-
Notifications
You must be signed in to change notification settings - Fork 0
/
player.py
194 lines (150 loc) · 5.75 KB
/
player.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
# -*- coding: utf-8 -*-
from typing import List
import numpy as np
import cv2
from qtpy.QtWidgets import (
QPushButton, QLabel, QWidget, QSlider,
QGraphicsView, QGraphicsScene,
QGraphicsPixmapItem, QStyle
)
from qtpy.QtCore import QObject, Qt, QPoint, QTimer
from qtpy.QtCore import Slot
from qtpy.QtCore import Signal
from qtpy.QtGui import QImage, QPixmap, QPainter
from utils import hbox, vbox, get_standard_icon
class VideoPlayerWidget(QWidget):
def __init__(self, **kwargs):
super(VideoPlayerWidget, self).__init__(**kwargs)
self._video = None
self._playing = False
self._moving_seekbar = False
self.view = GraphicsView()
self.play_button = QPushButton()
self.play_button.setIcon(
get_standard_icon(QStyle.SP_MediaPlay)
)
self.play_button.clicked.connect(
self.on_play_button_clicked
)
self.seekbar = QSlider(Qt.Horizontal)
self.seekbar.setMinimum(0)
self.seekbar.setMaximum(0)
self.seekbar.sliderPressed.connect(self.on_seekbar_sliderPressed)
self.seekbar.sliderMoved.connect(self.on_seekbar_sliderMoved)
self.seekbar.sliderReleased.connect(self.on_seekbar_sliderReleased)
self.seekbar.valueChanged.connect(self.on_seekbar_valueChanged)
self.nframes_label = QLabel('----- / -----')
self.update_timer = QTimer(self)
self.update_timer.timeout.connect(self.fetch_frame)
layout = vbox([
self.view,
hbox([self.play_button, self.seekbar, self.nframes_label])
])
self.setLayout(layout)
def open_video(self, src_path):
self._video = cv2.VideoCapture(src_path)
if self.video_is_opened():
ret, frame = self._video.read()
self.view.update_image(frame)
self.seekbar.setMaximum(
self._video.get(cv2.CAP_PROP_FRAME_COUNT)
)
return True
else:
return False
def video_is_opened(self):
return self._video is not None and self._video.isOpened()
def start_video(self):
self._playing = True
self.play_button.setIcon(
get_standard_icon(QStyle.SP_MediaPause)
)
fps = self._video.get(cv2.CAP_PROP_FPS)
self.update_timer.start(1000. / fps)
def stop_video(self):
self._playing = False
self.play_button.setIcon(
get_standard_icon(QStyle.SP_MediaPlay)
)
self.update_timer.stop()
def fetch_frame(self):
if self._moving_seekbar:
return
ret, frame = self._video.read()
if not ret:
self.stop_video()
return
self.view.update_image(frame)
pos = self._video.get(cv2.CAP_PROP_POS_FRAMES)
self.seekbar.setValue(pos)
def on_play_button_clicked(self):
if not self.video_is_opened():
return
if self._playing:
self.stop_video()
else:
self.start_video()
def on_seekbar_sliderPressed(self):
if not self.video_is_opened():
return
self._moving_seekbar = True
def on_seekbar_sliderMoved(self):
pass
def on_seekbar_sliderReleased(self):
if not self.video_is_opened():
return
self._moving_seekbar = False
pos = self.seekbar.value()
self._video.set(cv2.CAP_PROP_POS_FRAMES, pos)
self.fetch_frame()
def on_seekbar_valueChanged(self):
curr_pos = self.seekbar.value()
nframes = self.seekbar.maximum()
self.nframes_label.setText(f'{curr_pos:05d} / {nframes:05d}')
class GraphicsView(QGraphicsView):
def __init__(self, **kwargs):
super(GraphicsView, self).__init__(**kwargs)
self._scene = QGraphicsScene(parent=self)
self.current_image = QGraphicsPixmapItem()
self._scene.addItem(self.current_image)
self.setScene(self._scene)
self.fitInView(self._scene.sceneRect(), Qt.KeepAspectRatio)
self.setTransformationAnchor(QGraphicsView.AnchorUnderMouse)
self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOn)
self.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOn)
self.setMouseTracking(True)
self.setRenderHint(QPainter.Antialiasing)
def update_image(self, img: np.ndarray):
rgb_image = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
h, w, ch = rgb_image.shape
bytes_per_line = ch * w
qimg = QImage(rgb_image.data, w, h,
bytes_per_line, QImage.Format_RGB888)
pixmap = QPixmap.fromImage(qimg)
self.current_image.setPixmap(pixmap)
self._scene.setSceneRect(0, 0, w, h)
self.fitInView(self._scene.sceneRect(), Qt.KeepAspectRatio)
def resizeEvent(self, e):
self.fitInView(self._scene.sceneRect(), Qt.KeepAspectRatio)
def wheelEvent(self, e):
if e.angleDelta().y() > 0:
self.scale(1.25, 1.25)
elif e.angleDelta().y() < 0:
self.scale(0.85, 0.85)
def mousePressEvent(self, e):
# シーン上のマウス位置を取得する
pos = self.mapToScene(e.pos())
if e.button() == Qt.LeftButton:
if e.modifiers() == Qt.NoModifier:
pass
elif e.modifiers() == Qt.AltModifier:
self.setDragMode(QGraphicsView.ScrollHandDrag)
QGraphicsView.mousePressEvent(self, e)
def mouseReleaseEvent(self, e):
QGraphicsView.mouseReleaseEvent(self, e)
if e.button() == Qt.LeftButton:
self.setDragMode(QGraphicsView.NoDrag)
def calc_offset(self, p: QPoint):
offset_x = p.x() - int(self.viewport().width() / 2)
offset_y = p.y() - int(self.viewport().height() / 2)
return QPoint(offset_x, offset_y)