647 lines
21 KiB
Python
647 lines
21 KiB
Python
"""
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BAPSicle Server
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Next-gen audio playout server for University Radio York playout,
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based on WebStudio interface.
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Audio Player
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Authors:
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Matthew Stratford
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Michael Grace
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Date:
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October, November 2020
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"""
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# This is the player. Reliability is critical here, so we're catching
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# literally every exception possible and handling it.
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# It is key that whenever the parent server tells us to do something
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# that we respond with something, FAIL or OKAY. The server doesn't like to be kept waiting.
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from helpers.types import PlayerState, RepeatMode
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from queue import Empty
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import multiprocessing
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import setproctitle
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import copy
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import json
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import time
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from typing import Any, Callable, Dict, List, Optional
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from plan import PlanItem
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# Stop the Pygame Hello message.
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import os
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os.environ['PYGAME_HIDE_SUPPORT_PROMPT'] = "hide"
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from pygame import mixer, NOEVENT, USEREVENT, event, init
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from mutagen.mp3 import MP3
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from helpers.myradio_api import MyRadioAPI
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from helpers.os_environment import isMacOS
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from helpers.state_manager import StateManager
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from helpers.logging_manager import LoggingManager
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PLAYBACK_END = USEREVENT + 1
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# TODO ENUM
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VALID_MESSAGE_SOURCES = ["WEBSOCKET", "UI", "CONTROLLER", "ALL"]
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class Player():
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out_q: multiprocessing.Queue
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last_msg: str
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last_msg_source: str
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last_time_update = None
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state: StateManager
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logger: LoggingManager
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api: MyRadioAPI
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running: bool = False
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already_stopped: bool = False
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starting: bool = False
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__default_state = {
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"initialised": False,
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"loaded_item": None,
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"channel": -1,
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"playing": False,
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"paused": False,
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"loaded": False,
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"pos": 0,
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"pos_offset": 0,
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"pos_true": 0,
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"remaining": 0,
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"length": 0,
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"auto_advance": True,
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"repeat": "none", # none, one or all
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"play_on_load": False,
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"output": None,
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"show_plan": []
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}
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__rate_limited_params = [
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"pos",
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"pos_offset",
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"pos_true",
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"remaining"
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]
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@property
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def isInit(self):
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try:
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mixer.music.get_busy()
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except:
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return False
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return True
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@property
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def isPlaying(self):
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if self.isInit:
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return (not self.isPaused) and bool(mixer.music.get_busy())
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return False
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@property
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def isPaused(self) -> bool:
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return self.state.state["paused"]
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@property
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def isLoaded(self):
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if not self.state.state["loaded_item"]:
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return False
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if self.isPlaying:
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return True
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# Because Pygame/SDL is annoying
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# We're not playing now, so we can quickly test run
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# If that works, we're loaded.
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try:
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position: float = self.state.state["pos"]
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mixer.music.set_volume(0)
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mixer.music.play(0)
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except:
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try:
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mixer.music.set_volume(1)
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except:
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self.logger.log.exception("Failed to reset volume after attempting loaded test.")
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pass
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return False
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if position > 0:
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self.pause()
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else:
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self.stop()
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mixer.music.set_volume(1)
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return True
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@property
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def status(self):
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state = copy.copy(self.state.state)
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# Not the biggest fan of this, but maybe I'll get a better solution for this later
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state["loaded_item"] = state["loaded_item"].__dict__ if state["loaded_item"] else None
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state["show_plan"] = [repr.__dict__ for repr in state["show_plan"]]
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res = json.dumps(state)
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return res
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# Audio Playout Related Methods
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def play(self, pos: float = 0):
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if not self.isLoaded:
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return
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global starting
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global already_stopped
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starting = True
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try:
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mixer.music.play(0, pos)
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mixer.music.set_endevent(PLAYBACK_END)
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self.state.update("pos_offset", pos)
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except:
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self.logger.log.exception("Failed to play at pos: " + str(pos))
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return False
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self.state.update("paused", False)
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already_stopped = False
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return True
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def pause(self):
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try:
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mixer.music.pause()
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except:
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self.logger.log.exception("Failed to pause.")
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return False
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self.state.update("paused", True)
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return True
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def unpause(self):
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if not self.isPlaying:
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position: float = self.state.state["pos_true"]
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try:
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self.play(position)
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except:
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self.logger.log.exception("Failed to unpause from pos: " + str(position))
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return False
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self.state.update("paused", False)
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return True
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return False
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def stop(self):
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# if self.isPlaying or self.isPaused:
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try:
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mixer.music.stop()
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except:
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self.logger.log.exception("Failed to stop playing.")
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return False
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self.state.update("pos", 0)
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self.state.update("pos_offset", 0)
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self.state.update("pos_true", 0)
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self.state.update("paused", False)
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global already_stopped
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already_stopped = True
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return True
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# return False
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def seek(self, pos: float) -> bool:
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if self.isPlaying:
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try:
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self.play(pos)
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except:
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self.logger.log.exception("Failed to seek to pos: " + str(pos))
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return False
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return True
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else:
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self.state.update("paused", True)
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self._updateState(pos=pos)
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return True
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def set_auto_advance(self, message: bool) -> bool:
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self.state.update("auto_advance", message)
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return True
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def set_repeat(self, message: str) -> bool:
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if message in ["all", "one", "none"]:
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self.state.update("repeat", message)
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return True
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else:
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return False
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def set_play_on_load(self, message: bool) -> bool:
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self.state.update("play_on_load", message)
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return True
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# Show Plan Related Methods
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def get_plan(self, message: int):
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plan = self.api.get_showplan(message)
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self.clear_channel_plan()
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channel = self.state.state["channel"]
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self.logger.log.info(plan)
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if len(plan) > channel:
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for plan_item in plan[str(channel)]:
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try:
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self.add_to_plan(plan_item)
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except Exception as e:
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self.logger.log.critical("Failed to add item to show plan: {}".format(e))
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continue
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return True
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def add_to_plan(self, new_item: Dict[str, Any]) -> bool:
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new_item_obj = PlanItem(new_item)
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plan_copy: List[PlanItem] = copy.copy(self.state.state["show_plan"])
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# Shift any plan items after the new position down one to make space.
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for item in plan_copy:
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if item.weight >= new_item_obj.weight:
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item.weight += 1
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plan_copy += [new_item_obj] # Add the new item.
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def sort_weight(e: PlanItem):
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return e.weight
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plan_copy.sort(key=sort_weight) # Sort into weighted order.
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self.state.update("show_plan", plan_copy)
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return True
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def remove_from_plan(self, weight: int) -> bool:
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plan_copy: List[PlanItem] = copy.copy(self.state.state["show_plan"])
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found = False
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for i in plan_copy:
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if i.weight == weight:
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plan_copy.remove(i)
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found = True
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elif i.weight > weight: # Shuffle up the weights of the items following the deleted one.
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i.weight -= 1
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if found:
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self.state.update("show_plan", plan_copy)
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return True
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return False
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def clear_channel_plan(self) -> bool:
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self.state.update("show_plan", [])
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return True
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def load(self, weight: int):
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if not self.isPlaying:
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self.unload()
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showplan = self.state.state["show_plan"]
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loaded_item: Optional[PlanItem] = None
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for i in range(len(showplan)):
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if showplan[i].weight == weight:
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loaded_item = showplan[i]
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break
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if loaded_item == None:
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self.logger.log.error("Failed to find weight: {}".format(weight))
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return False
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if (loaded_item.filename == "" or loaded_item.filename == None):
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loaded_item.filename = self.api.get_filename(item = loaded_item)
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if not loaded_item.filename:
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return False
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self.state.update("loaded_item", loaded_item)
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for i in range(len(showplan)):
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if showplan[i].weight == weight:
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self.state.update("show_plan", index=i, value=loaded_item)
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break
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# TODO: Update the show plan filenames
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try:
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self.logger.log.info("Loading file: " + str(loaded_item.filename))
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mixer.music.load(loaded_item.filename)
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except:
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# We couldn't load that file.
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self.logger.log.exception("Couldn't load file: " + str(loaded_item.filename))
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return False
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try:
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if ".mp3" in loaded_item.filename:
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song = MP3(loaded_item.filename)
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self.state.update("length", song.info.length)
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else:
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self.state.update("length", mixer.Sound(loaded_item.filename).get_length()/1000)
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except:
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self.logger.log.exception("Failed to update the length of item.")
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return False
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if self.state.state["play_on_load"]:
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self.play()
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return True
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def unload(self):
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if not self.isPlaying:
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try:
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mixer.music.unload()
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self.state.update("paused", False)
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self.state.update("loaded_item", None)
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except:
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self.logger.log.exception("Failed to unload channel.")
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return False
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return not self.isLoaded
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def quit(self):
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try:
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mixer.quit()
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self.state.update("paused", False)
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self.logger.log.info("Quit mixer.")
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except:
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self.logger.log.exception("Failed to quit mixer.")
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def output(self, name: Optional[str] = None):
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wasPlaying = self.state.state["playing"]
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name = None if name == "none" else name
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self.quit()
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self.state.update("output", name)
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try:
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if name:
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mixer.init(44100, -16, 2, 1024, devicename=name)
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else:
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mixer.init(44100, -16, 2, 1024)
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except:
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self.logger.log.exception("Failed to init mixer with device name: " + str(name))
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return False
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loadedItem = self.state.state["loaded_item"]
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if (loadedItem):
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self.load(loadedItem.weight)
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if wasPlaying:
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self.unpause()
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return True
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def ended(self):
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loaded_item = self.state.state["loaded_item"]
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# check the existing state (not self.isPlaying)
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# Since this is called multiple times when pygame isn't playing.
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global starting
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if starting:
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print("Starting")
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starting = False
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return
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global already_stopped
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#print(already_stopped, self.state.state["remaining"], self.isPlaying)
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if loaded_item == None or already_stopped or (self.state.state["remaining"] > 1):
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return
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mixer.music.set_endevent(NOEVENT)
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already_stopped = True
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stopping = True
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# Track has ended
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print("Finished", loaded_item.name)
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# Repeat 1
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if self.state.state["repeat"] == "ONE":
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self.play()
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stopping = False
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# Auto Advance
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elif self.state.state["auto_advance"]:
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for i in range(len(self.state.state["show_plan"])):
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if self.state.state["show_plan"][i].weight == loaded_item.weight:
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if len(self.state.state["show_plan"]) > i+1:
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self.load(self.state.state["show_plan"][i+1].weight)
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break
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# Repeat All
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elif self.state.state["repeat"] == "ALL":
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self.load(self.state.state["show_plan"][0].weight)
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# Play on Load
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if self.state.state["play_on_load"]:
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self.play()
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stopping = False
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if stopping:
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self.stop()
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if self.out_q:
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self._retAll("STOPPED") # Tell clients that we've stopped playing.
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def _updateState(self, pos: Optional[float] = None):
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self.state.update("initialised", self.isInit)
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if self.isInit:
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if (pos):
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self.state.update("pos", max(0, pos))
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elif self.isPlaying:
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# Get one last update in, incase we're about to pause/stop it.
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self.state.update("pos", max(0, mixer.music.get_pos()/1000))
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elif not self.isPaused:
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self.state.update("pos", 0) # Reset back to 0 if stopped.
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self.state.update("pos_offset", 0)
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self.state.update("playing", self.isPlaying)
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self.state.update("loaded", self.isLoaded)
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self.state.update("pos_true", self.state.state["pos"] + self.state.state["pos_offset"])
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self.state.update("remaining", self.state.state["length"] - self.state.state["pos_true"])
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def _ping_times(self):
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UPDATES_FREQ_SECS = 0.2
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if self.last_time_update == None or self.last_time_update + UPDATES_FREQ_SECS < time.time():
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self.last_time_update = time.time()
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self._retAll("POS:" + str(int(self.state.state["pos_true"])))
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def _retAll(self, msg):
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self.out_q.put("ALL:" + msg)
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def _retMsg(self, msg: Any, okay_str: bool = False, custom_prefix: Optional[str] = None):
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# Make sure to add the message source back, so that it can be sent to the correct destination in the main server.
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if custom_prefix:
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response = custom_prefix
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else:
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response = "{}:{}:".format(self.last_msg_source, self.last_msg)
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if msg == True:
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response += "OKAY"
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elif isinstance(msg, str):
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if okay_str:
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response += "OKAY:" + msg
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else:
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response += "FAIL:" + msg
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else:
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response += "FAIL"
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self.logger.log.debug(("Preparing to send: {}".format(response)))
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if self.out_q:
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self.logger.log.info(("Sending: {}".format(response)))
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self.out_q.put(response)
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def _send_status(self):
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# TODO This is hacky
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self._retMsg(str(self.status),okay_str=True,custom_prefix="ALL:STATUS:")
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def __init__(self, channel: int, in_q: multiprocessing.Queue, out_q: multiprocessing.Queue):
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process_title = "Player: Channel " + str(channel)
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setproctitle.setproctitle(process_title)
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multiprocessing.current_process().name = process_title
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# Init pygame, only used really for the end of playback trigger.
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#init()
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self.running = True
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self.out_q = out_q
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self.logger = LoggingManager("channel" + str(channel))
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self.api = MyRadioAPI(self.logger)
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self.state = StateManager("channel" + str(channel), self.logger,
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self.__default_state, self.__rate_limited_params)
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self.state.add_callback(self._send_status)
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self.state.update("channel", channel)
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loaded_state = copy.copy(self.state.state)
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if loaded_state["output"]:
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self.logger.log.info("Setting output to: " + str(loaded_state["output"]))
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self.output(loaded_state["output"])
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else:
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self.logger.log.info("Using default output device.")
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self.output()
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loaded_item = loaded_state["loaded_item"]
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if loaded_item:
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self.logger.log.info("Loading filename: " + str(loaded_item.filename))
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self.load(loaded_item.weight)
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if loaded_state["pos_true"] != 0:
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self.logger.log.info("Seeking to pos_true: " + str(loaded_state["pos_true"]))
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self.seek(loaded_state["pos_true"])
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if loaded_state["playing"] == True:
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self.logger.log.info("Resuming.")
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self.unpause()
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else:
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self.logger.log.info("No file was previously loaded.")
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try:
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while self.running:
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time.sleep(0.02)
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self._updateState()
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self._ping_times()
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try:
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message = in_q.get_nowait()
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source = message.split(":")[0]
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if source not in VALID_MESSAGE_SOURCES:
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self.last_msg_source = ""
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self.last_msg = ""
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self.logger.log.warn("Message from unknown sender source: {}".format(source))
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continue
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self.last_msg_source = source
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self.last_msg = message.split(":", 1)[1]
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self.logger.log.info("Recieved message from source {}: {}".format(self.last_msg_source, self.last_msg))
|
|
except Empty:
|
|
# The incomming message queue was empty,
|
|
# skip message processing
|
|
pass
|
|
else:
|
|
|
|
# We got a message.
|
|
|
|
# Output re-inits the mixer, so we can do this any time.
|
|
if (self.last_msg.startswith("OUTPUT")):
|
|
split = self.last_msg.split(":")
|
|
self._retMsg(self.output(split[1]))
|
|
|
|
elif self.isInit:
|
|
message_types: Dict[str, Callable[..., Any]] = { # TODO Check Types
|
|
"STATUS": lambda: self._retMsg(self.status, True),
|
|
|
|
# Audio Playout
|
|
"PLAY": lambda: self._retMsg(self.play()),
|
|
"PAUSE": lambda: self._retMsg(self.pause()),
|
|
"UNPAUSE": lambda: self._retMsg(self.unpause()),
|
|
"STOP": lambda: self._retMsg(self.stop()),
|
|
"SEEK": lambda: self._retMsg(self.seek(float(self.last_msg.split(":")[1]))),
|
|
"AUTOADVANCE": lambda: self._retMsg(self.set_auto_advance((self.last_msg.split(":")[1] == "True"))),
|
|
"REPEAT": lambda: self._retMsg(self.set_repeat(self.last_msg.split(":")[1])),
|
|
"PLAYONLOAD": lambda: self._retMsg(self.set_play_on_load((self.last_msg.split(":")[1] == "True"))),
|
|
|
|
# Show Plan Items
|
|
"GET_PLAN": lambda: self._retMsg(self.get_plan(int(self.last_msg.split(":")[1]))),
|
|
|
|
"LOAD": lambda: self._retMsg(self.load(int(self.last_msg.split(":")[1]))),
|
|
"LOADED?": lambda: self._retMsg(self.isLoaded),
|
|
"UNLOAD": lambda: self._retMsg(self.unload()),
|
|
"ADD": lambda: self._retMsg(self.add_to_plan(json.loads(":".join(self.last_msg.split(":")[1:])))),
|
|
"REMOVE": lambda: self._retMsg(self.remove_from_plan(int(self.last_msg.split(":")[1]))),
|
|
"CLEAR": lambda: self._retMsg(self.clear_channel_plan())
|
|
}
|
|
|
|
message_type: str = self.last_msg.split(":")[0]
|
|
|
|
if message_type in message_types.keys():
|
|
message_types[message_type]()
|
|
|
|
|
|
|
|
elif (self.last_msg == 'QUIT'):
|
|
self.running = False
|
|
continue
|
|
|
|
else:
|
|
self._retMsg("Unknown Command")
|
|
else:
|
|
|
|
if (self.last_msg == 'STATUS'):
|
|
self._retMsg(self.status)
|
|
else:
|
|
self._retMsg(False)
|
|
|
|
|
|
|
|
try:
|
|
callback_event = event.poll()
|
|
if callback_event.type == PLAYBACK_END:
|
|
self.ended()
|
|
else:
|
|
pass
|
|
except Exception as e:
|
|
pass
|
|
|
|
|
|
|
|
# Catch the player being killed externally.
|
|
except KeyboardInterrupt:
|
|
self.logger.log.info("Received KeyboardInterupt")
|
|
except SystemExit:
|
|
self.logger.log.info("Received SystemExit")
|
|
except Exception as e:
|
|
self.logger.log.exception("Received unexpected exception: {}".format(e))
|
|
|
|
self.logger.log.info("Quiting player " + str(channel))
|
|
self.quit()
|
|
self._retAll("EXIT")
|
|
del self.logger
|
|
os._exit(0)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
raise Exception("This BAPSicle Player is a subcomponenet, it will not run individually.")
|