.startswith('Starting playback'):
self._status.state = PlayerState.PLAY
self._post_event(MediaPlayEvent)
finally:
if status_checker and status_checker.is_alive():
status_checker.terminate()
status_checker.join(timeout=5)
try:
status_checker.kill()
except Exception:
pass
response = {k: v}
if self._player:
self._player.wait()
try:
self.quit()
except Exception:
pass
return response
self._player = None
@action
def execute(self, cmd, args=None):
@ -259,28 +378,16 @@ class MediaMplayerPlugin(MediaPlugin):
for a in sorted(self._actions.keys())
]
def _process_monitor(self):
def _thread():
if not self._player:
return
self._mplayer_stopped_event.clear()
self._player.wait()
try:
self.quit()
except Exception:
pass
self._post_event(MediaStopEvent)
self._mplayer_stopped_event.set()
self._player = None
return _thread
@staticmethod
def _post_event(evt_type, **evt):
bus = get_bus()
bus.post(evt_type(player='local', plugin='media.mplayer', **evt))
def _post_event(self, evt_type, **evt):
self._bus.post(
evt_type(
player='local',
plugin='media.mplayer',
resource=evt.pop('resource', self._status.url),
title=self._status.title or self._status.filename,
**evt,
)
)
@action
def play(
@ -288,6 +395,7 @@ class MediaMplayerPlugin(MediaPlugin):
resource: str,
subtitles: Optional[str] = None,
mplayer_args: Optional[List[str]] = None,
**_,
):
"""
Play a resource.
@ -309,8 +417,6 @@ class MediaMplayerPlugin(MediaPlugin):
resource = resource[7:]
self._exec('loadfile', resource, mplayer_args=mplayer_args)
self._post_event(MediaPlayEvent, resource=resource)
if self.volume:
self.set_volume(volume=self.volume)
@ -320,35 +426,73 @@ class MediaMplayerPlugin(MediaPlugin):
def pause(self, *_, **__):
"""Toggle the paused state"""
self._exec('pause')
self._post_event(MediaPauseEvent)
return self.status()
@action
def stop(self, *_, **__):
"""Stop the playback"""
# return self._exec('stop')
self.quit()
return self.status()
return self.quit()
def _cleanup(self):
with self._cleanup_lock:
if self._player:
self._player.terminate()
self._player.wait()
try:
self._player.kill()
except Exception:
pass
self._player = None
self._post_event(MediaStopEvent)
if self._proc_monitor and os.getpid() != self._proc_monitor.pid:
try:
self._proc_monitor.terminate()
except Exception as e:
if self._proc_monitor or self._proc_monitor.is_alive():
self.logger.warning(
'Failed to terminate MPlayer monitor process: %s', e
)
if self._proc_monitor:
try:
self._proc_monitor.join(timeout=5)
except AssertionError: # Can only join a child process
pass
try:
self._proc_monitor.kill()
except Exception:
pass
self._proc_monitor = None
@action
def quit(self, *_, **__):
"""Quit the player"""
self._exec('quit')
self._post_event(MediaStopEvent)
self._cleanup()
return self.status()
@action
def voldown(self, *_, step=5.0, **__):
def voldown(self, *_, step=10.0, **__):
"""Volume down by (default: 10)%"""
self._exec('volume', -step * 10)
volume = (self._get_property('volume') or {}).get('volume')
if volume is None:
return self.status()
return self.set_volume(volume=volume - step)
@action
def volup(self, *_, step=5.0, **__):
def volup(self, *_, step=10.0, **__):
"""Volume up by (default: 10)%"""
self._exec('volume', step * 10)
volume = (self._get_property('volume') or {}).get('volume')
if volume is None:
return self.status()
return self.set_volume(volume=volume + step)
@action
def back(self, *_, offset=30.0, **__):
"""Back by (default: 30) seconds"""
@ -364,9 +508,7 @@ class MediaMplayerPlugin(MediaPlugin):
@action
def toggle_subtitles(self, *_, **__):
"""Toggle the subtitles visibility"""
response: dict = (
self.get_property('sub_visibility').output or {} # type: ignore
)
response: dict = self._get_property('sub_visibility') or {}
subs = response.get('sub_visibility')
self._exec('sub_visibility', int(not subs))
return self.status()
@ -390,9 +532,9 @@ class MediaMplayerPlugin(MediaPlugin):
:param index: (1-based) index of the subtitles track to remove.
"""
if index is None:
self._exec('sub_remove')
self._exec('sub_remove', prefix='pausing_keep_force')
else:
self._exec('sub_remove', index)
self._exec('sub_remove', index, prefix='pausing_keep_force')
return self.status()
@ -416,28 +558,30 @@ class MediaMplayerPlugin(MediaPlugin):
@action
def mute(self, *_, **__):
"""Toggle mute state"""
self._exec('mute')
self._exec('mute', prefix='pausing_keep_force')
return self.status()
@action
def seek(self, position: float, *_, **__):
"""
Seek backward/forward by the specified number of seconds
Alias for :meth:`.set_position`
:param position: Number of seconds relative to the current cursor
:type position: int
"""
self.step_property('time_pos', position)
return self.status()
return self.set_position(position)
@action
def set_position(self, position: float, *_, **__):
"""
Seek backward/forward to the specified absolute position
Set the playback position.
:param position: Number of seconds from the start
:type position: int
"""
# cur_pos = (self._get_property('time_pos') or {}).get('time_pos')
# if cur_pos is None:
# return self.status()
# self.set_property('time_pos', position - cur_pos)
self.set_property('time_pos', position)
return self.status()
@ -447,9 +591,8 @@ class MediaMplayerPlugin(MediaPlugin):
Set the volume
:param volume: Volume value between 0 and 100
:type volume: float
"""
self._exec('volume', volume)
self._exec('volume', max(0, min(100, volume)), 1, prefix='pausing_keep_force')
return self.status()
@action
@ -461,9 +604,26 @@ class MediaMplayerPlugin(MediaPlugin):
Example::
output = {
"state": "play" # or "stop" or "pause"
.. code-block:: javascript
{
"duration": 300.0, // in seconds
"filename": "video.mp4",
"fullscreen": false,
"mute": false,
"name": "video.mp4",
"path": "/path/to/video.mp4",
"pause": false,
"percent_pos": 30.0,
"position": 90.0, // in seconds
"seekable": true,
"state": "play", // or "stop" or "pause"
"title": "My Video",
"volume": 50.0,
"volume_max": 100.0,
"url": "file:///path/to/video.mp4",
}
"""
if not self._player:
@ -513,20 +673,14 @@ class MediaMplayerPlugin(MediaPlugin):
return status
@action
def get_property(
def _get_property(
self,
property: str, # pylint: disable=redefined-builtin
args: Optional[Collection[str]] = None,
):
"""
Get a player property (e.g. pause, fullscreen etc.). See
https://www.mplayerhq.hu/DOCS/tech/slave.txt for a full list of the
available properties
"""
) -> dict:
args = args or []
response = Response(output={})
response = {}
errors = []
result = (
self._exec(
@ -539,18 +693,47 @@ class MediaMplayerPlugin(MediaPlugin):
or {}
)
for k, v in result.items():
if k == 'ERROR' and v not in response.errors:
if not isinstance(response.errors, list):
response.errors = []
response.errors.append(f'{property}{args}: {v}')
else:
if not isinstance(response.output, dict):
response.output = {}
response.output[k] = v
if not result:
return response
for k, v in result.items():
if k == 'ERROR' and v not in errors:
self._handle_property_error(property, args, v, errors)
else:
response[k] = v
assert not errors, f'get_property errors: {errors}'
return response
def _handle_property_error(
self,
property: str, # pylint: disable=redefined-builtin
args: Optional[Collection[str]],
error: str,
errors: List[str],
):
if error == 'PROPERTY_UNAVAILABLE':
# This is a workaround to detect the end-of-file event.
# When get_property('filename') returns PROPERTY_UNAVAILABLE
# it means that the player is no longer playing anything
if property == 'filename' and self._status.state != PlayerState.STOP:
self.quit()
else:
errors.append(f'{property}{args}: {error}')
@action
def get_property(
self,
property: str, # pylint: disable=redefined-builtin
args: Optional[Collection[str]] = None,
):
"""
Get a player property (e.g. pause, fullscreen etc.). See
https://www.mplayerhq.hu/DOCS/tech/slave.txt for a full list of the
available properties
"""
return self._get_property(property, args=args)
@action
def set_property(
self,

2
platypush/plugins/media/mpv/__init__.py
View file

@ -31,8 +31,6 @@ class MediaMpvPlugin(MediaPlugin):
self, args: Optional[Dict[str, Any]] = None, fullscreen: bool = False, **kwargs
):
"""
Create the MPV wrapper.
:param args: Default arguments that will be passed to the mpv executable
as a key-value dict (names without the `--` prefix). See `man mpv`
for available options.