725 lines
21 KiB
Python
725 lines
21 KiB
Python
# Standard library imports
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from __future__ import annotations
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import datetime as dt
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from time import sleep
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from typing import Optional
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# Third party imports
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# import line_profiler
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import numpy as np
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import pyqtgraph as pg # type: ignore
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from sqlalchemy.orm.session import Session
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import vlc # type: ignore
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# PyQt imports
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from PyQt6.QtCore import (
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pyqtSignal,
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QObject,
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QThread,
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)
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from pyqtgraph import PlotWidget
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from pyqtgraph.graphicsItems.PlotDataItem import PlotDataItem # type: ignore
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from pyqtgraph.graphicsItems.LinearRegionItem import LinearRegionItem # type: ignore
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# App imports
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from classes import ApplicationError, MusicMusterSignals
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from config import Config
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import helpers
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from log import log
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from models import PlaylistRows
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from vlcmanager import VLCManager
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# Define the VLC callback function type
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# import ctypes
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# import platform
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# VLC logging is very noisy so comment out unless needed
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# VLC_LOG_CB = ctypes.CFUNCTYPE(
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# None,
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# ctypes.c_void_p,
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# ctypes.c_int,
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# ctypes.c_void_p,
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# ctypes.c_char_p,
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# ctypes.c_void_p,
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# )
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# # Determine the correct C library for vsnprintf based on the platform
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# if platform.system() == "Windows":
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# libc = ctypes.CDLL("msvcrt")
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# elif platform.system() == "Linux":
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# libc = ctypes.CDLL("libc.so.6")
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# elif platform.system() == "Darwin": # macOS
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# libc = ctypes.CDLL("libc.dylib")
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# else:
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# raise OSError("Unsupported operating system")
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# # Define the vsnprintf function
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# libc.vsnprintf.argtypes = [
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# ctypes.c_char_p,
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# ctypes.c_size_t,
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# ctypes.c_char_p,
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# ctypes.c_void_p,
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# ]
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# libc.vsnprintf.restype = ctypes.c_int
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class _AddFadeCurve(QObject):
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"""
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Initialising a fade curve introduces a noticeable delay so carry out in
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a thread.
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"""
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finished = pyqtSignal()
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def __init__(
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self,
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rat: RowAndTrack,
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track_path: str,
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track_fade_at: int,
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track_silence_at: int,
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) -> None:
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super().__init__()
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self.rat = rat
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self.track_path = track_path
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self.track_fade_at = track_fade_at
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self.track_silence_at = track_silence_at
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def run(self) -> None:
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"""
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Create fade curve and add to PlaylistTrack object
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"""
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fc = _FadeCurve(self.track_path, self.track_fade_at, self.track_silence_at)
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if not fc:
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log.error(f"Failed to create FadeCurve for {self.track_path=}")
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else:
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self.rat.fade_graph = fc
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self.finished.emit()
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class _FadeCurve:
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GraphWidget: Optional[PlotWidget] = None
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def __init__(
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self, track_path: str, track_fade_at: int, track_silence_at: int
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) -> None:
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"""
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Set up fade graph array
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"""
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audio = helpers.get_audio_segment(track_path)
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if not audio:
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log.error(f"FadeCurve: could not get audio for {track_path=}")
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return None
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# Start point of curve is Config.FADE_CURVE_MS_BEFORE_FADE
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# milliseconds before fade starts to silence
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self.start_ms: int = max(
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0, track_fade_at - Config.FADE_CURVE_MS_BEFORE_FADE - 1
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)
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self.end_ms: int = track_silence_at
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audio_segment = audio[self.start_ms : self.end_ms]
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self.graph_array = np.array(audio_segment.get_array_of_samples())
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# Calculate the factor to map milliseconds of track to array
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self.ms_to_array_factor = len(self.graph_array) / (self.end_ms - self.start_ms)
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self.curve: Optional[PlotDataItem] = None
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self.region: Optional[LinearRegionItem] = None
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def clear(self) -> None:
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"""Clear the current graph"""
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if self.GraphWidget:
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self.GraphWidget.clear()
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def plot(self) -> None:
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if self.GraphWidget:
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self.curve = self.GraphWidget.plot(self.graph_array)
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if self.curve:
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self.curve.setPen(Config.FADE_CURVE_FOREGROUND)
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else:
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log.debug("_FadeCurve.plot: no curve")
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else:
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log.debug("_FadeCurve.plot: no GraphWidget")
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def tick(self, play_time: int) -> None:
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"""Update volume fade curve"""
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if not self.GraphWidget:
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return
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ms_of_graph = play_time - self.start_ms
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if ms_of_graph < 0:
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return
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if self.region is None:
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# Create the region now that we're into fade
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self.region = pg.LinearRegionItem([0, 0], bounds=[0, len(self.graph_array)])
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self.GraphWidget.addItem(self.region)
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# Update region position
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if self.region:
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self.region.setRegion([0, ms_of_graph * self.ms_to_array_factor])
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class _FadeTrack(QThread):
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finished = pyqtSignal()
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def __init__(self, player: vlc.MediaPlayer, fade_seconds: int) -> None:
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super().__init__()
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self.player = player
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self.fade_seconds = fade_seconds
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def run(self) -> None:
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"""
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Implementation of fading the player
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"""
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if not self.player:
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return
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# Reduce volume logarithmically
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total_steps = self.fade_seconds * Config.FADEOUT_STEPS_PER_SECOND
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if total_steps > 0:
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db_reduction_per_step = Config.FADEOUT_DB / total_steps
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reduction_factor_per_step = pow(10, (db_reduction_per_step / 20))
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volume = self.player.audio_get_volume()
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for i in range(1, total_steps + 1):
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self.player.audio_set_volume(
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int(volume * pow(reduction_factor_per_step, i))
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)
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sleep(1 / Config.FADEOUT_STEPS_PER_SECOND)
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self.finished.emit()
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# TODO can we move this into the _Music class?
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vlc_instance = VLCManager().vlc_instance
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class _Music:
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"""
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Manage the playing of music tracks
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"""
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def __init__(self, name: str) -> None:
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vlc_instance.set_user_agent(name, name)
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self.player: Optional[vlc.MediaPlayer] = None
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self.name = name
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self.max_volume: int = Config.VLC_VOLUME_DEFAULT
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self.start_dt: Optional[dt.datetime] = None
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# Set up logging
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# self._set_vlc_log()
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# VLC logging very noisy so comment out unless needed
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# @VLC_LOG_CB
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# def log_callback(data, level, ctx, fmt, args):
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# try:
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# # Create a ctypes string buffer to hold the formatted message
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# buf = ctypes.create_string_buffer(1024)
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# # Use vsnprintf to format the string with the va_list
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# libc.vsnprintf(buf, len(buf), fmt, args)
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# # Decode the formatted message
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# message = buf.value.decode("utf-8", errors="replace")
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# log.debug("VLC: " + message)
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# except Exception as e:
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# log.error(f"Error in VLC log callback: {e}")
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# def _set_vlc_log(self):
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# try:
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# vlc.libvlc_log_set(vlc_instance, self.log_callback, None)
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# log.debug("VLC logging set up successfully")
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# except Exception as e:
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# log.error(f"Failed to set up VLC logging: {e}")
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def adjust_by_ms(self, ms: int) -> None:
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"""Move player position by ms milliseconds"""
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if not self.player:
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return
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elapsed_ms = self.get_playtime()
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position = self.get_position()
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if not position:
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position = 0.0
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new_position = max(0.0, position + ((position * ms) / elapsed_ms))
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self.set_position(new_position)
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# Adjus start time so elapsed time calculations are correct
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if new_position == 0:
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self.start_dt = dt.datetime.now()
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else:
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if self.start_dt:
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self.start_dt -= dt.timedelta(milliseconds=ms)
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else:
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self.start_dt = dt.datetime.now() - dt.timedelta(milliseconds=ms)
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def fade(self, fade_seconds: int) -> None:
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"""
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Fade the currently playing track.
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The actual management of fading runs in its own thread so as not
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to hold up the UI during the fade.
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"""
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if not self.player:
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return
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if not self.player.get_position() > 0 and self.player.is_playing():
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return
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self.fader_worker = _FadeTrack(self.player, fade_seconds=fade_seconds)
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self.fader_worker.finished.connect(self.player.release)
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self.fader_worker.start()
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self.start_dt = None
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def get_playtime(self) -> int:
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"""
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Return number of milliseconds current track has been playing or
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zero if not playing. The vlc function get_time() only updates 3-4
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times a second; this function has much better resolution.
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"""
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if self.start_dt is None:
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return 0
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now = dt.datetime.now()
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elapsed_seconds = (now - self.start_dt).total_seconds()
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return int(elapsed_seconds * 1000)
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def get_position(self) -> Optional[float]:
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"""Return current position"""
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if not self.player:
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return None
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return self.player.get_position()
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def is_playing(self) -> bool:
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"""
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Return True if we're playing
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"""
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if not self.player:
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return False
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# There is a discrete time between starting playing a track and
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# player.is_playing() returning True, so assume playing if less
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# than Config.PLAY_SETTLE microseconds have passed since
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# starting play.
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return self.start_dt is not None and (
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self.player.is_playing()
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or (dt.datetime.now() - self.start_dt)
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< dt.timedelta(microseconds=Config.PLAY_SETTLE)
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)
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def play(
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self,
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path: str,
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start_time: dt.datetime,
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position: Optional[float] = None,
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) -> None:
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"""
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Start playing the track at path.
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Log and return if path not found.
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start_time ensures our version and our caller's version of
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the start time is the same
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"""
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log.debug(f"Music[{self.name}].play({path=}, {position=}")
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if helpers.file_is_unreadable(path):
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log.error(f"play({path}): path not readable")
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return None
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self.player = vlc.MediaPlayer(vlc_instance, path)
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if self.player is None:
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log.error(f"_Music:play: failed to create MediaPlayer ({path=})")
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helpers.show_warning(
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None, "Error creating MediaPlayer", f"Cannot play file ({path})"
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)
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return
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_ = self.player.play()
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self.set_volume(self.max_volume)
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if position:
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self.player.set_position(position)
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self.start_dt = start_time
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def set_position(self, position: float) -> None:
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"""
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Set player position
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"""
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if self.player:
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self.player.set_position(position)
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def set_volume(
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self, volume: Optional[int] = None, set_default: bool = True
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) -> None:
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"""Set maximum volume used for player"""
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if not self.player:
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return
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if set_default and volume:
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self.max_volume = volume
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if volume is None:
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volume = Config.VLC_VOLUME_DEFAULT
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self.player.audio_set_volume(volume)
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def stop(self) -> None:
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"""Immediately stop playing"""
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log.debug(f"Music[{self.name}].stop()")
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self.start_dt = None
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if not self.player:
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return
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if self.player.is_playing():
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self.player.stop()
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self.player.release()
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self.player = None
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class RowAndTrack:
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"""
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Object to manage playlist rows and tracks.
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"""
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def __init__(self, playlist_row: PlaylistRows) -> None:
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"""
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Initialises data structure.
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The passed PlaylistRows object will include a Tracks object if this
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row has a track.
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"""
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# Collect playlistrow data
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self.note = playlist_row.note
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self.played = playlist_row.played
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self.playlist_id = playlist_row.playlist_id
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self.playlistrow_id = playlist_row.id
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self.row_number = playlist_row.row_number
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self.track_id = playlist_row.track_id
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# Playlist display data
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self.row_fg: Optional[str] = None
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self.row_bg: Optional[str] = None
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self.note_fg: Optional[str] = None
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self.note_bg: Optional[str] = None
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# Collect track data if there's a track
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if playlist_row.track_id:
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self.artist = playlist_row.track.artist
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self.bitrate = playlist_row.track.bitrate
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self.duration = playlist_row.track.duration
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self.fade_at = playlist_row.track.fade_at
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self.intro = playlist_row.track.intro
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if playlist_row.track.playdates:
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self.lastplayed = max(
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[a.lastplayed for a in playlist_row.track.playdates]
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)
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else:
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self.lastplayed = Config.EPOCH
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self.path = playlist_row.track.path
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self.silence_at = playlist_row.track.silence_at
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self.start_gap = playlist_row.track.start_gap
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self.title = playlist_row.track.title
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else:
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self.artist = ""
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self.bitrate = 0
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self.duration = 0
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self.fade_at = 0
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self.intro = None
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self.lastplayed = Config.EPOCH
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self.path = ""
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self.silence_at = 0
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self.start_gap = 0
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self.title = ""
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# Track playing data
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self.end_of_track_signalled: bool = False
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self.end_time: Optional[dt.datetime] = None
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self.fade_graph: Optional[_FadeCurve] = None
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self.fade_graph_start_updates: Optional[dt.datetime] = None
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self.resume_marker: Optional[float] = 0.0
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self.forecast_end_time: Optional[dt.datetime] = None
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self.forecast_start_time: Optional[dt.datetime] = None
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self.start_time: Optional[dt.datetime] = None
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# Other object initialisation
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self.music = _Music(name=Config.VLC_MAIN_PLAYER_NAME)
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self.signals = MusicMusterSignals()
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def __repr__(self) -> str:
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return (
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f"<RowAndTrack(playlist_id={self.playlist_id}, "
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f"row_number={self.row_number}, "
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f"playlistrow_id={self.playlistrow_id}, "
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f"note={self.note}, track_id={self.track_id}>"
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)
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def check_for_end_of_track(self) -> None:
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"""
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Check whether track has ended. If so, emit track_ended_signal
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"""
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if self.start_time is None:
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return
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if self.end_of_track_signalled:
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return
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if self.music.is_playing():
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return
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self.start_time = None
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if self.fade_graph:
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self.fade_graph.clear()
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# Ensure that player is released
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self.music.fade(0)
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self.signals.track_ended_signal.emit()
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self.end_of_track_signalled = True
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def create_fade_graph(self) -> None:
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"""
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Initialise and add FadeCurve in a thread as it's slow
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"""
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self.fadecurve_thread = QThread()
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self.worker = _AddFadeCurve(
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self,
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track_path=self.path,
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track_fade_at=self.fade_at,
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track_silence_at=self.silence_at,
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)
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self.worker.moveToThread(self.fadecurve_thread)
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self.fadecurve_thread.started.connect(self.worker.run)
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self.worker.finished.connect(self.fadecurve_thread.quit)
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self.worker.finished.connect(self.worker.deleteLater)
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self.fadecurve_thread.finished.connect(self.fadecurve_thread.deleteLater)
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self.fadecurve_thread.start()
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def drop3db(self, enable: bool) -> None:
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"""
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If enable is true, drop output by 3db else restore to full volume
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"""
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if enable:
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self.music.set_volume(volume=Config.VLC_VOLUME_DROP3db, set_default=False)
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else:
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self.music.set_volume(volume=Config.VLC_VOLUME_DEFAULT, set_default=False)
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def fade(self, fade_seconds: int = Config.FADEOUT_SECONDS) -> None:
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"""Fade music"""
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self.resume_marker = self.music.get_position()
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self.music.fade(fade_seconds)
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self.signals.track_ended_signal.emit()
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def is_playing(self) -> bool:
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"""
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Return True if we're currently playing else False
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"""
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if self.start_time is None:
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return False
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return self.music.is_playing()
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def move_back(self, ms: int = Config.PREVIEW_BACK_MS) -> None:
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"""
|
|
Rewind player by ms milliseconds
|
|
"""
|
|
|
|
self.music.adjust_by_ms(ms * -1)
|
|
|
|
def move_forward(self, ms: int = Config.PREVIEW_ADVANCE_MS) -> None:
|
|
"""
|
|
Rewind player by ms milliseconds
|
|
"""
|
|
|
|
self.music.adjust_by_ms(ms)
|
|
|
|
def play(self, position: Optional[float] = None) -> None:
|
|
"""Play track"""
|
|
|
|
now = dt.datetime.now()
|
|
self.start_time = now
|
|
|
|
# Initialise player
|
|
self.music.play(self.path, start_time=now, position=position)
|
|
|
|
self.end_time = now + dt.timedelta(milliseconds=self.duration)
|
|
|
|
# Calculate time fade_graph should start updating
|
|
if self.fade_at:
|
|
update_graph_at_ms = max(
|
|
0, self.fade_at - Config.FADE_CURVE_MS_BEFORE_FADE - 1
|
|
)
|
|
self.fade_graph_start_updates = now + dt.timedelta(
|
|
milliseconds=update_graph_at_ms
|
|
)
|
|
|
|
def restart(self) -> None:
|
|
"""
|
|
Restart player
|
|
"""
|
|
|
|
self.music.adjust_by_ms(self.time_playing() * -1)
|
|
|
|
def set_forecast_start_time(
|
|
self, modified_rows: list[int], start: Optional[dt.datetime]
|
|
) -> Optional[dt.datetime]:
|
|
"""
|
|
Set forecast start time for this row
|
|
|
|
Update passed modified rows list if we changed the row.
|
|
|
|
Return new start time
|
|
"""
|
|
|
|
changed = False
|
|
|
|
if self.forecast_start_time != start:
|
|
self.forecast_start_time = start
|
|
changed = True
|
|
if start is None:
|
|
if self.forecast_end_time is not None:
|
|
self.forecast_end_time = None
|
|
changed = True
|
|
new_start_time = None
|
|
else:
|
|
end_time = start + dt.timedelta(milliseconds=self.duration)
|
|
new_start_time = end_time
|
|
if self.forecast_end_time != end_time:
|
|
self.forecast_end_time = end_time
|
|
changed = True
|
|
|
|
if changed and self.row_number not in modified_rows:
|
|
modified_rows.append(self.row_number)
|
|
|
|
return new_start_time
|
|
|
|
def stop(self, fade_seconds: int = 0) -> None:
|
|
"""
|
|
Stop this track playing
|
|
"""
|
|
|
|
self.resume_marker = self.music.get_position()
|
|
self.fade(fade_seconds)
|
|
|
|
# Reset fade graph
|
|
if self.fade_graph:
|
|
self.fade_graph.clear()
|
|
|
|
def time_playing(self) -> int:
|
|
"""
|
|
Return time track has been playing in milliseconds, zero if not playing
|
|
"""
|
|
|
|
if self.start_time is None:
|
|
return 0
|
|
|
|
return self.music.get_playtime()
|
|
|
|
def time_remaining_intro(self) -> int:
|
|
"""
|
|
Return milliseconds of intro remaining. Return 0 if no intro time in track
|
|
record or if intro has finished.
|
|
"""
|
|
|
|
if not self.intro:
|
|
return 0
|
|
|
|
return max(0, self.intro - self.time_playing())
|
|
|
|
def time_to_fade(self) -> int:
|
|
"""
|
|
Return milliseconds until fade time. Return zero if we're not playing.
|
|
"""
|
|
|
|
if self.start_time is None:
|
|
return 0
|
|
|
|
return self.fade_at - self.time_playing()
|
|
|
|
def time_to_silence(self) -> int:
|
|
"""
|
|
Return milliseconds until silent. Return zero if we're not playing.
|
|
"""
|
|
|
|
if self.start_time is None:
|
|
return 0
|
|
|
|
return self.silence_at - self.time_playing()
|
|
|
|
def update_fade_graph(self) -> None:
|
|
"""
|
|
Update fade graph
|
|
"""
|
|
|
|
if (
|
|
not self.is_playing()
|
|
or not self.fade_graph_start_updates
|
|
or not self.fade_graph
|
|
):
|
|
return
|
|
|
|
now = dt.datetime.now()
|
|
|
|
if self.fade_graph_start_updates > now:
|
|
return
|
|
|
|
self.fade_graph.tick(self.time_playing())
|
|
|
|
def update_playlist_and_row(self, session: Session) -> None:
|
|
"""
|
|
Update local playlist_id and row_number from playlistrow_id
|
|
"""
|
|
|
|
plr = session.get(PlaylistRows, self.playlistrow_id)
|
|
if not plr:
|
|
raise ApplicationError(f"(Can't retrieve PlaylistRows entry, {self=}")
|
|
self.playlist_id = plr.playlist_id
|
|
self.row_number = plr.row_number
|
|
|
|
|
|
class TrackSequence:
|
|
next: Optional[RowAndTrack] = None
|
|
current: Optional[RowAndTrack] = None
|
|
previous: Optional[RowAndTrack] = None
|
|
|
|
def set_next(self, rat: Optional[RowAndTrack]) -> None:
|
|
"""
|
|
Set the 'next' track to be passed rat. Clear
|
|
any previous next track. If passed rat is None
|
|
just clear existing next track.
|
|
"""
|
|
|
|
# Clear any existing fade graph
|
|
if self.next and self.next.fade_graph:
|
|
self.next.fade_graph.clear()
|
|
|
|
if rat is None:
|
|
self.next = None
|
|
else:
|
|
self.next = rat
|
|
self.next.create_fade_graph()
|
|
|
|
|
|
track_sequence = TrackSequence()
|