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import logging
import os
import threading
import time
from enum import Enum, auto
from typing import Optional
from cozy.architecture.event_sender import EventSender
from cozy.report import reporter
from gi.repository import Gst
log = logging.getLogger("gst_player")
class GstPlayerState(Enum):
STOPPED = auto()
PAUSED = auto()
PLAYING = auto()
class GstPlayer(EventSender):
def __init__(self):
super().__init__()
self._bus: Optional[Gst.Bus] = None
self._player: Optional[Gst.Bin] = None
self._bus_signal_id: Optional[int] = None
self._playback_speed: float = 1.0
self._playback_speed_timer_running: bool = False
self._volume: float = 1.0
Gst.init(None)
@property
def position(self) -> int:
if not self._is_player_loaded():
return 0
position = self._query_gst_time(self._player.query_position)
if position:
return position
log.warning("Failed to query position from player.")
reporter.warning("gst_player", "Failed to query position from player.")
return 0
@position.setter
def position(self, new_position_ns: int):
new_position_ns = max(0, new_position_ns)
duration = self._query_gst_time(self._player.query_duration)
if duration:
new_position_ns = min(new_position_ns, duration)
self._execute_seek(new_position_ns)
@property
def playback_speed(self) -> float:
return self._playback_speed
@playback_speed.setter
def playback_speed(self, value: float):
if not self._is_player_loaded():
return
self._playback_speed = value
if self._playback_speed_timer_running:
return
self._playback_speed_timer_running = True
t = threading.Timer(0.2, self._on_playback_speed_timer)
t.name = "PlaybackSpeedDelayTimer"
t.start()
@property
def loaded_file_path(self) -> Optional[str]:
if not self._is_player_loaded():
return None
uri = self._player.get_property("current-uri")
if uri:
return uri.replace("file://", "")
else:
return None
@property
def state(self) -> GstPlayerState:
if not self._is_player_loaded():
return GstPlayerState.STOPPED
_, state, __ = self._player.get_state(Gst.CLOCK_TIME_NONE)
if state == Gst.State.PLAYING:
return GstPlayerState.PLAYING
elif state == Gst.State.PAUSED:
return GstPlayerState.PAUSED
else:
log.debug("GST player state was not playing or paused but %s", state)
return GstPlayerState.STOPPED
@property
def volume(self) -> float:
if not self._is_player_loaded():
log.error("Could not determine volume because player is not loaded.")
return 1.0
return self._player.get_property("volume")
@volume.setter
def volume(self, new_value: float):
self._volume = max(0.0, min(1.0, new_value))
if not self._is_player_loaded():
log.warning("Could not set volume because player is not loaded.")
return
self._player.set_property("volume", self._volume)
self._player.set_property("mute", False)
def init(self):
if self._player:
self.dispose()
self._player = Gst.ElementFactory.make("playbin", "player")
scaletempo = Gst.ElementFactory.make("scaletempo", "scaletempo")
scaletempo.sync_state_with_parent()
audiobin = Gst.ElementFactory.make("bin", "audiosink")
audiobin.add(scaletempo)
audiosink = Gst.ElementFactory.make("autoaudiosink", "audiosink")
audiobin.add(audiosink)
scaletempo.link(audiosink)
pad = scaletempo.get_static_pad("sink")
ghost_pad = Gst.GhostPad.new("sink", pad)
audiobin.add_pad(ghost_pad)
self._player.set_property("audio-sink", audiobin)
self._bus = self._player.get_bus()
self._bus.add_signal_watch()
self._bus_signal_id = self._bus.connect("message", self._on_gst_message)
def dispose(self):
if not self._player:
return
if self._bus_signal_id:
self._bus.disconnect(self._bus_signal_id)
self._player.set_state(Gst.State.NULL)
self._playback_speed = 1.0
log.info("Dispose")
self.emit_event("dispose")
def load_file(self, path: str):
self.init()
if not os.path.exists(path):
raise FileNotFoundError()
self._player.set_property("uri", "file://" + path)
self._player.set_state(Gst.State.PAUSED)
self._player.set_property("volume", self._volume)
self._player.set_property("mute", False)
def play(self):
if not self._is_player_loaded() or self.state == GstPlayerState.PLAYING:
return
success = self._player.set_state(Gst.State.PLAYING)
if success == Gst.StateChangeReturn.FAILURE:
log.warning("Failed set gst player to play.")
reporter.warning("gst_player", "Failed set gst player to play.")
else:
self.emit_event("state", GstPlayerState.PLAYING)
def pause(self):
if not self._is_player_loaded():
return
success = self._player.set_state(Gst.State.PAUSED)
if success == Gst.StateChangeReturn.FAILURE:
log.warning("Failed set gst player to pause.")
reporter.warning("gst_player", "Failed set gst player to pause.")
else:
self.emit_event("state", GstPlayerState.PAUSED)
def stop(self):
if not self._is_player_loaded():
return
self.dispose()
self.emit_event("state", GstPlayerState.STOPPED)
def _is_player_loaded(self) -> bool:
if not self._player:
return False
_, state, __ = self._player.get_state(Gst.CLOCK_TIME_NONE)
if state != Gst.State.PLAYING and state != Gst.State.PAUSED:
return False
return True
@staticmethod
def _query_gst_time(query_function) -> Optional[int]:
success = False
counter = 0
while not success and counter < 10:
success, value = query_function(Gst.Format.TIME)
if success:
return value
else:
counter += 1
time.sleep(0.01)
return None
def _execute_seek(self, new_position_ns: int):
counter = 0
seeked = False
while not seeked and counter < 500:
seeked = self._player.seek(self._playback_speed, Gst.Format.TIME, Gst.SeekFlags.FLUSH, Gst.SeekType.SET,
new_position_ns, Gst.SeekType.NONE, 0)
if not seeked:
counter += 1
time.sleep(0.01)
if not seeked:
log.info("Failed to seek, counter expired.")
reporter.warning("gst_player", "Failed to seek, counter expired.")
def _on_playback_speed_timer(self):
self._player.seek(self._playback_speed, Gst.Format.TIME, Gst.SeekFlags.FLUSH | Gst.SeekFlags.ACCURATE,
Gst.SeekType.SET, self.position, Gst.SeekType.NONE, 0)
self._playback_speed_timer_running = False
def _on_gst_message(self, _, message: Gst.Message):
t = message.type
if t == Gst.MessageType.BUFFERING:
if message.percentage < 100:
self._player.set_state(Gst.State.PAUSED)
log.info("Buffering…")
else:
self._player.set_state(Gst.State.PLAYING)
log.info("Buffering finished.")
elif t == Gst.MessageType.EOS:
self.emit_event("file-finished")
elif t == Gst.MessageType.ERROR:
error, debug_msg = message.parse_error()
if error.code == Gst.ResourceError.NOT_FOUND:
self.stop()
self.emit_event("resource-not-found")
log.warning("gst: Resource not found. Stopping player.")
reporter.warning("gst_player", "gst: Resource not found. Stopping player.")
return
reporter.error("player", f"{error.code}: {error}")
log.error("%s: %s", error.code, error)
log.debug(debug_msg)
self.emit_event("error", error)
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