pax
c4061b0d20
The seek slider snapped visually backward after a click for the first
~tens to hundreds of ms — long enough to be obvious. Race trace:
user clicks slider at target T
→ _ClickSeekSlider.mousePressEvent fires
→ setValue(T) lands the visual at the click position
→ clicked_position emits → _seek dispatches mpv.seek(T) async
→ mpv processes the seek on its own thread
meanwhile the 100ms _poll timer keeps firing
→ reads mpv.time_pos (still the OLD position, mpv hasn't caught up)
→ calls self._seek_slider.setValue(pos_ms)
→ slider visually snaps backward to the pre-seek position
→ mpv finishes seeking, next poll tick writes the new position
→ slider jumps forward to settle near T
The isSliderDown() guard at the existing setValue site (around line
425) only suppresses writebacks during a *drag* — fast clicks never
trigger isSliderDown, so the guard didn't help here.
Fix: pin the slider to the user's target throughout a 500ms post-seek
window. Mirror the existing _eof_ignore_until pattern (stale-eof
suppression in play_file → _on_eof_reached) — it's the same shape:
"after this dispatch, ignore poll-driven writebacks for N ms because
mpv hasn't caught up yet."
- _seek now records _seek_target_ms and arms _seek_pending_until
- _poll forces _seek_slider.setValue(_seek_target_ms) on every tick
inside the window, instead of mpv's lagging time_pos
- After the window expires, normal mpv-driven writes resume
Pin window is 500ms (vs the eof window's 250ms) because network and
streaming seeks take noticeably longer than local-cache seeks. Inside
the window the slider is forced to the target every tick, so mpv lag
is invisible no matter how long it takes within the window.
First attempt used a smaller 250ms window with a "close enough"
early-release condition (release suppression once mpv reports a
position within 250ms of the target). That still showed minor
track-back because the "close enough" threshold permitted writing
back a position slightly less than the target, producing a small
visible jump. The pin-to-target approach is robust against any
mpv interim position.
The time_label keeps updating to mpv's actual position throughout —
only the slider value is pinned, so the user can still see the
seek progressing in the time text.
Verified manually: clicks at start / middle / end of a video slider
all hold position cleanly. Drag still works (the isSliderDown path
is untouched). Normal playback advances smoothly (the pin window
only affects the post-seek window, not steady-state playback).
516 lines
21 KiB
Python
516 lines
21 KiB
Python
"""mpv-backed video player widget with transport controls."""
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from __future__ import annotations
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from PySide6.QtCore import Qt, QTimer, Signal, Property
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from PySide6.QtGui import QColor
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from PySide6.QtWidgets import (
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QWidget, QVBoxLayout, QHBoxLayout, QLabel, QPushButton, QSlider, QStyle,
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)
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import mpv as mpvlib
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from .mpv_gl import _MpvGLWidget
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class _ClickSeekSlider(QSlider):
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"""Slider that jumps to the clicked position instead of page-stepping."""
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clicked_position = Signal(int)
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def mousePressEvent(self, event):
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if event.button() == Qt.MouseButton.LeftButton:
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val = QStyle.sliderValueFromPosition(
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self.minimum(), self.maximum(), int(event.position().x()), self.width()
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)
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self.setValue(val)
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self.clicked_position.emit(val)
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super().mousePressEvent(event)
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# -- Video Player (mpv backend via OpenGL render API) --
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class VideoPlayer(QWidget):
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"""Video player with transport controls, powered by mpv."""
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play_next = Signal() # emitted when video ends in "Next" mode
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media_ready = Signal() # emitted when media is loaded and duration is known
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video_size = Signal(int, int) # (width, height) emitted when video dimensions are known
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# QSS-controllable letterbox / pillarbox color. mpv paints the area
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# around the video frame in this color instead of the default black,
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# so portrait videos in a landscape preview slot (or vice versa) blend
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# into the panel theme instead of sitting in a hard black box.
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# Set via `VideoPlayer { qproperty-letterboxColor: ${bg}; }` in a theme.
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# The class default below is just a fallback; __init__ replaces it
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# with the current palette's Window color so systems without a custom
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# QSS (e.g. Windows dark/light mode driven entirely by QPalette) get
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# a letterbox that automatically matches the OS background.
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_letterbox_color = QColor("#000000")
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def _get_letterbox_color(self): return self._letterbox_color
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def _set_letterbox_color(self, c):
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self._letterbox_color = QColor(c) if isinstance(c, str) else c
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self._apply_letterbox_color()
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letterboxColor = Property(QColor, _get_letterbox_color, _set_letterbox_color)
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def _apply_letterbox_color(self) -> None:
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"""Push the current letterbox color into mpv. No-op if mpv hasn't
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been initialized yet — _ensure_mpv() calls this after creating the
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instance so a QSS-set property still takes effect on first use."""
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if self._mpv is None:
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return
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try:
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self._mpv['background'] = 'color'
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self._mpv['background-color'] = self._letterbox_color.name()
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except Exception:
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pass
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def __init__(self, parent: QWidget | None = None, embed_controls: bool = True) -> None:
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"""
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embed_controls: When True (default), the transport controls bar is
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added to this VideoPlayer's own layout below the video — used by the
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popout window which then reparents the bar to its overlay layer.
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When False, the controls bar is constructed but never inserted into
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any layout, leaving the embedded preview a clean video surface with
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no transport controls visible. Use the popout for playback control.
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"""
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super().__init__(parent)
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# Initialize the letterbox color from the current palette's Window
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# role so dark/light mode (or any system without a custom QSS)
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# gets a sensible default that matches the surrounding panel.
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# The QSS qproperty-letterboxColor on the bundled themes still
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# overrides this — Qt calls the setter during widget polish,
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# which happens AFTER __init__ when the widget is shown.
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from PySide6.QtGui import QPalette
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self._letterbox_color = self.palette().color(QPalette.ColorRole.Window)
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layout = QVBoxLayout(self)
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layout.setContentsMargins(0, 0, 0, 0)
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layout.setSpacing(0)
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# Video surface — mpv renders via OpenGL render API
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self._gl_widget = _MpvGLWidget()
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layout.addWidget(self._gl_widget, stretch=1)
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# mpv reference (set by _ensure_mpv)
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self._mpv: mpvlib.MPV | None = None
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# Controls bar — in preview panel this sits in the layout normally;
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# in slideshow mode, FullscreenPreview reparents it as a floating overlay.
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self._controls_bar = QWidget(self)
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controls = QHBoxLayout(self._controls_bar)
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controls.setContentsMargins(4, 2, 4, 2)
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# Compact-padding override matches the top preview toolbar so the
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# bottom controls bar reads as part of the same panel rather than
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# as a stamped-in overlay. Bundled themes' default `padding: 5px 12px`
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# is too wide for short labels in narrow button slots.
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_ctrl_btn_style = "padding: 2px 6px;"
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self._play_btn = QPushButton("Play")
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self._play_btn.setMaximumWidth(65)
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self._play_btn.setStyleSheet(_ctrl_btn_style)
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self._play_btn.clicked.connect(self._toggle_play)
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controls.addWidget(self._play_btn)
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self._time_label = QLabel("0:00")
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self._time_label.setMaximumWidth(45)
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controls.addWidget(self._time_label)
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self._seek_slider = _ClickSeekSlider(Qt.Orientation.Horizontal)
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self._seek_slider.setRange(0, 0)
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self._seek_slider.sliderMoved.connect(self._seek)
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self._seek_slider.clicked_position.connect(self._seek)
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controls.addWidget(self._seek_slider, stretch=1)
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self._duration_label = QLabel("0:00")
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self._duration_label.setMaximumWidth(45)
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controls.addWidget(self._duration_label)
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self._vol_slider = QSlider(Qt.Orientation.Horizontal)
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self._vol_slider.setRange(0, 100)
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self._vol_slider.setValue(50)
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self._vol_slider.setFixedWidth(60)
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self._vol_slider.valueChanged.connect(self._set_volume)
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controls.addWidget(self._vol_slider)
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self._mute_btn = QPushButton("Mute")
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self._mute_btn.setMaximumWidth(80)
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self._mute_btn.setStyleSheet(_ctrl_btn_style)
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self._mute_btn.clicked.connect(self._toggle_mute)
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controls.addWidget(self._mute_btn)
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self._autoplay = True
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self._autoplay_btn = QPushButton("Auto")
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self._autoplay_btn.setMaximumWidth(70)
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self._autoplay_btn.setStyleSheet(_ctrl_btn_style)
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self._autoplay_btn.setCheckable(True)
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self._autoplay_btn.setChecked(True)
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self._autoplay_btn.setToolTip("Auto-play videos when selected")
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self._autoplay_btn.clicked.connect(self._toggle_autoplay)
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self._autoplay_btn.hide()
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controls.addWidget(self._autoplay_btn)
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self._loop_state = 0 # 0=Loop, 1=Once, 2=Next
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self._loop_btn = QPushButton("Loop")
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self._loop_btn.setMaximumWidth(60)
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self._loop_btn.setStyleSheet(_ctrl_btn_style)
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self._loop_btn.setToolTip("Loop: repeat / Once: stop at end / Next: advance")
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self._loop_btn.clicked.connect(self._cycle_loop)
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controls.addWidget(self._loop_btn)
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# NO styleSheet here. The popout (FullscreenPreview) re-applies its
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# own `_slideshow_controls` overlay styling after reparenting the
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# bar to its central widget — see FullscreenPreview.__init__ — so
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# the popout still gets the floating dark-translucent look. The
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# embedded preview leaves the bar unstyled so it inherits the
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# panel theme and visually matches the Bookmark/Save/BL Tag bar
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# at the top of the panel rather than looking like a stamped-in
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# overlay box.
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if embed_controls:
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layout.addWidget(self._controls_bar)
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self._eof_pending = False
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# Stale-eof suppression window. mpv emits `eof-reached=True`
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# whenever a file ends — including via `command('stop')` —
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# and the observer fires asynchronously on mpv's event thread.
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# When set_media swaps to a new file, the previous file's stop
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# generates an eof event that can race with `play_file`'s
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# `_eof_pending = False` reset and arrive AFTER it, sticking
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# the bool back to True. The next `_poll` then runs
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# `_handle_eof` and emits `play_next` in Loop=Next mode →
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# auto-advance past the post the user wanted → SKIP.
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#
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# Fix: ignore eof events for `_eof_ignore_window_secs` after
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# each `play_file` call. The race is single-digit ms, so
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# 250ms is comfortably wide for the suppression and narrow
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# enough not to mask a real EOF on the shortest possible
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# videos (booru video clips are always >= 1s).
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self._eof_ignore_until: float = 0.0
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self._eof_ignore_window_secs: float = 0.25
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# Seek-pending pin window — covers the user-clicked-the-seek-slider
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# race. The flow: user clicks slider → _ClickSeekSlider.setValue
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# (visual jumps to click position) → clicked_position emits →
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# _seek dispatches mpv.seek (async on mpv's thread). Meanwhile
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# the 100ms _poll tick reads mpv.time_pos (still the OLD
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# position) and writes it back to the slider via setValue,
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# snapping the slider visually backward until mpv catches up.
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# The isSliderDown guard at line ~425 only suppresses the
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# writeback during a drag — fast clicks don't trigger
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# isSliderDown. Defence: instead of just *suppressing* the
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# writeback during the window, we *pin* the slider to the user's
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# target position on every poll tick that lands inside the
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# window. That way mpv's lag — however long it is up to the
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# window length — is invisible. After the window expires,
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# normal mpv-driven slider updates resume.
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#
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# Window is wider than the eof one (500ms vs 250ms) because
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# network/streaming seeks can take longer than the local-cache
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# seeks the eof window was sized for.
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self._seek_pending_until: float = 0.0
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self._seek_target_ms: int = 0
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self._seek_pin_window_secs: float = 0.5
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# Polling timer for position/duration/pause/eof state
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self._poll_timer = QTimer(self)
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self._poll_timer.setInterval(100)
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self._poll_timer.timeout.connect(self._poll)
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# Pending values from mpv observers (written from mpv thread)
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self._pending_duration: float | None = None
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self._media_ready_fired = False
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self._current_file: str | None = None
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# Last reported source video size — used to dedupe video-params
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# observer firings so widget-driven re-emissions don't trigger
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# repeated _fit_to_content calls (which would loop forever).
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self._last_video_size: tuple[int, int] | None = None
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def _ensure_mpv(self) -> mpvlib.MPV:
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"""Set up mpv callbacks on first use. MPV instance is pre-created."""
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if self._mpv is not None:
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return self._mpv
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self._mpv = self._gl_widget._mpv
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self._mpv['loop-file'] = 'inf' # default to loop mode
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self._mpv.volume = self._vol_slider.value()
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self._mpv.observe_property('duration', self._on_duration_change)
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self._mpv.observe_property('eof-reached', self._on_eof_reached)
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self._mpv.observe_property('video-params', self._on_video_params)
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self._pending_video_size: tuple[int, int] | None = None
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# Push any QSS-set letterbox color into mpv now that the instance
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# exists. The qproperty-letterboxColor setter is a no-op if mpv
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# hasn't been initialized yet, so we have to (re)apply on init.
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self._apply_letterbox_color()
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return self._mpv
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# -- Public API (used by app.py for state sync) --
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@property
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def volume(self) -> int:
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return self._vol_slider.value()
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@volume.setter
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def volume(self, val: int) -> None:
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self._vol_slider.setValue(val)
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@property
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def is_muted(self) -> bool:
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if self._mpv:
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return bool(self._mpv.mute)
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return False
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@is_muted.setter
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def is_muted(self, val: bool) -> None:
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if self._mpv:
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self._mpv.mute = val
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self._mute_btn.setText("Unmute" if val else "Mute")
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@property
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def autoplay(self) -> bool:
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return self._autoplay
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@autoplay.setter
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def autoplay(self, val: bool) -> None:
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self._autoplay = val
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self._autoplay_btn.setChecked(val)
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self._autoplay_btn.setText("Autoplay" if val else "Manual")
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@property
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def loop_state(self) -> int:
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return self._loop_state
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@loop_state.setter
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def loop_state(self, val: int) -> None:
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self._loop_state = val
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labels = ["Loop", "Once", "Next"]
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self._loop_btn.setText(labels[val])
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self._autoplay_btn.setVisible(val == 2)
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self._apply_loop_to_mpv()
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def get_position_ms(self) -> int:
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if self._mpv and self._mpv.time_pos is not None:
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return int(self._mpv.time_pos * 1000)
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return 0
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def seek_to_ms(self, ms: int) -> None:
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if self._mpv:
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self._mpv.seek(ms / 1000.0, 'absolute+exact')
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def play_file(self, path: str, info: str = "") -> None:
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"""Play a file from a local path OR a remote http(s) URL.
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URL playback is the fast path for uncached videos: rather than
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waiting for `download_image` to finish writing the entire file
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to disk before mpv touches it, the load flow hands mpv the
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remote URL and lets mpv stream + buffer + render the first
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frame in parallel with the cache-populating download. mpv's
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first frame typically lands in 1-2s instead of waiting for
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the full multi-MB transfer.
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For URL paths we set the `referrer` per-file option from the
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booru's hostname so CDNs that gate downloads on Referer don't
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reject mpv's request — same logic our own httpx client uses
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in `cache._referer_for`. python-mpv's `loadfile()` accepts
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per-file `**options` kwargs that become `--key=value` overrides
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for the duration of that file.
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"""
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m = self._ensure_mpv()
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self._gl_widget.ensure_gl_init()
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self._current_file = path
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self._media_ready_fired = False
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self._pending_duration = None
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self._eof_pending = False
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# Open the stale-eof suppression window. Any eof-reached event
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# arriving from mpv's event thread within the next 250ms is
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# treated as belonging to the previous file's stop and
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# ignored — see the long comment at __init__'s
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# `_eof_ignore_until` definition for the race trace.
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import time as _time
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self._eof_ignore_until = _time.monotonic() + self._eof_ignore_window_secs
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self._last_video_size = None # reset dedupe so new file fires a fit
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self._apply_loop_to_mpv()
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if path.startswith(("http://", "https://")):
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from urllib.parse import urlparse
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from ...core.cache import _referer_for
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referer = _referer_for(urlparse(path))
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m.loadfile(path, "replace", referrer=referer)
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else:
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m.loadfile(path)
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if self._autoplay:
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m.pause = False
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else:
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m.pause = True
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self._play_btn.setText("Pause" if not m.pause else "Play")
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self._poll_timer.start()
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def stop(self) -> None:
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self._poll_timer.stop()
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if self._mpv:
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self._mpv.command('stop')
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self._time_label.setText("0:00")
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self._duration_label.setText("0:00")
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self._seek_slider.setRange(0, 0)
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self._play_btn.setText("Play")
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def pause(self) -> None:
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if self._mpv:
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self._mpv.pause = True
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self._play_btn.setText("Play")
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def resume(self) -> None:
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if self._mpv:
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self._mpv.pause = False
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self._play_btn.setText("Pause")
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# -- Internal controls --
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def _toggle_play(self) -> None:
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if not self._mpv:
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return
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self._mpv.pause = not self._mpv.pause
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self._play_btn.setText("Play" if self._mpv.pause else "Pause")
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def _toggle_autoplay(self, checked: bool = True) -> None:
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self._autoplay = self._autoplay_btn.isChecked()
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self._autoplay_btn.setText("Autoplay" if self._autoplay else "Manual")
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def _cycle_loop(self) -> None:
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self.loop_state = (self._loop_state + 1) % 3
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def _apply_loop_to_mpv(self) -> None:
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if not self._mpv:
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return
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if self._loop_state == 0: # Loop
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self._mpv['loop-file'] = 'inf'
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else: # Once or Next
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self._mpv['loop-file'] = 'no'
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def _seek(self, pos: int) -> None:
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"""Seek to position in milliseconds (from slider)."""
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if self._mpv:
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import time as _time
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self._seek_target_ms = pos
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self._seek_pending_until = _time.monotonic() + self._seek_pin_window_secs
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self._mpv.seek(pos / 1000.0, 'absolute')
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def _seek_relative(self, ms: int) -> None:
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if self._mpv:
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self._mpv.seek(ms / 1000.0, 'relative+exact')
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def _set_volume(self, val: int) -> None:
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if self._mpv:
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self._mpv.volume = val
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def _toggle_mute(self) -> None:
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if self._mpv:
|
|
self._mpv.mute = not self._mpv.mute
|
|
self._mute_btn.setText("Unmute" if self._mpv.mute else "Mute")
|
|
|
|
# -- mpv callbacks (called from mpv thread) --
|
|
|
|
def _on_video_params(self, _name: str, value) -> None:
|
|
"""Called from mpv thread when video dimensions become known."""
|
|
if isinstance(value, dict) and value.get('w') and value.get('h'):
|
|
new_size = (value['w'], value['h'])
|
|
# mpv re-fires video-params on output-area changes too. Dedupe
|
|
# against the source dimensions we last reported so resizing the
|
|
# popout doesn't kick off a fit→resize→fit feedback loop.
|
|
if new_size != self._last_video_size:
|
|
self._last_video_size = new_size
|
|
self._pending_video_size = new_size
|
|
|
|
def _on_eof_reached(self, _name: str, value) -> None:
|
|
"""Called from mpv thread when eof-reached changes.
|
|
|
|
Suppresses eof events that arrive within the post-play_file
|
|
ignore window — those are stale events from the previous
|
|
file's stop and would otherwise race the `_eof_pending=False`
|
|
reset and trigger a spurious play_next auto-advance.
|
|
"""
|
|
if value is True:
|
|
import time as _time
|
|
if _time.monotonic() < self._eof_ignore_until:
|
|
# Stale eof from a previous file's stop. Drop it.
|
|
return
|
|
self._eof_pending = True
|
|
|
|
def _on_duration_change(self, _name: str, value) -> None:
|
|
if value is not None and value > 0:
|
|
self._pending_duration = value
|
|
|
|
# -- Main-thread polling --
|
|
|
|
def _poll(self) -> None:
|
|
if not self._mpv:
|
|
return
|
|
# Position
|
|
pos = self._mpv.time_pos
|
|
if pos is not None:
|
|
pos_ms = int(pos * 1000)
|
|
if not self._seek_slider.isSliderDown():
|
|
# Pin the slider to the user's target while a seek is in
|
|
# flight — mpv processes seek async, and any poll tick
|
|
# that fires before mpv reports the new position would
|
|
# otherwise snap the slider backward. Force the value to
|
|
# the target every tick inside the pin window; after the
|
|
# window expires, mpv has caught up and normal writes
|
|
# resume. See __init__'s `_seek_pin_window_secs` block
|
|
# for the race trace.
|
|
import time as _time
|
|
if _time.monotonic() < self._seek_pending_until:
|
|
self._seek_slider.setValue(self._seek_target_ms)
|
|
else:
|
|
self._seek_slider.setValue(pos_ms)
|
|
self._time_label.setText(self._fmt(pos_ms))
|
|
|
|
# Duration (from observer)
|
|
dur = self._pending_duration
|
|
if dur is not None:
|
|
dur_ms = int(dur * 1000)
|
|
if self._seek_slider.maximum() != dur_ms:
|
|
self._seek_slider.setRange(0, dur_ms)
|
|
self._duration_label.setText(self._fmt(dur_ms))
|
|
if not self._media_ready_fired:
|
|
self._media_ready_fired = True
|
|
self.media_ready.emit()
|
|
|
|
# Pause state
|
|
paused = self._mpv.pause
|
|
expected_text = "Play" if paused else "Pause"
|
|
if self._play_btn.text() != expected_text:
|
|
self._play_btn.setText(expected_text)
|
|
|
|
# Video size (set by observer on mpv thread, emitted here on main thread)
|
|
if self._pending_video_size is not None:
|
|
w, h = self._pending_video_size
|
|
self._pending_video_size = None
|
|
self.video_size.emit(w, h)
|
|
|
|
# EOF (set by observer on mpv thread, handled here on main thread)
|
|
if self._eof_pending:
|
|
self._handle_eof()
|
|
|
|
def _handle_eof(self) -> None:
|
|
"""Handle end-of-file on the main thread."""
|
|
if not self._eof_pending:
|
|
return
|
|
self._eof_pending = False
|
|
if self._loop_state == 1: # Once
|
|
self.pause()
|
|
elif self._loop_state == 2: # Next
|
|
self.pause()
|
|
self.play_next.emit()
|
|
|
|
@staticmethod
|
|
def _fmt(ms: int) -> str:
|
|
s = ms // 1000
|
|
m = s // 60
|
|
return f"{m}:{s % 60:02d}"
|
|
|
|
def destroy(self, *args, **kwargs) -> None:
|
|
self._poll_timer.stop()
|
|
self._gl_widget.cleanup()
|
|
self._mpv = None
|
|
super().destroy(*args, **kwargs)
|