player.py

"""
    BAPSicle Server
    Next-gen audio playout server for University Radio York playout,
    based on WebStudio interface.

    Audio Player

    Authors:
        Matthew Stratford
        Michael Grace

    Date:
        October, November 2020
"""

# This is the player. Reliability is critical here, so we're catching
# literally every exception possible and handling it.

# It is key that whenever the parent server tells us to do something
# that we respond with something, FAIL or OKAY. The server doesn't like to be kept waiting.

# Stop the Pygame Hello message.
import os
os.environ["PYGAME_HIDE_SUPPORT_PROMPT"] = "hide"
from helpers.os_environment import isLinux
# It's the only one we could get to work.
if isLinux():
    os.putenv('SDL_AUDIODRIVER', 'pulseaudio')

from queue import Empty
import multiprocessing
import setproctitle
import copy
import json
import time
from typing import Any, Callable, Dict, List, Optional
from pygame import mixer
from mutagen.mp3 import MP3
from syncer import sync
from threading import Timer
from datetime import datetime

from helpers.normalisation import get_normalised_filename_if_available, get_original_filename_from_normalised
from helpers.myradio_api import MyRadioAPI
from helpers.state_manager import StateManager
from helpers.logging_manager import LoggingManager
from baps_types.plan import PlanItem
from baps_types.marker import Marker
import package

# TODO ENUM
VALID_MESSAGE_SOURCES = ["WEBSOCKET", "UI", "CONTROLLER", "TEST", "ALL"]
TRACKLISTING_DELAYED_S = 20


class Player:
    out_q: multiprocessing.Queue
    last_msg: str
    last_msg_source: str
    last_time_update = None

    state: StateManager
    logger: LoggingManager
    api: MyRadioAPI

    running: bool = False

    stopped_manually: bool = False

    tracklist_start_timer: Optional[Timer] = None
    tracklist_end_timer: Optional[Timer] = None

    __default_state = {
        "initialised": False,
        "loaded_item": None,
        "channel": -1,
        "playing": False,
        "paused": False,
        "loaded": False,
        "pos": 0,
        "pos_offset": 0,
        "pos_true": 0,
        "remaining": 0,
        "length": 0,
        "auto_advance": True,
        "repeat": "none",  # none, one or all
        "play_on_load": False,
        "output": None,
        "show_plan": [],
        "live": True,
        "tracklist_mode": "off",
        "tracklist_id": None,
    }

    __rate_limited_params = ["pos", "pos_offset", "pos_true", "remaining"]

    @property
    def isInit(self):
        try:
            mixer.music.get_busy()
        except Exception:
            return False

        return True

    @property
    def isPlaying(self) -> bool:
        if self.isInit:
            return (not self.isPaused) and bool(mixer.music.get_busy())
        return False

    @property
    def isPaused(self) -> bool:
        return self.state.get()["paused"]

    @property
    def isLoaded(self):
        return self._isLoaded()

    def _isLoaded(self, short_test: bool = False):
        if not self.state.get()["loaded_item"]:
            return False
        if self.isPlaying:
            return True

        # If we don't want to do any testing if it's really loaded, fine.
        if short_test:
            return True

        # Because Pygame/SDL is annoying
        # We're not playing now, so we can quickly test run
        # If that works, we're loaded.
        try:
            mixer.music.set_volume(0)
            mixer.music.play(0)
        except Exception:
            try:
                mixer.music.set_volume(1)
            except Exception:
                self.logger.log.exception(
                    "Failed to reset volume after attempting loaded test."
                )
                pass
            return False
        finally:
            mixer.music.stop()

        mixer.music.set_volume(1)
        return True

    @property
    def isCued(self):
        # Don't mess with playback, we only care about if it's supposed to be loaded.
        if not self._isLoaded(short_test=True):
            return False
        return (
            self.state.get()["pos_true"] == self.state.get()["loaded_item"].cue
            and not self.isPlaying
        )

    @property
    def status(self):
        state = copy.copy(self.state.state)

        # Not the biggest fan of this, but maybe I'll get a better solution for this later
        state["loaded_item"] = (
            state["loaded_item"].__dict__ if state["loaded_item"] else None
        )
        state["show_plan"] = [repr.__dict__ for repr in state["show_plan"]]

        res = json.dumps(state)
        return res

    # Audio Playout Related Methods

    def play(self, pos: float = 0):
        self.logger.log.info("Playing from pos: " + str(pos))
        if not self.isLoaded:
            self.logger.log.warning("Player is not loaded.")
            return False
        try:
            mixer.music.play(0, pos)
            self.state.update("pos_offset", pos)
        except Exception:
            self.logger.log.exception("Failed to play at pos: " + str(pos))
            return False
        self.state.update("paused", False)
        self._potentially_tracklist()
        self.stopped_manually = False
        return True

    def pause(self):
        try:
            mixer.music.stop()
        except Exception:
            self.logger.log.exception("Failed to pause.")
            return False

        self.stopped_manually = True
        self.state.update("paused", True)
        return True

    def unpause(self):
        if not self.isPlaying:
            state = self.state.get()
            position: float = state["pos_true"]
            if not self.play(position):
                self.logger.log.exception(
                    "Failed to unpause from pos: " + str(position)
                )
                return False

            self.state.update("paused", False)

            # Increment Played count
            loaded_item = state["loaded_item"]
            if loaded_item:
                loaded_item.play_count_increment()
                self.state.update("loaded_item", loaded_item)

            return True
        return False

    def stop(self, user_initiated: bool = False):
        try:
            mixer.music.stop()
        except Exception:
            self.logger.log.exception("Failed to stop playing.")
            return False
        self.state.update("paused", False)

        if user_initiated:
            self._potentially_end_tracklist()

        self.stopped_manually = True

        if not self.state.get()["loaded_item"]:
            self.logger.log.warning("Tried to stop without a loaded item.")
            return True

        # This lets users toggle (using the stop button) between cue point and 0.
        if user_initiated and not self.isCued:
            # if there's a cue point ant we're not at it, go there.
            self.seek(self.state.get()["loaded_item"].cue)
        else:
            # Otherwise, let's go to 0.
            self.seek(0)

        return True

    def seek(self, pos: float) -> bool:
        self.logger.log.info("Seeking to pos:" + str(pos))
        if self.isPlaying:
            try:
                self.play(pos)
            except Exception:
                self.logger.log.exception("Failed to seek to pos: " + str(pos))
                return False
            return True
        else:
            self.logger.log.debug(
                "Not playing during seek, setting pos state for next play."
            )
            self.stopped_manually = True  # Don't trigger _ended() on seeking.
            if pos > 0:
                self.state.update("paused", True)
            self._updateState(pos=pos)
        return True

    def set_auto_advance(self, message: bool) -> bool:
        self.state.update("auto_advance", message)
        return True

    def set_repeat(self, message: str) -> bool:
        if message in ["all", "one", "none"]:
            self.state.update("repeat", message)
            return True
        else:
            return False

    def set_play_on_load(self, message: bool) -> bool:
        self.state.update("play_on_load", message)
        return True

    # Show Plan Related Methods
    def get_plan(self, message: int):
        plan = sync(self.api.get_showplan(message))
        self.clear_channel_plan()
        channel = self.state.get()["channel"]
        self.logger.log.debug(plan)
        if not isinstance(plan, dict):
            return False
        if str(channel) in plan.keys():
            for plan_item in plan[str(channel)]:
                try:
                    self.add_to_plan(plan_item)
                except Exception as e:
                    self.logger.log.critical(
                        "Failed to add item to show plan: {}".format(e)
                    )
                    continue

        return True

    def _check_ghosts(self, item: PlanItem):
        if isinstance(item.timeslotitemid, str) and item.timeslotitemid.startswith("I"):
            # Kinda a bodge for the moment, each "Ghost" (item which is not saved in the database showplan yet)
            # needs to have a unique temporary item.
            # To do this, we'll start with the channel number the item was originally added to
            # (to stop items somehow simultaneously added to different channels from having the same id)
            # And chuck in the unix epoch in ns for good measure.
            item.timeslotitemid = "GHOST-{}-{}".format(
                self.state.get()["channel"], time.time_ns()
            )
        return item

    # TODO Allow just moving an item inside the channel instead of removing and adding.
    def add_to_plan(self, new_item: Dict[str, Any]) -> bool:
        new_item_obj = PlanItem(new_item)
        new_item_obj = self._check_ghosts(new_item_obj)
        plan_copy: List[PlanItem] = copy.copy(self.state.get()["show_plan"])
        # Shift any plan items after the new position down one to make space.
        for item in plan_copy:
            if item.weight >= new_item_obj.weight:
                item.weight += 1

        plan_copy += [new_item_obj]  # Add the new item.

        self._fix_and_update_weights(plan_copy)

        loaded_item = self.state.get()["loaded_item"]
        if loaded_item:

            # Right. So this may be confusing.
            # So... If the user has just moved the loaded item in the channel (by removing above and readding)
            # Then we want to re-associate the loaded_item object reference with the new one.
            # The loaded item object before this change is now an orphan, which was
            # kept around while the loaded item was potentially moved to another
            # channel.
            if loaded_item.timeslotitemid == new_item_obj.timeslotitemid:
                self.state.update("loaded_item", new_item_obj)

            # NOPE NOPE NOPE
            # THIS IS AN EXAMPLE OF WHAT NOT TO DO!
            # ONCE AGAIN, THE LOADED ITEM IS THE SAME OBJECT INSTANCE AS THE ONE IN
            # THE SHOW PLAN (AS LONG AS IT HASN'T BEEN RE/MOVED)

            #    loaded_item.weight = new_item_obj.weight

            # Bump the loaded_item's weight if we just added a new item above it.
            # elif loaded_item.weight >= new_item_obj.weight:
            #     loaded_item.weight += 1

            # Else, new weight stays the same.
            # else:
            #     return True

            # self.state.update("loaded_item", loaded_item)

        return True

    def remove_from_plan(self, weight: int) -> bool:
        plan_copy: List[PlanItem] = copy.copy(self.state.get()["show_plan"])
        found: Optional[PlanItem] = None

        before = []
        for item in plan_copy:
            before += (item.weight, item.name)

        self.logger.log.debug(
            "Weights before removing weight {}:\n{}".format(weight, before)
        )

        for i in plan_copy:
            if i.weight == weight:
                found = i
                plan_copy.remove(i)

        if found:
            self._fix_and_update_weights(plan_copy)

            # If we removed the loaded item from this channel, update it's weight
            # So we know how/not to autoadvance.
            loaded_item = self.state.get()["loaded_item"]
            if loaded_item == found:
                # Loaded_item is actually the same PlanItem instance as in the show_plan.
                # So if it's still in the show plan, we'll have corrected it's weight already.
                # If it was removed above, fix_weights won't have done anything
                # So we'll want to update the weight.

                # We're removing the loaded item from the channel.
                # if loaded_item.weight == weight:
                loaded_item.weight = -1

                # If loaded_item wasn't the same instance, we'd want to do the below.

                # We removed an item above it. Shift it up.
                # elif loaded_item.weight > weight:
                #    loaded_item.weight -= 1
                # Else, new weight stays the same.
                # else:
                #    return True

                self.state.update("loaded_item", loaded_item)
            return True
        return False

    def clear_channel_plan(self) -> bool:
        self.state.update("show_plan", [])
        return True

    def load(self, weight: int):
        if not self.isPlaying:
            # If we have something loaded already, unload it first.
            self.unload()

            loaded_state = self.state.get()

            # Sometimes (at least on windows), the pygame player will lose output to the sound output after a while.
            # It's odd, but essentially, to stop / recover from this, we de-init the pygame mixer and init it again.
            self.logger.log.info(
                "Resetting output (in case of sound output gone silent somehow) to "
                + str(loaded_state["output"])
            )
            self.output(loaded_state["output"])

            showplan = loaded_state["show_plan"]

            loaded_item: Optional[PlanItem] = None

            # Go find the show plan item of the weight we've been asked to load.
            for i in range(len(showplan)):
                if showplan[i].weight == weight:
                    loaded_item = showplan[i]
                    break

            # If we didn't find it, exit.
            if loaded_item is None:
                self.logger.log.error(
                    "Failed to find weight: {}".format(weight))
                return False

            # This item exists, so we're comitting to load this item.
            self.state.update("loaded_item", loaded_item)

            # The file_manager helper may have pre-downloaded the file already, or we've played it before.
            reload = False
            if loaded_item.filename == "" or loaded_item.filename is None:
                self.logger.log.info(
                    "Filename is not specified, loading from API.")
                reload = True
            elif not os.path.exists(loaded_item.filename):
                self.logger.log.warn(
                    "Filename given doesn't exist. Re-loading from API."
                )
                reload = True

            # Ask the API for the file if we need it.
            if reload:
                file = sync(self.api.get_filename(item=loaded_item))
                loaded_item.filename = str(file) if file else None

            # If the API still couldn't get the file, RIP.
            if not loaded_item.filename:
                return False

            # Swap with a normalised version if it's ready, else returns original.
            loaded_item.filename = get_normalised_filename_if_available(
                loaded_item.filename
            )

            # Given we've just messed around with filenames etc, update the item again.
            self.state.update("loaded_item", loaded_item)
            for i in range(len(showplan)):
                if showplan[i].weight == weight:
                    self.state.update("show_plan", index=i, value=loaded_item)
                break

            load_attempt = 0

            # Let's have 5 attempts at loading the item audio
            while load_attempt < 5:
                load_attempt += 1

                original_file = None
                if load_attempt == 3:
                    # Ok, we tried twice already to load the file.
                    # Let's see if we can recover from this.
                    # Try swapping the normalised version out for the original.
                    original_file = get_original_filename_from_normalised(
                        loaded_item.filename
                    )
                    self.logger.log.warning("3rd attempt. Trying the non-normalised file: {}".format(original_file))

                if load_attempt == 4:
                    # well, we've got so far that the normalised and original files didn't load.
                    # Take a last ditch effort to download the original file again.
                    file = sync(self.api.get_filename(item=loaded_item, redownload=True))
                    if file:
                        original_file = str(file)
                    self.logger.log.warning("4rd attempt. Trying to redownload the file, got: {}".format(original_file))

                if original_file:
                    loaded_item.filename = original_file

                try:
                    self.logger.log.info(
                        "Attempt {} Loading file: {}".format(load_attempt, loaded_item.filename))
                    mixer.music.load(loaded_item.filename)
                except Exception:
                    # We couldn't load that file.
                    self.logger.log.exception(
                        "Couldn't load file: " + str(loaded_item.filename)
                    )
                    continue  # Try loading again.

                if not self.isLoaded:
                    self.logger.log.error(
                        "Pygame loaded file without error, but never actually loaded."
                    )
                    continue  # Try loading again.

                try:
                    if loaded_item.filename.endswith(".mp3"):
                        song = MP3(loaded_item.filename)
                        self.state.update("length", song.info.length)
                    else:
                        # WARNING! Pygame / SDL can't seek .wav files :/
                        self.state.update(
                            "length",
                            mixer.Sound(
                                loaded_item.filename).get_length() / 1000,
                        )
                except Exception:
                    self.logger.log.exception(
                        "Failed to update the length of item.")
                    continue  # Try loading again.

                # Everything worked, we made it!
                # Write the loaded item again once more, to confirm the filename if we've reattempted.
                self.state.update("loaded_item", loaded_item)

                if loaded_item.cue > 0:
                    self.seek(loaded_item.cue)
                else:
                    self.seek(0)

                if loaded_state["play_on_load"]:
                    self.unpause()

                return True

            # Even though we failed, make sure state is up to date with latest failure.
            # We're comitting to load this item.
            self.state.update("loaded_item", loaded_item)

        return False

    def unload(self):
        if not self.isPlaying:
            try:
                mixer.music.unload()
                self.state.update("paused", False)
                self.state.update("loaded_item", None)
            except Exception:
                self.logger.log.exception("Failed to unload channel.")
                return False

        self._potentially_end_tracklist()
        # If we unloaded successfully, reset the tracklist_id, ready for the next item.
        if not self.isLoaded:
            self.state.update("tracklist_id", None)

        return not self.isLoaded

    def quit(self):
        try:
            mixer.quit()
            self.state.update("paused", False)
            self.logger.log.info("Quit mixer.")
        except Exception:
            self.logger.log.exception("Failed to quit mixer.")

    def output(self, name: Optional[str] = None):
        wasPlaying = self.isPlaying

        state = self.state.get()
        oldPos = state["pos_true"]

        name = None if (not name or name.lower() == "none") else name

        self.quit()
        self.state.update("output", name)
        try:
            if name:
                mixer.init(44100, -16, 2, 1024, devicename=name)
            else:
                mixer.init(44100, -16, 2, 1024)
        except Exception:
            self.logger.log.exception(
                "Failed to init mixer with device name: " + str(name)
            )
            return False

        loadedItem = state["loaded_item"]
        if loadedItem:
            self.logger.log.info("Reloading after output change.")
            self.load(loadedItem.weight)
        if wasPlaying:
            self.logger.log.info("Resuming playback after output change.")
            self.play(oldPos)

        return True

    # Timeslotitemid can be a ghost (un-submitted item), so may be "IXXX"
    def set_marker(self, timeslotitemid: str, marker_str: str):
        set_loaded = False
        success = True
        try:
            marker = Marker(marker_str)
        except Exception as e:
            self.logger.log.error(
                "Failed to create Marker instance with {} {}: {}".format(
                    timeslotitemid, marker_str, e
                )
            )
            return False

        if timeslotitemid == "-1":
            set_loaded = True
            if not self.isLoaded:
                return False
            timeslotitemid = self.state.get()["loaded_item"].timeslotitemid
        elif (
            self.isLoaded
            and self.state.get()["loaded_item"].timeslotitemid == timeslotitemid
        ):
            set_loaded = True

        plan_copy: List[PlanItem] = copy.copy(self.state.get()["show_plan"])
        for i in range(len(self.state.get()["show_plan"])):

            item = plan_copy[i]

            if str(item.timeslotitemid) == str(timeslotitemid):
                try:
                    new_item = item.set_marker(marker)
                    self.state.update("show_plan", new_item, index=i)

                except Exception as e:
                    self.logger.log.error(
                        "Failed to set marker on item {}: {} with marker \n{}".format(
                            timeslotitemid, e, marker
                        )
                    )
                    success = False

        if set_loaded:
            try:
                self.state.update(
                    "loaded_item", self.state.get(
                    )["loaded_item"].set_marker(marker)
                )
            except Exception as e:
                self.logger.log.error(
                    "Failed to set marker on loaded_item {}: {} with marker \n{}".format(
                        timeslotitemid, e, marker
                    )
                )
                success = False

        return success

    def set_played(self, weight: int, played: bool):
        plan: List[PlanItem] = self.state.get()["show_plan"]
        if weight == -1:
            for item in plan:
                item.play_count_increment() if played else item.play_count_reset()
            self.state.update("show_plan", plan)
        elif len(plan) > weight:
            plan[weight].play_count_increment() if played else plan[
                weight
            ].play_count_reset()
            self.state.update("show_plan", plan[weight], weight)
        else:
            return False
        return True

    # Tells the player that the fader is live on-air, so it can tell tracklisting from PFL
    def set_live(self, live: bool):

        self.state.update("live", live)

        # If we're going to live (potentially from not live/PFL), potentially tracklist if it's playing.
        if live:
            self._potentially_tracklist()
        return True

    # Helper functions

    # This essentially allows the tracklist end API call to happen in a separate thread, to avoid hanging playout/loading.
    def _potentially_tracklist(self):
        mode = self.state.get()["tracklist_mode"]

        time: int = -1
        if mode in ["on", "fader-live"]:
            time = 1  # Let's do it pretty quickly.
        elif mode == "delayed":
            # Let's do it in a bit, once we're sure it's been playing. (Useful if we've got no idea if it's live or cueing.)
            time = TRACKLISTING_DELAYED_S

        if time >= 0 and not self.tracklist_start_timer:
            self.logger.log.info(
                "Setting timer for tracklisting in {} secs due to Mode: {}".format(
                    time, mode
                )
            )
            self.tracklist_start_timer = Timer(time, self._tracklist_start)
            self.tracklist_start_timer.start()
        elif self.tracklist_start_timer:
            self.logger.log.error(
                "Failed to potentially tracklist, timer already busy."
            )

    # This essentially allows the tracklist end API call to happen in a separate thread, to avoid hanging playout/loading.
    def _potentially_end_tracklist(self):

        if self.tracklist_start_timer:
            self.logger.log.info(
                "A tracklist start timer was running, cancelling.")
            self.tracklist_start_timer.cancel()
            self.tracklist_start_timer = None

            # Decrement Played count on track we didn't play much of.
            state = self.state.get()
            loaded_item = state["loaded_item"]
            if loaded_item and loaded_item.type == "central":
                loaded_item.play_count_decrement()
                self.state.update("loaded_item", loaded_item)

        # Make a copy of the tracklist_id, it will get reset as we load the next item.
        tracklist_id = self.state.get()["tracklist_id"]
        if not tracklist_id:
            self.logger.log.info("No tracklist to end.")
            return

        self.logger.log.info(
            "Setting timer for ending tracklist_id '{}'".format(tracklist_id)
        )
        if tracklist_id:
            self.logger.log.info(
                "Attempting to end tracklist_id '{}'".format(tracklist_id)
            )
            if self.tracklist_end_timer:
                self.logger.log.error(
                    "Failed to potentially end tracklist, timer already busy."
                )
                return
            self.state.update("tracklist_id", None)
            # This threads it, so it won't hang track loading if it fails.
            self.tracklist_end_timer = Timer(
                1, self._tracklist_end, [tracklist_id])
            self.tracklist_end_timer.start()
        else:
            self.logger.log.warning(
                "Failed to potentially end tracklist, no tracklist started."
            )

    def _tracklist_start(self):
        state = self.state.get()
        loaded_item = state["loaded_item"]
        if not loaded_item:
            self.logger.log.error(
                "Tried to call _tracklist_start() with no loaded item!"
            )

        elif not self.isPlaying:
            self.logger.log.info("Not tracklisting since not playing.")

        else:

            tracklist_id = state["tracklist_id"]
            if not tracklist_id:
                if state["tracklist_mode"] == "fader-live" and not state["live"]:
                    self.logger.log.info(
                        "Not tracklisting since fader is not live.")
                else:
                    self.logger.log.info(
                        "Tracklisting item: '{}'".format(loaded_item.name)
                    )
                    tracklist_id = self.api.post_tracklist_start(loaded_item)
                    if not tracklist_id:
                        self.logger.log.warning(
                            "Failed to tracklist '{}'".format(loaded_item.name)
                        )
                    else:
                        self.logger.log.info(
                            "Tracklist id: '{}'".format(tracklist_id))
                        self.state.update("tracklist_id", tracklist_id)
            else:
                self.logger.log.info(
                    "Not tracklisting item '{}', already got tracklistid: '{}'".format(
                        loaded_item.name, tracklist_id
                    )
                )

        # No matter what we end up doing, we need to kill this timer so future ones can run.
        self.tracklist_start_timer = None

    def _tracklist_end(self, tracklist_id):

        if tracklist_id:
            self.logger.log.info(
                "Attempting to end tracklist_id '{}'".format(tracklist_id)
            )
            self.api.post_tracklist_end(tracklist_id)
        else:
            self.logger.log.error(
                "Tracklist_id to _tracklist_end() missing. Failed to end tracklist."
            )

        self.tracklist_end_timer = None

    def _ended(self):
        self._potentially_end_tracklist()

        state = self.state.get()

        loaded_item = state["loaded_item"]

        if not loaded_item:
            return

        # Track has ended
        self.logger.log.info(
            "Playback ended of {}, weight {}:".format(
                loaded_item.name, loaded_item.weight
            )
        )
        # Just make sure that if we stop and do nothing, we end up at 0.
        self.state.update("pos", 0)

        # Repeat 1
        # TODO ENUM
        if state["repeat"] == "one":
            self.play()
            return

        # Auto Advance
        if state["auto_advance"]:

            # Check for loaded item in show plan.
            # If it's been removed, weight will be -1.
            # Just stop in this case.
            if loaded_item.weight < 0:
                self.logger.log.debug(
                    "Loaded item is no longer in channel (weight {}), not auto advancing.".format(
                        loaded_item.weight
                    )
                )
            else:
                self.logger.log.debug(
                    "Found current loaded item in this channel show plan. Auto Advancing."
                )

                # If there's another item after this one, load that.
                if len(state["show_plan"]) > loaded_item.weight + 1:
                    self.load(loaded_item.weight + 1)
                    return

                # Repeat All (Jump to top again)
                # TODO ENUM
                elif state["repeat"] == "all":
                    self.load(0)  # Jump to the top.
                    return

        # No automations, just stop playing.
        self.stop()
        self._retAll("STOPPED")  # Tell clients that we've stopped playing.

    def _updateState(self, pos: Optional[float] = None):

        self.state.update("initialised", self.isInit)
        if self.isInit:
            if pos is not None:
                # Seeking sets the position like this when not playing.
                self.state.update("pos", pos)  # Reset back to 0 if stopped.
                self.state.update("pos_offset", 0)
            elif self.isPlaying:
                # This is the bit that makes the time actually progress during playback.
                # Get one last update in, incase we're about to pause/stop it.
                self.state.update("pos", max(0, mixer.music.get_pos() / 1000))

            # If the state is changing from playing to not playing, and the user didn't stop it, the item must have ended.
            if (
                self.state.get()["playing"]
                and not self.isPlaying
                and not self.stopped_manually
            ):
                self._ended()

            self.state.update("playing", self.isPlaying)
            self.state.update("loaded", self.isLoaded)

            self.state.update(
                "pos_true",
                min(
                    self.state.get()["length"],
                    self.state.get()["pos"] + self.state.get()["pos_offset"],
                ),
            )

            self.state.update(
                "remaining",
                max(0, (self.state.get()["length"] -
                    self.state.get()["pos_true"])),
            )

    def _ping_times(self):

        UPDATES_FREQ_SECS = 0.2
        if (
            self.last_time_update is None
            or self.last_time_update + UPDATES_FREQ_SECS < time.time()
        ):
            self.last_time_update = time.time()
            self._retAll("POS:" + str(self.state.get()["pos_true"]))

    def _retAll(self, msg):
        if self.out_q:
            self.out_q.put("ALL:" + msg)

    def _retMsg(
        self, msg: Any, okay_str: bool = False, custom_prefix: Optional[str] = None
    ):
        # Make sure to add the message source back, so that it can be sent to the correct destination in the main server.
        if custom_prefix:
            response = custom_prefix
        else:
            response = "{}:{}:".format(self.last_msg_source, self.last_msg)
        if msg is True:
            response += "OKAY"
        elif isinstance(msg, str):
            if okay_str:
                response += "OKAY:" + msg
            else:
                response += "FAIL:" + msg
        else:
            response += "FAIL"

        if self.out_q:
            if "STATUS:" not in response:
                # Don't fill logs with status pushes, it's a mess.
                self.logger.log.debug(("Sending: {}".format(response)))
            self.out_q.put(response)
        else:
            self.logger.log.exception(
                "Message return Queue is missing!!!! Can't send message."
            )

    def _send_status(self):
        # TODO This is hacky
        self._retMsg(str(self.status), okay_str=True,
                     custom_prefix="ALL:STATUS:")

    def _fix_and_update_weights(self, plan):
        def _sort_weight(e: PlanItem):
            return e.weight

        before = []
        for item in plan:
            before += (item.weight, item.name)

        self.logger.log.debug("Weights before fixing:\n{}".format(before))

        plan.sort(key=_sort_weight)  # Sort into weighted order.

        sorted = []
        for item in plan:
            sorted += (item.weight, item.name)

        self.logger.log.debug("Weights after sorting:\n{}".format(sorted))

        for i in range(len(plan)):
            plan[i].weight = i  # Recorrect the weights on the channel.

        fixed = []
        for item in plan:
            fixed += (item.weight, item.name)

        self.logger.log.debug("Weights after sorting:\n{}".format(fixed))
        self.state.update("show_plan", plan)

    def __init__(
        self,
        channel: int,
        in_q: multiprocessing.Queue,
        out_q: multiprocessing.Queue,
        server_state: StateManager,
    ):

        process_title = "Player: Channel " + str(channel)
        setproctitle.setproctitle(process_title)
        multiprocessing.current_process().name = process_title

        self.running = True
        self.out_q = out_q

        self.logger = LoggingManager(
            "Player" + str(channel), debug=package.BETA)

        self.api = MyRadioAPI(self.logger, server_state)

        self.state = StateManager(
            "Player" + str(channel),
            self.logger,
            self.__default_state,
            self.__rate_limited_params,
        )

        self.state.update("start_time", datetime.now().timestamp())

        self.state.add_callback(self._send_status)

        self.state.update("channel", channel)
        self.state.update("tracklist_mode", server_state.get()[
                          "tracklist_mode"])
        self.state.update(
            "live", True
        )  # Channel is live until controller says it isn't.

        # Just in case there's any weights somehow messed up, let's fix them.
        plan_copy: List[PlanItem] = copy.copy(self.state.get()["show_plan"])
        self._fix_and_update_weights(plan_copy)

        loaded_state = copy.copy(self.state.state)

        if loaded_state["output"]:
            self.logger.log.info("Setting output to: " +
                                 str(loaded_state["output"]))
            self.output(loaded_state["output"])
        else:
            self.logger.log.info("Using default output device.")
            self.output()

        loaded_item = loaded_state["loaded_item"]
        if loaded_item:
            # No need to load on init, the output switch does this, as it would for regular output switching.
            # self.load(loaded_item.weight)

            # Load may jump to the cue point, as it would do on a regular load.
            # If we were at a different state before, we have to override it now.
            if loaded_state["pos_true"] != 0:
                self.logger.log.info(
                    "Seeking to pos_true: " + str(loaded_state["pos_true"])
                )
                self.seek(loaded_state["pos_true"])

            if loaded_state["playing"] is True:
                self.logger.log.info("Resuming playback on init.")
                # Use un-pause as we don't want to jump to a new position.
                self.unpause()
        else:
            self.logger.log.info("No file was previously loaded to resume.")

        try:
            while self.running:
                time.sleep(0.02)
                self._updateState()
                self._ping_times()
                try:
                    message = in_q.get_nowait()
                    source = message.split(":")[0]
                    if source not in VALID_MESSAGE_SOURCES:
                        self.last_msg_source = ""
                        self.last_msg = ""
                        self.logger.log.warn(
                            "Message from unknown sender source: {}".format(
                                source)
                        )
                        continue

                    self.last_msg_source = source
                    self.last_msg = message.split(":", 1)[1]

                    self.logger.log.debug(
                        "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
                            # Unpause, so we don't jump to 0, we play from the current pos.
                            "PLAY": lambda: self._retMsg(self.unpause()),
                            "PAUSE": lambda: self._retMsg(self.pause()),
                            "PLAYPAUSE": lambda: self._retMsg(
                                self.unpause() if not self.isPlaying else self.pause()
                            ),  # For the hardware controller.
                            "UNPAUSE": lambda: self._retMsg(self.unpause()),
                            "STOP": lambda: self._retMsg(
                                self.stop(user_initiated=True)
                            ),
                            "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
                            "GETPLAN": 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()),
                            "SETMARKER": lambda: self._retMsg(
                                self.set_marker(
                                    self.last_msg.split(":")[1],
                                    self.last_msg.split(":", 2)[2],
                                )
                            ),
                            "RESETPLAYED": lambda: self._retMsg(
                                self.set_played(
                                    weight=int(self.last_msg.split(":")[1]),
                                    played=False,
                                )
                            ),
                            "SETPLAYED": lambda: self._retMsg(
                                self.set_played(
                                    weight=int(self.last_msg.split(":")[1]), played=True
                                )
                            ),
                            "SETLIVE": lambda: self._retMsg(
                                self.set_live(
                                    self.last_msg.split(":")[1] == "True")
                            ),
                        }

                        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._retMsg(True)
                            self.running = False
                            continue

                        else:
                            self._retMsg("Unknown Command")
                    else:

                        if self.last_msg == "STATUS":
                            self._retMsg(self.status)
                        else:
                            self._retMsg(False)

        # 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("QUIT")
        del self.logger
        os._exit(0)


if __name__ == "__main__":
    raise Exception(
        "This BAPSicle Player is a subcomponenet, it will not run individually."
    )